WO2022239362A1 - 基地局、通信装置及び通信方法 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Definitions
- the present disclosure relates to base stations, communication devices, and communication methods.
- a service called local 5G or private 5G is known as a cellular communication service that is performed in limited areas such as factories, offices, studios, hospitals, and universities. This service is sometimes called a non-public network.
- This service is sometimes called a non-public network.
- By limiting the service area to a local area there is an advantage that customized cellular service can be provided.
- Wi-Fi communication and communication based on standards such as 802.11a, b, g, n, and ac have been used for local area communication.
- Communication such as Wi-Fi has the advantage of good performance, but since the access point does not have a scheduler that adjusts resources among different users, LBT (Listen Before Talk) is a contention-based method based on carrier sense. In a way the traffic between users is multiplexed. User packets collide frequently. Therefore, when there are a plurality of users, there is a demand to use cellular communication even in local areas because cellular communication can maintain quality.
- LBT Listen Before Talk
- 5G base stations can perform beamforming.
- beamforming a desired beam is determined between a base station and a terminal by a procedure called beam management, and data is transmitted using that beam.
- beamforming interference control is performed so that beams provided by adjacent base stations do not interfere with each other.
- interference control may become difficult due to various factors such as the positional relationship between the base station and the terminal, the direction and beam width of the beam generated by the base station, and the like. Since very important communications exist in local area communications, communications that maintain quality are required even when beamforming is used.
- the present disclosure provides a base station, communication device, and communication method that realize high-quality communication between the base station and communication device.
- a base station of the present disclosure includes a transmission unit that transmits configuration information that instructs to measure received power of a first reference signal for interference measurement transmitted on a plurality of first resources; and a receiving unit that receives first report information including information specifying a second resource whose received power is equal to or lower than a threshold or is relatively low.
- the communication method of the present disclosure transmits configuration information that instructs to measure received power of a first reference signal for interference measurement transmitted on a plurality of first resources, and among the plurality of first resources, the First reporting information is received that includes information identifying a second resource whose received power is below a threshold or relatively low.
- a communication apparatus includes a receiving unit that receives setting information that instructs to measure received power of a first reference signal for interference measurement transmitted on a plurality of first resources, and and a control unit that measures the received power of the first reference signal, and detects a second resource whose received power is below a threshold or relatively low among the plurality of first resources, and identifies the second resource.
- a transmitting unit configured to transmit first report information including the information;
- the communication method of the present disclosure receives configuration information for instructing measurement of received power of a first reference signal for interference measurement transmitted on a plurality of first resources, Measure the received power of one reference signal, detect a second resource whose received power is below a threshold or relatively low among the plurality of first resources, and include information identifying the second resource Send information.
- FIG. 1 is a block diagram showing an example of a base station according to an embodiment of the present disclosure
- FIG. 1 is a block diagram showing an example of a terminal according to an embodiment of the present disclosure
- FIG. 10 is a diagram schematically showing an operation example of a base station and a terminal in specific example 1
- FIG. 4 is a diagram schematically showing an example of detecting an interference beam having a received power value equal to or less than a threshold
- FIG. 10 is a diagram showing an example of a specification of a terminal operation method in specific example 1;
- FIG. 4 is a diagram schematically showing an example of detecting an interference beam having a received power value equal to or lower than a threshold value lower than the received power value of a desired beam by a certain value ⁇ D;
- FIG. 11 is a diagram showing an example of a specification of a terminal operation method in specific example 2;
- FIG. 11 is a sequence diagram showing an example of procedures performed between a base station and a terminal in specific example 2;
- FIG. 11 is a diagram schematically showing the correspondence relationship between a beam that a base station may select as a desired beam and a reception beam that a terminal uses to receive the beam in the second embodiment;
- FIG. 11 is a diagram showing a setting example of a report configuration for terminal-side beam status according to the second embodiment;
- FIG. 11 is a diagram showing an example of resource configuration settings for low-interference beams according to the second embodiment;
- FIG. 10 is a sequence diagram showing an example of procedures performed between a base station and a terminal according to the second embodiment;
- beams e.g., reference signals with directivity (e.g., CSI-RS)
- beam management can be performed by performing a procedure called beam management between 5G base stations and terminals. can be done with the terminal.
- beam may also mean a directional reference signal (e.g., CSI-RS) or simply a reference signal (e.g., CSI-RS).
- FIG. 1 is a sequence diagram showing an example of beam management procedures.
- FIG. 2 is a diagram schematically showing beam sweeping performed in a beam management procedure.
- the base station 1000 sequentially transmits a plurality of beams by beam sweeping (S101), and receives a beam measurement result report (for example, a measurement report including a desired beam to be used) from the terminal 2000 (S102). ).
- the base station 1000 transmits a reference signal for communication quality measurement with the desired beam to the terminal 2000 (S103).
- the base station 1000 receives a report indicating beam channel quality (communication quality) from the terminal 2000 (S104).
- the base station 1000 determines parameters such as modulation scheme and coding scheme based on the channel quality, and transmits data (user data) to the terminal 2000 using the determined beam (S105).
- FIG. 3 shows an example in which the tilting between the base station 1000A and the terminal 2000A and the tilting between the base station 1000B adjacent to the base station 1000A and the terminal 2000B are large.
- FIG. 4 shows an example in which the tilting between the base station 1000A and the terminal 2000A and the tilting between the base station 1000B adjacent to the base station 1000A and the terminal 2000B are small.
- interference between adjacent cells may increase.
- a beam is used for communication between a base station and a terminal, not only the distance between the base station and the terminal but also the direction of the beam affects the amount of interference to the terminal. For example, using a narrow beam width beam does not disperse the energy, so the signal in the beam may reach other terminals farther away than the terminal. Therefore, the direction of the beam, rather than the distance from the base station, has a greater bearing on whether or not interference occurs, which makes interference control difficult.
- the terminal 2000 monitors (measures the received power) the beams swept by the base station 1000, so that the terminal 2000 selects a desired beam and receives information on the selected beam (e.g., The corresponding reference signal identifier (e.g., CRI)) can be reported to the base station 1000 (see S102 in FIG. 1).
- Desirable beams are, for example, beams with high received power on the terminal side.
- the 3GPP Rel16 MIMO work item states that the amount of interference (L1-SINR) between the desired beam for the terminal and the beam measured while the terminal is receiving the desired beam can be reported to the base station.
- L1-SINR amount of interference
- Figure 5 is an excerpt from 3GPP Rel16 38.214 Section 5.2.1. A measurement of L1-SINR is described.
- the terminal When measuring L1-SINR, the terminal receives the beam from the interfering base station (interfering beam) using the same receiving beam as when receiving the desired beam from the base station.
- the terminal measures the received power of the desired beam (desired power) and the received power of the interference beam (interference power).
- SINR Signal to Interference and Noise Ratio
- SINR is calculated from the desired power and interference power, and the calculated SINR (L1-SINR) is reported to the base station. Reporting is based on beam report configuration settings.
- Figure 6 shows an excerpt of the report configuration in Rel16 TS38.331 Section 6.3.2. Based on the report configuration, the terminal monitors (measures the received power) multiple resources set by frequency and time, and the settings for reporting the monitoring results are sent from the base station to the terminal in advance. is performed on More details are as follows.
- the Resource Configuration ID for channel measurement indicates which resource configuration to monitor to acquire the received power of the candidate beams (candidate beams) used for communication with the terminal.
- the Resource Configuration ID for interference measurement indicates which resource configuration to monitor to obtain the amount of interference with the interference beam (SINR).
- Resource configuration for Report indicates which Uplink Resource to use to report to the base station.
- CRI-SINR is set as the content to be reported to the base station.
- CRI-SINR means reporting the ID of a resource in which a desired beam desired by a terminal among candidate beams is transmitted, and the amount of interference (SINR) between the desired beam and an interference beam.
- SINR the amount of interference
- Resource Configuration ID is the same for channel measurement and interference measurement. Note that both measurements specify different resources.
- FIG. 7 shows an excerpt of the Resource configuration settings in Rel16 TS38.331 Section 6.3.2.
- the Reference Signal Resource Set List includes a plurality of RS Resource Sets (Reference Signal Resource Sets) configured with resources of a plurality of DL RSs (Downlink Reference Signals). That is, the list includes a set of resources to which reference signals are transmitted.
- the BWP ID indicates which BWP (Bandwidth Part) to use. In other words, it indicates which BWP the above resource belongs to.
- a BWP is each part obtained by dividing a component carrier, which is a frequency band, into partial frequency domains.
- the terminal calculates the SINR for the desired beam and reports the calculated SINR to the base station.
- the desired reference signal ( Information on the resource on which the RS) was transmitted (e.g., on the resource on which the desired beam was transmitted, the identifier of the reference signal corresponding to the desired beam (e.g., CRI)) is reported together with the SINR. It was not done by monitoring reference signals (RS) placed in multiple cells (Component Carriers) or multiple BWPs.
- Reference Signals Reference Signals
- Component Carriers Component Carriers
- a base station when a base station uses a specific beam (desired beam), it has information (for example, SINR) of the beam that interferes with the specific beam. Only.
- the base station has at least no information about beams that do not interfere with a specific beam (beams that are unlikely to interfere or that give little interference) when using a specific beam.
- a base station uses a specific beam, if the base station or other neighboring base stations can grasp a lot of information about beams that do not interfere with that beam, the base station or other neighboring base stations can , a beam that does not interfere with that particular beam can be used.
- the base station where the specific beam exists can It is also possible to request a station not to emit an interfering beam.
