Apparatus and method for transceiving physical sidelink feedback channel in wireless communication system

Abstract

A terminal and an operation method of the terminal are provided. An operating method of a terminal configured to perform vehicle-to-outside (V2X) communication in a wireless communication system includes signaling a maximum physical sidelink feedback channel (PSFCH) reception capability to a base station; and receiving a wireless signal transmitted from the base station based on a maximum PS FCH reception capability, where the maximum PSFCH reception capability is a maximum number of PSFCHs receivable within one transmission time interval (TTI).

Description

[0001] This application is a divisional application based on the Chinese patent application filed on February 7, 2021, with application number 202110177180.0 and invention name “Device for transmitting and receiving physical side link feedback channel in a wireless communication system”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application is based on and claims the benefit of U.S. Provisional Application No. 62 / 977,430 filed in the U.S. Patent and Trademark Office on February 17, 2020, U.S. Provisional Application No. 63 / 024,098 filed in the U.S. Patent and Trademark Office on May 13, 2020, and Korean Patent Application No. 10-2020-0096942 filed in the Korean Intellectual Property Office on August 3, 2020, the disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0004] The present disclosure relates to an apparatus and method for efficiently transceiving a physical sidelink feedback channel (PSFCH) in a wireless communication system to perform vehicle-to-everything (V2X) communication. Background Art

[0005] In order to meet the growing demand for wireless data traffic after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop the fifth generation (5G) communication system.

[0006] Therefore, 5G communication systems have been commercialized recently. In order to achieve high data transmission rates, 5G communication systems can be implemented in ultra-high frequency bands (e.g., millimeter wave (mmWave) bands or, for example, 60 GHz (GHz) bands). In order to reduce the path loss of radio waves and increase the distance that radio waves propagate in ultra-high frequency bands, beamforming technology, massive multiple-input multiple-output (MIMO) technology, full-size MIMO (FD-MIMO) technology, array antennas, analog beamforming technology, and wide-range antenna technology have been or will be applied to 5G communication systems.

[0007] In addition, in order to improve the network of the communication system, technologies such as evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, collaborative communication, multi-point coordination (CoMP) and received interference cancellation have been or will be applied to the 5G communication system.

[0008] In addition, advanced coding modulation (ACM) technologies such as hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) have been or will be applied to 5G communication systems.

[0009] In addition, unlike long-term evolution (LTE) V2X communication that only supports broadcast, unicast and multicast are also supported in Release 16 (Rel-16) new-ratio (NR) V2X communication. In addition, PSFCH has been newly defined to improve the reliability of unicast and multicast. Therefore, a transmitting terminal (e.g., a terminal configured to transmit a signal and / or a channel) can receive acknowledgement / negative acknowledgement (ACK / NACK) feedback from a receiving terminal (e.g., a terminal configured to receive a signal and / or a channel) via PSFCH, and therefore, a hybrid automatic repeat request (HARQ) can be enabled.

[0010] For reference, a low peak-to-average power ratio (PAPR) sequence based on a Zadoff-Chu sequence may be applied to the PSFCH, and the 1-bit HARQ-ACK / NACK contained in the PSFCH may have the above-mentioned sequence format. In addition, the PSFCH may be transmitted in units of 1 resource block (RB), and code division multiplexing (CDM) may be applied to the PSFCH so that multiple users (or terminals) may transmit the PSFCH through one RB.

[0011] However, since the transmitting terminal can simultaneously receive HARQ ACK / NACK from multiple receiving terminals in a multicast mode, the number of PSFCHs to be received by the transmitting terminal may increase as the number of receiving terminals included in the group increases. However, since the maximum number of PSFCHs that can be received by the terminal is not defined in the current third generation partnership project (3GPP) standard, the number of received PSFCHs may exceed the PSFCH receiving capability of the transmitting terminal depending on the situation. In addition, since the transmitting terminal must determine whether all PSFCHs received from multiple receiving terminals are ACK or NACK, the operation of determining whether the PSFCH is ACK or NACK may increase the workload of the transmitting terminal. Summary of the invention

[0012] Provided are an apparatus and method for efficiently transceiving a physical sidelink feedback channel (PSFCH) in a wireless communication system to perform vehicle-to-everything (V2X) communication.

[0013] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0014] According to one aspect of the present disclosure, an operating method of a terminal configured to perform vehicle-to-external (V2X) communication in a wireless communication system includes: signaling a maximum physical sidelink feedback channel (PSFCH) reception capability to a base station, wherein the maximum PSFCH reception capability is the maximum number of PSFCHs that can be received during one transmission time interval (TTI).

[0015] According to one aspect of the present disclosure, an operating method of a terminal configured to perform vehicle-to-external (V2X) communication in a wireless communication system includes: signaling a maximum physical sidelink feedback channel (PSFCH) transmission capability to a base station, wherein the maximum PSFCH transmission capability is the maximum number of PSFCHs that can be transmitted during one transmission time interval (TTI).

[0016] According to one aspect of the present disclosure, a terminal configured to perform vehicle-to-everything (V2X) communication includes: a transceiver configured to transmit and receive one or more wireless signals;

[0017] and a processor configured to control the transceiver to send signaling for a maximum physical sidelink feedback channel (PSFCH) reception capability to a base station, wherein the maximum PSFCH reception capability is the maximum number of PSFCHs that can be received during a transmission time interval (TTI).

[0018] According to one aspect of the present disclosure, a terminal configured to perform vehicle-to-everything (V2X) communication includes: a transceiver configured to transmit and receive one or more wireless signals;

[0019] and a processor configured to control the transceiver to send signaling for a maximum physical sidelink feedback channel (PSFCH) transmission capability to a base station, wherein the maximum PSFCH transmission capability is the maximum number of PSFCHs that can be transmitted during a transmission time interval (TTI).

[0020] According to one aspect of the present disclosure, a terminal configured to perform vehicle-to-external (V2X) communication includes: a transceiver configured to send and receive one or more wireless signals; and a processor configured to: control the transceiver to measure a reference signal received power (RSRP) or a signal to interference plus noise ratio (SINR) of k PSFCHs among a plurality of physical side link feedback channels received during a transmission time interval (TTI), wherein k

[0021] is an integer greater than 1; sorting the k PSFCHs in ascending order based on the RSRP or the SINR; controlling the transceiver to perform such an order determination: the k PSFCHs sorted in ascending order are hybrid automatic repeat request (HARQ) acknowledgment (ACK) or HARQ negative acknowledgment (NACK); and determining whether to retransmit a physical sidelink shared channel (PSSCH) based on the order determination.

[0022] According to one aspect of the present disclosure, a terminal configured to perform vehicle-to-external (V2X) communication includes: a transceiver configured to send and receive one or more wireless signals; and a processor configured to control the transceiver to measure a reference signal received power (RSRP) or a signal to interference plus noise ratio (SINR) of multiple physical side link feedback channels (PSFCHs) received during a transmission time interval (TTI); select k PSFCHs that meet a preset standard from the multiple PSFCHs, where k is an integer greater than 1; arrange the selected k PSFCHs in ascending order based on the RSRP or the SINR; control the transceiver to perform such a sequence determination: whether the k PSFCHs sorted in ascending order are hybrid automatic repeat request (HARQ) acknowledgments (ACKs) or HARQ negative acknowledgments (NACKs); and determine whether to retransmit a physical side link shared channel (PSSCH) based on the sequence determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a diagram for explaining unicast, multicast, and physical sidelink feedback channel (PSFCH) transmission procedures performed between terminals through a side link according to an embodiment;

[0025] Figure 2 is a diagram for explaining a process of sending signaling between a terminal and a base station and a process of transceiving a channel between terminals according to an embodiment;

[0026] Figures 3 to 5 is a diagram for explaining a structure of a time-frequency range of a side link applied to a New Radio (NR) communication system according to an embodiment;

[0027] Figure 6 is a block diagram of a radio frequency (RF) transceiver component included in a terminal or a base station according to an embodiment;

[0028] Figure 7 According to the embodiment Figure 6 A simplified block diagram of the RF transceiver components;

[0029] Figure 8 is a flowchart of a process of sending signaling between a terminal and a base station according to an embodiment;

[0030] Fig. 9 is a flowchart of a PSFCH determination method of a terminal according to an embodiment;

[0031] Fig.10 According to the embodiment Fig. 9 Detailed flowchart of operations S1200 and S1300;

[0032] Fig.11 is a flowchart of a PSFCH determination method of a terminal according to an embodiment;

[0033] Fig.12 According to the embodiment Fig.11 A detailed flowchart of operation S2000; and

[0034] Fig.13 is a diagram of a wireless communication device according to an embodiment. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

[0036] Various example embodiments will now be described more fully with reference to the accompanying drawings showing some example embodiments. However, embodiments may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. Embodiments may be interchangeable with each other. On the contrary, these embodiments are provided to make this disclosure thorough and complete, and to fully convey the scope to those skilled in the art. Even when the content described in a particular embodiment is not described in other embodiments, the content may also be understood to be relevant to other embodiments, unless otherwise stated or the content contradicts the particular embodiment in other embodiments. Throughout the specification, the same reference numerals generally represent the same elements.

