英语翻译Partial packet recovery schemes are protocols designed t
英语翻译
Partial packet recovery schemes are protocols designed to recover
packets that were received with errors.Data is divided into small
fragments,and some method is used to detect which fragments were
received correctly.The transmitter then only retransmits erroneous
fragments.Seda [8] adds an overhead of a CRC-8 and an identifier
to each block,and sends correction blocks alongside fresh blocks.
PPR [16] uses confidence information from the PHY layer instead of
a CRC to determine which bits need retransmission,and incorporates
a dynamic algorithm to determine what feedback should be sent by
the receiver.Maranello [12] again uses CRC to protect each block,
but reduces overhead by only transmitting CRCs when the packet
contains errors.
Partial packet recovery can be viewed as a finer-grained Type-
I HARQ:the PPR system sends smaller blocks,retransmitting a
block on error.The difference to non-PPR HARQ is the aggregation
of several blocks onto a single transmission,eliminating the fatesharing
of bits in the non-PPR case.