- the current standard does not disclose how to obtain information about beams that do not interfere with a particular beam.
- the embodiment of the present disclosure realizes that the base station acquires information on beam groups with weak interference with a specific beam.
- FIG. 8 is a diagram schematically showing an example of a communication system according to an embodiment of the present disclosure.
- the communication system of FIG. 8 includes base stations 101 and 102, a terminal 201 (communication device), a core network (Core Network) 300, and a packet data network (PDN: Packet Data Network) 400.
- a terminal 201 is a communication device within a cell (coverage) operated by the base station 101 .
- the base stations 101 and 102 are connected to each other by wire or wirelessly, and can transmit and receive information using a predetermined interface such as the X2 interface. Although two base stations are shown in FIG. 8, three or more base stations may be arranged so that information can be transmitted and received between them. Also, although one terminal is shown, two or more terminals (communication devices) belonging to the base station 101 or 102 may be arranged.
- the communication system in FIG. 8 is, for example, a cellular communication system such as W-CDMA (Wideband Code Division Multiple Access), cdma2000 (Code Division Multiple Access 2000), LTE, and NR.
- LTE shall include LTEA (LTE-Advanced), LTE-A Pro (LTE-Advanced Pro), and EUTRA (Evolved Universal Terrestrial Radio Access).
- NR shall include NRAT (New Radio Access Technology) and FEUTRA (Further EUTRA).
- the communication system is assumed to be an NR cellular communication system.
- NR is the radio access technology (RAT) of the next generation (5th generation) of LTE.
- RAT radio access technology
- NR is a radio access technology that can support various use cases including eMBB (Enhanced Mobile Broadband), mMTC (Massive Machine Type Communications) and URLLC (Ultra-Reliable and Low Latency Communications).
- eMBB Enhanced Mobile Broadband
- mMTC Massive Machine Type Communications
- URLLC Ultra-Reliable and Low Latency Communications
- a communication system is not limited to a cellular communication system.
- the communication system may be other wireless communication systems such as a wireless LAN (Local Area Network) system, a television broadcasting system, an aircraft radio system, a space radio communication system, and the like.
- the base stations 101 and 102 are communication devices that operate cells and provide wireless services to one or more terminals located within the coverage of the cells.
- a cell may be operated according to any radio communication scheme, such as NR.
- Base stations 101 and 102 are connected to core network 300 .
- Core network 300 is connected to PDN 400 .
- a base station 101, 102 may be configured to manage multiple cells.
- the base stations 101 and 102 are 5G base stations and correspond to gNBs.
- the base stations 101 and 102 may be referred to as a combination of gNB CU (Central Unit) and gNB DU (Distributed Unit) or any of these.
- the base stations 101 and 102 may be configured to be able to wirelessly communicate with other base stations.
- the devices may be connected via an X2 interface.
- the plurality of base stations 101 and 102 are eNBs or a combination of eNBs and gNBs
- the devices may be connected via an Xn interface.
- the devices may be connected via an F1 interface. All or at least some of the messages/information described below may be communicated between multiple base stations 101, 102 (eg, via X2, Xn, F1 interfaces).
- the base stations 101 and 102 may consist of a set of multiple physical or logical devices.
- the base stations 101 and 102 may be classified into a plurality of devices of BBU (Baseband Unit) and RU (Radio Unit), and interpreted as an aggregate of these plurality of devices.
- the base stations 101, 102 may be either or both BBUs and RUs in embodiments of the present disclosure.
- the BBU and RU may be connected by a predetermined interface (e.g. eCPRI).
- the RU may be referred to as RRU (Remote Radio Unit) or RD (Radio DoT).
- an RU may correspond to a gNB DU as described above or below.
- a BBU may correspond to a gNB CU as described above or below.
- the RU may be a unit integrally formed with the antenna.
- the antennas possessed by the base stations 101 and 102 may adopt an Advanced Antenna System and support MIMO (for example, FD-MIMO) and beamforming.
- the antennas of the base stations 101 and 102 (for example, antennas integrally formed with the RU) have, for example, 64 transmitting antenna ports and 64 receiving antenna ports. may be provided.
- the base stations 101 and 102 When the base stations 101 and 102 support beamforming, the base stations 101 and 102 transmit signals by performing beam sweeping, for example, in the circumferential and radial directions of the cell.
- the direction of beam sweeping is not limited to the horizontal direction, and may be any direction in the vertical direction or a combination of the horizontal and vertical directions. That is, when multiple antenna elements of an antenna that performs beamforming are arranged in the horizontal direction and the vertical direction with respect to the antenna plane, the antenna settings (e.g., antenna tilt angle, distance between antenna elements (elements), wavelength , phase offset, and reference transmission power), the beam can be directed and controlled in the horizontal and vertical directions.
- the core network 300 is an NR core network (5G Core (5GC)), and includes AMF (Access and Mobility Management Function), SMF (Session Management Function), UPF (User Plane Function), PCF (Policy Control Function) and UDM ( Unified Data Management).
- AMF Access and Mobility Management Function
- SMF Session Management Function
- UPF User Plane Function
- PCF Policy Control Function
- UDM Unified Data Management
- the terminal 201 is a communication device that wirelessly communicates with other devices.
- the terminal 201 is, for example, a sensor or camera device having a communication function, a mobile phone, a smart device (smartphone or tablet), a PDA (Personal Digital Assistant), or a personal computer.
- the terminal 201 may be a head-mounted display, VR goggles, or the like that has a function of wirelessly transmitting and receiving data.
- a terminal 201 is a 5G terminal and corresponds to a UE.
- the communication system of the present embodiment is an NR cellular communication system
- the communication system may be applied not only to 5G NR Standalone, but also to 3GPP 5G NR Non-Standalone.
- a cell provided by base stations 101 and 102 is called a serving cell.
- Serving cells include PCell (Primary Cell) and SCell (Secondary Cell). Dual Connectivity (e.g. EUTRA-EUTRA Dual Connectivity, EUTRA-NR Dual Connectivity (ENDC), EUTRA-NR Dual Connectivity with 5GC, NR-EUTRA Dual Connectivity (NEDC), NR-NR Dual Connectivity) to UE (e.g. Terminal 201)
- the PCell and zero or more SCell(s) provided by the MN (Master Node) are called a Master Cell Group.
- the Serving cell may include a PS Cell (Primary Secondary Cell or Primary SCG Cell).
- the PSCell and zero or more SCell(s) provided by the SN are called a Secondary Cell Group (SCG).
- SCG Secondary Cell Group
- PUCCH physical uplink control channel
- the physical uplink control channel (PUCCH) is transmitted on PCell and PSCell, but not on SCell. Radio Link Failure is also detected in PCell and PSCell, but not detected in SCell (it does not have to be detected).
- PUCCH Physical uplink control channel
- SCells Special Cells
- One cell may be associated with one Downlink Component Carrier and one Uplink Component Carrier.
- the system bandwidth corresponding to one cell may be divided into a plurality of bandwidth parts (Bandwidth Parts).
- Bandwidth Parts may be set for the UE, and one Bandwidth Part may be used for the UE as an Active BWP.
- the radio resources for example, frequency band, numerology (subcarrier spacing), slot format (Slot configuration)
- the terminal device 10 may differ for each cell, each component carrier, or each BWP.
- the base stations 101 and 102 in the above-described first and second embodiments and modifications may be MN or SN of NR-NR DC as 3GPP 5G NR Standalone, or 3GPP 5G NR Non-Standalone as ENDC, ENDC with 5GC, or gNB (en-gNB) in NEDC.
- FIG. 9 is a block diagram illustrating an example of base station 101 according to an embodiment of the present disclosure.
- Base station 101 includes antenna 110 , radio communication section 120 , network communication section 130 , storage section 140 and control section 150 . It is assumed that the base station 102 has normal gNB functions in 5G and also has a function to operate according to instructions from the base station 101 according to the present embodiment. Base station 102 may have the same configuration as base station 101 .
- the wireless communication unit 120, the network communication unit 130, and the control unit 150 are, for example, a CPU (Central Processing Unit), a processor (hardware processor) such as an MPU (Micro-Processing Unit), an ASIC (Application Specific Integrated Circuit), or an FPGA. (Field-Programmable Gate Array) or other integrated circuits.
- the storage unit 140 is realized by any recording medium such as memory, hard disk device, optical disk, or magnetic recording device.
- the memory may be volatile memory or non-volatile memory.
- the antenna 110 radiates the signal output by the wireless communication unit 120 into space as radio waves.
- Antenna 110 also converts radio waves in space into a signal and outputs the signal to wireless communication section 120 .
- Antenna 110 may have multiple antenna elements to form a beam.
- the wireless communication unit 120 transmits and receives signals.
- a signal contains data or information.
- the wireless communication unit 120 includes a signal transmission unit 121 that transmits signals and a signal reception unit 122 that receives signals.
- the signal transmitter 121 transmits downlink signals to the terminal 201 and the signal receiver 122 receives uplink signals from the terminal 201 .
- the wireless communication unit 120 can form one or more beams (transmission beams) using the antenna 110 and beam-transmit a signal to the terminal 201 .
- a transmit beam is formed based on a transmit beam filter, which is sometimes also called a transmit spatial filter (TX spatial filter).
- TX spatial filter transmit spatial filter
- Signal transmission by the signal transmission unit 121 includes both beam transmission and non-beam transmission (omni transmission).
- the network communication unit 130 transmits and receives information. For example, network communication unit 130 transmits information to other nodes and receives information from other nodes. Other nodes include, for example, base stations 102 and/or core network nodes.
