CN112751649A

CN112751649A - Physical downlink control channel blind detection method and device

Info

Publication number: CN112751649A
Application number: CN202011498150.1A
Authority: CN
Inventors: 李环宇
Original assignee: WUHAN HONGXU INFORMATION TECHNOLOGY CO LTD
Current assignee: WUHAN HONGXU INFORMATION TECHNOLOGY CO LTD
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-05-04
Anticipated expiration: 2040-12-17
Also published as: CN112751649B

Abstract

The invention provides a blind detection method and a device for a physical downlink control channel, wherein the method comprises the following steps: determining each candidate set under each aggregation level of each search space according to the search space type and a candidate set initial position formula; respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level; and carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing. According to the blind detection method and the blind detection device for the physical downlink control channel, the candidate sets under each aggregation level of each search space are respectively sorted according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level, the blind detection of the physical downlink control channel is respectively carried out according to the sequence of each candidate set determined by sorting of each search space, the blind detection result can be obtained more quickly, and the blind detection efficiency can be improved.

Description

Physical downlink control channel blind detection method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for blind detection of a physical downlink control channel.

Background

In the 5G NR, Frequency domain scheduling range information of a Physical Downlink Control Channel (PDCCH) and time domain OFDM (Orthogonal Frequency Division Multiplexing) symbol number information are encapsulated in a CORESET (Control-resource set), and a Control Channel Element (CCE) is used as a basic resource unit in the CORESET. One CCE is composed of 6 REGs (Resource Element Group), and one REG is composed of a time domain symbol and 12 consecutive subcarriers in the frequency domain jointly; information such as time domain start symbol information and detection period is encapsulated in a Search Space (Search Space). The UE (User Equipment) can only know that the PDCCH is transmitted in the RB (Resource Block) of a set of physical resources, core set, but cannot determine which RBs to transmit. Therefore, after the PDCCH channel determines the physical resource information, the search space type, and other information, the UE may search the PDCCH on the CORESET according to different RNTI (Radio Network temporary Identity) types in different search spaces, because the UE does not explicitly know the time-frequency position of the PDCCH transmission, and can only demodulate the candidate set of the PDCCH without stop, this process is called as blind detection of the PDCCH. The Search Space is divided into a Common Search Space (CSS) and a UE Special Search Space (UE Special Search Space), where the CSS is used for scheduling of Common information and the USS is used for scheduling of specific user information.

In 5G NR, the PDCCH is aggregated from resources of five CCE sizes, 1, 2, 4, 8, and 16, and different CCE sizes correspond to different aggregation levels. Therefore, when the UE blindly detects DCI information at the receiving end, it needs to perform sequential demodulation in different candidate sets by using different ALs.

The existing 5G PDCCH blind detection algorithm comprises a poor search method, blind detection based on power distribution, blind detection based on a channel change rule and the like. The poor search method carries out blind detection in sequence according to a protocol mode, and has the defects that candidate sets under different aggregation levels are not sorted, and the average blind detection times are more; the blind detection based on the channel change rule has the defects that the CQI (channel quality indicator) of the reference quantity of channel change needs to be analyzed to be uplink, and the complexity is higher; blind detection based on power allocation has the disadvantage that most techniques rank the candidates based on CQI. In conclusion, the existing 5G PDCCH blind detection algorithms all have the defect of low detection efficiency.

Disclosure of Invention

The invention provides a blind detection method and a blind detection device for a physical downlink control channel, which are used for solving the defect of low efficiency in the prior art and realizing more efficient blind detection of the physical downlink control channel.

The invention provides a blind detection method of a physical downlink control channel, which comprises the following steps:

determining each candidate set under each aggregation level of each search space according to the search space type and a candidate set initial position formula;

respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level;

and carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing.

According to the blind detection method of the physical downlink control channel provided by the invention, the specific steps of respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level comprise:

acquiring a power index value of each CCE according to whether the power of each CCE is occupied by each candidate set under the minimum aggregation level;

and for each candidate set under each aggregation level of each search space, determining the sequence of each candidate set under each aggregation level of the search space according to the power index value of each CCE included in each candidate set.

