Method and apparatus for measuring and reporting cross-link interference in next generation mobile communication systems

Abstract

A method and apparatus for measuring and reporting cross-link interference are provided. The method includes receiving a measurement configuration of a CLI from a base station (BS); performing measurement of a configured measurement object based on the measurement configuration of the CLI; and sending a measurement report of all resources among multiple resources of the CLI for measuring the configured measurement object whose measurement results exceed the threshold to the BS based on the measurement result of at least one resource among multiple resources of the CLI for measuring the configured measurement object exceeding the threshold.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for measuring and reporting cross-link interference. More specifically, the present disclosure relates to a method and apparatus for measuring and reporting cross-link interference in a next generation mobile communication system. Background Art

[0002] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop the fifth generation (5G) or pre-5G (pre-5G) communication system. Therefore, the 5G or pre-5G communication system is called a "super 4G network" communication system or a "post-long term evolution (post-LTE)" system. In order to achieve high data rates, the implementation of the 5G communication system in an ultra-high frequency or millimeter wave (mmWave) band (e.g., a 60GHz band) is being considered. In order to reduce the path loss of radio waves and increase the transmission distance of radio waves within the ultra-high frequency band of the 5G communication system, various technologies such as beamforming, massive multiple input multiple output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are being studied. In order to improve the system network of the 5G communication system, various technologies have been developed, such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), and interference elimination. In addition, for 5G communication systems, advanced coding modulation (ACM) technologies such as hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) and advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) have been developed.

[0003] The Internet has evolved from a human-centric connected network in which humans create and consume information to the Internet of Things (IoT), in which distributed elements such as objects exchange information with each other to process information. Internet of Everything (IoE) technology has emerged, in which IoT technology is combined with technology for processing big data, such as by connecting cloud servers. In order to realize IoT, various technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required. In recent years, technologies related to sensor networks for connecting objects, machine-to-machine (M2M) communication and machine type communication (MTC) have been studied. In the IoT environment, smart Internet technology (IT) services can be provided to collect and analyze data obtained from connected objects to create new value in human life. As existing information technology (IT) and various industries merge and combine with each other, IoT can be applied to various fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart homes and advanced medical services.

[0004] Various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies related to sensor networks, M2M communications, and MTC are being implemented by using 5G communication technologies including beamforming, MIMO, and array antennas. The application of cloud RAN, which is the above-mentioned big data processing technology, can be an example of the fusion of 5G communication technology and IoT technology.

[0005] Since various services can be provided according to the above and the development of mobile communication systems, a method for effectively providing these services is required. More specifically, in a service cell configured with time division duplex (TDD), in order to dynamically operate TDD resources, a method for receiving a report on interference information of a cross link from a terminal and then utilizing the report is required.

[0006] The above information is presented as background information only to assist in understanding the present disclosure. The present disclosure makes no determination or assertion as to whether any of the above is applicable to the prior art of the present disclosure. Summary of the invention

[0007] Technical Solution

[0008] Aspects of the present disclosure address at least the above-mentioned problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure provides a method and apparatus for measuring and reporting cross-link interference in a next generation mobile communication system.

[0009] Beneficial technical effects

[0010] According to one aspect of the present disclosure, a method and apparatus for measuring and reporting cross-link interference in a next generation communication system are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0012] Figure 1 is a schematic diagram showing a long term evolution (LTE) system according to an embodiment of the present disclosure;

[0013] Figure 2 is a schematic diagram showing a wireless protocol architecture in an LTE system according to an embodiment of the present disclosure;

[0014] Figure 3 is a schematic diagram showing the structure of a next generation mobile communication system according to an embodiment of the present disclosure;

[0015] Figure 4 is a schematic diagram showing a wireless protocol architecture of a next generation mobile communication system according to an embodiment of the present disclosure;

[0016] Figure 5 is a schematic diagram describing cross-link interference when a time division duplex (TDD) cell is configured in next generation mobile communications according to an embodiment of the present disclosure;

[0017] Figure 6 is a schematic diagram showing a process in which a terminal receives a measurement configuration including cross-link interference from a base station and sends a measurement report thereon in a New Radio (NR) system according to an embodiment of the present disclosure;

[0018] Figure 7 is a schematic diagram illustrating a method for measuring and reporting a cross-interference link performed by a terminal according to an embodiment of the present disclosure;

[0019] Figure 8 is a schematic diagram illustrating an operation method of a terminal when event-based measurement reporting is configured for a cross-interference link according to an embodiment of the present disclosure;

[0020] Fig. 9 is a schematic diagram illustrating a method for measuring and reporting a cross-interference link performed by a base station according to an embodiment of the present disclosure;

[0021] Fig.10 is a block diagram showing an internal structure of a terminal according to an embodiment of the present disclosure; and

[0022] Fig.11 is a block diagram showing a configuration of a base station according to an embodiment of the present disclosure.

[0023] Throughout the drawings, like reference numerals will be understood to refer to like elements, components, and structures. DETAILED DESCRIPTION

[0024] Aspects of the present disclosure address at least the above-mentioned problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method and apparatus for measuring and reporting cross-link interference in a next generation mobile communication system.

[0025] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0026] According to one aspect of the present disclosure, a method for measuring and reporting cross link interference (CLI) by a user equipment (UE) in a wireless communication system is provided. The method includes: receiving a measurement configuration of the CLI from a base station (BS); performing measurement on a configured measurement object based on the measurement configuration of the CLI; and sending a measurement report of all resources among multiple resources of the CLI for measuring the configured measurement object whose measurement result exceeds the threshold to the BS based on the measurement result of at least one resource among multiple resources of the CLI for measuring the configured measurement object exceeding the threshold.

[0027] The threshold may be a value configured for measuring the CLI and associated with at least one resource for measuring the CLI.

[0028] Performing measurement on the configured measurement object based on the measurement configuration for the CLI may include: performing measurement on the configured measurement object again based on a first measurement result of at least one of the multiple resources used to measure the CLI of the configured measurement object exceeding a threshold and a second measurement result of a measurement performed thereafter being lower than a threshold.

[0029] The first measurement result may be a value obtained by subtracting a hysteresis parameter from the measurement result, and the second measurement result may be a value obtained by adding the hysteresis parameter to the measurement result.

[0030] Performing measurement on the configured measurement object based on the measurement configuration for the CLI may include performing measurement on all resources among a plurality of resources for measuring the CLI of the configured measurement object.

[0031] The measurement configuration for the CLI may include information about at least one measurement object and information about at least one resource for measuring the CLI for each of the configured measurement objects.

[0032] The at least one resource for measuring CLI may include at least one of a sounding reference signal (SRS) resource configuration for measuring CLI or a resource configuration for measuring a received signal strength indication (RSSI).

[0033] The measurement report may include at least one of Sounding Reference Signal - Reference Signal Received Power (SRS-RSRP) or Cross Link Interference - Received Signal Strength Indication (CLI-RSSI).

[0034] The sending of the measurement report may include sending a measurement report of a serving cell of the UE to the BS.

[0035] The method may also include periodically sending measurement reports to the BS.

[0036] According to another aspect of the present disclosure, a user equipment (UE) for measuring and reporting cross-link interference (CLI) in a wireless communication system is provided. The UE includes a transceiver and at least one processor, and the at least one processor is configured to: receive a measurement configuration for CLI from a base station (BS); perform measurement on a configured measurement object based on the measurement configuration for CLI; and send a measurement report of all resources of the multiple resources for measuring the CLI of the configured measurement object whose measurement results exceed the threshold to the BS based on the measurement result of at least one resource among the multiple resources for measuring the CLI of the configured measurement object exceeding the threshold.

[0037] The threshold may be a value configured for measuring the CLI and associated with at least one resource for measuring the CLI.

[0038] The at least one processor may also be configured to: re-perform measurement of the configured measurement object based on a first measurement result of at least one of a plurality of resources for measuring the CLI of the configured measurement object exceeding a threshold and a second measurement result of a subsequently performed measurement being lower than a threshold.

[0039] The first measurement result may be a value obtained by subtracting a hysteresis parameter from the measurement result, and the second measurement result may be a value obtained by adding the hysteresis parameter to the measurement result.

[0040] The at least one processor is further configured to perform measurement on all resources of a plurality of resources for measuring the CLI of the configured measurement object.

[0041] The measurement configuration for the CLI may include information about at least one measurement object and information about at least one resource used to measure the CLI for each configured measurement object.

[0042] At least one of the plurality of resources for measuring CLI may include at least one of a sounding reference signal (SRS) resource configuration for measuring CLI or a resource configuration for measuring a received signal strength indication (RSSI).

[0043] The measurement report may include at least one of a sounding reference signal-reference signal received power (SRS-RSRP) or a cross-link interference-received signal strength indication (CLI-RSSI).

[0044] The at least one processor may be further configured to control the transceiver to send a measurement report of a serving cell of the UE to the base station.

