KR20240123703A - Method for transmitting uplink signal in a wireless communication system and apparatus therefor - Google Patents

Abstract

A method for transmitting an uplink signal based on a random access procedure by a terminal in a wireless communication system is disclosed.
More specifically, the method comprises the steps of: receiving, from a base station, configuration information on channel parameters related to a random access procedure; transmitting, to the base station, the uplink signal based on the configuration information; and receiving, from the base station, a response message for the uplink signal, wherein the reception timing at which the terminal receives the response message is determined based on the length of information included in the uplink signal.

Description

METHOD FOR TRANSMITTING UPLINK SIGNAL IN A WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

The present disclosure relates to a method for transmitting an uplink signal in a wireless communication system, and more specifically, to a method for transmitting an uplink signal based on a random access procedure and a device therefor.

In order to meet the increasing demand for wireless data traffic since the commercialization of the 4G (4th generation) communication system, efforts are being made to develop an improved 5G (5th generation) communication system or pre-5G communication system. For this reason, the 5G communication system or pre-5G communication system is also called a communication system after the 4G network (Beyond 4G Network) or a system after the LTE (Long-Term Evolution) system (Post LTE). In order to achieve a high data transmission rate, the 5G communication system is being considered for implementation in an ultra-high frequency (mmWave) band (for example, a 60 gigabit (70 GHz) band). To mitigate radio path loss and increase the transmission range of radio waves in ultra-high frequency bands, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, and large scale antenna technologies are being discussed in 5G communication systems. In addition, to improve the network of the system, technologies such as evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, device to device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation are being developed in 5G communication systems. In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) are being developed in 5G systems.

The present disclosure provides a method for transmitting an uplink signal in a wireless communication system and a device therefor.

In addition, the present disclosure provides a method and a device for transmitting an uplink signal based on a random access procedure in a wireless communication system.

In addition, the present disclosure provides a method and a device therefor for preventing collision between terminals performing random access when performing a random access procedure in a wireless communication system.

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

The present disclosure proposes a method for a terminal to transmit an uplink signal based on a random access procedure in a wireless communication system.

More specifically, the present disclosure provides a method for a terminal in a wireless communication system to transmit an uplink signal based on a random access procedure, the method comprising: receiving, from a base station, configuration information on channel parameters related to the random access procedure; transmitting, to the base station, the uplink signal based on the configuration information; and receiving, from the base station, a response message for the uplink signal, wherein a reception timing at which the terminal receives the response message is determined based on a length of information included in the uplink signal.

In addition, the present disclosure may be characterized in that the reception timing is delayed in proportion to the length of information included in the uplink signal.

In addition, the present disclosure may be characterized by further including a step of determining a position of a slot for transmitting the uplink signal within a super frame, which is a time unit including at least one slot.

In addition, the present disclosure may be characterized in that the position of a slot in which the uplink signal is transmitted within the superframe is determined based on (i) a superframe number, (ii) a packet sequence number of information included in the uplink signal, and (ii) an identifier (ID) of the terminal.

In addition, the present disclosure may be characterized by further including a step of performing decoding on the response message at a reception timing determined based on the length of information included in the uplink signal.

In addition, the present disclosure may further include a step of performing, by the base station, retransmission of the uplink signal based on the response message, wherein the retransmission is performed after the reception timing.

In addition, the present disclosure may be characterized in that the retransmission is performed in another superframe located a specific time interval later than the superframe in which the uplink signal was transmitted.

In addition, the present disclosure may be characterized in that a specific time interval is determined based on (i) a packet sequence number of information included in the uplink signal, (ii) an identifier (ID) of the terminal, and (iii) a retransmission count indicating which retransmission the retransmitted uplink signal is.

In addition, the present disclosure may be characterized in that the information included in the uplink signal is a random access preamble.

In addition, the present disclosure may be characterized in that information included in the uplink signal is user data.

In addition, the present disclosure provides a terminal for transmitting an uplink signal based on a random access procedure in a wireless communication system, the terminal including: one or more transceivers; one or more processors; and one or more memories connected to the one or more processors and storing instructions for operations executed by the one or more processors, wherein the operations include: receiving, from a base station, configuration information for a channel parameter related to a random access procedure; transmitting, to the base station, the uplink signal based on the configuration information; and receiving, from the base station, a response message for the uplink signal, wherein a reception timing at which the terminal receives the response message is determined based on a length of information included in the uplink signal.

In addition, the present disclosure provides a method for a base station in a wireless communication system to receive an uplink signal based on a random access procedure, the method including: transmitting, to a terminal, configuration information on a channel parameter related to the random access procedure; receiving, from the terminal, the uplink signal based on the configuration information; and transmitting, to the terminal, a response message for the uplink signal, wherein a transmission timing at which the base station transmits the response message is determined based on a length of information included in the uplink signal.

In addition, the present disclosure provides a terminal for transmitting an uplink signal based on a random access procedure in a wireless communication system, the terminal including: one or more transceivers; one or more processors; and one or more memories connected to the one or more processors, storing instructions for operations executed by the one or more processors, wherein the operations include: a step of transmitting, to the terminal, configuration information for a channel parameter related to a random access procedure; a step of receiving, from the terminal, the uplink signal based on the configuration information; and a step of transmitting, to the terminal, a response message for the uplink signal, wherein a transmission timing at which the base station transmits the response message is determined based on a length of information included in the uplink signal.

In addition, the present disclosure provides a device including one or more memories and one or more processors functionally connected to the one or more memories, wherein the one or more processors execute instructions for operations performed by the device, the operations including: receiving, from a base station, configuration information on a channel parameter related to a random access procedure; transmitting, to the base station, the uplink signal based on the configuration information; and receiving, from the base station, a response message for the uplink signal, wherein a reception timing at which the terminal receives the response message is determined based on a length of information included in the uplink signal.

In addition, the present disclosure relates to one or more non-transitory computer-readable media storing one or more instructions, wherein the one or more instructions executable by one or more processors include operations performed by a terminal, the operations including: receiving, from a base station, configuration information about a channel parameter related to a random access procedure; transmitting, to the base station, the uplink signal based on the configuration information; and receiving, from the base station, a response message for the uplink signal, wherein a reception timing at which the terminal receives the response message is determined based on a length of information included in the uplink signal.

The present disclosure has the effect of transmitting an uplink signal in a wireless communication system.

In addition, the present disclosure has an effect of transmitting an uplink signal based on a random access procedure in a wireless communication system.

In addition, the present disclosure has an effect of preventing collisions between terminals performing random access when performing a random access procedure in a wireless communication system.

In addition, the present disclosure has an effect in that, when performing a random access procedure in a wireless communication system, battery consumption of terminals performing random access can be reduced.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by a person skilled in the art to which the present disclosure belongs from the description below.

The accompanying drawings, which are incorporated in and are intended to aid in the understanding of the present disclosure and are incorporated in and constitute a part of the detailed description, provide embodiments of the present disclosure and together with the detailed description, describe the technical features of the present disclosure.
FIG. 1 illustrates an example of a wireless network according to embodiments of the present disclosure.
FIG. 2 illustrates an example of a base station according to embodiments of the present disclosure.
FIG. 3 illustrates an example of a terminal according to embodiments of the present disclosure.
FIG. 4 is a diagram showing the basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted, in an NR system according to one embodiment of the present disclosure.
Figures 5 and 6 schematically illustrate the structure of a wireless frame applied to the present disclosure.
Figure 7 is a diagram illustrating various deployment scenarios of an NB-IoT system.
Figure 8 is a diagram illustrating a resource grid corresponding to one subframe in an NB-IoT system.
Figure 9 is a diagram illustrating the structure of an L-subframe in an NB-IoT system.
Figure 10 is a diagram illustrating the structure of an L-superframe in an NB-IoT system.
Figure 11 is a diagram illustrating the downlink time domain structure in an NB-IoT system.
Figure 12 is a diagram illustrating PSS/SSS transmission in an NB-IoT system.
Figure 13 is a diagram illustrating an example of PSS transmission in an NB-IoT system.
Figure 14 is a diagram illustrating an example of PBCH transmission in an NB-IoT system.
Figure 15 is a diagram illustrating PSS/SSS/MIB transmission of an NB-IoT system in the time domain to avoid collision with PSS/SSS/MIB of a legacy system.
Figure 16 is a diagram showing an example of a random access procedure.
Figure 17 is a diagram showing an example in which multiple terminals perform random access.
Figure 18 is a diagram showing another example in which multiple terminals perform random access.
FIG. 19 is a flowchart illustrating an example of a method for transmitting an uplink signal based on a random access procedure proposed in the present disclosure performed at a terminal.
FIG. 20 is a flowchart illustrating an example of a method for receiving an uplink signal based on a random access procedure proposed in the present disclosure performed at a base station.

In various embodiments of the present disclosure, "/" and "," should be interpreted as representing "and/or". For example, "A/B" can mean "A and/or B". Furthermore, "A, B" can mean "A and/or B". Furthermore, "A/B/C" can mean "at least one of A, B, and/or C". Furthermore, "A, B, C" can mean "at least one of A, B, and/or C".

