WO2020088423A1

WO2020088423A1 - Communication method and apparatus

Info

Publication number: WO2020088423A1
Application number: PCT/CN2019/113768
Authority: WO
Inventors: 肖洁华; 阿布多利贾瓦德; 唐臻飞
Original assignee: 华为技术有限公司
Priority date: 2018-11-02
Filing date: 2019-10-28
Publication date: 2020-05-07
Also published as: CN111148259A; CN111148259B

Abstract

Disclosed are a communication method and apparatus. The method comprises: regarding a second search space in an activated BWP of a second cell, determining a first search space in an activated BWP of a first cell; determining a resource position of a first PDCCH according to the first search space, wherein the resource position of the first PDCCH is located in a resource of the second cell; and finally, detecting the first PDCCH in the resource position of the first PDCCH. By using the method and the apparatus of the present application, the first PDCCH can be determined by means of the first search space in the activated BWP of the first cell.

Description

Communication method and device

Cross-reference of related applications

This application requires the priority of the Chinese patent application filed on November 02, 2018, with the application number 201811303215.5 and the application name "a communication method and device", the entire content of which is incorporated by reference in this application .

Technical field

This application relates to the field of communication technology, and in particular, to a communication method and device.

Background technique

In the wireless communication system, the communication between the network device and the terminal device is based on the cell as a service unit. How to send or monitor the physical downlink control channel in different cells is a problem that needs to be solved at present.

Summary of the invention

Embodiments of the present application provide a communication method and device for receiving a first PDCCH scheduling a first cell in resources of a second cell.

In a first aspect, a communication method is provided. The method is applicable to a terminal device and includes: determining a first search space of an active bandwidth part BWP of a first cell; and determining a first physical downlink control channel according to the first search space PDCCH resource location, the first PDCCH is used to send control information of the first cell, the resource location of the first PDCCH is located in the resource of the second cell; the location is detected in the resource location of the first PDCCH The first PDCCH is described.

It can be seen from the above that, in the embodiment of the present application, the first search space configured in the BWP can be activated by the first cell to calculate the resource position of the PDCCH of the first cell, thereby avoiding the use of the search configured in the inactive BWP of the first cell Space, calculate the resource location of the PDCCH of the first cell. In a possible design, the determining the first search space of the activated BWP of the first cell includes: determining the second search space of the activated BWP of the second cell; according to the second search space and the first The corresponding relationship of the search space determines the first search space, and the resource position of the first PDCCH is located in the control resource set associated with the second search space.

In the embodiment of the present application, the second cell may be a scheduling cell, and the first cell may be a scheduled cell. In the embodiment of the present application, the second search space in the scheduling cell and the first in the scheduled cell may be flexibly set Correspondence of the search space, and when switching is activated when BWP is activated, cross-carrier scheduling can also be achieved.

In a possible design, the number of the first search space is one, and the first search space corresponds to all second search spaces of the second cell.

In a possible design, the number of the first search space is N, and the number of the second search space is M, both M and N are positive integers greater than or equal to 1, and the M is less than or equal to N, and the M second search spaces correspond to the M first search spaces one-to-one.

In the embodiment of the present application, the number of candidate PDDCHs included in the N first search spaces may be the same or different, compared to the solution that the number of candidate PDCCHs included in the N first search spaces must be the same , Can increase the flexibility of configuration.

In a possible design, the number of the first search space is N, and the number of the second search space is M, both N and M are positive integers greater than or equal to 1, the jth The first search space and the i-th second search space satisfy the following correspondence: j = i mod N;

Wherein, the value of i is greater than or equal to 0 and less than or equal to M-1, and the value of j is greater than or equal to 0 and less than or equal to N-1.

In the embodiment of the present application, no matter what the value of the number of the first search space and the second search space is, through the above correspondence relationship of j = i mod N, the correspondence relationship between the two can be established. flexible.

In a possible design, the method further includes: sorting the M second search spaces according to the first rule, where i represents the sequence number of the M second search spaces after sorting; Two rules: sort the N first search spaces, and j represents the sequence number of the N first search spaces after sorting. In a possible design, the resource location of the first PDCCH includes the frequency domain resource location of the first PDCCH and the time domain resource location of the first PDCCH, and the first search space includes one or more Candidate

For the first

Candidate PDCCH, the determining the resource position of the first PDCCH according to the first search space includes:

Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, the L is an integer greater than or equal to 0; s _m denotes the second search space; p denotes the second search space associated with the Set of control resources; the μ represents the parameter set corresponding to the BWP where the second search space is located;

Represents the time-domain resource position of the first PDCCH; the

When the time domain resource position of the first PDCCH is

Time, the starting position parameter of the first PDCCH frequency domain resource position, the

Is determined based on the second search space s _m; the s _n denotes the first search space; n _CI represents the said carrier indicator field CIF a first cell; the

Denotes the sequence number of the first search space of PDCCH candidates s _n; the N _{CCE, p} represents the number of the control channel resource units included in the CCE p set; the

Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled, the search space of s _n and the second search space corresponding to s _m, the number of PDCCH candidates included Maximum value; the value of i is greater than or equal to 0, and less than or equal to L-1.

In a possible design, the resource location of the first PDCCH includes the frequency domain resource location of the first PDCCH and the time domain resource location of the first PDCCH, and the first search space includes one or more Candidate PDCCH;

For the first

Candidate PDCCH, the determining the resource position of the first PDCCH according to the first search space includes: determining the first

Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, the L is an integer greater than or equal to 0; s _n denotes the first search space; p denotes the second search space associated with the Control resource collection;

The n _CI represents the carrier indication field CIF of the first cell; the μ represents a parameter set corresponding to the BWP where the first search space is located; the

Represents the time-domain resource position of the first PDCCH; the

When the time-frequency resource position of the first PDCCH is

Time, the starting position parameter of the frequency domain resource position of the first PDCCH, the

Is determined based on the first search space s _n; the

Denotes the sequence number of the first search space of PDCCH candidates s _n; the N _{CCE, p} represents the number of the control channel element CCE resource included in the set p; the

In a possible design, the method further includes: determining that the second cell activates a second search space of BWP;

Determining a resource position of a second PDCCH according to the second search space, the second PDCCH is used to send control information of the second cell, and the resource position of the second PDCCH is located in the resource of the second cell .

In a possible design, the resource position of the second PDCCH includes the frequency domain resource position of the second PDCCH and the time domain resource position of the second PDCCH, and the second search space includes one or more Candidate PDCCH;

For the first

Candidate PDCCHs, and determining the resource position of the second PDCCH according to the second search space includes: determining the

Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the second PDCCH, the L is an integer greater than or equal to 0; s _m denotes the second search space; p denotes the second search space associated with the Set of control resources; the μ represents the parameter set corresponding to the BWP where the second search space is located;

Represents the time-domain resource position of the second PDCCH; the

When the time-frequency resource position of the second PDCCH is

Time, the starting position parameter of the second PDCCH frequency domain resource position, the

Is determined based on the second search space s _m; n _CI represents the said carrier indicator field CIF a second cell; the

Represents PDCCH candidates in the second search space s _m sequence number; the N _{CCE, p} represents the number of the control channel element CCE resource included in the set p; the

Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled in the second search space corresponding to s _m search space, the maximum number of PDCCH candidates included ; The value of i is greater than or equal to 0, and less than or equal to L-1.

In a second aspect, a communication method is provided. The method can be applied to a network device and includes: determining a first search space of an active bandwidth part BWP of a first cell; and determining a first physical downlink control channel according to the first search space The resource position of the PDCCH, the first PDCCH is used to send the control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell; the resource position of the first PDCCH is transmitted The first PDCCH is described.

In a possible design, the determining the first search space of the activated BWP of the first cell includes: determining the second search space of the activated BWP of the second cell; according to the second search space and the first The corresponding relationship of the search space determines the first search space, and the resource position of the first PDCCH is located in the control resource set associated with the second search space.

In a possible design, the number of the first search space is N, and the number of the second search space is M, both N and M are positive integers greater than or equal to 1, the jth The first search space and the i-th second search space satisfy the following correspondence: j = i mod N; wherein, the value of i is greater than or equal to 0, less than or equal to M-1, and the value of j is greater than Or equal to 0, less than or equal to N-1.

In a possible design, the method further includes: sorting the M second search spaces according to the first rule, where i represents the sequence number of the M second search spaces after sorting; Two rules: sort the N first search spaces, and j represents the sequence number of the N first search spaces after sorting.

For the first search space

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time domain resource position of the first PDCCH is

For the first search space

Candidate PDCCHs, the determining the resource position of the first PDCCH according to the first search space includes: determining the first

Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, the L is an integer greater than or equal to 0; s _n denotes the first search space; p denotes the second search space associated with the Set of control resources; the n _CI represents the carrier indication field CIF of the first cell; the μ represents the parameter set corresponding to the BWP where the first search space is located;

Represents the time-domain resource position of the first PDCCH; the

When the time-frequency resource position of the first PDCCH is

Is determined based on the first search space s _n; the

In a possible design, the resource location of the second PDCCH includes the frequency domain resource location of the second PDCCH and the time domain resource location of the second PDCCH, and the second search space includes greater than or equal to A candidate PDCCH;

For the candidate PDCCH

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the second PDCCH; the

When the time-frequency resource position of the second PDCCH is

In a third aspect, an embodiment of the present application provides an apparatus, which may be a terminal device or an apparatus in a terminal device, and the apparatus may include a processing module and a receiving module, and these modules may perform any of the first aspect The corresponding functions performed by the terminal equipment in this design example, specifically:

The processing module is used to determine the first search space of the active bandwidth part BWP of the first cell, and determine the resource position of the first physical downlink control channel PDCCH according to the first search space, the first PDCCH is used to send The control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell;

The receiving module is configured to receive the first PDCCH in the resource position of the first PDCCH.

