CN114598439B - PDCCH blind detection method, terminal and storage medium for 5G communication system - Google Patents

PDCCH blind detection method, terminal and storage medium for 5G communication system Download PDF

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CN114598439B
CN114598439B CN202210497098.0A CN202210497098A CN114598439B CN 114598439 B CN114598439 B CN 114598439B CN 202210497098 A CN202210497098 A CN 202210497098A CN 114598439 B CN114598439 B CN 114598439B
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CN114598439A (en
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邓勇志
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Guangdong Shiju Network Technology Co ltd
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Guangzhou Shiju Network Technology Co Ltd
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    • 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
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • 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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Abstract

The invention discloses a PDCCH blind detection method, a terminal and a storage medium for a 5G communication system, which comprise the following steps: sequentially judging whether the alternative CCE contained in the search space meets power judgment conditions; when the power judgment condition is met, the candidate CCEs are used as the candidate CCEs, and power judgment is carried out on all the candidate CCEs in the search space to obtain a candidate CCE set; and determining a candidate PDCCH set according to the candidate CCE set, and performing validity detection on the candidate PDCCH in the candidate PDCCH set, wherein the validity detection comprises decoding the candidate PDCCH, performing reverse coding on a decoding result to obtain a local coding result, and judging that the candidate PDCCH is valid when the similarity between the local coding result and a received coding result meets a similarity threshold value. Compared with the prior art, the blind detection processing complexity of the terminal is greatly reduced, and the blind detection efficiency is improved.

Description

PDCCH blind detection method, terminal and storage medium for 5G communication system
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a PDCCH blind detection method, a terminal, and a storage medium for a 5G communication system.
Background
The dynamic scheduling of each physical channel in the 5G wireless communication system protocol is indicated by Downlink Control Information (DCI), and for a terminal UE, the UE blindly detects its own PDCCH in a search space according to the configuration of a base station, resolves DCI Information carried by the PDCCH, and performs subsequent data reception or transmission.
The physical control channel is responsible for the transfer of various key control information of the physical layer, and is the key to the operation of a New Radio (NR) interface of 5G. Wherein, a Physical Downlink Control Channel (PDCCH) carries Downlink Control Information (DCI) sent by the 5G base station gNB to the terminal UE. These pieces of information include: scheduling a control format of uplink/downlink data transmission; controlling uplink power; dynamic time slot allocation; resource preemption indications, and the like. After detecting the control information, the terminal UE performs corresponding operations such as data reception or transmission, and related configuration adjustment according to the control information.
The basic Resource concept of the PDCCH includes a Resource Element Group (REG), a Control Channel Element (CCE), a Control Resource Set (CORESET), a Search Space (SS), and the like. An REG is a physical Resource unit that occupies one OFDM symbol in a time domain and occupies one Resource Block (RB) in a frequency domain, and includes 12 Resource Elements (REs), where 3 REs are used for carrying a demodulation reference signal DMRS and 9 REs are used for carrying DCI information. The CCE is a basic unit constituting the PDCCH, and one CCE includes 6 REGs. A given PDCCH may consist of 1, 2, 4, 8 or 16 CCEs, and the number of CCEs constituting the PDCCH is called Aggregation Level (AL), and its specific value is determined by DCI payload size and required coding rate. The base station gNB may adjust the aggregation level of the PDCCH according to the actual transmitted radio channel state, thereby implementing link adaptive transmission. The CORESET occupies 1-3 OFDM signals in a time domain, occupies a plurality of RB physical resource sets in a frequency domain, and can contain a plurality of PDCCHs. The search space is configured with a set of candidate PDCCHs under a certain aggregation level, and each search space is associated with a CORESET. The candidate PDCCHs occupy a series of CCEs in the CORESET, the number of the CCEs is determined by the aggregation level of the candidate PDCCHs, and the initial position of the CCE set in the CORESET is jointly determined by parameters such as a search space type (public/UE private), a Radio Network Temporary Identifier (RNTI) of the terminal UE, a carrier cell indication and the like.
