Method for transferring the program data stream in the mobile video broadcast system
A technology of broadcasting system and mobile video, applied in parts of TV system, transmission of pulse modulated TV signal, parts of color TV, etc., can solve problems such as large scheduling granularity, occupation of data subcarriers, and inability to realize scheduling, etc., to achieve The effect of flexible scheduling, improved utilization, and improved capacity
Inactive Publication Date: 2007-10-17
HUAWEI TECH CO LTD
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Problems solved by technology
For the terminal, on the one hand, when receiving the required program signal, it must wait until the source is decoded to find the starting position of the required program data BURST. There is no clear time and frequency boundary for BURST between different programs, resulting in reception The program synchronization time and program switching time are long; on the other hand, all data subcarriers are completely occupied by a program data, resulting in a large scheduling granularity, which cannot realize flexible scheduling and improve the utilization efficiency of frequency and time resources
Furthermore, frequency selective fading can only be countered by forward error correction coding and equalization techniques in this case
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[0030] The present invention aims at improving the capability of resisting frequency-selective channels and improving scheduling flexibility in mobile video broadcasting, assigning BURST of different program data to different sub-carrier groups for transmission, and adjusting the corresponding logic of program data according to a certain algorithm The mapping relationship between channels and subcarrier groups prevents the data of the same program from being on subcarriers with large fading for a long time, thereby improving the system's ability to resist frequency selective channels.
[0031] Fig. 3 is a flow chart of the method for transmitting program data streams in the mobile video broadcasting system of the present invention. Usually, the mobile video broadcasting system broadcasts multiple groups of video programs, adopts time slicing technology, that is, transmits the data stream of the program in BURST mode, and logically corresponds the data stream of each group of pr...
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The invention relates to a method of transmitting program data streams in a mobile video broadcast system, the system broadcasts multiple groups of video programs, wherein each group of program corresponds to a logic channel, and the method comprises allocating the groups of programs to different sub-carrier groups to transmit, continuously regulating mapping relations between logic channels corresponding to the program data and the sub-carrier groups, and keeping synchronization of mapping relations between an emitter and a receiver. The method of the invention can prevent the data of a same program from being on a frequency band with big fading for a long time, thereby improving the capability of the system to resist frequency selective channels, furthermore, improving the scheduling flexibility and utilization ratios of frequencies and time resource due to different program data being allocated to different sub-carrier groups.
Description
technical field [0001] The present invention relates to mobile video broadcasting, and more specifically, to a method for transmitting program data streams in a mobile video broadcasting system. Background technique [0002] After more than ten years of development, the research and application of digital TV broadcasting technology has achieved a lot of results, from satellite digital TV (represented by DVB-S, DVB-S2 in Europe, S-DMB in South Korea and Japan), cable digital TV TV (represented by DVB-C in Europe), terrestrial digital TV (represented by DVB-T in Europe, ATSC in the United States, IDSB-T in Japan, DMB-T in China, etc.) to mobile video broadcasting (represented by DVB-T in Europe DVB-H, represented by Qualcomm's FLO), has been widely used in many countries and regions, and has achieved fruitful social and economic benefits. [0003] The mobile video broadcasting technology combining digital TV and mobile communication can meet the needs of people to receive TV ...
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Login to View More IPC IPC(8): H04N7/06H04N7/24H04N5/04
Inventor 吕林军吴涛张毅
Owner HUAWEI TECH CO LTD