CN110351041B

CN110351041B - Method and device for mapping physical downlink control channel

Info

Publication number: CN110351041B
Application number: CN201810299015.0A
Authority: CN
Inventors: 张晨晨; 郝鹏
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-04-04
Filing date: 2018-04-04
Publication date: 2022-01-28
Anticipated expiration: 2038-04-04
Also published as: CN110351041A; WO2019192542A1

Abstract

The present disclosure provides a method and a device for mapping a physical downlink control channel, wherein the method comprises: the second communication node reserves one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates; the physical downlink control channel candidates which are not reserved or deleted meet preset conditions, or the physical downlink control channel candidates which are not reserved or deleted meet other preset conditions; the second communication node maps the physical downlink control channel on the reserved or undeleted physical downlink control channel candidates. By adopting the technical scheme, the problem that a scheme how to map the physical downlink control channel in the physical downlink control channel candidates is lacked in the related technology is solved, and the mapping of the physical downlink control channel on the reserved physical downlink control channel candidates is realized.

Description

Method and device for mapping physical downlink control channel

Technical Field

The present disclosure relates to the field of communications, and in particular, to a method and an apparatus for mapping a physical downlink control channel.

Background

In Long Term Evolution (LTE) and New generation radio access technology (NR, New RAT), Downlink Control information is carried through a Physical Downlink Control Channel (PDCCH), and in general, a base station selects one PDCCH candidate among a plurality of PDCCH candidates as a final PDCCH Channel. The terminal does not know which PDCCH candidate (which may also be referred to as a candidate PDCCH) is finally selected by the base station among the plurality of PDCCH candidates as a final PDCCH channel. The terminal needs to try PDCCH demodulation and decoding one by one among the plurality of PDCCH candidates until a PDCCH channel can be successfully found.

The plurality of PDCCH candidates are typically distributed over a plurality of aggregation levels, each aggregation level typically containing a plurality of PDCCH candidates. The aggregation level refers to the number of Control Channel Elements (CCEs) included in one PDCCH candidate. For example, if the aggregation level is 4, each PDCCH candidate at that aggregation level consists of 4 CCEs.

It can be seen that the larger the number of PDCCH candidates, the larger the number of PDCCH candidates that the terminal needs to blindly detect, and therefore, the larger the number of CCEs that need channel estimation.

In the new generation of wireless communication technology, the terminal still needs to read the control signaling sent in the PDCCH based on blind detection. The concept of a set of search spaces is defined in NR, one set of search spaces may include one or more search spaces, one search space containing one or more PDCCH candidates. The base station can configure a blind detection opportunity and a control resource set CORESET corresponding to the search space set for each search space set, according to the configuration of the blind detection opportunity, the terminal can know which time domain positions need to blindly detect PDCCH candidates corresponding to all search spaces contained in the search space set, after the terminal performs blind detection operation on the PDCCH candidates, the terminal can know whether the base station sends PDCCH DCI bearing control signaling to the terminal, and if the base station sends the PDCCH DCI to the terminal, the control signaling in the PDCCH DCI can be read through demodulation.

For the problem that a scheme how to map a physical downlink control channel in a physical downlink control channel candidate is lacked in the related art, an effective solution does not exist at present.

Disclosure of Invention

The embodiment of the disclosure provides a method and a device for mapping a physical downlink control channel, so as to at least solve the problem that a scheme how to map the physical downlink control channel in physical downlink control channel candidates is lacked in the related art.

According to an embodiment of the present disclosure, a method for mapping a physical downlink control channel is provided, including: the second communication node reserves one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates; wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a first condition; the second type of resources of the physical downlink control channel candidates meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a third condition; the second type of resources of the physical downlink control channel candidates meet a third condition; the second communication node maps the physical downlink control channel on one or more physical downlink control channel candidates which are reserved or not deleted.

According to another embodiment of the present disclosure, there is also provided a method for detecting a physical downlink control channel, including: the first communication node reserves or deletes one or more physical downlink control channel candidates in physical downlink control channel candidates configured by the second communication node according to the condition, wherein the physical downlink control channel candidates which are not reserved or deleted meet at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a first condition; the second type of resources of the physical downlink control channel candidates meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a third condition; the second type of resources of the physical downlink control channel candidates meet a third condition; the first communication node performs blind detection operation on the reserved or undeleted physical downlink control channel candidate, and does not perform blind detection operation on the unreserved or undeleted physical downlink control channel candidate.

According to another embodiment of the present disclosure, there is also provided an apparatus for mapping a physical downlink control channel, including: a first determining module, configured to retain one or more physical downlink control channel candidates from the multiple physical downlink control channel candidates, or delete one or more physical downlink control channel candidates from the multiple physical downlink control channel candidates; wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a first condition; the second type of resources of the physical downlink control channel candidates meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a third condition; the second type of resources of the physical downlink control channel candidates meet a third condition; and the mapping module is used for mapping the physical downlink control channel on the reserved or undeleted physical downlink control channel candidate.

According to another embodiment of the present disclosure, there is also provided an apparatus for detecting a physical downlink control channel, including: a second determining module, configured to leave or delete one or more physical downlink control channel candidates in the physical downlink control channel candidates configured by the second communication node according to the condition, where the physical downlink control channel candidates that do not leave or delete satisfy at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a first condition; the second type of resources of the physical downlink control channel candidates meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a third condition; the second type of resources of the physical downlink control channel candidates meet a third condition; and the detection module is used for executing blind detection operation on the reserved or undeleted physical downlink control channel candidates and not executing the blind detection operation on the unreserved or undeleted physical downlink control channel candidates.

According to another embodiment of the present disclosure, there is also provided a base station including: a first processor, configured to retain one or more physical downlink control channel candidates from a plurality of physical downlink control channel candidates, or delete one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates; wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a first condition; the second type of resources of the physical downlink control channel candidates meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a third condition; the second type of resources of the physical downlink control channel candidates meet a third condition; the first processor is further configured to map the physical downlink control channel on the reserved or undeleted physical downlink control channel candidates.

