CN112583544A

CN112583544A - Method and communication device for determining source reference signal information

Info

Publication number: CN112583544A
Application number: CN201910927115.8A
Authority: CN
Inventors: 杨宇; 孙鹏
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-03-30
Anticipated expiration: 2039-09-27
Also published as: CN112583544B

Abstract

The embodiment of the invention provides a method for determining source reference signal information and communication equipment, wherein the method comprises the following steps: if the first BWP is switched to a second BWP, and a second reference signal resource is configured in the second BWP, the second reference signal resource is used as a source reference signal of a target channel or a source reference signal of a target reference signal after the switching, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is a source reference signal of the target channel or a source reference signal of the target reference signal before the switching. In the embodiment of the invention, when the BWP switching occurs, the second reference signal resource is directly used as the source reference signal of the target channel or the source reference signal of the target reference signal, so that the beam training overhead and the signaling overhead increased when the BWP switching is frequent can be reduced.

Description

Method and communication device for determining source reference signal information

Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to a method and communication equipment for determining source reference signal information.

Background

(1) Beam measurement and reporting (Beam measurement and Beam reporting) in New Radio (NR)

In the process of formulating the standard of the NR communication system by the 3GPP, the working frequency band supported by the system is increased to more than 6 GHz. The high frequency band has richer idle frequency resources, and can provide higher throughput for data transmission. The wavelength of the high-frequency signal is short, more antenna array elements can be arranged on a panel with the same size compared with a low-frequency band, and a beam with stronger directivity and narrower lobes is formed by utilizing a beam forming technology.

Analog beamforming is full bandwidth transmit and each polar array element on the panel of each high frequency antenna array can only transmit analog beams in a time division multiplexed manner. The shaping weight of the analog beam is realized by adjusting parameters of equipment such as a radio frequency front end phase shifter and the like.

At present, in academic and industrial fields, a polling method is usually used to train an analog beamforming vector, that is, an array element in each polarization direction of each antenna panel sequentially sends a training signal (i.e., a candidate beamforming vector) at an appointed time in a time division multiplexing manner, and a terminal feeds back a beam report after measurement, so that a network side can implement analog beam transmission by using transmission parameters of a selected training signal when transmitting a control channel or a data channel next time. The content of the beam report generally includes an optimal number of transmission beam identifiers (e.g., reference signal resource identifiers) and a measured received power of each reported transmission beam (i.e., a received power corresponding to the reported reference signal resource identifier).

(2) Mechanism relating to beam indication (beam indication)

After the beam measurement and the beam report, the network side may perform beam indication on the downlink and uplink channels or reference signals, so as to establish a beam link between the network side and a terminal (UE), thereby implementing transmission of the channels or the reference signals.

The beam indication of the channel or the reference signal includes transmission configuration indication state (TCI state) information or spatial relationship (spatial relationship) information configured or indicated by downlink signaling, the TCI state information or the spatial relationship information includes information of a source reference signal, and the network side may select a certain Reference Signal (RS) as the source reference signal based on a reference signal resource in the beam report. The terminal may determine on which beam to receive the channel or reference signal based on the source reference signal.

(3) Regarding the bandwidth Part (Band Width Part, BWP)

In NR Rel-15, the maximum channel bandwidth (channel bandwidth) per carrier is 400 MHz. But considering the UE capability, the maximum bandwidth supported by the UE may be less than 400MHz, and the UE may operate on multiple small BWPs. Each bandwidth part corresponds to one set of null parameters (Numerology), bandwidth, frequency location (frequency location). For a Frequency Division Duplex (FDD) system or a paired spectrum (paired spectrum), the network side configures at most four downlink BWPs and at most four uplink BWPs for the UE. For a Time Division Duplex (TDD) system or an unpaired spectrum (unpaired spectrum), the network side configures up to four downlink/uplink (DL/UL) BWP pairs (pair) for the UE. The center carrier frequency of DL BWP and UL BWP in each DL/UL BWP pair is the same. In addition, each UE will have a default DL BWP, or default DL/UL BWP pair. The default DL BWP or default DL/UL BWP pair is usually a BWP with a relatively small bandwidth, and when the UE does not receive data for a long time or detects a PDCCH, the UE switches from the active BWP to the default DL BWP or default DL/UL BWP pair through a timer (timer), thereby achieving the power saving effect. The BWP handover activation is implemented by Radio Resource Control (RRC) or Downlink Control Information (DCI) or a timer, for example, DCI on a first Control Resource set (CORESET) indicates the UE to handover to a second CORESET, and the BWP where the CORESET is located is an active BWP after the UE is handed over to the second CORESET. CORESET per BWP per cell is at most 3.

