CN116158037A - Method and apparatus for reporting SL HARQ feedback to a base station in NR V2X - Google Patents

Abstract

A method for performing wireless communication by a first device and a device supporting the same may be provided. The method may comprise the steps of: receiving information on Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station from the base station; transmitting first side link control information (SCI) to a second device over a physical side link control channel (PSCCH); transmitting a second SCI and a medium access control protocol data unit (MAC PDU) to a second device over a physical side link shared channel (PSSCH) associated with a PSCCH; determining physical side chain feedback channel (PSFCH) resources based on an index of a subchannel and an index of a slot related to the PSSCH; and transmitting SL HARQ feedback for the MAC PDU to the base station based on the UL resource. The minimum time gap between the PSFCH resource and the UL resource may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of the UL BWP, wherein N may be determined based on a minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and X may be determined based on information related to priority.

Description

Method and apparatus for reporting SL HARQ feedback to a base station in NR V2X

Technical Field

The present disclosure relates to a wireless communication system.

Background

Side Link (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved node B (eNB). SL communication is being considered as a solution for eNB overhead due to the rapid growth of data traffic. V2X (vehicle to everything) refers to a communication technology in which vehicles are used to exchange information with other vehicles, pedestrians, objects equipped with infrastructure, and the like. V2X can be classified into four types such as V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication may be provided through a PC5 interface and/or Uu interface.

Furthermore, as more and more communication devices require larger communication capacity, the need for enhanced mobile broadband communication relative to conventional Radio Access Technologies (RATs) is rising. Thus, communication system designs for UEs or services that are sensitive to reliability and delay have also been discussed. Also, next generation radio access technologies based on enhanced mobile broadband communication, large-scale Machine Type Communication (MTC), ultra-reliable low latency communication (URLLC), etc. may be referred to as new RATs (radio access technologies) or NR (new radios). Herein, NR may also support vehicle-to-everything (V2X) communication.

Fig. 1 is a diagram for describing NR based V2X communication compared to V2X communication based on RAT used before NR. The embodiment of fig. 1 may be combined with various embodiments of the present disclosure.

Regarding V2X communication, when discussing RATs used before NR, a scheme of providing security services based on V2X messages such as BSM (basic security message), CAM (cooperative awareness message), and DENM (distributed environment notification message) is focused. The V2X message may include location information, dynamic information, attribute information, and the like. For example, the UE may send a periodic message type CAM and/or an event trigger message type denom to another UE.

Thereafter, regarding V2X communication, various V2X scenes are proposed in NR. For example, such various V2X scenarios may include vehicle formation, advanced driving, extension sensors, remote driving, and the like.

Disclosure of Invention

Technical problem

Furthermore, in order for the UE to report HARQ feedback related to SL communication to the base station, UL resources may be configured for the UE. In this case, the UE may determine SL HARQ feedback information (e.g., ACK or NACK) based on monitoring physical side link feedback channel (PSFCH) resources, and the UE may transmit the SL HARQ feedback information to the base station based on UL resources. Thus, the base station can determine whether to allocate additional resources to the UE.

Furthermore, it is necessary to ensure a minimum time gap between UL resources and PSFCH resources. Furthermore, it is necessary to effectively adjust the minimum time gap by reflecting characteristics of SL communication.

Technical proposal

In one embodiment, a method for performing wireless communication by a first device is provided. The method may comprise the steps of: receiving information on Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station from the base station; transmitting first side link control information (SCI) to a second device over a physical side link control channel (PSCCH); transmitting a second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to a second device over a physical side link shared channel (PSSCH) associated with a PSCCH; determining physical side chain feedback channel (PSFCH) resources based on an index of a subchannel and an index of a slot related to the PSSCH; and transmitting SL HARQ feedback for the MAC PDU to the base station based on the UL resource. The minimum time gap between the PSFCH resource and the UL resource may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of the UL BWP, and N may be determined based on a minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and X may be determined based on information related to priority.

In one embodiment, a first device adapted to perform wireless communication is provided. The first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. One or more processors may execute instructions to: receiving information on Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station from the base station; transmitting first side link control information (SCI) to a second device over a physical side link control channel (PSCCH); transmitting a second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to a second device over a physical side link shared channel (PSSCH) associated with a PSCCH; determining physical side chain feedback channel (PSFCH) resources based on an index of a subchannel and an index of a slot related to the PSSCH; and transmitting SL HARQ feedback for the MAC PDU to the base station based on the UL resource. For example, a minimum time gap between PSFCH resources and UL resources may be determined based on a parameter set of N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

Technical effects

The UE can efficiently perform SL communication.

Drawings

Fig. 1 is a diagram for describing NR based V2X communication compared to V2X communication based on RAT used before NR.

Fig. 2 shows a structure of an NR system according to an embodiment of the present disclosure.

Fig. 3 illustrates a radio protocol architecture in accordance with an embodiment of the present disclosure.

Fig. 4 shows a structure of a radio frame of NR based on an embodiment of the present disclosure.

Fig. 5 shows a structure of a slot of an NR frame according to an embodiment of the present disclosure.

Fig. 6 shows an example of BWP according to an embodiment of the present disclosure.

Fig. 7 illustrates a UE performing V2X or SL communication according to an embodiment of the present disclosure.

Fig. 8 illustrates a process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure.

Fig. 9 illustrates three broadcast types, in accordance with embodiments of the present disclosure.

Fig. 10 illustrates a resource unit for CBR measurement in accordance with an embodiment of the present disclosure.

Fig. 11 illustrates a process in which a UE reports SL HARQ feedback to a base station, according to an embodiment of the present disclosure.

Fig. 12 illustrates a mapping method between PSSCH resources and PSFCH resources and a mapping between PSFCH resources and UL resources, according to an embodiment of the present disclosure.

Fig. 13 illustrates a method for a first device to perform wireless communication, in accordance with an embodiment of the present disclosure.

Fig. 14 illustrates a method of a base station performing wireless communication according to an embodiment of the present disclosure.

Fig. 15 shows a communication system 1 according to an embodiment of the present disclosure.

Fig. 16 illustrates a wireless device in accordance with an embodiment of the present disclosure.

Fig. 17 shows a signal processing circuit for transmitting a signal according to an embodiment of the present disclosure.

Fig. 18 illustrates another example of a wireless device in accordance with an embodiment of the present disclosure.

Fig. 19 illustrates a handheld device in accordance with an embodiment of the present disclosure.

Fig. 20 illustrates a vehicle or autonomous vehicle in accordance with an embodiment of the present disclosure.

Detailed Description

In this disclosure, "a or B" may mean "a only", "B only" or "both a and B". In other words, in the present disclosure, "a or B" may be interpreted as "a and/or B". For example, in this disclosure, "A, B or C" may mean any combination of "a only", "B only", "C only" or "A, B, C".

A slash (/) or comma as used in this disclosure may mean "and/or". For example, "A/B" may mean "A and/or B". Thus, "a/B" may mean "a only", "B only" or "both a and B". For example, "A, B, C" may mean "A, B or C".

In the present disclosure, "at least one of a and B" may mean "a only", "B only", or "both a and B". In addition, in the present disclosure, the expression "at least one of a or B" or "at least one of a and/or B" may be interpreted as "at least one of a and B".

In addition, in the present disclosure, "at least one of A, B and C" may mean "a only", "B only", "C only", or "A, B and C in any combination. In addition, "at least one of A, B or C" or "at least one of A, B and/or C" may mean "at least one of A, B and C".

In addition, brackets used in this disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed as an example of "control information". In other words, the "control information" of the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of the "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

The technical features respectively described in a drawing in the present disclosure may be implemented separately or may be implemented simultaneously.

The techniques described below may be used in various wireless communication systems such as Code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented using a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA may be implemented using radio technologies such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and so on. IEEE802.16m is an evolving version of IEEE802.16 e and provides backward compatibility for IEEE802.16 e-based systems. UTRA is part of Universal Mobile Telecommunications System (UMTS). The third generation partnership project (3 GPP) Long Term Evolution (LTE) is part of evolved UMTS (E-UMTS) that uses E-UTRA. The 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-advanced (LTE-a) is an evolution of LTE.

The 5G NR is an LTE-a successor technology corresponding to a novel completely new mobile communication system having characteristics of high performance, low latency, high availability, and the like. The 5G NR may use resources including all available frequency spectrums of a low frequency band less than 1GHz, an intermediate frequency band from 1GHz to 10GHz, and a high frequency (millimeter wave) of 24GHz or more, and the like.

For clarity of description, the following description will focus mainly on LTE-a or 5G NR. However, technical features according to embodiments of the present disclosure will not be limited thereto.

Fig. 2 shows a structure of an NR system according to an embodiment of the present disclosure. The embodiment of fig. 2 may be combined with various embodiments of the present disclosure.

Referring to fig. 2, a next generation radio access network (NG-RAN) may include a BS20 providing user plane and control plane protocol termination to a UE 10. For example, the BS20 may include a next generation node B (gNB) and/or an evolved node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terminology such as a Mobile Station (MS), a User Terminal (UT), a Subscriber Station (SS), a Mobile Terminal (MT), a wireless device, etc. For example, a BS may be referred to as a fixed station that communicates with the UEs 10 and may be referred to as other terminology such as a Base Transceiver System (BTS), an Access Point (AP), and the like.

The embodiment of fig. 2 illustrates a case where only the gNB is included. BS20 may be interconnected via an Xn interface. The BS20 may be interconnected via a fifth generation (5G) core network (5 GC) and NG interface. More specifically, the BS20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a User Plane Function (UPF) 30 via an NG-U interface.

The radio interface protocol layers between the UE and the network may be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the Open System Interconnection (OSI) model well known in communication systems. Wherein a Physical (PHY) layer belonging to the first layer provides an information transfer service using a physical channel, and a Radio Resource Control (RRC) layer located at the third layer controls radio resources between the UE and the network. For this, the RRC layer exchanges RRC messages between the UE and the BS layer.

Fig. 3 illustrates a radio protocol architecture in accordance with an embodiment of the present disclosure. The embodiment of fig. 3 may be combined with various embodiments of the present disclosure. Specifically, (a) in fig. 3 shows a radio protocol stack of a user plane for Uu communication, and (b) in fig. 3 shows a radio protocol stack of a control plane for Uu communication. Fig. 3 (c) shows a radio protocol stack of a user plane for SL communication, and fig. 3 (d) shows a radio protocol stack of a control plane for SL communication.

Referring to fig. 3, a physical layer provides an information transfer service to an upper layer through a physical channel. The physical layer is connected to a Medium Access Control (MAC) layer, which is an upper layer of the physical layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through a transfer channel. The transport channels are classified according to how data is transmitted over the radio interface and what characteristics the data is transmitted.

Data is transferred through a physical channel between different physical layers, i.e., a PHY layer of a transmitter and a PHY layer of a receiver. The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

The MAC layer provides services to a Radio Link Control (RLC) layer, which is a higher layer of the MAC layer, via a logical channel. The MAC layer provides a function of mapping a plurality of logical channels to a plurality of transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping a plurality of logical channels to a single transport channel. The MAC layer provides a data transfer service through a logical channel.

The RLC layer performs concatenation, segmentation and reassembly of radio link control service data units (RLC SDUs). In order to ensure different quality of service (QoS) required for Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely a Transparent Mode (TM), a non-acknowledged mode (UM), and an Acknowledged Mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).

The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer serves to control logical channels, transport channels, and physical channels associated with configuration, reconfiguration, and release of RBs. The RB is a logical path for data transfer between the UE and the network provided by the first layer (i.e., physical layer or PHY layer) and the second layer (i.e., MAC layer, RLC layer, packet Data Convergence Protocol (PDCP) layer, and Service Data Adaptation Protocol (SDAP) layer).

The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include transmission of user data, header compression, and ciphering. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include the transfer of control plane data and ciphering/integrity protection.

The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs a mapping between quality of service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) flags in both DL packets and UL packets.

Configuration of the RB means a process for designating a radio protocol layer and channel properties to provide a specific service and for determining corresponding detailed parameters and operation methods. RBs may then be classified into two types, namely, signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC CONNECTED (rrc_connected) state, otherwise the UE may be in an RRC IDLE (rrc_idle) state. In the case of NR, an RRC INACTIVE (rrc_inactive) state is additionally defined, and a UE in the rrc_inactive state may maintain a connection with the core network and release its connection with the BS.

Downlink transport channels for transmitting (or transmitting) data from a network to a UE include a Broadcast Channel (BCH) for transmitting system information and a downlink Shared Channel (SCH) for transmitting other user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted via a downlink SCH or may be transmitted via a separate downlink Multicast Channel (MCH). In addition, uplink transport channels for transmitting (or transmitting) data from the UE to the network include a Random Access Channel (RACH) for transmitting an initial control message and an uplink Shared Channel (SCH) for transmitting other user traffic or control messages.

Examples of logical channels belonging to a higher layer of a transport channel and mapped to the transport channel may include a Broadcast Control Channel (BCCH), a Paging Control Channel (PCCH), a Common Control Channel (CCCH), a Multicast Control Channel (MCCH), a Multicast Traffic Channel (MTCH), and the like.

Fig. 4 shows a structure of a radio frame of NR based on an embodiment of the present disclosure. The embodiment of fig. 4 may be combined with various embodiments of the present disclosure.

Referring to fig. 4, in NR, a radio frame may be used to perform uplink and downlink transmission. The radio frame is 10ms in length and may be defined as being made up of two fields (HF). A field may include five 1ms Subframes (SFs). A Subframe (SF) may be divided into one or more slots, and the number of slots within the subframe may be determined according to a subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM (a) symbols according to a Cyclic Prefix (CP).

In case of using the normal CP, each slot may include 14 symbols. In case of using the extended CP, each slot may include 12 symbols. Herein, the symbols may include OFDM symbols (or CP-OFDM symbols) and single carrier-FDMA (SC-FDMA) symbols (or discrete fourier transform spread OFDM (DFT-s-OFDM) symbols).

Table 1 shown below shows the number of symbols (N) per slot according to SCS configuration (u) in case of employing normal CP ^slot _symb ) Number of slots per frame (N ^frame,u _slot ) And the number of slots per subframe (N ^subframe,u _slot )。

TABLE 1

SCS(15*2 u )	N slot symb	N frame,u slot	N subframe,u slot
				15KHz(u＝0)	14	10	1
30KHz(u＝1)	14	20	2
				60KHz(u＝2)	14	40	4
120KHz(u＝3)	14	80	8
				240KHz(u＝4)	14	160	16

Table 2 shows examples of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS in case of using the extended CP.

