US 5,517,690 AGranted

Adaptive cellular paging system with selectively activated cells

AssigneeMotorola, Inc.

InventorsRoger D. Linquist, Malcolm M. Lorang

Life of this patent

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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.

Claims9

Dependent claims

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 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/250,637Filed 27 May 1994 · continuation
Priority: 26 Feb 1991
Granted: 14 May 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04W 84/022
Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]:…
G01S 5/06
Using radio waves: position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
H04B 7/18567
Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service: arrangements for providing additional…
H04W 64/00
Locating users or terminals or network equipment for network management purposes