CN112703808B

CN112703808B - Method and apparatus for BWP handover

Info

Publication number: CN112703808B
Application number: CN201980060669.0A
Authority: CN
Inventors: 徐伟杰; 陈文洪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2022-10-21
Anticipated expiration: 2039-01-11
Also published as: CN112703808A; WO2020143051A1

Abstract

The application discloses a BWP switching method, which can improve the data transmission performance of a system. The method comprises the following steps: the method comprises the steps that terminal equipment receives a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of BWP where a CSI-RS used for the CSI measurement is located; and the terminal equipment determines whether to switch the BWP according to the information of the BWP where the CSI-RS is located.

Description

Method and apparatus for BWP handover

Technical Field

The present embodiments relate to the field of communications, and in particular, to a method and an apparatus for Bandwidth part (BWP) handover.

Background

In the 5G New wireless (NR) system, the concept of BWP is introduced. The network device may configure multiple BWPs to the terminal device, and different BWPs may have different bandwidth sizes, different frequency locations, different subcarrier spacings, and so on. The terminal device may switch between different BWPs, for example, using the BWP with the larger bandwidth when the traffic transmission rate is higher, and using the BWP with the smaller bandwidth when the traffic transmission rate is lower. The network device may indicate the BWP to be switched to the terminal device through a BWP indicator field (BWP indicator filtered) in the DCI (Downlink Control Information).

The terminal device can only perform Channel State Information (CSI) measurement on the currently activated BWP. Therefore, before the terminal device switches from the currently active BWP to another BWP, the terminal device cannot measure and report the CSI information on the other BWP. Therefore, 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.

Disclosure of Invention

The embodiment of the application provides a method and a device for switching BWP, which can improve the data transmission performance of a system.

In a first aspect, a BWP handover method is provided, including: a terminal device receives a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of BWP (channel State protocol) where a CSI-RS (CSI Reference Signal) for the CSI measurement is located; and the terminal equipment determines whether to switch the BWP of the bandwidth part according to the information of the BWP where the CSI-RS is positioned.

In a possible implementation manner, the determining, by the terminal device, whether to perform the switching of the bandwidth part BWP according to the information of the BWP where the CSI-RS is located includes: if the currently activated BWP is the same as the BWP where the CSI-RS is located, the terminal device determines not to switch the BWP; and/or if the currently activated BWP is different from the BWP where the CSI-RS is located, the terminal equipment determines to switch to the BWP where the CSI-RS is located.

In one possible implementation, the method further includes: if the terminal equipment determines to switch to the BWP where the CSI-RS is located, the terminal equipment switches to the BWP where the CSI-RS is located within a preset time length T after the CSI measurement request message is received, wherein T is smaller than or equal to the time offset of the CSI-RS relative to the CSI measurement request message.

In a possible implementation manner, the terminal device does not perform signal transceiving within the preset time period T.

In a possible implementation manner, the configuration information of the CSI measurement further includes at least one of the following information: time offset of the CSI-RS relative to the CSI measurement request message, frequency band position of the CSI-RS, frequency domain resource density of the CSI-RS, and antenna port for transmitting the CSI-RS.

In one possible implementation, the method further includes: and the terminal equipment performs the CSI measurement on the BWP where the CSI-RS is located according to the configuration information of the CSI measurement.

In a possible implementation manner, the CSI measurement request message is carried in DCI for scheduling an uplink data channel.

In one possible implementation, the DCI is DCI format 0-1.

In one possible implementation, the DCI further includes: resource allocation information of a Physical Uplink Shared Channel (PUSCH) for reporting a CSI measurement result, and/or timing information for reporting a CSI measurement result.

In one possible implementation, the timing information includes at least one of the following information: a timing difference between the PUSCH and the CSI-RS, a timing difference between the PUSCH and the CSI measurement request message.

In one possible implementation, the method further includes: and the terminal equipment reports the CSI measurement result according to the resource allocation information and/or the timing information of the PUSCH.

In a possible implementation manner, the CSI measurement request message is carried in DCI for scheduling a downlink data channel.

In one possible implementation, the DCI is DCI format 1-1.

In one possible implementation, the method further includes: and the terminal equipment reports the CSI measurement result on a pre-configured PUSCH.

In one possible implementation, the method further includes: and the terminal equipment reports the CSI measurement result on a periodically configured Physical Uplink Control Channel (PUCCH).

In one possible implementation, the CSI-RS is configured to track a reference signal TRS.

In one possible implementation, the method further includes: and the terminal equipment carries out time-frequency tracking according to the TRS.

In a possible implementation manner, when the method is applied to a Frequency Division Duplex (FDD) system, the switching of the BWP includes switching of a downlink BWP.

In a possible implementation manner, when the method is applied to a Time Division Duplex (TDD) system, the switching of the BWP includes switching of a downlink BWP and switching of an uplink BWP.

In a second aspect, a BWP handover method is provided, including: the method comprises the steps that a network device sends a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, the configuration information of the CSI measurement comprises information of BWP where a CSI-RS used for the CSI measurement is located, and the information of the BWP where the CSI-RS is located is used for a terminal device to determine whether to switch a bandwidth part BWP or not.

In a possible implementation manner, 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.

In one possible implementation, the configuration information of the CSI measurement further includes at least one of the following information: time offset of the CSI-RS relative to the CSI measurement request message, frequency band position of the CSI-RS, frequency domain resource density of the CSI-RS, and antenna port for transmitting the CSI-RS.

In a possible implementation manner, the configuration information of the CSI measurement is further used for the terminal device to perform the CSI measurement on the BWP where the CSI-RS is located.

In a possible implementation manner, the CSI measurement request message is carried in DCI used for scheduling an uplink data channel.

In one possible implementation, the DCI is DCI format 0-1.

In one possible implementation, the DCI further includes: and the resource allocation information of the physical shared uplink channel PUSCH is used for reporting the CSI measurement result, and/or the timing information is used for reporting the CSI measurement result.

In a possible implementation manner, the resource allocation information and/or the timing information of the PUSCH are used for the terminal device to report the CSI measurement result.

