Dual-Connectivity Uplink Threshold Switching for Stable SPS Communication
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Solution Overview
Problem
In dual connectivity (DC) scenarios, the operations of Semi-Persistent Scheduling (SPS) for uplink data transmission when the data amount is smaller than or equal to a Double Reporting and Threshold (DRAT) threshold are not defined, leading to unstable communication operations between the base station and the user equipment.
Innovation Solution
A communication system where the user equipment transmits data directly to a first base station when the data amount exceeds a threshold, and switches to transmitting data to both base stations when the second base station is allocated with periodic resources, ensuring stable communication by adjusting the threshold based on data amount and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment transmits data only to the first base station when data amount is below the threshold, then the transmission path is simple, but the communication operation becomes unstable when the second base station has periodic resources allocated
Solution Approach 1:
The patent applies dynamics by making the transmission threshold dynamic rather than fixed. The threshold is adjusted based on whether the second base station has periodic resources allocated. When periodic resources are allocated to the second base station, the threshold is lowered to enable transmission to both base stations, ensuring stable communication operations under varying resource allocation conditions.
Solution Approach 2:
The patent changes the parameter of the transmission threshold based on the resource allocation status. When the second base station is allocated periodic resources, the threshold parameter is modified to allow transmission to both base stations. This parameter change resolves the contradiction by adapting the transmission behavior to the current system state, ensuring stability without requiring complex fixed-path configurations.
2Reliability
If the threshold is fixed for all data amounts, then the control is simple, but the communication stability deteriorates when periodic resources are allocated to the second base station
Solution Approach 1:
The threshold is transformed from a static fixed value to a dynamic parameter that changes based on the resource allocation status. When periodic resources are allocated to the second base station, the threshold is adjusted to ensure transmission to both base stations. This dynamic adjustment maintains communication stability while adapting to different operational scenarios.
Solution Approach 2:
The system incorporates feedback by monitoring the resource allocation status of the second base station and adjusting the threshold accordingly. This feedback mechanism ensures that the threshold reflects the current system state, maintaining communication stability without requiring overly complex control logic.
3Reliability
If the user equipment transmits data to both base stations when data amount is below the threshold, then communication stability is improved, but the data transmission efficiency decreases due to redundant transmissions
Solution Approach 1:
The system dynamically adjusts the transmission threshold based on the second base station's resource allocation status. When periodic resources are allocated, the threshold is lowered to enable transmission to both base stations, ensuring stability. When periodic resources are not allocated, the threshold remains higher, maintaining transmission efficiency by avoiding redundant transmissions.
Solution Approach 2:
The threshold parameter is changed based on the resource allocation condition. This parameter change allows the system to optimize between stability and efficiency: transmitting to both base stations when stability is needed (periodic resources allocated), and transmitting only to the first base station when efficiency is prioritized (no periodic resources), thus resolving the contradiction between these two objectives.
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.