WO2018174688A1 - 복수의 반송파들이 설정된 단말의 전력 할당 방법 및 상기 방법을 이용하는 단말 - Google Patents
복수의 반송파들이 설정된 단말의 전력 할당 방법 및 상기 방법을 이용하는 단말 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
Definitions
- the present invention relates to wireless communication, and more particularly, to a power allocation method of a terminal in which a plurality of carriers are set and a terminal using the method.
- D2D Device-to-Device
- D2D is drawing attention as a communication technology for a public safety network.
- Public safety networks have higher service requirements (reliability and security) than commercial communication networks, and require direct signal transmission and reception, or D2D operation, between devices, especially when cellular coverage is not available or available. .
- the D2D operation may have various advantages in that it transmits and receives signals between adjacent devices.
- the D2D user equipment has a high data rate and low delay and can perform data communication.
- the D2D operation may distribute traffic congested at the base station, and may also serve to extend the coverage of the base station if the D2D terminal serves as a relay.
- an interface used for D2D operation that is, an interface between a terminal and a terminal is called a sidelink
- the sidelink is a terminal between terminals installed in vehicles or in a vehicle. It can also be used for communication between a terminal and another terminal, that is, vehicle-to-everything (V2X).
- V2X vehicle-to-everything
- the sidelink communication may transmit control signals, data, and the like while maintaining a transmission time interval (TTI) in an existing system, or may transmit control signals, data, and the like, using a shorter TTI than the existing system.
- TTI transmission time interval
- one of the control signals and data may be transmitted using an existing TTI and the other using the short TTI.
- a control signal may be transmitted using one TTI among various TTIs shorter than the existing TTI, and data may be transmitted using any other TTI.
- the various signal transmission schemes may be independently set for each carrier.
- This operation is a new operation that does not exist previously, and thus, it may be a problem how to allocate transmission power for each carrier.
- the present invention has been made in an effort to provide a method for allocating power of a terminal having a plurality of carriers configured thereon and a terminal using the method.
- a method of allocating a power of a terminal configured with a plurality of carriers determines a representative transmission time interval (TTI) of a first carrier, determines a representative TTI of a second carrier, and determines a representative TTI length of the first carrier and a representative TTI length of the second carrier. Based on the present invention, after the first transmission power is allocated to the first carrier, the second transmission power is allocated to the second carrier.
- TTI transmission time interval
- the representative TTI length of the first carrier may be shorter than the representative TTI length of the second carrier.
- the first transmit power may be greater than the second transmit power.
- the representative TTI length of one carrier may be determined as the maximum value of n and m.
- the representative TTI length of one carrier may be determined as the minimum value among the n and m.
- the first transmission power and the second transmission power are priorities for each packet of signals transmitted in the representative TTI length of the first carrier and the representative TTI length of the second carrier, the first carrier and the second carrier, respectively. (priority per packet) and channel busy ratio (CBR) can be allocated.
- the number of symbols for transmitting a physical sidelink control channel (PSCCH) on the first carrier is n (n is a natural number), the number of symbols on which a physical sidelink shared channel (PSSCH) is transmitted is m (m is a natural number), and m is If greater than n, the PSSCH may be transmitted at a constant transmit power in the m symbols.
- the PSCCH and the PSSCH may be frequency division multiplexed (FDM).
- FDM frequency division multiplexed
- the number of symbols for transmitting a physical sidelink control channel (PSCCH) on the first carrier is n (n is a natural number), the number of symbols on which a physical sidelink shared channel (PSSCH) is transmitted is m (m is a natural number), and m is If greater than n, the transmit power of the PSSCH transmitted in the n symbols and the transmit power of the PSSCH transmitted in the mn symbols may be different.
- Information indicating a difference or a ratio between the transmission power of the PSSCH transmitted in the n symbols and the transmission power of the PSSCH transmitted in the m-n symbols may be received through the PSCCH.
- the first carrier and the second carrier may be included in the plurality of carriers.
- a terminal in another aspect, includes a transceiver for transmitting and receiving a radio signal and a processor operatively coupled to the transceiver, wherein the processor comprises a representative transmission time interval (TTI) of a first carrier.
- TTI transmission time interval
- Determine the representative TTI of the second carrier and allocate a first transmission power to the first carrier based on the representative TTI length of the first carrier and the representative TTI length of the second carrier, And a second transmission power is allocated to the second carrier.