TABLE 2

SCS(15*2 u )	N slot symb	N frame,u slot	N subframe,u slot
				60KHz(u＝2)	12	40	4

In an NR system, OFDM (a) parameter sets (e.g., SCS, CP length, etc.) between a plurality of cells integrated into one UE may be configured differently. Thus, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a slot, or a TTI) consisting of the same number of symbols, collectively referred to as a Time Unit (TU) for simplicity, may be configured differently in the integrated cell.

In the NR, a plurality of parameter sets or SCSs for supporting various 5G services may be supported. For example, in the case of an SCS of 15kHz, a wide range of conventional cellular bands can be supported, and in the case of an SCS of 30kHz/60kHz, dense cities, lower latency, wider carrier bandwidths can be supported. In the case where the SCS is 60kHz or more, in order to overcome the phase noise, a bandwidth of more than 24.25GHz can be used.

The NR frequency bands can be defined as two different types of frequency ranges. Two different types of frequency ranges may be FR1 and FR2. The values of the frequency ranges may be changed (or varied), for example, two different types of frequency ranges may be as shown in table 3 below. Among frequency ranges used in NR systems, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

TABLE 3

Frequency range assignment	Corresponding frequency range	Subcarrier spacing (SCS)
			FR1	450MHz–6000MHz	15、30、60kHz
FR2	24250MHz–52600MHz	60、120、240kHz

As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in table 4 below, FR1 may include a bandwidth in the range of 410MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6GHz (or 5850, 5900, 5925MHz, etc.) and higher. For example, the frequency bands of 6GHz (or 5850, 5900, 5925MHz, etc.) and higher included in FR1 may include unlicensed frequency bands. The unlicensed frequency band may be used for various purposes, such as for vehicle-specific communications (e.g., autopilot).

TABLE 4

Frequency range assignment	Corresponding frequency range	Subcarrier spacing (SCS)
			FR1	410MHz–7125MHz	15、30、60kHz
FR2	24250MHz–52600MHz	60、120、240kHz

Fig. 5 shows a structure of a slot of an NR frame according to an embodiment of the present disclosure. The embodiment of fig. 5 may be combined with various embodiments of the present disclosure.

Referring to fig. 5, a slot includes a plurality of symbols in a time domain. For example, in the case of a normal CP, one slot may include 14 symbols. For example, in the case of the extended CP, one slot may include 12 symbols. Alternatively, in case of the normal CP, one slot may include 7 symbols. However, in the case of the extended CP, one slot may include 6 symbols.

The carrier comprises a plurality of subcarriers in the frequency domain. A Resource Block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of consecutive (physical) resource blocks ((P) RBs) in the frequency domain, and the BWP may correspond to one parameter set (e.g., SCS, CP length, etc.). The carrier may include up to N BWP (e.g., 5 BWP). The data communication may be performed via an enabled BWP. Each element may be referred to as a Resource Element (RE) in the resource grid, and one complex symbol may be mapped to each element.

Hereinafter, a bandwidth part (BWP) and a carrier will be described in detail.

BWP may be a contiguous set of Physical Resource Blocks (PRBs) within a given parameter set. The PRBs may be selected from a contiguous set of portions of a Common Resource Block (CRB) for a given set of parameters on a given carrier.

For example, the BWP may be at least any one of an active BWP, an initial BWP, and/or a default BWP. For example, the UE may not monitor downlink radio link quality in DL BWP other than active DL BWP on the primary cell (PCell). For example, the UE may not receive a PDCCH, a Physical Downlink Shared Channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) other than the active DL BWP. For example, the UE may not trigger a Channel State Information (CSI) report for the inactive DL BWP. For example, the UE may not transmit a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH) outside the active UL BWP. For example, in the downlink case, the initial BWP may be given as a continuous set of RBs (configured by a Physical Broadcast Channel (PBCH)) for a Remaining Minimum System Information (RMSI) control resource set (CORESET). For example, in the case of uplink, the initial BWP may be given by a System Information Block (SIB) for a random access procedure. For example, the default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be the initial DL BWP. To save power, if the UE cannot detect Downlink Control Information (DCI) during a specified period, the UE may switch the active BWP of the UE to a default BWP.

Furthermore, BWP may be defined for SL. The same SL BWP may be used in transmission and reception. For example, the transmitting UE may transmit a SL channel or SL signal on a specific BWP, and the receiving UE may receive the SL channel or SL signal on the specific BWP. In the licensed carrier, the SL BWP may be defined separately from the Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for SL BWP from the BS/network. For example, the UE may receive a configuration for Uu BWP from the BS/network. SL BWP is (pre) configured in the carrier for out-of-coverage NR V2X UEs and rrc_idle UEs. For UEs in rrc_connected mode, at least one SL BWP may be enabled in the carrier.

Fig. 6 shows an example of BWP according to an embodiment of the present disclosure. The embodiment of fig. 6 may be combined with various embodiments of the present disclosure. It is assumed that in the embodiment of fig. 6, the number of BWP is 3.

Referring to fig. 6, a Common Resource Block (CRB) may be a carrier resource block numbered from one end of a carrier band to the other end thereof. In addition, PRBs may be resource blocks numbered within each BWP. Point a may indicate a common reference point for the resource block grid.

Can be defined by point A, offset (N ^start _BWP ) Sum bandwidth (N) ^size _BWP ) To configure BWP. For example, point a may be an external reference point of the PRBs of the carrier, with subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) aligned in point a. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point a. For example, the bandwidth may be the number of PRBs within a given parameter set.

Hereinafter, V2X or SL communication will be described.

The Side Link Synchronization Signal (SLSS) may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for S-PSS, and a Golde (Gold) sequence of length 127 may be used for S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and S-SSS for acquisition of detailed synchronization and for detection of synchronization signal IDs.

The physical side link broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information that the UE must first know before SL signal transmission/reception. For example, the default information may be information related to SLSS, duplex Mode (DM), time Division Duplex (TDD) uplink/downlink (UL/DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH may be 56 bits, including 24-bit Cyclic Redundancy Check (CRC).

The S-PSS, S-SSS, and PSBCH may be included in a block format supporting periodic transmission, e.g., a SL Synchronization Signal (SS)/PSBCH block, hereinafter, a side link synchronization signal block (S-SSB). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical side link control channel (PSCCH)/physical side link shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within a (pre) configured Side Link (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SB). For example, the PSBCH may exist across 11 RBs. In addition, the frequency location of the S-SSB may be (pre) configured. Thus, the UE does not have to perform hypothesis detection at the frequency to find the S-SSB in the carrier.

Fig. 7 illustrates a UE performing V2X or SL communication according to an embodiment of the present disclosure. The embodiment of fig. 7 may be combined with various embodiments of the present disclosure.

Referring to fig. 7, in V2X or SL communications, the term "UE" may generally refer to a user's UE. However, if a network device such as a BS transmits/receives signals according to a communication scheme between UEs, the BS may also be regarded as a kind of UE. For example, UE 1 may be the first apparatus 100 and UE 2 may be the second apparatus 200.

For example, UE1 may select a resource unit corresponding to a particular resource in a resource pool meaning a set of resource series. In addition, UE1 may transmit the SL signal by using the resource unit. For example, a resource pool in which UE1 can transmit a signal may be configured to UE 2 as a receiving UE, and the signal of UE1 may be detected in the resource pool.

Herein, if UE1 is within the connection range of the BS, the BS may inform the UE1 of the resource pool. Otherwise, if UE1 is out of the connection range of the BS, another UE may inform UE1 of the resource pool, or UE1 may use a preconfigured resource pool.

In general, a resource pool may be configured in units of a plurality of resources, and each UE may select a unit of one or more resources to use in its SL signaling.

Hereinafter, resource allocation in SL will be described.

Fig. 8 illustrates a process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure. The embodiment of fig. 8 may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, a transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

For example, (a) in fig. 8 shows UE operation related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) in fig. 8 shows UE operation related to NR resource allocation pattern 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

For example, (b) in fig. 8 shows UE operation related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, (b) in fig. 8 shows UE operation in relation to NR resource allocation pattern 2.

Referring to (a) in fig. 8, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling on UE 1 through PDCCH (e.g., downlink Control Information (DCI)) or RRC signaling (e.g., configuration grant type 1 or configuration grant type 2), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may transmit side link control information (SCI) to UE 2 over a physical side link control channel (PSCCH), and thereafter transmit SCI-based data to UE 2 over a physical side link shared channel (PSSCH).

Referring to (b) of fig. 8, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE may determine SL transmission resources within SL resources configured by the BS/network or preconfigured SL resources. For example, the configured SL resources or pre-configured SL resources may be a pool of resources. For example, the UE may autonomously select or schedule resources for SL transmission. For example, the UE may perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE may autonomously select resources within the selection window by performing sensing and resource (re) selection procedures. For example, sensing may be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources in the resource pool, may transmit SCI to UE 2 through the PSCCH, and thereafter, SCI-based data may be transmitted to UE 2 through the PSSCH.

Fig. 9 illustrates three broadcast types, in accordance with embodiments of the present disclosure. The embodiment of fig. 9 may be combined with various embodiments of the present disclosure. Specifically, (a) in fig. 9 shows broadcast-type SL communication, (b) in fig. 9 shows unicast-type SL communication, and (c) in fig. 9 shows multicast-type SL communication. In the case of unicast-type SL communication, a UE may perform one-to-one communication for another UE. In the case of multicast type SL transmission, the UE may perform SL communication for one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL multicast communications may be replaced with SL multicast communications, SL one-to-many communications, and the like.

Hereinafter, side Link (SL) congestion control will be described.

If the UE autonomously determines SL transmission resources, the UE also autonomously determines the size and frequency of use of the resources for use by the UE. Of course, the use of a resource size or frequency of use greater than or equal to a particular level may be limited due to constraints from the network or the like. However, if all UEs use a relatively large amount of resources in a case where many UEs are concentrated in a specific area at a specific time, overall performance may be significantly deteriorated due to mutual interference.

Thus, the UE may need to observe the channel situation. If it is determined that an excessively large amount of resources are consumed, it is preferable that the UE autonomously reduces the use of resources. In the present disclosure, this may be defined as congestion Control (CR). For example, the UE may determine whether the measured energy in the unit time/frequency resources is greater than or equal to a specific level, and may adjust the amount of transmission resources and the frequency of use thereof based on the ratio of the unit time/frequency resources in which the energy greater than or equal to the specific level is observed. In the present disclosure, a ratio of time/frequency resources in which energy greater than or equal to a certain level is observed may be defined as a Channel Busy Rate (CBR). The UE may measure CBR of the channel/frequency. In addition, the UE may transmit the measured CBR to the network/BS.

Fig. 10 illustrates a resource unit for CBR measurement in accordance with an embodiment of the present disclosure. The embodiment of fig. 10 may be combined with various embodiments of the present disclosure.

Referring to fig. 10, as a result of the UE measuring RSSI based on the sub-channels for a certain period (e.g., 100 ms), CBR may represent the number of sub-channels in which a measurement result value of a Received Signal Strength Indicator (RSSI) has a value greater than or equal to a pre-configured threshold. Alternatively, CBR may represent a ratio of subchannels having a value greater than or equal to a pre-configured threshold among the subchannels for a specific duration. For example, in the embodiment of fig. 10, if it is assumed that the shaded sub-channels are sub-channels having a value greater than or equal to a pre-configured threshold, CBR may represent the ratio of the shaded sub-channels within a period of 100 ms. In addition, CBR may be reported to the BS.

In addition, congestion control may be necessary in consideration of the priority of traffic (e.g., packets). To this end, for example, the UE may measure a channel occupancy ratio (CR). In particular, the UE may measure CBR, and the UE may determine a maximum value crlimit of channel occupancy k (CRk) that may be occupied by traffic corresponding to each priority (e.g., k) based on CBR. For example, the UE may derive a maximum crlimit of the channel occupancy related to the priority of each service based on a predetermined table of CBR measurements. For example, in the case of traffic with a relatively high priority, the UE may derive a maximum value of a relatively large channel occupancy. Thereafter, the UE may perform congestion control by limiting the sum of channel occupancy of traffic whose priority k is lower than i to a value less than or equal to a specific value. Based on this approach, the channel occupancy can be more severely limited for relatively low priority traffic.

In addition, the UE may perform SL congestion control by using adjustment of transmission power level, dropping packets, determining whether retransmission will be performed, adjustment of transmission RB size (MCS coordination), and the like.

Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

In the case of SL unicast and multicast, HARQ feedback and HARQ combining in the physical layer may be supported. For example, in case that the receiving UE operates in the resource allocation mode 1 or 2, the receiving UE may receive the PSSCH from the transmitting UE, and the receiving UE may transmit HARQ feedback corresponding to the PSSCH to the transmitting UE through a physical side link feedback channel (PSFCH) using a side link feedback control information (SFCI) format.

For example, SL HARQ feedback may be enabled for unicast. In this case, in a non-code block group (non-CBG) operation, the receiving UE may decode the PSCCH targeted to the receiving UE, and when the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE may generate the HARQ-ACK. Thereafter, the receiving UE may transmit the HARQ-ACK to the transmitting UE. In contrast, after the receiving UE decodes the PSCCH targeted to the receiving UE, if the receiving UE fails to successfully decode a transport block associated with the PSCCH, the receiving UE may generate a HARQ-NACK and the receiving UE may transmit the HARQ-NACK to the transmitting UE.

For example, SL HARQ feedback may be enabled for multicast. For example, during non-CBG, two different types of HARQ feedback options may be supported for multicast.

(1) Multicast option 1: after decoding the PSCCH targeted to the receiving UE, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH if the receiving UE fails to decode a transport block associated with the PSCCH. In contrast, when the receiving UE decodes the PSCCH targeted to the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE does not transmit the HARQ-ACK to the transmitting UE.

(2) Multicast option 2: after decoding the PSCCH targeted to the receiving UE, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH if the receiving UE fails to decode a transport block associated with the PSCCH. And, when the receiving UE decodes the PSCCH targeted to the receiving UE and when the receiving UE successfully decodes a transport block associated with the PSCCH, the receiving UE may transmit the HARQ-ACK to the transmitting UE via the PSFCH.

