No interference

The IEEE has approved an amendment to the IEEE 802.11 wireless local area network standard that avoids interference between IEEE 802.11a WLAN products and other systems operating in the 5 GHz bands used by IEEE 802.11a systems.

The Institute of Electrical and Electronics Engineers (IEEE) has approved an amendment to the IEEE 802.11 wireless local area network (WLAN) standard that avoids interference between IEEE 802.11a WLAN products and other systems operating in the 5 GHz bands used by IEEE 802.11a systems.

Systems that could be affected by IEEE 802.11a WLANs include radar and those for the Earth Exploration Satellite Service (EESS) and the Space Research Service (SRS).

‘IEEE 802.11h should help open the 5 GHz spectrum to WLANs in the many countries that have been concerned about the interference issues posed by wireless networks in this frequency band,’ said Stuart J. Kerry, Chairman of the IEEE P802.11 Standards Committee.

International Telecommunication Union (ITU) Radio Regulations call for WLANs and other devices to detect the presence of radars and EESS and SRS systems and then protect them from interference by selecting another operating channel or reducing transmit power. IEEE 802.11h creates a standard method to avoid interference so a manufacturer can create products that adhere to the ITU Radio Regulations and interoperate with similar products from other suppliers.

IEEE 802.11h amends the IEEE 802.11a PHY layer standard and the underlying IEEE 802.11 MAC layer standard to enhance network management and control extensions for spectrum and transmit power management in 5 GHz license exempt bands. It improves channel energy measurement and reporting, channel coverage in many regulatory domains, and dynamic channel selection and transmit power control mechanisms.

IEEE 802.11 standards form a family of specifications that define how WLAN equipment should be produced so equipment from different manufacturers can work together. The standards are developed by the IEEE 802.11 Working Group, which is sponsored by the IEEE 802 LAN/MAN Standards Committee of the IEEE Computer Society.