CN101340609A - Broadcast multicast service transmitting method, apparatus and system - Google Patents

Broadcast multicast service transmitting method, apparatus and system Download PDF

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Publication number
CN101340609A
CN101340609A CNA2007100434180A CN200710043418A CN101340609A CN 101340609 A CN101340609 A CN 101340609A CN A2007100434180 A CNA2007100434180 A CN A2007100434180A CN 200710043418 A CN200710043418 A CN 200710043418A CN 101340609 A CN101340609 A CN 101340609A
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China
Prior art keywords
antenna
multicast service
mcs
broadcast multicast
encoding block
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CN101340609B (en
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刘晟
葛绍伟
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Huawei Technologies Co Ltd
Shanghai Huawei Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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Priority to CN2007100434180A priority Critical patent/CN101340609B/en
Priority to PCT/CN2008/071519 priority patent/WO2009003415A1/en
Publication of CN101340609A publication Critical patent/CN101340609A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to the field of wireless communication, which discloses a broadcast multi-cast service distribution method, equipment and a system thereof. In the invention, when multiple code word MIMO transmission is adopted, the number of user terminals with poor MBMS service receiving performance is reduced and the coverage rate of an MBMS service is improved by dynamically changing an antenna mapping matrix or an MCS corresponding to each code word. The method, the equipment and the system of the invention can dynamically change the antenna mapping matrix in a time domain as well as in a frequency domain and also can simultaneously change the antenna mapping matrix in the time domain and the frequency domain.

Description

Broadcast multicast service transmitting method, equipment and system
Technical field
The present invention relates to wireless communication field, particularly wireless broadcast multi-broadcasting technology.
Background technology
Multimedia broadcast/group broadcast service (Multimedia Broadcast/Multicast Service is called for short " MBMS ") has vast market prospect.MBMS is that the base station sends data on the resource of appointment, and this data pin is to a plurality of users, and different user can receive the multicast service of base station broadcast as required.
When MBMS is professional when adopting the single frequency network mode transfer, because the user need receive the signal that different base station sends, and that the distance between base station and the user may differ is bigger, thereby cause signal to arrive the user time difference, cause that than long time delay wherein, the single frequency network mode transfer as shown in Figure 1.Yet OFDM (Orthogonal Frequency Division Multiplexing, be called for short " OFDM ") technology will be transmitted on the parallel a plurality of subcarriers that are modulated at overlapping quadrature each other of the data symbol that be transmitted.Therefore, when the networking of the professional employing of MBMS single frequency network pattern, using the OFDM technology is more preferably to select as transmission means, and can get long Cyclic Prefix usually.
Multiple-input and multiple-output (Multiple Input Multiple Output is called for short " MIMO ") technology has the raising spectrum efficiency, obtains advantages such as diversity gain and minimizing interference.The MIMO technology comprises space diversity and spatial reuse etc., and spatial reuse is the parallel different pieces of information that sends on many transmitting antennas.Fig. 2 is a spatial reuse example, wherein, sends symbol S1 and S2 respectively on antenna 1 and 2 same asset, and receiving terminal carries out demodulation by many reception antennas, isolates two symbols.
Spatial reuse has multiple mode, and wherein many code words (multi code word is called for short " MCW ") are one of them.The MCW mode is a plurality of encoding blocks of parallel transmission on a plurality of antennas, and each encoding block adopts independently code rate, modulation system and cyclic redundancy check (CRC) (Cyclic Redundancy Check is called for short " CRC ").Fig. 3 is the simple examples of many code words MIMO, after data flow 1 adds CRC, through sending at antenna 1 after the coded modulation, after data flow 2 adds CRC equally, sends at antenna 2 after the process coded modulation.Transmitting terminal adopts many code words to send, and then competent terminal can adopt complicated code word interference cancellation algorithm to improve receptivity.
