By Karen Q. Tian
ISBN-10: 140207896X
ISBN-13: 9781402078965
ISBN-10: 1402078978
ISBN-13: 9781402078972
This well timed booklet is a finished remedy of coping with mobility in instant networks. major new perception is usually supplied into options to dossier allocation difficulties, particularly information replication, confronted in dispensed database structures by means of computing device Scientists. a number of the ideas are functions from the final facility position difficulties in Operations Research.The authors completely examine replication for hierarchical mobility administration the place the underlying community types a tree-like constitution. a variety of challenge formulations are thought of that supply new perception into extra finished options. The off-line replication challenge is decreased to difficulties in discrete position idea for which effective dynamic programming recommendations exist for tree networks. to resolve the online replication challenge, a unified framework is tested that offers distinctive visible illustration of the final resolution constitution. This framework not just demonstrates the correspondence among formerly proposed online algorithms but in addition offers the root for brand spanking new algorithms and expands the applicability of the unique challenge formula. All algorithms derived during this e-book were carried out and simulated utilizing real looking site visitors types. Their functionality is in comparison with formerly proposed algorithms.Mobility administration In instant Networks: facts Replication recommendations and purposes is a superb reference for engineers, laptop scientists, operations researchers and others operating in mobility administration in addition to in similar fields together with allotted database platforms, info administration and facility situation.
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Extra resources for Mobility Management in Wireless Networks
Sample text
32 MOBILITY MANAGEMENT IN WIRELESS NETWORKS Minimum-cost Maximum-flow Algorithm Shivakumar et al. [76] considered replications for HLR/VLR. The replication problem is formulated as a network flow problem, where the network nodes consist of user profile and database a flow from a user profile to a database corresponds to replicating user profile at database and the cost associated with such a flow is defined as the difference between the benefit and overhead of replication. The capacity of a database is limited, so is the maximum number of replicas allowed for each user profile.
Mobility Management 19 cation lookup cost. While a cached user profile may be out-of-date since it is not updated when the user’s location changes, a profile replication technique [76] ensures that all profile replicas are updated whenever the user’s location changes. The trade-off is between the benefit and overhead of replication. Other research efforts involve designing efficient call setup protocols in conjunction with the MMTs [40] [20]. To support UPI, a Meta-HLR scheme was proposed that builds upon the existing location databases and modifies HLR/VLR to accommodate location independent UPI [79].
To alleviate this problems, Mao [61] and Dolev [22] proposed alternative data and tree structures, respectively. End-to-end service delay for a hierarchical structure was evaluated using queuing models in [26, 71]. 3 Profile Replication What is profile replication? It is putting a copy of the user profile where it is needed the most. The difference between caching and replica- Mobility Management 23 tion is that the cached user profile information does not undergo changes if the user’s location changes, while the user profile replica is updated whenever the user’s location changes.
Mobility Management in Wireless Networks by Karen Q. Tian
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