Adaptive Channel State Feedback for DRX Power Efficiency
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Solution Overview
Problem
In wireless communication systems, generating accurate channel state feedback (CSF) during discontinuous reception (DRX) mode is challenging due to limited on-duration and the time required for channel estimation to converge, which affects power consumption and communication efficiency.
Innovation Solution
The User Equipment (UE) determines whether to generate a new CSF report or reuse a previous one based on the time required for stable CSF values, channel estimation warm-up length, and other factors such as Doppler shift and connection characteristics, to minimize power consumption and ensure accurate feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE wakes up early to allow channel estimates to converge and generate accurate CSF reports, then the measurement precision of CSF is improved, but the power consumption increases due to extended on-duration
Solution Approach 1:
The patent implements dynamic adaptation of CSF reporting strategy based on channel conditions. The UE determines whether to generate new CSF reports or reuse previous ones by evaluating channel variance and Doppler shift, making the system flexible rather than static. This dynamic approach allows the UE to wake up early only when channel conditions warrant accurate measurements, otherwise reusing previous reports to save power.
Solution Approach 2:
The patent changes the parameter of CSF report generation timing based on channel estimation characteristics. By monitoring channel variance and Doppler shift parameters, the system adjusts the wake-up time and CSF generation decision accordingly. When channel conditions are stable (low variance, low Doppler), the UE can reuse previous CSF reports; when conditions change rapidly, the UE wakes up early to generate fresh reports.
2Reliability
If the UE generates new CSF reports frequently to maintain accuracy, then the reliability of channel state information is improved, but the productivity of the system decreases due to increased processing overhead
Solution Approach 1:
The patent implements a feedback mechanism where the UE evaluates channel conditions (variance, Doppler shift) and uses this information to decide whether to generate new CSF reports or reuse previous ones. This feedback-driven decision process ensures that CSF reports are generated only when necessary, maintaining reliability while avoiding unnecessary processing overhead that would reduce system productivity.
Solution Approach 2:
Instead of always generating full CSF reports, the patent applies partial action by selectively generating reports only when channel conditions change significantly. When channels are stable, the UE reuses previous reports, performing minimal processing. This partial action approach maintains sufficient reliability while dramatically reducing processing overhead and improving system productivity.
3Use of energy by moving object
If the UE minimizes DRX overhead to reduce power consumption, then the use of energy is improved, but the measurement precision of channel estimates deteriorates due to insufficient warm-up time
Solution Approach 1:
The patent applies preliminary action by having the UE wake up early enough to allow channel estimates to converge before generating CSF reports when accuracy is needed. However, this early wake-up is not always required - the UE evaluates channel conditions and only performs preliminary channel estimation when necessary, otherwise reusing previous CSF reports without extended warm-up, thus balancing power consumption with measurement precision.
Solution Approach 2:
The system dynamically adjusts the channel estimation warm-up time based on evaluated channel conditions. When channel variance and Doppler shift indicate rapid changes, the UE extends warm-up time to ensure accurate estimates. When conditions are stable, the UE minimizes or eliminates warm-up time by reusing previous reports, optimizing the trade-off between power consumption and measurement precision in real-time.
Data Source
AI summary
Providing adaptive channel state feedback (CSF) reports in discontinuous reception (DRX) scenarios in a power-efficient manner. The described algorithm may be able to make adaptive decisions to carry over the CSF from previous DRX cycles based on a comparison between an offset at which CSF values are stable and an offset at which a CSF report is to be sent to a base station. If the CSF values are not stable by the time the CSF report is to be sent, a CSF report from a prior DRX cycle may be used. Alternatively, if the CSF value are stable by the time the CSF report is to be sent, a determination may be made to either generate a new CSF report or use a prior CSF report. The latter determination may be made based on various criteria, including channel conditions and DRX cycle length.