CN103297195B - A kind of method improving blind check efficiency for TD-LTE system - Google Patents
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Abstract
The present invention discloses a kind of method improving blind check efficiency for TD LTE system, utilize the polyisomenism that data occur when transmitting terminal rate-matched, slip auto-correlation is utilized in receiving end, estimate the original position of its multiplexing, according to probability, Candidate Set is arranged, carries out blind check successively, improve the accuracy of blind check.The blind check set of two kinds of big degree of polymerization is merged, decreases maximum blind check number of times.At the same time can be when two search volumes, the correlation of public search space first makes decisions and calculates, improves the speed of blind check.The present invention can be effectively improved the efficiency of blind check, it is provided that a kind of method of more quickly blind check.
Description
Technical field
The present invention relates to mobile communication technology field, be specifically related to third generation mobile communication long-term evolution system (TD-
LTE).
Background technology
In recent years, while legacy cellular mobile communication technology high speed development, wireless access wide band technology, such as movement
WiMAX (Worldwide Interoperability for Microwave Access, WiMAX) also begins to provide mobile merit
Can, it is intended to seize the market segment of mobile communication.In order to ensure the sustained competitiveness of 3G mobile communication, mobile communication industry proposes
The new market demand, it is desirable to strengthen 3G technology further, and HSPA(High Speed Packet Access of the same period)
Technology is in a disadvantageous position compared with WiMAX the most to a certain extent, has been basically completed LTE for this present situation 3GPP 2009
(Long Term Evolution)) R8 version, and based on this version, several years thereafter are constantly improved and upgrading.From length
Access technology before LTE gradually will replace in following several years from the point of view of far, becomes mainstream technology.
In LTE standard, the protocol architecture of wave point is similar to technology before, maintains the macrostructure on three layers of two sides.
In physical layer, adding some functions, such as transmission classification, wave beam forming, multiple-input, multiple-output (MIMO) process etc., in order to mate improvement
Some functions, the physical channel in LTE also there occurs that some change.PDCCH(Physical Downlink Control
Channel) as in physical layer down physical channel, it is used for carrying DCI(Downlink Control
Information) information, comprises the resource distribution on one or more UE and other control information.Up-downgoing in LTE
Resource scheduling information (information of MCS, Resource allocation etc.) is all carried by PDCCH.In general,
In a subframe, can there is multiple PDCCH.UE needs the DCI first demodulating in PDCCH, then can be in corresponding money
On source position, demodulation belongs to the PDSCH(of UE oneself and includes broadcast, paging, the data etc. of UE).But, terminal is come
Saying, receiving PDCCH is but a relatively cumbersome thing, because what information what terminal do not knew that current PDCCH transmits is, the most not
Know that oneself information needed is where, it is therefore necessary to take the mode of blind check.If PDCCH all of in system is carried out
Monitor, be infeasible for the complexity angle of terminal, it is therefore necessary to take effective mechanism to limit blind check number of times, carry
High efficiency, the response speed for whole system is raced against time.
The blind detection method being currently used in LTE system is the most immature, is broadly divided into two big classes: a class is just calculated for traditional blind check
Method, is similar to the method for exhaustion, and i.e. terminal is according to required DCI(Downlink Control Information) information judges it
Corresponding PDCCH all possible multiplexing position (multiplexing position is relevant with search volume and polymerization grade L), opens from first
Beginning, attempt successively, until solving required information, or having retrieved all of probability.Another Blind Algorithm,
I.e. according to front blind check achievement several times, some positional informationes preserved, to corresponding polymerization grade L, carry out preferential blind check,
This method make use of transmitting terminal base station to determine the characteristic of corresponding polymerization grade according to channel quality.So at short notice
When channel quality does not occur the biggest change, the method is feasible, but excessively poor at channel quality, or channel quality condition change
Time frequently, for reducing the help of blind check number of times very limited.And for terminal, we can not be with average blind check number of times
Estimate the performance of Blind Algorithm, because blind check number of times can float to maximum blind check number of times for 1 time 44 times from minimum blind check number of times.
And for terminal, blind check each time will be experienced substantial amounts of double counting and just be able to verify that the successful of blind check.At algorithm not
In the case of the best, maximum blind check number of times may be frequently occurred, or frequently occur the blind check feelings close to maximum blind check number of times
Condition, this can bring great time delay to whole system, also bring bad experience to user simultaneously.So existing TD-LTE system
The one that needs system can fundamentally reduce maximum blind check number of times, improves the algorithm of blind check efficiency.
