WO2009003415A9 - Procédé, dispositif et système de transmission de services de diffusion/multidiffusion multimédia - Google Patents

Procédé, dispositif et système de transmission de services de diffusion/multidiffusion multimédia Download PDF

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Publication number
WO2009003415A9
WO2009003415A9 PCT/CN2008/071519 CN2008071519W WO2009003415A9 WO 2009003415 A9 WO2009003415 A9 WO 2009003415A9 CN 2008071519 W CN2008071519 W CN 2008071519W WO 2009003415 A9 WO2009003415 A9 WO 2009003415A9
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WO
WIPO (PCT)
Prior art keywords
broadcast multicast
multicast service
antenna mapping
coding blocks
transmitting
Prior art date
Application number
PCT/CN2008/071519
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English (en)
Chinese (zh)
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WO2009003415A1 (fr
Inventor
Sheng Liu
Shaowei Ge
Original Assignee
Huawei Tech Co Ltd
Sheng Liu
Shaowei Ge
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Tech Co Ltd, Sheng Liu, Shaowei Ge filed Critical Huawei Tech Co Ltd
Publication of WO2009003415A1 publication Critical patent/WO2009003415A1/fr
Publication of WO2009003415A9 publication Critical patent/WO2009003415A9/fr

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Classifications

    • 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

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a wireless broadcast multicast technology.
  • the MBMS is a base station that transmits data on a specified resource. This data is for multiple users. Different users can receive multicast multicast services broadcast by the base station as needed.
  • OFDM Orthogonal Frequency Division Multiplexing
  • MIMO Multiple Input Multiple Output
  • MIM0 technology includes spatial diversity and spatial multiplexing, etc.
  • Spatial multiplexing is to transmit different data in parallel on multiple transmit antennas.
  • MCT multi code word
  • the MCT method transmits multiple coding blocks in parallel on multiple antennas, and each coding block uses independent coding. Code rate, modulation mode and Cyclic Redundancy Check (CRC).
  • FIG. 3 is a simple example of the multi-codeword MIM0. After the data stream 1 is added with the CRC, it is encoded and modulated and then transmitted on the antenna 1. The data stream 2 is also added with the CRC, and then encoded and modulated and transmitted to the antenna 2.
  • the transmitting end uses multiple codewords to transmit, and the capable terminal can use the complex codeword interference cancellation algorithm to improve the receiving performance.
  • interference cancellation can use the serial interference cancellation method (SIC), and the decoding performance of the codeword is used to ensure the interference cancellation effect.
  • the steps are simply described as follows: 1.
  • the receiving end determines the decoding order according to certain criteria. For example, a modulation coding scheme ("MCS") for each codeword or a received signal-to-noise ratio for each codeword is transmitted; 2.
  • MCS modulation coding scheme
  • the receiving end first uses the equalization method for the first-order codeword. Each symbol is demodulated, then decoded, CRC checked; 3.
  • the decoded codeword information bits are re-encoded and modulated, the channel is equivalently processed, the received signal of the codeword is copied, and the signal is received from the receiving end to eliminate the copying.
  • Codeword signal 4. Repeat step 2 until the last codeword is resolved. Since the demodulated signal of the latter codeword has eliminated the interference of the previous codeword, its reception signal to interference ratio is improved, thereby improving its reception performance.
  • the interference cancellation by the coding block can reduce the error of interference copying and cancellation by the decoding performance of the codeword. Therefore, the multi-code word multi-antenna transmission and the receiving end use the SIC method, which can effectively improve the receiving performance or increase the transmission capacity.
  • Figure 4 is a simple example diagram of the multi-code word MIM0 combined with OF Li technology.
  • the M-channel signal is obtained by the space-time (/frequency) coding module, and the M-channel signals are respectively mapped to the designated sub-carriers, and then transmitted through the M antennas by the OF-modulation.
  • N is less than or equal to
  • the space-time (/frequency) coding module is a simple one .
  • multi-code word space multiplexing is proposed in E-MBMS, and different code modulation modes or powers can be used between different code words, and the configuration period is quasi-static, that is, the configuration period is long. Variety.
  • the inventors of the present invention have found that if a quasi-static or static setting code modulation method is used, It may happen that a terminal cannot receive service data accurately for a period of time, resulting in poor reception performance.
  • MCS1 corresponds to the first codeword, such as QPSK and 1/3 encoding
  • MCS2 is 16QAM and 2/3 encoding
  • the moment is the optimal combination for User 1, but not for User 2, assuming that the channel condition of MCS2 of User 2 is better than MCS1. If the movement speed of User 2 is slow and the channel change is small, the fixed MCS format will cause the user. 2 Receive performance continues to be unsatisfactory.
