1,721,012 research outputs found
Performance analysis of a profile management scheme for incall registration deregistration in wireline UPT networks - Part I: Request-based scheme
No full textIn universal personal telecommunication (UPT) environments, CPT networks retain information related to incall/outcall registration in UPT user service profiles in order to provide incoming UPT calls for UPT users in any location who have registered at a terminal. As UPT networks support incall registration, terminal users can be different from terminal owners, and several UPT users can register fur incoming calls on a single terminal. Therefore, appropriate third-party protection procedures are needed to protect the rights of terminal owners. A terminal profile database can be used to store information regarding terminal states and incall UPT users registered on a terminal in order to enable third-party protection procedures. In order to manage information within both the terminal profile and the service profile, we propose a request-based scheme For incall registration/deregistration of UPT users and incall registration resets of terminal owners. We evaluate the performance of the scheme in terms of; 1) total cost and, 2) the number of terminal profile accesses per unit time for a terminal
Performance Evaluation of Intelligent Networks Accommodating Various IN Services as well as Basic ISDN Services
No full textEffect of personal mobility management in mobile communication networks
No full textPersonal mobility (PM) is one of the key issues in realizing personal communications service (PCS) in emerging third-generation mobile communication networks such as International Mobile Telecommunication 2000 (IMT-2000). It can be realized through universal personal,telecommunication (UPT) service. Two PM management schemes are proposed to manage PM information related to UPT users for incoming call (incall) registration/deregistration, incall registration reset by a mobile terminal (MT) owner, And incall delivery to UPT users in mobile communication networks based on the location information managed by the user's home network. The relative cost, i.e., the ratio of cost per unit time for supporting both terminal mobility (TM) and PM management to that of TM management, is derived, and the effect of PM management is analyzed from the aspects of update or query cost, Signaling delivery cost, and processing cost. These results can be utilized in the implementation of PM management in IMT-2000.
Performance analysis of two schemes for managing information related to incall registration in wireline UPT networks
No full textIn universal personal telecommunication (UPT) environments, UPT networks retain information related to incall registration in UPT user service profiles in order to provide incoming UPT calls for UPT users at any terminal in any location. As UPT networks support incall registration, terminal users can be different from terminal owners, and several UPT users can register on a single terminal for their incoming calls. Therefore, appropriate third-party protection procedures are needed to protect the rights of terminal owners from UPT users. A database called the terminal profile is needed to store the information of the terminal states and the incall UPT users registered on the terminal in order to carry out third-party protection procedures. In order to manage information within the terminal profile and the service profile, this article proposes two schemes, a request-based scheme and a timer-based scheme. The performance of the two schemes is compared in terms of the number of signaling messages transferred between a service switching point (SSP) and a service control point (SCP) per incall registration reset for a terminal. (C) 1999 Elsevier Science B.V. All rights reserved
Adaptive algorithm for mobile terminal power on/off state management
No full textTwo mobile terminal (MT) power on/off state management schemes are introduced based on the level of location registers (LRs) for managing the state information of MTs. The performance of the two MT power on/off state management schemes is compared based on the expected on/off duration and the expected number of incoming call arrivals between two consecutive detach and attach requests (call-to-transition ratio (CTR)). An adaptive algorithm is proposed here that incorporates both schemes for each mobile user. The results show that as the CTR value of a mobile user varies, the proposed algorithm adaptively selects an appropriate scheme in real time. (C) 2001 Elsevier Science B.V. All rights reserved
Mobility and traffic analyses in three-dimensional PCS environments
No full textWe need to solve various mobility/traffic problems in one-dimensional (1-D), two-dimensional (2-D), and three-dimensional (3-D) micro or picocell environments to efficiently plan future personal communications services (PCS's), However, mobility/traffic problems have thus far primarily been studied in 1-D and 2-D cell structures. In this paper, we extend the previous mobility modeling from 1-D or 2-D space to 3-D unbounded indoor building environments having staircase regions by analytically modeling mobility to estimate the number of handoffs, We also characterize the blocking probability of each cell according to mobility by predicting the equivalent input traffic per cell. Based on the blocking probability model, we obtain the required number of channels per cell under the given blocking probability constraint, For example, 13 channels per cell are required to be assigned in order to meet the requirement that the blocking probability does not exceed 0.02 in the case where the number of radio ports (RP's) (cells) is four and 180 users are moving with the mean 2 km/h (horizontal motion) and 2/3 km/h (vertical motion) on each floor. The computer simulation results are also close to the analytical ones. These results can be utilized in the network planning of future PCS's
A location management scheme to support non-geographic phone numbers in personal communications services
No full textSubscribers in future personal communications system (PCS) networks will be assigned portable personal numbers, or non-geographic phone numbers (NGPNs), which will not indicate the service provider and home location register (HLR) database: which serves the subscribers. A location management scheme for future PCSs based on a three-level hierarchical database architecture, which consists of a directory register (DR), regional location registers (RLRs), and visitor location registers (VLRs), is proposed under the assumption of local property in both called party distribution and user mobility. In addition to inherently providing non-geographic phone numbers, the proposed scheme reduces the number of database access attempts and the signaling cost for location management. (C) 2001 Elsevier Science B.V. All rights reserved
Analysis of satellite on-board time-space-time switching networks with multiple separated space switches
No full textAdvanced satellite on-board baseband switching processors have Time-Space-Time (T-S-T) structures which are similar to the terrestrial switching networks (Sw-Nw). Generally, the satellite systems require higher reliability than ground equipment because of more severe environment and lack of repair. This paper proposes fault-tolerant satellite on-board T-S-T Sw-Nw with multiple separated space switches instead of a single space switch. We analyze the mean time to unreliable operation (MTUO), as a performance & reliability index for the T-S-T systems with multiple separated space switches as well as conventional T-S-T systems. The MTUO vary depending on the threshold level of blocking-probability and the offered traffic. In general, T-S-T Sw-Nw with multiple space switches have better performance & reliability than those with the single space switch, and their performabilities are appreciably improved, especially for one additional spare space switch. This study can be extended to analyze the performance & reliability of entire satellite communication systems including the on-board baseband Sw-Nw, Rx interfaces, and Tx interfaces.This study was supported in part by Satellite Technology Research Center at KAIST and by the Korea Science & Engineering Foundatio
A new analytic method for IEEE 802.11 distributed coordination function
Full text linkIn this paper, we consider a network of N identical IEEE 802.11 DCF (Distributed Coordination Function) terminals with RTS/CTS mechanism, each of which is assumed to be saturated. For performance analysis, we propose a simple and efficient mathematical model to derive the statistical characteristics of the network such as the inter-transmission time of packets in the network and the service time (the inter-transmission time of successful packet transmissions) of the network. Numerical results and simulations are provided to validate the accuracy of our model and to study the performance of the IEEE 802.11 DCF network.The first author’s work was supported by the Korea Science
and Engineering Foundation(KOSEF) grant funded by the
Korea government(MOST) (No. R01-2007-000-20053-0)
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