FDD MIMO Beam Power Thresholds for Neighbor-Cell Interference
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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 degrades system performance.
Innovation Solution
Implement spatial-frequency combination coefficients with restriction rules to limit the energy of spatial domain beams, reducing interference by configuring and reporting amplitudes and phases that satisfy specific thresholds, thereby improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-power spatial domain beams are used to improve signal transmission performance, then communication quality is improved, but interference to neighboring cells increases
Solution Approach 1:
The patent applies parameter changes by introducing threshold parameters (Q thresholds) that constrain the power levels of spatial domain beams. The terminal device determines spatial-frequency combination coefficient vectors where the power of each spatial domain beam basis vector is restricted to be less than or equal to a corresponding threshold, thereby reducing interference to neighboring cells while maintaining communication quality.
Solution Approach 2:
The patent implements local quality by assigning different power thresholds to different spatial domain beams based on their directional characteristics and interference potential. Each spatial domain beam basis vector is associated with a specific Q threshold, allowing selective power control for beams that point toward neighboring cells versus those that do not, optimizing the balance between signal strength and interference reduction.
2Adaptability or versatility
If spatial domain beams pointing to neighboring cells are used to maintain communication coverage, then system coverage is improved, but interference to neighboring cells increases
Solution Approach 1:
The patent uses parameter changes by configuring Q thresholds for spatial domain beams based on their spatial directions and coverage characteristics. Beams pointing toward neighboring cells are assigned lower power thresholds, while beams for local coverage maintain higher power levels, enabling the system to adapt beam power dynamically based on spatial orientation and interference potential.
Solution Approach 2:
The patent converts the potentially harmful effect of high-power beams causing interference into a beneficial mechanism by using the interference information to determine appropriate power thresholds. The terminal device reports spatial-frequency combination coefficient vectors that inherently limit the power of interfering beams, transforming the interference problem into a control mechanism that improves overall system performance.
Data Source
AI summary
Examples of communication methods and devices are described. In one example method, 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.