WO2022045807A1 - 무선 통신 시스템에서 협력 통신을 이용한 데이터 송수신 방법 및 장치 - Google Patents
무선 통신 시스템에서 협력 통신을 이용한 데이터 송수신 방법 및 장치 Download PDFInfo
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Definitions
- the present disclosure relates to a wireless communication system, and more particularly, to cell-to-cell cooperative communication using a plurality of cells.
- the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or the LTE system after (Post LTE).
- the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band).
- mmWave very high frequency
- FD-MIMO Full Dimensional MIMO
- array antenna analog beam-forming, and large scale antenna technologies are being discussed.
- cloud radio access network cloud radio access network: cloud RAN
- ultra-dense network ultra-dense network
- D2D Device to Device communication
- wireless backhaul moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway.
- CoMP Coordinated Multi-Points
- ACM advanced coding modulation
- FQAM Hybrid FSK and QAM Modulation
- SWSC Small Cell Superposition Coding
- advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.
- FBMC Filter Bank Multi Carrier
- NOMA non orthogonal multiple access
- SCMA sparse code multiple access
- IoT Internet of Things
- IoE Internet of Everything
- M2M Machine Type Communication
- MTC Machine Type Communication
- IoT an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided.
- IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to
- 5G communication technology is implemented by techniques such as beam forming, MIMO, and array antenna.
- cloud radio access network cloud RAN
- CoMP Coordinatd multi-point
- CoMP is a technology that reduces inter-cell interference and increases the throughput of the UE at the cell boundary by enabling neighboring cells to cooperate with each other so that not only the serving cell but also other cells can communicate with the same UE.
- the present disclosure discloses a plurality of transmission reception point (TRP) (hereinafter, Multiple TRP) based CoMP (eg, We propose various techniques for NC-JT (non-coherent joint transmission). Specifically, a method of grouping a plurality of cells and a method of setting a CORESET structure to be monitored by a UE in a cell composed of a group are proposed. In addition, higher layer signaling for a terminal is specifically proposed according to a cell grouping method.
- TRP transmission reception point
- CoMP CoMP
- the method comprising: receiving configuration information related to a multi-transmission reception point (TRP); checking whether inter-cell multi-TRP transmission is configured based on the configuration information; when the inter-cell multi-TRP transmission is configured, checking a control resource set (CORESET) for multi-TRP based on the configuration information; receiving downlink control information (DCI) for the multi-TRP through the CORESET; and receiving data from the multi-TRP based on the DCI.
- TRP multi-transmission reception point
- CORESET control resource set
- DCI downlink control information
- the method comprising: transmitting configuration information related to a multi-transmission reception point (TRP); When inter-cell multi-TRP transmission is configured, downlink control information for the multi-TRP through CORESET (control resource set) for multi-TRP based on the configuration information (downlink control information: DCI) ) to transmit; and transmitting data through the multi-TRP based on the DCI.
- TRP multi-transmission reception point
- a transceiver in a terminal in a wireless communication system, a transceiver; and receives configuration information related to a multi-TRP (transmission reception point) through the transceiver, checks whether inter-cell multi-TRP transmission is configured based on the configuration information, and cell) when multi-TRP transmission is set, check CORESET (control resource set) for multi-TRP based on the configuration information, and downlink control information for multi-TRP through the CORESET through the transceiver ( downlink control information: DCI), and a controller configured to receive data from the multi-TRP based on the DCI through the transceiver.
- a multi-TRP transmission reception point
- DCI downlink control information
- a control unit that transmits downlink control information (DCI) for the multi-TRP through the resource set) through the transceiver, and transmits data through the multi-TRP based on the DCI through the transceiver It is characterized in that it includes.
- DCI downlink control information
- a method of a terminal in a wireless communication system comprising: receiving configuration information related to cooperative transmission from a serving cell of a base station; checking whether cooperative transmission between the serving cell and a non-serving cell is configured based on the configuration information; If the cooperative transmission is set, checking a CORESET (control resource set) for cooperative transmission based on the setting information; Receiving downlink control information (DCI) for the cooperative transmission through the CORESET; and receiving data from the serving cell and the non-serving cell based on the DCI.
- DCI downlink control information
- FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in a wireless communication system according to an embodiment of the present disclosure.
- FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a 5G system.
- FIG. 3 is a diagram for explaining a setting of a bandwidth portion in a wireless communication system according to an embodiment of the present disclosure.
- FIG. 4 is a diagram illustrating a method of dynamically changing a setting for a bandwidth portion according to an embodiment of the present disclosure.
- Control Resource Set Control Resource Set, CORESET
- FIG. 6 is a diagram illustrating a procedure for reporting UE capability according to an embodiment of the present disclosure.
- FIG. 7 is a diagram for explaining the configuration of a cooperative communication antenna port according to an embodiment of the present disclosure.
- 8A is a diagram illustrating a scenario of configuring multi-TRP according to an embodiment of the present disclosure.
- 8B is a diagram illustrating a scenario of configuring multi-TRP according to an embodiment of the present disclosure.
- 8C is a diagram illustrating a scenario of configuring multi-TRP according to an embodiment of the present disclosure.
- 8D is a diagram illustrating a scenario of configuring multi-TRP according to an embodiment of the present disclosure.
- FIG. 9 is a diagram illustrating a CORESETPoolIndex setting method of M-TRP based on Multi-DCI according to an embodiment of the present disclosure.
- FIG. 10 is a diagram illustrating a method of setting CORESETPoolIndex according to an embodiment of the present disclosure.
- FIG. 11 is a diagram illustrating a method of setting CORESETPoolIndex according to an embodiment of the present disclosure.
- FIG. 12 is a diagram illustrating a method of setting CORESETPoolIndex according to an embodiment of the present disclosure.
- FIG. 13 is a diagram illustrating an operation of a terminal according to an embodiment of the present disclosure.
- FIG. 14 is a diagram illustrating an operation of a base station according to an embodiment of the present disclosure.
- 15 is a diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.
- 16 is a diagram illustrating a structure of a base station according to an embodiment of the present disclosure.
- each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions.
- These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions.
- These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory.
- the instructions stored in the flow chart block(s) may also be possible for the instructions stored in the flow chart block(s) to produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s).
- the computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It may also be possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).
- each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it may be possible that the blocks are sometimes performed in a reverse order according to a corresponding function.
- ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' performs certain roles do.
- '-part' is not limited to software or hardware.
- ' ⁇ ' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors.
- ' ⁇ part' refers to components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and programs. Includes procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
- components and ' ⁇ units' may be combined into a smaller number of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
- components and ' ⁇ units' may be implemented to play one or more CPUs in a device or secure multimedia card.
- ' ⁇ unit' may include one or more processors.
- the base station is a subject that performs resource allocation of the terminal, and may be at least one of gNode B, eNode B, Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network.
- the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
- UE user equipment
- MS mobile station
- a cellular phone a smart phone
- a computer or a multimedia system capable of performing a communication function.
- a description will be given of a technique for a terminal to receive broadcast information from a base station in a wireless communication system.
- the present disclosure relates to a communication technique that converges a 5 th generation (5G) communication system for supporting a higher data rate after the 4 th generation (4G) system with Internet of Things (IoT) technology, and a system thereof.
- the present disclosure provides intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. ) can be applied to
- Terms referring to, terms referring to messages, terms referring to components of an apparatus, and the like are exemplified for convenience of description. Accordingly, the present invention is not limited to the terms described below, and other terms having equivalent technical meanings may be used.
- 3GPP LTE 3rd generation partnership project long term evolution
- present invention is not limited by the terms and names, and may be equally applied to systems conforming to other standards.
- a wireless communication system for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e, such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.
- HSPA High Speed Packet Access
- LTE-A Long Term Evolution-A
- LTE-Pro LTE-Pro
- 3GPP2 HRPD High Rate Packet Data
- UMB Ultra Mobile Broadband
- IEEE 802.16e such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.
- Uplink refers to a radio link in which a UE (User Equipment) or MS (Mobile Station) transmits data or control signals to a base station (eNode B, or base station (BS)). It means a wireless link that transmits data or control signals.
- the multiple access method as described above divides the data or control information of each user by allocating and operating the time-frequency resources to which data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. .
- the 5G communication system must be able to freely reflect various requirements such as users and service providers, so services that satisfy various requirements must be supported.
- Services considered for the 5G communication system include Enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC). etc.
- the eMBB aims to provide a data transfer rate that is more improved than the data transfer rate supported by existing LTE, LTE-A, or LTE-Pro.
- the eMBB should be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station.
- it is necessary to provide an increased user perceived data rate of the terminal.
- transmission/reception technology including a more advanced multi-input multi-output (MIMO) transmission technology.
