D2D Radio Resource Allocation via Base Station Intermediary
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Solution Overview
Problem
In direct-to-device (D2D) communication in mobile systems, there is a need for efficient methods to assign and manage radio resources for user data transmission between terminals without relying on a radio base station, while ensuring reliable acknowledgment and retransmission control mechanisms.
Innovation Solution
The system employs radio terminals that transmit acknowledgment signals to a base station, which calculates the amount of user data received, and uses assigned radio resources for D2D communication, including uplink resources, with retransmission control managed by both terminals and the base station based on acknowledgment signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user data is directly communicated among radio terminals without passing through a radio base station, then communication efficiency is improved, but control and management complexity increases
Solution Approach 1:
The patent introduces a base station as an intermediary that manages D2D communication resources and relays control signals. The base station assigns radio resources for D2D communication, manages acknowledgment signal transmission, and coordinates retransmission control, thereby reducing the control complexity burden on individual terminals while maintaining direct data transmission efficiency
Solution Approach 2:
The patent segments the communication functions into distinct components: direct user data transmission between terminals, separate acknowledgment signal transmission to the base station, and dedicated control signal management. This segmentation allows efficient direct communication while organizing control functions in a manageable structure
2Reliability
If acknowledgment signals are transmitted via the base station in D2D communication, then transmission reliability is improved, but communication overhead increases
Solution Approach 1:
The patent makes the base station serve multiple functions: it acts as a resource manager for D2D communication, a relay for acknowledgment signals, and a coordinator for retransmission control. This multi-functionality allows the system to achieve reliable transmission through centralized management without requiring separate dedicated infrastructure for each function
Solution Approach 2:
The patent implements a feedback mechanism where acknowledgment signals are transmitted from receiving terminals to the base station, which then relays them to transmitting terminals. This feedback loop enables reliable transmission confirmation while the base station's intelligent routing minimizes unnecessary overhead by only transmitting acknowledgments when needed
3Productivity
If radio resources are assigned for D2D communication, then resource utilization is improved, but resource allocation complexity increases
Solution Approach 1:
The base station serves as an intermediary that centrally manages radio resource allocation for D2D communication. It assigns uplink radio resources to transmitting terminals and coordinates resource usage to avoid conflicts, thereby improving resource utilization while concentrating allocation complexity in a single managing entity rather than distributing it across multiple terminals
4Reliability
If retransmission control is managed by both terminals and base station, then transmission reliability is improved, but control signal processing increases
Solution Approach 1:
The patent segments retransmission control into two parts: terminal-level acknowledgment signal transmission and base station-level relay and coordination. This segmentation allows reliable retransmission control to be achieved through distributed terminal actions combined with centralized base station management, balancing reliability requirements with controlled processing complexity
Data Source
AI summary
A mobile communication system performs communication of user data directly among a plurality of radio terminals without passing through a radio base station. The communication of user data directly performed among the plurality of radio terminals is performed by using apart of radio resources assigned to the mobile communication system. The plurality of radio terminals comprise: a transmission-side terminal that transmits the user data; and a reception-side terminal that receives the user data. The reception-side terminal transmits to a radio base station in a connected state where a radio connection is established with the reception-side terminal, a transmission acknowledgment signal indicating whether the user data transmitted from the transmission-side terminal has been received.