In various embodiments of the present disclosure, "or" should be interpreted as meaning "and/or." For example, "A or B" can include "only A," "only B," and/or "both A and B." In other words, "or" should be interpreted as meaning "additionally or alternatively."

The following technology can be used in various wireless communication systems, such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications)/GPRS (general packet radio service)/EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, providing backward compatibility with systems based on IEEE 802.16e. UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is a part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTS terrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

5G NR is a new clean-slate type mobile communication system that is the successor technology to LTE-A and has the characteristics of high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, from low frequency bands below 1 GHz to intermediate frequency bands between 1 GHz and 10 GHz, and high frequency (millimeter wave) bands above 24 GHz.

For clarity of explanation, the description will focus on LTE-A or 5G NR, but the technical ideas according to one embodiment of the present disclosure are not limited thereto.

In order to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems, efforts are being made to develop improved 5G communication systems or pre-5G communication systems. For this reason, 5G communication systems or pre-5G communication systems are also called Beyond 4G Network communication systems or Post LTE systems. The 5G communication system specified by 3GPP is called the New Radio (NR) system. In order to achieve high data transmission rates, 5G communication systems are being considered for implementation in ultra-high frequency (mmWave) bands (e.g., 60 gigahertz (60 GHz) bands). To mitigate radio path loss and increase the transmission range of radio waves in ultra-high frequency bands, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, and large scale antenna technologies have been discussed and applied to NR systems in 5G communication systems. In addition, to improve the network of the system, technologies such as evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, device to device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation are being developed in 5G communication systems. In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) are being developed in 5G systems.

Meanwhile, the Internet is evolving from a human-centered network where humans create and consume information to an Internet of Things (IoT) network where information is exchanged and processed between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection to cloud servers, is also emerging. In order to implement IoT, technological elements such as sensing technology, wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, technologies such as sensor networks for connection between objects, machine-to-machine (M2M), and machine type communication (MTC) are being studied. In the IoT environment, intelligent IT (Internet Technology) services can be provided that collect and analyze data generated from connected objects to create new values for human life. IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services through convergence and combination between existing IT (information technology) technologies and various industries.

Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) are being implemented by 5G communication technologies such as beam forming, MIMO, and array antennas. The application of cloud radio access networks (cloud RAN) as a big data processing technology described above can also be said to be an example of the convergence of 5G and IoT technologies.

Meanwhile, the new 5G communication, NR (New Radio access technology), is designed to allow various services to be freely multiplexed in time and frequency resources, and accordingly, waveform/numerology, etc. and reference signals can be dynamically or freely allocated according to the needs of the corresponding service. In order to provide the optimal service to the terminal in wireless communication, optimized data transmission through measurement of channel quality and interference amount is important, and therefore accurate channel status measurement is essential. However, unlike 4G communication where channel and interference characteristics do not change significantly depending on frequency resources, in the case of 5G channels, channel and interference characteristics change significantly depending on the service, so support for subsets at the FRG (Frequency Resource Group) level is required to allow for dividing and measuring them. Meanwhile, the types of services supported in the NR system can be divided into categories such as eMBB (Enhanced mobile broadband), mMTC (massive Machine Type Communications) (mMTC), and URLLC (Ultra-Reliable and low-latency Communications). eMBB can be seen as a service that aims for high-speed transmission of large-capacity data, mMTC as a service that aims for minimizing terminal power and connecting multiple terminals, and URLLC as a service that aims for high reliability and low delay. Different requirements can be applied depending on the type of service applied to the terminal.

In this way, multiple services can be provided to users in a communication system, and in order to provide such multiple services to users, a method and a device using the same are required that can provide each service within the same time period according to its characteristics.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure will be omitted. This is to convey the gist of the present disclosure more clearly without obscuring it by omitting unnecessary descriptions.

For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not entirely reflect the actual size. The same or corresponding components in each drawing are given the same reference numbers.

The advantages and features of the present disclosure, and the methods for achieving them, will become apparent by referring to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms, and the embodiments are provided only to make the disclosure of the present disclosure complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the disclosure.

At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions. These computer program instructions can be loaded onto a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flow diagram block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement the function in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured article including an instruction means for performing the functions described in the flow diagram block(s). Since the computer program instructions may be installed on a computer or other programmable data processing apparatus, a series of operational steps may be performed on the computer or other programmable data processing apparatus to produce a computer-executable process, so that the instructions executing the computer or other programmable data processing apparatus may also provide steps for executing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a particular logical function(s). It should also be noted that in some alternative implementation examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be performed substantially concurrently, or the blocks may sometimes be performed in reverse order, depending on the functionality they perform.

Here, the term '~ part' used in the present embodiment means a software or hardware component such as an FPGA or ASIC, and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Thus, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. In addition, the components and '~ parts' may be implemented to reproduce one or more CPUs in a device or a secure multimedia card. Additionally, in the embodiment, '~bu' may include one or more processors.

Wireless communication systems are evolving from the initial voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as 3GPP's HSPA (high speed Packet Access), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-Advanced (LTE-A), 3GPP2's HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE's 802.16e. In addition, communication standards for 5G or NR (new radio) are being created as the 5th generation wireless communication system.

As a representative example of a wideband wireless communication system, the NR system adopts the OFDM (orthogonal frequency division multiplexing) method in the downlink (DL) and uplink. More specifically, the CP-OFDM (cyclic-prefix OFDM) method is adopted in the downlink, and both the CP-OFDM and the DFT-S-OFDM (discrete Fourier transform spreading OFDM) method are adopted in the uplink. The uplink refers to a wireless link in which a user equipment (UE) or mobile station (MS) transmits data or a control signal to a base station (gNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or a control signal to a user equipment (UE). The above multiple access method typically allocates and operates the time-frequency resources for transmitting data or control information to each user so that they do not overlap with each other, that is, so as to achieve orthogonality, thereby distinguishing the data or control information of each user.

The base station is the entity that communicates with the terminal, and may also be referred to as BS, NodeB (NB), eNodB (eNB), AP (Access Point), etc.

A device is an entity that communicates with a base station and may be referred to as an NB-IoT device, UE (user equipment), Mobile Station (MS), Mobile Equipment (ME), terminal, etc.

Wireless Network General

FIGS. 1 to 3 illustrate various embodiments implemented in the wireless communication system disclosed below and utilizing orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access.

FIGS. 1-3 are not intended to imply physical or structural limitations on the manner in which other embodiments may be implemented. Other embodiments of the present disclosure may be implemented in any suitably arranged communication system.

FIG. 1 illustrates an example of a wireless network according to embodiments of the present disclosure. The embodiment of the wireless network illustrated in FIG. 1 is for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

As illustrated in FIG. 1, the wireless network may include gNB 101, gNB 102, and gNB 103. Additionally, gNB 101 may communicate with at least one network 103, for example, the Internet, a proprietary Internet protocol (IP) network, or another data network.

A gNB 102 may provide wireless broadband access to a network 130 for a first plurality of user equipment (UE) within a coverage area 120 of the gNB 102. The first plurality of user equipment may include a user device 111 that may be located in a small business (SB), a user device 112 that may be located in an enterprise (E), a user device 113 that may be located in a WIFI hotspot (HS), a UE 114 that may be located in a first residence (R), a UE 115 that may be located in a second residence (R), a UE 115 that may be located in a mobile device (M), for example, a cell phone, a wireless laptop, a wireless PDF, or the like.

The gNB 103 may provide wireless broadband access to the network 130 for a second plurality of UEs within a coverage area 125 of the gNB 103. The second plurality of UEs may include UE 115, UE 116. In one embodiment, at least one of the gNBs 101-103 may communicate with each other or with the UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WIFI, or other wireless communication technologies.

Depending on the network type, the term "base station" or "BS" may refer to any component (or collection of components) configured to provide wireless access to the network, such as a transmit point (TP), a transmit-receive point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macro cell, a femtocell, a WiFi access point (AP), or other radio-enabled device.

A base station may provide wireless access according to one or more wireless communication protocols, e.g., 5G 3GPP New Radio Interface/Access (NR), Long Term Evolution (LTE), LTE Advanced (LTE-A), High-Speed Packet Access (HSPA)), Wi-Fi 802.11a/b/g/n/ac, etc. For convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to a network infrastructure component that provides wireless access to a remote terminal. Additionally, depending on the network type, the term "user equipment" or "UE" may refer to any component, such as a "mobile station", "subscriber", "remote terminal", "wireless terminal", "receiving point" or "user device".

For convenience, the terms “user equipment” and “UE” are used in this patent document to refer to remote wireless equipment that wirelessly accesses a BS, wherein the UE may be a mobile device (e.g., a mobile phone or a smart phone) or generally considered a stationary device (e.g., a desktop computer or a vending machine).

