CN114747278A

CN114747278A - Method and related device for detecting downlink control channel

Info

Publication number: CN114747278A
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: 2022-07-12
Anticipated expiration: 2041-02-10
Also published as: WO2021169821A1

Abstract

The embodiment of the application discloses a method and a related device for detecting a downlink control channel, 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 a 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 specify the PDCCH detection behavior of the terminal equipment in the BWP handover 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 a related 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 in a cell, how to specify a detection behavior of a Physical Downlink Control Channel (PDCCH) of the terminal device does not have a conclusion.

Disclosure of Invention

The embodiment of the application provides a method and a related device for detecting a downlink control channel, which can effectively specify a PDCCH detection behavior of a terminal device in a BWP handover process.

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

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

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

a network device configures a first search space set SSS on a second bandwidth part BWP to a terminal device, the second BWP is determined by the terminal device, the downlink activation BWP in a first cell is switched to by the first BWP, and the first SSS is used 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 part (BWP) in a first cell is switched from a first BWP to a second BWP; and detecting, by the communication unit, a Physical Downlink Control Channel (PDCCH) on the second BWP according to the configured first Search Space Set (SSS) 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: configuring, by the communication unit, a first search space set SSS on a second bandwidth part BWP to a terminal device, where the second BWP is a BWP to which a downlink activation BWP in a first cell determined by the terminal device is switched by a first BWP, and the first SSS is used 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, and the program includes instructions for executing the steps in any of the methods of the first aspect of the embodiment of the present application.

In a sixth aspect, embodiments of the present application provide a network 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, and the program includes instructions for performing the steps of 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: 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 in the method of any one of the first aspect and the second aspect of the embodiment of the application.

In an eighth aspect, the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform part or all of the steps described in any one of the methods of the first aspect or the second aspect of the present application.

In a ninth aspect, embodiments of the present application provide a computer program, where the computer program is operable to cause a computer to perform some 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. The computer program may be a software installation package.

It can be seen that, in this embodiment of the present application, the terminal device first determines that the downlink active bandwidth part BWP in the first cell is switched from the first BWP to the second BWP; secondly, detecting a physical downlink control channel PDCCH on a second BWP according to a configured first search space set SSS on the second BWP. It can be seen that the PDCCH detection behavior on the active BWP is implemented by the SSS configured on the currently active BWP, which can effectively specify the PDCCH detection behavior of the terminal device during the BWP handover.

Drawings

Reference will now be made in brief to the drawings that are needed in describing embodiments or prior art.

Fig. 1A is a system architecture diagram of an example communication system provided by an embodiment of the present application;

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

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

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

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

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

fig. 1G is a schematic diagram of PDCCH detection after a COT length end position provided in the embodiment of the present application;

fig. 1H is a schematic diagram of determining a handover of an SSS group according to whether DCI is detected in the SSS group 0 according to an embodiment of the present application;

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

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

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

fig. 2B is a schematic flowchart of another method for detecting a downlink control channel according to an embodiment of the present application;

fig. 3 is a block diagram illustrating functional units of a device for detecting a downlink control channel according to an embodiment of the present disclosure;

fig. 4 is a block diagram illustrating functional units of another apparatus for detecting a downlink control channel 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 solutions in the embodiments of the present 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 the example communication system 100 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: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) System, an Advanced Long Term Evolution (LTE-A) System, a New Radio (NR) System, an evolution System of an NR System, an LTE (LTE-based to unlicensed spectrum, LTE-U) System on an unlicensed spectrum, an NR (NR-based to unlicensed spectrum, NR-U) System on an unlicensed spectrum, a Universal Mobile Telecommunications System (UMTS), a Wireless Local Area Network (WLAN), a Wireless Fidelity (WiFi), a next-generation communication System, other communication systems, and the like.

Generally, conventional Communication systems support a limited number of connections and are easy to implement, however, with the development of Communication technology, mobile Communication systems will support not only conventional Communication, but also, for example, Device-to-Device (D2D) Communication, Machine-to-Machine (M2M) Communication, Machine Type Communication (MTC), and Vehicle-to-Vehicle (V2V) Communication, etc., 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 (CA) scenario, may also be applied to a Dual Connectivity (DC) scenario, and may also be applied to an independent (SA) networking scenario.

