CN115915303A - Switching method and switching device for bandwidth part - Google Patents

Abstract

The application provides a switching method and a switching device for BWP, the method is applied to a terminal device configured with a first BWP and a second BWP, the configuration of the first BWP and the second BWP is the same, and the center frequency of the first BWP and the second BWP is different, the method comprises the following steps: the terminal device receives first information from the network device on a first BWP, the first information being used to activate or deactivate the target semi-persistent activity in the first BWP, the first BWP being an active BWP. And the terminal equipment is switched to the second BWP from the first BWP, and the second BWP is the active BWP after the switching. And the terminal equipment determines the state of the target semi-persistent activity in the second BWP after the BWP switching according to the first information, wherein the state comprises an activated state and a deactivated state.

Description

Switching method and switching device for bandwidth part

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for switching a bandwidth part (BWP).

Background

Semi-persistent activity (SP-activity) may also be referred to as semi-persistent behavior (semi-persistent behavior) and, more generally, semi-persistent configuration (semi-persistent configuration). Semi-persistent activity requires signaling for activation (activation) or deactivation (deactivation). The signaling for activating/deactivating the semi-persistent activity may be Downlink Control Information (DCI) or a medium access control control element (MAC CE). Semi-persistent activities include semi-persistent resources that occur periodically after activation of the semi-persistent resources and semi-persistent states that are active until after activation of the semi-persistent states. The effective range of the semi-persistent activity is within one BWP, for example, when the MAC CE activates the semi-persistent resource, the MAC CE may indicate the identity of the BWP where the semi-persistent resource is located, and the BWP corresponding to the identity of the BWP is the BWP to which the MAC CE is applicable, that is, the BWP in which the MAC CE is effective.

The BWP is a subset bandwidth of the total bandwidth of a cell, and a terminal device may be configured with multiple BWPs in a cell, for example, 4 or 5 downlink BWPs, 4 or 5 uplink BWPs. At the same time, only one downlink BWP and one uplink BWP are active in the same cell, which is called active BWP (active BWP). In general, a terminal device transceives data on an active BWP, and the terminal device may switch from one BWP to another BWP through a BWP switch (BWP switch).

For DCI-activated semi-persistent activity, after the terminal device is switched from the first BWP to the second BWP, the semi-persistent activity in the first BWP is deactivated or cleared (cleared), and for MAC CE-activated semi-persistent activity, the semi-persistent activity in the first BWP is typically suspended (suspended). If the terminal device wants to continue transmitting the semi-persistent activity after switching to the second BWP, or wants the semi-persistent activity to be in the active state, a new activation signaling is needed to activate the semi-persistent activity in the second BWP, which increases signaling overhead and reduces resource utilization.

Disclosure of Invention

The embodiments of the present application provide a BWP switching method and a BWP switching apparatus, which are beneficial to reducing signaling overhead and improving resource utilization.

In a first aspect, a BWP handover method is provided, which is applied to a terminal device configured with a first BWP and a second BWP, where the first BWP and the second BWP have the same configuration and the first BWP and the second BWP have different center frequencies, and the method includes: the terminal device receives first information from the network device on a first BWP, the first information being used to activate or deactivate the target semi-persistent activity in the first BWP, the first BWP being an active BWP. And the terminal equipment is switched to the second BWP from the first BWP, and the second BWP is the active BWP after the switching. And the terminal equipment determines the state of the target semi-persistent activity in the second BWP after switching the BWP according to the first information, wherein the state comprises an activated state and a deactivated state.

In this application, the first information may be used to activate or deactivate the target semi-persistent activity in the first BWP, and after the terminal device switches from the first BWP to the second BWP, the first information may also be used to activate or deactivate the target semi-persistent activity in the second BWP, that is, the first information is still valid in the second BWP, so that the state of the target semi-persistent activity in the first BWP after the BWP switch may be continued to the second BWP without the network device re-sending an activation/deactivation signaling to indicate the state of the target semi-persistent activity in the second BWP, which is beneficial to reduce signaling overhead and improve resource utilization.

With reference to the first aspect, in certain implementations of the first aspect, the identifiers of the first BWP and the second BWP are different, and the configurations are the same, that is, radio Resource Control (RRC) configurations other than the center frequency and the identifier of the BWP are the same.

In the present application, since a terminal device may configure multiple BWPs, the BWPs are identified differently to distinguish different BWPs, and the center frequency of the BWPs can be determined by the start frequency and bandwidth of the BWPs configured by the network device, and the start frequency of different BWPs is different, so the center frequency of the BWPs is also different. Other RRC configurations are the same, which is beneficial to reduce BWP handover delay and improve data transmission rate of the terminal device.

With reference to the first aspect, in certain implementations of the first aspect, the first BWP and the second BWP belong to the same BWP group, or the first BWP and the second BWP share the same common configuration parameters.

With reference to the first aspect, in certain implementations of the first aspect, the terminal device receives configuration information from the network device, where the configuration information is used to configure that the first BWP and the second BWP belong to the same BWP group, or configure common parameters of the first BWP and the second BWP. The terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP switching according to the first information, and comprises the following steps: the terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handoff according to the first information and the configuration information.

In this application, the configuration information is used to configure the first BWP and the second BWP to belong to the same BWP group, wherein the parameters of the BWPs in the same BWP group may be separately configured, but other RRC configurations except for the difference in the identification and center frequency of the BWPs may be the same. In such a way, the process of comparing the parameters of the first BWP and the second BWP by the terminal device can be omitted, and the calculation amount of the terminal device can be saved. The terminal device may further receive a common configuration parameter sent by the network device, where the common configuration parameter is shared by the first BWP and the second BWP, and only a small number of parameters are configured separately, such as an identifier of the BWP and a center frequency of the BWP. In this way, the network device only needs to send the common configuration information once, and only needs to configure a small number of parameters for the first BWP and the second BWP separately, which is beneficial to saving signaling overhead.

With reference to the first aspect, in certain implementations of the first aspect, the first information is used to activate the target semi-persistent activity in the first BWP, and the determining, by the terminal device, a state of the target semi-persistent activity in the first BWP after the BWP handover according to the first information and the configuration information includes: and the terminal equipment determines the state of the target semi-persistent activity in the second BWP after the BWP switching to be an active state according to the first information and the configuration information.

In the present application, if the first information is used to activate the target semi-persistent activity in the first BWP and the terminal device receives the configuration information, the terminal device does not need new signaling to activate the target semi-persistent activity in the second BWP after the BWP handover, and continues to maintain the active state of the target semi-persistent activity in the first BWP, which is beneficial to saving signaling overhead.

With reference to the first aspect, in certain implementations of the first aspect, the first information is used to deactivate the target semi-persistent activity in the first BWP, and the determining, by the terminal device, the state of the target semi-persistent activity in the first BWP after the BWP handover according to the first information and the configuration information includes: and the terminal equipment determines that the state of the target semi-continuous activity in the second BWP after the BWP switching is a deactivated state according to the first information and the configuration information.

In the present application, if the first information is used to deactivate the target semi-persistent activity in the first BWP and the terminal device receives the configuration information, the terminal device does not need new signaling to deactivate the target semi-persistent activity in the second BWP after the BWP handover, and continues to maintain the deactivated state of the target semi-persistent activity in the first BWP, which is beneficial to saving signaling overhead.

With reference to the first aspect, in certain implementations of the first aspect, the terminal device receives second information from the network device, where the second information is used to indicate whether the first information is effective for a second BWP after the terminal device switches from the first BWP to the second BWP. The terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handover according to the first information, including: the terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handoff according to the first information and the second information.

In this application, the terminal device may determine, through the second information, whether the first information is effective for the second BWP after switching from the first BWP to the second BWP, that is, whether a state of the target semi-persistent activity in the first BWP continues into the second BWP. When the active state of the semi-persistent activity extends into the second BWP, the active state may collide with other resources in the second BWP, for example, there may be other terminal devices transmitting data in the second BWP, such as PUSCH/PUCCH/SRS, or there may be network devices transmitting data, such as PDSCH/PDCCH/CSI-RS/TRS, so when there may be other terminal devices transmitting data using the semi-persistent resources in the second BWP, the application may indicate, through the second information, that the first information is not effective for the second BWP, which is beneficial to avoiding the problem that the semi-persistent resources after BWP handover may collide with resources in the second BWP.

With reference to the first aspect, in some implementations of the first aspect, the second information is carried by RRC signaling or downlink control information, DCI.

With reference to the first aspect, in certain implementations of the first aspect, the first information is used to activate the target semi-persistent activity in the first BWP, and the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. The terminal device determines the state of the target semi-persistent activity in the second BWP after switching the BWP according to the first information and the second information, and the method comprises the following steps: and the terminal equipment determines the state of the target semi-persistent activity in the second BWP after the BWP switching to be the activated state according to the first information and the second information.

In this application, if the first information is activation signaling and the second information indicates that the first information is valid for the second BWP, the active state of the target semi-persistent activity in the first BWP is continued into the second BWP, i.e. the target semi-persistent activity is also in the active state in the second BWP.

With reference to the first aspect, in certain implementations of the first aspect, the first information is used to deactivate the target semi-persistent activity in the first BWP, and the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. The terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handover according to the first information and the second information, and the method comprises the following steps: and the terminal equipment determines the state of the target semi-continuous activity in the second BWP after the BWP switching as the deactivation state according to the first information and the second information.

In this application, if the first information is deactivation signaling and the second information indicates that the first information is effective for the second BWP, the deactivated state of the target semi-persistent activity in the first BWP is continued into the second BWP, i.e. the target semi-persistent activity is also in the deactivated state in the second BWP.

With reference to the first aspect, in some implementations of the first aspect, the second information is carried by RRC signaling, and the second information is used to indicate that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. After the terminal device receives the second information from the network device, the terminal device receives third information from the network device, the third information indicating that the first information is not effective for the second BWP after the terminal device switches from the first BWP to the second BWP, and the third information being carried by the DCI.

In this application, if the second information is carried by RRC signaling and the second information indicates that the first information is effective for the second BWP after the BWP handover, the configuration period of the RRC signaling is long, for example, once every hour. Because the active state of the semi-persistent activity may collide with other resources in the second BWP when the active state of the semi-persistent activity is continued into the second BWP, in order to avoid resource collision, after the terminal device receives the second information, the terminal device may further send third information, where the third information is carried by DCI, and the DCI is a real-time dynamic instruction, which may flexibly cancel the second information, that is, indicate that the first information is not valid for the second BWP after the BWP handover, and is beneficial to avoiding the problem of resource collision.

With reference to the first aspect, in certain implementations of the first aspect, the first information is carried by DCI.

