CN1960435A - Method and system for synchronizing broadcast time of mobile multimedia - Google Patents
Method and system for synchronizing broadcast time of mobile multimedia Download PDFInfo
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- CN1960435A CN1960435A CN 200610109974 CN200610109974A CN1960435A CN 1960435 A CN1960435 A CN 1960435A CN 200610109974 CN200610109974 CN 200610109974 CN 200610109974 A CN200610109974 A CN 200610109974A CN 1960435 A CN1960435 A CN 1960435A
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Abstract
The method comprises: a) the main devices at mobile multimedia broadcast system side all are synchronized on one system; b) when the mobile multimedia broadcast system side sends a full-frame data, it carries one clock signal message; after the terminal receives the data carrying the clock signal, it converts the clock signal into local time and uses the local clock to make correction.
Description
Technical field
The invention belongs to Mobile Multimedia Broadcasting or technical field of mobile TV, specially refer to a kind of method and system of clock synchronization of the real-time video audio stream of realizing Mobile Multimedia Broadcasting.
Background technology
Mobile Multimedia Broadcasting is a kind of Play Technique for Multimedia of rising in recent years.By hand-held terminal, under the situation of high-speed mobile, can watch TV.Terminal receives programme by wireless protocols, and can select the channel of oneself having the right to watch, thereby can receive the multi-medium data of selecting channel, is implemented in and sees TV on the portable terminal.
The aerial data of system emission are divided into different channels, and the data of each channel comprise again: three types of video, audio frequency and data, requirement can guarantee energy synchronous playing between terminal and the system, be that clock is synchronous, also require terminal can guarantee the synchronous playing of video/audio, promptly labial is synchronous.Clock synchronization is basic functions in the multi-media broadcasting system.
In the multimedia broadcasting field, the method for existing assurance clock synchronization has 2 kinds.A kind of is TS (transport stream) agreement, constantly sends Program Clock Reference (PCR) bag by system side, allows ceaselessly position of terminal, is synchronous with the clock that guarantees terminal and the clock of system equipment.Another kind method is NTP (NTP (Network Time Protocol)), and at set intervals, for example 1 hour, server and client were done once mutual, proofreaded the time.
First method is adapted at using in the circuit network, also is fit to unidirectional broadcast network and uses, and clock can guarantee very accurate, but the TS mode will send 3 TS each second at least wraps position, each is surrounded by 188 byte-sized, has wasted bandwidth resources, the complexity height of TS realization simultaneously; Second method is adapted at using in the IP network, and is very little to the expense of the network bandwidth, is two-way but require network, can only use in interactive network, is not suitable for using in the radio network.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and system of Mobile Multimedia Broadcasting clock synchronization, allows keep clock synchronization between terminal and system coding and the wireless transmitting device.
In order to address the above problem, the present invention proposes a kind of by clock signal of emission in the skyborne special passage, realizes the method for the clock synchronization of mobile multimedia broadcast system, may further comprise the steps:
(a) capital equipment of mobile multimedia broadcast system side all clock synchronization on same system;
(b) during full frame structured data of the every transmission of mobile multimedia broadcast system side, carry a clock signal message;
(c) after terminal receives the data that carry clock signal, this clock signal is converted to local zone time, local clock is proofreaied and correct.
Further, said method also can have following characteristics: in the described step (a), described system side capital equipment comprises encoder, transcoder, multiplexer.
Further, said method also can have following characteristics: system side is to send the full frame structured data with Fixed Time Interval in the described step (b).
Further, said method also can have following characteristics: described step (c) position when starting up of terminal, subsequently, terminal is proofreaied and correct once at set intervals again.
Further, said method also can have following characteristics: in the described step (b), described full frame structured data is made up of N passage, and each passage provides fixed-bandwidth, carries clock signal at passage 0, and the data length of this clock signal is 4 bytes.
Further, said method also can have following characteristics: described step (a) is that all clock synchronization is to gps system with the capital equipment of system side, and described clock signal is the gps clock signal.
Further, said method also can have following characteristics: in the described step (c), be that described gps clock signal is converted to local zone time by the time zone, this local zone time of timing is set to the time of this equipment.