When many code words multi-antenna transmitting is defeated, interference eliminated can adopt method for eliminating serial interference (SIC), utilize the decoding performance of code word to guarantee the interference eliminated effect, its step simply is described as: 1. receiving terminal is according to certain criterion decision decoding order, received signal to noise ratio such as the Modulation and Coding Scheme that sends each code word (Modulation andCoding Scheme is called for short " MCS ") or each code word; 2. receiving terminal at first adopts equalization methods that the most preceding each symbol of code word of order is carried out demodulation, decoding then, CRC check; 3. decoded codeword information bit is carried out coded modulation again, the channel equivalent processes is duplicated the received signal of this code word, eliminates the character signal of duplicating from the receiving terminal received signal; 4. repeating step 2, until separating a last code word.Because the restituted signal of a back code word has been eliminated the interference of previous code word, improved it and received signal interference ratio, thereby improved its receptivity.Here the interference eliminated by encoding block can reduce the error of interference replica, elimination by the decoding performance of code word.Therefore, many code words multi-antenna transmitting transmission ﹠ distribution splice grafting receiving end adopts the SIC method, can effectively improve receptivity, perhaps improves transmission capacity.
Fig. 4 is the simple examples of many code words MIMO in conjunction with the OFDM technology.After N circuit-switched data flow point does not carry out coded modulation, behind (/ frequently) coding module, obtain M road signal during by sky, M road signal is mapped to respectively on the designate sub, after the OFDM modulation, sends on M root antenna, and N is less than or equal to M generally speaking.N=M=2 among Fig. 3, (/ frequently) coding module is simple when empty S 1 S 2 .
Proposed to adopt in E-MBMS many code word space multiplexing at present, can adopt different code modulation modes or power between the different code words, its configuration cycle is a quasistatic, and promptly its configuration cycle just can change for a long time.
Yet the present inventor finds, if adopt quasistatic or static state that code modulation mode is set, certain terminal may occur and can't accurately receive business datum in a period of time, causes the relatively poor phenomenon of receptivity to occur.For example, suppose that many code words MCS form of setting is that (the code word number is 2 for MCS 1 and MCS2, corresponding first code word of MCS1, such as being QPSK and 1/3 coding, MCS2 is 16QAM and 2/3 coding), be optimum combination for user 1 sometime, but but be not for user 2, the MCS2 respective channels situation of supposing user 2 is better than MCS 1, if user's 2 translational speeds cause channel variation very little slowly, then Gu Ding MCS form can cause user's 2 receptivities lasting undesirable.
Summary of the invention
The technical problem underlying that embodiment of the present invention will solve provides a kind of broadcast multicast service transmitting method, equipment and system, can avoid user terminal to the long-time condition of severe of the receptivity of BroadCast MultiCast Service.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of broadcast multicast service transmitting method, may further comprise the steps:
Dynamically change the Modulation and Coding Scheme MCS of M encoding block correspondence in time, wherein M encoding block distinguished corresponding M independently MCS, M＞1;
M the MCS that uses warp dynamically to change carries out coded modulation to M circuit-switched data stream respectively and obtains M encoding block, this M encoding block uses the parallel transmission of identical resource on L antenna, wherein has circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least, L 〉=M.
Embodiments of the present invention also provide a kind of broadcast multicast service transmitting method, may further comprise the steps:
Adopt the individual independently MCS of M that M circuit-switched data stream is carried out coded modulation and obtain M encoding block, wherein have circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least, M＞1;
M encoding block is mapped to parallel transmission the on L the antenna by dynamic antenna mapping mode, and wherein the resource of L the parallel transmission use of antenna is identical, L 〉=M.
Embodiments of the present invention also provide a kind of BroadCast MultiCast Service transmitting apparatus, comprise L antenna, and L 〉=M wherein also comprises:
The MCS adjustment unit is used for dynamically changing in time the MCS of M encoding block correspondence, wherein M＞1;
The coded modulation unit is used for respectively M circuit-switched data stream being carried out coded modulation according to M the MCS that the MCS adjustment unit is determined, wherein has circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least;
Transmitter unit is used for M encoding block of coded modulation unit output used the parallel transmission of identical resource on L antenna.
