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 comprises transmitting, by a first UE to a second UE, a channel status information-reference signal (CSI-RS) for sidelink beam management, wherein the transmitting of the CSI-RS comprises selectively transmitting automatic gain control (AGC) together with the CSI-RS in consideration of a first transmission configuration index (TCI) state of at least one of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH) transmitted to the second UE and a second TCI state of the CSI-RS.

Description

Sidelink communication method and user device therefor

[0001] The following description relates to sidelink, and more specifically, to a method for determining whether to transmit AGC (Automatic Gain Control) to improve reception performance in sidelink communication, and to a user device performing sidelink communication based thereon.

[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 via a PC5 interface, and the link via PC5 can be referred to as a sidelink. In the 5G communication system and its successor next-generation mobile communication, various signals are transmitted in sidelink communication, and in a recent 3GPP standardization meeting, the transmission of AGC to improve reception performance on the sidelink receiving side is being discussed.

[0008] However, the transmission of such AGC may cause problems in the time-frequency domain with various signals that are previously transmitted in sidelink communication, and thus, a discussion on a specific method for determining whether to transmit AGC is necessary.

[0009] In order to solve the above-described problem, one aspect of the present invention proposes a method for determining whether to transmit AGC for improving reception performance in sidelink communication.

[0010] Specifically, we propose to efficiently solve the problem of improved reception performance and resource overlapping by considering the status of the Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) and the Transmission Configuration Index (TCI) of the corresponding CSI-RS in determining whether to transmit AGC corresponding to the CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management.

[0011] In addition, we would like to propose a specific method for performing signaling to the receiver regarding whether to transmit AGC as described above.

[0012] In addition, in another aspect of the present invention, a user device for implementing the methods described above is proposed.

[0013] 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.

[0014] 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 is proposed, the method including transmitting a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management to the second UE, wherein transmitting the CSI-RS includes selectively transmitting an AGC (Automatic Gain Control) together with the CSI-RS in consideration of a first TCI (Transmission Configuration Index) state of at least one of a PSCCH (Physical Sidelink Control Channel) or a PSSCH (Physical Sidelink Shared Channel) transmitted to the second UE and a second TCI state of the CSI-RS.

[0015] If the first TCI state and the second TCI state are the same or have a difference less than a predetermined standard, the AGC is not transmitted, and if the first TCI state and the second TCI state have a difference greater than the predetermined standard, the AGC can be transmitted.

[0016] It is preferable that the above CSI-RS be grouped, and whether or not the AGC is transmitted can be signaled based on the group of the corresponding CSI-RS.

[0017] Whether or not to transmit the above AGC can be signaled via one or more of an RRC (Radio Resource Control) message or a MAC (Medium Access Control) CE (Control Element).

[0018] Specifically, the MAC CE may include a group ID field of the CSI-RS; and a TCI status field within the group of the CSI-RS, and may indicate whether the AGC is transmitted according to the group ID of the CSI-RS.

[0019] Additionally, the MAC CE may include a group ID field of the CSI-RS; a TCI status field within the group of the CSI-RS; a field indicating activation or deactivation of the CSI-RS; and a field indicating activation or deactivation of the AGC.

[0020] Additionally, the MAC CE may include a field indicating activation or deactivation of the CSI-RS; a field indicating activation or deactivation of the AGC; a resource set ID field of the CSI-RS; and an ID field of the TCI state.

[0021] Meanwhile, in another aspect of the present invention, a method for performing sidelink communication between a first user equipment (UE) and a second UE in a mobile communication system is proposed, the method comprising: considering a first Transmission Configuration Index (TCI) state of at least one of a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH) transmitted to the second UE and a second TCI state of the CSI-RS; determining whether to transmit to the second UE at least one of a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management and an AGC (Automatic Gain Control) corresponding to the CSI-RS, depending on whether there is a difference between the first TCI state and the second TCI state; and transmitting at least one of the CSI-RS and the AGC to the second UE based on a result of the determination.

[0022] At this time, if the first TCI state and the second TCI state are the same or have a difference less than a predetermined standard, the CSI-RS and the AGC are not transmitted, and if the first TCI state and the second TCI state have a difference greater than the predetermined standard, the CSI-RS and the AGC can be transmitted.

[0023] Whether to transmit the CSI-RS and the AGC, or a combination thereof, may be signaled through one or more of an RRC (Radio Resource Control) message or a MAC (Medium Access Control) CE (Control Element).

