CN111436082B

CN111436082B - Communication method and communication device

Info

Publication number: CN111436082B
Application number: CN201910028787.5A
Authority: CN
Inventors: 黎超; 王俊伟; 张兴炜
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2023-04-07
Anticipated expiration: 2039-01-11
Also published as: CN111436082A; WO2020143730A1

Abstract

The application provides a communication method and a communication device. The method comprises the following steps: the first terminal device acquires configuration information of a side link bandwidth part BWP, wherein the configuration information comprises configuration information of the side link BWP corresponding to a connection state, and the connection state is a connection state between the terminal device and the network device; the first terminal device switches from the sidelink first BWP to the sidelink second BWP according to a first configuration information and a second configuration information in the configuration information, wherein the first configuration information is the configuration information of the sidelink first BWP, and the second configuration information is the configuration information of the sidelink second BWP. The technical scheme provided by the application can reduce the interruption of communication caused by the BWP switching of the sidelink, improve the reliability of communication, and can be applied to the Internet of vehicles, such as V2X, LTE-V, V2V and the like.

Description

Communication method and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and a communication apparatus.

Background

In a 5G NR system implemented by the third generation partnership project (3 gpp), a concept of a bandwidth part (BWP) is introduced, so that a terminal device can operate at a low bandwidth, the cost and power consumption of the terminal device are reduced, and the configuration of a bandwidth of the 5G system is more flexible.

When BWP handover is performed by a terminal device, a base station (NB) is required to perform BWP parameter reconfiguration on the terminal device, and during the parameter reconfiguration, a Radio Frequency (RF) module needs to be switched, which may cause transmission interruption and affect communication reliability.

Therefore, how to reduce the interruption influence of BWP switching on communication and improve communication reliability is an urgent problem to be solved.

Disclosure of Invention

The application provides a communication method and a communication device, which can improve communication reliability.

In a first aspect, a method of communication is provided. The method provided by the first aspect may be executed by the first terminal device, and may also be executed by a chip configured in the first terminal device, which is not limited in this application.

Specifically, the method comprises the following steps: the first terminal device obtains configuration information of bandwidth part BWP corresponding to at least two connection states respectively, wherein the connection states are connection states between the terminal device and the network device, the at least two connection states comprise an idle state, a connection state or an off-network state, and the BWP corresponding to the at least two connection states respectively is used for a sidelink; the first terminal device switches from the first BWP to a second BWP according to configuration information of the first BWP and configuration information of the second BWP in the configuration information; wherein the first BWP and the second BWP belong to BWPs corresponding to the at least two connection states, respectively.

In the communication method provided in the first aspect, the first terminal device obtains configuration information of bandwidth portions BWP corresponding to at least two connection states, respectively, and switches from a first BWP to a second BWP according to the configuration information of the first BWP and configuration information of the second BWP in the configuration information, where the first BWP and the second BWP belong to BWPs corresponding to the at least two connection states, respectively. The method enables the terminal equipment which carries out communication to carry out the same BWP switching, reduces communication interruption caused by BWP switching and improves communication reliability.

In a possible implementation manner of the first aspect, the BWPs corresponding to the at least two connection states respectively include: a BWP corresponding to an idle state; and/or at least one BWP corresponding to the outside of the network, and/or at least one BWP corresponding to the connected state.

In one possible implementation manner of the first aspect, before the switching from the first BWP to the second BWP, the method further includes: the first terminal device receives switching indication information from a network device or a second terminal device, wherein the switching indication information is used for indicating the first terminal device to switch from the first BWP to the second BWP; the switching from the first BWP to the second BWP comprises: the first terminal device switches from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information, and the switch indication information.

In a possible implementation manner of the first aspect, when the first terminal device is in a connected state, the first terminal device receives the handover indication information from the network device; or, when the first terminal device is in an idle state or outside a network, the first terminal device receives the handover indication information from the second terminal device.

In one possible implementation manner of the first aspect, before the switching from the first BWP to the second BWP, the method further includes: and the first terminal equipment sends the switching indication information to the third terminal equipment.

For example, when one terminal device performing BWP handover is outside the network, communication with the network device is not possible, and the terminal device does not receive handover instruction information for instructing the terminal device to perform BWP handover, which is transmitted by the network device. In order to realize simultaneous switching of a plurality of BWPs, the first terminal device in a connected state may send the switching indication information to the terminal devices outside the network via the sidelink, thereby ensuring that the terminal devices communicating in the communication system perform BWP switching simultaneously, reducing communication interruption caused by switching of a plurality of BWPs, and improving communication reliability.

In a possible implementation manner of the first aspect, the handover indication information is further used to indicate at least one of the following information: the moment when the handover starts; the time when the switching is completed, or the length of time for performing BWP switching; a transmission resource on the second BWP.

By indicating the switching start time and/or the switching completion time or the BWP switching duration through the switching indication information, the terminal device receiving the switching indication information starts to perform BWP switching in the same time slot, thereby avoiding multiple communication interruptions caused by switching of a plurality of BWPs at different times.

In a possible implementation manner of the first aspect, the switching, by the first terminal device, from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information includes: the first terminal device switches from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information and a preconfigured switch condition; the preconfigured switching condition is a correspondence between a switching of connection state of the first terminal device and BWP switching.

When the connection state of the first terminal device and the network device changes, for example, the first terminal device switches from the off-network state to the idle state, the first terminal device performs BWP switching according to a preconfigured switching condition preconfigured by the system.

In one possible implementation form of the first aspect, the preconfigured switching condition comprises: under the condition that the first terminal device is switched from a connected state to an idle state, the first terminal device is switched from one BWP in at least one BWP corresponding to the connected state to one BWP corresponding to the idle state; or under the condition that the first terminal device is switched from an idle state to a connected state, the first terminal device is switched from a BWP corresponding to the idle state to one BWP in at least one BWP corresponding to the connected state; or in the case that the first terminal device is switched from the connected state to the outside of the network, the first terminal device is switched from one BWP corresponding to the connected state to one BWP of at least one BWP corresponding to the outside of the network; or in the case that the first terminal device is switched from outside the network to the connected state, the first terminal device is switched from a BWP corresponding to outside the network to one BWP of at least one BWP corresponding to the connected state; or under the condition that the first terminal device is switched to an idle state from outside the network, the first terminal device is switched to a BWP corresponding to the idle state from a BWP corresponding to the outside of the network; or under the condition that the first terminal device is switched from the idle state to the outside of the network, the first terminal device is switched from the BWP corresponding to the idle state to one BWP in the at least one BWP corresponding to the outside of the network.

In a possible implementation manner of the first aspect, the configuration information includes time-frequency resources of BWPs corresponding to the at least two connection states, where the time-frequency resources of the at least one BWP corresponding to the connection state are a subset of the time-frequency resources of the BWPs corresponding to the idle state; and/or the time-frequency resource of at least one BWP corresponding to the outside of the network is a subset of the time-frequency resource of the BWP corresponding to the idle state; and/or the time-frequency resource of at least one BWP corresponding to the connection state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network; and/or the time-frequency resource of the BWP corresponding to the idle state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network.

The configuration information configures the relation of time-frequency resources among different connection states, so that the terminal equipment in different connection states can normally communicate with each other.

In one possible implementation manner of the first aspect, before the switching from the first BWP to the second BWP, the method further includes: the first terminal device sends the BWP switching delay type supported by the first terminal device to the network device; wherein, different switching delay types of the BWP supported by the first terminal device correspond to different BWP switching delays.

The handover delays for different BWP types are different. In order to implement simultaneous switching of multiple BWPs, the terminal device needs to send the supported BWP types to the network device for determining the switching duration before performing BWP switching.

In a possible implementation manner of the first aspect, the method further includes: the first terminal device obtains a first switching duration, wherein the first switching duration is the maximum value of the BWP switching delays corresponding to the BWP switching delay types supported by a pair of terminal devices or a group of terminal devices; the first terminal device does not transmit data within the first switching duration after the switching is started.

After receiving the supported BWP handover delay type sent by the terminal device, the network device determines that the maximum value of the handover durations corresponding to the BWP handover delay type is the duration of the simultaneous handover, i.e., the first handover duration. In the first switching duration, when the switching delay corresponding to a certain supported BWP type is smaller than the first switching duration, the terminal device does not send data after the switching is completed before the first switching duration is finished, so as to avoid that other terminal devices communicating with the terminal device cannot perform normal communication without completing the switching.

In a possible implementation manner of the first aspect, the method further includes: after switching from the first BWP to the second BWP, the first terminal device receives first indication information, where the first indication information is used for the first terminal device to determine that the first BWP switching is successful.

In a possible implementation manner of the first aspect, the first indication information includes at least one of: indication information of the first BWP; indication information of the second BWP; time interval information indicating an interval between a start time or a completion time of the handover from the first BWP to the second BWP and a transmission time of the first indication information.

In a possible implementation manner of the first aspect, the method further includes: after the switch from the first BWP to the second BWP, the first terminal device sends second indication information, where the second indication information is used to determine that the first BWP switch is successful.

In a possible implementation manner of the first aspect, the second indication information includes at least one of the following: indication information of the first BWP; indication information of the second BWP; an indication that the BWP handover was successful.

After the first terminal device switches from the first BWP to the second BWP, in order to determine that the first terminal device switches successfully, the first terminal device and the network device may send indication information to each other for determining that the first terminal device switches successfully. For example, the network device sends the first indication information to the first terminal device, or the first terminal device sends the second indication information to the network device.

In a possible implementation manner of the first aspect, the handover indication information is further used to indicate that M BWPs currently activated are handed over simultaneously, where the M BWPs include a BWP of a sidelink and a BWP of a cellular link, and M is a positive integer greater than 1.

In one possible implementation of the first aspect, the BWP of the sidelink and the BWP of the cellular link are on one carrier or multiple carriers.

In a possible implementation manner of the first aspect, the method further includes: before the simultaneous handover of the currently active M BWPs, the first terminal device sends the following information to the network device: whether simultaneous handover of BWP of the cellular link and BWP of the sidelink is supported; or a total number of BWPs supporting simultaneous switching of the cellular link and the sidelink; and/or the number of BWPs supporting simultaneous handover in the BWP supporting the cellular link and the BWP supporting the sidelink under the condition of supporting simultaneous handover of BWP supporting the cellular link and BWP supporting the sidelink; or a handover latency type of the BWP supporting simultaneous handover of the cellular link and a handover latency or a handover latency type of the BWP of the sidelink under a condition that supports simultaneous handover of the BWP of the cellular link and the BWP of the sidelink.

The switching indication information indicates that the currently simultaneously activated cellular link BWP and the sidelink link BWP are switched simultaneously, thereby avoiding communication interruption to other working BWPs when partial BWPs are switched due to inconsistency of switching time in the simultaneously activated BWPs.

In a second aspect, a method of communication is provided. The method provided by the second aspect may be executed by the first terminal device, and may also be executed by a chip configured in the first terminal device, which is not limited in this application.

Specifically, the method comprises the following steps: the method comprises the steps that first terminal equipment acquires first switching indication information, wherein the first switching indication information is used for indicating the switching of currently activated M bandwidth parts BWP, and M is a positive integer larger than 1; the first terminal device performs switching of BWP according to the first switching indication information.

In order to avoid interference of the partial BWP handover with other BWPs working simultaneously, the first terminal device receives the first indication information indicating that the BWPs active simultaneously perform the handover simultaneously.

In one possible implementation manner of the second aspect, the link types of the currently activated M BWPs are the same or different, where the link types of the BWPs include: BWP for cellular links and BWP for sidelink.

In one possible implementation manner of the second aspect, the first switching indication information includes any one of the following: instructing N BWPs of the currently activated M BWPs to switch simultaneously, wherein N is a positive integer not greater than M; indicating whether N BWPs in the currently activated M BWPs are switched simultaneously, wherein N is a positive integer not greater than M; instructing N BWPs of the currently activated M BWPs to switch, wherein N is a positive integer not greater than M; indication information indicating whether to perform BWP handover of the cellular link and BWP handover of the sidelink at the same time.

In one possible implementation manner of the second aspect, the method includes: reporting the following information to the network device before switching the BWP according to the first switching indication information: whether simultaneous activation of more than one BWP is supported; or the number of BWPs supporting simultaneous activation; or whether to support simultaneous activation of BWP for the cellular link and BWP for the sidelink; or a total number of BWPs supporting simultaneous activation of the cellular link and the sidelink; and/or the number of BWPs supporting simultaneous activation of the cellular link and the number of BWPs supporting simultaneous activation of the sidelink on a condition that BWPs supporting simultaneous activation of the cellular link and BWPs supporting simultaneous activation of the sidelink; or whether simultaneous handover of BWP of the cellular link and BWP of the sidelink is supported; or a total number of BWPs supporting simultaneous switching of the cellular link and the sidelink; and/or the number of BWPs supporting simultaneous handover in the BWP supporting the cellular link and the BWP supporting the sidelink under the condition of supporting simultaneous handover of BWP supporting the cellular link and BWP supporting the sidelink; or a handover latency or handover latency type that supports simultaneous handover of the BWP of the cellular link and the BWP of the sidelink; or a handover latency or handover latency type for BWP supporting multiple identical links.