  • the embodiments of the present invention provide a method, a device, and a system for transmitting a broadcast multicast service, which can avoid a situation in which the receiving performance of a broadcast multicast service by a user terminal is bad for a long time.
  • an embodiment of the present invention provides a method for transmitting a broadcast multicast service, including the following steps: dynamically changing a modulation and coding scheme MCS corresponding to M coding blocks, wherein M coding blocks respectively correspond to M Independent MCS, M>1; M-channel data streams are code-modulated using dynamically changed M MCS to obtain M coding blocks, which are transmitted in parallel on the L antennas using the same resources, where M At least one data stream in the road data stream carries the broadcast multicast service, L > M.
  • An embodiment of the present invention further provides a method for transmitting a broadcast multicast service, including the following steps: modulating and modulating an M-channel data stream by using M independent MCSs to obtain M coding blocks, where at least one of the M-channel data streams One way data stream carries broadcast multicast service, M>1;
  • the embodiment of the present invention further provides a broadcast multicast service sending device, including L antennas, where L > M, further includes:
  • the MCS adjusting unit is configured to dynamically change the MCS corresponding to the M coding blocks over time, where M>1; a code modulation unit, configured to code and modulate the M channel data stream according to the M MCSs determined by the MCS adjustment unit, where at least one data stream in the M channel data stream carries a broadcast multicast service; and a transmitting unit, configured to code and modulate The M code blocks output by the unit are transmitted in parallel on the L antennas using the same resources.
  • An embodiment of the present invention further provides a broadcast multicast service sending device, including L antennas, where L > M, further comprising: a code modulation unit for respectively encoding the M channel data streams according to the M independent MCSs Modulation, wherein at least one of the M data streams carries a broadcast multicast service, M>1; an antenna mapping adjustment unit for dynamically changing an antenna mapping manner; an antenna mapping unit, for obtaining signals from the M coding blocks
  • the antenna mapping method is determined by the antenna mapping adjustment unit to obtain a transmission vector.
  • the transmitting unit is configured to send the transmission vector output by the antenna mapping unit in parallel through the L antennas using the same resource.
  • An embodiment of the present invention further provides a broadcast multicast service sending system, including K broadcast multicast service sending devices as described above, where K>1, the one broadcast multicast service sending device uses the same The resource sends the same signal.
  • the MCS corresponding to each coding block When the multi-codeword ⁇ 0 transmission is used, by dynamically changing the MCS corresponding to each coding block, the number of user terminals with poor reception performance of the MBMS service is reduced, and the coverage of the MBMS service is improved. Because the MBMS service has no feedback and is directed to multiple user terminals, it is not possible to select an appropriate MCS based on the channel conditions fed back by the user terminal. By dynamically changing the MCS corresponding to each coding block, it is possible to avoid the MCS combination mode in which some user terminals are located in the worst reception performance for a long time.
  • FIG. 1 is a schematic diagram of transmission of a single frequency network mode in an MBMS service in the prior art
  • FIG. 2 is a schematic diagram of spatial multiplexing transmission in the prior art
  • FIG. 3 is a schematic diagram of transmission of multi-codeword MIM0 in the prior art
  • FIG. 4 is a schematic diagram of combined transmission of multi-codewords MIM0 and OFL technology in the prior art
  • FIG. 6 is a schematic diagram of replacement between MCSs of different codewords in the first embodiment of the present invention
  • FIG. 7 is a second embodiment of the present invention
  • FIG. 8 is a schematic diagram of a dynamic change of an antenna mapping matrix with resources in a second embodiment of the present invention
  • FIG. 9 is a method for transmitting a broadcast multicast service using a dynamically changing antenna mapping matrix in a second embodiment of the present invention
  • FIG. 10 is a structural diagram of a broadcast multicast service transmitting apparatus for dynamically changing an MCS according to a third embodiment of the present invention
  • FIG. 11 is a broadcast multicast service for dynamically changing an antenna mapping matrix in a fourth embodiment of the present invention
  • Send the device structure diagram
  • a first embodiment of the present invention relates to a method for transmitting a broadcast multicast service.
  • a modulation coding scheme MCS corresponding to M coding blocks is dynamically changed with time, where M coding blocks respectively correspond to M independent MCSs.
