CN110351002B

CN110351002B - Priority determination and monitoring method and device for candidate PDCCH (physical Downlink control channel), storage medium, base station and terminal

Info

Publication number: CN110351002B
Application number: CN201810290995.8A
Authority: CN
Inventors: 刘萌萌; 周化雨; 周欢
Original assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2018-04-03
Filing date: 2018-04-03
Publication date: 2022-02-11
Anticipated expiration: 2038-04-03
Also published as: CN110351002A

Abstract

A method, a device, a storage medium, a base station and a terminal for determining and monitoring the priority of a candidate PDCCH are provided, and the method for determining the priority of the candidate PDCCH comprises the following steps: for the search space sets of the same type, determining a first priority of each search space set according to the quantity of non-overlapping CCEs in each search space set; and for the search space sets with the same first priority, determining the second priority of each search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set. The technical scheme of the invention can configure the priority of the PDCCH in the same type of search space set, so that the UE monitors the PDCCH according to the configured priority, and the success rate of blind detection is improved.

Description

Priority determination and monitoring method and device for candidate PDCCH (physical Downlink control channel), storage medium, base station and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a storage medium, a base station, and a terminal for determining and monitoring a priority of a candidate PDCCH.

Background

In a New Radio (NR) system of the fifth Generation mobile communication technology (5th-Generation, 5G), the maximum number of Physical Downlink Control Channel (PDCCH) candidates is a function of subcarrier spacing. When the subcarrier spacing is 15, 30, 60, 120kHz, respectively, the maximum number of PDCCH candidates (PDCCH candidates) is accordingly

44, 36, 22, 20, respectively. Wherein,

the maximum number of blind tests in a timeslot includes all Aggregation Levels (AL) and a Downlink Control Information (DCI) format (DCI format for short). A terminal (User Equipment, UE) must have a certain blind detection capability. The more times of blind detection, the more complexity of UE blind detectionThe higher. In addition, the number of Control Channel Elements (CCEs) is also an important factor that affects the Channel estimation complexity required for the UE blind detection. For example, one blind detection with an aggregation level AL of 1 requires at least 1 CCE for channel estimation, and one blind detection with an aggregation level AL of 16 requires at least 16 CCEs for channel estimation. The maximum number of CCEs that a UE must be able to support, also a function of subcarrier spacing, is already given in the 5G NR standard. When the subcarrier spacing is 15, 30, 60, 120kHz, respectively, the maximum number of non-overlapping CCEs, accordingly

56, 48, 32 respectively. The more the number of the non-overlapping CCEs is, the higher the channel estimation complexity of the UE in blind detection is.

In the prior art, in order to provide more configuration flexibility for a base station, the 5G NR allows the base station to configure the number of candidate PDCCHs and the number of CCEs exceeding the capability of the UE, and accordingly allows the UE to selectively monitor a part of candidate PDCCHs within the capability range. It has been determined in the standard that Common Search Space (CSS) takes precedence over UE-specific Search Space (USS) in deciding priority according to Search Space type (Search Space type).

However, the priority order of the PDCCH candidates within the same search space type and within the same search space set (search space set) has not been determined.

Disclosure of Invention

The invention solves the technical problem of how to determine the priority of the candidate PDCCH in the same type of search space set, so that the UE monitors the candidate PDCCH according to the determined priority, the probability of missed detection is reduced, and the success rate of blind detection is improved.

In order to solve the above technical problem, an embodiment of the present invention provides a method for determining a priority of a PDCCH candidate, where the method for determining a priority of a PDCCH candidate includes: for the search space sets of the same type, determining a first priority of each search space set according to the quantity of non-overlapping CCEs in each search space set; and for the search space sets with the same first priority, determining the second priority of each search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set.

Optionally, the method for determining the priority of the PDCCH candidate further includes: for the search space set with the same second priority, dividing a plurality of candidate PDCCHs with different aggregation levels in the search space set into a plurality of candidate groups, wherein CCEs occupied by the candidate PDCCHs in each candidate group are overlapped; determining a third priority of the plurality of candidate groups in order of the number of overlapping CCEs.

Optionally, the method for determining the priority of the PDCCH candidate further includes: and determining the fourth priority of each candidate PDCCH in the candidate group according to the high-low order of the aggregation level in the same candidate group.

Optionally, the method for determining the priority of the PDCCH candidate further includes: and in the same candidate group, determining a fifth priority according to the size of the index of each candidate PDCCH in the candidate group.

Optionally, the determining the first priority of each search space set according to the number of non-overlapping CCEs in the search space set includes: determining that the first priority of the non-overlapping CCE larger-number search space set is higher than the first priority of the non-overlapping CCE smaller-number search space set; or, determining that the first priority of the search space set with the smaller number of non-overlapping CCEs is higher than the first priority of the search space set with the larger number of non-overlapping CCEs.

Optionally, the determining the second priority of each search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set includes: determining a second priority of each search space set according to the size sequence of the identifier of each search space set; and/or determining a second priority of the search space set comprising the downlink control information with the format of 0_0, 1_0, 2_1, 2_2 or 2_3 to be higher than a second priority of the search space set comprising the downlink control information with the format of other formats.

In order to solve the above technical problem, an embodiment of the present invention further discloses a method for monitoring a candidate PDCCH, where the method for monitoring a candidate PDCCH includes: for the search space sets of the same type, monitoring the search space sets respectively according to the first priority of each search space set, wherein the first priority is determined according to the quantity of non-overlapping CCEs in each search space set; and for the search space sets with the same first priority, monitoring the search space sets according to the second priority of each search space set, wherein the second priority is determined according to the size of the identifier of each search space set and/or the format of downlink control information in each search space set.

