Method for performing beam management for direct communication and user equipment for same

Abstract

Provided are a method for performing beam management for direct communication and a device for same. To this end, this method in which a first user equipment (UE) performs beam management for direct communication with a second UE comprises: receiving a direct communication data channel from the second UE; transmitting first feedback information for the direct communication data channel to the second UE through a physical layer feedback channel; receiving a reference signal (RS) for the beam management from the second UE; and transmitting second feedback information for the RS to the second UE through the physical layer feedback channel, wherein a second resource on the physical layer feedback channel for transmitting the second feedback information is determined on the basis of a first resource on the physical layer feedback channel for transmitting the first feedback information.

Description

Method for performing beam management for direct communication and user device therefor

[0001] This specification relates to direct communication between user devices. Specifically, it relates to a method for performing beam management for direct communication 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 transmission data from another user equipment (UE) can transmit feedback thereon through a physical layer feedback channel (e.g., PSFCH (Physical Sidelink Feedback Channel).

[0012] Additionally, a UE that has received a reference signal for beam management from another UE can transmit feedback thereon through a physical layer feedback channel (e.g., PSFCH).

[0013] However, since the transmission resources of the physical layer feedback channel are finite, when transmitting feedback on the data channel received by the UE and feedback on the received reference signal within the transmission resources of the limited physical layer feedback channel, it is necessary to specify the relationship between the transmission resources of the feedback channel for the data channel and the transmission resources of the feedback on the reference signal for beam management.

[0014] 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.

[0015] In one aspect of the present specification, a method for performing beam management for direct communication between a first user equipment (UE) and a second UE in a mobile communication system is provided. The method includes receiving a direct communication data channel from the second UE, transmitting first feedback information for the direct communication data channel to the second UE through a physical layer feedback channel, receiving a reference signal (RS) for the beam management from the second UE, and transmitting second feedback information for the RS to the second UE through the physical layer feedback channel, wherein a second resource on the physical layer feedback channel for transmitting the second feedback information is determined based on a first resource on the physical layer feedback channel for transmitting the first feedback information.

[0016] In another aspect of the present disclosure, a first user equipment (UE) for performing beam management for direct communication with a second user equipment (UE) in a mobile communication system is provided. 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 direct communication data channel from the second UE, transmitting first feedback information for the direct communication data channel to the second UE via a physical layer feedback channel, receiving a reference signal (RS) for the beam management from the second UE, and transmitting second feedback information for the RS to the second UE via the physical layer feedback channel, wherein a second resource on the physical layer feedback channel for transmitting the second feedback information is determined based on a first resource on the physical layer feedback channel for transmitting the first feedback information.

[0017] In another aspect of the present specification, a method for performing beam management for direct communication between a second user equipment (UE) and a first UE in a mobile communication system is provided. The method includes transmitting a direct communication data channel to the first UE, receiving first feedback information for the direct communication data channel from the first UE through a physical layer feedback channel, transmitting a reference signal (RS) for the beam management to the first UE, and receiving second feedback information for the RS from the first UE through the physical layer feedback channel, wherein a second resource on the physical layer feedback channel through which the second feedback information is received is determined based on a first resource on the physical layer feedback channel through which the first feedback information is received.

[0018] In another aspect of the present disclosure, a second UE is provided for performing beam management for direct communication with a first user equipment (UE) in a mobile communication system. The second UE includes 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: transmitting a direct communication data channel to the first UE, receiving first feedback information for the direct communication data channel from the first UE via a physical layer feedback channel, transmitting a reference signal (RS) for the beam management to the first UE, and receiving second feedback information for the RS from the first UE via the physical layer feedback channel, wherein a second resource on the physical layer feedback channel on which the second feedback information is received is determined based on a first resource on the physical layer feedback channel on which the first feedback information is received.

[0019] In each aspect of this specification, the first resource may be determined based on an identifier (ID) of the first UE and an ID of the second UE.

[0020] In each aspect of this specification, the second resource may be determined as a first time resource identical to the first resource.

[0021] Additionally, the physical layer feedback channel transmits two-bit information in the first frequency resource within the first time resource, and the first feedback information and the second feedback information may each represent one-bit information transmitted through different codes among the two-bit information.

[0022] Additionally, the first resource corresponds to a first frequency resource of the first time resource, the second resource corresponds to one or more frequency resources including a second frequency resource of the first time resource, and the one or more frequency resources including the second frequency resource may be subsequent to the first frequency resource.

