ctivated. The BR Acknowledgement (BR-ACK) A-MAP IE indicates the decoding status of the BR opportunities in the previous UL frame. All the successfully received preamble sequences are acknowledged in ascending order. In addition, the BR-ACK A-MAP IE also includes the allocation information for the fixed-sized BR header. The UL resource and HARQ feedback are allocated to the preamble sequences whose grant indicator is set. The allocations are ordered based on the index of preamble sequences. The standalone bandwidth request header is used by the MS to send bandwidth request in step 3 of the five-step contention-based random access, or as a response to the polling from the serving BS. The MS can use any UL resource allocated to it to send the standalone BR header. The piggybacked bandwidth request is used by the MS to request bandwidth for the same or a different connection into which the user data in the MAC PDU is mapped. The bandwidth request message can also be sent from an MS to the BS using the primary fast-feedback channel. When a three-step BW- REQ procedure is used, the quick access message sent in step 1 carries 12 bits of information, including the MS addressing information with quick access sequences carrying additional 4-bit REQ information. The following parameters are carried in step 1 of a three-step BW-REQ procedure: STID of the MS (12 bits); Predefined BR Index (4 bits): the mapping between the predefined BR index and BR size/QoS level is done during DSx procedure. The BR size/QoS level is determined based on the QoS parameters of the flow in the DSx messages. The BR size is in units of bytes and is mapped to the Maximum Traffic Burst parameter, and QoS level is mapped to the UL Grant Scheduling Type parameter. 6.12 Multi-radio coexistence When the standalone bandwidth request header is transmitted in step 3 of the five-step contention- based random access BR procedure, it includes the following parameters: STID of the MS; FID of the requesting connection; Aggregate bandwidth request. When the sta