Categories
5G SA EPC EUTRAN LTE Mobile Networks RFCs & Standards SDM Security SIM Cards

The PLMN Problem for Private LTE / 5G

As the number of Private Networks built on LTE and 5G grow, how will PLMN allocation be managed?

Categories
5G SA EPC EUTRAN GSM LTE Mobile Networks RFCs & Standards

Pre-5G Network Slicing

5G introduces Network Slicing, or does it? A look at slicing mechanisms widely used in pre-5G networks.

Categories
5G SA EPC EUTRAN GSM LTE Mobile Networks RFCs & Standards Security

And the call was coming from… INSIDE THE HOUSE. A look at finding UE Locations in LTE

How to find a subscriber location within the network.

Categories
EUTRAN Mobile Networks

Enable GPS/GLONASS Sync on Huawei BTS3900

Our BTS is going to need an accurate clock source in order to run, so without access to crazy accurate Timing over Packet systems or TDM links to use as reference sources, I’ve opted to use the GPS/GLONASS receiver built into the LMPT card. Add new GPS with ID 0 on LMPT in slot 7 […]

Categories
EPC EUTRAN LTE Mobile Networks RFCs & Standards

Cell Broadcast in LTE

A look at how Cell Broadcast is signalling implemented between the MME and CBC in an LTE/EPC network.

Categories
EUTRAN LTE Mobile Networks

Huawei BTS 3900 LMPT Basic Config

This post is one in a series documenting my adventures attempting to configure a used BTS 3900 to function as a eNB in my lab. There are 5 network ports on the LMPT card: 2x SFP cages – SFP 0 and SFP 1 1x 10/100 Ethernet port – ETH – Used to access the Local […]

Categories
EUTRAN LTE Mobile Networks RF

Huawei BTS3900 – MML Basics

Learning Huawei’s flavour of MML – Man Machine Language for the BTS 3900 series Macro Base Stations.

Categories
EUTRAN LTE Mobile Networks

Connecting to a Huawei BTS3900

Meta: This post is a series chronicling my adventures with a second hand Huawei BTS3900 I purchased. You can find an index of these posts here. So you purchased a used Macro base station online, good for you. Now you need to know how to configure it. First things first, you’ll need to connect to […]

Categories
EUTRAN LTE Mobile Networks RF

DIY RAN Adventures – Antennas

Picking and validating antenna selection for the new RAN project in my lab.

Categories
EUTRAN LTE Mobile Networks

My used Huawei BTS3900 LTE RAN Adventure – The Impulse Purchase

How I ended up with a Macro LTE eNodeB (Huawei BBU3900) and getting it running.

Categories
EPC EUTRAN LTE Mobile Networks

S1AP – Relative Capacity (87) on MME

Functionality of eNB MME selection based on Relative Capacity IE

Categories
EUTRAN LTE Mobile Networks

Viewing the SIB – The LTE System Information Block with SDRs

Using SDR hardware to view the LTE System Information Block’s contents.

Categories
EUTRAN LTE Mobile Networks RFCs & Standards Software

Diameter Dispatches – Origin-State-Id AVP

What the Origin-State-Id AVP does and how it is used to track if a Diameter peer restarts.

Categories
EPC EUTRAN LTE Mobile Networks SDM SIM Cards

BaiCells USIM PLMN Issues (MNC 314 / MCC 030 vs MNC 311 / MCC 98)

Why the BaiCells PLMN changes?

Categories
EPC EUTRAN LTE Mobile Networks RFCs & Standards

LTE UE Attach Procedures in Evolved Packet Core (EPC)

A look into the signalling messages between Network elements in an Evolved Packet Core exchanged during the Attach Procedure

Categories
EUTRAN IMS / VoLTE LTE Mobile Networks RFCs & Standards SDM Voice over IP

Diameter and SIP: Registration-Termination-Request / Answer

These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Registration-Termination Request / Answer allow a Diameter Client (S-CSCF) to indicate to the HSS (Diameter Server) that it is no longer serving that user and the registration has […]

Categories
EUTRAN LTE Mobile Networks

srsLTE Install for BladeRF & LimeSDR on Debian / Ubuntu

Note: I’m running version 19.12.0 which I installed from the repos due to issues with 20.4.0 (latest when I wrote this) and stability on LimeSDR. I wrote the other day about installing SRS LTE stack, But installing it is one thing, meeting all the requirements to use it with your SDR hardware turns out to […]

Categories
EPC EUTRAN GSM IMS / VoLTE LTE Mobile Networks

Sending SMS in Open5GS LTE Networks using the SGs Interface and OsmoMSC with SMSoS

Sending SMS over LTE using OsmoMSC and OsmoHLR and the SGs interface for SMSoS

Categories
EPC EUTRAN GSM LTE Mobile Networks

OsmoMSC and Open5GS MME – SGs Interface for CSCF / InterRAT Handover

Looking into the SGi interface for Circuit Switched Fallback in LTE to use GSM/UMTS networks for Calls & SMS

Categories
EUTRAN LTE Mobile Networks

Working with LTE MAC traces in Wireshark

Using Wireshark to view and analyze MAC layer LTE traffic