The dotted lines represent approximate extents of coverage areas 120 and 125, which are depicted as roughly circular for illustration and illustrative purposes only. Coverage areas 120 and 125 associated with the gNB may have other shapes, including irregular shapes, depending on variations in the radio environment associated with the configuration of the gNB, natural and human-made obstacles, etc.

As described in more detail below, at least one of the UEs 111-116 may include circuitry, programming or a combination thereof for reception reliability for data and control information in an advanced wireless communication system. In certain embodiments, at least one of the gNBs 101-103 may include circuitry, programming or a combination thereof for efficient network control resource allocation in New Radio (NR) vehicle-to-everything (V2X).

While FIG. 1 illustrates an example of a wireless network, various modifications may be made to FIG. 1 . For example, the wireless network may include any number of gNBs and any number of UEs in any suitable arrangement. In addition, gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130. Similarly, each of gNBs 102-103 may communicate directly with the network 130 and provide the UEs with direct wireless broadband access to the network 130. In addition, gNBs 101, 102, and/or 103 may provide access to other or additional external networks, such as an external telephone network or other type of data network.

FIG. 2 illustrates an example of a gNB 102 according to embodiments of the present disclosure. The embodiment of the gNB 102 illustrated in FIG. 1 is for illustration only, and gNB 101 and gNB 103 of FIG. 1 may have the same or similar configurations. However, the gNB may be provided in various configurations, and FIG. 2 does not limit the scope of the disclosure to any particular implementation of a gNB.

As illustrated in FIG. 2, the gNB 102 may include multiple antennas 205a-205n, multiple radio frequency (RF) transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. The gNB 102 may also include a controller/processor 225, memory 230, and a backhaul or network interface (network IF) 235.

The RF transceivers 210a-210n can receive incoming RF signals, such as signals transmitted by UEs in the network 100, from the antennas 205a-205n. The RF transceivers 210a-210n can down-convert the incoming RF signals to generate intermediate frequency (IF) or baseband signals. The IF or baseband signals are transmitted to RX processing circuitry 220, which can generate baseband signals that are processed by filtering, decoding, and/or digitizing. The RX processing circuitry 220 can transmit the processed baseband signals to a controller/processor 225 for further processing.

The TX processing circuitry 215 may receive analog or digital data (e.g., voice data, web data, e-mail, interactive video game data) from the controller/processor 225. The TX processing circuitry 215 may encode, multiplex, and/or digitize the outgoing baseband data to generate processed baseband or IF signals.

The controller/processor 225 may include at least one processor or other processing device that controls the overall operation of the gNB 102. For example, the controller/processor 225 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 210a-210n, the RX processing circuitry 220, and the TX processing circuitry 215 according to well-known principles. The controller/processor 225 may also support additional functions, such as more advanced wireless communication capabilities. For example, the controller/processor 225 may support beamforming or directional routing operations in which signals from the multiple antennas 205a-205n are weighted differently to effectively steer them in a desired direction. Any of a variety of other functions may be supported in the gNB 102 by the controller/processor 225.

The controller/processor 225 may also execute programs and other processes that reside in the memory 230, such as an operating system (OS). The controller/processor 225 may move data in and out of the memory 230 as required by the executing processes.

Additionally, the controller/processor 225 may be connected to a backhaul or network interface 235. The backhaul or network interface 235 enables the gNB 102 to communicate with other devices or systems over a backhaul connection or a network. The interface 235 may support communication over any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (e.g., supporting 5G, LTE, or LTE-A), the interface 235 may allow the gNB 102 to communicate with other gNBs over a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 may enable the gNB 102 to communicate over a wired or wireless local area network, or over a wired or wireless connection to a larger network (e.g., the Internet). Interface 235 may include any suitable structure that supports communications over wired or wireless connections, such as Ethernet or an RF transceiver.

Memory 230 may be coupled to controller/processor 225. Part of memory 230 may include RAM, and another part of memory 230 may include flash memory or other ROM.

While FIG. 2 illustrates an example of a gNB 102, various changes may be made to FIG. 2 . For example, the gNB 102 may include any number of each of the components illustrated in FIG. 2 . As a specific example, the access point may include multiple interfaces 235 , and the controller/processor 225 may support routing functions for routing data between different network addresses. As another specific example, while illustrated as including a single instance of TX processing circuitry (215) and a single instance of RX processing circuitry (220), the gNB (102) may include multiple instances of each (e.g., one per RF transceiver).

Additionally, the various components of FIG. 2 may be combined, further subdivided, or omitted, and additional components may be added as required.

FIG. 3 illustrates an exemplary UE 116, according to embodiments of the present disclosure. The embodiment of UE 116 illustrated in FIG. 3 is for illustrative purposes only and may have a configuration similar to or similar to UEs 111-115 of FIG. 1. However, UEs are provided in a variety of configurations, and FIG. 3 does not limit the scope of the present disclosure to any particular implementation of a UE.

As illustrated in FIG. 3, the UE 116 may include an antenna 305, a radio frequency (RF) transceiver 310, transmit (TX) processing circuitry 315, a microphone 320, and receive (RX) processing circuitry 325. Additionally, the UE 116 may include a speaker 330, a processor 340, an input/output (I/O) interface (IF) 345, a touch screen 350, a display 355, and memory 360. The memory 360 may include an operating system (OS) 361 and one or more applications 362.

The RF transceiver 310 can receive an incoming RF signal transmitted by a gNB of the network 100 from the antenna 305. The RF transceiver 310 can down-convert the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signals are transmitted to the RX processing circuitry 325, which can generate a processed baseband signal by filtering, decoding, and/or digitizing. The RX processing circuitry 325 can transmit the processed baseband signal to a speaker 330 (e.g., voice data) or a processor 340 for further processing (e.g., web browsing data).

The TX processing circuitry 315 may receive analog or digital voice data from the microphone 320 or other outgoing baseband data (such as web data, e-mail, or interactive video game data) from the processor 340. The TX processing circuitry 315 may encode, multiplex, and/or digitize the transmitting baseband data to generate processed baseband or IF signals.

The RF transceiver 310 can receive a baseband or IF signal from the TX processing circuit 315 that has been transmitted and up-convert the baseband or IF signal to an RF signal transmitted through the antenna 305.

The processor 340 may include one or more processors or other processing devices and may execute an OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the controller/processor 225 may control the reception of forward channel signals and transmission of reverse channel signals by the RF transceivers 210a-210n, the RX processing circuitry 220 and the TX processing circuitry 215 according to well-known principles. In some embodiments, the processor 340 may include one or more microprocessors or microcontrollers.

Additionally, the processor 340 may execute other processes and programs residing in the memory 360, such as processes for beam management. The processor 340 may move data into and out of the memory 360 as required by the executing processes. In one embodiment, the processor 340 may be configured to execute an application 362 based on the OS 361 or in response to signals received from the gNB or an operator.

Additionally, the processor 340 is connected to an I/O interface 345, which may provide the UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers.

Additionally, the processor 340 may be coupled to a touch screen 350 and a display 355. An operator of the UE 116 may use the touch screen 350 to enter data into the UE 116. The display 355 may be a liquid crystal display, a light emitting diode display, or other display capable of rendering text and/or at least limited graphics, such as a website.

Memory 360 may be coupled to processor 340. Part of memory 360 may include random access memory (RAM), and another part of memory 360 may include flash memory or other read-only memory (ROM).

FIG. 3 illustrates an example of a UE 116, and FIG. 3 may be modified in various ways. For example, various components of FIG. 3 may be combined, further subdivided, or omitted, and additional components may be added as needed. As a specific example, the processor 340 may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). FIG. 3 also illustrates a UE 116 configured as a mobile phone or smart phone, and the UE may be configured to operate as other types of mobile or stationary devices.

The present disclosure relates generally to wireless communication systems, and more specifically to vehicular communication network protocols including vehicle-to-device, vehicle-to-vehicle, and vehicle-to-network communication resource allocation and synchronization schemes.

A communication system may include a downlink (DL) that transmits signals from a transmission point, such as a base station (BS) or NodeB, to user equipment (UE), and an uplink (UL) that transmits signals from the UE to a receiving point, such as a NodeB.

Additionally, sidelink (SL) can carry signals from UEs to other UEs or to other non-infrastructure-based nodes. A UE, also commonly referred to as a terminal or mobile station, can be fixed or mobile and can be a cellular phone, a personal computing device, etc. A NodeB, which is usually a fixed station, may also be referred to as an access point or other equivalent terms, such as an eNodeB. An access network that includes a NodeB associated with 3GPP LTE is called an Evolved Universal Terrestrial Access Network (E-UTRAN).

NR System Related

FIG. 4 is a diagram showing the basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted, in an NR system according to one embodiment of the present disclosure.

Specifically, FIG. 4 shows the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in the downlink or uplink in an NR system.

Referring to Fig. 4, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and Nsymb OFDM symbols (1-02) can be gathered to form one slot (1-06). The length of a subframe is defined as 1.0 ms, and a radio frame (1-14) is defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth can be composed of a total of NBW subcarriers (1-04).

