Method and device for transmitting and receiving data in mobile communication system in MTRP environment

Abstract

A terminal according to an embodiment disclosed herein may comprise the steps of: receiving a report request message including TRP selection reference information from a first TRP communicating with the terminal through a first resource; checking whether to-be-queried first information including a second TRP indicated in the received TRP selection reference information is included; and when the to-be-queried first information of the second TEP is included, sending a first request message requesting the received TRP to select the first information in the reference information to the second TRP.

Description

Technical Field

[0001] The present invention relates to communication technology, and more specifically, to technology for selecting a transmission and reception point (TRP) and allocating resources thereto in a multi-TRP (mTRP) environment. Background Art

[0002] Communication networks (e.g., 5G communication networks or 6G communication networks) are being developed to provide enhanced communication services compared to existing communication networks (e.g., long term evolution (LTE), LTE-Advanced, etc.). 5G communication networks (e.g., New Radio (NR) communication networks) can support frequency bands below 6 GHz and frequency bands above 6 GHz. In other words, 5G communication networks can support frequency region 1 (FR1) bands and / or FR2 bands. Compared with LTE communication networks, 5G communication networks can support various communication services and scenarios. For example, usage scenarios of 5G communication networks may include enhanced Mobile BroadBand (eMBB), UltraReliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared with 5G communication networks, 6G communication networks can support a wide variety of communication services and scenarios. 6G communication networks can meet the requirements of ultra-performance, ultra-bandwidth, ultra-space, ultra-precision, ultra-intelligence and / or ultra-reliability. 6G communication networks can support multiple broadband bands and can be applied to various usage scenarios, such as terrestrial communication, non-terrestrial communication, sidelink communication, etc.

[0004] On the other hand, in 5G NR, multiple transmission and reception point (MTRP) technology refers to the technology that gNB uses physically separated multiple TRPs to communicate with terminals. MTRP technology helps to solve the problem of reduced quality of service (QoS) of cell-edge terminals far away from the base station, and alleviates inter-cell interference from base stations in different cells. In addition, it helps to provide alternative communication paths in environments with limited non-line-of-sight (NLOS) paths (for example, in the millimeter wave band).

[0005] In the current standard, MTRP technology is classified into a coherent joint transmission (CJT) scheme and a non-coherent joint transmission (NCJT) scheme. In the CJT scheme, TRPs collaborate in a synchronous manner based on a reliable backhaul link between base stations connected to the TRPs. On the other hand, in the NCJT scheme, scheduling, pre-coding matrix selection, modulation, and coding schemes are determined uncoordinatedly between multiple TRPs supporting a single terminal.

[0006] Therefore, in the MTRP environment, when using the NCJT solution, it is necessary to consider adopting a new resource allocation solution for TRP synchronization. Summary of the invention

[0007] Technical issues

[0008] The present invention is directed to providing a method and apparatus for allocating resources in a mobile communication system having a multi-TRP (mTRP) environment.

[0009] Technical Solution

[0010] According to an exemplary embodiment of the present invention, a method of a terminal may include: receiving a report request message including TRP selection reference information from a first sending and receiving point (TRP) that communicates with the terminal through a first resource; determining whether the received TRP selection reference information includes first information to be requested from a second TRP indicated by the received TRP selection reference information; in response to determining that the first information to be requested from the second TRP is included in the received TRP selection reference information, sending a first request message requesting the first information to the second TRP; and when receiving a first response message including the first information from the second TRP, sending a second response message including the first information to the first TRP.

[0011] The method may also include: before receiving the report request message, obtaining information about the first TRP from the first TRP and obtaining information about the second TRP from the second TRP; sending information about the first TRP to the second TRP; and sending information about the second TRP to the first TRP, wherein the information about the first TRP and the information about the second TRP each include a TRP identifier (ID) and allocated frequency band information.

[0012] The first information may be information about utilization of specific resources of the second TRP.

[0013] The method may further include: in response to the TRP selection reference information including a request for a reference signal received power (RSRP) of a synchronization signal block (SSB) sent by the second TRP, measuring the RSRP of the SSB of the second TRP, wherein the first response message may further include the RSRP of the SSB of the second TRP.

[0014] The method may further include: receiving user data sending indication information including a TRP ID from the first TRP; receiving allocation information of a second resource different from the first resource from the first TRP in response to the TRP ID indicating the first TRP; and receiving user data based on the allocation information of the second resource.

[0015] The method may further include: receiving user data sending indication information including the ID of the second TRP and information related to the communication link of the first resource from the first TRP; sending the ID of the second TRP and information related to the communication link of the first resource to the second TRP; receiving allocation information of the second resource from the second TRP based on the information related to the communication link of the first resource; and receiving user data based on the allocation information of the second resource.

[0016] The allocation information of the second resource may indicate resources included in the same bandwidth part (BWP) as the first resource.

[0017] The information related to the communication link of the first resource may include: information related to the physical resource block (PRB) between the first TRP and the terminal.

[0018] According to an exemplary embodiment of the present invention, a terminal may include at least one processor, wherein the at least one processor causes the terminal to execute: receiving a report request message including TRP selection reference information from a first sending and receiving point (TRP) that communicates with the terminal through a first resource; determining whether the received TRP selection reference information includes first information to be requested from a second TRP indicated by the received TRP selection reference information; in response to determining that the first information to be requested from the second TRP is included in the received TRP selection reference information, sending a first request message requesting the first information to the second TRP; and upon receiving a first response message including the first information from the second TRP, sending a second response message including the first information to the first TRP.

[0019] At least one processor may further cause the terminal to perform: before receiving a report request message, obtaining information about the first TRP from the first TRP and obtaining information about the second TRP from the second TRP; sending information about the first TRP to the second TRP; and sending information about the second TRP to the first TRP, wherein the information about the first TRP and the information about the second TRP each include a TRP identifier (ID) and allocated frequency band information.

[0020] The first information may be information about utilization of specific resources of the second TRP.

[0021] At least one processor may further cause the terminal to perform: in response to the TRP selection reference information including a request for a reference signal received power (RSRP) of a synchronization signal block (SSB) sent by the second TRP, measuring the RSRP of the SSB of the second TRP, wherein the first response message further includes the RSRP of the SSB of the second TRP.

[0022] At least one processor may further cause the terminal to execute: receiving user data sending indication information including a TRP ID from a first TRP; receiving allocation information of a second resource different from the first resource from the first TRP in response to the TRP ID indicating the first TRP; and receiving user data based on the allocation information of the second resource.

[0023] At least one processor can further cause the terminal to execute: receiving user data sending indication information including the ID of the second TRP and information related to the communication link of the first resource from the first TRP; sending the ID of the second TRP and information related to the communication link of the first resource to the second TRP; receiving allocation information of the second resource from the second TRP based on the information related to the communication link of the first resource; and receiving user data based on the allocation information of the second resource.

[0024] The allocation information of the second resource may indicate resources included in the same bandwidth part (BWP) as the first resource.

[0025] The information related to the communication link of the first resource may include: information related to the physical resource block (PRB) between the first TRP and the terminal.

[0026] According to an exemplary embodiment of the present invention, a method of a first sending and receiving point (TRP) may include: in response to requesting additional user data to be sent to a first terminal that communicates with a first TRP using a first resource, sending a report request message including TRP selection reference information obtained from a second TRP to the first terminal; receiving a response message from the first terminal, the response message including first information related to the TRP selection reference information obtained from the second TRP; selecting a TRP for sending user data to the first terminal based on the response message; and sending user data sending indication information including an identifier of the selected TRP to the first terminal.

[0027] The method may further include: before sending the report request message, obtaining information about the first TRP from the first TRP and obtaining information about the second TRP from the second TRP; sending the information about the first TRP to the second TRP; and sending information about the second TRP to the first TRP, wherein the information about the first TRP and the information about the second TRP each include a TRP identifier (ID) and allocated frequency band information.

[0028] The method may further include: in response to the selected TRP being the first TRP, allocating a second resource for sending additional user data to the first terminal; and sending the additional user data to the first terminal via the second resource.

[0029] The method may further include: in response to receiving information requesting specific resources of a second TRP related to TRP selection reference information from a second terminal, generating information about utilization of the specific resources; and sending the generated information about utilization of the specific resources to the second terminal.

[0030] Beneficial Effects

[0031] By applying the apparatus and method according to the present invention, the best TRP for sending data can be determined from different TRPs of a single terminal in an MTRP NCJT environment with the participation of the terminal. In addition, by determining the best TRP through the method of the present invention, additional user data can be smoothly and reliably sent to the terminal from the best TRP. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a conceptual diagram illustrating a first exemplary embodiment of a communication system.

[0033] Figure 2 is a block diagram showing a first exemplary embodiment of a communication node constituting a communication system.

[0034] Figure 3 is a block diagram illustrating a first exemplary embodiment of a communication node performing communications.

[0035] Figure 4a is a block diagram illustrating a first exemplary implementation of a transmit path.

[0036] Figure 4b is a block diagram illustrating a first exemplary implementation of a receive path.

[0037] Figure 5 is a conceptual diagram illustrating a first exemplary embodiment of a system frame in a communication system.

[0038] Figure 6 is a conceptual diagram illustrating a first exemplary embodiment of a subframe in a communication system.

[0039] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of a time slot in a communication system.

[0040] Figure 8 is a conceptual diagram illustrating a first exemplary implementation of time-frequency resources in a communication system.

[0041] Fig. 9 is a signal flow chart of operations for terminals to obtain information about TRPs from TRPs respectively in an MTRP NCJT environment according to an exemplary embodiment.

[0042] Fig.10 is a signal flow diagram according to an exemplary embodiment of information transmission for determining TRP selection criteria in an MTRP NCJT environment.

[0043] Fig.11 is a signal flow diagram according to an exemplary embodiment, in which a terminal sends TRP selection reference information obtained from another TRP to a serving TRP in an MTRP NCJT environment.

[0044] Fig.12 is a signal flow diagram according to an exemplary embodiment of the present invention, in which TRP A selects the best TRP based on SSB RSRP and / or frequency resource utilization in an MTRP NCJT environment.

[0045] Fig.13 is a signal flow diagram according to an exemplary embodiment for the case where TRP A is selected for additional user data transmission in an MTRP NCJT environment.

[0046] Fig.14 is a signal flow diagram according to an exemplary embodiment for the case where TRP B is selected for additional user data transmission in an MTRP NCJT environment.

[0047] Fig.15 is a signal flow chart according to an exemplary embodiment for a case where TRP B, which is a non-serving cell, is determined as a TRP for transmitting additional user data in an MTRP NCJT environment.

[0048] Fig.16 is a signal flow chart according to an exemplary embodiment for a case where TRP B, which is a non-serving cell, transmits additional user data in an MTRP NCJT environment.

[0049] Fig.17 is a block diagram showing the overall process for sending additional user data in an MTRP NCJT environment.

[0050] Fig.18 It is the overall signal flow diagram for the transmission of additional user data in the MTRP NCJT environment. DETAILED DESCRIPTION

[0051] Since the present invention can be variously modified and can have multiple forms, specific exemplary embodiments will be shown in the drawings and described in detail in the specific embodiments. However, it should be understood that it is not intended to limit the present invention to specific exemplary embodiments, but on the contrary, the present invention covers all modifications and alternative forms that fall within the spirit and scope of the present invention.

[0052] Relational terms such as first, second, etc. can be used to describe various elements, but these elements should not be limited by the terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present invention, a first component can be named as a second component, and the second component can also be similarly named as the first component. The term "and / or" means any one or combination of multiple related and described matters.

[0053] In the present invention, "at least one of A and B" may mean "at least one of A or B" or "at least one of a combination of one or more of A and B". In addition, "one or more of A and B" may mean "one or more of A or B" or "one or more of a combination of one or more of A and B".

[0054] In the present invention, "(re)transmission" may refer to "transmission", "retransmission" or "transmission and retransmission", "(re)configuration" may refer to "configuration", "reconfiguration" or "configuration and reconfiguration", "(re)connection" may refer to "connection", "reconnection" or "connection and reconnection", and "(re)access" may refer to "access", "reaccess" or "access and reaccess".

[0055] When it is mentioned that a certain component is "coupled" or "connected" to another component, it should be understood that the certain component is directly "coupled" or "connected" to the other component, or another component may be provided therebetween. On the contrary, when it is mentioned that a certain component is "directly coupled" or "directly connected" to another component, it should be understood that no other component is provided therebetween.

