Separate TPC Accumulators for Full Duplex Symbol Interference
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Solution Overview
Problem
In 5G wireless communication networks, dynamic time division duplexing introduces high cross-link interference (CLI) in full duplex symbols, necessitating a power control technique to mitigate interference between uplink and downlink directions.
Innovation Solution
Implementing separate transmit power control (TPC) accumulators for full duplex and non-full duplex symbols, with one accumulator dependent on the other, to manage interference by updating power levels based on received commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is used to improve spectral efficiency, then spectral efficiency is improved, but cross-link interference increases
Solution Approach 1:
The patent divides the single power control mechanism into two separate TPC accumulators: one for FD symbols and another for non-FD symbols. This segmentation allows independent power control for different symbol types, enabling the system to maintain high spectral efficiency through dynamic TDD while separately managing the interference characteristics of FD symbols versus non-FD symbols.
Solution Approach 2:
The patent applies different power control parameters and accumulation mechanisms to different symbol types. The first TPC accumulator with its specific parameters (first step size, first accumulation level) is applied to FD symbols, while the second TPC accumulator with different parameters (second step size, second accumulation level) is applied to non-FD symbols. This local differentiation allows optimized interference management for each symbol type while maintaining overall system efficiency.
2Object-affected harmful factors
If separate TPC accumulators are implemented for FD and non-FD symbols, then cross-link interference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the functionality of two separate power control mechanisms into a unified framework where the second TPC accumulator is dependent on the first TPC accumulator. This dependency relationship allows the system to manage interference in FD symbols through the first accumulator while the second accumulator handles non-FD symbols in a coordinated manner, reducing the overall complexity compared to completely independent control mechanisms.
Solution Approach 2:
The first TPC accumulator serves multiple purposes: it controls power for non-FD symbols directly and also serves as the foundation for the second TPC accumulator that controls FD symbols. This multi-functionality reduces the need for completely separate control mechanisms, thereby managing device complexity while still achieving separate power control for different symbol types.
Data Source
AI summary
The present disclosure provides a wireless transmit/receive unit (WTRU) that maintains first and second transmit power control (TPC) accumulators. The WTRU receives, from a base station, a configuration including first and second sets of power control (PC) parameters associated with the first and second TPC accumulators, respectively. The WTRU receives a first TPC command, associated with the first TPC accumulator, from the base station. The WTRU updates the first TPC accumulator and the second TPC accumulator based on the first TPC command if the second TPC accumulator is dependent on the first TPC accumulator. The WTRU may maintain multiple TPC accumulators and may implement different TPC processes for different TPC accumulators. The different TPC accumulators may be associated with different symbol types. Hence, the WTRU may dynamically transmit one or more uplink channels and/or one or more uplink signals at different transmit power levels by utilizing corresponding TPC accumulators.