The frequency spectrum of the application is not limited in the embodiment of the present application. For example, the embodiments of the present application may be applied to a licensed spectrum, and may also be applied to an unlicensed spectrum.

Terminal device 110 in the embodiments of the present application may refer to a user equipment, an access terminal device, a subscriber unit, a subscriber 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 equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with a wireless communication function, 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 (PLMN), and the like, which is not limited in this embodiment of the present application.

The network device 120 in this embodiment may be a device for communicating with a terminal device, where the network device may be an evolved NodeB (eNB or eNodeB) in an LTE system, and may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or the network device may be a relay device, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, one or a group (including multiple antenna panels) of base stations in a 5G system, or may also be a network node forming a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (distributed unit, DU), and the present embodiment is not limited.

In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may also include an Active Antenna Unit (AAU). The CU implements part of the function of the gNB and the DU implements part of the function of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implementing functions of a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer. The DU is responsible for processing a physical layer protocol and a real-time service, and implements functions of a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. The AAU implements part of the physical layer processing functions, radio frequency processing and active antenna related functions. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling, can also be considered as being transmitted by the DU or by the DU + AAU under this architecture. It is to be 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 (RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

In the embodiment of the present application, the terminal device 110 or the network device 120 includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a 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 processing 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 list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided by the embodiment of the present application, as long as the communication can be performed according to the method provided by 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, for example, the execution main body of the method provided by the embodiment of the present application may be a terminal device, or a functional module capable of calling a program and executing the program in the terminal device.

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 available for communication by radio devices, which is generally considered a shared spectrum, i.e., a spectrum that can be used by communication devices in different communication systems as long as the regulatory requirements set by the country or region on the spectrum are met, without requiring a proprietary spectrum license to be applied to the government. In order for various communication systems using unlicensed spectrum for wireless communication to coexist friendly on the spectrum, some countries or regions stipulate regulatory requirements that must be met using unlicensed spectrum. For example, in some regions, the communication device follows the principle of "Listen-Before-Talk (LBT)", that is, the communication device needs to perform channel sensing Before performing signal transmission on a channel of an unlicensed spectrum, and can perform signal transmission only when the channel sensing result is that the channel is idle; if the channel sensing result of the communication device on the channel of the unlicensed spectrum is that the channel is busy, the communication device cannot perform signal transmission. In order to ensure fairness, in one transmission, the duration of signal transmission by the communication device using the Channel of the unlicensed spectrum cannot exceed the Maximum Channel Occupancy Time (MCOT).

2. Search space set configuration and switching

In an NR Unlicensed Spectrum (NR-U) system, a terminal device may be configured with at most two search space set groups (SSS groups) for detecting a PDCCH on one BWP. In the case that two search space set groups are configured, the terminal device only needs to detect a PDCCH in one SSS group for a while. 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 a switch from detecting a PDCCH in group 1 to detecting a PDCCH in group 0.

Currently, the switching of the SSS group includes two ways:

(1) explicit handover

Phi terminal equipment is configured with Flag for indicating SSS group switching in DCI 2-0

The terminal equipment is configured with a detection group indication identification Flag for indicating SSS group switching in DCI 2-0.

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

The terminal equipment switches the SSS group according to the detected Flag indication

And if the terminal equipment does not receive the DCI 2-0, the terminal equipment performs PDCCH detection in the SSS group 0.

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

● 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 has previously performed PDCCH detection in group 1, then the terminal device switches to perform PDCCH detection in group 0.

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

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

as shown in fig. 1F, PDCCH detection is performed after the slot end position at which the timer expires;

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

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

(2) Implicit switching

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

And the DCI 2-0 configured by the terminal equipment is not configured or the DCI 2-0 configured by the terminal equipment does not comprise a detection group indication Flag for indicating SSS group switching.

③ the terminal device determines the switching of the SSS group depending on whether DCI is detected in the SSS group 0, as shown in figure 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 restricted to SSS group 0), the terminal device starts a timer.

