CALM M5 is the ISO 21215 standard that incorporates WAVE (WAVE PHY/MAC is IEEE 802.11p standard) and adds the following features: Global (European) 5 GHz spectrum Regulatory domain (border) management Directivity and EMC control Regional DSRC cooperation Multiple radios/interfaces/antenna management through network connection GPRS/UMTS/+++ network interconnectivity
See also IEEE 802.11p
References
Status of Project IEEE 802.11p Bob Williams, Intelligent Transport Systems Standards, p. 221, Artech House, 2008 . Piyushimita (Vonu) Thakuriah, D. Glenn Geers, Transportation and Information: Trends in Technology and Policy, p. 24, Springer, 2013 .