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Báo cáo hóa học: " Cross-Layer Resource Allocation for Variable Bit Rate Multiclass Services in a Multirate Multicarrier DS-CDMA Network"
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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: Cross-Layer Resource Allocation for Variable Bit Rate Multiclass Services in a Multirate Multicarrier DS-CDMA Network | EURASIP Journal on Applied Signal Processing 2005 2 183-192 2005 Hindawi Publishing Corporation Cross-Layer Resource Allocation for Variable Bit Rate Multiclass Services in a Multirate Multicarrier DS-CDMA Network Tung Chong Wong Institute for Infocomm Research Agency for Science Technology and Research 21 Heng Mui Keng Terrace Singapore 119613 Email wongtc@i2r.a-star.edu.sg Jon W. Mark Centre for Wireless Communications Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario Canada N2L 3G1 Email jwmark@bbcr. uwaterloo. ca Kee-Chaing Chua Department of Electrical and Computer Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260 Email chuakc@nus.edu.sg Received 28 July 2003 Revised 27 April 2004 An approximate analytical formulation of the resource allocation problem for handling variable bit rate multiclass services in a cellular round-robin carrier-hopping multirate multicarrier direct-sequence code-division multiple-access MC-DS-CDMA system is presented. In this paper all grade-of-service GoS or quality-of-service QoS requirements at the connection level packet level and link layer are satisfied simultaneously in the system instead of being satisfied at the connection level or at the link layer only. The analytical formulation shows how the GoS QoS in the different layers are intertwined across the layers. A novelty of this paper is that the outages in the subcarriers are minimized by spreading the subcarriers signal-to-interference ratio evenly among all the subcarriers by using a dynamic round-robin carrier-hopping allocation scheme. A complete sharing CS scheme with guard capacity is used for the resource sharing policy at the connection level based on the mean rates of the connections. Numerical results illustrate that significant gain in the system utilization is achieved through the joint coupling of connection packet levels and link layer. Keywords and phrases bit error rate outage .