In a possible design, when the processing module determines the first search space of the activated BWP of the first cell, it is specifically used to: determine the second search space of the activated BWP of the second cell; according to the second search The correspondence between the space and the first search space determines the first search space, and the resource position of the first PDCCH is located in the control resource set associated with the second search space.

In a possible design, the processing module is further used to: sort the M second search spaces according to the first rule, where i represents the sequence number of the M second search spaces after sorting; Two rules: sort the N first search spaces, and j represents the sequence number of the N first search spaces after sorting.

In a possible design, the resource location of the first PDCCH includes the frequency domain resource location of the first PDCCH and the time domain resource location of the first PDCCH, and the first search space includes one or more Candidate

For the first search space

Candidate PDCCHs, the processing module, when determining the resource position of the first PDCCH according to the first search space, includes: determining the first

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time domain resource position of the first PDCCH is

In a possible design, the resource location of the first PDCCH includes the frequency domain resource location of the first PDCCH and the time domain resource location of the first PDCCH, and the first search space includes one or more The number of candidate PDCCHs;

For the first search space

Resource positions of PDCCH candidates:

Represents the time-domain resource location of the first PDCCH, where

Can also be abbreviated as

Said

When the time-frequency resource position of the first PDCCH is

Time, the starting position parameter of the frequency domain resource position of the first PDCCH, where

Can also be abbreviated as

Said

Is determined based on the first search space s _n; the

In a possible design, the processing module is further configured to: determine a second search space in which the second cell activates BWP; and determine a resource position of the second PDCCH according to the second search space, and the second PDCCH uses For sending the control information of the second cell, the resource position of the second PDCCH is located in the resource of the second cell.

For the candidate PDCCH

Candidate PDCCHs, when the processing module determines the resource position of the second PDCCH according to the second search space, it includes: determining the

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the second PDCCH; the

When the time-frequency resource position of the second PDCCH is

According to a fourth aspect, an embodiment of the present application provides an apparatus. The apparatus may be a network device or an apparatus in a network device. The apparatus may include a processing module and a sending module. These modules may perform any of the above-mentioned second aspects. The corresponding functions performed by the network devices in this design example, specifically:

A sending module, configured to send the first PDCCH in the resource position of the first PDCCH.

For the first search space

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time domain resource position of the first PDCCH is

For the first search space

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time-frequency resource position of the first PDCCH is

Is determined based on the first search space s _n; the

In a possible design, the processing module is further configured to: determine that the second cell activates the second search space of the BWP;

For the candidate PDCCH

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the second PDCCH; the

When the time-frequency resource position of the second PDCCH is

According to a fifth aspect, an embodiment of the present application provides a communication apparatus. The communication apparatus includes a processor, configured to implement the function of the terminal device in the method described in the first aspect. The communication device may further include a memory for storing program instructions and data. The memory is coupled to the processor, and the processor can call and execute program instructions stored in the memory to implement the functions of the terminal device in the method described in the first aspect. The communication device may further include a communication interface used for the communication device to communicate with other devices. Illustratively, the other device is a network device. In a possible device, the communication device includes:

Memory, used to store program instructions;

A processor, configured to determine a first search space of the active bandwidth part BWP of the first cell, and determine a resource position of a first physical downlink control channel PDCCH according to the first search space, the first PDCCH is used to transmit the According to the control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell.

The communication interface is used for receiving the first PDCCH in the resource position of the first PDCCH, and the communication interface is used for the communication device to communicate with other devices. Illustratively, the communication interface may be a transceiver.

In a possible design, when the processor determines the first search space for activating BWP of the first cell, it is specifically used to: determine the second search space for activating BWP of the second cell; according to the second search The correspondence between the space and the first search space determines the first search space, and the resource position of the first PDCCH is located in the control resource set associated with the second search space.

In a possible design, the processor is further configured to: sort the M second search spaces according to the first rule, where i represents the sequence number of the M second search spaces after sorting; Two rules: sort the N first search spaces, and j represents the sequence number of the N first search spaces after sorting.

For the first search space

Candidate PDCCHs, when the processor determines the resource position of the first PDCCH according to the first search space, it includes: determining the first

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time domain resource position of the first PDCCH is

For the first search space

Candidate PDCCHs, the processor, when determining the resource position of the first PDCCH according to the first search space, includes: determining the first

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time-frequency resource position of the first PDCCH is

Is determined based on the first search space s _n; the

In a possible design, the processor is further configured to: determine a second search space in which the second cell activates BWP; determine a resource position of the second PDCCH according to the second search space, and use the second PDCCH For sending the control information of the second cell, the resource position of the second PDCCH is located in the resource of the second cell.

For the candidate PDCCH

Candidate PDCCH, when the processor determines the resource position of the second PDCCH according to the second search space, it includes

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the second PDCCH; the

When the time-frequency resource position of the second PDCCH is

According to a sixth aspect, an embodiment of the present application provides a communication apparatus. The communication apparatus includes a processor, configured to implement the function of a network device in the method described in the second aspect above. The communication device may further include a memory for storing program instructions and data. The memory is coupled to the processor, and the processor can call and execute program instructions stored in the memory to implement the functions of the network device in the method described in the second aspect above. The communication device may further include a communication interface used for the communication device to communicate with other devices. Illustratively, the other device is a terminal device. In a possible device, the communication device includes:

Memory, used to store program instructions;

The communication interface is used for sending the first PDCCH in the resource position of the first PDCCH, and the communication interface is used for the device to communicate with other devices. Illustratively, the communication interface may be a transceiver.

For the first search space

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time domain resource position of the first PDCCH is

For the first search space

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the first PDCCH; the

When the time-frequency resource position of the first PDCCH is

Is determined based on the first search space s _n; the

For the candidate PDCCH

Candidate PDCCHs, the processor, when determining the resource position of the second PDCCH according to the second search space, includes: determining the

Resource positions of PDCCH candidates:

Represents the time-domain resource position of the second PDCCH; the

When the time-frequency resource position of the second PDCCH is

According to a seventh aspect, an embodiment of the present application further provides a computer-readable storage medium, including instructions that, when run on a computer, cause the computer to execute the method described in the first aspect or the second aspect.

In an eighth aspect, a computer program product is also provided in an embodiment of the present application, including instructions that, when run on a computer, cause the computer to execute the method described in the first aspect or the second aspect.

In a ninth aspect, an embodiment of the present application provides a chip system. The chip system includes a processor, and may further include a memory, for implementing the function of the network device in the above method. The chip system may be composed of chips, or may include chips and other discrete devices.

According to a tenth aspect, an embodiment of the present application provides a chip system. The chip system includes a processor, and may further include a memory, for implementing the function of the terminal in the above method. The chip system may be composed of chips, or may include chips and other discrete devices.

According to an eleventh aspect, an embodiment of the present application provides a system including the communication device according to the third aspect or the fifth aspect, and the communication device according to the fourth aspect or the sixth aspect.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of cross-carrier scheduling provided by an embodiment of the present application;

2 is a schematic diagram of CORESET provided by an embodiment of the present application;

FIG. 3 is an example of cross-carrier scheduling provided by an embodiment of the present application;

4 is an example of a BWP provided by an embodiment of this application;

5 to 7 are schematic diagrams of cross-carrier scheduling provided by embodiments of the present application;

FIG. 8 is an example of the location of PDCCH time-domain resources provided by an embodiment of the present application;

9 and 10 are flowcharts of communication methods provided by embodiments of the present application;

11 to 14 are examples of cross-carrier scheduling provided by embodiments of the present application;

15 is an example of candidate PDCCH positions;

16 and 17 are an example of a communication device provided by an embodiment of this application;

FIG. 18 is an example of a communication system provided by an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application.

In wireless communication systems, there are concepts of self-scheduling and cross-carrier scheduling. Among them, self-scheduling refers to the physical downlink shared channel (physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH) physical downlink control channel (physical downlink link control channel sent on the carrier , PDCCH) scheduling. Cross-carrier scheduling means that the PDSCH or PUSCH on one carrier is scheduled by the PDCCH sent on other carriers. In addition, the PDCCH can also be used to carry downlink control information, such as downlink semi-persistent scheduling (SPS) activation or release, aperiodic channel state information (channel) state information (CSI) reporting trigger and aperiodic Channel state information reference signal (channel-state information reference, CSI-RS) resource triggering, etc. The self-scheduling concept can also be described as: downlink control information on a carrier is carried by the PDCCH on the carrier, said The concept of cross-carrier scheduling can also be described as: downlink control information on one carrier is carried by PDCCHs sent on other carriers. In the embodiments of the present application, both self-scheduling and cross-carrier scheduling are described by taking PDSCH scheduling as an example, and are not intended to limit the present application.

For example, two carriers are set, namely a first carrier and a second carrier. The first carrier corresponds to a primary cell (PCell), and the second carrier corresponds to a secondary cell (SCell). As shown in FIG. 1, the base station can send two PDCCHs in the primary cell, which are used to schedule the PDSCH on the primary cell and the PDSCH on the secondary cell, respectively.

Among them, as shown in FIG. 2, in the fifth-generation mobile communication system, the time-frequency resources for wireless communication between a base station and a terminal device can be divided into two parts, namely a control region and a data region, where the control region includes Or multiple control resource sets (control resource, set, CORESET), still refer to FIG. 2, the entire control area may include two control resource sets, namely CORESET1 and CORESET2, each control resource set may include one or more control channels In a control-channel element (CCE), the base station may map one PDCCH to one or more CCEs for transmission.