  • M>1 using the dynamically changed M MCSs to respectively encode and modulate the M data streams to obtain M coding blocks, and the M coding blocks are transmitted in parallel on the L antennas using the same resources, wherein the M channels are At least one of the data streams carries the broadcast multicast service, and L > M.
  • the specific process is shown in Figure 5.
  • the modulation coding scheme MCS corresponding to the M coding blocks is dynamically changed according to the time according to the different M MCS different combinations and the rotation rules. Specifically, firstly, different combinations of M MCSs and rotation rules are defined, and then MCS corresponding to each coding block is changed once every N transmission time intervals ("TTI"). Where N is a positive integer.
  • MCS1 uses Quadrature Phase Shift Keying (QPSK) +1/3 encoding.
  • MCS2 uses QPSK+2/3 encoding, and MCS 3 uses 16 Quadrature Amplitude Modulation (QAM) +2/3 encoding.
  • QAM Quadrature Amplitude Modulation
  • the replacement method may follow a predefined rule, and the replacement period may be in units of TTI or multiple TTIs.
  • the combination of codewords is: Codeword 1 uses MCS1, Codeword 1 uses MCS2 and Codeword 3 uses MCS3;
  • the combination of codewords is : Codeword 1 uses MCS3, Codeword 2 uses MCS1 and Codeword 3 uses MCS2;
  • the combination of codewords is: Codeword 1 uses MCS2, Codeword 1 uses MCS3 And codeword 3 uses MCS1, and so on. It can be seen that by pre-defining multiple MCSs, different combinations of them are periodically rotated in multiple coding blocks. For different terminals, the combination of different MCSs may be optimal, for example, the optimal combination mode of terminal 1.
  • the performance may be degraded in the second and third TTIs, which sacrifices the receiving performance of some terminals, but it avoids the MSC combination where some terminals are located in the worst receiving performance for a long time. In this way, it better guarantees fairness to different user terminals and different services.
  • the M channel data streams are respectively coded and modulated using the dynamically changed M MCS to obtain M coding blocks.
  • At least one of the M-way data streams carries the broadcast multicast service.
  • the M coded blocks obtained by the coded modulation use the same on the L antennas. Resources are sent in parallel.
  • the "same resource" as used in the embodiments of the present invention includes the same time resource, the same frequency resource, the same code resource, and the like. It is not difficult to find that when the multi-codeword MIM0 is used for transmission, by dynamically changing the MCS corresponding to each coding block, the number of user terminals with poor reception performance of the MBMS service is reduced, and the coverage of the MBMS service is improved.
  • the second embodiment of the present invention also relates to a method for transmitting a broadcast multicast service.
  • the M channels are encoded and modulated by M independent MCSs to obtain M code blocks, where the M channels are used.
  • At least one of the data streams carries the broadcast multicast service, and M>1; the M coded blocks are mapped to the L antennas for parallel transmission by dynamic antenna mapping, wherein the L antennas are transmitted in parallel using the same resources, JL L > in order to avoid receiving M 0 different codewords of different SNR, the SNR can be made equivalent as far as possible by the same resource scheduling.
  • the channel Due to the influence of wireless channel multipath and terminal mobility, the channel has frequency selectivity and time selectivity, and the channel correlation is inversely proportional to the frequency interval and time interval. Therefore, when time-frequency resource mapping is performed, the time-frequency resources corresponding to different symbols are separated as far as possible.
  • the resource mapping may be generated according to a predefined rule. As shown in FIG.
  • the resource mapping methods of different TTIs may also be different. These resource mapping rules are transmitted to the terminal through control signaling. However, there is another case where the bandwidth or time interval of the MBMS service transmission is limited, or the channel frequency selectivity of the base station to the terminal is not obvious, and the terminal moving speed is slow, so that the averaging code cannot be achieved by the time-frequency resource mapping method. Word signal to noise ratio.
  • the antenna mapping mode is dynamically changed on different resources. Each time the dynamic change is made, different antenna mapping modes are used as a new antenna mapping mode, wherein the antenna mapping mode can take a unitary matrix as a transformation matrix.
  • at least two antenna mapping modes are preset, and predetermined rules are used in these mapping modes.
  • Select an antenna mapping method different from the current antenna mapping method as The new antenna mapping method t can be understood that the antenna mapping method uses a unitary matrix as a transformation matrix, and the influence of the transformation matrix can be easily eliminated by multiplying the inverse matrix of the unitary matrix at the time of reception, thereby facilitating processing at the receiving end.
