RRC AI Model Transfer Using Split Coding and Selective Retransmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting control channel information and artificial intelligence model information with varying reliability and latency requirements, particularly in 5G networks, where URLLC and eMBB use cases impose different demands on RAN resource loads.
Innovation Solution
A method is introduced where control channel information and AI model information are transmitted using different encoding formats within a radio resource control signal message, with control channel information being transmitted at a higher reliability and AI model information at a lower reliability, allowing for quicker delivery but with potential retransmission of segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control channel information and AI model information are transmitted using the same encoding format, then the transmission structure is simple, but the reliability and latency requirements of different information types cannot be met simultaneously
Solution Approach 1:
The RRC message is segmented into distinct portions: a first portion for control channel information and a second portion for AI model information. Each portion is encoded separately with different encoding formats and rates, allowing independent optimization for their respective reliability and latency requirements while maintaining overall message structure.
Solution Approach 2:
Different encoding formats and rates are applied to different portions of the same RRC message based on their specific requirements. The control channel information portion uses a first encoding format with higher reliability, while the AI model information portion uses a second encoding format with lower latency, achieving local optimization within the unified message structure.
2Reliability
If control channel information is transmitted with high reliability using a lower rate, then the transmission is more reliable, but the transmission time increases
Solution Approach 1:
The message is divided into segments that can be transmitted and decoded independently. The control channel information segment is transmitted with higher reliability encoding, while the AI model information segment uses faster encoding, allowing parallel processing and reducing overall transmission time while maintaining control channel reliability.
3Productivity
If AI model information is transmitted quickly using a higher rate, then the transmission speed increases, but the reliability decreases and retransmission may be needed
Solution Approach 1:
The system implements feedback mechanisms where the receiving device can request retransmission of specific segments of AI model information if decoding fails. This allows the system to maintain high transmission rates while providing a safety net for reliability through selective retransmission based on feedback about received segment quality.
4Reliability
If separate encoding formats are used for control channel information and AI model information, then different reliability and latency requirements are met, but the encoding complexity increases
Solution Approach 1:
The RRC message is segmented into distinct portions with separate encoding formats. The first portion for control channel information uses a first encoding format optimized for reliability, while the second portion for AI model information uses a second encoding format optimized for speed. This segmentation allows independent encoding optimization without requiring complex integrated encoding schemes.
Data Source
AI summary
A radio access network node may determine to update an artificial intelligence machine learning model at a user equipment. The node may transmit the model in a radio resource control message that comprises a primary portion and a secondary portion. The primary portion may be used to transmit control information. The secondary portion may be used to transmit the model, or other data. The control message may comprise a format indication indicative of a code rate to be used by the user equipment to decode the primary portion. The radio resource control message may comprise a secondary format indication indicative of a code rate to be used to decode the secondary portion. A format indication may comprise a retransmission indication indicative of retransmission of one or more segments of either, or both, of the primary portion or secondary portion being enabled.