Dual-Encoding Relay Retransmission for Latency Reduction
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Solution Overview
Problem
Communication systems that use signal forwarding devices, such as repeaters and relays, experience delays due to additional processing and waiting for retransmissions, as they encode and decode data before transmitting to destination devices, which can lead to inefficiencies in data delivery.
Innovation Solution
Implementing a dual-encoding method where the signal forwarding device receives dual-encoded data, decodes it using specific parameters, and retransmits the single-encoded data without waiting for the origination device, allowing for immediate retransmission of packets that were not successfully received by the destination device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal forwarding device performs decode and forward processing, then the data can be successfully transmitted through challenging channels, but additional decoding and encoding delays are introduced
Solution Approach 1:
The data is encoded twice before transmission: first with encoding parameters optimized for the first communication link (origination to forwarding), and second with encoding parameters optimized for the second communication link (forwarding to destination). This preliminary dual-encoding action allows the forwarding device to simply forward the pre-encoded data without performing decoding operations, thereby maintaining transmission reliability while eliminating processing delays.
2Reliability
If the signal forwarding device waits for retransmission requests before retransmitting data, then retransmission accuracy is improved, but latency increases due to waiting time
Solution Approach 1:
The forwarding device stores the dually-encoded data in memory immediately after receiving it from the origination device, before any transmission or potential retransmission requests. When a retransmission is needed, the device can immediately retrieve and forward the pre-encoded data from memory without waiting for requests or performing new encoding operations, thus reducing retransmission latency while maintaining accuracy.
3Reliability
If the signal forwarding device performs complete decoding before forwarding, then the forwarded signal quality is improved, but the processing complexity and time increase
Solution Approach 1:
The data undergoes complete decoding and re-encoding at the origination device before transmission to the forwarding device. The forwarding device only needs to perform simple buffer storage and forwarding operations, dramatically reducing its processing complexity while the pre-encoded data maintains high signal quality through the dual-encoding process performed at the origination device.
Data Source
AI summary
A signal forwarding device receives a dual-encoded first set of data that is encoded according to first and second sets of encoding parameters. The signal forwarding device decodes the dual-encoded first set of data, using decoding parameters that correspond to the second set of encoding parameters, to generate a single-encoded first set of data that is encoded according to the first set of encoding parameters. The signal forwarding device transmits the single-encoded first set of data to the destination device, which decodes the single-encoded first set of data using decoding parameters that correspond to the first set of encoding parameters. If the decoding is unsuccessful, the destination device requests retransmission. The signal forwarding device decodes a stored copy of the single encoded first set of data, using decoding parameters that correspond to the first set of encoding parameters, and retransmits the first set of data to the destination device.