Dynamic UL-CG Configuration Selection for Sub-Band Full-Duplex Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in determining optimal uplink configured grant (UL-CG) configurations for sub-band full-duplex (SBFD) resource configurations, leading to resource conflicts and interference between uplink and downlink transmissions, which degrade performance and increase latency.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive multiple UL-CG configurations and select an appropriate configuration based on the resource configuration associated with a slot, allowing for dynamic switching between half-duplex (HD) and SBFD resource configurations to avoid conflicts, modify transmission parameters, and perform conflict resolution operations such as skipping occasions or adjusting modulation and coding schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single UL-CG configuration is used for all slots, then device complexity is reduced, but resource conflicts and interference occur between uplink and downlink transmissions in SBFD slots
Solution Approach 1:
The system dynamically selects between multiple UL-CG configurations based on the slot type (HD or SBFD). The UE determines the resource configuration of each slot and switches between a first UL-CG configuration for HD slots and a second UL-CG configuration for SBFD slots, allowing the system to adapt to changing conditions and avoid resource conflicts.
Solution Approach 2:
Different UL-CG configurations have different parameters optimized for different duplex modes. The second UL-CG configuration for SBFD slots includes modified transmission parameters such as adjusted time offsets, frequency resources, or modulation schemes that prevent interference with concurrent downlink transmissions, while the first configuration uses parameters optimized for traditional half-duplex operation.
2Object-affected harmful factors
If multiple UL-CG configurations are maintained for different slot types, then resource conflicts are avoided, but device complexity increases
Solution Approach 1:
The system uses dynamic selection based on slot type determination. The UE identifies whether each slot is HD or SBFD and selects the appropriate UL-CG configuration, maintaining multiple configurations but only activating the relevant one at any given time based on current slot conditions.
Solution Approach 2:
The patent modifies specific parameters of the UL-CG configuration based on slot type. The second configuration for SBFD slots contains adjusted parameters (such as time offsets, frequency resources, or transmission power) that resolve interference issues, while keeping the overall configuration structure similar to the first configuration, thereby managing complexity.
3Productivity
If uplink transmission occurs in SBFD slots without configuration adjustment, then throughput is maintained, but interference with downlink transmission increases
Solution Approach 1:
The second UL-CG configuration specifically modifies transmission parameters for SBFD slots to reduce interference. This may include adjusting the timing offset so uplink transmission occurs in frequency bands not used by downlink, modifying frequency resource allocation, or changing modulation and coding schemes to be more robust against interference, thereby maintaining throughput while reducing harmful effects.
Solution Approach 2:
The system dynamically adapts the UL-CG configuration based on whether the slot is designated for SBFD operation. When SBFD slots are detected, the UE switches to the second configuration that is specifically designed to coexist with downlink transmissions, allowing continuous throughput while managing interference through conditional parameter adjustment.
Data Source
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AI summary
A method of wireless communication includes receiving, by a user equipment (UE), a plurality of uplink configured grant (UL-CG) configurations and receiving, by the UE, an UL-CG. The method further includes selecting, based on a resource configuration associated with a slot, an UL-CG configuration from among the plurality of UL-CG configurations for an occasion of the UL-CG that is to occur during the slot. The method further includes performing an uplink transmission during the occasion of the UL-CG based on the selected UL-CG configuration.