When detecting a PDCCH candidate, the UE faces various uncertain factors including: possible search space types, radio network temporary identity, RNTI, associated with PDCCH, possible carrier cell indications and possible aggregation levels. This results in a plurality of possible combinations of candidate PDCCHs at the start position and length of the CCE set. The UE needs to perform blind detection on the above multiple possibilities. And the UE decodes all the candidate PDCCHs in the search space, if the CRC passes, the decoded PDCCH content is considered to be effective to the UE, and the UE performs subsequent operation according to the DCI obtained by decoding. And if the CRC fails, the received PDCCH is considered to be irrelevant to the UE, and subsequent processing is not carried out.
However, in a specific scenario, for a certain type of detecting device or instrument device (hereinafter referred to as a terminal), it is expected that PDCCH bearer information can be acquired without undergoing a complete network access process as a conventional UE. The detection equipment does not obtain the allocation of the C-RNTI when detecting the PDCCH, the C-RNTI influences the CCE set position of a private search space and the CRC check after decoding, the PDCCH blind detection is carried out under the condition that the C-RNTI is undefined, the detection difficulty and complexity are greatly improved, and the blind detection efficiency is reduced.
Therefore, an improved PDCCH blind detection method is urgently needed to solve the above technical problems.
Disclosure of Invention
In view of the above, it is desirable to provide a PDCCH blind detection method, a terminal and a storage medium for a 5G communication system, so as to reduce the processing complexity of PDCCH blind detection and improve the detection efficiency.
In order to achieve the above object, an embodiment of the present invention provides a PDCCH blind detection method for a 5G communication system, including the following steps:
sequentially judging whether the alternative CCE contained in the search space meets power judgment conditions;
when the alternative CCE meets the power judgment condition, taking the alternative CCE as a candidate CCE, and performing power judgment on all the alternative CCEs in the search space to obtain a candidate CCE set comprising all the candidate CCEs;
and determining a candidate PDCCH set according to the candidate CCE set, and performing validity detection on the candidate PDCCH in the candidate PDCCH set to detect the valid PDCCH, wherein the validity detection comprises decoding the candidate PDCCH and performing reverse coding on a decoding result to obtain a local coding result, and when the similarity between the local coding result and a received coding result meets a similarity threshold value, the candidate PDCCH is judged to be the valid PDCCH.
Optionally, the specifically step of sequentially determining whether the candidate CCEs included in the search space satisfy the power decision condition is:
and sequentially judging whether the average power of the alternative CCEs contained in the search space meets the power judgment condition or not.
Optionally, the power decision condition includes a power decision range, and when the power of the candidate CCE is within the power decision range, the candidate CCE satisfies the power decision condition; before the step of sequentially judging whether the candidate CCEs contained in the search space satisfy the power decision condition, the method further comprises:
acquiring reference receiving power and power allowable deviation degree of a terminal;
and determining the power decision range of the terminal according to the reference received power and the power allowable deviation degree.
Optionally, the step of obtaining the reference received power of the terminal includes:
detecting a PDCCH scrambled by a fixed common RNTI;
and calculating the received power of the detected PDCCH scrambled by the fixed public RNTI, and taking the received power as the reference received power of the terminal, wherein the received power is REG average power or CCE average power.
Optionally, before the step of sequentially determining whether the candidate CCEs included in the search space satisfy the power decision condition, the method further includes:
acquiring a CCE of the detected PDCCH scrambled by the fixed public RNTI as a target CCE;
and if the target CCE exists in all CCE sets contained in the search space, deleting the target CCE from all CCE sets to obtain an alternative CCE set.
Optionally, the determining a candidate PDCCH set according to the candidate CCE set, and the detecting validity of the candidate PDCCHs in the candidate PDCCH set includes:
and selecting candidate CCEs of corresponding aggregation levels from the candidate CCE set in sequence according to a preset sequence of the aggregation levels, combining the candidate CCEs into a candidate PDCCH, and carrying out validity detection on the candidate PDCCH corresponding to the aggregation level, wherein the candidate PDCCHs corresponding to all the aggregation levels form the candidate PDCCH set.
