CA2370552A1

CA2370552A1 - A fixed cellular terminal system and method of using the same

Info

Publication number: CA2370552A1
Application number: CA002370552A
Authority: CA
Inventors: Hussein Alayan
Original assignee: Individual
Current assignee: Ericsson Inc
Priority date: 1999-04-15
Filing date: 2000-04-05
Publication date: 2000-10-26
Also published as: BR0009792A; AU4073200A; WO2000064200A1

Abstract

A system, and method of, using a radio transceiver within a fixed cellular terminal system as a component of a line interface system for communication from a DMTF unit, and also as a conventional portable cellular telephone is disclosed herein. The fixed cellular terminal system includes the line interface system, the radio transceiver, and a docking mechanism for connection of the radio transceiver to the line interface system. The line interface system includes a line interface controller and a power supply. The line interface controller is capable of providing a connection between a DTMF
telecommunication unit and a cellular network. The radio transceiver connects the line interface system to a cellular network, and may also be used as a portable cellular telephone. The docking mechanism connects the radio transceiver to the line interface system in order to connect the line interface controller to the cellular network. The docking mechanism also allows for the radio transceiver to receive power from the power supply of the line interface system.

Description

A FIXED CELLULAR TERMINAL
SYSTEM AND METHOD OF USING THE SAME
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to fixed cellular terminal systems. More specifically, the present invention relates to a system and method for allowing use of a cellular telephone in conjunction with a fixed cellular terminal system.
Description of the Related Art In many locations in the world, people are forced to either do without or wait long periods for standard telephone service due to a lack of a wire telephone infrastructure. Such is the case in many remote locations, and in markets that cannot support or justify the investment in a wire telephone infrastructure.
One solution to such a problem is a fixed cellular terminal system that provides standard telephone service by combining an analog telephone and a cellular communications device to provide telephone service over a cellular network.
A fixed cellular terminal system is available from the assignee herein.
The system includes a single line module and a power supply with a battery backup unit. The system is intended to be installed in a consumer's home or office.
The single line module includes a line interface controller and a radio transceiver. The line interface controller makes it possible to use multiple dual tone multi-frequency ("DTMF") telecommunication units at a single location. The DTMF
telecommunication units may be telephones, facsimile machines, or modems. The DTMF units are connected to the line interface controller via the single line module using ordinary telephone jacks. The radio transceiver provides the interface to the cellular network. The radio transceiver is similar to a conventional cellulartelephone, only it has modified software to perform the interface with the line interface controller.
The interface to the cellular network conforms to cellular telephony standards, through normal operation of the radio transceiver. The system generates ringing, signal, dial, congestion, holler and any other needed tone to the DTMF units.
The .~ CA 02370552 2001-10-15 00-04 _00 i Pg03b2-I~rVO US 000009019

2 line interface controller also converts tone into a serial data stream, and sends the data to the radio transceiver. The system may also include an echo canceler and metering functionality to support pay phone functionality.
However, one major limitation in a fixed cellular terminal system is the inability to use the radio transceiver as a conventional portable cellular telephone.
Thus, if a consumer of the fixed cellular terminal system desired to also have a conventional portable cellular telephone, the consumer would need a separate subscription to the cellular telephone network. PCT Publication WO 98147300 (published 22 October 1998) and EP-A-0 863 648 disclose cellular terminals used in fixed locations.
BRIEF SUMMARY OF THE INVENTION
One aspect of the present invention is a fixed cellular terminal system for utilization of a DTMF telecommunication unit and a conventional portable cellular telephone in a cellular network. The system includes a line interface system, a radio transceiver and a docking mechanism. The line intertace system includes a line interface controller. The line interface controller is capable of providing a connection between a DTMF telecommunication unit and a cellular network. The radio transceiver connects the line interface system to a cellular network, and may also be used as a conventional portable cellular telephone. The docking mechanism connects the radio transceiver to the line interface system. A detector detects a connection from the line interface controller to the radio transceiver, with the line interface controller Is adapted to activate the cellular telephone speaker and microphone when the detector detects that the radio transceiver has been disconnected from the docking mechanism while the system is in a conversation mode.
The radio transceiver may be capable of operating in a fixed mode for connection of a DTMF telecommunication network with a cellular network, and a portable mode for use as a conventional portable cellular telephone. The radio transceiver may also be capable of detecting if power is being supplied to the radio AMENDED SHEET

