D2D UE Transmission Mode Switching for Wireless Resource Optimization
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Solution Overview
Problem
Current 3GPP LTE communication systems lack mechanisms for dynamic resource configuration and transmission mode adjustment, particularly in scenarios with poor signal strength, which hinders efficient direct communication between device-to-device (D2D) user equipment (UE) and base stations.
Innovation Solution
The implementation of a D2D UE with a processor, storage, and transceiver that allows for automatic transmission mode adjustment based on transmission conditions and the ability to report signal quality to the base station, enabling dynamic adjustment of resource configuration and transmission modes to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the D2D UE uses scheduled transmission mode with base station coordination, then the transmission reliability is improved, but the system complexity and resource overhead increase
Solution Approach 1:
The patent implements dynamic transmission mode selection where the D2D UE can switch between scheduled transmission mode (with base station coordination) and autonomous transmission mode (without base station coordination) based on radio link status. When radio link failure is detected, the system dynamically transitions from the more reliable but complex scheduled mode to the simpler autonomous mode, resolving the contradiction by making the system adaptable to different operational conditions.
Solution Approach 2:
The patent changes the operational parameters of the transmission system based on detected conditions. Specifically, it monitors radio link status and changes transmission parameters (mode selection, resource allocation) accordingly. This allows the system to optimize between reliability and complexity by adjusting parameters rather than maintaining a fixed complex structure.
2Reliability
If the D2D UE continuously monitors for radio link failure, then the transmission reliability is improved, but the power consumption and processing overhead increase
Solution Approach 1:
The patent implements a self-service mechanism where the D2D UE autonomously detects radio link failure conditions and automatically switches transmission modes without requiring continuous base station coordination or complex monitoring protocols. The system serves itself by making autonomous decisions based on predefined conditions, reducing the energy overhead associated with continuous monitoring and control signaling.
3Productivity
If the base station adjusts resource configuration dynamically, then the resource utilization efficiency is improved, but the control signaling overhead and system complexity increase
Solution Approach 1:
The patent extracts the resource configuration adjustment functionality from the base station and implements it autonomously at the D2D UE level. Instead of the base station continuously adjusting resource configurations through control signaling, the D2D UE independently selects and adjusts transmission modes and resources based on detected radio link conditions. This extraction eliminates the need for extensive control signaling while maintaining resource utilization efficiency.
4Speed
If the D2D UE switches between transmission modes autonomously, then the response speed is improved, but the transmission reliability may deteriorate
Solution Approach 1:
The patent prepares multiple transmission modes and resource configurations in advance before radio link failure occurs. The D2D UE pre-configures both scheduled transmission mode (for normal conditions) and autonomous transmission mode (for failure conditions), along with associated resource allocations. When failure is detected, the system can immediately switch to the pre-prepared autonomous mode without delay, achieving fast response while maintaining reliability through advance preparation.
Data Source
AI summary
A base station and a device to device (D2D) user equipment (UE), a transmission method, a report method and a resource adjustment method for a wireless communication system are provided. When the D2D UE operates as a transmitting end, it is able to determine a transmission mode according to a transmission condition (e.g., whether a radio link failure or a collision occurs when a D2D transmission is being performed, or whether the telecommunication operators of the transmitting end and the corresponding receiving end are the same). When the D2D UE operates as a receiving end, it is able to transmit a report message carrying received signal quality to the base station after receiving D2D data. Accordingly, the base station is able to adjust a D2D resource configuration according to the report message.