With reference to the first aspect, in certain implementations of the first aspect, the target semi-persistent activity includes semi-persistent resources including at least one of: a Physical Downlink Shared Channel (PDSCH) resource of a downlink semi-persistent scheduling (DL SPS), a type2 physical uplink shared channel (uplink configured grant type 2) resource of an uplink configuration grant, and a PUSCH (SP CSI reporting PUSCH) resource for reporting semi-persistent channel state information.

With reference to the first aspect, in certain implementations of the first aspect, the first information is carried by the MAC CE.

With reference to the first aspect, in certain implementations of the first aspect, the target semi-persistent activity includes semi-persistent resources and/or a semi-persistent state, the semi-persistent state includes a Physical Uplink Control Channel (PUCCH) spatial relationship and/or a Transmission Configuration Indication (TCI) state of the terminal device dedicated PDSCH, and the semi-persistent resources include at least one of: a semi-persistent channel state information reference signal (CSI-RS) resource, a semi-persistent channel state information interference measurement (CSI-IM) resource, a semi-persistent zero-power CSI-RS resource set (SP ZP CSI-RS resource set), a semi-persistent sounding reference signal (SP SRS) resource, or a PUCCH resource for semi-persistent CSI reporting (SP CSI reporting PUCCH).

With reference to the first aspect, in certain implementations of the first aspect, the MAC CE includes an identification of the first BWP and an identification of the second BWP.

In this application, the format of the MAC CE may be extended such that the MAC CE carries the identifiers of the multiple BWPs, so that when the semi-persistent activity is activated/deactivated by the MAC CE, the terminal device may switch from the first BWP to the second BWP through the identifiers of the multiple BWPs carried by the MAC CE, and the MAC CE may indicate that the first information is still applicable to the second BWP after the switch, which is also beneficial to reducing the signaling overhead.

With reference to the first aspect, in certain implementations of the first aspect, the first information is used to activate the target semi-persistent activity in the first BWP, and the terminal device temporarily suspends the target semi-persistent activity within the first BWP after the terminal device switches from the first BWP to the second BWP.

In the present application, whether the target semi-persistent activity in the first BWP is activated through DCI or MAC CE, the target semi-persistent activity activated in the first BWP is temporarily suspended after BWP handover, so that the target semi-persistent activity in the first BWP can be quickly recovered to be active after the second BWP is handed over to the first BWP again, and no new activation signaling is required to reactivate, which is beneficial to reduce signaling overhead and data transmission delay on the BWP.

With reference to the first aspect, in certain implementations of the first aspect, the terminal device receives fourth information from the network device before the terminal device switches from the first BWP to the second BWP, the fourth information being used to instruct the terminal device to switch from the first BWP to the second BWP. The method for switching the terminal device from the first BWP to the second BWP comprises the following steps: the terminal device switches from the first BWP to the second BWP according to the fourth information.

In this application, the terminal device may perform BWP handover according to the fourth information, which may be carried by DCI, for example.

In a second aspect, a BWP handover method is provided, including: the network device sends configuration information to the terminal device, wherein the configuration information is used for configuring that the first BWP and the second BWP belong to the same BWP group or configuring common parameters of the first BWP and the second BWP.

With reference to the second aspect, in certain implementations of the first aspect, the network device sends, to the terminal device, second information indicating whether the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP.

With reference to the second aspect, in some implementations of the first aspect, the network device sends, to the terminal device, third information indicating that the first information is not effective for the second BWP after the terminal device switches from the first BWP to the second BWP, where the third information is carried by DCI.

In a third aspect, a switching device for BWP is provided, comprising: for performing the method of any one of the possible implementations of the first aspect described above. In particular, the apparatus comprises means for performing the method of any one of the possible implementations of the first aspect described above.

In a fourth aspect, there is provided another switching apparatus for BWP, comprising a processor coupled to a memory and configured to execute instructions in the memory to implement the method of any one of the above possible implementations. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the switching device of the BWP is a terminal device. When the switching device of the BWP is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the switching device of the BWP is a chip configured in the terminal device. When the switching device of the BWP is a chip configured in the terminal device, the communication interface may be an input/output interface.

In a fifth aspect, a processor is provided, which includes: input circuit, output circuit and processing circuit. The processing circuit is configured to receive a signal via the input circuit and transmit a signal via the output circuit, so that the processor performs the method of any one of the possible implementations of the first aspect.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.

In a sixth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory, and may receive signals via the receiver and transmit signals via the transmitter to perform the method of any one of the possible implementations of the first aspect.

Optionally, there are one or more processors and one or more memories.

Alternatively, the memory may be integrated with the processor, or provided separately from the processor.

In a specific implementation process, the memory may be a non-transitory (non-transitory) memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips, and the embodiment of the present application does not limit the type of the memory and the arrangement manner of the memory and the processor.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, the data output by the processing may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing device in the above sixth aspect may be a chip, the processor may be implemented by hardware or may be implemented by software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program (also called code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first aspect described above.

In an eighth aspect, a computer-readable storage medium is provided, which stores a computer program (which may also be referred to as code or instructions) that, when executed on a computer, causes the computer to perform the method of any one of the possible implementations of the first aspect.

Drawings

FIG. 1 is a schematic diagram of a communication system;

fig. 2 is a schematic diagram of a DCI scheduled PDSCH with DL SPS enabled;

FIG. 3 is a schematic diagram of a format of a MAC CE activating/deactivating a semi-persistent CSI-RS/CSI-IM resource set;

FIG. 4 is a schematic diagram of a MAC CE activating semi-persistent resources;

FIG. 5 is a schematic diagram of a semi-persistent resource after BWP handoff;

fig. 6 is a flowchart illustrating a BWP handover method according to an embodiment of the present application;

fig. 7 is a schematic diagram of a semi-persistent resource after BWP handover according to an embodiment of the present application;

fig. 8 is a flowchart illustrating another BWP handover method according to an embodiment of the present application;

fig. 9 is a flowchart illustrating a BWP handover method according to an embodiment of the present application;

fig. 10 is a flowchart illustrating a BWP handover method according to an embodiment of the present application;

fig. 11 is a schematic diagram of a DCI activated DL SPS according to an embodiment of the present application;

fig. 12 is a schematic block diagram of a BWP switching device provided in an embodiment of the present application;

fig. 13 is a schematic block diagram of another BWP switching device provided in an embodiment of the present application.

Detailed Description

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

Before describing the BWP switching method and switching device provided in the embodiments of the present application, the following description is made.

First, in the embodiments shown below, terms and english abbreviations such as BWP handover, activation signaling, deactivation signaling, RRC signaling, etc. are exemplary examples given for convenience of description, and should not limit the present application in any way. This application is not intended to exclude the possibility that other terms may be defined in existing or future protocols to carry out the same or similar functions.

Second, the first, second and various numerical numbers in the embodiments shown below are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. E.g. to distinguish between different BWPs, to distinguish between different information, etc.

Third, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: 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" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, and c, may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, wherein a, b and c can be single or multiple.

Fig. 1 is a schematic diagram of a communication system 100. As shown in fig. 1, the communication system 100 may include a network device 110 and at least one terminal device 120. Fig. 1 exemplarily shows a scenario of 2 terminal devices. Optionally, the communication system further comprises a core network device 130. The terminal device 120 is connected to the network device 110 in a wireless manner, and the network device 110 is connected to the core network device 130 in a wireless or wired manner.

In the embodiment of the present application, the terminal device may be fixed in position or may be movable. The number of network devices and terminal devices included in the communication system is not limited in the embodiments of the present application. The core network device and the network device may be separate physical devices, or the function of the core network device and the logic function of the network device may be integrated on the same physical device, or a physical device may be integrated with a part of the function of the core network device and a part of the function of the network device.

Terminal equipment in embodiments of the present application may refer to user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a Mixed Reality (MR) terminal, an extended reality (XR) terminal, a holographic display terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), or other processing devices connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolution network, for example, a reduced capability (reduced capability, reset) terminal device in a New Radio (NR) system.

In addition, the terminal device may also be a terminal device in an internet of things (IoT) system. The IoT is an important component of future information technology development, and is mainly technically characterized in that articles are connected with a network through a communication technology, so that an intelligent network with man-machine interconnection and object interconnection is realized. The specific form of the terminal device is not limited in the present application.

It should be understood that in the embodiment of the present application, the terminal device may be an apparatus for implementing a function of the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, such as a chip system, and the apparatus may be installed in the terminal. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.

The network device in the embodiment of the present application may be any device having a wireless transceiving function. The apparatus includes, but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved NodeB or home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP), a wireless relay Node, a wireless backhaul Node, a Transmission Point (TP) or a Transmission and Reception Point (TRP) in a wireless fidelity (WIFI) system, and the like, and may also be 5G, such as a gbb or a transmission point (TRP or TP) in an NR system, and one or a group of base stations in a 5G system may include multiple antennas, or panels, and may also be configured as a network panel or a distributed Node B (NB), and the like.

It should be understood that in the embodiment of the present application, the network device may be an apparatus for implementing a function of the network device, and may also be an apparatus capable of supporting the network device to implement the function, for example, a system on chip, and the apparatus may be installed in the network device.

It should also be understood that the network device and the terminal device in the embodiments of the present application may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; or deployed on the surface; or on aerial airplanes, balloons, and satellites. The embodiment of the application does not limit the application scenarios of the network device and the terminal device.

It should be noted that, the communication system to which the embodiment of the present application is applied includes, but is not limited to: fifth generation (5 th generation,5 g) systems or future evolution communication systems, such as NR communication systems, vehicle-to-other devices (vehicle-to-X V X), wherein V2X may include vehicle-to-Internet (V2N), vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), etc., long term evolution (LTE-V) for vehicle-to-vehicle, vehicle networking, machine Type Communication (MTC), internet of things (IoT), long term evolution (LTE-to-machine), machine-to-machine (M) for machine communication, LTE-M, M2M, WLAN-to-device (WLAN-to-M), wireless network (LTE-to-M, etc.), wireless devices (WLAN-to-network, LTE-to-network, etc.

For ease of understanding, the following briefly introduces terms referred to in the embodiments of the present application.

1、BWP

The BWP is a subset bandwidth of the total bandwidth of a cell, and the BWP is divided into an uplink BWP and a downlink BWP, and a terminal device may be configured with multiple BWPs in a cell, for example, 4 or 5 downlink BWPs, and 4 or 5 uplink BWPs, and at the same time, only 1 downlink BWP and only one uplink BWP are active in the same cell, which is called active BWP (active BWP). In general, a terminal device can only transceive data on an active BWP.