Embodiments of the present invention also provide a kind of BroadCast MultiCast Service transmitting apparatus, comprise L antenna, and L 〉=M wherein also comprises:
The coded modulation unit is used for respectively M circuit-switched data stream being carried out coded modulation according to the individual independently MCS of M, wherein has circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least, M＞1;
Antenna mapping adjustment unit is used for dynamically changing the antenna mapping mode;
The antenna map unit is used for handling from the antenna mapping mode that the signal that M encoding block obtains is determined through antenna mapping adjustment unit, obtains the emission vector;
Transmitter unit is used for the emission vector of antenna map unit output is used the parallel transmission of identical resource by L antenna.
Embodiments of the present invention also provide a kind of BroadCast MultiCast Service transmitting system, comprise K BroadCast MultiCast Service transmitting apparatus as indicated above, wherein, K＞1, K BroadCast MultiCast Service transmitting apparatus uses identical resource to send identical signal.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
When adopting many code words MIMO transmission, by the MCS of each encoding block correspondence of dynamic change, reduced quantity to the user terminal of the professional receptivity difference of MBMS, improved the coverage rate of MBMS business.Because the MBMS business is less than feedback, and the while is at a plurality of user terminals, so can't select suitable MCS according to the channel situation of user terminal feedback.By the MCS of each encoding block correspondence of dynamic change, can avoid certain user's terminal to be positioned at the MCS compound mode of poor reception performance for a long time.
Description of drawings
Fig. 1 is the professional single frequency network mode transfer schematic diagram that adopts of MBMS in the prior art;
Fig. 2 is a multiplexing transmission schematic diagram in space in the prior art;
Fig. 3 is many code words MIMO transmission schematic diagram in the prior art;
Fig. 4 be in the prior art many code words MIMO and OFDM technology in conjunction with the transmission schematic diagram;
Fig. 5 adopts the broadcast multicast service transmitting method flow chart that dynamically changes MCS in the first embodiment of the invention;
Fig. 6 replaces schematic diagram between the MCS of different code words in the first embodiment of the invention;
Fig. 7 is a running time-frequency resource mapping schematic diagram in the second embodiment of the invention;
Fig. 8 is that the antenna mapping matrix changes schematic diagram with resource dynamic in the second embodiment of the invention;
Fig. 9 adopts the broadcast multicast service transmitting method flow chart that dynamically changes the antenna mapping matrix in the second embodiment of the invention;
Figure 10 adopts the BroadCast MultiCast Service transmitting apparatus structure chart that dynamically changes MCS in the third embodiment of the invention;
Figure 11 adopts the BroadCast MultiCast Service transmitting apparatus structure chart that dynamically changes the antenna mapping matrix in the four embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make embodiment of the present invention is clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First execution mode of the present invention relates to a kind of broadcast multicast service transmitting method, in the present embodiment, dynamically change the Modulation and Coding Scheme MCS of M encoding block correspondence in time, wherein M encoding block distinguished corresponding M independently MCS, and M＞1, M the MCS that uses warp dynamically to change carries out coded modulation to M circuit-switched data stream respectively and obtains M encoding block, this M encoding block uses the parallel transmission of same asset on L antenna, wherein have circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least, and L 〉=M.Idiographic flow as shown in Figure 5.
In step 510,, dynamically change the Modulation and Coding Scheme MCS of M encoding block correspondence in time according to predefined M MCS various combination and regular by turns.Specifically, at first define M MCS various combination and regular by turns, then, the MCS of M encoding block correspondence is once changed every N Transmission Time Interval (TransmissionTiming Interval is called for short " TTI ").Wherein, N is a positive integer.
