Wireless Code Block Multiplexing for Interference-Resilient HARQ
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting diverse requirements such as ultra-low transmission latency, ultra-reliable transmission, and multiple spectrum operating modes, particularly in 5G technologies, which are not adequately addressed by legacy systems.
Innovation Solution
The implementation of methods and systems that involve initiating multiple transmissions using overlapping physical layer resources, incorporating cyclic redundancy checks, segmentation, fountain encoding, and multiplexing coded blocks, along with HARQ processing to enhance multiplexing capabilities and improve robustness against interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmissions are initiated using overlapping physical layer resources, then multiplexing capability and resource utilization are improved, but interference between transmissions increases
Solution Approach 1:
The patent segments data blocks into code blocks and further into transport blocks, allowing independent encoding and transmission. This segmentation enables overlapping transmissions to be managed independently, reducing interference impact on overall system performance while maintaining high resource utilization.
Solution Approach 2:
The patent incorporates cyclic redundancy checks (CRC) and error correction codes before transmission. These pre-applied error correction mechanisms cushion against interference by enabling the receiver to detect and correct errors without requiring retransmission, thus maintaining productivity while tolerating overlapping transmissions.
2Reliability
If data blocks are segmented and encoded in multiple stages, then reliability under interference is improved, but processing complexity increases
Solution Approach 1:
The patent divides the encoding process into multiple stages: first stage encoding produces code blocks, second stage encoding produces transport blocks. This segmentation allows complex error correction to be distributed across manageable stages, improving reliability while keeping each stage's complexity manageable.
Solution Approach 2:
The patent implements nested encoding where code blocks from the first stage are fed into the second stage encoding process. This nested structure allows hierarchical error correction where inner and outer codes work together, improving robustness without requiring completely separate complex systems.
3Productivity
If overlapping physical layer resources are used for multiple transmissions, then transmission efficiency is improved, but latency variability increases
Solution Approach 1:
The patent implements HARQ (Hybrid Automatic Repeat Request) mechanisms that provide feedback on transmission success. This feedback allows the system to quickly identify and correct errors without waiting for complete retransmission cycles, reducing latency variability while maintaining high efficiency from overlapping transmissions.
Solution Approach 2:
The patent performs error detection (CRC) and error correction coding before transmission occurs. This preliminary action ensures that even if overlapping transmissions cause interference, the receiver can immediately correct errors without waiting for retransmission, thus reducing latency while maintaining efficiency.
Data Source
AI summary
Methods and systems for operation in a wireless communication system are provided. A WTRU may receive a first transmission of a code block group where one or more code blocks of the code block group are unsuccessfully decoded. The WTRU sends in a bitmap, code block group feedback based on the one or more code blocks of the code block group unsuccessfully decoded and receives control information for a second transmission, in a control channel transmission, where the control information includes an indication that the code block group is in the second transmission, and where the control information includes a new data indicator indicating whether the code block group in the second transmission is for retransmission. The WTRU may then receive the second transmission.