TWT Wakeup Synchronization Using Sub-1024 μs Offset Encoding
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Solution Overview
Problem
The existing resolution of Target Wake Time (TWT) in wireless communication systems, particularly for Restricted TWT (r-TWT), is insufficient to align with the finer granularity required by latency-sensitive traffic such as extended reality (XR) and Cloud Gaming (CG), leading to significant latency issues due to mismatch between burst arrival times and TWT service periods.
Innovation Solution
The proposed solution involves redefining the TWT field encoding to provide sub-1024 μs granularity, allowing for more precise synchronization of TWT service periods by extending the TWT field size and using new encoding schemes to indicate finer resolutions, such as a new Extended TWT element with sub-1024 μs precision, ensuring alignment with traffic arrival times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing TWT field encoding is used, then the system maintains simplicity and compatibility with current standards, but the resolution is insufficient to align with latency-sensitive traffic requirements
Solution Approach 1:
The TWT field is segmented into multiple components: a base TWT value and an offset value. The offset field is divided into a most significant byte (MSB) and a least significant byte (LSB), allowing fine-grained adjustment of TWT timing without increasing overall field size. This segmentation enables sub-1024 μs resolution while maintaining compatibility with existing TWT structures.
Solution Approach 2:
The patent introduces a new dimension to the TWT encoding by adding an offset field with sub-1024 μs granularity. Instead of increasing the base TWT field size, the solution adds a separate offset dimension that provides fine-tuning capability. This dimensional approach allows precise timing alignment for latency-sensitive traffic while keeping the base encoding simple.
2Loss of time
If the TWT field resolution is increased to sub-1024 μs granularity, then latency performance for XR and CG applications is improved, but the encoding complexity and processing overhead increase
Solution Approach 1:
The timing adjustment is segmented into a coarse component (base TWT with 1024 μs granularity) and a fine component (offset with sub-1024 μs granularity). This segmentation allows the system to achieve sub-millisecond latency for XR and CG applications while keeping the encoding manageable by dividing the precision requirements across multiple fields.
Solution Approach 2:
The patent changes the parameters of the TWT encoding by introducing an offset field with specific bit allocations (MSB and LSB bytes). This parameter change enables sub-1024 μs resolution without fundamentally altering the existing TWT mechanism, allowing latency optimization for time-sensitive applications while maintaining a structured encoding approach.
3Measurement precision
If a new Extended TWT element is introduced with sub-1024 μs precision, then synchronization accuracy with traffic arrival times is improved, but compatibility with legacy systems decreases
Solution Approach 1:
The patent extracts the fine-grained timing information into a separate offset field rather than modifying the base TWT element. This extraction allows legacy systems to ignore the offset field and process only the base TWT values, while newer systems can utilize both the base TWT and offset for enhanced synchronization accuracy. This approach maintains backward compatibility while enabling sub-1024 μs precision for supported devices.
Solution Approach 2:
The solution implements a dynamic encoding scheme where the offset field can be conditionally applied. Legacy systems process TWT values with standard 1024 μs granularity, while systems supporting the extended format can utilize the additional sub-1024 μs precision. This dynamic approach allows the system to adapt to different capability levels, maintaining compatibility across diverse device populations while enabling high-precision synchronization where supported.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication at a station, generally including obtaining signaling indicating a resolution of a target wake time (TWT) field, determining a start time of a TWT service period (SP) based on the indicated resolution, and taking action based on the determined start time of the TWT SP.