For the beam indication of the channel or the reference signal, the network selects a certain RS as the source reference signal according to the beam measurement and the beam report on the active BWP, and the RS is determined as the source reference signal.

When BWP switching occurs, the original BWP becomes inactive (inactive) BWP and the new BWP becomes active BWP. At this time, if the original RS on the original BWP is still used as the source reference signal, the UE cannot continuously track the beam information of the original RS any more because the UE does not work on the inactive BWP, so that the channel or reference signal using the original RS as the source reference signal cannot update the beam information in time. Then, beam measurement and beam report are needed to be performed on the new active BWP, the source reference signal in the TCI state or spatial relationship of the channel or reference signal is re-determined, and the UE is notified by means of RRC signaling reconfiguration or MAC CE command reactivation or DCI signaling re-indication, which may increase the beam training overhead and signaling overhead when BWP handover is frequent.

Disclosure of Invention

Embodiments of the present invention provide a method and a communication device for determining source reference signal information, which are used to solve the problem of how to determine a source reference signal of a channel or a reference signal during BWP handover, so as to reduce beam training overhead and signaling overhead caused by BWP handover.

In order to solve the technical problem, the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a method for determining source reference signal information, which is applied to a communication device, and includes:

if the first bandwidth part BWP is switched to a second BWP, and a second reference signal resource is configured in the second BWP, the second reference signal resource is used as a source reference signal of a target channel or a source reference signal of a target reference signal after the switching, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is the source reference signal of the target channel or the source reference signal of the target reference signal before the switching.

In a second aspect, an embodiment of the present invention provides a communication device, including:

a processing module, configured to, if a handover is made from a first BWP to a second BWP and a second reference signal resource is configured in the second BWP, use the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal after the handover, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is a source reference signal of the target channel or a source reference signal of the target reference signal before the handover.

In a third aspect, an embodiment of the present invention provides a communication device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the method for determining source reference signal information described above.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above method for determining source reference signal information.

In the embodiment of the present invention, when BWP handover occurs, if a new BWP configures a second reference signal resource, where the second reference signal resource is the same as an identifier of a first reference signal resource of a BWP activated before the handover, and the first reference signal resource is used as a source reference signal of a target channel or a source reference signal of a target reference signal before the handover, beam training is not required again, the source reference signal of the target channel or the source reference signal of the target reference signal is determined again, and only the second reference signal resource is used as the source reference signal of the target channel or the source reference signal of the target reference signal to determine beam information of the target channel or the target reference signal, so that beam training overhead and signaling overhead increased when BWP handover is frequent can be reduced.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a block diagram of a wireless communication system according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for determining source reference signal information according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a communication device according to another embodiment of the present invention.

Detailed Description

The terms "comprises," "comprising," or any other variation thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means that at least one of the connected objects, such as a and/or B, means that three cases, a alone, B alone, and both a and B, exist.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Embodiments of the present invention are described below with reference to the accompanying drawings. The method for determining the source reference signal information and the communication equipment provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may adopt a 5G system, or an Evolved Long Term Evolution (lte) system, or a subsequent Evolved communication system.

Referring to fig. 1, an architecture diagram of a wireless communication system according to an embodiment of the present invention is shown. As shown in fig. 1, the wireless communication system may include: a network side device 11 and a terminal 12, wherein the terminal 12 can be connected with the network side device 11. In practical applications, the connections between the above devices may be wireless connections, and fig. 1 illustrates the connections between the devices by solid lines for convenience and convenience in visual representation.

It should be noted that the communication system may include a plurality of terminals 12, and the network side device 11 may communicate (transmit signaling or transmit data) with the plurality of terminals 12.

The network side device 11 provided in the embodiment of the present invention may be a base station, which may be a commonly used base station, an evolved node base station (eNB), or a network side device in a 5G system (for example, a next generation base station (gNB), a Transmission and Reception Point (TRP), or a cell) and the like. Or a network side device in a subsequent evolution communication system. The terms are not intended to be limiting.

The terminal 12 provided in the embodiment of the present invention may be a Mobile phone, a tablet Computer, a notebook Computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like. Those skilled in the art will recognize that the words are not limiting.

First, a beam indication (beam indication) mechanism will be described.

(1) Beam indication for Physical Downlink Control Channel (PDCCH)

For the beam indication of the PDCCH, the network side configures K transmission configuration indication states (TCI states) for each control resource set (CORESET) using RRC signaling, and when K >1, 1 TCI state is indicated by the MAC CE, and when K is 1, no additional MAC CE command is needed. When monitoring the PDCCH, the UE monitors the PDCCH using the same Quasi-co-location (QCL) information, i.e., the same TCI state, for all search spaces (search spaces) in the CORESET. The source reference signals (e.g., periodic CSI-RS resource, semi-persistent CSI-RS resource, SS block, etc.) in the TCI state are spatially QCL with the UE-specific PDCCH DMRS port. The UE can know which receiving beam is used to receive the PDCCH according to the TCI status.

