Answer:

Power control:

Power control is the intelligent selection of transmitter power output in a communication system to achieve good presentation within the system. It is the technical mechanism used within some networking devices in order to prevent too much unwanted intrusion between the different wireless networks. The ideas of the mechanism is to automatically reduce the used transmission output power when other networks are within range. Reduced power means reduced intrusion problems and increased battery capacity.

• Power control is one of the main qualities in 3rd generation cellular CDMA systems. Power control reduces the intrusion in the system and thus increases the capacity. The basic task of power control implementation in 3G CDMA systems.
• The inner loop and the outer loop algorithms are explained where the power commands are sent at a high rate and un-coded resulting in high error rate in receiving them. The problem of errors in the power control commands becomes worse during soft handoff where the terminal communicates with more than one base station at the same time. As we know, cdma2000 and W-CDMA both referred to the multicarrier mode.

• The power control is used in cdma2000 and W-CDMA because it effects the presentation of cdma2000 and W-CDMA in three ways that are:

   

1. It reimburse for fast fading
2. reimbursement of fading channel leads to peaks in MS transmission power which effect the intrusion.
3. Neglect near far problems in the uplink.