Multicast Video Handoff Latency Reduction via Pre-subscription
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Solution Overview
Problem
Current wireless communication systems experience significant latency and packet loss during handoffs of mobile video traffic due to the time-consuming process of setting up new data paths and potential packet loss during the transition.
Innovation Solution
The system preemptively subscribes to and caches multicast video streams predicted to be necessary for mobile devices transitioning between regions, reducing latency by setting up data paths before the handoff is complete and minimizing packet loss through caching of data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the system waits for handoff completion before subscribing to video streams, then resource utilization is optimized, but data path setup latency increases
Solution Approach 1:
The system performs preliminary actions by requesting subscription information from the source gateway and pre-subscribing to multicast video streams before the handoff is complete. This allows the target gateway to have video streams ready when the mobile device arrives, significantly reducing data path setup latency during handoff transitions.
2Reliability
If the system subscribes to all multicast video streams, then video continuity is ensured, but network resource consumption increases
Solution Approach 1:
The system applies partial action by selectively subscribing to only those multicast video streams that are actually needed based on the mobile device's subscription information. The target gateway receives subscription information from the source gateway and pre-subscribes only to relevant streams, ensuring video continuity while avoiding unnecessary network resource consumption.
3Reliability
If the system performs real-time subscription during handoff, then resource efficiency is maintained, but packet loss increases
Solution Approach 1:
The system performs the subscription action preliminarily, before the handoff completes. The target gateway requests subscription information and subscribes to video streams in advance, ensuring that packets are already available when needed. This eliminates packet loss during handoff while maintaining efficient resource utilization through selective subscription.
Data Source
AI summary
In one embodiment, a system including a memory capable of storing data and a processor is disclosed. The processor is configured for using the data such that the system can request from a source gateway subscription information related to a plurality of multicast video streams subscribed by the source gateway upon receiving a handoff request from a mobile device transitioning from a source region to a target region, wherein the handoff request contains information related to the source gateway. The processor is further configured for using the data such that the system can subscribe to at least a subset of the plurality of multicast video streams before the requested handoff is complete.