LTE Advanced Carrier Aggregation

Taking user experience to the next level.

Qualcomm Technologies has helped make carrier aggregation mainstream, with global proliferation, which benefits the entire mobile ecosystem — Operators, App developers, and OEMs —  by delivering higher data rates, improved capacity, and the ability to use spectrum fragments.

Delivering successively higher data rates.

Carrier aggregation offers successively higher peak data rates as well as better broadband experience across the coverage area. 


The date rates scale with the amount of spectrum allowing 3GPP Rel 10 to support up to 5 carriers with up to 100 MHz of spectrum and commercial solutions to support up to 3 carriers with peak data rates up to 450 Mbps (Cat 5).

Higher capacity for bursty applications.

Increased data rates of carrier aggregation can be traded off to get higher capacity for bursty applications, such as web browsing, streaming, social media apps and others, meaning operators can choose a higher capacity for the same user experience, better user experience for the same capacity, or both.

Carrier aggregation benefits the whole ecosystem.


Users gain next-level user experience:

  • Higher data rates with lower latency across the network
  • Faster downloads of pictures, files, webpages, higher quality videos, etc.


Operators can make the most of all spectrum assets:

  • Higher network capacity
  • Opportunity to offer new apps/services which use higher data rates and capacity

App Developers

Developers can transform mobile experiences:

  • Substantially richer user experience
  • New immersive multimedia, such as 4K
  • Fully utilize multimedia and connectivity of modern smartphones


Manufacturers show technology leadership and differentiation:

  • Lead with early adoption
  • Offer tiered devices based on speed and device capability
  • Expand carrier aggregation proliferation to address global markets

First to announce commercial Cat 10 modem

We were the first in the mobile industry to announce a Cat 10 solution, the Qualcomm® Snapdragon™ X12 LTE Modem, which supports carrier agregation with peak data rates of up to 450 Mbps downlink and up to 150 Mbps uplink.

Support Across Tiers: Snapdragon LTE Modems

We offers carrier aggregation across our product tiers: from Snapdragon 200 to Snapdragon 800 processors and from Snapdragon X5 to X12 modems.

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    A new kind of spectrum for new opportunities

    Last year, the FCC opened up 150 MHz of spectrum in the U.S. around 3.5 GHz that it named Citizens Broadband Radio Service (CBRS), not to be confused with the old CB radio. Hidden under that name is a novel approach of making more spectrum available when and where it can be used. As spectrum is the life blood of wireless communication, the FCC’s move has the potential to create new wireless opportunities, which for consumers means new and better services.

    So what is the new approach in CBRS? First, it enables others to use the spectrum while it is still being used by existing incumbents, such as the military or satellite communication, see Figure 1. This in itself is not new. As a matter of fact, we helped to introduce this concept back in 2013 with Licensed Shared Access (LSA), where a license holder exclusively shares the spectrum with the incumbent. This is a powerful concept that unlocks more spectrum for wireless communication.

    In addition to sharing with incumbents — CBRS adds a ‘third-tier’ of general usage. In this third-tier, anyone can use the spectrum when it is not used by the higher tiers (the incumbents or users that paid for a license), see Figure 2. Of course, if there are multiple third-tier users in the same area then they will share the available spectrum with each other in a fair manner. The complexity of managing three tiers will require some additional control. To this effect, the FCC has defined a Spectrum Access System (SAS) — a type of database, in effect — and the Wireless Innovation Forum is helping to specify the details to ensure that it all works in accordance with the FCC rules.

    So what exciting things will this new kind of spectrum enable? Let’s look at some examples. First it can be used by existing mobile operators to offer Gigabit LTE speeds in more places by making more spectrum available. One can also use this spectrum for small-cell deployments to extend coverage and add capacity indoors. Another example is what we call neutral host, which is a LTE deployment that can be used by subscribers irrespective of their service provider. Such a solution makes sense in places where it is not feasible for each operator to deploy its own radio systems independently; for example, in public venues such as sports stadiums, or in places where it is not cost effective to do so, like indoor coverage in malls or hotels. This approach benefits the venue owner, the mobile operator and the end users. The three-tier approach also enables new entities to offer services by creating their own so-called private LTE networks without owning any spectrum. Such private LTE networks can be used for industrial IoT or enterprise use in general. But let’s not stop there. By enabling anyone to create a LTE-based network, the sky is the limit, literally.

    We are not alone at being excited about this new spectrum. Together with five partners we started the CBRS Alliance, which was announced this week, and are working toward field trials later this year. The CBRS Alliance will focus on supporting the commercialization of LTE-based solutions in the CBRS band and is encouraging companies that want to help accomplish this goal to join — for more info see their webpage. From our end, we are getting ready for CBRS by making multiple LTE-based solutions available: LTE-TDD, Licensed Assisted Access (LAA) and MulteFire. Each of these offers different benefits and can co-exist together in the CBRS spectrum. As with CBRS, all good things come in threes!

    2016년 8월 29일