In one possible implementation of the second aspect, the first handover indication information is carried by any one or more of SIB, RRC, MAC CE, or DCI.

In a possible implementation manner of the second aspect, the value of M is 2, and the value of n is 1 or 2.

In the embodiment of the present application, the N BWPs performing handover simultaneously may be BWPs of the same type, for example, the N BWPs are N cellular link BWPs or N sidelink BWPs. Different types of BWPs are also possible, e.g., N BWPs including cellular link BWP and sidelink BWP. The embodiments of the present application do not limit this.

In one possible implementation of the second aspect, the M BWPs are on one carrier or on multiple different carriers.

In one possible implementation manner of the second aspect, the method further includes: acquiring the configuration information of the BWP of the cellular link and/or the BWP of the sidelink before performing the handover of the BWP according to the first handover indication information.

Alternatively, the configuration information may be sent by the network device to the terminal device. For example, the network device sends the configuration information to the terminal device through configured broadcast or multicast configuration signaling. The configuration signaling can be any one or more combination of SIB, RRC, MAC or DCI.

In a third aspect, a method of communication is provided. The method provided by the third aspect may be executed by the first terminal device, and may also be executed by a chip configured in the first terminal device, which is not limited in this application.

Specifically, the method comprises the following steps: the first terminal equipment acquires configuration information of a timer corresponding to a first bandwidth part BWP of a side link; the first terminal equipment manages the timer according to the configuration information of the timer; and if the timer expires, switching from the sidelink first BWP to a sidelink second BWP, where the sidelink first BWP is a currently activated BWP of the sidelink, and the sidelink second BWP is an idle BWP of the sidelink of the terminal device or a BWP for the sidelink outside the network.

In a possible implementation of the third aspect, the timer expiring is that a value of the timer exceeds a duration of a predefined, signaling configured, or preconfigured timer.

In a possible implementation manner of the third aspect, the timing configuration information includes: a step size of the timer and/or a duration of the timer.

The configuration information manages the timer by configuring a step size of the timer and/or a duration of the timer. For example, when the value of the timer exceeds a preset timer value, the timer expires.

In a possible implementation form of the third aspect, the timer step size and/or the duration of the timer is associated with at least one of the following parameters: the traffic type of the sidelink; quality of service parameters for the sidelink; a subcarrier spacing value of a sidelink; a resource pool used by the sidelink; the waveform type of the sidelink.

The step size of the timer and/or the duration of the timer may be adaptively configured according to actual requirements. For example, when the quality of service requirement of the sidelink is high, the step size of the timer and/or the duration of the timer is smaller. The specific parameters are determined according to actual requirements.

In a possible implementation manner of the third aspect, the method further includes: if the first condition is satisfied, the timer is started or restarted.

When the first condition is met, if the current timer is not started, the timer is started at the moment. The timer is restarted the next time the first condition is met. If, when the first condition is satisfied, the timer has already been started, the timer is restarted.

In a possible implementation manner of the third aspect, the first condition includes any one of the following conditions: the terminal equipment is in a connected state and receives downlink control information of a scheduling cellular link sent by network equipment; the terminal device detects downlink control information of a scheduling side uplink sent by the network device; the terminal equipment sends the buffer state of the side link, the scheduling request of the side link, the HARQ response message of the side link or the CSI feedback information of the side link to the network equipment; the terminal equipment receives response information of ACK of a side link; the terminal device successfully detects the sidelink control information SCI of the sidelink.

In one possible implementation manner of the third aspect, the managing the timer includes: when the timer is running and the timer does not detect any of the following information within the time of the corresponding step size, increasing the value of the timer: when the network equipment sends downlink control information of a scheduling cellular link; when the network equipment sends downlink control information of a scheduling side uplink; when ACK response information of a sidelink is received; sidelink control information SCI.

By managing the timer, the timer values of the network device and the terminal device are compared to determine whether the understanding of the scheduling information between the network device and the terminal device is consistent. If the timer values are the same, the understanding of the scheduling information is consistent, and the communication is normal; if the timer values are different, it indicates that the scheduling information is not understood in a consistent manner, and the network device and the terminal device cannot perform normal communication.

In a possible implementation manner of the third aspect, the time of each step of the timer is preconfigured according to the transmission resource of the sidelink.

In a possible implementation manner of the third aspect, the method further includes: when the timer expires, the first terminal device in a connected state sends indication information that the timer expires or indication information that the terminal device is to perform BWP handover of a sidelink to a network device.

When the timer expires, it indicates that normal communication between the terminal device and the network device is not possible, and therefore BWP handover is performed. The first terminal device sends the indication information that the timer expires to the network device, and after receiving the indication information that the timer expires, the network device instructs the first terminal device to perform BWP handover, for example, the network device sends the handover indication information to the first terminal device.

In a fourth aspect, a method of communication is provided. The method provided in the fourth aspect may be executed by a network device, or may be executed by a chip configured in the network device, which is not limited in this application.

Specifically, the method comprises the following steps: the network device determines configuration information of a bandwidth part BWP corresponding to at least two connection states of the first terminal device, wherein the connection states are connection states between the terminal device and the network device, the at least two connection states include an idle state, a connection state or an off-network state, and the BWPs corresponding to the at least two connection states are used for a sidelink; the network device sends the configuration information to the first terminal device.

For example, the network device sends the configuration information to the first terminal device through configured broadcast or multicast configuration signaling. The configuration signaling can be any one or more combination of SIB, RRC, MAC CE or DCI.

In a possible implementation manner of the fourth aspect, the BWPs corresponding to the at least two connection states respectively include: a BWP corresponding to an idle state; and/or at least one BWP corresponding to the outside of the network, and/or at least one BWP corresponding to the connected state.

In one possible implementation manner of the fourth aspect, the method further includes: when the first terminal device is in a connected state, the network device sends switching indication information to the first terminal device, wherein the switching indication information is used for indicating the first terminal device to switch from a first BWP to a second BWP.

For example, the first BWP is the BWP corresponding to the connected state, and the second BWP is the BWP corresponding to the connected state; or the first BWP is a BWP corresponding to a connected state, and the second BWP is a BWP corresponding to an idle state; or the first BWP is corresponding to the connected state, and the second BWP is corresponding to the outside of the network; or the first BWP is a BWP corresponding to an idle state, and the second BWP is a BWP corresponding to a connected state; or the first BWP is a corresponding BWP in an idle state, and the second BWP is a corresponding BWP outside the network; or the first BWP is a corresponding BWP outside the network, and the second BWP is a corresponding BWP in a connected state; or the first BWP is a corresponding BWP outside the network, and the second BWP is a corresponding BWP in an idle state.

In a possible implementation manner of the fourth aspect, the handover indication information is further used to indicate at least one of the following information: the moment when the handover starts; the time when the switching is completed, or the duration of performing BWP switching; a transmission resource on the second BWP.

In one possible implementation manner of the fourth aspect, the method further includes: the network device sends a pre-configured switching condition to the first terminal device, wherein the pre-configured switching condition is a corresponding relation between the switching of the connection state of the first terminal device and the BWP switching.

In one possible implementation manner of the fourth aspect, the preconfigured switching condition comprises: under the condition that the first terminal device is switched from a connected state to an idle state, the first terminal device is switched from one BWP in at least one BWP corresponding to the connected state to one BWP corresponding to the idle state; or under the condition that the first terminal device is switched from an idle state to a connected state, the first terminal device is switched from a BWP corresponding to the idle state to one BWP in at least one BWP corresponding to the connected state; or under the condition that the first terminal device is switched from the connected state to the outside of the network, the first terminal device is switched from one BWP corresponding to the connected state to one BWP in at least one BWP corresponding to the outside of the network; or in the case that the first terminal device is switched from outside the network to the connected state, the first terminal device is switched from a BWP corresponding to outside the network to one BWP of at least one BWP corresponding to the connected state; or under the condition that the first terminal device is switched to the idle state from the outside of the network, the first terminal device is switched to a BWP corresponding to the idle state from a BWP corresponding to the outside of the network; or under the condition that the first terminal device is switched from the idle state to the outside of the network, the first terminal device is switched from one BWP corresponding to the idle state to one BWP in at least one BWP corresponding to the outside of the network.

In a possible implementation manner of the fourth aspect, the configuration information includes time-frequency resources of the BWPs corresponding to the at least two connection states, where the time-frequency resources of the at least one BWP corresponding to the connection state are a subset of the time-frequency resources of the BWPs corresponding to the idle state; and/or, the time frequency resource of at least one BWP corresponding to the outside of the network is a subset of the time frequency resource of the BWP corresponding to the idle state; and/or the time-frequency resource of at least one BWP corresponding to the connection state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network; and/or the time-frequency resource of the BWP corresponding to the idle state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network.

In one possible implementation manner of the fourth aspect, the method further includes: the network device receives the BWP switching delay type supported by the first terminal device and sent by the first terminal device; wherein, different switching delay types of the BWP supported by the first terminal device correspond to different BWP switching delays.

In one possible implementation manner of the fourth aspect, the method further includes: the network device sends a first switching duration to the first terminal device, wherein the first switching duration is the maximum value of the BWP switching delays corresponding to the BWP switching delay types supported by a pair of terminal devices or a group of terminal devices; the first terminal device does not transmit data within the first switching duration after the switching is started.

In a possible implementation manner of the fourth aspect, the first indication information includes at least one of: indication information of the first BWP; indication information of the second BWP; time interval information indicating an interval between a start time or a completion time of the handover from the first BWP to the second BWP and a transmission time of the first indication information.

In one possible implementation manner of the fourth aspect, the method further includes: the network device receives second indication information sent by the first terminal device, wherein the second indication information is used for determining that the first BWP handover is successful.

In a possible implementation manner of the fourth aspect, the second indication information includes at least one of the following: indication information of the first BWP; indication information of the second BWP; an indication that the BWP handover was successful.

In a possible implementation manner of the fourth aspect, the handover indication information is further used to indicate that M BWPs currently activated are handed over simultaneously, where the M BWPs include a BWP of a sidelink and a BWP of a cellular link, and M is a positive integer greater than 1.

In one possible implementation of the fourth aspect, the BWP of the sidelink and the BWP of the cellular link are on one carrier or multiple carriers.

In one possible implementation manner of the fourth aspect, the method further includes: before the simultaneous switching of the currently activated M BWPs, the network device receives the following information sent by the first terminal device: whether simultaneous handover of BWP of the cellular link and BWP of the sidelink is supported; or a total number of BWPs supporting simultaneous switching of the cellular link and the sidelink; and/or supporting the number of simultaneous switching BWPs of the cellular link and the number of simultaneous switching BWPs in the BWPs supporting the sidelink under the condition of supporting simultaneous switching BWPs of the cellular link and BWPs of the sidelink; or a handover latency type of the BWP supporting simultaneous handover of the cellular link and a handover latency or a handover latency type of the BWP of the sidelink under a condition that supports simultaneous handover of the BWP of the cellular link and the BWP of the sidelink.

In a fifth aspect, a method of communication is provided. The method provided by the fifth aspect may be executed by a network device, or may be executed by a chip configured in the network device, which is not limited in this application.

Specifically, the method comprises the following steps: the network device determines first switching indication information of a first terminal device, wherein the first switching indication information is used for indicating switching of currently activated M bandwidth parts BWP, and M is a positive integer greater than 1; the network device sends the first switching indication information to the first terminal device.

In a possible implementation manner of the fifth aspect, the link types of the currently activated M BWPs are the same or different, where the link types of the BWPs include: BWP for cellular links and BWP for sidelink.

In a possible implementation manner of the fifth aspect, the first switching indication information includes any one of the following: instructing N BWPs of the currently activated M BWPs to switch simultaneously, wherein N is a positive integer not greater than M; indicating whether N BWPs in the currently activated M BWPs are switched simultaneously, wherein N is a positive integer not greater than M; instructing N BWPs of the currently activated M BWPs to switch, wherein N is a positive integer not greater than M; indication information indicating whether to perform BWP handover for the cellular link and BWP handover for the sidelink at the same time.

