Multicast Configuration via DCI and MCCH in RRC Non-Connected States
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Solution Overview
Problem
Current methods for updating multicast service configurations cannot meet the requirements of terminals in a Radio Resource Control (RRC) non-connected state.
Innovation Solution
A method and apparatus that allow terminals to receive downlink control information (DCI) carrying configuration change indications for multicast services, enabling them to obtain configuration information from a scheduled multicast/broadcast service control channel (MCCH) in an idle or inactive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal uses dedicated RRC signaling to obtain multicast service configuration information, then the configuration can be updated accurately, but the terminal cannot receive multicast services in RRC non-connected state
Solution Approach 1:
The patent applies universality by enabling the MCCH channel to serve dual purposes: traditionally it carried broadcast service configuration, now it also carries multicast service configuration information. This allows the same channel to support both broadcast and multicast services, enabling terminals in RRC non-connected state to receive multicast services without requiring dedicated RRC signaling, thus resolving the contradiction between adaptability and ease of operation
Solution Approach 2:
The patent introduces DCI (Downlink Control Information) as an intermediary mechanism. The DCI carries configuration change indications that trigger terminals to read updated configuration from MCCH. This intermediary allows the network to efficiently notify terminals about configuration changes without establishing dedicated RRC connections, enabling RRC non-connected state multicast reception while maintaining configuration update capability
2Reliability
If the terminal maintains continuous RRC connection to receive multicast service configuration updates, then configuration accuracy is ensured, but system resources are consumed continuously
Solution Approach 1:
The patent implements periodic action through the MCCH channel which is periodically transmitted by the network. Terminals can enter RRC non-connected state and still receive multicast configuration updates by monitoring the periodically transmitted MCCH channel triggered by DCI indications. This periodic transmission mechanism ensures configuration accuracy is maintained while allowing terminals to disconnect, thereby reducing continuous energy consumption and system resource usage
Solution Approach 2:
The patent enables self-service by allowing terminals to autonomously read multicast configuration information from the MCCH channel when triggered by DCI configuration change indications. The terminal independently obtains configuration updates without requiring continuous network interaction or dedicated RRC connection, ensuring configuration reliability while minimizing energy consumption and resource usage
Data Source
AI summary
Provided in the present application are a method of obtaining multicast configuration information and apparatus, and a terminal and a network-side device. The method comprises: a terminal receiving downlink control information (DCI), wherein the DCI carries a configuration change indication of a multicast service; and the terminal acquiring configuration information of the multicast service from a scheduled MCCH according to the configuration change indication.