In one possible implementation, the DCI is DCI format 1-1.

In one possible implementation, the method further includes: and the network equipment sends indication information, wherein the indication information is used for indicating a periodically configured Physical Uplink Control Channel (PUCCH), and the periodically configured PUCCH is used for the terminal equipment to report the CSI measurement result.

In a possible implementation manner, the CSI-RS is configured to track a reference signal TRS, and the TRS is used for performing time-frequency tracking by the terminal device.

In a possible implementation manner, when the method is applied to a frequency division duplex FDD system, the switching of BWP includes switching of downlink BWP.

In a possible implementation manner, when the method is applied to a time division duplex TDD system, the switching of BWP includes switching of downlink BWP and switching of uplink BWP.

In a third aspect, a terminal device is provided, where the terminal device may perform the method in the first aspect or any optional implementation manner of the first aspect. In particular, the terminal device may comprise functional modules for performing the method of the first aspect or any possible implementation manner of the first aspect.

In a fourth aspect, a network device is provided, which may perform the method of the second aspect or any optional implementation manner of the second aspect. In particular, the network device may comprise functional modules for performing the method of the second aspect or any possible implementation of the second aspect.

In a fifth aspect, a terminal device is provided that includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program stored in the memory to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a sixth aspect, a network device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method of the second aspect or any possible implementation manner of the second aspect.

In a seventh aspect, a chip is provided for implementing the first aspect or the method in any possible implementation manner of the first aspect. In particular, the chip comprises a processor for calling and running a computer program from a memory, so that a device in which the chip is installed performs the method as in the first aspect or any possible implementation manner of the first aspect.

In an eighth aspect, a chip is provided for implementing the method of the second aspect or any possible implementation manner of the second aspect. In particular, the chip comprises a processor for invoking and running a computer program from a memory, such that a device in which the chip is installed performs the method as described above in the second aspect or any possible implementation manner of the second aspect.

A ninth aspect provides a computer readable storage medium storing a computer program for causing a computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a tenth aspect, there is provided a computer readable storage medium for storing a computer program, the computer program causing a computer to perform the method of the second aspect or any possible implementation manner of the second aspect.

In an eleventh aspect, there is provided a computer program product comprising computer program instructions to cause a computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a twelfth aspect, there is provided a computer program product comprising computer program instructions to cause a computer to perform the method of the second aspect or any possible implementation manner of the second aspect.

In a thirteenth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a fourteenth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of the second aspect or any possible implementation of the second aspect.

In a fifteenth aspect, a communication system is provided that includes a terminal device and a network device.

The network device is to: and sending a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of a BWP where a CSI-RS for the CSI measurement is located.

The terminal device is configured to: receiving a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of BWP where a CSI-RS for the CSI measurement is located; and determining whether to switch the bandwidth part BWP according to the information of the BWP where the CSI-RS is located.

By the technical scheme, the terminal device can realize switching of the BWP through the CSI measurement request message, and the terminal device can complete CSI measurement and report on the switched BWP according to the CSI measurement request message, so that data scheduled by the network device in the switched BWP can also be matched with the channel condition of the terminal device, and the data transmission performance of the system is improved.

Drawings

Fig. 1 is a schematic diagram of a possible wireless communication system to which an embodiment of the present application is applied.

Fig. 2 is a flowchart illustrating a BWP switching method according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of BWP switching and CSI measurement according to an embodiment of the present application.

Fig. 4 is a schematic diagram of BWP switching 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 of an embodiment of the present application.

Fig. 8 is a schematic configuration diagram of a communication apparatus according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a chip of an embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication system of an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The following describes technical solutions in the embodiments of the present application with reference to the drawings of the embodiments of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD) System, an Advanced Long Term Evolution (LTE-a) System, a New Radio (New Radio, NR) System, an Evolution System of the NR System, an LTE (LTE-based Access to unlicensed spectrum, LTE-U) System on an unlicensed Frequency band, an NR (NR-based Access to unlicensed spectrum, NR-U) System on an unlicensed Frequency band, a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, a Wireless Local Area Network (WLAN), a Wireless Fidelity (WiFi), a next-generation communication System, or other communication systems.

Generally, the conventional Communication system supports a limited number of connections and is easy to implement, however, with the development of Communication technology, the mobile Communication system will support not only conventional Communication but also Machine to Machine (M2M) Communication, MTC (Machine Type Communication), and V2V (Vehicle to Vehicle) Communication, for example, and the embodiments of the present application can also be applied to these Communication systems.

In one implementation, the communication system in the embodiment of the present application may be applied in Carrier Aggregation (CA), dual Connectivity (DC), standalone (SA) networking, and other scenarios.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The wireless communication system 100 may include a network device 110. Network device 110 may be a device that communicates with a terminal device. Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. In an embodiment, the Network device 100 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, a Network side device in an NR system, a Radio controller in a Cloud Radio Access Network (CRAN), a relay Station, an Access point, a vehicle-mounted device, a wearable device, a Network side device in a next generation Network, a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The wireless communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. The terminal device 120 may be mobile or stationary. In one embodiment, terminal Equipment 120 may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User device. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN, etc. In one embodiment, the terminal devices 120 may also perform direct Device to Device (D2D) communication therebetween.

The network device 110 may provide a service for a cell, and the terminal device 120 communicates with the network device 110 through a transmission resource (e.g., a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device 110 (e.g., a base station), and 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 (Metro cell), a Micro cell (Micro cell), a Pico cell (Pico cell), a Femto cell (Femto cell), and the like, and the Small cells have characteristics of Small coverage and low transmission power, and are suitable for providing a high-rate data transmission service.

