Multiple transmitter message transmission system and method therefor

• US 5,128,934 A
• Filed: 06/29/1990
• Issued: 07/07/1992
• Est. Priority Date: 06/29/1990
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Jasinski, Leon
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): BLUM, RUSSELL
• Application Number:
  US07/546,284
• Time in Patent Office: 739 Days
• Field of Search: 370/95.1, 370/84, 370/94.2, 340/825.44, 340/825.47, 379/58, 379/59, 379/60, 455/32, 455/33, 455/56, 455/57
• US Class Current: 370/312
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging

Abstract

A multiple transmitter message transmission system provides for the distribution of message packets from a central transmitter station to a plurality of remote transmitter stations on a common channel on which the messages are delivered to a plurality of paging receivers operating within the system. The messages are delivered by simulcast transmissions from the central transmitter station and the plurality of remote transmitter stations. The system is capable of functioning with a variety of signaling protocols, and reduces the number of channels required for message distribution and delivery to a single common channel.

Claims

1. A method for delivering a message to a communication receiver operating in a communication system comprising a plurality of transmission cells defining transmission areas, each transmission cell having a cell transmitter and a cell receiver operating on a common channel with the communication receivers, said method comprising the steps of:

transmitting a message packet including the message intended for the communication receiver at a first data bit rate on the common channel, the message packet being transmitted from a predetermined one of the cell transmitters located within one of the plurality of transmission cells;

receiving the transmitted message packet by the cell receivers located within the other of the plurality of transmission cells; and

transmitting the message packet for delivery of the messages intended for the communication receiver from each of the cell transmitters within each of the plurality of transmission cells at a second data bit rate on the common channel.

2. The method of claim 1, wherein the second data bit rate is lower than the first data bit rate.

3. The method of claim 1 wherein said second step of transmitting simulcast transmits the message packets from each of the plurality of cell transmitters.

4. The method of claim 1 wherein said second step of transmitting sequentially transmits the message packets from each of the plurality of cell transmitters.

5. The method of claim 1 wherein said second step of transmitting simulcast transmits the message packets from a plurality of selected groups of the plurality of cell transmitters in a predetermined sequence.

6. The method of claim 1, wherein said first step of transmitting transmits the message packet at the first data bit rate during a first predetermined time interval, and further wherein said second step of transmitting transmits the message packet at the second data bit rate during a second predetermined time interval.

7. The method of claim 6 further comprising said steps of:

synchronizing the cell receivers for reception of the message packet transmitted at the first data bit rate on the common channel during the first predetermined time interval; and

synchronizing the cell transmitters for transmission of the message packet at the second data bit rate during the second predetermined time interval.

8. The method of claim 7 further comprising said step of synchronizing the communication receiver for receiving the message packet transmitted at the second data bit rate on the common channel during the second predetermined time interval.

9. A method for delivering a message to a communication receiver operating in a communication system comprising a plurality of transmission cells defining at least first and second co-located transmission regions, each transmission cell in each region having a cell transmitter and a cell receiver operating on a common channel with the communication receiver, said method comprising the steps of:

transmitting the message packet at a first data bit rate on the common channel, the message packet being transmitted from a predetermined one of the cell transmitters located within the first transmission region;

receiving the transmitted message packet by the cell receivers located within the other of the plurality of transmission cells within the first transmission region;

further receiving the transmitted message packet by a predetermined one of the cell receivers located within the second transmission region;

retransmitting, within the second transmission region, the message packet at the first data bit rate on the common channel, the message packet being retransmitted from the cell transmitter associated with the predetermined one of the cell receivers which received the message packet transmitted within the first transmission region; and

transmitting the message packet at a second data bit rate on the common channel for delivery of the message intended for the communication receiver from each of the cell transmitters within the first and second transmission regions.

10. The method of claim 9, wherein the second data bit rate is lower than the first data bit rate.

11. The method of claim 9, wherein said step of transmitting the message packet at the second data bit rate simulcast transmits the message packets from each of the plurality of cell transmitters.

12. The method of claim 9 wherein said step of transmitting the message packet at the second data bit rate simulcast transmits the message packets from a plurality of selected groups of the plurality of cell transmitters in a predetermined sequence.

