CN101425873B - Multimedia broadcast multicast data sending/receiving method, apparatus and system - Google Patents

Multimedia broadcast multicast data sending/receiving method, apparatus and system Download PDF

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Publication number
CN101425873B
CN101425873B CN2007101820898A CN200710182089A CN101425873B CN 101425873 B CN101425873 B CN 101425873B CN 2007101820898 A CN2007101820898 A CN 2007101820898A CN 200710182089 A CN200710182089 A CN 200710182089A CN 101425873 B CN101425873 B CN 101425873B
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information
bit
multimedia broadcast
sparse matrix
coding
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CN101425873A (en
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余荣道
李琦
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2007101820898A priority Critical patent/CN101425873B/en
Priority to PCT/CN2008/072895 priority patent/WO2009059549A1/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/11—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
    • H03M13/1102—Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/63—Joint error correction and other techniques
    • H03M13/6306—Error control coding in combination with Automatic Repeat reQuest [ARQ] and diversity transmission, e.g. coding schemes for the multiple transmission of the same information or the transmission of incremental redundancy
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/63—Joint error correction and other techniques
    • H03M13/635—Error control coding in combination with rate matching
    • H03M13/6362—Error control coding in combination with rate matching by puncturing
    • H03M13/6368—Error control coding in combination with rate matching by puncturing using rate compatible puncturing or complementary puncturing
    • H03M13/6393—Rate compatible low-density parity check [LDPC] codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end

Abstract

The invention discloses a multimedia broadcast/multicast data transmitting/receiving method, a device and a system. The method comprises the following steps: the multimedia broadcast/multicast data are decoded by low-density parity check codes (LDPC); service data after being decoded can be divided into first information and second information, and then the first information and the second information are transmitted; a receiving terminal judges the environmental quality of a signal path where the receiving end is located; when the environmental quality of the signal path is good, only the first information can be received; while the environmental quality of the signal path is poor, both the first information and the second information can be received. According to different signal path environment where the receiving terminal is located, the receiving terminal can achieve the purpose by adopting the invention that the MBMS service data can be received with lower receiving power while ensuring the received service data quality.

Description

A kind of multimedia broadcast multicast data sending send/method of reseptance, device and system
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of multimedia broadcast multicast data sending delivery method, method of reseptance and corresponding device thereof and system.
Background technology
In various mobile Packet Services, comprise that business such as video request program, television broadcasting, video conference, online education, interactive game have a principal character, the a plurality of users that subscribe to this business exactly receive identical data simultaneously, and this class is professional compares with general data, often have that the concurrent user is many, data volume greatly, characteristics such as longer duration, delay sensitive.Obviously, this class business is still continued to use common point-to-point transmission method, efficient is low-down for the mobile communications network of resource scarcity.For this reason, in a lot of communication systems,, introduce multimedia broadcasting and multicast service (Multimedia Broadcast Multicast Service is called for short MBMS) technology at the transmission demand of this class broadcasting and multicast service.In the MBMS technology, a data source can send to a plurality of users simultaneously and a little arrive the multiple spot data, and realizes that effectively Internet resources are shared, comprises that mobile core network and access network resource are shared, and especially air interface resource is shared.Existing MBMS business has following characteristics: the MBMS business is the business of point to multiple spot, and the base station can not be carried out Adaptive Transmission at each user's channel characteristics, does not therefore have the channel-quality feedback link, is a kind of open-loop transmission.Simultaneously owing to there is not link quality feedback, thus the MBMS business do not mix yet automatic repeat requests (Hybrid Automatic Repeat reQuest, HARQ), adaptive coding and modulating (AMC) mechanism.
Because the MBMS business is the transmission of a kind of point to multiple spot, and the user in the sub-district distribution situation relatively at random, can be distributed in each position, sub-district, the user who has is near from the base station, has a user far away from the base station, so each user's receiving signal attenuation degree is had nothing in common with each other.In order to guarantee effective reception of MBMS business, when chnnel coding, code check need be considered the particularly Qos requirement of remote subscriber of the most of users in sub-district.For near-end user,, also can only receive low speed data like this, cause the power consumption of receiver well below its receiving ability even channel condition is fine.
(Low Density Parity Check Codes LDPC), is a kind of linear block codes that was proposed and studied in 1962 by Gallager to low density parity check code.The LDPC sign indicating number has good Hamming distance characteristic, utilizes iterative decoding algorithm, and the LDPC sign indicating number can approach the shannon capacity limit with lower complexity.
