A new location management strategy based on user mobility pattern for wireless networks
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For a wireless network to effectively deliver services to the mobile users, it must have an efficient way to track then. The location management fulfills this task through location registration and paging. Many location management strategies, such as the profile-based scheme (PBS) have been proposed to reduce the signaling traffic caused by the location update and paging. In the PBS scheme, the system collects the user mobility history and stores the information in the user profile. If the user follows the pattern, no update is needed. When a call arrives, the user is paged in the location areas in the descending order of probabilities until the user is found. In this paper, we propose a new scheme - MPBS: mobility-pattern-based scheme - which incorporates both the mobility pattern and time information in the profile. The user location is determined by the system based on not only the distribution probability but also the system time. In the MPBS scheme, a mobile user can be in one of four identified states and different location update and paging strategies are used for different states. Performance evaluation of the proposed scheme is carried out under various mobility-call patterns, paging cost and distribution probability. The results show that the MPBS scheme incurs significantly less signaling traffic and less paging delay than the PBS scheme.Keywords:
Paging
Mobility management
Mobility model
An efficient mobility management for mobile stations plays an important role in mobile communication network. Two basic operations of mobility management are location registration and paging. A zone-based registration (ZBR) is implemented in most of mobile communication systems and we consider the mobility management scheme that combines a zone-based registration and a selective paging (SP). We propose new analytical model that can reflect on the characteristics of the ZBR based on 2-dimensional random walk mobility model and more efficient paging schemes considering the proposed model. We evaluate the performance of the mobility management scheme with our mobility model to determine the optimal size of location area that will result in the minimum signaling traffic on radio channels. Numerical results are provided to demonstrate that our mobility model is useful to evaluate the ZBR more exactly.
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Mobility management
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For a wireless network to effectively deliver services to the mobile users, it must have an efficient way to track then. The location management fulfills this task through location registration and paging. Many location management strategies, such as the profile-based scheme (PBS) have been proposed to reduce the signaling traffic caused by the location update and paging. In the PBS scheme, the system collects the user mobility history and stores the information in the user profile. If the user follows the pattern, no update is needed. When a call arrives, the user is paged in the location areas in the descending order of probabilities until the user is found. In this paper, we propose a new scheme - MPBS: mobility-pattern-based scheme - which incorporates both the mobility pattern and time information in the profile. The user location is determined by the system based on not only the distribution probability but also the system time. In the MPBS scheme, a mobile user can be in one of four identified states and different location update and paging strategies are used for different states. Performance evaluation of the proposed scheme is carried out under various mobility-call patterns, paging cost and distribution probability. The results show that the MPBS scheme incurs significantly less signaling traffic and less paging delay than the PBS scheme.
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This paper investigates mobility management strategies from the point of view of their need of signalling and processing resources on the backbone network and load on the air interface. A method is proposed to model the serving network and mobile node mobility in order to be able to model the different types of mobility management algorithms. To obtain a good description of the network we calculate parameters from given topologies that we think are the most important ones. Mobility approaches derived from existing protocols and other, possible mobility scenarios are analyzed and their performance is numerically compared in various network and mobility scenarios. The aim is to give general designing guidelines for the next generation mobility managements on given network and mobility properties.
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In this paper, we study, Interworked fixed and mobile networks, both terminal mobility (TM) and personal mobility (PM) should be supported and interworked to provide seamless universal mobility to mobile users. TM supports movement between different locations with the same mobile terminal (MT). In TM management, an MT updates its location when it changes location area (LA) and an incoming call is delivered to the MT by paging all cells within a registered LA. PM supports user mobility between different terminals by using personal identifier (PID). In this paper, we propose an efficient paging scheme for TM in interworked fixed and mobile networks, by using registration information for PM management. In the proposed paging scheme, paging is firstly performed only to the cells containing terminals with which a user is registered for PM, instead of all cells within a registered LA. If the called user is not found in the first paging step, remaining cells within the registered LA are paged. Performance comparison results show that the proposed scheme can achieve significant signaling load reduction at radio interface, and save scarce radio resources.
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Reset (finance)
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Mobility management in Long Term Evolution (LTE) is different from that in the third generation mobile telecom networks. In LTE, the Mobility Management Entity (MME) is responsible for the mobility management function. The MME is connected to a large number of evolved Node Bs (cells) that are grouped into the Tracking Areas (TAs). The TAs are further grouped into TA Lists (TALs). When a User Equipment (UE) moves out of the current TAL, it reports its new location to the MME. If the LTE network attempts to connect to the UE, the MME asks the cells in the TAL to page the UE. In LTE paging, the MME may sequentially page a cell, the TA of the cell, and/or the TAL of the cell. Recent trends of research works related to location management in LTE network has been surveyed and three aspects in this regard - reducing signaling congestion, design of paging areas and intelligent mobility management has been outlined in this paper.
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LTE Advanced
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An efficient mobility management for mobile stations plays an important role in mobile communication networks. Two basic operations of mobility management are location registration and paging. A zone-based registration (ZBR) is implemented in most of the mobile communication networks and we consider the mobility management scheme that combines a zone-based registration and a selective paging (SP). We propose a new analytical model that can reflect the characteristics of the ZBR smoothly where location areas of the ZBR are set up so that regions such as roads, bridges, rivers and mountains, where there is relatively little traffic, will constitute their boundaries. We adopt a revised 2-dimensional random walk mobility model to consider such characteristics. In addition, we propose a more efficient division scheme of location area for 2-step selective paging. We evaluate the performance of the mobility management scheme using our mobility model to determine the optimal size of a location area that will result in the minimum signaling traffic on radio channels. Numerical results are provided to demonstrate that our mobility model is useful to evaluate the ZBR more exactly. The results of this study can be used effectively in analyzing and comparing the performances of various mobility management schemes.
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This chapter discusses the mobility management procedures that the network uses to keep track of the mobile's location. It begins by covering the procedures that switch a mobile between these states in response to changes in the user's activity, namely S1 release, paging and service requests, and continue by describing the mobility management procedures themselves. The chapter defines the mobility management procedures that the mobile should follow cell reselection in radio resource control (RRC)_IDLE, while TS 23.401. It describes the signalling procedures in RRC_CONNECTED and the procedures that switch the mobile between states. The chapter shows the measurements that the mobile has to make in both RRC states and the corresponding performance requirements.
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Idle
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Mobility management in Long Term Evolution (LTE) is different from that in the third generation mobile telecom networks. In LTE, the Mobility Management Entity (MME) is responsible for the mobility management function. The MME is connected to a large number of evolved Node Bs (cells) that are grouped into the Tracking Areas (TAs). The TAs are further grouped into TA Lists (TALs). When a User Equipment (UE) moves out of the current TAL, it reports its new location to the MME. If the LTE network attempts to connect to the UE, the MME asks the cells in the TAL to page the UE. In LTE paging, the MME may sequentially page a cell, the TA of the cell, and/or the TAL of the cell. This paper investigates the performance of LTE paging, and provides the guidelines for the best paging sequence of cells.
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LTE Advanced
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