UE Relay Forwarding With Adaptive AF/DF for mmWave Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently and reliably transmitting messages between user equipment (UE) and base stations, particularly in millimeter wave (mmW) frequency range 2 (FR2) due to limitations in amplify and forward (AF) and decode and forward (DF) transmission schemes, which affect the successful reception of forwarded messages.
Innovation Solution
User equipment (UE) selectively employs AF, DF, or a combination of both transmission schemes based on decoding success, using cyclic redundancy check (CRC) codes and I/Q amplitude imbalance correction to forward sidelink messages to a base station, while the base station utilizes improved decoding techniques and log-likelihood radio (LLR) combining to enhance message reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amplify and forward (AF) transmission scheme is used, then message forwarding is achieved, but thermal constraints and power availability limitations reduce successful reception likelihood
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding success determination. The relay UE adapts its transmission mode by attempting to decode the received message and selecting AF if decoding fails or DF if decoding succeeds, optimizing the balance between power consumption and reception reliability under thermal and power constraints.
2Reliability
If decode and forward (DF) transmission scheme is used, then message reliability is improved, but latency at UE and gNB increases
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding success determination. The relay UE adapts its transmission mode by attempting to decode the received message and selecting AF if decoding fails or DF if decoding succeeds, optimizing the balance between power consumption and reception reliability under thermal and power constraints.
3Reliability
If single transmission scheme (AF or DF) is used, then system complexity is reduced, but message forwarding reliability is limited
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding success determination. The relay UE adapts its transmission mode by attempting to decode the received message and selecting AF if decoding fails or DF if decoding succeeds, optimizing the balance between power consumption and reception reliability under thermal and power constraints.
Solution Approach 2:
The patent changes the transmission scheme parameter dynamically based on decoding success. The system transitions between two distinct operational modes (AF and DF) by evaluating the decoding outcome, allowing optimal message forwarding reliability without requiring complex multi-scheme combinations.
4Productivity
If adaptive transmission scheme selection is implemented, then communication efficiency and reliability are improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding success determination. The relay UE adapts its transmission mode by attempting to decode the received message and selecting AF if decoding fails or DF if decoding succeeds, optimizing the balance between power consumption and reception reliability under thermal and power constraints.
Solution Approach 2:
The patent employs feedback mechanisms where the relay UE determines decoding success and uses this information to select the appropriate transmission scheme. The base station also provides feedback through improved decoding techniques and LLR combining, creating a closed-loop system that enhances communication efficiency while managing device complexity through intelligent adaptation.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described that allow for a first user equipment (UE) to forward a transmission from a second UE to a base station. The forwarding techniques may include the first UE performing a decoding procedure on a message received from the second UE via a sidelink communications link. Based on the results of the decoding procedure, the first UE may select an amplify and forward (AF), decode and forward (DF), or a combination thereof to forward the message from the second UE to the base station. The base station may receive the forward messages and, in some cases, a message directly from the second UE, and may determine decoding weights to use to jointly decode the two messages received at the base station.