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

The sender can transmit multiple frames (within a window size Automatic Repeat Request (ARQ): Reliable Data Transmission 1

SR provides the best throughput in high-error rate scenarios. Automatic Repeat Request (ARQ): Reliable Data Transmission 1

The receiver sends an ACK to confirm the successful receipt of a packet. Automatic Repeat Request (ARQ): Reliable Data Transmission 1

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:

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