CN101388743B - Physical channel mapping device and mapping method for OFDM system - Google Patents
Physical channel mapping device and mapping method for OFDM system Download PDFInfo
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- CN101388743B CN101388743B CN2007101538789A CN200710153878A CN101388743B CN 101388743 B CN101388743 B CN 101388743B CN 2007101538789 A CN2007101538789 A CN 2007101538789A CN 200710153878 A CN200710153878 A CN 200710153878A CN 101388743 B CN101388743 B CN 101388743B
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Abstract
The invention relates to a mapping device of a physical communication channel in an orthogonal frequency-division multiplexing system and a mapping method thereof, wherein the method implements the following steps to each flow of symbols which is generated after a code clock in a transmission block is processed, firstly orderly dividing the flow of symbols into a plurality of resource block transmission units with the resource block transmission length, secondly, determining the mapping area which integrates the resource blocks which are corresponding to the flows of symbols and the quality indicated value of the communication channels which are respectively corresponding to the resource blocks in the area, thirdly, mapping the resource transmission block unit which is near to the front most position of the unmapped position into the resource block whose indicated value of the unmapped communication channel quality is the biggest. The method improves the decrypting accuracy of a terminal and reduces the retransmitting frequency through mapping the RB transmission unit whose position is near to the front position in the flow of signals into the RB with higher CQI value.
Description
Technical field
The present invention relates to communication field, relate in particular to the physical channel mapping device and the mapping method thereof of a kind of OFDM of being applicable to (OrthogonalFrequency Division Multiplexing, OFDM) system.
Background technology
Digital communication system as shown in Figure 1 is made up of transmitting terminal, channel and receiving terminal.Wherein, transmitting terminal generally includes parts such as information source, source encoder, channel encoder and modulator; Receiving terminal generally includes demodulator, channel decoder, source decoder and the stay of two nights.
All digital communication systems all need chnnel coding; Chnnel coding is in order to resist various noises and interference in the transmission course; Through increasing redundant information artificially, the system that makes has the ability of automatic correction mistake, thereby guarantees the reliability of Digital Transmission.Turbo code is one of forward error correction coding of present optimum of generally acknowledging, in many standard agreements, extensively adopted the chnnel coding solution as data traffic transmission, and along with the increase of deciphering iterations, the decoding error-correcting performance is more excellent.At up-to-date 3GPP LTE (3rd Generation Partnership Project Long Term Evolution; Third generation partner program Long Term Evolution) adopted in the standard agreement that (QuadraticPolynomial Permutation, the Turbo code that QPP) interweaves is as the channel coding schemes of data service based on quadratic polynomial displacement.
Except that Turbo code, encryption algorithm relatively more commonly used also has low-density checksum (Low DensityParity Check is called for short LDPC) sign indicating number.
It is a very crucial technology after the chnnel coding that rate-matched is handled; Its objective is the code word bits after the chnnel coding is carried out repetition or punching by algorithm controls, be complementary with the physical channel resources of being distributed to guarantee the data bit length after the rate-matched.At present, speed matching algorithm mainly contains two kinds: 3GPP R6 speed matching algorithm and circulating buffer memory rate coupling (Circular Buffer Rate Matching, CBRM) algorithm.Wherein, The circulating buffer memory rate matching algorithm can generate has the outstanding simple algorithm of deleting surplus pattern performance; In series standard, IEEE (Institute of Electrical andElectronics Engineers, Institute of Electrical and Electric Engineers) 802.16e standard and the 3GPP LTE standard of 3GPP2, all adopt this speed matching algorithm.
Mixing automatic request retransmission (HARQ) is extremely important link adaptation techniques in a kind of digital communication system.Receiving terminal is deciphered the HARQ packet of its reception, if decoding correctly then the feeding back ACK signal give transmitting terminal, notify it to send new HARQ packet; Give transmitting terminal if decoding failure then feeds back the NACK signal, the request transmitting terminal resends the HARQ packet.Receiving terminal can improve its decoding probability of success through the packet that repeatedly retransmits is merged decoding, realizes the high reliability request of link transmission.
