US 5,396,643 A · Geographic-area selective low-earth satellite-based paging broadcast system and method

Abstract

The present invention includes a low-earth satellite-based paging broadcast system (100) and method (200, 300) that maximizes spectral efficiency and minimizes power expenditure for the broadcast of paging messages by broadcasting the messages to terminator- or originator-selectable portions of the total system coverage area. The terminator selects a long-term preferred geographic area (LTPGA), and optionally, a short-term preferred geographic area (STPGA). The originator provides the terminator ID, the message, and optionally provides a customized preferred geographic area (CPGA). Terminators and originators can easily modify the selectable geographic areas (SGA(s)): LTPGA(s), STPGA(s), and CPGA(s). The gateway converts the SGA(s) to addressable coverage areas (ACA(s)), and transmits a signal including the paging information, and ACA(s) to at least a first communication satellite (COM SAT). The COM SAT(s) provide for crosslinking the signal to other COM SAT(s) and for broadcasting the paging information to the ACA(s).

Drawings

Drawings are temporarily unavailable. Open the PDF at USPTO

Drawings

Claims16

Dependent claims

A geographic area-selective low-earth satellite-based paging broadcast method for a system comprising at least:

an origination unit for at least a first originator,
a termination unit for at least a first terminator,
a gateway, and
a plurality of communication satellites having a plurality of addressable coverage areas, for facilitating the at least first originator's utilizing the originator unit for transmitting a paging message to at least one preselected termination unit addressable coverage area and at least one of the communication satellites of the plurality of communication satellites,
said method comprising the steps of:
(A) assigning an identification code by the gateway to the termination unit and
selecting, by the termination unit, at least a long-term preferred geographical area and, optionally selecting, by the termination unit, a short-term preferred geographical area to receive the paging message sent by the at least first originator,
(B) transmitting the paging message by the originator, and optionally, a customized preferred geographical area,
(C) determining, by the gateway, at least one addressable coverage area in accordance with at least one selected geographic area,
(D) transmitting, by the gateway, information including said at least one addressable coverage area, said identification code, and the paging message to said at least said one communication satellite of the plurality of communication satellites wherein said at least one communication satellite of the plurality of communication satellites has at least a transceiver and;
(E) one of:
(E1) where said at least one addressable coverage area is in a broadcast range beyond that of said at least one communication satellite of the plurality of communication satellites, transmitting, by said at least one communication satellite of the plurality of communication satellites, the information to at least one further communication satellite of the plurality of communication satellites, each having at least a transceiver, in crosslink fashion to at least one of other communication satellites of the plurality of communication satellites that are in a broadcast range containing said at least one addressable coverage area, and transmitting, by at least one of said other communication satellites of the plurality of communication satellites, the information to said at least one addressable coverage area,
(E2) where said at least one addressable coverage area is in a broadcast range within that of said at least one communication satellite of the plurality of communication satellites, transmitting, by said at least one communication satellite of the plurality of communication satellites, the information to said at least one addressable coverage area, wherein the paging message is transmitted to the termination unit;
(F) where selected, determining, by the gateway, whether said short-term preferred geographic area has been selected by the termination unit, and where said short-term preferred geographic area is selected, utilizing said short-term preferred geographic area in correspondence with said identification code, for use as selected by termination unit, and
simultaneously, determining, by the gateway, whether the paging message has been sent to the termination unit and repeating step F at predetermined intervals until the paging message is detected,
(G) where the paging message has been transmitted by the originator, providing, by the originator, to the gateway the identification code for the termination unit to receive the paging message,
(H) customizing selection of a geographic coverage area in correspondence with one of:
the long-term preferred geographical area, the short-term preferred geographical area and the customized preferred geographical area where selected by the originator,
(I) determining, by the gateway:
at least a first addressable coverage area in correspondence with the geographic area selected in step (H),
(J) transmitting, by the gateway, information including the at least one addressable coverage area, the identification code, and the paging message to said at least one communication satellite,
(K) determining by said at least one communication satellite, whether the information includes the at least one addressable coverage area within said communication satellite's broadcast range, and where beyond said range, crosslink transmitting to at least one further communication satellite of the plurality of satellites until at least one communication satellite within said range receives the information,
(L) where said at least one communication satellite of the plurality of communication satellites within said range receives the information, transmitting, by said at least one communication satellite of the plurality of communication satellites within said range the information to the at least one addressable coverage area in said at least one communication satellite's broadcast range and removing said at least one addressable coverage area from the information, and, where further addressable coverage areas remain, transmitting the information with the further addressable coverage areas to another communication satellite of the plurality of satellites for crosslink transmission in accordance with steps K-L until the information has been transmitted to all addressable coverage areas selected by the originator, thus facilitating transmission of the information to the predetermined termination unit.