The LDPC sign indicating number is a kind of linear block codes, and its name derives from the sparse property of its check matrix, and promptly the number of every row (every row) nonzero element is very rare in the check matrix, and the position is issue at random, and most elements all is " 0 ".For coding back code length is that n bit, information bit number of bits are the LDPC sign indicating number of k, can be by its check matrix H (n-k) * nDescribe, all code words satisfy xH T=0.Each line display of check matrix verification constraint, wherein the code element variable x of all nonzero element correspondences jConstitute a checksum set, represent with a check equations; The verification constraint that a code element variable participates in is shown in each tabulation of check matrix, when column element is non-vanishing, represents that this code element variable has participated in the verification constraint of this row.
The LDPC sign indicating number is divided into canonical LDPC sign indicating number and non-canonical LDPC sign indicating number.Gallager has provided the definition of canonical LDPC sign indicating number the earliest, and specifically, the check matrix H of canonical LDPC sign indicating number satisfies following three conditions:
(1) every row of H has ρ " 1 ";
(2) H's whenever shows λ " 1 ";
(3) compare with the line number of code length and matrix, ρ and λ are very little.
If code block length is n, then canonical LDPC sign indicating number can be with (n, λ ρ) represent.Example 1 has provided the check matrix of one (8,2,4) sign indicating number.
The check matrix H of the canonical LDPC sign indicating number of 1: one (8,2,4) sign indicating number of example is:
H = 1 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 0 1 1 0 0 1
Usually, for the convenience that studies a question, can be expressed as a bigraph (bipartite graph) with the corresponding Tanner graph model of LDPC sign indicating number.For example, the check matrix H in the example 1 can be represented with the bigraph (bipartite graph) of Fig. 1 of equal valuely.The circle point expression variable node of top, following square dot is represented constraint, that is to say that the node of top is corresponding to every row of check matrix, following node is corresponding to every row of check matrix, and the line between last mid-side node and the following mid-side node is represented non-" 0 " element in the check matrix.
When the number of " 1 " in each row (OK) of check matrix H is incomplete when identical, just obtained non-canonical LDPC sign indicating number.
With Turbo code, the LDPC sign indicating number has the following advantages:
(1) decoding complexity of LDPC sign indicating number is low than Turbo code; And, because the computation complexity of an iteration is low more than the computation complexity of an iteration in the Turbo code decoding algorithm in the LDPC sign indicating number decoding algorithm, therefore can be by changing the optimal compromise that maximum iteration time obtains " complexity-performance "; In addition, the decoding of LDPC sign indicating number can be handled by highly-parallel;
(2) 1 probability is linear to be increased the minimum range of binary system LDPC sign indicating number to approach along with code length;
(3) according to code length and encoding rate are easy to the superior LDPC sign indicating number of design performance arbitrarily;
(4) the LDPC sign indicating number does not have " mistake floor " phenomenon, and this is suitable for using the occasion of short frame.
In the prior art, also do not utilize the LDPC sign indicating number to carry out the professional transmission of MBMS, and make the different receiving terminal of channel circumstance realize receiving the MBMS business datum with less received power.
Summary of the invention
The embodiment of the invention provides a kind of MBMS business datum transmission/method of reseptance, device and system, make receiving terminal when guaranteeing the business datum quality of reception, to realize with less received power reception MBMS business datum according to the difference of self channel circumstance of living in.
The MBMS business datum sending method that the embodiment of the invention provides comprises:
Adopt low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data;
Business datum behind the coding is divided into the first information and second information;
Send the described first information and second information.
The embodiment of the invention provides a kind of multimedia broadcast multicast data method of reseptance, comprising:
Receiving terminal is judged self present located channel circumstance quality;
When self current channel quality parameter value when characterizing the good corresponding threshold value of channel quality, receive the first information according to the running time-frequency resource of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
When self current channel quality parameter value when characterizing the good corresponding threshold value of channel quality, receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
The embodiment of the invention also provides a kind of base station, comprising:
Coding unit is used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data;
Processing unit is used for the business datum behind the coding is divided into the first information and second information;
Transmitting element is used to send the described first information and second information.
