TW202135549A - Terminal configured to perform vehicle-to-everything communication - Google Patents

Abstract

An operating method of a terminal configured to perform vehicle-to-everything (V2X) communication in a wireless communication system, including signaling a maximum physical sidelink feedback channel (PSFCH) receiving capability to a base station; and receiving a wireless signal transmitted from the base station based on the maximum PSFCH receiving capability, wherein the maximum PSFCH receiving capability is a maximum number of PSFCHs receivable during one time transmission interval (TTI).

Description

Terminal configured to perform car networking

The present disclosure relates to a device and method for efficiently transmitting and receiving a physical side link feedback channel (PSFCH) to perform vehicle-to-vehicle (V2X) communication in a wireless communication system.

In order to meet the increasing demand for wireless data communications after the commercialization of the fourth generation (4th generation, 4G) communication system, efforts have been made to develop the fifth generation (5th generation, 5G) communication system.

Therefore, 5G communication systems have recently been commercialized. In order to achieve a high data transmission rate, a 5G communication system can be implemented in an ultra-high frequency band (for example, a millimeter wave (mmWave) frequency band or, for example, a 60 gigahertz (gigahertz, GHz) frequency band). In order to reduce the path loss of radio waves and increase the distance that radio waves travel in the ultra-high frequency band, beamforming technology and massive multiple-input and multiple-output (MIMO) have been or will be applied to 5G communication systems. Technology, full-dimensional MIMO (FD-MIMO) technology, array antenna, analog beamforming technology and large antenna technology.

In addition, in order to improve the network of the communication system, the following technologies have been or will be applied to the 5G communication system: evolved small cell, advanced small cell, cloud radio access network (cloud radio access network, cloud RAN), Ultra-dense network, device-to-device communication (D2D), wireless backhaul, mobile network, cooperative communication, coordinated multi-point (CoMP) and reception interference cancellation.

In addition, advanced coding modulation (ACM) technologies (such as hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding control have been applied or will be applied to 5G communication systems. Sliding window superposition coding (SWSC) and advanced access technologies (such as filter bank multi-carrier (FBMC), non-orthogonal multiple access, NOMA) And sparse code multiple access (sparse code multiple access, SCMA)).

In addition, unlike the long-term evolution (LTE) V2X communication that only supports broadcast, unicast is also supported in the new radio (new-ratio, NR) V2X communication in the 16th version (release-16, Rel-16) (Unicast) and groupcast (groupcast). In addition, a physical sidelink feedback channel (PSFCH) has been newly defined to improve the reliability of unicast and multicast. Therefore, a transmitting terminal (such as a terminal configured to transmit a signal and/or channel) can receive an acknowledgement/negative-acknowledgement (acknowledgement/negative-acknowledgement) from a receiving terminal (such as a terminal configured to receive a signal and/or channel) through the PSFCH , ACK/NACK) feedback, and therefore, may be able to perform hybrid automatic repeat request (HARQ).

For reference, a low peak-to-average power ratio (PAPR) sequence based on the Zadoff-Chu sequence can be applied to the PSFCH, and the 1-bit HARQ-ACK/NACK contained in the PSFCH can have the above Sequence format. In addition, PSFCH can be transmitted in units of 1 resource block (RB), and code division multiplexing (CDM) can be applied to PSFCH, so that multiple users (or terminals) can use one The RB transmits PSFCH.

However, since the transmitting terminal can simultaneously receive HARQ ACK/NACK from multiple receiving terminals in the multicast mode, as the number of receiving terminals included in the group increases, the number of PSFCHs to be received by the transmitting terminal may increase. However, since the current 3rd generation partnership project (3rd generation partnership project, 3GPP) standard does not define the maximum number of PSFCHs that can be sent and received by the terminal, depending on the situation, the number of PSFCHs received may exceed the number of PSFCHs transmitted. PSFCH receiving capability of the terminal. In addition, since the transmitting terminal has to determine whether all PSFCHs received from the multiple receiving terminals are ACK or NACK, the operation of determining whether the PSFCH is ACK or NACK can increase the workload on the transmitting terminal.

Provided is an apparatus and method for efficiently transmitting and receiving a physical side link feedback channel (PSFCH) to perform vehicle networking (V2X) communication in a wireless communication system.

Part of it will be stated in the following description and will be partly clear based on the description or additional aspects can be learned by practicing the presented embodiments.

According to the aspect of the present disclosure, an operation method of a terminal configured to perform vehicle-to-everything (V2X) communication in a wireless communication system includes transmitting the largest physical side link feedback channel (PSFCH) reception to the base station Capability, wherein the maximum PSFCH receiving capability is the maximum number of PSFCHs that can be received during a time transmission interval (TTI).

According to the aspect of the present disclosure, a method for a terminal configured to perform vehicle-to-vehicle (V2X) communication in a wireless communication system includes: transmitting a maximum physical side link feedback channel (PSFCH) transmission capability to a base station, wherein the maximum The PSFCH transmission capability is the maximum number of PSFCHs that can be transmitted during a time transmission interval (TTI).

According to aspects of the present disclosure, a terminal configured to perform V2X communication includes: a transceiver configured to transmit and receive one or more wireless signals; and a processor configured to control the transceiver Transmit a message to the base station for the maximum physical side link feedback channel (PSFCH) receiving capability, where the maximum PSFCH receiving capability is the maximum number of PSFCHs that can be received during a time transmission interval (TTI).

According to aspects of the present disclosure, a terminal configured to perform V2X communication includes: a transceiver configured to transmit and receive one or more wireless signals; and a processor configured to control the transceiver A transmission is transmitted to the base station for the maximum physical side link feedback channel (PSFCH) transmission capability, where the maximum PSFCH transmission capability is the maximum number of PSFCHs that can be transmitted during a time transmission interval (TTI).

According to an aspect of the present disclosure, a terminal configured to perform V2X communication includes: a transceiver configured to transmit and receive one or more wireless signals; and a processor configured to: control the transceiver The device measures the reference signal received power (RSRP) or signal-to-interference and noise of k PSFCHs in multiple physical side-link feedback channels (PSFCH) received during a time transmission interval (TTI) Signal-to-interference & noise ratio (SINR), where k is an integer greater than 1; rank the k PSFCHs based on the RSRP or the SINR in ascending powers; control the transceiver to perform The ascending power determines whether the k PSFCHs that are sorted are a hybrid automatic repeat request (HARQ) acknowledgement (ACK) or a HARQ negative-acknowledgement (NACK); and based on the sequential determination, it is determined whether The physical sidelink shared channel (PSSCH) will be retransmitted.

According to aspects of the present disclosure, a terminal configured to perform V2X communication includes: a transceiver configured to transmit and receive one or more wireless signals; and a processor configured to control the transceiver , Wherein the processor is further configured to: control the transceiver to measure the reference signal received power (RSRP) or signal of multiple physical side link feedback channels (PSFCH) received during a time transmission interval (TTI) To interference and noise ratio (SINR); select k PSFCHs satisfying a preset criterion from the plurality of PSFCHs, where k is an integer greater than 1; based on the RSRP or the SINR to increase the power of the selected PSFCH The k PSFCHs are sorted; the transceiver is controlled to determine whether the k PSFCHs sorted are hybrid automatic repeat request (HARQ) acknowledgment (ACK) or HARQ negative acknowledgment (NACK) in the ascending order; and Based on the sequential determination, it is determined whether the physical side link shared channel (PSSCH) will be retransmitted.

Hereinafter, the embodiments will be explained in detail with reference to the drawings.

Various exemplary embodiments will now be explained more fully with reference to the accompanying drawings in which some exemplary embodiments are shown. However, the embodiments may be implemented in different forms and should not be construed as being limited to the embodiments described herein. The embodiments are interchangeable with each other. Rather, these embodiments are provided for the purpose of making this disclosure thorough and complete, and for the purpose of fully conveying the scope to those skilled in the art. Even when the content described in a specific embodiment is not described in other embodiments, the content can also be understood as related to other embodiments, unless otherwise stated or the content makes the specific embodiment different from other embodiments. Contradictory in the embodiment. Throughout this specification, the same numbers generally refer to the same elements.

The terms used herein are only to illustrate specific embodiments and are not intended to limit the scope of other embodiments. Unless clearly indicated otherwise in the context, the expression in the singular form may include the expression in the plural form. It should be understood that the term "comprises, comprising, includes, and/or including" as used herein refers to the existence of the stated features, items, steps, operations, elements and/or components, but does not exclude one or The existence or addition of multiple other features, items, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms used in this article (including technical terms and scientific terms) should be interpreted according to the idiomatic meaning of the technology to which this disclosure belongs. It should be understood that commonly used terms should also be interpreted in the usual meanings of related technologies, and should not be interpreted in ideal or over-formalized meanings, unless explicitly defined as such in this article.

In addition, the embodiments will be described in detail by focusing on the New Radio (NR) system and the Long Term Evolution (LTE)/LTE-Advanced (LTE-A) system. However, according to the judgment of those skilled in the art, with slight modifications within the scope of the present disclosure, the described embodiments can be applied not only to other communication systems with similar technical backgrounds, but also to the use of licensed frequency bands and non-licensed frequency bands. Other communication systems in licensed frequency bands.

Before the following detailed description, the definitions of several words and phrases used throughout this specification will be explained. The expression "connect (combined/access) to" and its derivatives can refer to any direct or indirect communication between at least two components, regardless of whether the at least two components are in physical contact with each other. The terms "transmit", "receive" and "communication" and their derivatives can include both direct communication and indirect communication. The term "comprising (comprising and including)" and its derivatives can refer to including but not limited to. The term "or" can be an inclusive word meaning "and/or". The expression "related to..." and its derivatives can refer to including..., included in, interconnected with, containing, contained in, connected to.../connected with, Combine to.../Combine with..., communicate with..., collaborate with..., sandwich..., lie parallel to..., be close to..., bound by..., have..., are characterized by..., Have a relationship with... and so on. The term "controller" refers to a device, system, or part thereof that controls at least one operation. The controller can be implemented in hardware or a combination of hardware and software and/or firmware. The functions related to any particular controller can be centralized or distributed locally or remotely. When the expression "at least one of..." is before the list of items, any and all combinations of one or more of the listed items may be used, or only one of the listed items may be required. For example, the expression "at least one of A, B, and C" may include at least one of A, B, C, both A and B, both A and C, both B and C, and A, B And the combination of C.

