{"title":"Time Synchronization between the eNBs in E-UTRAN under the Asymmetric IP Network","authors":"M. Kollar, A. Zieba","volume":148,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":230,"pagesEnd":235,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10010255","abstract":"
In this paper, we present a method for a time synchronization between the two eNodeBs (eNBs) in E-UTRAN (Evolved Universal Terrestrial Radio Access) network. The two eNBs are cooperating in so-called inter eNB CA (Carrier Aggregation) case and connected via asymmetrical IP network. We solve the problem by using broadcasting signals generated in E-UTRAN as synchronization signals. The results show that the time synchronization with the proposed method is possible with the error significantly less than 1 ms which is sufficient considering the time transmission interval is 1 ms in E-UTRAN. This makes this method (with low complexity) more suitable than Network Time Protocol (NTP) in the mobile applications with generated broadcasting signals where time synchronization in asymmetrical network is required.<\/p>\r\n","references":"[1]\tT. Gotoh, K. Imamura and A. Kaneko, \"Improvement of NTP time offset under the asymmetric network with double packets method,\" Conference Digest Conference on Precision Electromagnetic Measurements, Ottawa, Ontario, Canada, 2002, pp. 448-449.\r\n[2]\tD. L. Mills, \u201cComputer Network Time Synchronization: The Network Time Protocol\u201d, CRC Press, 2006.\t\r\n[3]\tJ. C. Eidson, \u201eCorrecting time synchronization inaccuracy caused by asymmetric delay on a communication link\u201d, Patent US7602873, 2009.\r\n[4]\tJ. C. Eidson, \u201eCorrecting time synchronization inaccuracy caused by asymmetric delay on a communication link\u201d, Patent JP4922750, 2012.\r\n[5]\t\u201cX2 general aspects and principles\u201d, 3GPP TS 36.420 V9.0.0, 2009. \r\n[6]\tM. Bhardwaj, L. Paruchuri and S. Shandilya, \"Network monitoring in LTE small cell environment,\" 2015 International Conference on Advanced Computing and Communication Systems, Coimbatore, 2015, pp. 1-5.\r\n[7]\tR. Prasad, C. Dovrolis, M. Murray and K. Claffy, \"Bandwidth estimation: metrics, measurement techniques, and tools,\" in IEEE Network, vol. 17, no. 6, pp. 27-35, Nov.-Dec. 2003.\r\n[8]\tE. Dahlman, S. Parkvall and J. Skold \u201c4G: LTE\/LTE-Advanced for Mobile Broadband (Second Edition)\u201d, Academic Press, 2013, p.544.\r\n[9]\t\u201cEvolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification\u201d, 3GPP TS 36.331 V14.5.1, 2018.\r\n[10]\t\u201cEvolved Universal Terrestrial Radio Access (E-UTRA); Layer 2 - Measurements\u201d, 3GPP TS 36.314 V14.0.0, 2017.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 148, 2019"}