Connect (X)

Tag Archives: SK Telecom

SK Telecom, Samsung Complete 5G Trial at 3.5 GHz

July 3, 2017 — 

SK Telecom and Samsung Electronics have completed an end-to-end trial at 3.5 GHz using Samsung’s 5G virtualized core, virtualized RAN, Distributed Unit (baseband unit and radio unit) and test device that are based on the latest 3GPP 5G NR standards elements.

Results achieved were speeds over 1 Gbps and latency of 1.2 millisecond, which was achieved by reducing the transmission time interval (TTI) down to 0.25 millisecond, or about one quarter of 4G LTE’s transmission time. In addition to the latency improvements, carrier aggregation allowed them to achieve a channel bandwidth of 80 megahertz, while 20 megahertz is the maximum channel bandwidth for LTE, which made consistent gigabit performance possible.

Samsung said virtualization played a significant role in the trial’s success. New applications and functions for services can be deployed with Mobile Edge Computing (MEC), according to the OEM.

SK Telecom and Samsung have been exploring 5G communications in the 28 GHz band, which enables the fast transmission of large volumes of data across wide bandwidths. On the other hand, 3.5 GHz offers a broader, more stable, network coverage area.


xRAN – Coming To a Network Near You

November 10, 2016 — 

By Ernest Worthman

Executive Editor, AGL Small Cell Magazine

    Those of you who read what I write from time to time know that I like to call the IoT the IoX – for the internet of anything/everything. I like that acronym for a couple of reasons. One because it encompasses the many different renditions of this new ecosystem; internet of many things, industrial internet of things, internet of your things, internet of medical things, and so on. Most of these are just the brain children of the “internet of marketers” trying to carve out a niche that they can use to leverage their particular interest.

The other reason is that the letter “x” is kind of the de facto symbol for “anything.” So using the term the internet of anything/everything makes it much easier to talk about, well…anything and everything.

And sometimes others catch that too. For example, recently, Deutsche Telekom, AT&T and SK Telecom came together to present a different approach to promote radio access networks (RANs) that are software-based. This is a shift from today’s traditional highly proprietary RAN infrastructure. They call it xRAN – nice.

These players took advantage of the next-generation mobile network (NGMN) conference in Frankfurt to present this next-generation platform. It presents the potential to deploy network function virtualization and software defined networks versus the core network where most of the software deployment has been focused, to date.

The organization, called xRAN.org, is determined to implement open interfaces which can decouple the control plane and make use of the EnodeB base stations. This as an alternative to the existing closed, distributed control implementations on proprietary hardware. This new vector of extensible RANs will allow much better use of spectrum assets, as well as reduce opex and capex. And they can be implemented across many different networks.

xRAN looks like it will get legs. Intel, Texas Instruments, Aricent, Radisys all have shown support for it and several others are looking seriously at supporting it. If xRAN gets the traction, it has the potential to radically alter the mobile network landscape of how these networks are built and managed.

Virtual Technology Reinventing the Network Core

By Ernest Worthman

March 17, 2016 — Virtual network technology that will be essential for 5G is showing up in the network core. A new technology called “slicing” has debuted. Network slicing is considered a key technology for 5G core network infrastructure as it enables a single physical network to be portioned into multiple virtual mobile networks to offer optimal support for different services.

On the real bleeding edge, SK Telecom plans to unveil the first 5G device prototype designed to support communication between vehicles and demonstrate virtual reality games. Three-dimensonal holograms are being positioned to realize realistic communications, which are one of the edge-of-the-envelope platforms that promise to emerge in 5G.

And, a leading chip company, Cavium, is focused on enabling software-defined networking and network functions virtualization to support 5G network architectures.

Converged FDD+TDD Carrier Aggregation Tops 500 Mbps

Carrier aggregation development, which has been accelerating in the last year, led to products that were all the rage at the Mobile World Congress 2014 in Barcelona. Each promises giant leaps in data throughput.

Huawei’s demonstration of LTE-Advanced FDD+TDD convergence carrier aggregation across FDD and TDD LTE modes and Vodafone’s involvement are particularly interesting, according to Steven Hartley, principal analyst at Ovum.

“The benefit of CA across FDD and TDD LTE is that operators can combine cheaper TDD spectrum with more traditional FDD spectrum to boost capacity and downlink speeds,” Hartley said.

The demonstration, involving three FDD carriers and one TDD carrier, produced a single user peak downlink speed of an eye-popping 500 Mbps.

“In this case where partners are promising more than 500 Mbps, the cost efficiencies for an operator of leveraging the full range of spectrum assets available is unquestionable, but most operators have so far shied away from the technical complexities involved,” Hartley said.

