Multi-TRP Uplink Collision Handling With TCI-State Prioritization
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Solution Overview
Problem
In multi-transmission-reception point (mTRP) communication scenarios, user equipment (UE) may face uplink (UL) collisions due to simultaneous scheduling of UL communications associated with different transmission configuration indicator (TCI) states that are not capable of simultaneous transmission, leading to decreased network efficiency, increased latency, and higher power usage.
Innovation Solution
Implementing a multi-TRP UL prioritization configuration to determine priorities of colliding UL communications based on channel type, associated TCI state, receiving TRP, timing, and scheduling mechanism, allowing for simultaneous transmission of prioritized UL communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE is scheduled to transmit multiple uplink communications simultaneously to different TRPs, then the network resource usage efficiency is improved, but the UE may not be capable of simultaneous transmission due to TCI state constraints
Solution Approach 1:
The patent segments the uplink transmission resources by introducing a priority mechanism that divides simultaneous transmissions into ordered sequences. When multiple UL communications are scheduled with overlapping time resources, the UE prioritizes transmissions based on TCI state groups, allowing critical transmissions to proceed while deferring others, thus resolving the capability conflict.
Solution Approach 2:
The patent changes the parameter of transmission timing by adjusting the transmission time of prioritized UL communications. When a collision is detected, the UE modifies the transmission schedule by transmitting high-priority communications at their scheduled time while delaying or canceling lower-priority ones, effectively adapting the transmission parameters to match UE capabilities.
2Reliability
If the UE prioritizes and transmits only one UL communication when collisions occur, then the transmission reliability is improved, but the latency increases due to deferred transmissions
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority rules based on TCI state groups before collisions occur. The network configures the UE with priority information indicating which TCI state groups have higher priority, allowing the UE to make immediate prioritization decisions without delay when collisions are detected, thus minimizing latency while ensuring reliability.
3Device complexity
If the UE handles UL collisions by sequential transmission instead of simultaneous transmission, then the implementation complexity is reduced, but the network efficiency decreases
Solution Approach 1:
The patent introduces dynamics by making the transmission mode adaptive rather than fixed. The UE dynamically selects between simultaneous and sequential transmission based on real-time collision detection and priority evaluation. When no collision exists, simultaneous transmission maintains high efficiency; when collisions occur, the system dynamically switches to prioritized sequential transmission, balancing complexity and efficiency.
Data Source
AI summary
Systems, devices, and methods for handling uplink (UL) collisions in multi-transmission reception point (mTRP) communication scenarios are provided. A wireless communication method may be performed based on a mTRP UL prioritization configuration. For example, a method of wireless communication performed by a user equipment (UE) may include: receiving a first indication scheduling a first uplink (UL) communication associated with a first transmission configuration indicator (TCI) state and a first TRP; receiving a second indication scheduling a second UL communication associated with a second TCI state and a second TRP, wherein the second UL communication is scheduled to at least partially overlap in time with the first UL communication, and wherein the first UL communication and the second UL communication are scheduled for at least one of a same component carrier (CC) or a same frequency band; and transmitting, based on a mTRP UL prioritization configuration, the first UL communication.