US6871070B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication system for providing roaming between an internet protocol multimedia system and a circuit-switched domain
Assignee: Nokia of America Corp
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Filing: 2001-07-31
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Granted: 2005-03-22
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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 provision of features and services while roaming between different kinds of home and serving systems.
Inventors
- 👤 Richard Paul Ejzak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:15
CPC Classifications
H; H04; H04W; H04W8/00; H04W8/02; H04W8/04; H04L; H04L51/00; H04L51/58; H04L65/00; H04L65/10; H04L65/102; H04L65/1043; H04L65/1066; H04L65/1101; H04L65/1104; H04L65/1016; H04W60/00; H04W60/04; H04W80/00; H04W80/08; H04W80/10; H04W92/00; H04W92/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A method for registering a mobile unit with a communication system including a serving system and a home system, the serving system comprising an interworking MSC (iMSC) and an Internet Protocol Multimedia Subsystem (IMS), the home system comprising a Gateway MSC (GMSC) and a Home Subscriber Server (HSS), the method comprising: performing a location update procedure by the mobile unit; processing by the serving system the registration by authenticating the mobile unit and informing the HSS of the location of the current serving system; determining that the serving system must process the mobile unit as an iMSC; and emulating the services of the iMSC by the IMS.
Claim 2
Independent Claim
107 words
A method for registering a mobile unit with a communication system including a serving system and a home system, the serving system comprising an interworking MSC (iMSC) and an Internet Protocol Multimedia Subsystem (IMS), the home system comprising a Gateway MSC (GMSC) and a Home Subscriber Server (HSS), the method comprising: performing a location update procedure by the mobile unit; processing by the serving system the registration by authenticating the mobile unit and informing the HSS of the location of the current serving system; determining that the serving system must process the mobile unit as an iMSC; and emulating the services of the iMSC by the IMS.
Claim 3
Dependent Claim
32 words
A method for registering a mobile unit in accordance with claim 1 , wherein the step of performing a location update procedure is done to indicate a change in the serving system.
Claim 4
Dependent Claim
25 words
A method for registering a mobile unit in accordance with claim 1 , further comprising the step of originating a call with the serving system.
Claim 5
Dependent Claim
72 words
A method for registering a mobile unit in accordance with claim 3 , wherein the step of originating a call with the serving system comprises: receiving a call request at the serving system; performing interworking between call control procedures between the iMSC and IMS; forwarding the call to a Border Gateway Control Function (BGCF) and Media Gateway Control Function (MGCF); and interworking between the MGCF and a Public Switched Telephone Network (PSTN).
Claim 6
Dependent Claim
33 words
A method for registering a mobile unit in accordance with claim 1 , further comprising the step of performing features and services for the mobile unit within the IMS in the serving system.
Claim 7
Dependent Claim
52 words
A method for registering a mobile unit in accordance with claim 1 , further comprising the steps of: receiving a call termination by the GMSC in the home system; forwarding the call termination to the IMS in the serving system; and forwarding the call termination to the iMSC in the serving system.
Claim 8
Dependent Claim
56 words
A method for registering a mobile unit in accordance with claim 6 , wherein the step of forwarding the call termination to the IMS comprises: forwarding the call termination from the GMSC to the MGCF; forwarding the call termination from the MGCF to the I-CSCF; and forwarding the call termination from the I-CSCF to the S-CSCF.
Claim 9
Independent Claim
99 words
A method for registering a mobile unit with a communication system including a serving system and a home system, the serving system comprising a mobile switching center (MSC) and an interworking MSC (iMSC), the home system comprising an Internet Protocol Multimedia Subsystem (IMS) and a Home Subscriber Server (HSS), the method comprising: performing a location update procedure by the mobile unit; processing by the serving system the registration by authenticating the mobile unit and informing the HSS of the location of the current serving system; and determining if the serving system can process the mobile unit as an iMSC.
Claim 10
Independent Claim
99 words
A method for registering a mobile unit with a communication system including a serving system and a home system, the serving system comprising a mobile switching center (MSC) and an interworking MSC (iMSC), the home system comprising an Internet Protocol Multimedia Subsystem (IMS) and a Home Subscriber Server (HSS), the method comprising: performing a location update procedure by the mobile unit; processing by the serving system the registration by authenticating the mobile unit and informing the HSS of the location of the current serving system; and determining if the serving system can process the mobile unit as an iMSC.
Claim 11
Dependent Claim
32 words
A method for registering a mobile unit in accordance with claim 8 , wherein the step of performing a location update procedure is done to indicate a change in the serving system.
Claim 12
Dependent Claim
25 words
A method for registering a mobile unit in accordance with claim 8 , further comprising the step of originating a call with the serving system.
Claim 13
Dependent Claim
64 words
A method for registering a mobile unit in accordance with claim 10 , wherein the step of originating a call with the serving system comprises: receiving a call request at the serving system; performing interworking between call control procedures by the iMSC in the serving system and the IMS in the home system; and forwarding the call from the IMS to the called party.
Claim 14
Dependent Claim
33 words
A method for registering a mobile unit in accordance with claim 8 , further comprising the step of performing features and services for the mobile unit within the IMS in the home system.
Claim 15
Dependent Claim
41 words
A method for registering a mobile unit in accordance with claim 8 , further comprising the steps of: receiving a call termination by the IMS in the home system; and forwarding the call termination to the iMSC in the serving system.
References Cited (Backward Citations)
US6011975A
Cited
US5862481A
Cited
US6359880B1
Cited
US6122263A
Cited
US6389008B1
Cited
US6731617B1
Cited
US6400950B1
Cited
US6567667B1
Cited
US6526033B1
Cited
US6317421B1
Cited
US20010031635A1
Cited
US6725036B1
Cited
US20020037723A1
Cited
US6546247B1
Cited
US6654606B1
Cited
US20020056001A1
Cited
US20020110104A1
Cited
US20020164984A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-03-21 | 2008-09-20 | 2009-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-03-21 | 2012-09-20 | 2013-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-03-21 | 2016-09-20 | 2017-03-22 | $7700.00 | Window Closed / Lapsed |