System and method for realizing AP uplink tcp service flow balance in wlan

Abstract

The invention relates to a system and a method for realizing equalization of AP uplink TCP service flows in a WLAN, and belongs to the technical field of communication. Including the following steps: a) the STA statistics module performs real-time statistics on the number of TCP service flows connected to the AP, which provides an important basis for the calculation of the balance window value; b) the channel busy detection module based on the hardware driver layer detects the occupancy of the channel in real time , when it reaches the defined threshold, it is fed back to the TCP receiving window modification module through a feedback mechanism; c) the TCP window modification module calculates each The optimal TCP receiving window value of each TCP flow is determined, and then the receiving window of the TCP flow is modified through the TCP receiving window modification module to realize the control of the TCP rate. This method improves the overall throughput of the system.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for solving the problem of intensified collision of uplink TCP service data and decreased throughput in WLAN. Background technique [0002] With the rapid development of Wireless Local Area Network (WLAN), user demands and services increase rapidly, among which the Transmission Control Protocol (TCP) service occupies a dominant position. TCP is a data transmission protocol for reliable communication between data communications. In a wired environment, TCP provides a powerful congestion control algorithm to share bandwidth during TCP communication, effectively avoiding network congestion. However, in complex WLAN environment applications, TCP services are often unsuitable. Since WLAN system access control uses the DCF protocol based on Carrier Sense Multipoint Access / Collision Avoidance (CSMA / CA) to achieve multipoint random access, in In the TCP uplink ...

AI Technical Summary

Problems solved by technology

However, in complex WLAN environment applications, TCP services are often unsuitable. Since WLAN system access control uses the DCF protocol based on Carrier Sense Multipoint Access / Collision Avoidance (CSMA / CA) to achieve multipoint random access, in In the TCP uplink with a large number of terminals, each STA transmits a large number of data packets. Intense competition of wireless channels leads to fierce data packet collisions, resulting in low utilization of wireless channels and a decrease in overall system throughput. Experience makes a big difference

[0003] A popular research method for this problem: one is to control the transport layer of the AP based on the characteristics of the TCP protocol to balance the TCP service flow, but this method has a certain impact on the throughput.

The other is a solution based on PCF and IEEE802.11e, but it cannot well support existing APs and terminals

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