message. AAI_DREG-CMD This message is transmitted Idle Mode DREG-CMD by the BS to force the MS to Encrypted/ICV Operation Unicast change its Access State. This message is either unsolicited or in response to an AAI_DREG-REQ message. AAI_MC-ADV The BS broadcasts the Multi-carrier Multi-carrier system information on each Operation/Normal Broadcast Advertisement carrier with a specific format Operation and provides the MS with basic radio configuration for all available carriers supported in the cell through the AAI_MC-ADV message. This message is periodically broadcast by the BS and includes the multi-carrier mode and the configurations supported by the BS. The multi-carrier configuration information is relevant to all mobile stations in any multi- carrier modes or in the single carrier mode. (Continued) Table 6-8 IEEE 802. 16m MAC Management/Control Messages [1,2] Continued 802.16- IEEE 802.16m Standard MAC Management Equivalent Message Security Connection Message Description Usage Message Attributes AAI_MC-REQ The Multi-carrier Request Multi-carrier Multi-carrier Request Unicast Message is sent by an MS to Operation/Normal a BS to request the list of Operation Assigned Carriers. This message includes information about the MS supported multi-carrier configurations that is needed by the BS to assign carriers to the MS and to activate the carriers when needed. The MS cannot send the AAI_MC-REQ message until it receives the AAI_MC- ADV message from its serving BS. The AAI_MC-REQ message includes MS multi- carrier capability parameters for carrier assignment, list of candidate assigned carriers, and support of data transmission over guard sub- carrier. AAI_MC-RSP This message contains the Multi-carrier Unicast Multi-carrier BS response to the AAI_MC- Operation/Normal Response REQ message to provide the Operation MS with information about its assigned carriers including the following parameters: list of assigned carriers; support of data transmission over guard sub-carrier. While the AAI_MC-RSP message is typically sen