- MIMO multi-input multi-output
- mMTC is being considered to support application services such as the Internet of Things (IoT) in the 5G communication system.
- IoT Internet of Things
- mMTC may require large-scale terminal access support, improved terminal coverage, improved battery life, and reduced terminal cost within a cell. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km2) within a cell.
- a terminal supporting mMTC is highly likely to be located in a shaded area that a cell cannot cover, such as the basement of a building, due to the nature of the service, it may require wider coverage compared to other services provided by the 5G communication system.
- a terminal supporting mMTC should be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time may be required.
- URLLC as a cellular-based wireless communication service used for a specific purpose (mission-critical), remote control for a robot or machine, industrial automation
- a service used in an unmaned aerial vehicle, remote health care, emergency alert, etc. it is necessary to provide communication that provides ultra-low latency and ultra-reliability.
- a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time has a requirement of a packet error rate of 10-5 or less. Therefore, for a service supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time, a design requirement for allocating a wide resource in a frequency band is required.
- TTI transmit time interval
- the aforementioned mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-described examples.
- each service considered in the above-mentioned 5G communication system should be provided by convergence with each other based on one framework. That is, for efficient resource management and control, it is preferable that each service is integrated and controlled and transmitted as a single system rather than being operated independently.
- the embodiment of the present invention will be described below using LTE, LTE-A, LTE Pro, or NR system as an example, the embodiment of the present invention may be applied to other communication systems having a similar technical background or channel type. In addition, the embodiments of the present invention can be applied to other communication systems through some modifications within the scope of the present invention as judged by a person having skilled technical knowledge.
- Terms referring to, terms referring to messages, terms referring to components of an apparatus, and the like are exemplified for convenience of description. Accordingly, the present invention is not limited to the terms described below, and other terms having equivalent technical meanings may be used.
- 3GPP LTE 3rd generation partnership project long term evolution
- present invention is not limited by the terms and names, and may be equally applied to systems conforming to other standards.
- FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in a wireless communication system.
- the horizontal axis represents the time domain
- the vertical axis represents the frequency domain
- a basic unit of a resource in the time and frequency domain is a resource element (RE) (1-01) as 1 OFDM (orthogonal frequency division multiplexing) symbol (1-02) on the time axis and 1 subcarrier on the frequency axis It can be defined as (1-03).
- RE resource element
- 1-02 1 OFDM (orthogonal frequency division multiplexing) symbol
- 1-03 resource block
- RB resource block
- FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a 5G system.
- FIG. 2 an example of a structure of a frame 2-00, a subframe 2-01, and a slot 2-02 is illustrated in FIG. 2 .
- One frame (2-00) may be defined as 10 ms.
- One subframe (2-01) may be defined as 1 ms, and one frame (2-00) may consist of a total of 10 subframes (2-01).
- One subframe (2-01) may consist of one or a plurality of slots (2-02, 2-03), and the number of slots (2-02, 2-03) per one subframe (2-01) may be different depending on the set value ⁇ (2-04, 2-05) for the subcarrier spacing.
- each subcarrier spacing setting ⁇ and may be defined as in [Table 1] below.
- one component carrier (CC) or serving cell may consist of up to 250 or more RBs. Therefore, when the terminal always receives the entire serving cell bandwidth (serving cell bandwidth) like LTE, the power consumption of the terminal may be extreme, and in order to solve this, the base station provides one or more bandwidth parts (BWP) to the terminal. It can be configured to support the UE to change the reception area within the cell.
- BWP bandwidth parts
- the base station may set 'initial BWP', which is the bandwidth of CORESET #0 (or common search space, CSS), to the terminal through the MIB. Thereafter, the base station sets the initial BWP (first BWP) of the terminal through RRC signaling, and may notify at least one or more BWP configuration information that may be indicated through future downlink control information (DCI). . Thereafter, the base station may indicate which band the terminal uses by announcing the BWP ID through DCI. If the terminal does not receive DCI in the currently allocated BWP for a specific time or longer, the terminal returns to the 'default BWP' and attempts to receive DCI.
- 'initial BWP' which is the bandwidth of CORESET #0 (or common search space, CSS)
- the base station sets the initial BWP (first BWP) of the terminal through RRC signaling, and may notify at least one or more BWP configuration information that may be indicated through future downlink control information (DCI).
- DCI downlink control
- FIG. 3 is a diagram for explaining a setting of a bandwidth portion in a wireless communication system according to an embodiment of the present disclosure.
- the terminal bandwidth 3-00 may include two bandwidth portions, namely, a bandwidth portion #1(3-01) and a bandwidth portion #2(3-02).
- the base station may set one or more bandwidth portions to the terminal, and may set information as shown in [Table 2] below for each bandwidth portion.
- Setting information 1 Bandwidth in the bandwidth portion (number of PRBs that make up the bandwidth portion)
- Setting information 2 The frequency position of the bandwidth part (such information may include an offset value compared to the reference point A, and the reference point may include, for example, the center frequency of a carrier wave, a synchronization signal, a synchronization signal raster, etc.)
- Setting information 3 Numerology of the bandwidth part (eg, subcarrier spacing, CP (Cyclic Prefix) length, etc.) etc.
- various parameters related to the bandwidth portion may be set in the terminal.
- the above-described information may be transmitted by the base station to the terminal through higher layer signaling, for example, RRC signaling.
- At least one bandwidth part among the set one or a plurality of bandwidth parts may be activated. Whether to activate the set bandwidth portion may be semi-statically transmitted from the base station to the terminal through RRC signaling, or may be dynamically transmitted through a MAC control element (MAC CE) or DCI.
- MAC CE MAC control element
- the setting of the bandwidth part supported by the above-described 5G communication system may be used for various purposes.
- the bandwidth supported by the terminal when the bandwidth supported by the terminal is smaller than the system bandwidth, the bandwidth supported by the terminal may be supported by setting the bandwidth portion. For example, in [Table 2], the frequency position of the bandwidth part (setting information 2) is set for the terminal, so that the terminal can transmit and receive data at a specific frequency position within the system bandwidth.
- the base station may configure a plurality of bandwidth portions for the terminal. For example, in order to support both data transmission and reception using a subcarrier interval of 15 kHz and a subcarrier interval of 30 kHz to an arbitrary terminal, two bandwidth portions may be configured to use a subcarrier interval of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be subjected to frequency division multiplexing (FDM), and when data is transmitted/received at a specific subcarrier interval, a bandwidth portion set for the corresponding subcarrier interval may be activated.
- FDM frequency division multiplexing
- the base station may configure a bandwidth portion having different sizes of bandwidths for the terminal. For example, when the terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz and always transmits/receives data using the corresponding bandwidth, very large power consumption may be caused. In particular, it is very inefficient in terms of power consumption for the UE to monitor an unnecessary downlink control channel for a large bandwidth of 100 MHz in a situation in which there is no traffic. Therefore, for the purpose of reducing power consumption of the terminal, the base station may set a relatively small bandwidth portion for the terminal, for example, a bandwidth portion of 20 MHz. In the absence of traffic, the UE may perform a monitoring operation in the 20 MHz bandwidth portion, and when data is generated, it may transmit/receive data using the 100 MHz bandwidth portion according to the instruction of the base station.
- FIG. 4 is a diagram illustrating a method of dynamically changing a setting for a bandwidth portion according to an embodiment of the present disclosure.
- the base station may set one or more bandwidth parts to the terminal, and as settings for each bandwidth part, the bandwidth of the bandwidth part, the frequency position of the bandwidth part, Information on the numerology of the bandwidth part may be informed to the terminal.
- two bandwidth portions within the terminal bandwidth 4-00 to the terminal namely, bandwidth portion #1 (BWP#1, 4-05) and bandwidth portion #2 (BWP#2, 4-05) 10) can be set.
- bandwidth portion #1 BWP#1, 4-05)
- bandwidth portion #2 BWP#2, 4-05
- One or a plurality of bandwidth portions may be activated among the set bandwidths, and an example in which one bandwidth portion is activated may be considered in FIG. 4 .
- the bandwidth part #1 (4-05) is activated among the set bandwidth parts, and the terminal controls the control region #1 ( 4-45) may monitor a Physical Downlink Control Channel (PDCCH), and may transmit/receive data 4-55 in bandwidth part #1 (4-05).
- a control region in which the terminal receives the PDCCH may be different according to which bandwidth portion among the configured bandwidth portions is activated, and accordingly, the bandwidth in which the terminal monitors the PDCCH may vary.
- the base station may additionally transmit an indicator for changing the configuration of the bandwidth portion to the terminal.
- changing the setting for the bandwidth portion may be considered the same as an operation of activating a specific bandwidth portion (eg, changing the activation from the bandwidth portion A to the bandwidth portion B).
- the base station may transmit a configuration switching indicator to the terminal in a specific slot.
