Relay Node Pre-Decode Signaling for Latency Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently relaying packets with pre-decoded information, leading to increased processing time and latency, particularly in multi-access technologies like LTE and NR, where decoding delays hinder faster data transmission.
Innovation Solution
Implementing a method where relay nodes transmit pre-decoded samples, such as log-likelihood ratios, along with an indication to the receiving nodes, allowing them to decode the packets more efficiently, thereby reducing latency and enhancing data relay speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If relay nodes transmit packets requiring full decoding at the destination, then decoding accuracy is maintained, but relaying latency increases
Solution Approach 1:
The relay node performs preliminary decoding operations to generate pre-decoded samples (LLRs) before forwarding the packet to the destination node. This preliminary action allows the destination to skip or reduce its decoding workload, directly reducing relaying latency while maintaining decoding accuracy through the use of pre-processed decoding information
2Reliability
If relay nodes perform full decoding before relaying, then decoding accuracy is improved, but processing time increases
Solution Approach 1:
The relay node performs a partial decoding operation to generate pre-decoded samples (log-likelihood ratios) rather than completing the full decoding process. This partial action maintains sufficient decoding accuracy for the destination node to successfully decode the original packet, while significantly reducing the processing time at the relay node
3Productivity
If relay nodes transmit pre-decoded samples, then relaying speed increases, but information format complexity increases
Solution Approach 1:
The relay node changes the parameter representation of the decoded information by generating pre-decoded samples in the form of log-likelihood ratios (LLRs) instead of complete decoded bits. This parameter transformation enables faster transmission and processing at the destination while maintaining a standardized format that is compatible with existing decoding algorithms through parameter adaptation
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for signaling that relayed packets include information generated prior to decoding (e.g., pre-decoded samples, such as log-likelihood ratios (LLRs)). A method that may be performed by a first wireless node (e.g., a relay node such as a repeater user equipment (UE), a network entity such as an access point (AP), base station (BS) or next generation NodeB (gNB), or another node) includes determining at least one first packet to be transmitted to a second node includes pre-decoded first information about a second packet and providing an indication to the second node that the first packet includes pre-decoded first information.