CN105763286A - Method and device for identifying wrong detection control information - Google Patents
Method and device for identifying wrong detection control information Download PDFInfo
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- CN105763286A CN105763286A CN201410776163.9A CN201410776163A CN105763286A CN 105763286 A CN105763286 A CN 105763286A CN 201410776163 A CN201410776163 A CN 201410776163A CN 105763286 A CN105763286 A CN 105763286A
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Abstract
The present invention discloses a method for identifying wrong detection control information. The method comprises a step of calculating the relative metric of the decoder path of downlink control information which passes checking, a step of obtaining the initial state and end state of a decoder survivor path and calculating the Hamming distance between the initial state and the end state, and a step of identifying the wrong detection control information according to the relative metric value and the size of a first preset threshold value and the Hamming distance and the size of a second preset threshold value. The invention also discloses a device for identifying wrong detection control information.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and device identifying that flase drop controls information.
Background technology
At Long Term Evolution (LongTermEvolution, LTE) in system, by downlink physical control channel (PhysicalDownlinkControlChannel, PDCCH) bearing downlink controls information (DownlinkControlInformation, DCI), DCI comprises the resource allocation information on one or more subscriber equipment (UserEquipment, UE) and other kinds of control information；PDCCH also carries schedule information and the uplink power control commands information of uplink/downlink data transmission, wherein, the schedule information of described uplink/downlink data transmission can distribute (Resourceallocation) information, modulation and coding strategy (ModulationandCodingScheme, MCS) etc. for resource.
Ordinary circumstance, multiple PDCCH can be had in one subframe of LTE system, UE is firstly the need of the DCI in demodulation PDCCH, then Physical Downlink Shared Channel (the PhysicalDownlinkSharedChannel belonging to UE oneself can be demodulated on corresponding resource location, PDSCH), described PDSCH carries the information such as the data of broadcast, paging, UE.
But, owing to DCI has multiple format, and before the DCI that UE is in demodulation PDCCH, in this case it is not apparent that the PDCCH received carries is the DCI of which kind of form, and therefore, the form of DCI must be carried out blind check by UE；That is, UE demodulates institute likely one's own PDCCH according to the form of the DCI used, and searches for one's own information；Therefore, the form of DCI being carried out blind check and there will be the situation of error detection, the PDCCH that namely UE demodulates not is one's own；The probability of false detection size of DCI is relevant with cyclic redundancy check (CRC) (CyclicalRedundancyCheck, CRC) bit length；The CRC of PDCCH is 16 bits, and the theoretical false drop rate of DCI is 1/65536；But, in actual wireless communications environment, by the impact of transmission channel, false drop rate is significantly greater than this value；As, in LTE system test process, DCIformat0 probability of false detection reaches 2 beats/min；The flase drop of DCI can cause that the Stochastic accessing of UE exception, UE send/receive unexpected data, down mixing self-retransmission request (HybridAutomaticRepeatRequest, HARQ) the unpredictable problem such as feedback error, UE ascending power exception adjustment, and then affect the performance of LTE system.
Summary of the invention
In view of this, embodiment of the present invention expectation provides a kind of method and device identifying that flase drop controls information, can effectively identify the flase drop of DCI, avoid the Stochastic accessing of UE exception, UE to send/receive the unpredictable problems such as unexpected data, HARQ feedback mistake, UE ascending power exception adjustment, improve the performance of LTE system.The technical scheme of the embodiment of the present invention is achieved in that
The embodiment of the present invention provides a kind of method identifying that flase drop controls information, and described method includes: calculating is by the relative degree value of the decoding path of the Downlink Control Information of verification；Obtain the initial state of decoding survivor path and terminate state, calculating the Hamming distance between described initial state and described termination state；Size according to described relative degree value with the first threshold value preset, and the size identification flase drop control information of described Hamming distance and the second default threshold value.
In above-mentioned implementation, described first threshold value comprises multiple threshold values that the degree of polymerization grade (Aggregation, AL) of control channel unit (ControlChannelElement, CCE) taken with PDCCH is relevant.
In above-mentioned implementation, the described size according to described relative degree value with the first threshold value preset, and the size identification flase drop of described Hamming distance and the second default threshold value controls information, including: at described relative degree value less than described first threshold value, or described Hamming distance more than the second threshold value time, be identified as flase drop and control information.
