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Long distance CSMA/CA protocol with QoS assurance

A long-distance, protocol technology, applied in the field of long-distance CSMA/CA protocol, which can solve problems such as loss of channel utilization

Active Publication Date: 2018-03-23
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention designs two different dynamic priority threshold calculation schemes: a direct mapping function (DFM) scheme and a differential trend (DT) scheme to solve the problem of channel utilization loss caused by a fixed threshold

Method used

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  • Long distance CSMA/CA protocol with QoS assurance
  • Long distance CSMA/CA protocol with QoS assurance
  • Long distance CSMA/CA protocol with QoS assurance

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The long-distance CSMA / CA protocol with QoS guarantee can be regarded as based on the traditional narrowband CSMA / CA, and different control parameters are set for different priority services through the channel duty-to-idle ratio to control the probability of different levels of service flow accessing the system . In the traditional CSMA / CA system, there are only two states of the channel: idle and busy. When the data packet backoff ends and needs to be sent, the monitoring channel is allowed to send if the channel is idle at this time, and the channel enters the backoff stage when the channel is busy. The channel duty-to-idle ratio refers to the extent to which the channel is busy within a predetermined period of time. The duty-to-idle threshold is added to control the probability of different priority data packets accessing the system...

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Abstract

The invention discloses a long distance CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) protocol with QoS (Quality of Service) assurance, a node in a communication channel executes the following steps: (1) entering a backoff stage after sending of the previous data packet is finished in a sending queue; (2) according to priority conditions of the data packets in the existing sending queue, extracting the data packet with the highest priority and arranging the extracted data packet at the head of the sending queue; (3) calculating a channel busy-to-idle ratio and a priority threshold corresponding to the data packet of the head of the sending queue; (4) after the backoff stage is ended, detecting the busy-to-idle ratio of the current channel, and comparing the priority threshold corresponding to the data packet of the head of the sending queue with the busy-to-idle ratio of the current channel, if the busy-to-idle ratio of the current channel is less than the priority threshold corresponding to the data packet, enabling the data packet to be accessed to the channel and sending the data packet, and returning back to the step (1). According to the long distance CSMA / CA protocol with QoS assurance provided by the invention, performance requirement of the data packet with high priority is satisfied through delay of access of the data packet with low priority, and hereby, a collision probability is reduced and a throughput is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a long-distance CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) protocol based on QoS (Quality of Service, Quality of Service) guarantee. Background technique [0002] The physical address MAC protocols in the aeronautical ad hoc network are mostly divided into two types: the MAC protocol based on the allocation class and the MAC protocol based on the contention class. Most mature aeronautical self-organizing MAC protocols are based on distribution-based MAC protocols, and only the contention-based MAC protocol is used in the TTNT data link of the US military. [0003] The TDMA-based aeronautical self-organizing network is characterized by better system performance, but in the existing analysis, the time synchronization of the entire network is defaulted, which is difficult to achieve in a state of war because satellites or management nodes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/22H04W74/08H04L12/851H04L12/863
CPCH04L47/2433H04L47/6215H04W16/22H04W74/0808H04W74/085
Inventor 仇启明方正丁勇飞丁良辉张来鹏顾时豪
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST