CN101237276B - Mobile phone TV single-frequency network synchronization system and method based on mobile network - Google Patents
Mobile phone TV single-frequency network synchronization system and method based on mobile network Download PDFInfo
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- CN101237276B CN101237276B CN2007100369618A CN200710036961A CN101237276B CN 101237276 B CN101237276 B CN 101237276B CN 2007100369618 A CN2007100369618 A CN 2007100369618A CN 200710036961 A CN200710036961 A CN 200710036961A CN 101237276 B CN101237276 B CN 101237276B
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Abstract
The invention discloses a mobile phone TV single frequency network synchronization system based on a mobile network and a method. By periodically writing a synchronization time stamp, a maximum network delay and a PEIT interval pointer of a PEITn interval to which a PEITn table of an AVS system layer corresponds into the PEITn table of the AVS system layer, after a RNC end of a single frequency network receives the first packet of the PEITn interval, each RNC sends the first transmission packet of the PEITn interval at the time of a (STSn+M_DELAYn)percent GPS_ pulse period away from the nearest GPS, wherein, n is any positive integer, thereby ensuring that the mobile phone TV single frequency network synchronization based on the mobile network is realized under the condition of not producing extra network bandwidth cost.
Description
Technical field
The present invention relates to relate to a kind of mobile phone TV single-frequency network synchronization system, the invention still further relates to a kind of mobile phone TV single-frequency network method for synchronous based on mobile network.
Background technology
In the DVB_T/H terrestrial digital television system, in order to realize the synchronous of single frequency network (SFN), generally all be to use following method to realize: the multiplexing transmitting terminal of SFN adopts the MPEG2 re-multiplexer to filter and multiplexing program from the unlike signal source, as satellite network, SDH net, coding net, video multiplexer etc., add digital television service information (SI), and some or all channel carried out scrambling, the transport stream (TS) that will meet Moving Picture Experts Group-2 is then sent into single frequency adapter, enters the DVB-T modulator.By using described single frequency adapter standard time and the standard frequency of GPS can be inserted in the TS stream, its specific implementation method is that a huge level frame initial package (MIP) is inserted in the huge level frame the inside that the integral multiple to 8 frames of 8k pattern or 32 frames in the 2k pattern constitutes, described MIP can be inserted into any position of a huge level frame, and the MIPn that wherein is inserted into n huge level frame can help to determine the original position of n+1 huge level frame by pointer.Include following two in the MIP bag and realize the synchronous important parameters of SFN: synchronized timestamp (STS) and maximum network postpone, and wherein synchronized timestamp is used to describe the time difference that n+1 MIP wraps the actual start of the starting point of 1pps clock of front and this MIP; And maximum network postpones to be used to describe the maximum delay of n+1 huge level frame from single frequency adapter to each transmitter antenna.In this SFN method for synchronous, what single frequency adapter was exported is the mpeg 2 transport stream of a standard, owing in each huge level frame, all need to insert the MIP that a length is at least 232 bits, make utilization of network bandwidth reduce, therefore just compare nervous mobile network for original frequency resource, the overhead of the network bandwidth that the method for synchronous of this SFN brings is too big.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of mobile phone TV single-frequency network synchronization system based on mobile network, can guarantee can not to produce realize under the situation of extra network bandwidth expense synchronous based on the mobile phone TV single-frequency network of mobile network.For this reason, the present invention also provides a kind of mobile phone TV single-frequency network method for synchronous based on mobile network.
