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 ISBN 9781596932913. Piyushimita (Vonu) Thakuriah, D. Glenn Geers, Transportation and Information: Trends in Technology and Policy, p. 24, Springer, 2013 ISBN 9781461471295.