[0024] Meanwhile, in another aspect of the present invention, a first user equipment (UE) performing sidelink communication with a second UE in a mobile communication system is provided, the 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, wherein the operations include transmitting, to the second UE, a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management, wherein transmitting the CSI-RS includes selectively transmitting an AGC (Automatic Gain Control) together with the CSI-RS in consideration of a first TCI (Transmission Configuration Index) state of at least one of a PSCCH (Physical Sidelink Control Channel) or a PSSCH (Physical Sidelink Shared Channel) transmitted to the second UE and a second TCI state of the CSI-RS.

[0025] In another aspect of the present invention, 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: considering a first Transmission Configuration Index (TCI) state of at least one of a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH) transmitted to the second UE and a second TCI state of the CSI-RS; and determining, based on whether there is a difference between the first TCI state and the second TCI state, whether to transmit to the second UE at least one of a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management and an AGC (Automatic Gain Control) corresponding to the CSI-RS; And, we propose a user device that includes transmitting one or more of the CSI-RS and the AGC to the second UE according to the decision result.

[0026] According to the embodiments of the present invention as described above, it is possible to efficiently determine whether to transmit AGC for improving reception performance in sidelink communication.

[0027] Specifically, by considering the TCI status of the PSCCH / PSSCH and the corresponding CSI-RS in determining whether to transmit AGC corresponding to the CSI-RS for sidelink beam management, the problems of improved reception performance and resource overlap can be efficiently solved.

[0028] Additionally, signaling can be performed to the receiver as appropriate for the situation regarding whether or not to transmit AGC as described above.

[0029] 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.

[0030] Figure 1 shows the structure of a system for 5G communication.

[0031] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0032] FIG. 3 and FIG. 4 are drawings for explaining the concept of AGC related to one embodiment of the present invention.

[0033] FIG. 5 is a diagram for explaining a method for determining whether to transmit AGC according to one embodiment of the present invention.

[0034] FIG. 6 is a drawing for explaining a method for determining whether to transmit AGC according to another embodiment of the present invention.

[0035] FIG. 7 and FIG. 8 are diagrams for explaining an example of a resource block that transmits a sidelink signal by determining whether to transmit AGC according to one embodiment of the present invention.

[0036] FIGS. 9 to 12 are diagrams illustrating formats of MAC CE according to embodiments of the present invention.

[0037] Figure 13 illustrates a wireless device to which the present technology can be applied.

[0038] 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.

[0039] 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.

[0040]

[0041] As described above, one aspect of the present invention proposes a method for determining whether to transmit AGC to improve reception performance in sidelink communications. To this end, we first examine the channels available for sidelink communications.

[0042] FIG. 2 is a diagram illustrating a procedure for performing sidelink communication according to one embodiment of the present invention.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] [Table 1] shows an example of DCI for SL scheduling.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054]

[0055] FIG. 3 and FIG. 4 are drawings for explaining the concept of AGC related to one embodiment of the present invention.

[0056] 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. 3.

[0057] Figure 4 specifically shows the transmission form of AGC for CSI-RS.

[0058] 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.

[0059] CSI-RS used for sidelink communication may include NSA (Non-Standalone) CSI-RS and SA CSI-RS.

[0060] NSA CSI-RS is a CSI-RS transmitted together with data (PSSCH) to be transmitted by the UE, and SA CSI-RS can be viewed as a CSI-RS transmitted for purposes such as beam management when the UE has no data to be transmitted together.

[0061] The area in which SA CSI-RS is transmitted has not yet been specifically defined, but it can be transmitted in a form as shown in Fig. 4.

[0062] As illustrated in FIG. 4, 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.

[0063] Using this AGC, the receiver can control the antenna power gain. However, the additional transmission of this AGC may cause an overlap problem with the sidelink signals described above in relation to FIG. 2, as it uses the entire frequency range of one symbol, as illustrated in FIG. 4. In the embodiments below, we propose a method for determining whether to transmit AGC by considering these advantages and disadvantages.

[0064]

[0065] Decision on whether to transmit AGC

[0066] FIG. 5 is a diagram for explaining a method for determining whether to transmit AGC according to one embodiment of the present invention.

[0067] As illustrated in FIG. 5, the first UE can transmit a CSI-RS for sidelink beam management to the second UE (S510). At this time, in the present embodiment, the first UE transmits the CSI-RS (S510) by considering the first TCI (Transmission Configuration Index) state of at least one of the PSCCH or PSSCH transmitted to the second UE and the second TCI state of the CSI-RS (S520), and selectively transmits AGC together with the CSI-RS (S530).