For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication may share PSFCH resources. For example, UEs belonging to the same group may transmit HARQ feedback by using the same PSFCH resource.

For example, if multicast option 2 is used in the SLHARQ feedback, each UE performing multicast communication may use a different PSFCH resource for HARQ feedback transmission. For example, UEs belonging to the same group may transmit HARQ feedback by using different PSFCH resources.

For example, when SL HARQ feedback is enabled for multicast, the receiving UE may determine whether to transmit HARQ feedback to the transmitting UE based on a transmit-receive (TX-RX) distance and/or a Reference Signal Received Power (RSRP).

For example, in the multicast option 1, in case of HARQ feedback based on TX-RX distance, if the TX-RX distance is less than or equal to the communication range requirement, the receiving UE may transmit HARQ feedback in response to the PSSCH to the transmitting UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE may not transmit HARQ feedback in response to the PSSCH to the transmitting UE. For example, the transmitting UE may inform the receiving UE of the location of the transmitting UE through the SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on the location of the receiving UE and the location of the transmitting UE. For example, the receiving UE may decode the SCI associated with the PSSCH and thus may be aware of the communication range requirements for the PSSCH.

For example, in the case of resource allocation pattern 1, the time (offset) between PSFCH and PSSCH may be configured or preconfigured. In the case of unicast and multicast, if retransmission must be made on SL, it can be indicated to BS by UE in coverage using PUCCH. The transmitting UE may transmit an indication to a serving BS of the transmitting UE in the form of a Scheduling Request (SR)/Buffer Status Report (BSR) instead of the HARQ ACK/NACK. In addition, the BS may schedule SL retransmission resources for the UE even if the BS does not receive the indication. For example, in the case of resource allocation pattern 2, the time (offset) between PSFCH and PSSCH may be configured or preconfigured.

For example, from the perspective of UE transmission in a carrier, TDM between PSCCH/PSSCH and PSFCH may be allowed for the PSFCH format for SL in the slot. For example, a sequence-based PSFCH format with a single symbol may be supported. Herein, the single symbol may not be the AGC duration. For example, the sequence-based PSFCH format may be applied to unicast and multicast.

For example, in a time slot associated with a resource pool, the PSFCH resources may be periodically configured for N time slot durations, or may be preconfigured. For example, N may be configured to one or more values greater than or equal to 1. For example, N may be 1, 2 or 4. For example, HARQ feedback for transmissions in a particular resource pool may be transmitted over PSFCH only on the particular resource pool.

For example, if the transmitting UE transmits the PSSCH to the receiving UE across slots #x to #n, the receiving UE may transmit HARQ feedback in response to the PSSCH to the transmitting UE in slot# (n+a). For example, slot# (n+a) may include PSFCH resources. Herein, for example, a may be a minimum integer greater than or equal to K. For example, K may be the number of logical time slots. In this case, K may be the number of time slots in the resource pool. Alternatively, K may be the number of physical time slots, for example. In this case, K may be the number of slots inside or outside the resource pool.

For example, if the receiving UE transmits HARQ feedback on the PSFCH resources in response to one PSSCH that the transmitting UE transmits to the receiving UE, the receiving UE may determine the frequency and/or code domain of the PSFCH resources based on an implicit mechanism in the configured resource pool. For example, the receiving UE may determine the frequency and/or code domain of the PSFCH resource based on at least one of a slot index associated with the PSCCH/PSSCH/PSFCH, a subchannel associated with the PSCCH/PSSCH, or an identifier identifying each receiving UE in the group of HARQ feedback based on multicast option 2. Additionally/alternatively, for example, the receiving UE may determine a frequency domain and/or a code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and/or location information.

For example, if the HARQ feedback transmission through the PSFCH of the UE overlaps with the HARQ feedback reception through the PSFCH, the UE may select any one of the HARQ feedback transmission through the PSFCH and the HARQ feedback reception through the PSFCH based on a priority rule. For example, the priority rule may be based at least on a priority indication of the associated PSCCH/PSCCH.

For example, if HARQ feedback transmissions by a UE over a PSFCH overlap for multiple UEs, the UE may select a particular HARQ feedback transmission based on a priority rule. For example, the priority rule may be based on a lowest priority indication of the associated PSCCH/PSCCH.

Further, in the present disclosure, the transmitting UE (i.e., TX UE) may be a UE that transmits data to a (target) receiving UE (i.e., RX UE). For example, the TX UE may be a UE performing PSCCH transmission and/or PSSCH transmission. For example, the TX UE may be a UE that transmits the SL CSI-RS and/or the SL CSI report request indicator to the (target) RX UE. For example, the TX UE may be a UE that transmits (predefined) reference signals (e.g., PSSCH demodulation reference signals (DM-RSs)) and/or SL (L1) RSRP report request indicators to the (target) RX UE for SL (L1) RSRP measurements. For example, the TX UE may be a UE that transmits (control) channels (e.g., PSCCH, PSSCH, etc.) and/or reference signals (e.g., DM-RS, CSI-RS) on (control) channels for SL Radio Link Monitoring (RLM) operation and/or SL Radio Link Failure (RLF) operation of the (target) RX UE.

Further, in the present disclosure, the receiving UE (i.e., RX UE) may be a UE that transmits SL HARQ feedback to the transmitting UE (i.e., TX UE) based on whether decoding of data received from the TX UE is successful and/or whether detection/decoding of PSCCH (associated with PSSCH scheduling) transmitted by the TX UE is successful. For example, the RX UE may be a UE performing SL CSI transmission to the TX UE based on the SL CSI-RS and/or the SL CSI report request indicator received from the TX UE. For example, the RX UE may be a UE that transmits to the TX UE a SL (L1) RSRP measurement value that is measured based on a (predefined) reference signal and/or a SL (L1) RSRP report request indicator received from the TX UE. For example, the RX UE may be a UE that transmits data of the RX UE to the TX UE. For example, the RX UE may be a UE performing SL RLM operation and/or SLRLF operation based on (pre-configured) (control) channels and/or reference signals on (control) channels received from the TX UE.

Further, in the present disclosure, the TX UE may transmit all or part of the following information to the RX UE through the SCI. Herein, for example, the TX UE may transmit all or part of the following information to the RX UE through the first SCI and/or the second SCI.

PSSCH (and/or PSCCH) related resource allocation information (e.g., location/number of time/frequency resources, resource reservation information (e.g., period))

-an SLCSI report request indicator or a SL (L1) RSRP (and/or SL (L1) RSRQ and/or SL (L1) RSSI) report request indicator

-SLCSI transmit indicator (or SL (L1) RSRP (and/or SL (L1) RSRQ and/or SL (L1) RSSI) information transmit indicator)) (on PSSCH)

-Modulation and Coding Scheme (MCS) information

-transmit power information

-L1 destination ID information and/or L1 source ID information

-SLHARQ process ID information

-New Data Indicator (NDI) information

Redundancy Version (RV) information

QoS information (e.g., priority information) related to a traffic/packet to be transmitted

-information about the number of antenna ports used for (transmitting) SL CSI-RS or SL CSI-RS transmission indicator

Location (or range) information or TX UE location information of target RX UE (requesting SLHARQ feedback for it)

Reference signal (e.g., DM-RS, etc.) information related to decoding and/or channel estimation of data to be transmitted through the PSSCH. For example, the reference signal information may be information related to a pattern of (time-frequency) mapping resources of the DM-RS, rank information, antenna port index information, information on the number of antenna ports, and the like.

Furthermore, in the present disclosure, for example, the PSCCH may be replaced with at least one of an SCI, a first SCI (first stage SCI), and/or a second SCI (second stage SCI), or vice versa. For example, the SCI may be replaced with at least one of the PSCCH, the first SCI, and/or the second SCI, or vice versa. For example, the PSSCH may be replaced with a second SCI and/or PSCCH, or vice versa.

Further, in the present disclosure, for example, if the SCI configuration field is divided into two groups in consideration of a (relatively) high SCI payload size, an SCI including a first SCI configuration field group may be referred to as a first SCI or a first level SCI, and an SCI including a second SCI configuration field group may be referred to as a second SCI or a second level SCI. For example, the first SCI and the second SCI may be transmitted over different channels. For example, the transmitting UE may transmit the first SCI to the receiving UE over the PSCCH. For example, the second SCI may be transmitted to the receiving UE over a (separate) PSCCH or may be transmitted in an piggybacked manner with the data over a PSSCH.

Further, in the present disclosure, for example, "configured/configured" or "defined/defined" may refer to (pre) configured from a base station or a network. For example, "configured/configured" or "defined/defined" may be a (pre-) configuration from a base station or network for each resource pool. For example, the base station or network may send information related to "configuration" or "definition" to the UE. For example, the base station or network may send information related to "configuration" or "definition" to the UE through predefined signaling. For example, the predefined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and/or SIBs.

Further, in the present disclosure, for example, "configured/configured" or "defined/defined" may refer to being specified or configured by pre-configured signaling between UEs. For example, information related to "configuration" or "definition" may be transmitted or received between UEs through pre-configuration signaling. For example, the predefined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and/or SIBs.

Further, in the present disclosure, for example, RLF may be replaced/replaced by out-of-sync (OOS) and/or in-sync (IS), and vice versa.

Further, in the present disclosure, for example, resource Blocks (RBs) may be replaced/replaced with subcarriers, or vice versa. For example, packets or traffic may be replaced/replaced with Transport Blocks (TBs) or medium access control protocol data units (MAC PDUs) or vice versa depending on the transport layer. For example, code Block Groups (CBGs) may be replaced/replaced with TBs, or vice versa. For example, the source ID may be replaced/replaced with the destination ID, or vice versa. For example, the L1 ID may be replaced with the L2 ID, or vice versa. For example, the L1 ID may be an L1 source ID or an L1 destination ID. For example, the L2 ID may be an L2 source ID or an L2 destination ID.

Further, in the present disclosure, for example, the operation of the TX UE reserving/selecting/determining retransmission resources may include an operation of the TX UE reserving/selecting/determining potential retransmission resources in which whether to actually use is determined based on SL HARQ feedback information received from the RX UE.

Further, in the present disclosure, the sub-selection window may be replaced with a selection window and/or a preconfigured number of resource sets within a selection window, or vice versa.

Further, in the present disclosure, SL mode 1 may refer to a resource allocation method or a communication method in which a base station directly schedules SL transmission resources for TX UEs through predefined signaling (e.g., DCI or RRC message). For example, SL mode 2 may refer to a resource allocation method or a communication method in which a UE independently selects SL transmission resources from a resource pool preconfigured or configured by a base station or a network. For example, a UE performing SL communication based on SL mode 1 may be referred to as a mode 1UE or a mode 1TX UE, and a UE performing SL communication based on SL mode 2 may be referred to as a mode 2UE or a mode 2TX UE.

Further, in the present disclosure, for example, dynamic permissions (DG) may be replaced/replaced with configuration permissions (CG) and/or semi-persistent scheduling (SPS) permissions, or vice versa. For example, DG may be replaced with a combination of CG and SPS permissions, or vice versa. For example, the CG may include at least one of a configuration license (CG) type 1 and/or a configuration license (CG) type 2. For example, in CG type 1, the permissions may be provided by RRC signaling and may be stored as configuration permissions. For example, in CG type 2, a grant may be provided through PDCCH, and may be stored or deleted as a configuration grant based on L1 signaling indicating the enablement or disablement of the grant. For example, in CG type 1, the base station may allocate periodic resources to the TX UE through RRC messages. For example, in CG type 2, the base station may allocate periodic resources to TX UEs through RRC messages, and the base station may dynamically enable or disable periodic resources through DCI.

Furthermore, in the present disclosure, the channels may be replaced/substituted with signals, or vice versa. For example, the transmission/reception of a channel may include transmission/reception of a signal. For example, the transmission/reception of signals may include transmission/reception of channels. For example, the transmissions may be replaced with at least one of unicast, multicast and/or broadcast transmissions, or vice versa. For example, the broadcast type may be replaced with at least one of unicast, multicast and/or broadcast, or vice versa. For example, a transmission or type of transmission may include unicast, multicast, and/or broadcast.

Further, in the present disclosure, resources may be replaced/replaced with slots or symbols, or vice versa. For example, the resources may include time slots and/or symbols.

Further, in the present disclosure, priority may be replaced with at least one of Logical Channel Prioritization (LCP), latency, reliability, minimum required communication range, proSe Per Packet Priority (PPPP), side Link Radio Bearers (SLRBs), qoS profiles, qoS parameters, and/or requirements, or vice versa.

Further, in the present disclosure, for example, for convenience of description, a (physical) channel used when the RX UE transmits at least one of the following information to the TX UE may be referred to as a PSFCH.

-SL HARQ feedback, SL CSI, SL (L1) RSRP

Further, in the present disclosure, uu channels may include UL channels and/or DL channels. For example, the UL channel may include PUSCH, PUCCH, sounding Reference Signals (SRS), and the like. For example, the DL channel may include PDCCH, PDSCH, PSS/SSS, etc. For example, the SL channels may include PSCCH, PSSCH, PSFCH, PSBCH, PSSS/SSSS, etc.

Further, in the present disclosure, the side link information may include at least one of side link message, side link packet, side link service, side link data, side link control information, and/or side link Transport Block (TB). For example, the side link information may be transmitted over the PSSCH and/or PSCCH.

Further, in the present disclosure, high priority may mean a small priority value, and low priority may mean a large priority value. For example, table 5 shows an example of the priorities.

TABLE 5

Service or logical channels	Priority value
		Service a or logical channel a	1
Service B or logical channel B	2
		Service C or logical channel C	3

Referring to table 5, for example, service a or logical channel a associated with the minimum priority value may have the highest priority. For example, service C or logical channel C associated with the largest priority value may have the lowest priority.

The various embodiments of the present disclosure may be implemented independently or may be implemented in combination with each other. For example, rule #a and rule #b may be implemented independently or may be implemented in combination with each other.

Further, from the perspective of the MODE 1TX UE, a time gap between the PSFCH reception time (including SL HARQ-ACK information related to the MAC PDU transmitted by itself) and the UL channel (e.g., PUCCH, PUSCH) transmission time including SL HARQ-ACK information may be required to ensure minimum required processing time. In this case, if the time slot is fixed to a value regardless of the SL service-related QoS requirements (e.g., this is generally identifiable between the base station and the UE by logical channel information mapped to MODE 1SL grants, etc.), the value should be finally defined as a value supporting the SL service with the most stringent QoS requirements (e.g., delay). Thus, a problem may occur that the UE implementation becomes excessive (regardless of the type of SL service that the UE is actually interested in).

