Hierarchical PCI Addressing With Tertiary Synchronization Signals
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Solution Overview
Problem
In wireless communication systems, the uncertainty in physical cell identifier (PCI) values among neighboring cells leads to challenges during receiving, transmitting, and handover procedures, and increasing the range of PCI values without proportionally increasing computational operations is desired.
Innovation Solution
The introduction of a tertiary synchronization signal, in addition to primary and secondary synchronization signals, allows UEs to determine a PCI value based on a first, second, and third code, reducing the likelihood of PCI value duplication among neighboring cells, thereby enhancing the range of possible PCI values while maintaining manageable computational operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the range of PCI values is increased to reduce duplication among neighboring cells, then the reliability of cell identification is improved, but the device complexity and computational operations increase proportionally
Solution Approach 1:
The PCI identification process is segmented into three hierarchical levels: first code from primary synchronization signal, second code from secondary synchronization signal, and third code from tertiary synchronization signal. This segmentation allows the system to expand the total PCI space without requiring a single complex identification mechanism, thereby maintaining manageable computational operations while improving reliability.
Solution Approach 2:
The patent introduces a third dimension of identification by adding the tertiary synchronization signal with a third code. This transforms the PCI identification from a two-dimensional space (first and second codes) to a three-dimensional space, exponentially expanding the available PCI values without proportionally increasing the complexity of each individual code determination.
2Adaptability or versatility
If additional synchronization signals are introduced to expand PCI values, then the range of possible PCI values increases, but the difficulty of detecting and measuring signals increases
Solution Approach 1:
The first code and second code are determined first as preliminary steps before attempting to detect the third code. This preliminary action establishes a foundation for the subsequent detection of the tertiary synchronization signal, allowing the UE to methodically progress through the identification hierarchy and reducing the overall difficulty of signal detection.
Solution Approach 2:
The patent implements a dynamic detection process where the UE adaptively determines whether to detect the third code based on the values of the first and second codes. This dynamic approach allows the system to expand PCI range while maintaining manageable detection complexity by conditionally performing additional measurements only when necessary.
3Reliability
If hierarchical code structure is implemented to reduce PCI duplication, then the uncertainty in handover procedures is reduced, but the time required for cell identification increases
Solution Approach 1:
The hierarchical code structure enables a periodic or staged identification process where the UE first determines the first code, then the second code, and conditionally proceeds to the third code. This periodic action allows the system to achieve reliable handover procedures through systematic verification at each stage while minimizing total identification time by not always requiring all three codes.
Solution Approach 2:
The patent applies partial action by allowing the UE to complete cell identification using only the first and second codes in certain scenarios, without always requiring the third code. This partial approach reduces the average cell identification time while still providing sufficient reliability for handover procedures in many cases, thereby reducing the time loss.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a first set of one or more signals and a second set of one or more signals, the first set of one or more signals indicating a first code value associated with a physical cell identifier (PCI), and the second set of one or more signals indicating a second code value associated with the PCI. The UE may receive, based at least in part on the first code value and the second code value, a third set of one or more signals indicating a third code value associated with the PCI. The UE may communicate one or more wireless communications with a first cell according to a physical cell identity of the first cell, where the physical cell identity is encoded by the first code value, the second code value, and the third code value.