Multicast Connection Triggering for Idle Terminal Data Delivery
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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, 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 to 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
1Loss of energy
If multicast service data is sent through a shared downlink tunnel to multiple terminals, then resource utilization is improved, but terminals in idle or inactive state cannot receive the data due to disconnected communication connections
Solution Approach 1:
The access network device performs preliminary actions by establishing communication connections with terminals in idle or inactive states before multicast data arrives, or buffers the data until connections are established. This ensures that when data needs to be delivered, the communication path is already available, preventing data loss while maintaining efficient resource utilization through shared tunnels.
Solution Approach 2:
The access network device acts as an intermediary between the user plane function and terminals in idle/inactive states. It receives multicast data, manages connection establishment or buffering, and then delivers data to terminals, bridging the gap between efficient shared tunnel transmission and reliable delivery to all terminals regardless of their connection state.
2Reliability
If communication connections are maintained for all terminals to ensure data reception, then data delivery reliability is improved, but system complexity and resource consumption increase
Solution Approach 1:
The system dynamically adapts its behavior based on terminal states. For terminals in connected states, data is delivered directly through the shared tunnel. For terminals in idle or inactive states, the system dynamically establishes connections or buffers data, then delivers when ready. This dynamic approach ensures reliable delivery without maintaining permanent connections for all terminals, reducing overall system complexity.
Solution Approach 2:
Different handling strategies are applied to different terminals based on their local state. Terminals in connected states receive data through the efficient shared tunnel mechanism, while terminals in idle or inactive states receive special handling (connection establishment or buffering). This localized quality approach ensures each terminal receives data reliably while avoiding unnecessary complexity for terminals that don't need it.
3Reliability
If multicast data is buffered at the access network device for terminals in idle state, then data delivery reliability is improved, but data transmission delay increases
Solution Approach 1:
The access network device performs preliminary connection establishment with terminals in idle or inactive states before multicast data arrives. By preparing the communication path in advance, the device eliminates the need to wait for connection establishment after data arrival, thereby reducing buffering time and transmission delay while ensuring reliable delivery.
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.