According to another embodiment of the present disclosure, there is also provided a terminal including: a second processor, configured to leave or delete one or more physical downlink control channel candidates in the physical downlink control channel candidates configured by the second communication node according to the condition, where the physical downlink control channel candidates that do not leave or delete satisfy at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a first condition; the second type of resources of the physical downlink control channel candidates meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a third condition; the second type of resources of the physical downlink control channel candidates meet a third condition; the second processor is further configured to perform a blind detection operation on the reserved or undeleted physical downlink control channel candidate, and not perform the blind detection operation on the unreserved or undeleted physical downlink control channel candidate.

According to a further embodiment of the present disclosure, there is also provided a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.

According to yet another embodiment of the present disclosure, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any one of the above method embodiments.

By the present disclosure, the second communication node retains one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates; wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions: the first kind of resources of the physical downlink control channel candidate meet a first condition; the second type of resources of the physical downlink control channel candidate meet a first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first kind of resources of the physical downlink control channel candidate meet a third condition; the second type of resources of the physical downlink control channel candidate meet a third condition; the second communication node maps the physical downlink control channel on the reserved or undeleted physical downlink control channel candidates. By adopting the technical scheme, the problem that a scheme how to map the physical downlink control channel in the physical downlink control channel candidates is lacked in the related technology is solved, and the mapping of the physical downlink control channel on the reserved physical downlink control channel candidates is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a flowchart of a method for mapping a physical downlink control channel according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a specific implementation 1 according to a preferred embodiment of the present disclosure;

fig. 3 is a block diagram of a hardware structure of a terminal according to an embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The embodiment of the application provides a mobile communication network (including but not limited to a 5G mobile communication network), and the network architecture of the network can comprise a network side device (such as a base station) and a terminal. In this embodiment, an information transmission method capable of operating on the network architecture is provided, and it should be noted that an operating environment of the information transmission method provided in this embodiment is not limited to the network architecture.

The first communication node in this document may be a terminal, and the second communication node may be a base station side device, but is not limited thereto.

Example one

In this embodiment, a method for mapping a physical downlink control channel is provided, and fig. 1 is a flowchart of a method for mapping a physical downlink control channel according to an embodiment of the present disclosure, as shown in fig. 1, the flowchart includes the following steps:

step S102, the second communication node reserves one or more physical downlink control channel candidates from a plurality of physical downlink control channel candidates, or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates;

wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions: the first kind of resources of the physical downlink control channel candidate meet a first condition; the second type of resources of the physical downlink control channel candidate meet a first condition;

or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first kind of resources of the physical downlink control channel candidate meet a third condition; the second type of resources of the physical downlink control channel candidate meet a third condition;

step S104, the second communication node maps the physical downlink control channel on the reserved or undeleted physical downlink control channel candidate.

It should be added that the physical downlink control channel Candidate may be PDDCH Candidate. The first condition may be a condition predetermined by both the communication parties.

Through the steps, the second communication node reserves one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates; wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions: the first type of resources of the physical downlink control channel candidates meet a preset first condition; the second type of resources of the physical downlink control channel candidate meet a preset first condition; or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions: the first kind of resources of the physical downlink control channel candidate meet a third condition; the second type of resources of the physical downlink control channel candidate meet a third condition; the second communication node maps the physical downlink control channel on the reserved or undeleted physical downlink control channel candidates. By adopting the technical scheme, the problem that a scheme how to map the physical downlink control channel in the physical downlink control channel candidates is lacked in the related technology is solved, and the mapping of the physical downlink control channel on the reserved physical downlink control channel candidates is realized.

Alternatively, the main body of the above steps may be a base station, a terminal, etc., but is not limited thereto.

Optionally, the execution sequence of step S102 and step S104 may be interchanged, that is, step S104 may be executed first, and then step S102 may be executed.

Optionally, the first type of resource is a time-frequency resource unit in the PDCCH candidate, to which the PDCCH demodulation reference signal PDCCH DMRS is mapped; the second type of resource is a subset of the PDCCH candidate time frequency resource, and the intersection of the subset and the first type of resource is an empty set; wherein, the time frequency resource unit comprises at least one of the following: a physical resource block PRB, an orthogonal frequency division multiplexing OFDM symbol, a resource element RE, a resource element group REG, a control channel element CCE.

Optionally, the first condition comprises one of: the first type of resource and/or the second type of resource are/is overlapped with the third type of resource; the first type of resource and/or the second type of resource are/is overlapped with the third type of resource, and the overlapped resources meet a second condition.

It should be added that the first type of resource satisfying the first condition may be overlapping time-frequency resources where the first type of resource and the third type of resource have overlapping. The second type of resource satisfying the first condition may be that there is an overlapping time-frequency resource where the second type of resource and the third type of resource overlap, and the overlapping resource satisfies the second condition.

Optionally, the first type of resource and/or the second type of resource overlap with the third type of resource, and the overlapped resource satisfies a second condition, where the second condition includes at least one of:

the ratio of the number of the overlapped resources to the number of the first type of resources or the second type of resources is greater than or equal to a first threshold. The ratio of the number of time frequency resource units contained in the overlapped time frequency resource to the number of time frequency resource units contained in the first type of resource or the second type of resource contained in the PDCCH candidate is more than or equal to a preset first threshold, wherein the preset first threshold is a numerical value between [0, 1 ];

the ratio of the number of the overlapped resources to the sum of the number of the first type of resources and the number of the second type of resources is larger than or equal to a second threshold. The ratio of the number of time frequency resource units contained in the overlapped time frequency resource to the number of time frequency resource units contained in the first type of resource and the second type of resource contained in the PDCCH candidate is more than or equal to a preset second threshold, wherein the preset second threshold is a numerical value between [0, 1 ]; it should be added that one of the comparisons in this condition is the sum of the time-frequency resource unit data included in the first type of resource and the second type of resource.

