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Exploring Application Layer Protocol Relationships in SoftSwitch

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China Communications 2009年第4期6卷 155-167页

作者： Zhu Xiaomin liao jianxin Chen Junliang Li Tonghong State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China EBUPT Information Technology Co. Ltd. Beijing 100191 China Technical University of Madrid 28660 Madrid Spain

Relationships between application layer protocols in softswitch are explored in this *** notions, *** relationship and protocol grouping, are proposed, which are not clearly defined and even not paid much attention to *** the basis of a well known protocol relationship named protocol conversion, three novel protocol relationships including protocol collaboration relationship, protocol cooperation relationship and protocol independent relationship are presented, so that protocol relationships are classified into four *** to the functionality and purpose of each protocol, main protocols related to softswitch are divided into five *** to protocol conversion in softswitch, information flow trail(IFT) is utilized to facilitate problem solving.A decision rule for protocol conversion mode is proposed to guide how to choose between direct conversion and indirect conversion.A property of protocol relationships in softswitch is induced from all kinds of service scenarios of *** property summarizes protocol relationships within each protocol group or between two specific protocol groups.A merit of protocol grouping together with classification of protocol relationship is also *** effort of this paper pushes the protocol engineering to go ahead.

关键词： protocol relationship protocol grouping softswitch information flow trail

Providing Customized Security Based on Network Function Composition and Reconfiguration

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China Communications 2016年第S1期13卷 177-189页

作者： HU Yuxiang LI Yufeng XING Chiqiang liao jianxin National Digital Switching System Engineering & Technological Research Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

Real-time multimedia sharing in Consumer-centric Multimedia Network(CMN) requires usability anywhere, anytime and from any device. However, CMNs are usually located or implemented on application layer, which makes CMNs subjected to their fixed substrate security framework. A fundamental diversifying attribute for the customized security experiences of CMNs is pressing. This paper proposes a programmable network structure which is named Service Processing Chain(SPC) based on network function combination. The SPC is established by the ordinal combination of network functions in substrate switches dynamically, and therefore constructs a special channel for each CMN with required security. The construction and reconfiguration algorithms of SPC are also discussed in this paper. Evaluations and implementation show that above approaches are effective in providing multilevel security with flexibility and expansibility. It is believed that the SPC could provide customized security service and drive participative real-time multimedia sharing for CMNs.

关键词： consumer-centric multimedia network customized security network function combination service processing chain

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既有建筑大跨度结构转换托梁抽柱施工技术

广东土木与建筑 2024年第5期31卷 68-72页

作者：朱朝聪廖健欣王营建泰建设有限公司广东珠海519090

为满足厂家对于空间的使用要求,对现有建筑物进行加固改造,此次改造使空间局部空间跨度由8 m变为16 m,在满足结构整体性和安全性的基础上,采用了先加固梁后拆除柱子的施工方式,满足建筑物的使用空间和使用功能的荷载要求。

关键词：既有建筑预应力梁张拉抽柱施工技术

An rFC based service triggering algorithm for IMS network

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High Technology Letters 2009年第2期15卷 162-169页

作者：荀兆勇 liao jianxin Zhu Xiaomin State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 P.R. China Eastcom-BUPT Information Technology Co. Ltd. Beijing 100083 P.R. China

To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS and the existing 3GPP service triggering algorithm （STA） based on initial filter eriteria （iFC） increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performanee, a SIP response message based filter criteria （rFC） was proposed. Based on the rFC, a SIP response message based STA （RSTA） was further proposed. The modeling and theoretical analysis of 3GPP STA and RSTA were presented. Simulation results show that, compared with 3GPP STA, the RSTA can avoid the additional signaling traffie load of the S-CSCF and application server （AS） effectively, reduce the session setup delay eonsiderably, increase the throughput of the S-CSCF and improve the quality of service （QoS） of IMS network.

关键词： signaling performance (STA) session initiation protocol (SIP) session setup delay filter criteria service triggering algorithm IP multimedia subsystem (IMS)

On the Connectivity of One-dimensional Vehicular Ad Hoc Networks

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China Communications 2010年第2期7卷 65-70页

作者： liao jianxin Li Yuanzhen Li Tonghong Zhu Xiaomin Zhang Lei 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 Technical University of Madrid Madrid Spain 28660

In this paper we analyze connectivity of one-dimensional Vehicular Ad Hoc Networks where vehicle gap distribution can be approximat- ed by an exponential distribution. The probabilities of Vehicular Ad Hoc Network connectivity for difference cases are derived. Furthermore we proof that the nodes in a sub-interval [z1, z1 ＋ △z] of interval [0,z],z 〉 0 where all the nodes are independently uniform distributed is a Poisson process and the relationship of Vehicle Ad hoc Networks and one-dimensional Ad Hoc networks where nodes independently uniform distributed in [zl, z1 ＋ △z] is explained. The analysis is validated by computing the probability of network connectivity and comparing it with the Mont Carlo simu- lation results.

