CN102255688B - LTEPDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device - Google Patents
LTEPDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device Download PDFInfo
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Abstract
The invention discloses a LTE PDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device. According to the device, the PDCCH blind inspection times can be reduced by limiting polymerization grade ranges to be inspected in a certain range through a polymerization grade range calculation unit, a candidate PDCCH number calculation unit, an uplink/downlink scheduling state maintenance unit, a searching space state maintenance unit and a candidate PDCCH position calculation unit; and the repeated inspection of the same CCE (Control Channel Element) initial position in the same polymerization grade can be prevented by limiting the number of candidate PDCCH corresponding to each polymerization grade in a certain range; the inspected state of each CCE in a searching space is maintained to avoid the repeated inspection of CCE positions of detected DCI (Downlink Control Information) in different polymerization grades; and uplink/downlink scheduling states are maintained to reduce the inspection of uplink/downlink scheduling PDCCH number. By using all the units, the computation quantity and the searching time can be decreased; and the error inspection probability and the system power consumption can be reduced.
Description
Technical field
The present invention relates to communication technical field, say so more specifically, the blind check control method and the device that relate to a kind of LTE (Long Term Evolution system, long evolving system) PDCCH (physical downlink control channel, Physical Downlink Control Channel).
Background technology
Current at 3G in the process of the evolution of 4G, the 4G wireless communication system is generally thought widely by the LTE system, it supports that link transmission can be supported flexibly physical resource configuration, support up-downgoing HARQ (Hybrid Automatic Repeat Request in 1.4M～20M system bandwidth, the system bandwidth, the mixed automatic retransfer request) process, uplink power control process, and support that simultaneously 200 users are online.Control for link transmission corresponding to above-mentioned functions mainly is carried among the different PDCCH, namely from different DCI format (downlink control information format, the control information form of transmission) correspondence.Wherein, DCI format comprises DCI Format 0,1,1A, 1B, 1C, 1D, 2,2A, 2B, 3 and 3A.
In the LTE system, eNode B (Evolved Node B, evolved Node B, base station in the LTE system) different user, broadcasting, PDCCH process corresponding to paging are added 16 CRC (Cyclic redundancy check, cyclic redundancy check (CRC)), 16 CRC are carried out RNTI, and (wireless network is identified temporarily, as user's sign) after scrambling, coding, rate-matched, PDCCH are multiplexing, QPSK modulation, antenna mapping process, by the PDCCH transmission to UE (user) side.
At the physical resource of PDCCH transmission take CCE as unit (CCE comprises 36 RE, Resource Element, resource element); A PDCCH may take L=1,2,4,8 CCE (i.e. four different Aggregation level (polymerization grade) L).For different DCI formats, the raw information length of PDCCH is not identical, consists of whole PDCCH search volume after each PDCCH process is multiplexing, for descending sub frame k, and the CCE number N that whole PDCCH search volume takies
CCE, kIndication by PCFICH (physical format indicating channel) is determined.
The whole search volume of multiplexing formation is divided into Common (public search space) and UE-specific (the specific search volume of user) two class search volumes; For different Aggregation level L, determine again different search volumes
The search volume of specifically determining for different Aggregation level, the original position that PDCCH takies CCE is (take 16 CCE as example) as shown in Figure 1: the original position of L=1 is arbitrarily; The original position of L=2 is 2 multiple; The original position of L=4 is 4 multiple; The original position of L=8 is 8 multiple, namely in the definite search volume of L
In, the PDCCH candidate number that comprises is M
(L)According to the dissimilar search volume of TS36.213 standard of 3GPP, L and M
(L)Relation as shown in table 1.
Table 1:
For subframe k, Aggregation level L, N
CCE, k, the search volume
Definite formula of relation is:
Wherein, i=0,, L-1; M=0,, M
(L)-1;
In the above-mentioned formula (1), for Common search volume, Y
k=0; For UE-specific search volume, Y
kDetermined by following formula:
Y
k＝(A·Y
k-1)modD (2)
Wherein, A=39827; D=65537; Y
-1=n
RNTI≠ 0, be the value of C-RNTI (residential quarter-Radio Network Temporary Identifier) or Temporary (temporarily) C-RNTI.
For UE, the DCI type that eNodeB sends, the DCI type adopts Aggregation level, and the position of DCI in the search volume is unknowable.When being in the situation of competing random access, for the subframe that the resolution that is at war with receives, what UE can not determine the eNodeB transmission is the re-transmission indication of Message3, or the competition resolution; When being in the situation of supporting semi-persistent scheduling, what UE can not determine the eNodeB transmission is the control information of dynamic dispatching, or the control information of semi-persistent scheduling.
Therefore, receiving system message is in the process of the different conditions of regular traffic processing after Cell searching is finished, UE need to be in whole search volume, for different Aggregation level, the different position of DCI in the search volume, and the corresponding DCI type of RNTI traveled through (RNTI that may exist comprises: RA-RNTI, Temporary C-RNTI, C-RNTI, SPS C-RNTI, SI-RNTI, P-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI), namely the mode by blind check obtains correct DCI.By in the table 1 as can be known, in a 1ms, UE may need could obtain whole DCI through 44 (can directly determine according to 3GPP TS36.213 agreement) blind searches, by formula (1) and (2) as can be known, what relate in ergodic process asks modular arithmetic, realize for hardware, ask the operand of mould all can be larger.Therefore, along with the increase of the number of times that travels through, amount of calculation also can increase thereupon, and the time of computing also correspondingly lengthens.
Because each descending sub frame need to adopt the mode of blind check to detect the PDCCH control information in the prior art, in the blind check process, may carry out duplicate detection to identical position, and owing to the variation of channel, the impact of noise, for same RNTI, may detect two kinds of different descending DCI; For different RNTI, also might detect simultaneously uplink scheduling information.Therefore, adopt the blind check control method of above-mentioned prior art, not only operand is large, search time is long, also can increase the probability of flase drop, thereby brings the problem of unnecessary system power dissipation.
Summary of the invention
In view of this, the invention provides blind check control method and the device of a kind of LTE PDCCH, to overcome in the prior art because operand is large, search time is long and probability of false detection is higher, causes the problem of unnecessary system power dissipation.