Such as, as shown in Figure 6, always have three code words, so pre-defined 3 MCS and regular by turns.Wherein 3 MCS are respectively MCS1, MCS2 and MCS3, different MCS has different received signal to noise ratio thresholdings, for example: MCS1 adopts quadrature conversion phase key (Quadrature Phase shift Keying, be called for short " QPSK ")+1/3 coding, MCS2 adopts the QPSK+2/3 coding, and MCS3 adopts 16 quadrature amplitude modulations (Quadrature Amplitude Modulation is called for short " QAM ")+2/3 coding.Wherein substitute mode can be followed predefined rule, and can be unit with TTI period of a permutation, can be unit with a plurality of TTI also.When first TTI, the compound mode that code word adopts is: code word 1 adopts MCS1, and code word 2 adopts MCS2 and code word 3 to adopt MCS3; During next one TTI, the compound mode that code word adopts is: code word 1 adopts MCS3, and code word 2 adopts MCS1 and code word 3 to adopt MCS2; During the 3rd TTI, the compound mode that code word adopts is: code word 1 adopts MCS2, and code word 2 adopts MCS3 and code word 3 to adopt MCS1, and the like.
This shows, by pre-defined a plurality of MCS, their various combination is periodically rotated at a plurality of encoding blocks, for different terminals, the compound mode of the different MCS of possibility is optimum, for example terminal 1 optimum combination mode is when first TTI, performance may descend when second and the 3rd TTI, though sacrificed the receptivity of part terminal like this, but it has avoided some terminal to be positioned at the MSC compound mode of poor reception performance for a long time, so it guarantees the fairness to different user terminals and different business preferably.
Then, enter step 520, M the MCS that uses warp dynamically to change carries out coded modulation to M circuit-switched data stream respectively and obtains M encoding block.Wherein has circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least.
In step 530, M the encoding block that encoded modulation is obtained uses the parallel transmission of identical resource on L antenna.Said in the embodiment of the present invention " identical resource " comprises identical time resource, identical frequency resource, identical sign indicating number resource or the like.
Be not difficult to find, when adopting many code words MIMO transmission,, reduced quantity, improved the coverage rate of MBMS business the user terminal of the professional receptivity difference of MBMS by the MCS of each encoding block correspondence of dynamic change.
Second execution mode of the present invention relates to a kind of broadcast multicast service transmitting method equally, in the present embodiment, adopt the individual independently MCS of M that M circuit-switched data stream is carried out coded modulation and obtain M encoding block, wherein have circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least, and M＞1; M encoding block is mapped to parallel transmission the on L the antenna by dynamic antenna mapping mode, and wherein the resource of L the parallel transmission use of antenna is identical, and L 〉=M.
For fear of the received signal to noise ratio difference of different code words, can make signal to noise ratio of equal value identical as far as possible by scheduling of resource.Because wireless channel multipath and terminal moving influence, channel has frequency selectivity and time selectivity, and channel relevancy and frequency interval and the time interval are inversely proportional to.Therefore, when running time-frequency resource shines upon, make the running time-frequency resource of distinct symbols correspondence be separated by far away as far as possible.Here, the resource mapping can generate according to predefined rule, and as shown in Figure 7, the method for mapping resource of different TTI also can be different, and these resource mapping principles are transferred to terminal by the control signaling.But there is another situation, limited when the resource bandwidth or the time interval of the professional transmission of MBMS, when perhaps not obvious and moving velocity of terminal is slow to the selectivity of channel frequency of terminal in the base station, like this, can not reach the purpose of equalization code word signal to noise ratio by the running time-frequency resource mapping method.At this moment, also can finish said function, as shown in Figure 8 by the method for change antenna mapping matrix.Its idiographic flow as shown in Figure 9.
