WO2020143051A1 - Procédé et dispositif de commutation de bwp - Google Patents

Procédé et dispositif de commutation de bwp Download PDF

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Publication number
WO2020143051A1
WO2020143051A1 PCT/CN2019/071465 CN2019071465W WO2020143051A1 WO 2020143051 A1 WO2020143051 A1 WO 2020143051A1 CN 2019071465 W CN2019071465 W CN 2019071465W WO 2020143051 A1 WO2020143051 A1 WO 2020143051A1
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WIPO (PCT)
Prior art keywords
csi
bwp
terminal device
csi measurement
information
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PCT/CN2019/071465
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English (en)
Chinese (zh)
Inventor
徐伟杰
陈文洪
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN201980060669.0A priority Critical patent/CN112703808B/zh
Priority to PCT/CN2019/071465 priority patent/WO2020143051A1/fr
Publication of WO2020143051A1 publication Critical patent/WO2020143051A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the embodiments of the present application relate to the field of communications, and more specifically, to a method and device for switching a bandwidth (Bandwidth Part) (BWP).
  • BWP bandwidth
  • BWP Bandwidth Part
  • the network device may configure multiple BWPs to the terminal device, and different BWPs may have different bandwidth sizes, different frequency positions, and different subcarrier intervals.
  • the terminal device can switch between different BWPs, for example, a BWP with a larger bandwidth is used when the service transmission rate is high, and a BWP with a smaller bandwidth is used when the service transmission rate is low.
  • the network device may indicate the BWP to be switched to the terminal device through the BWP indicator field (BWP indicator) in DCI.
  • BWP indicator BWP indicator
  • the terminal device can only perform channel state information (Channel State Information, CSI) measurement on the currently activated BWP. Therefore, before the terminal device switches from the currently activated BWP to another BWP, the terminal device cannot measure and report the CSI information on the other BWP. Therefore, the data scheduled by the network device before the terminal device switches to another BWP may not match the channel condition of the terminal device, thus affecting the data transmission performance of the system.
  • CSI Channel State Information
  • the embodiments of the present application provide a BWP switching method and device, which can improve the data transmission performance of the system.
  • a BWP handover method including: a terminal device receives a CSI measurement request message, the CSI measurement request message includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information used for the CSI measurement Information of the BWP where the CSI-RS is located; the terminal device determines whether to switch the BWP of the bandwidth part according to the information of the BWP where the CSI-RS is located.
  • the terminal device determines whether to switch the bandwidth part of the BWP based on the information of the BWP where the CSI-RS is located, including: if the currently activated BWP and the BWP where the CSI-RS is located The same, the terminal device determines not to switch BWP; and/or, if the currently activated BWP is different from the BWP where the CSI-RS is located, the terminal device determines to switch to the BWP where the CSI-RS is located.
  • the method further includes: if the terminal device determines to switch to the BWP where the CSI-RS is located, within a preset duration T after receiving the CSI measurement request message , Switch to the BWP where the CSI-RS is located, where T is less than or equal to the time offset of the CSI-RS relative to the CSI measurement request message.
  • the terminal device does not send or receive signals within the preset duration T.
  • the configuration information of the CSI measurement further includes at least one of the following information: the time offset of the CSI-RS relative to the CSI measurement request message, the CSI-RS Frequency band position, frequency domain resource density of the CSI-RS, and antenna port transmitting the CSI-RS.
  • the method further includes the terminal device performing the CSI measurement on the BWP where the CSI-RS is located according to the configuration information of the CSI measurement.
  • the CSI measurement request message is carried in DCI for scheduling an uplink data channel.
  • the DCI is a DCI format 0-1.
  • the DCI further includes: resource allocation information of a physical shared uplink channel PUSCH for reporting CSI measurement results, and/or timing information for reporting CSI measurement results.
  • the timing information includes at least one of the following information: the timing difference between the PUSCH and the CSI-RS, and between the PUSCH and the CSI measurement request message Timing difference.
  • the method further includes: the terminal device reporting the result of the CSI measurement according to the PUSCH resource allocation information and/or the timing information.
  • the CSI measurement request message is carried in DCI for scheduling downlink data channels.
  • the DCI is a DCI format 1-1.
  • the method further includes the terminal device reporting the result of the CSI measurement on a pre-configured PUSCH.
  • the method further includes the terminal device reporting the result of the CSI measurement on a periodically configured physical uplink control channel PUCCH.
  • the CSI-RS is configured to track the reference signal TRS.
  • the method further includes: the terminal device performing time-frequency tracking according to the TRS.
  • the switching of the BWP includes switching of the downlink BWP.
  • the switching of the BWP includes switching of the downstream BWP and switching of the upstream BWP.
  • a BWP handover method including: a network device sending a CSI measurement request message, where the CSI measurement request message includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information used for the CSI measurement Information of the BWP where the CSI-RS is located, and the information of the BWP where the CSI-RS is located is used by the terminal device to determine whether to switch the bandwidth part of the BWP.
