Dynamic Sensing Bandwidth Selection for LBT Operations
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently determining the sensing bandwidth for listen-before-transmit (LBT) operations, leading to potential interference and reduced performance due to the fixed nature of existing methods, which do not adapt well to varying transmission conditions.
Innovation Solution
A user equipment (UE) dynamically selects the sensing bandwidth based on the transmission bandwidth of an uplink transmission, incorporating unlicensed frequency spectra, and adjusts it using historical noise or interference data to optimize bandwidth for reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed sensing bandwidth is used for LBT operations, then the system complexity is reduced and operation is simplified, but the adaptability to varying transmission conditions deteriorates and interference increases
Solution Approach 1:
The patent implements dynamic sensing bandwidth selection where the UE determines the sensing bandwidth based on the actual transmission bandwidth of the uplink signal. This allows the LBT operation to adapt to varying transmission conditions while maintaining a systematic approach through predefined bandwidth relationships.
Solution Approach 2:
The sensing bandwidth parameter is changed dynamically according to the transmission bandwidth. The system establishes a direct relationship where the sensing bandwidth is determined by the transmission bandwidth parameters, allowing flexible adaptation without complex decision logic.
2Measurement precision
If the sensing bandwidth is increased to improve detection accuracy, then the measurement precision of channel occupancy is improved, but the energy consumption and processing complexity increase
Solution Approach 1:
The patent applies partial action by scanning only the necessary portion of the spectrum corresponding to the actual transmission bandwidth. Instead of scanning the entire available spectrum, the UE performs scanning on a partial basis that is sufficient for detecting channel occupancy in the relevant bandwidth, thereby reducing energy consumption while maintaining adequate detection accuracy.
3Reliability
If the sensing bandwidth is dynamically adjusted based on transmission conditions, then the reliability of communication is improved and interference is reduced, but the device complexity increases
Solution Approach 1:
The patent changes the sensing bandwidth parameter dynamically based on transmission bandwidth conditions. By establishing a direct relationship between transmission bandwidth and sensing bandwidth, the system achieves reliable communication adaptation without requiring complex decision-making mechanisms or multiple configuration options.
Solution Approach 2:
The UE autonomously determines the sensing bandwidth based on its own transmission bandwidth parameters without requiring complex external configuration or control. The device serves itself by internally linking the sensing bandwidth selection to its transmission parameters, reducing the need for complex external control mechanisms.
Data Source
AI summary
A method of wireless communication includes performing, by a user equipment (UE), a scan in connection with a listen-before-transmit (LBT) operation. A sensing bandwidth associated with the scan is selected by the UE based at least in part on a transmission bandwidth of an uplink transmission, and at least a portion of the sensing bandwidth is included an unlicensed frequency spectrum. The method further includes transmitting, by the UE, the uplink transmission based on a result of the scan.