Terminal Device Power Control for DTDD Interference
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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 performance.
Innovation Solution
A terminal device is designed to perform suitable power control by setting transmission power based on parameters such as nominal power, pathloss compensation coefficient, and power control adjustment values, allowing for efficient communication in DTDD systems.
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 increases
Solution Approach 1:
The patent divides the flexible subframe into two distinct parts: a downlink period for downlink signal transmission and an uplink period for uplink signal transmission. This temporal segmentation allows the same frequency resource to be used for both uplink and downlink communications at different times, thereby improving resource utilization while avoiding simultaneous interference between opposing signal directions.
Solution Approach 2:
The patent implements dynamic configuration where the downlink period and uplink period within a flexible subframe can be adaptively adjusted based on traffic conditions. The base station can dynamically allocate the proportion of downlink and uplink resources, enabling the system to respond to varying communication demands while maintaining interference-free operation through proper time-division isolation.
2Reliability
If power control parameters are not properly adjusted in DTDD systems, then device complexity is reduced, but communication performance deteriorates due to interference
Solution Approach 1:
The patent incorporates feedback mechanisms where the base station receives uplink signals during the uplink period and uses this feedback to adjust power control parameters for subsequent transmissions. This allows the system to optimize communication performance by adapting to channel conditions while maintaining manageable device complexity through centralized control at the base station.
Solution Approach 2:
The patent utilizes parameter changes in power control settings to optimize communication performance. By adjusting power control parameters based on the dynamic division between downlink and uplink periods, the system can adapt to varying signal conditions and interference levels, thereby improving reliability without requiring complex device architectures.
Data Source
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AI summary
A terminal device configured to communicate with a base station device using one cell. The terminal device is configured to: set transmission power for transmission of a physical uplink shared channel on a subframe belonging to a first subframe set, based on a first parameter relating to power control adjustment; set transmission power for the physical uplink shared channel on a subframe belonging to a second subframe set, based on a second parameter relating to the power control adjustment; and calculate a value of the first parameter by accumulating a correction value indicated by a transmit power control command corresponding to the first subframe set, in a case that accumulation is enabled; calculate a value of the second parameter by accumulating the correction value indicated by the transmit power control command corresponding to the second subframe set, in a case that accumulation is enabled. Thus, the base station device and the terminal device can efficiently perform the transmit power control.