Dynamic Reverse Sidelink Traffic Scheduling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in sidelink traffic scheduling, leading to increased control signaling overhead and potential interference due to separate scheduling of sidelink transmissions by base stations for each UE, especially with low-complexity UEs that lack sophisticated traffic understanding.
Innovation Solution
A method where a first UE dynamically schedules reverse sidelink traffic from a second UE by transmitting SCI indicating a set of resources and a reverse sidelink scheduling indicator, allowing the second UE to transmit based on these indications, thereby reducing control signaling and enabling higher-complexity UEs to manage lower-complexity UE transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations separately schedule sidelink transmissions for each UE, then resource allocation is controlled, but control signaling overhead increases
Solution Approach 1:
The patent combines the scheduling of forward and reverse sidelink transmissions into a single SCI message. The first SCI includes both an indicator for forward transmission resources and an indicator for reverse transmission resources, allowing the second UE to determine both directions of communication from one control message rather than requiring separate scheduling messages
2Manufacturing precision
If base stations schedule sidelink transmissions for each UE separately, then resource allocation is precise, but interference increases
Solution Approach 1:
By merging forward and reverse transmission scheduling into one SCI, the system enables coordinated resource selection where the second UE can choose reverse transmission resources that do not conflict with its forward transmission resources or other communications, thereby reducing interference while maintaining allocation precision
Solution Approach 2:
The first SCI provides preliminary indication of both forward and reverse transmission resources to the second UE before actual transmission occurs. This allows the second UE to pre-select reverse transmission resources that avoid interference with forward transmissions and other UEs' communications
3Device complexity
If low-complexity UEs lack sophisticated traffic understanding, then device complexity is reduced, but scheduling efficiency deteriorates
Solution Approach 1:
The first UE acts as an intermediary that receives resource allocation from the base station and translates it into detailed scheduling information for the second UE. The first SCI message serves as a mediator that carries forward transmission indicators and reverse transmission indicators, enabling the low-complexity second UE to efficiently determine both transmission directions without needing sophisticated scheduling algorithms
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may determine a first set of resources for communications over a sidelink communication link between the first UE and a second UE. The first UE may transmit, to the second UE via the sidelink communication link, a first sidelink control information including a reverse sidelink scheduling indicator based on determining the first set of resources. The first UE may additionally transmit, to the second UE via the sidelink communication link, a second sidelink control information indicating a second set of resources for reverse sidelink transmissions from the second UE to the first UE over the sidelink communication link, where transmitting the second sidelink control information is based on transmitting the first sidelink control information. The first UE may receive, from the second UE, a reverse sidelink message in response to transmitting the second sidelink control information.