(2) Beam indication for Physical Downlink Shared Channel (PDSCH)

For the beam indication of PDSCH, the network side configures M TCI states through RRC signaling, and then activates 2 by using MAC CE command^NA TCI state, and then a TCI state in which a source reference signal is QCL with a DMRS port of a PDSCH to be scheduled is indicated by an N-bit TCI field of the DCI. The UE can know which receiving beam is used to receive the PDSCH according to the TCI status.

(3) Beam indication for channel state information reference signal (CSI-RS)

For the beam indication of the CSI-RS, when the type of the CSI-RS is periodic CSI-RS, the network side configures QCL information for CSI-RS resource through RRC signaling. When the CSI-RS type is the semi-persistent CSI-RS, the network side activates one CSI-RS resource from the RRC-configured CSI-RS resource set through a MAC CE command to indicate QCL information of the CSI-RS resource. And when the CSI-RS type is the aperiodic CSI-RS, the network side configures QCL information for the CSI-RS resource through RRC signaling and triggers the CSI-RS by using the DCI.

As an example of the above-mentioned TCI-State configuration information, 2 QCL-types may be included in the TCI-State, where each QCL-Type corresponds to a source reference Signal (reference Signal), and a cell and a BWP where the source reference Signal is located.

(4) Beam indication for Physical Uplink Control Channel (PUCCH)

For the beam indication of the PUCCH, the network side configures spatial relationship information (spatial relationship information) for each PUCCH resource by using an RRC signaling through parameter PUCCH-spatial relationship info, and when there are a plurality of spatial relationship information configured for the PUCCH resource, the network side indicates one of the spatial relationship information by using a MAC-CE. When the spatial relationship information configured for PUCCH resource contains only 1, no additional MAC CE command is required.

As an example of the spatial relationship configuration information, the BWP information is also included in the source reference Signal (reference Signal) of the spatial relationship.

(5) Beam indication for Physical Uplink Shared Channel (PUSCH)

For the beam indication of the PUSCH, the spatial relationship information of the PUSCH is that when the DCI carried by the PDCCH schedules the PUSCH, each SRI code of a sounding reference Signal Resource Indicator (SRI) field in the DCI indicates one SRI, which indicates the spatial relationship of the PUSCH.

(6) Beam indication for Sounding Reference Signal (SRS)

For the beam indication of the SRS, when the SRS type is periodic SRS, the network configures a spatial relationship for SRS resource through RRC signaling. When the SRS type is semi-persistent SRS, the network activates one from a set of spatial relationships configured by RRC through a MAC CE command. When the SRS type is the aperiodic SRS, the network configures a spatial relationship for the SRS resource through RRC signaling.

In the embodiment of the present invention, the source reference signal may also be referred to as source RS or reference signal. The source reference signal information is in RRC signaling parameter TCI-state or spatial relationship information (spatial relationship info), wherein the parameter TCI-state is used for configuring QCL relationship between the source reference signal and the target downlink channel or the target downlink reference signal; the parameter spatial relationship information is used for configuring the spatial relationship between the source reference signal and the target uplink channel or the target uplink reference signal.

Referring to fig. 2, fig. 2 is a flowchart illustrating a method for determining source reference signal information according to an embodiment of the present invention, where the method is applied to a communication device, and the method includes:

step 21: if the first BWP is switched to a second BWP, and a second reference signal resource is configured in the second BWP, the second reference signal resource is used as a source reference signal of a target channel or a source reference signal of a target reference signal after the switching, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is a source reference signal of the target channel or a source reference signal of the target reference signal before the switching.

In the embodiments of the present invention, since different BWPs are allowed to configure reference signal resources with the same identifier, and the same reference signal resources are identified, which may be at least partially the same, and may have the same channel characteristics if the resources are the same, in order to reduce the beam training overhead and the signaling overhead, if the BWP after handover configures reference signal resources with the same identifier as the BWP before handover and the reference signal resources of the BWP before handover are used as the source reference signals of the source reference signals or the target reference signals of the target channel, the reference signal resources with the same identifier of the BWP after handover may be directly used as the source reference signals or the source reference signals of the target channel.

The communication device in the embodiment of the present invention may be a terminal, or may be a network side device. That is, if BWP handover is performed, the terminal and the network side only need to use the second reference signal resource as the source reference signal of the target channel or the source reference signal of the target reference signal to determine the beam information of the target channel or the target reference signal, so as to reduce the beam training overhead and signaling overhead increased when BWP handover is frequent.

