Adaptive error control method applied to wireless sensor network

Abstract

The invention discloses a hybrid automatic repeat request (HARQ)-automatic repeat request (ARQ)-cross-layer-interactive-cooperation-based adaptive error control method applied to a wireless sensor network, and belongs to the technical field of adaptive error control for cooperative communication in the wireless sensor network. In the method, a cross-layer design is adopted, hybrid automatic repeat request (HibridARQ) is adopted in a data link layer, automatic repeat request (ARQ) is adopted in a physical layer, the repeat number i of the hybrid automatic repeat request of the link layer and the repeat number j of the automatic repeat request of the physical layer are adaptively selected according to different requirements of an application server on quality of service (QoS), and an optimal error control scheme is determined; and simultaneously, a relay node number and a communication distance threshold value which are required by the cooperative communication are determined according to a communication distance between a transmitter and a receiver, a next-hop relay node is selected, and a multi-relay cooperative transmission path is adaptively created. The method has the advantages of ensuring the high transmission reliability of the wireless sensor network, simultaneously shortening time delay and achieving relatively higher throughput and energy efficiency.

Description

technical field [0001] The present invention relates to an adaptive error control method applicable to wireless sensor networks, in particular to an adaptive error control method based on HARQ-ARQ cross-layer interactive cooperation applicable to wireless sensor networks, belonging to cooperative communication adaptive error control methods in wireless sensor networks field of control technology. Background technique [0002] Compared with traditional wireless Ad Hoc network data transmission, wireless sensor network communication has its special QoS (Quality of Service) requirements: [0003] 1. Sensor nodes are generally powered by batteries, which are limited in energy and are difficult to replace for one-time deployment. Moreover, due to the limitation of node size and development cost, the storage space and data processing capabilities of sensor nodes are limited to a large extent. Therefore, cooperative communication energy efficiency needs to be considered. [0004]...

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Problems solved by technology

[0005] 3. Sensor nodes may fail due to energy exhaustion, and new sensor nodes may be added to the network topology, causing the wireless sensor network topology to be in a dynamic state, so that there are "when to cooperate" and "with whom to cooperate" in cooperative communication. "Relay selection problem, so sensor nodes need to have data transmission path and relay selection adaptive adjustment function

[0006] 4. The operation results of the existing wireless sensor network platform show that compared with the traditional wireless Ad Hoc network, the link quality of the wireless sensor network is poor, and the packet loss rate of the wireless link is as high as 50%. Therefore, how to share sensor node resources, Relying on the "mutual cooperation" between sensor nodes, seeking a data transmission mode and error control strategy between data transmission reliability and high energy efficiency has become one of the urgent problems to be solved in the research of wireless sensor networks.

[0008] Generally speaking, there are application services in the actual system that are both sensitive to delay and have high requirements on reliability. Obviously, HARQ and ARQ alone cannot meet the needs of such services.

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