[0023] Additionally, the one or more frequency resources including the second frequency resource are determined to be located within K frequency units from the first frequency resource, wherein K may be a preset value or an arbitrary value based on the location of the first frequency resource.

[0024] In each aspect of this specification, the first resource is determined as a first time resource, and the second resource is determined as a different time resource from the first resource, but may be determined as a second time resource that precedes the first time resource.

[0025] Additionally, the second time resource is determined to be located within K time units from the reception time of the RS for beam management, and K may correspond to the minimum time interval required from the reception time of the direct communication data channel to the transmission of the first feedback information.

[0026] 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.

[0027] According to some implementations of this specification, it is possible to specify a relationship between transmission resources of a feedback channel for a direct communication data channel and transmission resources of a feedback channel for a reference signal for beam management.

[0028] According to some implementations of this specification, beam management can be efficiently performed by utilizing transmission resources of a feedback channel for a direct communication data channel.

[0029] 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.

[0030] 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.

[0031] Figure 1 illustrates the structure of a system for 5th generation (5G) communication.

[0032] FIG. 2 illustrates a procedure for performing sidelink communication according to some implementations of this specification.

[0033] FIG. 3 relates to a method for transmitting feedback for a direct communication data channel through a physical layer feedback channel in a mobile communication system.

[0034] FIG. 4 illustrates a flowchart of a method for performing beam management for direct communication according to some implementations of this specification.

[0035] FIG. 5 illustrates an example of a method for transmitting feedback for a reference signal for beam management in the same time resources as the transmission resources of a physical layer feedback channel for a direct communication data channel, according to some implementations of the present specification.

[0036] FIG. 6 illustrates another example of a method for transmitting feedback for a reference signal for beam management in the same time resources as the transmission resources of a physical layer feedback channel for a direct communication data channel, according to some implementations of the present specification.

[0037] FIG. 7 illustrates an example of a method for transmitting feedback for a reference signal for beam management in a different time resource associated with the transmission resources of a physical layer feedback channel for a direct communication data channel, according to some implementations of the present specification.

[0038] Figure 8 illustrates examples of communication devices capable of performing a method according to the present specification.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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".

[0045] 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.

[0046] 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.

[0047] For terms and technologies used in this specification that are not specifically explained, reference can be made to 3GPP-based standard documents.

[0048] 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."

[0049] 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 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.

[0050] 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.

[0051] 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.

[0052] FIG. 2 illustrates a procedure for performing sidelink communication according to some implementations of this specification.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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 a 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 a CG resource to the first UE, and the BS can transmit a DCI related to activation or release of a CG resource to the first UE.

[0058] 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.

[0059] The table below shows an example of DCI for scheduling SL.

[0060] 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.

[0061] Additionally, PUCCH supports multiple formats, and PUCCH formats can be classified as shown in the table below.

[0062] Format TypeLength of symbolsNumber of bits01-2<=214-14<=221-2>234-14>244-14>2

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 using a relationship between a PSFCH resource transmitting feedback information for beam management and a PSFCH resource transmitting HARQ feedback information for the PSSCH, when the UE receives a reference signal for beam management and transmits feedback information for the received reference signal via the PSFCH.

[0067] FIG. 3 relates to a method for transmitting feedback for a direct communication data channel through a physical layer feedback channel in a mobile communication system.

[0068] According to some implementations of this specification, based on the sidelink communication method described above, a receiving UE (Rx UE) that has received transmission data from a transmitting UE (Tx UE) can transmit feedback thereon via a PSFCH. In other words, according to some implementations of this specification, the receiving UE can transmit HARQ feedback information for a PSSCH via a PSFCH.

[0069] Specifically, referring to FIG. 3, HARQ feedback information for the PSSCH is transmitted via the PSFCH. The PSFCH is configured in PUCCH format 0, can be transmitted in units of 1 physical resource block (PRB), and can be transmitted with a maximum of 2 bits.

[0070] Additionally, resources on the PSFCH for transmitting HARQ feedback information for the PSSCH are determined based on the identifier (ID) of the transmitting UE and / or the ID of the receiving UE. T ID Let R be the ID of the transmitting UE, and ID Let be the ID of the receiving UE, and when F PSFCHs can operate with HARQ, the receiving UE has i = mod(TID + R ID , F), HARQ feedback information can be transmitted as the i-th PSFCH resource.

[0071] Hereinafter, a method for defining a relationship between a resource of a PSFCH transmitting HARQ feedback information for a PSSCH as described above and a PSFCH resource transmitting feedback information for beam management according to some implementations of the present specification is specifically described.

