Direct communication method for feedback channel collision avoidance and user equipment therefor

Abstract

Provided are a method for performing direct communication in a mobile communication system, and user equipment therefor. To this end, a method by which a first user equipment (UE) performs direct communication with a second UE and a third UE comprises: receiving a first direct communication beam from the second UE; receiving a second direct communication beam from the third UE; determining a physical layer feedback channel resource region in which at least one of first feedback information for the first direct communication beam or second feedback information for the second direct communication beam is to be transmitted; and transmitting at least one of the first feedback information or the second feedback information through the determined physical layer feedback channel resource region.

Description

Direct communication method for avoiding feedback channel collision and user device therefor

[0001] This specification relates to direct communication between user devices. Specifically, it relates to a direct communication method for feedback channel collision avoidance 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 illustrates the structure of a system for 5th generation (5G) communication.

[0004] Referring to FIG. 1, a next generation radio access network (NG-RAN) may include a base station (BS) (20) that provides user plane and control plane protocol termination to a user equipment (UE) (10).

[0005] The example of Fig. 1 illustrates a case including only gNB. BSs (20) can be connected to each other via Xn interfaces. BSs (20) can be connected to a 5th generation core network (5GC) via an NG interface. Specifically, BSs (20) can be connected to an access and mobility management function (AMF) (30) via an NG-C interface, and can be connected to a user plane function (UPF) (30) via an NG-U interface.

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

[0007] [Table 1]

[0008] [Correction pursuant to Rule 91 dated 22.01.2025]

[0009] In the above table, KsCSI-RS is a variable indicating the number of Channel State Information Reference Signal (CSI-RS) resources in the corresponding resource set. This UCI can transmit tens to hundreds of bits of information, enabling beam management.

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

[0011] In a mobile communication system, a UE that has received direct communication data channel(s) from other user equipment (UE)(s) can transmit feedback(s) therefor through a physical layer feedback channel (e.g., PSFCH (Physical Sidelink Feedback Channel).

[0012] Different UEs can transmit and receive direct communication data channels using different beams. Therefore, when a UE receives direct communication data channels from multiple different UEs and transmits a corresponding feedback channel, a feedback collision problem may occur.

[0013] To solve these problems, we propose a method for UE(s) to perform direct communication in a mobile communication system and a UE for the same.

[0014] Specifically, when a feedback collision problem occurs when a UE directly communicating with different UE(s) in a mobile communication system transmits a feedback channel through different beams, a new method is required for determining a feedback channel transmission beam.

[0015] The technical tasks that this specification aims to achieve are not limited to the technical tasks mentioned above, and other technical tasks that are not mentioned will be clearly understood by those skilled in the art related to this specification from the detailed description below.

[0016] In one aspect of the present specification, a method for a first user equipment (UE) to perform direct communication with a second UE and a third UE in a mobile communication system is provided. The method includes receiving a first direct communication beam from the second UE, receiving a second direct communication beam from the third UE, determining a physical layer feedback channel resource region for transmitting at least one of first feedback information for the first direct communication beam or second feedback information for the second direct communication beam, and transmitting at least one of the first feedback information or the second feedback information through the determined physical layer feedback channel resource region, wherein determining the physical layer feedback channel resource region includes determining whether a first resource region for transmitting the first feedback information and a second resource region for transmitting the second feedback information overlap, and selecting feedback information to be transmitted based on the overlap between the first resource region and the second resource region, according to priorities of the first feedback information and the second feedback information.

[0017] In another aspect of the present specification, a first user equipment (UE) is provided that performs direct communication with a second UE and a third UE in a mobile communication system. The first UE comprises at least one processor; at least one transceiver; And at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including: receiving a first direct communication beam from the second UE, receiving a second direct communication beam from the third UE, determining a physical layer feedback channel resource region for transmitting at least one of first feedback information for the first direct communication beam or second feedback information for the second direct communication beam, and transmitting at least one of the first feedback information or the second feedback information through the determined physical layer feedback channel resource region, wherein determining the physical layer feedback channel resource region includes determining whether a first resource region for transmitting the first feedback information and a second resource region for transmitting the second feedback information overlap, and selecting feedback information to be transmitted according to a priority of the first feedback information and the second feedback information based on the overlap between the first resource region and the second resource region.