The third type of resource or a subset of the third type of resource contains reference signal resources with port number greater than or equal to a third threshold, where the third threshold includes one of {1,2,4, 8, 16, 24, 32 };

the number of reference signal resources contained in the third type of resource or the subset of the third type of resource is greater than or equal to a fourth threshold, wherein the fourth threshold is a positive integer; it should be added that the third type of resource includes reference signal resources, and the number of the reference signal resources is greater than or equal to a certain number.

The third type of resource or the subset of the third type of resource includes a reference signal resource whose reference signal resource density is greater than or equal to a fifth threshold, where the preset fifth threshold is a positive number;

the third type of resource or the subset of the third type of resource comprises reference signal resources with a specific multiple access method, wherein the specific multiple access method comprises at least one of the following: code division multiplexing-free No CDM, frequency division-code division multiplexing FD-CDM2, code division multiplexing CDM4, code division multiplexing CDM 8;

the third type of resource or a subset of the third type of resource includes a reference signal resource with a code division multiplexing group size CDM group size greater than or equal to a sixth threshold, where the predetermined sixth threshold is a positive integer, and the predetermined sixth threshold may be one of {1,2,4.8 };

the third type of resource or the subset of the third type of resources includes a reference signal resource with a code division multiplexing group Index CDM group Index of a specific CDM group Index, which is supplemented by:

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

optionally, the third type of resource includes at least one of: rate matching resources; reserving resources; a Synchronization Signal (SS) resource; broadcast channel PBCH resources; the rest minimum system information RMSI resources; a long term evolution system cell reference signal LTE CRS resource; and a zero-power channel state information reference signal ZP CSI-RS resource.

Optionally, the third condition comprises at least one of: the third type of resource is a control resource set, and the first type of resource and/or the second type of resource are/is overlapped with the third type of resource; the first type of resource and the third type of resource are not overlapped; the first type of resource and/or the second type of resource overlap with the third type of resource, and the overlapped resource satisfies a fourth condition.

It is to be added that the control resource set may be COREST.

Optionally, the fourth condition comprises at least one of:

the first type of resources and/or the second type of resources are overlapped with the third type of resources, and the ratio of the number of time-frequency resource units contained in the overlapped resources to the number of time-frequency resource units contained in the first type of resources or the second type of resources contained in the PDCCH candidates is less than or equal to a preset seventh threshold, wherein the preset seventh threshold is a numerical value between [0 and 1 ];

the first type of resources and/or the second type of resources are overlapped with the third type of resources, and the ratio of the number of time-frequency resource units contained in the overlapped resources to the number of time-frequency resource units contained in the first type of resources and the second type of resources contained in the PDCCH candidates is less than or equal to a preset eighth threshold, wherein the preset eighth threshold is a numerical value between [0, 1 ]; it should be added that one of the comparisons in this condition is the sum of the number of time-frequency resource units included in the first type of resource and the second type of resource.

The third type of resource or a subset of the third type of resource includes reference signal resources with port number less than or equal to a ninth threshold, wherein the ninth threshold includes one of {1,2,4, 8, 16, 24, 32 };

the number of reference signal resources contained in the third type of resource or the subset of the third type of resource is less than or equal to a tenth threshold, wherein the tenth threshold is a positive integer; it should be added that the third type of resource may include reference signal resources, and the number of the reference signal resources is greater than or equal to a certain number.

The third type of resource or the subset of the third type of resource includes a reference signal resource whose reference signal resource density is less than or equal to an eleventh threshold, where the preset eleventh threshold is a positive number;

the third type of resource or the subset of the third type of resource comprises reference signal resources with multiple access being a specific multiple access, wherein the specific multiple access comprises but is not limited to at least one of the following: code division multiplexing-free No CDM, frequency division-code division multiplexing FD-CDM2, code division multiplexing CDM4, code division multiplexing CDM 8;

the third type of resource or a subset of the third type of resource includes reference signal resources with code division multiplexing group size CDM group size less than or equal to a twelfth threshold, where the predetermined twelfth threshold is a positive integer, and the predetermined twelfth threshold may be one of {1,2,4.8 };

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

it should be added that the first threshold, the second threshold or the nth threshold referred to in this document may be preconfigured by the communication system or semi-statically configured by the base station.

Optionally, the third type of resource may be a communication system pre-configuration or a base station semi-static indication, and the third type of resource includes at least one of the following: rate matching resources; reserving resources; a Synchronization Signal (SS) resource; physical broadcast channel PBCH resources; the rest minimum system information RMSI resources; a long term evolution system cell reference signal LTE CRS resource; and a zero-power channel state information reference signal ZP CSI-RS resource.

It is supplementary to be added that the SS resource of the synchronization signal; both physical broadcast channel PBCH resources, may also be denoted as synchronization signals/physical broadcast channel SS/PBCH resources.

Optionally, the rate matching resource or the reserved resource includes at least one of:

semi-static rate matching resources;

dynamic rate matching resources;

rate matching resources configured in a resource block RB and/or symbol mode;

rate matching resources configured in a resource unit RE and/or symbol mode;

semi-statically reserving resources;

dynamically reserving resources;

reserved resources configured in an RB and/or symbol mode;

reserved resources configured in an RE and/or symbol mode;

resource-set-bandwidth part Resource-set-bwp (band Width part);

rate-matching-physical downlink shared channel-aggregate rate-match-PDSCH-resource-set;

resource-set-cell;

resource-set-group 1 Resource-set-group-1;

resource-set-group 2 Resource-set-group-2;

the control resource set CORESET.

Optionally, after the second communication node retains one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, the method further includes: the second communication node performs rate matching on the designated time frequency resource; or, the second communication node performs rate matching on the specified time frequency resource, and the second communication node indicates the first communication node to perform rate matching on the specified time frequency resource.

Optionally, the specified time-frequency resource includes at least one of: all or part of the first type resources of the PDCCH candidate; all or a portion of the second type of resources of the PDCCH candidate; the first type of resource and the third type of resource are overlapped time frequency resources; the time frequency resource of the second type of resource and the third type of resource are overlapped; wherein the third type of resource includes at least one of: rate matching resources; synchronization signal/physical broadcast channel SS/PBCH resources; RMSI resources; LTE CRS resources; and zero-power ZP CSI-RS resources.

