CN114747278B

CN114747278B - Method and related device for detecting downlink control channel

Info

Publication number: CN114747278B
Application number: CN202180006910.9A
Authority: CN
Inventors: 吴作敏
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-02-24
Filing date: 2021-02-10
Publication date: 2024-07-30
Anticipated expiration: 2041-02-10
Also published as: WO2021169821A1; CN114747278A

Abstract

The embodiment of the application discloses a method for detecting a downlink control channel and a related device, wherein the method comprises the following steps: the terminal equipment switches the downlink active bandwidth part BWP in the first cell from the first BWP to the second BWP; and the terminal equipment determines the Physical Downlink Control Channel (PDCCH) detection behavior of the second BWP according to the first cell. The embodiment of the application can effectively prescribe the PDCCH detection behavior of the terminal equipment in the BWP switching process.

Description

Method and related device for detecting downlink control channel

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting a downlink control channel.

Background

Currently, in a protocol of a New Radio (NR) system, if a terminal device performs a downlink DL Bandwidth Part (BWP) handover on a cell, how to specify a detection behavior of a physical downlink control channel (Physical Downlink Control Channel, PDCCH) of the terminal device is not yet concluded.

Disclosure of Invention

The embodiment of the application provides a method and a related device for detecting a downlink control channel, which can effectively prescribe PDCCH detection behaviors of terminal equipment in a BWP switching process.

In a first aspect, an embodiment of the present application provides a method for detecting a downlink control channel, including:

The terminal equipment determines that the downlink active bandwidth part BWP in the first cell is switched from the first BWP to the second BWP;

The terminal device detects a physical downlink control channel, PDCCH, on the second BWP according to a first set of search spaces, SSS, configured on the second BWP.

In a second aspect, an embodiment of the present application provides a method for detecting a downlink control channel, including:

The network device configures the terminal device with a first set of search spaces SSS on a second bandwidth portion BWP, the second BWP being a BWP to which the downlink active BWP in the first cell determined by the terminal device is switched by the first BWP, the first SSS being for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.

In a third aspect, an embodiment of the present application provides a device for detecting a downlink control channel, which is applied to a terminal device, where the device includes a processing unit and a communication unit, where the processing unit is configured to: determining that a downlink active bandwidth portion BWP in a first cell is switched from the first BWP to a second BWP; and detecting, by the communication unit, a physical downlink control channel PDCCH on the second BWP according to a first set of search spaces SSS configured on the second BWP.

In a fourth aspect, an embodiment of the present application provides a device for detecting a downlink control channel, which is applied to a network device, where the device includes a processing unit and a communication unit, where the processing unit is configured to: and configuring, by the communication unit, a first set of search spaces SSS on a second bandwidth portion BWP to a terminal device, the second BWP being a BWP to which the first BWP is switched for downlink activation in a first cell determined by the terminal device, the first SSS being for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.

In a fifth aspect, an embodiment of the present application provides a terminal device, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps in any of the methods of the first aspect of the embodiments of the present application.

In a sixth aspect, an embodiment of the present application provides a network device comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured for execution by the processor, the programs comprising instructions for performing the steps in any of the methods of the second aspect of the embodiments of the present application.

In a seventh aspect, an embodiment of the present application provides a chip, including: a processor for calling and running a computer program from a memory, so that a device on which the chip is mounted performs some or all of the steps as described in any of the methods of the first or second aspects of the embodiments of the application.

In an eighth aspect, embodiments of the present application provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a computer to perform part or all of the steps as described in any of the methods of the first or second aspects of the embodiments of the present application.

In a ninth aspect, embodiments of the present application provide a computer program, wherein the computer program is operable to cause a computer to perform some or all of the steps described in any of the methods of the first or second aspects of the embodiments of the present application. The computer program may be a software installation package.

It can be seen that, in the embodiment of the present application, the terminal device first determines that the downlink active bandwidth portion BWP in the first cell is switched from the first BWP to the second BWP; second, the physical downlink control channel PDCCH on the second BWP is detected from the first set of search spaces SSS configured on the second BWP. It can be seen that the PDCCH detection behavior on the active BWP is implemented through the SSS configured on the current active BWP, and the PDCCH detection behavior of the terminal device during the BWP handover can be effectively normalized.

Drawings

The drawings that accompany the embodiments or the prior art description can be briefly described as follows.

FIG. 1A is a system architecture diagram of an exemplary communication system provided in an embodiment of the present application;

fig. 1B is a schematic diagram of a terminal device according to an embodiment of the present application to continue PDCCH detection in group 0;

Fig. 1C is a schematic diagram of switching a terminal device to PDCCH detection in group 0 according to an embodiment of the present application;

fig. 1D is a schematic diagram of switching a terminal device to PDCCH detection in SSS group 1 according to an embodiment of the present application;

Fig. 1E is a schematic diagram of a terminal device according to an embodiment of the present application continuing PDCCH detection in SSS group 1;

fig. 1F is a schematic diagram of PDCCH detection after a slot end position with expired timer according to an embodiment of the present application;

fig. 1G is a schematic diagram of PDCCH detection performed after a COT length end position according to an embodiment of the present application;

FIG. 1H is a schematic diagram of determining a handover of an SSS set according to whether DCI is detected in SSS set 0, provided by an embodiment of the present application;

fig. 1I is a schematic diagram of PDCCH detection performed after a slot end position in which a timer expires according to an embodiment of the present application;

fig. 1J is a schematic diagram of PDCCH detection performed after a position of end of a COT length according to an embodiment of the present application;