- the terminal After receiving the configuration change indicator from the base station, the terminal may determine a bandwidth portion to be activated by applying the changed configuration according to the configuration change indicator from a specific time point.
- the UE may perform monitoring for the PDCCH in the control region set in the activated bandwidth portion.
- the base station instructs the terminal to change the activated bandwidth part from the existing bandwidth part #1 (4-05) to the bandwidth part #2 (4-10) (Configuration Switching Indication, 4-15) can be transmitted in slot #1 (4-30).
- the terminal may activate the bandwidth part #2 (4-10) according to the content of the indicator.
- a transition time (4-20) for changing the bandwidth portion may be required, and accordingly, a time point for changing and applying the active bandwidth portion may be determined.
- 4 shows a case in which a transition time 4-20 of one slot is required after receiving the setting change indicator 4-15. In the transition time (4-20), data transmission/reception may not be performed (4-60). Accordingly, the bandwidth portion #2 (4-10) is activated in the slot #2 (4-35) and the slot #3 (4-40), so that the control channel and data can be transmitted/received through the corresponding bandwidth portion.
- the base station may preset one or more bandwidth parts to the terminal as higher layer signaling (eg, RRC signaling), and the configuration change indicator 4-15 is activated in a way that is mapped with one of the bandwidth part settings preset by the base station. can be instructed.
- an indicator of log 2 N bits may indicate by selecting one of N preset bandwidth parts.
- Table 3 an example of indicating configuration information for a bandwidth portion using a 2-bit indicator is described.
- Bandwidth Partial Settings 00 Bandwidth setting A set by upper layer signaling 01
- Bandwidth setting B set with higher layer signaling 10
- Bandwidth setting C set with higher layer signaling 11
- Bandwidth setting D set by upper layer signaling
- the configuration change indicator 4-15 for the bandwidth portion described in FIG. 4 is in the form of MAC (Medium Access Control) CE (Control Element) signaling or L1 signaling (eg, common DCI, group-common DCI, terminal-specific DCI) may be transmitted from the base station to the terminal.
- MAC Medium Access Control
- CE Control Element
- L1 signaling eg, common DCI, group-common DCI, terminal-specific DCI
- the configuration change indicator 4-15 for the bandwidth portion described in FIG. 4 from which point in time the bandwidth portion activation is applied may depend on the following. From which point in time the setting change is applied, it follows a predefined value (eg, it is applied from N ( ⁇ 1) slots after receiving the setting change indicator), or is set from the base station to the UE through higher layer signaling (eg RRC signaling), or , may be partially included in the contents of the setting change indicator 4-15 and transmitted. Alternatively, the timing at which the setting change is applied may be determined by a combination of the above-described methods. After receiving the configuration change indicator 4-15 for the bandwidth portion, the terminal may apply the changed configuration from the point in time obtained by the above-described method.
- a predefined value eg, it is applied from N ( ⁇ 1) slots after receiving the setting change indicator
- RRC signaling eg RRC signaling
- Control Resource Set Control Resource Set, CORESET
- control region #1 (5-01), control Area #2 (5-02)
- the control regions 5-01 and 5-02 may be set in a specific frequency resource 5-03 within the entire terminal bandwidth portion 5-10 on the frequency axis.
- the control regions 5-01 and 5-02 may be set with one or more OFDM symbols on the time axis, and may be defined by a control region length (Control Resource Set Duration, 5-04).
- the control region #1 (5-01) is set to a control region length of two symbols
- the control region #2 (5-02) is set to a control region length of one symbol.
- the control region in the 5G system described above may be set by the base station to the terminal through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling).
- Setting the control region to the terminal means to provide the terminal with information such as a control region identifier (Identity), a frequency position of the control region, and a symbol length of the control region.
- information for setting the control region to the terminal may include information according to Table 4-1.
- tci-StatesPDCCH (simply named TCI state) configuration information is one or more SS (synchronization) in a QCL (quasi co-located) relationship with DMRS (demodulation reference signal) transmitted in the corresponding control region. signal)/physical broadcast channel (PBCH) block (referred to as SSB or SS/PBCH block) index or CSI-RS (channel state information reference signal) index information.
- SSB physical broadcast channel
- SS/PBCH block referred to as SSB or SS/PBCH block index
- CSI-RS channel state information reference signal
- one or more different antenna ports (or one or more channels, signals, and combinations thereof may be replaced, but in the present disclosure in the future, for convenience, different antenna ports are collectively referred to) They can be associated with each other by QCL settings as shown in [Table 4-2] below.
- the QCL setting can connect two different antenna ports in a relationship between a (QCL) target antenna port and a (QCL) reference antenna port, and the terminal can perform statistical characteristics (e.g., For example, all or part of the large scale parameters of the channel such as Doppler shift, Doppler spread, average delay, delay spread, average gain, and spatial Rx (or Tx) parameters or the reception spatial filter coefficient or transmission spatial filter coefficient of the terminal) are set to the target antenna port. It can be applied (or assumed) upon reception.
- statistical characteristics e.g., For example, all or part of the large scale parameters of the channel such as Doppler shift, Doppler spread, average delay, delay spread, average gain, and spatial Rx (or Tx) parameters or the reception spatial filter coefficient or transmission spatial filter coefficient of the terminal
- the target antenna port refers to an antenna port for transmitting a channel or signal set by a higher layer setting including the QCL setting, or an antenna port for transmitting a channel or signal to which a TCI state indicating the QCL setting is applied. .
- the reference antenna port means an antenna port for transmitting a channel or signal indicated (specific) by a referenceSignal parameter in the QCL configuration.
- the statistical characteristics of the channel defined by the QCL setting may be classified according to the QCL type as follows.
- o 'QCL-TypeA' ⁇ Doppler shift, Doppler spread, average delay, delay spread ⁇
- the types of QCL type are not limited to the above four types, but all possible combinations are not listed in order not to obscure the gist of the description.
- the bandwidth and transmission period of the target antenna port are both sufficient compared to the reference antenna port (that is, the number of samples and the transmission band/time of the target antenna port in both the frequency axis and the time axis are the number of samples and transmission of the reference antenna port. More than band/time)
- QCL-TypeB is a QCL type used when the bandwidth of the target antenna port is sufficient to measure measurable statistical characteristics on the frequency axis, that is, Doppler shift and Doppler spreads.
- QCL-TypeC is a QCL type used when the bandwidth and transmission period of the target antenna port are insufficient to measure second-order statistics, that is, Doppler spread and delay spreads, so that only first-order statistics, that is, Doppler shift and average delay, can be referred to. .
- QCL-TypeD is a QCL type set when spatial reception filter values used when receiving a reference antenna port can be used when receiving a target antenna port.
- the base station can set or instruct up to two QCL settings to one target antenna port through the TCI state setting as shown in [Table 4-3] below.
- the first QCL setting may be set to one of QCL-TypeA, QCL-TypeB, and QCL-TypeC.
- the settable QCL type is specified according to the types of the target antenna port and the reference antenna port and will be described in detail below.
- the second QCL setting among the two QCL settings included in the one TCI state setting may be set to QCL-TypeD, and may be omitted in some cases.
- FIG. 6 is a diagram illustrating a procedure for reporting UE capability according to an embodiment of the present disclosure.
- the terminal may perform a procedure of reporting the capability supported by the terminal to the corresponding base station while connected to the serving base station.
- this may be referred to as UE capability report.
- the base station may transmit a UE capability enquiry message for requesting capability report to the terminal in the connected state in step 601 .
- the UE capability inquiry message may include a UE capability request for each RAT type.
- the request for each RAT type may include requested frequency band information.
- the UE capability enquiry message may include a plurality of RAT types in one RRC message container.
- a UE capability enquiry message including a request for each RAT type may be delivered to the UE multiple times. That is, the UE capability enquiry message is repeatedly transmitted a plurality of times, and the UE may configure and report a corresponding UE capability information message.
- the base station may request UE capability for MR-DC including NR, LTE, and EN-DC.
- the base station may transmit a UE capability inquiry message after the terminal is connected, and may also request a UE capability report under any conditions when the base station is needed.
- the terminal may configure or acquire UE capability according to the RAT type and band information included in the UE capability enquiry message.
- the UE capability may include information on whether the terminal supports the multi-TRP operation. Also, the UE Capability may include information on whether the UE supports multi-TRP operation for inter-cell. Accordingly, the UE capability may be referred to as a Multi-TRP related capability.
- the terminal may transmit a UE capability information message including the UE capability to the base station in step 602 .
- the base station may then perform scheduling and transmission/reception management appropriate for the corresponding terminal based on the UE capability received from the terminal.
- FIG. 7 is a diagram for explaining the configuration of a cooperative communication antenna port according to an embodiment of the present disclosure.
