Sidelink communication method and user equipment therefor

Abstract

The present document relates to a sidelink communication method and a user equipment (UE) therefor. The method therefor involves a first UE transmitting to a second UE: first-step sidelink control information (SCI) through a physical sidelink control channel (PSCCH); at least one of second-step SCI or data related to the first-step SCI through a physical sidelink shared channel (PSSCH); a physical sidelink feedback channel (PSFCH) including feedback information about sidelink with the second UE; and channel status information - reference signal (CSI-RS) for sidelink beam management. Here, the transmitting of the CSI-RS includes transmitting a standalone CSI-RS without data transmission, and when the standalone CSI-RS overlaps one or more of the PSCCH, the PSSCH, and the PSFCH in a time-frequency resource region, whether to transmit the standalone CSI-RS is determined on the basis of priority information.

Description

Sidelink communication method and user device therefor

[0001] The following description is about sidelink, and more specifically, a communication method that takes into account resource overlap between sidelink signals and a user device 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]

[0007] 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. In the 5G communication system and its subsequent next-generation mobile communication, various signals are transmitted in sidelink communication, and in a recent 3GPP standardization meeting, the use of standalone (SA) CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management is being discussed.

[0008] However, there has been no clear discussion on how the UE will handle cases where the various signals transmitted in the sidelink communication and the SA CSI-RS described above overlap in the time-frequency domain.

[0009] In order to solve the above-described problem, one aspect of the present invention proposes a communication method that takes into account resource overlapping between sidelink signals.

[0010] Specifically, when the SA CSI-RS introduced for sidelink beam management overlaps with signals such as the Physical Sidelink Control Channel (PSCCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Feedback Channel (PSFCH) in the time-frequency domain, we propose a method for transmitting signals based on priority information.

[0011] In addition, according to an embodiment, we would like to propose a method for signaling the above-described priority information.

[0012] In addition, we propose a method for resolving the overlapping relationship between signals when AGC (Automatic Gain Control) is additionally transmitted to improve reception performance on the sidelink receiving side.

[0013] In addition, in another aspect of the present invention, a user device for implementing the methods described above is proposed.

[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 communication between a first user equipment (UE) and a second UE in a mobile communication system comprises: transmitting a first stage SCI (Sidelink Control Information) to the second UE through a PSCCH (Physical Sidelink Control Channel); transmitting, to the second UE, one or more of a second stage SCI or data related to the first stage SCI through a PSSCH (Physical Sidelink Shared Channel); transmitting a PSFCH (Physical Sidelink Feedback Channel) including sidelink feedback information with the second UE; A sidelink communication method is proposed, comprising transmitting, to the second UE, a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management, wherein transmitting the CSI-RS includes transmitting a standalone CSI-RS that does not accompany data transmission, and when the standalone CSI-RS overlaps with one or more of the PSCCH, the PSSCH, or the PSFCH in a time-frequency resource domain, determining whether to transmit the standalone CSI-RS based on priority information.

[0016] The priority information for determining whether to transmit the standalone CSI-RS may be based on information of the first stage SCI.

[0017] Specifically, the priority information may be based on traffic L1 priority information of the first stage SCI.

[0018] In addition, when the standalone CSI-RS overlaps with the DMRS (Demodulation Reference Signal) of the PSCCH, it is preferable to transmit the DMRS of the PSCCH, and when the standalone CSI-RS overlaps with the PSSCH, it is preferable to transmit the standalone CSI-RS.

[0019] In addition, when the standalone CSI-RS overlaps with the DMRS of the PSCCH or the PSSCH, it is possible to determine whether to transmit the standalone CSI-RS based on the number of transmission resources of the PSCCH or the number of resources overlapping with the DMRS of the PSSCH, respectively.

[0020] In another embodiment of the present invention, transmitting the standalone CSI-RS may include additionally transmitting AGC (Automatic Gain Control).

[0021] At this time, if the AGC and the standalone CSI-RS overlap with the DMRS of the PSCCH, it is preferable not to transmit the AGC and the standalone CSI-RS.

[0022] If the AGC overlaps with the DMRS of the PSCCH and the standalone CSI-RS overlaps with the PSCCH, the AGC may not be transmitted, and the standalone CSI-RS may determine whether to transmit or not depending on the number of transmission resources of the PSCCH.

[0023] If the AGC overlaps with the DMRS of the PSCCH and the standalone CSI-RS overlaps with the DMRS of the PSSCH, the AGC may not be transmitted, and the standalone CSI-RS may determine whether to transmit or not based on the number of resources overlapping with the DMRS of the PSSCH.

