Universal Personal Telecommunication Service Research Articles

Performance analysis of a fixed local anchor scheme for supporting UPT services

Intelligent Networks (INs) are well suited for implementing Universal Personal Telecommunication (UPT) services. For efficient planning of IN accommodating UPT services, it is essential to analyze the effect of UPT user personal mobility. In this paper, an IN architecture with a fixed local anchor (FLA) is proposed for supporting UPT services. The performance of the proposed IN architecture is compared with an IN architecture based on IS-41 with consideration of UPT user personal mobility in terms of call delivery cost and location update cost. The performance of the proposed IN depends on the characteristics of UPT user mobility and incall deregistration. The proposed IN yields better performance than an IN based on IS-41 as UPT user mobility decreases and the probability of explicit incall deregistration increases.

Update algorithm for replicated signaling databases in wireless and advanced intelligent networks

In the Personal Communication Networks (PCN), and the Universal Personal Telecommunications (UPT) services and possibly other services offered by the Advanced Intelligent Networks (AIN), customer records for call routing and other signaling functions can be distributed and replicated at multiple sites to improve access delay and system availability. We observe that these applications can tolerate data inconsistency among replicated records for a short period of time because the main consequence of accessing obsolete data is a small probability of call misroute. By exploiting this observation, we propose the Primary-Writer Protocol(PWP) as the concurrency control and commitment protocol for updating the replicated databases. The fraction of calls misrouted under the PWP is analyzed. Our results reveal that the fraction of calls misrouted under the PWP is very small for the expected customer behaviour in the PCN (wireless networks), and the UPT and other AIN services.

Future systems for personal mobility services: design, performance evaluation, and implementation

The intelligent network (IN) is a worldwide concept which specifies the functions, interfaces, and service-independent building blocks for the implementation of value-added services in digital telecommunication networks. One example is UPT (universal personal telecommunication), a service for fixed network mobility, which is presently being standardized. This paper describes the evaluation and implementation of an advanced UPT service, which allows a reachability control for ISDN based on the signaling system no. 7 (SS.7) and the intelligent network, which depends on the user's present social role (work, meeting, travel, vacation, etc.). The paper applies models of the users' communication habits, the components, and network services, develops simulation and queuing models for the traffic analysis and evaluation; and determines the call setup time for the new services as well as the quantitative load on the signaling network. Different scenarios for the distribution of the functionality of the intelligent network are studied. Two prototypes of the advanced UPT service are described: an integrated implementation placed in the network, and a standalone implementation outside the network. These prototypes have been displayed at several conferences and fairs. Services of this type are of interest in view of new competitive value-added services.

IN architectures for implementing universal personal telecommunications

This article focuses on architectures for providing universal personal telecommunications (UPT) service to wireline users. Although UPT services could be provided to users of wireless phones, thereby giving those users personal communication services (PCS), the wireline environment introduces certain important complications. Unlike "smart" cellular phones, which can register themselves and the user automatically, wireline telephones are unable to automatically detect and register a UPT user. UPT therefore includes a manual registration procedure to associate a PTN with the phone where calls will be received or placed. Also, unlike personal communications terminals that are typically used by only one person, wireline phones are likely to be shared among other users. Therefore, the network must keep track of who is using the phone, so it can provide the appropriate telecommunications services. It would be difficult or impossible to implement UPT as a switch-based service. Fortunately, an intelligent network (IN) architecture that is well suited for implementing UPT is being deployed by many local exchange (LECs) and interexchange carriers (IXCs).< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

高機能ディジタル移動通信網におけるモビリティ保証技術

Because of the explosive increase of the demand for mobile communications, construction in a new mobile communications network, which can be a huge infrastructural network, is needed. This new mobile communications network must also provide user oriented services such as Universal Personal Telecommunications (UPT) services. Such a network is referred to as Intelligent Digital Mobile communications Network (IDMN).In this paper, hierarchical IDMN architecture introducing the Intelligent Network (IN) architecture technology is proposed. And also, by keeping UPT service in consideration, network database configuration, database accessing method and pursuit transit switching capability to guarantee personal mobility and terminal mobility are described. Characteristics of signaling protocol applied to the IDMN, in which two mobilities are independently guaranteed, are described.