- a representative TTI for each carrier is determined, and transmission power for each carrier is allocated based on the representative TTI value of each carrier. Since the transmission power for each carrier is determined in consideration of the TTI for each carrier, reliability of signal transmission can be improved. For example, when higher transmission power is allocated to a carrier using a short TTI, transmission reliability of a signal transmitted on the carrier can be increased. In addition, since any carrier uses various TTIs, transmission power is allocated based on a representative TTI, thereby reducing complexity.
- 1 shows a wireless communication system.
- FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
- FIG. 3 is a block diagram illustrating a radio protocol structure for a control plane.
- 5 shows an example of transmission of a PSCCH and a PSSCH.
- FIG. 6 shows a transmission power determination method according to an embodiment of the present invention.
- FIG. 7 shows a transmission power allocation method of a terminal according to an embodiment of the present invention.
- FIG. 10 is a block diagram illustrating an apparatus in which an embodiment of the present invention is implemented.
- FIG 11 illustrates an example of configuring the processor 1100.
- 1 shows a wireless communication system.
- the wireless communication system may be called, for example, an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), or a Long Term Evolution (LTE) / LTE-A system.
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- LTE Long Term Evolution
- the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
- the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
- the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
- eNB evolved-NodeB
- BTS base transceiver system
- access point and the like.
- the base stations 20 may be connected to each other through an X2 interface.
- the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
- S-GW Serving Gateway
- MME Mobility Management Entity
- EPC Evolved Packet Core
- EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
- the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
- S-GW is a gateway having an E-UTRAN as an endpoint
- P-GW is a gateway having a PDN as an endpoint.
- Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
- L2 second layer
- L3 third layer
- the RRC Radio Resource Control
- the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
- the wireless communication system may be a time division duplex (TDD) system, a frequency division duplex (FDD) system, or a system in which TDD and FDD are used together.
- TDD time division duplex
- FDD frequency division duplex
- FIG. 2 is a block diagram showing a radio protocol architecture for a user plane
- FIG. 3 is a block diagram showing a radio protocol architecture for a control plane.
- the user plane is a protocol stack for user data transmission
- the control plane is a protocol stack for control signal transmission.
- a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
- the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
- MAC medium access control
- the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
- OFDM orthogonal frequency division multiplexing
- the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
- the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
- RLC Radio Link Control
- RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
- QoS Quality of Service
- the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
- TM transparent mode
- UM unacknowledged mode
- Acknowledged Mode acknowledged mode
- AM Three modes of operation (AM).
- AM RLC provides error correction through an automatic repeat request (ARQ).
- the RRC (Radio Resource Control) layer is defined only in the control plane.
- the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
- RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
- PDCP Packet Data Convergence Protocol
- Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
- the functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transfer of control plane data and encryption / integrity protection.
- the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
- RB can be further divided into SRB (Signaling RB) and DRB (Data RB).
- SRB is used as a path for transmitting RRC messages in the control plane
- DRB is used as a path for transmitting user data in the user plane.
- the UE If 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 state, otherwise it is in an RRC idle state.
- the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
- RACH random access channel
- SCH uplink shared channel
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH multicast control channel
- MTCH multicast traffic
- the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
- One sub-frame consists of a plurality of OFDM symbols in the time domain.
- the RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers.
- each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
- Transmission Time Interval is a unit time of subframe transmission.
- the RRC state refers to whether or not the RRC layer of the UE is in a logical connection with the RRC layer of the E-UTRAN. If connected, the RRC connected state (RRC_CONNECTED), if not connected, the RRC idle state ( RRC_IDLE). Since the UE in the RRC connected state has an RRC connection, the E-UTRAN can grasp the existence of the corresponding UE in a cell unit, and thus can effectively control the UE. On the other hand, the UE of the RRC idle state cannot be understood by the E-UTRAN, and is managed by the CN (core network) in units of a tracking area, which is a larger area unit than the cell. That is, the UE in the RRC idle state is identified only in a large area unit, and must move to the RRC connected state in order to receive a normal mobile communication service such as voice or data.
- CN core network
- the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in an RRC idle state in the cell.
- the UE in the RRC idle state needs to establish an RRC connection, it establishes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC connected state.
- RRC connection procedure There are several cases in which the UE in RRC idle state needs to establish an RRC connection. For example, an uplink data transmission is necessary due to a user's call attempt, or a paging message is sent from E-UTRAN. If received, a response message may be sent.