The various functions described below can be implemented or supported by one or more computer programs. Each of the one or more computer programs can be composed of computer-readable code and executed on a computer-readable medium . The terms "application" and "program" used in this article refer to one or more computer programs, software components, instruction sets, programs, functions, objects, categories, examples, Relevant information or part of it. The term "computer readable code" includes all types of computer code, including source code, object code, and execution code. The term "computer readable media" includes all types of media that can be accessed by a computer, such as read-only memory (ROM), random access memory (RAM), and hard disk drives. (Hard disc drive, HDD), compact disc (CD), digital video disc (DVD) or any other type of memory. "Non-transitory" computer readable media exclude wired links, wireless links, optical links, or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer readable media include media in which data can be permanently stored and media in which data can be stored and later overwritten (such as rewritable optical discs or removable memory devices).

In the various embodiments described below, the hardware access method will be explained as an example. However, various embodiments include technologies that use both hardware and software, and therefore, various embodiments do not exclude software-based access methods.

In the following description, for the sake of brevity, terms referring to control information, terms referring to items, terms referring to network entities, terms referring to messages, and terms referring to device components are provided as examples. Therefore, the embodiments are not limited by the terms described below, and other terms having equivalent technical meanings may be used instead.

FIG. 1 is a diagram for explaining a unicast, group broadcast, and physical side link feedback channel (PSFCH) transmission process performed between terminals through a side link according to an exemplary embodiment.

FIG. 1 shows a plurality of terminals configured to perform V2X communication according to an embodiment, such as a first terminal 21, a second terminal 23, a third terminal 25, a fourth terminal 27, a fifth terminal 29, and a sixth terminal. The terminal 31, the seventh terminal 33, and the eighth terminal 35.

First, it can be seen that the communication scheme between the first terminal 21 and the second terminal 23 is one-to-one communication, that is, unicast communication performed by a side link.

Although FIG. 1 shows an example in which a signal is transmitted from the first terminal 21 to the second terminal 23, the signal may be transmitted in the opposite direction. That is, the signal can be transmitted from the second terminal 23 to the first terminal 21.

In addition, the operation of exchanging signals between the first terminal 21 and the second terminal 23 by unicasting may include performing a scrambling process by using resources or values known between the first terminal 21 and the second terminal 23, Control the information mapping process, data transmission process and unique identification (ID) value verification process. In addition, the first terminal 21 and the second terminal 23 may be mobile terminals, such as vehicles.

After that, it can be seen that the communication scheme between the third terminal to the fifth terminal 25, 27, and 29 is that the third terminal 25 communicates to other terminals in the group (such as the fourth terminal 27 and the fifth terminal 27 and the fifth terminal) through the side link. The terminal 29) transmits the group broadcast communication of the common data.

During the multicast communication, other terminals not included in the group (for example, the second terminal 23 and the seventh terminal 33) may not receive the signal transmitted by the third terminal 25 for the multicast.

For reference, the terminal configured to transmit signals for the group broadcast may not be the third terminal 25 but another terminal in the group (for example, the fourth terminal 27 or the fifth terminal 29). In addition, the allocation of resources for transmitting signals can be determined by the base station or the terminal serving as the leader of the group, or can be selected by the terminal configured to transmit signals. In addition, the third to fifth terminals 25, 27, and 29 may be mobile terminals, such as vehicles.

Finally, the communication between the sixth terminal to the eighth terminal 31, 33, and 35 will now be discussed. The communication scheme may include the seventh terminal 33 and the eighth terminal 35 receiving the common data from the sixth terminal 31 in the multicast communication and transmitting the feedback about the information related to the success or failure of the reception of the common data to the first Six terminal 31 communication. Although not shown in the figure, it is also possible to transmit feedback on information related to the success or failure of the data reception between the terminals in unicast communication (for example, the first terminal 21 and the second terminal 23).

For reference, the information related to the success or failure of the data reception may be hybrid automatic repeat request (HARQ)-acknowledgement/non-acknowledgement (ACK/NACK) information that may be included in the PSFCH. In addition, the sixth to eighth terminals 31, 33, and 35 may be mobile terminals, such as vehicles.

As described above, various terminals can be applied between a plurality of terminals (for example, the first terminal to the eighth terminal 21, 23, 25, 27, 29, 31, 33, and 35 configured to perform V2X communication according to the exemplary embodiment). Communication plan. In the following, Figure 2 will be explained based on the V2X communication scheme.

FIG. 2 is a diagram for explaining a process of transmitting a signal between a terminal and a base station and a process of transceiving a channel between the terminals according to an exemplary embodiment.

2, a wireless communication system 1000 according to an exemplary embodiment may include a base station 51 and a plurality of terminals (for example, terminals 53 and 55).

For reference, although Fig. 2 shows an example in which the wireless communication system 1000 only includes two terminals 53 and 55 and one base station 51 for the sake of brevity, the present disclosure is not limited to this. That is, the wireless communication system 1000 may include more or fewer terminals and base stations.

In addition, each of the terminals 53 and 55 shown in FIG. 2 may be capable of V2X communication, such as unicast, group broadcast, and PSFCH transmission as described with reference to FIG. 1. Therefore, although FIG. 2 shows unicast communication between two terminals 53 and 55, FIG. 2 can be interpreted as an example of group broadcast communication between some terminals in the group.

The wireless communication system 1000 may be referred to as a radio access technology (RAT). For example, the wireless communication system 1000 may be a wireless communication system using a cellular network, such as NR communication system, LTE communication system, advanced LTE (LTE-A) communication system, code division multiple access (CDMA) ) Communication system and global system for mobile communications (GSM). In an embodiment, the wireless communication system 1000 may be a wireless local area network (WLAN) communication system or another arbitrary wireless communication system.

The wireless communication network used in the wireless communication system 1000 can share available network resources and supports the communication of multiple wireless communication devices including the terminals 53 and 55.

For example, in a wireless communication network, various multiple access methods such as the following can be used to transmit information: CDMA, frequency division multiple access (FDMA), time division multiple access (TDMA) ), orthogonal FDMA (orthogonal FDMA, OFDMA), single-carrier FDMA (single-carrier FDMA, SC-FDMA), orthogonal frequency division multiplexing (OFDM)-FDMA, OFDM-TDMA and OFDM-CDMA .

In an embodiment, the wireless communication system 1000 may be an NR communication system. However, the exemplary embodiments are not limited to this, and can also be applied to the wireless communication systems of the previous and next generations.

In addition, base station 51 may refer to a fixed platform configured to communicate with terminals 53 and 55 and/or another base station. The base station 51 can communicate with the terminals 53 and 55 and/or another base station and exchange data and control information with the terminals 53 and 55 and/or another base station.

For example, the base station 51 may be referred to as Node B, evolved-Node B (eNB), next-generation Node B (gNB), sector, site, base transceiver system ( base transceiver system (BTS), access point (AP), relay node, remote radio head (RRH) or radio unit (RU).

In this embodiment, the base station 51 can be interpreted as a base station controller (BSC) of CDMA, a Node B of wideband CDMA (wideband CDMA, WCDMA), an eNB of LTE, a gNB of NR, or a fan Part of the area or function covered by a zone (site). The terminals 53 and 55 can be fixed devices as user devices or mobile devices as vehicles, and can refer to the ability to communicate with the base station 51 and transmit data and/or control information to the base station 51 and receive data from the base station 51 and / Or any device that controls information.

For example, the terminals 53 and 55 can be called wireless stations (STA), mobile stations (MS), mobile terminals (MT), user terminals (UT), and user terminals. Equipment (user equipment, UE), subscriber station (subscriber station, SS), wireless device, handheld device or vehicle.

In addition, the base station 51 can be connected to the terminals 53 and 55 through a wireless channel, and provide various communication services to the terminals 53 and 55 through the connected wireless channel. In addition, it is possible to serve all user traffic of the base station 51 by sharing a channel. In addition, the base station 51 can schedule the terminals 53 and 55 by collecting status information of the terminals 53 and 55 (such as PSFCH capabilities, buffer status, available transmission power status, and channel status).

In addition, the wireless communication system 1000 may use an Orthogonal Frequency Division Multiplexing (OFDM) scheme to support beamforming technology. In addition, the wireless communication system 1000 can support an adaptive modulation & coding (AMC) scheme, which determines the modulation scheme and the channel coding rate based on the channel status of the terminals 53 and 55.

For reference, the wireless communication system 1000 may use a frequency band including not only a frequency band of less than 6 gigahertz but also a frequency band of 6 gigahertz or more to transmit and receive signals.

For example, the wireless communication system 1000 can increase the data transmission rate by using the millimeter wave frequency band (for example, the 28 gigahertz frequency band or the 60 gigahertz frequency band).

The signal attenuation per distance can be relatively large in the millimeter wave band. Therefore, the wireless communication system 1000 can support the transceiving operation based on the directional beam to ensure the coverage. In addition, the wireless communication system 1000 may perform a beam scanning operation to be able to perform a transceiving operation based on a directional beam.

Here, the beam scanning operation may indicate that the terminals 53 and 55 and the base station 51 sequentially or randomly scan directional beams having a predetermined pattern to determine the transmit beams and receive beams whose orientation directions are aligned with each other. That is, the patterns of the transmit beam and the receive beam whose orientation directions are aligned with each other can be determined as a pair of beam patterns. In addition, the beam pattern may refer to a beam shape determined based on the width of the beam and the orientation direction of the beam.

