Radio Resource Management in OFDMA-based Cellular Relay Networks
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چکیده
The main objective of next-generation wireless networks is to accommodate the increasing user demand and to achieve a ubiquitous high-data-rate coverage so that mobile broadband services comparable to those of the wirelines are realized in a costefficient manner. This ambitious objective however faces several technical challenges in the conventional cellular architecture, e.g., the large pathloss. Wireless multihop relaying is therefore among the envisioned solutions; for that relayswith much less functionality and cost than base stationscan extend coverage, overcome shadowing through routing, and/or improve detection in a cooperative manner. Hence, a future network comprising various forms of dedicated wireless relays is envisaged in many wireless standardization bodies and forums which have adopted orthogonal frequency division multiple access (OFDMA) as the prospective air interface. The synergy of multihop relaying and OFDMA techniques offers a very rich set of opportunities but renders an unsuitable environment for static resource planning. This is due to the increased system dynamics, the portion of resources invested in operating the wireless relays, and the co-channel interference associated with the inevitable aggressive reuse of the scarce licensed spectrum. Therefore, intelligent radio resource management (RRM) schemes are required to combat the interference and to operate the relays in a dynamic and opportunistic manner. It is not immediately clear though how to perform RRM in such a complex environment. As such, RRM could be the main obstacle confronting the deployment and operation of future networks.
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تاریخ انتشار 2010