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...

Examples

Embodiment Construction

[0020] Figure 1 depicts a dual-mode system wireless handset 2 located in a cell 10 of a cellular telephone system and also in a coverage area 11 of a short-range wireless system such as "Bluetooth" or "Wi-Fi" (802.11). It should be understood that the coverage areas 10 and 11 do not have clearly defined boundaries, but rather their extent is determined by factors such as signal quality, either absolute or relative to each other, wherein the signal quality varies with distance as shown in FIGS. 3 to 5 , Figures 3 to 5 are time plots of the signal quality measured by a mobile phone moving in the area shown in Figure 1.

[0021] As shown in Figure 2, the mobile handset 2 comprises an earphone 20 and a microphone 21, which provide conversion between audio signals and electrical signals. Electrical signals to and from these components are controlled by call control system 22 which performs analog-to-digital conversion and other processing to enable calls over the telephone system. ...

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...

Examples

Embodiment Construction

[0020] Figure 1 depicts a dual-mode system wireless handset 2 located in a cell 10 of a cellular telephone system and also in a coverage area 11 of a short-range wireless system such as "Bluetooth" or "Wi-Fi" (802.11). It should be understood that the coverage areas 10 and 11 do not have clearly defined boundaries, but rather their extent is determined by factors such as signal quality, either absolute or relative to each other, wherein the signal quality varies with distance as shown in FIGS. 3 to 5 , Figures 3 to 5 are time plots of the signal quality measured by a mobile phone moving in the area shown in Figure 1.

[0021] As shown in Figure 2, the mobile handset 2 comprises an earphone 20 and a microphone 21, which provide conversion between audio signals and electrical signals. Electrical signals to and from these components are controlled by call control system 22 which performs analog-to-digital conversion and other processing to enable calls over the telephone system. ...

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