Arq May 2026

ARQ is an indispensable tool for achieving reliable digital communication. While Stop-and-Wait is efficient for simple, low-delay networks, Go-Back-N and Selective Repeat are essential for modern high-speed networks. The hybrid approach (HARQ) offers the best balance of efficiency and reliability in modern wireless scenarios.

The choice of ARQ protocol involves trade-offs between complexity and efficiency: ARQ is an indispensable tool for achieving reliable

The sender can transmit multiple frames (within a window size The choice of ARQ protocol involves trade-offs between

) before needing an ACK. If a frame is lost, the receiver discards all subsequent frames, and the sender must retransmit all frames starting from the lost one. Better utilization than Stop-and-Wait. Cons: High retransmission overhead in poor channels. 3.3. Selective Repeat ARQ (SR) Cons: High retransmission overhead in poor channels

The receiver sends an ACK to confirm the successful receipt of a packet.