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Data packet transmission method for multimedia broadcasting service

A technology of multimedia broadcasting and transmission method, applied in the field of data packet transmission, can solve the problems of system misunderstanding, unable to know the end position of PDU, unable to restore SDU synchronization, etc., to achieve the effect of ensuring synchronization

Inactive Publication Date: 2009-02-18
ZTE CORP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the first way, when a lost SDU is carried by two different PDUs, the system cannot know the end position of the segment in the PDU that carries the end segment of this SDU, so the start position of the next SDU cannot be known either. Will not be able to restore synchronicity of transmitted SDUs
In the second method, although LI only gives the position of the end segment, because the length of some SDUs is greater than the length of data carried by a PDU; at this time, there will often be an intermediate segment carried by a PDU; at this time, because there is no The start and end information of this segment
It will cause an error in reading the SDU data in this PDU, and the system will mistakenly think that the actual byte of this segment is the LI indicator
[0004] Aiming at the problem that the above processing method for SDU data packet recovery cannot really realize the recovery of data packets, it is necessary to provide a PDU package SDU format and a recovery method for SDU data packets to solve the problems in the prior art

Method used

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  • Data packet transmission method for multimedia broadcasting service
  • Data packet transmission method for multimedia broadcasting service
  • Data packet transmission method for multimedia broadcasting service

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] When encapsulating SDUs (service data units or service data packets) during data transmission, each SDU ends a segment, and the length indicator (LI) of the segment is given in the PDU data packet.

[0025] figure 1 A PDU encapsulation format is given, the first LI A gives the length of the first SDU A segment (end segment), and the second LI B gives the segment length of the second SDU B . figure 2 Given the case of a PDU packet with only one SDU segment, if the segment is not the end segment, the LI of the segment still needs to be given in the PDU header during encapsulation, but the LI value is used to indicate its Be the first segment (beginning segment) or the middle segment. It can be specified by a specified flag bit in LI, or specified by a combination of field values ​​in LI (for example, a default value that is n...

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Abstract

The invention discloses a method for transmitting data package in multimedia broadcast service so that system can recover content according to data package loss, in order to ensure synchronicity of received content. The transmitting method comprises: when packaging service data unit (SDU), according to ending segment of each SDU, carrying length indicator LI of ending segment of the SDU in package data unit (PDU) head, for indicating length of the SDU ending segment; when receiving the PDU, reading SDU data according to LI in the PDU package head, when the LI in the PDU head is used for indicating length of the SDU ending segment, determining starting position of the next SDU starting segment after the SDU ending segment in the same PDU according to length of the LI.

Description

technical field [0001] The invention relates to a single frequency network-based multimedia broadcasting data technology in the field of mobile communication, in particular to a method for transmitting data packets in a wireless link layer. Background technique [0002] The single frequency network multimedia data broadcasting service is an important direction for the development of the mobile multimedia broadcasting service. Compared with the previous multimedia broadcasting services, the single frequency network multimedia data broadcasting service can provide higher-speed multimedia broadcasting services. The single frequency network multimedia data broadcast sends the content of the same multimedia data broadcast from different base stations at the same time with the same signal from the unified single frequency network multimedia broadcast service area; the terminal combines the received multimedia broadcast data to obtain multimedia broadcast services . In the single...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/22H04L12/56H04L12/18
Inventor 马伟
Owner ZTE CORP
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