[0045] The at least one processor may be further configured to control the transceiver to periodically send a measurement report to the BS.

[0046] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0047] Implementation

[0048] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these are to be regarded as exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and configurations may be omitted for clarity and brevity.

[0049] The terms and words used in the following description and claims are not limited to the literal meanings, but are used only by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be clear to those skilled in the art that the following description of various embodiments of the present disclosure is for illustrative purposes only and is not intended to limit the present disclosure as defined by the appended claims and their equivalents.

[0050] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0051] When describing the embodiments of the present invention, descriptions of technical contents that are well known in the technical field to which the present invention belongs and are not directly related to the present invention will be omitted. This is to convey the subject matter of the present disclosure more clearly without obscuring it by omitting unnecessary descriptions.

[0052] For the same reason, some components in the drawings may be exaggerated, omitted or schematically shown. In addition, the size of each component may not fully reflect its actual size. In the drawings, the same or corresponding elements may be given the same reference numerals.

[0053] The advantages, features and implementation methods of the present disclosure will become apparent through the embodiments of the present disclosure described in detail below in conjunction with the accompanying drawings. However, the present disclosure may be embodied in a variety of different forms and should not be construed as limited to the embodiments of the present disclosure described below; on the contrary, these embodiments of the present disclosure are provided to complete the present disclosure and fully convey the scope of the present disclosure to those of ordinary skill in the art, and the present disclosure will only be limited by the scope of the claims. Throughout the specification, the same reference numerals may represent the same elements.

[0054] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0055] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0056] In this disclosure, a controller may also be referred to as a processor.

[0057] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0058] It should be understood that each block of the process flow chart and the combination of the flow chart can be executed by computer program instructions. Since these computer program instructions may be installed on a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, the instructions executed by the processor of the computer or other programmable data processing device can generate functions described in the flowchart blocks. Since these computer program instructions can be stored in a computer-usable or computer-readable memory, these instructions can point to a computer or other programmable data processing device to perform functions in a specific manner, so the instructions stored in the computer-usable or computer-readable memory can also produce product items containing instruction means for performing the functions described in the flowchart blocks. Since computer program instructions can also be installed on a computer or other programmable data processing device, the instructions perform a series of operations on the computer or other programmable data processing device to generate a computer-implemented process to perform the computer or other programmable data processing device can also provide operations for performing the functions described in the (multiple) flowchart blocks.

[0059] In addition, each block may represent a module, segment or part of a code that includes one or more executable instructions for performing one or more specified logical functions. In addition, it should be noted that in some alternative implementation examples, the functions mentioned in the block may also appear in a different order. For example, two blocks shown in succession can actually be executed substantially simultaneously according to the corresponding functions or can sometimes be executed in the opposite order.

[0060] In addition, the term "unit" used here refers to a software component or a hardware component, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and the "unit" performs some functions. However, "~unit" is not limited to software or hardware. "~unit" can be configured to be in an addressable storage medium or can be configured to operate one or more processors. Therefore, as an example, "~unit" can include components such as software components, object-oriented software components, class components and task components, and can include processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided by components and "~units" can be associated with a smaller number of components and "~units", or can be further divided into additional components and "~units". In addition, components and "~units" can be implemented as one or more central processing units (CPUs) in an operating device or a secure multimedia card. In addition, in an embodiment, "~unit" can include one or more processors.

[0061] In the following description, for the convenience of description, terms used to identify access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are used. Therefore, the present disclosure is not limited to the terms used below and other terms referring to objects with equivalent technical meanings may be used.

[0062] In the following description, for convenience of description, terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) and New Radio (NR) standards or modified terms and names based thereon may be used. However, the present disclosure is not limited to these terms and names, and is also applicable to systems according to other standards.

[0063] That is, when describing the embodiments of the present invention in detail, the communication standards defined in 3GPP will be mainly targeted; however, the subject matter of the present disclosure may also be applied to other communication systems with similar technical backgrounds with some modifications without substantially departing from the scope of the present disclosure, which can be achieved through the judgment of ordinary technicians in the technical field of the present disclosure.

[0064] The present disclosure relates to a method for receiving a report on interference information of a cross link from a terminal so as to dynamically operate TDD resources in a serving cell configured with time division duplex (TDD). To this end, a series of operations may be required for the terminal to measure and report uplink interference information sent by another terminal in a surrounding cell (or cross link). The interference information may include SRS-RSRP and CLI-RSSI. The measurement and reporting of reference signals in the NR system may be performed based on a downlink reference signal, which may be a signal sent by a base station. However, a new process may be required for the terminal to measure and report a signal sent by another terminal.

[0065] According to the embodiment of the present disclosure, by providing a process of measuring an uplink signal (such as SRS-RSRP and CLI-RSSI) sent by another terminal in a next generation mobile communication system and reporting the corresponding measurement value to the base station, the base station can configure dynamic TDD according to the reported measurement value. For example, when the interference of the surrounding cells is strong, the base station can limit the allocation of TDD uplink to the terminal, thereby improving data quality.

[0066] Figure 1 is a schematic diagram showing the structure of an LTE system according to an embodiment of the present disclosure.

[0067] refer to Figure 1 As shown in the figure, the radio access network of the LTE system may include multiple base stations (e.g., evolved Node Bs (eNBs), Node Bs, or base stations) 1a-05, 1a-10, 1a-15, and 1a-20, a mobility management entity (MME) 1a-25, and a serving gateway (S-GW) 1a-30. User terminals (e.g., user equipment (UE) or terminals) 1a-35 may access external networks through the eNBs 1a-05, 1a-10, 1a-15, and 1a-20 and the S-GW 1a-30.

[0068] Base stations (e.g., evolved Node B (eNB), Node B, or base station) 1a-05, 1a-10, 1a-15, and 1a-20 may serve as access nodes of a cellular network to provide wireless access to a terminal accessing the network. That is, in order to serve the user's business, the base stations 1a-05, 1a-10, 1a-15, and 1a-20 may support the connection between the terminal and the core network (CN) by collecting and scheduling status information such as the buffer status, available transmission power status, and / or channel status of the terminal.

[0069] In addition, base stations 1a-05, 1a-10, 1a-15 and 1a-20 may correspond to existing node Bs of the Universal Mobile Telecommunications System (UMTS). The eNB 1a-05 may be connected to the UE 1a-35 via a wireless channel and may perform more complex functions than the existing node Bs. In the LTE system, since all user services (including real-time services such as voice over IP (VoIP) over the Internet Protocol) are provided through shared channels, a device for collecting and scheduling status information such as the buffer status of the UE, the available transmission power status or the channel status may be required, which may be managed by the eNBs 1a-05, 1a-10, 1a-15 and 1a-20. One eNB may generally control multiple cells. The LTE system may use orthogonal frequency division multiplexing (OFDM) as a radio access technology. In addition, an adaptive modulation and coding (AMC) scheme may be applied to determine the modulation scheme and the channel coding rate according to the channel status of the terminal.

[0070] MME 1a-25 may be a device for managing various control functions and a mobility management function of a terminal, and it may be connected to a plurality of base stations. S-GW 1a-30 may be a device for providing data bearers. MME 1a-25 and S-GW 1a-30 may perform authentication, bearer management, etc. for a terminal accessing a network, and may process packets received from base stations 1a-05, 1a-10, 1a-15, and 1a-20 or packets to be sent to base stations 1a-05, 1a-10, 1a-15, and 1a-20.

[0071] Figure 2 FIG. 4 is a schematic diagram showing a radio protocol architecture in an LTE system according to an embodiment of the present disclosure.

[0072] refer to Figure 2 , the radio protocols of the LTE system may include Packet Data Convergence Protocol (PDCP) 1b-05 and 1b-40, Radio Link Control (RLC) 1b-10 and 1b-35, and Medium Access Control (MAC) 1b-15 and 1b-30 in the terminal and eNB, respectively. PDCP 1b-05 and 1b-40 may manage operations such as IP header compression / decompression. The main functions of PDCP can be summarized as follows.

[0073] -Header compression and decompression function (Header compression and decompression: ROHC only)

[0074] -User data transmission function (transmission of user data)

[0075] - In-sequence delivery function (in-sequence delivery of upper layer PDUs during PDCP re-establishment of RLC AM)

[0076] - Reordering functionality (for split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0077] -Duplicate detection function (duplicate detection of lower layer SDU during PDCP reestablishment of RLC AM)

[0078] - Retransmission functionality (retransmission of PDCP SDUs at handover and, for split bearers in DC, retransmission of PDCP PDUs during PDCP data recovery in RLC AM)

[0079] -Encryption and decryption functions (encryption and decryption)

[0080] -Timer-based SDU discard function (timer-based SDU discard in uplink)

[0081] Radio Link Control (RLC) 1b-10 and 1b-35 may reconfigure a PDCP Packet Data Unit (PDU) with an appropriate size to perform an ARQ operation, etc. The main functions of the RLC may be summarized as follows.

