Multicast Configuration Validity Across Cell Reselection
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE and NR, there is a challenge in maintaining multicast sessions during cell reselection when the multicast configuration is not available on the new serving cell, leading to disruptions in receiving multicast services.
Innovation Solution
A method and apparatus that allows a wireless device to receive a multicast configuration on a first serving cell, perform cell reselection to a second serving cell, and initiate a connection resume procedure to continue the multicast session based on the available multicast configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wireless device performs cell reselection to a second serving cell, then the wireless device can camp on a new cell and maintain mobility, but the multicast configuration may not be available on the second serving cell causing service disruption
Solution Approach 1:
The network configures the wireless device with a validity area for the multicast configuration in advance. This preliminary action allows the device to proactively determine whether the multicast configuration remains valid after cell reselection, enabling quick state transitions without service interruption when moving within the valid area.
Solution Approach 2:
The patent implements dynamic state management where the wireless device can switch between inactive and connected states based on the validity of multicast configuration. When the device moves outside the validity area, it dynamically transitions to connected state to receive updated configuration, ensuring continuous multicast service while maintaining mobility.
2Reliability
If the wireless device initiates connection resume procedure, then the multicast configuration can be updated and service continuity maintained, but additional signaling overhead and processing time are introduced
Solution Approach 1:
The patent applies local quality by creating a validity area specific to multicast configuration. Within this local area, the device can operate in inactive state without needing to resume connection. The validity area concept allows the device to maintain multicast service locally without triggering unnecessary connection resume procedures, reducing signaling overhead and time loss.
3Adaptability or versatility
If the network provides multicast configuration validity area information, then the wireless device can make informed decisions about state transitions, but the network complexity and signaling requirements increase
Solution Approach 1:
The network performs preliminary action by configuring the validity area and multicast configuration together in advance. This preliminary configuration simplifies subsequent device operations, as the device can autonomously determine whether to maintain inactive state or transition to connected state based on pre-provided validity area information, reducing real-time decision complexity.
Data Source
AI summary
A method and apparatus for multicast configuration update is provided. A wireless device receives a multicast configuration for a multicast session, and receives the multicast session based on the multicast configuration on a first serving cell while in an inactive state. After performing a cell reselection to camp on a second serving cell, if the multicast configuration is not available for the second serving cell, the wireless device initiates a connection resume procedure.