Outer Coding FEC Layer for Seamless PTP-PTM Broadcast Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing seamless delivery of multimedia broadcast and multicast services across cell borders and between different transmission schemes, leading to service interruptions and data loss during transitions between Point-to-Point (PTP) and Point-to-Multipoint (PTM) connections.
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 independently of the RLC layer, enabling seamless transitions and realignment of data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission methods switch between PTP and PTM across cell borders, then service coverage is improved, but service interruptions and data loss occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring the FEC layer with outer-coding capabilities before transitions occur. The sequence number maintenance mechanism is established in advance, allowing the system to quickly realign data streams during PTP-PTM or cell border transitions without service interruption. This preparatory configuration enables seamless switching between transmission schemes.
Solution Approach 2:
The FEC layer acts as an intermediary between the RLC layer and higher layers, providing sequence number maintenance and data stream realignment capabilities. This intermediate layer buffers and reconciles data from different transmission schemes (PTP and PTM), ensuring continuous service delivery during transitions across cell borders without direct impact on the RLC layer operations.
2Reliability
If outer-coding techniques are implemented above RLC layer, then data protection is improved, but system complexity increases
Solution Approach 1:
The patent segments the error correction functionality by introducing a separate FEC layer above the RLC layer. This segmentation allows outer-coding techniques to operate independently with dedicated sequence number maintenance, protecting user data without complicating the existing RLC layer structure. The modular approach isolates the complexity to a specific layer while maintaining overall system organization.
3Reliability
If sequence numbers are maintained independently in FEC layer, then data stream realignment is improved, but processing overhead increases
Solution Approach 1:
The FEC layer performs self-service by maintaining its own sequence numbers independently without requiring complex coordination with the RLC layer. This self-contained approach allows the FEC layer to autonomously realign data streams during transitions, reducing inter-layer communication overhead and processing time while ensuring accurate data stream reconstruction.
Data Source
AI summary
Transmission techniques are provided that improve service continuity and reduce interruptions in delivery of content that can be caused by techniques that occur when the User Equipment (UE) moves from one cell to the other, or when the delivery of content changes from 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.