Network Controlled Repeater Beam Search Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing beam search in high-frequency bands like millimeter wave and THz frequencies due to propagation attenuation and straightness, which affects the reliability and speed of communication.
Innovation Solution
The proposed solution involves a network-controlled repeater (NCR)-based beam search method that utilizes carrier sensing to set and update a communication-possible area, thereby limiting the beam candidate group and reducing the time required for beam search. This method incorporates accumulated data from past successful user equipment (UE) communication experiences to enhance the accuracy of beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide beam search procedure is performed to ensure comprehensive coverage, then the probability of finding a suitable beam increases, but the time required for beam search increases significantly
Solution Approach 1:
The system performs preliminary carrier sensing to identify communication-possible areas before conducting the beam search. This preliminary action narrows down the search space to only those directions where communication is feasible, eliminating the need to search all possible directions and thus reducing beam search time while maintaining success probability
Solution Approach 2:
The beam search space is segmented into multiple regions based on carrier sensing results. Instead of performing a uniform wide beam search across all directions, the system divides the search space into communication-possible areas and communication-impossible areas, focusing the beam search only on the relevant segments where successful communication is likely
2Measurement precision
If carrier sensing is performed continuously to update beam candidate groups, then the accuracy of beam selection improves, but the power consumption increases
Solution Approach 1:
Instead of continuous carrier sensing, the system performs carrier sensing periodically or at specific intervals. The beam candidate group is updated based on these periodic sensing operations, which maintains sufficient accuracy for beam selection while significantly reducing power consumption compared to continuous sensing
Solution Approach 2:
The system utilizes accumulated data from past successful UE communication experiences to maintain beam candidate groups. This self-service approach allows the system to leverage historical information, reducing the frequency and intensity of carrier sensing operations needed to maintain accurate beam selections
Data Source
AI summary
Proposed are an apparatus and a method for NCR-based beam search in a wireless communication system. A beam search procedure performed by a network-controlled repeater (NCR) in a wireless communication system includes performing carrier sensing under control of a base station to set a communication-possible area, limiting a beam candidate group on the basis of the communication-possible area to shorten the time taken for beam search, and continuing the carrier sensing even after the beam search procedure is initiated, to update the beam candidate group.