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WIRELESS NETWORKS Elektronik International 2020 17 ➔ Acurrent problem of all LPWAN technologies is that although they may enable different new applications in different vertical industries the integration effort is still comparatively large and cannot be produced by many companies for lack of means or competence To drop this initial hurdle the TC is working intensively on specifying an application layer that cuts the expense of integration and promotes interoperability ➔ Afurther activity focuses on use of Mioty in different regions Currently the standard only refers to use in the frequency bands 868 MHz for the European market and 915 MHz for the US and similar markets To enable use in other countries especially Asian new frequency bands need to be set down and specified Hardware platform Terminals are of special interest for device developers As mentioned previously the overall architecture of a Mioty network is structured so that many modern wireless transceivers comply with the requirements That means it is adequate to send data through the end node uplink if the wireless transceiver IC supports G MSK modulation something FSK wireless transceiver ICs can typically always do Plus it should be possible to deactivate preamble and sync word Examples of suitable wireless transceiver ICs are the CC1310 from Texas Instruments 2 Fig 3 the Si4463 from Silicon Labs 3 and the SX1276 from Semtech 4 Receiving data over the end node downlink needs access to an IQ interface to search for the pilot bits in the bit stream For the base station gateway there is a very flexible and highperformance platform based on an Intel i3 microprocessor Further more costattractive platforms for base stations are upcoming Fig 4 Software implementation For transceiver ICs developers can as of recently use ready software offered in various license models These range from uncosted evaluation versions for test purposes through standard installations with singlelicense fees to customized packages for large quantities The architecture of the software for the Mioty protocol Fig 5 is very modular in structure and continuously matched to further hardware platforms Noticeable in this case is that the whole hardware abstraction is separate for fast and efficient matching to new transceiver ICs HS References 1 ETSI TS 103 357 Short Range Devices Low Throughput Networks LTN Protocols for Radio Interface A Technical specification V1 1 1 2018 www etsi org deliver etsi_ts 103300_103399 103357 01 01 01_60 ts_103357v010101p pdf 2 CC1310 Simple Link Ultra-LowPower Sub-1 GHz Wireless MCU Texas Instruments data sheet July 2018 www ti com lit ds symlink cc1310 pdf?ts=1590482726745 3 Si4464 63 61 60 High-Performance Low-Current Transceiver Silicon Labs data sheet 2016 www silabs com documents public datasheets Si4464-63-61-60 pdf 4 SX1276 77 78 79 137 MHz to 1020 MHz Low Power Long Range Transceiver Semtech data sheet January 2019 https semtech my salesforce com sfc p #E0000000JelG a 2R0000001OKs Bs97dmPXeatnbdoJNVMIDaKDlQz8q1N_ gxDcgqi7g2o 5 Bernhard J Dünkler R Kneissl J Otte L Funknetzwerke Mioty die Revolution des IoT Elektronik 2019 no 7 pp 2630 Fig 5 The software stack for Mioty terminals was implemented with a separate hardware abstraction layer HAL for fast and efficient matching to new transceiver ICs figure Stackforce Prof Dr Axel Sikora is scientific director of the Institute for Reliable Embedded Systems and Communication Electronics ivESK at Offenburg University head of the Software Solutions department and associate head of the Hahn-Schickard Society for Applied Research in Villingen-Schwenningen He is also a founder and partner of Stackforce one of the founding members of the Mioty Alliance active as a stack provider and engineering service axel sikora@hsoffenburg de