UE Timing Offset Reporting for Multi-TRP Timing Advance
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Solution Overview
Problem
Current NR specifications do not support multiple timing advance values per serving cell, leading to increased UL resource utilization, latency, and interference in multi-TRP scenarios, particularly for DL CSI acquisition in TDD C-JT with M-TRP operation.
Innovation Solution
A UE-initiated timing offset reporting procedure is implemented, allowing the UE to determine and report timing offset values for different TRPs, enabling refined UL timing advance adjustments without PDCCH orders, thereby optimizing UL resource usage and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple timing advance values are implemented per serving cell, then UL resource efficiency is improved and latency is reduced, but device complexity increases
Solution Approach 1:
The patent segments the timing advance management by introducing separate timing advance groups (TAGs) for different TRPs. Each TAG maintains its own timing advance value, allowing independent optimization for each TRP while managing complexity through structured organization of these groups.
Solution Approach 2:
The patent implements dynamic timing advance adjustment where the UE can autonomously determine and report timing offset values based on actual downlink reception conditions. This dynamic approach allows the system to adapt timing advance values in real-time without requiring complex manual configuration.
2Loss of time
If multiple timing advance values are implemented per serving cell, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent segments timing advance management into separate TAGs for different TRPs, enabling parallel processing of timing adjustments for multiple TRPs simultaneously. This segmentation reduces overall latency by allowing concurrent timing advance updates without sequential dependencies.
Solution Approach 2:
The UE autonomously determines timing offset values based on downlink reception and generates reports without requiring explicit network commands. This self-service mechanism reduces the time needed for timing advance adjustment by eliminating the need for continuous network-UE coordination.
3Device complexity
If traditional timing advance procedure is used, then device complexity is low, but UL resource utilization increases and interference increases
Solution Approach 1:
The patent applies local quality by assigning different timing advance values to different TRPs based on their specific propagation conditions. Each TRP receives customized timing adjustment tailored to its local characteristics, preventing interference from mismatched timing while avoiding the need for complex centralized timing management.
Data Source
AI summary
An apparatus may be configured to: receive a plurality of downlink resources, wherein the plurality of downlink resources are respectively associated with respective ones of a plurality of transmission and reception points of a network; determine a set of respective timing offset values, wherein respective ones of the determined set of respective timing offset values are associated with different respective ones of the plurality of downlink resources; generate a report based, at least partially, on the determined set of respective timing offset values; transmit the report to the network; and receive one or more timing advance values in response to the transmitted report.