Moving Cell Synchronization Signal Frequency Mapping
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Solution Overview
Problem
In high-density wireless environments, moving cells in 5G communication systems face challenges with unnecessary handovers and channel quality measurements due to congestion, leading to delays and inefficient resource allocation.
Innovation Solution
A method for transmitting a synchronization signal by a moving cell base station, where the synchronization signal sequence is mapped to a different frequency region than that used by legacy user equipment, utilizing a Zadoff-Chu sequence with a dedicated root index to prevent interference and facilitate efficient handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moving cells use the same frequency region as legacy user equipment for synchronization signals, then legacy user equipment can detect and measure the signals, but interference occurs leading to unnecessary handovers and measurement delays
Solution Approach 1:
The frequency region for synchronization signals is segmented into different parts: legacy user equipment uses the original frequency region while moving cells use a different frequency region. This segmentation prevents interference between the two types of user equipment, allowing moving cells to perform handovers without unnecessary delays caused by detecting legacy cell synchronization signals.
Solution Approach 2:
The synchronization signal transmission for moving cells is extracted from the common frequency region and placed in a dedicated frequency region. This extraction eliminates the interference problem that would otherwise cause legacy user equipment to incorrectly detect moving cells as target cells for handover, thereby preventing unnecessary handover delays.
2Productivity
If moving cells transmit synchronization signals on the same frequency region, then signal detection is possible, but interference increases causing unnecessary measurements and handovers
Solution Approach 1:
The solution moves the synchronization signal transmission from the same frequency dimension to a different frequency dimension. By allocating a dedicated frequency region for moving cells, the system adds frequency dimension separation, which eliminates interference while maintaining signal detectability, thus improving communication efficiency without generating harmful interference.
3Reliability
If a dedicated frequency region is allocated for moving cells, then interference with legacy user equipment is minimized, but frequency resource allocation becomes more complex
Solution Approach 1:
The frequency region for moving cells is predetermined and pre-configured in the system. This preliminary allocation of frequency resources eliminates the need for complex real-time frequency allocation decisions, reducing system complexity while ensuring reliable communication by preventing interference from the outset.
Data Source
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AI summary
Disclosed is a method of transmitting a synchronization signal from a moving cell base station in a wireless communication system. The present invention includes mapping a moving cell synchronization signal sequence generated on a basis of a sequence assigned for a moving cell to a frequency region and transmitting the mapped moving cell synchronization signal sequence. Moreover, the moving cell synchronization signal sequence may be mapped to the frequency region different from a prescribed frequency region for transmitting a synchronization signal for a user equipment unsupportive of the moving cell.