[0024] If the AGC overlaps with the DMRS of the PSSCH and the standalone CSI-RS overlaps with the PSSCH, the AGC may not be transmitted and the standalone CSI-RS may be transmitted.

[0025] When the AGC overlaps with the DMRS of the PSCCH and the standalone CSI-RS overlaps with the DMRS of the PSSCH, it is possible to determine whether to transmit the AGC and the standalone CSI-RS depending on the number of resources overlapping with the DMRS of the PSSCH.

[0026] When the AGC and the standalone CSI-RS overlap with the PSSCH, the AGC and the standalone CSI-RS can be transmitted.

[0027] Whether to transmit the above AGC and the standalone CSI-RS can be determined based on the TCI (Transmission Configuration Index) status.

[0028] Meanwhile, in another aspect of the present invention for solving the above-described problem, a first user equipment (UE) performing sidelink communication with a second user equipment (UE) in a mobile communication system comprises 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, to the second UE, a first stage Sidelink Control Information (SCI) through a Physical Sidelink Control Channel (PSCCH); transmitting, to the second UE, at least one of a second stage SCI or data related to the first stage SCI through a Physical Sidelink Shared Channel (PSSCH); transmitting, to the second UE, a Physical Sidelink Feedback Channel (PSFCH) including sidelink feedback information with the second UE; We propose a user equipment characterized in that it comprises transmitting, to the second UE, a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management, wherein transmitting the CSI-RS includes transmitting a standalone CSI-RS that does not accompany data transmission, and when the standalone CSI-RS overlaps with one or more of the PSCCH, the PSSCH, or the PSFCH in a time-frequency resource domain, it determines whether to transmit the standalone CSI-RS based on priority information.

[0029] According to the embodiments of the present invention as described above, a method for specifically performing signal transmission in a resource overlapping situation between sidelink signals can be implemented.

[0030] Specifically, when the SA CSI-RS introduced for sidelink beam management overlaps with signals such as PSCCH / PSSCH / PSFCH in the time-frequency domain, the main signal can be transmitted quickly while maintaining sidelink communication performance by transmitting signals based on priority information.

[0031] Also, depending on the communication environment, 1 st By utilizing priority information through Stage SCI, flexible operation is possible depending on the environment.

[0032] In addition, even when AGC is additionally transmitted to improve the reception performance of the sidelink receiver, the operation of the UE can be clearly defined using the time-frequency domain relationship and priority information discussed in 3GPP.

[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 the concept of SA CSI-RS according to one embodiment of the present invention.

[0037] FIG. 4 is a diagram for explaining a sidelink communication method according to one embodiment of the present invention.

[0038] FIG. 5 is a diagram for explaining various situations in which SA CSI-RS overlaps with sidelink signals according to embodiments of the present invention.

[0039] FIG. 6 and FIG. 7 are drawings for explaining the concept of AGC related to another embodiment of the present invention.

[0040] FIG. 8 is a diagram for explaining an overlap situation with other sidelink signals when transmitting AGC and SA CSI-RS according to embodiments of the present invention.

[0041] Figures 9 to 13 are drawings for explaining the operation method in each of the various overlapping situations specified in Figure 8.

[0042] FIG. 14 is a diagram illustrating a case where AGC and SA CSI-RS overlap with PSSCH according to one embodiment of the present invention.

[0043] Figure 15 illustrates a wireless device to which the present technology can be applied.

[0044] 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.

[0045] 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.

[0046]

[0047] As described above, one aspect of the present invention proposes a communication method that takes into account resource overlap between sidelink signals. To this end, we first examine the channels available for sidelink communication.

[0048] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] A first UE can 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 can include a CG type 1 resource or a CG type 2 resource. In this specification, a DG resource can 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 can 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 can 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 can transmit an RRC message including information related to the CG resource to the first UE, and the base station can transmit a DCI related to activation or release of the CG resource to the first UE.

[0054] 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.

[0055] [Table 1] shows an example of DCI for SL scheduling.

[0056] Format 3_0- Resource pool index -floor (log_2 I) 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 floor (log_2 N^SL _subchannel) bits- SCI format 1-A fields:- Frequency resource assignment.- Time resource assignment.- PSFCH-to-HARQ feedback timing indicator - floor (log_2 N _ 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 - floor (log_2 (N^SL _ subchannel)) 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.

