In low power wide area (LPWA) networks, low-cost end devices (EDs) such as sensors communicate with a central base station (BS) using pure ALOHA protocol. In particular, half-duplex is considered wherein the BS switches from receiving to transmitting mode after receiving a packet successfully from an ED in order to send the acknowledgement. Since the EDs can not know at the moment when the BS turns to the receiving mode, the packets transmitted by the EDs during the receiving mode of the BS are lost. To investigate performance of such half-duplex pure ALOHA systems, this paper develops a semi-Markov (SM) process model for pure ALOHA channel with infinite population. Furthermore, the SM process is approximated with an $M/M/1$ system in order to analyze the system with finite population. As results, this paper presents how the performance of half-duplex system is influenced by switching time, backoff interval of EDs, and stability criteria of the system, which are verified through system simulations.
Half-Duplex ALOHA Systems for Low Power Wide Area Networks
2018-06-01
407216 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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