  • Different transformation matrices can be generated by different permutation methods, such as: S ⁇ U ,
  • DFT Discrete Fourier Transformation
  • dynamically changing the antenna mapping matrix can be performed in the time domain. For example, each OF ⁇ symbol changes the mapping matrix once. For example, in the first OFDM symbol, the matrix / ⁇ is used as the mapping matrix, then the matrix is used as the mapping matrix in the second OFDM symbol, the matrix ⁇ 3 is used as the mapping matrix in the third OFDM symbol, and so on.
  • the subcarriers change the mapping matrix once. For example, suppose the number of transmit antennas is 2, and the symbols of the two codewords are respectively; ⁇ ( , ⁇ , , ⁇ ) and ⁇ , ⁇ , ⁇ ), and the codewords are transmitted on subcarriers / ⁇ , ⁇ , ,, And displacement moment
  • the array uses and, then the subcarrier y; the permutation matrix subcarrier / 2 ⁇
  • the antenna mapping matrix can be dynamically changed simultaneously in the time domain and the frequency domain. It can be seen that because there are many ways to dynamically change the antenna mapping matrix, the manufacturer can The application environment selects the most suitable solution, which increases the flexibility of implementation.
  • the M data streams are encoded and modulated by M independent MCSs to obtain M code blocks, wherein at least one data stream in the M data stream carries the MBMS service, M>1.
  • the M coding blocks are mapped to the L antennas by using the antenna mapping method determined in step 910, and are transmitted in parallel using the same resources.
  • the dynamic change of the antenna mapping matrix is equivalent to the dynamic change of the channel matrix in effect, even if the resource bandwidth or time interval of the MBMS service transmission is limited, or the channel frequency selectivity of the base station to the terminal is not obvious, or the user terminal moves speed.
  • the purpose of averaging the code word-to-noise ratio is achieved by dynamically changing the antenna mapping matrix, thereby avoiding the situation that some user terminals have poor reception performance for MBMS services for a long time.
  • the antenna mapping matrix may be dynamically changed for the same system, sometimes the MCS corresponding to each codeword is changed, or the antenna mapping matrix and the corresponding codewords are dynamically changed at the same time. MCS.
  • the change period and the change mode need to be defined in advance, so that the base station can notify the terminal through control signaling to facilitate the reception of the terminal.
  • a third embodiment of the present invention relates to a broadcast multicast service transmitting device, as shown in FIG.
  • the MCS adjusting unit 101 is configured to dynamically change the MCS corresponding to the M coding blocks over time, where M>1, L
  • the code modulation unit 102 is configured to perform code modulation on the M channel data streams according to the M MCSs determined by the MCS adjustment unit 101, where at least one of the M channels of data streams carries the broadcast multicast service.
  • the code modulation unit 102 performs a change on the MCS corresponding to the M coding blocks every N transmission time intervals, Medium N is a positive integer.
  • the MCS adjustment unit 101 may rotate different combinations of the predefined M MCSs on the M coding blocks according to a predetermined rule. By pre-defining a plurality of MCSs, different combinations of them are periodically rotated on a plurality of coding blocks, which can better ensure fairness for different user terminals and different services.
  • a transmitting unit 103 configured to use the M coding blocks output by the coding and modulating unit 102 on the L antennas
  • the multi-codeword MIM0 When the multi-codeword MIM0 is used for transmission, by dynamically changing the MCS corresponding to each coding block, the number of user terminals with poor reception performance of the MBMS service is reduced, the coverage of the MBMS service is improved, and some user terminals are avoided for a long time.
  • the MCS combination method with the worst reception performance When the multi-codeword MIM0 is used for transmission, by dynamically changing the MCS corresponding to each coding block, the number of user terminals with poor reception performance of the MBMS service is reduced, the coverage of the MBMS service is improved, and some user terminals are avoided for a long time.
  • the MCS combination method with the worst reception performance When the multi-codeword MIM0 is used for transmission, by dynamically changing the MCS corresponding to each coding block, the number of user terminals with poor reception performance of the MBMS service is reduced, the coverage of the MBMS service is improved, and some user terminals are avoided for a long time.
  • each unit in this embodiment is a logical unit.
  • the code modulation unit 102 may be composed of M modules, and each module processes one data stream.