Optionally, the method for monitoring a candidate PDCCH further includes: and for the search space sets with the same second priority, monitoring the candidate groups respectively according to the third priority of each candidate group, wherein the candidate groups are obtained by dividing a plurality of candidate PDCCHs with different aggregation levels in the search space sets, and CCEs (control channels element) occupied by the candidate PDCCHs in each candidate group are overlapped.

Optionally, the method for monitoring a candidate PDCCH further includes: and respectively monitoring the candidate PDCCHs according to the fourth priority of each candidate PDCCH in the same candidate group, wherein the fourth priority is determined according to the high-low order of the aggregation level.

Optionally, the method for monitoring a candidate PDCCH further includes: and in the same candidate group, monitoring the candidate PDCCHs according to the fifth priority of each candidate PDCCH, wherein the fifth priority is determined according to the size of the index of each candidate PDCCH in the candidate group.

Optionally, the method for monitoring a candidate PDCCH further includes: in the monitoring process, when the monitoring times reach the preset times or the number of CCEs used for channel estimation exceeds a preset threshold value, the monitoring is finished.

In order to solve the above technical problem, an embodiment of the present invention further discloses a priority determination apparatus for candidate PDCCHs, including: the first priority determining module is suitable for determining the first priority of the search space set according to the quantity of non-overlapping CCEs (control channel elements) in each search space set for the same type of search space sets; and the second priority determining module is suitable for determining the second priority of the search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set for the search space sets with the same first priority.

Optionally, the apparatus for determining priority of PDCCH candidates further includes: a candidate group division module, adapted to divide, for the search space set having the same second priority, a plurality of candidate PDCCHs having different aggregation levels in the search space set into a plurality of candidate groups, where CCEs occupied by the candidate PDCCHs in each candidate group overlap; a third priority determining module adapted to determine a third priority of the plurality of candidate groups in order of a high or low order of the number of overlapping CCEs.

Optionally, the apparatus for determining priority of PDCCH candidates further includes: and the fourth priority determining module is suitable for determining the fourth priority of each candidate PDCCH in the candidate group according to the high-low order of the aggregation level in the same candidate group.

Optionally, the apparatus for determining priority of PDCCH candidates further includes: and the fifth priority determining module is suitable for determining a fifth priority according to the size of the index of each candidate PDCCH in the candidate group in the same candidate group.

Optionally, the first priority determining module includes: a first determining unit adapted to determine that a first priority of the non-overlapping CCE large-number search space set is higher than a first priority of the non-overlapping CCE small-number search space set; a second determining unit adapted to determine that the first priority of the non-overlapping CCE-less search space set is higher than the first priority of the non-overlapping CCE-greater search space set.

Optionally, the second priority determining module includes: a third determining unit, adapted to determine a second priority of each search space set according to the size order of the identifier of each search space set; a fourth determining unit adapted to determine a second priority of the search space set comprising the downlink control information of format 0_0, 1_0, 2_1, 2_2, or 2_3 higher than a second priority of the search space set comprising the downlink control information of format other than format.

The embodiment of the invention also discloses a monitoring device of the candidate PDCCH, which comprises the following components: the first monitoring module is suitable for monitoring the search space sets of the same type according to the first priority of each search space set, wherein the first priority is determined according to the quantity of non-overlapping CCEs in each search space set; and the second monitoring module is suitable for monitoring the search space sets with the same first priority according to the second priorities of the search space sets, wherein the second priorities are determined according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set.

Optionally, the apparatus for monitoring the candidate PDCCH further includes: and the candidate group monitoring module is suitable for monitoring the candidate groups according to the third priority of each candidate group for the search space sets with the same second priority, the candidate groups are obtained by dividing a plurality of candidate PDCCHs with different aggregation levels in the search space sets, and CCEs occupied by the candidate PDCCHs in each candidate group are overlapped.

Optionally, the apparatus for monitoring the candidate PDCCH further includes: and the first candidate PDCCH monitoring module is suitable for monitoring the candidate PDCCHs respectively according to the fourth priority of each candidate PDCCH in the same candidate group, and the fourth priority is determined according to the high-low order of the aggregation level.

Optionally, the apparatus for monitoring the candidate PDCCH further includes: and the second candidate PDCCH monitoring module is suitable for respectively monitoring the candidate PDCCHs according to the fifth priority of each candidate PDCCH in the same candidate group, and the fifth priority is determined according to the size of the index of each candidate PDCCH in the candidate group.

Optionally, the apparatus for monitoring the candidate PDCCH further includes: and the judging module is suitable for ending the monitoring when the monitoring times reach the preset times or the number of CCEs used for channel estimation exceeds a preset threshold value in the monitoring process.

The embodiment of the invention also discloses a storage medium, wherein a computer instruction is stored on the storage medium, and when the computer instruction runs, the step of the priority determination method of the candidate PDCCH or the step of the monitoring method of the candidate PDCCH is executed.

The embodiment of the invention also discloses a base station, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the priority determination method of the candidate PDCCH when running the computer instructions.

The embodiment of the invention also discloses a terminal which comprises a memory and a processor, wherein the memory is stored with a computer instruction which can be operated on the processor, and the processor executes the step of the monitoring method of the candidate PDCCH when operating the computer instruction.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

according to the technical scheme, for the same type of search space sets, the first priority of each search space set is determined according to the quantity of non-overlapping CCEs in each search space set; and for the search space sets with the same first priority, determining the second priority of each search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set. In the technical scheme of the invention, the quantity of non-overlapping CCEs in a search space set is positively correlated with the quantity of CCEs required to be subjected to channel estimation by UE, and a base station determines the first priority of the search space set according to the quantity of the non-overlapping CCEs; the size of the identifier of the search space set can represent the sequence of the search space set, and the format of the downlink control information in the search space set represents the importance degree of the information carried by the search space set, so that the base station determines the second priority according to the information, and the UE can have more monitoring opportunities when monitoring the candidate PDCCH according to the first priority and the second priority, thereby reducing the probability of missed detection and improving the success rate of blind detection.