[0068] At this time, the TCI status can be viewed as information indicating whether two antenna ports in a QCL (Quasi-Colocation) relationship are configured to transmit the same RS (Reference Signal). At this time, the QCL relationship indicates a relationship in which two antenna ports have the same macroscopic channel characteristics, and in 3GPP, antenna ports with different RSs can be set to a QCL relationship and notified to the UE.

[0069] [Table 2] below shows the QCL relationship specified by 3GPP.

[0070] QCL TypePropertyApplicationQCL - TypeADoppler shift, Doppler spread, average delay, delay spreadObtain channel state info.QCL - TypeBDoppler shift, Doppler spreadObtain channel state info.QCL - TypeCDoppler shift, Doppler aaverageObtain channel state info.QCL - TypeDSpatial Rx parameterSupport Beamforming

[0071] In the above [Table 2], QCL-Type D is particularly used for beam management, and when the TCI states set to QCL-Type D are the same, RS is transmitted through the same beam, and when the TCI states set to QCL-Type D are different, RS is transmitted through different beams.

[0072] That is, if the TCI status is the same or has a difference less than a predetermined standard, the two signals can be viewed as transmitting RSs through the same beam, and considering this, the present embodiment proposes to determine whether to transmit AGC.

[0073] Specifically, in one embodiment of the present invention, if the TCI state (first TCI state) of PSCCH / PSSCH and the TCI state (second TCI state) of CSI-RS are the same or have a difference less than a predetermined standard, the two signals are considered to use the same / similar RS, and thus the AGC is not transmitted. If the first TCI state and the second TCI state have a difference greater than a predetermined standard, the AGC is proposed to be transmitted.

[0074]

[0075] FIG. 6 is a drawing for explaining a method for determining whether to transmit AGC according to another embodiment of the present invention.

[0076] In this embodiment, a method is proposed to determine whether to transmit one or more of a CSI-RS for sidelink beam management and an AGC corresponding to the CSI-RS, considering the first TCI state of one or more of a PSCCH or PSSCH transmitted by a first UE to a second UE and the second TCI state of a CSI-RS (S610). Fig. 6 illustrates a concept of differently / selectively determining whether to transmit or not the entire combination of AGC and CSI-RS depending on whether the TCI states are the same among these embodiments.

[0077] Specifically, in the case where the first TCI state and the second TCI state are the same (S610), the embodiment of FIG. 6 illustrates not transmitting AGC and CSI-RS (disabling transmission) (S620), and in the case where the first TCI state and the second TCI state are different, transmitting AGC and CSI-RS (enabling transmission) (S630).

[0078] In this way, a reasonable standard can be established between the improvement in reception performance due to AGC transmission and the increased possibility of resource overlap.

[0079]

[0080] FIG. 7 and FIG. 8 are diagrams for explaining an example of a resource block that transmits a sidelink signal by determining whether to transmit AGC according to one embodiment of the present invention.

[0081] In FIGS. 7 and 8, 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, a PSCCH is transmitted on the first predetermined number of symbols, and a PSCCH DMRS may be transmitted via some subcarriers of the symbol in which the PSCCH is transmitted.

[0082] The PSSCH and its corresponding DMRS can be transmitted via subsequent symbols. Examples (710, 810) of FIGS. 7 and 8 illustrate an example in which the DMRS of a PSSCH is transmitted in symbols surrounding two PSSCHs.

[0083] Depending on the signal mapping relationship in the time-frequency domain, various overlapping situations may occur when (SA) CSI-RS and its corresponding AGC are additionally transmitted.

[0084] Specifically, drawings 720 and 820 illustrate a situation in which the SA CSI-RS overlaps with the PSSCH and the AGC overlaps with the DMRS of the PSSCH.

[0085] In one embodiment of the present invention, as described above with respect to FIG. 5, it is proposed to determine whether to transmit AGC by comparing the TCI state of a sidelink signal such as PUCCH / PUSCH and the TCI state of a CSI-RS, and in FIG. 7, reference numeral 710 illustrates a case where the TCI states are the same and AGC is not transmitted, and reference numeral 720 illustrates a case where the TCI states are different and AGC is transmitted by puncturing a PSSCH region.

[0086] In addition, in another embodiment of the present invention, as described above with respect to FIG. 6, it is proposed to compare the TCI state of a sidelink signal such as PUCCH / PUSCH and the TCI state of CSI-RS to determine whether to transmit AGC and the corresponding CSI-RS, and reference numeral 810 of FIG. 8 illustrates a case where the TCI states are the same and AGC and CSI-RS are not transmitted, and reference numeral 820 illustrates a case where the TCI states are different and AGC and CSI-RS are transmitted by puncturing the PSSCH DMRS region and the PSSCH region, respectively.

