Broadcast to Unicast Transition via Content Synchronizer
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Solution Overview
Problem
User equipment (UE) experiences disruption in media content reception when moving out of coverage of base stations participating in a broadcast session, leading to a poor user experience, as the network fails to seamlessly transition from broadcast to unicast communication.
Innovation Solution
A method and system that involves a broadcast server providing a copy of the media session to a packet-data network gateway (PGW), with a content synchronizer tracking participating UEs and broadcast progress, allowing the PGW to establish a unicast bearer and resume media transmission from the point of previous broadcast progress, minimizing interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the network uses broadcast communication for media content delivery, then energy efficiency and network resource utilization are improved, but service continuity and user experience deteriorate when UEs move out of base station coverage areas
Solution Approach 1:
The system dynamically switches the communication mode from broadcast to unicast based on UE mobility status and coverage conditions. When UEs are stationary or within coverage, broadcast mode is used for energy efficiency. When UEs move out of coverage, the system automatically transitions to unicast mode to maintain service continuity, making the communication mode adaptable rather than static.
Solution Approach 2:
The network proactively establishes unicast bearers and prepares unicast transmission paths before the UE completely loses broadcast coverage. The system detects when a UE is moving out of coverage area and pre-configures the unicast connection, ensuring seamless transition without service interruption.
2Reliability
If the network transitions from broadcast to unicast communication, then service continuity for mobile UEs is improved, but network complexity and signaling overhead increase
Solution Approach 1:
The network introduces intermediate control mechanisms including a broadcast server, unicast gateway, and content synchronizer that manage the transition process. These intermediaries handle the complex signaling and coordination required for seamless broadcast-to-unicast switching, isolating the complexity from the core network and making the system more manageable.
Solution Approach 2:
The unicast gateway and content synchronizer serve multiple functions: they manage unicast bearer establishment, track broadcast content delivery status, coordinate the transition timing, and handle both broadcast and unicast transmission protocols. This multi-functionality reduces the need for separate dedicated components for each function.
3Reliability
If the network establishes unicast bearers for all UEs, then service continuity is improved, but network resource consumption and cost increase
Solution Approach 1:
Instead of applying unicast communication uniformly to all UEs, the system applies it locally and selectively only to those UEs that have moved out of broadcast coverage areas. Each UE receives the appropriate communication mode based on its specific location and mobility status, optimizing resource usage while maintaining service continuity where needed.
Solution Approach 2:
The system changes the communication parameter (broadcast vs. unicast) dynamically based on UE position and coverage conditions. When UEs are within coverage, the broadcast parameter is used for efficient resource utilization. When UEs move out of coverage, the parameter switches to unicast mode, allowing flexible adaptation to different operational conditions.
Data Source
AI summary
Disclosed is a method and system to help facilitate transition from broadcast to unicast. A broadcast server provides a copy of session content to a unicast gateway, and a content-synchronizer keeps track of which UEs are broadcast recipients and what the progress of the broadcast is over time. In response to unicast attachment of a UE with the unicast gateway, as when the UE moves from broadcast coverage to unicast coverage, the unicast server determines based on information from the content synchronizer (i) that the UE is a broadcast recipient and (ii) the progress of the broadcast so far. The unicast gateway then begins transmitting to the UE the media content received from the broadcast server, starting at a point in the media content based on the determined progress. This process may thereby help to facilitate a seamless transition from broadcast to unicast, with at most a brief interruption.