MBMS Stream Realignment Across Cell Borders and PTP-PTM Switching
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Solution Overview
Problem
Existing wireless communication systems face service interruptions and data loss during transitions between cells or when switching between Point-to-Point (PTP) and Point-to-Multipoint (PTM) transmission modes, due to misalignment and delay in data streams, which affects the Quality of Service for Multimedia Broadcast and Multicast Services (MBMS).
Innovation Solution
The implementation of a Forward Error Correction (FEC) layer above the Radio Link Control (RLC) layer, which utilizes outer-coding techniques to protect user data and maintain sequence numbers across transmission modes, enabling seamless data realignment and recovery during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Point-to-Point (PTP) or Point-to-Multipoint (PTM) transmission is used for MBMS content delivery, then transmission efficiency is improved, but service interruptions and data loss occur during transitions between cells or transmission modes
Solution Approach 1:
The patent applies preliminary action by pre-aligning data streams from multiple cells and transmission modes before transitions occur. The network controller synchronizes the timing and content of MBMS data streams in advance, so that when a mobile station moves between cells or transmission modes, the data streams are already compatible and can be seamlessly switched without interruption or data loss.
2Device complexity
If data streams from different cells are transmitted independently, then device complexity is reduced, but data misalignment and service interruption occur during cell transitions
Solution Approach 1:
The patent merges the data streams from multiple cells at the network controller level before distribution. By combining and synchronizing the MBMS data streams centrally, the system ensures that all cells transmit identical, time-aligned data, eliminating misalignment issues during cell transitions while maintaining relatively simple individual cell configurations.
3Adaptability or versatility
If transmission timing is adjusted for each cell independently, then adaptability to local conditions is improved, but data stream synchronization deteriorates during transitions
Solution Approach 1:
The system performs preliminary synchronization of transmission timing at the network controller before data distribution to individual cells. This pre-alignment ensures that despite any local timing adjustments needed at cell level, the fundamental synchronization is already established, preventing data stream misalignment during transitions.
Data Source
AI summary
Transmission techniques are provided that improve service continuity and reduce interruptions in delivery of content that can be caused by transitions that occur when the User Equipment (UE) moves from one cell to the other, or when the delivery of content changes from a Point-to-Point (PTP) connection to a Point-to-Multipoint (PTM) connection in the same serving cell, and vice-versa. Such transmission techniques enable seamless delivery of content across cell borders and/or between different transmission schemes such as Point-to-Multipoint (PTM) and Point-to-Point (PTP). Mechanisms for adjusting different streams and for recovering content from each data block during such transitions are also provided so that data is not lost during a transition. In addition, mechanisms for realigning data during decoding at a receiving terminal are also provided.