  • the information of the BWP where the CSI-RS is located is used by the terminal device to determine that the BWP is not switched when the currently activated BWP is the same as the BWP where the CSI-RS is located, and// Or, switch to the BWP where the CSI-RS is located when the currently activated BWP is different from the BWP where the CSI-RS is located.
  • the configuration information of the CSI measurement further includes at least one of the following information: the time offset of the CSI-RS relative to the CSI measurement request message, the CSI-RS Frequency band position, frequency domain resource density of the CSI-RS, and antenna port transmitting the CSI-RS.
  • the configuration information of the CSI measurement is also used for the terminal device to perform the CSI measurement on the BWP where the CSI-RS is located.
  • the CSI measurement request message is carried in DCI for scheduling an uplink data channel.
  • the DCI is a DCI format 0-1.
  • the DCI further includes: resource allocation information of a physical shared uplink channel PUSCH for reporting CSI measurement results, and/or timing information for reporting CSI measurement results.
  • the timing information includes at least one of the following information: the timing difference between the PUSCH and the CSI-RS, and between the PUSCH and the CSI measurement request message Timing difference.
  • the resource allocation information of the PUSCH and/or the timing information is used for the terminal device to report the result of the CSI measurement.
  • the CSI measurement request message is carried in DCI for scheduling downlink data channels.
  • the DCI is a DCI format 1-1.
  • the method further includes: the network device sends indication information, where the indication information is used to indicate a periodically configured physical uplink control channel PUCCH, and the periodically configured PUCCH is used for all
  • the terminal device reports the result of the CSI measurement.
  • the CSI-RS is configured to track a reference signal TRS, and the TRS is used for time-frequency tracking by the terminal device.
  • the switching of the BWP includes switching of the downlink BWP.
  • the switching of the BWP includes switching of the downstream BWP and switching of the upstream BWP.
  • a terminal device which can execute the method in the first aspect or any optional implementation manner of the first aspect.
  • the terminal device may include a functional module for performing the method in the first aspect or any possible implementation manner of the first aspect.
  • a network device which can execute the method in the second aspect or any optional implementation manner of the second aspect.
  • the network device may include a functional module for performing the method in the second aspect or any possible implementation manner of the second aspect.
  • a terminal device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • a network device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method in the second aspect or any possible implementation manner of the second aspect.
  • a chip for implementing the above-mentioned first aspect or the method in any possible implementation manner of the first aspect.
  • the chip includes a processor for calling and running a computer program from the memory, so that the device installed with the chip executes the method in the first aspect or any possible implementation manner of the first aspect.
  • a chip for implementing the method in the second aspect or any possible implementation manner of the second aspect.
  • the chip includes a processor for calling and running a computer program from the memory, so that the device installed with the chip executes the method in the second aspect or any possible implementation manner of the second aspect.
  • a computer-readable storage medium for storing a computer program, which causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • a computer-readable storage medium for storing a computer program that causes a computer to execute the method in the second aspect or any possible implementation manner of the second aspect.
  • a computer program product including computer program instructions, which cause the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • a computer program product including computer program instructions that cause a computer to perform the method in the second aspect or any possible implementation manner of the second aspect.
  • a computer program which when run on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • a computer program which when run on a computer, causes the computer to execute the method in the second aspect or any possible implementation manner of the second aspect.
  • a communication system including terminal equipment and network equipment.
  • the network device is configured to send a CSI measurement request message, where the CSI measurement request message includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of BWP where a CSI-RS used for the CSI measurement is located.
  • the terminal device is configured to receive a CSI measurement request message, where the CSI measurement request message includes CSI measurement configuration information, and the CSI measurement configuration information includes BWP information where the CSI-RS used for the CSI measurement is located; According to the information of the BWP where the CSI-RS is located, it is determined whether to switch the BWP of the bandwidth part.
  • the terminal device can implement the BWP switching through the CSI measurement request message. Since the terminal device can complete the CSI measurement and reporting on the BWP after the switch according to the CSI measurement request message at this time, the network device The data scheduled in the BWP can also match the channel status of the terminal device, which improves the data transmission performance of the system.
  • FIG. 1 is a schematic diagram of a possible wireless communication system applied in an embodiment of the present application.
  • FIG. 2 is a flow interaction diagram of a method of BWP switching according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of BWP handover and CSI measurement according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of BWP handover and CSI measurement according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of BWP handover and TRS measurement according to an embodiment of the present application.
  • FIG. 6 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • FIG. 10 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • GSM Global Mobile System
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • LTE-A Advanced Long Term Evolution
  • NR New Radio
  • NR Universal Mobile Telecommunication System
  • WiMAX Global Mobile Telecommunication System
  • WLAN Wireless Local Area Networks
  • WiMAX Worldwide Interoperability for Microwave Access
  • D2D Device to Device
  • M2M machine-to-machine
  • MTC machine type communication
  • V2V vehicle-to-vehicle
  • the communication system in the embodiments of the present application may be applied to scenarios such as carrier aggregation (CA), dual connectivity (DC), and standalone (SA) networking.
