CN101594205B - Method for transmitting downlink control signaling of LTE-Advanced system - Google Patents
Method for transmitting downlink control signaling of LTE-Advanced system Download PDFInfo
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Abstract
The invention discloses a method for transmitting downlink control signaling of a LTE-Advanced system and aims to effectively reduce the frequency of a UE blind test. The method comprises the following steps: carrying out first cascade connection of CRC check codes of special DCI and the downlink control signaling; masking the CRC check codes by using RNTI of the UE to obtain a cascade connection mask sequence; coding indication information of the special DCI to obtain a special DCI indication information coding sequence; carrying out coding and speed matching of the cascade connection mask sequence to obtain a cascade connection mask coding sequence; carrying out second cascade connection and reordering of the special DCI indication information coding sequence and the cascade connection mask coding sequence to obtain an information block corresponding to a PDCCH of the UE; and processing and mapping the information blocks of a plurality of PDCCHs of a subframe to resource elements for transmitting. The technical proposal reduces the frequency of the UE blind test, the implementation complexity of UE and the probability of CRC false detection.
Description
Technical field
The present invention relates to field of mobile wireless communication, particularly relate to the descending control signaling sending method of a kind of senior Long Term Evolution (LTE-Advanced) system.
Background technology
Fig. 1 (a) and Fig. 1 (b) show respectively Long Term Evolution (Long Term Evolution, LTE) system Frequency Division Duplexing (FDD) (Frequency Division Duplex, FDD) frame structure of pattern and time division duplex (TimeDivision Duplex, TDD) pattern.
In the frame structure of the fdd mode shown in Fig. 1 (a), the radio frames (radioframe) of a 10ms is 0.5ms by 20 length, time slot (slot) composition of numbering 0～19, subframe (subframe) i that time slot 2i and 2i+1 composition length are 1ms.
In the frame structure of the tdd mode shown in Fig. 1 (b), the radio frames (radioframe) of a 10ms is made up of two long fields (half frame) for 5ms, and a field comprises 5 long subframes (subframe) for 1ms.Subframe i is defined as 2 long time slot 2i and 2i+1 for 0.5ms.
In two kinds of frame structures, for standard cyclic prefix (Normal Cyclic Prefix, Normal CP), a time slot comprises the symbol that 7 length are 66.7us, wherein the CP length of first symbol is 5.21us, and the CP length of all the other 6 symbols is 4.69us; For expansion (Extended) CP, a time slot comprises 6 symbols, and the CP length of all symbols is 16.67us.
LTE has defined following three kinds of downlink physical control channels, respectively Physical Control Format Indicator Channel (Physical control format indicator channel, PCFICH), physical mixed ARQ indicating channel (Physical hybrid ARQ indicator channel, and Physical Downlink Control Channel (Physical downlink control channel PHICH), PDCCH), wherein:
PCFICH, instruction for transmitting the information of number of OFDM symbol of PDCCH, sends in a subframe on first OFDM symbol of subframe, and place frequency location is determined by system descending bandwidth and community ID;
PHICH, the ACK/NACK feedback information of the H-ARQ of uplink, the number of PHICH and time-frequency position can be determined by the system message in PBCH and community ID;
PDCCH, includes uplink and downlink schedule information, uplink power control information etc.; The form (format) of Downlink Control Information (Downlink Control Information, DCI) is divided into following several: DCI format 0 is for the scheduling of Physical Uplink Shared Channel (PUSCH); DCI format 1,1A, 1B, 1C, 1D is for the different mode of a physical down link sharing channel (PDSCH) code word scheduling; DCI format 2,2A is for the different mode of space division multiplexing; DCI format 3,3A is for the different mode of the power control instruction of Physical Uplink Control Channel (PUCCH) and PUSCH.
The physical resource of PDCCH transmission is with control channel unit (control channel element, CCE) be unit, the size of a CCE is 9 resource unit group (Resource Element Group, REG), i.e. 36 Resource Element, a PDCCH may take 1,2,4 or 8 CCE.
For four kinds of PDCCH sizes of 1,2,4,8 CCE, adopt tree-shaped polymerization (Aggregation), that is: the PDCCH of a CCE can be from any CCE position; The PDCCH of two CCE is from even number CCE position; The CCE position of the integral multiple of the PDCCH of four CCE since four; The CCE position of the integral multiple of the PDCCH of eight CCE since eight.
Each polymerization rank (Aggregation level) search volume of definition (Search space), comprise the search volume of public (common) and subscriber equipment (User Equipment, UE) proprietary (UE Specific).The CCE number of whole search volume, is determined by the shared OFDM symbolic number in the controlled area of PCFICH instruction in each descending subframe and the group number of PHICH.UE carries out blind Detecting by the DCI format of transmission mode of living in to all possible PDCCH code checks in search volume.
UE, by the semi-static a kind of transmission mode (transmission mode) being set to based on following of high-level signaling (semi-statically), receives PDSCH transfer of data according to the instruction of the PDCCH of the search volume of UE specific:
(1) single antenna port; Port 0 (Single-antenna port; Port 0)
(2) transmit diversity (Transmit diversity)
(3) Open-Loop Spatial Multiplexing (Open-loop spatial multiplexing)
(4) Closed-Loop Spatial Multiplexing (Closed-loop spatial multiplexing)
(5) multiuser MIMO (Multi-user MIMO)
(6) closed loop Rank=1 precoding (Closed-loop Rank=1 precoding)
(7) single antenna port; Port 5 (Single-antenna port; Port 5)
If UE is set to Cell Radio Network Temporary Identifier/Identity, Cell-RNTI number (cell Radio NetworkTemporary Identifier by high level, C-RNTI) cyclic redundancy check (CRC) of scrambling (CRC) is carried out PDCCH decoding, and UE should be according to the respective sets incompatible decoding PDCCH and all relevant PDSCH that define in table 1-1.
If UE is set to semi-persistent scheduling Cell Radio Network Temporary Identifier/Identity, Cell-RNTI number (semi-persistently Scheduled Radio Network Temporary Identifier by high level, SPS-RNTI) CRC of scrambling carries out PDCCH decoding, and UE should be according to the respective sets incompatible decoding PDCCH and all relevant PDSCH that define in table 1-2.
PDCCH and PDSCH that table 1-1:C-RNTI arranges
PDCCH and PDSCH that table 1-2:SPS C-RNTI arranges
UE should be at each non-discontinuous reception (non-Discontinuous Reception, non-DRX) PDCCH that subframe detects one group of candidate is to obtain control information, and detection refers to according to all DCI format to be detected decodes to the PDCCH in group.It is respectively that 4 and 8 common search space and aggregation level are respectively 1,2,4,8 UE-specific search space that UE should detect an aggregation level.Common and UE-specific searchspace may be overlapping.The search space of aggregation level definition is as shown in table 1-3.The DCI format that UE should detect depends on the transmission mode of above-mentioned setting.
Table 1-3:UE candidate PDCCH to be checked
The interleaver of PDCCH: PDCCH is being mapped to before physical resource and will interweaving, and the interleaver using is called sub-block interleaver (sub-block interleaver), in 36.212 5.1.4.1.1, defines.
The sequence of input is designated as d
0 (i), d
1 (i), d
2 (i)..., d
d-1 (i), wherein D is bit number.
The bit sequence of output is derived by following manner:
(1) order
For matrix column number, matrix column is from left to right numbered and is followed successively by 0,1,2 ..., C
subblock tC-1.
(2) determined the line number R of matrix by following formula
subblock tC, R
subblock tCfor meeting the integer of following formula minimum:
The row of matrix is numbered and is followed successively by 0,1,2 from top to bottom ..., R
subblock tC-1.
(3) if
Add
Individual puppet (dummy) bit, makes yk=<NULL>for k=0, and 1 ..., ND-1; By list entries
K=0,1 ..., D-1,0 row 0 row, writes matrix (R from y0 line by line
subblock tC× C
subblock tC):
(4) according to the pattern of table 5.1.4-1 definition
exchange between being listed as, P (j) is former column position;
Card (R
subblock tC× C
subblock tC) be:
(5) output sequence of interleaver is the matrix (R from exchange
subblock tC× C
subblock tC) read by column, if yk=<NULL> rejects this bit.
Table 5.1.4-1 Inter-column permutation pattern for sub-block interleaver
| Number of columns C subblock TC | Inter-column permutation pattern <P(0)，P(1)，...，P(C subblock TC-1)> |
| 32 | <0，16，8，24，4，20，12，28，2，18，10，26， 6，22，14，30，1，17，9，25，5，21，13，29，3， 19，11，27，7，23，15，31> |
LTE Release-8 has defined 6 kinds of bandwidth: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz.Advanced long-term evolution system (Further Advancements for E-UTRA, LTE-Advanced) is the evolution version of LTE Release-8.Except meeting or exceeding 3GPP TR25.913: all related needs of " Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) ", also will meet or exceed the demand of the IMT-Advanced of ITU-R proposition.Wherein, refer to the demand of LTE Release-8 backward compatibility: the subscriber equipment of LTERelease-8 can be worked in the network of LTE-Advanced; The subscriber equipment of LTE-Advanced can be worked in the network of LTE Release-8.In addition, LTE-Advanced should be able to be at the spectrum disposition of different sizes, comprises work under the spectrum disposition wider than LTE Release-8 (as the continuous frequency spectrum resource of 100MHz), to reach higher performance and target peak speed.Consider and the compatibility of LTE Release-8, for the bandwidth that is greater than 20MHz, adopt the mode of Carrier aggregation, that is:
(1) two or more component carriers (component carriers) are assembled the downstream transmission bandwidth to support to be greater than 20MHz.
(2) subscriber equipment can receive one or more component carriers by its ability simultaneously.
(3) there is the LTE-A subscriber equipment that exceedes 20MHz receiving ability can receive the transmission on multiple component carriers simultaneously.LTE Rel-8 subscriber equipment can only receive the transmission on one-component carrier wave, as the structure of this component carrier is followed Rel-8 specification.
At present, the form that is PDCCH for the transmission of descending control signaling in LTE-Advanced standard is reached following common recognition:
(1), based on the DCI format form of (wherein comprising the carrier wave indicator field (carrierindicator) of 0-3bit), descending distribution (DL assignment) and uplink authorization (UL grant) to each component carrier are encoded separately;
(2) in the time that the figure place of carrier wave indicator field is 0, carrier wave indicating device does not exist.
LTE-A needs new DCI format to support coordinated multipoint transmission (CoMP), and high-order mimo, strengthens wave beam and form the new features such as (beamforming) and multiuser MIMO (MU-MIMO).In addition, uplink single user MIMO (SU-MIMO) also may need independent DCI format (potentiallyof new size), and even the PRB allocation of upstream discontinuous also needs to change DCI format.If adopt the PDCCH detection mode that is similar to R8, even new DCI format means single carrier scheduling, also need more blind check number of times, unless also meaned that more transmission mode--the DCI format of different transmission schemes has identical size simultaneously.If do not add any restriction, Zong blind check number of times increases with bandwidth is linear, as 5 required blind check number of times of carrier are at least 44*5=220 time, the realization of UE has larger complexity.
Except realization has larger complexity, the PDCCH detection mode that LTE-A continues to use Rel-8 has following shortcoming:
(1) using size as the benchmark of distinguishing DCI format, thereby compromise between the size that usually need to mate in new control information with mutually, cause the DCI format scheme of suboptimum;
(2) number of times of blind check equals the product of searching position and DCI format quantity, and the increase of DCI format will cause the remarkable increase of blind check number of times;
(3), because every subframe need to be carried out more blind check, cause average CRC false-alarm (false positiveCRC checks) time decreased; False-alarm can cause transmission and the undelegated uplink of the upper ACK/NACK of wrong PUCCH;
(4) payload size of DCI format (Payload size) fuzzy problem; in Rel-8; filling bit (padding bits) is for avoiding fuzzy payload sizes; and for distinguishing different DCI format, and fill the loss that (padding) can cause PDCCH to cover conventionally.
