Dynamic SBFD Guard-Band Adaptation for Cross-Link Interference
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Solution Overview
Problem
Conventional TDD operation in New Radio (NR) duplex systems face challenges with static sub-band non-overlapping full duplex (SBFD) configurations, leading to inefficiencies in cross-link interference management, which can be addressed through dynamic guard-band adaptation based on cross-link interference (CLI) measurements.
Innovation Solution
A wireless transmit/receive unit (WTRU) dynamically adjusts its resource blocks (RBs) to create a guard-band by puncturing RBs exceeding a CLI threshold, reporting CLI measurements, and receiving network acknowledgments to adapt SBFD configurations, including CLI measurement and reporting configurations, and UL transmissions with partial overlapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static SBFD configuration is used, then device complexity is reduced and ease of operation is improved, but cross-link interference management becomes ineffective and UL coverage deteriorates
Solution Approach 1:
The patent implements dynamic guard-band adaptation where the WTRU adjusts the guard-band configuration based on measured CLI levels. The guard-band width is dynamically modified in response to changing interference conditions, transitioning from a static configuration to a dynamic one that adapts to real-time CLI measurements, thereby improving interference management without requiring complete reconfiguration of the SBFD system
Solution Approach 2:
The patent changes the guard-band parameter (width in terms of resource blocks) based on CLI measurement thresholds. When CLI exceeds a threshold, the guard-band width is increased by puncturing additional RBs; when CLI is below the threshold, the guard-band width is reduced. This parameter adaptation resolves the contradiction by adjusting the specific guard-band configuration rather than changing the entire SBFD structure
2Reliability
If dynamic guard-band adaptation is implemented, then UL coverage is improved and CLI is reduced, but device complexity and measurement overhead increase
Solution Approach 1:
The patent implements a feedback mechanism where the WTRU measures CLI levels, compares them against thresholds, and adjusts the guard-band configuration accordingly. The WTRU reports CLI measurements and guard-band usage to the network, which acknowledges the reported information and may provide updated configurations. This closed-loop feedback system improves UL coverage while managing complexity through automated decision-making based on predefined thresholds
Solution Approach 2:
The WTRU autonomously performs CLI measurements, determines appropriate guard-band configurations, and adjusts its own transmission parameters without requiring continuous network intervention. The device serves itself by automatically adapting the guard-band width based on measured interference conditions, reducing the complexity burden on the network while improving UL coverage
3Object-affected harmful factors
If guard-band width is increased to reduce CLI, then interference management improves, but resource utilization deteriorates
Solution Approach 1:
The patent applies partial action by adjusting only the guard-band portion of the SBFD configuration rather than modifying the entire resource allocation. The guard-band width is dynamically adapted based on CLI levels, allowing the system to apply just enough protection against interference without unnecessarily sacrificing resources. When CLI is low, the guard-band is minimized; when CLI is high, it is increased only to the extent needed to manage interference
Data Source
AI summary
A system and method performed in a wireless transmit/receive unit (WTRU) are described. The method includes receiving a duplexing sub-band full duplex (SBFD) configuration information from a serving cell, the SBFD configuration information including a guard-band configuration associated with cross link interference (CLI) measurements, and a CLI threshold, determining that a measured CLI exceeds the CLI threshold, based on the determination that the measured CLI exceeds the CLI threshold, determining a set of resource blocks (RBs) to use as a first guard-band, performing an uplink (UL) transmission with the first guard-band by puncturing the determined set of RBs, wherein the UL transmission comprises reporting information on at least one of the punctured determined set of RBs used as the first guard band and the measured CLI, and receiving an indication from a network acknowledging the reporting information.