Improving TCP Performance over Wireless Ad Hoc Networks with Busy Tone Assisted Scheme
Date
2006
Authors
He, Qi
Cai, Lin
Shen, Xuemin (Sherman)
Ho, Pinhan
Journal Title
Journal ISSN
Volume Title
Publisher
Hindawi Publishing Corporation
Abstract
It is well known that transmission control protocol (TCP) performance degrades severely in IEEE 802.11-based wireless ad hoc
networks.We first identify two critical issues leading to the TCP performance degradation: (1) unreliable broadcast, since broadcast
frames are transmitted without the request-to-send and clear-to-send (RTS/CTS) dialog and Data/ACK handshake, so they are
vulnerable to the hidden terminal problem; and (2) false link failure which occurs when a node cannot successfully transmit data
temporarily due to medium contention.We then propose a scheme to use a narrow-bandwidth, out-of-band busy tone channel to
make reservation for broadcast and link error detection frames only. The proposed scheme is simple and power efficient, because
only the sender needs to transmit two short messages in the busy tone channel before sending broadcast or link error detection
frames in the data channel. Analytical results show that the proposed scheme can dramatically reduce the collision probability
of broadcast and link error detection frames. Extensive simulations with different network topologies further demonstrate that
the proposed scheme can improve TCP throughput by 23% to 150%, depending on user mobility, and effectively enhance both
short-term and long-term fairness among coexisting TCP flows in multihop wireless ad hoc networks.
Description
SpringerOpen
Keywords
Citation
He et al. Improving TCP Performance over Wireless Ad Hoc Networks with Busy Tone Assisted Scheme. EURASIP Journal on Wireless Communications and Networking Volume 2006, Article ID 51610,