[0072] FIG. 4 illustrates a flowchart of a method for performing beam management for direct communication according to some implementations of this specification.

[0073] Referring to FIG. 4, a first UE can receive a direct communication data channel from a second UE (S410), and in response thereto, the first UE can transmit first feedback information for the direct communication data channel to the second UE through a physical layer feedback channel (S420). The first UE can receive a reference signal (RS) for beam management from the second UE (S430). In response thereto, the first UE transmits second feedback information for the RS received to the second UE through the physical layer feedback channel, wherein a second resource on the physical layer feedback channel for transmitting the second feedback information can be determined based on a first resource on the physical layer feedback channel for transmitting the first feedback information (S440).

[0074] Here, the second resource can be determined as a first time resource identical to the first resource.

[0075] Alternatively, the second resource may be determined as a different time resource from the first resource.

[0076] The physical layer feedback channel may be a channel corresponding to the PSFCH among the channels related to FIG. 2. In this specification, we propose to define the relationship between resources on a physical layer feedback channel that transmit feedback information for an RS for beam management and resources on a physical layer feedback channel that transmit feedback information for a direct communication data channel. Specifically, we propose to define the relationship between resources on a PSFCH that transmit feedback information for a CSI-RS and resources on a PSFCH that transmit feedback information for a PSSCH. Based on this relationship, a specific method for a UE that transmits and receives a PSSCH and / or a CSI-RS in a mobile communication system to perform beam management is described below.

[0077] According to some implementations of this specification, the UE may transmit feedback information for the CSI-RS over the same PSFCH that transmits feedback information for the PSSCH. In other words, the CSI-RS feedback information may be transmitted on the same time resource as the resource of the PSFCH for transmitting the PSSCH HARQ feedback information.

[0078] FIG. 5 illustrates an example of a method for transmitting feedback for a reference signal for beam management in the same time resources as the transmission resources of a physical layer feedback channel for a direct communication data channel, according to some implementations of the present specification.

[0079] Referring to FIG. 5, the UE may transmit CSI-RS feedback information on the same time resource as the PSFCH resource for transmitting PSSCH HARQ feedback information. For example, the i-th PSFCH resource selected for transmitting feedback information for the PSSCH may be used to transmit feedback information for the CSI-RS.

[0080] In addition, since PSFCH is configured as PUCCH format 0 and can transmit information with up to 2 bits, 1 bit can be used to transmit PSSCH HARQ feedback information and 1 bit can be used to transmit CSI-RS feedback information. In other words, in the frequency resource within the PSFCH resource for transmitting PSSCH HARQ feedback information, 1 bit can include PSSCH HARQ feedback information and 1 bit can include CSI-RS feedback information. Here, 1 bit including PSSCH HARQ feedback information and 1 bit including CSI-RS feedback information can be transmitted through different codes. CSI-RS feedback information is information that estimates beam information through CSI-RS, and can indicate, for example, whether RSRP (Reference Signal Received Power) of a CSI-RS beam exceeds a threshold. For example, the UE may transmit feedback(s) in a frequency resource within the i-th PSFCH resource selected to transmit PSSCH HARQ feedback information, including 1 bit including PSSCH HARQ feedback information and 1 bit including indicator information indicating whether RSRP of a CSI-RS beam exceeds a threshold.

[0081] FIG. 6 illustrates another example of a method for transmitting feedback for a reference signal for beam management in the same time resources as the transmission resources of a physical layer feedback channel for a direct communication data channel, according to some implementations of the present specification.

[0082] Referring to FIG. 6, the UE can transmit CSI-RS feedback information on the same time resource as the PSFCH resource for transmitting PSSCH HARQ feedback information. Here, an additional PSFCH resource for transmitting CSI-RS feedback information (or beam information) can be selected based on the PSFCH resource selected for transmitting PSSCH HARQ feedback information.

[0083] For example, if the ith PSFCH resource is selected to transmit feedback information for the PSSCH, CSI-RS feedback information (or beam information) may be transmitted on the (i+k)th PSFCH resource. For example, if the ith PSFCH resource is selected to transmit PSSCH HARQ feedback and k is 1, beam information may be transmitted on the (i+1)th PSFCH resource. Alternatively, k may be a preset, fixed value. Alternatively, k may be mod(F, i). However, this is merely an example, and the value of k may be determined according to various embodiments of the present specification.

[0084] In addition, when the i-th PSFCH resource is selected to transmit feedback information for the PSSCH, CSI-RS feedback information (or beam information) may be transmitted using multiple PSFCH resources, such as the i+k-th PSFCH resource, the i+2k-th PSFCH resource, and the i+3k-th PSFCH resource.

