CN101009823A - A channel switching method - Google Patents
A channel switching method Download PDFInfo
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- CN101009823A CN101009823A CNA2006100017455A CN200610001745A CN101009823A CN 101009823 A CN101009823 A CN 101009823A CN A2006100017455 A CNA2006100017455 A CN A2006100017455A CN 200610001745 A CN200610001745 A CN 200610001745A CN 101009823 A CN101009823 A CN 101009823A
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- information
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Abstract
The provided channel-switch method comprises: storing the position message of every menu frame into mobile terminal to let the terminal determine the receiving time for menu frame, and avoiding receiving the ultra-frame head and control message, i.e. avoiding time synchronization and frequency-offset correction. This invention reduces the average switch time into half ultra-frame time.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to a kind of channel switching method.
Background technology
Handheld digital TV adopts OFDM (Orthogonal Frequency Division Multiplex, OFDM) technology, OFDM is a kind of multi-carrier digital communications modulation technique, because OFDM has the higher availability of frequency spectrum and good anti-multipath interference performance, therefore, areas such as Europe, Australia are applied to OFDM the aspects such as broadband data communication, digital audio broadcasting, high definition digital television and WLAN (wireless local area network) of broadcast channel.OFDM also is counted as one of core technology of the 4th third-generation mobile communication.
The release of OFDM technology is in order to improve the spectrum of carrier utilance, to be characterized in that each subcarrier is mutually orthogonal in fact, and like this, the frequency spectrum after the modulation can be overlapped, thereby avoid the phase mutual interference between subcarrier.
Protection introducing at interval is one of characteristic of ofdm system technology, also is the reason place that can effectively resist the time delay expansion.Insert a segment protect before the symbol at interval, guaranteeing protection at interval under the prerequisite greater than the maximum delay expansion of wireless channel, can eliminate the interference that the multipath component of a symbol causes next symbol.
The Adaptive Modulation mechanism of OFDM can make different subcarriers different according to channel situation and noise background, uses different modulation systems.When channel condition was good, subcarrier can adopt the high modulation system of efficient; In the time of bad channel conditions, subcarrier can adopt the strong modulation system of antijamming capability.
OFDM requires between each subcarrier mutually orthogonal, can realize this modulation system well by adopting fast fourier transform, adopts the fast fourier transform mode can greatly reduce operand.
Because handheld digital TV has the demand of electrical energy saving, so program generally adopts time-multiplexed mode to transmit, like this, when channel switches, must know the positional information of the program that will switch.
At present, the channel switching method of handheld digital TV mainly contains two kinds:
Method one, based on the channel switching method of superframe.
The signal that MediaFLO (Media Forward Link Only, forward link media delivery) sends is formed superframe, and the structure of superframe as shown in Figure 1.
Among Fig. 1, each superframe comprises: 4 Frames, TDM (time division multiplexing) pilot tone and OIS (Overhead Information Symbols, overhead information symbol) information; Wherein, include wide area and local data in 4 Frames.The TDM pilot tone is mainly used to quick lock-on signal, obtains superframe-synchronized.The OIS information description position of data in superframe of each media business.
Using method one is being carried out channel when switching, handheld digital TV must be earlier superframe synchronously, then, from OIS information, take out the positional information that needs the program that switches, like this, average channel switching time is the time of a superframe, channel is long switching time.
Method two, based on the channel switching method of DVB-H (Digital Video Broadcasting-Handheld, digital video broadcasting-hand-held).
The physical frame structure of DVB-H as shown in Figure 2.Among Fig. 2, include n OFDM symbol in each program frame in the DVB-H physical frame, part bandwidth in the program frame is used for transmitting specially the TPS signaling of indication DVB-H business information and the PSI/SI (Program Specific Information/serviceInformation, programme information/business information) of indication programme information.Handheld digital TV carries out channel by the search programme information and switches.
DVB-H carries out channel when switching by search PSI/SI information, needs all programs of traversal need to determine the positional information of the program of switching, thereby causes channel long switching time.
Summary of the invention
The objective of the invention is to, a kind of channel switching method is provided, portable terminal has been avoided the synchronizing process of channel handoff procedure to superframe by the positional information of each program frame of storage, has realized shortening the channel purpose of switching time.