In step 910, on resource, dynamically change the antenna mapping mode.When dynamically changing at every turn, pressing pre-defined rule at least in predefined two kinds of antenna mapping modes selects an antenna mapping mode different with current antenna mapping mode as new antenna mapping mode, wherein, the antenna mapping mode can be got unitary matrice as transformation matrix.When matrix A satisfies A HA=AA HDuring=I, claim that so matrix A is a unitary matrice, wherein matrix I is a unit matrix.Specifically, preestablish at least two kinds of antenna mapping modes, and in these mapping modes, press pre-defined rule and select the different antenna mapping mode of a kind of and current antenna mapping mode as new antenna mapping mode.
Be appreciated that the antenna mapping mode uses unitary matrice as transformation matrix, can when receiving, eliminate the influence of transformation matrix easily, be convenient to the processing of receiving terminal by the inverse matrix that multiply by this unitary matrice.
Can produce different transformation matrixs by different substitute modes, as: P 1 = 1 0 0 1 · U , P 2 = 0 1 1 0 · U ; Perhaps can produce different transformation matrixs by out of phase, as: P 1 = e j θ 1 1 0 0 e j θ 2 1 · U , P 2 = e j θ 1 2 0 0 e j θ 2 2 · U , P 3 = e j θ 1 3 0 0 e j θ 2 3 · U ; Perhaps can be by getting the little different unitary matrice of correlation as transformation matrix, as P 1=U 1, P 2=U 2, P 3=U 3, wherein unitary matrice U can get unit matrix, discrete Fourier transform (DFT) (Discrete Fourier Transformation is called for short " DFT ") matrix and Hadamard matrix or the like.
In this step, dynamically changing the antenna mapping matrix can carry out in time domain, such as, mapping matrix of each OFDM symbol change.For example adopt matrix P at first OFDM symbol 1As mapping matrix, adopt matrix P at second OFDM symbol so 2As mapping matrix, adopt matrix P at the 3rd OFDM symbol 3As mapping matrix, the rest may be inferred.Can certainly be every mapping matrix of a plurality of OFDM symbol changes.
The dynamic change of antenna mapping matrix can also be carried out in frequency domain in this step, such as, every mapping matrix of several subcarrier changes.For example, suppose that number of transmit antennas is that the symbol of 2, two code words is respectively X (X 1, X 2, X 3...) and Y (Y 1, Y 2, Y 3...), code word is at subcarrier f 1, f 2, f 3... go up transmission, and permutation matrix adopts P 1 = 1 0 0 1 With P 2 = 0 1 1 0 . Subcarrier f so 1Adopt permutation matrix P 1, subcarrier f 2Adopt permutation matrix P 2, subcarrier f 3Adopt permutation matrix P 1, the rest may be inferred.At this moment, two code-word symbol alternately send on two antennas, i.e. antenna 1 subcarrier f 1Transmission symbol X 1, antenna 2 subcarrier f 1Transmission symbol Y 1, antenna 1 subcarrier f 2Transmission symbol Y 2, antenna 2 subcarrier f 2Transmission symbol X 2, the rest may be inferred.
Need to prove that this step can also adopt in time domain and frequency domain and dynamically change the antenna mapping matrix simultaneously.This shows that because the mode of multiple dynamic change antenna mapping matrix has been arranged, optimal scheme can be selected according to concrete applied environment by manufacturer, thereby increased the flexibility that realizes.
After this enter step 920, adopt the individual independently MCS of M that M circuit-switched data stream is carried out coded modulation and obtain M encoding block, wherein have circuit-switched data stream carrying MBMS business in the M circuit-switched data stream at least, M＞1.
Then enter step 930, M encoding block is mapped on L the antenna by the determined antenna mapping mode of step 910, uses the parallel transmission of identical resource.
Be not difficult to find, the dynamic change of antenna mapping matrix is equivalent to the dynamic change of channel matrix on effect, even the resource bandwidth of the professional transmission of MBMS or the time interval is limited or the base station is not obvious or the user terminal translational speed is slow to the selectivity of channel frequency of terminal, reach the purpose of equalization code word signal to noise ratio by the dynamic change of antenna mapping matrix, thereby avoid certain user's terminal the long-time condition of severe of the receptivity of MBMS business.