(5) in addition, in LTE-A, may need to reduce the number of transmission mode, mean the switching of multiple DCI format under model identical.This will need descending control information format size (DCI formatsize) to keep good consistency, otherwise will increase significantly blind check number of times.
Visible, in LTE-A, continue to use the blind check mode of PDCCH in Rel-8, because required blind check number of times significantly increases, the implementation complexity to subscriber equipment, the degree of freedom of DCI format design, error performance and scheduling degree of freedom etc. have larger constraint.
At present, have a kind of scheme to address the above problem preferably, its basic ideas are as follows:
(1) in PDCCH, add format indicator (Format Indicator, FI) be DCI format indication information, 2～3bit, corresponding to 4～8 kinds of DCI format, adopt the piece coding that computational efficiency is high, code check relevant to aggregation level and fixing (irrelevant with the size of DCI format);
(2) code word after FI coding and the code word cascade after DCI format convolution coding; Being mapped to before CCE, adopt extra interleaver to make FI bit and DCI Bit Interleave to ensure the frequency diversity gain of FI;
(3) bit sequence of the calculating of CRC based on FI and DCI format composition, thereby CRC correctly represents that FI and DCI are correct.
But interleaver of the code word after the encoding scheme of the word length of this scheme to FI and related meanings, various word lengths, the code check of FI, FI coding and the code word after DCI format convolution coding etc. is gone back imperfection, can not meet the requirement that system realizes.
In view of this, industry urgently proposes a kind of descending control signaling sending method of LTE-Advanced system, effectively to reduce subscriber equipment blind check number of times.
Summary of the invention
Technical problem to be solved by this invention, is to provide a kind of descending control signaling sending method of LTE-Advanced system, effectively to reduce the blind check number of times of subscriber equipment.
In order to solve the problems of the technologies described above, the invention provides a kind of descending control signaling sending method of advanced long-term evolution system, the proprietary Downlink Control Information that described descending control signaling comprises subscriber equipment and proprietary Downlink Control Information indication information, the method comprises:
The cyclic redundancy check (CRC) code of described proprietary Downlink Control Information and described descending control signaling is carried out to the first cascade;
Use the Radio Network Temporary Identifier number of described subscriber equipment to carry out mask operation to described cyclic redundancy check (CRC) code, obtain cascade mask code sequence;
Bit sequence to described proprietary Downlink Control Information indication information is encoded, and obtains proprietary Downlink Control Information indication information coded sequence;
Described cascade mask code sequence is encoded and rate-matched, obtain cascade mask coded sequence;
Described proprietary Downlink Control Information indication information coded sequence and cascade mask coded sequence are carried out to the second cascade, to the sequence rearrangement after described the second cascade, obtain a block of information corresponding to Physical Downlink Control Channel of described subscriber equipment;
After the block of information of the multiple Physical Downlink Control Channel in a subframe is processed, being mapped to resource element sends.
Preferably, the cyclic redundancy check (CRC) code of described descending control signaling, is the cyclic redundancy check (CRC) code of described proprietary Downlink Control Information; Or the cyclic redundancy check (CRC) code of described proprietary Downlink Control Information indication information and described proprietary Downlink Control Information modular cascade sequence.
Preferably, described mask is operating as described Radio Network Temporary Identifier number and cyclic redundancy check (CRC) code is carried out mould 2 add operations of corresponding position.
Preferably, use described proprietary Downlink Control Information indication information and Radio Network Temporary Identifier number to carry out described mask operation to described cyclic redundancy check (CRC) code;
Described mask is operating as described Radio Network Temporary Identifier number and carries out mould 2 add operations of corresponding position with described cyclic redundancy check (CRC) code, and the described proprietary Downlink Control Information indication information of n position participates in described mould 2 add operations of n position after described Radio Network Temporary Identifier number and described cyclic redundancy check (CRC) code.
Preferably, described proprietary Downlink Control Information indication information, is type or the size of described proprietary Downlink Control Information.
Preferably, the length of described proprietary Downlink Control Information indication information, is 1,2 or 3 bits, wherein:
While being 1 bit, described proprietary Downlink Control Information indication information is used to indicate descending assignment information or uplink authorization information, or two kinds of descending control information format sizes;
While being 2 bit, described proprietary Downlink Control Information indication information is used to indicate 4 kinds of descending control information format sizes or 4 kinds of descending control information format sizes;
While being 3 bit, described proprietary Downlink Control Information indication information is used to indicate 8 kinds of descending control information formats or 8 kinds of descending control information format sizes.
Preferably, when the length of described proprietary Downlink Control Information indication information is 1 bit, the bit sequence of described proprietary Downlink Control Information indication information is carried out to repeated encoding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, the code length of described proprietary Downlink Control Information indication information coding is respectively 4,8,16 or 24 accordingly, and code check is respectively 1/4,1/8,1/16 or 1/24 accordingly; Or code length is respectively 3,6,12 or 18 accordingly, code check is respectively 1/3,1/6,1/12 or 1/18 accordingly;
When the length of described proprietary Downlink Control Information indication information is 2 bit, the bit sequence of described proprietary Downlink Control Information indication information is carried out to (2 of repetition, 3) code coding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, the code length of described proprietary Downlink Control Information indication information coding is respectively 6,12,24 or 36 accordingly, and code check is respectively 1/3,1/6,1/12 or 1/18 accordingly; Or code length is respectively 4,8,16 or 32 accordingly, code check is respectively 1/2,1/4,1/8 or 1/16 accordingly;
When the length of described proprietary Downlink Control Information indication information is 3 bit, the bit sequence of described proprietary Downlink Control Information indication information is carried out to Hamming code coding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, the code length of described proprietary Downlink Control Information indication information coding is respectively 6,18,36 or 48 accordingly, and code check is respectively 1/2,1/6,1/12 or 1/16 accordingly; Or code length is respectively 5,9,18 or 36 accordingly, code check is respectively 3/5,1/3,1/6 or 1/12 accordingly.
