B.5 Example

05.083GPPRadio subsystem link controlTS

Figure B.1 illustrates an example of the uplink power control function.

In packet idle mode, the MS measures the C value on each monitored PPCH block. Meanwhile, the BSS measures the interference of the candidate PDCHs in order to have CH values ready for the first transfer period. This is transferred to the MS in the Packet Uplink Assignment.

In packet transfer mode, the MS measures the C value on the BCCH carrier and updates its output power. The BSS updates the MS specific CH values and transfer them to the MS when needed, i.e. when the interference level has changed.

Figure B.1: Traffic example of uplink power control

Figure B.2 illustrates an example of the downlink power control function.

In packet idle mode, the MS measures the C value on each monitored PPCH block and the CH values on some candidate PDCHs.

In packet transfer mode, the MS measures the C value on the BCCH carrier and the CH values on all channels on the same carrier as the assigned PDCH. These values are transferred to the BTS in the Packet Downlink Ack/Nack messages. The BSS then updates the output power.

The BTS may use the maximum power for the first transfer period and set the polling for Ack/Nack as soon as possible to get the values measured in packet idle mode.

Figure B.2: Traffic example of downlink power control