Since the terminals 53 and 55 and the base station 51 of the wireless communication system 1000 can be configured and operated as described above, the communication between the terminals 53 and 55 or between the terminals 53 and 55 and the base station 51 will now be explained in more detail. .

The terminals 53 and 55 can transmit or receive signals SIG1, SIG2, SIG4, and SIG4 to and from the base station 51 via uplink or downlink, and access the network of the wireless communication system 1000. The link between the terminals 53 and 55 and the base station 51 (such as a data transceiver interface) may be referred to as a Uu link. In addition, in order to exchange various pieces of configuration information required for the signal transmission and reception operations between the terminals 53 and 55 and the base station 51, radio resource control (RRC) can be performed between the terminal 53 or 55 and the base station 51. connect. The RRC connection may be referred to as Uu-RRC.

Specifically, for example, the terminals 53 and 55 may transmit the signals SIG2 and SIG4 to the base station 51 for the maximum number of PSFCHs that can be transmitted and received during a time transmission interval (TTI) (for example, a time slot). In an embodiment, the maximum number of PSFCHs that can be transceived during one TTI may be referred to as a maximum PSFCH transceiving capability (maximum PSFCH transceiving capability or max PSFCH transceiving capability). In addition, the information about the maximum PSFCH transceiving capability may correspond to RRC information, which may be one of the user equipment (UE) capability information elements. Therefore, the terminals 53 and 55 can transmit the signals SIG2 and SIG4 to the base station 51 for the maximum PSFCH transceiving capability due to the RRC transmission. Therefore, information about the maximum PSFCH transceiving capability can be included in the physical uplink shared channel (PUSCH). In addition to being included in the PUSCH, information about the maximum PSFCH transceiving capability can also be included in the physical uplink control channel (PUCCH) or physical random access channel (PRACH), but The exemplary embodiment relates to an example in which information is included in the PUSCH.

For reference, in this embodiment, the content disclosed in Table 1 can be re-introduced and defined in conjunction with the maximum PSFCH transceiving capability of the terminal. Therefore, the terminals 53 and 55 can transmit to the base station 51 based on the items described in Table 1 for the maximum PSFCH transceiving capability.

[Table 1] (1) Introduce the UE capability information that the UE can receive [F] PSFCH in the time slot. (2) Introduce the UE's ability to transmit [R] PSFCH in the time slot. (3) F and R are for both groupcasting and unicasting.

For example, the "UE capability communication" of item (1) of Table 1 can be expressed as shown in Table 2 below.

[Table 2] NR_V2X_Max_PSFCHdecoding ::= ENUMERATED {n10, n20, n30, n40, n50, n100, n200, n300, nmax, spare}

For example, the "UE capability communication" of item (2) of Table 1 can be expressed as shown in Table 3 below.

[table 3] NR_V2X_Max_PSFCHtransmit ::= ENUMERATED {n1, n2, n3, n4, n5, n10, n20, n30, nmax, spare}

In addition, the contents disclosed in Table 1 can be arranged as shown in Table 4-1 and Table 4-2 below.

[Table 4-1] index Feature group component Prerequisite feature group gNB needs to know if the feature is supported Applicable to the capability communication exchange between UEs (only V2X work item (WI)). Results in the case where the UE does not support the feature 15-11 PSFCH format 0 1) UE can transmit and receive NR PSFCH format 0 2) UE can receive [N] PSFCH resources in a time slot. 3) The UE can transmit [M] PSFCH resources in the time slot. [4) The UE can report the sidelink HARQ-ACK to the gNB through PUCCH and PUSCH when it is operating in NR sidelink mode 1. ] [FFS: Move to 15-2] At least one of 15-1, 15-2, 15-3 FFS FFS

[Table 4-2] Type (the definition of "type" in UE characteristics should be based on the following nuances: 1) per UE or 2) per frequency band or 3) per BC or 4) per FS or 5) per FSPC) The need for differentiation of frequency division duplexing (FDD)/time division duplexing (TDD) The need for differentiation of frequency range 1 (FR1)/frequency range 2 (FR2) Capability explanation of FDD/TDD and/or FR1/FR2 mixed items Mark Mandatory/optional Per frequency band not applicable not applicable not applicable This is the basic FG of the side link. Note: In 38.101-1 table 5.2E-1 only in the frequency band indicated with the PC5 interface, it is not necessary to support the configuration performed by NR Uu. Note: in the frequency band indicated with the PC5 interface in 38.101-1 table 5.2E-1 No need to support component 4 FFS is optional for capability messaging: For UEs that support NR sidelinks, the UE must indicate that this FG is supported. ALT 1) The candidate value of N is {5, [10,] 15, [20,] 25, [30,] 35, [40,] 45, 50} ALT 2) The candidate value of N is {32, 64} The candidate values of M are {1, 4, [5,] 8, 16}

For reference, Table 4-1 and Table 4-2 are tables that divide a continuous table into due to limited space.

As described above, in an exemplary embodiment, the terminal 53 or 55 can transmit a signal to the base station 51 for the maximum PSFCH transceiving capability. An example of this situation will be explained in more detail with reference to FIG. 8. In addition, the base station 51 can perform RRC transmission to the terminals 53 and 55 based on the transmission from the terminals 53 and 55 (such as the signals SIG1 and SIG3), and it is the signal between the terminals 53 and 55 (such as PSSCH, physical side link control channel). The transmission and reception of (physical sidelink control channel, PSCCH) and PSFCH) perform scheduling operations or perform groupcasting-related setting operations (for example, select the group leader in the group and set the area size for groupcasting).

For reference, terminals 53 and 55 can receive scheduling information for side link communication based on RRC transmissions (such as signals SIG1 and SIG3) from base station 51, or receive physical downlink control channel (PDCCH) Information (such as downlink control information (DCI)).

In addition, the terminals 53 and 55 can transmit and receive signals between each other via side links, such as channel CH1, channel CH2, and channel CH3. The side link (such as the data transceiver interface) between the terminals 53 and 55 may be referred to as a PC5 link. In addition, in order to exchange various pieces of configuration information required for transmitting and receiving signals between the terminals 53 and 55, an RRC connection can be made between the terminals 53 and 55. The RRC connection can be referred to as PC5-RRC.

Herein, the frequency channels transmitted and received via the side link may include, for example, a side link control channel (such as a physical side link control channel (PSCCH)), a side link shared channel or a data channel (such as a physical side link shared channel (PSSCH) )), the sidelink broadcast channel (such as the physical sidelink broadcast channel (PSBCH)) and the feedback transmission channel (such as the physical sidelink feedback channel (PSFCH)) that use synchronous signal broadcasting.

In an embodiment, the terminal 53 configured to perform a data transmission operation in the side link may be referred to as a transmitting terminal, and the terminal 55 configured to perform a data receiving operation in the side link may be referred to as a receiving terminal. Both the transmitting terminal and the receiving terminal can perform data transmitting operations and data receiving operations in the side link, respectively.

The transmitting terminal 53 may generate sidelink scheduling information based on the scheduling information provided by the base station 51, such as sidelink control information (SCI). In addition, the transmitting terminal 53 can transmit to the receiving terminal 55 the PSCCH CH1 including the generated side link scheduling information.

Here, the side link scheduling information may be transmitted to the receiving terminal 55 as a single SCI, or may be divided into two SCIs and transmitted to the receiving terminal 55. For reference, the method in which the side link scheduling information is divided into two SCIs and transmitted to the receiving terminal 55 can be referred to as 2-phase SCI or 2-phase PSCCH.

The transmitting terminal 53 can transmit the PSSCH CH2 as a data channel to the receiving terminal 55 based on the side link scheduling information. In addition, the receiving terminal 55 may transmit a feedback, namely PSFCH CH3, to the transmitting terminal 53, the feedback including information related to the success or failure of the reception of the PSSCH CH2 transmitted by the transmitting terminal 53, such as HARQ-ACK/NACK. Therefore, the transmitting terminal 53 can determine whether the PSFCH CH3 received from the receiving terminal 55 includes HARQ ACK or HARQ NACK, and determine whether to retransmit PSSCH CH2 based on the determination result.

As described above, various signals or channels can be transmitted and received between the terminals 53 and 55 and the base station 51, as described in more detail below.

The wireless communication system 1000 according to the exemplary embodiment has the characteristics and configuration as described above. Therefore, the structure of the time-frequency range applied to the side link of the NR communication system according to an exemplary embodiment will now be explained with reference to FIGS. 3 to 5.

For reference, the structure of the time-frequency range shown in FIGS. 3 to 5 may be an example of the time-frequency range applicable to this embodiment, and therefore, the present disclosure is not limited to this. However, for the sake of brevity, the structure of the time-frequency range shown in FIGS. 3 to 5 will be explained as an example.

First, referring to FIG. 3, the abscissa indicates the time zone, and the ordinate indicates the frequency range. The smallest transmission unit in the time domain may be an OFDM symbol, and N _symb OFDM symbols may form a time slot. The length of the subframe can be 1.0 millisecond (ms), and the length of the radio frame can be 10 milliseconds. The smallest transmission unit in the frequency range may be a subcarrier, and the system transmission bandwidth may include a total of N _BW subcarriers.

In the time-frequency range, the basic unit of the resource may be a resource element (resource element, RE) that can be expressed by an OFDM symbol index and a subcarrier index. A resource block (RB) or a physical resource block (PRB) can be defined by N _symb consecutive OFDM symbols in the time domain and N _RB consecutive subcarriers in the frequency domain. Therefore, one RB may include N _symb × N _RB REs.

For reference, the smallest transmission unit of data may usually be an RB unit. In the NR communication system, usually, N _symb may be at least one, N _RB may be equal to 12, and N _BW and N _RB may be proportional to the system transmission bandwidth. In addition, the data rate can be increased in proportion to the number of RBs scheduled for the terminal.

In addition, the channel bandwidth may indicate the RF bandwidth corresponding to the system transmission bandwidth. For example, in an NR communication system with a subcarrier width of 30 kilohertz (kHz) and a channel bandwidth of 100 megahertz (MHz), the transmission bandwidth may include 273 RBs.

