Abstract
This paper proposes a large-scale wireless powered communication network (WPCN), which consists of a hybrid access point (H-AP) and numerous nodes. The H-AP broadcasts energy to all nodes, and the nodes harvest the energy and then use the harvested energy to transmit information. For the large-scale WPCN, we also propose a novel hybrid multiple access protocol, termed hybrid multiple access-based dual harvest-then-transmit. The proposed protocol utilizes both time division multiple access (TDMA) and carrier-sense multiple access (CSMA), in order to deal with various traffic patterns and transmission reliability of different applications in large-scale networks. We consider a dual wireless energy transfer (WET) at the H-AP. The main WET is performed in TDMA and the other WET is performed at space holes in CSMA, to increase the channel utilization and harvested energy. For the considerations, we study the sum-throughput maximization in the large-scale WPCN based on hybrid multiple access-based dual harvest-then-transmit. Simulation results show that the proposed protocol outperforms the conventional protocol in large-scale WPCN.
Highlights
There has been a great interest in a large-scale wireless network, such as internet of things (IoT) and a low-power wide-area network (LPWAN) due to the easiness of maintenance and the economic advantages for deployment compared to wired networks [1,2,3]
A typical wireless powered communication networks (WPCN) consists of a hybrid-access point (H-AP) and multiple nodes, where the H-AP performs the wireless energy transfer (WET) in downlink (DL) and the nodes carry out the wireless information transfer (WIT) in uplink (UL) by using the harvested energy [7,8,9,10]
For large-scale WPCN, we propose a protocol termed hybrid multiple access-based dual harvest--transmit protocol, which guarantees the transmission reliability by time division multiple access (TDMA) and the other transmission is performed by carrier-sense multiple access (CSMA)
Summary
There has been a great interest in a large-scale wireless network, such as internet of things (IoT) and a low-power wide-area network (LPWAN) due to the easiness of maintenance and the economic advantages for deployment compared to wired networks [1,2,3]. We propose a novel protocol for a large-scale WPCN, named hybrid multiple access-based dual harvest--transmit (H-DHT). Some nodes, which generate periodic traffic and require the transmission reliability, only report their states to the H-AP, in order to obtain time slots in the TP. For large-scale WPCN, we propose a protocol termed hybrid multiple access-based dual harvest--transmit protocol, which guarantees the transmission reliability by TDMA and the other transmission is performed by CSMA. That generate periodic traffic and require the transmission reliability, transmit the SI to the H-AP for the slot allocation in the TDMA period. In [11], a time division multiple access (TDMA)-based system model is presented for WPCN and a harvest--transmit protocol is described, where. It is worth noting that Ps and the rate of transmission reliability is depending on the system of interest
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