B.1 Open loop control

05.083GPPRadio subsystem link controlTS

A pure open loop is achieved by setting  = 1 and keeping CH constant. The output power will than be:

P = 0 – CH – C – 48

The value CH can be calculated as follows to give a target value for the received signal, SSb, at the BTS.

The received signal level at the MS: SSm = PBTS – Pb – L

where PBTS = BTS maximum output power Pb = BTS power reduction due to power control L = path loss

The C value (normalised received signal level): C = SSm + Pb = PBTS – L

The MS output power: P = 0 – CH – C – 48 = 0 – CH – PBTS + L – 48

The received signal level at the BTS: SSb = P – L = 0 – CH – PBTS – 48

The constant value of CH: CH = 0 – PBTS – SSb -48