Hello,
We are doing some network quality tests on LTE-M with PSM off and notice loss on UDP between 0% to sometimes 15% on simple udp messages sent every 10 seconds from the server to a client running on thingy91.
We noticed that when higher loss occurs we get more events of LTE_LC_EVT_CELL_UPDATE. The cell keeps changing between few cells in the area, their description according to cellmapper.net is attached.
Questions:
1. Is it possible that cell changing can induce loss on packets coming from server to client?
Something like the packet is kept on the cell until the DRX passes and device checks every 1.28 s, but if device changes cell then packet is lost?
2. Is there any way to make the device stop searching?
Thanks
eNB ID 10253 - LTE MCC / MNC / Region 226 / 10 / 10103 Bands 3, 7 First Seen Mon, Mar 25, 2019 Last Seen Thu, Feb 3, 2022 5G ENDC Available Yes Approximate Address Hotel Ibis Styles, Strada Căpitan Aviator Alexandru Șerbănescu, Aviației, Sector 1, Bucharest, 014196, Romania Cell Identifier 2624769 System Subtype LTE PCI 414 (138/0) Bandwidth 20 MHz EARFCN 1600 Maximum Signal (RSRP) -77 dBm Direction E (103°) First Seen Wed, Aug 21, 2019 Last Seen Sat, Jan 15, 2022 5G ENDC Available Yes Bandwidth* 20 MHz Uplink Frequency 1750 MHz Downlink Frequency 1845 MHz Frequency Band DCS (B3 FDD) ================================================================================== eNB ID 11251 - LTE MCC / MNC / Region 226 / 10 / 10103 Bands 3, 7 First Seen Tue, Jul 28, 2015 Last Seen Fri, Feb 18, 2022 5G ENDC Available Yes Approximate Address 7, Strada Ocheanului, Aviației, Sector 1, Bucharest, 014364, Romania Cell 2 Cell Identifier 2880258 System Subtype LTE-A PCI 169 (56/1) Bandwidth 20 MHz EARFCN 1600 Maximum Signal (RSRP) -66 dBm Direction NW (309°) Max / Avg DL Speed 16 Mbps / 16 Mbps First Seen Tue, Jul 28, 2015 Last Seen Mon, Oct 4, 2021 5G ENDC Available Yes Bandwidth* 20 MHz Uplink Frequency 1750 MHz Downlink Frequency 1845 MHz Frequency Band DCS (B3 FDD) ================================================================================== eNB ID 15481 - LTE MCC / MNC / Region 226 / 10 / 10118 Bands 3, 7 First Seen Mon, Jul 20, 2015 Last Seen Fri, Feb 11, 2022 5G ENDC Available Yes Approximate Address Strada Câmpul Pipera, Henri Coandă, Voluntari, Ilfov, 020112, Romania Cell 2 Cell Identifier 3963138 System Subtype LTE-A PCI 166 (55/1) Bandwidth 20 MHz EARFCN 1600 Maximum Signal (RSRP) -69 dBm Direction NE (55°) First Seen Tue, Jul 28, 2015 Last Seen Sat, Sep 26, 2020 Bandwidth* 20 MHz Uplink Frequency 1750 MHz Downlink Frequency 1845 MHz Frequency Band DCS (B3 FDD) ================================================================================== eNB ID 14001 - LTE MCC / MNC / Region 226 / 10 / 10103 Bands 3, 7 First Seen Tue, Jul 28, 2015 Last Seen Fri, Feb 25, 2022 5G ENDC Available Yes Approximate Address Nord City Tower, 1/VII, Bulevardul Pipera, Voluntari, Ilfov, 077190, Romania Cell 3 Cell Identifier 3584259 System Subtype LTE PCI 197 (65/2) Bandwidth 20 MHz EARFCN 1600 Maximum Signal (RSRP) -65 dBm Direction NE (50°) First Seen Tue, Jul 28, 2015 Last Seen Fri, Feb 18, 2022 5G ENDC Available Yes Bandwidth* 20 MHz Uplink Frequency 1750 MHz Downlink Frequency 1845 MHz Frequency Band DCS (B3 FDD)