In the time-frequency domain, the basic unit of resources is the resource element (RE) (1-12), which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) (1-08, physical resource block; PRB) can be defined by Nsymb consecutive OFDM symbols (1-02) in the time domain and NRB consecutive subcarriers (1-10) in the frequency domain. Accordingly, one RB (1-08) can be composed of Nsymb x NRB REs (1-12). In general, the minimum transmission unit of data is an RB unit. In an NR system, Nsymb = 14, NRB = 12, and NBW and NRB can be proportional to the bandwidth of the system transmission band. In addition, the data rate can increase in proportion to the number of RBs scheduled to the terminal.

In the NR system, in the case of an FDD system that operates the downlink and uplink by distinguishing them by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth may represent an RF bandwidth corresponding to the system transmission bandwidth. [Table 1] and [Table 2] represent part of the correspondence between the system transmission bandwidth, subcarrier spacing, and channel bandwidth defined in the NR system in a frequency band lower than 6 GHz and a frequency band higher than 6 GHz, respectively. For example, an NR system having a channel bandwidth of 100 MHz with a subcarrier spacing of 30 kHz has a transmission bandwidth composed of 273 RBs. N/A below may be a bandwidth-subcarrier combination not supported by the NR system.

In the NR system, the frequency range can be divided into FR1 and FR2 and defined as shown in Table 3 below.

The ranges of FR1 and FR2 may be changed and applied differently. For example, the frequency range of FR1 may be changed and applied from 450 MHz to 6000 MHz.

In the NR system, scheduling information for downlink data or uplink data is transmitted from the base station to the terminal via downlink control information (DCI). DCI can be defined according to various formats, and DCI can indicate, depending on each format, whether it is scheduling information for uplink data (UL grant) or scheduling information for downlink data (DL grant), whether it is compact DCI having a control information size smaller than a predetermined size, whether it applies spatial multiplexing using multiple antennas, and whether it is DCI for power control. For example, DCI format 1-1, which is scheduling control information (DL grant) for downlink data, can include at least one of the following control information.

- Carrier indicator: Indicates on which frequency carrier the transmission is being made.

- DCI format indicator: This is an indicator that distinguishes whether the DCI is for downlink or uplink.

- Bandwidth part (BWP) indicator: Indicates which BWP is being transmitted.

- Frequency domain resource allocation: Indicates the RB of the frequency domain allocated for data transmission. The resource to be expressed is determined based on the system bandwidth and resource allocation method.

- Time domain resource allocation: Indicates in which OFDM symbol of which slot the data-related channel will be transmitted.

- VRB-to-PRB mapping: Indicates how to map the virtual RB (VRB) index and the physical RB (PRB) index.

- Modulation and coding scheme (MCS): Indicates the modulation method used for data transmission and the size of the transport block, which is the data to be transmitted.

- HARQ process number: Indicates the HARQ process number.

- New data indicator: Indicates whether it is a HARQ initial transmission or a retransmission.

- Redundancy version: Indicates the redundancy version of HARQ.

- Transmit power control (TPC) command for PUCCH (physical uplink control channel): Indicates a transmit power control command for PUCCH, which is an uplink control channel.

For data transmission via PDSCH or PUSCH, time domain resource assignment can be determined by information about a slot in which the PDSCH/PUSCH is transmitted, a start symbol position S in the slot, and the number of symbols L to which the PDSCH/PUSCH is mapped. S can be a relative position from the start of the slot, L can be a number of consecutive symbols, and S and L can be determined from a start and length indicator value (SLIV) defined as follows.

In the NR system, a terminal can receive information about a SLIV value, a PDSCH/PUSCH mapping type, and a slot in which PDSCH/PUSCH is transmitted through RRC configuration in one row (for example, the information can be set in the form of a table). In the subsequent time domain resource allocation of DCI, the base station can transmit information about the SLIV value, the PDSCH/PUSCH mapping type, and the slot in which PDSCH/PUSCH is transmitted to the terminal by indicating an index value in the set table.

In the NR system, PDSCH mapping types can be defined as type A and type B. According to PDSCH mapping type A, the first symbol of DMRS symbols can be located in the second or third OFDM symbol of a slot. According to PDSCH mapping type B, the first symbol of DMRS symbols can be located in the first OFDM symbol of the time-domain resource allocated for PUSCH transmission.

DCI can be transmitted on a PDCCH (Physical downlink control channel) which is a downlink physical control channel after going through a channel coding and modulation process. In the present disclosure, when control information is transmitted through a PDCCH or a PUCCH, it can be expressed as PDCCH or PUCCH is transmitted. Similarly, in the present disclosure, when data is transmitted through a PUSCH or a PDSCH, it can be expressed as PUSCH or PDSCH is transmitted.

In general, DCI can be scrambled with a specific RNTI (radio network temporary identifier) (or terminal identifier) independently for each terminal, a CRC (cyclic redundancy check) is added, channel coded, and then configured as an independent PDCCH for transmission. The PDCCH can be mapped and transmitted in a control resource set (CORESET) set for the terminal.

Downlink data can be transmitted on the physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH can be transmitted after the control channel transmission period, and scheduling information such as specific mapping locations and modulation methods in the frequency domain can be determined based on the DCI transmitted through the PDCCH.

Among the control information constituting the DCI, the base station can notify the terminal of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size; TBS) through the MCS (Modulation Coding Scheme). According to an embodiment of the present disclosure, the MCS may be composed of 5 bits or more or less bits. The TBS (Transport Block Size) may correspond to the size of the data (transport block, TB) to be transmitted by the base station before channel coding for error correction is applied.

In the present disclosure, a transport block (TB) may include a MAC (medium access control) header, a MAC control element (CE), one or more MAC SDUs (service data units), and padding bits. Alternatively, the TB may represent a unit of data delivered from a MAC layer to a physical layer or a MAC PDU (protocol data unit).

The modulation methods supported in the NR system are QPSK (quadrature phase shift keying), 16QAM (quadrature amplitude modulation), 64QAM, and 256QAM, and the modulation orders (Qm) correspond to 2, 4, 6, and 8, respectively. That is, in the case of QPSK modulation, 2 bits can be transmitted per symbol, in the case of 16QAM modulation, 4 bits can be transmitted per symbol, in the case of 64QAM modulation, 6 bits can be transmitted per symbol, and in the case of 256QAM modulation, 8 bits can be transmitted per symbol.

LTE system related

Figures 5 and 6 schematically illustrate the structure of a wireless frame applied to the present disclosure.

Referring to FIGS. 5 and 6, one radio frame includes 10 subframes, and one subframe includes two consecutive slots. The basic time (length) unit for transmission control in a radio frame is called a transmission time interval (TTI). The TTI can be 1 ms. The length of one subframe can be 1 ms, and the length of one slot can be 0.5 ms.

A slot may include multiple symbols in the time domain. For example, in the case of a wireless system using OFDMA (Orthogonal Frequency Division Multiple Access) in the downlink (DL), the symbol may be an OFDM (Orthogonal Frequency Division Multiplexing) symbol, and in the case of a wireless system using SC-FDMA (Single Carrier-Frequency Division Multiple Access) in the uplink (UL), the symbol may be an SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol. Meanwhile, the expression of a symbol period in the time domain is not limited by a multiple access method or name.

The number of symbols included in one slot may vary depending on the length of the CP (Cyclic Prefix). For example, in the case of a normal CP, one slot may include 7 symbols, and in the case of an extended CP, one slot may include 6 symbols.

A resource element (RE) represents the smallest time-frequency unit to which a modulation symbol of a data channel or a modulation symbol of a control channel is mapped. A resource block (RB) is a resource allocation unit and includes time-frequency resources corresponding to 180 kHz in the frequency axis and 1 slot in the time axis. Meanwhile, a resource block pair (PBR) means a resource unit that includes two consecutive slots in the time axis.

In the physical layer, several physical channels can be used, and the physical channels can be mapped to the radio frame and transmitted. As a downlink physical channel, the Physical Downlink Control Channel (PDCCH)/Enhanced PDCCH (EPDCCH) informs the UE of resource allocation of the PCH (Paging Channel) and the DL-SCH (Downlink Shared Channel) and HARQ (Hybrid Automatic Repeat Request) information related to the DL-SCH. The PDCCH/EPDCCH can carry an uplink grant that informs the UE of resource allocation of uplink transmission. The PDCCH and EPDCCH have differences in the resource areas to which they are mapped. The DL-SCH is mapped to the PDSCH (Physical Downlink Shared Channel). The Physical Control Format Indicator Channel (PCFICH) informs the UE of the number of OFDM symbols used for the PDCCH, and is transmitted in every subframe. PHICH (Physical Hybrid ARQ Indicator Channel) is a downlink channel that carries HARQ (Hybrid Automatic Repeat reQuest) ACK (Acknowledgement)/NACK (Non-acknowledgement) signals, which are responses to uplink transmissions. HARQ ACK/NACK signals can be called HARQ-ACK signals.