[0037] The terms used herein are only used to describe specific embodiments and are not intended to limit the scope of other embodiments. Unless otherwise clearly indicated in the context, expressions in the singular may include expressions in the plural. It will be further understood that when used herein, the terms "include", "comprise", "contain", and / or "have" indicate the presence of the features, items, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, items, steps, operations, elements, components, and / or their groups.

[0038] Unless otherwise defined, all terms (including technical and scientific terms) used herein will be interpreted as common terms in the field to which the present disclosure belongs. It will be further understood that, unless explicitly defined herein, terms of common usage will also be interpreted as common terms in the relevant field, rather than idealized or overly formalized meanings.

[0039] In addition, the embodiments will be described in detail by focusing on the New Radio (NR) system and the Long Term Evolution (LTE) / Advanced LTE (LTE-A) system. However, according to the judgment of those skilled in the art, the embodiments can be applied not only to other communication systems with similar technical backgrounds, but also to other communication systems using licensed and unlicensed frequency bands with slight modifications within the scope of the present disclosure.

[0040] Before the following detailed description, the definitions of several words and phrases used throughout the specification will be described. The expression "connected (combined / accessed) to" and its derivatives may 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 "send", "receive" and "communication" and their derivatives may include direct communication and indirect communication. The terms "include" and "comprise" and their derivatives may refer to including but not limited to. The term "or" may be an inclusive word meaning "and / or". The expression "related to..." and its derivatives may refer to including..., included in..., interconnected with..., including..., included in..., connected to... / connected with..., combined to... / combined with..., communicate with..., cooperate with..., between..., placed in parallel..., adjacent to..., bound by..., having..., characterized by..., having a relationship with..., etc. The term "controller" refers to a device, system, or part thereof that controls at least one operation. The controller may be implemented in hardware or a combination of hardware and software and / or firmware. Functions associated with any particular controller may be centralized or distributed locally or remotely. When the expression "at least one" precedes a 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 any of the following: A, B, C, both A and B, both A and C, both B and C, and a combination of A, B, and C.

[0041] The various functions described below can be implemented or supported by one or more computer programs, and each computer program can be composed of computer readable program code and executed on computer readable medium. As used herein, the terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, examples, related data or their parts that are suitable for implementing suitable computer readable program code. The term "computer readable program code" includes all types of computer codes, including source code, object code and execution code. The term "computer readable medium" includes all types of media, such as read-only memory (ROM), random access memory (RAM), hard disk drive (HDD), compact disk (CD), digital video disk (DVD) or any other type of memory that a computer can access. "Non-transient" computer readable medium does not include wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transient computer readable medium includes a medium in which data can be permanently stored and a medium that can store and overwrite data later, such as a rewritable optical disk or an erasable memory device.

[0042] In the various embodiments described below, the hardware access method will be described as an example. However, the various embodiments include techniques using both hardware and software, and therefore, the various embodiments do not exclude software-based access methods.

[0043] In the following description, for the sake of brevity, as examples, terms referring to control information, terms referring to entries, terms referring to network entities, terms referring to messages, and terms referring to components of devices will be provided. Therefore, the embodiments are not limited by the terms described below, and other terms with equivalent technical meanings may be used instead.

[0044] Figure 1 is a diagram for explaining unicast, groupcast, and physical sidelink feedback channel (PSFCH) transmission processes performed between terminals through a side link according to an exemplary embodiment.

[0045] Figure 1 A plurality of terminals configured to perform vehicle-to-external (V2X) communications according to an example are shown, such as a first terminal 21 , a second terminal 23 , a third terminal 25 , a fourth terminal 27 , a fifth terminal 29 , a sixth terminal 31 , a seventh terminal 33 , and an eighth terminal 35 .

[0046] 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 through a side link.

[0047] although Figure 1 An example is shown in which a signal is transmitted from the first terminal 21 to the second terminal 23, but the signal may be transmitted in the opposite direction. That is, a signal may be transmitted from the second terminal 23 to the first terminal 21.

[0048] In addition, the operation of exchanging signals between the first terminal 21 and the second terminal 23 by unicast may include performing a scrambling process, a control information mapping process, a data transmission process, and a unique identification (ID) value verification process by using a resource or value known between the first terminal 21 and the second terminal 23. Moreover, the first terminal 21 and the second terminal 23 may be mobile terminals, for example, vehicles.

[0049] Thereafter, it can be seen that the communication scheme between the third terminal to the fifth terminal 25, 27 and 29 is multicast communication, in which the third terminal 25 sends public data to other terminals in the group, such as the fourth terminal 27 and the fifth terminal 29, through a side link.

[0050] During the multicast communication, other terminals (eg, the second terminal 23 and the seventh terminal 33 ) not included in the group may not receive a signal for the multicast transmitted by the third terminal 25 .

[0051] For reference, the terminal configured to send a signal for multicast 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 sending signals may be determined by a base station or terminal serving as a group leader in the group, or the allocation of resources for sending signals may be selected by the terminal configured to send signals. In addition, the third to fifth terminals 25, 27, and 29 may be mobile terminals such as vehicles.

[0052] Finally, the communication between the sixth terminal to the eighth terminal 31, 33 and 35 will now be examined. The communication scheme may include a communication in which the seventh terminal 33 and the eighth terminal 35 receive common data from the sixth terminal 31 in a multicast communication manner, and feedback of information related to the success or failure of receiving the common data is sent to the sixth terminal 31. Although not shown, feedback of information related to the success or failure of receiving the data may also be transmitted between terminals (e.g., the first terminal 21 and the second terminal 23) in unicast communication.

[0053] For reference, information related to the success or failure of receiving data may be hybrid automatic repeat request (HARQ)-acknowledgement / negative acknowledgement (ACK / NACK) information, which may be included in the PSFCH. In addition, the sixth to eighth terminals 31, 33, and 35 may be mobile terminals such as vehicles.

[0054] As described above, various communication schemes may be applied between a plurality of terminals (e.g., the first to eighth terminals 21, 23, 25, 27, 29, 31, 33, and 35) configured to perform V2X communication according to an exemplary embodiment. Figure 2 .

[0055] Figure 2 is a diagram for explaining a process of transmitting signaling between a terminal and a base station and a process of transceiving a channel between terminals according to an exemplary embodiment.

[0056] Reference Figure 2 , the wireless communication system 1000 according to an example embodiment may include a base station 51 and a plurality of terminals, for example, a terminal 53 and a terminal 55 .

[0057] For reference, although for brevity, Figure 2 An example is shown in which the wireless communication system 1000 includes only two terminals 53 and 55 and one base station 51, but the present disclosure is not limited thereto. That is, the wireless communication system 1000 may include more or less terminals and base stations.

[0058] in addition, Figure 2Each of the terminals 53 and 55 shown in FIG. 5 may be capable of V2X communication, for example, referring to FIG. Figure 1 Unicast, multicast and PSFCH transmission described in Figure 2 , unicast communication between two terminals 53 and 55 is shown, but Figure 2 It can be interpreted as a diagram of multicast communication between some terminals in the group.

[0059] 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 an NR communication system, an LTE communication system, an advanced LTE (LTE-A) communication system, a code division multiple access (CDMA) communication system, and a 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 any other wireless communication system.

[0060] The wireless communication network used in the wireless communication system 1000 can share available network resources and support communication of a plurality of wireless communication devices included in the terminal 53 and the terminal 55 .

[0061] For example, in a wireless communication network, various multiple access methods such as CDMA, frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal FDMA (OFDMA), single carrier FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA and OFDM-CDMA can be used to send information.

[0062] In an embodiment, the wireless communication system 1000 may be an NR communication system. However, the exemplary embodiments are not limited thereto and may also be applied to previous and next generation wireless communication systems.

[0063] In addition, the base station 51 may refer to a fixed station configured to communicate with the terminal 53 and the terminal 55 and / or another base station. The base station 51 may communicate with the terminal 53 and the terminal 55 and / or another base station, and may exchange data and control information with the terminal 53 and the terminal 55 and / or another base station.

