LTE Advanced/Carrier Aggregation

I'm a Contributor Level 1 kevinj1
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LTE Advanced/Carrier Aggregation

Does Fido have carrier aggregation, and if so, in which configurations?  I have an M4 Aqua I bought from Fido, and I have never seen it on anything but AWS (1700/2100 aka Band 4).  I know it also supports LTE bands 7 (2600mhz) and also 12/17 (700mhz).  Does Fido support LTE-Advanced like it's parent company?  Also, I am in Ottawa, which on rogers coverage does not have LTE-Advanced.  Odd, since we were the launch market for Rogers LTE in 2011.  Supposedly, Rogers has aggressive LTE-Advanced rollout plans, but we are getting close to the end of the year, I was expecting to see it here by now.  


Also, if anyone knows of an app that allows me to switch LTE bands on a locked, unmodded M4 Aqua running 5.0 lollipop, that would also be greatly appreciated Smiley



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Re: LTE Advanced/Carrier Aggregation

@kevinj1 wrote:

Rachel - the connection to Fido LTE is very stable.  The speed is acceptable, i have seen it as high at 90 mbps down.  All I could find from qualcomm about the 615 is that it was a category 4 LTE device, meaning it was LTE-Advanced capable, but only with 20 MHZ of combined frequency in certain configurations.  I think Fido band 4 is 20 mhz, and 2600 mhz is 10mhz so that is likely why it will not leave band 4. 




  Just to clarify, a category 4 LTE device does not necessarily mean the device is LTE-A capable. The LTE categories only define maximum transmission speeds. For example, a category 4 device/network is capable of maximum download of 150 Mbits and upload of 50 Mbits. 


  While a category 4 device may indeed be LTE-A capable, those capabilities are dependent on hardware. For example, the following screen capture of 412 and 415 processors is taken from the comparison of Qualcomm Snapdragon processors.

Snapdragon 400.jpg
   If you note, both integrated modems are category 4 but only the modem in the Snapdragon 412 is capable of LTE-A.


  The processor in the M4 is the Snapdragon 615:

Snapdragon 615.jpg


    Unfortunately, the Snapdragon 615 does not appear to be capable of LTE-A.



  With regards to band selection, the phone would select the best band given the circumstances ie signal strength, channel bandwidth, etc.


  Bandwidths are scalable (1.4, 3, 5, 10, 15, 20 MHz), designed to help operators more easily migrate from narrowband technologies (e.g., GSM and CDMA2000) to LTE while also recognizing that wider bandwidth deployments of LTE would be required to achieve the target peak data rates (taken from here).


  Assuming the Fido bandwidths you mentioned are correct, then the phone would connect at 2x10MHz on band 4 and 2x5MHz on band 7. I suspect under different circumstances ie poor band 4 signal strength combined with good band 7 or 17 signal strength, the phone will use another band.


Hope this helps Smiley



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Re: LTE Advanced/Carrier Aggregation


Hello again,



I only have two Component Carriers, band 7 and 12. Does it mean it's not carrier-aggregation?


  Do you mean you have a freq_band_ind main band and component carrier 0 aggregation band or that you have two component carriers, 0 and 1 in addition to the freq_band_ind?


  The former would be 2 component-carrier carrier aggregation (2CC CA) with B7 main band and B12 as aggregation. The latter scenario would be 3 component-carrier carrier aggregation (3CC CA) with B? main band and B7 & B12 as aggregation.


  Either way, you are getting carrier aggregation. Without carrier aggregation or LTE-Advanced (LTE+), the phones would only connect to a single band. There would be no component carriers. The CA Status would state not configured or disabled or something to that effect.


Hope this helps Smiley



It’s the former. B4, main band (with MNC 720. Never got on 370) with B7&12 as aggregation. 

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