As an uplink physical channel, the Physical Random Access Channel (PRACH) carries a random access preamble. The Physical Upnlink Control Channel (PUCCH) carries uplink control information such as HARQ-ACK, which is a response to downlink transmission, and channel status information (CSI) indicating the downlink channel status, such as the Channel Quality Indicator (CQI), precoding matrix index (PMI), precoding type indicator (PTI), and rank indicator (RI). The Physical Uplink Shared Channel (PUSCH) carries the Uplink Shared Channel (UL-SCH).

Uplink data may be transmitted on a PUSCH, and the uplink data may be a transport block (TB), which is a data block for an UL-SCH transmitted during a TTI (Transmission Time Interval). The transport block may include user data. Alternatively, the uplink data may be multiplexed data. The multiplexed data may be a transport block for an UL-SCH and uplink control information multiplexed. That is, when there is user data to be transmitted on an uplink, the uplink control information may be multiplexed with the user data and transmitted through a PUSCH.

CIoT stands for Cellular IoT and can also be called NB-IoT (narrow band IoT), NB-CIoT, and NB-LTE.

Hereinafter, the NB-IoT system will be described as an example, but the embodiments of the present disclosure are not necessarily limited to the NB-IoT system, and may of course be applied to a 5G (5-generation) eMBB (enhanced mobile broadband) system or a mMTC (massive MTC) system. In addition, the LTE system will be described as a legacy system, but the present disclosure is not necessarily limited to the LTE system, and may of course be applied to other cellular systems.

A. NB-IoT System Deployment Scenario

The NB-IoT system occupies a narrow bandwidth. For example, the NB-IoT system can use a minimum system bandwidth of 200 kHz (or 180 kHz) in both the downlink (DL) and uplink (UL). Because of the narrow bandwidth occupancy, the NB-IoT system can be deployed standalone, within the guard-band of a legacy cellular system (e.g., an LTE system), or within the system bandwidth of the legacy cellular system.

Figure 7 is a diagram illustrating various deployment scenarios of an NB-IoT system.

Referring to (a) of Fig. 7, the NB-IoT system can be deployed in a standalone mode, for example, by re-farming (reusing for other communication services) a GSM carrier (700) having a bandwidth of 200 kHz.

Referring to (b) of FIG. 7, the LTE system may have a guard band of 200 kHz to 2 MHz (depending on the system bandwidth), and the NB-IoT system may be deployed in the guard band region (702) of the LTE system. The operation mode of the NB-IoT system deployed in the guard band region (702) may be referred to as a guard band mode.

Referring to (c) of FIG. 7, since the physical resource block (PRB) bandwidth of the LTE system is 180 kHz, the NB-IoT system can be placed within any PRB (704) within the entire bandwidth, and the operation mode of the NB-IoT system placed within any PRB (704) within the LTE bandwidth can be called in-band mode.

Additionally, it is possible to allocate multiple PRBs to an NB-IoT system to provide scalable capacity, which is beneficial from a resource utilization and frequency diversity perspective. The application of frequency hopping across multiple PRBs can provide further interference randomization and provide sufficiently separated PRBs and increased diversity gain. Operating with multiple PRBs is particularly desirable in the in-band mode, because the downlink transmit power of the NB-IoT system may be shared with legacy systems (e.g., LTE systems) and resources occupied by legacy control channels (e.g., physical downlink control channel (PDCCH) or reference signals (e.g., cell-specific reference signal (CRS)) will not be used by NB-IoT.

B. NB-IoT System Time/Frequency Resource Structure

Figure 8 is a diagram illustrating a resource grid corresponding to one subframe in an NB-IoT system.

NB-IoT system supporting in-band mode should be designed considering coexistence and compatibility with legacy LTE system. To avoid negative impact on legacy LTE system, LTE parameters (e.g., waveform, subcarrier spacing, etc.) can be reused for NB-IoT system as much as possible. In Fig. 8, resource grid of one PRB during one subframe of NB-IoT system is illustrated. As illustrated in Fig. 8, resource grid of NB-IoT system can be same as resource grid of LTE system. Fig. 8(a) illustrates resource grid in case of normal cyclic prefix (CP), and Fig. 8(b) illustrates resource grid in case of extended cyclic prefix (CP).

Figure 9 is a diagram illustrating the structure of an L-subframe in an NB-IoT system.

A more detailed time domain structure for an NB-IoT system is illustrated in Fig. 9. When only one PRB is used, a longer subframe unit (900) (e.g., an L-subframe including four subframes (920) (4 ms)) can be defined as the minimum scheduling unit. If a scheduling unit shorter than an L-subframe (900) is required, a longer slot (910) (e.g., an L-slot of 2 ms) can be considered.

Figure 10 is a diagram illustrating the structure of an L-superframe in an NB-IoT system.

Similarly, an L-frame (1010) having a duration of 40 ms can be defined, comprising 10 L-subframes (1000). The duration of the L-frame (1010) can be, for example, aligned with a physical broadcast channel (PBCH) transmission time interval (TTI) in an LTE system, where one PBCH of 4 repetitions is transmitted for 40 ms. One L-superframe (1020) can comprise 32 L-frames (1010) and have a duration of 1280 ms.

Figure 11 is a diagram illustrating the downlink time domain structure in an NB-IoT system.

Referring to FIG. 11, transmission channels are arranged in a TDM (time division multiplexing) manner. A synchronization sequence and broadcast information (e.g., system information such as a master information block (MIB)) may be transmitted together at the beginning (502) of an L-superframe (500). Typically, the synchronization sequence may include a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS). The MIB may include a limited amount of system information. The remaining system information not included in the MIB may be transmitted in a system information block (SIB) (504). Depending on coverage requirements, the MIB (502) and SIB (504) frames may be transmitted repeatedly.

Figure 12 is a diagram illustrating PSS/SSS transmission in an NB-IoT system.

When only one PRB is used in an NB-IoT system, the PSS and/or SSS can be repeated (transmitted) in one subframe to improve the detection performance of the synchronization sequence. Similar to the LTE system, the NB-IoT device can obtain basic system information, such as frame timing, CP length (normal CP or extended CP), whether it is frequency division duplex (FDD) mode or time division duplex (TDD) mode, and cell ID, by detecting the PSS/SSS. As shown in FIG. 12, by aligning the PSS (600) and the SSS (602) to different symbols within the subframe (610), the CP length and the FDD/TDD mode can be derived after successful PSS/SSS detection. Fig. 12 (a) exemplifies FDD mode and normal CP, Fig. 12 (b) exemplifies FDD mode and extended CP, Fig. 12 (c) exemplifies TDD mode and normal CP, and Fig. 12 (d) exemplifies TDD mode and extended CP.

In NB-IoT in-band mode, PSS/SSS need to avoid using reference signal occupied symbols (e.g., CRS (630) etc.) and control channel (e.g., PDCCH (620)) occupied symbols.

Figure 13 illustrates an example of PSS transmission in an NB-IoT system.

Referring to (a) of Fig. 13, PSS detection performance can be improved by arranging two consecutive symbols for PSS transmission.

Referring to (b) of Fig. 13, since the PSS signal is directly repeated, the 'A' portion (1302) of the PSS symbol (1300) can be considered as a virtual CP for the next PSS symbol (1310). In this case, the PSS can be detected regardless of whether a CP length is used (i.e., whether it is a normal CP or an extended CP). In addition, symbol-level correction becomes possible, and this symbol-level correction can reduce the complexity of PSS detection at the receiver.

Figure 14 illustrates an example of PBCH transmission in an NB-IoT system.

Fig. 14(a) illustrates RE (resource element) mapping of normal CP in in-band mode, Fig. 14(b) illustrates RE mapping of extended CP in in-band mode, Fig. 14(c) illustrates RE mapping of normal CP in guard band/independent mode, and Fig. 14(d) illustrates RE mapping of extended CP in guard band/independent mode. System information such as PBCH (MIB and/or SIB) and PSS/SSS can be transmitted in the same subframe. This is because PSS (800) and SSS (802) will not use all symbols in a subframe. And, PSS (800) and SSS (802) signals can be used for channel estimation for the PBCH decoding.

Referring to (a) and (b) of FIG. 14, in the in-band mode, REs (e.g., 806) not occupied by PSS (800)/SSS (802) within a subframe can be used for PBCH transmission. However, in the in-band mode, REs occupied by CRS (e.g., 804) may not be used in RE mapping for PBCH.

Referring to (c) and (d) of FIG. 14, in guardband mode or independent mode, since CRS is not transmitted, all REs except PSS/SSS symbols can be used for PBCH.

In NB-IoT in-band mode, the NB-IoT system and the LTE system can share the power of the base station in downlink transmission. Power boosting of arbitrary signals or transmission channels (e.g., PSS/SSS, MIB, SIB, or PDCCH) can be considered to improve the coverage performance of the in-band mode NB-IoT system.

Figure 15 is a diagram illustrating PSS/SSS/MIB transmission of an NB-IoT system in the time domain to avoid collision with PSS/SSS/MIB of a legacy system.

