mTRP Capability Signaling for Latency Reduction
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Solution Overview
Problem
The transition to multiple transceiver points (mTRPs) in user equipment can introduce latency as it is currently unclear whether the serving cell supports this transition, and confirming support requires additional signaling.
Innovation Solution
The proposed solution involves the user equipment (UE) receiving mTRP capability information from the network node before connecting, allowing the UE to determine if mTRP operation is supported and to set it up as part of the initial access procedure, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment confirms that the current serving cell supports transition to multiple TRPs using current procedures, then the reliability of mTRP operation is ensured, but latency is introduced due to additional signaling required
Solution Approach 1:
The network node broadcasts mTRP capability information in advance (before the UE needs to transition to mTRP operation). This preliminary disclosure of capability allows the UE to make informed decisions about cell selection and transition timing without requiring real-time confirmation signaling, thereby reducing latency while ensuring reliability.
2Loss of time
If the user equipment transitions to multiple TRPs without prior knowledge of network support, then latency is reduced by avoiding confirmation signaling, but the reliability of mTRP operation deteriorates due to uncertainty
Solution Approach 1:
The network node provides feedback to the UE in the form of broadcasted mTRP capability information. This feedback mechanism allows the UE to know whether the network supports mTRP operation before initiating transition, ensuring reliability without requiring additional confirmation signaling during the transition process.
3Loss of time
If the network node broadcasts mTRP capability information before connection, then latency is reduced by enabling informed UE decisions during initial access, but the device complexity increases due to additional information handling
Solution Approach 1:
The mTRP capability information is broadcast using existing network node resources and communication mechanisms already in place for cell selection and initial access. This universal approach allows the UE to process the information using its existing capabilities without requiring additional dedicated processing hardware or complex new protocols, thereby minimizing the increase in device complexity.
Data Source
AI summary
An apparatus comprising means for: signaling to a network node, during a random-access procedure and/or a connection setup procedure, that the user equipment has an interest in connecting to the network node using multiple transceiver points.An apparatus comprising means for: transmitting, before being connected to a user equipment, multi-transceiver point capability information for the network node; and receiving signaling, before connecting to a user equipment, during a random-access procedure and/or a connection setup procedure for the user equipment, indicating that the user equipment has an interest in connecting to the network node using multiple transceiver points.