DMCA
A Rate-Adaptive MAC Protocol for Multi-Hop Wireless Networks (2001)
| Citations: | 484 - 5 self |
BibTeX
@INPROCEEDINGS{Holland01arate-adaptive,
author = {Gavin Holland and Nitin H. Vaidya and Paramvir Bahl},
title = {A Rate-Adaptive MAC Protocol for Multi-Hop Wireless Networks},
booktitle = {},
year = {2001},
pages = {236--251},
publisher = {}
}
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Abstract
Wireless local area networks (W-LANs) have become increasingly popular due to the recent availability of affordable devices that are capable of communicating at high data rates. These high rates are possible, in part, through new modulation schemes that are optimized for the channel conditions bringing about a dramatic increase in bandwidth efficiency. Since the choice of which modulation scheme to use depends on the current state of the transmission channel, newer wireless devices often support multiple modulation schemes, and hence multiple data rates, with mechanisms to switch between them. Users are given the option to either select an operational data rate manually or to let the device automatically choose the appropriate modulation scheme (data rate) to match the prevailing conditions. Automatic rate selection protocols have been studied for cellular networks but there have been relatively few proposals for W-LANs. In this paper we present a rate adaptive MAC protocol called the Receiver-Based AutoRate (RBAR) protocol. The novelty of RBAR is that its rate adaptation mechanism is in the receiver instead of in the sender. This is in contrast to existing schemes in devices like the WaveLAN II [15]. We show that RBAR is better because it results in a more efficient channel quality estimation which is then reected in a higher overall throughput Our protocol is based on the RTS/CTS mechanism and consequently it can be incorporated into many medium access control protocols including the widely popular IEEE 802.11 protocol. Simulation results of an implementation of RBAR inside IEEE 802.11 show that RBAR performs consistently well.
Keyphrases
multi-hop wireless network rate-adaptive mac protocol many medium access control efficient channel quality estimation popular ieee high rate high data rate cellular network multiple modulation scheme rate adaptation mechanism automatic rate selection protocol multiple data rate wireless local area network rate adaptive mac protocol bandwidth efficiency wireless device modulation scheme affordable device data rate prevailing condition receiver-based autorate wavelan ii recent availability new modulation scheme simulation result operational data rate transmission channel current state rts ct mechanism channel condition dramatic increase appropriate modulation scheme
