CN103731236A - Blind detection method for physical downlink control channel - Google Patents
Blind detection method for physical downlink control channel Download PDFInfo
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- CN103731236A CN103731236A CN201210390801.4A CN201210390801A CN103731236A CN 103731236 A CN103731236 A CN 103731236A CN 201210390801 A CN201210390801 A CN 201210390801A CN 103731236 A CN103731236 A CN 103731236A
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Abstract
The invention discloses a blind detection method for a physical downlink control channel. Due to the facts that the mode of combined blind detection is adopted, at least two lengths are adopted for rate matching removal, and the relations between indexes including a PDCCH detection threshold, the missing detection probability, the false detection probability, the average detection frequency and the maximum detection frequency are balanced, the PDCCH detection accuracy is overall improved, and the risk of PDCCH false detection is reduced.
Description
Technical field
The application relates to mobile communication technology field, be particularly related to Long Term Evolution project (LTE, Long TermEvolution)/LTE-A system, relate in particular to the method for a kind of Physical Downlink Control Channel (PDCCH, Physical DownlinkControl Channel) blind check.
Background technology
PDCCH in 3GPP LTE/LTE-A system has carried various types of Downlink Control Information.Base station, according to the actual channel condition of subscriber equipment (UE), by distributing different running time-frequency resources, adopts rational modulating-coding, and control information is sent to UE.UE does not know the control channel element (CCE that current PDCCH takies conventionally, Control Channel Elements) number size, that transmit is any Downlink Control Information (DCI, Downlink Control Information) format information, do not know the information oneself needing is in which position yet.But UE knows own current in what information of expectation, and the information of for example expecting at idle (Idle) state UE is paging, SI; What initiate to expect after random access is that Random Access Channel (RACH) is replied, and when having upstream data etc. to be sent, expects ULGrant etc.For different expectation information for UE corresponding Radio Network Temporary Identifier (RNTI) go to be cyclic redundancy check (CRC) code (CRC with CCE information, Cyclic Redundancy Check) verification, if CRC check success, UE just knows that this information is oneself needs so, also can further know corresponding DCI form, modulation system, thereby solve DCI content.So-called blind check process that Here it is.
If UE is searched for over successively according to the order of CCE, the amount of calculation of UE side is appreciable so, especially larger for bandwidth ratio, the system that CCE number is many, therefore, the characteristics such as the quality of blind check efficiency and the data processing amount of system and reaction time have very large contacting, and blind check efficiency is higher, and systematic function is just more superior.UE is by mode (the different CCE set of PDCCH blind check, the detection number of times of trying one's best few in different search volumes and statistical significance) reception Downlink Control Information, should prevent all kinds of DCI flase drops, guarantee again rational detection threshold, reduce false dismissal probability.
In prior art, PDCCH blind check process comprises:
Step 101: at each descending sub frame, UE detects controlled area OFDM symbol, to PDCCH channel carry out demapping, demodulation is disturbed, the data after descrambling are as the input data of blind check.
Step 102: calculate current search original position.
Step 103: read CCEs according to CCE set class L in the original position of corresponding search volume, the data that read are carried out to rate de-matching, Viterbi (Viterbi) decoding, and then will obtain data and carry out RNTI descrambling and CRC check.
Step 104: if verification succeeds receives data process ends; Otherwise, abandon this time search, continue execution step 105;
Step 105: judge whether to have searched for the candidate PDCCHs when all in front space, if not, search original position adds L, returns to step 103 and searches for next time; If so, perform step 106.
Step 106: judge whether the complete all set classes of blind check, if so, blind check finishes, otherwise, enter next set class and return to step 102.
There is following shortcoming in PDCCH blind check process of the prior art:
(1), different RNTI descrambling exist probability of false detection, as base station sends to DCI of certain user, due to the variation of channel and the interference of noise, other users adopt different RNTI blind checks, and equally likely CRC check is correct.
(2), different length DCI rate de-matching introduce probability of false detection, as base station sends to DCI of certain user, due to the variation of channel and the interference of noise, this user's blind check feasible solution is separated out the DCI of multiple different lengths, and CRC check is all correct.
(3), the probability of miscarriage of justice of 16bit CRC check in low signal-to-noise ratio environment, if certain user is due to the variation of channel and the interference of noise, blind check result equally likely CRC check is correct, and parses the DCI that base station does not send.
Summary of the invention
The application provides a kind of method of Physical Downlink Control Channel blind check, can reduce probability of false detection.
