Multicast Session Paging for RRC Inactive Service Continuity
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Solution Overview
Problem
Existing 5G mobile communication networks face challenges in maintaining the continuity of multicast/broadcast services when sessions are activated or deactivated, leading to disruptions in data transmission.
Innovation Solution
Implementing a communication method and apparatus that manage PDU sessions by determining their association with multicast sessions and adjusting their status accordingly, ensuring active sessions remain active during handovers and deactivating sessions when not in use to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If PDU session is deactivated to save transmission resources, then resource utilization is improved, but multicast service transmission continuity is disrupted
Solution Approach 1:
The patent implements dynamic state management for PDU sessions by introducing multiple states (active, inactive, released) and transition conditions. The session management function network element dynamically adjusts PDU session states based on multicast service requirements, terminal behavior, and resource conditions, allowing the system to optimize resource utilization while maintaining service continuity through state transitions rather than simple binary active/inactive control
Solution Approach 2:
The patent employs preliminary actions by establishing PDU sessions in advance before multicast services are actually needed. When a terminal indicates interest in a multicast service, the system checks whether a PDU session already exists and can be activated, rather than creating sessions reactively. This preliminary setup ensures that when services need to start, the transmission path is already prepared, maintaining service continuity while avoiding resource waste from frequent session creation and destruction
2Reliability
If PDU session is kept active to ensure multicast service continuity, then service reliability is improved, but transmission resources are wasted
Solution Approach 1:
The system dynamically transitions PDU sessions between active, inactive, and released states based on real-time conditions. When multicast services are not actively being transmitted, sessions transition to inactive or released states to free resources. When services are needed, sessions are activated or re-established. This dynamic state management allows the system to maintain reliability when needed while optimizing resource utilization during idle periods
Solution Approach 2:
The patent changes the parameter of session state from a binary active/inactive model to a multi-state model (active, inactive, released) with different resource allocation levels. Each state has distinct resource consumption characteristics, allowing fine-grained control over resource usage while maintaining service continuity. The system adjusts session parameters based on service requirements, terminal activity, and network conditions
3Loss of energy
If PDU session is deactivated when terminal enters idle state, then resource utilization is improved, but multicast data reception fails on air interface
Solution Approach 1:
The system performs preliminary actions by maintaining PDU sessions in an active or suspended state even when terminals enter idle states, rather than deactivating them immediately. This preliminary maintenance of session state ensures that when multicast data needs to be transmitted on the air interface, the session is already prepared and can receive data without failure. The session is only deactivated after confirming no multicast services are needed and resources can be safely released
Data Source
AI summary
Embodiments of this application disclose a communication method, apparatus, and system. An example communication method includes: receiving, by an access network device from an access and mobility management function network element, information indicating to activate a multicast session corresponding to a multicast service; and sending, by the access network device based on the information, a paging message to a terminal in a radio resource control_inactive (RRC_inactive) state in the multicast session corresponding to the multicast service.