Optionally, the step of performing validity detection on the PDCCH candidate includes:
demodulating, descrambling and rate de-matching the candidate PDCCH to obtain a bit stream d, wherein the bit stream d is a receiving and coding result;
polar decoding is carried out on the bit stream d to obtain decoding soft bits, and the decoding soft bits are judged to obtain decoding DCI bit stream;
carrying out forward Polar coding on the DCI bit stream obtained by decoding to obtain a bit stream d ', wherein the bit stream d' is a local coding result;
and judging whether the similarity of the bit stream d and the bit stream d' meets a similarity threshold, and judging the candidate PDCCH as an effective PDCCH when the judgment result is yes.
Optionally, the step of detecting the validity of the PDCCH candidates of any aggregation level further includes:
and when the candidate PDCCH is an effective PDCCH, acquiring the RNTI corresponding to the effective PDCCH from the decoding result of the effective PDCCH, and deleting the candidate CCE corresponding to the effective PDCCH from the candidate CCE set.
Another embodiment of the present invention provides a terminal, including a memory and a processor, where the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to implement the steps of the PDCCH blind detection method for a 5G communication system as described above.
Yet another embodiment of the present invention provides a computer readable storage medium having stored therein at least one instruction, which is loaded and executed by a processor to implement the steps of the PDCCH blind detection method for a 5G communication system as shown above.
Compared with the prior art, the PDCCH blind detection method for the 5G communication system provided by the embodiment of the invention firstly judges whether the alternative CCE contained in the search space meets the power judgment condition, when the alternative CCE meets the power judgment condition, the alternative CCE is taken as the candidate CCE, then the candidate PDCCH set is determined according to the candidate CCE set, then the candidate PDCCH is decoded and the decoding result is reversely coded to obtain the local coding result, when the similarity between the local coding result and the receiving coding result meets the similarity threshold, the candidate PDCCH is judged to be the effective PDCCH, then the RNTI corresponding to the effective PDCCH can be obtained, the alternative CCE is screened through the power judgment condition, the ineffective CCE can be filtered out, so that the data volume of the candidate PDCCH is reduced, meanwhile, the candidate PDCCH is decoded and then reversely coded, and the local coding result is compared with the receiving coding result, the effectiveness of the candidate PDCCH can be determined and the associated RNTI can be detected, so that the blind detection processing complexity of the terminal is greatly reduced, and the blind detection efficiency is improved.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of a PDCCH blind detection method for a 5G communication system according to an embodiment of the present invention.
Fig. 2 is a specific flowchart for determining candidate CCE sets in the PDCCH blind detection method for a 5G communication system according to the present invention.
Fig. 3 is a specific implementation flow of blind PDCCH detection candidates based on the determined CCE candidate set in the PDCCH blind detection method for a 5G communication system according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The invention is used for PDCCH blind detection method of 5G communication system, utilize the energy difference of PDCCH resource in the time-frequency domain to select the valid signal, decode the valid signal, and compare with signal received through the reverse code after decoding, thus confirm the validity of the candidate PDCCH and detect the associated C-RNTI, the invention can detect and obtain PDCCH bearing information under the situation that C-RNTI associated with PDCCH is unknown, compared with conventional forward detection method and has higher efficiency. Based on this, the present invention provides a PDCCH blind detection method, a terminal and a storage medium for a 5G communication system as shown in the following embodiments.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a PDCCH blind detection method for a 5G communication system according to an embodiment of the present invention, and the embodiment is described with a terminal UE as an execution subject. As shown in fig. 1, it comprises the following steps:
step S101, whether the alternative CCE contained in the search space meets the power judgment condition is sequentially judged.
Specifically, in the 5G wireless communication system, the search space is divided into two types: common Search Space (CSS) and UE Specific Search Space (USS); the common search space CSS is mainly used at access and cell handover, while the UE-specific search space USS is used after access. Wherein, the public search space is divided into 5 different types of search spaces: the device comprises a Type0-PDCCH common search space, a Type0A-PDCCH common search space, a Type1-PDCCH common search space, a Type2-PDCCH common search space and a Type3-PDCCH common search space, wherein different expected information can be searched in different spaces, and the different common search spaces correspond to different RNTIs. The Type0-PDCCH common search space is used for broadcasting SIB1, the Type2-PDCCH common search space is used for paging and corresponds to P-RNTI, values of the SI-RNTI and the P-RNTI are fixed in a 5G communication protocol, and terminal UE can perform blind detection on the corresponding PDCCH by using the SI-RNTI and the P-RNTI. The search space referred to in this embodiment includes both a common search space and a UE-specific search space.
