摘要(英) |
In recent years, broadband wireless access (BWA) networks have been rapidly evolved to satisfy the increasing demands of users for ubiquitous and seamless access to various kinds of services. In order to achieve anytime, anywhere, and longer non-stop access to broadband networks through mobile devices with limited power, the power saving is a critical issue toward this objective.
Based on the basic sleeping mode concept, this thesis proposes a power saving centric scheduling scheme for uplink traffic while taking the quality of service (QoS) as a constraint requirements. The uplink resource allocation is quite different from that of the downlink resource allocation scheme, because the uplink traffic is queued at the mobile stations (MS) side and base station (BS) has no information about it and cannot allocate radio resource properly. MS will raise bandwidth request (BR) to BS, the BS according to radio resource to allocate bandwidth to each connection after receive BR, and bandwidth allocation in the UL-MAP to each MS.
In this thesis both of the rtPS and nrtPS service types are studies. These two service types have different QoS requirement and, therefore, have different design in their sleeping arrangement and scheduling policy. The simulation results are compared with the standard sleeping approach of the WiMax network. The simulation results show that the proposed scheme achieves better sleep efficiency than the standard scheme and can also satisfy the QoS requirements.
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參考文獻 |
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