D2D Radio Resource Allocation for Interference Management
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Solution Overview
Problem
In device-to-device (D2D) communication, existing technologies face challenges in efficiently managing radio resources among multiple D2D transmissions, leading to interference when nearby D2D communication pairs share the same resources, and existing methods do not adequately address the interference between cells.
Innovation Solution
A method that dynamically allocates radio resources based on the proximity of D2D communication pairs, allowing non-proximal pairs to reuse resources while preventing proximal pairs from using the same resources, and adjusts resource allocation among multiple cells to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication pairs in different cells share the same radio resources, then spatial reuse of radio resources is improved, but interference between nearby D2D transmissions increases
Solution Approach 1:
The patent applies local quality by dividing radio resources into cell-specific portions and allocating them differently based on local interference conditions. Each cell assigns specific resource portions to D2D communication pairs, and the allocation is adjusted according to the proximity relationship with neighbor cells. This ensures that D2D pairs in proximity use different resources (avoiding interference) while D2D pairs not in proximity can share resources (improving spatial reuse).
Solution Approach 2:
The patent implements dynamic resource allocation where the base station determines the proximity relationship between D2D communication pairs in different cells and dynamically adjusts the resource allocation accordingly. When D2D pairs are detected to be in proximity, their resource allocation is modified to prevent interference. This dynamic adjustment allows the system to adapt to changing spatial relationships and maximize resource reuse while preventing interference.
2Device complexity
If radio resources are allocated autonomously without considering neighbor cells, then resource allocation complexity is reduced, but interference between cells increases
Solution Approach 1:
The patent introduces the base station as an intermediary that coordinates resource allocation between D2D communication pairs in different cells. The base station receives information about D2D pairs, determines their proximity relationships, and allocates resources accordingly. This intermediary approach prevents direct interference between cells while maintaining manageable complexity through centralized control rather than requiring complex distributed coordination protocols.
Data Source
AI summary
A processing apparatus (3A) acquires the number of one or more neighbor cells (31B) to which one or more neighbor-cell D2D radio terminals (2G), located in proximity to a first D2D communication pair (2E) belonging to a first cell (31A), belong. In addition, depending on the acquired number of the one or more neighbor cells (31B), the processing apparatus (3A) determines, from D2D radio resources that are shared among three or more cells (31A, 31B, 31E), a first part allocatable to the first D2D communication pair (2E). It is thus, for example, possible to contribute to efficient use of D2D radio resources shared among at least three cells adjacent to one another.