3G Evolution of HSPA
HSPA - Introduction
HSPA, which means of High Speed Packet Access and it is the
combination of two mobile telephony protocols, High Speed Downlink
Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA),
that extends and improves the performance of existing 3G mobile
telecommunication networks utilizing the WCDMA protocols.
HSPA evolution first introduced downlink part called HSDPA in
Release 98, Uplink evolution followed later in Release 99 by the name
Requirements of HSPAData Rate
- Demand for higher peak data rates.
- Lower latency.
- Better capacity and throughput.
- Better spectrum efficiency.
- Finer resource granularity.
- Better coverage for higher data rate.
FEATURESHSPA improves the end-user experience by:
Increasing peak data rates to 14.4 Mbps in the downlink and 5.8
Mbps in the uplink.
Link adaptation in downlink.
TECHNOLOGIES USEDShared-channel transmission, which results in efficient use of
available code and power resources in WCDMA.
A shorter Transmission Time Interval (TTI) , which reduces roundtrip time and improves the tracking of fast channel variations.
Link adaptation, which maximizes channel usage and enables the
base station to operate at close to maximum cell power.
MIMO, which exploits antenna diversity to provide further
improvements in bit-rates and system capacity.
HSPA PEAK DATA RATESDownlink
Theoretical up to 14.4 Mbps
Initial capability 1.8 – 3.6 Mbps
# of codes Modulation
Theoretical up to 5.76 Mbps
Initial capability 1.46 Mbps
# of codes
2 x SF4
2 x SF2
2 x SF2
2 x SF2 +
2 x SF4