TDD Radio Base Station Feedback Timing Control
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Solution Overview
Problem
In LTE-A systems, dynamic changes in DL/UL configuration in TDD schemes can disrupt the timely transmission of acknowledgement signals, leading to difficulties in feedback and potential system performance deterioration due to delayed or unbalanced feedback.
Innovation Solution
A radio base station with a determining section to set feedback timing for acknowledgement signals before configuration changes and a control section to reconfigure UL subframes based on the feedback range after changes, ensuring appropriate transmission of acknowledgement signals even with changes in DL/UL configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DL/UL configuration is changed dynamically to adapt to traffic fluctuations, then system adaptability and resource utilization are improved, but feedback timing of acknowledgement signals becomes disrupted and transmission reliability deteriorates
Solution Approach 1:
The patent determines feedback timing of acknowledgement signals in advance, before the DL/UL configuration change takes effect. This preliminary determination ensures that the feedback timing is established when the original configuration is still valid, preventing timing disruptions caused by configuration changes.
Solution Approach 2:
The patent dynamically adjusts the DL/UL configuration based on traffic conditions while maintaining feedback timing integrity. The system allows configuration changes to adapt to varying traffic demands, but the feedback timing is determined based on the configuration state before change, creating a dynamic system that maintains reliability during transitions.
2Reliability
If feedback timing is maintained according to original configuration, then transmission reliability is preserved, but feedback delay increases and productivity decreases
Solution Approach 1:
The feedback timing is determined in advance before configuration changes occur, allowing the system to prepare the optimal feedback timing based on the current configuration state. This preliminary determination prevents timing conflicts while minimizing feedback delay by establishing the timing while configuration parameters are still valid.
Solution Approach 2:
The system changes the DL/UL configuration parameters dynamically based on traffic conditions, while the feedback timing parameters are determined based on the configuration state before change. This separation allows the system to optimize both configuration adaptability and feedback timing efficiency.
3Adaptability or versatility
If DL/UL configuration changes are implemented, then resource allocation flexibility is improved, but feedback distribution becomes unbalanced and system performance deteriorates
Solution Approach 1:
The feedback timing for each DL subframe is determined in advance before configuration changes occur. This preliminary determination ensures that the feedback distribution is planned and balanced based on the current configuration state, preventing unbalanced feedback distribution that would result from abrupt configuration changes.
Solution Approach 2:
The system dynamically changes configuration parameters to optimize resource allocation, while the feedback timing parameters are established based on the pre-change configuration state. This approach maintains feedback distribution balance while allowing flexible resource allocation.
Data Source
AI summary
In order to provide feedback information of a transmission acknowledgement signal or the like appropriately even in change in DL/UL configuration in TDD, a radio base station that communicates with a user terminal by time division duplex that is capable of controlling change in DL/UL configuration is provided. The user terminal includes a receiver that receives information to change a DL/UL configuration in time division duplex, receives higher layer signaling including first information about HARQ feedback timing, and receives downlink control information including second information about the HARQ feedback timing. The user terminal determines the HARQ feedback timing for a downlink shared channel based on the first information and the second information.