D2D Transmit Power Management in Carrier Aggregation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless networks, device-to-device (D2D) communication poses challenges when integrated with carrier aggregation, as UEs need to manage transmit power across multiple carriers to avoid exceeding maximum power limits while ensuring efficient communication between devices and the cellular network.

Innovation Solution

A method where a UE configures its transmit power for D2D and cellular communication to stay within maximum power limits by determining configured maximum output powers based on cell configurations, relative priorities, and guaranteed power thresholds, allowing simultaneous D2D and cellular communication on multiple carriers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a UE engages in D2D communication on multiple component carriers simultaneously, then communication capacity and productivity are improved, but the risk of exceeding maximum transmit power limits increases

Engineering Contradiction:

Improvecommunication capacityVSAvoidpower limit compliance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic power management by continuously monitoring the total transmit power across all component carriers and adjusting individual carrier powers in real-time. The UE determines configured maximum output powers for each component carrier based on overall power constraints, ensuring that the sum of powers on all carriers never exceeds the maximum power limit while allowing flexible power distribution across carriers

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the power parameters of individual component carriers dynamically. By determining configured maximum output powers for each component carrier based on the total power constraint and communication requirements, the system adjusts power levels to maintain compliance with maximum power limits while optimizing communication performance across multiple carriers

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the UE allocates more power to D2D communication, then D2D communication quality is improved, but the power available for cellular communication decreases

Engineering Contradiction:

ImproveD2D communication qualityVSAvoidpower available for cellular communication

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies partial power allocation to D2D communication by determining configured maximum output powers that allocate a portion of the total available power to D2D transmissions on component carriers. This ensures that D2D communication receives sufficient power for reliable operation while maintaining power availability for cellular communications, avoiding complete power dedication to any single function

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2962500B1Method and apparatus for managing transmit power for device-to-device communication

Publication Date: 2018.04.25 GOOGLE TECHNOLOGY HOLDINGS LLC

Figure 1
Figure 2
Figure 3

AI summary

A method and apparatus for managing transmit power for device-to-device communication is provided. According to an embodiment of the invention, a UE (UE1) uses (810) a component carrier of one cell to engage in D2D communication. In parallel with its D2D communication, the UE (UE1) uses (810) one or more other component carriers of one or more other cells to engage in cellular communication. The UE (UE1) configures (806) its D2D transmit power as well as its cellular transmit power so that its total transmit power does not exceed the UEs maximum power limit, and so that the transmit power on a component carrier of a cell does not exceed the maximum power limit for the cell that provides the component carrier.