In the 5G wireless communication system, if the terminal UE completes initial network access, the terminal UE is allocated with a C-RNTI, and the terminal UE can perform blind detection on the candidate PDCCH by using the C-RNTI. For certain detection equipment or instrument equipment which does not perform a normal network access process, the equipment/terminal does not know the C-RNTI of the equipment/terminal, if a traditional PDCCH detection method is adopted, CCE sets corresponding to all candidate PDCCHs need to be traversed, processing steps of resource demapping, channel estimation equalization, demodulation, descrambling, rate de-matching, channel decoding and CRC (cyclic redundancy check) are performed one by one, and when the CRC fails, the terminal judges that the candidate PDCCHs are invalid. Because the C-RNTI affects both the CCE set position of the specific search space of the UE and the decoded CRC, the detection complexity is extremely high, the requirement on the processing capacity of the terminal is extremely high, and the detection efficiency is low when the traditional PDCCH detection method is adopted for blind detection under the condition that the C-RNTI is not clear.
Based on the above problems, in order to improve the blind detection efficiency, in the embodiment, when the terminal UE performs the blind detection, the candidate CCEs included in the search space of the current time slot are first obtained, then whether each candidate CCE satisfies the power decision condition is sequentially determined, and only when the candidate CCEs satisfy the power decision condition, the candidate CCEs are used as the candidate CCEs to perform further blind detection. In this way, because some alternative CCEs may not transmit PDCCH signals in the alternative CCEs included in the search space, and this part of alternative CCEs are invalid CCEs, the embodiment of the present invention can filter out the obviously invalid alternative CCEs in the search space through power decision, thereby reducing the number of times of blind detection of candidate PDCCHs and greatly reducing the data amount of blind detection. The method is realized based on the energy difference principle of PDCCH resources in the time-frequency domain, wherein the CCEs which are possibly effective are screened from the alternative CCEs by setting a power judgment condition. Specifically, the base station transmits a signal, the transmitted signal is received by the terminal UE after being attenuated by radio electromagnetic wave transmission, and when the CCE carried in the transmitted signal is an effective CCE or an invalid CCE, the signal power received by the terminal UE is different, so that the terminal UE can determine whether the candidate CCE in the search space is the effective CCE based on the received signal power.
In some embodiments, the power decision condition includes a power decision range, when the power of the candidate CCE is within the power decision range, it is determined that the candidate CCE satisfies the power decision condition, and the candidate CCE is used as a candidate CCE to perform a subsequent blind detection process, and when the power of the candidate CCE is not within the power decision range, the candidate CCE does not satisfy the power decision condition, and is an invalid CCE at this time, and the subsequent blind detection process is not required.
In some embodiments, the terminal UE determines a power decision range corresponding to the terminal UE based on the PDCCH that has been successfully received. Specifically, because the CORESET0 corresponding to the common search space includes a broadcast or paging PDCCH channel, and in the 5G communication protocol, values of the SI-RNTI and the P-RNTI are fixed, the terminal UE can obtain the broadcast or paging PDCCH by using the known SI-RNTI or P-RNTI, and calculate the detected power of the broadcast or paging PDCCH, and use the power as the reference receiving power of the terminal. When the method is specifically implemented, the method comprises the following steps:
(1) detecting a PDCCH scrambled by a fixed common RNTI; in this embodiment, the fixed common RNTI is an SI-RNTI or a P-RNTI, and since a value of the SI-RNTI or the P-RNTI is fixed, the terminal UE can blindly detect the PDCCH scrambled by the fixed common RNTI using the fixed common RNTI.
(2) And calculating the detected receiving power of the PDCCH scrambled by the fixed public RNTI, and taking the calculated receiving power as the reference receiving power of the terminal.