For the terminal device, the number of CCEs mapped by each PDCCH may vary, and there is no signaling, so the terminal device needs to perform blind detection on the PDCCH in the control resource set. Further, in order to reduce the number of blind reductions and the complexity of the blind reduction of the terminal device, a series of positions where PDCCHs may appear is defined in the control resource set, and the PDCCHs that may appear are called PDCCH candidates. At the same time, the candidate PDCCH that the terminal device needs to monitor is called a search space (search space). The PDCCH can support different aggregation levels (AL). The aggregation level indicates the number of CCEs occupied by one PDCCH. For example, the aggregation level supported by the PDCCH may include {1, 2, 4, 8, 16}, and so on. Among them, the candidate PDCCH set corresponding to a certain aggregation level is referred to as a search space under the aggregation level. The candidate PDCCH for multiple aggregation levels may also be referred to as a search space set. The "search space" and "search space set" in the embodiments of the present application can be used equivalently. Unless otherwise specified, the search space is used as an example for description in the embodiments of the present application.

At the same time, in the fifth generation mobile communication system, the concept of bandwidth part (BWP) is defined. The BWP refers to a group of continuous resource block (RB) resources on the carrier. Among them, multiple BWPs can be configured on each carrier (CC) of a terminal device, and there is only one activated BWP in a carrier at a time. The activated BWP is used to actually send or receive data. Each BWP will be configured with a control resource set and SS. Each SS and CORESET has a corresponding number (for example, the numbers after SS and CORESET in Figure 3 indicate their corresponding numbers.). An SS will be associated with a CORESET. For example, as shown in FIG. 3, the terminal device side is configured with three carrier units, namely CC0, CC1, and CC2, and each carrier unit is configured with four BWPs, namely BWP1, BWP2, BWP3, and BWP4, each Under BWP, control resource sets CORESET and SS are respectively configured. For example, the activated BWP in CC0 is BWP1, the activated BWP in CC1 is BWP2, and the activated BWP in CC2 is BWP3. For the activated BWP, please refer to the oblique line filling part in FIG.

In the embodiment of the present application, taking CC0 scheduling CC1 as an example, two PDCCHs are transmitted in the control resource set of CC0, which are a first PDCCH and a second PDCCH, respectively. The first PDCCH is used to schedule the PDSCH transmitted on the BWP2 of CC1, and the second PDCCH is used to schedule the PDSCH transmitted on the BWP1 of CC0 as an example. The process of the embodiment of the present application is described in detail:

In the embodiment of the present application, the terminal device may separately calculate the first resource position of the first PDCCH and the second resource position of the second PDCCH, respectively at the first resource position of the first PDCCH and the second resource position of the second PDCCH Blind inspection.

Specifically, the terminal device may sequentially monitor and activate SS1, SS2, and SS3 configured under BWP1. Taking terminal device monitoring SS1 as an example, the process of monitoring SS2 and SS3 is similar to the process of monitoring SS1.

When monitoring the SS1, the terminal device may use the following formula 1 to calculate the first resource position of the first PDCCH and the second resource position of the second PDCCH, respectively.

When calculating the second resource position of the second PDCCH, the parameter n _CI in formula 1 takes the value 0, and the parameter s takes the value SS1. When calculating the first resource position of the first PDCCH, the parameter n _CI in Formula 1 is the value of the carrier indicator field (CIF) configured by the network device for CC1 that is scheduled across carriers, for example, the network device is configured for CC1 The value of CIF is 1, the value of the corresponding parameter n _CI is 1, and the value of parameter s is SS1. However, it can be seen from Figure 3 above that SS1 is not configured for the currently activated BWP2 in CC1. To this end, a solution is proposed: according to the number of the SS in the scheduling cell, the SS with the same number in the scheduled cell may be found. The problem may be that the SS found is not the SS configured on the BWP activated by the scheduled cell. For example, the above example is still used. When the terminal device monitors the SS1 configured by activating BWP1 in CC0, if you want to calculate the resource location of the PDCCH serving CC1, you can find SS1 in CC1. The configuration is not in the configuration that activates BWP2, so this solution may not work. Based on the above, the present application provides a communication method. The principle of the method is to establish an association relationship between a search space in a scheduled cell and a search space in a scheduled cell, and use the scheduled cell search when calculating the PDCCH resource position of the scheduled cell The correlation between the space and the search space of the scheduled cell obtains the corresponding calculation parameters. For example, the example shown in FIG. 3 is still used to establish the association between SS1 in CC0 activating BWP1 and SS5 in CC1 activating BWP2. During the monitoring of SS1 by the terminal device, the SS5 associated with SS1 is used to calculate the above The first resource position of a PDCCH is the resource position of the PDCCH served by the scheduled cell CC1.

For ease of understanding, a description of related concepts of the present application is given for reference as follows:

1) The network device may be a device in the network that connects the terminal device to the wireless network. The network device is a node in the wireless access network, and may also be called a base station, and may also be called a radio access network (radio access network (RAN) node (or device). At present, some examples of network equipment are: gNB, transmission reception point (TRP), evolved Node B (evolved Node B, eNB), home base station (eg, home evolved Node B, or home Node B, HNB) , Baseband unit (BBU), or WiFi access point (AP), etc. In addition, in a network structure, the network device may include a centralized unit (CU) node and a distributed unit (DU) node. This structure splits the protocol layer of the eNB in the long term evolution (LTE) system, part of the protocol layer functions are centralized in the CU, and the remaining part or all of the protocol layer functions are distributed in the DU. Centralized control of DU.

2) Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a way to provide users with voice and / or data connectivity Devices, such as handheld devices and car-mounted devices with wireless connectivity. At present, some examples of terminals are: mobile phones, tablets, laptops, PDAs, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, and augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, self-driving wireless terminals, wireless terminals in remote medical surgery, and smart grids Wireless terminals, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.

3) PDCCH, a downlink control channel sent by a network device (such as a base station) to a terminal device, which is mainly used for one or more of the following various functions: (1) Send downlink scheduling information to the terminal device. The downlink scheduling information is also This is called downlink (DL, assignment) information. The downlink scheduling information includes the transmission parameters of the PDSCH so that the terminal device receives the PDSCH. Among them, PDSCH is used to carry the downlink data sent by the network device to the terminal device; (2) Send uplink scheduling information to the terminal device, the uplink scheduling information is also called uplink grant (UL, grant) information, and the uplink scheduling information includes PUSCH transmission parameters, so that the terminal device sends PUSCH to the network device. Among them, the PUSCH is used to carry the uplink data sent by the terminal device to the network device; (3) send an aperiodic channel quality indicator (CQI) report request; (4) send an uplink power control command, the uplink power The control command is used by the terminal device to determine the transmission power of the upstream channel; (5) carries information about the hybrid automatic repeat request (HARQ); (6) carries the wireless network temporary identifier (RNTI) Information, RNTI information may be implicitly included in cyclic redundancy check (cyclic redundancy check, CRC), and the RNTI information is used by the terminal device to determine whether the PDCCH sent by the network device is addressed to itself.

The information carried in the PDCCH may be called downlink control information (DCI). A PDCCH may only carry DCI in one format, and the information carried in the DCI may vary according to the format of the DCI . DCI can indicate cell-level information, such as instructing terminal equipment to use system messages, wireless network temporary identifier (system information, radio, network identifier, RNTI, SI-RNTI), paging RNTI (paging RNTI, P-RNTI), or random access RNTI (radom access RNTI, RA-RNTI) scrambling, DCI can also indicate terminal equipment level information, such as instructing terminal equipment to use cell RNTI (cell RNTI, C-RNTI), configured scheduling RNTI (configured scheduling RNTI, CS-RNTI ) Or semi-persistent CSI RNTI (semi-persistent CSI RNTI, SP CSI-RNTI) scrambling.

The network device may simultaneously send multiple PDCCHs on a control area in a cell, and the multiple PDCCHs may carry the same or different control information, including scheduling information of downlink data or scheduling information of uplink data, that is, the scheduling information The downlink data of the terminal device can be scheduled, and the uplink data of the terminal device can also be scheduled. In addition, the network device can schedule multiple terminal devices in a control area, and each scheduling information is transmitted on an independent PDCCH.

One PDCCH can be mapped to one or more CCEs for transmission, and it can also be said that one PDCCH can include one or more CCEs in the time-frequency resource. Among them, a CCE is composed of multiple resource element groups (resource element groups (REG), for example, a CCE is composed of 6 REGs, and 1 REG is during an orthogonal frequency division multiplexing (OFDM) symbol period Equal to 1 resource block (resource block, RB). The CCE index of the first CCE occupied by the PDCCH is called nCCE.

Table 1 Aggregation levels supported by PDCCH

As shown in Table 1, the PDCCH may support different aggregation levels (AL). For example, the aggregation levels supported by the PDCCH may include {1, 2, 4, 8, 16} and so on. The aggregation level represents the number of consecutive CCEs occupied by one PDCCH. For example, as shown in Table 1, if the aggregation level supported by the PDCCH is 4, it means that the PDCCH occupies 4 consecutive CCEs. In practical applications, the network device will determine the aggregation level used by the current PDCCH according to factors such as channel quality. For example, if the PDCCH is sent to a terminal device with good downlink channel quality (for example, a terminal device located in the center of the cell), the network device may use 1 CCE to send the PDCCH; For a terminal device (for example, a terminal device located at the edge of a cell), the network device may use 8 CCEs or even 16 CCEs to send the PDCCH to achieve sufficient robustness.

