UE Relay Forwarding with Adaptive AF/DF Selection for mmWave Links
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently and reliably forwarding messages between user equipment (UE) and base stations, particularly in millimeter wave (mmW) frequency bands, due to limitations in amplify and forward (AF) and decode and forward (DF) transmission schemes, which affect the successful reception of messages at Next Generation NodeB (gNB).
Innovation Solution
The described techniques enable a UE to selectively use AF or DF transmission schemes based on decoding success, with options for re-encoding or amplifying messages, and transmitting an indication of the used scheme to the base station, allowing for improved message forwarding by considering thermal constraints, link budgets, and latency factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single transmission scheme (AF or DF) is used for message forwarding, then the system complexity is reduced, but the reliability of message reception at gNB deteriorates
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding outcomes. The relay UE transitions from a static single-scheme approach to a dynamic multi-scheme approach, selecting DF when decoding succeeds and AF when decoding fails, thereby adapting to varying channel conditions to maximize reception reliability
Solution Approach 2:
The system changes the transmission mode parameter dynamically based on decoding success. When the relay UE successfully decodes the received message, it switches to DF mode (re-encoding and forwarding); when decoding fails, it switches to AF mode (amplifying and forwarding the original signal). This parameter change allows the system to optimize reliability without permanent complexity increase
2Reliability
If decode and forward (DF) scheme is used, then message forwarding reliability is improved, but processing latency at the relay UE increases
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding outcomes. The relay UE transitions from a static single-scheme approach to a dynamic multi-scheme approach, selecting DF when decoding succeeds and AF when decoding fails, thereby adapting to varying channel conditions to maximize reception reliability
Solution Approach 2:
The system changes the transmission mode parameter dynamically based on decoding success. When the relay UE successfully decodes the received message, it switches to DF mode (re-encoding and forwarding); when decoding fails, it switches to AF mode (amplifying and forwarding the original signal). This parameter change allows the system to optimize reliability without permanent complexity increase
3Loss of time
If amplify and forward (AF) scheme is used, then processing latency is reduced, but message forwarding reliability deteriorates
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding outcomes. The relay UE transitions from a static single-scheme approach to a dynamic multi-scheme approach, selecting DF when decoding succeeds and AF when decoding fails, thereby adapting to varying channel conditions to maximize reception reliability
Solution Approach 2:
The system changes the transmission mode parameter dynamically based on decoding success. When the relay UE successfully decodes the received message, it switches to DF mode (re-encoding and forwarding); when decoding fails, it switches to AF mode (amplifying and forwarding the original signal). This parameter change allows the system to optimize reliability without permanent complexity increase
4Adaptability or versatility
If only one transmission scheme is implemented, then device complexity is reduced, but adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic selection between AF and DF transmission schemes based on real-time decoding outcomes. The relay UE transitions from a static single-scheme approach to a dynamic multi-scheme approach, selecting DF when decoding succeeds and AF when decoding fails, thereby adapting to varying channel conditions to maximize reception reliability
Solution Approach 2:
The system changes the transmission mode parameter dynamically based on decoding success. When the relay UE successfully decodes the received message, it switches to DF mode (re-encoding and forwarding); when decoding fails, it switches to AF mode (amplifying and forwarding the original signal). This parameter change allows the system to optimize reliability without permanent complexity increase
Data Source
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.