CN105490779B - Physical Downlink Control Channel blind checking method - Google Patents
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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
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Abstract
The present invention relates to a kind of Physical Downlink Control Channel blind checking methods, wherein the method includes the following steps：(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained；(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI；(3) CRC check is carried out to obtain the value of valid wireless Network Temporary Identifier RNTI to the set of the radio network temporary identifier RNTI.Using the Physical Downlink Control Channel blind checking method of this kind of structure, channel equalization, demodulation descrambling only handle primary, algorithm is realized simple, it is effectively reduced the number of solution rate-matched and folding coding, improve the efficiency of blind examination, candidate RNTI set is determined according to search space CCE initial position, be ensure that CRC check is only handled possible RNTI value, is further improved the efficiency of blind examination.
Description
Technical field
The present invention relates to field of communication technology more particularly to blind examination, in particular to a kind of Physical Downlink Control Channel blind examinations
Survey method.
Background technique
In LTE (Long Term Evolution) system, PDCCH (Physical Downlink Control
Channel, Physical Downlink Control Channel) bearing downlink control information (DCI, downlink control information),
Such as upstream dispatching instructions, downlink data transmission instruction, common control information, it is correct demodulation and decoding be business datum just
True received premise.By the way of multiple users share resource, terminal is needed in entire control area with one for the design of PDCCH
Determine rule search control signaling.In a downlink subframe, multiple DCI carry out coding and rate matching procedure, by coded-bit
The operation such as scrambled jointly after multiplexing, modulate and interweave.
Current PDCCH blind checking method is for UE (User, user), and this method is by known RNTI
(Radio Network Tempory Identity, radio network temporary identifier) calculates the initial position of DCI information, then right
All polymerization grade traversals are primary, CRC validation carried out to decoding result using RNTI, to obtain one's own DCI information.
The calculation formula of specific search space is as follows：
Wherein L indicates polymerization grade；K indicates the subframe number in a radio frames；NCCE,kIndicate k-th of subframe control zone
Total CCE number in domain；M indicates candidate PDCCH set, i=0 ..., L-1.
For public search space Yk=0；For user's dedicated search space, YkIt is relevant to RNTI and subframe number
One value, is defined as：Yk=(A × Yk-1) mod D, wherein Y-1=nRNTI, A=39827, D=65537.
In the case where each user RNTI is unknown, if needing that (RNTI range is to all RNTI using existing method
It 1-65535) calculates one time, for existing level of hardware, operation time can be considerably long.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, provides one kind and be able to solve existing PDCCH
The low Physical Downlink Control Channel blind checking method of blind Detecting blind detection efficiency in the case where RNTI is unknown.
To achieve the goals above, Physical Downlink Control Channel blind checking method of the invention has following constitute：
The Physical Downlink Control Channel blind checking method, is mainly characterized by, and the method includes the following steps：
(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained；
(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI；
(3) CRC check is carried out to obtain valid wireless network to the set of the radio network temporary identifier RNTI
The value of temporary identifier RNTI.
Further, the step (1) specifically includes following steps：
(1.1) to the data in the Physical Downlink Control Channel of acquisition carry out solution resource impact, solution layer mapping, deinterleave,
Demodulation and scramble process, to obtain the multiplexed data of Downlink Control Information DCI；
(1.2) the multiplexed data of Downlink Control Information DCI are handled to obtain effective position CCE and effective CCE
Size.
Further, the step (1.2) specifically includes following steps：
(1.2.1) carries out power calculation to the data after descrambling；
(1.2.2) sums up the power of continuous eight data informations, to obtain the general power of a REG；
The general power that (1.2.3) obtains the REG is greater than the position REG of threshold value, and obtains effective REG number
NREGuse, effective REG is that the general power of REG is greater than the REG of threshold value.
Still further, the step (2) specifically includes following steps：
(2.1) the initial position N of CCE is obtained in the search space according to effective REGCCEstart；
(2.2) set of radio network temporary identifier RNTI is determined according to the initial position of CCE.
