Mobile Terminal eMBMS Session Stability via Adaptive Cell Reselection
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Solution Overview
Problem
The current 3GPP mobile communication standard does not consider active eMBMS sessions when deciding on neighbor cell measurements or cell reselection, leading to a deterioration in eMBMS reception quality due to the initiation of measurements on incompatible cells, which can terminate active eMBMS sessions.
Innovation Solution
A method where the mobile radio communication terminal device prioritizes cell measurements and reselection based on whether an eMBMS session is active, using different threshold criteria for compatible and incompatible cells to maintain the eMBMS connection by avoiding unnecessary measurements and reselections on incompatible cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs neighbor cell measurements and cell reselection based on serving cell signal power and quality measurements according to the current 3GPP standard, then the terminal can maintain good cellular service quality, but the active eMBMS session may be terminated due to measurements on incompatible cells
Solution Approach 1:
The patent applies local quality by differentiating between compatible and incompatible cells, applying different measurement thresholds and priorities to different cell types. Compatible cells (those providing the desired eMBMS stream) receive lower measurement priority and higher thresholds, while incompatible cells receive higher measurement priority and lower thresholds, allowing the system to maintain eMBMS sessions while still monitoring for necessary cellular service transitions
Solution Approach 2:
The patent implements dynamics by making the measurement behavior adaptive based on the active eMBMS session state. When an eMBMS session is active, the terminal dynamically adjusts measurement thresholds and priorities to preserve the session. When no eMBMS session is active, the terminal reverts to standard measurement behavior, allowing the system to flexibly respond to changing operational conditions
2Ease of operation
If the terminal device initiates neighbor cell measurements when serving cell signal quality falls below thresholds, then the terminal can improve cellular service quality, but the reception quality of the eMBMS stream deteriorates due to measurement gaps
Solution Approach 1:
The patent applies preliminary anti-action by proactively preventing measurement gaps that would harm eMBMS reception. By establishing higher thresholds and lower measurement priorities for compatible cells when an eMBMS session is active, the system preemptively blocks the harmful measurement behavior before it can occur, thus protecting the eMBMS stream quality in advance
Solution Approach 2:
The patent implements preliminary action by pre-configuring different measurement thresholds and priorities based on the eMBMS session state. Before any potential measurement conflict arises, the system has already established the appropriate measurement parameters that will prevent harm to the eMBMS session, ensuring smooth operation without reactive adjustments
3Ease of operation
If the terminal device performs cell reselection to a cell with higher signal power, then the terminal can improve cellular service quality, but the eMBMS connection is terminated by reselecting to an incompatible cell
Solution Approach 1:
The patent applies local quality by assigning different reselection criteria to compatible and incompatible cells. Compatible cells use standard reselection thresholds that allow normal cellular service optimization, while incompatible cells use elevated thresholds that prevent reselection when an eMBMS session is active, thus preserving eMBMS connection stability while still allowing cellular service improvements through compatible cell reselection
Data Source
AI summary
A method for performing mobile communications may include receiving a first multimedia broadcast or multicast stream from a serving cell; determining whether or not a neighbor cell is capable of providing the first multimedia broadcast or multicast stream to generate a first determination result; and initiating neighbor cell protocol operations with the neighbor cell according to a first set of threshold criteria if the first determination result is negative and initiating neighbor cell protocol operations with the neighbor cell according to a second set of threshold criteria if the first determination result is positive. The neighbor cell protocol operations are cell measurements of the neighbor cell or cell reselection to the neighbor cell.