[0082] -Data transmission function (transmission of upper layer PDU)

[0083] -ARQ function (error correction through ARQ (only for AM data transmission))

[0084] - Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU (applicable only to UM and AM data transmission))

[0085] - Re-segmentation function (resegmentation of RLC data PDU (only for AM data transmission))

[0086] - Reordering function (reordering of RLC data PDUs (only for UM and AM data transmission))

[0087] - Duplicate detection function (Duplicate detection (only for UM and AM data transmission))

[0088] - Error detection function (protocol error detection (for AM data transmission only))

[0089] -RLC SDU discard function (RLC SDU discard (only for UM and AM data transmission))

[0090] -RLC reestablishment function (RLC reestablishment)

[0091] MAC 1b-15 and 1b-30 may be connected to a plurality of RLC layers configured in one terminal and may perform operations of multiplexing RLC PDUs to MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC may be summarized as follows.

[0092] - Mapping function (mapping between logical channels and transport channels)

[0093] - Multiplexing and demultiplexing functions (MAC SDUs belonging to one or different logical channels are multiplexed / demultiplexed to / from a transport block (TB) which is delivered to / from the physical layer on a transport channel)

[0094] -Scheduling information reporting function (Scheduling information reporting)

[0095] -HARQ function (error correction through HARQ)

[0096] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0097] - Priority handling between terminals (using dynamic scheduling to handle the priority between UEs)

[0098] -MBMS service identification function (MBMS service identification)

[0099] -Transmission format selection function (transmission format selection)

[0100] -Filling function (fill)

[0101] The physical layers 1b-20 and 1b-25 may channel-code and modulate upper layer data, generate OFDM symbols, and transmit them over a wireless channel, or may demodulate and channel-decode OFDM symbols received over a wireless channel and transmit the results thereof to an upper layer.

[0102] Although Figure 2 Although not shown, a radio resource control (RRC) layer may exist above the PDCP layer of the terminal and the base station, and the RRC layer may transmit / receive a connection and measurement-related configuration control message for radio resource control.

[0103] Figure 3 is a schematic diagram showing a structure of a next-generation mobile communication system according to an embodiment.

[0104] refer to Figure 3, the wireless access network of the next generation mobile communication system (5G or NR system) may include a next generation base station (e.g., a new radio node B (NR NB), NR gNB or NR base station) 1c-10 and a new radio core network (NR CN) (or next generation core network (NG CN)) 1c-05. A user terminal (e.g., a new radio user equipment (NR UE) or terminal) 1c-15 may access an external network through the NRgNB 1c-10 and the NR CN 1c-05.

[0105] Reference Figure 3 , NR gNB 1c-10 may correspond to an evolved Node B (eNB) of an LTE system. NR gNB 1c-10 may be connected to NR UE 1c-15 via a wireless channel and may provide better services than an existing Node B. In the next generation mobile communication system, because all user services are provided through a shared channel, a device for collecting and scheduling status information such as a buffer status of a UE, an available transmission power status, or a channel status may be required, which may be managed by the NR gNB 1c-10. One NR gNB 1c-10 may generally control multiple cells and may include a central unit (CU) that generally manages control and signaling and a distributed unit (DU) that manages signal transmission / reception. In order to achieve ultra-high-speed data transmission compared to LTE, the next generation mobile communication system (5G or NR system) may have a maximum bandwidth higher than the existing maximum bandwidth and may additionally apply beamforming technology by using orthogonal frequency division multiplexing (OFDM) technology as a wireless access technology. In addition, an adaptive modulation and coding (AMC) scheme may be applied to determine the modulation scheme and channel coding rate according to the channel status of the terminal. NR CN1c-05 can perform functions such as mobility support, bearer configuration, and quality of service (QoS) configuration. NR CN 1c-05 can be a device for managing various control functions and mobility management functions of the terminal, and can be connected to multiple base stations. In addition, the next generation mobile communication system (5G or NR system) can also be linked to the LTE system, and NR CN 1c-05 can be connected to MME1c-25 through a network interface. MME 1c-25 can be connected to eNB 1c-30, which is an existing base station.

[0106] Figure 4 is a schematic diagram showing a wireless protocol architecture of a next generation mobile communication system according to an embodiment of the present disclosure.

[0107] refer to Figure 4, the radio protocol of the next generation mobile communication system (5G or NR system) may include NR Service Data Adaptation Protocol (SDAP) 1d-01 and 1d-45, NR PDCP 1d-05 and 1d-40, NR RLC1d-10 and 1d-35, and NR MAC 1d-15 and 1d-30 in the terminal and NR base station respectively.

[0108] The main functions of NR SDAP 1d-01 and 1d-45 may include some of the following.

[0109] -User data transmission function (transmission of user plane data)

[0110] - Mapping function between QoS flows and data bearers for uplink and downlink (mapping between QoS flows and DRBs for both downlink and uplink)

[0111] - Function to mark QoS flow ID for uplink and downlink (mark QoS flow ID in both DL and UL packets)

[0112] - Functionality to map Reflective QoS flows to data bearers of uplink SDAP PDUs (Reflective QoS flows to DRB mapping for UL SDAP PDUs)

[0113] For the SDAP layer, the terminal can be configured whether to use the header of the SDAP layer for each PDCP layer, each bearer or each logical channel, or whether to use the RRC message of the SDAP layer function. When configuring the SDAP header, the non-access layer (NAS) QoS reflection configuration 1-bit indicator (NAS reflection QoS) and the access layer (AS) QoS reflection configuration 1-bit indicator (AS reflection QoS) of the SDAP header can be used to indicate that the terminal is allowed to update or reconfigure the QoS flow of the uplink and downlink and the mapping information about the data bearer. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority and scheduling information, etc. to support smooth services.

[0114] The main functions of NR PDCP 1d-05 and 1d-40 may include some of the following functions.

[0115] -Header compression and decompression function (Header compression and decompression: ROHC only)

[0116] -User data transmission function (user data transmission)

[0117] - Sequence delivery function (sequence delivery of upper layer PDUs)

[0118] - Out-of-order delivery function (out-of-order delivery of upper layer PDUs)

[0119] - Reordering function (PDCP PDU reordering for reception)

[0120] - Duplicate detection function (duplicate detection of lower layer SDU)

[0121] -Retransmission function (retransmission of PDCP SDU)

[0122] -Encryption and decryption functions (encryption and decryption)

[0123] - Timer-based SDU discard functionality (Timer-based SDU discard in uplink)

[0124] Here, the reordering function of the NR PDCP entity may refer to a function of reordering the PDCP PDU received from the lower layer based on the PDCP sequence number (SN), which may include the function of sending data to the upper layer according to the reordered sequence or immediately sending data to the upper layer without considering the sequence, the function of reordering the sequence and recording the lost PDCP PDU, the function of reporting the status of the lost PDCP PDU to the transmitting side, and the function of requesting retransmission of the lost PDCP PDU.

[0125] The main functions of NR RLC 1d-10 and 1d-35 may include some of the following functions.

[0126] -Data transmission function (transmission of upper layer PDU)

[0127] - Sequence delivery function (sequence delivery of upper layer PDUs)

[0128] - Out-of-order delivery function (out-of-order delivery of upper layer PDUs)

[0129] -ARQ function (error correction through ARQ)

[0130] - Concatenation, segmentation and reassembly function (concatenation, segmentation and reassembly of RLC SDU)

[0131] - Re-segmentation function (resegmentation of RLC data PDU)

[0132] - Reordering function (reordering of RLC data PDU)

[0133] -Duplicate detection function (duplicate detection)

[0134] -Error detection function (protocol error detection)

[0135] -RLC SDU discard function (RLC SDU discard)

[0136] -RLC reestablishment function (RLC reestablishment)

[0137] Here, the sequential transmission (sequential delivery) function of the NR RLC entity may refer to a function of sequentially sending the RLC SDU received from the lower layer to the upper layer. More specifically, when one original RLC SDU is divided into a plurality of RLC SDUs and received, the above functions may include a function of reassembling and sending the received RLC SDU, a function of reordering the received RLC PDU based on the RLC sequence number (SN) or the PDCP sequence number (SN), a function of reordering the sequence and recording the lost RLC PDU, a function of reporting the status of the lost RLC PDU to the transmitting side, a function of requesting retransmission of the lost RLC PDU, a function of sequentially sending only the RLC SDU before the lost RLC SDU to the upper layer when there is a lost RLC SDU, a function of sequentially sending all RLC SDUs received before the timer is started to the upper layer when a specific timer has expired even when there is a lost RLC SDU, and a function of sequentially sending all RLC SDUs received so far to the upper layer when a specific timer expires even when there is a lost RLC SDU.