The following description is directed to methods performed by the terminal and the network side device for determining the source reference signal information, respectively.

One, terminal

In some embodiments of the present invention, optionally, the first reference signal resource and the second reference signal resource are the same reference signal resource. The two are the same reference signal resource, and have the same channel characteristics, so the switched BWP can directly use the same reference signal resource as the source reference signal of the target channel or the source reference signal of the target reference signal.

In some embodiments of the present invention, optionally, the first reference signal resource is partially identical to the second reference signal resource.

Of course, in some embodiments of the present invention, the first reference signal resource and the second reference signal resource may be completely different.

In some embodiments of the present invention, optionally, the first reference signal resource is a reference signal resource in a first reference signal resource set of the first BWP; the second reference signal resource is a reference signal resource in a second set of reference signal resources of the second BWP.

For example, the identity of the CSI-RS resource ID in CSI-RS resource set 1 on BWP1 is the same as the identity of the CSI-RS resource ID in CSI-RS resource set 2 on BWP 2.

In some embodiments of the present invention, optionally, before switching from the first BWP to the second BWP, the method further includes:

step 201A: receiving configuration information of a reference signal resource set of a plurality of BWPs, the plurality of BWPs including the first BWP and a second BWP, the reference signal resource set of the plurality of BWPs including at least one same reference signal resource identity. In the embodiment of the present invention, the network side may configure the reference signal resource set on each BWP for the terminal through RRC signaling.

Optionally, the set of reference signal resources includes at least one of:

a set of CSI-RS resources;

a set of SSB resources;

a set of SRS resources.

The CSI-RS resource set and the SSB resource set are reference signal resource sets on downlink BWP, and the SRS is reference signal resource sets on uplink BWP.

The above reference signal resource sets are all used for beam management (beam management).

step 202A: receiving beam indication information, where the beam indication information includes at least one of information of a source reference signal and an identifier of a BWP where the source reference signal is located, where the information of the source reference signal includes an identifier of the first reference signal resource, and the BWP where the source reference signal is located is the first BWP. In the embodiment of the present invention, before the handover, the network side determines a source reference signal (i.e., a first reference signal resource) in beam indication information of a target channel or a target reference signal through beam training and beam reporting on an active BWP (i.e., a first BWP), and sends the beam indication information to the terminal.

In this embodiment of the present invention, if the target channel or the target reference signal is a downlink channel or a downlink reference signal, the beam indication information is TCI state information of the target channel or the target reference signal, where the TCI state information includes: and each QCL-Type corresponds to a source reference signal, and the identifier of the cell in which the source reference signal is positioned and the identifier of the BWP.

The QCL-Type comprises QCL-Type A-D, if the QCL-Type is QCL-Type A-C, time domain and frequency domain QCL information is indicated, and if the QCL-Type is QCL-Type D, space QCL information is indicated, and space receiving parameters, namely beam information, can be determined according to the information. And the UE determines a downlink receiving beam or an uplink sending beam according to the information, so that a beam link is established between the UE and the network side, and the target channel or the target reference signal is transmitted.

In this embodiment of the present invention, if the target channel or the target reference signal is an uplink channel or a reference signal, the beam indication information is spatial relationship information of the target channel or the target reference signal, and the spatial relationship information includes: a source reference signal, and an identification of the cell and an identification of the BWP in which the source reference signal is located.

In this embodiment of the present invention, the beam indication information is carried by at least one of the following ways: RRC signaling, MAC CE command, and DCI signaling.

If the target channel is PDCCH, 1 TCI state may be configured by RRC signaling, or 1 TCI state may be activated by using MAC CE from multiple TCI states configured by RRC signaling

If the target channel is the PDSCH, multiple TCI states may be configured by RRC signaling, and the MAC CE activates at least one TCI state from the multiple TCI states and indicates one TCI state through the DCI.

In this embodiment of the present invention, the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal includes:

step 211A: ignoring an identification of a first BWP indicated in the beam indication information;

step 212A: acquiring an identifier of the first reference signal resource in information of a source reference signal in the beam indication information;

step 213A: using the second reference signal resource of the second BWP having the same identification as a source reference signal of a target channel or a source reference signal of a target reference signal.

In this embodiment of the present invention, optionally, the target channel or the target reference signal and the source reference signal in the beam indication information are on different component carriers, or on different BWPs of the same component carrier, or on the same BWP.

In this embodiment of the present invention, optionally, the first BWP and the second BWP belong to the same component carrier. The channels of the same component carrier are close to each other, so that the channel characteristics of the channels corresponding to the reference signal resources of the two component carriers are close to each other.

