Uplink Beam Selection Using Power Backoff Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the NR system, uplink transmission performance is compromised when beams face human bodies due to the need for power backoff to comply with maximum permissible exposure (MPE), leading to transmission loss.
Innovation Solution
A beam determination method that considers power backoff information and reference signal received power to identify optimal beams for uplink transmission, ensuring compliance with MPE and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam direction faces human body, then MPE compliance is achieved by lowering transmission power, but uplink transmission performance deteriorates due to power backoff
Solution Approach 1:
The terminal performs beam scanning and determines power backoff information for each beam direction in advance before actual data transmission. By pre-identifying beams that would require power backoff and reporting this information to the network side device, the system can select alternative beams that do not require power reduction, thus avoiding transmission performance loss while ensuring MPE compliance.
Solution Approach 2:
The terminal reports power backoff information and reference signal received power to the network side device as feedback. The network side device uses this feedback to determine the target beam for uplink transmission, selecting beams that minimize or eliminate power backoff requirements, thereby maintaining both MPE compliance and optimal transmission performance.
2Device complexity
If conventional beam determination is used, then beam selection is simplified, but transmission performance is lost when optimal beam requires power backoff
Solution Approach 1:
The terminal performs beam scanning and determines power backoff information for each beam direction in advance before actual data transmission. By pre-identifying beams that would require power backoff and reporting this information to the network side device, the system can select alternative beams that do not require power reduction, thus avoiding transmission performance loss while ensuring MPE compliance.
Solution Approach 2:
The terminal reports power backoff information and reference signal received power to the network side device as feedback. The network side device uses this feedback to determine the target beam for uplink transmission, selecting beams that minimize or eliminate power backoff requirements, thereby maintaining both MPE compliance and optimal transmission performance.
Data Source
AI summary
The embodiments of the present application relate to a beam determination method and device. When data is sent by means of the determined beam, loss of transmission performance is avoided. In the present application, a terminal sends reference information to a network side device according to configuration of the network side device, the reference information including power backoff information and/or reference signal received power, and the reference signal received power being obtained on the basis of the power backoff information; and the terminal receives a target beam indication sent by the network side device, and sends or receives a signal on the basis a target beam in the target beam indication, the target beam indication being determined by the network side device on the basis of the reference information.