MBMS Synchronization via Length-Embedded Control Frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the MBMS synchronization protocol, lower layer network elements fail to maintain synchronization with other elements when data packets are lost successively, leading to inconsistent RLC processing and potential interference between cells, as they cannot accurately calculate the length of each lost data packet.
Innovation Solution
The proposed solution involves an upper layer network element sending a synchronization protocol control frame carrying data packet length information of pre-determined data frames, allowing lower layer network elements to perform synchronization recovery processing and maintain consistency even when data packets are lost, by including either the length of each data frame or partial data frames in the control frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lower layer network elements use existing SYNC protocol without data packet length information, then the protocol complexity remains simple, but synchronization reliability deteriorates when data packets are lost successively
Solution Approach 1:
The upper layer network element performs preliminary action by calculating and embedding data packet length information for all data frames in the synchronization sequence into the control frame before transmission. This allows lower layer network elements to proactively recover from packet losses by using the pre-provided length information, eliminating the need for complex interactive recovery protocols and ensuring synchronization reliability even when multiple packets are lost consecutively.
2Manufacturing precision
If lower layer network elements perform RLC processing independently without length information, then processing autonomy is maintained, but manufacturing precision of data packet reconstruction deteriorates
Solution Approach 1:
The control frame provides feedback information (data packet length information) from the upper layer network element to lower layer network elements. This feedback enables accurate reconstruction of lost data packets by providing reference length values, allowing lower layer elements to precisely determine the size and boundaries of lost packets without losing reconstruction accuracy even when multiple packets are lost successively.
3Productivity
If mute processing is performed without accurate length information, then interference between cells is reduced, but productivity of data transmission deteriorates due to excessive muting
Solution Approach 1:
By providing data packet length information in advance through the control frame, the system enables lower layer network elements to accurately identify which specific packets are lost and only perform mute processing for those specific packets. This preliminary information allows selective muting rather than excessive muting, maintaining data transmission productivity while still preventing cell interference from inconsistent virtual packet generation.
Data Source
AI summary
A synchronization processing method for multimedia broadcast multicast service (MBMS), an upper layer network element, and a lower layer network element thereof. The method includes: an upper layer network element sends a synchronization protocol control frame to a lower layer network element, wherein, the synchronization protocol control frame carries the data packet length information of the pre-determined data frame in the synchronization sequence corresponding to the synchronization protocol control frame, and the pre-determined data frame includes at least one of: each data frame, part of a data frame.