5G UE Beam Reselection via Conditional Reference Signal Request
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Solution Overview
Problem
In 5G wireless communication systems, the process of reselecting a beam when a user equipment (UE) changes direction is time-consuming due to the need to measure signal strength for all beam pairs, leading to potential communication quality deterioration.
Innovation Solution
A method where the UE requests a second reference signal from the base station when certain conditions are met, such as a change in direction, to quickly determine a new beam pair, reducing the overhead and time required for beam reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures signal strength for all beam pairs to reselect a beam when direction changes, then the beam reselection is accurate, but the time required for reselection increases significantly
Solution Approach 1:
The patent applies partial action by having the UE measure only a subset of beam pairs rather than all beam pairs. When the UE detects a direction change, it selectively measures only certain beam pairs based on predetermined conditions (such as beams in the direction of movement or previously measured beams), thereby reducing measurement time while maintaining sufficient reselection accuracy.
Solution Approach 2:
The patent implements preliminary action by pre-configuring beam measurement information including beam indices, beam directions, and measurement conditions before the UE needs to reselect beams. The base station provides this preliminary beam information to the UE, so when direction change occurs, the UE can immediately use the pre-prepared information to perform rapid measurements without needing to process all possible beam pairs from scratch.
2Reliability
If the UE performs comprehensive beam measurement for all beam pairs, then the communication quality is maintained, but the overhead and complexity of the measurement process increases
Solution Approach 1:
The patent segments the beam measurement process into multiple stages and subsets. Instead of measuring all beam pairs uniformly, the UE divides the measurement into: (1) measuring only beam pairs that meet predetermined conditions, (2) using different measurement strategies based on whether the UE is moving or stationary, and (3) selectively reporting results to the base station. This segmentation reduces the overall complexity while maintaining communication quality through targeted measurements.
Solution Approach 2:
The patent introduces dynamic adaptation in the measurement process by allowing the UE to adjust its measurement behavior based on current conditions. The UE determines whether to perform comprehensive measurement or selective measurement based on factors such as direction change detection, movement status, and signal quality thresholds. This dynamic approach optimizes the balance between measurement thoroughness and process complexity.
3Measurement precision
If the base station transmits reference signals for all beams, then the UE can accurately measure and select the best beam, but the transmission overhead and time consumption increases
Solution Approach 1:
The patent extracts only the necessary reference signal transmissions from the complete set of all possible beam reference signals. The base station transmits reference signals only for beams that are relevant to the current measurement scenario, as determined by the UE's reported direction change and the predetermined measurement conditions. This extraction eliminates unnecessary reference signal transmissions, reducing overhead and time while preserving measurement accuracy for the relevant beams.
Data Source
AI summary
The present disclosure is related to a 5th generation (5G) or pre-5G communication system to be provided to support a higher data transmission rate since 4th generation (4G) communication systems like long-term evolution (LTE). A method for generating beam measurement information of user equipment (UE) is provided. The method of UE includes receiving a first reference signal from a base station, requesting a transmission of a second reference signal when a result of measuring the first reference signal satisfies a predetermined condition, receiving the second reference signal, and generating a measurement result based on the second reference signal.