RAN Unequal Error Protection for Mixed-QoS MAC PDUs
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Solution Overview
Problem
Existing wireless communication technologies lack effective methods to provide unequal error protection (UEP) for different classes of data, leading to inefficient spectrum utilization and increased errors in signal transmission.
Innovation Solution
Implementing unequal error protection (UEP) by assigning different quality of service (QoS) levels to bit sequences at the physical layer, using techniques such as different cyclic redundancy checks, modulation and coding schemes, and repetition rates, and synchronizing code block sizes based on class information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform error protection is applied to all bit sequences in wireless communication, then implementation simplicity is maintained, but spectrum utilization efficiency deteriorates and error rates increase for critical data
Solution Approach 1:
The patent applies different QoS levels to different bit sequences within the same MAC PDU, allowing critical data bits to receive stronger error protection while less critical bits receive lighter protection. This local differentiation of protection quality resolves the contradiction by optimizing both reliability for critical data and spectrum utilization overall, rather than applying uniform protection to all data equally.
2Reliability
If different QoS levels are applied to different bit sequences, then spectrum utilization and reliability are improved, but physical layer processing complexity increases
Solution Approach 1:
The patent segments bit sequences into different classes (first class and second class) with different QoS requirements, allowing the physical layer to process each class with appropriate protection levels. This segmentation enables targeted error protection strategies that improve overall reliability while managing processing complexity through structured classification rather than ad-hoc handling of each bit sequence.
Solution Approach 2:
The patent performs QoS classification and assigns different protection levels to bit sequences before physical layer processing. By preliminarily categorizing data into different classes with predetermined QoS levels, the system prepares the structure for efficient differential processing, reducing the complexity that would arise from making protection decisions during the actual transmission processing phase.
3Reliability
If all bit sequences receive high error protection, then data reliability is maximized, but spectrum efficiency and transmission speed decrease
Solution Approach 1:
The patent applies high error protection only to critical data bits (first class bit sequences) while using lower protection for less critical bits (second class bit sequences). This localized application of high protection levels maintains transmission speed for non-critical data while ensuring reliability for critical data, resolving the contradiction between maximizing reliability and maintaining transmission speed through differential protection strategies.
Data Source
AI summary
A method for wireless communication by a wireless device includes receiving a first bit sequence and a second bit sequence from an upper layer of a wireless communication protocol stack. The first bit sequence is assigned a first class and the second bit sequence is assigned a second class. The second bit sequence is included in a same medium access control (MAC) packet data unit (PDU) as the first bit sequence. The method also includes processing, at a physical layer, the first bit sequence with a first quality of service (QoS) level, and the second bit sequence with a second QoS level that is different from the first QoS level.