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WO2010099750A1 - Mbms文件片的发送方法、传输系统及业务服务器 - Google Patents

Mbms文件片的发送方法、传输系统及业务服务器 Download PDF

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Publication number
WO2010099750A1
WO2010099750A1 PCT/CN2010/070864 CN2010070864W WO2010099750A1 WO 2010099750 A1 WO2010099750 A1 WO 2010099750A1 CN 2010070864 W CN2010070864 W CN 2010070864W WO 2010099750 A1 WO2010099750 A1 WO 2010099750A1
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WO
WIPO (PCT)
Prior art keywords
terminal
file
cell
error file
mbms
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2010/070864
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English (en)
French (fr)
Inventor
卢山
常辉
陈心昕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Mobile Communications Group Co Ltd
Original Assignee
China Mobile Communications Corp
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Filing date
Publication date
Application filed by China Mobile Communications Corp filed Critical China Mobile Communications Corp
Publication of WO2010099750A1 publication Critical patent/WO2010099750A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1863—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
    • H04L12/1868—Measures taken after transmission, e.g. acknowledgments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H04L51/58—Message adaptation for wireless communication

Definitions

  • the present invention relates to a data transmission technology in the field of communications, and in particular, to a method, a transmission system, and a service server for transmitting a multimedia broadcast multicast service file. Background technique
  • the downlink communication services can be divided into two categories, one is Unicast service and the other is multimedia broadcast multicast service (MBMS). , Multimedia Broadcast Multicast Service ).
  • a unicast service is a service in which a data source sends data to a user terminal point-to-point.
  • the MBMS service is a service in which a data source transmits data to multiple user terminals point-to-multipoint.
  • MBMS services can share network resources and provide as many services as possible to user terminals with the same needs with as few resources as possible.
  • the MBMS file transmitted by the MBMS service is composed of at least one source block, and each source block is composed of a number of source symbols (Source Symbol).
  • An MBMS file can be uniquely identified by a Uniform Resource Identifier (URI); each source block in an MBMS file can be uniquely identified by a Source Block Number (SBN); each source symbol in a source block can be encoded
  • URI Uniform Resource Identifier
  • SBN Source Block Number
  • ESI symbol
  • MBMS files may be lost or damaged due to channel fading or other reasons. Therefore, the downloaded MBMS file needs to be repaired.
  • the first repair method is broadcast file repair: After receiving the MBMS file, the terminal checks the file and uses a triple of URI, SBN, and ESI to record the specific file in which the error occurred. Then, the MBMS platform will re-broadcast the complete MBMS file to all the terminals, and the terminal extracts the recorded file of the error from the re-received MBMS file, and uses the re-received file to face the file that originally failed. Make a repair.
  • the second repair method is single-wave file repair: After receiving the MBMS file, the terminal checks the file, and uses a triplet composed of URI, SBN, and ESI to record a specific file that has an error, and uses the triplet information as A modified domain addition is sent to the MBMS platform in a file repair request. After receiving the file repair request, the MBMS platform sends the requested file fragment corresponding to the triplet to the terminal through a point-to-point single-wave mode, and the terminal uses the received file slice to repair the specific file in which the error occurred.
  • the MBMS platform When using the first broadcast file repair method, the MBMS platform needs to broadcast the MBMS file multiple times, which reduces the resource utilization of the MBMS service. In the case of a large broadcast MBMS file, repeated broadcasts take a long time, possibly Will affect the subsequent broadcast content delivery;
  • the MBMS platform When using the second single-wave file repair, the MBMS platform needs to establish a peer-to-peer unicast channel with a terminal that sends a file repair request, in the case that a large number of terminals need to perform file repair. This method will occupy more unicast data resources and affect the service shield of other services. Summary of the invention
  • the embodiment of the invention provides a method for transmitting a multimedia broadcast multicast service file, a transmission system for an MBMS file slice, and an MBMS service server, which are reduced without adding unicast resources.
  • the retransmission time of the file and the repair time of the file are reduced.
  • a method for transmitting an MBMS file comprising:
  • the MBMS platform receives error file information of multiple terminals
  • the MBMS platform groups the plurality of terminals according to the received error file slice information, and each terminal in each group has at least one identical error document slice, and the same error file slice is used as a common error file slice;
  • the MBMS platform determines the retransmission broadcast area corresponding to the group according to the cell in which the terminal is located in each group; the MBMS platform broadcasts the common error file piece corresponding to each terminal in the retransmission broadcast area to the terminal in each retransmission broadcast area.
  • An MBMS service server includes:
  • An information receiving module configured to receive error file information of multiple terminals
  • a grouping module configured to group the plurality of terminals according to the received error file piece information, where: each terminal in each group has at least one identical error file piece, and the same error file piece is used as a common error file.
  • An area determining module configured to determine, according to a cell where the terminal is located in each group, a retransmission broadcast area corresponding to the group;
  • the first file slice sending module is configured to separately broadcast a common error file slice corresponding to each terminal in the retransmission broadcast area to the terminal in each retransmission broadcast area.
  • a transmission system for MBMS file slices comprising a plurality of terminals and an MBMS service server, wherein:
  • the MBMS service server is configured to group the multiple terminals according to the received error file slice information of the multiple terminals, and each terminal in each group has at least one identical error file slice, according to the cell where the terminal in each group is located. Determining a retransmission broadcast area corresponding to the group, and respectively broadcasting, to each terminal in each retransmission broadcast area, a common error file piece corresponding to each terminal in the retransmission broadcast area, the same error file piece being used as a common error file piece ;
  • the terminal is configured to repair the saved error file fragment by using the common error file slice broadcasted by the received MBMS service server.
  • the embodiment of the present invention divides the entire broadcast area into a plurality of retransmission broadcast areas according to the geographical location of the cell, and repairs the common error file corresponding to the terminal in the retransmission broadcast area in multiple retransmission broadcast areas in parallel.
  • the film which reduces the retransmission time of the file and the repair time of the file, provides a better feeling of business use.
  • Figure 1 is a schematic diagram of cutting an MBMS file into a source block and a source symbol
  • FIG. 2 is a schematic diagram of steps of a method in Embodiment 1 of the present invention.
