Integrated services user part (ISUP)/ session initiation protocol (SIP) gateway for unlicensed mobile access (UMA) emergency services call flow

• US 8,954,029 B2
• Filed: 07/15/2013
• Issued: 02/10/2015
• Est. Priority Date: 07/18/2005
• Status: Expired due to Fees

• Current Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Original Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Inventors: Mitchell, Don
• Primary Examiner(s): King, Simon
• Application Number:
  US13/942,029
• Publication Number:
  US 20130303196A1
• Time in Patent Office: 575 Days
• Field of Search: 455/404.1, 370/352, 379/37
• US Class Current: 455/404.1
• CPC Class Codes: G01S 5/0018 Transmission from mobile station to base station
• CPC Class Codes: H04L 65/103 in the network
• CPC Class Codes: H04L 65/1033 Signalling gateways
• CPC Class Codes: H04L 65/104 in the network
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/401 wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04M 2242/04 for emergency applications
• CPC Class Codes: H04M 2242/14 with services dependent on location
• CPC Class Codes: H04M 2242/30 Determination of the location of a subscriber
• CPC Class Codes: H04M 3/42348 Location-based services which utilize the location information of a target
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/123 where the packet-switched network is an Internet Protocol Multimedia System-type network
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/025 using location based information parameters
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 64/00 : Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 76/50 : for emergency connections
• CPC Class Codes: H04W 80/02 : Data link layer protocols
• CPC Class Codes: H04W 88/16 : Gateway arrangements

Abstract

An ISUP/SIP gateway is implemented to encapsulate SS7 location requests from a switched telephone network into an Internet protocol SIP message including one or more location objects. The ISUP/SIP gateway is implemented between a mobile switching center (MSC) and a VoIP positioning center (VPC) to provide support of unlicensed mobile access (UMA) voice over Internet Protocol (VoIP) call routing, e.g., for E9-1-1, 4-1-1, 2-1-1, etc. The disclosed location objects that are encapsulated into a SIP message includes calling party number, called party number, CGI, International Mobile Subscriber Identity (IMSI), mobility indicator, and/or access point MAC address. At the SIP/ISUP gateway, SS7 integrated services user part (ISUP) location request messages are encapsulated within SIP. The SIP encapsulated location request message is then routed over the Internet to a destination VoIP positioning center (VPC).

Claims

1. A SIP gateway, comprising:

a receiver to receive a location-based request message including a calling party ID, said location request message having been initiated via a non-SIP network element;

a SIP encapsulation module to encapsulate said location-based request message within a SIP message;

a transmitter to transmit said SIP message including said calling party ID to a positioning center;

a SIP message receiver module to receive another SIP message including location-based information, back from said positioning center; and

an initial message transmitter module to transmit an initial message including said location-based information back to said non-SIP network element.

2. The SIP gateway according to claim 1, wherein said positioning center comprises:

a Voice over Internet Protocol (VoIP) positioning center.

3. The SIP gateway according to claim 1, wherein said calling party ID comprises:

a calling party number.

4. The SIP gateway according to claim 1, wherein said SIP message comprises:

a SIP invite message.

5. The SIP gateway according to claim 1, wherein said location-based information comprises:

routing information.

6. The SIP gateway according to claim 5, wherein said routing information comprises:

a routing number.

7. The SIP gateway according to claim 6, wherein said routing number comprises:

an emergency services routing number (ESRN).