In one possible implementation manner of the fifth aspect, the method includes: before the first terminal device performs BWP handover according to the first handover indication information, the network device receives the following information sent by the first terminal device: whether simultaneous activation of more than one BWP is supported; or the number of BWPs supporting simultaneous activation; or whether to support simultaneous activation of BWP for the cellular link and BWP for the sidelink; or a total number of BWPs supporting simultaneous activation of the cellular link and the sidelink; and/or the number of BWPs supporting simultaneous activation of the cellular link and the number of BWPs supporting simultaneous activation of the sidelink on a condition that BWPs supporting simultaneous activation of the cellular link and BWPs supporting simultaneous activation of the sidelink; or whether to support simultaneous handover of BWP of the cellular link and BWP of the sidelink; or a total number of BWPs supporting simultaneous switching of the cellular link and the sidelink; and/or the number of BWPs supporting simultaneous handover in the BWP supporting the cellular link and the BWP supporting the sidelink under the condition of supporting simultaneous handover of BWP supporting the cellular link and BWP supporting the sidelink; or a handover latency or handover latency type that supports simultaneous handover of the BWP of the cellular link and the BWP of the sidelink; or a handover latency or handover latency type for BWP supporting multiple identical links.

In one possible implementation of the fifth aspect, the first handover indication information is carried by any one or more of SIB, RRC, MAC CE, or DCI.

In a possible implementation manner of the fifth aspect, the value of M is 2, and the value of n is 1 or 2.

In one possible implementation of the fifth aspect, the M BWPs are on one carrier or on multiple different carriers.

In one possible implementation manner of the fifth aspect, the method further includes: acquiring the configuration information of the BWP of the cellular link and/or the BWP of the sidelink before performing the handover of the BWP according to the first handover indication information.

In a sixth aspect, a method of communication is provided. The method provided by the sixth aspect may be executed by a network device, or may be executed by a chip configured in the network device, which is not limited in this application.

Specifically, the method comprises the following steps: the network device determines configuration information of a timer corresponding to a first terminal device for a sidelink first bandwidth part BWP; the network device sends the configuration information to the first terminal device. Wherein the configuration information is used for the first terminal device to manage the timer. If the timer expires, switching from the first sidelink BWP to a second sidelink BWP, where the first sidelink BWP is a currently activated sidelink BWP, and the second sidelink BWP is an idle sidelink BWP of the terminal device or a BWP for an sidelink outside the network.

In a possible implementation of the sixth aspect, the expiration of the timer means that the value of the timer exceeds the duration of a predefined, signaling configured or preconfigured timer.

In a possible implementation manner of the sixth aspect, the timing configuration information includes: a step size of the timer and/or a duration of the timer.

In a possible implementation of the sixth aspect, the timer step size and/or the duration of the timer is associated with at least one of the following parameters: the traffic type of the sidelink; quality of service parameters for the sidelink; a subcarrier spacing value of a sidelink; a resource pool used by the sidelink; the waveform type of the sidelink.

In a possible implementation manner of the sixth aspect, the managing the timer includes: when the timer is running and the timer does not detect any of the following information within the time corresponding to the step size, increasing the value of the timer: when the network equipment sends downlink control information of a scheduling cellular link; when the network equipment sends downlink control information of a scheduling side uplink; when ACK response information of a sidelink is received; sidelink control information SCI.

In a possible implementation manner of the sixth aspect, the time of each step of the timer is preconfigured according to the transmission resource of the sidelink.

In one possible implementation manner of the sixth aspect, the method further includes: when the timer expires, the first terminal device in a connected state sends indication information that the timer expires or indication information that the terminal device is to perform BWP handover of a sidelink to a network device.

In a seventh aspect, a communications apparatus is provided. The communication apparatus may be configured to perform operations of the terminal device in any possible implementation manner of the first aspect and the first aspect, or to perform operations of the terminal device in any possible implementation manner of the second aspect and the second aspect, or to perform operations of the terminal device in any possible implementation manner of the third aspect and the third aspect, and specifically, the communication apparatus includes a component (means) corresponding to the step or the function described in any one of the first aspect to the third aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In an eighth aspect, a communication device is provided. The communication apparatus may be configured to perform the operations of the terminal device in any possible implementation manner of the fourth aspect and the fourth aspect, or to perform the operations of the terminal device in any possible implementation manner of the fifth aspect and the fifth aspect, or to perform the operations of the terminal device in any possible implementation manner of the sixth aspect and the sixth aspect, and specifically, the communication apparatus includes a component (means) corresponding to the step or the function described in any one of the fourth aspect to the sixth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a ninth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions) that, when executed, causes a computer to perform the communication method of any one of the possible implementations of the first to sixth aspects described above.

A tenth aspect provides a computer-readable storage medium storing a program that causes a server in a computer to execute any one of the communication methods of the first to sixth aspects and their various implementations described above.

Alternatively, the computer readable storage medium is used for storing computer software instructions for the server, which include a program designed to execute any one of the communication methods in any one of the possible implementation manners of the first aspect to the sixth aspect.

In an eleventh aspect, a chip system is provided, which includes a processor for enabling a server in a computer to implement the functions referred to in the first to sixth aspects and their various implementations.

Drawings

FIG. 1 is a schematic diagram of a D2D scene;

FIG. 2 is a schematic diagram of a V2X scene;

fig. 3 is a schematic diagram illustrating four scenarios of BWP reconfiguration according to an embodiment of the present application;

fig. 4 is a schematic flow chart diagram of a communication method provided by an embodiment of the present application;

FIG. 5 is a diagram of a scenario in which information is transmitted using a sidelink;

FIG. 6 is a schematic illustration of a handover preparation window provided in an embodiment of the present application;

fig. 7 is a schematic flow chart diagram of a communication method provided by another embodiment of the present application;

fig. 8 is a schematic flow chart diagram of a communication method provided by yet another embodiment of the present application;

FIG. 9 is a schematic block diagram of a communications device provided by one embodiment of the present application;

fig. 10 is a schematic structural diagram of a first terminal device suitable for use in an embodiment of the present application;

fig. 11 is a schematic block diagram of a communication device of another embodiment of the present application;

fig. 12 is a schematic structural diagram of a network device suitable for use in 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 drawings in the embodiments of the present application.

The technical scheme of the embodiment of the application can be applied to communication between the terminal equipment and the terminal equipment in various scenes. For example, a device to device (D2D) scenario, a vehicle to outside information exchange (V2X) scenario, a Machine Type Communication (MTC)/machine to machine (M2M) scenario, and the like.

It should be noted that the technical solution of the embodiments of the present application may also be applied to communication between a serving base station and a terminal device in various scenarios, such as cellular link communication. For convenience of description, the embodiments of the present application take sidelink communication as an example, but the embodiments of the present application are not limited thereto.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, 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 Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

To facilitate understanding of the aspects of the embodiments of the present application, a description will first be made of concepts related to the present application and related technologies.

Device to device (D2D): in order to improve the spectrum utilization and utilize the radio frequency capability of the existing terminal equipment to the maximum extent, the D2D communication link (called sidelink, SL) is considered to multiplex the spectrum resources of the existing mobile communication network. In order not to interfere with terminal equipment of an existing network, D2D communication does not use Downlink (DL) spectrum resources of an LTE-a (long term evolution-advanced) system, but only multiplexes Uplink (UP) spectrum resources of the LTE-a system, because the interference resistance of a base station is relatively better than that of ordinary terminal equipment. The possibility of time division multiplexing the uplink spectrum resources by the D2D device is high, so that simultaneous transceiving does not need to be supported, and only either transmission or reception is needed at one time. In Rel-12/13, D2D scenarios can be classified into 3 types with network coverage, partial network coverage, and no network coverage, as shown in fig. 1. D2D equipment is in the coverage range of the network equipment in the scene with network coverage; in the partial network coverage scene, one part of D2D equipment is in the coverage range of the network equipment, and the other part of D2D equipment is not in the coverage range of the network equipment; in a scenario without network coverage, all D2D devices are not in the coverage of the network device. If the terminal equipment can hear the signal of the network equipment, the terminal equipment is the terminal equipment in the network coverage; if the terminal equipment can hear signals of other terminal equipment in network coverage, the terminal equipment is partial network coverage terminal equipment; if the terminal equipment can not receive the signals of the network equipment and can not receive the signals of other terminal equipment in the network coverage, the terminal equipment is the terminal equipment outside the network coverage.

Vehicle to outside information exchange (V2X): in Rel-14/15/16, V2X has established itself well as a major application of D2D technology. The V2X optimizes the specific application requirements of the V2X based on the existing D2D technology, and needs to further reduce the access delay of the V2X device and solve the problem of resource conflict. V2X specifically includes three application requirements of vehicle to vehicle (vehicle to vehicle, V2V), vehicle to pedestrian (V2P), vehicle to infrastructure (infrastructure) communication or network (V2I/N), as shown in fig. 2. Specifically, V2V refers to inter-vehicle communication based on a Long Term Evolution (LTE) system; V2P refers to LTE-based vehicle-to-person communication (including pedestrians, cyclists, drivers, or passengers); V2I refers to LTE based vehicle to roadside unit (RSU) communication, and in addition, a V2N may be included in V2I, V2N refers to LTE based vehicle to base station/network communication. Roadside devices include two types: the RSU of the terminal type is in a non-mobile state because the RSU is distributed on the roadside, and the mobility does not need to be considered; the RSU, being of the base station type, can provide timing synchronization and resource scheduling to the vehicle with which it communicates.

Fig. 3 is a schematic diagram of four possible scenarios to which embodiments of the present application may be applied. In the coordinate system shown in fig. 3, the vertical axis is the time axis in microseconds (us) and the horizontal axis is the frequency axis in megahertz (MHz). Carrier 1 and carrier 2 are two different carriers.

It should be understood that, in this embodiment of the present application, only an example that a plurality of terminal devices operate on two carriers is taken as an example for description, in practice, a terminal device may also operate on a plurality of carriers, such as 3 carriers, 5 carriers, and the like, which is not limited in this embodiment of the present application.

Scene 1: the center frequency point of the BWP is transformed. Corresponding to the terminal device 1 operating on the carrier 1 in fig. 3, the bandwidth of the working BWP before switching is 100MHz, the central frequency point is 50MHz, and the central frequency point of the working BWP after switching is 150MHz, but the bandwidth of the BWP is not changed.

Scene 2: the bandwidth of the BWP is transformed, but the center frequency point of the BWP is not transformed. Corresponding to the terminal device 2 working on the carrier 2 in fig. 3, the working BWP bandwidth before switching is 100MHz, the central frequency point is 100MHz, and the working BWP bandwidth after switching is 200MHz, but the central frequency point is still 100MHz without conversion.

Scene 3: and simultaneously converting the center frequency point and the bandwidth of the BWP. Corresponding to the terminal device 3 working on the carrier 1 in fig. 3, the working BWP bandwidth before switching is 200MHz, the central frequency point is 100MHz, the working BWP bandwidth after switching is 100MHz, the central frequency point is 350MHz, and the working BWP bandwidth and the central frequency point are both changed before and after switching.

Scene 4: the center frequency point and bandwidth of BWP are not transformed, and only some baseband configurable parameters are transformed. Corresponding to the terminal device 4 working on the carrier 2 in fig. 3, the working BWP bandwidth before switching is 100MHz, the central frequency point is 350MHz, the working BWP bandwidth after switching is 100MHz, the central frequency point is 350MHz, and before and after switching, the working BWP bandwidth and the central frequency point are not transformed, and only some parameters of the baseband, such as Subcarrier spacing (SCS) and Cyclic Prefix (CP) types, are transformed.

When the four scenes are subjected to BWP switching in different frequency ranges, the switching delay requirements are different. Currently, the corresponding Frequency ranges are divided into Frequency Range 1 (Frequency Range 1, fr1) and Frequency Range 2 (Frequency Range 2, fr2), wherein FR1 corresponds to frequencies less than 6GHz and fr2 corresponds to frequencies greater than 6GHz. Table 1 shows the handover latency parameters of BWP in different frequency ranges for the four different scenarios shown in fig. 3.

TABLE 1 BWP handoff delay parameters

The type1 and the type2 in table 1 indicate two types of BWPs, and the BWP handover delays corresponding to different BWP types are different, and as can be seen from table 1, the BWP handover delay corresponding to the type2 is greater than the BWP handover delay corresponding to the type1 for the same scenario. For example, in scenario 1, the BWP handover latency corresponding to type1 is 600us, and the BWP handover latency corresponding to type2 is 2000us; in scenario 4, the BWP handover latency for type1 is 400us, and the BWP handover latency for type2 is 950us.

