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Adaptive adjustment system and method of length and speeds of AP (access point) downlink aggregation frame

A technology of self-adaptive adjustment and frame aggregation, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve problems such as inability to accurately estimate channels, affect network throughput, etc., and improve downlink throughput , avoid packet loss and retransmission, and reduce the effect of air interface time

Active Publication Date: 2014-12-17
XIDIAN UNIV
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Problems solved by technology

[0009] All of the above methods are unable to accurately estimate the channel, resulting in the estimated transmission rate is not the best transmission rate, affecting the improvement of network throughput

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  • Adaptive adjustment system and method of length and speeds of AP (access point) downlink aggregation frame
  • Adaptive adjustment system and method of length and speeds of AP (access point) downlink aggregation frame
  • Adaptive adjustment system and method of length and speeds of AP (access point) downlink aggregation frame

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Embodiment Construction

[0071] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0072] refer to figure 1 , the technical principle of the present invention is as follows:

[0073] When the AP sends data to the station, the link status between it and the station is unknown. Therefore, before the AP sends data, it needs to establish a BACK mechanism between the AP and the station. First, it sends an ADDBA request frame and receives an ADDBA response frame to link. At the same time, in order to avoid the loss of the first frame and affect the transmission of subsequent frames, the AP uses the RTS / CTS handshake mechanism when sending the first frame.

[0074] After the AP sends the AMPDU frame to the station, it uses the BACK request frame to request the station to confirm. The AP measures the receiving power of the BACK confirmation frame fed b...

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Abstract

The invention discloses an adaptive adjustment system and an adaptive adjustment method of the length and speeds of an AP (access point) downlink aggregation frame, and mainly aims at solving the problem that speeds and the length of a transmit frame can not adapt to channel change due to frequent change of channel quality between an AP and a website in a wireless network. The adaptive adjustment method of the length and the speeds of the AP downlink aggregation frame includes the implementation steps that 1) the AP calculates transmission speed and error sub-frame rates of a current aggregation frame and estimates effective handling capacity so as to forecast channel quality; 2) the AP forecasts a variation tendency of a channel according to values of the error sub-frame rates of a front segment and a back segment of a bit code table; 3) the AP adaptively adjusts the length and the speeds of the aggregation frame, and selects MIMO (multiple input multiple output) work modes of a physical layer according to a BACK signal to noise ratio; 4) the AP analyzes the maximum continuous number of 0 in the bit code table, judges whether collision occurs in current transmission, and adaptively starts an RTS / CTS mechanism to avoid the collision. The adaptive adjustment system and the adaptive adjustment method of the length and the speeds of the AP downlink aggregation frame have the advantages of being rapid in response for the channel change and good in adaptation, and can be used in the wireless network in which the channel quality frequently changes.

Description

technical field [0001] The present invention relates to the field of wireless communication networks, in particular to a system and method for adaptively adjusting the downlink aggregation frame length and rate of an access point AP realized through the cooperation of the medium access control MAC layer and the physical layer, and is used to solve the problem of infrastructure-type wireless networks. When the quality of the channel between the AP and the receiving node changes frequently, the transmission rate of the current sent frame and the frame length of the aggregated frame cannot adapt to the channel, resulting in too many transmission failures, and the transmission performance of the network is improved. Background technique [0002] The main technology adopted by wireless local area network WLAN is IEEE 802.11 series standard agreement at present. From 1999, the IEEE802.11 working group successively proposed the IEEE 802.11a and IEEE802.11b standards to 2003, the 80...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/16H04L5/00
Inventor 边策刘吉龙陈庆勇姚明旿邱智亮刘焕峰
Owner XIDIAN UNIV
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