In above-mentioned implementation, the relative degree value of described calculating decoding path, including: obtain the decoding path maximum relation degree value by the Downlink Control Information verified, and the absolute value sum of the log-likelihood ratio LLR data of the decoding input corresponding to described Downlink Control Information, calculate the ratio of described maximum relation degree value and the absolute value sum of described LLR data, obtain the relative degree value of decoding path.
In above-mentioned implementation, described PDCCH is encoded to tail-biting convolutional code, described in be decoded as viterbi decoding.
The embodiment of the present invention also provides for a kind of device identifying that flase drop controls information, and described device includes: computing module, acquisition module and identification module；Wherein,
Described computing module, for calculating the relative degree value of the decoding path by the Downlink Control Information verified；
Described acquisition module, for obtaining the initial state of decoding survivor path and terminating state, calculates the Hamming distance between described initial state and described termination state；
Described identification module, for the size according to described relative degree value with the first threshold value preset, and the size identification flase drop of described Hamming distance and the second default threshold value controls information.
In above-mentioned implementation, multiple threshold values relevant for AL that described first threshold value comprises the CCE taken to PDCCH.
In above-mentioned implementation, described identification module, specifically at described relative degree value less than described first threshold value, or described Hamming distance more than the second threshold value time, be identified as flase drop control information.
In above-mentioned implementation, described computing module, specifically for obtaining the decoding path maximum relation degree value by the Downlink Control Information verified, and the absolute value sum of the LLR data of the decoding input corresponding to described Downlink Control Information, calculate the ratio of described maximum relation degree value and the absolute value sum of described LLR data, obtain the relative degree value of decoding path.
In above-mentioned implementation, described PDCCH is encoded to tail-biting convolutional code, described in be decoded as viterbi decoding.
What the embodiment of the present invention provided identifies that flase drop controls method and the device of information, and calculating is by the relative degree value of the decoding path of the Downlink Control Information of verification；Obtain the initial state of decoding survivor path and terminate state, calculating the Hamming distance between described initial state and described termination state；Size according to described relative degree value with the first threshold value preset, and the size identification flase drop control information of described Hamming distance and the second default threshold value.So, it is possible when not producing DCI missing inspection, efficiently identify the DCI of flase drop, improve the stability of LTE system and the performance of LTE system.
Accompanying drawing explanation
Fig. 1 is the structural representation of tail biting convolution coder of the present invention；
Fig. 2 is the state transfer schematic diagram in embodiment of the present invention convolution coder T-1 moment to T moment；
Fig. 3 is the handling process schematic diagram that embodiment of the present invention identification flase drop controls the method for information；
Fig. 4 is the handling process schematic diagram that the embodiment of the present invention determines the first threshold value；
Fig. 5 is that embodiment of the present invention DCI correctly detects and the scattergram of max_Measure and the rawBER in flase drop situation；
Fig. 6 is the device composition structural representation that embodiment of the present invention identification flase drop controls information.
Detailed description of the invention
For being more fully understood that the embodiment of the present invention, below the PDCCH channel demodulation techniques of LTE system are described in detail.
PDCCH is used for carrying DCI, the schedule information of as above/downlink data transmission, uplink power control information and common control information etc.；In order to support link circuit self-adapting, and reducing the UE complexity detected as far as possible, PDCCH resource Mapping Design is with CCE for ultimate unit；One PDCCH be likely to take AL respectively 1,2,4,8 CCE.
In LTE system, a descending sub frame is likely to carry multiple PDCCH, and first each PDCCH carries out independent CRC calculating, scrambling, chnnel coding, and carries out rate-matched according to AL；Then, in one subframe, all of PDCCH is multiplexed with a data bit flow, and this data stream is filled with, each PDCCH channel is made to meet the rule of CCE original position of definition, that is: the integral multiple CCE position of AL to be the original position of the PDCCH of n be n, and the data bit flow length after filling can be full of all resources of OFDM (OrthogonalFrequencyDivisionMultiplexing, the OFDM) symbol distributing to PDCCH；Described resource is to be indicated channel (PhysicalControlFormatIndicatorChannel by control format, what PCFICH) indicate removes the resource that takies of PCFICH and resource that mixed automatic retransfer instruction physical channel (PhysicalHARQIndicatorChannel, PHICH) takies；Again the data stream formed is carried out scrambling, modulation and multiple antenna map, be finally mapped to distribution to the physical resource of PDCCH.