[0056] The terms used in the present invention are only used to describe specific exemplary embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "including" or "having" are intended to indicate the presence of features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but it should be understood that these terms do not exclude the presence or addition of one or more features, quantities, steps, operations, components, parts, or combinations thereof.

[0057] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those generally understood by those of ordinary skill in the art to which the present invention belongs. Terms commonly used in dictionaries and already in dictionaries should be interpreted as having meanings that match the contextual meanings in the art. In this specification, unless explicitly defined, terms are not necessarily interpreted as having formal meanings.

[0058] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate a comprehensive understanding of the present invention, the same reference numerals refer to the same elements in the description of the entire accompanying drawings, and repeated descriptions thereof will be omitted. Operations of the exemplary embodiments clearly described in the present invention and combinations of the exemplary embodiments, expansions of the exemplary embodiments, and / or variants of the exemplary implementations may be performed. Some operations may be omitted, and the sequence of operations may be changed.

[0059] Even when a method (e.g., transmission or reception of a signal) performed at a first communication node among communication nodes is described in an exemplary embodiment, a corresponding second communication node may perform a method (e.g., reception or transmission of a signal) corresponding to the method performed at the first communication node. That is, when the operation of a user equipment (UE) is described, a base station corresponding thereto may perform an operation corresponding to the operation of the UE. Conversely, when the operation of a base station is described, a corresponding UE may perform an operation corresponding to the operation of the base station.

[0060] A base station may be referred to by various terms, such as node B, evolved node B, next generation node B (gNodeB), gNB, equipment, device, node, communication node, base transceiver station (BTS), radio remote head (RRH), transmission reception point (TRP), radio unit (RU), roadside unit (RSU), radio transceiver, access point, access node, etc. User equipment (UE) may be referred to by various terms, such as terminal, equipment, device, node, communication node, end node, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, on-board unit (OBU), etc.

[0061] In the present invention, signaling may be one of higher layer signaling, MAC signaling and physical (PHY) signaling, or a combination of two or more. A message for higher layer signaling may be referred to as a "higher layer message" or a "higher layer signaling message". A message for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message". A message for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message". Higher layer signaling may refer to the operation of sending and receiving system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to the operation of sending and receiving a MAC control element (CE). PHY signaling may refer to the operation of sending and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI) or sidelink control information (SCI)).

[0062] In the present invention, "configuration of an operation (e.g., sending an operation)" may refer to configuration information (e.g., information element, parameter) required for the operation and / or signaling of information indicating the execution of the operation. "Configuration of an information element (e.g., parameter)" may refer to signaling of an information element. In the present invention, "signal and / or channel" may refer to a signal, a channel, or both a signal and a channel, and "signal" may be used to mean "signal and / or channel".

[0063] The communication network to which the exemplary embodiment is applied is not limited to the communication network described below, and the exemplary embodiment can be applied to various communication networks (e.g., 4G communication network, 5G communication network and / or 6G communication network). Here, "communication network" can be used interchangeably with the term "communication system".

[0064] Figure 1 is a conceptual diagram illustrating a first exemplary embodiment of a communication system.

[0065] like Figure 1 As shown, the communication system 100 may include a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5 and 130-6. In addition, the communication system 100 may further include: a core network (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (PDN gateway, P-GW), a mobility management entity (mobility management entity, MME)). When the communication system 100 is a 5G communication (e.g., an NR system), the core network may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0066] The plurality of communication nodes 110 to 130 may support communication protocols specified in the 3rd Generation Partnership Project (3GPP) standard (eg, LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). The plurality of communication nodes 110 to 130 may support the following technologies: code division multiple access (CDMA), wideband CDMA (WCDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiplexing (OFDM), filtered OFDM, cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier FDMA (SC-FDMA), non-orthogonal multiple access (NOMA), generalized frequency division multiplexing (GFDM), filter bank multi-carrier (filter bank The communication nodes may include a plurality of communication nodes, a plurality of communication nodes, and a plurality of communication nodes. The communication nodes may include a plurality of communication nodes, a plurality of communication nodes, and a plurality of communication nodes. The communication nodes may include a plurality of communication nodes, a plurality of communication nodes, and a plurality of communication nodes.

[0067] Figure 2 is a block diagram showing a first exemplary embodiment of a communication node constituting a communication system.

[0068] like Figure 2As shown, the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to a network for performing communication. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, etc. Each component included in the communication node 200 can communicate with each other when connected through a bus 270.

[0069] The processor 210 may execute a program stored in at least one of the memory 220 and the storage device 260. The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which a method according to an embodiment of the present invention is executed. Each of the memory 220 and the storage device 260 may be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0070] Reference again Figure 1 , the communication system 100 may include a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and a plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6. The communication system 100 including the base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and the terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 may be referred to as an "access network". Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell, and each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3 and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. In addition, the second terminal 130-2, the fourth terminal 130-4 and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. In addition, the fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5 and the sixth terminal 130-6 may belong to the cell coverage of the third base station 110-3. In addition, the first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1, and the sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

[0071] Here, each of the multiple base stations 110-1, 110-2, 110-3, 120-1 and 120-2 may refer to a Node-B, an evolved Node-B (eNB), a gNB, an advanced base station (ABS), a high reliability base station (HR-BS), a base transceiver station (BTS), a radio base station, a radio transceiver, an access point, an access node, a radio access station (RAS), a mobile multihop relay-base station (MMR-BS), a relay station (RS), an advanced relay station (ARS), a high reliability relay station (HR-RS), a home NodeB (HNB), a home eNodeB (HeNB), a road side unit (RSU), a radio remote head (RRH), a transmission point (transmission point point (TP), transmission and reception point (TRP), etc.

[0072] Each of the multiple terminals 130-1, 130-2, 130-3, 130-4, 130-5 and 130-6 may refer to user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), high reliability-mobile station (HR-MS), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, on-board unit (OBU), etc.

[0073] On the other hand, each of the multiple base stations 110-1, 110-2, 110-3, 120-1 and 120-2 can operate in the same frequency band or in different frequency bands. The multiple base stations 110-1, 110-2, 110-3, 120-1 and 120-2 can be connected to each other via an ideal backhaul or a non-ideal backhaul, and exchange information with each other via an ideal or non-ideal backhaul. In addition, each of the multiple base stations 110-1, 110-2, 110-3, 120-1 and 120-2 can be connected to the core network via an ideal or non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1 and 120-2 may transmit a signal received from the core network to a corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5 or 130-6, and transmit a signal received from a corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5 or 130-6 to the core network.

[0074] In addition, each of the multiple base stations 110-1, 110-2, 110-3, 120-1 and 120-2 can support multiple-input multi-output (MIMO) transmission (for example, single-user MIMO (SU-MIMO), multi-user MIMO (MU-MIMO), massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in unlicensed frequency bands, sidelink communication (for example, device-to-device (D2D) communication, proximity service (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc. Here, each of the multiple terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 may perform operations corresponding to the following: operations of the multiple base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and operations supported by the multiple base stations 110-1, 110-2, 110-3, 120-1, and 120-2. For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 in a SU-MIMO manner, and the fourth terminal 130-4 may receive a signal from the second base station 110-2 in a SU-MIMO manner. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 in a MU-MIMO manner, and the fourth terminal 130-4 and the fifth terminal 130-5 may receive a signal from the second base station 110-2 in a MU-MIMO manner.

[0075] The first base station 110-1, the second base station 110-2 and the third base station 110-3 can send signals to the fourth terminal 130-4 in a CoMP transmission manner, and the fourth terminal 130-4 can receive signals from the first base station 110-1, the second base station 110-2 and the third base station 110-3 in a CoMP manner. In addition, each of the multiple base stations 110-1, 110-2, 110-3, 120-1 and 120-2 can exchange signals with the corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5 or 130-6 belonging to its cell coverage in a CA manner. Each of base stations 110-1, 110-2 and 110-3 can control the sidelink communication between the fourth terminal 130-4 and the fifth terminal 130-5, so the fourth terminal 130-4 and the fifth terminal 130-5 can perform sidelink communication under the control of the second base station 110-2 and the third base station 110-3, respectively.

[0076] On the other hand, a communication node that performs communication in a communication network may be configured as follows. Figure 3 The communication nodes shown may be Figure 2 A specific exemplary embodiment of a communication node is shown.

[0077] Figure 3 is a block diagram illustrating a first exemplary embodiment of a communication node performing communications.

[0078] like Figure 3 As shown, each of the first communication node 300a and the second communication node 300b can be a base station or a UE. The first communication node 300a can send a signal to the second communication node 300b. The transmission processor 311 included in the first communication node 300a can receive data (e.g., data unit) from the data source 310. The transmission processor 311 can receive control information from the controller 316. The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE) or PHY control information (e.g., DCI, SCI).

[0079] The transmit processor 311 may generate data symbols by performing processing operations on data (e.g., encoding operations, symbol mapping operations, etc.). The transmit processor 311 may generate control symbols by performing processing operations on control information (e.g., encoding operations, symbol mapping operations, etc.). In addition, the transmit processor 311 may generate synchronization / reference symbols for synchronization signals and / or reference signals.

[0080] The Tx MIMO processor 312 may perform spatial processing operations (e.g., pre-coding operations) on data symbols, control symbols, and / or synchronization / reference symbols. The output (e.g., symbol stream) of the Tx MIMO processor 312 may be provided to a modulator (MOD) included in the transceivers 313a to 313t. The modulator may generate modulation symbols by performing processing operations on the symbol stream, and may generate signals by performing additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations, etc.) on the modulation symbols. The signals generated by the modulators of the transceivers 313a to 313t may be transmitted through the antennas 314a to 314t.

[0081] The signal transmitted by the first communication node 300a may be received at the antenna 364a to the antenna 364r of the second communication node 300b. The signal received at the antenna 364a to the antenna 364r may be provided to a demodulator (DEMOD) included in the transceiver 363a to the transceiver 363r. The demodulator (DEMOD) may obtain samples by performing processing operations (e.g., filtering operations, amplification operations, down-conversion operations, digital conversion operations, etc.) on the signal. The demodulator may perform additional processing operations on the samples to obtain symbols. The MIMO detector 362 may perform MIMO detection operations on the symbols. The receiving processor 361 may perform processing operations (e.g., deinterleaving operations, decoding operations, etc.) on the symbols. The output of the receiving processor 361 may be provided to the data sink. 360 and controller 366. For example, data may be provided to data sink 360, and control information may be provided to controller 366.

[0082] On the other hand, the second communication node 300b can send a signal to the first communication node 300a. The transmission processor 368 included in the second communication node 300b can receive data (e.g., data unit) from the data source 367, and perform processing operations on the data to generate data symbols. The transmission processor 368 can receive control information from the controller 366, and perform processing operations on the control information to generate control symbols. In addition, the transmission processor 368 can generate reference symbols by performing processing operations on reference signals.

[0083] The Tx MIMO processor 369 may perform spatial processing operations (e.g., pre-coding operations) on data symbols, control symbols, and / or reference symbols. The output (e.g., symbol stream) of the Tx MIMO processor 369 may be provided to a modulator (MOD) included in the transceiver 363a to the transceiver 363t. The modulator may generate modulation symbols by performing processing operations on the symbol stream, and may generate signals by performing additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations) on the modulation symbols. The signals generated by the modulators of the transceivers 363a to the transceivers 363t may be transmitted via the antennas 364a to the antennas 364t.

[0084] The signal transmitted by the second communication node 300b can be received at the antenna 314a to the antenna 314r of the first communication node 300a. The signal received at the antenna 314a to the antenna 314r can be provided to the demodulator (DEMOD) included in the transceiver 313a to the transceiver 313r. The demodulator can obtain samples by performing processing operations (e.g., filtering operations, amplification operations, down-conversion operations, digital conversion operations) on the signal. The demodulator can perform additional processing operations on the samples to obtain symbols. The MIMO detector 320 can perform MIMO detection operations on the symbols. The receiving processor 319 can perform processing operations (e.g., deinterleaving operations, decoding operations, etc.) on the symbols. The output of the receiving processor 319 can be provided to the data sink 318 and the controller 316. For example, data can be provided to the data sink 318, and control information can be provided to the controller 316.