Fig. 11 illustrates a process in which a UE reports SL HARQ feedback to a base station, according to an embodiment of the present disclosure. The embodiment of fig. 11 may be combined with various embodiments of the present disclosure.

Referring to fig. 11, in step S1110, a TX UE may receive information related to SL resources and/or information related to UL resources from a base station. For example, the SL resources may include PSCCH resources and/or PSSCH resources. For example, UL resources may include PUCCH resources and/or PUSCH resources.

For example, in case of DG, the base station may transmit DCI including information related to SL resources and information related to UL resources to the TX UE. For example, in case of CG type 1, the base station may transmit an RRC message (e.g., SL-configured grant configuration) including information related to SL resources and information related to UL resources to the TX UE. For example, in case of CG type 2, the base station may transmit an RRC message (e.g., SL-configured grant) including information about SL resources to the TX UE, and then the base station may enable or disable the SL resources through DCI. In addition, for example, in case of CG type 2, DCI may include information related to UL resources.

In step S1120, the TX UE may transmit the PSCCH to the RX UE. For example, the TX UE may send the first SCI to the RX UE over the PSCCH.

In step S1130, the TX UE may transmit a PSCCH related PSCCH to the RX UE. For example, the TX UE may send the second SCI and/or data (e.g., MAC PDU, TB) to the RX UE via the PSCCH associated with the PSCCH.

In step S1140, the TX UE and/or the RX UE may determine PSFCH resources. For example, the TX UE and/or the RX UE may determine PSFCH resources related to PSSCH resources based on the slot index of the PSSCH resources and the subchannel index of the PSSCH resources. For example, the TX UE and/or the RX UE may determine PSFCH resources related to the PSSCH resources based on the slot index of the PSSCH resources, the subchannel index of the PSSCH resources, and the source ID of the TX UE. For example, the TX UE and/or the RX UE may determine PSFCH resources related to PSSCH resources based on a slot index of the PSSCH resources, a subchannel index of the PSSCH resources, a source ID of the TX UE, and a member ID of the RX UE.

In step S1150, the TX UE may monitor PSFCH from the RX UE on the PSFCH resource. For example, the TX UE may monitor SL HARQ feedback from the RX UE based on the PSFCH resources.

In step S1160, the TX UE may transmit PUCCH and/or PUSCH to the base station. For example, the TX UE may send SL HARQ feedback to the base station based on PUCCH resources and/or PUSCH resources. For convenience of description, the PUCCH resource and/or the PUSCH resource may be referred to as UL resource. For example, if the TX UE receives a NACK from the RX UE over the PSFCH, the TX UE may report the NACK to the base station based on UL resources. In this case, the base station may allocate additional retransmission resources to the TX UE. For example, if the TX UE receives an ACK from the RX UE over the PSFCH, the TX UE may report the ACK to the base station based on UL resources. In this case, the base station may not allocate additional retransmission resources to the TX UE. For example, if the TX UE fails to monitor the PSFCH on the PSFCH resources, the TX UE may report a NACK to the base station based on the UL resources. In this case, the base station may allocate additional retransmission resources to the TX UE.

For example, a minimum time gap between PSFCH resources and UL resources needs to be guaranteed. In the present disclosure, the minimum time gap may be referred to as min_tgap or T _prep . Hereinafter, based on various embodiments of the present disclosure, a minimum time gap between PSFCH resources and UL resources will be described in detail.

Based on embodiments of the present disclosure, the values of min_tgap may be configured/defined for the UE according to the rules described in table 6. For example, the value of MIN_TGAP may be T _prep Is a value of (2).

For example, the value of min_tgap may be the minimum time interval/offset between the time the UE completes reception of the PSFCH and the start time of the PUCCH. For example, the value of min_tgap may be the minimum time interval/offset between the time the UE completes reception of the PSFCH and the start time of PUSCH piggybacking PUCCH related to the PSFCH. For example, the value of min_tgap may be the minimum time interval/offset between the time the UE completes the reception of PSFCH and the start time of PUCCH piggybacked on PUSCH. For example, the start time of the PUCCH mounted on PUSCH may be the start time of the forefront PUCCH mounted on PUSCH in the time domain. For example, the PSFCH may be a PSFCH received by the UE on the last PSFCH slot associated with the PUCCH. For example, the start time of the PUCCH may be a time when the UE starts transmission of the PUCCH. For example, the start time of PUSCH may be the time when UE starts transmission of PUSCH. For example, the PUCCH may include SL HARQ feedback information. For example, the PUCCH may include SL HARQ feedback information related to the PSFCH.

Fig. 12 illustrates a mapping method between PSSCH resources and PSFCH resources and a mapping between PSFCH resources and UL resources, according to an embodiment of the present disclosure. The embodiment of fig. 12 may be combined with various embodiments of the present disclosure.

Referring to fig. 12, the minimum time gap may be a time interval or a time offset between a last PSFCH resource and an UL resource among a plurality of PSFCH resources related to the UL resource.

Table 6 shows that the UE obtains/determines the minimum time gap (e.g., T _prep ) Is a method of (2).

TABLE 6

Herein, for example, the value of min_tgap may include at least one of a time (e.g., minimum time) required for configuring/processing PUCCH information and/or a time (e.g., minimum time) required for PSFCH detection/information derivation (of UE). For example, the value of X (in table 6) may be configured based on the following proposed rule(s). For example, the value of X may be a value in milliseconds. For example, the value of X may be a value in microseconds. For example, the X value may be a value based on a symbol length unit of a subcarrier spacing related to SL. For example, the value of X may be a value based on a symbol length unit of a subcarrier spacing related to UL. For example, the value of X may be a value based on a symbol length unit of a minimum subcarrier spacing among the UL-related subcarrier spacing and the SL-related subcarrier spacing.

For example, the value of X may vary based on the number of PSFCHs to be (simultaneously) received/processed by the UE in order to configure/transmit PUCCH information. For example, the value of X may vary based on the number of PSFCHs to be (simultaneously) received/processed by the UE on the last PSFCH slot related to PUCCH in order to configure/transmit PUCCH information. Herein, the number of PSFCHs may be the maximum number of PSFCHs, the minimum number of PSFCHs, or the average number of PSFCHs.

For example, the value of X may vary based on the number of PSFCHs to be (simultaneously) received/processed by the UE to process/transmit the PUCCH (related to the PSFCH) by piggybacking on the PUSCH. For example, the value of X may be changed based on the number of PSFCHs of the PUCCH (related to the PSFCH) to be (simultaneously) received/processed on the last PSFCH slot related to the PUCCH by being processed/transmitted by being piggybacked on the PUSCH. Herein, the number of PSFCHs may be the maximum number of PSFCHs, the minimum number of PSFCHs, or the average number of PSFCHs.

For example, parameters related to the proposed method/rule(s) of the present disclosure (e.g., min_tgap, X, N (reflecting/including X (described in the present disclosure)) and/or whether application parameters may be configured/restricted differently or independently for UEs for respective service priorities or in a service priority specific manner. For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for each service type or for the UE in a service type specific manner. For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each (service) QoS requirement or in a (service) QoS requirement specific manner. For example, qoS requirements may include latency and/or reliability.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each (resource pool) congestion level or in a (resource pool) congestion level specific manner. For example, the congestion level may include CBR. For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for each resource pool or for the UE in a resource pool specific manner.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each broadcast type or in a broadcast type specific manner. For example, the broadcast type may include unicast, multicast, or broadcast.

For example, the parameters and/or whether the parameters are applied may be configured/limited differently or independently for the UE for each HARQ feedback scheme or in a HARQ feedback scheme specific manner. For example, the HARQ feedback scheme may include an ACK/NACK feedback scheme or a NACK ONLY feedback scheme.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each SL operation mode or in a SL operation mode specific manner. For example, the SL operating mode may include mode 1 or mode 2.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for each MAC PDU or for the UE in a MAC PDU specific manner. For example, the MAC PDU may include HARQ FEEDBACK ENABLED MAC PDU or HARQ FEEDBACK DISABLED MAC PDU. For example, HARQ FEEDBACK ENABLED MAC PDU may be a MAC PDU composed of packets related to logical channels requiring HARQ feedback, and HARQ FEEDBACK DISABLED MAC PDU may be a MAC PDU composed of packets related to logical channels not requiring HARQ feedback, for example.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for each TB or for the UE in a TB specific manner. For example, the TBs may include TBs requiring HARQ feedback or TBs not requiring HARQ feedback.

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for the respective (maximum or minimum or average) number of SL sessions (operated (or operated) by the UE) or in a specific manner for the (maximum or minimum or average) number of SL sessions (operated (or operated) by the UE).

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for each maximum (or minimum or average) number of PSFCHs that may be received/processed (or transmitted) by the UE (e.g., UE CAPABILITY) or in a manner specific to the maximum (or minimum or average) number of PSFCHs that may be received/processed (or transmitted) by the UE (e.g., UE CAPABILITY).

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each (resource pool related) PSFCH resource period or in a (resource pool related) PSFCH resource period specific manner.

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for the respective number of bits/information of the SL HARQ feedback transmitted over the (specific) PUCCH or in a specific manner for the number of bits/information of the SL HARQ feedback transmitted over the (specific) PUCCH. For example, the bit number/information amount of the SL HARQ feedback may include a maximum bit number/information amount of the SL HARQ feedback, a minimum bit number/information amount of the SL HARQ feedback, or an average bit number/information amount of the SL HARQ feedback.

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for the respective (maximum or minimum or average) number of (last) PSFCH slots (associated (feedback bundle) PSSCH slots) associated with the (specific) PUCCH or in a specific manner for the (maximum or minimum or average) number of (last) PSFCH slots (associated (feedback bundle) PSSCH slots) associated with the (specific) PUCCH.

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for the respective (maximum or minimum or average) number of PSFCHs that need to be (simultaneously) received for configuring PUCCH information (on the last PSFCH slot associated with the PUCCH) or in a specific manner for the (maximum or minimum or average) number of PSFCHs that need to be (simultaneously) received for configuring PUCCH information (on the last PSFCH slot associated with the PUCCH).

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each value of the counter side assignment index field (on DG DCI) or in a particular manner of the value of the counter side assignment index field (on DG DCI).

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for the respective (maximum or minimum or average) number/positions of the symbols related to the SL slot (in the resource pool) (on the last PSFCH slot associated with the PUCCH) or in a (maximum or minimum or average) number/positions of the symbols related to the SL slot (in the resource pool) (on the last PSFCH slot associated with the PUCCH).

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for the respective (maximum or minimum or average) number/positions of the PSSCH related symbols (in the resource pool) (on the last PSFCH slot associated with the PUCCH) or in a (maximum or minimum or average) number/positions of the PSSCH related symbols (in the resource pool) (on the last PSFCH slot associated with the PUCCH).

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for each number/position of PSFCH symbols in the SL slot (on the last PSFCH slot associated with the PUCCH) or in a manner specific to the number/position of PSFCH symbols in the SL slot (on the last PSFCH slot associated with the PUCCH).

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each (preconfigured) PSSCH DMRS time domain pattern (related to the resource pool) or in a specific manner for the (preconfigured) PSSCH DMRS time domain pattern (related to the resource pool).

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for or in a specific manner for the respective maximum (or minimum or average) number of (selectable) PSSCH (time domain) DMRS (pattern) symbols.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each position/index of the last DMRS symbol in a SL slot among (selectable) PSSCH (time domain) DMRS (pattern) symbols or in a specific manner for the position/index of the last DMRS symbol in a SL slot among (selectable) PSSCH (time domain) DMRS (pattern) symbols.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE based on whether the SL CSI-RS (and/or PT-RS) is configured (in the resource pool) or depending on whether the SL CSI-RS (and/or PT-RS) is configured (in the resource pool).

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for or in a specific way of the respective synchronization difference between Uu and SL communications. For example, the synchronization difference between Uu communication and SL communication may include a subframe boundary difference, a slot boundary difference, a symbol boundary difference, or a (starting point) difference between SFN 0 and DFN 0.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE based on whether the synchronization difference between Uu and SL communications exceeds a pre-configured (allowed) threshold or depending on whether the synchronization difference between Uu and SL communications exceeds a pre-configured (allowed) threshold.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each PUCCH-related HARQ codebook type or in a PUCCH-related HARQ codebook type specific manner. For example, the PUCCH-related HARQ codebook type may include a semi-static codebook or a dynamic codebook.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each number of PUSCH symbols for the PUCCH (related to PSFCH) or in a number specific manner for the PUSCH symbols for the PUCCH (related to PSFCH).

For example, the parameters and/or whether the application parameters may be configured/limited differently or independently for the UE for or in a manner specific to the respective number/location of DMRS symbols on PUSCH.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each grant or in a grant-specific manner. For example, the permissions may include mode 1DG or CG.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each (PSFCH) SL parameter set or in a (PSFCH) SL parameter set specific manner. For example, the parameter set may include a subcarrier spacing, a CP length, or a CP type.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for each (PUCCH) UL parameter set or in a (PUCCH) UL parameter set specific manner.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for or in a manner specific to the respective minima of the UL and SL parameter sets.

For example, the parameters and/or whether the application parameters may be configured/restricted differently or independently for the UE for or in a specific manner for each combination of UL and SL parameter sets.

For example, in the present disclosure, the term "X" may be defined by the terms "N" or "T _prep "replace to explain (or extend).

1. Rule #A

For example, the base station/network may send/configure/limit the value of X (and/or reflect/include the value of X (described in this disclosure) and/or T (in table 6) to the UE differently or independently for each of and/or in a manner specific to the following parameter(s) _prep A value of N of the value of (c). For example, the base station/network may send the value of X (and/or reflect/include the value of X (described in this disclosure) and/or T (in table 6)) to the UE through RRC, SIB, PRECONFIGURATION and/or (a predefined field in DG and/or CG activity) DCI _prep A value of N of the value of (c). For example, the value of X (and/or reflecting/including the value of X (described in this disclosure) and/or T (in Table 6) _prep The value of N of the value of (a) may be fixed for each of the following parameter(s). For example, the parameters may include at least one of the parameters listed below.

