Multi-Beam Initial Access Using SSB-Based Beam Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining the presence of user equipment (UE) in multi-beam regions and selecting an optimal beam for initial access, which affects communication performance.
Innovation Solution
A method and device for initial access in a wireless communication system that involves receiving a synchronization signal block (SSB) from a base station, acquiring a master information block (MIB), determining multi-beam reception, and transmitting a random access channel (RACH) through the selected beam, utilizing signal-to-noise ratio (SNR) and reference signal received power (RSRP) measurements to optimize beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-beam transmission is used to improve coverage and capacity, then communication capacity and coverage are improved, but beam selection complexity and initial access difficulty increase
Solution Approach 1:
The base station performs preliminary beam sweeping and transmits synchronization signal blocks (SSBs) through multiple beams before the UE arrives. The UE can directly measure these pre-transmitted signals and select the optimal beam without needing to perform complex beam training, thus reducing initial access complexity while maintaining multi-beam capacity benefits
Solution Approach 2:
Reference signals are introduced as intermediary elements between the base station and UE for beam selection. The UE measures reference signal received power (RSRP) of different beams through these intermediary signals, which simplifies the beam selection process compared to direct data transmission measurement, while still enabling the system to utilize multiple beams for improved capacity
2Ease of operation
If traditional single-beam method is used, then initial access process is simple, but communication performance and coverage in complex environments deteriorate
Solution Approach 1:
The initial access process is segmented into distinct phases: synchronization signal block reception, reference signal measurement, and beam selection. This segmentation allows the system to maintain simplicity in each individual step while achieving improved communication performance through the combination of multiple beam measurements and selections
Solution Approach 2:
The system implements feedback mechanisms where the UE measures reference signal received power of multiple beams and reports measurements back to the base station. This feedback enables the base station to select the optimal beam for communication, improving reliability while keeping the UE's initial access process relatively simple through automated measurement and reporting
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method by which a user equipment performs in a wireless communication system, according to various embodiments of the present disclosure, may comprise the steps of: receiving a synchronization signal block (SSB) from a BS (BS); acquiring a master information block (MIB) on the basis of the SSB; determining, on the basis of the MIB, whether the SSB has been received through multi-beams from the BS; selecting one of the multi-beams if the SSB has been received through the multi-beams; and transmitting a random access channel (RACH) through the selected beam to the BS.