Preferably, the length of described cyclic redundancy check (CRC) code, is 16,18,20 or 24 bits, wherein:
While being 16 bit, described cyclic redundancy check (CRC) code generator polynomial is G (D)=[D16+D12+D5+1];
While being 18 bit, described cyclic redundancy check (CRC) code generator polynomial is G (D)=[D18+D17+D15+D9+D7+D6+D5+D4+D3+1];
While being 20 bit, described cyclic redundancy check (CRC) code generator polynomial is G (D)=[D20+D18+D17+D14+D12+D10+D8+D7+D2+1];
While being 24 bit, described cyclic redundancy check (CRC) code generator polynomial is G (D)=[D
24+ D
23+ D
6+ D
5+ D+1].
Preferably, to the cyclic redundancy check (CRC) code after described proprietary Downlink Control Information and the operation of described mask, sting tail convolutional encoding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, and the code length of proprietary Downlink Control Information and cyclic redundancy check (CRC) code coding is that the bit length of the Physical Downlink Control Channel that can carry in corresponding control channel unit polymerization rank deducts the code length after the proprietary Downlink Control Information indication information of described control channel unit polymerization rank is encoded.
Preferably, the code length of proprietary Downlink Control Information and cyclic redundancy check (CRC) code coding is 68,136,272 or 552 accordingly.
Preferably, to the sequence after described the second cascade, carry out described rearrangement according to the mode of sub-block interleaver definition; Or
Dibit 2 tuples of composition and every bit adjacent in sequence after described the second cascade are only combined once, then all 2 tuple orders are formed to a group sequence, according to the mode of sub-block interleaver definition, described group of sequence carried out to described rearrangement again, 2 tuples replace a bit in sub-block interleaver.
Compared with prior art, technical scheme of the present invention, reduce the number of times of subscriber equipment blind check, reduce the implementation complexity of subscriber equipment, reduce the probability of CRC flase drop, improved the degree of freedom of DCI format design and the flexibility of system call, solved the transmission problem of Carrier aggregation Downlink Control Information, the compatibility that is conducive to LTE-Advanced and LTE Release-8, is conducive to the realization of LTE-Advanced system.
Brief description of the drawings
Fig. 1 (a) is the frame structure schematic diagram of LTE system fdd mode;
Fig. 1 (b) is the frame structure schematic diagram of LTE system TDD mode;
Fig. 2 is the schematic flow sheet of the inventive method embodiment;
Fig. 3 is series of operations schematic diagram corresponding to embodiment of the method shown in Fig. 2.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, to the present invention, how application technology means solve technical problem whereby, and the implementation procedure of reaching technique effect can fully understand and implement according to this.
Core concept of the present invention is, descending control signaling comprises proprietary DCI information and the proprietary DCI indication information of UE, the bit sequence of proprietary DCI information is added to CRC check code, complete the first cascade between proprietary DCI information and CRC check code, and the Radio Network Temporary Identifier number (RNTI) that uses UE carries out mask operation to the CRC check code after cascade and obtains cascade mask code sequence; The bit sequence of proprietary DCI indication information is encoded and obtained proprietary DCI indication information coded sequence, and this cascade mask code sequence is encoded and obtained cascade mask coded sequence with rate-matched; This proprietary DCI indication information coded sequence and this cascade mask coded sequence are carried out to the second cascade, and to the sequence rearrangement after the second cascade, obtain the block of information that PDCCH is corresponding of UE; After the block of information of multiple PDCCH in a subframe is processed, being mapped to resource element (resource element, RE) sends.
Fig. 2 is the schematic flow sheet of the inventive method embodiment, and Fig. 3 is series of operations schematic diagram corresponding to embodiment of the method shown in Fig. 2.Refer to Fig. 3, the method embodiment shown in Fig. 2 mainly comprises the steps:
Step S210, carries out the first cascade to the CRC check code of proprietary DCI information and descending control signaling;
Step S220, uses the RNTI of UE to carry out mask operation to CRC check code, obtains cascade mask code sequence;
Step S230, encodes to the bit sequence of proprietary DCI indication information, obtains proprietary DCI indication information coded sequence;
Step S240, encodes and rate-matched to cascade mask code sequence, obtains cascade mask coded sequence;
Step S250, carries out the second cascade to proprietary DCI indication information coded sequence and cascade mask coded sequence, to the sequence rearrangement after the second cascade, obtains a block of information corresponding to PDCCH of UE;
Step S260, is mapped to resource element after the block of information of the multiple PDCCH in a subframe is processed and sends.
Wherein, can also further add the bit sequence of proprietary DCI indication information to the bit sequence of proprietary DCI information, also i.e. this first cascade is to carry out for the bit sequence of the bit sequence of proprietary DCI information, proprietary DCI indication information and the CRC check code of descending control signaling.Now, mask is wherein operating as the RNTI of UE and mould 2 add operations that CRC check code corresponds to.
Or, can use the RNTI of proprietary DCI indication information and UE, CRC check code after proprietary DCI information and the first cascade of CRC check code is carried out to mask operation, the RNTI that now mask is operating as UE carries out mould 2 add operations of corresponding position with CRC check code, and the proprietary DCI indication information of n position participates in mould 2 add operations of n position after this RNTI and CRC check code.
Further illustrate type or size that proprietary DCI indication information can be proprietary DCI information.
