Interference Recognition D2D Resource Allocation
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Solution Overview
Problem
Current device-to-device (D2D) communication methods in cellular systems face challenges in effectively managing interference between D2D and cellular links, particularly in resource allocation, which can degrade D2D communication performance and impact cellular user experience.
Innovation Solution
An interference recognition-based D2D resource allocation method that involves a base station and D2D terminals cooperating to identify and allocate frequency resources, using spectrum sensing to minimize interference by dynamically sharing cellular resources, thereby optimizing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D terminal shares cellular frequency resource to improve frequency efficiency, then frequency efficiency is improved, but interference between D2D terminal and cellular terminal occurs
Solution Approach 1:
The patent applies local quality by allowing different terminals to use different frequency resources based on their specific locations and interference conditions. The base station identifies cellular terminals and allocates frequency resources to D2D terminals such that D2D terminals use frequencies different from nearby cellular terminals, while allowing frequency reuse with distant terminals. This creates locally optimized interference patterns that improve overall frequency efficiency.
Solution Approach 2:
The patent changes the frequency resource parameter dynamically based on interference conditions. The base station receives interference information from D2D terminals, identifies affected cellular terminals, and reallocates frequency resources accordingly. This parameter change approach allows the system to adapt to varying interference conditions and maintain high frequency efficiency while controlling interference.
2Reliability
If base station collects channel information and allocates D2D resource centrally to improve performance, then communication performance is improved, but load of signal process on base station becomes heavy
Solution Approach 1:
The patent segments the resource allocation process into two parts: D2D terminals autonomously perform initial resource selection and measure interference, then report only necessary interference information to the base station. The base station then performs targeted interference identification and coordination with specific cellular terminals. This segmentation reduces the base station's processing load while maintaining effective interference control.
Solution Approach 2:
The patent implements self-service by enabling D2D terminals to autonomously perform resource search, interference measurement, and initial resource selection without extensive base station intervention. The terminals self-manage their resource allocation based on local conditions, reporting only critical interference information to the base station, thereby significantly reducing base station processing requirements.
3Power
If D2D terminal performs distributed resource allocation to reduce base station load, then base station load is reduced, but resource allocation cannot be easily controlled by cellular user requirements
Solution Approach 1:
The patent implements feedback mechanisms where D2D terminals report interference information to the base station, and the base station provides coordination decisions back to D2D terminals. The base station identifies cellular terminals affected by D2D transmission and coordinates frequency resource allocation accordingly. This feedback loop enables the base station to maintain control over resource allocation to meet cellular user requirements while keeping processing load manageable.
Data Source
AI summary
Disclosed herein is an interference recognition-based D2D resource allocation method that uses a base station in a cellular system which includes the base station, a plurality of cellular terminals being in a cell that the base station covers, and a plurality of D2D terminals, including: receiving information of a resource block of a least interference amount that a D2D receiving terminal obtains through resource search and information of search time of the resource search from the D2D receiving terminal; obtaining information of a cellular terminal corresponding to the received resource block and the search time among the plurality of cellular terminals from resource scheduling information storing allocation information of the resource block depending on time per each cellular terminal; and simultaneously allocating frequency resource of the cellular terminal to the D2D receiving terminal and a D2D transmitting terminal by using resource scheduling information corresponding to the obtained cellular terminal.