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中文摘要：
IMS（IP Multimedia Subsystem）网络中,S-CSCF（Serving Call Session Control Function）逐次匹配过滤准则的业务触发机制使呼叫信令在S-CSCF与AS（Application Server）之间多次转发,增加了S-CSCF实体的负载压力和呼叫延迟时间。该文在现有IMS业务提供框架的基础上,提出分布式SCIM（DSCIM）业务触发机制,完成了业务流程中AS到AS的连续业务触发,避免了S-CSCF与AS之间信令的往返转发。通过Jackson排队网络理论对业务触发机制进行了数学模型分析和仿真实验,结果均表明DSCIM业务触发机制能够有效降低网络的平均呼叫时延,减轻S-CSCF的负载压力。
英文摘要：
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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