[0138] In this case, the RLC PDUs may be processed in the order of reception (in the order of arrival, regardless of the order of sequence numbers) and then sent to the PDCP entity regardless of the order (out-of-order delivery), and in the case of segmentation, segments stored in a buffer or received later may be received, reconfigured into one complete RLC PDU and then processed and sent to the PDCP entity. The NR RLC layer may not include a cascading function, which may be performed in the NR MAC layer or may be replaced by a multiplexing function of the NR MAC layer.

[0139] Here, the non-sequential transmission function (out-of-order delivery) of the NR RLC entity may refer to a function of immediately sending the RLC SDU received from the lower layer to the upper layer regardless of the sequence, and may include the following functions: when an original RLC SDU is split into multiple RLC SDUs and received, reassembling and sending the RLC SDU, and may include the functions of storing the RLC SN or PDCP SN of the received RLC PDU, sorting the sequence, and recording the lost RLC PDU.

[0140] NR MAC 1d-15 and 1d-30 can be connected to multiple NR RLC layers configured in one terminal, and the main functions of NR MAC may include some of the following functions.

[0141] - Mapping function (mapping between logical channels and transport channels)

[0142] -Multiplexing and demultiplexing functions (MAC SDU multiplexing / demultiplexing)

[0143] -Scheduling information reporting function (Scheduling information reporting)

[0144] -HARQ function (error correction through HARQ)

[0145] - Priority handling between logical channels (priority handling between logical channels of a UE)

[0146] - Priority processing function between terminals (processing the priority between UEs through dynamic scheduling)

[0147] -MBMS service identification function (MBMS service identification)

[0148] -Transmission format selection function (transmission format selection)

[0149] -Filling function (fill)

[0150] NR PHY layers 1d-20 and 1d-25 can channel encode and modulate upper layer data, generate OFDM symbols and send them on the wireless channel, or can demodulate and channel decode OFDM symbols received on the wireless channel and send the results to the upper layer.

[0151] Figure 5 It is a schematic diagram for describing cross-link interference when a TDD cell is configured in a next generation mobile communication system according to an embodiment of the present disclosure.

[0152] refer to Figure 5 , shows the impact of cross-link interference (CLI) in operating dynamic TDD scheduling / configuration in the entire disclosed LTE and NR system. The present disclosure can be applied to such scenarios. In addition, from the perspective of the base station, remote interference management (RIM) for the terminal can be performed by receiving and applying the measurement value of the cross-link interference. For example, this can be achieved by applying dynamic TDD scheduling.

[0153] refer to Figure 5 , there may be a mobile communication network including TDD cells around it. Figure 5As shown, when gNB1 (or base station 1) 1e-05 supports TDD in the service cell to which terminal 1 1e-15 is connected, gNB 2 (or base station 2) 1e-10 may also support TDD in surrounding cells. In this case, there may be a terminal 2 1e-20 connected to gNB 2 1e-10 to receive services. In addition, data transmission and downlink reference signal 1e-25 sent from base station 1 1e-05 to terminal 1 1e-15 may be measured as uplink interference 1e-35 for base station 2 1e-10. In addition, data transmission or uplink sounding reference signal (SRS) transmission 1e-30 from terminal 2 1e-20 to base station 2 1e-10, which is the service cell of terminal 2 1e-20, may be received as cross-link interference 1e-40 by a terminal (such as terminal 11e-15) receiving services from another service cell (base station 1 1e-05). Here, SRS received signal received power (SRS-RSRP) (RSRP value of SRS resources measured by a terminal belonging to the current serving cell for SRS resources sent by terminals belonging to surrounding cells), CLI received signal strength index (CLI-RSSI) (signal strength measured by a terminal belonging to the current serving cell for all signals sent by terminals belonging to surrounding cells), etc. can be used as measurement values ​​of cross-link interference. According to one embodiment of the present disclosure, cross-link interference information 1e-40 between terminals can be considered when measuring cross-link interference.

[0154] The method of configuring uplink and downlink symbols in the NR TDD system may be different from that in the LTE system, which is summarized as follows.

[0155] 1) Cell-specific configuration: flexible symbol allocation for uplink or downlink via system information or common RRC signaling

[0156] 2) UE-specific configuration: resources allocated as flexible symbols are allocated as uplink symbols or downlink symbols via dedicated RRC messages

[0157] 3) Configuration through group common indication: Change the flexible symbol through the group common PDCCH (i.e., the slot format indicator (SFI))

[0158] 4) UE-specific indication: Change the flexible symbol through the UE-specific PDCCH (i.e., downlink control indicator (DCI))

[0159] That is, in the NR TDD system, symbols for basic uplink transmission / flexible transmission / downlink transmission supported by the cell may be allocated for each specific time slot, and symbols allocated for flexible transmission of each terminal may be changed to another transmission mode. In this case, the symbol for flexible transmission may represent a flexible symbol that can be configured by the base station as a symbol for uplink and downlink transmission. When the corresponding flexible symbol is not changed for another transmission, both uplink transmission and downlink transmission may not occur in the corresponding symbol.

[0160] refer to Figure 5 , TDD mode 1 (1e-45, 1e-50, 1e-55) can be configured in the cell supported by base station 1 1e-05. That is, 6 symbols 1e-45 for downlink transmission, 3 symbols 1e-50 for flexible transmission, and 5 symbols 1e-55 for uplink transmission can be sequentially configured in a time slot including a total of 14 symbols. In addition, TDD mode 2 (1e-65, 1e-70, 1e-75) can be configured in the cell supported by base station 2 1e-10. That is, 2 symbols 1e-65 for downlink transmission, 1 symbol 1e-70 for flexible transmission, and 11 symbols 1e-75 for uplink transmission can be sequentially configured in a time slot including a total of 14 symbols. In this case, the terminal 11e-15 and the terminal 2 1e-20 belonging to the base station 1 1e-05 and the base station 2 1e-10, respectively, can perform data transmission / reception and reference signal transmission / reception according to the TDD resource information configured in their respective service cells. The specific downlink part 1e-60 configured in the terminal 1 1e-15 may overlap with the specific uplink part 1e-80 of the surrounding cell, and the terminal 1 1e-15 located at the edge of the cell may be affected by the interference in the surrounding cells. That is, cross-link interference may be received from the terminal 2 1e-20 in the downlink part 1e-60, which may result in a decrease in communication performance. More specifically, the interference signal may affect the downlink signal originally to be received, thereby increasing the probability of reception and decoding failure, thereby reducing the data transmission / reception rate.

[0161] In relation to the above problem, when the terminal measures SRS-RSRP and CLI-RSSI for the part (1e-60, 1e-80) during which the base station instructs the terminal to measure the cross-link interference and reports the measured value to the base station, the base station can determine the cross-link interference degree of the terminal in the corresponding part. Based on this, the base station can adjust the scheduling of resource allocation and can adjust the uplink and downlink transmission time slots and symbols of the terminal through dynamic TDD configuration.

[0162] refer to Figure 5The entire scenario described is not limited to the scenario between TDD cells, but can also be applied to a situation where TDD cells and FDD cells are mixed or to a mobile communication network that only includes FDD cells.

[0163] Figure 6 The present invention is a schematic diagram showing a process in which a terminal receives a measurement configuration including cross-link interference from a base station and sends a measurement report thereon in an NR system according to an embodiment of the present disclosure.

[0164] The terminal 1 1f-01 in the idle mode RRC_IDLE can find a suitable cell in the cell (re) selection operation and reside on the corresponding base station 1f-02 (1f-05) and can perform an RRC connection with the base station 1f-02 due to the presence of data to be sent, etc. (1f-10). The idle mode may be a state in which data cannot be sent because the terminal is not connected to the network for power saving, etc., and it may be necessary to switch to the connected mode RRC_CONNECTED for data transmission. In addition, the residence may mean that the terminal stays in the corresponding cell and receives a paging message to determine whether data is received in the downlink. When the RRC connection process between the terminal 1 1f-01 and the base station 1f-02 is successful, the terminal 1 1f-01 can switch to the connected mode RRC_CONNECTED and the terminal 1 1f-01 in the RRC connected mode can send data to / receive data from the base station 1f-02.

[0165] When a terminal in the connected mode RRC_CONNECTED moves into or out of a cell from another cell / base station, it can be instructed to send / receive data through the newly connected cell / base station after switching from another cell / base station. To this end, the base station can provide a configuration indicating a measurement (L3 measurement: downlink reference signal, such as CSI-RS or SSB) for another frequency / cell through an RRC message (1f-15). The measurement indication may include the object, conditions, parameters, etc. of the terminal reporting the measurement result to the base station. In addition, the embodiment of the present disclosure is characterized in that: configuration and execution Figure 5The operations of measuring and reporting the cross-link interference described in and performing the reporting by measuring the existing downlink reference signal. In operation 1f-15, the base station may provide measurement configuration information (measConfig) to the terminal, which configuration information may include CLI measurement and reporting related configuration information in addition to the existing downlink reference signal measurement configuration and reporting. In addition, the measurement configuration information (measConfig) may include a measurement object configuration (measObject), a report configuration (reportConfig), a measurement identifier configuration (measID) in which the measurement object and the reporting method are associated, a configuration indicating the type of value to be measured (quantityConfig), and the like.

