Multi-TRP Timing Advance Segmentation via PDCCH Orders
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving accurate timing alignment across multiple transmission/reception points (TRPs) in a multi-TRP deployment, which affects the reliability and efficiency of data transmission.
Innovation Solution
The implementation of a method that allows for multiple timing advance (TA) operations in a wireless communication system, where a wireless transmit/receive unit (WTRU) can receive PDCCH orders to trigger Physical Random Access Channel (PRACH) transmissions, determine uplink TA values, and maintain timing alignments with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single timing advance loop is used in multi-TRP deployment, then the system complexity is reduced, but the timing alignment accuracy across multiple TRPs deteriorates
Solution Approach 1:
The patent divides the single timing advance loop into multiple independent timing advance loops, with each loop dedicated to a specific TRP. This segmentation allows each TRP to have its own timing advance value (TA1, TA2, etc.), enabling independent timing adjustment for each TRP-WTRU link, thereby resolving the timing alignment accuracy issue while managing complexity through structured organization
Solution Approach 2:
The patent introduces a new dimension of timing management by adding TRP-specific timing advance dimensions. Instead of a single scalar timing advance value, the system now operates with multiple timing advance values across different TRPs, effectively adding a TRP dimension to the timing advance parameter space, which enables precise timing alignment across geographically distributed TRPs
2Measurement precision
If multiple timing advance operations are implemented, then the timing alignment accuracy across multiple TRPs is improved, but the device complexity increases
Solution Approach 1:
The patent segments the timing advance management into multiple independent loops, each handling a specific TRP. This segmentation isolates the complexity into manageable units, where each timing advance loop operates independently with its own TA value, making the overall complex system comprehensible and controllable through modular organization
Solution Approach 2:
The patent implements feedback mechanisms where each timing advance loop continuously monitors and adjusts its timing advance value based on timing alignment measurements. The WTRU measures timing differences for each TRP and provides feedback to adjust TA1, TA2, etc., independently, enabling automatic adaptation that manages complexity through self-regulation
3Adaptability or versatility
If PDCCH order triggers PRACH transmission to a specific TRP, then the adaptability of the system is improved, but the control signal complexity increases
Solution Approach 1:
The patent applies local quality by configuring different PRACH resources, preamble indices, and timing advance values for different TRPs. Each TRP has its own localized configuration parameters, allowing the system to adapt to specific TRP characteristics (such as propagation delay, beam direction) without requiring uniform configuration across all TRPs, thereby managing complexity through localized optimization
Solution Approach 2:
The patent performs preliminary configuration of PRACH resources, preamble indices, and timing advance values for multiple TRPs before actual PRACH transmission. The network pre-configures TRP-specific parameters and the WTRU stores these configurations, ready for rapid activation via PDCCH order, avoiding the need for complex real-time negotiation and reducing control signal complexity during actual transmission
Data Source
AI summary
A WTRU may receive downlink control information (DCI) from a first transmission/reception (TRP). The DCI may indicate that the WTRU is to transmit a physical random access channel (PRACH) transmission. The DCI may include an indication of a preamble, an indication of a first PRACH mask, and/or an indication associated with a first synchronization signal block (SSB), and/or an indication of a reference signal (RS). The WTRU may be configured to transmit the preamble, to a second TRP, the preamble in a first PRACH resource. The first TRP and/or the second TRP may be associated with a same physical cell identity (PCI). The WTRU may receive, from the second TRP, a first response to the preamble. The first response may include a first timing advance (TA) command for the second timing alignment for transmission to the second TRP and/or an index indicating the second TRP.