TY - JOUR
T1 - Opportunistic cooperative networking
T2 - To relay or not to relay?
AU - Gong, Xiaowen
AU - Ps, Chandrashekhar Thejaswi
AU - Zhang, Junshan
AU - Poor, H. Vincent
N1 - Funding Information:
Manuscript received 14 April 2011; revised 20 July 2011. This research was supported in part by the National Science Foundation under Grant CNS-0905603 and in part by the Air Force Office of Scientific Research under Grants FA 9550-08-1-0480 and FA 9550-09-1-0643.
PY - 2012/2
Y1 - 2012/2
N2 - This paper considers opportunistic cooperative networking (OCN) in wireless ad hoc networks, with a focus on characterizing the desired tradeoff between the probing cost for establishing cooperative relaying and hence higher throughput via opportunistic cooperative networking. Specifically, opportunistic cooperative networking is treated as an optimal stopping problem with two-levels of incomplete information. Cases with or without dedicated relays are considered, and the existence of the optimal strategies for both cases are established. Then, it is shown that for the case with dedicated relays, the optimal strategy exhibits a threshold structure, in which it is optimal to probe the dedicated relay when the signal-to-noise ratio (SNR) of the source-relay link exceeds some threshold. For the case without dedicated relays, under more restrictive conditions, the optimal strategy is also threshold-based, in the sense that it is optimal to probe potential relays when the SNR of the source-destination link lies between two thresholds. Furthermore, these strategies can be implemented in a distributed manner.
AB - This paper considers opportunistic cooperative networking (OCN) in wireless ad hoc networks, with a focus on characterizing the desired tradeoff between the probing cost for establishing cooperative relaying and hence higher throughput via opportunistic cooperative networking. Specifically, opportunistic cooperative networking is treated as an optimal stopping problem with two-levels of incomplete information. Cases with or without dedicated relays are considered, and the existence of the optimal strategies for both cases are established. Then, it is shown that for the case with dedicated relays, the optimal strategy exhibits a threshold structure, in which it is optimal to probe the dedicated relay when the signal-to-noise ratio (SNR) of the source-relay link exceeds some threshold. For the case without dedicated relays, under more restrictive conditions, the optimal strategy is also threshold-based, in the sense that it is optimal to probe potential relays when the SNR of the source-destination link lies between two thresholds. Furthermore, these strategies can be implemented in a distributed manner.
KW - Ad hoc networks
KW - cooperative relaying
KW - distributed opportunistic scheduling
KW - optimal stopping
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U2 - 10.1109/JSAC.2012.120209
DO - 10.1109/JSAC.2012.120209
M3 - Article
AN - SCOPUS:84863044084
SN - 0733-8716
VL - 30
SP - 307
EP - 314
JO - IEEE Journal on Selected Areas in Communications
JF - IEEE Journal on Selected Areas in Communications
IS - 2
M1 - 6136814
ER -