Further, as can be seen from table 1, in any scenario, any type of BWP performs handover, which results in a certain handover delay (maximum 2000us, minimum 400 us). When there are multiple terminal devices performing BWP handover in the communication process, due to inconsistent handover time, even though the handover is performed simultaneously, due to different handover delays of different types of BWPs, when one part of the terminal devices completes the BWP handover and the other part of the terminal devices does not complete the BWP handover, the communication transmission may be interrupted, which may affect the communication service and reduce the communication quality and reliability. Therefore, when the terminal device performs BWP switching, the interruption caused by BWP switching is reduced as much as possible, and the impact of BWP switching on communication quality and reliability is reduced.

The embodiment of the application provides a communication method, which can effectively reduce communication interruption caused by BWP switching and improve communication quality and reliability.

Fig. 4 is a schematic flow chart of a communication method 400 provided by an embodiment of the present application. The method 400 includes S401 to S408, where S402 to S405, S407, and S408 are optional steps. These steps will be described in detail below.

In the embodiment of the present application, the first terminal device obtains the configuration information of the BWPs corresponding to the at least two connection states, and switches the first terminal device from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information, so that communication interruption caused by the first terminal device during BWP switching is reduced, and communication reliability is improved.

S401, the first terminal device obtains configuration information of the bandwidth portion BWP corresponding to at least two connection states respectively.

The connection state is a connection state between the terminal device and the network device, and includes a connection state, an off-network state and an idle state. The at least two connection states respectively correspond to a BWP for the sidelink.

It should be noted that for ease of description, BWPs not illustrated hereinafter are all referred to as sidelink BWPs.

In the method provided by the embodiment of the present application, different connection states of the terminal device correspond to corresponding BWPs, so that BWP handover may exist when the connection state of the terminal device and the network device changes. For example, when the terminal device changes from the connected state to the idle state or changes from the idle state to the connected state, the terminal device needs to switch from a BWP corresponding to the connected state to a BWP corresponding to the idle state for normal communication. Before the terminal device performs BWP switching, it needs to acquire corresponding configuration information, and the terminal device performs the BWP switching according to the acquired configuration information.

Optionally, the connection state of the terminal device changes differently, and the BWP handover is performed differently. For example, the terminal device switches between the BWP corresponding to the connected state and the BWP corresponding to the outside of the network; and/or the terminal equipment switches between the BWP corresponding to the connected state and the BWP corresponding to the idle state; and/or the terminal device switches between the corresponding BWP outside the network and the corresponding BWP in the idle state.

Optionally, the BWPs corresponding to the at least two connection states may be one BWP corresponding to the idle state and at least one BWP corresponding to the outside of the network; or, one BWP corresponding to the idle state and at least one BWP corresponding to the connected state; or at least one BWP corresponding outside the network and/or at least one BWP corresponding in a connected state.

Optionally, the configuration information may be sent by the network device to the first terminal device. For example, the network device sends the configuration information to the first terminal device through configured broadcast or multicast configuration signaling. The configuration signaling may be a System Information Block (SIB), radio Resource Control (RRC), media Access Control (MAC), or downlink control signal (DCI).

S402, the first terminal device sends, to the network device, the BWP handover latency type supported by the first terminal device.

In order to achieve simultaneous switching of multiple BWPs, communication interruption due to BWP switching is reduced, so that all BWP switching needs to be completed at the same time. Since the switching time is related to the type of BWP, the switching latency is different depending on the type of BWP as shown in table 1. Therefore, before performing BWP handover, the terminal device performing BWP handover reports the supported BWP handover latency type to the network device.

S403, the network device determines a first switching duration.

The network device determines, according to the table 1, a switching duration corresponding to the BWP supported by the terminal device according to the supported BWP switching delay type reported by the first terminal device. And determining the maximum value of the switching delay in the BWP switching delay types supported by the first terminal equipment reported by the first terminal equipment as a first switching duration.

For example, when the communication service is a unicast service, the first switching duration is a maximum value of the switching delays respectively reported by the pair of terminal devices serving as unicast; when the communication service is a multicast service, the switching duration is the maximum value of the switching time delay respectively reported by the group of terminal equipment for multicast; when the communication service is a broadcast service, the switching delay is the maximum value of the switching delays reported by all the terminal equipment making the broadcast. Determining the maximum value of BWP switching time delay corresponding to the terminal equipment according to different communication service types, determining the maximum switching time delay as the first switching time length for carrying out BWP switching, ensuring to complete a plurality of BWP switching at the same time, and improving communication quality and reliability.

Alternatively, when the first terminal device switches from the first BWP to the second BWP, the communication system may predefine the first switching duration as the maximum value of the switching delays corresponding to all types of BWPs according to the existing switching delay types of several BWPs. At this time, steps S402 and S403 may not be performed.

For example, as shown in table 1, when the BWP handover latency parameter has a maximum BWP handover latency of 2000us for type1 and BWP handover latency of type2 in frequency range 1 and frequency range 2, the predefined first handover duration may be 2000us, and the terminal device performing BWP handover may complete BWP handover within the handover duration of 2000us.

It should be noted that the above method for predefining the first switching time period is only for illustration, and the embodiment of the present application does not limit this.

S404, the first terminal device obtains a first switching duration.

The network device determines a first switching time length according to the supported BWP switching delay type reported by the first terminal device, and then sends the first switching time length to the first terminal device.

Optionally, in the BWP handover procedure, since the handover delays of different types of BWPs are different, in order to ensure simultaneous handover of multiple BWPs, the first terminal device does not transmit data for the first handover duration after the start of the handover.

For example, the first switching duration is 5ms, and the time consumed by the first terminal device to switch from the sidelink first BWP to the sidelink second BWP is 2ms, then in the remaining 3ms, the first terminal device does not transmit any data until the first switching duration ends, that is, in the first switching duration, the switching is completed by the switched BWPs at the same time in the same time, thereby avoiding the switching of BWPs causing multiple communication terminals and improving the communication reliability.

Alternatively, this step S404 may not be performed when the communication system predefines the first handover duration.

S405, the first terminal device acquires the switching indication information of the BWP. That is, the first terminal device receives switching indication information from the network device or the second terminal device, where the switching indication information is used to indicate that the first terminal device switches from the first BWP to the second BWP.

Optionally, when performing the sidelink BWP handover, the first terminal device needs to acquire, in addition to the configuration information of the BWP before the handover and the configuration information of the BWP after the handover, handover indication information of the BWP before the handover, where the handover indication information is used to indicate the first terminal device to perform the BWP handover, for example, to switch from the first BWP to the second BWP.

Optionally, when the first terminal device is in different connection states, the manner of obtaining the switching indication information is different.

For example, when the first terminal device is in a connected state, the switching indication information is sent to the first terminal device by the network device, and the first terminal device receives the switching indication information from the network device.

Alternatively, when a plurality of terminal apparatuses exist in the communication system, some of the terminal apparatuses are outside the network, and when the network apparatus transmits the handover instruction information to the terminal apparatus through a downlink control signal (DCI), the terminal apparatus outside the network cannot communicate with the network apparatus, and cannot receive the handover instruction information. In this case, the handover instruction information may be transmitted to a terminal device outside the network through sidelink communication according to a terminal device within the network. For example, when the first terminal device is outside the network, the first terminal device receives the handover indication information from the second terminal device. It should be understood that the second terminal device is a terminal device within the network, and is used for example only.

For example, as shown in fig. 5, there are 3 terminal devices under the network device, namely, a first terminal device, a second terminal device, and a third terminal device. The first terminal device may receive, in the network, the handover indication information transmitted by the network device through the DCI, but the second terminal device and the third terminal device outside the network cannot receive the handover indication information transmitted by the network device through the DCI, and then the first terminal device transmits the received handover indication information transmitted by the network device through the DCI to the second terminal device and the third terminal device through sidelink control Signal (SCI). For example, the first terminal device sends the handover indication information to the second terminal device.

Alternatively, the switching indication information may indicate BWP switching of the first terminal device and the second terminal device in unicast, or the switching indication information may indicate BWP switching of a plurality of terminal devices in multicast or broadcast, wherein the plurality of terminal devices includes the first terminal device.

Optionally, the first terminal device may further receive the handover indication information in a handover preparation window, and in the handover preparation window, the network device sends the handover indication information multiple times, so that the multiple terminal devices all receive the handover indication information before the handover starts.

Alternatively, the first terminal device outside the network may receive the handover indication information within a handover preparation window, and in the handover preparation window, the second terminal device inside the network sends the handover indication information multiple times, so that the first terminal device receives the handover indication information before the handover starts.

Optionally, the handover indication information includes configuration information of the handover preparation window, where the configuration information of the handover preparation window includes at least one of: switching configuration information of the preparation window duration; switching configuration information of preparation window start time; and switching configuration information of the end time of the preparation window.

It should be understood that the configuration information of the handover preparation window may also be sent before the handover indication information, which is not limited in this embodiment of the application. As shown in fig. 6, the first terminal device operates on BWP1, and the switching indication information indicates that the first terminal device switches from BWP1 to BWP 2. In order to enable the communicating terminal device to reliably receive the handover indication information and avoid that BWP handover cannot be performed simultaneously due to missed DCI detection, the network device needs to send a DCI message to the terminal device performing BWP handover in the network multiple times, for example, as shown in fig. 6, the DCI message is sent in 5 handover preparation windows respectively, and the DCI message sent by the network device multiple times may be the same content or different in content, which is not limited in this embodiment of the present application.

Optionally, the handover indication information is further used to indicate at least one of the following information: the moment when the handover starts; the time when the switching is completed, or the length of time for performing BWP switching; a transmission resource on a second BWP.

The switching indication information indicates that the first terminal device switches from the first BWP to the second BWP according to the indication information.

For example, the first terminal device successfully detects a PDCCH corresponding to an RNTI triggering BWP handover, and the first terminal device is handed over from a first BWP corresponding to a connected state to a second BWP corresponding to the connected state.

Alternatively, the handover indication information indicates when to stop the BWP handover by indicating the time when the handover starts and the time when the handover is completed, i.e. from when the first terminal device starts to perform the BWP handover. For example, if the switching instruction information indicates that the start time is 1ms and the switching completion time is 3ms, the first terminal device starts BWP switching at the time of 1ms and ends BWP switching at the time of 3 ms.

Optionally, the switching indication information may also indicate the time when the switching starts and the duration of performing the BWP switching. For example, if the switching indication information indicates that the BWP switching start time is 1ms and the switching duration is 3ms, the first terminal device starts to perform BWP switching at the 1ms time, and the switching process lasts for 3ms and then the BWP switching ends, that is, the BWP switching ends at the 3ms time.

Optionally, the handover indication information may also indicate the time when the handover is completed and the duration of performing the BWP handover. For example, the switching indication information indicates that the time when the BWP switching is completed is 3ms, and the switching duration is 3ms, the first terminal device starts to perform BWP switching at the time of 1ms, and after the switching process lasts for 3ms, the BWP switching ends, that is, the BWP switching ends at the time of 3 ms.

Optionally, the handover indication information is further configured to indicate handover of M BWPs currently activated by the first terminal device, where M is a positive integer greater than 1.

Optionally, the M BWPs include a sidelink BWP and a cellular link BWP.

The M BWPs may be on the same carrier or different carriers, which is not limited in this embodiment of the present invention.

Before the simultaneous switching of the M BWPs, the first terminal device reports the following information to the network device: whether simultaneous handover of the cellular link BWP and the sidelink BWP is supported; or supporting simultaneous switching of the total number of the cellular link BWPs and the sidelink BWPs; and/or the number of simultaneous handovers of the cellular link BWP and the number of BWPs supporting simultaneous handovers in the sidelink BWP under the condition that simultaneous handovers of the cellular link BWP and the sidelink BWP are supported; or supporting the handover latency or handover latency type of the cellular link BWP and the handover latency or handover latency type of the sidelink BWP simultaneously under the condition of supporting the simultaneous handover of the cellular link BWP and the sidelink BWP.

For example, before the simultaneous handover of the M BWPs, the first terminal device needs to report to the network device whether to allow the simultaneous handover of the cellular link BWP and the sidelink BWP, and if not, the simultaneous handover of the M BWPs is not performed; if yes, reporting the total number of the cellular link BWPs and the sidelink BWPs that support simultaneous handover, for example, N, where N is a positive integer less than or equal to M. And reporting the number and type of the cellular links BWP and the number and type of the sidelink BWP in the N simultaneous switching BWPs, thereby determining the first switching duration and realizing the N simultaneous switching including the cellular links BWP and the sidelink BWP.

S406, the first terminal device switches from the first BWP to the second BWP according to the configuration information of the first BWP, the configuration information of the second BWP and the switching indication information in the configuration information.

