Liaison statement
Title: LS/r on creation of IETF GREEN working group (reply to IETFGreen-LS1)

This liaison statement replies to IETFGreen-LS1
ITU-T Study Group 5 would like to acknowledge receipt of the liaison
IETFGreen-LS1 informing about the creation of the IETF Getting Ready for
Energy-Efficient Networking (GREEN) WG and the related work planning. From the
provided work planning, ITU-T Study Group 5 can see that we have several common
topics and interests. Consequently, ITU-T Study Group 5 would be happy to
collaborate with IETF GREEN WG on related topics. In this respect, ITU-T Study
Group 5 would like to inform IETF GREEN WG that it has developed, and is
continuing to develop, a series of Recommendations, Technical Reports and
Supplements related to the energy efficiency assessment and optimization in
telecommunications/ICTs. These Recommendations are available at:
http://www.itu.int/ITU-T/recommendations/index_sg.aspx?sg=5 In particular,
ITU-T Study Group 5 believes that the L.1300 series of Recommendations will be
of interest to IETF GREEN WG; examples include the following Recommendations,
with terminology, metrics, assessment methodologies, and so on: –       ITU-T
L.1310: “Energy efficiency metrics and measurement methods for
telecommunication equipment”. –       ITU-T L.1315: “Standardization terms and
trends in energy efficiency”. –       ITU-T L.1316: “Energy efficiency
framework”. –       ITU-T L.1330: “Energy efficiency measurement and metrics
for telecommunication networks”. –       ITU-T L.1331: “Assessment of mobile
network energy efficiency”. –       ITU-T L:1333: “Carbon data intensity for
network energy performance monitoring”. –       ITU-T L.1361: “Measurement
method for energy efficiency of network functions virtualization”. –      
ITU-T L.1362: “Power management capabilities of the future energy
telecommunication network nodes – Enhanced interface for power management in
network function virtualization environments”. Furthermore, the following work
items that are being consented in the present meeting (Geneva, 3–12 June 2025)
may be of interest for your work as they can be implemented using the JSON or
YANG models developed by IETF: –       ITU-T L.1395 (ex. L.MCI_Gen):
“Monitoring and Control Interface for Infrastructure Equipment (Power, Cooling
and Building Environment Systems used in Telecommunication Networks) - Generic
Interface”. –       ITU-T L.1396 (ex.L.MCI_MIM): “Monitoring and Control
Interface for Infrastructure Equipment (Power, Cooling and Building Environment
Systems used in Telecommunication Networks) - ICT equipment power, energy and
environmental parameters monitoring information model”. In addition, ITU-T
Study Group 5 also believes that the ongoing Study Group 5 work item ITU-T
L.FNEE “Assessment of Fixed Network Energy Efficiency” could be relevant for
IETF GREEN WG. This work item develops a definition and an assessment method of
network-level energy efficiency for the end-to-end fixed network, including
network side equipment of access network, transport network and IP network.
ITU-T Study Group 5 looks forward to continued information exchange and
potential collaboration with IETF GREEN WG on these important matters and
kindly asks to be kept informed of future developments in this respect.