-service priority

Type of service

- (service) QoS requirements (e.g. latency, reliability)

- (resource pool) congestion level (e.g. CBR)

-resource pool

Broadcast type (e.g., unicast, multicast, broadcast)

HARQ feedback schemes (e.g., ACK/NACK feedback, NACK ONLY feedback)

SL MODE of operation (e.g., MODE 1, MODE 2)

HARQ FEEDBACK ENABLED MAC PDU or HARQ FEEDBACK DISABLED MAC PDU

HARQ FEEDBACK ENABLED TB or HARQ FEEDBACK DISABLED TB

(maximum or minimum or average) number of SL sessions (operated (or operated) by UE)

-number of (maximum or minimum or average) bits/amount of information of SL HARQ feedback transmitted over (specific) PUCCH

(maximum or minimum or average) number of (last) PSFCH slots (correlated (feedback bundled) PSSCH slots) associated with (specific) PUCCH

-the (maximum or minimum or average) number of PSFCHs that need to be (simultaneously) received in order to configure PUCCH information (on the last PSFCH slot associated with PUCCH)

PUCCH-related HARQ codebook types (e.g., semi-static codebook, dynamic codebook)

PSFCH resource periods (related to resource pool)

Number of PUSCH symbols carrying PUCCH (related to PSFCH)

Number/position of DMRS symbols on PUSCH

MODE 1 dynamic license (DG)

MODE 1 configuration license (CG)

Maximum (or minimum or average) number of PSFCHs that a UE can receive/process simultaneously (e.g., UE capability)

Maximum (or minimum or average) number of PSFCHs that a UE can simultaneously transmit (e.g., UE capability)

(in the resource pool) (on the last PSFCH slot associated with PUCCH) SL slot related symbol (maximum or minimum or average) number

(in the resource pool) (on the last PSFCH slot associated with PUCCH) SL slot related symbol (maximum or minimum or average) position

(in the resource pool) (on the last PSFCH slot associated with PUCCH) PSSCH related symbol (maximum or minimum or average) number

(in the resource pool) (on the last PSFCH slot associated with PUCCH) PSSCH related symbol (maximum or minimum or average) position

Number of PSFCH symbols in SL slot (on last PSFCH slot associated with PUCCH)

Locations of PSFCH symbols in SL slot (on last PSFCH slot associated with PUCCH)

(resource pool related) (preconfigured) PSSCH DMRS time domain pattern

Maximum (or minimum or average) number of (selectable) PSSCH (time domain) DMRS (pattern) symbols

Position/index of last DMRS symbol in SL slot among- (selectable) PSSCH (time domain) DMRS (pattern) symbols

Whether or not to configure SL CSI-RS (in resource pool)

Whether or not to configure PT-RS (in resource pool)

Synchronization differences between Uu and SL communications (e.g., subframe boundary differences, slot boundary differences, symbol boundary differences, (starting point) differences between SFN 0 and DFN 0)

Whether the synchronization difference between Uu communication and SL communication exceeds a pre-configured (allowed) threshold value

- (PSFCH) SL parameter set

- (PUCCH) UL parameter set

-minimum value between SL parameter set and UL parameter set

Combination of SL parameter set and UL parameter set

For example, if the priority of the service/packet is relatively low (below a pre-configured threshold level), the value of X may be configured to be (relatively) large for the UE. For example, if the reliability requirements of the service/packet are relatively low (below a pre-configured threshold level), the value of X may be configured to be (relatively) large for the UE. For example, if the delay requirement of the service/packet is relatively long (longer than a pre-configured threshold), the value of X may be configured to be (relatively) large for the UE. For example, if the (SL) ACK/NACK feedback scheme is applied to the UE (as compared to the (SL) NACK ONLY feedback scheme), the value of X may be configured to be (relatively) large for the UE. For example, in the case of multicasting (as compared to unicasting), the value of X may be configured to be (relatively) large for the UE. For example, if the resource pool congestion level is low (below a pre-configured threshold), the value of X may be configured to be (relatively) large for the UE. For example, if the UE transmits HARQ FEEDBACK DISABLED MAC PDU/TB (as compared to HARQ FEEDBACK ENABLED MAC PDU/TB), the value of X may be configured to be (relatively) large for the UE.

For example, if the priority of the service/packet is relatively low (below a pre-configured threshold level), the value of X may be configured to be (relatively) small for the UE. For example, if the reliability requirements of the service/packet are relatively low (below a pre-configured threshold level), the value of X may be configured to be (relatively) small for the UE. For example, if the delay requirement of the service/packet is relatively long (longer than a pre-configured threshold), the value of X may be configured to be (relatively) small for the UE. For example, if the (SL) ACK/NACK feedback scheme is applied to the UE (as compared to the (SL) NACK ONLY feedback scheme), the value of X may be configured to be (relatively) small for the UE. For example, in the case of multicasting (as compared to unicasting), the value of X may be configured to be (relatively) small for the UE. For example, if the resource pool congestion level is low (below a pre-configured threshold), the value of X may be configured to be (relatively) small for the UE. For example, if the UE transmits HARQ FEEDBACK DISABLED MAC PDU/TB (as compared to HARQ FEEDBACK ENABLED MAC PDU/TB), the value of X may be configured to be (relatively) small for the UE.

For example, if the priority of the service/packet is relatively low (below a pre-configured threshold level), the UE may set/determine the value of X to be (relatively) large. For example, if the reliability requirements of the service/packet are relatively low (below a pre-configured threshold level), the UE may set/determine the value of X to be (relatively) large. For example, if the delay requirement of the service/packet is relatively long (longer than a pre-configured threshold), the UE may set/determine the value of X to be (relatively) large. For example, if the (SL) ACK/NACK feedback scheme is applied to the UE (as compared to the (SL) NACK ONLY feedback scheme), the UE may set/determine the value of X to be (relatively) large. For example, in the case of multicasting (as compared to unicasting), the UE may set/determine the value of X to be (relatively) large. For example, if the resource pool congestion level is low (below a pre-configured threshold), the UE may set/determine the value of X to be (relatively) large. For example, if the UE transmits HARQ FEEDBACK DISABLED MAC PDU/TB (as compared to HARQ FEEDBACK ENABLED MAC PDU/TB), the UE may set/determine the value of X to be (relatively) large.

For example, if the priority of the service/packet is relatively low (below a pre-configured threshold level), the UE may set/determine the value of X to be (relatively) small. For example, if the reliability requirements of the service/packet are relatively low (below a pre-configured threshold level), the UE may set/determine the value of X to be (relatively) small. For example, if the delay requirement of the service/packet is relatively long (longer than a pre-configured threshold), the UE may set/determine the value of X to be (relatively) small. For example, if the (SL) ACK/NACK feedback scheme is applied to the UE (as compared to the (SL) NACK ONLY feedback scheme), the UE may set/determine the value of X to be (relatively) small. For example, in the case of multicasting (as compared to unicasting), the UE may set/determine the value of X to be (relatively) smaller. For example, if the resource pool congestion level is low (below a pre-configured threshold), the UE may set/determine the value of X to be (relatively) small. For example, if the UE transmits HARQ FEEDBACK DISABLED MAC PDU/TB (as compared to HARQ FEEDBACK ENABLED MAC PDU/TB), the UE may set/determine the value of X to be (relatively) small.

For example, an index (CSAI) field value may be assigned for each counter side chain in DG DCI to configure the value of X differently or independently for a UE. For example, the CSAI field value may indicate how many (new) TB transmissions are scheduled (via DG DCI) by the base station on the (feedback bundle) PSSCH slot associated with the (last) PSFCH slot associated with the PUCCH.

For example, if the value of the CSAI field is relatively large, the value of X may be configured to be (relatively) large. For example, if the base station schedules a relatively large number of (new) TB transmissions (via DG DCI) on the (feedback bundle) PSSCH slot associated with the (last) PSFCH slot associated with PUCCH, the value of X may be configured to be (relatively) large for the UE. For example, the case where the CSAI field value is relatively large may include a case where the number of bits/information amount of SL HARQ feedback transmitted through the PUCCH increases. For example, the case where the value of the CSAI field is relatively large may include a case where the number of PSFCHs that the UE needs to (simultaneously) receive (on the last PSFCH slot associated with the PUCCH) is increased to configure PUCCH information.

For example, if the value of the CSAI field is relatively large, the value of X may be configured to be (relatively) small. For example, if the base station schedules a relatively large number of (new) TB transmissions (via DG DCI) on the (feedback bundle) PSSCH slot associated with the (last) PSFCH slot associated with PUCCH, the value of X may be configured to be (relatively) small for the UE.

For example, if the value of the CSAI field is relatively large, the UE may set/determine the value of X to be (relatively) large. For example, if the base station schedules a relatively large number of (new) TB transmissions (via DG DCI) on the (feedback bundle) PSSCH slot associated with the (last) PSFCH slot associated with PUCCH, the UE may set/determine the value of X to be (relatively) large.

For example, if the value of the CSAI field is relatively large, the UE may set/determine the value of X to be (relatively) small. For example, if the base station schedules a relatively large number of (new) TB transmissions (via DG DCI) on the (feedback bundle) PSSCH slot associated with the (last) PSFCH slot associated with PUCCH, the UE may set/determine the value of X to be (relatively) small.

For example, if the (maximum) number of bits/information amount of SL HARQ feedback transmitted over the (one) PUCCH is relatively increased, the value of X may be configured to be (relatively) large for the UE. For example, if the (maximum) number of (last) PSFCH slots (associated (feedback bundled) PSSCH slots) associated with the (one) PUCCH is relatively increased, the value of X may be configured to be (relatively) large for the UE. For example, if the (maximum) number of PSFCHs that need to be (simultaneously) received in order to configure PUCCH information (on the last PSFCH slot associated with PUCCH) is relatively increased, the value of X may be configured to be (relatively) large for the UE. For example, if a semi-static HARQ codebook is configured (as compared to a dynamic HARQ codebook), the value of X may be configured to be (relatively) large for the UE. For example, if the PSFCH resource period (in the resource pool) is configured to be relatively long, the value of X may be configured to be (relatively) large for the UE. For example, in the case of CG (as compared to MODE 1 DG), the value of X may be configured to be (relatively) large for the UE.

For example, if the (maximum) number of bits/information amount of SL HARQ feedback transmitted over the (one) PUCCH is relatively increased, the value of X may be configured to be (relatively) small for the UE. For example, if the (maximum) number of (last) PSFCH slots (associated (feedback bundled) PSSCH slots) associated with the (one) PUCCH is relatively increased, the value of X may be configured to be (relatively) smaller for the UE. For example, if the (maximum) number of PSFCHs that need to be (simultaneously) received in order to configure PUCCH information (on the last PSFCH slot associated with PUCCH) is relatively increased, the value of X may be configured to be (relatively) smaller for the UE. For example, if a semi-static HARQ codebook is configured (as compared to a dynamic HARQ codebook), the value of X may be configured to be (relatively) smaller for the UE. For example, if the PSFCH resource period (in the resource pool) is configured to be relatively long, the value of X may be configured to be (relatively) small for the UE. For example, in the case of CG (compared to MODE 1 DG), the value of X may be configured to be (relatively) smaller for the UE.

For example, if the (maximum) number of bits/information amount of SL HARQ feedback transmitted through the (one) PUCCH is relatively increased, the UE may set/determine the value of X to be (relatively) large. For example, if the (maximum) number of (last) PSFCH slots (associated (feedback bundled) PSSCH slots) associated with the (one) PUCCH is relatively increased, the UE may set/determine the value of X to be (relatively) large. For example, if the (maximum) number of PSFCHs that need to be (simultaneously) received in order to configure PUCCH information (on the last PSFCH slot associated with PUCCH) is relatively increased, the UE may set/determine the value of X to be (relatively) large. For example, if a semi-static HARQ codebook is configured (as compared to a dynamic HARQ codebook), the UE may set/determine the value of X to be (relatively) large. For example, if the PSFCH resource period (in the resource pool) is configured to be relatively long, the UE may set/determine the value of X to be (relatively) large. For example, in case of CG (compared to MODE 1 DG), the UE may set/determine the value of X to be (relatively) large.

For example, if the (maximum) number of bits/information amount of SL HARQ feedback transmitted through the (one) PUCCH is relatively increased, the UE may set/determine the value of X to be (relatively) small. For example, if the (maximum) number of (last) PSFCH slots (associated (feedback bundled) PSSCH slots) associated with the (one) PUCCH is relatively increased, the UE may set/determine the value of X to be (relatively) small. For example, if the (maximum) number of PSFCHs that need to be (simultaneously) received in order to configure PUCCH information (on the last PSFCH slot associated with PUCCH) is relatively increased, the UE may set/determine the value of X to be (relatively) small. For example, if a semi-static HARQ codebook is configured (as compared to a dynamic HARQ codebook), the UE may set/determine the value of X to be (relatively) smaller. For example, if the PSFCH resource period (in the resource pool) is configured to be relatively long, the UE may set/determine the value of X to be (relatively) small. For example, in case of CG (compared to MODE 1 DG), then the UE may set/determine the value of X to be (relatively) smaller.

For example, in case of a relatively small (maximum) number of UEs receiving/processing at the same time of the PSFCH, the value of X may be configured to be (relatively) large for the UE. For example, if the synchronization difference between Uu communication and SL communication is relatively large (greater than a pre-configured (allowed) threshold), the value of X may be configured to be (relatively) large for the UE.

For example, in case of a relatively small (maximum) number of UEs receiving/processing at the same time of the PSFCH, the value of X may be configured to be (relatively) small for the UE. For example, if the synchronization difference between Uu communication and SL communication is relatively large (greater than a pre-configured (allowed) threshold), the value of X may be configured to be (relatively) small for the UE.

For example, in case of a relatively small (maximum) number of UEs received/processed at the same time as the PSFCH, the UE may set/determine the value of X to be (relatively) large. For example, if the synchronization difference between Uu communication and SL communication is relatively large (greater than a pre-configured (allowed) threshold), the UE may set/determine the value of X to be (relatively) large.

For example, in case of a relatively small (maximum) number of UEs received/processed at the same time as the PSFCH, the UE may set/determine the value of X to be (relatively) small. For example, if the synchronization difference between Uu communication and SL communication is relatively large (greater than a pre-configured (allowed) threshold), the UE may set/determine the value of X to be (relatively) small.