Fig. 1 illustrates one network device and two terminal devices, and in one embodiment, the wireless communication system 100 may include a plurality of network devices and each network device may include other numbers of terminal devices within a coverage area, which is not limited by the embodiment of the present application. In addition, the wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

In an NR system, the system bandwidth and the bandwidth used by the terminal device may reach bandwidths of hundreds of megahertz (MHz) or even thousands of MHz (GHz) to support data transmission in a high-speed mobile scenario. However, in the actual data transmission process, the terminal device does not need such a large bandwidth all the time. For example, in an operation scenario where only low data rate transmission needs to be supported, such as WeChat chat, it is sufficient that the terminal device only needs to use a small operation bandwidth, for example, a bandwidth of 10 MHz. In order to flexibly support the different requirements of the different scenarios on bandwidth, the BWP concept is introduced in 5G. The BWP may be a part of a system bandwidth, for example, the system bandwidth is 100MHz, and the end device may use a bandwidth smaller than 100MHz, for example, BWP of 20MHz and 50MHz, to perform data transmission within the system bandwidth. Currently, it is supported to configure up to 4 BWPs to a terminal device simultaneously, and different BWPs may have different bandwidth sizes, different frequency locations, different subcarrier spacings, and so on. The network device may instruct the terminal device to switch between the BWPs according to the traffic requirements of the terminal device. For example, when the traffic transmission rate is high, the terminal device uses the BWP with a larger bandwidth, and when the traffic transmission rate is low, the terminal device uses the BWP with a smaller bandwidth.

The network device may indicate the BWP to be switched to the terminal device through a BWP indicator field (BWP indicator file) in the DCI that schedules 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, for example, the BWP indication field may be 0 bit (bit), 1bit or 2bit. The length of the BWP indication field may be set by

Is calculated, wherein n _BWP,RRC When n is less than or equal to 3, n _BWP ＝n _BWP,RRC +1, the BWP indication field is the same as the BWP ID of the higher layer parameter configuration), otherwise n _BWP ＝n _BWP,RRC At this time, the BWP indication field may be as shown in table one.

Watch 1

When the BWP of the terminal device needs to be switched, the network device carries the 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 equipment receives the DCI, the terminal equipment determines the BWP to be switched according to the value of the BWP indication domain, and therefore switching is executed.

Generally, a DCI format (format) carrying a BWP indication field sent by a network device to a terminal device may be DCI format 0-1 or DCI format 1-1. The DCI format 0-1 is used to schedule Uplink (UL) transmission, that is, the DCI format 0-1 is used to schedule Uplink grant (UL grant), and the BWP indication field in the DCI may be used to indicate the terminal device to perform Uplink BWP (UL BWP) switching. The DCI format 1-1 is used for scheduling Downlink (DL) transmission, that is, the DCI format 1-1 is used for Downlink scheduling (DL grant), and a BWP indication field in the DCI may be used to indicate a terminal device to perform Downlink BWP (DL BWP) switching.

The terminal equipment supports periodic CSI measurement and reporting and aperiodic CSI measurement and reporting. For 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. For aperiodic CSI measurement and reporting, the terminal device may perform aperiodic CSI-RS measurement according to configuration information of CSI-RS measurement sent by the network device, and report a measurement result to the network device. The configuration information of the CSI-RS measurement is used for indicating the CSI-RS which is transmitted by the network equipment in an aperiodic mode.

Since the terminal device can only perform CSI measurement on the currently active BWP, it cannot perform CSI measurement on other BWPs. Therefore, before the terminal device is handed over from the currently active BWP to another BWP, the terminal device cannot perform CSI measurement and report on the another 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 network device can only perform conservative estimation on the Channel condition of the terminal device on the other BWP to determine parameters such as coding rate. Only after the terminal device switches to the other BWP and the network device further instructs the terminal device to perform CSI measurement and report on the switched other BWP, the network device may match the channel condition of the terminal device based on the CSI measurement result on the BWP reported by the terminal device, thereby performing PDSCH scheduling.

It can be seen that, data scheduling performed by the network device before the terminal device switches from the currently activated BWP to another BWP and obtains the CSI measurement result on the other BWP may not match the channel condition of the terminal device, and therefore, the data transmission performance of the system is affected.

To this end, the present application provides a BWP switching method, which enables BWP switching of a terminal device not to affect data transmission performance of a system.

Fig. 2 is a schematic flowchart of a BWP switching method 200 according to an embodiment of the present application. The method described in fig. 2 may be performed by a terminal device, such as terminal device 120 shown in fig. 1, and a network device, such as network device 110 shown in fig. 1. As shown in fig. 2, the BWP switching method 200 may include some or all of the following steps. Wherein:

in 210, the network device sends a CSI measurement request message.

In 220, the terminal device receives the CSI measurement request message.

In 230, the terminal device determines whether to perform BWP handover according to the CSI measurement request message.

Wherein the CSI measurement request message includes configuration information of CSI measurement. The configuration information of the CSI measurement includes information of BWP where the CSI-RS for CSI measurement is located. The terminal device may determine whether to perform BWP switching according to information of the BWP in which the CSI Reference Signal (CSI-RS) is located.

Further, in an embodiment, the determining, by the terminal device, whether to perform the switching of the bandwidth part BWP according to the information of the BWP where the CSI-RS is located includes:

if the currently activated BWP is the same as the BWP where the CSI-RS is located, the terminal equipment determines not to perform BWP switching; and/or the presence of a gas in the atmosphere,

and if the currently activated BWP is different from the BWP where the CSI-RS is located, the terminal equipment determines to switch to the BWP where the CSI-RS is located.

That is, the configuration information of the CSI measurement includes information of the BWP where the CSI-RS is located. And the network equipment instructs the terminal equipment to execute the BWP switching through the information of the BWP where the CSI-RS is located. When the information of the BWP where the CSI-RS is located is different from the BWP currently used by the terminal device, the terminal device needs to switch to the BWP where the CSI-RS is located.

In an embodiment, when the terminal device determines to switch to the BWP where the CSI-RS is located, the terminal device switches to the BWP where the CSI-RS is located within a preset time length T after receiving the CSI measurement request message.

Wherein T is less than or equal to a time offset of the CSI-RS with respect to the CSI measurement request message, that is, T is less than or equal to a time duration from when the terminal device receives the CSI measurement request message to when it starts receiving the CSI-RS.

