Duplex-Aware Transmit Power Control for Cross-Link Interference
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Solution Overview
Problem
Existing 5G NR wireless communication systems face challenges in managing inter-UE cross link interference and UE self-interference in full-duplex mode communications, which are not significant in half-duplex mode, necessitating differentiated power control strategies.
Innovation Solution
The technology differentiates between half-duplex and full-duplex mode transmission occasions to determine power control adjustment states (PCAS) using specific index values and accumulates transmit power control (TPC) command values accordingly, allowing for effective mitigation of inter-UE cross link interference and UE self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a unified power control strategy is used for both half-duplex and full-duplex transmission occasions, then the device complexity is reduced, but inter-UE cross link interference and UE self-interference in full-duplex mode cannot be effectively mitigated
Solution Approach 1:
The patent segments the power control adjustment state into separate states for half-duplex and full-duplex transmission occasions. The UE maintains distinct PCAS values (e.g., PCAS_HD for half-duplex and PCAS_FD for full-duplex) and selects the appropriate state based on the duplex mode of each transmission occasion, thereby applying differentiated power control strategies for each mode to effectively mitigate interference while managing complexity.
2Object-affected harmful factors
If separate power control adjustment states are maintained for half-duplex and full-duplex transmission occasions, then interference mitigation is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic selection of power control adjustment states based on the duplex mode of each transmission occasion. The UE dynamically switches between half-duplex PCAS and full-duplex PCAS states according to the transmission mode, allowing flexible adaptation to different operational conditions while maintaining separate states for optimal interference mitigation in each mode.
Solution Approach 2:
The patent incorporates feedback mechanisms where the network device provides TPC commands that indicate which PCAS state to use for upcoming transmission occasions. The UE accumulates and interprets these TPC commands in the context of the current duplex mode, using feedback from the network to dynamically adjust the appropriate power control state, thereby managing complexity through guided state selection.
3Measurement precision
If TPC command values are accumulated separately for half-duplex and full-duplex transmission occasions, then the precision of power control is improved, but the complexity of TPC command processing increases
Solution Approach 1:
The patent segments the TPC command accumulation process into separate accumulation registers or memory structures for half-duplex and full-duplex modes. The UE accumulates TPC commands received during half-duplex occasions into one accumulator and TPC commands received during full-duplex occasions into another accumulator, ensuring that power control adjustments are precisely tailored to the specific duplex mode conditions without cross-contamination of accumulated values.
Data Source
AI summary
In a wireless communication network, a user equipment (UE) determined a power control adjustment state (PCAS) for a transmission occasion based on a duplex mode of the transmission occasion by one or more of: using a PCAS function specific to the duplex mode of the transmission occasion; using a separate set of PCAS index values for each duplex communication mode; accumulating transmit power control (TPC) command values for half-duplex transmission occasions separately from accumulating TPC command values for full-duplex transmission occasions; interpreting a TPC command based on the duplex mode for the transmission occasion; and determining one of an accumulated PCAS and an absolute PCAS based on one of: i) an accumulated/absolute configuration of the half-duplex mode communication mode of the network device, ii) a radio resource control full-duplex mode communication mode accumulated/absolute parameter of the network device, and iii) a network device-configured full-duplex mode communication mode accumulated/absolute parameter.