Further illustrate the one in desirable 1,2 or 3 bits of length of proprietary DCI indication information; While wherein getting 1 bit, this DCI indication information is used to indicate up/down row DCI format or two kinds of DCIformat size; While getting 2 bit, this DCI indication information is used to indicate 4 kinds of DCI format or 4 kinds of DCIformat size; While getting 3 bit, this DCI indication information is used to indicate 8 kinds of DCI format or 8 kinds of DCIformat size.
Further illustrate, the length of above-mentioned CRC check code is 16 bits, and generator polynomial is G (D)=g
cRC16(D)=[D
16+ D
12+ D
5+ 1]; Or the length of above-mentioned CRC check code is 18 bits, generator polynomial is G (D)=g
cRC18(D)=[D
18+ D
17+ D
15+ D
9+ D
7+ D
6+ D
5+ D
4+ D
3+ 1]; Or the length of above-mentioned CRC check code is 20 bits, generator polynomial is G (D) g
cRC20(D)=[D
20+ D
18+ D
17+ D
14+ D
12+ D
10+ D
8+ D
7+ D
2+ 1]; Or the length of above-mentioned CRC check code is 24 bits, generator polynomial is G (D)=g
cRC24(D)=[D
24+ D
23+ D
6+ D
5+ D+1].
The CRC check code of above-mentioned descending control signaling, can be the CRC check code of proprietary DCI information sequence, can be also the CRC check code of proprietary DCI indication information and proprietary DCI information modular cascade sequence.
Further illustrate, the above-mentioned bit sequence to descending control signaling adds CRC check code, and by the proprietary information of this UE, this CRC check code is carried out to mask operation, comprises two kinds of situations:
(1) bit sequence of proprietary DCI indication information and the cascade of proprietary DCI information is added to CRC check code, and with Radio Network Temporary Identifier number (the Radio Network TemporaryIdentifier of UE, RNTI) CRC check code is carried out to mask operation, mask operation refers to mould 2 add operations of RNTI and the corresponding position of CRC check code; Or
(2) bit sequence of proprietary DCI information is added to CRC check code, and carry out the mask operation of CRC with the RNTI of UE, or CRC check code is carried out to mask operation by RNTI sequence and the proprietary DCI indication information sequence of UE simultaneously, mask operation is exactly that RNTI and CRC check code carry out mould 2 add operations of corresponding, and the proprietary DCI indication information of n position participates in mould 2 add operations of n position after RNTI and CRC check code.
Further illustrate, when the length of proprietary DCI indication information is 1 bit, adopt repeated encoding; When the length of proprietary DCI indication information is 2 bit, adopt (2,3) code coding repeating; When the length of proprietary DCI indication information is 3 bit, adopt Hamming code to encode.
Further illustrate, the code length after proprietary DCI indication information coding, defines according to the CCEaggregation level of PDCCH, wherein:
When the length of proprietary DCI indication information is 1 bit, be 1,2,4 or 8 o'clock for the CCE aggregationlevel of PDCCH, code length after its coding is respectively 4,8,16 or 24 accordingly, and corresponding code check is respectively 1/4,1/8,1/16 or 1/24 accordingly; Or the code length after its coding is respectively 3,6,12 or 18 accordingly, corresponding code check is respectively 1/3,1/6,1/12 or 1/18 accordingly;
When the length of proprietary DCI indication information is 2 bit, be 1,2,4 or 8 o'clock for the CCE aggregationlevel of PDCCH, code length after its coding is respectively 6,12,24 or 36 accordingly, and corresponding code check is respectively 1/3,1/6,1/12 or 1/18 accordingly; Or the code length after its coding is respectively 4,8,16 or 32 accordingly, corresponding code check is respectively 1/2,1/4,1/8 or 1/16 accordingly;
When the length of proprietary DCI indication information is 3 bit, be 1,2,4 or 8 o'clock for the CCE aggregationlevel of PDCCH, code length after its coding is respectively 6,18,36 or 48 accordingly, and corresponding code check is respectively 1/2,1/6,1/12 or 1/16 accordingly; Or the code length after its coding is respectively 5,9,18 or 36 accordingly, corresponding code check is respectively 3/5,1/3,1/6 or 1/12 accordingly.
Further illustrate, the bit sequence of the CRC check code cascade after above-mentioned proprietary DCI information and mask operation, adopt tail-biting convolutional code coding (Tail biting convolutional coding) and carry out rate-matched, be 1,2,4 or 8 o'clock for the CCE aggregation level of the PDCCH of this UE, the code length after its coding is that the bit length of the PDCCH that can carry in corresponding CCE aggregation level deducts the code length after the proprietary DCI indication information of this CCE aggregation level is encoded.
Further illustrate, after the bit sequence cascade after above-mentioned will coding, resequence, can be by the mode that the bit sequence of cascade after above-mentioned coding is defined according to sub-block interleaver, to exporting after this sequence rearrangement; Or the bit sequence cascade after coding is obtained to sequence f '
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1, definition 2 tuple Z (i/2)=<a
i, a
i+1>, i=0,2,4 ..., L-1, then by 2 tuple sequence Z (0), Z (1) ... Z ((L-1)/2) according to the mode of sub-block interleaver definition to this sequence rearrangement.Wherein 2 tuples are by sequence a
0, a
1... a
l-1adjacent every two bit are divided into one group and every bit and only combine once, then by these group serial numbers and be cascaded as a group sequence.In sub-blockinterleaver, replace bit to carry out exporting after associative operation with 2 tuples.
About proprietary DCI information is stung to tail convolutional encoding and rate-matched, in LTE 36.212 standards, there is clear and definite regulation.In brief, adopt tail-biting convolutional code encoder to obtain 3 code streams by 1/3 code check coding to proprietary DCI information, while carrying out rate-matched, 3 each personal sub-blockinterleaver of code stream are interweaved, then input according to the order of sequence in a virtual Circular buffer device, according to the code check of actual needs, in annular buffer, select corresponding code word as output again.The object of rate-matched is that the proprietary DCI information in order to make different length can be encoded and speed adjustment by identical mode.
In the time resequencing, after cascade mask code sequence after CRC check code cascade after the operation of the bit sequence of proprietary DCI information and mask is encoded, the length of the cascade mask coded sequence after the processing of rate-matched makes coding equals total length that each Aggregation level can hold and deducts poor for the length of proprietary DCI indication information.
The first embodiment
When proprietary DCI indication information FI is 1bit, value 0/1 is indicated respectively DL assignment/ULgrant.Now proprietary DCI indication information is actual is the type of proprietary DCI information.
The information bit sequence a of DCI format
0, a
1..., a
a-1the indication information bit sequence f of (A is positive integer) and this DCI format
0carry out the first cascade, obtain sequence f
0, a
0, a
1... a
a-1, wherein, the information of DCIformat is aforesaid proprietary DCI information.
Use CRC check code generator polynomial g
cRC16(D)=[D
16+ D
12+ D
5+ 1] situation can be as lower one:
(1) to sequence f
0, a
0, a
1... a
a-1add CRC check position, calling sequence f
0, a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use the 16bit RNTI of UE to carry out mask operation to CRC check code, obtain sequence f
0, a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein l '
k=(l
k+ x
k) mod 2, k=0,1,2 ..., 15, x
0, x
1..., x
15for the RNTI of UE;
(2) to sequence a
0, a
1... a
a-1add CRC check position, calling sequence a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use the 16bit RNTI of UE to carry out mask operation to CRC check code, obtain sequence a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein l '
k=(l
k+ x
k) mod 2, k=0,1,2 ..., 15, x
0, x
1..., x
15for the RNTI of UE;
(3) to sequence a
0, a
1... a
a-1add CRC check position, calling sequence a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use 16bit RNTI and the f of UE
0cRC check code is carried out to mask operation, obtain sequence a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein:
To f
0adopt duplication code to encode, the sequence obtaining after coding is f '
0, f '
1, f '
2... f '
m-1, for PDCCH CCE aggregation level 1,2,4 or 8, no matter which kind of DCI format that instruction is, M=4,8,16 or 24 accordingly.A
0, a
1... a
a-1, l '
0, l '
1... l '
15adopt stinging tail convolutional encoding (Tail biting convolutional coding) and carrying out obtaining coded sequence a ' after rate-matched of LTE Rel-8
0, a '
1... a '
n-1, for PDCCH CCE aggregation level 1,2,4 or 8, accordingly N=68,136,272 or 552.It should be noted that proprietary DCI indication information is only encoded, its code check is fixed.
Two sequences after coding are carried out to the second cascade, obtain the sequence f ' after the second cascade
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1, then:
According to the mode of sub-block interleaver definition, to this sequence f '
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1output after rearrangement; Or
Define 2 tuple sequence <f '
0, f '
1>, <f '
2, f '
3> ... <f '
m-2, f '
m-1>, <a '
0, a '
1>, <a '
2, a '
3> ... <a '
n-2, a '
n-1>, according to the mode of sub-block interleaver definition, to this 2 tuple sequence rearrangement, wherein replaces bit to carry out exporting after associative operation with 2 tuples in sub-blockinterleaver.
The sequence of output is a block of information corresponding to PDCCH of LTE-A UE.
By the mode defining in LTE Rel-8, the block of information of the multiple PDCCH in a subframe is carried out, after multiplexing and scrambling, modulation, layer mapping and precoding, being mapped to resource element (resource element, RE) and sending.
The second embodiment
When FI is 2bit, value 00,01,10,11 indicate respectively a kind of DCI format or a kind of DCI format size, and wherein FI is aforesaid proprietary DCI indication information.Now, proprietary DCI indication information is actual is type or the size of proprietary DCI information.
The information bit sequence a of DCI format
0, a
1..., a
a-1the indication information bit sequence f of (A is positive integer) and this DCI format
0f
1carry out the first cascade, obtain sequence f
0, f
1, a
0, a
1... a
a-1, wherein, the information of DCIformat is aforesaid proprietary DCI information.
Use CRC check code generator polynomial g
cRC16(D)=[D
16+ D
12+ D
5+ 1] situation can be as lower one:
(1) to sequence f
0, f
1, a
0, a
1... a
a-1add CRC check position, calling sequence f
0, f
1, a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use the 16bit RNTI of UE to carry out mask operation to CRC check code, obtain sequence f
0, f
1, a
0, a
1... a
a-1, l '
0, l '
1... l '
15; Wherein l '
k=(l
k+ x
k) mod 2, k=0,1,2 ..., 15, x
0, x
1..., x
15for the RNTI of UE;
(2) to sequence a
0, a
1... a
a-1add CRC check position, calling sequence a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use the 16bit RNTI of UE to carry out mask operation to CRC check code, obtain sequence a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein l '
k=(l
k+ x
k) mod 2, k=0,1,2 ..., 15, x
0, x
1..., x
15for the RNTI of UE;
(3) to sequence a
0, a
1... a
a-1add CRC check position, calling sequence a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use 16bit RNTI and the f of UE
0f
1cRC check code is carried out to mask operation, obtain sequence a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein:
To f
0f
1adopt (2,3) code encode and carry out repetition, to obtain required code check, establish (2,3) code and adopt following coded system: 00-011,01-101,10-110,11-000.F
0f
1after encoding and repeating, obtain sequence f '
0, f '
1, f '
2..., f '
m-1.To PDCCH CCE aggregation level 1,2,4 or 8, no matter which kind of DCI format that instruction is, M gets respectively 6,12,24 or 36 accordingly.A
0, a
1... a
a-1, l '
0, l '
1... l '
15adopt stinging tail convolutional encoding (Tail biting convolutional coding) and carrying out obtaining coded sequence a ' after rate-matched of LTE Rel-8
0, a '
1... a '
n-1, for PDCCH CCE aggregation level 1,2,4 or 8, accordingly N=66,132,264 or 540.It should be noted that proprietary DCI indication information is only encoded, its code check is fixed.