Further, for the search space set with the same second priority, dividing a plurality of candidate PDCCHs with different aggregation levels in the search space set into a plurality of candidate groups, where CCEs occupied by the candidate PDCCHs in each candidate group are overlapped; determining a third priority of the plurality of candidate groups in order of the number of overlapping CCEs. In the technical scheme of the invention, the more the number of overlapped CCEs occupied by the candidate PDCCHs in the candidate group is, the more the number of channel estimation times can be saved when UE blind detection is represented; therefore, the base station determines the third priority according to the number of the overlapped CCEs, so that when the UE monitors the candidate PDCCH according to the third priority, the efficiency of channel estimation is high, and the success rate of blind detection is further improved.

Further, a second priority of the search space set including the downlink control information with the format 0_0, 1_0, 2_1, 2_2, or 2_3 is determined to be higher than a second priority of the search space set including the downlink control information with the format other than the format. In the technical scheme of the invention, compared with downlink control information in other formats (0_1 and 1_1), the importance of information carried by the downlink control information in the format 0_0, 1_0, 2_1, 2_2 or 2_3 is higher, and the second priority of the search space set in which the downlink control information is located can be set to be higher; the UE can preferentially monitor the downlink control information, so that the UE service is prevented from being influenced, the UE service is optimized, and the communication efficiency and the user experience are improved.

Drawings

FIG. 1 is a flowchart of a method for determining a priority of a PDCCH candidate according to an embodiment of the present invention;

FIG. 2 is a detailed diagram of a search space set according to an embodiment of the present invention;

FIG. 3 is a detailed diagram of another search space collection according to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating a method for monitoring a candidate PDCCH in accordance with an embodiment of the present invention;

FIG. 5 is a block diagram illustrating an apparatus for determining a priority of a PDCCH candidate according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an apparatus for monitoring candidate PDCCHs according to an embodiment of the present invention.

Detailed Description

As described in the background art, the priority order of PDCCH candidates within the same search space type and within the same search space set has not been determined in the prior art.

The inventor of the present application finds that, in the existing scheme, the priority of the candidate PDCCH to be monitored in the search space set may be determined based on a Radio Network Temporary Identity (RNTI). However, there are many RNTIs involved in different search space sets, and actually the number of blind tests is not affected by the RNTIs. When the number of blind tests and the number of CCEs used for channel estimation exceed the capability of the UE, determining the priority of a search space set based on the RNTI cannot improve the blind test efficiency of the UE.

In the technical scheme of the invention, the quantity of non-overlapping CCEs in a search space set is positively correlated with the quantity of CCEs required to be subjected to channel estimation by UE, and a base station determines the first priority of the search space set according to the quantity of the non-overlapping CCEs; the size of the identifier of the search space set can represent the sequence of the search space set, and the format of the downlink control information in the search space set represents the importance degree of the information carried by the search space set, so that the base station determines the second priority according to the information, and the UE can have more monitoring opportunities when monitoring the candidate PDCCH according to the first priority and the second priority, thereby reducing the probability of missed detection and improving the success rate of blind detection.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a flowchart of a method for determining priority of PDCCH candidates according to an embodiment of the present invention.

The method for determining the priority of the candidate PDCCH shown in fig. 1 may be used on the base station side, and the method for determining the priority of the candidate PDCCH may include the following steps:

step S101: for the search space sets of the same type, determining a first priority of each search space set according to the quantity of non-overlapping CCEs in each search space set;

step S102: and for the search space sets with the same first priority, determining the second priority of each search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set.

In this embodiment, a set of candidate PDCCHs to be monitored by the UE is referred to as a search space (search space). The search spaces have Aggregation Levels (AL), and the search spaces of different Aggregation levels constitute a search space set. The UE may have one or more Control Resource sets (CORESET), and each CORESET may have one or more search space sets therein. The candidate PDCCHs are transmitted in the set of search spaces. Within one search space set, there will be multiple PDCCH candidates. Usually, only 1 of the candidate PDCCHs is actually transmitted to the UE by the base station. One candidate PDCCH may occupy 1, 2, 4, 8 or 16 CCEs within the CORESET, and accordingly, may occupy time-frequency resources within the CORESET.

The type (Search Space type) of the Search Space set includes Common Search Space (CSS) and UE-specific Search Space (USS). The set of search spaces of the type common search space has a higher priority than the set of search spaces of the type UE-specific search space.

If the search space sets are of the same type, e.g., all common search spaces or all UE-specific search spaces, the base station may determine the first priority of each search space set according to the number of non-overlapping CCEs in the search space set.

The non-overlapping CCEs in the search space set mean that the CCEs occupied by all the candidate PDCCHs in the search space set exclude the CCEs with overlapping; within the same search space set, the existence of overlapping CCEs means that the indexes of the CCEs are the same. It can be understood by those skilled in the art that for the statistical approach (counting rules) of the number of non-overlapping CCEs in the search space set, reference can be made to the related description in the prior art. Specifically, if CCEs correspond to different CORESET indexes, or CCEs correspond to the same CORESET index, but the monitoring start symbols of the search space sets for receiving the respective candidate PDCCHs are different, CCEs with the same index are counted as not overlapping. Specifically, the larger the number of non-overlapping CCEs in the search space set is, the larger the number of CCEs that the UE needs to perform blind detection in the search space set is. Since the UE has limited capability, that is, the number of CCEs that the UE can perform blind detection is limited, in order to maximize the number of search space sets for the UE to perform blind detection, the first priority may be determined with reference to the number of CCEs that do not overlap.