For solving the problems of the technologies described above, the invention provides a kind of mobile phone TV single-frequency network synchronization system based on mobile network, comprise multiplexing transmitting terminal, mobile core transmission network and single frequency network RNC end;
Described multiplexing transmitting terminal further comprises AVS system layer multiplexer and sync adapters; Wherein, described AVS system layer multiplexer is used for the transmission bit stream of a plurality of programs is multiplexed into systematic bits stream, output PEIT transport stream sequence; Described sync adapters is used for periodically calculating and synchronized timestamp, the maximum network of inserting this PEITn table institute corresponding PEITn interval in the PEITn of described PEIT transport stream sequence table postpones and PEIT interval pointer; Described synchronized timestamp refers to that relative PEITn shows the recent GPS reference pulse of first transmission package in pairing PEITn interval constantly and the time difference between first transmission package in this PEITn interval actual initial; Described maximum network postpones to refer to begin to transmit first transmission package in PEITn interval from described sync adapters, and each RNC in holding to described single frequency network RNC receives the maximum delay of this first transmission package; Described PEIT interval pointer is meant the interval between PEITn table and the PEITn interval; Wherein n is any positive integer;
Described single frequency network RNC end comprises a plurality of RNC; Described RNC is used for sending in the moment of (STSn+M_DELAYn) %GPS pulse period of a nearest GPS reference pulse first transmission package in this PEITn interval, and % represents modulo operation; Comprise a plurality of synchronous RNC among described a plurality of RNC; The PEIT transfer sequence that described a plurality of synchronous RNC is used for receiving by core net is at first by PEIT identifier 0x000F search PEIT transmission package, then this PEIT transmission package is resolved n synchronized timestamp STSn and n maximum network of obtaining the PEITn interval and postpone M_DELAYn, and obtain the position of interval first bag of PEITn by the interval pointer in described PEITn interval; Wherein n is any positive integer.
The present invention also provides a kind of mobile phone TV single-frequency network method for synchronous based on mobile network, comprises the steps:
(1) multiplexing transmitting terminal periodically carries out following operation: first bit that at first calculates first bag in PEITn interval begins and time difference of a last GPS reference pulse, i.e. n synchronized timestamp STSn; Then, determine that n maximum network postpones M_DELAYn; N synchronized timestamp STSn and n maximum network delay M_DELAYn are written in the PEITn table; And then with PEIT at interval pointer Pointer_n write in the PEITn table, with the packing of PEITn table and send; Send the PEITn-1 interval then;
(2) after single frequency network RNC end receives a PEIT sequence of AVS system layer by core net, at first by PEIT identifier 0x000F search PEIT transmission package, resolve the PEITn table and obtain n the synchronized timestamp STSn and n the maximum network delay M_DELAYn in PEITn interval, and obtain the position of first bag in PEITn interval by the PETI interval pointer pointer_n in PEITn interval; Each RNC in the moment of (STSn+M_DELAYn) %GPS_ pulse period of a nearest GPS reference pulse, sends first transmission package in this PEITn interval after receiving first bag in this PEITn interval, and % represents modulo operation.
Wherein, n is any positive integer.
The present invention is owing to adopted technique scheme, has such beneficial effect, the synchronized timestamp, the maximum network that write pairing PEIT interval in promptly showing by each PEIT at the PEIT of AVS system layer transfer sequence postpone and PEIT interval pointer, thereby have realized the mobile TV list based on mobile network
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 the present invention is based on the mobile phone TV single-frequency network synchronization system configuration diagram of mobile network for basis;
The schematic diagram of PEIT transport stream first three time cycle of sequence that Fig. 2 delays when inserting synchronized timestamp and maximum network according to the present invention;
Fig. 3 is for determining the schematic diagram of synchronized timestamp according to the present invention;
Fig. 4 is the exemplary flow schematic diagram that generates PEIT transport stream sequence according to the present invention at multiplexing transmitting terminal;
Fig. 5 is for sending the exemplary flow schematic diagram in the moment of first bag in PEIT interval synchronously at each RNC of single frequency network RNC end control according to the present invention;
Fig. 6 is the transmission time sequence figure of first bag in the PEITn interval according to the present invention.
Embodiment
In one embodiment, the system architecture schematic diagram of the mobile phone TV single-frequency network synchronization system based on mobile network of the present invention comprises multiplexing transmitting terminal, mobile core transmission network and single frequency network RNC end as shown in Figure 1.