[0166] For reference the measConfig signaling is written in the following ASN.1.

[0167]

[0168] In the following, the configuration information about cross-link interference will be described in more detail. See ASN.1 related to MO below.

[0169]

[0170] 1. Measurement object configuration

[0171] First, for measurement object (MO) configuration, there may be a method of reusing measObjectNR used for measurement configuration in the current NR (first MO configuration method) and a method of using a new measObject (e.g., measObject-CLI) for CLI measurement (second MO configuration method).

[0172] In the first MO configuration method, resource configuration information for measuring an existing downlink reference signal (CSI-RS or SSB) may be provided. For example, there may be frequency information for measurement, subcarrier spacing (SCS) information, SS / PBCH block measurement timing configuration (SMTC) configuration, configuration information for beam measurement, reference signal type information, black cell / white cell list, etc. When the above measObjectNR is used as is in the CLI measurement configuration, two conditions may be required.

[0173] - Among the existing configuration information (parameters) contained in measObjectNR, the configuration information not required for CLI specific (measurement) configuration can be omitted (because all field (parameter) configurations contained in measObjectNR are optional, in the case of CLI measurement configuration, they can be omitted by adding conditions)

[0174] - Field (parameter) configuration for CLI measurement can be added to measObjectNR. From ASN.1 point of view, new parameters can be added to the existing configuration as an extension. The new configuration information can include SRS resource configuration, etc.

[0175] Furthermore, the CLI measurement may be a measurement in the downlink resources of the serving cell, which may mean measuring interference that conflicts with the downlink resources of the serving cell. To this end, resources in a specific time-frequency domain in the activated downlink bandwidth part (BWP) should be allocated for the CLI measurement. In other words, this may mean that only SCS resources such as an activated downlink BWP can be measured. As a configuration condition for this, the condition that the measObjectNR in which the CLI measurement is configured should always be associated with the serving cell may be required. See the field description below.

[0176] servingCellMO

[0177] The measObjectId of the MeasObjectNR in MeasConfig is associated with the serving cell. For this MeasObjectNR, the following relationship applies between this MeasObjectNR and the frequencyInfoDL of the ServingCellConfigCommon of the serving cell: if ssbFrequecny is configured, its value is the same as absoluteFrequencySSB, if csi-rs-ResourceConfigMobility is configured, its subcarrierSpacing value is in an entry in scs-SpecificCarrierList, csi-RS-CellListMobility includes an entry corresponding to the serving cell (whose cellId is equal to physCellId in ServingCellConfigCommon) and the frequency range indicated by the csi-rs-MeasurementBW of the entry in csi-RS-CellListMobility is included in the frequency range indicated by the entry in scs-SpecificCarrierList.

[0178] In the second MO configuration method, a new MO that is used only for CLI measurement can be used, or a new MO that can generally be used to measure signals other than downlink reference signals can be used. Examples of measuring other signals may include uplink delay measurements, etc. That is, the newly used measObject can be defined to also include other types of MOs or perform reports that are different from existing ones. A new type of report may be a report for sending log data. In addition, when a new MO is used by applying the second MO configuration method, information about which service cell the corresponding MO is associated with may be required. That is, additional information about which cell the configured MO is synchronized with may be required. This may be because it is necessary to configure how to define the reference SFN of the MO to be measured and how to configure synchronization with other measurement frequencies. To this end, the following method can be used.

[0179] - Second MO configuration method -1: A condition may be added so that for a newly used MO, it is also always associated with the serving cell to which the corresponding configuration is applied (i.e., for a new MO, fields such as frequency and SCS may be set to also be associated with the serving cell, and a condition may be set so that the corresponding MO is associated with servicesCellMO)

[0180] - Second MO configuration method-2: The serving cell information (cell index or all cells with the same frequency synchronization) to which the corresponding MO is applied can be added in the newly used MO configuration. That is, when the corresponding CLI measurement configuration is included, the MO can be configured for each serving cell.

[0181] Furthermore, as an additional consideration related to measurement object configuration, there may be how to add parameters for CLI measurement related configuration. The present disclosure describes a method of adding CLI measurement parameters by the following two methods.

[0182] -First CLI measurement parameter configuration method: The resource configuration information (e.g., SRS resource) measured by the CLI can be directly added to the MO. This can be a method of explicitly indicating the additional information required for the SRS resource configuration by extending the corresponding information element (IE) when using the existing measObjectNR. The SRS resource configuration may include the number of ports for sending SRS, frequency domain resource information and frequency hopping, the transmission method of SRS resources (periodic, semi-periodic, or non-periodic), etc. This may include information on how to send the SRS resource to be measured on which time-frequency resource.

[0183] -Second CLI measurement parameter configuration method: A method for indicating configuration information (e.g., SRS resources) for CLI measurement configured in the MO with reference to the existing SRS configuration (SRS-Config). That is, the configuration information (e.g., SRS resources) for CLI measurement may be indicated by index information (SRS-ResourceId) about the SRS resource (SRS-Resource) or by index information (SRS-ResourceSetId) about the SRS-ResourceSet configured with the SRS resource set. To this end, when the base station provides the SRS-Config in the RRCReconfiguration, the SRS-ResourceSet configuration including the SRS-Resource configuration or the SRS-Resource configured for CLI measurement may include information indicating that a specific SRS resource (or a corresponding SRS resource included in the corresponding SRS resource set) is not a configuration for SRS transmission but a resource configuration for SRS measurement (CLI measurement). This information may be indicated by a 1-bit indicator (CLI measurement indicator). When the indicator is absent, it may be determined as configuration information for SRS transmission.

[0184] In the above two methods of adding CLI measurement parameters, multiple pieces of SRS resource configuration information may be included in one MO, or multiple pieces of SRS resource configuration information may be included and configured in one or more SRS resource set information.

[0185] 2. Measurement report configuration

[0186] In the above-mentioned measurement object configuration operation, when an MO for CLI measurement is configured, the terminal can measure the resources configured in the corresponding MO. In this case, it may be necessary to determine how to report the measurement results of the corresponding MO to the base station, and its reporting conditions and methods may be included in the measurement report configuration. In addition, the measurement report configuration may be configured in association with a specific MO (MO configured with CLI measurement). In the following, a measurement reporting method according to an embodiment of the present disclosure will be described.

[0187] A. Periodic Report Configuration

[0188] ◆New reference signal types for CLI measurement in PeriodicalReportConfig can be defined. That is, the existing IE can be extended to use rsType-v16xy for SRS-RSRSP and CLI-RSSI, and its period, number of reports within the period, etc. can be included. In the existing IE fields, reusable fields can be reused, and only fields that require new configuration (e.g., rsType-v16xy) can be added. See the existing ASN.1 structure below.

[0189]

[0190] B. Event-based reporting configuration: Both of the following methods are available

[0191] ◆First event-based reporting method: CLI measurement reporting using new event-based reporting

[0192] ● New event (S1): When the SRS-RSRP in the measurements associated with the MO exceeds the configured threshold:

[0193] The new event (S1) can have the same process as the existing A1 event; however, because the type of reference signal to be measured may be different, a dedicated event can be used for it. Please refer to the existing A1 event below. That is, the new event (eventS1) can have the same parameters as the A1 event; however, the type and range of the threshold of the reference signal applied to the a1-Threshold can vary. That is, the existing MeasTriggerQuantity can be redefined and reused, or a new MeasTriggerQuantity can be defined and used only for CLI measurements. This may be because the range of RSRP thresholds applied to the existing downlink CSI-RS and SSB and the range of RSRP thresholds applied to the uplink SRS may be different. In addition, new mapping tables and indexes for SRS-RSRP measurement and threshold mapping can be used.

[0194]

[0195] In addition, for a new event (S1), when multiple SRS resources are configured, the following event-based SRS resource measurement reporting method can be considered according to the number and method of event reporting.

[0196] i) The first method of reporting multiple SRSs: a reporting method based on the measurement value of each configured SRS resource:

[0197] When at least one SRS resource configured in the MO exceeds a threshold and triggers a measurement report, the measurement values ​​of all SRS resources included in the MO may be included and reported, or only the measurement values ​​of the SRS resources that trigger the corresponding event may be included and reported.

[0198] ii) Second method for reporting multiple SRSs: reporting method based on the average value of all configured SRS resources:

[0199] When the average value of the measurement values ​​of the SRS resources configured in the MO exceeds a threshold and triggers a measurement report, the measurement values ​​of all SRS resources included in the MO may be included and reported, or only the measurement values ​​of the SRS resources that triggered the corresponding event may be included and reported.

