Abstract
Relays are a cost-efficient way to extend or distribute high data rate coverage more evenly in next generation cellular networks. This paper introduces a radio resource management solution based on dynamic and flexible resource assignment and cooperative relaying as key technologies to enhance the downlink performance of relay-based OFDMA cellular networks. It is illustrated how the dynamic resource assignment is combined with beamforming in a macrocellular deployment and with soft-frequency reuse in a metropolitan area deployment. The cooperative relaying solution allows multiple radio access points to cooperatively serve mobile stations by combining their antennas and using themultiantenna techniques available in the system. The proposed schemes are compared to BS only deployments in test scenarios, which have been defined in the WINNER project to be representative for next generation networks. The test scenarios are well defined and motivated and can serve as reference scenarios in standardisation and research. The results show that the proposed schemes increase the average cell throughput and more importantly the number of users with low throughput is greatly reduced.
Highlights
Mobile users in generation communication systems are expecting seamless coverage with a guaranteed Quality of Service (QoS) to allow for a similar user experience as provided by today’s broadband internet connections
For both modes an overall system bandwidth of 100 MHz was chosen in order to meet the peak data rates that were established as research targets for systems beyond IMT-2000 [51]
In this paper we presented key technologies that allow to exploit the potential benefits of a relay-based deployment
Summary
Mobile users in generation communication systems are expecting seamless coverage with a guaranteed Quality of Service (QoS) to allow for a similar user experience as provided by today’s broadband internet connections. We propose two key radio resource management techniques to exploit the full potential of relay enhanced cellular OFDMA networks: dynamic and flexible resource assignment in a relay enhanced cell and cooperative relaying. We have developed these techniques during five years (2003–2008) of extensive research on cellular relay networks within. We present numerical evaluation results on the achievable downlink gains from dynamic resource assignment and cooperative relaying compared to BS-based deployments.
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