Abstract
This chapter discusses enhanced uplink , also known as high-speed uplink packet access (HSUPA), that provides improvements in wideband code division multiple access (WCDMA) uplink capabilities. It also improves the performance in terms of higher data rates, reduced latency, and improved system capacity, and is therefore a natural complement to high-speed downlink packet access (HSDPA). Together, the two are commonly referred to as high-speed packet access (HSPA). The chapter provides a high-level overview of the feature, which is used to get a quick understanding of how HSPA and enhanced uplink work. The overview is followed by a description on how the key technologies have been integrated into WCDMA and why certain solutions were chosen. At the core of Enhanced Uplink are two basic technologies used also for HSDPA—fast scheduling and fast hybrid automatic repeat request (ARQ) with soft combining. The chapter discusses the basic differences between HSDPA and enhanced uplink.
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