For HARQ, hop-by-hop and edge-to-edge methods are used;for ARQ, besides edge-to-edge and hop-by-hop, the last hop guarantee mechanism is also applied.

• 其中针对HARQ提出了逐跳和端到端两种方法，而对于ARQ功能除了逐跳和端到端两种方法外还增加了最后一跳的保障机制。