SBFD Mobility Switching Using CLI Thresholds in NR Cells
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Solution Overview
Problem
Conventional time division duplex (TDD) operation in New Radio (NR) systems face limitations in uplink coverage, capacity, and latency, and there is a need to enhance duplex operation with subband non-overlapping full duplex (SBFD) configurations at the base station.
Innovation Solution
A wireless transmit/receive unit (WTRU) receives configuration information for SBFD operation, including CLI measurement information, and performs an LTM cell switch to a target base station based on measured cross-link interference (CLI) thresholds, enabling SBFD or non-SBFD operation for user data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SBFD operation is implemented to enhance uplink coverage and capacity, then system capacity and coverage are improved, but cross-link interference increases
Solution Approach 1:
The patent implements dynamic switching between SBFD and non-SBFD operations based on real-time CLI measurement. The WTRU monitors CLI levels and switches operational modes accordingly, allowing the system to adapt to changing interference conditions and maintain optimal performance
Solution Approach 2:
The patent changes the operational parameter (duplex mode) based on measured CLI thresholds. When CLI exceeds a threshold, the system transitions from SBFD to non-SBFD mode, and vice versa, thereby controlling interference levels while maintaining capacity
2Loss of time
If SBFD operation is used to reduce latency, then transmission latency is reduced, but interference management complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the WTRU measures CLI and reports it to the base station. Based on this feedback, the base station decides whether to enable SBFD operation, creating a closed-loop interference management system that reduces latency when conditions permit
Solution Approach 2:
The WTRU autonomously measures CLI and determines whether to use SBFD or non-SBFD operation based on predefined thresholds, reducing the need for complex network-controlled interference management while maintaining low latency performance
3Object-affected harmful factors
If dynamic switching between SBFD and non-SBFD operations is implemented, then interference is controlled, but system complexity increases
Solution Approach 1:
The patent configures CLI measurement settings and switching thresholds in advance through RRC signaling. The WTRU is pre-configured with measurement resources and decision thresholds, so when CLI measurement occurs, the switching decision can be made quickly without complex real-time calculations
Solution Approach 2:
The patent segments the frequency domain into different subbands for SBFD operation, allowing independent control and measurement of interference in different frequency regions. This segmentation enables more granular interference management while simplifying the overall switching decision logic
Data Source
AI summary
A source base station transmits configuration information to a wireless transmit/receive unit (WTRU). The WTRU receives the configuration information. The configuration information includes information indicating support for subband non-overlapping full duplex (SBFD) operation. Also, the configuration information includes information for SBFD operation, and information for non-SBFD operation. The base station transmits to the WTRU control information regarding a layer 1 (L1)/layer 2 (L2) triggered mobility (LTM) cell switch. The WTRU receives the control information. The control information further includes cross-link interference (CLI) measurement information. The WTRU then performs an LTM cell switch to a first target base station. Also, the WTRU measures CLI based on the received CLI measurement information. Moreover, if the measured CLI is lower than a first CLI threshold, the WTRU transmits user data to the first target base station using, based on the information for SBFD operation, SBFD operation.