Link Adaptation for Hybrid D2D Cellular Networks
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Solution Overview
Problem
In hybrid D2D and cellular networks, efficiently allocating radio resources and performing link adaptation is challenging due to interference from various sources, including cellular and D2D UEs, which affects communication quality and resource usage efficiency.
Innovation Solution
The method involves receiving resource allocation information and assistance information from a BS, which differentiates resources based on interference sources, allowing D2D UEs to perform link adaptation autonomously and report results for updated resource allocation, thereby improving communication quality and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D UEs share the same communication resources with cellular UEs to enable underlay operation, then resource utilization efficiency is improved, but communication quality deteriorates due to interference from multiple sources
Solution Approach 1:
The patent segments the shared communication resources into different types based on interference sources (cellular UE interference, D2D UE interference, neighboring cell interference). By categorizing resources according to their interference characteristics, the system can apply differentiated link adaptation strategies for each resource type, thereby maintaining high resource utilization while managing interference-induced quality degradation.
2Device complexity
If link adaptation is performed without considering different interference sources, then device complexity is reduced, but measurement precision deteriorates due to inability to accurately assess channel quality
Solution Approach 1:
The base station performs preliminary classification of communication resources into different types based on interference sources before D2D UEs perform link adaptation. This pre-categorization provides D2D UEs with structured assistance information about which resources are affected by which interference types, enabling accurate channel quality assessment without requiring complex interference analysis at the UE side.
3Adaptability or versatility
If autonomous link adaptation is enabled at D2D UEs to improve responsiveness, then adaptability is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The base station acts as an intermediary that provides assistance information to D2D UEs, guiding their autonomous link adaptation decisions. The assistance information includes resource type classifications and interference source identifiers, which simplify the UE's adaptation process by providing pre-analyzed interference characteristics, thereby enabling responsive adaptation without excessive processing complexity at the UE.
Data Source
AI summary
A method, a user equipment, and a base station for link adaptation in a hybrid device-to-device device (D2D) and cellular network are provided. The method comprises receiving, by at least one of two D2D user equipment (UEs) in D2D communication, resource allocation information and assistance information from a base station (BS), wherein the assistance information is used to divide resources conveyed by the resource allocation information into different types based upon correspondingly different interference sources. The method further comprises performing respective link adaptation based upon the respective different types of resources. With the present invention, better high quality communication links can be achieved. Furthermore, resource allocation in the hybrid network could be improved and becomes more efficient over the prior art.