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CSMA/CA multiple access method based on threshold service

An access method and threshold technology, applied in the direction of electrical components, wireless communication, etc., can solve the problems of not being able to support high load, low-delay services, and low bandwidth utilization of wireless access networks, so as to improve throughput and Effects of link utilization, low cost, and shortened contention delay

Inactive Publication Date: 2018-09-14
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a CSMA / CA media access control protocol based on threshold service to improve the throughput of the network, aiming at the problem that the bandwidth utilization rate of the wireless access network is low and cannot well support high-load and low-delay services amount, reducing data frame delay

Method used

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  • CSMA/CA multiple access method based on threshold service
  • CSMA/CA multiple access method based on threshold service

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after reading the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0030] figure 1 It is a flowchart of node channel access and data transmission in the present invention, as shown in the figure,

[0031] In step S1, the node that needs to access the channel first seizes the channel according to the CSMA / CA protocol, that is, if the node detects that the channel has been idle for DIFS time, it starts to back off randomly. During the backoff process, the node monitors the channel once every time slot. If the channel is idle, the ba...

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Abstract

The invention provides a CSMA / CA multiple access method based on a threshold service. The method comprises the following steps that a node needing to be accessed into a channel preempts the channel according to a CSMA / CA protocol; when a value of a backoff counter is reduced to 0, the node checks the length of a cache queue, and sets a value of the residual counter as the length of the cache queue; the node sends a data frame and starts the timer to record the time for waiting for ACK confirmation; whether the node receives the ACK confirmation in the ACK-TIMEOUT time or not is judged, and ifyes, the data frame is sent successfully. According to the method, the competition time delay of the node can be greatly reduced, and the data frame can be sent out once as soon as possible, so that the network throughput is improved, the average time delay and the delay jitter of the data frame are reduced, and the system stability is enhanced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a threshold service-based carrier sense multiple access (Carrier Sense Multiple Access / Collision Avoidance, hereinafter referred to as CSMA / CA) multiple access method with collision avoidance. Background technique [0002] With the rapid development of the Internet and the large-scale use of smart terminals, the traffic of mobile communication networks is growing rapidly. According to the Cisco white paper, the current annual growth rate of global mobile communication data traffic is 47%. By 2021, the annual mobile data traffic will exceed 0.5ZB, and more than half of them are real-time services such as voice and video. About 60% of the world's traffic is offloaded through Wi-Fi networks, so this puts forward higher requirements on the network capacity of wireless LANs such as Wi-Fi. Currently, wireless networks can support higher link rates. For example, ...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/0816
Inventor 黄欢欢叶通李东
Owner SHANGHAI JIAO TONG UNIV
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