  • Embodiment 3 is a flow chart of steps of a method in Embodiment 2 of the present invention.
  • Figure 4 is a schematic structural diagram of a file repair request using a unicast file repair scheme in the prior art
  • FIG. 4(b) is a schematic structural diagram of a file repair request reported to the MBMS platform in the second embodiment
  • FIG. 5 is a schematic diagram of a location of a home gateway and a cell in the second embodiment
  • FIG. 6 is a schematic structural diagram of an MBMS service server according to Embodiment 3 of the present invention.
  • FIG. 7 is a schematic structural diagram of a transmission system of an MBMS file slice according to Embodiment 4 of the present invention. detailed description
  • the MBMS platform after receiving the file repair request sent by the terminal, divides the coverage area of the MBMS platform into multiple retransmission broadcast areas according to the location information of the cell where the terminal is located and the repair error file slice information requested by the terminal.
  • the terminals belonging to the same retransmission broadcast area have the same common error file.
  • the MBMS platform can broadcast a common error file corresponding to the terminal in the area to a retransmission broadcast area, due to the number of erroneous files. It is smaller than the number of entire MBMS file slices, and therefore, with the solution of the present invention, the broadcast time of the file slice and the repair time of the file slice by the terminal can be reduced.
  • the document slice involved in the embodiment of the present invention may be the source symbol shown in FIG. 1.
  • Embodiment 1 includes the following steps:
  • Step 101 The MBMS platform groups the multiple terminals according to the received error file slice information from multiple terminals, and each terminal in each group has at least one identical error file slice, which may be set in the present invention.
  • the wrong file slice is used as a common error file.
  • the terminal after determining that the file fragment received by the terminal is in error, the terminal reports the file repair request including the triplet information of the error file to the MBMS platform, considering the processing capability of each terminal and the request for reporting.
  • the channel conditions are different.
  • the time at which the terminal in the coverage area of the MBMS platform reports the file repair request is different. Therefore, the MBMS platform needs to wait for a period of time to receive the file repair request of each terminal before resending the repaired file.
  • the limiting condition for grouping the terminal may also be: the cell where the terminal in each group is located is adjacent to at least one cell in the cell where other terminals in the group are located.
  • the inter-cell locations in which the terminals belonging to the same group are located may be adjacent or relatively close, so that the retransmission broadcast area is geographically divided.
  • Step 102 MBMS platform • Determine the retransmission broadcast area corresponding to the group according to the cell where the terminal is located in each group.
  • the area formed by the cell where each terminal in the group is located is the retransmission broadcast area corresponding to the group.
  • the MBMS platform can determine the location of the cell in which the terminal is located. For example, the terminal can report the file repair request containing the error file information, and the file repair request carries the cell identifier of the terminal itself. The MBMS platform determines the location information of the cell where the terminal is located according to the identifier of the cell where the terminal is located; or the terminal carries the identity of the terminal when reporting the error file information, and the MBMS platform determines the cell to which the terminal belongs according to the correspondence between the terminal and the cell to which the terminal belongs. Location information.
  • Step 103 The MBMS platform separately broadcasts a common error file corresponding to each terminal in the retransmission broadcast area to each retransmission broadcast area.
  • the terminal in the broadcast area can repair the common error file that was received last time.
  • the terminal belonging to the same retransmission broadcast area has a personality error file in addition to the common error file, and the personality file is in the error file corresponding to the terminal, except for the common file. Other error file fragments outside.
  • Step 104 The MBMS platform detects the unicast resource usage of the cell where the terminal is located. If the detection result is that the unicast resource of the cell is sufficient (that is, the unicast resource of the cell meets the set condition), step 105 is performed; if the detection result is If the unicast resource of the cell is lacking (that is, the unicast resource of the cell does not satisfy the set condition), step 106 is performed.
  • a unicast resource is a resource for providing a user with a point-to-point voice call or a data service (online service) from a base station to a mobile terminal in a cell.
  • a unicast resource can only be occupied by one user at a time.
  • the unicast resource of the cell does not satisfy the set condition; otherwise, The unicast resources of the cell satisfy the set conditions.
  • Step 105 The MBMS platform propagates the personality error file corresponding to the terminal to the terminal in the cell with sufficient unicast resources.
  • the unicast resources of the cell are sufficient, even if the unicast channel is occupied by using point-to-point propagation, it will not affect other services.
  • the terminal After the terminal receives the personality error file by means of peer-to-peer propagation, the original error file can be repaired.
  • Step 106 The MBMS platform determines a personality error file slice of each terminal belonging to the same cell, and broadcasts a personality error file slice corresponding to each terminal to each terminal in the cell.
  • the MBMS platform broadcasts a personality error file corresponding to each terminal to each terminal in the cell, and after receiving the broadcast personality error file, the terminal receives the broadcast error file. Select your own corresponding personality error file and fix the original personality error file.
  • the step 104 to the step 106 may be performed after the step 103, or may be performed at any time after the step 101.
  • the terminal involved in the embodiment of the present invention can accurately determine the cell where the terminal is located only when the mobile speed is slow. Otherwise, if the terminal reports the file repair request on the A cell, it carries the identifier of the A cell, but in the MBMS. When the common error file is broadcast, the terminal moves to the B cell, and the A and B cells are not the same cell of the retransmission broadcast area, which may cause the solution of the first embodiment to be incorrectly implemented. Therefore, the terminal involved in the embodiments of the present invention may be a mobile terminal such as a mobile phone having a slow moving speed (the moving speed is lower than a set threshold) or in a quasi-stationary state, or may be a home gateway.
  • the terminal in the second embodiment of the present invention is a home gateway. Since most of the third generation mobile communication home gateways supporting MBMS are fixedly deployed in the user's home, most of the cases are in a static state, and therefore, the present invention can be satisfied to move the terminal. Speed requirements.
  • Step 201 The MBMS file performs fragmentation processing on the MBMS file, and then performs the first MBMS file in all the covered cells for MBMS. broadcast.
