Asynchronous TDD Interference Coordination for Shared Spectrum
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Solution Overview
Problem
In communication systems with neighboring asynchronous TDD systems, interference occurs due to different slot assignments, leading to reduced spectrum bandwidth utilization as each system uses only a part of the available spectrum to avoid interference.
Innovation Solution
The method involves using shared frequency domain resources for communication in specific slots with different functions, allowing network devices to communicate using specified frequency domain resources and adjusting slot configurations to avoid interference and improve spectrum bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each TDD system uses a different frequency domain resource at geographical boundary to avoid interference, then interference between first TDD system and second TDD system is avoided, but available spectrum bandwidth is reduced and utilization of spectrum bandwidth is low
Solution Approach 1:
The frequency domain resource is segmented into multiple parts: a first frequency domain resource used by the first TDD system, a second frequency domain resource used by the second TDD system, and a third frequency domain resource that can be dynamically shared. This segmentation allows each system to have dedicated resources while enabling flexible sharing of additional resources to improve overall utilization.
Solution Approach 2:
The patent introduces dynamic resource allocation where the third frequency domain resource can be flexibly assigned to either the first or second TDD system based on actual service requirements and interference conditions. This dynamic approach replaces static frequency division with adaptive resource management that responds to changing network conditions.
2Adaptability or versatility
If slot assignment of first TDD system is different from slot assignment of second TDD system, then each system can meet different uplink-downlink asymmetric service requirements, but interference is generated when one system transmits uplink and the other transmits downlink in the same slot
Solution Approach 1:
The patent applies local quality by assigning different slot configurations to different geographical regions. The first slot configuration is used in a first area while the second slot configuration is used in a second area, allowing each region to be optimized for its specific service requirements while managing interference through spatial separation.
Solution Approach 2:
The patent introduces a third frequency domain resource as an intermediary that can be dynamically allocated to either system. This intermediary resource acts as a buffer that can be assigned to the first TDD system when it needs additional resources or to the second TDD system when it requires more bandwidth, thereby balancing service requirements across both systems.
3Reliability
If each TDD system uses only a part of spectrum bandwidth, then interference is avoided, but spectrum bandwidth utilization is reduced
Solution Approach 1:
The third frequency domain resource is designed with multi-functionality, serving both the first TDD system and the second TDD system at different times. This resource can function as an extension of the first system's bandwidth when needed, or as an extension of the second system's bandwidth when needed, maximizing the utility of the available spectrum.
Solution Approach 2:
The patent changes the parameter of frequency resource allocation from fixed to variable. The amount of frequency domain resource allocated to each system is not static but can be adjusted based on service demands, interference levels, and network conditions, allowing the system to adaptively optimize both interference avoidance and spectrum utilization.
Data Source
AI summary
Embodiments of this application disclose an interference coordination method and an apparatus. The method includes: A first TDD system and a second TDD system are adjacent asynchronous TDD systems of each other, the first TDD system communicates with UE in a first slot by using a first specified frequency domain resource, and the second TDD system communicates with the UE in a second slot by using a second specified frequency domain resource, where the first specified frequency domain resource is different from the second specified frequency domain resource. Alternatively, the first TDD system modifies a slot configuration of a third slot corresponding to the first slot when communicating with the UE in the first slot, and the second TDD system modifies a slot configuration of a fourth slot corresponding to the second slot when communicating with the UE in the second slot. The first slot and the second slot have same time domain positions and different functions.