Summary of the invention
The present invention is directed to the drawbacks described above that prior art exists, propose a kind of passing through needing blind check for TD-LTE system
Information carry out pretreatment thus reduce maximum blind check number of times, the method simultaneously increasing blind check efficiency.
The present invention solves above-mentioned technical problem and be the technical scheme is that proposition is a kind of for LTE system raising blind check
The method of efficiency, including step: according to receiving terminal information wireless network temporary mark RTNI, (1) determines that search volume, extraction are searched
Data in rope space and corresponding carrying DCI message length, determine from corresponding search volume according to the length of DCI information
The data length of middle intercepting；(2) according to the length of DCI, the data in search volume are carried out slip related operation, draw relevant
Result；(3) make decisions and blind check according to dissimilar search volume according to correlated results.
The described search volume determined includes: public search space, user's dedicated search space, public search space and use
Dedicated search space, family exists simultaneously；Data in search volume are controlled according to maximum length L of channel element CCESEARCHCarry
Fetch data, if search volume is public search space and user's dedicated search space exists simultaneously, then first from public search space
Extract data, then from user's dedicated search spatial extraction data.Length L according to DCI informationdciDetermine from corresponding search volume
The data length of middle intercepting, according to formula Lcorr=3* (Ldci+ 16) DCI format information is calculated through interpolation CRC check bit, volume
Length L after long-pending codingcorr, the data length of described intercepting is 2Lcorr.Data are carried out slip related operation specifically include: from phase
The a length of 2L of data intercept in the search volume answeredcorrData, intercepting the data that obtain is
Data intercept hour offset 4 controls channel element CCE next time, and skew number of times is designated as m；Before and after the data of intercepting are fetched data
LcorrPosition carries out related operation, according to formula:Calculate each starting point corresponding
Correlation, this correlation d (m) is correlated results, wherein, LcorrLength after encoding for DCI format information, m is skew
Number of times, M(i+288·m)For the data being truncated to, i gets L from 0corr。
Correlated results combines search volume make decisions and blind check, specifically includes:
If public search space, by correlated results corresponding for each original position, enter according to descending order
Row arrangement, take original position intercept data:Being deinterleaved successively, viterbi translates
Code, CRC check, if all CRC check is correct, then blind check terminates, if CRC check mistake, blind check failure.
If user's dedicated search space, the correlated results corresponding when each original position is less than thresholding, uses tradition side
Person ignorant of the law examines polymerization grade 1 and the search volume of polymerization grade 2；If correlated results corresponding to each original position is higher than thresholding,
Then above-mentioned correlated results is arranged according to descending order, take the data that original position intercepts
Being deinterleaved successively, viterbi decodes, CRC check, if complete verification is correct, then blind check terminates, if check errors.
Exist if public search space and user's dedicated search space simultaneously, first take public search space and search
Rope, if correlation corresponding to each original position is less than thresholding, then proceeds to user's dedicated search space search；If it is each
Correlation corresponding for each starting point higher than thresholding, is then carried out by correlation corresponding to individual original position according to descending order
Arrangement, takes the data that original position interceptsBeing deinterleaved successively, viterbi decodes,
CRC check, if complete verification is correct, then blind check terminates, if check errors, then proceeds to user's dedicated search space search.
The present invention can effectively reduce the number of times of blind check, arranges according to probability for part searches space, successively
Carry out blind check, as maximum blind check number of times can be reduced, and blind check efficiency can be improved, fundamentally reduce maximum blind check number of times, fall
Low Time Delay of Systems.
Accompanying drawing explanation
The frame structure schematic diagram of frame structure type 2 in Fig. 1 TD-LTE system；
In Fig. 2 TD-LTE system, PSS signal is at the feature schematic diagram of frequency domain；
Fig. 3 TD-LTE system uses detection frequency-region signal power to estimate the method flow diagram of integer frequency offset；
Fig. 4 TD-LTE system uses the blind check optimized algorithm flow chart to multiplex section pretreatment.
Detailed description of the invention
Referring to the drawings, the preferred embodiments of the present invention are described in detail.