In this embodiment of the present invention, optionally, after the using the second reference signal resource as the source reference signal of the target channel or the source reference signal of the target reference signal, the method further includes:

and determining the beam information of the target channel or the target reference signal according to the source reference signal of the target channel or the source reference signal of the target reference signal.

In the embodiment of the present invention, the beam indication information is at least one of a spatial filter (spatial filter), a spatial domain transmission filter (spatial domain transmission filter), TCI state information, QCL information, and spatial relationship information.

step 22A: and if new beam indication information of the target channel or the target reference signal is received, wherein the new beam indication information comprises information of a source reference signal and an identifier of a BWP (BWP) where the source reference signal is located, and the BWP where the source reference signal is located is the second BWP, determining the beam information of the target channel or the target reference signal according to the source reference signal in the new beam indication information.

That is, if new beam indication information is received after switching BWP, beam information of the target channel or the target reference signal is determined according to the source reference signal indicated in the new beam indication information.

Second, network side equipment

step 201B: transmitting configuration information of a reference signal resource set of a plurality of BWPs, the plurality of BWPs including the first BWP and a second BWP, the reference signal resource set of the plurality of BWPs including at least one same reference signal resource identity.

In the embodiment of the present invention, the network side may configure the reference signal resource set on each BWP for the terminal through RRC signaling.

Optionally, the set of reference signal resources includes at least one of:

a set of CSI-RS resources;

a set of SSB resources;

a set of SRS resources.

step 202B: and sending beam indication information, wherein the beam indication information comprises at least one of information of a source reference signal and an identifier of a BWP where the source reference signal is located, the information of the source reference signal comprises an identifier of the first reference signal resource, and the BWP where the source reference signal is located is the first BWP.

In the embodiment of the present invention, before the handover, the network side determines a source reference signal (i.e., a first reference signal resource) in beam indication information of a target channel or a target reference signal through beam training and beam reporting on an active BWP (i.e., a first BWP), and sends the beam indication information to the terminal.

step 211B: ignoring an identification of a first BWP indicated in the beam indication information;

step 212B: acquiring an identifier of the first reference signal resource in information of a source reference signal in the beam indication information;

step 213B: using the second reference signal resource of the second BWP having the same identification as a source reference signal of a target channel or a source reference signal of a target reference signal.

step 22B: and sending new beam indication information of the target channel or the target reference signal, wherein the new beam indication information comprises information of the source reference signal and an identifier of a BWP (broadband access point) where the source reference signal is located, and the BWP where the source reference signal is located is the second BWP.

That is, after the handover, the network side device may further re-determine the source reference signal of the target channel or the source reference signal of the target reference signal, determine the beam information of the target channel or the target reference signal according to the re-determined source reference signal, and re-transmit the beam indication information.

The following describes an example of a method for determining source reference signal information according to an embodiment of the present invention, where the PDCCH is taken as a target channel in the example, but the method in the example is also applicable to other various channels (e.g., PDSCH, PUCCH, etc.) or reference signals (CSI-RS, SRS, etc.).

Assume that in beam indication information (such as RRC signaling configuration and MAC CE command activation information) of a PDCCH on at least one Component Carrier (CC) in one frequency band (band) or cell group (cell group), a source reference signal in a TCI state is CSI-RS resource corresponding to CSI-RS resource ID 1 on BWP1 of CC1, and BWP ID is BWP 1. The CC in which the PDCCH is located may not be CC 1. Active BWP at CC1 is BWP 1. When BWP switching occurs, i.e. switching from BWP1 to BWP2, BWP2 becomes active BWP. If the CSI-RS resource ID 1 is also configured in BWP2, after BWP handover, the original TCI state information is used instead of re-configuring the TCI state for the PDCCH using RRC signaling or re-activating the TCI state by the MAC CE, but the BWP ID in the original TCI state information is ignored (because BWP1 has become inactive BWP), and the CSI-RS resource corresponding to the CSI-RS resource ID 1 on BWP2 is directly used as the source reference signal.

Based on the same inventive concept, please refer to fig. 2, an embodiment of the present invention further provides a communication device 30, including:

a processing module 31, configured to, if a handover is made from a first bandwidth part BWP to a second BWP and a second reference signal resource is configured in the second BWP, use the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal after the handover, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is the source reference signal of the target channel or the source reference signal of the target reference signal before the handover.

In the embodiment of the present invention, when BWP handover occurs, if a new BWP configures a second reference signal resource, where the second reference signal resource is the same as an identifier of a first reference signal resource of a BWP activated before the handover, and the first reference signal resource is used as a source reference signal of a target channel or a source reference signal of a target reference signal before the handover, beam training is not required again, the source reference signal of the source reference signal or the target reference signal of the target channel is determined again, and downlink signaling is used again to transmit beam indication information, and only the second reference signal resource is used as the source reference signal of the source reference signal or the target reference signal of the target channel to determine beam information of the target channel or the target reference signal, so that beam training overhead and signaling overhead increased when BWP handover is frequent can be reduced.