4 and 5, based on the above description, the sub-channels and resource pools defined in the 16th version (Rel-16) NR V2X communication to improve the efficiency of resource use are shown. For reference, FIG. 4 shows the basic frame structure of NR V2X communication and 2-stage PSCCH, such as the time-frequency domain structure. In addition, the resource pool is shown in FIG. 5.

Specifically, in NR V2X communication, one time slot may include at least one resource pool, and each of the at least one resource pool may include multiple sub-channels. Here, the size of the sub-channel may be any of 10 RBs, 15 RBs, 20 RBs, 25 RBs, 50 RBs, 75 RBs, and 100 RBs, for example. However, depending on the situation, the size of the sub-channel may be any of 4 RBs, 5 RBs, and 6 RBs. As an example, FIG. 4 shows that sub-channel #1 and sub-channel #2 are included and each of sub-channel #1 and sub-channel #2 includes 15 RBs (shown as RB #0 to sub-channel #1) Examples of RB #14 of sub channel #1 and RB #0 of sub channel #2 to RB #14 of sub channel #2).

In addition, the 0th symbol (symbol 0) of the time slot can be a symbol used for automatic gain control (AGC) training.

In addition, the twelfth symbol (symbol 12) of the time slot can be allocated and transmitted to determine whether the PSFCH is normally received. The transmission timing may be in two or three time slots after the time slot in which the PSSCH is transmitted. For example, when PSSCH is transmitted in time slot A, the PSFCH corresponding to the PSSCH can be transmitted as a feedback in time slot A+2 or time slot A+3.

個PSFCH。For reference, the PSFCH may include 1 PRB (or 1 RB) and be transmitted in each sub-channel. In addition, the transmission and reception period of each PSFCH can be set, and the minimum value of the transmission and reception period can be set to 1, for example, 1 time slot unit. Since multiple PSFCHs can use the same resource, up to six cyclic shifts can be applied to different PSFCHs transmitted in the same RB. Therefore, up to

PSFCH.

The AGC for receiving the PSFCH may be allocated in the symbol (for example, symbol 11) immediately before the PSFCH. Since the transmitting body (for example, transmitting terminal) of the 0th to 9th symbols (symbols 0 to 9) is different from the transmitting terminal of the eleventh and twelfth symbols (symbols 11 and 12) (for example, Receiving terminal), so AGC for PSFCH may be separately required.

In addition, guard symbols can be assigned to the tenth symbol and the thirteenth symbol (symbols 10 and 13) to ensure the protection time for timing advance. The transmitting body of the 0th to 9th symbols (symbols 0 to 9) is different from the transmitting terminal of the eleventh and twelfth symbols (symbols 11 and 12), so the receiver may make the symbols The code timing is not aligned, and therefore, a guard code may be required.

A demodulation reference signal (DMRS), PSCCH, and PSSCH can be allocated to the first to ninth symbols (symbols 1 to 9) except for the aforementioned channels and symbols. In addition, PSFCH, AGC, and guard codes can be assigned to the first to ninth symbols (symbols 1 to 9). However, for the sake of brevity, the exemplary embodiment is about an example in which PSFCH, AGC, and guard codes are allocated to the tenth to thirteenth symbols.

For reference, in NR V2X communication, since the PSCCH is transmitted in two stages, the first PSCCH can be allocated to the PSCCH scheduling range first, and the second PSCCH can be allocated to the PSSCH range.

More specifically, the first PSCCH may exist in the lowest RB of the sub-channel (for example, RB #0 of the sub-channel #0) and include the first SCI. In addition, the first SCI may include PSSCH allocation information (for example, frequency domain resource allocation (FDRA) and time domain resource allocation (TDRA)) and the second PSCCH allocation information. The second PSCCH may include the second SCI and is first allocated to the lowest RE that excludes the REs of the DMRS in the first DMRS symbol (for example, the DMRS of symbol 0), such as SC #1, where SC refers to the subcarrier. In addition, the second SCI may include information required to decode the PSSCH.

As described above, the time-frequency range applied to the side link of the NR communication system can be configured according to this embodiment. Hereinafter, the configuration of a radio frequency (RF) transceiver of a terminal or a base station according to an exemplary embodiment will be explained with reference to FIGS. 6 and 7.

Fig. 6 is a block diagram of an RF transceiver component included in a terminal or a base station according to an exemplary embodiment. Fig. 7 is a simplified block diagram of the RF transceiver assembly shown in Fig. 6 according to an embodiment.

For reference, the RF transceiver components shown in FIGS. 6 and 7 may be included in the terminal 53 or 55 or the base station 51 shown in FIG. 2. In addition, the RF transceiver components shown in FIGS. 6 and 7 may include components in the transmission path and components in the reception path.

Hereinafter, for the sake of brevity, an example in which the RF transceiver components shown in FIGS. 6 and 7 are included in the terminal 53 shown in FIG. 2 will be explained. In addition, the baseband circuit 120 shown in FIG. 6 will be explained by focusing on the components in the receiving path.

First, referring to FIG. 6, a terminal (for example, the terminal 53) may include an antenna 90, a front-end module (FEM) 105, an RF integrated circuit (RFIC) 110 and a baseband circuit 120.

The antenna 90 can be connected to the FEM 105 and transmit a signal provided by the FEM 105 to another wireless communication device (such as a terminal or a base station), or provide a signal received from another wireless communication device to the FEM 105. In addition, the FEM 105 can be connected to the antenna 90 and separate the transmission frequency from the reception frequency. That is, the FEM 105 can separate the signal provided by the RFIC 110 for each frequency band and provide the separated signal to the antenna 90 corresponding to it. In addition, the FEM 105 can provide the signal provided by the antenna 90 to the RFIC 110.

As described above, the antenna 90 can transmit a signal whose frequency is separated to the outside (for example, the outside of the terminal (such as the terminal 53)), or provide a signal received from the outside to the FEM 105.

For reference, the antenna 90 may include, for example, an array antenna, but it is not limited to this. In addition, the antenna 90 may be provided in a singular or plural number. Therefore, in some embodiments, the terminal 53 may use multiple antennas to support phased arrays and multiple input multiple output (MIMO). However, for the sake of brevity, one antenna 90 is shown in FIG. 6.

The FEM 105 may include an antenna tuner. The antenna tuner can be connected to the antenna 90 and adjust the impedance of the antenna 90.

The RFIC 110 can perform up-conversion on the baseband signal received from the baseband circuit 120 and generate an RF signal. In addition, the RFIC 110 can perform down-conversion on the RF signal received from the FEM 105 and generate a baseband signal.

Specifically, the RFIC 110 may include a transmitting circuit 112 for up-conversion operation, a receiving circuit 114 for down-conversion operation, and a local oscillator 116.

For reference, the transmitting circuit 112 may include a first analog baseband filter, a first mixer, and a power amplifier. In addition, the receiving circuit 114 may include a second analog baseband filter, a second mixer, and a low noise amplifier.

Here, the first analog baseband filter can filter the baseband signal received from the baseband circuit 120 and provide the filtered baseband signal to the first mixer. In addition, the first mixer can perform an up-conversion of converting the frequency of the base frequency signal from the base frequency to the high frequency band according to the frequency of the signal provided by the local oscillator 116. Due to up-conversion, the baseband signal can be provided as an RF signal to the power amplifier, and the power amplifier can amplify the power of the RF signal and provide the amplified RF signal to the FEM 105.

The low noise amplifier can amplify the RF signal provided by the FEM 105 and provide the amplified RF signal to the second mixer. The second mixer can perform down-conversion of converting the frequency of the RF signal from the high frequency band to the fundamental frequency according to the frequency of the signal provided by the local oscillator 116. Due to the down-conversion, the RF signal can be provided as a baseband signal to the second analog baseband filter, and the second analog baseband filter can filter the baseband signal and provide the filtered baseband signal to the baseband circuit 120.

In addition, the baseband circuit 120 can receive the baseband signal from the RFIC 110 and process the baseband signal, or generate the baseband signal and provide the baseband signal to the RFIC 110.

In addition, the baseband circuit 120 may include a controller 122, a storage 124, and a signal processing unit 125.

Specifically, the controller 122 may not only control the overall operation of the base frequency circuit 120, but also control the overall operation of the RFIC 110. In addition, the controller 122 can write data to the storage 124 or read data from the storage 124. To this end, the controller 122 may include at least one processor, at least one microprocessor, or at least one microcontroller, or be a part of the processor. More specifically, the controller 122 may include, for example, a central processing unit (CPU) and a digital signal processor (DSP).

The storage 124 can store basic programs, application programs, and data (such as setting information) used for the operation of the terminal 53. For example, the storage 124 may store commands and/or data associated with the controller 122, the signal processing unit 125, or the RFIC 110.

In addition, the storage 124 may include various storage media. That is, the storage 124 may include volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. For example, the storage 124 may include random access memory (RAM) (such as dynamic RAM (DRAM, DRAM), phase-change RAM (PRAM), magnetic RAM (magnetic RAM, MRAM), and static RAM ( static RAM, SRAM) and flash memory (such as NAND flash memory, NOR flash memory and SLR and (OneNAND) flash memory).

In addition, the storage 124 may store various processor-executable instructions. The processor-executable instructions can be executed by the controller 122.

The signal processing unit 125 can process the baseband signal received from the RFIC 110.

Specifically, the signal processing unit 125 may include a demodulator 126, a receiving filter and cell searcher (RxFilter & cell searcher) 128, and other components 130.

First, the demodulator 126 may include a channel estimator, a data de-allocation unit, an interference whitener, a symbol detector, a channel state information (CSI) generator, a mobility measurement unit, and an automatic gain control unit , Automatic frequency control unit, symbol timing recovery unit, delay spread estimation unit and time correlator, and perform the functions of each of the above components.

