CN101370165A - Data packet transmission method for multimedia broadcasting service - Google Patents
Data packet transmission method for multimedia broadcasting service Download PDFInfo
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- CN101370165A CN101370165A CNA2007101297000A CN200710129700A CN101370165A CN 101370165 A CN101370165 A CN 101370165A CN A2007101297000 A CNA2007101297000 A CN A2007101297000A CN 200710129700 A CN200710129700 A CN 200710129700A CN 101370165 A CN101370165 A CN 101370165A
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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
The present invention relates to the multimedia broadcast data technology of moving communicating field, refer more particularly to the transmission method of the packet in a kind of radio link layer based on single frequency network.
Background technology
The Single Frequency Network multimedia data broadcast service is an important directions of the multi-media broadcasting service development of moving.Single Frequency Network multimedia data broadcast service multi-media broadcasting service relatively in the past can provide the MBMS service of higher rate.The Single Frequency Network multimedia data broadcast sends the content of same multimedia data broadcast with identical signal at one time from unified Single Frequency Network MBMS service zone from different base stations; The multimedia broadcast data that end-on is received makes up the acquisition MBMS service.In the Single Frequency Network data broadcasting service, data synchronization is very important in the radio link layer.In the propagation that is lost in data of packet and the processing procedure is unavoidable, so we need handle recovery to the datagram of losing.The recovery here is not the content of restore data newspaper, but will confirm quantity of data packets and size, so that generate in the radio link layer buffer that corresponding pseudo-datagram is filled into data; The synchronism of guaranteeing to transmit content is unaffected.
The service data unit of the multi-media broadcasting service in the radio link layer transmits by MAC layer by carrying back, radio link layer packing data unit.The service data unit bag to be lost in that transmission course loses be inevitably, losing of datagram can impact the synchronism of transmission content.For packet is recovered, need know the quantity and the length of lost package.Here the length indicator (LI) that passes through of lost package length provides.At LI dual mode is arranged at present, a kind of is LI designator of a service data unit bag (SDU), and another kind is segmentation (SDU segment) or LI designator of a packing data unit segmentation (PDU segment) of a service data unit.When adopting designator of each segmentation (this moment, the LI designator was placed in the segmentation), because the losing this designator and also can lose of segmentation, so when losing a plurality of data sementation, can't recover the synchronism of service unit bag.When adopting LI designator of each service unit bag two kinds of situations are arranged at present, one is the length that provides whole service unit, provides after the sequence number of the packing data unit pack that service unit bag original position occurs; Another kind is to provide the length of SDU or last segmentation of SDU in the PDU that finishes the segmentation place.First kind of mode, when a SDU who loses is carried by two different PDU, the end position of segmentation among the PDU that carries this SDU end segmentation can't be learnt by system, so the original position of next SDU also can't be known the synchronism of the SDU that can't recover to transmit.Though second method LI has just provided the position of finishing segmentation, because the length of some SDU is greater than the length of PDU carrying data; Often have medial section and carried by a PDU this moment; At this moment owing to there is not the initial and ending message of this segmentation among the PDU.Can cause the SDU data read among this PDU to make a mistake, system can think that the byte in fact of this segmentation is the LI designator by mistake.
Can't really realize the problem of the recovery of packet at the method for above processing to the SDU data packet recovery, the restoration methods that therefore form of a kind of PDU encapsulation SDU and SDU packet need be provided is to solve the problems of the prior art.
Summary of the invention
The technical problem to be solved in the present invention provides the transmission method of packet in a kind of multi-media broadcasting service, and the system that makes can realize content recovery after data-bag lost occurring, guarantee the synchronism of follow-up received content.
In order to solve the problems of the technologies described above, the invention provides the sending method of packet in a kind of multi-media broadcasting service, it is characterized in that, to the data service unit is that SDU is when encapsulating, end segmentation for each SDU, be that to carry the length indicator that this SDU finishes segmentation in the PDU head be LI in the packing data unit, be used to indicate described SDU to finish the length of segmentation.
Further, only have a SDU segmentation in a PDU, and described SDU segmentation is when being beginning segmentation or medial section, the LI that carries in the described PDU head is used to indicate described SDU and is segmented into beginning segmentation or medial section.