The present invention proposes a kind of method improving blind check efficiency for LTE system, utilizes data in transmitting terminal speed
The polyisomenism that timing occurs, utilizes slip auto-correlation in receiving end, estimates the original position of its multiplexing, and this algorithm efficiently reduces
Maximum blind check number of times, simultaneously according to probability, arranges for Candidate Set, is better than conventional exhaust algorithm；True at receiving terminal
After having determined DCI message length and search volume, calculate the length of intercepting, from search volume, take out the data of corresponding length,
And data are carried out isometric blocking, and front and back data will carry out correlation computations, purpose is contemplated to judge, if having in rate-matched
Repeated segments occur, if there being repeated segments to occur, be original position the most herein.Owing at transmitting terminal, the information according to upper strata,
Select different search volumes, relatively big due to polymerization grade when public search space, there will be repetition when rate-matched,
During dedicated search space, polymerization grade there will be repetition when 4 and 8, does not then have repetition when polymerization grade is 1 and 2,
So can only be 4 and 8 to be optimized polymerization grade, a threshold value the most in the light of actual conditions can be taken out, at correlation
During less than thresholding, the most not repeating, getting rid of polymerization grade is the situation of 4 and 8, is only 1 and 2 two kind of situation to polymerization grade
Carry out blind check.Above calculating and judgement are that the data received carry out the pretreatment of little amount of calculation, according to the knot of pretreatment
Really, the Candidate Set needing judgement is carried out arrangement according to probability height and carries out blind check, improve blind check efficiency, pledge love one simultaneously
Under condition, it is also possible to according to the result of pretreatment, get rid of impossible situation, fundamentally reduce blind check number of times.
The present invention relies on the data structure after LTE transmitting terminal rate-matched, during with transmitting terminal overall flow and rate-matched
The repeated segments occurred is closely related, understands for convenience, before describing LTE system blind check optimized algorithm, first to transmission
After end overall flow and rate-matched, the feature of data carries out brief description.
According to 3GPP TS36.211 and 3GPP TS36.211.We can obtain transmitting terminal overall flow and see Fig. 1.Its
In we mainly discuss is the flow chart of data processing of Rate Matching block.
In 3GPP TS36.211, define PDCCH(Physical Downlink Control Channel) rate-matched mode, at 3GPP
In TS36.212, define the multiplexing rule of PDCCH.Understand in conjunction with both, after rate-matched, when polymerization grade is 1
Wait, the cascaded message after interweaving can be punched, may have a little duplicate message when polymerization grade is 2, the ratio of repetition
Special number is that PDCCH bit number deducts length after tail biting convolutional encoding.Polymerization grade is to occur in that complete repeated segments when 4, polymerization
Grade is to have substantial amounts of repeated segments to occur when 8, sees Fig. 2.
Owing to when polymerization grade is 4 and 8, having complete repeated segments to occur, we are in upper figure during polymerization grade L=4
PDCCH multiplex section carries out sliding and is correlated with.The step-length every time slided is 4 CCE.Owing to there being the existence of repeated segments, in normal place
Correlation window is to have good peak value during two repeated segments.Because DCI information is carrying out CRC scrambling, tail biting convolutional encoding and
There is after intertexture certain randomness, meanwhile, in the CCE not having PDCCH information, the value that can specify using Luo Deyuan as
NILL bit is filled with, it is to avoid the phenomenon of full 0.
Here carry out explaining in order to help reader to understand with the structure of PDCCH multiplex section of making a start.Owing to connecing
Receiving end is the inverse process made a start, and the flow process of receiving terminal sees Fig. 3, demodulates at receiving terminal, and after descrambling, what we obtained is and Fig. 2
Similar multiplex section, according to the difference of demodulation mode, under hard demodulation, can obtain bit stream, and under soft demodulation, obtain 0 and 1
Between Soft Inform ation.But whether be which kind of demodulation mode, after descrambling, PDCCH multiplexed information at polymerization grade L=4,8
In the case of remained in that this character i.e. has certain correlation peak.Then, we are after calculating original position, to searching
Information in rope space carries out pretreatment, the selection certain according to correlation peak and sequence, thus improves the accuracy of blind check, subtracts
The number of times of few blind check.
By to needing the data carrying out blind check to be analyzed, we have obtained some characteristics, it is possible to utilize these special
Property make decisions, according to judgement result, we can to the data of blind check according to probability height be ranked up, it is possible to have
Effect reduces maximum blind check number of times.
The method specifically includes following steps:
(1) determine, according to the information required for receiving terminal, the data extracting in search volume and to calculate correlation window long
Degree.Specifically can adopt with the following method:
A) search volume and corresponding holding are determined according to information RTNI (Radio Network Temporary Identifier) needed for receiving terminal
Carry DCI format information.Wherein search volume one has three kinds of probabilities, and respectively: public search space, user's dedicated search is empty
Between, public search space and user's dedicated search space exist simultaneously.