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

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

● as shown in FIG. 1J, if the indicated COT length end position is received, PDCCH detection is performed.

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

BWP switching mode 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 a maximum of 4 downlink BWPs, and 4 uplink BWPs. The SSS group may be configured on at least one of the 4 downlink BWPs.

Currently, a UE can only activate one downlink BWP at most, and one uplink BWP. The UE may switch the active BWP based on signaling indications or predefined rules. The method specifically comprises the following modes:

● based on the indication of the DCI, the UE may switch the downlink and/or uplink BWP; for example, when the currently active downlink BWP index is 1, and the DCI is received, the DCI may instruct to switch the active BWP from 1 to 2, that is, deactivate BWP #1 and activate BWP #2

● RRC signaling based indication

● based on configured timer, for example, the UE may switch to a default or initial BWP upon expiration of the timer

● event-based

When the UE triggers the RACH procedure, for example, the currently active uplink BWP does not have RACH resources, the UE may switch from the currently active BWP to the initial BWP to perform the RACH procedure;

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

In the current NR protocol, there is currently no conclusion on how to specify the PDCCH detection behavior of the terminal device if the terminal device has a DL BWP handover on the first cell, e.g. the active BWP is handed over from the first BWP to the second BWP.

In view of the above problem, the present application proposes the following technical ideas for a scenario where a downlink active BWP in a first cell is handed over from a first BWP to a second BWP: the PDCCH detection behavior of the terminal device comprises at least one of the following.

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

● if the second BWP is configured with an SSS group.

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

The terminal device performs PDCCH detection according to the configured first SSS, which includes SSSs not belonging to the SSS group.

● if the second BWP is configured with two SSS groups, the action of the terminal device for PDCCH detection includes one of:

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

■ the first SSS comprises SSS configured to belong to both SSS group 0 and SSS group 1; and/or the presence of a gas in the gas,

■ the first SSS includes SSSs that do not belong to either group 0 or group 1.

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

■ predetermined SSS group is group 0

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

■ further, if the Flag indication 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).

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

■ additionally, 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; alternatively, the PDCCH detection behaviour in the first cell group is determined from PDCCH detection behaviour of the first cell on the second BWP.

The PDCCH detection behavior of the terminal device before and after BWP handover occurs is consistent.

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

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

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

If the terminal device performs PDCCH detection on the first BWP according to SSS group 1, after switching to the second BWP, the terminal device performs PDCCH detection on SSS group 0

■ the time when the terminal device starts to detect on the second BWP is behind the slot end position at which the timer expires; or

■ the time at which the end device starts detecting on the second BWP is after the end of the COT length received indication.

Optionally, since SSS group switching requires a certain latency, BWP switching latency is included in the active BWP switching scenario.

The above design concept will be described in detail with reference to the accompanying drawings. Referring to fig. 2A, fig. 2A is a schematic flowchart of a method for detecting a downlink control channel according to an embodiment of the present application, where as shown in the figure, the method includes:

step 2A01, the terminal device determines that the downlink active bandwidth part BWP in the first cell is switched from the first BWP to the second BWP;

step 2a02, a network device configures a first search space set SSS on a second bandwidth part BWP to a terminal device, where the second BWP is a BWP to which a downlink activation BWP in a first cell determined by the terminal device is switched from a first BWP, and the first SSS is used for 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, no search space set SSS group is configured on the second BWP, the first SSS including at least one SSS configured on the second BWP.

In one possible example, a single SSS group is configured on the second BWP, the first SSS including at least one SSS of 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 SSS group 0 and SSS group 1, the first SSS comprising at least one SSS of the second SSS, wherein,

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

In one possible example, the second BWP is configured to SSS group 0 and SSS group 1, the first SSS includes at least one SSS in a first SSS group, wherein the first SSS group is preset or network device configured, 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 value is 0, the first SSS comprises at least one SSS in the SSS group 0; or the like, or, alternatively,

and if the first switching indication information value is 1, the first SSS comprises at least one SSS in the SSS group 1.

In one possible example, the second BWP is configured SSS group 0 and SSS group 1, the first SSS comprising 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 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 belonging to the first cell group, the first SSS comprising at least one SSS of a first SSS group, wherein the first SSB group is determined according to an identification of an 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 single SSB group, the first SSS comprises at least one SSS in 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.

