Dual-Connectivity Uplink Routing with Adaptive DRAT Thresholds
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Solution Overview
Problem
In dual connectivity (DC) scenarios, the operations of Semi-Persistent Scheduling (SPS) for uplink split bearers are not clearly defined when the amount of uplink data is smaller than or equal to a Double Reporting and Threshold (DRAT) threshold, leading to unstable communication operations between the base station and the communication terminal.
Innovation Solution
A communication system where the communication terminal device transmits data to a first base station device when the data amount exceeds a threshold, and switches to transmitting only to the first base station when the data is below the threshold, with the threshold adjusted based on periodic radio resource allocation by a second base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the communication terminal device uses DRAT threshold to determine data transmission path, then data transmission efficiency is improved, but communication stability deteriorates when second base station's periodic allocation is active
Solution Approach 1:
The patent applies dynamics by making the DRAT threshold adjustable rather than fixed. The threshold is dynamically modified based on whether the second base station is performing periodic resource allocation, allowing the system to adapt between efficiency mode (higher threshold) and stability mode (lower threshold), thus resolving the contradiction between transmission efficiency and communication stability
Solution Approach 2:
The patent changes the parameter of the DRAT threshold based on the operational state of the second base station. When periodic allocation is detected, the threshold parameter is modified to ensure stable communication, while otherwise it maintains its original value for efficiency optimization, thereby balancing both requirements
2Reliability
If the communication terminal device transmits data to both first and second base stations, then communication reliability is improved, but device complexity increases due to threshold adjustment mechanisms
Solution Approach 1:
The communication terminal device performs self-service by autonomously detecting whether the second base station is performing periodic resource allocation and automatically adjusting the DRAT threshold accordingly. This self-adjusting mechanism eliminates the need for complex external control systems while maintaining high communication reliability through appropriate threshold selection
Data Source
AI summary
A communication system capable of a stable communication operation between a base station device and a communication terminal device. A UE is configured to communicate with an MeNB directly or through a SeNB. The UE is set to transmit, to the MeNB and the SeNB, transmission data addressed to the MeNB when an amount of the transmission data exceeds a predetermined threshold. The UE is set to transmit the transmission data not to the SeNB but to the MeNB when the amount is smaller than or equal to the threshold. The threshold is changed so that the transmission data is transmitted to the MeNB and the SeNB, when the SeNB is set to communicate with the UE with radio resources periodically allocated and the amount of the transmission data is smaller than or equal to the threshold.