  • CA carrier aggregation
  • DC dual connectivity
  • SA standalone networking
  • the wireless communication system 100 may include a network device 110.
  • the network device 110 may be a device that communicates with a terminal device.
  • the network device 110 can provide communication coverage for a specific geographic area, and can communicate with terminal devices located within the coverage area.
  • the network device 100 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the network-side device in the NR system, or the wireless controller in the cloud radio access network (Cloud Radio Access Network, CRAN), or the network device can be a relay station, access Incoming points, in-vehicle devices, wearable devices, network-side devices in next-generation networks, or network devices in future public land mobile networks (Public Land Mobile Network, PLMN), etc.
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • LTE Long Term Evolutional Node B, eNB or eNodeB
  • CRAN Cloud Radio Access Network
  • the network device can be a relay station, access Incoming points, in-vehicle devices, wearable devices, network-
  • the wireless communication system 100 further includes at least one terminal device 120 located within the coverage of the network device 110.
  • the terminal device 120 may be mobile or fixed.
  • the terminal device 120 may refer to an access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication Device, user agent, or user device.
  • User Equipment User Equipment
  • Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital processing (Personal Digital Assistant (PDA), wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or terminal devices in future evolved PLMNs, etc.
  • terminal device 120 may also perform terminal direct connection (Device to Device, D2D) communication.
  • the network device 110 may provide services for a cell, and the terminal device 120 communicates with the network device 110 through transmission resources (eg, frequency domain resources, or spectrum resources) used by the cell, and the cell may be the network device 110 (eg, base station)
  • the cell may belong to a macro base station, or a base station corresponding to a small cell (Small cell), where the small cell may include, for example, a metro cell, a micro cell, and a pico cell , Femtocells, etc.
  • These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.
  • FIG. 1 exemplarily shows one network device and two terminal devices.
  • the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within the coverage area. The application examples do not limit this.
  • the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiments of the present application.
  • the system bandwidth and the bandwidth used by the terminal equipment may reach hundreds of megahertz (MHz) or even several GHz of bandwidth to support data transmission in high-speed mobile scenarios.
  • the terminal device does not always need such a large bandwidth at all times.
  • the terminal device only needs to use a smaller working bandwidth, for example, a bandwidth of 10 MHz is sufficient.
  • a bandwidth of 10 MHz is sufficient.
  • the BWP may be a part of the system bandwidth, for example, the system bandwidth is 100 MHz, and the terminal device may use a BWP with a bandwidth less than 100 MHz, such as 20 MHz and 50 MHz, to perform data transmission within the system bandwidth.
  • a BWP with a bandwidth less than 100 MHz, such as 20 MHz and 50 MHz, to perform data transmission within the system bandwidth.
  • up to 4 BWPs can be configured to the terminal device at the same time. Different BWPs can have different bandwidths, different frequency positions, and different subcarrier spacings.
  • the network device may instruct the terminal device to switch between multiple BWPs according to the service requirements of the terminal device. For example, when the service transmission rate is higher, the terminal device uses a larger bandwidth BWP, and when the service transmission rate is lower, the terminal device uses a smaller bandwidth BWP.
  • the network device may indicate the BWP to be switched to the terminal device through the BWP indicator file (BWP indicator filed) in the DCI that schedules the data transmission of the terminal device.
  • the length of the BWP indication field depends on the number of BWPs configured by the system for the terminal device.
  • the BWP indication field may be 0 bits, 1 bit, or 2 bits.
  • BWP indicator field value (2bit) BWP ID 00 BWP1 01 BWP 2 10 BWP 3 11 BWP 4
  • the network device When the BWP of the terminal device needs to be switched, the network device carries a BWP different from the BWP where the terminal device is currently located in the BWP indication field in the DCI sent to the terminal device. After the terminal device receives the DCI, the terminal device determines the BWP to be switched according to the value of the BWP indication field therein, thereby performing the switching.
  • the DCI format sent by the network device to the terminal device carrying the BWP indication field may be DCI format 0-1 or DCI format 1-1.
  • DCI format 0-1 is used to schedule uplink (Uplink, UL) transmission, that is, DCI format 0-1 is used for uplink scheduling (UL grant), and the BWP indication field in the DCI can be used to instruct the terminal device to perform uplink BWP (UL) BWP) switching.
  • DCI format 1-1 is used for scheduling downlink (DL) transmission, that is, DCI format 1-1 is used for downlink scheduling (DL grant), and the BWP indication field in the DCI can be used to instruct the terminal device to perform downlink BWP (DL BWP) Switch.
  • the terminal equipment supports periodic CSI measurement and reporting, and aperiodic CSI measurement and reporting.
  • periodic CSI measurement and reporting the terminal device may perform periodic CSI measurement based on the CSI-RS periodically sent by the network device, and report the measurement result to the network device.
  • aperiodic CSI measurement and reporting the terminal device may perform aperiodic CSI-RS measurement according to the configuration information of the CSI-RS measurement sent by the network device, and report the measurement result to the network device.
