Categories
5G SA GSM IMS / VoLTE LTE Mobile Networks RFCs & Standards SDM

An intro to GSMA TAP3 Files

Getting to know the GSMA’s TAP files, what’s in them, and how they’re used to bill roaming traffic.

Categories
5G SA EUTRAN Mobile Networks RF

Inside a 32×32 MIMO Antenna

A peek under the radome of 32×32 5G Active Antenna Unit

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5G SA EPC IMS / VoLTE LTE Mobile Networks VoIP

Filtering for 3GPP DNS in Wireshark

Filtering for 3gppnetwork.org domains in Wireshark to make your troubleshooting easier

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5G SA IMS / VoLTE Kamailio LTE Mobile Networks VoIP

The Surprisingly Complicated World of SMS: Apple iPhone MT SMS

Quirks and gotchas of working with SMS on IMS on iPhones.

Categories
5G SA Mobile Networks RFCs & Standards SDM Security

Some thoughts on NRF Security in 5G Core

A look at attack vectors the NRF opens up in #5G Core networks, and the mitigations recommended by 3GPP.

Categories
5G SA Mobile Networks RFCs & Standards SDM

If you like Pina Coladas, and service the control plane – Intro to NRF in 5GC

Looking for Love in the 5G Core?

Let’s look at our matchmaker – The Network Repository Function in 5G Core.

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5G SA EPC LTE Mobile Networks SDM

Backing up and Restoring Open5GS

How to backup and restore Open5Gs config between servers

Categories
5G SA Mobile Networks

GTP Extension Headers (PDU session user plane protocol) in 5GC

How GTP is extended in 5G Core Networks to support extra QoS functionality like Reflective QoS and Delay Indicators

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5G SA Mobile Networks

Framed Routing in 5G

5GC includes native support for framed-routing.

Categories
5G SA Mobile Networks

Reflective QoS in 5G

A great new feature of #5G Core Networks is Reflective QoS – Where QoS of the traffic coming to a UE is reflected on the QoS coming out.

Categories
5G SA Mobile Networks

SMS in 5GC

The first SMS was sent in 1993, and all these years later as 5G rolls out, we’re still supporting it.

Categories
5G SA Mobile Networks RFCs & Standards

5G Online Charging with the Nchf_ConvergedCharging SBI

There’s no such thing as a free lunch, and 5G is the same – services running through a 5G Standalone core need to be billed. In 5G Core Networks, the SMF (Session Management Function) reaches out to the CHF (Charging Function) to perform online charging, via the Nchf_ConvergedCharging Service Based Interface (aka reference point). Like […]

Categories
5G SA Mobile Networks SDM

EIR in 5G Networks (N5g-eir_EquipmentIdentityCheck)

A look at the Equipment Identity Register in 5G Core

Categories
5G SA EPC Linux LTE Mobile Networks

Open5GS without NAT

Setting up Open5Gs without a NAT requirement, and the routing required to do so.

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 IMS / VoLTE LTE Mobile Networks SDM VoIP

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.

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 Mobile Networks RFCs & Standards

5Gethernet? – Transporting Non-IP data in 5G

A look at non-IP transport for 5G including Ethernet.

Categories
5G SA EPC LTE Mobile Networks SDM Software

Open5Gs Database Schema Change

New database time to support slicing and a migration path for existing users.

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.