CN102594776B - The methods, devices and systems that a kind of Synchronization Source updates - Google Patents
The methods, devices and systems that a kind of Synchronization Source updates Download PDFInfo
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- CN102594776B CN102594776B CN201110004684.9A CN201110004684A CN102594776B CN 102594776 B CN102594776 B CN 102594776B CN 201110004684 A CN201110004684 A CN 201110004684A CN 102594776 B CN102594776 B CN 102594776B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0673—Clock or time synchronisation among packet nodes using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet
Abstract
The present invention discloses the methods, devices and systems that a kind of Synchronization Source updates, and wherein, described method includes: code stream is packaged into transmission bag by transmission equipment, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；Transmission bag after encapsulation is sent by described transmission equipment.Present invention uses Synchronization Source and update instruction so that reception equipment not will be considered that the Synchronization Source of renewal abandons code stream mistakenly for interference code stream.Additionally, by using Synchronization Source to update side-play amount, so that Synchronization Source starts to update the whole process updated to Synchronization Source crosses over multiple transmission bag, losing even if there being fractional transmission to wrap on network, the information that Synchronization Source updates also will not be lost.
Description
Technical field
The present invention relates to transmission technology in multimedia system, particularly relate to the methods, devices and systems that a kind of Synchronization Source updates.
Background technology
Along with the development of communication technology, the application of the transmission technology in multimedia system is more and more wider.At present, IPTV(InternetProtocolTelevision, internet protocol TV), VOIP(VoiceOverInternetProtocol, the networking telephone) and video monitoring service obtained increasingly being widely applied.
Synchronization Source can be identified for that the sender of code stream, and therefore, the recipient of code stream can distinguish normal code stream and interference code stream according to Synchronization Source, can determine the synchronised clock of code stream according to Synchronization Source simultaneously.During point-to-point communication, such as VOD service, video server is during sending program request program stream, the code stream of advertisement may be inserted in real time, the code stream of program and the code stream of advertisement there may be different Synchronization Source, code stream receiving terminal may think that the code stream of advertisement is to disturb code stream to abandon this code stream, and result causes reception to interrupt.During multi-point, such as video conference business, the recipient of code stream needs to receive the code stream of multiple sender simultaneously, and sender's Synchronization Source of code stream may be identical, result causes synchronization source identity confliction to code stream recipient, and the sender of code stream needs to update Synchronization Source.
Summary of the invention
The technical problem to be solved in the present invention proposes the methods, devices and systems that a kind of Synchronization Source updates, and can know the renewal of Synchronization Source in time realizing code stream recipient.
In order to solve the problems referred to above, the present invention provides a kind of method that Synchronization Source updates, including:
Code stream is packaged into transmission bag by transmission equipment, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；
Transmission bag after encapsulation is sent by described transmission equipment.
Preferably, said method has the following characteristics that
When code stream is packaged into transmission bag by described transmission equipment, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, and, the transmission bag that Synchronization Source updates adds Synchronization Source and updates side-play amount.
Preferably, said method has the following characteristics that
Code stream is packaged into when transmitting bag by described transmission equipment, and also in the one or more transmission bags after Synchronization Source updates, addition Synchronization Source updates instruction and Synchronization Source updates side-play amount.
Preferably, said method has the following characteristics that
Described Synchronization Source update before one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of, what Synchronization Source updated transmits the value of the Synchronization Source renewal side-play amount added in bag is 0, and the one or more Synchronization Source renewal side-play amounts added in bag of transmitting after Synchronization Source updates are negative value；Or,
One or more Synchronization Source renewal side-play amounts added in bag of transmitting before described Synchronization Source updates are negative value, Synchronization Source update transmission bag in add Synchronization Source update side-play amount value be 0, Synchronization Source update after one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of.
Preferably, said method has the following characteristics that
After reception equipment receives the transmission bag that transmission equipment sends, update instruction according to the Synchronization Source in transmission bag and Synchronization Source updates side-play amount, know the Synchronization Source after renewal.
In order to solve the problems referred to above, the present invention provides the device that a kind of Synchronization Source updates, including package module and sending module, wherein,
Described package module for being packaged into transmission bag by code stream, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；
Described sending module is for sending the transmission bag after encapsulation.
Preferably, said apparatus has the following characteristics that
When described package module is further used for being packaged into code stream transmission bag, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, in the transmission bag that Synchronization Source updates, add Synchronization Source renewal side-play amount, the one or more transmission bags after Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount.