According to the blind detection method of the physical downlink control channel provided by the invention, the specific step of acquiring the power index value of each CCE according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level comprises the following steps:

for any CCE, if the CCE is occupied by any candidate set under the minimum aggregation level and the power is smaller than a preset power threshold, determining the power index value of the CCE as 1/alpha; if the power of any CCE is larger than the power threshold and is occupied by any candidate set under the minimum aggregation level, determining the power index value of the CCE as alpha; if any CCE is not occupied by any candidate set under the minimum aggregation level, determining the power index value of the CCE as 1;

wherein α is greater than 1.

According to the blind detection method of the physical downlink control channel provided by the present invention, the specific step of determining the order of each candidate set in each aggregation level of the search space according to the power index value of each CCE included in each candidate set for each candidate set in each aggregation level of the search space includes:

the candidate set including the CCEs having the larger power index value product is ordered before the candidate set including the CCEs having the smaller power index value product.

According to the blind detection method for the physical downlink control channel provided by the present invention, for each candidate set of each aggregation level in each search space, determining the order of each candidate set of each aggregation level in the search space according to the power index value of each CCE included in each candidate set further includes:

for a plurality of candidate sets having equal products of power index values of the CCEs, the candidate sets having a smaller number of CCEs having power index values of 1/α are ranked before the candidate sets having a larger number of CCEs having power index values of 1/α.

According to the blind detection method for the physical downlink control channel provided by the present invention, the specific step of determining the order of each candidate set in each aggregation level of the search space according to the power index value of each CCE included in each candidate set for each candidate set in each aggregation level of the search space further includes:

for a plurality of candidate sets having the same number of CCEs having power index values of 1/α, a candidate set having a larger sum of power index values of the CCEs is ranked before a candidate set having a smaller sum of power index values of the CCEs.

and for a plurality of candidate sets with the equal sum of the power index values of all CCEs, sorting the candidate sets from small to large according to the overall indexes of the candidate sets.

The invention also provides a blind detection device for the physical downlink control channel, which comprises the following components:

the candidate determining module is used for determining each candidate set under each aggregation level of each search space according to the search space type and the candidate set starting position formula;

the sequencing module is used for respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level;

and the blind detection module is used for carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing.

The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the steps of any one of the methods for blind detection of the physical downlink control channel when executing the program.

The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when being executed by a processor, implements the steps of the physical downlink control channel blind detection method according to any one of the above.

According to the blind detection method and the blind detection device for the physical downlink control channel, the candidate sets under each aggregation level of each search space are respectively sequenced according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level, and for each search space, the blind detection for the physical downlink control channel is respectively performed according to the sequence of each candidate set determined according to the sequencing of the search space, so that the blind detection result can be obtained more quickly, and the blind detection efficiency can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a blind detection method for a physical downlink control channel according to the present invention;

fig. 2 is a schematic flowchart of a blind detection method for a physical downlink control channel in a CSS space according to the present invention;

fig. 3 is a schematic flowchart of a blind detection method for a physical downlink control channel in a USS space according to the present invention;

fig. 4 is a schematic flowchart of a blind detection method for a physical downlink control channel according to the present invention;

fig. 5 is a schematic diagram of a control resource set involved in a blind detection method for a physical downlink control channel according to the present invention;

fig. 6 is a schematic structural diagram of a physical downlink control channel blind detection apparatus provided in the present invention;

fig. 7 is a schematic structural diagram of an electronic device provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In order to overcome the above problems in the prior art, embodiments of the present invention provide a method and an apparatus for blind detection of a physical downlink control channel, where the inventive concept is to provide a PDCCH blind detection algorithm of a 5G system based on power detection sequencing on the basis of an exhaustive method, the algorithm sequences candidate sets of different ALs (Aggregation levels), performs blind detection in sequence according to the sequencing, and terminates the blind detection after the CRC check of the blind detection passes.

Fig. 1 is a flowchart illustrating a blind detection method for a physical downlink control channel according to an embodiment of the present invention. The following describes a physical downlink control channel blind detection method according to an embodiment of the present invention with reference to fig. 1. As shown in fig. 1, the method includes: step S101, determining each candidate set under each aggregation level of each search space according to the search space type and the candidate set starting position formula.