[0085] Memory 315 and storage 365 may store data, control information and / or program codes. Scheduler 317 may perform scheduling operations for communications. Figure 3 The processors 311, 312, 319, 361, 368, 369 and the controllers 316 and 366 shown may be Figure 2 The processor 210 shown may be configured to execute the methods described in the present invention.

[0086] Figure 4a is a block diagram illustrating a first exemplary embodiment of a transmit path, Figure 4b is a block diagram illustrating a first exemplary implementation of a receive path.

[0087] like Figure 4a and Figure 4bAs shown, the transmission path 410 can be implemented in a communication node that transmits a signal, and the reception path 420 can be implemented in a communication node that receives a signal. The transmission path 410 may include: a channel coding and modulation block 411, a serial-to-parallel (S to P) block 412, an N-point inverse fast Fourier transform (N-point IFFT) block 413, a parallel-to-serial (P to S) block 414, a cyclic prefix (CP) adding block 415 and an up-converter (UC) 416. The reception path 420 may include a down-converter (DC) 421, a CP deletion block 422, an S to P block 523, an N-point FFT block 424, a P to S block 425 and a channel decoding and demodulation block 426. Here, N may be a natural number.

[0088] In the transmission path 410, the information bits may be input to the channel coding and modulation block 411. The channel coding and modulation block 411 may perform coding and decoding operations (e.g., low-density parity check (LDPC) coding and decoding operations, polar coding and decoding operations, etc.) and modulation operations (e.g., quadrature phase shift keying (OPSK), quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block 411 may be a modulation symbol sequence.

[0089] The S to P block 412 may convert the frequency domain modulation symbols into parallel symbol streams to generate N parallel symbol streams. N may be an IFFT size or an FFT size. The N-point IFFT block 413 may generate a time domain signal by performing an IFFT operation on the N parallel symbol streams. The P to S block 414 may convert the output (e.g., parallel signals) of the N-point IFFT block 413 into a serial signal to generate a serial signal.

[0090] The CP adding block 415 may insert the CP into the signal. The UC 416 may up-convert the frequency of the output of the CP adding block 415 to a radio frequency (RF) frequency. In addition, the output of the CP adding block 415 may be filtered in baseband before up-conversion.

[0091] The signal transmitted from the transmission path 410 may be input to the reception path 420. The operation in the reception path 420 may be the reverse operation of the operation in the transmission path 410. The DC 421 may down-convert the frequency of the received signal to the baseband frequency. The CP removal block 422 may remove the CP from the signal. The output of the CP removal block 422 may be a serial signal. The S to P block 423 may convert the serial signal into a parallel signal. The N-point FFT block 424 may generate N parallel signals by performing an FFT algorithm. The P to S block 425 may convert the parallel signal into a modulation symbol sequence. The channel decoding and demodulation block 426 may perform a demodulation operation on the modulation symbol, and may recover the data by performing a decoding operation on the result of the demodulation operation.

[0092] exist Figure 4a and Figure 4b In the present invention, discrete Fourier transform (DFT) and inverse DFT (IDFT) can be used to replace FFT and IFFT. Figure 4a and Figure 4b Each of the blocks (eg, components) in the embodiment may be implemented by at least one of hardware, software, or firmware. Figure 4a and Figure 4b Some blocks in the can be implemented by software, and other blocks can be implemented by hardware or a combination of hardware and software. Figure 4a and Figure 4b In the , a block can be subdivided into multiple blocks, multiple blocks can be integrated into one block, some blocks can be omitted, and blocks that support other functions can be added.

[0093] Figure 5 is a conceptual diagram illustrating a first exemplary embodiment of a system frame in a communication system.

[0094] like Figure 5 As shown, the time resources in the communication system can be divided on a frame basis. For example, the system frame of the communication system can be configured continuously in the time domain. The length of the system frame can be 10 milliseconds (ms). The system frame number (SFN) can be set to one of #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0095] One system frame may include two half frames. The length of the half frame may be 5 ms. The half frame located at the start area of ​​the system frame may be referred to as "half frame #0", and the half frame located at the end area of ​​the system frame may be referred to as "half frame #1". One system frame may include 10 subframes. The length of one subframe may be 1 ms. The 10 subframes within one system frame may be referred to as subframe #0-subframe #9.

[0096] Figure 6 is a conceptual diagram illustrating a first exemplary embodiment of a subframe in a communication system.

[0097] like Figure 6 As shown, a subframe may include n time slots, where n may be a natural number. Accordingly, a subframe may consist of one or more time slots.

[0098] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of a time slot in a communication system.

[0099] like Figure 7 As shown, a time slot may include one or more symbols. For example, Figure 7 One slot shown in may include 14 symbols. The length of the slot may vary according to the number of symbols included in the slot and the length of the symbol. Alternatively, the length of the slot may vary according to a parameter set.

[0100] The parameter set applied to the physical signal and channel in the communication system can be variable. The parameter set can be adjusted to meet various technical requirements of the communication system. In a communication system applying OFDM waveform technology based on cyclic prefix (CP), the parameter set may include subcarrier spacing and CP length (or CP type). Table 1 may show a first exemplary embodiment of a method for configuring a parameter set of a communication system based on CP-OFDM. Depending on the frequency band in which the communication system operates, at least some of the parameter sets in Table 1 may be supported. In addition, the communication system may support parameter sets not listed in Table 1.

[0101] [Table 1]

[0102]

[0103] When the subcarrier spacing is 15kHz (e.g., μ=0), the length of the time slot may be 1ms. In this case, one system frame may include 10 time slots. When the subcarrier spacing is 30kHz (e.g., μ=1), the length of the time slot may be 0.5ms. In this case, one system frame may include 20 time slots.

[0104] When the subcarrier spacing is 60kHz (e.g., μ=2), the length of the time slot may be 0.25ms. In this case, one system frame may include 40 time slots. When the subcarrier spacing is 120kHz (e.g., μ=3), the length of the time slot may be 0.125ms. In this case, one system frame may include 80 time slots. When the subcarrier spacing is 240kHz (e.g., μ=4), the length of the time slot may be 0.0625ms. In this case, one system frame may include 160 time slots.

[0105] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A time slot consisting only of DL symbols may be referred to as a "DL time slot", a time slot consisting only of FL symbols may be referred to as a "FL time slot", and a time slot consisting only of UL symbols may be referred to as a "UL time slot".

[0106] The slot format can be semi-statically configured by higher layer signaling (e.g., RRC signaling). Information indicating the semi-static slot format can be included in the system information, and the semi-static slot format can be configured to be cell-specific. In addition, the semi-static slot format can be further configured for each terminal by terminal-specific high-layer signaling (e.g., RRC signaling). The flexible symbols in the cell-specific slot format can be overwritten as downlink symbols or uplink symbols by terminal-specific high-layer signaling. In addition, the slot format can be dynamically indicated by physical layer signaling (e.g., a slot format indicator (SFI) included in the DCI). The semi-statically configured slot format can be overwritten by the dynamically indicated slot format. For example, the semi-statically configured flexible symbols can be overwritten by the SFI as downlink symbols or uplink symbols.

[0107] Reference signals may include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a Demodulation-Reference Signal (DM-RS), and a Phase Tracking-Reference Signal (PT-RS). Channels may include a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Control Channel (PUCCH), a Physical Uplink Shared Channel (PUSCH), a Physical Sidelink Control Channel (PSCCH), and a Physical Sidelink Shared Channel (PSSCH). In the present invention, the control channel may refer to PDCCH, PUCCH or PSCCH, and the data channel may refer to PDSCH, PUSCH or PSSCH.

[0108] Figure 8 is a conceptual diagram illustrating a first exemplary implementation of time-frequency resources in a communication system.

[0109] like Figure 8 As shown, a resource consisting of one OFDM symbol on the time axis and one subcarrier on the frequency axis can be defined as a "resource element (RE)". A resource consisting of one OFDM symbol on the time axis and K subcarriers on the frequency axis can be defined as a "resource element group (REG)". A REG may include K REs. REG may be used as a basic unit for resource allocation in the frequency domain. K may be a natural number. For example, K may be 12. N may be a natural number. Figure 7 In the illustrated time slot, N may be 14. N OFDM symbols may be used as a basic unit for resource allocation in the time domain.

[0110] In the present invention, RB may refer to a common RB (CRB). Alternatively, RB may refer to a physical RB (PRB) or a virtual RB (VRB). In a communication system, CRB may refer to an RB that constitutes a set of continuous RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). A carrier and / or bandwidth part may be mapped to a common RB grid. That is, a carrier and / or bandwidth part may be configured with CRBs. An RB or CRB constituting a bandwidth part may be referred to as a PRB, and a CRB index may be appropriately converted to a PRB index within a bandwidth part.

[0111] Downlink data can be transmitted through PDSCH. The base station can send configuration information (e.g., scheduling information) of PDSCH to the terminal through PDCCH. The terminal can obtain the configuration information of PDSCH by receiving PDCCH (e.g., downlink control information (DownlinkControl Information, DCI)). For example, the configuration information of PDSCH may include the modulation coding scheme (MCS) used for sending / receiving PDSCH, the time resource information of PDSCH, the frequency resource information of PDSCH, and the feedback resource information of PDSCH. PDSCH may refer to the radio resources for sending and receiving downlink data. Alternatively, PDSCH may refer to the downlink data itself. PDCCH may refer to the radio resources for sending and receiving downlink control information (e.g., DCI). Alternatively, PDCCH may refer to the downlink control information itself.

[0112] The terminal may perform a monitoring operation on the PDCCH to receive the PDSCH sent from the base station. The base station may notify the terminal of configuration information for the PDCCH monitoring operation using a high-level message (e.g., a Radio Resource Control (RRC) message). The configuration information for the PDCCH monitoring operation may include control resource set (ControlResource Set, CORESET) information and search space information.

[0113] CORESET information may include PDCCH DMRS information, PDCCH precoding information, and PDCCH timing information, etc. PDCCH DMRS may be a DMRS used to demodulate PDCCH. PDCCH timing refers to an area where PDCCH may potentially exist, which means that it is an area where DCI can be transmitted. PDCCH timing may also be referred to as a PDCCH candidate. PDCCH timing information may include time resource information and frequency resource information for PDCCH timing. In the time domain, the length of the PDCCH timing may be indicated in symbols. In the frequency domain, the size of the PDCCH timing may be indicated in RB units (e.g., in PRB units or CRB units).

[0114] The search space information may include a CORESET identifier (ID) associated with the search space, a periodicity of PDCCH monitoring, and / or an offset of PDCCH monitoring. The periodicity and offset of PDCCH monitoring may each be indicated in units of time slots. In addition, the search space information may further include an index of a symbol at which the PDCCH monitoring operation starts.

[0115] The base station may configure a bandwidth part (Bandwidth Part, BWP) for downlink communication. The BWP may be configured differently for each terminal. The base station may notify the terminal of BWP configuration information using high-level signaling. High-level signaling may refer to a transmission operation of system information and / or a transmission operation of an RRC message. The number of BWPs configured for a single terminal may be one or more. The terminal may receive BWP configuration information from the base station and identify the configured BWP based on the received configuration information. When multiple BWPs are configured for downlink communication, the base station may activate one or more BWPs in the multiple BWPs. The base station may send configuration information of the activated BWP to the terminal using at least one of high-level signaling, a medium access control (MAC) control element (CE) or a DCI. The base station may perform downlink communication using the activated BWP. The terminal may identify the activated BWP by receiving configuration information from the base station and perform a downlink reception operation on the activated BWP.

[0116] On the other hand, in 5G NR, multi-transmission and reception point (MTRP) technology refers to the technology that gNB uses physically separated multiple TRPs to communicate with terminals. MTRP technology helps to solve the problem of reduced quality of service (QoS) of cell edge terminals far away from the base station, and alleviates inter-cell interference from base stations in different cells. In addition, it helps to provide alternative communication paths in environments with limited non-line-of-sight (NLOS) paths (such as in the millimeter wave band).

[0117] In the current standard, MTRP technology is classified into a coherent joint transmission (CJT) scheme and a non-coherent joint transmission (NCJT) scheme. In the CJT scheme, TRPs collaborate in a synchronous manner based on a reliable backhaul link between base stations connected to the TRPs. On the other hand, in the NCJT scheme, scheduling, pre-coding matrix selection, modulation, and coding schemes are determined uncoordinatedly between multiple TRPs supporting a single terminal.

