This post is one of a series of packet capture analysis challenges designed to test your ability to understand what is going on in a network from packet captures.Download the Packet Capture and see how many of the questions you can answer from the attached packet capture. The answers are at the bottom of this […]
How does “Network Time” actually get to the UE?
Info on PyHSS new support for SCTP as well as TCP.
A look at MTU and its role in LTE and 5G Transmission.
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 […]
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 […]
Learning Huawei’s flavour of MML – Man Machine Language for the BTS 3900 series Macro Base Stations.
Picking and validating antenna selection for the new RAN project in my lab.
Using SDR hardware to view the LTE System Information Block’s contents.
Using Wireshark to view and analyze MAC layer LTE traffic
Multi-tenancy on the RAN side of the network, allowing an eNB to broadcast multiple PLMN IDs (MCC/MNC) in the System Information Block (SIB).
Configuring BaiCells Neutrino eNB
Using SRS LTE Stack with the BladeRF x40 Software Defined Radio (SDR)
How to encode and decode MCC and MNC as PLMN Identifiers
Using osmo-sim-auth to query USIM/SIM cards authentication mechanism.
Exploring the how and why of Authentication in LTE & NR networks.
Overview of the packet flow for a UE Idle detach from the network.
Periodic Tracking Area Update timer purpose
ARP in LTE is not the Ethernet standard for address resolution, but rather the Allocation and Retention Policy. A scenario may arise where on a congested cell another bearer is requested to be setup. The P-GW, S-GW or eNB have to make a decision to either drop an existing bearer, or to refuse the request […]
MBR stands for Maximum Bit Rate, and it defines the maximum rate traffic can flow between a UE and the network. It can be defined on several levels: MBR per Bearer This is the maximum bit rate per bearer, this rate can be exceeded but if it is exceeded it’s QoS (QCI) values for the […]