CN116886239A - Blind detection method and user equipment for 5G wireless communication system - Google Patents

Blind detection method and user equipment for 5G wireless communication system Download PDF

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Publication number
CN116886239A
CN116886239A CN202310668478.0A CN202310668478A CN116886239A CN 116886239 A CN116886239 A CN 116886239A CN 202310668478 A CN202310668478 A CN 202310668478A CN 116886239 A CN116886239 A CN 116886239A
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China
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pdcch
candidate
blind detection
soft bit
bit information
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CN202310668478.0A
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Chinese (zh)
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戴曼
赵赫
赵旭莹
石晶林
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Institute of Computing Technology of CAS
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Institute of Computing Technology of CAS
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Priority to CN202310668478.0A priority Critical patent/CN116886239A/en
Publication of CN116886239A publication Critical patent/CN116886239A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application provides a blind detection method and user equipment for a 5G wireless communication system, wherein the method comprises the following steps: s1, acquiring configuration information of a control resource set and configuration information of a corresponding search space, and determining a candidate PDCCH set formed by a plurality of candidate PDCCHs according to the configuration information of the control resource set and the configuration information of the corresponding search space, wherein each candidate PDCCH comprises at least one control channel element; s2, carrying out concentrated symbol level processing on the control resource set according to configuration information of the control resource set so as to extract soft bit information of subcarrier positions related to the candidate PDCCH set at one time and form a soft bit information base required by current blind detection; s3, selecting the PDCCH candidates from the PDCCH candidate set by utilizing a preset selection rule, wherein in blind detection, soft bit information of subcarrier positions corresponding to the frequency domain resource blocks is acquired from the soft bit information base according to the frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidates, and blind detection is executed.

Description

Blind detection method and user equipment for 5G wireless communication system
Technical Field
The present application relates to the field of communications, and more particularly, to a blind detection method and user equipment for a 5G communication system.
Background
In a 5G NR (New Radio) system, a physical downlink control channel (Physical Downlink Control Channel, abbreviated PDCCH) is used to carry downlink control information (Downlink Control Information, abbreviated DCI), which may indicate uplink and downlink scheduling information and other control information.
In 5G, the set of time-frequency resources that can be used by the PDCCH is called a control resource set (Control Resource Set, abbreviated as CORESET), and a control channel element (Control Channel Element, abbreviated as CCE) is used as a basic resource unit in CORESET. One PDCCH may be aggregated from several CCEs, and the number of CCEs aggregated into the PDCCH is the aggregation level (Aggregation Level, AL) of the PDCCH. The aggregation level supported in the 5G NR includes 1, 2, 4, 8, and 16, and in downlink communications, the base station may dynamically configure the size of the aggregation level, and the higher the aggregation level, the more time-frequency resources that can be used, and the higher the probability that DCI can be correctly received.
On the ue side, after receiving the downlink data, the downlink data may include downlink control information and service data of multiple different users. After determining the position of the control resource set in the downlink data, the user still does not know the aggregation level used by the PDCCH of the user and the specific position in the control resource set, so that the user equipment needs to search (i.e. detect) the control information belonging to the user equipment in the whole control resource set.
However, referring to fig. 1, the existing PDCCH blind detection scheme includes:
a1, calculating candidate PDCCHs of all candidate aggregation levels according to the configuration of CORESET and Search Space;
a2, judging whether the traversal of all candidate aggregation levels is completed, if yes, turning to the step A11, and if not, turning to the step A3;
a3, selecting a candidate aggregation level which is not traversed;
a4, judging whether unprocessed candidate PDCCHs exist under the candidate aggregation level, if so, turning to the step A5, and if not, turning to the step A;
a5, selecting an unprocessed candidate PDCCH from the candidate aggregation level;
a6, determining indexes of frequency domain resource blocks occupied by the selected candidate PDCCH;
a7, determining soft bit information at the subcarrier position corresponding to the index of the frequency domain resource block occupied by the candidate PDCCH through channel estimation, interpolation, channel equalization and soft demodulation;
a8, decoding according to the related soft bit information;
a9, judging whether the decoding is successful; judging whether the decoding is successful or not through CRC operation;
a10, the blind test is successful, and downlink control information is obtained; in order to avoid unnecessary calculation, after the downlink control information is obtained, even if the unprocessed candidate PDCCH still exists in the follow-up sequence, blind detection of the unprocessed candidate PDCCH is not continued;
a11, the blind test fails.