- the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
- EMM-REGISTERED EPS Mobility Management-REGISTERED
- EMM-DEREGISTERED EMM-DEREGISTERED
- the initial terminal is in the EMM-DEREGISTERED state, and the terminal performs a process of registering with the corresponding network through an initial attach procedure to access the network. If the attach procedure is successfully performed, the UE and the MME are in the EMM-REGISTERED state.
- an EPS Connection Management (ECM) -IDLE state In order to manage a signaling connection between the UE and the EPC, two states are defined, an EPS Connection Management (ECM) -IDLE state and an ECM-CONNECTED state, and these two states are applied to the UE and the MME.
- ECM EPS Connection Management
- ECM-IDLE state When the UE in the ECM-IDLE state establishes an RRC connection with the E-UTRAN, the UE is in the ECM-CONNECTED state.
- the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes an S1 connection with the E-UTRAN.
- the E-UTRAN does not have context information of the terminal.
- the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
- a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
- the terminal when the terminal is in the ECM-CONNECTED state, the mobility of the terminal is managed by the command of the network.
- the terminal In the ECM-IDLE state, if the position of the terminal is different from the position known by the network, the terminal informs the network of the corresponding position of the terminal through a tracking area update procedure.
- ProSe proximity based services
- ProSe has ProSe communication and ProSe direct discovery.
- ProSe direct communication refers to communication performed between two or more neighboring terminals.
- the terminals may perform communication using a user plane protocol.
- ProSe-enabled UE refers to a terminal that supports a procedure related to the requirements of ProSe.
- ProSe capable terminals include both public safety UEs and non-public safety UEs.
- the public safety terminal is a terminal that supports both a public safety-specific function and a ProSe process.
- a non-public safety terminal is a terminal that supports a ProSe process but does not support a function specific to public safety.
- ProSe direct discovery is a process for ProSe capable terminals to discover other ProSe capable terminals that are adjacent to each other, using only the capabilities of the two ProSe capable terminals.
- EPC-level ProSe discovery refers to a process in which an EPC determines whether two ProSe capable terminals are in proximity and informs the two ProSe capable terminals of their proximity.
- ProSe direct communication may be referred to as D2D communication
- ProSe direct discovery may be referred to as D2D discovery
- the link used for D2D operation is called sidelink in LTE.
- V2X vehicle to everything communication.
- V2X means communication between a terminal installed in a vehicle and another terminal, and the other terminal may be a pedestrian, a vehicle, or an infrastructure, and in this case, a vehicle to pedestrian (V2P), a vehicle to vehicle (V2V), and a vehicle to vehicle (V2I) to infrastructure).
- V2P vehicle to pedestrian
- V2V vehicle to vehicle
- V2I vehicle to vehicle
- data / control information may be transmitted and received through a sidelink defined in a D2D operation rather than an uplink / downlink link between a base station and a terminal used in the existing LTE communication.
- the following physical channels may be defined in the sidelink.
- PSBCH Physical Sidelink Broadcast CHannel
- Physical Sidelink Control CHannel (PSCCH) is a physical sidelink control channel.
- PSDS Physical Sidelink Discovery CHannel
- PSSCH Physical Sidelink Shared CHannel
- SSS Sidelink Synchronization Signal
- SLSS is a sidelink synchronization signal.
- SLSS may include a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS).
- PSSS Primary Sidelink Synchronization Signal
- SSSS Secondary Sidelink Synchronization Signal
- the sidelink may mean an interface between the terminal and the terminal, and the sidelink may correspond to the PC5 interface.
- V2X communication may support PC5-based information exchange operation (interfaces), which is an interface between UEs, and as shown in FIG. 4 (b), the base station (eNodeB) and the UE It may also support a Uu-based elaboration exchange operation between terminals (UE).
- PC5 and Uu may be used to support information exchange operations (between terminals).
- the proposed schemes below are methods for efficiently operating transmission power control when V2X communication based on a relatively short transmission time interval (TRANSMISSION TIME INTERVAL) is performed compared to the conventional (for example, "1 ms (milliseconds)").
- a transmission time interval shorter than the existing 1 ms is called an S-TTI
- an existing transmission time interval of 1 ms is called an L-TTI.
- a variable TTI may be introduced in consideration of traffic (or data) such as various transmission coverage / reliability / delay requirements.