[0085] According to some implementations of this specification, the UE may transmit feedback information for the CSI-RS on a different PSFCH than the PSFCH that transmits feedback information for the PSSCH. In other words, the CSI-RS feedback information may be transmitted on a different time resource than the resource of the PSFCH for transmitting the PSSCH HARQ feedback information. However, the PSFCH resource for transmitting the CSI-RS feedback information may be determined based on the resource of the PSFCH for transmitting the PSSCH HARQ feedback information.

[0086] FIG. 7 illustrates an example of a method for transmitting feedback for a reference signal for beam management in a different time resource associated with the transmission resources of a physical layer feedback channel for a direct communication data channel, according to some implementations of the present specification.

[0087] Referring to FIG. 7, the UE can transmit CSI-RS feedback information (701) on a different time resource from the resource of the PSFCH for transmitting PSSCH HARQ feedback information (702). The PSFCH resource for transmitting CSI-RS feedback information (or beam information) (701) can be selected based on the PSFCH resource selected for transmitting PSSCH HARQ feedback information (702).

[0088] Since CSI-RS feedback information is fed back by measuring RSRP through CSI-RS, a K value smaller than the K value of PSSCH HARQ feedback may be required. Here, the K value is the minimum time interval required from the time of PSSCH reception to the transmission of PSSCH HARQ feedback information, and may mean the minimum number of slots between the PSSCH and PSFCH.

[0089] Therefore, this specification proposes a method for determining the resources of the PSFCH for CSI-RS feedback transmission based on the resources of the PSFCH for PSSCH HARQ feedback transmission, but with a time resource that precedes the time resource of the PSFCH for PSSCH HARQ feedback transmission. This will be described in detail below.

[0090] Referring to FIG. 7, CSI-RS feedback (701) can be transmitted at the p-1th PSFCH occasion preceding PSSCH HARQ feedback (702).

[0091] When CSI-RS feedback (701) is transmitted at the p-1th PSFCH period, the relationship with the PFSCH resource for transmitting feedback information for the previously transmitted PSSCH can be defined as follows.

[0092] CSI-RS feedback (or beam information) (701) is transmitted on the i-th PSFCH resource in the p-1-th PSFCH period, and 1 bit of the frequency resource within the corresponding PSFCH resource can be used for transmission of previous PSSCH HARQ feedback information, and 1 bit can be used for transmission of the corresponding CSI-RS feedback (701). Here, the i-th PSFCH resource can mean a resource selected for transmitting feedback information for a previously transmitted PSSCH in the p-1-th PSFCH period.

[0093] Alternatively, the CSI-RS feedback (or beam information) (701) may be transmitted at the p-1th PSFCH time period, and an additional PSFCH resource for the CSI-RS feedback (701) may be selected. For example, if the i-th PSFCH resource is selected to transmit feedback information for a previously transmitted PSSCH at the p-1th PSFCH time period, the CSI-RS feedback (701) may be transmitted at the i+k-th PSFCH resource. In addition, if the i-th PSFCH resource is selected to transmit feedback information for a previously transmitted PSSCH at the p-1th PSFCH time period, the CSI-RS feedback information (or beam information) may be transmitted using multiple PSFCH resources, such as the i+k-th PSFCH resource, the i+2k-th PSFCH resource, and the i+3k-th PSFCH resource. Here, k may be a preset arbitrary fixed value. Alternatively, k may be mod(F, i). However, this is only an example and the value of k may be determined according to various embodiments of this specification.

[0094] According to some implementations of this specification, beam management can be efficiently performed using the transmission resources of the feedback channel for the direct communication data channel by specifying the relationship between the transmission resources of the feedback channel for the direct communication data channel and the transmission resources of the feedback channel for the reference signal for beam management.

[0095] Figure 8 illustrates examples of communication devices capable of performing a method according to the present specification.

[0096] Referring to FIG. 8, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, the first wireless device (100) and the second wireless device (200) can correspond to the first UE and the second UE, respectively.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 performing beam management for direct communication between a first user equipment (UE) and a second UE in a mobile communication system, Receive a direct communication data channel from the second UE, Transmitting first feedback information for the direct communication data channel to the second UE through a physical layer feedback channel, Receive a reference signal (RS) for beam management from the second UE, Including transmitting second feedback information for the RS to the second UE through the physical layer feedback channel, A beam management performing method, wherein a second resource on the physical layer feedback channel for transmitting the second feedback information is determined based on a first resource on the physical layer feedback channel for transmitting the first feedback information.

