Uplink Shared Channel Repetition Mapping for URLLC
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Solution Overview
Problem
Current wireless communication technologies face challenges in achieving ultra-reliable low-latency communications, particularly in managing orphaned symbol repetitions, transport block size determination, shared channel mapping, and priority of aperiodic sounding reference signals, which affect the efficiency and consistency of uplink shared channel repetitions.
Innovation Solution
The method involves mapping ultra-reliable low-latency communication (URLLC) transmissions to specific symbols for uplink transmission, including orphaned symbol repetition, transport block size determination, shared channel mapping type, and priority of aperiodic sounding reference signal (A-SRS), and transmitting based on these mappings to improve reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink shared channel repetitions are implemented for URLLC transmissions, then reliability is improved, but device complexity increases due to managing orphaned symbol repetitions and mapping configurations
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting mapping configurations based on transmission conditions. Specifically, it changes the mapping type parameter (first mapping type vs. second mapping type) for different repetitions, and adjusts the transport block size parameter based on the number of repetitions and orphaned symbols. This allows the system to optimize reliability through parameter adaptation without requiring complex structural changes to the repetition mechanism itself.
2Reliability
If multiple repetitions of URLLC transmissions are scheduled, then reliability is improved, but latency increases due to handling orphaned symbols and re-mapping requirements
Solution Approach 1:
The patent applies preliminary action by pre-determining the transport block size based on the total number of repetitions and identifying which symbols will be orphaned before transmission begins. The base station预先 configures the mapping parameters and the UE prepares the transmission accordingly. This preliminary calculation and configuration prevents delays that would occur if re-mapping or re-scheduling were needed during the transmission process, thus reducing latency while maintaining reliability through multiple repetitions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may map an ultra-reliable low-latency communication (URLLC) transmission to a set of symbols for uplink transmission, wherein the mapping relates to at least one of an orphaned symbol repetition of the URLLC transmission, a transport block size determination, a shared channel mapping type of a repetition of the URLLC transmission, or a priority of an aperiodic sounding reference signal (A-SRS) of the URLLC transmission. The UE may transmit the URLLC transmission based at least in part on the mapping. Numerous other aspects are provided.