Tag Archives: 4G

Performance of CS Fallback from LTE to UMTS

One of the key challenges for telcos deploying LTE networks is to provide voice services. While many solutions have been proposed, Circuit-Switched Fallback (CSFB) and Voice over LTE (VoLTE) are currently the two most talked about options. A new paper in the IEEE Communications magazine looks at CSFB performance in great detail. Here’s an excerpt from the abstra

Analysis results in well optimized deployments show that on an average, MO/MT call-setup time for CSFB from LTE to UMTS is around 1 sec greater than legacy UMTS. However, the results can vary depending on the network configuration and the conditions of the measurement. To illustrate the optimization of CSFB performance in real networks, we also highlight the principal call set up optimization and implementation factors impacting CSFB call setup delay and success rates. This article demonstrates that in well optimized networks, CSFB to UMTS call setup success rates can be very close to those achieved in the legacy UMTS systems.

Link to the paper

The reader is also referred to an Alcatel-Lucent whitepaper on the same topic.

Options for Providing Voice over LTE and Their Impact  on the GSM/UMTS Network

5G – The new buzzword

Now that the hype over 4G has somewhat reduced, 5G is slowly becoming the new thing. Lots of claims are being thrown around by vendors and silicon companies, staking claim to having achieved to having found the new holy grail, aka 5G. On one hand we have WiFi chip manufacturers referring to 802.11ac as ‘5G WiFi’ (ever heard of 3G/4G WiFi?) while there are the likes of Samsung who has tagged a new mm-wave based transmission scheme as 5G.

Real work on defining 5G (or the nearest equivalent) requirements has just started in ITU Working Party 5D. If IMT-Advanced was the equivalent of 4G, IMT-2020 technologies are expected to be branded as 5G. At the next meeting of 5D to be held in a few weeks time, various organizations will present their vision of 5G, in terms of technical requirements. Hence, the flurry of whitepapers from vendors:

5G radio access – research and vision (Ericsson)

On the road to 5G (NSN)

Various global telecom standards bodies like 3GPP, IEEE have been asked by ITU to submit their inputs for IMT-2020 requirements. Within 3GPP, there’s an ITU-R Ad-Hoc Group which is currently discussing this topic and preparing an input (Liaison Statement in 3GPP jargon). More details about that in the next blog.