Class I Class II - A Class II

Addressed is the uplink access control problems for cellular CDMA systems that service heterogeneous traac with various types of quality-of-service (QoS) and use Multi-Code CDMA (MC-CDMA) to support variable bit rates. Considering its distinct QoS requirements, class-I real-time traac (e.g., voice and video) is diierentiated from class-II non-real-time traac (e.g., data). Connection-oriented transmission is achieved by assigning transmitter-oriented code channels for class-I traac where each corresponding mobile client needs to pass an admission test. Class-II traac is transmitted in a best-eeort manner using the bandwidth left unused by class-I traac and a transmission-rate request access scheme: whenever a mobile has class-II messages to transmit, the mobile requests code channels via a receiver-oriented transmission-request code channel, then, according to the base station scheduling, the transmission is scheduled and permitted. Addressed are the admission test for class-I connections, power control, and how to maximize the aggregate throughput for class-II traac. The admission region of voice and video connections and the optimum target signal-to-interference ratio (SIR) of class-II traac are derived numerically. The performance of class-II traac transmissions in terms of average delay is also evaluated and discussed based on simulations.