B) by the data of search volume that determine according to the length of maximum CCE (control channel element) search volume
LSEARCHExtracting data, its data set is M, if both can be public search space and user's dedicated search space simultaneously, then first
Take public search space.Data intercept total length is LSEARCH=CCEs*LCCE, CCEs=16,.Wherein LSEARCHFor extracting data
Length, CCEs be intercept CCE quantity, LCCEIt is the bit number shared by a CCE, LCCE=72.If there being two search
Space i.e. public search space and user's dedicated search space exist simultaneously, the most first take public search space, then it is special to take family
Search volume data, are designated as M1 and M2 and calculate successively.
C) according to length L of DCI informationdci, call formula Lcorr=3* (Ldci+ 16) calculate from corresponding search volume
The required message length intercepted, wherein, LcorrAccording to the DCI information that determines, the DCI format information calculated is through adding
CRC check bit, the length after convolutional encoding.
(2) according to the length of DCI after the coding determined, the data in search volume are carried out slip to be correlated with.Concrete employing is such as
Lower method:
A) to the data in data set M according to 2LcorrLength intercept, intercepting the data that obtain isBe 4 due to related algorithm mainly for polymerization grade and 8 two kind of situation is optimized, because of
It is 4 that this skew measures both common divisors, and the data hour offset amount in M that next time intercepts is 4 i.e. 288bit of CCE.Skew number of times
It is designated as m.
B) L before and after the data being truncated to being fetched datacorrPosition carries out related operation.The correlation that each starting point is corresponding
For: according to formulaDetermining, wherein d (m) is correlated results, M(i+288·m)For
The data being truncated to, i gets L from 0corr, LcorrLength after encoding for DCI format information, m is the number of times of skew.
(3) carry out relevant result processing reducing blind check number of times.Specifically adopt with the following method:
A) because if CCEs is 16, can only offset altogether 3 times, totally 4 results, then correlated results d (m) of gained is d
(0),d(1),d(2),d(3).It is arranged according to descending order.Take its corresponding original position to intercept:Being deinterleaved successively, viterbi decodes, CRC check.If verification is correct, then blind check
Terminate.If check errors, then judging its search volume, if public search space, then blind check failure, special if user
With search volume, then take out the special data searched in element space of user.If not only can public search space but also can with
Dedicated search space, family, then extract the data in user's dedicated search space and carry out above-mentioned judgement and process again, if two
The all process of individual search volume terminate, then take out the special data searched in element space of user.
B) not obtaining the result of blind check due to above-mentioned judgement and calculating, having eliminated polymerization grade is 4 and 8
Two kinds of situations.By the data taken out according to traditional algorithm, with remaining polymerization grade L=1,2, data are carried out blind check, until blind
Inspection is correct, or has retrieved all of Candidate Set.Now maximum blind check number of times is 12 times, and i.e. retrieving polymerization grade is 2
Later Candidate Set.
Fig. 4 show TD-LTE system and uses the blind check optimized algorithm flow chart to multiplex section pretreatment.Specifically include as
Lower step:
1) after receiving terminal descrambles, blind check circulation is initially entered；
2) the DCI information expected according to terminal, determines the RNTI for CRC descrambling, according to RNTI and the transmission mould of table 1
Formula determines the DCI format wanting blind check corresponding to CCEs search volume and this RNTI with the relation of DCI format；
The relation table of table 1 RNTI and transmission mode and DCI format
3) according to length L of DCI formatdci, can be according to formula Lcorr=3* (Ldci+ 16) L is calculatedcorr, it is thus achieved that to searching
Length 2L of rope space data interceptcorr,；
4) from the beginning of the original position of corresponding search volume, owing to agreement specifies maximum search scope under each polymerization grade
Being 16 CCE, the data therefore taking out 16 CCE carry out pretreatment according to below step；
5) according to 2LcorrLength intercept the data in 16 CCE taken out, intercepting the data that obtain isIntercept 4 i.e. 288bit of CCE of data hour offset in M next time.Skew number of times is designated as m；
6) data being truncated to are taken before and after LcorrPosition carries out related operation.According to formula:
Calculating the correlation that each original position is corresponding, correlation d (m) is correlated results, wherein, and M(i+288·m)For be truncated to
Data, i gets L from 0corr, LcorrLength after encoding for DCI format information, m is the number of times of skew；
Such as: d (0), 7) correlated results (d (1), d (2), d (3)) is arranged according to descending order.Take start bit
Put the data of intercepting:Being deinterleaved successively, viterbi decodes, CRC check.If school
Test correct, then blind check terminates.If check errors, then judging its search volume, if public search space, then blind check is lost
Lose, if user's dedicated search space, then take out the special data searched in element space of user and enter next step.If it is the most permissible
Again can be in user's dedicated search space at public search space, then it represents that the information of needs is not in public search space, heavy
New 16 the CCE data calculated in its dedicated search space, then carry out above-mentioned judgement and process, if two search volume Dou Chu
Reason terminates, then take out the special data searched in element space of user and enter next step；
8) by the data taken out according to traditional algorithm, with remaining polymerization grade L=1,2 and corresponding DCI length institute really
Fixed remaining possible set.Data are carried out blind check circulation, until blind check is correct, or retrieves all of Candidate Set；
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, hence it is evident that, those skilled in the art
Member can carry out various change and modification without departing from the spirit and scope of the present invention to the present invention.So, if the present invention
These amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these
Change and including modification.
