Abstract
This chapter discusses the evolution of wideband code division multiple access (WCDMA). The first step in the evolution of WCDMA radio access is the introduction of high-speed downlink packet access (HSDPA) in Release 5 of the 3GPP/WCDMA specifications. Although packet-data communication is supported already in the first release of the WCDMA standard, HSDPA brings further enhancements to the provisioning of packet-data services in WCDMA. The downlink packet-data enhancements of HSDPA are complemented by Enhanced Uplink. HSDPA and enhanced Uplink are often jointly referred to as “high-speed packet access (HSPA).” WCDMA is a versatile and highly flexible radio interface that can be configured to meet the requirements from a large number of services. However, the chapter focuses on the functionality commonly used to support packet-data transmissions. Moreover, the intention of this chapter is to provide the reader with an understanding of the foundation upon which HSPA and Multimedia Broadcast Multicast Services (MBMS) are built.
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