  • the configuration information of the CSI-RS measurement is used to indicate the CSI-RS sent by the network device aperiodically.
  • the terminal device can only perform CSI measurement on the currently activated BWP, but cannot perform CSI measurement on other BWP. Therefore, before the terminal device switches from the currently activated BWP to another BWP, the terminal device cannot perform CSI measurement and reporting on the other BWP. Before the terminal device switches to the other BWP, when the network device schedules a Physical Downlink Shared Channel (PDSCH) on the other BWP, the channel condition of the terminal device on the other BWP can only be conservative Estimate to determine parameters such as coding rate.
  • PDSCH Physical Downlink Shared Channel
  • the network device can be based on the CSI measurement result of the BWP reported by the terminal device To match the channel status of the terminal device to perform PDSCH scheduling.
  • the data scheduling performed by the network device may not match the channel condition of the terminal device, so it affects The data transmission performance of the system.
  • the embodiments of the present application provide a BWP switching method, which can enable the BWP switching of the terminal device not to affect the data transmission performance of the system.
  • FIG. 2 is a schematic flowchart of a method 200 for BWP switching according to an embodiment of the present application.
  • the method described in FIG. 2 may be performed by a terminal device and a network device.
  • the terminal device may be, for example, the terminal device 120 shown in FIG. 1
  • the network device may be, for example, the network device 110 shown in FIG. 1.
  • the method 200 for BWP switching may include some or all of the following steps. among them:
  • the network device sends a CSI measurement request message.
  • the terminal device receives the CSI measurement request message.
  • the terminal device determines whether to perform BWP switching according to the CSI measurement request message.
  • the CSI measurement request message includes configuration information of CSI measurement.
  • the configuration information of the CSI measurement includes information of the BWP where the CSI-RS used for CSI measurement is located.
  • the terminal device may determine whether to switch the BWP according to the information of the BWP where the CSI reference signal (CSI-Reference Signal, CSI-RS) is located.
  • CSI-Reference Signal CSI-Reference Signal
  • the terminal device determines, according to the information of the BWP where the CSI-RS is located, whether to switch the bandwidth part of the BWP, including:
  • the terminal device determines not to switch BWP; and/or,
  • the terminal device determines to switch to the BWP where the CSI-RS is located.
  • the configuration information of the CSI measurement includes information of the BWP where the CSI-RS is located.
  • the network device instructs the terminal device to perform BWP handover through the information of the BWP where the CSI-RS is located.
  • the terminal device needs to switch to the BWP where the CSI-RS is located.
  • the terminal device when the terminal device determines to switch to the BWP where the CSI-RS is located, it switches to the BWP where the CSI-RS is located within a preset time period T after receiving the CSI measurement request message.
  • T is less than or equal to the time offset of the CSI-RS relative to the CSI measurement request message, that is, T is less than or equal to the time period from when the terminal device receives the CSI measurement request message to when it starts to receive the CSI-RS.
  • a duration T can be configured, and the terminal device must be able to switch from the currently activated BWP to the BWP where the CSI-RS is located within the duration T, that is, the duration T is the terminal device Able to complete the time required for BWP switching.
  • the terminal device After the terminal device receives the CSI measurement request message, it can complete the BWP switching within the next time period T, and the start transmission time of the CSI-RS is located after the BWP switching completion time or after the BWP switching completion time.
  • the duration T may be pre-configured, for example, as agreed in the protocol, or may be configured by the network device for the terminal device based on the capabilities of the terminal device. T is related to factors such as the BWP switching capability of the terminal device, the subcarrier spacing of the BWP, and the frequency band position where the BWP is located.
  • the network device does not expect the terminal device to transmit and receive signals within the duration T.
  • the terminal device may not transmit and receive signals within the time duration T. However, if the terminal device completes the handover in advance within the duration T, based on the implementation of the terminal device, the signal can be transmitted and received within the remaining time within the duration T.
  • the configuration information of the CSI measurement may further include at least one of the following information: the time offset of the CSI-RS relative to the CSI measurement request message, the frequency band position of the CSI-RS, and the frequency domain resource of the CSI-RS Density, the antenna port transmitting the CSI-RS.
  • the method further includes: the terminal device performs the CSI measurement on the BWP where the CSI-RS is located according to the configuration information of the CSI measurement.
  • the terminal device can implement the BWP switching through the CSI measurement request message. Since the terminal device can complete the CSI measurement and reporting on the switched BWP according to the CSI measurement request message at this time, the network device schedules within the switched BWP The data can also match the channel conditions of the terminal equipment, which improves the data transmission performance of the system.
  • the CSI measurement request message may be carried in downlink control information (Download Control, DCI) for scheduling uplink data channels, such as DCI in the format DCI format 0-1; the CSI measurement request message may also be carried in scheduling downlink data channels DCI, for example, DCI format DCI 1-1.
  • DCI Download Control
  • the embodiment of the present application does not limit the format of the DCI carrying the CSI measurement request message.