[0018] In each aspect of the present specification, receiving first L1 priority information of a first data channel received via the first direct communication beam may include receiving second L1 priority information of a second data channel received via the second direct communication beam.

[0019] The selection of the feedback information to be transmitted may be based on the first L1 priority information and the second L1 priority information.

[0020] In each aspect of the present specification, receiving the first direct communication beam may include receiving first HARQ priority information of a first data channel received through the first direct communication beam, and receiving the second direct communication beam may include receiving second HARQ priority information of a second data channel received through the second direct communication beam.

[0021] The first HARQ priority information and the second HARQ priority information may be determined by considering at least one of whether the QoS (Quality of Service) of the first data channel and the second data channel prioritizes reliability or is sensitive to delay.

[0022] The selection of the feedback information to be transmitted may be based on the first HARQ priority information and the second HARQ priority information.

[0023] In addition, receiving the first direct communication beam and the second direct communication beam includes receiving first L1 priority information and second L1 priority information received through the first direct communication beam and the second direct communication beam, respectively, and selecting the feedback information to be transmitted may additionally be selecting based on the first L1 priority information and the second L1 priority information.

[0024] The above problem solving methods are only some of the examples of this specification, and various examples reflecting the technical features of this specification can be derived and understood by a person having ordinary knowledge in the relevant technical field based on the detailed description below.

[0025] According to some implementations of this specification, a method is provided for determining a feedback channel transmission beam when transmitting multiple feedback channels via different beams. Based on this, a user equipment (UE) can efficiently perform direct communication with other UE(s).

[0026] According to some implementations of this specification, communication delays due to feedback collisions can be efficiently prevented.

[0027] The effects obtained from the present invention may not be limited to the effects described above. Furthermore, other effects not mentioned can be clearly understood by those skilled in the art from the following description.

[0028] The accompanying drawings, which are included as part of the detailed description to aid in understanding implementations of this specification, provide examples of implementations of this specification and, together with the detailed description, serve to illustrate implementations of this specification.

[0029] Figure 1 illustrates the structure of a system for 5th generation (5G) communication.

[0030] FIG. 2 illustrates a procedure for performing sidelink communication according to some implementations of this specification.

[0031] Figure 3 illustrates a flowchart of a method for performing direct communication according to some implementations of this specification.

[0032] FIG. 4 is a diagram illustrating a case where a user equipment (UE) performs direct communication with different UEs simultaneously according to some implementations of the present specification.

[0033] FIG. 5 illustrates an example of a method for preventing beam collisions according to some implementations of the present specification.

[0034] FIG. 6 is a block diagram illustrating examples of communication devices capable of performing a method according to the present specification.

[0035] Hereinafter, implementations according to this specification will be described in detail with reference to the attached drawings. The detailed description provided below, together with the attached drawings, is intended to describe exemplary implementations of this specification and is not intended to represent the only possible implementations of this specification. The detailed description below includes specific details to provide a thorough understanding of this specification. However, one of ordinary skill in the art will appreciate that this specification may be practiced without these specific details.

[0036] In some cases, to avoid ambiguity in the concepts of this specification, known structures and devices may be omitted or illustrated in block diagram form focusing on the core functions of each structure and device. Throughout this specification, identical components are described using the same reference numerals.

[0037] The terms and words used in the following description and drawings should not be interpreted as limited to their conventional or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​this specification based on the principle that the inventor can appropriately define the concept of the term to best describe his or her invention. Therefore, the examples described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of this specification and do not represent all of the technical idea of ​​this specification. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0038] Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0039] The terminology used in this specification is only used to describe specific embodiments and is not intended to limit the features, components, etc. described in the specification. The singular expression includes plural expressions unless the context clearly indicates otherwise. It should be understood that the terms "comprises" or "has" described in this specification are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0040] Additionally, in various embodiments of the present specification, " / " and "," should be interpreted as indicating "and / or". For example, "A / B" can mean "A and / or B". Furthermore, "A, B" can mean "A and / or B". Furthermore, "A / B / C" can mean "at least one of A, B, and / or C". Furthermore, "A, B, C" can mean "at least one of A, B, and / or C".