Specifically, according to the TS 38.213 protocol, the starting positions of candidate sets of different aggregation levels are determined by the following formula

Wherein L represents an aggregation level; p (0)<p<3) an index representing CORESET; s (0)<s<10) represents a search related to CORESETAn index of the space;

indicating the time slot index of the search space under the condition of the frame number f under the condition of the subcarrier interval indicated value mu, N_CCE,pNumber of CCEs representing CORESET P;

wherein the content of the first and second substances,

indicating that the UE under the condition of aggregation level L is configured to monitor the number of PDCCH candidates in the search space s; n is_CIAnd the carrier index value represents the carrier index value configured by the high layer, and is 0 if not configured.

In addition, M is_p,s,maxConfigured by higher layer parameters, M_p,s,max≤floor(N_CCE,pL). The embodiment of the invention does not consider the condition of carrier aggregation, therefore, M_p,s,maxMax ═ n in_CI＝0。

The search space types include a common search space (abbreviated as "common search space") CSS and a UE-specific search space (abbreviated as "dedicated search space") USS.

In the case of the CSS, the,

it means that the starting position of the first candidate set of the public search space is 0.

For the case of the USS,

Y_p,-1＝n_RNTInot equal to 0. If pmod3 is 0, A_p39827; if pmod3 is equal to 1, A_p39829; if pmod3 is 2, A_p＝39839。D＝65537，i＝0,…,L-1。n_RNTIAnd C-RNTI is shown, which indicates that indexes of PDCCH candidate sets of the dedicated search spaces of different UEs are different.

According to the starting position of the candidate set of the public search space and each aggregation level, the position of each candidate set of the public search space under the aggregation level can be obtained.

According to the initial position of the candidate set of the dedicated search space and each aggregation level, the position of each candidate set of the dedicated search space under the aggregation level can be obtained.

Step S102, according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level, the candidate sets under each aggregation level of each search space are respectively sequenced.

Specifically, each candidate set in each aggregation level of the common search space may be obtained according to the starting position of the candidate set in the common search space.

According to the initial position of the candidate set of the special search space, each candidate set under each aggregation level of the special search space can be obtained.

For each search space, the RB carrying the PDCCH occupies a plurality of consecutive CCEs at a certain aggregation level, so that the CCEs are occupied by each candidate set at the minimum aggregation level, and the probability of whether the CCEs belong to the RB carrying the PDCCH can be reflected to a certain extent.

Since the power of the CCE occupied by the RB carrying PDCCH is higher than the power of the CCE not occupied by the RB carrying PDCCH, the power of the CCE may reflect the probability of whether or not the CCE belongs to the RB carrying PDCCH to some extent.

Combining the above two aspects, for each search space, the candidate sets under the aggregation levels of the search space may be sorted according to the power sum of each CCE and whether the CCE is occupied by the candidate sets under the minimum aggregation level.

The purpose of the ranking is to rank the RBs carrying the PDCCH at a relatively front position, so that the result of blind detection can be obtained by detecting a small number of candidate sets with a small number of detections.

And step S103, carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing.

Specifically, the sorted candidate sets may be stored locally, and may be used for later blind demodulation.

And for each search space, sequencing the determined sequence of each candidate set according to the search space, and sequentially performing blind detection on the physical downlink control channel for each candidate set until the candidate set passing the CRC test is determined as the blind detection result.

From the wireless access point of view, the first thing after the UE is powered on is cell search. The UE firstly performs downlink synchronization and then obtains basic Information of a cell, including MIB (main System Information Block), RMSI (Remaining Minimum System Information), and the like.

The PDCCH is a core of uplink and Downlink resource scheduling of a communication system, and carries Downlink Control Information (DCI) of one or more UEs, including Downlink scheduling allocation Information required for the UEs to receive Downlink shared channel demodulation and decoding, scheduling grant Information for notifying the UEs of resources and transmission formats to be used when the UEs transmit uplink shared channels, acknowledgement Information of shared channel transmission, and Control Information such as transmission power Control commands for uplink channel power Control.

In LTE, the UE needs to acquire MIB, SIB1, and SIB2 of the cell to access the cell. In the 5G NR, the protocol refers to the SIB "mandatory" outside the MIB as RMSI-the Remaining Minimum System Information, which in the 3GPP protocol Release15 is equivalent to SIB 1. Similar to LTE, SIB1 of 5G NR is transmitted through a Physical Downlink Shared Channel (PDSCH), which requires DCI scheduling for a PDCCH. Therefore, the UE should obtain PDCCH information for scheduling RMSI from the MIB, and then, the UE performs blind detection on the PDCCH using the SI-RNTI to obtain RMSI from the PDSCH according to the scheduling information (e.g., DCI1_ 0).

