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 shared subframes, leading to unsuitable communication performance.
Innovation Solution
A terminal device configured to receive information about subframe sets and adjust transmission power for physical uplink shared channels based on specific parameters, resetting these parameters upon receipt of random access responses or changes in accumulation values to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subframes are shared between uplink and downlink in DTDD systems, then resource utilization is improved, but interference between uplink and downlink signals increases
Solution Approach 1:
The patent segments subframes into two distinct sets: first subframe set for uplink transmission and second subframe set for downlink transmission. This segmentation prevents simultaneous uplink and downlink transmissions in the same subframe, thereby eliminating interference while maintaining high resource utilization through dynamic TDD operation.
Solution Approach 2:
The patent implements dynamic subframe set configuration where the base station can flexibly adjust which subframes belong to the first or second subframe set based on traffic conditions. This dynamic adjustment allows the system to adapt to varying uplink and downlink traffic demands while maintaining interference-free operation through proper power control parameter management.
2Reliability
If transmission power is increased to improve signal quality, then data transmission quality is improved, but interference with other signals increases
Solution Approach 1:
The patent applies different power control parameters specifically to subframes in the first subframe set versus the second subframe set. By configuring separate first and second parameters for different subframe sets, the system can optimize transmission power locally for each subframe type, ensuring sufficient signal quality for uplink transmissions in the first set while controlling interference in the second set.
Solution Approach 2:
The patent changes transmission power parameters based on the subframe set configuration. When subframe sets are configured, the terminal device uses first parameters for uplink power control in the first subframe set and second parameters in the second subframe set. This parameter change approach allows flexible power adjustment to maintain signal quality while minimizing interference.
Data Source
AI summary
Provided is a terminal device configured to communicate with a base station device, the terminal device being configured to: transmission power for transmission of a physical uplink shared channel in a subframe belonging to a first subframe set, based on a first parameter and a third parameter relating to power control adjustment; set transmission power for transmission of a physical uplink shared channel in a subframe belonging to a second subframe set, based on a second parameter and a fourth parameter relating to the power control adjustment; reset a value of the third parameter in a case that accumulation is enabled, and a random access response is received; and reset a value of the third parameter in a case that the accumulation is enabled, and a value of the first parameter is changed.