Further, the described LI that is used for indicating beginning segmentation or medial section is that specified sign position or designated word segment value by this LI is combined into indicating of row beginning segmentation or medial section.
In order to solve the problems of the technologies described above, the present invention also provides the method for reseptance of packet in a kind of multi-media broadcasting service, it is characterized in that, when receiving the packing data unit when being PDU, according to the length indicator in the pdu header is that LI reading of data service unit is the data of SDU, when the LI in the described PDU head is used to indicate SDU to finish the length of segmentation, then determine that according to the length of described LI SDU described in the same PDU finishes the original position that next SDU begins segmentation after the segmentation.
Further, when the LI in the described PDU head is used to indicate described SDU to be segmented into beginning segmentation or medial section, then represent only to comprise a SDU segmentation among the described PDU, read this SDU segmentation.
Further, at PDU
iIn, after a complete SDU bag reads and finishes,, read nearest one and have the PDU that indication finishes segmentation LI if packet is lost
I+n, according to described PDU
iAnd PDU
I+nSequence number be SN and described PDU
iAnd PDU
I+nThe middle indicated length of LI that finishes segmentation of indicating is determined the length of data package of losing.
The length of data package of losing further, adopts with in the following formula one or several and calculates: the length of the PDU that loses=described PDU
I+nSequence number SN
I+nWith described PDU
iSequence number SN
iBetween difference
*The length of PDU; Described PDU
iIn the length=described PDU of the SDU segmentation of losing
iThe length of data division-described PDU
iIn all read correct SDU and finish the indicated length of the pairing LI of segmentation; Described PDU
I+nIn the length=described PDU of the SDU segmentation of losing
I+nIn the length of first LI indication.
In order to solve the problems of the technologies described above, the present invention also provides the transmission method of packet in a kind of multi-media broadcasting service, it is characterized in that, to the data service unit is that SDU is when encapsulating, end segmentation for each SDU, be that to carry the length indicator that this SDU finishes segmentation in the PDU head be LI in the packing data unit, be used to indicate described SDU to finish the length of segmentation; When receiving described PDU, read the data of SDU according to the LI in the pdu header, when the LI in the described PDU head is used to indicate SDU to finish the length of segmentation, then determine that according to the length of described LI SDU described in the same PDU finishes the original position that next SDU begins segmentation after the segmentation.
Further, when SDU is encapsulated, only have a SDU segmentation in a PDU, and described SDU segmentation is when being beginning segmentation or medial section, the LI that carries in the described PDU head is used to indicate described SDU and is segmented into beginning segmentation or medial section; When receiving described PDU, when the LI in the described PDU head is used to indicate described SDU to be segmented into beginning segmentation or medial section, then represent only to comprise a SDU segmentation among the described PDU, read this SDU segmentation.
Further, at PDU
iIn, after a complete SDU bag reads and finishes,, read nearest one and have the PDU that indication finishes segmentation LI if packet is lost
I+n, according to described PDU
iAnd PDU
I+nSequence number be SN and described PDU
iAnd PDU
I+nThe middle indicated length of LI that finishes segmentation of indicating is determined the length of data package of losing.
The length of data package of losing further, adopts with in the following formula one or several and calculates: the length of the PDU that loses=described PDU
I+nSequence number SN
I+nWith described PDU
iSequence number SN
iBetween difference
*The length of PDU; Described PDU
iIn the length=described PDU of the SDU segmentation of losing
iThe length of data division-described PDU
iIn all read correct SDU and finish the indicated length of the pairing LI of segmentation; Described PDU
I+nIn the length=described PDU of the SDU segmentation of losing
I+nIn the length of first LI indication.
Adopt the method for the invention, the synchronous of follow-up reception guaranteed in the recovery in the time of can guaranteeing data-bag lost.Recovery when being particularly useful for a plurality of data-bag lost.
