Simulated Annealing for Location Area Planning in Cellular networks

LA planning in cellular network is useful for minimizing location management cost in GSM network. In fact, size of LA can be optimized to create a balance between the LA update rate and expected paging rate within LA. To get optimal result for LA planning in cellular network simulated annealing algorithm is used. Simulated annealing give optimal results in acceptable run-time.Comment: 7 Pages, JGraph-Hoc Journa

A directionally based bandwidth reservation scheme for call admission control

This paper proposes a new advanced Call Admission Control(CAC) strategy involving for the first time, a bandwidth reservation scheme that is influenced by the direction attribute of a mobile terminal (MT). Aside from the Quality-of-Service (QoS) parameters, the direction attribute plays a key role in efficiently reserving resources for MTs supporting multimedia communications for different QoS classes. The framework for a direction-based CAC system is entirely distributed and may be viewed as a message passing system, where MTs inform their neighbouring base stations (BS) not only of their QoS requirements, but also of their mobility parameters. The base stations then predict future demand and reserve resources accordingly, only admitting those terminals that can be adequately supported. The bandwidth reservation scheme proposed in this paper, integrates the direction attribute into the conventional Guard Channel (GC) scheme. Simulation results prove that this new scheme offers significant improvements in both Call Blocking Probability (CBP) and bandwidth utilization, under a variety of differing traffic conditions

Mobility Management in beyond 3G-Environments

Beyond 3G-environments are typically defined as environments that integrate different wireless and fixed access network technologies. In this paper, we address IP based Mobility Management (MM) in beyond 3G-environments with a focus on wireless access networks, motivated by the current trend of WiFi, GPRS, and UMTS networks. The GPRS and UMTS networks provide countrywide network access, while the WiFi networks provide network access in local areas such as city centres and airports. As a result, mobile end-users can be always on-line and connected to their preferred network(s), these network preferences are typically stored in a user profile. For example, an end-user who wishes to be connected with highest bandwidth could be connected to a WiFi network when available and fall back to GPRS when moving outside the hotspot area.\ud In this paper, we consider a combination of MM for legacy services (like web browsing, telnet, etc.) using Mobile IP and multimedia services using SIP. We assume that the end-user makes use of multi-interface terminals with the capability of selecting one or more types of access networks\ud based on preferences. For multimedia sessions, like VoIP or streaming video, we distinguish between changes in network access when the end-user is in a session or not in a session. If the end-user is not in a session, he or she needs to be able to start new sessions and receive invitations for new sessions. If the end-user is in a session, the session needs to be handed over to the new access network as seamless as possible from the perspective of the end-user. We propose an integrated but flexible solution to these problems that facilitates MM with a customizable transparency to applications and end-users

Development of Multilevel Distributed Database Architecture for Solving (GSM) Centralized Database Accessing Problem in Nigeria

Telecommunication is the basis of economic and political growth of any society. Since the advent of GSM in Nigeria, different operator have been battling with diverse challenges which erupted as a result of GSM growth and increased in number of GSM users. These challenges result in calls delay and poor quality of service which can be link to central database system. In this research work, a multilevel distributed database architecture for GSM network in Nigeria was developed and propose. It explores the use of the analytical model and numerical calling process algorithms for each location. The call arrival rate traffic to a database system is determine using mapping process ranging from state to region and finally to the center. Keywords: key Communication, Architecture, multi-level, centralized, networ

Location management and multimedia communication service based on mobile IP and cellular IP network

[[abstract]]Wireless communication that provides voice only is not sufficient to support the necessity of user. It is an important feature of future wireless communication to offer this capability through mobile Internet. Mobile IP allows mobile hosts to change their location and reduce the losing probability of data packets in wireless communication networks. However, Mobile IP still have some defects in handoff and route aspects. Therefore, Cellular IP protocol is proposed for routing of IP diagrams to mobile stations and fast handoff control in a limited geographical area. In this paper, a handoff method is proposed to improve Quality of Service and resource switching management to reduce data packet loss for mobile multimedia communication in hierarchical network. In the future, all-IP network and mobile multimedia communication are two important characteristics, so that IP macromobility and micromobility network architecture are combined for data packets transfer. A Soft-handoff method is also presented to improve Quality of Service (QoS) and resource switching management to reduce data packet loss.[[notice]]補正完畢[[notice]]補正完畢[[conferencetype]]國際[[conferencedate]]20030327~20030329[[iscallforpapers]]Y[[conferencelocation]]Xi'an, Chin

Enhanced cell visiting probability for QoS provisioning in mobile multimedia communications

This paper presents an enhanced cell visiting probability (CVP) estimation technique by integrating both mobility parameters such as position, direction, and speed together with exponential call duration probability of mobile units. These improved CVP estimates can be used in both adaptive and nonadaptive mobile networks to enhance QoS parameters. This paper also presents a new shadow-clustering scheme based on these enhanced CVPs, which is then applied to the call admission control scheme similar to the one, called predictive mobility support QoS provisioning scheme, proposed by Aljadhai and Znati (2001). Simulation results confirm that this new shadow-clustering scheme outperforms predictive mobility support QoS provisioning scheme in terms of different QoS parameters under various different traffic conditions

Mobility management of IP-based multi-tier network supporting mobile multimedia communication services

[[abstract]]Wireless communication that provides voice only is not sufficient to support the needs of users. It is an important feature of next generation wireless communication to offer this capability through mobile Internet. Mobile IP allows mobile hosts to change their location and reduce the probability of losing data packets in wireless communication networks. However, Mobile IP still has some defects in handoff and routing aspects. Therefore, the cellular IP protocol is proposed for routing of IP datagrams to mobile stations and fast handoff control in a limited geographical area. It can cooperate with mobile IP to provide wide area mobility support. In this paper, a handoff method is proposed to improve quality of service and resource switching management to reduce data packet loss for mobile multimedia communication in cellular IP and mobile IP networks.[[notice]]補正完畢[[conferencetype]]國際[[conferencedate]]20020702~20020705[[iscallforpapers]]Y[[conferencelocation]]Vienna, Austri