Referring to fig. 2, the search space set 1 and the search space set 2 have 20 CCEs, and the indexes (CCE indexes) are 0 to 19, respectively. The numerically shown part in fig. 2 is a PDCCH candidate. Wherein the candidate PDCCHs in different rows represent PDCCH candidates having different aggregation levels.

In the search space set 1, the number of non-overlapping CCEs in the search space set is 20, that is, all CCEs are occupied by PDCCH candidates. In search space set 2, the number of non-overlapping CCEs within the search space set is 16, with

indexes

2, 4, 5, and 7-19 CCEs, respectively. Thus, the number of non-overlapping CCEs in search space set 1 is greater than the number of non-overlapping CCEs in search space set 2, and the first priorities of search space set 1 and search space set 2 are different.

In particular implementations, the first priority of the search space set 1 may be greater than the first priority of the search space set 2, or may be less than the first priority of the search space set 2.

The search space set has an Identity (ID), and the size of the Identity may indicate the arrangement order of the search space set. Specifically, the UE may have a maximum of 40 search space sets on one Cell (Cell). When the base station allocates the search space set, the base station may allocate a plurality of search space sets according to the ID, and allocate ID 0 first and then allocate

ID

1, 2, …, N.

In a specific implementation of step S102, a second priority of the set of search spaces may be determined according to an identified size of the set of search spaces. Specifically, the second priority of the search space set with a smaller ID may be higher; the second priority may also be higher for search space sets with larger IDs.

For example, the smaller the identification of the search space set, the higher the second priority of the search space set; when monitoring the search space set, the UE will monitor the search space set with smaller identifier first and then the search space set with larger identifier.

Downlink Control Information (DCI) is carried by a PDCCH candidate in a search space set. . The downlink control information in different formats carries different information, and thus the importance of the downlink control information in different formats is different.

In the specific implementation of step S102, the second priority of the search space set may also be determined according to the format of the downlink control information in the search space set. Specifically, the format of the downlink control information indicates that the higher the importance of the information carried by the downlink control information is, the higher the second priority of the search space set in which the downlink control information is located is.

In the embodiment of the invention, the quantity of non-overlapping CCEs in a search space set is positively correlated with the quantity of CCEs required to be subjected to channel estimation by UE, and a base station determines the first priority of the search space set according to the quantity of the non-overlapping CCEs; the size of the identifier of the search space set can represent the sequence of the search space set, and the format of the downlink control information in the search space set represents the importance degree of the information carried by the search space set, so that the base station determines the second priority according to the information, and the UE can have more monitoring opportunities when monitoring the candidate PDCCH according to the first priority and the second priority, thereby reducing the probability of missed detection and improving the success rate of blind detection.

In practical application, when monitoring the candidate PDCCH, the UE will first determine a search space set to be blind-checked according to a first priority, and then determine the search space set to be blind-checked according to a second priority.

In a preferred embodiment of the present invention, after step S102 shown in fig. 1, the following steps may be further included:

for the search space set with the same second priority, dividing a plurality of candidate PDCCHs with different aggregation levels in the search space set into a plurality of candidate groups, wherein CCEs occupied by the candidate PDCCHs in each candidate group are overlapped; determining a third priority of the plurality of candidate groups in order of the number of overlapping CCEs.

In the present embodiment, the aggregation level of PDCCH candidates refers to the number of consecutive CCEs allocated to the PDCCH candidate. For example, the aggregation level AL of the PDCCH candidate is 1, which indicates that the number of consecutive CCEs occupied by the PDCCH candidate is 1, and the UE needs to perform channel estimation on at least 1 CCE in one blind detection; the aggregation level AL of the PDCCH candidate is 16, which indicates that the number of consecutive CCEs occupied by the PDCCH candidate is 16, and the UE needs to perform channel estimation on at least 16 CCEs in one blind detection.

The overlapping of CCEs occupied by the candidate PDCCHs in each candidate group means that indexes of CCEs occupied by the candidate PDCCHs of a plurality of aggregation levels in the candidate group are partially or completely the same.

The more the number of overlapped CCEs occupied by the candidate PDCCH in the candidate group is, the more the number of channel estimation times which can be saved when the UE is in blind detection is represented; or, when the UE blindly detects the same number of CCEs, the more the number of overlapping CCEs is, the more the number of PDCCH candidates is, and the lower the missed detection probability is.

Thus, the higher the number of overlapping CCEs within a candidate group, the higher the third priority of the candidate group; conversely, the lower the third priority of the candidate set.

Referring to fig. 3, in the search space set shown in fig. 3, the search space set has five aggregation levels, which are aggregation level AL of 1, aggregation level AL of 2, aggregation level AL of 4, aggregation level AL of 8, and aggregation level AL of 16.

And dividing a plurality of candidate groups according to whether CCEs occupied by the candidate PDCCHs are overlapped or not. Specifically, in candidate group 1, candidate PDCCHs with aggregation levels AL of 1, 2, 4, and 8 and candidate PDCCHs with aggregation level AL of 16 have an overlap in CCEs with indices of 16 to 31. In candidate group 2, candidate PDCCHs with aggregation levels AL of 1, 2, and 4 and candidate PDCCHs with aggregation level AL of 8 have an overlap in CCEs with indices of 8 to 15; in candidate group 3, candidate PDCCHs with an aggregation level AL of 1 and candidate PDCCHs with an aggregation level AL of 2 overlap in CCEs with indices of 6 and 7; within candidate group 4, there are only PDCCH candidates with aggregation level AL of 1 and occupying CCE with index 3.

