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[Tools, Tips & Tutorials] [MIUI DEVICE TEAM] Mi 5 3-Carrier Aggregation Technology Explained!

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19112 129 |
17:11, Oct-24-2016 | From PC
Go to reply no.
This post was edited by mitch002 at 12:43, Oct-25-2016

Mi 5 3-Carrier Aggregation Technology Explained
by mitch002

3 CA.png

This feature called Carrier Aggregation is a feature present in the Mi 5, but what really is it? It's basically called LTE-CA.

Now let me quote some highlights from on what LTE-CA is all about.

LTE CA: Carrier Aggregation Tutorial
4G LTE Advanced CA, carrier aggregation or channel aggregation enables multiple LTE carriers to be used together to provide the high data rates required for 4G LTE Advanced.
LTE Advanced offers considerably higher data rates than even the initial releases of LTE. While the spectrum usage efficiency has been improved, this alone cannot provide the required data rates that are being headlined for 4G LTE Advanced.

To achieve these very high data rates it is necessary to increase the transmission bandwidths over those that can be supported by a single carrier or channel. The method being proposed is termed carrier aggregation, CA, or sometimes channel aggregation. Using LTE Advanced carrier aggregation, it is possible to utilize more than one carrier and in this way increase the overall transmission bandwidth.

These channels or carriers may be in contiguous elements of the spectrum, or they may be in different bands.

Spectrum availability is a key issue for 4G LTE. In many areas only small bands are available, often as small as 10 MHz. As a result carrier aggregation over more than one band is contained within the specification, although it does present some technical challenges.

Carrier aggregation is supported by both formats of LTE, namely the FDD and TDD variants. This ensures that both FDD LTE and TDD LTE are able to meet the high data throughput requirements placed upon them.

LTE carrier aggregation basics
The target figures for data throughput in the downlink is 1 Gbps for 4G LTE Advanced. Even with the improvements in spectral efficiency it is not possible to provide the required headline data throughput rates within the maximum 20 MHz channel. The only way to achieve the higher data rates is to increase the overall bandwidth used. IMT Advanced sets the upper limit at 100 MHz, but with an expectation of 40 MHz being used for minimum performance. For the future it is possible the top limit of 100 MHz could be extended.

It is well understood that spectrum is a valuable commodity, and it takes time to re-assign it from one use to another in view - the cost of forcing users to move is huge as new equipment needs to be bought. Accordingly as sections of the spectrum fall out of use, they can be re-assigned. This leads to significant levels of fragmentation.

To an LTE terminal, each component carrier appears as an LTE carrier, while an LTE-Advanced terminal can exploit the total aggregated bandwidth.

RF aspects of carrier aggregation

There are a number of ways in which LTE carriers can be aggregated:

Types of LTE carrier aggregation

  • Intra-band: This form of carrier aggregation uses a single band. There are two main formats for this type of carrier aggregation:

    • Contiguous: The Intra-band contiguous carrier aggregation is the easiest form of LTE carrier aggregation to implement. Here the carriers are adjacent to each other.

      Contiguous aggregation of two uplink component carriers

      The aggregated channel can be considered by the terminal as a single enlarged channel from the RF viewpoint. In this instance, only one transceiver is required within the terminal or UE, whereas more are required where the channels are not adjacent. However as the RF bandwidth increases it is necessary to ensure that the UE in particular is able to operate over such a wide bandwidth without a reduction in performance. Although the performance requirements are the same for the base station, the space, power consumption, and cost requirements are considerably less stringent, allowing greater flexibility in the design. Additionally for the base station, multi-carrier operation, even if non-aggregated, is already a requirement in many instances, requiring little or no change to the RF elements of the design. Software upgrades would naturally be required to cater for the additional capability
    • Non-contiguous: Non-contiguous intra-band carrier aggregation is somewhat more complicated than the instance where adjacent carriers are used. No longer can the multi-carrier signal be treated as a single signal and therefore two transceivers are required. This adds significant complexity, particularly to the UE where space, power and cost are prime considerations.

  • Inter-band non-contiguous: This form of carrier aggregation uses different bands. It will be of particular use because of the fragmentation of bands - some of which are only 10 MHz wide. For the UE it requires the use of multiple transceivers within the single item, with the usual impact on cost, performance and power. In addition to this there are also additional complexities resulting from the requirements to reduce intermodulation and cross modulation from the two transceivers

The current standards allow for up to five 20 MHz carriers to be aggregated, although in practice two or three is likely to be the practical limit. These aggregated carriers can be transmitted in parallel to or from the same terminal, thereby enabling a much higher throughput to be obtained.

Carrier aggregation bandwidths
When aggregating carriers for an LTE signal, there are several definitions required for the bandwidth of the combined channels. As there as several bandwidths that need to be described, it is necessary to define them to reduce confusion.

LTE Carrier Aggregation Bandwidth Definitions for Intra-Band Case

LTE carrier aggregation bandwidth classes

There is a total of six different carrier aggregation, CA bandwidth classes which are being defined.

NB: classes D, E, & F are in the study phase.

LTE aggregated carriers
When carriers are aggregated, each carrier is referred to as a component carrier. There are two categories:
  • Primary component carrier: This is the main carrier in any group. There will be a primary downlink carrier and an associated uplink primary component carrier.
  • Secondary component carrier: There may be one or more secondary component carriers.