Description of drawings
The form of Fig. 1 PDU encapsulation SDU;
The content of Fig. 2 PDU encapsulation only is the format description of a SDU segmentation;
The schematic diagram of PDU encapsulation SDU in Fig. 3 actual transmissions;
SDU The initial segment situation schematic diagram of PDU encapsulation in Fig. 4 actual transmissions;
The situation schematic diagram of a SDU interlude of PDU encapsulation in Fig. 5 actual transmissions.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
In transfer of data SDU (service data unit or title service data bag) when encapsulating, is finished segmentation, the length indicator of this segmentation that provides (LI) at each SDU in the PDU packet.
Fig. 1 has provided the encapsulation format of a kind of PDU, and the 1st LI A provided the length of first SDU A segmentation (end segmentation), and the 2nd LI B provided the section length of second SDU B.Fig. 2 has provided the situation of the PDU bag that only has a SDU segmentation, if this segmentation is not to finish segmentation, then still need provide the LI of this segmentation when encapsulation in the PDU head, is first segmentation (beginning segmentation) or medial section but this LI value is used to indicate it.Can indicate by the specified sign position among the LI, perhaps indicate by the combination of the designated word segment value among the LI (default value of for example not using).LI also can provide the length of this segment data packet.
When receiving the PDU packet, system reads each SDU respectively according to the length of LI indication.If comprised two SDU segmentations among the PDU, then should exist a LI to be used to indicate the length of a SDU segmentation at least.Under the encapsulation state of Fig. 3, first LI has indicated the length of the end segmentation of SDU1, like this, play the length that first LI indicates from original position, all be the data of the end segmentation of SDU1, and system can determine the starting position of SDU2 according to first LI, and reads the data of SDU2 according to the LI Length Indication of current SDU2.Fig. 4 provides the situation that PDU has encapsulated an initial segmentation of SDU, and system begins reading of data up to the PDU end position from the position that the LI field finishes, and reads the data that first LI among the next PDU indicates length.Be encapsulated as under the situation of representing among Fig. 5 that has only encapsulated a SDU medial section at next PDU, system continues to read the data among the current PDU, has indicated to finish till the length of segmentation in next PDU.
When not having effective SDU segment data, think that packet is lost or SDU makes mistakes, (PDU that can read last complete S DU bag is called PDU to read the back that finishes at a SDU bag
i), remaining SDU data sementation is lost among the same PDU, and perhaps all or part of of next PDU lost, and then has the PDU (PDU that indication finishes segmentation LI according to nearest one that reads
I+n), determine that the length of data package of losing constructs pseudo-packet and fill.
During the SDU number that need determine to lose, then can determine, because the LI that indication finishes segmentation promptly represents to have a SDU packet according to the number that indication in the PDU head finishes the LI of segmentation.All SDU section length sums during a SDU wraps may be greater than the length of a PDU carrying, if previous PDU only comprises the medial section of this SDU, the SDU length of losing can be extended to previous PDU again; If a back PDU only comprises the medial section of this SDU; Its length can be extended to a back PDU again.But, if carry among the PDU be segmented into the beginning segmentation, this SDU section length=0 in the then previous PDU bag; If what carry among the PDU is segmented into the end segmentation, this SDU section length=0 in the then back PDU bag.
Also might abandon several SDU data simultaneously, all length of data package of then losing can adopt as required with one or several the combination in the following formula and calculate (this paper only considers the situation that PDU length is fixing):
Length=(the SN of the PDU data of losing
I+n-SN
i) * PDU length;
PDU
iIn length=this PDU of the SDU segmentation of losing
iThe length of data division (payload segment of carrying SDU data except the PDU head)-PDU
iIn all read correct SDU and finish the indicated length of the pairing LI of segmentation;
PDU
I+nIn the length=PDU of the SDU segmentation of losing
I+nIn the length of first LI indication.
Calculate after the length, in decode procedure, just can fill the padding data of equal length, thereby play synchronous effect.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (11)
1. the sending method of packet in the multi-media broadcasting service, it is characterized in that, to the data service unit is that SDU is when encapsulating, end segmentation for each SDU, be that to carry the length indicator that this SDU finishes segmentation in the PDU head be LI in the packing data unit, be used to indicate described SDU to finish the length of segmentation.
2. sending method as claimed in claim 1, it is characterized in that, only have a SDU segmentation in a PDU, and described SDU segmentation is when being beginning segmentation or medial section, the LI that carries in the described PDU head is used to indicate described SDU and is segmented into beginning segmentation or medial section.