2. Rule #B

For example, the UE may be configured to report information about a specific value preferred by the UE to the base station through preconfigured (UL) signaling (e.g., PUCCH, PUSCH). For example, the UE may transmit information about a specific value preferred by the UE to the base station through preconfigured (UL) signaling (e.g., PUCCH, PUSCH). For example, the UE may be configured to report information about a specific value preferred by the UE to the base station through a preconfigured information format (e.g., MAC CE, UCI). For example, the UE may transmit information about a specific value preferred by the UE to the base station through a preconfigured information format (e.g., MAC CE, UCI). Herein, for example, the information about the specific value may include the value of X, the value of N (reflecting/including the value of X (described in the present disclosure)) and/or T (in table 6 above) _prep At least one of the values of (a).

Herein, for example, particular values reported by the UE to the base station may be configured/specified for respective (PSFCH-related) SL parameter sets (e.g., subcarrier spacing, CP length, CP type). For example, particular values reported by the UE to the base station may be configured/specified for respective (PUCCH related) UL parameter sets. For example, the specific values reported by the UE to the base station may be configured/specified for respective minimum values between the SL parameter set and the UL parameter set. For example, particular values reported by the UE to the base station may be configured/specified for respective combinations of SL parameter sets and UL parameter sets. For example, the specific values reported to the base station by the UE may be configured/specified for the respective parameters described in rule #a. For example, the specific values reported to the base station by the UE may be configured/specified for the respective parameter combinations described in rule #a.

Based on the embodiments of the present disclosure, min_tgap (e.g., T _prep ). For example, if the difference between synchronization/timing related to base station (communication) and synchronization/timing related to SL (communication) is greater than a pre-configured threshold, min_tgap related to PUCCH transmission of UE may not be guaranteed (e.g., T _prep ). In this case, the following rule(s) may be applied.

For example, the UE may be configured not to perform PSFCH reception associated with SL HARQ information transmitted through the PUCCH. For example, the UE may not perform PSFCH reception associated with SL HARQ information transmitted through the PUCCH. For example, the UE may be configured not to perform PUCCH transmission related to the PSFCH. For example, the UE may not perform PUCCH transmission related to the PSFCH.

For example, based on a time interval/offset (hereinafter, act_tgap) between an end time of an actually allowed/available PSFCH reception and a start time of PUCCH (transmission), the UE may be configured to perform only a (maximum) number of PSFCH reception operations (hereinafter, act_pfnum) for which PUCCH transmission can be performed, or the UE may be configured to perform only a preconfigured number of PSFCH reception operations (for this case), or the UE may be configured to generate/process only a (maximum) SL HARQ bit number (hereinafter, act_hqbit) for which PUCCH transmission can be performed. For example, ACT TGAP may be less than or equal to MIN TGAP. For example, act_pfnum may be a value less than the UE capability value (reported to the base station). For example, act_pfnum may be less than or equal to the UE capability value (reported to the base station).

For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bit, the UE may be configured to preferentially select the PSFCH related to the service having a relatively high priority. For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bits, the UE may be configured to preferentially select the PSFCH related to a service having relatively strict QoS requirements (e.g., (high) reliability, (low) latency). For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bit, the UE may be configured to preferentially select the PSFCH including NACK information. For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bit, the UE may be configured to preferentially select the PSFCH including ACK information. For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bit, the UE may be configured to preferentially select the PSFCH related to the HARQ information of the NACK ONLY feedback scheme. For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bit, the UE may be configured to preferentially select the PSFCH related to the HARQ information of the ACK/NACK feedback scheme. For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bits, the UE may be configured to preferentially select the PSFCH related to unicast. For example, when the UE selects the act_pfnum PSFCH and/or the PSFCH related to the act_hqbit HARQ bits, the UE may be configured to preferentially select the PSFCH related to the multicast.

For example, the UE may be configured to transmit only the ACT TBNUM TB. For example, the UE may be configured to transmit the ACT TBNUM TB only on the PSSCH slot associated with the PUCCH-related PSFCH slot. For example, the number of acttbnum may be the number of PUCCH transmissions based on acttgap that can be performed. For example, the number of acttbnum may be a number that can satisfy actpfnum. For example, the number of acttbnum may be a number that can satisfy acthqbit.

For example, when the UE selects an ACT TBNUM TB, the UE may be configured to preferentially select TBs related to services having a relatively high priority. For example, when the UE selects an ACT TBNUM TB, the UE may be configured to preferentially select TBs related to services having relatively strict QoS requirements (e.g., (high) reliability, (low) latency). For example, when the UE selects an act_tbnum TB, the UE may be configured to preferentially select a TB related to NACK information. For example, when the UE selects an ACT TBNUM TB, the UE may be configured to preferentially select a TB related to ACK information. For example, when the UE selects an ACT TBNUM TB, the UE may be configured to preferentially select a TB related to HARQ information of a NACK ONLY feedback scheme. For example, when the UE selects an act_tbnum TB, the UE may be configured to preferentially select a TB related to HARQ information of an ACK/NACK feedback scheme. For example, when the UE selects an ACT TBNUM TB, the UE may be configured to preferentially select a TB related to unicast. For example, when the UE selects an ACT TBNUM TB, the UE may be configured to preferentially select a TB related to multicast.

For example, parameters related to the proposed method/rule(s) of the present disclosure (e.g., act_tgap, act_pfnum, act_hqibat, act_tbnum, etc.) and/or whether application parameters may be configured/restricted for the UE specifically for the service or differently or independently for each service. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the service type or differently or independently for each service type. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for (service) QoS requirements or differently or independently for individual (service) QoS requirements. For example, qoS requirements may include latency and/or reliability. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for (resource pool) congestion levels or differently or independently for individual (resource pool) congestion levels. For example, the congestion level may include CBR. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the resource pool or differently or independently for each resource pool. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the broadcast type or differently or independently for each broadcast type. For example, the broadcast type may include unicast, multicast, or broadcast. For example, the parameters and/or whether the parameters are applied may be configured/restricted for the UE specifically for the HARQ feedback scheme or differently or independently for each HARQ feedback scheme. For example, the HARQ feedback scheme may include an ACK/NACK feedback scheme or a NACK ONLY feedback scheme. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the SL operation mode or differently or independently for each SL operation mode. For example, the SL operating mode may include mode 1 or mode 2. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for MAC PDUs or differently or independently for individual MAC PDUs. For example, the MAC PDU may include HARQ FEEDBACK ENABLED MAC PDU or HARQ FEEDBACK DISABLED MAC PDU. For example, HARQ FEEDBACK ENABLED MAC PDU may be a MAC PDU composed of packets related to logical channels requiring HARQ feedback. For example, HARQ FEEDBACK DISABLED MAC PDU may be a MAC PDU composed of packets related to logical channels that do not require HARQ feedback. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the TBs or differently or independently for the respective TBs. For example, the TBs may include TBs requiring HARQ feedback or TBs not requiring HARQ feedback. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, specifically for the (maximum or minimum or average) number of SL sessions (operated (or operated) by the UE) or for the respective (maximum or minimum or average) number of SL sessions (operated (or operated) by the UE). For example, the parameters and/or whether the application parameters may be configured/limited for the UE differently or independently, specifically for a maximum (or minimum or average) number of PSFCHs that may be received/processed (or transmitted) by the UE (e.g., UE CAPABILITY) or for respective maximum (or minimum or average) numbers of PSFCHs that may be received/processed (or transmitted) by the UE (e.g., UE CAPABILITY). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for (resource pool related) PSFCH resource periods or differently or independently for each (resource pool related) PSFCH resource period. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently specifically for the number of bits/information of the SL HARQ feedback transmitted over the (specific) PUCCH or for the respective number of bits/information of the SL HARQ feedback transmitted over the (specific) PUCCH. For example, the bit number/information amount of the SL HARQ feedback may include a maximum bit number/information amount of the SL HARQ feedback, a minimum bit number/information amount of the SL HARQ feedback, or an average bit number/information amount of the SL HARQ feedback. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, specifically for the (maximum or minimum or average) number of (last) PSFCH slots (associated (feedback bundle) PSSCH slots) associated with the (specific) PUCCH or for the respective (maximum or minimum or average) number of (last) PSFCH slots (associated (feedback bundle) PSSCH slots) associated with the (specific) PUCCH. For example, the parameters and/or whether the application parameters may be configured/limited for the UE differently or independently for the (maximum or minimum or average) number of PSFCHs that need to be (simultaneously) received for configuring PUCCH information (on the last PSFCH slot associated with the PUCCH) or for the respective (maximum or minimum or average) number of PSFCHs that need to be (simultaneously) received for configuring PUCCH information (on the last PSFCH slot associated with the PUCCH). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, exclusively for the value of the counter side link assignment index field (on DG DCI) or for the respective value of the counter side link assignment index field (on DG DCI). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently for (in the resource pool) the (maximum or minimum or average) number/positions of the symbols related to the SL slot (on the last PSFCH slot associated with the PUCCH) or for the respective (maximum or minimum or average) number/positions of the symbols related to the SL slot (in the resource pool) (on the last PSFCH slot associated with the PUCCH). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently for (in the resource pool) the (maximum or minimum or average) number/positions of the PSSCH related symbols (on the last PSFCH slot associated with the PUCCH) or for the respective (maximum or minimum or average) number/positions of the PSSCH related symbols (in the resource pool) (on the last PSFCH slot associated with the PUCCH). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the number/position of PSFCH symbols in the SL slot (on the last PSFCH slot associated with the PUCCH) or for the respective number/position of PSFCH symbols in the SL slot (on the last PSFCH slot associated with the PUCCH) differently or independently. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the (pre-configured) PSSCH DMRS time domain pattern (related to the resource pool) or differently or independently for the respective (pre-configured) PSSCH DMRS time domain patterns (related to the resource pool). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, specifically for the maximum (or minimum or average) number of (selectable) PSSCH (time domain) DMRS (pattern) symbols or for the respective maximum (or minimum or average) number of (selectable) PSSCH (time domain) DMRS (pattern) symbols. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the position/index of the last DMRS symbol in a SL slot among (selectable) PSSCH (time domain) DMRS (pattern) symbols or for the respective positions/indexes of the last DMRS symbols in a SL slot among (selectable) PSSCH (time domain) DMRS (pattern) symbols differently or independently. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, specifically for whether to configure the SL CSI-RS (and/or PT-RS) or for (in the resource pool). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for or differently or independently for the synchronization difference between Uu and SL communications. For example, the synchronization difference between Uu communication and SL communication may include a subframe boundary difference, a slot boundary difference, a symbol boundary difference, or a (starting point) difference between SFN0 and DFN 0. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, specifically for whether the synchronization difference between Uu communication and SL communication exceeds a pre-configured (allowed) threshold or for whether the synchronization difference between Uu communication and SL communication exceeds a pre-configured (allowed) threshold. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the PUCCH-related HARQ codebook type or differently or independently for the respective PUCCH-related HARQ codebook type. For example, the PUCCH-related HARQ codebook type may include a semi-static codebook or a dynamic codebook. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the number of PUSCH symbols piggybacked onto PUCCH (related to PSFCH) or differently or independently for the respective number of PUSCH symbols piggybacked onto PUCCH (related to PSFCH). For example, the parameters and/or whether the application parameters may be configured/restricted for the UE differently or independently, specifically for the number/position of DMRS symbols on PUSCH or for the respective number/position of DMRS symbols on PUSCH. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the permissions or differently or independently for each permission. For example, the permissions may include mode 1DG or CG. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for (PSFCH) SL parameter sets or differently or independently for respective (PSFCH) SL parameter sets. For example, the parameter set may include a subcarrier spacing, a CP length, or a CP type. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the (PUCCH) UL parameter set or differently or independently for the respective (PUCCH) UL parameter set. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the minimum values of the UL and SL parameter sets or differently or independently for the respective minimum values of the UL and SL parameter sets. For example, the parameters and/or whether the application parameters may be configured/restricted for the UE specifically for the combination of UL and SL parameter sets or differently or independently for each combination of UL and SL parameter sets.

Based on embodiments of the present disclosure, when a TX UE receives a PSFCH (from its target RX UE), the TX UE may detect multiple PSFCH candidates related to different HARQ feedback information (e.g., ACK, NACK) with the same received power (above a pre-configured threshold). For example, when a TX UE receives a PSFCH (from its target RX UE), the TX UE may detect multiple PSFCH candidates related to different HARQ feedback information (e.g., ACK, NACK) with the same (peak) output (level) value associated with the PSFCH sequence. In the above case, the TX UE may be configured to (a) determine the corresponding PSFCH (always) as NACK information or ACK information, or (B) determine the corresponding PSFCH as information arbitrarily selected among ACK or NACK (or in a preconfigured order (e.g., NACK- > ACK- > NACK- >.)), or (C) determine the corresponding PSFCH as ACK or NACK information based on the sum (or average or minimum or maximum) of the PSFCH-related received powers (or PSFCH sequence-related (peak) output (level) values) being higher than a preconfigured threshold) being larger, or (D) determine the corresponding PSFCH as UE implementation. Herein, for example, when a UE receives a PSFCH (from its target RX UE), the UE may be configured to determine ACK information or NACK information based on the PSFCH having a relatively high received power (or PSFCH sequence-related (peak) output (level) value) (above a pre-configured threshold).

Fig. 13 illustrates a method for a first device to perform wireless communication, in accordance with an embodiment of the present disclosure. The embodiment of fig. 13 may be combined with various embodiments of the present disclosure.

Referring to fig. 13, in step S1310, the first device may receive information about Uplink (UL) resources for reporting a Side Link (SL) hybrid automatic repeat request (HARQ) feedback to the base station from the base station. In step S1320, the first device may transmit first side link control information (SCI) to the second device over a physical side link control channel (PSCCH). In step S1330, the first device may send a second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to the second device over a physical side link shared channel (PSSCH) associated with the PSCCH. In step S1340, the first device may determine a physical side chain feedback channel (PSFCH) resource based on the index of the subchannel and the index of the slot related to the PSSCH. In step S1350, the first device may transmit SL HARQ feedback for the MAC PDU to the base station based on the UL resource. For example, a minimum time gap between PSFCH resources and UL resources may be determined based on a parameter set of N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

For example, the priority may be the highest priority among at least one priority allowed by the SL grant allocated by the base station for transmission of the MAC PDU.

For example, X determined based on a low priority may be greater than X determined based on a high priority.

For example, X may be determined based on delay requirements, and X determined based on long delay requirements may be greater than X determined based on short delay requirements.