20 more elements

A geographic area-selective low-earth satellite-based paging broadcast method for a system comprising at least:

an origination unit for at least a first originator,
a termination unit for at least a first terminator,
a gateway, and
a plurality of communication satellites having a plurality of addressable coverage areas, for facilitating an originator's utilizing an originator unit for transmitting a paging message to:
at least a first preselected termination unit addressable coverage area and
at least a first communication satellite,
said method comprising the steps of:
(A) determining, by the gateway, whether transmission of the paging message has been requested, and, where transmission of the paging message is unrequested, recycling to determining whether transmission of the paging message has been requested;
(B) where transmission of the paging message is requested, providing, by the originator, a termination unit identification code to the gateway for a selected terminator;
(C) determining, by the gateway, whether the originator has selected a customized preferred geographic area for transmitting the paging message;
(D) where the originator has selected at least one customized preferred geographic area, utilizing, by the gateway, the selected at least one customized preferred geographic area;
(E) where the at least one customized preferred geographic area into which to transmit the paging message is unselected, determining, by the gateway, whether a short term preferred geographic area has been selected;
(F) where the short term preferred geographic area is unselected, utilizing, by the gateway, a predetermined long term preferred geographic area;
(G) where the short term preferred geographic area is selected, utilizing, by the gateway, the predetermined short term preferred geographic area;
(H) converting, by the gateway, where selected, the short-term preferred geographical area, and where the short-term preferred geographical area is unselected, converting the long-term preferred geographical area, to at least one corresponding target addressable coverage area;
(I) transmitting, by the originator, the paging message to the gateway;
(J) including, by the gateway, the at least one corresponding target addressable coverage area, the termination unit identification code, and the paging message in an information signal;
(K) transmitting, by the gateway, the information signal to said at least one communication satellite of the plurality of communication satellites;
(L) determining, by said at least one communication satellite of the plurality of communication satellites, whether the information signal includes said at least one corresponding addressable coverage area in said at least one communication satellite's broadcasting range;
(M) removing, by said at least one communication satellite of the plurality of communication satellites, said at least one corresponding addressable coverage area of said broadcasting range from the information signal;
(N) broadcasting, by said at least one communication satellite of the plurality of communication satellites, the paging information where said at least one corresponding target addressable coverage area is in said at least one communication satellite's broadcasting coverage area;
(O) determining, by said at least one communication satellite of the plurality of communication satellites, whether further corresponding addressable coverage areas remain in the information signal;
(P) where further corresponding addressable coverage areas remain in the information signal, crosslinking to at least one of other communication satellites of the plurality of communication satellites based on said further corresponding addressable coverage areas, then recycling to step (L) for determining by said at least one of the other communication satellites of the plurality of communication satellites whether said further corresponding addressable coverage areas remain in the information signal;
and
(Q) where all said further corresponding addressable coverage areas have been removed from the information signal, the paging message communication is complete.