The number of subcarriers and the combination of subcarrier positions related to the PDCCH candidates are different under different aggregation levels, but some subcarrier positions are overlapped. According to steps A6 and A7 shown in fig. 1, repeated channel estimation, channel equalization and soft demodulation are performed on some subcarrier positions under different candidate aggregation levels, so that a large number of repeated calculations are caused, and a large time delay is caused to the whole 5G communication system.
Disclosure of Invention
It is therefore an object of the present application to overcome the above-mentioned drawbacks of the prior art and to provide a blind detection method and a user equipment for a 5G wireless communication system.
The application aims at realizing the following technical scheme:
according to a first aspect of the present application, there is provided a blind detection method for a 5G wireless communication system, comprising the steps of: s1, acquiring configuration information of a control resource set and configuration information of a corresponding search space, and determining a candidate PDCCH set formed by a plurality of candidate PDCCHs according to the configuration information of the control resource set and the configuration information of the corresponding search space, wherein each candidate PDCCH comprises at least one control channel element; s2, carrying out concentrated symbol level processing on the control resource set according to configuration information of the control resource set so as to extract soft bit information of subcarrier positions related to the candidate PDCCH set at one time and form a soft bit information base required by current blind detection; s3, selecting the PDCCH candidates from the PDCCH candidate set by utilizing a preset selection rule, wherein in blind detection, soft bit information of subcarrier positions corresponding to the frequency domain resource blocks is acquired from the soft bit information base according to the frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidates, and blind detection is executed.
Optionally, the step S2 includes: generating a local PDCCH-DMRS signal according to the configuration information of the control resource set and the 3GPP protocol; extracting received PDCCH-DMRS signals belonging to the control resource set according to the received frequency domain signals; performing channel estimation according to the received PDCCH-DMRS signal and the local PDCCH-DMRS signal to obtain a first channel estimation result; performing linear interpolation operation according to the first channel estimation result to determine a second channel estimation result of the subcarrier position related to the candidate PDCCH set; and carrying out channel equalization and soft demodulation according to a second channel estimation result of the subcarrier position related to the candidate PDCCH set to obtain soft bit information of the related subcarrier position.
Optionally, the step S2 further includes: and establishing an association relation between indexes of the frequency domain resource blocks and soft bit information of the corresponding subcarrier positions by taking the frequency domain resource blocks as units, and generating the soft bit information base.
Optionally, the step S1 includes: the set of PDCCH candidates includes a subset of PDCCH candidates for each of a plurality of aggregation candidate levels.
Optionally, the step S3 includes: according to the control channel elements contained in each PDCCH candidate, determining indexes of all frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidate, and sequencing according to the sequence agreed by the 3GPP protocol to obtain an index table of the frequency domain resource blocks corresponding to each PDCCH candidate; and selecting the candidate PDCCHs of the candidate PDCCH subset in sequence for blind detection until the blind detection is successful or the blind detection fails, wherein when the blind detection is performed on the corresponding candidate PDCCH, the corresponding soft bit information is acquired from the soft bit information base according to the index table of the frequency domain resource block corresponding to the candidate PDCCH and the mapping relation so as to establish a soft bit information sequence corresponding to the candidate PDCCH.
Optionally, the step S3 further includes: descrambling and decoding the soft bit information sequence corresponding to the candidate PDCCH to obtain a decoding result; performing CRC (cyclic redundancy check) on the decoding result, if the decoding result is correct, performing blind detection successfully, and taking the decoding result as downlink control information obtained by blind detection; otherwise, selecting the next candidate PDCCH to carry out blind detection until all the candidate PDCCHs of all the candidate aggregation levels finish the blind detection.
