Source: http://www.google.com/patents/US5596315?dq=inventor:%22Arthur+R.+Hair%22
Timestamp: 2014-07-28 10:31:40
Document Index: 125864678

Matched Legal Cases: ['arth 4', 'arth 4', 'arth 4', 'arth 4', 'arth 4', 'arth 4']

Patent US5596315 - Message unit for use with multi-beam satellite-based messaging system and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA satellite-based, world-wide cellular messaging system transmits paging messages to pagers via multiple beams. A message unit monitors multiple beams, recording the visit information for each beam, and ultimately determines the optimum beam to monitor for messages. The message unit, which conserves...http://www.google.com/patents/US5596315?utm_source=gb-gplus-sharePatent US5596315 - Message unit for use with multi-beam satellite-based messaging system and method of operation thereofAdvanced Patent SearchPublication numberUS5596315 APublication typeGrantApplication numberUS 08/317,084Publication dateJan 21, 1997Filing dateOct 3, 1994Priority dateOct 3, 1994Fee statusPaidAlso published asCA2201382A1, CN1063001C, CN1159864A, DE69534103D1, DE69534103T2, EP0786144A1, EP0786144A4, EP0786144B1, WO1996010834A1Publication number08317084, 317084, US 5596315 A, US 5596315A, US-A-5596315, US5596315 A, US5596315AInventorsKeith A. Olds, Gregory B. Vatt, Christopher N. KurbyOriginal AssigneeMotorola, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (7), Referenced by (24), Classifications (19), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetMessage unit for use with multi-beam satellite-based messaging system and method of operation thereofUS 5596315 AAbstract A satellite-based, world-wide cellular messaging system transmits paging messages to pagers via multiple beams. A message unit monitors multiple beams, recording the visit information for each beam, and ultimately determines the optimum beam to monitor for messages. The message unit, which conserves battery resources by entering into a sleep mode, synchronizes quickly to its message block when it awakes.
What is claimed is: 1. A method executed by an addressable call receiver receiver, said receiver having a sleep cycle and a wake cycle, said receiver being subjected to transmitted information in which a plurality of messages are grouped into a frame, a plurality of frames being grouped into a group, and a plurality of groups being grouped into a block, each of said frames having a frame header comprising frame, group, and block identification, predetermined frames each comprising a block header, said predetermined frames constituting an acquisition group, and said receiver storing an identification value identifying a block to which said receiver is assigned said method comprising the following steps:(a) exiting said sleep cycle and examining one of said transmitted frame headers; (b) if said block identification of said frame header matches said identification value, proceeding to step (c), otherwise proceeding to step (d); (c) determining from said group identification whether said frame is part of an acquisition group;(i) if so, said receiver monitors said acquisition group and proceeds to step (e); (ii) if not, said receiver proceeds to step (d); (d) using said frame identification to determine when it should awake from said sleep cycle; (e) entering said sleep cycle. 2. The method recited in claim 1, wherein said receiver stores a unique receiver address, wherein one of said frames comprises said unique receiver address, and further comprising the following step:(f) if step (c)(i) is satisfied, said receiver monitors each frame of said acquisition group for its address. 3. The method recited in claim 2, wherein said one frame further comprises a message, and further comprising the following step:(g) if, in step (f) said receiver detects its address, said receiver reads said message, otherwise said receiver continues to monitor said block for its address. 4. The method recited in claim 3, wherein said information is transmitted by several different beams, and wherein said block header comprises beam visit information as to whether a particular beam will be used to transmit information to said receiver and, if so, when information will be transmitted using said particular beam, and further comprising the following steps:(h) if said receiver detects its address and reads said message, said receiver selecting the beam that transmitted said message as the one it will monitor; and (i) said receiver storing said beam visit information corresponding to said block header. 5. The method recited in claim 4, and further comprising the following step:(i) using said stored beam visit information, said receiver waking up, during the remaining groups of its block, to monitor only said frames in which the monitored beams are visited. 6. The method recited in claim 1, wherein said information is transmitted by N different beams, N being a positive integer, and wherein said block header comprises beam visit information as to whether a particular beam will be used to transmit information to said receiver and, if so, when information will be transmitted using said particular beam, and further comprising the following steps:(f) said receiver monitoring said acquisition group information transmitted by a first beam; (g) if said receiver detects a block header within said acquisition group information, said receiver reads and stores said beam visit information; and (h) repeating steps (f) and (g) until all of said acquisition group has been transmitted. 7. The method recited in claim 6, and further comprising the following step:(i) said receiver selects the N beams having at least one optimum characteristic as the N beams it will monitor. 8. The method recited in claim 7, wherein said at least one optimum characteristic is signal strength.
TECHNICAL FIELD This invention relates generally to satellite cellular communications systems and, in particular, to a message unit for use with a multi-beam, satellite-based, world-wide cellular messaging system.
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an overview diagram of a satellite cellular communications system in accordance with the present invention. In accordance with a preferred embodiment, several satellites (also referred to as space vehicles or SV's) 1 are placed in a relatively low orbit around the earth 4. If, for example, satellites 1 are placed in orbits which are around 765 km above earth 4, then an overhead satellite 1 travels at a speed of around 25,000 km/hr with respect to a point on the surface of earth 4. This allows a satellite 1 to be within view of a point on the surface of the earth 4 for a maximum period of around nine minutes. Due to the relatively low orbits of satellites 1, line-of-sight electromagnetic transmissions from any one satellite cover a relatively small area of the earth 4 at any point in time. For example, when satellites 1 occupy orbits at around 765 km above the earth, such transmissions cover areas around 4075 km in diameter. Moreover, nothing prevents satellites 1 from incorporating directional antennas which further divide this area into smaller cells. As illustrated in FIG. 1, satellites 1 are preferably placed in orbits so that the entire constellation of satellites 1 provides continual coverage for the entirety of earth 4.
Description of Flow Diagram FIGS. 15-19 comprise a composite flow diagram of a method of operating an addressable call receiver, in accordance with the present invention.
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LLC;REEL/FRAME:025608/0043Owner name: CDC PROPRIETE INTELLECTUELLE, FRANCESep 12, 2008ASAssignmentOwner name: TORSAL TECHNOLOGY GROUP LTD. LLC, DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MOTOROLA, INC.;REEL/FRAME:021527/0213Effective date: 20080620May 13, 2008FPAYFee paymentYear of fee payment: 12Jun 29, 2004FPAYFee paymentYear of fee payment: 8Jun 27, 2000FPAYFee paymentYear of fee payment: 4Oct 3, 1994ASAssignmentOwner name: MOTOROLA, INC. 1303 EAST ALGONQUIN ROAD, ILLINOFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OLDS, KEITH ANDREW;VATT, GREGORY BARTON;KURBY, CHRISTOPHER NEIL;REEL/FRAME:007204/0502;SIGNING DATES FROM 19890923 TO 19940927RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google