WCDMA/HSDPA
- High Speed Packet Access (HSPA) is a amalgamation of two new
generation mobile telephony protocols: -
- High Speed Downlink Packet Access (HSDPA)
- High Speed Uplink Packet Access (HSUPA)
- HSPA Support speeds Up to 21 Mbps & also reduces latency.
- WCDMA is a 3G technology that supports only low 3G speeds, a
max of 384 Kpbs in a good coverage area,
- WCDMA devices provide a poor experience on the speeds as
compared to what 3G can actually deliver with HSPA devices.
HSDPA /. R-99
v
Main difference is in performance between R99 Packet and
HSDPA
v
R99 Packet service requires
dedicated channels whereas HSDPA users have a shared channel
v
Speeds of HSDPA are much
higher compared to 3G(R99). In real networks, an average HS subscriber gets around 5-8 times
throughput, compared to an R99 data user. We can easily say that an average HS
user can get between 1Mbps to 2Mbps whereas an average R99 user can get around
250- 280 kbps.
HSDPA has a
fixed spreading factor of 16. Multiple codes can be reserved for HSDPA at this
SF level and depending on the number of codes available, the speed varies.
Generally
operators reserve 5 or 10 codes per carrier (out of the 15 available) for HSDPA
service, which implies that these codes are not available for other R99
services like Speech, CS64 and PS
Point to
remember: Greater the number of codes you reserve for HS, lesser the Resources available for R99 services.
High Speed Uplink Packet Access (HSUPA)
is a Release-6 feature in 3GPP specifications and is part of HSPA (High Speed
Packet Access) family. by the technically aware people. The main aim of HSUPA
is to increase the uplink data transfer speed in the UMTS environment and it
offers data speeds of up to 5.8 Mbps in the uplink.
