D2D Cell Edge Resource Allocation via Segmented Ad-Hoc Coordination
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Solution Overview
Problem
In Device-to-Device (D2D) communication systems, especially in internet-of-vehicles networks, there is a lack of effective resource configuration solutions for inter-eNB scenarios, leading to communication reliability issues at the edge of cells due to resource collisions and inefficient resource allocation, particularly in scenarios with a large number of vehicles.
Innovation Solution
A method and apparatus for allocating cell resources in D2D systems that determine an edge area for resource coordination, allocate resources in a distributed mode, and adjust resources based on interference information and positional data to prevent collisions, allowing nodes in edge areas to access resources in an ad-hoc mode, thereby improving communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same pool of D2D transmit resources is used for different eNBs, then resource allocation is simplified, but resource collisions occur at cell edges leading to communication unreliability
Solution Approach 1:
The patent segments the cell into a central area and an edge area, applying different resource allocation strategies to each segment. The central area uses traditional centralized resource allocation, while the edge area implements a distributed ad-hoc resource allocation mechanism. This segmentation resolves the contradiction by allowing simplified resource pooling in the central area while ensuring reliable communication in the edge area through distributed coordination.
Solution Approach 2:
The patent applies different resource allocation qualities to different spatial locations. In the central area, centralized allocation provides efficient resource utilization, while in the edge area, distributed ad-hoc allocation provides flexibility and collision avoidance. This local differentiation resolves the contradiction between overall simplicity and edge reliability.
2Reliability
If distributed ad-hoc mode is used for resource allocation in edge areas, then communication reliability is improved, but resource coordination complexity between cells increases
Solution Approach 1:
By segmenting the cell into central and edge areas, the patent limits the distributed ad-hoc mechanism only to the edge area where it is most needed. This reduces the overall coordination complexity compared to applying distributed allocation cell-wide, while still achieving improved reliability at the critical edge regions.
Solution Approach 2:
The patent introduces an intermediary mechanism where the eNB provides configuration information about adjacent cell resource pools to UEs in the edge area. This intermediary information enables UEs to perform distributed resource selection with awareness of neighboring cell allocations, reducing coordination complexity while maintaining reliability.
3Device complexity
If centralized resource allocation is used in traditional LTE systems, then resource management is simplified, but real-time interference coordination capability is insufficient
Solution Approach 1:
The patent introduces dynamic resource allocation in the edge area where UEs can autonomously select and adjust resources based on real-time interference conditions and adjacent cell information. This dynamic approach contrasts with the static centralized allocation, providing adaptability to changing interference conditions while maintaining simplified management through the segmented architecture.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report channel state information and interference conditions to the eNB, which then provides updated configuration information about adjacent cell resource pools. This feedback loop enables real-time interference coordination in the edge area while keeping the overall system manageable through selective application of feedback mechanisms.
4Reliability
If resource pools of different cells are made totally different, then resource collisions are avoided, but resource utilization efficiency decreases
Solution Approach 1:
The patent segments resource allocation into centralized (cell-wide) and distributed (edge-area) components. In the centralized portion, resource pools can be efficiently reused across cells, while in the distributed edge portion, UEs autonomously coordinate to avoid collisions. This segmentation enables both high utilization and collision avoidance.
Solution Approach 2:
The patent enables UEs in the edge area to self-manage resource selection and collision avoidance autonomously, without requiring completely different resource pools for each cell. These UEs use distributed coordination mechanisms to independently resolve resource conflicts, allowing cells to reuse the same resource pools efficiently while avoiding collisions through local self-service.
Data Source
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AI summary
Disclosed are a method and device for allocating cell resources of a device to device (D2D) system, which are used for improving the communication reliability of nodes located in different cell edge areas in an edge area ad hoc network manner. Provided is a method for allocating cell resources of a device to device (D2D) system, comprising: determining an edge area for D2D resource coordination of a cell; and allocating a resource pool to a node in the edge area, wherein the node in the edge area selects a resource from the resource pool in an ad hoc manner for communication, the resource being a time slot or time frequency block.