Fig. 2A is a schematic flow chart of a method for detecting a downlink control channel according to an embodiment of the present application;

Fig. 2B is a flow chart of another method for detecting a downlink control channel according to an embodiment of the present application;

Fig. 3 is a functional unit composition block diagram of a downlink control channel detection device according to an embodiment of the present application;

Fig. 4 is a functional unit block diagram of another downlink control channel detection apparatus according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical scheme in the embodiment of the application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the present application may be applied to an example communication system 100 as shown in fig. 1A, where the example communication system 100 includes a terminal device 110 and a network device 120, and the terminal device 110 is communicatively connected to the network device 120.

The example communication system 100 may be, for example: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general Packet Radio Service (GPRS), long term evolution (Long Term Evolution, LTE) system, long term evolution advanced (Advanced long term evolution, LTE-a) system, new Radio (NR) system, evolution system of NR system, LTE-based access to unlicensed spectrum on unlicensed spectrum, NR-based access tounlicensed spectrum on unlicensed spectrum, NR-U system, universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (WIRELESS FIDELITY, WIFI), next generation communication system or other communication system, etc.

Generally, the number of connections supported by the conventional Communication system is limited and easy to implement, however, as the Communication technology advances, the mobile Communication system will support not only conventional Communication but also, for example, device-to-Device (D2D) Communication, machine-to-machine (Machine to Machine, M2M) Communication, machine type Communication (MACHINE TYPE Communication, MTC), inter-vehicle (Vehicle to Vehicle, V2V) Communication, and the like, and the embodiments of the present application can also be applied to these Communication systems. Optionally, the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or an independent (Standalone, SA) networking scenario.

The frequency spectrum of the application of the embodiment of the application is not limited. For example, the embodiment of the application can be applied to licensed spectrum and unlicensed spectrum.

The terminal device 110 in the embodiment of the present application may refer to a user device, an access terminal device, a user unit, a user station, a mobile station, a remote terminal device, a mobile device, a user terminal device, a wireless communication device, a user agent, or a user apparatus. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal DIGITAL ASSISTANT, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a relay device, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc., as embodiments of the present application are not limited in this respect.

The network device 120 in the embodiment of the present application may be a device for communicating with a terminal device, where the network device may be an evolved node b (evoled NodeB, eNB or eNodeB) in an LTE system, may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, or the network device may be a relay device, an access point, an on-board device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, where one or a group (including multiple antenna panels) of base stations in the 5G system antenna panels, or may also be a network node that forms a gNB or a transmission point, such as a baseband unit (BBU), or a Distributed Unit (DU), or the like, where the embodiment of the present application is not limited.

In some deployments, the gNB may include a centralized unit (centralized unit, CU) and DUs. The gNB may also include an active antenna unit (ACTIVE ANTENNA units, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (PACKET DATA convergence protocol, PDCP) layer. The DU is responsible for handling physical layer protocols and real-time services, and implements functions of a radio link control (radio link control, RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may be eventually changed into or converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which the present application is not limited to.

In an embodiment of the present application, the terminal device 110 or the network device 120 includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided by the embodiment of the present application, as long as communication can be performed in the method provided according to the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, and for example, the execution body of the method provided by the embodiment of the present application may be a terminal device or a functional module in the terminal device capable of calling the program and executing the program.

Some concepts related to the embodiments of the present application are as follows:

1. unlicensed spectrum

Unlicensed spectrum is a nationally and regionally divided spectrum that can be used for radio communications and is generally considered to be a shared spectrum, i.e., communication devices in different communication systems can use the spectrum as long as the regulatory requirements set by the country or region on the spectrum are met, without requiring a proprietary spectrum grant to be applied to the government. In order for individual communication systems using unlicensed spectrum for wireless communication to co-exist friendly over that spectrum, some countries or regions specify regulatory requirements that must be met using unlicensed spectrum. For example, in some regions, the communication device follows the "Listen-Before-Talk (LBT)" principle, that is, the communication device needs to perform channel interception Before performing signal transmission on a channel of an unlicensed spectrum, and only when the channel interception result is that the channel is idle, the communication device can perform signal transmission; if the channel listening result of the communication device on the channel of the unlicensed spectrum is that the channel is busy, the communication device is unable to signal. In order to ensure fairness, the communication device cannot use the unlicensed spectrum channel for signal transmission for a period exceeding the maximum channel occupation time (Maximum Channel Occupation Time, MCOT) in one transmission.

2. Search space set configuration and handoff

In an NR unlicensed spectrum (New Radio in Unlicensed Spectrum, NR-U) system, a terminal device may be configured with at most two search space set groups (SEARCH SPACE SETS groups, SSS groups) on one BWP for detecting PDCCH. In the case where two search space set groups are configured, the terminal device only needs to detect the PDCCH in one SSS group for a period of time. The terminal device supports a switch from detecting a PDCCH in group 0 (also referred to as a first group) to detecting a PDCCH in group 1 (also referred to as a second group), or from detecting a PDCCH in group 1 to detecting a PDCCH in group 0.

Currently, switching of SSS groups includes two approaches:

(1) Explicit handover

① The terminal device is configured with Flag in DCI 2-0 for indicating SSS group handover

The terminal device is configured in DCI 2-0 with a detection group indication Flag for indicating SSS group handover.

