Energy-saving centric uplink scheduling scheme for broadband wireless access networks
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RESEARCH
Open Access
Energy-saving centric uplink scheduling scheme for broadband wireless access networks Yen-Wen Chen1, Yen-Yin Chu1* and I-Hsuan Peng2
Abstract This study proposes an energy-saving centric uplink scheduling (ESC-US) scheme to support efficient energy usage and satisfy the quality of service (QoS) requirements of Worldwide Interoperability for Microwave Access (WiMax) networks. The uplink resource allocation is different from that of the downlink resource allocation scheme because the uplink traffic is queued at the mobile station (MS) and the base station (BS) has no information regarding it without using a polling procedure. The considered resource scheduling schemes maximize the sleep efficiency and consider the QoS requirements of individual MSs. The proposed scheduling scheme in this study considers the delay budget of MSs with real-time connections and the required minimum reserved traffic rate (MRTR) of MSs with non-real time connections when maximizing sleep efficiency. Both scheduling schemes for the traffic of real-time polling services (rtPS) and non-real-time polling services (nrtPS) apply the ‘just enough QoS’ and ‘sleep before transmission’ (SbT) concepts to achieve this energy-saving centric objective. Exhaustive simulations were conducted to examine the performance of the proposed schemes. The simulation results show that both schemes guarantee the desired QoS and achieve superior energy-savings efficiencies compared to the conventional scheme. Keywords: Bandwidth requests; Energy-saving; Minimum reserved traffic rate; Scheduling; WiMax
1 Introduction The rapid progress of broadband wireless access technologies, such as Worldwide Interoperability for Microwave Access (WiMax) [1] and long-term evolution (LTE) [2], and power mobile devices stimulates the flourishing deployment of mobile internet services. However, the slow improvement in battery technologies [3] has led to an exponentially increasing gap between available and required battery capacities [4]. Therefore, conserving energy is a crucial factor for mobile devices in practical applications. Because wireless internet is a shared medium, device energy efficiency is affected not only by the layers that compose the point-to-point communication link but also the interaction between the links in the entire network [5]. Therefore, the efficient conservation of energy to achieve longer mobile station (MS) operation times is vital to the success of mobile internet services. Furthermore, most wireless access networks provide the quality of service (QoS) * Correspondence: [email protected] 1 Department of Communication Engineering, National Central University, Jhongli City, Taoyuan County 01, Taiwan Full list of author information is available at the end of the article
mechanism to ensure that users receive the desired service qualities of various services, such as data, voice, video, and multimedia, through appropriate radio resource allocation and scheduling at the base station (BS). WiMax defines three types of power-saving
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