Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.
- Solutionselected by danilue
With the settings:
VoLTE call:=Off
Network mode:=3G only
Mobile Data/Mobile Internet:=Off
The mobile phone with Android operating system exclusively uses the 3G/UMTS mobile network. If “Mobile data” is switched off, the mobile phone switches to “pure” UMTS mode (without HSPA/HSPA+/HSDPA/HSUPA). In “pure” UMTS mode, the Android mobile phone shows the “3G” mobile network logo or no mobile network logo at all in the status bar at the top.
The “pure” UMTS mode is the only network mode that can be used today where the mobile phone uses “soft handover”. 2G/GSM, 4G/LTE and 5G only support “Hard Handover”. If the mobile network logo “H” or “H+” appears at the top of the status bar, HSPA/HSPA+/HSDPA/HSUPA is used, which only enables “Hard Handover”!
https://de.wikipedia.org/wiki/Handover
“Soft Handover” enables a much more stable change of the mobile phone antenna during an ongoing telephone call than “Hard Handover”. This is particularly beneficial in fast-moving motor vehicles and railway carriages.
The car is a Farady cage. Making phone calls in a Farady cage is a very bad idea! The cell phone signal received in the car is 1000x weaker than outside. The window panes, which are coated with a very thin layer of metal (heat protection glazing) and the metal car shell, shield the mobile phone signal very well. That’s why you should only use an external antenna to make phone calls in your car. The same applies to rail cars without in-train repeaters.
https://community.swisscom.ch/t5/Mobile/Abbruch-des-telefonat/m-p/636411
https://de.wikipedia.org/wiki/Intrain-Repeater
The cell reception problem can be isolated as follows:
1.) Set the mobile phone to “pure” UMTS mode as described above.
2.) Sit in the passenger seat and dial the telephone number *#0011# on the Samsung mobile phone before the car journey described above (the mobile phone’s internal network monitor is started).
3.) Observe the indication “PSC” while driving. The number “PSC” corresponds to the cell phone antenna currently in use.
While driving, observe the indication “RSCP” (RSCP_CPICH). “RSCP” corresponds to the signal strength of the received mobile signal. The RSCP value is also displayed graphically with a strong delay with the well-known “mobile signal bars” in the status line at the top. For a stable telephone conversation with good voice quality, experience has shown that the RSCP value should be in the range of -30 to -90. The closer the RSCP value is to 0, the stronger the cell phone signal received by the cell phone antenna. RSCP values of -90 to -140 indicate a mobile signal that is too weak. The value -255 means that the cell phone is not receiving a cell phone signal at all.
4.) Use the Bakom radio transmitter card to determine which mobile phone antenna corresponds to which PSC number.
https://map.geo.admin.ch/?topic=funksender
[https://community.swisscom.ch/t5/Mobile/Mit-welcher-Handy-Antenne-bin-ich-verbunden/m-p/646485](https://community.swisscom.ch/t5/Mobile/Mit- which-cell-phone-antenna-am-I-connected/m-p/646485)
5.) After troubleshooting, the “pure” 3G/UMTS mode should be switched off again for health reasons (radiation protection) by undoing all the settings listed above!
To find the cell phone antenna currently in use, you should also consult the information below:
[https://community.swisscom.ch/t5/Mobile/Mit-welcher-Handy-Antenne-bin-ich-verbunden/td-p/646485](https://community.swisscom.ch/t5/Mobile/ Which cell phone antenna am I connected to/td-p/646485)
be taken into account.
To measure the signal strength and signal quality of the 4G/LTE and 5G cellular signal, see:
[https://community.swisscom.ch/t5/Mobile/4G-VoLTE-telefonieren-mit-externer-antenna-oder-analogem-telefon/m-p/638463#M8231] (https://community.swisscom.ch/t5/Mobile/4G-VoLTE-telefonieren-mit-externer-Antenne-oder-analogem-telefon/m-p/638463#M8231)
Thank you @GrandDixence for the detailed description of the measurement method and everyone else who advised me.
I tried it this way today and on PSC 287 just before the top of the pass I constantly ended up with values of -102 to -122. It then changed to PSC 152, briefly to -88 then -111 again down to the village - there PSC 52? (not sure anymore) at around -95 and then again at all around -80 until the end of Densbüren.
I hope Swisscom reads along and improves the channels…
Nope, the poor, constantly stressed Swisscom employees have no time for network optimization. Ultimately, 700 jobs have to be cut within Swisscom and what suffers from the job cuts is the customer and the network quality:
http://www.20min.ch/finance/news/story/Swisscom–Swisscom-20186931
Not necessarily, if you were to fire the 5-10% of salespeople who cause 90 percent of all complaints and time-consuming follow-up measures, you could save money not only in sales but also in the downstream areas and staff, and of course at the same time also save something for that slightly battered image do.
The invention of more and more “pseudo-new pure marketing products” is not necessarily always profitable.
