PUSCH Redundancy-Version Mapping for Multi-TRP Reliability
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Solution Overview
Problem
Existing PUSCH enhancement modes in R15 and R16 are not suitable for multi-TRP scenarios, lacking support for multi-TRP transmission to improve reliability and latency in ultra-reliable and low latency communication (URLLC) services.
Innovation Solution
A channel transmission method that determines a mapping relationship between basic redundancy version (RV) sequences and candidate transmission occasions, and repeatedly sends PUSCH data blocks on target transmission occasions using actual RV sequences, supporting multi-TRP transmission by allocating RV parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single TRP PUSCH enhancement mode is used, then device complexity is reduced, but reliability and coverage are insufficient for multi-TRP scenarios
Solution Approach 1:
The patent segments the transmission process by introducing different redundancy version (RV) sequence mapping modes for different transmission occasions. Mode 1 maps RV sequences directly to transmission occasions, while Mode 2 uses cyclic shifting based on TRP indices. This segmentation allows the system to select appropriate complexity levels for single-TRP or multi-TRP scenarios, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The patent implements dynamic adaptability by allowing the terminal to switch between different RV sequence mapping modes based on whether single-TRP or multi-TRP transmission is configured. The network can dynamically indicate which mode to use through DCI signaling, enabling the system to optimize between simplicity and reliability according to current transmission requirements.
2Reliability
If multi-TRP transmission is implemented, then coverage and reliability are improved, but latency increases due to multiple transmission occasions
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple redundancy versions (RV0, RV1, RV2, RV3) and establishing mapping relationships between RV sequences and transmission occasions before actual transmission. This allows the system to quickly select and apply appropriate RV mappings during multi-TRP transmission without real-time computation delays, reducing latency while maintaining reliability improvements from multi-TRP diversity.
3Device complexity
If RV sequences are not properly mapped for multi-TRP, then device complexity is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent changes key parameters by introducing TRP-specific RV sequence mapping where the RV sequence for each TRP is determined by cyclically shifting a base sequence using the TRP index as the shift amount. This parameter transformation allows the system to manage multi-TRP RV sequences systematically through a unified mathematical relationship, reducing management complexity while ensuring proper differentiation between TRPs for reliable transmission.
Data Source
AI summary
A channel transmission method is performed by a terminal, and includes: determining a mapping relationship between at least one basic redundancy version (RV) sequence and a plurality of candidate transmission occasions for sending a physical uplink shared channel (PUSCH); determining an actual RV sequence corresponding to each of the plurality of candidate transmission occasions based on the at least one basic RV sequence; and repeatedly sending a data block of the PUSCH on a plurality of target transmission occasions respectively based on actual RV sequences corresponding respectively to the plurality of target transmission occasions.