Taking DCI format 1_0 as an example, if the base station is scrambled with C-RNTI and transmitted to "one" specific user, if the base station is RA-RNTI (MSG2), TC-RNTI (MSG4), SI-RNTI (sib), or P-RNTI (paging), it is transmitted to "one group" specific user.

Therefore, the UE needs to use the CSS when parsing common scheduling information such as scheduling SIB1, scheduling OSI, scheduling MSG2, etc., and the CSS may be further divided into Type 0, Type 0A, Type1, Type 2, and Type 3; the UE needs to use the USS when analyzing the uplink and downlink scheduling information of a specific user of the C-RNTI.

In addition, DCI information required for analyzing the scheduling SIB1 needs to acquire CORESET0 and CSS0 time-frequency information, which is carried in a field of an analysis MIB after cell search; obtaining the time-frequency domain information of the SIB1 after obtaining the DCI1_0 (scrambled by SI-RNTI), and then analyzing the SIB1 to obtain the resource information of other CSS/USS. At this point, both the search space type and possibly the CSS/USS resource information are available.

After the determined order of the candidate sets based on the sorting, the DCI size may be determined according to the DCI Format.

In 5G NR, the base station also reduces the possible options for DCI size (size) in order to reduce the complexity of UE processing. The base station determines the Size of some DCI formats, and performs Padding (Padding) or puncturing (puncturing) on other DCI formats with reference to the DCI formats, which is called "DCI Alignment" (DCI Size Alignment). In the DCI format 0-0/0-1/1-0/1-1, frequency domain resource assignment field is a parameter for determining the size of Payload size. In the NR/5G-PDSCH frequency domain location, it is introduced that there are RBs using Coreset #0 for the downlink, and there are also DL initial BWP bandwidths or currently Active BWP bandwidths. For the uplink, the UL initial BWP bandwidth or the currently activated UL Active BWP bandwidth is used.

Taking the simple format DCI format 0-0/1-0 as an example, if DCI format 0-0 is smaller than the length of DCI format 1-0 on Common Search Space, Padding 0 after DCI format 0-0 as Padding makes the length of the Padding identical. If the DCI format 0-0 is longer than the DCI format 1-0, the high order bits of the frequency domain resource assignment are dropped to make the lengths the same. Therefore, for the DCI0_0 and DCI1_0 of the CSS and the USS, the blind detection has only one DCI length, and thus the blind detection possible length is easier to determine.

And sequentially carrying out QAM demodulation, TS 38.211 descrambling, rate de-matching, Polar decoding according to DCI size, RNTI reverse selection, code stream matching CRC check, DCI information analysis and other processes on the ordered candidate set.

Fig. 2 is a schematic flow chart of a blind detection method for a physical downlink control channel in a CSS space according to the present invention. The overall blind detection procedure for the CSS space (including the 3GPP protocol procedure) is shown in fig. 2.

Fig. 3 is a schematic flowchart of a blind detection method for a physical downlink control channel in a USS space according to the present invention. The overall blind detection procedure for the USS space (including the 3GPP protocol procedure) is shown in fig. 3.

This process is in accordance with the TS 38.211/212 protocol, where the TS 38.211 descrambling process may have an impact on the blind detection process. Because, in 5G NR, the DCI information scrambling sequence

Initialization sequence c of_init＝(n_RNTI·2¹⁶+n_ID)mod2³¹The generation may be related to C-RNTI, cell ID, pdcch-DMRS-ScramblingID. Wherein b (i) represents a bit sequence before scrambling, i ∈ { 0.,. M_bit-1}，M_bitRepresents the size of the information bits before scrambling; c (i) represents a Pseudo-random scrambling sequence (generation), i ∈ { 0., M ∈ { 0.,_bit-1}，M_bitindicating the size of the information bits before scrambling.

Wherein, for USS and the high layer is configured with pdcch-DMRS-ScramblingID, n_ID＝pdcch-DMRS-ScramblingID，n_RNTIC-RNTI; otherwise, for those cases where inclusion of CSS or USS is not the case,

n_RNTI＝0，

is a cell ID, obtained by a cell search procedure.

It can be understood that, for each candidate set in the CSS or the USS, any conventional blind detection method for the physical downlink control channel may be used.

According to the embodiment of the invention, the candidate sets under each aggregation level of each search space are respectively sorted according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level, and for each search space, the blind detection of the physical downlink control channel is respectively carried out according to the sequence of each candidate set determined according to the sorting of the search space, so that the blind detection result can be obtained more quickly, and the blind detection efficiency can be improved.

Based on the content of the foregoing embodiments, the specific step of respectively sorting the candidate sets in each aggregation level of each search space according to whether the power of each CCE is occupied by each candidate set in the minimum aggregation level includes: and acquiring a power index value of each CCE according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level.

Specifically, for CSS or USS, the power index value of each CCE in the search space may be initialized to a reference value.

The value of the reference value is not specifically limited in the embodiment of the present invention.

According to the power of each CCE, whether the CCE is occupied by the UE can be judged.

Typically, the power of the CCE occupied by the UE is greater than the power of the CCE not occupied by the UE.

If a CCE is occupied by a UE, a power index value of the CCE may be increased on the basis of a reference value.

If a CCE is occupied by any candidate set at the minimum aggregation level of the search space, the power index value of the CCE may be reduced on the basis of a reference value.

Specifically, for each candidate set under each aggregation level of CSS (or USS), the integrated power index of the candidate set may be obtained according to the power index value of each CCE included in each candidate set.

The order of the candidate sets can be determined by sorting the candidate sets from large to small according to the comprehensive power index of the candidate sets.

According to the embodiment of the invention, the power index value of each CCE is obtained according to the power of each CCE and whether each CCE is occupied by each candidate set under the minimum aggregation level, each candidate set under each aggregation level of each search space is sequenced according to the power index value of each CCE included in the candidate set, and the CCE set actually occupied by the UE can be arranged at a position higher than the position, so that the blind detection result can be obtained by detecting fewer candidate sets with fewer times, the blind detection result can be obtained more quickly, and the blind detection efficiency can be improved.

Based on the content of the foregoing embodiments, the specific step of obtaining the power index value of each CCE according to whether the power of each CCE is occupied by each candidate set at the minimum aggregation level includes: for any CCE, if any CCE is occupied by any candidate set under the minimum aggregation level and the power is smaller than a preset power threshold, determining the power index value of the CCE as 1/alpha; if any CCE power is larger than a power threshold and is occupied by any candidate set under the minimum aggregation level, determining the power index value of the CCE as alpha; if any CCE is not occupied by any candidate set under the minimum aggregation level, determining the power index value of the CCE as 1; wherein α is greater than 1.

Specifically, the power index value of the CCE may be initialized to 1.

For any CCE, whether the CCE is occupied by any candidate set under the minimum aggregation level is judged firstly.

If the result of the determination is negative, the power index value of the CCE is still 1 while keeping the reference value unchanged.

If the result of the determination is yes, whether the CCE is occupied by the UE may be determined according to the power of the CCE.

And judging whether the CCE is occupied by the UE according to the power of the CCE, wherein the judgment can be realized by judging whether the power of the CCE is greater than a preset power threshold value.

If the power of the CCE is greater than a preset power threshold, the CCE can be known to be occupied by the UE; if the power of the CCE is not greater than the preset power threshold, it may be known that the CCE is not occupied by the UE.

For any CCE occupied by any candidate set, if the CCE is occupied by the UE, the power index value of the CCE may be raised from a reference value 1 to a value α greater than 1; if the CCE is not occupied by the UE, the power index value of the CCE may be reduced from the reference value 1 to a value 1/α smaller than 1.

According to the embodiment of the invention, the power index value of each CCE is obtained according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level, so that the candidate sets under each aggregation level in each search space can be ranked based on the power index values of the CCEs included in the candidate sets, and the CCE sets actually occupied by the UE can be ranked at the position closer to the front, so that the blind detection result can be obtained by detecting fewer candidate sets with fewer times, the blind detection result can be obtained more quickly, and the blind detection efficiency can be improved.

