G.HNEM: The New ITU-T Standard on
Narrowband PLC Technology
Narrowband power
line communications (NB-PLC) systems operating in the frequency
range 3–500 kHz were developed and used in the past few decades for
telecommunications, metering, control, and automation. Recently,
OFDM-based NB-PLC solutions known as G3 and PRIME came to the market
after a long monopoly of single-carrier technologies, offering
higher bit rates, robustness, and flexibility, which are vital for
smart grid applications. However, it was realized that an
international standard is important to ensure worldwide
interoperable products and avoid market fragmentation. In the
beginning of 2010, the IEEE Standards Association and ITU-T started
standardization of NB-PLC technologies based on OFDM, launching the
P1901.2 and G.hnem projects, respectively. This article gives a
technical overview of the ITU-T G.hnem standard, which defines a
unified NB-PLC OFDM-based technology targeting multiple smart grid
applications: smart metering, distributed automation, in-home energy
management, generic home automation, car charging, and others, using
IPv6 as the main networking protocol. ITU-T Recommendations G.9955 (G.hnem
physical layer) and G.9956 (G.hnem data link layer) were consented
for approval in February 2011; their final approval is expected in
December 2011.
Vladimir Oksman, Jin Zhang- IEEE
Power Networks: PLC (Power Line Carriers) - PLC MODEMS
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