Scheme in first execution mode and second by way of example also can in conjunction with, promptly dynamically change the antenna mapping matrix sometimes, change the MCS of each code word correspondence sometimes, perhaps dynamically change the MCS of antenna mapping matrix and each code word correspondence simultaneously for same system.
Need to prove, in each above-mentioned execution mode, need pre-define change cycle and changing mode, the base station can be by control signaling terminal, so that the reception of terminal like this.
Each above-mentioned execution mode is some common example, and the dynamic MCS that realizes by other technological means is provided with and the dynamic antenna mapping mode, still without departing from the spirit and scope of the present invention.
The 3rd execution mode of the present invention relates to a kind of BroadCast MultiCast Service transmitting apparatus, as shown in figure 10, comprises
L antenna.
The MCS adjustment unit is used for dynamically changing in time the MCS of M encoding block correspondence, M＞1 wherein, L 〉=M.
The coded modulation unit is used for respectively M circuit-switched data stream being carried out coded modulation according to M the MCS that the MCS adjustment unit is determined, wherein has circuit-switched data stream carrying BroadCast MultiCast Service in the M circuit-switched data stream at least.This coded modulation unit once changes every the MCS of N Transmission Time Interval to M encoding block correspondence, and wherein N is a positive integer.The MCS adjustment unit can be rotated the various combination of a predefined M MCS according to pre-defined rule on M encoding block.By pre-defined a plurality of MCS, their various combination is periodically rotated on a plurality of encoding blocks, can better guarantee fairness to different user terminals and different business.
Transmitter unit is used for M encoding block of coded modulation unit output used the parallel transmission of identical resource on L antenna, and wherein, transmitter unit can adopt the mode of OFDM modulation to launch.
When adopting many code words MIMO transmission, MCS by each encoding block correspondence of dynamic change, reduced quantity, improved the coverage rate of MBMS business, and avoided certain user's terminal to be positioned at the MCS compound mode of poor reception performance for a long time the user terminal of the professional receptivity difference of MBMS.
In addition, what deserves to be mentioned is that each unit in the present embodiment is logical block, in actual applications, various physics realization mode can be arranged, for example the coded modulation unit can be made up of M module, each resume module one circuit-switched data stream.
The 4th execution mode of the present invention relates to a kind of BroadCast MultiCast Service transmitting apparatus equally, as shown in figure 11, comprises:
L antenna.
The coded modulation unit is used for respectively M circuit-switched data stream being carried out coded modulation according to the individual independently MCS of M, wherein has circuit-switched data stream carrying MBMS business in the M circuit-switched data stream at least, M＞1, L 〉=M;
Antenna mapping adjustment unit is used for dynamically changing the antenna mapping mode;
The antenna map unit is used for handling from the antenna mapping mode that the signal that M encoding block obtains is determined through antenna mapping adjustment unit, obtains the emission vector;
Transmitter unit is used for the emission vector of antenna map unit output is used the parallel transmission of identical resource by L antenna.Wherein, antenna mapping adjustment unit dynamically changes the antenna mapping mode on different resource.
When adopting many code words MIMO transmission, by dynamic change antenna mapping mode, reduced quantity to the user terminal of the professional receptivity difference of MBMS, improved the coverage rate of MBMS business, and reach the purpose of equalization code word signal to noise ratio, thereby avoid certain user's terminal the long-time condition of severe of the receptivity of MBMS business.
In addition, what deserves to be mentioned is that each unit in the present embodiment is logical block, in actual applications, various physics realization mode can be arranged.
The 5th execution mode of the present invention relates to a kind of BroadCast MultiCast Service transmitting system, this system comes down to a MBMS single frequency network, individual comprising K as enforcement mode three described BroadCast MultiCast Service transmitting apparatus, wherein, K＞1, K BroadCast MultiCast Service transmitting apparatus uses identical resource to send identical signal.