Preferably, said apparatus has the following characteristics that
Described Synchronization Source update before one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of, what Synchronization Source updated transmits the value of the Synchronization Source renewal side-play amount added in bag is 0, and the one or more Synchronization Source renewal side-play amounts added in bag of transmitting after Synchronization Source updates are negative value；Or,
One or more Synchronization Source renewal side-play amounts added in bag of transmitting before described Synchronization Source updates are negative value, Synchronization Source update transmission bag in add Synchronization Source update side-play amount value be 0, Synchronization Source update after one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of.
In order to solve the problems referred to above, the present invention provides the system that a kind of Synchronization Source updates, including transmission equipment, wherein,
Described transmission equipment for being packaged into transmission bag by code stream, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；And, the transmission bag after encapsulation is sent.
Preferably, said system has the following characteristics that
When described transmission equipment is further used for being packaged into code stream transmission bag, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, in the transmission bag that Synchronization Source updates, add Synchronization Source renewal side-play amount, the one or more transmission bags after Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount.
Preferably, said system also includes reception equipment,
Described reception equipment, after receiving the transmission bag that described transmission equipment sends, updates instruction according to the Synchronization Source in transmission bag and Synchronization Source updates side-play amount, know the Synchronization Source after renewal.
Present invention uses Synchronization Source and update instruction so that reception equipment not will be considered that the Synchronization Source of renewal abandons code stream mistakenly for interference code stream.Additionally, by using Synchronization Source to update side-play amount, so that Synchronization Source starts to update the whole process updated to Synchronization Source crosses over multiple transmission bag, losing even if there being fractional transmission to wrap on network, the information that Synchronization Source updates also will not be lost.
Accompanying drawing explanation
Fig. 1 is the transmission packet structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the RTP(RealtimeTransportPacket of application example of the present invention, RTP) pack arrangement schematic diagram；
Fig. 3 is the front end code stream transmission flow schematic diagram of application example of the present invention；
Fig. 4 is that the terminal code stream of application example of the present invention receives schematic flow sheet.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can mutual combination in any.
The basic thought of the present invention is, updates Synchronization Source, and notice code stream recipient in time, prevent the interruption that the erroneous judgement of Synchronization Source in code stream is caused code stream to receive by code stream recipient by the way of transmission in band.
Specifically, send equipment (alternatively referred to as front end code stream sends equipment) and code stream is packaged into transmission bag, wherein, the transmission bag that Synchronization Source updates adds Synchronization Source and updates instruction；
Transmission bag after encapsulation is sent by described transmission equipment.
Updating instruction by adding Synchronization Source in the transmission bag that updates at Synchronization Source, the Synchronization Source of renewal abandons code stream mistakenly for interference code stream to make reception equipment not will be considered that.
Further, for the transmission packet loss preventing Synchronization Source from updating, even if guaranteeing under the network environment that there is packet loss, code stream recipient can the renewal of smoothing processing Synchronization Source in time, it is also possible to all adds Synchronization Source at multiple transmission bags and updates instruction and Synchronization Source updates side-play amount.Specifically, can be in the following way:
When code stream is packaged into transmission bag by described transmission equipment, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, and, the transmission bag that Synchronization Source updates adds Synchronization Source and updates side-play amount.And, also the one or more transmission bags after Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount.
Above-mentioned Synchronization Source updates the value of side-play amount and can arrange as follows:
Mode one:
Described Synchronization Source update before one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of, represent that Synchronization Source updates lead, the most again through just being updated Synchronization Source by the transmission bag of quantity determined by described Synchronization Source renewal side-play amount；It is 0 that the Synchronization Source added in the transmission bag that Synchronization Source updates updates the value of side-play amount, represents and updates Synchronization Source in described transmission bag；One or more Synchronization Source renewal side-play amounts added in bag of transmitting after Synchronization Source updates are negative value, i.e. before updated the transmission bag of absolute value institute quantification of side-play amount by Synchronization Source, have updated Synchronization Source.
Mode two:
One or more Synchronization Source renewal side-play amounts added in bag of transmitting before described Synchronization Source updates are negative value, represent that Synchronization Source updates lead, the most again through just being updated Synchronization Source by the transmission bag of quantity determined by described Synchronization Source renewal side-play amount；It is 0 that the Synchronization Source added in the transmission bag that Synchronization Source updates updates the value of side-play amount, represents and updates Synchronization Source in described transmission bag；Synchronization Source update after one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of, i.e. by Synchronization Source renewal side-play amount absolute value institute quantification transmission bag before have updated Synchronization Source.
