Radio Resource Management Subframe Alignment for Inter-Cell Interference
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Solution Overview
Problem
In multi-cell wireless communication systems, existing technologies face challenges in efficiently managing radio resources, particularly in dynamically changing environments where uplink-downlink configurations differ between serving and neighboring cells, leading to suboptimal radio resource management and increased interference.
Innovation Solution
A method for Radio Resource Management (RRM) in user equipment that involves receiving information about neighboring cell configurations from the serving cell, adjusting uplink-downlink subframes accordingly, and performing RRM measurements based on shared configurations, ensuring consistent RRM subframes for both serving and neighboring cells if their configurations match, and configuring subframes for downlink purposes only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different uplink-downlink configurations are used for serving and neighboring cells to adapt to system load changes, then adaptability is improved, but interference increases and measurement consistency deteriorates
Solution Approach 1:
The patent segments the subframes into different types (first type for RRM measurement, second type for non-measurement) and applies different configurations to different cell groups. The serving cell and neighboring cells are divided into measurement cell groups and non-measurement cell groups, allowing independent configuration of uplink-downlink patterns for each group, thus reducing inter-cell interference while maintaining adaptability.
Solution Approach 2:
The patent implements dynamic configuration where the network can flexibly adjust which cells belong to measurement cell groups and which belong to non-measurement cell groups based on system load conditions. This dynamic grouping allows the system to adapt to changing traffic patterns while maintaining measurement consistency within each group.
2Measurement precision
If separate RRM measurement configurations are used for serving and neighboring cells, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal configuration approach where cells within the same measurement cell group share identical uplink-downlink configurations and RRM measurement subframe patterns. This multi-functionality allows the UE to apply a single configuration set to multiple cells, reducing complexity while maintaining measurement precision through group-based optimization.
Solution Approach 2:
The patent establishes equipotential measurement conditions by ensuring all cells in a measurement cell group have the same uplink-downlink configuration and measurement subframe structure. This creates equivalent measurement environments across grouped cells, allowing consistent and precise RRM measurements without requiring complex cell-specific configurations.
3Measurement precision
If RRM measurements are performed in all subframes, then measurement precision is improved, but loss of time for data transmission increases
Solution Approach 1:
The patent implements periodic RRM measurement by designating specific subframes (first type subframes) for measurement purposes while other subframes (second type subframes) are used for data transmission. This periodic measurement approach maintains measurement precision by regularly sampling channel conditions while minimizing disruption to data transmission through structured time allocation.
Solution Approach 2:
The patent dynamically determines which subframes are allocated for RRM measurement based on the uplink-downlink configuration and cell group settings. The network can flexibly adjust the measurement subframe pattern to balance measurement needs against data transmission requirements, optimizing the trade-off between measurement precision and transmission efficiency.
Data Source
AI summary
The present invention relates to a radio resource management (RRM) measurement method of a terminal and a device therefor in a multi-cell wireless communication system. Particularly, the RRM measurement method comprises the steps of: receiving, from a serving cell, information associated with an RRM for a neighboring cell; and performing an RRM measurement for the neighboring cell according to the information associated with the RRM, wherein the serving cell and the neighboring cell are respectively set to change at least one uplink subframe according to a preset uplink-downlink configuration (UL-DL configuration) for downlink communication, and subframes for an RRM measurement for the neighboring cell are considered to be the same as subframes for an RRM measurement of the serving cell if the information associated with the RRM indicates the uplink-downlink configurations (UL-DL configurations) of the serving cell and the neighboring cell are the same.