4) BWP is a group of continuous RB resources on the carrier. The new radio access technology (NR) version 15 stipulates that for a terminal, a serving cell can be configured with up to 4 BWPs, of which, frequency division duplex (frequency division duplexing, FDD) ) Downstream, upstream and downstream can be configured with 4 BWP each, under time division duplex (time division duplexing, TDD), upstream and downstream can be configured with 4 BWP each. At any time, only one BWP can be activated, and terminal devices and network devices send and receive data on the activated BWP. As shown in # 1 of FIG. 4, within the carrier broadband (BW), only one BWP may be supported, and the bandwidth of the BWP is less than or equal to the UE bandwidth capability (UE bandwidth capability), and the UE bandwidth capability is less than or equal to the carrier bandwidth ( carrier BW). As shown in # 2 of FIG. 4, in the carrier bandwidth, two BWPs can be supported, namely BWP1 and BWP2, and the bandwidths of BWP1 and BWP2 overlap. As shown in # 3 of Figure 4, in the carrier bandwidth, two BWPs can be supported, namely BWP1 and BWP2, and BWP1 and BWP2 do not overlap.

5) CORESET is a piece of time-frequency resource in the control area. One CORESET corresponds to one or a group of user equipment. For example, as shown in FIG. 2, CORESET1 may correspond to UE1, UE2, UE3, and UE4, and PDCCH of UE1, UE2, UE3, and UE4 may be sent on CORESET1. CORESET2 may correspond to UE5, UE6, UE7, and UE8, and the PDCCH of UE5, UE6, UE7, and UE8 may be sent in CORESET2. A UE may also correspond to multiple CORESETs, and the parameter sets on these CORESETs may be the same or different.

6) Candidate PDCCH. For the terminal device, the number of CCEs to which each PDCCH is mapped varies and there is no signaling, so the terminal device has to perform blind detection on all possible aggregation level candidate PDCCHs. In order to reduce the number of blind inspections and the complexity of blind inspection of terminal devices, the system can predefine the aggregation level set. For example, an aggregation level set {1,2,4,8,16} can be defined. The network device may use 1, 2, 4, 8, or 16 CCEs to send the PDCCH. Correspondingly, the terminal device can PDCCH with

aggregation level

1, 2, 4, 8 or 16 is blindly checked to confirm whether there is a PDCCH sent to itself. In order to further reduce the number of blind detections and the complexity of blind detection of terminal devices, the system defines a series of possible locations for PDCCHs in the control resource area for each aggregation level. The possible PDCCHs are called candidate PDCCHs (PDCCH candidate) .

7) Search space (search space, SS), the PDCCH set that the terminal device needs to monitor is called a search space. The set of candidate PDCCHs corresponding to a certain aggregation level may be referred to as a search space under the aggregation level, and may be recorded as {S (k)}. Among them, L represents the aggregation level, and k represents the sequence number of the candidate PDCCH under the aggregation level L. For example, when L takes 2 and k takes 2, {S2 (2)} indicates that there are two candidate PDCCHs at the aggregation level L = 2, and the two candidate PDCCHs can be expressed as S0 (2) and S1 (2).

The search space is divided into a common search space (common search space, CSS) and a UE-specific search space (UE-specific search space, USS). CSS is used to transmit control information related to paging, access at any time (RAdom Response, RA Response), broadcast control channel (broadcast control channel, BCCH). The control information is mainly public information at the cell level. The information is the same for all UEs. USS is used to transmit control information related to downlink shared channel (downlink shared channel (s), DL-SCH) and uplink shared channel (uplink shared channel (s), UL-SCH), etc. The control information is mainly UE level information .

8) PDCCH blind detection: Since the number of CCEs mapped by each PDCCH may vary, and there is no signaling, the terminal device needs to perform blind detection on the PDCCH in the control resource set. At the same time, because the terminal device does not know which aggregation level the PDCCH uses, the terminal device will perform blind detection on the PDCCH separately according to different aggregation levels.

For example, as shown in Table 2, assume that for the common search space CSS, the terminal device needs to perform PDCCH blind detection according to AL = 4 and AL = 8, respectively. When AL = 4 blind detection, the size of the control area of 16 CCEs (such as CORESET), needs to be blindly checked 4 times, that is, there are 4 candidate PDCCHs; when AL = 8 blind detection, 16 CCEs need blind detection 2 times, that is, there are 2 candidate PDCCHs; it can be seen that for the common space CSS, there are 4 + 2 = 6 candidate PDCCHs. For the UE-specific search space USS, it is assumed that the terminal device needs to perform blind PDCCH detection according to AL = 1, AL = 2, AL = 4, and AL = 8, respectively. It can be seen from Table 2 that when the blind test is performed according to AL = 1, 6 CCEs need to be blindly checked 6 times, that is, there are 6 candidate PDCCHs; when the blind test is performed according to AL = 2, 12 CCEs need to be blindly tested 6 times, That is, there are 6 candidate PDCCHs; when AL = 4 blind detection, 8 CCEs need to be blinded twice, that is, there are 2 candidate PDCCHs; when AL = 8 blind detection, 16 CCEs need to be blinded twice, That is, there are 2 candidate PDCCHs; it can be seen that for the UE-specific search space USS, there are 6 + 6 + 2 + 2 = 16 candidate PDCCHs.

Table 2 Examples of candidate PDCCH configurations that terminal equipment needs to monitor

9) Self-scheduling

Self-scheduling means that the PDSCH on a carrier is scheduled by the PDCCH sent on that carrier. For example, as shown in FIG. 5, the PDSCH on the primary cell (PCell) can be scheduled by the PDCCH sent from the PCell, the PDSCH on the secondary cell (SCell) 1 can be scheduled by the PDCCH sent on the SCell 1, and the SCell2 The PDSCH is scheduled by the PDCCH sent on SCell2.

10) Cross-carrier scheduling

Cross-carrier scheduling based on a carrier indicator field (CIF) allows a PDCCH of one serving cell to schedule radio resources on another serving cell. Among them, the cell used to transmit the PDCCH is called a scheduling cell, and the cell with scheduled resources is called a scheduled cell. As shown in Figure 6, PCell can schedule the radio resources on SCell1. As shown in FIG. 7, SCell2 can schedule the radio resources on SCell1. It should be noted that PCell will not be scheduled by other carriers, and the SCell may be configured to schedule other SCell carriers or may be configured to be scheduled by other SCell carriers.

11) Parameter set (numerology)

The parameter set may include subcarrier spacing, symbol length, time slot length, and cyclic prefix (CP) type. Table 3 shows an example of various parameter sets currently supported by NR.

Table 3 Transmission parameter set

12) Time domain resource location of PDCCH: Also known as PDCCH monitoring opportunity (PDCCH monitoring opportunity), PDCCH monitoring opportunity is a time unit for monitoring PDCCH, and the PDCCH monitoring opportunity can be determined according to relevant parameters in the search space SS. For example, the PDCCH monitoring timing may be jointly determined according to the four parameters of the PDCCH monitoring period, the PDCCH monitoring offset, the PDCCH monitoring mode, and the number of consecutive time slots monitored by the PDCCH in the search space.

For example, as shown in FIG. 8, the configuration parameters in the search space indicate that the monitoring period of the PDCCH is 2 slots, and the offset value is 1 slot. Therefore, the monitoring slots of the PDCCH are slot1, slot3, slot5, slot7 and slot9. For each monitoring time slot, a 14-bit binary number can be used to indicate, for example, the 14-bit binary number can be 00001000001000, where 1 represents monitoring and 0 represents no monitoring. It can be determined that symbol 4, symbol 5, symbol 10 and symbol 11 can be monitored in sequence for each monitoring time slot. Regarding the monitoring time slot and the monitoring symbol, please refer to the hatched part in FIG. 8.

13) Carrier aggregation (CA) is a technology that aggregates at least two carrier units (CC) to support larger transmission bandwidth. To efficiently use fragmented spectrum, carrier aggregation supports aggregation between different carrier units, for example, aggregation of carrier units within the same or different bandwidths, or aggregation between adjacent or non-adjacent carrier units within the same frequency band, or, different Aggregation between carrier units in the band, etc. In addition, it should be understood that in the description of this application, the words "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance, nor as an indication. Or suggest the order.

It can be understood that, because a cell includes only one downlink carrier, the "cell" and the "carrier" in the embodiments of the present application can be used equivalently. Unless otherwise specified, the carrier in the embodiment of the present application is the following carrier as an example for description.

As shown in FIG. 9, the present application provides a flow of a communication method. The execution subject of the flow may be a terminal device or a network device. In the embodiments of the present application, the terminal device is taken as an example to explain. It can be understood that the function of the network device can also be realized by a chip applied to the network device, or by other means to support the network device; the function of the terminal device can also be realized by the chip applied to the terminal device, or by Other devices to support terminal equipment implementation. The process can be:

S901. The terminal device determines a first SS that activates BWP in the first cell.

The terminal device may determine the second SS that activates the BWP of the second cell, and determine the first SS according to the correspondence between the second SS and the first SS.

Optionally, when the terminal device is configured with multiple BWPs in a cell, the configuration information may include sequence number information for the first activation of the BWP, that is, the BWP ID for the first activation. When the terminal device works in a single cell, the first activated BWP is the BWP corresponding to the first activated BWP ID in the configuration information, and then the network side can change the current through the downlink control information DCI or the terminal device through the internal BWP deactivation timer The information to activate BWP may also be called BWP handover. When the terminal device works in carrier aggregation, only the activated cell in the cell configured by the network for the terminal device will be used for data transmission, that is, only the activated cell will have the activated BWP. In carrier aggregation, the primary cell is always activated, and the secondary cell activates and deactivates the cell through control signaling. For the activated cell, the first activated BWP is the BWP corresponding to the first activated BWP ID in the cell configuration information, and then the network side can change the currently activated BWP information through the downlink control information DCI or the terminal device through the internal BWP deactivation timer, It can also be called BWP switching. Therefore, regardless of whether it is a scheduled cell or a scheduled cell, the terminal device knows which BWP on the cell is the active BWP.

S902. The terminal device determines the resource position of the first PDCCH according to the first SS.

