Dynamic Interface Selection for Co-Channel Interference Mitigation
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Solution Overview
Problem
Heterogeneous cellular networks (HetNets) face radio co-channel interference between macrocells and small cells, leading to reduced traffic capacity and degraded user experience due to high radio frequency interference, especially in overlapping and border coverage areas.
Innovation Solution
Macrocells and small cells dynamically select between the X2 and S1 interfaces for Further Enhanced Inter-Cell Interference Coordination (FeICIC) control communications based on round trip delay (RTD) time, allowing for improved performance by using the interface with the smallest latency and providing redundancy to mitigate single-point failures and integration challenges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the X2 interface is used for FeICIC control communications, then integration challenges and single-point failures are mitigated, but latency increases reducing coordination precision
Solution Approach 1:
The patent introduces the S1 interface as an intermediary communication path between macrocells and small cells for FeICIC control communications. This alternative interface acts as a mediator that bypasses the latency and reliability issues of the X2 interface, allowing control messages to be transmitted through the core network when the direct X2 path is unavailable or suboptimal.
Solution Approach 2:
The patent dynamically changes the communication interface parameter (from X2 to S1 or vice versa) based on real-time conditions such as interface availability, latency measurements, and network state. This parameter switching allows the system to optimize between reliability and latency by selecting the most appropriate interface for current operating conditions.
2Loss of time
If the S1 interface is used for FeICIC control communications, then latency is reduced improving coordination precision, but integration complexity increases
Solution Approach 1:
The patent makes the FeICIC control communication system universal by supporting multiple interface types (both X2 and S1 interfaces). This multi-functionality allows the system to adapt to different network configurations and deployment scenarios, reducing integration complexity by providing a standardized alternative path rather than requiring complex customizations for each scenario.
Solution Approach 2:
The patent implements dynamic interface selection where the system can switch between X2 and S1 interfaces based on real-time performance metrics and network conditions. This dynamic behavior allows the system to optimize for low latency when using S1 while falling back to X2 when appropriate, managing integration complexity through adaptive rather than static configuration.
3Productivity
If heterogeneous networks with small cells are deployed, then network capacity and user experience are improved, but radio co-channel interference increases
Solution Approach 1:
The patent implements FeICIC control communications that provide feedback mechanisms between macrocells and small cells. Through this feedback loop, cells exchange information about their transmission schedules, interference levels, and resource usage, allowing them to coordinate and adjust their operations to minimize co-channel interference while maintaining high network capacity.
Solution Approach 2:
The patent enables preliminary coordination of transmission schedules and resource allocation between macrocells and small cells before actual data transmission occurs. By pre-coordinating through FeICIC control messages exchanged over selected interfaces, the system can prevent interference conflicts in advance, allowing small cells to be deployed at high capacity without generating excessive harmful interference.
Data Source
AI summary
Techniques described herein relate to reducing co-channel interference between macrocells and small cells in a heterogeneous network environment. Macrocells and small cells may dynamically select from among multiple interfaces (e.g., an X2 or S1 interface) to communicate FeICIC control communications. In one implementation, the selection may be based on the round trip delay (RTD) time between pairs of nodes. Thus, the macrocells and small cells nodes may dynamically select either the X1 or S1 interface based on whichever of these interfaces has the smallest RTD to the destination radio node.