In order to enable the terminal device to complete the BWP switching before performing CSI measurement, a duration T may 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 a duration required by the terminal device to complete the BWP switching. The terminal equipment receives the CSI measurement request message, can complete BWP switching in the following time length T, and the initial transmission time of the CSI-RS is positioned at the BWP switching completion time or behind the BWP switching completion time.

The duration T may be pre-configured, for example, agreed by a protocol, or may be configured for the terminal device by the network device based on the capability of the terminal device, etc. T is related to BWP switching capability of the terminal device, subcarrier spacing of BWP, band location where BWP is located, and so on.

The network device does not expect the terminal device to transceive signals within the time duration T. The terminal device may not transmit or receive signals within the time period T. However, if the terminal device completes the handover within the time length T in advance, the signal may be transmitted and received within the remaining time within the time length T based on the implementation of the terminal device.

The configuration information of the CSI measurement may further include, for example, at least one of the following information: time offset of the CSI-RS relative to the CSI measurement request message, frequency band position of the CSI-RS, frequency domain resource density of the CSI-RS, and antenna port for transmitting the CSI-RS.

At this time, in one embodiment, the method further comprises: and the terminal equipment performs the CSI measurement on the BWP where the CSI-RS is located according to the configuration information of the CSI measurement.

Therefore, the terminal device can implement the switch of the BWP through the CSI measurement request message, and at this time, the terminal device can complete the CSI measurement and report on the switched BWP according to the CSI measurement request message, so that the data scheduled by the network device in the switched BWP can also match the channel condition of the terminal device, thereby improving the data transmission performance of the system.

The CSI measurement request message may be carried in Downlink Control Information (DCI) for scheduling an uplink data channel, for example, DCI in a format of DCI format 0-1; the CSI measurement request message may also be carried in DCI for scheduling a downlink data channel, for example, DCI with a format of DCI format 1-1.

The format of the DCI carrying the CSI measurement request message is not limited in any way in the embodiment of the present application, and the DCI may be any one of DCI format 0-0, DCI format 0-1, DCI format 1-0, DCI format 1-1, and the like.

When the DCI is used for uplink scheduling, for example, the format is DCI format 0-1, the DCI may further include: resource allocation information of a Physical Uplink Shared Channel (PUSCH) for reporting a CSI measurement result, and/or timing information for reporting a CSI measurement result.

Wherein 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, a frequency domain position of the PUSCH, symbol information occupied by the PUSCH in a slot, and the like.

At this time, in one embodiment, the method further comprises: and the terminal equipment reports the CSI measurement result according to the resource allocation information and/or the timing information of the PUSCH.

That is, 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 handover, and the resource allocation information of the PUSCH and/or the timing information may be used for the terminal device to report a CSI measurement result.

Since the CSI-RS is a downlink signal, the BWP where the CSI-RS is located is a downlink BWP. Therefore, the CSI measurement request message described in this embodiment may be used to indicate handover of downlink BWP. When the CSI-RS is carried in DCI for uplink scheduling, for example, DCI with a format of DCI format 0-1, the uplink BWP handover may be indicated by a BWP indication field in the DCI.

When the DCI is a DCI for downlink scheduling, for example, a DCI in a format of DCI format 1-1, since the DCI cannot schedule an uplink data channel, the terminal device cannot obtain an uplink resource for reporting a CSI measurement result. At this time, in an embodiment, the terminal device may report the CSI measurement result on a preconfigured PUSCH, for example, timing information between the PUSCH and the DCI, modulation Coding Mode (MCS), and other information are configured by a protocol convention or a network device; or, the terminal device may report a CSI measurement result on a periodically configured Physical Uplink Control Channel (PUCCH), for example, after the terminal device performs CSI measurement, the CSI measurement result may be fed back on a nearest available PUCCH Channel at the CSI measurement time. When the CSI measurement request message is carried in the DCI for downlink scheduling, if the DCI originally carries a BWP indication field for indicating downlink BWP handover, the BWP indication field may have other functions or may be omitted.

The following description is made with reference to fig. 3 and 4. For example, as shown in fig. 3, DL BWP 1 is a BWP currently activated by the terminal device, the terminal device receives a Physical Downlink Control Channel (PDCCH) on DL BWP 1, the PDCCH carries a DCI, and assuming that the format of the DCI is DCI format 0-1, a BWP indication field in the DCI may be used to indicate handover of an uplink BWP, and a CSI measurement request message in the DCI may be used to indicate handover of a Downlink BWP and CSI measurement. Meanwhile, the DCI also includes resource allocation information and timing information of the PUSCH, and is used for the terminal device to report a CSI measurement result.

As shown in fig. 3, the terminal device receives a PDCCH on DL BWP 1, where the PDCCH carries DCI, a CSI measurement request message in the DCI includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of BWP where CSI-RS is located. As can be seen from fig. 3, the BWP where the CSI-RS is sent by the network device is the same as the DL BWP 1 currently used by the terminal device, so the terminal device may not perform BWP handover.

Terminal equipment at time t ₁ After receiving the CSI request message, according to the configuration information of CSI measurement in the CSI request message, on DL BWP 1 from time t ₂ Starts to receive CSI-RS and according to the resource allocation information and timing information of PUSCH in the DCI, at time t ₃ And sending a CSI measuring result obtained according to the CSI-RS measurement to the network equipment on the PUSCH.

For another example, as shown in fig. 4, DL BWP 1 is the BWP currently activated by the terminal device, the terminal device receives the PDCCH on DL BWP 1, the PDCCH carries the DCI, and assuming that the format of the DCI is DCI format 0-1, the CSI measurement request message in the DCI may be used to indicate the switching of downlink BWP and CSI measurement. Meanwhile, the DCI also includes resource allocation information and timing information of the PUSCH, so that the terminal device reports a CSI measurement result.

As shown in fig. 4, the terminal device receives a PDCCH on DL BWP 1, where the PDCCH carries DCI, a CSI measurement request message in the DCI includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of BWP where CSI-RS is located. As can be seen from fig. 4, the BWP where the CSI-RS sent by the network device is located is DL BWP 2, which is different from the DL BWP 1 currently used by the terminal device, so that the terminal device needs to switch from DL BWP 1 to DL BWP 2.