According to another embodiment of the present disclosure, there is also provided a method for detecting a physical downlink control channel, including the following steps:

step one, a first communication node reserves or deletes one or more physical downlink control channel candidates in physical downlink control channel candidates configured by a second communication node according to a condition, wherein the physical downlink control channel candidates which are not reserved or deleted meet at least one of the following conditions:

the first kind of resources of the physical downlink control channel candidate meet a first condition;

the second type of resources of the physical downlink control channel candidate meet a first condition;

or, the reserved or undeleted physical downlink control channel candidate satisfies at least one of the following conditions:

the first kind of resources of the physical downlink control channel candidate meet a third condition;

the second type of resources of the physical downlink control channel candidate meet a third condition;

and step two, the first communication node executes blind detection operation on the reserved or undeleted physical downlink control channel candidate and does not execute blind detection operation on the unreserved or undeleted physical downlink control channel candidate.

Through the steps, the first communication node does not reserve or delete part of PDCCH candidates, and performs blind detection operation on the rest PDCCH candidates, so that the problem that a large amount of resources are consumed in blind detection of PDDCH candidates by a terminal in the related technology is solved, blind detection does not need to be performed on all PDCCH candidates by the first communication node, the processing speed is increased, and a large amount of resources are saved.

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

Optionally, the fourth condition comprises at least one of:

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

semi-static rate matching resources;

dynamic rate matching resources;

rate matching resources configured in a resource block RB and/or symbol mode;

rate matching resources configured in a resource unit RE and/or symbol mode;

semi-statically reserving resources;

dynamically reserving resources;

reserved resources configured in an RB and/or symbol mode;

reserved resources configured in an RE and/or symbol mode;

resource-set-bandwidth part Resource-set-bwp (band Width part);

resource-set-cell;

resource-set-group 1 Resource-set-group-1;

resource-set-group 2 Resource-set-group-2;

the control resource set CORESET.

Optionally, according to system pre-configuration or information indication of the second communication node, the first communication node performs rate matching on the specified time-frequency resource when blind-detecting the PDCCH candidate.

Reference will now be made in detail to the preferred embodiments of the present disclosure.

NR systems also define some special Resource sets, such as rate matching resources (Resource Set), synchronization Signal/Physical Broadcast Channel (SS/PBCH) resources, Remaining Minimum System Information (RMSI) resources, and the special Resource sets are usually notified to the terminal by means of system subscription or semi-static configuration of the base station, so that the base station and the terminal can know time-frequency resources corresponding to the Resource sets.

At a certain time, for the transmitting side, the base station needs to select which PDCCH candidate to use from a plurality of PDCCH candidates to transmit PDCCH DCI to the terminal, that is, to map PDCCH DCI to a certain PDCCH candidate. For a PDCCH candidate having overlapping time-frequency resources with the above-mentioned resource set with a specific use, because PDCCH DCI may not be mapped on the overlapping time-frequency resources, the base station may map PDCCH DCI using the PDCCH candidate, or may not map PDCCH DCI using the PDCCH candidate.

For the receiving side, the terminal needs to perform blind detection on a plurality of PDCCH candidates contained in the search space, and determines whether the base station has transmitted PDCCH DCI to itself and which PDCCH candidate the base station uses to transmit PDCCH DCI to itself according to the blind detection result. In a search space of blind detection of a terminal, some PDCCH candidates and the resource set with the specific use may have overlapping time-frequency resources, and PDCCH DCI may not be mapped on the PDCCH candidates having the overlapping time-frequency resources.

Because the user does not know which PDCCH candidate the base station will send the PDCCH DCI on, the worst-case user may need to blindly detect all PDCCH candidates in the search space, and if the user can make a preliminary judgment on the PDCCH candidates that need the blind detection and does not blindly detect the PDCCH candidates that the base station will not map the PDCCH DCI, the blind detection times and complexity of the user can be reduced, power consumption is reduced, and processing delay is reduced.

In the NR system, several resource sets with specific purposes are defined, such as rate allocation resources, SS/PBCH resources, RMSI resources, reserved resources, and some pilot resources, and these resource sets with specific purposes may have time-frequency resource overlapping with part or all PDCCH candidates in the search space, and for PDCCH candidates with resource overlapping, the base station may not be used to transmit PDCCH DCI, and thus it is preferable that the terminal does not perform blind detection on these PDCCH candidates.

Therefore, a method for a base station to determine whether the PDCCH candidate can be used for mapping PDCCH DCI is provided, and correspondingly, a method for a terminal to determine whether to perform blind detection on the PDCCH candidate is also provided.

Specific example 1: (Candidate is not blindly detected when DMRS RE overlaps with third type resource in Candidate)

The base station configures a search space set A for the terminal, wherein the search space set A comprises search spaces { A1, …, An }, and each search space comprises a plurality of PDCCH candidates. According to the detection timing detection configured by the base station for the search space/search space set, when a certain detection timing arrives, the terminal needs to perform blind detection on a plurality of search spaces in the search space set a.

For a certain PDCCH candidate in a certain search space, the base station and the terminal may determine which CCEs the PDCCH candidate corresponds to according to a search space calculation formula, and further determine which time-frequency resource units the PDCCH candidate corresponds to, where the time-frequency resource units may include one or more of the following: PRB, RE, OFDM symbols.

According to the PDCCH demodulation reference signal configuration, which is preset by a system or configured by a base station, the base station sends PDCCH demodulation reference signals at predefined or configured time-frequency resource positions, and according to the predefined or configured time-frequency resource positions, a terminal can know which time-frequency resource units in all time-frequency resource units contained in PDCCH candidates send PDCCH demodulation pilot frequencies, and the time-frequency resource units are called as first-class PDCCH candidate resource units. For those time-frequency resource units that do not transmit the PDCCH demodulation reference signal, which are called second-type PDCCH candidate resource units, the PDCCH candidates may include a plurality of first-type PDCCH candidate resource units and a plurality of second-type PDCCH candidate resource units.