For example, X may be determined based on HARQ feedback options related to the MAC PDU, and the HARQ feedback options may be NACK feedback only options or ACK/NACK feedback options, and X determined based on the ACK/NACK feedback options may be greater than X determined based on the NACK feedback only options.

For example, X may be determined based on the PSFCH resource period, and X determined based on the long PSFCH resource period may be greater than X determined based on the short PSFCH resource period.

In addition, for example, the first device may report information to the base station regarding the first device's simultaneous processing capabilities for the PSFCH. Herein, for example, X may be determined based on the simultaneous processing capability of the first device for the PSFCH, and X determined based on the low simultaneous processing capability for the PSFCH may be greater than X determined based on the high simultaneous processing capability for the PSFCH.

For example, X may be determined based on a difference between a first synchronization related to Uu communication between the base station and the first device and a second synchronization related to SL communication between the first device and the second device, and X determined based on the large difference may be greater than X determined based on the small difference. In addition, for example, the first device may report information about the discrepancy to the base station.

In addition, for example, the first device may measure a Channel Busy Ratio (CBR) of the resource pool, and the first device may report information about the CBR to the base station. Herein, for example, X may be determined based on CBR, and X determined based on large CBR may be smaller than X determined based on small CBR.

For example, X may be determined based on a multicast type of the first device, and the multicast type may include multicast or unicast, and X determined based on multicast may be less than X determined based on unicast. In addition, for example, the first device may report information about the type of broadcast to the base station.

For example, the minimum time gap may be less than or equal to the time gap between UL resources and PSFCH resources.

For example, the UL resource may be related to at least one PSFCH resource, and the PSFCH resource may be a last PSFCH resource among the at least one PSFCH resource, and the SL HARQ feedback related to the last PSFCH resource may not be included in the SL HARQ feedback transmitted to the base station based on the minimum time gap being greater than a time gap between the UL resource and the PSFCH resource.

For example, based on multiple PSFCHs with the same received power detected on the PSFCH resource, it may be determined that the SL HARQ feedback is NACK.

The proposed method is applicable to devices according to various embodiments of the present disclosure. First, the processor 102 of the first device 100 may control the transceiver 106 to receive information from the base station regarding Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to the base station. In addition, the processor 102 of the first device 100 may control the transceiver 106 to transmit first side link control information (SCI) to the second device over a physical side link control channel (PSCCH). In addition, the processor 102 of the first device 100 may control the transceiver 106 to transmit the second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to the second device over a physical side link shared channel (PSSCH) associated with the PSCCH. In addition, the processor 102 of the first device 100 may determine physical side chain feedback channel (PSFCH) resources based on the index of the subchannel and the index of the slot associated with the PSSCH. In addition, the processor 102 of the first device 100 may control the transceiver 106 to transmit SL HARQ feedback for the MAC PDU to the base station based on the UL resources. For example, a minimum time gap between PSFCH resources and UL resources may be determined based on a parameter set of N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

Based on embodiments of the present disclosure, a first device adapted to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. For example, one or more processors may execute instructions to: receiving information on Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station from the base station; transmitting first side link control information (SCI) to a second device over a physical side link control channel (PSCCH); transmitting a second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to a second device over a physical side link shared channel (PSSCH) associated with a PSCCH; determining physical side chain feedback channel (PSFCH) resources based on an index of a subchannel and an index of a slot related to the PSSCH; and transmitting SL HARQ feedback for the MAC PDU to the base station based on the UL resource. For example, a minimum time gap between PSFCH resources and UL resources may be determined based on a parameter set of N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

An apparatus adapted to control a first User Equipment (UE) may be provided, based on embodiments of the present disclosure. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, one or more processors may execute instructions to: receiving information on Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station from the base station; transmitting first side link control information (SCI) to the second UE over a physical side link control channel (PSCCH); transmitting a second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to a second UE over a physical side link shared channel (PSSCH) associated with the PSCCH; determining physical side chain feedback channel (PSFCH) resources based on an index of a subchannel and an index of a slot related to the PSSCH; and transmitting SL HARQ feedback for the MAC PDU to the base station based on the UL resource. For example, a minimum time gap between PSFCH resources and UL resources may be determined based on a parameter set of N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information about priority.

Based on embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, may cause a first device to: receiving information on Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station from the base station; transmitting first side link control information (SCI) to a second device over a physical side link control channel (PSCCH); transmitting a second SCI and a Medium Access Control (MAC) Protocol Data Unit (PDU) to a second device over a physical side link shared channel (PSSCH) associated with a PSCCH; determining physical side chain feedback channel (PSFCH) resources based on an index of a subchannel and an index of a slot related to the PSSCH; and transmitting SL HARQ feedback for the MAC PDU to the base station based on the UL resource. For example, a minimum time gap between PSFCH resources and UL resources may be determined based on a parameter set of N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

Fig. 14 illustrates a method of a base station performing wireless communication according to an embodiment of the present disclosure. The embodiment of fig. 14 may be combined with various embodiments of the present disclosure.

Referring to fig. 14, in step S1410, the base station may transmit information about Uplink (UL) resources for reporting a Side Link (SL) hybrid automatic repeat request (HARQ) feedback to the base station to the first device. In step S1420, the base station may receive SL HARQ feedback for a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device based on the UL resource. For example, a MAC PDU may be transmitted by a first device to a second device through a physical side link control channel (PSSCH), and a physical side link feedback channel (PSFCH) resource may be determined based on an index of a subchannel and an index of a slot related to the PSSCH, and a minimum time gap between UL resources and PSFCH resources may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

The proposed method is applicable to devices according to various embodiments of the present disclosure. First, the processor 202 of the base station 200 may control the transceiver 206 to transmit information about Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to the base station to the first device. In addition, the processor 202 of the base station 200 may control the transceiver 206 to receive SL HARQ feedback for a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device based on the UL resources. For example, a MAC PDU may be transmitted by a first device to a second device through a physical side link control channel (PSSCH), and a physical side link feedback channel (PSFCH) resource may be determined based on an index of a subchannel and an index of a slot related to the PSSCH, and a minimum time gap between UL resources and PSFCH resources may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

Based on the embodiments of the present disclosure, a base station adapted to perform wireless communication may be provided. For example, the base station may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. For example, one or more processors may execute instructions to: transmitting, to a first device, information about Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station; and receiving SL HARQ feedback for a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device based on the UL resource. For example, a MAC PDU may be transmitted by a first device to a second device through a physical side link control channel (PSSCH), and a physical side link feedback channel (PSFCH) resource may be determined based on an index of a subchannel and an index of a slot related to the PSSCH, and a minimum time gap between UL resources and PSFCH resources may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

Based on the embodiments of the present disclosure, an apparatus adapted to control a base station may be provided. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, one or more processors may execute instructions to: transmitting information about Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station to a first User Equipment (UE); and receiving SL HARQ feedback for a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first UE based on the UL resource. For example, the MAC PDU may be transmitted to the second UE through a physical side link control channel (PSSCH) by the first UE, and a physical side link feedback channel (PSFCH) resource may be determined based on an index of a subchannel and an index of a slot related to the PSSCH, and a minimum time gap between UL resources and PSFCH resources may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of UL BWP, and X may be determined based on information related to priority.

Based on embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, may cause a base station to: transmitting, to a first device, information about Uplink (UL) resources for reporting Side Link (SL) hybrid automatic repeat request (HARQ) feedback to a base station; and receiving SL HARQ feedback for a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device based on the UL resource. For example, a MAC PDU may be transmitted by a first device to a second device through a physical side link control channel (PSSCH), and a physical side link feedback channel (PSFCH) resource may be determined based on an index of a subchannel and an index of a slot related to the PSSCH, and a minimum time gap between UL resources and PSFCH resources may be determined based on a parameter set of a N, X, SL bandwidth part (BWP) and a parameter set of UL BWP, and N may be determined based on a minimum value among the parameter set of SL BWP and the parameter set of ULBWP, and X may be determined based on information related to priority.

Based on various embodiments of the present disclosure, the time slots may be configured differently or independently based on parameters such as SL service related (most stringent) QoS requirements (e.g., latency, reliability), highest priority, amount of SL HARQ feedback information (to be transmitted over UL channels), congestion level (most recent) in the resource pool (reported to the base station), associated SL broadcast type(s) (UE interested and/or allowed in MODE1SL grant). For example, since the higher the CBR value, the higher the number of retransmissions required, the time gap may be configured to be smaller in order to guarantee the number of retransmissions within the remaining Packet Delay Budget (PDB). For example, in case there is a multicast of a larger number of target RX UEs, the time gap may be configured to be smaller, because the number of retransmissions required may be higher than unicast. For example, the value of X may be determined based on the highest priority of a logical channel used by the UE for a Scheduling Request (SR) or a Buffer Status Report (BSR). Thus, the problem of the UE implementation becoming complex to support nonsensical/useless capabilities may be solved.

The various embodiments of the present disclosure may be combined with each other.

Hereinafter, an apparatus to which various embodiments of the present disclosure may be applied will be described.

The various descriptions, functions, procedures, suggestions, methods and/or operational flows of the present disclosure described in this document may be applied to, but are not limited to, various fields requiring wireless communication/connection (e.g., 5G) between devices.

Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following figures/description, like reference numerals may refer to like or corresponding hardware, software, or functional blocks unless otherwise specified.

Fig. 15 shows a communication system 1 according to an embodiment of the present disclosure.

Referring to fig. 15, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a Base Station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a Radio Access Technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as a communication/radio/5G device. Wireless devices may include, but are not limited to, robots 100a, vehicles 100b-1, 100b-2, augmented reality (XR) devices 100c, handheld devices 100d, home appliances 100e, internet of things (IoT) devices 100f, and Artificial Intelligence (AI) devices/servers 400. For example, the vehicles may include vehicles having wireless communication functions, autonomous vehicles, and vehicles capable of performing inter-vehicle communication. Herein, a vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a head-mounted device (HMD), head-up display (HUD) mounted in a vehicle, television, smart phone, computer, wearable device, home appliance device, digital signage, vehicle, robot, or the like. Handheld devices may include smartphones, smartpads, wearable devices (e.g., smartwatches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS/network node with respect to other wireless devices.

Here, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include a narrowband internet of things for low power communication in addition to LTE, NR, and 6G. In this case, for example, the NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1 and/or LTE Cat NB2, not limited to the names described above. Additionally or alternatively, wireless communication techniques implemented in the wireless devices 100 a-100 f of the present disclosure may perform communications based on LTE-M techniques. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), and the like. For example, LTE-M technology may be implemented as at least any of various standards such as, but not limited to, 1) LTE CAT 0, 2) LTE CAT M1, 3) LTE CAT M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communications, and/or 7) LTE M. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of bluetooth, a Low Power Wide Area Network (LPWAN), and ZigBee in view of low power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a Personal Area Network (PAN) related to small/low power digital communication based on various standards including IEEE 802.15.4 and the like, and may be referred to as various names.

The wireless devices 100a to 100f may connect to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side-link communication) with each other without passing through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communications (e.g., vehicle-to-vehicle (V2V)/vehicle-to-everything (V2X) communications). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.

Wireless communication/ connection 150a, 150b, or 150c may be established between wireless devices 100a through 100f/BS 200 or BS 200/BS 200. Here, the wireless communication/connection may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, side link communication 150b (or D2D communication), or inter-BS communication (e.g., relay, access backhaul Integration (IAB)). The wireless device and BS/wireless device may transmit/receive radio signals to/from each other over wireless communication/ connections 150a and 150 b. For example, the wireless communication/ connections 150a and 150b may transmit/receive signals over various physical channels. To this end, at least a part of various configuration information configuration procedures for transmitting/receiving radio signals, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation procedures may be performed based on various proposals of the present disclosure.

Fig. 16 illustrates a wireless device in accordance with an embodiment of the present disclosure.

Referring to fig. 16, the first wireless device 100 and the second wireless device 200 may transmit radio signals through various RATs (e.g., LTE and NR). Herein, { first wireless device 100 and second wireless device 200} may correspond to { wireless device 100x and BS200} and/or { wireless device 100x and wireless device 100x } in fig. 15.

The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and/or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and/or transceiver(s) 106 and may be configured to implement the descriptions, functions, processes, proposals, methods and/or operational flows disclosed herein. For example, the processor(s) 102 may process the information in the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including the second information/signals through the transceiver 106 and then store information resulting from processing the second information/signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store various information related to the operation of the processor(s) 102. For example, the memory(s) 104 may store software code including instructions for performing part or all of the processing controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein. Here, the processor(s) 102 and the memory(s) 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through the antenna(s) 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver(s) 106 may be used interchangeably with Radio Frequency (RF) unit(s). In this disclosure, a wireless device may represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and/or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and/or transceiver(s) 206 and may be configured to implement the descriptions, functions, processes, proposals, methods and/or operational flows disclosed herein. For example, the processor(s) 202 may process the information in the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information resulting from processing the fourth information/signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store various information related to the operation of the processor(s) 202. For example, memory(s) 204 may store software code including instructions for performing part or all of the processing controlled by processor(s) 202 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein. Here, the processor(s) 202 and the memory(s) 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through the antenna(s) 208. Each transceiver 206 can include a transmitter and/or a receiver. The transceiver(s) 206 may be used interchangeably with RF unit(s). In this disclosure, a wireless device may represent a communication modem/circuit/chip.

The hardware elements of wireless devices 100 and 200 will be described in more detail below. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more of processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods and/or operational flows disclosed herein. One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational procedures disclosed herein and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational procedures disclosed herein.

One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures or functions. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, driven by one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flows disclosed in this document may be implemented using software or firmware in the form of codes, commands and/or command sets.

One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, code, instructions, and/or commands. One or more of the memories 104 and 204 may be comprised of read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drives, registers, cash memory, a computer-readable storage medium, and/or combinations thereof. The one or more memories 104 and 204 may be located internal and/or external to the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 by various techniques such as wired or wireless connections.

One or more transceivers 106 and 206 may transmit the user data, control information, and/or radio signals/channels mentioned in the methods and/or operational flows of this document to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flows disclosed herein from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein through one or more antennas 108 and 208. In this document, the one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels, etc. from RF band signals to baseband signals to process the received user data, control information, radio signals/channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may comprise (analog) oscillators and/or filters.

Fig. 17 shows a signal processing circuit for transmitting a signal according to an embodiment of the present disclosure.