[0200] In addition, a 1-bit indicator for selecting the first method of reporting a plurality of SRSs and the second method of reporting a plurality of SRSs may also be used.

[0201] ● New event (S2): When the SRS-RSRP in the measurements associated with the MO is less than the configured threshold:

[0202] Like the new event (S1) described above, in the case of the new event (S2), a new event (S2) can be generated (see the existing A2 event process), and the content described in the new event (S1) can be applied as is. However, according to an embodiment of the present disclosure, the new event (S2) may not be used and a reportOnLeave function may be added to the above-mentioned new event (S1). In this case, when the conditions of the new event (S1) are met and the conditions of the new event (S1) are not met thereafter, the new event (S2) can be replaced by re-executing the report on the new event (S1). This may be because when the measured SRS-RSRP value is less than a certain threshold, from the perspective of the base station, the measurement value of the terminal reporting this may not be very important information. In addition, when the new event (S2) is used, the load on the terminal may increase due to frequent measurement reports.

[0203] ◆ Second event-based reporting method: Extend the existing event-based reporting process to apply to CLI measurement reports

[0204] ● Reuse of existing event (A1): When the process applied to the existing event (A1) can be applied as is to the CLI measurement report, reusing the existing A1 event process may be advantageous in terms of signal processing. As shown in the ASN.1 example of the A1 event above, the existing parameters can be applied as is to the CLI measurement and event reporting. To this end, it may be necessary to determine whether SRS-RSRP is applicable to triggerQuantity (MeasTriggerQuantity). When the existing parameters are applicable to CLI measurement and event reporting, when configuring the CLI measurement value, the RSRP mapping value in MeasTriggerQuantity should be applicable to SRS-RSRP. As described above, since the range of parameters configured based on the downlink reference signal and the range of parameters configured based on the uplink SRS signal may be different, when the corresponding ranges are different, the first event-based reporting method can be applied.

[0205] ●The event A2 reuse issue can be considered in CLI measurement and event reporting. In this case, the above-mentioned event A1 reuse method can be applied even when it is below the threshold. However, as described above, event A2 may not be used and the reportOnLeave function may be added to the above-mentioned A1 event. In this case, when the conditions of event A1 are met and the conditions of event A1 are not met afterwards, event A2 can be replaced by re-executing the report of the A1 event. This may be because when the measured SRS-RSRP value is less than a certain threshold, the measurement value of the terminal reporting this may not be very important information from the perspective of the base station. In addition, when event A2 is used, the load on the terminal may increase due to frequent measurement reports.

[0206] When receiving the above-mentioned measurement configuration information, the terminal 11f-01 may send a confirmation message (1f-20) to the base station 1f-02 indicating that the configuration information has been successfully received. To this end, an RRC reconfiguration completion (RRCReconfigurationComplete) message may be used. In operation 1f-25, the terminal 1 1f-01 may perform data communication with the base station 1f-02. In addition, in operation 1f-30, the terminal 1 1f-01 may start measuring measurement resources including the measurement objects (1f-31, 1f-32, 1f-33, 1f-34, 1f-35) of the CLI measurement and service cell configured in operation 1f-20. In operation 1f-25, the terminal 1 1f-01 may measure the cell-level measurement results of the MO configured with a downlink reference signal, measure the configured SRS-RSRP and CLI-RSSI signals of the MO associated with the CLI measurement, and determine the reporting conditions configured from the base station 1f-02. The reporting conditions configured from the base station 1f-02 may be configured differently according to intra-frequency / inter-frequency. In particular, in the case of inter-frequency channel measurement configuration, it may be necessary to indicate the carrier frequency information of the corresponding frequency. In operation 1f-35, the terminal 11f-01 may trigger a measurement reporting process according to the configured measurement reporting conditions. In this case, the measurement report may include a periodic report and an event-based report. The detailed report configuration may follow Figure 6 In operation 1f-40, terminal 1 1f-01 may report the measurement result to the base station via an RRC message. The report message may include the serving cell and surrounding cell measurement values ​​and the CLI measurement value. That is, the serving cell and surrounding cell measurement values ​​and the CLI measurement value may all be included in the report message, or each measurement value may be included therein.

[0207] refer to Figure 6, in operation 1f-40, when the terminal 11f-01 performs event-based reporting, the report message may include the measurement values ​​of all SRS resources included in the MO or may only include the measurement values ​​of the SRS resources that triggered the event. The value used for the measurement report may be an actual measurement value or an average value of the configured SRS resources. In addition, the measurement value of the serving cell defined in the existing NR system may not be included in the measurement report. In the NR system, the terminal is set to always report the measurement value of the serving cell. Since SRS measurement and reporting have little to do with the serving cell measurement value, even if the base station receives the serving cell measurement value, it may be ignored (in the case of the terminal, a specific value may be included and reported in the serving cell measurement value). In this case, ReportConfigNR-CLI, which is a new reporting configuration, can be used instead of the existing ReportConfigNR. Alternatively, when reporting CLI measurement values, it can also be restricted to always reporting the measurement values ​​of the serving cell.

[0208] Thereafter, in operation 1f-45, the base station 1f-02 may analyze the measurement value based on the measurement value received from the terminal 1 1f-01 and apply the analysis result to the network operation. For example, the analysis result may be applied to the switching process and dynamic TDD scheduling.

[0209] Figure 7 is a schematic diagram illustrating a method of measuring and reporting cross-interference links performed by a terminal according to an embodiment of the present disclosure.

[0210] Figure 6 The entire process of measuring and reporting cross-interference links from a system perspective is shown. Figure 7 The operation from the terminal's point of view is shown.

[0211] In operation 1g-05, the terminal in the connected state may receive a measurement configuration from the base station. The measurement configuration may include measObject, reportConfig, measID, quantitiConfig, etc. Specifically, the MO configuration may be a configuration of which signal is measured on which resource. The MO configuration may be configured to use CSI-RS and SSB, which are types of existing downlink reference signals, as measurement objects, and may also include measurement information of CLI (including SRS-RSRP and CLI-RSSI). The MO configuration of CLI may consider the following matters, for details and instructions, see Figure 6 .

[0212] - Use existing MO or use new MO for CLI measurement

[0213] - How to include SRS resource configuration information for CLI (list everything in MO or include SRS resource configuration index to measure)

[0214] - How to associate the configured MO with the serving cell

[0215] In addition, the measurement configuration received in operation 1g-05 may further include a reporting configuration, and in particular, may include a reporting condition associated with the MO for the CLI. In the present disclosure, event-based reporting will be mainly described, and its details and description will be referred to in Figure 6 .

[0216] - Define events for when the SRS-RSRP measurement exceeds a threshold: reuse existing A1 events or use new S1 events

[0217] - The number and method of reporting when multiple SRS resources are configured

[0218] ■ How to report only the measurement values ​​of the SRS resource that triggered the event or report all the measurement values ​​of the entire configured SRS resources

[0219] ■ How the measured values ​​follow the actual SRS-RSRP value or how the measured average of the configured SRS resources is used

[0220] ■ How to use a different threshold range than the one used for existing RS measurements and event triggering (SRS only), and how to use the new CLI measurement reporting configuration accordingly.

[0221] In operation 1g-10, the terminal may perform measurement on the configured MO according to the measurement configuration received in operation 1g-05. In operation 1g-10, when there is an MO configuration associated with the CLI, the terminal may measure the SRS resources configured in the corresponding MO, and in this case may perform measurement on the time-frequency resources in the activated downlink BWP.

[0222] In operation 1g-15, the terminal may determine a reporting condition for the CLI measurement for measurement, and prepare a report by including the measurement value in the measurement result when the reporting condition is met. Depending on the measurement report condition, both periodic reporting and event-based reporting are possible. In the case of event reporting, when the SRS-RSRP-based measurement value exceeds a threshold, the reporting process may be triggered by reusing the A1 event or by using a new S1 event.

[0223] In operation 1g-20, the measurement result as the measurement value generated in operation 1g-15 may be included in an RRC message and transmitted to the base station. Thereafter, the terminal may perform handover or resource reconfiguration according to the RRCReconfiguration message transmitted by the base station.

[0224] Figure 8is a schematic diagram illustrating an operation method of a terminal when event-based measurement reporting is configured for a cross-interference link according to an embodiment of the present disclosure.