- the storage unit 140 temporarily or permanently stores programs and data for operating the base station 101 .
- the control unit 150 includes a receiving unit 152 and a transmitting unit 151.
- the receiving unit 152 receives a signal including data or information from the terminal 201 via the wireless communication unit 120 or the signal receiving unit 122 .
- the transmission unit 151 transmits a signal including data or information to the terminal 201 via the wireless communication unit 120 or the signal transmission unit 121 .
- the control unit 150 controls the operation of the entire base station 101 and provides various functions of the base station 101 .
- the control unit 150 may cause the terminal to measure received power for a plurality of candidate beams (candidate beams). For example, the control unit 150 transmits a reference signal for quality measurement using each different resource (that is, each resource has the same frequency but a different time) using each candidate beam by beam sweeping described in the background art, and the terminal 201 measure the received power of the reference signal transmitted by each candidate beam. For example, control section 150 may receive information designating a candidate beam with the highest received power value from terminal 201 as the desired beam, and may decide to use the desired beam for data transmission to terminal 201 .
- Control section 150 may transmit a reference signal for quality measurement to a terminal using a desired beam, and cause the terminal to measure channel state information (CSI).
- the control unit 150 may acquire channel state information (CSI: Channel Sate Information) and determine parameters such as a modulation scheme and an encoding scheme.
- control section 150 can measure and feed back the CSI for each of a plurality of beam candidates to the terminal, and determine the desired beam to be used for transmission to terminal 201 based on the CSI of each beam candidate.
- the received power of the reference signal or CSI is an example of information representing the communication quality of the beam.
- the desired beam determination method described in this paragraph is an example, and other methods are also possible.
- the control unit 150 controls a plurality of reference signals for interference measurement (first reference signal) for transmitting interference beams (first beams).
- resource (first resource).
- a resource is a resource specified by frequency and time. As an example, the multiple resources have the same frequency and different times.
- the control unit 150 or the transmission unit 151 measures the received power of the reference signal transmitted by the determined multiple resources (that is, the received power of the interference beam), and information specifying the resource for which the received power value below the threshold is measured. is reported (feedback) to the base station 101 .
- the control unit 150 or the transmission unit 151 transmits to the terminal 201 report setting information (setting information) that instructs a plurality of resources to be measured and the above-mentioned threshold values to be compared with received power.
- the threshold may be set in the terminal 201 in advance, and in this case, the report setting information does not need to specify the threshold.
- An upper limit value (N) may be provided for the number of resources to be reported by terminal 201 . N is an integer of 1 or more. In this case, information specifying the upper limit (N) may be included in the report setting information.
- the information that identifies the resource is, for example, the ID of the resource.
- the information identifying the resource may be the ID of the interfering beam transmitted on that resource.
- the information specifying the resource may be the ID of the reference signal.
- the resource ID, interference beam ID, or reference signal ID may be included in a channel within the same slot (or frame) as the reference signal, or may be included in the reference signal.
- the base station that transmits the reference signal for interference measurement can be either the base station 101, the base station 102, or both.
- the control unit 150 of the base station 101 controls one or more resources that cause the base station 102 to transmit the reference signal for interference measurement, and an interference beam that is transmitted using the resource. (ie, the filters that generate the interfering beams) to the base station 102 .
- the threshold may be specified by the absolute value of power.
- the threshold may be relatively specified by the following method. That is, the terminal transmits a reference signal (second reference signal) for quality measurement using a beam (for example, a desired beam or a second beam). A value determined relative to the received power value of the reference signal in the terminal is set as the threshold. For example, a value lower than the received power value by a constant value (difference value ⁇ D) is set as the threshold. Alternatively, a reference signal (second reference signal) for quality measurement is transmitted to the terminal in multiple beams (eg, multiple candidate beams or multiple secondary beams). A value determined relative to the maximum received power of the reference signal at the terminal is set as the threshold.
- the control unit 150 may include in the report setting information information indicating the constant value (difference value ⁇ D) used when relatively determining the threshold.
- a method other than having the terminal 201 report a resource whose received power is equal to or less than a threshold is also possible.
- terminal 201 may be caused to report a resource with relatively low received power.
- terminal 201 may be caused to report a predetermined number of resources in ascending order of received power. In this case, the above number of resources (or interference beams) are identified in ascending order of received power based on the received power values measured by terminal 201 . That is, a predetermined number of resources are identified in order from the lowest received power.
- the control unit 150 may indicate to the terminal 201 which reception beam (third beam) the terminal 201 uses to receive the interference beam.
- the base station 101 transmits a reference signal (second reference signal) using a desired beam (second beam) using a certain resource (third resource).
- the base station 101 instructs the terminal 201 to use the same beam as the beam used by the terminal 201 to receive the reference signal to receive each interference beam (more precisely, to receive the reference signal transmitted by the interference beam). instruct.
- the base station may include this indication in the report configuration information.
- terminal 201 receives each interference beam transmitted from at least one of base station 101 and base station 102 using a reception beam determined according to the instruction in the report configuration information.
- control unit 150 may use the report setting information to instruct the terminal 201 to use the following method to determine the reception beam (third beam) used to receive the interference beam.
- Base station 101 transmits reference signals (second reference signals) to terminal 201 using a plurality of candidate beams (second beams) using different resources (third resources).
- Terminal 201 determines a reception beam for receiving each candidate beam, and receives each candidate beam using the determined reception beam.
- a reception beam used for reception of the candidate beam having the highest reception power value or a predetermined value or more among the reception power values of the candidate beams is determined as a reception beam for receiving each interference beam.
- the present disclosure when a desired beam is transmitted from the base station to the terminal, it is assumed that a beam group with low interference with the desired beam is detected. can be extended and applied to cases other than beam transmission.
- the present disclosure can be applied to a situation in which a base station is equipped with multiple variable directivity antennas and signals are transmitted from the multiple variable directivity antennas at the same frequency with different directivities at the same time.
- the beam may be read as directional transmission, for example.
- FIG. 10 is a block diagram illustrating an example of terminal 201 according to an embodiment of the present disclosure.
- Terminal 201 includes antenna 210 , wireless communication section 220 , storage section 240 and control section 250 .
- the antenna 210 radiates the signal output by the wireless communication unit 220 into space as radio waves. Antenna 210 also converts radio waves in space into a signal and outputs the signal to wireless communication section 220 . Antenna 210 may have multiple antenna elements and form a beam (a receive beam or a third beam).
- the wireless communication unit 220 and the control unit 150 are, for example, processors (hardware processors) such as CPU (Central Processing Unit), MPU (Micro-Processing Unit), ASIC (Application Specific Integrated Circuit) and FPGA (Field-Programmable Gate Array) or the like.
- the storage unit 240 is implemented by any recording medium such as a memory, hard disk device, optical disk, or magnetic recording device.
- the memory may be volatile memory or non-volatile memory.
- the wireless communication unit 220 transmits and receives signals.
- a signal contains data or information.
- the wireless communication unit 220 includes a signal transmission unit 221 that transmits signals and a signal reception unit 222 that receives signals.
- the signal receiver 222 receives downlink signals from the base station, and the signal transmitter 221 transmits uplink signals to the base station.
- the wireless communication unit 220 can form one or more beams (receiving beam or third beam) with the antenna 210 and receive signals including data or information from the base station 101 .
- a receive beam is formed based on a filter for beam reception, which is sometimes also called a receive spatial filter (RX spatial filter).
- RX spatial filter receive spatial filter
- the storage unit 240 temporarily or permanently stores programs and various data for operating the terminal 201 .
- the control unit 250 controls the overall operation of the terminal 201 and provides various functions of the terminal 201 .
- the control unit 250 may receive multiple candidate beams transmitted from the base station 101 and measure the received power. That is, the control unit 250 receives the reference signal for quality measurement in each candidate beam from the base station 101 by beam sweeping using different resources, and calculates the received power value of each reference signal (received power value of each candidate beam). Measure. The control unit 250 determines, for example, the candidate beam with the largest received power value as the desired beam, and transmits information indicating the determined desired beam to the base station 101 . When the control unit 250 receives a reference signal for quality measurement from the desired beam from the base station 101 , it measures channel state information (CSI) and transmits the measured CSI to the base station 101 .
- CSI channel state information
- control section 250 may measure CSI for each of a plurality of beam candidates in response to a request from base station 102 and feed back the CSI.
- the desired beam to be used for transmission to terminal 201 may be determined in base station 101 based on the CSI of each beam candidate.
- the received power or CSI of the reference signal transmitted by the beam is an example of information representing the communication quality of the beam.
- the desired beam determination method described in this paragraph is an example, and other methods are also possible.
- the control unit 250 also has a function of detecting an interference beam group with low interference with the desired beam.
- the control unit 250 measures the received power of the interference beam according to the report setting information, and determines the resource where the interference beam with the received power value equal to or lower than the threshold is transmitted.
- Report information containing the identifying information is sent to the base station 101 .
- the report setting information specifies a plurality of resources (first resources) through which interference beams are transmitted, and the control unit 250 receives reference signals (first reference signals) transmitted using these resources. , to measure the received power.
- Control section 250 detects a resource for which a received power value equal to or lower than a threshold value is measured, and reports (feeds back) information specifying the detected resource to base station 101 .
- the control unit 250 acquires the threshold used for comparison with the received power value from the report setting information.
- the threshold may be stored in the storage unit 240 in advance, and the threshold may be obtained from the storage unit 240 .
