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Multiband Scheduler for Future Communication Systems

International Journal of Communications, Network and System Sciences 2008年第1期1卷 1-9页

作者： Klaus DOPPLER carl wijting Tero HENTTONEN Kimmo VALKEALAHTI Klaus DOPPLER Carl WIJTING Tero HENTTONEN Kimmo VALKEALAHTI Radio Communications CTC Nokia Research Center Helsinki Finland

Operation in multiple frequency bands simultaneously is an important enabler for future wireless communication systems. This article presents a new concept for scheduling transmissions in a wireless radio system operating in multiple frequency bands: the Multiband Scheduler (MBS). The MBS ensures that the operation in multiple bands is transparent to higher network layers. Special attention is paid to achieving low delay and latency when operating the system in the multiband mode. In particular, we propose additions to the ARQ procedures in order to achieve this. Deployment details and assessment results are presented for two multiband deployment scenarios. The first scenario is operation in a spectrum sharing context where multiple bands are used: one dedicated band for basic service and one shared extension band for extended services. In the second scenario we consider multiband operation in a relay environment, where the two bands have different propagation properties and relays provide extra coverage and capacity in the whole cell.

关键词： Multiband Operation Scheduling Multiband Scheduler IMT-Advanced Relaying Dynamic Spectrum Use Flexible Spectrum Use Spectrum Sharing

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Device-to-Device Communication Underlaying Cellular Communications Systems

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International Journal of Communications, Network and System Sciences 2009年第3期2卷 169-178页

作者： Pekka JANIS Chia-Hao YU Klaus DOPPLER Cassio RIBEIRO carl wijting Klaus HUGL Olav TIRKKONEN Visa KOIVUNEN Department of Communications and Networking Helsinki University of Technology Espoo Finland Department of Signal Processing and Acoustics Helsinki University of Technology Espoo Finland Nokia Research Center Nokia Group Helsinki Finland

In this article we propose to facilitate local peer-to-peer communication by a Device-to-Device (D2D) radio that operates as an underlay network to an IMT-Advanced cellular network. It is expected that local services may utilize mobile peer-to-peer communication instead of central server based communication for rich mul-timedia services. The main challenge of the underlay radio in a multi-cell environment is to limit the inter-ference to the cellular network while achieving a reasonable link budget for the D2D radio. We propose a novel power control mechanism for D2D connections that share cellular uplink resources. The mechanism limits the maximum D2D transmit power utilizing cellular power control information of the devices in D2D communication. Thereby it enables underlaying D2D communication even in interference-limited networks with full load and without degrading the performance of the cellular network. Secondly, we study a single cell scenario consisting of a device communicating with the base station and two devices that communicate with each other. The results demonstrate that the D2D radio, sharing the same resources as the cellular net-work, can provide higher capacity (sum rate) compared to pure cellular communication where all the data is transmitted through the base station.

关键词： Peer-to-Peer Device-to-Device Power Control Cellular Systems IMT-Advanced

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