Abstract
With the increasing wireless communication demands, frequency spectrum has become more and more limited and expensive. This paper proposes a novel optimization objective: minimizing the required frequency resource, on the premise that both the power constraints and users’ quality of service (QoS) demands can be met. With the frequency saving objective, the primary system can release the unnecessary frequencies for other applications, such as subordinate or cognitive networks. In this paper, we formulate the number of subcarriers minimization problem for both uplink and downlink OFDMA-based networks, which is a mixed NP-hard problem. For the downlink case, we propose an efficient near-optimal algorithm to solve the problem. For the uplink case, we derive low complexity greedy algorithms to obtain tight lower bound and upper bound. Simulation results show that our algorithms can significantly save the system’s frequency resource.
This work was supported in part by the National Science Foundation of USA (#1032567) and in part by the National Science Foundation of China (#61001146) and (#60702020).
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© 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering
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Ru, G., Li, H., Lu, Y., Cheng, Y., Lin, W. (2012). Frequency Saving OFDMA Resource Allocation with QoS Provision. In: Ren, P., Zhang, C., Liu, X., Liu, P., Ci, S. (eds) Wireless Internet. WICON 2011. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 98. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30493-4_33
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DOI: https://doi.org/10.1007/978-3-642-30493-4_33
Publisher Name: Springer, Berlin, Heidelberg
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