Terminal Device CSI Subframe Prioritization for Dynamic TDD Interference
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Solution Overview
Problem
In communication systems employing dynamic time division duplex (DTDD), uplink physical channels can collide, leading to interference and unsuitable communication performance due to unmanaged transmission timings.
Innovation Solution
A terminal device and base station apparatus that receive and transmit channel state information (CSI) subframe sets through higher layer signaling, prioritizing CSI reports and configuring physical uplink control channels (PUCCH) to manage interference and adapt traffic resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic time division duplex (DTDD) is employed to adapt traffic and reduce interference, then uplink and downlink resource allocation flexibility is improved, but uplink physical channel collision and interference occur due to unmanaged transmission timings
Solution Approach 1:
The patent implements dynamic TDD by allowing the base station to change uplink-downlink subframe configurations adaptively based on traffic conditions. The base station transmits eIMTA configuration information to terminal devices, enabling dynamic adjustment of resource allocation while maintaining coordinated transmission timing through standardized uplink timing relationships (n+k rule), thus achieving both flexibility and collision avoidance
Solution Approach 2:
The patent employs feedback mechanisms where terminal devices report channel state information (CSI) to the base station, which uses this feedback to optimize resource allocation decisions. The base station adjusts uplink-downlink configurations based on received CSI reports and traffic conditions, creating a closed-loop system that adapts to changing conditions while maintaining synchronized timing to prevent collisions
2Measurement precision
If multiple CSI subframe sets are configured to improve channel state information reporting, then communication accuracy is improved, but transmission timing collision occurs between different uplink physical channels
Solution Approach 1:
The patent segments the reporting of channel state information by configuring multiple CSI subframe sets with different reporting requirements. Each subframe set can have independent CSI reporting configurations, allowing the system to distribute reporting across different time resources. This segmentation prevents collision by ensuring that CSI reports from different subframe sets are transmitted at different times while maintaining the accuracy needed for each set
Solution Approach 2:
The patent dynamically manages CSI reporting timing by allowing the base station to configure and adjust subframe set parameters adaptively. The base station can modify which subframes belong to which subframe set and adjust reporting periodicities based on traffic conditions and interference levels, optimizing the balance between reporting accuracy and collision avoidance in real-time
Data Source
AI summary
Provided is a terminal device that communicates with a base station apparatus and that includes: a reception unit that receives first information relating to a configuration of enhanced interference management and traffic adaptation (eIMTA) and second information relating to a channel state information (CSI) subframe set, through higher layer signaling; and a transmission unit that drops a CSI report which uses a physical uplink control channel (PUCCH) considering priorities among subframe sets in a case where, in the second information, a first CSI subframe set and a second CSI subframe set are configured.