The base station configures one or more third types of resources for the terminal, wherein the third types of resources may include one or more of the following combinations: the Channel state Information resource comprises rate matching resources, SS/PBCH resources, RMSI resources, Long Term Evolution system Cell Reference Signal (LTE CRS) resources and Zero Power Channel state Information Reference Signal (ZP CSI-RS) resources. The rate matching resource may be one or more of the following combinations: semi-static rate matching resources, dynamic rate matching resources, RB-symbol level rate matching resources, and RE-symbol level rate matching resources.

For a certain PDCCH candidate in the search space, when at least one first-class PDCCH candidate resource unit overlaps with the time-frequency resource of the certain specific resource set, the base station discards the PDCCH candidate, does not send PDCCH DCI to the terminal on the PDCCH candidate, and the terminal does not need to blindly detect the PDCCH candidate. According to the method, the terminal can determine which PDCCH candidates in the search space { A1, …, An } need to perform blind detection, which PDCCH candidates do not need to perform blind detection, and the terminal only needs to perform blind detection operation on the PDCCH candidates determined to need to perform blind detection.

Fig. 2 is a schematic diagram of implementation 1 according to a preferred embodiment of the present disclosure, as shown in fig. 2, where Candidate1 and Candidate2 are both PDCCH candidates in the search space, where the first type PDCCH Candidate resource elements of Candidate1 overlap with a specific resource set, as shown by the red dashed box in fig. 1, and then the terminal does not blindly detect Candidate 1. Where the first type PDCCH Candidate resource element of Candidate2 does not overlap with the specific resource set (the second type PDCCH Candidate resource of Candidate2 overlaps with the specific resource set), the terminal blindly detects Candidate 2.

Specific example 2: (Candidate does not blindly detect DMRS REs or all REs overlapping with a specific resource set up to a certain threshold)

The base station configures a search space set A for the terminal, wherein the search space set A comprises search spaces { A1, …, An }, and each search space comprises a plurality of PDCCH candidates. According to the monitoring acquisition configured for the search space/search space set by the base station, when a certain monitoring acquisition arrives, the terminal needs to perform blind detection on a plurality of search spaces in the search space set a.

According to the PDCCH demodulation reference signal configuration, which is preset by a system or configured by a base station, the base station sends PDCCH demodulation reference signals at predefined or configured time-frequency resource positions, and according to the predefined or configured time-frequency resource positions, a terminal can know which time-frequency resource units in all time-frequency resource units contained in PDCCH candidates send PDCCH demodulation reference signals, and the time-frequency resource units are called as first-class PDCCH candidate resource units. For those time-frequency resource units that do not transmit the PDCCH demodulation reference signal, which are called second-type PDCCH candidate resource units, the PDCCH candidates may include a plurality of first-type PDCCH candidate resource units and a plurality of second-type PDCCH candidate resource units.

The base station configures one or more specific resource sets for the terminal, wherein the specific resource sets can comprise one or more of the following combinations: rate matching resources, SS/PBCH resources, RMSI resources, LTE CRS resources, ZP CSI-RS resources. The rate matching resource may be one or more of the following combinations: semi-static rate matching resources, dynamic rate matching resources, RB-symbol level rate matching resources, and RE-symbol level rate matching resources.

For a certain PDCCH candidate in a certain search space, when a time-frequency resource unit contained in the PDCCH candidate is overlapped with a specific resource set and the overlapped resource meets a first condition, the base station discards the PDCCH candidate and does not map PDCCH DCI on the PDCCH candidate, so that the terminal does not need to blindly detect the PDCCH candidate; if there are no overlapping resources or there are overlapping resources but the first condition is not met, the base station may map the PDCCH DCI on the PDCCH candidate, and the terminal may still blindly detect the PDCCH candidate.

The first condition comprises one or more of the following combinations:

1) the overlapping resources do not comprise the first type of PDCCH candidate resources and the overlapping resources comprise the second type of PDCCH candidate resources.

2) The overlapping resources comprise PDCCH candidate resources of a second type.

3) The ratio of the number of the first type PDCCH candidate resource units and/or the second type PDCCH candidate resource units contained in the overlapped resources to the number of all the first type PDCCH candidate resource units and/or the second type PDCCH candidate resource units contained in the PDCCH candidates is more than or equal to a threshold 1. The threshold 1 is a value between [0, 1], and the threshold 1 may be a system pre-configuration or a base station semi-static configuration.

4) The first type of PDCCH candidate resource unit and/or the second type of PDCCH candidate resource unit contained in the overlapped resource contain pilot frequency resources with the port number more than or equal to threshold 2, and the pilot frequency can be LTE CRS and/or ZP CSI-RS and/or CSI-RS, but is not limited to the above. The threshold 2 may be one of {1,2,4, 8, 16, 24, 32}, and the threshold 2 may be a system pre-configuration or a base station semi-static configuration.

5) The first type of PDCCH candidate resource unit and/or the second type of PDCCH candidate resource unit contained in the overlapped resource contain pilot frequency resources with the resource number more than or equal to a threshold 3, and the pilot frequency can be LTE CRS and/or ZP CSI-RS and/or CSI-RS, but is not limited to the above. The threshold 3 is a positive integer and may be a system pre-configuration or a base station semi-static configuration.

6) The first type of PDCCH candidate resource units and/or the second type of PDCCH candidate resource units contained in the overlapped resources contain pilot resources with the density of more than or equal to a threshold 4, and the pilot can be LTE CRS and/or ZP CSI-RS and/or CSI-RS, but the pilot resources are not limited to the LTE CRS and/or ZP CSI-RS. The threshold 4 is a positive number, for example, may be one of { 0.513 }, and may be system pre-configured or base station semi-static configured.

7) The first type of PDCCH candidate resource unit and/or the second type of PDCCH candidate resource unit contained in the overlapped resource contain pilot frequency resources of which the multiple access mode is a specific multiple access mode, and the pilot frequency can be LTE CRS and/or ZP CSI-RS and/or CSI-RS, but is not limited to the above. The specific multiple access modes include one or more of the following combinations: no CDM, FD-CDM2, CDM4, FD-CDM2, CDM8, etc., may be system pre-configured or base station semi-static configuration.

