DCI-Based Uplink Resource Reconfiguration for Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently managing uplink transmissions due to resource misalignment with channel conditions and interference, particularly in grant-free scenarios where dynamic resource reconfiguration is not explicitly supported.
Innovation Solution
The use of downlink control information (DCI) to reconfigure uplink resources, incorporating hybrid automatic repeat request (HARQ) feedback, allows for dynamic adjustment of resources to mitigate interference and align with changing channel conditions, employing a unified signaling format that accommodates different user equipment (UE) capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If grant-free uplink transmissions are used to reduce signaling overhead, then device complexity and signaling overhead are reduced, but resource misalignment with channel conditions and interference increase
Solution Approach 1:
The UE autonomously selects uplink resources and transmits data without waiting for explicit scheduling grants, enabling grant-free transmission that reduces signaling overhead while maintaining acceptable reliability through self-service resource allocation
Solution Approach 2:
The system dynamically changes resource allocation parameters through DCI messages that update time-frequency resources, reference signals, and modulation schemes based on channel conditions, allowing adaptation without full grant-based signaling
2Device complexity
If static resource configuration is used to simplify resource management, then device complexity is reduced, but adaptability to changing channel conditions deteriorates
Solution Approach 1:
The system transitions from static to dynamic resource configuration by introducing DCI messages that enable real-time updates of uplink resource parameters, allowing the system to adapt to changing channel conditions while maintaining simplified UE implementation
Solution Approach 2:
The DCI format is designed to serve multiple functions simultaneously: it provides HARQ feedback, updates resource allocations, and adjusts transmission parameters, creating a universal control mechanism that handles various uplink scenarios without requiring separate signaling protocols
Data Source
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AI summary
A user equipment (UE) in a wireless communication system may be configured to use particular resources to send one or more uplink transmissions. However, sometimes during operation the particular resources the UE is configured to use are not well suited to the channel conditions at that time or result in interference or collision with other uplink transmissions. Systems and method are disclosed in which downlink control information (DCI) may be used to reconfigure one or more resources used by the UE for an uplink transmission. In some embodiments, resource reconfiguration instructions are sent by the base station along with hybrid automatic repeat request (HARQ) feedback. In some embodiments, a unified downlink signaling format is disclosed that may be used for UEs having different capabilities, with the bits of the unified downlink signaling relaying different instructions to different UEs depending upon the capability of the UE.