Still further, the step (2.1) specifically includes following steps：
(2.1.1) is according to effective REG several NREGuseIt calculates and obtains effective CCE number：
NCCEuse=NREGuse/9
(2.1.2) is defined according to the effective CCE several sizes to the search space；
(2.1.3) determines the initial position N of CCE according to the size of the search spaceCCEstart。
Still further, the step (2.1.2) is specially：
When the number of the effective CCE is more than or equal to 8, the search space is [8 42 1]；
When the number of the effective CCE is more than or equal to 4 and when less than 8, the search space is [4 2 1]；
When the number of the effective CCE is more than or equal to 2 and when less than 4, the search space is [2 1]；
When the number of the effective CCE is less than 2, the search space is [1].
Still further, the step (2.2) specifically includes following steps：
(2.2.1) successively carries out blind Detecting to possible search space size；
The initial position N for the CCE that (2.2.2) is determined according to current search spaceCCEstartDetermine possible Yk,tempValue
Wherein,M=0~M(L)-1；L indicates polymerization grade；K expression one is wireless
Subframe number in frame, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE, k
For the CCE total number in the control domain of subframe k；
(2.2.3) basis recycles the value of radio network temporary identifier RNTI and passes through radio network temporary identifier
RNTI calculates the value of Yk；
Whether the value of (2.2.4) judgement Yk is equal to Yk,temp；
(2.2.5) is if the value of the Yk is equal to Yk,temp, then the value of radio network temporary identifier RNTI is stored in
The set of radio network temporary identifier RNTI；
(2.2.6) is if the value of the Yk is not equal to Yk,temp, then the value of radio network temporary identifier RNTI is abandoned.
Still further, the step (3) specifically includes following steps：
(3.1) data in current search space are obtained, and carry out solution rate-matched and decoding processing；
(3.2) value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI is recycled
Processing, and radio network temporary identifier RNTI descrambling and CRC check are carried out to decoding treated data；
(3.3) if CRC check is correct, the value and Downlink Control Information of radio network temporary identifier RNTI are exported
DCI information, and terminate to recycle the value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI；
(3.4) if CRC check mistake, continue step (3.2).
Using the Physical Downlink Control Channel blind checking method in the invention, compared with prior art, have below
Beneficial technical effect：
The present invention is not grouped data, and therefore, channel equalization, demodulation descrambling only handle primary, algorithm realization letter
It is single；Solution rate-matched and folding coding operation are carried out according to the data of search space, is effectively reduced solution rate-matched and volume
The number of product decoding, improves the efficiency of blind examination；Candidate RNTI set is determined according to search space CCE initial position, ensure that
CRC check is only handled possible RNTI value, further improves the efficiency of blind examination.
Detailed description of the invention
Fig. 1 is the step flow chart of Physical Downlink Control Channel blind checking method of the invention.
Fig. 2 is the step flow chart that the method for effective CCE is determined in one embodiment of the invention.
Fig. 3 is the step process that the method for set of radio network temporary identifier RNTI is determined in one embodiment of the invention
Figure.
Fig. 4 is to carry out CRC check to the set of the radio network temporary identifier RNTI in one embodiment of the invention
Method step flow chart.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
Refering to Figure 1, Physical Downlink Control Channel blind checking method of the invention includes the following steps：
(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained；
(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI；
(3) CRC check is carried out to obtain valid wireless network to the set of the radio network temporary identifier RNTI
The value of temporary identifier RNTI.
In a preferred embodiment, it please refers to shown in Fig. 2, the step (1) specifically includes following steps：
(1.1) to the data in the Physical Downlink Control Channel of acquisition carry out solution resource impact, solution layer mapping, deinterleave,
Demodulation and scramble process, to obtain the multiplexed data of Downlink Control Information DCI；
(1.2) the multiplexed data of Downlink Control Information DCI are handled to obtain effective position CCE and effective CCE
Size.
In a kind of more preferably embodiment, the step (1.2) specifically includes following steps：
(1.2.1) carries out power calculation to the data after descrambling；
(1.2.2) sums up the power of continuous eight data informations, to obtain the general power of a REG；
The general power that (1.2.3) obtains the REG is greater than the position REG of threshold value, and obtains effective REG number
NREGuse, effective REG is that the general power of REG is greater than the REG of threshold value.
