Sidelink beam management method and user equipment therefor

Abstract

The present document relates to a sidelink beam management method and a user equipment therefor. To this end, a sidelink beam management method of a first user equipment (UE) comprises the steps of: establishing a unicast link with a second UE; and transmitting, after establishing the unicast link, report information on the beam quality to a second UE, wherein the transmitting of the report information on the beam quality comprises: transmitting first beam-related information of 2 bits or less through a physical sidelink feedback channel (PSFCH); and transmitting second beam-related information through a medium access control (MAC) control element (CE).

Description

Sidelink beam management method and user device therefor

[0001] The following description relates to sidelink, and describes a method for performing sidelink beam management between user equipment (UE) and a user equipment 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] FieldBandwidth1 antenna port2 antenna ports4 antenna ports> 4 antenna portsRank 1~4Rank 5~8Rank Indicator0min (1, roof (log2n RI ))min (2, roof (log2n RI ))roof (log2n RI )roof (log2n RI )Layer Indicator0roof (log2v)min (2, roof (log2v))min (2, roof (log2v))min (2, roof (log2v))Wide-band CQI44448Subband differential CQI22224CRIroof (log2(K s CSI-RS ))roof (log2(K s CSI-RS ))roof (log2(K s CSI-RS ))roof (log2(K s CSI-RS ))roof (log2(K s CSI-RS ))

[0008] In the above [Table 1] K sCSI-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.

[0009] Meanwhile, in the system for 5G communication as described above, UEs (10) can be connected via a PC5 interface, and a link via PC5 can be referred to as a sidelink. In the 5G communication system and its successor next-generation mobile communication, beam management as described above is discussed as being necessary for sidelink communication as well.

[0010] However, in sidelink communication, there is no information transmission means capable of transmitting control information of tens to hundreds of bits, such as the UCI described above, and therefore, further research is required on a method for efficiently performing beam management in sidelink.

[0011] In order to solve the above-described problem, one aspect of the present invention proposes a method for efficiently performing sidelink beam management and a user equipment (UE) for the same.

[0012] Specifically, we consider the Physical Sidelink Feedback Channel (PSFCH) and the Medium Access Control (MAC) Control Element (CE) as feedback information transmission means for sidelink beam management, and propose a method for efficiently exchanging feedback information on beam quality through a combination of these.

[0013] In addition, in sidelink beam management, we examine the difference between beam management during the beam pairing process before establishing a unicast link between UEs and beam management after establishing a unicast link, and propose a feedback performing method for efficient beam management after establishing a unicast link and a UE for this purpose.

[0014] 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.

[0015] In one aspect of the present invention for solving the above-described problem, a method for performing sidelink beam management between a first user equipment (UE) and a second UE in a mobile communication system is proposed, the method comprising: establishing a unicast link with the second UE; and transmitting, after the unicast link is established, report information on beam quality to the second UE, wherein transmitting the report information on beam quality comprises transmitting first beam-related information of 2 bits or less through a Physical Sidelink Feedback Channel (PSFCH); and transmitting second beam-related information through a Medium Access Control (MAC) Control Element (CE).

[0016] In another aspect of the present invention for solving the above-described problem, a user equipment (UE) device is proposed, comprising: a first UE for performing sidelink beam management with a second UE in a mobile communication system, the first UE 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, the operations including: establishing a unicast link with the second UE; and transmitting, after the unicast link is established, report information on beam quality to the second UE, wherein transmitting the report information on beam quality includes transmitting first beam-related information of 2 bits or less via a Physical Sidelink Feedback Channel (PSFCH); and transmitting second beam-related information via a Medium Access Control (MAC) Control Element (CE).

[0017] The above first beam-related information may have a length of 1 bit, and may indicate one of whether the reception intensity of the beam used as the unicast link exceeds a threshold, whether the reception intensity of the beam showing the greatest reception intensity exceeds the threshold, whether the reception intensity of all beams reported as the second beam-related information exceeds the threshold, or whether the reception intensity of all set beams exceeds the threshold.

[0018] In another embodiment, the first beam-related information may have a length of 2 bits, which may indicate one of: whether each reception intensity for the beam used as the unicast link and the candidate beam exceeds a threshold; whether each reception intensity for the beam used as the unicast link and the beam having the highest reception intensity exceeds the threshold; whether each reception intensity for the beam used as the unicast link and all beams reported as the second beam-related information exceeds the threshold; and whether each reception intensity for the beam having the highest reception intensity and the beam having the second highest reception intensity exceeds the threshold.