关键词： Intelligent Transportation Systems (ITS) connectivity Vehicular Ad Hoc Networks onedimensional Ad Hoc Networks

A two-tier location management mechanism for IMS

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High Technology Letters 2009年第2期15卷 155-161页

作者：曹予飞 liao jianxin Qi Qi Zhu Xiaomin State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 P.R. China Eastcom-BUPT（EB） information Technology Ltd. Beijing 100190 P.R. China

This paper proposed a two-tier location management mechanism （TTLM） by improving the current registration mechanism （CR） in IP Multimedia Subsystem （IMS）. The TTLM includes the visited network registration and the home network registration, in which the visited network registration is responsible for re-registration in IMS. When subscriber roams, the location information of home network will be updated by the visited network based on the change of user equipment （UE）＇ s IP address. Thereibre the TTLM can reduce the times of IMS registration signaling. Using the proposed analytical model, the performance of the CR and the proposed TTLM were investigated. After the performance analysis of CR and TTLM by using proposed analytical model, the cost of CR in IMS could significantly be reduced theoretically and also was proven by simulation experiments.

关键词： two-tier location management (TTLM) registration IP Multimedia Subsystem (IMS)

STUDY ON THE ACCOUNT-SHARING STRATEGY FOR MULTI-SERVICES IN IMS ONLINE CHARGING MECHANISM

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Journal of Electronics(China) 2009年第4期26卷 456-465页

作者： Huang Hai liao jianxin Zhu Xiaomin State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

A prepaid subscriber is allowed to simultaneously implement multiple services in online charging mechanism of IP Multimedia Subsystem (IMS). It is a noteworthy discussion to effectively distribute the limited account resources among concurrent services. An account-sharing algorithm is proposed for multi-services,which introduces resource reclamation and redistribution processes based on the resource reservation of standard specifications and dynamically adjusts them according to the changes of Quality of Service (QoS). Three performance indexes are investigated in the simulation experiments, which are average number of accommodated sessions, average number of completed ses- sions, and average number of iterations per accommodated session. The results show that in the normal QoS level, the three indexes of the proposed algorithm averagely increase by 18.7%, 5.4%, and 3.1% compared with the Prepaid Credit Distribution (PCD) algorithm, and by 2.1%, 1.0%, and 1.8% compared with the Prepaid Credit Reclaim (PCR) algorithm. In the poor QoS level, the performance advantages are greater, which averagely increase by 29.1%, 7.1%, and 2.8% compared with PCD, and by 9.4%, 4.1%, and 3.6% compared with PCR.

关键词： IP Multimedia Subsystem (IMS) Online charging Account-sharing of multi-services Resource reclamation and redistribution

Difference-less mobility management network

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Frontiers of Electrical and Electronic Engineering in China 2009年第1期4卷 24-30页

作者： Xinrong LV jianxin liao Xiaomin ZHU Jiachun WU State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China EBUPT Information Technology Co.Ltd. Beijing 100083China

Core systemtechnology is a key factor in the next generation network(NGN).Adifference-less mobility management network is proposed to better support the mobility of an IP multimedia subsystem(IMS).This kind of network can provide good service and user mobility,enabling local user access to the network *** location management and session creation are *** results show that under this network architecture,the cost of the user location registration and session creation is lower than that of the home control model employed by the IMS.

关键词： difference-lessmobilitymanagement network location management session IP multimedia subsystem(IMS)

KeyEE:Enhancing Low-Resource Generative Event Extraction with Auxiliary Keyword Sub-Prompt

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Big Data Mining and Analytics 2024年第2期7卷 547-560页

作者： Junwen Duan Xincheng liao Ying An jianxin Wang Hunan Key Laboratory of Bioinformatics School of Computer Science and EngineeringCentral South UniversityChangsha 410083China Big Data Institute Central South UniversityChangsha 410083China

Event Extraction(EE)is a key task in information extraction,which requires high-quality annotated data that are often costly to *** classification-based methods suffer from low-resource scenarios due to the lack of label semantics and fine-grained *** recent approaches have endeavored to address EE through a more data-efficient generative process,they often overlook event keywords,which are vital for *** tackle these challenges,we introduce KeyEE,a multi-prompt learning strategy that improves low-resource event extraction by Event Keywords Extraction(EKE).We suggest employing an auxiliary EKE sub-prompt and concurrently training both EE and EKE with a shared pre-trained language *** the auxiliary sub-prompt,KeyEE learns event keywords knowledge implicitly,thereby reducing the dependence on annotated ***,we investigate and analyze various EKE sub-prompt strategies to encourage further research in this *** experiments on benchmark datasets ACE2005 and ERE show that KeyEE achieves significant improvement in low-resource settings and sets new state-of-the-art results.

关键词： natural language processing Event Extraction(EE) Multi-Prompt Learning(MPL) low-resource