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A Novel Distributed SCIM Service Invocation Mechanism in IMS |
Qi Qi; Liao Jian-xin;Zhu Xiao-min;Cao Yu-fei |
State Key Laboratory of Networking and Switching Technology,
Beijing University of Posts and Telecommunications, Beijing 100876, China;
EBUPT Information Technology Co. Ltd., Beijing 100083, China |
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Abstract In the service invocation mechanism of current IMS (IP Multimedia System) network, the Serving-Call Session Control Function (S-CSCF) invokes each Application Server (AS) sequentially to perform user’s service profile. This mechanism makes SIP request be forwarded excessively among the S-CSCF and Application Servers (ASs), so it is easy to result in the heavy load of the S-CSCF entity and long call set-up delay. This paper proposes a novel Distributed SCIM (DSCIM) service invocation mechanism. It aims at reducing the call set-up delay in IMS service layer along with decreasing the load of the S-CSCF entity by invoking each AS consecutively without signaling being forwarded back to the S-CSCF. The service invocation mechanisms are modeled through Jackson network and the simulations of different scenarios verify that DSCIM service invocation mechanism can effectively reduce call set-up delay of the network and decrease the load level of the S-CSCF.
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Received: 09 August 2008
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