[0064] For example, the base station 51 may be referred to as a Node B, an evolved Node B (eNB), a next generation Node B (gNB), a sector, a site, a base transceiver system (BTS), an access point (AP), a relay node, a remote radio head (RRH), or a radio unit (RU).

[0065] In this embodiment, the base station 51 may be interpreted as a base station controller (BSC) of CDMA, a node B of wideband CDMA (WCDMA), an eNB of LTE, a gNB of NR, or a partial area or function covered by a sector (site). The terminal 53 and the terminal 55 may be a fixed device as a user device or a mobile device as a vehicle, and may refer to any device capable of communicating with the base station 51 and sending data and / or control information to the base station 51 and receiving data and / or control information from the base station 51.

[0066] For example, terminal 53 and terminal 55 may be referred to as a wireless station (STA), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a user equipment (UE), a subscriber station (SS), a wireless device, a handheld device, or a vehicle.

[0067] In addition, the base station 51 can be connected to the terminal 53 and the terminal 55 through a wireless channel, and can provide various communication services to the terminal 53 and the terminal 55 through the connected wireless channel. Moreover, all user services of the base station 51 can be served through a shared channel. In addition, the base station 51 can schedule the terminal 53 and the terminal 55 by collecting status information such as PSFCH capability, buffer status, available transmission power status, and channel status of the terminal 53 and the terminal 55.

[0068] In addition, the wireless communication system 1000 may support a beamforming technology using an orthogonal frequency division multiplexing (OFDM) scheme. In addition, the wireless communication system 1000 may support an adaptive modulation and coding (AMC) scheme that determines a modulation scheme and a channel coding rate based on the channel status of the terminal 53 and the terminal 55.

[0069] For reference, the wireless communication system 1000 may transmit and receive signals using a wide frequency band including not only a frequency band less than 6 GHz but also a frequency band of 6 GHz or more.

[0070] For example, the wireless communication system 1000 may increase the data transmission rate by using a millimeter wave band such as a 28 GHz band or a 60 GHz band.

[0071] In the millimeter wave band, the signal attenuation per unit distance may be relatively large. Therefore, the wireless communication system 1000 can support transceiver operations based on directional beams to ensure coverage. In addition, the wireless communication system 1000 can perform beam scanning operations based on directional beams to enable transceiver operations.

[0072] Here, the beam scanning operation may instruct the terminal 53 and the terminal 55 and the base station 51 to sequentially or randomly scan the directional beams having a predetermined pattern to determine the transmission beam and the reception beam whose orientation directions are aligned with each other. That is, the pattern of the transmission beam and the reception beam whose orientation directions are aligned with each other may be determined as a pair of beam patterns. Moreover, the beam pattern may refer to the shape of the beam, which is determined based on the width of the beam and the orientation direction of the beam.

[0073] Because 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 the communication between the terminals 53 and 55 and the base station 51 will now be described in further detail.

[0074] The terminal 53 and the terminal 55 can send signals SIG1, SIG2, SIG4 and SIG4 to the base station 51 and receive signals SIG1, SIG2, SIG4 and SIG4 from the base station 51 through an uplink or a downlink, and access the network of the wireless communication system 1000. The link between the terminal 53 and the terminal 55 and the base station 51, such as a data transceiver interface, can be referred to as a Uu link. In addition, in order to exchange various setting information required for signal transceiver operations between the terminal 53 and the terminal 55 and the base station 51, a radio resource control (RRC) connection can be performed between the terminal 53 or the terminal 55 and the base station 51. The RRC connection can be referred to as Uu-RRC.

[0075] Specifically, for example, the terminal 53 and the terminal 55 may send a signal SIG2 and a signal SIG4 for the maximum number of PSFCHs that can be transceived during one transmission time interval (TTI) (e.g., time slot) to the base station 51. In an embodiment, the maximum number of PSFCHs that can be transceived during one TTI may be referred to as the highest PSFCH transceiver capability or the maximum PSFCH transceiver capability. In addition, the information about the maximum PSFCH transceiver capability may correspond to RRC information, which may be one of the user equipment (UE) capability information elements. Therefore, due to RRC signaling, the terminal 53 and the terminal 55 may send a signal SIG2 and a signal SIG4 for the maximum PSFCH transceiver capability to the base station 51. Therefore, the information about the maximum PSFCH transceiver capability may be included in a physical uplink shared channel (PUSCH). In addition to the PUSCH, the information about the maximum PSFCH transceiver capability may also be included in a physical uplink control channel (PUCCH) or a physical random access channel (PRACH), but the example embodiment relates to an example in which the information is included in the PUSCH.

[0076] For reference, in this embodiment, the contents disclosed in Table 1 may be reintroduced and defined in conjunction with the maximum PSFCH transceiving capability of the terminal. Therefore, the terminal 53 and the terminal 55 may signal the maximum PSFCH transceiving capability to the base station 51 based on the items described in Table 1.

[0077] Table 1

[0078]

[0079]

[0080] For example, "UE capability signaling" of item (1) of Table 1 may be expressed as shown in Table 2 below.

[0081] Table 2

[0082]

[0083] For example, "UE capability signaling" of item (2) of Table 1 may be expressed as shown in Table 3 below.

[0084] Table 3

[0085]

[0086] Furthermore, the contents disclosed in Table 1 may be arranged as in Table 4-1 and Table 4-2 below.

[0087] Table 4-1

[0088]

[0089] Table 4-2

[0090]

[0091] For reference, Table 4-1 and Table 4-2 are tables that are divided into a continuous table due to limited space.

[0092] As described above, in an example embodiment, terminal 53 or terminal 55 may signal the maximum PSFCH transceiving capability to base station 51, an example of which will be referred to in Figure 8 Further detailed description. In addition, the base station 51 can perform RRC signaling, for example, signal SIG1 and signal SIG3, to the terminal 53 and the terminal 55 based on the signaling from the terminal 53 and the terminal 55, and perform a scheduling operation for sending and receiving signals (for example, PSSCH, PSCCH, and PSFCH) between the terminal 53 and the terminal 55, or perform a setting operation related to multicast, for example, selecting a group leader in the group and setting the size of the area used for multicast.

[0093] For reference, terminal 53 and terminal 55 can receive scheduling information for sidelink communication based on RRC signaling (e.g., signal SIG1 and signal SIG3) from base station 51 or information of a physical downlink control channel (PDCCH) (e.g., downlink control information (DCI)).

[0094] In addition, the terminal 53 and the terminal 55 can send and receive signals to each other through a side link, for example, a channel CH1, a channel CH2, and a channel CH3. The side link between the terminal 53 and the terminal 55, such as a data transceiver interface, can be referred to as a PC5 link. In addition, in order to exchange various setting information required for transceiving signals between the terminal 53 and the terminal 55, an RRC connection can be performed between the terminal 53 and the terminal 55. The RRC connection can be referred to as a PC5-RRC.

[0095] Here, the channels transmitted and received via the side link may include, for example, a side link control channel (e.g., a physical side link control channel (PSCCH)), a side link shared channel or data channel (e.g., a physical side link shared channel (PSSCH)), a side link broadcast channel (e.g., a physical side link broadcast channel (PSBCH) broadcasted using a synchronization signal), and a feedback transmission channel (e.g., a physical side link feedback channel (PSFCH)).

[0096] 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 reception operation in the side link may be referred to as a receiving terminal. Both the transmitting terminal and the receiving terminal may perform a data transmission operation and a data reception operation, respectively, in the side link.

[0097] The transmitting terminal 53 may generate sidelink scheduling information, for example, sidelink control information (SCI), based on the scheduling information provided by the base station 51. In addition, the transmitting terminal 53 may transmit a PSCCH CH1 including the generated sidelink scheduling information to the receiving terminal 55.

[0098] Here, the side link scheduling information may be transmitted to the receiving terminal 55 as a single SCI, or the side link scheduling information may be divided into two parts of SCI and transmitted to the receiving terminal 55. For reference, the method of dividing the side link scheduling information into two parts of SCI and transmitting them to the receiving terminal 55 may be referred to as a 2-level SCI or a 2-level PSCCH.

[0099] The transmitting terminal 53 may transmit 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 feedback to the transmitting terminal 53 on PSFCH CH3, the feedback including information related to the reception success or failure of PSSCH CH2 transmitted by the transmitting terminal 53, such as HARQ-ACK / NACK. Therefore, the transmitting terminal 53 may determine whether the PSFCH CH3 received from the receiving terminal 55 includes HARQ ACK or NACK, and determine whether to retransmit PSSCH CH2 based on the determination result.

