CS to IMS Hand-Back and Hand-in for IMS Systems for Legacy CS UE with Home Node B Access
AssigneeFuturewei Technologies, Inc.
InventorKaniz Mahdi
Life of this patent
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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.
Claims22
A method for performing wireless communications, the method comprising:
- establishing an IP multimedia system (IMS) bearer channel from a remote end to a home node B (HNB);
- establishing a circuit switch (CS) bearer channel from the HNB to a media gateway (MGW) to a mobile switching center (MSC) to a base station system (BSS) to a user equipment (UE);
- handing the CS bearer channel over from the BSS to the HNB;
- releasing the CS bearer channel from the HNB to the MGW to the MSC to the BSS;
- and
- transferring a service state and HNB Indication from an inter-working function (IWF) to the HNB.
A method for performing wireless communications, the method comprising:
- establishing a bearer channel between a remote end and a Multimedia Resource Function (MRF);
- establishing a first bi-cast IP multimedia system (IMS) bearer channel between the MRF and a home node B (HNB);
- establishing a second bi-cast IMS bearer channel between the MRF and a media gateway (MGW);
- establishing a circuit switch (CS) bearer channel from a CS core network to the MGW;
- handing the CS bearer channel over from the CS core network to the HNB;
- and
- releasing the second bi-cast IMS bearer channel after the handing over.
A method for performing wireless communications, the method comprising:
- establishing communications between a user equipment (UE) and a remote end, the communications passing through a media gateway (MGW);
- after the communications are established, establishing an IP multimedia system (IMS) bearer channel from the remote end to a home node B (HNB);
- establishing a circuit switch (CS) bearer channel from the HNB to the UE, the CS bearer channel passing through the MGW, wherein the communications are switched to the CS bearer channel;
- handing the CS bearer channel over from a base station system (BSS) to the HNB;
- and
- releasing the MGW after handing the CS bearer channel over from the BSS to the HNB.
A method for performing wireless communications, the method comprising:
- establishing an IP multimedia system (IMS) bearer channel from a remote end to a media gateway (MGW);
- establishing a first bi-cast channel from the MGW to a user equipment (UE), the first bi-cast channel extending through a base station system (BSS);
- establishing a second bi-cast channel from the MGW to a home node B (HNB)
- handing the UE over from the first bi-cast channel and the BSS to the second bi-cast channel and the HNB;
- and
- releasing the first bi-cast channel.
A method for performing wireless communications, the method comprising:
- establishing communications between a user equipment (UE) and a circuit-switched (CS) core network, the communications not passing through a media gateway (MGW);
- establishing a first bi-cast bearer channel from the CS core network through a mobile switching center (MSC) and a base station system (BSS) to the UE and a second bi-cast bearer channel from the CS core network to a home node B (HNB);
- handing communications with the UE over from the BSS to the HNB;
- and
- releasing the first bi-cast bearer channel such that the MGW remains in a bearer path after handing the communications over from the BSS to the HNB.
Dependencies are inferred from the claim text.