CN103731236B - Blind detection method for physical downlink control channel - Google Patents
Blind detection method for physical downlink control channel Download PDFInfo
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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 is related to mobile communication technology field, particularly to Long Term Evolution project (lte, long
Termevolution)/lte-a system, more particularly, to a kind of Physical Downlink Control Channel (pdcch, physical
Downlinkcontrol channel) blind check method.
Background technology
Pdcch in 3gpp lte/lte-a system carries various types of Downlink Control Information.Base station is according to user
The actual channel condition of equipment (ue), by distributing different running time-frequency resources, using rational modulating-coding, control information is sent out
Give ue.Ue does not generally know the control channel element (cce, control channel elements) that current pdcch takies
Number size, transmission be what Downlink Control Information (dci, downlink control information) form letter
Breath, does not know the information oneself needing in which position yet.But ue knows what information oneself is currently expecting, such as in sky
The information that not busy (idle) state ue is expected is paging, si；It is contemplated that RACH (rach) should after initiating Stochastic accessing
Answer, expect ulgrant etc. when having upstream data etc. to be sent.For the different corresponding wireless networks of expectation information ue
Network temporary mark (rnti) goes to do CRC (crc, cyclic redundancy check) verification with cce information,
If crc verifies successfully, then ue is known that this information is that oneself needs it is also possible to be further known to corresponding dci lattice
Formula, modulation system, thus solve dci content.Here it is so-called blind check process.
If ue is searched for over successively according to the order of cce, then the amount of calculation of ue side is appreciable, especially right
Larger in bandwidth ratio, the more systems of cce number, therefore, the quality of blind check efficiency and the data processing amount of system and reaction
The characteristics such as time have very big contact, and blind check efficiency is higher, and systematic function is more superior.Ue is by way of pdcch blind check
(different cce set, few detection number of times of trying one's best in different search spaces and statistical significance) receives Downlink Control Information,
All kinds of dci flase drops should be prevented, ensure rational detection threshold again, reduce false dismissal probability.
In prior art, pdcch blind check process includes:
Step 101: row subframe in each of the lower, ue detects to control zone ofdm symbol, carries out solution to pdcch channel and reflects
Penetrate, demodulation descrambles, the data after descrambling is as the input data of blind check.
Step 102: calculate current search original position.
Step 103: cces is read according to the original position in corresponding search space for the cce set class l, the number that will read
According to carrying out solving rate-matched, Viterbi (viterbi) decoding, then will obtain data again and carry out rnti descrambling and crc verification.
Step 104: if verifying successfully, receiving data process ends；Otherwise, abandon this time searching for, continue to hold
Row step 105；
Step 105: judge whether to have searched for all of candidate pdcchs in current spatial, if it is not, search original position adds
L, return to step 103 is searched for next time；If so, execution step 106.
Step 106: judge whether the complete all set classes of blind check, if so, blind check terminates, otherwise, enter next set etc.
Level return to step 102.
Pdcch blind check process of the prior art has a disadvantage in that
(1), the probability of false detection that different rnti descramblings exist, such as base station is sent to one dci of certain user, due to the change of channel
Change the interference with noise, other users adopt different rnti blind checks it is also possible to crc verification is correct.
(2), different length dci solves the probability of false detection that rate-matched introduces, and such as base station is sent to one dci of certain user, by
In the change of channel and the interference of noise, this user's blind check may parse the dci of multiple different lengths, and crc just verifies
Really.
(3), the probability of miscarriage of justice that in low signal-to-noise ratio environment, 16bit crc verifies, as certain user due to the change of channel and makes an uproar
The interference of sound, blind check result is it is also possible to crc verification is correct, and parses the dci that base station does not send.
Content of the invention
This application provides a kind of method of Physical Downlink Control Channel blind check, probability of false detection can be reduced.
A kind of method of Physical Downlink Control Channel blind check that the embodiment of the present application provides, comprising:
Cces is read according to the original position in corresponding search space for the control channel element cce set class l；
Using the first length, the data reading is carried out solving rate-matched, viterbi decodes, and then will obtain data again and enter
Row Radio Network Temporary Identifier rnti descrambling and CRC crc verification, the descending control obtaining after wherein rnti descrambling
Information dci processed is referred to as a dci, crc verification the referred to as the crc verification obtaining；
If crc check errors are then it is assumed that verify unsuccessfully and process ends；Otherwise, adopt the second length further
The data reading is carried out solving rate-matched, viterbi decodes, then will obtain data again and carry out rnti descrambling and crc verification,
The Downlink Control Information dci obtaining after wherein rnti descrambling is referred to as the 2nd dci, crc verification the referred to as the 2nd crc verification obtaining；
If the 2nd crc check errors are then it is assumed that verify unsuccessfully and process ends；Otherwise, determine whether a dci and
Whether the 2nd dci is identical；If a dci and the 2nd dci different then it is assumed that verify unsuccessfully simultaneously process ends；If identical, recognize
For verifying successfully, receiving data process ends.
