mmWave-Guided THz Beam Selection for Multi-Band Communication
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently selecting and determining reception beams in beamforming-based systems supporting multiple frequency bands, particularly in mmW and THz bands, leading to increased search times and reduced cell coverage.
Innovation Solution
A communication method and apparatus that utilizes synchronization signal blocks (SSBs) transmitted through multiple beams in a first frequency band to determine an optimal transmission/reception beam pair in a higher frequency band, facilitating efficient beam selection and communication in systems supporting both mmW and THz bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam search is performed in THz band using multiple beams, then cell coverage is improved, but search time increases
Solution Approach 1:
The patent performs beam search in mmW band first to identify a candidate beam, then uses this information to guide the THz band beam search. This preliminary action in the lower frequency band reduces the search space for the higher frequency band, thereby maintaining comprehensive coverage while significantly reducing overall search time.
Solution Approach 2:
The patent uses mmW band beam search results as an intermediary to facilitate THz band beam search. The mmW band acts as a mediator that provides initial beam direction information, which then guides the THz band beamforming process, enabling efficient two-stage beam acquisition.
2Loss of time
If beam search is performed in mmW band first, then search time for THz band is reduced, but system complexity increases
Solution Approach 1:
The patent segments the beam search process into two distinct stages: first performing beam search in mmW band to obtain candidate beam information, then using this information to guide THz band beam search. This segmentation allows each stage to be optimized independently while reducing overall complexity compared to performing exhaustive search in THz band alone.
3Productivity
If multiple frequency bands are supported, then spectral efficiency is improved, but beam selection complexity increases
Solution Approach 1:
The patent performs preliminary beam search in mmW band to identify candidate beams before proceeding to THz band communication. This preliminary action establishes a foundation that simplifies subsequent beam selection in the higher frequency band, enabling multi-band operation without proportionally increasing complexity.
Solution Approach 2:
The patent changes the operating frequency parameter between bands, using mmW band for initial beam acquisition and THz band for high-speed communication. This parameter change strategy leverages the different propagation characteristics of different frequency bands to optimize both spectral efficiency and beam selection efficiency.
Data Source
AI summary
The present disclosure relates to a communication method and device in a beamforming-based wireless communication system supporting a plurality of frequency bands, the communication method for a terminal, according to an embodiment of the present disclosure, comprising the steps of: performing a beam search using a plurality of first reception beams in a first frequency band and receiving a synchronization signal block (SSB) comprising first information about a base station provided at the same location; performing, on the basis of the first information, a beam search for a plurality of second reception beams in a second frequency band belonging to a subset of the first reception beams that received the SSB in the first frequency band; and communicating with the base station in the second frequency band by selecting an optimal pair of transmission and reception beams as result of the beam search for the plurality of second reception beams.