Beam Acquisition Rearrangement for Wireless Systems
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Solution Overview
Problem
In 5th generation wireless systems with centralized-radio access network (C-RAN) technologies, the existing beam acquisition methods are inefficient due to the need for the user equipment (UE) to scan all transmission beams to find the best pair, which prolongs the beam acquisition time and may result in missing the optimal beam pair.
Innovation Solution
The transmission beam pattern is rearranged by dividing beams into groups and sub-groups, and reordering them to ensure even distribution in the Azimuth angles of departure (AoD)-Zenith angles of departure (ZoD) domain, allowing the user equipment to only scan a part of the beams, thereby reducing the time needed for beam acquisition and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment scans all transmission beams to find the best beam pair, then the beam acquisition is exhaustive and reliable, but the beam acquisition time is prolonged and efficiency is reduced
Solution Approach 1:
The patent divides the complete set of transmission beams into multiple groups and further into sub-groups. The UE only needs to scan a subset of beams (one from each sub-group) rather than all beams, segmenting the exhaustive search into manageable portions that maintain reliability while reducing time.
Solution Approach 2:
The patent implements partial action by having the UE scan only a selected portion of transmission beams (one beam per sub-group) rather than performing a complete scan of all beams. This partial scanning approach, combined with proper beam arrangement, achieves sufficient reliability without the time cost of exhaustive scanning.
2Ease of operation
If the transmission beams are scanned in arbitrary order, then the scanning process is simple, but the distribution of beams in AoD-ZoD domain is uneven and may miss optimal beam pairs
Solution Approach 1:
The patent applies local quality by ensuring that each sub-group contains beams with specific angular characteristics. The beams within each sub-group are selectively arranged to provide uniform coverage in the AoD-ZoD domain, giving each local group (sub-group) the quality of representative angular diversity.
Solution Approach 2:
The patent changes the ordering parameters of transmission beams based on their angular characteristics (AoD and ZoD). By reorganizing beams according to their spatial parameters rather than arbitrary indices, the system achieves uniform angular distribution while maintaining a systematic scanning approach.
Data Source
AI summary
Machine-readable media, methods, apparatus and system for beam acquisition in a wireless system are disclosed. In some aspects, a base station may include a transceiver configured to map beam reference signals onto a plurality of transmission beams. The base station may further include a control module configured to divide the transmission beams into a plurality of groups, based at least in part on a plurality of logical indexes assigned to the transmission beams. The control module may be further be configured to divide the transmission beams of each of the groups into a plurality of sub-groups. The control module may be further configured to change a transmission beam order in at least one of the groups, in order to equalize and maximize logical index differences between transmission beams, which are adjacent to one another in a respective sub-group.