The 6th execution mode of the present invention relates to a kind of BroadCast MultiCast Service transmitting system equally, this system comes down to a MBMS single frequency network, individual comprising X as enforcement mode four described BroadCast MultiCast Service transmitting apparatus, wherein, X＞1, X BroadCast MultiCast Service transmitting apparatus uses identical resource to send identical signal.
In sum, in embodiments of the present invention, when adopting many code words MIMO transmission,, reduced quantity, improved the coverage rate of MBMS business the user terminal of the professional receptivity difference of MBMS by the MCS of each encoding block correspondence of dynamic change.Because the MBMS business is less than feedback, and the while is at a plurality of user terminals, so can't select suitable MCS according to the channel situation of user terminal feedback.By the MCS of each encoding block correspondence of dynamic change, can avoid certain user's terminal to be positioned at the MCS compound mode of poor reception performance for a long time.
Pre-defined a plurality of MCS periodically rotates their various combination on a plurality of encoding blocks, can better guarantee the fairness to different user terminals and different business.
When adopting many code words MIMO transmission, by dynamic change antenna mapping matrix, reduced quantity to the user terminal of the professional receptivity difference of MBMS, improved the coverage rate of MBMS business.The dynamic change of antenna mapping matrix is equivalent to the dynamic change of channel matrix on effect, even the resource bandwidth of the professional transmission of MBMS or the time interval is limited or the base station is not obvious or the user terminal translational speed is slow to the selectivity of channel frequency of terminal, also can reach the purpose of equalization code word signal to noise ratio, thereby avoid certain user's terminal the long-time condition of severe of the receptivity of MBMS business by the dynamic change of antenna mapping matrix.
Promptly can dynamically change the antenna mapping matrix, also can change the antenna mapping matrix, can also change the antenna mapping matrix in time domain and Domain Dynamic simultaneously in Domain Dynamic in time domain.Multiple implementation makes manufacturer select optimal scheme according to concrete applied environment, thereby has increased the flexibility that realizes.
Use unitary matrice as the antenna mapping matrix, can when receiving, eliminate the influence of antenna mapping matrix easily, be convenient to the processing of receiving terminal by the inverse matrix that multiply by this unitary matrice.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (14)

1. a broadcast multicast service transmitting method is characterized in that, may further comprise the steps:
Dynamically change the Modulation and Coding Scheme MCS of M encoding block correspondence in time, wherein said M the individual independently MCS of the corresponding M of encoding block difference, M＞1;
Described M the MCS that uses warp dynamically to change carries out coded modulation to M circuit-switched data stream respectively and obtains M encoding block, this M encoding block uses the parallel transmission of identical resource on L antenna, has circuit-switched data stream carrying BroadCast MultiCast Service in the wherein said M circuit-switched data stream at least, L 〉=M.
2. broadcast multicast service transmitting method according to claim 1, it is characterized in that, in the step of the described MCS that dynamically changes M encoding block correspondence in time, the MCS to M encoding block correspondence once changes every N Transmission Time Interval, and wherein N is a positive integer.
3. broadcast multicast service transmitting method according to claim 1 and 2, it is characterized in that, in the step of the described MCS that dynamically changes M encoding block correspondence in time, on a described M encoding block, rotate the various combination of a predefined M MCS according to pre-defined rule.
4. a broadcast multicast service transmitting method is characterized in that, may further comprise the steps:
Adopt the individual independently MCS of M that M circuit-switched data stream is carried out coded modulation and obtain M encoding block, have circuit-switched data stream carrying BroadCast MultiCast Service in the wherein said M circuit-switched data stream at least, M＞1;
M encoding block is mapped to parallel transmission the on L the antenna by dynamic antenna mapping mode, and the resource that the parallel transmission of a wherein said L antenna is used is identical, L 〉=M.
