Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Handoff Triggering and Network Selection Algorithms for Load-Balancing Handoff in CDMA-WLAN Integrated Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 136939 14 pages doi 2008 136939 Research Article Handoff Triggering and Network Selection Algorithms for Load-Balancing Handoff in CDMA-WLAN Integrated Networks Jang-Sub Kim Erchin Serpedin Dong-Ryeol Shin and Khalid Qaraqe Department of Electrical and Computer Engineering Texas A M University College Station TX 77843-3128 USA Correspondence should be addressed to Erchin Serpedin serpedin@ Received 28 November 2007 Revised 26 April 2008 Accepted 11 August 2008 Recommended by Yuh-Shyan Chen This paper proposes a novel vertical handoff algorithm between WLAN and CDMA networks to enable the integration of these networks. The proposed vertical handoff algorithm assumes a handoff decision process handoff triggering and network selection . The handoff trigger is decided based on the received signal strength RSS . To reduce the likelihood of unnecessary false handoffs the distance criterion is also considered. As a network selection mechanism based on the wireless channel assignment algorithm this paper proposes a context-based network selection algorithm and the corresponding communication algorithms between WLAN and CDMA networks. This paper focuses on a handoff triggering criterion which uses both the RSS and distance information and a network selection method which uses context information such as the dropping probability blocking probability GoS grade of service and number of handoff attempts. As a decision making criterion the velocity threshold is determined to optimize the system performance. The optimal velocity threshold is adjusted to assign the available channels to the mobile stations. The optimal velocity threshold is adjusted to assign the available channels to the mobile stations using four handoff strategies. The four handoff strategies are evaluated and compared with each other in terms of GOS. Finally the proposed scheme is