It is also possible to design NB-IoT PSS/SSS/MIB transmission to avoid collisions with legacy system PSS/SSS/MIB transmissions, if possible. For example, as illustrated in FIG. 15, in order to avoid collisions in the time domain, the S&B subframe (1500) and the SIB subframe (1502) transmitting NB-IoT PSS/SSS/MIB can be distributed in an appropriate manner. Alternatively, the NB-IoT PSS/SSS/MIB transmission subframe (1500) can be designed to avoid collisions with LTE PSS/SSS/MIB symbols, if possible. For example, the PSS/SSS can be designed differently from the case of LTE systems by positioning it in the last symbol in the subframe (1500).

Random access procedure

The performance of random access directly affects the user experience. In wireless communication systems, the random access process is used in various scenarios, such as initial link establishment, cell handover, uplink re-establishment, and RRC (Radio Resource Control) connection re-establishment, and is classified into contention-based random access and contention-free random access according to whether the user exclusively occupies the preamble sequence resource. For contention-based random access, each user selects a preamble sequence from the same preamble sequence resource when trying to establish the uplink, so there may be a case where multiple users select the same preamble sequence and transmit it to the base station. Therefore, the collision resolution mechanism becomes an important research direction in random access. How to reduce the collision probability and how to quickly resolve the occurred collision are key indicators affecting the random access performance.

FIG. 16 is a diagram showing an example of a random access procedure. The contention-based random access process includes four steps as illustrated in FIG. 16. In the first step, a user randomly selects one preamble sequence from a preamble sequence resource pool and transmits the preamble sequence to a base station. The base station performs correlation detection on the received signal to identify the preamble sequence transmitted by the user. In the second step, the base station transmits to the user a random access response (RAR) including an identifier of the random access preamble sequence, a timing advance command determined according to a time delay between the user and the base station, a Cell-Radio Network Temporary Identifier (C-RNTI), and time-frequency resources allocated for the user to perform uplink transmission next time. In the third step, the user transmits a third message (Msg3) to the base station according to the information of the RAR. Msg3 includes information such as terminal identifier of user device and RRC link request, where the terminal identifier of user device is unique to the user and is an identifier used for resolving collision. In the fourth step, the base station sends a collision resolution identifier to the user, where the collision resolution identifier includes an identifier of the user device corresponding to the user who wins the collision resolution. When the user detects its own identifier, the user upgrades TC-RNTI to C-RNTI, sends an ACK (Acknowledgement) signal to the base station to complete the random access process, and waits for the scheduling of the base station. Otherwise, the user will start a new random access process after a certain delay.

In the case of a contention-free random access process, since the base station knows the user's identifier, it can assign a preamble sequence to the user. Therefore, when transmitting a preamble sequence, the user does not need to randomly select a sequence, but instead uses the assigned preamble sequence. Upon detecting the assigned preamble sequence, the base station will transmit a corresponding random access response, where the random access response includes information such as timing advance and uplink resource allocation. Upon receiving the random access response, the user considers the uplink synchronization to be completed and waits for further scheduling by the base station. Therefore, the contention-free random access process includes only two steps: a first step of transmitting a preamble sequence and a second step of transmitting a random access response.

Hereinafter, a method for performing uplink transmission proposed in the present disclosure is specifically described. The method proposed in the present disclosure relates to a method for performing uplink transmission based on random access/random access.

In wireless communication systems such as IoT systems, a terminal (/device) transmits an uplink signal (/data) to a base station (/network) through random access. In general, IoT devices operate using batteries, so in order to extend the life of the batteries used by IoT devices, it is necessary to minimize the power consumed when performing data through random access.

Among terminals transmitting uplink signals to a single base station, there may be terminals having good channel conditions between the terminal and the base station, but there may also be terminals having poor channel conditions between the terminal and the base station, for example, because the terminal is located far away from the base station or because there is an obstacle between the terminal and the base station that interferes with communication between the terminal and the base station. In this case, in the case of a terminal having good channel conditions, there is no problem in transmitting a signal to the base station, but in the case of a terminal having poor channel conditions, the terminal must transmit data to the base station at a very low transmission rate, so it may take a long time to transmit a single packet. In addition, when a slotted ALOHA method is used to reduce collisions between terminals that occur during random access, a terminal having good channel conditions can transmit a packet in a single slot, whereas a terminal having poor channel conditions must transmit a packet over multiple slots. If packet transmission is performed for a long time, the transmission power increases, which may shorten the battery life of the terminal. In addition, if packet transmission is performed for a long period of time, the probability of collision with other terminals increases, which may lead to an increase in packet retransmissions by the terminal, which may cause an additional problem of further shortening the lifespan of the terminal.

FIG. 17 is a diagram showing an example in which multiple terminals perform random access. Referring to FIG. 17, terminal 1 (1710) and terminal 2 (1720) represent terminals with good channel conditions, and terminal 3 (1730) represents a terminal with bad channel conditions. Since terminal 1 (1710) and terminal 2 (1720) are terminals with good channel conditions, they transmit uplink signals/packets in one slot. On the other hand, terminal 3 (1730) is a terminal with bad channel conditions, so it transmits uplink signals/packets across multiple slots. At this time, when a specific terminal selects a slot to transmit an uplink signal/packet, let the probability that a collision occurs between terminals when another terminal transmits an uplink signal/packet in the same slot as the slot selected by the specific terminal be p. In Fig. 17, if the number of slots through which the uplink signal/packet of terminal 3 is transmitted is n, and all terminals in Fig. 17 independently transmit the uplink signal/packet, the collision probability becomes 1 - (1 - p)n, and as the value of n increases, the collision probability increases rapidly, which increases retransmissions and shortens the battery life of the terminals. For example, if p is 0.2 and there are only devices with good channels, this is not a big problem, but if n is 8, the collision probability increases to 0.832, which excessively increases retransmissions.

When performing random access of multiple terminals, in order to prevent collisions between terminals, the collision probability p can be made small, but this may not be appropriate because the number of terminals performing random access must be reduced in order to reduce the collision probability p. Another method to prevent collisions between terminals is to divide the resource area according to the n value, and to allocate resources for random access differently to the terminals. In this case, the probability that a signal/packet of a terminal with a bad channel will collide with a signal/packet of another terminal can be reduced, but excessive resources are allocated to the terminal with a bad channel, and other terminals with a good channel condition have no choice but to perform random access competitively within a relatively narrow resource, so that the collision probability between other terminals increases significantly overall, and thus the system performance may deteriorate. Therefore, a method is needed that can reduce the collision probability of a terminal with a bad channel without negatively affecting the random access performance of a terminal with a good channel, and the present disclosure proposes a solution thereto. In addition, the present disclosure proposes a method for reducing power consumption due to retransmission by reducing errors occurring during random access of a terminal with poor channel conditions in an IoT system.

In addition, according to the method proposed in the present disclosure, the time/timing at which the base station's response (ack) to the uplink signal of the terminal is transmitted can be set differently based on the number of slots 'n' occupied by (one) packet included in the uplink signal transmitted by the terminal. More specifically, when the value of the number of slots 'n' occupied by (one) packet included in the uplink signal transmitted by the terminal is 1, the base station immediately performs detection and decoding on the signal received by the base station from the terminal, and transmits a response to the received signal to the terminal. On the other hand, when the number of slots 'n' occupied by (one) packet included in the uplink signal transmitted by the terminal increases, the base station stores the signal received by the base station from the terminal in the base station's buffer, and then delays the time at which the base station performs detection and decoding on the signal received by the base station from the terminal by a larger value. At this time, as the time at which the base station performs detection and decoding on the signal received by the terminal is delayed by a larger value, the response time of the base station to the received signal is also delayed according to n.

The number of slots 'n' occupied by (one) packet included in the uplink signal transmitted by the terminal can have one of N values from n1 to nN as shown in the mathematical expression 1 below.

In mathematical expression 1, n1 is assumed to be 1, and if the response time according to n is AckDelay(n), the response time of the base station can be determined as in mathematical expression 2 below.

The base station can store the received signal in a buffer for a maximum delay AckDelay(nN) time, and perform detection and decoding on the received signal just before reaching a time point for transmitting a response to the received signal, and then transmit a response to the terminal. Since the time point of the base station's response to a signal based on a packet with a large n value is delayed in proportion to the size of the n value, before a response to a signal based on a packet with a large n value is transmitted, the terminal performs retransmission of a signal based on a packet with a shorter length than that. At this time, if the base station succeeds in detecting/decoding the signal retransmitted by the terminal, the base station finds a slot in which the signal was transmitted before the retransmitted signal based on the detected/decoded retransmitted signal, restores the signal, and subtracts the restored signal from signals received in the slot in which the signal was transmitted before the retransmitted signal, thereby eliminating interference. Here, signals received in the slot where the interference occurred are stored in the base station buffer, and the interference removal can be performed by removing a signal corresponding to a signal restored through a retransmitted signal from the signals stored in the base station buffer. After interference removal is completely performed in the slot where the interference occurred, the base station detects a signal in the slot where the interference occurred to determine whether reception was successful. By delaying the time point of the base station's response transmission in proportion to the size n of the data packet, a terminal that has transmitted a signal including a data packet having a large value of n can successfully transmit the data packet without performing retransmission. Additionally, if the base station succeeds in receiving (detecting/restoring) the signal transmitted by the terminal, it can be agreed in advance between the terminal and the base station that the base station will not transmit a response (ACK). That is, a terminal that has not received a response (ACK) even after the time point of the response transmission set based on the value n can assume that the base station has successfully received the signal. At this time, in addition to the effect that a terminal that has transmitted a signal including a data packet with a large value of n as described above can successfully transmit a data packet without performing retransmission, since the base station does not need to transmit a response (ACK), the signaling overhead for the base station's response transmission can be reduced, and resources that should be used for response (ACK) transmission can be used for other purposes, so that the efficiency of resource use can be improved.

