eMBMS Service Continuity via Frequency Set Segmentation
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Solution Overview
Problem
Existing eMBMS handover methods in LTE systems fail to ensure continuous service and user experience due to the inability to differentiate between different eMBMS services and their frequency sets, leading to potential service interruptions during cell handovers, especially when moving between MBSFN and non-MBSFN regions.
Innovation Solution
The method involves the terminal reporting the eMBMS service frequency set identifier to the source base station, which configures and measures event measurements within the corresponding frequency set, ensuring handover to a cell with the same frequency set, thereby maintaining eMBMS service continuity and improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the eNB performs handover determination based on measurement results without differentiating eMBMS service frequency sets, then the handover process is simple and fast, but the UE may be switched to a non-MBSFN region cell causing eMBMS service interruption
Solution Approach 1:
The frequency sets are segmented into different types (MBSFN and non-MBSFN) with distinct identifiers. The eNB segments the handover decision process by evaluating measurement results separately for each frequency set type, ensuring UEs remain in MBSFN regions when receiving eMBMS services. This segmentation resolves the contradiction by organizing frequency sets into manageable categories that preserve service continuity while maintaining structured complexity.
Solution Approach 2:
The UE performs preliminary actions by reporting MBMSInterestIndication messages that include frequency set information before handover occurs. The eNB uses this advance information to pre-evaluate suitable target cells that match the UE's eMBMS service requirements. This preliminary action allows the network to prepare appropriate handover targets in advance, ensuring service continuity while streamlining the actual handover execution.
2Adaptability or versatility
If the MBMSInterestIndication does not differentiate frequency sets of different eMBMS services, then the signaling is simple, but the eNB cannot perform appropriate processing for different service types during handover
Solution Approach 1:
The solution adds a new dimension to the MBMSInterestIndication signaling by incorporating frequency set type identifiers (MBSFN or non-MBSFN). This dimensional enhancement allows the eNB to differentiate between service types without fundamentally changing the existing signaling structure. The added dimension enables service-specific handover processing while maintaining backward compatibility and minimizing information loss.
Solution Approach 2:
The frequency set differentiation is applied locally to specific frequency sets rather than uniformly across all frequencies. Each frequency set is tagged with its type identifier, allowing the eNB to apply appropriate processing rules locally based on the UE's service requirements. This local quality approach enables precise service-specific handling while keeping the overall signaling framework simple and avoiding unnecessary information overhead.
3Speed
If the UE is switched to a cell in a non-MBSFN region during handover, then the handover can be completed quickly, but the eMBMS service is interrupted
Solution Approach 1:
The system implements feedback mechanisms where the UE continuously reports its receiving state and frequency set information to the eNB. The eNB uses this feedback to monitor UE location relative to MBSFN regions and proactively initiate handovers to appropriate cells before service interruption occurs. This feedback loop enables fast handover execution while maintaining service continuity by keeping the UE within suitable MBSFN coverage areas.
Solution Approach 2:
The handover decision process becomes dynamic by continuously evaluating measurement results against service requirements. The eNB dynamically adjusts handover parameters and target cell selection based on real-time UE mobility patterns and service state. This dynamic approach allows the system to optimize handover timing and target selection, achieving both fast execution speed and maintained service continuity through adaptive decision-making.
Data Source
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AI summary
The disclosure discloses a method for maintaining Enhanced Multimedia Broadcast Multicast Service (eMBMS) service continuity. The method includes the following steps: a terminal transmits an eMBMS service frequency set identifier to a source base station, the eMBMS service frequency set identifier being configured to differentiate frequency sets of different types of eMBMS services; and the terminal performs an event measurement on a frequency set corresponding to the eMBMS service frequency set identifier transmitted by the source base station, and reports a measurement report to the source base station if the event measurement result meets a pre-set condition, the measurement report being configured to complete the determination that the source base station is ensured to perform handover in a cell with the same frequency set corresponding to the current eMBMS service of the terminal. The disclosure also discloses a system, device and computer readable medium for maintaining eMBMS service continuity.