[0019] Meanwhile, the second beam-related information may include at least one of the CRI (CSI-RS Resource Indicator) and L1-RSRP (Reference Signal Received Power) of each reporting target beam.

[0020] Specifically, the second beam related information may be transmitted through either a first type MAC CE including only the CRI among the CRI and the L1-RSRP, or a second type MAC CE including both the CRI and the L1-RSRP.

[0021] In another embodiment of the present invention, the first beam-related information has a length of 1 bit, and the second beam-related information may be interpreted differently depending on the first beam-related information.

[0022] Meanwhile, the PSFCH transmitting the first beam-related information may correspond to format 0 of the PUCCH (Physical Uplink Control Channel).

[0023] Additionally, the reporting information on the beam quality may include feedback information on the SA (Standalone) CSI-RS (Channel Status Information - Reference Signal) received from the second UE.

[0024] Additionally, the reporting information on the beam quality may include feedback information on the NSA (Non-Standalone) CSI-RS (Channel Status Information - Reference Signal) received from the second UE.

[0025] According to the embodiments of the present invention as described above, sidelink beam management can be efficiently performed while minimizing changes to the regulations of existing standards.

[0026] Specifically, PSFCH and MAC CE are considered as feedback information transmission means for sidelink beam management, and their combination can efficiently exchange feedback information on beam quality.

[0027] In addition, in sidelink beam management, a feedback performance method optimized for beam management after unicast link establishment can be provided by considering the difference between beam management in the beam pairing process before establishing a unicast link between UEs and beam management after unicast link establishment.

[0028] 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.

[0029] Figure 1 shows the structure of a system for 5G communication.

[0030] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0031] FIG. 3 is a diagram for explaining a method for performing sidelink beam management between user devices according to one embodiment of the present invention.

[0032] FIG. 4 is a diagram for explaining the concept of initial beam pairing in a unicast link setup step according to one embodiment of the present invention.

[0033] FIGS. 5 to 7 are diagrams for explaining transmission forms of PSFCH available according to one embodiment of the present invention.

[0034] FIGS. 8 to 10 are diagrams for explaining beam-related information transmitted through MAC CE according to one embodiment of the present invention.

[0035] FIG. 11 and FIG. 12 are diagrams for explaining a method of interpreting MAC CE information differently depending on information transmitted through PSFCH according to one embodiment of the present invention.

[0036] Figure 13 illustrates a wireless device to which the present technology can be applied.

[0037] 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.

[0038] 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.

[0039]

[0040] As described above, one aspect of the present invention proposes a method for efficiently performing sidelink beam management and a user equipment (UE) for doing so. To this end, we first examine channels that can be used for beam management in sidelink communications.

[0041] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] [Table 2] shows an example of DCI for SL scheduling.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053]

[0054] Based on the sidelink communication method as described above, one embodiment of the present invention proposes to consider MAC CE that can be transmitted through the above-described PSFCH and PSSCH as a means of transmitting feedback information for sidelink beam management.

[0055] FIG. 3 is a diagram for explaining a method for performing sidelink beam management between user devices according to one embodiment of the present invention.

[0056] First, the first UE can establish a unicast link with the second UE (S310), and in this embodiment, a beam management method after establishing a unicast link between the first UE and the second UE is assumed and described.

[0057] After unicast link setup (S310), the first UE can receive a beam signal from the second UE (S320). At this time, the beam received from the second UE can include various forms such as SSB (Synchronization Signal Block) and CSI-RS (Channel Status Information - Reference Signal), but beam management after unicast link setup is generally assumed to be performed through CSI-RS, and accordingly, FIG. 3 illustrates a situation in which RS is received.

[0058] In this way, the first UE, which has received the beam of the second UE, transmits report information on beam quality to the second UE (S330), and specifically, it is proposed to include transmitting first beam-related information of 2 bits or less via PSFCH and second beam-related information via MAC CE. Through the combination of the first beam-related information and the second beam-related information, feedback information for performing efficient beam management in the proposed site link resource situation can be transmitted. The specific combination of the first / second beam-related information will be described in detail later with reference to FIGS. 5 to 12.

[0059] First, we explain the difference in beam management during the unicast link setup phase and after the unicast link setup phase.