Tail-biting convolutional code (the Tail-BitingConvolutionalCoding that PDCCH chnnel coding adopts limited length to be seven, TBCC), the structural representation of tail biting convolution coder, as it is shown in figure 1, coding polynomial is G0=133 (octal), G1=171 (octal), G2=165 (octal)；Adopt the dwell vessel original state of complete zero the difference is that in tail-biting convolutional code with common convolutional code scheme, the original state of six depositors is set to the numerical value of last six bits of coded data block, so, the initial state of convolutional encoding and final state will be identical states, eliminate the tail bit for done state zero in common convolutional code scheme；Tail-biting convolutional code is generally adopted viterbi interpretation method and decodes.
Viterbi decoding algorithm is a kind of maximum-likelihood decoding method, and the output that namely decoder selects always makes the code word that receiving sequence conditional probability is maximum.According to maximum-likelihood decoding principle, all possible path is asked for most like with receiving sequence, it may be assumed that apart from minimum one, carry out path backtracking and obtain judgement output.Viterbi algorithm is mainly by process compositions such as " Gabi selection " computing of path metric, the renewal of cumulative metric, the backtrackings of maximum likelihood path.
As encoding constraint length K=7, encoder has 6 shift registers, then have 26=64 states, respectively S0, S1, S2..., S63.In convolutional encoding process, the state S in T moment can be arrived2k、S2k+1The state in T-1 moment have SkAnd Sk+32The two state.The state transfer schematic diagram in convolution coder T-1 moment to T moment, as in figure 2 it is shown, (information bit of input indicated by the solid line is 0) arrives S when inputting information bit and being 02k；When inputting information bit and being 1 (information bit that input is represented by dashed line is 1), arrive S2k+1；Therefore, it can two mutually compare, form a butterfly unit.
Assuming that viterbi decodes the input of three road LLR is pm(i), m=0,1,2, i=0,1 ..., C-1, C is the data length of each road LLR.Then tail-biting convolutional code Viterbi algorithm describes as follows:
(1) initialize；
Define accumulation Euclidean distance measure (i)=0 of each moment state i, i=0,1,2 ..., 63；
(i j) records certain moment S to use PointeriThe input path of condition selecting is Si/2Or Si/2+32, i=0,1,2 ..., 63, j=0,1,2 ..., VITERBI_IT*C+6-1；Wherein, VITERBI_IT*C is maximum viterbi decoding iteration number of times；
Definition viterbi decodes the degree of association value max_metric=0 of optimal path.
Use TraceBack (j) record optimal path recall each moment status information, j=0,1,2 ..., VITERBI_IT*C+6-1.
Convolutional code is generated formula and is rewritten as the decoder convenient form of execution, order
Wherein, Gj,kIt is convolutional code generator polynomial sequence, for the LTE convolutional code adopted,
G0,k=1,0,1,1,0,1,1}, k=0,1 ..., 6；
G1,k=1,1,1,1,0,0,1}, k=0,1 ..., 6；
G2,k=1,1,1,0,1,0,1}, k=0,1 ..., 6；
Si,kIt it is then the state variable i kth bit value represented with binary value；
Make again
Wherein,Value be 0,1}, corresponding gi,jValue be 1 ,-1}.
(2) " Gabi selection " computing of path metric；
It is abs_metric=0 that definition viterbi inputs LLR data absolute value cumulative sum.
Loop0: enumerator i from 0 to C-1, tempSum=| p0(i)|+|p1(i)|+|p2(i)|；
Abs_metric+=tempSum；
The Loop0 of enumerator i is terminated；
Abs_metric=abs_metric*VITERBI_IT.