Referring to fig. 17, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. The operations/functions of fig. 17 may be performed without limitation to the processors 102, 202 and/or transceivers 106, 206 of fig. 16. The hardware elements of fig. 17 may be implemented by the processors 102, 202 and/or transceivers 106, 206 of fig. 16. Blocks 1010 through 1060 may be implemented, for example, by processors 102, 202 of fig. 16. Alternatively, blocks 1010 through 1050 may be implemented by the processors 102, 202 of fig. 16, and block 1060 may be implemented by the transceivers 106, 206 of fig. 16.

The codeword may be converted into a radio signal via the signal processing circuit 1000 of fig. 17. Herein, a codeword is a coded bit sequence of an information block. The information blocks may include transport blocks (e.g., UL-SCH transport blocks, DL-SCH transport blocks). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

In particular, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initial value, and the initial value may include ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by modulator 1020. The modulation scheme may include pi/2-binary phase shift keying (pi/2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence may be mapped to one or more transport layers by layer mapper 1030. The modulation symbols for each transport layer may be mapped (precoded) to the corresponding antenna port(s) by precoder 1040. The output z of the precoder 1040 may be derived by multiplying the output y of the layer mapper 1030 by an N x M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

The resource mapper 1050 may map the modulation symbols for each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and a plurality of subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be transmitted to other devices through each antenna. To this end, the signal generator 1060 may include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

The signal processing for the signals received in the wireless device may be configured in a manner that is inverse to the signal processing 1010-1060 of fig. 17. For example, a wireless device (e.g., 100, 200 of fig. 16) may receive radio signals from outside through an antenna port/transceiver. The received radio signal may be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. The baseband signal may then be recovered into codewords by a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword may be restored to the original information block by decoding. Accordingly, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post encoder, a demodulator, a descrambler, and a decoder.

Fig. 18 illustrates another example of a wireless device in accordance with an embodiment of the present disclosure. The wireless device may be implemented in various forms according to use cases/services (refer to fig. 15).

Referring to fig. 18, a wireless device 100, 200 may correspond to the wireless device 100, 200 of fig. 16 and may be configured by various elements, components, units/portions and/or modules. For example, each of the wireless devices 100, 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include communication circuitry 112 and transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102, 202 and/or one or more memories 104, 204 of fig. 16. For example, the transceiver(s) 114 may include one or more transceivers 106, 206 and/or one or more antennas 108, 208 of fig. 16. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface in the memory unit 130.

The add-on component 140 may be variously configured depending on the type of wireless device. For example, the additional component 140 may include at least one of a power unit/battery, an input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented in, but is not limited to, the following form: robot (100 a of fig. 15), vehicle (100 b-1 and 100b-2 of fig. 15), XR device (100 c of fig. 15), handheld device (100 d of fig. 15), home appliance (100 e of fig. 15), ioT device (100 f of fig. 15), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, financial science and technology device (or financial device), security device, climate/environment device, AI server/device (400 of fig. 15), BS (200 of fig. 15), network node, etc. Depending on the use case/service, the wireless device may be used in a mobile or stationary location.

In fig. 18, various elements, components, units/portions and/or modules in the wireless devices 100, 200 may all be connected to each other through wired interfaces, or at least portions thereof may be connected wirelessly through the communication unit 110. For example, in each of the wireless devices 100, 200, the control unit 120 and the communication unit 110 may be connected by a wire, and the control unit 120 and the first unit (e.g., 130, 140) may be connected wirelessly by the communication unit 110. Each element, component, unit/section and/or module within the wireless device 100, 200 may also include one or more elements. For example, the control unit 120 may be constructed by a set of one or more processors. As an example, the control unit 120 may be constructed by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphic processing unit, and a memory control processor. As another example, the memory 130 may be constructed from Random Access Memory (RAM), dynamic RAM (DRAM), read Only Memory (ROM), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.

Hereinafter, an example of implementing fig. 18 will be described in detail with reference to the accompanying drawings.

Fig. 19 illustrates a handheld device in accordance with an embodiment of the present disclosure. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a Mobile Station (MS), a User Terminal (UT), a mobile subscriber station (MSs), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

Referring to fig. 19, the handheld device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I/O unit 140c. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 through 130/140a through 140c correspond to blocks 110 through 130/140, respectively, of fig. 18.

The communication unit 110 may transmit and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling constituent elements of the handheld device 100. The control unit 120 may include an Application Processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands required to drive the handheld device 100. The memory unit 130 may store input/output data/information. The power supply unit 140a may supply power to the handheld device 100 and include wired/wireless charging circuits, batteries, and the like. The interface unit 140b may support connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., an audio I/O port and a video I/O port) for connection with external devices. The I/O unit 140c may input or output video information/signals, audio information/signals, data, and/or information input by a user. The I/O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.

For example, in the case of data communication, the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, image, or video) input by the user, and the acquired information/signals may be stored in the memory unit 130. The communication unit 110 may convert information/signals stored in the memory into radio signals and transmit the converted radio signals directly to other wireless devices or to the BS. The communication unit 110 may receive radio signals from other wireless devices or BSs and then restore the received radio signals to original information/signals. The recovered information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, image, video, or haptic) through the I/O unit 140.

Fig. 20 illustrates a vehicle or autonomous vehicle in accordance with an embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aircraft (AV), a ship, or the like.

Referring to fig. 20, the vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130/140a through 140d correspond to blocks 110/130/140, respectively, of FIG. 18.

The communication unit 110 may transmit and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gnbs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomously driven vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The drive unit 140a may cause the vehicle or the autonomous driving vehicle 100 to travel on the road. The drive unit 140a may include an engine, motor, transmission, wheels, brakes, steering devices, etc. The power supply unit 140b may supply power to the vehicle or the autonomous driving vehicle 100, and may include a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c may acquire a vehicle state, external environment information, user information, and the like. The sensor unit 140c may include an Inertial Measurement Unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a gradient sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, and the like. The autonomous driving unit 140d may implement a technique for keeping a lane in which the vehicle is traveling, a technique for automatically adjusting a speed (e.g., adaptive cruise control), a technique for autonomously driving along a determined path, a technique for driving by automatically setting a path in the case where a destination is set, and the like.

For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a such that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to a driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically/periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. In between autonomous driving, the sensor unit 140c may acquire vehicle state and/or ambient information. The autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly acquired data/information. The communication unit 110 may transmit information about the vehicle position, the autonomous driving path, and/or the driving plan to an external server. The external server may predict traffic information data using AI technology or the like based on information collected from the vehicle or the autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

The claims in this specification may be combined in various ways. For example, the technical features in the method claims of the present specification may be combined to be implemented or performed in an apparatus, and the technical features in the apparatus claims may be combined to be implemented or performed in a method. In addition, the technical features in the method claim(s) and the apparatus claim(s) may be combined to be implemented or performed in the apparatus. In addition, technical features in the method claim(s) and the apparatus claim(s) may be combined to be implemented or performed in the method.

Claims (20)

1. A method for performing wireless communication by a first device, the method comprising the steps of:

receiving information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to a base station from the base station;

transmitting first side link control information SCI to the second device over a physical side link control channel PSCCH;

transmitting a second SCI and a medium access control MAC protocol data unit PDU to the second device over a physical side chain shared channel PSSCH associated with the PSCCH;

determining physical side chain feedback channel, PSFCH, resources based on an index of a subchannel and an index of a slot associated with the PSSCH; and

Transmitting the SL HARQ feedback for the MAC PDU to the base station based on the UL resource,

wherein a minimum time gap between the PSFCH resource and the UL resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

2. The method of claim 1, wherein the priority is a highest priority among at least one priority allowed by the base station for SL grants allocated for transmission of the MAC PDU.

3. The method of claim 1, wherein X determined based on low priority is greater than X determined based on high priority.

4. The method of claim 1, wherein X is determined based on latency requirements, and

wherein X, which is determined based on the long latency requirement, is greater than X, which is determined based on the short latency requirement.

5. The method of claim 1, wherein X is determined based on HARQ feedback options related to the MAC PDU,

wherein the HARQ feedback option is a NACK-only feedback option or an ACK/NACK feedback option, and

Wherein X determined based on the ACK/NACK feedback option is greater than X determined based on the NACK feedback option only.

6. The method of claim 1, wherein X is determined based on a PSFCH resource period, and

wherein X determined based on the long PSFCH resource period is greater than X determined based on the short PSFCH resource period.

7. The method of claim 1, further comprising the step of:

reporting information about the simultaneous processing capability of the first device for the PSFCH to the base station,

wherein X is determined based on the concurrent processing capability of the first device for the PSFCH, an

Wherein X determined based on the low simultaneous processing capability of the PSFCH is greater than X determined based on the high simultaneous processing capability of the PSFCH.

8. The method of claim 1, wherein X is determined based on a difference between a first synchronization related to Uu communication between the base station and the first device and a second synchronization related to SL communication between the first device and the second device, and

wherein X determined based on the large variance is greater than X determined based on the small variance.

9. The method of claim 1, further comprising the step of:

Measuring a channel busy ratio CBR of the resource pool; and

reporting information about the CBR to the base station,

wherein X is determined based on the CBR, and

wherein X determined based on the large CBR is smaller than X determined based on the small CBR.

10. The method of claim 1, wherein X is determined based on a broadcast type of the first device,

wherein the broadcast type includes multicast or unicast, and

wherein X determined based on the multicast is less than X determined based on the unicast.

11. The method of claim 1, wherein the minimum time gap is less than or equal to a time gap between the UL resource and the PSFCH resource.

12. The method of claim 1, wherein the UL resource relates to at least one PSFCH resource,

wherein the PSFCH resource is a last PSFCH resource among the at least one PSFCH resource, and

wherein SL HARQ feedback related to the last PSFCH resource is not included in the SL HARQ feedback transmitted to the base station based on the minimum time gap being greater than a time gap between the UL resource and the PSFCH resource.

13. The method of claim 1, wherein the SL HARQ feedback is determined to be a NACK based on detecting multiple PSFCHs with the same received power on the PSFCH resources.

14. A first device arranged to perform wireless communication, the first device comprising:

one or more memories storing instructions;

one or more transceivers; and

one or more processors coupled to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:

receiving information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to a base station from the base station;

transmitting first side link control information SCI to the second device over a physical side link control channel PSCCH;

transmitting a second SCI and a medium access control MAC protocol data unit PDU to the second device over a physical side chain shared channel PSSCH associated with the PSCCH;

determining physical side chain feedback channel, PSFCH, resources based on an index of a subchannel and an index of a slot associated with the PSSCH; and is also provided with

Transmitting the SL HARQ feedback for the MAC PDU to the base station based on the UL resource,

wherein a minimum time gap between the PSFCH resource and the UL resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

Wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

15. An apparatus arranged to control a first user equipment, UE, the apparatus comprising:

one or more processors; and

one or more memories operatively connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:

receiving information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to a base station from the base station;

transmitting first side link control information SCI to the second UE over a physical side link control channel PSCCH;

transmitting a second SCI and a medium access control MAC protocol data unit PDU to the second UE over a physical side link shared channel PSSCH associated with the PSCCH;

determining physical side chain feedback channel, PSFCH, resources based on an index of a subchannel and an index of a slot associated with the PSSCH; and is also provided with

Transmitting the SL HARQ feedback for the MAC PDU to the base station based on the UL resource,

Wherein a minimum time gap between the PSFCH resource and the UL resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

16. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to:

receiving information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to a base station from the base station;

transmitting first side link control information SCI to the second device over a physical side link control channel PSCCH;

transmitting a second SCI and a medium access control MAC protocol data unit PDU to the second device over a physical side chain shared channel PSSCH associated with the PSCCH;

determining physical side chain feedback channel, PSFCH, resources based on an index of a subchannel and an index of a slot associated with the PSSCH; and is also provided with

Transmitting the SL HARQ feedback for the MAC PDU to the base station based on the UL resource,

Wherein a minimum time gap between the PSFCH resource and the UL resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

17. A method for performing wireless communication by a base station, the method comprising the steps of:

transmitting information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to the base station to a first device; and

receiving the SL HARQ feedback for a medium access control MAC protocol data unit PDU from the first device based on the UL resource,

wherein the MAC PDU is transmitted by the first device to a second device through a physical side link control channel PSSCH,

wherein the physical side link feedback channel PSFCH resources are determined based on an index of a subchannel and an index of a slot associated with the PSSCH,

wherein a minimum time gap between the UL resource and the PSFCH resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

Wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

18. A base station configured to perform wireless communication, the base station comprising:

one or more memories storing instructions;

one or more transceivers; and

one or more processors coupled to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:

transmitting information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to the base station to a first device; and is also provided with

Receiving the SL HARQ feedback for a medium access control MAC protocol data unit PDU from the first device based on the UL resource,

wherein the MAC PDU is transmitted by the first device to a second device through a physical side link control channel PSSCH,

wherein the physical side link feedback channel PSFCH resources are determined based on an index of a subchannel and an index of a slot associated with the PSSCH,

Wherein a minimum time gap between the UL resource and the PSFCH resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

19. An apparatus arranged to control a base station, the apparatus comprising:

one or more processors; and

one or more memories operatively connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:

transmitting information about uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to the base station to a first user equipment, UE; and is also provided with

Receiving the SL HARQ feedback for a medium access control MAC protocol data unit PDU from the first UE based on the UL resource,

wherein the MAC PDU is transmitted by the first UE to a second UE through a physical side link control channel PSSCH,

wherein the physical side link feedback channel PSFCH resources are determined based on an index of a subchannel and an index of a slot associated with the PSSCH,

Wherein a minimum time gap between the UL resource and the PSFCH resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

20. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a base station to:

transmitting information on uplink, UL, resources for reporting side link, SL, hybrid automatic repeat request, HARQ, feedback to the base station to a first device; and is also provided with

Receiving the SL HARQ feedback for a medium access control MAC protocol data unit PDU from the first device based on the UL resource,

wherein the MAC PDU is transmitted by the first device to a second device through a physical side link control channel PSSCH,

wherein the physical side link feedback channel PSFCH resources are determined based on an index of a subchannel and an index of a slot associated with the PSSCH,

wherein a minimum time gap between the UL resource and the PSFCH resource is determined based on a parameter set of N, X, SL bandwidth portion BWP and a parameter set of UL BWP,

Wherein N is determined based on the minimum value among the parameter set of the SL BWP and the parameter set of the UL BWP, and

wherein X is determined based on information about the priority.

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