8) The overlapped resource comprises a first type PDCCH candidate resource unit and/or a second type PDCCH candidate resource unit, which comprises a pilot resource with CDM group size larger than or equal to threshold 5, wherein the pilot can be LTE CRS and/or ZP CSI-RS and/or CSI-RS, but is not limited to the above. The threshold 5 is a positive integer, for example, may be one of {1,2,4, 8}, and may be system pre-configured or base station semi-static configured.

9) The overlapped resource comprises a first type PDCCH candidate resource unit and/or a second type PDCCH candidate resource unit, which comprises a pilot resource with CDM group Index being a specific CDM group Index, and the pilot can be LTE CRS and/or ZP CSI-RS and/or CSI-RS, but is not limited to these. The particular CDM group Index comprises one or more of the following combinations: {0,0,0}, {0,1}, {0,1,2,3}, {0,1,2}, {0,1,2,3,4,5}, {0,1,2,3,4,5,6,7}, {0,1,2,3,4,5,6,7,8,9,10,11}, and {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}, etc.

Specific example 3: (Rate matching for PDCCH mapping)

According to the PDCCH demodulation reference configuration, which is preset by a system or configured by a base station, the base station sends PDCCH demodulation reference signals at predefined or configured time-frequency resource positions, and according to the predefined or configured time-frequency resource positions, a terminal can know which time-frequency resource units in all time-frequency resource units contained in PDCCH candidates send the PDCCH demodulation reference signals, and the time-frequency resource units are called as first-class PDCCH candidate resource units. For those time-frequency resource units that do not transmit the PDCCH demodulation reference signal, which are called second-type PDCCH candidate resource units, the PDCCH candidates may include a plurality of first-type PDCCH candidate resource units and a plurality of second-type PDCCH candidate resource units.

The base station selects one PDCCH candidate from a plurality of PDCCH candidates to map PDCCH DCI, if the PDCCH candidate and a specific resource set have overlapped resources, the base station performs rate matching on all or part of the first type PDCCH candidate resource units and/or the second type PDCCH candidate resource units in the overlapped resources when mapping the PDCCH DCI on the PDCCH candidates, namely mapping the PDCCH DCI on other resources in the PDCCH candidates except all or part of the first type PDCCH candidate resource units and/or the second type PDCCH candidate resource units in the overlapped resources.

If the terminal judges that blind detection needs to be performed on a certain PDCCH candidate in the search space, if the PDCCH candidate and a specific resource set have overlapped resources, the terminal considers that the base station performs rate matching on all or part of the first type PDCCH candidate resource units and/or the second type PDCCH candidate resource units in the overlapped resources when mapping PDCCH DCI on the PDCCH candidate, and the blind detection and/or decoding of the PDCCH candidate by the terminal are based on the rate matching hypothesis.

Specifically, the blind detection and/or decoding process based on the rate matching hypothesis is: and after knowing the REs occupied by the PDCCH candidates, deducting all or part of the first type PDCCH candidate resource units and/or the second type PDCCH candidate resource units in the overlapped resources, and mapping the PDCCH DCI by using other residual REs.

In the present application, technical features in the respective embodiments may be combined and used in one embodiment without conflict. Each example is merely the best mode of carrying out the present application.

By using the method provided by the disclosure, the terminal can determine which candidates in a certain search space need to perform blind detection and which candidates do not need to perform blind detection in the search space, thereby reducing the blind detection times, reducing time delay and power consumption, and being beneficial to the terminal to quickly demodulate DCI. And for the Candidate needing to perform blind detection, the terminal can judge whether to perform rate matching operation on part of the time-frequency resources.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present disclosure.

Example two

In this embodiment, a device for mapping a physical downlink control channel is further provided, where the device is used to implement the foregoing embodiments and preferred embodiments, and details are not repeated for what has been described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

According to an embodiment of the present disclosure, an apparatus for mapping a physical downlink control channel is provided, including:

a first determining module, configured to retain one or more physical downlink control channel candidates from the multiple physical downlink control channel candidates, or delete one or more physical downlink control channel candidates from the multiple physical downlink control channel candidates;

wherein, the physical downlink control channel candidate which is not reserved or deleted satisfies at least one of the following conditions:

and the mapping module is used for mapping the physical downlink control channel on the reserved or undeleted physical downlink control channel candidate.

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

It is to be added that the control resource set may be COREST.

Optionally, the fourth condition comprises at least one of:

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

semi-static rate matching resources;

dynamic rate matching resources;

rate matching resources configured in a resource block RB and/or symbol mode;

rate matching resources configured in a resource unit RE and/or symbol mode;

semi-statically reserving resources;

dynamically reserving resources;

reserved resources configured in an RB and/or symbol mode;

reserved resources configured in an RE and/or symbol mode;

resource-set-bandwidth part Resource-set-bwp (band Width part);

resource-set-cell;

resource-set-group 1 Resource-set-group-1;

resource-set-group 2 Resource-set-group-2;

the control resource set CORESET.

Optionally, the first determining module is further configured to perform rate matching on the specified time-frequency resource after one or more physical downlink control channel candidates are retained from the multiple physical downlink control channel candidates or one or more physical downlink control channel candidates in the multiple physical downlink control channel candidates are deleted; or, the first communication node is further configured to perform rate matching on the specified time-frequency resource, and instruct the first communication node to perform rate matching on the specified time-frequency resource.

According to another embodiment of the present disclosure, there is also provided an apparatus for detecting a physical downlink control channel, including:

a second determining module, configured to leave or delete one or more PDCCH candidates in the PDCCH candidates configured by the second communications node according to a condition, where the condition includes at least one of:

the first type of resource of the PDCCH candidate satisfies a first condition;

the second type of resource of the PDCCH candidate satisfies a first condition;

and the detection module is used for executing blind detection operation on the reserved or undeleted PDCCH candidates and not executing the blind detection operation on the unreserved or deleted PDCCH candidates.

