Category Archives: LTE/5G

Is LTE-U DOA?

By | August 17, 2015

Reading some of the literature about LTE-U (and LAA) leads you to believe that its deployment is a foregone conclusion: operators love it; vendors support it, and products will be available within months. But operators lack the sales channel into the enterprise where LTE-U is envisioned to be deployed and provide most value. While LTE-U… Read More »

LTE Flavors in Unlicensed Spectrum

By | June 25, 2015

Guest post by Faris Alfarhan* The unprecedented increase in demand for high-speed broadband requires a bundle of solutions to satisfy the demanded capacity. Unlicensed spectrum is increasingly considered by cellular operators, internet service providers, and businesses as part of solution set. Unlicensed spectrum cannot match the quality of licensed spectrum, as the interference profile is… Read More »

Can Device-to-Device Communications Extend into the Home and SME?

By | April 6, 2015

DSL and LTE bonding is a technology that have been hovering under the radar, not receiving the attention it deserves. A few operators have been experimenting with it, and some deployed it. Vodafone targets the solution at the enterprise sector, while Deutsch Telekom sees it as complementary service in rural areas. DSL/LTE bonding combines a… Read More »

Further Enhanced ICIC (FeICIC)

By | May 7, 2014

Guest post by Faris Alfarhan* In an earlier post, R10-LTE enhanced inter-cell interference coordination (eICIC) techniques for heterogeneous networks were discussed, along with the concept of small cell range expansion. The purpose of cell range expansion is to offload more traffic from macro cells to small cells and hence achieve larger cell splitting gains. By… Read More »

Carrier Aggregation and the Road to Cognitive Radio and Superwide Spectrum

By | January 14, 2014

Often, the least hyped technologies are the most effective, get the widest adoption, and have the greatest impact. Carrier aggregation is one such technology that I don’t think it received its fair share of attention. LTE did bring a number of new features that were not available in 3G, such as MIMO. But MIMO was… Read More »

An Evaluation of LTE Frequency Selective Scheduling

By | October 9, 2013

Guest post by Faris Alfarhan* Channel dependent scheduling is commonly used in cellular systems. In LTE, orthogonal frequency division multiple access (OFDMA) in the downlink and single carrier frequency division multiple access (SC-FDMA) in the uplink allow scheduling to be performed orthogonally in both the frequency and time domains. Instead of exploiting the frequency diversity of… Read More »

Cloud RAN vs. Picocells: The Need for Integrative Approach in Next Generation Network Design.

By | April 18, 2013

When it comes to deciding on deploying small cell base stations, one is faced with a few options. One option is based on cloud RAN architecture with remote radio heads connected through optical fiber to a central base station housing the baseband processing. A second option is that of a compact base station which includes… Read More »

Should Small Cells Be Deployed In Their Own Spectrum Band?

By | April 9, 2013

Small cells raise a number of practical implementation questions which are yet to be resolved. One such question is whether small cells should operate in the same frequency band as the macrocell layer (co-channel deployment), or on a different frequency band. The question has profound implications to operators, vendors, and to regulators alike. To clarify,… Read More »

Unleashing the Power of HetNets: Interference Management Techniques for LTE-Advanced Networks

By | March 18, 2013

In my earlier blog post, The Hype & Reality of Small Cells Performance, I provided a qualitative review of small cell performance and discussed interference scenarios that limit performance. Perhaps the most defining problem of small cell deployments is the large transmit power imbalance between the macrocell and the small cell (~20-30 dB) which increases… Read More »

The Hype and Reality of Small Cells Performance

By | February 12, 2013

Heterogeneous networks (HetNets) consist of large (macro) cells with high transmit power (typically 5 W – 40 W) and small cells with low transmit power (typically 100 mW – 2 W). The small cells are distributed beneath the large cells and can run on the same frequency as the large cell (co-channel), or on a… Read More »

TD-LTE and the Hype Cycle: Where’s the Business Opportunity?

By | February 24, 2012

As a new wave of hype is building around TD-LTE, I wonder what the fuss is all about. For certain, TD-LTE is not a groundbreaking technology – it comes many years after WiMAX and quite a few after its older FD-LTE sibling. But what intrigues me most is the business model for TD-LTE and especially the dilemma of the TDD spectrum holder: what is a winning business model that maximizes the value of my operation and company? Without such a model, TD-LTE will be yet another technology toddler that never makes it to adulthood.

Use Cases for the 2.5/2.6 GHz Spectrum: Macro or Micro/Pico Cells?

By | February 13, 2012

Should operators deploy a macro or micro cellular architecture in 2.5 GHz band? This is not a trivial question particularly for an incumbent wireless operator that already holds spectrum in lower spectrum bands. The same can be said of Greenfields looking to capitalize on the exponential demand for wireless data services.