The method of a kind of Physical Downlink Control Channel blind check that the embodiment of the present application provides, comprising:
According to control channel Elements C CE set class L, in the original position of corresponding search volume, read CCEs;
Adopt the first length to carry out rate de-matching to the data that read, Viterbi decoding, and then will obtain data and carry out Radio Network Temporary Identifier RNTI descrambling and cyclic redundancy check (CRC) code CRC check, the Downlink Control Information DCI wherein obtaining after RNTI descrambling is called a DCI, and the CRC check obtaining is called the first CRC check;
If the first CRC check mistake, thinks verification unsuccessfully and process ends; Otherwise, further adopt the second length to carry out rate de-matching to the data that read, Viterbi decoding, and then will obtain data and carry out RNTI descrambling and CRC check, the Downlink Control Information DCI wherein obtaining after RNTI descrambling is called the 2nd DCI, and the CRC check obtaining is called the second CRC check;
If the second CRC check mistake, thinks verification unsuccessfully and process ends; Otherwise, further judge that whether a DCI is identical with the 2nd DCI; If a DCI is different with the 2nd DCI, think verification unsuccessfully and process ends; If identical, think and verification succeeds receive data process ends.
Preferably, described the first length is the acquiescence rate de-matching length L that CCE set class L is corresponding
x, according to set class L=1/2/4/8, corresponding default-length L respectively
x=72/144/288/576.
Preferably, described the second length is adaptive de rate-matched length L
y, self adaptation length L
yspan be [(L
dci+ 16), L
x], wherein L
dcifor current blind check DCI length, L
xfor acquiescence rate de-matching length corresponding to current C CE set class L.
Preferably, self adaptation length L
yfor span [(L
dci+ 16), L
x] interior determined value.
Preferably, self adaptation length L
yfor meeting the variable value in span.
Preferably, self adaptation length L
ywith UE, measure signal to noise ratio snr variation and change, its rule is: with SNR, raise and reduce, until minimum value (L
dci+ 16); With SNR, reduce and increase, until maximum L
x.
As can be seen from the above technical solutions, if the final CRC check failure of default-length rate de-matching or self adaptation length rate de-matching all thinks that verification is failed; Even and both equal CRC check are successful, also need to verify that whether the DCI that both obtain is identical, only in the situation that DCI is identical, just think verification succeeds, compared with conventional PDCCH blind check flow process of the prior art, average detected number of times can increase once, and probability of false detection can be greatly improved, simultaneously because combination blind check requires stricter than conventional blind check, be conducive to improve PDCCH and detect accuracy, reduce PDCCH flase drop risk.
Accompanying drawing explanation
Fig. 1 is PDCCH blind check schematic flow sheet of the prior art;
The PDCCH blind check schematic flow sheet that Fig. 2 provides for the embodiment of the present application.
Embodiment
The problem that the application exists for existing PDCCH blind check process, by the mode of combination blind check, adopt at least two kinds of length to carry out rate de-matching, by balance PDCCH detection threshold, false dismissal probability, probability of false detection, average detected number of times and the maximum relation that detects the indexs such as number of times, improve on the whole PDCCH and detect accuracy, reduce PDCCH flase drop risk.
For making know-why, feature and the technique effect of present techniques scheme clearer, below in conjunction with specific embodiment, present techniques scheme is described in detail.
Present techniques scheme is improved for the step 103 in the PDCCH blind check flow process of prior art shown in Fig. 1, and the step 103 after improvement as shown in Figure 2, comprises the steps:
Step 103-1: read CCEs in the original position of corresponding search volume according to CCE set class L.
Step 103-2: adopt the first length to carry out rate de-matching to the data that read, Viterbi decoding, and then will obtain data and carry out Radio Network Temporary Identifier RNTI descrambling and cyclic redundancy check (CRC) code CRC check, the Downlink Control Information DCI wherein obtaining after RNTI descrambling is called a DCI, and the CRC check obtaining is called the first CRC check.
Step 103-3: judge that whether the first CRC check is correct, if so, perform step 103-4, otherwise think that verification is failed, goes to step 105.
Step 103-4: adopt the second length to carry out rate de-matching to the data that read, Viterbi decoding, and then will obtain data and carry out RNTI descrambling and CRC check, the Downlink Control Information DCI wherein obtaining after RNTI descrambling is called the 2nd DCI, and the CRC check obtaining is called the second CRC check.
Step 103-5: judge that whether the second CRC check is correct, if so, perform step 103-6, otherwise think that verification is failed, goes to step 105.
Step 103-6: judge that whether a DCI is identical with the 2nd DCI, if so, performs step 103-7; Otherwise, think that verification unsuccessfully goes to step 105.
Step 103-7: think and verification succeeds receive data process ends.
Preferably, the first length is the acquiescence rate de-matching length L that CCE set class L is corresponding
x, according to set class L=1/2/4/8, corresponding default-length L respectively
x=72/144/288/576.
Preferably, the second length is adaptive de rate-matched length L
y, self adaptation length L
yspan be [(L
dci+ 16), L
x], wherein L
dcifor current blind check DCI length, L
xfor acquiescence rate de-matching length corresponding to current C CE set class L.