- FIG. 7 an example of radio resource allocation for each transmission reception point (TRP) according to a joint transmission (JT) technique and a situation is illustrated.
- 700 is a diagram illustrating coherent joint transmission (C-JT) supporting coherent precoding between each cell, TRP, and/or beam.
- C-JT coherent joint transmission
- TRP A 705 and TRP B 710 transmit the same data (PDSCH), and joint precoding can be performed in multiple TRPs. This may mean that the TRP A 705 and the TRP B 710 transmit the same DMRS ports (eg, DMRS ports A and B in both TRPs).
- the terminal 715 may receive one piece of DCI information for receiving one PDSCH demodulated by a reference signal received through DMRS ports A and B.
- FIG. 7 720 is a diagram illustrating non-coherent joint transmission (NC-JT) supporting non-coherent precoding between each cell, TRP and/or beam.
- NC-JT non-coherent joint transmission
- different PDSCHs may be transmitted in each cell, TRP, and/or beam, and individual precoding may be applied to each PDSCH.
- the TRP A 725 and the TRP B 730 transmit different DMRS ports (eg, DMRS port A in TRP A and DMRS port B in TRP B).
- the terminal 735 may receive two types of DCI information for receiving PDSCH A demodulated by DMRS port A and PDSCH B demodulated by another DMRS port B.
- NC-JT which transmits data from two or more transmission points to one terminal at the same time
- PDSCHs transmitted from two (or more) different transmission points are allocated through a single PDCCH, or two It is necessary to allocate PDSCHs transmitted from the above different transmission points.
- the UE acquires a QCL (quasi co-location) connection relationship between each reference signal or channel based on L1/L2/L3 signaling, and through this, efficiently estimates large scale parameters of each reference signal or channel can do. If the transmission point of the reference signal or channel is different, since large scale parameters are difficult to share with each other, when performing cooperative transmission, the base station simultaneously informs the terminal of quasi co-location information for two or more transmission points. It is necessary to inform through two or more TCI states.
- non-coherent cooperative transmission is supported through multiple PDCCHs, that is, when two or more PDCCHs allocate two or more PDSCHs to the same serving cell and the same bandwidth portion at the same time, two or more TCI states are each PDCCH It may be allocated to each PDSCH to DMRS ports, respectively.
- the two or more TCI states are one It may be allocated to each PDSCH to DMRS ports through the PDCCH of .
- the DMRS ports allocated to the terminal at a specific time are divided into a DMRS port group A transmitted from a transmission point A and a DMRS port group B transmitted from a transmission point B, two or more TCI states are respectively connected to the DMRS port group. and a channel can be estimated based on different QCL assumptions for each group.
- different DMRS ports may be subjected to code division multiplexing (CDM), frequency division multiplexing (FDM), or time domain multiplexing (TDM) in order to increase channel measurement accuracy and reduce transmission burden at the same time.
- CDM code division multiplexing
- FDM frequency division multiplexing
- TDM time domain multiplexing
- CDM group when the DMRS ports used for CDM are collectively referred to as the CDM group, code-based multiplexing works well when the channel characteristics of each port are similar to the DMRS ports in the CDM group (that is, if the channel characteristics of each port are similar, OCC (orthogonal It may be important to ensure that DMRS ports existing in the same CDM group do not have different TCI states because they are distinguished by the cover code).
- the operation of transmitting data through a plurality of TRPs as described above may be referred to as a multi-TRP (M-TRP) operation.
- M-TRP multi-TRP
- an operation of transmitting data through a plurality of cells in the plurality of TRPs may be referred to as an inter cell multi-TRP operation.
- the present disclosure proposes a method for the inter cell multi TRP operation.
- an inter-cell can be configured through inter-cell configuration information, and the inter-cell configuration information includes a unit and method for configuring an inter-cell, a unit and method for grouping cells, and a method for identifying the cell. At least one of information such as information (eg, cell id, serving cell id) may be included.
- information eg, cell id, serving cell id
- the embodiment of the present disclosure is not limited thereto, and the above-described information may not be included in the inter-cell configuration information, and any information related to the inter-cell may be included.
- SSB pattern ssb-PositionsInBurst, ssb-periodicityServingCell
- sub-carrier spacing subcarrier Spacing
- frequency absoluteFrequencySSB
- the inter-cell configuration information refers to cell configuration information for inter-cell cooperative transmission, and may also be referred to as configuration information, cell configuration information, or the like.
- the present disclosure may be applied to inter-cell multi-TRP cooperative transmission through serving cells and inter-cell multi-TRP cooperative transmission through serving cells and non-serving cells.
- 8A to 8D are diagrams illustrating scenarios of configuring multi-TRP according to an embodiment of the present disclosure.
- FIG. 8A illustrates an intra-cell multi-TRP operation 810 in which one or more TRPs operate within one serving cell configuration.
- the base station since the base station transmits settings for channels and signals transmitted in different TRPs in one serving cell configuration, several TRPs are operated based on one ServingCellIndex. Accordingly, since there is one ServingCellIndex, a cell may be configured using the same physical cell Id.
- a method of differentiating inter-cell resources in frequency-side (eg, frequency/channel/band) resources or allocating different inter-cell resources in time-side resources may be used during cell planning.
- the present disclosure proposes a method of configuring an inter-Cell for a new M-TRP based on new cell ID information or the cell-related information (or may be referred to as cooperative cell configuration information, cooperative cell-related information, etc.). That is, the present disclosure proposes a method of setting this to the terminal when a plurality of TRPs perform inter-cell cooperative transmission (that is, a method of informing the UE that cells performing inter-cell cooperative transmission are related to other TRPs). Meanwhile, a method of using a cell ID will be described below as an example, but the present disclosure is not limited thereto, and a method of using a physical cell ID, a serving cell index, or another identifier may also be considered.
- FIGS. 8A to 8D may be used for cooperative communication between base stations (inter-gNB) or between cells in a base station (inter-gNB).
- the back-haul and front-haul of FIGS. 8A to 8D may be applied to both an ideal back-haul/front-haul and a non-ideal back-haul/front-haul.
- 8A to 8D may be applied between co-channels or different channels, and may also be applied to different cell IDs or the same cell ID.
- FIG. 8c (Case 3) shows an inter-cell M-TRP operation 830 in the CA-framework.
- the base station can be configured by including settings for channels and signals transmitted in different TRPs in different serving cell settings.
- each TRP has an independent serving cell configuration
- the frequency band values FrequencyInfoDLs indicated by DownlinkConfigCommon in each serving cell configuration may indicate at least some overlapping bands. Since several TRPs operate based on multiple ServCellIndexes (ServCellIndex #1, ServCellIndex #2), it is possible to use a separate PCI for each TRP (one PCI can be assigned per ServCellIndex). In this case, when various SSBs are transmitted in TRP 1 and TRP 2, the SSBs have different PCI values (PCI #1 or PCI #2), and the UE can receive them separately.
- a method for setting cooperative transmission in a plurality of TRPs using cell configuration information is as follows.
- Method 1 Referring to Table 5 below, a method of setting information indicating activation or deactivation of intercell multi-TRP information (IntercellForMultiTRP) in SpCell configuration information (SpCellConfig) may be considered.
- IntercellForMultiTRP indicates activation or deactivation with 1-bit information or indicates activation when IntercellForMultiTRP information is included and deactivation when IntercellForMultiTRP information is not included.
- the UE may determine that the SCell or SpCell in which the IntercellForMultiTRP is set to enable (or includes IntercellForMultiTRP) is set as the cooperating set to perform cooperative transmission.
- SpCellConfig has been described as an example, the present disclosure is not limited thereto, and the same may be applied to SCell configuration information (SCellConfig).
- Method 2 Meanwhile, in consideration of another embodiment, a method of configuring the IntercellForMultiTRP using ServingCellConfig as shown in Table 6 may be considered.
- IntercellForMultiTRP indicates activation or deactivation with 1-bit information, or indicates activation when IntercellForMultiTRP information is included, and instructs deactivation when IntercellForMultiTRP information is not included. Accordingly, when IntercellForMultiTRP is set to enable in the ServingCellConfig (or when IntercellForMultiTRP is included in the ServingCellConfig), the UE can determine that the SCells or SPCells corresponding to the ServingCellConfig perform cooperative transmission.
- cooperative cell-related information may be transmitted using higher layer signaling (RRC) for inter-cell-based multiple TRP transmission.
- RRC higher layer signaling
- Cooperative cell-related information may be included in CellGroupConfig as shown in Table 7 below, for example, at least one information of inter-cell group information for Multi-TRP (hereinafter, InterCellGroupForMultiTRP) and TRP group ID (hereinafter, InterCellGroupForMultiTRPGroupID). may be added to the CellGroupConfig.
- the cooperative cell-related information may be configured by being included in the aforementioned SpCellConfig, SCellConfig, ServingCellConfig, and the like.
- the InterCellGroupForMultiTRP may be included in CellGroupConfig, and the InterCellGroupForMultiTRP may be composed of InterCellGroupForMultiTRPGroupID and InterCellGroupForMultiTRPSCellList. Accordingly, SCells included in InterCellGroupForMultiTRPSCellList are grouped by InterCellGroupForMultiTRPGroupID, and the SCells or SPCells may be used for cooperative transmission.
- InterCellGroupForMultiTRPGroupID At least one of 0 to 5 may be selected for InterCellGroupForMultiTRPGroupID.
- the InterCellGroupForMultiTRPGroupID may be set to a value of 5 or more.
- InterCellGroupForMultiTRPGroupID may be included in CellGroupConfig.
- SCells corresponding to SCellConfig included in CellGroupConfig may have the same TRP Group ID. Therefore, a cell or cell groups having the same TRP Group ID may be used for cooperative transmission. In this way, the cooperating set of the inter-cell-based M-TR can be set by using or combining the two methods, respectively.
- cooperative cell-related information may be transmitted using higher layer signaling (RRC) for inter-cell-based Multiple TRP transmission, and a set constituting a CellGroup (physical ID) #X, physical Id #Y) or (servicellId #X, servicellId #Y) can be defined in a list or table form.
- RRC higher layer signaling
- a set of physical cell IDs or a set of servingcellIDs may be configured in CellGroup, and the set may be used for cooperative transmission.
- the set of the physical cell ID or the set of servingcellID may be configured through SpCellConfig, SCellConfig, ServingCellConfig, etc. in addition to CellGroupConfig.
- FIG. 8D is a diagram illustrating an example 840 of a serving cell and PCI configuration according to a CA operation.
- the base station can set different serving cells (ServCellConfigCommon) for each cell in a CA situation in which the frequency resources occupied by each cell are different (that is, the frequency band value FrequencyInfoDL indicated by DownlinkConfigCommon in each serving cell setting is different), so you can set different indexes (ServCellIndex) for each cell and map different PCI values.
- FIG. 8B (Case 2) shows an inter-cell M-TRP operation 820 in a non-CA framework.
- settings for channels and signals transmitted in different TRPs may be included in one serving cell configuration.
- the UE may determine that inter-Cell M-TRP transmission is performed.
- the UE since it operates based on the ServCellIndex, the UE cannot check the PCI allocated to the TRP for transmitting and receiving signals through the non-serving cell. Accordingly, the UE cannot check whether inter-cell M-TRP transmission is configured. Therefore, hereinafter, a method of checking the PCI of the TRP for transmitting and receiving a signal through the non-serving cell is proposed, through which the UE can check whether the inter-cell M-TRP is configured.
- Method 1 The method of setting the SSB based on the additional PCI as the QCL reference antenna port by adding a parameter that can connect additional PCI values other than the first PCI value mapped to the existing ServCellIndex to the TCI setting or QCL setting will be used can
- a parameter for referring to another PCI in addition to the PCI allocated to the corresponding serving cell may be added to the QCL setting.
- Second method Alternatively, as shown in Table 9 below, a parameter for referring to PCI other than the PCI allocated to the corresponding serving cell may be added to the TCI setting.
- the base station can use a black cell list or a white cell list in the measurement configuration (eg, MeasConfig or MeasObject configuration).
- the base station can set a list of PCI values connected to the black list (blackCellsToAddModList) and white list (whiteCellsToAddModList) of the PCI values that the terminal considers when measuring the SSB through MeasObject configuration.
- PCI #2 is included in whiteCellsToAddModList in MeasObjectNR (or not included in blackCellsToAddModList), but PCI #3 is not included in whiteCellsToAddModList in MeasObjectNR (or included in blackCellsToAddModList), the terminal has PCI #2 You can check that it has been set. Accordingly, the UE has an obligation to measure SSB for PCI #2, but has no obligation to measure SSB for PCI #3. Therefore, the UE can apply the QCL reference antenna port setting to the SSB linked to PCI #2, but may not expect the QCL reference antenna port setting to the SSB linked to PCI #3.
- the terminal does not expect the QCL reference antenna port setting means “if it is set in this way, ignore the corresponding setting” or “the terminal operation for the setting is not defined, so random processing is performed”
- Various applications are possible, such as “allowed to do so” or “guaranteeing that the base station does not set this setting”.
- the following method may be used for the UE to check whether the inter-cell M-TRP operation is configured in FIG. 8B .
- At least one or more BWPs may be configured for TRP 1 and TRP 2, and cell-related higher layer signaling or parameters may be configured.
- a plurality of TRP(s) may be set so that the BWP corresponding to the inter-cell M-TRP is active among the BWPs supported by each TRP. Therefore, a plurality of BWPs may be active for M-TRP transmission.
- BWP-0 of TRP 1 is associated with CORESET 0, 1, 2, 3, 4
- BWP-1 of TRP 2 is CORESET 0, 1, 2, 3, It can be set to be associated with 4.
- the terminal may determine that the M-TRP operation is set. Accordingly, the terminal may perform the M-TRP operation according to the ControlResourceSet setting. That is, the terminal may transmit or receive a signal through a plurality of TRPs.
- the above-described measurement configuration information may be used to determine whether BWP-1 of TRP 2 related to the non-serving cell is in the activation state.
- BWP-1 of the TPR 2 may be activated by including at least a portion of the BWP-1 in the information.
- the measurement setting information may include frequency information (eg, ARFCN-ValueNR in freqbandindicatorNR or ssbFrequency), and when it is set to include a part of the frequency information (BWP-1) of TRP 2 in the frequency information , BWP-1 of the TRP 2 may be activated.
- the measurement configuration information may include an activated BWP or BWP ID to be used for multi-TRP inter-cell transmission, through which multi-TRP inter-cell transmission may be performed.
- the measurement configuration information received from the serving cell may include information such as a measurement object (servingCellMO) and measurement Id of the serving cell.
- the measurement configuration information received from the serving cell may include a measurement object related to a neighboring cell.
- the measurement object may include at least one of information such as BWP ID and cell ID. Accordingly, the terminal may determine that BWP 0 of TRP 1 and BWP 1 of TRP 2 are activated according to the measurement object, and may perform an M-TRP operation.
- information on CellsToAddModList may be included in the measurement object, and BWP 1 of TRP 2 may be activated by including a PCI list in the information.
- the base station transmits the BWP ID for performing multi-TRP inter-cell cooperative transmission to the terminal through configuration information such as QCL information (QCL info), or transmits the BWP ID for BWP 1 of TRP 2 to the terminal.
- QCL info QCL information
- the following method may be used for the UE to check whether the inter-cell M-TRP operation is configured in FIG. 8B .
- At least one BWP may be set for TRP 1 and TRP 2, and a method of newly setting the CORESET Index set in the terminal may be considered.
- a plurality of TRP(s) may each set one or more BWPs, where the same BWP-Id of each TRP for inter-cell M-TRP transmission may be set to be associated with a continuous (consecutive number) CORESET Index.
- the UE may be configured such that the same BWP-Id is active from TRP 1 and TRP 2. If the maximum number of CoreSET Indexes is determined to be 5, BWP-1 of TRP 1 may be set to be associated with CORESETs 0, 1, and 2, and BWP-1 of TRP 2 may be set to be associated with CORESETs 3 and 4.
- the maximum number of COREESET Index is determined to be a value of 5 or more (eg 10)
- BWP-1 of TRP 1 is associated with CORESET 0-4
- BWP-1 of TRP 2 is associated with CORESET 5-9. It can be set to be
- IntercellDownlinkBWP-Id may be added as follows to separately set the active BWP Id. Accordingly, when the BWP indicated by the IntercellDownlinkBWP-Id is activated as described above, the UE may perform the inter-cell M-TRP operation in the corresponding BWP. In case of using this method, there is an advantage of performing non-CA framework operation while maintaining the current standard in which only one BWP is active in inter-cell-based multi-TRP transmission.
- Rel-16 up to five CORESETs can be set within one BWP, and at this time, a set of CORESETs capable of performing multi-TRP transmission can be set to the same CORESETPoolIndex.
- CORESETPoolIndex it is necessary to set CORESETPoolIndex for each of a plurality of TRPs corresponding to inter-cells in Rel-17.
- the base station can set five or more CORESETs within one BWP, and can extend and use a plurality of existing CORESETPoolIndex for inter-cell-based multi-TRP transmission, and use new information (eg, CORESETPoolIndex-rel17 or CORESETPoolIndexForIntercell) can be used.
- new information eg, CORESETPoolIndex-rel17 or CORESETPoolIndexForIntercell
- FIG. 9 is a diagram illustrating a CORESETPoolIndex setting method of M-TRP based on Multi-DCI according to an embodiment of the present disclosure.