  • Step 202 After receiving the broadcast of the MBMS file, all the files are checked by the home gateway. If the result of the check is that there is a file segment that receives the error, step 203 is performed; otherwise, the received file piece is assembled. , save and apply.
  • Step 203 The home gateway records the wrong file piece.
  • the wrong piece of document can be recorded based on the triplet information.
  • Step 204 The home gateway carries the identity of the cell in which it is located and the ternary information of the erroneous file slice recorded in the file repair request, and reports it to the MBMS platform.
  • the structure of the file repair request for the MBMS platform is provided, and there are n triples of the file slice to be repaired.
  • Information as shown in Figure 4 (b), the structure of the file repair request reported to the MBMS platform in this step, except
  • the identifier (CellJD) of the cell in which the home gateway is located is added as a field to the file repair request.
  • the home gateway itself does not distinguish between the common error file and the error file in the error file, but in the actual BMS file transmission process, the MBMS platform broadcasts the file to the neighboring cell at the same time due to the interference of the wireless channel.
  • the broadcast transmission affects, so that the home gateway in the neighboring cell loses or damages the same file when receiving the MBMS file, that is, multiple home gateways in a certain geographical area have common error files.
  • each home gateway also generates a personality error file due to different individual factors.
  • the MBMS platform receives an error file from multiple home gateway records, it can divide the error file of one home gateway into a common error file and a personality error file.
  • Step 205 The MBMS platform divides the home gateways with common error files into one group.
  • the 12 home gateways labeled 1 to 12 are respectively located in 6 cells labeled A to F. It is assumed that the common error file of the home gateway and the home gateway 6 is the file slice 1 and the file slice 2
  • the common error file of the home gateway 7 to the home gateway 10 is the file slice 2 and the file slice 3.
  • the error file slices of the home gateway 11 and the home gateway 12 are the file slice 1, the file slice 2, and the file slice 4.
  • the common error file of the home gateway 11 and the home gateway 12 and the home gateway 1 is the file slice 1 and the file slice 2
  • the common error file slice with the home gateway 7 is the file slice 2, which is owned by the home gateway in the same group.
  • the home gateway 11 and the home gateway 12 should be divided into the same group as the home gateway 1 to the home gateway 6; the error file pieces of the home gateway 11 and the home gateway 12 are files.
  • the slice 1, the file slice 2, and the file slice 3, that is, the home gateway 11 has the same number of common error file slices as the home gateway 1 and the home gateway 7, respectively, and the home gateway 11 and the home can be arranged according to the principle of the neighboring cell location.
  • the gateway 12 should be divided into the same group as the home gateway 7 to the home gateway 10.
  • Step 206 The MBMS platform uses the set of cells in which the home gateway in the same group is located as the retransmission broadcast area of the group.
  • the retransmission broadcast area may be a continuous area geographically or a discrete area.
  • the area covered by the cell A, the cell B, the cell C, and the cell F may be used as one.
  • the retransmission broadcast area is composed of two discrete parts, one part is composed of the cell A, the cell B and the cell C coverage area, and the other part is the area covered by the cell F.
  • Step 207 The MBMS platform broadcasts a common error file of the corresponding home gateway in the group to the retransmission broadcast area.
  • the MBMS platform broadcasts the file slice 1 and the file slice 2 to the area covered by the cell A, the cell B, the cell C, and the cell F shown in FIG.
  • Step 208 The home gateway receives the common error file sent by the MBMS platform, and repairs the first received error file.
  • Step 209 The MBMS platform detects the unicast resource usage of the cell where the home gateway is located.
  • Step 210 If the unicast resources in a cell are sufficient, the MBMS platform separately propagates the personality error file of the home gateway to each home gateway in the cell.
  • the MBMS platform establishes a single-point transmission channel with the home gateway 1, and transmits the file 4 to the home gateway 1 point-to-point; the MBMS platform establishes a single-point transmission channel with the home gateway 2, and points to the home gateway 2 Transfer file 5 of the file.
  • Step 211 The home gateway repairs the personality error file according to the received file piece. At this point, the MBMS file slice repair process ends.
  • Step 212 If the unicast resources in a certain cell are lacking, the MBMS platform is in the cell. There is a family error gateway ⁇ ⁇ a home gateway personality error file.
  • the MBMS platform broadcasts the file slice 4 and the file slice 5 to the home gateway 1 and the home gateway 2.
  • Step 213 The home gateway selects its own personality error file from the received file piece of the broadcast, and repairs the file piece.
  • the scheme of the embodiment of the present invention is compared with a conventional broadcast file repair method and a unicast file repair method.
  • the MBMS platform needs to retransmit the 100 files.
  • Each home gateway also receives 100 files and selects the error file that it needs to repair it. The time to retransmit the file is longer, and the time for the home gateway to select and repair is longer.
  • the MBMS platform needs to establish a unicast channel with the 12 home gateways respectively, and the resource occupancy rate is high. If the solution of the embodiment of the present invention is used, the MBMS platform only needs to broadcast two common error files, and according to If the unicast resources of the cell are sufficient, choose the appropriate method to spread the error file.
  • the third embodiment of the present invention further provides an MBMS service server.
  • the MBMS service server includes: an information receiving module 11, a grouping module 12, and an area determination.
  • the first file transmitting module 14 is configured to broadcast a common error file slice corresponding to each terminal in the retransmission broadcast area to the terminal in each retransmission broadcast area.
  • the MBMS service server further includes a resource detecting module 15 and a second file slice sending module 16, wherein: the resource detecting module 15 ffl detects the unicast resource usage of the cell where the terminal is located
  • the second file sending module 16 is configured to: when the unicast resource of the cell meets the setting condition, the terminal sends a personalized error file corresponding to the terminal to the terminal, and when the unicast resource of the cell does not meet the setting condition, Determining a personality error file corresponding to each terminal belonging to the same cell, and broadcasting a personality error file corresponding to each terminal to the terminal in the cell, where: the personality error file is the error file corresponding to the terminal, except Other error file fragments other than the common error file.