[0060] FIG. 4 is a diagram for explaining the concept of initial beam pairing in a unicast link setup step according to one embodiment of the present invention.

[0061] In the embodiment illustrated in FIG. 4, UE 1 and UE 2 each have four beams (a1, a4, a4, and b1, a4, b4). The beams of UE 1 and UE 2 may have a shape that partially overlaps each other, as illustrated in FIG. 4.

[0062] To determine the best beam pairing between UE 1 and UE 2, UE 1 can transmit a Direct Connection Request (DCR) message over 16 (= 4*4) consecutive slots, during which UE 1 and UE 2 can perform beam sweeping to check 16 possible beam pairings.

[0063] If UE 2 successfully decodes the DCR message transmitted by UE 1 and UE 2 decides to establish a unicast link over a specific beam, UE 2 may transmit feedback to UE 1 over the PSFCH associated with the PSCCH / PSSCH resources used to transmit the DCR message. This feedback may implicitly provide information about the optimal beam pairing in relation to the corresponding resources.

[0064] That is, in the case of initial beam pairing at the unicast link setup stage, the optimal beam pairing can be fed back through simple feedback information via PSFCH through the corresponding time / frequency resource relationship in the process of performing beam sweeping.

[0065] However, after a unicast link is established, beam sweeping in slot units (or corresponding time units) as described above is not performed, and therefore, it is difficult to implicitly indicate a specific CRI for beam management through the location of the PSFCH through which it is transmitted.

[0066] Therefore, in this embodiment, we propose a method of explicitly transmitting feedback information for beam management through a combination of PSFCH and MAC CE at a stage after unicast link establishment, while efficiently supplementing limited PSFCH information through MAC CE.

[0067]

[0068] FIGS. 5 to 7 are diagrams for explaining transmission forms of PSFCH available according to one embodiment of the present invention.

[0069] Specifically, FIG. 5 summarizes the five formats of the current PUCCH, and illustrates the concept of setting the format of the PSFCH to correspond to the current PUCCH format 0 (510) in a preferred embodiment of the present invention so that information of 2 bits or less can be transmitted through the PSFCH. This can be viewed as a concept of minimizing changes to the format of the existing PSFCH, transmitting some information through the PSFCH, and supplementing the missing number of bits through the MAC CE as described below.

[0070] In another embodiment of the present invention, the format of the PSFCH may be considered to provide information with a number of bits greater than 2, such as PUCCH formats 2 to 4 (520), in which case both CRI and L1-RSRP may be transmitted only through the PSFCH. However, in the case of following this embodiment, a new PSFCH format different from the existing PSFCH format is required, and from the viewpoint of possibly burdening standardization, the following description assumes that reporting information for sidelink beam management is transmitted through a combination of PSFCH and MAC CE.

[0071] Meanwhile, as shown in Fig. 6, the PSFCH has a transmission period (N) greater than the minimum PSFCH time interval (Tmin.gap). PSFCH PSSCH ) can be transmitted, and the resource block set (M) in which the PSFCH is transmitted PSFCH PRB set ) can be provided to UEs as SL-PSFCH-Config information.

[0072] As illustrated in FIG. 7, PSFCH symbols can be arranged in association with PSSCH slots. In addition, PSFCHs can be distinguished not only by time / frequency but also by codes, and FIG. 7 illustrates an example in which PSFCHs are distinguished by two cyclic pairs (Q=2). FIG. 7 illustrates an example in which HARQ feedback information for PSSCH is transmitted as general PFSCH information, but in one embodiment of the present invention, information of 2 bits or less is proposed to be transmitted as first beam-related information among the beam quality-related information received through such PSFCH.

[0073] For example, the first beam-related information transmitted through the PSFCH has a length of 1 bit,

[0074] (1) Whether the reception strength of the beam used as the above unicast link exceeds the threshold;

[0075] (2) Whether the reception intensity of the beam showing the greatest reception intensity exceeds the threshold;

[0076] (3) Whether the reception intensity of all beams reported as the second beam-related information exceeds the threshold;

[0077] (4) Whether the reception intensity of all set beams exceeds the threshold;

[0078] It can represent either of the following.