For achieving the above object, the invention provides following technical scheme:
The blind check control method of a kind of LTE PDCCH comprises:
Obtain the physical resource CCE number that physical downlink control channel PDCCH takies, according to described CCE number initialization is carried out in whole PDCCH search volume, and calculate the scope of the polymerization grade that detects;
In the scope of described polymerization grade, calculate candidate PDCCH number corresponding to public Common search volume and user particular UE-each polymerization grade of specific search volume;
The relation of dividing in advance according to the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, the up-downgoing dispatch state of each RNTI of initialization, the up-downgoing dispatch state of described RNTI comprises: when RNIT had descending DCI, described RNTI had the descending scheduling state; When RNIT had up DCI, described RNTI had the uplink scheduling state.
Scope according to the polymerization grade of determining, judge whether the Common search volume is detected, if not, the relation of then dividing in advance according to RNTI and up-downgoing DCI, determine the UE-specific search volume detected, carry out and upgrade this step of polymerization grade that current search space domestic demand detects;
If so, then reach the described polymerization rate range of determining according to described polymerization grade from large extremely little priority orders, upgrade the polymerization grade that current search space domestic demand detects;
Upgrade the index of candidate PDCCH under the polymerization grade after the current renewal, and calculate the CCE original position of candidate PDCCH under the described index;
When the CCE of described candidate PDCCH original position is effective, according to described CCE original position and corresponding described polymerization grade, read the PDCCH data of buffer memory;
According to the up-downgoing dispatch state of current RNTI, the described PDCCH data of buffer memory are carried out rate de-matching and decoding, and decode results is carried out cyclic redundancy check (CRC) descrambling and judgement;
Result after feeding back described CRC descrambling and adjudicating is according to the up-downgoing dispatch state of the current court verdict current search volume of detecting of renewal and current described RNTI.
Preferably, comprising:
To the CCE scope of preset length, do not have the status indication of CCE for detecting DCI in described CCE original position, the CCE original position of described candidate PDCCH is effective;
When in described CCE original position to the CCE scope of preset length, the status indication that CCE arranged is when detecting DCI, described CCE original position is invalid, finishes in this scope the detection to candidate PDCCH;
Return this step of index of candidate PDCCH under the polymerization grade after current renewal is upgraded in execution.
Preferably, upgrade the current search volume of detecting according to current court verdict, and after the up-downgoing dispatch state of current described RNTI, also comprise:
Judgement when whether the candidate PDCCH under the pre-polymerization grade detects is finished, and if not, then returns this step of index of candidate PDCCH under the polymerization grade after current renewal is upgraded in execution;
If so, judging then whether the current search space is detected finishes;
Do not detect when finishing when the current search space, then return to carry out and upgrade this step of polymerization grade that current search space domestic demand detects;
After the detection of current search space is finished, judge whether the current search space is the Common search volume, if so, then return and carry out the relation of dividing in advance according to RNTI and up-downgoing DCI, determine this step of UE-specific search volume that detects; If not, then finish whole blind check control procedure.
Preferably, the process of calculating the scope of the polymerization grade that detects according to described CCE number comprises:
Calculate the CCE number that the whole PDCCH of current subframe search volume takies;
When described CCE number more than or equal to 8 the time, determine that the scope of the polymerization grade that detects is: { 1,2,4,8};
When described CCE number less than 8, more than or equal to 4 o'clock, determine that the scope of the polymerization grade that detects is: { 1,2,4};
When described CCE number less than 4, more than or equal to 2 o'clock, determine that the scope of the polymerization grade that detects is: { 1,2};
When described CCE number less than 2 the time, determine that the scope of the polymerization grade that detects is: { 1}.
Preferably, the process of candidate PDCCH number corresponding to each polymerization grade comprises in described calculating Common and the UE-specific search volume:
Determine successively current search volume corresponding to polymerization grade of detecting, obtain the candidate PDCCH number that comprises in the polymerization grade of current search space corresponding;
Judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to the current search space corresponding of described candidate PDCCH number;
If so, determine that described candidate PDCCH number is the current search volume of detecting to the candidate PDCCH number in should the polymerization grade;
If not, described initialized candidate PDCCH number deducted one after, return to carry out and judge this step.
The blind check control device of a kind of LTE PDCCH comprises:
Polymerization rate range computing unit is used for obtaining the physical resource CCE number that physical downlink control channel PDCCH takies, and calculates the polymerization rate range that detects according to described CCE number;
Candidate PDCCH number computing unit is used for receiving described polymerization rate range, calculates universal space Common and candidate PDCCH number corresponding to each polymerization grade of user's particular space UE-specific in the search volume;
Up-downgoing dispatch state maintenance unit is used for dividing in advance the relation of the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, and safeguards the up-downgoing dispatch state of RNTI;
State-maintenance unit, search volume is used for search volume initialization and renewal; The relation of dividing in advance according to the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, and the scope of described polymerization grade inquires about, and determines Common search volume or the UE-specific search volume detected; According to the search volume state of safeguarding, determine the effective CCE original position of candidate PDCCH;
Candidate PDCCH position calculation unit, be used for according to described polymerization grade from large to little priority orders, obtain the CCE original position of the candidate PDCCH that determines that each described polymerization grade in the Common search volume detected or the UE-specific search volume is corresponding;
Data cached reading unit is used for when described CCE original position is effective, according to corresponding described polymerization grade, reads PDCCH data and the length of buffer memory;
Rate de-matching and decoding unit, be used for the up-downgoing dispatch state according to current RNTI, described PDCCH data to buffer memory are carried out rate de-matching and decoding, and the up-downgoing dispatch state of described RNTI comprises: when RNIT had descending DCI, described RNTI had the descending scheduling state; When RNIT had up DCI, described RNTI had the uplink scheduling state;
Cyclic redundancy check (CRC) descrambling and decision unit are used for the up-downgoing dispatch state according to current RNTI, and the not detected DCI corresponding to described up-downgoing dispatch state carries out cyclic redundancy check (CRC) descrambling and judgement.
Preferably, also comprise in the state-maintenance unit, described search volume:
Initialization module is used for receiving the CCE number that whole PDCCH search volume takies, and according to described CCE number initialization is carried out in the search volume;
Judge module is used for receiving the CCE original position of candidate PDCCH, and judges whether the CCE original position of described candidate PDCCH is effective; When in described CCE original position to the CCE scope of preset length, the status indication that CCE arranged is when detecting DCI, described CCE original position is invalid, finishes in this scope the detection to candidate PDCCH; When in described CCE original position to the CCE scope of preset length, the status indication that does not have a CCE is when detecting DCI, described CCE original position is effective.
