Multicast Session Signaling for Idle Terminal Connection Setup
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Solution Overview
Problem
In a 3GPP network, terminals in an idle or inactive state cannot receive multicast service data due to disconnected communication connections with the access network device, leading to incomplete delivery of multicast service data to all terminals in a group.
Innovation Solution
A data transmission method involving session management network elements that trigger the establishment of communication connections between terminals in a preset state and access network devices using notification information, ensuring all terminals receive multicast service data without loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast service data is sent through a downlink tunnel when a terminal is in idle or inactive state, then the terminal cannot receive the data due to disconnected communication connection, but maintaining continuous connection increases energy consumption and system complexity
Solution Approach 1:
The access network device performs preliminary actions by buffering the multicast service data before the terminal is ready to receive it. When the terminal transitions from idle or inactive state to connected state, the buffered data is delivered. This preliminary buffering action ensures data delivery reliability without requiring continuous communication connections, thus avoiding the complexity of maintaining always-on connections.
2Reliability
If the access network device buffers multicast service data for terminals in preset state, then data delivery reliability is improved, but data transmission delay increases
Solution Approach 1:
The access network device dynamically adjusts its behavior based on the terminal's state. When a terminal is in idle or inactive state, the device buffers data. When the terminal transitions to connected state, the device immediately delivers the buffered data. This dynamic state-based approach ensures complete data delivery while minimizing delay by delivering data as soon as the terminal is ready to receive it.
3Reliability
If notification information is sent to trigger connection establishment, then terminals in preset state can receive multicast data, but signaling overhead increases
Solution Approach 1:
The notification information serves multiple functions simultaneously: it triggers connection establishment between the terminal and access network device, and it also serves as an indication for the access network device to deliver buffered multicast service data. This multi-functionality reduces signaling overhead by combining multiple control functions into a single message, ensuring reliable data reception without excessive signaling.
Data Source
AI summary
A data transmission method, an apparatus, and a system, the method including receiving, by a mobility management network element, second information from a session management network element, where the second information is associated with triggering establishment of a communication connection between a first terminal and a first access network device, and where the communication connection is associated with transmitting data of a first multicast service, and sending, by the mobility management network element, fifth information to the first access network device based on the second information, where sending the fifth information causes the first access network device to establish a communication connection to the first terminal according to the fifth information.