Master eNodeB Mediator for SeNB System Information Synchronization
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Solution Overview
Problem
In dual connectivity mobile communication systems, ensuring frame synchronization between a master eNodeB and a secondary eNodeB is challenging, particularly when they are connected through non-ideal backhaul, which affects the transmission and reception of system information and can lead to performance issues due to mismatched configuration information.
Innovation Solution
A method for a terminal to receive system information from a secondary eNodeB through a master eNodeB, involving the configuration of connections, measurement, and sharing of frame offsets between the master and secondary cell groups to synchronize system information and maintain efficient network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual connectivity is implemented with non-ideal backhaul between MeNB and SeNB, then network capacity and spectrum efficiency are improved, but frame synchronization between MeNB and SeNB deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism where the MeNB acts as a mediator to deliver SeNB system information to the terminal. The MeNB receives system information from the SeNB via backhaul and forwards it through RRC connection reconfiguration messages, bridging the synchronization gap caused by non-ideal backhaul conditions.
Solution Approach 2:
The patent implements preliminary action by having the MeNB pre-process and forward SeNB system information before the terminal needs to use it. The MeNB receives, stores, and prepares the system information in advance, ensuring that when the terminal requires synchronization data, it is already available through the MeNB without requiring direct SeNB-terminal synchronization.
2Productivity
If system information is transmitted directly from SeNB to terminal, then transmission efficiency is improved, but compatibility with existing protocols deteriorates
Solution Approach 1:
The patent applies universality by making the MeNB serve multiple functions: it acts as both a primary base station for control plane operations and as an intermediary for delivering SeNB system information. This multi-functionality allows the existing RRC protocol framework to handle both MeNB and SeNB information delivery without requiring separate protocol mechanisms.
Solution Approach 2:
The MeNB serves as an intermediary that adapts the SeNB's system information format to fit existing RRC protocol structures. By receiving information from SeNB and re-transmitting it through standardized RRC connection reconfiguration messages, the MeNB ensures protocol compatibility while enabling efficient information delivery.
3Measurement precision
If frame offset measurement is implemented between MCG and SCG, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the terminal to autonomously measure frame offsets between MCG and SCG without requiring complex external coordination. The terminal uses its existing capabilities to measure timing differences and report them to the MeNB, which then uses this information for synchronization adjustments without adding significant complexity to the terminal.
Solution Approach 2:
The patent establishes a feedback mechanism where the terminal measures frame offsets and reports them to the MeNB. The MeNB uses this feedback information to adjust synchronization parameters and optimize the dual connectivity performance, creating a closed-loop system that improves synchronization accuracy through iterative measurement and adjustment.
Data Source
AI summary
A method and apparatus of receiving system information of an SeNB, including configuring connection to an MeNB and receiving a RRC Connection Reconfiguration message including the system information of a cell included in a SCG controlled by the SeNB, and a method of sharing frame offset between a MCG controlled by an MeNB and an SCG controlled by an SeNB connected to the MeNB through non-ideal backhaul, including measuring system frame number (SFN) and subframe number (SN) of a cell included in the SCG and sharing the frame offset, which is determined based on the SFN and the SN, with the MeNB or the SeNB are provided.