Data priority-based channel contention access method for wireless sensor network

Abstract

The invention discloses a data priority-based channel contention access method for a wireless sensor network. The method of the invention ensures different performance index requirements by adopting different channel access mechanisms according to the priority levels (high and low levels) of data packets. In addition, aggregation factors are introduced into the transmission of the data packets, and the data packets are aggregated by using the local calculation and storage capacity of a node on the premise of meeting the specific network performance requirement, so the framing efficiency is improved and the energy consumption efficiency is further improved. Through the parameter aggregation factors, the network can be flexibly selected between the energy consumption efficiency and the data average packet delay.

Description

technical field [0001] The invention relates to a channel competition access method based on data priority in a wireless sensor network, which is suitable for a series of wireless sensor network applications in star or tree network topologies such as military defense, environmental monitoring, and industrial and agricultural production. Especially in applications where the network load is not heavy and data packets have different priorities, it can greatly reduce the delay of high-priority data packets and improve the flexibility of network configuration without losing part of the network performance. Background technique [0002] Wireless sensor network (WSN) is a task-based wireless network, a wireless network composed of a large number of stationary or mobile sensor nodes with wireless communication and data processing capabilities in a self-organizing or multi-hop manner, the purpose of which is to cooperatively perceive , Collect, process and transmit the monitoring inf...

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Problems solved by technology

[0009] (1) The protocol does not distinguish the priority of data packets, and adopts a consistent CSMA / CA competition mechanism (same CW, BE, NB), but in many application environments such as environmental monitoring and intrusion detection, the priority level of each data packet is different. Similarly, for example, in environmental monitoring, when the monitoring data is within the normal range, the data packet can be allowed to reach the destination node with a certain delay. The packet needs to reach the destination node with the shortest possible delay. The priority of the data packet in these two cases is obviously different, and the standard does not take this into account

[0010] (2) The physical frame format of the IEEE 802.15.4 standard consists of four parts: a synchronization signal (SYNC), a frame start delimiter (SFD), a frame length (Frame Length) and a payload (MPDU). The service data is contained in the MPDU Among them, except for business data, all other control information overhead does not carry business, but consumes energy. This waste can be measured by framing efficiency, which is equal to the transmission time of business data in one frame and the transmission time of the whole frame. Compare

It can be seen that this waste is particularly obvious when the user business data is relatively small, and the IEEE 802.15.4 standard does not analyze and process this

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