Terminal Device Dynamic TDD Interference Avoidance
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Solution Overview
Problem
In radio communication systems employing dynamic TDD, interference occurs between uplink control signals and downlink signals due to differing configurations across mobile stations, degrading the reception quality of uplink control signals.
Innovation Solution
A terminal apparatus and base station apparatus that perform periodic channel state information reporting, using specific UL-DL configurations to determine reporting periodicity and timing, thereby avoiding interference by synchronizing uplink and downlink operations based on received information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is applied to improve throughput by changing uplink-downlink configuration, then system throughput is improved, but interference occurs between uplink control signals and downlink signals when different mobile stations use different configurations
Solution Approach 1:
The base station determines the uplink-downlink configuration based on actual traffic conditions and feeds back this configuration information to mobile stations. The mobile station receives and applies the configured uplink-downlink configuration to determine subframe directions, ensuring synchronized operation and avoiding interference while maintaining dynamic adaptability for throughput improvement
Solution Approach 2:
The system dynamically changes the uplink-downlink configuration parameters based on traffic conditions. By introducing configuration information that specifies subframe directions and adjusting these parameters dynamically, the system achieves both high throughput and interference avoidance through coordinated parameter management
2Adaptability or versatility
If flexible subframes are used to enable dynamic resource allocation, then resource utilization is improved, but reception quality of uplink control signals deteriorates due to configuration mismatches
Solution Approach 1:
The base station performs preliminary configuration by determining the uplink-downlink configuration in advance based on traffic conditions and transmitting this configuration information to mobile stations before actual communication occurs. This preliminary action ensures that mobile stations are pre-aligned with the correct subframe directions, maintaining both flexibility and reliability
Solution Approach 2:
The configuration information acts as an intermediary between the base station's traffic adaptation decisions and the mobile station's transmission/reception operations. This intermediary mechanism ensures that flexible resource allocation does not compromise uplink control signal quality by coordinating actions through standardized configuration signaling
Data Source
AI summary
A terminal apparatus which performs periodic channel state information reporting to a base station apparatus, the terminal apparatus including a reception unit that receives first information, second information, and index information indicating a value for reporting periodicity of the channel state information, from the base station apparatus, and a transmission control unit that determines the value for reporting periodicity of the channel state information on the basis of the index information, in which the applicable value is based on a certain UL-DL configuration, in which, in a case where the second information is not configured, the certain UL-DL configuration is a UL-DL configuration indicated by the first information, and in which, in a case where the second information is configured, the certain UL-DL configuration is a UL-DL configuration indicated by the second information. Consequently, in a radio communication system which employs dynamic TDD, interference with a downlink signal is avoided, and an uplink control signal is transmitted.