The first PDCCH is used to send control information of the first cell. For information about which control information the first PDCCH is specifically used to send the first cell, refer to the description in the above concept explanation section 3) PDCCH. The resource position of the first PDCCH is located in the resources of the second cell, and the first cell is different from the second cell.

The resource location of the first PDCCH includes the frequency domain resource location of the first PDCCH and the time domain resource location of the first PDCCH. The frequency domain resource position of the first PDCCH may be located in the CORESET associated with the second SS of the second cell that activates the BWP. For the CORESET, refer to the above concept explanation section 5) The record in the CORESET For the location of the domain resource, please refer to the above concept explanation section 11) The record of the location of the time domain resource of the PDCCH. The first SS includes the number of candidate PDCCHs. For the candidate PDCCHs, please refer to the description of the concept explanation section 6) Candidate PDDCH.

S903. The terminal device detects the first PDCCH in the resource position of the first PDCCH. For example, the terminal device may perform PDCCH blind detection in the resource position of the first PDCCH. For the process of PDCCH blind detection, refer to the above concept explanation Part 8) Recording of PDCCH blind detection.

As shown in FIG. 10, the present application provides a flow of a communication method, and the execution subject of the flow may be a terminal device or a network device. In the embodiments of the present application, the terminal device is taken as an example to explain. The process is as follows:

S1001: For the second SS in the activated BWP of the second cell, the terminal device determines the first SS in the activated BWP of the first cell.

The terminal device may determine the first SS according to the correspondence between the second SS and the first SS.

S1002. The terminal device determines the resource position of the first PDCCH according to the first SS.

S1003. The terminal device detects the first PDCCH in the resource position of the first PDCCH.

Alternatively, S903 or S1003 may also be described as: the terminal device receives the first PDCCH in the resource position of the first PDCCH, or the terminal device monitors (monitor) in the resource position of the first PDCCH The first PDCCH.

It can be understood that, if the flow shown in FIG. 9 or FIG. 10 is applied to the network device side, the execution process of step S903 or step S1003 may be replaced by: the network device sends the resource location of the first PDCCH. The first PDCCH. For example, there may be multiple candidate resource positions of the first PDCCH, and the network device may send the first PDCCH in one of the candidate resource positions of the first PDCCH according to the channel quality at each resource position.

It should be noted that, in the embodiment of the present application, the first cell may correspond to the first CC, and the second cell may correspond to the second CC. Therefore, in the above flow shown in FIG. 9 or FIG. 10, the first cell may be replaced by the first CC for description, and the second cell may be replaced by the second CC for description. For example, the replaceability description of S901 is: terminal The device determines the first SS that activates the BWP of the first CC.

In the embodiment of the present application, one or more first SSs may be configured in the activated BWP of the first cell, and one or more second SSs may be configured in the activated BWP of the second cell. The first SS and the second SS The SS may include at least the number of candidate PDCCHs at a certain aggregation level. Specifically, the number of candidate PDCCHs included in the first SS configured on different BWPs of the first cell may be the same or different. Compared with the scheme that the number of candidate PDCCHs included in the first SSs of different BWPs in the first cell must be the same, the configuration flexibility can be improved.

Optionally, CORESET configuration can also be performed in the activated BWP of the second cell, and CORESET configuration can not be performed in the activated BWP of the first cell, or even if the CORESET configuration is performed in the activated BWP of the first cell, the terminal device Do not use. The types of the first SS and the second SS may both be USS.

It can be seen from the above that in the embodiment of the present application, the flexible association between the first SS and the second SS can be achieved through lower signaling overhead, thereby achieving flexible cross-carrier scheduling.

In the embodiment of the present application, the following formula (2) or formula (3) may be used to calculate the resource position of the first PDCCH:

In an example, if only the number of candidate PDCCHs is included in the first SS, and the time domain configuration parameters that determine the time domain resource location of the PDCCH are not included, the resource location of the first PDCCH may be calculated using the above formula 2. If the first SS includes both the number of candidate PDCCHs and the time domain configuration parameters that determine the position of the PDCCH time domain resources, the resource position of the first PDCCH can be calculated using the above formula 3. The examples are not meant to limit the application. For example, if the first SS includes both the number of candidate PDCCHs and the time domain configuration parameters that determine the position of the PDCCH time domain resource, the above formula 2 can also be used to calculate the resource position of the first PDCCH.

In Formula 2 or Formula 3, L represents the aggregation level of the first PDCCH, and L is an integer greater than or equal to 0. For example, the value of L may be 1, 2, 4, 8, 16 or Other values. s _m represents the second SS. s _n represents the first SS. p represents the CORESET associated with the second SS. n _CI represents the CIF of the first cell. μ represents the parameter set corresponding to the BWP where the second SS is located.

with

It represents the time domain resource position of the first PDCCH, for example, the time slot where the first PDCCH is located.

When the time domain resource position of the first PDCCH is

It is determined based on a second SS s _m. Said

When the time-frequency resource position of the first PDCCH is

It is determined based on a first s _n.

Indicates the sequence number of the candidate PDCCH in the first SS s _n . N _{CCE, p} p is the number of the CCE control resources included in the associated second set SS s _m. Said

Indicates when the aggregation level is L, the second cell is scheduled to activate or all of the first cell can be scheduled in a BWP, the corresponding s _m s _n, the maximum value of the number of PDCCH candidates comprise . The value of i is greater than or equal to 0, and less than or equal to L-1.

Specifically, in Formula 2 and Formula 3, when the second SSs _m is CSS,

Is 0, and when the second SS s _m is USS, it can be calculated by the following formula 5

Specifically, when the first SS s _n is CSS,

The value is 0. When the first SS s _n is USS, the following formula 6 can be used to calculate

Among them, in Formula 5 and Formula 6, Y _{p, -1} = n _RNTI ≠ 0; when p mod 3 = 0, A _p = 39827; when p mod 3 = 1, A _p = 39829; when p mod When 3 = 2, A _p = 39839; D = 65537.

In the embodiment of the present application, the corresponding relationship between the second SS and the first SS may satisfy the following relationship:

Example 1: A first SS is configured in the activated BWP of the first cell, and one or more second SSs are configured in the activated BWP of the second cell. The first SS may correspond to all the first SSs configured in the activated BWP of the second cell二 SS.

Taking the second cell as the scheduling cell and the first cell as the scheduled cell as an example, the description will be made. As shown in FIG. 11, CC0 represents a scheduled cell, and CC1 represents a scheduled cell. Among them, 4 BWPs are configured in CC0 and CC1, namely BWP1, BWP2, BWP3 and BWP4. The activated BWP in CC0 is BWP1 and the activated BWP in CC1 is BWP2. For the activation of BWP, please refer to the oblique line in FIG. 11 Fill part.

One or more SSs and one or more CORESETs can be configured under each BWP in the scheduling cell CC0, and each SS is associated with a CORESET. For example, SS configured under BWP1 may include SS1, SS2, and SS3, configured CORESET may include CORESET1 and CORESET2, SS1 may be associated with CORESET1, and SS2 and SS3 may be associated with CORSET2. Of course, the above example is only an exemplary description and is not intended to limit the embodiments of the present application. For example, SS1, SS2, and SS3 may all be associated with CORESET1, or SS1, SS2, and SS3 may all be associated with CORESET2.

An SS can be configured under each BWP in the scheduled cell CC1, and CORESET is not configured, or even if CORESET is configured, the terminal device is not used. In FIG. 11, an example is described in which CORESET is not configured in the scheduled cell CC1. The number of candidate PDCCHs included in SSs configured under different BWPs of the scheduled cell CC1 may be the same or different. For example, the number of candidate PDCCHs included in SS7, SS13, SS2, and SS8 may be the same or different.

In the embodiment of the present application, a correspondence relationship between SS1, SS2, and SS3 in the activated BWP1 in the scheduling cell CC0 and SS13 in the activated BWP2 in the scheduled cell CC1 may be established. When the terminal device calculates the resource position of the first PDCCH of the scheduled cell CC1 (also referred to as the resource position of the candidate PDCCH), the number of candidate PDCCHs configured in SS13 can be used for calculation.

The resource position of the first PDCCH can be calculated using the above formula 2 or formula 3. For example, if the terminal device SS1 in the monitoring scheduling cell CC0, in the above formula 2 or formula 3, s _m values may SS1, s _n values may SS13, CORESET1 set associated with SS1, The value of p is CORESET1. In the embodiment of the present application, as shown in Table 4a, when the aggregation level is 2, it is set that in the scheduling cell CC0, 2 candidate PDCCHs are configured in SS1 configured in BWP1, and 4 in SS4 configured in BWP2 One candidate PDCCH, one candidate PDCCH is configured in SS7 configured under BWP3, and five candidate PDCCHs are configured in SS9 configured under BWP4. In the scheduled cell CC1, two candidate PDCCHs are configured in SS7 configured in BWP1, three candidate PDCCHs are configured in SS13 configured in BWP2, four candidate PDCCHs are configured in SS2 configured in BWP3, and SS8 configured in BWP4 1 candidate PDCCH. When BWP1 is activated in the scheduling cell CC0 and BWP2 is activated in the scheduled cell CC1,

The value is the larger of the number of candidate PDDCHs included in SS1 in BWP1 (two candidate PDCCHs) in the scheduled cell CC0 and the number of candidate PDCCHs (3 candidate PDCCHs) in SS13 in activated BWP2 in the scheduled cell CC1 value,

The value is 3. When the aggregation level is 4, determine

The process is similar to the above and will not be described again.

Table 4a Candidate PDCCH number configuration table

It should be noted that at this time

S _m corresponds to the second cell activation in CC0 BWP (BWP1) of SS1. The bold BWP in the table indicates the BWP activated in the cell. SS13 is a search space corresponding to SS1 in the first cell CC1 activating BWP (BWP2).