In order to obtain the higher availability of frequency spectrum, in numerous communication standard protocols, more and more tend to adopt high-order modulating to improve system spectrum utilance and hardware circuit solution performance.
System based on OFDM comprises OFDMA (Orthogonal Frequency Division MultipleAccess, OFDM) system, SC-FDMA (single-carrier frequency division multiple access) system etc.
As shown in Figure 2, in ofdm system, a Resource Block (Resource Block; RB) be a time-frequency two-dimensional unit that constitutes by continuous a plurality of subcarriers on continuous in time a plurality of OFDM mark spaces and the frequency; That is, the time span of a RB is a time slot, comprises a plurality of subcarriers.
Channel quality indication (CQI) is meant from user terminal (UE) feedback, parameter that can indicating downlink link channel quality.Definition about CQI among the 3GPP is following: UE is according in specific reference time slots interval, and to the monitoring result of current wireless environment, the CQI of feedback need guarantee that the transmission block error probability is less than 10%.Simultaneously, UE should report the highest CQI value of can satisfy condition (transmission block size, Physical Resource Block number and modulation system).UE is every on frequency domain need to report a CQI value at a distance from several RB, and promptly several continuous RB constitute the CQI band on the frequency domain.Can use the CQI value to weigh the channel quality of each RB in CQI band and the CQI band, the CQI value is high more, and channel quality is high more.
Fig. 3 is the physical channel mapping method sketch map in the LTE system in the prior art.As shown in Figure 3; In ofdm system; Normally (Transfer Block TB) is unit to message transmission, comprises one or more code blocks usually among the TB with a transmission block; Generate a HARQ packet after each code block process coding and the rate-matched, each HARQ packet generates a symbols streams after ovennodulation; Promptly a transmission block can corresponding a plurality of symbols streams: J
1, J
2..., J
n
In the LTE system, a TB is mapped in the RB set of allocating in advance, and this RB is integrated into time domain and comprises even number time slot (Slot), comprises the bandwidth of a plurality of RB at frequency domain; A RB comprises a plurality of subcarriers (among the LTE being 12) at frequency domain, comprises a plurality of symbols (for example, in fdd mode, a time slot comprises 7 OFDM symbols in time domain) in time domain; Above-mentioned symbols streams is mapped to the principle that physical channel adopts the time (time domain behind the first frequency domain) after the first frequency, and all symbols streams that a TB is corresponding are shone upon in above-mentioned RB set in regular turn in proper order.
Among Fig. 3, a symbols streams is divided into a plurality of RB transmission units with Resource Block transmission length, like J
1Be split into: J
1[1], J
1[2] ..., J
1[m], Resource Block transmission length is data total length that subcarrier transmitted that RB comprises in the time slot; In the symbols streams each RB transmission unit according to first frequency after the principle of time be dispensed in regular turn among each RB in the RB set.For example, J
1[1], J
1[2] ..., J
1[m] is dispensed on RB respectively
1, RB
2..., RB
mIn; Symbols streams J
2Each RB transmission unit from RB
M+1Begin to shine upon according to same principle.
There are the following problems to adopt above-mentioned resource block mapping method (being the physical channel mapping method): because through the HARQ of ovennodulation packet; The different piece that is symbol stream is carried out the importance difference in the Turbo code decode procedure at the terminal; The contribution of the data correct decoding of position forward more (promptly the closer to symbol stream original position) is big more, important more in the symbol stream; And the above-mentioned resource block mapping method that adopts prior art is easy to occur the situation of transmission in the CQI band that forward data in position in the symbol stream are dispensed on low CQI value, has reduced the decoding accuracy, has improved the probability of re-transmission.
In addition, except that the Turbo coding, code-aiming block is encoded if transmit leg adopts the LDPC encryption algorithm, when decoding, also need the data that the position is forward put into the higher RB of CQI.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiency of the physical channel mapping method of ofdm system in the prior art, proposes a kind of terminal decoding accuracy that improves, and reduces the physical channel mapping method that retransmits probability.