[0118] Therefore, in order to perform efficient communication while controlling interference between TRPs, communication technologies of different TRPs need to be considered. In this regard, 3GPP has agreed that the transmission time, transmission period and transmission power of the synchronization signal block (SSB) of the non-service cell need to be controlled during the inter-cell MTRP operation process. However, the agreement on such resource allocation is limited to SSB, and the case of transmitting information after the cell search process has not been discussed. In addition, when a terminal receives signals from multiple TRPs, only a single bandwidth part (BWP) can be activated in the terminal. However, when the NCJT scheme is utilized according to the current standard, since multiple TRPs support a single terminal without collaboration, it is impossible to ensure that the subcarrier spacing (SCS), cyclic prefix, Fast Fourier Transform (FFT) size and frequency band of the signal sent to the same terminal are consistent. Therefore, when the NCJT scheme is utilized in an MTRP environment, new resource allocation techniques for synchronization between TRPs need to be considered.

[0119] In addition, 3GPP is discussing various situations where MTRP should be considered. For example, it has been agreed that all intra-cell and inter-cell MTRP schemes specified in the unified TCI framework extension should be considered. In addition, it has been agreed that at least in the unified TCI framework extension for a single DCI-based MTRP, the existing TCI field of DCI format 1_1 / 1_2 is used to indicate multiple joint / DL / UL TCI states of a CC / BWP or CC / BWP set of a CC list. In addition, it has been agreed that further solutions for TCI status updates should be considered to extend the unified TCI framework for M-DCI-based MTRP.

[0120] The above protocol does not provide a specific method for MTRP support.

[0121] In the 5G NR that has been standardized so far, the communication process using MTRP is supported to improve the performance and efficiency of MIMO. The CJT or NCJT scheme in the MTRP technology can be determined according to the environment of the cell where the current TRP exists, the backhaul link connectivity, etc. In addition, depending on which scheme is selected between the CJT and NCJT schemes in the MTRP technology, it can be determined whether multiple TRPs collaborate to support one terminal (CJT scheme) or each TRP independently supports one terminal (NCJT scheme).

[0122] The present invention assumes the case where multiple TRPs support a single terminal in an MTRP NCJT environment. Specifically, the present invention considers the case where additional user data will be sent to the terminal when the terminal is currently communicating with a TRP corresponding to a serving cell. In the environment considered in this article, it may not be possible to determine which TRP to select and which resources to allocate for communication between the selected TRP and the terminal based solely on information about the physical cell ID (PCI) and SSB of the non-serving cell, which has been agreed upon in the current 5G NR standard. In particular, when a TRP is communicating with a terminal and wishes to send additional user data to the terminal, due to the characteristics of the terminal, there are physical limitations on receiving additional user data from TRPs other than the existing TRP. In addition, during the process of allocating additional resources, when the existing TRP cannot allocate resources, or when the new TRP can provide better additional resources than the existing TRP, due to the lack of cooperation between TRPs under the current standard, the new TRP cannot allocate resources to the terminal.

[0123] Therefore, when it is desired to send additional user data to the terminal, an information transfer process is required for collaboration between the TRP currently communicating and another TRP that can serve the terminal. For the case where a TRP corresponding to a serving cell is communicating with a terminal in an MTRP NCJT environment, the present invention provides a method for allocating additional resources for communication between an existing TRP and a terminal and performing additional transmission when it is desired to send additional user data to the terminal. In addition, for the case where a TRP corresponding to a serving cell communicates with a terminal in an MTRP NCJT environment, the present invention provides a method for a new TRP to perform additional transmission. In addition, the present invention provides a benchmark and process for selecting one of the above two schemes. In addition, the present invention provides a new resource allocation method, which solves the problem that multiple TRPs could not previously support one terminal by transmitting information, so that the new TRP can set a suitable SCS, cyclic prefix, FFT size, frequency band, etc. by considering the communication link between the existing TRP and the terminal when selecting a new TRP.

[0124] In the present invention described below, the case where two TRPs (eg, TRP A and TRP B) support one terminal in an MTRP NCJT environment will be considered for description. However, the present invention can also be applied to a case where three or more TRPs support one terminal.

[0125] In the present invention, a case where additional user data is to be sent to a terminal when the terminal is communicating with one TRP (TRP A) is considered. For this case, the present invention proposes a technique for selecting a TRP for performing additional user data transmission among TRP A currently communicating with the terminal and TRP B currently not communicating with the terminal, and allocating resources in consideration of the communication link with the existing TRP A. Specifically, the present invention can provide a method for configuring a benchmark for selecting an additional TRP for transmitting user data, a process (procedure) for exchanging information about performance related thereto, a method for selecting an optimal TRP for additional user data transmission based on performance, and a method for allocating additional resources to the selected TRP.

[0126] First, when the terminal receives information (or user data) from TRP A corresponding to the serving cell and needs to send additional user data to the terminal, the terminal can send information about the performance of TRP B received from TRP B corresponding to the non-serving cell to TRP A. Then, TRP A can compare its own performance with the performance of TRP B to determine which TRP to send information to additionally. If the performance of TRP A is determined to be better, the TRP ID of the selected TRP A can be sent to the terminal as information for TRP identification, and information about additional resources can be sent together.

[0127] On the other hand, if TRP A determines that TRP B has better performance based on the result of comparing its own performance with that of TRP B and determines which TRP is to transmit additional information, the TRPID of the selected TRP B can be sent to the terminal as information for TRP identification. In addition, TRP A can send information about the SCS, cyclic prefix, FFT size, etc. currently used by TRP A to the terminal. Then, the terminal can deliver information about the SCS, cyclic prefix, FFT size, etc. received from TRP A to TRP B. TRP B, which receives information about the SCS, cyclic prefix, FFT size, etc. used by TRP A from the terminal, can allocate resources for sending additional user data to the terminal based on the information received from the terminal.

[0128] In the technology according to the present invention, the transmission scheme can be changed according to the RRC connection state between the terminal and TRP B as a non-serving cell. When the terminal is RRC connected with TRP B as a non-serving cell, the transmission can be performed in the same manner as in TRP A as a serving cell. The terminal can be assumed to be in a multi-connection state, in which it is RRC connected with TRP A and TRP B (i.e., multiple TRPs).

[0129] If multiple connections are not possible, the terminal can establish a temporary RRC connection with the base station of the non-serving cell by sending an RRC connection establishment request message to the base station of the non-serving cell. In order to notify the establishment of the temporary RRC connection, the terminal can use the RRC connection establishment cause included in the RRC connection establishment request message. For example, the terminal can send an RRC connection establishment cause to the base station of the non-serving cell, thereby indicating that the RRC connection establishment is to transmit information about the TRP of the serving cell. Through this process, the terminal can establish a temporary RRC connection with the base station of the non-serving cell.

[0130] When establishing a temporary RRC connection with a base station of a non-service cell in the above manner, the terminal may send information about the TRP of the service cell to the base station of the non-service cell. Then, after receiving the information about the TRP of the service cell, the base station of the non-service cell may release the connection by sending RRC connection suspension information for releasing the temporary RRC connection with the terminal to the terminal.

[0131] During the connection release process, the base station of the non-service cell can instruct the terminal to perform periodic reporting related to the MTRP operation through an RRC connection release message. For example, when the configuration of the serving cell changes or the configuration of the serving cell changes non-periodically, the base station of the non-service cell can instruct the terminal to transmit the corresponding information. The terminal that receives such indication information can establish an RRC connection with the non-service cell at a specific period or whenever it identifies a change in the configuration of the serving cell after releasing the RRC connection with the base station of the non-service cell. The terminal can then repeat the process of sending the configuration of the serving cell to the non-service cell and then releasing the RRC connection. These RRC connection establishment and release processes may include processes such as RRC recovery request, RRC recovery, and RRC recovery completion.

[0132] On the other hand, when the terminal is in an RRC invalid state with TRP B, they cannot proceed in the same manner as the RRC signaling scheme of TRP A, and the signaling scheme that is possible in the RRC invalid state can be utilized. For example, when the terminal is in an RRC invalid state with TRP B, information such as SN RRC reconfiguration, SN RRC reconfiguration completion, SN measurement report, and SN UE auxiliary information can be sent through SRB3. The necessary processes for SRB3 operation can be performed based on the process in which the terminal notifies the serving cell of the non-serving cell that will support MTRP by transmitting information about the non-serving cell, the process in which the serving cell configures dual connections between the terminal and the non-serving cell, and the process in which the SRB is established between the non-serving cell and the terminal. In this case, the relevant processes can be performed through the SgNB add request, SgNB add request confirmation, RRC connection reconfiguration, RRC connection reconfiguration completion, and SgNB reconfiguration completion messages in the existing SRB3 establishment process. As another example, the relevant processes can be performed using new parameters. The present invention described below assumes that the above-mentioned processes for SRB3 establishment have been performed when TRP B and the terminal are in an RRC invalid state.

[0133] In the following description, terminal may refer to user equipment (UE) or be interchangeable with user equipment (UE), and UE may refer to terminal or be interchangeable with terminal. In addition, the TRP described below may have at least partially overlapping communication areas.

[0134] (1) When it is necessary to additionally send user data in an MTRP environment, configure the criteria for TRP selection and the processing of delivery performance information

[0135] In the present invention, it is assumed that in an MTRP NCJT environment, two TRPs (e.g., TRP A and TRP B) support a single terminal, and when the terminal communicates with TRP A, additional user data needs to be sent to the terminal. In this case, from the perspective of the terminal, there may be a method of receiving additional user data transmission by allocating more resources for communication with TRP A, that is, a method of receiving additional user data from TRP A, and a method of selecting TRP B and receiving additional user data transmission from TRP B, which is a new TRP.

[0136] Fig. 9 is a signal flow chart of operations for terminals to obtain information about TRPs from TRPs respectively in an MTRP NCJT environment according to an exemplary embodiment.

[0137] like Fig. 9 As shown, since TRP A 901 and TRP B 902 are assumed to be in an NCJT environment, there may be a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. Terminal 911 may be in a state where a communication link can be established with TRP A 901 and information about TRP A 901 can be received from TRP A 901. In addition, terminal 911 may be in a state where a communication link can be established with TRP B 902 and information about TRP B 902 can be received from TRP B 902. In this case, TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0138] In order to solve the asynchronization problem between TRPs in the MTRP NCJT environment, the terminal 911 can identify the TRP ID as identification information of all TRPs communicating with the terminal 911 and information about the frequency band allocated to each TRP. In other words, in step S910a, the terminal 911 can receive information about the TRP ID of TRP A 901 and information FrequencyInfoDL about the frequency band of TRP A 901, and in step S910b, the terminal 911 can receive information about the TRP ID of TRP B 902 and information FrequencyInfoDL about the frequency band of TRP B 902. Fig. 9 In the example, only two TRPs 901 and TRP 902 are illustrated, but when connected to three or more TRPs, the terminal 911 can obtain information about the TRP ID and frequency band of each TRP of all the TRPs.

[0139] In the present invention, the desynchronization problem between TRP 901 and TRP 902 in the NCJT environment can be solved by Terminal 911. Therefore, in the process of Terminal 901 acting as an intermediate repeater, the process of selecting the best TRP, and the process of the selected TRP sending additional user data to Terminal 911, information about the TRP ID and the frequency band can be used.

[0140] Again Fig. 9 In step S910a, TRP A 901 as a serving cell may send information about its own TRP ID and its own frequency band to terminal 911. As a method for TRP A 901 to send information to terminal 911, at least one of SIB, DCI, RRC reconfiguration message or new RRC signaling message may be used. Information about TRP ID and frequency band of TRP may be referred to as "TRP information".

[0141] In addition, when TRP B 902 is RRC-connected with the terminal 911, TRP B 902 as a non-serving cell may transmit information about its own TRP ID and its own frequency band to the terminal 911 in the same manner as the process of TRP A 901 in step S910b. In other words, TRP B 902 as a non-serving cell that is RRC-connected with the terminal 911 may transmit TRP information to the terminal 911. In this case, TRP B 902 may transmit TRP information to the terminal 911 using at least one of SIB, DCI, RRC reconfiguration message, or new RRC signaling message.

[0142] If TRP B 902 as a non-serving cell is in an RRC invalid state with the terminal 911, TRP B 902 can transmit information about its own TRP ID and its own frequency band, that is, TRP information, using at least one of SIB, DCI, Msg2 or MsgB in step S910b.

[0143] Terminal 911 can deliver information about TRP ID and frequency band (ie, TRP information) received from each TRP to other TRPs.