[0041] Additionally, terms that include ordinal numbers, such as "first," "second," etc., are used to describe various components and are only used to distinguish one component from another, not to limit said components. For example, without exceeding the scope of this specification, a second component could be referred to as a first component, and similarly, a first component could also be referred to as a second component.

[0042] The techniques, devices, and systems described below can be applied to various wireless multiple access systems. Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency division multiple access (SC-FDMA) systems. CDMA can be implemented in radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented in radio technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of UMTS (Universal Mobile Telecommunications System), and 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA. 3GPP LTE adopts OFDMA for the downlink (DL) and SC-FDMA for the uplink (UL).LTE-A (Advanced) is an evolved form of 3GPP LTE, and 3GPP NR (New Radio or New Radio Access Technology) is an evolved form of 3GPP LTE / LTE-A.

[0043] For terms and technologies used in this specification that are not specifically explained, reference can be made to 3GPP-based standard documents.

[0044] In the examples of this specification described below, the expression "assumes" that a device "assumes" that the entity transmitting the channel transmits the channel in a manner consistent with the "assume." The entity receiving the channel may mean that, under the assumption that the channel was transmitted in a manner consistent with the "assume," the entity receiving the channel receives or decodes the channel in a manner consistent with the "assume."

[0045] In this specification, user equipment (UE) may be fixed or mobile, and includes various devices that communicate with a base station (BS) to transmit and / or receive user data and / or various control information. UE may be called Terminal Equipment (TE), Mobile Station (MS), Mobile Terminal (MT), User Terminal (UT), Subscriber Station (SS), wireless device, Personal Digital Assistant (PDA), wireless modem, handheld device, etc. In addition, in this specification, BS generally refers to a fixed station that communicates with UE and / or other BS, and exchanges various data and control information by communicating with UE and other BS. BS may be called by other terms such as Advanced Base Station (ABS), Node-B (NB), evolved-NodeB (eNB), Base Transceiver System (BTS), Access Point, and Processing Server (PS). In particular, the BS in UTRAN is called a Node-B, the BS in E-UTRAN is called an eNB, and the BS in a new radio access technology network is called a gNB. For convenience of explanation, the base station is referred to as a BS below, regardless of the type or version of communication technology.

[0046] For convenience of explanation, the following description assumes that this specification applies to 3GPP-based communication systems, such as LTE and NR. However, the technical features of this specification are not limited to this. For example, although the detailed description below is based on a mobile communication system corresponding to a 3GPP LTE / NR system, it can also be applied to any other mobile communication system, except for features specific to 3GPP LTE / NR.

[0047] Therefore, the term sidelink (SL) used in 5G can be referred to as a 'direct communication link' between UEs, and terms such as PSSCH (Physical Sidelink Shared Channel) and PSFCH (Physical Sidelink Feedback Channel), which correspond to the data channels used in 5G, can be referred to as 'direct communication data channel', 'physical layer feedback channel', etc. In this case, the 'physical layer feedback channel' refers to a physical layer channel used for HARQ feedback transmission between UEs, and can be used to distinguish it from a feedback channel through MAC (Medium Access Control) CE (Control Element) through which feedback information for beam management is transmitted in parallel.

[0048] FIG. 2 illustrates a procedure for performing sidelink communication according to some implementations of this specification.

[0049] The embodiment of FIG. 2 can be combined with various embodiments of the present specification. In this specification, a "transmission mode" may be referred to as a "mode" or a "resource allocation mode." Hereinafter, for convenience of explanation, the transmission mode in LTE is referred to as the LTE transmission mode, and the transmission mode in NR is referred to as the NR resource allocation mode.

[0050] Specifically, (a) of FIG. 2 illustrates the operation of a UE 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 the operation of the UE 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 BS may schedule SL resources to be used by the UE for SL transmission (S8000). For example, the BS 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 BS.

[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 (BS). 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 BS 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 BS configures / allocates to the first UE via DCI and / or an RRC message. For example, in the case of a CG type 1 resource, a BS 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, a BS can transmit an RRC message including information related to the CG resource to the first UE, and the BS 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 BS via a PUCCH or a PUSCH. For example, the HARQ feedback information reported to the BS 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 BS 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] The table below shows an example of DCI for scheduling SL.

