aggregately) through its dedicated type. uplink resource. Length (3 bits) indicates the length of the signaling header in bytes. BR Type (1 bit) indicates whether the requested bandwidth is incremental or aggregate. BR Size (19 bits) is the size of the requested bandwidth in bytes. BR FID (4 bits) is the FID for which uplink bandwidth is requested. Service This header is sent either by the MS Change or Specific FID (4 bits) and is set to 0b0001. through a dedicated uplink resource or acknowledge the Scheduling by the BS, which needs to change or Type (5 bits) is the MAC signaling header type. scheduling or QoS Control acknowledge the scheduling Length (3 bits) indicates the length of the signaling parameters header in bytes. parameters of its service flow. If the BR Type (1 bit) indicates whether the requested service-specific scheduling control header is sent by the MS, bandwidth bandwidth is incremental or aggregated. BR Size (19 bits) is the bandwidth request size in request type is included to indicate the bytes. incremental or aggregated nature of the BR FID (4 bits) is the FID of service flow for which request. It may further indicate uplink bandwidth is requested. (Continued) Table 6-5 IEEE 802. 16m Signaling Header Types, their Usage, and Parameters [2] Continued Signaling Header Type Description Usage Parameters adaptation request when it is sent for an QoS parameter change indicator (1 bit) indicates adaptive grant polling service flow. The whether there is a change in QoS parameters. BS may acknowledge or modify the SCID change indicator (1 bit). QoS parameters for adaptive grant Grant Polling Interval (GPI) (6 bits) indicates new polling service flow by sending the GPI (in number of frames) to use for future service-specific scheduling control allocations. header in the downlink, which indicates Minimum grant delay (6 bits) indicates minimum adaptation response. delay (in number of frames) of the requested grant. If the Sleep Cycle Identifier (SCID) change indicator is set to 1, the BS sends an acknow