5. broadcast multicast service transmitting method according to claim 4 is characterized in that, is mapped to by dynamic antenna mapping mode in the forwarding step that walks abreast on L the antenna at a described M encoding block, dynamically changes described antenna mapping mode on resource.
6. broadcast multicast service transmitting method according to claim 5, it is characterized in that, be mapped to by dynamic antenna mapping mode in the forwarding step that walks abreast on L the antenna at a described M encoding block, when dynamically changing at every turn, in predefined two kinds of antenna mapping modes, press pre-defined rule at least and select an antenna mapping mode different as new antenna mapping mode with current antenna mapping mode.
7. according to each described broadcast multicast service transmitting method in the claim 4 to 6, it is characterized in that described antenna mapping mode is that input signal obtains sending signal through after the linear transformation, sends signal and transmits on antenna.
8. broadcast multicast service transmitting method according to claim 7 is characterized in that described linear transformation is for to multiply each other with unitary matrice.
9. a BroadCast MultiCast Service transmitting apparatus comprises L antenna, and wherein L 〉=M is characterized in that, also comprises:
The MCS adjustment unit is used for dynamically changing in time the MCS of M encoding block correspondence, wherein M＞1;
The coded modulation unit is used for respectively M circuit-switched data stream being carried out coded modulation according to M the MCS that described MCS adjustment unit is determined, has circuit-switched data stream carrying BroadCast MultiCast Service in the wherein said M circuit-switched data stream at least;
Transmitter unit is used for M encoding block of described coded modulation unit output used the parallel transmission of identical resource on a described L antenna.
10. BroadCast MultiCast Service transmitting apparatus according to claim 9 is characterized in that, described MCS adjustment unit once changes every the MCS of N Transmission Time Interval to M encoding block correspondence, and wherein N is a positive integer.
11., it is characterized in that described MCS adjustment unit is rotated the various combination of a predefined M MCS according to pre-defined rule according to claim 9 or 10 described BroadCast MultiCast Service transmitting apparatus on a described M encoding block.
12. a BroadCast MultiCast Service transmitting apparatus comprises L antenna, wherein L 〉=M is characterized in that, also comprises:
The coded modulation unit is used for respectively M circuit-switched data stream being carried out coded modulation according to the individual independently MCS of M, has circuit-switched data stream carrying BroadCast MultiCast Service in the wherein said M circuit-switched data stream at least, M＞1;
Antenna mapping adjustment unit is used for dynamically changing the antenna mapping mode;
The antenna map unit is used for handling from the antenna mapping mode that the signal that M encoding block obtains is determined through antenna mapping adjustment unit, obtains the emission vector;
Transmitter unit is used for the emission vector of described antenna map unit output is used the parallel transmission of identical resource by described L antenna.
13. BroadCast MultiCast Service transmitting apparatus according to claim 12 is characterized in that, described antenna adjustment unit dynamically changes described antenna mapping mode on different resource.
14. a BroadCast MultiCast Service transmitting system is characterized in that, comprises K as claim 9 or 12 described BroadCast MultiCast Service transmitting apparatus, wherein, K＞1, described K BroadCast MultiCast Service transmitting apparatus uses identical resource to send identical signal.
CN2007100434180A 2007-07-04 2007-07-04 Broadcast multicast service transmitting method, apparatus and system Expired - Fee Related CN101340609B (en)

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CN102186147A (en) * 2011-05-16 2011-09-14 大唐移动通信设备有限公司 Multimedia broadcast and multicast service (MBMS) data stream transmission method, base station and user equipment (UE)
CN112153514A (en) * 2020-09-24 2020-12-29 恒玄科技(上海)股份有限公司 Wireless earphone for wireless communication, wireless communication method and medium

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CN1805304A (en) * 2005-01-11 2006-07-19 松下电器产业株式会社 Adaptive multi-antenna system and its layer-span method

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CN112153514A (en) * 2020-09-24 2020-12-29 恒玄科技(上海)股份有限公司 Wireless earphone for wireless communication, wireless communication method and medium

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