Mobile Terminal Transmission Rate Control for Inter-RAT Handover
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Solution Overview
Problem
When a mobile terminal performs an Inter-RAT handover from an LTE network with a high transmission rate to a 3G network with a lower transmission rate, the reduced transmission rate causes video data buffering, leading to buffer overflow and video interruptions in the partner terminal.
Innovation Solution
A mobile terminal equipped with a handover determination section, transmission rate control section, and report creation section that changes the transmission rate before a handover, creating a measurement report with updated information and transmitting it to the current base station, ensuring stable data transmission by predicting and adjusting the transmission rate based on reception quality measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal performs Inter-RAT handover from LTE network to 3G network, then the terminal can maintain connection to mobile communication systems with different transmission rates, but the transmission rate is reduced from LTE rate to 3G rate causing buffer overflow and video interruptions
Solution Approach 1:
The terminal predicts the transmission rate of the target base station before handover and proactively adjusts the transmission rate in advance. This preliminary action prevents buffer overflow by ensuring the transmission rate matches the target network's capacity before the handover occurs, thereby maintaining data transmission stability during Inter-RAT handover.
2Speed
If the terminal maintains LTE transmission rate during handover to 3G network, then the terminal can preserve high transmission rate performance, but video data cannot be transmitted and buffer overflow occurs
Solution Approach 1:
The terminal dynamically adjusts the transmission rate based on the predicted transmission rate of the target base station. Instead of maintaining a fixed LTE transmission rate, the system adapts the transmission rate in real-time to match the target network's capabilities, preventing buffer overflow while optimizing data transmission stability during handover.
3Reliability
If the terminal adjusts transmission rate in advance before handover, then buffer overflow and video interruptions are prevented, but additional transmission rate control operations are required
Solution Approach 1:
The terminal obtains predicted transmission rate information from the target base station and uses this feedback to adjust its transmission rate accordingly. This feedback mechanism enables automatic adaptation to the target network's capabilities, maintaining data transmission stability without requiring complex manual control operations.
Data Source
AI summary
A mobile terminal which can be connected to a plurality of base stations with different mobile communication systems, includes a handover determination section that determines a handover execution between cells provided by the plurality of base stations, a transmission rate control section that changes a transmission rate before a handover when the handover execution is determined, and a report creation section that creates a measurement report including information regarding the handover after the transmission rate is changed, and transmits the measurement report to a base station of a cell to which the mobile terminal is currently connected.