Optionally, in the index table of the frequency domain resource block corresponding to each PDCCH candidate, indexes of the frequency domain resource blocks are arranged in order from small to large.
According to a second aspect of the present application there is provided a user equipment comprising means for performing the method of the first aspect.
According to a third aspect of the present application, there is provided an electronic device comprising: one or more processors; and a memory, wherein the memory is for storing executable instructions; the one or more processors are configured to implement the steps of the method of the first aspect via execution of the executable instructions.
Compared with the prior art, the application has the advantages that:
the embodiment of the application carries out symbol-level processing on the control resource set to intensively extract soft bit information of subcarrier positions possibly occupied by data of each candidate PDCCH so as to form a soft bit information base required by current blind detection; in the subsequent blind detection, according to the frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidates, soft bit information of subcarrier positions corresponding to the frequency domain resource blocks is directly obtained from the soft bit information base to execute the blind detection; therefore, for the same subcarrier position, only one operation of extracting soft bit information of the subcarrier position is needed, repeated calculation amount is reduced, the efficiency of 5G NR blind detection is improved, the data transmission efficiency in the 5G communication process is improved, and communication time delay is reduced.
Drawings
Embodiments of the application are further described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow diagram of a prior art blind detection scheme;
fig. 2 is a flow chart of a blind detection method for a 5G wireless communication system according to an embodiment of the present application;
fig. 3 is a schematic diagram of indexes of frequency domain resource blocks within an exemplary control resource set according to an embodiment of the present application;
fig. 4 is a schematic diagram of an index table of frequency domain resource blocks of one exemplary PDCCH candidate according to an embodiment of the present application.
Detailed Description
For the purpose of making the technical solutions and advantages of the present application more apparent, the present application will be further described in detail by way of specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
As mentioned in the background section, the repetition of channel estimation, channel equalization, soft demodulation according to certain subcarrier locations, involved in different candidate aggregation levels, results in a large number of repeated calculations, which will introduce a large delay to the overall 5G communication system. In this regard, the embodiment of the present application performs symbol-level processing on the control resource set to intensively extract soft bit information of subcarrier positions possibly occupied by data of each candidate PDCCH, so as to form a soft bit information base required for current blind detection; in the subsequent blind detection, according to the frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidates, soft bit information of subcarrier positions corresponding to the frequency domain resource blocks is directly obtained from the soft bit information base to execute the blind detection; therefore, for the same subcarrier position, only one operation of extracting soft bit information of the subcarrier position is needed, repeated calculation amount is reduced, the efficiency of 5G NR blind detection is improved, the data transmission efficiency in the 5G communication process is improved, and communication time delay is reduced.
For ease of understanding, an exemplary 5G wireless communication system according to an embodiment of the present application will be described. A 5G wireless communication system includes a base station and at least one User Equipment (UE). The base station may be a gNB of a 5G radio system, or may be an evolved node b (eNB) capable of supporting a 5G communication protocol in an LTE system. When a user equipment needs to access network services through a base station, it may be necessary to receive control signals from the base station to obtain system information such as synchronization, radio resource allocation, and scheduling, which are located in the coverage area. For example, the user equipment may need to detect PDCCH candidates in a signal transmitted by the base station to determine Downlink Control Information (DCI), i.e., blind detection. The blind detection method according to the embodiment of the present application will be described later.
According to an embodiment of the present application, referring to fig. 2, there is provided a blind detection method for a 5G wireless communication system, including the steps of: s1, S2 and S3. For a better understanding of the present application, each step is described in detail below in connection with specific examples.
Step S1: and acquiring configuration information of a control resource set and configuration information of a corresponding search space, and determining a candidate PDCCH set formed by a plurality of candidate PDCCHs according to the configuration information of the control resource set and the configuration information of the corresponding search space, wherein each candidate PDCCH comprises at least one control channel element.