In a preferred embodiment, it please refers to shown in Fig. 3, the step (2) specifically includes following steps：
(2.1) the initial position N of CCE is obtained in the search space according to effective REGCCEstart；
(2.2) set of radio network temporary identifier RNTI is determined according to the initial position of CCE.
In a kind of more preferably embodiment, the step (2.1) specifically includes following steps：
(2.1.1) is according to effective REG several NREGuseIt calculates and obtains effective CCE number：
NCCEuse=NREGuse/9
(2.1.2) is defined according to the effective CCE several sizes to the search space；
(2.1.3) determines the initial position N of CCE according to the size of the search spaceCCEstart。
In a kind of more preferably embodiment, the step (2.1.2) is specially：
When the number of the effective CCE is more than or equal to 8, the search space is [8 42 1]；
When the number of the effective CCE is more than or equal to 4 and when less than 8, the search space is [4 2 1]；
When the number of the effective CCE is more than or equal to 2 and when less than 4, the search space is [2 1]；
When the number of the effective CCE is less than 2, the search space is [1].
In a kind of more preferably embodiment, the step (2.2) specifically includes following steps：
(2.2.1) successively carries out blind Detecting to possible search space size；
The initial position N for the CCE that (2.2.2) is determined according to current search spaceCCEstartDetermine possible Yk,tempValue
Wherein,M=0~M(L)-1；L indicates polymerization grade；K expression one is wireless
Subframe number in frame, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE, k
For the CCE total number in the control domain of subframe k；It is that the OFDM symbol number occupied according to PDCCH calculates total RE resource, then subtracts
The occupied RE resource of CRS, PCFICH, PHICH is gone, the available RE resource of PDCCH is acquired, RE sum is exactly CCE total divided by 36
Number.
(2.2.3) basis recycles the value of radio network temporary identifier RNTI and passes through radio network temporary identifier
RNTI calculates the value of Yk；
Whether the value of (2.2.4) judgement Yk is equal to Yk,temp；
(2.2.5) is if the value of the Yk is equal to Yk,temp, then the value of radio network temporary identifier RNTI is stored in
The set of radio network temporary identifier RNTI；
(2.2.6) is if the value of the Yk is not equal to Yk,temp, then the value of radio network temporary identifier RNTI is abandoned.
In a preferred embodiment, it please refers to shown in Fig. 3, the step (3) specifically includes following steps：
(3.1) data in current search space are obtained, and carry out solution rate-matched and decoding processing；
(3.2) value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI is recycled
Processing, and radio network temporary identifier RNTI descrambling and CRC check are carried out to decoding treated data；
(3.3) if CRC check is correct, the value and Downlink Control Information of radio network temporary identifier RNTI are exported
DCI information, and terminate to recycle the value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI；
(3.4) if CRC check mistake, continue step (3.2).
In practical applications, a kind of physical downlink control channel PDCCH blind checking method is present embodiments provided, including：
Step 1 obtains effective position CCE and the size of effective CCE of PDCCH.Received data are reflected by solution resource
It penetrates, solve the relevant treatments acquisition multiplexed data of DCI such as layer is mapped, deinterleaved, demodulation descrambles, to the multiplexed data of DCI
It carries out judgement and obtains the effective position REG and the size of effective REG.
Step 2 determines candidate RNTI set according to the initial position of possible search space CCE.According to the big of effective REG
It is small that possible search space size is defined, so that it is determined that the initial position of possible search space CCE, and it is empty according to search
Between calculation formula RNTI value possible under same polymeric grade is defined, determine candidate RNTI gather.
Step 3 gathers candidate RNTI and carries out CRC (Cyclic Redundancy Check, cyclic redundancy check)
Verification searches out effective RNTI.Data in search space are handled by solution rate-matched and decoding, then to candidate RNTI collection
It closes and carries out blind examination CRC check, effective RNTI value is determined according to CRC check result.