In order to address the above problem, the present invention provides a kind of physical channel mapping method of ofdm system, and the code block in the transmission block is handled each symbols streams that the back generates, and carries out following steps:
(a) said symbols streams is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
(b) confirm that the mapping area that the corresponding Resource Block of said symbols streams is gathered reaches wherein each Resource Block corresponding channel quality indicated value;
(c) unmapped position is the most forward Resource Block transmission unit is mapped in the maximum Resource Block of unmapped channel quality indicated value.
In addition; Code block in the transmission block is handled the said symbols streams of generation as follows: use Turbo or low-density checksum algorithm to encode; And to the coding after code word bits carry out rate-matched based on circular buffer; Output mixes automatic request retransmission packet, and should mix automatic request retransmission packet through the laggard line of numbers baseband modulation of Bit Interleave.
In addition, step (b) is confirmed each Resource Block corresponding channel quality indicated value in the said mapping area according to the following steps:
A: the Resource Block of confirming symbols streams is gathered the channel quality indicated value sequence in the mapping area: CQI
1, CQI
2..., CQI
k, wherein, CQI
1＞CQI
2＞...＞CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area;
B: confirm the CQI-RB group that each channel quality indicated value is corresponding in the channel quality indicated value sequence: CQI-RB
1, CQI-RB
1..., CQI-RB
kThe Resource Block that comprises in each CQI-RB group has identical channel quality indicated value.
In addition, the Resource Block transmission unit the most forward to unmapped position in the step (c) is mapped to it in Resource Block of said mapping area by following mode:
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same CQI-RB group; Perhaps
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same CQI-RB group sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
In addition, said step (b) is confirmed each Resource Block corresponding channel quality indicated value in the said mapping area according to the following steps:
The channel quality index strip of the Resource Block of said symbols streams being gathered mapping area according to the descending order of corresponding channel quality indicated value sorts: CQI-BAND
1, CQI-BAND
2..., CQI-BAND
l, l is the number of channel quality index strip in the Resource Block set.
In addition, the Resource Block transmission unit the most forward to unmapped position in the step (c) is mapped to it in Resource Block of said mapping area by following mode:
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same channel quality index strip; Or
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same channel quality index strip sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
The present invention also provides a kind of physical channel mapping device of ofdm system, it is characterized in that, this device comprises: symbols streams is cut apart module, the mapping area distribution module of Resource Block set, channel quality indication statistical module, resource block mapping module; Wherein:
Symbols streams is cut apart module and is used for each symbols streams of generation after the code block processing of transmission block is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
The mapping area distribution module of Resource Block set is used for the mapping area of the corresponding Resource Block set of definite said symbols streams;
Channel quality indication statistical module is used for each Resource Block corresponding channel quality indicated value of the mapping area of the corresponding Resource Block set of definite said symbols streams;
The resource block mapping module is used for the Resource Block transmission unit that unmapped position is the most forward and is mapped to the maximum Resource Block of unmapped channel quality indicated value.
In addition, said channel quality indication statistical module adopts following mode to confirm each Resource Block corresponding channel quality indicated value in the said mapping area: the Resource Block of at first confirming symbols streams is gathered the channel quality indicated value sequence in the mapping area: CQI
1, CQI
2..., CQI
k, wherein, CQI
1＞CQI
2＞...＞CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area; Confirm the CQI-RB group that each channel quality indicated value is corresponding in the channel quality indicated value sequence: CQI-RB then
1, CQI-RB
1..., CQI-RB
kThe Resource Block that comprises in each CQI-RB group has identical channel quality indicated value;
The Resource Block transmission unit that said resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of said mapping area by following mode:
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same CQI-RB group; Perhaps
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same CQI-RB group sub-channels index value;
In addition, said channel quality indication statistical module adopts following mode to confirm each Resource Block corresponding channel quality indicated value in the said mapping area: the channel quality index strip of the Resource Block of said symbols streams being gathered mapping area according to the descending order of corresponding channel quality indicated value sorts: CQI-BAND
1, CQI-BAND
2..., CQI-BAND
l, l is the number of channel quality index strip in the Resource Block set;
The Resource Block transmission unit that said resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of said mapping area by following mode:
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same channel quality index strip; Or
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same channel quality index strip sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
In addition; Code block in the transmission block is handled the said symbols streams of generation as follows: use Turbo or low-density checksum algorithm to encode; And to the coding after code word bits carry out rate-matched based on circular buffer; Output mixes automatic request retransmission packet, and should mix automatic request retransmission packet through the laggard line of numbers baseband modulation of Bit Interleave.