According to one embodiment of the application, the base station configures one or more sets of control resources (CORESET) including resource candidates for PDCCH transmission. CORESET may be defined as a set of radio resources and the search space of the user equipment may be located in the set of radio resources. The CORESET of the user device may be specific to the user device and may vary from one user device to another. From the perspective of the ue, it may receive configuration information of one or more CORESETs, and search its PDCCH in one or more CORESETs according to the configuration information of its search space, and for each possible PDCCH that needs to be searched, it is a candidate PDCCH. In this step, for each of a plurality of candidate aggregation levels, all the candidate PDCCHs under the candidate aggregation level are determined to form a subset of the candidate PDCCHs of the candidate aggregation level.
According to one embodiment of the application, step S1 comprises: s11, determining the number S of time domain symbols occupied by the control resource set and the number N of frequency domain Resource Blocks (RBs) occupied by the control resource set according to configuration information (or CORESET configuration) of the control resource set; s12, determining a candidate PDCCH subset of each candidate aggregation level in a plurality of candidate aggregation levels according to the number S of time domain symbols occupied by the control resource set, the number N of frequency domain Resource Blocks (RBs) occupied by the control resource set and configuration information of a search space associated with the control resource set. The subset of PDCCH Candidates for each candidate aggregation level includes the number of PDCCH candidates_num for that candidate aggregation level and CCE indexes for each PDCCH candidate, each CCE index including an index of an associated at least one frequency domain resource block. As shown in fig. 2, assuming that the number of symbols s=2 of one control resource set, the number of frequency domain Resource Blocks (RBs) occupied by the control resource set n=270; the index of the frequency domain resource block of the corresponding control resource set is shown in fig. 3; for the case that the candidate aggregation level is 4, a certain candidate PDCCH includes 4 Control Channel Elements (CCEs), which are assumed to be CCE0, CCE1, CCE2, and CCE3, respectively, and for convenience of observation, frequency domain resource blocks corresponding to each control channel element are distinguished by color or background patterns.
Step S2: and carrying out symbol-level processing on the control resource set according to the configuration information of the control resource set, and extracting soft bit information of the subcarrier position related to the candidate PDCCH set in a one-time mode to form a soft bit information base required by current blind detection.
According to one embodiment of the application, step S2 comprises: generating a local PDCCH-DMRS signal according to the configuration information of the control resource set and the 3GPP protocol; extracting received PDCCH-DMRS signals belonging to the control resource set according to the received frequency domain signals; performing channel estimation according to the received PDCCH-DMRS signal and the local PDCCH-DMRS signal to obtain a first channel estimation result; performing linear interpolation operation according to the first channel estimation result to determine a second channel estimation result of the subcarrier position related to the candidate PDCCH set; performing channel equalization and soft demodulation according to a second channel estimation result of the subcarrier positions related to the candidate PDCCH set to obtain soft bit information of the related subcarrier positions; and establishing an association relation between indexes of the frequency domain resource blocks and soft bit information of the corresponding subcarrier positions by taking the frequency domain resource blocks as units, and generating the soft bit information base.