The embodiment of the invention also provides a kind of portable terminal, comprising:
Judging unit is used to judge self present located channel circumstance quality; When self current channel quality parameter value when characterizing the good corresponding threshold value of channel quality, start first receiving element; When self current channel quality parameter value when characterizing the good corresponding threshold value of channel quality, start second receiving element;
First receiving element is according to the running time-frequency resource reception first information of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
Second receiving element receives the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
The embodiment of the invention also provides a kind of multimedia broadcast-multicast service transmission system, comprise base station and portable terminal, described base station is used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data, and the business datum behind the coding is sent to portable terminal after being divided into the first information and second information;
Described portable terminal is used to judge self present located channel circumstance quality; When self current channel quality parameter value when characterizing the good corresponding threshold value of channel quality, receive the first information according to the running time-frequency resource of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
When self present located channel quality parameter value when characterizing the good corresponding threshold value of channel quality, receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
According to the embodiment of the invention, adopt the LDPC sign indicating number to encode multimedia broadcast multicast data; Business datum behind the coding is sent to receiving terminal after being divided into the first information and second information.The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC; Described second information is for removing all the other outer bits of the described first information in the multimedia broadcast multicast data after encoding.Receiving terminal is judged self present located channel circumstance quality, when self present located channel circumstance good (the channel quality parameter value is more than or equal to characterizing the good corresponding threshold value of channel quality), according to the running time-frequency resource reception first information of first information correspondence; When self present located channel circumstance poor (the channel quality parameter value is less than characterizing the good corresponding threshold value of channel quality), receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence.Like this,,, only need to receive the first information and can finish data demodulates smoothly, do not need to receive again second information, therefore reduced time of reception, reduced the reception energy consumption because higher signal to noise ratio (snr) is arranged for the good receiving terminal of channel circumstance.For the receiving terminal of channel circumstance difference, because SNR is lower, after receiving the first information and second information, carry out combined decoding, obtain the MBMS business datum that transmitting terminal sends, thereby guaranteed the quality of reception of MBMS business.
Description of drawings
Fig. 1 is a Tanner graph model corresponding with the LDPC sign indicating number in the prior art;
The transmitting terminal that Fig. 2 provides for the embodiment of the invention 1 sends MBMS business datum flow chart of steps;
Fig. 3 is one of sparse matrix organigram in the embodiment of the invention 1;
Fig. 4 be in the embodiment of the invention 1 the sparse matrix organigram two;
The transmitting terminal that Fig. 5 provides for the embodiment of the invention 2 sends MBMS business datum flow chart of steps;
The receiving terminal that Fig. 6 provides for the embodiment of the invention 3 receives MBMS business datum flow chart of steps;
A kind of architecture of base station schematic diagram that Fig. 7 provides for the embodiment of the invention;
A kind of mobile terminal structure schematic diagram that Fig. 8 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of multimedia broadcast multicast data sending delivery method, comprising:
Adopt the LDPC sign indicating number to encode multimedia broadcast multicast data; Business datum behind the coding is divided into the first information and second information; Send the described first information and second information to receiving terminal.
Above-mentioned multimedia broadcast multicast data sending delivery method is described in detail with specific embodiment below in conjunction with accompanying drawing.
Embodiment 1:
The basic principle that realizes is: construct one first sparse matrix, be referred to as basic matrix for convenience of description, make and adopt the multimedia broadcast multicast data after basic matrix is encoded to be correctly decoded by the good receiving terminal of channel circumstance; By basic matrix is expanded, generate second sparse matrix, be referred to as to strengthen check matrix for convenience of description, for the receiving terminal of channel circumstance difference, decode behind the full detail after reception is encoded according to the enhancing check matrix, obtain the transmission data of MBMS business.
Concrete steps comprise referring to Fig. 2:
First sparse matrix (basic matrix) of the capable N row of step S101, M of structure makes and adopts the multimedia broadcast multicast data after basic matrix is encoded to be correctly decoded by the good receiving terminal of channel circumstance.
The concrete building method of basic matrix can adopt various building method of the prior art, for example:
At first construct a same code rate but low dimension m b* n bMatrix H b, basic matrix then can pass through matrix H bExpansion forms.The criterion of expansion is a matrix H bIn element " 1 " replace H with certain suitable z * z dimension cyclic permutation matrices bIn element " 0 " then use 0 matrix of z * z to replace, i.e. H bP I, jOr the cyclic permutation matrices of a z * z, or 0 matrix of a z * z.
In this step S101, need to make the basic matrix that constructs to satisfy: adopt the multimedia broadcast multicast data after this basic matrix is encoded to be correctly decoded by the good receiving terminal of channel circumstance, channel circumstance can define more than or equal to characterizing the good corresponding threshold value of channel quality by the channel quality parameter value well.For example: make that (Signal Noise Rate, SNR) receiving terminal more than or equal to setting threshold can be correctly decoded the multimedia broadcast multicast data that adopts after this basic matrix is encoded to signal to noise ratio, perhaps uses other can define the method for channel quality.Concrete setting threshold or threshold value can be consulted by network side and end side, also can according to circumstances set up back notice end side on their own by network side.
