Cooperation with multiple relays in wireless sensor networks: optimal cooperator selection and power assignment

2013 ◽  
Vol 20 (2) ◽  
pp. 209-225 ◽  
Author(s):  
M. Sarper Gokturk ◽  
Ozgur Gurbuz
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Wireless Sensor ◽  
Power Assignment ◽  
Multiple Relays

Power Assignment for Symmetric Communication in Wireless Sensor Networks

2009 ◽  
Vol 5 (2) ◽  
pp. 185-200
Author(s):  
Joongseok Park ◽  
Sartaj Sahni
Keyword(s):  
Wireless Sensor Networks ◽  
Wireless Sensor Network ◽  
Sensor Networks ◽  
Cost Reduction ◽  
Spanning Trees ◽  
Minimum Cost ◽  
Approximation Ratio ◽  
Wireless Sensor ◽  
Power Assignment ◽  
Power Cost

We show that two incremental power heuristics for power assignment in a wireless sensor network have an approximation ratio 2. Enhancements to these heuristics are proposed. It is shown that these enhancements do not reduce the approximation ratio of the considered incremental power heuristics. However, experiments conducted by us indicate that the proposed enhancements reduce the power cost of the assignment on average. Further, the two-edge switch enhancements reduce the power-cost reduction (relative to using minimum cost spanning trees) that is, on average, twice as much as obtainable from any of the heuristics proposed earlier.

Performance Analysis of Multiple Relays Cooperative Truncated Automatic Repeat Request in Wireless Sensor Networks

2019 ◽  
Vol 17 (9) ◽  
pp. 733-738
Author(s):  
Yong-Qiang Zhou ◽  
Lei Dai ◽  
Suo-Ping Li
Keyword(s):  
Energy Efficiency ◽  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Packet Transmission ◽  
Transmission Delay ◽  
Wireless Sensor ◽  
Automatic Repeat Request ◽  
Mathematical Expressions ◽  
Average Transmission ◽  
Multiple Relays

In this paper, we research the performance of direct and non-direct multiple relays cooperative truncated automatic repeat request (D/ND-MRCT-ARQ) protocols in wireless sensor networks (WSNs). We propose a method that named discrete time Markov chain (DTMC) with N + 2 states, which could obtain the throughput formulas of D/ND-MRCT-ARQ protocols. Furthermore, we solve the mathematical expressions of the average transmission delay of both protocols by truncating the number of packet retransmission. In addition, we derive energy efficiency formulas of both protocols under considering the different power consumption of each node. Simulation results demonstrate that the proposed D-MRCT-ARQ protocol achieve higher throughput and energy efficiency while fewer average packet transmission delay, as compared with the ND-MRCT-ARQ protocol.

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