MME Buffering for Wireless Data Sequence Stability
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Solution Overview
Problem
In wireless communication systems, data sequences buffered in the MME and S-GW can become reversed during mode switching from control plane to user plane, leading to unnecessary operations like packet retransmission and sequence reordering when data reaches the terminal.
Innovation Solution
A method where the MME buffers downlink data during the idle period of the user equipment, transmits it through an initial context setup request message, and uses a Modify bearer request message to configure the S1 bearer, ensuring data is transmitted in the correct sequence by delaying the Modify bearer request until all buffered data is transmitted to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through control plane during idle period, then data can be buffered in MME, but data sequence reversal occurs when switching to user plane
Solution Approach 1:
The MME transmits buffered data to the base station before the mode switch from control plane to user plane is completed. This preliminary transmission ensures that data buffered during idle period is delivered in the correct sequence, preventing sequence reversal at the terminal.
Solution Approach 2:
The patent dynamically adjusts the data transmission path and timing based on the terminal's connection state. During idle period, data is transmitted through control plane via MME; during active period, data is transmitted through user plane via base station. The system dynamically manages the transition between these paths to maintain sequence stability.
2Productivity
If mode switching from control plane to user plane is performed, then data transmission efficiency is improved, but data sequence reversal occurs
Solution Approach 1:
The MME proactively transmits buffered data to the base station before the mode switch is finalized. This preliminary action allows efficient user plane transmission to proceed while ensuring control plane buffered data is already in transit, preventing sequence reversal and maintaining data integrity.
Solution Approach 2:
The base station acts as an intermediary between the MME and the terminal during mode transition. It receives buffered data from the MME and forwards it to the terminal in the correct sequence, coordinating the data flow between control plane and user plane to maintain sequence stability during the efficiency-enhancing mode switch.
3Stability of the object's composition
If buffered data is transmitted through initial context setup request message, then data sequence is maintained, but transmission timing must be precisely controlled
Solution Approach 1:
The base station provides feedback to the MME about the terminal's connection state and data reception status. The MME uses this feedback to determine the optimal timing for transmitting buffered data through the initial context setup request message, automatically adjusting transmission timing to maintain sequence stability without complex manual control.
Solution Approach 2:
The MME autonomously manages the transmission of buffered data by monitoring its own buffering state and automatically initiating transmission through the initial context setup request message when appropriate. This self-service mechanism maintains data sequence stability without requiring external intervention or complex coordination protocols.
Data Source
AI summary
A method for transmitting buffered data of an MME comprises the steps of: performing a CP mode; buffering downlink data, when the downlink data on a terminal is received from an S-GW, during an idle period in which an ECM-idle state of the terminal is maintained; receiving, from the terminal, a service request message for requesting a UP mode; transmitting, to a base station, an initial context setup request message for setting a DRB, and receiving, from the base station, an initial context setup completion message; and transmitting, to the S-GW, a modified bearer request message for setting an S1 bearer between the base station and the S-GW, wherein the buffered data is included in the initial context setup request message and may be transmitted to the base station.