- the UE may decode DCI by monitoring a plurality of PDCCHs included in CORESET in which CORESETPoolIndex is set to the same value in at least one BWP.
- the UE can expect to receive fully/partially/non-overlapped PDSCHs scheduled by the DCI.
- the UE may monitor CORESET #X (902) of TRP 1 and CORESET Y (903) of TRP #2 set to the same CORESETPoolIndex (901) in slot #0 (904), respectively. Accordingly, the UE may receive data in PDSCH #2 905 and PDSCH #1 906 based on the DCI received through CORESET #X and CORESET #Y.
- CORESETPoolIndex may be set in the UE, and the UE may perform M-TRP operation through CORESET having the same CORESETPoolIndex. For example, if CORESETPoolIndex 0 includes CORESETs 1 and 2 and CORESETPoolIndex 1 includes CORESETs 3 and 4, the UE may perform an M-TRP operation through CORESETs 1 and 2, and CORESET 3 and 4 Through the M-TRP operation can be performed.
- a first method for setting CORESETPoolIndex will be described.
- the UE when CORESETPoolIndex is set for the serving cell, the UE can expect that the same CORESETPoolIndex is set for the inter-cell (non-serving cell). That is, the same CORESETPoolIndex may be applied even in the inter-cell. In this case, it can be determined that the inter-cell (non-serving cell) is set implicitly without a separate CORESETPoolIndex setting.
- CORESETPoolIndex 0 for the cell for TRP 1 is set to include CORESETs 1 and 2
- CORESETPoolIndex 1 is set to include CORESET 3 and 4
- the UE CORESETPoolIndex 0 for the cell for TPR2 is also CORESET 1
- CORESETPoolIndex 1 can be determined to include CORESETs 3 and 4.
- FIG. 10 is a diagram illustrating a second method of setting CORESETPoolIndex according to an embodiment of the present disclosure.
- the number of CORESETPoolIndex settings can be fixed, and the present disclosure describes a case where, for example, it is set to two.
- the embodiment of the present disclosure is not limited thereto, and the number of CORESETPoolIndex settings may be changed.
- the base station may set CORESETPoolIndex to 0 or 1 for each PCI. At this time, there may be two or more CORESETs included in CORESETPoolIndex 0 or 1.
- the base station may set at least one CORESET to be configured as a pool to have the same index for each PCI in order to set the CORESETPoolIndex between inter-cells.
- At least two CORESETs may be included in CORESETPoolIndex, and CORESETs having the same CORESETPoolIndex may be used for inter-cell cooperative transmission.
- the base station may set CORESET 1 for TRP 1 and CORESET 1 for TRP 2 as inter-cell CORESETPoolIndex 0 for a specific terminal.
- the PDCCH for multi-TRP transmission may be monitored in the inter-cell using the same CORESETIndex.
- CORESET 1 for TRP 1 and CORESET 2 for TRP 1 may be set to CORESETPoolIndex 0 (1010) for TRP 1
- CORESET 1 for TRP 2 and CORESET 3 for TRP 2 may be set to TRP 2
- CORESETPoolIndex may be set to 0 (1020). Therefore, CORESETPoolIndex 0 for TRP 1 and TRP 2 may be used for PDCCH monitoring for inter-cell multi-TRP transmission.
- CORESET 3 for TRP 1 CORESET 4 for TRP 1 may be set to CORESETPoolIndex 1 (1011) for TRP 1
- CORESET 2 for TRP 2 CORESET 4 for TRP 2 may be set to CORESETPoolIndex 1 (1021) for TRP 2 can be set to Therefore
- CORESETPoolIndex 1 for TRP 1 and TRP 2 may be used for PDCCH monitoring for inter-cell multi-TRP transmission.
- the UE may perform PDCCH monitoring for multi-TRP transmission by checking only CORESETPoolIndex regardless of PCI. In this way, the base station can set/determine so that the total number of CORESETPoolIndex is fixed and the terminal monitors all pools having the same index.
- CORESETPoolIndex information for setting CORESET ID and CORESETPoolIndex in the second method may be shown in Table 13 below.
- the case where there are two CORESETPoolIndex will be described as an example, but the number of CORESETPoolIndex may be increased, and accordingly, the number of bits of the corresponding information may also be increased.
- the UE may operate assuming that CORESETPoolIndex is 0 if there is no separate value setting in the RRC setting.
- FIG. 11 is a diagram illustrating a third method of setting CORESETPoolIndex according to an embodiment of the present disclosure.
- the number of CORESETPoolIndex settings can be fixed, and the present disclosure describes a case where, for example, it is set to two.
- the embodiment of the present disclosure is not limited thereto, and the number of CORESETPoolIndex settings may be changed.
- the base station may set CORESETPoolIndex to 0 or 1 for each PCI. At this time, there may be two or more CORESETs included in CORESETPoolIndex 0 or 1.
- the base station may set at least one CORESET to be configured as a pool to have the same index for each PCI for the inter-cell CORESETPoolIndex setting.
- CORESETs having different PCIs may be set to be included in one CORESETPoolIndex for inter-cell cooperative transmission.
- the base station may set CORESET 1 for TRP 1 and CORESET 2 for TRP 2 as inter-cell CORESETPoolIndex 0 1110 for a specific terminal.
- the base station may set CORESET 4 for TRP 1 and CORESET 3 for TRP 2 as CORESETPoolIndex 1 (1120) between inter-cells.
- the terminal does not support inter-cell-based M-TRP transmission for CORESET indexes that are not set as CORESETPoolIndex (CORESET 2 for TRP 1, CORESET 3 for TRP 2, CORESET 1 for TRP 2, CORESET 4 for TRP2) in this figure. can be judged as In this way, the base station can set/determine so that the total number of CORESETPoolIndex is fixed and the terminal monitors all pools having the same index.
- the CORESET setting according to the present embodiment may be configured as shown in Table 14 below.
- the CORESETPoolIndex-r17 field may be set to ENUMERATED ⁇ n0, n1 ⁇
- the CORESETPoolIndex-r17 field is ENUMERATED ⁇ n0, n1, n3 ⁇ can be set to
- CORESETPoolIndex may be set by dividing intra-cell and inter-cell.
- the CORESETPoolIndex-r17 field may be set to ENUMERATED ⁇ n0, n1, n3 ⁇ , and n0, n1 may be set for intra-cell and n2 may be set for inter-cell.
- CORESETPoolIndex-r17 field may also be set to information such as n4, n5, and the like.
- CORESETPoolIndex when configured by distinguishing between intra-cell and inter-cell, information on intra-cell and information on inter-cell may be determined according to a setting of a base station or a predetermined rule.
- CORESETPoolIndex may be set for intra-cell use, and CORESETPoolIndex CORESETPoolIndexFor-IntercellId (new parameter)) for inter-cell may be newly defined.
- CORESETPoolIndexForIntercellId may be set to include CORESETPoolIndex including the CORESET Id of each cell.
- CORESETPoolIndexForIntercellId 0 can be set to include CORESETPoolIndex 0 or CORESETPoolIndex 0 and CORESETPoolIndex 1 to be included.
- CORESETPoolIndexForIntercellId may be directly set to include the CORESET Id of each cell.
- the CORESETPoolIndexForIntercellId setting may be configured as shown in Table 15 below.
- FIG. 12 is a diagram illustrating a fifth method of setting CORESETPoolIndex according to an embodiment of the present disclosure.
- the fifth method proposes a method of extending the number of CORESETPoolIndex settings.
- the base station may expand the number of pools considering the entire inter-cell by the number of PCIs. For example, it is assumed that only five CORESETs that can be included in one BWP are set, and when N PCIs are set, 2*N CORESETPoolIndex can be set.
- CORESETPoolIndex 0 (1210) may include CORESET 1 for TRP 1 and CORESET 2 for TRP 1
- CORESETPoolIndex 1 (1220) is CORESET 3 for TRP 1
- CORESET 3 for TRP 2 may include
- CORESETPoolIndex 2 (1230) may include CORESET 4 for TRP 1
- CORESETPoolIndex 3 (1240) may include CORESET 1 for TRP 2
- it may be set to include CORESET 2 for TRP 2.
- the CORESETPoolIndex mapping may be set similarly.
- the UE may perform PDCCH monitoring for multi-TRP operation according to the set CORESETPoolIndex.
- FIG. 13 is a diagram illustrating an operation of a terminal according to an embodiment of the present disclosure.
- the terminal may report the terminal capability in step S1310.
- the terminal may receive the terminal capability report request from the base station and report the terminal capability accordingly.
- the terminal capability may include information on terminal capability for each RAT type.
- the terminal capability information may include information on whether the terminal supports the multi-TRP operation.