- an upper limit (N) is set for the number of resources to be reported in the report setting information
- the base station 101 is notified of information specifying the number of resources equal to or less than the upper limit (N).
- the control unit 250 acquires the information specifying the resource, for example, from a channel in the same slot (or frame) as the reference signal, or by reading from the reference signal.
- the control unit 250 calculates the threshold value according to the instruction.
- the control unit 250 receives a reference signal for quality measurement (second reference signal) transmitted from the base station 101 with a beam (for example, a desired beam or a second beam).
- the control unit 250 sets a value determined relative to the received power value of the reference signal as a threshold. For example, a value lower than the received power value by a constant value (difference value ⁇ D) is set as the threshold.
- the control unit 250 receives a reference signal for quality measurement (second reference signal) transmitted from the base station 101 in a plurality of beams (eg, a plurality of candidate beams or a plurality of second beams).
- the control unit 250 sets a value determined relative to the maximum value of received power of the reference signal as a threshold. For example, a value lower than the maximum value by a constant value (difference value ⁇ D) is set as the threshold. Information specifying the constant value (difference value ⁇ D) may be included in the report setting information. Alternatively, the constant value (difference value ⁇ D) may be stored in storage unit 240 in advance.
- control unit 250 specifies the resource by that method, report to For example, if the report configuration information includes an instruction to report resources with relatively low received power, a predetermined number of resources are reported to the base station 101 in ascending order of received power. For example, the control unit 250 specifies resources (or interference beams) in ascending order of received power, and sends report information including information specifying a predetermined number of resources in descending order of received power to the base station 101. Send.
- the control unit 250 may be instructed by the base station 101 which reception beam (third beam) is used by the terminal 201 to receive the interference beam.
- the terminal 201 receives a reference signal (second reference signal) transmitted by a desired beam (second beam) using a certain resource (third resource) of the base station 101 .
- the control unit 250 determines a reception beam from a plurality of candidate beams for reception, and receives the reference signal (receives the desired beam) with the determined reception beam. For example, the control unit 250 selects the reception beam with the largest received power from among the plurality of candidates.
- the report setting information indicates that the terminal 201 uses the same beam as the beam used for receiving the reference signal for receiving each interference beam (more precisely, for receiving the reference signal transmitted by the interference beam).
- the control unit 250 determines the determined reception beam as a beam for receiving the interference beam, and receives the interference beam with the reception beam.
- control unit 250 may be instructed in the report setting information to use the following method as a method for determining the reception beam (third beam) used by the terminal 201 to receive the interference beam.
- the control unit 250 receives reference signals (second reference signals) transmitted from the base station 101 by a plurality of candidate beams (second beams) using different resources (third resources).
- the controller 250 determines a reception beam for receiving each candidate beam, and receives each candidate beam using the determined reception beam.
- a reception beam used for reception of the candidate beam having the highest reception power value or a predetermined value or more among the reception power values of the candidate beams is determined as a reception beam for receiving each interference beam.
- the base station 101 sets a plurality of resources (interference measurement resources or first resources) for measuring the received power of the interference beam (first beam), and among these resources, the absolute value
- the terminal 201 is made to report the information specifying the resource for which the received power equal to or lower than the threshold is measured. More details are as follows.
- the base station 101 determines a plurality of resources for measuring interference with an interfering beam for a specific beam (eg, desired beam).
- a resource is a downlink frequency and time resource, such as a CSI-RS (Channel State Information-Reference Signal) resource.
- CSI-RS Channel State Information-Reference Signal
- These multiple resources may be individually configured. Alternatively, one or more may be set as a resource set (Resource Set) in which a plurality of resources form a group.
- the base station 101 measures the received power in the plurality of resources for interference measurement determined in this way, and instructs the terminal 201 to report the information specifying the resource with the received power equal to or lower than the threshold with the report setting information.
- resource IDs specifically, CRI (CSI-RS Resource Identification)
- Base station 101 transmits report configuration information to terminal 201 .
- the report configuration information may be included in RRC messages (e.g., RRCSetupmessage, RRCReconfigurationmessage) and transmitted from the base station 101 to the terminal 201 .
- the reception beam used by the terminal 201 to receive the interference beam is the same as the reception beam used by the terminal 201 to receive the desired beam.
- the base station 101 may set information designating a desired beam as a reception beam that the terminal 201 uses to receive an interference beam in the report setting information.
- the threshold is the threshold specified by the above-described absolute value.
- -120 dBm can be used as an example absolute value.
- the interference is sufficiently low when the received power is 120 dBm or less.
- a terminal has a defined reception power limit. For example, if a terminal is configured to receive a signal even with a received power of -100 dBm and there is interference of -120 dBm, the SINR will be 20 dB. In this case, the terminal can sufficiently decode the received signal. Therefore, regardless of the magnitude of the received power of the desired beam, simply comparing the received power value of the interference signal (interference beam) with the threshold enables detection of a beam with low interference with respect to the desired beam.
- the above-described upper limit (N) may be set for the number of resources to be reported by the terminal, and the upper limit may be set in the report setting information. This simplifies the algorithm on the base station side when the number of interfering beams (or resources) whose received power values are equal to or lower than the threshold becomes very large. In addition, by limiting the number of resources to be reported to the terminal, it is possible to suppress deterioration in frequency utilization efficiency.
- FIG. 11 is a diagram schematically showing an operation example of the base stations 101 and 102 and the terminal 201 in Specific Example 1.
- FIG. 11 is a diagram schematically showing an operation example of the base stations 101 and 102 and the terminal 201 in Specific Example 1.
- base station 101 determines a desired beam for terminal 201 . Therefore, by beam sweeping, reference signals are transmitted by five beams TB1 using different resources, and the terminal 201 receives the reference signals transmitted by each beam TB1 using corresponding reception beams. Receiving a reference signal transmitted by a beam may be expressed as receiving a beam.
- the reception beam for receiving each beam TB1 may be determined by the terminal 201 or the base station 101 by any method.
- the terminal 201 selects the beam with the highest received power among the plurality of candidate receive beams as the receive beam for each beam B1.
- multiple beams output from terminal 201 are multiple candidate reception beams.
- the terminal 201 transmits the ID of the resource using the selected reception beam to the base station 101, and the base station 101 determines the beam TB1 transmitted by the resource of the ID notified from the terminal 201 as the desired beam.
- the determined desired beam TB1_A among the plurality of beams TB1 is indicated by oblique lines.
- the reception beam RB1 used by the terminal 201 to receive the desired beam is indicated by oblique lines.
- the base station 101 transmits five interference measurement beams (interference beams) TB2, and the base station 102 transmits ten interference beams TB3. These interference beams TB2, TB3 are transmitted on different resources. Beams other than the desired beam TB1_A among the plurality of beams TB1 may also be transmitted as interference beams. This example describes the case where only the interference beams TB2 and TB3 are transmitted as interference beams. Terminal 201 receives these interference beams TB2 and TB3 with reception beam RB1 for receiving the above-described desired beam.
- a reference signal for interference measurement (first reference signal) is transmitted in the interference beams TB2 and TB3.
- the reference signals transmitted in each interference beam may be signals of the same configuration or signals of different configurations. Each reference signal may be distinguishable by a different ID.
- the terminal 201 receives these interference beams TB2 and TB3 using the reception beam RB1 and measures the reception power.
- the terminal 201 detects an interference beam whose received power value is equal to or less than the absolute value threshold as a low-interference beam with respect to the desired beam.
- two interference beams TB2 indicated by dots and five interference beams TB3 indicated by dots are detected as low interference beams.
- FIG. 12 schematically shows an example of detecting an interference beam having a received power value equal to or lower than a threshold (or detecting a resource from which the interference beam was transmitted).
- the horizontal axis indicates the resource to which the interference beam is transmitted, and the vertical axis indicates the received power value of the interference beam (more specifically, the received power value of the reference signal transmitted by the interference beam) in the resource.
- interference beams transmitted by two resources indicated by hatching are detected as interference beams having received power values equal to or less than the threshold.
- the terminal 201 uplink-transmits to the base station 101 report information (report) including the ID of the resource from which the detected interference beam was transmitted and the received power value of the detected interference beam.
- the resource for transmitting the report from the terminal 201 may be specified in advance by the base station 101 to the terminal 201 in report setting information, or may be specified by other methods (e.g., DCI (Downlink Control Information), MAC Control Element) for reporting. resource may be indicated to the terminal 201 .
- the base station 101 designates in advance the resource for transmitting the report from the terminal 201 to the terminal 201 in the report setting information, and the report is triggered by other methods (e.g., DCI (Downlink Control Information), MAC Control Element) may be used to instruct the terminal 201.
- DCI Downlink Control Information
- MAC Control Element e.g., MAC Control Element
- Base station 101 from the interference beams included in the report received from terminal 201, transmits the desired beam TB1_A to terminal 201 and, at the same time, a beam that can be transmitted to other terminals other than terminal 201 (less interference to the desired beam or beam) can be selected.
- the base station 101 may transmit to the base station 102 the IDs of the resources for which the interference beams have been transmitted from the base station 102 among the IDs of the resources specified in the report.
- the base station 102 causes the terminal 201 to interfere with the desired beam TB1_A by selecting a beam to be transmitted to another terminal belonging to the cell of the base station 102 from among the interference beams transmitted using the resources of the ID. can be selected without (lower).
- Table 1 below shows an example of information set from the base station 101 to the terminal 201 .
- the settings are divided into report configuration and resource configuration.
- the terminal operates according to these settings.
- FIG. 13 shows a setting example of the report configuration.