Use aforesaid way one or mode two, can perform according to the agreement of the equipment of transmission and the equipment of reception.
To sum up, carrying Synchronization Source for identifying synchronisation source (prior art) in transmission bag, the Synchronization Source that the present invention proposes updates instruction for indicating the renewal process of Synchronization Source, and Synchronization Source updates side-play amount and is used for indicating Synchronization Source to update opportunity.
The present invention proposes, Synchronization Source field and Synchronization Source can be carried in the transport packet and update indication field and Synchronization Source updates offset field, but be not intended to described Synchronization Source field and Synchronization Source updates indication field and Synchronization Source updates offset field position in the transport packet and order.
After reception equipment (as terminal receives equipment) receives the transmission bag that transmission equipment sends, update instruction according to the Synchronization Source in transmission bag and Synchronization Source updates side-play amount, know the Synchronization Source after renewal.
When described terminal reception equipment Inspection to transmission bag carries Synchronization Source renewal instruction, detect synchronisation source during described transmission is wrapped and update offset field, described synchronisation source renewal offset field judge that Synchronization Source updates opportunity.After the reception equipment Inspection of described terminal updates to Synchronization Source, use new Synchronization Source.
Specifically, when using aforesaid way for the moment, terminal receives equipment can update Synchronization Source according to the following steps:
1, identify that synchronisation source updates pre-treatment
When detect transmission bag in Synchronization Source update side-play amount on the occasion of time, represent Synchronization Source will described transmission bag subsequent transmission bag in be updated, continue to subsequent transmission bag.
2, identify that synchronisation source renewal processes
When detecting that in transmission bag, Synchronization Source renewal side-play amount is 0, represent and update Synchronization Source in described transmission bag, use the described Synchronization Source transmitted in bag as new Synchronization Source.
3, identify that synchronisation source updates post processing
When detecting that in transmission bag, Synchronization Source renewal side-play amount is negative value, represent that Synchronization Source had been updated before described transmission bag, then the Synchronization Source in using described transmission to wrap is as new Synchronization Source.If being not received by Synchronization Source before described transmission bag to update the transmission bag that side-play amount is 0, then illustrate to update, at Synchronization Source described in transmitting procedure, the transmission packet loss that side-play amount is 0.
When using aforesaid way two, terminal receives equipment processing mode and is similar to, and here is omitted.
Correspondingly, the device that the Synchronization Source of the embodiment of the present invention updates, including package module and sending module, wherein,
Described package module for being packaged into transmission bag by code stream, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；
Described sending module is for sending the transmission bag after encapsulation.
When described package module can be further used for being packaged into code stream transmission bag, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, in the transmission bag that Synchronization Source updates, add Synchronization Source renewal side-play amount, the one or more transmission bags after Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount.
The system that the Synchronization Source of the embodiment of the present invention updates, including transmission equipment and reception equipment, wherein,
Described transmission equipment for being packaged into transmission bag by code stream, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；And, the transmission bag after encapsulation is sent.
When described transmission equipment can be further used for being packaged into code stream transmission bag, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, in the transmission bag that Synchronization Source updates, add Synchronization Source renewal side-play amount, the one or more transmission bags after Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount.
After described reception equipment can be used for receiving the transmission bag that described transmission equipment sends, update instruction according to the Synchronization Source in transmission bag and Synchronization Source updates side-play amount, know the Synchronization Source after renewal.
The present invention is further illustrated below with a concrete application example.
Fig. 2 is that this example expands Synchronization Source renewal indication field and the structural representation of Synchronization Source renewal offset field at RTP bag.
For ease of describing, this example employs two encoders as two-way code stream source, and one of them encoder A exports a road program A, an other encoder B and exports a road advertisement B.
Front end code stream sends equipment and receives the code stream of program A from encoder A, and the Synchronization Source of program A is 123456, and described front end code stream sends equipment and sent to terminal code stream reception equipment by the code stream received.Described front end code stream transmission equipment is during sending program A, if needing to insert advertisement B, described front end code stream sends equipment and receives the code stream of advertisement B from encoder B, then sends to terminal code stream reception equipment.The Synchronization Source of advertisement B is 654321, and Synchronization Source needs to update, and therefore, front end code stream sends equipment needs terminal code stream reception equipment of giving advance notice, and prevents terminal code stream from receiving equipment and is mistaken for disturbing code stream and terminating the reception of code stream.
