Cell ID extension in femtocell environments |
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| Authors: | Sungoh Kwon Neung-Hyung Lee |
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| Affiliation: | 1. School of Electrical Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. Samsung Electronics Co. LTD., Suwon, Gyeonggi 443-742, Republic of Korea;1. School of Computer Science and Engineering, Southeast University, Nanjing 211189, PR China;2. Department of Computer and Information Sciences, Towson University, Towson, MD 21252, United States;3. Department of Computer Science, University of Massachusetts Lowell, Lowell, MA 01854, United States;4. Department of Computer Science, City University of Hong Kong, Hong Kong Special Administrative Region, PR China;5. Rector of University of Macau, Macau SAR, China;1. Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. Department of Manufacturing Engineering and Engineering Management, City University of Hong Kong, Hong Kong;3. School of Electronic and Electric Engineering, University of Shanghai Jiaotong, Shanghai, PR China;1. UPMC Sorbonne Universités, Paris, France;2. University of Thessaly & CERTH-ITI, Greece;1. College of Computer Science and Technology, Zhejiang University, Hangzhou, China;2. College of Electrical Engineering, Zhejiang University, Hangzhou, China;3. College of Computer Science, Hangzhou Dianzi University, Hangzhou, China;1. LIA, University of Avignon, 339, chemin des Meinajaries, Avignon, France;2. CREATE-NET Via alla Cascata 56/D, Povo, Trento, Italy;3. EECS Dept., UC Berkeley, CA 94720, United States |
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| Abstract: | In this paper, we solve a cell identification problem in a femtocell environment. Wireless communication standards specify physical cell identifiers (PCIs) for user entities (UEs) to discriminate data from different cells and for networks to identify cells. However, in the densely deployed area, the number of PCIs for femtocells may not be sufficient. The scarcity of PCIs results in identification ambiguity due to duplicated PCIs in a certain area, which may result in handover failure. Using time synchronization between femtocells and macro-cells, we propose a scheme to efficiently identify cells in a femtocell environment. The proposed scheme defines the virtual cell identifier (vID) of a femtocell as the system frame number offset of the femtocell with respect to a macro-cell and differentiates femtocells with combinations of vIDs and PCIs. Our scheme can increase the number of cell identifiers up to 1024 times using even coarse local time synchronization without changing the existing physical layer specification. The improvement in cell identification resolution reduces redundant message transactions, resulting in network performance enhancement. Since our scheme demands only local time synchronization between adjacent cells, it can be applied to asynchronous as well as synchronous wireless systems. We verify the proposed scheme via simulations in various environments. |
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