Using Huawei’s technology, Vodafone combined 50 megahertz of FDD spectrum in the 800-MHz, 1800-MHz and 2600-MHz bands with its 20 megahertz of TDD spectrum in the 2600-MHz band in Spain.

Carrier aggregation speeds contrast glaringly with Vodafone’s 1800-MHz and 2600-MHz commercial LTE services, which were rolled out at the beginning of 2013 with a peak speed of 150 Mbps/user.

SK Telecom Demo Combines Three Channels

SK Telecom demonstrated LTE-Advanced by aggregating three bands at the Mobile World Congress. The carrier aggregation technology demonstration combined three 20-megahertz channels to offer speeds of up to 450 Mbps.

The Barcelona demonstration was only the latest in a rapid-fire string of new LTE-Advanced features from SK Telecom since last June. On Jan. 20, the carrier unveiled a wireless system that aggregates a 20-megahertz band and two 10-megahertz bands, supporting speeds of up to 300 Mbps. In November 2013, SK Telecom achieved throughput of 225 Mbps by aggregating a bandwidth of 20 megahertz in the 1.8-GHz band and a 10-megahertz channel at 800 MHz. In August 2013, the carrier combined a 20-megahertz downlink and a 15-megahertz uplink in the 1.8-GHz band; and in June, it combined a 10-megahertz channel in the 1.8-GHz band and a 10-megahertz channel in the 800-MHz band.

CA in Finland

Broadcom, Finnish carrier Elisa, and Nokia Solutions and Networks have demonstrated LTE-Advanced carrier aggregation on a live commercial network. The test aggregated two 20-megahertz channels in the 1800-MHz band and the 2600-MHz band to reach speeds of 300 Mbps.

Ted Abrams, Abrams Wireless, said that carrier aggregation is a milestone in spectral efficiency. But because it is only included in the latest version, Release 10, of the LTE-Advanced standard, it will take time to be rolled out to all U.S. networks.

“This gives all operators, large and small, the opportunity to harvest spectrum from various bands and carry broadband traffic through the air with an aggregated, composite carrier. Most of the LTE equipment deployed in the U.S.A. is Release 9, so it will be a while before all networks incorporate the carrier aggregation features of LTE-A,” he wrote.

Carrier Aggregation to Become a Reality in 2014

With spectrum and data speed equating to customer retention, channel aggregation must seem like manna from heaven to carriers. Speeds have always been restricted in part by the amount of contiguous spectrum available.

Alex Jinsung Choi, head of ICT R&D Division at SK Telecom, said in a press release that LTE can only offer up to 150 Mbps of speed using a maximum of 20 megahertz of continuous spectrum in one band, while LTE-Advanced can support speeds over 150 Mbps by combining different bands through carrier aggregation.

However, the roll out of Release 10 of the 3rd Generation Partnership Project’s LTE standard changes all that. Now, intra-band, inter-band and non-contiguous spectrum can be aggregated into one virtual pipe, allowing efficient use of fragmented spectrum, and it can be used for both FDD and TDD.

LTE-Advanced, specified in Release 10 of the LTE standard, supports up to five carriers up to total aggregate bandwidth of 100 megahertz of spectrum. Now that’s a big pipe!

SK Telecom Develops LTE-Advanced 3-band Carrier Aggregation

Uber-cutting-edge carrier SK Telecom plans to demonstrate LTE-Advanced by aggregating three bands at Mobile World Congress 2014, Feb. 24-27, in Barcelona, Spain. The carrier aggregation technology demonstration will combine three 20-megahertz channels to offer speeds of up to 450 Mbps.

The Barcelona demonstration is only the latest in a rapid-fire string of new LTE-Advanced features at SK Telecom since last June. On Jan. 20, a wireless system was unveiled by the carrier that aggregates a 20-megahertz band and two 10-megahertz bands and supports speeds of up to 300 Mbps. Once the related chipset and devices are developed, the technology is expected to go commercial by the end of 2014.

In November 2013, SK Telecom demonstrated an LTE-Advanced service that offered up to 225 Mbps by aggregating a bandwidth of 20 megahertz in 1.8 GHz band and a 10-megahertz channel at 800 MHz. It expects to launch a commercial 20+10 system in the second half of 2014.

In August 2013, the carrier was authorized to operate a system using a 20-megahertz downlink and a 15- megahertz uplink in the 1.8 GHz band; and in June, it launched an LTE-Advanced service using a 10-megahertz channel in the 1.8 GHz band and a 10-megahertz channel in the 800 MHz band.