CN101388743A - 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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- CN101388743A CN101388743A CNA2007101538789A CN200710153878A CN101388743A CN 101388743 A CN101388743 A CN 101388743A CN A2007101538789 A CNA2007101538789 A CN A2007101538789A CN 200710153878 A CN200710153878 A CN 200710153878A CN 101388743 A CN101388743 A CN 101388743A
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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, by 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, is widely adopted the chnnel coding solution as data traffic transmission in many standard agreements, 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, relatively Chang Yong encryption algorithm also has low-density checksum (Low DensityParity Check is called for short LDPC) sign indicating number.
The rate-matched processing is a very crucial technology after the chnnel coding, 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: 3GPPR6 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 successfully decoded probability by 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, promptly, 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.Be defined as follows about CQI among the 3GPP: 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 every several RB, need report a CQI value on frequency domain, 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 schematic diagram in the LTE system in the prior art.As shown in Figure 3, in ofdm system, message transmission is normally with a transmission block (Transfer Block, TB) be unit, usually comprise one or more code blocks among the TB, 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, all symbols streams of a TB correspondence are shone upon in proper order in above-mentioned RB set in regular turn.
Among Fig. 3, a symbols streams is divided into a plurality of RB transmission units with Resource Block transmission length, as 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..., among the RBm; Symbols streams J
2Each RB transmission unit from RB
M+1Beginning is shone 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 symbols streams is carried out importance difference in the Turbo code decode procedure in terminal, the data of position forward more (promptly the closer to the symbols streams original position) are big more to the contribution of correct decoding, important more in the symbols streams; 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 symbols streams 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, also needs the data that the position is forward to put into the higher RB of CQI when decoding.
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 invention provides a kind of physical channel mapping method of ofdm system, the code block in the transmission block is handled each symbols streams that the back generates, carry out following steps:
(a) described symbols streams is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
(b) determine mapping area and each Resource Block corresponding channel quality indicated value wherein of the Resource Block set of described symbols streams correspondence;
(c) unmapped position is the most forward Resource Block transmission unit is mapped in the Resource Block of unmapped channel quality indicated value maximum.
In addition, code block in the transmission block is carried out following processing generate described symbols streams: 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 number word of Bit Interleave baseband modulation.
In addition, step (b) is determined each Resource Block corresponding channel quality indicated value in the described mapping area according to the following steps:
A: determine the channel quality indicated value sequence in the Resource Block set mapping area of symbols streams: CQI
1, CQI
2..., CQI
k, wherein, CQI
1CQI
2... CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area;
B: the CQI-RB group of determining each channel quality indicated value correspondence 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 described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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, described step (b) is determined each Resource Block corresponding channel quality indicated value in the described mapping area according to the following steps:
The channel quality index strip of the Resource Block of described 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 described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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 Resource Block set of definite described symbols streams correspondence;
Each Resource Block corresponding channel quality indicated value of the mapping area that the Resource Block that channel quality indicates statistical module to be used for definite described symbols streams correspondence is gathered;
The resource block mapping module is used for the Resource Block that the Resource Block transmission unit that unmapped position is the most forward is mapped to unmapped channel quality indicated value maximum.
In addition, described channel quality indication statistical module is determined each Resource Block corresponding channel quality indicated value in the described mapping area in the following way: the channel quality indicated value sequence in the Resource Block set mapping area of at first definite symbols streams: CQI
1, CQI
2..., CQI
k, wherein, CQI
1CQI
2... CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area; Determine the CQI-RB group of each channel quality indicated value correspondence 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 described resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of described mapping area in the following manner:
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, described channel quality indication statistical module is determined each Resource Block corresponding channel quality indicated value in the described mapping area in the following way: the channel quality index strip of the Resource Block of described 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 described resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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 carries out the described symbols streams that following processing generates: 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 number word of Bit Interleave baseband modulation.
The present invention is mapped among the higher RB of CQI value by the RB transmission unit that position in the symbols streams is forward to be transmitted, and has improved the decoding accuracy rate of 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 schematic diagram in the ofdm system;
Fig. 3 is the physical channel mapping method schematic diagram 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 schematic diagram of Fig. 5 is-symbol stream in the RB set;
Fig. 6 is a method flow diagram of determining the mapping area of symbols streams;
Fig. 7 is a kind of CQI mapping criterion schematic diagram of the present invention;
Fig. 8 is an another kind of CQI mapping criterion schematic diagram of the present invention;
Fig. 9 is the physical channel mapping device schematic diagram of embodiment of the invention ofdm system.
Embodiment
As from the foregoing, in ofdm system, message transmission normally is that unit carries out with TB, and is that each TB distributes a RB set, and this RB set is in time domain alignment, all comprises the running time-frequency resource set of a plurality of RB at time domain and frequency domain.If a RB is integrated into frequency domain and comprises F RB, and a CQI band comprises P RB at frequency domain, and then a RB set just includes
Individual CQI value promptly comprises n CQI band,
Expression rounds up to F/P.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 one RB:RB[t in the RB set, f], 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.
