CN102255688A - 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 LTEPDCCH (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 physical resource configuration flexibly, support up-downgoing HARQ (Hybrid Automatic Repeat Request in 1.4M～20M system bandwidth, the system bandwidth, mix automatic repeat requests) process, uplink power control process, and support that simultaneously 200 users are online.Control for the transmission of above-mentioned functions link corresponding mainly is carried among the different PDCCH, promptly with different DCI format (downlink control information format, the control information form of Channel Transmission) correspondences.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) the PDCCH process of different user, broadcasting, paging correspondence is added 16 CRC (Cyclic redundancy check, cyclic redundancy check (CRC)), to 16 CRC carry out that RNTI (wireless network identifies temporarily, as user's sign) scrambling, coding, rate-matched, PDCCH are multiplexing, after QPSK modulation, antenna mapping handle, by the PDCCH Channel Transmission to UE (user) side.
Physical resource in the PDCCH Channel Transmission is unit (CCE comprises 36 RE, Resource Element, resource element) with CCE; 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 inequality, and each PDCCH constitutes whole PDCCH search volume through multiplexing back, 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 (common search space) and UE-specific (user's particular search space) two class search volumes; For different Aggregation level L, determine different search volumes again
The concrete search volume of determining for different Aggregation level, the original position that PDCCH takies CCE is (is example with 16 CCE) 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, promptly in the definite search volume of L
In, the PDCCH candidate number that comprises is M
(L)According to the dissimilar search volumes 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
kDetermine 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 (sub-district-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 that competition inserts at random, for the subframe that the resolution that is at war with receives, what UE can not determine that eNodeB sends is the re-transmission indication of Message3, still 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 be in whole search volume, at 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), promptly 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 bigger.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 extends.
Because each descending sub frame need 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 because variation, the The noise of channel, for same RNTI, may detect two kinds of different descending DCI; For different RNTI, also might detect uplink scheduling information simultaneously.Therefore, adopt the blind check control method of above-mentioned prior art, not only operand is big, 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, because operand is big, search time is long and probability of false detection is higher, cause the problem of unnecessary system power dissipation to overcome in the prior art.
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, initialization is carried out in whole PDCCH search volume, and calculate the scope of the polymerization grade that detects according to described CCE number;
In the scope of described polymerization grade, calculate the candidate PDCCH number of each polymerization grade correspondence of public Common search volume and user particular UE-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 Channel 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 dividing in advance then 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, then reach the described polymerization rate range of determining from big extremely little priority orders according to described polymerization grade, 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,, read the PDCCH data of buffer memory according to described CCE original position and corresponding described polymerization grade;
According to the up-downgoing dispatch state of current RNTI, the described PDCCH data of buffer memory are separated rate-matched 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 current court verdict current search volume of detecting of renewal and current described RNTI.
Preferably, comprising:
To the CCE scope of preset length, the status indication that does not have CCE is for detecting DCI in described CCE original position, and 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 judge then whether the current search space is detected to finish;
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, then return execution according to the relation that RNTI and up-downgoing DCI divide in advance, 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 the candidate PDCCH number of each polymerization grade correspondence comprises in described calculating Common and the UE-specific search volume:
Determine the search volume of the current polymerization grade correspondence that detects successively, obtain the candidate PDCCH number that comprises in the polymerization grade of current search space correspondence;
Judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to current search space correspondence of described candidate PDCCH number;
If 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 to obtain 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 to receive described polymerization rate range, the universal space Common in the calculating search volume and the candidate PDCCH number of each polymerization grade correspondence of user's particular space UE-specific;
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 Channel 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 Channel 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 big to little priority orders, obtain the CCE original position of determining the candidate PDCCH of each described polymerization grade correspondence in the Common search volume detected or the UE-specific search volume;
Data cached reading unit is used for when described CCE original position is effective, according to corresponding described polymerization grade, reads the PDCCH data and the length of buffer memory;
Separate rate-matched and decoding unit, be used for up-downgoing dispatch state according to current RNTI, described PDCCH data to buffer memory are separated rate-matched 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 of described up-downgoing dispatch state correspondence is carried out cyclic redundancy check (CRC) descrambling and judgement.