Oo-04-~OOi P ;; 0362-WO US 000009019

3 transceiver by the power supply of the line interface system. The fixed cellular terminal system may also be capable of switching between use of a DTMF
telecommunication unit and the radio transceiver as a conventional cellular telephone during a telephone conversation over the cellular network. The DTMF
telecommunication unit may be selected from the group consisting of telephones, modems, and facsimile machines.
Another aspect of the present invention is a radio transceiver capable of utilization with a fixed cellular terminal system as a component of a fine interface system of the fixed cellular terminal system and also as a stand alone conventional portable cellular telephone. The radio transceiver is capable of detecting communications from the line interface controller. The radio transceiver may provide connection to a cellular network for a DTMF telecommunication unit connected to the line interface system. The radio transceiver may also be capable of switching from a fixed mode to a portable mode during a conversation. The radio transceiver may function as one of a digital cellular telephone and an analog cellular telephone. A
cellular telephone speaker and cellular telephone microphone may be activated when the transceiver detects that the radio transceiver has been disconnected from the docking mechanism while the system is in a conversation mode.
Another aspect of the present invention is a method of using the radio transceiver in a fixed cellular terminal system in a cellular network. The radio transceiver is operable in one of a fixed mode by interfacing with one of a modem, telephone, or facsimile machine through the radio transceiver to a cellular network and a portable mode as a conventional cellular telephone using the cellular network.
The radio transceiver may be changed to the other of the fixed mode and the portable mode. Changing the operation from the fixed mode to the portable mode when in a conversation mode may include activating a speaker and microphone on the cellular telephone. The method may also include placing the radio transceiver in a conversation mode and changing the operation of the radio transceiver to the other of the fixed mode and the portable mode while maintaining the radio transceiver in the conversation mode. The method may also include verifying the AMENDED SHEET

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4 supply of power to the radio transceiver. The method may also include verifying a communication fink between the line interface controller and the radio transceiver at predetermined time intervals. The method may also include switching from the fixed mode to the portable mode if a communication link between the fine interface controller and the radio transceiver has been terminated. The method may also include inquiring if the radio transceiver is in a conversation mode or in idle mode.
The method may also include charging the radio transceiver when the radio transceiver is in the fixed mode.
BRIEF DESCRIPTION OF THE DRAWINGS
There is illustrated in Figure 1 a block diagram of a fixed cellular terminal system of the present invention with multiple DTMF telecommunication units that may include telephones, facsimile machines and modems.
There is illustrated in Figure 1A a block diagram of an alternative embodiment of the fixed cellular terminal system of the present invention with multiple DTMF telecommunication units that may include telephones, facsimile machines and modems.
There is illustrated in Figure 2 a flow chart of the logic in determining whether to operate the fixed cellular terminal system in a fixed mode through use of the DTMF units, or in a portable mode through use of the radio transceiver as a conventional cellular telephone when the radio transceiver is in an idle mode, wherein it is waiting for a telecommunication.
There is illustrated in Figure 3 a flow chart of the communication sequences between the radio transceiver and the line interface controller of the fixed cellular terminal system to determine if the fixed cellular system should operate in the fixed mode or the portable mode.
There is illustrated in Figure 4 a flow chart of the logic in determining whether to operate the fixed cellular terminal system in a fixed mode through use of the DTMF units, or in a portable mode through use of the radio transceiver as a AMENDED SHEET

06-0.4-?001 p;l p3g2_~O US 000009019 conventional cellular telephone when the radio transceiver is in a conversation mode, in which a telecommunication is occurring over the cellular network.
There is illustrated in Figure 5 a block diagram of the interface, via a docking mechanism, between the radio transceiver and the line interface system.
. 5 DETAILED DESCRIPTION OF THE INVENTION
As shown in Figures 1 and 1A, a fixed cellular terminal system of the present invention is generally designated 20. The system 20 includes a line interface system 22, a radio transceiver 24, a computer 26 and a docking unit 28.
A plurality of DTMF telecommunication units 30a-a (modern 30a; telephones 30b-30d; and Fax Sae) are connected to the line interface system 22. The line interface system 22 includes a line interface controller 31, a power supply 32 with a backup battery 34, and an indoor antenna 36. The docking unit 28 provides connection between the radio transceiver 24 and the line interface system 22.
As shown in Figure 1 A, the docking unit 28a may be an integrated component of the line interface system 22. The radio transceiver 24 may be used as a conventional portable cellular telephone when it is not connected with the docking unit 28, 28a.
However, when the radio transceiver 24 is connected~to the docking unit 28,28a, the DTMF units 30a-e may use the same telephone number as the radio transceiver 24 through their connection via the fine interface system 22. The computer 26 is used to program and reprogram the line interface system 22 and, if necessary, the radio transceiver 24.
The radio transceiver 24 is programmed to recognize when it is being used in a portable mode as a conventional portable cellulartelephane, and in a fixed as a component of the line interface system 22. The fixed mode is similar to the fixed mode of the current fixed cellular terminal systems of the prior art where the radio transceiver 24 is physically connected to the line interface system 22.
The portable mode is similar to the mobile mode of a conventional portable cellular telephone. The fixed cellular terminal system 20 operates in an idle mode and a conversation mode. The system is in the idle mode when it is waiting for a AMENDED SHEET