Within candidate set 1, the number of overlapping CCEs is 16; within candidate set 2, the number of overlapping CCEs is 8; within candidate set 3, the number of overlapping CCEs is 2; within candidate set 4, the number of overlapping CCEs is 1. Thus, the third priority is, in order from high to low, candidate group 1, candidate group 2, candidate group 3, and candidate group 4.

Further, step S102 shown in fig. 1 may further include the following steps: and determining the fourth priority of each candidate PDCCH in the candidate group according to the high-low order of the aggregation level in the same candidate group.

After the third priority of the candidate group is determined, the priority order of each PDCCH in the candidate group may be determined.

In this embodiment, the fourth priority of the PDCCH candidates may be determined in the order of the aggregation level.

Specifically, the higher the aggregation level of the PDCCH candidate, the higher the fourth priority of the PDCCH candidate. For example, within the same candidate group, the fourth priority of the PDCCH candidate with aggregation level 16 is higher than the fourth priority of the PDCCH candidate with aggregation level 8; the fourth priority of the PDCCH candidate with the aggregation level of 8 is higher than the fourth priority of the PDCCH candidate with the aggregation level of 4; the fourth priority of the candidate PDCCH with the aggregation level of 4 is higher than the fourth priority of the candidate PDCCH with the aggregation level of 2; the fourth priority of the PDCCH candidate of aggregation level 2 is higher than the fourth priority of the PDCCH candidate of aggregation level 1.

In this case, the UE will preferentially monitor candidate PDCCHs with higher aggregation levels within the same candidate group. Therefore, on the premise that the channel estimation capability of the UE is limited, the UE can monitor more candidate PDCCHs, and the blind detection success rate is improved.

In a variation of the present invention, step S102 shown in fig. 1 may further include the following steps: and in the same candidate group, determining the fifth priority according to the size of the index of each candidate PDCCH with the same aggregation level in the candidate group.

The indices of different candidate PDCCHs are different.

The present embodiment may determine the fifth priority according to the size of the index of each PDCCH candidate. For example, the smaller the index of the candidate PDCCH, the higher its fifth priority.

Further, the fourth priority may be determined before the fifth priority. That is, for candidate PDCCHs of the same candidate group aggregation level, the fifth priority is determined according to the size of the index of each candidate PDCCH.

For example, as shown in fig. 3, among PDCCH candidates having an aggregation level of 1 in candidate group 1, the fifth priority is PDCCH candidate 0, PDCCH candidate 1, PDCCH candidate 2, and PDCCH candidate 3 in order from high to low. The determination method of the fifth priority among the PDCCH candidates of other aggregation levels is as described above, and is not described here again.

With continued reference to fig. 3, in the search space set shown in fig. 3, in combination with the third priority, the fourth priority and the fifth priority, the priorities are, in order from high to low: candidate PDCCH0 with aggregation level 16; candidate PDCCH0 with aggregation level 8; candidate PDCCH1 with aggregation level 4; PDCCH candidate 1 and PDCCH candidate 2 with aggregation level 2; PDCCH candidate 0, PDCCH candidate 1, PDCCH candidate 2, and PDCCH candidate 3 having an aggregation level of 1. Candidate PDCCH1 with aggregation level 8; candidate PDCCH0 with aggregation level 4; PDCCH candidate 6 and PDCCH candidate 7 with aggregation level 1; candidate PDCCH0 with aggregation level 2; candidate PDCCH5 with aggregation level 1; candidate PDCCH4 with aggregation level 1. In other words, the UE may monitor the PDCCH candidates according to the above sequence until the number of blind tests or CCEs with limited capability is reached, or until the blind tests are successful.

In a specific application scenario of the present invention, the UE may determine the search space set to be blind-checked according to a first priority, and then determine the search space set to be blind-checked according to a second priority; determining a candidate group to be subjected to blind detection according to a third priority; determining candidate PDCCHs to be subjected to blind detection according to the fourth priority; and finally, determining candidate PDCCHs to be subjected to blind detection according to the fifth priority.

With continued reference to fig. 1, in an embodiment of the present invention, step S101 shown in fig. 1 may include the following steps: determining that the first priority of the non-overlapping CCE larger-number search space set is higher than the first priority of the non-overlapping CCE smaller-number search space set; or, determining that the first priority of the search space set with the smaller number of non-overlapping CCEs is higher than the first priority of the search space set with the larger number of non-overlapping CCEs.

In this embodiment, if the first priority of the search space set with the larger number of non-overlapping CCEs is higher than the first priority of the search space set with the smaller number of non-overlapping CCEs, the UE may perform blind detection on more search space sets when performing blind detection, so as to reduce the probability of missed detection.

Specifically, if the first priority of the non-overlapping CCE search space set with a smaller number is higher than the first priority of the non-overlapping CCE search space set with a larger number, the UE may perform blind detection on the non-overlapping CCE search space set with a smaller number first.

In an embodiment of the present invention, step S102 shown in fig. 1 may include the following steps: determining a second priority of each search space set according to the size sequence of the identifier of each search space set; and/or determining a second priority of the search space set comprising the downlink control information with the format of 0_0, 1_0, 2_1, 2_2 or 2_3 to be higher than a second priority of the search space set comprising the downlink control information with the format of other formats.

In this embodiment, the information carried by the downlink control information with the format (format) of 0_0 and 1_0 is more important than the downlink control information with other formats. The downlink control information with the format of 2_0 is used for indicating a time slot structure, and the downlink control information with the format of 2_1 is used for preempting indication. Information carried by downlink control information with the format of 2_0, 2_1, 2_2, or 2_3 belongs to group information (group signaling), and all of them are important.

The downlink control information in other formats may be the downlink control information in formats 0_1 and 1_ 1.