For achieving the above object, a kind of channel switching method provided by the invention comprises:
A, portable terminal are determined the relative position between the positional information of the positional information of program frame of current reception and target program frame according to the positional information of each program frame of its storage after receiving the channel switching signal;
B, portable terminal receive the program data of the target program frame in the superframe according to described relative position.
The superframe control information of the positional information of each program frame of mobile terminal stores from the superframe of portable terminal reception obtains among the described step a.
Described method also comprised before step a:
When mobile terminal-opening, carry out superframe time synchronized and frequency offset correction according to the superframe head;
Portable terminal obtains and stores the positional information of each program frame from the superframe control information.
The superframe that portable terminal receives comprises: superframe head, superframe control information and at least one program frame;
Be provided with superframe-synchronized and frequency offset correction information in the described superframe head, be provided with the positional information of each program frame in the described superframe control information, be provided with at least one program data in the described program frame.
Described superframe control information also comprises: system's frequency, Neighboring Cell List, each program frame length.
Also be provided with in the described program frame: program head and programme information; Described program head is used for Pgmtime and reaches frequency offset correction synchronously; Be provided with the coded modulation information of this program frame in the described programme information.
Also be provided with in the programme information of described program frame: the coded modulation information of the positional information of video-voice frequency flow and video-voice frequency flow.
Also be provided with in the programme information of described program frame: the indication information that receives next superframe.
Described method also comprises:
When portable terminal gets access to the indication information that receives next superframe from programme information, the superframe head that receives next superframe carries out superframe time synchronized and frequency offset correction, and obtains and upgrade the positional information of each program frame of its storage from described next superframe control information.
Described step b comprises:
Portable terminal is according to the program head of described relative position information receiving target program frame, and carries out the time synchronized and the frequency offset correction of target program frame;
The programme information of portable terminal receiving target program frame, and according to these programme information program receiving data.
Description by technique scheme as can be known, the present invention is stored in the portable terminal by the positional information with each program frame, make portable terminal can determine the time of receiving target program frame according to the positional information of its storage, avoided portable terminal at the channel handoff procedure to the superframe head of superframe and the receiving course of superframe control information, that is to say, avoided in the channel handoff procedure time synchronized to superframe, the frequency offset correction process, make portable terminal be directly switch to the target program, make average channel of the present invention shorten to half the superframe time switching time from current program; The position of each the program frame in the superframe of the present invention can not change usually, when the positional information of the program frame in the superframe changes, by in the programme information of program frame, carrying the indication information that receives next superframe, make portable terminal can know in the program receiving process that variation has taken place in the position of the program frame in the superframe, portable terminal receives the superframe head of next superframe according to this indication information, and from the superframe control information, obtain the positional information of program frame, positional information with each program frame of upgrading its storage, guaranteed the consistency of the positional information of the positional information of program frame of its storage and each the program frame in the superframe, and, the energy consumption of having saved portable terminal; Thereby realized shortening the channel purpose of switching time by technical scheme provided by the invention.
Description of drawings
Fig. 1 is the superframe structure schematic diagram based on MediaFLO of the prior art;
Fig. 2 is the superframe structure schematic diagram based on DVB-H of the prior art;
Fig. 3 is the superframe structure schematic diagram of embodiments of the invention;
Fig. 4 is the frequency switching flow figure of embodiments of the invention.
Embodiment
Core of the present invention is: portable terminal is after receiving the channel switching signal, determine the relative position between the positional information of the positional information of program frame of current reception and target program frame according to the positional information of each program frame of its storage, portable terminal receives the program data of the target program frame in the superframe according to described relative position.
Based on core concept of the present invention technical scheme provided by the invention is further described below.
Store the positional information of each the program frame in the superframe in the portable terminal of the present invention, like this, in the channel handoff procedure, portable terminal can be determined relative position between the positional information of the positional information of program frame of its current reception and target program frame according to the positional information of each program frame of its storage, avoided obtaining the process of the positional information of target program frame, thereby shortened the time that channel switches by superframe-synchronized.