I would assume that there are a few profit-increasing levers that do not directly have a negative impact on the network or service quality…
Hobby-Nerd ohne wirtschaftliche Abhängigkeiten zur Swisscom
@danilue wrote:
I tried it this way today and on PSC 287 just before the top of the pass I constantly ended up with values of -102 to -122. It then changed to PSC 152, briefly to -88 then -111 again down to the village - there PSC 52? (not sure anymore) at around -95 and then again at all around -80 until the end of Densbüren.
RSCP is a power level with the reference value 1 mW (milliwatt) => Lp (dBm) in logarithmic form:
[https://de.wikipedia.org/wiki/Performance Level](https://de.wikipedia.org/wiki/Performance Level)
As already stated, the cell phone signal received by the cell phone antenna in the car is around 1000x weaker than outside (outdoor reception). If I convert the values measured in the car to the outdoor reception (1000x stronger => 30 dBm more) this results in:
« I constantly landed on values from -72 to -92 on PSC 287 just before the top of the pass. It then changed to PSC 152, briefly to -58 then again -81 down to the village - there PSC 52? (not sure anymore) at approx. -65 and then again at everyone around -50 to the end of Densbüren. »
Therefore, the outdoor reception or outdoor antenna reception on this route is good (just before the top of the pass => -92) to very good (> -90).
Wow, those are good values - then I’ll probably have to hold my cell phone out of the car window to still be able to talk hands-free via Bluetooth - but at least a target size that it has to be achieved!
Thank you for sharing the experience.
So that there are no false hopes: The RSCP peak values I measured for the received UMTS/3G mobile signal are in the range of -43 to -47 dBm. These RSCP values are probably very close to the radiation protection limit! These RSCP peak values were measured on the platform of the Zurich HB and Bern train stations.
Meanwhile, cell phone transparent car windows are available with a laser-treated metal layer for thermal protection.
[https://www.toponline.ch/news/schweiz/detail/news/modernisierung-bei-der-sbb-mobilfunkdurchlaessige-fensterscheibe-und-neue-sitz-00104487/] (https://www.toponline.ch/news/schweiz/detail/news/modernisierung-bei-der-sbb-mobilfunkdurchlaessige-fensterscheibe-und-neue-sitz-00104487/)
When using car windows that are transparent to mobile radio, there is no need to use internal repeaters for train cars and external antennas for road vehicles.
Note/clarification on the minimum required signal strength:
According to the 3GPP specification TS 125 101, version V14.0.0, chapter 7.3.1, the minimum required receiver sensitivity of a UMTS mobile phone for UMTS900 (Band 8 with a maximum bit error rate of 0.1% is defined at -114 dBm (RSCP).
https://www.etsi.org/deliver/etsi_ts/125100_125199/125101/14.00.00_60/ts_125101v140000p.pd f
A maximum bit error rate of 0.1% is required for good voice quality. With a minimum signal strength of -90 dBm, you already have a connection reserve of 24 dB (factor 251x) to create a stable mobile phone connection for voice telephony. For further technical details see:
[https://de.wikipedia.org/wiki/Reichbreite\_(Radio Technology)](https://de.wikipedia.org/wiki/Reichweit_(Radio Technology))
With UMTS/3G, for a stable mobile connection for voice telephony, in addition to the signal strength (RSCP) of the received mobile signal, the Ec/Io of the received mobile signal must also be taken into account. The measured Ec/Io value must be in the range -3 to -11 dB. For technical details about Ec/Io see:
[https://www.telecomhall.net/t/what-is-ec-io-and-eb-no/6271](https://www.telecomhall.net/t/what-is-ec-io- and-eb-no/6271)
An Ec/Io > -9 dB is required for reliable registration/log-in in the 3G/UMTS mobile network:
https://www.ecodocdb.dk/download/2c0760ef-7abd/ECCREP103.PDF
UMTS is a single-frequency network. All UMTS cell phone antennas from a cell phone provider send out a 5 MHz wide UMTS cell phone signal on the same frequency. The cell phone can filter out the received UMTS cell phone signal from the nearest cell phone antenna using coding (CDM).
At elevated locations, the cell phone can receive the UMTS cell phone signal from numerous cell phone antennas. If the signal strength of the overall signal (RSSI) of all received mobile phone signals from all mobile phone antennas is significantly greater than the signal strength of the strongest received individual signal (RSCP) from a single mobile phone antenna, the mobile phone can no longer filter out the individual signal from the overall signal.
If the cell phone can no longer filter out the individual signal from the overall signal (Ec/Io < −11 dB), voice telephony over the UMTS cell phone network can be unreliable. This situation can occur especially at elevated locations on the Jura and foothills of the Alps directly adjacent to the Swiss plateau, where, thanks to line of sight, the mobile phone signal can be received from numerous mobile phone antennas in the Swiss plateau.
For alternative means of communication for making an emergency call in locations affected by poor “Ec/Io” values, see:
[https://de.wikipedia.org/wiki/Notruf#Notruf\_%C3%BCber\_Notrufkanal\_(161,300\_MHz)](https://de.wikipedia.org/wiki/Notruf#Notruf_%C3 %BCber_Emergency Channel_(161,300_MHz))
