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Two-stage frame aggregation method

A frame aggregation and frame length technology, which is applied in network traffic/resource management, digital transmission systems, electrical components, etc., can solve the problems of throughput performance degradation, control data delay, etc., to ensure throughput performance, service quality, The result is real-time accurate effect

Active Publication Date: 2012-10-10
TIANJIN UNIV
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Problems solved by technology

[0010] The invention provides a two-level frame aggregation method, which enables the two-level frame aggregation mechanism to automatically adjust the A-MSDU frame length according to the channel bit error rate and service delay requirements, and solves the problem of throughput performance degradation and control data delay problem, see the description below:

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041]In wireless local area networks, the wireless channel changes rapidly, and the network throughput performance is easily affected by the real-time bit error rate of the channel. The existing frame aggregation mechanism with fixed frame length and fixed number of subframes cannot be adjusted with channel changes, resulting in network throughput decline in performance. For services with strong real-time latency requirements, in order to ensure service quality, the data latency must be within the required range, and the current frame aggregation technology does not have a latency control mechanism. In view of the above problems, the embodiment of the present invention proposes a two-level frame aggregation method, which comprehensive...

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Abstract

The invention discloses a two-stage frame aggregation method which comprises the following steps that a media access control (MAC) level two-dimensional Markov chain model is established, and the free probability of a network, data sending successful probability and data collision probability in the network as well as the length of an MAC level time slot which corresponds to the state of the network are obtained; the length Lth of an A-MSDU frame which enables the saturation throughput S of the network to be the highest is obtained; the upper limit Llimit of the length of the A-MSDU frame which meets a time delay requirement Dmax is obtained; the length Lth of the A-MSDU frame and the upper limit Llimit of the length of the A-MSDU frame (whichever is smaller) is selected as the length LA-MSDU of the final A-MSDU frame; and the A-MSDU frame is determined according to the length LA-MSDU of the A-MSDU frame, and two-stage frame aggregation is realized. The problems of throughput performance reduction and data time delay control are solved by automatically adjusting the length of the A-MSDU frame.

Description

technical field [0001] The invention belongs to the field of MAC layer of wireless local area network, in particular to a two-level frame aggregation method. Background technique [0002] With the high-speed growth of wireless communication traffic, it is necessary to increase the throughput of wireless local area network to meet the needs of users. The IEEE 802.11n standard greatly improves the transmission rate of the physical layer of the wireless LAN by adopting multiple input multiple output (MIMO) technology and orthogonal frequency division multiplexing (OFDM) technology. With the increase of the physical layer rate, the inefficiency of the traditional MAC layer protocol becomes the main factor limiting the growth of WLAN throughput. In the traditional wireless LAN MAC layer protocol, each data packet needs to add a MAC layer header, and the data packets are transmitted in a separate access channel and a separate confirmation method, which brings a lot of space and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/06H04L1/00
Inventor 杨晋生邵新明
Owner TIANJIN UNIV
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