- the UE Capability may include information on whether the UE supports multi-TRP operation for inter-cell.
- not all of the above information should be included in the terminal capability information, and some information may be omitted or other information may be added.
- step S1310 may be omitted. That is, when the base station has previously received or stored the terminal capability, the terminal capability report may not be requested, and the terminal may not report the terminal capability.
- the terminal may receive multi-TRP related configuration information in step S1320.
- the Multi-TRP related configuration information may include cell related information (or cooperative cell related information) for an inter cell-based M-TRP operation, BWP related information, CORESETPoolIndex related information, and the like. Specific details are the same as described above. Accordingly, the above-described cell setting method, BWP related method, CORESETPoolIndex setting method, etc. can be applied to this embodiment.
- the UE may perform an inter-cell multi-TRP operation in step S1330. Specifically, the UE may confirm that the inter-cell multi-TRP operation is configured through the cell-related information. In addition, the UE may check information on CORESET to be monitored for a plurality of TRPs using the CORESETPoolIndex information.
- the UE may monitor the PDCCH in the CORESET for the plurality of TRPs and acquire DCI.
- the UE may receive or transmit data through the PDSCH scheduled in the DCI.
- FIG. 14 is a diagram illustrating an operation of a base station according to an embodiment of the present disclosure.
- the base station may receive the terminal capability in step S1410. Specific details are the same as described above, and thus will be omitted below. In addition, as described above, when the base station has previously received or stored the terminal capability, the terminal capability report may not be requested, and step S1410 may be omitted.
- the base station may transmit multi-TRP related configuration information in step S1420.
- the Multi-TRP-related configuration information may include cell-related information (or cooperative cell-related information), BWP-related information, CORESETPoolindex-related information, etc. for an inter cell-based M-TRP operation. Specific details are the same as described above. Accordingly, the above-described cell setting method, BWP related method, CORESETPoolIndex setting method, etc. can be applied to this embodiment.
- the base station may perform an inter-cell multi-TRP operation in step S1430. Specifically, the base station may indicate to the terminal that the inter-cell multi-TRP operation is configured through the cell-related information. In addition, the base station may inform the terminal of information on CORESET to be monitored for a plurality of TRPs using the CORESETPoolIndex information.
- the base station may transmit DCI in CORESET for the plurality of TRPs.
- the UE may receive or transmit data through the PDSCH scheduled in the DCI.
- 15 is a diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.
- the terminal may include a transceiver 1510 , a controller 1520 , and a storage 1530 .
- the controller may be defined as a circuit or an application specific integrated circuit or at least one processor.
- the transceiver 1510 may transmit/receive a signal to/from another network entity.
- the transceiver 1510 may report, for example, a terminal capability to the base station, and may receive multi-TRP configuration information from the base station.
- the controller 1520 may control the overall operation of the terminal according to the embodiment proposed in the present invention.
- the controller 1520 may control a signal flow between blocks to perform an operation according to the above-described flowchart.
- the controller 1520 may receive multi-TRP configuration information according to an embodiment of the present invention, and may confirm that an inter-cell multi-TRP operation is configured based thereon.
- the controller 1520 may check the CORESETPoolIndex according to the multi-TRP setting information. Accordingly, the controller 1520 may monitor the CORESET of a plurality of TRPs based on the CORESETPoolIndex.
- the controller 1520 may transmit/receive data based on the received DCI. Since the specific content is the same as described above, it will be omitted below.
- the storage unit 1530 may store at least one of information transmitted and received through the transceiver 1510 and information generated through the control unit 1520 .
- 16 is a diagram illustrating a structure of a base station according to an embodiment of the present disclosure.
- the base station may include a transceiver 1610 , a controller 1620 , and a storage 1630 .
- the controller may be defined as a circuit or an application specific integrated circuit or at least one processor.
- the transceiver 1610 may transmit/receive signals to and from other network entities.
- the transceiver 1610 may receive, for example, a terminal capability from the terminal, and may transmit multi-TRP configuration information to the terminal.
- the controller 1620 may control the overall operation of the base station according to the embodiment proposed in the present invention. For example, the controller 1620 may control a signal flow between blocks to perform an operation according to the above-described flowchart. For example, the controller 1620 may transmit multi-TRP configuration information according to an embodiment of the present invention, and may notify the terminal that the inter-cell multi-TRP operation is configured through the information. Also, the controller 1620 may transmit CORESETPoolIndex to the terminal according to the multi-TRP configuration information. Accordingly, the controller 1620 may transmit DCI through CORESETs of a plurality of TRPs based on the CORESETPoolIndex. Also, the controller 1620 may transmit/receive data through a PDSCH scheduled based on DCI. Since the specific content is the same as described above, it will be omitted below.
- the storage unit 1630 may store at least one of information transmitted/received through the transceiver 1610 and information generated through the control unit 1620 .
- the method comprising: receiving configuration information related to a multi-transmission reception point (TRP); checking whether inter-cell multi-TRP transmission is configured based on the configuration information; when the inter-cell multi-TRP transmission is configured, checking a control resource set (CORESET) for multi-TRP based on the configuration information; receiving downlink control information (DCI) for the multi-TRP through the CORESET; and receiving data from the multi-TRP based on the DCI.
- TRP multi-transmission reception point
- CORESET control resource set
- DCI downlink control information
- the method comprising: transmitting configuration information related to a multi-transmission reception point (TRP); When inter-cell multi-TRP transmission is configured, downlink control information for the multi-TRP through CORESET (control resource set) for multi-TRP based on the configuration information (downlink control information: DCI) ) to transmit; and transmitting data through the multi-TRP based on the DCI.
- TRP multi-transmission reception point
- a transceiver in a terminal in a wireless communication system, a transceiver; and receives configuration information related to a multi-TRP (transmission reception point) through the transceiver, checks whether inter-cell multi-TRP transmission is configured based on the configuration information, and cell) when multi-TRP transmission is set, check CORESET (control resource set) for multi-TRP based on the configuration information, and downlink control information for multi-TRP through the CORESET through the transceiver ( downlink control information: DCI), and a controller configured to receive data from the multi-TRP based on the DCI through the transceiver.
- a multi-TRP transmission reception point
- DCI downlink control information
- a control unit that transmits downlink control information (DCI) for the multi-TRP through the resource set) through the transceiver, and transmits data through the multi-TRP based on the DCI through the transceiver It is characterized in that it includes.
- DCI downlink control information
- a method of a terminal in a wireless communication system comprising: receiving configuration information related to cooperative transmission from a serving cell of a base station; checking whether cooperative transmission between the serving cell and a non-serving cell is configured based on the configuration information; If the cooperative transmission is set, checking a CORESET (control resource set) for cooperative transmission based on the setting information; Receiving downlink control information (DCI) for the cooperative transmission through the CORESET; and receiving data from the serving cell and the non-serving cell based on the DCI.
- DCI downlink control information
- the method of the present invention may be implemented in a combination of some or all of the contents contained in each embodiment within a range that does not impair the essence of the invention.