[0079] For another example, the first beam-related information transmitted via PSFCH has a length of 2 bits,

[0080] (1) Whether the reception strength of each beam and candidate beam used as a unicast link exceeds the threshold;

[0081] (2) For the beam used as a unicast link and the beam showing the greatest reception intensity, whether each reception intensity exceeds the threshold;

[0082] (3) For each beam used as a unicast link and all beams reported with the second beam-related information, whether the reception strength exceeds the threshold;

[0083] (4) For the beam showing the greatest reception intensity and the beam showing the second greatest reception intensity, whether each reception intensity exceeds the threshold;

[0084] It can represent either of the following:

[0085]

[0086] FIGS. 8 to 10 are diagrams for explaining beam-related information transmitted through MAC CE according to one embodiment of the present invention.

[0087] Specifically, FIG. 8 is a diagram illustrating a format of a MAC CE used for Beam Failure Reporting (BFR) in general downlink beam management. The MAC CE for BFR can indicate whether it includes a CRI having a reception intensity higher than one or more BFR thresholds through an AC field, and has a format for transmitting the corresponding CRI information through a subsequent candidate RS ID or reserved bit. In the present embodiment, the format of this MAC CE is also useful for sidelink beam management, and it is proposed to transmit the CRI and at least one of L1-RSRP of each reporting target beam as second beam-related information transmitted through the MAC CE.

[0088] Meanwhile, Fig. 9 illustrates the format of a MAC CE for sidelink CSI reporting. The MAC CE for sidelink CSI reporting has a format that includes a Rank Indicator (RI), a Channel Quality Indicator (CQI), and 3 reserved bits. In one embodiment of the present invention, this format of the MAC CE is also useful for sidelink beam management, and can be utilized when only the CRI is transmitted as secondary beam-related information transmitted through the MAC CE.

[0089] In summary, as shown in FIG. 10, when only CRI is reported through MAC CE, the first type MAC CE format (1110) as shown in FIG. 9 can be utilized, and at this time, CRI can be transmitted using the reserved bit of FIG. 9.

[0090] In addition, when transmitting both CRI and CSI-RSRP via MAC CE, it is possible to transmit via a second type MAC CE format (1120, 1130) that is a combination of the MAC CE format illustrated in FIG. 8 and the MAC CE format illustrated in FIG. 9. Specifically, in the second type MAC CE format of reference numeral 1120, the CRI can be transmitted via a reserved bit following the CQI, like in the first type MAC CE format of reference numeral 1110. In addition, in the second type MAC CE format of reference numeral 1130, the CRI can also be transmitted via a reserved bit following the AC field.

[0091]

[0092] FIG. 11 and FIG. 12 are diagrams for explaining a method of interpreting MAC CE information differently depending on information transmitted through PSFCH according to one embodiment of the present invention.

[0093] Specifically, in this embodiment, it is assumed that the first beam-related information transmitted through the PSFCH has a length of 1 bit. Accordingly, in the case of FIG. 11, it is determined whether the corresponding PSFCH information is 1 or 0 (S1110), and if the information of the PSFCH is 1, this indicates that the reception strength of the beam currently being used as the unicast link has exceeded a threshold, and thus the information transmitted through the MAC CE is interpreted as information excluding the CRI and RSRP information being used (S1120), and if the information of the PSFCH is 0, it can be interpreted that each CRI and RSRP information is transmitted through the MAC CE (S1130).

[0094] As another example of Fig. 11, it is determined whether the corresponding PSFCH information is 1 or 0 (S1110), and if the information of the PSFCH is 1, this indicates that the reception intensity of the beam with the maximum RSRP exceeds the threshold, and thus the information transmitted through the MAC CE is interpreted as information excluding the CRI and RSRP information of the beam with the maximum RSRP (S1120), and if the information of the PSFCH is 0, it can be interpreted that each CRI and RSRP information is transmitted through the MAC CE (S1130).

[0095] Meanwhile, in the example of FIG. 12, it is determined whether the corresponding PSFCH information is 1 or 0 (S1210), and if the information of the PSFCH is 1, this indicates that all beams reported to the MAC CE exceed the threshold, and the information transmitted through the MAC CE is interpreted as only CRI being transmitted (S1220), and if the information of the PSFCH is 0, it can be interpreted as each CRI and RSRP information being transmitted through the MAC CE (S1230).

