Inter-subframe Load Balancing for TDD Inter-cell Interference
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Solution Overview
Problem
Existing wireless communication technologies, such as FFR and ICIC, primarily focus on frequency-domain and power resources for inter-cell interference coordination, neglecting the specific characteristics of the Time Division Duplex (TDD) system, which leads to inefficient resource allocation and high inter-cell interference due to uneven service load distribution across subframes.
Innovation Solution
A method and device for inter-subframe service load balancing, which determines the service load over a period, sets a threshold for resource utilization ratio, and transmits data accordingly, ensuring even distribution across subframes, thereby addressing the fluctuating service load in the TDD system and combining with inter-cell interference coordination technologies for joint interference alleviation in multiple resource dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If FFR and ICIC technologies are used to coordinate inter-cell interference, then interference coordination in frequency and power domains is improved, but time-domain resource allocation efficiency deteriorates due to neglecting TDD system characteristics and uneven service load distribution across subframes
Solution Approach 1:
The patent extends interference coordination from traditional frequency and power domains to include time domain by introducing inter-subframe load balancing. This multi-dimensional approach divides time resources into different subframes and applies different interference coordination strategies to each subframe based on service load characteristics, thereby improving overall resource allocation efficiency while maintaining interference coordination effectiveness.
Solution Approach 2:
The patent implements dynamic interference coordination by adapting resource allocation strategies to varying service loads across different subframes. Instead of using static frequency and power resource allocation, the system dynamically adjusts time-domain resource distribution based on real-time service load measurements, enabling flexible response to changing traffic conditions while coordinating inter-cell interference.
2Object-affected harmful factors
If frequency and power resources are limited for interference coordination, then inter-cell interference is reduced, but service load distribution becomes uneven across subframes leading to wasted time resources
Solution Approach 1:
The patent segments time resources into different subframes and applies differentiated interference coordination strategies to each segment based on service load characteristics. This segmentation allows the system to identify subframes with uneven load distribution and apply targeted resource allocation adjustments, ensuring uniform service load distribution across all subframes while maintaining interference coordination through frequency and power resource limitations.
3Object-affected harmful factors
If orthogonal time and frequency resources are allocated for beam coordination, then interference between users in same beam direction is reduced, but overall resource utilization decreases due to rigid resource partitioning
Solution Approach 1:
The patent changes resource allocation parameters dynamically based on service load conditions. Instead of rigidly allocating orthogonal time and frequency resources for beam coordination, the system adjusts resource allocation parameters adaptively, allowing non-orthogonal resource sharing when service loads are low while maintaining orthogonal allocation when interference is high, thereby improving overall resource utilization while still reducing same-frequency interference when necessary.
Data Source
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AI summary
The present application provides a method and device for processing inter-subframe service load balancing and processing inter-cell interference, which includes: when processing the inter-subframe service load balancing, determining a service load of a link in a time period; determining a resource utilization ratio threshold according to the service load; and transmitting service data in each subframe according to the utilization ratio threshold. The inter-subframe service load balancing is processed when the inter-cell interference is processed, and in combination with various inter-cell interference coordination technologies, interference mitigation in one of a frequency domain, power and a space domain or the combination thereof is processed by the interference coordination technology. The present application can relieve the phenomenon that the interference mitigation effect is not good as the load information can not adapt well to the dynamic change of the inter-subframe service load in a time division duplex system, and can further mitigate the inter-cell interference in a long term evolution system, and improve the entire throughput performance of the system and the service quality of the subscriber in the system.