CA 02370552 2001-10-15 _ 06-04-200 ,~, i p332-WO US 000009019 telecommunication to occur between a user of the fixed cellular terminal system 20 and another party over the cellular network. The system is in the conversation mode when a telecommunication occurs between a user of the fixed cellular terminal system 20 and another party over the cellular network. For example, the telecommunication may be a telephone call, a facsimile transmission, or communication link to the intemet. The present invention allows for the radio transceiver 24 to distinguish between the fixed mode and the portable mode, and to switch between the fixed mode and the portable mode even in the middle of a conversation.
As shown in Figure 2, when the radio transceiver 24 is in the idle mode (as compared to the conversation mode), the radio transceiver 24 is programmed to inquire at predetermined intervals if there has been a change between fixed and portable modes. At block 100, the radio transceiver 24 is activated and automatically goes into the portable mode as its initial mode. Within a predetermined time period (usually 2 seconds), an inquiry is sent from the radio transceiver 24, as shown at block 102, to determine if the radio transceiver 24 is connected to an external power supply and if it is receiving communications from the line interface controller 31 of the line interface system 22. If the response to this inquiry is negative, then the radio transceiver 24 remains in the portable mode.
However, if the response to this inquiry is positive, the radio transceiver 24 will switch to the fixed mode, as shown at block 104. At predetermined time intervals when the radio transceiver 24 is in the fixed mode, as shown at block 106,the radio transceiver 24 will send out inquiries as to the status of communications with the line interface controller 31 and as to a connection to the power supply 32 for the line interface system 22. If the inquiries are positive, then the radio transceiver remains in the fixed mode. However, if the inquiry is negative, the radio transceiver 24 switches to the portable mode.
The communication sequences between the radio transceiver 24 and the line intertace controller 31 of the line intertace system 22 are shown in Figure 3.
The format of the communications may be AT commands in ASCII format andlor AMENDED SHEET