[0096] In another example of Fig. 12, it is determined whether the corresponding PSFCH information is 1 or 0 (S1210), and if the information of the PSFCH is 1, this indicates that the reception intensity of all set beams exceeds the threshold, and it is interpreted that information is not transmitted through the MAC CE (S1220), and if the information of the PSFCH is 0, it can be interpreted that each CRI and RSRP information is transmitted through the MAC CE (S1230).

[0097]

[0098] The beam quality reporting information according to various embodiments of the present invention as described above may correspond to feedback information for CSI-RS received from a second UE from the perspective of a first UE. In a stage prior to the establishment of a unicast link, beam quality reporting may be performed based on the correlation between the PSSCH and the PSFCH, and therefore, there is a limitation that it cannot be applied to transmitting feedback information for a SA (Standalone) CSI-RS in which a PSSCH does not exist.

[0099] However, since feedback information on beam quality is transmitted through a combination of PSFCH and MAC CE as described above in the step after unicast link establishment according to the present embodiment and does not depend on the correlation between PSSCH and PSFCH, these embodiments can be applied as feedback information for both SA CSI-RS and NSA (Non-Stand Alone) CSI-RS.

[0100]

[0101] Figure 13 illustrates a wireless device to which the present technology can be applied.

[0102] Referring to FIG. 13, 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.

[0103] 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.

[0104] 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 for performing the descriptions, functions, procedures, proposals, methods and / or operation 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109]

[0110] 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.

[0111] 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.

[0112] 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 performing sidelink beam management between a first user equipment (UE) and a second UE in a mobile communication system, Establish a unicast link with the second UE; After the unicast link is established, transmitting report information on beam quality to the second UE, Transmitting reporting information on the above beam quality, Transmit first beam related information of 2 bits or less through PSFCH (Physical Sidelink Feedback Channel); A sidelink beam management method comprising transmitting second beam related information via MAC (Medium Access Control) CE (Control Element).

2. In paragraph 1, The above first beam related information has a length of 1 bit, Whether the reception strength of the beam used as the above unicast link exceeds the threshold, Whether the reception intensity of the beam exhibiting the greatest reception intensity exceeds the above threshold, Whether the reception intensity of all beams reported as the second beam related information exceeds the threshold; Whether the reception intensity of all set beams exceeds the above threshold, A method of managing sidelink beams, which represents one of:

3. In paragraph 1, The above first beam related information has a length of 2 bits, For each beam and candidate beam used as the above unicast link, whether the reception strength exceeds the threshold, For each beam used as the unicast link and the beam showing the greatest reception intensity, whether the reception intensity exceeds the threshold; For each beam used as the unicast link and all beams reported with the second beam related information, whether the reception strength exceeds the threshold; For the beam exhibiting the highest reception intensity and the beam exhibiting the second highest reception intensity, whether each reception intensity exceeds the above threshold; A method of managing sidelink beams, which represents one of:

4. In paragraph 1, The above second beam related information is: A sidelink beam management method, comprising at least one of CRI (CSI-RS Resource Indicator) and L1-RSRP (Reference Signal Received Power) for each reporting target beam.

5. In paragraph 4, The above second beam related information is: A first type MAC CE including only the CRI among the CRI and the L1-RSRP, or A second type MAC CE including both the CRI and the L1-RSRP, A method for managing sidelink beams, transmitted through either of the following.

6. In paragraph 1, The above first beam related information has a length of 1 bit, A sidelink beam management method, wherein the second beam-related information is interpreted differently depending on the first beam-related information.

7. In paragraph 1, A sidelink beam management method, wherein the PSFCH transmitting the first beam-related information corresponds to format 0 of the PUCCH (Physical Uplink Control Channel).

8. In paragraph 1, Reporting information on the above beam quality is: A sidelink beam management method including feedback information for SA (Standalone) CSI-RS (Channel Status Information - Reference Signal) received from the second UE.

9. In paragraph 1, Reporting information on the above beam quality is: A sidelink beam management method including feedback information for NSA (Non-Standalone) CSI-RS (Channel Status Information - Reference Signal) received from the second UE.

10. In a mobile communication system, a first UE performs sidelink beam management 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, Establish a unicast link with the second UE; After the unicast link is established, transmitting report information on beam quality to the second UE, Transmitting reporting information on the above beam quality, Transmit first beam related information of 2 bits or less through PSFCH (Physical Sidelink Feedback Channel); A user device device comprising transmitting second beam related information via a MAC (Medium Access Control) CE (Control Element).

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