The present invention proposes a kind of Mobile Multimedia Broadcasting clock system, comprising: clock generating unit, clock transmitter unit and terminal,
Described clock generating unit is responsible for clock sync signal is passed to the clock transmitter unit, further comprises encoder, transcoder and multiplexer, and the clock synchronization of this encoder, transcoder and multiplexer is on same system;
Described clock transmitter unit is satellites transmits station and/or ground supplement cell site, carries described clock information signal in each the full frame structured data that sends to terminal;
After described terminal receives the data that carry clock signal, this clock signal is converted to local zone time, local clock is proofreaied and correct.
Further, said system also can have following characteristics: described clock transmitter unit sends radio broadcasting full frame structured data in Fixed Time Interval, wherein, the full frame structured data is made up of N passage, and each passage provides fixing bandwidth, comprise clock signal in passage 0, the data length of this clock signal is 4 bytes.
Further, said system also can have following characteristics: described clock signal is a gps time, and terminal 6 is positions at set intervals after when start and start, and timing is converted to local zone time with gps time by the time zone, and the time of this equipment of being set to.
Prior art adopts the TS mode to realize, the complexity height that TS realizes need send several clock check and correction bags each second, and each is surrounded by 188 byte longs, has brought the expense of radio spectrum resources.Compared with prior art, the present invention can send a system clock in each second and guarantee clock synchronization, and overhead is very little.The present invention is adapted at using in the radio network, the clock synchronization between energy realization system and the terminal 6.
Description of drawings
Fig. 1 is the schematic diagram of the system clock transmission method among the embodiment.
Fig. 2 is the clock synchronization schematic diagram of the system side equipment among the embodiment.
Embodiment
The present invention is a kind of method of Mobile Multimedia Broadcasting clock synchronization, in each Fixed Time Interval, sends a clock signal in radio channel, and terminal 6 can be come the correcting local clock by this clock information, thereby can guarantee clock synchronization.Said method comprising the steps of:
Step 100, the capital equipment of system side comprises encoder 1, transcoder 2, multiplexer 3 etc., and all clock synchronization is on same system, and the system that produces common clock can be GPS (global positioning system).
In case owing to asynchronous between encoder 1, transcoder 2, multiplexer 3 equipment, the time has been grown, and just forms cumulative errors, cause buffering area to overflow, and regular check and correction can be eliminated cumulative errors.So, the clock synchronization of encoder 1, transcoder 2, multiplexer 3 equipment to same equipment, GPS for example.Clock synchronization allows 3 equipment produce synchronous code stream, has promptly eliminated the code stream of cumulative errors.
Step 110, equipment such as encoder 1, transcoder 2 and multiplexer 3 are encapsulated into channel datas such as video, audio frequency and synchrodata in each data channel jointly, and the data that will carry clock signal send to satellites transmits station 4, perhaps, send to the place and augment the cell site through transmitting network;
Radio broadcasting can send 1 full frame structured data in a Fixed Time Interval, wherein, the data length of clock signal is 4 bytes (also can be other byte number), described Fixed Time Interval can be 1 second, 0.5 second kind or 0.25 second, also can be the other times value.The full frame structured data is made up of N passage, and each passage provides fixing bandwidth.Port number N is a fixing natural number.Wherein, passage 0 is special, except that carrying clock signal, also is used for transmitting control information and the rendition list.Remaining passage 1 is used for Data transmission to passage N-1.As shown in Figure 1, just transmit an accurate international time each second, as: Greenwich Mean Time.
Step 120 after satellites transmits station 4 receives the data of multiplexer 3, is given terminal 6 with the data that carry clock signal;
Ground supplement cell site 5 also can be passed through with the data that carry clock signal in satellites transmits station 4, gives terminal 6 multimedia broadcast signal.
Step 130 after terminal 6 receives the data that carry clock signal, is converted to local zone time according to described clock, position when terminal 6 starts, and subsequently, terminal 6 needs position again at set intervals.
When clock signal is gps signal, it is converted to local zone time by the time zone, the time that the time after the conversion is set to this equipment is position.
Terminal 6 need be taken out the time in the passage 0 at set intervals, proofreads one time clock, and the time interval can be adjusted as required, as: the time interval is 1 hour or 10 minutes.Can be provided with as required the opportunity that but it should be noted that correction, and the present invention is not limited to certain fixed form.
