Network Attachment for IMS Systems for Legacy CS UE with Home Node B Access
AssigneeFuturewei Technologies, Inc.
InventorsKaniz Mahdi, Zhaohui Zhang, Chunyan Ding
Life of this patent
Estimating the term…
Abstract
A system and method for allowing legacy circuit switch user equipment (CS UE) to operate via a packet switch system, such as an IP Multimedia Subsystem (IMS) system, is provided. The mobility and session control aspects of communications with the legacy CS UE is separated. A user agent is placed in the receiving node (e.g., a home node B) that acts as the SIP agent for the CS UE for session control. An interworking function is provided to allow mobility between the macro CS network and the PS (e.g., IMS) network. Hand-back and hand-in procedures with service continuity are also provided.
Claims17
A method for performing wireless communications, the method comprising:
- receiving an access gateway register request for a user, the access gateway register request indicating a network address for an access gateway and a subscriber identifier;
- verifying that the user is registered in a user database;
- storing the network address for the access gateway;
- and
- transmitting a register acknowledgement message.
A method for performing wireless communications, the method comprising:
- facilitating a circuit switch (CS) attach between a CS device and an inter-working function (IWF), the IWF acting as a mobile switching center (MSC) for CS devices accessing via a packet switch (PS) network;
- transmitting an access gateway register request, the access gateway register request indicating a network address for an access gateway and a subscriber identifier, the access gateway register request triggering a verification that the subscriber identifier is registered and triggering storage of the network address for the access gateway;
- and
- receiving an access gateway register acknowledgement message, the access gateway register acknowledgement message indicating that the CS device is verified.
A method for performing wireless communications, the method comprising:
- receiving an IP multimedia system (IMS) access authorization request for a user from an access point, the IMS access authorization request indicating a network address for the access point and a subscriber identifier;
- verifying that the user is registered via a circuit switch network;
- storing the network address for the access point;
- and
- transmitting an IMS access authorization acknowledgement message.
A method for performing wireless communications, the method comprising:
- facilitating a circuit switch (CS) attach between a CS device and an inter-working function (IWF), the IWF acting as a mobile switching center (MSC) for CS devices accessing via a packet switch (PS) network;
- transmitting by an access point an IMS access authorization request, the IMS access authorization request indicating a network address for an access point and a subscriber identifier, the access authorization request triggering a verification that the subscriber identifier is registered to use the access point and triggering storage of the network address for the access point;
- and
- receiving a register acknowledgement message, the register acknowledgement message indicating that the CS device is verified.
Dependencies are inferred from the claim text.