With the rapid development of wireless communication technology,there is a urge requirement for the con-vergence of wireless and Internet. But the high BER, fading and occasionally occurred handoff in wireless network...
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With the rapid development of wireless communication technology,there is a urge requirement for the con-vergence of wireless and Internet. But the high BER, fading and occasionally occurred handoff in wireless networksheavily deteriorate the performance of traditional communication protocols such as TCP/UDP. This paper provides anoverview of the techniques which can improve data transmission over wireless links ,defines a taxonomy based on dif-ferent protocol layers ,and finally discusses the trends in this field.
The diversity of security requirements demands that information systems flexibly support policies,and uni-form policy description is important to implement policy-flexible system. This paper brings up new method to de...
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The diversity of security requirements demands that information systems flexibly support policies,and uni-form policy description is important to implement policy-flexible system. This paper brings up new method to descriptpolicies based on trace, which can be applied to many policies used currently. Subsequently this paper refines thismethod in order to be applicable to actual system ,and discusses how to merge multiple policies.
Constructing Virtual Private Network (VPN) over public network infrastructure (Internet) is becoming the foundation of the next generation network service. At present, VPN mainly focuses on the security property, whil...
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Constructing Virtual Private Network (VPN) over public network infrastructure (Internet) is becoming the foundation of the next generation network service. At present, VPN mainly focuses on the security property, while it is lack of consideration of QoS. On the basis of analyzing the Differentiated Services (Diffserv) and IPsec, we put forward a QoS-based IP VPN Architecture Model which is a tri-tier model that is composed of ESN, ISN and VPN node. It combines encrypted channel mechanism of IPsec and the edge-and-core-model of Diffserv. It provides end-to-end QoS while assures security.
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