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Consistency preservation techniques for Location Register System in Mobile Networks

  • Received : 2020.04.23
  • Accepted : 2020.05.04
  • Published : 2020.05.31

Abstract

A database called Home Location Register(HLR) plays a major role in location management in mobile cellular networks. The objectives of this paper are to identify the problems of the current HLR system through rigorous analysis, to suggest solutions to them. The current HLR backup method is a process of simply writing the changed memory SLD block to disk, which has a problem in maintaining database consistency. Since information change and backup are performed separately by separate processes, there is a risk of information inconsistency when an error restart occurs. To solve this problem, a transaction concept was introduced for subscriber-related operation functions and a recovery method through logging and checkpointing was introduced. The subscriber related functions of tasks terminated normally by the suggested process are recovered with consistency even after system restarts. Performance is also not affected seriously because disk tasks for log occur with only subscriber related functions.

Keywords

References

  1. Michael Freitag, M.Sc., Prof. Alfons Kemper, Ph.D. Garching Michael Freitag, M.Sc., Prof. Alfons Kemper, Ph.D. Garching, "Seminar: Implementation Techniques for Main Memory Database Systems", June, 2018.
  2. F. Faerber, A. Kemper, P. A Larson, J. Levandoski, T. Neumann, and A. Pavlo. Main Memory Database Systems. Foundations and Trends in Databases, vol. 8, no. 1-2, pp. 1-130, 2016. https://doi.org/10.1561/1900000058
  3. M. Min, "Experiments of Search Query Performance for SQL-Based Open Source Databases", International Journal of Internet, Broadcasting and Communication, Vol. 10, No.2, pp. 31-32, 2018. DOI: https://doi.org/10.7236/IJIBC.2018.10.2.6
  4. R. Elmasri, and S. B. Navathe, Fundamentals of Database Systems, 7th Edition, Pearson, 2016.
  5. Sung-Moon Michael Yang, Modern Digital Radio Communication Signals and Systems, Springer, 2019. DOI: https://doi.org/10.1007/978-3-319-71568-1
  6. 3GPP, Technical Specification Group Core Network and Terminals, TS 29.011, 2014.09.
  7. Y. Xiao, Y. Pan, and J. Li, "Design and Analysis of Location Management for 3G Cellular Networks," IEEE Transactions on Parallel and Distributed Systems, Vol. 15, No. 4, pp. 339-349, April 2004. https://doi.org/10.1109/TPDS.2004.1271183
  8. TTA, MSC/VLR-HLR/AC MAP, 1997.7,
  9. TTA, ANSI-41/WIN - International implementation of Wireless Telecommunications Systems Compliant With ANSI/TIA/EIA-41, 2002.10.28
  10. TIA/EIA, IS-41(A), Initial Version. Jan. 1991.