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Thread: LTE signal thresholds?

  1. #1
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    LTE signal thresholds?

    Does anyone know how Rogers configured their LTE signal thresholds? I notice that Rogers phones will switch bands VERY frequently even while the phone is in the same place. For example, at home, recently Iíve observed my wifeís Rogers phone switching from 1-2 bars B4 to 2 bars B2 to 3 bars B17, and then back down to 1 bar B4...itíll fluctuate like that several times in the span of even just 30 mins (sometimes less) all while the phone is just sitting on the kitchen table. By comparison, my Telus phone is locked down to B2 most of the time, and itíll hang onto that band for as long as it can (even when signal is extremely weak).

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    I notice the same thing on Rogers, on all my various Rogers devices the bars are all over the place. When I was with Bell it was consistent, the bars were always lets say 3 bars in a certain spot of my house. With Rogers sometimes my phone will have 4 bars, then a minute later it drops to 1 bar, etc. all in the same spot.

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    I don't know how they configure their thresholds but I have the same "issue" as you!

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    @toolcube: Your wifeís Rogers phone behaves like my TELUS iPhone SE when Iím in my girlfriendís basement. When Iím close to the window (like right now), I get two bars (out of four) of low B7 (UARFCN 2850). When I move about 10 steps away from the window facing the TELUS tower, another wall is in the way and I drop to one bar of low B7 and the dancing might begin. I can drop to two or three bars of B4. If the bars keep falling ó which rarely happens ó I am on two or three bars of B2.

    The drop to B2 in the basement seems related to the weather, when itís raining or snowing noticeably.

    Almost everywhere else, my TELUS iPhone SE locks on to high B7 (UARFCN 3350) if available, then low B7 (UARFCN 2850), then B4, then B2, then B5 (rare), and finally B17 (usually just in my library). Thatís what Iíve noticed.
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    LTE signal thresholds?

    Wow your Telus experience is completely different from mine. I almost never see low band LTE (B5, B13/17)...and in several places I drop from B2/4 to 3G before regaining LTE on B13/17. Iím almost always on B2. Iím using an iPhone 8 Plus but my experience was the same with my iPhone 6.

    I would still like to know the Rogers LTE threshold algorithm if anyone knows and wants to PM me. Thanks.

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    You can capture the messaging with Network Signal Guru on a rooted Android phone (Qualcomm chipset). Zivan and I can help you decode them if you need it.
    Want to learn more about how LTE works?
    https://productioncommunity.publicmo...ls/td-p/130581

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    Unfortunately I only have iPhone devices at my disposal.

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    I can only provide the info as if it were completely up to the phone once receiving this message, which it is not. Rogers uses RRC reconfig messages to push you to different bands of the networks choice, so this would ignore that fact.

    Keep in mind this would only apply to Vancouver (lower mainland), as there would be different blocks of spectrum assigned to them. Likewise, since they are using a mix of outgoing Huawei RAN, and Ericsson RAN, it will differ.

    Huawei SIB5

    Code:
    LTE RRC Signaling Messages
      Version : 20
      RRC Release Number : 14
      RRC Version Minor : 0
      RRC Version Major : 3
      RB ID : 0
      Physical Cell ID : 106
      E-ARFCN : 1025
      SFN : 0
      Channel : 2
      Bitmask of SIBS : 32
      Message Length : 69
      bcch-dl-sch
        message
          c1
            systemInformation
              criticalExtensions
                systemInformation-r8
                  sib-TypeAndInfo[0]
                    sib5
                      interFreqCarrierFreqList
                        InterFreqCarrierFreqList[0]
                          dl-CarrierFreq : 2050 (Band 4)
                          q-RxLevMin : -64
                          t-ReselectionEUTRA : 1
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 7
                          neighCellConfig : 40(2 bits)
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[1]
                          dl-CarrierFreq : 3050 (Band 7)
                          q-RxLevMin : -60 (-120 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 7
                          neighCellConfig : 40(2 bits)
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[2]
                          dl-CarrierFreq : 2426 (Band 5)
                          q-RxLevMin : -60 (-120 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 3
                          neighCellConfig : 40(2 bits)
                        InterFreqCarrierFreqList[3]
                          dl-CarrierFreq : 5047 (Band 12/17)
                          q-RxLevMin : -62 (-124 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw25
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 3
                          neighCellConfig : 40(2 bits)
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[4]
                          dl-CarrierFreq : 5765 (Band 12)
                          q-RxLevMin : -62 (-124 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw25
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 3
                          neighCellConfig : 40(2 bits)
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[5]
                          dl-CarrierFreq : 1000 (Band 2)
                          q-RxLevMin : -64 (-128 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 11
                          threshX-Low : 11
                          allowedMeasBandwidth : mbw50
                          presenceAntennaPort1 : false
                          neighCellConfig : 40(2 bits)
                        InterFreqCarrierFreqList[6]
                          dl-CarrierFreq : 2950 (Band 7)
                          q-RxLevMin : -64 (-128 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 11
                          threshX-Low : 11
                          allowedMeasBandwidth : mbw100
                          presenceAntennaPort1 : false
                          neighCellConfig : 40(2 bits)
                        InterFreqCarrierFreqList[7]
                          dl-CarrierFreq : 5070 (Band 12)
                          q-RxLevMin : -64 (-128 dBm)
                          t-ReselectionEUTRA : 1
                          threshX-High : 11
                          threshX-Low : 11
                          allowedMeasBandwidth : mbw50
                          presenceAntennaPort1 : false

