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UMTS Networks : Architecture, Mobility and Services

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Evolution from GSM to <strong>UMTS</strong> Multi-access 27<br />

with real-time pictures. When these services become available to the public, air<br />

interface capacity will once more rear its head. In 3GPP R5 the HSDPA<br />

introduces capacity enhancement in the downlink direction. In order to use the services<br />

mentioned above, the uplink on the radio path will have to be able to carry more<br />

capacity. For this purpose, a feature called ‘‘High Speed Uplink Packet Access’’<br />

(HSUPA) is introduced.<br />

The third trend will be the ongoing development of harmonisation. For this purpose.<br />

3GPP is continuously working with study items related to multi-access <strong>and</strong> interworking<br />

arrangements between various access technologies.

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