Preferably, also comprise:
The first update module in the state-maintenance unit, described search volume for the feedback result that receives described CRC descrambling and judgement, is upgraded the current Common that detects or UE-specific search volume according to described feedback result;
The second update module in the described up-downgoing dispatch state maintenance unit for the feedback result that receives described CRC descrambling and judgement, is upgraded the up-downgoing dispatch state of current described RNTI according to described feedback result.
Preferably, also comprise in the described polymerization rate range computing unit:
Computing module is used for calculating the CCE number that the whole PDCCH of current subframe search volume takies;
The first judge module is used for whether judging described CCE number more than or equal to 8, if so, determines that then the scope of the polymerization grade that detects is: { 1,2,4,8}; If not, then enter the second judge module;
The second judge module is used for whether judging described CCE number less than 8, more than or equal to 4, if so, determines that then the scope of the polymerization grade that detects is: { 1,2,4}; If not, then enter the 3rd judge module;
The 3rd judge module is used for whether judging described CCE number less than 4, more than or equal to 2, if so, determines that then the scope of the polymerization grade that detects is: { 1,2}; If not, the scope of then determining the polymerization grade that detects is: { 1}.
Preferably, also comprise in the described candidate PDCCH number computing unit:
Acquisition module is used for determining successively current search volume corresponding to polymerization grade of detecting, and obtains the candidate PDCCH number that comprises in the polymerization grade of current search space corresponding;
The 4th judge module, be used for judging whether initialized candidate PDCCH number in the polymerization grade more than or equal to the current search space corresponding of described candidate PDCCH number, if so, determine that described candidate PDCCH number is the current search volume of detecting to the candidate PDCCH number in should the polymerization grade; If not, described initialized candidate PDCCH number deducted one after, return and re-execute judgement.
Via above-mentioned technical scheme as can be known, compared with prior art, the invention discloses blind check control method and the device of a kind of LTEPDCCH, mainly be limited in certain scope by the polymerization rate range that will detect, effectively reduce the number of times of PDCCH blind check; And the candidate PDCCH number that each polymerization grade is corresponding restriction within the specific limits, avoids under the same polymeric grade, and same CCE original position is repeated to detect, and namely reduces the number of times of same position duplicate detection; By safeguarding the detected state of each CCE in the search volume, to avoid under the different polymerization grades, the CCE position that has been detected DCI is repeated to detect, and reduces the number of times that identical CCE position is repeated to detect; By safeguarding the up-downgoing dispatch state, reduce the detection of up-downgoing scheduling PDCCH number.Therefore, by apparatus and method disclosed in this invention, probability of false detection be not only can reduce, operand and search time also reduced simultaneously, and the power consumption that has reduced system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
Fig. 1 be disclosed different polymerization grades and PDCCH take CCE in the prior art original position concern schematic diagram (take 16 CCE as example);
Fig. 2 is the flow chart of the blind check control method of the embodiment of the invention one disclosed a kind of LTE PDCCH;
Fig. 3 is the realization flow figure of the scope of the embodiment of the invention one disclosed calculating polymerization grade;
Fig. 4 is the realization flow figure of the embodiment of the invention one disclosed calculated candidate PDCCH number;
Fig. 5 is the block diagram of the blind check control device of the disclosed a kind of LTE PDCCH of the embodiment of the invention.
Embodiment
For quote and know for the purpose of, the explanation of the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and be summarized as follows:
PDCCH:physical downlink control channel, Physical Downlink Control Channel; An important physical channel in the middle of 3GPP LTE and the LTE-A standard;
Common: public;
UE-specific: the user is specific;
CCE:Control Channel Element, the control channel unit;
HARQ:Hybrid Automatic Repeat Request, the mixed automatic retransfer request;
DCI:Downlink Control Information, in the control information of PDCCH transmission, form has a variety of among the LTE, and not same-action is arranged respectively;
DCI format:downlink control information format, the control information form of transmission;
ENodeB:Evolved Node B, evolved Node B, the title of base station among the LTE is compared the Node B among the existing 3G, the integrated function of part RNC, the level of agreement when having reduced communication; Scheduled transmission; The scheduled transmission of broadcast message; And the measurement etc. that arranges and provide eNodeB.
CRC:Cyclic redundancy check, cyclic redundancy check (CRC);
QPSK:Quadrature Phase Shift Keying, Quadrature Phase Shift Keying is a kind of digital modulation mode;
RNTI: Radio Network Temporary Identifier is that the signal message inside between UTRAN and UE and UTRAN identifies as UE.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
By background technology as can be known, in the blind check process that adopts prior art, need to carry out to each descending sub frame the detection of PDCCH control information, inevitably can carry out duplicate detection to identical position, and owing to the variation of channel, the impact of noise, for same RNTI and different RNTI, also can produce different testing results, for adopting above-mentioned blind check control method of the prior art, not only operand is large, search time is long, also can increase the probability of flase drop, and causes unnecessary system power dissipation.
Therefore, the invention provides a kind of apparatus and method for the control of LTE PDCCH blind Detecting, be limited in certain scope by the polymerization rate range that will detect, effectively reduce the number of times of PDCCH blind check; The candidate PDCCH number that each polymerization grade is corresponding limits within the specific limits, avoids under the same polymeric grade, and same CCE original position is repeated to detect, and namely reduces the number of times of same position duplicate detection; By safeguarding the detected state of each CCE in the search volume, to avoid under the different polymerization grades, the CCE position that has been detected DCI is repeated to detect, and reduces the number of times that the CCE position is repeated to detect; By safeguarding the up-downgoing dispatch state, reduce the detection of up-downgoing scheduling PDCCH number.Therefore, by apparatus and method provided by the present invention, the reduction probability of false detection be can reach, operand and search time reduced simultaneously, and the purpose that reduces system power dissipation.The specific implementation process is elaborated by following examples.
Embodiment one
See also accompanying drawing 2, the flow chart for the blind check control method of a kind of LTE PDCCH disclosed by the invention mainly may further comprise the steps:
Step S101 obtains the CCE number that PDCCH takies, and namely determines the size of whole PDCCH search volume, according to described CCE number initialization is carried out in whole PDCCH search volume, calculates the scope of the polymerization grade that detects according to described CCE number.