As it is shown on figure 3, on the code stream transmission equipment of front end, synchronisation source updates and carries out by the following method:
Step 301: Synchronization Source updates pre-treatment.
After sending the code stream 10 minutes of program A, after determining 6 the RTP bags being further continued for sending program A, stopping sending the code stream of program A, preparation is initially inserted into the code stream of advertisement B.When sending last 6 RTP bags of program A, modifying described 6 RTP bags according to the order sent, respectively the P field in RTP bag is put 1, the afterbody at RTP bag adds Synchronization Source more newer field respectively, the value simultaneously putting described Synchronization Source more newer field is 1, add synchronisation source at described RTP bag afterbody respectively and update offset field, update offset field to the synchronisation source in described RTP bag respectively according to the order sent simultaneously and be entered as 6,5,4,3,2,1.
Wherein, the P field in RTP bag is put 1, represent and will comprise additional filler word at bag tail.
Step 302: Synchronization Source renewal processes.
After 6 RTP of described program A guarantee the repair free of charge and change and be sent, a RTP bag is taken out from the code stream of advertisement B, P field in described RTP bag is put 1, afterbody at described RTP bag adds Synchronization Source more newer field, the value simultaneously putting described Synchronization Source more newer field is 1, afterbody at described RTP bag adds synchronisation source and updates offset field, and the value simultaneously putting described Synchronization Source renewal offset field is 0, represents that unwrapping beginning Synchronization Source from described RTP has been updated.
Step 303: Synchronization Source updates post processing.
When continuing 6 the RTP bags sending described advertisement B, modifying this described 6 RTP bags according to the order sent, respectively the P field in described each RTP bag is put 1, the afterbody at described each RTP bag adds synchronisation source renewal identification field respectively, the value simultaneously putting described synchronisation source renewal identification field is 1, afterbody at described each RTP bag adds synchronisation source renewal offset field respectively, updates offset field to described synchronisation source respectively according to the order sent and is entered as-1 ,-2,-3,-4 ,-5 ,-6.
According to this method, before synchronisation source updates, carry out one section of smoothing processing, then update Synchronization Source, after synchronisation source updates, carry out one section of smoothing processing again.After being processed by the method for the invention, even if there is packet loss, this method is it is also ensured that terminal correctly identifies the renewal of Synchronization Source, it is possible to prevents terminal from erroneous judgement occur, thus provides Synchronization Source and smooth the guarantee means of renewal.
Terminal code stream receives equipment and receives the RTP bag of program A and buffer described RTP bag.When in the RTP bag described program A being detected, P field is 1, and detect when the Synchronization Source renewal indication field in described RTP bag is 1, detect synchronisation source in described RTP bag and update offset field, the value being updated offset field by described synchronisation source judges when Synchronization Source updates, after Synchronization Source updates, use new Synchronization Source.
As shown in Figure 4, on terminal code stream reception equipment, Synchronization Source updates and carries out by the following method:
Step 401: identify that synchronisation source updates pre-treatment
Receive the RTP bag of program A and process, detect P field in the RTP bag of described program A, when described P field is 1, detects Synchronization Source in described RTP bag and update indication field, if Synchronization Source renewal indication field is 1, shows that Synchronization Source updates and proceed by.Continue to RTP bag, when detecting that in follow-up RTP bag, the value of synchronisation source renewal offset field is 1, show that synchronisation source updates pre-treatment and is complete, Synchronization Source will be updated from the next RTP bag of described RTP bag.
Step 402: identify that synchronisation source renewal processes
When detecting that in RTP bag, Synchronization Source renewal side-play amount is 0, represent in described RTP bag, update Synchronization Source, use the Synchronization Source in described RTP bag as new Synchronization Source.
Step 402: identify that synchronisation source updates post processing.
Continue to follow-up RTP bag, if being not received by synchronisation source during whole reception to update the RTP bag that value is 0 of offset field, and have received synchronisation source and update the RTP bag that value is negative value of offset field, illustrate to there is packet loss on network during Synchronization Source updates, the Synchronization Source then using described synchronisation source to update in the RTP bag that value is negative value of offset field completes as new Synchronization Source, Synchronization Source renewal process.
