دانلود رایگان مقاله مدیریت محل در شبکه تلفن همراه

Abstract

Location management is an important area of mobile computing. Location management in mobile network deals with location registration and tracking of mobile terminals. The location registration process is called location update and the searching process is called paging. Various types of location management methods exist such as mobility based location management, data replication based location management, signal attenuation based location tracking, time, zone and distance based location update etc. In this paper, existing location management schemes are discussed and compared with respect to their cost consumption in terms of bytes. Finally the key issues are addressed in the context of location management for future generation mobile network.

4. Conclusion

Location management is a key issue in the area of mobile computing. In order to provide best QoS to the subscribers, it is necessary to accurately track the location of MT to deliver a call to the user at low cost and low delay. Various existing location management approaches are discussed and compared in this paper to inspect the challenges in this field. Firstly the basic methods of location management are described. Rapid growing load for personal communication network along with the growth in number of active mobile subscribers, increase the number of location updates. This significantly consumes bandwidth and electronic power of handset battery along with high traffic. To reduce the traffic generated due to location update, various schemes are proposed. In these schemes a profile is maintained for individual MT to store and update the mobility information of that MT. This mobility information provides the probability of movement of each MT in each location area in the network. This helps to predict the movement pattern of the user for proper resource utilization. If location tracking is performed based on the short term or long term mobility information of the user, the scheme is known as mobility based location management scheme. By replicating mobility information of the MTs at frequently visited sites, location tracking cost can be reduced. Both of these mobility based or replication based schemes have their own advantages and limitations. In this paper a comparative analysis is performed between these two types of methods. To provide better QoS to the massive number of mobile users especially at indoor environment, femtocells are allocated inside the macrocells. Different location management schemes for macrocell–femtocell based LTE network are also discussed and compared with respect to their cost consumption and delay. Finally the future research scopes of location management are explored in this paper.