Execution in step S101, obtain the CCE number that PDCCH takies after, initialization is carried out in whole PDCCH search volume, initialization is carried out take CCE as unit; The CCE number that takies by PDCCH is simultaneously calculated the scope that needs the polymerization grade that detects in the blind check process, the polymerization grade that be about to detect according to this term restriction in certain scope, thereby reduce follow-up processing to the polymerization number of levels, reduce follow-up operand and search time.
Need to prove, in the process of execution in step S101, the process of the scope of the polymerization grade that the described CCE number calculating of concrete foundation detects mainly may further comprise the steps as shown in Figure 3:
Step S301 calculates the CCE number N that takies in the whole PDCCH of the current subframe search volume
CCE, k
Step S302 judges described CCE number N
CCE, kWhether more than or equal to 8, if so, execution in step S303 then, if not, execution in step S304 then.
Step S303 determines that the scope of the polymerization grade that detects is: { 1,2,4,8}.
Step S304 judges described CCE number N
CCE, kWhether less than 8, more than or equal to 4, if so, execution in step S305 then; If not, execution in step S306 then.
Step S305 determines that the scope of the polymerization grade that detects is: { 1,2,4}.
Step S306 judges described CCE number N
CCE, kWhether less than 4, more than or equal to 2, if so, execution in step S307 then; If not, execution in step S308 then.
Step S307 determines that the scope of the polymerization grade that detects is: { 1,2}.
Step S308 determines that the scope of the polymerization grade that detects is: { 1}.
In existing codes and standards, generally comprise four different polymerization grades, namely the not same PDCCH according to grade may take: 1,2,4 or 8 CCE.In carrying out above-mentioned deterministic process, the polymerization grade that PDDCH need to be able to be detected according to progressive judgement is limited in certain scope, thereby reduces follow-up processing to the polymerization number of levels, has saved operand.
Step S102 in the scope of described polymerization grade, calculates candidate PDCCH number corresponding to each polymerization grade in Common search volume and the UE-specific search volume.
Execution in step S102, limiting in the polymerization grade of certain limit through execution in step S101, calculate respectively candidate PDCCH number corresponding to each polymerization grade in Common search volume and the UE-specific search volume, further candidate's number of the PDCCH that each polymerization grade is corresponding is limited in certain scope, avoid under the same polymeric grade same CCE original position to be repeated to detect, reduce follow-up operand and search time.
Need to prove, in the process of execution in step S102, calculate the detailed process of candidate PDCCH number corresponding to each polymerization grade in Common search volume and the UE-specific search volume, as shown in Figure 4, mainly may further comprise the steps:
Step S401 determines current search volume corresponding to polymerization grade of detecting successively, obtains the candidate PDCCH number M that comprises in the polymerization grade of current search space corresponding
k
In step S401
Wherein, N
CCE, kBe the number of CCE, L is the polymerization grade.
Step S402 judges described candidate PDCCH number M
kInitialized candidate PDCCH number M in the polymerization grade more than or equal to the current search space corresponding whether
(L), if so, execution in step S403 then; If not, execution in step S404 then.
Step S403 determines described candidate PDCCH number M
kFor the current search volume of detecting to the candidate PDCCH number in should the polymerization grade.
Step S404 is with described initialized candidate PDCCH number M
(L)(M after deducting one
(L)-1), returns execution in step S402.
In above-mentioned polymerization grade limiting certain limit, calculate respectively candidate PDCCH number corresponding to each polymerization grade in Common search volume and the UE-specific search volume, further candidate's number of the PDCCH that each polymerization grade is corresponding is limited in certain scope, avoid under the same polymeric grade same CCE original position to be repeated to detect, reduce follow-up operand and search time.
Step S103, according to the relation that RNTI and up-downgoing DCI divide in advance, the up-downgoing dispatch state of each RNTI of initialization.
In the process of execution in step S103, the relation that the RNTI that relates to and up-downgoing DCI divide in advance is shown in table 2 and table 3, and wherein, table 2 is RNTI in the Common search volume and the corresponding relation of up-downgoing DCI; Table 3 is RNTI in the UE-specific search volume and the corresponding relation of up-downgoing DCI.
Need to prove, the type of the RNTI that exists in the Common search volume is: SI-RNTI, P-RNTI, RA-RNTI, TPC-PUCCH RNTI, TPC-PUSCH RNTI, Temporary C-RNTI, SPS C-RNTI and C-RNTI.In table 2 beat hook 0,1,1A, 1B, 1C, 1D, 2,2A, 2B, 3 or 3A be DCI format corresponding to each different RNTI.
Table 2:
Table 3:
Need to prove, the type of the RNTI that exists in the UE-specific search volume is: Temporary C-RNTI, SPS C-RNTI and C-RNTI.Same in table 3 beat hook 0,1,1A, 1B, 1C, 1D, 2,2A, 2B, 3 or 3A be DCI format corresponding to each different RNTI.
Also need to prove, the up-downgoing dispatch state of described RNTI comprises: when RNTI had descending DCI, described RNTI had the descending scheduling state; When RNIT had up DCI, described RNTI had the uplink scheduling state.Following table 4 has provided the relation of up-downgoing dispatch state and RNTI.
Table 4:
Has different scheduling for dissimilar RNTI.By in the table 4 as can be known, for type SI-RNTI, P-RNTI and RA-RNTI, only have descending scheduling; For type TPC-PUCCH RNTI, and PC-PUSCH RNTI, only have uplink scheduling; And for type Temporary C-RNTI, C-RNTI and the existing uplink scheduling of SPS C-RNTI, descending scheduling is arranged again.
But, for various types of RNTI, the at most corresponding DCI of descending scheduling, uplink scheduling is at most corresponding DCI also.By execution in step S103 the up-downgoing dispatch state of each RNTI is divided, can guarantee to detect for some RNTI, just stop other DCI corresponding to such scheduling of this RNTI are detected after detecting the corresponding DCI that dispatches, can avoid duplicate detection and fulfil detection ahead of schedule.
When execution in step S104 judges whether the Common search volume detected, if do not detect polymerization grade corresponding to Common search volume, then abandon the detection to public search space, i.e. direct execution in step S105; Detect polymerization grade corresponding to Common search volume if having, then execution in step S106 processes this Common search volume.By execution in step 104, can avoid the unnecessary processing in Common search volume.
