| 摘要(英) |
In recent years, mobile broadband wireless access networks have been rapidly evolved for the increasing demands of users. Because of the battery limits of ,mobile devices, power saving is an important issue for users to access vast range of services anytime, anywhere.
For most previous downlink scheduling research, eNode B only uses the UEs’ current packet state (e.g. delay), current channel quality to determine how to allocate resources. However, because power saving for UEs is not considered, these scheduling mechanisms will lead some UEs to exceed their quality of service requirements, and result in wasting power. In this thesis, scheduling mechanism simultaneously considering channel state condition, QoS, and also power saving effect in LTE with DRX environment is proposed.. The basic idea behind the our proposed scheduler is to reduce the useless duration for power consumption (e.g. rx with no data ) as much as possible in order to save power.
In this study, we take two different types of services, HTTP and Video Streaming, to simulate the different scheduling methods in the LTE network, and compare the performance of them. The results show that while considering different channel conditions, the proposed mechanism with HTTP request can achieve more fairness than traditional methods. Moreover, for Video Streaming traffic, the proposed mechanism can not only achieve power saving but also serve more users in single eNode B, ( ie. higher throughput )while meeting the UE’s QoS requirement.
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| 參考文獻 |
[1] Shiao-Li Tsao , You-Lin Chen, " Energy-efficient packet scheduling algorithms for real-time communications in a mobile WiMAX system," Computer Communications , Volume 31, Issue 10, pp. 2350-2359,25 June 2008.
[2] http://www.conniq.com/WiMAX/tdd-fdd.htm (2011/06/03)
[3] Moray Rumney BSc, C. Eng, MIET,"3GPP LTE: Introducing Single-Carrier FDMA,"Agilent Measurement Journal, Issue 4, pp.18-27, January 2008
[4] 3GPP TS 36.300 V9.2.0. Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2
[5] 3GPP TS 23.401 V9.3.0. General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access
[6] 3GPP TS 36.321 V9.0.0, Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification
[7] Chandra S. Bontu and Ed Illidge, Nortel, “DRX Mechanism for Power Saving in LTE ”, Communications Magazine IEEE , pp. 48-55, June 2009
[8] 3GPP TSG-RAN WG2 Meeting #57bis, R2-071285,St. Julian’s, Malta, Agenda item:5.2.3, Source: Nokia , Title: DRX parameters in LTE
[9] Jeroen Wigard, Troels Kolding, Lars Dalsgaard, Claudio Coletti, Nokia Siemens Networks, Res. Center Aalborg, Aalborg East, Denmark, "On the User Performance of LTE UE Power Savings Schemes with Discontinuous Reception in LTE", Communications Workshops 2009, pp. 1-5,June 2009.
[10] Aho Kari, Puttonen Jani, Henttonen Tero, Dalsgaard Lars , ” Channel Quality Indicator Preamble for Discontinuous Reception ”, Vehicular Technology Conference (VTC), pp. 1-5, 2010-Spring
[11] 3GPP TS 23.203 V9.4.0, Technical Specification Group Services and System Aspects, Policy and charging control architecture
[12] 3GPP TS 36.211 V9.1.0, Evolved Universal Terrestrial Radio Access (E-UTRA),Physical Channels and Modulation
[13] 3GPP TS 36.213 V9.1.0, Evolved Universal Terrestrial Radio Access (E-UTRA), Physical layer procedures
[14] 3GPP TS 36.101, Evolved Universal Terrestrial Radio Access (E-UTRA), User Equipment (UE) radio transmission and reception
[15] Dongzhe Cui. "LTE peak rates analysis". Wireless and Optical Communications Conference, WOCC, pp. 1-3,2009
[16] 3GPP TR 25.892 V6.0.0,Technical Specification Group Radio Access Network, Feasibility Study for Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN enhancement
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