When the first terminal device switches from the first BWP to the second BWP, the configuration information used is only the configuration information of the first BWP before the switching and the configuration information of the second BWP after the switching. The first terminal device may include different scenarios for switching from the first BWP to the second BWP depending on the difference of the at least two connection states.

Optionally, in this application, the configuration information of the first BWP and the configuration information of the second BWP may be from the same message, or may be from different messages, or may be from different parts in the same message. For example, the information may be sent to the terminal device through the same SIB or RRC message or a preconfiguration message, may be sent to the terminal device through different SIB messages or different RRC messages or different or preconfiguration messages, or may be sent to the terminal device through different fields or different portions of a message body in one SIB message or one RRC message or one preconfiguration message, which is not limited in this embodiment of the present invention.

For example, the first BWP is the BWP corresponding to the connected state, and the second BWP is the BWP corresponding to the connected state; or the first BWP is a BWP corresponding to a connected state, and the second BWP is a BWP corresponding to an idle state; or the first BWP is corresponding to the connected state, and the second BWP is corresponding to the outside of the network; or the first BWP is a BWP corresponding to an idle state, and the second BWP is a BWP corresponding to a connected state; or the first BWP is a BWP corresponding to an idle state, and the second BWP is a BWP corresponding to the outside of the network; or the first BWP is a corresponding BWP outside the network, and the second BWP is a corresponding BWP in a connected state; or the first BWP is a BWP corresponding to outside the network, and the second BWP is a BWP corresponding to an idle state.

Optionally, the step S405 may be for the first terminal device to switch from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information, and a preconfigured switch condition.

Wherein the preconfigured switching condition is a correspondence between switching of connection state of the first terminal device and BWP switching.

Optionally, the preconfigured switching condition may be preconfigured by the system, or predefined in a protocol, or may be configured after the network device receives the information reported by the first terminal device and reports the information to the network device when the connection state of the first terminal device is switched, which is not limited in this embodiment of the present application.

The system is configured in advance, which means that communication related parameters or configuration information are pre-configured in advance into the communication terminal equipment. This method can be used in a scenario outside network coverage, because the terminal device is not connected to the network device at this time, and the configuration information can only be obtained in this way.

Alternatively, the information may be pre-configured by writing it in advance to a buffer of the terminal device.

Optionally, the preconfigured switching condition comprises: under the condition that the first terminal device is switched from a connected state to an idle state, the first terminal device is switched from one BWP in at least one BWP corresponding to the connected state to one BWP corresponding to the idle state; or under the condition that the first terminal device is switched from an idle state to a connected state, the first terminal device is switched from a BWP corresponding to the idle state to a BWP in at least one BWP corresponding to the connected state; or under the condition that the first terminal device is switched from the connected state to the outside of the network, the first terminal device is switched from one BWP corresponding to the connected state to one BWP in at least one BWP corresponding to the outside of the network; or in the case that the first terminal device is switched from outside the network to the connected state, the first terminal device is switched from a BWP corresponding to outside the network to one BWP of at least one BWP corresponding to the connected state; or under the condition that the first terminal device is switched to an idle state from outside the network, the first terminal device is switched to a BWP corresponding to the idle state from a BWP corresponding to the outside of the network; or under the condition that the first terminal device is switched from the idle state to the outside of the network, the first terminal device is switched from the BWP corresponding to the idle state to one BWP in the at least one BWP corresponding to the outside of the network.

Optionally, for all scenarios of BWP handover corresponding to existing state handover of the terminal device, the communication system may pre-configure corresponding BWP handover conditions according to different state handovers of the terminal device. For example, the correspondence of the preconfigured switching conditions with the first terminal device state switching as shown in table 2 is predefined.

Table 2 preconfigured correspondence of switching condition and first terminal device status switching

First terminal equipment connection state switching	Identification	Pre-configured switching conditions
			Switching from a connected state to an idle state	1	Condition 1
Switching from idle to connected state	2	Condition 2
			Switching the connection state to outside of the network	3	Condition 3
Out-of-network switching to connected state	4	Condition 4
			Network out-of-network switching to idle state	5	Condition 5
Switching to outside of network in idle state	6	Condition 6

As shown in table 2, there is a one-to-one correspondence between the connection state switching, the identifier, and the preconfigured switching condition of the first terminal device. The preconfigured switch conditions 1 to 6 in turn correspond to the preconfigured conditions listed above. For example, preconfigured switch condition 1 is that the first terminal device switches from one BWP in the at least one BWP corresponding to the connected state to one BWP corresponding to the idle state, preconfigured switch condition 2 is that the first terminal device switches from one BWP corresponding to the idle state to one BWP in the at least one BWP corresponding to the connected state, and so on, preconfigured switch condition 6 is that the first terminal device switches from one BWP corresponding to the idle state to one BWP in the at least one BWP corresponding to outside the network. When the connection state of the first terminal device and the network device changes, the identification information corresponding to the state switching is fed back to the system according to different state changes, and the preconfigured switching condition is determined by looking up the table 2 according to the identification information. For example, when the first terminal device switches from the connected state to the idle state, the identification information 1 is fed back to the system. According to the predefined mapping relationship between the preconfigured switching condition and the state switching of the first terminal device, the system determines that the corresponding preconfigured switching condition is condition 1 according to the identification information, and then the first terminal device switches from one BWP of the at least one BWP corresponding to the connected state to one BWP corresponding to the idle state according to the corresponding preconfigured switching condition.

For example, the first terminal device starts random access from an idle state in the serving cell, and if the random access procedure is successful, the connection state of the first terminal device and the network device changes from the idle state to a connection state, and the first terminal device switches from a first BWP corresponding to the idle state to a second BWP corresponding to the connection state. If the random access process fails, the connection state of the first terminal device and the network device is still in an idle state, and the first terminal device still works on the first BWP corresponding to the idle state, without performing BWP handover.

The foregoing mainly describes several scenarios for the first terminal device to perform BWP handover, and in practical operation, the scenarios for the first terminal device to perform BWP handover may include at least one of the scenarios.

In addition, communication can be performed normally between terminal devices in the same connection state, for example, communication between 10 terminal devices in a connection state or communication between 10 terminal devices in an idle state. However, communication between terminal devices in different connection states may be affected, for example, information sent by a terminal device in a connection state cannot be received by a terminal device in an idle state.

In order to improve the communication reliability between the terminal devices in different connection states, when the terminal devices in different connection states communicate with each other, the configuration information may further include the time-frequency resources of the sidelink BWP of the terminal devices in different connection states.

Optionally, the configuration information may further include time-frequency resources of the sidelink BWP of the terminal device in different connection states. The sending time-frequency resource and the receiving time-frequency resource of the terminal device are both located in a sidelink BWP, and in order to ensure the communication reliability, the receiving time-frequency resource of the sidelink BWP for the terminal device in the connected state is a subset of the receiving time-frequency resource of the sidelink BWP for the terminal device in the idle state; and/or the receiving time-frequency resource of the side link BWP for the terminal equipment outside the network is a subset of the receiving time-frequency resource of the side link BWP for the terminal equipment in an idle state; and/or the receiving time-frequency resource of the sidelink BWP for the terminal device in the connected state is a subset of the receiving time-frequency resource of the sidelink BWP for the terminal device outside the network; and/or the receiving time-frequency resource of the sidelink BWP for the terminal device in the idle state is a subset of the receiving time-frequency resource of the sidelink BWP for the terminal device outside the network.

Optionally, the sending time-frequency resource of the sidelink BWP for the terminal device in the idle state is the same as the sending time-frequency resource for the terminal device in the connected state; and/or the sending time-frequency resource of the side link BWP used for the terminal equipment in the idle state is the same as the sending time-frequency resource used outside the network; and/or the sending time-frequency resource of the side-link BWP used for the terminal equipment outside the network is the same as the sending time-frequency resource used in the connection state; and/or the sending time-frequency resource of the side-link BWP used for the terminal equipment outside the network is the same as the sending time-frequency resource used in the idle state.

For example, when there are 10 terminal devices in a connected state and 10 terminal devices in an idle state in a current communication system, and when the 10 terminal devices in the connected state and the 10 terminal devices in the idle state communicate with each other, a sidelink BWP between the connected states sends information on its corresponding sending time-frequency resource, in order to ensure that the communication is normal, the configuration information configures the receiving time-frequency resources of the 10 sidelink BWPs for the terminal devices in the connected state to be 1mhz, and the receiving time-frequency resources of the 10 sidelink BWPs for the terminal devices in the idle state to be 2MHz, that is, the receiving time-frequency resources of the sidelink BWP for the terminal devices in the idle state may include the receiving time-frequency resources of the sidelink BWP for the terminal devices in the connected state, so that the terminal devices in the idle state can also receive the information sent by the terminal devices in the connected state, and normal communication between the terminal devices in different connected states is achieved.

Steps S401 to S406 describe in detail the process of the first terminal device switching from the first BWP to the second BWP. After the BWP handover is completed, in order to further ensure that all BWPs are completed simultaneously, it may be checked after the BWP handover is completed whether all BWPs are completed.

S407, the first terminal device receives the first indication information sent by the network device.

After the first terminal device switches from the first BWP to the second BWP, the network device sends first indication information to the first terminal device, wherein the first indication information is used for the first terminal device to determine that the sidelink first BWP switching is successful.

Optionally, the first indication information may include at least one of the following: indication information of the first BWP; indication information of the second BWP; time interval information indicating an interval between a start time or a completion time of a handover from the sidelink first BWP to the sidelink second BWP and a transmission time of the first indication information.

Alternatively, the first indication information may be sent on the BWP before the handover, or may be sent on the BWP after the handover. When the first indication information is sent on the BWP before the handover, if the terminal device receives the first indication information, it indicates that the terminal device has not successfully handed over. Similarly, when the first indication information is sent on the switched BWP, if the terminal device does not receive the first indication information, it indicates that the terminal device has not successfully switched. In this way, it can be determined whether the terminal device is successfully handed over.

Optionally, step S408 is further included, where the first terminal device sends second indication information to the network device.

The second indication information is used to determine that the first BWP handover is successful.

Optionally, the second indication information includes any one of the following: indication information of the first BWP; indication information of the second BWP; an indication that the BWP handover was successful.

For example, when the BWP handover success indication in the second indication information is 1, it indicates that the first BWP handover is successful; or when the successful BWP handover indication is T, the successful BWP handover is indicated, and the embodiment of the present invention is not limited by this.

Alternatively, when multiple BWPs are activated simultaneously, if any one of the activated BWPs is switching, it may cause service interruption to the other active BWPs that are working simultaneously. In order to reduce the mutual influence of multiple BWPs activated simultaneously during the handover process, an embodiment of the present application proposes a method for simultaneous handover of multiple BWPs, and fig. 7 is a schematic flowchart of a communication method 700 provided in this embodiment of the present application.

S710, a first terminal device obtains first handover indication information sent by a network device, where the first handover indication information is used to indicate handover of currently activated M BWPs, and M is a positive integer greater than 1.

It should be understood that the currently activated M BWP link types may be the same or different, and for example, the currently activated M BWP link types may be M sidelink, M cellular links, or M sidelink and cellular link, which is not limited in this embodiment of the present invention.

Optionally, the currently activated M BWPs may be on the same carrier or on different carriers, which is not limited in this embodiment of the present invention.

S720, the first terminal device performs BWP handover according to the first handover indication information.

Before the current activated M BWPs are switched simultaneously, the first terminal device reports the following information to the network device: whether simultaneous handover of the cellular link BWP and the sidelink BWP is supported; or supporting simultaneous switching of the total number of the cellular link BWPs and the sidelink BWPs; and/or the number of simultaneous handovers of the cellular link BWP and the number of BWPs supporting simultaneous handovers in the sidelink BWP under the condition that simultaneous handovers of the cellular link BWP and the sidelink BWP are supported; or a handover latency type supporting simultaneous handover of the cellular link BWP and a handover latency or a handover latency type of the sidelink BWP, on the condition that simultaneous handover of the cellular link BWP and the sidelink BWP is supported.

For example, before the currently activated M BWPs are simultaneously switched, the first terminal device needs to report to the network device whether to allow the simultaneous switching of the cellular link BWP and the sidelink BWP, and if not, the simultaneous switching of the M BWPs is not performed; if yes, reporting the total number of the cellular link BWP and the sidelink BWP supporting simultaneous handover, for example, N is a positive integer less than or equal to M. And reporting the number and type of the cellular links BWP and the number and type of the sidelink BWP in the N BWPs which are switched simultaneously, thereby determining the first switching duration and realizing the N simultaneous switching comprising the cellular links BWP and the sidelink BWP.