The parameters of different BWPs are independent of each other, and the parameters of different BWPs may be configured to be the same or different. Taking three parameters, i.e., the center frequency, the bandwidth size, and the subcarrier spacing (SCS), as an example, the three parameters may affect a Radio Frequency (RF) parameter of the terminal device, that is, if the three parameters are different, the terminal device may need to adjust a radio frequency link, thereby causing an interruption of the terminal device, and the terminal device cannot transmit and receive data during the interruption. In addition, RRC parameters between different BWPs are also configured independently of each other.

In the case where the terminal device is configured with a plurality of BWPs, the terminal device may switch from one BWP to another BWP through a BWP switch (BWP switch). For example, switching from BWP with smaller bandwidth to BWP with larger bandwidth is beneficial to improving the data rate of the terminal device and reducing the time delay; switching from the BWP with larger bandwidth to the BWP with smaller bandwidth is beneficial to saving power consumption of the terminal device.

2. Triggering mode for BWP switching

BWP handover may have the following 3 triggering methods:

(1) Triggering DCI: the DCI includes a BWP indication (indicator) information field, where the information field is used to indicate an Identity (ID) of a target BWP, and if the indicated ID of the target BWP is different from the currently located (or currently activated) BWP ID of the terminal device, the DCI indicates that the terminal device triggers the terminal device to switch the BWP to the BWP corresponding to the BWP ID indicated in the BWP indication information field.

(2) Triggering a timer: if the terminal device expires the deactivation timer (BWP-inactivity timer) of the BWP where the terminal device is currently located, the terminal device is triggered to switch the BWP to a default BWP, which may be the initial BWP that the terminal device initially accesses.

(3) RRC signaling triggering: if the terminal device receives an RRC reconfiguration (RRC reconfiguration) signaling, which includes a signaling indicating that the terminal device performs BWP handover, or if a parameter of the currently activated BWP changes, it indicates that the RRC reconfiguration signaling triggers the terminal device to perform BWP handover.

3. BWP handoff latency

The NR communication system supports two types of BWP handover delay (BWP switch delay), and which type is specifically adopted by the terminal device may be determined according to the capability reported by the terminal device. For example, if the terminal device reports the capability support type 1 (type 1), the terminal device supports the BWP handover latency of type 1, and if the terminal device reports the capability support type2 (type 2), the terminal device supports the BWP handover latency of type 2. BWP handoff delay is related to subcarrier spacing, as shown in table one.

Watch 1

Wherein, if the BWP switching involves a change of the SCS, the BWP switching time delay is equal to the smaller BWP switching time delay corresponding to the SCS before and after BWP switching. μ denotes a digital basic configuration (numerology), and different μ respectively correspond to different subcarrier spacings. As can be seen from table one, when μ is 0,1,2, and 3, BWP switching latencies of type 1 are 1slot, 2slot, 3slot, and 6slot, respectively, and corresponding absolute times are 1ms, 0.75ms, and 0.75ms, respectively. When mu is 0,1,2, 3, BWP switching delay of type2 is 3 slots, 5 slots, 9 slots, 18 slots, respectively, and corresponding absolute time is 3ms, 2.5ms, 2.25ms, respectively.

The BWP handover latency may consist of multiple parts, e.g. for DCI triggered BWP handover, the BWP handover latency mainly includes DCI resolution time, radio frequency and baseband (baseband) parameter calculation and loading time, and radio frequency switching/tuning (RF tuning) time. In addition, the BWP handover delay also includes a certain redundancy, which is used to ensure that the BWP handover delay end time is aligned with the slot boundary.

4. Semi-continuous activity

Semi-persistent (SP) is also known as semi-persistent. Semi-persistent activities may also be referred to as semi-persistent behaviors (semi-persistent behavior). In a broader sense, semi-persistent activity may also be referred to as semi-persistent configuration (semi-persistent configuration).

Semi-persistent activity requires signaling for activation (activation) or deactivation (deactivation). Semi-persistent activities can be divided into two categories, depending on the activation/deactivation signaling: 1) The activation/deactivation signaling is DCI; 2) The activation/deactivation signaling is MAC CE.

Semi-persistent activity is relative to periodic (periodic) activity and aperiodic (aperiodic) activity. The periodic activity does not need signaling activation after RRC configuration, when a BWP is an active BWP, the periodic activity in the BWP is in an active state, and if the network device releases the periodic activity through RRC configuration, the corresponding periodic activity is stopped. Aperiodic activity generally requires DCI triggering and is a one-time activity, and after the DCI-triggered aperiodic activity ends, a new DCI is also required to trigger a new aperiodic activity. For example, when DCI triggers a non-periodic Reference Signal (RS) resource, DCI activates only one reference signal resource; when the DCI triggers aperiodic channel state information reporting (CSI reporting), the DCI activates only one Physical Uplink Shared Channel (PUSCH) resource to be reported. And the semi-persistent activity is periodically appeared or is always effective after the activation of the activation signaling, and the semi-persistent activity is stopped after the deactivation of the deactivation signaling.

Semi-persistent activities include semi-persistent resources and semi-persistent states. For semi-persistent resources, the semi-persistent resources occur periodically after activation of the signaling. For the semi-persistent state, the semi-persistent state is active after activation signaling is activated.

Illustratively, activating/deactivating a Physical Downlink Control Channel (PDCCH) of downlink semi-persistent scheduling (DL SPS) satisfies: a Cyclic Redundancy Check (CRC) of DCI carried on the PDCCH is scrambled by a configured scheduling radio network temporary identifier (CS-RNTI), and a new data indicator field (NDI field) corresponding to an enabled transport block (enabled TB) is set to "0".

Illustratively, if the information field in the DCI scrambled by the CS-RNTI satisfies the condition of table two below, it may be determined that the DCI is a DCI activating DL SPS. If the following condition of table three is satisfied, the DCI may be determined to be a DCI that deactivates DL SPS.

Watch 2

Information fields in DCI	DCI format 1_0	DCI format 1_1
			HARQ process number	Set to all 0	Set to all 0
Redundancy version	Is set to be '00'	For the enable transport block, set to "00"

Watch III

The DCI carried by the PDCCH may consist of multiple information fields, for example, a hybrid automatic repeat request (HARQ) information field and a redundancy version (redundancy version) information field in table two, and different information fields may consist of the same number of bits (bits) or different numbers of bits (bits).

Illustratively, the HARQ process number information field is composed of 4 bits, when the terminal device parses the DCI to determine the DCI format, and determines that the DCI is DCI format 1_1, the terminal device further determines whether all 4 bits in the HARQ process number information field are 0, determines whether all 2 bits in the redundancy version information field are 0, and determines that the DCI is DCI activating DL SPS under the condition that all 4 bits in the HARQ process number information field are 0 and all 2 bits in the redundancy version information field are 0. Wherein the redundancy version information field consists of 2 bits. The number of bits in the HARQ process number information field is described as an example, and may also be 5 bits, 6 bits, or other number of bits, which is not limited in this embodiment.

Illustratively, the HARQ process number information field consists of 4 bits, the modulation coding scheme information field consists of 5 bits, and the frequency domain resource allocation information field consists of 10 bits. When the terminal equipment analyzes the DCI to judge the DCI format and determines that the DCI is the DCI format 1_0, the terminal equipment further judges whether 4 bits in the HARQ process number information domain are all 0, 2 bits in the redundancy version information domain are all 0, 5 bits in the modulation coding scheme information domain are all 1 and 10 bits in the frequency domain resource allocation information domain are all 1. Under the condition that 4 bits in the HARQ process number information field are all 0, 2 bits in the redundancy version information field are all 0, 5 bits in the modulation and coding scheme information field are all 1 and 10 bits in the frequency domain resource allocation information field are all 1, the terminal equipment judges the DCI to be the DCI for deactivating the DL SPS.

Fig. 2 is a schematic diagram of a DCI scheduling Physical Downlink Shared Channel (PDSCH) for activating DL SPS. Fig. 2 includes one BWP, where fig. 1 indicates DCI activating/deactivating DL SPS, and fig. 2 indicates DCI scheduled PDSCH or activated PDSCH activating DL SPS. In this BWP, DCI activating DL SPS triggers semi-persistent PDSCH resources. As can be seen from fig. 2, the DCI activating the DL SPS schedules one PDSCH, which is the first PDSCH of the semi-persistent PDSCH, and the semi-persistent PDSCH resources appear periodically according to the period configured by the higher layer (high layer) and the time domain position of the first PDSCH. The other PDSCHs, except for the first PDSCH of the semi-persistent PDSCH, do not have corresponding PDCCHs. The DCI deactivating the DL SPS does not schedule data, i.e., does not schedule PDSCH, and may be referred to as a non-scheduled DCI.

For type 2PUSCH and semi-persistent CSI reporting on PUSCH for uplink configuration grant, the activation/deactivation principle is similar to DL SPS. The CRC of the DCI of type 2PUSCH for activating/deactivating the uplink configuration grant can be scrambled by CS-RNTI. The CRC of DCI activating/deactivating semi-persistent CSI reporting on the PUSCH may be scrambled by semi-persistent channel state information radio network temporary identifier (SP-CSI-RNTI).

Exemplarily, the MAC CE triggered semi-persistent resource may include a semi-persistent channel state information reference signal (CSI-RS)/semi-persistent channel state information interference measurement (CSI-IM) resource set (SP CSI-RS/CSI-IM resource set), a semi-persistent zero-power CSI-RS resource set (SP ZP CSI-RS resource set), a semi-persistent Sounding Reference Signal (SRS) resource, or a CSI reporting (SP CSI reporting PUCCH) resource on a semi-persistent Physical Uplink Control Channel (PUCCH).

Fig. 3 is a schematic diagram of a format of a MAC CE for activating/deactivating a semi-persistent CSI-RS/CSI-IM resource set. Each row in fig. 3 represents 8 bits (Oct ). The "A/D" field is set to 1 for activation and 0 for deactivation. The "serving cell identity" (serving cell ID) field indicates the serving cell identity for which the MAC CE is applicable (application). The "BWP identification" (BWP ID) field indicates the identification of the MAC CE applicable (application) BWP. The "semi-persistent channel state information reference signal resource set identification" (SP CSI-RS resource set ID) field represents an index of a semi-persistent CSI-RS resource set to be activated/deactivated. The "IM" field indicates whether an 8-bit field including the "identification of the semi-persistent CSI-IM resource set" field exists, indicates that an 8-bit field including the "identification of the semi-persistent CSI-IM resource set" field exists if the "IM" field is set to 1, and indicates that an 8-bit field including the "identification of the semi-persistent CSI-IM resource set" field does not exist if the "IM" field is set to 0. The "identification of the semi-persistent CSI-IM resource set" field indicates an index of the semi-persistent CSI-IM resource set to be activated/deactivated. The "identification of TCI state (IDi)" field corresponds to the (i + 1) th resource in the set of SP CSI-RS resources to be activated for indicating the TCI state of the (i + 1) th resource, and the "identification of TCI state (IDi)" field is for indicating the identification of one TCI state (TCI state ID), where i =0,1,2 … … N, and the reference signal (resource) associated with the TCI state is the quasi co-location (QCL) source reference signal (resource) of the corresponding (i + 1) th SP CSI-RS resource. Where "R" denotes a reserved bit, which may be set to 0.

