针对蜂窝系统中的D2D增强型多播传输，分析了D2D重传效率与重传发射者数目之间的函数关系，推导了求解最优重传发射者的数目及子集划分的闭合表达式. 以此为理论基础，提出了一种基于有限反馈的D2D自适应协作重传方案. 该方案根据D2D链路质量自适应地选择重传发射者数目及最优重传路由，实现了多播增益与
多信道分集增益的联合优化. 仿真表明，该方案可显著提高D2D重传的频谱效率, 逼近理论最优解，提升蜂窝系统多播的吞吐量.
We focus on device-to-device (D2D) enhanced multicast transmission in cellular systems, formulate the relationship between the number of retransmitters and the efficiency of D2D retransmission, and derive a closed-form expression to search the optimal number of D2D retransmitters and the optimal sub-cluster partition. Based on the analysis, we propose an adaptive D2D cooperative retransmission scheme with limited channel feedback, which adaptively selects the number of retransmitters and the optimal routing. Exploiting the multicast gain and multi-channel diversity jointly, the proposed scheme achieves a significant gain in terms of spectrum efficiency compared to its counterparts with a fixed number of retransmitters.
[1] YU C H, DOPPLER K, RIBEIRO C B, TIRKKONEN O. Resource sharing optimization for Device-to-Device communication underlaying cellular networks [J]. IEEE Transaction on Wireless Communications, 2011, 10(8): 2752-2763.
[2] MIN H, SEO W, LEE J, PARK S. Reliability improvement using receive mode selection in the Device-to- Device uplink period underlaying cellular networks [J]. IEEE Transaction on Wireless Communications, 2011, 10(2): 413-418.
[3] JANIS P, YU C H, DOPPLER K, RIBEIRO C, WIJTING C, HUGL K, TIRKKONEN O, KOIVUNEN V. Device-to-Device communication underlaying cellular communications systems [J]. International Journal Communications, Network and System Sciences, 2009, 2(3): 169-178.
[4] WANG B, CHEN L, CHEN X, ZHANG X, YANG D C. Resource allocation optimization for Device-to-Device communication underlaying cellular networks [C]// IEEE Vehicular Technology Conference, Budapest, 2011: 1-6.
[5] HOU F, CAI L X, HO P H, SHEN X, ZHANG J. A cooperative multicast scheduling scheme for multimedia services in IEEE 802.16 networks [J]. IEEE Transaction on Wireless Communications, 2009, 8(3): 1508-1519.
[6] SPINELLA S C, ARANITI G, IERA A, MOLINARO A. Integration of ad-hoc networks with infrastructured systems for multicast services provisioning [C]// International Conference Ultra Modern Telecommunications & Workshops, St. Petersburg, 2009: 1-6.
[7] FITZEK F H P, KATZ M. Cognitive wireless networks: concepts, methodologies and visions inspiring the age of enlightenment of wireless communications [M]. New York: Springer, 2007: 31-59.
[8] ZHANG Q, FITZEK F H P, IVERSEN V B. Design and performance evaluation of cooperative retransmission scheme for reliable multicast services in cellular controlled P2P networks [C]// IEEE Personal Indoor and Mobile Radio Communications, Athens, 2007: 1-5.
[9] SEPPALA J, KOSKELA T, CHEN T, HAKOLA S. Network controlled device-to-device (D2D) and cluster multicast concept for LTE and LTE-A networks [C]// IEEE Wireless Communications and Networking Conference, Cancun, 2011: 986-991.
[10] TALHA B, PATZOLD M. Statistical modeling and analysis of mobile-to-mobile fading channels in cooperative networks under line-of-sight conditions [J]. International Journal Wireless Personal Communications, 2010, 54(1): 3-19.
[11] SEN S, XIONG J, GHOSH R, CHOUDHURY R R. Link layer multicasting with smart antennas: No client left behind [C]// IEEE International Conference on Network Protocols, Orlando, 2008: 53-62.
