HamLTE RLC

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HamLTE RLC protocol layer

There's three types of packet transfer. All packet sizes must be multiple of 8 bits. RLC buffers whole packets and only forms smaller pieces when the MAC layer informs how many bytes can be sent.

   | Transfer mode        | Headers      | Segm't | Order | ARQ | Logical channels
---+----------------------+--------------+--------+-------+-----+------------------------
TM | Transparent mode     | No headers   | No     | No    | No  | BCCH, DL/UL CCCH, PCCH
AM | Acknowledged mode    | RLC headers  | Yes    | Yes   | Yes | DL/UL DCCH, DL/UL DTCH
UM | Unacknowledged mode  | RLC headers  | Yes    | Yes   | No  | DL/UL DTCH, no ordering for MCCH, MTCH

Segm't: RLC provides segmentation to fit MAC transport blocks and reassembles when received

Order: On reception, packets must be delivered strictly in order and without duplicates

ARQ: Detected lost segments must be re-requested. If no ARQ is used, discard packet if not all segments have been received in a timely manner

Links

Physical, logical and transport channel names <http://www.radio-electronics.com/info/cellulartelecomms/lte-long-term-evolution/physical-logical-transport-channels.php>