Multi-beam CSI Feedback for mmWave Beam Blockage
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Solution Overview
Problem
In mmWave communication systems, beam blocking due to obstacles like moving objects or static structures reduces signal quality and reliability, particularly in 5G NR technology, where high path loss and short range issues are exacerbated, leading to reduced SNR and QoS.
Innovation Solution
Implementing multi-beam transmission and feedback mechanisms where User Equipment (UE) detects triggering events, such as beam blockage, and transmits Channel State Information (CSI) reports to the base station, allowing for dynamic beam adjustment and resource allocation to maintain communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-beam transmission is used in mmWave communication, then device complexity is reduced, but reliability deteriorates due to beam blocking from obstacles
Solution Approach 1:
The patent segments the communication system into multiple independent beams instead of using a single beam. Each beam can be independently managed and reported, allowing the system to maintain communication reliability even if one beam is blocked by obstacles, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements feedback mechanisms where User Equipment (UE) detects triggering events such as beam blockage and transmits Channel State Information (CSI) reports to the base station. This feedback enables dynamic beam adjustment and resource allocation, improving communication reliability while managing complexity through event-driven reporting.
2Reliability
If multi-beam transmission is implemented to overcome beam blocking, then reliability is improved, but device complexity increases due to multiple beam management operations
Solution Approach 1:
The patent configures multiple beams in advance before communication begins. The base station pre-establishes multiple potential beam paths, and the UE is pre-configured with beam measurement and reporting capabilities. This preliminary setup allows the system to quickly switch to alternative beams when blocking occurs without complex real-time decision-making, thus improving reliability while controlling complexity.
Solution Approach 2:
The patent implements selective beam reporting where the UE reports CSI only when triggering events occur (such as beam blockage detection), rather than continuously reporting all beam information. This partial action approach maintains reliability by ensuring critical beam status is reported while reducing complexity by avoiding excessive reporting overhead.
3Reliability
If continuous CSI reporting is performed for all beams, then communication quality is maintained, but loss of time and energy increases due to frequent uplink transmissions
Solution Approach 1:
The patent implements periodic beam measurement and reporting where the UE measures beams at configured intervals and reports only when changes exceed thresholds or triggering events occur. This periodic action maintains communication quality by regularly updating beam status while reducing time loss by avoiding continuous reporting.
Solution Approach 2:
The UE autonomously detects triggering events such as beam blockage and self-initiates CSI reporting only when necessary, rather than waiting for continuous scheduling from the base station. This self-service approach maintains communication quality by ensuring timely reporting of critical changes while minimizing time and energy loss by avoiding unnecessary transmissions.
Data Source
AI summary
In multi-beam communication, the UE may assist in the scheduling of beams utilized during the multi-beam communication by improving the manner in which the quality of the beam is reported to the network. The apparatus may measure a signal received from a base station on at least one beam. The apparatus may detect a triggering event for providing CSI for the at least one beam. The apparatus may transmit an uplink transmission comprising a CSI report in response to detecting the triggering event. The apparatus may receive an uplink request from a UE for providing CSI for at least one beam. The apparatus may transmit an indication scheduling a CSI report in response to the uplink request. The apparatus may receive an uplink transmission from the UE comprising the CSI report for the at least one beam.