  • the information receiving module 11 is further configured to receive the identifier of the cell where the terminal is located; the area determining module 13 is further configured to determine, according to the identifier of the cell where the terminal is located, the cell where the terminal is located, and determine the location according to the cell where the terminal is located in each group. The corresponding retransmission broadcast area of the group.
  • the fourth embodiment of the present invention further provides a transmission system for an MBMS file slice.
  • the system includes a plurality of terminals 21 and an MBMS service server 22, where: the MBMS service server 22 is configured to receive multiple The error file slice information of the terminal groups the plurality of terminals, and each terminal in each group has at least one identical error file slice, and the corresponding retransmission broadcast area of the group is determined according to the cell where the terminal is located in each group, and respectively Broadcasting a common error file corresponding to each terminal in the retransmission broadcast area to the terminal in each retransmission broadcast area, the same error file piece as a common error file piece; each terminal 21 is configured to utilize the received MBMS The common error file slice broadcasted by the service server 22 repairs the saved error file slice.
  • the MBMS service server 22 is further configured to detect the unicast resource usage of the cell where the terminal is located. When the unicast resource of the cell meets the set condition, the unicast resource corresponding to the terminal is propagated to the terminal point-to-point. The resource does not satisfy the setting condition, and the individual error file fragments corresponding to the terminals belonging to the same cell are respectively determined, and the personality error file corresponding to each terminal is broadcast to the terminal in the cell, where: the personality error file piece is the terminal The corresponding error file piece, other error file pieces except the common error file piece; the terminal 21 is further configured to repair the saved error file piece by using the received personality error file piece, and the terminal's personality error file piece is the The terminal has an error file other than the same error file slice as the other terminals in the retransmission broadcast area.
  • the MBMS service server 22 involved in the fourth embodiment may be the MBMS service server in the third embodiment.
  • the entire broadcast area is divided into a plurality of retransmission broadcast areas by using the location information of the cell where the terminal is located, and different common error file fragments are repaired in different retransmission broadcast areas in parallel, and then selected according to the situation.
  • the unicast or broadcast fixes the personality error file of each terminal in the cell.