If search length N=VITERBI_IT*C+6 forward
Loop1: enumerator i from 0 to N-1, in each step, to each state computation measure one by one, and carries out Gabi selection operation；
Each count value j of Loop2: enumerator j (j=0,1 ..., 31)；
Calculate E=gj,0p0(imodC)+gj,1p1(imodC)+gj,2p2(imodC)；
(a) ifmeasure (j)+E > measure (j+32)-E,
NextMeasure (2j)=measure (j)+E and Pointer (2j, i)=0
else
NextMeasure (2j)=measure (j+32)-E and Pointer (2j, i)=1
(b) ifmeasure (j)-E > measure (j+32)+E,
NextMeasure (2j+1)=measure (j)-E and Pointer (2j+1, i)=0
else
NextMeasure (2j+1)=measure (j+32)+E and Pointer (2j+1, i)=1
The Loop2 of enumerator j is terminated；
After treating each state computation, make measure (j)=nextMeasure (j)；
Wherein, j=0,1 ..., 63；
The Loop1 of enumerator i is terminated；
(3) optimal path backtracking；
Make max_metric=measure (0), TraceBack (max_it*C+5)=0；
Loop3: enumerator i counts 0 from VITERBI_IT*C+5, in each step:
IfPointer (TraceBack (i), i)=0
else
The Loop3 of enumerator i is terminated；
(4) the original state state0 and final state state1 of output decoding result and correspondence；
Out_bits (i)=TraceBack (i+ (VITERBI_IT-2) * C) mod2, i=0,1 ..., C-1；
State0=TraceBack ((VITERBI_IT-2) * C-1)；
State1=TraceBack ((VITERBI_IT-1) * C-1).
In LTE system, the resource collection of definition PDCCH blind check is PDCCH search space, and search volume is divided into public search space and UE dedicated search space；Wherein, public search space is for transmission and paging, accidental access response, BCCH (BroadcastControlChannel, BCCH) etc. relevant control information, public search space is the UE PDCCH resource set that must detect, in public search space, the AL value of PDCCH is 4 or 8, and its CCE original position is 0；UE dedicated search space is the UE one's own PDCCH resource set that must detect, for transmission and DSCH Downlink Shared Channel (DownlinkShareChannel, DL-SCH), Uplink Shared Channel (UplinkShareChannel, UL-SCH) etc. relevant control information, the AL value of the PDCCH in UE dedicated search space is 1,2,4 or 8；The Radio Network Temporary Identifier (RadioNetworkTemporaryIdentifier, RNTI) of the original position in UE dedicated search space, subframe number and UE is relevant.
UE is according to self state in which and expects the DCI information received in this condition, and various possible DCI format and the resource location being likely to take are carried out trial and error decoding；Owing to UE knows the search volume of self, therefore, UE can know which CCE DCI is likely distributed on；For different expectation information, UE does CRC check with X-RNTI corresponding with expectation information with the CCE belonged in self search volume, if CRC check success, UE then confirms that this information is self needs, has also known corresponding DCI format.
Generally, which AL value the uncertain base station of UE adopts to send DCI, so UE is by the search of all AL values that may be present；As: for public search space, UE needs to scan for by AL=4 and AL=8 respectively；When searching for by AL=4,16 CCE need search 4 times, namely have 4 CCH to control channel candidate code (ControlChannelCandidats, Candidates)；When searching for by AL=8,16 CCE need search 2 times, namely have 2 CCHCandidates；So, for public search space, one has 6 CCHCandidates.For UE dedicated search space, UE needs to scan for by AL=1,2,4 and 8 respectively；According to LTErelease8/9 specification, the number of times of UE dedicated search space requirement search is 16 times, therefore, in a descending sub frame, combines according to the DCI format of maximum possible, and blind Detecting number of times maximum for UE is 2 × (6+16)=44 time.
In actual test process, in each AL value, flase drop goes out the probability difference of DCI, and the distribution of viterbi decoding path relative degree value (max_measure) also differs, max_measure value inputs log-likelihood ratio (Log-LikelihoodRatio equal to viterbi decoding path maximum relation degree value (max_metric) and viterbi, LLR) ratio of data absolute value cumulative sum (abs_metric), it may be assumed that max_measure=max_metric/abs_metric)；Generally, the flase drop DCI of more than 80% all detects on AL=1 and AL=2, and the DCI that flase drop arrives on AL=1 and AL=2, its viterbi decoding path relative degree value max_measure is also at a relatively high.
