IEEE Standards AssociationIEEE 802.21™: MEDIA INDEPENDENT HANDOVER SERVICES
IEEE 802.21™-2008 
IEEE Standard for Local and metropolitan area networks - Part 21: Media Independent Handover Services
IEEE 802.21a™-2012 IEEE Standard for Local and Metropolitan Area Networks: Media Independent Handover Services - Amendment for Security Extensions to Media Independent Handover Services and Protocol
IEEE 802.21b™-2012 IEEE Standard for Local and metropolitan area networks - Part 21: Media Independent Handover Services Amendment 2: Extension for Supporting Handovers with Downlink Only Technologies