Based on the content of the foregoing embodiments, for each candidate set in each aggregation level of each search space, according to the power index value of each CCE included in each candidate set, the specific step of determining the order of each candidate set in each aggregation level of the search space includes: the candidate set including the CCEs having the larger power index value product is ordered before the candidate set including the CCEs having the smaller power index value product.

Specifically, for each candidate set in each aggregation level of CSS (or USS), the candidate sets are first sorted in order of decreasing product of power index values of CCEs included in the candidate set.

According to the embodiment of the invention, the candidate sets under each aggregation level in each search space are sequenced according to the power index values of each CCE (control channel element) included in the candidate sets, and the CCE sets actually occupied by the UE can be arranged at the front positions, so that the blind detection result can be obtained by detecting a smaller number of candidate sets through detection with fewer times, the blind detection result can be obtained more quickly, and the blind detection efficiency can be improved.

Based on the content of the foregoing embodiments, for each candidate set in each aggregation level of each search space, determining, according to the power index value of each CCE included in each candidate set, an order of each candidate set in each aggregation level of the search space further includes: for a plurality of candidate sets having equal products of power index values of the CCEs, the candidate sets having a smaller number of CCEs having power index values of 1/α are ranked before the candidate sets having a larger number of CCEs having power index values of 1/α.

Specifically, after the power index value products of the CCEs included in the candidate set are sorted in descending order, it is necessary to further sort a plurality of candidate sets including the same power index value product of the CCEs included in the candidate set.

The plurality of candidate sets having the same product of power index values of the CCEs included therein may be sorted in descending order of the number of CCEs included in the candidate set having power index values of 1/α.

Based on the content of the foregoing embodiments, for each candidate set in each aggregation level of each search space, according to the power index value of each CCE included in each candidate set, the specific step of determining the order of each candidate set in each aggregation level of the search space further includes: for a plurality of candidate sets having the same number of CCEs having power index values of 1/α, a candidate set having a larger sum of power index values of the CCEs is ranked before a candidate set having a smaller sum of power index values of the CCEs.

Specifically, after the candidate sets are sorted in the order of the number of the power index values 1/α of the CCEs included in the candidate set from small to large, it is necessary to further sort a plurality of candidate sets having the same number of the power index values 1/α of the CCEs included in the candidate set.

The candidate sets having the same number of CCEs having power index values of 1/α may be sorted in descending order of the product of the power index values of the CCEs included in the candidate set.

Based on the content of the foregoing embodiments, for each candidate set in each aggregation level of each search space, according to the power index value of each CCE included in each candidate set, the specific step of determining the order of each candidate set in each aggregation level of the search space further includes: and for a plurality of candidate sets with the equal sum of the power index values of all CCEs, sorting the candidate sets from small to large according to the overall indexes of the candidate sets.

Specifically, after the power index values of the CCEs included in the candidate set are sorted in descending order, it is necessary to further sort a plurality of candidate sets including the same sum of the power index values of the CCEs included in the candidate set.

For a plurality of candidate sets having the same sum of power index values of the CCEs included, the candidate sets may be sorted in the order of the overall index of the candidate set from small to large.

The index of a CCE refers to the position number of the CCE in the CORESET, i.e., the CCE is the second CCE in the CORESET.

The overall index may be obtained according to the index of each CCE included in the candidate set. For example, the overall index may be based on a minimum or average of the indices of the CCEs included in the candidate set.

In order to facilitate understanding of the PDCCH blind detection method provided in the above embodiments of the present invention, the following description is made by way of an example.

Fig. 4 is a schematic flowchart of a blind detection method for a physical downlink control channel according to the present invention; fig. 5 is a schematic diagram of a control resource set involved in a physical downlink control channel blind detection method provided in the present invention.

In the same CORESET, there may be multiplexing of PDCCHs of a plurality of UEs. And at the receiving end, performing blind test check through the polling candidates. As shown in fig. 5, it is assumed that the entire control resource set includes 32 CCEs, the number of UEs is 4, and the size of CORESET is 32 CCEs. Blind detection reception is performed only for UE1, UE2/3/4 acting as an interference term. In this example, it is assumed that the aggregation level used by the PDCCH of UE1 is 4, and the occupied CCEs are {20, 21, 22, 23 }; CCEs occupied by the PDCCH of UE2/3/4 are {4, 5, 6, 7}, {4, 5}, and {16, 17}, respectively.

