Title :
Asynchronous Contention Resolution Diversity ALOHA: Making CRDSA Truly Asynchronous
Author :
De Gaudenzi, Riccardo ; del Rio Herrero, Oscar ; Acar, Gunes ; Garrido Barrabes, Eloi
Author_Institution :
Eur. Space Agency, Noordwijk, Netherlands
Abstract :
Following the introduction of contention resolution diversity slotted ALOHA (CRDSA), a number of variants of the scheme have been proposed in literature. A major drawback of these slotted random access (RA) schemes is related to the need to keep slot synchronization among all transmitters. The volume of signaling generated to maintain transmitters´ slot synchronization is impractical for large networks. In this paper, we describe in detail asynchronous contention resolution diversity ALOHA (ACRDA), which represents the evolution of the CRDSA RA scheme. ACRDA provides better throughput performance with reduced demodulator complexity and lower transmission latency than its predecessor while allowing truly asynchronous access to the shared medium. The performance of the ACRDA protocol is evaluated via mathematical analysis and computer simulations and is compared with that of CRDSA.
Keywords :
access protocols; demodulators; diversity reception; mathematical analysis; radio transmitters; satellite communication; signalling protocols; synchronisation; ACRDA protocol; CRDSA RA scheme; asynchronous contention resolution diversity ALOHA; computer simulation; demodulator complexity reduction; mathematical analysis; network throughput performance; satellite communication; signaling volume; slotted random access scheme; transmission latency; transmitter slot synchronization; Demodulation; Encoding; Payloads; Synchronization; Throughput; Transmitters; SCADA systems; Satellite communication; interference suppression; multiaccess communication; time division multiple access;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2014.2334620