The MAC CE is carried by the PDSCH and the information it includes is typically validated 3ms after the HARQ acknowledgement (HARQ-ACK) feedback is sent for the PDSCH of the MAC CE. Illustratively, the terminal device sends PUCCH in time slot n, the PUCCH carries HARQ-ACK information, the HARQ-ACK information is HARQ feedback of PDSCH correspondingly carrying MAC CE, and then the MAC CE is in time slot

The first time slot thereafter comes into effect, i.e. the time at which the MAC CE ≥es>

And the following time slot takes effect. Wherein μ represents the subcarrier spacing configuration corresponding to the PUCCH carrying the HARQ-ACK, and/or->

Indicating the number of slots included in a sub-frame corresponding to a sub-carrier spacing μ.

Table four shows the correspondence between the subcarrier spacing and the number of slots included in the subframe.

Watch four

For the semi-persistent resource activated by the MAC CE, the network device may pre-configure a period and a period offset of the semi-persistent resource through a high-level signaling, and may calculate a candidate time domain position of the semi-persistent resource through the period and the period offset.

Fig. 4 is a diagram of MAC CE activation of semi-persistent resources. Fig. 4 includes a BWP, where legend 1 indicates activating/deactivating a MAC CE of a semi-persistent resource, legend 2 indicates activating the semi-persistent resource by the MAC CE, legend 3 indicates a candidate semi-persistent resource, after the MAC CE becomes effective, the semi-persistent resource in the BWP is activated, and the network device transmits data at a candidate time-domain position of the semi-persistent resource, or the terminal device transmits data at a candidate time-domain position of the semi-persistent resource. If the MAC CE is used to deactivate the semi-persistent resource, transmission or reception of the semi-persistent resource ceases after the deactivated MAC CE takes effect.

5. Semi-persistent active after BWP handoff

Semi-persistent activity is for a single BWP (per BWP), i.e., the effective range of semi-persistent activity is one BWP. For example, when the DCI is used to activate/deactivate the PDSCH/PUSCH, the DCI indicates the identity of the BWP in which the PDSCH/PUSCH is located. When the MAC CE is used to activate/deactivate the semi-persistent resource, the MAC CE also indicates an identifier of the BWP, where the BWP corresponding to the identifier of the BWP is the BWP to which the MAC CE is applicable, that is, the BWP for which the MAC CE information is valid.

When BWP is activated, if there is a semi-persistent activity in the active state in the BWP, if the BWP is switched, for example, the original BWP is the first BWP, and the BWP is switched to the second BWP, the semi-persistent activity in the first BWP is deactivated for DCI activation, or is referred to as cleared (cleared). For MAC CE activated semi-persistent activity, semi-persistent activity within the first BWP is typically temporarily suspended (suspended), and if the first BWP becomes active again, e.g., switches back to the first BWP from the second BWP, the semi-persistent activity previously temporarily suspended for the first BWP continues, i.e., resumes the active state.

Fig. 5 is a diagram illustrating a semi-persistent resource after BWP handover. Fig. 5 includes a first BWP and a second BWP, where legend 1 indicates activation signaling (DCI or MAC CE) and legend 2 indicates semi-persistent resources activated/scheduled by the activation signaling. The operation of DCI-triggered and MAC CE-triggered semi-persistent resources after the terminal device switches from the first BWP to the second BWP is exemplarily described below in connection with fig. 5.

Illustratively, for DCI activated downlink semi-persistent scheduled PDSCH, if the first BWP is downlink BWP and deactivated after BWP handover, the activated semi-persistent PDSCH resources in the first BWP are deactivated.

Exemplarily, for a DCI activated PUSCH for semi-persistent CSI reporting (SP CSI reporting on PUSCH), if a first BWP is an uplink BWP and the uplink BWP or downlink BWP is switched, a semi-persistent PUSCH resource activated in the uplink first BWP is deactivated.

Illustratively, for a DCI-activated PUSCH for semi-persistent CSI reporting (SP CSI reporting on PUSCH), if the first BWP is an uplink BWP, the activated semi-persistent PUSCH resource in the uplink first BWP is deactivated.

Illustratively, for a MAC CE activated semi-persistent resource, such as a SP CSI-RS/CSI-RS resource set, a SP ZP CSI-RS resource set, a SP SRS, or a semi-persistent CSI report on PUCCH, if the BWP applicable to the MAC CE is not an activated BWP and a deactivated MAC CE is not received, the semi-persistent resource activated by the MAC CE is in a suspended (suspended) state.

Whereas, the transmission configuration of the terminal device-specific PDSCH activated/deactivated for MAC CE indicates the TCI state, and if the terminal device has not received MAC CE signaling for activating the TCI state of the terminal device-specific PDSCH, the terminal device assumes that a demodulation reference signal (DMRS) port of the PDSCH and a synchronization signal physical broadcast channel block (SS/PBCH block, SSB) determined in an initial access procedure (initial access procedure) have a QCL relationship. Illustratively, the QCL relationship is "QCL-typeA" or "QCL-typeD".

That is, if the BWP is handed over, in the new BWP, if the terminal device has not received the MAC CE signaling activating the TCI state of the terminal device-specific PDSCH, or the activation MAC CE signaling has not been validated, the terminal device assumes that the DMRS port of the PDSCH has a QCL relationship with the SSB used in the initial access procedure.

Illustratively, according to "QCL-typeA", the terminal device may determine parameters such as delay spread, doppler shift, doppler spread, etc. that the PDSCH may refer to.

Illustratively, according to the "QCL-typeD", the terminal device may determine a beam direction to which the PDSCH may refer, including parameters such as an antenna direction and a precoding matrix.

Currently, NR is discussing a new type of end device, called a reduced capability (RedCap) end device, comprising three major application scenarios: wearable devices (webables), industrial wireless sensors (industrial wireless sensors), and video surveillance (vdeo surveillance) devices.

The terminal device of the RedCap supports a maximum bandwidth of 20MHz in FR1 and a maximum bandwidth of 100MHz in FR 2. While general NR enhanced mobile broadband (eMBB) terminal equipment has the capability of supporting 100MHz bandwidth in FR1, 200MHz bandwidth in FR2, and optionally 400MHz bandwidth in FR 2. As can be seen from the above description, the bandwidth capability supported by the terminal device of NR RedCap is smaller than that of the terminal device of the existing NR eMBB, because the smaller bandwidth capability can reduce the implementation complexity of the terminal device, save the power consumption of the terminal device, and is beneficial to reducing the cost of the terminal device.

Since the terminal device of the RedCap supports a smaller bandwidth, a frequency diversity gain obtained in the smaller bandwidth is smaller. In addition, long-term operation in a smaller bandwidth may result in the terminal device being affected by larger interference for a long time. Therefore, in order to improve the frequency diversity gain of the terminal device of the redmap and improve the resource utilization efficiency of the network device, the terminal device of the redmap may frequently switch the center frequency, that is, perform BWP switching.

However, as can be seen from the above description of the operation of the semi-persistent activity after BWP handover, for the DCI triggered semi-persistent activity, after the first BWP is handed over to the second BWP, the activated semi-persistent activity in the first BWP is deactivated or cleared, so the second BWP needs new DCI activation signaling if it needs to keep the semi-persistent activity in the activated state. For MAC CE triggered semi-persistent activity, after the first BWP is handed over to the second BWP, if the semi-persistent activity activated in the first BWP wants to remain active in the second BWP, a new MAC CE activation signaling is also needed for activation.

Therefore, in the frequent BWP handover process, the network device needs to send more activation/deactivation signaling for the semi-persistent activity, which may cause an increase in resource overhead, and reducing the resource overhead and improving the resource utilization efficiency become an urgent problem to be solved.

In view of this, embodiments of the present application provide a BWP handover method and a handover apparatus, where, for a first BWP and a second BWP with the same configuration, after a terminal device switches from the first BWP to the second BWP, a semi-persistent activity activated in the first BWP continues to maintain an activated state or resume the activated state in the second BWP, and after the handover, the semi-persistent activity originally in the activated state in the first BWP is temporarily suspended (suspended), that is, signaling for activating/deactivating the semi-persistent activity in the first BWP is still applicable to the second BWP, so that after the terminal device switches to the second BWP, there is no need to send a new activation/deactivation instruction, which is beneficial to reduce the overhead of activation/deactivation signaling and improve resource utilization.

In the present application, the first BWP is the BWP before the handover, and the second BWP is the BWP after the handover.

It should be understood that the configurations of the first BWP and the second BWP in the embodiment of the present application are the same, and the following two problems are mainly considered:

in a first aspect, the activation/deactivation signaling may only be in effect in both the first BWP and the second BWP, with the same configuration. For example, DCI signaling indicates that semi-persistent PDSCH resources are activated in the first BWP and semi-persistent PDSCH resources are not configured in the second BWP, then the DCI cannot activate semi-persistent PDSCH resources in the second BWP, i.e., cannot be effective.

In the second aspect, since the switching delay of BWP switching shown in table one is large, the large BWP switching delay may cause the terminal device to interrupt the data transmission and reception, which may reduce the data transmission rate, so that it is not favorable for the terminal device to perform frequent switching if BWP switching is still performed according to the BWP switching delay shown in table one.

To implement fast BWP switch (fast BWP switch) with shorter switching delay, it is necessary to satisfy that the center frequencies of BWPs before and after radio frequency switching are different, but parameters such as RRC configuration are all the same or partially different. For example, the first BWP and the second BWP share a set of RRC configuration parameters, with only the center frequency being different. Thus, after the terminal device switches to the second BWP, if the BWP switching is a situation (e.g., timer triggering) that is configured in advance and does not require signaling to trigger the switching, the time for the terminal device to analyze the signaling, calculate the radio frequency and baseband (baseband) parameters, and re-apply the RRC configuration parameters can be saved, and the terminal device can be prevented from re-performing Automatic Gain Control (AGC)/Automatic Frequency Control (AFC) adjustment, so that the switching delay of the BWP can only include the radio frequency switching/tuning (RF tuning) time, thereby reducing the BWP switching delay.

