The single-hop star-of-stars topology of current Low Power Wide Area Network (LPWAN) is simple and robust but still lack of network coverage because of signal attenuation. We present a forwarding mechanism to increase the coverage and re-liability of LPWAN. Two key characteristics of our approach are on-demand and opportunistic forwarding. While most previous studies adopt fixed-path forwarding protocols to realize multi-hop transmission in LPWAN, we adopt opportunistic forwarding for better reliability. Opportunistic forwarding works well in the uncertainties of wireless communication since it does not predefined the forwarding path. Moreover, to reduce redundant transmissions usually found in forwarding approaches, we adopt an on-demand and priority-based forwarding mechanism. That is, a relay can only forward after it receives status feedback from the network server and if it has packets that the server is missing.To overcome the bottleneck problem in on-demand forwarding,we employ Random Linear Network Coding (RLNC) with compressed header overhead for transmitting multiple packets in relays. Compared to fixed-path forwarding, our mechanism shows better performance in terms of end-to-end packet delivery ratio.

Authors: Dion Tanjung, Seunggyu Byeon and Jong Deok Kim

Conference: ICOIN 2020

Publisher: IEEE & KIISE

Conference Date: 2020. 1. 7

Proceeding: PDF