Terminal Device Dynamic TDD Subframe Configuration
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Solution Overview
Problem
In radio communication systems employing dynamic TDD, there is a lack of sufficient examination into the possibility of uplink and downlink signal collisions, which hinders efficient transmission and reception of signals.
Innovation Solution
The implementation of a method that allows for efficient transmission and reception of uplink and downlink signals by setting up multiple cells for mobile stations, using a Time Division Duplex (TDD) scheme, and specifying the configuration of subframes for simultaneous uplink and downlink operations, ensuring proper alignment of transmission and reception in radio communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD is applied to improve throughput by changing uplink-downlink resource ratio, then system adaptability and productivity are improved, but the risk of uplink and downlink signal collisions increases
Solution Approach 1:
The patent implements dynamic TDD by enabling flexible subframes that can dynamically switch between uplink and downlink directions based on traffic conditions. The base station controls this dynamic configuration through signaling to mobile stations, allowing the system to adapt resource allocation in real-time while maintaining reliable operation through coordinated control
Solution Approach 2:
The patent employs feedback mechanisms where the base station monitors traffic conditions and sends control signals to mobile stations to adjust uplink-downlink configuration. This feedback loop enables the system to adapt to changing traffic patterns while preventing signal collisions through centralized coordination
2Adaptability or versatility
If flexible subframes are used for traffic adaptation, then resource allocation flexibility is improved, but the complexity of determining HARQ timing and avoiding signal collisions increases
Solution Approach 1:
The patent establishes preliminary rules for HARQ timing determination based on the relationship between flexible subframes and reference subframes. By pre-defining timing relationships and configuration patterns, the system reduces the complexity of real-time HARQ timing determination while maintaining flexible resource allocation
Solution Approach 2:
The patent manages complexity by changing parameters in a structured manner - defining specific relationships between flexible subframes and reference subframes, and establishing predetermined timing patterns. This parameter-based approach allows flexible resource allocation while keeping HARQ timing determination manageable through standardized rules
Data Source
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AI summary
A terminal device includes: a setting unit that sets resources used to calculate a channel quality indicator; a reception unit that monitors a physical downlink control channel accompanied with information indicating an uplink-downlink configuration; a measurement unit that performs interference measurement to calculate the channel quality indicator based on the resource excluding at least the resource in an uplink subframe which is based on the uplink-downlink configuration; and transmission unit that transmits the channel quality indicator via a physical uplink shared channel. The transmission unit adjusts transmission with the physical uplink shared channel to which a physical downlink control channel accompanied with an uplink grant corresponds in subframe n + k based on detection of the physical downlink control channel accompanied with the uplink grant in subframe n. The setting unit sets a second uplink-downlink configuration. Here, k is given based on the second uplink-downlink configuration.