Title :
Opportunistic media access control and rate adaptation for wireless ad hoc networks
Author :
Wang, Jianfeng ; Zhai, Hongqiang ; Fang, Yuguang ; Yuang, Maria C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
Abstract :
Many rate adaptation schemes at the medium access control (MAC) layer have been proposed to utilize the multirate capability offered by the IEEE 802.11 wireless MAC protocol through automatically adjusting the transmission rate to best match the channel conditions. In this paper, we present the Opportunistic packet Scheduling and Auto Rate (OSAR) protocol to exploit the channel variations. The basic idea of OSAR is as follows: rather than just matching the channel condition for a node pair in communications, our protocol takes advantage of the multiuser diversity as much as possible and adapt the rate accordingly, i.e., based on the channel conditions to its neighboring nodes, the sender chooses the neighboring node with channel quality better than certain level to schedule the transmissions of packets in its queue, then the overall system throughput may be increased. The key mechanisms of OSAR are channel aware media access, rate adaptation and packet bursting. We carry out several sets of ns-2 simulations and evaluate the impact of various factors such as channel condition, network topology and traffic load on the throughput of OSAR. Simulation results show that our proposed protocol can achieve much better performance than other auto rate schemes.
Keywords :
access protocols; ad hoc networks; multiuser channels; network topology; queueing theory; telecommunication traffic; wireless LAN; 802.11 wireless MAC protocol; channel condition; channel quality; media access control; multiuser diversity; network topology; ns-2 simulation; oppurtunistic packet scheduling auto rate protocol; packet bursting; packet queue transmission; rate adaptation scheme; traffic load; wireless ad hoc network; Access protocols; Ad hoc networks; Electronic mail; Land mobile radio cellular systems; Media Access Protocol; Mobile ad hoc networks; Scheduling algorithm; Throughput; Wireless LAN; Wireless application protocol;
Conference_Titel :
Communications, 2004 IEEE International Conference on
Print_ISBN :
0-7803-8533-0
DOI :
10.1109/ICC.2004.1312471