Referring to fig. 4, the method for monitoring candidate PDCCHs may be used on the UE side, and the method for monitoring candidate PDCCHs may include the following steps:

step S401: for the search space sets of the same type, monitoring the search space sets respectively according to the first priority of each search space set, wherein the first priority is determined according to the quantity of non-overlapping CCEs in each search space set;

step S402: and for the search space sets with the same first priority, monitoring the search space sets according to the second priority of each search space set, wherein the second priority is determined according to the size of the identifier of each search space set and/or the format of downlink control information in each search space set.

In the embodiment of the invention, the quantity of non-overlapping CCEs in a search space set in the search space set is positively correlated with the quantity of CCEs required to be subjected to channel estimation by UE, and a base station determines the first priority of the search space set according to the quantity of the non-overlapping CCEs; the size of the identifier of the search space set can represent the sequence of the search space set, and the format of the downlink control information in the search space set represents the importance degree of the information carried by the search space set, so that the base station determines the second priority according to the information, and the UE can have more monitoring opportunities when monitoring the candidate PDCCH according to the first priority and the second priority, thereby reducing the probability of missed detection and improving the success rate of blind detection.

The monitoring method of the candidate PDCCH shown in fig. 4 may further include the following steps: and for the search space sets with the same second priority, monitoring the candidate groups respectively according to the third priority of each candidate group, wherein the candidate groups are obtained by dividing a plurality of candidate PDCCHs with different aggregation levels in the search space sets, and CCEs (control channels element) occupied by the candidate PDCCHs in each candidate group are overlapped.

Further, the monitoring method of the candidate PDCCH may further include the steps of: and respectively monitoring the candidate PDCCHs according to the fourth priority of each candidate PDCCH in the same candidate group, wherein the fourth priority is determined according to the high-low order of the aggregation level.

In a variation of the present invention, the method for monitoring candidate PDCCHs may further include: and in the same candidate group, monitoring the candidate PDCCHs according to the fifth priority of each candidate PDCCH, wherein the fifth priority is determined according to the size of the index of each candidate PDCCH in the candidate group.

In an embodiment of the present invention, the method shown in fig. 4 may further include the following steps: in the monitoring process, when the monitoring times reach the preset times or the number of CCEs used for channel estimation exceeds a preset threshold value, the monitoring is finished.

In this embodiment, because the blind detection capability of the UE is limited, the UE can monitor the preset number of times or perform channel estimation on the CCEs whose number is the preset threshold. When the monitoring times of the UE or the number of CCEs for channel estimation reaches the capability of the UE, the monitoring process is ended.

It is understood that the preset times and the preset threshold may be configured in advance, and the embodiment of the present invention is not limited thereto.

Referring to fig. 5, an embodiment of the present invention further discloses a device 50 for determining the priority of a candidate PDCCH, and the device 50 for determining the priority of a candidate PDCCH may be used on the base station side. The apparatus 50 for prioritizing candidate PDCCHs may include a first prioritization module 501 and a second prioritization module 502.

The first priority determining module 501 is adapted to determine, for search space sets of the same type, a first priority of each search space set according to the number of non-overlapping CCEs in the search space set;

the second priority determining module 502 is adapted to determine, for the search space sets with the same first priority, the second priority of each search space set according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set.

The apparatus 50 for determining the priority of the PDCCH candidate may be internally integrated or externally coupled to the base station.

In a preferred embodiment of the present invention, the apparatus 50 for determining the priority of the candidate PDCCHs may further include a candidate group dividing module (not shown), which is adapted to divide a plurality of candidate PDCCHs with different aggregation levels in the search space set into a plurality of candidate groups for the search space set with the same second priority, where CCEs occupied by the candidate PDCCHs in each candidate group overlap; a third priority determining module (not shown) adapted to determine a third priority of the plurality of candidate groups in order of the number of overlapping CCEs.

In the embodiment of the invention, the more the number of overlapped CCEs occupied by the candidate PDCCHs in the candidate group is, the more the number of channel estimation times can be saved when UE blind detection is shown; therefore, the base station determines the third priority according to the number of the overlapped CCEs, so that when the UE monitors the candidate PDCCH according to the third priority, the efficiency of channel estimation is high, and the success rate of blind detection is further improved.

Further, the apparatus 50 for determining the priority of PDCCH candidates may further include a fourth priority determining module (not shown) adapted to determine the fourth priority of each PDCCH candidate in the candidate group according to the order of aggregation level in the same candidate group.

Optionally, the apparatus 50 for determining the priority of PDCCH candidates may further include a fifth priority determining module (not shown) adapted to determine a fifth priority within the same candidate group according to the size of the index of each PDCCH candidate within the candidate group.

In an embodiment of the present invention, the first priority determining module 501 shown in fig. 5 may include a first determining unit (not shown) adapted to determine that the first priority of the non-overlapping CCE aggregation with a larger number of search spaces is higher than the first priority of the non-overlapping CCE aggregation with a smaller number of search spaces;

a second determining unit (not shown) adapted to determine that the first priority of the non-overlapping CCE-less search space set is higher than the first priority of the non-overlapping CCE-greater search space set.

In another embodiment of the present invention, the second priority determining module 502 shown in fig. 5 may include a third determining unit (not shown) adapted to determine the second priority of each search space set according to the size order of the identifier of each search space set; a fourth determining unit (not shown) is adapted to determine that the second priority of the search space set comprising the downlink control information with the format 0_0, 1_0, 2_1, 2_2, or 2_3 is higher than the second priority of the search space set comprising the downlink control information with the format other than the format.

In the embodiment of the present invention, compared with downlink control information in other formats, the importance of information carried by downlink control information in the format 0_0, 1_0, 2_1, 2_2, or 2_3 is higher, and the second priority of the search space set in which the information is located can be set to be higher; the UE can preferentially monitor the downlink control information, so that the UE service is prevented from being influenced, the UE service is optimized, and the communication efficiency and the user experience are improved.

