Multi mode mobile terminal using different scanning rates

Abstract

A mobile handset capable of operation on more than one wireless system has means for periodically testing for the availability of at least one system whilst operatively connected to another system, wherein the periodicity of the testing process is made at one rate when a call is in progress and at a second rate when no call is in progress (on standby). This significantly reduces power consumption when on standby, without impairing handover reliability if a call is in progress.

Description

technical field [0001] The present invention relates to mobile telephone handsets. Background technique [0002] mobile telephone handset is designed to communicate with a communication network by using a wireless connection (usually radio) to a fixed base station which communicates with a network switching system with another switching system connected to the same switching system or which is interconnected with the base station communicate with any other phone. [0003] So-called "cordless" handsets are designed to work only with dedicated base stations. In some systems, private base stations may change from time to time, but not during a call. "Cellular" handsets, on the other hand, are capable of working with any of a large number of base stations. Typically, the base station with the strongest signal detected by the mobile handset communicates with the handset. Unlike cordless systems, a cell phone can change its communication path from one base station to another d...

AI Technical Summary

Problems solved by technology

However, the power consumed by the test processing is significant relative to the power consumed when the phone is not on a call and remains powered on to respond to an incoming call (a state commonly referred to as "standby")

So the sampling process will consume a lot of battery life while the phone is in standby and cause an unacceptable reduction in the time the phone is in that state between recharges

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