Terminal equipment at time t ₁ After receiving the CSI request message, if the BWP where the CSI-RS is located is different from the BWP currently activated by the terminal equipment, the terminal equipment is switched from DL BWP 1 to DL BWP 2 within a preset time length T, and T is not more than T ₂ -t ₁ . After the switching is finished, the terminal equipment requests according to the CSIFinding configuration information for CSI measurement in a message, on DL BWP 2, from time t ₂ And starting to receive the CSI-RS. And the terminal equipment according to the resource allocation information and the timing information of the PUSCH in the DCI at the time t ₃ And sending the CSI measurement result obtained according to the CSI-RS measurement to the network equipment on the PUSCH.

By the above manner, the terminal device has completed BWP handover before performing CSI measurement, and therefore, the terminal device can perform CSI measurement on DL BWP 2 and report the measurement result to the network device. Then, the network device may schedule data channel transmission on DL BWP 2 based on the obtained measurement result, so that the scheduled data can match the channel condition of the terminal device, thereby improving the efficiency of data transmission, further reducing the power consumption of the terminal device, reducing the resource overhead, and increasing the system capacity.

The CSI-RS in the embodiment of the present application may be configured as a Tracking Reference Signal (TRS).

At this time, in one embodiment, the method may further include: and the terminal equipment carries out time-frequency tracking according to the TRS.

For example, as shown in fig. 5, DL BWP 1 is a BWP currently activated by the terminal device, the terminal device receives a PDCCH on DL BWP 1, the PDCCH carries DCI, and assuming that the format of the DCI is DCI format 0-1, the CSI measurement request message in the DCI may be used to indicate switching of downlink BWP and CSI measurement.

As shown in fig. 5, the terminal device receives a PDCCH on DL BWP 1, where the PDCCH carries DCI, a CSI measurement request message in the DCI includes configuration information of CSI measurement, and the configuration information of CSI measurement includes information of BWP where CSI-RS is located. The CSI-RS is configured as a TRS. As can be seen from fig. 5, the BWP where the network device transmits the TRS is DL BWP 2, which is different from the DL BWP 1 currently used by the terminal device, so that the terminal device needs to switch from DL BWP 1 to DL BWP 2.

Terminal equipment at time t ₁ After receiving the CSI request message, if the BWP where the CSI-RS, that is, the TRS, is located is different from the currently activated BWP of the terminal device, the terminal device switches from DL BWP 1 to D within the preset duration TL BWP 2，T≤t ₂ -t ₁ . After the switching is completed, the terminal device measures configuration information according to the CSI in the CSI request message, and the terminal device starts to switch from time t on DL BWP 2 ₂ And starting to receive the TRS, thereby realizing time-frequency tracking according to the TRS. The measurement result of the TRS is not required to be reported to the network device.

The terminal device has completed the BWP handover before performing TRS measurement, and thus, the terminal device can perform TRS measurement on DL BWP 2 and perform time-frequency tracking using the TRS. After that, the terminal device can achieve more accurate and stable data reception on DL BWP 2, improving the data transmission performance of the system.

In an embodiment, when the method described in this embodiment is applied to a Frequency Division Duplex (FDD) system, the switching of the BWP includes switching of a downlink BWP; when the method is applied to a Time Division Duplex (TDD) system, the switching of BWP includes switching of downlink BWP and switching of uplink BWP.

This is because, in the FDD system, switching of UL BWP and switching of DL BWP are mutually independent processes, i.e., switching of DL BWP does not affect switching of UL BWP. For TDD systems, each DL BWP has a bound UL BWP, and therefore switching of DL BWPs results in switching of corresponding UL BWPs. When the terminal device of the TDD system performs DL BWP handover according to the CSI measurement request message, the associated UL BWP also needs to be handed over.

In this embodiment, the terminal device can complete CSI measurement and reporting, and complete TRS measurement and time-frequency tracking at the same time according to the CSI measurement request message, thereby improving the data transmission performance of the system to the maximum extent.

It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Having described the communication method according to the embodiment of the present application in detail above, an apparatus according to the embodiment of the present application will be described below with reference to fig. 6 to 10, and the technical features described in the method embodiment are applicable to the following apparatus embodiments.

Fig. 6 is a schematic block diagram of a terminal device 600 according to an embodiment of the present application. As shown in fig. 6, the terminal apparatus 600 includes: a transceiving unit 610 and a processing unit 620. Wherein:

the transceiving unit 610 is configured to: receiving a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of BWP where a CSI-RS used for the CSI measurement is located.

The processing unit 620 is configured to: and determining whether to switch the BWP of the bandwidth part according to the information of the BWP where the CSI-RS is received by the transceiver unit.

In an embodiment, 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, determining that the BWP is not switched; and/or determining to switch to the BWP where the CSI-RS is located if the currently activated BWP is different from the BWP where the CSI-RS is located.

In one embodiment, the processing unit 620 is further configured to: and if the switching to the BWP where the CSI-RS is located is determined, switching to the BWP where the CSI-RS is located within a preset time length T after the CSI measurement request message is received, wherein T is smaller than or equal to the time offset of the CSI-RS relative to the CSI measurement request message.

In an embodiment, the terminal device does not transmit or receive signals within the preset time period T.

In one embodiment, the configuration information of the CSI measurement further includes at least one of the following information: time offset of the CSI-RS relative to the CSI measurement request message, frequency band position of the CSI-RS, frequency domain resource density of the CSI-RS, and antenna port for transmitting the CSI-RS.

In one embodiment, the processing unit 620 is further configured to: and according to the configuration information of the CSI measurement, the CSI measurement is carried out on the BWP where the CSI-RS is located.

In one embodiment, the CSI measurement request message is carried in DCI for scheduling an uplink data channel.

In one embodiment, the DCI is a DCI format 0-1.

