Multi-TRP PUSCH Scheduling with UL TCI for URLLC Reliability
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Solution Overview
Problem
Existing technologies do not effectively support PUSCH transmission to multiple Transmission/Reception Points (TRPs) with high reliability and reduced latency, particularly for Ultra Reliable Low Latency Communication (URLLC) applications, as they fail to address how to signal the TCI states for multi-TRP based PUSCH transmission with high reliability and reduced latency.
Innovation Solution
The wireless device supports PUSCH transmission targeting multiple TRPs using UL TCI states in UL TCI states in UL DCI, the proposed solution allows PUSCH transmission to be targeted towards multiple TRPs by indicating multiple TCI states, enabling improved reliability and flexibility in beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing technologies are used for PUSCH transmission, then the system maintains backward compatibility, but reliability and latency performance for URLLC applications are insufficient
Solution Approach 1:
The patent segments the PUSCH transmission by indicating multiple TCI states (first and second TCI states) for different transmission occasions. This allows the transmission to be divided into multiple paths or beams, where each occasion uses a different TCI state, thereby improving reliability through diversity while maintaining timely delivery for URLLC applications
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple TCI states and their associated redundancy versions before transmission. The network node prepares the TCI state indications and RV configurations in advance, allowing the UE to quickly switch between different transmission paths without additional processing delay, thus reducing latency while ensuring high reliability
2Adaptability or versatility
If multiple TCI states are indicated for multi-TRP PUSCH transmission, then beam selection flexibility is improved, but signaling complexity increases
Solution Approach 1:
The patent makes the TCI field in DCI format 0_1 multi-functional by enabling it to indicate multiple TCI states for PUSCH transmission when configured appropriately. This single field serves both traditional purposes and the new multi-TRP indication function, avoiding the need for separate signaling mechanisms and thus limiting the increase in signaling complexity while providing enhanced beam selection flexibility
Solution Approach 2:
The patent changes the interpretation and usage of existing DCI parameters rather than introducing entirely new signaling elements. By modifying how the TCI field is used (indicating multiple states instead of a single state) and associating different redundancy versions with different TCI states, the patent achieves flexible beam selection while keeping signaling overhead manageable through parameter reconfiguration rather than addition
Data Source
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AI summary
Systems and methods to support Physical Uplink Shared Channel (PUSCH) multi- Transmission/Reception Point (TRP) scheduling are provided. In some embodiments, the wireless device performs one or more of: obtaining a configuration for Transmission Configuration Indicator (TCI) states for Uplink (UL) PUSCH scheduling; activating/deactivating a subset of configured TCI states). If two TCI states are indicated, the wireless device transmits two different PUSCHs each corresponding to one of the indicated TCI states. If one TCI state is indicated, the wireless device transmits a single PUSCH corresponding to the indicated TCI state. The wireless device maps indicated TCI states to the transmission occasions or actual repetitions is preconfigured via higher layer parameter(s) or is given by a predefined rule. The wireless device applies a Transmitted Precoding Matrix Indicator (TPMI) to transmission occasions or actual repetitions associated with each indicated TCI state based on a signaled value and/or a predefined value.