- a TTI data related channel / signal transmission of a specific requirement
- BASIC RESOURCE UNIT basic resource unit
- a TTI data related channel / signal transmission of a specific requirement
- S-TTI pre-set (/ signaled) base resource unit
- the L-TTI is a combination of K S-TTIs (pre-set). It can be interpreted in the form.
- the S-TTI is defined as K (pre-set (/ signaled)) L-TTIs (/ signaled).
- K pre-set (/ signaled)
- L-TTIs L-TTIs (/ signaled).
- the S-TTI may also have a form in which a plurality of (pre-signed) basic resource units are combined.
- the V2X communication mode is typically a mode in which a base station signals (/ controls) scheduling information related to V2X message transmission (/ reception) on a V2X resource pool previously set (/ signaled) from a base station (/ network).
- B mode
- B a mode in which a UE independently determines (/ controls) V2X message transmission (/ reception) related scheduling information on a V2X resource pool previously set (/ signaled) from a base station (/ network) ( This may be referred to as mode # 4).
- Mode # 3 may be, for example, a terminal located within a base station communication coverage, and / or a terminal in an RRC_connected state.
- Mode # 4 may be, for example, a terminal located in / out a base station communication coverage, and / or a terminal in an RRC_connection / RRC_idle state.
- the "sensing operation" may be interpreted as a PSSCH-RSRP measurement operation based on a PSSCH DM-RS sequence scheduled by a successfully decoded PSCCH, and / or an S-RSSI measurement operation based on a V2X resource pool related subchannel. have.
- receive means (A) V2X channel (/ signal) (e.g., PSCCH, PSSCH, PSBCH, PSSS / SSSS, etc.) decoding (/ receive) operation, WAN DL channel (/ signal) (e.g., For example, PDCCH, PDSCH, PSS / SSS, etc.) may be extended to at least one of decoding (/ receiving) operation, (B) sensing operation, and (C) CBR measurement operation.
- V2X channel e.g., PSCCH, PSSCH, PSBCH, PSSS / SSSS, etc.
- decoding / receive
- WAN DL channel e.g., For example, PDCCH, PDSCH, PSS / SSS, etc.
- C CBR measurement operation.
- transmit means a V2X channel (/ signal) (eg, PSCCH, PSSCH, PSBCH, PSSS / SSSS, etc.) transmission operation, WAN UL channel (/ signal) (eg, PUSCH, PUCCH, SRS, etc.) ) May be extended to at least one of the transmission operations.
- V2X channel eg, PSCCH, PSSCH, PSBCH, PSSS / SSSS, etc.
- WAN UL channel eg, PUSCH, PUCCH, SRS, etc.
- a “carrier” may be extended to at least one of (A) preset carrier set (/ grouping), (B) V2X resource pool.
- the PSSCH interworking with the PSCCH is transmitted in the form of " frequency division multiplexing " (FDM).
- FDM frequency division multiplexing
- TDM time division multiplexing
- S-RSSI Sidelink Received Signal Strength Indicator
- S-RSRP Sidelink Reference Signal Received Power
- CBR Channel busy ratio
- CBR Channel occupancy ratio
- S-RSSI is a received signal strength indicator in the sidelink.
- S-RSSI is configured in the configured subchannel in SC-FDMA symbols # 1, 2, ..., 6 and SC-FDMA symbols # 0, 1, ..., 5 of the second slot of the subframe.
- the terminal may be defined as a linear average of the total received power for each SC-FDMA symbol.
- the S-RSRP means the reference signal reception power in the sidelink.
- the S-RSRP may include a PSSCH-RSRP obtained by calculating an RSRP from a PSSCH.
- the PSSCH-RSRP is a linear average of the power contributions of resource elements (REs) carrying a demodulation reference signal (DM-RS) associated with the PSSCH, within the physical resource blocks (PRBs) indicated by the associated PSCCH. Can be defined.
- CBR represents the busy ratio of the channel
- the CBR measured in subframe n may be defined as follows.
- the PSSCH In the case of the PSSCH, it is sensed in the subframe [n-100, n-1] and represents the ratio in the resource pool of the sub-channel having the S-RSSI measured as exceeding a predetermined or set threshold.
- PSCCH PSCCH
- S is sensed in subframe [n-100, n-1], and S is measured in a pool configured to transmit PSCCH together with corresponding PSSCH in non-contiguous resource blocks, and is determined to exceed a predetermined threshold or set threshold.
- a predetermined threshold or set threshold Represents a ratio of resources of the PSCCH pool with RSSI.
