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Mobile telephone with pager mode
| Details |
Inventors: Heatley, David J;
Assignee: British Telecommunications (London, GB)
Primary Examiner: Appiah; Charles N.
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye P.C.
A mobile telephone is arranged to detect when its battery voltage has fallen such that only the lowest segment of the four segment battery charge level bar of its LCD display is showing, and, in response, to transmit a "Restricted Delivery Mode" message to a predetermined network destination number, and then to disable its transmit function. An audio signal is generated to alert the user, and a warning message is displayed, e.g., Battery Low, Message Mode, Restricted Delivery Mode" is a selectable option via the telephone's menu. The mobile network, upon receipt of such a "Restricted Delivery Mode" message, sets a "Restricted Delivery Mode" flag in the user's profile. For an originating call the profile is accessed in the normal manner, and, if that flag is set, the network sends, e.g., a "Receive Only--Leave Message" announcement to the caller. |
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DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS In this description the following acronyms are used:-- BSS--Base Switching Subsystem CLI--Calling Line Indication, also known as Calling Line Identity, FET--Field Effect Transistor GPRS--General Packet Radio Service GSM--Global System for Mobile Communications (Groupe Speciale Mobile) HLR--Home Location Register IVR--Interactive Voice Response LCD--Liquid Crystal Display MSS--Mobile Switching Subsystem NSS--Network Switching Subsystem OSS--Network Switching Subsystem SMS--Short Message System VLR--Visitor Location Register In FIG.
1 there is shown a mobile telephone 10 having a battery 12, and a battery voltage sensing circuit 14 providing an output signal to a control unit 16 which provides drive signals to an LCD screen 18.
Depending upon the output signal of the voltage sensing circuit 14, the control unit 16 commands the display of a four segment battery voltage indicator, commonly known in the art as a battery charge level bar.
If the battery is fully charged then all four segments show, and as the battery discharges then the segments are "extinguished", one by one, starting at the fourth (top) segment, until low battery voltage is reached and only the first segment is shown, referred to herein as the mobile telephone being in low battery condition, and finally when the battery voltage becomes too low to power the mobile telephone 10 the first segment is extinguished and he mobile telephone switches itself off.
The mobile telephone 10 also has other components, including an aerial 20, a receive circuit 22 a transmit circuit 24, and a keypad 26.
In addition to controlling the mobile telephone 10 in conventional manner, the control unit 16 of this embodiment is arranged to respond to the "extinction" of the next-to-last segment to transmit a "Delivery Mode--Message Only" message to a Network Switching Subsystem (NSS) 36 of a GSM network 30 (see FIG.
2) to inform it that that the mobile telephone 10 has a low battery condition and that the delivery mode for calls to that mobile telephone 10 is to be changed from Normal to Message Only in the manner described below
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