High Speed Packet Access
High Speed Packet Access (HSPA ) is an extension of the UMTS mobile standard, which allows for higher data transfer rates. It is divided into HSDPA to increase the data rate of the downlink and HSUPA for the uplink.
Meanwhile, the next generation called HSPA was presented, which is part of the 3GPP specifications for Release 7 and other improvements made possible. According HSPA release 10 downstream speeds of up to 168 Mbit / s are provided. In some German and Swiss mobile networks are currently using HSPA speeds up to 42 Mbit already / s available (as of January 2012). The goal was to improve the efficiency, that is, spectral efficiency, maximum data transfer rates and delay times to improve.
The key features of HSPA 3GPP Release 7 are:
- Multiple Input Multiple Output (MIMO) in the downlink
- Higher order modulation for the uplink ( 16QAM ) and downlink ( 64QAM )
- Enhanced Layer 2 support for higher downlink rates
- Enhanced CELL_FACH state ( downlink), Continuous Packet Connectivity ( CPC)
- Enhanced Fractional DPCH (F- DPCH)
The key features of HSPA in 3GPP Release 8 are:
- The combination of MIMO and 64QAM
- CS over HSPA
- Dual Cell HSDPA
- Enhanced Layer 2 support for higher uplink rates
- Enhanced CELL_FACH state for the uplink