- the PSCCH pool is composed of resources of two consecutive PRB pairs in the frequency domain.
- CR means channel occupancy.
- the CR calculated in subframe n is the number of subchannels used for its transmission in subframe [na, n-1] and the subchannels allowed for its transmission in subframe [n, n + b]. It can be defined as a value obtained by dividing the total number of the number by the total number of sub-channels set in the transmission pool over the subframe [na, n + b].
- a is a positive integer and b is 0 or a positive integer.
- CR can be evaluated for every (re) transmission. CR may be calculated for each priority level.
- S-PSCCH_L means the number of symbols constituting the S-TTI-based PSCCH
- S-PSSCH_L means the number of symbols constituting the S-TTI-based PSSCH.
- S-PSCCH means S-TTI based PSCCH
- S-PSSCH means S-TTI based PSSCH.
- 5 shows an example of transmission of a PSCCH and a PSSCH.
- the PSCCH and the PSSCH scheduled by the PSCCH may be transmitted through different frequencies (FDM).
- FDM frequencies
- S-PSCCH_L S-PSSCH_L. That is, in the time domain, the number of symbols constituting the S-TTI based PSCCH and the number of symbols constituting the S-TTI based PSSCH are the same.
- S-PSCCH_L > S-PSSCH_L. That is, in the time domain, the number of symbols constituting the S-TTI based PSSCH is smaller than the number of symbols constituting the S-TTI based PSCCH.
- the transmission power may be determined in the same manner as the existing 1 ms TTI-based operation.
- the transmission power may be determined as follows for the S-PSSCH.
- P PSSCH for PSSCH transmission may be determined as follows.
- P CMAX is a configured maximum UE output power.
- M PSSCH is a band of PSSCH resource allocation expressed by the number of resource blocks.
- PL stands for path loss.
- P O_ PSSCH, 3 , ⁇ PSSCH, 3 is a value provided by an upper layer parameter associated with a corresponding PSSCH resource configuration.
- P PSSCH for PSSCH transmission may be determined as follows.
- P PSSCH for PSSCH transmission may be determined as follows.
- M PSCCH is two.
- A may be given by Equation 3 or 4 below.
- Equation 3 If the upper layer parameter 'maxTxpower' is set, equation 3 may be used, otherwise equation 4 may be used.
- P O_ PSSCH, 4 , ⁇ PSSCH, 4 are values provided by higher layer parameters associated with the corresponding PSSCH resource configuration.
- P MAX _ CBR may be set to the upper layer parameter 'maxTxpower' value based on the priority level of the PSCCH and the CBR range.
- FIG. 6 shows a transmission power determination method according to an embodiment of the present invention.
- the priority rule of POWER ALLOCATION may be defined as one or a combination of the following rules.
- the representative S-TTI length related to V2X transmission on a specific carrier may be assumed to be a maximum value (or minimum value) among S-PSCCH_L and S-PSSCH_L.
- the first PPPP value is If it is higher and the rest of the other conditions are the same, then it is the first allocation of transmit power to the first carrier.
- a specific signal / channel transmission (e.g., SLSS / PSBCH) set in advance (/ signaling) may be allocated transmit power at an exceptionally high (or low) priority. For example, when the location of the SLSS / PSBCH resource is differently set (/ signaled) between the carriers, the transmission power is preferentially allocated at the corresponding time point of the carrier including the resource.
- FIG. 7 shows a transmission power allocation method of a terminal according to an embodiment of the present invention.
- the terminal may receive a first carrier and a second carrier for V2X signal transmission.
- the terminal determines the representative TTI length of the first carrier (S210), and after determining the representative TTI length of the second carrier (S220), the representative TTI length of the first carrier and the representative TTI of the second carrier Based on the length, after the first transmission power is allocated to the first carrier, a second transmission power may be allocated to the second carrier (S230).
- the representative TTI length of the first carrier may be shorter than the representative TTI length of the second carrier.
- the first transmission power may be greater than the second transmission power.
- the representative TTI length of the first carrier is from n and m. It can be determined as the maximum value or the minimum value.
- the first transmission power and the second transmission power are priorities for each packet of signals transmitted in the representative TTI length of the first carrier and the representative TTI length of the second carrier, the first carrier and the second carrier, respectively. It may be allocated based on priority per packet (PPPP) and channel busy ratio (CBR).