There is no definition of which carrier should be used as a primary component carrier - different terminals may use different carriers. The configuration of the primary component carrier is terminal specific and will be determined according to the loading on the various carriers as well as other relevant parameters.

In addition to this the association between the downlink primary carrier and the corresponding uplink primary component carrier is cell specific. Again there are no definitions of how this must be organised. The information is signalled to the terminal of user equipment as part of the overall signalling between the terminal and the base station.

Carrier aggregation cross carrier scheduling
When LTE carrier aggregation is used, it is necessary to be able to schedule the data across the carriers and to inform the terminal of the DCI rates for the different component carriers. This information may be implicit, or it may be explicit dependent upon whether cross carrier scheduling is used.

Enabling of the cross carrier scheduling is achieved individually via the RRC signalling on a per component carrier basis or a per terminal basis.

When no cross carrier scheduling is arranged, the downlink scheduling assignments achieved on a per carrier basis, i.e. they are valid for the component carrier on which they were transmitted.

For the uplink, an association is created between one downlink component carrier and an uplink component carrier. In this way when uplink grants are sent the terminal or UE will know to which uplink component carrier they apply.

Where cross carrier scheduling is active, the PDSCH on the downlink or the PUSCH on the uplink is transmitted on an associate component carrier other than the PDCCH, the carrier indicator in the PDCCH provides the information about the component carrier used for the PDSCH or PUSCH.

It is necessary to be able to indicate to which component carrier in any aggregation scheme a grant relates. To facilitate this, component carriers are numbered. The primary component carrier is numbered zero, for all instances, and the different secondary component carriers are assigned a unique number through the UE specific RRC signalling. This means that even if the terminal or user equipment and the base station, eNodeB may have different understandings of the component carrier numbering during reconfiguration, transmissions on the primary component carrier can be scheduled.

Wait Wait Wait!!! Are You Confused?
To make the explanation short and easy to understand, The LTE-CA utilizes different bandwidth and combine it to give you a more faster data speed. In my country Globe Telecoms deploys Band 3 and Band 41, now what if LTE-CA combined it both? I received a top speed of 48Mbps on 4G+.

Imagine Son Goku is Band 3 and Vegeta is Band 41, they both are powerful, and when they combined? BOOM! Unimagineable powers!

goku.jpg + SS_5.jpg


Now I have made some testing my own and found out that Globe Telecoms really deploys Band 3 and Band 41 at the same time. I used Network Signal Guru App but it needs phone to be Rooted



Now normal speed of 4G here in my area is just 6Mbps, But with 4G+ I did achieve a 25Mbps in a Non-Business Center area, not bad.



Now problem with Mi 5 is the proper deployment of this new technology, it's very fresh but not yet perfect. In fact many Mi 5 users here in the Philippines gets no signal due to the improper integration of the LTE-CA resulting to no signal at all.

The temporary fix is to disable one of the bands which is Band 3 using QXDM, then signal will begin to normalize.


Hope Mi 5 Developers will work on this and give us a good LTE-CA integration in the future updates.

Mitch002 Signing Off!!


Credits: @Navin for sharing his knowledge to me

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00:58, Feb-26-2017 | From PC
This post was edited by vvevvevve at 12:42, Feb-26-2017

Here's my xqcn file that can be used to enable CA_3_7, CA_3_38, CA_7_3, CA_38_3, CA_3_7_7, CA_7_3_7 and CA_7_7_3 CA combos on Mi5.
Extensive tests in Russian MTS and Megafon networks have revealed that CA_3_7 and CA_3_7_7 work exellent, while with active CA_7_3, CA_7_3_7 and CA_7_7_3 combos there are some instability issues that seem to be phone(modem firmware?)-related (other devices work well in similar cases).
CA_3_38 and CA_38_3 haven't been tested yet since there's no support of them here until 2017Q2 at least.

In order to make use of mentioned xqcn file you should add its contents to phone's modem subsystem' filesystem, EFS. This can be done with QPST, for example. Switch phone's USB composition to one with diagnostic port included (code *#*#717717#*#* in dialer), install Qualcomm drivers for diag port (VID_05C6&PID_90AD&MI_00), run QPST Configuration app and add diag port to its list (if not added automatically). Next, launch QPST Software Download app, select Restore tab, set path to xqcn file and push the Start button. Added CA combos will become active right after reboot.

Does anybody know the way to contact Xiaomi's firmware developer team? It would be great to dicsuss numerous CA-related stuff with them - say, CA_7_* issues mentioned above and some other things.

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17:25, Oct-24-2016 | Via mobile
nice info

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18:14, Oct-24-2016 | From PC
Thanks for sharing this excellent thread. You are awesome

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18:55, Oct-24-2016 | From APP
Cool explanation!

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19:05, Oct-24-2016 | From Mi 5
Thanks for sharing

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19:17, Oct-24-2016 | From Redmi Note 3
Thanx for info

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19:22, Oct-24-2016 | From Mi 5
great job boy

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19:34, Oct-24-2016 | From PC

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20:34, Oct-24-2016 | From Mi 5
And here I am getting only 3G/HSPA+. I really wish Xiaomi included more bands in their phones.

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20:48, Oct-24-2016 | From Mi Note
thanks for share

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