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Predictive Location Management Strategy Using Two Directional Consecutive LAs a Cellular Network
장인갑(I.K. Chang),홍정식(J.S. Hong),김지표(J.P. Kim),이창훈(C. H. Lie) 한국경영과학회 2008 韓國經營科學會誌 Vol.33 No.3
In this paper, we have presented a dynamic, predictive location update scheme that takes into account each user's mobility patterns, A user's past movement history is used to create two-dimensional transition probability matrix which makes use of two directional consecutive location areas. A mobile terminal utilizes the transition probability to develop a predictive path which consists of several predictive nodes and then the location update is saved as long as a mobile user follows the predictive path. Using continuous-time Markov chain, cost functions of location update and paging are derived and it is shown that the number of predictive nodes can be determined optimally. To evaluate the proposed scheme, simulations are designed and the numerical analysis is carried out. The numerical analysis features user's mobility patterns and regularity, call arrival rates, and cost ratio of location update to paging, Results show that the proposed scheme gives lower total location management cost. compared to the other location update schemes.
이동 통신망에 있어서 새로운 셀 체류시간 모형화에 따른 최적 이동성 관리
홍정식,장인갑,이창훈 한국경영과학회 2002 한국경영과학회지 Vol.27 No.3
This study investigates two basic operations of mobility management of PCNs (Personal Communication Networks). i.e., the location update and the paging of the mobile terminal. From the realistic consideration that a user either moves through several cells consecutively or stays in a cell with long time, we model the mobility pattern by introducing two types of CRT (Cell Residence Time). Mobility patterns of the mobile terminal are classified into various ways by using the ratios of two types of CRT. Cost analysis is performed for distance-based and movement-based location update schemes combined with blanket polling paging and selective paging scheme. It is demonstrated that in a certain condition of mobility pattern and call arrival pattern, 2-state CRT model produces different optimal threshold and so, is more effective than IID (Independently-Identically-Distributed) CRT model. An analytical model for the new CRT model is compact and easily extendable to the other location update schemes.
이동 통신망에서 영역 분할 방식을 이용한 페이지 비용 감소 방안
박노열,장인갑,홍정완,이창훈 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.1(1)
In personal communication systems, location management of mobile terminals is required to connect incoming calls to the mobile terminals. Investigation of effective location update and paging strategies is important to reduce the cost of location management. In this study, we propose a paging strategy considering the mobile terminals' residence patterns. The first paging area is introduced, which is characterized by the set of cells in the location area where mobile terminals usually stay for a significant period of time. We propose the decision criterion of the first paging area by comparing the cost against zone-based strategy. For an incoming call, we perform the sequential paging by the order of the first paging area and the rest of cells in the location area called by the second paging area. Thus the paging cost is greatly reduced, especially when the called mobile terminal is located in the first paging area. The proposed strategy is expected to be more effective than existing strategy using anchor cell in the location area because it reflects various residence patterns of mobile terminals.