[0100] As described above, various signals or channels may be sent and received between terminal 53 and terminal 55 and base station 51, as will be described in further detail below.

[0101] The wireless communication system 1000 according to the exemplary embodiment has the features and configurations as described above. Figures 3 to 5 A structure of a time-frequency range of a side link applied to an NR communication system according to an exemplary embodiment is described.

[0102] For reference, Figures 3 to 5 The structure of the time-frequency range shown may be an example of a time-frequency range that can be applied to the present embodiment, and therefore, the present disclosure is not limited thereto. Figures 3 to 5 The structure of the time-frequency range shown is described as an example.

[0103] First, refer to Figure 3 , the horizontal line represents the time region, and the vertical line represents the frequency range. The smallest transmission unit in the time domain can be an OFDM symbol, and N symb OFDM symbols may form a time slot. The length of a subframe may be 1.0 ms, and the length of a radio frame may be 10 ms. The minimum transmission unit within a frequency range may be a subcarrier, and the system transmission bandwidth may include N BW The total number of subcarriers.

[0104] In the time-frequency domain, the basic unit of resources can be a resource element (RE), which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) or a physical resource block (PRB) can be represented by N in the time domain. symb consecutive OFDM symbols and N in the frequency domain RB Therefore, one RB may include N consecutive subcarriers. symb ×N RB RE.

[0105] For reference, the minimum transmission unit of data can usually be an RB unit. In the NR communication system, usually, N symbCan be at least one, N RB can be equal to 12, and N BW and N RB It can be proportional to the system transmission bandwidth. Moreover, the data rate can increase in proportion to the number of RBs scheduled for the terminal.

[0106] In addition, the channel bandwidth may indicate an RF bandwidth corresponding to the system transmission bandwidth. For example, in an NR communication system with a channel bandwidth of 100 MHz at a subcarrier width of 30 kHz, the transmission bandwidth may include 273 RBs.

[0107] Based on the above description, refer to Figure 4 and Figure 5 , shows the subchannels and resource pools defined to improve resource usage efficiency in Release-16 (Rel-16) NR V2X communications. For reference, Figure 4 The basic frame structure of NR V2X communication and Level 2 PSCCH is shown in FIG. 1 , such as the structure in the time-frequency domain. In addition, Figure 5 The resource pool is shown in FIG.

[0108] Specifically, in NR V2X communication, one time slot may include at least one resource pool, and each resource pool may include multiple subchannels. Here, the size of the subchannel may be, for example, any one of 10 RBs, 15 RBs, 20 RBs, 25 RBs, 50 RBs, 75 RBs, and 100 RBs. However, depending on the situation, the size of the subchannel may be any one of 4 RBs, 5 RBs, and 6 RBs. As an example, Figure 4 An example including subchannel #1 and subchannel #2 is shown, and each of subchannel #1 and subchannel #2 includes 15 RBs, shown as RB#0 of subchannel #1 to RB#14 of subchannel #1, and RB#0 of subchannel #2 to RB#14 of subchannel #2.

[0109] In addition, the 0th symbol (symbol 0) of the slot may be a symbol for automatic gain control (AGC) training.

[0110] In addition, a PSFCH for determining whether the PSSCH is received normally may be allocated and transmitted in the 12th symbol (symbol 12) of the time slot. The transmission timing may be in two or three time slots after the time slot in which the PSSCH is transmitted. For example, when the PSSCH is transmitted in time slot A, the PSFCH corresponding to the PSSCH may be fed back and transmitted in time slot A+2 or time slot A+3.

[0111] For reference, the PSFCH may include 1 PRB (or 1 RB) and be transmitted for each subchannel. In addition, the transceiver period of each PSFCH may be set, and the minimum value of the transceiver period may be defined as 1, such as 1 time slot unit. Since multiple PSFCHs can use the same resources, up to six cyclic shifts may be applied to different PSFCHs transmitted to the same RB. Therefore, a maximum of ((273 PRBs) / (4 PRBs / subchannel)*6 cyclic shift pairs / subchannel)≈410 PSFCHs may be transmitted during each time slot.

[0112] The AGC (AGC (PSFCH)) for receiving the PSFCH can be allocated to the symbol immediately before the PSFCH (e.g., symbol 11). Since the transmission object (e.g., the transmitting terminal) of the 0th to 9th symbols (symbols 0 to 9) is different from the transmitting terminal (e.g., the receiving terminal) of the 11th and 12th symbols (symbols 11 and 12), it may be necessary to use the AGC of the PSFCH separately.

[0113] In addition, the guard symbol may be allocated to the 10th symbol and the 13th symbol (symbol 10 and symbol 13) to ensure the guard time for timing advance. Since the transmission object of the 0th to 9th symbols (symbol 0 to symbol 9) is different from the transmission terminal of the 11th and 12th symbols (symbols 11 and 12), the receiver may misalign the symbol timing, so the guard symbol may be required.

[0114] A demodulation reference signal (DMRS), a PSCCH, and a PSSCH may be allocated to the 1st symbol to the 9th symbol (symbol 1 to symbol 9) in addition to the above-mentioned channels and symbols. In addition, a PSFCH, an AGC, and a guard symbol may be allocated to the 1st symbol to the 9th symbol (symbol 1 to symbol 9). However, for the sake of simplicity, the example embodiment relates to an example in which the PSFCH, the AGC, and the guard symbol are allocated to the 10th symbol to the 13th symbol.

[0115] For reference, in NR V2X communication, since the PSCCH is transmitted through two stages, the first PSCCH may be initially allocated to the PSCCH scheduling range, and the second PSCCH may be allocated to the PSSCH range.

[0116] More specifically, the first PSCCH may appear from the lowest RB of the subchannel (e.g., RB#0 of subchannel#0) and include a first SCI. In addition, the first SCI may include allocation information of the PSSCH (e.g., frequency domain resource allocation (FDRA) and time domain resource allocation (TDRA)) and allocation information of the second PSCCH. The second PSCCH may include a second SCI and is first allocated to the lowest RE other than the RE of the DMRS in the first DMRS symbol (e.g., DMRS of symbol 0), such as SC#1, where SC refers to a subcarrier. In addition, the second SCI may include information required to decode the PSSCH.

[0117] As described above, according to this embodiment, the time-frequency range of the side link applied to the NR communication system can be configured. Figure 6 and Figure 7 A configuration of a Radio Frequency (RF) transceiver of a terminal or a base station according to an exemplary embodiment is described.

[0118] Figure 6 is a block diagram of RF transceiver components included in a terminal or a base station according to an example embodiment. Figure 7 According to the embodiment Figure 6 A simplified block diagram of the RF transceiver components.

[0119] For reference, Figure 6 and Figure 7 The RF transceiver components may be included in the Figure 2 In the terminal 53 or the terminal 55 or the base station 51. Moreover, Figure 6 and Figure 7 The RF transceiver components may include both components in the transmit path and components in the receive path.

[0120] In the following, for the sake of brevity, Figure 6 and Figure 7 The RF transceiver components shown are included in the Figure 2 In addition, the components in the receiving path will be described as the center. Figure 6 The baseband circuit 120 is provided.

[0121] First, refer to Figure 6 , a terminal such as terminal 53 may include an antenna 90 , a front end module (FEM) 105 , an RF integrated circuit (RFIC) 110 , and a baseband circuit 120 .

[0122] The antenna 90 may be connected to the FEM 105, and may transmit a signal provided by the FEM 105 to another wireless communication device, such as a terminal or a base station, or may provide a signal received from another wireless communication device to the FEM 105. Moreover, the FEM 105 may be connected to the antenna 90, and may separate a transmission frequency from a reception frequency. That is, the FEM 105 may separate a signal provided by the RFIC 110 for each frequency band, and may provide the separated signal to the antenna 90 corresponding thereto. In addition, the FEM 105 may provide a signal provided by the antenna 90 to the RFIC 110.

[0123] As described above, the antenna 90 may transmit the frequency-separated signal to the outside, for example, the outside of a terminal such as the terminal 53 , or provide the FEM 105 with a signal received externally.

[0124] For reference, the antenna 90 may include, for example, an array antenna, but is not limited thereto. Moreover, the antenna 90 may be provided singly or in multiples. Therefore, in some embodiments, the terminal 53 may use multiple antennas to support phased arrays and multiple input multiple output (MIMO). However, for simplicity, Figure 6 An antenna 90 is shown.

[0125] The FEM 105 may include an antenna tuner. The antenna tuner may be connected to the antenna 90 and adjust the impedance of the antenna 90.