[0056] 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.

[0057]

[0058] 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 BS / 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.

[0059] 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.

[0060] 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.

[0061] According to some implementations of this specification, based on the communication method described above, a UE can transmit HARQ feedback information for a PSSCH via a PSFCH. This specification proposes a method for a UE to transmit HARQ feedback information for a PSSCH via a PSFCH, while determining a PSFCH transmission beam to resolve feedback collision issues.

[0062] Figure 3 illustrates a flowchart of a method for performing direct communication according to some implementations of this specification.

[0063] Referring to FIG. 3, a first UE can receive a first direct communication beam from a second UE (S310). Furthermore, the first UE can receive a second direct communication beam from a third UE (S320). In other words, the first UE can receive data channels from different second UEs and third UEs through the first direct communication beam and the second direct communication beam, respectively (S310 to S320). The first UE can determine a physical layer feedback channel resource region to transmit at least one of first feedback information for the first direct communication beam or second feedback information for the second direct communication beam (S330). In S330, the first UE determines whether a first resource region to transmit the first feedback information and a second resource region to transmit the second feedback information overlap, and based on the overlap between the first resource region and the second resource region, feedback information to be transmitted can be selected according to the priority of the first feedback information and the second feedback information. In addition, the first UE can transmit at least one of the first feedback information or the second feedback information through the determined physical layer feedback channel resource region.

[0064] Here, the selection of feedback information to be transmitted may be based on the first L1 priority information of the first data channel and the second L1 priority information of the second data channel, which are received through the first direct communication beam and the second direct communication beam, respectively.

[0065] Alternatively, the selection of feedback information to be transmitted may be based on the first HARQ priority information of the first data channel and the second HARQ priority information of the second data channel, which are received through the first direct communication beam and the second direct communication beam, respectively.

[0066] The physical layer feedback channel may be a channel corresponding to the PSFCH among the channels related to FIG. 2. In this specification, a method is proposed for determining a PSFCH transmission beam when a UE receives PSCCHs / PSSCHs from multiple different UEs via different beams and a PSFCH transmission collision occurs while transmitting the corresponding PSFCHs. A specific method for UEs to perform direct communication based on this method is described below.

[0067] According to some implementations of this specification, a single receiving UE (Rx UE) can communicate simultaneously with multiple transmitting UEs (Tx UEs) having different beams. For example, a single receiving UE may communicate simultaneously with M transmitting UEs having different beams.

[0068] FIG. 4 is a diagram illustrating a case where a user equipment (UE) performs direct communication with different UEs simultaneously according to some implementations of the present specification.

[0069] Referring to FIG. 4, there may be cases where one receiving UE (Rx) and multiple different transmitting UEs (Tx 1 and Tx 2) must simultaneously transmit and receive PSFCH, and different beams may be used between different UEs.

[0070] For example, Rx may receive data (e.g., PSSCH) from Tx 1 and transmit a physical layer feedback channel (e.g., PSFCH) corresponding thereto. Simultaneously, Rx may receive data (e.g., PSSCH) from Tx 2 and transmit a physical layer feedback channel (e.g., PSFCH) corresponding thereto.

[0071] FIG. 5 illustrates an example of a method for preventing beam collisions according to some implementations of the present specification.

[0072] Referring to FIG. 5, as described in FIG. 4, a single receiving UE (Rx UE) can simultaneously transmit and receive a direct communication data channel with a plurality of transmitting UEs (Tx 1 and Tx 2). In this case, a transmission collision may occur between a feedback channel for data (e.g., PSCCH / PSSCH) received from Tx 1 and a feedback channel for data (e.g., PSCCH / PSSCH) received from Tx 2. At this time, since Tx 1 and Tx 2 cannot know at what timing the data (e.g., PSCCH / PSSCH) was transmitted to Rx, a problem may arise in that Rx must determine a transmission beam of a feedback channel (e.g., PSFCH) for feedback on the data (e.g., PSCCH / PSSCH). In other words, a resource region for transmitting feedback information for data received from Tx 1 and a resource region for transmitting feedback information for data received from Tx 2 may overlap. At this time, a problem may arise where Rx must decide / select what feedback information to transmit for the data(s) received.