From the perspective of the terminal with respect to the content described above, the time/timing at which the base station's response (ack) to the uplink signal of the terminal is received can be set differently based on the number 'n' of slots occupied by (one) packet included in the uplink signal transmitted by the terminal. That is, the time/timing at which the terminal expects to receive the base station's response (ack) to the uplink signal of the terminal can be set differently based on the number 'n' of slots occupied by (one) packet included in the uplink signal transmitted by the terminal. More specifically, the terminal can expect that (1) the base station can store the received signal in a buffer for the maximum delay AckDelay(nN) time, and (2) the base station detects and decodes the received signal just before reaching the time point for transmitting the response to the received signal and then transmits the response to the terminal. Since the time point of the base station's response to a signal based on a packet with a large n value is delayed in proportion to the size of the n value, a terminal that transmitted a signal based on a packet with a shorter length retransmits the signal before the terminal that transmitted the signal based on the packet with a large n value receives the response. At this time, the terminal can expect that (1) if the base station succeeds in detecting/decoding the retransmitted signal, the base station finds the previously transmitted slot based on the detected/decoded retransmitted signal, restores the packet signal, and subtracts it from the received signal to eliminate interference, and (2) after all interference is eliminated, the signal is detected to determine whether reception was successful and transmits a response. By delaying the time point at which the terminal expects to receive a response from the base station in proportion to the size n of the data packet, a terminal that transmitted a signal including a data packet with a large n value can successfully transmit the data packet without performing retransmission. Additionally, if the base station succeeds in receiving (detecting/recovering) the signal transmitted by the terminal, it can be agreed in advance between the terminal and the base station that the terminal does not expect to receive a base station response. That is, if a terminal has not received a response (ACK) by the time of receiving a response set based on the value of n, the terminal may assume that the base station succeeded in receiving the signal transmitted by the terminal and may not perform retransmission. In this case, in addition to the effect that a terminal that has transmitted a signal including a data packet having a large value of n as described above can successfully transmit the data packet without performing retransmission, since the base station does not need to transmit a response (ACK), the signaling overhead for the base station's response transmission can be reduced, and since resources that should be used for transmitting a response (ACK) can be used for other purposes, there is an effect that the efficiency of resource use can be improved.

In the present disclosure, an uplink signal transmitted by a terminal through a random access procedure may include user data. In addition, the uplink signal may include a random access preamble. When the terminal transmits the random access preamble, the terminal may repeatedly transmit the random access preamble a specific number of times. At this time, the number of times the random access preamble is repeatedly transmitted may be set to the terminal through higher layer signaling (RRC, MAC). When the terminal repeatedly transmits the random access preamble, the time point at which the terminal expects reception of a response from a base station may be the time point that includes the end of the random access preamble that the terminal last repeatedly transmitted plus a specific time offset per subframe. At this time, the terminal may receive/detect a response from the base station during a response window that is set for a specific time interval from the time point at which the terminal expects reception of a response from the base station.

In addition, before the terminal performs the random access procedure, parameters related to the channel for performing the random access procedure can be set to the terminal through upper layer signaling (RRC, MAC). The channel for performing the random access procedure can be a physical random access channel (PRACH), a narrow band physical random access channel (NPRACH), etc.

Hereinafter, with reference to FIG. 18, a method for identifying/determining the slot position of a packet transmitted before a retransmitted packet by a base station when performing an interference removal operation of the base station is described.

Figure 18 is a diagram showing another example in which multiple terminals perform random access.

Referring to FIG. 18, terminal 1 (1810) and terminal 2 (1820) represent terminals with good channel conditions, and terminal 3 (1830) represents a terminal with poor channel conditions. Since terminal 1 (1810) and terminal 2 (1820) represent terminals with good channel conditions, they transmit uplink signals/packets in one slot. On the other hand, terminal 3 (1830) represents a terminal with poor channel conditions, and thus transmits uplink signals/packets across multiple (n) slots. At this time, when a specific terminal selects a slot to transmit an uplink signal/packet, another terminal may transmit an uplink signal/packet in the same slot as the slot selected by the specific terminal, resulting in a collision between the terminals. The scenario of FIG. 18 is merely for convenience of explanation, and the method proposed in the present disclosure is not to be interpreted as being limited to the scenario assumed in FIG. 18.

Considering terminals transmitting one packet in one slot, when the slot number of each slot is defined as 'SlotNumber', a 'superframe', which is a time resource unit composed of M slot units based on the SlotNumber, and a 'slot position within the superframe' can be defined as in the following mathematical expression 3.

Here, div is the 'quotient' of the division operation result, and mod is the 'remainder' of the division operation result.

Each terminal can randomly determine a slot position within a superframe to reduce collisions with other terminals when performing initial transmission. In the present disclosure, each terminal can determine a slot position SlotPosition0 at which to perform initial transmission using a hash function when performing initial transmission.

When the superframe in which the terminal can perform initial transmission is called SuperFrame0, ID is the device ID, and SN is the sequence number of the packet, the hash function used to determine the slot position SlotPosition0 in which to perform initial transmission is defined as shown in the following mathematical expression 4.

SlotPosition0 determined according to the above mathematical expression 4 is based on ID, SN, and SuperFrame0, so it may have a random tendency as it has different values for each terminal, each packet sequence number, and each superframe.

When a terminal performs retransmission for a failed transmission due to failure of uplink transmission, the superframe interval dk of the kth retransmission and the k-1th retransmission (the 0th retransmission is regarded as the initial transmission) can be randomly determined between the minimum interval Dmin and the maximum interval Dmin + CWk - 1. CWk represents the contention window of the kth retransmission.

Mathematical expression 5 below is an equation for the superframe interval dk of the kth retransmission and the k-1th retransmission (the 0th retransmission is considered the initial transmission).

The above dk value is determined by the mathematical expression 6 below, which uses a hash function.

Since dk determined by the above mathematical expression 6 is set based on ID, SN, and k, it may exhibit a random tendency.

In addition, when the super frame in which the terminal performs the kth retransmission is determined, the slot position in which the terminal performs the retransmission within the determined super frame is determined as shown in mathematical expression 7 below.

The slot location in which the packet is transmitted, determined by the above mathematical formulas, may appear to be random, but when the base station receives a packet, if the received packet is a retransmitted packet, it can know the slot location of the packet transmitted before the retransmitted packet.

More specifically, when the base station receives a packet transmitted by a terminal at a specific SlotNumber, the number of retransmissions of the packet k can be determined by the following mathematical expression 8.

Although the k value is expressed as the number of retransmissions, more precisely, the k value can be determined as the 'number of retransmissions mod M' rather than the number of retransmissions. That is, if the number of retransmissions is M, the k value can be determined as 0. If the value of k is not 0, the packet is a retransmitted packet, and the position of the superframe in which the packet before the retransmitted packet was transmitted can be determined as in the mathematical expression 9 below.

If the super frame in which the packet prior to the retransmitted packet was transmitted is determined by the mathematical expression 9 above, the slot position in which the packet prior to the retransmitted packet was transmitted within the super frame can be determined by the mathematical expression 10 below.

When the slot position in which a packet prior to a retransmitted packet was transmitted within a superframe in which a packet prior to a retransmitted packet was transmitted is determined by the above mathematical expression 9, the SlotNumber can be determined by the following mathematical expression 11.

The base station restores the retransmitted packet signal based on the SlotNumber determined by the above mathematical expression 11, obtains a signal corresponding to the retransmitted packet signal from among all received signals at the time corresponding to the SlotNumber, removes it from all received signals, and then performs signal detection to obtain other signals received at the time corresponding to the SlotNumber. Referring to FIG. 18, the base station performs interference removal for signals transmitted by terminal 1 and terminal 2 (1810 and 1820) through the above method, and can restore the signal transmitted by terminal 3 (1830) without transmitting a NACK to terminal 3 (1830).

When the terminal performs the k+1th transmission, the base station can find the slot number of the kth transmission in the same way as described above, remove the signal, and perform signal detection to find another signal. If retransmission is performed M times, the number of retransmissions is recognized as 0, so the base station cannot perform interference removal. When retransmission is performed K times, the number of times interference can actually be removed is K mod M. The interference removal operation at the base station can be preferably performed within the maximum delay AckDelay(nN).