3. sending method as claimed in claim 2 is characterized in that, the described LI that is used for indicating beginning segmentation or medial section is that specified sign position or the designated word segment value by this LI is combined into indicating of row beginning segmentation or medial section.
4. the method for reseptance of packet in the multi-media broadcasting service, it is characterized in that, when receiving the packing data unit when being PDU, according to the length indicator in the pdu header is that LI reading of data service unit is the data of SDU, when the LI in the described PDU head is used to indicate SDU to finish the length of segmentation, then determine that according to the length of described LI SDU described in the same PDU finishes the original position that next SDU begins segmentation after the segmentation.
5. method of reseptance as claimed in claim 4 is characterized in that, when the LI in the described PDU head is used to indicate described SDU to be segmented into beginning segmentation or medial section, then represents only to comprise a SDU segmentation among the described PDU, reads this SDU segmentation.
6. method of reseptance as claimed in claim 4 is characterized in that, at PDU
iIn, after a complete SDU bag reads and finishes,, read nearest one and have the PDU that indication finishes segmentation LI if packet is lost
I+n, according to described PDU
iAnd PDU
I+nSequence number be SN and described PDU
iAnd PDU
I+nThe middle indicated length of LI that finishes segmentation of indicating is determined the length of data package of losing.
7. method of reseptance as claimed in claim 6 is characterized in that, the length of data package of losing adopts with in the following formula one or several and calculates:
The length of the PDU that loses=described PDU
I+nSequence number SN
I+nWith described PDU
iSequence number SN
iBetween the length of difference * PDU;
Described PDU
iIn the length=described PDU of the SDU segmentation of losing
iThe length of data division-described PDU
iIn all read correct SDU and finish the indicated length of the pairing LI of segmentation;
Described PDU
I+nIn the length=described PDU of the SDU segmentation of losing
I+nIn the length of first LI indication.
8. the transmission method of packet in the multi-media broadcasting service is characterized in that,
To the data service unit is SDU when encapsulating, and for the end segmentation of each SDU, is that to carry the length indicator that this SDU finishes segmentation in the PDU head be LI in the packing data unit, is used to indicate described SDU to finish the length of segmentation;
When receiving described PDU, read the data of SDU according to the LI in the pdu header, when the LI in the described PDU head is used to indicate SDU to finish the length of segmentation, then determine that according to the length of described LI SDU described in the same PDU finishes the original position that next SDU begins segmentation after the segmentation.
9. transmission method as claimed in claim 8 is characterized in that,
When SDU is encapsulated, only have a SDU segmentation in a PDU, and described SDU segmentation is when being beginning segmentation or medial section, the LI that carries in the described PDU head is used to indicate described SDU and is segmented into beginning segmentation or medial section;
When receiving described PDU, when the LI in the described PDU head is used to indicate described SDU to be segmented into beginning segmentation or medial section, then represent only to comprise a SDU segmentation among the described PDU, read this SDU segmentation.
10. transmission method as claimed in claim 8 is characterized in that, at PDU
iIn, after a complete SDU bag reads and finishes,, read nearest one and have the PDU that indication finishes segmentation LI if packet is lost
I+n, according to described PDU
iAnd PDU
I+nSequence number be SN and described PDU
iAnd PDU
I+nThe middle indicated length of LI that finishes segmentation of indicating is determined the length of data package of losing.