The M BWPs may be on one carrier or multiple carriers, which is not limited in this embodiment of the present invention.

Further, before performing BWP handover of the sidelink according to the first handover indication information, the terminal device reports the following information to the network device: whether simultaneous handover of BWP of the cellular link and BWP of the sidelink is supported; or a total number of BWPs supporting simultaneous switching of the cellular link and the sidelink; and/or supporting the number of simultaneous switching BWPs of the cellular link and the number of simultaneous switching BWPs in the BWPs supporting the sidelink under the condition of supporting simultaneous switching BWPs of the cellular link and BWPs of the sidelink; or a handover latency or handover latency type that supports simultaneous handover of the BWP of the cellular link and the BWP of the sidelink; or a handover latency or handover latency type for BWP supporting multiple identical links. Whether simultaneous activation of more than one BWP is supported. Wherein, the more than one BWPs may be multiple BWPs of one type, or multiple BWPs of multiple types. Whether simultaneous handover is supported for more than one BWP; or a handover latency or handover latency type that supports simultaneous handover of the BWP of the cellular link and the BWP of the sidelink; or a handover latency or handover latency type of BWP supporting multiple identical links.

For example, when the reported information is 1, the BWPs indicating switching are of the same type, and when the reported information is 0, the BWPs indicating switching are of multiple types; alternatively, when the reported information is 0, the BWPs instructing to perform handover are of the same type, and when the reported information is 1, the BWPs instructing to perform handover are of multiple types, which is not limited in this embodiment of the present invention.

The reported information may include the number of BWPs supported for simultaneous activation. For example, when the reported information indicates that simultaneous activation of multiple BWPs of one type is supported, the reported information may further include the number of BWPs of the same type that are simultaneously activated; when the reported information indicates that simultaneous activation of multiple BWPs of multiple types is supported, the reported information may further include the number of BWPs of the same type that are simultaneously activated, where the number is specifically the number of BWPs of the cellular link and the number of BWPs of the sidelink when the multiple types include BWPs of the cellular link and BWPs of the sidelink.

The first handover indication information further includes handover duration information for performing a plurality of active BWPs. Since the switching duration of BWP is related to the types of BWPs, the terminal device needs to report the type of BWP supporting simultaneous activation to the serving base station before performing BWP switching, and determine the switching duration of BWP according to the BWP type.

For example, when the BWPs are 3 BWPs, respectively BWP1, BWP2 and BWP3, BWP1 and BWP2 are type1, and BWP3 is type2. When these 3 BWPs are switched simultaneously, it can be seen from table 1 that BWP1 and BWP2 have a switching delay of 600us and BWP3 has a switching delay of 2000us. Assuming that the switching time delay 600us of BWP1 and BWP2 is selected as the switching time duration for switching BWP1, BWP2 and BWP3 simultaneously, in the switching process, after BWP1 and BWP2 are switched, since the switching time delay of BWP3 is 2000us greater than 600us, BWP3 has not been switched yet, and there will be traffic interruption for BWP1 and BWP2 that have been switched. Therefore, when indicating the switching duration, the maximum value of the switching latencies of the 3 BWPs should be selected as the switching duration of the simultaneous switching, i.e. the switching latency 2000us of BWP3 should be selected as the switching duration of the simultaneous switching of BWP1, BWP2, BWP 3.

Further, when the communication service is a unicast service, the switching duration is the maximum value of the switching time delay reported by the pair of terminal devices which do unicast respectively; when the communication service is a multicast service, the switching duration is the maximum value of the switching time delay reported by the group of terminal equipment for multicast respectively; when the communication service is a broadcast service, the switching delay is the maximum value of the switching delays reported by all the terminal equipment making the broadcast.

The maximum value of the switching time delay of the BWP corresponding to the terminal equipment is determined according to different communication service types, the maximum value is determined as the switching time length of the sidelink, a plurality of BWPs which are simultaneously activated can be ensured to be simultaneously switched, the interrupt interference caused by the plurality of BWPs which are simultaneously activated in the switching process is reduced, and the communication quality and the reliability are improved.

Optionally, the first handover indication information includes any one or more combinations of SIB, RRC, MAC CE, or DCI for carrying, which is not limited in this embodiment of the present invention.

Since in the embodiment of the present application, after receiving the first switching indication information, the multiple BWPs need to be switched simultaneously, in order to accurately implement the switching of the multiple BWPs, the first switching indication information needs to include the indication information of each BWP in the multiple BWPs before switching and the BWP indication information after switching, so that the multiple BWPs can accurately complete the switching simultaneously.

Taking 2 BWPs (BWP 1 and BWP 2) as an example, the first switching indication information includes the indication information before switching BWP1, the indication information may be BWP1, the corresponding indication information after switching is BWP3, and correspondingly, the indication information before switching corresponding to BWP2 is BWP2, and the indication information after switching is BWP4. BWP1 switches to BWP3 and BWP2 switches to BWP4 after receiving the first indication information.

If the BWPs operate on a shared carrier in a frequency-division or time-division manner, the indication information of the BWP before the handover included in the first handover indication information may be the frequency or time at which the BWPs operate respectively, and the indication information of the BWP after the handover may be the frequency or time at which the BWP is handed over to.

It should be understood that the indication information of the BWP before the handover and the indication information of the BWP after the handover included in the first handover indication information may also be other information with a flag, which is not limited in this embodiment of the application.

In the embodiment of the application, the first terminal device switches the currently active M BWPs simultaneously according to the acquired first switching indication information, so that interruption interference caused by switching of a part of BWPs in a plurality of BWPs working simultaneously on other active BWPs is reduced, and the communication reliability is improved.

Fig. 8 shows a schematic flow chart of a communication method 800 provided by an embodiment of the present application.

S810, the first terminal device obtains configuration information of a timer corresponding to the first bandwidth portion BWP of the sidelink.

And the network device sends the configuration information of the timer corresponding to the first BWP of the sidelink to the first terminal device.

And S820, the first terminal equipment manages the timer according to the configuration information of the timer.

When the timer expires, switching from the sidelink first BWP to a sidelink second BWP, where the sidelink first BWP is a currently activated BWP of the sidelink and the sidelink second BWP is an idle BWP of the sidelink of the terminal device or a BWP for the sidelink outside the network.

It should be noted that the expiration of the timer means that the value of the timer exceeds the duration of a defined timer, where the duration of the timer may be predefined, configured by signaling, or preconfigured, which is not limited in this embodiment of the present application.

Optionally, when the timer expires, if the terminal device is in the connected state, the terminal device sends, to the network device, indication information indicating that the timer expires or indication information indicating that the sidelink BWP of the terminal device is switched. When the network device receives the indication information, the sidelink first BWP switches to the sidelink second BWP.

In the above technical solution, the receiving end terminal device manages the timer according to the configuration information of the timer by acquiring the configuration information of the timer. Specifically, managing the timer according to the timer configuration information includes timer start/restart, timer step size plus one, or timer expiration. When the timer expires, switching of the BWP of the sidelink is performed. The influence of the disconnection of the receiving terminal equipment on the communication quality in the communication process is reduced, and the communication reliability is improved.

Optionally, the configuration information of the timer may include a step size of the timer and/or a duration of the timer. In particular, the step size of the timer and/or the duration of the timer is associated with at least one of the following parameters: the traffic type of the sidelink; quality of service (QoS) parameters for the sidelink; subcarrier spacing (SCS) value of the lateral link; a resource pool used by the sidelink; the waveform type of the sidelink. When any of the above parameters are different, the step size of the corresponding timer and/or the duration of the timer are different.

For example, the step size and/or period setting of the timer may be smaller when the QoS requirements are higher (e.g., low latency requirements) or the SCS is larger (e.g., 60 kHz), or larger when the QoS requirements are lower or the SCS is smaller.

Alternatively, the step size of the timer may be included in the transmission resource of the sidelink.

It should be noted that the state of the timer also includes timer running, timer start/restart.

During communication, when the terminal device satisfies a first condition, a timer corresponding to the first BWP of the sidelink is started or restarted. Wherein the first condition is any one of the following conditions: when the terminal equipment is in a connected state, successfully detecting DCI of a scheduling cellular link sent by the serving base station; when the terminal equipment successfully detects downlink control information DCI of a scheduling side uplink sent by the first terminal equipment; when the terminal equipment sends a buffer state of a sidelink, a scheduling request of the sidelink, a hybrid automatic repeat request (HARQ) response message of the sidelink or a Channel State Information (CSI) feedback message of the sidelink to a serving base station or a first terminal equipment; when the terminal device successfully detects the SCI of the sidelink.

Optionally, when the terminal device successfully receives the control information, an Acknowledgement (ACK) information response message may be sent to the network device, and the timer is started or restarted.

Optionally, in some alternative embodiments, the ACK information may be 1 or more. For example, in a unicast field, the network device receives an ACK message from the terminal device; it may be that the network device receives multiple ACK messages of other terminal devices in a multicast or broadcast scenario.

It should be understood that when the terminal device satisfies any one of the above first conditions, if the timer is not started, the timer is started; if the timer is started and has not expired, the timer is restarted.

In the embodiment of the present application, when the terminal device successfully receives the control information, it indicates that the current communication between the terminal device and the network device is normal, and the understanding about the scheduling information between the network device and the terminal device is consistent.

Accordingly, when the timer is running and the timer does not detect any of the following information for the time corresponding to the step size, the value of the timer is increased: when downlink control information DCI of a scheduling cellular link is sent by network equipment; when downlink control information DCI of a scheduling side uplink is sent by network equipment; when ACK response information of a sidelink is received; sidelink control information SCI.

It should be noted that the ACK response message not detecting the sidelink may be any one of the downlink control information DCI of the scheduling cellular link transmitted by the network device, the downlink control information DCI of the scheduling sidelink transmitted by the access network, and the sidelink uplink control information SCI of the sidelink, the Negative Acknowledgement (NACK) NACK response message of the sidelink, and the timer value is increased. It may also be that, for the terminal device not detecting the ACK response message and the NACK response message, the terminal device sends Discontinuous Transmission (DTX) information to the network device, and the timer value is increased.

Alternatively, the NACK information may be 1 or more. For example, in a unicast field, a first terminal device receives NACK information of the terminal device; it may be that the first terminal device receives multiple NACK messages in a multicast or broadcast scenario.

In this embodiment, when the terminal device successfully receives the control information, it indicates that the current communication between the terminal device and the access network is abnormal, and the understanding about the scheduling information between the terminal device and the network device is inconsistent, and a certain terminal device in the network may be dropped or the BWP of the terminal device and the network device is different; or the terminal device is outside the network.

It should be noted that the ACK information or NACK information may be ACK or NACK feedback of hybrid automatic repeat HARQ, ACK or NACK feedback of automatic repeat ARQ, or the like.

In the above technical solution, whether to perform BWP handover of the sidelink may be determined according to the state of the timer.

When the timer expires, BWP handover of the sidelink is required. Wherein, the BWP switching of the sidelink can be that the terminal device switches from a sidelink first BWP in the connected state to a sidelink second BWP2 in the idle state; the terminal device can be switched from the second side link BWP in an idle state to the third side link BWP in an out-of-network state; the terminal device may also be switched from the sidelink first BWP in the connected state to a sidelink third BWP in the out-of-network state.

When the timer expires, the terminal device in the connected state reports indication information of the expired timer or indication information of BWP handover of the sidelink to the first terminal device.

Optionally, when the timer expires, indicating that the terminal device does not receive the corresponding scheduling signaling, and possibly the communication has been interrupted, the terminal device switches from the BWP of the current sidelink to a default BWP to re-access the communication system, so as to implement transmission. Wherein the default BWP is the BWP of the sidelink in the idle state.

In addition, if the first terminal device always sends a data packet to the terminal device but does not receive any information and is not received (for example, ACK or NACK information), it indicates that there is a problem in the communication between the first terminal device and the terminal device and an adjustment is needed, and at this time, the value of the first timer is increased.

The communication method proposed in the present application is described in detail above with reference to fig. 4 to 8. The following describes a communication apparatus proposed in the present application.

Referring to fig. 9, fig. 9 is a schematic diagram of a communication device 10 provided herein. As shown in fig. 9, the communication apparatus 10 includes a transceiver unit 910 and a processing unit 920.

In some possible implementations, the communication apparatus 10 may be a first terminal device corresponding to the method 400.

A transceiving unit 910, configured to execute step S401 in which a first terminal device obtains configuration information of a bandwidth portion BWP corresponding to at least two connection states sent by a network device, where the connection states are connection states between the terminal device and the network device, and the at least two connection states include an idle state, a connection state, or outside the network, and the BWPs corresponding to the at least two connection states are used in a sidelink.

