EP0454647A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus and method for directing calls to mobile telephone subscribers
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1991-04-25
•
Granted: —
•
Expires: 2011-04-25
Abstract
Abstract The present invention provides a mobile communications system in which the home exchange of a mobile subscriber maintains information indicative of where the mobile subscriber might be found. Upon receipt of a call, the home exchange requests the exchange where the mobile is believed to be located to page it and then requests the answering exchange(s) to order the mobile to tune to a voice/traffic channel. Only after the successful completion of this process does the answering exchange report this to the home exchange which then orders routing of the call through the network.
Inventors
- 👤 Nancy Buhl
- 👤 John Hayes
- 👤 Harald Kallin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 10:46
CPC Classifications
H; H04; H04W; H04W68/00; H04W68/12
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
95 words
A mobile communications system in which at least one mobile station may roam, said system comprising: a home exchange of said at least one mobile station; at least one visited exchange having a coverage area in which said mobile station may roam; an interrogation exchange for receiving incoming calls for said mobile station; and means responsive to the receipt of an incoming call for said mobile station by said interrogation exchange for locating said mobile station prior to routing the call from said interrogation exchange to the exchange in which said mobile station is located.
Claim 2
Dependent Claim
90 words
A mobile communication system as set forth in claim 1, wherein mobile station locating means comprises: means for obtaining information as to the location of the called mobile station; means for paging the called mobile station based upon said location information; means for receiving a page response from the paged mobile station and furnishing information to the interrogation exchange as to the explicit location of the called mobile station; and means responsive to said explicit location information for routing the call from the interrogation exchange to the called mobile station.
Claim 3
Dependent Claim
52 words
A mobile communication system as set forth in claim 2 which also includes: means responsive to receiving a page response from the paged mobile for designating a voice channel and for receiving confirmation of the voice channel designation for the called mobile station before sending explicit location information to the interrogation exchange.
Claim 4
Dependent Claim
48 words
A mobile communication system as set forth in claim 2 which also includes: means responsive to the failure to receive a page response from the paged mobile station for informing the interrogation exchange of that fact so that the incoming call can be terminated prior to routing thereof.
Claim 5
Dependent Claim
29 words
A mobile communication system as set forth in claim 2 in which said paging means includes: means for paging the called mobile station in a plurality of different locations.
Claim 6
Dependent Claim
45 words
A mobile communictions system as set forth in claim 5 wherein said paging means also includes: means for issuing a page request to a first exchange; and means within said first exchange for requesting other exchanges in an extended paging area to page the mobile.
Claim 7
Dependent Claim
50 words
A mobile communications system as set forth in claim 5 wherein said paging means also includes: means for issuing a page request to a first exchange; and means within said first exchange for causing said home exchange to request other exchanges in an extended paging area to page the mobile.
Claim 8
Dependent Claim
34 words
A mobile communications system as set forth in claim 5 wherein said paging means also includes: means for issuing a paging request to a first exchange and said first exchange is said home exchange.
Claim 9
Dependent Claim
34 words
A mobile communications system as set forth in claim 5 wherein said paging means also includes: means for issuing a page request to a first exchange and said first exchange is a visited exchange.
Claim 10
Dependent Claim
21 words
A mobile communications system as set forth in claims 6 or 7 wherein the extended paging area covers the home exchange.
Claim 11
Dependent Claim
23 words
A mobile communications system as set forth in claims 6 or 7 wherein the extended paging area covers a plurality of cooperating exchanges.
Claim 12
Dependent Claim
23 words
A mobile communication system as set forth in claim 5 wherein the called mobile is paged in said plurality of different locations simultaneously.
Claim 13
Dependent Claim
23 words
A mobile communication system as set forth in claim 5 wherein the called mobile is paged in said plurality of different locations sequentially.
Claim 14
Dependent Claim
28 words
A mobile communication system as set forth in claim 5 wherein the information as to the location of the called mobile station is obtained from the home exchange.