  • the DCI may be any one of DCI format 0-0, DCI format 0-1, DCI format 1-0, DCI format 1-1, etc. Species.
  • the DCI When the DCI is used for uplink scheduling, for example, the format is DCI format 0-1, the DCI may further include: physical shared uplink channel (Physical Uplink Shared Channel, PUSCH) resource allocation information for reporting CSI measurement results, and /Or, timing information used to report CSI measurement results.
  • physical shared uplink channel Physical Uplink Shared Channel, PUSCH
  • PUSCH Physical Uplink Shared Channel
  • the timing information may include, for example, a timing difference between the PUSCH and the CSI-RS and/or a timing difference between the PUSCH and the CSI measurement request message.
  • the resource allocation information of the PUSCH may include, for example, the frequency domain position of the PUSCH, the symbol information of the PUSCH occupied in the time slot, and so on.
  • the method further includes: the terminal device reporting the CSI measurement result according to the PUSCH resource allocation information and/or the timing information.
  • the DCI includes configuration information of CSI-RS measurement, and also includes resource allocation information of the PUSCH and/or the timing information.
  • the configuration information of the CSI-RS measurement may be used for the terminal device to perform CSI measurement and BWP switching, and the PUSCH resource allocation information and/or the timing information may be used for the terminal device to report the CSI measurement result.
  • the CSI-RS is a downlink signal
  • its BWP is a downlink BWP. Therefore, the CSI measurement request message described in the embodiment of the present application may be used to indicate the switching of the downlink BWP.
  • the CSI-RS is carried in DCI for uplink scheduling, for example, DCI in the format of DCI format 0-1, the switching of the uplink BWP can be indicated by the BWP indication field in the DCI.
  • the terminal device When the DCI is a DCI used for downlink scheduling, for example, a DCI with a format of DCI format 1-1, since the DCI cannot schedule an uplink data channel, the terminal device cannot obtain uplink resources for reporting the CSI measurement result.
  • the terminal device may report the CSI measurement result on the pre-configured PUSCH, for example, the protocol agreement or the network device configures the timing information, modulation and coding mode (Modulation Coding Mode) between the PUSCH and the DCI MCS) or other information; or, the terminal device can report the results of CSI measurement on a periodically configured Physical Uplink Control Channel (PUCCH).
  • PUCCH Physical Uplink Control Channel
  • the terminal device After the terminal device performs CSI measurement, it can complete the CSI measurement time The latest available PUCCH channel feeds back the result of the CSI measurement.
  • the CSI measurement request message is carried in DCI used for downlink scheduling, if the DCI originally carries a BWP indicator field used to indicate downlink BWP handover, the BWP indicator field may have other functions or may be omitted.
  • DL BWP 1 is the currently activated BWP of the terminal device, and the terminal device receives a physical downlink control channel (Physical Downlink Control Channel, PDCCH) on DL BWP 1, which carries DCI in the PDCCH, assuming the format of the DCI
  • PDCCH Physical Downlink Control Channel
  • the BWP indication field in the DCI can be used to indicate the switching of the upstream BWP
  • the CSI measurement request message in the DCI can be used to indicate the switching of the downstream BWP and the CSI measurement.
  • the DCI also includes PUSCH resource allocation information and timing information for the terminal device to report the CSI measurement result.
  • the terminal device receives the PDCCH on DL BWP 1, the PDCCH carries DCI, and the CSI measurement request message in the DCI includes CSI measurement configuration information, and the CSI measurement configuration information includes CSI-RS The BWP information.
  • the BWP where the CSI-RS sent by the network device is located is the same as the DL currently used by the terminal device BWP1, so the terminal device may not switch the BWP.
  • the terminal device After receiving the CSI request message at time t 1, the terminal device receives the CSI-RS from time t 2 on the DL BWP 1 according to the configuration information of the CSI measurement in the CSI request message, and according to the PUSCH in the DCI The resource allocation information and timing information of the CSI measurement result are sent to the network device on the PUSCH at time t 3 according to the CSI-RS measurement.
  • DL BWP 1 is the BWP currently activated by the terminal device, and the terminal device receives the PDCCH on DL BWP 1, and the PDCCH carries DCI.
  • the format of the DCI is DCI format 0-1.
  • the CSI measurement request message may be used to indicate the switching of the downlink BWP and the CSI measurement.
  • the DCI also includes PUSCH resource allocation information and timing information for the terminal device to report the amount of CSI.
  • the terminal device receives the PDCCH on DL BWP 1, the PDCCH carries DCI, and the CSI measurement request message in the DCI includes configuration information of CSI measurement, and the configuration information of CSI measurement includes CSI-RS The BWP information. It can be seen from FIG. 4 that the BWP where the CSI-RS sent by the network device is DL BWP2 is different from the DL BWP1 currently used by the terminal device, so the terminal device needs to switch from DL BWP1 to DL BWP2.
  • the terminal device After the terminal device receives the CSI request message at time t 1 and finds that the BWP where the CSI-RS is located is different from the currently activated BWP of the terminal device, the terminal device switches from DL BWP 1 to DL BWP 2 within a preset duration T ⁇ t 2 -t 1 . After the handover is completed, the terminal device receives the CSI-RS from time t 2 on the DL BWP1 according to the configuration information of the CSI measurement in the CSI request message. And the terminal device sends the CSI measurement result obtained according to the CSI-RS measurement to the network device on the PUSCH at time t 3 according to the resource allocation information and timing information of the PUSCH in the DCI.
  • the terminal device has completed the BWP switching before performing the CSI measurement. Therefore, the terminal device can perform the CSI measurement on the DL BWP 2 and report the measurement result to the network device. After that, the network device can schedule the data channel transmission on DL BWP2 based on the obtained measurement result, so that the scheduled data can match the channel condition of the terminal device, improve the efficiency of data transmission, and further reduce the power consumption of the terminal device , Reducing resource overhead and increasing system capacity.
  • the CSI-RS in the embodiment of the present application may be configured as a tracking reference signal (Tracking Reference, TRS).
  • TRS Tracking Reference
  • the method may further include: the terminal device performs time-frequency tracking according to the TRS.
  • DL BWP 1 is the BWP currently activated by the terminal device, and the terminal device receives the PDCCH on DL BWP 1, and the PDCCH carries DCI.
  • the format of the DCI is DCI format 0-1, the CSI in the DCI
  • the measurement request message may be used to indicate the switching of the downlink BWP and the CSI measurement.
  • the terminal device receives the PDCCH on DL BWP 1, the PDCCH carries DCI, and the CSI measurement request message in the DCI includes configuration information of CSI measurement, and the configuration information of CSI measurement includes CSI-RS
  • the CSI-RS is configured as TRS. It can be seen from Figure 4 that the BWP where the network device sends the TRS is DL BWP 2, which is different from the DL BWP 1 currently used by the terminal device, so the terminal device needs to switch from DL BWP 1 to DL BWP 2.
  • the terminal device at time t receiving the CSI request message see different BWP terminal device CSI-RS i.e. TRS where the currently active BWP, the terminal device when a preset period T by the DL BWP 1 is switched to the DL BWP2 1, T ⁇ t 2 -t 1 .
  • the terminal device receives the TRS from the time t 2 on the DL BWP 1 according to the configuration information of the CSI measurement in the CSI request message, thereby implementing time-frequency tracking according to the TRS.
  • the measurement result of the TRS need not be reported to the network device.
  • the terminal device has completed the BWP switch before the TRS measurement. Therefore, the terminal device can perform TRS measurement on the DL BWP 2 and use the TRS for time-frequency tracking. After that, the terminal device can achieve more accurate and stable data reception on DL BWP 2 and improve the data transmission performance of the system.
  • the switching of the BWP includes the switching of the downstream BWP; the method is applied to time division duplex (Time Division Duplex, Duplex, TDD) system, the BWP switching includes the switching of the downstream BWP and the switching of the upstream BWP.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • each DL BWP will have a bound UL BWP, so the switching of DL BWP will result in the switching of the corresponding UL BWP.
  • the terminal device of the TDD system performs DL BWP switching according to the CSI measurement request message, the associated UL BWP also needs to be switched.
  • the terminal device can simultaneously complete CSI measurement and reporting, and complete TRS measurement and time-frequency tracking according to the CSI measurement request message, thereby maximizing the data transmission performance of the system.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not be applied to the embodiments of the present application.
  • the implementation process constitutes no limitation.
  • the terminal device 600 includes a transceiver unit 610 and a processing unit 620. among them:
  • the transceiver unit 610 is configured to receive a CSI measurement request message, where the CSI measurement request message includes CSI measurement configuration information, and the CSI measurement configuration information includes BWP information where the CSI-RS used for the CSI measurement is located.
  • the processing unit 620 is configured to determine whether to switch the bandwidth part BWP according to the information of the BWP where the CSI-RS is received by the transceiver unit.
  • the terminal device can implement the BWP switching through the CSI measurement request message. Since the terminal device can complete the CSI measurement and reporting on the switched BWP according to the CSI measurement request message at this time, the network device schedules the BWP after switching The data can also match the channel conditions of the terminal equipment, which improves the data transmission performance of the system.
  • the processing unit 620 is specifically configured to: if the currently activated BWP is the same as the BWP where the CSI-RS is located, determine not to switch the BWP; and/or, if the currently activated BWP and the CSI-RS The BWP where the RS is located is different, and it is determined to switch to the BWP where the CSI-RS is located.
  • the processing unit 620 is further configured to: if it is determined to switch to the BWP where the CSI-RS is located, switch to the CSI within a preset time period T after receiving the CSI measurement request message -BWP where the RS is located, where T is less than or equal to the time offset of the CSI-RS relative to the CSI measurement request message.
  • the terminal device does not send or receive signals within the preset duration T.
  • the configuration information of the CSI measurement further includes at least one of the following information: a time offset of the CSI-RS relative to the CSI measurement request message, a frequency band position of the CSI-RS, the The frequency domain resource density of the CSI-RS and the antenna port transmitting the CSI-RS.
