Adaptive cellular paging system

• US 5,423,056 A
• Filed: 05/02/1994
• Issued: 06/06/1995
• Est. Priority Date: 02/25/1991
• Status: Expired due to Term

• Current Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Original Assignee: Pagemart Inc. (Spok Holdings, Inc.)
• Inventors: Lorang, Malcolm M., Linquist, Roger D.
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): Pham, Chi H.
• Application Number:
  US08/236,247
• Time in Patent Office: 400 Days
• Field of Search: 455/12.1, 455/13.2, 455/33.1, 455/33.2, 455/33.4, 455/51.1, 455/51.2, 455/38.1, 455/56.1, 455/57.1, 455/54.1, 455/54.2, 340/825.44, 340/311.1, 379/57, 379/59
• US Class Current: 455/458
• CPC Class Codes: G01S 5/06 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/12 takes precedence
• CPC Class Codes: H04B 7/18567 Arrangements for providing additional services to the basic mobile satellite telephony service
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging

Abstract

An adaptive paging system includes a paging terminal that is operable to receive paging signals and transmit them up to a satellite (28) and down through a downlink (312) to stick locations (314), (316), (318), (320) and (322). Each of the sticks (314)-(322) is associated with a given locale (324), (326), (328), (330) and (332). The sticks are operable in a simulcast mode and also in a cellular mode. In the cellular mode, each of the sticks (314)-(322) is operable to receive a separate message that is distinct from the other cells. Pagers (36), having a known location at any of the locales (324)-(332) can then be selectively addressed and data transferred thereto. To prevent interference between adjacent RF locales, adjacent cells are not turned on during transmission to select cells in the cellular mode. These can be turned on at a different time. Orthogonal coding can be utilized such that adjacent cells can be turned on, thus increasing throughput.

Claims

1. An adaptive paging system for delivering predesignated messages to select ones of a plurality of paging receivers, comprising:

first and second paging systems for receiving the predesignated messages designated for the select ones of the paging receivers, each of said first and second paging systems having a paging transmitter for transmitting said received predesignated messages over an RF link to the ones of the paging receivers being within an associated predetermined transmission locale about said paging transmitter, which said transmission locale defines the area within which the paging receivers can receive messages;

a location system for determining in which of said first and second paging systems associated predetermined transmission locale that the select ones of the paging receivers can receive the predesignated messages for substantially all positions of said select ones of said paging receivers within the predetermined locale of the predetermined one of said first and second paging systems;

a transmission device for generating the predesignated messages for transmission to the select ones of the paging receivers;

a transmission link for connecting said transmission device to said first and second paging systems; and

routing control circuitry for controlling said transmission device to transmit each of said generated predesignated messages only to the one of said first and second paging systems at which associated predetermined transmission local said location system has determined that the destination ones of the paging receivers can receive predesignated messages.

2. The adaptive paging system of claim 1 wherein said transmission device comprises;

a paging terminal for generating said predesignated messages as paging messages;

a satellite for receiving paging messages generated by said paging terminal and for transmitting said paging messages via said transmission link to said first and second paging systems; and

a satellite uplink for transmitting said generated paging messages from said paging terminal to said satellite.

3. The adaptive paging system of claim 2 wherein said paging terminal is operable to generate nondesignated messages as paging messages for transmission to all of the paging receivers wherein said routing control circuitry is operable in first and second modes, said routing control circuitry in said first mode operating to control said transmission device to transmit each of said raging messages associated with said, generated predesignated messages only to the one of said first and second paging systems at which said location system has determined that the destination paging receivers can receive predesignated messages, and in second mode operating to transmit said paging messages associated with said generated nondesignated messages to both said first and second paging systems, and further comprising control circuitry for switching between said first mode and said second mode in accordance with predetermined criteria to change the system throughput.

4. The adaptive paging system of claim 1, wherein said location system comprises:

a location transmitter co-located with each of the plurality of paging receivers;

each of said paging transmitters operable to transmit a unique transmit ID for the associated one of said first and second paging systems and confined within said associated predetermined transmission locale, and transmitted on a periodic basis;

each of the paging receivers having a unique receive ID associated therewith and operable to receive said unique transmit ID transmitted in the one of said predetermined transmission locales in which the paging receiver is operable to receive transmissions, each of the paging receivers operable to transmit the received transmit ID and the associated unique receive ID through said co-located location transmitter over a location RF link; and

a location receiver disposed at a predetermined location for receiving from said RF link the transmitted transmit ID and associated receive ID from the select ones of the paging receivers, said receive IDs and associated transmit IDs forwarded to said routing control circuitry.

