LTE CoMP UE Positioning Using Virtual RRH Identifiers
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Solution Overview
Problem
Coordinated multipoint (CoMP) systems in LTE-A networks face challenges in accurate user equipment (UE) positioning due to ambiguity in current measurement operations based on cell IDs, leading to distorted positioning measurements like OTDOA and ECID.
Innovation Solution
The use of virtual identifiers associated with remote radio heads (RRHs) to enhance positioning accuracy by encoding and decoding positioning reference signals (PRS), allowing UEs to uniquely identify and measure signals from different RRHs within a CoMP system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cell IDs are used for positioning measurements in CoMP systems, then the positioning process is simple, but positioning accuracy deteriorates due to signal ambiguity from multiple RRHs sharing the same cell ID
Solution Approach 1:
The patent segments the cell ID space by introducing virtual RRH IDs that are specific to each remote radio head. Instead of using a single cell ID for multiple RRHs, each RRH is assigned a unique virtual identifier, allowing the UE to distinguish and separately measure signals from different RRHs. This segmentation resolves the signal ambiguity problem while maintaining the structured approach of ID-based identification.
Solution Approach 2:
The patent introduces virtual RRH IDs as an intermediary layer between the physical RRHs and the positioning measurement process. These virtual identifiers act as mediators that map multiple RRHs to distinguishable measurement targets, enabling the UE to perform accurate measurements without directly dealing with the complexity of multiple cell IDs. The virtual IDs serve as a bridge that preserves measurement simplicity while achieving precision.
2Measurement precision
If virtual identifiers are introduced for each RRH, then positioning accuracy improves through unique signal identification, but system complexity increases due to additional identifier management
Solution Approach 1:
The patent makes the virtual RRH ID system universal by having the eNB manage and distribute virtual identifiers to multiple RRHs under its control. The same mechanism can be applied across different CoMP scenarios and multiple eNBs, providing a scalable solution. The virtual ID system serves multiple functions: identifying RRHs for positioning, managing signal associations, and enabling flexible resource allocation without requiring separate systems for each function.
Solution Approach 2:
The patent implements self-service by having the eNB automatically manage the allocation and mapping of virtual RRH IDs to physical RRHs without requiring manual configuration. The system autonomously handles the complexity of identifier management, allowing the network to adapt dynamically to changing RRH configurations while maintaining positioning accuracy. This self-managing approach reduces operational burden despite the increased system complexity.
3Object-affected harmful factors
If multiple virtual RRH IDs are used for positioning measurements, then signal interference is reduced through unique identification, but measurement processing complexity increases
Solution Approach 1:
The patent applies local quality by associating specific virtual RRH IDs with specific spatial locations and signal characteristics of each RRH. Each virtual identifier carries local information about its corresponding RRH's position and signal properties, allowing the UE to perform targeted measurements with reduced interference. This localized association enables the system to handle multiple identifiers efficiently by processing them according to their specific spatial and signal characteristics rather than treating them uniformly.
Data Source
AI summary
Embodiments of the present disclosure describe systems and methods for UE positioning in wireless networks. Various embodiments may include signaling of virtual identifiers associated with remote radio heads of a coordinated multipoint communication system and generating a positioning reference signal based on the virtual identifiers. Other embodiments may be described and/or claimed.