Multi-TRP Path Loss Difference for False Preamble Detection
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Solution Overview
Problem
In multi-TRP cells of 5G wireless communication networks, the sharing of the same PRACH sequence resource leads to PRACH ambiguity, resulting in reduced PRACH capacity and performance, particularly due to false preamble detections by TRPs far from the intended UE, which can cause radio resource and processing resource waste and degrade Key Performance Indicators (KPIs).
Innovation Solution
A method where the network node calculates the smallest distance between each TRP and other TRPs in a multi-TRP cell, establishes path loss differences, and sets a target power based on this calculation and preamble detection sensitivity levels to ensure that only the intended TRP receives the preamble, thereby reducing false detections and improving network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same PRACH sequence resource is shared among multiple TRPs in a multi-TRP cell, then the PRACH capacity is reduced and false preamble detections occur, but the network complexity is simplified
Solution Approach 1:
The patent changes the power control parameters by introducing TRP-specific path loss differences and minimum distance calculations. The network node calculates the minimum distance between the UE and each TRP, then determines a path loss difference based on these distances. This parameter adjustment allows the UE to set different target powers for different TRPs, ensuring that preambles are detectable only by the intended TRP and not by other TRPs that would cause false detections.
2Reliability
If target power is increased to ensure preamble detection by the intended TRP, then detection reliability improves, but false detections by distant TRPs increase
Solution Approach 1:
The patent applies local quality by making the target power setting TRP-specific rather than uniform across all TRPs. Each TRP has its own path loss difference calculation based on its distance from the UE. The UE configures different target powers for different TRPs, so that the power level is locally optimized for each TRP-UE pair. This ensures reliable detection at the intended TRP while preventing false detections at distant TRPs.
Solution Approach 2:
The patent performs preliminary action by calculating the minimum distance and path loss difference before the actual preamble transmission. The network node determines the appropriate target power in advance based on the UE's location relative to each TRP. This preliminary power configuration allows the UE to transmit with the exact power needed for reliable detection without causing interference to other TRPs.
3Reliability
If path loss difference is established based on minimum distance between TRPs, then false detections are minimized, but calculation complexity increases
Solution Approach 1:
The patent applies self-service by having the network node autonomously calculate the minimum distances and path loss differences without requiring additional signaling or external assistance. The network node uses its own knowledge of TRP locations and UE position to perform these calculations internally. This self-service approach minimizes false detections while avoiding the need for complex inter-node communication protocols.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the performance of Random Access procedures in multi-TRP cells by minimizing false preamble detections, maintaining PRACH capacity, and simplifying cell optimization and planning, thus improving overall network KPIs.
Implementation Method 1
based on the minimum distance, establish a path loss difference towards each of the TRPs in the set of TRPs, as experienced by the UE
Data Source
AI summary
A method performed by a network node for controlling power in a Random Access (RA) procedure is provided. The RA procedure is from a UE to a first Transmission and reception Point (TRP) in a multi TRP cell in a wireless communications network. For each respective TRP out of a set of TRPs, network node calculates a smallest distance between this TRP and each respective other TRP comprised in the set of TRPs. The set of TRPs are comprised in the multi TRP cell. The network node obtains a minimum distance among the calculated smallest distances. Based on the minimum distance, the network node establishes a path loss difference towards each of the TRPs in the set of TRPs, as experienced by the UE. The network node calculates a target power based on the established path loss difference and a preamble detection sensitivity level. The target power is to be used.