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

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

if the terminal device detects PDCCH on the first BWP according to SSS group 0 before BWP handover, the first SSS comprises at least one SSS in the SSS group 0 after BWP handover; or the like, or, alternatively,

the first SSS after BWP handover comprises at least one SSS in the SSS group 1, if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover.

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

the first SSS comprises at least one SSS in the SSS group 0 if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover and the time the terminal device starts detecting on the second BWP is after a first duration.

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

It can be seen that, in this embodiment, the terminal device first determines that the downlink active bandwidth part BWP in the first cell is switched from the first BWP to the second BWP; secondly, a Physical Downlink Control Channel (PDCCH) on the second BWP is detected according to the configured first search space set SSS on the second BWP. As can be seen, the PDCCH detection behavior on the active BWP is implemented by the SSS configured on the currently active BWP, which can effectively specify the PDCCH detection behavior of the terminal device during the BWP handover process.

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

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

Optionally, for SSS configured to belong to neither group 0 nor group 1, the terminal device always needs PDCCH detection in that 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 that the SSS group should be handed over according to case 1 or case 2 according to configuration signaling of the network device. For example, at least one cell in the first cell group is configured with a detection group indication Flag for indicating SSS group handover, and if flags corresponding to all cells in the at least one cell indicate the same value, the terminal device performs SSS group handover according to case 1. For another example, at least two cells in the first cell group are configured with a detection group indication Flag for indicating SSS group handover, and if the Flag indications corresponding to at least two cells in the at least two cells are different values, the terminal device performs SSS group handover according to the case 2. For another example, the network device instructs the terminal device to perform SSS group handover according to case 1 or case 2 through configuration signaling.

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

Optionally, the terminal device reports to the network device whether to support switching of the SSS group according to the case 1 or the case 2.

● case 1: the PDCCH detection behavior of the terminal is determined per cell group, or the PDCCH detection behavior of the terminal is consistent over active BWPs for all cells in a cell group.

● case 2: the PDCCH detection behavior of the terminal device is cell-wise determined, or the PDCCH detection behavior on active BWP of each cell in a cell group by the terminal device is independent.

In view of the foregoing situation 1, an embodiment of the present application further provides a flowchart of another method for detecting a downlink control channel, and as shown in fig. 2B, the method includes:

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

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

In a specific implementation, the determining manner of the PDCCH detection behavior on the active 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 with a detection group indication Flag for indicating SSS group handover in downlink control information DCI 2-0, and the Flag corresponding to the at least one cell indicates the same value, the terminal device determines, according to the indication of Flag, a PDCCH detection behavior on active BWP in the first cell group through SSS group handover rule in SSS group explicit handover (i.e. the aforementioned explicit handover).

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

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 a special cell sPCell is included in the at least two cells, 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 a minimum cell index or a cell with a maximum cell index or a preset cell or a cell configured by the network device.

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

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 cell and a secondary cell PScell, the second cell is the PScell; or, if a special cell sPCell is included in the at least two cells, the second cell is the sPCell.

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

Fourthly, the terminal equipment determines PDCCH detection behaviors on the activated BWP in the first cell group according to SSS group switching rules in an SSS group explicit switching mode or an SSS group implicit switching mode of the second cell in the first cell group.

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

Optionally, if the second cell is not configured with the detection group indication Flag for indicating SSS group handover in DCI 2-0, the terminal device determines, according to the SSS group handover rule in mode 2, a PDCCH detection behavior on active BWP in the first cell group according to the second cell in the first cell group.

Correspondingly, the first cell group comprises the first cell, and the detection behavior of the terminal device on the PDCCH on the active BWP in the first cell group is the same as the detection behavior of the PDCCH 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 behavior on BWP in a cell group determination manner, that is, the PDCCH detection behaviors on the activated BWP of all cells in one cell group are consistent, so that the PDCCH detection behavior of the terminal device after the RRC configuration takes effect or during the BWP handover is effectively specified.

