Separate Uplink and Downlink Beam Reporting Under MPE Constraints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in selecting and reporting uplink and downlink beams separately, as the best beam for uplink communication may differ from the best beam for downlink communication, leading to reduced throughput and potential maximum possible exposure (MPE) issues.
Innovation Solution
The proposed solution involves selecting and reporting downlink and uplink beams separately based on channel state information (CSI) reference signals (CSI-RS), allowing the UE to select an uplink beam without limiting transmission power for MPE reasons, and indicating whether to report beams jointly or separately via radio resource control (RRC) signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint beam selection and reporting is used, then device complexity and signaling overhead are reduced, but throughput decreases when best uplink and downlink beams differ
Solution Approach 1:
The patent segments the beam selection and reporting process into separate uplink beam selection and downlink beam selection operations. The UE independently selects uplink beams based on uplink channel conditions and downlink beams based on downlink CSI-RS measurements, allowing each beam type to be optimized for its specific direction without being constrained by joint selection requirements.
2Productivity
If separate uplink and downlink beam reporting is implemented, then throughput increases when beams differ, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent employs a universal beam reporting framework where a single beam report structure can convey both uplink beam selection and downlink beam selection information. The beam report includes fields for both uplink beam identifiers and downlink beam identifiers, allowing dual functionality within a unified reporting mechanism rather than requiring separate reporting procedures.
3Productivity
If uplink beam selection is constrained by MPE limits, then safety requirements are met, but transmission power is limited reducing communication efficiency
Solution Approach 1:
The patent implements dynamic beam selection where the UE can adaptively choose uplink beams based on real-time MPE constraints and channel conditions. The beam selection process dynamically adjusts between MPE-constrained beams and non-constrained beams, selecting the optimal beam that maximizes transmission efficiency while respecting safety limits when humans are detected in certain directions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive and measure channel state information (CSI) reference signals (CSI-RS)s transmitted by a network entity. The UE may select and report downlink and uplink beams separately based on the measurements of the CSI-RS. Selecting and reporting the downlink and uplink beams separately may increase throughput in the case that the best uplink beam is different from the best downlink beam. Additionally, a UE may select an uplink beam on which the UE does not limit transmission power for maximum possible exposure (MPE) reasons. The network entity may indicate to the UE, for example via radio resource control (RRC) signaling, whether to select and report a downlink beam and an uplink beam separately or jointly.