The following describes the configurations of the terminal and the network side device, respectively.

One, terminal

Optionally, the first reference signal resource and the second reference signal resource are the same reference signal resource.

Optionally, the first reference signal resource is a reference signal resource in a first reference signal resource set of the first BWP; the second reference signal resource is a reference signal resource in a second set of reference signal resources of the second BWP.

Optionally, the terminal further includes:

a first receiving module, configured to receive configuration information of a reference signal resource set of multiple BWPs, where the multiple BWPs include the first BWP and a second BWP, and the reference signal resource set of the multiple BWPs includes at least one same reference signal resource identifier.

Optionally, the set of reference signal resources includes at least one of:

a set of CSI-RS resources;

a set of SSB resources;

a set of SRS resources. Optionally, the terminal further includes:

a second receiving module, configured to receive beam indication information, where the beam indication information includes at least one of information of a source reference signal and an identifier of a BWP where the source reference signal is located, where the information of the source reference signal includes an identifier of the first reference signal resource, and the BWP where the source reference signal is located is the first BWP.

Optionally, if the target channel or the target reference signal is a downlink channel or a reference signal, the beam indication information is transmission configuration indication TCI state information of the target channel or the target reference signal, and if the target channel or the target reference signal is an uplink channel or a reference signal, the beam indication information is spatial relationship information of the target channel or the target reference signal.

Optionally, the beam indication information is carried by at least one of the following ways: RRC signaling, MAC CE command, and DCI signaling.

Optionally, the processing module is configured to ignore an identifier of the first BWP indicated in the beam indication information; acquiring an identifier of the first reference signal resource in information of a source reference signal in the beam indication information; using the second reference signal resource of the second BWP having the same identification as a source reference signal of a target channel or a source reference signal of a target reference signal.

Optionally, the target channel or the target reference signal is on a different component carrier from the source reference signal in the beam indication information, or on a different BWP of the same component carrier, or on the same BWP.

Optionally, the first BWP and the second BWP belong to the same component carrier.

Optionally, the terminal further includes:

a first determining module, configured to determine beam information of the target channel or the target reference signal according to a source reference signal of the target channel or a source reference signal of the target reference signal.

Optionally, the beam indication information is at least one of QCL information, spatial filter information, spatial domain transmission filter information, TCI state information, and spatial relationship information.

Optionally, the terminal further includes:

a second determining module, configured to determine, if new beam indication information of the target channel or the target reference signal is received, where the new beam indication information includes information of a source reference signal and an identifier of a BWP where the source reference signal is located, and the BWP where the source reference signal is located is the second BWP, beam information of the target channel or the target reference signal according to the source reference signal in the new beam indication information.

Second, network side equipment

Optionally, the network side device further includes:

a first sending module, configured to send configuration information of a reference signal resource set of multiple BWPs, where the multiple BWPs include the first BWP and a second BWP, and the reference signal resource set of the multiple BWPs includes at least one same reference signal resource identifier.

Optionally, the set of reference signal resources includes at least one of:

a set of CSI-RS resources;

a set of SSB resources;

a set of SRS resources.

Optionally, the network side device further includes:

a second sending module, configured to send beam indication information, where the beam indication information includes at least one of information of a source reference signal and an identifier of a BWP where the source reference signal is located, where the information of the source reference signal includes an identifier of the first reference signal resource, and the BWP where the source reference signal is located is the first BWP.

Optionally, the processing module is configured to ignore an identifier of the first BWP indicated in the beam indication information; acquiring an identifier of the first reference signal resource in information of a source reference signal in the beam indication information; using the second reference signal resource of the second BWP having the same identification as a source reference signal of the target channel or a source reference signal of a target reference signal.

Optionally, the communication device further includes:

a determining module, configured to determine beam information of the target channel or the target reference signal according to the source reference signal of the target channel or the source reference signal of the target reference signal.

Optionally, the network side device further includes:

a third sending module, configured to send new beam indication information of the target channel or the target reference signal, where the new beam indication information includes information of a source reference signal and an identifier of a BWP where the source reference signal is located, and the BWP where the source reference signal is located is the second BWP.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention, where the terminal 40 includes but is not limited to: radio frequency unit 41, network module 42, audio output unit 43, input unit 44, sensor 45, display unit 46, user input unit 47, interface unit 48, memory 49, processor 410, and power supply 411. Those skilled in the art will appreciate that the terminal configuration shown in fig. 4 is not intended to be limiting, and that the terminal may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

The processor 410 is configured to, if a handover is made from a first bandwidth part BWP to a second BWP, and a second reference signal resource is configured in the second BWP, use the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal after the handover, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is a source reference signal of the target channel or a source reference signal of the target reference signal before the handover.