- PPPP priority per packet
- CBR channel busy ratio
- the PSSCH may be transmitted at a constant transmit power. This has been described with reference to FIG. 6.
- the PSCCH and the PSSCH may be frequency division multiplexed (FDM).
- the number of symbols on which the PSCCH is transmitted in the first carrier is n (n is a natural number)
- the number of symbols on which the PSSCH is transmitted is m (m is a natural number)
- m is a natural number
- the n symbols Transmit power of the PSSCH transmitted in the first and second mn symbols may be different from each other.
- information indicating a difference or a ratio between the transmission power of the PSSCH transmitted in the n symbols and the transmission power of the PSSCH transmitted in the m-n symbols may be provided through the PSCCH. This may be referred to FIG. 9 and the description below.
- the PSCCH is transmitted in a slot (0.5 ms) unit. That is, the PSCCH is transmitted based on the S-TTI.
- the PSSCH is transmitted in units of subframes.
- the value of the representative TTI is determined in the first carrier, and may be determined as 0.5 ms or 1 ms. For example, assume that the value of the representative TTI is determined to be 0.5 ms in the first carrier.
- both PSCCH / PSSCH are transmitted in subframe units.
- the value of the representative TTI in the second carrier may be determined to be 1 ms.
- the terminal may allocate a first transmission power to the first carrier and allocate a second transmission power to the second carrier based on the representative TTI length of the first carrier and the representative TTI length of the second carrier. have. For example, if transmission power is allocated to a relatively short TTI based transmission at high priority, the first transmission power may be allocated to the first carrier first, and then the second transmission power may be allocated to the second carrier. On the contrary, if the transmission power is allocated to the relatively long TTI based transmission with high priority, the second transmission power may be allocated to the second carrier first, and then the first transmission power may be allocated to the first carrier.
- an example in which a priority of allocating transmission powers in a plurality of carriers is determined based mainly on a representative TTI length is not limited. That is, the priority for allocating the transmission power in the plurality of carriers may be determined in consideration of the representative TTI length of the carrier, the ProSe priority per packet (PPPP) of the message transmitted on the carrier, and the CBR. PPPP may be called PPP as a packet priority.
- the terminal may transmit the PSCCH / PSSCH by the method of FIG. 6 described above.
- Open loop power control parameters (and / or maximum transmit power) for each S-TTI length e.g. P_O, ALPHA, P_MAX, etc.
- P_O, ALPHA, P_MAX, etc. are independent of the existing 1 ms based legacy transmission (LEGACY TX). Can be set (/ signaled).
- a parameter / CR_LIMIT value of a physical layer linked to CBR / PPPP for each S-TTI length may be independently set (/ signaled).
- a minimum guaranteed power value may be set (/ signaled) for each S-TTI length.
- V2X transmission resource reservation is made first in terms of power allocation on a specific carrier #A, if a low priority, V2X transmission resource reservation should be additionally performed on another carrier #B, carrier #A It is possible to preferentially use previously reserved resources of the phase and resources of carrier #B that do not overlap (all or part) in the time domain.
- transmission power between symbols during PSSCH transmission may vary.
- the transmission power between the PSSCH region #A and the PSSCH region #B may be different.
- the following method may be considered for quadrature amplitude modulation (QAM) demodulation.
- QAM quadrature amplitude modulation
- the base station or the network may inform "transmission power difference (/ ratio)" information between the PSSCH region #A and the PSSCH region #B through the PSCCH and / or the pull setup signal.
- the transmission power difference (/ ratio) information may be useful especially when there is no demodulation reference signal (DM-RS) symbol transmission in one of the PSSCH regions # A / B.
- DM-RS demodulation reference signal
- the transmission power difference (/ ratio) information may be about the region #A DM-RS symbol and the region #B data symbol.
- the network may signal the "maximum allowable transmit power difference (/ ratio) between PSSCH region #A and PSSCH region #B" for a specific pool, thereby limiting the impact on sensing performance and the like.
- the network may fix the PSCCH length transmitted on a specific pool through predefined signaling, and / or allow a plurality of PSCCH lengths (transmissions), and allow the UE to blind decode (BLIND DECODING).
- the network may designate (or adjust) a carrier (/ full) -specific number of PSCCH (/ PSSCH) blind decoding times of a UE to be performed on a plurality of pools related to a plurality of carriers through predefined signaling. .
- the present invention has been described a proposal method based on the 3GPP LTE system for convenience of description, the scope of the system to which the proposed method is applied can be extended to other systems besides the 3GPP LTE system.
