Direct communication method using multiple feedback occasions, and user equipment therefor

Abstract

The present document relates to a direct communication method using multiple feedback occasions, and a user equipment (UE) therefor. To this end, the direct communication method for a first UE comprises: transmitting a first direct communication data channel to a second UE; and receiving first feedback information for the first direct communication data channel from the second UE through a physical layer feedback channel, wherein reception of the first feedback information includes monitoring the first feedback information in multiple physical layer feedback channel occasions.

Description

Direct communication method using multiple feedback periods and user device therefor

[0001] The following description relates to direct communication between user equipment (UE), and more specifically, to a direct communication method using multiple feedback occasions and a UE for the same.

[0002] Wireless communication systems utilize various technologies, including LTE, LTE-Advanced, and WiFi, and 5G is included. The three main usage scenarios for 5G include (1) Enhanced Mobile Broadband (eMBB), (2) Massive Machine Type Communication (mMTC), and (3) Ultra-reliable and Low Latency Communications (URLLC). Some use cases may require optimization across multiple areas, while others may focus on just a single Key Performance Indicator (KPI). 5G supports these diverse use cases in a flexible and reliable manner.

[0003] Figure 1 shows the structure of a system for 5G communication.

[0004] Referring to FIG. 1, a Next Generation - Radio Access Network (NG-RAN) may include a base station (20) that provides user plane and control plane protocol termination to a UE (10). For example, the base station (20) may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE (10) may be fixed or mobile, and may be referred to by other terms such as a terminal, a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the base station may be a fixed station that communicates with the UE (10), and may be referred to by other terms such as a base transceiver system (BTS), an access point, etc.

[0005] The example of Fig. 1 illustrates a case that includes only gNB. The base stations (20) can be connected to each other via Xn interfaces. The base stations (20) can be connected to a 5th generation core network (5G Core Network: 5GC) via an NG interface. More specifically, the base station (20) can be connected to an access and mobility management function (AMF) (30) via an NG-C interface, and can be connected to a user plane function (UPF) (30) via an NG-U interface.

[0006] In the 5G communication system described above, the UE (10) performs beam management by transmitting feedback information through UCI (Uplink Control Information) transmitted through PUCCH (Physical Uplink Control Channel) and / or PUSCH (Physical Uplink Shared Channel) for a beam transmitted by the base station (20). The UCI information transmitted through the uplink may include a rank indicator (RI), a layer indicator, a CQI (Channel Quality Indicator), a CRI (CSI-RS Resource Indicator), etc., as shown in [Table 1] below.

[0007] [Table 1]

[0008] [Correction pursuant to Rule 91, January 15, 2025]

[0009] In the above [Table 1] K s CSI-RS is a variable indicating the number of CSI-RS resources in the corresponding resource set. This UCI can transmit tens to hundreds of bits of information, and beam management is performed through it.

[0010] Meanwhile, in the system for 5G communication as described above, UEs (10) can be connected through a PC5 interface, and a link through PC5 can be referred to as a sidelink.

[0011] In a 5G communication system, a receiving UE (Rx UE) that receives transmission data from a transmitting UE (Tx UE) can transmit feedback on the data through a PSFCH (Physical Sidelink Feedback Channel).

[0012] However, the transmission resources of PSFCH are limited, and feedback information exceeding the information that the Rx UE can transmit in one PSFCH occasion must be transmitted in the next PSFCH occasion, which may cause delay, and this may cause an even more serious problem when transmitting and receiving between multiple UEs using multiple beams.

[0013] The technology proposed below is assumed to be applicable not only to the current 5G system but also to 6G and subsequent mobile communication systems. Therefore, the term 'sidelink' used in 5G can be referred to as a 'direct communication link' between UEs, and terms such as PSSCH (Physical Sidelink Shared Channel) and PSFCH corresponding to the data channel used in 5G can be referred to as 'direct communication data channel', 'physical layer feedback channel', etc. In this case, the 'physical layer feedback channel' refers to a physical layer channel used for HARQ feedback transmission between UEs, and can be used to distinguish it from a feedback channel through a MAC (Medium Access Control) CE (Control Element) through which feedback information for beam management is transmitted in parallel.

[0014] In order to solve the above-described problem, one aspect of the present invention proposes a direct communication method using multiple feedback periods and a UE therefor.

