D2D Transmit Power Control via Coverage Ratio Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In device-to-device (D2D) communication, particularly in dedicated short-range communications (DSRC) and intelligent transport systems (ITS), the transmitting device's power setting affects the coverage area and safety of nearby vehicles, with existing methods failing to accurately match actual and expected coverage performance, leading to potential safety issues.
Innovation Solution
A power control method where a network device generates a power adjustment indication message based on the coverage ratio between actual and expected coverage performance, sent to the transmitting D2D device to adjust its transmit power, ensuring actual coverage matches the expected coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transmit power is increased to expand coverage area, then coverage performance is improved, but energy consumption increases and interference to other devices worsens
Solution Approach 1:
The patent implements a feedback mechanism where receiving devices measure the received signal strength from transmitting devices and report this information back to the network device. The network device then adjusts the transmit power of transmitting devices based on this feedback to achieve the desired coverage area while minimizing energy consumption and interference.
Solution Approach 2:
The patent dynamically changes the transmit power parameter of D2D devices based on measured coverage performance and feedback from receiving devices. By adjusting this key parameter, the system optimizes the balance between coverage area, energy consumption, and interference levels.
2Reliability
If transmit power is set high to ensure coverage, then coverage reliability is improved, but actual coverage deviates from expected coverage performance
Solution Approach 1:
The patent uses feedback from receiving devices that measure and report the actual received signal strength. The network device compares this actual coverage performance with the expected coverage performance and adjusts transmit power accordingly, ensuring that actual coverage matches expected coverage while maintaining reliability.
Solution Approach 2:
The patent replaces manual or fixed transmit power setting with an automated control system that uses measured coverage performance data to dynamically adjust power levels, substituting mechanical/fixed power settings with a responsive measurement-and-adjust system.
3Measurement precision
If transmit power is adjusted frequently to match coverage performance, then coverage accuracy is improved, but system complexity increases
Solution Approach 1:
The patent enables receiving devices to autonomously measure the received signal strength and generate feedback reports without requiring complex centralized control. This self-service approach simplifies the overall system complexity while maintaining accurate coverage performance matching through distributed measurement and reporting.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A power control method and a device are provided. A network device generates, according to a coverage ratio of actual coverage performance between a second user direct connection communication device and a first user direct connection communication device to expected coverage performance of the first user direct connection communication device, a power adjustment indication message, and sends the power adjustment indication message to the first user direct connection communication device; and the first user direct connection communication device controls transmit power according to the power adjustment indication message, so that the first user direct connection communication device can appropriately set its transmit power, to make the actual coverage performance of the first user direct connection communication device match the expected coverage performance.