Table 4b Configuration table of the number of candidate PDCCHs

Table 4b shows an example in which one second cell (scheduling cell) schedules two first cells (scheduled cells). To simplify the description, Table 5 only shows the configuration values of the number of candidate PDCCHs corresponding to BWP activation. among them

The value of is the maximum configuration value of the number of candidate PDCCHs in all activated BWPs in the three cells. That is, according to Formula 2 or Formula 3 or Formula 7, when calculating the positions of the candidate PDCCHs of the second cell and each first cell, the second cell and all first cells scheduled by the second cell need to be used The configuration value of the number of candidate PDCCHs in the medium, instead of considering only the configuration value of the number of candidate PDCCHs in the second cell and a first cell. Example 2: N first SSs are configured in the activated BWP of the first cell, and M second SSs are configured in the activated BWP of the second cell, both M and N are positive integers greater than or equal to 1, and the M Less than or equal to N, the M second search spaces correspond to the M first search spaces one-to-one.

The N first SSs configured in the BWP activated by the first cell and the M second SSs configured in the BWP activated by the second cell may be sorted according to certain rules, and a one-to-one correspondence is established. For example, the first SS and the second SS may be sorted in ascending order or descending order, and a one-to-one correspondence may be established.

For example, the second cell is the scheduling cell CC0, SS1, SS2, and SS3 are configured in the activated BWP1 of the scheduling cell CC0, the first cell is the scheduled cell CC1, and SS1, SS2, and SS6 are configured in the activated BWP2 of the scheduled cell. For example, as shown in FIG. 12, the correspondence between SS1 and SS1, the correspondence between SS2 and SS2, and the correspondence between SS3 and SS6 can be established. When the activated BWP in the scheduled cell CC0 is switched, if the number of SSs configured for the activated BWP after the handover is less than the number N of SSs configured in the activated BWP in the scheduled cell CC1, the activated BWP in the scheduled cell CC1 There is no corresponding SS for excess SS. For example, as shown in FIG. 12, when the activated BWP in CC0 is switched and BWP1 is switched to BWP3, then the corresponding relationship between SS7 and SS1, the corresponding relationship between SS8 and SS2, and the SS6 without a corresponding SS can be established.

The resource position of the first PDCCH can be calculated using the above formula 2 or formula 3. In conjunction with the example shown in FIG. 12, the resource position of the first PDCCH can also be referred to as the candidate PDCCH position served by the scheduled cell CC1. When Equation 2 or Equation 3, and s _n s _m values need to satisfy the above correspondence relationship, for example, when the scheduling cell CC0 s _m is selected on the SS1 CC0BWP1, scheduled cell CC1 is to choose s _n SS1 on BWP2; when scheduling cell s _m is selected SS2 on CC0BWP1, scheduled cell CC1 to choose s _n is SS2 on CC1BWP2; when scheduling cell s _m is selected SS3 on CC0BWP1, scheduled cell CC1 is necessary to select a s _n on SS6 CC1BWP2.

Example 3: N first SSs are configured in the activated BWP of the first cell, and M second SSs are configured in the activated BWP of the second cell. Both M and N are positive integers greater than or equal to 1, and M is greater than or equal to 1. Is equal to N. The correspondence relationship between the M first SSs and the M second SSs may be established according to the manner provided in the foregoing example two, and any one of the first SSs may be corresponding to the M-N second SSs.

For example, as shown in FIG. 13, the second cell is the scheduling cell CC0, SS1, SS2, and SS3 are configured in the activated BWP1 of the scheduling cell CC0, the first cell is the scheduled cell CC1, and SS4 and SS5 are configured in the activated BWP1. The corresponding relationship between SS1 and SS4 can be established, the corresponding relationship between SS2 and SS5 can be established, the corresponding relationship between SS3 and SS4 can be established for SS3, and the corresponding relationship between SS3 and SS5 can also be established. In the example shown in FIG. The corresponding relationship of SS5 is described as an example and is not intended to limit the application, and when the activated BWP of CC1 is switched, the corresponding relationship between different SSs can be re-established, for example, when the activated BWP of CC1 is switched to BWP3 , You can re-establish the correspondence between SS1 on CC0 and SS3 on CC1, the correspondence between SS2 on CC0 and SS8 on CC1, and the correspondence between SS3 on CC0 and SS9 on CC1. It can be seen that in the embodiment of the present application, the SS configuration of the scheduled carrier when the base station performs cross-carrier scheduling is simple and flexible, and can support arbitrary BWP switching between the scheduled cell and the scheduled cell.

Example 4: N first SSs are configured in the activated BWP of the first cell, and M second SSs are configured in the activated BWP of the second cell, both M and N are positive integers greater than or equal to 1, and the first The search space and the second search space satisfy the following correspondence: j = i mod N;

The terminal device may sort the M second SSs according to the first rule, where i represents the sequence number of the M second search spaces after sorting, and the value of i is greater than or equal to 0 and less than or equal to M-1, or, the value of i is greater than or equal to 1, less than or equal to M. The terminal device may sort the N first SSs according to the second rule, where j represents the sequence number of the N first search spaces after sorting, and the value of j is greater than or equal to 0 and less than or equal to N-1, or, the value of j is greater than or equal to 1, less than or equal to N. The first rule and the second rule may be specifically arranged in ascending order or descending order according to the SS sequence number, which is not limited in this application.

For example, M takes a value of 5, N takes a value of 2, the second cell is a scheduling cell CC0, and the first cell is a scheduled cell CC1. In CC0, activate SS3, SS1, SS7, SS5, and SS2 in BWP1, and activate SS8 and SS5 in BWP2 in CC1. It can be understood that the aforementioned SS3, SS1, SS8, etc. refer to the serial number ID of the SS. For example, SS3 may specifically refer to SS ID = 3, and other descriptions are similar and will not be described again.

The SSs configured in the activated BWP1 in CC0 can be sorted in ascending order according to the SS ID, and the sorted SSs can range from 0 to 4 according to i, namely SS1, SS2, SS3, SS5, and SS7. Calculate the value of i from 0 to 4 in turn, according to j = i mod3. It can be seen from Table 5 that when i takes the value 0, the corresponding j takes the value 0; when i takes the value 1, the corresponding j takes the value 1; when i takes the value 2, the corresponding j takes the value 0; i takes When the value is 3, the corresponding j value is 1; when the i value is 4, the corresponding j value is 0.

Table 5 Search space of scheduling cell

According to the SS ID, the SSs configured in the activated BWP2 in CC1 are sorted in ascending order, and the sorted SSs range from 0 to 1 according to the value of j, namely SS5 and SS6. For details, see Table 6 below.

Table 6 Scheduled cell search space

被调度小区搜索空间indexSearch space index of scheduled cell	SS8SS8		SS 5SS 5
按照SS ID升序的方式进行搜索空间排序Sort search space in ascending order of SS ID		SS 5SS 5	SS 8SS 8
j j	00	11

It can be seen from Table 5 above that when i takes a value of 0, j takes a value of 0; when i takes a value of 1, j takes a value of 1; when i takes a value of 2, j takes a value of 0; when i takes a value of 3, j takes a value 1; when i takes the value 4, j takes the value 0. At the same time, it can be seen from Table 5 that when i takes a value of 0 to 4, it corresponds to SS1, SS2, SS3, SS5, and SS7 in turn. From Table 6, it can be seen that when j takes a value of 0 to 1, it corresponds to SS5 and SS8 in turn. Therefore, the corresponding relationship between the SS configured by activating BWP1 and the SS configured by activating BWP2 in the scheduled cell CC1 can be seen in Table 7 and FIG. 14 below.

Table 7 Mapping relationship between scheduled cell and scheduled cell search space

It should be noted that, in the embodiment of the present application, ascending sorting according to SS ID is used as an example for description, and is not intended to limit the embodiment of the present application. For example, the SS can be sorted in descending order according to the ID, or the SS can be sorted in other ways.

Optionally, in the embodiment of the present application, for the process shown in FIG. 9 or 10, the method may further include: determining a second search space in which the second cell activates BWP; and determining the second according to the second search space The resource position of the PDCCH. The second PDCCH is used to send control information of the second cell. The resource position of the second PDCCH is located in the resource of the second cell.

Specifically, the resource location of the second PDCCH includes the frequency domain resource location of the second PDCCH and the time domain resource location of the second PDCCH, and the frequency domain resource location of the second PDCCH may be specifically located in the second In the CORESET associated with the SS, the time domain resource position of the second PDCCH can be referred to the description of the above concept explanation section 11) the record of the time domain resource position of the PDCCH, and the second search space includes the number of candidate PDCCHs. Optionally, the second search space may further include time domain configuration parameters that determine the location of the PDCCH time domain resources.

In an example, the following formula 7 may be used to determine the resource position of the second PDCCH:

Wherein, L represents the aggregation level of the second PDCCH, the L is an integer greater than or equal to 0, the s _m denotes the second search space; p denotes the second search space associated with the Control resource set, the μ represents the parameter set corresponding to the BWP where the second search space is located, the

Represents the time-domain resource position of the second PDCCH, the

When the time-frequency resource position of the second PDCCH is

As shown in FIG. 15, in the embodiment of the present application, the CORSET associated with the second search space includes 24 CCEs, and the indexes are 0 to 23 in order. For a candidate PDCCH with an aggregation level L of 2, when 3 candidate PDCCHs are configured in the first SS, that is, the number of candidate PDCCHs configured in the first SS is 3, using the above formula 2 or formula 3, it can be calculated Three candidate PDCCH positions of the first PDCCH, where CCE2 and CCE3 correspond to one candidate PDCCH position, CCE10 and CCE11 correspond to one candidate PDCCH position, CCE18 and CCE19 correspond to one candidate PDCCH position, and the three candidate PDCCH positions for the first PDCCH can be See the dot filling part when L = 2 in FIG. 15. For a candidate PDCCH with an aggregation level L of 2, when two candidate PDCCHs are configured in the second SS, that is, the number of candidate PDCCHs configured in the second SS is 2, using the above formula 7, the second PDCCH can be calculated 2 candidate PDCCH positions, where CCE0 and CCE1 correspond to one candidate PDCCH position, and CCE8 and CCE9 correspond to one candidate PDCCH position. For the two candidate PDCCH positions of the second PDCCH, see the oblique line when L = 2 in FIG. 15 Fill part.