Wherein, described multiplexing transmitting terminal further comprises AVS system layer multiplexer and sync adapters.Described AVS (advanced audio/video coding) system layer multiplexer is used for the transmission bit stream of a plurality of programs is multiplexed into systematic bits stream, and output meets the transport stream sequence of PEIT (program element information table, program component information table) standard.Described sync adapters is used for periodically calculating and standard time and the standard frequency of GPS is inserted into described PEIT transport stream sequence, and this is to postpone M_DELAYn and PEIT interval pointer pointer_n realizes by synchronized timestamp STSn, the maximum network of inserting this PEITn table institute corresponding PEITn interval in the table of the PEITn in described transport stream sequence in the present invention.The schematic diagram that is exemplified as PEIT transport stream first three time cycle of sequence of delaying when inserting synchronized timestamp and maximum network as shown in Figure 2, the synchronized timestamp STS0 and the maximum network that wherein are inserted with the PEIT0 interval in the PEIT0 table postpone M_DELAY0, the synchronized timestamp STS1 and the maximum network that are inserted with the PEIT1 interval in the PEIT1 table postpone M_DELAY1, and the synchronized timestamp STS2 and the maximum network that are inserted with the PEIT2 interval in the PEIT2 table postpone M_DELAY2.With reference to Fig. 3 as can be known, n synchronized timestamp STSn refers to that the recent GPS reference pulse of first transmission package that relative PEITn shows pairing PEITn interval constantly and the time difference between first transmission package in this PEITn interval actual initial.Because the transmission path difference of each PEIT interval in described multiplexing transmitting terminal arrives the core net of each RNC the described single frequency network RNC end, so it is also different that each RNC receives the actual time delay of first bag in this PEIT interval, therefore in order to guarantee that each RNC sends the uniqueness in the moment of first bag in each PEIT interval synchronously, need to determine that maximum network postpones, wherein n maximum network delay M_DELAYn is meant first transmission package that begins to transmit the PEITn interval from sync adapters, each RNC sends the maximum delay of this first transmission package in the described single frequency network RNC end, and therefore first transmission package in the PEITn interval that the PEITn table is corresponding in the present invention should be maximum network delay M_DELAYn in the transmitting time (corresponding to the time of synchronized timestamp STSn) of multiplexing transmitting terminal to the time difference that sends first bit of this first transmission package from each RNC.Merit attention to such an extent that be, in the present invention, in order to guarantee that single frequency network synchronously can operate as normal at mobile network, the span that maximum network is postponed is set at 0x0000000-0x1312CFF, and the value of GPS pulse period should postpone more than or equal to maximum network, and the pulse period length of getting GPS in the present invention is 2s.PEIT interval pointer pointer_n is meant the interval between PEITn table and the PEITn interval, because current pointer is meant in first TP of PEITn table, therefore this PEIT interval pointer pointer_n equals TP (the transport packet of PEITn table, transmission package) the TP number-1 of the TP number in number+PEITn-1 interval+PEITn+1 table, therefore by PEIT at interval pointer pointer_n can determine the position of first bag in PEITn interval.Wherein, the n that is mentioned is any positive integer.
Described single frequency network RNC end further comprises a plurality of synchronous RNC and a plurality of RNC.Wherein, the PEIT transfer sequence that described a plurality of synchronous RNC is used for receiving by core net is at first by PEIT identifier 0x000F search PEIT transmission package, then this PEIT transmission package is resolved the synchronized timestamp STSn and the maximum network that obtain the PEITn interval and postpone M_DELAYn, and obtain the position of interval first bag of this PEITn by the PEIT interval pointer in described PEITn interval.Described RNC be used for the moment of (STSn+M_DELAYn) %GPS pulse period of a nearest GPS reference pulse (promptly the STSn of a nearest GPS reference pulse and M_DELAYn add and to moment of GPS pulse period delivery), send first transmission package in this PEITn interval.Wherein, the n that is mentioned is any positive integer.
Specify the mobile phone TV single-frequency network method for synchronous based on mobile network of the present invention below by a specific embodiment.