  • the retransmission time of the file and the repair time of the file are reduced, and the service experience is better, and more files can be transmitted and transmitted reliably in a unit time.
  • the present invention combines the unicast and broadcast modes with the simple unicast method to speed up the file repair speed and reduce the file repair time.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

MBMS文件片的发送方法、 传输系统及业务服务器 本申请要求在 2009年 3月 5日提交中国专利局、申请号为 200910079314.4 发明名称为" MBMS 文件片的发送方法、 传输系统及业务服务器"的中国专利 申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域的数据传输技术， 尤其涉及一种多媒体广播组播业 务文件片的发送方法、 传输系统及业务服务器。 背景技术
在第三代移动通信系统 （TD-CSDMA、 WCMDA, CDMA2000 ) 中， 下 行通信业务可以分为两大类， 一类是单播业务（Unicast service ), 另一类是多 媒体广播组播业务（ MBMS, Multimedia Broadcast Multicast Service )。 单播业 务是一个数据源向一个用户终端点到点地发送数据的业务， MBMS业务是一 个数据源向多个用户终端点到多点地发送数据的业务。 MBMS业务可以实现 网络资源共享， 以尽可能少的资源为尽可能多的有相同需求的用户终端提供 服务。
MBMS业务传输的 MBMS文件由至少一个源块 （Source Block )组成， 每个源块由若干个源符号（ Source Symbol )组成。 一个 MBMS文件可以用统 一资源标识 （URI ) 来唯一标识； MBMS 文件中的每个源块可以用源块编号 ( Source Block Number, SBN )唯一标识； 一个源块中的每个源符号可以用编 码符号 （ESI )唯一标识。
MBMS文件中的第一源块的 SBN为 0,表示为 SBN=0; 第二源块的 SBN 为 1， 表示为 SBN=1 , 以此类推。 同样， 第一源块中的第一个源符号的 ESI 值为 0， 表示为 SBN=0， ESI=0; 第一源块的第二个源符号的 ESI值为 1， 表 示为 SBN=0， ESI-1 , 以此类推。 因此， MBMS文件中的一个编码符号可以 由 URI、 SBN和 ESI组成的三元组唯一标识。 如图 1所示， 一个标识为 URI 的 MBMS文件可以切割为 n个源块，每个源块可以进一步切割为 n个源符号。
在 MBMS文件下发过程中， 由于信道衰落或其他原因可能引起 MBMS 文件片的丢失或者损坏， 因此， 需要对下载后的 MBMS文件进行修复。 现有 的修复方法主要有以下两种：
第一种修复方法是广播式文件修复： 终端接收到 MBMS文件后， 对文件 进行检查， 并利用 URI、 SBN和 ESI组成的三元组纪录发生错误的特定文件 片。 然后， MBMS平台将向所有终端重新广播一遍完整的 MBMS文件， 终端 从再次接收到的 MBMS文件中提取出纪录的发生错误的文件片， 并利用重新 接收到的文件片对原来发生错误的文件片进行修复。
第二种修复方法是单波式文件修复： 终端接收到 MBMS文件后， 对文件 进行检查， 利用 URI、 SBN和 ESI组成的三元组纪录发生错误的特定文件片， 并将三元组信息作为一个修改域添加在文件修复请求中发送给 MBMS平台。 MBMS平台接收到文件修复请求后， 通过点对点的单波方式向终端发送请求 的三元组对应的文件片， 终端利用接收到的文件片修复发生错误的特定文件 片。
使用第一种广播式文件修复方法时， MBMS平台需要多次广播 MBMS文件， 降低了 MBMS业务的资源利用率， 在广播的 MBMS文件较大的情况下， 重复广播 会占用较长的时间， 可能会影响后续广播内容的下发； 使用第二种单波式文 件修复时， MBMS平台需要为与一个发送文件修复请求的终端建立一条点对点 的单播通道， 在大量终端需要进行文件修复的情况下， 这种方式将会占用较 多的单播数据资源， 影响其他业务的服务盾量。 发明内容
本发明实施例提供一种多媒体广播组播业务文件片的发送方法、 MBMS 文件片的传输系统及 MBMS业务服务器， 在不增加单播资源的情况下， 减少 了文件片的重传时间和文件片的修复时间。
一种 MBMS文件片的发送方法， 所述方法包括：
多媒体广播组播业务 MBMS平台接收多个终端的错误文件片信息；
MBMS平台根据接收到的错误文件片信息对所述多个终端进行分组， 每 组中的各终端有至少一个相同的措误文件片， 所述相同的错误文件片作为共 性错误文件片；
MBMS平台根据每组中的终端所在小区确定该组对应的重传广播区域； MBMS平台分别向各重传广播区域内的终端广播该重传广播区域内的各 终端对应的共性错误文件片。
一种 MBMS业务服务器， 所述 MBMS业务服务器包括：
信息接收模块， 用于接收多个终端的错误文件片信息；
分组模块， 用于根据接收到的错误文件片信息对所述多个终端进行分组， 其中： 每组中的各终端有至少一个相同的错误文件片， 所迷相同的错误文件 片作为共性错误文件片；
区域确定模块， 用于根据每组中的终端所在小区确定该组对应的重传广 播区域；
第一文件片发送模块， 用于分别向各重传广播区域内的终端广播该重传 广播区域内的各终端对应的共性错误文件片。
一种 MBMS文件片的传输系统， 所述系统包括多个终端和 MBMS业务 服务器， 其中：
MBMS业务服务器， 用于根据接收到的多个终端的错误文件片信息对所 述多个终端进行分组， 每组中的各终端有至少一个相同的错误文件片， 根据 每组中的终端所在小区确定该组对应的重传广播区域， 并分别向各重传广播 区域内的终端广播该重传广播区域内的各终端对应的共性错误文件片， 所述 相同的错误文件片作为共性错误文件片；
终端，用于利用接收到的 MBMS业务服务器广播的所述共性错误文件片 , 对已保存的错误文件片进行修复。 本发明实施例利用终端所在的小区位置信息将整个广播区域按地理区域 划分成若干个重传广播区域， 并行地在多个重传广播区域内修复该重传广播 区域内终端对应的共性错误文件片， 减少了文件片的重传时间和文件片的修 复时间， 提供了更好的业务使用感受。 附图说明
图 1为 MBMS文件切割为源块和源符号的示意图；