[0126] The RFIC 110 may perform up-conversion on a baseband signal received from the baseband circuit 120 and generate an RF signal. Also, the RFIC 110 may perform down-conversion on an RF signal received from the FEM 105 and generate a baseband signal.

[0127] Specifically, the RFIC 110 may include a transmit circuit 112 for an up-conversion operation, a receive circuit 114 for a down-conversion operation, and a local oscillator 116 .

[0128] For reference, the transmission circuit 112 may include a first analog baseband filter, a first mixer, and a power amplifier. Also, the reception circuit 114 may include a second analog baseband filter, a second mixer, and a low noise amplifier.

[0129] Here, the first analog baseband filter may filter the baseband signal received from the baseband circuit 120 and provide the filtered baseband signal to the first mixer. Also, the first mixer may perform up-conversion of converting the frequency of the baseband signal from a baseband to a high frequency band according to the frequency of the signal provided by the local oscillator 116. Due to the up-conversion, the baseband signal may be provided to the power amplifier as an RF signal, and the power amplifier may amplify the power of the RF signal and provide the power-amplified RF signal to the FEM 105.

[0130] The low noise amplifier may amplify the RF signal provided by the FEM 105 and provide the amplified RF signal to the second mixer. The second mixer may perform down-conversion of converting the frequency of the RF signal from a high frequency band to a baseband according to the frequency of the signal provided by the local oscillator 116. Due to the down-conversion, the RF signal may be provided as a baseband signal to the second analog baseband filter, and the second analog baseband filter may filter the baseband signal and provide the filtered baseband signal to the baseband circuit 120.

[0131] In addition, the baseband circuit 120 may receive a baseband signal from the RFIC 110 and process the baseband signal, or generate a baseband signal and provide the baseband signal to the RFIC 110 .

[0132] In addition, the baseband circuit 120 may include a controller 122 , a storage 124 , and a signal processing unit 125 .

[0133] Specifically, the controller 122 can control not only the overall operation of the baseband circuit 120, but also the overall operation of the RFIC 110. Moreover, 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 may be a part of a processor. More specifically, the controller 122 may include, for example, a central processing unit (CPU) and a digital signal processor (DSP).

[0134] The storage 124 may store basic programs, applications, and data, such as setting information, for the operation of the terminal 53. For example, the storage 124 may store instructions and / or data associated with the controller 122, the signal processing unit 125, or the RFIC 110.

[0135] In addition, the storage 124 may include various storage media. That is, the storage 124 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. For example, the storage 124 may include a random access memory (RAM) (e.g., a dynamic RAM (DRAM), a phase change RAM (PRAM), a magnetic RAM (MRAM), and a static RAM (SRAM)), and a flash memory (e.g., a NAND flash memory, a NOR flash memory, and a OneNAND flash memory).

[0136] In addition, the memory 124 may store various processor-executable instructions. The processor-executable instructions may be executed by the controller 122 .

[0137] The signal processing unit 125 may process a baseband signal received from the RFIC 110 .

[0138] Specifically, the signal processing unit 125 may include a demodulator 126 , a receiver filter and a cell searcher (RxFilter&cell searcher) 128 , and other components 130 .

[0139] First, the demodulator 126 may include a channel estimator, a data deallocation unit, an interference whitener, a symbol detector, a channel state information (CSI) generator, a mobility measurement unit, an automatic gain control unit, an automatic frequency control unit, a symbol timing recovery unit, a delay spread estimation unit and a time correlator, and perform the functions of each of the above components.

[0140] Here, the mobility measurement unit may be a unit configured to measure the signal quality of a serving cell and / or a neighboring cell to support mobility. The mobility measurement unit may measure a received signal strength indicator (RSSI), a reference signal received power (RSRP), a reference signal received quality (RSRQ), a reference signal (RS)-signal to interference plus (&) noise ratio (signal-to-interference-plus (&)-noise ratio, SINR) of a cell.

[0141] For reference, although not shown, the demodulator 126 may include a plurality of sub-demodulators configured to independently or jointly perform the above operations on de-spread signals or signals of various frequency bands in a second generation (2G) communication system, a third generation (3G) communication system, a fourth generation (4G) communication system, and a fifth generation (5G) communication system, respectively.

[0142] Thereafter, the receiver filter and cell searcher 128 may include a receiver filter (RxFilter), a cell searcher, a fast Fourier transform (FFT) unit, a time division duplex automatic gain control (TD-AGC) unit, and a time division duplex automatic frequency control (TD-AFC) unit.

[0143] Here, a receiver filter (RxFilter), which may also be referred to as a receiver (Rx) front end, may perform sampling, interference cancellation, and amplification on a baseband signal received from RFIC 110. Also, a cell detector may include a primary synchronization signal (PSS) detector and a secondary synchronization signal (SSS) detector, and may measure the amplitude and quality of a signal from a neighboring cell.

[0144] Additionally, other components 130 may include a symbol processor, a channel decoder, and an uplink processor.

[0145] Here, the symbol processor may perform channel deinterleaving, demultiplexing, and rate matching to decode the demodulated signal of each channel. Also, the channel decoder may decode the demodulated signal in units of code blocks.

[0146] For reference, the symbol processor and the channel decoder may include a hybrid automatic repeat request (HARQ) processing unit, a turbo decoder, a cyclic redundancy check (CRC) checker, a Viterbi decoder, and a turbo encoder.

[0147] The uplink processor, which is a processor configured to generate a transmission baseband signal, may include a signal generator, a signal distributor, an inverse fast Fourier transform (IFFT) unit, a discrete Fourier transform (DFT) unit, and a transmitter (Tx) front end.

[0148] Here, 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.

[0149] For reference, other components 130 may also include a sidelink processor. The sidelink processor may generate a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and a physical sidelink feedback channel (PSFCH). In another case, the sidelink processor may not be provided separately, but may be integrated with the uplink processor into one processor. However, for simplicity, the example embodiments relate to an example in which the sidelink processor is provided separately from the uplink processor.

[0150] The signal processing unit 125 may have the above-described configuration and features. However, the respective configurations or functions of the demodulator 126, the receiver filter and the cell searcher 128, and the other components 130 in the signal processing unit 125 may be changed. For example, the channel estimator in the demodulator 126 may be included in the receiver filter and the cell searcher 128 or the other components 130, and the FFT unit in the receiver filter and the cell searcher 128 may be included in the demodulator 126 or the other components 130. Moreover, the channel decoder in the other components 130 may be included in the demodulator 126 or the receiver filter and the cell searcher 128. However, for the sake of simplicity, the example embodiments relate to an example in which the respective configurations or functions of the demodulator 126, the receiver filter and the cell searcher 128, and the other components 130 in the signal processing unit 125 are implemented as above.

[0151] As mentioned above, Figure 6 The case where the baseband circuit 120 includes a controller 122 , a storage 124 , and a signal processing unit 125 is shown.

[0152] However, at least two of the controller 122, the storage 124, and the signal processing unit 125 may be integrated into one component in the baseband circuit 120. In addition, the baseband circuit 120 may further include other components in addition to the above components, or may not include some components. In addition, the signal processing unit 125 may further include other components in addition to the above components, or may not include some components.

[0153] However, for the sake of brevity, the example embodiments relate to an example in which the baseband circuit 120 includes the above-described components.

[0154] Furthermore, 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 respectively different devices, for example, in a distributed architecture.

[0155] With the above configuration Figure 6 The RF transceiver components may be included in e.g. Figure 2 One or more of the terminal 53 or the terminal 55 or the base station 51.

[0156] RFIC 110 and baseband circuit 120 may include Figure 6 The components shown are well known to those skilled in the art. In addition, these components can be implemented in a known manner by using hardware, firmware, software logic or a combination thereof.

[0157] However, Figure 6Only an example of an RF transceiver assembly is shown, and the embodiment is not limited thereto. Figure 6 Make various changes in the , such as adding or removing components.

[0158] Figure 7 Shows Figure 6 An example in which the configuration of the RF transceiver component is partially changed (eg, simplified).

[0159] Specifically, the terminal 53 may include a processor 150 , a transceiver 160 , a memory 170 , and an antenna 180 .

[0160] The processor 150 may control the overall operation of the transceiver 160, and may write data to or read data from the memory 170. That is, the processor 150 may be, for example, a processor including Figure 6 Functional components of the controller 122.

[0161] The transceiver 160 can transmit and receive wireless signals and is controlled by the processor 150. That is, the transceiver 160 can be, for example, a Figure 6 The components of the functions of the FEM 105, the RFIC 110 and the signal processing unit 125.

