Arq (High-Quality)

Automatic Repeat Request (ARQ): Reliable Data Transmission 1. Introduction

An Adaptive Type-I1 hybrid ARQ/FEC Protocol - Clemson University

The choice of ARQ protocol involves trade-offs between complexity and efficiency: Automatic Repeat Request (ARQ): Reliable Data Transmission 1

If the sender does not receive an ACK within a designated time (timeout) or receives a NAK, it retransmits the packet. 3. Types of ARQ Protocols 3.1. Stop-and-Wait ARQ

The sender can transmit multiple frames (within a window size Types of ARQ Protocols 3

g., protocol efficiency calculations, equations) or a ? Do youg., mobile networks, satellite)?

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) 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)