Using Android’s development features to allow remote control of a UE in the field for testing the cellular network.
Tag: LTE
If you’ve ever received an SMS from your operator, and the sender was the Operator name for example, you may be left wondering how it’s done. In IMS you’d think this could be quite simple – You’d set the From header to be the name rather than the MSISDN, but for most SMSoIP deployments, the […]
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 […]
Quirks and gotchas of working with SMS on IMS on iPhones.
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Huawei Baseband Cheat Sheet
Quick reference guide for the types and capacities of Huawei BBU 3900 Series cards
A look at how Dedicated Bearers get established for VoLTE.
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Backing up and Restoring Open5GS
How to backup and restore Open5Gs config between servers
A glimpse into the complexities of prepaid billing (Online Charging) Diameter based networks.
A look at how the HSS can update the profile of an already in-use subscription using Insert Subscriber Data Request/Response.
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PS Data Off
How turning mobile data off, doesn’t, in LTE and 5G.
As the number of Private Networks built on LTE and 5G grow, how will PLMN allocation be managed?
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How UEs get Time in LTE
How does “Network Time” actually get to the UE?
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IMS Routing with iFCs
Peer behind the magic curtain at how IMS networks route your VoLTE and VoNR calls, and how iFC (Initial Filter Criteria) achieve this.
5G introduces Network Slicing, or does it? A look at slicing mechanisms widely used in pre-5G networks.
Short messaging can be anything but simple…
New database time to support slicing and a migration path for existing users.
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PyHSS Update – SCTP Support
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 […]
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Cell Broadcast in LTE
A look at how Cell Broadcast is signalling implemented between the MME and CBC in an LTE/EPC network.