[0087]

[0088] Signaling whether AGC is transmitted

[0089] As described above, whether to transmit AGC (and CSI-RS) can be determined differently by considering the TCI status, and it is desirable for the transmitting UE to signal to the receiving UE whether to transmit AGC.

[0090] For efficient signaling, one embodiment of the present invention assumes that the CSI-RSs are grouped, and proposes that whether or not to transmit AGC is signaled based on the group of corresponding CSI-RSs.

[0091] Specifically, a CSI-RS group can be set, and whether AGC is to be transmitted can be signaled through higher-level signaling (e.g., RRC signaling) of the corresponding information. At this time, whether AGC is to be transmitted can be implicitly set based on a TCI state ID or a CSI-RS resource ID.

[0092] As an example, grouping may be performed by designating a CSI-RS having an even TCI state ID (CSI-RS resource ID) as group 0 and a CSI-RS having an odd TCI state ID (CSI-RS resource ID) as group 1, and based on this, whether or not to transmit AGC may be signaled.

[0093] As another example, grouping can be performed by designating CSI-RSs having TCI state IDs (CSI-RS resource IDs) from 1 to n as group 0, and designating n+1 to N as group 1, and signaling whether to transmit AGC based on this.

[0094] As another example, the number of groups G is predetermined, and the group ID g can be set as follows.

[0095] [Mathematical Formula 1]

[0096] g = mod(TCI-State ID, G)

[0097] [Equation 2]

[0098] g = mod(CSI-RS resource ID, G)

[0099] As another example, the number of groups G is predetermined, and the number of elements in the group N g , and you can also set up groups as follows.

[0100] [Equation 3]

[0101] g1∋ {TCI-State(CSI-RS resource) #1, TCI-State(CSI-RS resource) #2,… , TCI-State(CSI-RS resource) #N g}

[0102] [Equation 4]

[0103] g2∋ {TCI-State(CSI-RS resource) #(N g +1), TCI-State(CSI-RS resource) #(N g +2),… , TCI-State(CSI-RS resource) #2N g}

[0104]

[0105] As another example, the CSI-RS group ID can be explicitly set for each TCI state ID or CSI-RS resource ID. Specifically, the CSI-RS resource ID and CSI-RS group ID can be set simultaneously for each CSI-RS. Furthermore, CSI-RS grouping can be performed in the following manner.

[0106] [Equation 5]

[0107] CSI-RS Group #K

[0108] CSI-RS resource #1, CSI-RS resource #2,… , CSI-RS resource #N

[0109]

[0110] Meanwhile, in another embodiment of the present invention, it is proposed to perform AGC activation / deactivation through MAC CE based on CSI-RS group information.

[0111] To achieve this, implicit activation / deactivation can be performed on a group-by-group basis. For example, if the group is the same as the currently used CSI-RS, AGC can be disabled, and otherwise enabled. Alternatively, explicit activation / deactivation of AGC transmission can also be instructed on a group-by-group basis.

[0112]

[0113] FIGS. 9 to 12 are diagrams illustrating formats of MAC CE according to embodiments of the present invention.

[0114] First, the MAC CE illustrated in FIG. 9 may include a group ID field (910) of the CSI-RS and a TCI state field(s) (920) within the group of the CSI-RS. Here, the TCI state field(s) (920) may indicate a TCI state ID for a resource within the corresponding SP (Sidelink Physical) NZP (Non-Zero-Power) CSI-RS group.

[0115] Using this MAC CE, it is possible to indicate whether AGC is transmitted or not according to the group ID of the CSI-RS.

[0116] Next, the MAC CE illustrated in FIG. 10 includes a group ID field (1010) of the CSI-RS, and TCI status field(s) (1040) within the group of the CSI-RS, as in FIG. 9. However, the MAC CE according to the example of FIG. 10 may additionally include a field (1020) indicating activation or deactivation of the CSI-RS, and a field (1030) indicating activation or deactivation of the AGC. When utilizing such a MAC CE, the CSI-RS / AGC for each CSI-RS group can be individually activated / deactivated.

[0117] Next, the MAC CE illustrated in FIGS. 11 and 12 may include a field (1110) indicating activation / deactivation of CSI-RS, a field (1120) indicating activation / deactivation of AGC, a CSI-RS resource set ID field (1130), and TCI state ID field(s) (1140). At this time, the field (1120) indicating activation / deactivation of AGC may have a size of N bits, and each bit of information may be set to indicate activation / deactivation of AGC of the corresponding CSI-RS. In the case of FIG. 11, the form in which the field (1120) indicating activation / deactivation of AGC of this N bit size is arranged continuously is illustrated, and in the case of FIG. 12, the form in which the field (1120) indicating activation / deactivation of AGC of this N bit size is arranged in a distributed manner is illustrated.

