On tile-and-energy allocation in OFDMA broadband wireless networks

Jia Ming Liang*, Jen Jee Chen, Cheng Wen Liu, Yu-Chee Tseng, Bao-Shuh Lin 

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The Orthogonal Frequency Division Multiple Access (OFDMA) technique has been widely applied in broadband wireless networks, such as IEEE 802.16 (WiMAX) and 3GPP Long Term Evolution (LTE). Existing studies have targeted at improving network throughput by increasing the transmission rates of mobile stations (MSs). Nevertheless, this is at the cost of higher energy consumption of MSs. In the letter, we consider the tile-and-energy joint allocation problem for uplink transmissions in an OFDMA wireless network. We formulate this problem as a mixed integer programming, where the objective is to minimize MSs' energy consumption subject to satisfying their traffic demands. We show this to be NP-hard and develop a heuristic taking advantage of the water-filling technique. Simulation results show that the performance of our heuristic is close to the optimum, especially when the network is under non-saturated condition.

Original languageEnglish
Article number6051399
Pages (from-to)1284-1287
Number of pages4
JournalIEEE Communications Letters
Issue number12
StatePublished - 1 Dec 2011


  • 3GPP LTE
  • energy conservation
  • IEEE 802.16
  • resource management
  • WiMAX

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