In the process of execution in step S105, if the relation according to the correspondence of above-mentioned RNTI and up-downgoing DCI, find and then to abandon the detection of UE-specific search volume at the DCI of UE-specific search volume detection, directly finish the blind check of PDCCH and process; If the up-downgoing dispatch state according to current each RNTI, the DCI that discovery need to detect in the UE-specific search volume is detected in the Common search volume, abandon equally the detection of UE-specific search volume, finish the blind check of PDCCH and process.If according to the up-downgoing dispatch state of current each RNTI, the DCI that discovery need to detect in the UE-specific search volume is not detected in the Common search volume, then execution in step S106 and subsequent processes.
Processing by execution in step S105 can be got rid of unnecessary detection or duplicate detection, thereby save follow-up other function treatment of carrying out, CCE original position such as calculated candidate PDCCH is calculated, rate de-matching, decoding and the processing such as CRC descrambling and judgement, reach and save time, economize the purpose of operand and power consumption.
Step S106 from large to little priority orders and the definite polymerization rate range of step S101, needs the polymerization grade that detects according to described polymerization grade in the renewal current search space.
When execution in step S106, upgrade the polymerization grade and carry out according to order from big to small, add at PDCCH under the prerequisite of 16 CRC, reduced and adopted the oligomerization grade to detect the probability of false detection that brings.
Step S107 upgrades the index m of candidate PDCCH under the pre-polymerization grade, and calculates the CCE original position of candidate PDCCH under this index.
In the process of execution in step S107, the span of index m is determined by the candidate PDCCH number that step S102 determines; The calculating of the CCE original position of candidate PDCCH is determined by formula (1) and (2).
Step 108 judges whether the CCE original position of described candidate PDCCH is effective, if not, and execution in step S109 then; If so, execution in step S110 then.
When execution in step S108, the condition of the judgement of effective CCE original position of carrying out is, in described CCE original position to the CCE scope of preset length, the status indication that CCE arranged is when detecting DCI, described CCE original position is invalid.This preset length equates with polymerization grade L, namely judges to L CCE scope in described CCE original position; If the status indication of not finding CCE is when detecting DCI, described CCE original position is effective.
Step S109 abandons the current CCE original position that calculates, and namely finishes in this scope the detection to candidate PDCCH.
Step S110 according to described CCE original position and corresponding polymerization grade, reads the PDCCH data of buffer memory.
Can reduce the number of times that same position repeats to detect by carrying out above-mentioned steps S104～step S109, thereby reduce the number of times of PDCCH blind check, reduced operand and search time, the power consumption of the system that has reduced.
Step S111 according to the up-downgoing dispatch state of current each RNTI, carries out rate de-matching and decoding to the described PDCCH data of buffer memory.
Need to prove, in the up-downgoing dispatch state indication rate de-matching and decoding of execution in step S111 according to current RNTI, owing in the process of processing the DCI data, because the length of some DCI is identical, therefore further detecting by the type of distinguishing DCI length.Table 5 has been sorted out the DCI with equal length.
Table 5:
Wherein, the length that DCI Format 0/1A/3/3A is corresponding is Type0, and value is identical; The length that DCI Format1C is corresponding is Type1; The length that DCI Format 1,1B, 1D, 2,2A and 2B are corresponding is Type2, although value is incomplete same, according to the regulation of 3GPP TS36.213 (7.1) with (8) transmission mode, above-mentioned DCI can't exist simultaneously.According to up-downgoing scheduling relation, the DCI in Type0 and the Type1 may exist simultaneously, and might with Type2 in a DCI exist simultaneously.
But, when detecting the Common search volume, only can detect length and be DCI corresponding among Type0, the Type1, as shown in table 2.But, when detecting the UE-specific search volume, only can detect length and be DCI corresponding among Type0, the Type2, as shown in table 3.
According to co-relation, no matter in the Common search volume or the UE-specific search volume, for certain CCE original position, the number of times of rate de-matching and decoding mostly is 2 most.By above division to the DCI length type, can avoid the DCI of equal length to carry out repetition rate de-matching and decoding, reduce the number of times of rate de-matching and decoding with this, save processing time and power consumption.
Step S112, according to the up-downgoing dispatch state of current RNTI, the not detected DCI corresponding to described up-downgoing dispatch state carries out cyclic redundancy check (CRC) descrambling and judgement.
When execution in step S112, the not detected DCI corresponding to above-mentioned up-downgoing dispatch state carries out CRC descrambling and judgement.
Step S113, the result after feeding back described CRC descrambling and adjudicating upgrades the current Common search volume of detecting or UE-specific search volume according to described result, and the up-downgoing dispatch state of upgrading current described RNTI.
In step S113, the CRC descrambling that execution in step S112 is obtained and the result of judgement feed back, in the process that detects, utilize the result of feedback to the current Common search volume of detecting or UE-specific search volume, and the up-downgoing dispatch state of current described RNTI is upgraded.
When Common search volume or UE-specific search volume were upgraded, take the CCE original position of current detection as starting point, the polymerization grade was length.If in this scope, detect DCI, just the CCE in this scope is masked as and detects DCI; If in this scope, detect DCI, do not upgrade.By the search volume is upgraded, can guarantee that tested position can not be repeated to detect, avoid rate de-matching, decoding, the reprocessing of CRC descrambling and judgement reaches and saves time, and saves the purpose of operand and reduction system power dissipation.
To the renewal that the up-downgoing dispatch state of current each RNTI is carried out, can avoid equally duplicate detection and fulfil detection ahead of schedule.
Step S114, judgement when whether the candidate PDCCH number under the pre-polymerization grade condition detects is finished.
In execution in step S114, PDCCH candidate number is limited by step S102.Under reaching the described polymerization grade condition that S102 limits during PDCCH candidate number, think that candidate PDCCH number under this polymerization grade detects to finish, continue execution in step S116; Otherwise execution in step 107.
Step S115 judges whether the current search space is detected to finish.
In execution in step S115, the foundation of judgement is whether all the polymerization grades in the definite current search space of step S101 are all tested.If all tested, then this search volume is detected and is finished execution in step S116; Otherwise jump to step S106, continue the detection of the polymerization grade of next priority of execution.
Step S116, whether what judge that current detection finishes is the Common search volume.
Need to prove, what whole blind check process detected first is the Common search volume, the UE-specific search volume of then detecting.If what current detection was finished is the Common search volume, then jump to the detection that step S105 proceeds the UE-specific search volume.Otherwise, illustrate that the blind check process finishes.
