TRP-Specific Reference Signals for Multiple-TRP Cell Mobility
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face limitations in handover efficiency and resource utilization due to the constraints of SSB indexing, which restrict the number of TRPs that can be identified by UEs, leading to reduced PRACH capacity and suboptimal resource allocation in multiple-TRP cells.
Innovation Solution
The method involves configuring wireless devices to generate measurement reports based on TRP-specific reference signals, allowing for enhanced mobility procedures and resource management by distinguishing between TRP-specific and multiple-TRP reference signals, thereby supporting Layer 2 mobility within multiple-TRP cells and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SSB indexing is used to identify TRPs, then UEs can detect and measure cell candidates, but the number of identifiable TRPs is restricted, reducing PRACH capacity
Solution Approach 1:
The patent segments the reference signal identification into two distinct types: SSB indexes for identifying multiple-TRP cells and TRP-specific reference signals for identifying individual TRPs within those cells. This segmentation allows UEs to distinguish between cell-level and TRP-level identification, enabling support for more TRPs than previously possible with SSB indexing alone, thereby increasing PRACH capacity while maintaining measurement precision.
2Productivity
If multiple-TRP cells are supported, then resource utilization can be improved, but handover efficiency decreases due to inability to distinguish individual TRPs
Solution Approach 1:
The patent introduces TRP-specific reference signals as an intermediary mechanism that bridges the gap between multiple-TRP cell support and individual TRP identification. These reference signals act as mediators that enable UEs to measure and report specific TRP conditions, allowing the network to make informed handover decisions while maintaining the resource utilization benefits of multiple-TRP cells.
3Reliability
If TRP-specific reference signals are configured, then mobility procedures are enhanced, but device complexity increases
Solution Approach 1:
The patent adds another dimension to the reference signal structure by introducing TRP-specific reference signals that complement the existing SSB indexing system. This dimensional expansion allows the system to maintain backward compatibility with existing SSB-based operations while adding new capability for TRP-specific measurement and reporting, thereby enhancing mobility support without fundamentally redesigning the entire system.
Data Source
AI summary
A method of operating a network node includes establishing a connection to a wireless device from a first transmission/reception point, TRP, that serves a multiple-TRP cell, and configuring the wireless device to generate measurement reports based on a TRP-specific reference signal transmitted by a second TRP that serves the multiple-TRP cell. A method of operating a wireless device includes establishing a connection to a first transmission/reception point, TRP, that serves a multiple-TRP cell, and generating a measurement report based on a TRP-specific reference signal transmitted by a second TRP that serves the multiple-TRP cell. Related devices and computer program products are disclosed.