图 2为本发明实施例一中的方法步骤示意图；
图 3为本发明实施例二中的方法步骤流程图；
图 4 ) 为现有技术中采用单播式文件修复方案的文件修复请求的结构 示意图；
图 4 ( b )为本实施例二中上报给 MBMS平台的文件修复请求的结构示意 图；
图 5为本实施例二中家庭网关与小区的位置示意图；
图 6为本发明实施例三中的 MBMS业务服务器结构示意图；
图 7为本发明实施例四中的 MBMS文件片的传输系统结构示意图。 具体实施方式
为了实现本发明目的，在 MBMS平台接收到终端发送的文件修复请求后， 根据终端所在小区的位置信息和终端请求的修复错误文件片信息， 将 MBMS 平台的覆盖区域划分为多个重传广播区域， 属于同一重传广播区域的终端对 应有相同的共性错误文件片， 在此情况下， MBMS平台可以向一个重传广播 区域广播该区域中终端对应的共性错误文件片， 由于错误的文件片数量小于 整个 MBMS文件片的数量， 因此， 利用本发明的方案可以减少文件片的广播 时间和终端对文件片的修复时间。
本发明实施例中涉及的文件片可以为图 1所示的源符号。
下面结合说明书附图对本发明实施例进行详细的描述。 如图 2 所示， 为本发明实施例一中的方法步骤示意图， 实施例一包括以 下步驟：
步骤 101: MBMS 平台根据接收到的来自多个终端的错误文件片信息对 所述多个终端进行分组， 每组中的各终端有至少一个相同的错误文件片， 本 发明中可以设定相同的错误文件片作为共性错误文件片。
在本实施例一中， 终端确定自身接收的文件片发生错误后， 将包含错误 文件片的三元组信息的文件修复请求上报给 MBMS平台， 考虑到各终端的处 理能力不同和上报请求时的信道条件不同， MBMS平台覆盖区域内的终端上 报文件修复请求的时间点不同， 因此， MBMS平台在重新发送修复的文件片 之前， 需要等待一段时间用于接收各终端的文件修复请求。
在本步骤中， 对终端进行分组的限定条件还可以有： 每组中的终端所在 小区与本组中其他终端所在小区中的至少一个小区相邻。 增加这一限定条件 后， 可以限定属于同一组中的终端所在的小区间位置相邻或比较接近， 便于 从地理上划分重传广播区域。
步骤 102: MBMS 平台 ·据每组中的终端所在小区确定该组对应的重传 广播区域。
本步驟可以将组中的每个终端所在小区组成的区域为该组对应的重传广 播区域。
在本步骤中， MBMS平台确定终端所在小区的方式可以有多种， 例如： 可以由终端在上报包含错误文件片信息的文件修复请求的同时， 在文件修复 请求中携带终端自身所在的小区标识， MBMS平台根据终端所在小区的标识 确定终端所在小区的位置信息； 或者， 终端在上报错误文件片信息时携带终 端自身的标识， MBMS平台才艮据终端与所属小区的对应关系， 确定终端所属 的小区的位置信息。
步驟 103: MBMS平台分别向各重传广播区域广播该重传广播区域内的 各终端对应的共性错误文件片。
通过步骤 101至步骤 103 , 完成了一次业务文件片的重传过程， 重传广 播区域内的终端接收到 MBMS平台重传的共性错误文件片后， 可以修复前一 次接收到的发生错误的共性错误文件片。
进一步地， 考虑到属于同一重传广播区域内的终端除了有共性错误文件 片之外， 终端还有个性错误文件片， 所述个性文件片为终端对应的错误文件 片中， 除共性文件片之外的其他错误文件片。
本发明实施例一的方法还可以进一步包括：
步骤 104: MBMS 平台对终端所在小区的单播资源使用情况进行检测， 如果检测结果为小区的单播资源充足（即小区的单播资源满足设定条件）， 则 执行步骤 105; 如果检测结果为小区的单播资源缺乏（即小区的单播资源不满 足设定条件）， 则执行步骤 106。
单播资源是小区内为用户提供基站到移动终端点对点语音通话或者数据 业务（上网业务） 的资源。 单播资源在一个时刻仅能被一个用户所占用。 单 在本实施例中可以设定当该小区单播资源数小于小区内已经修复共性错误后 还有个性错误待修复的移动终端数时， 小区的单播资源不满足设定条件； 反 之， 则小区的单播资源满足设定条件。
步骤 105: MBMS平台向单播资源充足的小区内的终端点对点传播该终 端对应的个性错误文件片。
由于小区的单播资源充足， 因此， 即使使用点对点传播占用了单播通道 也不会影响其他业务。 终端通过点对点传播的方式接收到个性错误文件片后 可以修复原来的错误文件片。
步骤 106: MBMS 平台确定属于同一小区的各终端的个性错误文件片， 并向小区中的各终端广播每个终端对应的个性错误文件片。
由于小区的单播资源缺乏， 使用点对点传播方式会影响其他业务的正常 执行， 因此， MBMS平台向小区内的各终端广播每个终端对应的个性错误文 件， 终端接收到广播的个性错误文件后， 从中选择出自身对应的个性错误文 件， 并修复原来的个性错误文件片。 本实施例一中， 步骤 104至步骤 106可以在步骤 103之后执行， 也可以 在步骤 101之后任意时刻进行。
本发明实施例中涉及的终端只有在移动速度较慢的情况下， MBMS平台 才能够准确地确定终端所在小区， 否则， 假如终端在 A小区上报文件修复请 求时携带 A小区的标识，但在 MBMS广播共性错误文件时终端移动到 B小区， 而 A、 B小区并不是同一重传广播区域的小区，则会导致实施例一的方案无法 正确实现。 因此， 本发明各实施例中涉及的终端可以是移动速度较慢（移动 速度低于已设定门限值） 或处于准静止状态的手机等移动终端， 也可以是家 庭网关。
为了进一步说明本发明实施例一的方案， 本发明实施例二以具体的实例 来对实施例一加以说明。
假设本发明实施例二的终端为家庭网关， 由于支持 MBMS的第三代移动 通信家庭网关大多固定部署于用户的家庭居室内， 绝大多数情况处于静止状 态， 因此， 能够满足本发明对终端移动速度的要求。
如图 3所示， 为本发明实施例二的方案流程图， 包括以下步骤： 步驟 201： MBMS平台对 MBMS文件进行分片处理，然后将完整的 MBMS 文件片在覆盖的所有小区内首次进行 MBMS广播。
步骤 202: 家庭网关在全部接收完 MBMS文件片的广播后， 对每一个文 件片进行检查； 如果检查结果为存在接收错误的文件片， 则执行步骤 203; 否 则， 对接收到的文件片进行组装、 保存并应用。
步骤 203: 家庭网关记录错误的文件片。
错误的文件片可以根据三元组信息记录。
步骤 204:家庭网关将自身所在小区的标识和记录的错误的文件片的三元 组信息携带在文件修复请求中， 并上报给 MBMS平台。
如图 4( a )所示，为现有技术中釆用单播式文件修复方案时上 4艮给 MBMS 平台的文件修复请求的结构， 图中有 n个待修复的文件片的三元组信息； 如 图 4 ( b )所示， 为本步骤中上报给 MBMS平台的文件修复请求的结构， 除了 携带 n 个待修复的文件片的三元组信息外， 还将家庭网关所在小区的标识 ( CellJD )作为一个字段添加到文件修复请求中。