For a serving cell, the terminal device may be configured to detect a group indication Flag corresponding to the serving cell.

② The terminal device performs switching of the SSS group according to the detected Flag indication

If the terminal device does not receive DCI 2-0, the terminal device performs PDCCH detection in SSS group 0.

If the terminal equipment receives the Flag indication 0, the terminal equipment performs PDCCH detection in the SSS group 0, which specifically comprises:

● As shown in fig. 1B, if the terminal device previously performed PDCCH detection in SSS group 0, the terminal device continues PDCCH detection in group 0.

● As shown in fig. 1C, if the terminal device previously performed PDCCH detection in group 1, the terminal device switches to performing PDCCH detection in group 0.

If the terminal device receives Flag indication 1, the terminal device performs PDCCH detection in SSS group 1 and starts a timer.

● As shown in fig. 1D, if the terminal device previously performed PDCCH detection in SSS group 0, the terminal device switches to performing PDCCH detection in SSS group 1.

● As shown in fig. 1E, if the terminal device previously performed PDCCH detection in SSS group 1, the terminal device continues PDCCH detection in SSS group 1.

● The terminal device switches from PDCCH detection in SSS group 1 to PDCCH detection in SSS group 0 when one of the following conditions is satisfied:

As shown in fig. 1F, PDCCH detection is performed after the slot end position where the timer expires;

As shown in fig. 1G, PDCCH detection is performed after receiving the instructed COT length end position.

It should be appreciated that there is some delay in the SSS group switching, as indicated by the P1 symbol in fig. 1B-1G. Optionally, the SSS group switch starts from the next slot after the satisfaction time delay.

(2) Implicit handoff

① The terminal device determines whether to switch to group 1 according to whether DCI is detected in SSS group 0.

② The terminal device is not configured with DCI 2-0 or the detection group indication Flag for indicating SSS group switching is not included in DCI 2-0 where the terminal device is configured.

③ The terminal device determines the handover of the SSS group according to whether DCI is detected in the SSS group 0, as shown in fig. 1H,

If the terminal device detects DCI in SSS group 0, the terminal device switches to PDCCH detection in SSS group 1.

If the terminal device detects DCI (not limited to SSS group 0), the terminal device starts a timer.

If the terminal device performs PDCCH detection in SSS group 1, the terminal device switches to PDCCH detection in SSS group 0 when one of the following conditions is satisfied.

● As shown in fig. 1I, PDCCH detection is performed after the slot end position where the timer expires;

● As shown in fig. 1J, if the instructed COT length end position is received, PDCCH detection is performed.

It should be appreciated that there is some delay in the SSS group switching, as indicated by the P2 symbol in fig. 1H-1J. Optionally, the SSS group switch starts from the next slot after the satisfaction time delay.

BWP switching scheme in NR

The concept of BWP is defined in NR, including downstream BWP and upstream BWP. On one serving cell, the UE may be configured with up to 4 downlink BWP and 4 uplink BWP. The SSS group may be configured on at least one downlink BWP among the 4 downlink BWPs.

Currently, the UE can only activate one downlink BWP at most, and one uplink BWP at most. The UE may switch the activated BWP based on the signaling indication or a predefined rule. The method comprises the following steps:

● Based on the indication of the DCI, the UE may switch downlink and/or uplink BWP; for example, currently activating downlink BWP index=1, receiving the DCI indication may indicate that the activated BWP is switched from 1 to 2, i.e. bwp#1 is deactivated, and bwp#2 is activated

● Indication based on RRC signaling

● Based on the configured timer, for example, the UE may switch to a default or initial BWP when the timer expires

● Event based

For example, when the current activated uplink BWP has no RACH resource, the UE may switch from the current activated BWP to the initial BWP to perform the RACH procedure when triggering the RACH procedure;

For example, if a persistent UL LBT failure occurs on SpCell, the UE may switch to initiate RACH on any uplink BWP configured with RACH resources.

In the current NR protocol, if a DL BWP handover occurs on a first cell by a terminal device, e.g. an active BWP handover from a first BWP to a second BWP, how to specify the PDCCH detection behaviour of the terminal device has not yet been concluded.

Aiming at the problems, the application provides the following technical ideas for the scene of switching the downlink activated BWP in the first cell from the first BWP to the second BWP: the PDCCH detection behavior of the terminal device includes at least one of the following.

● If the second BWP is not configured with the SSS group, the terminal device performs PDCCH detection according to the configured SSS.

● If the second BWP is configured with one SSS group.

The terminal equipment performs PDCCH detection according to the configured SSS group; or (b)

And the terminal equipment performs PDCCH detection according to the configured first SSS, wherein the first SSS comprises SSS which do not belong to the SSS group.

● If the second BWP is configured with two SSS groups, the act of the terminal device performing PDCCH detection includes one of:

and the terminal equipment performs PDCCH detection according to the configured first SSS.

■ The first SSS includes SSSs configured to belong to SSS group 0 and SSS group 1 simultaneously; and/or the number of the groups of groups,

■ The first SSS includes SSSs that neither belong to group 0 nor group 1.

And the terminal equipment performs PDCCH detection according to the preset SSS group.

