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IP and Mobile Trends and Education

 
10.2018

3GPP Release-16: Further LTE and 5G NR Enhancements

This year we have seen the rapid standardization of 3GPP Rel-15, 5G-NR, laying the foundation for the first 5G networks. This blogpost, discusses the ideas and enhancements that are currently being worked on for 3GPP Release-16. These enhancements cover not only 5G-NR, but also LTE which is being advanced in parallel.

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09.2018

Step in another direction in Wi-Fi? IEEE 802.11ax (High Efficiency WLAN)

The 802.11ax brings important features, focusing on network capacity, latency and range. High data rates are still in the picture, but rather in the background. Introducing OFDMA and using MU-MIMO allows AP to schedule data for multiple users simultaneously. This way, latency can be greatly decreased. With the new colors of the channels, frequencies can be spatially reused.

08.2018

Wi-Fi Radio Configuration & Measurements

This post discusses selected practical aspects of Wi-Fi systems including: explanation of some parameters and factors that the network performance is impacted by; showing how to configure some of the parameters them using CISCO Wireless LAN Controller; presenting simulated scenarios to show some examples of radio measurements.

07.2018

LTE and 5G Differences: System Complexity

In this post we discuss the complexity that 5G brings and show some examples of this as compared to LTE including: naming in the 5GS architecture, dual connectivity options in 5G, parameters for L1, base station naming, spectrum aspects.

07.2018

How we ended up in WPA3? – Wi-Fi Security Evolution

Introduction to Wi-Fi Security Distributing data using wireless medium means that anyone can capture the signal. There is no boundary, like in case of cable communication, which prevents unwanted access. This means we must take other security measures. In this blogpost we will review current algorithms providing Wi-Fi security and we will take a sneak […]

07.2018

5G Standards & Spectrum Focus Day – Overview

Our team – Marcin Dryjański, Marcin Biały and my humble person – went on a trip to London on June 11, where at the invitation of Knect365 (Informa Business), we participated in the Tech XLR8 fair in London. At this event, as part of the 5G World Series, Marcin Dryjanski had the pleasure to chair the 5G Standards & Spectrum Focus Day workshop.

06.2018

5G Interworking Architecture

In today’s blogpost we will discuss how the interworking architecture of the new 5G system with the existing LTE systems looks like. Inter-working between 4G and 5G will play a very important role in the early deployment of 5G system, which will rely on LTE to be the anchor or underlying system. In the standalone (SA) deployment of 5G, good inter-working with the LTE system to facilitate inter-RAT mobility between the two RATs will be required.

06.2018

Cisco WLC does not switch to newly added Radius server

Problem description I came across one of customer’s problem with Cisco wireless controller and 802.1x network. Radius service was driven by NPS (Microsoft Windows Radius). After setup of new NPS server customer configured the second Radius server on WLC swaping the radius server priority (on the first place under the WLAN Security -> Advanced tab […]

Author: Marcin Bialy
05.2018

Cisco AP can’t join the WLC controller… DTLS handshake failure.

The problem, network components and topology I recently faced the issue with AP join to vWLC. Cisco 2700 AP could not join to newly installed Cisco vWLC controller. Coleague asked me to take a look and explained the topology. The vWLC was located in Grandmetric DC Testing Labs whereas Cisco CAP-2700 was located at Grandmetric […]

Author: Marcin Bialy
05.2018

Wi-Fi Standards Evolution

Introduction First Wi-Fi networks appeared in late 90s and many of us use them ever since. During these years we could observe significant increase of throughput, but what is important, it is not only due to the ISP providing better link. Wi-Fi standard also evolved to keep up with the higher throughputs. If there will […]

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