As shown in fig. 4, the flow of the blind pdcch detection method may include the following steps.

The method comprises the following steps: determining the type of the search space, and acquiring CORESET and CSS/USS time frequency information.

Step two: and determining candidate set positions under different aggregation levels L corresponding to the search space according to the search space type and a candidate set initial position formula.

Step three: and sorting the candidate sets under different aggregation levels according to a sorting algorithm, namely a PDCCH candidate set sorting strategy based on power screening.

(1) The CCE power index value in all CORESET is initialized to 1, i.e., let { CCE0, CCE 1.., CCE31} - {1, 1.·,1 }.

(2) Performing power index value detection on the corresponding CCE with the aggregation level of 1, wherein alpha is 2, and if the CCE is occupied by the candidate set but the power is less than a preset power threshold, the power index value of the CCE is reduced to 1/2; if the CCE is occupied by the candidate set and occupied by the UE (the CCE is detected to be more than the power threshold), the corresponding power index value is increased to 2; if the CCE is not occupied by the candidate set, the corresponding power index value is unchanged; in conclusion, the CCE with value 1 is CCE 0/2/4/6/8/10/12/14/16/18/20/22/24/26/28/30; a CCE of value 1/2 is CCE 1/3/9/11/13/15/19/25/27/29/31; the CCE with value 2 is CCE 5/7/17/21/23.

(3) The power index values E of all candidate sets (i.e., the diagonal-filled consecutive CCEs) in the search space are calculated, and when a candidate contains a plurality of CCEs, the overall weight is accumulated for the power index values of the plurality of CCEs. In summary, E { CCE }, E { C10, C E11}, E { C E14, C E15}, E { CCE }, E { CCE, CCE }, E { CCE }, E2, E { CCE },e { CCE, CCE }, E { CCE, CCE } -, E { CCE, CCE } -, 4, E { C E12, C E13, C E14, C E15} -, E { C E20, C E21, C E22, C E23} -, 4, E { C E28, C E29, C E30, C E31} -, E { CCE, CCE } -, E { CCE, CC E26, C E27, C E28, C E29, C E30, c E31 ═ 1/4.

(4) And sorting all PDCCH candidates according to the index value from high to low. If the index values are different, sorting the index values from high to low; if the index values are the same, for example, E { CCE23} ═ 2 and E { CCE22, CCE23} ═ 2, it is necessary to observe the number m of CCEs with a power index value of 1/2, m of { CCE23} is 0, and m of { CCE22, CCE23} is also 0;

in this case, if the 1/2-valued CCEs are equal in number and both are 0, then the index value sum n of the PDCCH candidates is compared, where n of { CCE23} is 2 and n of { CCE22 and CCE23} is 3, and { CCE22 and CCE23} are prioritized.

In summary, the order of the ordered candidate sets obtained according to the above rules is: { CCE4, CCE5, CCE6, CCE7}, { CCE20, CCE21, CCE22, CCE23},. talks.. talks., { CCE24, CCE25, CCE26, CCE27, CCE28, CCE29, CCE30, CCE31 }. It can be seen that the second CCE set 20, 21, 22, 23 occupied by the ordered UE1, which is outlined by the dashed box in fig. 5, significantly improves the blind detection efficiency.

The following describes the physical downlink control channel blind detection apparatus provided in the embodiment of the present invention, and the physical downlink control channel blind detection apparatus described below and the physical downlink control channel blind detection method described above may be referred to in a corresponding manner.

Fig. 6 is a schematic structural diagram of a physical downlink control channel blind detection apparatus according to an embodiment of the present invention. Based on the content of the above embodiments, as shown in fig. 6, the apparatus includes a candidate determining module 601, an ordering module 602, and a blind detecting module 603, where:

a candidate determining module 601, configured to determine, according to the search space type and a candidate set starting position formula, each candidate set in each search space at each aggregation level;

a sorting module 602, configured to sort, according to the power of each CCE and whether each CCE is occupied by each candidate set at the minimum aggregation level, each candidate set at each aggregation level in each search space;

a blind detection module 603, configured to perform blind detection on the physical downlink control channel based on the order of the candidate sets determined by the sorting.

Specifically, the candidate determination module 601, the ranking module 602, and the blind detection module 603 are electrically connected in sequence.

