Self-adaptive MAC mechanism in tactical internet

Abstract

The invention relates to the technical field of wireless communication, in particular to a self-adaptive MAC mechanism in tactical Internet, which comprises the following steps of: acquiring a channel load value in a statistical period according to the rate of sending data packets by each node in a system and the real-time load condition of a statistical channel; calculating a data packet transmission success rate, and adaptively adjusting a channel maximum load value according to the transmission success rate; when each node sends a data packet, comparing the sum of the size of the data packet and the channel real-time load value with the maximum load value of the periodic channel to determine whether the data packet is sent or backoff; when the data packets need backoff, setting different backoff times for the data packets with different priorities, and setting the backoff time of the data packets with high priorities to be less than that of the data packets with low priorities. According to the invention, the throughput of the system is greatly improved, and the time delay of the system is reduced to a certain extent.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an adaptive MAC mechanism in the tactical Internet. Background technique [0002] With the development of the information age, information technology plays an increasingly critical role in modern warfare. The form of war has also gradually changed from the large-scale operations of a single arm to multi-arm coordinated operations, joint strikes, and precise positioning to maximize the overall combat efficiency. In order to meet the higher operational needs of the modern battlefield, countries around the world have invested a lot of manpower and material resources to conduct in-depth research on the tactical Internet. The emergence of the tactical Internet has accelerated the process of integrating sea, land, and air operations, accelerated the transmission of wartime data and information among various combat units, and greatly improved the overall informatization ...

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Problems solved by technology

[0004] However, in actual combat, due to the interference of the enemy and changes in the surrounding environment, the maximum carrying capacity of the wireless channel will also change accordingly. If you continue to use a fixed priority threshold, there may be a sharp increase in the packet loss rate or channel resources. Insufficient utilization and other problems, so there is an urgent need for a threshold adaptive adjustment strategy, so that when the communication system is subject to external interference, by calculating the real-time maximum carrying capacity of the channel, adaptively adjust the priority threshold, and then control the priority business data The probability of packet access to the channel makes the real-time channel load match the maximum carrying capacity of the channel to the greatest extent. When the channel carrying capacity changes, the communication system is always in a stable state by adjusting the probability of each data packet accessing the channel , so that the average delay of the communication system, the success rate of the first packet and the channel utilization rate are always maintained at a high level

[0005] Through a large number of investigations and based on the above discussion, the existing methods still fail to better solve the dynamic adjustment of the priority threshold according to the real-time channel situation, and when the load is heavy, the low-priority group cannot be accessed for a long time. channel, causing a large number of low-priority packets to "starve to death"

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