High-Speed Packet Access
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High-Speed Packet Access (HSPA) is a collection of mobile telephony protocols that extend and improve the performance of existing UMTS protocols. Two standards HSDPA and HSUPA have been established and a further standard HSOPA is being proposed.
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[edit] Overview
The two existing standards (HSDPA and HSUPDA) in the family provide increased performance by using improved modulation schemes and by refining the potocols by which handsets and base stations communicate. These improvements lead to a better utilisation of the existing radio bandwidth provided by UTMS.
[edit] HSDPA
HSDPA provides improved down-link performance of up to 14.4Mbits/s theoritically. Existing deployments and handsets provide up to 3.6Mbit/s. Upload performance is a maximum of 384 Kbit/s per second.
[edit] HSUPA
HSUPA provides improved up-link performance of up to up to 5.76Mbits/s theoretically. No existing commerical deployments of HSUPA are in operation and no handsets have been released.
[edit] HSOPA
The HSOPA is currently under development, aiming for maximum transfer rates of 100Mbps for the down-link and 50Mbps for the up-link.