Illustratively, the end-point device of the reccap under study is expected to reduce the BWP handoff latency to between 50-200 microseconds (μ s), e.g., 140 μ s, by a fast BWP handoff.

Therefore, the BWP switching method according to the embodiment of the present application can reduce signaling overhead and improve resource utilization when performing fast BWP switching between two BWPs with the same configuration.

Fig. 6 is a flowchart illustrating a BWP handover method 600 according to an embodiment of the present application. The terminal device in method 600 is configured with a first BWP and a second BWP, the first BWP and the second BWP having the same configuration, and the first BWP and the second BWP having different center frequencies. The method 600 includes the steps of:

s601, the network device sends first information to the terminal device on a first BWP, where the first information is used to activate or deactivate a target semi-persistent activity in the first BWP, and the first BWP is an active BWP. Accordingly, the terminal device receives the first information on the first BWP.

S602, the terminal device switches from the first BWP to a second BWP, and the second BWP is the active BWP after the switching.

S603, the terminal device determines, according to the first information, a state of the target semi-persistent activity in the second BWP after the BWP handover, where the state includes an activated state and a deactivated state.

It should be understood that the execution sequence of S602 and S603 is not limited in this embodiment of the application, and the terminal device may determine the state of the target semi-persistent activity in the second BWP according to the first information before the BWP handover, and may also determine the state of the target semi-persistent activity in the second BWP according to the first information after the BWP handover.

In this embodiment, the terminal device may activate or deactivate the target semi-persistent activity in the first BWP through the first information sent by the network device, and after the terminal device switches from the first BWP to the second BWP, the terminal device may further determine, through the first information, whether the target semi-persistent activity in the second BWP is in an activated state or a deactivated state, so that after the BWP switching, the network device does not need to send a new activation/deactivation instruction to the terminal device, and the activation or deactivation signaling of the semi-persistent activity in the first BWP is also applicable to the second BWP, that is, the first information is also applicable to the second BWP, or referred to as the first information may also take effect in the second BWP, and the state of the semi-persistent activity in the first BWP may be maintained in the second BWP, which is beneficial to saving signaling overhead.

In addition, since the effective time of the MAC CE signaling is 3ms, which may cause data transmission delay, the BWP switching method provided in the embodiment of the present application may save signaling overhead, and at the same time, it is no longer necessary to activate/deactivate a semi-persistent activity for a new MAC CE, so as to avoid delay caused by the effective time of the MAC CE signaling, and further, it is beneficial to reduce data transmission delay.

It should be understood that in the embodiment of the present application, the configurations of the first BWP and the second BWP are the same, including that the first BWP and the second BWP share the same configuration.

Because the center frequencies of the first BWP and the second BWP are different, it can be understood that the frequency domain position of the target semi-persistent activity is shifted from the first BWP to the second BWP, but the relative position of the target semi-persistent activity in the second BWP is the same as the relative position of the previous target semi-persistent activity in the first BWP. It should be understood that semi-persistent activity may be understood as semi-persistent resources at this point, rather than semi-persistent state.

As an alternative embodiment, the first BWP and the second BWP have different identifications, and the configuration of the first BWP and the second BWP is the same, which means that the RRC configuration of the first BWP and the second BWP is the same except for the center frequency and the identification of the BWP.

To distinguish between different BWPs, each BWP may have its own identity (BWP ID), and thus the identities of the first BWP and the second BWP may also be different.

Wherein, the RRC configuration may include: BWP bandwidth, subcarrier spacing, control resource set (core set), search space set (SS set), quasi co-location (QCL) relationship, reference signal resource, physical Uplink Control Channel (PUCCH), rate matching (rate matching), multiple-in multiple-out (MIMO) layer number, physical Downlink Shared Channel (PDSCH), physical Uplink Shared Channel (PUSCH) configuration parameters, and the like.

Optionally, the first BWP and the second BWP may have different numbers of some resources or configurations, for example, the number of the control resource set and/or the number of the search space set, and other RRC configurations are the same. It should be understood that the first BWP and the second BWP have different center frequencies and the same bandwidth size, which also means that the start frequencies of the first BWP and the second BWP are different.

As follows, the same understanding of the two BWP configurations can be referred to herein and will not be described in detail.

Fig. 7 is a schematic diagram of a semi-persistent resource after BWP handover according to an embodiment of the present application. Fig. 7 includes a first BWP and a second BWP, where legend 1 indicates activation signaling (DCI/MAC CE), and legend 2 indicates semi-persistent resources activated by the activation signaling. As can be seen from comparison between fig. 5 and fig. 7, in fig. 7, after the terminal device switches from the first BWP to the second BWP, no new activation signaling is needed in the second BWP, and the terminal device may activate or recover the corresponding semi-persistent resource in the second BWP according to the parameters, such as the time-domain position of the first scheduled semi-persistent resource, the period of the semi-persistent resource, and the like, indicated by the activation signaling in the first BWP.

As an optional embodiment, the first information is carried by DCI. When the first information is carried by the DCI, the target semi-persistent activity includes semi-persistent resources including at least one of: a PDSCH resource of a DL semi-persistent scheduling (DL SPS), a type 2PUSCH (UL configured grant type2 PUSCH) resource of an uplink configuration grant, and a PUSCH resource for semi-persistent CSI reporting.

When the first information is carried by the DCI, the RNTI scrambling the DCI carrying the first information includes: CS-RNTI and SP-CSI-RNTI.

Taking the above downlink semi-persistent scheduling (DL SPS) as an example, the network device may configure downlink semi-persistent transmission through higher layer signaling. The higher layer configuration includes parameters such as the period of the DL SPS, the hybrid HARQ process number, the PDSCH for the DL SPS, the PUCCH resource for HARQ feedback of the PDSCH, and a Modulation and Coding Scheme (MCS) table for the DL SPS.

As an alternative embodiment, the first information is carried by the MAC CE. When the first information is carried by the MAC CE, the target semi-persistent activity includes semi-persistent resources and/or semi-persistent states, the semi-persistent states include PUCCH spatial relationship and/or a transmission configuration indication TCI state of a terminal device-specific PDSCH, and the semi-persistent resources include at least one of: the system comprises semi-continuous CSI-RS resources, semi-continuous CSI-IM resources, semi-continuous ZP CSI-RS resources, semi-continuous SRS resources or PUCCH resources for semi-continuous CSI reporting.

For the transmission configuration indication TCI status of the terminal device dedicated PDSCH, the network device may pre-configure a plurality of TCI statuses, for example, 128 TCI statuses at most, and the MAC CE is used to indicate which of the TCI statuses preconfigured by the network device are activated and which are deactivated.

For the PUCCH spatial relationship, the MAC CE is used to activate/deactivate the spatial relationship of the PUCCH resources, and only one PUCCH spatial relationship of one PUCCH resource is activated at the same time. Specifically, the network device may pre-configure up to 8 pieces of PUCCH spatial relationship information, where the MAC CE is configured to indicate one PUCCH resource and indicate one PUCCH spatial relationship information that the PUCCH resource is activated, and meanwhile, the MAC CE is configured to indicate that other PUCCH spatial relationship information is deactivated. The PUCCH spatial relationship information includes parameters such as spatial setting (spatial setting) to be used when the terminal device transmits the PUCCH and PUCCH power control. The PUCCH spatial relationship information is used to indicate a reference signal resource, and spatial configuration when the PUCCH is transmitted may be the same as spatial configuration when the reference signal resource is transmitted or received.

Four implementations are described below that do not require re-sending of activation/deactivation signaling after BWP handover.

Implementation mode 1: when the first information is carried by the MAC CE, the MAC CE includes an identification of the first BWP and an identification of the second BWP.

In this embodiment, the network device and the terminal device may specify, by a protocol, that a format of the MAC CE is extended, so that the MAC CE may simultaneously include identifications of multiple BWPs, and thus, if one MAC CE for activating/deactivating the semi-persistent activity includes identifications of the first BWP and the second BWP, the MAC CE is applicable to the BWP corresponding to the identifications of the two BWPs. The mode of changing the format of the MAC CE can also save the overhead of resending the activation/deactivation signaling after the BWP switching, so that the indication is more flexible.

As can be seen from fig. 3, the format of the MAC CE includes an identifier of one BWP, and the identifiers of multiple BWPs extended in the embodiment of the present application may be located in reserved bits or in an extra added bit field, where the positions of the identifiers of multiple BWPs are not limited in the embodiment of the present application.

Implementation mode 2: in the embodiment of the present application, it may be specified by a protocol that, in case that the configurations of the first BWP and the second BWP are the same, then the activation/deactivation signaling of the semi-persistent activity in the first BWP is applicable to the second BWP. For example, a terminal device and a network device that conform to the 3gpp Release 17 (R17) and later may perform the BWP handover method provided in the embodiments of the present application. According to the terminal device and the network device which conform to the protocol of the 3GPP R15/16, even if the first BWP and the second BWP have the same configuration, the activation signaling of the semi-persistent activity in the first BWP is not suitable for the second BWP.

The first BWP and the second BWP have the same configuration, and as described above, are not described again.

Implementation mode 3: the terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handoff according to the first information and the configuration information. Specific implementations are described with reference to the following.

Fig. 8 is a flowchart illustrating another BWP handover method 800 according to an embodiment of the present application. The method 800 includes the steps of:

s810, the network device sends configuration information to the terminal device, where the configuration information is used to configure that the first BWP and the second BWP belong to the same BWP group, or configure common parameters of the first BWP and the second BWP. Accordingly, the terminal device receives the configuration information.

S820, the network device sends first information to the terminal device, where the first information is used to activate or deactivate the target semi-persistent activity in the first BWP, where the first BWP is an active BWP. Accordingly, the terminal device receives the first information on the first BWP.

S830, the terminal device switches from the first BWP to a second BWP, and the second BWP is the active BWP after the switching.

S840, the terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handover according to the first information and the configuration information.

It should be understood that the configuration information is sent by the network device to the terminal device via higher layer signaling. The signaling overhead of transmitting the configuration information is less than the overhead of re-transmitting the activation/deactivation signaling in the second BWP. It should be understood that if the configuration information is only used for configuring the BWP parameters of the first BWP and the second BWP, no additional configuration signaling overhead is added.

(1) The configuration information is used to configure the first BWP and the second BWP to belong to the same BWP group. In this case, the configuration parameters of the first BWP and the second BWP may be configured for the first BWP and the second BWP respectively by the network device, that is, each parameter of the first BWP and the second BWP is configured separately, but most parameters of the separately configured parameters are the same. For example, the center frequency (or start frequency) of the separately configured BWPs is different, but other RRC configurations of the separately configured BWPs are the same, so the network device may configure the first BWP and the second BWP to belong to the same BWP group (BWP group).

