Behavioral learning of exposed terminals in IEEE 802.11 wireless networks
ICUFN'09 Proceedings of the first international conference on Ubiquitous and future networks
| Hi-index | 0.00 |
Spatial reuse is critical for ad hoc network with limited bandwidth. Exposed terminals are refrained from transmitting in 802.11 like protocols and the network capacity is wasted in high-density ad hoc network. In this paper, we propose a new scheme named SB-FSMA/CA to mitigate the exposed terminals problem in static ad hoc network or mesh network. SB-FSMA/CA mitigates exposed terminals problem by using signal strength of the neighboring nodes. 2-hop neighbor’s information and dialogue correlation coefficient are two key features of our proposed scheme. Based on the 2-hop neighbor’s information, an exposed terminal captures a frame of ongoing dialogue and calculates the correlation coefficient between the primary dialogue and dialogue to be built before trying to transmit. If the correlation coefficient is lower than a certain threshold, the exposed terminal is permitted to communicate with its destination in parallel with primary dialogue. SB-FSMA/CA mitigates exposed terminals problem by allowing exposed terminals satisfying the correlation coefficient constraint to transmit simultaneously. Simulation result shows that the average throughput of SB-FSMA/CA outperforms that of 802.11 DCF by 25% in high-density ad hoc network.