The present invention is mapped among the higher RB of CQI value through the RB transmission unit that position in the symbols streams is forward to be transmitted, and has improved the decoding accuracy rate at terminal, has reduced the number of times that retransmits.
Description of drawings
Fig. 1 is the digital communication system structural representation;
Fig. 2 is the Resource Block sketch map in the ofdm system;
Fig. 3 is the physical channel mapping method sketch map in the LTE system in the prior art;
Fig. 4 is the physical channel mapping method flow chart of embodiment of the invention ofdm system;
The mapping area sketch map of Fig. 5 is-symbol stream in the RB set;
Fig. 6 is a method flow diagram of confirming the mapping area of symbols streams;
Fig. 7 is a kind of CQI mapping criterion sketch map of the present invention;
Fig. 8 is an another kind of CQI mapping criterion sketch map of the present invention;
Fig. 9 is the physical channel mapping device sketch map of embodiment of the invention ofdm system.
Embodiment
By on can know that in ofdm system, message transmission normally is that unit carries out with TB, and be that each TB distributes a RB set, this RB set is in time domain alignment, the running time-frequency resource that all comprises a plurality of RB at time domain and frequency domain is gathered.If a RB is integrated into frequency domain and comprises F RB, and a CQI band comprises P RB at frequency domain, then RB set just include n=" F/P] individual CQI value, promptly comprise n CQI and be with, " F/P] represent F/P is rounded up.Basic ideas of the present invention are that the RB transmission unit that position in the symbols streams is forward is mapped among the higher RB of CQI value and transmits.
For the ease of present invention is described, below adopt the mode of two-dimensional array (RB matrix) that each RB is quoted explanation: for any RB:RB [t, f] in the RB set; F is the sub-channel index of this RB on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that RB is integrated into the number that frequency domain comprises RB, and T is that RB is integrated into the number that time domain comprises time slot.
To combine accompanying drawing and embodiment to describe the present invention below.
Fig. 4 is the physical channel mapping method flow chart of embodiment of the invention ofdm system; As shown in Figure 4, physical channel mapping method of the present invention comprises following steps:
101: TB is divided into the identical a plurality of code blocks of length: T
1, T
2..., T
n, n is the number of the code block that comprises among the TB; Order: i=1;
102: i code block among the TB carried out the Turbo coding, and the code word bits behind the Turbo coding is carried out rate-matched based on circular buffer, output mixes automatic request retransmission HARQ packet;
103: above-mentioned HARQ packet through the laggard line of numbers baseband modulation of Bit Interleave, is generated symbols streams J
i
104: with symbols streams J
iIn the data bit that comprises be divided into a plurality of RB transmission units: J in regular turn with Resource Block transmission length
i[1], J
i[2] ..., J
i[m], m are the number of the RB transmission unit that comprises in the symbols streams;
105: confirm symbols streams J
iMapping area in the RB of correspondence set;
Above-mentioned mapping area is the order according to the time after the first frequency, promptly changes earlier the sub-channel index of RB, the time slot index that the back changes RB, the position of continuous m the RB that begins from the initial RB of this symbols streams.For first symbols streams among the TB, above-mentioned initial RB is first RB in the RB set, i.e. RB [1,1]; For the successive character among TB stream, above-mentioned initial RB is shared last of a last symbols streams, i.e. follow-up first RB of the RB of time slot index and sub-channel index value maximum.