According to one embodiment of the application, step S2 comprises: s21, according to configuration information of CORESET, generating a local PDCCH-DMRS signal by the user equipment according to a 3GPP protocol; s22, extracting PDCCH-DMRS subcarriers in CORESET by the user equipment according to the received frequency domain signals, and carrying out channel estimation with the local PDCCH-DMRS signals to obtain a channel estimation result H_DMRS (corresponding to a first channel estimation result) at the PDCCH-DMRS subcarriers; s23, performing linear interpolation operation according to the channel estimation result H_DMRS to obtain a channel estimation result H_DATA (corresponding to a second channel estimation result) of the position of the subcarrier occupied by the PDCCH DATA in the CORESET; s24, carrying out channel equalization and soft demodulation according to the channel estimation result H_DATA to obtain soft bit information of relevant subcarrier positions in the whole CORESET; s25, establishing an association relation between indexes of the frequency domain resource blocks and soft bit information of the corresponding subcarrier positions, and generating the soft bit information base. Referring again to fig. 3, for example, after the soft bit information (not shown in fig. 3) of the RB0 related subcarrier position in fig. 3 is obtained, an association (mapping) is established between the soft bit information of the RB0 and the RB0 related subcarrier position, and indexes of the remaining frequency domain resource blocks are similar to the establishment of the association of the soft bit information of the corresponding subcarrier positions, so that after the establishment of the association is completed, a soft bit information base can be obtained. The technical scheme of the embodiment at least can realize the following beneficial technical effects: in the prior art, when a certain candidate PDCCH is blindly detected, the corresponding subcarrier position is independently determined, and then the steps of channel estimation, channel equalization and soft demodulation are carried out to obtain soft bit information of the subcarrier position for the subsequent blind detection step; because some subcarrier positions among the candidate PDCCHs of different candidate aggregation levels are repeated, the mode in the prior art can lead to more repeated operation processes, the embodiment of the application firstly determines the candidate PDCCH set, extracts the soft bit information of the subcarrier positions related to the candidate PDCCH set at one time to form a soft bit information base required by the current blind detection, and only needs to retrieve and acquire the soft bit information of the corresponding subcarrier positions from the soft bit information base when the soft bit information of the corresponding subcarrier positions is required subsequently, thereby avoiding repeated extraction of the soft bit information of the same subcarrier position and improving the blind detection efficiency.
Step S3: and selecting the PDCCH candidates from the PDCCH candidate set by using a preset selection rule, wherein in blind detection, soft bit information of subcarrier positions corresponding to the frequency domain resource blocks is acquired from the soft bit information base according to the frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidates, so as to execute blind detection.
According to one embodiment of the application, step S3 comprises: according to the control channel elements contained in each candidate PDCCH, determining indexes of all frequency domain resource blocks corresponding to the control channel elements contained in the candidate PDCCH and sequencing according to the sequence agreed by the 3GPP protocol to obtain an index table of the frequency domain resource blocks corresponding to each candidate PDCCH (in the index table of the frequency domain resource blocks corresponding to each candidate PDCCH, the indexes of the frequency domain resource blocks are arranged in the sequence from small to large in blind detection, and the index table of the frequency domain resource blocks of the candidate PDCCH consisting of CCE0-CCE3 shown in the schematic diagram in the figure 3 is shown in the figure 4); selecting the candidate PDCCH of the candidate PDCCH subset in sequence for blind detection until the blind detection is successful or the blind detection fails, wherein when the blind detection is performed on the corresponding candidate PDCCH, according to an index table of a frequency domain resource block corresponding to the candidate PDCCH and the mapping relation, acquiring corresponding soft bit information from the soft bit information base to establish a soft bit information sequence corresponding to the candidate PDCCH, and descrambling and decoding the soft bit information sequence corresponding to the candidate PDCCH to obtain a decoding result; performing CRC (cyclic redundancy check) on the decoding result, if the decoding result is correct, performing blind detection successfully, and taking the decoding result as downlink control information obtained by blind detection; otherwise, selecting the next candidate PDCCH for blind detection. And continuously selecting the next candidate PDCCH to perform blind detection until the blind detection is successful or all the candidate PDCCHs of all the candidate aggregation levels complete the blind detection. And if all the candidate PDCCHs of all the candidate aggregation levels complete blind detection, and none of the candidate PDCCHs is successful in blind detection, the blind detection is considered as failure.
According to an embodiment of the present application, there is provided a communication apparatus including means for performing the blind detection method for the 5G wireless communication system of the previous embodiment.
According to an embodiment of the present application, there is provided an electronic apparatus including: one or more processors; and a memory, wherein the memory is for storing executable instructions; the one or more processors are configured to implement, via execution of the executable instructions, the steps of the blind detection method for a 5G wireless communication system of the foregoing embodiments.
It should be noted that, although the steps are described above in a specific order, it is not meant to necessarily be performed in the specific order, and in fact, some of the steps may be performed concurrently or even in a changed order, as long as the required functions are achieved.
The present application may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present application.