- the proposed schemes of the present invention can be extended and applied for D2D communication.
- the D2D communication means that the terminal communicates directly with another terminal using a wireless channel.
- the terminal means a terminal of a user, but network equipment such as a base station provides a signal according to a communication method between the terminals. In the case of transmitting / receiving, it may also be regarded as a kind of terminal.
- the proposed schemes of the present invention may be limitedly applied only to mode 3 V2X operation (and / or mode 4 V2X operation).
- the proposed schemes are limited to (specific) V2X channel (/ signal) transmissions that are pre-configured (/ signaled), eg, PSSCH (and / or (interlocked) PSCCH and / or PSBCH). It may be applied as.
- the proposed schemes of the present invention are (and / or pre-configured) when the PSSCH and the (interlocked) PSCCH are transmitted adjacent to (ADJACENT) (and / or non-adjacent) in the frequency domain. It may be limitedly applied only to signaled) MCS (and / or coding rate and / or resource block) (value (/ range)) based transmission.
- the proposed schemes of the present invention are mode # 3 (and / or mode # 4) V2X carrier (and / or (mode # 4 (/ 3)) sidelink (/ uplink) SPS (and / or side). It may be limitedly applied only to a link (uplink / uplink dynamic scheduling) carrier.
- the proposed schemes of the present invention provide synchronization signal (transmit (and / or receive)) resource location and / or number (and / or V2X resource pool related subframe location and / or number (and / or sub) between carriers.
- Channel size and / or number may be applied (limited) only if they are the same (and / or (some) different).
- FIG. 10 is a block diagram illustrating an apparatus in which an embodiment of the present invention is implemented.
- the apparatus 1000 includes a processor 1100, a memory 1200, and a transceiver 1300.
- the processor 1100 implements the proposed functions, processes, and / or methods.
- the apparatus 1000 may be a terminal or a base station.
- the transceiver 1300 is connected to the processor 1100 to transmit and receive a radio signal.
- the memory 1200 may store information necessary for the operation of the processor 1100 and may also store a transmission / reception signal.
- FIG 11 illustrates an example of configuring the processor 1100.
- the processor 1100 may include a representative TTI determination module 1101 for determining a representative TTI for each carrier and a power allocation module 1102 for determining transmission power allocated for each carrier.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
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Abstract
Description
Claims (12)
- 복수의 반송파들이 설정된 단말의 전력 할당 방법에 있어서,제1 반송파의 대표 전송 시간 구간 (transmission time interval: TTI)를 결정하고,제2 반송파의 대표 TTI를 결정하고, 및상기 제1 반송파의 대표 TTI 길이 및 상기 제2 반송파의 대표 TTI 길이에 기반하여, 상기 제1 반송파에 제1 전송 전력을 할당한 후, 상기 제2 반송파에 제2 전송 전력을 할당하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 반송파의 대표 TTI 길이는 상기 제2 반송파의 대표 TTI 길이보다 짧은 것을 특징으로 하는 방법.
- 제 2 항에 있어서, 상기 제1 전송 전력은 상기 제2 전송 전력에 비해 더 큰 값인 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 반송파에서 PSCCH(physical sidelink control channel)가 전송되는 심볼 개수가 n(n은 자연수)이고, PSSCH(physical sidelink shared channel)가 전송되는 심볼 개수가 m(m은 자연수)인 경우, 상기 제1 반송파의 대표 TTI 길이는 상기 n, m 중에서 최대값으로 결정되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 반송파에서 PSCCH(physical sidelink control channel)가 전송되는 심볼 개수가 n(n은 자연수)이고, PSSCH(physical sidelink shared channel)가 전송되는 심볼 개수가 m(m은 자연수)인 경우, 상기 제1 반송파의 대표 TTI 길이는 상기 n, m 중에서 최소값으로 결정되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 전송 전력 및 상기 제2 전송 전력은, 상기 제1 반송파의 대표 TTI 길이 및 상기 제2 반송파의 대표 TTI 길이, 상기 제1 반송파 및 상기 제2 반송파에서 각각 전송되는 신호의 패킷 별 우선 순위(priority per packet) 및 CBR(channel busy ratio)에 기반하여 할당되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 반송파에서 PSCCH(physical sidelink control channel)가 전송되는 심볼 개수가 n(n은 자연수)이고, PSSCH(physical sidelink shared channel)가 전송되는 심볼 개수가 m(m은 자연수)이며, 상기 m이 상기 n보다 큰 경우,상기 m개의 심볼들에서 일정한 전송 전력으로 상기 PSSCH가 전송되는 것을 특징으로 하는 방법.
