Dynamic TWT Rescheduling for Low-Latency Wireless QoS
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Solution Overview
Problem
Augmented reality systems face challenges with high power consumption and latency due to limited battery capacity and wireless scheduling limitations, leading to data loss, packet loss, and increased end-to-end latency.
Innovation Solution
The electronic device and external device implement a method to identify missing data frames and retransmit them during a different period, rearrange wireless schedules, and adjust parameters to minimize latency and data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel estimation is performed frequently to track time-varying channels, then channel tracking accuracy is improved, but overhead increases and system resources are wasted
Solution Approach 1:
The patent changes the parameter of channel estimation frequency from fixed to variable, adjusting it dynamically based on channel conditions. When channel variations are detected to be significant, estimation frequency increases; when variations are minor, frequency decreases, thereby optimizing the balance between tracking accuracy and overhead.
Solution Approach 2:
The patent implements a feedback mechanism where the base station receives channel quality information from the terminal and adjusts the channel estimation frequency accordingly. This closed-loop control allows the system to adapt to changing channel conditions while minimizing unnecessary estimation operations, reducing overhead while maintaining accuracy.
2Speed
If channel estimation frequency is increased to track fast fading channels, then channel tracking capability is improved, but terminal power consumption increases
Solution Approach 1:
The patent makes the channel estimation frequency dynamic rather than static, allowing it to adapt to the actual channel fading speed. The estimation frequency is adjusted based on detected channel variation rates, enabling fast tracking when needed while conserving energy during stable channel conditions.
Solution Approach 2:
The patent changes the operational parameter of estimation frequency based on channel conditions and power state. When the terminal is in power-saving mode or channels are stable, the frequency parameter is reduced; when fast tracking is required, the parameter increases, optimizing the trade-off between tracking capability and power consumption.
3Adaptability or versatility
If channel estimation is performed at every scheduling interval, then scheduling flexibility is improved, but overhead and power consumption increase
Solution Approach 1:
The patent performs preliminary channel estimation at reduced frequency to predict future channel conditions. Based on these preliminary estimates and channel correlation properties, the system determines whether full channel estimation is needed at the next scheduling interval, allowing flexible scheduling decisions while reducing overall overhead.
Solution Approach 2:
The patent applies partial channel estimation at certain intervals rather than complete estimation at every scheduling opportunity. By using partial estimation results combined with channel prediction, the system maintains sufficient scheduling flexibility while significantly reducing the overhead associated with full estimation operations.
Data Source
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AI summary
According to various embodiments, an electronic device comprises a communication circuit operatively connected to an external electronic device, and at least one processor, wherein the at least one processor may be set to: determine one or more target-wake-time (TWT) parameters of at least one TWT service period on the basis of at least one of an amount of data transmitted from the external electronic device, an amount of data received from the external electronic device, and a bandwidth; for at least one TWT service period, check a quality of service (QoS) of at least one data frame, which is transmitted or received between the electronic device and the external electronic device and is transmitted or received for at least one TWT service period; change at least one TWT parameter from among the one or more TWT parameters on the basis of the checked QoS; and control the communication circuit to transmit or receive at least one next data frame for a next TWT service period on the basis of the changed at least one TWT parameter.