Preferably, also comprise in the state-maintenance unit, described search volume:
Initialization module is used to receive 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 to receive 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:
First update module in the state-maintenance unit, described search volume is used to receive the feedback result of described CRC descrambling and judgement, upgrades current Common that detects or UE-specific search volume according to described feedback result;
Second update module in the described up-downgoing dispatch state maintenance unit is used to receive the feedback result of described CRC descrambling and judgement, upgrades 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 to calculate the CCE number that the whole PDCCH of current subframe search volume takies;
Whether first judge module is used to judge described CCE number more than or equal to 8, if determine that then the scope of the polymerization grade that detects is: and 1,2,4,8}; If not, then enter second judge module;
Whether second judge module is used to judge described CCE number less than 8, more than or equal to 4, if determine that then the scope of the polymerization grade that detects is: and 1,2,4}; If not, then enter the 3rd judge module;
Whether the 3rd judge module is used to judge described CCE number less than 4, more than or equal to 2, if determine that then the scope of the polymerization grade that detects is: and 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 the search volume of definite current polymerization grade correspondence that detects successively, obtains the candidate PDCCH number that comprises in the polymerization grade of current search space correspondence;
The 4th judge module, be used to judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to current search space correspondence of described candidate PDCCH number, if 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, effectively reduce the number of times of PDCCH blind check by the polymerization rate range that will detect; And the candidate PDCCH number of each polymerization grade correspondence limited within the specific limits, to avoid under the same polymeric grade, same CCE original position is repeated to detect, and promptly 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,, probability of false detection be not only can reduce, operand and search time also reduced simultaneously by apparatus and method disclosed in this invention, 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, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 take for disclosed different polymerization grades in the prior art and PDCCH CCE original position concern schematic diagram (is example with 16 CCE);
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 hereinafter explanation of the technical term of Shi Yonging, 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 mixes automatic repeat requests;
DCI:Downlink Control Information, in the control information of PDCCH Channel 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 Channel 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 is provided with and provides 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 is obtained under the creative work prerequisite.
By background technology as can be known, in the blind check process that adopts prior art, need carry out the detection of PDCCH control information to each descending sub frame, inevitably can carry out duplicate detection to identical position, and because variation, the The noise of channel, 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 big, 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 of the LTE of being used for PDCCH blind Detecting control, be limited in certain scope, effectively reduce the number of times of PDCCH blind check by the polymerization rate range that will detect; The candidate PDCCH number of each polymerization grade correspondence is limited within the specific limits, avoid under the same polymeric grade, same CCE original position is repeated to detect, and promptly 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,, the reduction probability of false detection be can reach, operand and search time reduced simultaneously by apparatus and method provided by the present invention, 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 promptly 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 that unit carries out with CCE; The CCE number that takies by PDCCH is calculated the scope that needs the polymerization grade that detects in the blind check process simultaneously, the polymerization grade that be about to detect according to this term restriction in certain scope, thereby reduce follow-up processing, reduce subsequent operation amount and search time the polymerization number of levels.
Need to prove that 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, execution in step S303 then, if not, execution in step S304 then.
Step S303, determine 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, execution in step S305 then; If not, execution in step S306 then.
Step S305, determine 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, execution in step S307 then; If not, execution in step S308 then.
Step S307, determine 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, promptly 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 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 the candidate PDCCH number of each polymerization grade correspondence 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 the candidate PDCCH number of each polymerization grade correspondence in Common search volume and the UE-specific search volume respectively, further the candidate's number with the PDCCH of each polymerization grade correspondence is limited in certain scope, avoid under the same polymeric grade same CCE original position to be repeated to detect, reduce subsequent operation amount and search time.
Need to prove, in the process of execution in step S102, calculate the detailed process of the candidate PDCCH number of each polymerization grade correspondence in Common search volume and the UE-specific search volume, as shown in Figure 4, mainly may further comprise the steps:
Step S401, the search volume of definite current polymerization grade correspondence that detects obtains the candidate PDCCH number M that comprises in the polymerization grade of current search space correspondence successively
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 current search space correspondence whether
(L), if, 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.
