Triangular Inter-UE Coordination for 5G Sidelink Latency
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Solution Overview
Problem
In 5G NR sidelink communications, the current inter-user equipment (UE) coordination mechanism can lead to delays and inefficiencies due to UE's inability to respond to resource allocation requests within the defined latency budget, especially when UEs lack sensing capabilities or resources, causing long delays and poor system efficiency, particularly in safety-critical applications.
Innovation Solution
Implementing a triangular inter-UE coordination scheme where a first UE forwards its request to a second UE if it cannot respond, and modifies the request to include additional information or indicators, allowing a third UE with available resources to respond on behalf of the first UE, thereby reducing delays and enhancing system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a UE forwards its request to another UE when it cannot respond, then the response time is reduced and system efficiency is improved, but the device complexity and coordination overhead increase
Solution Approach 1:
The patent introduces a intermediary UE that acts as a mediator between the requesting UE and the network. When a UE cannot respond within the latency budget, it forwards its request to another UE that can respond on its behalf. This intermediary mechanism resolves the contradiction by enabling timely responses through delegation, thereby reducing coordination delay while managing complexity through structured forwarding protocols and response delegation mechanisms.
Solution Approach 2:
The coordination function is segmented into multiple UEs rather than requiring each UE to independently complete all coordination tasks. The requesting UE segments its coordination burden by forwarding parts of the request to other UEs that have the necessary resources or capabilities. This segmentation allows parallel processing of coordination tasks, reducing overall delay while distributing complexity across multiple devices.
2Measurement precision
If UEs with sensing capabilities are used for coordination, then resource allocation accuracy is improved, but the system requires more capable devices increasing overall system complexity
Solution Approach 1:
The patent applies local quality by allowing different UEs to have different capabilities (some with sensing, some without) and assigning coordination tasks based on local capabilities. UEs with sensing capabilities can provide more accurate resource allocation when needed, while UEs without sensing capabilities can still participate in coordination by forwarding requests or providing basic information. This resolves the contradiction by not requiring all devices to be high-capability, thus maintaining adaptability while enabling accurate resource allocation when available.
Solution Approach 2:
The coordination mechanism is designed to be universal, working with UEs of varying capabilities. The system accommodates both UEs with advanced sensing capabilities and those without, allowing the same coordination framework to function across diverse device types. This universality resolves the contradiction by making the system adaptable to different capability levels while still benefiting from accurate resource allocation when sensing-capable UEs are involved.
3Ease of operation
If the inter-UE coordination procedure follows the current standard, then the protocol simplicity is maintained, but delays occur when UEs lack sensing capabilities or resources
Solution Approach 1:
The patent introduces dynamic behavior to the coordination procedure, allowing UEs to adapt their response strategy based on their current state (whether they have the resources or sensing capabilities to respond). Instead of a static protocol that assumes all UEs can respond, the dynamic mechanism allows UEs to forward requests when unable to respond, thereby maintaining protocol simplicity while improving coordination efficiency through adaptive behavior.
Solution Approach 2:
The coordination mechanism incorporates feedback loops where UEs report their capability status and resource availability. This feedback enables the system to dynamically route coordination requests to appropriate UEs, maintaining protocol simplicity through standardized feedback messages while dramatically improving productivity by ensuring requests are handled by UEs that can actually fulfill them.
Data Source
AI summary
Triangular inter-user equipment coordination for new radio sidelink communications is provided. An exemplary apparatus may include at least one processor, and at least one memory. The memory stores instructions that, when executed by the processor, may cause the apparatus at least to receive, from a first device, a request of inter-user equipment coordination. The apparatus may also be caused to determine at least one second device to which to forward the request. The apparatus may also be caused to modify the request and forward the modified request to the at least one second device for the second device to provide a response to the request to the first device. The request may be modified by an indication related to the forwarding to the at least one second device.