System and method providing secure access and roaming support for mobile subscribers in a semi-connected mode
First Claim
1. A method of providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM), said method comprising the steps of:
- establishing a first call from the mobile subscriber to a first access server;
establishing a point-to-point protocol (PPP) connection from the mobile subscriber to an Internet Protocol (IP)-based network through the first access server;
providing the mobile subscriber with an identifier for the first access server;
moving the connection to the SCM state when the mobile subscriber disconnects the first call;
receiving from the mobile subscriber, the identifier for the first access server, said identifier being received in a second access server that handles a subsequent call origination from the mobile subscriber to the IP-based network;
utilizing the identifier for the first access server to send from the second access server to the first access server, a Calling Number Identification (CNID) for the mobile subscriber;
establishing a PPP tunnel through the IP-based network between the first access server and the second access server;
tunnelling PPP packets from the second access server to the first access server; and
re-establishing the connection from the mobile subscriber to the IP-based network.
1 Assignment
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Accused Products
Abstract
A system and method for providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM). A point-to-point protocol (PPP) connection is established when an initial call is made from the mobile subscriber to an Internet Protocol (IP)-based network through a first access server (AS1). AS1 provides the mobile subscriber with an identifier for AS1 such as an IP address. The connection enters the SCM state when the subscriber disconnects the call. When the subscriber originates a subsequent call through a second access server (AS2), the subscriber uses the User-to-User Signalling (UUS) Supplementary Service to send the AS1 identifier to AS2. AS2 then sends a Calling Number Identification (CNID) for the subscriber to AS1. A PPP tunnel is established between AS1 and AS2, and AS2 tunnels PPP packets to AS1. The connection to the IP-based network is then re-established.
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Citations
20 Claims
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1. A method of providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM), said method comprising the steps of:
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establishing a first call from the mobile subscriber to a first access server;
establishing a point-to-point protocol (PPP) connection from the mobile subscriber to an Internet Protocol (IP)-based network through the first access server;
providing the mobile subscriber with an identifier for the first access server;
moving the connection to the SCM state when the mobile subscriber disconnects the first call;
receiving from the mobile subscriber, the identifier for the first access server, said identifier being received in a second access server that handles a subsequent call origination from the mobile subscriber to the IP-based network;
utilizing the identifier for the first access server to send from the second access server to the first access server, a Calling Number Identification (CNID) for the mobile subscriber;
establishing a PPP tunnel through the IP-based network between the first access server and the second access server;
tunnelling PPP packets from the second access server to the first access server; and
re-establishing the connection from the mobile subscriber to the IP-based network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM), said method comprising the steps of:
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establishing a first call from the mobile subscriber to a first access server;
establishing a point-to-point protocol (PPP) connection from the mobile subscriber to an Internet Protocol (IP)-based network through the first access server;
providing the mobile subscriber with an identifier for the first access server;
moving the connection to the SCM state when the mobile subscriber disconnects the first call;
receiving from the mobile subscriber, the identifier for the first access server, said identifier being received in a second access server that handles a subsequent call origination from the mobile subscriber to the IP-based network;
analyzing by the second access server, the identifier for the first access server to determine whether the second access server is the first access server;
if the second access server is the first access server;
determining whether a Calling Number Identification (CNID) for the mobile subscriber is recognized;
if the CNID is recognized, re-establishing the connection from the mobile subscriber to the IP-based network; and
if the CNID is not recognized, starting a new PPP setup to establish a new connection from the mobile subscriber to the IP-based network;
if the second access server is not the first access server;
sending from the second access server to the first access server, the CNID for the mobile subscriber;
determining whether the CNID for the mobile subscriber is recognized by the first access server;
if the CNID is recognized, using the CNID by the first access server to look up SCM data for the connection, establishing a PPP tunnel through the IP-based network between the first access server and the second access server, tunnelling PPP packets from the second access server to the first access server, and re-establishing the connection from the mobile subscriber to the IP-based network; and
if the CNID is not recognized, sending a negative reply from the first access server to the second access server, and starting a new PPP setup by the second access server to establish a new connection from the mobile subscriber to the IP-based network. - View Dependent Claims (9, 10, 11, 12)
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13. A system for providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM), said system comprising:
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a first access server that establishes a call and a point-to-point protocol (PPP) connection from the mobile subscriber to an Internet Protocol (IP)-based network;
a second access server that handles a subsequent call origination from the mobile subscriber to the IP-based network; and
a PPP tunnel between the first access server and the second access server;
wherein the first access server includes;
communication means for providing the mobile subscriber with an identifier for the first access server; and
means controlled by a PPP state machine for placing the connection in a Semi-Connected state when the mobile subscriber disconnects the call, and for placing the connection in a Network state when the mobile subscriber originates the subsequent call origination; and
wherein the second access server includes;
communication means for receiving the identifier for the first access server from the mobile subscriber, and for sending the Calling Number Identification (CNID) for the mobile subscriber from the second access server to the first access server; and
means for tunnelling PPP packets from the second access server to the first access server through the PPP tunnel;
whereby the connection from the mobile subscriber to the IP-based network is re-established. - View Dependent Claims (14, 15, 16)
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17. A network access server for providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM), said network access server comprising:
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means for receiving a call origination request from the mobile subscriber, said request including a Calling Number Identification (CNID) for the mobile subscriber;
means for establishing a point-to-point (PPP) connection from the mobile subscriber to the network;
means for providing the mobile subscriber with an identifier for the network access server;
means for storing SCM data for the connection and moving the connection to the SCM state when the mobile subscriber disconnects from the network access server;
means for receiving from a subsequent access server, the CNID of the mobile subscriber when the mobile subscriber originates another call request through the subsequent access server;
means for retrieving the SCM data using the CNID of the mobile subscriber; and
means for setting up a PPP tunnel through the network to the subsequent access server, said PPP tunnel re-establishing the connection from the mobile subscriber to the network by tunnelling PPP packets from the subsequent access server to the network access server. - View Dependent Claims (18)
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19. A network access server for providing secure access and roaming support for a mobile subscriber connected to a telecommunication network in a Semi-Connected Mode (SCM), said network access server comprising:
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means for receiving a call origination request from the mobile subscriber, said request including a Calling Number Identification (CNID) for the mobile subscriber and an identifier for a previous access server through which a point-to-point (PPP) connection was previously established from the mobile subscriber to the network;
means for sending from the network access server to the previous access server, the CNID for the mobile subscriber; and
means for setting up a PPP tunnel through the network to the previous access server in response to a request from the previous access server, said PPP tunnel re-establishing the connection from the mobile subscriber to the network by tunnelling PPP packets from the network access server to the previous access server. - View Dependent Claims (20)
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Specification