RRM Measurement Accuracy in Heterogeneous Networks via Resource Partitioning
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Solution Overview
Problem
Wireless communication networks face performance degradation due to severe interference between cells in heterogeneous networks, which hinders effective radio resource management (RRM) measurements.
Innovation Solution
The implementation of resource partitioning techniques between cells, including intra-frequency and inter-frequency or intra-RAT and inter-RAT alternatives, allows for determining specific subframes for RRM measurements with minimal interference, using cooperative resource partitioning to designate subframes for measurements that are less affected by neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RRM measurements are performed in heterogeneous networks without resource partitioning, then measurement coverage is comprehensive, but measurement accuracy deteriorates due to severe interference from neighboring cells
Solution Approach 1:
The patent segments the time-frequency resources by introducing resource partitioning information (RPI) that divides subframes into different types (e.g., MBSFN subframes, non-MBSFN subframes). This segmentation allows RRM measurements to be performed in specific subframes where interference from neighboring cells is reduced or eliminated, thereby improving measurement accuracy without requiring comprehensive measurement coverage across all subframes.
Solution Approach 2:
The patent introduces resource partitioning information (RPI) as an intermediary mechanism that mediates between serving cell and neighboring cells. The RPI indicates which subframes are suitable for RRM measurements by identifying subframes where neighboring cells will not transmit or will transmit with reduced power, thus acting as a mediator to reduce interference and enable accurate measurements.
2Measurement precision
If resource partitioning is implemented to reduce interference, then RRM measurement accuracy improves, but network coordination complexity increases
Solution Approach 1:
The patent changes the parameter of subframe configuration by introducing RPI that specifies which subframes are designated for RRM measurements. This parameter change allows the network to control interference patterns through configuration rather than complex real-time coordination, simplifying the implementation while maintaining measurement accuracy.
3Object-affected harmful factors
If RRM measurements are performed during measurement gaps, then interference from serving cell is reduced, but measurement time increases for inter-frequency or inter-RAT measurements
Solution Approach 1:
The patent applies preliminary action by configuring resource partitioning information in advance, so that the UE knows which subframes are suitable for RRM measurements before actually performing them. This allows the UE to plan its measurement activities efficiently, reducing the need for extended measurement gaps while ensuring measurements are performed in low-interference subframes.
Data Source
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AI summary
Methods and apparatus for performing radio resource management (RRM) measurements in a heterogeneous network (HetNet) are provided in an effort to prevent failure of RRM measurement procedures in a dominant interference scenario. Several alternatives are provided for determining particular resources (e.g., subframes) to use for performing the RRM measurements, wherein the particular resources are based on cooperative resource partitioning between cells of the HetNet, wherein the cells may be of different types (e.g., macro, pico, or femto cells). These alternatives include, for example: (1) intra-frequency or intra-RAT (radio access technology) alternatives, which may involve transmitting resource partitioning information (RPI) in or deriving non-serving cell RPI based on the serving cell's RPI, as well as (2) inter-frequency or inter-RAT alternatives, where the RRM measurements may be performed during a measurement gap.