[0162] The memory 170 may include basic programs, applications, and data for the operation of the terminal 53, such as setting information. Therefore, the memory 170 may store instructions and / or data associated with the processor 150 and the transceiver 160. That is, the memory 170 may be, for example, a computer including Figure 6 Functional components of the storage 124 .

[0163] The antenna 180 may be connected to the transceiver 160, and may transmit a signal provided by the transceiver 160 to another wireless communication device, such as a terminal or a base station, or may provide a signal received from another wireless communication device to the transceiver 160. That is, the antenna 180 may be, for example, a Figure 6 The antenna 90 is a functional component.

[0164] Since the terminal 53 or the terminal 55 or the base station 51 has the above-described features and configurations in the exemplary embodiment, reference will now be made to Figure 8 An example of processing of signaling between the terminal 53 or the terminal 55 and the base station 51 to enable V2X communication is described in detail.

[0165] Figure 8 According to the embodiment Figure 2 Flow chart of signaling processing performed between terminal 53 or terminal 55 and base station 51.

[0166] For reference, refer to Figure 2 and Figure 7 describe Figure 8 .

[0167] Reference Figure 8 In order to enable effective PSFCH transceiver operations in V2X communications, signaling may be sent between a terminal 53 , which may be a transmitting terminal, and a base station 51 .

[0168] First, at operation S100, in order to enable efficient PSFCH transceiver operation, the terminal 53 may signal the maximum number of PSFCHs that may be received during one TTI to the base station 51. In an embodiment, the maximum number of PSFCHs that may be received during one TTI may be referred to as the highest PSFCH reception capability F or the maximum PSFCH reception capability F.

[0169] Specifically, the processor 150 may control the transceiver 160 to signal the maximum PSFCH reception capability F to the base station 51 .

[0170] Here, TTI may include a time slot, and the maximum PSFCH reception capability F may include the number of PSFCHs received in at least one of multicast and unicast. That is, the maximum PSFCH reception capability F may include the total number of PSFCHs received in each of multicast and unicast, or may include only the number of PSFCHs received in multicast or unicast. Therefore, the maximum PSFCH reception capability F may be, for example, any one of 10, 20, 30, 40, 50, 100, 200, 300, and 410.

[0171] At operation S150, when the base station 51 receives a signal about information on the maximum PSFCH reception capability F from the terminal 53, the base station 51 may set the sidelink communication of the terminal 53 to satisfy the following inequality: F≥L×M×N.

[0172] 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 multicast during each time slot. In addition, M may refer to the number of receiving terminals (e.g., a group of terminals for multicast) included in the same group as transmitting terminals, and N may refer to the PSFCH reception period.

[0173] That is, to enable efficient PSFCH transceiving operations, base station 51 may determine values ​​L, M, and N associated with terminal 53 considering the highest PSFCH reception capability F. In addition, base station 51 may also consider the following method in multicast mode to satisfy the above inequality.

[0174] 1) When the inequality F < L × M × N related to the receiving terminals included in the group is satisfied, the base station 51 may determine that, among the receiving terminals included in the same group as the transmitting terminal, the "NACK-based HARQ" that receives only one common PSFCH from each receiving terminal corresponding to NACK is the HARQ scheme. In this case, the value of M may be 1.

[0175] 2) When the inequality F ≥ L × M × N related to the receiving terminals included in the group is satisfied, the base station 51 may determine the "ACK / NACK-based HARQ" in which the transmitting terminal receives the PSFCH from each of all the receiving terminals included in the same group as the transmitting terminal as the HARQ scheme.

[0176] 3) To satisfy the inequality F ≥ L × M × N, the base station 51 may determine the size of the area, which is the range of the area set by the base station 51 to enable multicast. For example, when the terminals included in the group have a high value of F, the base station 51 may set the area to a larger size; conversely, when the terminals included in the group have a low value of F, the base station 51 may set the area to a smaller size. As a reference, the number of terminals included in the group may be determined based on the size of the area.

[0177] 4) When determining the group leader configured to perform multicast among the terminals included in the group, the base station 51 may select a terminal having a value of F that satisfies the inequality F ≥ L × M × N as the group leader. When multiple terminals satisfy the above conditions, the base station 51 may select the terminal with the best channel state as the group leader.

[0178] In addition, at operation S200, in order to enable an effective PSFCH transceiver operation, the terminal 53 may signal to the base station 51 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 the highest PSFCH transmission capacity R or the maximum PSFCH transmission capacity R.

[0179] Specifically, the processor 150 may control the transceiver 160 to signal the maximum PSFCH transmission capacity R to the base station 51.

[0180] Here, the TTI may include time slots, and the maximum PSFCH transmission capacity R may include the number of PSFCHs transmitted in at least one of multicast and unicast. That is, the maximum PSFCH transmission capacity R may include the total number of PSFCHs transmitted in each of multicast and unicast, or may include only the number of PSFCHs transmitted in multicast or unicast. Therefore, the maximum PSFCH transmission capacity R may be any one of, for example, 1, 2, 3, 4, 5, 10, 20, 30, and 68.

[0181] For reference, operation S200 may be performed before operation S100, or operation S100 and operation S200 may be performed simultaneously. In addition, terminal 53 may perform only one of operation S100 and operation S200, and base station 51 may perform only a specific operation S150 or operation S250 according to the operation performed by terminal 53, or perform only a part of operation S150 or operation S250. However, for simplicity, the exemplary embodiment relates to an example in which operation S200 is performed after operation S100 and terminal 53 performs both operation S100 and operation S200.

[0182] When the base station 51 receives signaling information about the maximum PSFCH transmission capability R from the terminal 53, at operation S250, the base station 51 may set up the sidelink communication of the terminal 53 to satisfy the following inequality: U+G≥R.

[0183] For reference, U may refer to the number of PSSCHs received in unicast during one slot, and G may refer to the number of PSSCHs received in groupcast during one slot. In addition, R may refer to the maximum number of PSFCHs that can be transmitted during one slot.

[0184] That is, in order to enable efficient PSFCH transceiver operation, the base station 51 can determine the unicast and / or multicast to which the terminal 53 can belong by considering the maximum PSFCH transmission capacity R based on the inequality U+G≥R. In addition, in order to satisfy the above inequality, the base station 51 can prioritize unicast and multicast, and determine R receiving channels (e.g., R receiving channels that can be received in unicast and multicast) as the receiving channels of the terminal 53 according to the order of higher priority.

[0185] As described above, due to the above process, at operation S300, the base station 51 can perform RRC signaling for the terminal 53 based on the signaling 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 setting operation related to multicast, for example, selecting a group leader in the group and setting the size of the area used for multicast.

[0186] As described above, signaling can be sent between the terminal 53 and the base station 51 to enable effective PSFCH transceiver operation in V2X communication. Fig. 9 and Fig.10 An example of a PSFCH determination method of a terminal in V2X communication according to an example embodiment is described.

[0187] Fig. 9 is a flowchart of a PSFCH determination method of a terminal according to an exemplary embodiment. Fig.10According to an example embodiment Fig. 9 Detailed flowchart of operation S1200 and operation S1300.

[0188] For reference, refer to Figure 2 and Figure 7 describe Fig. 9 and Fig.10 .

[0189] refer to Fig. 9 First, at operation S1000, k PSFCHs (where k is an integer greater than 1) may be selected from all PSFCHs received during one TTI, and RSRP or SINR of the selected k PSFCHs may be measured.

[0190] Specifically, the processor 150 may select k PSFCHs from all PSFCHs based on a preset specific criterion or randomly. Moreover, the processor 150 may control the transceiver 160 to sequentially measure the RSRP or SINR (where k is an integer greater than 1) of k PSFCHs among all PSFCHs received during one TTI.

[0191] For reference, after selecting all k PSFCHs, the processor 150 may control the transceiver 160 to sequentially measure the RSRP or SINR of 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.

[0192] Here, k may be preset by the manufacturer or user of the terminal 53 based on at least one of the channel state of the terminal 53, the performance of the terminal 53, and the total number of PSFCHs. Figure 8 When the base station 51 in the base station 51 sets the side link, the terminal 53 can be guided to set k to any value within a specific range.

[0193] When RSRP or SINR of the selected k PSFCHs are sequentially measured, the k PSFCHs may be sorted in ascending order based on the measured RSRP or SINR at operation S1100.

[0194] Specifically, the processor 150 may sort the k PSFCHs in ascending order based on the RSRP or SINR of the k PSFCHs measured by the transceiver 160. When the ascending order of the k PSFCHs is completed, at operation S1200, it may be sequentially determined whether the k PSFCHs sorted in ascending order are HARQ ACK or HARQ NACK, and at operation S1300, it may be determined whether to retransmit the PSSCH based on the determination result.