- 제 7 항에 있어서, 상기 PSCCH 및 상기 PSSCH는 주파수 분할 다중화(frequency division multiplexing: FDM)되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 반송파에서 PSCCH(physical sidelink control channel)가 전송되는 심볼 개수가 n(n은 자연수)이고, PSSCH(physical sidelink shared channel)가 전송되는 심볼 개수가 m(m은 자연수)이며, 상기 m이 상기 n보다 큰 경우,상기 n개의 심볼들에서 전송되는 상기 PSSCH의 전송 전력과 상기 m-n 개의 심볼들에서 전송되는 상기 PSSCH의 전송 전력이 서로 다른 것을 특징으로 하는 방법.
- 제 9 항에 있어서, 상기 PSCCH를 통해 상기 n개의 심볼들에서 전송되는 상기 PSSCH의 전송 전력과 상기 m-n 개의 심볼들에서 전송되는 상기 PSSCH의 전송 전력의 차이 또는 비율을 알려주는 정보를 수신하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 제1 반송파 및 상기 제2 반송파는 상기 복수의 반송파들에 포함되는 것을 특징으로 하는 방법.
- 단말은,무선 신호를 송신 및 수신하는 송수신기(transceiver); 및상기 송수신기와 결합하여 동작하는 프로세서;를 포함하되, 상기 프로세서는,제1 반송파의 대표 전송 시간 구간 (transmission time interval: TTI)를 결정하고, 제2 반송파의 대표 TTI를 결정하고, 상기 제1 반송파의 대표 TTI 길이 및 상기 제2 반송파의 대표 TTI 길이에 기반하여, 상기 제1 반송파에 제1 전송 전력을 할당한 후, 상기 제2 반송파에 제2 전송 전력을 할당하는 것을 특징으로 하는 단말.
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CN201880020818.6A CN110463315B (zh) | 2017-03-24 | 2018-03-26 | 配置有多个载波的终端的功率分配方法以及使用该方法的终端 |
US16/497,426 US11917555B2 (en) | 2017-03-24 | 2018-03-26 | Power allocation method of terminal having multiple carriers configured, and terminal using same |
KR1020197026851A KR102258653B1 (ko) | 2017-03-24 | 2018-03-26 | 복수의 반송파들이 설정된 단말의 전력 할당 방법 및 상기 방법을 이용하는 단말 |
JP2019552626A JP6963026B2 (ja) | 2017-03-24 | 2018-03-26 | 複数の搬送波が設定された端末の電力割当方法及び上記方法を利用する端末 |
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JP7429282B2 (ja) | 2018-08-07 | 2024-02-07 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | 通信装置、通信方法、及び集積回路 |
JP7420910B2 (ja) | 2018-11-01 | 2024-01-23 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | 通信装置、通信方法、及び集積回路 |
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US11838871B2 (en) | 2019-04-28 | 2023-12-05 | Lg Electronics Inc. | Method and device for controlling sidelink transmission power in NR V2X |
KR20210133311A (ko) * | 2019-04-28 | 2021-11-05 | 엘지전자 주식회사 | Nr v2x에서 사이드링크 전송 전력을 제어하는 방법 및 장치 |
US11457412B2 (en) | 2019-04-28 | 2022-09-27 | Lg Electronics Inc. | Method and device for controlling sidelink transmission power in NR V2X |
WO2021062613A1 (zh) * | 2019-09-30 | 2021-04-08 | Oppo广东移动通信有限公司 | 数据传输的方法和设备 |
Also Published As
Publication number | Publication date |
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EP3592070B1 (en) | 2022-05-04 |
JP6963026B2 (ja) | 2021-11-05 |
US20230076122A1 (en) | 2023-03-09 |
CN110463315B (zh) | 2023-12-01 |
CN110463315A (zh) | 2019-11-15 |
US11917555B2 (en) | 2024-02-27 |
KR102258653B1 (ko) | 2021-06-01 |
JP2020511907A (ja) | 2020-04-16 |
EP3592070A4 (en) | 2020-03-18 |
KR20190110143A (ko) | 2019-09-27 |
EP3592070A1 (en) | 2020-01-08 |
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