In this embodiment, the calculated received power is the power of a common PDCCH (broadcast or paging PDCCH) corresponding to the fixed common RNTI, and is then collectively recorded as the common PDCCH power. The common PDCCH power represents PDCCH receiving power containing valid CCE data, and is the received signal power of the terminal UE after an effective signal sent by the base station is attenuated by the transmission of the radio electromagnetic wave, and generally, the difference between the UE-specific PDCCH power sent by the base station and the common PDCCH power is about +/-3dB, so that the common PDCCH power can be used as the reference received power of the terminal, and then a power interval with the common PDCCH power as the center and the upper and lower amplitudes of about +/-3dB can be used as a power decision range. If the power of a certain alternative CCE in the search space received by the terminal UE is obviously smaller than the power judgment range, the alternative CCE can be considered not to contain PDCCH data, and subsequent PDCCH blind detection processing is not required; if the power of a certain candidate CCE is significantly larger than the power decision range, the candidate CCE may be considered to contain more noise or interference energy, the probability of detection error is higher, the candidate CCE may be divided into invalid CCEs, and subsequent PDCCH blind detection processing is not performed.
In addition, in some embodiments, since the CCE received power may be jittered when affected by interference or channel fading, the power decision range may be set in further consideration of the influence of interference or channel fading on the basis of setting the power decision range based on the difference between the UE-specific PDCCH power and the common PDCCH power. Specifically, the process of determining the power decision range by the terminal UE includes the following steps:
(1) acquiring reference receiving power and power allowable deviation degree of a terminal; wherein, the power allowable deviation degree is related to the following two factors: a. the more serious the interference or channel fading is, the larger the value of the power allowable deviation degree is, and conversely, the smaller the interference or channel fading is, the smaller the value of the power allowable deviation degree is. In specific implementation, the power allowable deviation degree may be calculated in real time, or may be a preset value according to historical data or empirical data by the terminal UE.
(2) And determining the power decision range of the terminal according to the reference received power and the power allowable deviation degree. In one embodiment, assuming that the reference received power is denoted as P0 and the power allowable deviation is denoted as P1, the power decision range can be expressed as (P0-P1, P0+ P1). Of course, in other embodiments, the power decision range may also be centered on the reference received power P0 and distributed asymmetrically, in which case the power decision range may be represented as (P0-P1, P0+ P2), in which case P1 is not equal to P2.
In some embodiments, the alternative CCEs may be all CCEs in the search space of the current slot.
In some embodiments, in order to further improve the blind detection efficiency of the terminal UE, one pre-screening may be performed on all CCEs in the search space, and the CCEs in the pre-screened search space are used as candidate CCEs. Specifically, the pre-screening may screen out CCEs occupied by PDCCHs already detected by the terminal UE, and includes the following steps: acquiring a CCE of the detected PDCCH scrambled by the fixed public RNTI as a target CCE; if the target CCE exists in all CCE sets contained in the search space, deleting the target CCE from all CCE sets to obtain alternative CCE sets, and then carrying out power judgment on each alternative CCE in the alternative CCE sets.
In some embodiments, sequentially determining whether the candidate CCEs included in the search space satisfy the power decision condition specifically includes: and sequentially judging whether the average power of the alternative CCEs contained in the search space meets the power judgment condition or not. The method for calculating the average power of the CCE is common knowledge in the art, and does not belong to the improvement point of the present invention, and therefore, the detailed description of the implementation of the method is not provided in the present invention.
Step S102, when the alternative CCE meets the power judgment condition, the alternative CCE is used as the candidate CCE, and the power judgment is carried out on all the alternative CCEs in the search space to obtain a candidate CCE set comprising all the candidate CCEs.
Step S103, determining a candidate PDCCH set according to the candidate CCE set, and performing validity detection on the candidate PDCCH in the candidate PDCCH set to detect a valid PDCCH, wherein the validity detection comprises decoding the candidate PDCCH and performing reverse coding on a decoding result to obtain a local coding result, and when the similarity between the local coding result and a received coding result meets a similarity threshold, the candidate PDCCH is judged to be the valid PDCCH.
