Hybrid MAC protocol method for cluster-structure multi-carrier acoustic sensor network

Abstract

The invention discloses a hybrid MAC protocol method for a cluster-structure multi-carrier acoustic sensor network. The hybrid MAC protocol method comprises the following steps: fusing a scheduling type MAC protocol with a competitive type MAC protocol into a hybrid acoustic communication network MAC protocol, realizing MAC protocol dynamic switching for all nodes in the network by virtue of a global synchronization time, and classifying data with different attributes through a cross layer design thought and then transmitting. Two transmission modes of free burst IBT and active polling IPT are adopted, data messages transmitted in the two different transmission modes are periodic messages and burst messages respectively, IBT time slots and IPT time slots are alternately carried out, and the length of the free burst IBT time slots is dynamically adjustable, so that the needs of transmission for the various messages in the sensor network can be met, the communication energy consumption of the sensor network can be reduced simultaneously when the service quality of the network can be ensured.

Description

technical field [0001] The present invention relates to a media access control (Media Access Control, MAC) protocol at the data link layer of an underwater acoustic sensor network, in particular to a hybrid MAC protocol method for a cluster-structured multi-carrier underwater acoustic sensor network, belonging to the technical field of underwater acoustic signal processing . Background technique [0002] The MAC layer protocol of the underwater acoustic sensor network needs to make full use of the characteristics of the physical layer channel under the premise of ensuring the network QoS (Quality of Service, quality of service) and comprehensively consider the needs of the upper layer application to reduce the communication energy consumption of the network as much as possible. The MAC protocol design of the underwater acoustic sensor network is data-oriented, and the design cannot fully refer to the layer division of the underwater acoustic communication network protocol ar...

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Problems solved by technology

[0002] The MAC layer protocol of the underwater acoustic sensor network needs to make full use of the characteristics of the physical layer channel under the premise of ensuring the network QoS (Quality of Service, quality of service) and comprehensively consider the needs of the upper layer application to reduce the communication energy consumption of the network as much as possible. The MAC protocol design of the underwater acoustic sensor network is data-oriented, and the design cannot fully refer to the hierarchical division of the underwater acoustic communication network protocol architecture. It is necessary to use cross-layer thinking to coordinate the relationship between the MAC protocol and other layers.

[0003] The two types of MAC protocols for underwater acoustic sensor networks have their own advantages and disadvantages: the scheduling MAC protocol can assign communication resources to each member node in the cluster in advance, so it can perform centralized resource allocation and scheduling according to the actual transmission needs of each node, reducing Channel competition consumes energy and improves channel utilization, but its data transmission delay is usually large, and generally cannot flexibly allocate resources according to the actual transmission needs of nodes; the channel resources of the contention-based MAC protocol are completely based on the actual transmission needs of nodes Allocation, when the network load is low, the data transmission delay can be well controlled, but it has a certain energy loss when each node competes for the channel. When the network load is high, the data transmission delay and competition energy loss will increase significantly

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