[0015] Specifically, we propose a method and a UE for configuring a physical layer feedback channel timing at a resource location associated with a direct communication data channel, and using multiple physical layer feedback channel timings to secure a transmission space for feedback information that can be transmitted by a UE.

[0016] In addition, according to an embodiment of the present invention, when a UE performs transmission and reception simultaneously with a plurality of UEs, a method for performing HARQ collision avoidance using a plurality of physical layer feedback channel timings and a UE for the same are proposed.

[0017] The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0018] In one aspect of the present invention for solving the above-described problem, a method for performing direct communication between a first user equipment (UE) and a second UE in a mobile communication system is proposed, the method comprising: transmitting a first direct communication data channel to the second UE; and receiving first feedback information for the first direct communication data channel from the second UE through a physical layer feedback channel, wherein receiving the first feedback information includes monitoring the first feedback information at a plurality of physical layer feedback channel occasions.

[0019] Monitoring the first feedback information may include monitoring the first feedback information at a first time period among the plurality of physical layer feedback channels, and if the first feedback information is not received at the first time period, monitoring the first feedback information at a second time period.

[0020] In addition, the method further includes receiving a second direct communication data channel from a third UE; and transmitting second feedback information for the second direct communication data channel to the third UE via the physical layer feedback channel, wherein, if the first feedback information is monitored via one of the plurality of physical layer feedback channel occasions, the second feedback information may be transmitted via another one of the plurality of physical layer feedback channel occasions.

[0021] The above multiple physical layer feedback channel periods may transmit the physical layer feedback channel through different beams.

[0022] It is preferable that the above multiple physical layer feedback channel periods be specified in different time units.

[0023] According to an embodiment, the first direct communication data channel may correspond to a PSSCH (Physical Sidelink Shared Channel), and the physical layer feedback channel may correspond to a PSFCH (Physical Sidelink Feedback Channel).

[0024] Meanwhile, in another aspect of the present invention for solving the above-described problem, a method for performing direct communication between a second user equipment (UE) and a first UE in a mobile communication system is proposed, the method comprising: receiving a first direct communication data channel from the first UE; and transmitting first feedback information for the first direct communication data channel to the first UE through a physical layer feedback channel, wherein transmitting the first feedback information comprises transmitting the first feedback information through one of a plurality of physical layer feedback channel occasions.

[0025] Additionally, the method further comprises receiving a second direct communication data channel from a third UE; and transmitting second feedback information for the second direct communication data channel to the third UE via the physical layer feedback channel, wherein the second feedback information may be transmitted via any other one of the plurality of physical layer feedback channel periods.

[0026] The above multiple physical layer feedback channel periods may transmit the physical layer feedback channel through different beams.

[0027] It is preferable that the above multiple physical layer feedback channel periods be specified in different time units.

[0028] According to an embodiment, the first direct communication data channel may correspond to a PSSCH (Physical Sidelink Shared Channel), and the physical layer feedback channel may correspond to a PSFCH (Physical Sidelink Feedback Channel).

[0029] Meanwhile, in another aspect of the present invention for solving the above-described problem, a first user equipment (UE) for performing direct communication with a second user equipment (UE) in a mobile communication system is proposed, comprising: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, wherein the operations include transmitting a first direct communication data channel to the second UE; and receiving first feedback information for the first direct communication data channel from the second UE through a physical layer feedback channel, wherein receiving the first feedback information includes monitoring the first feedback information at a plurality of physical layer feedback channel occasions.

[0030] Meanwhile, in another aspect of the present invention, a second user equipment (UE) performing direct communication with a first user equipment (UE) in a mobile communication system is provided, comprising: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, wherein the operations include receiving a first direct communication data channel from the first UE; and transmitting first feedback information for the first direct communication data channel to the first UE via a physical layer feedback channel, wherein transmitting the first feedback information includes transmitting the first feedback information via one of a plurality of physical layer feedback channel occasions.

[0031] According to the embodiments of the present invention as described above, communication delay due to feedback delay of the UE can be effectively prevented through a direct communication method using multiple feedback periods.

[0032] In addition, according to an embodiment of the present invention, when a UE performs transmission and reception simultaneously with multiple UEs, HARQ collision avoidance and multi-beam management can be efficiently performed using multiple physical layer feedback channel timings.

[0033] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0034] Figure 1 shows the structure of a system for 5G communication.

[0035] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0036] FIG. 3 is a diagram for explaining a direct communication method between UEs using multiple feedback periods according to one embodiment of the present invention.

[0037] Figure 4 is a drawing showing an example of applying the method of Figure 3 to a 5G system.

[0038] FIG. 5 is a diagram for explaining a case in which a specific UE must simultaneously transmit and receive a physical layer feedback channel according to one embodiment of the present invention.

[0039] FIGS. 6 and 7 are drawings for explaining a method for avoiding a beam collision situation according to another embodiment of the present invention.

[0040] Figure 8 illustrates a wireless device to which the present technology can be applied.

[0041] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts irrelevant to the description have been omitted to clearly explain the present invention, and similar parts have been designated with similar reference numerals throughout the specification.

[0042] Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0043]

[0044] As described above, one aspect of the present invention proposes a direct communication method utilizing multiple feedback periods and a UE for this purpose. To this end, we first examine in detail the channels available for sidelink communication in 5G mobile communication systems.

[0045] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0046] The embodiment of FIG. 2 can be combined with various embodiments of the present invention. In various embodiments of the present invention, the "transmission mode" may be referred to as a "mode" or a "resource allocation mode." Hereinafter, for convenience of explanation, the transmission mode in LTE may be referred to as the LTE transmission mode, and the transmission mode in NR may be referred to as the NR resource allocation mode.

[0047] Specifically, (a) of FIG. 2 represents UE operations related to LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0048] Meanwhile, (b) of FIG. 2 shows UE operation related to LTE transmission mode 2 or LTE transmission mode 4 or NR resource allocation mode 2.

[0049] Referring to (a) of FIG. 2, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station may schedule SL resources to be used by the UE for SL transmission (S8000). For example, the base station may transmit information related to SL resources and / or information related to UL resources to the first UE. The UL resources may include PUCCH resources and / or PUSCH resources. In addition, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0050] A first UE may receive information related to a dynamic grant (DG) resource and / or information related to a configured grant (CG) resource from a base station. The CG resource may include a CG type 1 resource or a CG type 2 resource. In this specification, a DG resource may be a resource that a base station configures / allocates to the first UE via downlink control information (DCI). In addition, in this specification, a CG resource may be a (periodic) resource that a base station configures / allocates to the first UE via DCI and / or an RRC message. For example, in the case of a CG type 1 resource, the base station may transmit an RRC message including information related to the CG resource to the first UE. In the case of a CG type 2 resource, the base station may transmit an RRC message including information related to the CG resource to the first UE, and the base station may transmit a DCI related to activation or release of the CG resource to the first UE.

[0051] In step S8010, the first UE may transmit a PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to the second UE based on the resource scheduling. In step S8020, the first UE may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S8030, the first UE may receive a PSFCH (Physical Sidelink Feedback Channel) related to the PSCCH / PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE via the PSFCH. In step S8040, the first UE may transmit / report HARQ feedback information to the base station via a PUCCH or a PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. In addition, the HARQ feedback information reported to the base station may be information generated by the first UE based on a rule set in advance. The DCI may be DCI for scheduling the SL. The format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0052] [Table 2] shows an example of DCI for SL scheduling.

[0053] Format 3_0- Resource pool index -roof (log2I)) bits, whereIis the number of resource pools for transmission configured by the higher layer parametersl-TxPoolScheduling.- Time gap - 3 bits determined by higher layer parametersl-DCI-ToSL-Trans- HARQ process number - 4 bits- New data indicator - 1 bit- Lowest index of the subchannel allocation to the initial transmission roof (log2(N SLsubChannel)bits- SCI format 1-A fields:- Frequency resource assignment.- Time resource assignment.- PSFCH-to-HARQ feedback timing indicator -roof (log2N_fb_timing) bits, where N_fb_timing is the number of entries in the higher layer parametersl-PSFCH-ToPUCCH- PUCCH resource indicator - 3 bits.- Configuration index - 0 bit if the UE is not configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI; otherwise 3 bits. If the UE is configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI, this field is reserved for DCI format 3_0 with CRC scrambled by SL-RNTI.- Counter sidelink assignment index - 2 bits- 2 bits if the UE is configured withpdsch-HARQ-ACK-Codebook = dynamic- 2 bits if the UE is configured withpdsch-HARQ-ACK-Codebook = semi-static- Padding bits, if requiredFormat 3_1- Timing offset - 3 bits determined by higher layer parametersl-TimeOffsetEUTRA- Carrier indicator -3 bits.- Lowest index of the subchannel allocation to the initial transmission - roof (log2N. SL subCh ) bits.- Frequency resource location of initial transmission and retransmission- Time gap between initial transmission and retransmission- SL index - 2 bits- SL SPS configuration index - 3 bits.- Activation / release indication - 1 bit.