[0225] In operation 1h-05, the terminal may receive an event-based measurement report configuration associated with the MO including configuration information for CLI measurement. The event-based measurement report configuration associated with the MO may be received by including measurement configuration information in an RRCReconfiguration message. A detailed description of the configuration information will be referred to in Figure 6 Description of Operation 1F-15. Figure 8 1 is a schematic diagram showing a case where an event-based measurement report is configured for a CLI measurement MO. In operations 1h-10, the terminal can trigger an event-based reporting process based on whether the measured value (SRS-RSRP) of the SRS resource in the configured CLI measurement MO exceeds a threshold. The event-based reporting process can operate as in the existing A1 event, and the threshold applied in this case can be reused as a value defined in the existing A1 event or redefined as a value with a new range. This may be because the RSRP ranges of the uplink reference signal and the downlink reference signal can be applied differently. When a new RSRP range is used, it can be redefined as a range for SRS-RSRP measurement and can be applied only to CLI measurements, in particular, only to SRS-RSRP mapping. In addition, a new event (e.g., S1) can be introduced instead of reusing the A1 event, and the A1 process can be applied as the entire process. In particular, since the ReportOnLeave configuration and operation can be introduced as is, the introduction of the A2 event (or S2 event) can be omitted. When the measured SRS-RSRP value drops below a threshold, A2 and S2 events may be triggered. In an embodiment of the present disclosure, A2 and S2 events may be used, but similar functions may replace A1 (S1) events and ReportOnLeave.

[0226] In operation 1h-15, when the CLI measurement result meets a specific event condition according to the measurement result in operation 1h-10, the terminal can trigger its measurement reporting process and store its measurement value. In operation 1h-20, the terminal can operate differently depending on which reporting method is configured for the terminal. That is, when multiple SRS resource configurations are included in the MO configured for CLI measurement (explicitly including SRS resource information to be measured or including SRS resource index to be measured), the terminal can use the measurement value applied to the event trigger as a value based on the actual measurement value or the average measurement value. When the terminal is configured to report based on the actual measured SRS-RSRP, it can proceed to operation 1h-25 and include the actual measured CLI measurement value in the measurement result. In this case, only the measurement information of the SRS resource that triggers the corresponding event may be included, or the measurement information of all SRS resources included in the configured MO may be included. In addition, the measurement information can basically include the SRS-RSRP value and may also include the CLI-RSSI value. In operation 1h-30, when the exit condition of the corresponding event is met, the terminal can re-execute the report on the corresponding event (1h-35). The following are the entry condition and exit condition of the A1 event, which can be applied to the corresponding event as is. When the exit condition is not met in operation 1h-30, a separate operation may not be performed.

[0227] Inequality A1-1 (entry condition)

[0228] Ms(measurement)-Hys(hysteresis)>thresh(threshold)

[0229] Inequality A1-2 (leave condition)

[0230] Ms+Hys <thresh

[0231] When multiple SRS resource configurations are included in the MO configured for CLI measurement in operation 1h-20 (explicitly including SRS resource information to be measured or including SRS resource indexes to be measured), the terminal can use the measurement value applied to the event trigger as a value based on an average measurement value rather than an actual measurement value. When this configuration is applied, the terminal can proceed to operation 1h-40 and include the average value of the measurement value in the measurement result instead of including the measurement value of the actual measured CLI measurement value. In this case as well, it may include only the measurement information of the SRS resource that triggers the corresponding event or may include the measurement information of all SRS resources included in the configured MO. In addition, the measurement information may basically include an SRS-RSRP value and may also include a CLI-RSSI value. In operation 1h-45, when the exit condition of the corresponding event is met, the terminal may re-execute the report on the corresponding event (1h-50). The following are the entry condition and exit condition of the A1 event, which can be applied to the corresponding event as is. When the exit condition is not met in operation 1h-45, a separate operation may not be performed.

[0232] Inequality A1-1 (entry condition)

[0233] Ms-Hys>Thresh

[0234] Inequality A1-2 (leave condition)

[0235] Ms+Hys <Thresh

[0236] Fig. 9 is a schematic diagram illustrating a method of measuring and reporting cross-interference links performed by a base station according to an embodiment of the present disclosure.

[0237] Fig. 9 This includes the measurement configuration for the base station to generate and send CLI measurements to the terminal. For a detailed description, see Figure 6 Related description.

[0238] When there is an RRC-connected terminal, the base station can provide measurement configuration information to the terminal through RRC configuration and apply it to subsequent terminal mobility and scheduling. In this disclosure, the parts related to CLI measurement will be described in detail and described in detail. Fig. 9 The general techniques will be omitted and only the CLI measurement part will be described.

[0239] In operation 1i-05, the base station may generate measurement configuration information for CLI measurement, which may include an MO configuration including an SRS resource configuration. The MO configuration in operation 1i-05 may use the existing measObjectNR as is or may introduce a new MO (measObjectNR-CLI) and include only a CLI-specific configuration. For this MO configuration, reference is made to Figure 6 Description of Operation 1F-15.

[0240] Thereafter, in operation 1i-10, the base station may generate configuration information for reporting in the measurement configuration information of the CLI measurement. In this case, periodic reporting and event-based measurement reporting may be configured separately, and the configuration information for reporting may include parameters related to conditions and methods required for reporting. The configuration information for reporting is described in detail in the following sections. Figure 6 Description of Operation 1F-15.

[0241] The base station may store the measurement configuration information configured in operations 1i-05 and 1i-10 and send configuration information and a report for CLI measurement to the terminal through an RRCReconfiguration message (in operation 1i-15). In this case, the measurement configuration process in the NR system may be applied, and the terminal receiving this may perform CLI measurement and reporting according to the information sent by the base station. In operation 1i-20, the base station may receive the measurement results included in the measurement report sent by the terminal. The measurement results may include CLI measurement results according to reporting conditions associated with the MO related to the configured CLI measurement. In operation 1i-25, when the received measurement report is a measurement result of a serving cell and a surrounding cell associated with an existing downlink reception signal, the base station may proceed to operation 1i-30 and determine switching based on the received measurement value. In addition, in operation 1i-35, the base station may perform a switching process.

[0242] However, in operation 1i-25, when the received measurement report is a measurement result associated with a CLI measurement value, the base station may proceed to operation 1i-40 and determine the dynamic allocation of TDD resources based on the measurement result. In addition, in operation 1i-45, the base station may directly perform dynamic TDD scheduling or perform scheduling within existing resources to reduce interference. In this case, performing dynamic TDD resource scheduling may mean that when it is determined as a result of a CLI measurement from a terminal that cross-link interference is significant in a corresponding DL measurement resource, the corresponding resource is not changed from a TDD resource to an uplink transmission. In addition, for resources with little interference, the uplink transmission resource time may be changed.

[0243] Fig.10 is a block diagram showing an internal structure of a terminal according to an embodiment of the present disclosure.

[0244] refer to Fig.10 The terminal may include a radio frequency (RF) processor 1j-10, a baseband processor 1j-20, a memory 1j-30, and a controller 1j-40. The controller 1j-40 may include a multi-connection processor 1j-42.

[0245] The RF processor 1j-10 can perform functions for sending / receiving signals on a wireless channel, such as frequency band conversion and amplification of signals. That is, the RF processor 1j-10 can up-convert the baseband signal provided by the baseband processor 1j-20 into an RF band signal and send the signal through an antenna, and can down-convert the RF band signal received by the antenna into a baseband signal. For example, the RF processor 1j-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). Although only one antenna is shown in the accompanying drawings, the terminal may include multiple antennas. In addition, the RF processor 1j-10 may include multiple RF chains. In addition, the RF processor 1j-10 can perform beamforming. For beamforming, the RF processor 1j-10 can adjust the phase and amplitude of each signal sent or received by multiple antennas or antenna elements. In addition, the RF processor can perform multiple-input multiple-output (MIMO) and can receive multiple layers when performing MIMO operations.

[0246] The baseband processor 1j-20 can perform the conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, during data transmission, the baseband processor 1j-20 can generate a composite symbol by encoding and modulating the transmission bit stream. In addition, during data reception, the baseband processor 1j-20 can recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1j-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 1j-20 can generate a composite symbol by encoding and modulating the transmission bit stream, mapping the composite symbol to a subcarrier and then configuring the OFDM symbol by an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, during data reception, the baseband processor 1j-20 can divide the baseband signal provided from the RF processor 1j-10 into OFDM symbol units, recover the signal mapped to the subcarrier by a fast Fourier transform (FFT) operation and then recover the received bit stream by demodulation and decoding.

[0247] The baseband processor 1j-20 and the RF processor 1j-10 can send and receive signals as described above. Therefore, the baseband processor 1j-20 and the RF processor 1j-10 can be referred to as a transmitter, a receiver, a transceiver, or a communicator. In addition, at least one of the baseband processor 1j-20 or the RF processor 1j-10 may include a plurality of communication modules to support a variety of different wireless access technologies. In addition, at least one of the baseband processor 1j-20 or the RF processor 1j-10 may include a plurality of communication modules to process signals of different frequency bands. For example, different wireless access technologies may include a wireless LAN (e.g., IEEE 802.11) and a cellular network (e.g., LTE). In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.5 GHz or 5 GHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0248] The memory 1j-30 may store data such as basic programs, applications, or configuration information for terminal operation. Specifically, the memory 1j-30 may store information related to a second access node for wireless communication using a second radio access technology. In addition, the memory 1j-30 may provide stored data at the request of the controller 1j-40.

