Method and apparatus for media independent handover
First Claim
1. A method of performing a handover, the method comprising:
- an Internet protocol (IP) multimedia subsystem (IMS) client registering with an IMS network;
the IMS client establishing a media independent handover (MIH) session with an MIH application server using a session initiation protocol (SIP) by sending an INVITE request from the IMS client to a proxy call session control function (P-CSCF), the INVITE request including a string “
MIH services” and
a unique identifier of an IMS client;
the IMS client establishing a session for IP-based service with a communication peer using an SIP;
the IMS client exchanging an MIH message for a handover with the MIH application server over an IP;
the IMS client performing a handover;
the IMS client sending a RE-INVITE request or a REFER request to resume the session for IP-based service, the RE-INVITE request and the REFER request including a string “
MIH services” and
the unique identifier of the IMS client; and
the IMS client resuming the session for IP-based service.
1 Assignment
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Accused Products
Abstract
A method and apparatus for performing a handover are disclosed. An Internet protocol (IP) multimedia subsystem (IMS) client registers with an IMS network and establishes a media independent handover (MIH) session with an MIH application server using a session initiation protocol (SIP). The IMS client establishes a session for IP-based service, (e.g., voice over IP (VoIP)), with a communication peer using an SIP. MIH messages are exchanged for handover with the MIH application server over IP. After handover, the session is resumed. A serving call session control function (S-CSCF) triggers the MIH application server based on a string “MIH services” and a unique identifier included in an INVITE request. The IMS client may send a REFER request to the MIH application server after the handover to resume the session. Alternatively, the IMS client may send a RE-INVITE request to the MIH application server and the communication peer.
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Citations
20 Claims
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1. A method of performing a handover, the method comprising:
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an Internet protocol (IP) multimedia subsystem (IMS) client registering with an IMS network; the IMS client establishing a media independent handover (MIH) session with an MIH application server using a session initiation protocol (SIP) by sending an INVITE request from the IMS client to a proxy call session control function (P-CSCF), the INVITE request including a string “
MIH services” and
a unique identifier of an IMS client;the IMS client establishing a session for IP-based service with a communication peer using an SIP; the IMS client exchanging an MIH message for a handover with the MIH application server over an IP; the IMS client performing a handover; the IMS client sending a RE-INVITE request or a REFER request to resume the session for IP-based service, the RE-INVITE request and the REFER request including a string “
MIH services” and
the unique identifier of the IMS client; andthe IMS client resuming the session for IP-based service. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of performing a handover, the method comprising:
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receiving an INVITE request from an Internet protocol (IP) multimedia subsystem (IMS) client via a serving call session control function (S-CSCF), the INVITE request including a string “
MIH services” and
a unique identifier of the IMS client;creating a binding for the IMS client; establishing a media independent handover (MIH) session with the IMS client using a session initiation protocol (SIP); sending a handover command to the IMS client; receiving a handover result from the IMS client; receiving a RE-INVITE request or a REFER request from the IMS client, the RE-INVITE request and the REFER request including a string “
MIH services” and
a unique identifier of an IMS client; andupdating the binding. - View Dependent Claims (8, 9, 10)
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11. A wireless transmit/receive unit (WTRU) for performing a handover, the WTRU comprising:
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a transceiver; a processor configured to establish a session for IP-based service with a communication peer using a session initiation protocol (SIP); the processor configured to establish a media independent handover (MIH) session with an MIH application server using an SIP and perform a handover so that the session for IP-based service is resumed after the handover; and the processor configured to exchange an MIH message with the MIH application server over an IP, wherein the MIH session is established by sending an INVITE request to a proxy call session control function (P-CSCF) and a RE-INVITE request or a REFER request is sent to the MIH application server after handover to resume the session for IP-based service, the INVITE request, the RE-INVITE request and the REFER request including a string “
MIH services” and
a unique identifier of an IMS client. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A media independent handover (MIH) application server for supporting a handover, the MIH application server comprising:
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a receiver for receiving an INVITE request from an Internet protocol (IP) multimedia subsystem (IMS) client via a serving call session control function (S-CSCF), the INVITE request includes a string “
MIH services” and
a unique identifier of an IMS client;a processor for creating a binding for the IMS client and establishing an MIH session with the IMS client, the processor is configured to update the binding based on a RE-INVITE request or a REFER request from the IMS client, the RE-INVITE request and the REFER request including a string “
MIH services” and
the unique identifier of the IMS client; andthe processor for exchanging an MIH message for a handover with the IMS client over an IP. - View Dependent Claims (18, 19, 20)
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Specification