3G media stream cross-layer rate control method based on channel measurement

A channel measurement and rate control technology, applied in the direction of error prevention/detection, image communication, electrical components, etc. using the return channel, which can solve problems such as reduced transmission rate, performance degradation, and low network utilization.

Active Publication Date: 2014-03-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] In the wireless network environment, due to the fast time-varying nature of the wireless channel and the high bit error rate, the packet loss caused by wireless errors may account for a large proportion of the total packet loss. The TFRC protocol designed based on the wired network cannot distinguish the cause of packet loss. The wireless packet loss will be judged as congestion packet loss, thereby excessively reducing the sending r

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  • 3G media stream cross-layer rate control method based on channel measurement
  • 3G media stream cross-layer rate control method based on channel measurement
  • 3G media stream cross-layer rate control method based on channel measurement

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[0054] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0055] Such as figure 1 As shown, a kind of 3G media stream cross-layer rate control method based on channel measurement proposed by the present invention, the method includes: performing channel quality estimation at the user terminal, performing packet loss type discrimination according to channel quality, and packet loss according to the identified congestion The event calculates the average congestion packet loss rate, and at the same time uses the RLC layer to eliminate the impact of the ARQ mechanism on the delay measurement, and then analyze the change trend of the delay. The server receives the channel quality and delay variation trend information fed back by the user terminal, and adjusts the transmission rate based on the TFRC steady-state rate formula. The main specific steps are:

[0056] Step 1, the user terminal performs channel quality estimation: th...

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Abstract

The invention discloses a 3G media stream cross-layer rate control method based on channel measurement. According to the method, wireless channel quality is estimated through ARQ message of an RLC layer for transmission characteristics of a 3G/UMTS air interface so as to distinguish packet loss types, and a server will be used to judge the network congestion situation and adjust the sending rate according to the channel quality which is fed back and the time delay change trend by means of the time delay measurement error brought to the transmission layer caused by the RLC layer eliminating ARQ mechanism, the packet loss rate and the throughput performance have substantial characteristics and significant improvements compared with the prior art, so the method can be used to ensure that end-to-end QoS requirements of media services can be fully satisfied by the rate control.

Description

technical field [0001] The invention relates to the technical field of computer wireless communication networks, in particular to a method for controlling the cross-layer rate of 3G media streams based on channel measurement. Background technique [0002] As a cellular mobile communication technology that supports high-speed data transmission, 3G has been widely valued. In addition to supporting traditional voice services and low-speed data services, 3G is also designed to support a large number of different services, such as video telephony, video conferencing, and various multimedia services. These services have higher requirements on QoS. In order to meet the QoS requirements of emerging services, an effective end-to-end rate control method is necessary. [0003] In the wireless network environment, due to the fast time-varying nature of the wireless channel and the high bit error rate, the packet loss caused by wireless errors may account for a large proportion of the to...

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Application Information

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IPC IPC(8): H04N21/647H04L29/08H04L1/18
Inventor 董育宁彭宇珏张健
Owner NANJING UNIV OF POSTS & TELECOMM
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