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
What the embodiment of the present invention provided identifies that flase drop controls the handling process of the method for information, as it is shown on figure 3, comprise the following steps:
Step 101, calculating is by the relative degree value of the decoding path of the Downlink Control Information of verification；
Specifically, first the decoding path maximum relation degree value by the Downlink Control Information verified is obtained, and the absolute value sum of the LLR data of the decoding input corresponding to described Downlink Control Information, calculate the ratio of described maximum relation degree value and the absolute value sum of described LLR data again, obtain the relative degree value of decoding path；
Wherein, described in be verified as cyclic redundancy check (CRC) (CyclicRedundanceCheck, CRC), described in be decoded as viterbi decoding；Described maximum relation degree value max_metric represents, the ratio abs_metric of the absolute value sum of described LLR data represents, described relative degree value max_measure represents, max_measure=max_metric/abs_metric；
Here, max_metric and abs_metric acquisition methods, referring to above-mentioned viterbi arthmetic statement part, repeats no more here.
Step 102, obtains the initial state of decoding survivor path and terminates state, calculating the Hamming distance between described initial state and described termination state；
In tail-biting convolutional code, the original state of six depositors being generally set to the data of last six bits of coded data block, so, the primary state state0 and termination state state1 that rises of convolutional encoding is identical；In decoding process, the state0 of the survivor path characteristic equal to state1 can be utilized as one of end condition of viterbi decoding iteration, or the identification condition as DCI flase drop；
But, for saving hardware resource, reduce the time that single decoding consumes, it is ensured that the sequential of LTE system, reduce the power consumption of LTE system, when implementing, the maximum of viterbi decoding iteration number of times can be limited；When wireless channel conditions is bad, UE is when DCI blind detection, even if reaching maximum viterbi decoding iteration number of times, state0 and the state1 of its survivor path is also not necessarily equal；Owing to the error correcting capability of viterbi decoding can correct the bit of mistake, therefore, even if state0 and the state1 of survivor path is unequal, the result of viterbi decoding is also correct；In this case, if the state0 using survivor path is equal to state1 as the judgment condition of DCI error detection, then DCI missing inspection can be produced；Further, when wireless channel conditions is bad, this missing inspection situation can be very serious, greatly have impact on the performance of LTE system；
Therefore, the embodiment of the present invention decodes the initial state state0 of survivor path by obtaining viterbi and terminates state state1, calculates the Hamming distance between described initial state state0 and described termination state state1 as identifying that flase drop controls the factor of information；
Wherein, the Hamming distance between described initial state state0 and described termination state state1 is calculated particularly as follows: calculate the number of the initial state state0 bit different from the termination state state1 binary numeral of survivor path of survivor path；The acquisition methods of the initial state state0 of survivor path and termination state state1, referring to above-mentioned viterbi arthmetic statement part, repeats no more here.
Step 103, according to described relative degree value with preset the first threshold value size, and described Hamming distance with preset the second threshold value size identification flase drop control information；
Specifically, at described relative degree value less than described first threshold value, or described Hamming distance more than the second threshold value time, be identified as flase drop control information；Otherwise, it is identified as non-flase drop and controls information；
Wherein, described first threshold value is multiple threshold values that the AL comprising the CCE taken to PDCCH is relevant, AL=1,2,4,8；First threshold value corresponding with AL=1 is TH1, and first threshold value corresponding with AL=2 is TH2, and first threshold value corresponding with AL=4 is TH4, and first threshold value corresponding with AL=8 is TH8；
Here, it is determined that the handling process of the first threshold value, as shown in Figure 4, comprise the following steps:
Step a, arranges different snr value (SIGNAL-NOISERATIO, SNR) corresponding for AL；
Described SNR is the PDCCH operating point that 3GPPTS36.101 specification sets, the SNR value that namely PDCCH Block Error Rate (BLER) is corresponding when being 1%.
Step b, records original DCI bit.
DCI data are carried out CRC interpolation, chnnel coding, transmission by step c.
Step d, the DCI Bit data pass through verification and the original DCI bit of record contrast, and record, according to the result contrasted, relative degree value, rawBER and viterbi decoding survivor path initial state and the termination state that correctly detection decodes with viterbi in flase drop situation respectively；
Wherein, rawBER is the coded-bit obtained after the bit sequence that viterbi decoding exports is encoded, carry out, with the soft Bit data of viterbi decoding input, the bit sequence that hard decision obtains to compare, compare and obtain both different bit numbers and input the ratio shared by soft Bit data length relative to viterbi.
