Resource Usage Indication for Interference Reduction in NOMA
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Solution Overview
Problem
In next-generation wireless communication systems, there is a challenge in efficiently managing shared resources among multiple user equipment (UEs) to minimize interference and optimize communication modes, particularly in non-orthogonal multiple access (NOMA) frameworks, where existing methods lack effective mechanisms to indicate whether a UE will use allocated resources, leading to suboptimal uplink block error rates (BLER).
Innovation Solution
The system employs techniques to indicate whether a UE will use an allocated shared resource by sending messages between UEs and network entities, using cross-link interference frameworks, conventional channels, backscattering, or sidelink channels, allowing neighboring UEs to adjust their communication modes and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shared resources are allocated to multiple UEs in non-orthogonal multiple access, then resource utilization efficiency is improved, but interference between UEs increases
Solution Approach 1:
The patent implements a feedback mechanism where the first UE sends a resource usage indication message to neighboring UEs about whether it will use the allocated shared resource. This feedback allows neighboring UEs to adjust their transmission parameters accordingly, reducing interference while maintaining efficient resource utilization. The feedback loop enables dynamic adaptation to resource usage status.
Solution Approach 2:
The system dynamically adjusts transmission parameters based on real-time resource usage indications. When a UE receives information about another UE's intended resource usage, it can dynamically modify its own transmission parameters (such as power levels, timing, or modulation schemes) to optimize performance and reduce interference in the shared resource environment.
2Device complexity
If resource allocation is made without indication of usage status, then system complexity is reduced, but uplink block error rate increases
Solution Approach 1:
The patent introduces an intermediary message mechanism (resource usage indication message) that carries information about intended resource usage between UEs. This intermediary layer provides necessary reliability information without fundamentally changing the core resource allocation architecture, thus improving uplink block error rate while maintaining relatively simple system complexity.
3Speed
If UEs transmit without knowing neighboring UE's resource usage intention, then communication speed is maintained, but interference management becomes suboptimal
Solution Approach 1:
The system performs preliminary action by having UEs exchange resource usage indication messages before actual transmission occurs. This advance information exchange allows UEs to pre-adjust their transmission parameters, optimizing interference management while maintaining communication speed. The preliminary coordination prevents interference issues from arising during transmission.
Data Source
AI summary
Aspects relate to communicating an indication of whether a user equipment (UE) will use an allocated shared resource. A first UE may output an indication of whether it will use a resource (e.g., a configured grant occasion) of a set of resources that are allocated for the first UE and at least one other UE. A first UE may select a communication mode for transmission via a resource based on an obtained indication of whether a second UE will use the resource. A network entity may output a groupcast message that indicates whether a particular UE will use a resource of a set of resources that are allocated for a plurality of UEs. A first UE may select a communication mode for transmission via a resource based on a groupcast message obtained from a network entity.