The terminal provided by the embodiment of the present invention can implement each process implemented by the terminal in the above method embodiments, and is not described herein again to avoid repetition.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 41 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 410; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 41 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 41 can also communicate with a network and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user via the network module 42, such as assisting the user in sending and receiving e-mails, browsing web pages, and accessing streaming media.

The audio output unit 43 may convert audio data received by the radio frequency unit 41 or the network module 42 or stored in the memory 49 into an audio signal and output as sound. Also, the audio output unit 43 may also provide audio output related to a specific function performed by the terminal 40 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 43 includes a speaker, a buzzer, a receiver, and the like.

The input unit 44 is for receiving an audio or video signal. The input Unit 44 may include a Graphics Processing Unit (GPU) 441 and a microphone 442, and the Graphics processor 4101 processes image data of still pictures or videos obtained by an image capturing apparatus (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 46. The image frames processed by the graphic processor 4101 may be stored in the memory 49 (or other storage medium) or transmitted via the radio frequency unit 41 or the network module 42. The microphone 442 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 41 in case of the phone call mode.

The terminal 40 also includes at least one sensor 45, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 461 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 461 and/or a backlight when the terminal 40 moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 45 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 46 is used to display information input by the user or information provided to the user. The Display unit 46 may include a Display panel 461, and the Display panel 461 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 47 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 47 includes a touch panel 471 and other input devices 472. The touch panel 471, also referred to as a touch screen, may collect touch operations by a user (e.g., operations by a user on or near the touch panel 471 using a finger, a stylus, or any other suitable object or accessory). The touch panel 471 can include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 410, receives a command from the processor 410, and executes the command. In addition, the touch panel 471 can be implemented by various types, such as resistive, capacitive, infrared, and surface acoustic wave. The user input unit 47 may include other input devices 472 in addition to the touch panel 471. Specifically, the other input devices 472 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, and a joystick, which are not described herein again.

Further, the touch panel 471 can be overlaid on the display panel 461, and when the touch panel 471 detects a touch operation on or near the touch panel 471, the touch panel transmits the touch operation to the processor 410 to determine the type of the touch event, and then the processor 410 provides a corresponding visual output on the display panel 461 according to the type of the touch event. Although the touch panel 471 and the display panel 461 are shown as two separate components in fig. 4, in some embodiments, the touch panel 471 and the display panel 461 may be integrated to implement the input and output functions of the terminal, and are not limited herein.

The interface unit 48 is an interface for connecting an external device to the terminal 40. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 48 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the terminal 40 or may be used to transmit data between the terminal 40 and external devices.

The memory 49 may be used to store software programs as well as various data. The memory 49 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 49 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 410 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 49 and calling data stored in the memory 49, thereby performing overall monitoring of the terminal. Processor 410 may include one or more processing units; preferably, the processor 410 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 410.

The terminal 40 may further include a power supply 411 (e.g., a battery) for supplying power to various components, and preferably, the power supply 411 may be logically connected to the processor 410 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

In addition, the terminal 40 includes some functional modules that are not shown, and are not described in detail herein.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a communication device according to another embodiment of the present invention, where the communication device 50 includes: a processor 51 and a memory 52. In the embodiment of the present invention, the communication device 50 further includes: a computer program stored on the memory 52 and executable on the processor 51, the computer program realizing the following steps when executed by the processor 51:

if the first bandwidth part BWP is switched to a second BWP, and a second reference signal resource is configured in the second BWP, the second reference signal resource is used as a source reference signal of a target channel or a source reference signal of a target reference signal after the switching, where an identifier of the second reference signal resource is the same as an identifier of a first reference signal resource of the first BWP, and the first reference signal resource is a source reference signal of the target channel or a source reference signal of the target reference signal before the switching.

Optionally, the first reference signal resource is a reference signal resource in a first reference signal resource set of the first BWP;

the second reference signal resource is a reference signal resource in a second set of reference signal resources of the second BWP.

Optionally, the communication device is a terminal, and the computer program when executed by the processor 51 may further implement the following steps:

before switching from the first BWP to the second BWP, the method further comprises:

receiving configuration information of a reference signal resource set of a plurality of BWPs, the plurality of BWPs including the first BWP and a second BWP, the reference signal resource set of the plurality of BWPs including at least one same reference signal resource identity.

