Confirmation Code for the corresponding AAI_DSD-REQ message. In response to an AAI_DSD-REQ message which contains SCID, the SCID may be included in the AAI_DSD-RSP message to accept the base station or mobile station's request. If the AAI_DSD-RSP message does not include SCID, the MS assumes that its request has failed. To support Emergency Telecommunications Service (ETS) xiii and E-911, xiv the emergency service flows are given priority in admission control over the regular service flows. The default service flow parameters are defined for emergency service flows. The BS grants resources response to an emergency service notification from the MS without going through the complete service flow set-up procedures. The MS can include an emergency service notification in initial ranging or service flow set-up requests. If a service provider wishes to support National Security/ Emergency Preparedness (NS/EP) priority services, the BS would use the procedures defined by the home country regulatory body. For example, in the United States, the procedure defined by the FCC in Hard Public Use Reservation by Departure Allocation (H-PURDA) is used to support NS/EP. 6.9 MOBILITY AND POWER MANAGEMENT The MS power conservation during normal operation is crucial to mobile user connectivity. The IEEE 802.16n provides MS power management functions including sleep and idle mode procedures to minimize MS power consumption. xil'The Emergency Telecommunications Service (ITU.ETS.E106) is a successor to and generalization of two services used in the United States: Multi-Level Precedence and Pre-emption (MLPP), and the Government Emergency Telecommuni- cation Service (GETS). Services based on these models are also used in a variety of countries throughout the world, both Public Switched Telephone Network (PSTN) and Global System for Mobile Communications (GSM)-based. Both of these services are designed to enable an authorized user to obtain service from the telephone network in times of crisis. They differ primarily in the mechanisms use