TY - GEN
T1 - Joint optimal channel probing and transmission in collocated wireless networks
AU - Zheng, Dong
AU - Zhang, Junshan
PY - 2007
Y1 - 2007
N2 - We consider a collocated wireless network where all links contend for a given channel and each link can hear others' transmissions. Due to channel fading, the link condition corresponding to a successful channel probing could be either good or bad. In the latter case, further channel probing may lead to better channel conditions, which in turn yields higher throughput. There is clearly a tradeoff between the throughput gain from better channel conditions and the cost for further channel probing. The desired tradeoff can be achieved by choosing the optimal stopping time for channel probing and the transmission rate, in the sense of maximizing the overall average throughput. Using optimal stopping theory, we show that the joint optimal channel probing and transmission (JOCPT) strategy is apure threshold policy, and interestingly, the threshold turns out to be the optimal average throughput, which is the solution to a fixed point equation. Since the optimal throughput usually cannot be obtained in closed form, we derive a lower bound and an upper bound on the optimal throughput, and devise an iterative algorithm to compute it. Finally, we use numerical examples to show that significant throughput gain can be achieved by the JOCPT strategy.
AB - We consider a collocated wireless network where all links contend for a given channel and each link can hear others' transmissions. Due to channel fading, the link condition corresponding to a successful channel probing could be either good or bad. In the latter case, further channel probing may lead to better channel conditions, which in turn yields higher throughput. There is clearly a tradeoff between the throughput gain from better channel conditions and the cost for further channel probing. The desired tradeoff can be achieved by choosing the optimal stopping time for channel probing and the transmission rate, in the sense of maximizing the overall average throughput. Using optimal stopping theory, we show that the joint optimal channel probing and transmission (JOCPT) strategy is apure threshold policy, and interestingly, the threshold turns out to be the optimal average throughput, which is the solution to a fixed point equation. Since the optimal throughput usually cannot be obtained in closed form, we derive a lower bound and an upper bound on the optimal throughput, and devise an iterative algorithm to compute it. Finally, we use numerical examples to show that significant throughput gain can be achieved by the JOCPT strategy.
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U2 - 10.1109/INFCOM.2007.262
DO - 10.1109/INFCOM.2007.262
M3 - Conference contribution
AN - SCOPUS:34548299946
SN - 1424410479
SN - 9781424410477
T3 - Proceedings - IEEE INFOCOM
SP - 2266
EP - 2270
BT - Proceedings - IEEE INFOCOM 2007
T2 - IEEE INFOCOM 2007: 26th IEEE International Conference on Computer Communications
Y2 - 6 May 2007 through 12 May 2007
ER -