[0195] Specifically, the processor 150 may control the transceiver 160 to sequentially determine whether the k PSFCHs sorted in ascending order are HARQ ACK or HARQ NACK. Also, the processor 150 may determine whether to retransmit the PSSCH based on the determination result.

[0196] For reference, the HARQ ACK / NACK determination operation may be performed by a channel decoder (eg, Figure 6 The method may be executed by a channel decoder included in other components 130 of the present invention.

[0197] Fig.10 Examples of operation S1200 and operation S1300 according to the embodiment are specifically illustrated.

[0198] Specifically, refer to Fig.10 Operation S1200 may start at operation S1210 of determining whether an m-th PSFCH (where 1≤m (integer)≤k) among the sorted k PSFCHs is a HARQ ACK or a HARQ NACK.

[0199] Therefore, if it is determined at operation S1220 that the m-th PSFCH (where 1≤m(integer)≤k) among the sorted k PSFCHs is HARQ ACK, it may be determined at operation S1320 whether m is less than k. Based on the determination result of operation S1320, a HARQ ACK / NACK determination operation may be performed on the m+1-th PSFCH to the k-th PSFCH among the sorted k PSFCHs (returning to operation S1210), or the HARQ ACK / NACK determination operation for the sorted k PSFCHs may end (advancing to operations S1330 to S1350).

[0200] For example, when m is less than k, for example, when there is at least one PSFCH among the sorted k PSFCHs on which the HARQ ACK / NACK determination operation is not performed, the HARQ ACK / NACK determination operation can be performed sequentially on the m+1th PSFCH to the kth PSFCH at operation S1210.

[0201] Otherwise, when m is equal to k, for example, when the HARQ ACK / NACK determination operation of the sorted k PSFCHs is completely performed, the HARQ ACK / NACK determination operation of the sorted k PSFCHs can be ended, and it can be determined whether to continue the RSRP or SINR measurement operation of the next k PSFCHs by proceeding to operation S1330 to operation S1350 according to whether there is at least one PSFCH among all PSFCHs for which the HARQ ACK / NACK determination operation is not performed.

[0202] Specifically, at operation S1330, when there is at least one PSFCH on which the HARQ ACK / NACK determination operation is not performed among all PSFCHs, the measurement operation of RSRP or SINR of the next k PSFCHs may be continued at operation S1340. In this case, the above operations S1100 to S1300 may be sequentially performed on the next k PSFCHs. Otherwise, at operation S1330, when there is no PSFCH on which the HARQ ACK / NACK determination operation is not performed among all PSFCHs, at operation S1350, the HARQ ACK / NACK determination operation on all PSFCHs may be ended.

[0203] In addition, at operation S1220, when it is determined that the mth (where 1≤m (integer)≤k) PSFCH among the sorted k PSFCHs is HARQ NACK, the HARQ ACK / NACK determination operation of the m+1th PSFCH to the kth PSFCH among the sorted k PSFCHs can be interrupted, and it is determined to retransmit the PSSCH at operation S1310.

[0204] For reference, if it is determined that the PSSCH is to be retransmitted, all PSSCHs, for example, all PSSCHs corresponding to all PSFCHs, may be retransmitted. In addition, the above operations S1210 to S1350 may be performed by the processor 150 and the transceiver 160 .

[0205] Specifically, according to an exemplary embodiment, in the PSFCH determination method of the terminal 53, after completing the measurement of the RSRP or SINR of the selected k PSFCHs (refer to operation S1000), new k PSFCHs may not be selected again from the remaining PSFCHs, but before selecting new k PSFCHs, subsequent processing operations, such as ACK / NACK determination operations, may be performed on the k PSFCHs selected in operation S1000. Therefore, compared with the case where it is immediately determined whether all PSFCHs are ACK or NACK, the complexity of the ACK / NACK determination operation can be reduced, and the processing time and memory required for the ACK / NACK determination operation can be reduced. In addition, because the PSFCH with low RSRP or SINR among the selected k PSFCHs is first determined as ACK or NACK, NACK can be quickly determined.

[0206] As described above, the PSFCH determination method of the terminal according to the exemplary embodiment can be performed. Fig.11 and Fig.12 An example of a PSFCH determination method of a terminal according to another exemplary embodiment is described.

[0207] Fig.11 is a flowchart of a PSFCH determination method of a terminal according to an exemplary embodiment. Fig.12 yes Fig.11 Detailed flowchart of operation S2000.

[0208] For reference, refer to Figure 2 and Figure 7 describe Fig.11 and Fig.12 .

[0209] Reference 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 the PSFCHs whose RSRP or SINR is measured. Here, k may be an integer greater than 1.

[0210] Specifically, the processor 150 may control the transceiver 160 to sequentially measure the RSRP or SINR of all PSFCHs received during one TTI. When the number of PSFCHs satisfying the preset criteria among the PSFCHs whose RSRP or SINR is measured reaches k, the selection operation (eg, operation S2000) may end.

[0211] Fig.12 An example of operation S2000 is specifically shown.

[0212] Specifically, refer to Fig.12 Operation S2000 may start from operation S2010 of measuring the RSRP or SINR of the nth PSFCH (where n is a positive integer less than the total number of PSFCHs).

[0213] Therefore, at operation S2010, when the RSRP or SINR of the nth PSFCH (where n is a positive integer less than the total number of PSFCHs) is measured, it can be determined at operation S2020 whether the nth PSFCH meets a preset standard.

[0214] If it is determined that the nth PSFCH meets the preset criterion, then at operation S2030, the cumulative count of the PSFCHs meeting the preset criterion may be increased by 1. At operation S2040, when the cumulative count increased by 1 (eg, the number of PSFCHs meeting the preset criterion) is equal to k, the operation may be performed. Fig.11 When the cumulative count increased by 1 (eg, the number of PSFCHs satisfying a preset criterion) is less than k, operation S2010 of measuring the RSRP or SINR of the next PSFCH (eg, the n+1th PSFCH) may be performed.

[0215] Even when it is determined that the nth PSFCH does not satisfy the preset criterion, operation S2010 of measuring the RSRP or SINR of the next PSFCH (eg, the (n+1)th PSFCH) may be performed.

[0216] For reference, there may be various standards, and a method of selecting k PSFCHs based on each standard may be as follows.

[0217] 1) When k PSFCHs with RSRP or SINR less than a preset reference value among all PSFCHs are accumulated, the selection operation can be ended. Specifically, the HARQ ACK / NACK determination operation can be performed on the PSFCH with RSRP or SINR less than the preset reference value, while the HARQ ACK / NACK determination operation may not be performed on the PSFCH with RSRP or SINR greater than or equal to the preset reference value. The results of the determination operation on some PSFCHs can be considered to represent the determination operation on all PSFCHs. According to the present method, the data rate can be increased by utilizing the fact that when the channel state of the receiving terminal is better than a specific threshold, the PSFCH feedback is less likely to be NACK.

[0218] 2) When k PSFCHs with RSRP or SINR greater than a preset reference value among all PSFCHs are accumulated, the selection operation can be ended. Specifically, the HARQ ACK / NACK determination operation can be performed on the PSFCH with RSRP or SINR greater than the preset reference value, while the HARQ ACK / NACK determination operation may not be performed on the PSFCH with RSRP or SINR less than or equal to the preset reference value. The results of the determination operation on some PSFCHs can be considered to represent the determination operation on all PSFCHs. According to the present method, the data rate can be increased by utilizing the fact that when the channel state of the receiving terminal is worse than a specific threshold, the PSFCH feedback is likely to be NACK.

[0219] 3) When k PSFCHs among all PSFCHs having RSRP or SINR greater than the first reference value and less than the second reference value are accumulated, the selection operation can end. 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 PSFCHs having RSRP or SINR greater than the first reference value and less than the second reference value. The result of the determination operation on some PSFCHs may be considered to represent the determination operation on all PSFCHs. According to the present method, the data rate may be increased by using the above two methods.

[0220] Here, each of k and the reference value may be preset by the manufacturer or user of the terminal 53 based on at least one of the channel state of the terminal 53, the performance of the terminal 53, and the total number of PSFCHs. Figure 8 When the base station 51 in the base station 51 sets the side link, the terminal 53 can be guided to set k to any value within a specific range.

[0221] Return to reference Fig.11 , when k PSFCHs are selected at operation S2000 , at operation S2100 , the selected k PSFCHs may be sorted in ascending order based on the measured RSRP or SINR.

[0222] Specifically, the processor 150 may sort the k PSFCHs in ascending order based on the RSRP or SINR of each PSFCH measured by the transceiver 160 .