For the basic matrix that comes out according to theory building, can adopt the mode of emulation or experiment to verify whether it satisfies condition.Also can adopt the means of emulation or experiment to determine the basic matrix that satisfies condition.
Step S102, basic matrix is expanded, generated second sparse matrix (enhancing check matrix) of (M+J) row (N+J) row.
The concrete mode that basic matrix is expanded, for example:
Increase by 0 matrix of the capable J row of M on the right side of basic matrix;
Below 0 matrix of basic matrix and increase, increase the sparse matrix He of a J capable (N+J) row again;
Form the enhancing check matrix H jointly by basic matrix, 0 matrix and sparse matrix He Enhanced
Sparse matrix H after basic matrix expanded EnhancedOrganigram as shown in Figure 3, wherein, strengthen check matrix H EnhancedComprise three parts:
First is the capable N row of M, i.e. the basic matrix Hbasic of M * N;
Second portion is the Ho matrix, i.e. 0 matrix of M * J;
Third part is J capable (N+J) row He matrix, i.e. the sparse matrix of J * (N+J).
Like this, the enhancing check matrix H that obtains EnhancedSparse matrix for M ' row N ' row;
Wherein:
M '=M+J formula (1)
N '=N+J formula (2)
Step S103, employing strengthen check matrix H EnhancedThe MBMS business datum is carried out LDPC coding, the business datum of (N+J) the individual bit after obtaining encoding.
Wherein, in the MBMS business datum behind the coding, information bit K is:
K=N '-M '=(N+J)-(M+J)=N-M formula (3)
The check bit number is (M+J) individual bit.Promptly in the business datum of (N+J) the individual bit behind the coding, a preceding K bit is an information bit, and back (M+J) individual bit is a check bit.
Step S104, the business datum after will encoding are divided into the first information and second information, specifically comprise:
With the top n bit in the business datum of (N+J) individual bit behind the coding as the first information; With back J bit in the business datum of (N+J) the individual bit behind the described coding as described second information; Wherein, M, N and J are positive integer.
Step S105, the transmission first information and second information.
Concrete send mode for example adopts time division multiplexing mode to send the first information and second information.
Alternatively, comprise that also the corresponding running time-frequency resource indication information of the transmission and the first information and second information is to receiving terminal, so that receiving terminal, is determined the running time-frequency resource of the reception first information and the running time-frequency resource of second information of reception according to the running time-frequency resource indication information that receives.
The enhancing check matrix H that in described step S102, generates EnhancedOrganigram also can be as shown in Figure 4, the difference of itself and matrix construction shown in Figure 3 is:
The He matrix design is following triangle sparse matrix among Fig. 4, and the terminal of Fig. 4 intermediate cam shape hypotenuse correspondence is N row first element of sparse matrix He and last element of (N+J) row.The triangle hypotenuse each element of process be " 1 ", all the other " 1 " elements among this sparse matrix He all are arranged in the hatched example areas of this sparse matrix of Fig. 4 He, promptly in Bai Se the delta-shaped region all elements all be " 0 ".Adopt the enhancing check matrix H of structure shown in Figure 4 EnhancedCan adopt the mode of iteration to encode, thereby reduce encoder complexity.
Embodiment 2:
The basic principle that realizes is: construct a sparse matrix, be referred to as the 3rd sparse matrix for convenience of description, make and adopt the multimedia broadcast multicast data after the 3rd sparse matrix is encoded to be correctly decoded by the receiving terminal of channel circumstance difference; Adopt the 3rd sparse matrix that multimedia broadcast multicast data is carried out the LDPC coding, business datum behind the coding is divided into the first information and the transmission of second information, wherein, the first information is the partial bit in the business datum after encoding, for the good receiving terminal of channel circumstance, only need receive the first information can be correctly decoded, and obtains the transmission data of MBMS business.
The transmitting terminal that Fig. 5 provides for the embodiment of the invention 2 sends the flow chart of steps of MBMS business datum, specifically comprises:
The 3rd sparse matrix of the capable N row of step S401, M of structure makes and adopts the business datum of the multimedia broadcast-multicast service after the 3rd sparse matrix is encoded to be correctly decoded by the receiving terminal of channel circumstance difference.
The concrete building method of the 3rd sparse matrix can adopt various building method of the prior art, for example:
At first construct a same code rate but low dimension m b* n bMatrix H b, the 3rd sparse matrix that carries out the LDPC coding then passes through matrix H bExpansion forms.The criterion of expansion is a matrix H bIn element " 1 " replace H with certain suitable z * z dimension cyclic permutation matrices bIn element " 0 " then use 0 matrix of z * z to replace, i.e. H bP I, jOr the cyclic permutation matrices of a z * z, or 0 matrix of a z * z.
