Cross-Layer Resource Allocation for Variable Bit Rate Multiclass Services in a Multirate Multicarrier DS-CDMA Network
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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: [email protected]
Jon W. Mark Centre for Wireless Communications, Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1 Email: [email protected]
Kee-Chaing Chua Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260 Email: [email protected] 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 probability, variable bit rate multiclass services, round-robin carrier hopping, multirate multicarrier DS-CDMA, cross-layer coupling.
1.
INTRODUCTION
Connection-level resource allocation typically has new connection and handoff connection blocking probabilities, and forced termination probability of handoff connections as grade-of-service (GoS) measures. These system connections’ GoS metrics are collectively defined at the connection level. When traffic flows are admitted into the system, quality of service (QoS) is measured in terms of packet loss rate and/or packet delay. These packets’ QoS metrics are collectively defined at the packet level. Scheduling and statistical multiplexing gains play an important role in determining the amount of traffic that can be admitted into the system while still satisfying the packet-level QoS. Satisfying the connection-level GoS constraints alone may limit the packet-level traffic load
that can potentially be admitted into the system. Higher system utilization can be achieved by making use of both the connection-level and packet-level characteristics [1]. To our knowledge, Cheung and Mark [1] were
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