Performance enhancements of high-speed packet data service using transmission scheduling in an integrated voice/data CDMA system

Abstract

One of the distinct objectives of IMT-2000 systems is to support high speed packet data traffic in a mobile personal communications service(PCS) network. The expected growth in demand for data services in addition to the growth in circuit-switched voice traffic requires air interface designs with very high spectral efficiency. To support high speed packet data service, physical layer designs need to utilize advanced coding, modulation, and diversity schemes with enhanced access, power, and interference control mechanisms. Also, resource management with enhanced media access control needs to be devised to support most efficiently various types of concurrent circuit and packet switched data with different quality of service(QoS) and timing requirements. In this thesis, we focus on resource allocation schemes for high speed packet data service in an integrated voice/data CDMA system. One approach of resource management for high speed packet data service is to schedule the transmission of data traffic so as to avoid intracell interference. Another more complex approach is to reduce intercell interference. The main idea is that the throughput can be increased with lower interference. First, we analyze the performance of a simultaneous resource allocation(SRA) scheme and a dedicated resource allocation(DRA) scheme in the reverse link of an integrated voice/data CDMA system. In the DRA scheme, the throughput of data users can be maximized when one user among data users is allowed to transmit information at any given time. Using the DRA scheme, resources for data users are allocated with high spectral efficiency. To apply this scheme to an integrated voice/data CDMA system, resources are first allocated to voice users and then residual resources are allocated to data users based on the throughput maximization strategy. For more practical approach, the transmission power of mobile stations is assumed to be limited. Due to this assumption, the performance of SRA and DRA ...