IAB Transmission Parameter Control for DU-MT PSD Imbalance
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Solution Overview
Problem
The existing power control mechanisms in New Radio (NR) do not consider the power spectral density (PSD) imbalance between the distributed unit (DU) and mobile termination (MT) of an integrated access backhaul (IAB) node, leading to inefficiencies in power management.
Innovation Solution
A transmission parameter management method and apparatus that involves obtaining and utilizing assistance information to determine transmission parameters, including energy per resource element (EPRE) and power control parameters, to balance PSD between the DU and MT of an IAB node, employing open-loop and closed-loop power control mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the existing power control mechanism is used in NR, then the transmission can be performed with simple control, but the PSD imbalance between DU and MT of IAB node cannot be addressed
Solution Approach 1:
The patent implements a feedback mechanism where the MT reports its received power and channel state information to the DU, which then adjusts the uplink power control parameters. This closed-loop feedback enables the system to maintain PSD balance between DU and MT while building upon the existing simple power control structure.
Solution Approach 2:
The patent modifies the existing power control parameters by introducing new parameters specifically for IAB node power control. The DU and MT can independently adjust their transmit power parameters based on channel conditions and coordination requirements, enabling PSD balance without fundamentally changing the overall power control mechanism.
2Productivity
If the DU and MT transmit simultaneously without coordination, then the system can achieve higher throughput, but PSD imbalance occurs
Solution Approach 1:
The patent introduces dynamic power adjustment capabilities where the DU and MT can independently vary their transmit power levels in real-time based on channel conditions. This dynamic control allows simultaneous transmission to maintain PSD balance through continuous adaptation rather than fixed power levels.
Solution Approach 2:
The system performs preliminary power parameter determination before simultaneous transmission occurs. The DU calculates appropriate power parameters for the MT based on predicted channel conditions, enabling coordinated simultaneous transmission that maintains PSD balance from the outset.
3Measurement precision
If the UE is notified of EPRE in advance for SSB and CSI-RS transmission, then the UE can perform signal strength measurement, but the mechanism does not account for IAB node PSD balance requirements
Solution Approach 1:
The patent segments the power control mechanism into separate components for DU and MT operations. The DU maintains its own power control for downlink transmission to UEs, while the MT has independent power control for uplink transmission to the DU. This segmentation allows each side to optimize for its specific function while coordinating to maintain overall PSD balance.
Data Source
AI summary
This application discloses a transmission parameter management method and apparatus, and an electronic device. The transmission parameter management method is executed by a first integrated access backhaul IAB node and includes: obtaining assistance information related to a transmission parameter of a second IAB node and/or assistance information related to a measurement parameter; and determining a transmission parameter based on the assistance information.