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Abstract
Description
설정정보 1 | 대역폭 부분의 대역폭 (대역폭 부분을 구성하는 PRB 수) |
설정정보 2 | 대역폭 부분의 주파수 위치(이러한 정보로 기준점(A Reference Point) 대비 오프셋(Offset) 값, 기준점은 예컨대 반송파의 중심 주파수, 동기 신호, 동기 신호 래스터(Raster) 등이 있을 수 있다) |
설정정보 3 | 대역폭 부분의 뉴머롤로지 (Numerology) (예컨대, 부반송파 (Subcarrier) 간격, CP (Cyclic Prefix) 길이 등) |
그 외 |
지시자 값 | 대역폭 부분 설정 |
00 | 상위 계층 시그널링으로 설정된 대역폭 설정 A |
01 | 상위 계층 시그널링으로 설정된 대역폭 설정 B |
10 | 상위 계층 시그널링으로 설정된 대역폭 설정 C |
11 | 상위 계층 시그널링으로 설정된 대역폭 설정 D |
Claims (15)
- 무선 통신 시스템에서 단말의 방법에 있어서,multi-TRP (transmission reception point)와 관련된 설정 정보를 수신하는 단계;상기 설정 정보에 기반하여 셀 간 (inter-cell) multi-TRP 전송이 설정되었는지 확인하는 단계;상기 셀 간 (inter-cell) multi-TRP 전송이 설정된 경우, 상기 설정 정보에 기반하여 multi-TRP에 대한 CORESET (control resource set)을 확인하는 단계;상기 CORESET을 통해 상기 multi-TRP에 대한 하향링크 제어 정보 (downlink control information: DCI)를 수신하는 단계; 및상기 DCI에 기반하여 상기 multi-TRP로부터 데이터를 수신하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 설정 정보는 서빙 셀 설정 정보를 포함하고,상기 서빙 셀 설정 정보에 포함된 셀 간 (inter-cell) multi-TRP 정보가 활성화된 경우 또는 상기 multi-TRP에 대한 inter-cell 그룹 정보가 포함된 경우, 상기 셀 간 multi-TRP 전송이 설정되며,상기 설정 정보에 포함된 대역폭부분 (bandwidth part: BWP)이 적어도 두 개 이상 활성화된 경우 상기 셀 간 multi-TRP 전송이 설정되며,상기 multi-TRP에 대한 inter-cell 그룹 정보는 셀 그룹 식별자 및 셀 리스트를 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 설정 정보에 포함된 서빙 셀 설정 정보에 셀 간 (inter-cell) multi-TRP를 위한 BWP 정보가 포함되는 경우 상기 BWP 정보에 의해 지시된 BWP에서 상기 셀 간 multi-TRP 전송이 설정되며,상기 BWP 정보는 BWP 식별자를 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 기지국으로부터 단말 능력 정보 요청을 수신하는 단계; 및상기 셀 간 multi-TRP 전송을 지원하는지 여부를 지시하는 정보를 포함한 단말 능력 정보를 상기 기지국에 전송하는 단계를 더 포함하고,상기 설정 정보는 CORESET 설정 정보를 포함하고,상기 CORESET을 확인하는 단계는,상기 CORESET 설정 정보에 포함된 CORESET 풀 지시자를 확인하는 단계;상기 CORESET 풀 지시자가 동일한 CORESET을 통해 상기 multi-TRP에 대한 DCI를 수신하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 무선 통신 시스템에서 기지국의 방법에 있어서,multi-TRP (transmission reception point)와 관련된 설정 정보를 전송하는 단계;셀 간 (inter-cell) multi-TRP 전송이 설정된 경우, 상기 설정 정보에 기반하여 multi-TRP에 대한 CORESET (control resource set)를 통해 상기 multi-TRP에 대한 하향링크 제어 정보 (downlink control information: DCI)를 전송하는 단계; 및상기 DCI에 기반하여 상기 multi-TRP를 통해 데이터를 전송하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 설정 정보는 서빙 셀 설정 정보를 포함하고,상기 서빙 셀 설정 정보에 포함된 셀 간 (inter-cell) multi-TRP 정보가 활성화된 경우 또는 상기 multi-TRP에 대한 inter-cell 그룹 정보가 포함된 경우, 상기 셀 간 multi-TRP 전송이 설정되며,상기 설정 정보에 포함된 대역폭부분 (bandwidth part: BWP)이 적어도 두 개 이상 활성화된 경우 상기 셀 간 multi-TRP 전송이 설정되며,상기 multi-TRP에 대한 inter-cell 그룹 정보는 셀 그룹 식별자 및 셀 리스트를 포함하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 단말에 단말 능력 정보 요청을 전송하는 단계; 및상기 셀 간 multi-TRP 전송을 지원하는지 여부를 지시하는 정보를 포함한 단말 능력 정보를 상기 단말로부터 수신하는 단계를 더 포함하고,상기 설정 정보는 CORESET 설정 정보를 포함하고,상기 DCI를 전송하는 단계는,상기 CORESET 설정 정보에 포함된 CORESET 풀 지시자가 동일한 CORESET을 통해 상기 multi-TRP에 대한 DCI를 전송하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 무선 통신 시스템에서 단말에 있어서,송수신부; 및상기 송수신부를 통해 multi-TRP (transmission reception point)와 관련된 설정 정보를 수신하고,상기 설정 정보에 기반하여 셀 간 (inter-cell) multi-TRP 전송이 설정되었는지 확인하고,상기 셀 간 (inter-cell) multi-TRP 전송이 설정된 경우, 상기 설정 정보에 기반하여 multi-TRP에 대한 CORESET (control resource set)을 확인하고,상기 송수신부를 통해 상기 CORESET을 통해 상기 multi-TRP에 대한 하향링크 제어 정보 (downlink control information: DCI)를 수신하고,상기 송수신부를 통해 상기 DCI에 기반하여 상기 multi-TRP로부터 데이터를 수신하는 제어부를 포함하는 것을 특징으로 하는 단말.
- 제8항에 있어서,상기 설정 정보는 서빙 셀 설정 정보를 포함하고,상기 서빙 셀 설정 정보에 포함된 셀 간 (inter-cell) multi-TRP 정보가 활성화된 경우 또는 상기 multi-TRP에 대한 inter-cell 그룹 정보가 포함된 경우, 상기 셀 간 multi-TRP 전송이 설정되며,상기 설정 정보에 포함된 대역폭부분 (bandwidth part: BWP)이 적어도 두 개 이상 활성화된 경우 상기 셀 간 multi-TRP 전송이 설정되며,상기 multi-TRP에 대한 inter-cell 그룹 정보는 셀 그룹 식별자 및 셀 리스트를 포함하는 것을 특징으로 하는 단말.
- 제8항에 있어서,상기 설정 정보에 포함된 서빙 셀 설정 정보에 셀 간 (inter-cell) multi-TRP를 위한 BWP 정보가 포함되는 경우 상기 BWP 정보에 의해 지시된 BWP에서 상기 셀 간 multi-TRP 전송이 설정되며,상기 BWP 정보는 BWP 식별자를 포함하는 것을 특징으로 하는 단말.
- 제8항에 있어서,상기 제어부는,상기 송수신부를 통해 상기 기지국으로부터 단말 능력 정보 요청을 수신하고,상기 송수신부를 통해 상기 셀 간 multi-TRP 전송을 지원하는지 여부를 지시하는 정보를 포함한 단말 능력 정보를 상기 기지국에 전송하고,상기 설정 정보는 CORESET 설정 정보를 포함하고,상기 제어부는, 상기 CORESET을 확인하기 위해,상기 CORESET 설정 정보에 포함된 CORESET 풀 지시자를 확인하고,상기 송수신부를 통해 상기 CORESET 풀 지시자가 동일한 CORESET을 통해 상기 multi-TRP에 대한 DCI를 수신하는 제어부를 더 포함하는 것을 특징으로 하는 단말.
- 무선 통신 시스템에서 기지국에 있어서,송수신부; 및상기 송수신부를 통해 multi-TRP (transmission reception point)와 관련된 설정 정보를 전송하고,셀 간 (inter-cell) multi-TRP 전송이 설정된 경우, 상기 설정 정보에 기반하여 multi-TRP에 대한 CORESET (control resource set)를 통해 상기 multi-TRP에 대한 하향링크 제어 정보 (downlink control information: DCI)를 상기 송수신부를 통해 전송하고,상기 송수신부를 통해 상기 DCI에 기반하여 상기 multi-TRP를 통해 데이터를 전송하는 제어부를 포함하는 것을 특징으로 하는 기지국.
- 제12항에 있어서,상기 설정 정보는 서빙 셀 설정 정보를 포함하고,상기 서빙 셀 설정 정보에 포함된 셀 간 (inter-cell) multi-TRP 정보가 활성화된 경우 또는 상기 multi-TRP에 대한 inter-cell 그룹 정보가 포함된 경우, 상기 셀 간 multi-TRP 전송이 설정되며,상기 설정 정보에 포함된 대역폭부분 (bandwidthp art: BWP)이 적어도 두 개 이상 활성화된 경우 상기 셀 간 multi-TRP 전송이 설정되며,상기 multi-TRP에 대한 inter-cell 그룹 정보는 셀 그룹 식별자 및 셀 리스트를 포함하는 것을 특징으로 하는 기지국.
- 제12항에 있어서,상기 설정 정보에 포함된 서빙 셀 설정 정보에 셀 간 (inter-cell) multi-TRP를 위한 BWP 정보가 포함되는 경우 상기 BWP 정보에 의해 지시된 BWP에서 상기 셀 간 multi-TRP 전송이 설정되며,상기 BWP 정보는 BWP 식별자를 포함하는 것을 특징으로 하는 기지국.
- 제12항에 있어서,상기 설정 정보는 CORESET 설정 정보를 포함하고,상기 제어부는,상기 송수신부를 통해 상기 CORESET 설정 정보에 포함된 CORESET 풀 지시자가 동일한 CORESET을 통해 상기 multi-TRP에 대한 DCI를 전송하며,상기 송수신부를 통해 상기 단말에 단말 능력 정보 요청을 전송하고,상기 송수신부를 통해 상기 셀 간 multi-TRP 전송을 지원하는지 여부를 지시하는 정보를 포함한 단말 능력 정보를 상기 단말로부터 수신하는 것을 특징으로 하는 기지국.
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FUTUREWEI: "Inter-cell multi-TRP operation", 3GPP DRAFT; R1-2005286, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20200817 - 20200828, 7 August 2020 (2020-08-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051917332 * |
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