Optionally, the communication device is a network-side device, and when being executed by the processor 51, the computer program may further implement the following steps:

transmitting configuration information of a reference signal resource set of a plurality of BWPs, the plurality of BWPs including the first BWP and a second BWP, the reference signal resource set of the plurality of BWPs including at least one same reference signal resource identity.

Optionally, the set of reference signal resources includes at least one of:

a set of channel state information reference signal, CSI-RS, resources;

a set of synchronization signal block SSB resources;

a set of sounding reference signal, SRS, resources.

receiving beam indication information, where the beam indication information includes at least one of information of a source reference signal and an identifier of a BWP where the source reference signal is located, where the information of the source reference signal includes an identifier of the first reference signal resource, and the BWP where the source reference signal is located is the first BWP.

and sending beam indication information, wherein the beam indication information comprises at least one of information of a source reference signal and an identifier of a BWP where the source reference signal is located, the information of the source reference signal comprises an identifier of the first reference signal resource, and the BWP where the source reference signal is located is the first BWP.

Optionally, if the target channel or the target reference signal is a downlink channel or a downlink reference signal, the beam indication information indicates TCI status information for transmission configuration of the target channel or the target reference signal;

if the target channel or the target reference signal is an uplink channel or a reference signal, the beam indication information is spatial relationship information of the target channel or the target reference signal.

Optionally, the beam indication information is carried by at least one of the following ways:

RRC signaling, MAC CE command, and DCI signaling.

Optionally, the computer program when executed by the processor 51 may further implement the steps of:

the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal comprises:

ignoring an identification of a first BWP indicated in the beam indication information;

acquiring an identifier of the first reference signal resource in information of a source reference signal in the beam indication information;

using the second reference signal resource of the second BWP having the same identification as a source reference signal of a target channel or a source reference signal of a target reference signal.

the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal further includes:

and if new beam indication information of the target channel or the target reference signal is received, wherein the new beam indication information comprises information of a source reference signal and an identifier of a BWP (BWP) where the source reference signal is located, and the BWP where the source reference signal is located is the second BWP, determining the beam information of the target channel or the target reference signal according to the source reference signal in the new beam indication information.

and sending new beam indication information of the target channel or the target reference signal, wherein the new beam indication information comprises information of the source reference signal and an identifier of a BWP (broadband access point) where the source reference signal is located, and the BWP where the source reference signal is located is the second BWP.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the method for determining source reference signal information in the above embodiments, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for determining source reference signal information, applied to a communication device, comprising:

2. The method of claim 1, wherein the first reference signal resource and the second reference signal resource are the same reference signal resource.

3. The method of claim 1,

the first reference signal resource is a reference signal resource in a first set of reference signal resources of the first BWP;

4. The method of claim 1, wherein the communication device is a terminal, and wherein switching from the first BWP to the second BWP further comprises, prior to:

5. The method of claim 1, wherein the communication device is a network-side device, and wherein switching from the first BWP to the second BWP further comprises:

6. The method of claim 4 or 5, wherein the set of reference signal resources comprises at least one of:

a set of channel state information reference signal, CSI-RS, resources;

a set of synchronization signal block SSB resources;

a set of sounding reference signal, SRS, resources.

7. The method of claim 1, wherein the communication device is a terminal, and wherein switching from the first BWP to the second BWP further comprises, prior to:

8. The method of claim 1, wherein the communication device is a network-side device, and wherein switching from the first BWP to the second BWP further comprises:

9. The method of claim 7 or 8,

if the target channel or the target reference signal is a downlink channel or a downlink reference signal, the beam indication information is Transmission Configuration Indication (TCI) state information of the target channel or the target reference signal;

10. The method according to claim 7 or 8, wherein the beam indication information is carried by at least one of:

RRC signaling, MAC CE command, and DCI signaling.

11. The method of claim 7 or 8, wherein the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal comprises:

12. The method of claim 7 or 8,

the target channel or the target reference signal is on a different component carrier or on a different BWP of the same component carrier or on the same BWP with the source reference signal in the beam indication information.

13. The method of claim 1, wherein the first BWP and the second BWP belong to a same component carrier.

14. The method of claim 1, wherein the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal is further followed by:

15. The method of claim 7 or 8, wherein the beam indication information is at least one of QCL information, spatial filter information, spatial domain transmission filter information, TCI state information, spatial relationship information.

16. The method of claim 1, wherein the communication device is a terminal, and wherein the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal is followed by further comprising:

17. The method of claim 1, wherein the communication device is a network side device, and wherein the using the second reference signal resource as a source reference signal of a target channel or a source reference signal of a target reference signal is further followed by:

18. A communication device, comprising:

19. A communication device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of determining source reference signal information according to any one of claims 1 to 17.

20. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of determining source reference signal information according to any one of claims 1 to 17.