Raptor-Coded Packet Encoding for Adaptive PHY Error Rate
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Solution Overview
Problem
Current 5G NR standard protocols mandate a fixed PHY layer packet error rate, which constrains coding rate and modulation order, and the ACK/NACK scheme does not leverage the benefits of encoding schemes like raptor codes.
Innovation Solution
Adaptive determination of PHY packet error rate using raptor codes based on SINR, CQI, or MCS, allowing dynamic adjustment of coding rate and modulation order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed PHY layer packet error rate is mandated, then device complexity and protocol simplicity are maintained, but coding rate flexibility and system bandwidth efficiency are constrained
Solution Approach 1:
The patent implements dynamic PHY packet error rate selection where the error rate is no longer fixed but adapts based on channel conditions (SINR, CQI, MCS). The system dynamically adjusts the error rate parameter to match varying wireless channel qualities, enabling optimal coding rate selection and improving overall system efficiency while maintaining protocol simplicity through standardized adaptation mechanisms.
Solution Approach 2:
The patent changes the PHY packet error rate parameter from a fixed value to a dynamically selectable value based on channel conditions. By allowing the error rate parameter to vary according to SINR, CQI, and MCS measurements, the system can adapt coding rates and modulation orders to maximize bandwidth efficiency while maintaining reliable communication across different channel qualities.
2Reliability
If ACK/NACK schemes are used for packet acknowledgment, then transmission reliability is ensured, but system overhead increases and bandwidth efficiency decreases
Solution Approach 1:
The patent extracts the acknowledgment function from the traditional ACK/NACK scheme by leveraging the properties of raptor codes. Since raptor codes are rateless codes that can recover original data from any sufficient subset of encoded packets, the system eliminates the need for explicit ACK/NACK feedback mechanisms. The receiving device can successfully decode data without confirming packet receipt, thereby removing overhead while maintaining reliability through the inherent error correction capabilities of the coding scheme.
Solution Approach 2:
The raptor code-based transmission system is self-sufficient in terms of reliability assurance. The coding scheme inherently provides error correction and data recovery capabilities without requiring external acknowledgment mechanisms. The system serves its own reliability needs through the mathematical properties of the code, eliminating the need for separate ACK/NACK communication channels and reducing overall system overhead.
3Productivity
If coding rate and modulation order are constrained by fixed error rate mandates, then protocol simplicity is maintained, but system bandwidth efficiency and data transmission capacity are reduced
Solution Approach 1:
The patent implements dynamic selection of coding rate and modulation order based on adaptive PHY packet error rate determination. The system continuously monitors channel conditions (SINR, CQI, MCS) and adjusts coding rate and modulation order accordingly, enabling maximum bandwidth efficiency. This dynamic adaptation allows the system to optimize data transmission capacity for each channel condition while maintaining manageable complexity through standardized adaptation procedures.
Solution Approach 2:
The patent enables flexible changes in coding rate and modulation order parameters by removing fixed error rate constraints. The system can now vary these parameters dynamically based on channel quality, allowing higher coding rates and more efficient modulation schemes to be used when channel conditions permit, thereby significantly improving bandwidth efficiency and data transmission capacity without excessive complexity.
Data Source
AI summary
In one aspect of the disclosure, a method of wireless communication performed by a receiving device includes receiving, from a transmitting device, a plurality of encoded packets each including at least one respective physical (PHY) layer symbol. The method includes decoding the plurality of encoded packets based on a raptor code to generate received data. The method also includes determining a signal-to-interference-plus-noise ratio (SINR) associated with receiving the plurality of encoded packets, receiving an indication from the transmitting device, or determining a channel quality indicator (CQI) or a modulation and coding scheme (MCS) associated with receiving the plurality of encoded packets. The method further includes adaptively determining a PHY packet error rate associated with the plurality of encoded packets based on the SINR, the indication, the CQI, or the MCS. Other aspects and features are also claimed and described.