Audio/video transmission method on basis of 3G network

A transmission method and 3G network technology, applied in the field of real-time and stability improvement, can solve problems such as high delay rate and high bit error rate, achieve reliable and stable service, and reduce retransmission effects

Active Publication Date: 2012-11-21
深圳市时代经纬科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical deficiencies of high bit error rate and high delay

Method used

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  • Audio/video transmission method on basis of 3G network
  • Audio/video transmission method on basis of 3G network
  • Audio/video transmission method on basis of 3G network

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Embodiment Construction

[0019] The method of the present invention will be further described below in conjunction with the accompanying drawings and preferred specific embodiments of the present invention.

[0020] The invention includes a scheduling processing method before audio and video transmission using the UDP protocol at the client end and a server end, a congestion control processing method during the transmission process, and a fast retransmission processing method after packet loss. The client mentioned here mainly refers to mobile terminals such as mobile terminals, handheld terminals, and mobile communication devices that adopt 3G wireless networking.

[0021] Referring to Figure 1, the scheduling processing method is a scheduling algorithm based on the UDP protocol for audio and video transmission. Different servers are selected according to network conditions, and it is a mechanism for real-time audio and video communication between two points or one-to-multipoint. For example: after t...

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Abstract

The invention discloses an audio/video transmission method on the basis of a 3G (3rd Generation) network, relates to the technical field of the 3G network audio/video transmission method and overcomes the technical defects of high error rate and high delay rate of an existing TCP (Transmission Control Protocol) communication protocol in the transmission process. A client and a server carry out audio/video transmission by utilizing a UDP (User Datagram Protocol) protocol. The audio/video transmission method is characterized in that a sliding window mechanism is adopted and comprises the following steps: in case of the change of the ACK (Acknowledgement) recurrence frequency, forecasting that a congestion criticality is reached and entering a congestion avoidance phase in advance before a packet is lost; and after entering the congestion avoidance phase, adopting a formula of WND=BEW*RTT to calculate an approximately same theoretical window, ensuring a sending window not smaller than the theoretical window and controlling transmit flow to carry out congestion control. In the step of entering the congestion avoidance phase in advance, the congestion control is mainly carried out by measuring RTT (Round-TripTime) at both ends, carrying out conversion on the channel capacity and controlling the transmit flow. The audio/video quality is obviously improved; the delay time is shortened into 2 seconds from the maximum delay seconds; and the audio/video quality is obviously improved.

Description

technical field [0001] The present invention relates to the technical field of audio and video transmission methods in 3G networks, in particular to the improvement of real-time performance and stability of audio and video transmission using UDP protocol (User Data Protocol, User Datagram Protocol). Background technique [0002] Communication and the Internet and other occasions that require data transmission, the Transmission Control Protocol (TCP) is commonly used, which can be used in the field of wired and wireless communications, between personal computers (PCs) or handheld terminals, mobile communication devices through wired or wireless networks. communication. [0003] For example, data exchange is performed between a mobile terminal and a PC, and between a PC and a PC. However, the congestion control mechanism in the TCP communication protocol used in traditional networks is based on the fact that congestion is the cause of network packet loss, and in order to be c...

Claims

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Application Information

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IPC IPC(8): H04N21/2381H04N21/2662H04N21/643H04W28/02
Inventor 李良刚马斌
Owner 深圳市时代经纬科技有限公司
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