Erasure Encoding Pattern for Wireless Uplink Reliability
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Solution Overview
Problem
Wireless communication systems face challenges in ensuring the reliability of uplink and downlink transmissions due to missed packets and increased latency, particularly in low-latency communications like XR traffic, where retransmissions may not be feasible within the packet delay budget, leading to inefficiencies and system latency.
Innovation Solution
The implementation of advanced erasure coding techniques, including the determination and signaling of erasure encoding patterns, which define the location and content of encoded transmissions, allowing for increased reliability by reducing retransmissions and improving decoding capabilities at the receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional transmission methods are used, then system complexity is low, but reliability of packet data units deteriorates due to missed packets and latency
Solution Approach 1:
The transmission data is divided into multiple transport blocks, and erasure coding is applied to generate parity information for these segmented blocks. This segmentation allows the system to apply error correction codes to specific portions of data, improving reliability without requiring complex encoding of the entire data stream.
Solution Approach 2:
Erasure coding is performed in advance on the transport blocks to generate parity information before transmission. This preliminary encoding action ensures that even if some packets are missed during transmission, the receiving device can recover the original data using the pre-generated parity information, thereby improving reliability without adding complexity to the transmission protocol.
2Reliability
If retransmissions are implemented to improve reliability, then reliability of packet data units improves, but latency increases which is unacceptable for low-latency communications
Solution Approach 1:
The system applies erasure coding to generate redundant parity information in advance, creating a cushion against potential packet losses. This beforehand cushioning allows the receiving device to recover from missed packets without requiring retransmissions, thereby maintaining reliability while avoiding the latency penalty associated with retransmission protocols.
3Reliability
If erasure coding is applied to all transmissions, then reliability improves, but use of energy increases due to additional processing and transmission overhead
Solution Approach 1:
Instead of applying erasure coding uniformly to all transmissions, the system applies coding selectively based on the importance and characteristics of different transport blocks. This local quality approach allows the system to improve reliability for critical data while minimizing energy consumption for less critical transmissions, achieving a balance between reliability and energy efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications support advanced coding for uplink and downlink transmissions are described. A user equipment (UE) may receive, from a network entity, control signaling indicating an erasure encoding pattern information associated with an erasure encoding scheme supported by the UE, and may receive scheduling information that allocates multiple resources on a shared channel for communication with the network entity. The UE and network entity may transmit or receive multiple transport blocks (TBs) and erasure encoded parity information corresponding to the multiple TBs via the multiple resources on the shared channel according to an erasure encoding pattern in accordance with the erasure encoding pattern information.