Radio terminal interfaces for voice and data telecommunications, and methods for their operation

• US 5,781,612 A
• Filed: 03/10/1995
• Issued: 07/14/1998
• Est. Priority Date: 03/10/1995
• Status: Expired due to Fees

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Choi, David, Raj, Kishore John
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TROST IV, WILLIAM GEORGE
• Application Number:
  US08/402,049
• Time in Patent Office: 1,222 Days
• Field of Search: 379/58, 379/59, 379/57, 455/33.1, 455/54.1, 370/95.3, 370/95.1
• US Class Current: 455/435.1
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A radio terminal interface includes a signal processor and a controller. The signal processor has a TDMA mode of operation and an AMPS mode of operation. The controller composes signals for registering first and second Mobile Identification Numbers (MINs) assigned to the radio terminal interface in a cellular radio system. The controller also identifies page requests received while the radio terminal interface is in an idle state, and responds to received page requests specifying the first MIN by composing page responses specifying the first MIN. The controller responds to received page requests specifying the second MIN by composing page responses specifying the second MIN. The controller responds to initial traffic channel designation messages received by the radio terminal interface by configuring the signal processor in its TDMA mode, and responds to initial voice channel designation messages by configuring the signal processor in its AMPS mode. The controller responds to a dialling sequence by composing service requests, the service requests specifying the first MIN when the dialling sequence does not contain a predetermined dialling sequence, and specifying the second MIN when the dialling sequence does contain the predetermined dialling sequence. The radio terminal interface can be used to ensure that voice-band data calls (e.g. facsimile transmissions) are assigned AMPS channels by dual-mode cellular radio systems.

Claims

1. A radio terminal transceiver, comprising:

a signal processor having a first mode of operation for converting Time Division Multiple Access (TDMA) signals to voice-band signals and for converting voice-band signals to TDMA signals, and a second mode of operation for converting Advanced Mobile Phone Service (AMPS) signals to voice-band signals and for converting voice-band signals to AMPS signals; and

a terminal transceiver controller for monitoring signals received by the radio terminal transceiver, for composing signals for transmission from the radio terminal transceiver, and for selecting between the first and second modes of operation of the signal processor, the terminal transceiver controller being operable to compose signals for registering first and second Mobile Identification Numbers (MINs) assigned to the radio terminal transceiver in a cellular radio system, to identify page requests received while the radio terminal transceiver is in an idle state, to respond to received page requests specifying the first MIN by composing page responses specifying the first MIN, wherein a digital channel is preferentially allocated and to respond to received page requests specifying the second MIN by composing page responses specifying the second MIN where the second MIN instructs the cellular radio system to always allocate an available analog channel for data transmissions between the cellular radio system and the radio terminal transceiver.

2. A radio terminal transceiver as defined in claim 1, wherein:

the terminal transceiver controller is operable to respond to initial traffic channel designation messages received by the radio terminal transceiver to configure the signal processor for its first mode of operation; and

the terminal transceiver controller is operable to respond to initial voice channel designation messages received by the radio terminal transceiver to configure the signal processor for its second mode of operation.

4. A radio terminal transceiver as defined in claim 1, further comprising:

a Radio Frequency (RF) interface for coupling to an antenna system to receive radio signals from a base station transceiver of the cellular radio system and to transmit radio signals from the radio terminal transceiver to the base station transceiver; and

an audio interface for coupling to telecommunications terminals to receive voice-band signals from the telecommunications terminals and to transmit voice-band signals from the radio terminal transceiver to the telecommunications terminals.

5. A radio terminal transceiver as defined in claim 4, wherein the signal processor is coupled between the RF interface and the audio interface.

6. A radio terminal transceiver as defined in claim 4, further comprising:

an RJ-11 interface connected to the audio interface for coupling the audio interface to telecommunications terminals.

7. A radio terminal transceiver as defined in claim 4, further comprising:

a cellular radio terminal handset connected to the audio interface.

8. A radio terminal transceiver as defined in claim 4, further comprising:

an antenna system coupled to the RF interface for receiving RF signals from and transmitting RF signals to the base station transceiver.

9. A radio terminal transceiver as defined in claim 8, wherein the antenna system comprises at least two antennas arranged to provide spatial diversity.

3. A radio terminal interface, comprising:

a signal processor having a first mode of operation for converting Time Division Multiple Access (TDMA) signals to voice-band signals and for converting voice-band signals to TDMA signals, and a second mode of operation for converting Advanced Mobile Phone Service (AMPS) signals to voice-band signals and for converting voice-band signals to AMPS signals; and

a controller for monitoring signals received by the radio terminal interface, for composing signals for transmission from the radio terminal interface and for selecting between the first and second modes of operation of the signal processor, the controller being operable to compose signals for registering first and second Mobile Identification Numbers (MINs) assigned to the radio terminal interface in a cellular radio system, to identify page requests received while the radio terminal interface is in an idle state, to respond to received page requests specifying the first MIN by composing sage responses specifying the first MIN, and to respond to received page requests specifying the second MIN by composing page responses specifying the second MIN, the controller being operable to respond to a dialling sequence received by the radio terminal interface to compose a service request, the service request specifying the first MIN when the dialling sequence does not contain a predetermined dialling sequence, and the service request specifying the second MIN when the dialling sequence does contain the predetermined dialling sequence.

