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Timing and synchronization in mobile telecommunication networks

Timing and synchronization in mobile telecommunication networks,10.1109/FCS.2011.5977834,Rimantas Miskinis,Dmitrij Smirnov,Emilis Urba,Bronislovas Dzi

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Timing and synchronization in mobile telecommunication networks  
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Recent developments in mobile telecommunication networks offer a possibility for synchronization of mobile equipment. The possibility is explored here. To this end, a network operator is synchronized to the Lithuanian national time and frequency standard over internet via NTP (Network Time Protocol). A mobile testing system (MTS) created is synchronized to the operator's network via a radio modem operating in one of the several different modes. The time scale of the MTS synchronized over the mobile telecommunication network is compared to that of the national standard to evaluate the synchronization accuracy and to find out that the most suitable operating mode for the modem is CSD (Circuit Switched Data), which is likely due to its dedicated and symmetrical nature. I. INTRODUCTION Implementation of new services and technologies in mobile telecommunication networks requires more precise timing and synchronization of the network systems as well as user's equipment. Correct timing may be very important for different M2M (Machine To Machine) applications, such as metering (measuring parameters of telecommunication channels), fleet management, mobile commerce, and public key infrastructure (PKI) applications, such as e-health, e-government, e- signature, etc. Some results on time synchronization over the second generation network GSM (Global Standard for Mobile Communications), via the GPRS (General Packet Radio Services) and EDGE (Enhanced Data rates for GSM) channels, are presented in the works (1, 2). However, the two aspects are not considered - timing over dedicated low bit second generation networks via the CSD (Circuit Switched Data) channel and timing over the third generation network UMTS (Universal Mobile Telecommunications System) via the HSDPA (High-Speed Downlink Packet Access) channel. Networks of the third generation are very popular now. Nevertheless, channels of the third generation networks exhibit propagation characteristics very different from those of the second generation networks, such as GSM. The purpose of our work is a comparative testing of timing and synchronization characteristics of mobile GSM network via the CSD, GPRS, EDGE channels as well as over the UMTS (Release 99) network via the HSDPA channel. Propagation characteristics of different channels have been evaluated by using standard telecommunications testing equipment. Timing characteristics have been evaluated by using the data of NTP communications created during the synchronization of the mobile testing system (MTS) to the NTP servers of the Lithuanian National Time and Frequency Standard Laboratory.
Conference: IEEE International Frequency Control Symposium - FCS , pp. 1-5, 2011
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