Outer Coding Header for Wireless Network Latency
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR, face challenges in maintaining low latency and power consumption due to the need for retransmissions of data packets, which can degrade performance in applications requiring short latency and low power consumption.
Innovation Solution
The implementation of outer coding (OC) with forward error correction (FEC) encoding and decoding, where data packets are segmented into OC symbols and assembled into OC blocks, allowing for efficient error correction without retransmissions by providing metadata for effective decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission mechanism is used to correct packet errors, then reliability is improved, but latency and power consumption increase
Solution Approach 1:
The patent applies forward error correction (FEC) encoding to data packets before transmission, embedding redundant correction data in advance. This preliminary action enables the receiving device to correct errors autonomously without waiting for retransmission requests, thereby reducing latency while maintaining reliability
Solution Approach 2:
The patent introduces an outer coding layer as an intermediary between the application layer and the physical layer. This outer coding layer processes packets into outer coding blocks with embedded correction capabilities, acting as a mediator that enables error correction without requiring interactive retransmission protocols, thus reducing communication latency
2Reliability
If retransmission mechanism is used to correct packet errors, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent enables the receiving device to autonomously correct packet errors using the embedded forward error correction data. This self-service capability eliminates the need for the receiving device to transmit retransmission requests and for the transmitting device to perform additional transmissions, thereby reducing power consumption on both ends while maintaining error correction reliability
3Loss of time
If outer coding is applied to enable error correction without retransmission, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent segments data packets into outer coding blocks with structured organization of information bits and correction bits. This segmentation approach simplifies the error correction process by dividing it into manageable blocks with predetermined structures, making the complexity tractable while enabling fast error correction without retransmission
Solution Approach 2:
The patent modifies the structure of data transmission by changing parameters such as block size, code rate, and encoding schemes. By optimizing these parameters, the system achieves effective error correction with manageable complexity, balancing the trade-off between latency reduction and device complexity
Data Source
AI summary
Aspects presented herein may improve the latency and power consumption for communications by enabling a wireless device to apply outer coding (OC) (with forward error correction (FEC)) to transmission(s). In one aspect, a wireless device segments each packet data convergence protocol (PDCP) packet in a plurality of PDCP packets into a set of OC symbols, where the plurality of PDCP packets corresponds to a packet data unit (PDU) set. The wireless device assembles multiple sets of OC symbols into an OC block. The wireless device applies an FEC encoding to the OC block. The wireless device outputs the OC block based on the FEC encoding. In some examples, the wireless device also adds an OC header to the OC block, where the OC header includes a symbol size, a set of source symbols, and/or a symbol index associated with the FEC encoding.