  • the processing unit 620 is further configured to: perform the CSI measurement on the BWP where the CSI-RS is located according to the configuration information of the CSI measurement.
  • the CSI measurement request message is carried in DCI for scheduling uplink data channels.
  • the DCI is a DCI format 0-1.
  • the DCI further includes: resource allocation information of the physical shared uplink channel PUSCH for reporting CSI measurement results, and/or timing information for reporting CSI measurement results.
  • the timing information includes at least one of the following information: a timing difference between the PUSCH and the CSI-RS, and a timing difference between the PUSCH and the CSI measurement request message.
  • the transceiver unit 610 is further configured to report the result of the CSI measurement according to the resource allocation information of the PUSCH and/or the timing information.
  • the CSI measurement request message is carried in DCI for scheduling downlink data channels.
  • the DCI is a DCI format 1-1.
  • the transceiver unit 610 is further configured to: report the result of the CSI measurement on the pre-configured PUSCH.
  • the transceiver unit 610 is further configured to: report the CSI measurement result on a periodically configured physical uplink control channel PUCCH.
  • the CSI-RS is configured to track the reference signal TRS.
  • the processing unit 620 is further configured to perform time-frequency tracking according to the TRS.
  • the switching of the BWP includes switching of the downlink BWP.
  • the switching of the BWP includes switching of the downlink BWP and switching of the uplink BWP.
  • terminal device 600 may perform the corresponding operations performed by the terminal device in the above method 200, and for the sake of brevity, no further details are provided here.
  • FIG. 7 is a schematic block diagram of a network device 700 according to an embodiment of the present application.
  • the network device 700 includes a processing unit 710 and a transceiver unit 720. among them:
  • the processing unit 710 is configured to generate a CSI measurement request message, where the CSI measurement request message includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of the BWP where the CSI-RS used for the CSI measurement is located.
  • the information about the BWP where the CSI-RS is located is used by the terminal device to determine whether to switch the bandwidth part of the BWP;
  • the transceiver unit 720 is configured to send the CSI measurement request message.
  • the terminal device can implement the BWP switching through the CSI measurement request message. Since the terminal device can complete the CSI measurement and reporting on the switched BWP according to the CSI measurement request message at this time, the network device schedules within the switched BWP The data can also match the channel conditions of the terminal equipment, which improves the data transmission performance of the system.
  • the information of the BWP where the CSI-RS is located is used by the terminal device to determine that the BWP is not switched when the currently activated BWP is the same as the BWP where the CSI-RS is located, and/or, when the current activation is performed And the BWP where the CSI-RS is located does not switch to the BWP where the CSI-RS is located at the same time.
  • the configuration information of the CSI measurement further includes at least one of the following information: a time offset of the CSI-RS relative to the CSI measurement request message, a frequency band position of the CSI-RS, the The frequency domain resource density of the CSI-RS and the antenna port transmitting the CSI-RS.
  • the configuration information of the CSI measurement is also used for the terminal device to perform the CSI measurement on the BWP where the CSI-RS is located.
  • the CSI measurement request message is carried in DCI for scheduling uplink data channels.
  • the DCI is a DCI format 0-1.
  • the DCI further includes: resource allocation information of the physical shared uplink channel PUSCH for reporting CSI measurement results, and/or timing information for reporting CSI measurement results.
  • the timing information includes at least one of the following information: a timing difference between the PUSCH and the CSI-RS, and a timing difference between the PUSCH and the CSI measurement request message.
  • the resource allocation information of the PUSCH and/or the timing information is used for the terminal device to report the result of the CSI measurement.
  • the CSI measurement request message is carried in DCI for scheduling downlink data channels.
  • the DCI is a DCI format 1-1.
  • the transceiving unit 720 is further configured to: send indication information, where the indication information is used to indicate a periodically configured physical uplink control channel PUCCH, and the periodically configured PUCCH is used by the terminal device to report the The result of CSI measurement.
  • the CSI-RS is configured to track a reference signal TRS, and the TRS is used for time-frequency tracking by the terminal device.
  • the switching of the BWP includes switching of the downlink BWP.
  • the switching of the BWP includes switching of the downlink BWP and switching of the uplink BWP.
  • the network device 700 may perform the corresponding operations performed by the network device in the above method 200, and for the sake of brevity, no further details are provided here.
  • FIG. 8 is a schematic structural diagram of a communication device 800 provided by an embodiment of the present application.
  • the communication device 800 shown in FIG. 8 includes a processor 810, and the processor 810 can call and run a computer program from the memory to implement the method in the embodiments of the present application.
  • the communication device 800 may further include a memory 820.
  • the processor 810 can call and run a computer program from the memory 820 to implement the method in the embodiments of the present application.
  • the memory 820 may be a separate device independent of the processor 810, or may be integrated in the processor 810.
  • the communication device 800 may further include a transceiver 830, and the processor 810 may control the transceiver 830 to communicate with other devices, specifically, may send information or data to other devices, or receive other Information or data sent by the device.