Illustratively, the terminal device has 4 BWPs, and these four BWPs can be denoted as BWP1, BWP 2, BWP 3, BWP 4,1, 2, 3, 4 respectively representing the identifications of these four BWPs. The network device may configure BWP1 with a group identifier 1 through the configuration information, configure BWP 3 with a group identifier 1 through the configuration information, and after receiving the configuration information, the terminal device may determine that BWP1 and BWP 3 belong to the same BWP group, so that after the terminal device switches from BWP1 to BWP 3, the signaling (first information) originally used to activate/deactivate the semi-persistent activity in BWP1 is still applicable to BWP 3, that is, the corresponding semi-persistent activity in BWP 3 determined according to the first information continues to maintain the activated state or the deactivated state originally in BWP 1. Likewise, after the terminal device switches from BWP identified as 3 to BWP identified as 1, the signaling originally used to activate/deactivate semi-persistent activity in BWP 3 is still applicable to BWP 1.

In this embodiment, the terminal device may determine that the first BWP and the second BWP belong to the same BWP group through the configuration information, which may enable the terminal device to quickly determine whether signaling for activating/deactivating the semi-persistent activity in the first BWP after BWP handover is applicable to the second BWP only by determining whether the group identifiers are the same.

In addition, if BWP 2 is also configured the same as BWP1 and BWP 3, but BWP 2 is not configured by the network device and belongs to the same BWP group as BWP1 and BWP 3, in this case, if the terminal device switches from BWP1 to BWP 2, the signaling (first information) originally used to activate/deactivate the semi-persistent activity in BWP1 is not applicable to BWP 2.

(2) The configuration information is used to configure common parameters of the first BWP and the second BWP. In this case, the common parameter is a parameter commonly configured by the network device for the first BWP and the second BWP, the network device only needs to configure the common parameter once, and the first BWP and the second BWP can share the common parameter, so that only a small amount of configuration information of the first BWP and the second BWP is separately configured, such as a center frequency (or a start frequency), an identification of the BWP. Optionally, the number of the control resource set and/or the number of the search space set may also be configured separately. If the parameters of the first BWP and the second BWP are configured in a manner of sharing common parameters, the activation/deactivation signaling of the semi-persistent activity in the first BWP is applicable to the second BWP without the network device re-sending the signaling for activating/deactivating the semi-persistent activity in the second BWP.

For downlink BWP, the common parameters include at least one of: PDCCH configuration (PDCCH-configuration), PDSCH configuration (PDSCH-configuration), semi-persistent scheduling configuration (sps-configuration), and radio link monitoring configuration (radio link monitoring configuration).

For upstream BWP, the common parameters include at least one of: PUCCH configuration (PUCCH-configuration), PUSCH configuration (PUSCH-configuration), configured grant configuration (configured grant configuration), SRS configuration (SRS-configuration), and beam failure recovery configuration (beam failure recovery configuration).

Optionally, if the parameters of the first BWP and the second BWP are configured separately, and the first BWP and the second BWP do not share any configuration information, but the configurations of the two BWPs are the same, the activation/deactivation signaling of the semi-persistent activity in the first BWP is not applicable to the second BWP.

It should be understood that for the MAC CE activated semi-persistent resource/semi-persistent state, if switching from the first BWP or the second BWP to the third BWP, the third BWP and the first BWP/second BWP do not share the same configuration or belong to the same BWP group, the activated or temporarily suspended semi-persistent resource/semi-persistent state in the first BWP or the second BWP is temporarily suspended or continues to maintain the temporarily suspended state.

It should be understood that for DCI activated semi-persistent resources, if switching from the first BWP or the second BWP to the third BWP, the third BWP and the first BWP/second BWP do not share the same configuration or belong to the same BWP group, the activated or temporarily suspended semi-persistent resources in the first BWP or the second BWP are deactivated.

In case it is determined that the activation/deactivation signaling of the semi-persistent activity in the first BWP is applicable to the second BWP according to the above configuration information, if the first information is used to activate the target semi-persistent activity in the first BWP, the state of the target semi-persistent activity in the second BWP after the BWP handover is the activated state. If the first information is used to deactivate the target semi-persistent activity in the first BWP, the state of the target semi-persistent activity in the second BWP after the BWP handoff is a deactivated state.

Implementation mode 4: the terminal device determines the state of the target semi-persistent activity in the second BWP after switching the BWP according to the first information and the second information. Specific implementations are described with reference to the following.

Fig. 9 is a flowchart illustrating a BWP handover method 900 according to an embodiment of the present application. The method 900 includes the steps of:

s910, the network device sends first information to the terminal device, where the first information is used to activate or deactivate the target semi-persistent activity in the first BWP, where the first BWP is an active BWP. Accordingly, the terminal device receives the first information on the first BWP.

S920, the network device sends second information to the terminal device, where the second information is used to indicate whether the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. Accordingly, the terminal device receives the second information.

Optionally, the second information is carried by RRC signaling or DCI.

S930, the terminal device switches from the first BWP to a second BWP, and the second BWP is the active BWP after the switching.

S940, the terminal device determines a state of the target semi-persistent activity in the second BWP after the BWP handover according to the first information and the second information.

In this embodiment, the terminal device may determine, according to the second information, whether the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP, that is, determine whether the activation/deactivation signaling of the semi-persistent activity in the first BWP is applicable to the second BWP.

Illustratively, the network device may carry 1-bit second information through RRC signaling, and when the 1-bit second information is "0", indicate that the first information is not effective for the second BWP after the terminal device switches from the first BWP to the second BWP, that is, the activation/deactivation signaling of the semi-persistent activity in the first BWP is not applicable to the second BWP. When the 1-bit second information is "1", the first information is effective for the second BWP after the terminal device is switched from the first BWP to the second BWP, that is, the activation/deactivation signaling of the semi-persistent activity in the first BWP is applicable to the second BWP. In this way, by means of RRC signaling indication, the network device only needs to send RRC signaling once and carries 1-bit second information in the RRC signaling, so as to indicate the state of the semi-persistent activity in the second BWP, and does not need to send signaling for activating/deactivating the semi-persistent activity in the second BWP again, which is beneficial to saving signaling overhead.

For example, when the second information is carried by DCI, the DCI for carrying the second information may be DCI for triggering BWP handover, that is, when the network device sends the DCI instructing the BWP handover to the terminal device in the first BWP, the DCI may further carry second information for instructing whether the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP, so that the network device only needs to send the DCI instructing the BWP handover once, which is beneficial to reducing signaling overhead.

Optionally, when the second information is carried by DCI, the DCI format carrying the second information may further include DCI format 2_0, DCI format 1_0 or DCI format 1_1 or DCI format 0_0 or DCI format 0_1.

Further, it may be specified or configured whether the first information is valid for the second BWP when the terminal device does not receive the second information. For example, if the terminal device does not receive the second information, it indicates that the first information is not valid for the second BWP after the terminal device switches from the first BWP to the second BWP, that is, the first information is not applicable to the second BWP.

In case that it is determined that the activation/deactivation signaling of the semi-persistent activity in the first BWP is applicable to the second BWP according to the second information, if the first information is used to activate the target semi-persistent activity in the first BWP, the state of the target semi-persistent activity in the second BWP after the BWP handover is the activated state. If the first information is used to deactivate the target semi-persistent activity in the first BWP, the state of the target semi-persistent activity in the second BWP after the BWP handoff is a deactivated state.

Fig. 10 is a flowchart illustrating a BWP handover method 10 according to an embodiment of the present application. The method 10 comprises the steps of:

s1010, the network device sends first information to the terminal device, where the first information is used to activate or deactivate the target semi-persistent activity in the first BWP, where the first BWP is an active BWP. Accordingly, the terminal device receives the first information on the first BWP.

S1020, the network device sends second information to the terminal device, where the second information is used to indicate whether the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP. Accordingly, the terminal device receives the second information.

S1030, the network device sends third information to the terminal device, where the third information is used to indicate that the first information is not valid for the second BWP after the terminal device switches from the first BWP to the second BWP. Accordingly, the terminal device receives the third information.

S1040, the terminal device switches from the first BWP to a second BWP, and the second BWP is the active BWP after the switching.

S1050, the terminal device determines a state of the target semi-persistent activity in the second BWP after the BWP handover according to the first information, the second information and the third information.

In this embodiment of the application, in a case that the second information is carried by RRC signaling, if the second information is used to indicate that the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP, after the terminal device receives the second information from the network device, the terminal device may further receive third information from the network device, where the third information may be carried by DCI, for example, the third information may be indicated by DCI format 2_0, DCI format 1_0, DCI format 1_1, DCI format 0_0, or DCI format 0_1. After receiving the third information, the terminal device determines that the state of the target semi-persistent activity in the second BWP after the BWP handover is the deactivated state or the suspended state, and needs to activate a new activation signaling or resume the target semi-persistent activity to the activated state.

In the embodiment of the present application, since the configuration period of the RRC signaling is long, for example, configured once in half an hour or an hour, and the DCI carrying the third information may be dynamically transmitted in real time, the implementation is relatively flexible. When the state of the semi-persistent resource in the first BWP is maintained to the second BWP, there is a possibility of a conflict with the resource in the second BWP. For example, the terminal device 1 may be transmitting data within the second BWP, for example, transmitting PUSCH/PUCCH/SRS, and if the terminal device 2 switches from the first BWP to the second BWP at this time, and the active state of the PUSCH/PUCCH/SRS activated in the first BWP is maintained to the second BWP, resource collision may occur after the terminal device 2 switches from the first BWP to the second BWP, which may affect data transmission of the terminal device.

Therefore, the network device may dynamically indicate, by the third information, that the first information is not effective for the second BWP after the terminal device switches from the first BWP to the second BWP, that is, cancel the second information indicating effective before, in a case where the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. Alternatively, the network device may directly indicate, through the second information, that the first information is not valid for the second BWP after the terminal device switches from the first BWP to the second BWP, so that the collision problem of the last half persistent resource after the BWP switch can be effectively avoided.

It should be understood that if the second information is used to indicate that the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP and the terminal device does not receive the third information, the first information is still applicable to the second BWP after the terminal device switches from the first BWP to the second BWP and the semi-persistent active activation/deactivation state in the first BWP is still maintained to the second BWP.

For example, the DCI for carrying the third information may also be a DCI for triggering BWP handover, that is, when the network device sends a DCI indicating to perform BWP handover to the terminal device in the first BWP, the DCI may further carry third information indicating that the first information is not effective for the second BWP after the terminal device switches from the first BWP to the second BWP, which is also beneficial to reducing signaling overhead and avoiding resource collision. Optionally, the second information may also be carried by the MAC CE. The second information carried by the MAC CE may also dynamically indicate whether the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP.