The first BWP and the second BWP belong to at least two BWPs respectively corresponding to the connection state.

The transceiver unit 910 in the device 10 includes a receiving unit and a transmitting unit, and has both receiving and transmitting functions. For performing the steps of the first terminal device obtaining, receiving and sending information from the other device in performing the method embodiment. Optionally, the transceiving unit 910 is further configured to perform step S402 of sending, to the network device, the BWP handover latency type supported by the first terminal device.

Different BWP handover delay types correspond to different BWP handover delays, and in order to implement BWP handover simultaneously by the communicating terminal devices, the BWP handover delay type supported by the first terminal device is sent to the network device before the first terminal device is handed over, so as to determine the handover duration.

Optionally, the transceiver unit 910 is further configured to execute step S404 in which the first terminal device receives the first switching duration sent by the network device.

The first switching duration is the maximum value of the switching delay corresponding to the BWP switching delay type supported by the first terminal device, so as to ensure that the terminal devices communicating with each other can complete BWP switching at the same time. And the first terminal equipment does not send data within the time of the first switching duration after the switching is started until the first switching duration is finished.

Optionally, the transceiver unit 910 is further configured to execute step S405 in which the first terminal device acquires the handover indication information. Wherein the switching indication information is used for indicating the first terminal device to switch from the first BWP to the second BWP.

Optionally, when the first terminal device is in different connection states, the manner of obtaining the handover indication information is different.

For example, when the first terminal device is in a connected state, the switching indication information is sent to the first terminal device by the network device, and the first terminal device receives the switching indication information from the network device. When the first terminal equipment is out of the network, the first terminal equipment can not receive the information sent by the network equipment, and the first terminal equipment out of the network receives the switching indication information from the second terminal equipment. It should be understood that the second terminal device is a terminal device within the network, and is used for example only.

Optionally, the transceiving unit 910 is further configured to perform step S407 in which the first terminal device receives the first indication information from the network device.

Optionally, the transceiver unit 910 is further configured to execute step S408 in which the first terminal device sends the second indication information to the network device.

Wherein the first indication information and the second indication information are indication information for determining that the first terminal device is successfully switched after the first terminal device is switched from the first BWP to the second BWP.

Optionally, the first indication information may include at least one of: indication information of the first BWP; indication information of the second BWP; time interval information indicating an interval between a start time or a completion time of a handover from the sidelink first BWP to the sidelink second BWP and a transmission time of the first indication information.

Optionally, when BWPs of M first terminal devices are activated simultaneously, the transceiving unit 910 is further configured to send the following information to the network device: whether simultaneous handover of the cellular link BWP and the sidelink BWP is supported; or supporting simultaneous switching of the total number of the cellular link BWP and the sidelink BWP; and/or the number of simultaneous handovers of the cellular link BWP and the number of BWPs supporting simultaneous handovers in the sidelink BWP under the condition that simultaneous handovers of the cellular link BWP and the sidelink BWP are supported; or a handover latency type supporting simultaneous handover of the cellular link BWP and a handover latency or a handover latency type of the sidelink BWP, on the condition that simultaneous handover of the cellular link BWP and the sidelink BWP is supported.

The processing unit 920 performs the steps implemented or processed inside the first terminal device in the method embodiment. For example, the processing unit 920 is configured to execute step S406 of the first terminal device switching from the first BWP to the second BWP according to the configuration information of the first BWP, the configuration information of the second BWP and the switching indication information in the configuration information.

Optionally, the processing unit is further configured to perform a step of switching, by the first terminal device, from the first BWP to the second BWP according to the configuration information of the first BWP, the configuration information of the second BWP, and a preconfigured switch condition in the configuration information.

Optionally, in this application, the configuration information of the first BWP and the configuration information of the second BWP may be from the same message, or may be from different messages, or may be from different parts in the same message. For example, the SIB or RRC message or the preconfiguration message may be sent to the terminal device, different SIB messages or different RRC messages or different or preconfiguration messages may be sent to the terminal device, or different fields or different parts of a message body in one SIB message or one RRC message or one preconfiguration message may be sent to the terminal device, which is not limited in this application.

In some possible implementations, the communication apparatus 10 may be a first terminal device corresponding to the method 700. Optionally, the transceiving unit 910 is configured to perform step S710 in which the first terminal device receives the first switching indication information sent by the network device.

The first switching indication information is used to indicate switching of currently activated M BWPs, where M is a positive integer greater than 1.

Optionally, the processing unit 920 is configured to execute step S720 of the first terminal device performing M BWP handover according to the first handover indication information.

In some possible implementations, the communication apparatus 10 may be a first terminal device corresponding to the method 800. Optionally, the transceiving unit 910 is configured to perform step S810 in which the first terminal device receives the timer configuration information sent by the network device.

Optionally, the processing unit 920 is configured to execute step S820 in which the first terminal device manages the timer according to the configuration information of the timer.

Fig. 10 is a schematic structural diagram of a communication device 10 according to an embodiment of the present application. The communication device 10 may be a first terminal device 20, performing the functions of the first terminal device in the above-described method embodiments.

As shown, the first terminal device 20 includes a processor 210 and a transceiver 220. Optionally, the first terminal device 20 further includes a memory 230. The processor 210, the transceiver 220 and the memory 230 may communicate with each other via internal connection paths to transmit control and/or data signals, the memory 230 is used for storing a computer program, and the processor 210 is used for calling and running the computer program from the memory 230 to control the transceiver 220 to transmit and receive signals. Optionally, the first terminal device 20 may further include an antenna 240, configured to send out uplink data or uplink control signaling output by the transceiver 220 through a wireless signal.

The processor 210 and the memory 230 may be combined into a processing device, and the processor 210 is configured to execute the program codes stored in the memory 230 to implement the functions described above. In particular implementations, the memory 230 may be integrated into the processor 210 or may be separate from the processor 210. The processor 210 may correspond to a processing unit of the communication device 10.

The transceiver 220 may correspond to the transceiver unit 910 in fig. 9, and may also be referred to as a communication unit. The transceiver 220 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Wherein the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that the terminal device 20 shown in fig. 10 is capable of implementing the various processes involving the first terminal device in the method embodiments shown in fig. 4, 7 and 8. The operations and/or functions of the respective modules in the first terminal device 20 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

The processor 210 may be configured to perform the actions described in the previous method embodiments as being implemented internally by the first terminal device, and the transceiver 220 may be configured to perform the actions described in the previous method embodiments as being transmitted by the first terminal device to the network device or received from the network device. Please refer to the description in the previous embodiment of the method, which is not repeated herein.

Optionally, the first terminal device 20 may further include a power supply 250 for supplying power to various devices or circuits in the terminal device.

In addition, in order to improve the functions of the first terminal device, the first terminal device 20 may further include one or more of the input unit 260, the display unit 270, the audio circuit 280, the camera 290, the sensor 2100, and the like, and the audio circuit may further include a speaker 282, a microphone 284, and the like.

It should be noted that the communication apparatus 10 may also be the second terminal device or the third terminal device in any foregoing method embodiment, so as to implement the steps or functions of the second terminal device or the third terminal device in any foregoing implementation manner.

Referring to fig. 11, fig. 11 is a schematic diagram of a communication device 30 proposed in the present application. As shown in fig. 11, the apparatus 30 includes a processing unit 1110 and a transceiver unit 1120.

In some possible implementations, the communication apparatus 30 may be a network device to which the method 400 corresponds.

Optionally, the transceiving unit 1120 is configured to perform step S401 in which the network device sends configuration information of the bandwidth portion BWP corresponding to the at least two connection states to the first terminal device.

The transceiver 1120 of the device 30 includes a receiver and a transmitter, and has both receiving and transmitting functions. For performing the steps of a network device obtaining, receiving and sending information from other devices in performing embodiments of the method.

Optionally, the transceiving unit 1120 is configured to perform step S402 in which the network device receives the BWP handover latency type supported by the first terminal device and transmitted by the first terminal device.

Different BWP handover delay types correspond to different BWP handover delays, and in order to implement simultaneous BWP handover of the communicating terminal devices, the network device receives the BWP handover delay type supported by the first terminal device and reported by the first terminal device before the first terminal device performs handover, so as to determine a handover duration.

Optionally, the transceiver 1120 is further configured to execute step S404 in which the network device sends the first switching duration to the first terminal device.

The first switching duration is the maximum value of the switching delay corresponding to the BWP switching delay type supported by the first terminal device, so as to ensure that the terminal devices communicating with each other can complete BWP switching simultaneously. And the first terminal equipment does not send data within the time of the first switching duration after the switching is started until the first switching duration is finished.

Optionally, the transceiver 1120 is further configured to perform step S405 in which the network device sends the handover indication information to the first terminal device. Wherein the switching indication information is used for indicating the first terminal device to switch from the first BWP to the second BWP.

Optionally, the handover indication information is further used to indicate at least one of the following information: the moment when the handover starts; the time when the switching is completed, or the duration of performing BWP switching; a transmission resource on a second BWP.

Optionally, the transceiving unit 1120 is further configured to send a preconfigured switching condition to the first terminal device, where the preconfigured switching condition is a mapping relationship between the switching of the connection state of the first terminal device and BWP switching.

Optionally, in the present application, the configuration information of the first BWP and the configuration information of the second BWP may be from the same message, or from different messages, or from different parts in the same message. For example, the SIB or RRC message or the preconfiguration message may be sent to the terminal device, different SIB messages or different RRC messages or different or preconfiguration messages may be sent to the terminal device, or different fields or different parts of a message body in one SIB message or one RRC message or one preconfiguration message may be sent to the terminal device, which is not limited in this application.

Optionally, the transceiver 1120 is further configured to execute step S407 in which the network device sends the first indication information to the first terminal device.

Optionally, the transceiver 1120 is further configured to execute step S408 in which the network device receives the second indication information sent by the first terminal device.

Optionally, when BWPs of M first terminal devices are activated simultaneously, the transceiving unit 1120 is further configured to receive the following information sent by the first terminal device: whether simultaneous handover of the cellular link BWP and the sidelink BWP is supported; or supporting simultaneous switching of the total number of the cellular link BWPs and the sidelink BWPs; and/or the number of simultaneous handovers of the cellular link BWP and the number of BWPs supporting simultaneous handovers in the sidelink BWP under the condition that simultaneous handovers of the cellular link BWP and the sidelink BWP are supported; or a handover latency type supporting simultaneous handover of the cellular link BWP and a handover latency or a handover latency type of the sidelink BWP, on the condition that simultaneous handover of the cellular link BWP and the sidelink BWP is supported.

Processing unit 1110 performs the steps implemented or processed within the network device in the method embodiments.

Optionally, the processing unit 1110 is configured to determine configuration information of a bandwidth portion BWP corresponding to at least two connection states of the first terminal device, where the connection states are connection states between the terminal device and the network device, where the at least two connection states include an idle state, a connection state, or outside the network, and the at least two connection states respectively correspond to BWPs for sidelink.

Optionally, the processing unit 1110 is further configured to execute step S403, in which the network device determines a first switching duration according to the received BWP handover delay type supported by the first terminal device, where the first switching duration is the maximum value of the BWP handover delays corresponding to the BWP handover delay types supported by the pair of terminal devices or the group of terminal devices.

In some possible implementations, the communication apparatus 30 may be a network device to which the method 700 corresponds.

Optionally, the transceiver 1120 is configured to execute step S710 in which the network device sends the first handover indication information to the first terminal device.

The first handover indication information is used to indicate handover of currently active M BWPs, where M is a positive integer greater than 1.

It should be understood that the currently activated M BWP links may be the same or different, for example, the currently activated M BWP links may be M sidelinks, M cellular links, or M sidelinks and cellular links, which is not limited in this embodiment of the present invention.

Optionally, the processing unit 1110 is configured to execute the step of determining, by the network device, that the first terminal device determines the first handover indication information.

In some possible implementations, the communication apparatus 30 may be a network device corresponding to the method 800.

Optionally, the transceiver 1120 is configured to perform step S810 of the network device sending configuration information of the timer to the first terminal device.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a network device 40 suitable for the embodiment of the present application, and may be used to implement the functions of the network device in the communication method described above.

The network device 40 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 401 and one or more baseband units (BBUs). The baseband unit may also be referred to as a Digital Unit (DU) 402. The RRU 401 may be referred to as a transceiver unit, which corresponds to the transceiver unit 1120 in fig. 11. Optionally, the transceiver unit 401 may also be referred to as a transceiver, a transceiver circuit, a transceiver, or the like, and may include at least one antenna 4011 and a radio frequency unit 4012. Alternatively, the transceiver 1120 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver or receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter or transmitting circuit). The RRU 401 is mainly used for transceiving radio frequency signals and converting the radio frequency signals to baseband signals, for example, for sending configuration information to a first terminal device. The BBU 402 is mainly used for baseband processing, base station control, and the like. The RRU 401 and the BBU 402 may be physically disposed together or may be physically disposed separately, i.e., distributed base stations.

