US6996087B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication system including an interworking mobile switching center for call termination
Assignee: Nokia of America Corp
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Filing: 2001-07-31
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Granted: 2006-02-07
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Expires: 2021-07-31
Abstract
Abstract A communication system includes User Equipment ( 111 ), Radio Access Network (RAN) ( 121 ), a packet-switched domain ( 131 ), an IP Multimedia Subsystem (IMS) ( 141 ), a circuit-switched domain ( 151 ), a Domain Name System (DNS) ( 165 ), a Charging Gateway Function (CGF) ( 134 ), an EIR ( 135 ), a Transport Signaling Gateway (T-SGW) ( 146 ), and a Roaming Signaling Gateway (R-SGW) ( 147 ). The CS domain ( 151 ) includes an interworking Mobile Switching Center (iMSC) ( 201 ). The iMSC ( 201 ) translates the CS domain registration, call control, feature control, and feature invocation procedures associated with the access technology to standard SIP procedures. The media gateway (MGW) ( 173 ) under the control of the iMSC ( 201 ) converts the air interface media flow into a packet stream that is managed by SIP procedures within the IMS ( 141 ). The iMSC ( 201 ) thereby allows for interworking between circuit-switched and packet-switched domains for call terminations.
Inventors
- 👤 Richard Paul Ejzak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:29
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/66; H04L51/00; H04L51/58; H04L69/00; H04L69/08; H04L69/085; H04L9/00; H04L9/40; H04W; H04W76/00; H04W76/10; H04W76/12; H04W80/00; H04W80/08; H04W80/10; H04W88/00; H04W88/16; H04W92/00; H04W92/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
172 words
A method for terminating a call request to a mobile unit being served by an interworking Mobile Switching Center (iMSC) in a communication system comprising a circuit-switched domain, and an Internet Protocol (IP) Multimedia Subsystem (IMS), the method comprising: sending from the mobile unit to the iMSC a circuit-switched domain registration message; sending from the iMSC to the IMS a registration indication on behalf of the mobile unit via SIP that identifies the iMSC as the current location at which the mobile unit can be reached; receiving a call intended for the mobile unit at the IMS; forwarding by the IMS the call intended for the mobile unit to the iMSC via Session Initiation Protocol (SIP) on an Mx interface, the Mx interface connecting the iMSC to a Call State Control Function (CSCF) in the IMS; sending by a Serving CSCF (S-CSCF) located in the IMS SIP messages; and perfomring by the iMSC interworking between SIP call control procedures on the Mx interface and circuit-switched call control procedures towards the mobile unit.
Claim 2
Independent Claim
172 words
A method for terminating a call request to a mobile unit being served by an interworking Mobile Switching Center (iMSC) in a communication system comprising a circuit-switched domain, and an Internet Protocol (IP) Multimedia Subsystem (IMS), the method comprising: sending from the mobile unit to the iMSC a circuit-switched domain registration message; sending from the iMSC to the IMS a registration indication on behalf of the mobile unit via SIP that identifies the iMSC as the current location at which the mobile unit can be reached; receiving a call intended for the mobile unit at the IMS; forwarding by the IMS the call intended for the mobile unit to the iMSC via Session Initiation Protocol (SIP) on an Mx interface, the Mx interface connecting the iMSC to a Call State Control Function (CSCF) in the IMS; sending by a Serving CSCF (S-CSCF) located in the IMS SIP messages; and perfomring by the iMSC interworking between SIP call control procedures on the Mx interface and circuit-switched call control procedures towards the mobile unit.
Claim 3
Dependent Claim
40 words
A method for terminating a call request in accordance with claim 1 , wherein the step of receiving a call intended for the mobile unit at the IMS comprises receiving a call request from a Public Switched Telephone Network (PSTN).
Claim 4
Dependent Claim
45 words
A method for terminating a call request in accordance with claim 2 , wherein the IMS receives the call request from the PSTN via a Media Gateway Control Function (MGCF), an Interworking Call State Control Function (I-CSCF), and a Serving Call State Control Function (S-CSCF).
Claim 5
Dependent Claim
37 words
A method for terminating a call request in accordance with claim 1 , wherein the step of receiving a call intended for the mobile unit at the IMS comprises receiving a call request from a second IMS.
Claim 6
Dependent Claim
40 words
A method for terminating a call request in accordance with claim 4 , wherein the IMS receives the call request from the second IMS via an Interworking Call State Control Function (I-CSCF) and a Serving Call State Control Function (S-CSCF).
Claim 7
Dependent Claim
40 words
A method for terminating a call request in accordance with claim 1 , wherein the step of receiving a call intended for the mobile unit at the IMS comprises receiving a call request from a Public Land Mobile Network (PLMN).
Claim 8
Dependent Claim
45 words
A method for terminating a call request in accordance with claim 6 , wherein the IMS receives the call request from the PLMN via a Media Gateway Control Function (MGCF), an Interworking Call State Control Function (T-CSCF), and a Serving Call State Control Function (S-CSCF).
Claim 9
Dependent Claim
37 words
A method for terminating a call request in accordance with claim 1 , wherein the step of receiving a call intended for the mobile unit at the IMS comprises receiving a call request from a SIP endpoint.
Claim 10
Dependent Claim
44 words
A method for terminating a call request in accordance with claim 8 , wherein the IMS receives the call request from the SIP endpoint via an IP multimedia network, an Interworking Call State Control Function (I-CSCF), and a Serving Call State Control Function (S-CSCF).
Claim 11
Dependent Claim
26 words
A method for terminating a call request in accordance with claim 8 , wherein the SIP endpoint is outside of the Public Land Mobile Network (PLMN).
Claim 12
Dependent Claim
32 words
A method for terminating a call request in accordance with claim 1 , wherein the step of sending by the S-CSCF SIP messages comprises sending the SIP messages directly to the iMSC.
Claim 13
Dependent Claim
39 words
A method for terminating a call request in accordance with claim 1 , wherein the step of sending by the S-CSCF SIP messages comprises sending the SIP messages to an Interworking Call State Control Function (I-CSCF) in the IMS.
Claim 14
Dependent Claim
23 words
A method for terminating a call request in accordance with claim 12 , wherein the I-CSCF forwards the SIP messages to the iMSC.
Claim 15
Dependent Claim
36 words
A method for terminating a call request in accordance with claim 1 , wherein the step of performing interworking between SIP call control procedures comprises mapping call states between SIP and an over-the-air call control protocol.
Claim 16
Dependent Claim
35 words
A method for terminating a call request in accordance with claim 1 , wherein the step of performing interworking between SIP call control procedures comprises mapping messages between SIP and an over-the-air call control protocol.
Claim 17
Dependent Claim
36 words
A method for terminating a call request in accordance with claim 1 , wherein the step of performing interworking between SIP call control procedures comprises mapping message parameters between SIP and an over-the-air call control protocol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2009-02-06 | 2009-08-08 | 2010-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-02-06 | 2013-08-08 | 2014-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-02-06 | 2017-08-08 | 2018-02-07 | $7700.00 | Window Closed / Lapsed |