With the growing need of high rate data services, 3GPP standard has investigated ways to support multimedia services with multi-carrier transmissions. Supporting high data rate guaranteeing the quality of service (QoS) and fairness of users is an important issue and should be addressed in an advanced wireless system. This paper investigates packet scheduling considering QoS of real-time traffic and fairness of non-real-time traffic through fixed delay adjustment based on multi-user PF scheduling in a dual-carrier (DC) HSDPA system. The proposed algorithm results in the QoS improvement of real-time traffic and fairness of non-real-time traffic, and the decrease of average sector throughput due to tradeoff between throughput and fairness.

Many techniques for calculating bit-error probabilities (BEPs) of direct-sequence spread-spectrum multiple-access systems (DS-SSMA) have been reported. Among them are the following three techniques: (1) the standard Gaussian approximation; (2) the improved Gaussian approximation; (3) and the simplified improved Gaussian approximation. We extend these techniques to derive the BEPs of multicode DS-SSMA systems. We assess the three techniques by comparing their results with the result of computer simulation.

We propose a hybrid channel assignment (HCA) scheme in DS-CDMA systems for accommodating integrated voice/data traffic and the required power levels of voice and data traffic are derived. These levels can be used to maintain the required link qualities of all calls. In the proposed scheme, delay-sensitive voice traffic is accommodated in a circuit mode and delay-nonsensitive data traffic is accommodated in a packet mode. The proposed scheme can achieve a high link efficiency with the reduced control overhead by statistically multiplexing voice and data traffic.

Since mobile user mobility behaviors can vary according to time periods, e.g. office-going/closing and office hours, the location management traffic load for tracking user positions is also a function of time. The transient characteristics of location management traffic vary according to users' initial starting positions. In this paper, we propose a mobile user mobility model considering office-going/closing and office hours for evaluating the effect of user mobility on the performance of mobile networks. We analyze the transient characteristics of a mobile network in terms of the mean location update rate.