At multiplexing transmitting terminal, as shown in Figure 4, first bit that at first calculates first bag in PEITn interval begins and time difference of a last GPS reference pulse, i.e. synchronized timestamp STSn; Then, determine that maximum network postpones M_DELAYn; STSn and M_DELAYn are written in the PEITn table; And then with PEIT at interval pointer Pointer_n write in the PEITn table, with the packing of PEITn table and send; Send the PEITn-1 interval then.Above-mentioned steps is to carry out once in each PEIT cycle, and therefore n wherein is any positive integer.The length in one of them PEIT cycle equals a PEITn table and the interval sum of a PEITn-1, is generally less than to equal 256 TP, and wherein each TP length is 188 bytes.
After single frequency network RNC end receives a PEIT sequence of AVS system layer by core net, as shown in Figure 5, at first by PEIT identifier 0x000F search PEITn transmission package, resolve this PEITn table and obtain synchronized timestamp STSn and maximum network delay M_DELAYn, and obtain the position of first bag in PEITn interval by PEIT interval pointer pointer_n; Each RNC in the moment of (STSn+M_DELAYn) %GPS_ pulse period of a nearest GPS reference pulse, sends first transmission package in this PEITn interval after receiving first bag in this PEITn interval.Therefore above-mentioned steps also is to carry out once in each PEIT cycle, and n wherein is 0 or positive integer arbitrarily.
Therefore, by top description as can be known, in the present invention, the transmission time sequence of first bag in any one PEITn interval as shown in Figure 6.Wherein, n is any positive integer.
Claims (6)
1. the mobile phone TV single-frequency network synchronization system based on mobile network is characterized in that, comprises multiplexing transmitting terminal, mobile core transmission network and single frequency network wireless network controller (RNC) end;
Described multiplexing transmitting terminal further comprises advanced audio/video coding (AVS) system layer multiplexer and sync adapters; Wherein, described AVS system layer multiplexer is used for the transmission bit stream of a plurality of programs is multiplexed into systematic bits stream, output program component information table (PEIT) transport stream sequence; Described sync adapters is used for periodically calculating and synchronized timestamp, the maximum network of inserting this PEITn table institute corresponding PEITn interval in n the PEIT (PEITn) of described PEIT transport stream sequence table postpones and PEIT interval pointer; Described synchronized timestamp refers to that relative PEITn shows the recent GPS reference pulse of first transmission package in pairing PEITn interval constantly and the time difference between first transmission package in this PEITn interval actual initial; Described maximum network postpones to refer to begin to transmit first transmission package in PEITn interval from described sync adapters, and each RNC in holding to described single frequency network RNC receives the maximum delay of this first transmission package; Described PEIT interval pointer is meant the interval between PEITn table and the PEITn interval; Wherein n is any positive integer;
Described single frequency network RNC end comprises a plurality of RNC; Described RNC is used for sending in the moment of (STSn+M_DELAYn) %GPS pulse period of a nearest GPS reference pulse first transmission package in this PEITn interval, and % represents modulo operation; Comprise a plurality of synchronous RNC among described a plurality of RNC; The PEIT transfer sequence that described a plurality of synchronous RNC is used for receiving by core net is at first by PEIT identifier 0x000F search PEIT transmission package, then this PEIT transmission package is resolved n synchronized timestamp STSn and n maximum network of obtaining the PEITn interval and postpone M_DELAYn, and obtain the position of interval first bag of PEITn by the interval pointer in described PEITn interval; Wherein n is any positive integer.
2. the mobile phone TV single-frequency network synchronization system based on mobile network according to claim 1, it is characterized in that, the span that described maximum network postpones is set at 0x0000000-0x1312CFF, and the value of GPS pulse period should postpone more than or equal to maximum network.
3. the mobile phone TV single-frequency network synchronization system based on mobile network according to claim 2 is characterized in that, the described GPS pulse period is 2s.
