Separable cellular telephone and method for operating the same

Details Separable cellular telephone and method for operating the same Separable cellular telephone and method for operating the same

1998-08-13

2001-04-10

Le, Thanh Cong (Department: 2749)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S092000, C455S575100, C455S556200

Reexamination Certificate

active

06216017

ABSTRACT:

BACKGROUND
1. Technical Field
The present application relates generally to a cellular telephone and, in particular, to a cellular telephone which can be separated into a main device and a remote device, and a method for controlling communication between the separated devices.
2. Description of the Related Art
A cellular telephone independently interchanges an RF (Radio Frequency) signal with a cell site (or base station) to provide a call service, as shown in
FIG. 1. A
conventional cellular telephone includes an RF transmitter and a signal processor, and performs data communication with the cell site to form a radio link to provide call service via the radio link. In general, a conventional cellular telephone is too large in size to be placed in a user's pocket. Consequently, a user will typically place the cellular telephone in a handbag, or simply hold it in hand. When the cellular telephone is placed in a handbag, however, the user must take it out of the handbag to either make or answer a call. Moreover, when the cellular telephone is in a silent (or vibration) mode, the user may not be aware of an incoming call. Furthermore, when the user holds the cellular telephone, it can easily be lost or damaged due to carelessness.
SUMMARY OF THE INVENTION
The present application is directed to a cellular telephone having a main device and a remote device having a call service function, and a method for controlling radio communication between the two devices. The main device of the cellular telephone includes a first radio circuit for communicating with a cell site and a second radio circuit for communicating with the remote device. The remote device includes a radio circuit for communicating with the second radio circuit of the main device when the remote device is separated from the main device.
In one aspect, a separable cellular telephone comprises:
a main device having a first radio circuit for communicating with a cell site and a second radio circuit; and
a remote device having a radio circuit for communicating with the second radio circuit of the main device, wherein upon receipt of an incoming call from the cell cite, the main device transmits call receipt information to the remote device and the remote device processes the incoming call.


REFERENCES:
patent: 5493703 (1996-02-01), Yamashita
patent: 5809432 (1998-09-01), Yamashita
patent: 5924044 (1999-07-01), Vannatta et al.
patent: 5960367 (1999-09-01), Kita

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