MBMS Data Recovery via RLC Buffer Comparison in MBSFN
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Solution Overview
Problem
There is a need for a robust system and method to detect and correct missed Multimedia Broadcast and Multicast Service (MBMS) data frames in a Multicast Broadcast Single Frequency Network (MBSFN) due to channel conditions or user equipment operations, which impacts user experience.
Innovation Solution
The method involves storing Service Data Units (SDUs) in Radio Link Control (RLC) buffers from multiple evolved Node B (eNB) areas and comparing data frames to recover missed MBMS data frames, utilizing a SYNC protocol for synchronization across MBSFN areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If MBMS data is transmitted over MBSFN without ARQ or HART, then transmission simplicity is maintained, but data reliability deteriorates due to possible data loss from channel conditions or user equipment operations
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple copies of the same MBMS data in RLC buffers across different MBSFN areas before transmission. When data is missed in one area, the UE can retrieve it from previously stored data in another area, preventing data loss without requiring complex ARQ protocols.
Solution Approach 2:
The patent introduces an intermediary mechanism where multiple MBSFN areas act as redundant sources for the same MBMS data. The UE uses data from one MBSFN area as a backup when data from another area is missed, improving reliability without adding complex error correction protocols.
2Adaptability or versatility
If the UE tunes to other frequencies for measurement operations, then network optimization is enabled, but MBMS data reception reliability deteriorates due to potential data frame loss
Solution Approach 1:
The patent applies preliminary action by having the UE store MBMS data from multiple MBSFN areas in advance before tuning away for measurements. When the UE returns from frequency measurements, it can recover any missed data frames by comparing and selecting the correct data from the stored buffers, maintaining data reliability while enabling frequency optimization.
Solution Approach 2:
The patent provides beforehand cushioning by maintaining redundant copies of MBMS data in RLC buffers across different MBSFN areas. This creates a safety buffer that protects against data loss during UE operations like frequency tuning, allowing the UE to perform measurements without compromising MBMS reception reliability.
3Stability of the object's composition
If data frames are aligned with the start of the multicast channel modification period, then synchronization across MBSFN areas is improved, but the complexity of data frame management increases
Solution Approach 1:
The patent applies periodic action by aligning MBMS data frame transmission with the periodic multicast channel modification period in MBSFN areas. This regular periodic alignment ensures that the same data frames appear at corresponding positions in different MBSFN areas, improving synchronization stability while using the existing periodic channel structure to minimize additional management complexity.
Data Source
AI summary
A system and method for recovering missed Multimedia Broadcast and Multicast Service (MBMS) data frames in a Multicast Broadcast Single Frequency Network (MBSFN) is provided. The method includes storing a first set of Service Data Units (SDUs) in a first Radio Link Control (RLC) buffer, wherein the first set of SDUs is broadcasted using a first set of MBMS data frames from a first eNB, storing a second set of SDUs in a second RLC buffer, wherein the second set of SDUs is broadcasted using a second set of MBMS data frames from a second eNB, and comparing the first set of MBMS data frames associated with the first set of SDUs with the second set of MBMS data frames associated with the second set of SDUs to recover the missed MBMS data frame in the first set of RLC SDUs received from the first eNB.