System and method for mobility management for a satellite based packet data system
First Claim
Patent Images
1. A system for communication between a plurality of base stations via at least one of a plurality of satellites, said system comprising:
- a plurality of support node gateways adapted to at least one of receive and transmit communication signals with a plurality of mobile terminals via said base stations; and
a high speed network adapted to at least one of receive and transmit said communication signals between said base stations.
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Abstract
In a medium earth orbit (MEO) satellite system, an embodiment of the present invention employs a system and method for administering mobility management issues for mobile terminals, via a network of base station controllers. The mobility management issues, for example, paging, routing, and handover of communication signals are administered between the base station systems without having to be routed through the serving general packet radio service support node (SGSN).
39 Citations
32 Claims
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1. A system for communication between a plurality of base stations via at least one of a plurality of satellites, said system comprising:
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a plurality of support node gateways adapted to at least one of receive and transmit communication signals with a plurality of mobile terminals via said base stations; and
a high speed network adapted to at least one of receive and transmit said communication signals between said base stations. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for updating routing information by a base station associated with a mobile terminal within a communications network, said base station having a corresponding support node gateway for the geographic area in which said base station is located, said method comprising:
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transmitting signaling information from said mobile terminal to a first said base station;
processing said signaling information at said base station to determine when said mobile terminal is outside said geographic area corresponding to a first said support node gateway;
indicating to said base station to transmit said location information to a second said base station having a corresponding second said support node gateway when said mobile terminal is outside said geographic area corresponding to a first said support node gateway; and
deleting said location information from said base station of said mobile terminal associated with said first said support node gateway.
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9. A method for communicating between a plurality of base stations within a communications network, wherein one of said base stations adapted to correspond to a support node gateway, said base stations comprise a radio base station adapted to at least one of receive and transmit said communication signals from said mobile terminal communicating via said satellite and an anchor base station, said anchor base station adapted to at least one of receive and transmit said communication signals between said radio base station and said support node gateway, and wherein at least one of a plurality of mobile terminals are located within a geographic area corresponding to a support node gateway, said method comprising the steps of:
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receiving said communication signal from said mobile terminals;
framing said communication signal at said radio base station with said support node gateway identifier corresponding to said geographic area; and
transmitting said communication signal to said anchor base station corresponding to said support node gateway identifier. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21)
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19. A method for maintaining a routing table at one of a plurality of base stations to facilitate routing a plurality of communication signals between selected ones of said base stations, said selected ones of said base stations comprising an anchor and a radio base station, wherein said anchor base station corresponding to a mobile terminal and said radio base station corresponding to a spot beam selected by said mobile terminal, said method comprising:
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receiving one of said communication signals from said mobile terminal at said anchor base station;
storing said mobile terminal location at said anchor base station when said anchor base station is the same as said radio base station;
routing said communication signal from said anchor base station to said radio base station when said anchor base station is not the same as said radio base station; and
maintaining a routing table at said anchor base station comprising said mobile terminal and corresponding said anchor base station and said radio base station.
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22. A method for communicating the position of one of a plurality of mobile terminals between a selected ones of a plurality of base stations, said selected ones of said base stations comprising an anchor radio base station coupled to a support node gateway, wherein said anchor base station communicating with a mobile terminal and said radio base station corresponding to a spot beam selected by said mobile terminal, said method comprising:
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receiving said communication signal at said radio base station controller from said mobile terminal;
processing said communication signal at said radio base station controller transmitted from said mobile terminal to determine said mobile terminal'"'"'s position;
framing said communication signal at said radio base station controller with bits comprising said mobile terminal'"'"'s location within a geographic area;
transmitting said communication signal to said anchor base station;
maintaining said bits in memory of the said anchor base station controller; and
extracting said bits of said communication signal from said memory at said anchor base station for transmission to said mobile terminal. - View Dependent Claims (23, 24, 25, 28, 30)
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26. A method for processing a mobile terminal'"'"'s position at said base station, said mobile terminal'"'"'s position comprising bits with position information, said method comprising:
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accepting said position information bits by said mobile terminal from said base station when said bits are attached with communication signals comprising Attach Accept, Routing Area/Location Area Update Accept;
rejecting said position information bits by said mobile terminal when said communication signal from said base station comprises the absence of Attach Accept, Routing Area/Location Area Update Request Accept.
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27. A method for paging at least one of a plurality of mobile terminals in at least one of a plurality of spot beams of satellites by at least one of a plurality of satellite access gateways, and wherein said satellite access gateway comprises at least one of said base stations and a corresponding support node gateway, said method comprising:
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receiving a page from said one of a plurality of support nodes;
processing said page to determine location of said mobile terminal being paged by said satellite access gateways; and
transmitting said page directly to said mobile terminal when said mobile terminal is active; and
transmitting said page to said at least one of plurality of satellite access gateways when said mobile terminal is inactive.
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29. A method for purging the context of a mobile terminal as a mobile terminal physically moves from a first location to a second location, wherein said first location corresponds to a first anchor base station, and a second location corresponds to a second anchor base station, said method comprising:
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receiving a communication signal from said mobile terminal at said second anchor base station;
extracting the identity of said first anchor base station from said communication signal received from said mobile terminal; and
purging said context of said mobile terminal from said first anchor base station by at least one of receive and transmit said communication signals between said first and said second anchor base stations.
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31. A method to determine when to update a routing area identity information list comprising a time stamp, wherein a mobile terminal downloads said routing area identity information from a satellite via a communication signal within a communications network to determine when said mobile terminal is within said satellite spot beam, said method comprising;
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transmitting said communication signal from base station to said satellite for re-transmission to a plurality of said mobile terminals, said signal comprising timing information when said satellite spot beam will encompass different routing areas;
initiating a timer at said mobile terminal comprising the difference between a current time and the timing information corresponding to mobile terminal'"'"'s known routing area;
downloading said re-transmitted said communication signal from said satellite while said timer has not expired; and
triggering a Routing Area update when said timer expires. - View Dependent Claims (32)
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Specification