Network-Controlled Power Control for Side-Link Communications
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Solution Overview
Problem
Wireless communication networks face interference and congestion issues due to increased demand for mobile broadband access, which degrades performance on both downlink and uplink transmissions, especially in scenarios where UEs communicate directly without base station involvement.
Innovation Solution
Implementing a method for network-controlled power control in side-link communications, where UEs receive transmission power configurations to step up their transmission power for side-link channel transmissions, allowing for enhanced acknowledgement status feedback and retransmissions, thereby improving communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs transmit side-link communications without base station involvement, then communication efficiency is improved, but interference and congestion increase
Solution Approach 1:
The base station dynamically adjusts transmission power parameters for side-link communications based on channel conditions and interference levels. The base station configures power control parameters including maximum power, minimum power, and power step sizes, allowing UEs to adapt their transmission power to reduce interference while maintaining communication efficiency.
Solution Approach 2:
The system implements feedback mechanisms where UEs report channel state information, interference measurements, and communication status to the base station. The base station uses this feedback to continuously optimize power control parameters and scheduling decisions, balancing decentralized efficiency with network-wide interference management.
2Reliability
If transmission power is increased for side-link communications, then communication reliability is improved, but interference to other transmissions increases
Solution Approach 1:
The base station applies differentiated power control strategies to different UE pairs based on their specific channel conditions, distance, and traffic requirements. Each UE receives customized power control parameters tailored to its local communication needs, allowing reliable transmission at minimum necessary power levels rather than uniform high power across all side-link communications.
Solution Approach 2:
Transmission power is dynamically adjusted based on real-time channel conditions, interference measurements, and communication status. The base station continuously updates power control parameters and UE transmission power levels adapt to changing conditions, maintaining reliability while minimizing interference when high power is not necessary.
3Adaptability or versatility
If power control is decentralized without base station control, then system autonomy is improved, but coordination and interference management deteriorate
Solution Approach 1:
The base station acts as an intermediary that coordinates side-link communications between UEs. It allocates time-frequency resources, configures power control parameters, and manages interference coordination, allowing UEs to maintain autonomous direct communication while benefiting from centralized network coordination and resource management.
Data Source
AI summary
Network-controlled power control for side-link communications is disclosed. According to the described aspects, a power control framework is defined for network-controlled side-band or device-to-device (D2D) communications, in which transmission power for side-link communications may be stepped up enough for a base station in a connected mode with at least one of multiple user equipment (UE) devices to detect side-link communications between the UEs in order to take responsive action to enhance the reliability of the communications. The base station provides the configuration information to the UEs which may be used when preparing for transmissions of side-link traffic and/or feedback.