Data packet packing, transmitting and receiving method for mobile multimedia broadcast system

Abstract

The invention provides a method for encapsulating, transmitting and receiving a data packet for a mobile multimedia broadcasting system. The encapsulating method comprises the following steps: A, encapsulating a multiplex packet identifier on an initial position of a radio broadcasting multiplex head; B, generating coding system information according to a network layer data packet to be transmitted, and encapsulating the coding system information in the radio broadcasting multiplex head; and C, generating a radio broadcasting multiplex packet after the network layer data packet to be transmitted is encapsulated in the radio broadcasting multiplex head, wherein the coding system information contains length and an environment identifier of the network layer data packet to be transmitted; the radio broadcasting multiplex head contains type identification of the network layer data packet; and types of the network layer data packet contain a compressed IP data packet and a FULL_HEADER packet. The method for encapsulating, transmitting and receiving the data packet can improve reliability and fault-tolerance performance of transmission of the compressed IP data packet and a session environment data packet in the radio broadcasting system.

Description

technical field [0001] The invention relates to a data packet encapsulation, sending and receiving method of mobile multimedia broadcasting. Background technique [0002] In recent years, digital wireless mobile multimedia broadcasting technologies and standards have developed rapidly, such as DVB-H (Digital Video Broadcast Handheld, digital video broadcasting handheld reception) in Europe, and MediaFLO (Media Forward Link Only, media single forward link) in the United States. And China's CMMB (China Mobile Multimedia Broadcasting, mobile multimedia broadcasting) and so on. [0003] The mobile multimedia broadcasting system can provide video and audio services for mobile terminal users, and can also provide a variety of data broadcasting services, such as video clip files based on file download mode, MP3 (MPEG Audio Layer 3, Motion Picture Experts Group Audio Layer 3) Songs, services based on real-time data streams, such as traffic information, and various services based on...

AI Technical Summary

Problems solved by technology

[0018] On the one hand, the IP data packet and the above-mentioned session environment data packet are not fixed in length, and there is no header identification that is clearly different from the data part, so it is difficult for the receiving end to accurately identify the beginning of the IP data packet;

[0019] On the other hand, since the CMMB broadcast channel is a one-way wireless transmission channel, the wireless channel conditions are more complicated, there may be a high bit error rate, and the receiving end may receive wrong data

[0020] Due to the above two problems, if an error occurs in the header part of an IP data packet during the transmission of the IP data packet, especially in the length field, it will cause all subsequent multiplexed data received by the terminal to be lost. Confused, subsequent IP packets may not be parsed

Similarly, if there is an error in the above-mentioned session environment data packet, it may cause the receiving end to be unable to correctly receive the data packet and decompress the IP header for a long time

[0021] That is to say, when the existing IP packet encapsulation and multiplexing methods, as well as the IP header compression and decompression methods are applied to the wireless broadcast channel, there are problems of low fault tolerance and poor reliability.

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