    A rough guide (highest to lowest)
    B2/B7 ->B5/12/17 and then B2 used in border areas (10Mhz only) and some 2nd B7 carrier that I've yet to see deployed and a 10Mhz B12 carrier that I've yet to see as well.

    Ericsson RAN SIB5:

    Code:
    LTE RRC Signaling Messages
      Version : 20
      RRC Release Number : 14
      RRC Version Minor : 0
      RRC Version Major : 3
      RB ID : 0
      Physical Cell ID : 116
      E-ARFCN : 1025
      SFN : 0
      Channel : 2
      Bitmask of SIBS : 32
      Message Length : 97
      bcch-dl-sch
        message
          c1
            systemInformation
              criticalExtensions
                systemInformation-r8
                  sib-TypeAndInfo[0]
                    sib5
                      interFreqCarrierFreqList
                        InterFreqCarrierFreqList[0]
                          dl-CarrierFreq : 650 (Band 2)
                          q-RxLevMin : -60 (-120 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 4
                          neighCellConfig : 80(2 bits)
                          interFreqNeighCellList
                            InterFreqNeighCellList[0]
                              physCellId : 116
                              q-OffsetCell : dB-1
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[1]
                          dl-CarrierFreq : 5765 (Band 12)
                          q-RxLevMin : -62 (-124 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 3
                          neighCellConfig : 80(2 bits)
                          interFreqNeighCellList
                            InterFreqNeighCellList[0]
                              physCellId : 116
                              q-OffsetCell : dB-1
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[2]
                          dl-CarrierFreq : 5047 (Band 12/17)
                          q-RxLevMin : -62 (-124 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 3
                          neighCellConfig : 80(2 bits)
                          interFreqNeighCellList
                            InterFreqNeighCellList[0]
                              physCellId : 116
                              q-OffsetCell : dB-1
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[3]
                          dl-CarrierFreq : 3050 (Band 7)
                          q-RxLevMin : -60 (-120 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 8
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 4
                          neighCellConfig : 80(2 bits)
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[4]
                          dl-CarrierFreq : 2426 (Band 5)
                          q-RxLevMin : -60 (-120 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 3
                          neighCellConfig : 80(2 bits)
                          q-QualMin-r9 : -16
                        InterFreqCarrierFreqList[5]
                          dl-CarrierFreq : 2050 (Band 4)
                          q-RxLevMin : -64 (-128 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 5
                          neighCellConfig : 80(2 bits)
                          q-QualMin-r9 : -18
                        InterFreqCarrierFreqList[6]
                          dl-CarrierFreq : 2000 (Band 4)
                          q-RxLevMin : -64 (-128 dBm)
                          t-ReselectionEUTRA : 2
                          threshX-High : 6
                          threshX-Low : 2
                          allowedMeasBandwidth : mbw6
                          presenceAntennaPort1 : false
                          cellReselectionPriority : 5
                          neighCellConfig : 80(2 bits)
                          q-QualMin-r9 : -18
                      lateNonCriticalExtension
                        interFreqCarrierFreqList-v8h0[0]
                          multiBandInfoList
                            MultiBandInfoList[0]
                              FreqBandIndicator : 25
                        interFreqCarrierFreqList-v8h0[1]
                          multiBandInfoList
                            MultiBandInfoList[0]
                              FreqBandIndicator : 12
                        interFreqCarrierFreqList-v8h0[2]
                        interFreqCarrierFreqList-v8h0[3]
                        interFreqCarrierFreqList-v8h0[4]
                          multiBandInfoList
                            MultiBandInfoList[0]
                              FreqBandIndicator : 18
                            MultiBandInfoList[1]
                              FreqBandIndicator : 26
                        interFreqCarrierFreqList-v8h0[5]
                          multiBandInfoList
                            MultiBandInfoList[0]
                              FreqBandIndicator : 10
                        interFreqCarrierFreqList-v8h0[6]
                          multiBandInfoList
                            MultiBandInfoList[0]
                              FreqBandIndicator : 10
                        nonCriticalExtension
                          interFreqCarrierFreqList-v9e0[0]
                          interFreqCarrierFreqList-v9e0[1]
                          interFreqCarrierFreqList-v9e0[2]
                          interFreqCarrierFreqList-v9e0[3]
                          interFreqCarrierFreqList-v9e0[4]
                          interFreqCarrierFreqList-v9e0[5]
                            multiBandInfoList-v9e0
                              MultiBandInfoList-v9e0[0]
                                freqBandIndicator-v9e0 : 66
                          interFreqCarrierFreqList-v9e0[6]
                            multiBandInfoList-v9e0
                              MultiBandInfoList-v9e0[0]
                                freqBandIndicator-v9e0 : 66
    B4 -> B2/B7 ->B12/B17/B5