[0249] The controller 1j-40 can control the overall operation of the terminal. For example, the controller 1j-40 can send / receive signals through the baseband processor 1j-20 and the RF processor 1j-10. In addition, the controller 1j-40 can write data to / read data from the memory 1j-30. For this purpose, the controller 1j-40 may include at least one processor. For example, the controller 1j-40 may include a communication processor (CP) for performing communication control and an application processor (AP) for controlling an upper layer such as an application.

[0250] Fig.11 is a block diagram showing a configuration of a base station according to an embodiment of the present disclosure.

[0251] like Fig.11 As shown, the base station may include an RF processor 1k-10, a baseband processor 1k-20, a backhaul communicator 1k-30, a memory 1k-40, and a controller 1k-50. The controller 1k-50 may include a multi-connection processor 1k-52.

[0252] The RF processor 1k-10 may perform functions for sending / receiving signals on a wireless channel, such as frequency band conversion and amplification of signals. That is, the RF processor 1k-10 may up-convert the baseband signal provided from the baseband processor 1k-20 into an RF band signal and send the signal through an antenna, and may down-convert the RF band signal received through the antenna into a baseband signal. For example, the RF processor 1k-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. Although only one antenna is shown in the accompanying drawings, the first access node may include multiple antennas. In addition, the RF processor 1k-10 may include multiple RF chains. In addition, the RF processor 1k-10 may perform beamforming. For beamforming, the RF processor 1k-10 may adjust the phase and amplitude of each signal sent / received through multiple antennas or antenna elements. The RF processor may perform downlink MIMO operations by sending one or more layers.

[0253] The baseband processor 1k-20 can perform a conversion function between a baseband signal and a bit stream according to the physical layer standard of the first wireless access technology. For example, during data transmission, the baseband processor 1k-20 can generate a composite symbol by encoding and modulating the transmission bit stream. In addition, during data reception, the baseband processor 1k-20 can recover the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1k-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 1k-20 can generate a composite symbol by encoding and modulating the transmission bit stream, map the composite symbol to a subcarrier, and then configure the OFDM symbol by IFFT operation and CP insertion. In addition, during data reception, the baseband processor 1k-20 can divide the baseband signal provided from the RF processor 1k-10 into OFDM symbol units, recover the signal mapped to the subcarrier by FFT operation, and then recover the received bit stream by demodulation and decoding. The baseband processor 1k-20 and the RF processor 1k-10 can send and receive signals as described above. Therefore, the baseband processor 1k-20 and the RF processor 1k-10 can be referred to as a transmitter, a receiver, a transceiver, a communicator, or a wireless communicator.

[0254] The backhaul communicator 1k-30 may provide an interface for communicating with other nodes in the network. That is, the backhaul communicator 1k-30 may convert a bit stream sent from a main base station to another node (e.g., an auxiliary base station, a core network, etc.) into a physical signal, and may convert a bit stream received from another node into a physical signal.

[0255] The memory 1k-40 may store data such as basic programs, applications, or configuration information for the operation of the main base station. Specifically, the memory 1k-40 may store information about the bearer assigned to the connection terminal, the measurement result reported from the connection terminal, etc. In addition, the memory 1k-40 may store information as a reference for determining whether to provide or terminate a multi-way connection to the terminal. In addition, the memory 1k-40 may provide the stored data at the request of the controller 1k-50.

[0256] The controller 1k-50 may control the overall operation of the master base station. For example, the controller 1k-50 may send / receive signals through the baseband processor 1k-20 and the RF processor 1k-10 or through the backhaul communicator 1k-30. In addition, the controller 1k-50 may write / read data to / from the memory 1k-40. To this end, the controller 1k-50 may include at least one processor.

[0257] The method according to the embodiment of the present disclosure described in the specification or claims can be implemented by hardware, software or a combination thereof.

[0258] When these methods are implemented by software, a computer-readable storage medium or a computer program product may be provided to store one or more programs (software modules). One or more programs stored in a computer-readable storage medium or a computer program product may be configured to be executed by one or more processors in an electronic device. One or more programs may include instructions for causing an electronic device to perform a method according to an embodiment of the present disclosure described in the specification or claims.

[0259] These programs (software modules or software) may be stored in random access memory (RAM), non-volatile memory (including flash memory), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, compact disk-ROM (CD-ROM), digital versatile disk (DVD), other types of optical storage devices or magnetic tapes. Alternatively, the program may be stored in a memory configured by a combination of some or all of these storage devices. In addition, each of these memories may be provided in plural.

[0260] In addition, the program can be stored in an attachable storage device that can be accessed through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or through a communication network configured by any combination thereof. Such a storage device can be connected to the apparatus for executing the embodiments of the present disclosure through an external port. In addition, a separate storage device on a communication network can be connected to the apparatus for executing the embodiments of the present disclosure.

[0261] In the above specific embodiments of the present disclosure, the components included in the present disclosure are expressed in singular or plural form according to the specific embodiments of the present disclosure presented. However, for convenience of explanation, the singular or plural expression is appropriately selected according to the provided situation, the present disclosure is not limited to singular or plural components, and the components expressed in plural can even be configured in singular or the components expressed in singular can even be configured in plural.

[0262] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method for measuring and reporting cross-link interference CLI by a user equipment UE in a wireless communication system, the method comprising: receiving, from a base station, a measurement configuration of at least one measurement object including a CLI; performing measurement of the configured measurement objects of the CLI included in the measurement configuration; and In the case where event-based CLI measurement reporting is configured, based on an event in which a first measurement value of at least one resource from multiple CLI measurement resources of the configured measurement object exceeds a threshold, a measurement report of the at least one resource from multiple CLI measurement resources of the configured measurement object whose first measurement value exceeds the threshold is sent to the base station.

2. The method of claim 1, wherein: The threshold comprises a value associated with the at least one resource used to measure the CLI.

3. The method of claim 1, further comprising: Based on a first measurement value of the at least one resource from a plurality of CLI measurement resources of the configured measurement object exceeding the threshold and a second measurement value according to a measurement performed thereafter being lower than the threshold, a measurement report for the at least one resource of the configured measurement object is sent again.

4. The method of claim 3, wherein: The first measurement is obtained by subtracting a hysteresis parameter from a measurement of the at least one resource, and The second measurement value is obtained by adding the measurement result of the at least one resource and the hysteresis parameter.

5. The method of claim 1, wherein: Performing measurement of the configured measurement object of the CLI included in the measurement configuration includes: The measurement is performed on all resources in the plurality of CLI measurement resources of the configured measurement object.

6. The method of claim 1, wherein: The measurement configuration includes information about the at least one measurement object and information about at least one resource for measuring a CLI for each of the at least one measurement object.

7. The method of claim 1, wherein: The at least one resource from among the plurality of CLI measurement resources includes at least one of a sounding reference signal (SRS) resource for measuring CLI and a resource for measuring a received signal strength indication (RSSI).

8. The method of claim 1, wherein: The measurement report includes at least one of a sounding reference signal-reference signal received power SRS-RSRP and a cross link interference-received signal strength indication CLI-RSSI.

9. The method of claim 1, wherein: Sending a measurement report includes: Sending a measurement report of the serving cell of the UE to the base station.

10. A user equipment UE for measuring and reporting cross link interference CLI in a wireless communication system, the UE comprising: Transceiver; and At least one processor configured to: receiving, from a base station, a measurement configuration of at least one measurement object including a CLI; performing measurement of the configured measurement objects of the CLI included in the measurement configuration; and Control the transceiver to: when event-based CLI measurement reporting is configured, based on an event in which a first measurement value of at least one resource from the multiple CLI measurement resources of the configured measurement object exceeds a threshold, send a measurement report of the at least one resource from the multiple CLI measurement resources of the configured measurement object whose first measurement value exceeds the threshold to the base station.

11. The UE according to claim 10, wherein: The at least one processor is further configured to: The transceiver is controlled to resend a measurement report for the at least one resource of the configured measurement object based on a first measurement value of the at least one resource from a plurality of CLI measurement resources of the configured measurement object exceeding the threshold and a second measurement value according to a measurement performed thereafter being lower than the threshold.

12. The UE according to claim 11, wherein: The first measurement is obtained by subtracting a hysteresis parameter from a measurement of the at least one resource, and The second measurement value is obtained by adding the measurement result of the at least one resource and the hysteresis parameter.

13. The UE according to claim 10, wherein: The at least one processor is further configured to: The measurement is performed on all resources in the plurality of CLI measurement resources of the configured measurement object.

14. The UE according to claim 10, wherein: The at least one resource from among the plurality of CLI measurement resources includes at least one of a sounding reference signal (SRS) resource for measuring CLI and a resource for measuring a received signal strength indication (RSSI).

15. The UE according to claim 10, wherein: The at least one processor is further configured to: and controlling the transceiver to send a measurement report of a serving cell of the UE to the base station.

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