One of ordinary skill in the art will appreciate that all or part of step in said method can instruct related hardware by program and complete, described program can be stored in computer-readable recording medium, such as read only memory, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuit to realize, and correspondingly, each module/unit in above-described embodiment can realize to use the form of hardware, it would however also be possible to employ the form of software function module realizes.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. the method that Synchronization Source updates, including:
Code stream is packaged into transmission bag by transmission equipment, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；
Transmission bag after encapsulation is sent by described transmission equipment；
When code stream is packaged into transmission bag by described transmission equipment, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, and, the transmission bag that Synchronization Source updates adds Synchronization Source and updates side-play amount.
2. the method for claim 1, it is characterised in that
Code stream is packaged into when transmitting bag by described transmission equipment, and also in the one or more transmission bags after Synchronization Source updates, addition Synchronization Source updates instruction and Synchronization Source updates side-play amount.
3. method as claimed in claim 2, it is characterised in that
Described Synchronization Source update before one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of, what Synchronization Source updated transmits the value of the Synchronization Source renewal side-play amount added in bag is 0, and the one or more Synchronization Source renewal side-play amounts added in bag of transmitting after Synchronization Source updates are negative value；Or,
One or more Synchronization Source renewal side-play amounts added in bag of transmitting before described Synchronization Source updates are negative value, Synchronization Source update transmission bag in add Synchronization Source update side-play amount value be 0, Synchronization Source update after one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of.
4. the method as described in Claims 2 or 3, it is characterised in that
After reception equipment receives the transmission bag that transmission equipment sends, update instruction according to the Synchronization Source in transmission bag and Synchronization Source updates side-play amount, know the Synchronization Source after renewal.
5. the device that a Synchronization Source updates, it is characterised in that include package module and sending module, wherein,
Described package module for being packaged into transmission bag by code stream, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；
Described sending module is for sending the transmission bag after encapsulation；
When described package module is further used for being packaged into code stream transmission bag, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, the transmission bag that Synchronization Source updates adds Synchronization Source renewal side-play amount.
6. device as claimed in claim 5, it is characterised in that
When described package module is further used for being packaged into code stream transmission bag, the one or more transmission bags after Synchronization Source updates also adds Synchronization Source and updates instruction and Synchronization Source updates side-play amount.
7. device as claimed in claim 6, it is characterised in that
Described Synchronization Source update before one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of, what Synchronization Source updated transmits the value of the Synchronization Source renewal side-play amount added in bag is 0, and the one or more Synchronization Source renewal side-play amounts added in bag of transmitting after Synchronization Source updates are negative value；Or,
One or more Synchronization Source renewal side-play amounts added in bag of transmitting before described Synchronization Source updates are negative value, Synchronization Source update transmission bag in add Synchronization Source update side-play amount value be 0, Synchronization Source update after one or more transmission bag in add Synchronization Source update side-play amount be on the occasion of.
8. the system that a Synchronization Source updates, it is characterised in that include transmission equipment, wherein,
Described transmission equipment for being packaged into transmission bag by code stream, wherein, adds Synchronization Source and update instruction in the transmission bag that Synchronization Source updates；And, the transmission bag after encapsulation is sent；
When described transmission equipment is further used for being packaged into code stream transmission bag, also the one or more transmission bags before Synchronization Source updates add Synchronization Source renewal instruction and Synchronization Source updates side-play amount, the transmission bag that Synchronization Source updates adds Synchronization Source renewal side-play amount.
9. system as claimed in claim 8, it is characterised in that
When described transmission equipment is further used for being packaged into code stream transmission bag, the one or more transmission bags after Synchronization Source updates also adds Synchronization Source and updates instruction and Synchronization Source updates side-play amount.
10. system as claimed in claim 8, it is characterised in that also include reception equipment,
Described reception equipment, after receiving the transmission bag that described transmission equipment sends, updates instruction according to the Synchronization Source in transmission bag and Synchronization Source updates side-play amount, know the Synchronization Source after renewal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110004684.9A CN102594776B (en) | 2011-01-11 | 2011-01-11 | The methods, devices and systems that a kind of Synchronization Source updates |
| PCT/CN2012/070175 WO2012094981A1 (en) | 2011-01-11 | 2012-01-10 | Method, device and system for updating synchronization source identifier |
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|---|---|
| CN102594776A (en) | 2012-07-18 |
| WO2012094981A1 (en) | 2012-07-19 |
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