The embodiment of the present application provides several definite L
ymethod:
(1) self adaptation length L
yfor span [(L
dci+ 16), L
x] interior determined value, determined value can be configured to maximum L
x, or be configured to minimum value (L
dci+ 16), or be configured to other medians.For example, can adopt following formula to determine L
yvalue: L
y={ (L
dci+ 16)+(L
x)/2;
(2) self adaptation length L
yfor meeting the variable value in span, with UE, to measure signal to noise ratio snr variation and change, its rule is: with SNR, raise and reduce, until minimum value (L
dci+ 16); With SNR, reduce and increase, until maximum L
x.
Above-mentioned two kinds of methods are only for example, and are not used in present techniques scheme is limited.
From above flow process, can find out, if the final CRC check failure of default-length rate de-matching or self adaptation length rate de-matching all thinks that verification is failed; Even and both equal CRC check successes also need to verify that whether the DCI that both obtain identical, only in the situation that DCI is identical, just think verification succeeds, thereby avoided the flase drop causing because of accidental crc error.
The foregoing is only the application's preferred embodiment; not in order to limit the application's protection range; all within the spirit and principle of present techniques scheme, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.
Claims (6)
1. a method for Physical Downlink Control Channel blind check, is characterized in that, comprising:
According to control channel Elements C CE set class L, in the original position of corresponding search volume, read CCEs;
Adopt the first length to carry out rate de-matching to the data that read, Viterbi decoding, and then will obtain data and carry out Radio Network Temporary Identifier RNTI descrambling and cyclic redundancy check (CRC) code CRC check, the Downlink Control Information DCI wherein obtaining after RNTI descrambling is called a DCI, and the CRC check obtaining is called the first CRC check;
If the first CRC check mistake, thinks verification unsuccessfully and process ends; Otherwise, further adopt the second length to carry out rate de-matching to the data that read, Viterbi decoding, and then will obtain data and carry out RNTI descrambling and CRC check, the Downlink Control Information DCI wherein obtaining after RNTI descrambling is called the 2nd DCI, and the CRC check obtaining is called the second CRC check;
If the second CRC check mistake, thinks verification unsuccessfully and process ends; Otherwise, further judge that whether a DCI is identical with the 2nd DCI; If a DCI is different with the 2nd DCI, think verification unsuccessfully and process ends; If identical, think and verification succeeds receive data process ends.
2. method according to claim 1, is characterized in that, described the first length is the acquiescence rate de-matching length L that CCE set class L is corresponding
x, according to set class L=1/2/4/8, corresponding default-length L respectively
x=72/144/288/576.
3. method according to claim 1, is characterized in that, described the second length is adaptive de rate-matched length L
y, self adaptation length L
yspan be [(L
dci+ 16), L
x], wherein L
dcifor current blind check DCI length, L
xfor acquiescence rate de-matching length corresponding to current C CE set class L.
4. method according to claim 3, is characterized in that, self adaptation length L
yfor span [(L
dci+ 16), L
x] interior determined value.
5. method according to claim 3, is characterized in that, self adaptation length L
yfor meeting the variable value in span.
6. method according to claim 5, is characterized in that, self adaptation length L
ywith UE, measure signal to noise ratio snr variation and change, its rule is: with SNR, raise and reduce, until minimum value (L
dci+ 16); With SNR, reduce and increase, until maximum L
x.
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| WO2016095488A1 (en) * | 2014-12-15 | 2016-06-23 | 深圳市中兴微电子技术有限公司 | False detection control information recognition method, device, and storage medium |
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| WO2018145258A1 (en) * | 2017-02-08 | 2018-08-16 | 南通朗恒通信技术有限公司 | Terminal for dynamic scheduling, and method and apparatus in base station |
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| CN109964437B (en) * | 2017-02-08 | 2021-07-27 | 上海朗帛通信技术有限公司 | Method and device for dynamically scheduling terminal and base station |
| CN111066267A (en) * | 2017-09-29 | 2020-04-24 | 华为技术有限公司 | Method and apparatus for encoding downlink control information in a communication network |
| CN111066267B (en) * | 2017-09-29 | 2021-10-15 | 华为技术有限公司 | Method and apparatus for encoding downlink control information in a communication network |
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| CN108039940A (en) * | 2017-11-24 | 2018-05-15 | 天津大学 | A kind of invalid CCE elimination methods of LTE system PDCCH |
| CN111758230A (en) * | 2018-07-27 | 2020-10-09 | 华为技术有限公司 | Method and device for signal transmission |
| CN109196798A (en) * | 2018-08-31 | 2019-01-11 | 北京小米移动软件有限公司 | Detect the householder method and device of Physical Downlink Control Channel |
| CN109196798B (en) * | 2018-08-31 | 2021-11-09 | 北京小米移动软件有限公司 | Auxiliary method and device for detecting physical downlink control channel |
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