[0054] Referring to (b) of FIG. 2, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE can determine SL transmission resources within SL resources configured by the base station / network or preset SL resources. The configured SL resources or preset SL resources may be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. The UE can perform SL communication by selecting resources within the configured resource pool. For example, the UE can perform sensing and resource (re)selection procedures to select resources within a selection window. The sensing may be performed on a subchannel basis.

[0055] In step S8010, a first UE that has selected a resource within a resource pool can transmit a PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to a second UE using the resource. In step S8020, the first UE can transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S8030, the first UE can receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0056] Referring to (a) or (b) of FIG. 2, a first UE may transmit an SCI to a second UE on a PSCCH. Alternatively, the first UE may transmit two consecutive SCIs (e.g., 2-stage SCIs) to the second UE on the PSCCH and / or the PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., 2-stage SCIs) to receive the PSSCH from the first UE. In this specification, an SCI transmitted on a PSCCH may be referred to as a 1st SCI, a 1st SCI, a 1st-stage SCI, or a 1st-stage SCI format, and an SCI transmitted on a PSSCH may be referred to as a 2nd SCI, a 2nd SCI, a 2nd-stage SCI, or a 2nd-stage SCI format. For example, a 1st-stage SCI format may include SCI format 1-A, and a 2nd-stage SCI format may include SCI format 2-A and / or SCI format 2-B.

[0057]

[0058] As described above, based on the sidelink communication method, one embodiment of the present invention proposes a method of transmitting HARQ feedback information for PSSCH via PSFCH, while defining and utilizing multiple PSFCH periods to resolve issues such as collisions at HARQ feedback timings. However, considering the possibility of terminology changes in 6G and subsequent communication systems as described above, the terminology used in 5G will be generalized.

[0059] FIG. 3 is a diagram for explaining a direct communication method between UEs using multiple feedback periods according to one embodiment of the present invention.

[0060] In the example of Fig. 3, it is assumed that the Tx UE is UE1 and the Rx UE is UE2.

[0061] UE1 may transmit data to UE2 via a first direct communication data channel (S310). In response, UE1 may receive first feedback information for the first direct communication data channel from UE2 via a physical layer feedback channel (S320).

[0062] The physical layer feedback channel may be a channel corresponding to the PSFCH among the 5G channels related to FIG. 2, and the PSFCH time for receiving the first feedback information from UE2 may be determined based on the period of the PSFCH and the minimum processing time (K) between the PSSCH and the PSFCH.

[0063] In addition, in the current 5G mobile communication system, when the number of feedback information that a UE can transmit in one PSFCH period is Nmax and the number of feedback information that can be transmitted in one PSFCH period is N, a situation where Nmax > N may occur.

[0064] In this case, the UE (UE2 in FIG. 3) must drop Nmax - N pieces of feedback information and transmit the dropped feedback information in the PSFCH transmission cycle of the next cycle, which may cause a communication delay.

[0065] Therefore, in one embodiment of the present invention, it is proposed to prevent such communication delay by configuring multiple physical layer feedback channel periods corresponding to transmission of one direct communication data channel (e.g., PSSCH).

[0066]

[0067] Referring again to FIG. 3, from the perspective of UE1, which is a Tx UE, receiving the first feedback information may include monitoring the first feedback information in multiple physical layer feedback channel periods (S330). Specifically, from the perspective of UE1, monitoring the first feedback information may correspond to monitoring the first feedback information in a first period among multiple physical layer feedback channels, and if the first feedback information is not received in the first period, monitoring the first feedback information in a second period.

[0068] From the perspective of UE2, which is the Rx UE, transmitting the first feedback information is proposed to be done through one of multiple physical layer feedback channel periods. As for one or more other of the multiple physical layer feedback channel periods, the HARQ feedback collision problem can be resolved by utilizing feedback information for other UEs using different beams, as described below.

