RIS Beam Management via Backhaul-Access Link Segmentation
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Solution Overview
Problem
The complexity of beam searches in wireless communication systems with the introduction of reconfigurable intelligent surfaces (RIS) increases due to the need to manage beams for both the backhaul and access links simultaneously.
Innovation Solution
A method and apparatus for performing low-complexity RIS-based beam management by separating the beam search into two stages: first, performing a beam search on the backhaul link, and second, fixing the backhaul link beam information and performing a beam search on the access link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam search is performed for both backhaul and access links simultaneously, then complete beam management is achieved, but system complexity increases
Solution Approach 1:
The patent divides the beam search process into two independent stages: first performing beam search for the backhaul link between base station and RIS, then performing beam search for the access link between RIS and user equipment. This segmentation allows each link to be optimized independently, reducing overall system complexity while maintaining complete beam management for both links.
2Adaptability or versatility
If RIS operates in multi-beam mode for backhaul link beam search, then beam search coverage is improved, but system complexity increases
Solution Approach 1:
The patent dynamically switches the RIS operating mode based on the beam search stage: using multi-beam mode during the backhaul link beam search to achieve comprehensive coverage, then switching to single-beam mode during the access link beam search to simplify operations. This dynamic adaptation allows the system to optimize between coverage and complexity at different operational stages.
Data Source
AI summary
Proposed are an apparatus and a method for performing beam management based on a reconfigurable intelligent surface (RIS) in a wireless communication system. An operation method of a base station (BS) in a wireless communication system includes performing a beam search using at least one base station beam through a backhaul link between the base station and a reconfigurable intelligent surface (RIS), performing the beam search using a plurality of RIS beams for each of the at least one base station beam on the backhaul link when the RIS is set to a multi-beam mode, setting the RIS to a single-beam mode on an access link when the beam search of the backhaul link is completed, and performing a beam search of the access link by fixing beam information of the backhaul link.