家庭网关自身并不区分错误文件片中的共性错误文件片和个性错误文件 片， 但在实际的 BMS 文件发送过程中， 由于无线信道受到干扰等情况， MBMS平台广播的文件会同时对临近小区的广播传输造成影响， 从而产生临 近小区内的家庭网关在接收 MBMS文件片时， 丢失或者损坏相同的文件片， 也就是在一定的地理区域内的多个家庭网关具有共性错误文件片。 同时， 单 个家庭网关在接收 MBMS文件片时， 由于分别受到不同的个体因素影响， 每 个家庭网关还会产生个性错误文件片。 MBMS平台接收到来自多个家庭网关 记录的错误文件片时， 可以将一个家庭网关的错误文件片划分为共性错误文 件片和个性错误文件片。
步骤 205: MBMS 平台将具有共性错误文件片的家庭网关划分在一个组 内。
进一步地， 可以设置划分在一个组内的家庭网关具有的共性错误文件片 的数量不得少于一个设定值。
如图 5所示， 标号为 1~12的 12个家庭网关分别位于标号为 A~F的 6个 小区内， 假设： 家庭网关卜家庭网关 6的共性错误文件片为文件片 1和文件 片 2， 家庭网关 7〜家庭网关 10的共性错误文件片为文件片 2和文件片 3， 家 庭网关 11和家庭网关 12的错误文件片为文件片 1、 文件片 2和文件片 4。 则 家庭网关 11和家庭网关 12与家庭网关 1的共性错误文件片为文件片 1和文 件片 2, 与家庭网关 7的共性错误文件片为文件片 2, 在 "同一组内的家庭网 关具有的共性错误文件片的数量不得少于 2个" 的情况下， 家庭网关 11和家 庭网关 12应该与家庭网关 1〜家庭网关 6划分在同一组； 家庭网关 11和家庭 网关 12的错误文件片为文件片 1、 文件片 2和文件片 3， 即家庭网关 11分别 与家庭网关 1和家庭网关 7的共性错误文件片的数量相同， 则可以按照所在 小区位置相邻的原则， 将家庭网关 11和家庭网关 12应该与家庭网关 7〜家庭 网关 10划分在同一组。 步驟 206: MBMS平台将同一组内的家庭网关所在小区的集合作为该组 的重传广播区域。
重传广播区域在地理上可以是一个连续的区域， 也可以是一个离散的区 域。 例如， 如杲图 5中的家庭网关 11和家庭网关 12与家庭网关 1〜家庭网关 6是同一组的家庭网关， 则可以将小区 A、 小区 B、 小区 C和小区 F所覆盖的 区域作为一个重传广播区域， 该重传广播区域是包括两个离散的部分， 一部 分是由小区 A、 小区 B和小区 C覆盖区域组成， 另一部分是小区 F所覆盖的 区域。
步骤 207: MBMS 平台向重传广播区域广播对应的组内家庭网关的共性 错误文件片。
MBMS平台向图 5所示的小区 A、 小区 B、 小区 C和小区 F所覆盖的区 域内广播文件片 1和文件片 2。
步骤 208: 家庭网关接收 MBMS平台发送的共性错误文件片， 并修复首 次接收到的错误文件片。
在共性错误文件片得到后， 将继续修复个性错误文件片。
步骤 209: MBMS平台对家庭网关所在小区的单播资源使用情况进行检 测。
步驟 210: 如果某个小区内的单播资源充足， 则 MBMS平台分别对小区 内的每个家庭网关点对点地传播该家庭网关的个性错误文件片。
例如， 图 5中的小区 A中有家庭网关 1和家庭网关 2， 其中： 家庭网关 1 的个性错误文件片为文件片 4, 家庭网关 2的个性错误文件片为文件片 5。 当 小区 A的单播资源充足时， MBMS平台与家庭网关 1建立单点传输通道， 向 家庭网关 1点对点的传输文件片 4; MBMS平台与家庭网关 2建立单点传输 通道， 向家庭网关 2点对点的传输文件片 5。
步骤 211： 家庭网关根据接收到的文件片对个性错误文件片进行修复。 此时， MBMS文件片修复过程结束。
步骤 212: 如杲某个小区内的单播资源缺乏， 则 MBMS平台向小区内所 有家庭网关广 ^^个家庭网关的个性错误文件片。
仍以图 5中的小区 A为例， 当小区 A的单播资源缺乏时， MBMS平台向 家庭网关 1和家庭网关 2广播文件片 4和文件片 5。
步骤 213： 家庭网关从接收到的广播的文件片中， 选择自身的个性错误文 件片， 并进行文件片的修复。
此时， MBMS文件片修复过程结束。
为了直观体现本发明实施例的效果， 将本发明实施例的方案与传统的广 播式文件修复方法和单播式文件修复方法进行比较。
仍以如图 5所示的家庭网关与小区的位置示意图为例 ,假设完整的 MBMS 文件片由 100个文件片组成： 如果采用传统的广播式文件修复方法， MBMS 平台需要重传这 100个文件片， 每个家庭网关也要接收 100个文件片并从中 选择出自身需要的错误文件片进行修复， 重传文件片的时间较长， 家庭网关 进行选择修复的时间也较长； 如果采用传统的单播式文件修复， MBMS平台 需要分别与 12个家庭网关分别建立单播通道， 资源占用率较高； 如果采用本 发明实施例的方案， MBMS平台只需要广播两次共性错误文件片， 并根据小 区单播资源是否充足的情况， 选择合适的方式传播个性错误文件片。
与本发明实施例一属于同一发明构思下的， 本发明实施例三还提供一种 MBMS业务服务器， 如图 6所示， 所述 MBMS业务服务器包括： 信息接收模 块 11、 分组模块 12、 区域确定模块 13和第一文件片发送模块 14, 其中： 信 息接收模块 11用于接收多个终端的错误文件片信息； 分组模块 12用于根据 接收到的错误文件片信息对所述多个终端进行分组， 其中： 每组中的各终端 有至少一个相同的错误文件片， 所述相同的错误文件片作为共性错误文件片； 区域确定模块 13用于根据每组中的终端所在小区确定该组对应的重传广播区 域； 第一文件片发送模块 14用于分别向各重传广播区域内的终端广播该重传 广播区域内的各终端对应的共性错误文件片。
所述 MBMS业务服务器还进一步包括资源检测模块 15和第二文件片发 送模块 16, 其中： 资源检测模块 15 ffl于检测终端所在小区的单播资源使用情 第二文件片发送模块 16 用于于当检测结果为小区的单播资源满足设定条件 时， 向终端点对点传播该终端对应的个性错误文件片， 当小区的单播资源不 满足设定条件时， 分别确定属于同一小区的各终端对应的个性错误文件片， 并向小区中的终端广播每个终端对应的个性错误文件片， 其中： 个性错误文 件片为该终端对应的错误文件片中， 除共性错误文件片以外的其它的错误文 件片。
进一步地， 所述信息接收模块 11还用于接收终端所在小区的标识； 所述 区域确定模块 13还用于根据终端所在小区的标识确定终端所在小区， 并根据 每组中的终端所在小区确定该组对应的重传广播区域。