Wherein, the determination method of effective REG is as shown in Figure 2.Steps are as follows：
(a.1) power calculation is carried out to the data after descrambling.Since data are demodulated, each RE resource has two-way
Data information；
(a.2) power of continuous 8 data informations is summed up, seeks the general power of a REG, in the money of PDCCH
REG is indivisible unit in the distribution of source, therefore calculates the general power of REG；
(a.3) REG power is compared with threshold value, selects effective position REG greater than threshold value, and count effective
The number N of REGREGuse。
Secondly, determining the method for candidate RNTI set as shown in figure 3, steps are as follows：
(b.1) according to the number N of effective REGREGuseCalculate effective CCE number, NCCEuse=NREGuse/9；
(b.2) according to effective CCE several NCCEuseSize search space size is defined.If being greater than effective
CCE number be greater than 8, then search space be [8 42 1]；If effective CCE number is [4,8) in, then search is empty
Between be [4 2 1]；If effective CCE number [2,4) it is interior, then search space is [2 1]；If effective CCE number
Less than 2, then search space is [1].
(b.3) at the beginning of the CCE for successively carrying out blind examination to possible search space size, and being determined according to current search space
Beginning position NCCEstartDetermine the value of possible Yk, formula is as follows
Wherein,M=0~M(L)-1；L indicates polymerization grade；K expression one is wireless
Subframe number in frame, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE, k
For the CCE total number in the control domain of subframe k；；
(b.4) it determines candidate RNTI set, the value of RNTI is recycled, if passing through the value etc. of the calculated Yk of RNTI
In Yk,temp, then this RNTI is put into candidate RNTI.
Furthermore RNTI checking process figure is as shown in figure 4, steps are as follows：
(c.1) data in current search space are taken out, and carry out solution rate-matched and decoding processing；
(c.2) circular treatment is carried out to the value in candidate RNTI set, RNTI descrambling and the school CRC is carried out to data after decoding
It tests；
(c.3) if verification is correct, effective RNTI value and DCI information, and end loop are exported, if verification is wrong
Accidentally, then it returns (c.2), until all candidate RNTI are traversed one time.
Using the Physical Downlink Control Channel blind checking method in the invention, compared with prior art, have below
Beneficial technical effect：
The present invention is not grouped data, and therefore, channel equalization, demodulation descrambling only handle primary, algorithm realization letter
It is single；Solution rate-matched and folding coding operation are carried out according to the data of search space, is effectively reduced solution rate-matched and volume
The number of product decoding, improves the efficiency of blind examination；Candidate RNTI set is determined according to search space CCE initial position, ensure that
CRC check is only handled possible RNTI value, further improves the efficiency of blind examination.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (2)
1. a kind of Physical Downlink Control Channel blind checking method, which is characterized in that the method includes the following steps：
(1) effective position CCE of data and the size of effective CCE in Physical Downlink Control Channel are obtained；Including following step
Suddenly：
(1.1) to the data in the Physical Downlink Control Channel of acquisition carry out solution resource impact, solution layer mapping, deinterleave,
Demodulation and scramble process, to obtain the multiplexed data of Downlink Control Information DCI；
(1.2.1) carries out power calculation to the data after descrambling；
(1.2.2) sums up the power of continuous eight data informations, to obtain the general power of a REG；
The general power that (1.2.3) obtains the REG is greater than the position REG of threshold value, and obtains effective REG several NREGuse, institute
The effective REG stated is that the general power of REG is greater than the REG of threshold value；
(1.2) the multiplexed data of Downlink Control Information DCI are handled to obtain the big of effective position CCE and effective CCE
It is small；
(2) according to the initial position N of CCE in search spaceCCEstartDetermine the set of radio network temporary identifier RNTI；Wherein wrap
Include following steps：
(2.1) the initial position N of CCE is obtained in the search space according to effective REGCCEstart；
