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 Title: |
US6256497:
Interworking between telecommunications networks
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Chambers, Paul; Buckinghamshire, United Kingdom
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| Assignee: |
ICO Services LTD, London, United Kingdom
other patents from ICO SERVICES LTD. (762886) (approx. 19)
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| Published / Filed: |
2001-07-03
/ 1998-03-24
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| Application Number: |
US1998000046673
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| IPC Code: |
Advanced:
H04B 7/185;
H04M 3/00;
H04M 11/00;
H04W 92/02;
H04W 84/06;
IPC-7:
H04Q 7/20;
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| ECLA Code: |
T04W84/06;
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| U.S. Class: |
Current:
455/433;
455/430;
455/445;
455/552.1;
455/560;
Original:
455/433;
455/560;
455/432;
455/435;
455/445;
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| Field of Search: |
455/414,435,445,561,450,454,560,432,433
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| Priority Number: |
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| Abstract: |
A mobile telephone (UT 1) is configured for dual mode operation, so as to communicate either via an earth-orbiting satellite 3a with a satellite network (SAN 1) or through a conventional land-based cellular network (PLMN 9). In order to provide interworking between the satellite network and the land, cellular network 9, an interworking function (IWF 31) provides data to the cellular network 9 concerning the location of the user terminal (UT 1) in relation to the satellite network. The data is transmitted from the satellite visitor location register (VLRSAT 1) to the home location register (HLR) of the cellular network 9. The IWF maintains a list of roaming subscribers provisioned with services which are specific to the visited network and not available in the home network. The (IWF 31) is configured to operate with local GSM, DAMPS, PHS or other local land-based networks, depending on the geographic location of the SAN.
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| Attorney, Agent or Firm: |
McDermott, Will & Emery ;
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| Primary / Asst. Examiners: |
Trost, William G.; Pierez-Gutierrez, Rafael
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| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
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| Designated Country: |
DE FI FR GB NL SE
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| Family: |
Show 3 known family members
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First Claim:
Show all 7 claims |
What is claimed is:
1. Mobile telecommunications apparatus including:
- a first mobile telecommunications network for use with a mobile user terminal for a subscriber to the first network, the first network including a home location register for maintaining a record of the network with which the subscriber is currently registered;
- a second mobile telecommunications network to which the subscriber's user terminal can roam, the second network including at least one visitor location register with which the user terminal becomes registered when roaming to the second network, and the second network offering a service to the subscriber not available through the first network; and
- an interworking function unit has been for providing interworking between the first and second networks, including:
- an interworking home location register to maintain a record of when the subscriber's user terminal becomes registered with a visitor location register of the second network and those of the services of the second network to which the subscriber is permitted access, whereby when the user terminal has roamed to the second network and registered with a visitor location register of the second network, the visitor location register is provided with data corresponding to said services to which access is permitted from the interworking function unit, and
- an interworking visitor location register coupled to the interworking home location register, the interworking visitor location register being operable to communicate to the home location register of the first network that the subscriber's user terminal has become registered with the visitor location register of the second network whereby when the user terminal has roamed to the second network and registered with the visitor location register of the second network, a call may be routed to the user terminal through the second network by being directed to the home location register of the first network such that the home location register obtains routing information through the interworking function unit for routing the call to the user terminal through the second network.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 136 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other Abstract Info: |
DERABS G1998-508853
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| Other References: |
"Globel Networking Model for Enhanced Services Represented by UPT", M. Fujioka et al., IEICE Transactions, vol. E74, No. 11, Nov. 1, 1991, pp. 3705-3718.
(14 pages)
Cited by 2 patents
[ISI abstract]
"Personal Communications Service-Concept and Architecture", J. Nguyen et al., Gateway To The Future-Technology In Motion, St. Louis, May 19-22, 1991, Institute of Electrical and Electronics Engineers, pp. 393-398.
"Intelligent Network: A Key Platform for PCS Interworking and Interoperability", S.S. Husain et al., IEEE Communications Magazine, vol. 34, No. 9, Sep. 1996, pp. 98-105.
(8 pages)
Cited by 2 patents
[ISI abstract]
Walker, J.G. "Satellite Patterns for Continuous Multiple Whole-Earth Coverage", International Conference on Maritime and Aeronautical Satellite Communication and Navigation, Mar. 1978, pp. 119-122.
Mouly, M. et al. "The GSM System for Mobile Communications", pp. 477-492.
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