Institute of Electrical and Electronics Engineers Inc.;Los Alamitos: IEEE
摘要:
摘要： We investigate the multicast of layered multimedia content in single hop cognitive radio (CR) networks and ways of improving the subscriber utility. The proposed unified opportunistic scheduling (UOS) aggressively utilizes diversity potential present in CR by exploiting two types of multiuser diversity (MUD), one between multicast groups and another between data stream subscribers in a group. As a result, the resource usage efficiency is significantly increased, and better utility can be achieved. According to derived effective average subscriber throughput under unified MUD, a scheduling algorithm is designed to approach the theoretical throughput improvement. We specifically introduce controlled competition between multicast groups to balance the increasing resource efficiency and the risk of overstretching the limited available spectrum. The algorithm combines prioritization, rateless coding, and data fragmentation to inherently cope with dynamic spectrum availability in CR. The presented simulation results show improved performance in various situations in comparison to other schemes not taking full advantage of the present MUD potential. 其他題名： TMC 出版者： Los Alamitos: IEEE 出版日期： 2016-10-01 出處： IEEE transactions on mobile computing, 2016-10, Vol.15 (10), p.2627-2639 資源來源： IEEE Electronic Library (IEL) 版權： Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2016 識別號： ISSN: 1536-1233 識別號： EISSN: 1558-0660 識別號： DOI: 10.1109/TMC.2015.2499188 識別號： CODEN: ITMCCJ