When f＜F, follow-up first RB of above-mentioned RB [t, f] is RB [t, f+1]; When f=F, follow-up first RB of above-mentioned RB [t, f] is RB [t+1,1].F is that RB is integrated into the number that frequency domain comprises RB.
The mapping area sketch map of Fig. 5 is-symbol stream in the RB set.A symbols streams comprises 12 RB transmission units among Fig. 5, and RB is integrated into frequency domain and comprises 10 RB; Underlined J
1The zone that in RB set, occupies of RB be symbols streams J
1Mapping area; Underlined J
2The zone that in RB set, occupies of RB be symbols streams J
2Mapping area ....
Can know by Fig. 5, the mapping area of symbols streams in RB set in fact be exactly according to the first frequency of LTE after the position of the criterion of time each RB that this symbols streams takies in the RB set when carrying out the physical channel mapping.
The flow chart description of Fig. 6 definite symbols streams J
iA kind of concrete grammar of mapping area, the method for the position (time slot index value and sub-channel index value) of each RB that just confirms to comprise in the mapping area.Wherein, RB [t0, f0] is symbols streams J
iThe initial RB of the mapping area in the RB set, m is symbols streams J
iIn the number of RB transmission unit, F is that RB is integrated into the number that frequency domain comprises RB; This method comprises following steps:
105A: order: k=1, t=t0, f=f0;
105B: with RB [t, f] as the RB in the mapping area;
105C: make k=k+1;
105D: if k＞m, then this flow process finishes; Otherwise carry out next step;
105E: make f=f+1;
105F: if f＞F then carries out next step; Otherwise jump to step 105B;
105G: order: f=1, t=t+1; Jump to step 105B.
106: at symbols streams J
iRB set mapping area in, according to CQI mapping criterion this symbols streams is carried out the physical channel mapping, that is:
The most forward RB transmission unit in unmapped position in this symbols streams is mapped among the RB of the CQI value maximum of shining upon as yet.
Above-mentioned CQI mapping criterion comprises following two kinds of embodiments:
Execution mode one:
106a: confirm symbols streams J
iRB set mapping area in the CQI value sequence: CQI
1, CQI
2..., CQI
k, wherein, CQI
1＞CQI
2＞...＞CQI
kK is the number of different CQI values
106b: confirm the corresponding CQI-RB group of each CQI value: CQI-RB in the CQI value sequence
1, CQI-RB
1..., CQI-RB
kThe RB that comprises in each CQI-RB group has identical CQI value;
106c: at symbols streams J
iRB set mapping area in, according to CQI mapping criterion, in regular turn with symbols streams J
iEach RB transmission unit be mapped among each RB;
Above-mentioned CQI mapping criterion is meant: the preferential CQI-RB group with higher CQI value of using; And the preferential little RB of time slot index value that uses in same CQI-RB group; And, preferentially use the little RB of sub-channel index value for the identical RB of time slot index value in the same CQI-RB group.
Fig. 7 is the sketch map of the CQI mapping criterion of execution mode one.Symbols streams J among Fig. 7
i Comprise 12 RB transmission units, the RB set comprises 3 CQI band: CQI-BAND
1, CQI-BAND
2, CQI-BAND
3, wherein, CQI-BAND
1, CQI-BAND
3Has identical CQI value: CQI
1, CQI-BAND
2The CQI value be CQI
2, CQI
1＞CQI
2
Execution mode two:
106a ': according to the descending order of the CQI value of correspondence to symbols streams J
iRB set mapping area in CQI bring line ordering into: CQI-BAND
1, CQI-BAND
2..., CQI-BAND
l, l is the number of CQI band in the RB set, comprises one or more RB in each CQI band;
106b ': at symbols streams J
iRB set mapping area in, according to CQI mapping criterion, in regular turn with symbols streams J
iEach RB transmission unit be mapped among each RB;
Above-mentioned CQI mapping criterion is meant: the preferential CQI band with higher CQI value that uses; And the preferential little RB of time slot index value that uses in same CQI band; And, preferentially use the little RB of sub-channel index value for the identical RB of time slot index value in the same CQI band.
