IEEE 1901


The IEEE Std 1901-2010 is a standard for high speed communication devices via electric power lines, often called broadband over power lines. The standard uses transmission frequencies below 100 MHz. This standard is usable by all classes of BPL devices, including BPL devices used for the connection to Internet access services as well as BPL devices used within buildings for local area networks, smart energy applications, transportation platforms, and other data distribution applications.
The IEEE Std 1901-2010 standard replaced a dozen previous powerline specifications. It includes a mandatory coexistence Inter-System Protocol. The IEEE 1901 ISP prevents interference when the different BPL implementations are operated within close proximity of one another.
To handle multiple devices attempting to use the line at the same time, IEEE Std 1901-2010 supports TDMA, but CSMA/CA is most commonly implemented by devices sold.
The 1901 standard is mandatory to initiate SAE J1772 electric vehicle DC charging and the sole powerline protocol for IEEE 1905.1 heterogeneous networking. It was highly recommended in the IEEE P1909.1 smart grid standards because those are primarily for control of AC devices, which by definition always have AC power connections - thus no additional connections are required.

Status

The IEEE P1901 Working Group started in June 2005.
More than 90 organizations contributed to the standard. Half of the organizations were from US, a quarter from Japan and the last quarter from Europe.
IEEE 1901 completed a formal standard IEEE Std 1901-2010 published in December 2010.
The working group which maintains and extends the standards is sponsored by the IEEE Power Line Communication Standard Committee.

Adoptions

ITU-T G.9972

The IEEE 1901 ISP coexistence protocol was extended to support the International Telecommunication Union's family of home networking standards known as G.hn, and adopted by the ITU-T as Recommendation ITU-T G.9972.

SGIP

The Smart Grid Interoperability Panel initiated by the U.S. National Institute of Standards and Technology mandates the implementation of the IEEE 1901 ISP coexistence mechanism in all technologies operating over power lines.
NISTIR 7862: Guideline for the Implementation of Coexistence for Broadband Power Line Communication Standards
The IEEE 1901 standard is included in the SGIP Catalog of Standards

DLNA

In 2012 the Digital Living Network Alliance announced it supported IEEE 1901 standards.

SAE and IEC 62196

The SAE J1772 and IEC 62196 standards for electric vehicle charging include IEEE 1901 as the standard for power line communication between the vehicle, off-board DC charging station, and the smart grid, without requiring an additional pin; SAE International and the IEEE Standards Association are sharing their draft standards related to the smart grid and vehicle electrification.

IEEE 1905.1

IEEE 1901 is the powerline communication standard supported by the IEEE 1905.1 Standard for a Convergent Digital Home Network.

Description

The 1901 standards include two different physical layers, one based on FFT orthogonal frequency-division multiplexing modulation and another based on wavelet OFDM modulation. Each PHY is optional, and implementers of the specification may, but are not required to, include both. The FFT PHY is derived from HomePlug AV technology and is deployed in HomePlug-based products. The Wavelet PHY is derived from HD-PLC technology and is deployed in HD-PLC-based products. It goes up to 1024-QAM.
The fast Fourier transform PHY includes a forward error correction scheme based on convolutional turbo code. The second option "Wavelet PHY" includes a mandatory FEC based on concatenated Reed-Solomon and Convolutional code, and an option to use Low-Density Parity-Check code.
On top of these two physical layers, two different Media Access Control layers were defined; one for In-home networking and the other for Internet access. Two MACs were needed because each application has different requirements.
To manage coexistence between PHYs and MACs the Inter-System Protocol was developed. ISP enables various BPL devices and systems to share communication resources when installed in a network with common electrical wiring. ISP allows 1901-compliant devices and ITU-T G.hn- compliant devices to co-exist. The protocol provides configurable frequency division for Access and time division for in-home with a granularity compatible with the Quality of Service requirements of the most demanding audio and video applications.
An amendment in 2019, IEEE 1901a-2019, defines a more flexible way of separating wavelet OFDM channels for Internet of Things applications.

Related standards

Another trade group called the HomeGrid Forum was formed in 2008 to promote the ITU-T home networking standards known as G.hn. Recommendation ITU-T G.9972 approved in June 2010, specifies a coexistence mechanism for home networking transceivers capable of operating over powerline wiring. This recommendation is based on IEEE 1901 ISP.
IEEE 1675 was approved in 2008. It provided testing and verification standards for the hardware commonly used for broadband over power line installations and standard installation methods to ensure compliance with applicable codes and standards.
Other IEEE standards sponsored by the Power line Communication Standards Committee:
The two standards below and their amendments are also written by the same committee. Despite the different bandwidths and frequencies addressed, they are based on similar technologies specialized to their main areas of use. All three include provisions for cryptographic security and authentication.
An IETF RFC Draft address the higher layers of the protocol, namely the specifics of passing IPv6 packets over the PHY and MAC layers of PLC systems like IEEE 1901. 6LoWPAN was previously used for this purpose, but it does not match the use case exactly.

Availability

The IEEE 1901 standards are promoted by trade groups such as the HomePlug Powerline Alliance and the HD-PLC Alliance.
Panasonic is a member of the HD-PLC Alliance, and licenses its patents and technologies that support IEEE 1901.
K-Micro announced a product in 2011.
The Qualcomm Hy-Fi networking marketing program combines IEEE 1901 with IEEE 802.11ad branded as Wi-Fi.
Because IEEE 1905 includes and requires IEEE 1901 compliance, it and the nVoy certification regime indicate 1901 compliance also. Generally consumers rely on the nVoy mark to show that the device supports IEEE 1901 gigabit networks.