Step e, statistics DCI correctly detect with in flase drop situation, the scattergram of max_Measure and rawBER；
Wherein, during AL=1, DCI correctly detects and the scattergram of max_Measure and the rawBER in flase drop situation, as it is shown in figure 5, round dot represents the DCI of correct detection, circle represents the DCI of flase drop.
Step f, sets the first thresholding according to the scattergram that DCI correctly detects with max_Measure and the rawBER in flase drop situation；
Specifically, for AL=1, as it is shown in figure 5, the max_Measure value that abscissa is the DCI detected；The DCI of correct detection, its max_Measure Distribution value is all higher than 0.95, and the max_Measure Distribution value of flase drop DCI is respectively less than 0.9087, therefore, the viterbi decoding gate limit value TH1 of AL=1 is set as 0.9087, when not producing missing inspection, whole flase drop DCI can be removed；
First threshold value includes TH1, TH2, TH4 and TH8, accordingly, can obtain TH2=0.815, TH4=0.7, TH8=0.65.
In the process performing step b to step e, add up and analyze DCI and correctly detect the bit number distribution different from viterbi decoding survivor path original state state0 in flase drop situation and final state state1 binary numeral；When maximum viterbi decoding iteration number of times is 3, when both state0 and state1 binary numeral difference bit number is less than 2, DCI can be reached and detect the optimal compromise of probability of false detection and false dismissal probability；Therefore, the second threshold T=2 are set.
It should be noted that in the embodiment of the present invention, step 101 and step 102 are absent from the sequencing performed, and both can first carry out step 101, then perform step 102, it is also possible to first carry out step 102, then perform step 101.
For realizing the method that above-mentioned identification flase drop controls information, the embodiment of the present invention also provides for a kind of device identifying that flase drop controls information, and the composition structure of described device, as shown in Figure 6, including computing module 11, acquisition module 12 and identification module 13；Wherein,
Described computing module 11, for calculating the relative degree value of the decoding path by the Downlink Control Information verified；
Described acquisition module 12, for obtaining the initial state of decoding survivor path and terminating state, calculates the Hamming distance between described initial state and described termination state；
Described identification module 13, for the size according to described relative degree value with the first threshold value preset, and the size identification flase drop of described Hamming distance and the second default threshold value controls information.
In above-mentioned implementation, multiple threshold values relevant for AL that described first threshold value comprises the CCE taken to PDCCH.
In above-mentioned implementation, described identification module 13, specifically at described relative degree value less than described first threshold value, or described Hamming distance more than the second threshold value time, be identified as flase drop control information；Otherwise, it is identified as non-flase drop and controls information.
In above-mentioned implementation, described computing module 11, specifically for obtaining the decoding path maximum relation degree value by the Downlink Control Information verified, and the absolute value sum of the LLR data of the decoding input corresponding to described Downlink Control Information, calculate the ratio of described maximum relation degree value and the absolute value sum of described LLR data, obtain the relative degree value of decoding path.
In above-mentioned implementation, described in be verified as cyclic redundancy check (CRC) (CyclicRedundanceCheck, CRC), described in be decoded as viterbi decoding；Described maximum relation degree value max_metric represents, the ratio abs_metric of the absolute value sum of described LLR data represents, described relative degree value max_measure represents, max_measure=max_metric/abs_metric.
In above-mentioned implementation, decode the initial state state0 of survivor path by obtaining viterbi and terminate state state1, calculating the Hamming distance between described initial state state0 and described termination state state1 as identifying that flase drop controls the factor of information；Wherein, the Hamming distance between described initial state state0 and described termination state state1 is calculated particularly as follows: calculate the number of the initial state state0 bit different from the termination state state1 binary numeral of survivor path of survivor path.