Here, the mobility measurement unit may be a unit configured to measure the signal quality of the serving cell and/or neighboring cells to support mobility. The mobile measurement unit can measure the received signal strength indicator (RSSI) of the cell, the reference signal received power (RSRP), the reference signal received quality (RSRQ), and the reference signal (reference signal). , RS)-signal to interference and noise ratio (SINR).

For reference, although not shown in the figure, the demodulator 126 may include a second-generation (2nd generation, 2G) communication system, a third-generation (3rd generation, 3G) communication system, and a fourth-generation (2nd generation, 2G) communication system. Multiple sub-demodulators that independently or jointly perform the above operations in 4G) communication systems and 5G (5G) communication systems that separately de-spread signals or signals with corresponding frequency bands.

Thereafter, the receiving filter and cell searcher 128 may include a receiving filter, a cell searcher, a fast Fourier transform (FFT) unit, and a time duplex-automatic frequency control (time duplex-automatic frequency control, TD-AGC) unit. ) Unit and time duplex-automatic frequency control (time duplex-automatic frequency control, TD-AFC) unit.

Herein, the receiving filter of the front end of the receiver (Rx) can also be referred to as the receiver filter, which can perform sampling, interference cancellation, and amplification of the fundamental frequency signal received from the RFIC 110. In addition, the cell detector may include a primary synchronization signal (PSS) detector and a secondary synchronization signal (SSS) detector and measure the magnitude and quality of signals from neighboring cells.

In addition, other components 130 may include a symbol processor, a channel decoder, and an uplink processor.

Here, the symbol processor can perform channel deinterleaving, demultiplexing, and rate matching for each channel to decode the demodulated signal. In addition, the channel decoder can decode the demodulated signal in units of code blocks.

For reference, the symbol processor and channel decoder may include a hybrid automatic repeat request (HARQ) processing unit, turbo decoder, cyclic redundancy check (CRC) checker, Viterbi decoder and turbo Encoder.

As an uplink processor configured to generate a transmission baseband signal processor, it may include a signal generator, a signal distributor, an inverse fast Fourier transform (IFFT) unit, and a discrete Fourier transform (DFT). ) Unit and transmitter (transmitter, Tx) front end.

In this article, the signal generator can generate PUSCH, PUCCH and PRACH. In addition, the Tx front-end can perform operations such as interference cancellation and digital mixing on the transmission baseband signal.

For reference, the other components 130 may further include a side link processor. The side link processor can generate the physical side link shared channel (PSSCH), the physical side link control channel (PSCCH), and the physical side link feedback channel (PSFCH). In another case, the side link processor may not be provided separately, but integrated with the uplink processor into one processor. However, for the sake of brevity, the exemplary embodiment is about an example in which the side link processor is separately provided with respect to the uplink processor.

The signal processing unit 125 may have the configuration and characteristics described above. However, the respective configurations or functions of the demodulator 126, the receiving filter and the cell searcher 128, and other components 130 in the signal processing unit 125 can be changed. For example, the channel estimator in the demodulator 126 may be included in the receiving filter and cell searcher 128 or other components 130, and the FFT unit in the receiving filter and cell searcher 128 may be included in the demodulator 126 or other components. Component 130. In addition, the channel decoder in other components 130 may be included in the demodulator 126 or the receiving filter and cell searcher 128. However, for the sake of brevity, the exemplary embodiment refers to an example in which the respective configurations or functions of the demodulator 126, the receiving filter and the cell searcher 128, and the other components 130 in the signal processing unit 125 are implemented as described above.

As described above, FIG. 6 shows a situation where the baseband circuit 120 includes the controller 122, the storage 124, and the signal processing unit 125.

However, at least two of the controller 122, the storage 124, and the signal processing unit 125 can be integrated into one component in the baseband circuit 120. In addition, the baseband circuit 120 may further include additional components in addition to the above-mentioned components, or may not include some components. In addition, the signal processing unit 125 may further include additional components in addition to the above-mentioned components, or may not include some components.

However, for the sake of brevity, the exemplary embodiment is about an example in which the baseband circuit 120 includes the above-mentioned components.

In addition, in some embodiments, the controller 122, the storage 124, and the signal processing unit 125 may be included in one device. In other embodiments, the controller 122, the storage 124, and the signal processing unit 125 may be distributed and included in different devices, for example, in a distributed architecture.

The RF transceiver assembly shown in FIG. 6 having the above-mentioned configuration may be included in one or more of the terminal 53 or 55 or the base station 51 shown in FIG. 2, for example.

The RFIC 110 and the baseband circuit 120 may include components known to those with ordinary knowledge as shown in FIG. 6. In addition, the components can be executed in a conventional manner by using hardware, firmware, software logic, or a combination thereof.

However, FIG. 6 only shows an example of the RF transceiver component, and the embodiment is not limited to this. That is, various changes can be made in FIG. 6, such as addition or deletion of components.

FIG. 7 shows an example in which the configuration of the RF transceiver assembly shown in FIG. 6 is partially changed (for example, simplified).

Specifically, the terminal 53 may include a processor 150, a transceiver 160, a memory 170, and an antenna 180.

The processor 150 can control the overall operation of the transceiver 160 and write data to the memory 170 or read data from the memory 170. That is, the processor 150 may be, for example, a component including the functions of the controller 122 shown in FIG. 6.

The transceiver 160 can transmit and receive wireless signals and is controlled by the processor 150. That is, the transceiver 160 may be, for example, a component including the functions of the FEM 105, the RFIC 110, and the signal processing unit 125 shown in FIG. 6.

The memory 170 may include basic programs, application programs, and data (such as setting information) used for the operation of the terminal 53. Therefore, the memory 170 can store instructions and/or data associated with the processor 150 and the transceiver 160. That is, the memory 170 may be, for example, a component including the function of the storage 124 shown in FIG. 6.

The antenna 180 can be connected to the transceiver 160 and transmit a signal provided by the transceiver 160 to another wireless communication device (such as a terminal or a base station) or provide a signal received from another wireless communication device to the transceiver 160. That is, the antenna 180 may be, for example, a component including the function of the wire 90 shown in FIG. 6.

Since the terminal 53 or 55 or the base station 51 has the characteristics and configuration described above in the exemplary embodiment, the transmission between the terminal 53 or 55 and the base station 51 will now be described in detail with reference to FIG. 8 to enable V2X communication. Instance of the process.

FIG. 8 is a flowchart of a message process performed between the terminal 53 or 55 shown in FIG. 2 and the base station 51 according to an embodiment.

For reference, FIG. 8 will be explained with reference to FIG. 2 and FIG. 7.

Referring to FIG. 8, in order to be able to perform efficient PSFCH receiving and sending operations in V2X communication, the terminal 53 (which may be a transmitting terminal, for example) and the base station 51 can transmit messages to each other.

First, in operation S100, in order to enable efficient PSFCH transceiving operations, the terminal 53 may inform the base station 51 of the maximum number of PSFCHs that can be received during one TTI. In an embodiment, the maximum number of PSFCHs that can be received during one TTI may be referred to as maximum PSFCH receiving capability F (maximum PSFCH receiving capability F or max PSFCH receiving capability F).

Specifically, the processor 150 can control the transceiver 160 to transmit the maximum PSFCH receiving capability F to the base station 51.

Here, the TTI may include a time slot, and the maximum PSFCH receiving capability F may include the number of PSFCHs received in at least one of groupcast and unicast. That is, the maximum PSFCH reception capability F may include the total number of PSFCHs received in each of groupcast and unicast, or only the number of PSFCHs received in groupcast or unicast. Therefore, the maximum PSFCH receiving capability F may be any one of 10, 20, 30, 40, 50, 100, 200, 300, and 410, for example.

。In operation S150, when the base station 51 receives a signal about the maximum PSFCH receiving capability F from the terminal 53, the base station 51 may set the side link communication of the terminal 53 to satisfy the following inequality:

.

For reference, F may refer to the maximum number of PSFCHs that can be received during one time slot, and L may refer to the number of PSSCHs transmitted in the multicast during each time slot. In addition, M may refer to the number of receiving terminals included in the same group as the transmitting terminal (for example, a terminal group used for groupcasting), and N may refer to the PSFCH receiving period.

That is, to enable efficient PSFCH transmission and reception operations, the base station 51 may consider the maximum PSFCH receiving capability F to determine the values L, M, and N associated with the terminal 53. In addition, the base station 51 may further consider the following methods in the multicast mode to satisfy the inequality presented above.

時，基地台51可確定其中自與發射終端相同的群組中所包括的接收終端中各自與NACK對應的接收終端接收到僅一個共同PSFCH的「基於NACK的HARQ」是HARQ方案。在此種情形中，值M可為1。1) When combined with the receiving terminals included in the group, the inequality is satisfied

At this time, the base station 51 may determine that “NACK-based HARQ” in which only one common PSFCH is received from the receiving terminals each corresponding to the NACK among the receiving terminals included in the same group as the transmitting terminal is the HARQ scheme. In this case, the value M may be 1.

時，基地台51可確定其中發射終端自與發射終端相同的群組中所包括的所有接收終端中的每一者接收到PSFCH的「基於ACK/NACK的HARQ」作為HARQ方案。2) When combined with the receiving terminals included in the group, the inequality is satisfied

At this time, the base station 51 may determine “ACK/NACK-based HARQ” in which the transmitting terminal receives the PSFCH from each of all receiving terminals included in the same group as the transmitting terminal as the HARQ scheme.

，基地台51可確定區的大小，即，由基地台51設定以能夠進行群播的區域的範圍。例如，當群組中所包括的終端具有高值F時，基地台51可將區設定成較大的大小；而當群組中所包括的終端具有低值F時，基地台51可將區設定成較小的大小。作為參考，可基於區的大小來確定群組中所包括的終端的數目。3) To satisfy the inequality

The base station 51 can determine the size of the area, that is, the range of the area set by the base station 51 to enable group broadcasting. For example, when the terminals included in the group have a high value F, the base station 51 may set the area to a larger size; and when the terminals included in the group have a low value F, the base station 51 may set the area Set to a smaller size. For reference, the number of terminals included in the group may be determined based on the size of the zone.

