Real-time multimedia transmission rate control mechanism in wireless network
A transmission rate, wireless network technology, applied in wireless communication, network traffic/resource management, electrical components, etc., can solve problems such as inter-symbol interference, channel bandwidth utilization reduction, packet loss, etc.
Active Publication Date: 2014-10-22
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
In a wireless environment, in addition to the possible impact of network congestion, packet loss may also be caused by wireless links due to multipath effects, intersymbol interference, etc.
The control protocol simply attributes the cause of packet loss to network congestion, that is, when packet loss occurs, the control mechanism will judge the network status as congestion. Although the sending rate is reduced, the packet loss situation has not been resolved as expected. The packet still exists, and the algorithm will judge that "the network is in a congested state", thus entering a vicious circle, the sending end will no longer increase the sending rate, the sending rate can only be maintained at a low level, the network throughput is greatly reduced, and the bandwidth utilization of the channel rate also dropped
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[0043] The working mechanism and specific implementation steps of the method of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0044] The present invention utilizes the technology of how TCP Veno distinguishes between packet loss due to congestion and packet loss due to wireless link errors in a wireless network environment, obtains useful network status information based on RTCP feedback messages, and applies a wide range of TFRC rate control mechanisms to the transmission of real-time multimedia in wired networks The application in the wireless network environment is improved to increase its throughput under the wireless network, making it more suitable for the situation of the wireless network.
[0045] The specific embodiment of the present invention is:
[0046]1) The sender uses the RTP protocol to send multimedia data to the receiver, and at the same time sends SR messages (a kind of RTCP message) to the receiver...
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The invention discloses a real-time multimedia transmission rate control mechanism in a wireless network. By using a method used by TCP Veno for distinguishing congestion packet loss and wireless links error packet loss in a wireless network, a TFRC algorithm in a wired network environment is improved and a W-TFRC algorithm based on RTCP message feedback in a wireless network environment is provided. After a packet loss reason is distinguished, influence, of wireless packet loss, on the rate control mechanism is eliminated. Specifically, recalculation is performed in order to obtain the loss event rate of congestion packet loss rather than the loss event rate of total packet loss. The real-time multimedia transmission rate control mechanism in a wireless network better solves a problem that transmit rate is continuously maintained at a low level and cannot be increased because of a misjudged packet loss reason when a control algorithm of a wired network is applied to a wireless network, and has good performance in aspects of TCP friendliness, fairness, robustness, throughput, and packet loss.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a real-time multimedia transmission rate control mechanism in a wireless network. Background technique [0002] Developing real-time multimedia services in the wireless network environment has become a hot spot in the industry. The development of real-time multimedia services under traditional wired Internet conditions has made great progress, but wireless networks are different from wired networks after all. Real-time multimedia transmission technologies that perform well under wired network conditions may encounter challenges in the context of wireless networks. [0003] The TFRC (TCP Friendly Rate Control) protocol was originally a control technology designed for real-time transmission of wired Internet multimedia. It uses network feedback parameters to evaluate network conditions, and one of the important parameters is information related to packet loss. In a ...
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IPC IPC(8): H04W28/22
Inventor 王玉峰付鹏
Owner NANJING UNIV OF POSTS & TELECOMM