[0118]

[0119] Figure 13 illustrates a wireless device to which the present technology can be applied.

[0120] 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. 5, respectively.

[0121] 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.

[0122] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may store software code including commands for performing some or all of the processes controlled by the processor (202) or performing the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127]

[0128] 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.

[0129] 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.

[0130] 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 signal management to improve reception performance 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, Including transmitting CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management to the second UE, Transmitting the above CSI-RS is A sidelink communication method, comprising selectively transmitting AGC (Automatic Gain Control) together with the CSI-RS, taking into consideration a first TCI (Transmission Configuration Index) state of at least one of a PSCCH (Physical Sidelink Control Channel) or a PSSCH (Physical Sidelink Shared Channel) transmitted to the second UE and a second TCI state of the CSI-RS.

2. In paragraph 1, If the first TCI state and the second TCI state are the same or have a difference less than a predetermined standard, the AGC is not transmitted. A sidelink communication method for transmitting the AGC when the first TCI state and the second TCI state have a difference greater than or equal to the predetermined standard.

3. In paragraph 1, The above CSI-RSs are grouped, A sidelink communication method in which whether or not to transmit the above AGC is signaled based on a group of corresponding CSI-RSs.

4. In paragraph 1, A sidelink communication method in which whether or not to transmit the above AGC is signaled through one or more of an RRC (Radio Resource Control) message or a MAC (Medium Access Control) CE (Control Element).

5. In paragraph 4, The above MAC CE is, The group ID field of the above CSI-RS; and Contains a TCI status field within the group of the above CSI-RS, A sidelink communication method that indicates whether or not to transmit the AGC according to the group ID of the CSI-RS.

6. In paragraph 4, The above MAC CE is, Group ID field of the above CSI-RS; TCI status field within the group of the above CSI-RS; A field indicating activation or deactivation of the CSI-RS; and A sidelink communication method comprising a field indicating activation or deactivation of the above AGC.

7. In paragraph 4, The above MAC CE is, A field indicating activation or deactivation of the above CSI-RS; A field indicating activation or deactivation of the above AGC; The resource set ID field of the above CSI-RS; and A sidelink communication method including an ID field of the above TCI state.

8. In a method for performing sidelink communication between a first user equipment (UE) and a second UE in a mobile communication system, Considering at least one first Transmission Configuration Index (TCI) state of a PSCCH (Physical Sidelink Control Channel) or a PSSCH (Physical Sidelink Shared Channel) transmitted to the second UE and a second TCI state of the CSI-RS; Depending on whether there is a difference between the first TCI state and the second TCI state, it is determined whether to transmit to the second UE at least one of a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management and an AGC (Automatic Gain Control) corresponding to the CSI-RS; and A sidelink communication method, comprising transmitting one or more of the CSI-RS and the AGC to the second UE according to a decision result.

9. In paragraph 8, If the first TCI state and the second TCI state are the same or have a difference less than a predetermined standard, the CSI-RS and the AGC are not transmitted. A sidelink communication method for transmitting the CSI-RS and the AGC when the first TCI state and the second TCI state have a difference greater than or equal to the predetermined standard.

10. In paragraph 8, A sidelink communication method, wherein whether to transmit each or a combination of the CSI-RS and the AGC is signaled through at least one of an RRC (Radio Resource Control) message or a MAC (Medium Access Control) CE (Control Element).

11. 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, Including transmitting CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management to the second UE, Transmitting the above CSI-RS is A user equipment, comprising: selectively transmitting AGC (Automatic Gain Control) together with the CSI-RS, considering at least one first TCI (Transmission Configuration Index) state of a PSCCH (Physical Sidelink Control Channel) or PSSCH (Physical Sidelink Shared Channel) transmitted to the second UE and a second TCI state of the CSI-RS.

12. 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, Considering at least one first Transmission Configuration Index (TCI) state of a PSCCH (Physical Sidelink Control Channel) or a PSSCH (Physical Sidelink Shared Channel) transmitted to the second UE and a second TCI state of the CSI-RS; Depending on whether there is a difference between the first TCI state and the second TCI state, it is determined whether to transmit to the second UE at least one of a CSI-RS (Channel Status Information - Reference Signal) for sidelink beam management and an AGC (Automatic Gain Control) corresponding to the CSI-RS; and A user device comprising transmitting one or more of the CSI-RS and the AGC to the second UE according to a decision result.

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