Terminal Device Uplink Power Control in Dynamic TDD Systems
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Solution Overview
Problem
In communication systems employing dynamic time division duplex (DTDD), there is interference between uplink and downlink signals due to subframes being switched between uplink and downlink, leading to unsuitable communication.
Innovation Solution
A terminal device that receives configuration information and downlink control information (DCI) formats to schedule and set transmission power for uplink signals on specific subframes based on transmit power control (TPC) commands, ensuring suitable power control for uplink signals on both first and second subframe sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subframes are dynamically switched between uplink and downlink in DTDD systems, then communication flexibility and resource allocation efficiency are improved, but interference between uplink and downlink signals occurs due to timing misalignment
Solution Approach 1:
The patent divides subframes into two distinct sets: first subframe set with first TDD configuration and second subframe set with second TDD configuration. This segmentation allows different TDD configurations to be applied to different subframes, enabling flexible resource allocation while maintaining clear timing relationships within each subframe set to avoid uplink-downlink interference.
Solution Approach 2:
The patent enables dynamic switching between different TDD configurations by allowing the network to configure multiple subframe sets with different TDD UL/DL configurations. This dynamic capability allows the system to adapt to varying traffic conditions while maintaining proper timing alignment within each configured subframe set to prevent signal interference.
2Measurement precision
If multiple TDD configurations are applied to different subframe sets, then power control accuracy for uplink signals is improved, but device complexity increases due to multiple configuration management requirements
Solution Approach 1:
The patent applies different TDD configurations locally to different subframe sets based on their specific requirements. Each subframe set can have its own TDD UL/DL configuration optimized for its traffic pattern, allowing precise power control for uplink signals in each set while maintaining manageable complexity through structured configuration separation.
Solution Approach 2:
The patent creates a universal framework that can handle multiple TDD configurations simultaneously through a unified subframe set structure. The terminal device and base station can manage multiple configurations using a common protocol and signaling mechanism, reducing the perceived complexity despite supporting diverse TDD patterns across different subframe sets.
Data Source
AI summary
Provided is a terminal device that performs communication with a base station device, the terminal device including a reception unit that receives information relating to a first configuration, information relating to a second configuration, and a downlink control information (DCI) format; and a transmission unit that transmit an uplink signal to the base station device in a case where the uplink signal is scheduled based on the DCI format, and switching between DCI formats that are applied to subframe sets, respectively.