For more details of the operation principle and operation manner of the PDCCH candidate priority determining apparatus 50, reference may be made to the relevant descriptions in fig. 1 to fig. 4, which are not repeated here.

Referring to fig. 6, the apparatus 60 for monitoring candidate PDCCH may be used at UE side, and the apparatus 60 for monitoring candidate PDCCH may include a first monitoring module 601 and a second monitoring module 602.

The first monitoring module 601 is adapted to monitor search space sets of the same type according to a first priority of each search space set, where the first priority is determined according to the number of non-overlapping CCEs in each search space set; the second monitoring module 602 is adapted to monitor the search space sets with the same first priority according to a second priority of each search space set, where the second priority is determined according to the size of the identifier of each search space set and/or the format of the downlink control information in each search space set.

In a preferred embodiment of the present invention, the apparatus 60 for monitoring candidate PDCCHs shown in fig. 6 may further include a candidate group monitoring module 603, adapted to monitor the candidate groups according to a third priority of each candidate group for the search space set having the same second priority, where the candidate groups are obtained by dividing a plurality of candidate PDCCHs having different aggregation levels in the search space set, and CCEs occupied by the candidate PDCCHs in each candidate group overlap.

Further, the apparatus 60 for monitoring PDCCH candidates shown in fig. 6 may further include a first PDCCH candidate monitoring module 604, which is adapted to monitor the PDCCH candidates according to a fourth priority of each PDCCH candidate in the same candidate group, where the fourth priority is determined according to the order of aggregation levels.

Optionally, the apparatus 60 for monitoring PDCCH candidates shown in fig. 6 may further include a second PDCCH candidate monitoring module 605, adapted to monitor the PDCCH candidates according to a fifth priority of each PDCCH candidate in the same candidate group, where the fifth priority is determined according to the size of the index of each PDCCH candidate in the candidate group

In a preferred embodiment of the present invention, the apparatus 60 for monitoring the PDCCH candidate shown in fig. 6 may further include a determining module 606, which is adapted to terminate the monitoring when the number of monitoring times reaches a preset number or the number of CCEs used for channel estimation exceeds a preset threshold in the monitoring process.

For more details of the operation principle and the operation mode of the PDCCH candidate monitoring apparatus 60, reference may be made to the relevant descriptions in fig. 1 to fig. 4, which are not described herein again.

The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of the method for determining the priority of the candidate PDCCH shown in FIG. 1 or the steps of the method for monitoring the candidate PDCCH shown in FIG. 4 can be executed. The storage medium may include ROM, RAM, magnetic or optical disks, etc. The storage medium may further include a non-volatile memory (non-volatile) or a non-transitory memory (non-transient), and the like.

The embodiment of the invention also discloses a base station which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method for prioritizing candidate PDCCHs shown in fig. 1.

The embodiment of the invention also discloses a terminal which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the monitoring method for candidate PDCCHs shown in fig. 4. The terminal includes, but is not limited to, a mobile phone, a computer, a tablet computer and other terminal devices.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for determining priority of PDCCH candidates, comprising:

for the search space sets of the same type, determining a first priority of each search space set according to the quantity of non-overlapping CCEs in each search space set;

for the search space sets with the same first priority, determining a second priority of each search space set according to the size of the identifier of the search space set,

or, for the search space sets with the same first priority, determining the second priority of the search space set according to the format of the downlink control information in each search space set,

or, for the search space sets with the same first priority, determining a second priority of each search space set according to the size of the identifier of each search space set and the format of the downlink control information in each search space set, where the format of the downlink control information indicates the importance of the downlink control information, and the second priority of the search space set where the downlink control information with higher importance is located is higher than the second priority of the search space set where the downlink control information with lower importance is located.

2. The method of prioritizing candidate PDCCHs according to claim 1, further comprising:

for the search space set with the same second priority, dividing a plurality of candidate PDCCHs with different aggregation levels in the search space set into a plurality of candidate groups, wherein CCEs occupied by the candidate PDCCHs in each candidate group are overlapped;

determining the third priority levels of the plurality of candidate groups according to the high-low order of the number of the overlapped CCEs, wherein the third priority level of the candidate group with higher number of the overlapped CCEs is higher than that of the candidate group with lower number of the overlapped CCEs.

3. The method of prioritizing candidate PDCCHs according to claim 2, further comprising:

and determining the fourth priority of each candidate PDCCH in the candidate group according to the high-low order of the aggregation level in the same candidate group.

4. The method of prioritizing candidate PDCCHs according to claim 2, further comprising:

and in the same candidate group, determining a fifth priority according to the size of the index of each candidate PDCCH in the candidate group.

5. The method of claim 1, wherein the determining the first priority of each search space set according to the number of non-overlapping CCEs in the search space set comprises:

determining that the first priority of the non-overlapping CCE larger-number search space set is higher than the first priority of the non-overlapping CCE smaller-number search space set;

or, determining that the first priority of the search space set with the smaller number of non-overlapping CCEs is higher than the first priority of the search space set with the larger number of non-overlapping CCEs.

6. The method of claim 1, wherein the determining the second priority of each search space set according to the size of the identifier of the search space set and/or the format of downlink control information in the search space set comprises:

determining a second priority of each search space set according to the size sequence of the identifier of each search space set;

and/or determining a second priority of the search space set comprising the downlink control information with the format of 0_0, 1_0, 2_1, 2_2 or 2_3 to be higher than a second priority of the search space set comprising the downlink control information with the format of other formats.