[0057] Referring to (b) of FIG. 2, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, a UE can determine an SL transmission resource within an SL resource configured by a base station / network or a preset SL resource. The configured SL resource or the preset SL resource 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 a resource within the configured resource pool. For example, the UE can select a resource within a selection window by performing a sensing and resource (re)selection procedure. The sensing may be performed on a subchannel basis. In step S8010, a first UE that has selected a resource within the 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 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 related to the PSCCH / PSSCH from the second UE.

[0058] 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.

[0059]

[0060]

[0061] *Figure 3 is a diagram for explaining the concept of SA CSI-RS according to one embodiment of the present invention.

[0062] In the sidelink communication between UE1 and UE2 described above with reference to FIG. 2, each UE needs to perform transmission / reception beam management, and in 3GPP, SSB (Synchronization Signal Block) can be used in some cases, but it is mainly assumed that CSI-RS is used.

[0063] The CSI-RS used for sidelink communication may include NSA (Non-Standalone) CSI-RS (310) and SA CSI-RS (320) as illustrated in FIG. 3.

[0064] NSA CSI-RS (310) is a CSI-RS transmitted together with data (PSSCH) to be transmitted by the UE, and SA CSI-RS (320) can be viewed as a CSI-RS transmitted for purposes such as beam management when the UE has no data to be transmitted together.

[0065] Although the resource region in which the SA CSI-RS (320) is transmitted has not yet been specifically defined, it may be transmitted at predetermined regular cycles (320a, 320b, 320c) as illustrated in FIG. 3. The SA CSI-RS (320) transmitted in this manner may overlap with the PSCCH / PSCCH DMRS (Demodulation Reference Signal) / PSSCH / PSSCH DMRS described above with reference to FIG. 2 in the time-frequency domain, and the example in FIG. 3 illustrates an example in which the third SA CSI-RS (320c) overlaps with the PSCCH.

[0066] Under these assumptions, one aspect of the present invention specifically specifies an operation method when SA CSI-RS overlaps with PSCCH / PSCCH DMRS (Demodulation Reference Signal) / PSSCH / PSSCH DMRS.

[0067] FIG. 4 is a diagram for explaining a sidelink communication method according to one embodiment of the present invention.

[0068] First, UE1 sends the first stage SCI (1) to UE2. st stage SCI) through the PSCCH (Physical Sidelink Control Channel), and the second stage SCI (2) related to the first stage SCI. nd Stage SCI) or one or more data can be transmitted through PSSCH, and PSFCH including sidelink feedback information with UE2 can be transmitted (S410).

[0069] Additionally, UE1 may transmit CSI-RS for sidelink beam management to UE2, and in this embodiment, transmitting CSI-RS may include transmitting SA CSI-RS that does not accompany data transmission as described above (S420).

[0070] At this time, SA CSI-RS can overlap with PSCCH / PSCCH DMRS / PSSCH / PSSCH DMRS as described above with respect to FIG. 3, and in this embodiment, it is proposed to determine whether to transmit SA CSI-RS based on priority information (S430).

[0071] At this time, the priority information is 1 as described above with respect to FIG. 2. st It may be based on information signaled by Stage SCI, or alternatively / in combination with it, it may be based on priority information of PSCCH / PSCCH DMRS / PSSCH / PSSCH DMRS itself.

[0072] Control signals generally have priority over data signals, and DMRSs required for specific signal transmission have a higher priority than those specific signals. Therefore, one embodiment of the present invention assumes and specifies the following priorities.

[0073] (1)PSCCH DMRS

[0074] (2)PSCCH

[0075] (3)PSSCH DMRS

[0076] (4)PSSCH

[0077] Therefore, when the SA CSI-RS overlaps with (1) the DMRS of the PSCCH, it is preferable to transmit the DMRS of the PSCCH, and when the SA CSI-RS overlaps with (4) the PSSCH, it is preferable to transmit the SA CSI-RS.

[0078] In addition, when the SA CSI-RS overlaps with the DMRS of (2) PSCCH or (3) PSSCH, the UE according to the present embodiment proposes to determine whether to transmit the SA CSI-RS according to the number of transmission resources of the PSCCH or the number of resources overlapping with the DMRS of the PSSCH, respectively.

[0079] For example, if SA CSI-RS overlaps with (2) PSCCH, if the number of transmission resources of PSCCH is greater than or equal to a predetermined threshold (X), SA CSI-RS is transmitted, and if it is less than the predetermined threshold, PSCCH can be transmitted.

