arge PDUs. PDU. The length field in AGMH is the 11 least than 2047 bytes. The MLEH would significant bits of extended length of MAC PDU. be the first extended header in the MAC PDU. ARQ Feedback This header is used by an ARQ ARQ feedback ARQ feedback information elements. Extended Header receiver to signal positive or (AFEH) negative acknowledgement. Rearrangement The RFPEH is used for ARQ ARQ feedback for FC (2 bits) fragmentation control bits (see Table 6-2). Fragmentation and enabled transport connections and fragmented/packed SN (10 bits) is maintained per connection and Packing Extended is included in MAC PDU with MAC PDUs represents the ARQ block sequence number. The Header (RFPEH) AGMH, if the MAC PDU payload SN value increments by one (modulo 1024) for each contains an ARQ sub-block which is MAC PDU. constructed from SDU(s) or SDU SSN (11 bits) is the SUB-SN of the first ARQ sub- fragment(s) or both are packed. block. LSI (1 bit) is the last ARQ sub-block indicator, indicating the last ARQ sub-block from the single ARQ block is not included in this MAC PDU or the last ARQ sub-block from the single ARQ block is included in this MAC PDU. PI (1 bit) is the Packing Indicator, indicating packing information is not present in the RFPEH or packing information is present in RFPEH. Length (11 bits) is the length of MAC SDU or MAC SDU fragment in a MAC PDU. If a MAC PDU consists of N MAC SDU/ MAC SDU fragments, N - 1 length fields are present to indicate the length of MAC SDU/ MAC SDU fragments 1 to N - 1. ARQ Feedback This header is used by an ARQ ARQ feedback Reference FID for ARQ feedback polling Polling Extended transmitter to poll ARQ feedback. Header (APEH) 6.3 MAC signaling headers Table 6-2 Fragmentation Control Information [2] Description Usage The first byte of data in the MAC PDU is the One or multiple MAC SDUs are packed in first byte of a MAC SDU. The last byte of data a MAC PDU. in the MAC PDU payload is the last byte of a MAC SDU. The first byte of data in the MAC PDU is the A MAC PDU with only the f