Multicast ARQ Block Segmentation for Transmission Reliability
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Solution Overview
Problem
Current multicast and broadcast services face limitations in transmission reliability, particularly in the media access control layer, leading to potential transmission failures and errors that are not effectively addressed by existing technologies.
Innovation Solution
A transmitting device and method that utilize an encoder to generate parity and automatic repeat request (ARQ) blocks, with a transmitter sending protocol data units (PDUs) to terminals, adjusting retransmissions based on response feedback to ensure error detection and correction in the media access control layer, employing Reed-Solomon encoding for error modification and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ scheme is used in physical layer for multicast and broadcast service, then transmission efficiency is improved, but transmission reliability is limited
Solution Approach 1:
The patent introduces an ARQ mechanism as an intermediary layer between the physical layer HARQ and the application layer. This ARQ block generator creates separate ARQ blocks for data and parity, which are transmitted as distinct PDUs. The receiver can request retransmission of specific lost ARQ blocks, providing enhanced reliability control that HARQ alone cannot achieve.
Solution Approach 2:
The patent segments the transmission into separate data PDUs and parity PDUs at the MAC layer. Data is divided into multiple ARQ blocks that are further segmented into separate transmission units. This segmentation allows selective retransmission of only the lost segments rather than retransmitting entire blocks, improving both reliability and efficiency.
2Reliability
If ARQ blocks are transmitted separately as distinct PDUs, then transmission reliability is improved through selective retransmission, but device complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-generating parity ARQ blocks before transmission. The ARQ block generator creates both data ARQ blocks and parity ARQ blocks in advance, encoding the parity information beforehand. This preliminary encoding simplifies the transmission process and reduces the complexity of error recovery operations at the receiver.
Solution Approach 2:
The patent changes the parameter of transmission units by creating distinct PDU structures for data and parity with different identifiers. Data PDUs contain data ARQ blocks while parity PDUs contain parity ARQ blocks, each with appropriate header information. This parameter differentiation simplifies the receiver's task of identifying and processing different types of blocks.
3Reliability
If Reed-Solomon encoding is used for error detection and correction, then transmission reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial action by using Reed-Solomon encoding only for the parity ARQ blocks rather than encoding all data. The encoder generates parity information for the data blocks, and this parity is transmitted separately. This partial application of error correction reduces the overall encoding complexity while maintaining reliability for the most critical error-prone portions.
Data Source
AI summary
A transmitting device for a multicast and broadcast service according to an embodiment of the present invention includes: an encoder that receives data to generate parity; an ARQ block generator that generates a first automatic repeat request (ARQ) block by dividing the data and generates a second ARQ block by dividing the parity; a PDU generator that generates a first protocol data unit (PDU) including the first ARQ block and a second protocol unit (PDU) including the second ARQ block; and a transmitter that transmits the first PDU and the second PDU to a plurality of terminals.