[0080] Conversely, if the SA CSI-RS overlaps with the DMRS of (3) PSSCH, if the number of resources overlapping with the DMRS of the PSSCH is greater than or equal to a predetermined threshold (Y), the DMRS of (3) PSSCH can be transmitted, and if it is less than the predetermined threshold, the SA CSI-RS can be transmitted.

[0081]

[0082] If the above priority information is 1 st When transmitted via Stage CSI, 1 st It is possible to determine whether to transmit SA SCI-RS based on the 3 bits indicating the traffic L1 priority information of Stage SCI.

[0083] For example, if the L1 priority is 1, the PSCCH / PSSCH is given priority, and more generally, if the L1 priority is below a predetermined threshold (X), the PSCCH / PSSCH is given priority, and if the L1 priority exceeds the threshold (X), the CSI-RS can be given priority. If the L1 priority is 8, the CSI-RS can be given priority.

[0084] The methods described above, utilizing L1 priority information and utilizing priorities between sidelink signals, can be combined. Furthermore, if the PSFCH and SA CSI-RS overlap, prioritizing the PSFCH may be advantageous.

[0085]

[0086] In addition, in one embodiment of the present invention, SA CSI-RS may be distinguished from the PSCCH / PSSCH region in the time domain, and SA CSI-RS and PSFCH may be distinguished from each other in the frequency domain so that they do not overlap with each other.

[0087] However, since these embodiments have an aspect of suggesting a transmittable area of ​​SA CSI-RS, the following description specifically examines various cases in which overlap may occur between SA CSI-RS and PSCCH / PSCCH DMRS / PSSCH / PSSCH DMRS.

[0088]

[0089] FIG. 5 is a diagram for explaining various situations in which SA CSI-RS overlaps with sidelink signals according to embodiments of the present invention.

[0090] In FIG. 5, one block may correspond to a slot of NR, but the time resource unit need not be limited thereto. Typically, within a time resource unit, the PSCCH is transmitted on the first predetermined number of symbols, and the PSCCH DMRS may be transmitted via some subcarriers of the symbol on which the PSCCH is transmitted.

[0091] The PSSCH and its corresponding DMRS can be transmitted via subsequent symbols. The example of Fig. 5 illustrates an example in which the DMRS of a PSSCH is transmitted in a symbol surrounding two PSSCHs.

[0092] Depending on the signal mapping relationship in the time-frequency domain, various overlapping situations may occur when SA CSI-RS is additionally transmitted.

[0093] Specifically, reference numeral 510 illustrates a situation in which an SA CSI-RS overlaps with a PSSCH, and illustrates an example in which the SA CSI-RS is transmitted by puncturing the PSSCH of the corresponding region according to the priority relationship described above with respect to FIG. 4.

[0094] Drawing reference numeral 520 illustrates a situation in which an SA CSI-RS overlaps with a PSSCH DMRS region, and whether or not to transmit the SA CSI-RS can be determined based on the number of overlapping resources according to the priority relationship described above with respect to FIG. 4. The example of FIG. 5 illustrates an example in which the SA CSI-RS is transmitted because the number of overlapping resources is less than a threshold.

[0095] Drawing reference numeral 530 illustrates a situation where the SA CSI-RS overlaps with the PSCCH. In this case, if the number of PSCCHs transmitted according to the priority relationship described above with respect to FIG. 4 is greater than a threshold, the SA CSI-RS may be transmitted by puncturing the PSCCH in the corresponding area.

[0096] Finally, reference numeral 540 illustrates a situation where the SA CSI-RS overlaps with the PSCCH DMRS. In this case, according to the priority relationship described above with reference to FIG. 4, the SA CSI-RS is not transmitted (punctured), and the PSCCH DMRS of the corresponding resource region may be transmitted.

[0097]

[0098] FIG. 6 and FIG. 7 are drawings for explaining the concept of AGC related to another embodiment of the present invention.

[0099] Automatic Gain Control (AGC) is a signal that can be used to adjust power at the receiver. Specifically, AGC can be transmitted by repeating information in symbols following the first symbol in a sidelink slot, as illustrated in FIG. 6.

[0100] As illustrated in FIG. 7, in the case of SA CSI-RS, it can additionally be transmitted together with AGC, in which case the AGC can correspond to repeatedly transmitting the symbols of the subsequent SA CSI-RS.

[0101]

[0102] Using this AGC, the receiver can control antenna power gain. However, the additional transmission of this AGC can cause additional overlapping issues with the aforementioned sidelink signals. The following examples specifically examine various overlapping situations related to AGC transmission.

