e features and configuration parameters included in the baseline capability class are sufficient to meet the minimum performance requirements of the standard. In case of failure in any stages of operation, the MS and BS fall back to "Capability Class 0" and restart negotiations for a new "Capability Class," if necessary. AAI_PKM-REQ This message is sent by the Network Entry/ PKM-REQ Prior to derivation of Unicast Privacy Key PKM client (MS) to PKM Re-entry AK in network entry: Management server (BS). PKMv3 uses NULL. Request AAI_PKM-REQ and Following derivation AAI_PKM-RSP MAC of AK in network management messages. entry and when Each message encapsulates EAP-Transfer one PKM message in the message is MAC control message enclosed: payload. They are transmitted Encrypted/ICV. through unicast primary Following derivation management connection. of AK in network The PKM protocol messages entry and when contain the following other messages are parameters: Code (i.e., the enclosed: CMAC. (Continued) Table 6-8 IEEE 802. 16m MAC Management/Contro Messages [1,2] Continued 802.16- IEEE 802.16m Standard MAC Management Equivalent Security Connection Message Message Description Usage Message Attributes type of PKM packet), PKM Identifier to match a BS response to the MS requests or an MS response to the BS requests. For retransmissions, the identifier field remains unchanged. AAI_PKM-RSP This message is sent by the Network Entry/ PKM-RSP Prior to derivation of Unicast Privacy Key PKM server (BS) to PKM client Re-entry AK in network entry: Management (MS). PKMv3 uses AAI_PKM- NULL. Response REQ and AAI_PKM-RSP Following derivation MAC management of AK in network messages. Each message entry and when encapsulates one PKM EAP-Transfer message in the MAC control message is message payload. They are enclosed: transmitted through a unicast Encrypted/ICV. primary management Following derivation connection. The PKM of AK in network protocol messages contain entry and when the following parameters: other messages are Code (i.e., the ty