■ The preset SSS group is group 0

If the terminal device receives an indication of an identification Flag (e.g. first handover indication information) of the first cell, the terminal device performs PDCCH detection on the second BWP according to the Flag indication in mode 1 (explicit handover mode described above).

■ Further, if the Flag of the first cell is not received, the terminal device performs PDCCH detection according to a preset SSS group, for example, group 0.

The terminal device performs PDCCH detection on the second BWP according to the SSS group to be detected determined in the first cell group (e.g., in case 1 above).

■ The first cell belongs to a first cell group, the PDCCH detection behavior in the first cell group is determined according to the second cell, and the first cell and the second cell are different cells.

■ In addition, if the first cell and the second cell are the same cell, the PDCCH detection behavior in the first cell group is determined according to the third cell; or, the PDCCH detection behavior in the first cell group is determined according to the PDCCH detection behavior of the first cell on the second BWP.

The terminal device agrees with the PDCCH detection behavior before and after the BWP switch occurs.

■ If the terminal device performs PDCCH detection in SSS group 0 on the first BWP, the terminal device continues PDCCH detection in SSS group 0 after switching to the second BWP.

■ If the terminal device performs PDCCH detection in SSS group 1 on the first BWP, the terminal device continues PDCCH detection in SSS group 1 after switching to the second BWP.

If the terminal device performs PDCCH detection in SSS group 0 on the first BWP, the terminal device continues PDCCH detection in SSS group 0 after switching to the second BWP

If the terminal device performs PDCCH detection in SSS group 1 on the first BWP, after switching to the second BWP, the terminal device performs PDCCH detection in SSS group 0 after the following condition is satisfied

■ The time when the terminal equipment starts to detect on the second BWP is positioned at the end position of the time slot when the timer expires; or (b)

■ The time at which the terminal device starts detection on the second BWP is located after the end position of the COT length at which the indication was received.

Optionally, since the SSS group needs a certain delay, the BWP switch delay is included in the active BWP switch scenario.

The following describes the design concept in detail with reference to the drawings. Referring to fig. 2A, fig. 2A is a flow chart of a method for detecting a downlink control channel according to an embodiment of the present application, as shown in the drawings, the method includes:

Step 2a01, the terminal equipment determines that the downlink active bandwidth part BWP in the first cell is switched from the first BWP to the second BWP;

In step 2a02, the network device configures the terminal device with a first set of search spaces SSS on a second bandwidth part BWP, the second BWP being a BWP to which the first BWP is switched for downlink active BWP in a first cell determined by the terminal device, the first SSS being used by the terminal device to detect a physical downlink control channel PDCCH on the second BWP.

Step 2a03, the terminal device detects a physical downlink control channel PDCCH on the second BWP according to the configured first search space set SSS on the second BWP.

In one possible example, the set of search spaces SSSs on the second BWP are not configured, and the first SSS includes at least one SSS configured on the second BWP.

In one possible example, a single SSS group is configured on the second BWP, and the first SSS includes at least one SSS in the single SSS group.

In one possible example, a single SSS group is configured on the second BWP, the first SSS includes at least one SSS configured on the second BWP, and the first SSS does not include SSSs belonging to the single SSS group.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the first SSS including at least one SSS of the second SSSs, wherein,

The second SSS includes SSSs belonging to both the SSS group 0 and the SSS group 1, and the second SSS includes SSSs belonging to neither the SSS group 0 nor the SSS group 1.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the first SSS including at least one SSS of a first SSS group, wherein the first SSS group is preset or configured by a network device, and the first SSS group is the SSS group 0 or the SSS group 1.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the terminal device is configured with first handover indication information of the first cell, wherein,

If the first switching indication information takes a value of 0, the first SSS includes at least one SSS in the SSS group 0; or alternatively, the first and second heat exchangers may be,

If the first switching indication information takes a value of 1, the first SSS includes at least one SSS in the SSS group 1.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the first SSS including at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, the first SSS group is the SSS group 0 or the SSS group 1,

Wherein the terminal device is not configured with the first handover indication information of the first cell, or the terminal device does not receive the first handover indication information of the first cell.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the first cell belongs to the first cell group, the first SSS includes at least one SSS of a first SSS group, wherein the first SSB group is determined according to an identification of the SSS group detected by the terminal device on a second cell of the first cell group.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the first BWP is not configured with SSS group or is configured with a single SSB group, and the first SSS includes at least one SSS in a first SSS group, where the first SSS group is preset or configured by a network device, and the first SSS group is the SSS group 0 or the SSS group 1.

In one possible example, the first SSS group is SSS group 0.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, and the first BWP is configured with SSS group 0 and SSB group 1, wherein,

If the terminal device detects a PDCCH according to SSS group 0 on the first BWP before BWP handover, the first SSS includes at least one SSS of the SSS group 0 after BWP handover; or alternatively, the first and second heat exchangers may be,

If the terminal device detects a PDCCH according to SSS group 1 on the first BWP before BWP handover, the first SSS includes at least one SSS of the SSS group 1 after BWP handover.

If the terminal device detects a PDCCH according to SSS group 1 on the first BWP before BWP handover and the time when the terminal device starts detection on the second BWP is located after a first duration, the first SSS includes at least one SSS of the SSS group 0.

In one possible example, the first time period is determined according to a time period during which the terminal device detects a PDCCH according to the SSS group 1 on the first BWP.