[0103] FIG. 8 is a diagram for explaining an overlap situation with other sidelink signals when transmitting AGC and SA CSI-RS according to embodiments of the present invention.

[0104] In the case of Fig. 8, as in Fig. 5, it is illustrated assuming that a case is followed according to a time-frequency resource mapping rule in which a PSCCH is transmitted in the first predetermined number of symbols within a time resource unit, a PSCCH DMRS is transmitted through some subcarriers of the symbol in which the PSCCH is transmitted, a PSSCH and its DMRS are transmitted through the symbols following this, and the DMRS of the PSSCH is transmitted in symbols surrounding two PSSCHs.

[0105] Specifically, the overlapping items illustrated in Fig. 8 assume the following:

[0106] Drawing number 810: When AGC and SA CSI-RS overlap with PSCCH DMRS,

[0107] Drawing number 820: When AGC overlaps with PSCCH DMRS and SA CSI-RS overlaps with PSCCH,

[0108] Drawing number 830: When AGC overlaps with PSCCH DMRS and SA CSI-RS overlaps with PSSCH DMRS,

[0109] Drawing number 840: When AGC overlaps with PSSCH DMRS and SA CSI-RS overlaps with PSSCH,

[0110] Drawing symbol 850: When AGC overlaps with DMRS of PSCCH and SA CSI-RS overlaps with PSSCH DMRS.

[0111]

[0112] Figures 9 to 13 are drawings for explaining the operation method in each of the various overlapping situations specified in Figure 8.

[0113] Specifically, FIG. 9 illustrates a case (810) where AGC and SA CSI-RS overlap with (1) PSCCH DMRS, and in this case, it is proposed to give priority to (1) PSCCH DMRS having the highest priority and not transmit AGC and SA CSI-RS as illustrated in the drawing reference numeral 910.

[0114] FIG. 10 illustrates a case where AGC overlaps with PSCCH DMRS and SA CSI-RS overlaps with PSCCH (S820). In this case, the UE according to the present embodiment proposes not to transmit AGC and to determine whether to transmit SA CSI-RS based on the number of transmission resources of PSCCH (S1010).

[0115] Specifically, when the number of transmission resources of PSCCH is greater than or equal to a predetermined threshold (X), AGC and SA CSI-RS are not transmitted (S1020), and when the number of transmission resources of PSCCH is less than the predetermined threshold (X), only SA CSI-RS can be transmitted (S1030).

[0116] FIG. 11 illustrates a case where AGC overlaps with PSCCH DMRS and SA CSI-RS overlaps with PSSCH DMRS (830). In this case, the UE according to the present embodiment may not transmit AGC and may determine whether to transmit SA CSI-RS based on the number of resources overlapping with PSSCH DMRS (S1110).

[0117] Specifically, if the number of resources overlapping with the PSSCH DMRS is greater than or equal to a predetermined threshold (Y), AGC and SA CSI-RS are not transmitted (S1120), and if the number of resources overlapping with the PSSCH DMRS is less than the predetermined threshold (Y), only SA CSI-RS can be transmitted (S1130).

[0118] FIG. 12 illustrates a case where AGC overlaps with PSSCH DMRS and SA CSI-RS overlaps with PSSCH (840). In this case, a UE according to the present embodiment may be configured to not transmit AGC but to transmit SA CSI-RS (1210).

[0119] FIG. 13 illustrates a case where AGC overlaps with PSCCH DMRS and SA CSI-RS overlaps with PSSCH DMRS (850). In this case, the UE according to the present embodiment can determine whether to transmit AGC and SA CSI-RS according to the number of resources overlapping with PSSCH DMRS (S1310).

[0120] Specifically, if the number of resources overlapping with the PSSCH DMRS is greater than or equal to a predetermined threshold (Z), AGC and SA CSI-RS may not be transmitted (S1320). Conversely, if the number of resources overlapping with the PSSCH DMRS is less than the predetermined threshold (Z), AGC and SA CSI-RS may not be transmitted (S1330).

[0121] FIG. 14 is a diagram illustrating a case where AGC and SA CSI-RS overlap with PSSCH according to one embodiment of the present invention.

[0122] As illustrated in FIG. 14, when AGC and SA CSI-RS overlap with PSSCH (860), the UE according to the present embodiment can be configured to transmit AGC and SA CSI-RS regardless of whether they overlap.

[0123]

[0124] Figure 15 illustrates a wireless device to which the present technology can be applied.

