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Sending rate adjustment method and device based on wireless channel feedback

A transmission rate and wireless channel technology, applied in the field of communication, can solve the problems of mismatch between transmission behavior and channel characteristics, congestion performance, waste of air interface resources, etc., to avoid search jitter, improve user experience, and avoid queue congestion.

Active Publication Date: 2014-12-24
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the transport layer, RTT (Round Trip Time, two-way round-trip time) and the transmission rate change, and there is a mismatch between the sending behavior and the channel characteristics, and because TCP relies on ACK to detect packet loss or delay, the sending behavior adjustment of the transport layer and the channel There is a time difference in adjustment, which can easily cause congestion and performance loss
[0004] When switching from low rate to high rate mode, the channel utilization rate is low due to the TCP connection conservatively probing the upper limit of channel transmission in the congestion avoidance stage; when switching from high rate to low rate mode, the TCP connection sending window is not adjusted in time. Congestion, accompanied by retransmission of a large number of lost packets
[0005] To sum up, in the existing technology, on the one hand, it may cause false triggering of network congestion, causing unnecessary frequent jitter in the actual sending rate; vibration, resulting in a great waste of the originally rare air interface resources

Method used

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  • Sending rate adjustment method and device based on wireless channel feedback
  • Sending rate adjustment method and device based on wireless channel feedback
  • Sending rate adjustment method and device based on wireless channel feedback

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Embodiment 1

[0020] Aiming at the problems existing in the prior art, Embodiment 1 of the present invention provides a transmission rate adjustment method based on wireless channel feedback, to figure 1 It is a schematic diagram of an application scenario of an embodiment of the present invention, and the method can be applied to a network including a terminal device (such as a mobile terminal), a base station device, a TCP connection proxy entity, a gateway device (such as a packet domain gateway) and a server. Wherein, the TCP connection proxy entity can be integrated on the current base station equipment or gateway equipment, in figure 1 Take the integration of the TCP connection proxy entity on the gateway device as an example for illustration. In addition, the terminal device corresponds to a browser that needs to access the server, and the server is a corresponding service site, and corresponds to WEB (Internet).

[0021] In the above application scenarios, such as figure 2 As sho...

Embodiment 2

[0055] Based on the same inventive concept as the above-mentioned method, a transmission control protocol TCP connection proxy entity is also provided in the embodiment of the present invention, such as image 3 As shown, the TCP connection proxy entity includes:

[0056] An acquisition module 11, configured to acquire wireless channel state information;

[0057] The processing module 12 is used to adjust the overtime retransmission time parameter RTO according to the wireless channel state information, reduce the data transmission rate of the TCP connection proxy entity, and notify the device sending data to the TCP connection proxy entity to reduce the data transmission rate.

[0058]In the embodiment of the present invention, the wireless channel state information is specifically the air interface resource scheduling result and the modulation and coding mode; or, the wireless channel state information is specifically the data transmission bit rate determined based on the ai...

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Abstract

The invention discloses a sending rate adjustment method and device based on wireless channel feedback. The sending rate adjustment method comprises the steps that a TCP connection agent entity acquires wireless channel state information; the TCP connection agent entity adjusts retransmission time out (RTO) parameters according to the wireless channel state information, the data sending rate of the TCP connection agent entity is reduced, and a device sending data to the TCP connection agent entity is notified to reduce the data sending rate. According to the sending rate adjustment method and device based on wireless channel feedback, the TCP connection agent entity can reasonably adjust the sending rate according to the wireless channel state information, channel resources obtained after modulation modes are switched can be efficiently utilized in time, and waste of radio resources can be avoided. Furthermore, blind search jitter of TCP congestion control caused by unstable wireless channels can be avoided, RTO, queue congestion and the like are avoided, and therefore wireless data service user experience is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for adjusting transmission rate based on wireless channel feedback. Background technique [0002] TCP (Transmission Control Protocol, Transmission Control Protocol) provides a connection-oriented and reliable byte stream to the application layer through mechanisms such as data segmentation, sending number, receiving confirmation, timeout retransmission, out-of-order reassembly, discarding duplicate packets, and flow control. service, and use confirmation and timeout retransmission mechanisms to ensure reliable data transmission. Furthermore, when there are too many packets in the network, the network will be congested, and the congestion control of TCP mainly depends on the congestion window (cwnd), and the receiving window (rwnd) announced by the other end is used for flow control. Among them, the size of the window value represents the larges...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18H04W28/04
Inventor 邓灵莉房雅丁陆璐侯志强
Owner CHINA MOBILE COMM GRP CO LTD
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