It can be seen that in this embodiment, the terminal device first determines that the downlink active bandwidth portion BWP in the first cell is switched from the first BWP to the second BWP; second, the physical downlink control channel PDCCH on the second BWP is detected from the first set of search spaces SSS configured on the second BWP. It can be seen that the PDCCH detection behavior on the active BWP is implemented through the SSS configured on the current active BWP, and the PDCCH detection behavior of the terminal device during the BWP handover can be effectively normalized.

In the above solution, the terminal device may be configured with a set of serving cells or a set of cells, for example, a first set of cells, where the first set of cells includes at least one cell, and where the at least one cell includes the first cell. For each BWP in each cell in the first cell group, the terminal device may be configured with at most two SSS groups.

Alternatively, one SSS may be configured to belong to both SSS group 0 and SSS group 1.

Alternatively, for configured SSSs that do not belong to group 0 nor group 1, the terminal device always needs PDCCH detection in the SSS.

Optionally, the switching of the SSS group includes at least one of the following two cases, as shown below, where the switching of the SSS group by the terminal device according to case 1 or case 2 may be preset, or configured by the network device.

As an example, the terminal device may determine, according to the configuration signaling of the network device, that the handover of the SSS group should be performed according to case 1 or case 2. For example, at least one cell in the first cell group is configured to indicate a detection group indication Flag for SSS group handover, and if the Flag corresponding to all cells in the at least one cell indicates the same value, the terminal device performs the SSS group handover according to case 1. For another example, at least two cells in the first cell group are configured to instruct the detection group indication Flag of the SSS group handover, and if the Flag corresponding to at least two cells in the at least two cells indicates a different value, the terminal device performs the handover of the SSS group according to case 2. For another example, the network device instructs the terminal device to switch SSS groups according to case 1 or case 2 through the configuration signaling.

As an example, the terminal device only supports switching of SSS groups according to case 1, or the terminal device only supports switching of SSS groups according to case 2.

Optionally, the terminal device reports to the network device whether the handover of the SSS group is supported according to case 1 or case 2.

● Case 1: the PDCCH detection behavior of the terminal device is determined per cell group, or the PDCCH detection behavior on active BWP of the terminal device is consistent for all cells in one cell group.

● Case 2: the PDCCH detection behaviour of the terminal device is cell-wise determined or the terminal device is independent on the active BWP of each cell in a group of cells.

For the above case 1, the embodiment of the present application further provides a flowchart of another method for detecting a downlink control channel, as shown in fig. 2B, where the method includes:

step 2B01, the terminal equipment determines a first cell group to which the first cell belongs.

Step 2B02, the terminal device determines a PDCCH detection behaviour on an active BWP in the first cell group.

In a specific implementation, the determining manner of the PDCCH detection behavior on the activated BWP in the first cell group includes at least one of the following:

First, if at least one cell in the first cell group is configured in downlink control information DCI 2-0 to indicate a detection group indication Flag for SSS group handover and the Flag corresponding to the at least one cell indicates the same value, the terminal device determines, according to the indication of the Flag, PDCCH detection behavior on activated BWP in the first cell group according to an SSS group handover rule in an SSS group explicit handover manner (i.e., the foregoing explicit handover manner).

Second, if at least two cells in the first cell group are configured in DCI 2-0 to indicate a detection group indication Flag for SSS group handover and the Flag corresponding to at least two cells in the at least two cells indicates different values, the terminal device determines PDCCH detection behavior on active BWP in the first cell group according to the indication of Flag of the second cell in the at least two cells through SSS group handover rule in mode 1.

Optionally, if the at least two cells include a primary cell Pcell, the second cell is the Pcell; or if the at least two cells include a primary secondary cell PScell, the second cell is the Pscell; or if the at least two cells include a special cell sPCell, the second cell is the sPCell.

Optionally, if the at least two cells do not include Pcell, pscell and sPCell, the second cell is a cell with the smallest cell index or a cell with the largest cell index or a cell configured by a preset cell or network equipment.

Third, if no cell in the first cell group is configured in DCI 2-0 to indicate a detection group indication Flag for SSS group handover, the terminal device determines, according to the second cell in the first cell group, a PDCCH detection behavior on activated BWP in the first cell group through an SSS group handover rule in preset SSS group implicit handover (i.e., the implicit handover method described above).

Optionally, the second cell is any one cell in the first cell group.

Fourth, the terminal device determines the PDCCH detection behavior on the active BWP in the first cell group according to the SSS group explicit switching method or the SSS group switching rule in the SSS group implicit switching method by the second cell in the first cell group.

Optionally, if the second cell is configured in DCI 2-0 to indicate a detection group indication Flag for SSS group handover, the terminal device determines, according to the SSS group handover rule in mode 1, a PDCCH detection behavior on an active BWP in the first cell group; or (b)

Optionally, if the second cell has no detection group indication Flag in DCI 2-0 configured to indicate SSS group handover, the terminal device determines, according to the SSS group handover rule in mode 2, a PDCCH detection behaviour on activated BWP in the first cell group.

Accordingly, the first cell group includes a first cell, and the PDCCH detection behavior of the terminal device on the active BWP in the first cell group is the same as the PDCCH detection behavior on the active BWP in the first cell group.

It can be seen that in this example, the terminal device can activate the PDCCH detection behaviour on BWP in a cell group determination manner, i.e. the PDCCH detection behaviour on the activated BWP of the terminal device on all cells in one cell group is consistent, so that the PDCCH detection behaviour of the terminal device is effectively normalized after the RRC configuration is validated or during BWP handover.

