MBMS Cell Selection for Seamless Mobility
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Solution Overview
Problem
In LTE-Advanced communication networks, mobility management systems often disrupt multimedia broadcast/multicast services (MBMS) when user equipment (UE) is handed over to cells that do not support MBMS, leading to service disruptions for UEs intending to receive MBMS.
Innovation Solution
A method and apparatus for determining UE intentions regarding MBMS service receipt, selecting MBMS-capable cells, and excluding non-capable cells from measurement and selection processes, ensuring seamless handovers and continuous MBMS service by prioritizing MBMS-capable cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobility management systems perform handovers based on general cell selection criteria, then network resource utilization and mobility efficiency are improved, but MBMS service continuity is disrupted when UEs are handed over to non-MBMS-capable cells
Solution Approach 1:
The patent applies local quality by differentiating cell selection criteria based on the specific service requirements. MBMS-capable cells are identified and marked with special capability indicators, allowing the system to apply different selection rules for MBMS services versus regular services. This enables targeted optimization for MBMS continuity without affecting overall network mobility efficiency.
Solution Approach 2:
The system performs preliminary identification of MBMS-capable cells and pre-configures UE with MBMS capability information before handover decisions are made. By determining cell MBMS capability in advance and providing this information to UEs, the system enables UEs to proactively select or be handed over to MBMS-capable cells, preventing service disruption before it occurs.
2Reliability
If the network provides detailed MBMS capability information for all cells to UEs, then MBMS service continuity is ensured, but signaling overhead and network complexity increase
Solution Approach 1:
The patent extracts only the essential MBMS capability information needed for cell selection from the complete cell configuration data. Instead of providing all cell parameters, the system selectively transmits MBMS capability indicators (such as flags or binary indicators) that are sufficient for UEs to make informed cell selection decisions, reducing signaling overhead while maintaining service continuity.
Solution Approach 2:
The system implements partial action by providing only the necessary subset of MBMS-related cell information to UEs. Rather than transmitting complete MBMS configuration details for all cells, the patent uses condensed capability indicators that enable UEs to identify suitable cells without requiring full MBMS parameter sets, thus balancing reliability with reduced complexity.
3Reliability
If UEs continuously monitor all cells for MBMS capability, then MBMS service availability is maximized, but UE power consumption and processing load increase
Solution Approach 1:
The network performs preliminary identification and broadcasting of MBMS-capable cell information before UE cell selection or handover. By providing this capability information in advance through system information blocks or dedicated signaling, UEs can make cell selection decisions without needing to continuously monitor and evaluate all cells for MBMS capability, significantly reducing power consumption while maintaining service availability.
Solution Approach 2:
The system enables UEs to self-determine suitable MBMS cells using the capability indicators provided by the network. UEs autonomously filter and select cells based on the MBMS capability information received, eliminating the need for continuous network-assisted cell evaluation and reducing both UE processing load and power consumption while ensuring MBMS service availability.
Data Source
AI summary
A method of mobility management in a cellular system includes determining from a first received indication that at least one communication device intends to receive a multimedia broadcast multicast service or is receiving a multimedia broadcast multicast service. The information is sent to the at least one communication device relating to at least one multimedia broadcast multicast service capable cell. The method further includes receiving from the at least one communication device a report including measurement information of the at least one multimedia broadcast multicast service capable cell. The method finally includes initiating selecting at least one cell on at least one carrier for the at least one communication device, the at least one carrier including one or more cells capable of providing a multimedia broadcast multicast service.