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3G Evolution, 2nd Edition by Per Beming, Johan Skold, Stefan Parkvall, Erik Dahlman

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Chapter 10. Enhanced Uplink

Enhanced Uplink, also known as High-Speed Uplink Packet Access (HSUPA), has been introduced in WCDMA Release 6. It provides improvements in WCDMA uplink capabilities and performance in terms of higher data rates, reduced latency, and improved system capacity, and is therefore a natural complement to HSDPA. Together, the two are commonly referred to as High-Speed Packet Access (HSPA). The specifications of Enhanced Uplink can be found in [101] and the references therein.

10.1. Overview

At the core of Enhanced Uplink are two basic technologies used also for HSDPA –fast scheduling and fast hybrid ARQ with soft combining. For similar reasons as for HSDPA, Enhanced Uplink also introduces a short 2 ms uplink TTI. These ...

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