11. transmission method as claimed in claim 10 is characterized in that, the length of data package of losing adopts with in the following formula one or several and calculates:
The length of the PDU that loses=described PDU
I+nSequence number SN
I+nWith described PDU
iSequence number SN
iBetween the length of difference * PDU;
Described PDU
iIn the length=described PDU of the SDU segmentation of losing
iThe length of data division-described PDU
iIn all read correct SDU and finish the indicated length of the pairing LI of segmentation;
Described PDU
I+nIn the length=described PDU of the SDU segmentation of losing
I+nIn the length of first LI indication.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101297000A CN101370165A (en) | 2007-08-17 | 2007-08-17 | Data packet transmission method for multimedia broadcasting service |
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|---|---|---|---|
| CNA2007101297000A CN101370165A (en) | 2007-08-17 | 2007-08-17 | Data packet transmission method for multimedia broadcasting service |
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ID=40413744
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| WO2010145231A1 (en) * | 2009-10-27 | 2010-12-23 | 中兴通讯股份有限公司 | Synchronization processing method for multimedia broadcast multicast service, upper layer network element, and lower layer network element thereof |
| CN101697546B (en) * | 2009-10-30 | 2012-10-03 | 南京中兴软创科技股份有限公司 | Method for implementing protocol data unit (PDU) used for packing and unpacking network bytes |
| CN101753272B (en) * | 2010-01-15 | 2013-12-04 | 华为技术有限公司 | Method, device and system for synchronously controlling window |
| CN105450613A (en) * | 2014-09-01 | 2016-03-30 | 展讯通信（上海）有限公司 | Data identification system and method |
| WO2016045472A1 (en) * | 2014-09-26 | 2016-03-31 | 电信科学技术研究院 | Method and device for data transmission on unlicensed frequency band |
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| CN108476197A (en) * | 2015-12-23 | 2018-08-31 | 诺基亚通信公司 | The method, apparatus and computer program product that PDU for being segmented according to SDU is formatted |
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| CN102055724A (en) * | 2009-10-27 | 2011-05-11 | 中兴通讯股份有限公司 | Synchronous processing method for multimedia broadcast multicast service, upper network element and lower network element |
| US8873450B2 (en) | 2009-10-27 | 2014-10-28 | Zte Corporation | Synchronization processing method for multimedia broadcast multicast service, upper layer network element, and lower layer network element thereof |
| WO2010145231A1 (en) * | 2009-10-27 | 2010-12-23 | 中兴通讯股份有限公司 | Synchronization processing method for multimedia broadcast multicast service, upper layer network element, and lower layer network element thereof |
| CN101697546B (en) * | 2009-10-30 | 2012-10-03 | 南京中兴软创科技股份有限公司 | Method for implementing protocol data unit (PDU) used for packing and unpacking network bytes |
| CN101753272B (en) * | 2010-01-15 | 2013-12-04 | 华为技术有限公司 | Method, device and system for synchronously controlling window |
| CN105450613B (en) * | 2014-09-01 | 2019-03-12 | 展讯通信（上海）有限公司 | A kind of data recognition system and method |
| CN105450613A (en) * | 2014-09-01 | 2016-03-30 | 展讯通信（上海）有限公司 | Data identification system and method |
| US10257820B2 (en) | 2014-09-26 | 2019-04-09 | China Academy Of Telecommunications Technology | Method and device for transmitting data in unauthorized frequency band |
| WO2016045472A1 (en) * | 2014-09-26 | 2016-03-31 | 电信科学技术研究院 | Method and device for data transmission on unlicensed frequency band |
| US10045254B2 (en) | 2015-01-12 | 2018-08-07 | Mediatek Inc. | Wireless communication method and device |
| WO2016112830A1 (en) * | 2015-01-12 | 2016-07-21 | Mediatek Inc. | Wireless communication method and device |
| US10609594B2 (en) | 2015-01-12 | 2020-03-31 | Mediatek Inc. | Wireless communication method and device that conditionally operates based on a length indicator type |
| CN108476197A (en) * | 2015-12-23 | 2018-08-31 | 诺基亚通信公司 | The method, apparatus and computer program product that PDU for being segmented according to SDU is formatted |
| WO2018059590A1 (en) * | 2016-09-30 | 2018-04-05 | 华为技术有限公司 | Data processing method, device, and system |
| KR20190052081A (en) * | 2016-09-30 | 2019-05-15 | 후아웨이 테크놀러지 컴퍼니 리미티드 | DATA PROCESSING METHOD, DEVICE, AND SYSTEM |
| KR102208262B1 (en) | 2016-09-30 | 2021-01-26 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Data processing methods, devices, and systems |
| US10999890B2 (en) | 2016-09-30 | 2021-05-04 | Huawei Technologies Co., Ltd. | Data processing method, apparatus, and system |
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Application publication date: 20090218 |