In this step S401, need to make the 3rd sparse matrix that constructs to satisfy: adopt the multimedia broadcast multicast data after the 3rd sparse matrix is encoded to be correctly decoded by the receiving terminal of channel circumstance difference, the channel circumstance difference can define less than characterizing the good corresponding threshold value of channel quality by the channel quality parameter value.For example: make SNR can be correctly decoded out multimedia broadcast multicast data behind employing the 3rd sparse matrix coding, certainly, also can characterize channel quality with other method less than the receiving terminal of setting threshold.Concrete setting threshold or threshold value can be consulted by network side and end side, also can according to circumstances set up back notice end side on their own by network side.
For the 3rd sparse matrix that comes out according to theory building, can adopt the mode of emulation or experiment to verify whether it satisfies condition.Also can adopt the means of emulation or experiment to determine the 3rd sparse matrix that satisfies condition.
The 3rd sparse matrix that step S402, employing construct carries out LDPC coding, the business datum of N bit after obtaining encoding to multimedia broadcast multicast data.
The business datum of step S403, N bit after will encoding is divided into the first information and second information, specifically comprises:
Back M bit in the business datum of N bit behind the coding is divided into first's bit and second portion bit;
With preceding (N-M) the individual bit in the business datum of N bit behind the coding, and first's bit is as the first information; With the second portion bit as described second information.
In this step S403, back M bit in the business datum of the bit of the N behind the coding is check bit, with M check bit separated into two parts, for example, comprise M1 check bit in the first, comprise M2 check bit, that is: M1+M2=M in the second portion;
Because preceding (N-M) the individual bit in the business datum of N bit behind the coding is K information bit, like this, comprising preceding (N-M) individual bit and M1 check bit in the business datum of N bit behind the coding in the first information, also is to comprise K information bit and M1 check bit in the first information; Comprise M2 check bit in second information.
Step S404, the transmission first information and second information.
Concrete send mode for example adopts time division multiplexing mode to send the first information and second information.
Alternatively, comprise that also the corresponding running time-frequency resource indication information of the transmission and the first information and second information is to receiving terminal, so that receiving terminal, is determined the running time-frequency resource of the reception first information and the running time-frequency resource of second information of reception according to the running time-frequency resource indication information that receives.
Embodiment 3:
The receiving terminal that Fig. 6 provides for the embodiment of the invention 3 receives MBMS business datum flow chart of steps; Specifically comprise:
Step S501, receiving terminal are judged self present located channel circumstance quality.
In this step S501, the channel circumstance quality can adopt multiple parameter to characterize.For example, can adopt signal to noise ratio snr to characterize the channel circumstance quality, when receiving terminal was judged current SNR greater than setting threshold, it was good to be defined as the channel circumstance quality; When SNR was less than or equal to setting threshold, it was of poor quality to be defined as channel circumstance.
Judge self present located channel circumstance quality when good when receiving terminal, adopt first kind to receive strategy, carry out the following step S502;
Judge self present located channel circumstance when of poor quality when receiving terminal, adopt second kind to receive strategy, carry out the following step S504.
The first information that step S502, receiving terminal send according to the running time-frequency resource receiving end/sending end of first information correspondence.
Wherein, the running time-frequency resource of first information correspondence is carried to the running time-frequency resource indication information that receiving terminal sends by transmitting terminal, after receiving terminal receives the running time-frequency resource indication information, can determine the running time-frequency resource that the first information takies, thus the first information that receiving end/sending end sends on corresponding running time-frequency resource.
At the method for the transmitting terminal transmission MBMS business datum that provides in the foregoing description 1, the first information strengthens check matrix H for adopting EnhancedCarry out the top n bit in the business datum of (N+J) the individual bit behind the LDPC coding;
At the method for the transmitting terminal transmission MBMS business datum that provides in the foregoing description 2, the first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC; Promptly comprise K information bit and M1 check bit after LDPC encodes.
Step S503, receiving terminal are decoded according to the first information that receives, and obtain the MBMS business datum that transmitting terminal sends.
Step S504, receiving terminal receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence.
Wherein, the running time-frequency resource of the first information and the second information correspondence is carried to the running time-frequency resource indication information that receiving terminal sends by transmitting terminal, after receiving terminal receives the running time-frequency resource indication information, can determine the running time-frequency resource that the first information and second information take, thus receiving end/sending end sends on corresponding running time-frequency resource the first information and second information.