By the blind check control method of the invention described above at the disclosed LTE PDCCH of embodiment, not only can effectively reduce the number of times of PDCCH blind check, also avoid under the same polymeric grade, same CCE original position is repeated to detect, namely reduce the number of times of same position duplicate detection, so that reduction probability of false detection, and can reduce the number of times of rate de-matching and decoding, at the minimizing operand and in search time, further realize saving processing time, operation time and search time, and the purpose of the power consumption of system.
Describe the blind check control method of a kind of LTE PDCCH among the disclosed embodiment of the invention described above in detail, can adopt the device of various ways to realize for method of the present invention, therefore the invention also discloses the blind check control device of a kind of LTE PDCCH, the below provides specific embodiment and is elaborated.
See also accompanying drawing 5, block diagram for the blind check control device of the disclosed a kind of LTE PDCCH of the embodiment of the invention mainly comprises: polymerization rate range computing unit 101, candidate PDCCH number computing unit 102, up-downgoing dispatch state maintenance unit 103, state-maintenance unit, search volume 104, candidate PDCCH position calculation unit 105, data cached reading unit 106, rate de-matching and decoding unit 107 and CRC descrambling and decision unit.
Polymerization rate range computing unit 103 is used for obtaining the physical resource CCE number that physical downlink control channel PDCCH takies, and calculates the polymerization rate range that detects according to described CCE number.
In polymerization rate range computing unit 101, mainly also comprise: computing module, the first judge module, the second judge module and the 3rd judge module (not indicating among the figure).
Computing module is used for calculating the CCE number that the whole PDCCH of current subframe search volume takies.
The first judge module is used for whether judging described CCE number more than or equal to 8, if so, determines that then the scope of the polymerization grade that detects is: { 1,2,4,8}; If not, then enter the second judge module.
The second judge module is used for whether judging described CCE number less than 8, more than or equal to 4, if so, determines that then the scope of the polymerization grade that detects is: { 1,2,4}; If not, then enter the 3rd judge module.
The 3rd judge module is used for whether judging described CCE number less than 4, more than or equal to 2, if so, determines that then the scope of the polymerization grade that detects is: { 1,2}; If not, the scope of then determining the polymerization grade that detects is: { 1}.
The implementation procedure of the concrete calculating of above-mentioned polymerization rate range computing unit 103 can be referring to the explanation of accompanying drawing 3 correspondences in above-described embodiment one.
Candidate PDCCH number computing unit 102 is used for receiving described polymerization rate range, calculates universal space Common search volume and candidate PDCCH number corresponding to each polymerization grade of user's particular space UE-specific in the search volume.
In candidate PDCCH number computing unit 102, mainly also comprise: acquisition module and the 4th judge module (not indicating among the figure).
Acquisition module is used for determining successively current search volume corresponding to polymerization grade of detecting, and obtains the candidate PDCCH number that comprises in the polymerization grade of current search space corresponding.
The 4th judge module, be used for judging whether initialized candidate PDCCH number in the polymerization grade more than or equal to the current search space corresponding of described candidate PDCCH number, if so, determine that described candidate PDCCH number is the current search volume of detecting to the candidate PDCCH number in should the polymerization grade; If not, described initialized candidate PDCCH number deducted one after, return and re-execute judgement.
The implementation procedure of the concrete calculating of candidate PDCCH number computing unit 102 can be referring to the explanation of accompanying drawing 4 correspondences in above-described embodiment one.
Up-downgoing dispatch state maintenance unit 103 is used for dividing in advance the relation of RNTI and up-downgoing DCI, and safeguards the up-downgoing dispatch state of RNTI.
In up-downgoing dispatch state maintenance unit 103, also comprise the second update module (not indicating among the figure), this second update module is used for receiving the feedback result of described CRC descrambling and judgement, upgrades the up-downgoing dispatch state of current described RNTI according to CRC descrambling and decision unit feedback of feedback result.
Up-downgoing dispatch state maintenance unit 104 mainly is that the up-downgoing scheduling relation of the RNTI that need to detect current subframe is carried out state-maintenance.
Before detection, the up-downgoing dispatch state of the RNTI that needs are detected is carried out initialization.
In detection, major function comprises:
According to the feedback indication of CRC descrambling and decision unit 108, the up-downgoing dispatch state of each RNTI is upgraded.
Division to RNTI and up-downgoing dispatch state, namely by the relation of RNTI and up-downgoing DCI is divided, guarantee to detect for some RNTI, just stop this RNTI, other DCI corresponding to such scheduling are detected after detecting the corresponding DCI that dispatches, can avoid duplicate detection and fulfil detection ahead of schedule.
Up-downgoing dispatch state indication rate de-matching and decoding unit 107 according to current RNTI need DCI data length to be processed.
According to the up-downgoing dispatch state of current RNTI indication CRC descrambling and decision unit 108 need RNTI to be processed relation with corresponding DCI Formats.
State-maintenance unit, search volume 104 is used for search volume initialization and renewal; The relation of dividing in advance according to the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, and the scope of described polymerization grade inquires about, and determines Common search volume or the UE-specific search volume detected; According to the search volume state of safeguarding, determine the effective CCE original position of candidate PDCCH;
Need to prove, described search volume also comprises in the state-maintenance unit:
Initialization module (not indicating among the figure) according to the CCE number that the PDCCH search volume takies, carries out initialization to whole search volume.
Also comprise: judge module (not indicating among the figure), this judge module is used for receiving the CCE original position of candidate PDCCH, and judges whether the CCE original position of described candidate PDCCH is effective; When in described CCE original position to the CCE scope of preset length, the status indication that CCE arranged is when detecting DCI, described CCE original position is invalid, finishes in this scope the detection to candidate PDCCH; When in described CCE original position to the CCE scope of preset length, the status indication that does not have a CCE is when detecting DCI, described CCE original position is effective.
Also comprise: the first update module (indicating among the figure), for the feedback result that receives described CRC descrambling and judging module 108, upgrade the current Common that detects or UE-specific search volume according to described feedback result.
This state-maintenance unit, search volume 103 mainly is that state-maintenance is carried out in whole PDCCH search volume.
Before detection, initialization is carried out in whole search volume, initialization is take CCE as unit.
In detection, major function comprises:
Feedback result according to CRC descrambling and decision unit 108 is upgraded the search volume, renewal is take the CCE original position of current detection as starting point, the polymerization grade is length, by the search volume is upgraded, guarantee that tested position can not be repeated to detect, avoid follow-up rate de-matching, decoding, the reprocessing of CRC descrambling and judgement, reach and save time, economize the purpose of operand and power consumption.