It is preferred that described first length is cce set class l, corresponding acquiescence solves rate-matched length lx, according to set
Grade l=1/2/4/8, corresponds to default-length l respectivelyx=72/144/288/576.
It is preferred that described second length is adaptive de rate-matched length ly, adaptive-length lySpan be
[(ldci+16),lx], wherein ldciFor current blind check dci length, lxFor current cce set class l corresponding acquiescence solution speed
Join length.
It is preferred that adaptive-length lyFor span [(ldci+16),lx] in determination value.
It is preferred that adaptive-length lyFor meeting the variable value in span.
It is preferred that adaptive-length lyChange with ue measurement signal to noise ratio snr change, its rule is: raises with snr and subtracts
Little, until minima (ldci+16)；Reduce with snr and increase, until maximum lx.
As can be seen from the above technical solutions, if default-length solution rate-matched or adaptive-length solution rate-matched
Whole crc verifies unsuccessfully, all thinks and verifies unsuccessfully；Even and if both of which crc verifies successfully in addition it is also necessary to verify what both obtained
Whether dci is identical, only just thinks in the case of dci identical and verifies successfully, with routine pdcch blind check stream of the prior art
Journey is compared, and average detected number of times can increase once, and probability of false detection can be greatly improved, simultaneously because combination blind check is than conventional blind check
Require tightened up, be conducive to improving pdcch detection accuracy, reduce pdcch flase drop risk.
Brief description
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.
Specific embodiment
The application is directed to the problem that existing pdcch blind check process exists, and by way of combining blind check, adopts at least two
Length carries out solving rate-matched, by balancing pdcch detection threshold, false dismissal probability, probability of false detection, average detected number of times and maximum
The relation of the indexs such as detection number of times, improves pdcch detection accuracy on the whole, reduces pdcch flase drop risk.
Know-why, feature and technique effect for making technical scheme are clearer, below in conjunction with concrete reality
Apply example technical scheme is described in detail.
Technical scheme is primarily directed to step 103 in the pdcch blind check flow process of prior art shown in Fig. 1 in addition
Improve, the step 103 after improvement is as shown in Fig. 2 comprise the steps:
Step 103-1: cces is read according to the original position in corresponding search space for the cce set class l.
Step 103-2: using the first length, the data reading is carried out solving rate-matched, viterbi decodes, then again will
Obtain data and carry out Radio Network Temporary Identifier rnti descrambling and CRC crc verification, after wherein rnti descrambling
The Downlink Control Information dci arriving is referred to as a dci, crc verification the referred to as the crc verification obtaining.
Step 103-3: judge whether a crc verification is correct, if so, execution step 103-4, otherwise it is assumed that verification is lost
Lose, go to step 105.
Step 103-4: using the second length, the data reading is carried out solving rate-matched, viterbi decodes, then again will
Obtain data and carry out rnti descrambling and crc verification, the Downlink Control Information dci obtaining after wherein rnti descrambling is referred to as the 2nd dci,
Crc verification the referred to as the 2nd crc verification obtaining.
Step 103-5: judge whether the 2nd crc verification is correct, if so, execution step 103-6, otherwise it is assumed that verification is lost
Lose, go to step 105.
Step 103-6: judge whether a dci and the 2nd dci is identical, if so, execution step 103-7；Otherwise it is assumed that school
Test failure and go to step 105.
Step 103-7: think and verify successfully, then receiving data process ends.
It is preferred that the first length is cce set class l, corresponding acquiescence solves rate-matched length lx, according to set class l
=1/2/4/8, correspond to default-length l respectivelyx=72/144/288/576.
It is preferred that the second length is adaptive de rate-matched length ly, adaptive-length lySpan be [(ldci+
16),lx], wherein ldciFor current blind check dci length, lxFor current cce set class l corresponding acquiescence solution rate-matched length.
