MBMS Service Data Transmission for Seamless Cell Change
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Solution Overview
Problem
In new radio (NR) systems, terminal devices experience poor signal quality at cell edges, leading to failures in receiving multimedia broadcast multicast service (MBMS) during cell changes, and MBMS service data is lost due to misalignment of data between cells and updates in MBMS configuration information.
Innovation Solution
A service data transmission method and apparatus that allows a terminal device to receive MBMS service data from both the current and upcoming cells before a cell change, ensuring seamless data transmission by stopping the reception of the first cell's data after the change, and utilizing secondary service data with a later start time to ensure reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a terminal device receives MBMS service data from only one cell, then the device complexity is reduced, but the reliability of MBMS service data transmission deteriorates at cell edges
Solution Approach 1:
The terminal device performs preliminary actions by receiving and buffering MBMS service data from both the first cell (current cell) and second cell (target cell) before the cell change occurs. This advance preparation ensures that valid MBMS data is already available when the cell change happens, preventing service interruption and improving transmission reliability without significantly increasing device complexity
Solution Approach 2:
The terminal device creates a cushion of redundancy by simultaneously receiving MBMS data from multiple cells before cell change. This cushioning approach ensures that if data from one cell is lost or invalid during transition, data from the other cell serves as a backup, thereby protecting against service failure at cell edges
2Adaptability or versatility
If MBMS configuration information is updated during cell change, then the adaptability of the system is improved, but the loss of MBMS service data increases
Solution Approach 1:
The terminal device obtains MBMS configuration information from both the first cell and second cell before the cell change occurs. This preliminary acquisition ensures that the device has the necessary configuration data from the target cell already available, preventing data loss that would otherwise occur during configuration updates at the moment of cell change
Solution Approach 2:
The terminal device creates a copy of MBMS service data and configuration information from both cells before cell change. By maintaining copies of data from multiple sources, the device ensures that if one source becomes unavailable or its configuration changes, the copied data from the other source prevents information loss
3Productivity
If the terminal device stops receiving MBMS data from the first cell immediately after cell change, then the productivity is improved, but the reliability of MBMS service deteriorates due to potential data misalignment
Solution Approach 1:
The terminal device performs preliminary reception of MBMS data from both cells before cell change, ensuring data alignment and validity. After cell change, it selectively continues receiving from the second cell while stopping from the first cell only when confirmed that the second cell's data is valid and aligned, thereby maintaining both efficiency and reliability
Data Source
AI summary
A service data transmission method includes a terminal device receiving multimedia broadcast multicast service (MBMS) service data of a first cell and MBMS service data of a second cell before a cell change; and the terminal device stopping receiving the MBMS service data of the first cell after the cell change, wherein the first cell is a cell before the cell change, and the second cell is a cell after the cell change.