According to the RNTI of up-downgoing dispatch state maintenance unit 104 maintenances and the relation of up-downgoing DCI, and the scope of polymerization grade, determine whether Common and UE-specific search volume are detected.
In the process that detects, the polymerization grade of indication preferentially detects high polymerization grade according to from big to small order, under the prerequisite of 16 CRC, reduces and adopts the oligomerization grade to detect the probability of false detection that brings.
The CCE original position that calculates according to candidate PDCCH position calculation unit 105, and the polymerization grade of current correspondence are judged whether the position candidate that calculates is effective, and effective position candidate are indicated to data cached reading unit 106.
Carry out state-maintenance by this 103 couples of whole PDCCH search volume, state-maintenance unit, search volume, can reduce the number of times of same position duplicate detection, thereby reduce the number of times of PDCCH blind check, reduce operand and search time, and the power consumption of system.And when detecting end, indicate other functional modules to finish detection.
Candidate PDCCH position calculation unit 105, be used for according to described polymerization grade from large to little priority orders, obtain the CCE original position of the candidate PDCCH that determines that each described polymerization grade among the public search space Common that detects or the specific search volume UE-specific of user is corresponding.
Be that candidate PDCCH position calculation unit 105 is according to the polymerization grade of state-maintenance unit, search volume 103 indications, according to the formula in the background technology (1) and (2), calculate the CCE original position of PDCCH, and result of calculation is sent into state-maintenance unit, search volume 103.
By among Fig. 5 as can be known, also comprise in the disclosed device of the embodiment of the invention: data cached reading unit 106, rate de-matching and decoding unit 107 and CRC descrambling and decision unit 108.
Data cached reading unit 106 is used for when described CCE original position is effective, according to corresponding described polymerization grade, reads PDCCH data and the length of buffer memory.
This data cached reading unit 106 reads the PDCCH data of buffer memory according to effective CCE original position and the polymerization grade of 103 indications of state-maintenance unit, search volume, and data and the length of reading are sent into rate de-matching and decoding unit 107.
Rate de-matching and decoding unit 107, be used for the up-downgoing dispatch state according to current RNTI, described PDCCH data to buffer memory are carried out rate de-matching and decoding, and the up-downgoing dispatch state of described RNTI comprises: when RNIT had descending DCI, described RNTI had the descending scheduling state; When RNIT had up DCI, described RNTI had the uplink scheduling state.
This rate de-matching and decoding unit 107 are processed with decoding the data cached rate de-matching that carries out that reads according to the indication of up-downgoing dispatch state maintenance unit 104.
CRC descrambling and decision unit 108 are used for the up-downgoing dispatch state according to current RNTI, and the not detected DCI corresponding to described up-downgoing dispatch state carries out cyclic redundancy check (CRC) descrambling and judgement.
This CRC descrambling and decision unit 108 carry out CRC descrambling and judgement according to the indication of up-downgoing dispatch state maintenance unit 104, and court verdict fed back to state-maintenance unit, search volume 103 and up-downgoing dispatch state maintenance unit 104, carry out state-maintenance.
By the disclosed device of the invention described above embodiment, the polymerization rate range that will detect is limited in certain scope, effectively reduce the number of times of PDCCH blind check, and the candidate PDCCH number that each polymerization grade is corresponding restriction within the specific limits, avoids under the same polymeric grade, and same CCE original position is repeated to detect, namely reduce the number of times of same position duplicate detection, so that the reduction probability of false detection reduces operand and search time simultaneously, and the power consumption that reduces system.
In sum:
Implement disclosed a kind of method and apparatus for the control of LTE PDCCH blind Detecting by the invention described above, can effectively reduce the number of times of PDCCH blind check, reduce the number of times of same position duplicate detection, reduce the probability of flase drop, computation reduction and search time, thus realization reduces the problem of system power dissipation.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the disclosed method of embodiment, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the blind check control method of a LTE PDCCH is characterized in that, comprising:
Obtain the physical resource CCE number that physical downlink control channel PDCCH takies, according to described CCE number initialization is carried out in whole PDCCH search volume, and calculate the scope of the polymerization grade that detects;
In the scope of described polymerization grade, calculate candidate PDCCH number corresponding to public Common search volume and user particular UE-each polymerization grade of specific search volume;
The relation of dividing in advance according to the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, the up-downgoing dispatch state of each RNTI of initialization, the up-downgoing dispatch state of described RNTI comprises: when RNIT had descending DCI, described RNTI had the descending scheduling state; When RNIT had up DCI, described RNTI had the uplink scheduling state;
Scope according to the polymerization grade of determining, judge whether public Common search volume is detected, if not, the relation of then dividing in advance according to RNTI and up-downgoing DCI, determine user's particular UE of detecting-specific search volume, carry out and upgrade this step of polymerization grade that current search space domestic demand detects;
If so, then reach the described polymerization rate range of determining according to described polymerization grade from large extremely little priority orders, upgrade the polymerization grade that current search space domestic demand detects;
Upgrade the index of candidate PDCCH under the polymerization grade after the current renewal, and calculate the CCE original position of candidate PDCCH under the described index;
When the CCE of described candidate PDCCH original position is effective, according to described CCE original position and corresponding described polymerization grade, read the PDCCH data of buffer memory;
According to the up-downgoing dispatch state of current RNTI, the described PDCCH data of buffer memory are carried out rate de-matching and decoding, and decode results is carried out cyclic redundancy check (CRC) descrambling and judgement;
Result after feeding back described CRC descrambling and adjudicating is according to the up-downgoing dispatch state of the current court verdict current search volume of detecting of renewal and current described RNTI.
2. method according to claim 1 is characterized in that, comprising:
To the CCE scope of preset length, do not have the status indication of CCE for detecting DCI in described CCE original position, the CCE original position of described candidate PDCCH is effective;
When in described CCE original position to the CCE scope of preset length, the status indication that CCE arranged is when detecting DCI, described CCE original position is invalid, finishes in this scope the detection to candidate PDCCH;
Return this step of index of candidate PDCCH under the polymerization grade after current renewal is upgraded in execution.