The BBU 402 is a control center of a network device, and may also be referred to as a processing unit, and may correspond to the processing unit 1110 in fig. 11, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulating, spreading, and the like. For example, the BBU (processing unit) 402 can be used to control the network device 40 to execute the operation procedures related to the network device in the above-described method embodiments, such as determining the first switching duration, etc.

In an example, the BBU 402 may be formed by one or more boards, and the multiple boards may collectively support a radio access network of a single access system (e.g., an LTE system or a 5G system), or may respectively support radio access networks of different access systems. The BBU 402 also includes a memory 4021 and a processor 4022. The memory 4021 stores necessary instructions and data. For example, the memory 4021 stores the codebook and the like in the above-described embodiments. The processor 4022 is configured to control the base station to perform necessary actions, for example, to control the network device to perform the operation procedure related to the network device in the above method embodiment. The memory 4021 and the processor 4022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the network device 40 shown in fig. 11 is capable of implementing the network device functions involved in the method embodiments of fig. 4, 7 and 8. The operations and/or functions of the units in the network device 40 are respectively for implementing the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, detailed description is appropriately omitted herein. The structure of the network device illustrated in fig. 11 is only one possible form, and should not limit the embodiments of the present application in any way. This application does not exclude the possibility of other forms of network device architecture that may appear in the future.

The embodiment of the present application further provides a communication system, which includes the foregoing network device and one or more terminal devices.

The present application also provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps performed by the first terminal device in the methods shown in fig. 4, fig. 7 and fig. 8.

The present application further provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps performed by the network device in the methods shown in fig. 4, fig. 7, and fig. 8.

The present application also provides a computer program product comprising instructions for causing a computer to perform the steps performed by the first terminal device in the methods shown in fig. 4, 7 and 8, when the computer program product runs on the computer.

The present application also provides a computer program product containing instructions for causing a computer to perform the steps performed by the network device in the methods shown in fig. 4, fig. 7 and fig. 8 when the computer program product runs on the computer.

The application also provides a chip comprising a processor. The processor is configured to read and execute the computer program stored in the memory to perform corresponding operations and/or procedures performed by the first terminal device in the communication method provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

The application also provides a chip comprising a processor. The processor is configured to call and execute the computer program stored in the memory to perform corresponding operations and/or procedures performed by the network device in the communication method provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

In the above embodiments, the processor may be a Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the present disclosure. For example, the processor may be a digital signal processor device, a microprocessor device, an analog-to-digital converter, a digital-to-analog converter, or the like. The processor may distribute the functions of control and signal processing of the terminal device or the network device among these devices according to their respective functions. Further, the processor may have the functionality to operate one or more software programs, which may be stored in the memory. The functions of the processor may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

The memory may be a read-only memory (ROM), other types of static storage devices that may store static information and instructions, a Random Access Memory (RAM), or other types of dynamic storage devices that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, etc.

Alternatively, the memory and the storage involved in the above embodiments may be physically separate units, or the memory and the processor may be integrated together.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c or a-b-c, wherein a, b and c can be single or multiple.

Those of ordinary skill in the art will appreciate that the various elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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.

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.

In the several embodiments provided in the present application, the disclosed system, apparatus and method can be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the unit is only one logical function division, and there may be other division ways in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. 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 not be physically separate, and parts displayed as units may not be physical units, that is, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the technical solution of the present application.

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.

This functionality, 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 solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several 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: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all of them should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

a first terminal device obtains configuration information of a bandwidth part BWP corresponding to at least two connection states respectively, wherein the connection states are connection states between the first terminal device and a network device, the at least two connection states comprise an idle state, a connection state or an off-network state, and the BWP corresponding to the at least two connection states respectively is used for a sidelink;

the first terminal device sends the BWP handover delay type supported by the first terminal device to the network device, where different handover delay types of the BWP supported by the first terminal device correspond to different BWP handover delays;

the first terminal device obtains a first switching duration, wherein the first switching duration is the maximum value of the BWP switching delays corresponding to the BWP switching delay types supported by the first terminal device;

the first terminal device switches from a first BWP to a second BWP according to configuration information of the first BWP and configuration information of the second BWP in the configuration information, and the first terminal device does not send data within the time of the first switching duration after the switching is started;

wherein the first BWP and the second BWP belong to BWPs to which the at least two connection states respectively correspond.

2. The method according to claim 1, wherein the BWP respectively corresponding to the at least two connection states comprises:

a BWP corresponding to an idle state; and/or

At least one BWP corresponding outside the network, and/or

At least one BWP corresponding to the connected state.

3. The method according to claim 1 or 2, wherein prior to said switching from the first BWP to the second BWP, the method further comprises:

the first terminal device receives switching indication information from a network device or a second terminal device, wherein the switching indication information is used for indicating the first terminal device to switch from the first BWP to the second BWP;

the switching from the first BWP to the second BWP comprises:

the first terminal device switches from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information, and the switch indication information.

4. The method of claim 3, wherein the handover indication information is further used for indicating at least one of the following information:

the moment when the handover starts;

the time when the switching is completed, or the duration of performing BWP switching;

a transmission resource on the second BWP.

5. The method according to claim 1 or 2, wherein the first terminal device switches from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information, comprising:

the first terminal device switches from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information and a preconfigured switching condition;

the preconfigured switching condition is a corresponding relation between switching of the connection state of the first terminal device and BWP switching.

6. The method according to any of claims 1 to 5, wherein the configuration information comprises time-frequency resources of BWPs for which the at least two connection states correspond, wherein,

the time-frequency resource of at least one BWP corresponding to the connected state is a subset of the time-frequency resource of the BWP corresponding to the idle state; and/or the presence of a gas in the gas,

the time-frequency resource of at least one BWP corresponding to the outside of the network is a subset of the time-frequency resource of the BWP corresponding to the idle state; and/or the presence of a gas in the gas,

the time-frequency resource of at least one BWP corresponding to the connected state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network; and/or the presence of a gas in the gas,

the time-frequency resource of the BWP corresponding to the idle state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network.

7. A method of communication, comprising:

the method comprises the steps that a network device determines configuration information of bandwidth part BWP (broadband remote procedure) corresponding to at least two connection states of a first terminal device, wherein the connection states are connection states between the first terminal device and the network device, the at least two connection states comprise an idle state, a connection state or an off-network state, and the BWP corresponding to the at least two connection states are used for a sidelink;

the network equipment sends the configuration information to the first terminal equipment;

the network device receives a BWP handover delay type supported by the first terminal device sent by the first terminal device, where different handover delay types of the BWP supported by the first terminal device correspond to different BWP handover delays;

the network device determines a first switching duration according to the BWP switching delay type supported by the first terminal device, where the first switching duration is a maximum value of BWP switching delays corresponding to the BWP switching delay type supported by the first terminal device;

and the network equipment sends the first switching duration to the first terminal equipment.

8. The method according to claim 7, wherein the BWPs corresponding to the at least two connection states respectively comprise:

a BWP corresponding to an idle state; and/or

At least one BWP corresponding outside the network, and/or

At least one BWP corresponding to the connected state.

9. The method according to claim 7 or 8, characterized in that the method further comprises:

when the first terminal device is in a connected state, the network device sends switching indication information to the first terminal device, wherein the switching indication information is used for indicating the first terminal device to switch from a first BWP to a second BWP.

10. The method of claim 9, wherein the handover indication information is further used for indicating at least one of the following information:

the moment when the handover starts;

the time when the switching is completed, or the length of time for performing BWP switching;

a transmission resource on the second BWP.

11. The method according to claim 7 or 8, characterized in that the method further comprises:

the network device sends a preconfigured switching condition to the first terminal device, where the preconfigured switching condition is a corresponding relationship between connection state switching and BWP switching of the first terminal device.

12. The method according to any of claims 7 to 11, wherein the configuration information comprises time-frequency resources of BWPs corresponding to the at least two connection states, wherein,

the time-frequency resource of at least one BWP corresponding to the connected state is a subset of the time-frequency resource of at least one BWP corresponding to the outside of the network; and/or the presence of a gas in the atmosphere,

13. A first communications device, comprising:

a transceiving unit, configured to obtain configuration information of a bandwidth portion BWP corresponding to at least two connection states, where the connection states are connection states between the first communication device and a network device, and the at least two connection states include an idle state, a connection state, or an off-network state, and the BWPs corresponding to the at least two connection states are used for a sidelink;

the transceiving unit is further configured to send, to the network device, the BWP handover latency type supported by the first communication device, where different handover latency types of the BWP supported by the first communication device correspond to different BWP handover latencies;

the transceiver unit is further configured to acquire a first handover duration, where the first handover duration is a maximum value of BWP handover delays corresponding to BWP handover delay types supported by the first communications device;

a processing unit, configured to switch from a first BWP to a second BWP according to configuration information of the first BWP and configuration information of the second BWP in the configuration information, and not send data within a time of the first switching duration after the start of switching;

14. The apparatus according to claim 13, wherein the BWPs corresponding to the at least two connection states respectively comprise:

a BWP corresponding to an idle state; and/or

At least one BWP corresponding outside the network, and/or

At least one BWP corresponding to the connected state.

15. The apparatus according to claim 13 or 14, wherein the transceiver unit is further configured to:

receiving switching indication information from a network device or a second communication apparatus, wherein the switching indication information is used for indicating that the first communication apparatus is switched from the first BWP to the second BWP;

the processing unit is further configured to switch from the first BWP to the second BWP according to the configuration information of the first BWP and the configuration information of the second BWP in the configuration information, and the switch indication information.

16. The apparatus of claim 15, wherein the handover indication information is further used for indicating at least one of the following information:

the moment when the handover starts;

a transmission resource on the second BWP.

17. The apparatus according to claim 13 or 14, wherein the processing unit is further configured to:

switching from the first BWP to the second BWP according to configuration information of the first BWP and configuration information of the second BWP in the configuration information and a preconfigured switching condition;

the preconfigured handover condition is a correspondence of a handover of a connection state of the first communication device to a BWP handover.

18. The apparatus according to any of claims 13 to 17, wherein the configuration information comprises time-frequency resources of BWPs corresponding to the at least two connection states, wherein,

19. A network communication apparatus, comprising:

a processing unit, configured to determine configuration information of a bandwidth portion BWP corresponding to at least two connection states of a first terminal device, where the connection states are connection states between the first terminal device and the network communication apparatus, the at least two connection states include an idle state, a connection state, or an out-of-network state, and the BWPs corresponding to the at least two connection states are used for a sidelink;

a receiving and sending unit, configured to send the configuration information to the first terminal device;

the transceiver unit is further configured to receive a BWP handover delay type supported by the first terminal device sent by the first terminal device, where different handover delay types of the BWP supported by the first terminal device correspond to different BWP handover delays;

the processing unit is further configured to determine a first switching duration according to the BWP switching latency type supported by the first terminal device, where the first switching duration is a maximum value of BWP switching latencies corresponding to the BWP switching latency type supported by the first terminal device;

the transceiver unit is further configured to send the first switching duration to the first terminal device.

20. The apparatus according to claim 19, wherein the BWPs corresponding to the at least two connection states respectively comprise:

a BWP corresponding to an idle state; and/or

At least one BWP corresponding outside the network, and/or

At least one BWP corresponding to the connected state.

21. The apparatus according to claim 19 or 20, wherein when the first terminal device is in the connected state, the transceiver unit is further configured to:

and sending switching indication information to the first terminal device, wherein the switching indication information is used for indicating the first terminal device to switch from a first BWP to a second BWP.

22. The apparatus of claim 21, wherein the handover indication information is further used for indicating at least one of the following information:

the moment when the handover starts;

a transmission resource on the second BWP.

23. The apparatus according to claim 19 or 20, wherein the transceiver unit is further configured to:

sending a preconfigured switching condition to the first terminal device, where the preconfigured switching condition is a corresponding relationship between switching of a connection state of the first terminal device and BWP switching.

24. The apparatus according to any of claims 19-23, wherein the configuration information comprises time-frequency resources of BWPs for which the at least two connection states correspond, wherein,

25. A communication device, comprising:

a memory for storing a computer program;

a processor for executing a computer program stored in the memory to cause the apparatus to perform the communication method of any one of claims 1 to 12.

26. A computer-readable storage medium comprising a computer program which, when run on a computer, causes the computer to perform the communication method of any one of claims 1 to 12.