本发明实施例四还提供一种 MBMS文件片的传输系统， 如图 7所示， 所 述系统包括多个终端 21和 MBMS业务服务器 22, 其中： MBMS业务服务器 22用于根据接收到的多个终端的错误文件片信息对所述多个终端进行分组， 每组中的各终端有至少一个相同的错误文件片 , 根据每组中的终端所在小区 确定该组对应的重传广播区域， 并分别向各重传广播区域内的终端广播该重 传广播区域内的各终端对应的共性错误文件片， 所述相同的错误文件片作为 共性错误文件片； 每个终端 21用于利用接收到的 MBMS业务服务器 22广播 的所述共性错误文件片， 对已保存的错误文件片进行修复。
MBMS业务服务器 22还用于检测终端所在小区的单播资源使用情况， 当 检测结果为小区的单播资源满足设定条件， 向终端点对点传播该终端对应的 个性错误文件片， 当小区的单播资源不满足设定条件， 分别确定属于同一小 区的各终端对应的个性错误文件片， 并向小区中的终端广播每个终端对应的 个性错误文件片， 其中： 所述个性错误文件片为该终端对应的错误文件片， 除共性错误文件片以外的其它的错误文件片； 终端 21还用于利用接收到的个 性错误文件片对已保存的错误文件片进行修复， 终端的个性错误文件片为该 终端与重传广播区域内其他终端相同的错误文件片以外的其它的错误文件 片。 实施例四中涉及的 MBMS业务服务器 22可以是实施例三中的 MBMS业 务服务器。
本发明实施例利用终端所在的小区位置信息将整个广播区域按地理区域 划分成若干个重传广播区域， 并行地在不同的重传广播区域内修复不同的共 性错误文件片， 之后再根据情况选择单播或者广播对小区内各终端的个性错 误文件片进行修复。 相对于传统的广播式文件修复方案， 减少了文件片的重 传时间和文件片的修复时间， 提供了更好的业务使用感受， 在单位时间内可 以可靠广播传送更多的文件片。 相对于单播式文件修复方案， 在丢失活损坏 文件片较多时， 明显提高了资源的占用率， 减少了对单播资源的占用， 为其 他单播业务的使用提供了更好服务盾量。 同时由于本发明结合单播、 广播方 式相对于简单的单播方式加快了文件修复速度， 减少了文件修复时间。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种 MBMS文件片的发送方法， 其特征在于， 所述方法包括： 多媒体广播组播业务 MBMS平台接收多个终端的错误文件片信息； MBMS平台根据接收到的错误文件片信息对所述多个终端进行分组， 每 组中的各终端有至少一个相同的错误文件片， 所述相同的错误文件片作为共 性错误文件片；
MBMS平台根据每组中的终端所在小区确定该组对应的重传广播区域； MBMS平台分别向各重传广播区域内的终端广播该重传广播区域内的各 终端对应的共性错误文件片。
2、如权利要求 1所述的方法， 其特征在于， 确定所述重传广播区域之后， 所述方法还包括：
MBMS平台检测终端所在小区的单播资源使用情况；
如果小区的单播资源满足设定条件， MBMS平台向终端点对点传播该终 端对应的个性错误文件片；
如果小区的单播资源不满足设定条件， MBMS平台分别确定属于同一小 区的各终端对应的个性错误文件片， 并向小区中的终端广播每个终端的对应 个性错误文件片；
所述个性错误文件片为该终端对应的错误文件片中， 除共性错误文件片 以外的其它的错误文件片。
3、 如权利要求 1或 2所述的方法， 其特征在于， 每组中的终端所在小区 与本组中其他终端所在小区中的至少一个小区相邻。
4、 如权利要求 3所述的方法， 其特征在于， 根据组中的终端所在小区确 定重传广播区域包括：
组中的每个终端所在小区组成的区域为该组对应的重传广播区域。
5、 如权利要求 1或 2所述的方法， 其特征在于， MBMS平台接收来自多 个终端的错误文件片信息之前， 所述方法还包括： 终端检查接收到的 MBMS业务文件， 确定 MBMS业务文件中的错误文 件片 , 并将确定的所述错误文件片的信息和终端所在小区的标识通过文件修 复请求上报给 MBMS平台；
则 MBMS平台根据每组中的终端所在小区确定该组对应的重传广播区域 包括：
MBMS平台根据终端所在小区的标识确定终端所在小区， 进而根据终端 所在小区确定该组对应的重传广播区域。
6、一种 MBMS业务服务器，其特征在于，所述 MBMS业务服务器包括： 信息接收模块， 用于接收多个终端的错误文件片信息；
分组模块， 用于根据接收到的错误文件片信息对所述多个终端进行分组， 其中： 每组中的各终端有至少一个相同的错误文件片， 所述相同的错误文件 片作为共性错误文件片；
区域确定模块， 用于根据每组中的终端所在小区确定该组对应的重传广 播区域；
第一文件片发送模块， 用于分别向各重传广播区域内的终端广播该重传 广播区域内的各终端对应的共性错误文件片。
7、 如权利要求 6所述的 MBMS业务服务器， 其特征在于， 所述 MBMS 业务服务器还包括：
资源检测模块， 用于检测终端所在小区的单播资源使用情况；
第二文件片发送模块， 用于当检测结果为小区的单播资源满足设定条件 时， 向终端点对点传播该终端对应的个性错误文件片， 当小区的单播资源不 满足设定条件时， 分别确定属于同一小区的各终端对应的个性错误文件片 , 并向小区中的终端广播每个终端对应的个性错误文件片；
其中： 个性错误文件片为该终端对应的错误文件片中， 除共性错误文件 片以外的其它的错误文件片。
8、 如权利要求 6所述的 MBMS业务服务器， 其特征在于，
所述信息接收模块， 还用于接收终端所在小区的标识； 所述区域确定模块， 还用于根据终端所在小区的标识确定终端所在小区， 并根据每组中的终端所在小区确定该組对应的重传广播区域。
9、 一种 MBMS文件片的传输系统， 其特征在于， 所述系统包括多个终 端和 MBMS业务服务器， 其中：
MBMS业务服务器， 用于根据接收到的多个终端的错误文件片信息对所 述多个终端进行分组， 每组中的各终端有至少一个相同的错误文件片， 根据 每组中的终端所在小区确定该组对应的重传广播区域， 并分别向各重传广播 区域内的终端广播该重传广播区域内的各终端对应的共性错误文件片， 所述 相同的错误文件片作为共性错误文件片；
终端，用于利用接收到的 MBMS业务服务器广播的所述共性错误文件片， 对已保存的错误文件片进行修复。
10、 如权利要求 9所述的 MBMS文件片的传输系统， 其特征在于， MBMS业务服务器， 还用于检测终端所在小区的单播资源使用情况， 当 检测结果为小区的单播资源满足设定条件， 向终端点对点传播该终端对应的 个性错误文件片， 当小区的单播资源不满足设定奈件， 分别确定属于同一小 区的各终端对应的个性错误文件片 , 并向小区中的终端广播每个终端对应的 个性错误文件片；
终端， 还用于利用接收到的个性错误文件片对已保存的错误文件片进行 修复；
其中： 所述个性错误文件片为该终端对应的错误文件片， 除共性错误文 件片以外的其它的错误文件片。
PCT/CN2010/070864 2009-03-05 2010-03-04 Mbms文件片的发送方法、传输系统及业务服务器 Ceased WO2010099750A1 (zh)

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