Multiple transmitter paging system

• US 5,162,790 A
• Filed: 04/08/1991
• Issued: 11/10/1992
• Est. Priority Date: 07/10/1989
• 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): Yusko, Donald J.
• Assistant Examiner(s): Weissman, Peter
• Application Number:
  US07/681,656
• Time in Patent Office: 582 Days
• Field of Search: 340/825.44, 340/311.1, 340/825.08, 340/825.47, 340/313, 455/33.1, 455/16, 455/54.2, 379/59, 379/60
• US Class Current: 340/7.25
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04W 84/025 with acknowledge back capability

Abstract

A multiple transmitter wide area communication system comprises a central station having a plurality of acknowledge back receivers, each receiving acknowledge back responses on one of a plurality of acknowledge back channels, and a plurality of transmitters each transmitting on an individual channel. The system further comprises a plurality of remote stations each having an acknowledge back receiver which is capable of selectably receiving acknowledge back responses on each of the individual channels, and a transmitter which is capable of selectably transmitting on each of the individual channels. Each central station transmitter substantially simultaneously transmits at a high data bit rate on each individual channel the addresses for acknowledge back pagers for which messages are intended, and further transmits at a high data bit rate the associated messages intended only for those acknowledge back pagers which responded with an acknowledge back response. The central station then transmits at a high data bit rate on a preselected channel, in a predetermined sequence, to the remote stations the addresses and messages of only those acknowledge back pagers failing to respond to the previous address transmissions from the central station. The remote stations then simulcast transmit at a low data bit rate on the preselected channel the addresses of those acknowledge back pagers which failed to previously respond. The remote stations then transmit at a high data bit rate in a predetermined station sequence the messages intended for those acknowledge back pagers which responded with an acknowledge back signal.

Claims

1. A method for transmitting addresses and messages to a plurality of acknowledge back pagers operating within a wide area communication system, the communication system comprising a central transmitter station surrounded by a plurality of remote transmitter stations to provide message delivery over a predetermined geographic area, said method comprising the steps of:

transmitting, from the central transmitter station, the addresses of those acknowledge back pagers for which messages are intended;

transmitting, from the central transmitter station the messages intended for those acknowledge back pagers which acknowledge reception of the address transmission from the central station throughout the predetermined geographic area;

transmitting, from the central transmitter station to the remote transmitter stations, the addresses and messages of those acknowledge back pagers failing to acknowledge reception of the address transmission from the central station;

simulcast transmitting, from the remote transmitter stations, the addresses of those acknowledge back pagers previously failing to acknowledge reception of the address transmission from the central transmitter station; and

simulcast transmitting, from the remote transmitter stations, the messages intended for those acknowledge back pagers which subsequently acknowledge reception of the address transmission from the remote transmitter stations.

2. The method of transmitting addresses and messages in a wide area communication system according to claim 1, wherein each of said plurality of acknowledge back pagers is assigned to operate on one of N paging channels, and said central transmitter means includes N transmitters for transmitting on each of the N paging channels, and wherein said step of transmitting addresses and associated messages from the central transmitter station includes the step of transmitting the addresses and the associated messages by the central station transmitters in predetermined transmitter groups on N-1 paging channels during a predetermined transmission sequence comprising N transmission time intervals.

3. The method of transmitting addresses and messages in a wide area communication system according to claim 2, wherein said step of transmitting addresses and associated messages from the central transmitter station to the remote transmitter stations includes the step of transmitting the addresses and messages on an Ith channel during a transmission time interval subsequent to the address and associated message transmission from the central transmitter station, where the Ith channel is the Nth transmitter independent of the sequence of N-1 paging channels.

4. The method of transmitting addresses and messages in a wide area communication system according to claim 3, wherein said step of transmitting the addresses and associated messages from the remote transmitter stations, includes the step of simulcast transmitting the addresses and the associated messages on the Ith channel, from one or more of the remote transmitter stations during the subsequent transmission time interval.

5. The method of transmitting addresses and messages in a wide area communication system according to claim 2, wherein N paging channels corresponds to at least two paging channels.

6. The method for transmitting addresses and messages in a wide area communication system according to claim 1, wherein said step of transmitting messages from the central transmitter station comprises the step of transmitting the acknowledge back pager address followed by the associated message.

7. The method for transmitting addresses and messages in a wide area communication system according to claim 1, wherein said step of transmitting addresses and messages from the central transmitter station comprises the step of transmitting the addresses and the messages at a first data bit rate.

