Multi-Carrier Downlink Feedback Schemes for Lower Latency
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in throughput due to latency in feedback processes in carrier aggregation (CA) and dual connectivity (DC) networks, particularly in managing feedback across different component carriers, leading to gaps in scheduling and reduced efficiency.
Innovation Solution
Implementing separate feedback schemes for different groups and subgroups of carriers, including feedback-less and feedback-based retransmissions, to optimize feedback processes and reduce overhead, with decisions based on packet importance and delay sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a unified feedback scheme is used across all component carriers, then implementation complexity is reduced, but throughput is limited due to feedback process latency and overhead
Solution Approach 1:
The patent segments component carriers into different groups (first group with first feedback scheme, second group with second feedback scheme) based on their feedback requirements. This segmentation allows each group to use an optimized feedback scheme tailored to its specific needs, thereby improving overall throughput while managing complexity through structured organization of carriers into manageable groups with distinct feedback mechanisms.
2Reliability
If feedback is transmitted for all downlink carriers, then reliability is improved, but overhead increases and efficiency decreases
Solution Approach 1:
The patent applies local quality by assigning different feedback schemes to different groups of component carriers based on their specific requirements. The first group uses a first feedback scheme while the second group uses a second feedback scheme, allowing each carrier group to have the appropriate level of feedback reliability without unnecessarily increasing overhead across all carriers. This localized approach ensures reliability where needed while minimizing overhead elsewhere.
3Reliability
If feedback processes are maintained for all carriers, then communication reliability is improved, but feedback process latency increases
Solution Approach 1:
The patent implements dynamics by enabling flexible switching between different feedback schemes for different carrier groups. The system can dynamically allocate carriers to different feedback schemes based on current communication conditions, allowing it to reduce feedback latency for time-sensitive carriers while maintaining reliability for carriers that require more robust feedback processes. This dynamic allocation optimizes the balance between reliability and latency.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of a first set of downlink carriers and a second set of downlink carriers including multiple subsets. The UE may receive a message from a network entity via a first subset, and may transmit a feedback message to a second network entity via an anchor carrier of the first set for relaying to the network entity. The UE may also receive one or more second messages via a second subset, and may apply a second feedback scheme, where a feedback process duration associated with the second feedback scheme may be less than that of the first feedback scheme. Applying the second feedback scheme may involve monitoring for one or more retransmissions of the second message, or transmitting one or more feedback messages via an anchor carrier of the second set.