[0223] When sorting of the k PSFCHs in ascending order is completed, at operation S2200, it may be sequentially determined whether the k PSFCHs sorted in ascending order are HARQ ACK or HARQ NACK, and at operation S2300, it may be determined whether to retransmit the PSSCH based on the determination result.

[0224] For reference, since operations S2100 to S2300 may correspond to the above reference Fig. 9 and Fig.10 Operations S1100 to S1300 are described in detail, so their detailed descriptions are omitted.

[0225] As described above, according to the exemplary embodiment, a PSFCH determination method of a terminal may be performed. Fig.13 A wireless communication device implemented according to an embodiment is described.

[0226] Fig.13 is a block diagram of a wireless communication device 201 according to an embodiment.

[0227] For reference, Fig.13 The wireless communication device 201 can be applied to a base station, for example Figure 2 Base station 51 in; eNB, gNB and access point (AP), or terminal, such as Figure 2 Terminal 53 or terminal 55 in; STA, MS and UE implemented according to the embodiment. In addition, in some embodiments, Fig.13 The wireless communication device 201 may operate in a standalone (SA) mode or may operate in a non-standalone (NSA) mode.

[0228] Specifically, Fig.13 A wireless communication device 201 implemented in a network environment 200 is shown in FIG.

[0229] 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 components, or may further include at least one other component. However, for the sake of brevity, the exemplary embodiments relate to an example in which the wireless communication device 201 includes the above components.

[0230] The bus 210 may 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, signals, such as control messages and / or data, may be exchanged and transmitted between the processor 220, the memory 230, the I / O interface 250, the display module 260, and the communication interface 270 through the bus 210.

[0231] 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 include Figure 7 Functional components of the processor 150 .

[0232] The memory 230 may include volatile memory and / or non-volatile memory. In addition, the memory 230 may store commands or instructions or data associated with other components in the wireless communication device 201.

[0233] Additionally, the memory 230 may store software and / or programs 240. The programs 240 may include, for example, a kernel 241, middleware 243, an application programming interface (API) 245, an application program 247 (also referred to as an "application"), and network access information 249.

[0234] For reference, at least some of the kernel 241, the middleware 243, and the API 245 may be referred to as an operating system (OS). Also, in an embodiment, the memory 230 may be a memory including Figure 7 The functional components of the memory 170 .

[0235] For example, the I / O interface 250 may transmit a command 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 may output a command or data received from other components of the wireless communication device 201 to the user or another external device.

[0236] The display module 260 may include, for example, a liquid crystal display (LCD), a light emitting diode (LED) display, an organic LED (OLED) display, a micro-electromechanical system (MEMS) display, or an electronic paper display.

[0237] In addition, the display module 260 can display various contents such as text, images, videos, icons or symbols to the user. The display module 260 may include a touch screen and may receive a touch, gesture, proximity or hovering input by using, for example, an electronic pen or a body part of the user.

[0238] The communication interface 270 may set up communication between the wireless communication device 201 and an external device (e.g., the electronic device 202 and the electronic device 204 or the server 206). For example, the communication interface 270 may be connected to the network 262 via wireless communication or wired communication, and may communicate with the external device (e.g., the electronic device 204 or the server 206). In addition, the communication interface 270 may communicate with the external device (e.g., the electronic device 202) via wireless communication 264. In addition, the communication interface 270 may include Figure 7 Functional components of the transceiver 160 .

[0239] For reference, the wireless communication 264 may be a cellular communication protocol, and may use, for example, at least one of NR, LTE, LTE-A, CDMA, WCDMA, Universal Mobile Telecommunications System (UMTS), Wireless Broadband (WiBro), and GSM. In addition, the wired communication may include, for example, at least one of Universal Serial Bus (USB), High Definition Multimedia Interface (HDMI), Recommended Standard 232 (RS-232), and Plain Old Telephone Service (POTS).

[0240] Furthermore, the network 262 as a telecommunication network may include, for example, at least one of a computer network (eg, a local area network (LAN) or a wide area network (WAN)), the Internet, and a telephone network.

[0241] Furthermore, each of the electronic device 202 and the electronic device 204 as external devices may be of the same type or a different type as the wireless communication device 201. Also, the server 206 may include a group of at least one server.

[0242] For reference, all or some operations performed by the wireless communication device 201 may be performed by other external devices, for example, the electronic device 202 and the electronic device 204 or the server 206 .

[0243] In addition, when the wireless communication device 201 needs to perform a function or service automatically or by request, the wireless communication device 201 can perform the function or service by itself, or can request other external devices (e.g., the electronic device 202 and the electronic device 204 or the server 206) to perform part of the function or service. In addition, other external devices (e.g., the electronic device 202 and the electronic device 204 or the server 206) can perform the requested function or service, and can send the result to the wireless communication device 201. In this case, the wireless communication device 201 can perform the function or service based on the received result or by performing additional processing on the received result.

[0244] For the above mechanism, for example, cloud computing technology, distributed computing technology, or client server computing technology may be applied to the wireless communication device 201 .

[0245] According to the above embodiments, the excess of PSFCH receiving capacity and the overload of the operation of determining whether PSFCH is ACK or NACK can be solved by sending signaling for the maximum PSFCH transceiving capacity and using an effective ACK / NACK determination method for PSFCH. Therefore, the performance and operation efficiency of the terminal can be improved.

[0246] While embodiments have been particularly shown and described, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the appended claims.

Claims

1. A terminal configured to perform communication between a vehicle and the outside world, the terminal comprising: a transceiver configured to transmit and receive one or more wireless signals; as well as a processor configured to control the transceiver to send a signaling for a maximum physical sidelink feedback channel receiving capability to a base station, The maximum physical side link feedback channel receiving capacity is the maximum number of physical side link feedback channels that can be received during a transmission time interval.

2. The terminal according to claim 1, wherein: The maximum physical side link feedback channel reception capability is any one of 10, 20, 30, 40, 50, 100, 200, 300 and 410.

3. The terminal according to claim 1, wherein: The maximum physical sidelink feedback channel reception capability includes the number of physical sidelink feedback channels received in at least one of multicast and unicast.

4. The terminal according to claim 1, wherein: The transmission time interval comprises a time slot.

5. A terminal configured to perform communication between a vehicle and the outside world, the terminal comprising: a transceiver configured to transmit and receive one or more wireless signals; as well as a processor configured to control the transceiver to send a signaling for a maximum physical sidelink feedback channel transmission capability to a base station, The maximum physical side link feedback channel transmission capacity is the maximum number of physical side link feedback channels that can be transmitted during a transmission time interval. The terminal according to claim 5, wherein: The maximum physical sidelink feedback channel transmission capacity is one of 1, 2, 3, 4, 5, 10, 20, 30 and 68.

7. The terminal according to claim 5, wherein: The maximum physical sidelink feedback channel transmission capability includes the number of physical sidelink feedback channels transmitted in at least one of multicast and unicast.

8. A method for operating a terminal in a wireless communication system, wherein the terminal is configured to perform vehicle-to-external communication, the method comprising: A physical side link feedback channel capability is signaled to a base station, wherein the physical side link feedback channel capability is a maximum number of physical side link feedback channels that can be processed during a transmission time interval.

9. The operating method according to claim 8, wherein: The physical side link feedback channel capability includes a maximum physical side link feedback channel receiving capability for the base station, and The maximum number of the physical side link feedback channels that can be processed during the transmission time interval includes the maximum number of the physical side link feedback channels that can be received during the transmission time interval.

10. The operating method according to claim 9, wherein: The maximum number of the physical sidelink feedback channels that can be received during the transmission time interval is any one of 10, 20, 30, 40, 50, 100, 200, 300 and 410.

11. The operating method according to claim 9, wherein: The maximum physical sidelink feedback channel reception capability includes the number of physical sidelink feedback channels received in at least one of multicast and unicast.

12. The operating method according to claim 8, wherein: The physical side link feedback channel capability includes a maximum physical side link feedback channel transmission capability to the base station, and The maximum number of the physical side link feedback channels that can be processed during the transmission time interval includes the maximum number of the physical side link feedback channels that can be sent during the transmission time interval.

13. The operating method according to claim 12, wherein: The maximum number of the physical sidelink feedback channels that can be sent during the transmission time interval is one of 1, 2, 3, 4, 5, 10, 20, 30 and 68.

14. The operating method according to claim 12, wherein: The maximum physical sidelink feedback channel transmission capability includes the number of physical sidelink feedback channels transmitted in at least one of multicast and unicast.

15. The operating method according to claim 8, wherein: The transmission time interval is a time slot.

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