13. The method of claim 9, wherein

said step of transmitting the message packet at the first data bit rate transmits the message packet during a first predetermined time interval,

said step of retransmitting the message packet at the first data bit rate transmits the message packet during a second predetermined time interval, and

said second step of transmitting the message packet at the second data bit rate transmits the message packet during a third predetermined time interval.

14. The method of claim 13 further comprising the steps of:

synchronizing the cell receivers in the first transmission region, and the predetermined one of the cell receivers in the second transmission region, for reception of the message packet transmitted at the first data bit rate on the common channel during the first predetermined time interval;

synchronizing the cell receivers in the second transmission region for reception of the message packet transmitted at the first data bit rate on the common channel during the second predetermined time interval; and

synchronizing the cell transmitters in each transmission region for transmission of the message packet at the second data bit rate during the third predetermined time interval.

15. The method of claim 14 further comprising said step of synchronizing the communication receiver for receiving the message packet transmitted at the second data bit rate on the common channel during the third predetermined time interval.

16. A multiple transmitter message transmission system providing systemwide message distribution to a plurality of transmission areas on a common communication channel which is also utilized for the delivery of a message intended for a communication receiver operating within the system, said system comprising:

a primary transmitter means, providing transmission coverage for the plurality of transmission areas, for transmitting a message packet at a first predetermined data bit rate on the common channel for distribution of the same throughout the plurality of transmission areas,

said primary transmitter means, subsequently for transmitting the message packet at a second data bit rate on the common channel, for delivery of the message intended for the communication receiver within a predetermined one of the plurality of transmission areas;

receiver means, located within each of the other of the plurality of transmission areas, for receiving the message packet transmitted at the first data bit rate on the common channel; and

secondary transmitter means for providing transmission coverage for each of the other of the plurality of transmission areas, and being responsive to the message packet received at the first predetermined data bit rate, for subsequently transmitting the message packet at the second data bit rate on the common channel for delivery of the message intended for the communication receiver within the other of the plurality of transmission areas.

17. The multiple transmitter message system of claim 16 wherein said primary transmitter means comprises:

timing means for generating first and second bit timing signals;

controller means, responsive to the first and second bit timing signals, for controlling the transmission of the message packet at the first predetermined data bit rate for a first predetermined time interval, and further for controlling the transmission of the message packet at the second predetermined data bit rate for a second predetermined time interval; and

a cell transmitter, coupled to said controller means, for transmitting the message packet at the first and second predetermined data bit rates.

18. The multiple transmitter message system of claim 17 wherein the message packet comprises a synchronization code word, and an address and associated message, the address identifying the communication receiver for which the associated message is intended.

19. The multiple transmitter message system of claim 16 wherein said secondary transmitter means comprises:

synchronizing means responsive to a received first synchronization code word, for generating synchronization signals in response thereto;

secondary timing means, responsive to the first synchronization signals, for generating first and second recovered bit timing signals in response thereto;

controller means, responsive to the first and second bit timing signals, for controlling the reception of the message packet at the first predetermined data bit rate for the first predetermined time interval, and further for controlling the transmission of the messages at the second predetermined data bit rate for the second predetermined time interval;

receiver means, being responsive to said controller means, for receiving the message packet transmitted during the first predetermined time interval; and

a cell transmitter, being responsive to said controller means, for transmitting the messages during the second predetermined time interval.

20. The multiple transmitter message system of claim 19 wherein the first synchronization code word is transmitted at the first predetermine data bit rate.

21. The multiple transmitter message system of claim 20 wherein said synchronizing means is further responsive to a second predetermined synchronization code word for generating the synchronization signals in response thereto.

22. The multiple transmitter message system of claim 21 wherein the second synchronization code word is transmitted at the second predetermined data bit rate.

23. The multiple transmitter message system of claim 19 wherein said secondary transmitter means further comprises memory means, coupled to said controller means, for storing the received message packet.

24. The multiple transmitter message system of claim 16 wherein said second step of transmitting simulcast transmits the message packets from each of the plurality of cell transmitters.

25. The multiple transmitter message system of claim 16 wherein said second step of transmitting sequentially transmits the message packets from each of the plurality of cell transmitters.

26. The multiple transmitter message system of claim 16 wherein said second step of transmitting simulcast transmits the message packets from a plurality of selected groups of the plurality of cell transmitters in a predetermined sequence.