UE Timeline Quantization for Lower-Complexity ACK/NACK Timing
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Solution Overview
Problem
Conventional techniques for determining when user equipment (UE) should transmit acknowledgement (ACK) or negative acknowledgement (NACK) after receiving a physical downlink shared channel (PDSCH) transmission are computationally expensive for the UE.
Innovation Solution
The UE transmits a report indicating its capability to support symbol level or slot level quantization, and upon receiving control signaling, communicates a subsequent transmission via a second channel at a quantized start timing determined by slot level quantization, simplifying the determination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional techniques are used to determine when UE should transmit ACK or NACK, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The timing determination process is segmented into two levels: slot-level quantization for coarse timing determination and symbol-level adjustment for fine timing precision. This segmentation allows the UE to first determine timing at the slot level (reducing complexity) and then apply symbol-level adjustments (maintaining precision) when needed.
Solution Approach 2:
The patent introduces dynamic switching between slot-level quantization and symbol-level timing determination based on operational conditions. The UE can adaptively select the appropriate timing granularity depending on the specific transmission scenario, balancing computational complexity and timing precision dynamically.
2Device complexity
If slot level quantization is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The timing determination is segmented into slot-level quantization for coarse timing and symbol-level adjustments for fine timing. This allows the system to benefit from the reduced complexity of slot-level quantization while maintaining the precision of symbol-level timing through selective application of symbol-level adjustments.
Solution Approach 2:
Different levels of timing precision are applied locally based on operational needs. Slot-level quantization is used for general timing determination where high precision is not critical, while symbol-level adjustments are applied locally in scenarios requiring higher timing precision, optimizing the balance between complexity and precision.
3Measurement precision
If symbol level quantization is used, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The UE dynamically selects between slot-level quantization and symbol-level timing determination based on operational conditions. By switching to slot-level quantization when high precision is not required, the UE reduces computational energy consumption while maintaining adequate timing accuracy for the given scenario.
Solution Approach 2:
The timing granularity parameter is changed based on operational needs. The system transitions between different quantization levels (slot-level vs. symbol-level) by adjusting the timing parameter granularity, thereby controlling energy consumption while adapting to different precision requirements.
4Measurement precision
If conventional timing determination is used, then timing accuracy is improved, but loss of time increases
Solution Approach 1:
The timing determination process is segmented into slot-level quantization (fast, low precision) and symbol-level adjustment (slower, high precision). This segmentation allows the UE to quickly determine timing at the slot level and only perform more time-consuming symbol-level adjustments when necessary, reducing overall processing time while maintaining accuracy when needed.
Solution Approach 2:
The UE performs preliminary timing determination at the slot level before potentially applying symbol-level adjustments. This preliminary action provides a quick initial timing estimate that can be used in many cases without requiring the more time-consuming symbol-level calculation, thereby reducing average processing time.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some cases, a user equipment (UE) may transmit, to a base station, a report indicating a capability of the UE to support symbol level quantization, slot level quantization, or both. The UE may identify that the UE is to utilize the slot level quantization. For instance, the UE may receive control signaling indicating that the UE is to utilize slot level quantization and may perform the identifying based on receiving the control signaling. The UE may receive a first transmission via a first channel and may communicate, responsive to receiving the first transmission, a second transmission via a second channel at a quantized start timing determined in accordance with the slot level quantization.