At the method for the transmitting terminal transmission MBMS business datum that provides in the foregoing description 1, the first information strengthens check matrix H for adopting EnhancedCarry out the top n bit in the business datum of (N+J) the individual bit behind the LDPC coding; Second information strengthens check matrix H for adopting EnhancedCarry out back J bit in the business datum of (N+J) the individual bit behind the LDPC coding;
At the method for the transmitting terminal transmission MBMS business datum that provides in the foregoing description 2, the first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC; Promptly comprise K information bit and M1 check bit after LDPC encodes; Second information promptly comprises M2 check bit for removing all the other outer bits of the described first information in the multimedia broadcast multicast data after encoding.
Step S505, receiving terminal are decoded according to the first information and second information that receive, obtain the MBMS business datum that transmitting terminal sends.
By the foregoing description 3 as can be known, receiving terminal is judged self present located channel circumstance earlier when receiving the MBMS business datum, adopt different reception strategies according to different channel circumstances.When channel circumstance was good, the check bit behind the LDPC of the reception coding was less and can correctly decode the MBMS business datum effectively equally, therefore, when guaranteeing the quality of reception, owing to reduced the check bit that receives the decode, thereby reduced time of reception, reduced the reception energy consumption.And, decode the MBMS business datum, thereby guaranteed the quality of reception of MBMS business datum by information bit and check bit behind the LDPC coding of whole receiving end/sending ends transmissions for the relatively poor receiving terminal of channel circumstance.
According to the MBMS business datum sending method that the above embodiment of the present invention provides, the embodiment of the invention also provides a kind of base station 70, and its structural representation comprises as shown in Figure 7:
Coding unit 701 is used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data;
Processing unit 702 is used for the business datum behind coding unit 701 codings is divided into the first information and second information;
Transmitting element 703 is used to send the first information and second information that processing unit 702 is divided into.
Preferably, coding unit 701 further comprises:
Matrix construction subelement 7011 is used to construct the sparse matrix that carries out the LDPC coding;
Coding is carried out subelement 7012, is used to adopt the sparse matrix of the second matrix construction subelement, 7011 structures that multimedia broadcast multicast data is encoded.
According to the MBMS business datum method of reseptance that the above embodiment of the present invention provides, the embodiment of the invention provides a kind of portable terminal 80 again, and its structural representation comprises as shown in Figure 8:
Judging unit 801 is used to judge self present located channel circumstance quality; When self present located channel quality parameter value when characterizing the good corresponding threshold value of channel quality, start first receiving element 802; When self present located channel quality parameter value when characterizing the good corresponding threshold value of channel quality, start second receiving element 803;
First receiving element 802 is according to the running time-frequency resource reception first information of first information correspondence;
Wherein, the described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
Second receiving element 803 receives the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence;
Wherein the first information is a part of bit of the multimedia broadcast multicast data behind the employing LDPC coding that sends of transmitting terminal, removes all the other outer bits of the described first information in the multimedia broadcast multicast data of second information after for coding.
Preferably, portable terminal 80 can also comprise:
The 3rd receiving element, be used for that receiving end/sending end sends with the described first information and the corresponding running time-frequency resource indication information of second information, determine and the first information and the corresponding running time-frequency resource of second information.
According to base station and the portable terminal that the above embodiment of the present invention provides, yet another embodiment of the invention also provides a kind of multimedia broadcast-multicast service transmission system, comprises above-mentioned base station and portable terminal, wherein:
Described base station is used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data, and the business datum behind the coding is sent to portable terminal after being divided into the first information and second information;
Described portable terminal is used to judge self present located channel circumstance quality; When self present located channel circumstance is good, receive the first information according to the running time-frequency resource of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
When self present located channel circumstance difference, receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
In sum, the embodiment of the invention adopts the LDPC sign indicating number to encode multimedia broadcast multicast data; Business datum behind the coding is sent to receiving terminal after being divided into the first information and second information.Receiving terminal is judged self present located channel circumstance quality, when self present located channel circumstance good (the mass parameter value is more than or equal to characterizing the good corresponding threshold value of channel quality), according to the running time-frequency resource reception first information of first information correspondence; When self present located channel circumstance poor (the mass parameter value is less than characterizing the good corresponding threshold value of channel quality), receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence.Like this,,, only need to receive the first information and can finish data demodulates smoothly, do not need to receive again second information, therefore reduced time of reception, reduced the reception energy consumption because higher signal to noise ratio (snr) is arranged for the good receiving terminal of channel circumstance.For the receiving terminal of channel circumstance difference, because SNR is lower, after receiving the first information and second information, carry out combined decoding, obtain the MBMS business datum that transmitting terminal sends, thereby guaranteed the quality of reception of MBMS business.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (17)

1. a multimedia broadcast multicast data sending delivery method is characterized in that, comprising:
Construct first sparse matrix of the capable N row of M, make and adopt the multimedia broadcast multicast data after described first sparse matrix is encoded to be correctly decoded more than or equal to the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio;
Described first sparse matrix is expanded, generated second sparse matrix of the capable N+J row of M+J;
Adopt described second sparse matrix that multimedia broadcast multicast data is carried out LDPC coding, the business datum of N+J bit after obtaining encoding;
With the top n bit in the data of the bit of the N+J behind the described coding as the first information;
As second information, wherein, M, N and J are positive integer with back J bit in the data of the bit of the N+J behind the described coding;
Send the described first information and second information.