[0125] Referring to FIG. 15, 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132]

[0133] 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.

[0134] 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.

[0135] The sidelink communication 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 communication between a first user equipment (UE) and a second UE in a mobile communication system, To the second UE, the first stage SCI (Sidelink Control Information) is transmitted through the PSCCH (Physical Sidelink Control Channel); To the second UE, one or more of the second stage SCI or data related to the first stage SCI is transmitted through a PSSCH (Physical Sidelink Shared Channel); Transmitting a PSFCH (Physical Sidelink Feedback Channel) including sidelink feedback information with the second UE; Including transmitting CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management to the second UE, Transmitting the above CSI-RS is Including transmitting a standalone CSI-RS that does not involve data transmission, A sidelink communication method, characterized in that, when the standalone CSI-RS overlaps with one or more of the PSCCH, the PSSCH, or the PSFCH in the time-frequency resource domain, it is determined whether to transmit the standalone CSI-RS based on priority information.

2. In paragraph 1, A sidelink communication method, wherein the priority information for determining whether to transmit the standalone CSI-RS is based on information of the first stage SCI.

3. In paragraph 2, A sidelink communication method wherein the above priority information is based on traffic L1 priority information of the first stage SCI.

4. In paragraph 1, If the standalone CSI-RS overlaps with the DMRS (Demodulation Reference Signal) of the PSCCH, the DMRS of the PSCCH is transmitted, A sidelink communication method for transmitting the standalone CSI-RS when the standalone CSI-RS overlaps with the PSSCH.

5. In paragraph 4, A sidelink communication method in which, when the standalone CSI-RS overlaps with the DMRS of the PSCCH or the PSSCH, whether to transmit the standalone CSI-RS is determined based on the number of transmission resources of the PSCCH or the number of resources overlapping with the DMRS of the PSSCH, respectively.

6. In paragraph 1, Transmitting the above standalone CSI-RS is A sidelink communication method, comprising additionally transmitting AGC (Automatic Gain Control).

7. In paragraph 6, A sidelink communication method in which the AGC and the standalone CSI-RS do not transmit when the AGC and the standalone CSI-RS overlap with the DMRS of the PSCCH.

8. In paragraph 6, If the above AGC overlaps with the DMRS of the PSCCH and the standalone CSI-RS overlaps with the PSCCH, A sidelink communication method in which the above AGC is not transmitted and the standalone CSI-RS is determined whether to be transmitted based on the number of transmission resources of the PSCCH.

9. In paragraph 6, If the above AGC overlaps with the DMRS of the PSCCH and the standalone CSI-RS overlaps with the DMRS of the PSSCH, A sidelink communication method in which the above AGC is not transmitted, and the standalone CSI-RS is determined whether to be transmitted based on the number of resources overlapping with the DMRS of the PSSCH.

10. In paragraph 6, If the above AGC overlaps with the DMRS of the PSSCH and the standalone CSI-RS overlaps with the PSSCH, A sidelink communication method in which the above AGC is not transmitted and the standalone CSI-RS is transmitted.

11. In paragraph 6, If the above AGC overlaps with the DMRS of the PSCCH and the standalone CSI-RS overlaps with the DMRS of the PSSCH, A sidelink communication method for determining whether to transmit the AGC and the standalone CSI-RS according to the number of resources overlapping with the DMRS of the PSSCH.

12. In paragraph 6, When the above AGC and the standalone CSI-RS overlap with the PSSCH, A sidelink communication method for transmitting the above AGC and the above standalone CSI-RS.

13. In paragraph 6, A sidelink communication method in which whether to transmit the above AGC and the standalone CSI-RS is determined based on the TCI (Transmission Configuration Index) status.

14. In a mobile communication system, a first user equipment (UE) performing sidelink 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, To the second UE, the first stage SCI (Sidelink Control Information) is transmitted through the PSCCH (Physical Sidelink Control Channel); To the second UE, one or more of the second stage SCI or data related to the first stage SCI is transmitted through a PSSCH (Physical Sidelink Shared Channel); Transmitting a PSFCH (Physical Sidelink Feedback Channel) including sidelink feedback information with the second UE; Including transmitting CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management to the second UE, Transmitting the above CSI-RS is Including transmitting a standalone CSI-RS that does not involve data transmission, A user device characterized in that, when the standalone CSI-RS overlaps with one or more of the PSCCH, the PSSCH, or the PSFCH in the time-frequency resource domain, it is determined whether to transmit the standalone CSI-RS based on priority information.

Images