Claims (4)
1. one kind for LTE system improve blind check efficiency method, it is characterised in that: (1) according to the information needed for receiving terminal without
Line Network Temporary Identifier RNTI determines search volume and corresponding carrying DCI information, extracts the data in search volume and institute
Corresponding carrying DCI message length, wherein, the data set of extracted data is M, determines from accordingly according to the length of DCI information
Search volume in intercept data length；(2) according to the length of DCI information after the coding determined to the data in search volume
Carry out slip related operation, draw correlated results, data are carried out slip related operation and specifically includes: from corresponding search volume
In data set M in a length of 2L of data interceptcorrData, intercepting the data that obtain is
Data intercept hour offset 4 controls channel element CCE next time, and skew number of times is designated as m；Before and after the data of intercepting are fetched data
LcorrPosition carries out related operation, according to formula:Calculate each original position corresponding
Correlated results d (m), wherein, LcorrFor DCI information through adding CRC check bit, the length after convolutional encoding, m is skew
Number of times, M(i+288·m)For the data being truncated to, i gets L from 0corr；(3) above-mentioned correlated results is entered according to descending order
Row arrangement, takes the data that original position interceptsBeing deinterleaved successively, viterbi decodes,
CRC check, if verification is correct, then blind check terminates；If check errors, then judge its search volume, if common search
Space, then blind check failure, if user's dedicated search space, then take out the data in user's dedicated search space；If both
Then the data in user's dedicated search space can be extracted in user's dedicated search space again at public search space
Carry out above-mentioned judgement and process again, if two search volume all process terminate, then take out the number in user's dedicated search space
According to；By the data taken out according to traditional algorithm, with remaining polymerization grade L=1,2 and corresponding DCI message length determined
Remaining may set, the data taken out are carried out blind check circulation, until blind check is correct, or have retrieved all of candidate
Collection.
Method the most according to claim 1, it is characterised in that: the described search volume determined includes: public search space,
User's dedicated search space, public search space and user's dedicated search space exist simultaneously；Data in search volume are pressed
Length L of channel element CCE is controlled according to maximumSEARCHExtract data, if search volume be public search space and user special
Search volume exists simultaneously, then first extract data from public search space, then from user's dedicated search spatial extraction data.
Method the most according to claim 1, it is characterised in that: according to formula Lcorr=3* (Ldci+ 16) DCI information warp is calculated
Cross interpolation CRC check bit, length L after convolutional encodingcorr, the data length of described intercepting is 2Lcorr, wherein, LdciFor DCI
The length of information.
Method the most according to claim 2, it is characterised in that: if search volume be public search space and user special
Search volume exists simultaneously, first scans for from public search space, if correlated results corresponding to each original position is low
In thresholding, then proceed to user's dedicated search space search；If correlated results corresponding to each original position is higher than thresholding, then
Correlated results corresponding for each original position is arranged according to descending order, takes the data that original position interceptsBeing deinterleaved successively, viterbi decodes, CRC check, if complete verification is correct, then
Blind check terminates, if check errors, then proceeds to user's dedicated search space search.
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| CN201310242917.8A CN103297195B (en) | 2013-06-18 | A kind of method improving blind check efficiency for TD-LTE system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102056185A (en) * | 2009-10-31 | 2011-05-11 | 华为技术有限公司 | Channel blind detection method, channel assignment method and device |
| CN102255688A (en) * | 2011-07-06 | 2011-11-23 | 合肥东芯通信股份有限公司 | LTEPDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102056185A (en) * | 2009-10-31 | 2011-05-11 | 华为技术有限公司 | Channel blind detection method, channel assignment method and device |
| CN102255688A (en) * | 2011-07-06 | 2011-11-23 | 合肥东芯通信股份有限公司 | LTEPDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device |
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| Title |
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| 一种LTE系统中减少PDCCH盲检次数的方法;李小文，贾海峰;《电子技术应用》;20120430;第38卷(第4期);第87-89页 * |
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