2. the method for claim 1 is characterized in that, also comprises:
When sending the described first information and second information, send and the described first information and the corresponding running time-frequency resource indication information of second information in the lump.
3. the method for claim 1 is characterized in that, described first sparse matrix is expanded, and generates second sparse matrix of the capable N+J row of M+J, specifically comprises:
Increase by 0 matrix of the capable J row of M on the right side of described first sparse matrix;
Below described first sparse matrix and described 0 matrix, increase the sparse matrix He of the capable N+J row of J;
Form described second sparse matrix jointly by described first sparse matrix, described 0 matrix and described sparse matrix He.
4. method as claimed in claim 3 is characterized in that, described sparse matrix He is following triangle sparse matrix; Wherein the terminal of triangle hypotenuse correspondence is N row first element of described sparse matrix He and last element of N+J row.
5. as claim 1,3 or 4 described methods, it is characterized in that, multimedia broadcast multicast data behind described feasible employing first sparse matrix coding can be correctly decoded more than or equal to the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio, is specially:
Make signal to noise ratio can be correctly decoded multimedia broadcast multicast data behind described employing first sparse matrix coding more than or equal to the receiving terminal of setting threshold.
6. a multimedia broadcast multicast data sending delivery method is characterized in that, comprising:
Construct the 3rd sparse matrix of the capable N row of M, make the business datum that adopts the multimedia broadcast-multicast service after described the 3rd sparse matrix is encoded to be correctly decoded less than the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio;
Adopt described the 3rd sparse matrix that multimedia broadcast multicast data is carried out LDPC coding, the business datum of N bit after obtaining encoding;
Back M bit in the business datum of the bit of the N behind the described coding is divided into first's bit and second portion bit;
With preceding N-M bit in the business datum of the bit of the N behind the described coding, and described first bit is as the first information;
As second information, wherein, M, N are positive integer with described second portion bit;
Send the described first information and second information.
7. method as claimed in claim 6 is characterized in that, also comprises:
When sending the described first information and second information, send and the described first information and the corresponding running time-frequency resource indication information of second information in the lump.
8. method as claimed in claim 7 is characterized in that, the business datum of the multimedia broadcast-multicast service behind described feasible employing the 3rd sparse matrix coding can be correctly decoded less than the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio, is specially:
Make signal to noise ratio can be correctly decoded multimedia broadcast multicast data behind described employing the 3rd sparse matrix coding less than the receiving terminal of setting threshold.
9. a multimedia broadcast multicast data method of reseptance is characterized in that, comprising:
Receiving terminal is judged self present located channel circumstance quality;
When self current signal to noise ratio when characterizing the good corresponding threshold value of channel quality, receive the first information according to the running time-frequency resource of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
When self current signal to noise ratio when characterizing the good corresponding threshold value of channel quality, receive the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
10. method as claimed in claim 9 is characterized in that, also comprises:
Receiving end/sending end send with the described first information and the corresponding running time-frequency resource indication information of second information, determine and the first information and the corresponding running time-frequency resource of second information.
11. a base station is characterized in that, comprising:
Coding unit, be used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data, be specially: construct first sparse matrix of the capable N row of M, make and adopt the multimedia broadcast multicast data after described first sparse matrix is encoded to be correctly decoded more than or equal to the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio; Described first sparse matrix is expanded, generated second sparse matrix of the capable N+J row of M+J; Adopt described second sparse matrix that multimedia broadcast multicast data is carried out LDPC coding, the business datum of N+J bit after obtaining encoding;
Processing unit, be used for the coding after business datum be divided into the first information and second information, be specially: with the top n bit in the data of the bit of the N+J behind the described coding as the described first information; As described second information, wherein, M, N and J are positive integer with back J bit in the data of the bit of the N+J behind the described coding;
Transmitting element is used to send the described first information and second information.