- FIG. 14 shows an example of resource configuration settings.
- the Cell ID indicates in which frequency band (Component Carrier) the resource to be measured exists.
- Resource Configuration ID for interference measurement indicates which resource to monitor to measure the received power of the interference beam.
- the configuration of the resource to be monitored is indicated by a separately defined resource configuration ID (see FIG. 14 to be described later). Note that no resource configuration is required for the resource to monitor the desired beam. This is because, in the present embodiment, a low-interference beam is detected by comparing the received power value of the interference beam with a threshold value, which is an absolute value, regardless of the received power value of the desired beam.
- Threshold value for detected interference resource indicates the absolute value of the threshold to be compared with the received power value of the interference beam.
- Resource configuration for Report indicates which uplink resource to use for reporting.
- Low interference resource list ⁇ 1, .
- a resource is identified by, for example, a resource ID (eg, CRI, etc.).
- the Reference Signal Resource Set List contains multiple RS Resource Sets (Reference Signal Resource Sets) composed of multiple DL RSs (Downlink Reference Signals).
- the BWP ID indicates which BWP is one of multiple partial frequency bands (BWP) that separate the frequency band (Component Carrier).
- QCL-Info indicates that the reception beam of the terminal used when the desired beam was received (see reception beam RB1 in FIG. 11) is used for interference beam measurement. If the QCL is not set, the terminal side can arbitrarily set the reception beam for receiving the interference beam.
- FIG. 15 shows an example of the specification of the terminal operation method in Concrete Example 1.
- FIG. 15 describes the following contents.
- a terminal For interference source identification, a terminal is configured by higher layers with a reporting configuration and a CSI-resource configuration.
- the following resources are configured via higher layer signaling for configuring one or more CSI resources for interference measurements: NZP (Non-Zero Power) CSI-RS resource L1 (Layer 1) for dedicated interference measurement -
- N For dedicated interference measurement, the terminal shall up to CRI (CSI-RS resource identification) below a threshold defined by an absolute value. N must be reported to the network.
- a terminal may apply the QCL-TypeD assumption with the configured NZP-CSI-RS resources for dedicated interference measurements. If there is no QCL configuration, the terminal can arbitrarily select the RX spatial filter (receive spatial filter) for reception of CSI-RS resources.
- Example 2 In Specific Example 2, a plurality of resources for determining a desired beam (channel measurement resources or third resources) and a plurality of resources for measuring interference beams (interference measurement resources or first resources) set. A relative threshold is set with reference to the received power of the resource using the determined desired beam, and information identifying the resource for which the received power below the threshold is measured among the interference measurement resources (for example, resource ID ) to the base station.
- the threshold was set by an absolute value.
- the method of Specific Example 1 is also effective when the base station knows the received power when the desired beam is received by the terminal and can set the threshold in consideration of the received power of the desired beam.
- complicated processing is required for the base station to grasp the received power of the desired beam and set a threshold value considering the received power.
- multiple resources for determining the desired beam are set, and candidate beams for determining the desired beam are transmitted using the multiple resources.
- a power value lower than the received power of the resource with the highest received power on the terminal side by a constant value ⁇ D is determined as a threshold (threshold as a relative value). This makes it possible to determine the threshold without complicating the processing of the base station.
- the candidate beam transmitted using the highest resource may be set as the desired beam.
- Table 2 below shows an example of information set from the base station 101 to the terminal 201 .
- candidate beams are transmitted using a plurality of resources for determining the desired beam, and the candidate beam (or resource) with the highest received power is specified. Therefore, unlike the specific example 1, the desired beam is determined. Also configure multiple resources for
- ⁇ D may be a fixed value (eg, 20 dB, etc.). In this case, the process of setting ⁇ D in the report setting information (report configuration) that the base station transmits to the terminal may be omitted.
- FIG. 16 schematically shows an example of detecting an interference beam having a reception power value equal to or lower than the threshold value lower than the reception power value of the desired beam by a certain value ⁇ D.
- the horizontal axis is the resource where the channel measurement beam (candidate beam) is transmitted
- the vertical axis is the received power value of the candidate beam in the resource (more specifically, the reference signal transmitted by the candidate beam). received power value).
- a power value lower by ⁇ D than the received power in the resource (resource indicated by hatching) where the candidate beam with the highest received power is transmitted is set as the threshold.
- the horizontal axis is the resource where the beam for interference measurement (interference beam) is transmitted
- the vertical axis is the received power value of the interference beam in the resource (more specifically, the reference signal transmitted by the interference beam). received power value).
- Interference beams transmitted by two resources indicated by diagonal lines are detected as interference beams having received power values below the threshold.
- a method for setting the information shown in Table 2 from the base station 101 to the terminal 201 will be specifically described. For example, as described below, settings are divided into a report configuration and a resource configuration. Terminals are required to operate according to these settings.
- FIG. 17 shows a setting example of the report configuration. Only differences from the report configuration of FIG. 13 shown in the specific example 1 will be explained.
- Resource Configuration ID for channel measurement indicates which resource to monitor to measure the received power of the interference beam.
- the resource configuration is indicated by a separately defined resource configuration ID.
- the resource for channel measurement and the resource for interference measurement are separate resources, but the resource configuration format may be common between Resource Configuration ID for channel measurement and Resource Configuration ID for interference measurement.
- “Difference value for determining threshold value for detected interference resource” indicates that a value smaller than the received power value of the desired beam by ⁇ D (Difference value) is set as the threshold. That is, the threshold value in Specific Example 2 is a relative value based on the received power of the desired beam.
- FIG. 18 shows an example of resource configuration settings.
- the resource configuration format may be common between Resource Configuration ID for channel measurement and Resource Configuration ID for interference measurement.
- the resource configuration in FIG. 18 corresponds to the resource configuration in FIG. 14 shown in Specific Example 1 with QCL-Info removed. Therefore, detailed description of FIG. 18 is omitted.
- FIG. 19 shows an example of the specification of the terminal operation method in specific example 2.
- FIG. 19 describes the following contents.
- a terminal For interference source identification, a terminal is configured by higher layers with a reporting configuration and a CSI-resource configuration.
- the following resources are configured via higher layer signaling for configuration of one or more CSI resources for interference measurement (eg, by sending an RRC message containing an Information Element indicating the following resources): NZP (Non-Zero Power) CSI-RS resource L1 (Layer 1) for dedicated interference measurement -
- NZP Non-Zero Power
- CSI-RS resource L1 (Layer 1) for dedicated interference measurement
- the terminal must have a CRI (CSI-RS A maximum of N resource identifications) shall be reported to the network.
- the terminal may apply the QCL-TypeD assumption with the acquired NZP-CSI-RS resources as the optimal channel for dedicated interference measurements.
- FIG. 20 is a sequence diagram showing an example of procedures performed between the base station 101 and the terminal 201 in the second specific example.
- the base station 101 transmits the report configuration to the terminal 201 (S201).
- Base station 101 further transmits to terminal 201 a resource configuration defining resources for determining a desired beam (resources for channel measurement) and a resource configuration defining resources for interference measurement ( S202, S203).
- These report configuration and resource configuration correspond to report setting information according to the present disclosure.
- the base station 101 sequentially transmits reference signals (second reference signals) using a plurality of resources (third resources) for channel measurement and candidate beams (third beams) that are candidates for the desired beam. (S204).
- Terminal 201 calculates a threshold value by subtracting a constant value ⁇ D from the received power of the beam with the highest received power (desired beam) among the candidate beams.
- the base station 101 sequentially transmits a plurality of interference beams using a plurality of interference measurement resources by beam sweeping (S205).
- the terminal 201 compares the received power value of each interference beam with a threshold, and detects interference beams with received power below the threshold.
- the terminal 201 reports information identifying the detected interference beam to the base station 101 (S206).
- the information identifying the detected interference beam is, for example, the ID of the resource from which the detected interference beam was transmitted.
- the information identifying the detected interference beam may be the ID of the interference beam or the ID of the reference signal transmitted in the interference beam.
- the base station can efficiently acquire a beam with a small amount of interference at the terminal from the beams to be provided to the terminal.
- SINR the amount of interference
- the receiving beam used by the terminal may or may not change. If there is no change in the reception beam of the terminal, the low-interference beam for that reception beam is also unchanged. On the other hand, if the receiving beam is also changed due to the change of the desired beam, the direction of the receiving beam of the terminal is changed, so the low-interference beam is also changed. In other words, what is important in detecting low-interference beams is the reception beam used on the terminal side.
- the control unit 150 of the base station selects a plurality of beams (second beams) that may be used as desired beams between the terminal and the beam range (from which beam to which beam), and the terminal's The correspondence with the receiving beam (third beam) is grasped.
- the control unit 250 on the terminal side transmits to the base station report information (second report information) including information on the reception beam (third beam) used for reception for each beam (second beam), and for each reception beam to the base station.
- the control unit 150 of the base station 101 receives the first report information and the second report information, identifies the beam range in which the same reception beam is used, and associates the beam range with the low-interference beam information.
- the correspondence information obtained is stored in the storage unit 140 .
- the control unit 150 of the base station 101 uses the correspondence information stored in the storage unit 140, so that the base station can efficiently detect a low-interference beam for each desired beam used with the terminal. .
- FIG. 21 is a diagram schematically showing a correspondence relationship between a beam that the base station 101 or the base station 102 may select as a desired beam and a reception beam that a terminal uses to receive the beam in the second embodiment. is.
- the terminal 201 uses the reception beam RB11.