The positional information of each program frame of storing in the portable terminal can be obtained from the superframe of its reception, as portable terminal in when start, at first carry out superframe-synchronized and frequency offset correction, then, obtain the positional information of each program frame from the superframe control information, the positional information of each program frame that portable terminal obtains can be stored as the program location information table.
The positional information of each program frame of storing in the program location information table in the portable terminal need be along with the variation of the positional information of each the program frame in the superframe and is changed.Because the positional information of each the program frame in the superframe can often not change usually, so the positional information of each program frame of storing in the portable terminal can often not change.When the positional information of the program frame in superframe changes, can in the program frame of superframe, carry the indication information that receives next superframe, like this, portable terminal when receiving the indication information of next superframe, receives the superframe head of next superframe in the program receiving process, and carry out superframe-synchronized and frequency offset correction, then, from the superframe control information, obtain the positional information of each program frame, the updating location information program location information table of each program frame that the portable terminal utilization is obtained.
Superframe structure provided by the invention as shown in Figure 3.
Among Fig. 3, superframe of the present invention comprises: superframe head, superframe control information and M program frame; Wherein, include in each program frame: program head, programme information and at least one program data.Be time-multiplexed between the program frame.
Be provided with superframe time synchronized and frequency offset correction information in the superframe head.Be provided with the positional information of each program frame in the superframe control information, also can be provided with information such as system's frequency, Neighboring Cell List, program length in the superframe control information.
Be provided with the time synchronized and the frequency offset correction information of program in the program head, the program head is used for portable terminal and carries out the synchronous fast of program.Be provided with the coded modulation information of program in the programme information, separately transmit, also will further comprise the positional information of video-voice frequency flow and the coded modulation information of video-voice frequency flow in the programme information if audio frequency is looked in system's support.Because the superframe control information in the superframe, program head, the programme information in each program frame may not be frequent change, in order to save the electrical source consumption of portable terminal, can carry the indication information that receives next superframe in the programme information, receive the superframe head of next superframe with indicating mobile terminal.
Below to portable terminal from start program receiving data, carry out the process that channel switches again and be described.
Set portable terminal such as hand held television and at first start shooting, program receiving A then, switches to program B from program A, and promptly program A is current program, and program B is the target program, the detailed process that channel switches as shown in Figure 4:
Among Fig. 4,, receive the superframe head of superframe, carry out the time synchronized and the frequency offset correction of superframe in step 1, hand held television start.
To step 2, hand held television receive and the demodulation superframe in the superframe control information, obtain the positional information of each program frame, and the positional information of each program frame be stored in the program location information table.
To step 3, hand held television program frame according to the positional information program receiving A of program A in the location information table.
Carry out the time synchronized and the frequency offset correction of the program frame of program A according to the program head of program A to step 4, hand held television.
Programme information to step 5, hand held television program receiving A.
To step 6, hand held television program data according to the programme information program receiving A of program A, and broadcast program A.
To step 7, in the process of broadcast program A, hand held television receives channel change command, and this channel change command need switch to program A program B.
Arrive step 8, hand held television according to the relative position between program location information table calculating program A and the program B.
Determine the synchronous time started of program B according to above-mentioned relative position information to step 9, hand held television.
To step 10, hand held television program head, carry out time synchronized and the frequency offset correction of program B according to the program head of program B according to the synchronous time started program receiving B of program B.
Programme information to step 11, hand held television program receiving B.
To step 12, hand held television program data according to the programme information program receiving B of program B, and broadcast program B.
From technique scheme as can be seen, stored the positional information of each program frame in the portable terminal among the present invention, like this, in the channel handoff procedure, portable terminal can be determined the time of receiving target program according to the positional information of current program and target program, the superframe head of superframe and the process of superframe control information have been avoided receiving, that is to say, avoided time synchronized and the frequency offset correction process of portable terminal to superframe, make average channel of the present invention shorten to the superframe time half switching time, thereby make portable terminal can be directly switch to the target program.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (10)
1, a kind of channel switching method is characterized in that, described method comprises:
A, portable terminal are determined the relative position between the positional information of the positional information of program frame of current reception and target program frame according to the positional information of each program frame of its storage after receiving the channel switching signal;
B, portable terminal receive the program data of the target program frame in the superframe according to described relative position.
