The purpose of this article is to provide some background for network managers about the kinds of hardware diagnostics that are available from typical radio basestations (GSM BTS, UMTS NodeB, LTE eNodeB, 5G-NR gNodeB, etc.).
The global private network market is estimated at around US$3.5B already. Where are these networks and what are they used for? And why do customers install them?
Growing opportunities for spectrum access are making private cellular networks a reality in many parts of the world. The fastest regulatory developments are in the US, with Europe close behind.
This article describes the operation of the MTC Physical Downlink Control Channel (MPDCCH) for sending downlink assignments and uplink grants to the client device.
We do not just supply the radio network, but all of the planning, testing, and management the make the radio network useful.
A race to standardize the RAN architecture has left us with a confusing collection of terminology. We will try to put some order to it.
Cell broadcast (CB) is a way to deliver a text message to large numbers of handsets over the cellular network. Its main use today is the delivery of Public Warning System (PWS) messages, also called CMAS, ETWS, or other names in different parts of the world. The Legba Lab Kit is an easy and inexpensive way to generate PWS test messages on your bench.
Many 4G networks cannot carry plain old telephone calls, so many mobile operators support voice calls by transferring the handset to a 2G or 3G network for the duration of the call. The procedure for doing this is called “Circuit-Switched Fallback”, or CSFB. CSFB is an interesting procedure from a network operation perspective and from a security perspective. With a pair of Legba Lab Kits, one in 2G mode and one in 4G mode, you can reproduce and modify the CSFB procedure on a test bench.