Method and apparatus in a wireless messaging system for dynamic creation of directed simulcast zones
First Claim
1. A method in a wireless messaging system for dynamic creation of simulcast zones optimized for transmission of an outbound message from a plurality of base transmitters to a portable subscriber unit, the method comprising the steps of:
- pre-programming the plurality of base transmitters with a corresponding plurality of position coordinates for identifying a plurality of positions at which the plurality of base transmitters are located;
determining, by a fixed portion of the wireless messaging system in response to an inbound message from the portable subscriber unit, an estimate of a location at which the portable subscriber unit is positioned;
sending the outbound message and said estimate from a controller to the plurality of base transmitters;
calculating by the plurality of base transmitters a plurality of distances between the plurality of base transmitters and the portable subscriber unit, based upon the plurality of position coordinates and said estimate; and
independently making a decision by a base transmitter of the plurality of base transmitters of whether to transmit the outbound message, based upon a comparison of a predetermined rule with a distance of the plurality of distances, the distance being that between the base transmitter and the portable subscriber unit.
4 Assignments
0 Petitions
Accused Products
Abstract
Base transmitters (116) of a wireless messaging system are pre-programmed (802) with location identifiers (216) for identifying the positions at which the base transmitters are located. In response to an inbound message from a portable subscriber unit (122), a fixed portion (102) of the wireless messaging system makes an estimate (808) of a location at which the portable subscriber unit is positioned. A controller (112) sends (812) an outbound message (614) and the estimate to the base transmitters, and the base transmitters calculate (812) distances between themselves and the portable subscriber unit, based upon the location identifiers and the estimate. In addition, the base transmitters independently make a decision (818) whether to transmit the outbound message, based upon a comparison of a predetermined rule with the distance of the base transmitter from the portable subscriber unit.
78 Citations
19 Claims
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1. A method in a wireless messaging system for dynamic creation of simulcast zones optimized for transmission of an outbound message from a plurality of base transmitters to a portable subscriber unit, the method comprising the steps of:
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pre-programming the plurality of base transmitters with a corresponding plurality of position coordinates for identifying a plurality of positions at which the plurality of base transmitters are located; determining, by a fixed portion of the wireless messaging system in response to an inbound message from the portable subscriber unit, an estimate of a location at which the portable subscriber unit is positioned; sending the outbound message and said estimate from a controller to the plurality of base transmitters; calculating by the plurality of base transmitters a plurality of distances between the plurality of base transmitters and the portable subscriber unit, based upon the plurality of position coordinates and said estimate; and independently making a decision by a base transmitter of the plurality of base transmitters of whether to transmit the outbound message, based upon a comparison of a predetermined rule with a distance of the plurality of distances, the distance being that between the base transmitter and the portable subscriber unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A base transmitter in a wireless messaging system for dynamic creation of simulcast zones optimized for transmission of an outbound message from a plurality of base transmitters to a portable subscriber unit, the base transmitter comprising:
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a transmitter for transmitting the outbound message; a processing system coupled to the transmitter for processing the outbound message; and a controller interface coupled to the processing system for communicating with a controller, wherein the processing system comprises a memory for pre-programming the base transmitter with position coordinates for identifying a position at which the base transmitter is located, and wherein the processing system is programmed to; cooperate with the controller interface to receive from the controller the outbound message and an estimate of a location at which the portable subscriber unit is positioned; calculate a distance between the base transmitter and the portable subscriber unit, based upon the position coordinates and said estimate; and independently make a decision of whether to transmit the outbound message, based upon a comparison of a predetermined rule with the distance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification