UE Beamforming for 5G Wireless Communication Systems
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Solution Overview
Problem
5G wireless communication systems face challenges in maintaining reliable beam tracking and mobility due to increased path loss at higher frequencies, leading to reduced cell coverage and faster degradation of channel quality, especially with limited concurrent high-gain beams that can be formed by access points.
Innovation Solution
The method involves user equipment (UE) beamforming, where UE devices receive indications from the network to select and use specific beams for transmission or reception, adapting to conditions such as beam misalignment or changes, and performing beam sweeping to maintain connectivity and coverage, even in high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to increase antenna gain at high frequencies, then coverage and signal quality are improved, but the system complexity and difficulty of beam tracking increase
Solution Approach 1:
The UE autonomously detects beam misalignment conditions and selects alternative beams without network intervention. The UE performs self-service beam tracking by monitoring its own beam quality and independently switching beams when degradation is detected, reducing the complexity of network-controlled beam management.
Solution Approach 2:
The network pre-configures multiple candidate beams for the UE before beam misalignment occurs. When beam switching is needed, the UE can immediately switch to a pre-configured alternative beam, avoiding the complexity of real-time beam search and selection procedures.
2Measurement precision
If the network controls all beam selection and switching, then beam alignment accuracy is improved, but the response time to beam misalignment increases
Solution Approach 1:
The UE continuously monitors beam quality metrics and provides feedback to the network about beam alignment status. This feedback mechanism enables the network to detect misalignment conditions and initiate beam switching procedures faster, reducing the overall response time while maintaining alignment accuracy through coordinated network control.
Solution Approach 2:
The network pre-configures multiple candidate beams and switching criteria before misalignment occurs. When the UE detects beam degradation, it can immediately switch to a pre-configured alternative beam while notifying the network, achieving fast response without sacrificing alignment precision.
3Speed
If UE autonomously selects beams without network indication, then response speed to beam changes is improved, but beam alignment accuracy deteriorates
Solution Approach 1:
The UE autonomously detects beam misalignment conditions and selects alternative beams from pre-configured candidates without network intervention. This self-service approach enables fast beam switching while maintaining alignment accuracy by relying on the UE's own measurements and the network-prepared beam options.
4Reliability
If multiple high-gain beams are formed concurrently, then coverage and capacity are improved, but the complexity of beam management increases
Solution Approach 1:
The system segments beam management into distinct functions: the network is responsible for configuring candidate beams and receiving alignment feedback, while the UE handles autonomous beam selection and switching. This segmentation reduces overall system complexity by distributing management responsibilities according to each entity's capabilities.
Data Source
AI summary
A method for a wireless communications system is disclosed. In one example, a user equipment (UE) (e.g. a mobile phone), receives an indication from a network about one or more UE beams that the UE can use for transmission or reception. The UE uses the one or more UE beams for transmission or reception. If and when a certain condition is fulfilled, for example, there is a beam tracking failure, the UE transmits or receives a specific signal via a specific UE beam. The specific UE beam is different from the one or more UE beams that were indicated by the network, and is selected by the UE.