12. base station as claimed in claim 11 is characterized in that, described coding unit further comprises:
The matrix construction subelement is used to construct the sparse matrix that carries out the LDPC coding;
Coding is carried out subelement, is used to adopt the sparse matrix of structure that multimedia broadcast multicast data is encoded.
13. a base station is characterized in that, comprising:
Coding unit, be used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data, be specially: construct the 3rd sparse matrix of the capable N row of M, make the business datum that adopts the multimedia broadcast-multicast service after described the 3rd sparse matrix is encoded to be correctly decoded less than the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio; Adopt described the 3rd sparse matrix that multimedia broadcast multicast data is carried out LDPC coding, the business datum of N bit after obtaining encoding;
Processing unit is used for the business datum behind the coding is divided into the first information and second information, is specially: back M bit in the business datum of the bit of the N behind the described coding is divided into first's bit and second portion bit; With preceding N-M bit in the business datum of the bit of the N behind the described coding, and described first bit is as the described first information; As described second information, wherein, M, N are positive integer with described second portion bit;
Transmitting element is used to send the described first information and second information.
14. base station as claimed in claim 13 is characterized in that, described coding unit further comprises:
The matrix construction subelement is used to construct the sparse matrix that carries out the LDPC coding;
Coding is carried out subelement, is used to adopt the sparse matrix of structure that multimedia broadcast multicast data is encoded.
15. a portable terminal is characterized in that, comprising:
Judging unit is used to judge self present located channel circumstance quality; When self current signal to noise ratio when characterizing the good corresponding threshold value of channel quality, start first receiving element; When self current signal to noise ratio when characterizing the good corresponding threshold value of channel quality, start second receiving element;
First receiving element is according to the running time-frequency resource reception first information of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC;
Second receiving element receives the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
16. portable terminal as claimed in claim 15 is characterized in that, also comprises:
The 3rd receiving element, be used for that receiving end/sending end sends with the described first information and the corresponding running time-frequency resource indication information of second information, determine and the first information and the corresponding running time-frequency resource of second information.
17. a multimedia broadcast-multicast service transmission system comprises base station and portable terminal, it is characterized in that,
Described base station comprises: coding unit, be used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data, be specially: construct first sparse matrix of the capable N row of M, make and adopt the multimedia broadcast multicast data after described first sparse matrix is encoded to be correctly decoded more than or equal to the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio; Described first sparse matrix is expanded, generated second sparse matrix of the capable N+J row of M+J; Adopt described second sparse matrix that multimedia broadcast multicast data is carried out LDPC coding, the business datum of N+J bit after obtaining encoding; Processing unit, be used for the coding after business datum be divided into the first information and second information, be specially: with the top n bit in the data of the bit of the N+J behind the described coding as the described first information; As described second information, wherein, M, N and J are positive integer with back J bit in the data of the bit of the N+J behind the described coding; Transmitting element is used to send the described first information and second information; Or
Described base station comprises: coding unit, be used for adopting low density parity check code LDPC sign indicating number to encode multimedia broadcast multicast data, be specially: construct the 3rd sparse matrix of the capable N row of M, make the business datum that adopts the multimedia broadcast-multicast service after described the 3rd sparse matrix is encoded to be correctly decoded less than the receiving terminal that characterizes the good corresponding threshold value of channel quality by signal to noise ratio; Adopt described the 3rd sparse matrix that multimedia broadcast multicast data is carried out LDPC coding, the business datum of N bit after obtaining encoding; Processing unit is used for the business datum behind the coding is divided into the first information and second information, is specially: back M bit in the business datum of the bit of the N behind the described coding is divided into first's bit and second portion bit; With preceding N-M bit in the business datum of the bit of the N behind the described coding, and described first bit is as the described first information; As described second information, wherein, M, N are positive integer with described second portion bit; Transmitting element is used to send the described first information and second information;
Described portable terminal comprises: judging unit is used to judge self present located channel circumstance quality; When self current signal to noise ratio when characterizing the good corresponding threshold value of channel quality, start first receiving element; When self current signal to noise ratio when characterizing the good corresponding threshold value of channel quality, start second receiving element; First receiving element is according to the running time-frequency resource reception first information of first information correspondence; The described first information is the partial bit after transmitting terminal is encoded to multimedia broadcast multicast data employing LDPC; Second receiving element receives the first information and second information respectively according to the running time-frequency resource of the first information and the second information correspondence; The described first information is a part of bit of the multimedia broadcast multicast data after the employing LDPC of transmitting terminal transmission encodes, and described second information is for removing all the other bits outside the described first information in the multimedia broadcast multicast data after encoding.
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