The candidate determining module 601 may obtain starting positions of candidate sets of different aggregation levels according to a TS 38.213 protocol; according to the starting position of the candidate set of each aggregation level, the candidate sets of the aggregation level can be obtained.

The sorting module 602 may obtain each candidate set at each aggregation level of the public search space according to the starting position of the candidate set of the public search space; according to the initial position of the candidate set of the special search space, each candidate set under each aggregation level of the special search space can be obtained; for each search space, the candidate sets at the aggregation levels of the search space may be sorted according to the power of each CCE and whether the CCE is occupied by the candidate sets at the minimum aggregation level.

The blind detection module 603 may perform blind detection on the physical downlink control channel for each candidate set in sequence according to the order of the candidate sets determined by the sorting until a candidate set passing the CRC check is determined as a result of the blind detection.

The physical downlink control channel blind detection apparatus provided in the embodiments of the present invention is configured to execute the physical downlink control channel blind detection method provided in each of the embodiments of the present invention, and specific methods and processes for implementing corresponding functions by each module included in the physical downlink control channel blind detection apparatus are described in detail in the embodiments of the physical downlink control channel blind detection method, and are not described herein again.

The physical downlink control channel blind detection device is used for the physical downlink control channel blind detection method in each of the foregoing embodiments. Therefore, the description and definition in the blind pdcch detection method in the foregoing embodiments may be used for understanding the execution modules in the embodiments of the present invention.

Fig. 7 illustrates a physical structure diagram of an electronic device, and as shown in fig. 7, the electronic device may include: a processor (processor)701, a memory (memory)702, and a bus 703; the processor 701 and the memory 702 complete communication with each other through the bus 703; the processor 701 is configured to invoke computer program instructions stored in the memory 702 and executable on the processor 701 to perform the method for blind pdcch detection provided by the embodiments of the methods described above, where the method includes: determining each candidate set under each aggregation level of each search space according to the search space type and a candidate set initial position formula; respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level; and carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing.

Furthermore, the logic instructions in the memory 702 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In another aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is capable of executing the method for blind detection of a physical downlink control channel provided in the foregoing method embodiments, where the method includes: determining each candidate set under each aggregation level of each search space according to the search space type and a candidate set initial position formula; respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level; and carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing.

In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented by a processor to perform the method for blind detection of a physical downlink control channel provided in the foregoing embodiments, where the method includes: determining each candidate set under each aggregation level of each search space according to the search space type and a candidate set initial position formula; respectively sequencing the candidate sets under each aggregation level of each search space according to the power of each CCE and whether the CCE is occupied by each candidate set under the minimum aggregation level; and carrying out blind detection on the physical downlink control channel based on the sequence of each candidate set determined by the sequencing.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A blind detection method for a Physical Downlink Control Channel (PDCCH) is characterized by comprising the following steps:

2. The method according to claim 1, wherein the step of sorting the candidate sets in each aggregation level of each search space according to the power of each CCE and whether each CCE is occupied by each candidate set in a minimum aggregation level comprises:

3. The method according to claim 2, wherein the specific step of obtaining the power index value of each CCE according to whether the power sum of each CCE is occupied by each candidate set at the minimum aggregation level comprises:

wherein α is greater than 1.

4. The method of claim 3, wherein the step of determining the order of the candidate sets in each aggregation level of the search space according to the power index value of each CCE included in each candidate set for each candidate set in each aggregation level of the search space comprises:

5. The method of claim 4, wherein the determining, for each candidate set in each aggregation level of the search space, an order of the candidate sets in each aggregation level of the search space according to a power indicator value of each CCE included in each candidate set further comprises:

6. The method of claim 5, wherein the step of determining the order of the candidate sets in each aggregation level of the search space according to the power index value of each CCE included in each candidate set for each candidate set in each aggregation level of the search space further comprises:

7. The method of claim 6, wherein the step of determining the order of the candidate sets in each aggregation level of the search space according to the power index value of each CCE included in each candidate set for each candidate set in each aggregation level of the search space further comprises:

8. A physical downlink control channel blind detection device, comprising:

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the physical downlink control channel blind detection method according to any one of claims 1 to 7.

10. A non-transitory computer readable storage medium, having stored thereon a computer program, which, when being executed by a processor, performs the steps of the method for blind pdcch detection according to any of claims 1 to 7.