[0144] For example, the terminal 911 may deliver the TRP information of TRP A 901 to other TRPs, for example, TRP B 902, by using UCI, UE assistance information, or a new RRC signaling message in step S910a.

[0145] In addition, when TRP B 901 (i.e., non-service cell) is in an RRC connection state with terminal 911, terminal 911 can deliver the TRP information received from other TRPs in step S910b to TRP B 902 via UCI, UE auxiliary information or a new RRC signaling message, which is the same as the case of TRP A 901.

[0146] If the terminal 911 and TRP B 902 are in an RRC invalid state, the terminal 911 can deliver the TRP information received from other TRPs in step S910b to TRP B 902 through Msg1 or MsgA, or using the SN UE assistance information of the SRB3 or new SRB3 signaling message.

[0147] Through the above Fig. 9 By performing the process, all TRPs connected to the terminal 911 can identify each other's TRP ID and frequency band. Additionally or alternatively, all TRPs connected to the terminal 911 can establish a backhaul that can directly exchange information between base stations connected to all TRPs by exchanging TRP ID information with each other via the terminal 911.

[0148] Above Fig. 9 It may correspond to a process for exchanging information through terminal 911, since synchronization between TRPs is impossible in the MTRP NCJT environment. In other words, terminal 911 may identify (or obtain) a TRP ID, which is identification information of all TRPs communicating with it. In addition, terminal 911 may send TRP information of all TRPs connected to terminal 911, in other words, information about the TRP ID of the corresponding TRP and information about the frequency band allocated to the corresponding TRP, to all TRPs, so that all TRPs currently communicating with the terminal can recognize the existence of other TRPs.

[0149] pass Fig. 9 The information that the process can obtain from the terminal 911 can be exemplified as shown in Table 2 below. In addition, the terminal 911 can send the information in Table 2 or the remaining information in Table 2 except the corresponding TRP information to each TRP communicating with the terminal 911. Thus, all TRPs communicating with the terminal 911 can obtain the information in Table 2 below.

[0150] [Table 2]

[0151] TRP TRP information obtained TRPA TRP ID_A, FrequencyInfoDL_A TRP B TRP ID_B, FrequencyInfoDL_B

[0152] Described above Fig. 9 The exemplary embodiment may be used in combination with at least one of the other exemplary embodiments described below.

[0153] Fig.10is a signal flow diagram according to an exemplary embodiment of information transmission for determining TRP selection criteria in an MTRP NCJT environment.

[0154] like Fig.10 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Fig. 9 The example is performed in the same manner as described in . Therefore, Fig.10 The process also assumes the NCJT environment. In other words, Fig.10 This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. The terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0155] Fig.10 Assume that TRP A901 wants to send additional user data to terminal 911. In this case, since terminal 911 is in an MTRP environment, it is necessary to select a TRP that sends additional user data. Therefore, a selection benchmark for TRP to send additional user data in an MTRP environment can be configured first. Various factors can be considered for the selection benchmark for TRP to send additional user data. In the present invention described below, a method for using the reference signal received power (RSRP) of SSB as a selection benchmark for TRP to send additional user data will be described. In addition, in the present invention, a method for using frequency resource utilization of public frequency bands of different TRPs as a selection benchmark for TRP to send additional user data will be described. To help understand, in the present invention, the RSRP of SSB and / or the frequency resource utilization for public frequency bands will be described as a selection benchmark for TRP to send additional user data. However, the present invention is not limited to this, and other selection benchmarks can be used. For example, factors such as the load level of TRP, the transmission power level of TRP, the mobility of the terminal, and the delay level required by the terminal can additionally or partially replace other benchmarks.

[0156] In step S1010a, TRP A901 may send TRP selection reference information to terminal 911. In this case, the TRP selection reference information may be transmitted by being included in a report request signal or a report request message. For ease of description, the following description will be made assuming that the TRP selection reference information is transmitted by being included in a report request message. The report request message may be a message requesting terminal 911 to report information corresponding to the TRP selection reference based on the TRP selection reference information. The report request message may indicate a specific TRP. For example, Fig. 9 As described in , such indication of TRP can be made based on information previously obtained by terminal 911. For example, if TRP A901 is Fig. 9 In the manner described in the above, the report request message may include three TRP IDs. In addition, the report request message may include TRP selection reference information. The reference used as the TRP selection reference may be arbitrarily configured or pre-configured by TRP A 901. The TRP selection reference information may be indicated by an SIB or RRC reconfiguration message. In the present invention, as described above, it may be assumed that the RSRP of the SSB and / or the frequency resource utilization for the public frequency band are used.

[0157] First, TRP A 901 can be Fig. 9 The process of the present invention is aware of the existence of TRP B 902 that can communicate with the terminal 911 in advance. The strength of the signal received from each TRP can be used as a TRP selection reference for additional data transmission. Accordingly, TRP A 901 can instruct the terminal 911 to perform a measurement report of the RSRP of the SSB received from TRP B 902.

[0158] In addition, if TRP A 901 implements the above Fig. 9 , TRP A 901 can know the common frequency band of TRP A 901 and TRP B 902 based on the TRP information received from the terminal 911. Therefore, TRP A 901 can configure the information about the frequency resource utilization ratio of the common frequency band of TRP B 902 as the TRP selection reference and send it to the terminal 911. As the information about the frequency resource utilization ratio of the common frequency band of TRP A and TRP B, the parameter frequencyResourceUtilization defined in the present invention can be used. The parameter frequencyResourceUtilization defined in the present invention can be a value representing the ratio of the degree to which each TRP is using the corresponding frequency band based on the common frequency band of the TRPs (i.e., TRP A 901 and TRP B 902) that can communicate with the terminal 901.

[0159] As described above, the information that needs to be requested from another TRP (e.g., TRP B 902) as a basis for selecting a TRP to send additional user data may be resource utilization information of the TRP. The resource utilization information is described as a ratio of the extent to which each TRP is using the corresponding frequency band based on the common frequency band of the TRP described in the present invention, but may include a load ratio of the TRP (i.e., a load ratio of TRP B). As another example, the resource utilization information may include the transmission power of TRP B 902. It will be apparent to those skilled in the art that various other information may correspond to the resource utilization information of the TRP.

[0160] The selection reference information for additional user data transmission may be indicated to the terminal 911 using the UEInformationRequest IE of the RRC signaling. Accordingly, in step S1010a, the terminal 911 may be instructed to measure and report the RSRP of the SSB received from TRP B 902 and / or report TRP B 902's frequency resource utilization of the common frequency band of TRP A and TRP B. As another example, when transmitting information indicating that the terminal 911 measures and reports the SSB of TRP B 902 and / or reports the frequency resource utilization of TRP B 902, TRP A 901 may use SIB, RRC reconfiguration, or new signaling.

[0161] Upon receiving the report request message including the TRP selection reference information for additional user data transmission at step S1010a, the terminal 911 may identify the target TRP based on the received TRP selection reference information. Fig.10 Only two TRPs are exemplified in the example, and the target TRP may be TRP B 902. In addition, the terminal 911 may identify information that needs to be requested from TRP B 902 based on the received TRP selection reference information. For example, if both the measurement report of the RSRP of the SSB from TRP B 902 and the report of the frequency resource usage ratio of the common frequency band of TRP A and TRP B are indicated by the TRP selection reference information in step S1010a, the terminal 911 may identify that information on the frequency resource usage ratio of TRP B of the common frequency band of TRP A and TRP B is information that needs to be requested from TRP B 902. In this case, as described above, the instruction for reporting the frequency resource usage ratio of the common frequency band of TRP A and TRP B may use UEInformationRequest IE.

[0162] Based on the identification in step S1010a, in step S1010b, the terminal 911 may request or query TRP B 902 for frequency resource utilization information of the common frequency band of TRP A and TRP B to obtain frequency resource utilization information of the common frequency band of TRP A and TRP B.

[0163] In step S1010b, if the terminal 911 and TRP B 902 are RRC connected, the terminal 911 may use UCI or new RRC signaling to request or query TRP B for frequency resource utilization information of the common frequency band of TRP A and TRP B. As another example, in step S1010b, if the terminal 911 and TRP B 902 are in an RRC invalid state, the terminal 911 may use Msg1, Msg A or SRB3 signaling defined for transmission request according to the present invention to request or query TRP B 902 for frequency resource utilization information of the common frequency band of TRP A and TRP B. The SRB3 signaling defined in the present invention may have a field for requesting frequency resource utilization information of the common frequency band of TRP A and TRP B.

[0164] Based on the above process, TRP B 902 may receive a request or inquiry message for frequency resource usage ratio information of a common frequency band of TRP A and TRP B from Terminal 911 in step S1010b.

[0165] In response, TRP B 902 may generate frequency resource utilization ratio information as a response message at step S1020 and send it to the terminal 911. At step S1020, if the terminal 911 and TRP B 902 are RRC connected, the frequencyResourceUtilization IE including the frequency resource utilization ratio information of the common frequency band of TRP A and TRP B may be sent to the terminal 911 by being included in the RRC signaling. In this case, the response message may be transmitted through the RRC signaling.

[0166] In step S1020, if the terminal 911 and TRP B 902 are in the RRC invalid state, the frequencyResourceUtilization IE including the frequency resource utilization ratio information of the common frequency band of TRP A and TRP B may be transmitted to the terminal 911 through Msg2 or MsgB. In this case, the response message may be transmitted through Msg2 or MsgB.

[0167] On the other hand, if there is no information to be requested (or queried) and received from TRP B 902, such as frequency resource usage ratio information of a common frequency band of TRP A and TRP B, according to the TRP selection reference information, step S1010b and step S1020 may be omitted. For example, if the TRP selection reference indicated in step S1010a includes only information for measuring the received power of a reference signal included in an SSB received from TRP B 902 and reporting RSRP, step S1010b and step S1020 may be omitted.

[0168] In the above exemplary embodiment, the process of obtaining RSRP by measuring the received power of the reference signal included in the SSB received from TRP B 902 is well known. Fig.10 In the present invention, the detailed description of the process of the terminal 901 obtaining the RSRP for SSB from the TRP B 902 is omitted.

[0169] Described above Fig.10 This may correspond to an example in which a reference for TRP selection is configured as SSB RSRP and a frequency resource usage ratio. Fig.10 The exemplary embodiment of the present invention may be modified in other forms. For example, the TRP selection criterion may be pre-configured by each TRP or the serving TRP to the terminal 911. When the TRP selection criterion is pre-configured to the terminal 911, the serving TRP may send a report indication message to the terminal when additional user data transmission is required, thereby performing Fig.10 As described above, when the TRP selection benchmark is pre-configured to the terminal 911, the TRP A901 can instruct the terminal 911 to report the frequency resource usage ratio of the SSB RSRP and other TRPs to the TRP A901 through SIB or RRC reconfiguration when the TRP selection process needs to be performed.

[0170] According to the above description Fig.10 The process, TRP base and information TRP B 902 sends to terminal 911 or terminal 911 obtains from TRP B 902 can be summarized as shown in the following Table 3.

[0171] [Table 3]

[0172] TRP Selection Benchmark Information (TRP B→Terminal) SSB RSRP SSB Frequency resource utilization ratio requencyResourceUtilization

[0173] On the other hand, the above described Fig.10 The exemplary embodiments can be used with Fig. 9 The exemplary embodiments and / or at least one of the exemplary embodiments to be described below may be used in combination.

[0174] Fig.11 is a signal flow diagram according to an exemplary embodiment, in which a terminal sends TRP selection reference information obtained from another TRP to a serving TRP in an MTRP NCJT environment.

[0175] like Fig.11 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Fig. 9 The example is performed in the same manner as described in . Therefore, Fig.11 The process also assumes the NCJT environment. In other words, Fig.11 This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. Terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0176] Fig.11 It can be shown that the terminal 911 is based on the above Fig.10 The information received in the process of measuring the SSB RSRP of TRP B 902 and sending the SSB RSRP and / or frequency resource utilization information together with the TRP ID of TRP B 902 to TRP A 901. In other words, in the process of executing Fig.10 After at least part of the process is executed Fig.11 As another example, if TRP A 901 instructs Terminal 911 to report information related to the selection benchmark of TRP B 902 at a preset period, Terminal 911 may report information related to the TRP selection benchmark pre-indicated by TRP A 901 to TRP B 902 at a specific period.

