Control-to-Data Beam Mapping to Reduce mmW Scan Overhead
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Solution Overview
Problem
The high path loss and short range of millimeter wave (mmW) radio frequency communications in LTE systems necessitate beamforming, which results in a large number of potential beams that need to be scanned, leading to excessive time consumption and beam overhead during the beamforming procedure.
Innovation Solution
A method to determine a mapping between control and data channel beams, either through explicit or implicit correlation, or independent selection based on signaling, to reduce the number of beams that need to be scanned, thereby speeding up the beamforming process and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to compensate for high path loss and short range in mmW communications, then communication reliability is improved, but the number of beams to be scanned increases significantly
Solution Approach 1:
The patent applies preliminary action by establishing a mapping relationship between control channel beams and data channel beams in advance. This mapping allows the UE to determine the data channel beam based on the control channel beam that has already been identified, thereby avoiding the need to scan all possible beams and reducing the scanning complexity while maintaining communication reliability.
2Measurement precision
If a large number of beams are scanned during beamforming procedure, then beam selection accuracy is improved, but time consumption increases
Solution Approach 1:
The patent extracts the essential relationship between control channel beams and data channel beams, using the control channel beam information to infer the data channel beam. This extraction approach maintains beam selection accuracy by leveraging the correlated nature of the beams while significantly reducing the time required by avoiding exhaustive scanning of all possible beams.
3Reliability
If exhaustive beam scanning is performed to ensure optimal beam selection, then communication quality is improved, but beam overhead increases
Solution Approach 1:
The patent introduces an intermediary mapping relationship as a mediator between control channel beams and data channel beams. This mapping serves as a bridge that allows the system to determine the optimal data channel beam without performing exhaustive scanning, thereby reducing beam overhead while maintaining communication quality through the established correlational relationship.
Data Source
AI summary
There is a need for a beam tracking technique that reduces the time needed to perform a beamforming procedure and that reduces beam overhead. The apparatus may determine a mapping between a first beam associated with a first type of channel and a second beam associated with a second type of channel. In an aspect, the first type of channel may be different than the second type of channel. The apparatus may receive the first beam associated with the first type of channel and the second beam associated with the second type of channel. In an aspect, the first beam and the second beam may be received from a second device.