    There is also WCDMA SIB19, which I'll ignore since I am assuming we are talking about handing over between LTE cells.

    EDIT: See above. Keep in mind this depends on meeting the criteria for minimum signal/quality, which would take quite a bit of time time to calculate.

    EDIT 2: Added cutoffs and EARFCN to band conversions in bold
    Last edited by zivan56; 06-08-2018 at 12:20 AM.

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    isn't band 12 5047 and 5095, and band 17 5765.
    Duwenbasden
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    Yes, I swapped them around for some reason. Technically they are all B12 as well now with Ericsson RAN, as they broadcast MFBI in SIB1.
    Last edited by zivan56; 06-08-2018 at 10:08 AM.

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    LTE signal thresholds?

    Thanks zivan. Itís interesting how Rogers will move you around thru different bands even when the phone is stationary. You would think that if thereís strong enough B4 or B2, it would just remain locked on that band instead of switching to B12/17...unless of course the conditions of the B2/4 signal are changing (or deteriorating) so frequently, causing the change over to the lower band. One interesting thing I find about Rogers is that low band LTE switching seems to be a bit more fine tuned than Bellus. For example, a Rogers phone will be handed off to B12/17 successfully from a higher band (at high band LTE cell edge) whereas Bellus will drop to 3G temporarily before regaining LTE on a lower band (B5/13/17). It doesnít happen everywhere but it does happen.

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    Quote Originally Posted by Orcadas View Post
    I don't know how they configure their thresholds but I have the same "issue" as you!
    I got the same issue. But Telus and Bell are more consistent.

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    Quote Originally Posted by toolcube View Post
    Thanks zivan. It’s interesting how Rogers will move you around thru different bands even when the phone is stationary. You would think that if there’s strong enough B4 or B2, it would just remain locked on that band instead of switching to B12/17...unless of course the conditions of the B2/4 signal are changing (or deteriorating) so frequently, causing the change over to the lower band. One interesting thing I find about Rogers is that low band LTE switching seems to be a bit more fine tuned than Bellus. For example, a Rogers phone will be handed off to B12/17 successfully from a higher band (at high band LTE cell edge) whereas Bellus will drop to 3G temporarily before regaining LTE on a lower band (B5/13/17). It doesn’t happen everywhere but it does happen.
    Also uses more battery life switching back and forth for no reason. Telus and Bell IMO have a far more superior and stable network than Rogers. Ive used all of them extensively and stuck with Telus.

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    LTE signal thresholds?

    Agreed on the network superiority comment. Thatís why Iím also with Telus

    Not sure that the frequent inter-LTE band switching is for no reason though...thatís why I was interested in knowing how the Rogers thresholds are configured.

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    If you have a phone with built in network signalling recording (like LG, Oneplus, etc), you can record all the network messages into a qmdl file and send it to me, and I can tell you why it is happening most likely.

    There quite a few reasons why that could happen on any provider.

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