5. The adaptive paging system of claim 4, wherein said location receiver is comprised of first and second location receivers, each of said first and second location receivers co-located with respective ones of said paging transmitters for each of said first and second paging systems.

6. The adaptive paging system of claim 4, wherein:

said transmission device is operable to generate a request-to-send message for each of the select ones of the paging receivers and said routing control circuitry is operable to control said transmission device to transmit said request-to-send messages to said first and second paging systems for receipt by all of the plurality of paging receivers within either of said predetermined transmission locales of either of said first and second paging systems; and

the select ones of the paging receivers receiving the one of said request-to-send messages designated therefor operable to transmit the received transmit ID and associated receive ID with said co-located location transmitter over said location RF link.

7. The adaptive paging receiver of claim 1, wherein each of said predetermined transmit locales associated with said first and second paging systems have a portion thereof that overlap each other.

8. The adaptive paging system of claim 6, wherein said routing control circuitry is operable to inhibit transmission by said transmission device to more than one of said first and second paging systems.

9. A method for adaptively delivering predesignated messages to select ones of a plurality of paging receivers, comprising the steps of:

disposing first and second paging systems within predetermined transmission locales associated therewith, each of the predetermined transmission locales defining the area within which the paging receivers can receive messages;

receiving the predesignated messages that are designated for the select ones of the paging receivers at the first and second paging systems and retransmitting the received predesignated messages within the associated transmission locales;

determining in which of the predetermined transmission locales associated with the first and second paging systems the select ones of the paging receivers can receive the predesignated paging messages for substantially all positions of the select ones of the paging receivers therein;

generating the predesignated messages for transmission to the select ones of the paging receivers;

providing a transmission link from a transmission device to the first and second paging systems; and

controlling the transmission device to transmit each of the generated predesignated messages only to the one of the first and second paging systems at which associated predetermined transmission locale the step of determining has determined that the destination ones of the paging receivers can receive predesignated messages.

10. The method of claim 9, and further comprising, generating nondesignated messages as paging messages for transmission to all of the paging receivers, wherein:

the step of controlling the transmission device operates in first and second modes, with the first mode operable to control the transmission device to transmit each of the paging messages associated with the generated predesignated messages only to the one of the first and second paging systems at which the step of determining has determined that the destination paging receivers can receive predesignated messages;

the second mode operable to control the transmission device to transmit paging messages associated with the generated nondesignated messages to both first and second paging systems, and

further comprising the step of switching between the first and second modes in accordance with predetermined criteria to change the system throughput.

11. The method of claim 9, wherein the step of determining comprises the steps of:

co-locating a location transmitter with each of the plurality of paging receivers;

transmitting a unique transmit ID from the paging transmitters at each of the first and second paging systems and confined within the associated predetermined transmission locale, and transmitted on a periodic basis;

each of the paging receivers having a unique receive ID associated therewith and each of the paging receivers receiving the transmit ID transmitted in the one of the predetermined transmission locales in which the paging receiver is operable to receive transmissions;

transmitting from the transmitter co-located with each of the paging receivers the received transmit ID and the associated unique receive ID over a location RF link; and

disposing a location receiver at a predetermined location; and

receiving at the location receiver from the RF link the transmit ID and associated receive ID from select ones of the paging receivers, the receive IDs, and associated transmit IDs utilized in the step of controlling the transmission device.

12. The method of claim 11, wherein the step of disposing the location receiver comprises disposing first and second location receivers at each of the first and second paging systems, respectively, such that they are co-located with the associated paging transmitters.

13. The method of claim 11, and further comprising the steps of:

generating a request-to-send message for each of the select ones of the paging receivers and the step of controlling the transmission device operable to control the transmission device to transmit the request-to-send messages to the first and second paging systems for receipt by all the plurality of paging receivers within either of the predetermined transmission locales of either of the first and second paging systems; and

receiving at the select ones of the paging receivers the one of the request-to-send messages designated therefor; and

transmitting the received transmit ID and associated receive ID with the co-located location transmitter over the location RF link.