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Hierarchical SIR and Rate Control on the Forward Link for CDMA Data Users under Delay and Error Constraints

By Lei Song and Narayan B. Mandayam

Abstract

In this paper, we study SIR and rate control for CDMA data users on the forward link under average or peak power constraints. The QoS for data users is specified by delay and error rate constraints as well as a family of utility functions representing the throughput and fairness among the data users. It is found that the optimal SIR and rate control algorithm has an hierarchical structure which can be easily implemented in a distributed manner. The SIR targets can be adjusted independently by the mobiles using information specific to the individual users. The data rates can be adjusted jointly by the base station based on limited feedback from the mobiles. We also propose a 2-level iteration algorithm for both the mobile and the base station to efficiently compute the SIR and data rates. Our results show that a flexible tradeoff between total system throughput (sum of rates achieved) and fairness (similarity in data rates) can be achieved by choosing appropriate utility functions used in ..

Topics: Wireless Data, CDMA, Rate and SIR Control, Hierarchical Architecture
Year: 2000
OAI identifier: oai:CiteSeerX.psu:10.1.1.32.7207
Provided by: CiteSeerX
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