Call Routing and Data Model for Inter-Network Roaming in PCS (Special Issue on Personal Communications)

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概要

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• Personal communication systems (PCS) have more signalling traffic than conventional fixed networks and require large-scale databases to manage users' profiles, which are sets of data items, such as the location the user is currently visiting and the user's authentication key, necessary for a PCS user to be provided with PCS services. This paper focuses on inter-network roaming in PCS environments. In designing a PCS supporting roaming service, it is essential to avoid increased signalling traffic and data searching time in the database. We first identify the appropriate domains for three routing schemes -Direction Routing, Redirection Routing, and Look-ahead Routing-from the viewpoints of the number of signals for inter-network roaming and roaming probability. We do this for two kinds of PCS database network architecture, Home Location Register (HLR) and Visitor Location Register (VLR), and show that Look-ahead Routing is the best scheme for the HLR network architecture (considering the number of signals for intra-network and inter-network database access) and that in the VLR network architecture, the decreasing of the roaming probability expands domains for which Redirection Routing is appropriate. We also propose a generic PCS data model that inter-network roaming interfaces can use to search effectively for a user's profile. The data model clarifies the contents of a set of data items which share certain characteristics, data items that the contents compose, and the relationships (data structures)between sets of data items. The model is based on the X. 500series recommendations, which are applied for an Intelligent Network. We also propose a data structure between sets of data items using the directory information tree and show the ASN. 1 notations of the data model.

• 社団法人電子情報通信学会の論文
• 1996-09-25

著者

• SUZUKI Shigefusa

  NTT Technology and Development Support Center

• Nakanishi Takao

  Ntt Technology And Development Support Center

関連論文

• Performance Evaluation of Terminating-Call Reforwarding Schemes for PCS (Special Issue on Personal Communications)
• Call Routing and Data Model for Inter-Network Roaming in PCS (Special Issue on Personal Communications)

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