In above-mentioned implementation, described first threshold value is multiple threshold values that the AL comprising the CCE taken to PDCCH is relevant, AL=1,2,4,8；First threshold value corresponding with AL=1 is TH1, and first threshold value corresponding with AL=2 is TH2, and first threshold value corresponding with AL=4 is TH4, and first threshold value corresponding with AL=8 is TH8；
Here, step according to Fig. 4 determines the first threshold value, and the first threshold value includes TH1, TH2, TH4 and TH8, TH1=0.9087, TH2=0.815, TH4=0.7, TH8=0.65；
In performing the process of step b to step e shown in Fig. 4, add up and analyze DCI and correctly detect the bit number distribution different from viterbi decoding survivor path original state state0 in flase drop situation and final state state1 binary numeral；When maximum viterbi decoding iteration number of times is 3, when both state0 and state1 binary numeral difference bit number is less than 2, DCI can be reached and detect the optimal compromise of probability of false detection and false dismissal probability；Therefore, the second threshold T=2 are set.
It should be noted that, in actual applications, the function of described computing module 11, acquisition module 12 and identification module 13 can be realized by the central processing unit (CPU) being positioned on the device identifying flase drop control information or microprocessor (MPU) or digital signal processor (DSP) or programmable gate array (FPGA).
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. the method identifying that flase drop controls information, it is characterised in that described method includes:
Calculating is by the relative degree value of the decoding path of the Downlink Control Information of verification；
Obtain the initial state of decoding survivor path and terminate state, calculating the Hamming distance between described initial state and described termination state；
Size according to described relative degree value with the first threshold value preset, and the size identification flase drop control information of described Hamming distance and the second default threshold value.
2. identify the method that flase drop controls information according to claim 1, it is characterised in that described first threshold value comprises the multiple threshold values relevant for degree of polymerization grade AL controlling channel unit CCE taken to downlink physical control channel PDCCH.
3. the method that identification flase drop according to claim 1 or claim 2 controls information, it is characterized in that, the described size according to described relative degree value with the first threshold value preset, and the size identification flase drop control information of described Hamming distance and the second default threshold value, including:
At described relative degree value less than described first threshold value, or described Hamming distance more than the second threshold value time, be identified as flase drop control information.
4. the method that identification flase drop according to claim 1 or claim 2 controls information, it is characterised in that the relative degree value of described calculating decoding path, including:
Obtain the decoding path maximum relation degree value by the Downlink Control Information verified, and the absolute value sum of the log-likelihood ratio LLR data of the decoding input corresponding to described Downlink Control Information, calculate the ratio of described maximum relation degree value and the absolute value sum of described LLR data, obtain the relative degree value of decoding path.
5. according to claim 2 identify flase drop control information method, it is characterised in that described PDCCH is encoded to tail-biting convolutional code, described in be decoded as viterbi decoding.
6. one kind identifies that flase drop controls the device of information, it is characterised in that described device includes: computing module, acquisition module and identification module；Wherein,
Described computing module, for calculating the relative degree value of the decoding path by the Downlink Control Information verified；
Described acquisition module, for obtaining the initial state of decoding survivor path and terminating state, calculates the Hamming distance between described initial state and described termination state；
Described identification module, for the size according to described relative degree value with the first threshold value preset, and the size identification flase drop of described Hamming distance and the second default threshold value controls information.
7. identify that flase drop controls the device of information according to claim 6, it is characterised in that multiple threshold values relevant for AL that described first threshold value comprises the CCE taken to PDCCH.
8. according to claim 6 or 7, identify that flase drop controls the device of information, it is characterized in that, described identification module, specifically at described relative degree value less than described first threshold value, or described Hamming distance more than the second threshold value time, be identified as flase drop and control information.
9. according to claim 6 or 7, identify that flase drop controls the device of information, it is characterized in that, described computing module, specifically for obtaining the decoding path maximum relation degree value by the Downlink Control Information verified, and the absolute value sum of the LLR data of the decoding input corresponding to described Downlink Control Information, calculate the ratio of described maximum relation degree value and the absolute value sum of described LLR data, obtain the relative degree value of decoding path.
10. according to claim 7 identify flase drop control information device, it is characterised in that described PDCCH is encoded to tail-biting convolutional code, described in be decoded as viterbi decoding.
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| PCT/CN2015/082990 WO2016095488A1 (en) | 2014-12-15 | 2015-06-30 | False detection control information recognition method, device, and storage medium |
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