System and method for adaptive adjustment of AP downlink aggregate frame length and rate

A technology for adaptive adjustment and aggregation of frames, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve problems affecting network throughput and cannot accurately estimate channels, etc., to improve downlink throughput , avoid packet loss and retransmission, and reduce the effect of air interface time

Active Publication Date: 2018-04-10
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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  • System and method for adaptive adjustment of AP downlink aggregate frame length and rate
  • System and method for adaptive adjustment of AP downlink aggregate frame length and rate
  • System and method for adaptive adjustment of AP downlink aggregate frame length and rate

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Embodiment Construction

[0071] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail 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, so before the AP sends data, it needs to establish a BACK mechanism between the AP and the station. First, the link is performed by sending an ADDBA request frame and receiving an ADDBA response frame. Channel quality detection, and in order to avoid the loss of the first frame and affect subsequent frame transmission, the AP uses the RTS / CTS handshake mechanism when sending the first frame.

[0074] After AP sends AMPDU frame to station, use BACK request frame to request station confirmation. The AP measures the received power of the BACK confirmation frame fed back by the station a...

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Abstract

The invention discloses an adaptive adjustment system and method for AP downlink aggregation frame length and rate, which mainly solves the problem that the rate and frame length of sending frames cannot adapt to channel changes due to frequent changes in channel quality between APs and stations in a wireless network. The problem. The implementation steps are as follows: 1) AP calculates the transmission rate and errored subframe rate of the current aggregated frame and estimates the effective throughput to predict channel quality; Change trend; 3) AP adaptively adjusts the length and rate of the aggregation frame, and selects the MIMO working mode of the physical layer according to the SNR of BACK; 4) AP analyzes the maximum number of consecutive "0"s in the bit code table, Determine whether the current transmission is collided, and adaptively enable the RTS / CTS mechanism to avoid collisions. The invention has the advantages of fast response to channel changes and good adaptability, and can be used in wireless networks with frequent channel quality changes.

Description

Technical field [0001] The present invention relates to the field of wireless communication networks, in particular to a system and method for adaptive adjustment of the length and rate of the access point AP downlink aggregation frame realized by the cooperation of the media access control MAC layer and the physical layer, which is used to solve the basic structure wireless network When the channel quality 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, which causes excessive transmission failure, and improves the transmission performance of the network. Background technique [0002] The main technology currently adopted by the wireless local area network WLAN is the IEEE 802.11 series of standard protocols. From the IEEE 802.11 working group in 1999, the IEEE 802.11a and IEEE 802.11b standards were put forward one after another to the 802.11g stand...

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Application Information

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Patent Type & Authority Patents(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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