The above-mentioned scheme of the embodiment of the present application is introduced mainly from the perspective of interaction between network elements on the method side. It is understood that the terminal device and the network device include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the 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 performed as hardware or computer software drives 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.

In the embodiment of the present application, the terminal device and the network device may be divided into the functional units according to the above method examples, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit may be implemented in the form of hardware, or may be implemented in the form of a software program module. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

In the case of using an integrated unit, fig. 3 shows a block diagram of functional units of a downlink control channel detection apparatus. The apparatus 300 for detecting a downlink control channel is applied to a terminal device, and specifically includes: a processing unit 302 and a communication unit 303. The processing unit 302 is configured to control and manage the actions of the terminal device, for example, the processing unit 302 is configured to support the terminal device to perform steps 202 and 204 in fig. 2A and other processes for the technology described herein. The communication unit 303 is used to support communication between the terminal device and other devices. The terminal device may further comprise a storage unit 301 for storing program codes and data of the terminal device.

The Processing Unit 302 may be a Processor or a controller, and may be, for example, a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. 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 the terminal device shown in fig. 3.

In a specific 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 the corresponding operation. The details will be described below.

The processing unit 302 is configured to: determining that a downlink active bandwidth part (BWP) in a first cell is switched from a first BWP to a second BWP; and detecting, by the communication unit, a Physical Downlink Control Channel (PDCCH) on the second BWP according to the configured first Search Space Set (SSS) on the second BWP.

It can be seen that, in this embodiment, the terminal device first determines that the downlink active bandwidth part BWP in the first cell is switched from the first BWP to the second BWP; secondly, detecting a physical downlink control channel PDCCH on a second BWP according to a configured first search space set SSS on the second BWP. As can be seen, the PDCCH detection behavior on the active BWP is implemented by the SSS configured on the currently active BWP, which can effectively specify the PDCCH detection behavior of the terminal device during the BWP handover process.

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

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

In the case of using an integrated unit, fig. 4 shows a block diagram of functional units of another detection apparatus for a downlink control channel. The apparatus 400 for detecting a downlink control channel is applied to a network device, and the network device includes: a processing unit 402 and a communication unit 403. Processing unit 402 is used to control and manage the actions of the network device, e.g., processing unit 502 is used 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 between the network device and other devices. The network device may further comprise a storage unit 401 for storing program codes and data of the terminal device.

The Processing Unit 402 may be a Processor or a controller, such as a Central Processing Unit (CPU), a general-purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication unit 403 may be a communication interface, a transceiver, a transceiving circuit, etc., 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: configuring, by the communication unit, a first search space set SSS on a second bandwidth part BWP to a terminal device, where the second BWP is a BWP to which a downlink activation BWP in a first cell determined by the terminal device is switched by a first BWP, and the first SSS is used 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 configuring first handover indication information of the first cell to a terminal device, wherein,

In one possible example, the first SSS group is the 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, and is not described herein again.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a terminal device 500 according to an embodiment of the present disclosure, 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.

The memory 520 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM), and the memory 520 is used for related instructions and data.

Communication interface 530 is used to receive and transmit data.

The processor 510 may be one or more Central Processing Units (CPUs), and in the case that the processor 510 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

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

It should be noted that, the implementation of each operation may also correspond to the corresponding description with reference to the method embodiment shown in fig. 2A, and the terminal device 500 may be configured to execute the method on the terminal device side in the foregoing method embodiment of the present application.

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

Referring to fig. 6, fig. 6 is a schematic structural diagram of a network device 600 according to an embodiment of the present disclosure, and 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.

The memory 620 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM), and the memory 620 is used for related instructions and data.

Communication interface 630 is used for receiving and transmitting data.

The processor 610 may be one or more Central Processing Units (CPUs), and in the case that the processor 610 is one 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 the one or more program codes 621 stored in the memory 620, and perform the following operations: invoking the communication interface 630 to configure a first search space set SSS on a second bandwidth part BWP to a terminal device, where the second BWP is a BWP to which a downlink activation BWP in a first cell determined by the terminal device is switched by a first BWP, and the first SSS is used for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.

It should be noted that, 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 configured to execute 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 active BWP is implemented by SSS configured on currently active BWP, which can effectively specify the PDCCH detection behavior of the terminal device during BWP handover.

