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WO2010099750A1 - Procédé de transmission d'éléments de fichier de service de diffusion multimédia individuelle/multiple (mbms), système de transmission et serveur de services - Google Patents

Procédé de transmission d'éléments de fichier de service de diffusion multimédia individuelle/multiple (mbms), système de transmission et serveur de services 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)
Chinese (zh)
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
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 China Mobile Communications Corp filed Critical China Mobile Communications Corp
Publication of WO2010099750A1 publication Critical patent/WO2010099750A1/fr
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)

Abstract

L'invention concerne un procédé de transmission d'éléments de fichier de services de diffusion multimédia individuelle/multiple (MBMS) et un serveur de services MBMS. Selon l'invention, une plate-forme MBMS reçoit des informations d'éléments de fichier d'erreur de terminaux multiples ; la plate-forme MBMS regroupe les terminaux multiples selon les informations reçues des éléments de fichier d'erreur, chaque terminal dans un groupe a au moins un élément de fichier d'erreur identique, et l'élément de fichier d'erreur identique est considéré comme un élément de fichier d'erreur commun ; selon les cellules dans lesquelles les terminaux d'un groupe sont situés, la plate-forme MBMS détermine la zone de retransmission et de diffusion correspondante du groupe ; la plate-forme MBMS diffuse respectivement les éléments de fichier d'erreur communs correspondant aux terminaux dans chaque zone de retransmission et de diffusion aux terminaux dans chaque zone de retransmission et de diffusion. Avec la présente invention, le temps de retransmission et de réparation des éléments de fichier est réduit sans augmenter de manière évidente la ressource de diffusion individuelle.
PCT/CN2010/070864 2009-03-05 2010-03-04 Procédé de transmission d'éléments de fichier de service de diffusion multimédia individuelle/multiple (mbms), système de transmission et serveur de services Ceased WO2010099750A1 (fr)

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Application Number Priority Date Filing Date Title
CN200910079314A CN101827308B (zh) 2009-03-05 2009-03-05 Mbms文件片的发送方法、传输系统及业务服务器
CN200910079314.4 2009-03-05

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CN102984664B (zh) * 2011-09-05 2015-07-22 普天信息技术研究院有限公司 一种控制终端的方法
US10095575B2 (en) * 2012-07-27 2018-10-09 Telefonaktiebolaget Lm Ericsson (Publ) User equipment node, server node and methods performed in such nodes for performing file repair procedure

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CN1910847A (zh) * 2004-01-09 2007-02-07 Lg电子株式会社 Mbms服务的数据错误的修复
CN1957554A (zh) * 2004-03-29 2007-05-02 诺基亚公司 用于多播/广播数据分布的数据修复增强
WO2007069959A1 (fr) * 2005-12-16 2007-06-21 Telefonaktiebolaget Lm Ericsson (Publ) Procede et agencement pour ameliorer la retransmission dans un systeme de communication sans fil

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CN101001162A (zh) * 2006-08-23 2007-07-18 华为技术有限公司 一种生成文件修复请求消息的方法及客户端

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Publication number Priority date Publication date Assignee Title
CN1910847A (zh) * 2004-01-09 2007-02-07 Lg电子株式会社 Mbms服务的数据错误的修复
CN1957554A (zh) * 2004-03-29 2007-05-02 诺基亚公司 用于多播/广播数据分布的数据修复增强
WO2007069959A1 (fr) * 2005-12-16 2007-06-21 Telefonaktiebolaget Lm Ericsson (Publ) Procede et agencement pour ameliorer la retransmission dans un systeme de communication sans fil

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