The scheme of the embodiment of the application is mainly introduced from the aspect of interaction among the network elements at the method side. It will be appreciated that the terminal device and the network device, in order to implement the above-mentioned functions, comprise corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional units of the terminal equipment and the network equipment according to the method example, for example, each functional unit can be divided corresponding to each function, and two or more functions can be integrated in one processing unit. The integrated units described above may be implemented either in hardware or in software program modules. It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice.

In case of using integrated units, fig. 3 shows a functional unit block diagram of a detection device for a downlink control channel. The downlink control channel detection apparatus 300 is applied to a terminal device, and specifically includes: a processing unit 302 and a communication unit 303. The processing unit 302 is used for controlling and managing the actions of the terminal device, e.g. the processing unit 302 is used for supporting the terminal device to perform steps 202-204 in fig. 2A and other processes for the techniques described herein. The communication unit 303 is used to support communication of the terminal device with other devices. The terminal device may further comprise a storage unit 301 for storing program code and data of the terminal device.

The processing unit 302 may be a Processor or controller, such as a central processing unit (Central Processing Unit, CPU), a general purpose Processor, a digital signal Processor (DIGITAL SIGNAL Processor, DSP), an Application-specific integrated Circuit (ASIC), a field programmable gate array (Field Programmable GATE ARRAY, FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication unit 303 may be a communication interface, a transceiver, a transceiving circuit, etc., and the storage unit 301 may be a memory. When the processing unit 302 is a processor, the communication unit 303 is a communication interface, and the storage unit 301 is a memory, the terminal device according to the embodiment of the present application may be a terminal device shown in fig. 3.

In particular implementation, the processing unit 302 is configured to perform any step performed by the terminal device in the above method embodiment, and when performing data transmission such as sending, the communication unit 303 is optionally invoked to complete a corresponding operation. The following is a detailed description.

The processing unit 302 is configured to: determining that a downlink active bandwidth portion BWP in a first cell is switched from the first BWP to a second BWP; and detecting, by the communication unit, a physical downlink control channel PDCCH on the second BWP according to a first set of search spaces SSS configured on the second BWP.

In one possible example, the first SSS group is SSS group 0.

In case of using integrated units, fig. 4 shows a functional unit block diagram of another downstream control channel detection device. The downlink control channel detection apparatus 400 is applied to a network device, where the network device includes: a processing unit 402 and a communication unit 403. The processing unit 402 is configured to control and manage actions of the network device, e.g., the processing unit 502 is configured to support the network device to perform steps 201, 205 in fig. 2A and/or other processes for the techniques described herein. The communication unit 403 is used to support communication of the network device with other devices. The network device may further comprise a storage unit 401 for storing program code and data of the terminal device.

The processing unit 402 may be a Processor or controller, such as a central processing unit (Central Processing Unit, CPU), a general purpose Processor, a digital signal Processor (DIGITAL SIGNAL Processor, DSP), an Application-specific integrated Circuit (ASIC), a field programmable gate array (Field Programmable GATE ARRAY, FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication unit 403 may be a communication interface, a transceiver circuit, or the like, and the storage unit 401 may be a memory. When the processing unit 402 is a processor, the communication unit 403 is a communication interface, and the storage unit 401 is a memory, the terminal device according to the embodiment of the present application may be a network device shown in fig. 4.

The processing unit 402 is configured to: and configuring, by the communication unit, a first set of search spaces SSS on a second bandwidth portion BWP to a terminal device, the second BWP being a BWP to which the first BWP is switched for downlink activation in a first cell determined by the terminal device, the first SSS being for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.

In one possible example, the second BWP is configured with SSS group 0 and SSS group 1, the network device configures first handover indication information of the first cell to a terminal device, wherein,

In one possible example, the first SSS group is SSS group 0.

It can be understood that, since the method embodiment and the apparatus embodiment are different presentation forms of the same technical concept, the content of the method embodiment portion in the present application should be synchronously adapted to the apparatus embodiment portion, which is not described herein.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a terminal device 500 according to an embodiment of the present application, and as shown in fig. 5, the terminal device 500 includes a processor 510, a memory 520, a communication interface 530, and at least one communication bus for connecting the processor 510, the memory 520, and the communication interface 530.

Memory 520 includes, but is not limited to, random access memory (random access memory, RAM), read-only memory (ROM), erasable programmable read-only memory (erasable programmable read only memory, EPROM), or portable read-only memory (compact disc read-only memory, CD-ROM), with memory 520 for associated instructions and data.

The communication interface 530 is used to receive and transmit data.

Processor 510 may be one or more central processing units (central processing unit, CPU), which may be a single-core CPU or a multi-core CPU in the case where processor 510 is a single CPU.

The processor 510 in the terminal device 500 is configured to read one or more program codes 521 stored in the memory 520, and perform the following operations: determining that a downlink active bandwidth portion BWP in a first cell is switched from the first BWP to a second BWP; ; and invoking the communication interface 530 to detect a physical downlink control channel PDCCH on the second BWP according to the configured first set of search spaces SSS on the second BWP. .

It should be noted that the implementation of the respective operations may also correspond to the corresponding description of the method embodiment shown in fig. 2A, and the terminal device 500 may be used to perform the method on the terminal device side of the foregoing method embodiment of the present application.

