IoV Resource Selection Adjusting RSRP Threshold for Power Differences
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Solution Overview
Problem
In the Internet of Vehicles (IoV) system, the introduction of power control in unicast and multicast transmission modes can lead to incorrect resource selection by terminal devices, causing interference with other devices using low transmission power, due to the large difference in transmission power levels between devices.
Innovation Solution
A resource selection method that involves obtaining a set of candidate resources, excluding unavailable resources based on measured Reference Signal Received Power (RSRP) and an RSRP threshold, and selecting a resource for data transmission, while adjusting the RSRP threshold based on the transmission power difference between devices to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power control is introduced in unicast and multicast transmission modes, then transmission efficiency is improved, but transmission interference increases due to large difference in transmission power levels between devices
Solution Approach 1:
The patent adjusts the RSRP threshold parameter based on transmission power levels. When a terminal device detects that another device is transmitting at a significantly different power level, it dynamically modifies the RSRP threshold to prevent incorrect resource selection. This parameter adaptation resolves the contradiction by maintaining efficient power control while preventing interference from large power differences.
2Device complexity
If terminal devices select resources based on fixed RSRP threshold, then resource selection process is simple, but resource selection accuracy deteriorates due to power control variations
Solution Approach 1:
The patent transforms the static RSRP threshold into a dynamic parameter that adapts to transmission power conditions. The terminal device monitors transmission power levels and adjusts the RSRP threshold accordingly, enabling accurate resource selection despite power control variations while maintaining reasonable system complexity.
3Loss of time
If terminal devices use standard resource selection method, then resource allocation is fast, but transmission reliability deteriorates due to incorrect resource selection causing interference
Solution Approach 1:
The patent performs preliminary assessment of transmission power levels before final resource selection. By evaluating power differences in advance and adjusting the RSRP threshold accordingly, the system prevents incorrect resource selections that would cause interference, thereby improving transmission reliability without significantly increasing resource allocation time.
Data Source
AI summary
A resource selection method in a Device-to-Device (D2D) system, and a terminal device thereof are provided. The method includes: obtaining, by a terminal device, a first set of resources, resources in the first set of resources being candidate transmission resources; performing sensing, by the terminal device, to exclude an unavailable resource from the first set of resources based on measured Reference Signal Received Power (RSRP) on a resource occupied by another transmitting terminal device and an RSRP threshold; and selecting, by the terminal device, a resource from the first set of resources for data transmission.