Nessum is a communication technology that can be used in a variety of media, including wired, wireless, and underwater, using high frequencies (kHz to MHz bands). It is standardized as IEEE P1901c.[1][2][3]

Overview

Nessum has two types of communication: wired (Nessum WIRE) and wireless (Nessum AIR).[4]

Wired communication

Nessum WIRE can be used for various types of lines such as power lines, twisted pair lines, coaxial cable lines, and telephone lines. The communication distance is about 100m to 200m[5] for power lines and 2,000m[6] for coaxial cables. In addition, when an automatic relay function called multi-hop (ITU-T G.9905) is utilized, a maximum of 10 stages of relay is possible. With a maximum physical speed of 1 Gbps and effective speeds ranging from several Mbps to several tens of Mbps, this technology is used to reduce network construction costs by utilizing existing lines,[7] to increase the speed of low-speed wired communication lines, to supplement wireless communication where it cannot reach, and to reduce the number of lines in equipment.[8][9]

Wireless communication

Short range wireless communication called Nessum AIR. It uses magnetic field communication in the short range, and the communication distance can be controlled in the range of a few centimeters to 100 centimeters. Maximum physical speed is 1 Gbps, with an effective speed of 100 Mbps.[10]

Technical overview

Physical layer (PHY)

The physical layer uses Wavelet OFDM (Wavelet Orthogonal Frequency Division Multiplexing). While a guard interval is required in ordinary OFDM systems, the Wavelet OFDM system eliminates the guard interval and increases the occupancy rate of the data portion, thereby achieving high efficiency. In addition, due to the bandwidth limitation of each subcarrier, the level of sidelobes is set low, which facilitates the formation of spectral notches. This minimizes interference with existing systems and allows for flexible compliance with frequency utilization regulations. Furthermore, Pulse-Amplitude Modulation (PAM) is used for each subcarrier, and the optimal number of modulation multi-levels is set according to the conditions of the transmission path, thereby improving transmission efficiency.[11] The frequency band used can be selected from among standardized patterns.[12]

The data link layer manages Quality of Service (QoS) and other control functions using control frames "beacons" broadcast periodically by the parent to all terminals in the network. The basic media access methods are Carrier-Sense Multiple Access with Collision Avoidance (CSMA/CA) and Dynamic Virtual Token Passing (DVTP), which dynamically assign transmission rights to terminals in the network and avoid collisions, The system uses a collision avoidance mechanism.[13]

History

This technology is based on HD-PLC, a type of power line communication developed by Panasonic in the early 2000s. HD-PLC was developed for room-to-room transmission of TV images at the time, but later began to be used not only for power lines but also for coaxial lines and twisted pair lines, and even for wireless communication. The name "power line communication" did not match the reality of the situation. In September 2023, Panasonic Holdings Corporation changed the name of HD-PLC to Nessum.[3] In October 2023, the HD-PLC Alliance was renamed the Nessum Alliance.[14]

See also

References

  1. ↑ "IEEE P1901c Standard for Broadband over Power Line Networks: Medium Access Control and Physical Layer Specifications Amendment 3: Enhanced Flexible Channel Wavelet (FCW) physical and media access control layers for use on any media". IEEE SA. Retrieved 2023-10-13.
  2. ↑ "IEEE 1901 Working Group". IEEE SA. Retrieved 2023-10-13.
  3. 1 2 "Panasonic Holdings' Technology Approved as a Technology Draft Standard for IEEE's Next-generation Communication Standard:Accelerating Global Development with a New Brand Name, Nessum". Panasonic Holdings Corporation. Retrieved 2023-10-13.
  4. ↑ "Nessum IP core". Panasonic Holdings Corporation. Retrieved 2023-10-20.
  5. ↑ "PLINE電力線通信タイプ". Toho Technology Corporation. Retrieved 2023-10-13.
  6. ↑ "Coaxial LAN converter". i-PRO. Retrieved 2023-10-20.
  7. ↑ "納入事例 名古屋大学 インターナショナル・レジデンス東山". Panasonic Corporation. Retrieved 2023-10-13.
  8. ↑ "DAIHEN 新型大気用ウエハ搬送ロボット UTX/W-RM5700". 株式会社ダイヘン公式Youtubeチャンネル. Retrieved 2023-10-13.
  9. ↑ "パナソニックのHD-PLCが「Nessum」へブランド変更。有線・無線両対応". PC Watch. Retrieved 2023-10-13.
  10. ↑ "What is Nessum?". Nessum Alliance. Retrieved 2023-10-20.
  11. ↑ "Nessum Technical Overview, Nessm PHY layer". Nessum Alliance. Retrieved 2023-10-20.
  12. ↑ "Nessum Latest Technology, Modes and channels". Nessum Alliance. Retrieved 2023-10-20.
  13. ↑ "Nessum Technical Overview, Nessum MAC layer". Nessum Alliance. Retrieved 2023-10-20.
  14. ↑ ""HD-PLC Alliance" is renamed "Nessum Alliance" as it enters a New Era of Wired and Wireless (Any Media) IoT Communication Applications!". businesswire. Retrieved 2023-10-13.
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