In the terminal device 500 depicted in fig. 5, the PDCCH detection behavior on the active BWP is implemented by the SSS configured on the currently active BWP, and the PDCCH detection behavior of the terminal device during BWP handover can be effectively normalized.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a network device 600 according to an embodiment of the present application, as shown in fig. 6, the network device 600 includes a processor 610, a memory 620, a communication interface 630, and at least one communication bus for connecting the processor 610, the memory 620, and the communication interface 630.

Memory 620 includes, but is not limited to, random access memory (random access memory, RAM), read-only memory (ROM), erasable programmable read-only memory (erasable programmable read only memory, EPROM), or portable read-only memory (compact disc read-only memory, CD-ROM), with memory 620 for associated instructions and data.

The communication interface 630 is used to receive and transmit data.

The processor 610 may be one or more central processing units (central processing unit, CPU), and in the case where the processor 610 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

The processor 610 in the terminal device 600 is configured to read one or more program codes 621 stored in the memory 620, and perform the following operations: the communication interface 630 is invoked to configure the terminal device with a first set of search spaces SSS on a second bandwidth part BWP, the second BWP being a BWP to which the first BWP is switched for downlink active BWP in a first cell determined by the terminal device, the first SSS being used for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.

It should be noted that the implementation of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 2A, and the network device 600 may be used to perform the method on the network device side of the foregoing method embodiment of the present application.

In the network device 600 depicted in fig. 6, the PDCCH detection behavior on the active BWP is implemented by the SSS configured on the currently active BWP, and the PDCCH detection behavior of the terminal device during the BWP handover can be effectively normalized.

The embodiment of the application also provides a chip, wherein the chip comprises a processor, and the processor is used for calling and running the computer program from the memory, so that the device provided with the chip executes part or all of the steps described by the terminal device in the embodiment of the method.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program for electronic data exchange, and the computer program causes a computer to execute part or all of the steps described by the terminal device in the embodiment of the method.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program for electronic data exchange, and the computer program makes a computer execute part or all of the steps described by the network side device in the embodiment of the method.

Embodiments of the present application also provide a computer program product, wherein the computer program product comprises a computer program operable to cause a computer to perform some or all of the steps described by the terminal device in the above method embodiments. The computer program product may be a software installation package.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, or may be embodied in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access Memory (Random Access Memory, RAM), flash Memory, read Only Memory (ROM), erasable programmable Read Only Memory (Erasable Programmable ROM), electrically Erasable Programmable Read Only Memory (EEPROM), registers, hard disk, a removable disk, a compact disk Read Only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in an access network device, a target network device, or a core network device. It is of course also possible that the processor and the storage medium reside as discrete components in an access network device, a target network device, or a core network device.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented, in whole or in part, in software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital video disc (Digital Video Disc, DVD)), or a semiconductor medium (e.g., solid state disk (Solid STATE DISK, SSD)), etc.

The foregoing detailed description of the embodiments of the present application further illustrates the purposes, technical solutions and advantageous effects of the embodiments of the present application, and it should be understood that the foregoing description is only a specific implementation of the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. The method for detecting the downlink control channel is characterized by comprising the following steps:

The terminal equipment detects a Physical Downlink Control Channel (PDCCH) on the second BWP according to a first Search Space Set (SSS) configured on the second BWP;

Wherein the set of search space SSSs on the second BWP are not configured, the first SSS comprising at least one SSS configured on the second BWP; or alternatively

A single SSS group is configured on the second BWP, the first SSS includes at least one SSS of the single SSS group, or the first SSS includes at least one SSS configured on the second BWP and does not include SSSs belonging to the single SSS group; or alternatively

The second BWP is configured with SSS group 0 and SSS group 1, the first SSS includes at least one SSS of SSS group 0 or SSS group 1, or the first SSS includes SSSs that do not belong to either SSS group 0 or SSS group 1.

2. The method of claim 1, wherein the first SSS comprises at least one SSS of a second SSS when the second BWP is configured with SSS group 0 and SSS group 1, wherein,

3. The method according to claim 1 or 2, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, the first SSS group being either the SSS group 0 or the SSS group 1.

4. The method according to claim 1, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the terminal device is configured with first handover indication information of the first cell, wherein,

5. The method of claim 1 or 4, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, wherein the first SSS group is either the SSS group 0 or the SSS group 1,

6. The method according to claim 1, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first cell belongs to the first cell group, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is determined from an identification of the SSS group detected by the terminal device on a second cell of the first cell group.

7. The method of claim 1, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when no SSS group or a single SSS group is configured on the first BWP, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, and wherein the first SSS group is the SSS group 0 or the SSS group 1.

8. The method of any one of claims 3,5, 7, wherein the first SSS group is SSS group 0.

9. The method of claim 1, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

10. The method of claim 1, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

11. The method of claim 10, wherein the first time period is determined according to a time period during which the terminal device detects a PDCCH on the first BWP according to the SSS group 1.

12. The method for detecting the downlink control channel is characterized by comprising the following steps:

The network device configures a first set of search spaces SSS on a second bandwidth portion BWP to the terminal device, the second BWP being a BWP to which a downlink active BWP in a first cell determined by the terminal device is switched by a first BWP, the first SSS being used by the terminal device to detect a physical downlink control channel PDCCH on the second BWP;

13. The method of claim 12, wherein the first SSS comprises at least one SSS of a second SSS when the second BWP is configured with SSS group 0 and SSS group 1, wherein,

14. The method according to claim 12 or 13, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, the first SSS group being either the SSS group 0 or the SSS group 1.

