本論文提出一個下行鏈路(Downlink)資源分配演算法係針對混合網路中各種不同性質之服務流使用於以正交分頻多工存取(Orthogonal Frequency Division Multiple Access, OFDMA)技術為基礎之無線環境，其根據各服務流特性，提出一個低計算複雜度兼具效能之資源分配演算法應用於第四代無線通訊系統中如長期演進 (Long-Term Evolution, LTE-A)無線網路系統。本篇之設計動機於設計一個資源分配演算法不僅可維持即時(Real time, RT)服務之服務品質(Quality of Service, QoS)，也可透過比例型公平演算法(Proportional Fairness, PF)提升非即時(Non-real time, NRT)服務之資料傳輸量，以達到保證RT服務之QoS要求且提升整體系統傳輸量。透過模擬，我們觀察到提出之演算法可以維持RT服務之QoS，並能有效地提高整體系統傳輸效能。

In this paper, a low computational complexity and effective way to improve the downlink resource allocation algorithm is presented, which involves the users of mix traffics over LTE-A (Long-Term Evolution Advanced) wireless networks. Our research objective is to guarantee the QoS (Quality of Service) requests from real time (RT) services and the proportional fairness (PF) of resource allocation from non-real time (NRT) services. The downlink resource allocation algorithm we proposed is able to schedule real time (RT) and non-real time (NRT) services according to each priority factor defined by us, and allocate resources through evaluating different priority factors. From the simulation results, it is shown that the performance of proposed algorithm not only guarantee the QoS for the RT services also helps improve the NRT services’ usage, so as to enhance the downlink transmission efficiency over LTE-A wireless networks.

[1] E. Lee, and H. K. Park, “Packet scheduling scheme for multiple services in mobile WiMAX system,” in Proc. of Second International Conference on Computer and Network Technology (ICCNT ‘10), April 2010, pp.60 - 63.
[2] S. Ryu, B. Ryu, H. Seo, and M. Shin, “Urgency and Efficiency based Packet Scheduling Algorithm for OFDMA wireless System,” in Proc. of IEEE International Conference on Communications (ICC 2005), vol. 4, May 2005, pp. 2779 - 2785.
[3] Y. S. Kim, “An efficient scheduling scheme for HSDPA system in mixed traffic environments,” IEEE Communications Letters, vol. 12, no. 9, pp. 624 - 626, Sept. 2008.
[4] S. Choi, K. Jun, Y. Shin, S. Kang, and B. Choi, “MAC scheduling scheme for VoIP traffic service in 3G LTE,” in Proc. of the 66th IEEE Vehicular Technology Conference (VTC2007), Sep. 2007, pp.1441 - 1445.
[5] S. Saha, and R. Quazi, “Priority-Coupling-a Semi-Persistent MAC Scheduling Scheme for VoIP Traffic on 3G LTE,” in Proc. of the 10th International Conference on Telecommunications, June 2009, pp. 325 - 329.
[6] Jalali A, Padovani R, Pankaj R., “Data throughput of CDMA-HDR a high efficiency-high data rate personal communication wireless system,” in Proc. of IEEE the 51st Vehicular Technology Conference (VTC'2000-Spring), Tokyo, Japan, 2000, pp. 1854–1858.
[7] Y. Zhang, W. Gao, Y. Lu, Q. Huang, and D. Zhao, “Joint source channel rate-distortion optimization for H.264 video coding over error-prone networks,” IEEE Trans. Multimedia, vol. 9, no. 3, pp. 445–454, Apr. 2007.
[8] Telecommunication Standardization Sector of International Telecommunication Union (ITU-T) Rec. ITU-T G.114: One-way transmission time, 2003.
[9] Dong Hoi Kim and Chung Gu Kang, “Delay Threshold-Based Priority Queueing Packet Scheduling for Integrated Services in Mobile Broadband Wireless Access System,” in Proc. IEEE Int. Conf. High Performance Computing and Communications, 2005, pp. 305 – 314.
[10] C.G Kang, T.W. Kim, and J.H. Kim, “Adaptive delay threshold-based priority queueing scheme with opportunistic packet scheduling for integrated service in mobile broadband wireless access systems,” IEEE Communications Letters, vol. 12, no. 4, pp. 241 - 243, April 2008.
[11] S. Aissa and G. Aniba, “Queuing models for dimensioning interactive and streaming services in high-speed downlink packet access networks,” IEEE Trans. Broadcasting, vol. 53, no. 3, pp. 619–627, Sep.2007.
[12] Erik Dahlman, Stefan Parkvall, and Johan Skold, 4G:LTE/LTE-Advanced for Mobile Broadband, Academic Press, 2011.
[13] Harri Holma and Antti Toskala, LTE for UMTS: Evolution to LTE-Advanced, John Wiley & Sons Ltd.,2011.
[14] S. Sesia, I. Toufik, and M. Baker, LTE - The UMTS Long Term Evolution, From Theory to Practice, John Wiley & Sons Ltd., 2009.
[15] 3GPP, TS 36.300, Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Overall description, V11.3.0( Release 11), November 2012.
[16] 3GPP, TR 36.912, Feasibility study for Further Advancements for E-UTRA (LTE-Advanced), V11.0.0 (Release 11), October 2012.
[17] 3GPP, TS 25.892, Feasibility study for Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN enhancement, V6.0.0, June 2004.
[18] Holma Harri and Toskala Antti, WCDMA for UMTS Radio Access for Third Generation Mobile Communications, Second Edition, John Wiley & Sons Ltd., 2002.
[19] ITU-T Rec. ITU-T G.711, Geneva, Pules Code Modulation (PCM) of voice frequencies, November 1988.
[20] Antonio J. Estepa, Juan M. Vozmediano, Jorge L´opez, and Rafael M. Estepa, “Impact of VoIP codecs on the Energy Consumption of Portable Devices,” in Proc. of the 6th ACM workshop on Performance monitoring and measurement of heterogeneous wireless and wired networks, 2011, pp.123-130.
[21] 3GPP, TS 23.107, Universal Mobile Telecommunications System (UMTS), Quality of Service (QoS) concept and architecture(Release 10), V10.2.0, January 2012.
[22] 3GPP, TS 22.105, Universal Mobile Telecommunications System (UMTS), Services and service capabilities (Release 10), V10.0.0, May 2011.
[23] 3GPP TS 36.211, Evolved Universal Terrestrial Radio Access (E-UTRA): Physical channels and modulation (Release 10), V10.4.0, January 2012.
[24] ITU-T Rec. ITU-T H.264, Serials H：Audio Visual And Multimedia Systems, Infrastructure of audiovisual services - Coding of moving video, Advanced video coding for generic audiovisual services, January 2012.
[25] 3GPP TS 36.300, Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Network architecture; Overall description; Stage 2, V11.3.0 (Release 11), November 2012.
[26] Xiaoyue Zhu, Si Wen, Gen Cao, Xin Zhang, and Dacheng Yang, “QoS-based resource allocation scheme for Device-to-Device (D2D) radio underlaying cellular networks, ” in Proc. of the 19th International Conference on Telecommunications (ICT 2012) , June 2012, pp.1-6.
[27] B. Al-Manthari, H. Hassanein, N. Ali, and N. Nasser, “Fair Class-Based Downlink Scheduling with Revenue Considerations in Next Generation Broadband Wireless Access Systems,” IEEE Transactions on Mobile Computing, pp. 721–734, 2009.