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

Optionally, the fourth condition comprises at least one of:

{0,0,0}，

{0}，

{0,1}，

{0,1,2,3}，

{0,1,2}，

{0,1,2,3,4,5}，

{0,1,2,3,4,5,6,7}，

{0,1,2,3,4,5,6,7,8,9,10,11}，

{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}。

semi-static rate matching resources;

dynamic rate matching resources;

rate matching resources configured in a resource block RB and/or symbol mode;

rate matching resources configured in a resource unit RE and/or symbol mode;

semi-statically reserving resources;

dynamically reserving resources;

reserved resources configured in an RB and/or symbol mode;

reserved resources configured in an RE and/or symbol mode;

resource-set-bandwidth part Resource-set-bwp (band Width part);

resource-set-cell;

resource-set-group 1 Resource-set-group-1;

resource-set-group 2 Resource-set-group-2;

the control resource set CORESET.

Optionally, according to system pre-configuration or a second communication node passing information indication, the detection module performs rate matching on the specified time-frequency resource when blind-detecting the PDCCH candidate.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

EXAMPLE III

According to another embodiment of the present disclosure, there is also provided a base station including:

a first processor, configured to retain one or more physical downlink control channel candidates from a plurality of physical downlink control channel candidates, or delete one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates;

the first type of resources of the physical downlink control channel candidates meet a first condition;

the second type of resources of the physical downlink control channel candidates meet a first condition;

the first type of resources of the physical downlink control channel candidates meet a third condition;

the second type of resources of the physical downlink control channel candidates meet a third condition;

the first processor is further configured to map the physical downlink control channel on the reserved or undeleted physical downlink control channel candidates.

Optionally, the base station further includes a first communication device, configured to send the mapped physical downlink control channel to the terminal.

According to another embodiment of the present disclosure, there is also provided a terminal including:

a second processor, configured to leave or delete one or more PDCCH candidates in the PDCCH candidates configured by the second communications node according to a condition, where the condition includes at least one of:

a first type of resource of the PDCCH candidate satisfies a first condition;

a second type of resource of the PDCCH candidate satisfies a first condition;

the second processor is further configured to perform a blind detection operation on the reserved or undeleted PDCCH candidates, and not perform a blind detection operation on the unreserved or deleted PDCCH candidates.

Optionally, the terminal further includes a second communication device, configured to receive a PDCCH candidate configured by the second communication node.

Fig. 3 is a block diagram of a hardware structure of a terminal according to an embodiment of the present disclosure, and as shown in fig. 3, the mobile terminal 30 may include one or more processors 302 (only one is shown in fig. 3) (the processor 302 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 304 for storing data, and optionally, the mobile terminal may further include a transmission device 306 for communication function and an input/output device 308. It will be understood by those skilled in the art that the structure shown in fig. 3 is only an illustration, and does not limit the structure of the mobile terminal. For example, the mobile terminal 30 may also include more or fewer components than shown in FIG. 3, or have a different configuration than shown in FIG. 3.

The memory 304 may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the method for detecting a physical downlink control channel in the embodiment of the present disclosure, and the processor 302 executes various functional applications and data processing by running the software programs and modules stored in the memory 304, so as to implement the method described above. The memory 304 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 304 may further include memory located remotely from the processor 302, which may be connected to the mobile terminal 30 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device 306 is used for receiving or sending data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal 30. In one example, the transmission device 306 includes a Network Interface Controller (NIC) that can be connected to other Network devices through a base station to communicate with the internet. In one example, the transmission device 306 can be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.

Example four

According to another embodiment of the present disclosure, there is also provided a storage medium, characterized in that the storage medium has a computer program stored therein, wherein the computer program is configured to execute the method described in any of the above embodiments when running.

According to another embodiment of the present disclosure, there is also provided an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the method of any one of the above embodiments.

It will be apparent to those skilled in the art that the modules or steps of the present disclosure described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. As such, the present disclosure is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A method for mapping a Physical Downlink Control Channel (PDCCH), comprising:

the second communication node reserves one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates;

the second communication node performs rate matching on the specified time frequency resource;

the second communication node maps the physical downlink control channel on one or more physical downlink control channel candidates which are reserved or not deleted.

2. The method of claim 1, comprising:

the first type of resource is a resource for mapping a physical downlink control channel demodulation reference signal PDCCH DMRS in the physical downlink control channel candidates;

the second type of resource is a resource other than PDCCH DMRS in the physical downlink control channel candidate.

3. The method of claim 2, wherein the first condition comprises one of:

the first type of resource and/or the second type of resource are/is overlapped with the third type of resource;

the first type of resource and/or the second type of resource are/is overlapped with the third type of resource, and the overlapped resources meet a second condition.

4. The method of claim 3, wherein the second condition comprises at least one of:

the ratio of the number of the overlapped resources to the number of the first type of resources or the second type of resources is greater than or equal to a first threshold;

the ratio of the number of the overlapped resources to the sum of the number of the first type of resources and the number of the second type of resources is greater than or equal to a second threshold;

the third type of resource or the subset of the third type of resource comprises reference signal resources with port number greater than or equal to a third threshold;

the number of reference signal resources contained in the third type of resource or the subset of the third type of resource is greater than or equal to a fourth threshold;

the third type of resource or the subset of the third type of resource includes a reference signal resource whose reference signal resource density is greater than or equal to a fifth threshold;

the third type of resource or the subset of the third type of resource comprises reference signal resources with multiple access as a specific multiple access, wherein the specific multiple access comprises at least one of the following: code division multiplexing-free No CDM, frequency division-code division multiplexing FD-CDM2, code division multiplexing CDM4, code division multiplexing CDM 8;

the third type of resource or the subset of the third type of resource includes a reference signal resource with a code division multiplexing group size CDM group size greater than or equal to a sixth threshold;

the third type of resource or the subset of the third type of resource includes a reference signal resource with a code division multiplexing group Index CDM group Index being a specific CDM group Index.

