Packet Data Duplication for Seamless Access Network Transition
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Solution Overview
Problem
When a communication device transitions from one access network to another during a packet-based real-time media session, there is a risk of interrupted communication due to incomplete establishment of the inter-network path, leading to user experience issues.
Innovation Solution
The method involves the first access network transmitting duplicate packet data to the communication device via both networks until the inter-network path is fully established, allowing the device to detect the completion of the transfer and disconnect from the initial network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the communication device immediately disconnects from the first access network upon connecting to the second access network, then the device can transition to the new network, but the inter-network path may not be fully established causing communication interruption
Solution Approach 1:
The first access network transmits duplicate packet data through both the first and second access networks simultaneously before the device disconnects from the first network. This preliminary action ensures that the inter-network path is fully established and duplicate packets are received before the original connection is terminated, preventing communication interruption during network transition
Solution Approach 2:
The system creates a copy of the packet data transmission path by sending duplicate packets through both the first access network and the second access network simultaneously. The communication device receives duplicate packets from both networks, allowing it to verify that the new path is fully established before disconnecting from the original network, thus ensuring communication continuity
2Reliability
If the device waits for the inter-network path to be fully established before disconnecting from the first access network, then communication continuity is maintained, but the transition process is delayed
Solution Approach 1:
The communication device monitors the reception of duplicate packet data from both access networks. When the device detects that duplicate packets are being received through the second access network, it provides feedback that the inter-network path is established and safely disconnects from the first access network. This feedback mechanism enables timely disconnection while ensuring communication continuity
Solution Approach 2:
The system maintains continuous packet data transmission through both access networks simultaneously during the transition period. The first access network continues transmitting packets while the second access network also transmits duplicate packets, ensuring that useful communication action continues without interruption until the device is ready to disconnect from the first network
Data Source
AI summary
As a communication device receives packet data via a first access network, the communication detects that packet data arriving via a second access network is duplicative of the packet data that the communication device is receiving via the first access network. In response to detecting such duplication, the communication device discontinues being served by the first access network and continues with communication via the second access network.