Inter-UE Coordination Resource Reservation Forwarding
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in resource management and coordination for sidelink communications, leading to inefficiencies and potential interference issues, especially in scenarios like vehicle-to-everything (V2X) communications.
Innovation Solution
The method involves a first UE identifying suitable resources for a subsequent transmission from a second UE and transmitting an inter-UE coordination message alongside the data transmission, which includes an indication of these resources, allowing the second UE to either use or reselect these resources for its transmission, thereby improving resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensing procedures are used for resource detection, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent combines the inter-UE coordination message transmission with the data transmission by transmitting them simultaneously over the same physical channel (PSSCH). This merging eliminates the need for separate sensing procedures, as the coordination information is embedded within the data transmission itself, thereby reducing time loss while maintaining resource detection accuracy.
Solution Approach 2:
The first UE performs resource selection and determines suitable resources for the second UE's subsequent transmission in advance, before the second UE needs to make its resource selection. This preliminary action allows the second UE to directly use the pre-determined resources without performing time-consuming sensing procedures, thus improving productivity while maintaining measurement precision through the embedded coordination information.
2Reliability
If inter-UE coordination messages are transmitted separately from data transmissions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the inter-UE coordination message with the data transmission into a single transmission event over the PSSCH channel. This approach maintains reliability because the coordination information is transmitted with the same reliability guarantees as the data itself, while reducing device complexity by eliminating the need for separate transmission procedures and reducing the number of transmission states the device must manage.
Solution Approach 2:
The PSSCH channel is given multi-functionality by serving both as a data transmission channel and as a channel for inter-UE coordination message transmission. This universal use of the same channel for multiple purposes reduces device complexity by avoiding the need for dedicated coordination channels while maintaining reliability through the established data transmission protocols.
3Ease of operation
If resource reservation is performed without inter-UE coordination, then ease of operation is improved, but object-generated harmful factors increase due to interference
Solution Approach 1:
The first UE acts as an intermediary between the second UE and the shared medium. By selecting resources and providing coordination information to the second UE, the first UE mediates the resource allocation process, ensuring that the second UE chooses resources that avoid interference from hidden nodes. This intermediary approach maintains ease of operation for the second UE while eliminating harmful interference effects.
Solution Approach 2:
The inter-UE coordination message provides feedback from the first UE's perspective on suitable resources for the second UE's transmission. This feedback mechanism allows the second UE to make informed resource selections that account for potential interference issues that the second UE cannot detect on its own, thus reducing harmful factors while maintaining operational simplicity.
Data Source
AI summary
A first UE and at least one second UE are disclosed. The first UE may identify one or more resources that are suitable for a subsequent transmission from at least one second UE. The first UE may transmit to the at least one second UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE. In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission. The at least one second UE may transmit the subsequent transmission via the one or more resources, or may reselect the one or more resources based on the inter-UE coordination message.