Describe the present invention below in conjunction with drawings and Examples.
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 number word of Bit Interleave baseband modulation, 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: determine 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, above-mentioned RB[t, f] follow-up first RB be RB[t, f+1]; When f=F, above-mentioned RB[t, f] follow-up first RB be RB[t+1,1].F is that RB is integrated into the number that frequency domain comprises RB.
The mapping area schematic diagram 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 ....
As shown in Figure 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, just determine the method for the position (time slot index value and sub-channel index value) of each RB of comprising in the mapping area.Wherein, RB[t0, f0] be 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 carry 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: determine symbols streams J
iRB set mapping area in the CQI value sequence: CQI
1, CQI
2..., CQI
k, wherein, CQI
1CQI
2... CQI
kK is the number of different CQI values
106b: determine 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 schematic diagram 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
1CQI
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 schematic diagram 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
1CQI
2CQI
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.
Be described in detail below in conjunction with the physical channel mapping device of drawings and Examples embodiment of the invention ofdm system.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 Resource Block set of definite described symbols streams correspondence;
Each Resource Block corresponding channel quality indicated value of the mapping area that the Resource Block that channel quality indicates statistical module to be used for definite described symbols streams correspondence is gathered;
The resource block mapping module is used for the Resource Block that the Resource Block transmission unit that unmapped position is the most forward is mapped to unmapped channel quality indicated value maximum.
Specifically, in the first embodiment of the present invention:
Channel quality indication statistical module is determined each Resource Block corresponding channel quality indicated value in the described mapping area in the following way: the channel quality indicated value sequence in the Resource Block set mapping area of at first definite symbols streams: CQI
1, CQI
2..., CQI
k, wherein, CQI
1CQI
2... CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area; Determine the CQI-RB group of each channel quality indicated value correspondence 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 described mapping area in the following manner:
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 is determined each Resource Block corresponding channel quality indicated value in the described mapping area in the following way: the channel quality index strip of the Resource Block of described 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 described mapping area in the following manner:
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 determined the mapping area that the Resource Block of described symbols streams correspondence is gathered and obtained the wherein CQI value of Resource Block correspondence 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, a kind of physical channel mapping method of ofdm system is handled each symbols streams that the back generates to the code block in the transmission block, carries out following steps:
(a) described symbols streams is divided into a plurality of Resource Block transmission units in regular turn with Resource Block transmission length;
(b) determine mapping area and each Resource Block corresponding channel quality indicated value wherein of the Resource Block set of described symbols streams correspondence;
(c) unmapped position is the most forward Resource Block transmission unit is mapped in the Resource Block of unmapped channel quality indicated value maximum.
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 carried out following processing generate described symbols streams: 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 number word of Bit Interleave baseband modulation.
3, the physical channel mapping method of ofdm system as claimed in claim 1 is characterized in that: step (b) is determined each Resource Block corresponding channel quality indicated value in the described mapping area according to the following steps:
A: determine the channel quality indicated value sequence in the Resource Block set mapping area of symbols streams: CQI
1, CQI
2..., CQI
k, wherein, CQI
1CQI
2... CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area;
B: the CQI-RB group of determining each channel quality indicated value correspondence 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 described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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, described step (b) is determined each Resource Block corresponding channel quality indicated value in the described mapping area according to the following steps:
The channel quality index strip of the Resource Block of described 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 described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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, a kind of physical channel mapping device of 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 Resource Block set of definite described symbols streams correspondence;
Each Resource Block corresponding channel quality indicated value of the mapping area that the Resource Block that channel quality indicates statistical module to be used for definite described symbols streams correspondence is gathered;
The resource block mapping module is used for the Resource Block that the Resource Block transmission unit that unmapped position is the most forward is mapped to unmapped channel quality indicated value maximum.
8, the physical channel mapping device of ofdm system as claimed in claim 7 is characterized in that,
Described channel quality indication statistical module is determined each Resource Block corresponding channel quality indicated value in the described mapping area in the following way: the channel quality indicated value sequence in the Resource Block set mapping area of at first definite symbols streams: CQI
1, CQI
2..., CQI
k, wherein, CQI
1CQI
2... CQI
kK is the number that Resource Block is gathered channel quality indicated values different in the mapping area; Determine the CQI-RB group of each channel quality indicated value correspondence 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 described resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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,
Described channel quality indication statistical module is determined each Resource Block corresponding channel quality indicated value in the described mapping area in the following way: the channel quality index strip of the Resource Block of described 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 described resource block mapping module is the most forward to unmapped position is mapped to it in Resource Block of described mapping area in the following manner:
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 described 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, each element RB[t among the R, f] be 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 carries out the described symbols streams that following processing generates: 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 number word of Bit Interleave baseband modulation.
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