In this way, interference caused by signals of short packets can be removed at the time of interference occurrence without separate signaling, and since signal detection for devices with bad channels is performed after interference removal is complete, a response can be transmitted depending on the success or failure. M is correlated with the number of retransmissions to remove interference, and if the value of M is set large, interference of more retransmission signals can be removed, but the implementation complexity increases and the transmission time may be delayed. If the collision probability is not very large, most packets can be successfully transmitted through a small number of retransmissions, so it may not be necessary to make M unnecessarily large. In addition, since only interference removal within the delayed response time is meaningful, performance improvement may not be large even if M is increased. Therefore, it may be desirable to set the value of M appropriately by considering the above factors.

effect

According to the method proposed in the present disclosure, when a terminal transmits a packet to a base station, the response time of the base station (the point in time at which the terminal expects to receive a response) is determined according to the packet length, so that the terminal can know in advance when a response to the transmitted packet will be received after transmitting the packet, and thus the terminal can stop the receiving operation after performing data transmission and perform the receiving operation only when the response is expected to be received, so that the terminal power can be used efficiently.

In addition, according to the present disclosure, by reducing errors occurring during random access of a terminal with a poor channel condition, the number of retransmissions of the terminal with a poor channel condition can be reduced, and power consumption of the terminal with a poor channel condition can also be reduced according to the reduced number of retransmissions.

FIG. 19 is a flowchart illustrating an example of a method for transmitting an uplink signal based on a random access procedure proposed in the present disclosure performed at a terminal.

First, the terminal receives setting information on channel parameters related to a random access procedure from the base station (S1910).

Next, the terminal transmits the uplink signal to the base station based on the setting information (S1920).

Thereafter, the terminal receives a response message for the uplink signal from the base station (S1930).

At this time, the reception timing at which the terminal receives the response message is determined based on the length of information included in the uplink signal.

Additionally, the terminal includes one or more transceivers, one or more processors, and one or more memories that store instructions for operations to be executed by the one or more processors and are connected to the one or more processors, and performs the operations described in FIG. 19.

Additionally, in a device including one or more memories and one or more processors functionally connected to the one or more memories, the one or more processors control the device to perform the operations described in FIG. 19.

Additionally, one or more non-transitory computer-readable media storing one or more instructions, wherein the one or more instructions, executable by one or more processors, control the terminal to perform the operations described in FIG. 19.

FIG. 20 is a flowchart illustrating an example of a method for receiving an uplink signal based on a random access procedure proposed in the present disclosure performed at a base station.

First, the base station transmits setting information on channel parameters related to a random access procedure to the terminal (S2010).

Next, the base station receives the uplink signal from the terminal based on the setting information (S2020).

Thereafter, the base station transmits a response message for the uplink signal to the terminal (S2030).

At this time, the transmission timing at which the base station transmits the response message is determined based on the length of information included in the uplink signal.

Additionally, the base station includes one or more transceivers, one or more processors, and one or more memories that store instructions for operations to be executed by the one or more processors and are connected to the one or more processors, and performs the operations described in FIG. 20.

Additionally, in a device including one or more memories and one or more processors functionally connected to the one or more memories, the one or more processors control the device to perform the operations described in FIG. 20.

Additionally, one or more non-transitory computer-readable media storing one or more instructions, wherein the one or more instructions, executable by one or more processors, control the base station to perform the operations described in FIG. 20.

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

Below, devices to which various embodiments of the present disclosure can be applied are described.

Although not limited thereto, the various descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document may be applied to various fields requiring wireless communication/connectivity (e.g., 5G) between devices.

Here, the wireless communication technology implemented in the wireless device (100, 200) of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented with standards such as LTE Cat NB1 and/or LTE Cat NB2, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the wireless device (100, 200) of the present disclosure may perform communication based on LTE-M technology. At this time, for example, LTE-M technology may be an example of LPWAN technology, and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, the LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the wireless device (100, 200) of the present disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-described names. For example, the ZigBee technology can create PAN (personal area networks) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and may be called by various names.

The embodiments described above are combinations of components and features of the present disclosure in a given form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, it is also possible to combine some components and/or features to form an embodiment of the present disclosure. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that claims that do not have an explicit citation relationship in the scope of the patent may be combined to form an embodiment or may be included as a new claim by post-application amendment.

Embodiments according to the present disclosure may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In case of hardware implementation, an embodiment of the present disclosure may be implemented by one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, one embodiment of the present disclosure may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory and may be driven by a processor. The memory may be located inside or outside the processor and may exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the essential characteristics of the present disclosure. Accordingly, the above detailed description should not be construed as limiting in all respects but should be considered as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present disclosure are intended to be included in the scope of the present disclosure.

Claims (15)

A method for transmitting an uplink signal based on a random access procedure by a terminal in a wireless communication system,
A step of receiving, from a base station, setting information on channel parameters related to a random access procedure;
A step of transmitting the uplink signal to the base station based on the setting information; and
A step of receiving a response message for the uplink signal from the base station,
A method characterized in that the reception timing at which the terminal receives the response message is determined based on the length of information included in the uplink signal. In paragraph 1,
A method characterized in that the reception timing is delayed in proportion to the length of information included in the uplink signal. In the second paragraph,
A method further comprising the step of determining a position of a slot in which the uplink signal is to be transmitted within a super frame, which is a time unit including at least one slot. In the third paragraph,
A method characterized in that the position of a slot in which the uplink signal is transmitted within the superframe is determined based on (i) a superframe number, (ii) a packet sequence number of information included in the uplink signal, and (ii) an identifier (ID) of the terminal. In the second paragraph,
A method characterized by further comprising a step of performing decoding on the response message at a reception timing determined based on the length of information included in the uplink signal. In paragraph 5,
Further comprising a step of performing retransmission of the uplink signal based on the response message to the base station,
A method characterized in that the above retransmission is performed after the above reception timing. In paragraph 6,
A method characterized in that the above retransmission is performed in another superframe located a specific time interval later than the superframe in which the uplink signal was transmitted. In paragraph 7,
A method characterized in that a specific time interval is determined based on (i) a packet sequence number of information included in the uplink signal, (ii) an identifier (ID) of the terminal, and (iii) a retransmission count indicating which retransmission the retransmitted uplink signal is. In paragraph 1,
A method characterized in that the information included in the above uplink signal is a random access preamble. In paragraph 1,
A method characterized in that the information included in the above uplink signal is user data. A terminal transmitting an uplink signal based on a random access procedure in a wireless communication system,
One or more transmitters and receivers;
one or more processors; and
storing instructions for operations to be executed by said one or more processors, and including one or more memories connected to said one or more processors;
The above actions are,
A step of receiving, from a base station, setting information on channel parameters related to a random access procedure;
A step of transmitting the uplink signal to the base station based on the setting information; and
A step of receiving a response message for the uplink signal from the base station,
A terminal, characterized in that the reception timing at which the terminal receives the response message is determined based on the length of information included in the uplink signal. A method for a base station to receive an uplink signal based on a random access procedure in a wireless communication system,
A step of transmitting, to a terminal, configuration information on channel parameters related to a random access procedure;
A step of receiving the uplink signal from the terminal based on the setting information; and
Including a step of transmitting a response message to the uplink signal to the terminal,
A method characterized in that the transmission timing at which the base station transmits the response message is determined based on the length of information included in the uplink signal. A base station that receives an uplink signal based on a random access procedure in a wireless communication system,
One or more transmitters and receivers;
one or more processors; and
storing instructions for operations to be executed by said one or more processors, and including one or more memories connected to said one or more processors;
The above actions are,
A step of transmitting, to a terminal, configuration information on channel parameters related to a random access procedure;
A step of receiving the uplink signal from the terminal based on the setting information; and
Including a step of transmitting a response message to the uplink signal to the terminal,
A base station, characterized in that the transmission timing at which the base station transmits the response message is determined based on the length of information included in the uplink signal. In a device comprising one or more memories and one or more processors functionally connected to the one or more memories,
The one or more processors execute instructions for operations performed by the device,
The above actions are,
A step of receiving, from a base station, setting information on channel parameters related to a random access procedure;
A step of transmitting the uplink signal to the base station based on the setting information; and
A step of receiving a response message for the uplink signal from the base station,
A device characterized in that the reception timing at which the terminal receives the response message is determined based on the length of information included in the uplink signal. In one or more non-transitory computer-readable media storing one or more instructions, the one or more instructions being executable by one or more processors, the one or more instructions comprising operations performed by a terminal,
The above actions are,
A step of receiving, from a base station, setting information on channel parameters related to a random access procedure;
A step of transmitting the uplink signal to the base station based on the setting information; and
A step of receiving a response message for the uplink signal from the base station,
A computer-readable medium, characterized in that the reception timing at which the terminal receives the response message is determined based on the length of information included in the uplink signal.

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