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Method and system for realizing IP data package transmission based on CMMB channel

An IP data packet and channel technology, applied in the field of broadcast communication, can solve the problems of undefined correspondence, undefined IP data packet arrangement, synchronization method, and recovery verification method, etc., so as to reduce data redundancy and improve Versatility, effect of improving transmission efficiency

Inactive Publication Date: 2012-01-04
ACAD OF BROADCASTING SCI SARFT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Existing standards and specifications do not define the arrangement, synchronization and recovery of IP data packets in data segments when IP data packets are encapsulated into data segments of multiplexed subframes for transmission.
At the same time, the existing standards and specifications do not define how to notify the receiving end of the correspondence between the IP address and port number of the multiplexing frame and IP data packet at the multiplexing layer

Method used

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  • Method and system for realizing IP data package transmission based on CMMB channel
  • Method and system for realizing IP data package transmission based on CMMB channel
  • Method and system for realizing IP data package transmission based on CMMB channel

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Embodiment Construction

[0044] The purpose of the present invention is based on the multiplexing structure defined in the prior art, using simplified multiplexing frame headers, simplified multiplexing subframe headers, modifying data segment headers, and defining IP mapping tables, so that terminals can quickly resume multiplexing The frame header, multiplexing subframe, data segment and IP packet are used for data broadcasting of the IP packet.

[0045] see image 3 , this figure is the flow chart of the method for realizing IP data transparent transmission based on CMMB channel of the present invention, and its main realization process is:

[0046] Step 10. The sending end adds a synchronization header before each IP data packet to be sent. Adding a synchronization header in front of the IP data packet can improve the system's rapid recovery capability and anti-interference ability. The synchronization header includes 4 bytes of specific value synchronization byte, IP packet length and CRC32 chec...

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Abstract

The invention discloses a method and a system for realizing IP data package transmission based on a CMMB channel. The system comprises a data transmitting terminal and a data receiving terminal. The method comprises the steps that: the data transmitting terminal adds a synchronous head in the front of an IP data packet to be transmitted; the IP data packet added with the synchronous head is put ina data segment, packaged in a multiplex sub-frame and then packaged in an IP packet multiplex frame and synchronously generates an IP packet mapping table which is packaged into a control informationmultiplex frame; the data transmitting terminal broadcasts and transmits a CMMB channel frame formed by the IP packet multiplex frame and the control information multiplex frame after the CMMB channel frame is modulated; the data receiving terminal modules the received CMMB channel frame, extracts the IP packet mapping table, resolves the multiplex sub-frame from the IP packet multiplex frame according to the information in the IP packet mapping table, extracts the data segment from the multiplex sub-frame and recovers the IP data packet according to the synchronous head in the data segment.The invention can lower the redundancy rate of data and the complexity of system realization.

Description

technical field [0001] The present invention relates to the field of broadcast communication, in particular to a method and system for realizing IP data packet transmission based on a CMMB (China Mobile Multimedia Broadcasting, China Mobile Multimedia Broadcasting) channel. Background technique [0002] The radio, film and television industry standard CMMB channel modulation specification GY / T 220.1 defines that CMMB adopts OFDM (Orthogonal Frequency Division Multiplexing) modulation technology for channel transmission. The CMMB system divides the transmitted data into CMMB channel frames in units of one second, and one second is a CMMB channel frame. [0003] see figure 1 , this figure is a frame structure diagram of a CMMB channel frame in the prior art, as can be seen from the figure, a CMMB channel frame is divided into 40 time slots, each time slot is 25ms, wherein time slot 0 is used to transmit multiplexing frame control information That is, the control information ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L29/06H04H20/86
Inventor 朱佩江丁森华尹亚光夏勇葛兵
Owner ACAD OF BROADCASTING SCI SARFT