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Access point (AP) scheduling method for improving short-term fairness of transmission control protocol (TCP) in wireless local area network (WLAN)

A scheduling method and access point technology, applied in electrical components, wireless communication, etc., can solve problems such as unfairness

Inactive Publication Date: 2011-08-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is the transmission of long-term TCP flows suppressing short-term TCP flows, resulting in short-term unfairness

Method used

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  • Access point (AP) scheduling method for improving short-term fairness of transmission control protocol (TCP) in wireless local area network (WLAN)
  • Access point (AP) scheduling method for improving short-term fairness of transmission control protocol (TCP) in wireless local area network (WLAN)
  • Access point (AP) scheduling method for improving short-term fairness of transmission control protocol (TCP) in wireless local area network (WLAN)

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Embodiment Construction

[0018] figure 1 This is the basic application scenario of this optimization method. The wired node W1 is connected to the access point AP through a wired connection, and the wireless nodes n0 and n1 are connected to the AP through a wireless connection. W0 transmits long-term TCP flow to n1, and W1 transmits short-term TCP flow to n0. The wired link bandwidth is set wide enough to ensure that no data packets are lost on the wired link.

[0019] A receiving queue is allocated for each type of TCP flow data in the AP, and a timer is set for each queue, and its initial state is zero.

[0020] First, the incoming data packets are queued in the AP. When the AP receives the data packet, according to the destination address of the data packet, through the conversion of the address to the queue number, the packets enter different queues respectively. When a packet enters the queue, first judge the status of the queue. If the queue has reached the maximum length, the packet is dis...

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Abstract

The invention belongs to the technical field of wireless network communications and relates to an access point (AP) scheduling method for improving the short-term fairness of a transmission control protocol (TCP) in a wireless local area network (WLAN). The method is characterized in that two queues are designed in an AP and used for receiving data packets of long-term TCP streams and data packets of short-term TCP streams respectively as well as provided with a timer respectively; after the AP receives the data packets, the AP determines which queue the data packets belong to in accordance with the destination addresses carried by the data packets and then inspects the state of the queue into which the data packets enter; if the state is null, the timer of the existing queue is started, and values of the timer are recorded; if the state is not null, the data packets enter into the queue directly; and if the queue is full, a packet loss algorithm is executed. The priority levels of scheduling and forwarding the data packets are determined in accordance with the timers. The data packets at the head of the queue of which the timer is the longest in time are forwarded preferentially.The method can be used to improve the short-term fairness of the TCP in the WLAN, increase transmission data volume and transmission rate of the short-term TCP streams, and shorten the response time for sending data groupings by the short-term TCP streams.

Description

technical field [0001] The invention relates to a priority scheduling algorithm, which is used to improve short-term fairness of TCP in WLAN, can increase the transmission data volume and transmission rate of short-term TCP flow, and shorten the response time of sending data packets by short-term TCP flow. Background technique [0002] The current communication protocol used in wireless networks is mainly the IEEE 802.11 standard. The 802.11 protocol only involves the MAC layer and the physical layer, and does not involve the modification of the upper layer protocol, so the protocols above the IP layer still use the traditional TCP / IP model. From the perspective of network layering, such a regulation is reasonable, but it will also have some adverse effects on the performance of upper-layer services. TCP unfairness is one of many problems. The fairness of TCP is very important in a wireless network, which seriously affects the service quality of some services based on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12
Inventor 葛卫民郭晓飞罗咏梅康杨
Owner TIANJIN UNIV