Uplink Feedback Time Window for Unlicensed Spectrum HARQ
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Solution Overview
Problem
Traditional wireless communication systems face limitations in flexibility due to timing constraints between data transmission and feedback in HARQ mechanisms, especially in new generation wireless cellular systems and unlicensed spectra, where channel availability is uncertain.
Innovation Solution
An uplink feedback method that allows terminals to transmit feedback information within a configured time window, which includes multiple transmission units, enabling flexible selection and configuration based on practical requirements, and ensuring channel availability for normal communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed timing relation between data transmission and feedback is used in traditional LTE systems, then the processing capability requirement is met, but the flexibility of data communication is limited
Solution Approach 1:
The patent applies the dynamics principle by changing the fixed timing relation into a flexible time window mechanism. Instead of requiring feedback at a specific fixed time after data transmission, the system allows feedback within a configurable time window that can be dynamically adjusted based on channel availability and processing requirements. This resolves the contradiction by providing adaptability while maintaining manageable complexity through configuration rather than complex dynamic calculation.
Solution Approach 2:
The patent changes the parameter from a fixed timing relation to a configurable time window duration. By allowing the time window parameter to be adjusted based on different communication scenarios and channel conditions, the system achieves greater flexibility without requiring fundamentally complex new mechanisms. The parameter change enables the system to adapt to varying processing capabilities and channel availability conditions.
2Adaptability or versatility
If a fixed HARQ feedback position is used in traditional systems, then the implementation is simple, but it cannot be applied to unlicensed spectrum where channel availability is uncertain
Solution Approach 1:
The patent applies universality by designing a feedback mechanism that works across both licensed and unlicensed spectra. The time window-based feedback system can accommodate different channel availability conditions, making it universally applicable. The mechanism handles both deterministic (licensed) and uncertain (unlicensed) channel conditions through the same configurable time window approach, eliminating the need for separate feedback mechanisms for different spectrum types.
Solution Approach 2:
The patent uses dynamics to adapt the feedback timing to channel availability conditions. In unlicensed spectra where channel availability is uncertain, the dynamic time window allows the system to wait for appropriate feedback opportunities rather than being constrained by fixed timing. This resolves the contradiction by providing a single mechanism that simplifies implementation across different spectrum types while adapting to their specific characteristics.
3Adaptability or versatility
If the time window for feedback is extended to improve flexibility, then communication adaptability increases, but the reliability of timely feedback decreases
Solution Approach 1:
The patent applies preliminary action by having the base station configure the time window parameters in advance based on expected channel conditions and communication requirements. This pre-configuration allows the terminal to know exactly when feedback is expected without requiring complex real-time decisions, thereby maintaining reliability while achieving flexibility. The preliminary configuration establishes clear expectations before the actual feedback transmission occurs.
Data Source
AI summary
The present disclosure relates to an uplink feedback method and apparatus, a terminal, a base station and a storage medium. The method includes: monitoring downlink information transmitted by a base station; transmitting uplink feedback information during a configured time window as a feedback to the downlink information, wherein the time window comprises a plurality of transmission units, and the uplink feedback information is transmitted by the terminal on any of the transmission units in the time window.