Beam Reporting Method for Uplink Payload Constraints
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Solution Overview
Problem
In next-generation wireless communication systems, particularly those using high-frequency millimeter waves, the need for beamforming to overcome path loss leads to a narrow field-of-view, requiring adaptive beam switching, but the variable data size of beam measurement results exceeds the fixed payload capacity of uplink channels, causing incomplete reporting of selected beam information.
Innovation Solution
A beam measuring and reporting method that configures the user equipment to report beam information in stages, using a two-stage approach where the base station controls the number of beams reported via the Physical Uplink Control Channel (PUCCH) and triggers additional reporting via the Physical Uplink Shared Channel (PUSCH) using an uplink grant, reducing computational loading and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports measurement results of multiple selected beams, then the beam selection accuracy is improved, but the payload size of the uplink channel exceeds the maximum capacity
Solution Approach 1:
The patent divides the beam measurement and reporting process into two stages: first stage reports a first number of selected beams with full measurement results, second stage reports a second number of selected beams with differential measurement results. This segmentation allows comprehensive beam information to be transmitted in manageable portions that fit within payload constraints while maintaining accurate beam selection.
Solution Approach 2:
The patent changes the reporting parameter from absolute measurement results to differential measurement results for the second number of beams. By reporting differences relative to a reference beam rather than absolute values, the payload size is reduced while preserving the ability to accurately identify selected beams.
2Measurement precision
If the UE performs beam measurements for all candidate beams, then the beam selection accuracy is improved, but the computational loading on the UE increases
Solution Approach 1:
The patent segments the candidate beams into two groups: a first number of beams with highest priority that require full measurement and reporting, and a second number of beams that require differential measurement. This reduces the computational complexity compared to measuring all candidate beams while still providing accurate beam selection through the two-stage reporting mechanism.
Solution Approach 2:
The patent applies partial action by not requiring full measurement reporting for all candidate beams. Instead, it performs measurements on a selected subset of beams with different reporting granularities, which is sufficient for accurate beam selection without the excessive computational burden of processing all candidate beams equally.
3Reliability
If the base station schedules resources for multiple selected beams, then the communication quality is improved, but the signaling overhead increases
Solution Approach 1:
The patent changes the signaling parameter from absolute measurement results to differential measurement results for the second group of beams. This parameter change reduces the number of bits required for reporting while maintaining the information needed for the base station to schedule resources for multiple beams with appropriate communication quality.
Data Source
AI summary
A beam measuring and reporting method adapted for a user equipment for a multibeam wireless communication system is provided. The method includes the following. A beam configuration for a plurality of first candidate beams is received. A channel measurement for each of the first candidate beams is performed in response to receiving the beam configuration. Beam information of at least one selected beam of the first candidate beams is reported in response to receiving the beam configuration.