Claim 15
Dependent Claim
29 words
A mobile communication system as set forth in claim 5 wherein the information as to the location of the called mobile station is obtained from a home location register.
Claim 16
Dependent Claim
90 words
In a mobile communication system having a plurality of exchanges within which at least one mobile station may roam, a method for routing an incoming call from an interrogation exchange to the called mobile station, comprising: obtaining information as to the location of the mobile station; paging the called mobile station in a location in accordance with the information received; receiving a page response from the paged mobile station; and routing the incoming call from the interrogation exchange to the exchange which received the page response from the called mobile.
Claim 17
Dependent Claim
39 words
A method for call routing as set forth in claim 16 which also includes the step of: designating a specific voice channel designation for the called mobile and receiving a voice channel designation confirmation before routing the incoming call.
Claim 18
Dependent Claim
26 words
A method for call routing as set forth in claim 16 wherein said location information is obtained from the home exchange of the called mobile station.
Claim 19
Dependent Claim
22 words
A method for call routing as set forth in claim 16 wherein said location information is obtained from a home location register.
Claim 20
Dependent Claim
27 words
A method for call routing as set forth in claim 16 wherein said paging step comprises: paging the called mobile in a plurality of different possible locations.
Claim 21
Dependent Claim
24 words
A method for call routing as set forth in claim 16 wherein: said page response is received from an exchange which paged said mobile.
Claim 22
Dependent Claim
27 words
A method for call routing as set forth in claim 16 wherein: said paging response is received from an exchange other than one which paged said mobile.
Claim 23
Dependent Claim
155 words
A mobile communications system comprising: at least one mobile subscriber; a home exchange associated with said at least one mobile subscriber; one or more additional exchanges within which said at least one mobile subscriber may be presently located; means for maintaining information indicative of where said at least one mobile subscriber may be located; paging means, responsive to receipt of a call by an interrogation exchange directed to said at least one mobile subscriber, for selectively paging said at least one mobile subscriber in at least one of said home exchange and said one or more additional exchanges; reporting means, responsive to said paging means, for determining a present exchange within which said at least one mobile subscriber is presently located and for reporting said present exchange to said home exchange; and routing means responsive to said reporting means for routing said call to said at least one mobile subscriber within said reported present exchange.
Claim 24
Dependent Claim
59 words
A mobile communications system as set forth in claim 23 in which said reporting means also includes: means responsive to receipt of a page response from said at least one mobile subscriber for specifying a specific voice channel designation and receiving confirmation of the voice channel designation for said subscriber before actuating said routing means to route said call.
Claim 25
Dependent Claim
45 words
A mobile communication system as set forth in claim 23, also including: means responsive to a failure of said reporting means to determine a present exchange in which said at least one subscriber is located for notifying the calling party of failure of the call.
Claim 26
Dependent Claim
34 words
A mobile communications system as in claim 23 wherein said paging means is operative for simultaneously paging said at least one mobile subscriber in said registered exchange and said one or more additional exchanges.
Claim 27
Dependent Claim
34 words
A mobile communications system as in claim 23 wherein said paging means is operative for sequentially paging said at least one mobile subscriber in said registered exchange and said one or more additional exchanges.
Claim 28
Dependent Claim
29 words
A mobile communications system as in claim 23 wherein said reporting means is responsive to an unambiguous page response received from said paging means for determining said present exchange.
Claim 29
Dependent Claim
53 words
A mobile communications system as in claim 23 wherein said paging means is operative for attempting to connect a voice channel to said at least one mobile subscriber and said reporting means is responsive to successful connection of said voice channel to said at least one mobile subscriber for determining said present exchange.
Claim 30
Dependent Claim
28 words
A mobile communication system as set forth in claim 23, wherein said information maintaining means is located with the home exchange of said at least one mobile subscriber.
Claim 31
Dependent Claim
20 words
A mobile communication system as set forth in claim 23, wherein said information maintaining means is a home location register.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.