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Table 3 Generic MAC header fields

From: New combined WiMAX/DSRC infrastructure design for efficient vehicular networking

Name Length (bits) Description
CI 1 CRC Indicator
   1 = CRC is appended to the end of the PDU
   0 = No CRC is used
CID 16 CID
EC 1 Encryption Control
   1 = Payload is encrypted
   0 = Payload is not encrypted
EKS 2 Encryption key sequence
ESF 1 Extended subheader
   1 = Using extended subheader
   0 = Extended subheader absent
HCS 8 Header check sequence
HT 1 Header type (use 0 for generic header)
   1 = Bandwidth request header
   0 = Generic MAC header
LEN 11 Length
  Length of the MAC PDU in bytes (including header and CRC, if used)
Rsv 1 Reserved for future use. Set to 0
Type 6 Flags to indicate the type of payload attached