Feedback Retransmission Grants for Unlicensed Spectrum Access
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Solution Overview
Problem
In wireless communication systems operating in unlicensed spectrum, feedback transmissions may be missed due to failed listen-before-talk procedures, leading to inefficiencies and increased latency in retransmissions.
Innovation Solution
A method is introduced where a wireless communication device receives a grant for retransmitting a missed feedback, allowing for an additional opportunity to transmit the feedback, thereby reducing latency and improving spectrum sharing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a listen-before-talk procedure is used to avoid collisions in unlicensed spectrum, then channel access reliability is improved, but transmission latency increases due to failed procedures
Solution Approach 1:
The system performs preliminary actions by sending a grant for feedback transmission before the actual feedback transmission occurs. This grant provides advance instructions including timing and resource allocation, so that when the feedback needs to be retransmitted after a failed LBT, the device can quickly act without additional negotiation delays
Solution Approach 2:
A grant message serves as an intermediary between the network device and the feedback transmission. The grant carries pre-configured instructions that mediate the interaction, allowing the terminal to autonomously handle retransmission timing and resources without requiring continuous network intervention, thus reducing latency while maintaining reliable access
2Productivity
If feedback transmission opportunities are provided in unlicensed spectrum, then communication efficiency is improved, but transmission reliability deteriorates due to missed opportunities
Solution Approach 1:
The system provides beforehand cushioning by sending a grant for feedback retransmission in advance, before the actual feedback transmission attempt. This grant acts as a safety cushion that ensures the terminal has pre-configured instructions for retransmission, compensating for potential LBT failures and ensuring feedback reliability without sacrificing communication efficiency
3Reliability
If multiple grants are communicated for feedback transmission and retransmission, then feedback reliability is improved, but signaling overhead increases
Solution Approach 1:
The system merges the feedback transmission grant and retransmission grant into a unified signaling mechanism. The second grant builds upon and extends the first grant, combining multiple functions (initial transmission authorization and retransmission authorization) into a coordinated signaling approach that improves reliability while minimizing redundant information
Data Source
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AI summary
Wireless communications systems and methods related to providing feedback for DL data are provided. A first wireless communication device communicates with a second wireless communication device, a first communication signal. The first wireless communication device communicates the second wireless communication device, a grant for retransmitting a feedback associated with the first communication signal. The first wireless communication device communicates with the second wireless communication device, the feedback based on the grant.