Intelligent network searching for a multi mode phone

Details Intelligent network searching for a multi mode phone Intelligent network searching for a multi mode phone

1998-02-04

2001-05-01

Urban, Edward F. (Department: 2683)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S462000, C455S558000, C455S552100

Reexamination Certificate

active

06226527

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a dual mode phone capable of establishing a connection to at least one cellular network or at least one cordless network, said phone continuously monitoring system information messages from said at least one cellular network and said at least one cordless network to maintain an idle mode connection.
Users demand long standby times, because they find it cumbersome to have to recharge their portable telephone more than a couple of times a week. The manufacturers have worked intensely on reducing the energy consumption which is of no use to the user. Portable cellular telephones have many advantages, as they offer great mobility, which also applies to data transmission, good speech quality and good data safety (which applies to digital systems in particular).
If the advantages of cellular networks are to be utilized in office environments and the like, this may take place e.g. via cordless systems, such as DECT. To avoid having to equip the staff with both a cordless telephone and a cellular telephone, it is attempted to integrate the two types in a so-called dual mode telephone, where the telephone in idle mode (ready to receive ingoing calls and to establish outgoing calls) continuously monitors the system information messages of the two networks. This requirement of continuous monitoring may have as a result that the telephone consumes energy in searching for a network, e.g. the DECT network, even though the telephone is outside the area covered by the network.
SUMMARY OF THE INVENTION
In accordance with this invention there is provided a method for use in network searching for a dual or multi mode telephone, capable of establishing a connection to at least one cellular network or at least one cordless network, said telephone monitoring system information messages from said at least one cellular network and/or said at least one cordless network to maintain an idle mode connection, said method comprising obtaining cell identification information about the cell in the cellular network concerned serving the telephone, comparing this cell identification information with cell identification information about the cells in the cellular network where the telephone is expected to be covered by said at least one cordless network, and enabling/disabling the cordless part of the telephone in dependence on said comparison.
The telephone is hereby capable of determining its own position on the basis of information from the cellular network and comparing this position with a geographical area usually covered by a cordless network. If the telephone is outside this area, the cordless part of the telephone is automatically disabled.
This disabling may be indicated to the user so that if he considers the disabling to be wrong, it can be manually overruled. The group of cellular cells providing cordless coverage can hereby be updated.
Thus, a dual or multi mode telephone capable of intelligently shutting down the paging activity when this serves no purpose is provided.
The invention also relates to a dual or multi mode telephone capable of establishing a connection to at least one cellular network or at least one cordless network, said telephone continuously monitoring system information messages from said at least one cellular network and said at least one cordless network to maintain an idle mode connection, said telephone comprising first memory means for storing cell identification information about the cell in the cellular network concerned covering the telephone, second memory means for storing cell identification information about the cells in the network where the telephone has previously been covered by said at least one cordless network, means for comparing the present cell identification information with the cell identification information stored in the second memory, and means for enabling/disabling the cordless part of the telephone in dependence on said comparison.
The invention also relates to a dual mode telephone having means for sensing a mechanical interconnection between the telephone and predetermined accessory parts for enabling/disabling the cordless part of the telephone in dependence on said sensing, thereby overruling the cell identification information based enabling/disabling of the cordless part of the telephone. The telephone can hereby detect when it is placed e.g. in a car kit. The DECT system, e.g., requires that the telephone be moved only slowly. If a DECT telephone is placed in a car which begins driving, the telephone will be cut off because of fading caused by multi path propagation.


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GSM, ETS 300 523, paragraph 4.2.1.

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