Two sequences after coding are carried out to the second cascade, obtain the sequence f ' after the second cascade
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1, then:
According to the mode of sub-block interleaver definition, to this sequence f '
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1output after rearrangement; Or
Define 2 tuple sequence <f '
0, f '
1>, <f '
2, f '
3> ... <f '
m-2, f '
m-1>, <a '
0, a '
1>, <a '
2, a '
3> ... <a '
n-2, a '
n-1>, according to the mode of sub-block interleaver definition, to this 2 tuple sequence rearrangement, wherein replaces bit to carry out exporting after associative operation with 2 tuples in sub-blockinterleaver.
The sequence of output is a block of information corresponding to PDCCH of LTE-A UE.
Then by the mode defining in LTE Rel-8, the block of information of the multiple PDCCH in a subframe is carried out, after multiplexing and scrambling, modulation, layer mapping and precoding, being mapped to RE and sending.
The 3rd embodiment
When FI is 3bit, value 000～111, indicates respectively a kind of DCI format or a kind of DCI formatsize, and wherein FI is aforesaid proprietary DCI indication information.Now, proprietary DCI indication information is actual is type or the size of proprietary DCI information.
The information bit sequence a of DCI format
0, a
1..., a
a-1(A is positive integer) and this DCI format indication information bit sequence f
0f
1f
2carry out the first cascade, obtain sequence f
0, f
1, f
2, a
0, a
1... a
a-1, wherein, the information of DCI format is aforesaid proprietary DCI information.
Use CRC check code generator polynomial g
cRC16(D)=[D
16+ D
12+ D
5+ 1] situation can be following one:
(1) to sequence f
0, f
1, f
2, a
0, a
1, a
1... a
a-1add CRC check digit calling sequence f
0, f
1, f
2, a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use the 16bit RNTI of UE to carry out mask operation to CRC check code, obtain sequence f
0, f
1, f
2, a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein l '
k=(l
k+ x
k) mod 2, k=0,1,2 ..., 15, x
0, x
1..., x
15for the RNTI of UE;
(2) to sequence a
0, a
1... a
a-1add CRC check position, calling sequence a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use the 16bit RNTI of UE to carry out mask operation to CRC check code, obtain sequence a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein l '
k=(l
k+ x
k) mod 2, k=0,1,2 ..., 15, x
0, x
1..., x
15for the RNTI of UE;
(3) to sequence a
0, a
1... a
a-1add CRC check position, calling sequence a
0, a
1... a
a-1, l
0, l
1... l
15, wherein l
0, l
1... l
15for CRC check code; Use 16bit RNTI and the f of UE
0f
1f
2cRC check code is carried out to mask operation, obtain sequence a
0, a
1... a
a-1, l '
0, l '
1... l '
15, wherein:
(4) to f
0f
1f
2employing Hamming code coding, obtains sequence f '
0, f '
1, f '
2... f '
m-1; To PDCCH CCEaggregation level 1,2,4 or 8, no matter which kind of DCI format that instruction is, M gets respectively 6,18,36 or 48 accordingly; a
0, a
1... a
a-1, l '
0, l '
1... l '
15adopt stinging tail convolutional encoding (Tailbiting convolutional coding) and carrying out, after rate-matched, obtaining coded sequence a ' of LTE Rel-8
0, a '
1... a '
n-1, for PDCCH CCE aggregation level 1,2,4 or 8, accordingly N=66,126,252 or 528.It should be noted that proprietary DCI indication information is only encoded, its code check is fixed.
Two sequences are carried out to the second cascade, obtain the sequence f ' after the second cascade
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1, then:
According to the mode of sub-block interleaver definition, to sequence f '
0, f '
1, f '
2..., f '
m-1, a '
0, a '
1... a '
n-1output after rearrangement; Or
Define 2 tuple sequence <f '
0, f '
1>, <f '
2, f '
3> ... <f '
m-2, f '
m-1>, <a '
0, a '
1>, <a '
2, a '
3> ... <a '
n-2, a '
n-1>, according to the mode of sub-block interleaver definition, to this 2 tuple sequence rearrangement, wherein replaces bit to carry out exporting after associative operation with 2 tuples in sub-blockinterleaver.
The sequence of output is a block of information corresponding to PDCCH of LTE-A UE.
Then by the mode defining in LTE Rel-8, the block of information of the multiple PDCCH in a subframe is carried out, after multiplexing and scrambling, modulation, layer mapping and precoding, being mapped to RE and sending.
The present invention improves and improves prior art, for LTE-Advanced provides a kind of sending method of descending control signaling.The technical scheme of the inventive method, effectively reduce the number of times of subscriber equipment blind check, reduce preferably the implementation complexity of subscriber equipment, reduce the probability of CRC flase drop, the degree of freedom of DCI format design and the flexibility of system call are improved, solve preferably the transmission problem of Carrieraggregation Downlink Control Information, be conducive to the compatibility of LTE-Advanced and LTERelease-8, be conducive to the realization of LTE-Advanced system.