Fig. 8 is the sketch map of the CQI mapping criterion of execution mode two.Symbols streams J among Fig. 8
i Comprise 12 RB transmission units, the RB set comprises 3 CQI band: CQI-BAND
1, CQI-BAND
2, CQI-BAND
3, have different CQI values: CQI respectively
1, CQI
2, CQI
3, wherein, CQI
1＞CQI
2＞CQI
3
107:, then carry out next step if remain code block in addition in the transmission block; Otherwise this method finishes.
108: make i=i+1, jump to step 102.
Based on principle of the present invention, the foregoing description can also have multiple variation pattern, for example:
For the CQI mapping criterion of the foregoing description one, in same CQI-RB group, also can preferentially use the little RB of sub-channel index value; And, preferentially use the little RB of time slot index value for the identical RB of same CQI-RB group sub-channels index value.
CQI mapping criterion for the foregoing description two also can be carried out similar conversion.
To combine accompanying drawing and embodiment that the physical channel mapping device of embodiment of the invention ofdm system is described in detail below.As shown in Figure 9, this physical channel mapping device comprises: symbols streams is cut apart module, the mapping area distribution module of Resource Block set, channel quality indication statistical module, resource block mapping module; Wherein:
Symbols streams is cut apart module and is used for each symbols streams of generation after the code block processing of transmission block is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
The mapping area distribution module of Resource Block set is used for the mapping area of the corresponding Resource Block set of definite said symbols streams;
Channel quality indication statistical module is used for each Resource Block corresponding channel quality indicated value of the mapping area of the corresponding Resource Block set of definite said symbols streams;
The resource block mapping module is used for the Resource Block transmission unit that unmapped position is the most forward and is mapped to the maximum Resource Block of unmapped channel quality indicated value.
Specifically, in the first embodiment of the present invention:
Channel quality indication statistical module adopts following mode to confirm each Resource Block corresponding channel quality indicated value in the said mapping area: the Resource Block of at first confirming symbols streams is gathered the channel quality indicated value sequence in the mapping area: CQI
1, CQI
2..., CQI
k, wherein, CQI
1＞CQI
2＞...＞CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area; Confirm the CQI-RB group that each channel quality indicated value is corresponding in the channel quality indicated value sequence: CQI-RB then
1, CQI-RB
1..., CQI-RB
kThe Resource Block that comprises in each CQI-RB group has identical channel quality indicated value;
Simultaneously, the Resource Block transmission unit that the resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of said mapping area by following mode:
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same CQI-RB group; Perhaps
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same CQI-RB group sub-channels index value.
In the second embodiment of the present invention:
Channel quality indication statistical module adopts following mode to confirm each Resource Block corresponding channel quality indicated value in the said mapping area: the channel quality index strip of the Resource Block of said symbols streams being gathered mapping area according to the descending order of corresponding channel quality indicated value sorts: CQI-BAND
1, CQI-BAND
2..., CQI-BAND
l, l is the number of channel quality index strip in the Resource Block set;
Simultaneously, the Resource Block transmission unit that the resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of said mapping area by following mode:
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same channel quality index strip; Or
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same channel quality index strip sub-channels index value.
Though more than be to be example with the LTE system; But the present invention also goes for other ofdm system; As long as confirmed the mapping area of the Resource Block set that said symbols streams is corresponding and obtained the wherein corresponding CQI value of Resource Block by the mode of this system's regulation; The Resource Block transmission unit that unmapped position is the most forward is mapped in the maximum Resource Block of unmapped CQI value, just can reach identical technique effect.
Claims (10)
1. the physical channel mapping method of an ofdm system is handled each symbols streams that the back generates to the code block in the transmission block, carries out following steps:
(a) said symbols streams is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
(b) confirm that the mapping area that the corresponding Resource Block of said symbols streams is gathered reaches wherein each Resource Block corresponding channel quality indicated value;
(c) unmapped position is the most forward Resource Block transmission unit is mapped in the maximum Resource Block of unmapped channel quality indicated value.
