Reducing paging cost of tracking area list-based mobility management in LTE network
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Reducing paging cost of tracking area list-based mobility management in LTE network Jihee Jung1 · Jang Hyun Baek1
© Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract In long-term evolution (LTE) network, service area is composed of tracking areas (TAs) lists (TALs) and a TAL includes a few neighbor TAs. In this paper, we consider paging schemes for TAL-based mobility management in LTE network. In TAL-based mobility management, whenever a user equipment (UE) enters a new TAL, it updates its location so that the current TA becomes the center TA of new TAL. We develop a mathematical model to analyze signaling cost of previous paging schemes for TAL-based mobility management. We then suggest new paging schemes to reduce paging cost. First, in order to mathematically analyze the performance of previous paging schemes, we use a Markov chain model based on 2-D random walk model. In our 2-D random walk model, unlike prior studies, the UE can move to one of four neighbor cells with equal probability to be more realistic. We also suggest new paging schemes to reduce the paging cost of previous paging schemes. With our analytical models, our paging schemes are found to be better than previous paging schemes in most cases. Various numerical results show that the proposed schemes are much more effective than previous paging schemes. These results suggest that the proposed schemes can be used effectively in the design and evaluation of mobility management in LTE network. Keywords TAL-based mobility management · Paging · Location registration · Markov chain · 2-D random walk model
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Jang Hyun Baek [email protected] Department of Industrial and Information Systems Engineering, Chonbuk National University, Jeonju 54896, Korea
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J. Jung, J. H. Baek
1 Introduction It is important to know the location of user equipment (UE) so that incoming calls can be delivered to UEs properly [2–7]. The network uses mobility management mechanism to keep location of the UE. Mobility management consists of two essential operations: location registration and paging. Location registration is the process through which the UE dynamically updates its location in network databases. Paging is a process through which the network broadcasts a paging message to all cells of current location area and pinpoints the cell where the UE currently resides when an incoming call arrives so that the incoming call can be delivered to the UE [9–15, 17]. Figure 1 shows a simple TAL structure in LTE network. In LTE network, mobility management entity (MME) is responsible for tracking locations of UEs. The MME is connected to a group of evolved Node Bs (eNBs). The radio coverage of eNB is called a cell. These cells are grouped into non-overlapped tracking areas (TAs) [1]. Some TAs are then grouped into a TA list (TAL). As shown in Fig. 1, TA 3 is composed of cells 5 and 6, while TA 3 is included in TAL 1. Every eNB periodically broadcasts its TA identity (TAI). The UE receives this TAI and compares with its stored TAL. If the received TAI
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