The Research Of Dynamic Policy Storage And Retrieving Mechanism Based On Concept Lattice

With the rapid development of Internet, and especially the strongimpulse of the relevant technology such as IPv6, Next GenerationNetwork and the 3rd Generation Mobile Communication, it makes that thepresent network has manifested characteristics, which has numerousbusiness and kinds of equipment, and is difficult to manage uniformly.Traditional network management based on SNMP(Simple NetworkManagement Protocol)has exposed obvious weaknesses. It regardsequipment as the centre, manages statically, and requires networkadministrators to know well the interface and names of various kinds ofequipment, which is difficult to reach the objectives of flexibility andefficiency.Policy based management has become a promising solution formanaging enterprise-wide networks and distributed systems. These aretypicallylarge-scale systems which require management solutions that areboth self-adapting and that dynamically change the behaviour of themanaged system.Policy is a set of rules to manage, configure and controlthe access to network resources. Policy Based Network Management(PBNM) is used to simplify network management. PBNM describes andimplements the high-level policyto manage the entire network rather thanindividual equipment. It translates policy into configuration commandsand implements these configurations through the network in order thatusers can manage and configure network equipment with the simplecommands. PBNM can provide automatic configuration of networkequipment, and ensure end-to-end network management, as well aspredicating and controlling preferential treatment. Network Managementcan be simplified while the network is regarded as an entity rather than acollectionofindividualnetworkequipment.Concept Lattice, also namely Formal Concept Analysis (FCA) is atheory of data analysis that identifies conceptual structures among datasets. It was introduced by Rudolf Wille in 1982 and has since then grownrapidly.Morethan250papers,includingseveral textbooks andconferenceproceedings,onthesubjecthavebeenpublished.Itsmethodofformaldataanalysis has successfully been applied to many fields, such as medicineand psychology, musicology, linguistic databases, library and informationscience,softwarere-engineering,civilengineering,ecology,andothers.Each node of concept lattice is a formal concept, which consists oftwo parts: extent (instance of concept); intent (description of concept andthe common propertyof instances). Concept lattice presents extensive andspecialist relations between concepts through Hasse chart vividly andbriefly.The background of this paper is dynamic resource allocation on thebasis of policy in the mobile IP handoff process. In this process, need tostorenewdynamicpolicy.Now the definition of policy is from the PCIM model , which isbrought by IETF. It ordains policy rules are composed of conditions andactions. Policy is stored in the directory server, using LDAP(Lightweight Directory Access Protocol ) to achieve a storage interactive.Currently IETF proposed LDAP access model is targeted at the passivesystematic of policyand can achieve the policywarehouse access, but notfortheneedofprocessingfunctionstoupdatebatchtransaction.Generally,LDAP only implements simple task of the update operation, suitable forlarge data retrieval. In this paper, the policy storage model aims todynamic policy, there is a lot of updating. Not as passive policy which isstored in directory server, it requires to be stored in the decision-makingPEP dynamically. Therefore, the target of this paper is to establish accessmechanismofdynamicpolicyonthebasisofconceptcharacteristics.At first, this paper gives a specific description of policy, then putsforward two storage schemes of policy according to the feature of policyexpression.Thefirst storetakes range set of all policyvariable as attributeof a form background, and descriptor of policy as an object. On the basisof this, it constructs the method of concept lattice; The second storageschemeconstructsconceptlatticeinallusiontopartialorderrelationshipinvalue range of a single variable of policy, there, the concept lattice is seentobenotattribute.Then,thecorrespondingpolicydescriptorwillbestoredinthelatticenodes.The main text of the paper are as follows : At first, the paperintroduces the basic idea, characteristics, framework of PBNM, and thebasicconcept of concept lattice,structurealgorithm,andso on; Accordingtothepolicyexpression,thepaperresearchestherelevanceofpolicyrange,and the method of making the policy background value single. Based onthis, it brings forward the first method of policy storage, and analysessome shortcomings of the method. Then it brings forward the secondstoragemethodandtherealizationmanner.Based on the study of policy expression, the paper brings forwarddynamic storage of policy on the basis of the concept lattice. This is notonly conducive to the dynamic insertion of policy, and provides aconvenientconditionsforfutureconflictdetectionofpolicy.