(2.1.1) is according to effective REG several NREGuseIt calculates and obtains effective CCE number：
NCCEuse=NREGuse/9
(2.1.2) is defined according to the effective CCE several sizes to the search space；
(2.1.3) determines the initial position N of CCE according to the size of the search spaceCCEstart；
(2.2) set of radio network temporary identifier RNTI is determined according to the initial position of CCE；
(2.2.1) successively carries out blind Detecting to possible search space size；
The initial position N for the CCE that (2.2.2) is determined according to current search spaceCCEstartDetermine possible Yk,tempValue
Wherein,M=0~M(L)-1；L indicates polymerization grade；K is indicated in a radio frames
Subframe number, m=0 ..., M-1, M are the number of the Physical Downlink Control Channel candidate monitored in search space, NCCE,kFor subframe
CCE total number in the control domain of k；
(2.2.3) recycle and count by radio network temporary identifier RNTI according to the value of radio network temporary identifier RNTI
Calculate the value of Yk；
Whether the value of (2.2.4) judgement Yk is equal to Yk,temp；
(2.2.5) is if the value of the Yk is equal to Yk,temp, then the value of radio network temporary identifier RNTI is stored in wirelessly
The set of Network Temporary Identifier RNTI；
(2.2.6) is if the value of the Yk is not equal to Yk,temp, then the value of radio network temporary identifier RNTI is abandoned；
(3) interim to obtain valid wireless network to the set progress CRC check of the radio network temporary identifier RNTI
Identify the value of RNTI；Including following steps：
(3.1) data in current search space are obtained, and carry out solution rate-matched and decoding processing；
(3.2) value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI is carried out at circulation
Reason, and radio network temporary identifier RNTI descrambling and CRC check are carried out to decoding treated data；
(3.3) if CRC check is correct, the value and Downlink Control Information DCI letter of radio network temporary identifier RNTI are exported
Breath, and terminate to recycle the value of the radio network temporary identifier RNTI in the set of radio network temporary identifier RNTI；
(3.4) if CRC check mistake, continue step (3.2).
2. Physical Downlink Control Channel blind checking method according to claim 1, which is characterized in that the step
(2.1.2) is specially：
When the number of the effective CCE is more than or equal to 8, the search space is [8 42 1]；
When the number of the effective CCE is more than or equal to 4 and when less than 8, the search space is [4 2 1]；
When the number of the effective CCE is more than or equal to 2 and when less than 4, the search space is [2 1]；
When the number of the effective CCE is less than 2, the search space is [1].
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| CN109309547B (en) | 2017-07-28 | 2020-09-22 | 维沃移动通信有限公司 | Downlink control information detection method, transmission method, terminal and network equipment |
| CN107911200B (en) * | 2018-01-05 | 2020-07-24 | 武汉虹旭信息技术有限责任公司 | L TE system PDCCH blind detection realization method |
| CN110034835B (en) * | 2018-01-12 | 2024-04-12 | 华为技术有限公司 | Signal detection method and device |
| CN109120357B (en) * | 2018-08-27 | 2021-08-24 | 京信网络系统股份有限公司 | Signal search detection method, device, terminal and system |
| CN109952730B (en) * | 2019-02-14 | 2021-07-09 | 香港应用科技研究院有限公司 | Method and system for decoding received channel signal |
| US10812221B2 (en) | 2019-02-14 | 2020-10-20 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Channel signal decoding with unknown station identifier information using power detection and redundancy reduction-based error checking |
| CN109673056B (en) * | 2019-03-11 | 2022-04-05 | 重庆邮电大学 | PDCCH (physical Downlink control channel) adaptive blind detection method based on power measurement in 5G (third generation) system |
| CN110855587A (en) * | 2019-11-19 | 2020-02-28 | 重庆邮电大学 | Blind detection method for downlink control channel of 5G system |
| CN112202530B (en) * | 2020-09-30 | 2024-03-22 | 芯象半导体科技(北京)有限公司 | Channel blind detection method and device, communication device and storage medium |
| CN112202531B (en) * | 2020-09-30 | 2024-05-28 | 芯象半导体科技(北京)有限公司 | Channel blind detection method and device, communication device and storage medium |
| CN114696962B (en) * | 2022-06-02 | 2022-08-09 | 杰创智能科技股份有限公司 | Blind detection method, device, equipment and medium based on unknown RNTI |
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