10. A method for operating a radio terminal transceiver comprising the steps of:

registering first and second Mobile Identification Numbers (MINs) assigned to the radio terminal transceiver in a cellular radio system;

receiving page requests at the radio terminal transceiver while the radio terminal transceiver is in an idle state;

responding to received page requests specifying the first MIN by transmitting from the radio terminal transceiver page responses specifying the first MIN where the first MIN instructs the cellular radio system to allocate one of an analog channel and a digital channel with a preference for the digital channel for the transmitting; and

responding to received page requests specifying the second MIN by transmitting from the radio terminal transceiver page responses specifying the second MIN where the second MIN instructs the cellular radio system to always allocate an available analog channel for data transmissions between the cellular radio system and the radio terminal transceiver.

11. A method as defined in claim 10, wherein the step of registering first and second MINs is performed automatically when the radio terminal transceiver is turned on.

12. A method as defined in claim 11, wherein the step of registering first and second MINs comprises successively registering the first and second MINs according to standardized registration sequences.

13. A method as defined in claim 10, further comprising the step of:

receiving initial traffic channel designation messages at the radio terminal transceiver; and

responding to received initial traffic channel designation messages by configuring a signal processor of the radio terminal transceiver in a first mode for conversion of Time Division Multiple Access (TDMA) signals to voice-band signals and for conversion of voice-band signals to TDMA signals.

14. A method as defined in claim 10, further comprising:

receiving initial voice channel designation messages at the radio terminal transceiver; and

responding to received initial voice channel designation messages by configuring a signal processor of the radio terminal transceiver in a second mode for conversion of Advanced Mobile Phone Service (AMPS) signals to voice-band signals and for conversion of voice-band signals to AMPS signals.

15. A method for operating a radio terminal interface, comprising:

registering first and second Mobile Identification Numbers (MINs) assigned to the radio terminal interface in a cellular radio system;

receiving page requests at the radio terminal interface while the radio terminal interface is in an idle state;

responding to received page requests specifying the first MIN by transmitting from the interface page responses specifying the first MIN;

responding to received page requests specifying the second MIN by transmitting from the interface page responses specifying the second MIN; and

responding to a dialling sequence received at the radio terminal interface by composing and transmitting from the radio terminal interface a service request, the service request specifying the first MIN when the dialling sequence does not contain a predetermined dialling sequence, and the service request specifying the second MIN when the dialling sequence does contain the predetermined dialling sequence.

16. A radio communications system, comprising:

at least one radio terminal transceiver operable in a digital mode to receive and transmit digital radio signals over a digital radio channel and operable in an analog mode to receive and transmit analog radio signals over an analog radio channel, the radio terminal transceiver being responsive to page requests specifying a first terminal identifier to transmit a page response specifying the first terminal identifier and being responsive to page requests specifying a second terminal identifier to transmit a page response specifying the second terminal identifier;

at least one base station transceiver operable in a digital mode to receive and transmit digital radio signals over a digital radio channel and operable in an analog mode to receive and transmit analog radio signals over an analog radio channel; and

at least one base station controller operable to allocate one of an analog radio channel and preferably a digital radio channel for communication between the radio terminal transceiver and the base station transceiver upon receipt of a page response specifying the first terminal identifier and operable to always allocate an available analog radio channel for communication between the radio terminal transceiver and the base station transceiver upon receipt of a page response specifying the second terminal identifier.

17. A radio communications system as defined in claim 16, wherein the base station controller is operable to allocate preferentially a digital radio channel for communication between the radio terminal transceiver and the base station transceiver upon receipt of a page response specifying the first terminal identifier.

18. A radio communications system as defined in claim 16, wherein each digital radio channel is a Time Division Multiple Access (TDMA) radio channel, each analog radio channel is an Advanced Mobile Phone Service (AMPS) radio channel, and each terminal identifier is a Mobile Identification Number (MIN).

19. A radio communications system as defined in claim 16, wherein the base station controller is implemented in a Mobile Telephone Switching office (MTSO).

20. A method of operating a radio communications system comprising:

providing a radio communications system having,

at least one radio terminal transceiver operable in a digital mode to receive and transmit digital radio signals over a digital radio channel and operable in an analog mode to receive and transmit analog radio signals over an analog radio channel, the radio terminal transceiver being responsive to page requests specifying a first terminal identifier to transmit a page response specifying the first terminal identifier and being responsive to page requests specifying a second terminal identifier to transmit a page response specifying the second terminal identifier,

at least one base station transceiver operable in a digital mode to receive and transmit digital radio signals over a digital radio channel and operable in an analog mode to receive and transmit analog radio signals over an analog radio channel, and

at least one base station controller;

operating the base station controller to allocate one of an analog radio channel and preferably a digital radio channel for communication between the radio terminal transceiver and the base station transceiver upon receipt of a page response specifying the first terminal identifier; and

operating the base station controller to always allocate an available analog radio channel for communication between the radio terminal transceiver and the base station transceiver upon receipt of a page response specifying the second terminal identifier.

21. A method as defined in claim 20, wherein the step of operating the base station controller to allocate one of a digital radio channel and an analog radio channel comprises operating the base station controller to allocate preferentially a digital radio channel for communication between the radio terminal transceiver and the base station transceiver upon receipt of a page response specifying the first terminal identifier.