Joint Phase-Time Array Beamforming for 5G Mobility Robustness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of maintaining robust beam alignment and mobility in 5G wireless communication systems, particularly in high-frequency bands, is exacerbated by high UE mobility and narrow beamwidth, leading to latency and connectivity issues.
Innovation Solution
Implementing Joint Phase-Time Arrays (JTPAs) for beamforming, which utilize true-time delay (TTD) and hybrid architectures to enhance beam alignment robustness through data repetition across multiple frequency resources and enhanced beam management procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If narrow beamwidth is used for beamforming in high-frequency bands, then data rate is improved, but mobility robustness deteriorates
Solution Approach 1:
The patent segments the beamforming approach by implementing Joint Phase-Time Arrays (JTPAs) that divide the antenna array into multiple independently controllable sub-arrays. Each sub-array can form and steer beams independently, allowing the system to maintain narrow beamwidth for high data rates while using multiple segmented beams to track mobile users, thereby improving mobility robustness without sacrificing data rate performance
Solution Approach 2:
The patent applies dynamics by enabling real-time adaptive beam steering and formation through JTPAs. The system dynamically adjusts phase and time delays across the segmented antenna sub-arrays to continuously track mobile users as they move, maintaining optimal beam alignment and connectivity. This dynamic adaptation allows the system to preserve narrow beam characteristics for high data rates while responding to mobility conditions
2Power
If high-frequency millimeter-wave bands are used, then data rate is improved, but beam alignment robustness deteriorates
Solution Approach 1:
The patent introduces JTPAs as an intermediary mechanism between the high-frequency signal transmission and the antenna array. The JTPA structure with true-time delay elements and phase shifters acts as a mediator that compensates for the inherent sensitivity of high-frequency beams to misalignment. This intermediary system provides fine-grained control over beam formation and steering, maintaining robust beam alignment at millimeter-wave frequencies while preserving the high data rate benefits
3Productivity
If narrow beamwidth is used, then spectral efficiency is improved, but latency increases due to beam alignment issues
Solution Approach 1:
The patent implements preliminary action through predictive beam steering capabilities enabled by JTPAs. The system uses channel state information and mobility patterns to anticipate user movement and pre-adjusts beam directions before misalignment occurs. This proactive approach maintains continuous optimal beam alignment, preventing latency caused by beam realignment delays while preserving narrow beamwidth for high spectral efficiency
Data Source
AI summary
Methods and apparatuses for mobility robustness with joint phase-time arrays (JTPAs). A method for operating a base station (BS), includes determining, based on a wide-beam (WB) alignment procedure, a subset of beams for transmission of physical downlink shared control channels (PDSCHs). The method further includes transmitting a physical downlink control channel (PDCCH) indicating the subset of beams and transmitting the PDSCHs on the subset of beams, respectively, using a JPTA beamforming. The same data is included in each of the PDSCHs.