Almost Blank Subframe Allocation for Interference Management
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Solution Overview
Problem
Heterogeneous wireless communication systems face challenges in managing interference and optimizing subframe allocation due to the introduction of low-power nodes, which leads to imbalanced uplink and downlink coverage and limited performance gains, especially with co-channel deployments of macro and low-power nodes causing coverage holes and interference.
Innovation Solution
Implementing dynamic special subframe allocation and resource partitioning techniques, such as almost blank subframes, to mitigate interference and enhance cell range expansion, allowing for adaptive configuration of special subframes based on traffic load and network conditions, thereby reducing inter-cell interference and improving system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If co-channel deployment of macro and low-power nodes is implemented, then network coverage is extended, but interference increases and coverage holes are created
Solution Approach 1:
The patent segments the time domain into different subframe types (MBSFN subframes and non-MBSFN subframes) to separate service types. By configuring different carriers to use different subframe types for eMBB and uRLLC services, the system allows co-channel deployment while preventing interference through time-domain partitioning, thus extending coverage without creating coverage holes.
Solution Approach 2:
The patent applies local quality by allowing different carriers to have different subframe configurations tailored to specific service requirements. Each carrier can be configured with MBSFN or non-MBSFN subframes depending on whether it carries eMBB or uRLLC traffic, enabling optimized local service delivery while maintaining overall network coverage.
2Productivity
If dynamic subframe allocation is implemented, then spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic subframe allocation where the network can flexibly configure which subframes are designated as MBSFN or non-MBSFN subframes based on real-time traffic demands. This dynamic configuration allows the system to optimize spectral efficiency by allocating resources according to actual service requirements while maintaining manageable complexity through standardized configuration mechanisms.
Solution Approach 2:
The patent changes the configuration parameters of subframes (MBSFN vs. non-MBSFN) dynamically based on service requirements. By adjusting these parameters in response to traffic patterns, the system achieves high spectral efficiency without requiring complete system redesign, thus balancing performance improvement with acceptable complexity.
3Reliability
If carrier aggregation with different subframe configurations is used, then service performance is optimized, but interference management becomes more difficult
Solution Approach 1:
The patent segments carriers into different types based on their primary service (eMBB or uRLLC) and configures appropriate subframe types for each. This segmentation allows the system to optimize service performance on each carrier while simplifying interference management by creating clear boundaries between different service domains through standardized subframe configurations.
Data Source
AI summary
Aspects are described for use in wireless communications. A subframe allocation bitmap may indicate multiple subframes. The indicated subframes may correspond to Almost Blank Subframes. Measurement subframe allocation bitmaps may indicate measurement subframes. A first measurement subframe allocation bitmap may exclude subframes indicated by the subframe allocation bitmap. A second measurement subframe allocation bitmap may exclude the measurement subframes indicated by of the first measurement subframe allocation bitmap.