2. In paragraph 1, A beam management performing method, wherein the first resource is determined based on an identifier (ID) of the first UE and an ID of the second UE.

3. In paragraph 2, A beam management performing method, wherein the second resource is determined as a first time resource identical to the first resource.

4. In paragraph 3, The above physical layer feedback channel transmits 2 bits of information in the first frequency resource within the first time resource, A beam management performing method, wherein the first feedback information and the second feedback information each represent 1-bit information transmitted through different codes among the 2-bit information.

5. In paragraph 3, The above first resource corresponds to the first frequency resource of the above first time resource, The second resource corresponds to one or more frequency resources including a second frequency resource of the first time resource, A method for performing beam management, wherein the one or more frequency resources including the second frequency resource are subsequent to the first frequency resource.

6. In paragraph 5, The one or more frequency resources including the second frequency resource are determined to be located within K frequency units from the first frequency resource, A method for performing beam management, wherein the above K is a preset value or an arbitrary value based on the location of the first frequency resource.

7. In paragraph 2, The above first resource is determined as the first time resource, A beam management performing method, wherein the second resource is determined as a different time resource from the first resource, but is determined as a second time resource that precedes the first time resource.

8. In paragraph 7, The second time resource is determined to be located within K time units from the reception time of the RS for beam management, A beam management performing method, wherein the above K corresponds to the minimum time interval required from the time of receiving the direct communication data channel to the transmission of the first feedback information.

9. In a method for performing beam management for direct communication between a second user equipment (UE) and a first UE in a mobile communication system, Transmitting a direct communication data channel to the above first UE, Receive first feedback information for the direct communication data channel from the first UE through a physical layer feedback channel, Transmitting a reference signal (RS) for beam management to the first UE, Including receiving second feedback information for the RS from the first UE through the physical layer feedback channel, A beam management performing method, wherein a second resource on the physical layer feedback channel through which the second feedback information is received is determined based on a first resource on the physical layer feedback channel through which the first feedback information is received.

10. In paragraph 9, A beam management performing method, wherein the first resource is determined based on an identifier (ID) of the first UE and an ID of the second UE.

11. In paragraph 10, A beam management performing method, wherein the second resource is determined as a first time resource identical to the first resource.

12. In paragraph 11, The above physical layer feedback channel transmits 2 bits of information in the first frequency resource within the first time resource, A beam management performing method, wherein the first feedback information and the second feedback information each represent 1-bit information transmitted through different codes among the 2-bit information.

13. In paragraph 11, The above first resource corresponds to the first frequency resource of the above first time resource, The second resource corresponds to one or more frequency resources including a second frequency resource of the first time resource, A method for performing beam management, wherein the one or more frequency resources including the second frequency resource are subsequent to the first frequency resource.

14. In paragraph 13, The one or more frequency resources including the second frequency resource are determined to be located within K frequency units from the first frequency resource, A method for performing beam management, wherein the above K is a preset value or an arbitrary value based on the location of the first frequency resource.

15. In paragraph 10, The above first resource is determined as the first time resource, A beam management performing method, wherein the second resource is determined as a different time resource from the first resource, but is determined as a second time resource that precedes the first time resource.

16. In paragraph 15, The second time resource is determined to be located within K time units from the transmission time of the RS for beam management, A beam management performing method, wherein the above K corresponds to the minimum time interval required from the transmission time of the direct communication data channel to the reception of the first feedback information.

17. In a mobile communication system, a first UE performs beam management for direct communication with a second user equipment (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 direct communication data channel from the second UE, Transmitting first feedback information for the direct communication data channel to the second UE through a physical layer feedback channel, Receive a reference signal (RS) for beam management from the second UE, Including transmitting second feedback information for the RS to the second UE through the physical layer feedback channel, A user device, wherein a second resource on the physical layer feedback channel for transmitting the second feedback information is determined based on a first resource on the physical layer feedback channel for transmitting the first feedback information.

18. In a mobile communication system, a second UE performs beam management for direct communication with a first user equipment (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, Transmitting a direct communication data channel to the above first UE, Receive first feedback information for the direct communication data channel from the first UE through a physical layer feedback channel, Transmitting a reference signal (RS) for beam management to the first UE, Including receiving second feedback information for the RS from the first UE through the physical layer feedback channel, A user device, wherein a second resource on the physical layer feedback channel through which the second feedback information is received is determined based on a first resource on the physical layer feedback channel through which the first feedback information is received.

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