Multicast-Unicast Handoff via Content Gateway
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Solution Overview
Problem
User devices receiving multicast traffic face service disruptions during handoffs between base stations, as many base stations cannot process multicast traffic, leading to inability to receive multicast content when handed off to a station that does not support it.
Innovation Solution
Implementing systems and methods that enable user devices to seamlessly hand off from a base station capable of multicast processing to one that is not, by converting multicast content to unicast and vice versa, allowing continuous content reception and playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a user device receives multicast traffic from a base station and moves to another cell, then the user device can maintain connection with the network through handoff, but the multicast traffic reception is disrupted because the target base station cannot process multicast traffic
Solution Approach 1:
The patent introduces a content gateway as an intermediary component that receives multicast traffic from the core network and converts it to unicast traffic for delivery to user devices. This mediator enables base stations without multicast processing capability to deliver multicast content by receiving unicast streams from the content gateway, thus resolving the contradiction between maintaining service continuity and accommodating base stations with limited multicast capability
Solution Approach 2:
The patent changes the traffic delivery parameter from multicast to unicast at the content gateway. When a user device hands off to a base station that cannot process multicast traffic, the system dynamically switches the delivery mode from multicast to unicast, allowing the same content to be delivered through a different transmission parameter that the target base station can handle
2Reliability
If multicast traffic is converted to unicast traffic to enable handoff to base stations without multicast capability, then service continuity is maintained, but network bandwidth consumption increases
Solution Approach 1:
The system performs preliminary actions by establishing unicast streams from the content gateway to user devices before handoff occurs. The content gateway maintains ready-to-deliver unicast streams for user devices that may hand off to non-multicast-capable base stations, ensuring immediate continuity without requiring real-time conversion during the handoff process
Solution Approach 2:
The content gateway creates unicast copies of multicast content for individual user devices. Instead of requiring the base station to process multicast traffic, the system generates separate unicast stream copies from the content gateway to each user device, enabling delivery through base stations that only support unicast while maintaining content integrity
3Adaptability or versatility
If the system supports both multicast and unicast delivery modes for handoff, then adaptability to different base station capabilities is improved, but system complexity increases
Solution Approach 1:
The content gateway serves as a centralized intermediary that handles all multicast-to-unicast conversion logic, simplifying the overall system architecture. By concentrating the complexity of dual-mode support in a single dedicated component rather than distributing it across multiple base stations, the system achieves high adaptability while managing complexity in a controlled manner
Solution Approach 2:
The patent segments the multicast delivery function into two separate components: the content gateway handles multicast reception and unicast conversion, while base stations handle only unicast delivery to user devices. This segmentation allows each component to be optimized for its specific function, with base stations remaining simple unicast-only devices while the content gateway manages the complexity of capability matching and stream conversion
Data Source
AI summary
A system may receive, from a user device, a request to receive content via a first base station, where the content was previously being received, as multicast content, via a second base station; determine, in response to the request, whether the first base station can process multicast content; transmit a copy of the content, to the user device via the first base station, as multicast content, based on a determination that the first base station can process multicast content; and transmit the content, to the user device via the first base station, as unicast content, based on a determination that the first base station cannot process multicast content.