2. the physical channel mapping method of ofdm system as claimed in claim 1; It is characterized in that; Code block in the transmission block is handled the said symbols streams of generation as follows: use Turbo or low-density checksum algorithm to encode; And the code word bits behind the coding carried out rate-matched based on circular buffer, output mixes automatic request retransmission packet, and should mix automatic request retransmission packet and pass through the laggard line of numbers baseband modulation of Bit Interleave.
3. the physical channel mapping method of ofdm system as claimed in claim 1 is characterized in that: step (b) is confirmed each Resource Block corresponding channel quality indicated value in the said mapping area according to the following steps:
A: the Resource Block of confirming symbols streams is gathered the channel quality indicated value sequence in the mapping area: CQI
1, CQI
2..., CQI
k, wherein, CQI
1＞CQI
2＞...＞CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area;
B: confirm the CQI-RB group that each channel quality indicated value is corresponding in the channel quality indicated value sequence: CQI-RB
1, CQI-RB
1..., CQI-RB
kThe Resource Block that comprises in each CQI-RB group has identical channel quality indicated value.
4. the physical channel mapping method of ofdm system as claimed in claim 3 is characterized in that: the Resource Block transmission unit the most forward to unmapped position in the step (c) is mapped to it in Resource Block of said mapping area by following mode:
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same CQI-RB group; Perhaps
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same CQI-RB group sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
5. the physical channel mapping method of ofdm system as claimed in claim 1 is characterized in that, said step (b) is confirmed each Resource Block corresponding channel quality indicated value in the said mapping area according to the following steps:
The channel quality index strip of the Resource Block of said symbols streams being gathered mapping area according to the descending order of corresponding channel quality indicated value sorts: CQI-BAND
1, CQI-BAND
2..., CQI-BAND
l, l is the number of channel quality index strip in the Resource Block set.
6. the physical channel mapping method of ofdm system as claimed in claim 5 is characterized in that, the Resource Block transmission unit the most forward to unmapped position in the step (c) is mapped to it in Resource Block of said mapping area by following mode:
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same channel quality index strip; Or
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same channel quality index strip sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
7. the physical channel mapping device of an ofdm system is characterized in that, this device comprises: symbols streams is cut apart module, the mapping area distribution module of Resource Block set, channel quality indication statistical module, resource block mapping module; Wherein:
Symbols streams is cut apart module and is used for each symbols streams of generation after the code block processing of transmission block is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
The mapping area distribution module of Resource Block set is used for the mapping area of the corresponding Resource Block set of definite said symbols streams;
Channel quality indication statistical module is used for each Resource Block corresponding channel quality indicated value of the mapping area of the corresponding Resource Block set of definite said symbols streams;
The resource block mapping module is used for the Resource Block transmission unit that unmapped position is the most forward and is mapped to the maximum Resource Block of unmapped channel quality indicated value.
8. the physical channel mapping device of ofdm system as claimed in claim 7 is characterized in that,
Said channel quality indication statistical module adopts following mode to confirm each Resource Block corresponding channel quality indicated value in the said mapping area: the Resource Block of at first confirming symbols streams is gathered the channel quality indicated value sequence in the mapping area: CQI
1, CQI
2..., CQI
k, wherein, CQI
1＞CQI
2＞...＞CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area; Confirm the CQI-RB group that each channel quality indicated value is corresponding in the channel quality indicated value sequence: CQI-RB then
1, CQI-RB
1..., CQI-RB
kThe Resource Block that comprises in each CQI-RB group has identical channel quality indicated value;
The Resource Block transmission unit that said resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of said mapping area by following mode:
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same CQI-RB group; Perhaps
The preferential CQI-RB group of using with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same CQI-RB group; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same CQI-RB group sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
9. the physical channel mapping device of ofdm system as claimed in claim 7 is characterized in that,
Said channel quality indication statistical module adopts following mode to confirm each Resource Block corresponding channel quality indicated value in the said mapping area: the channel quality index strip of the Resource Block of said symbols streams being gathered mapping area according to the descending order of corresponding channel quality indicated value sorts: CQI-BAND
1, CQI-BAND
2..., CQI-BAND
l, l is the number of channel quality index strip in the Resource Block set;
The Resource Block transmission unit that said resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of said mapping area by following mode:
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of time slot index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of sub-channel index value for the identical Resource Block of time slot index value in the same channel quality index strip; Or
The preferential channel quality index strip that uses with high channel quality indicated value; And the preferential little Resource Block of sub-channel index value that uses in same channel quality index strip; And, preferentially use the little Resource Block of time slot index value for the identical Resource Block of same channel quality index strip sub-channels index value;
The set of said Resource Block is that ofdm system is the set of carrying out the Resource Block that is expressed as two-dimentional Resource Block matrix R that transport block transmission distributes, and each the element RB [t, f] among the R is a Resource Block; F is the sub-channel index of Resource Block on frequency domain; T is the time slot index on the time domain, 1≤f≤F, 1≤t≤T; F is that Resource Block is integrated into the number that frequency domain comprises Resource Block, and T is that Resource Block is integrated into the number that time domain comprises time slot.
