Group TPC Control for Sidelink Interference Reduction
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Solution Overview
Problem
Wireless communication networks face interference challenges that degrade performance, particularly in sidelink communications, due to increasing demand for mobile broadband access and diverse wireless deployments, which affect latency and reliability requirements for devices like Industrial Internet of Things (IIoT) devices.
Innovation Solution
The technology enables group transmit power control (TPC) information to be transmitted via a single sidelink control transmission, allowing for efficient power adjustment across multiple user equipment (UE) sidelinks, reducing interference and improving reliability by using group TPC commands within sidelink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual TPC commands are transmitted to each UE in a group, then power control precision is improved, but control overhead increases significantly
Solution Approach 1:
The patent combines multiple individual TPC commands into a single group TPC command that can be transmitted to multiple UEs simultaneously. The group TPC command includes a group identifier and power control adjustments that apply to all UEs in the group, thereby reducing control overhead while maintaining power control functionality.
Solution Approach 2:
The group TPC command structure is designed to serve multiple UEs with similar channel conditions simultaneously. By creating a universal command format that can be applied to groups of UEs rather than individual UEs, the system reduces the quantity of control information while maintaining effective power control for group members.
2Reliability
If transmit power is increased to improve reliability, then communication reliability is improved, but interference to other UEs increases
Solution Approach 1:
The patent implements a feedback mechanism where UEs report channel conditions and power control adjustments are made based on received signal quality measurements. This closed-loop approach allows the system to increase power only when and where needed to maintain reliability, rather than uniformly increasing power across all UEs, thereby minimizing interference.
Solution Approach 2:
The system applies differentiated power control adjustments to different UEs or UE groups based on their specific channel conditions. UEs experiencing poor signal quality receive larger power adjustments while UEs with good signal quality receive smaller adjustments or no adjustments, thereby maintaining reliability for struggling UEs without unnecessarily increasing interference from UEs that already have good connectivity.
3Reliability
If more TPC commands are transmitted to ensure reliable power control, then power control reliability is improved, but latency increases
Solution Approach 1:
By combining multiple TPC commands into a single group TPC command, the patent reduces the number of transmission opportunities needed to deliver power control information to group members. This consolidation maintains power control reliability for all group members simultaneously while reducing the time delay associated with multiple separate command transmissions.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support controlling transmit power of one or more groups of user equipment (UE) sidelinks using a single sidelink control transmission of group transmit power control (TPC) information. A first UE may transmit group TPC information to one or more groups of UEs, such as by including the group TPC information in sidelink control information (SCI). The group TPC information may include a group TPC indicator and one or more TPC messages for providing one or more group TPC commands with respect to groups of sidelinks. The group TPC commands may provide for power control with respect to a respective group of UEs for one or more channels. Other aspects and features are also claimed and described.