Similarly, for the candidate PDCCH whose aggregation level L is 4, when two candidate PDCCHs are configured in the first SS, use the above formula 2 or formula 3 to calculate the two candidate PDCCH positions of the first PDCCH, which may be specifically CCE4 To CCE7, and CCE12 to CCE15, where CCE4 to CCE7 correspond to a candidate PDCCH position, and CCE12 to CCE15 correspond to a candidate PDCCH position. For the two candidate PDCCH positions of the first PDCCH, please refer to FIG. 15 when L is 4 Fill the dots. For candidate PDCCHs with aggregation equal to L of 4, when one candidate PDCCH is configured in the second SS, using the above formula 7, one candidate PDCCH position of the second PDCCH can be calculated, and the second PDCCH candidate PDCCH position It may be specifically CCE0 to CCE3. For a candidate PDCCH position of the second PDCCH, refer to the oblique line filling part when L is 4 in FIG. 15.

It should be noted that for a terminal, there may be multiple scheduling cells (second cells), and each scheduling cell may have multiple scheduled cells (first cells). When one second cell schedules multiple first cells, each first cell can use the above formula 2 or formula 3 to calculate the candidate PDCCH position. Each second cell can use Equation 7 to calculate the candidate PDCCH position.

In the above embodiments provided by the present application, the methods provided by the embodiments of the present application are introduced from the perspectives of network devices, terminals, and interaction between network devices and terminals, respectively. In order to realize each function in the method provided by the embodiments of the present application, the network device and the terminal may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application of the technical solution and design constraints.

Similar to the above concept, as shown in FIG. 16, an embodiment of the present application further provides an apparatus 1600. The apparatus 1600 may include a processing module 1601 and a transceiver module 1602.

In the first example, the apparatus 1600 is used to implement the functions of the terminal device in the above method. The device may be a terminal device or a device in the terminal device. Among them, the device may be a chip system. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices.

The processing module 1601 is configured to determine the first search space of the active bandwidth part BWP of the first cell, and determine the resource location of the first physical downlink control channel PDCCH according to the first search space. The first PDCCH is used to send control information of the first cell, and the resource position of the first PDCCH is located in the resource of the second cell. The transceiver module 1602 is configured to receive the first PDCCH in the resource position of the first PDCCH. The first cell is different from the second cell.

In the second example, the apparatus 1600 is used to implement the functions of the network device in the above method. The device may be a network device or a device in the network device. Among them, the device may be a chip system.

The processing module 1601 is used to determine the first search space of the active bandwidth part BWP of the first cell and the resource position of the first physical downlink control channel PDCCH according to the first search space; the transceiver module 1602 is used to Sending the first PDCCH in the resource position of the first PDCCH.

For the specific execution process of the processing module 1601 and the transceiver module 1602, refer to the description in FIG. 9 or FIG. 10 above. The division of the modules in the embodiments of the present application is schematic, and is only a division of logical functions. In actual implementation, there may be another way of dividing. In addition, the functional modules in the embodiments of the present application may be integrated in one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module. The above integrated modules may be implemented in the form of hardware or software function modules.

Similar to the above concept, as shown in FIG. 17, the present application provides an apparatus 1700 for implementing the functions of the terminal device in the above method. The device may be a terminal device, or a device in the terminal device, or the device 1700 is used to implement the function of the network device in the above method. The device may be a network device or a device in the network device.

The apparatus 1700 includes at least one processor 1720, configured to implement the functions of the terminal device or the network device in the method provided by the embodiments of the present application. Exemplarily, the processor 1720 may determine the first search space of the activated bandwidth part BWP of the first cell, and determine the resource position of the first physical downlink control channel PDCCH according to the first search space, etc., for details, see the method example The detailed description in is not repeated here.

The device 1700 may further include at least one memory 1730 for storing program instructions and / or data. The memory 1730 and the processor 1720 are coupled. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 1720 may cooperate with the memory 1730. The processor 1720 may execute program instructions stored in the memory 1730. At least one of the at least one memory may be included in the processor.

The device 1700 may further include a communication interface 1710 for communicating with other devices through a transmission medium, so that the device used in the device 1700 can communicate with other devices. Illustratively, the communication interface 1710 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a terminal device or a network device. The processor 1720 uses the communication interface 1710 to send and receive data, and is used to implement the method in the embodiment corresponding to FIG. 9 or FIG. 10.

In this embodiment of the present application, the specific connection medium between the communication interface 1710, the processor 1720, and the memory 1730 is not limited. In the embodiment of the present application, in FIG. 17, the memory 1730, the processor 1720, and the communication interface 1710 are connected by a bus 1740. The bus is shown by a thick line in FIG. 17, and the connection between other components is only for schematic illustration. , Not to limit. The bus can be divided into an address bus, a data bus, and a control bus. For ease of representation, only a thick line is used in FIG. 17, but it does not mean that there is only one bus or one type of bus.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may be implemented or Perform the disclosed methods, steps, and logical block diagrams in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), for example Random access memory (random-access memory, RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device capable of realizing a storage function, which is used to store program instructions and / or data.

According to the method provided in the embodiment of the present application, as shown in FIG. 18, a communication system 1800 is further provided, including the foregoing network device 1801 and terminal device 1802. For example, the network device may determine the first search space of the active bandwidth part BWP of the first cell, and determine the resource position of the first physical downlink control channel PDCCH according to the first search space, in the resource position of the first PDCCH Sending the first PDCCH. The terminal device may determine the first search space of the active bandwidth part BWP of the first cell, determine the resource location of the first physical downlink control channel PDCCH according to the first search space, and receive the received location in the resource location of the first PDCCH The first PDCCH is described.

The methods provided 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 using software, it can 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 the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present invention are generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, a network device, user equipment, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmit to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as 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 including a server, a data center, and the like integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, digital video disc (DVD)), or a semiconductor medium (for example, SSD).

Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A communication method, characterized in that it includes:

Determine the first search space of the active bandwidth part BWP of the first cell;

According to the first search space, a resource position of a first physical downlink control channel PDCCH is determined, the first PDCCH is used to send control information of the first cell, and the resource position of the first PDCCH is located in a second cell Resources

The first PDCCH is detected in the resource position of the first PDCCH.
The method according to claim 1, wherein the determining the first search space of the activated BWP of the first cell comprises:

Determine a second search space for activating BWP of the second cell;

The first search space is determined according to the correspondence between the second search space and the first search space, and the resource position of the first PDCCH is located in a control resource set associated with the second search space.
The method of claim 2, wherein the number of the first search space is one, and the first search space corresponds to all second search spaces of the second cell.
The method according to claim 2, wherein the number of the first search spaces is N, the number of the second search spaces is M, and both M and N are positive values greater than or equal to 1 Integer, and the M is less than or equal to N, and the M second search spaces correspond to the M first search spaces one-to-one.
The method according to claim 2, wherein the number of the first search spaces is N, the number of the second search spaces is M, and both N and M are positive values greater than or equal to 1 Integer, the jth first search space and the ith second search space satisfy the following correspondence: j = i mod N;

Wherein, the value of i is greater than or equal to 0 and less than or equal to M-1, and the value of j is greater than or equal to 0 and less than or equal to N-1.
The method of claim 5, wherein the method further comprises:

According to the first rule, sort the M second search spaces, and i represents the sequence number of the M second search spaces after sorting;

According to the second rule, the N first search spaces are sorted, and j represents the sequence number of the N first search spaces after sorting.
The method according to any one of claims 1 to 6, wherein the resource position of the first PDCCH includes a frequency domain resource position of the first PDCCH and a time domain resource position of the first PDCCH, so The first search space includes greater than or equal to 1 candidate PDCCH;

For the first search space
Candidate PDCCH, the determining the resource position of the first PDCCH according to the first search space includes: determining the first
Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, and L is an integer greater than or equal to 0;

The sm represents the second search space;

The p represents a set of control resources associated with the second search space;

The μ represents the parameter set corresponding to the BWP where the second search space is located;

Said
Represents the time domain resource position of the first PDCCH;

Said
When the time domain resource position of the first PDCCH is
Time, the starting position parameter of the first PDCCH frequency domain resource position, the
It is determined based on the second search space s m;

The s n represents the first search space;

The n CI represents the carrier indication field CIF of the first cell;

Said
It denotes the first search space of PDCCH candidates s n in number;

The N CCE, p represents the number of control channel units CCE included in the control resource set p;

Said
Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled, the search space of s n and the second search space corresponding to s m, the number of PDCCH candidates included Maximum value

The value of i is greater than or equal to 0, and less than or equal to L-1.
The method according to any one of claims 1 to 6, wherein the resource position of the first PDCCH includes a frequency domain resource position of the first PDCCH and a time domain resource position of the first PDCCH, so The first search space includes greater than or equal to 1 candidate PDCCH;

For the first search space
Candidate PDCCH, the determining the resource position of the first PDCCH according to the first search space includes: determining the first
Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, and L is an integer greater than or equal to 0;

The s n represents the first search space;

The p represents a set of control resources associated with the second search space;

The n CI represents the carrier indication field CIF of the first cell;

