window. If the BS receives a bandwidth request from the MS on its primary carrier during the listening window, it considers the possibility of data transmission on all active carriers. During the sleep window, the MS may transmit a bandwidth request on the primary carrier on availability of uplink data. In that case, the serving BS may schedule an uplink transmission on all active carriers that have already been assigned to the MS. The MS resumes the normal sleep cycle after completion of the uplink transmission. Note that the sleep cycle parameters are applied to all active carriers of the MS, and downlink/uplink transmissions on all active carriers are suspended during the sleep window. The idle mode procedures are similar in single-carrier and multi-carrier operation. In the multi- carrier mode, the PGID_Info message is transmitted on all fully-configured carriers. The AAI_PAG- ADV message is only transmitted on one of the fully-configured carriers. While in the idle mode, the MS determines the carrier index for monitoring the paging message within the paging listening interval as follows: Paging Carrier Index = (DID mod N), where N denotes the number of carriers per PGID that are used for conveying paging messages for idle-mode mobile stations. The paging carrier index corresponds to the physical carrier index of the carriers used for transmission of the paging message. paging carrier indication flag is used to identify a paging carrier. The paging carrier indication flags of different carriers are included in the PGID_Info message and may be further included in an AAI_NBR-ADV or AAI_MC-ADV messages. The AAI_PAG-ADV message is transmitted in one or multiple frames starting from the second subframe in the superframe. For an MS with multicast and broadcast capability, the AAI_PAG-ADV message may be transmitted on the E-MBS dedicated carrier. An MS may perform a location update to acquire its preferred carrier during idle mode, if it cannot find the paging carrier. When carriers have different coverage areas, th