In some embodiments, determining a set of candidate PDCCHs from the set of candidate CCEs, performing validity detection on the candidate PDCCHs in the set of candidate PDCCHs comprises: and sequentially selecting candidate CCEs of corresponding aggregation levels from the candidate CCE set according to a preset sequence of the aggregation levels, combining the candidate CCEs into candidate PDCCHs, and carrying out validity detection on all the candidate PDCCHs corresponding to the aggregation levels, wherein the candidate PDCCHs corresponding to all the aggregation levels form a candidate PDCCH set.
The aggregation levels include 5 levels, namely 16, 8, 4, 2, and 1, and the terminal UE may preset an order of the aggregation levels, that is, a preset order, where the preset order may be from high to low, such as 16, 8, 4, 2, and 1, or from low to high, such as 1, 2, 4, 8, and 16. Generally, the higher the aggregation level is, the lower the code rate of the candidate PDCCH is, and the higher the reliability of detecting the valid PDCCH is, therefore, in this embodiment, the preset order of the aggregation level is set to 16, 8, 4, 2, and 1. And then, the terminal UE sequentially takes out candidate CCEs of a certain specific aggregation level from the candidate CCE set, combines the candidate CCEs into candidate PDCCHs aiming at the candidate CCEs under the aggregation level, and then sequentially carries out blind detection on the candidate PDCCHs under the aggregation level to detect whether the candidate PDCCHs are effective PDCCHs or not. And then, taking out the candidate CCEs of the next aggregation level from the candidate CCE set according to the preset sequence of the aggregation levels, and repeating the steps until the candidate PDCCHs under all aggregation levels are detected.
In some embodiments, the step of validity checking the PDCCH candidate comprises:
(1) demodulating, descrambling and rate de-matching the candidate PDCCH to obtain a bit stream d, where the bit stream d is a coding result received by the terminal UE and is recorded as a received coding result in this embodiment;
(2) polar decoding is carried out on the bit stream d to obtain decoding soft bits, and the decoding soft bits are judged to obtain decoding DCI bit stream;
(3) carrying out forward Polar coding on the DCI bit stream obtained by decoding to obtain a bit stream d ', wherein the bit stream d' is a local coding result;
(4) and judging whether the similarity of the bit stream d and the bit stream d' meets a similarity threshold, if so, judging the candidate PDCCH as an effective PDCCH, and if not, judging the candidate PDCCH as an ineffective PDCCH.
Then, the RNTI corresponding to the valid PDCCH, such as C-RNTI, can be obtained from the decoding result of the valid PDCCH, i.e., the C-RNTI related to the valid PDCCH can be obtained from the bit information extracted from the CRC mask portion.
It should be noted that demodulating, descrambling, de-rate matching, and Ploar decoding on PDCCH candidates are all prior art in the field, and the embodiments of the present invention will not be described in detail.
Compared with the prior art, the PDCCH blind detection method for the 5G communication system provided by the embodiment of the invention firstly judges whether the alternative CCE contained in the search space meets the power judgment condition, when the alternative CCE meets the power judgment condition, the alternative CCE is taken as the candidate CCE, then the candidate PDCCH set is determined according to the candidate CCE set, then the candidate PDCCH is decoded and the decoding result is reversely coded to obtain the local coding result, when the similarity between the local coding result and the receiving coding result meets the similarity threshold, the candidate PDCCH is judged to be the effective PDCCH, then the RNTI corresponding to the effective PDCCH can be obtained, the alternative CCE is screened through the power judgment condition, the ineffective CCE can be filtered out, thereby the data volume of the candidate PDCCH is reduced, meanwhile, the candidate PDCCH is decoded and then reversely coded, and the local coding result is compared with the receiving coding result, the effectiveness of the candidate PDCCH can be determined and the associated RNTI can be detected, so that the blind detection processing complexity of the terminal is greatly reduced, and the blind detection efficiency is improved.
Example 2
Please refer to fig. 2, which is a flowchart illustrating a specific implementation procedure for determining candidate CCE sets in the PDCCH blind detection method for a 5G communication system according to the present invention. As shown in fig. 2, it comprises the following steps:
step S201 detects the PDCCH scrambled by the persistent common RNTI, and calculates the REG average power or CCE average power of the PDCCH as the reference received power of the terminal.
Step S202, calculating the allowable power deviation degree, and determining the power judgment range according to the reference received power and the allowable power deviation degree.