[0177] In the following description, for the convenience of description, Fig.11 The process is assumed to be Fig.10 That is, assuming Fig.11 The process is Fig.10 The process after step S1020.

[0178] In execution Fig.11Prior to step S1110, the terminal 911 may have been instructed (or requested) by the TRP A 901 to perform a report related to the TRP selection benchmark of the TRP B 902 in advance through the UEInformationRequest of the RRC signaling. As described above, the report instruction (or request) may include a request for SSB measurement and a report of the TRP B 902 and / or a request for a frequency resource utilization ratio report of the TRP B 902, and the report instruction may be made using the UEInformationRequest message as the RRC signaling.

[0179] Terminal 911 may have been Fig.10 The process obtains all the information to be reported (or responded) to TRP A901. Therefore, Terminal 911 can Fig.10 The information obtained by the process is included in the report (or response) message, and is sent to TRP A901 in step S1110. As the report message sent in step S1110, the UEInformationResponse message can be used. As another example, the report message sent in step S1110 can use UCI, measurement report, UE auxiliary information, etc. As another example, according to the present invention, the report message sent in step S1110 can use RRC signaling defined as reporting TRP selection benchmark response. As another example, the report message sent in step S1110 can use Msg1 or MsgA used in the RACH process.

[0180] The report message may include information for notifying the terminal 911 that a message is being sent to TRP A 901 (e.g., a terminal identifier as a transmitter address, a TRP A identifier as a destination address). In addition, the report message may include information related to a TRP selection reference of TRP B 902 requested by TRP A 901 and an identifier of TRP B 902.

[0181] In addition, if we assume that the two TRPs are based on Fig. 9 The process of establishing a backhaul link between base stations connected to the corresponding TRP by identifying each other's TRP IDs, rather than Fig.10 and Fig.11 If the base station connected to TRP A 901 transmits information requesting transmission of the measured SSB RSRP and the frequency resource usage ratio of TRP B to the base station connected to TRP B 902 by utilizing the backhaul link between the base stations. In addition, the base station connected to TRP B 902 may directly transmit information about the measured RSRP and the frequency resource usage ratio of the SSB to the base station connected to TRP A 901 through the backhaul link between the base stations in response to the received request information.

[0182] Through the above Fig.11 , TRP A 901 may obtain information about TRP B 902, as illustrated in Table 4 below.

[0183] [Table 4]

[0184] TRP(TRP ID) RSRP Value requencyResourceUtilization TRP B (TRP ID_B) RSRP_100 70％

[0185] The example format in Table 4 assumes that there is only one TRP, such as Figures 9 to 11 Therefore, in Fig. 9 In the process, if TRP A 901 receives information about two or more TRPs from terminal 911, TRP A 901 can obtain information such as Table 4 for each corresponding TRP, or obtain a table having a field for additional TRPs under a field corresponding to TRP B.

[0186] On the other hand, the above described Fig.11 The exemplary embodiments can be combined with the above Fig. 9 and Fig.10 At least one of the exemplary embodiments of and / or at least one of the exemplary embodiments to be described below may be used in combination.

[0187] Based on the above Fig. 9 Operations can be combined Fig.10 and Fig.11 The operation of the terminal 911 can select a TRP suitable for additional user data transmission. Based on the pre-configured benchmark for TRP selection, TRP A 901 as the serving TRP can obtain the information required for selecting a TRP suitable for additional user data transmission from TRP B 902. In this case, considering the MTRP NCJT environment, the terminal 911 can be configured as an intermediate repeater. Therefore, TRP A 901 can obtain the necessary information from TRP B 902 through the terminal 911.

[0188] In addition, if we assume that Fig. 9 The process of establishing a backhaul link between the base stations connected to the corresponding TRP, then Fig.10 and Fig.11 In the process, information can be requested and transmitted directly through the backhaul link between the base stations respectively connected to TRP A 901 and TRP B 902 without using the terminal 911 as an intermediate forwarder.

[0189] (2) Technique for selecting the best TRP for additional user data transmission based on received performance information

[0190] In the previous section (1), the process for configuring the basis for sending additional user data and receiving the information required for determining the appropriate TRP from TRP B 902 through Terminal 911 has been described. Fig.12 and Fig.13 Describes a process for selecting an optimal TRP for additional user data transmission based on information received about the performance of TRP B 902.

[0191] If TRP A 901 uses only SSB RSRP information for TRP selection, TRP A 901 may compare the SSB RSRP of TRP A 901 and the SSB RSRP of TRP B 902 to determine which TRP may provide better communication quality to the terminal 911 in terms of received power.

[0192] On the other hand, if the optimal TRP is determined based on how much frequency resources are used in each TRP for the common frequency band of TRP A 901 and TRP B 902, the optimal TRP can be selected by selecting a TRP with a low frequency resource usage ratio among TRP A 901 and TRP B 902, thereby selecting a TRP that can potentially provide a high transmission rate.

[0193] In addition to or in lieu of the SSB RSRP and the frequency resource usage ratio, the optimal TRP may be selected by considering the delay requirement of the terminal 911 or the mobility of the terminal 911. If the delay requirement of the terminal is considered, a TRP that supports higher performance in terms of user-experienced data rate may be selected. As another example, if the mobility of the terminal is considered, a TRP that can transmit data to the terminal 911 over a longer period of time may be selected based on the mobility or trajectory of the terminal.

[0194] Fig.12 is a signal flow diagram according to an exemplary embodiment of the present invention, in which TRP A selects the best TRP based on SSB RSRP and / or frequency resource utilization in an MTRP NCJT environment.

[0195] like Fig.12 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Figures 9 to 11 The example is performed in the same manner as described in . Therefore, Fig.12 The process also assumes the NCJT environment. In other words, Fig.12This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. Terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0196] In addition, it can be assumed that TRP A 901 has previously received the RSRP value of the SSB transmitted by TRP A 901 from the terminal 911. In addition, TRP A 901 may be in a state where it has received the RSRP value of the SSB transmitted by the terminal 911 through the above Fig.11 The process receives the information about TRP B 902. Therefore, TRP A may have the information shown in Table 5 below.

[0197] [Table 5]

[0198] TRP(TRP ID) RSRP Value requencyResourceUtilization TRP A (TRP ID_A) RSRP_69 30％ TRP B (TRP ID_B) RSRP_100 70％

[0199] In Table 5, TRP A 901 may know the RSRP value and frequencyResourceUtilization value of TRP A 901 in advance. For example, the RSRP value of TRP A 901 in Table 5 may be the RSRP value that the terminal 911 measures the SSB transmitted by TRP A 901 and reports to TRP A 901. In addition, the RSRP value and the frequencyResourceUtilization value of TRP B 902 may be obtained by Fig.11 The process obtains (or receives) the value from terminal 911.

[0200] Table 5 illustrates a case where the RSRP value of TRP B 902 is larger when comparing the RSRP of TRP A 901 measured and reported by the terminal 911 and the RSRP of TRP B 902 measured and sent to TRP A 901 by the terminal 911. In addition, according to Table 5, a case where the frequency resource utilization ratio of TRP A 901 is lower than the frequency resource utilization ratio of TRP B 902 is illustrated.

[0201] In step S1210, if TRP A 901 is determined using only SSB RSRP, TRP B 902 having a larger SSB RSRP may be selected as the best TRP. As another example, in step S1210, if TRP A 901 is determined using only frequency resource usage ratio, TRP A 901 having a lower frequency resource usage ratio may be selected.

[0202] on the other hand, Fig.12An example is shown in which TRP A901 is determined using only SSB RSRP or frequency resource usage ratio when selecting a suitable TRP for additional user data transmission, but the exemplary embodiment can be extended to a method of selecting a TRP by utilizing other determination criteria other than SSB RSRP and frequency resource usage ratio such as the delay requirement of terminal 911 or the mobility of terminal 911, or a method of selecting a TRP by comprehensively considering multiple criteria.

[0203] Fig.12 An example is shown in which the optimal TRP is selected based on only one of the SSB RSRP and the frequency resource utilization ratio, but the exemplary embodiment can also be extended to select the TRP by considering both in combination.

[0204] On the other hand, the above described Fig.12 The exemplary embodiments can be combined with the above Figures 9 to 11 At least one of the exemplary embodiments of and / or at least one of the exemplary embodiments to be described below may be used in combination.

[0205] Hereinafter, a case where TRP A 901 is selected as the best TRP and a case where TRP B 902 is selected as the best TRP will be described separately. The case where TRP A 901 or TRP B 902 is selected for additional user data transmission can be exemplified as shown in Table 6 below.

[0206] [Table 6]

[0207] TRP ID TRP ID Information TRP ID_A Select TRP A for additional user data transmission TRP ID_B Select TRP B for additional user data transmission

[0208] In step S1210, TRP A 901 may select TRP A 901 or TRP B 902 as the TRP to be responsible for additional user data transmission by comparing its own SSB RSRP and frequency resource usage ratio with the SSB RSRP and frequency resource usage ratio of TRP B 902 received from the terminal 911.

[0209] TRP A 901 may select a TRP based on the above information, and may send the TRP ID of the selected TRP to the terminal 911. Fig.13 and / or Fig.14 The transmission of the TRP ID of the selected TRP is performed in the process.

[0210] For example, if TRP A 901 is selected, TRP A 901 may transmit information indicating additional user data transmission to the terminal 911 by including TRP ID_A therein. As another example, if TRP B 902 is selected, TRP A 901 may transmit information indicating additional user data transmission to the terminal 911 by including TRP ID_B therein. As described above, the following description may be made Fig.13 and / or Fig.14 The process performs transmission of the TRP ID of the selected TRP as information indicating that additional user data is to be sent.

[0211] Therefore, the terminal 911 can determine from which TRP it will receive additional user data and how to perform resource allocation processing in the future based on the TRP ID included in the information indicating the transmission of additional user data. For example, if the TRP ID included in the information indicating the transmission of additional user data is TRP ID_A, the terminal 911 can know that it will receive additional user data from TRP A 901 in the future. On the contrary, if the TRP ID included in the information indicating the transmission of additional user data is TRP ID_B, the terminal 911 can know that it will receive additional user data from TRP B 902. Therefore, the terminal 911 can determine that the terminal will receive from TRP A 901 the information required to receive user data from both TRP A 901 and TRP B 902, that is, information about the SCS, cyclic prefix length, FFT size, etc. of the first resource used (or is currently using or has been used) by TRP A 901 for communicating with the terminal 911. This will be described below. Fig.14 Described in more detail in .

[0212] According to the present invention, information indicating additional user data transmission including a TRP ID may be sent to the terminal 911 via DCI, RRC reconfiguration, or newly defined RRC signaling for transmitting information.

[0213] On the other hand, the above described Fig.12 The exemplary embodiments can be combined with the above Figures 9 to 11 At least one of the exemplary embodiments of and / or at least one of the exemplary embodiments to be described below may be used in combination.

[0214] (3) Additional Resource Allocation Techniques for Selected TRPs

[0215] Hereinafter, the present invention will describe additional resource allocation techniques for selected TRPs.

[0216] The additional resource allocation technique for the selected TRP may include a series of processes required after determining the TRP for performing additional user data transmission until the terminal 911 receives the additional user data.

[0217] Fig.13 is a signal flow diagram according to an exemplary embodiment, for the case where TRP A is selected for additional user data transmission in an MTRP NCJT environment.

[0218] like Fig.13 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Figures 9 to 12 The example is performed in the same manner as described in . Therefore, Fig.13 The process also assumes the NCJT environment. In other words, Fig.13 This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. Terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0219] on the other hand, Fig.13 It can be shown that TRP A 901 is selected as the TRP for additional user data transmission among TRP A 901 and TRP B 902. Fig.12 In the process previously described in the previous section, TRP A901 may have been selected as the best TRP, and information about the best TRP may have been sent to the terminal 911. Therefore, the terminal 911 may Fig.12 The information of the additional user data described in the prior art knows that TRP A901 is the TRP for additional data transmission.

[0220] Since TRP A901 is a serving cell of terminal 911, there may be a communication link for communicating with terminal 911. Therefore, in step S1310, TRP A901 may allocate resources, such as an additional frequency band, to terminal 911, and transmit additional user data to terminal 911 through the additional allocated frequency band. In this case, the additional user data may be transmitted through the additional allocated PDSCH.

