DL Power Adjustment for SBFD Self-Interference Mitigation
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Solution Overview
Problem
Existing technologies face challenges in mitigating the degradation of UE measurement performance and efficiently managing measurement behaviors while reducing self-interference in subband non-overlapping full duplex (SBFD) operations.
Innovation Solution
The implementation of DL power adjustment (DPA) indications and corresponding UE behaviors, such as power-level compensation, measurement restriction, skipping operations, and automatic gain control adjustments, to enhance measurement accuracy and reduce interference in SBFD systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If DL power adjustment is applied to reduce self-interference in SBFD operations, then interference mitigation is improved, but measurement accuracy degradation occurs
Solution Approach 1:
The network configures the UE with measurement restriction patterns and power adjustment indications in advance before actual measurements are performed. This allows the UE to proactively restrict measurements during periods when self-interference is expected to be high, rather than reacting after degradation occurs. The preliminary configuration includes setting up measurement restriction patterns that define which reference signals should be measured and which should be restricted based on anticipated interference conditions.
Solution Approach 2:
The measurement restriction pattern is made dynamic and configurable rather than fixed. The network can adaptively adjust the measurement restriction pattern based on current SBFD operation conditions, power adjustment levels, and interference characteristics. This dynamic configuration allows the system to optimize the balance between interference mitigation and measurement accuracy in real-time according to actual operating conditions.
2Measurement precision
If measurement restriction is implemented to improve measurement accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The UE is empowered to autonomously apply measurement restriction based on configured patterns without requiring continuous network control or complex coordination. The UE self-manages the measurement process by automatically restricting measurements according to the pre-configured measurement restriction pattern, reducing the need for complex network-UE coordination mechanisms and simplifying overall system management.
Solution Approach 2:
The measurement restriction pattern is defined by configurable parameters that can be adjusted by the network to control the degree and scope of measurement restriction. By changing these parameters, the network can flexibly control measurement behavior without redesigning the entire measurement management system, thereby managing complexity through parameterization rather than structural complexity.
3Measurement precision
If power-level compensation is applied to maintain measurement accuracy, then measurement precision is improved, but loss of energy increases
Solution Approach 1:
Instead of applying power-level compensation continuously or to all measurements, the system applies measurement restriction selectively to specific reference signals and time-frequency resources where self-interference is most problematic. This partial action approach focuses energy expenditure only where necessary to maintain measurement accuracy, rather than uniformly compensating across all measurements, thereby reducing overall energy loss.
Data Source
AI summary
Methods, apparatus and systems are disclosed. In one embodiment, a method may be implemented by a first Wireless Transmit/Receive Unit (WTRU). The method may include receiving configuration information indicating a first set of RBs for performing a CSI-RS measurement, receiving an indication indicating a second set of RBs, and receiving an indication indicating that a first set of symbols or slots is not configured for a certain type of duplexing method and a second set of symbols or slots is configured for the certain type of duplexing method. The method may also include measuring a first CSI-RS in the first set of RBs in a symbol or slot in the first set of symbols or slots, measuring a second CSI-RS in a symbol or slot of the second set of symbols or slots in RBs that are in both the first set of RBs and the second set of RBs. determining a CSI based on the measurement of the first CSI-RS and the second CSI-RS, and reporting the CSI.