10. the physical channel mapping device of ofdm system as claimed in claim 7; It is characterized in that; Code block in the transmission block is handled the said symbols streams of generation as follows: use Turbo or low-density checksum algorithm to encode; And the code word bits behind the coding carried out rate-matched based on circular buffer, output mixes automatic request retransmission packet, and should mix automatic request retransmission packet and pass through the laggard line of numbers baseband modulation of Bit Interleave.
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| CN106922031B (en) * | 2015-12-24 | 2020-04-10 | 上海朗帛通信技术有限公司 | Scheduling method and device in wireless communication |
| US10164659B2 (en) | 2016-05-12 | 2018-12-25 | Mediatek Inc. | QC-LDPC coding methods and apparatus |
| CN107645370B (en) | 2016-07-20 | 2020-12-08 | 华为技术有限公司 | Resource mapping method and device |
| CN107733557A (en) * | 2016-08-12 | 2018-02-23 | 中兴通讯股份有限公司 | A kind of method and device of data transmission, communication equipment |
| US10581457B2 (en) | 2017-01-09 | 2020-03-03 | Mediatek Inc. | Shift coefficient and lifting factor design for NR LDPC code |
| US10630319B2 (en) | 2017-01-24 | 2020-04-21 | Mediatek Inc. | Structure of interleaver with LDPC code |
| US10432227B2 (en) | 2017-01-24 | 2019-10-01 | Mediatek Inc. | Location of interleaver with LDPC code |
| WO2018141292A1 (en) * | 2017-02-06 | 2018-08-09 | 华为技术有限公司 | Data processing method and device |
| CN108400838B (en) | 2017-02-06 | 2021-05-18 | 华为技术有限公司 | Data processing method and device |
| CN108540262A (en) * | 2017-03-03 | 2018-09-14 | 华为技术有限公司 | The method and apparatus of data processing |
| CN108809601B (en) * | 2017-05-04 | 2023-10-24 | 华为技术有限公司 | Wireless communication method and device |
| CN115277339B (en) * | 2017-05-05 | 2024-10-15 | 中兴通讯股份有限公司 | Information transmission method and device and electronic equipment |
| CN108809499A (en) | 2017-05-05 | 2018-11-13 | 华为技术有限公司 | Communication means and device |
| US10567116B2 (en) | 2017-05-12 | 2020-02-18 | Mediatek Inc. | Wireless communication using codebooks from a QC-LDPC code for shorter processing latency and improved decoder throughput efficiency |
| US10484011B2 (en) | 2017-05-12 | 2019-11-19 | Mediatek Inc. | Shift-coefficient table design of QC-LDPC code for larger code block sizes in mobile communications |
| US10484013B2 (en) | 2017-05-12 | 2019-11-19 | Mediatek Inc. | Shift-coefficient table design of QC-LDPC code for smaller code block sizes in mobile communications |
| CN111050349B (en) | 2018-10-12 | 2021-12-03 | 华为技术有限公司 | Method, device and system for determining channel quality information |
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