'06-04-200 p10362-. 1N0 US 000009b19 binary commands. However, those skilled in the pertinent art will recognize that other commands and formats may be utilized in the communications sequences between the radio transceiver 24 and the line intertace controller 22 without departing from the spirit and scope of the present invention. As shown in Figure 3, the line interface controller 31 of the line interface system 22 at block 120 is activated and waits for a predetermined time period (usually 2 seconds) before sending off a communication to the radio transceiver 24 which is in the portable mode represented by block 122. A communication 124 from the line intertace controller 31 to the radio transceiver 24 inquires whether the radio transceiver 24 is connected to the docking unit 28, 28a. An inquiry, as shown at block 126, as to the availability of external power, is sent out from the radio transceiver 24. A
positive response 127 sent to the line intertace controller 31 elicits an initialization success reply 128 that initiates the communication sequences for the radio transceiver 24 to switch to the fixed mode as represented by block 130. At predetermined time intervals, the line interface controller 31 sends status request inquiries 132 to the radio transceiver 24. The radio transceiver 24 will reply with a status response 134 indicating that it is still connected to the docking unit 28, 28a. However, as indicated at block 13fi, if the predetermined time period expires and a status request is not received by the radio transceiver 24, the radio transceiver 24 changes from the fixed mode into the portable mode. If at a later time a status request 138 is again sent by the line interface controller 31 to the radio transceiver 24, a response 140 will be sent from the radio transceiver 24 indicating that it is again connected to the docking unit 28,28a, and an initialization success 128 communication will be sent from the line interface controller 31 to the radio transceiver 24.
The logic involved in switching between the portable mode and the fixed mode is illustrated in Figure 4. As seen at block 150, the radio transceiver 24 is activated in a default portable mode. An inquiry 152 is sent to determine if there is a connection to an external power supply, and to determine if any communication sequences have been received from the fine interface controller 31 of the line interface system 22. A positive response will place the radio transceiver 24 in the CA 02370552 2001-10-15 us ooOOO9o19 '-06-04-200 i ~.~ 0362-V110 fixed mode as indicated at block 154. An inquiry 156 concerning the conversation mode is sent from the radio transceiver 24.
If a positive response is received to this inquiry 156, then as indicated at block 158, the radio transceiver 24 generates a ring via the telephone 30d to indicate that the switching is completed and the conversation can be continued by using the telephone, DTMF unit 30a. A negative response to the conversation mode inquiry 156 will elicit a second response 160 as to the presence of external power and the status of communication sequences from the line interface controller 31 to the radio transceiver 24. A positive response to this inquiry 160 will maintain the radio transceiver 24 in the fixed mode, and after a predetermined time period the conversation mode inquiry 156 will again be sent out by the radio transceiver 24.
A negative response to this inquiry 160 will elicit a second conversation mode inquiry 162 from the radio transceiver 24. !f the response to this inquiry 162 is positive, then the DTMF unit 30 is not being used and the radio transceiver 24 is being used as a conventional portable cellular telephone. Thus, as indicated at block 164, the software program of the radio transceiver 24 switches the audio path from the DTMF
unit 30a to the internal speaker microphone of the radio transceiver 24.
However, if the response to this conversation mode inquiry 162 is negative, then the conversation, if any was present, was terminated and the radio transceiver 24 switches to the portable mode.
As shown in Figure 5, the docking unit 28 has an ;interface 200 for operably connecting the radio transceiver 24. The receptorlinterface 200 provides the necessary connections between the docking unit 28 and the radio transceiver 24 for providing connections to the line interfiace system 22. The docking unit provides a power connection 202 for receiving power from the power supply 32 of the line interface system 22. The docking unit 28 also has a communication interface 204 for providing communications between the radio transceiver 24 and a corresponding communication interface 206 of the line interface controller 31 of the line interface system 22. The docking unit 28 also has an antenna interface 206 for providing access for the radio transceiver 24 to the antenna 36 of the line interface AMENDED SHEET

w06-04-2001 p1 p3n2-V'~l0 . US 000009019 system 22. Those skilled in the art will recognize that other intertace connections may be integrated into the docking unit 28 without departing from the spirit and scope of the present invention.
Although the docking unit 28 as shown in Figure 5 is a separate component, the interface units 200, 202, 204, and 206 may be integrated into the line interface system 22. The docking unit 28 may consist of a stand-alone component with connections to the line interface system 22, or it may be integrated into the line interface system 22 as illustrated in Figure 1A.
In using the present invention, only one telephone number need be assigned to the consumer for both the cellular telephone use and also the DTMF
use. Thus, a consumer may be reached on hislher cellular phone/radio transceiver 24 or at hislher home at one of the DTMF units such as the telephone 30a through the use of a single telephone number. The fixed cellular terminal system 20 allows for the radio transceiver battery to be charged while operably connected in the docking unit 28. The radio transceiver 24 may retain all of the functions of a conventional cellular telephone including voice privacy, caller lD, three-way calling, as well as storage of caller ID numbers. Thus, the radio transceiver 24 may be used as an external caller ID display for one of the DTMF units 30a-f. Further, the radio transceiver 24 may be charged during use of the DTMF units 30a-e. Also, billing which is a competitive factor for the operator, may be easily controlled by using the Intelligent Roaming Data-Base (IRDB) data with different SIDs (Residential, Private, Preferred, Favored, etc.). The user may be offered different rate plans depending on the system identifier the phone uses to get service. When the radio transceiver 24 is connected to the Line interface system 22, the radio transceiver 24 may automatically be forced to select a special system identification number.
Thus, the present invention has the potential to make a fixed cellular terminal system flexible and user friendly.