Optionally, if the second information is used to indicate that the first information is not valid for the second BWP after the terminal device switches from the first BWP to the second BWP, the network device may not send the third information, and the terminal device may not receive the third information.

Optionally, the third information has a certain effective time length. Illustratively, the third information is only effective for the next BWP handover. For example, the second information is used to indicate that the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP, the terminal device receives the third information before switching from the first BWP to the second BWP, and the third information indicates that the first information is not valid for the second BWP after the terminal device switches from the first BWP to the second BWP, then after switching to the second BWP, if the terminal device receives the fourth information again at the second BWP, e.g., the fourth information is similar to the first information, and is used to activate or deactivate the target semi-persistent activity in the second BWP, then if the terminal device switches from the second BWP to the first BWP again, the fourth information still applies to the first BWP, and if the network device wants the fourth information not to apply to the first BWP, the network device wants to resend the third information, e.g., 1 bit in DCI instructing to switch from the second BWP to the first BWP is set to 0, which indicates that the terminal device switches from the second BWP to the first BWP to the second BWP.

As in the above embodiments of S910 and S1010, the first BWP and the second BWP may also be configured to belong to the same BWP group, or the first BWP and the second BWP are configured by sharing a common parameter.

Optionally, if the first BWP and the second BWP do not belong to the same BWP group, or the first BWP and the second BWP are not configured in a manner of sharing a common parameter, the method of this embodiment, that is, the method in the existing protocol, is not used.

As an alternative embodiment, if the first information is used to activate the target semi-persistent activity in the first BWP, after S602, after the method 600, the method 800, the method 900, and the method 10, the method may further include: the terminal device temporarily suspends the target semi-persistent activity within the first BWP.

In the embodiment of the present application, whether the activation signaling is DCI or MAC CE, after the terminal device switches from the first BWP to the second BWP, the target semi-persistent activity in the first BWP is temporarily suspended, so that if the terminal device switches from the second BWP back to the first BWP, the temporarily suspended target semi-persistent activity in the first BWP may resume the activation state, which may also reduce the signaling overhead of re-sending the activation signaling to activate the target semi-persistent activity in the first BWP compared to the way that the target semi-persistent activity in the first BWP is deactivated or cleared after the BWP is switched.

The following describes the state change of the DCI-triggered semi-persistent resource in detail with reference to fig. 11. Fig. 11 is a schematic diagram of a DCI activated DL SPS according to an embodiment of the present application. Fig. 11 includes a first BWP and a second BWP, where legend 1 indicates DCI activating/deactivating DL SPS (referred to as first DCI), and legend 2 indicates DCI scheduling/activated PDSCH activating DL SPS. As shown in fig. 11, the time domain resources of the first PDSCH triggered by the first DCI are determined by the resources scheduled by the first DCI, after which the time domain resources occur repeatedly according to a period (T). If the terminal device switches from the first BWP to the second BWP, the time domain resource of the PDSCH in the second BWP is determined according to the period and the resource of the PDSCH in the first BWP.

If the first BWP is deactivated (e.g., the terminal device switches from the first BWP to the second BWP) and DCI deactivating the semi-persistent PDSCH is not received in the first BWP, the semi-persistent PDSCH in the first BWP is temporarily suspended. Thereafter, if the first BWP is reactivated (e.g., the terminal device switches from the second BWP to the first BWP), the semi-persistent PDSCH in the first BWP resumes the active state if the DCI deactivating the semi-persistent PDSCH is not received in the second BWP.

The following description will take the state change of the MAC CE triggered semi-persistent activity as an example.

(1) Activation and deactivation of semi-persistent CSI-RS/CSI-IM/ZP CSI-RS/SRS resource sets

Illustratively, when a first BWP is active BWP, the terminal device receives a first MAC CE, which is used to determine a resource set (e.g., semi-persistent CSI-RS/CSI-IM/ZP CSI-RS/SRS resource set), and specifically, the first MAC CE includes an identification of a resource set, and the first MAC CE is used to determine and activate the resource set corresponding to the identification of the resource set. In the first BWP, the set of resources determined by the first MAC CE is active.

When the terminal device switches from the first BWP to the second BWP, the second BWP is the active BWP, and the first BWP is deactivated, the resource set determined by the first MAC CE in the first BWP becomes the suspended state, and the resource set determined by the first MAC CE in the second BWP becomes the active state. If a second MAC CE is received in the second BWP, the second MAC CE comprises a resource set identification, the second MAC CE is used for determining and deactivating a resource set corresponding to the resource set identification, and the resource set identifications determined by the first MAC CE and the second MAC CE are the same. The set of resources determined by the first MAC CE is deactivated in the second BWP, and likewise, the second MAC CE is also applicable to the first BWP, where the set of resources determined by the first MAC CE is changed from the suspended state to the deactivated state.

(2) Activation and deactivation of PUCCH resources for semi-persistent CSI reporting

Exemplarily, the first MAC CE and the second MAC CE are configured to determine a semi-persistent CSI reporting configuration, where the identifiers of the semi-persistent CSI reporting configurations determined by the first MAC CE and the second MAC CE are the same, and the semi-persistent CSI reporting configuration includes a configuration of a semi-persistent PUCCH resource. The first MAC CE is used for activating the semi-persistent CSI reporting configuration, and the second MAC CE is used for deactivating the semi-persistent CSI reporting configuration. The semi-persistent PUCCH resource configured in the semi-persistent CSI reporting configuration may also be referred to as a semi-persistent PUCCH resource determined by the first MAC CE or the second MAC CE.

When one BWP of the first BWP and the second BWP is the active BWP, for example, the first BWP is the active BWP, the terminal device receives the first MAC CE on the first BWP, and the semi-persistent CSI reporting configuration determined by the MAC CE is in the active state, that is, the semi-persistent PUCCH resource determined by the first MAC CE is in the active state.

If the terminal device does not receive the second MAC CE and the terminal device is switched from the first BWP to the second BWP, the semi-persistent CSI reporting configuration determined by the first MAC CE in the first BWP becomes the suspended state, and the semi-persistent CSI reporting configuration determined by the first MAC CE in the second BWP becomes the activated state.

If the terminal device receives the second MAC CE in the first BWP or the second BWP, for example, the second MAC CE is received in the second BWP, the semi-persistent CSI reporting configuration determined by the second MAC CE in the second BWP is deactivated. In addition, if the semi-persistent CSI reporting configuration that is the same as the semi-persistent CSI reporting configuration determined by the second MAC CE is in the suspended state in the first BWP, the semi-persistent CSI reporting configuration in the suspended state also becomes the deactivated state, that is, the second MAC CE is also applicable to the first BWP.

(3) Activation and deactivation of TCI state for terminal device dedicated PDSCH

Illustratively, the first MAC CE is configured to determine an activated TCI state in the first BWP and the second BWP, and when one of the BWPs is activated, for example, the first BWP is an active BWP, the terminal device receives the first MAC CE on the first BWP, and the terminal device may determine the activated TCI state in the first BWP according to the first MAC CE. When the terminal device switches from the first BWP to the second BWP, the first MAC CE is also applicable to the second BWP, and the terminal device may determine the TCI state activated in the second BWP according to the first MAC CE, where the TCI state activated in the first BWP and the TCI state activated in the second BWP according to the first MAC CE are the same.

(4) Activation and deactivation of PUCCH spatial relationships

Illustratively, the first MAC CE is used to activate PUCCH spatial relationship information of PUCCH resources in the first BWP and the second BWP, the identity of the PUCCH resource and the identity of the activated PUCCH spatial relationship information are indicated by the first MAC CE, when the first BWP or the second BWP is the active BWP, for example, the first BWP is the active BWP, the terminal device receives the first MAC CE on the first BWP, the PUCCH spatial relationship information determined by the first MAC CE in the first BWP is activated, and after the terminal device switches from the first BWP to the second BWP, the first MAC CE is also applied to the second BWP, and the PUCCH spatial relationship information determined by the first MAC CE in the second BWP is activated.

It should be understood that one MAC CE is used to determine an identity of one configuration, and if the MAC CE is applicable to both the first BWP and the second BWP, the identity of the configuration determined by the MAC CE corresponds to an identity of the configuration in the first BWP when the first BWP is active BWP, and corresponds to an identity of the configuration in the second BWP when the second BWP is active BWP.

As an optional embodiment, before S602, the method 600 further includes: the terminal device receives fourth information from the network device, the fourth information being used to instruct the terminal device to switch from the first BWP to the second BWP. S602 includes: the terminal device switches from the first BWP to the second BWP based on the fourth information.

In the embodiment of the present application, the terminal device performs BWP switching by receiving fourth information for instructing the terminal device to perform BWP switching.

Optionally, the fourth information is carried by DCI or RRC signaling.

As an alternative embodiment, S602 includes: the terminal device performs BWP switching according to the network device semi-statically configured BWP switching time (or BWP switching timing), for example, performs BWP switching at the time when the deactivation timer expires, and the deactivation timer is semi-statically configured by the network device. Or the terminal device performs BWP switching by default at certain data transmission according to protocol specification, for example, when the terminal device performs PUCCH/PUSCH frequency hopping transmission, a first hop is transmitted on a first BWP and a second hop is transmitted on a second BWP, based on which, the terminal device can switch to realize PUCCH/PUSCH frequency hopping transmission on different BWPs through BWP.

It should be understood that, in the present application, if the first information is applicable to the second BWP, the first information is also used for determining a semi-persistent activity in the second BWP, the semi-persistent activity determined in the second BWP and the semi-persistent activity determined in the first BWP by the first information are configured in the same way, so that it can be considered that the semi-persistent activity determined in the second BWP and the semi-persistent activity determined in the first BWP by the first information are the same semi-persistent activity, or that the target semi-persistent activity determined in the first BWP by the first information is continuously maintained to the second BWP, and the state of the target semi-persistent activity in the second BWP is determined according to the first information.

Alternatively, consider a case where the first BWP and the second BWP are the same in configuration, and the first BWP and the third BWP are different in configuration, and the terminal device receives the first information at the first BWP, where the first information is used to activate or deactivate the target semi-persistent activity in the first BWP, and if the terminal device switches from the first BWP to the third BWP first and then switches from the third BWP to the second BWP, the first information is not applicable to the second BWP, that is, this embodiment of the application is not applicable.

As an implementation, at least one of the following is aimed at: the MAC CE triggered semi-persistent CSI-RS resource set, semi-persistent CSI-IM resource set, etc. may modify the format of Information Element (IE) CSI resource configuration (CSI-ResourceConfig), so that the same CSI resource configuration IE may include multiple BWP IDs. In this way, when configuring the first BWP and the second BWP having the same configuration, the first BWP and the second BWP may be associated simultaneously by one CSI resource configuration IE, and there is no need to configure 2 cells for the first BWP and the second BWP, which may save configuration signaling overhead.

