Dynamic Resource Selection for D2D Interference Minimization
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Solution Overview
Problem
Direct device-to-device (D2D) communications in cellular networks cause interference due to the sharing of resources, leading to intra-cell and inter-cell interference scenarios not addressed in conventional networks, necessitating a method to minimize or reduce this interference.
Innovation Solution
Selecting either an uplink or downlink resource for D2D communication links based on link quality metrics to minimize interference, considering the impact on both the communicating devices and neighboring cells, ensuring that the selected resource maintains acceptable link quality and reduces interference to other users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication uses the same resources as cellular network (spectral efficiency improvement), then spectral efficiency is improved, but intra-cell and inter-cell interference increases
Solution Approach 1:
The patent implements dynamic resource selection where the D2D communication link adapts its resource usage based on real-time channel conditions and interference levels. The system dynamically switches between using cellular network resources and dedicated D2D resources, and adjusts transmission parameters such as power and modulation schemes to optimize performance while controlling interference. This dynamic adaptation resolves the contradiction by allowing spectral efficiency improvement when conditions permit while preventing excessive interference when conditions deteriorate.
Solution Approach 2:
The patent changes multiple parameters including resource allocation (time-frequency slots), transmission power levels, modulation and coding schemes, and beamforming configurations to balance spectral efficiency and interference. By adjusting these parameters based on channel state information and interference measurements, the system can operate at high spectral efficiency when interference is low, and reduce efficiency when interference becomes problematic, thus resolving the technical contradiction.
2Reliability
If D2D communication link uses downlink resource, then link quality between D2D devices is improved, but interference to other devices using same resource increases
Solution Approach 1:
The patent applies local quality by allowing different parts of the network to use different resources based on their specific conditions. D2D links with good downlink channel conditions can use downlink resources for high reliability, while other links or cells experiencing interference can use uplink resources or dedicated D2D resources. This localized resource allocation resolves the contradiction by optimizing link quality where possible while containing interference locally rather than system-wide.
Solution Approach 2:
The system implements feedback mechanisms where devices report channel quality indicators, interference measurements, and resource utilization status to the network controller. Based on this feedback, the network dynamically adjusts resource allocation and transmission parameters for D2D links. This feedback loop ensures that downlink resources are used for D2D communication only when link quality is sufficiently high and interference to other devices remains acceptable, resolving the technical contradiction.
3Productivity
If resource sharing between cellular and D2D is implemented, then resource utilization is improved, but interference management complexity increases
Solution Approach 1:
The patent segments the resource space into different domains: cellular uplink resources, cellular downlink resources, and dedicated D2D resources. Each segment has specific allocation rules and interference management procedures. This segmentation reduces complexity by avoiding the need to manage all resources uniformly, allowing the system to achieve high resource utilization through flexible allocation across segments while keeping interference management tractable through domain-specific strategies.
Data Source
AI summary
Systems and methods are disclosed for selecting resources for direct device to device (D2D) communications in a cellular communication network. Preferably, resources for the direct D2D communications are selected to minimize, or at least substantially reduce, interference that results from the direct D2D communications in the cellular communication network. In general, either an uplink resource or a downlink resource of the cellular communication network is selected for a direct D2D communication link between a first wireless device and a second wireless device in order to minimize, or at least substantially reduce, interference caused to a third wireless device that uses the same uplink and downlink resources in the same and/or a neighboring cell of the cellular communication network.