MBS Link Adaptation Using Dual-Layer Error Correction Feedback
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Solution Overview
Problem
Current methods for improving Multicast Broadcast Service (MBS) quality, such as link adaptation based on MAC FEC and NACK FB information, face inefficiencies due to excessive resource allocation and delayed feedback, leading to reduced frequency use efficiency and suboptimal error correction effects.
Innovation Solution
Implementing a wireless transmission and reception system that employs error correction coding in both the physical layer and a second layer higher than or equal to the physical layer, with identification information added to data units, allowing for accurate feedback and adaptive link adaptation based on error correction results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If link adaptation based on MAC FEC and NACK FB information is employed, then MBS quality is improved, but frequency use efficiency is reduced due to excessive resource allocation
Solution Approach 1:
The transmission block is divided into multiple code blocks, each independently coded with error correction codes. This segmentation allows the system to apply error correction at a granular level, improving reliability for specific blocks without requiring excessive resources for entire transmissions. The segmented approach enables selective retransmission or correction of only affected blocks.
Solution Approach 2:
Error correction codes are applied in advance to data units before transmission. This preliminary encoding prepares the data for potential errors, allowing the receiver to correct errors without requiring additional feedback rounds or retransmissions, thereby improving MBS quality while maintaining frequency use efficiency.
2Reliability
If error correction coding is applied in both physical layer and second layer, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The dual-layer error correction is implemented by segmenting the coding function into physical layer (channel coding) and second layer (MAC layer) coding. Each layer applies appropriate error correction codes suited to its function, creating a structured approach that improves error correction capability while managing complexity through functional separation.
Solution Approach 2:
Identification information is introduced as an intermediary element that links the physical layer and second layer coding structures. This identification information enables the receiver to properly associate and process coded data from both layers, facilitating the complex dual-layer error correction while maintaining manageable system complexity through clear data association.
3Measurement precision
If identification information is added to each data unit, then feedback accuracy is improved, but feedback information overhead increases
Solution Approach 1:
Identification information is extracted and added to each data unit to enable precise tracking and feedback. This extracted identification allows the system to accurately identify which specific data units were successfully received or corrupted, improving feedback accuracy without requiring comprehensive feedback on all transmitted data, thereby managing overhead effectively.
Data Source
AI summary
A wireless reception apparatus (200) for a wireless communication system which transmits, between an MBS transmission apparatus and MBS reception apparatus, multiple transport blocks (TB) coded by error correction coding at the physical layer or at both the physical layer and the data link layer. In the wireless reception apparatus (200), a feedback condition judgment unit (208) transmits feedback information to the MBS transmission apparatus when a reception judgment unit (206) detects errors in L or more TBs out of an N-number of TBs (N is a natural number while L is a natural number less than N) that constitute the beginning portion of any MAC FEC blocks where the beginning TB has been identified. In the wireless communication apparatus (100), the link adaptation unit (114), based on the feedback information from the wireless communication apparatus (200), adjusts the physical layer transmission parameters used for the TBs in the physical layer processing unit.