[0069]

[0070] Figure 4 is a drawing showing an example of applying the method of Figure 3 to a 5G system.

[0071] In the example of Fig. 4, the timing of the PSFCH is illustrated as an example in which multiple timings are defined, such as the first timing (p) and the second timing (p+1).

[0072] These multiple PSFCH periods are arranged after K=3 slots, which is the minimum time for HARQ processing, from the corresponding PSSCH reception time, and the example of Fig. 4 illustrates the case where the PSFCH transmission period is 4 slots (N=4).

[0073] AGC (Automatic Gain Control) can be viewed as a signal that repeatedly transmits a copy of the symbol that is subsequently transmitted to secure reception performance at the receiving end.

[0074] Looking at the method of FIG. 3 in relation to the resource structure of FIG. 4, in response to the PSSCH (S310) transmitted by UE1, UE2 can transmit a HARQ feedback signal through either the PSFCH period (p) or the PSFCH period (p+1) (S320).

[0075] Accordingly, UE1 can monitor PSFCH timing (p) primarily, and then, if feedback information for the transmitted PSSCH is not received, monitor PSFCH timing (p+1) secondarily.

[0076]

[0077] This provision of multiple feedback periods can also be utilized when a particular UE needs to transmit and receive PSFCH simultaneously, and FIG. 5 illustrates an exemplary situation for such a case.

[0078] FIG. 5 is a diagram for explaining a case in which a specific UE must simultaneously transmit and receive a physical layer feedback channel according to one embodiment of the present invention.

[0079] As illustrated in FIG. 5, Tx 1 can transmit data (e.g., PSSCH) to Rx 1 and receive a physical layer feedback channel (e.g., PSFCH) for the data.

[0080] At the same time, Tx 1 can receive data (e.g., PSSCH) from Tx 2 as Rx2 and transmit a physical layer feedback channel (e.g., PSFCH) for the data to Tx 2.

[0081] That is, there may be cases where a specific UE must transmit and receive PSFCH simultaneously, and different beams may be used between different UEs.

[0082] In this case, if multiple PSFCH periods (p, p+1) such as those in FIG. 4 are specified, when a PSFCH from Rx1 is received through a specific PSFCH period (p), Rx2 may be configured to transmit a PSFCH to Tx 2 through another PSFCH period (p+1).

[0083]

[0084] In the description of the above-described embodiments, the positions of the plurality of physical layer feedback channel times may be determined based on the position of the transmitting data channel and / or information of the transmitting and receiving UEs. In addition, it is assumed that the plurality of physical layer feedback channel times are defined in different time units, which may correspond to 'slots' and 'symbols' in 5G mobile communication systems, but may be defined as different time units in 6G and subsequent mobile communication systems. However, it is preferable that such 'time units' be time units in which transmission and reception signals and beams can be exchanged from the perspective of the UE.

[0085]

[0086] FIGS. 6 and 7 are drawings for explaining a method for avoiding a beam collision situation according to another embodiment of the present invention.

[0087] As illustrated in FIG. 6, one UE (Rx UE) can simultaneously transmit and receive direct communication data channels with two Tx UEs (Tx1 and Tx2). At this time, different beams may be used for each Tx UE, which may be problematic, especially when using the high-frequency band (FR2) of 5G or the corresponding 6G band.

[0088] In this situation, the Rx UE can transmit the HARQ feedback signal using one PSFCH resource among multiple PSFCH periods. For example, as illustrated in FIG. 7, the HARQ feedback signal for PSSCH 1 received from Tx UE2 can be allocated to PSFCH period (p), and the HARQ feedback signal for PSSCH 2 received from Tx UE1 can be allocated to PSFCH period (p+1). That is, according to the present embodiment, the PSFCH multi-beam operation can be efficiently specified through multiple PSFCH periods.

[0089] In addition, a PSFCH transmission beam can be determined when a PSFCH transmission collision occurs by using multiple PSFCH times according to the present embodiment. For example, as illustrated in FIG. 7, the HARQ feedback signal of PSSCH 1 can be fed back through beam #2 according to the setting of Tx 2 at PSFCH time (p), and the HARQ feedback signal of PSSCH 2 can be fed back through beam #1 according to the setting of Tx 1 at PSFCH time (p+1).

[0090]

[0091] Figure 8 illustrates a wireless device to which the present technology can be applied.

