There can be three types
of GPRS mobile phones based on the possibility
of of simultaneous calls (via GSM) and
data transmission (via GPRS).
- Class A - Simultaneous
calls (via GSM) and data transmission
(via GPRS)
- Class B - Automatic
switching between the GSM and the
GPRS mode is possible according to
telephone settings.
- Class C - Hand operated
switching between the GSM and the
GPRS mode The supported data transmission
speed per channel is 13.4Kbits. Depending
on the type of phone, the following
data transmission speeds are theoretically
possible...
These phones can also
be classified on the basis of number
of channels they use for data transmission.
- Type 2+1 - two downlink
channels and one uplink data transmission
channel
- Type 3+1 - three
downlink channels and one uplink data
transmission channel
- Type 4+1 - four downlink
channels and one uplink data transmission
channel
