Specifications & User Guidelines & Application Notes

The latest published reference version of the G3-ALLIANCE Specification is available on the ITU website: https://www.itu.int/rec/T-REC-G.9903.
Please note Amendment 1 includes the hybrid profile as Annex H of G.9903.   

Members with access rights can download the latest version of the G3-ALLIANCE Specification from this page.

User Guidelines

To help adopters properly integrate the G3-ALLIANCE protocol stack in products and systems a set of user guidelines has been developed. Several user guidelines are already available, others are still under development and will be published later.

User guidelines developed or under development so far are the following:


1. PLC introduction for non-experts

Executive Summary
This paper is an introductory document to the G3-ALLIANCE technology and precedes a series of user guidelines published by the G3-ALLIANCE Alliance, intended to help end-users and manufacturers in implementing and deploying G3-ALLIANCE products
In this document, the G3-ALLIANCE protocol stack and its main characteristics will be briefly presented as well as an introduction to the G3-ALLIANCE Alliance and its certification program.

The complete document is available for download here:

PLC introduction for Non Experts


2. Introduction to the Hybrid PLC+RF Profile

Executive Summary
This paper introduces the G3-Alliance Hybrid PLC+RF Profile which comes as an extension to the existing G3-ALLIANCE protocol stack. In this document, the main features and principles of the hybrid stack will be outlined.

G3-Alliance G3-Hybrid Introduction for non experts


3. Bootstrapping guidelines

Executive Summary
This paper reminds the principles of the bootstrapping mechanism, as described in G3-ALLIANCE Specifications, which applies for both G3-ALLIANCE and G3-Hybrid solutions. Yet, designing the way higher layers (a local data collection node – e.g. the data concentrator – and/or the Head-End System) interact with the bootstrapping procedure and the higher layers, which are out of scope of the G3-ALLIANCE Specifications, may affect general performances. Therefore, this document provides guidance to prevent implementers from encountering typical shortcomings.

The complete document is available for download here for members with access rights.


4. IPv6 route establishment guidelines

Executive Summary
By design the g3-alliance.communication stack allows native support of IPv6, which grants end-user flexibility to fulfill business requirements when choosing the appropriate higher layers (ISO/OSI transport and application layers). This key feature also secures G3-ALLIANCE infrastructures in the long term, thanks to the scalability and future application compatibility provided by IPv6

This document provides guidelines on how to make G3-ALLIANCE devices directly accessible over IPv6, by having one node acting as an IPv6 border router. In this document, we will assume that the border is the PAN-Coordinator, which is representative of the typical use case. This document will focus on unicast routing.

Optimisations are also proposed, allowing to reduce message size by using the full potential of the IPv6 header-compression mechanism.

In an annex, fundamental concepts related to IPv6 are reminded to provide some technical basics to the reader.

The complete document is available for download here for members with access rights.


5. Security guidelines

 under development


6. Attribute Usage guidelines

Executive Summary
G3-ALLIANCE provides a significant number of attributes which may be used to tweak the G3-ALLIANCE protocol stack behaviour to better fulfill specific use cases or to better match local particularities. Yet changing the value of an attribute or doing so for a combination of attributes can lead to sub-optimal performance and even malfunction. This document provides guidelines for the configuration of G3-ALLIANCE attributes covering physical, MAC and adaptation layers.

The complete document is available for download here for members with access rights.

2. 7. Upper layer integration with G3-ALLIANCE

Executive Summary
Using communication technologies designed for IoT, smart metering or command & control application use cases, such as low-data rate wireless or narrowband PLC technologies require some knowledge for proper integration with higher layers (network, transport and application layers in particular) to guarantee optimal performance.

This document provides guidelines making recommendations on the following aspects of the G3-ALLIANCE protocol stack integrated in a complete application profile:

– Managing a G3-ALLIANCE network for a PAN-Coordinator,
– Joining procedure for a PAN-Device,
– Route discovery and maintenance,
– Network access patterns,
– Upper layer protocols.

The complete document is available for download here for members with access rights.


8. Important considerations for G3-ALLIANCE certification

Executive Summary
This document provides some important considerations for G3-ALLIANCE Certification. The objective of this document is to make manufacturers aware of certain aspects related to the G3-ALLIANCE certification early in their product development process. When manufacturers are not aware of these aspects, it may lead to rework after the manufacturers came to the test laboratories for certification.

The complete document is available for download here for members with access rights.

Application notes


1. Connecting mains-powered single-hop G3 devices to a gateway

Executive Summary
For some use cases, it is desirable that so called single-hop G3 devices shall establish a direct connection to a specific gateway. This architecture is typical when connecting in-home displays located inside a single household, when connecting prepayment terminals or when connecting water, gas or other electricity meters to a specific gateway. The aim of this Application Note is to outline the mechanisms that need to be put in place to achieve the desired functionality in this architecture.


The complete document is available for download here for members with access rights.

2. Unidirectional Smart Meter to User Device Communication over G3-PLC

Executive Summary
CHAIN-2 is a unidirectional data communication system from smart meters to user devices, which is part of the standard smart meter architecture standardized by the Italian Electrotechnical Committee. This Application Note describes how CHAIN-2 communication between the smart meter and a User Device (UD) can be realized in a standard way over G3 technology to help end-users and manufacturers in implementing and deploying CHAIN-2 in G3 products.

The complete document is available for download here for members with access rights.