8. The method for transmitting addresses and messages in a wide area communication system according to claim 7, wherein said step of transmitting addresses from the remote stations comprises the step of transmitting the addresses at a second data bit rate which is lower then the first data bit rate.

9. The method for transmitting addresses and messages in a wide area communication system according to claim 8, wherein said step of transmitting messages from the remote transmitter stations comprise the step of transmitting the associated message at the first data bit rate.

10. A wide area communication system for providing message delivery over a predetermined geographic area to a plurality of acknowledge back pagers, said system comprising:

a central transmitter station, and a plurality of remote transmitter stations surrounding said central transmitter station,

said central transmitter station comprising

central transmitter means, for transmitting the addresses of those acknowledge back pagers for which messages are intended,

said central transmitter means further transmitting the messages intended for those acknowledge back pagers which acknowledge reception of the address transmission from the central station throughout the predetermined geographic area, and

said central transmitter means, further transmitting to said plurality of remote transmitter stations, the addresses and messages of those acknowledge back pagers failing to acknowledge reception of the address transmission from the central station throughout the predetermined geographic area;

said plurality of remote transmitter stations comprising

remote transmitter means for simulcast transmitting the addresses of those acknowledge back pagers previously failing to acknowledge reception of the address transmission from said central transmitter station, and

said remote transmitter means further for simulcast transmitting the messages intended for those acknowledge back pagers which subsequently acknowledge reception of the address transmission from said remote transmitter stations.

11. The wide area communication system according to claim 10, wherein each of said plurality of acknowledge back pagers is assigned to operate on one of N paging channels, said central transmitter means includes N transmitters for transmitting on each of the N paging channels, and said remote transmitter means includes a transmitter capable of selectively transmitting on each of the N paging channels.

12. The wide area communication system according to claim 11, wherein

said central transmitter means includes N acknowledge back receivers, each assigned to receive acknowledge back responses on one of N acknowledge back channels, said N transmitters being responsive to said N acknowledge back receivers for transmitting the messages intended for those acknowledge back pagers which acknowledge reception of the address transmission from said central transmitter station, and wherein

said remote transmitter means includes an acknowledge back receiver which is capable of selectively receiving on each of the N acknowledge back channels, said remote transmitter being responsive to said acknowledge back receiver for selectively transmitting on each of the N paging channels the messages intended for those acknowledge back pagers which acknowledge reception of the address transmission from said remote transmitter stations.

13. The wide area communication system according to claim 12, wherein the transmissions of the addresses on each of the N paging channels is interleaved to allow sequential reception of the acknowledge back responses from the acknowledge back pagers responding on each of the N acknowledge back channels, whereby said central transmitter means includes a single acknowledge back receiver which is capable of sequentially receiving the acknowledge back responses on each of the N acknowledge back channels.

14. The wide area communication system according to claim 10, wherein the addresses and the associated messages intended for the acknowledge back pagers are transmitted by said central station transmitters in predetermined transmitter groups of N-1 paging channels during a predetermined transmission sequence comprising N transmission time intervals.

15. The wide area communication system according to claim 14, wherein the addresses and associated messages of those acknowledge back pagers failing to respond to said central transmitter station transmission are transmitted by said central transmitter means on an Ith paging channel to said remote transmitter stations during a transmission time interval subsequent to the address and associated message transmission from said central transmitter station, where the Ith channel is the Nth transmitter independent of the sequence of N-1 paging channels.

16. The wide area communication system according to claim 15, wherein the addresses and the associated messages are further transmitted on the Ith channel, from the remote transmitter stations, during the subsequent transmission time interval.

17. The wide area communication system according to claim 10, wherein N paging channels correspond to at least two paging channels.

18. The wide area communication system according to claim 10, wherein the addresses and the associated messages are transmitted at a first data bit rate from the central station.

19. The wide area communication system according to claim 18, wherein the addresses are transmitted at a second data bit rate, which is lower than the first data bit rate, from said remote transmitter stations.

20. The wide area communication system according to claim 19, wherein the message is transmitted from said remote transmitter stations at the first data bit rate.

21. The wide area communication system according to claim 10, wherein said central transmitter means transmits the acknowledge back pager address and the associated message when transmitting the messages of those acknowledge back pagers acknowledging reception of the address transmission from the central transmitter station.