7. A method for monitoring a PDCCH candidate, comprising:

for the search space sets of the same type, monitoring the search space sets respectively according to the first priority of each search space set, wherein the first priority is determined according to the quantity of non-overlapping CCEs in each search space set;

for the search space sets with the same first priority, monitoring the search space sets according to the second priority of each search space set, wherein the second priority is determined according to the size of the identifier of each search space set,

8. The method of monitoring the PDCCH candidate according to claim 7, further comprising:

and for the search space sets with the same second priority, monitoring the candidate groups respectively according to the third priority of each candidate group, wherein the candidate groups are obtained by dividing a plurality of candidate PDCCHs with different aggregation levels in the search space sets, CCEs (control channels) occupied by the candidate PDCCHs in each candidate group are overlapped, and the third priority represents the high-low order of the number of the overlapped CCEs.

9. The method of claim 8, further comprising:

and respectively monitoring the candidate PDCCHs according to the fourth priority of each candidate PDCCH in the same candidate group, wherein the fourth priority is determined according to the high-low order of the aggregation level.

10. The method of claim 8, further comprising:

and in the same candidate group, monitoring the candidate PDCCHs according to the fifth priority of each candidate PDCCH, wherein the fifth priority is determined according to the size of the index of each candidate PDCCH in the candidate group.

11. The method of monitoring the PDCCH candidate according to claim 7, further comprising:

in the monitoring process, when the monitoring times reach the preset times or the number of CCEs used for channel estimation exceeds a preset threshold value, the monitoring is finished.

12. An apparatus for prioritizing candidate PDCCHs, comprising:

the first priority determining module is suitable for determining the first priority of the search space set according to the quantity of non-overlapping CCEs (control channel elements) in each search space set for the same type of search space sets;

a second priority determination module adapted to determine, for the search space sets having the same first priority, a second priority of each search space set according to the size of the identifier of the search space set,

13. The apparatus for prioritizing candidate PDCCHs according to claim 12, further comprising:

a candidate group division module, adapted to divide, for the search space set having the same second priority, a plurality of candidate PDCCHs having different aggregation levels in the search space set into a plurality of candidate groups, where CCEs occupied by the candidate PDCCHs in each candidate group overlap;

and the third priority determining module is suitable for determining the third priority of the plurality of candidate groups according to the high-low order of the number of the overlapped CCEs, wherein the third priority of the candidate group with higher number of the overlapped CCEs is higher than that of the candidate group with lower number of the overlapped CCEs.

14. The apparatus for prioritizing candidate PDCCHs according to claim 13, further comprising:

and the fourth priority determining module is suitable for determining the fourth priority of each candidate PDCCH in the candidate group according to the high-low order of the aggregation level in the same candidate group.

15. The apparatus for prioritizing candidate PDCCHs according to claim 13, further comprising:

and the fifth priority determining module is suitable for determining a fifth priority according to the size of the index of each candidate PDCCH in the candidate group in the same candidate group.

16. The apparatus for prioritizing candidate PDCCHs according to claim 12, wherein the first prioritization module comprises:

a first determining unit adapted to determine that a first priority of the non-overlapping CCE large-number search space set is higher than a first priority of the non-overlapping CCE small-number search space set;

a second determining unit adapted to determine that the first priority of the non-overlapping CCE-less search space set is higher than the first priority of the non-overlapping CCE-greater search space set.

17. The apparatus for prioritizing candidate PDCCHs according to claim 12, wherein the second prioritization module comprises:

a third determining unit, adapted to determine a second priority of each search space set according to the size order of the identifier of each search space set;

a fourth determining unit adapted to determine a second priority of the search space set comprising the downlink control information of format 0_0, 1_0, 2_1, 2_2, or 2_3 higher than a second priority of the search space set comprising the downlink control information of format other than format.

18. An apparatus for monitoring candidate PDCCH, comprising:

the first monitoring module is suitable for monitoring the search space sets of the same type according to the first priority of each search space set, wherein the first priority is determined according to the quantity of non-overlapping CCEs in each search space set;

a second monitoring module, adapted to monitor the search space sets with the same first priority according to a second priority of each search space set, where the second priority is determined according to the size of the identifier of each search space set,

19. The apparatus for monitoring candidate PDCCH according to claim 18, further comprising:

and the candidate group monitoring module is suitable for monitoring the candidate groups according to the third priority of each candidate group for the search space sets with the same second priority, the candidate groups are obtained by dividing a plurality of candidate PDCCHs with different aggregation levels in the search space sets, CCEs occupied by the candidate PDCCHs in each candidate group are overlapped, and the third priority represents the high-low order of the number of the overlapped CCEs.

20. The apparatus for monitoring candidate PDCCH according to claim 19, further comprising:

and the first candidate PDCCH monitoring module is suitable for monitoring the candidate PDCCHs respectively according to the fourth priority of each candidate PDCCH in the same candidate group, and the fourth priority is determined according to the high-low order of the aggregation level.

21. The apparatus for monitoring candidate PDCCH according to claim 19, further comprising:

and the second candidate PDCCH monitoring module is suitable for respectively monitoring the candidate PDCCHs according to the fifth priority of each candidate PDCCH in the same candidate group, and the fifth priority is determined according to the size of the index of each candidate PDCCH in the candidate group.

22. The apparatus for monitoring candidate PDCCH according to claim 18, further comprising:

and the judging module is suitable for ending the monitoring when the monitoring times reach the preset times or the number of CCEs used for channel estimation exceeds a preset threshold value in the monitoring process.

23. A computer readable storage medium having stored thereon computer instructions, wherein the computer instructions when executed perform the steps of the method for prioritizing candidate PDCCHs according to any one of claims 1 to 6 or the method for monitoring candidate PDCCHs according to any one of claims 7 to 11.

24. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method for prioritizing candidate PDCCHs according to any one of claims 1 to 6.

25. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method for listening for PDCCH candidates according to any of the claims 7 to 11.