MBMS Synchronization Recovery in MBSFN via Control Frame Markers
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Solution Overview
Problem
In the LTE system, when multiple contiguous synchronous data frames are missed, base stations in the MBSFN region lose synchronization, leading to disrupted MBMS service transmission, affecting user experience during service integration scenarios.
Innovation Solution
Modifying the synchronous control frame structure by adding markers (e.g., Packet Octet Counters) to track the distribution of each synchronous frame, allowing base stations to determine missing data frames and maintain synchronization without halting subsequent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations use traditional synchronous control frame structure without detailed load distribution markers, then the system structure remains simple, but base stations cannot accurately determine missing data frames when synchronization is lost, causing service disruption
Solution Approach 1:
The synchronous control frame pre-contains load distribution markers (Packet Octet Counters) that indicate the data load of each synchronous frame in advance. When base stations lose synchronization, these pre-configured markers enable them to quickly identify missing frames and recover without disrupting subsequent service transmission.
Solution Approach 2:
Load distribution markers serve as intermediary elements between the synchronous control frame and base station decision-making. These markers carry essential information about data frame characteristics, enabling base stations to accurately determine which frames are missing and how to recover synchronization without complex analysis.
2Reliability
If base stations stop sending all continuous MBMS data frames until next synchronous cycle when synchronization is lost, then synchronization can be maintained, but subsequent service transmission is seriously affected
Solution Approach 1:
The synchronous frame sequence is segmented into individual frames with distinct load distribution markers. When synchronization is lost, base stations can identify and handle only the missing segments rather than stopping all transmission, allowing continuous service delivery while recovering synchronization for specific frames.
Solution Approach 2:
The load distribution markers provide feedback information about each synchronous frame's data characteristics. Base stations use this feedback to make informed decisions about which frames to retransmit or skip, enabling selective synchronization recovery that maintains service continuity rather than blanket suspension.
3Loss of information
If traditional synchronous control frames are used without load distribution markers, then the control frame structure remains simple, but base stations cannot determine the number and content of RLC PDUs, affecting synchronization recovery
Solution Approach 1:
The synchronous control frame is enhanced by adding load distribution markers that change and specify key parameters of each data frame (Packet Octet Counters). These parameter changes provide base stations with the necessary information to determine RLC PDU structure and content, enabling accurate synchronization recovery without excessive complexity.
Data Source
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AI summary
A method, a device and a system for synchronizing a Multimedia Broadcast Multicast Service (MBMS) are provided. The method includes: receiving a synchronous control frame from a Broadcast Multicast Service Center (BM-SC) by a network side device, carrying a load condition of a data frame in a synchronous sequence within the synchronous control frame; determining the composing information of the Radio Link Control (RLC) Protocol Data Unit (PDU) according to the load condition of the data frame in a synchronous sequence by the network side device; determining the need of stopping transmitting the missed data frame according to the composing information of the RLC PDU by the network side device while the data frame missing. The method makes the base station falling synchronization in the Multicast Broadcast Single Frequency Network (MBSFN) region recover synchronization in the case of appearing losing synchronous data frames continuously; and does not influence transmitting of the subsequent MBMS service, therefore promotes the feeling of the user receiving the MBMS service in the MBSFN region effectively.