[0073] According to some implementations of this specification, in this case, the Rx may determine the feedback channel transmission beam based on priority information (e.g., L1-priority information and / or HARQ priority information that determines the priority of signals and / or channels in the physical layer) of data (e.g., PSCCH / PSSCH) received from Tx 1 and Tx 2 through different beams, respectively. In this specification, the priority of data and / or data channel may also be referred to as the priority of feedback information for the corresponding data and / or data channel.

[0074] Specifically, when a PSFCH transmission collision occurs, a receiving UE (Rx UE) can determine a PSFCH transmission beam based on traffic L1 priority information of a data channel (e.g., PSSCH) received directly from multiple transmitting UEs (Tx UEs) through respective communication beams. The receiving UE (Rx UE) can determine a PSFCH transmission beam based on the traffic L1 priority of the 1st-stage SCI.

[0075] For example, the receiving UE can transmit the PSFCH via beam #i if the L1 priority of traffic i is lower than the L1 priority of traffic j. For another example, the receiving UE can transmit the PSFCH via beam #j if the L1 priority of traffic i is higher than the L1 priority of traffic j. Here, the lower the priority value, the higher the priority, and the higher the priority value, the lower the priority.

[0076] Additionally, when a PSFCH transmission collision occurs, the receiving UE (Rx UE) can determine the PSFCH transmission beam based on HARQ priority information of data channels received directly through communication beams from multiple transmitting UEs (Tx UEs).

[0077] HARQ priorities can be defined based on the traffic characteristics of a channel (e.g., PSSCH). For example, PSCCH HARQ priorities can be determined based on whether the Quality of Service (QoS) of the PSSCH prioritizes reliability and / or is sensitive to latency. Reliability and / or latency may vary depending on PSSCH traffic characteristics. For traffic where reliability is more important than latency, the PSSCH HARQ priority may be lower, and for traffic where latency is more important than reliability, the PSSCH HARQ priority may be higher. In addition to the L1 priority information of the PSSCH corresponding to the 1st-stage SCI transmitted on the PSCCH, HARQ priority information may be included.

[0078] For example, the receiving UE can transmit the PSFCH through beam #i if the HARQ priority of traffic i is lower than the HARQ priority of traffic j. For another example, the receiving UE can transmit the PSFCH through beam #j if the HARQ priority of traffic i is higher than the HARQ priority of traffic j. Here, the smaller the priority value, the higher the priority, and the larger the priority value, the lower the priority.

[0079] According to some implementations of this specification, a receiving UE (Rx UE), which receives a data channel from multiple transmitting UEs (Tx UEs) via different beams, may determine / select feedback information to be transmitted by considering traffic characteristics of each data channel when resource regions for transmitting feedback information overlap when transmitting feedback information for the data channel. Through this, the UE(s) can efficiently perform direct communication with other UE(s) by determining a feedback channel transmission beam, and can efficiently prevent communication delay due to beam collision.

[0080] The beam determination method(s) described in this specification are examples for avoiding beam collisions according to some implementations of this specification, and are not limited thereto, and UE(s) may perform direct communication using a combination of each method(s). For example, a receiving UE (Rx UE) may determine a PSFCH transmission beam based on a combination of L1 priority information and HARQ priority information of data channels (e.g., PSSCHs) received from multiple transmitting UEs (Tx UEs) when a PSFCH transmission collision occurs.

[0081] FIG. 6 is a block diagram illustrating examples of communication devices capable of performing a method according to the present specification.

[0082] Referring to FIG. 6, the first wireless device (100) and the second wireless device (200) can transmit and / or receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the first UE, the second UE}, {the first UE, the third UE}, {the second UE, the third UE}, and / or {the Tx UE, the Rx UE}.

