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Interessant artikel van Qualcomm over de toekomst van LTE (Advanced) en de toepasbaarheid daarvan, oa mbv het combineren van de diverse frequentie zoals bijv. van micro/femto cells voor het vergroten van de bandbreedte door middel van Carrier Aggregation.

LTE Advanced brings multiple dimensions of enhancements including leveraging wider bandwidth, more antennas and heterogeneous networks (HetNets), all of which are crucial to address the looming 1000x mobile data challenge. Carrier aggregation is the first step in LTE Advanced commercialization, offering increased user data rates for all users in the cell. The higher data rates can also be traded off to offer increased capacity for bursty applications such as web browsing. Carrier aggregation continues evolve into various directions including more carriers (up to 5 carriers and up to 100MHz supported in standards), across FDD and TDD, across cells and more.

 

 
LTE Advanced, Snapdragon, LTE TDD, LTE FDD, 1000x, Hetnets, carrier aggregation, data challenge, heterogenous networks, Gobi LTE

First with carrier aggregation

In June 2013, Qualcomm Technologies powered the world’s first LTE Advanced carrier aggregation launch using industry-leading Qualcomm SnapdragonTM 800 chipsets, integrated with third-generation Qualcomm GobiTM LTE modems. As a first step, the launch supported aggregation of two 10 MHz carriers enabling peak data rates of 150 Mbps (Cat 4).
 
 
 
1000x, carrier aggregation, hspa+, lte, lte tdd, lte fdd, lte advanced, dual carrier, cell edge, coverage, 1000x, rates, speed

More carriers means more speed across the cell

Carrier aggregation essentially combines carriers at the device to increase the user rates across the cell coverage area, be it close to the cell or at the edges. In the first step, the carrier aggregation is only in the downlink, and is across two 10 MHz carriers, doubling the data rates for all users in the cell.
 
 
 
carrier aggregation, lte, lte advanced, lte tdd, lte fdd, capacity gain, 1000x, data challenge, network loading, data rates

Can double capacity for bursty applications

The increased data rates of carrier aggregation can be traded off to get twice or more capacity for bursty applications, while maintaining the same user experience, under typical network loading conditions. As evident, when carriers are aggregated, there are more resources, but due to trunking efficiency the overall capacity can be much more than the sum total of the capacity of the individual carriers. The increased capacity will help operators to address bursty smartphone traffic as well as increased use of social media applications, instant messaging and others.

 
 
 
spectrum, 1000x, carrier aggregation, higher bands, data pipe, hotness, macros, bandwiths,lte, lte advanced, lte tdd, lte fdd,

Utilizing all spectrum resources

Generally, the available spectrum in most parts of the world is fragmented. Carrier aggregation is a glue that binds them together to offer wider bandwidths, while enabling utilization of all the available spectrum. Carrier aggregation allows combining lower and higher bands— leveraging better coverage of the former with higher availability of the latter. Supplemental Down Link (SDL) allows combining paired and unpaired spectrum to boost down link capacity. Similarly, carrier aggregation allows HetNets to make best use of spectrum, e.g. higher bands for small cell (3.5 GHz) and lower bands (700 MHz) for macros.

 
 
 
LTE Advanced, LTE, LTE TDD, LTE FDD, spectrum, aggregation, uplink, Wi-Fi, MultiFlow, supplemental downlink
 
 
 

Carrier aggregation continues to evolve

The current aggregation of two 10 MHz carriers is only the beginning. It will evolve in many directions. In the near term, there could be aggregation across more carriers—up to five defined in LTE Advanced—and more band combinations—more than 45 being defined in 3GPP; aggregation in the uplink etc. There is currently work going on to facilitate aggregation across cells on the same carrier for load balancing, called MultiFlow; aggregation across paired and unpaired spectrum (LTE FDD and TDD) and many more.

Meer informatie: Presentatie Qualcomm over LTE Advanced

Bron: www.qualcomm.com 

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