Spatial Frequency Beam Selection for Interference Reduction
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Solution Overview
Problem
In frequency division multiplexing (FDD) MIMO systems, the downlink precoding vector cannot be estimated based on the uplink channel due to frequency band differences, leading to interference with neighboring cells when high-power spatial domain beams are used, which reduces system performance.
Innovation Solution
A communication method that selects spatial and frequency domain basis vectors and determines spatial-frequency combination coefficient vectors based on restriction rules associated with thresholds, to limit the energy of these vectors and reduce interference with neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-power spatial domain beams are used to improve signal transmission performance, then communication quality between terminal device and network device is improved, but interference to neighboring cells increases and system performance is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the power levels of spatial domain beams through restriction rules. Specifically, it restricts the power of spatial domain beams that point toward neighboring cells while allowing higher power for beams directed at intended recipients. This selective parameter adjustment resolves the contradiction by maintaining communication quality for legitimate transmissions while reducing harmful interference to neighboring cells through differentiated power control.
2Power
If spatial domain beam power is increased to improve signal strength, then downlink data transmission performance is improved, but energy restriction requirements create constraints on precoding vector design
Solution Approach 1:
The patent applies local quality by implementing spatially differentiated power control where different power levels are assigned to different spatial directions. The restriction rules create local power constraints specifically for beams pointing toward neighboring cells, while allowing higher power in other directions. This localized approach to power management improves signal strength where needed while imposing constraints only in specific spatial regions, thereby balancing performance improvement with manageable design complexity.
Data Source
AI summary
Embodiments of the present invention disclose a communication method and a device. Configuration information indicating one or more spatial domain beam basis vector groups and Q thresholds is received from a network device, where the Q thresholds correspond one-to-one to spatial domain beam basis vectors in the one or more spatial domain beam basis vector groups. L spatial domain beam basis vectors are selected from a spatial domain beam basis vector group set. K frequency domain basis vectors are selected from a frequency domain basis vector set for each of the L spatial domain beam basis vectors.