>Achieving the theoretical maximum GPRS data transmission speed of 172.2 kbps would require a single user taking over all eight timeslots
>without any error protection.
Exactly, the original design criteria, known since late 70s.
(although one funny thing is that the FSK used in GSM has
an inbuilt forward error protection, although being
optimal for battery life is more important)
> Clearly, it is unlikely that a network operator will allow all timeslots to be used by a single GPRS user.
Not at all unlikely. (Sonera already gets rid of
the last telephone poles in Finland and installs
GSM based phones for the same monthly, etc fees as
for wired phones)
> Additionally, the initial GPRS terminals are expected be severely limited- supporting only one, two or three timeslots
Not limited at all, but exactly as the the system has been
designed, long time ago.
>The bandwidth available to a GPRS user will therefore be severely limited
No, it will be the same 200kHz used for ages.
> As such, the theoretical maximum GPRS speeds should be checked against the reality of constraints in the networks and terminals.
What do you mean "should be checked", it has been checked
long time ago. Many, many moons has passed since that,
much more than you have fingers and toes.
Ilmarinen.
P.S. Why is GPRS so difficult to understand, one only need
to process two-three factors at the same time, not even
all other users nor soft-hand-offs?
And the GSM operators have even more many, many moons of
actual dynamic field experience from their networks, huge
amounts of data. (Ever put a GSM phone in field
engineering mode??) |
