iPhone 3G Power Control

The first sensible explanation of what is going on with Iphone 3G. Basically, it has bad power management firmware when talking with the 3G network. Every phone in a cell has to have the new 2.0.2 firmware for drop calls and slow speed to get solved.

The Inside Deets on iPhone 2.0.2 and Dropped Calls — RoughlyDrafted Magazine

The iPhone 2.0.2 update “fixed power control on the mobile,” the source told RoughlyDrafted. UMTS, the technology used to deliver AT&T’s 3G network, refers to phones and other client devices as “UE” for user equipment, and the base transceiver station towers as “Node B.”

Why the iPhone 3G dropped call

“In UMTS,” the source said, “power control is key to the mobile and network success. If the UE requires too much downlink power then the base station or Node B can run out of transmitter power and this is what was happening. As you get more UEs on the cell, the noise floor rises and the cell has to compensate by ramping up its power to the UEs.”

“If the UE power control algorithm is faulty then they will demand more power from the cell than is necessary and with multiple users this can cause the cell transmitter to run out of power. The net result is that some UEs will drop their call.