By above-mentioned in limiting the polymerization grade of certain limit, calculate the candidate PDCCH number of each polymerization grade correspondence in Common search volume and the UE-specific search volume respectively, further the candidate's number with the PDCCH of each polymerization grade correspondence is limited in certain scope, avoid under the same polymeric grade same CCE original position to be repeated to detect, reduce subsequent operation amount 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 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 that the type of the RNTI that exists is in the Common search volume: 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 the DCI format of each different RNTI correspondences.
Table 2:
Table 3:
Need to prove that the type of the RNTI that exists is in the UE-specific search volume: 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 the DCI format of each different RNTI correspondences.
Need to prove that also 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, have only descending scheduling; For type TPC-PUCCH RNTI and PC-PUSCH RNTI, has only uplink scheduling; And, descending scheduling is arranged again for type Temporary C-RNTI, C-RNTI and the existing uplink scheduling of SPS C-RNTI.
But, for various types of RNTI, the at most corresponding DCI of descending scheduling, the also at most corresponding DCI of uplink scheduling.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 corresponding DCI of 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 the polymerization grade of Common search volume correspondence, then abandon detection, i.e. direct execution in step S105 to the common search space; If the polymerization grade that detects Common search volume correspondence is arranged, then execution in step S106 handles this Common search volume.By execution in step 104, can avoid Common search volume unnecessary processing.
In the process of execution in step S105, if 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 handle; If up-downgoing dispatch state according to current each RNTI, the DCI that discovery need detect in the UE-specific search volume is detected in the Common search volume, abandon the detection of UE-specific search volume equally, finish the blind check of PDCCH and handle.If according to the up-downgoing dispatch state of current each RNTI, the DCI that discovery need 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 as calculated candidate PDCCH is calculated, separate rate-matched, decoding and processing such as CRC descrambling and judgement, reach and save time, economize the purpose of operand and power consumption.
Step S106 from big extremely 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, execution in step S110 then.
When execution in step S108, the condition of the judgement of effective CCE original position of being carried 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, promptly 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 promptly 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, separates rate-matched and decoding to the described PDCCH data of buffer memory.
Need to prove, in execution in step S111 separates rate-matched and deciphers according to the up-downgoing dispatch state indication of current RNTI, owing in the process of handling the DCI data,, therefore further detect by the type of distinguishing DCI length because the length of some DCI is identical.Table 5 has been sorted out the DCI with equal length.
Table 5:
Wherein, the length of DCI Format 0/1A/3/3A correspondence is Type0, and value is identical; The length of DCI Format1C correspondence is Type1; The length of DCI Format 1,1B, 1D, 2,2A and 2B correspondence is Type2, though 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 exist simultaneously with a DCI among the Type2.
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, still be the UE-specific search volume no matter in the Common search volume, for certain CCE original position, the number of times of separating rate-matched and decoding mostly is 2 most.By above division to the DCI length type, can avoid the DCI of equal length to repeat to separate rate-matched and decoding, reduce the number of times of separating rate-matched and decoding with this, save processing time and power consumption.
Step S112 according to the up-downgoing dispatch state of current RNTI, carries out cyclic redundancy check (CRC) descrambling and judgement to the not detected DCI of described up-downgoing dispatch state correspondence.
When execution in step S112, the not detected DCI of above-mentioned up-downgoing dispatch state correspondence is carried out CRC descrambling and judgement.
Step S113, the result after feeding back described CRC descrambling and adjudicating upgrades 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, the result who utilizes feedback is to 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 are upgraded, be starting point with the CCE original position of current detection, the polymerization grade is a 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 separating rate-matched, 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 duplicate detection equally 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 that what whole blind check process detected earlier is the Common search volume, then the UE-specific search volume of Jian Ceing.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, promptly 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 separating rate-matched 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, provide specific embodiment below and be 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, separate rate-matched and decoding unit 107 and CRC descrambling and decision unit.
Polymerization rate range computing unit 103 is used to obtain 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, first judge module, 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.
Whether first judge module is used to judge described CCE number more than or equal to 8, if determine that then the scope of the polymerization grade that detects is: and 1,2,4,8}; If not, then enter second judge module.
Whether second judge module is used to judge described CCE number less than 8, more than or equal to 4, if determine that then the scope of the polymerization grade that detects is: and 1,2,4}; If not, then enter the 3rd judge module.
Whether the 3rd judge module is used to judge described CCE number less than 4, more than or equal to 2, if determine that then the scope of the polymerization grade that detects is: and 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 the foregoing description one.
Candidate PDCCH number computing unit 102 is used to receive described polymerization rate range, the universal space Common search volume in the calculating search volume and the candidate PDCCH number of each polymerization grade correspondence of user's particular space UE-specific.
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 the search volume of definite current polymerization grade correspondence that detects successively, obtains the candidate PDCCH number that comprises in the polymerization grade of current search space correspondence.
The 4th judge module, be used to judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to current search space correspondence of described candidate PDCCH number, if 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 the foregoing description 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 second update module (not indicating among the figure), this second update module is used to receive the feedback result of described CRC descrambling and judgement, upgrades the up-downgoing dispatch state of current described RNTI according to the feedback result of CRC descrambling and decision unit feedback.
Up-downgoing dispatch state maintenance unit 104 mainly is that the up-downgoing scheduling relation of the RNTI that need 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, promptly by the relation of RNTI and up-downgoing DCI is divided, guarantee to detect for some RNTI, just stop this RNTI, other corresponding DCI of such scheduling are detected after detecting the corresponding DCI that dispatches, can avoid duplicate detection and fulfil detection ahead of schedule.
Separate the DCI data length of rate-matched and the processing of decoding unit 107 needs according to the up-downgoing dispatch state indication of current RNTI.
According to the RNTI of the up-downgoing dispatch state of current RNTI indication CRC descrambling and the processing of decision unit 108 needs 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 Channel 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 that 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 to receive 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: first update module (among the figure indicate), be used to receive the feedback result of described CRC descrambling and judging module 108, upgrade 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 unit with CCE.
In detection, major function comprises:
Feedback result according to CRC descrambling and decision unit 108 is upgraded the search volume, renewal is a starting point with the CCE original position of current detection, the polymerization grade is a length, by the search volume is upgraded, guarantee that tested position can not be repeated to detect, avoid follow-up separate rate-matched, 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, whether decision detects Common and UE-specific search volume.
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 big to little priority orders, obtain the CCE original position of determining the candidate PDCCH of each described polymerization grade correspondence among the common search space Common that detects or the user's particular search space UE-specific.
Be the polymerization grade of candidate PDCCH position calculation unit 105 according to 103 indications of state-maintenance unit, search volume, 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, separate rate-matched 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 the PDCCH data and the length of buffer memory.
This data cached reading unit 106 reads the PDCCH data of buffer memory according to the effective CCE original position and the polymerization grade of state-maintenance unit, search volume 103 indication, and the data of reading and length is sent into separate rate-matched and decoding unit 107.
Separate rate-matched and decoding unit 107, be used for up-downgoing dispatch state according to current RNTI, described PDCCH data to buffer memory are separated rate-matched 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 separates the indication according to up-downgoing dispatch state maintenance unit 104 of rate-matched and decoding unit 107, and the data cached rate-matched of separating that reads is handled with decoding.