  • the fourth embodiment of the present invention also relates to a broadcast multicast service sending device. As shown in FIG. 11, the method includes:
  • the code modulation unit 111 is configured to code and modulate the M channel data stream according to the M independent MCSs, wherein at least one data stream in the M channel data stream carries the MBMS service, M>1, L>M;
  • An antenna mapping adjustment unit 1 12 is configured to dynamically change an antenna mapping manner
  • the antenna mapping unit 11 3 the signal obtained from the M coding blocks is processed by the antenna mapping method determined by the antenna mapping adjustment unit 112 to obtain a transmission vector;
  • the transmitting unit 114 is configured to send the transmission vectors output by the antenna mapping unit 113 through the same resources in parallel through the L antennas, wherein the antenna mapping adjusting unit 112 dynamically changes the antenna mapping manner on different resources.
  • the multi-codeword MIM0 When the multi-codeword MIM0 is used for transmission, by dynamically changing the antenna mapping mode, the number of user terminals with poor reception performance of the MBMS service is reduced, the coverage of the MBMS service is improved, and the SNR of the codeword is averaged. So as to avoid the long-term poor reception performance of some user terminals for MBMS services. Case.
  • each unit in the present embodiment is a logical unit, and various practical physical implementations are possible in practical applications.
  • a fifth embodiment of the present invention relates to a broadcast multicast service transmission system, which is substantially an MBMS single frequency network, and includes K broadcast multicast service transmission devices as described in Embodiment 3, wherein 1.
  • a broadcast multicast service transmitting device transmits the same signal using the same resource.
  • the sixth embodiment of the present invention also relates to a broadcast multicast service sending system, which is substantially an MBMS single frequency network, including X broadcast multicast service sending devices as described in Embodiment 4, wherein > 1 , X broadcast multicast service sending devices use the same resources to send the same signal.
  • a broadcast multicast service sending system which is substantially an MBMS single frequency network, including X broadcast multicast service sending devices as described in Embodiment 4, wherein > 1 , X broadcast multicast service sending devices use the same resources to send the same signal.
  • MCSs are pre-defined, and different combinations of them are periodically rotated on multiple coding blocks, which can better guarantee the fairness of different user terminals and different services.
  • the multi-codeword MIM0 When the multi-codeword MIM0 is used for transmission, by dynamically changing the antenna mapping matrix, the number of user terminals with poor reception performance of the MBMS service is reduced, and the coverage of the MBMS service is improved.
  • the dynamic change of the antenna mapping matrix is equivalent to the dynamic change of the channel matrix in effect, even if the resource bandwidth or time interval of the MBMS service transmission is limited, or the channel frequency selectivity of the base station to the terminal is not obvious, or the user terminal moves slowly,
  • the purpose of averaging the codeword signal-to-noise ratio is achieved by dynamically changing the antenna mapping matrix, thereby avoiding the situation that some user terminals have poor reception performance for the MBMS service for a long time.
  • the antenna mapping matrix can be dynamically changed in the time domain, or the antenna mapping matrix can be dynamically changed in the frequency domain, and the antenna mapping matrix can be dynamically changed in both the time domain and the frequency domain.
  • Multiple implementations enable vendors to The flexibility of implementation is increased by selecting the most appropriate solution for the specific application environment.
  • the influence of the antenna mapping matrix can be easily eliminated by multiplying the inverse matrix of the unitary matrix at the time of reception, which facilitates the processing at the receiving end.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé, un dispositif et un système de transmission de services de difffusion/multidiffusion multimédia (MBMS). Le pourcentage de couverture pour un service MBMS se trouve amélioré en cas de modification dynamique de l'ensemble de mappage d'antennes ou de MCS (Modulation and Coding Scheme/Plan de modulation et de codage) correspondant à chaque mot de code lors de l'adoption de la transmission MIMO de mots de code multiples. L'ensemble de mappage des antennes peut être modifié dynamiquement dans le domaine temps ou dans le domaine fréquence, chacun à leur tour ou simultanément.
PCT/CN2008/071519 2007-07-04 2008-07-02 Procédé, dispositif et système de transmission de services de diffusion/multidiffusion multimédia WO2009003415A1 (fr)

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CN2007100434180A CN101340609B (zh) 2007-07-04 2007-07-04 广播多播业务发送方法、设备及系统
CN200710043418.0 2007-07-04

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CN101931880A (zh) 2009-06-19 2010-12-29 中兴通讯股份有限公司 一种多媒体广播组播业务动态复用的资源分配方法
CN102186147A (zh) * 2011-05-16 2011-09-14 大唐移动通信设备有限公司 一种mbms数据流传输方法和基站及ue
CN112153514B (zh) * 2020-09-24 2022-10-28 恒玄科技(上海)股份有限公司 用于无线通信的无线对耳耳机、无线通信方法和介质

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