5. The method of claim 3, wherein the third type of resource comprises at least one of:

rate matching resources; reserving resources; a Synchronization Signal (SS) resource; broadcast channel PBCH resources; the rest minimum system information RMSI resources; a long term evolution system cell reference signal LTE CRS resource; and a zero-power channel state information reference signal ZP CSI-RS resource.

6. The method of claim 1, wherein the third condition comprises at least one of:

the third type of resource is a control resource set, and the first type of resource and/or the second type of resource are/is overlapped with the third type of resource;

the first type of resource is not overlapped with the third type of resource;

the first type of resource and/or the second type of resource are/is overlapped with the third type of resource, and the overlapped resources meet a fourth condition.

7. The method of claim 6, wherein the third type of resource comprises at least one of:

8. The method of claim 6, wherein the fourth condition comprises at least one of:

the ratio of the number of the overlapped resources to the number of the first type of resources or the second type of resources is less than or equal to a seventh threshold;

the ratio of the number of the overlapped resources to the sum of the number of the first type of resources and the number of the second type of resources is less than or equal to an eighth threshold;

the third type of resource or the subset of the third type of resource includes a reference signal resource whose port number is less than or equal to a ninth threshold;

the third type of resource or the subset of the third type of resource contains the number of reference signal resources less than or equal to a tenth threshold;

the third type of resource or the subset of the third type of resource comprises a reference signal resource with a reference signal resource density less than or equal to an eleventh threshold;

the third type of resource or the subset of the third type of resource includes reference signal resources with multiple access as a specific multiple access, where the specific multiple access includes but is not limited to at least one of the following: code division multiplexing-free No CDM, frequency division-code division multiplexing FD-CDM2, code division multiplexing CDM4, code division multiplexing CDM 8;

the third type of resource or the subset of the third type of resource comprises a reference signal resource with a code division multiplexing group size (CDM group size) less than or equal to a twelfth threshold;

9. The method of claim 5 or 7, wherein the rate-matched resources or reserved resources comprise at least one of:

semi-static rate matching resources;

dynamic rate matching resources;

rate matching resources configured in a resource block RB and/or symbol mode;

rate matching resources configured in a resource unit RE and/or symbol mode;

semi-statically reserving resources;

dynamically reserving resources;

reserved resources configured in an RB and/or symbol mode;

reserved resources configured in the RE and/or symbol manner.

10. The method of claim 1, wherein after the second communication node retains one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates or deletes one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates, the method further comprises:

and the second communication node performs rate matching on the specified time frequency resource, and the second communication node indicates the first communication node to perform rate matching on the specified time frequency resource.

11. The method of claim 10, wherein the specified time-frequency resources comprise at least one of:

all or part of the first type resources of the physical downlink control channel candidates;

all or part of the second type resources of the physical downlink control channel candidates;

all or part of the time frequency resources overlapped by the first type resources and the third type resources;

all or part of the time frequency resources overlapped by the second type of resources and the third type of resources;

wherein the third type of resource comprises at least one of the following: rate matching resources; reserving resources; a Synchronization Signal (SS) resource; broadcast channel PBCH resources; the rest minimum system information RMSI resources; a long term evolution system cell reference signal LTE CRS resource; and a zero-power channel state information reference signal ZP CSI-RS resource.

12. A method for detecting a Physical Downlink Control Channel (PDCCH), comprising:

the first communication node reserves or deletes one or more physical downlink control channel candidates in physical downlink control channel candidates configured by the second communication node according to the condition, wherein the physical downlink control channel candidates which are not reserved or deleted meet at least one of the following conditions:

the first communication node executes blind detection operation on the reserved or undeleted physical downlink control channel candidate and does not execute blind detection operation on the unreserved or undeleted physical downlink control channel candidate;

and according to system pre-configuration, when the first communication node blindly detects the physical downlink control channel candidate, performing rate matching on the appointed time-frequency resource.

13. The method of claim 12,

and the second communication node performs rate matching on the specified time-frequency resource through the information indication when the first communication node blindly detects the physical downlink control channel candidate.

14. The method of claim 13, wherein the specified time-frequency resources comprise at least one of:

15. An apparatus for mapping a physical downlink control channel, comprising:

a first determining module, configured to retain one or more physical downlink control channel candidates from the multiple physical downlink control channel candidates, or delete one or more physical downlink control channel candidates from the multiple physical downlink control channel candidates; the system is also used for carrying out rate matching on the appointed time-frequency resources;

16. An apparatus for detecting a physical downlink control channel, comprising:

a second determining module, configured to leave or delete one or more physical downlink control channel candidates in the physical downlink control channel candidates configured by the second communication node according to the condition, where the physical downlink control channel candidates that do not leave or delete satisfy at least one of the following conditions:

the detection module is used for executing blind detection operation on the reserved or undeleted physical downlink control channel candidates and not executing the blind detection operation on the unreserved or undeleted physical downlink control channel candidates; and the first communication node is also used for carrying out rate matching on the specified time-frequency resource when the first communication node blindly detects the physical downlink control channel candidate according to the system pre-configuration.

17. A base station, comprising:

a first processor, configured to retain one or more physical downlink control channel candidates from a plurality of physical downlink control channel candidates, or delete one or more physical downlink control channel candidates from the plurality of physical downlink control channel candidates; the system is also used for carrying out rate matching on the appointed time-frequency resources;

18. A terminal, comprising:

a second processor, configured to leave or delete one or more physical downlink control channel candidates in the physical downlink control channel candidates configured by the second communication node according to the condition, where the physical downlink control channel candidates that do not leave or delete satisfy at least one of the following conditions:

the second processor is further configured to perform a blind detection operation on the reserved or undeleted physical downlink control channel candidate, and not perform a blind detection operation on the unreserved or undeleted physical downlink control channel candidate; and the first communication node is also used for carrying out rate matching on the specified time-frequency resource when the first communication node blindly detects the physical downlink control channel candidate according to the system pre-configuration.

19. A storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 14 when executed.

20. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 14.