Abstract
With the growing concerns about energy saving and security problems in wireless sensor networks (WSNs), we investigated a joint energy saving scheduling and secure routing algorithm for critical event reporting in WSN. When a critical event has been detected, the notification must be safely sent to the sink node through the uplink transmission, and the sink node needs to broadcast the alarm messages to the whole network through the downlink transmission. In the uplink, a joint power allocation and secure routing strategy (JPASR) has been proposed to maximize the routing secure connection probability (RSCP) under the constraint of power. Meanwhile, combined with the level-by-level sleeping scheduling method, the energy-saving and secure uplink transmission can be guaranteed. In the downlink, an energy-first multi-point relays set selection mechanism (EFMSS) is designed to choose the backbone nodes to broadcast messages, and the backbone nodes are waken up by the same level-by-level sleeping scheduling method as the uplink transmission. With the two-step procedure, the critical events are appropriately dealt with and the responses are broadcast to the whole network. Extensive simulations results demonstrate that the energy saving and security performances of the proposed method are superior to the existing ones.
Highlights
Wireless sensor networks (WSNs) have grown rapidly in the recent years and are widely applied to communication, surveillance, health care and disaster management system and so on [1], [2]
We evaluate the performance of three kinds of routing algorithms for the uplink transmission in WSNs: the proposed joint power allocation and secure routing strategy (JPASR), flow augmentation (FA) [16] and SR [23]
COMPARISON OF energy-first multi-point relays set selection mechanism (EFMSS) AND coverage first MPRs set selection algorithm (CFMSS) The traditional CFMSS selects the MPR nodes of each layer according to the principle of the nearest distance, while EFMSS takes both the coverage and energy into account
Summary
Wireless sensor networks (WSNs) have grown rapidly in the recent years and are widely applied to communication, surveillance, health care and disaster management system and so on [1], [2]. To prevent WSNs from eavesdropping, cryptographic technology was utilized in [17]; To guard against traffic analysis attacks, packet transmission rate was controlled in [18] These solutions based on the upper layers will bring a large amount of running and storage overhead, which is not adaptable to WSNs due to the energy, memory and other limitations on sensor nodes. Different from the previous researches, we develops a tractable framework that jointly considers energy-saving secure routing in the uplink and energy-saving sleeping scheduling in uplink and downlink for event supervisory control in WSNs. The contributions are given as follows: 1) In the uplink transmission, a joint power allocation and secure routing scheme (JPASR) is proposed. 2) In the downlink transmission, an energy first multi-hop relays set selection strategy (EFMSS) is proposed to choose one-hop neighbors with more residual energy as multi-hop relays (MPRs) to route messages from the sink node to the whole network in the broadcasting procedure.
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