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| Programmable down-sampler having plural decimators and modulator using same |
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Communication system including an interworking mobile switching center for call termination
| Details |
Inventors: Ejzak, Richard Paul;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Ngo; Ricky
Assistant Examiner: Juntima; Nittaya
Attorney, Agent or Firm: MacIntyre; John B.
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. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention can be better understood with reference to FIGS.
1-6.
FIG.
1 depicts a communication system 100 in accordance with the present invention.
In an exemplary embodiment depicted in FIG.
1, communication system 100 is a Third Generation (3G) wireless system.
Communication system 100 can alternately be any digital cellular system.
3G wireless systems include multiple air interface standards, including cdma2000, Universal Mobile Telecommunications System (UMTS), Wideband CDMA (W-CDMA), Global System for Mobile Communications (GSM), and UWC-136, a TDMA-based technology.
FIG.
1 depicts 3GPP communication system 100 of a UMTS wireless network.
Communication system 100 includes logical elements that have been defined based on network functions that have been grouped together to form each logical element.
Actual implementation may contain multiple copies of these logical elements within multiple networks, and can merge any of these logical elements into single hardware entities.
The architecture of the present invention is designed to utilize emerging Internet standards and protocols.
An example of this is the use of Session Initiation Protocol (SIP) for IMS signaling for establishing a call.
Use of emerging internet-based protocols allows for the IMS to provide internet-like functionality and services to mobile units along with voice and data services.
Communication system 100 includes a plurality of logical elements, comprising User Equipment 111, Radio Access Network (RAN) 121, packet-switched domain 131, IP Multimedia Subsystem (IMS) 141, circuit-switched domain 151, DNS 165, Charging Gateway Function (CGF) 134, EIR 135, T-SGW 146, and R-SGW 147.
Both the UMTS-based and GSM/EDGE-based Radio Access Networks are show in this figure.
Charging Gateway Functionality (CGF) 134 has been added to the base 3GPP communication system 100 to show the collection of billing information in packet-switched domain 131.
As depicted in FIG.
1, Radio Access Network (RAN) and packet-switched domain 131 are independent of IMS 141
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