The embodiment of the present application further provides a chip, where the chip includes a processor, configured to call and run a computer program from a memory, so that a device installed with the chip performs part or all of the steps described in the terminal device in the foregoing method embodiment.

The embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform some or all of the steps described in the terminal device in the above method embodiment.

The embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program causes a computer to perform some or all of the steps described in the above method embodiment for a network-side device.

The present application further provides a computer program product, where the computer program product includes a computer program operable to cause a computer to execute some or all of the steps described in 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 the embodiments of the present application may be implemented in hardware or by executing software instructions by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc 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. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in an access network device, a target network device, or a core network device. Of course, the processor and the storage medium may 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 functionality described in the embodiments of the present application may be implemented, in whole or in part, by 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, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the 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 Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the embodiments of the present application in further detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements and the like 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

A method for detecting a downlink control channel is characterized by comprising the following steps:

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

and the terminal equipment detects a Physical Downlink Control Channel (PDCCH) on the second BWP according to the configured first search space set SSS on the second BWP.
The method of claim 1, wherein no Search Space Set (SSS) set is configured on the second BWP, and wherein the first SSS comprises at least one SSS configured on the second BWP.
The method of claim 1, wherein a single SSS group is configured on the second BWP, and wherein the first SSS comprises at least one SSS of the single SSS group.
The method of claim 1, wherein a single SSS group is configured on the second BWP, wherein the first SSS comprises at least one SSS configured on the second BWP, and wherein the first SSS does not comprise SSSs belonging to the single SSS group.
The method of claim 1, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a second SSS, wherein,

the second SSS includes SSSs belonging to both the SSS group 0 and SSS group 1, and the second SSS includes SSS belonging to neither the SSS group 0 nor SSS group 1.
The method of claim 1 or 5, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, and wherein the first SSS group is the SSS group 0 or SSS group 1.
The method of claim 1, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the terminal device is configured with first handover indication information for the first cell, wherein,

if the first switching indication information value is 0, the first SSS comprises at least one SSS in the SSS group 0; or the like, or, alternatively,

and if the first switching indication information value is 1, the first SSS comprises at least one SSS in the SSS group 1.
The method of claim 1 or 7, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, wherein 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.
The method of claim 1, wherein the second BWP is configured for SSS group 0 and SSS group 1, wherein the first cell belongs to the first cell group, wherein the first SSS comprises at least one SSS in a first SSS group, and wherein the first SSB group is determined based on an identification of an SSS group detected by the terminal device on a second cell in the first cell group.
The method of claim 1, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is not configured with SSS group or is configured with single SSB group, wherein 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 SSS group 0 or SSS group 1.
The method of any of claims 6, 8 or 10, wherein the first SSS group is the SSS group 0.
The method of claim 1, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

if the terminal device detects PDCCH on the first BWP according to SSS group 0 before BWP handover, the first SSS comprises at least one SSS in the SSS group 0 after BWP handover; or the like, or, alternatively,

the first SSS after BWP handover comprises at least one SSS in the SSS group 1, if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover.
The method of claim 1, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

the first SSS comprises at least one SSS in the SSS group 0 if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover and the time the terminal device starts detecting on the second BWP is after a first duration.
The method of claim 13, wherein the first duration is determined based on a duration for which the terminal device detects the PDCCH on the first BWP in accordance with the SSS group 1.
A method for detecting a downlink control channel is characterized by comprising the following steps:

a network device configures a first search space set SSS on a second bandwidth part BWP to a terminal device, where the second BWP is a BWP to which a first BWP is switched for a downlink active BWP in a first cell determined by the terminal device, and the first SSS is used for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.
The method of claim 15, wherein no Search Space Set (SSS) set is configured on the second BWP, and wherein the first SSS comprises at least one SSS configured on the second BWP.
The method of claim 15, wherein a single SSS group is configured on the second BWP, and wherein the first SSS comprises at least one SSS of the single SSS group.
The method of claim 15, wherein a single SSS group is configured on the second BWP, wherein the first SSS comprises at least one SSS configured on the second BWP, and wherein the first SSS does not comprise SSSs belonging to the single SSS group.
The method of claim 15, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a second SSS, wherein,