2, a kind of channel switching method as claimed in claim 1 is characterized in that, the superframe control information of the positional information of each program frame of mobile terminal stores from the superframe of portable terminal reception obtains among the described step a.
3, a kind of channel switching method as claimed in claim 2 is characterized in that, described method also comprised before step a:
When mobile terminal-opening, carry out superframe time synchronized and frequency offset correction according to the superframe head;
Portable terminal obtains and stores the positional information of each program frame from the superframe control information.
4, a kind of channel switching method as claimed in claim 2 is characterized in that, the superframe that portable terminal receives comprises: superframe head, superframe control information and at least one program frame;
Be provided with superframe-synchronized and frequency offset correction information in the described superframe head, be provided with the positional information of each program frame in the described superframe control information, be provided with at least one program data in the described program frame.
5, a kind of channel switching method as claimed in claim 4 is characterized in that, described superframe control information also comprises: system's frequency, Neighboring Cell List, each program frame length.
6, a kind of channel switching method as claimed in claim 4 is characterized in that, also is provided with in the described program frame: program head and programme information; Described program head is used for Pgmtime and reaches frequency offset correction synchronously; Be provided with the coded modulation information of this program frame in the described programme information.
7, a kind of channel switching method as claimed in claim 6 is characterized in that, also is provided with in the programme information of described program frame: the coded modulation information of the positional information of video-voice frequency flow and video-voice frequency flow.
8, a kind of channel switching method as claimed in claim 6 is characterized in that, also is provided with in the programme information of described program frame: the indication information that receives next superframe.
9, a kind of channel switching method as claimed in claim 8 is characterized in that, described method also comprises:
When portable terminal gets access to the indication information that receives next superframe from programme information, the superframe head that receives next superframe carries out superframe time synchronized and frequency offset correction, and obtains and upgrade the positional information of each program frame of its storage from described next superframe control information.
10, a kind of channel switching method as claimed in claim 6 is characterized in that, described step b comprises:
Portable terminal is according to the program head of described relative position information receiving target program frame, and carries out the time synchronized and the frequency offset correction of target program frame;
The programme information of portable terminal receiving target program frame, and according to these programme information program receiving data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100017455A CN101009823A (en) | 2006-01-23 | 2006-01-23 | A channel switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100017455A CN101009823A (en) | 2006-01-23 | 2006-01-23 | A channel switching method |
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|---|---|
| CN101009823A true CN101009823A (en) | 2007-08-01 |
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| CNA2006100017455A Pending CN101009823A (en) | 2006-01-23 | 2006-01-23 | A channel switching method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267266B (en) * | 2008-04-30 | 2010-06-02 | 中兴通讯股份有限公司 | A terminal for switch to history channel and its switching method |
| CN101827395A (en) * | 2009-03-06 | 2010-09-08 | 中国移动通信集团公司 | Information updating method of LTE (Long Term Evolution) system, base station, user terminal and system |
| CN101951483A (en) * | 2010-09-19 | 2011-01-19 | 中兴通讯股份有限公司 | Television channel switching method for mobile terminal and mobile terminal |
| CN102752803A (en) * | 2011-04-19 | 2012-10-24 | 普天信息技术研究院有限公司 | Control information and service information transmission method |
-
2006
- 2006-01-23 CN CNA2006100017455A patent/CN101009823A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267266B (en) * | 2008-04-30 | 2010-06-02 | 中兴通讯股份有限公司 | A terminal for switch to history channel and its switching method |
| CN101827395A (en) * | 2009-03-06 | 2010-09-08 | 中国移动通信集团公司 | Information updating method of LTE (Long Term Evolution) system, base station, user terminal and system |
| CN101951483A (en) * | 2010-09-19 | 2011-01-19 | 中兴通讯股份有限公司 | Television channel switching method for mobile terminal and mobile terminal |
| CN101951483B (en) * | 2010-09-19 | 2016-03-30 | 中兴通讯股份有限公司 | The changing method of the television channel of mobile terminal and mobile terminal |
| CN102752803A (en) * | 2011-04-19 | 2012-10-24 | 普天信息技术研究院有限公司 | Control information and service information transmission method |
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