UE Collision Handling for mTRP Scheduling Conflicts
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Solution Overview
Problem
In multi-transmission-reception point (mTRP) communication scenarios, user equipment (UE) often experiences scheduling collisions due to limited coordination between transmission reception points (TRPs), leading to conflicts in uplink and downlink communications that exceed the UE's capabilities, resulting in communication failures.
Innovation Solution
The UE receives multiple downlink control information (mDCI) messages from different TRPs, determines scheduling collisions based on its capabilities, and selectively drops conflicting communications, transmitting an indication to the TRPs to manage collisions, thereby reducing network overhead and allowing for flexible collision handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TRPs schedule communications independently without coordination, then scheduling flexibility and network resource utilization are improved, but scheduling collisions occur that exceed UE capabilities
Solution Approach 1:
The UE autonomously detects scheduling collisions by comparing received mDCI messages against its capability parameters (maxTotalRank, maxTransportBlocks) and independently determines which communications to drop, eliminating the need for TRP coordination while ensuring capability compliance
Solution Approach 2:
The UE transmits feedback information to TRPs indicating that a scheduled communication was dropped due to collision, enabling the TRP to adjust future scheduling decisions without requiring real-time coordination during the scheduling process
2Reliability
If TRPs coordinate scheduling to avoid collisions, then communication reliability is improved, but network overhead and signaling complexity increase
Solution Approach 1:
The UE performs self-contained collision detection and resolution using locally stored capability parameters, eliminating the need for complex inter-TRP coordination mechanisms while maintaining communication reliability
Solution Approach 2:
The UE pre-configures with maximum capability parameters (maxTotalRank, maxTransportBlocks) that define its operational limits, enabling proactive collision detection before actual communication failures occur without requiring real-time coordination
3Reliability
If UE drops communications due to scheduling collisions, then UE capability limitations are respected, but data loss and retransmission overhead increase
Solution Approach 1:
The UE provides feedback to TRPs about dropped communications, enabling the network to optimize scheduling and reduce unnecessary retransmissions by understanding which communications were legitimately dropped due to capability constraints
Solution Approach 2:
The system dynamically adjusts operational parameters based on collision detection, with the UE modifying its effective capability parameters (e.g., actual total rank, actual number of transport blocks) when collisions are detected to ensure compliance with hardware limitations
Data Source
AI summary
Systems, devices, and methods for handling scheduling collisions or conflicts in multi-transmission reception point (mTRP) communication scenarios are provided. A UE may receive indications for communicating two or more communications that would exceed or violate a UE capability or limitation. For example, a method of wireless communication performed by a UE comprises: receiving, from a first network node, a first mDCI indicating a first reserved resource; receiving, from a second network node, a second mDCI indicating a second reserved resource; refraining, based on the first reserved resource, the second reserved resource, and a capability of the UE, from communicating a first communication in the first reserved resource; communicating a second communication in the second reserved resource; and transmitting, based on the refraining, an indication that the UE did not communicate the first communication.