The embodiment of the present application provides several determination lyMethod:
(1) adaptive-length lyFor span [(ldci+16),lx] in determination value, determination value is configurable to maximum
Value lx, or it is configured to minima (ldci, or be configured to other intermediate values+16).It is for instance possible to use equation below is come really
Determine lyValue: ly={(ldci+16)+(lx)}/2;
(2) adaptive-length lyFor meeting the variable value in span, change with ue measurement signal to noise ratio snr change,
Its rule is: raises with snr and reduces, until minima (ldci+16)；Reduce with snr and increase, until maximum lx.
Above two method is for illustration only, and is not used to technical scheme is defined.
If can be seen that default-length solution rate-matched from above flow process or adaptive-length solution rate-matched being final
Crc verifies unsuccessfully, all thinks and verifies unsuccessfully；Even and if both of which crc verifies successfully in addition it is also necessary to the dci that both checkings obtain is
No identical, only just think in the case of dci identical and verify successfully, thus avoiding the flase drop leading to because of accidental crc error.
The foregoing is only the preferred embodiment of the application, not in order to limit the protection domain of the application, all
Within the spirit of technical scheme and principle, any modification, equivalent substitution and improvement done etc., should be included in this Shen
Within the scope of please protecting.
Claims (4)
1. a kind of method of Physical Downlink Control Channel blind check is it is characterised in that include:
Cces is read according to the original position in corresponding search space for the control channel element cce set class l；
Using the first length, the data reading is carried out solving rate-matched, viterbi decodes, then will obtain data again and carry out no
Line Network Temporary Identifier rnti descrambling and CRC crc verification, the descending control letter obtaining after wherein rnti descrambling
Breath dci is referred to as a dci, crc verification the referred to as the crc verification obtaining；
If crc check errors are then it is assumed that verify unsuccessfully and process ends；Otherwise, adopt the second length further to reading
The data taking carries out solving rate-matched, and viterbi decodes, and then will obtain data again and carry out rnti descrambling and crc verification, wherein
The Downlink Control Information dci obtaining after rnti descrambling is referred to as the 2nd dci, crc verification the referred to as the 2nd crc verification obtaining；
If the 2nd crc check errors are then it is assumed that verify unsuccessfully and process ends；Otherwise, determine whether a dci and second
Whether dci is identical；If a dci and the 2nd dci different then it is assumed that verify unsuccessfully simultaneously process ends；If identical then it is assumed that school
Test successfully, receiving data process ends；
Described first length is cce set class l corresponding acquiescence solution rate-matched length lx, according to set class l=1/2/4/
8, correspond to default-length l respectivelyx=72/144/288/576；
Described second length is adaptive de rate-matched length ly, adaptive-length lySpan be [(ldci+16),
lx], wherein ldciFor current blind check dci length, lxFor current cce set class l corresponding acquiescence solution rate-matched length.
2. method according to claim 1 is it is characterised in that adaptive-length lyFor span [(ldci+16),lx] in
Determination value.
3. method according to claim 1 is it is characterised in that adaptive-length lyFor meeting the variable value in span.
4. method according to claim 3 is it is characterised in that adaptive-length lyChange with ue measurement signal to noise ratio snr change
Become, its rule is: raise with snr and reduce, until minima (ldci+16)；Reduce with snr and increase, until maximum lx.
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| CN104683069B (en) * | 2015-02-13 | 2018-04-27 | 大唐联仪科技有限公司 | A kind of physical downlink control channel PDCCH blind checking method and system |
| 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 |
| EP3679668B1 (en) * | 2017-09-29 | 2022-04-06 | Huawei Technologies Co., Ltd. | Devices and methods for encoding downlink control information in a communication network |
| CN108039940B (en) * | 2017-11-24 | 2020-12-11 | 天津大学 | Invalid CCE (control channel element) removing method for PDCCH (physical downlink control channel) of LTE (long term evolution) system |
| CN111758230B (en) * | 2018-07-27 | 2022-02-08 | 华为技术有限公司 | Method and device for signal transmission |
| WO2020042170A1 (en) * | 2018-08-31 | 2020-03-05 | 北京小米移动软件有限公司 | Auxiliary method and apparatus for detecting physical downlink control channel |
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Address after: 100080 Putian Building, No. 6 North Second Street, Haidian District, Beijing Patentee after: POTEVIO INFORMATION TECHNOLOGY Co.,Ltd. Address before: 100080 6, two North Street, Haidian District, Beijing, Haidian Patentee before: PETEVIO INSTITUTE OF TECHNOLOGY Co.,Ltd. |