CRC descrambling and decision unit 108 are used for the up-downgoing dispatch state according to current RNTI, and the not detected DCI of described up-downgoing dispatch state correspondence is carried 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 of each polymerization grade correspondence limited within the specific limits, to avoid under the same polymeric grade, same CCE original position is repeated to detect, promptly 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 the method and apparatus of the disclosed a kind of LTE of being used for PDCCH blind Detecting control by the invention described above, can reduce the number of times of PDCCH blind check effectively, reduce the number of times of same position duplicate detection, reduce the probability of flase drop, reduce operand and search time, thereby realize reducing 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 all 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 embodiment disclosed method, 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 conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. the blind check control method of a LTEPDCCH is characterized in that, comprising:
Obtain the physical resource CCE number that physical downlink control channel PDCCH takies, initialization is carried out in whole PDCCH search volume, and calculate the scope of the polymerization grade that detects according to described CCE number;
In the scope of described polymerization grade, calculate the candidate PDCCH number of each polymerization grade correspondence of public Common search volume and user particular UE-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 Channel 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 dividing in advance then 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, then reach the described polymerization rate range of determining from big extremely little priority orders according to described polymerization grade, 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,, read the PDCCH data of buffer memory according to described CCE original position and corresponding described polymerization grade;
According to the up-downgoing dispatch state of current RNTI, the described PDCCH data of buffer memory are separated rate-matched 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 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, the status indication that does not have CCE is for detecting DCI in described CCE original position, and 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. according to the described method of claim 1, it is characterized in that, 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 judge then whether the current search space is detected to finish;
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, then return execution according to the relation that RNTI and up-downgoing DCI divide in advance, determine this step of UE-specific search volume that detects; If not, then finish whole blind check control procedure.
4. according to any described method in the claim 1～3, it is characterized in that 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. according to any described method in the claim 1～3, it is characterized in that the process of the candidate PDCCH number of each polymerization grade correspondence comprises in described calculating Common and the UE-specific search volume:
Determine the search volume of the current polymerization grade correspondence that detects successively, obtain the candidate PDCCH number that comprises in the polymerization grade of current search space correspondence;
Judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to current search space correspondence of described candidate PDCCH number;
If 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 to obtain 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 to receive described polymerization rate range, the universal space Common in the calculating search volume and the candidate PDCCH number of each polymerization grade correspondence of user's particular space UE-specific;
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 Channel 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 Channel 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 big to little priority orders, obtain the CCE original position of determining the candidate PDCCH of each described polymerization grade correspondence in the Common search volume detected or the UE-specific search volume;
Data cached reading unit is used for when described CCE original position is effective, according to corresponding described polymerization grade, reads the PDCCH data and the length of buffer memory;
Separate rate-matched and decoding unit, be used for up-downgoing dispatch state according to current RNTI, described PDCCH data to buffer memory are separated rate-matched 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 of described up-downgoing dispatch state correspondence is carried 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 to receive 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 to receive 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:
First update module in the state-maintenance unit, described search volume is used to receive the feedback result of described CRC descrambling and judgement, upgrades current Common that detects or UE-specific search volume according to described feedback result;
Second update module in the described up-downgoing dispatch state maintenance unit is used to receive the feedback result of described CRC descrambling and judgement, upgrades the up-downgoing dispatch state of current described RNTI according to described feedback result.
9. according to any described device in the claim 6～8, it is characterized in that, also comprise in the described polymerization rate range computing unit:
Computing module is used to calculate the CCE number that the whole PDCCH of current subframe search volume takies;
Whether first judge module is used to judge described CCE number more than or equal to 8, if determine that then the scope of the polymerization grade that detects is: and 1,2,4,8}; If not, then enter second judge module;
Whether second judge module is used to judge described CCE number less than 8, more than or equal to 4, if determine that then the scope of the polymerization grade that detects is: and 1,2,4}; If not, then enter the 3rd judge module;
Whether the 3rd judge module is used to judge described CCE number less than 4, more than or equal to 2, if determine that then the scope of the polymerization grade that detects is: and 1,2}; If not, the scope of then determining the polymerization grade that detects is: { 1}.
10. according to any described device in the claim 6～8, it is characterized in that, also comprise in the described candidate PDCCH number computing unit:
Acquisition module is used for the search volume of definite current polymerization grade correspondence that detects successively, obtains the candidate PDCCH number that comprises in the polymerization grade of current search space correspondence;
The 4th judge module, be used to judge whether initialized candidate PDCCH number in the polymerization grade more than or equal to current search space correspondence of described candidate PDCCH number, if 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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