User Guide

CC Technical Documentation System Module

NPM-10 (3595)

GPRS Requirements

GPRS Dual Slot

The power level transmitted by the base station will not be the same in all RX slots seen

from the mobile phone. Each block interleaved on four time slots will be transmitted on

the same level from the base station. In single RX slot operation, this means that four

successive time slots will receive a signal on the same level if we ignore fading. The

following block (four time slots) can then change up to 6 dB – even if the second

package (block) is for the same mobile phone.

Figure 14: Single RX slot operation

The 6 dB step is also seen in dual slot operation. Here the change can be seen between

two neighbor slots.

Figure 15: Dual RX slot operation

The NPM-10 (3595) support Class 4 GPRS uses one TX slot. This means that there is no

difference between normal GSM and the GRPS on the transmitter.

Synthesizer

The synthesizer requirements in GPRS are equivalent to HSCSD requirements and are

limited to faster PLL settling time compared to single-slot operation.

TDMA

frame nr

Time Slot

RLC/MAC

block

B0 B1 B2 ...

Received

power

...