In one embodiment, the DCI further comprises: and the resource allocation information of the physical shared uplink channel PUSCH is used for reporting the CSI measurement result, and/or the timing information is used for reporting the CSI measurement result.

In one embodiment, the timing information includes at least one of the following: a timing difference between the PUSCH and the CSI-RS, a timing difference between the PUSCH and the CSI measurement request message.

In one embodiment, the transceiver unit 610 is further configured to: and reporting the CSI measurement result according to the resource allocation information and/or the timing information of the PUSCH.

In an embodiment, the CSI measurement request message is carried in DCI for scheduling a downlink data channel.

In one embodiment, the DCI is DCI format 1-1.

In one embodiment, the transceiver unit 610 is further configured to: and reporting the CSI measurement result on a pre-configured PUSCH.

In one embodiment, the transceiver unit 610 is further configured to: and reporting the CSI measurement result on a periodically configured Physical Uplink Control Channel (PUCCH).

In one embodiment, the CSI-RS is configured to track a reference signal TRS.

In one embodiment, the processing unit 620 is further configured to: and performing time-frequency tracking according to the TRS.

In an embodiment, when the terminal device is applied to a frequency division duplex FDD system, the switching of BWP includes switching of downlink BWP.

In one embodiment, when the terminal device is applied to a TDD system with time division duplex, the switching of BWP includes switching of downlink BWP and switching of uplink BWP.

It should be understood that the terminal device 600 may perform corresponding operations performed by the terminal device in the method 200, and therefore, for brevity, will not be described herein again.

Fig. 7 is a schematic block diagram of a network device 700 according to an embodiment of the present application. As shown in fig. 7, the network device 700 includes: a processing unit 710 and a transceiving unit 720. Wherein:

a processing unit 710, configured to generate a CSI measurement request message, where the CSI measurement request message includes configuration information of CSI measurement, the configuration information of CSI measurement includes information of a BWP where a CSI-RS used for the CSI measurement is located, and the information of the BWP where the CSI-RS is located is used for a terminal device to determine whether to perform switching of a bandwidth part BWP;

a transceiver unit 720, configured to send the CSI measurement request message.

In an embodiment, the information of the BWP where the CSI-RS is located is used for 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.

In an embodiment, the configuration information of the CSI measurement is further used for the terminal device to perform the CSI measurement on a BWP where the CSI-RS is located.

In one embodiment, the DCI is DCI format 0-1.

In an embodiment, the resource allocation information and/or the timing information of the PUSCH is used for the terminal device to report the CSI measurement result.

In one embodiment, the DCI is DCI format 1-1.

In one embodiment, the transceiving unit 720 is further configured to: and sending indication information, wherein the indication information is used for indicating a periodically configured Physical Uplink Control Channel (PUCCH), and the periodically configured PUCCH is used for the terminal equipment to report the CSI measurement result.

In one embodiment, the CSI-RS is configured to track a reference signal, TRS, used by the terminal device for time-frequency tracking.

In one embodiment, when the network device is applied to a frequency division duplex FDD system, the switching of BWP includes switching of downlink BWP.

In one embodiment, when the network device is applied to a time division duplex TDD system, the switching of BWPs includes switching of downlink BWPs and switching of uplink BWPs.

It should be understood that the network device 700 can perform the corresponding operations performed by the network device in the method 200, and therefore, for brevity, the description is not repeated herein.

Fig. 8 is a schematic structural diagram of a communication device 800 according to an embodiment of the present application. The communication device 800 shown in fig. 8 comprises a processor 810, and the processor 810 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

In one implementation, as shown in fig. 8, the communication device 800 may also include a memory 820. From the memory 820, the processor 810 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 820 may be a separate device from the processor 810 or may be integrated into the processor 810.

In one embodiment, as shown in fig. 8, the communication device 800 may further include a transceiver 830, and the processor 810 may control the transceiver 830 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 830 may include a transmitter and a receiver, among others. The transceiver 830 may further include antennas, and the number of antennas may be one or more.

In an implementation manner, the communication device 800 may specifically be a terminal device in the embodiment of the present application, and the communication device 800 may implement a corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

In an implementation manner, the communication device 800 may specifically be a network device in the embodiment of the present application, and the communication device 800 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Fig. 9 is a schematic structural diagram of a chip of the 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 a memory to implement the method in the embodiment of the present application.

In one embodiment, as shown in FIG. 9, chip 900 may also include memory 920. From the memory 920, the processor 910 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 920 may be a separate device from the processor 910, or may be integrated in the processor 910.

In one embodiment, the chip 900 may also include an input interface 930. The processor 910 may control the input interface 930 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

In one embodiment, the chip 900 may also include an output interface 940. The processor 910 may control the output interface 940 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

In an implementation manner, the chip may be applied to the terminal device in this embodiment, and the chip may implement a corresponding process implemented by the terminal device in each method in this embodiment, which is not described herein again for brevity.

In an implementation manner, the chip may be applied to the network device in this embodiment, and the chip may implement a corresponding process implemented by the network device in each method in this embodiment, which is not described herein again for brevity.

The chip described in the embodiments of the present application may also be referred to as a system-on-chip, or a system-on-chip.

The processor in the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A 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 connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware thereof to complete the steps of the method.

The memory in the embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The above memory is an exemplary but not limiting illustration, for example, the memory in the embodiment of the present application may also be Static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), double Data Rate Synchronous Dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced Synchronous SDRAM (Enhanced SDRAM, ESDRAM), synchronous Link DRAM (Synchronous Link DRAM, SLDRAM), direct bus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

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: and sending a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of BWP where a CSI-RS for the CSI measurement is located.

The terminal device 1020 is configured to: receiving a CSI measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of a BWP where a CSI-RS for the CSI measurement is located; and determining whether to switch the bandwidth part BWP according to the information of the BWP where the CSI-RS is located.

In an embodiment, the network device 1010 may be configured to implement corresponding functions implemented by the terminal device in the method 200, and the composition of the terminal device 1010 may be as shown in the terminal device 600 in fig. 6, which is not described herein again for brevity.