[0083] 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(s) (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the functions, procedures, and / or methods described / proposed above. For example, the processor(s) (102) may process information in the memories (104) to generate first information / signals, and then transmit a wireless signal including the first information / signals via the transceivers (106). In addition, the processor(s) (102) may receive a wireless signal including second information / signal through the transceiver(s) (106), and then store information obtained from signal processing of the second information / signal in the memory(s) (104). The memory(s) (104) may be connected to the processor(s) (102) and may store various information related to the operation of the processor(s) (102). For example, the memory(s) (104) may perform some or all of the processes controlled by the processor(s) (102), or store software code including instructions for performing the procedures and / or methods described / proposed above. Here, the processor(s) (102) and the memory(s) (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver(s) (106) may be connected to the processor(s) (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver(s) (106) may include a transmitter and / or a receiver. The transceiver(s) (106) may be used interchangeably with an RF (Radio Frequency) unit. In this specification, a wireless device may also mean a communication modem / circuit / chip.

[0084] 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(s) (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the functions, procedures, and / or methods described / proposed above. For example, the processor(s) (202) may process information in the memories (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). In addition, the processor(s) (202) may receive a wireless signal including the fourth information / signal through the transceiver(s) (206), and then store information obtained from signal processing of the fourth information / signal in the memory(s) (204). The memory(s) (204) may be connected to the processor(s) (202) and may store various information related to the operation of the processor(s) (202). For example, the memory(s) (204) may perform some or all of the processes controlled by the processor(s) (202), or store software code including instructions for performing the procedures and / or methods described / proposed above. Here, the processor(s) (202) and the memory(s) (204) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver(s) (206) may be connected to the processor(s) (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver(s) (206) may include a transmitter and / or a receiver. The transceiver(s) (206) may be used interchangeably with an RF unit. In this specification, a wireless device may also mean a communication modem / circuit / chip.

[0085] Hereinafter, the hardware elements of the 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 a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). 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 functions, procedures, proposals, and / or methods disclosed in this specification. One or more processors (102, 202) may generate messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in this specification. One or more processors (102, 202) may 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 in this specification, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) may 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 functions, procedures, proposals and / or methods disclosed in this specification.

[0086] 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 functions, procedures, proposals, and / or methods disclosed in this specification may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the functions, procedures, suggestions and / or methods disclosed in this specification may be included in 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 functions, procedures, suggestions and / or methods disclosed in this specification may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0087] 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.

[0088] One or more transceivers (106, 206) may transmit user data, control information, wireless signals / channels, etc., as described in the methods and / or flowcharts according to some implementations of this specification to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, wireless signals / channels, etc., as described in the functions, procedures, proposals, methods and / or flowcharts disclosed in this specification from one or more other devices. For example, one or more transceivers (106, 206) may be coupled to one or more processors (102, 202) and may transmit and / or receive wireless signals. For example, one or more processors (102, 202) may 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 / or receive user data, control information, wireless signals / channels, or the like, as referred to in the functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this specification, via one or more antennas (108, 208). In this specification, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) may convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals for processing 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.

[0089] In this specification, a computer-readable storage medium can store at least one instruction or computer program, which when executed by at least one processor can cause the at least one processor to perform operations according to some embodiments or implementations of this specification.

[0090] In this specification, a computer program or computer program product may be recorded on at least one computer-readable (non-volatile) storage medium and may contain instructions that, when executed, cause (at least one processor) to perform operations according to some embodiments or implementations of this specification.

[0091] In this specification, a processing device or apparatus may include at least one processor and at least one computer memory connectable to the at least one processor. The at least one computer memory may store instructions or programs, which, when executed, cause at least one processor operably connected to the at least one memory to perform operations according to some embodiments or implementations of the present specification.

[0092] As described above, the examples disclosed in this specification are provided to enable those skilled in the relevant technical fields to implement and practice this specification. While the examples of this specification have been described above with reference to the examples, those skilled in the relevant technical fields can modify and adapt the examples of this specification in various ways. For example, those skilled in the art can utilize the individual components described in the examples of this specification in combination with each other.

[0093] Accordingly, this specification is not intended to be limited to the examples described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0094] The embodiments described above have been described with a focus on cases where they are applied and utilized in 3GPP, but are not limited thereto and can be utilized in various mobile communication systems.