Claims

10 I CLAIM AS MY INVENTION:
1. A fixed cellular terminal system for utilization of a DTMF
telecommunication unit (30a-30e) and a portable cellular telephone in a cellular network (38), the fixed cellular terminal system comprising a line interface system (22) comprising a line interface controller (31) and a power supply (32), the line interface controller (31) capable of providing a connection between a DTMF
telecommunication unit (30a-30e) and a cellular network (38); a cellular telephone with a speaker and microphone and having a radio transceiver (24) to connect the line interface system (22) to a cellular network (38) and means for detection of a connection from the line interface controller (31) of the line interface system (22) to the radio transceiver (24); and a docking mechanism (28) through which the radio transceiver (24) is connected to the line interface system (22) to connect the line interface controller (31) to the cellular network (38) and to provide power to the radio transceiver (24) from the power supply (32) of the line interface system (22), characterized in that said line interface controller (31) is adapted to activate said cellular telephone speaker and microphone when said detection means detects that said radio transceiver (24) has been disconnected from said docking mechanism (28) while said system is in a conversation mode.
2. The system according to claim 1 wherein the radio transceiver (24) comprises a software program that is programmed for operating the radio transceiver (24) in a fixed mode for connection of a DTMF telecommunication unit (30a-30e) with a cellular network (38), and for operating the radio transceiver (24) in a portable mode for use as a conventional portable cellular telephone.
3. The system according to claim 1 wherein the detection means comprises means for detection of power being supplied to the radio transceiver (24) by the power supply (32) of the line interface system (22).

4. The system according to claim 1 wherein the radio transceiver (24) and the line interface controller (31) further comprise means for maintaining a connection to the cellular network (38) during a telecommunication while switching between use of a DTMF telecommunication unit (30a-30e) and the radio transceiver (24) as a conventional portable cellular telephone.
5. The system according to claim 1 wherein the DTMF
telecommunication unit (30a-30e) is selected from the group consisting of telephones, modems, and facsimile machines.
6. A radio transceiver (24) of a cellular telephone capable of utilization with a fixed cellular terminal system, the radio transceiver (24) operable as a component of a line interface system (22) of the fixed cellular terminal system and also as a stand-alone portable cellular telephone, the radio transceiver (24) comprising means for detection of a connection between the radio transceiver (24) and a line interface controller (31) of the line interface system (22), means for operating the radio transceiver (24) in a fixed mode and a portable mode, wherein the radio transceiver (24) is utilized as a component of the line interface system (22) to connect a DTMF telecommunication unit (30a-30e) to a cellular network (38) during the fixed mode, and wherein the radio transceiver (24) is utilized as a stand-alone portable cellular telephone during the portable mode, characterized in means for activating a cellular telephone speaker and cellular telephone microphone when said detection means detects that said radio transceiver (24) has been disconnected from said docking mechanism (28) while said system (22) is in a conversation mode.
7. The radio transceiver (24) according to claim 6 further comprising means for detection of power being supplied to the radio transceiver (24) by an external power supply (32).

comprising the steps of operating the radio transceiver (24) in one of (a) a fixed mode by interfacing one of the modem, telephone, facsimile through the radio transceiver (24) to the cellular network (38), and (b) a portable mode as a conventional cellular telephone using the cellular network (38); and changing the operation of the radio transceiver (24) to the other of the fixed mode and the portable mode, characterized in changing the operation from the fixed mode to the portable mode when in a conversation mode includes activating a speaker and microphone on the cellular telephone.
14. The method according to claim 13 including the steps of placing the radio transceiver (24) in a conversation mode during a telecommunication over the cellular network (38), and changing the operation of the radio transceiver (24) to the other of the fixed mode and the portable mode while maintaining the connection to the cellular network (38) by the radio transceiver (24) during the telecommunication.
15. The method according to claim 13 further comprising detecting the supply of power to the radio transceiver (24).
16. The method according to claim 13 further comprising detecting a communication link between a line interface controller (31) of a line interface system (22) of the fixed cellular terminal system and the radio transceiver (24) at predetermined time intervals.
17. The method according to claim 16 further comprising switching the radio transceiver (24) from the fixed mode to the portable mode if the communication link between the line interface controller (31) and the radio transceiver (24) has been terminated.

18. The method according to claim 13 further comprising inquiring if the radio transceiver (24) is in a conversation mode or an idle mode, wherein the radio transceiver (24) is connected to a cellular network (38) for a telecommunication in the conversation mode, and the radio transceiver (24) is prepared for a telecommunication in the idle mode.
19. The method according to claim 16 further comprising using a DTMF telecommunication unit (30a-30e) connected to the line interface system (22) with the radio transceiver (24) in the fixed mode.
20. The method according to claim 13 further comprising charging the radio transceiver (24) with the radio transceiver (24) in the fixed mode.