Optionally, in this application, the semi-persistent activity includes a semi-persistent state, and the MAC CE used for activating the semi-persistent state further includes at least one of the following: MAC CE (Aperiodic CSI Trigger State selection MAC CE) for Aperiodic CSI Trigger State subset selection, MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for TCI State Indication of terminal device-specific PDCCH (for example, in case that the numbers of control resource sets having the same configuration of the first BWP and the second BWP are also the same, MAC CE (i.e., first information) for TCI State Indication of terminal device-specific PDCCH may also be applicable to the second BWP).

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

The switching method of the BWP according to the embodiment of the present application is described in detail above with reference to fig. 1 to 11, and the switching apparatus of the BWP according to the embodiment of the present application will be described in detail below with reference to fig. 12 and 13.

Fig. 12 shows a schematic block diagram of a BWP switching apparatus 1200 according to an embodiment of the present application, where the apparatus 1200 includes a receiving module 1210 and a processing module 1220.

Wherein, the receiving module 1210 is configured to: first information is received from a network device on a first BWP, the first information for activating or deactivating a target semi-persistent activity in the first BWP, the first BWP being an active BWP. The processing module 1220 is configured to: switching from the first BWP to a second BWP, wherein the second BWP is an active BWP after the switching; and determining the state of the target semi-persistent activity in the second BWP after the BWP handoff according to the first information, wherein the state comprises an activated state and a deactivated state.

Optionally, the identities of the first BWP and the second BWP are different, and the configuration is the same as the RRC configuration except for the center frequency and the identity of the BWP.

Optionally, the first BWP and the second BWP belong to the same BWP group, or the first BWP and the second BWP share the same common configuration parameters.

Optionally, the receiving module 1210 is configured to: second information is received from the network device, the second information indicating whether the first information is valid for the second BWP after the handover from the first BWP to the second BWP. The processing module 1220 is configured to: and determining the state of the target semi-persistent activity in the second BWP after switching the BWP according to the first information and the second information.

Optionally, the second information is carried by RRC signaling or downlink control information DCI.

Optionally, the first information is used to activate target semi-persistent activity in the first BWP, and the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. The processing module 1220 is configured to: and determining the state of the target semi-persistent activity in the second BWP after the BWP handoff as the active state according to the first information and the second information.

Optionally, the first information is used to deactivate the target semi-persistent activity in the first BWP, and the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP. The processing module 1220 is configured to: and determining the state of the target semi-persistent activity in the second BWP after switching the BWP as a deactivation state according to the first information and the second information.

Optionally, the second information is carried by RRC signaling, and the second information is used to indicate that the first information takes effect on the second BWP after the terminal device switches from the first BWP to the second BWP. The receiving module 1210 is configured to: and receiving third information from the network device, wherein the third information is used for indicating that the first information is not effective for the second BWP after the first BWP is switched to the second BWP, and the third information is carried by the DCI.

Optionally, the first information is carried by DCI.

Optionally, the target semi-persistent activity comprises semi-persistent resources comprising at least one of: downlink semi-persistent scheduling PDSCH resources, uplink configuration authorized type 2PUSCH resources, and PUSCH resources for reporting semi-persistent CSI.

Optionally, the first information is carried by the MAC CE.

Optionally, the target semi-persistent activity comprises semi-persistent resources and/or semi-persistent states, the semi-persistent states comprising PUCCH spatial relationships and/or a transmission TCI state of the terminal device specific PDSCH, the semi-persistent resources comprising at least one of: a semi-persistent CSI-RS resource, a semi-persistent CSI-IM resource, a semi-persistent ZP CSI-RS resource set, a semi-persistent SRS resource, or a PUCCH resource for semi-persistent CSI reporting (SP CSI reporting on PUCCH).

Optionally, the MAC CE includes an identification of the first BWP and an identification of the second BWP.

Optionally, the first information is used for activating a target semi-persistent activity in said first BWP. The processing module 1220 is configured to: temporarily suspending the target semi-persistent activity within the first BWP.

In an alternative example, as will be understood by those skilled in the art, the apparatus 1200 may be embodied as the terminal device in the above embodiment, or the functions of the terminal device in the above embodiment may be integrated in the apparatus 1200. The above functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above. The apparatus 1200 may be configured to perform each flow and/or step corresponding to the terminal device in the foregoing method embodiment.

It should be appreciated that the apparatus 1200 herein is embodied in the form of functional modules. The term module herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an embodiment of the present application, the apparatus 1200 in fig. 12 may also be a chip or a chip system, for example: system on chip (SoC).

Fig. 13 is a schematic block diagram illustrating another BWP switching apparatus 1300 according to an embodiment of the present application. The apparatus 1300 includes a processor 1310, a transceiver 1320, and a memory 1330. Wherein the processor 1310, the transceiver 1320, and the memory 1330 are in communication with each other through the interconnection, the memory 1330 is configured to store instructions, and the processor 1310 is configured to execute the instructions stored in the memory 1330 to control the transceiver 1320 to transmit and/or receive signals.

It should be understood that the apparatus 1300 may be embodied as an electronic device in the foregoing embodiments, or functions of the electronic device in the foregoing embodiments may be integrated in the apparatus 1300, and the apparatus 1300 may be configured to perform each step and/or flow corresponding to the electronic device in the foregoing method embodiments. Alternatively, the memory 1330 may include a read-only memory and a random access memory and provide instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 1310 may be configured to execute the instructions stored in the memory, and when the processor executes the instructions, the processor may perform the steps and/or processes corresponding to the electronic device in the method embodiments described above.

It should be understood that, in the embodiment of the present application, the processor 1310 may be a Central Processing Unit (CPU), and the processor may also be other general processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory and combines hardware thereof to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.

Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the 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 can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the module described above 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, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or 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 modules, and may be in an electrical, mechanical or other form.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

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

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

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

Claims (18)

1. A method for switching a bandwidth part BWP, the method being applied to a terminal device configured with a first BWP and a second BWP, the first BWP and the second BWP having the same configuration, and the first BWP and the second BWP having different center frequencies, the method comprising:

the terminal device receives first information from a network device on the first BWP, wherein the first information is used for activating or deactivating target semi-persistent activity in the first BWP, and the first BWP is activation BWP;

the terminal device is switched to the second BWP from the first BWP, and the second BWP is an active BWP after the switching;

and the terminal device determines the state of the target semi-persistent activity in the second BWP after the BWP handover according to the first information, wherein the state comprises an activated state and a deactivated state.

2. The method according to claim 1, wherein the first BWP and the second BWP have different identities and the configuration is the same except for the center frequency and identity of BWP.

3. The method according to claim 1 or 2, wherein the first BWP and the second BWP belong to the same BWP group or share the same common configuration parameters.

4. The method according to any one of claims 1-3, further comprising:

the terminal device receiving second information from the network device, the second information indicating whether the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP;

the determining, by the terminal device, the state of the target semi-persistent activity in the second BWP after BWP handover according to the first information includes:

and the terminal device determines the state of the target semi-continuous activity in the second BWP after the BWP switching according to the first information and the second information.

5. The method of claim 4, wherein the second information is carried by RRC signaling or Downlink Control Information (DCI).

6. The method according to claim 4 or 5, wherein the first information is used for activating the target semi-persistent activity in the first BWP, and the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP;

the determining, by the terminal device, a state of the target semi-persistent activity in the second BWP after BWP handover according to the first information and the second information includes:

and the terminal equipment determines that the state of the target semi-continuous activity in the second BWP after the BWP switching is an active state according to the first information and the second information.

7. The method according to claim 4 or 5, wherein the first information is used for deactivating the target semi-persistent activity in the first BWP, and wherein the second information indicates that the first information is effective for the second BWP after the terminal device switches from the first BWP to the second BWP;

the determining, by the terminal device, a state of the target semi-persistent activity in the second BWP after BWP handover according to the first information and the second information includes:

and the terminal equipment determines that the state of the target semi-continuous activity in the second BWP after the BWP handover is a deactivated state according to the first information and the second information.

8. The method according to any of claims 4-7, wherein the second information is carried by RRC signaling, the second information indicating that the first information is valid for the second BWP after the terminal device switches from the first BWP to the second BWP;

after the terminal device receives the second information from the network device, the method further includes:

the terminal device receives third information from the network device, where the third information is used to indicate that the first information is not effective for the second BWP after the terminal device switches from the first BWP to the second BWP, and the third information is carried by DCI.

9. The method of any one of claims 1-8, wherein the first information is carried by DCI.

10. The method of claim 9, wherein the target semi-persistent activity comprises semi-persistent resources comprising at least one of:

the method comprises the steps of Physical Downlink Shared Channel (PDSCH) resources of downlink semi-persistent scheduling, type2 Physical Uplink Shared Channel (PUSCH) resources of uplink configuration authorization and PUSCH resources for reporting semi-persistent Channel State Information (CSI).

11. The method according to any of claims 1-8, wherein the first information is carried by a medium access control element, MAC CE.

12. The method of claim 11, wherein the target semi-persistent activity comprises semi-persistent resources and/or semi-persistent states, wherein the semi-persistent states comprise Physical Uplink Control Channel (PUCCH) spatial relationships and/or Transmission Configuration Indication (TCI) states of terminal device specific PDSCH, and wherein the semi-persistent resources comprise at least one of:

the method comprises the steps of obtaining semi-continuous channel state information reference signal (CSI-RS) resources, semi-continuous channel state information interference measurement (CSI-IM) resources, semi-continuous Zero Power (ZP) CSI-RS resources, semi-continuous Sounding Reference Signal (SRS) resources or Physical Uplink Control Channel (PUCCH) resources for reporting the semi-continuous CSI.

13. The method according to claim 11 or 12, wherein the MAC CE comprises an identification of the first BWP and an identification of the second BWP.

14. The method according to any of claims 1-13, wherein if the first information is used to activate the target semi-persistent activity in the first BWP, after the terminal device switches from the first BWP to the second BWP, the method further comprises:

the terminal device temporarily suspends the target semi-persistent activity within the first BWP.

15. A switching device for BWP, characterized in that it comprises means for carrying out the method according to any one of claims 1 to 14.

16. A switching apparatus of BWP, comprising a processor and a memory; the memory for storing one or more computer programs that, when executed, cause the method of any of claims 1-14 to be performed.

17. A computer-readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1-14.

18. A computer program product, the computer program product comprising: computer program code for implementing the method according to any of claims 1-14 when said computer program code is run.

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