15. The method according to claim 12, wherein the network device configures first handover indication information of the first cell to a terminal device when the second BWP is configured with SSS group 0 and SSS group 1, wherein,

16. The method according to claim 12 or 15, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, the first SSS group is the SSS group 0 or the SSS group 1,

17. The method of claim 12, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first cell belongs to the first cell group, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is determined from an identification of the SSS group detected by the terminal device on a second cell of the first cell group.

18. The method of claim 12, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when no SSS group or a single SSS group is configured on the first BWP, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, and wherein the first SSS group is the SSS group 0 or the SSS group 1.

19. The method of any one of claims 14, 16, 18, wherein the first SSS group is SSS group 0.

20. The method of claim 12, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

21. The method of claim 12, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

22. The method of claim 21, wherein the first time period is determined according to a time period during which the terminal device detects a PDCCH on the first BWP according to the SSS group 1.

23. A downlink control channel detection device, which is applied to a terminal device, and comprises a processing unit and a communication unit, wherein the processing unit is used for: determining that a downlink active bandwidth portion BWP in a first cell is switched from the first BWP to a second BWP; and detecting, by the communication unit, a physical downlink control channel, PDCCH, on the second BWP according to a first set of search spaces, SSS, configured on the second BWP;

24. The apparatus of claim 23, wherein the first SSS comprises at least one SSS of a second SSS when the second BWP is configured with SSS group 0 and SSS group 1, wherein,

25. The apparatus of claim 23 or 24, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, and wherein the first SSS group is either SSS group 0 or SSS group 1.

26. The apparatus of claim 23, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the terminal device is configured with first handover indication information of the first cell, wherein,

27. The apparatus of claim 23 or 26, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, wherein the first SSS group is either SSS group 0 or SSS group 1,

28. The apparatus of claim 23, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first cell belongs to the first cell group, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is determined based on an identification of the SSS group detected by the terminal device on a second cell of the first cell group.

29. The apparatus of claim 23, wherein when the second BWP is configured with SSS group 0 and SSS group 1 and when no SSS group or a single SSS group is configured on the first BWP, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, and wherein the first SSS group is either SSS group 0 or SSS group 1.

30. The apparatus of any one of claims 25, 27, 28, wherein the first SSS group is SSS group 0.

31. The apparatus of claim 23, wherein when the second BWP is configured with SSS group 0 and SSS group 1 and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

32. The apparatus of claim 23, wherein when the second BWP is configured with SSS group 0 and SSS group 1 and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

33. The apparatus of claim 32, wherein the first time period is determined according to a time period during which the terminal device detects a PDCCH on the first BWP according to the SSS group 1.

34. A downlink control channel detection device, which is applied to a network device, and comprises a processing unit and a communication unit, wherein the processing unit is used for: configuring, by the communication unit, a first set of search spaces SSS on a second bandwidth portion BWP to a terminal device, the second BWP being a BWP to which a first BWP is switched for downlink active BWP in a first cell determined by the terminal device, the first SSS being for the terminal device to detect a physical downlink control channel PDCCH on the second BWP;

35. The apparatus of claim 34, wherein the first SSS comprises at least one SSS of a second SSS when the second BWP is configured with SSS group 0 and SSS group 1, wherein,

36. The apparatus of claim 34 or 35, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, and wherein the first SSS group is either SSS group 0 or SSS group 1.

37. The apparatus of claim 34, wherein the network device configures first handover indication information of the first cell to a terminal device when the second BWP is configured with SSS group 0 and SSS group 1, wherein,

38. The apparatus of claim 34 or 37, wherein when the second BWP is configured with SSS group 0 and SSS group 1, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, wherein the first SSS group is either SSS group 0 or SSS group 1,

39. The apparatus of claim 34, wherein when the second BWP is configured with SSS group 0 and SSS group 1, and when the first cell belongs to the first cell group, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is determined based on an identification of the SSS group detected by the terminal device on a second cell of the first cell group.

40. The apparatus of claim 34, wherein when the second BWP is configured with SSS group 0 and SSS group 1 and when no SSS group or a single SSS group is configured on the first BWP, the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is preset or network device configured, the first SSS group being either the SSS group 0 or the SSS group 1.

41. The apparatus of any one of claims 36, 38, 40, wherein the first SSS group is SSS group 0.

42. The apparatus of claim 34, wherein when the second BWP is configured with SSS group 0 and SSS group 1 and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

43. The apparatus of claim 34, wherein when the second BWP is configured with SSS group 0 and SSS group 1 and when the first BWP is configured with SSS group 0 and SSS group 1, wherein,

44. The apparatus of claim 43, wherein the first time period is determined based on a time period during which the terminal device detects PDCCH on the first BWP based on the SSS group 1.

45. A terminal device comprising a processor, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs comprising instructions for performing the steps in the method of any of claims 1-11.

46. A network device comprising a processor, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs comprising instructions for performing the steps in the method of any of claims 12-22.

47. A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method of any of claims 1-11 or 12-22.

48. A computer-readable storage medium, characterized in that it stores a computer program for electronic data exchange, wherein the computer program causes a computer to perform the method according to any one of claims 1-11 or 12-22.