22 more elements

A geographic area-selective low-earth satellite-based paging broadcast system comprising at least:

(A) an origination unit for at least a first originator, for transmitting a paging message, and, selectably, a customized preferred geographical area,
(B) a gateway comprising:
means for assigning an identification code to at least a first termination unit,
means for determining at least one addressable coverage area in accordance with selected geographic areas and
transmitting information including at least the at least one addressable coverage area the termination unit identification code, and the paging message to at least one communication satellite of a plurality of communication satellites having at least a transceiver,
(C) a termination unit for at least a first terminator, for selecting at least a long-term preferred geographical area and, optionally selecting a short-term preferred geographical area to receive the paging message sent by the at least first originator, and
(D) the plurality of communication satellites having a plurality of addressable coverage areas comprising:
means for facilitating the first originator utilizing the originator unit,
means for transmitting the paging message to at least one preselected termination unit addressable coverage area and the at least one communication satellite;
(D1) where the at least one addressable coverage area is in a broadcast range beyond that of the at least one communication satellite of the plurality of communication satellites, transmitting, by said at least one communication satellite of the plurality of communication satellites, the information to other communication satellites of the plurality of communication satellites, each having at least a transceiver, in crosslink fashion to said other communication satellites of the plurality of communication satellites that are in a broadcast range containing said at least one addressable coverage area, and said other communication satellites of the plurality of communication satellites transmitting the information to said at least one addressable coverage area,
(D2) where said at least one addressable coverage area is in a broadcast range within that of said other communication satellites of the plurality of communication satellites, transmitting, by said other communication satellites of the plurality of communication satellites, the information to said at least one addressable coverage area, wherein the paging message is transmitted to the termination unit;
wherein, where selected, the gateway is further utilized for determining whether a short-term preferred geographic area has been selected by the termination unit, and where the short-term preferred geographic, area is selected, utilizing the short-term preferred geographic area in correspondence with the termination unit identification code, for use as selected by termination unit, and
simultaneously, the gateway is utilized for determining whether the paging message has been sent to the termination unit and continuing said determination at predetermined intervals until the paging message is detected, and
where the paging message has been transmitted by the originator, the originator is further utilized for providing to the gateway a target pager identification code for the termination unit to receive the paging message,
where selected by the originator, the gateway is further utilized for customizing selection of a geographic coverage area in correspondence with one of:
the long-term preferred geographic area, the short-term preferred geographic area and a customized preferred geographic area,
the gateway is further utilized for determining the at least one addressable coverage area in correspondence with the, where selected, short-term preferred geographic area, and where the short-term preferred geographic area is unselected, in correspondence with the long-term preferred geographic area,
the gateway is further utilized for transmitting the information including the at least one addressable coverage area, the pager identification code, and the paging message to the at least one communication satellite of the plurality of communication satellites,
the at least one communication satellite of the plurality of communication satellites is further utilized for determining whether the information includes said at least one addressable coverage area within said at least one communication satellite's broadcast range, and where beyond said range, crosslink transmitting the information to at least one other communication satellite of the plurality of communication satellites until said at least one other communication satellite of the plurality of communication satellites within said range receives the information, and
where said at least one other communication satellite of the plurality of communication satellites within said range receives the information, said at least one other communication satellite of the plurality of communication satellites is further utilized for transmitting the information to said at least one addressable coverage area in said at least one other communication satellite's broadcast range and removing said at least one addressable coverage area from the information, and, where at least one further addressable coverage area remains, transmitting the information with said at least one further addressable coverage area to at least one further communication satellite of the plurality of communication satellites for crosslink transmission until the information has been transmitted to all addressable coverage area selected by the originator, thus facilitating transmission of the information to the predetermined termination unit.

17 more elements

A geographic area-selective low-earth satellite-based paging broadcast system comprising at least:

(A) an origination unit for at least a first originator, for, where transmission of a paging message is requested, providing a termination unit ID to a gateway for a selected terminator and transmitting the paging message to the gateway,
(B) a termination unit for at least a first terminator,
(C) a gateway comprising:
means for determining whether transmission of the paging message has been requested, and, where transmission of the paging message is unrequested, recycling to determining whether transmission of the paging message has been requested,
means for determining whether the originator has selected a customized preferred geographic area for transmitting the paging message, and, where the originator has selected said customized preferred geographic area utilizing said customized preferred geographic area,
where said customized preferred geographic area into which to transmit the paging message is unselected, determining whether a short term preferred geographic area has been selected,
where a short term preferred geographic area is unselected, utilizing a predetermined long term preferred geographic area,
where a short term preferred geographic area is selected, utilizing the predetermined short term preferred geographic area,
converting, where the short-term preferred geographic area is selected, the short-term preferred geographic area, and where the short-term preferred geographic area is unselected, converting the long-term preferred geographic area, to at least one corresponding addressable coverage area,
including at least the at least one corresponding addressable coverage area, the termination unit identification code, and the paging message in an information signal,
transmitting the information signal to at least one communication satellite of a plurality of communication satellites,
(D) the plurality of communication satellites comprising a plurality of addressable coverage areas, and means for facilitating an originator's utilizing an originator unit for transmitting the paging message to at least one corresponding addressable coverage area of the termination unit and at least one communication satellite of the plurality of communication satellites wherein said at least one communication satellite comprises:
means for determining whether the information signal includes said at least one corresponding addressable coverage area in said at least one communication satellite's broadcasting range,
means for removing said at least one corresponding addressable coverage area of its broadcasting range from the information signal,
means for broadcasting the paging information where said at least one corresponding addressable coverage area is in said at least one communication satellite's broadcasting coverage area,
means for determining whether further target corresponding addressable coverage area remain in the information signal,
where said further target corresponding addressable coverage area remain in the information signal, crosslinking to at least one further communication satellite of the plurality of communication satellites based on said further target corresponding addressable coverage area, then recycling to said at least one further communication satellite's determining whether said further target corresponding addressable coverage area remain in the information signal, and where all said further target corresponding addressable coverage area have been removed from the information signal, the paging message communication is complete.

14 more elements

Dependencies are inferred from the claim text.

Description4,393 words

Summary422 words

#The present invention relates generally to communication paging systems, and more particularly to paging systems for selective geographic areas within low-earth satellite-based communication network systems.

#Communication paging systems have traditionally broadcast pages to a system's entire coverage area. Such a system has been tolerable, though not efficient, for land-based systems. In addition, such a system does not readily allow for adjustment of selected coverage areas. However, a satellite-based paging system typically provides coverage to a larger geographical area than a land based-paging system. Thus, a satellite-based paging system typically expends a large amount of energy and/or capacity sending paging messages to areas in which a pageris not located in order to be sure that the pager receives its message. This is inefficient use of broadcasting resources.

#Thus, there is a need for a more efficient paging broadcast system and method for facilitating conservation of energy and/or capacity of the system.

Brief description of the drawings4 figures

#FIG. 1 illustrates a geographic area-selective low-earth satellite-based paging broadcast system in accordance with the present invention.

#FIG. 2 is a flow chart for a first embodiment of a geographic area-selective low-earth satellite-based paging broadcast method in accordance with the present invention.

#FIG. 3 is a flow chart of an embodiment of one embodiment of steps in the geographic area-selective low-earth satellite-based paging broadcast method in accordance with the present invention.

Detailed description3,858 words

#To facilitate conservation of energy and/or capacity of the communication paging system, the present invention employs a broadcast system and method for efficient utilization of selected areas of broadcast coverage. The terms termination unit, a radio communication paging unit (user is a terminator) and origination unit, an information entry device, (user is an originator) will be utilized to describe the present invention.

#In particular, a terminator having a pager for receiving paging messages selects a long-term preferred geographic area (LTPGA) and in addition, may select a short-term preferred geographic area (STPGA). Alternatively, an originator (i.e., one sending a paging message) may select a customized preferred geographic area (CPGA) into which to broadcast paging information (the paging message and a termination unit ID). Thus, an area to which a paging message is to be broadcast is limited.

#The present invention provides the advantages of allowing an originator to customize the broadcast coverage area over which the page is sent, and allows the terminator to change the broadcast areas easily (allowing at least two broadcast coverage areas). It minimizes satellite power consumption and maximizes the use of the allocated frequency band by allowing for small geographic broadcast areas.

Geographic-area selective low-earth satellite-based paging broadcast system and method

Life of this patent

Geographic-area selective low-earth satellite-based paging broadcast system and method

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims16

Description4,393 words

Drawings

Classification4 codes

Life of this patent

Description4,393 words