Relay UE Resource Allocation for Sidelink Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating resources to multiple source user equipment (UEs) in a hop, leading to interference, increased latency, and reduced reliability in sidelink communications.
Innovation Solution
A user equipment (UE) is configured to transmit resource allocations to multiple source UEs, allowing them to receive data using specific resource allocations, and then forward this data to a destination UE, thereby managing interference and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple source UEs transmit data simultaneously in a hop, then the productivity of sidelink communications is improved, but interference between transmissions increases and reliability deteriorates
Solution Approach 1:
The relay UE segments the resource allocation process by assigning different time-frequency resources to different source UEs. The relay UE receives resource allocation requests from multiple source UEs and distributes orthogonal resources (different time slots, frequency blocks, or code sequences) to each source UE, thereby enabling simultaneous transmissions while avoiding interference and maintaining reliability.
2Quantity of substance
If resource allocations are assigned to multiple source UEs, then the quantity of data transmitted is improved, but the device complexity for managing allocations increases
Solution Approach 1:
The system implements self-service through autonomous resource allocation where the relay UE automatically manages resource distribution based on pre-configured allocation rules and feedback from source UEs. The source UEs autonomously select and report available resources, and the relay UE autonomously assigns resources based on reported channel conditions and quality metrics, reducing the need for complex centralized coordination.
Solution Approach 2:
The resource allocation mechanism incorporates feedback loops where source UEs report channel quality indicators, interference levels, and resource availability to the relay UE. The relay UE uses this feedback information to dynamically adjust and optimize resource allocations, ensuring efficient utilization while maintaining simple management through rule-based decision making.
3Loss of time
If resource allocations are optimized for multiple source UEs, then the loss of time due to retransmissions is reduced, but the use of processing resources increases
Solution Approach 1:
The system performs preliminary resource allocation before actual data transmission occurs. The relay UE pre-assigns orthogonal time-frequency resources to multiple source UEs based on predicted channel conditions and quality requirements. This preliminary action ensures that transmissions are scheduled in advance with appropriate resource separation, preventing collisions and retransmissions while avoiding the need for complex real-time processing during actual data transmission.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a first source UE of two or more source UEs, an indication of a first resource allocation for transmitting first data. The UE may transmit, to a second source UE of the two or more source UEs, an indication of a second resource allocation for transmitting second data. The UE may receive, from the first source UE, the first data using the first resource allocation. The UE may receive, from the second source UE, the second data using the second resource allocation. The UE may transmit the first data and the second data to at least one destination UE. Numerous other aspects are described.