T:radio power decreasing overnight

  • I had already noticed that I was missing emails, but I couldn't find out why. Thats why I send an SMS to the providers email gateway in case I have not successfully send my email. The SMS contains the GPRS status, CGATT status and the result of AT#MONI. I sent the email about every half hour over the last night. Well look for yourself.


    (newest message from 2:00)
    GPRS: 1 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-99dbm TA:1
    GPRS: 1 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-99dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-100dbm TA:0
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:1 LAC:0325 Id:1027 ARFCN:826 PWR:-105dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:1 LAC:0325 Id:1027 ARFCN:826 PWR:-106dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-104dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-105dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-104dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-104dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-101dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-104dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-104dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-103dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-103dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-101dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-101dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-103dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-100dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-101dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-103dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-103dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-106dbm TA:0
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:2 LAC:0325 Id:1027 ARFCN:826 PWR:-107dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-104dbm TA:0
    GPRS: 0 CGATT: 0 (e-plus) T-Mobile D BSIC:35 RxQual:0 LAC:690B Id:72F6 ARFCN:42 PWR:-53dbm TA:1
    GPRS: 0 CGATT: 0 (e-plus) E-Plus BSIC:33 RxQual:1 LAC:0325 Id:1027 ARFCN:826 PWR:-105dbm TA:1
    GPRS: 0 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-100dbm TA:1
    GPRS: 0 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-97dbm TA:1
    GPRS: 0 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-95dbm TA:0
    GPRS: 0 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-96dbm TA:1
    GPRS: 1 CGATT: 1 (e-plus) E-Plus BSIC:33 RxQual:0 LAC:0325 Id:1027 ARFCN:826 PWR:-95dbm TA:1
    (oldest message from 18:00)


    (1) the rradio power is decreasing overnight. Has anybody an explanation for this? Typical power during the day would be -75dbm. Could it be the the provider is reducing the power e.g. to save energy? It's very hot these days the transmitter might have heated up during the day and cooled down in the evening this would fit pretty good to the time and the gradually de- and increasing power.


    (2) at very low radio power (< -105dbm) the quality decreases too.


    (3) loosing the ability to connect to GPRS and I'm trying hard to connect with long timeouts and several retries.


    (4) same with CGATT.


    (5) At one occaison it even cannot recognise its own netwoork! How can that be, because it was still able to send an SMS?


    You see me puzzled: what can I do?



    Q: Type of module? A:ter110
    Q: Firmware version? A: 7.3.5

  • Hi Uli, please be so kind and post the answer of E-Plus here. Please note that GSM operators are changing the power of the base station sometimes. By reducing the power the force a hand over to other GSM cells. BTW TA:0 or TA:1 tells you the distance to base station. If you go on the street, then you can "see" the GSM antenna of the base station. TA means Timing Advance
    With AT#MONI you can read the number of neighbour cells. How many neighbour cells you have? Please tell us the result with T_mobile SIM card as well.


    Timing advance
    >>> snip <<<

    Quote

    We determined earlier that for each propagation delay of 3.69µs the TA is incremented by one. We just learned that a propagation delay of 3.69µs equals a one-way distance of 553.5 meters. So, we see that each TA is equal to a distance of 553.5 meters from the tower. Starting from the BTS (0 meters) a new TA will start every 553.5m.


    >>> snip <<<
    BTW, used Time Advance in year 2000 to track all mobile ticket sales men at Word Trade Show EXPO Hannover. The sales men of the gondola lift at the exhibition had a lot of money in their pockets.
    http://en.wikipedia.org/wiki/Gondola_lift

  • Hi Uli, I agree with the Harald's feedback.


    Furthermore, another possible cause (but I'm oriented to the power changing by the net too) :
    the strength of the serving cell is however low.
    it could be also some effect due to adjacent channel interference.
    In some conditions it's sufficient that sometime one or more cells e.g at -80 dBm transmits on an adjacent channel to the serving cell channel at -100dBm and this could cause the difference of the power measured