Multi-TRP Timing Advance Management with Dual TAG Updates
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple timing advance values for multi-transmission and reception point operations, particularly in supporting two Timing Advance Groups (TAGs) for serving cells associated with two TRPs, and in updating these values using a single MAC-CE command.
Innovation Solution
The system enhances RRC signaling to configure two TAGs for a serving cell, either explicitly or implicitly, and introduces a new Timing Advance Command MAC-CE to update multiple TA values efficiently, along with UE-assist information for timing advance acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple timing advance values are managed for multi-TRP operations, then mobility robustness is improved, but device complexity increases
Solution Approach 1:
The system segments timing advance management by introducing Timing Advance Groups (TAGs) where each TAG is associated with a specific TRP. This allows independent management of multiple TAs without requiring the UE to handle all TAs uniformly, reducing management complexity while maintaining multiple TA values for improved mobility robustness
Solution Approach 2:
The network configures multiple TAGs and their associated TAs in advance through RRC signaling before multi-TRP operations begin. This preliminary configuration eliminates the need for dynamic TA negotiation during mobility events, simplifying real-time management while ensuring robustness is pre-established
2Adaptability or versatility
If multiple TAGs are configured for serving cells, then support for multi-TRP operations is improved, but signaling overhead increases
Solution Approach 1:
Multiple TAG configurations are merged into a single RRC Reconfiguration message through the TAG-Config information element. This consolidates what would otherwise be separate signaling transactions into one unified message, reducing signaling overhead while maintaining full multi-TRP configuration capability
Solution Approach 2:
The TAG-Config structure serves multiple functions simultaneously: it defines TAG identities, associates serving cells with TAGs, and configures timing advance parameters. This multi-functionality eliminates the need for separate dedicated signaling for each aspect of TAG configuration, reducing overall signaling overhead
3Productivity
If a single MAC-CE command updates multiple TA values, then productivity is improved, but measurement precision decreases
Solution Approach 1:
The single MAC-CE command is segmented into multiple independent TA Command fields, each associated with a specific TAG identifier. This segmentation allows the UE to extract and apply each TA value independently to its corresponding TAG, maintaining measurement precision while achieving efficient bulk updates through a single command
Data Source
AI summary
Embodiments herein describe systems, methods, and apparatuses to configure a downlink time difference (DL TD) measurement. For a DL TD measurement, a network node may configure reference signals from a first transmission and reception point (TRP) and a second TRP to be used for measuring a DL ID between the first TRP and the second TRP. The UE may measure and report the DL TD using the reference signals to determine a relative receiving timing difference at the UE between the first TRP and the second TRP.