Adaptive cellular paging system with selectively activated cells

• US 5,517,690 A
• Filed: 05/27/1994
• Issued: 05/14/1996
• Est. Priority Date: 02/25/1991
• Status: Expired due to Term

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Lorang, Malcolm M., Linquist, Roger D.
• Primary Examiner(s): Pham, Chi H.
• Application Number:
  US08/250,637
• Time in Patent Office: 718 Days
• Field of Search: 455/12.1, 455/13.1, 455/33.1, 455/33.4, 455/51.1, 455/51.2, 455/53.1, 455/54.1, 455/54.2, 455/56.1, 379/59, 379/63, 340/311.1, 340/825.44, 375/107, 375/356, 370/100.1, 370/104.1, 370/108
• US Class Current: 455/426.1
• 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 transmitting paging messages to a plurality of paging receivers, comprising:

a plurality of paging systems for receiving the paging messages, each of said paging systems having a paging transmitter associated therewith for transmitting the paging messages to the paging receivers that are within an associated transmission locale about said paging transmitter, which said transmission locale defines the area within which the paging receivers can receive messages;

a transmission device for generating the paging messages for transmission to the paging receivers;

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

a paging terminal for controlling said transmission device to transmit the paging messages to said paging systems for retransmission therefrom by said associated paging transmitters, said paging terminal operating in simulcast and cellular modes, said simulcast mode operable to control said transmission device to transmit said paging messages in a simulcast manner such that all of said paging systems receive said transmitted paging messages at substantially the same time, said paging terminal operating in said cellular mode to control said transmission device to transmit said paging messages to only select ones of said paging systems at a given time for retransmission to said associated paging transmitters.

2. The adaptive paging system of claim 1, wherein said transmission device is operable to transmit said paging messages to said paging systems and said paging transmitters associated with said paging systems are operable to transmit said paging messages within said associated transmission locale in substantially the same time frame.

3. The adaptive paging system of claim 1, wherein said transmission device when controlled by said paging terminal in said cellular mode, is operable to transmit different ones of said paging messages to different ones of said paging systems at substantially the same time.

4. The adaptive paging system of claim 1, wherein portions of said transmission locales for adjacent ones of said paging systems overlap.

5. The adaptive paging system of claim 4, wherein only ones of said paging systems having paging transmitters with associated transmission locales that are not overlapping are operable to receive paging messages from said transmission device and transmit paging messages therefrom.

6. The adaptive paging system of claim 1, and further comprising:

a location system for determining in which of said transmission locales associated with said paging systems that select ones of the paging receivers can receive predesignated messages, said predesignated messages generated by said transmission device for transmission to the select ones of the paging receivers; and

routing control circuitry operable during said cellular mode of operation in conjunction with said paging terminal for determining which of said predesignated messages is transmitted to which of said paging systems in accordance with the determined locale of the select ones of the paging receivers.

7. The adaptive paging system of claim 6, 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 paging systems and confined within said associated 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.

8. The adaptive paging system of claim 7, wherein said location receiver is comprised of a plurality of location receivers, each of said plurality of location receivers co-located with respective ones of said paging transmitters for each of said paging systems.

9. The adaptive paging system of claim 7, wherein:

said transmission device is operable to generate a request-to-send messages 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 paging systems for receipt by all of the plurality of paging receivers within any of said predetermined transmission locales of either of said 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.