的終端作為組長。當多個終端滿足以上條件時，基地台51可選擇具有最佳頻道狀態的終端作為組長。4) When the group leader configured to perform group broadcasting is determined among the terminals included in the group, the optional value F of the base station 51 satisfies the inequality

The terminal as the group leader. When multiple terminals meet the above conditions, the base station 51 can select the terminal with the best channel status as the group leader.

In addition, in operation S200, in order to enable efficient PSFCH transceiving operations, the terminal 53 may inform the base station 51 of the maximum number of PSFCHs that can be transmitted during one TTI. In an embodiment, the maximum number of PSFCHs that can be transmitted during one TTI may be referred to as maximum PSFCH transmission capability R (maximum PSFCH transmission capability R or max PSFCH transmission capability R).

Specifically, the processor 150 can control the transceiver 160 to transmit the maximum PSFCH transmission capability R to the base station 51.

Here, the TTI may include a time slot, and the maximum PSFCH transmission capability R may include the number of PSFCHs transmitted in at least one of groupcast and unicast. That is, the maximum PSFCH transmission capability R may include the total number of PSFCHs transmitted in each of groupcast and unicast, or only include the number of PSFCHs transmitted in groupcast or unicast. Therefore, the maximum PSFCH transmission capability R may be any one of 1, 2, 3, 4, 5, 10, 20, 30, and 68, for example.

For reference, operation S200 may be performed before operation S100, or operations S100 and S200 may be performed at the same time. In addition, the terminal 53 may perform only one of operations S100 and S200, and according to the operation performed by the terminal 53, the base station 51 may perform only a specific operation S150 or S250, or only perform a part of the operation S150 or S250. However, for the sake of brevity, the exemplary embodiment is about an example in which operation S200 is performed after operation S100 and terminal 53 performs both operations S100 and S200.

When the base station 51 receives the transmission information about the maximum PSFCH transmission capability R from the terminal 53, at operation S250, the base station 51 can set the side link communication of the terminal 53 to satisfy the following inequality:

For reference, U may refer to the number of PSSCH received in unicast during one time slot, and G may refer to the number of PSSCH received in multicast during one time slot. In addition, R may refer to the maximum number of PSFCHs that can be transmitted during one time slot.

藉由考量最大PSFCH發射能力R來判斷終端53可屬於的單播及/或群播。此外，為滿足以上不等式，基地台51可將單播及群播排定優先級，並根據較高優先級的次序來確定R個接收頻道（例如可在單播及群播中接收的R個接收頻道）作為終端53的接收頻道。That is, in order to be able to perform efficient PSFCH transmission and reception operations, the base station 51 can be based on the inequality

The unicast and/or groupcast to which the terminal 53 can belong is determined by considering the maximum PSFCH transmission capability R. In addition, in order to satisfy the above inequality, the base station 51 may prioritize unicast and group broadcasting, and determine R receiving channels according to the order of higher priority (for example, R receiving channels that can be received in unicast and group broadcasting). The receiving channel) is used as the receiving channel of the terminal 53.

As described above, due to the above process, at operation S300, the base station 51 may perform RRC messaging to the terminal 53 based on the messaging received from the terminal 53. Therefore, the base station 51 can perform a scheduling operation for the side link communication of the terminal 53 or perform a group broadcasting related setting operation (for example, selecting a leader in a group and setting the size of the area for the group broadcasting).

As described above, the terminal 53 and the base station 51 can transmit messages to each other to enable efficient PSFCH transmission and reception operations in V2X communication. Hereinafter, according to the PSFCH judgment method of the terminal in the V2X communication according to an exemplary embodiment, an example of this method will be explained with reference to FIG. 9 and FIG. 10.

Fig. 9 is a flowchart of a PSFCH judgment method of a terminal according to an exemplary embodiment. FIG. 10 is a detailed flowchart of operations S1200 and S1300 shown in FIG. 9 according to an exemplary embodiment.

For reference, FIGS. 9 and 10 will be explained with reference to FIGS. 2 and 7.

9, first, at operation S1000, k PSFCHs (where k is an integer greater than 1) can be selected from all PSFCHs received during one TTI, and the RSRP or SINR of the selected k PSFCHs can be measured.

Specifically, the processor 150 may select k PSFCHs from all PSFCHs based on a preset specific criterion or randomly. In addition, the processor 150 may control the transceiver 160 to sequentially measure the RSRP or SINR of k PSFCHs (where k is an integer greater than 1) among all PSFCHs received during a TTI.

For reference, the processor 150 may control the transceiver 160 to sequentially measure the RSRP or SINR of the k PSFCHs after selecting all the k PSFCHs. In an embodiment, whenever a PSFCH is selected, the processor 150 may control the transceiver 160 to immediately measure the RSRP or SINR of the selected PSFCH.

Here, k can be preset by the manufacturer or user of the terminal 53 based on at least one of the channel status of the terminal 53, the performance of the terminal 53, and the total number of PSFCHs. In addition, for example, when a base station (for example, the base station 51 in FIG. 8) sets a side link, the terminal 53 may be instructed to set k to any value within a specific range.

When the RSRP or SINR of the selected k PSFCHs are sequentially measured, at operation S1100, the k PSFCHs may be sorted in ascending powers based on the measured RSRP or SINR.

Specifically, the processor 150 may rank the k PSFCHs in ascending powers based on the RSRP or SINR of the k PSFCHs measured by the transceiver 160. When the sorting of the k PSFCHs in ascending power is completed, at operation S1200, it may be determined in ascending order whether the sorted k PSFCHs are HARQ ACK or HARQ NACK, and at operation S1300, it may be determined whether or not based on the determination result. PSSCH will be retransmitted.

Specifically, the processor 150 may control the transceiver 160 to sequentially determine whether the sorted k PSFCHs are HARQ ACK or HARQ NACK in ascending order. In addition, the processor 150 may determine whether the PSSCH will be retransmitted based on the determination result.

For reference, the HARQ ACK/NACK determination operation may be performed by the channel decoder of the transceiver 160 (for example, the channel decoder included in the other components 130 shown in FIG. 6).

FIG. 10 specifically illustrates an example of operations S1200 and S1300 according to the embodiment.

Specifically, referring to FIG. 10, operation S1200 may start with operation S1210 as follows: judging whether the m-th PSFCH (where 1≦m (integer)≦k) among the k PSFCHs sorted is HARQ ACK or HARQ NACK.

Therefore, if it is determined at operation S1220 that the m-th PSFCH (where 1≦m (integer)≦k) among the k PSFCHs sorted is HARQ ACK, it may be determined whether m is less than k at operation S1320. Based on the judgment result of operation S1320, the HARQ ACK/NACK judgment operation (return to operation S1210) may be continued on the m+1th PSFCH to the kth PSFCH among the k PSFCHs sorted, or the sorting k PSFCH may be ended. The PSFCH performs the HARQ ACK/NACK judgment operation (continue to operations S1330 to S1350).

For example, when m is less than k, for example, when there is at least one PSFCH that has not been subjected to the HARQ ACK/NACK determination operation among the k PSFCHs that are sorted, the m+1th PSFCH to the kth PSFCH may be sequentially adjusted at operation S1210. Perform HARQ ACK/NACK judgment operation.

Otherwise, when m is equal to k, for example, when the HARQ ACK/NACK judgment operation is completely performed on the k PSFCHs sorted, the HARQ ACK/NACK judgment operation on the k PSFCHs sorted can end, and by continuing to In operations S1330 to S1350, depending on whether there is at least one PSFCH for which the HARQ ACK/NACK determination operation has not been performed in all PSFCHs, it may be determined whether the operation of measuring the RSRP or SINR of the next k PSFCHs will be continued.

Specifically, at operation S1330, when there is at least one PSFCH for which the HARQ ACK/NACK determination operation has not been performed in all PSFCHs, the operation of measuring the RSRP or SINR of the next k PSFCHs may be continued at operation S1340. In this case, the above-mentioned operations S1100 to S1300 may be sequentially performed on the next k PSFCHs. Otherwise, at operation S1330, when there is no PSFCH for which the HARQ ACK/NACK determination operation has not been performed in all PSFCHs, the HARQ ACK/NACK determination operation on all PSFCHs may end at operation S1350.

In addition, at operation S1220, when it is determined that the m-th (where 1 ≤ m (integer) ≤ k) PSFCH among the k PSFCHs that are sorted is HARQ NACK, the pairing of the k PSFCHs that are sorted may be interrupted at operation S1310. Perform HARQ ACK/NACK judging operation on the m+1th PSFCH to the kth PSFCH and determine that the PSSCH will be retransmitted.

For reference, if it is determined that the PSSCH will be retransmitted, all PSSCHs may be retransmitted, for example, all PSSCHs corresponding to all PSFCHs. In addition, the above operations S1210 to S1350 may be performed by the processor 150 and the transceiver 160.

Specifically, in the PSFCH judgment method of the terminal 53, according to an exemplary embodiment, after measuring the RSRP or SINR of the selected k PSFCHs (refer to operation S1000), it may not be performed again to select a new k from the remaining PSFCHs. PSFCHs, but the subsequent processing operations (for example, ACK/NACK determination operation) may be performed on the k PSFCHs selected in operation S1000 before the new k PSFCHs are selected. Therefore, the complexity of the ACK/NACK judging operation can be reduced compared with the case where all PSFCHs are judged as ACK or NACK at one time, and the processing time and memory required for the ACK/NACK judging operation can be reduced. In addition, since the PSFCH with low RSRP or SINR among the selected k PSFCHs is first determined as ACK or NACK, NACK can be quickly determined.

As described above, the PSFCH judgment method of the terminal according to the exemplary embodiment may be performed. Hereinafter, an example of a PSFCH judgment method of a terminal according to another exemplary embodiment will be explained with reference to FIG. 11 and FIG. 12.

