Xytrion — The Future of Mobile Cores is Here

Distributed, software-defined, and 3GPP generation agnostic. A converged core for LTE, 5G, and WiFi built on resilient Internet design patterns.

What are the Core Elements of Xytrion?

AGW

Access Gateway

Located at the network edge, providing local policy enforcement and terminating radio-specific protocols.

orc8r

Orchestrator

Centralized cloud controller providing secure configuration and monitoring via Northbound REST API.

FeG

Federation Gateway

Proxy for integration with existing MNO cores, facilitating authentication and charging.

How does Xytrion handle Modern Protocols?

Xytrion maintains 3GPP compliance at the edges while utilizing modern distributed systems protocols internally.

  • RAN-Specific: S1AP, 4G-NAS, NGAP, 5G-NAS, EAP.
  • Transport: gRPC over HTTP/2 for resilient long-distance coordination.
  • Interfaces: S6a, Gx, Gy, Gz (Diameter) via Federation Gateway.
  • Data Plane: Software-driven Open vSwitch (OVS) controlled by OpenFlow.

Architectural Mapping

Simplifying complexity by mapping 3GPP Network Functions to common abstractions.

Traditional Function Internal Abstraction
MME / AMF / RADIUS AAA Access Control & Management
HSS / UDM / AUSF Subscriber Management
PCRF / PCF Session & Policy Management
SGW / PGW / UPF Data Plane (OVS)

Integration & Deployment

Infrastructure Agnostic

Runs on commodity AMD64 or ARM64. Deploy on bare-metal, VMs, or Public/Private clouds via Kubernetes.

IMS Integration

Supports VoLTE/VoNR via external platforms like Kamailio or OpenSIPS for HD voice/video.

Automation & Obs

Orchestrated by Cloudstrapper and Juju. Full observability with Prometheus, Thanos, and Fluentd.

Converged Core & WiFi Support

Xytrion serves as a unified core for multiple radio technologies, allowing seamless integration of Carrier WiFi with cellular LTE and 5G.

WiFi

Carrier WiFi & Offload

Extend mobile services to indoor WiFi networks or perform Mobile Data Offload (MDO) to alleviate cellular congestion.

AGW

Unified Architecture

One platform for both cellular and WiFi deployments. Use LTE for wide-area coverage and WiFi hotspots for high-traffic indoor locations.

EAP

Protocol Mapping

Terminates EAP (WiFi) at the Access Gateway edge, mapping AAA functions onto the same internal abstractions used for LTE/5G.

Network Agnostic Management

By terminating access-specific protocols like EAP at the Access Gateway edge, Xytrion allows operators to manage WiFi users alongside cellular subscribers using the same centralized Orchestrator and Northbound API.

End-to-End Connectivity Diagram

A comprehensive look at the Xytrion signaling and data path from the MNO Core to the User Equipment.

Operator Core (External MNO) HSS / PCRF / OCS S6a, Gx, Gy, Gz Diameter / AAA Federation GW (FeG Bridge) Diameter/AAA ↔ gRPC Unified Translation gRPC Orchestrator (orc8r Control) Northbound: REST API Southbound: gRPC gRPC Access Gateway (AGW - Intelligent Edge) Converged Core Engine OVS Plane / L3 Proxy eth1 Network interface S1AP / NGAP AAA (EAP) eNodeB / gNB Cellular Access Wi-Fi AP Carrier Wi-Fi UE User Device

Frequently Asked Questions

Does Xytrion support connectivity over WiFi?

Xytrion supports connectivity over WiFi in addition to cellular LTE and 5G. It is designed to be access-network agnostic, allowing it to serve as a converged core for multiple radio technologies simultaneously.

Unified Architecture

Xytrion uses a single core network and management platform to handle both cellular and WiFi deployments. This allows an operator to, for example, use LTE for wide-area coverage while deploying WiFi hotspots in high-traffic indoor locations.

Carrier WiFi and Offload

A primary use case for Xytrion is Carrier WiFi, which allows traditional mobile operators to extend their services to indoor WiFi networks or perform Mobile Data Offload (MDO) to alleviate congestion on their cellular bands.

Protocol Mapping

While cellular networks use protocols like S1AP, Xytrion handles WiFi by mapping its specific functions—such as Authorization, Authentication, and Accounting (AAA)—onto the same internal abstractions used for LTE and 5G.

Deployment Scenarios

Xytrion has been used in production environments to provide backhaul for WiFi hotspots. In these setups, fixed wireless modems connect the WiFi access points to the internet via the Xytrion Access Gateway.

By terminating access-specific protocols like EAP (for WiFi) at the Access Gateway edge, Xytrion can manage WiFi users alongside cellular subscribers using the same centralized Orchestrator.

What is included from the HSS / UDM / AUSF list in Xytrion?

Xytrion does not implement the HSS, UDM, or AUSF as standalone, monolithic network functions in the traditional 3GPP sense. Instead, it refactors their functionalities into a unified internal service called Subscriber Management, which is primarily housed within the Access Gateway (AGW).

  • Representation via Internal Abstractions: Xytrion maps traditional 3GPP generation-specific functions onto a set of common internal abstractions. For LTE, the HSS is mapped directly to Subscriber Management. For 5G Standalone (SA), both UDM and AUSF functionalities are mapped to that same unified service.
  • Edge-Cloud Distribution: The Subscriber Management service runs locally on the AGW at the network edge. It manages the subscriber database, handles User Equipment (UE) authentication, and facilitates session establishment.
  • Local Caching & Resilience: A key feature is that the AGW caches subscriber profiles from the central Orchestrator. This allows it to authenticate and "attach" users even if the backhaul connection to the cloud is lost, ensuring operational continuity.

How does Xytrion connect to MNO/MVNO?

Xytrion provides a structured, multi-layer connectivity architecture to bridge modern distributed systems with traditional mobile operator cores.

1

OPERATOR CORE (External MNO)

The MNO core provides the master databases and charging logic including the HSS (Subscriber profiles), PCRF (Policy/QoS), and OCS (Real-time billing). Connection is established via standard 3GPP Interfaces (S6a, Gx, Gy).

2

FEDERATION GATEWAY (FeG) - The Bridge

Acts as a specialized proxy that terminates standard 3GPP protocols from the MNO core (S6a/Gx/Gy via Diameter) and translates them into internal gRPC messages for the Xytrion control plane.

3

ORCHESTRATOR (orc8r) - Central Control

A cloud-native brain (running in Kubernetes) that manages configuration and monitoring. It exposes a Northbound REST API for business integration and manages distributed AGWs via Southbound gRPC.

4

ACCESS GATEWAY (AGW) - The Intelligent Edge

Located at the cell site, it handles all local control and user plane traffic. It implements MME/AMF/SMF functions with local caching for resilience, using Open vSwitch (OVS) for high-performance data plane management.

5

RADIO ACCESS NETWORK (RAN) - Physical Layer

Hardware connectivity for 3GPP-compliant equipment (eNodeBs, gNodeBs) and Wi-Fi APs. It manages critical signalling interfaces: S1AP (LTE), NGAP (5G), and AAA (Wi-Fi) through the AGW's eth1 interface.