- the terminal 201 uses the reception beam RB12.
- the terminal 201 uses the reception beam RB13.
- base station 102 uses beam TB14 as the desired beam
- terminal 201 uses receive beam RB14. That is, two beams TB11 correspond to the receiving beam RB11, four beams TB12 correspond to the receiving beam RB12, three beams TB13 correspond to the receiving beam RB13, and one beam TB14 corresponds to the receiving beam RB14. corresponds to
- Terminal 201 reports to base station 101 correspondence information indicating which reception beam is used for the beams transmitted from base stations 101 and 102 .
- Table 3 shows an example of correspondence information reported to the base station 101 .
- the reception beam ID (RBI) is an ID that allows identification of the reception beam on the terminal 201 side. There is no need for the base station 101 to know which receive beam ID actually points to which receive beam physically. What the base station 101 needs to know is the relationship between the reception beam used by the terminal 201 and the beam range of the base station using the reception beam.
- FIG. 22 shows a setting example of a report configuration for terminal side beam status (report configuration for UE side beam status) according to the second embodiment.
- the Cell ID and Resource configuration for Report are the same as in the first embodiment.
- Resource Configuration ID for UE side beam status instructs which resource to monitor and check the received beam corresponding to each beam.
- the resource configuration is indicated by a separately defined resource configuration ID.
- the format of Resource configuration for UE side beam status is the same as normal resource configuration (see FIG. 18).
- UE side beam status list is a list of receive beam IDs (RBI) that indicate which receive beams the terminal side used for the above resources prepared for checking the receive beams used on the terminal side.
- RBI receive beam IDs
- the terminal 201 needs to report to the base station according to the report configuration for UE side beam status setting in FIG.
- FIG. 23 shows a setting example of a resource configuration for low interference beams according to the second embodiment.
- the Cell ID is the same as in the first embodiment.
- Resource configuration of optimal beams specifies, as a representative resource, one of the resources used in Report Configuration for UE side beam status, each of which has a different receive beam specified.
- the reception beams to be investigated for interference beams are specified by the IDs of the resources using the respective reception beams.
- a description example in this case corresponds to ⁇ target resource (1), target resource (2), target resource (3), target resource (4), ..., target resource (maximum number of target resources) ⁇ in FIG. .
- RBI reception beam ID
- a description example in this case corresponds to ⁇ target RBI (1), target RBI (2), target RBI (3), target RBI (4), ..., target RBI (maximum number of target RBI) ⁇ in FIG. .
- Resource Configuration ID for low interference beams indicates which resources to monitor to identify interference beams.
- the resource configuration is indicated by a separately defined resource configuration ID.
- the format of the resource configuration for low interference beams is the same as the normal resource configuration (see FIG. 18).
- the Resource configuration for Report is the same as in the first embodiment.
- the maximum number of elements in a list is N.
- X is an integer greater than or equal to 1 and less than or equal to Y, and Y corresponds to the number of reception beams.
- the terminal 201 needs to report to the base station 101 according to the Report configuration for low interference beams setting in FIG.
- the terminal 201 reports to the base station a plurality of low-interference beams corresponding to each of the plurality of reception beams, so that even if the desired beam of the terminal 201 is changed, the desired beam after the change It is possible to efficiently detect beams with low interference depending on the beam.
- FIG. 24 shows an example of the specification of the terminal operation method in this embodiment.
- FIG. 24 describes the following contents.
- the maximum number of reception beams (spatial filters) of the terminal is four, but the maximum number of reception beams is not limited to four.
- a terminal For interference source identification, a terminal is configured by higher layers with a reporting configuration and a CSI-resource configuration. The following are configured via higher layer signaling for configuring one or more CSI resources for interference measurements: NZP (Non-Zero Power) CSI-RS resource L1 (Layer 1) for dedicated interference measurement - For dedicated interference measurement, the terminal must have a CRI lower than the optimal channel received power (RSRP) and lower than a configured threshold (CSI-RS resource Identification) shall be reported up to N, corresponding to different spatial filters (up to 4) on each terminal side.
- NZP Non-Zero Power
- L1 Layer 1
- the terminal For dedicated interference measurement, the terminal must have a CRI lower than the optimal channel received power (RSRP) and lower than a configured threshold (CSI-RS resource Identification) shall be reported up to N, corresponding to different spatial filters (up to 4) on each terminal side.
- RSRP optimal channel received power
- CSI-RS resource Identification CSI-RS resource Identification
- FIG. 25 is a sequence diagram showing an example of procedures performed between the base station 101 and the terminal 201 according to this embodiment.
- a resource (third resource) for receiving a plurality of beams that may be selected as the desired beam, Report configuration for UE side beam status and Resource configuration for UE side in FIG. Set by beam status (S301, S302).
- the resource to be set can be distinguished by, for example, a resource ID (CRI), an ID of a beam transmitted by the resource, or the like.
- the base station 101 transmits a reference signal (second reference signal) with a beam (third beam) using a plurality of resources (third resource) by beam sweeping (S307).
- Terminal 201 monitors the configured resources, selects a reception beam for reception for each resource, and indicates which reception beam (third beam) was used for reception of each beam by reception beam ID (RBI). Report to the station (S304).
- the base station 101 determines one resource among one or more resources (third resource) used for receiving the interference beam as a representative resource for each reception beam.
- the base station 101 instructs the terminal 201 to receive the interference beam using the reception beam used when the beam was received by each representative resource (S305, S306).
- This reception beam is designated by the resource ID or reception beam ID of the representative resource.
- the resource ID and reception beam ID of the representative resource are an example of information specifying the reception beam.
- the settings in steps S305 and S306 are performed according to Report Configuration for low interference beams and Resource Configuration for low interference beams in FIG. Report Configuration for low interference beams and Resource Configuration for low interference beams correspond to examples of report setting information according to the present disclosure.
- the base station 101 transmits an interference beam (first beam) using a plurality of resources (first resource) by beam sweeping (S307).
- the terminal 201 receives the interference beam, more specifically, the reference signal (first reference signal) transmitted by the interference beam, using the reception beam (third beam) set as the interference beam above.
- the terminal 201 reports the ID of the beam whose received power is below the threshold (or the ID of the resource to which the beam was transmitted) as the ID of the low-interference beam to the base station (S308).
- the base station acquires the correspondence information between the range of the beam and the reception beam, and further detects one or more low-interference beams for each of the plurality of reception beams in the terminal. Even if the desired beam used for transmission to the terminal is changed, the base station identifies the reception beam corresponding to the desired beam based on the correspondence information between the beam range and the reception beam, and efficiently transmits the low-interference beam to the terminal. can be effectively detected.
- this disclosure can also take the following configurations.
- a transmission unit that transmits setting information that instructs to measure the reception power of a first reference signal for interference measurement that is transmitted on a plurality of first resources; a receiving unit that receives first report information including information specifying a second resource having a received power equal to or lower than a threshold or relatively low among the plurality of first resources; base station with [Item 2] The base station according to item 1, wherein the configuration information includes the threshold and includes information instructing to use the threshold. [Item 3] The transmitting unit transmits a second reference signal for quality measurement using a third resource different from the plurality of first resources, 3.
- the base station according to item 1 or 2 wherein the threshold is a value determined relative to the received power value of the second reference signal.
- the base station according to item 3 wherein the threshold is a value lower than the received power value of the second reference signal by a constant value.
- the configuration information includes information instructing to set the number of the second resources specified in the first report information to an upper limit value or less, 5.
- the transmitting unit transmits a second reference signal for quality measurement using a second beam using a third resource, and the configuration information is used to receive the second reference signal transmitted using the second beam.
- the transmitting unit transmits a second reference signal for quality measurement by a plurality of different second beams on a plurality of third resources, The setting information is such that, among the plurality of third beams used to receive the second reference signal transmitted by the plurality of second beams, the reception power of the second reference signal is the maximum or is equal to or greater than a predetermined value.
- the threshold is a value lower than the received power of a beam having the maximum received power or a predetermined value or more by a certain value.
- the first report information includes an ID of the second resource as information specifying the second resource.
- the first report information includes, as information specifying the second resource, an ID of a first beam used in the second resource.
- the transmitting unit transmits a second reference signal for quality measurement by a plurality of second beams on a plurality of third resources
- the receiving unit receives, for each of the second beams, second report information including information specifying a third beam used to receive the second reference signal, and the setting information is transmitted in the first beam. instructing to use the third beam for receiving the first reference signal that is received; 12.
- the base station according to any one of items 6 to 11, wherein the first report information includes information specifying the second resource for each third beam.
- the information specifying the third beam includes an ID of the third beam.
- the information specifying the second resource includes an ID of the second resource.
- [Item 15] 15. The base station according to item 13 or 14, wherein the information specifying the second resource includes an ID of the first beam used in the second resource.
- the transmission unit transmits the setting information to the communication device, 17.
- [Item 18] Transmitting configuration information instructing to measure the received power of a first reference signal for interference measurement transmitted on a plurality of first resources; A communication method, comprising: receiving first report information including information specifying a second resource, among the plurality of first resources, the received power of which is below a threshold or relatively low.
- a receiving unit that receives setting information that instructs to measure the reception power of a first reference signal for interference measurement that is transmitted on a plurality of first resources; a control unit that measures received power of the first reference signal transmitted on the first resource; a transmitting unit that detects a second resource whose received power is below a threshold or relatively low among the plurality of first resources, and transmits first report information including information specifying the second resource; Communication device.