Fig. 11 is a flowchart of a PSFCH judgment method of a terminal according to an exemplary embodiment. FIG. 12 is a detailed flowchart of operation S2000 shown in FIG. 11.

For reference, FIGS. 11 and 12 will be explained with reference to FIGS. 2 and 7.

Referring to FIG. 11, first, at operation S2000, RSRP or SINR of all PSFCHs received during one TTI may be measured, and k PSFCHs satisfying a preset criterion may be selected from PSFCHs whose RSRP or SINR is measured. Here, k may be an integer greater than 1.

Specifically, the processor 150 may control the transceiver 160 to sequentially measure the RSRP or SINR of all PSFCHs received during a TTI. When the PSFCH that meets the preset criterion among the PSFCHs whose RSRP or SINR is measured reaches k, the selection operation may end, for example, operation S2000.

FIG. 12 specifically shows an example of operation S2000.

Specifically, referring to FIG. 12, operation S2000 may start with operation S2010 as follows: measure the RSRP or SINR of the nth PSFCH (where n is a positive integer smaller than the total number of PSFCHs).

Therefore, in operation S2010, when the RSRP or SINR of the nth PSFCH is measured (where n is a positive integer smaller than the total number of PSFCHs), it may be judged whether the nth PSFCH meets the preset criterion in operation S2020.

If it is determined that the n-th PSFCH satisfies the preset criterion, then at operation S2030, the cumulative count of PSFCHs satisfying the preset criterion may be incremented by one. At operation S2040, when the cumulative count incremented by 1 (for example, the number of PSFCHs satisfying a preset criterion) is equal to k, operation S2100 shown in FIG. 11 may be performed. When the cumulative count incremented by 1 (for example, the number of PSFCHs meeting a preset criterion) is less than k, an operation S2010 of measuring the RSRP or SINR of the next PSFCH (for example, the n+1th PSFCH) may be performed.

Even when it is determined that the nth PSFCH does not meet the preset criterion, the operation S2010 of measuring the RSRP or SINR of the next PSFCH (for example, the n+1th PSFCH) may be performed.

For reference, there may be various criteria, and the method of selecting k PSFCHs based on each criterion may be as follows.

1) When all the k PSFCHs whose RSRP or SINR is less than the preset reference value are accumulated, the selection operation can be ended. Specifically, the HARQ ACK/NACK determination operation may be performed on the PSFCH whose RSRP or SINR is less than the preset reference value, but the HARQ ACK/NACK determination operation may not be performed on the PSFCH whose RSRP or SINR is greater than or equal to the preset reference value. The result of the judgment operation on some PSFCHs can be regarded as representing the judgment operation on all PSFCHs. According to this method, the data rate can be improved by using the following fact: in the case where the receiving terminal has a better channel status than a certain threshold, the PSFCH feedback is unlikely to be NACK.

2) When k PSFCHs with RSRP or SINR greater than the preset reference value in all PSFCHs are accumulated, the selection operation can be ended. Specifically, the HARQ ACK/NACK determination operation may be performed on the PSFCH whose RSRP or SINR is greater than the preset reference value, but the HARQ ACK/NACK determination operation may not be performed on the PSFCH whose RSRP or SINR is less than or equal to the preset reference value. The result of the judgment operation on some PSFCHs can be regarded as representing the judgment operation on all PSFCHs. According to this method, the data rate can be improved by taking advantage of the fact that in the case where the receiving terminal has a channel status worse than a certain threshold, the PSFCH feedback is likely to be NACK.

3) When all the k PSFCHs whose RSRP or SINR is greater than the first reference value and less than the second reference value in all PSFCHs are accumulated, the selection operation can be ended. Here, the second reference value may be different from the first reference value. Specifically, the HARQ ACK/NACK determination operation may be performed only on the PSFCH whose RSRP or SINR is greater than the first reference value and less than the second reference value. The result of the judgment operation on some PSFCHs can be regarded as representing the judgment operation on all PSFCHs. According to this method, the data rate can be improved by using the above two methods.

Herein, each of k and the reference value can be preset by the manufacturer or user of the terminal 53 based on at least one of the channel status of the terminal 53, the performance of the terminal 53 and the total number of PSFCHs. In addition, for example, when a base station (for example, the base station 51 in FIG. 8) sets a side link, the terminal 53 may be instructed to set k to any value within a specific range.

Referring back to FIG. 11, when k PSFCHs are selected at operation S2000, the selected k PSFCHs may be sorted in ascending powers based on the measured RSRP or SINR at operation S2100.

Specifically, the processor 150 may rank the k PSFCHs in ascending powers based on the RSRP or SINR of the corresponding PSFCH measured by the transceiver 160.

When the sorting of the k PSFCHs in ascending power is completed, it can be determined in ascending order at operation S2200 whether the sorted k PSFCHs can be HARQ ACK or HARQ NACK, and at operation S2300, it may be determined based on the determination result whether to Retransmit PSSCH.

For reference, since the operations S2100 to S2300 may correspond to the operations S1100 to S1300 described above with reference to FIGS. 9 and 10, they will not be described in detail.

As described above, the PSFCH judgment method of the terminal according to the exemplary embodiment may be performed. Hereinafter, the wireless communication device implemented according to the embodiment will be explained with reference to FIG. 13.

FIG. 13 is a block diagram of a wireless communication device 201 according to an embodiment.

For reference, the wireless communication device 201 shown in FIG. 13 can be applied to a base station implemented according to an embodiment (for example, base station 51 in FIG. 2); eNB, gNB, and AP or terminal (for example, terminal 53 or 55 in FIG. 2) ; STA, MS and UE. In addition, in some embodiments, the wireless communication device 201 shown in FIG. 13 may operate in a standalone (SA) mode or a non-standalone (NSA) mode.

Specifically, FIG. 13 shows a wireless communication device 201 implemented in a network environment 200.

The wireless communication device 201 may include a bus 210, a processor 220, a memory 230, an input/output (I/O) interface 250, a display module 260, and a communication interface 270. In another case, the wireless communication device 201 may omit at least one of the above-mentioned components, or may further include at least one other component. However, for the sake of brevity, the exemplary embodiment is about an example in which the wireless communication device 201 includes the above-mentioned components.

The bus 210 can connect the processor 220, the memory 230, the I/O interface 250, the display module 260, and the communication interface 270 to each other. Therefore, the bus 210 can exchange and transmit signals, such as control messages and/or data, among the processor 220, the memory 230, the I/O interface 250, the display module 260, and the communication interface 270.

The processor 220 may include at least one of a central processing unit (CPU), an application processor (AP), and a communication processor (CP). In addition, the processor 220 may perform operations related to control and/or communication of other components of the wireless communication device 201 or data processing operations. In an embodiment, the processor 220 may be a component including the functions of the processor 150 shown in FIG. 7.

The memory 230 may include volatile memory and/or non-volatile memory. In addition, the memory 230 can store commands or instructions or data associated with other components in the wireless communication device 201.

In addition, the memory 230 can store software and/or programs 240. The program 240 may include, for example, a core 241, a middleware (middleware) 243, an application programming interface (API) 245, an application 247 (also referred to as an “application”), and network access information 249.

For reference, at least some of the core 241, the middleware 243, and the API 245 may be referred to as an operating system (OS). In addition, in an embodiment, the memory 230 may be a component including the functions of the memory 170 shown in FIG. 7.

For example, the I/O interface 250 can transmit commands or data received from a user or another external device to other components of the wireless communication device 201. In addition, the I/O interface 250 can output commands or data received from other components of the wireless communication device 201 to a user or another external device.

The display module 260 may include, for example, a liquid crystal display (LCD), a light-emitting diode (LED) display, an organic LED (organic LED, OLED) display, a micro electromechanical system (MEMS) ) Display or electronic paper display.

In addition, the display module 260 can display various content, such as text, image, video, icon, or code, to the user. The display module 260 may include a touch screen, and receive touch, gesture, proximity, or hovering input by, for example, using an electronic pen or a user's body part.

The communication interface 270 can set the communication between the wireless communication device 201 and external devices (such as the electronic devices 202 and 204 or the server 206). For example, the communication interface 270 can be connected to the network 262 through wireless communication or wired communication and communicate with external devices (such as the electronic device 204 or the server 206). In addition, the communication interface 270 can communicate with external devices (such as the electronic device 202) through wireless communication 264. In addition, the communication interface 270 may be a component including the functions of the transceiver 160 shown in FIG. 7.

For reference, wireless communication 264 may be a cellular communication protocol, and for example, use NR, LTE, LTE-A, CDMA, WCDMA, universal mobile telecommunication system (UMTS), wireless broadband (WiBro), and At least one of GSM. In addition, wired communication may include, for example, universal serial bus (USB), high-definition multimedia interface (HDMI), recommended standard 232 (RS-232), and simple old-fashioned At least one of the plain old telephone service (POTS).

In addition, the network 262 as a telecommunications network may include, for example, computer networks (such as local area network (LAN) or wide-area network (WAN)), Internet and telephone networks. At least one.

In addition, each of the electronic devices 202 and 204, which are external devices, may be the same type or different types from the wireless communication device 201. In addition, the server 206 may include a group of at least one server.

For reference, all or some of the operations performed by the wireless communication device 201 may be performed by other external devices (for example, the electronic devices 202 and 204 or the server 206).

In addition, when the wireless communication device 201 needs to perform a function or service automatically or upon request, the wireless communication device 201 can perform the function or service alone, or request other external devices (such as the electronic devices 202 and 204 or the server 206) to perform part of the function or service. Function or service. In addition, the other external devices (such as the electronic devices 202 and 204 or the server 206) can perform the requested function or service and transmit the result to the wireless communication device 201. In this case, the wireless communication device 201 can perform a function or service based on the received result or by processing the received result separately.

For the above mechanism, for example, cloud computing technology, distributed computing technology, or client-server computing technology can be applied to the wireless communication device 201.

