LTE HARQ Type two (or II) (or 2) technique.
HARQ is Hybrid Automatic Repeat Request. Its an enhancement over Layer 2 ARQ protocol. These techniques are used to transfer data packets reliably over radio link. Lets discuss details for 4G LTE standard.
Type II HARQ is a complex but efficient technique to optimize Hybrid-
While computing the first packet for transmission a major part of IB is selected and a smaller part of FECB is added. So in good channel conditions the packet is self sufficient to be decoded and no retransmission is required and overhead due to FECB is avoided. Also during erroneous packet detection, a small set of remaining IB and large part of FECB is re-