A channel access scheduling method and access scheduling controller

Abstract

The invention provides a channel access scheduling method and a network access scheduling controller. The direction and the distance of each node are determined by the position of a network controller in a network, nodes are partitioned to be in a plurality of areas with the network controller as a center, and the distance of the nodes is used as a mark of starting and retreating of the nodes. According to the number of divided areas, the network controller allots contention windows of corresponding numbers and the values of retreating indexes, grading is conducted, and then the areas and grades are mapped randomly. The network controller is used for judging whether node data which have service quality requirements exist in the network, if yes, the area where the node is placed corresponds to a set of value of the highest grade, and channel access operation is conducted after the distance is set to be zero. When the area where the node is placed does not correspond to the set of value of the highest grade, the set of value is set to be the highest grade and the channel access operation is conducted after the distance is set to be zero. If not, channel access operation is conducted on the node of each area. The channel access scheduling method and the network access scheduling controller can lower the probability of data collision and the times of retransmission under the condition that Qos is met.

Description

technical field [0001] The present invention relates to the field of network technologies, in particular to a channel access scheduling method. Background technique [0002] In the wireless sensor network, the node adopts the carrier sense multiple access (CSMA / CA) mechanism based on the time slot to access the channel, and the probability of data collision and data retransmission when the network scale is large. It will increase accordingly, and in the GB / T15629.15-2010 standard, it does not support QoS service requirements, so it is necessary to reasonably schedule the node channel access mechanism in the network, and add a mechanism that can support QoS requirements to achieve the Reduce the probability of data collision and data retransmission while meeting QoS requirements. [0003] In the prior art, a CSMA / CA channel access mechanism that supports QoS in beacon-enabled mode is proposed for wireless sensor networks. The method adopts a Gaussian distribution backoff str...

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Problems solved by technology

[0002] In wireless sensor networks, nodes use time slot-based Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA) mechanism to access channels. When the network scale is large, the probability of data collision and data retransmission It will become larger accordingly, and in the GB / T15629.15-2010 standard, Qos service requirements are not supported, so it is necessary to reasonably schedule the node channel access mechanism in the network, and add a mechanism that can support Qos requirements, so as to achieve Reduce the probability of data collision and data retransmission while meeting Qos requirements

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