Centralized D2D Link Management via Base Station Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current device-to-device (D2D) communication technologies face inefficiencies due to continuous neighbor discovery, resource wastage, and lack of centralized control for data exchange decisions, leading to suboptimal use of battery power and bandwidth, especially in opportunistic networks with intermittent connectivity.
Innovation Solution
A method and system utilizing a central controller with knowledge of terminal locations and data exchange needs to manage D2D communication by determining optimal communication links based on proximity graphs and interest graphs, predicting terminal distances, and adjusting communication frequencies to minimize unnecessary interface activation and maximize data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile terminals continuously scan their neighborhood to discover other terminals, then direct communication links can be established, but battery power is consumed and radio link resources are wasted
Solution Approach 1:
The patent applies preliminary action by having mobile terminals report their positions to the base station in advance, and having the base station pre-calculate proximity relationships and communication opportunities. This eliminates the need for continuous scanning by terminals, as the base station proactively identifies and facilitates D2D communications before they are needed.
Solution Approach 2:
The base station serves as an intermediary that coordinates D2D communications. Instead of terminals directly scanning and discovering each other, the base station mediates the process by receiving position reports, determining proximity, selecting appropriate terminals for D2D communication, and managing the resource allocation. This intermediary approach reduces terminal energy consumption while maintaining reliable link establishment.
2Productivity
If mobile terminals exchange lists of available content upon discovery, then data exchange can occur, but control channel resources are consumed instead of being used for actual data transfer
Solution Approach 1:
The patent extracts the content list exchange function from the control channel and moves it to the data channel. By having terminals exchange their content inventories directly as data rather than as control signaling, the control channel remains available for actual data transmission, eliminating the resource waste described in the contradiction.
Solution Approach 2:
The base station performs preliminary selection of terminals that have complementary content needs before establishing D2D links. This pre-screening ensures that when D2D connections are formed, actual data exchange is more likely to occur, maximizing the utility of the control channel resources used for link setup.
3Adaptability or versatility
If purely distributed D2D solutions are used, then no centralized infrastructure is required, but local knowledge limits the effectiveness of communication decisions
Solution Approach 1:
The base station acts as an intermediary that provides global network knowledge to local D2D communications. It receives position and content information from multiple terminals, makes optimized decisions about which terminals should communicate directly, and coordinates these communications. This hybrid approach maintains distributed D2D operation while improving decision effectiveness through centralized coordination.
Solution Approach 2:
The base station performs multiple functions: it serves as a traditional cellular infrastructure element while simultaneously acting as a central coordinator for D2D communications. By integrating these roles, the system achieves both distributed operation capability and improved communication effectiveness through centralized intelligence.
4Productivity
If D2D communication is used to relieve cellular infrastructure, then network load is reduced, but interference management becomes difficult
Solution Approach 1:
The base station serves as an intermediary for interference management by centrally coordinating D2D resource allocation. It assigns specific time-frequency resources to D2D links, monitors interference levels, and adjusts allocations to prevent harmful interference with cellular uplink transmissions. This centralized coordination simplifies interference management compared to fully distributed approaches.
Solution Approach 2:
The system dynamically adjusts D2D communication parameters based on current network conditions. The base station continuously monitors cellular traffic load, interference levels, and terminal positions, and adapts D2D resource allocations in real-time. This dynamic approach allows the system to relieve cellular load when conditions are favorable while managing interference when cellular traffic is heavy.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The invention relates to a method and system for managing data exchanges in a communications network, comprising a centralised entity (20) that is provided, at least, with knowledge of the data exchange requirements between the terminals Mi (21) and their location in the network, in order to control the exchange of messages between the terminals.