According to the above-mentioned embodiment, the following problems can be solved by the high-efficiency ACK/NACK judging method using PSFCH to transmit signals for the maximum PSFCH transceiving capacity: exceeding the PSFCH receiving capacity and judging whether the PSFCH is ACK or NACK is overloaded. Therefore, the performance and operating efficiency of the terminal can be improved.

Although the embodiments have been specifically shown and described, it should be understood that various changes can be made to the embodiments in form and details without departing from the spirit and scope of the scope of the following patent applications.

21: The first terminal 23: second terminal 25: The third terminal 27: Fourth terminal 29: Fifth terminal 31: The sixth terminal 33: The seventh terminal 35: The eighth terminal 51: base station 53, 55: Terminal 90, 180: antenna 105: Front End Module (FEM) 110: RF integrated circuit (RFIC) 112: Transmitting circuit 114: receiving circuit 116: local oscillator 120: baseband circuit 122: Controller 124: Storage 125: signal processing unit 126: Demodulator 128: Receiving filter and cell searcher 130: other components 150, 220: processor 160: Transceiver 170, 230: memory 200: network environment 201: wireless communication device 202, 204: electronic devices 206: Server 210: Bus 240: program 241: Core 243: middle software 245: Application Programming Interface (API) 247: Application 249: Network Access Information 250: I/O interface 260: display module 262: network 264: wireless communication 270: Communication interface 1000: wireless communication system CH1: Channel/PSCCH CH2: Channel/PSSCH CH3: Channel/PSFCH S100, S150, S200, S250, S300, S1000, S1100, S1200, S1210, S1220, S1300, S1310, S1320, S1330, S1340, S1350, S2000, S2010, S2020, S2030, S2040, S2100, S2200, S2300: Operation SIG1, SIG2, SIG3: signal

Reading the following description in conjunction with the accompanying drawings, the above and other aspects, features and advantages of certain embodiments of the present disclosure will be more apparent. In the accompanying drawings: FIG. 1 is a diagram for explaining the unicast, multicast, and physical sidelink feedback channel (PSFCH) transmission process performed between terminals through a sidelink according to an embodiment. FIG. 2 is a diagram for explaining a process of transmitting a signal between a terminal and a base station and a process of transmitting and receiving channels between the terminals according to an embodiment. 3 to 5 are diagrams for explaining the structure of a time-frequency range (time-frequency range) applied to a side link of a New Radio (NR) communication system according to an embodiment. Fig. 6 is a block diagram of a radio-frequency (RF) transceiver component included in a terminal or a base station according to an embodiment. Fig. 7 is a simplified block diagram of the RF transceiver assembly shown in Fig. 6 according to an embodiment. Fig. 8 is a flowchart of a process of transmitting a message between a terminal and a base station according to an embodiment. Fig. 9 is a flowchart of a PSFCH judgment method of a terminal according to an embodiment. FIG. 10 is a detailed flowchart of operations S1200 and S1300 shown in FIG. 9 according to an embodiment. Fig. 11 is a flowchart of a PSFCH judgment method of a terminal according to an embodiment. FIG. 12 is a detailed flowchart of operation S2000 shown in FIG. 11 according to an embodiment. Fig. 13 is a diagram of a wireless communication device according to an embodiment.

51: base station

53: Terminal

S100, S150, S200, S250, S300: Operation

Claims (20)

A terminal configured to perform vehicle networking communication, the terminal including: The transceiver is configured to transmit and receive one or more wireless signals; and A processor configured to control the transceiver to transmit to the base station with respect to the maximum physical side link feedback channel (PSFCH) receiving capability, The maximum physical side link feedback channel receiving capability is the maximum number of physical side link feedback channels that can be received during a time transmission interval (TTI). The terminal according to claim 1, wherein the maximum physical side link feedback channel receiving capability is any one of 10, 20, 30, 40, 50, 100, 200, 300, and 410. The terminal according to claim 1, wherein the maximum physical sidelink feedback channel receiving capability includes the number of physical sidelink feedback channels received in at least one of groupcast and unicast. The terminal according to claim 1, wherein the time transmission interval includes a time slot. A terminal configured to perform vehicle networking communication, the terminal including: The transceiver is configured to transmit and receive one or more wireless signals; and The processor is configured as: Control the transceiver to measure the reference signal received power (RSRP) or signal-to-interference and noise of k physical side-link feedback channels in multiple physical side-link feedback channels (PSFCH) received during a time transmission interval. Signal Ratio (SINR), where k is an integer greater than 1, Sort the k physical side link feedback channels in ascending powers based on the received power of the reference signal or the signal-to-interference and noise ratio, Control the transceiver to determine in the ascending order whether the sorted k physical sidelink feedback channels are hybrid automatic repeat request (HARQ) acknowledgement (ACK) or hybrid automatic repeat request negative acknowledgement, and Based on the sequential determination, it is determined whether the physical side link shared channel (PSSCH) will be retransmitted. The terminal according to claim 5, wherein when the orderly judgment indicates that the m-th physical sidelink feedback channel of the k physical sidelink feedback channels that are sorted is the hybrid automatic repeat request response, The processor is further configured to: Determine whether m is less than k; and Control the transceiver to continue the sequential judgment on the remaining physical sidelink feedback channels among the k physical sidelink feedback channels that are sorted, or control the transceiver to end the sorted k Each entity sidelink feedback channel performs the sequential judgment, Where m is a positive integer less than or equal to k. The terminal according to claim 6, wherein when m is less than k, the processor is further configured to control the transceiver to continue to side-link back the remaining entities in the sorted k entities The side link feedback channel performs the sequential judgment. The terminal according to claim 6, wherein when m is equal to k, the processor is further configured to control the transceiver to end the sequential determination, and based on whether the multiple physical side link feedback channels are There is at least one physical side-link feedback channel that has not been subjected to the sequential determination to determine whether to continue measuring the reference signal received power or signal-to-interference and noise ratio of the additional physical side-link feedback channel. The terminal according to claim 8, wherein when the at least one physical sidelink feedback channel for which the sequential determination has not been performed exists among the plurality of physical sidelink feedback channels, the processor is further Configured to control the transceiver to continue to measure the received power of the reference signal or the signal-to-interference and noise ratio of the additional entity sidelink feedback channel, and When the sequential determination is performed on all the multiple physical sidelink feedback channels, the processor is further configured to control the transceiver to end the sequential determination. The terminal according to claim 5, wherein when it is determined that the m-th physical side-link feedback channel among the k physical side-link feedback channels that are sorted is the hybrid automatic repeat request negative response, the processor It is also configured as: Control the transceiver to interrupt the sequential judgment on the remaining physical side-link feedback channels among the k physical side-link feedback channels that are sorted, and Retransmit the physical side-link shared channel, Where m is a positive integer less than or equal to k. The terminal according to claim 5, wherein k is set based on at least one of the following: the channel status of the terminal, the performance of the terminal, and the total number of the multiple physical side link feedback channels. A terminal configured to perform vehicle networking (V2X) communication, the terminal including: The transceiver is configured to transmit and receive one or more wireless signals; and The processor is configured as: Control the transceiver to measure the reference signal received power (RSRP) or signal-to-interference and noise ratio (SINR) of multiple physical side-link feedback channels (PSFCH) received during a time transmission interval (TTI), Select k physical side-link feedback channels satisfying a preset criterion from the plurality of physical side-link feedback channels, where k is an integer greater than 1, Sort the selected k physical side link feedback channels in ascending powers based on the received power of the reference signal or the signal-to-interference and noise ratio, Controlling the transceiver to determine in the ascending order whether the sorted k physical sidelink feedback channels are hybrid automatic repeat request (HARQ) acknowledgement (ACK) or hybrid automatic repeat request negative acknowledgement (NACK), and Based on the sequential determination, it is determined whether the physical side link shared channel (PSSCH) will be retransmitted. The terminal according to claim 12, wherein when the received power of the reference signal or the signal-to-interference and noise ratio is less than a preset reference value, the preset criterion is satisfied. The terminal according to claim 12, wherein when the reference signal received power or the signal-to-interference and noise ratio is greater than a preset reference value, the preset criterion is satisfied. The terminal according to claim 12, wherein when the reference signal received power or the signal-to-interference and noise ratio is greater than a first reference value and less than a second reference value, the preset criterion is satisfied, The second reference value is different from the first reference value. The terminal according to claim 12, wherein when it is determined that the m-th physical side-link feedback channel among the k physical side-link feedback channels that are sorted is the hybrid automatic repeat request response, the processor further Is configured as: Determine whether m is less than k; and Controlling the transceiver to continue the sequential judgment on the remaining physical sidelink feedback channels among the k physical sidelink feedback channels sorted, or controlling the transceiver to end the sequential judgment, Where m is a positive integer less than or equal to k. The terminal according to claim 16, wherein when m is less than k, the processor is further configured to control the transceiver to continue the sequential judgment on the remaining physical sidelink feedback channels. The terminal according to claim 16, wherein when m is equal to k, the processor is further configured to control the transceiver to end the sequential determination, and based on whether the multiple physical side link feedback channels are There is at least one physical side link feedback channel for which the sequential determination has not been performed to determine whether to continue to select additional physical side link feedback channels. The terminal according to claim 18, wherein when the at least one physical side link feedback channel for which the sequential determination has not been performed exists among the plurality of physical side link feedback channels, the processor is further Configured to select the additional entity sidelink feedback channel, and When the sequential determination is performed on all the multiple physical sidelink feedback channels, the processor is further configured to control the transceiver to end the sequential determination. The terminal according to claim 12, wherein when it is determined that the m-th physical side-link feedback channel among the k physical side-link feedback channels that are sorted is the hybrid automatic repeat request negative response, the processor It is also configured as: Controlling the transceiver to interrupt the sequential judgment on the remaining physical side-link feedback channels among the k physical side-link feedback channels that are sorted; and Retransmit the physical side-link shared channel, Where m is a positive integer less than or equal to k.

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