The above; be only preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, any those skilled in the art are in the disclosed technical scope of the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. a descending control signaling sending method for advanced long-term evolution system, the proprietary Downlink Control Information that described descending control signaling comprises subscriber equipment and proprietary Downlink Control Information indication information, is characterized in that, the method comprises:
The cyclic redundancy check (CRC) code of described proprietary Downlink Control Information and described descending control signaling is carried out to the first cascade;
Use the Radio Network Temporary Identifier number of described subscriber equipment to carry out mask operation to the cyclic redundancy check (CRC) code after described the first cascade, obtain cascade mask code sequence, wherein said mask is operating as mould 2 add operations;
Bit sequence to described proprietary Downlink Control Information indication information is encoded, and obtains proprietary Downlink Control Information indication information coded sequence;
Described cascade mask code sequence is encoded and rate-matched, obtain cascade mask coded sequence;
Described proprietary Downlink Control Information indication information coded sequence and cascade mask coded sequence are carried out to the second cascade, to the sequence rearrangement after described the second cascade, obtain a block of information corresponding to Physical Downlink Control Channel of described subscriber equipment, wherein, to the sequence after described the second cascade, mode according to the definition of sub-block interleaver is carried out described rearrangement, or dibit 2 tuples of composition and every bit adjacent in the sequence after described the second cascade are only combined once, then all 2 tuple orders are formed to a group sequence, according to the mode of sub-block interleaver definition, described group of sequence carried out to described rearrangement again, 2 tuples replace a bit in sub-block interleaver,
After the block of information of the multiple Physical Downlink Control Channel in a subframe is processed, being mapped to resource element sends.
2. the method for claim 1, is characterized in that:
The cyclic redundancy check (CRC) code of described descending control signaling is the cyclic redundancy check (CRC) code of described proprietary Downlink Control Information; Or the cyclic redundancy check (CRC) code of described proprietary Downlink Control Information indication information and described proprietary Downlink Control Information modular cascade sequence.
3. the method for claim 1, is characterized in that:
Use described proprietary Downlink Control Information indication information and Radio Network Temporary Identifier number to carry out described mask operation to described cyclic redundancy check (CRC) code;
Described mask is operating as described Radio Network Temporary Identifier number and carries out mould 2 add operations of corresponding position with described cyclic redundancy check (CRC) code, and the described proprietary Downlink Control Information indication information of n position participates in described mould 2 add operations of n position after described Radio Network Temporary Identifier number and described cyclic redundancy check (CRC) code.
4. the method as described in claim 1,2 or 3, is characterized in that:
Described proprietary Downlink Control Information indication information is type or the size of described proprietary Downlink Control Information.
5. method as claimed in claim 4, is characterized in that, the length of described proprietary Downlink Control Information indication information is 1,2 or 3 bits, wherein:
While being 1 bit, described proprietary Downlink Control Information indication information is used to indicate descending assignment information or uplink authorization information, or two kinds of descending control information format sizes;
While being 2 bit, described proprietary Downlink Control Information indication information is used to indicate 4 kinds of descending control information format sizes or 4 kinds of descending control information format sizes;
While being 3 bit, described proprietary Downlink Control Information indication information is used to indicate 8 kinds of descending control information formats or 8 kinds of descending control information format sizes.
6. method as claimed in claim 5, is characterized in that:
When the length of described proprietary Downlink Control Information indication information is 1 bit, the bit sequence of described proprietary Downlink Control Information indication information is carried out to repeated encoding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, the code length of described proprietary Downlink Control Information indication information coding is respectively 4,8,16 or 24 accordingly, and code check is respectively 1/4,1/8,1/16 or 1/24 accordingly; Or code length is respectively 3,6,12 or 18 accordingly, code check is respectively 1/3,1/6,1/12 or 1/18 accordingly;
When the length of described proprietary Downlink Control Information indication information is 2 bit, the bit sequence of described proprietary Downlink Control Information indication information is carried out to (2 of repetition, 3) code coding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, the code length of described proprietary Downlink Control Information indication information coding is respectively 6,12,24 or 36 accordingly, and code check is respectively 1/3,1/6,1/12 or 1/18 accordingly; Or code length is respectively 4,8,16 or 32 accordingly, code check is respectively 1/2,1/4,1/8 or 1/16 accordingly;
When the length of described proprietary Downlink Control Information indication information is 3 bit, the bit sequence of described proprietary Downlink Control Information indication information is carried out to Hamming code coding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, the code length of described proprietary Downlink Control Information indication information coding is respectively 6,18,36 or 48 accordingly, and code check is respectively 1/2,1/6,1/12 or 1/16 accordingly; Or code length is respectively 5,9,18 or 36 accordingly, code check is respectively 3/5,1/3,1/6 or 1/12 accordingly.
7. the method as described in claim 1,2 or 3, is characterized in that, the length of described cyclic redundancy check (CRC) code is 16,18,20 or 24 bits, wherein:
While being 16 bit, described cyclic redundancy check (CRC) code generator polynomial is G(D)=[D16+D12+D5+1];
While being 18 bit, described cyclic redundancy check (CRC) code generator polynomial is G(D)=[D18+D17+D15+D9+D7+D6+D5+D4+D3+1];
While being 20 bit, described cyclic redundancy check (CRC) code generator polynomial is G(D)=[D20+D18+D17+D14+D12+D10+D8+D7+D2+1];
While being 24 bit, described cyclic redundancy check (CRC) code generator polynomial is G(D)=[D
24+ D
23+ D
6+ D
5+ D+1].
8. the method as described in claim 1,2 or 3, is characterized in that:
To the cyclic redundancy check (CRC) code after described proprietary Downlink Control Information and the operation of described mask, sting tail convolutional encoding, the control channel unit polymerization rank of the Physical Downlink Control Channel of described subscriber equipment is 1,2,4 or 8 o'clock, and the code length of proprietary Downlink Control Information and cyclic redundancy check (CRC) code coding is that the bit length of the Physical Downlink Control Channel that can carry in corresponding control channel unit polymerization rank deducts the code length after the proprietary Downlink Control Information indication information of described control channel unit polymerization rank is encoded.
9. method as claimed in claim 8, is characterized in that:
The code length of proprietary Downlink Control Information and cyclic redundancy check (CRC) code coding is 68,136,272 or 552 accordingly.
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|---|---|---|---|
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| CN200910147397.6A CN101594205B (en) | 2009-06-22 | 2009-06-22 | Method for transmitting downlink control signaling of LTE-Advanced system |
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