[0221] Fig.13The case may correspond to a case where an additional frequency band and / or time resource is allocated to the communication between TRP A 911 and the terminal 901 for sending additional user data to the terminal 911 without the intervention of another TRP other than TRP A 901 that previously communicated with the terminal 911. In this case, the additional frequency band may be allocated within a bandwidth part (BWP) pre-allocated to the terminal 911. If the frequency band of the BWP is insufficient, the BWP may be instructed to switch to allocate the additional frequency band to the terminal 911. Then, in step S1310, TRP A 901 may send additional user data to the terminal 911 by utilizing the additionally allocated resources (e.g., frequency band and / or time resources).

[0222] In the information sent by TRP A 901 to the terminal 911 in step S1310, information about the TRP ID and allocation of the additional frequency band may be sent to the terminal 911 through a newly defined DCI for transmitting information according to the present invention, RRC reconfiguration, or RRC signaling.

[0223] In step S1310, the information exemplified in Table 7 below may be delivered from TRP A 901 to Terminal 911. Fig.12 As described above, the TRP ID of TRP A901 can be sent by being included in the information indicating that the additional user data is sent as the TRP ID. Then, the allocation information of the additional frequency band for sending the additional user data can be transmitted. Finally, the additional user data can be sent through the additional frequency band based on the allocation information of the additional frequency band.

[0224] [Table 7]

[0225]

[0226] On the other hand, the above described Fig.13 The exemplary embodiments can be combined with the above Figures 9 to 12 At least one of the exemplary embodiments of and / or at least one of the exemplary embodiments to be described below may be used in combination.

[0227] Fig.14 is a signal flow diagram according to an exemplary embodiment for the case where TRP B is selected for additional user data transmission in an MTRP NCJT environment.

[0228] like Fig.14 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Figures 9 to 13 The example is performed in the same manner as described in . Therefore, Fig.14 The process also assumes the NCJT environment. In other words, Fig.14This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. The terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0229] Fig.14 It is shown that through the above Fig.12 The processing determines that TRP B 902 is suitable for the case of additional user data transmission. Therefore, the terminal 911 can receive information indicating "TRPID=TRP ID_B" from TRP A 901 through the information indicating additional user data transmission.

[0230] In step S1410, TRP A901 may be sent to the terminal 911 on the SCS, CP length, FFT size, etc. used in the communication link between TRP A901 and the terminal 911. In the present invention, the information on the SCS, CP length, FFT size, etc. may be information on the size of data to be transmitted, for example, information on a resource block (RB) and / or a physical resource block (PRB).

[0231] in other words, Fig.14 Step S1410 may be an operation after TRP B 902 is selected as the TRP to perform additional user data transmission, such as Fig.12 In this case, the terminal 911 may have received user data from TRP A 901 as a serving cell. Therefore, TRP A 901 may provide information about the existing communication link, such as information about RBs and / or PRBs, so that the terminal 911 can simultaneously receive signals from TRP A 902 and TRP B 902.

[0232] Since the terminal 911 activates only one BWP at the same time, in order to communicate with two TRPs at the same time, the size of the RB and / or PRB of the signal received from the TRP (e.g., SCS, CP length, and FFT size) may need to match. However, the current standard cannot guarantee that TRP B 902 knows the information related to the communication link used by the existing TRP A 901 in the case of MTRP NCJT. In other words, it may not be guaranteed that TRP B 902 knows the information related to the communication link between TRP A 901 and the terminal 911, that is, the information related to the RB size and / or PRB size. In the case where TRP B 902 does not know the information about the existing communication link, when TRP A 901 cannot allocate resources to the terminal 911, or when TRP B 902 can allocate better resources than TRP A 901, the SCS, cyclic prefix, FFT size, etc. of the two TRPs may not match. In this case, there may be a situation where TRP B 902 cannot allocate resources to the terminal 911.

[0233] therefore, Fig.14 The process of can be regarded as a part of the process of delivering information related to the existing communication link between TRP A 901 and terminal 911 to TRP B 902 through terminal 911 to solve the above-mentioned problem situation when TRP B 902 is selected for additional user data transmission. Fig.14 The TRP ID of information sent by TRP A901 to terminal 911 in the process, and information such as SCS, CP length and FFT size which are information related to the communication link between the existing TRP A901 and terminal 911, can be sent to terminal 911 via the newly defined DCI for transmitting information, RRC reconfiguration or RRC signaling according to the present invention.

[0234] In addition, a combination of information related to the communication link between TRP A901 (i.e., serving cell) and terminal 911 (i.e., SCS, CP, FFT size, etc.) may be predefined so that they are expressed as preconfigured indexes. When the index is predefined, TRP A901 as the serving cell may send a corresponding index value indicating information related to the communication link to terminal 911.

[0235] According to the above Fig.14 , the information sent from TRP A901 to terminal 911 can be exemplified as shown in the following Table 8.

[0236] [Table 8]

[0237]

[0238] On the other hand, the above described Fig.14 The exemplary embodiments can be combined with the above Figures 9 to 13 At least one of the exemplary embodiments of and / or at least one of the exemplary embodiments to be described below may be used in combination.

[0239] Fig.15 is a signal flow diagram according to an exemplary embodiment for a case where TRP B, which is a non-serving cell, is determined as a TRP for transmitting additional user data in an MTRP NCJT environment.

[0240] like Fig.15 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Figures 9 to 14 The example is performed in the same manner as described in . Therefore, Fig.15 The process also assumes the NCJT environment. In other words, Fig.15 This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. The terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0241] Fig.15 The operation shown in may correspond to the operation when "TRP ID = TRP ID_B" is indicated by TRP A901 through information indicating additional user data to be sent, as described above in Fig.14 In this case, Terminal 911 may confirm that it needs to receive additional user data from TRP B 902.

[0242] Based on the above confirmation, in step S1510, Terminal 911 can send the TRP ID of TRP B 902 and information related to the communication link with TRP A 901 to TRP B 902, which is the information required for Terminal 911 to receive data from TRP A 901 and TRP B 902 at the same time.

[0243] In addition, in the later described Fig.16 In the operation of the TRP B 902, the TRP B 902 can confirm that the TRP B 902 is the entity responsible for sending the additional user data based on the reception of the TRP ID of the TRP B 902. This will be described later. Fig.16 Described in more detail in .

[0244] In step S1510, the communication link related information sent by the terminal 911 to the TRP B 902 may include information such as SCS, CP length, and FFT size. In addition, when the terminal 911 and the TRP B 902 are connected to the RRC, the communication link related information including the TRP ID indicating the TRP B 902 may be sent to the TRP B 902 through the UCI, UE auxiliary information, or RRC signaling newly defined according to the present invention.

[0245] As another example, when the terminal 911 and the TRP B 902 are in the RRC invalid state, the communication link related information including the TRP ID indicating the TRP B 902 may be sent to the TRP B 902 via Msg1 or MsgA.

[0246] As another example, when the terminal 911 and TRP B 902 are in the RRC invalid state, communication link related information including a TRPID indicating TRP B 902 can be sent to TRP B 902 via the SNUE assistance information of SRB3 or the SRB3 signaling newly defined according to the present invention.

[0247] As another example, when a combination of information such as SCS, CP length, FFT size, etc. used in the communication link between the existing TRP A901 and the terminal 911 is predefined as an index, the index value defined based on SCS, CP length, FFT size, etc. can be used to transmit communication link related information.

[0248] As above Fig. 9 As described in Fig.14 and Fig.15 A backhaul link is established between the base stations connected to the two TRPs. The base station connected to TRP B 901 can directly send information about TRP ID and SCS, cyclic prefix, FFT size, etc. to the base station connected to TRP B 902 through the backhaul link between the base stations.

[0249] Based on the above description, the information sent by terminal 911 to TRP B 902 can be summarized as shown in Table 9 below.

[0250] [Table 9]

[0251]

[0252] On the other hand, the above described Fig.15 The exemplary embodiments described above may be Figures 9 to 14 At least one of the exemplary embodiments of and / or at least one of the exemplary embodiments described below may be used in combination.

[0253] Fig.16 is a signal flow diagram according to an exemplary embodiment for a case where TRP B, which is a non-serving cell, transmits additional user data in an MTRP NCJT environment.

[0254] like Fig.16 As shown, TRP A 901, TRP B 902 and terminal 911 are similar to those in the above Figures 9 to 15 The example is performed in the same manner as described in . Therefore, Fig.16 The process also assumes the NCJT environment. In other words, Fig.16 This may correspond to a situation where a link (e.g., a backhaul link) for communication between TRP A 901 and TRP B 902 is not established. The terminal 911 may be in a state where a communication link with TRP A 901 and a communication link with TRP B 902 may be established. TRP A 901 may be assumed to be a serving cell, and TRP B 902 may be assumed to be a non-serving cell.

[0255] Fig.16 The case where information indicating additional user data transmission is received from the terminal 911 is shown, as in Fig.15 Therefore, TRP B 902 can confirm that it is the TRP that needs to send additional user data to Terminal 911 based on the TRP ID included in the information indicating the additional user data transmission. In addition, TRP B 902 can obtain communication link related information related to the BWP, RB or PRB to be used based on the information indicating the additional user data transmission.

[0256] As described above, since the terminal 911 can activate only one BWP at the same time, in order to receive signals from TRP A 901 and TRP B 902 at the same time, the SCS, CP length, and FFT size of the signals received from the TRPs may need to match. In order to meet this condition, TRP B 902 may receive information required for synchronization with TRP A 901 from the terminal 911. Then, TRP B 902 may allocate time and frequency resources required for sending additional user data so that the SCS, CP length, FFT size, etc. used by TRP A 901 and TRP B 902 match based on the information required for synchronization received from the terminal 911. In other words, TRP B 902 may allocate time and frequency resources required for sending additional user data based on the information required for synchronization received from the terminal 911. Fig.15The TRP B 902 may allocate an additional frequency band for transmitting the additional user data based on the information indicating the transmission of the additional user data received in the TRP A 901. In this case, the additional frequency band may be a frequency band within the BWP allocated to the terminal 911 by the TRP A 901 as described above. In step S1610, the TRP B 902 may transmit the additional user data using the additional frequency band allocated to the terminal 911.

[0257] Here, when TRP B 902 and terminal 911 are RRC connected, according to the present invention, information about the allocated frequency band for additional user data transmission can be transmitted through SIB, DCI, RRC reconfiguration or RRC signaling newly defined as allocation information for transmitting additional frequency bands.

[0258] As another example, when TRPB 902 and terminal 911 are in the RRC invalid state, information about the allocated frequency band for additional user data transmission can be transmitted through SIB, DCI, Msg2 or MsgB. In addition, the additional user data transmitted to terminal 911 can be transmitted through PDSCH of TRPB 902.

[0259] Based on the above Fig.16 , the information and data sent by TRP B 902 to terminal 911 can be summarized as shown in the following Table 10.

[0260] [Table 10]

[0261]

[0262] On the other hand, the above described Fig.16 The exemplary embodiments described above may be Figures 9 to 15 At least one of the exemplary embodiments of the present invention is used in combination.

[0263] In the following, the above-mentioned Figures 13 to 16 process.

[0264] When TRP A901 is determined to be suitable for additional user data transmission, it can be performed Fig.13 Therefore, TRP A 901 may notify the terminal 911 of TRP ID_A as the TRP ID and transmit information about the additional resources together. When TRP B 902 is determined to be better used for additional user data transmission, it may be performed Fig.14Therefore, TRPA901 can notify Terminal 911 of TRP ID_B as TRP ID, and additionally send to Terminal 911 communication link related information required for communicating with Terminal 911, such as information about the RB or PRB currently utilized by TRPA901 (e.g., SCS, CP length, FFT size, etc.).

[0265] therefore, Fig.14 The process may be a process for resolving a desynchronization problem between TRPs that occurs when a new TRP other than TRP A 901 that is a service cell for the terminal 911 is selected for additional user data transmission in an MTRP NCJT environment.

[0266] Fig.14 and Fig.15 The process may be a process of sending communication link related information including RB or PRB related information received from TRP A901 which is a service cell of terminal 911 to TRP B 902 when a new TRP other than TRP A901 is selected for additional user data transmission in an MTRP NCJT environment. Fig.16 The process can be based on Fig.15 The communication link related information received in the communication link allocates resources for TRP B 902 to send additional user data to terminal 911, and sends the additional user data through the allocated resources.