Claims

1. In a method for a first user equipment (UE) to perform direct communication with a second UE and a third UE in a mobile communication system, Receive a first direct communication beam from the second UE, Receive a second direct communication beam from the third UE, Determine a physical layer feedback channel resource region for transmitting at least one of first feedback information for the first direct communication beam or second feedback information for the second direct communication beam; Including transmitting at least one of the first feedback information or the second feedback information through the determined physical layer feedback channel resource area, Determining the above physical layer feedback channel resource area is: Determine whether the first resource area to transmit the first feedback information and the second resource area to transmit the second feedback information overlap, A method for performing direct communication, comprising selecting feedback information to be transmitted based on the priority of the first feedback information and the second feedback information, based on the overlapping of the first resource area and the second resource area.

2. In paragraph 1, Receiving the first direct communication beam, Receiving first L1 priority information of a first data channel received through the first direct communication beam, Receiving the second direct communication beam, A method for performing direct communication, comprising receiving second L1 priority information of a second data channel received through the second direct communication beam.

3. In paragraph 2, Selecting the feedback information to be transmitted above is as follows: A method for performing direct communication, wherein selection is made based on the first L1 priority information and the second L1 priority information.

4. In paragraph 1, Receiving the first direct communication beam, Including receiving first HARQ priority information of a first data channel received through the first direct communication beam, Receiving the second direct communication beam, A method for performing direct communication, comprising receiving second HARQ priority information of a second data channel received through the second direct communication beam.

5. In paragraph 4, A method for performing direct communication, wherein the first HARQ priority information and the second HARQ priority information are determined by considering at least one of whether the QoS (Quality of Service) of the first data channel and the second data channel prioritizes reliability or is sensitive to delay.

6. In paragraph 4, Selecting the feedback information to be transmitted above is as follows: A method for performing direct communication, wherein selection is made based on the first HARQ priority information and the second HARQ priority information.

7. In paragraph 6, Receiving the first direct communication beam and the second direct communication beam, Including receiving first L1 priority information and second L1 priority information received through the first direct communication beam and the second direct communication beam, respectively; Selecting the feedback information to be transmitted above is as follows: Additionally, a method for performing direct communication, wherein selection is made based on the first L1 priority information and the second L1 priority information.

8. In a mobile communication system, a first UE that performs direct communication with a second user equipment (UE) and a third UE, At least one processor; at least one transmitter and receiver; and At least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations; The above actions are, Receive a first direct communication beam from the second UE, Receive a second direct communication beam from the third UE, Determine a physical layer feedback channel resource region for transmitting at least one of first feedback information for the first direct communication beam or second feedback information for the second direct communication beam; Including transmitting at least one of the first feedback information or the second feedback information through the determined physical layer feedback channel resource area, Determining the above physical layer feedback channel resource area is: Determine whether the first resource area to transmit the first feedback information and the second resource area to transmit the second feedback information overlap, A user device comprising: selecting feedback information to be transmitted based on the priority of the first feedback information and the second feedback information, based on the overlapping of the first resource area and the second resource area.

9. In paragraph 8, Receiving the first direct communication beam, Receiving first L1 priority information of a first data channel received through the first direct communication beam, Receiving the second direct communication beam, A user device comprising receiving second L1 priority information of a second data channel received via the second direct communication beam.

10. In paragraph 9, Selecting the feedback information to be transmitted above is as follows: A user device that selects based on the first L1 priority information and the second L1 priority information.

11. In paragraph 8, Receiving the first direct communication beam, Including receiving first HARQ priority information of a first data channel received through the first direct communication beam, Receiving the second direct communication beam, A user device comprising receiving second HARQ priority information of a second data channel received through the second direct communication beam.

12. In paragraph 11, A user device, wherein the first HARQ priority information and the second HARQ priority information are determined by considering at least one of whether the QoS (Quality of Service) of the first data channel and the second data channel prioritizes reliability or is sensitive to delay.

13. In paragraph 11, Selecting the feedback information to be transmitted above is as follows: A user device that selects based on the first HARQ priority information and the second HARQ priority information.

14. In paragraph 13, Receiving the first direct communication beam and the second direct communication beam, Including receiving first L1 priority information and second L1 priority information received through the first direct communication beam and the second direct communication beam, respectively; Selecting the feedback information to be transmitted above is as follows: Additionally, a user device that selects based on the first L1 priority information and the second L1 priority information.

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