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Proceedings Paper

Performance comparison of reservation MAC protocols for PLC access networks under specific traffic conditions
Author(s): Halid Hrasnica; Ralf Lehnert
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Paper Abstract

Recent and future communications networks have to provide QoS guarantees for a rapidly growing number of various telecommunications services. This can be ensured by application of an efficient MAC layer. Various communications technologies, such as cellular networks and PLC access networks, apply reservation MAC protocols, providing a good network utilization, which is important for networks with limited data rate, and ensuring realization of different QoS guarantees. In this investigation, we compare the performance of so-called one-step reservation protocols, represented by slotted ALOHA and active polling, with a hybrid two-step reservation protocol. The protocols are investigated in their extended variants, including piggybacking, signaling over data channels and dynamic backoff mechanism. The protocols are implemented within a simulation model representing an OFDMA/TDMA scheme, which is outlined as a suitable solution for the PLC networks. Nevertheless, the achieved results can be generalized and interpreted for any other multiple access schemes, as well as for other communications technologies. To observe networks with different subscriber behavior, we define a traffic mix representing internet based data traffic, which is mainly expected in the access networks, such as PLC. As expected, the two-step protocol achieves always the best performance, compared with both one-step protocols. On the other hand, the fairness between the subscribers belonging to the same traffic class is ensured in all three investigated MAC protocols. However, a performance variation can be observed between different traffic classes.

Paper Details

Date Published: 8 August 2003
PDF: 12 pages
Proc. SPIE 5244, Performance and Control of Next-Generation Communications Networks, (8 August 2003); doi: 10.1117/12.511000
Show Author Affiliations
Halid Hrasnica, Dresden Univ. of Technology (Germany)
Ralf Lehnert, Dresden Univ. of Technology (Germany)

Published in SPIE Proceedings Vol. 5244:
Performance and Control of Next-Generation Communications Networks
Robert D. van der Mei; Frank Huebner, Editor(s)

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