US 2006/0149812 A1 · System and method for accelerating call setup by caching

Abstract

The present invention provides a system and method for accelerating call setup by caching, wherein a user equipment accesses an IMS network via a radio access network and a GPRS core network. The GPRS core network has a HSS recorded with data associated with the user equipment. The IMS network comprises at least one S-CSCF and at least one I-CSCF. The I-CSCF has a cache device. At first, the user equipment sends a register signal which is forwarded to the I-CSCF, and the I-CSCF inquiries the HSS about the services that the user equipment has applied, so as to select an S-CSCF. Then, I-CSCF forwards the register signal to the selected S-CSCF, and the S-CSCF registers to the HSS as being mapped to the user equipment. Finally, when the I-CSCF receives an OK signal, the mapping between the user equipment and the S-CSCF is recorded in the cache device.

Claims15

Dependent claims

A method for accelerating call setup by caching, wherein a user equipment accesses an IP multimedia core network subsystem (IMS) network via a radio access network and a general packet radio service (GPRS) core network, the GPRS core network having a home subscriber server (HSS) recorded with data associated with the user equipment, the IMS network comprising at least one serving-CSCF (S-CSCF) and at least one interrogating-CSCF (I-CSCF), the I-CSCF having a cache device, the method comprising the steps of:

(A) the user equipment sending a register signal for registration, the register signal being forwarded to the I-CSCF, such that the I-CSCF inquiring the HSS about at least one service that the user equipment has applied as to select an S-CSCF;
(B) the I-CSCF forwarding the register signal to the selected S-CSCF, and the S-CSCF registering to the HSS as being mapped to the user equipment;
and
(C) the S-CSCF sending an OK signal to the I-CSCF, and the I-CSCF recording the mapping between the user equipment and the S-CSCF in the cache device when receiving the OK signal.

1 more element

A system for accelerating call setup by caching, wherein a user equipment accesses an IP multimedia core network subsystem (IMS) network via a radio access network and a general packet radio service (GPRS) core network, the system comprising:

a home subscriber server (HSS) located in the GPRS core network for recording data associated with the user equipment;
at least one serving-CSCF (S-CSCF) located in the IMS network for providing a variety of multimedia services to subscribers;
at least one interrogating-CSCF (I-CSCF) located in the IMS network;
and
a cache device located in the I-CSCF for recording the mapping between the user equipment and the S-CSCF when the user equipment processes a registration procedure for selecting a corresponding S-CSCF, such that when a caller sends an invite signal for requesting a call setup with the user equipment, the I-CSCF checks the cache device and finds the mapping between the user equipment and the S-CSCF, thereby the I-CSCF directly retrieving the mapping between the user equipment and the S-CSCF from the cache device so as to forward the invite signal to the corresponding S-CSCF.

2 more elements

Dependencies are inferred from the claim text.

System and method for accelerating call setup by caching

Life of this patent

System and method for accelerating call setup by caching

Life of this patent

Abstract

Claims15