Outer Coding for HARQ-Less Configured Grants in XR Uplinks
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Solution Overview
Problem
HARQ-less configured grants in wireless communications for extended reality (XR) traffic result in overly conservative modulation and coding scheme (MCS) choices due to limited modulation and coding scheme updates, leading to inefficient resource utilization.
Innovation Solution
Implementing outer coding for hybrid automatic repeat/request-less configured grants by transmitting systematic and parity code segments during separate CG occasions, allowing for more flexible MCS choices and improved resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-less configured grants are used for XR traffic, then resource utilization efficiency is improved, but modulation and coding scheme choices become overly conservative
Solution Approach 1:
The code is segmented into systematic code segments and parity code segments. Systematic code segments are transmitted in earlier CG occasions while parity code segments are transmitted in later CG occasions. This segmentation allows the network to receive and decode packets progressively, enabling more aggressive MCS choices without sacrificing reliability.
Solution Approach 2:
Systematic code segments are transmitted first in earlier CG occasions before parity code segments. This preliminary transmission of essential data allows the network to begin decoding operations early, reducing the need for conservative MCS choices and improving overall resource utilization efficiency.
2Reliability
If outer coding is applied to packets, then error correction capability is improved, but transmission complexity increases
Solution Approach 1:
The outer code is applied by segmenting the transmission into systematic and parity code segments across multiple CG occasions. This approach distributes the encoding complexity over time and allows the network to process and decode segments progressively, reducing peak complexity requirements while maintaining strong error correction capability.
Solution Approach 2:
The systematic code segments contain sufficient information for the network to perform initial decoding and error correction without requiring all parity segments. This self-service capability allows the system to achieve reliable transmission while distributing complexity management between the transmitter and receiver.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of a set of configured grant (CG) occasions that includes at least a first CG occasion and a second CG occasion, the set of CG occasions comprising uplink resources for periodic uplink transmissions. The UE may transmit a first code segment during the first CG occasion, wherein the first code segment is a systematic code segment representative of a first packet based on application of an outer code to the first packet, the first packet being a most recent packet of a plurality of packets obtained by the UE. The UE may transmit a second code segment during the second CG occasion, wherein the second code segment is a parity code segment that includes parity information based on application of the outer code to unexpired packet(s) of the plurality of packets.