Step S203, deleting the CCEs of the PDCCH scrambled by the common RNTI which are detected from all CCE sets corresponding to the search space to obtain an alternative CCE set.
Step S204, sequentially determining whether the average power of the candidate CCEs in the candidate CCE aggregation is within the power determination range, if so, executing step S205, otherwise, executing step S206.
Step S205 executes step S207 with the candidate CCE as the candidate CCE.
Step S206 deletes the candidate CCE from the candidate CCE set, and step S207 is executed.
Step S207, determining that all the candidate CCEs in the candidate CCE aggregation have been subjected to power decision, if the determination result is yes, executing step S208, otherwise, repeatedly executing steps S204 to S207.
In step S208, a candidate CCE set is determined.
In the embodiment, for all CCEs (namely all CCE sets) contained in the search space, a CCE of a PDCCH which has been successfully detected is filtered to obtain an alternative CCE set, then a power decision range is calculated according to the detected PDCCH scrambled by the fixed public RNTI, and power decision is sequentially performed on the alternative CCEs in the alternative CCE set, so that an invalid CCE is filtered, a candidate CCE set is obtained, and a subsequent terminal can perform blind detection on only the candidate PDCCHs corresponding to the candidate CCE set, so that the data processing amount of the blind detection is greatly reduced, and the blind detection efficiency is improved.
Example 3
Please refer to fig. 3, which is a flowchart illustrating a PDCCH blind detection candidate based on a determined CCE candidate set according to the present invention. As shown in fig. 3, it includes the following steps:
in step S301, the order of aggregation levels is set in advance.
Step S302 is to extract candidate CCEs of a certain aggregation level from the candidate CCE aggregation, and combine the candidate CCEs in the aggregation level into candidate PDCCHs.
Step S303, demodulating, descrambling and rate de-matching the candidate PDCCH to obtain a bit stream d;
step S304, Polar decoding is carried out on the bit stream d to obtain decoding soft bits;
step S305, the decoding soft bit is judged to obtain a decoding DCI bit stream;
step S306, forward Polar coding is carried out on the DCI bit stream obtained by decoding to obtain a bit stream d';
step S307, determining whether the similarity between the bit stream d and the bit stream d' satisfies a similarity threshold, if yes, executing step S308, and if no, determining the candidate PDCCH as an invalid PDCCH.
Step S308, the candidate PDCCH is judged to be an effective PDCCH, and all candidate CCEs corresponding to the effective PDCCH are deleted from the candidate CCE set.
Step S309, determining whether validity detection of all candidate PDCCHs at the current aggregation level is completed, if yes, performing step S310, otherwise, returning to step S303 to continue validity detection of the next candidate PDCCH at the aggregation level.
Step S310, judging whether validity detection of the candidate PDCCHs of all aggregation levels is finished, if so, ending the process, otherwise, returning to step S302 to continue to take out the candidate CCE of the next aggregation level from the candidate CCE set according to the set sequence of the aggregation levels.
Compared with the prior art, in the PDCCH blind detection method for the 5G communication system, after the candidate CCE set is determined, the candidate PDCCHs at a certain aggregation level are sequentially determined according to the set sequence of the aggregation level, the candidate PDCCHs are decoded and reversely encoded after the decoding is completed, and the local encoding result is compared with the received encoding result, so that the validity of the candidate PDCCHs can be determined and the associated RNTI can be detected, the blind detection processing complexity of the terminal is greatly reduced, and the blind detection efficiency is improved.
Example 4
The present embodiment provides a terminal, including a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor implements the steps of the PDCCH blind detection method for a 5G communication system as described in embodiment 1, embodiment 2, or embodiment 3.
Example 5
The present embodiment provides a 5G communication system including the terminal described in embodiment 4.