In an embodiment, the terminal device 1020 may be configured to implement corresponding functions implemented by the network device in the method 200, and the composition of the network device 1020 may be as shown in the network device 700 in fig. 7, which is not described herein again for brevity.

An embodiment of the present application further provides a computer-readable storage medium for storing a computer program. In an implementation manner, the computer-readable storage medium may be applied to a network device in the embodiment of the present application, and the computer program enables a computer to execute a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described again for brevity. In an implementation manner, the computer-readable storage medium may be applied to the terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described again for brevity.

Embodiments of the present application also provide a computer program product, including computer program instructions. In an implementation manner, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity. In an implementation manner, the computer program product may be applied to a terminal device in the embodiment of the present application, and the computer program instructions enable a computer to execute a corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

The embodiment of the application also provides a computer program. In an implementation manner, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which is not described herein again for brevity. In an implementation manner, the computer program may be applied to the terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute corresponding processes implemented by the terminal device in the methods in the embodiment of the present application, which is not described herein again for brevity.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The terms "system" and "network" in embodiments of the present invention are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiment of the present invention, "B corresponding to (corresponding to) a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the unit is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for bandwidth part BWP handover, the method comprising:

the method comprises the steps that terminal equipment receives a Channel State Information (CSI) measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, and the configuration information of the CSI measurement comprises information of BWP where a channel state information reference signal (CSI-RS) used for the CSI measurement is located;

the terminal equipment determines whether to switch the BWP of a bandwidth part according to the information of the BWP where the CSI-RS is located, which is included in the CSI measurement request message;

wherein, the determining, by the terminal device, whether to perform the switching of the bandwidth part BWP according to the information of the BWP where the CSI-RS is located, which is included in the CSI measurement request message, includes:

if the currently activated BWP is the same as the BWP where the CSI-RS is located, the terminal device determines not to switch the BWP;

2. The method of claim 1, further comprising:

if the terminal equipment determines to switch to the BWP where the CSI-RS is located, the terminal equipment switches to the BWP where the CSI-RS is located within a preset time length T after the CSI measurement request message is received, wherein T is smaller than or equal to the time offset of the CSI-RS relative to the CSI measurement request message.

3. The method according to claim 2, wherein the terminal device does not perform signal transceiving for the preset duration T.

4. The method of claim 1, wherein the configuration information of the CSI measurement further comprises at least one of the following information:

time offset of the CSI-RS relative to the CSI measurement request message, frequency band position of the CSI-RS, frequency domain resource density of the CSI-RS, and antenna port for transmitting the CSI-RS.

5. The method of claim 4, further comprising:

and the terminal equipment performs the CSI measurement on the BWP where the CSI-RS is located according to the configuration information of the CSI measurement.

6. The method of claim 1, wherein the CSI measurement request message carries downlink control information, DCI, used for scheduling an uplink data channel.

7. The method of claim 6, wherein the DCI is a DCI format 0-1.

8. The method of claim 6, wherein the DCI further comprises:

and the resource allocation information of the physical shared uplink channel PUSCH is used for reporting the CSI measurement result, and/or the timing information is used for reporting the CSI measurement result.

9. The method of claim 8, wherein the timing information comprises at least one of:

a timing difference between the PUSCH and the CSI-RS, a timing difference between the PUSCH and the CSI measurement request message.

10. The method of claim 8, further comprising:

and the terminal equipment reports the CSI measurement result according to the resource allocation information and/or the timing information of the PUSCH.

11. The method of claim 1, wherein the CSI measurement request message carries DCI for scheduling a downlink data channel.

12. The method of claim 11, wherein the DCI is DCI format 1-1.

13. The method of claim 11, further comprising:

and the terminal equipment reports the CSI measurement result on a pre-configured PUSCH.

14. The method of claim 11, further comprising:

and the terminal equipment reports the CSI measurement result on a periodically configured Physical Uplink Control Channel (PUCCH).

15. The method according to any of claims 1-14, wherein the CSI-RS is configured to track reference signals, TRSs.

16. The method of claim 15, further comprising:

and the terminal equipment carries out time-frequency tracking according to the TRS.

17. Method according to any of claims 1 to 14, wherein the switching of BWP comprises switching of downlink BWP when the method is applied in a frequency division duplex FDD system.

18. The method according to any of claims 1 to 14, wherein when the method is applied to a TDD system, the switching of BWP comprises switching of downlink BWP and switching of uplink BWP.

19. A method for bandwidth part BWP handover, the method comprising:

the method comprises the steps that a network device sends a Channel State Information (CSI) measurement request message, wherein the CSI measurement request message comprises configuration information of CSI measurement, the configuration information of the CSI measurement comprises information of a bandwidth part (BWP) where a channel state information reference signal (CSI-RS) used for the CSI measurement is located, and the information of the BWP where the CSI-RS is located, which is contained in the CSI measurement request message, is used for a terminal device to determine whether to switch the BWP of the bandwidth part;

the information of the BWP where the CSI-RS is located, which is included in the CSI measurement request message, is used for the terminal device to determine that the switching of the BWP is not performed when the currently activated BWP is the same as the BWP where the CSI-RS is located; and switching 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.

20. The method of claim 19, wherein the configuration information of the CSI measurement further comprises at least one of the following information:

21. The method of claim 20, wherein the configuration information of the CSI measurement is further used for the terminal device to perform the CSI measurement on a BWP where the CSI-RS is located.

22. The method of claim 19, wherein the CSI measurement request message carries downlink control information, DCI, for scheduling an uplink data channel.

23. The method of claim 22, wherein the DCI is DCI format 0-1.

24. The method of claim 22, wherein the DCI further comprises:

25. The method of claim 24, wherein the timing information comprises at least one of:

26. The method of claim 24, wherein the resource allocation information of the PUSCH and/or the timing information is used for reporting the CSI measurement result by the terminal device.

27. The method of claim 19, wherein the CSI measurement request message carries DCI for scheduling a downlink data channel.

