D2D Resource Selection via Radio Distance and Interference Cancellation
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Solution Overview
Problem
Direct device-to-device (D2D) communications in cellular networks cause interference due to the use of the same resources as cellular communication networks, leading to intra-cell and inter-cell interference issues.
Innovation Solution
Selecting resources for D2D communications based on radio distances between wireless devices and their serving base stations, using downlink resources when devices are close and uplink resources when they are farther, and considering the presence of interference cancellation receivers at base stations and nearby devices to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication links use the same resources as cellular communication network, then spectral efficiency is improved, but intra-cell and inter-cell interference increases
Solution Approach 1:
The patent applies local quality by making the resource allocation decision local to each D2D communication pair based on their specific radio distance from the base station. Devices closer to the base station use downlink resources while farther devices use uplink resources, creating localized resource allocation patterns that reduce interference while maintaining spectral efficiency.
Solution Approach 2:
The patent implements dynamics by making resource allocation dynamic rather than static. The resource selection (uplink or downlink) changes based on the radio distance condition, allowing the system to adapt resource usage to varying channel conditions and device locations, thereby optimizing both spectral efficiency and interference management.
2Object-affected harmful factors
If downlink resource is used for D2D communication when devices are close to base station, then interference to uplink is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent applies parameter changes by using radio distance as a key parameter to determine resource allocation. The system changes the resource assignment based on the measured radio distance parameter, creating a simple yet effective rule-based allocation strategy that reduces uplink interference without requiring complex optimization algorithms.
3Object-affected harmful factors
If uplink resource is used for D2D communication when devices are far from base station, then interference to downlink is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent applies parameter changes by using radio distance as a key parameter to determine resource allocation. The system changes the resource assignment based on the measured radio distance parameter, creating a simple yet effective rule-based allocation strategy that reduces downlink interference without requiring complex optimization algorithms.
Data Source
AI summary
Systems and methods are disclosed for selecting resources for direct device to device (D2D) communications in a cellular communication network. In one embodiment, a downlink resource is selected as a resource for a direct D2D communication link between a first wireless device and a second wireless device if a base station serving each of the first and second wireless devices is equipped with an interference cancellation receiver and both the first and second wireless devices are less than a predefined threshold radio distance from their serving base station. An uplink resource is selected as a resource for the direct D2D communication link if the base station serving each of the first and second wireless devices is equipped with an interference cancellation receiver and at least one of the first and second wireless devices is more than the predefined threshold radio distance from its serving base station.