[0092] Referring to FIG. 8, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, the first wireless device (100) and the second wireless device (200) can correspond to UE 1 and UE 2 of FIG. 3, respectively.

[0093] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0094] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may store software code including commands for performing some or all of the processes controlled by the processor (202) or performing the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0095] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0096] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0097] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0098] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0099]

[0100] The detailed description of the preferred embodiments of the present invention disclosed above has been provided to enable those skilled in the art to implement and practice the present invention. While the above description has been made with reference to preferred embodiments of the present invention, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the scope of the present invention. For example, those skilled in the art can utilize the individual components described in the above-described embodiments in combination with each other.

[0101] Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0102] The sidelink beam management method and user equipment therefor according to the embodiments of the present invention as described above are suitable for use in a sidelink communication environment discussed in 3GPP, but as described above, they can also be widely used for beam management between UEs in communication methods other than 3GPP.

Claims

1. In a method for a first user equipment (UE) to perform direct communication with a second UE in a mobile communication system, Transmitting a first direct communication data channel to the second UE; Including receiving first feedback information for the first direct communication data channel from the second UE through a physical layer feedback channel, Receiving the above first feedback information, A method for performing direct communication, comprising monitoring said first feedback information at multiple physical layer feedback channel occasions.

2. In paragraph 1, Monitoring the above first feedback information is: Monitor the first feedback information at the first time among the plurality of physical layer feedback channels, A method for performing direct communication, comprising: monitoring the first feedback information at a second time period when the first feedback information is not received at the first time period.

3. In paragraph 1, Receive a second direct communication data channel from a third UE; Additionally comprising transmitting second feedback information for the second direct communication data channel to the third UE through the physical layer feedback channel, A method for performing direct communication, wherein when the first feedback information is monitored through any one of the plurality of physical layer feedback channel periods, the second feedback information is transmitted through any other one of the plurality of physical layer feedback channel periods.

4. In paragraph 1, A method for performing direct communication, wherein the above multiple physical layer feedback channel periods transmit the physical layer feedback channel through different beams.

5. In paragraph 1, A method for performing direct communication, wherein the above multiple physical layer feedback channel periods are specified in different time units.

6. In paragraph 1, The above first direct communication data channel corresponds to PSSCH (Physical Sidelink Shared Channel), The above physical layer feedback channel is a direct communication performing method corresponding to the PSFCH (Physical Sidelink Feedback Channel).

7. In a method for a second user equipment (UE) to perform direct communication with a first UE in a mobile communication system, Receive a first direct communication data channel from the first UE; Including transmitting first feedback information for the first direct communication data channel to the first UE through a physical layer feedback channel, Transmitting the above first feedback information is: A method for performing direct communication, comprising transmitting said first feedback information via any one of a plurality of physical layer feedback channel occasions.

8. In paragraph 7, Receive a second direct communication data channel from a third UE; Additionally comprising transmitting second feedback information for the second direct communication data channel to the third UE through the physical layer feedback channel, A method for performing direct communication, wherein the second feedback information is transmitted through another one of the plurality of physical layer feedback channel periods.

9. In paragraph 7, A method for performing direct communication, wherein the above multiple physical layer feedback channel periods transmit the physical layer feedback channel through different beams.

10. In paragraph 7, A method for performing direct communication, wherein the above multiple physical layer feedback channel periods are specified in different time units.

11. In paragraph 7, The above first direct communication data channel corresponds to PSSCH (Physical Sidelink Shared Channel), The above physical layer feedback channel is a direct communication performing method corresponding to the PSFCH (Physical Sidelink Feedback Channel).

12. In a mobile communication system, a first user equipment (UE) that performs direct communication with a second user equipment (UE), at least one processor; and At least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations; The above actions are, Transmitting a first direct communication data channel to the second UE; Including receiving first feedback information for the first direct communication data channel from the second UE through a physical layer feedback channel, Receiving the above first feedback information, A user device comprising monitoring said first feedback information at multiple physical layer feedback channel occasions.

13. In a mobile communication system, a second UE that performs direct communication with a first user equipment (UE), at least one processor; and At least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations; The above actions are, Receive a first direct communication data channel from the first UE; Including transmitting first feedback information for the first direct communication data channel to the first UE through a physical layer feedback channel, Transmitting the above first feedback information is: A user device comprising transmitting said first feedback information via any one of a plurality of physical layer feedback channel occasions.

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