Quantized COT Indication for 5G NR Unlicensed Spectrum
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signaling remaining channel occupancy time (COT) duration within transmit opportunities (TXOP) due to high overhead bit requirements, which can lead to power consumption issues and incorrect monitoring configurations in 5G New Radio (NR) unlicensed spectrum communications.
Innovation Solution
The method involves quantizing the remaining COT duration to a COT floor or ceiling value, using fewer overhead bits in the control channel, and including bits to manage listen-before-talk (LBT) modes and sub-band usage indications, allowing for efficient monitoring and transmission management by both base stations and user equipment devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the remaining COT duration is signaled with precise bit representation, then the measurement precision is improved, but the overhead bit requirement increases
Solution Approach 1:
The patent applies parameter changes by transforming the continuous COT duration parameter into discrete quantized levels. The remaining COT duration is mapped to a set of predefined quantization levels (e.g., 0, 0.5ms, 1.0ms, 1.5ms, 2.0ms), which reduces the number of bits required for signaling while maintaining acceptable precision for system operation.
Solution Approach 2:
The patent uses partial action by providing quantized COT duration information that is sufficient for practical purposes but not perfectly precise. The quantization levels provide enough accuracy for transmission management and power saving operations, while avoiding the overhead of signaling every possible precise value.
2Measurement precision
If more overhead bits are used in the control channel, then the measurement precision of COT duration is improved, but the power consumption increases
Solution Approach 1:
The patent reduces power consumption by changing the parameter representation from precise continuous values to quantized discrete levels. This reduces the number of bits that need to be transmitted and processed, thereby lowering the energy consumption of the mobile device while maintaining functional accuracy for transmission management.
Solution Approach 2:
The patent uses a simplified quantized representation that is 'good enough' for the intended purpose. The quantization introduces some approximation error, but this is acceptable for the operational requirements, allowing the system to use fewer resources and less energy.
3Device complexity
If quantized COT duration is used, then the overhead bit requirement is reduced, but the monitoring precision may be affected
Solution Approach 1:
The patent provides more quantization levels than the minimum required, ensuring that the precision loss is negligible for practical operations. By using a sufficiently fine-grained quantization scheme, the system maintains adequate monitoring precision while achieving significant reduction in overhead bits.
Solution Approach 2:
The patent carefully selects the quantization levels and step sizes to ensure that the resulting precision loss does not impact transmission management. The quantization is designed to maintain sufficient accuracy for determining transmission timing and power saving operations.
4Reliability
If precise COT duration indication is provided, then the reliability of transmission management is improved, but the device complexity increases
Solution Approach 1:
The patent transforms the COT duration into a quantized parameter that maintains reliability for transmission management. The quantization levels are designed to preserve the essential timing information needed for reliable operation, while reducing the complexity of the signaling mechanism.
Solution Approach 2:
The patent uses a quantized representation that provides sufficient reliability for practical transmission management without requiring full precision. The quantization levels are spaced to ensure that timing decisions can be made reliably, while using fewer bits for signaling.
Data Source
AI summary
A base station may generate a channel occupancy time (COT) indication for a user equipment (UE), the COT indication including a bit configuration and a quantized remaining COT duration, and transmit the COT indication to the UE. The quantized remaining COT duration may be a COT floor or a lower quantization level, or to a COT ceiling or a higher quantization level, in which generating the COT indication for the UE may include using a slot format indicator to cancel a radio resource control configured uplink or downlink transmission between a COT duration and the COT ceiling or higher quantization level. UE methods include receiving a COT indication of a bit configuration and a quantized remaining COT duration, and communicating with the base station based on the COT indication. The UE may monitor a physical downlink control channel for uplink and downlink transmissions based on the quantized remaining COT duration.