the second SSS includes SSSs belonging to both the SSS group 0 and SSS group 1, and the second SSS includes SSS belonging to neither the SSS group 0 nor SSS group 1.
The method of claim 15 or 19, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS in a first SSS group, wherein the first SSS group is pre-set or network device configured, and wherein the first SSS group is SSS group 0 or SSS group 1.
The method of claim 15, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the network device configures first handover indication information for the first cell to a terminal device, wherein,

if the first switching indication information value is 0, the first SSS comprises at least one SSS in the SSS group 0; or the like, or, alternatively,

and if the first switching indication information value is 1, the first SSS comprises at least one SSS in the SSS group 1.
The method of claim 15 or 21, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, wherein 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.
The method of claim 15, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first cell belongs to the first cell group, wherein the first SSS comprises at least one SSS in a first SSS group, and wherein the first SSB group is determined according to an identification of an SSS group detected by the terminal device on a second cell in the first cell group.
The method of claim 15, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is not configured with SSS group or is configured with single SSB group, wherein 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 SSS group 0 or SSS group 1.
The method of any of claims 20, 22 or 24, wherein the first SSS group is SSS group 0.
The method of claim 15, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

if the terminal device detects PDCCH on the first BWP according to SSS group 0 before BWP handover, the first SSS comprises at least one SSS in the SSS group 0 after BWP handover; or the like, or, alternatively,

the first SSS after BWP handover comprises at least one SSS in the SSS group 1, if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover.
The method of claim 15, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

the first SSS comprises at least one SSS in the SSS group 0 if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover and the time the terminal device starts detecting on the second BWP is after a first duration.
The method of claim 27, wherein the first duration is determined based on a duration for which the terminal device detects the PDCCH on the first BWP in accordance with the SSS group 1.
The device for detecting the downlink control channel is applied to a terminal device, and comprises a processing unit and a communication unit, wherein the processing unit is configured to: determining that a downlink active bandwidth part (BWP) in a first cell is switched from a first BWP to a second BWP; and detecting, by the communication unit, a Physical Downlink Control Channel (PDCCH) on the second BWP according to the configured first Search Space Set (SSS) on the second BWP.
The apparatus of claim 29, wherein no set of Search Space Sets (SSS) is configured on the second BWP, and wherein the first SSS comprises at least one SSS configured on the second BWP.
The apparatus of claim 29, wherein a single SSS group is configured on the second BWP, and wherein the first SSS comprises at least one SSS of the single SSS group.
The apparatus of claim 29, wherein a single SSS group is configured on the second BWP, wherein the first SSS comprises at least one SSS configured on the second BWP, and wherein the first SSS does not comprise SSSs belonging to the single SSS group.
The apparatus of claim 29, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a second SSS, wherein,

the second SSS includes SSSs belonging to both the SSS group 0 and SSS group 1, and the second SSS includes SSS belonging to neither the SSS group 0 nor SSS group 1.
The apparatus of claim 29 or 33, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, and wherein the first SSS group is SSS group 0 or SSS group 1.
The apparatus of claim 29, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the terminal device is configured with first handover indication information for the first cell, wherein,

if the first switching indication information value is 0, the first SSS comprises at least one SSS in the SSS group 0; or the like, or, alternatively,

and if the first switching indication information value is 1, the first SSS comprises at least one SSS in the SSS group 1.
The apparatus of claim 29 or 35, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, wherein the first SSS group is the SSS group 0 or 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.
The apparatus of claim 29, wherein the second BWP is configured to SSS group 0 and SSS group 1, wherein the first cell belongs to the first cell group, wherein the first SSS comprises at least one SSS in a first SSS group, and wherein the first SSB group is determined based on an identification of an SSS group detected by the terminal device on a second cell in the first cell group.
The apparatus of claim 29, wherein the second BWP is configured to SSS group 0 and SSS group 1, wherein the first BWP is not configured to SSS group or is configured to SSB group, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, and wherein the first SSS group is SSS group 0 or SSS group 1.
The apparatus of any of claims 34, 36 or 37, wherein the first SSS group is the SSS group 0.
The apparatus of claim 29, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

if the terminal device detects PDCCH on the first BWP according to SSS group 0 before BWP handover, the first SSS comprises at least one SSS in the SSS group 0 after BWP handover; or the like, or, alternatively,

the first SSS after BWP handover comprises at least one SSS in the SSS group 1, if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover.
The apparatus of claim 29, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

the first SSS comprises at least one SSS in the SSS group 0 if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover and the time the terminal device starts detecting on the second BWP is after a first duration.
The apparatus of claim 41, wherein the first duration is determined based on a duration for which the terminal device detects PDCCH on the first BWP in accordance with the SSS group 1.
A device for detecting a downlink control channel, applied to a network device, the device comprising a processing unit and a communication unit, wherein the processing unit is configured to: configuring, by the communication unit, a first search space set SSS on a second bandwidth part BWP to a terminal device, where the second BWP is a BWP to which a downlink activation BWP in a first cell determined by the terminal device is switched by a first BWP, and the first SSS is used for the terminal device to detect a physical downlink control channel PDCCH on the second BWP.
The apparatus of claim 43, wherein no Search Space Set (SSS) group is configured on the second BWP, and wherein the first SSS comprises at least one SSS configured on the second BWP.
The apparatus of claim 43, wherein a single SSS group is configured on the second BWP, and wherein the first SSS comprises at least one SSS of the single SSS group.
The apparatus of claim 43, wherein a single SSS group is configured on the second BWP, wherein the first SSS comprises at least one SSS configured on the second BWP, and wherein the first SSS does not comprise an SSS belonging to the single SSS group.
The apparatus of claim 43, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a second SSS, wherein,

the second SSS includes SSSs belonging to both the SSS group 0 and SSS group 1, and the second SSS includes SSS belonging to neither the SSS group 0 nor SSS group 1.
The apparatus of claim 43 or 47, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is predefined or network device configured, and wherein the first SSS group is the SSS group 0 or the SSS group 1.
The apparatus of claim 43, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the network device configures first handover indication information for the first cell to a terminal device, wherein,

if the first switching indication information value is 0, the first SSS comprises at least one SSS in the SSS group 0; or the like, or, alternatively,

and if the first switching indication information value is 1, the first SSS comprises at least one SSS in the SSS group 1.
The apparatus of claim 43 or 49, wherein the second BWP is configured SSS group 0 and SSS group 1, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, wherein 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.
The apparatus of claim 43, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first cell belongs to the first cell group, wherein the first SSS comprises at least one SSS of a first SSS group, and wherein the first SSB group is determined based on an identification of an SSS group detected by the terminal device on a second cell of the first cell group.
The apparatus of claim 43, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is not configured with SSS group or is configured with a single SSB group, wherein the first SSS comprises at least one SSS of a first SSS group, wherein the first SSS group is pre-set or network device configured, and wherein the first SSS group is the SSS group 0 or the SSS group 1.
The apparatus of any of claims 48, 50 or 52, wherein the first SSS group is the SSS group 0.
The apparatus of claim 43, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

if the terminal device detects PDCCH on the first BWP according to SSS group 0 before BWP handover, the first SSS after BWP handover comprises at least one SSS in the SSS group 0; or the like, or, alternatively,

the first SSS after BWP handover comprises at least one SSS in the SSS group 1, if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover.
The apparatus of claim 43, wherein the second BWP is configured with SSS group 0 and SSS group 1, wherein the first BWP is configured with SSS group 0 and SSB group 1,

the first SSS comprises at least one SSS in SSS group 0 if the terminal device detects PDCCH according to SSS group 1 on the first BWP before BWP handover and the time when the terminal device starts detecting on the second BWP is after a first duration.
The apparatus of claim 55, wherein the first duration is determined based on a duration for which the terminal device detects PDCCH on the first BWP in accordance with the SSS group 1.
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 1-14.
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 including instructions for performing the steps in the method of any of claims 15-28.
A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any of claims 1-14 or 15-28.
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 1-14 or 15-28.
A computer program for causing a computer to perform the method of any one of claims 1-14 or 15-28.