Among the embodiment as shown in Figure 2, each data channel has the speed of 128Kbit/s, and 1 channel has comprised 2 data passages, and the speed of 256Kbit/s can be arranged.In system side, the clock of encoder 1, transcoder 2, multiplexer 3 all is synchronized to GPS.The data that comprise clock signal that multiplexer 3 is received output to satellites transmits station 4, send to terminal 6 by satellites transmits station 4, perhaps send to terminal 6 by satellites transmits station 4 via ground supplement cell site 5.After terminal 6 start, receive wireless signal after, the extraction system clock is adjusted the clock of terminal 6.Every one hour, terminal 6 was taken out the system clock of passage 0, and is the Adjustment System time, synchronous to guarantee terminal 6 and system equipment.
The present invention proposes a kind of system of Mobile Multimedia Broadcasting clock synchronization, comprising: clock generating unit, clock transmitter unit and terminal 6,
Described clock generating unit is responsible for clock sync signal is passed to the clock transmitter unit.In a Fixed Time Interval, send 1 radio broadcasting full frame structured data, wherein, the data length of clock signal is 4 bytes (also can be other byte number), described Fixed Time Interval can be 1 second, 0.5 second kind or 0.25 second, also can be the other times value.The full frame structured data is made up of N passage, and each passage provides fixing bandwidth, and port number N is a fixing natural number.Wherein, passage 0 is special, is used for transmitting control information and the rendition list.Clock has been also placed in the passage 0 and has transmitted, and just transmits an accurate international time each second, as: Greenwich Mean Time.Remaining passage 1 is used for Data transmission to passage N-1.Described clock generating unit further comprises:
Encoder 1 be responsible for encoding operation, and the data after will encoding outputs in the transcoder 2;
Transcoder 2 is responsible for protocol conversion and media format conversion, and exports each channel data behind the described transcoding to multiplexer 3;
Multiplexer 3 is responsible for finishing modulation and multiplexing function, each channel data is multiplexed on the described multiplexer 3, and the full frame structured data is outputed to the clock transmitter unit;
The clock synchronization of described encoder 1, transcoder 2, multiplexer 3 equipment to same equipment, GPS (global positioning system) for example.
Described clock transmitter unit further comprises:
Satellites transmits station 4 after receiving the data that comprise described clock signal, is given terminal 6 wireless signal; And/or
Ground supplement cell site 5 is used for giving terminal 6 wireless signal after receiving the data that include clock signal of being sent by satellites transmits station 4.
Described terminal 6 is responsible for the data that the receive clock transmitter units are sent, and the clock signal of carrying in the data is converted to local zone time, and in terminal 6 starts position.Timing is converted to local zone time with gps time by the time zone, and the time of this equipment of being set to.After start, proofread clock at set intervals one time, as: every 1 hour the check and correction once or every 10 minutes the check and correction clock.
Claims (10)
1, a kind of method of Mobile Multimedia Broadcasting clock synchronization said method comprising the steps of:
(a) capital equipment of mobile multimedia broadcast system side all clock synchronization on same system;
(b) during full frame structured data of the every transmission of mobile multimedia broadcast system side, carry a clock signal message;
(c) after terminal receives the data that carry clock signal, this clock signal is converted to local zone time, local clock is proofreaied and correct.
2, method according to claim 1 is characterized in that:
In the described step (a), described system side capital equipment comprises encoder, transcoder, multiplexer.
3, method according to claim 1 is characterized in that:
System side is to send the full frame structured data with Fixed Time Interval in the described step (b).
4, method according to claim 1 is characterized in that:
Described step (c) position when starting up of terminal, subsequently, terminal is proofreaied and correct once at set intervals again.
5, method according to claim 1 is characterized in that:
In the described step (b), described full frame structured data is made up of N passage, and each passage provides fixed-bandwidth, carries clock signal at passage 0, and the data length of this clock signal is 4 bytes.
6, method according to claim 1 is characterized in that:
Described step (a) is that all clock synchronization is to gps system with the capital equipment of system side, and described clock signal is the gps clock signal.
7, as method as described in the claim 6, it is characterized in that:
In the described step (c), be that described gps clock signal is converted to local zone time by the time zone, this local zone time of timing is set to the time of this equipment.
8, a kind of Mobile Multimedia Broadcasting clock system comprises: clock generating unit, clock transmitter unit and terminal,
Described clock generating unit is responsible for clock sync signal is passed to the clock transmitter unit, further comprises encoder, transcoder and multiplexer, and the clock synchronization of this encoder, transcoder and multiplexer is on same system;
Described clock transmitter unit is satellites transmits station and/or ground supplement cell site, carries described clock information signal in each the full frame structured data that sends to terminal;
After described terminal receives the data that carry clock signal, this clock signal is converted to local zone time, local clock is proofreaied and correct.