28. The method of claim 27, wherein the DCI is DCI format 1-1.

29. The method according to any of claims 19-28, wherein the CSI-RS is configured as a tracking reference signal, TRS, for time-frequency tracking by the terminal device.

30. Method according to any of claims 19 to 28, wherein the switching of BWP comprises switching of downlink BWP when the method is applied in a frequency division duplex FDD system.

31. The method according to any of claims 19 to 28, wherein when the method is applied to a TDD system, the switching of BWP comprises switching of downlink BWP and switching of uplink BWP.

32. A terminal device, characterized in that the terminal device comprises:

a receiving and sending unit, 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 a CSI-RS for the CSI measurement is located;

the processing unit is used for determining whether to switch the bandwidth part BWP according to the information of the BWP where the CSI-RS is located, which is contained in the CSI-RS received by the transceiving unit;

wherein the processing unit is specifically configured to:

if the currently activated BWP is the same as the BWP where the CSI-RS is located, determining that the BWP is not switched;

and if the currently activated BWP is different from the BWP where the CSI-RS is located, determining to switch to the BWP where the CSI-RS is located.

33. The terminal device of claim 32, wherein the processing unit is further configured to:

and if the switching to the BWP where the CSI-RS is located is determined, switching to the BWP where the CSI-RS is located within a preset time length T after the CSI measurement request message is received, wherein T is smaller than or equal to the time offset of the CSI-RS relative to the CSI measurement request message.

34. The terminal device of claim 33, wherein the terminal device does not transceive signals for the preset duration T.

35. The terminal device of claim 32, wherein the configuration information of the CSI measurement further comprises at least one of the following information:

36. The terminal device of claim 35, wherein the processing unit is further configured to:

and according to the configuration information of the CSI measurement, the CSI measurement is carried out on the BWP where the CSI-RS is located.

37. The terminal device of claim 32, wherein the CSI measurement request message carries downlink control information, DCI, used for scheduling an uplink data channel.

38. The terminal device of claim 37, wherein the DCI is DCI format 0-1.

39. The terminal device of claim 37, wherein the DCI further comprises:

40. The terminal device of claim 39, wherein the timing information comprises at least one of:

41. The terminal device of claim 39, wherein the transceiving unit is further configured to:

and reporting the CSI measurement result according to the resource allocation information and/or the timing information of the PUSCH.

42. The terminal device of claim 32, wherein the CSI measurement request message carries DCI for scheduling a downlink data channel.

43. The terminal device of claim 42, wherein the DCI is in DCI format 1-1.

44. The terminal device of claim 42, wherein the transceiver unit is further configured to:

and reporting the CSI measurement result on a pre-configured PUSCH.

45. The terminal device of claim 42, wherein the transceiver unit is further configured to:

and reporting the CSI measurement result on a periodically configured Physical Uplink Control Channel (PUCCH).

46. The terminal device according to any of claims 32 to 45, wherein the CSI-RS is configured to track a reference signal, TRS.

47. The terminal device of claim 46, wherein the processing unit is further configured to:

and performing time-frequency tracking according to the TRS.

48. The terminal device according to any of claims 32 to 45, wherein the switching of BWP comprises switching of downlink BWP when the terminal device is applied to a frequency division duplex, FDD, system.

49. The terminal device according to any of claims 32 to 45, wherein when the terminal device is applied to a TDD system, the switching of BWP comprises switching of downlink BWP and switching of uplink BWP.

50. A network device, characterized in that the network device comprises:

the terminal equipment comprises a processing unit and a processing unit, wherein the processing unit is used for generating a Channel State Information (CSI) measurement request message, the CSI measurement request message comprises configuration information of CSI measurement, the configuration information of the CSI measurement comprises information of a bandwidth part (BWP) where a CSI-RS (channel state information reference signal) used for the CSI measurement is located, and the information of the BWP where the CSI-RS is located, which is contained in the CSI measurement request message, is used for the terminal equipment to determine whether to switch the BWP of the bandwidth part;

a transceiving unit, configured to transmit the CSI measurement request message;

51. The network device of claim 50, wherein the configuration information of the CSI measurement further comprises at least one of the following information:

52. The network device of claim 51, wherein the configuration information of the CSI measurement is further used for the terminal device to perform the CSI measurement on a BWP where the CSI-RS is located.

53. The network device of claim 50, wherein the CSI measurement request message carries Downlink Control Information (DCI) for scheduling an uplink data channel.

54. The network device of claim 53, wherein the DCI is in DCI format 0-1.

55. The network device of claim 53, wherein the DCI further comprises:

56. The network device of claim 55, wherein the timing information comprises at least one of:

57. The network device of claim 55, wherein the resource allocation information of the PUSCH and/or the timing information is used for the terminal device to report the CSI measurement result.

58. The network device of claim 50, wherein the CSI measurement request message carries DCI for scheduling a downlink data channel.

59. The network device of claim 58, wherein the DCI is in DCI format 1-1.

60. The network device of any one of claims 50-59, wherein the CSI-RS is configured to track a reference signal (TRS) used by the terminal device for time-frequency tracking.

61. The network device according to any of claims 50 to 59, wherein the switching of BWP comprises switching of downlink BWP when the network device is applied in a frequency division duplex, FDD, system.

62. The network device according to any of claims 50 to 59, wherein when the network device is applied to a time division Duplex, TDD, system, the switching of BWP comprises switching of downlink BWP and switching of uplink BWP.

63. A terminal device, characterized in that the terminal device comprises a processor and a memory for storing a computer program, the processor being adapted to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 18.

64. A network device comprising a processor and a memory, the memory storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any one of claims 19 to 31.

65. A chip, characterized in that it comprises a processor for calling and running a computer program from a memory, so that a device in which the chip is installed performs the method of any one of claims 1 to 18.

66. A chip, characterized in that it comprises a processor for calling up and running a computer program from a memory, so that a device in which the chip is installed performs the method of any of claims 19 to 31.

67. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 18.

68. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 19 to 31.

69. A communication system, comprising: the terminal device of any one of claims 32 to 49; and a network device as claimed in any one of claims 50 to 62.