- [Item 20] Receive configuration information instructing to measure the reception power of the first reference signal for interference measurement transmitted on a plurality of first resources, measuring the received power of the first reference signal transmitted on the first resource; Detecting a second resource whose received power is below a threshold or relatively low among the plurality of first resources, and transmitting first report information including information specifying the second resource.
- Base station 102 base station 110 antenna 120 radio communication unit 121 signal transmission unit 122 signal reception unit 130 network communication unit 140 storage unit 150 control unit 151 transmission unit 152 reception unit 201 terminal 210 antenna 220 radio communication unit 221 signal transmission unit 222 signal Receiving unit 240 Storage unit 250 Control unit 300 Core network 400 Packet data network 1000 Base station 1000A Base station 1000B Base station 2000 Terminal 2000A Terminal 2000B Terminal
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Abstract
Description
まずローカル5Gで行われるビームフォーミングとその問題点について説明する。
図1で説明したビームマネジメントにおいて基地局1000が端末2000から取得する情報について説明する。
図6は、Rel16 TS38.331 Section 6.3.2におけるレポート・コンフィギュレーションを抜粋したものを示す。レポート・コンフィギュレーションに基づき、端末が周波数と時間とにより設定された複数のリソースをモニター(受信電力を測定)して、モニターの結果を報告するための設定が、基地局から端末に対して事前に行われる。より詳細には以下の通りである。
Reference Signal Resource Set Listには、複数のDL RS(Downlink Reference Signal)のリソースで構成されたRS Resource Set(Reference Signal Resource Set)が複数含まれている。つまり、参照信号(Reference Signal)が送信されるリソースがセットになったものがリストとして含まれている。
BWP IDには、どのBWP(Bandwidth Part)を用いるかが示されている。つまり上記のリソースがどのBWPに属するものかが示されている。BWPとは、周波数帯域であるコンポーネント・キャリア(Component Carrier)を部分的な周波数領域に区切った各部分のことである。
従来では、ある特定のビーム(例えば所望ビーム)を基地局が用いたときに、所望ビームとの干渉が弱い多数のビームの情報を基地局が取得する方法は無かった。基地局が、あるビームとの干渉が強いビームを全て(もれなく)取得できるなら、干渉が強いビームの情報を取得する方法も有効であるが、干渉が強いビームの情報をすべて取得することは、現実的ではない。
本実施形態は、基地局が端末に所望ビームを用いてあるリソースでデータ(ダウンリンクデータ)を送信するとした場合に、同時に同じリソースで他の端末へのデータ送信に用いることが可能な低干渉のビームを効率的に検出する。これにより、端末へのビーム送信の品質を維持しつつ、同じリソースで他の端末へのビーム送信も同時に可能になるため、ダウンリンクのスループットを向上させることが可能となる。以下、本実施形態について詳細に説明する。
図9は、本開示の実施形態に係る基地局101の一例を示すブロック図である。基地局101は、アンテナ110、無線通信部120、ネットワーク通信部130、記憶部140及び制御部150を備える。基地局102は、5Gにおける通常のgNBの機能を備え、さらに本実施形態に係る基地局101の指示に従った動作を行う機能を備えるものとする。基地局102が基地局101と同様の構成を備えていてもよい。無線通信部120、ネットワーク通信部130、及び制御部150は、例えば、CPU(Central Processing Unit)、MPU(Micro-Processing Unit)等のプロセッサ(ハードウェアプロセッサ)、ASIC(Application Specific Integrated Circuit)やFPGA(Field-Programmable Gate Array)等の集積回路により実現される。記憶部140は、メモリ、ハードディスク装置、光ディスク又は磁気記録装置など、任意の記録媒体により実現される。メモリは、揮発性メモリでも、不揮発性メモリでもよい。
本開示の実施形態では、基地局から端末に所望ビームで送信を行う場合に、所望ビームとの干渉が低いビーム群を検出する状況等を想定しているが、基地局から端末に指向性送信を行う場合であれば、ビーム送信以外の場合にも拡張して適用可能である。例えば基地局が指向性可変アンテナを複数具備し、複数の指向性可変アンテナから同一周波数で同時に異なる指向性で信号を送信する状況にも本開示を適用場合も可能である。この場合、本実施形態における説明の記載において、例えばビームを指向性送信などと読み替えればよい。
図10は、本開示の実施形態に係る端末201の一例を示すブロック図である。端末201は、アンテナ210、無線通信部220、記憶部240及び制御部250を備える。
具体例1では、基地局101が干渉ビーム(第1ビーム)の受信電力を測定するための複数のリソース(干渉測定用リソース又は第1リソース)を設定し、これらのリソースの中から、絶対値による閾値以下の受信電力が測定されたリソースを特定する情報を端末201に報告させる。より詳細には、以下の通りである。
Low interference resource list={1, …., Max number of low interference resources}は、閾値との比較により検出された低干渉のビームが送信されたリソースを最大数(上限値)以下で報告する。リソースは、例えばリソースのID(例えばCRI等)によって特定される。
干渉源の識別のため、端末はレポート・コンフィギュレーションとCSI-リソース・コンフィギュレーションとを伴って上位レイヤによって設定される。
以下のリソースが、干渉測定用の1つ以上のCSIリソース設定のための上位レイヤシグナリングを介して設定される:
専用干渉測定用のNZP(Non-Zero Power) CSI-RS リソース
L1(レイヤ1)-専用干渉測定のため、端末は、絶対値によって定められる閾値より小さいCRI(CSI-RS resource Identification)を最大でN個、ネットワークに報告しなければならない。
端末は、専用干渉測定のための設定されたNZP-CSI-RSリソースを用いてQCL-TypeDの仮定を適用してもよい。QCL設定が存在しない場合は、端末は、CSI-RSリソースの受信用のRX空間フィルタ(受信空間フィルタ)を任意に選択することができる。
具体例2では、所望ビームを決定するための複数のリソース(チャネル測定用のリソース又は第3リソース)と、干渉ビームを測定するための複数のリソース(干渉測定用のリソース又は第1リソース)とを設定する。決定された所望ビームが用いられたリソースの受信電力を基準として相対的な閾値を設定し、干渉測定用リソースのうち、閾値以下の受信電力が測定されたリソースを特定する情報(例えばリソースのID)を基地局に報告する。
例えば、以下に説明するように、レポート・コンフィギュレーション(report configuration)とリソース・コンフィギュレーション(resource configuration)に分けて設定を行う。端末は、これらの設定に従って動作することが必要となる。
干渉源の識別のため、端末はレポート・コンフィギュレーションとCSI-リソース・コンフィギュレーションとを伴って上位レイヤによって設定される。
以下のリソースが、干渉測定用の1つ以上のCSIリソース設定のための上位レイヤシグナリングを介して(e.g, RRCメッセージに以下のリソースを示すInformation Elementを含めて送信することで)設定される:
専用干渉測定用のNZP(Non-Zero Power) CSI-RS リソース
L1(レイヤ1)-専用干渉測定のため、端末は、最適なチャネルの受信電力(RSRP)より低い閾値より小さいCRI(CSI-RS resource Identification)を最大でN個、ネットワークに報告しなければならない。
端末は、専用干渉測定のため、最適なチャネルとして獲得されたNZP-CSI-RSリソースを用いてQCL-TypeDの仮定を適用してもよい。
第1の実施形態によれば、基地局は、端末に提供するビームに対して、端末における干渉量が少ないビームを効率的に取得することが可能になる。従来では、端末が所望ビームを受信している時に、基地局により指定された別のビームを受信したとしたら得られる干渉量(SINR)を測定し、SINRを報告する仕組みが用意されていた。しかしながら、複数の基地局間のビーム又は同一基地局による複数のビーム間の干渉を減らすには、所望ビームを使用中に、どのビームが干渉を起こさないという情報を把握していることの方が有用である。しかしながら、そのような情報を取得する手法は従来存在しなかった。本実施形態では、上述した手法により、干渉が問題とならないビーム群を効率的に検出できるため、端末に提供するビームとの間で相互に干渉しない又は干渉が少ないビームを用いて、他の端末に同時にデータをビーム送信することが可能となる。これにより、ダウンリンクのスループットを向上させることが可能となる。
上述の第1の実施形態では、基地局が所望ビームで送信するデータを端末が受信ビームで受信している場合に、端末に対する干渉が少ないビーム群を効率的に検出することができる。しかしながら、端末が移動した場合や電波の状況が変化した場合など、端末の環境が変動することなどで、端末の所望ビームが変更されることがある。所望ビームが変更されるごとに、変更後の所望ビームに応じた低干渉のビームを検出する手続を行うことは、手続に利用するリソースの使用量の増大を招き、処理のオーバーヘッドも大きくなる。本実施形態は、端末の所望ビームが変更されても、効率的に低干渉のビームを検出することを実現する。
あるいは、リソースIDではなく、受信ビームのID(RBI)を直接指定する方法も可能である。この場合の記載例が、図24における{target RBI (1), target RBI (2), target RBI(3), target RBI(4), …,target RBI(maximum number of target RBI)}に対応する。
干渉源の識別のため、端末はレポート・コンフィギュレーションとCSI-リソース・コンフィギュレーションとを伴って上位レイヤによって設定される。