The computer readable storage medium may be a tangible device that retains and stores instructions for use by an instruction execution device. The computer readable storage medium may include, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. A blind detection method for a 5G wireless communication system, comprising the steps of:
s1, acquiring configuration information of a control resource set and configuration information of a corresponding search space, and determining a candidate PDCCH set formed by a plurality of candidate PDCCHs according to the configuration information of the control resource set and the configuration information of the corresponding search space, wherein each candidate PDCCH comprises at least one control channel element;
s2, carrying out concentrated symbol level processing on the control resource set according to configuration information of the control resource set so as to extract soft bit information of subcarrier positions related to the candidate PDCCH set at one time and form a soft bit information base required by current blind detection;
s3, selecting the PDCCH candidates from the PDCCH candidate set by utilizing a preset selection rule, wherein in blind detection, soft bit information of subcarrier positions corresponding to the frequency domain resource blocks is acquired from the soft bit information base according to the frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidates, and blind detection is executed.
2. The method according to claim 1, wherein the step S2 comprises:
generating a local PDCCH-DMRS signal according to the configuration information of the control resource set and the 3GPP protocol;
extracting received PDCCH-DMRS signals belonging to the control resource set according to the received frequency domain signals;
performing channel estimation according to the received PDCCH-DMRS signal and the local PDCCH-DMRS signal to obtain a first channel estimation result;
performing linear interpolation operation according to the first channel estimation result to determine a second channel estimation result of the subcarrier position related to the candidate PDCCH set;
and carrying out channel equalization and soft demodulation according to a second channel estimation result of the subcarrier position related to the candidate PDCCH set to obtain soft bit information of the related subcarrier position.
3. The method according to claim 2, wherein the step S2 further comprises:
and establishing an association relation between indexes of the frequency domain resource blocks and soft bit information of the corresponding subcarrier positions by taking the frequency domain resource blocks as units, and generating the soft bit information base.
4. A method according to claim 3, wherein said step S1 comprises:
the set of PDCCH candidates includes a subset of PDCCH candidates for each of a plurality of aggregation candidate levels.
5. The method according to claim 4, wherein the step S3 includes:
according to the control channel elements contained in each PDCCH candidate, determining indexes of all frequency domain resource blocks corresponding to the control channel elements contained in the PDCCH candidate, and sequencing according to the sequence agreed by the 3GPP protocol to obtain an index table of the frequency domain resource blocks corresponding to each PDCCH candidate;
and selecting the candidate PDCCHs of the candidate PDCCH subset in sequence for blind detection until the blind detection is successful or the blind detection fails, wherein when the blind detection is performed on the corresponding candidate PDCCH, the corresponding soft bit information is acquired from the soft bit information base according to the index table of the frequency domain resource block corresponding to the candidate PDCCH and the mapping relation so as to establish a soft bit information sequence corresponding to the candidate PDCCH.
6. The method according to claim 5, wherein the step S3 further comprises:
descrambling and decoding the soft bit information sequence corresponding to the candidate PDCCH to obtain a decoding result;
performing CRC (cyclic redundancy check) on the decoding result, if the decoding result is correct, performing blind detection successfully, and taking the decoding result as downlink control information obtained by blind detection; otherwise, selecting the next candidate PDCCH to carry out blind detection until all the candidate PDCCHs of all the candidate aggregation levels finish the blind detection.
7. The method of claim 5 wherein indexes of the frequency domain resource blocks are arranged in order from small to large in the index table of the frequency domain resource block corresponding to each PDCCH candidate.
8. A user equipment, characterized in that it comprises means for performing the method according to any of claims 1-7.
9. A computer readable storage medium, having stored thereon a computer program executable by a processor to implement the steps of the method of any one of claims 1 to 7.
10. An electronic device, comprising:
one or more processors; and
a memory, wherein the memory is for storing executable instructions;
the one or more processors are configured to implement the steps of the method of any one of claims 1 to 7 via execution of the executable instructions.
CN202310668478.0A 2023-06-07 2023-06-07 Blind detection method and user equipment for 5G wireless communication system Pending CN116886239A (en)

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