Abstract
In this paper, we study an opportunistic power scheduling problem in relay-based OFDMA cellular networks. In most previous works on relay-based cellular networks, scheduling at relay stations (RSs) is not allowed. Hence, each RS should immediately transmit all the received data from the base station (BS) in the first phase in a time-slot to mobile stations (MSs) in the second phase in the same time-slot. In this strategy, the effective data rate of the two-hop transmission (BS-RS and RS-MS) is limited to the rate of the link with worse channel state among two links. Hence, in those systems, even though opportunistic scheduling is allowed in the BS, time-varying channel state of each link cannot be fully exploited, which may result in wastes of radio resources. However, if opportunistic scheduling is allowed not only at the BS but also at each RS, the BS and each RS can fully exploit time-varying channel state of each link, so that more efficient radio resource allocation is possible. We formulate a stochastic optimization problem that aims at maximizing the average sum-rate of relay-based networks where the time-varying wireless channel is modeled as a stochastic process. By solving the problem, we develop an optimal power scheduling algorithm which can be implemented in a distributed manner at the BS and each RS. Simulation results show that by allowing opportunistic scheduling at both the BS and RSs, we can improve system performance more significantly.
| Original language | English |
|---|---|
| Title of host publication | 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings |
| DOIs | |
| Publication status | Published - 2009 Sep 22 |
| Event | 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary Duration: 2009 Apr 5 → 2009 Apr 8 |
Publication series
| Name | IEEE Wireless Communications and Networking Conference, WCNC |
|---|---|
| ISSN (Print) | 1525-3511 |
Other
| Other | 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 |
|---|---|
| Country | Hungary |
| City | Budapest |
| Period | 09/4/5 → 09/4/8 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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Opportunistic power scheduling for OFDMA cellular networks with scheduling at relay stations. / Kim, Byung Gook; Lee, Jang Won.
2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings. 2009. 4917864 (IEEE Wireless Communications and Networking Conference, WCNC).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Opportunistic power scheduling for OFDMA cellular networks with scheduling at relay stations
AU - Kim, Byung Gook
AU - Lee, Jang Won
PY - 2009/9/22
Y1 - 2009/9/22
N2 - In this paper, we study an opportunistic power scheduling problem in relay-based OFDMA cellular networks. In most previous works on relay-based cellular networks, scheduling at relay stations (RSs) is not allowed. Hence, each RS should immediately transmit all the received data from the base station (BS) in the first phase in a time-slot to mobile stations (MSs) in the second phase in the same time-slot. In this strategy, the effective data rate of the two-hop transmission (BS-RS and RS-MS) is limited to the rate of the link with worse channel state among two links. Hence, in those systems, even though opportunistic scheduling is allowed in the BS, time-varying channel state of each link cannot be fully exploited, which may result in wastes of radio resources. However, if opportunistic scheduling is allowed not only at the BS but also at each RS, the BS and each RS can fully exploit time-varying channel state of each link, so that more efficient radio resource allocation is possible. We formulate a stochastic optimization problem that aims at maximizing the average sum-rate of relay-based networks where the time-varying wireless channel is modeled as a stochastic process. By solving the problem, we develop an optimal power scheduling algorithm which can be implemented in a distributed manner at the BS and each RS. Simulation results show that by allowing opportunistic scheduling at both the BS and RSs, we can improve system performance more significantly.
AB - In this paper, we study an opportunistic power scheduling problem in relay-based OFDMA cellular networks. In most previous works on relay-based cellular networks, scheduling at relay stations (RSs) is not allowed. Hence, each RS should immediately transmit all the received data from the base station (BS) in the first phase in a time-slot to mobile stations (MSs) in the second phase in the same time-slot. In this strategy, the effective data rate of the two-hop transmission (BS-RS and RS-MS) is limited to the rate of the link with worse channel state among two links. Hence, in those systems, even though opportunistic scheduling is allowed in the BS, time-varying channel state of each link cannot be fully exploited, which may result in wastes of radio resources. However, if opportunistic scheduling is allowed not only at the BS but also at each RS, the BS and each RS can fully exploit time-varying channel state of each link, so that more efficient radio resource allocation is possible. We formulate a stochastic optimization problem that aims at maximizing the average sum-rate of relay-based networks where the time-varying wireless channel is modeled as a stochastic process. By solving the problem, we develop an optimal power scheduling algorithm which can be implemented in a distributed manner at the BS and each RS. Simulation results show that by allowing opportunistic scheduling at both the BS and RSs, we can improve system performance more significantly.
UR - http://www.scopus.com/inward/record.url?scp=70349190661&partnerID=8YFLogxK
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U2 - 10.1109/WCNC.2009.4917864
DO - 10.1109/WCNC.2009.4917864
M3 - Conference contribution
AN - SCOPUS:70349190661
SN - 9781424429486
T3 - IEEE Wireless Communications and Networking Conference, WCNC
BT - 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings
ER -