4. the mobile phone TV single-frequency network synchronization system based on mobile network according to claim 1, it is characterized in that, described PEIT pointer transmission package (TP) number that equals the PEITn table TP number that adds the PEITn-1 interval at interval adds the TP number-1 of PEITn+1 table, and wherein n is any positive integer.
5. the mobile phone TV single-frequency network synchronization system based on mobile network according to claim 1, it is characterized in that, described sync adapters calculate and the table of the PEITn in described PEIT transport stream sequence in insert this PEITn table institute corresponding PEITn interval synchronized timestamp, maximum network postpone and the cycle of PEIT interval pointer is a PEIT cycle, its length equals a PEITn and shows pairing TP number and the interval pairing TP number sum of PEITn-1, smaller or equal to 256 TP, wherein each TP length is 188 bytes, and n is any positive integer.
6. the mobile phone TV single-frequency network method for synchronous based on mobile network is characterized in that, comprises the steps:
(1) multiplexing transmitting terminal periodically carries out following operation: first bit that calculates first interval bag of n PEIT (PEITn) begins and time difference of a last GPS reference pulse, i.e. n synchronized timestamp STSn; Then, determine that n maximum network postpones M_DELAYn; N synchronized timestamp STSn and n maximum network delay M_DELAYn are written in the PEITn table; And then with program component information table (PEIT) at interval pointer Pointer_n write in the PEITn table, with the packing of PEITn table and send; Send the PEITn-1 interval then;
(2) when single frequency network wireless network controller (RNC) end receives a PEIT sequence of advanced audio/video coding (AVS) system layer by core net after, at first by PEIT identifier 0x000F search PEIT transmission package, resolve the PEITn table and obtain n the synchronized timestamp STSn and n the maximum network delay M_DELAYn in PEITn interval, and obtain the position of first bag in PEITn interval by the PETI interval pointer pointer_n in PEITn interval; Each RNC in the moment of (STSn+M_DELAYn) %GPS_ pulse period of a nearest GPS reference pulse, sends first transmission package in this PEITn interval after receiving first bag in this PEITn interval, and % represents modulo operation;
Wherein, n is any positive integer.
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| CN101605041B (en) * | 2008-09-18 | 2011-04-06 | 华为技术有限公司 | Method, device and system for configuring multicast unifrequent network sources |
| CN101562597B (en) * | 2009-05-20 | 2011-11-30 | 中兴通讯股份有限公司 | Device and method for estimating and compensating sampling clock offset of handset television terminal |
| CN103826084A (en) * | 2014-02-17 | 2014-05-28 | 宁波公众信息产业有限公司 | Audio encoding method |
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| CN1678068A (en) * | 2004-04-01 | 2005-10-05 | 清华大学 | Single frequency network system of terrestrial digital TV broadcasting and its realization method |
| JP2006005615A (en) * | 2004-06-17 | 2006-01-05 | Eiden Kk | Single-frequency network digital terrestrial broadcasting system, synchronization system for single-frequency network, and transmitting device |
| CN101150356A (en) * | 2006-09-22 | 2008-03-26 | 华为技术有限公司 | A method, center transmitter and remote transmitter for realizing single-frequency network synchronization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678068A (en) * | 2004-04-01 | 2005-10-05 | 清华大学 | Single frequency network system of terrestrial digital TV broadcasting and its realization method |
| JP2006005615A (en) * | 2004-06-17 | 2006-01-05 | Eiden Kk | Single-frequency network digital terrestrial broadcasting system, synchronization system for single-frequency network, and transmitting device |
| CN101150356A (en) * | 2006-09-22 | 2008-03-26 | 华为技术有限公司 | A method, center transmitter and remote transmitter for realizing single-frequency network synchronization |
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Application publication date: 20080806 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinji Lease (Tianjin) Co.,Ltd. Contract record no.: 2018990000196 Denomination of invention: Mobile phone TV single-frequency network synchronization system and method based on mobile network Granted publication date: 20110601 License type: Exclusive License Record date: 20180801 |
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