[0267] In addition, if we assume that Fig. 9 The process of establishing a backhaul between base stations connected to the TRP, then Fig.14 and Fig.15 In the process, the request and delivery of information can be directly performed by utilizing the backhaul link between the base stations respectively connected to TRPA 901 and TRP B 902 without utilizing the terminal 911 as an intermediate forwarder.

[0268] Fig.17 is a block diagram showing the overall process for sending additional user data in an MTRP NCJT environment.

[0269] Fig.17 Assume that there is a TRP 901 which is a service cell for the terminal 911 and one or more other TRPs.

[0270] TRP A901 as a serving cell may obtain information about at least one TRP with which the terminal 911 can communicate through the terminal 911. For example, it may be assumed that TRP B and TRP C can communicate with the terminal 911. Then, TRP A901 as a serving cell may obtain TRP IDs of each of TRP B and TRP C through the terminal 911. In addition, TRP A901 may obtain information about frequency band information of each of TRP B and TRP C that has been allocated to the terminal 911 through the terminal 911. This process may correspond to Fig. 9 The case where TRP C is added in the process.

[0271] In step 1710, TRP A 901 as a serving cell may configure a reference for selecting a TRP for transmitting additional user data. Accordingly, TRP A 901 may transmit a report request message including TRP selection reference information of each of TRP B and TRP C to the terminal 911. According to the TRP selection reference information, for example, for TRP B, the RSRP measurement value of the SSB transmitted by TRP B and the usage ratio information of the common frequency band between TRP B and TRP A 901 may be requested from the terminal 911, and for TRP C, the RSRP measurement value of the SSB transmitted by TRP C and the usage ratio information of the common frequency band between TRP C and TRP A 901 may be requested from the terminal 911.

[0272] In step 1710 , TRP A 901 as a serving cell may receive a response message including requested information corresponding to TRP B and TRP C from the terminal 911 .

[0273] Then, in step 1720, the TRP A 901 as the serving cell may select a TRP to perform additional user data transmission based on the response message received in step 1710. Then, the TRP A 901 having selected the TRP to perform additional user data transmission may transmit information indicating additional user data transmission to the terminal 911.

[0274] If TRP A 901 as a serving cell is selected as a TRP for performing additional user data transmission, step S1730 may be performed. In step S1730, TRP A 901 may allocate additional resources to the terminal 911 and transmit additional user data to the terminal 911 using the additional resources.

[0275] On the other hand, the non-serving cell TRP may be selected as the TRP for transmitting the additional user data (step 1740). For example, one of TRP B or TRP C may be selected as the TRP for transmitting the additional user data to the terminal 911. Fig.17 In the example, TRP B may be selected as the TRP for sending additional user data to terminal 911.

[0276] If TRP B, which is a non-serving cell, is selected as the TRP for transmitting additional user data, the serving cell TRP A 901 may transmit information related to the communication link between TRP A 901 and the terminal 911 to TRP B through the terminal 911 (step 1741). As described above, the information related to the communication link may be information for determining an RB or PRB within a BWP. As an example of information for determining an RB or PRB within a BWP, the present invention exemplifies SCS, CP, FFT size, etc.

[0277] In step 1741, when TRP B receives information related to a communication link between TRP A 901 and terminal 911 from TRP A 901 as a serving cell of terminal 911 through terminal 911, TRP B may allocate resources for transmitting additional user data to terminal 911 based on the information related to the communication link. In this case, resources within the BWP allocated by TRP A 901 as a serving cell may be allocated to terminal 911. In addition, the resources allocated by TRP B may include time resources and / or frequency bands. In addition, TRP B may transmit additional user data using the resources allocated to terminal 911.

[0278] Fig.18 is the overall signal flow diagram for additional user data transmission in the MTRP NCJT environment.

[0279] like Fig.18 As shown, TRP A 901, TRP B 902 and terminal 911 are shown. Fig.18 The example shows the sequential execution of the above described Figures 9 to 16 The process will be Figures 9 to 16 A brief description of the process Fig.18 each step.

[0280] Step S1810a and step S1810b may correspond to Fig. 9 In addition, steps S1820a, S1820b and S1830 may correspond to steps S910a and S910b described in Fig.10 Step S1010a, step S1010b and step S1020 described in the above. Step S1840 may correspond to Fig.11 , and step S1850 may correspond to step S1110 described in Fig.12 Step S1210 described in . Step S1860 may correspond to Fig.12, and step S1860 may correspond to step S1210 described in Fig.13 Step S1310 described in .

[0281] Meanwhile, step S1870 may correspond to Fig.14 Step S1410 described in the above, step S1880 may correspond to Fig.15 , and step S1510 described in Fig.16 Step S1610 described in .

[0282] Fig.18 An exemplary embodiment connecting all the above steps is shown, and the exemplary embodiment can be achieved by only Figures 9 to 16 For example, only using Fig.17 Steps 1710, 1720, and 1730 described in the embodiment of the present invention are implemented to implement the exemplary embodiment. As another example, only Fig.17 The exemplary embodiment is implemented by steps 1710, 1720 and 1740 described in the embodiment.

[0283] It should be noted that various modifications of the implementation forms are possible, and the present invention does not impose any particular limitation on modifications utilizing combinations of the above-described exemplary embodiments.

[0284] The operation of the method according to the exemplary embodiment of the present invention can be implemented as a computer-readable program or code in a computer-readable recording medium. The computer-readable recording medium may include a recording device of all types having data that can be read by a computer system. In addition, the computer-readable recording medium can store and execute programs or codes, which can be distributed in a computer system connected via a network and read by a computer in a distributed manner.

[0285] Computer readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM or flash memory. Program instructions may include not only machine language codes created by a compiler, but also high-level language codes that can be executed by a computer using an interpreter.

[0286] Although some aspects of the present invention have been described in the context of a device, these aspects may indicate the corresponding description according to the method, and a block or device may correspond to the step of the method or the feature of the step. Similarly, the aspects described in the context of the method may be represented as the feature of a corresponding block or project or a corresponding device. Some or all steps of the method may be performed by (or using) a hardware device such as a microprocessor, a programmable computer or an electronic circuit. In some embodiments, one or more of the most important steps of the method may be performed by such a device.

[0287] In some exemplary embodiments, a programmable logic device such as a field programmable gate array can be used to perform some or all of the functions of the methods described herein. In some exemplary embodiments, the field programmable gate array can be operated with a microprocessor to perform one of the methods described herein. Typically, the method is preferably performed by a specific hardware device.

[0288] The description of the present invention is merely exemplary in nature, and therefore variant forms that do not deviate from the essence of the present invention are intended to be within the scope of the present invention. Such variant forms should not be considered as departing from the spirit and scope of the present invention. Therefore, it will be understood by those of ordinary skill in the art that various changes in form and details may be made without departing from the spirit and scope defined by the appended claims.

Claims

1. A terminal method, comprising: receiving, from a first transmission and reception point (TRP) communicating with the terminal via a first resource, a report request message including TRP selection reference information; determining whether the received TRP selection reference information includes first information to be requested from a second TRP indicated by the received TRP selection reference information; In response to determining that the first information to be requested from the second TRP is included in the received TRP selection reference information, sending a first request message requesting the first information to the second TRP; as well as When a first response message including the first information is received from the second TRP, a second response message including the first information is sent to the first TRP.

2. The method according to claim 1, further comprising: before receiving the report request message, obtaining information about the first TRP from the first TRP and obtaining information about the second TRP from the second TRP; Sending information about the first TRP to the second TRP; as well as Send information about the second TRP to the first TRP, Among them, the information about the first TRP and the information about the second TRP each include a TRP identifier (ID) and allocated frequency band information.

3. The method according to claim 2, wherein: The first information is information about utilization of specific resources of the second TRP.

4. The method according to claim 1, further comprising: In response to the TRP selection reference information including a request for a reference signal received power (RSRP) of a synchronization signal block (SSB) transmitted by the second TRP, measuring the RSRP of the SSB of the second TRP, Among them, the first response message further includes the RSRP of the SSB of the second TRP.

5. The method according to claim 1, further comprising: Receiving user data sending indication information including a TRP ID from a first TRP; receiving, in response to the TRP ID indicating the first TRP, allocation information of a second resource different from the first resource from the first TRP; as well as User data is received based on the allocation information of the second resource.

6. The method according to claim 1, further comprising: receiving, from the first TRP, user data transmission indication information including an ID of the second TRP and information related to the communication link of the first resource; Sending the ID of the second TRP and information related to the communication link with the first resource to the second TRP; receiving allocation information of the second resource from the second TRP based on the information related to the communication link of the first resource; User data is received based on the allocation information of the second resource.

7. The method according to claim 6, wherein: The allocation information of the second resource indicates resources included in the same bandwidth part (BWP) as the first resource.

8. The method according to claim 6, wherein: The information related to the communication link of the first resource includes: information related to the physical resource block (PRB) between the first TRP and the terminal.

9. A terminal comprising at least one processor, wherein: The at least one processor causes the terminal to execute: receiving, from a first transmission and reception point (TRP) communicating with the terminal via a first resource, a report request message including TRP selection reference information; determining whether the received TRP selection reference information includes first information to be requested from a second TRP indicated by the received TRP selection reference information; In response to determining that the first information to be requested from the second TRP is included in the received TRP selection reference information, sending a first request message requesting the first information to the second TRP; as well as Upon receiving a first response message including the first information from the second TRP, a second response message including the first information is sent to the first TRP.

10. The terminal according to claim 9, wherein: The at least one processor further causes the terminal to execute: before receiving the report request message, obtaining information about the first TRP from the first TRP and obtaining information about the second TRP from the second TRP; Sending information about the first TRP to the second TRP; as well as Send information about the second TRP to the first TRP, Among them, the information about the first TRP and the information about the second TRP each include a TRP identifier (ID) and allocated frequency band information. The terminal according to claim 10 , wherein: The first information is information about utilization of specific resources of the second TRP.

12. The terminal according to claim 9, wherein: The at least one processor further causes the terminal to perform: in response to the TRP selection reference information including a request for a reference signal received power (RSRP) of a synchronization signal block (SSB) transmitted by the second TRP, measuring the RSRP of the SSB of the second TRP, Among them, the first response message further includes the RSRP of the SSB of the second TRP.

13. The terminal according to claim 9, wherein: The at least one processor further causes the terminal to execute: Receiving user data sending indication information including a TRP ID from a first TRP; receiving, in response to the TRP ID indicating the first TRP, allocation information of a second resource different from the first resource from the first TRP; as well as User data is received based on the allocation information of the second resource.

14. The terminal according to claim 9, wherein: The at least one processor further causes the terminal to execute: receiving, from the first TRP, user data transmission indication information including an ID of the second TRP and information related to the communication link of the first resource; Sending the ID of the second TRP and information related to the communication link with the first resource to the second TRP; receiving allocation information of the second resource from the second TRP based on the information related to the communication link of the first resource; as well as User data is received based on the allocation information of the second resource.

15. The terminal according to claim 14, wherein: The allocation information of the second resource indicates resources included in the same bandwidth part (BWP) as the first resource.

16. The terminal according to claim 14, wherein: The information related to the communication link of the first resource includes: information related to the physical resource block (PRB) between the first TRP and the terminal.

17. A method of a first transmission and reception point (TRP), comprising: In response to requesting additional user data transmission to a first terminal communicating with a first TRP using a first resource, sending a report request message including TRP selection reference information obtained from a second TRP to the first terminal; receiving a response message from the first terminal, the response message including first information related to TRP selection reference information obtained from the second TRP; Selecting a TRP for sending user data to the first terminal based on the response message; as well as Send user data sending indication information including the identifier of the selected TRP to the first terminal.

18. The method according to claim 17, further comprising: Before sending the report request message, obtaining information about the first TRP from the first TRP and obtaining information about the second TRP from the second TRP; Sending information about the first TRP to the second TRP; as well as Send information about the second TRP to the first TRP, Among them, the information about the first TRP and the information about the second TRP each include a TRP identifier (ID) and allocated frequency band information.

19. The method according to claim 17, further comprising: In response to the selected TRP being the first TRP, allocating a second resource for sending additional user data to the first terminal; as well as Additional user data is sent to the first terminal via the second resource.

20. The method of claim 17, further comprising: generating information on utilization of the specific resource in response to receiving information requesting a specific resource of a second TRP associated with the TRP selection reference information from the second terminal; as well as The generated information regarding the utilization of the specific resource is sent to the second terminal.

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