ng preamble indices. Once the RS is informed of the monitoring scheme, the BS does not change the frame configuration of the super-ordinate station of the RS before the RS enters the Operational State. The RS utilizes the neighbor measurement mechanisms that are specified in the standard [10]. The RS then sends the measurements to the BS using the relay neighbor measurement The relay link channel descriptor defines the characteristics of the relay link between an RS and its super-ordinate station. The channel descriptor is transmitted to subordinate relay stations using the RS primary management CID or multicast management CID on an event-driven basis when one of the parameters relating to the characteristics of the relay link changes [10]. CHAPTER 4 IEEE 802.1 16m System Operation and State Diagrams Power ON/OFF Power Down Scanning and DL Synchronization From Accessor Operational State Primary and Secondary Superframe Header To Access State Acquisition Access Station Selection Failed Operation Path Normal Operation Path FIGURE 4-18 Procedures in the initialization state of an IEEE 802.16m relay report. This measurement report is used by the BS during the second stage access station selection to select a new access station (or to continue with the current access station). The BS may assign to the RS a preamble index based on the report from the RS. During this phase, the BS determines the RS operational parameters and sends a relay link channel descriptor to inform the RS of the relay link characteristics and configures the parameters at the RS. The RS configuration message contains all information that is required for the RS to transition to the Operational State, as well as parameters for proper RS operation. The remaining steps prior to transition to the Operational State for different RS types are as follows: A time-division transmit and receive RS detects and decodes the relay zone control channels using the relay configuration message sent by the BS. A transparent or simultaneous transmit and receive RS rec