Dynamic Subframe Reconfiguration for TDD Interference Mitigation
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Solution Overview
Problem
Interference between neighboring base stations and user equipment in time division duplex (TDD) wireless communication systems reduces the benefits of resource sharing due to mismatches in subframe allocations for uplink and downlink transmissions, leading to UE-to-UE and BS-to-BS interference.
Innovation Solution
Implementing dynamic subframe reconfiguration mechanisms that allow for the detection and mitigation of interference by exchanging messages between base stations and user equipment, adjusting subframe allocations to prevent collisions and mismatches, and using existing communication interfaces like the X2 interface to coordinate transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dynamic subframe reconfiguration is implemented to reduce interference, then UE-to-UE interference is reduced, but device complexity increases due to message exchange and coordination mechanisms
Solution Approach 1:
The system performs preliminary actions by having base stations exchange subframe allocation information in advance through X2 interface messaging. The high interference indicator mechanism allows base stations to proactively identify and report potential interference conditions before they affect user equipment, enabling preventive coordination rather than reactive interference mitigation.
Solution Approach 2:
The patent implements a feedback mechanism where base stations monitor interference conditions and exchange high interference indicators through the X2 interface. When a base station detects high interference conditions, it sends an indicator to neighboring base stations, which then adjust their subframe allocations accordingly. This closed-loop feedback system enables continuous optimization of interference management.
2Productivity
If subframe allocations are dynamically adjusted to prevent interference, then resource sharing efficiency improves, but loss of time occurs due to reconfiguration signaling and coordination overhead
Solution Approach 1:
The system employs periodic action by establishing regular intervals for subframe allocation updates and interference indicator exchanges. Base stations periodically share their subframe allocation configurations with neighboring base stations through X2 interface messaging, allowing the system to maintain up-to-date interference information without continuous signaling overhead. This periodic update mechanism balances resource sharing efficiency with signaling time consumption.
3Measurement precision
If base stations exchange detailed subframe allocation information to detect interference, then measurement precision improves, but loss of information occurs due to signaling overhead and message size limitations
Solution Approach 1:
The patent extracts only the essential interference-related information from complete subframe allocation data. Instead of exchanging full subframe configuration details, base stations exchange high interference indicators that specifically flag subframes with potential interference conditions. This extraction approach maintains interference detection accuracy while minimizing signaling overhead and message size.
Solution Approach 2:
The system applies local quality by providing differentiated information exchange based on specific interference conditions. Rather than uniformly exchanging all subframe allocation information between all base stations, the system selectively shares high interference indicators only for subframes where interference is detected or predicted. This localized information exchange reduces overall signaling overhead while maintaining precise interference detection where needed.
Data Source
AI summary
Embodiments of the claimed subject matter provide embodiments of methods for supporting dynamic sub frame reconfiguration in a time division duplex wireless communication system. One embodiment includes transmitting, from a first base station to a second base station, a message indicating that the first base station is configured for scheduling uplink transmissions from first user equipment in one or more subframes of a time division duplex frame. The message is transmitted when the second base station is configured for downlink transmission to second user equipment in the subframe(s).