Example 6
The present embodiment provides a computer-readable storage medium, having stored therein a plurality of instructions adapted to be loaded by a processor to perform the steps of the PDCCH blind detection method for a 5G communication system as recited in embodiment 1 or 2 or 3.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A PDCCH blind detection method for a 5G communication system is characterized by comprising the following steps:
sequentially judging whether the alternative CCE contained in the search space meets power judgment conditions;
when the alternative CCE meets the power judgment condition, taking the alternative CCE as a candidate CCE, and performing power judgment on all the alternative CCEs in the search space to obtain a candidate CCE set comprising all the candidate CCEs;
determining a candidate PDCCH set according to the candidate CCE set, and performing validity detection on the candidate PDCCH in the candidate PDCCH set to detect a valid PDCCH, wherein the validity detection comprises decoding the candidate PDCCH and performing reverse coding on a decoding result to obtain a local coding result, and when the similarity between the local coding result and a received coding result meets a similarity threshold value, judging the candidate PDCCH as the valid PDCCH;
wherein the power decision condition comprises a power decision range, and when the power of the alternative CCE is within the power decision range, the alternative CCE meets the power decision condition; before the step of sequentially judging whether the candidate CCEs contained in the search space satisfy the power decision condition, the method further comprises:
acquiring reference receiving power and power allowable deviation degree of a terminal;
determining a power judgment range of the terminal according to the reference received power and the power allowable deviation degree;
the step of obtaining the reference received power of the terminal comprises the following steps:
detecting a PDCCH scrambled by a fixed common RNTI;
and calculating the received power of the detected PDCCH scrambled by the fixed public RNTI, and taking the received power as the reference received power of the terminal.
2. The PDCCH blind detection method for a 5G communication system according to claim 1, wherein sequentially judging whether the candidate CCEs included in the search space satisfy the power decision condition specifically includes:
and sequentially judging whether the average power of the alternative CCEs contained in the search space meets the power judgment condition or not.
3. The PDCCH blind detection method for a 5G communication system as claimed in claim 1, wherein the received power is REG average power or CCE average power.
4. The PDCCH blind detection method for 5G communication system according to claim 1, wherein the step of sequentially determining whether the candidate CCEs included in the search space satisfy the power decision condition further includes:
acquiring a CCE of the detected PDCCH scrambled by the fixed public RNTI as a target CCE;
and if the target CCE exists in all CCE sets contained in the search space, deleting the target CCE from all CCE sets to obtain an alternative CCE set.
5. The method of claim 1, wherein the determining a candidate PDCCH set according to the candidate CCE set, and the detecting the validity of the candidate PDCCHs in the candidate PDCCH set comprises:
and selecting candidate CCEs of corresponding aggregation levels from the candidate CCE set in sequence according to a preset sequence of the aggregation levels, combining the candidate CCEs into a candidate PDCCH, and carrying out validity detection on the candidate PDCCH corresponding to the aggregation level, wherein the candidate PDCCHs corresponding to all the aggregation levels form the candidate PDCCH set.
6. The PDCCH blind detection method for a 5G communication system as claimed in any one of claims 1 to 5, wherein the step of detecting the validity of the candidate PDCCHs comprises:
demodulating, descrambling and rate de-matching the candidate PDCCH to obtain a bit stream d, wherein the bit stream d is a receiving and coding result;
polar decoding is carried out on the bit stream d to obtain decoding soft bits, and the decoding soft bits are judged to obtain decoding DCI bit stream;
carrying out forward Polar coding on the DCI bit stream obtained by decoding to obtain a bit stream d ', wherein the bit stream d' is a local coding result;
and judging whether the similarity of the bit stream d and the bit stream d' meets a similarity threshold, and judging the candidate PDCCH as an effective PDCCH when the judgment result is yes.
7. The PDCCH blind detection method for a 5G communication system as claimed in claim 5, wherein the step of detecting the validity of the PDCCH candidates corresponding to any aggregation level further comprises:
and when the candidate PDCCH is an effective PDCCH, acquiring the RNTI corresponding to the effective PDCCH from the decoding result of the effective PDCCH, and deleting the candidate CCE corresponding to the effective PDCCH from the candidate CCE set.
8. A terminal, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to implement the steps of the PDCCH blind detection method for a 5G communication system according to any one of claims 1 to 7.
9. A computer readable storage medium, having stored therein at least one instruction which is loaded and executed by a processor to implement the steps of the PDCCH blind detection method for a 5G communication system according to any one of claims 1 to 7.
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