D2D Cross-Link Power Control for Simultaneous Transmission Management
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in managing simultaneous radio transmissions, particularly in scheduling, resource allocation, and power control for uplink and cross-link transmissions, leading to inefficiencies and interference issues.
Innovation Solution
Implementing cross-link power control systems that regulate maximum total transmit power and per-TTI dynamic transmit power for cross-link channels, prioritize power reallocation between uplink and cross-link channels, and manage power headroom reporting based on path loss, signal strength, and interference to ensure efficient power usage and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a device operates simultaneous uplink and cross-link transmissions in parallel, then communication functionality and data throughput are improved, but power management complexity and interference control deteriorate
Solution Approach 1:
The patent implements dynamic power control by adjusting transmit power parameters based on channel conditions, device capabilities, and interference levels. The network configures power control parameters including maximum power limits, power offsets, and scaling factors that are dynamically applied to manage simultaneous transmissions across different links, thereby maintaining high throughput while controlling complexity through standardized parameter adjustment mechanisms
Solution Approach 2:
The system employs feedback mechanisms where the network monitors transmission performance, power consumption, and interference levels from simultaneous uplink and cross-link transmissions. Based on this feedback, the network dynamically adjusts power control parameters and transmission configurations to optimize throughput while managing power complexity, creating a closed-loop control system that adapts to changing conditions
2Reliability
If transmit power is increased for cross-link transmissions, then signal strength and communication reliability are improved, but total power consumption and interference with other links increase
Solution Approach 1:
The patent applies differentiated power control strategies for different transmission links based on their specific requirements and conditions. Each link (uplink, cross-link, sidelink) receives customized power control parameters tailored to its channel characteristics, distance, and interference environment. This localized optimization ensures sufficient signal strength for reliable communication on each link while minimizing unnecessary power consumption and interference generation
Solution Approach 2:
The system converts potential interference from cross-link transmissions into beneficial effects by implementing coordinated power control where interference information from one link is used to optimize power allocation on other links. The network leverages interference measurements and channel state information to dynamically adjust power levels, transforming what would be harmful interference into useful feedback for optimizing overall system performance and reliability
3Use of energy by moving object
If power is reallocated based on priority settings between simultaneous transmissions, then power control efficiency is improved, but scheduling complexity and resource allocation difficulty increase
Solution Approach 1:
The patent segments power control into hierarchical levels: network-configured maximum power limits for each link type, dynamic power offsets adjusted based on channel conditions, and priority-based allocation rules for simultaneous transmissions. This segmentation allows independent optimization of each layer without requiring complex end-to-end scheduling, improving power control efficiency while managing complexity through modular, standardized mechanisms at each segmentation level
Data Source
AI summary
Device-to-device (D2D) cross link power control systems and methods may be disclosed. For example, a device such as a UE or WTRU may determine whether it may have simultaneous transmissions where at least one of the transmissions may include a cross link transmission. The device may further determine whether a total transmit power of the simultaneous transmissions may exceed a maximum transmit power of the device. If the device may have simultaneous transmissions and such transmissions may exceed the maximum transmit power, the device may reallocate power based on a priority or priority setting. The device may further determine a maximum cross link power, a maximum device power, and a cross link transmit power level such that the device may further control the power for transmissions based thereon.