3. described method according to claim 1 is characterized in that, upgrades the current search volume of detecting according to current court verdict, and after the up-downgoing dispatch state of current described RNTI, also comprises:
Judgement when whether the candidate PDCCH under the pre-polymerization grade detects is finished, and if not, then returns this step of index of candidate PDCCH under the polymerization grade after current renewal is upgraded in execution;
If so, judging then whether the current search space is detected finishes;
Do not detect when finishing when the current search space, then return to carry out and upgrade this step of polymerization grade that current search space domestic demand detects;
After the detection of current search space is finished, judge whether the current search space is public Common search volume, if so, then return and carry out the relation of dividing in advance according to RNTI and up-downgoing DCI, determine user's particular UE of detecting-this step of specific search volume; If not, then finish whole blind check control procedure.
4. the described method of any one is characterized in that according to claim 1 ~ 3, and the process of calculating the scope of the polymerization grade that detects according to described CCE number comprises:
Calculate the CCE number that the whole PDCCH of current subframe search volume takies;
When described CCE number more than or equal to 8 the time, determine that the scope of the polymerization grade that detects is: { 1,2,4,8};
When described CCE number less than 8, more than or equal to 4 o'clock, determine that the scope of the polymerization grade that detects is: { 1,2,4};
When described CCE number less than 4, more than or equal to 2 o'clock, determine that the scope of the polymerization grade that detects is: { 1,2};
When described CCE number less than 2 the time, determine that the scope of the polymerization grade that detects is: { 1}.
5. the described method of any one is characterized in that according to claim 1 ~ 3, and the process of candidate PDCCH number corresponding to each polymerization grade comprises in described calculating public Common search volume and the user's particular UE-specific search volume:
Determine successively current search volume corresponding to polymerization grade of detecting, obtain the candidate PDCCH number that comprises in the polymerization grade of current search space corresponding;
Judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to the current search space corresponding of described candidate PDCCH number;
If so, determine that described candidate PDCCH number is the current search volume of detecting to the candidate PDCCH number in should the polymerization grade;
If not, described initialized candidate PDCCH number deducted one after, return to carry out and judge this step.
6. the blind check control device of a LTE PDCCH is characterized in that, comprising:
Polymerization rate range computing unit is used for obtaining the physical resource CCE number that physical downlink control channel PDCCH takies, and calculates the polymerization rate range that detects according to described CCE number;
Candidate PDCCH number computing unit is used for receiving described polymerization rate range, calculates public Common search volume and candidate PDCCH number corresponding to specific each the polymerization grade of search volume UE-specific of user in the search volume;
Up-downgoing dispatch state maintenance unit is used for dividing in advance the relation of the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, and safeguards the up-downgoing dispatch state of RNTI;
State-maintenance unit, search volume is used for search volume initialization and renewal; The relation of dividing in advance according to the control information form DCI of Radio Network Temporary Identifier RNTI and up-downgoing transmission, the scope that reaches described polymerization grade is inquired about, and determines public Common search volume or the user's particular UE-specific search volume detected; According to the search volume state of safeguarding, determine the effective CCE original position of candidate PDCCH;
Candidate PDCCH position calculation unit, be used for according to described polymerization grade from large to little priority orders, obtain the CCE original position of the candidate PDCCH that determines that each described polymerization grade in the public Common search volume detected or the user's particular UE-specific search volume is corresponding;
Data cached reading unit is used for when described CCE original position is effective, according to corresponding described polymerization grade, reads PDCCH data and the length of buffer memory;
Rate de-matching and decoding unit, be used for the up-downgoing dispatch state according to current RNTI, described PDCCH data to buffer memory are carried out rate de-matching and decoding, and the up-downgoing dispatch state of described RNTI comprises: when RNIT had descending DCI, described RNTI had the descending scheduling state; When RNIT had up DCI, described RNTI had the uplink scheduling state;
Cyclic redundancy check (CRC) descrambling and decision unit are used for the up-downgoing dispatch state according to current RNTI, and the not detected DCI corresponding to described up-downgoing dispatch state carries out cyclic redundancy check (CRC) descrambling and judgement.
7. device according to claim 6 is characterized in that, described search volume also comprises in the state-maintenance unit:
Initialization module is used for receiving the CCE number that whole PDCCH search volume takies, and according to described CCE number initialization is carried out in the search volume;
Judge module is used for receiving the CCE original position of candidate PDCCH, and judges whether the CCE original position of described candidate PDCCH is effective; When in described CCE original position to the CCE scope of preset length, the status indication that CCE arranged is when detecting DCI, described CCE original position is invalid, finishes in this scope the detection to candidate PDCCH; When in described CCE original position to the CCE scope of preset length, the status indication that does not have a CCE is when detecting DCI, described CCE original position is effective.
8. device according to claim 6 is characterized in that, also comprises:
The first update module in the state-maintenance unit, described search volume, be used for receiving the feedback result of described CRC descrambling and judgement, upgrade the current public Common search volume of detecting or user's particular UE-specific search volume according to described feedback result;
The second update module in the described up-downgoing dispatch state maintenance unit for the feedback result that receives described CRC descrambling and judgement, is upgraded the up-downgoing dispatch state of current described RNTI according to described feedback result.
9. the described device of any one is characterized in that according to claim 6 ~ 8, also comprises in the described polymerization rate range computing unit:
Computing module is used for calculating the CCE number that the whole PDCCH of current subframe search volume takies;
The first judge module is used for whether judging described CCE number more than or equal to 8, if so, determines that then the scope of the polymerization grade that detects is: { 1,2,4,8}; If not, then enter the second judge module;
The second judge module is used for whether judging described CCE number less than 8, more than or equal to 4, if so, determines that then the scope of the polymerization grade that detects is: { 1,2,4}; If not, then enter the 3rd judge module;
The 3rd judge module is used for whether judging described CCE number less than 4, more than or equal to 2, if so, determines that then the scope of the polymerization grade that detects is: { 1,2}; If not, the scope of then determining the polymerization grade that detects is: { 1}.
10. the described device of any one is characterized in that according to claim 6 ~ 8, also comprises in the described candidate PDCCH number computing unit:
Acquisition module is used for determining successively current search volume corresponding to polymerization grade of detecting, and obtains the candidate PDCCH number that comprises in the polymerization grade of current search space corresponding;
The 4th judge module, be used for judging whether initialized candidate PDCCH number in the polymerization grade more than or equal to the current search space corresponding of described candidate PDCCH number, if so, determine that described candidate PDCCH number is the current search volume of detecting to the candidate PDCCH number in should the polymerization grade; If not, described initialized candidate PDCCH number deducted one after, return and re-execute judgement.
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