Abstract
Terahertz wireless nano-sensor networks (WNSNs) are novel networks interconnecting multiple nano-devices by means of wireless communication. In this paper, a centralized energy harvesting-based time division multiple access (TDMA) protocol, called CEH-TDMA is proposed. This protocol examines the data transmission process from a global perspective, where the nano-controller regulates the channel access and allocates time slots for all nano-nodes. First, each nano-node sends the remaining energy and the number of packets in its data buffer to the nano-controller, and then, the nano-controller constructs a Markov decision process (MDP) model according to the state information of all nano-nodes, where the energy consumption and the number of transmitted packets in the entire network are considered as impact factors in designing the award function in the MDP model. Finally, a globally optimal slot allocation strategy is obtained, which maximizes the amount of packet transmission in the perpetual WNSNs.
Highlights
Nanotechnology enables the design and manufacture of nano-sensors with sensing, data storing, computing and communication capabilities [1]
The larger system state space causes the CEH-time division multiple access (TDMA) protocol to make channel access decisions longer than DEH-TDMA, CEH-TDMA determines the number of time slot blocks included in a frame based on the data and energy states of the nano-nodes and assigns time slots based on the priority of data transmission, so that nodes with larger data volume preferentially transmit data, such a dynamic time slot allocation method solves the problem of time slot wasting in DEH-TDMA, thereby reducing the average end to end delay
Since load-aware dynamic TDMA protocol (LA-TDMA) adopts a dynamic slot allocation scheme where no time slots are allocated to idle nano-nodes while more time slots are provided for those data burst nano-nodes, LA-TDMA outperforms other protocols in average end-to-end delay
Summary
Nanotechnology enables the design and manufacture of nano-sensors with sensing, data storing, computing and communication capabilities [1]. MAC protocol for Terahertz electromagnetic WNSNs (EEWNSN-MAC), which exploits the hierarchical structure and combines the contention free scheme, time division multiple access (TDMA) with a clustering algorithm for communication between nano-nodes. A load-aware dynamic TDMA protocol (LA-TDMA) [15], which realized the dynamic allocation of data transmission time slots on the basis of TDMA according to terahertz channel characteristics, number of nano-nodes and respective traffic volume of nodes. A centralized energy harvesting-based TDMA protocol, called CEH-TDMA is proposed. This protocol examines the data transmission process from a global perspective, where the nano-controller regulates the channel access and allocates time slots for all nano-nodes.
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