The μ represents the parameter set corresponding to the BWP where the first search space is located;

Said
Represents the time domain resource position of the first PDCCH;

Said
When the time-frequency resource position of the first PDCCH is
Time, the starting position parameter of the frequency domain resource position of the first PDCCH, the
Is determined according to the first search space s n ;

Said
It denotes the first search space of PDCCH candidates s n in number;

The N CCE, p represents the number of control channel units CCE included in the control resource set p;

Said
Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled, the search space of s n and the second search space corresponding to s m, the number of PDCCH candidates included Maximum value

The value of i is greater than or equal to 0, and less than or equal to L-1.
The method according to any one of claims 1 to 8, wherein the method further comprises:

Determining a second search space in which the second cell activates BWP;

Determining a resource position of a second PDCCH according to the second search space, the second PDCCH is used to send control information of the second cell, and the resource position of the second PDCCH is located in the resource of the second cell .
The method according to claim 9, wherein the resource position of the second PDCCH includes a frequency domain resource position of the second PDCCH and a time domain resource position of the second PDCCH, and the second search space Including a candidate PDCCH greater than or equal to;

For the candidate PDCCH
Candidate PDCCHs, and determining the resource position of the second PDCCH according to the second search space includes: determining the
Resource positions of PDCCH candidates:

Where L represents the aggregation level of the second PDCCH, and L is an integer greater than or equal to 0;

The sm represents the second search space;

The p represents a set of control resources associated with the second search space;

The μ represents the parameter set corresponding to the BWP where the second search space is located;

Said
Indicates the time domain resource position of the second PDCCH;

Said
When the time-frequency resource position of the second PDCCH is
Time, the starting position parameter of the second PDCCH frequency domain resource position, the
It is determined based on the second search space s m;

The n CI represents the carrier indication field CIF of the second cell;

Said
It denotes the number of PDCCH candidates in the second search space s m;

The N CCE, p represents the number of control channel units CCE included in the control resource set p;

Said
Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled in the second search space corresponding to s m search space, the maximum number of PDCCH candidates included ;

The value of i is greater than or equal to 0, and less than or equal to L-1.
A communication method, characterized in that it includes:

Determine the first search space of the active bandwidth part BWP of the first cell;

According to the first search space, a resource position of a first physical downlink control channel PDCCH is determined, the first PDCCH is used to send control information of the first cell, and the resource position of the first PDCCH is located in a second cell Resources

Sending the first PDCCH in the resource position of the first PDCCH.
The method according to claim 11, wherein the determining the first search space of the activated BWP of the first cell comprises:

Determine a second search space for activating BWP of the second cell;

The first search space is determined according to the correspondence between the second search space and the first search space, and the resource position of the first PDCCH is located in a control resource set associated with the second search space.
The method of claim 12, wherein the number of the first search space is one, and the first search space corresponds to all second search spaces of the second cell.
The method according to claim 12, wherein the number of the first search spaces is N, the number of the second search spaces is M, and both M and N are positive values greater than or equal to 1 Integer, and the M is less than or equal to N, and the M second search spaces correspond to the M first search spaces one-to-one.
The method according to claim 12, wherein the number of the first search spaces is N, the number of the second search spaces is M, and both N and M are positive values greater than or equal to 1 Integer, the jth first search space and the ith second search space satisfy the following correspondence: j = i mod N;

Wherein, the value of i is greater than or equal to 0 and less than or equal to M-1, and the value of j is greater than or equal to 0 and less than or equal to N-1.
The method of claim 15, wherein the method further comprises:

According to the first rule, sort the M second search spaces, and i represents the sequence number of the M second search spaces after sorting;

According to the second rule, the N first search spaces are sorted, and j represents the sequence number of the N first search spaces after sorting.
The method according to any one of claims 11 to 16, wherein the resource position of the first PDCCH includes a frequency domain resource position of the first PDCCH and a time domain resource position of the first PDCCH, so The first search space includes greater than or equal to 1 candidate PDCCH;

For the first search space
Candidate PDCCH, the determining the resource position of the first PDCCH according to the first search space includes: determining the first
Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, and L is an integer greater than or equal to 0;

The sm represents the second search space;

The p represents a set of control resources associated with the second search space;

The μ represents the parameter set corresponding to the BWP where the second search space is located;

Said
Represents the time domain resource position of the first PDCCH;

Said
When the time domain resource position of the first PDCCH is
Time, the starting position parameter of the first PDCCH frequency domain resource position, the
It is determined based on the second search space s m;

The s n represents the first search space;

The n CI represents the carrier indication field CIF of the first cell;

Said
It denotes the first search space of PDCCH candidates s n in number;

The N CCE, p represents the number of control channel units CCE included in the control resource set p;

Said
Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled, the search space of s n and the second search space corresponding to s m, the number of PDCCH candidates included Maximum value

The value of i is greater than or equal to 0, and less than or equal to L-1.
The method according to any one of claims 11 to 16, wherein the resource position of the first PDCCH includes a frequency domain resource position of the first PDCCH and a time domain resource position of the first PDCCH, so The first search space includes greater than or equal to 1 candidate PDCCH;

For the first search space
Candidate PDCCH, the determining the resource position of the first PDCCH according to the first search space includes: determining the first
Resource positions of PDCCH candidates:

Wherein, L represents the aggregation level of the first PDCCH, and L is an integer greater than or equal to 0;

The s n represents the first search space;

The p represents a set of control resources associated with the second search space;

The n CI represents the carrier indication field CIF of the first cell;

The μ represents the parameter set corresponding to the BWP where the first search space is located;

Said
Represents the time domain resource position of the first PDCCH;

Said
When the time-frequency resource position of the first PDCCH is
Time, the starting position parameter of the frequency domain resource position of the first PDCCH, the
Is determined according to the first search space s n ;

Said
It denotes the first search space of PDCCH candidates s n in number;

The N CCE, p represents the number of control channel units CCE included in the control resource set p;

Said
Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled, the search space of s n and the second search space corresponding to s m, the number of PDCCH candidates included Maximum value

The value of i is greater than or equal to 0, and less than or equal to L-1.
The method according to any one of claims 11 to 18, wherein the method further comprises:

Determining a second search space in which the second cell activates BWP;

Determining a resource position of a second PDCCH according to the second search space, the second PDCCH is used to send control information of the second cell, and the resource position of the second PDCCH is located in the resource of the second cell .
The method according to claim 19, wherein the resource location of the second PDCCH includes a frequency domain resource location of the second PDCCH and a time domain resource location of the second PDCCH, and the second search space Including a candidate PDCCH greater than or equal to;

For the candidate PDCCH
Candidate PDCCHs, and determining the resource position of the second PDCCH according to the second search space includes: determining the
Resource positions of PDCCH candidates:

Where L represents the aggregation level of the second PDCCH, and L is an integer greater than or equal to 0;

The sm represents the second search space;

The p represents a set of control resources associated with the second search space;

The μ represents the parameter set corresponding to the BWP where the second search space is located;

Said
Indicates the time domain resource position of the second PDCCH;

Said
When the time-frequency resource position of the second PDCCH is
Time, the starting position parameter of the second PDCCH frequency domain resource position, the
It is determined based on the second search space s m;

The n CI represents the carrier indication field CIF of the second cell;

Said
It denotes the number of PDCCH candidates in the second search space s m;

The N CCE, p represents the number of control channel units CCE included in the control resource set p;

Said
Represents all of the first cells when activated BWP aggregation level is L, the second cell is scheduled in the second search space corresponding to s m search space, the maximum number of PDCCH candidates included ;

The value of i is greater than or equal to 0, and less than or equal to L-1.
An apparatus characterized in that it is used to implement the method according to any one of claims 1 to 10.
An apparatus is characterized in that it includes a processor and a memory, and the memory stores instructions, and when the processor calls the instructions, the apparatus is caused to perform the method of any one of claims 1 to 10.
An apparatus is characterized by comprising:

A determining module, configured to determine a first search space of the active bandwidth part BWP of the first cell; and determine a resource position of a first physical downlink control channel PDCCH according to the first search space, the first PDCCH is used The control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell;

The receiving module is configured to detect the first PDCCH in the resource position of the first PDCCH.
An apparatus, characterized in that it includes a processor and a communication interface,

The processor is used to determine the first search space of the active bandwidth part BWP of the first cell; and according to the first search space, determine the resource position of the first physical downlink control channel PDCCH, the first PDCCH is used to transmit the The control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell;

The processor detects the first PDCCH in the resource position of the first PDCCH using the communication interface.
An apparatus characterized in that it is used to implement the method according to any one of claims 11 to 20.
An apparatus is characterized in that it includes a processor and a memory, and the memory stores instructions, and when the processor calls the instructions, the apparatus is caused to perform the method of any one of claims 11 to 20.
An apparatus is characterized by comprising:

A determining module, configured to determine a first search space of the active bandwidth part BWP of the first cell; and determine a resource position of a first physical downlink control channel PDCCH according to the first search space, the first PDCCH is used to transmit The control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell;

A sending module, configured to send the first PDCCH in the resource position of the first PDCCH.
An apparatus, characterized in that it includes a processor and a communication interface,

The processor is used to determine the first search space of the active bandwidth part BWP of the first cell; and according to the first search space, determine the resource position of the first physical downlink control channel PDCCH, the first PDCCH is used to transmit the The control information of the first cell, the resource position of the first PDCCH is located in the resource of the second cell;

The processor uses the communication interface to send the first PDCCH in the resource position of the first PDCCH.
A computer-readable storage medium, characterized by comprising instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 20.
A computer program product, characterized in that it includes instructions that, when run on a computer, cause the computer to perform the method of any one of claims 1 to 20.
A communication system, characterized by comprising the device according to any one of claims 21 to 24 and the device according to any one of claims 25 to 28.