  • the processor 810 may control the transceiver 830 to communicate with other devices, specifically, may send information or data to other devices, or receive other Information or data sent by the device.
  • the transceiver 830 may include a transmitter and a receiver.
  • the transceiver 830 may further include antennas, and the number of antennas may be one or more.
  • the communication device 800 may specifically be a terminal device according to an embodiment of the present application, and the communication device 800 may implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. .
  • the communication device 800 may specifically be a network device according to an embodiment of the present application, and the communication device 800 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. .
  • FIG. 9 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • the chip 900 shown in FIG. 9 includes a processor 910, and the processor 910 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 900 may further include a memory 920.
  • the processor 910 can call and run a computer program from the memory 920 to implement the method in the embodiments of the present application.
  • the memory 920 may be a separate device independent of the processor 910, or may be integrated in the processor 910.
  • the chip 900 may further include an input interface 930.
  • the processor 910 can control the input interface 930 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.
  • the chip 900 may further include an output interface 940.
  • the processor 910 can control the output interface 940 to communicate with other devices or chips. Specifically, it can output information or data to other devices or chips.
  • the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application.
  • the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip described in the embodiments of the present application may also be referred to as a system-level chip, a system chip, a chip system, or a system-on-chip chip.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities.
  • the steps of the foregoing method embodiments may be completed by instructions in the form of hardware integrated logic circuits or software in the processor.
  • the aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an existing programmable gate array (Field Programmable Gate Array, FPGA), or other available Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically Erase Programmable Read Only Memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM DDR SDRAM
  • enhanced SDRAM ESDRAM
  • Synchlink DRAM SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • the memory in the embodiments of the present application may also be static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random Synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory Take memory (Synch Link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memories in the embodiments of the present application are intended to include but are not limited to these and any other suitable types of memories.
  • FIG. 10 is a schematic block diagram of a communication system 1000 according to an embodiment of the present application. As shown in FIG. 10, the communication system 1000 includes a network device 1010 and a terminal device 1020.
  • the network device 1010 is configured to send a CSI measurement request message, where the CSI measurement request message includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of BWP where a CSI-RS used for the CSI measurement is located.
  • the terminal device 1020 is configured to receive a CSI measurement request message, where the CSI measurement request message includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of BWP where the CSI-RS used for the CSI measurement is located; According to the information of the BWP where the CSI-RS is located, it is determined whether to switch the BWP of the bandwidth part.
  • the network device 1010 may be used to implement the corresponding functions implemented by the terminal device in the above method 200, and the composition of the terminal device 1010 may be as shown in the terminal device 600 in FIG. Repeat again.
  • the terminal device 1020 may be used to implement the corresponding functions implemented by the network device in the above method 200, and the composition of the network device 1020 may be as shown in the network device 700 in FIG. Repeat again.
  • Embodiments of the present application also provide a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium may be applied to the network device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiments of the present application.
  • the computer-readable storage medium can be applied to the terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding process implemented by the terminal device in each method of the embodiments of the present application. Repeat.
  • An embodiment of the present application also provides a computer program product, including computer program instructions.
  • the computer program product may be applied to the network device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program product may be applied to the terminal device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the terminal device in each method of the embodiment of the present application. Repeat again.
  • An embodiment of the present application also provides a computer program.
  • the computer program can be applied to the network device in the embodiment of the present application.
  • the computer program runs on the computer, the computer is allowed to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. And will not be repeated here.
  • the computer program can be applied to the terminal device in the embodiments of the present application.
  • the computer program runs on the computer, the computer is allowed to execute the corresponding process implemented by the terminal device in each method of the embodiments of the present application. And will not be repeated here.
  • system and "network” in the embodiments of the present invention are often used interchangeably herein.
  • the term “and/or” in this article is just an association relationship that describes an associated object, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, exist alone B these three cases.
  • the character “/” in this article generally indicates that the related objects before and after it are in an “or” relationship.
  • B corresponding to (corresponding to) A means that B is associated with A, and B can be determined according to A.
  • determining B based on A does not mean determining B based on A alone, and B may also be determined based on A and/or other information.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a division of logical functions.
  • there may be another division manner for example, multiple units or components may be combined or may Integration into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product
  • the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the foregoing storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

L'invention concerne un procédé de commutation de BWP pouvant améliorer les performances de transmission de données d'un système. Le procédé consiste : à recevoir, au moyen d'un dispositif terminal, un message de demande de mesure de CSI, le message de demande de mesure de CSI comprenant des informations de configuration de mesure de CSI, et les informations de configuration de mesure de CSI comprenant des informations concernant un BWP où se trouve un CSI-RS pour la mesure de CSI ; à déterminer, au moyen du dispositif terminal, s'il faut effectuer une commutation de BWP en fonction des informations du BWP où se trouve le CSI-RS.
PCT/CN2019/071465 2019-01-11 2019-01-11 Procédé et dispositif de commutation de bwp WO2020143051A1 (fr)

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