9, as system as described in the claim 8, it is characterized in that:
Described clock transmitter unit sends radio broadcasting full frame structured data in Fixed Time Interval, wherein, the full frame structured data is made up of N passage, and each passage provides fixing bandwidth, comprise clock signal in passage 0, the data length of this clock signal is 4 bytes.
10, as system as described in the claim 8, it is characterized in that:
Described clock signal is a gps time, and terminal is a position at set intervals after when start and start, and timing is converted to local zone time with gps time by the time zone, and the time of this equipment of being set to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2006101099749A CN1960435B (en) | 2006-08-25 | 2006-08-25 | Method and system for synchronizing broadcast time of mobile multimedia |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101099749A CN1960435B (en) | 2006-08-25 | 2006-08-25 | Method and system for synchronizing broadcast time of mobile multimedia |
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| CN1960435A true CN1960435A (en) | 2007-05-09 |
| CN1960435B CN1960435B (en) | 2010-10-06 |
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| CN2006101099749A Expired - Fee Related CN1960435B (en) | 2006-08-25 | 2006-08-25 | Method and system for synchronizing broadcast time of mobile multimedia |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101959036A (en) * | 2009-07-16 | 2011-01-26 | 华为终端有限公司 | Method and device for calibrating local time |
| CN101437112B (en) * | 2007-11-14 | 2011-05-11 | 智辉研发股份有限公司 | Method of identifying target synchronization point pair through scan-line image matching scheme |
| CN101505215B (en) * | 2009-03-05 | 2011-07-13 | 中兴通讯股份有限公司 | Method and apparatus for time clock synchronization |
| CN102355347A (en) * | 2011-07-11 | 2012-02-15 | 中国石油化工集团公司 | Excitation and reception signal synchronizing system in seismic exploration |
| CN102572711A (en) * | 2012-01-21 | 2012-07-11 | 中广传播集团有限公司 | Terminal clock and external clock difference synchronization method |
| WO2017024782A1 (en) * | 2015-08-07 | 2017-02-16 | 中兴通讯股份有限公司 | Clock synchronization method, device, base station and storage medium in a satellite communication network |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000184433A (en) * | 1998-12-11 | 2000-06-30 | Nec Corp | Radio channel multiplex communication system in cdma mobile communication system |
| JP2001016586A (en) * | 1999-07-01 | 2001-01-19 | Matsushita Electric Ind Co Ltd | Image decoder |
| BR0309411A (en) * | 2002-04-22 | 2005-02-01 | Nokia Corp | Method for displaying content associated with the broadcasting program on the user terminal of a telecommunication system, media system, user terminal, and server |
| US7136388B2 (en) * | 2002-06-27 | 2006-11-14 | Alcatel | Clock synchronization system and method for use in a scalable access node |
| US20040055013A1 (en) * | 2002-07-04 | 2004-03-18 | Toshiyuki Ishioka | Broadcast receive/play system and broadcast reception apparatus |
| DE602004022072D1 (en) * | 2003-10-06 | 2009-08-27 | Panasonic Corp | SYNCHRONIZE A DIGITAL SIGNAL BY USING A PCR PROGRAM TACT REFERENCE |
-
2006
- 2006-08-25 CN CN2006101099749A patent/CN1960435B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101437112B (en) * | 2007-11-14 | 2011-05-11 | 智辉研发股份有限公司 | Method of identifying target synchronization point pair through scan-line image matching scheme |
| CN101505215B (en) * | 2009-03-05 | 2011-07-13 | 中兴通讯股份有限公司 | Method and apparatus for time clock synchronization |
| CN101959036A (en) * | 2009-07-16 | 2011-01-26 | 华为终端有限公司 | Method and device for calibrating local time |
| CN102355347A (en) * | 2011-07-11 | 2012-02-15 | 中国石油化工集团公司 | Excitation and reception signal synchronizing system in seismic exploration |
| CN102572711A (en) * | 2012-01-21 | 2012-07-11 | 中广传播集团有限公司 | Terminal clock and external clock difference synchronization method |
| WO2017024782A1 (en) * | 2015-08-07 | 2017-02-16 | 中兴通讯股份有限公司 | Clock synchronization method, device, base station and storage medium in a satellite communication network |
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| Publication number | Publication date |
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| CN1960435B (en) | 2010-10-06 |
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