Requires complex buffering and ordering at the receiver. 4. Performance Considerations
The receiver sends an ACK to confirm the successful receipt of a packet. Requires complex buffering and ordering at the receiver
combines traditional ARQ with Forward Error Correction (FEC) . The receiver attempts to correct small errors using error-correcting codes; if the error is too great, a retransmission is requested. This approach, specifically Type-II Hybrid ARQ , provides a more efficient approach in poor radio conditions, optimizing throughput. 6. Conclusion combines traditional ARQ with Forward Error Correction (FEC)
The choice of ARQ protocol involves trade-offs between complexity and efficiency: if the error is too great
is a fundamental error-control mechanism used in telecommunications and data link layers to ensure reliable transmission over unreliable communication links. Unlike Forward Error Correction (FEC) , which allows the receiver to correct errors, ARQ relies on the receiver identifying errors and requesting retransmission of data from the sender. This paper covers the primary types of ARQ protocols, their mechanisms, and performance tradeoffs. 2. Fundamental Mechanisms ARQ protocols operate based on two main principles: