System and method for a wide area wireless personal communication system incorporating advanced messaging

• US 6,658,250 B1
• Filed: 01/05/1996
• Issued: 12/02/2003
• Est. Priority Date: 01/05/1996
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Inventors: Laborde, Enrique, Ganesan, Kalyan
• Primary Examiner(s): BOCCIO, VINCENT F
• Application Number:
  US08/583,357
• Time in Patent Office: 2,888 Days
• Field of Search: H04/Q.720, 455/38.1, 455/74, 455/89, 455/90, 455/503, 455/526, 379/56-57, 379/58, 379/59, 370/335, 370/342, 370/320
• US Class Current: 455/426.1
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A system and method for integrating advanced messaging capabilities in a wide area wireless personal communications system is provided. The system includes personal transceiver units capable of communicating with one or more of a plurality of long range pagers. The transceiver and long range pager use existing frequencies and formats of the wireless personal communications system. The method provides for registering a personal transceiver in a two way messaging service area of the wireless personal communications system.

Claims

1. A personal access communications system for implementing full two way voice and data service in a voice service area and two way messaging in areas outside the voice service area, the personal access communications system comprising:

a plurality of radio ports for implementing the full two way voice and data service in the voice service area, the radio ports transmitting voice and data signals on a first communication channel;

at least one portable transceiver unit adapted to receive and transmit voice and data in addition to receiving and responding to paging signals; and

a plurality of long range pagers for transmitting and receiving paging signals wherein the paging signals are integrated into the voice and data transmission format of the personal communication system, the long range pagers defining a paging service area outside of the voice service area wherein the long range pagers share a second communication channel different from the first communication channel.

2. The system of claim 1 wherein the portable transceiver unit receives pages from the long range pagers over a predetermined TDM frequency.

3. The system of claim 2 wherein the predetermined TDM frequency is a PACS format TDM frequency.

4. The system of claim 2 wherein the predetermined TDM frequency is configured having 12 time slots in a 6 second frame.

5. The system of claim 4 wherein each time slot is approximately 500 milliseconds and comprises an approximately 25 millisecond guard band and an approximately 475 millisecond information band.

6. The system of claim 5 wherein the approximately 475 millisecond information band comprises a plurality of approximately 95 millisecond messages.

7. The system of claim 1 wherein the portable transceiver unit responds to pages from the long range pagers over a return transmission link at a predetermined frequency using TDMA.

8. The system of claim 7 wherein the predetermined TDM frequency is a PACS format TDM frequency.

9. The system of claim 8 wherein the predetermined TDM frequency is configured to carry a variable length alphanumeric message.

10. The system of claim 9 wherein the variable length alphanumeric message comprises at least one eight bit information segment.

11. The system of claim 10 wherein each eight bit information segment is transmitted in a 2.5 millisecond frame.

12. A wide area wireless personal communication system incorporating advanced messaging capability comprising:

at least one short range transceiver having an operating range defining a voice service area for providing voice and data communication to a user having a personal transceiver unit, the at least one short range transceiver operating on a first communication channel;

a two way messaging service area for providing advanced messaging services to users via a plurality of long range pagers, the long range pagers operating on a second communication channel different from the first communication channel, the long range pagers sharing the second communication channel.

13. The system of claim 12 wherein the wireless personal communication system is a PACS standard system and twelve long range pagers share a single 300 kHz channel.

14. The system of claim 12 wherein at least one of the long range pagers incorporates a transmitter comprising:

a forward error correction encoder in communication with a Hadamard transform encoder;

said Hadamard transform encoder in communication with a parallel-to-IQ converter; and

a bit spreader coupled to a pseudo-random number generator for receiving an I and a Q serial information stream from the parallel-to-IQ converter.

15. A method of registering a personal transceiver unit in a two way messaging service area of a wireless personal communications system comprising the steps of:

monitoring a SBC broadcast in a voice service area with the personal transceiver unit;

switching to a predetermined paging frequency if no SBC is detected;

acquiring a long range pager broadcasting on said paging frequency by (a) searching for a strongest received long range pager signal;

(b) synchronizing the transceiver unit to a long range pager having the strongest signal, and (c) reading a transmitter ID for the long range pager having the strongest signal; and

registering a location of the personal transceiver unit with the wireless personal communications system via the long range pager.

16. The method of claim 15 wherein the predetermined paging frequency is an existing frequency used in the wireless system.

17. The method of claim 16 wherein the long range pager ID is a four bit code.

18. The method of claim 15 further comprising the step of continuously updating the location of the personal transceiver with a long range pager at specified predetermined intervals as the personal transceiver moves through different broadcast spheres of other long range pagers.