以下が、干渉測定用の1つ以上のCSIリソース設定のための上位レイヤシグナリングを介して設定される:
専用干渉測定用のNZP(Non-Zero Power) CSI-RS リソース
L1(レイヤ1)-専用干渉測定のため、端末は、最適なチャネルの受信電力(RSRP)より低い、設定された閾値より小さいCRI(CSI-RS resource Identification)を最大でN個、各端末側における異なる空間フィルタ(最大で4個)に対応して、報告しなければならない。
ステップS305、S306の設定は、図23のReport Configuration for low interference beams及びResource Configuration for low interference beamsによって行う。Report Configuration for low interference beams及びResource Configuration for low interference beamsは、本開示に係るレポート設定情報の一例に相当する。
本実施形態によれば、基地局は、ビームの範囲と受信ビームとの対応情報を取得し、さらに、端末における複数の受信ビーム毎に、低干渉である1つ以上のビームを検出する。基地局は、端末への送信に用いる所望ビームが変更されても、ビームの範囲と受信ビームとの対応情報に基づき、所望ビームに対応する受信ビームを特定し、端末に低干渉のビームを効率的に検出することができる。
[項目1]
複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を送信する送信部と、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを特定する情報を含む第1報告情報を受信する受信部と、
を備えた基地局。
[項目2]
前記設定情報は、前記閾値を含み、前記閾値を用いることを指示する情報を含む
項目1に記載の基地局。
[項目3]
前記送信部は、前記複数の第1リソースと異なる第3リソースで品質測定用の第2参照信号を送信し、
前記閾値は、前記第2参照信号の受信電力値を基準として相対的に定められる値である 項目1又は2に記載の基地局。
[項目4]
前記閾値は、前記第2参照信号の受信電力値より一定値低い値である
項目3に記載の基地局。
[項目5]
前記設定情報は、前記第1報告情報で特定する前記第2リソースの個数を上限値以下にすることを指示する情報を含み、
前記第1報告情報で特定される前記第2リソースの個数は、前記上限値以下である
項目1~4のいずれか一項に記載の基地局。
[項目6]
前記複数の第1リソースで送信される複数の前記第1参照信号は、複数の異なる第1ビームによって送信される
項目1~5のいずれか一項に記載の基地局。
[項目7]
前記送信部は、第3リソースで第2ビームにより品質測定用の第2参照信号を送信し、 前記設定情報は、前記第2ビームで送信される前記第2参照信号を受信するのに用いられた第3ビームを前記第1ビームで送信される前記第1参照信号の受信に用いることを指示する情報を含む
項目6に記載の基地局。
[項目8]
前記送信部は、複数の第3リソースで複数の異なる第2ビームにより品質測定用の第2参照信号を送信し、
前記設定情報は、前記複数の第2ビームで送信される前記第2参照信号を受信するのに用いられた複数の第3ビームのうち、前記第2参照信号の受信電力が最大又は所定値以上のビームを用いて、複数の前記第1ビームで送信される前記第1参照信号を受信することを指示する情報を含む
項目6又は7に記載の基地局。
[項目9]
前記閾値は、前記受信電力が最大又は所定値以上のビームの前記受信電力より一定値低い値である
項目8に記載の基地局。
[項目10]
前記第1報告情報は、前記第2リソースを特定する情報として、前記第2リソースのIDを含む
項目1~9のいずれか一項に記載の基地局。
[項目11]
前記第1報告情報は、前記第2リソースを特定する情報として、前記第2リソースで用いられた第1ビームのIDを含む
項目6~10のいずれか一項に記載の基地局。
[項目12]
前記送信部は、複数の第3リソースで複数の第2ビームにより品質測定用の第2参照信号を送信し、
前記受信部は、前記第2ビームごとに、前記第2参照信号の受信に用いられた第3ビームを特定する情報を含む第2報告情報を受信し
前記設定情報は、前記第1ビームで送信される前記第1参照信号の受信に前記第3ビームを用いることを指示し、
前記第1報告情報は、前記第3ビームごとに前記第2リソースを特定する情報を含む
項目6~11のいずれか一項に記載の基地局。
[項目13]
前記第3ビームを特定する情報は、前記第3ビームのIDを含む
項目12に記載の基地局。
[項目14]
前記第2リソースを特定する情報は、前記第2リソースのIDを含む
項目12又は13に記載の基地局。
[項目15]
前記第2リソースを特定する情報は、前記第2リソースで用いられた前記第1ビームのIDを含む
項目13又は14に記載の基地局。
[項目16]
前記第1参照信号は、前記基地局または、前記基地局と異なる他の基地局によって送信される信号である
項目1~15のいずれか一項に記載の基地局。
[項目17]
前記送信部は、前記設定情報を通信装置に送信し、
前記受信部は、前記第1報告情報を前記通信装置から受信する
項目1~16のいずれか一項に記載の基地局。
[項目18]
複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を送信し、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを特定する情報を含む第1報告情報を受信する
通信方法。
[項目19]
複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を受信する受信部と、
前記第1リソースで送信される前記第1参照信号の受信電力を測定する制御部と、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを検出し、前記第2リソースを特定する情報を含む第1報告情報を送信する送信部と
を備えた通信装置。
[項目20]
複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を受信し、
前記第1リソースで送信される前記第1参照信号の受信電力を測定し、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを検出し、前記第2リソースを特定する情報を含む第1報告情報を送信する
通信方法。
102 基地局
110 アンテナ
120 無線通信部
121 信号送信部
122 信号受信部
130 ネットワーク通信部
140 記憶部
150 制御部
151 送信部
152 受信部
201 端末
210 アンテナ
220 無線通信部
221 信号送信部
222 信号受信部
240 記憶部
250 制御部
300 コアネットワーク
400 パケットデータネットワーク
1000 基地局
1000A 基地局
1000B 基地局
2000 端末
2000A 端末
2000B 端末
Claims (20)
- 複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を送信する送信部と、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを特定する情報を含む第1報告情報を受信する受信部と、
を備えた基地局。 - 前記設定情報は、前記閾値を含み、前記閾値を用いることを指示する情報を含む
請求項1に記載の基地局。 - 前記送信部は、前記複数の第1リソースと異なる第3リソースで品質測定用の第2参照信号を送信し、
前記閾値は、前記第2参照信号の受信電力値を基準として相対的に定められる値である 請求項1に記載の基地局。 - 前記閾値は、前記第2参照信号の受信電力値より一定値低い値である
請求項3に記載の基地局。 - 前記設定情報は、前記第1報告情報で特定する前記第2リソースの個数を上限値以下にすることを指示する情報を含み、
前記第1報告情報で特定される前記第2リソースの個数は、前記上限値以下である
請求項1に記載の基地局。 - 前記複数の第1リソースで送信される複数の前記第1参照信号は、複数の異なる第1ビームによって送信される
請求項1に記載の基地局。 - 前記送信部は、第3リソースで第2ビームにより品質測定用の第2参照信号を送信し、 前記設定情報は、前記第2ビームで送信される前記第2参照信号を受信するのに用いられた第3ビームを前記第1ビームで送信される前記第1参照信号の受信に用いることを指示する情報を含む
請求項6に記載の基地局。 - 前記送信部は、複数の第3リソースで複数の異なる第2ビームにより品質測定用の第2参照信号を送信し、
前記設定情報は、前記複数の第2ビームで送信される前記第2参照信号を受信するのに用いられた複数の第3ビームのうち、前記第2参照信号の受信電力が最大又は所定値以上のビームを用いて、複数の前記第1ビームで送信される前記第1参照信号を受信することを指示する情報を含む
請求項6に記載の基地局。 - 前記閾値は、前記受信電力が最大又は所定値以上のビームの前記受信電力より一定値低い値である
請求項8に記載の基地局。 - 前記第1報告情報は、前記第2リソースを特定する情報として、前記第2リソースのIDを含む
請求項1に記載の基地局。 - 前記第1報告情報は、前記第2リソースを特定する情報として、前記第2リソースで用いられた第1ビームのIDを含む
請求項6に記載の基地局。 - 前記送信部は、複数の第3リソースで複数の第2ビームにより品質測定用の第2参照信号を送信し、
前記受信部は、前記第2ビームごとに、前記第2参照信号の受信に用いられた第3ビームを特定する情報を含む第2報告情報を受信し
前記設定情報は、前記第1ビームで送信される前記第1参照信号の受信に前記第3ビームを用いることを指示し、
前記第1報告情報は、前記第3ビームごとに前記第2リソースを特定する情報を含む
請求項6に記載の基地局。 - 前記第3ビームを特定する情報は、前記第3ビームのIDを含む
請求項12に記載の基地局。 - 前記第2リソースを特定する情報は、前記第2リソースのIDを含む
請求項12に記載の基地局。 - 前記第2リソースを特定する情報は、前記第2リソースで用いられた前記第1ビームのIDを含む
請求項13に記載の基地局。 - 前記第1参照信号は、前記基地局または、前記基地局と異なる他の基地局によって送信される信号である
請求項1に記載の基地局。 - 前記送信部は、前記設定情報を通信装置に送信し、
前記受信部は、前記第1報告情報を前記通信装置から受信する
請求項1に記載の基地局。 - 複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を送信し、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを特定する情報を含む第1報告情報を受信する
通信方法。 - 複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を受信する受信部と、
前記第1リソースで送信される前記第1参照信号の受信電力を測定する制御部と、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを検出し、前記第2リソースを特定する情報を含む第1報告情報を送信する送信部と
を備えた通信装置。 - 複数の第1リソースで送信される干渉測定用の第1参照信号の受信電力を測定することを指示する設定情報を受信し、
前記第1リソースで送信される前記第1参照信号の受信電力を測定し、
前記複数の第1リソースのうち、前記受信電力が閾値以下又は相対的に低い第2リソースを検出し、前記第2リソースを特定する情報を含む第1報告情報を送信する
通信方法。
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