Dynamic Cell ID Scrambling for Unlicensed Band Coexistence
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Solution Overview
Problem
In wireless communication systems, operators using the same cell ID on unlicensed bands face interference and coexistence issues, as existing technologies do not effectively manage cell ID collisions and operator identification on unlicensed bands.
Innovation Solution
A method where user equipment receives a reference signal generated from a scrambling sequence with an initial value changed every 10 subframes, using a seed value determined by the operator, to prevent cell ID collisions by dynamically changing the cell ID and synchronization signal on unlicensed bands, including physical and higher layer signaling for operator identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If operators use the same cell ID on unlicensed band, then resource utilization is improved, but interference and coexistence issues occur
Solution Approach 1:
The patent applies dynamics by making the cell ID configurable and changeable over time. The base station can dynamically adjust the cell ID based on detection results and operator identification, allowing the system to adapt to changing conditions on unlicensed bands while maintaining resource utilization efficiency.
Solution Approach 2:
The patent changes the cell ID parameter to resolve interference issues. By modifying the cell ID that user equipment uses to identify and connect to base stations, the system enables multiple operators to coexist on the same unlicensed band without constant interference, while still allowing efficient resource utilization when operators are differentiated.
2Measurement precision
If cell ID is changed dynamically every 10 subframes, then operator identification accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent implements periodic action by changing the cell ID every 10 subframes. This periodic update allows user equipment to accurately identify operators through repeated measurements and comparisons, while the fixed period provides predictability that simplifies the processing complexity compared to arbitrary changes.
Solution Approach 2:
The patent applies preliminary action by having user equipment store reference cell ID information in advance. Before actual operator identification, the equipment pre-stores the cell ID values it should expect from its serving operator, enabling efficient comparison and identification when cell ID changes occur periodically without requiring complex real-time analysis.
3Reliability
If synchronization signal is changed every 10 subframes, then cell ID collision prevention is improved, but synchronization complexity increases
Solution Approach 1:
The patent applies dynamics by making the synchronization signal changeable over time, specifically every 10 subframes. This dynamic approach ensures that cell ID collisions are prevented through periodic variation, while the regular interval provides a predictable pattern that simplifies the synchronization process compared to irregular changes.
Solution Approach 2:
The patent implements preliminary action by configuring user equipment with knowledge of the cell ID change pattern in advance. The equipment is pre-informed about the periodic nature of synchronization signal changes and the expected cell ID values, enabling it to maintain synchronization without requiring complex detection algorithms for each individual change.
Data Source
AI summary
A method for signal transmission and reception on an unlicensed band by a terminal in a wireless communication system, according to an embodiment of the present invention, comprises the steps of: receiving a reference signal that has been generated from a scrambling sequence having initial values that vary every 10 subframes; and receiving a downlink signal on the basis of the reference signal, wherein the seed value of the variation pattern of the initial values are determined on the basis of an operator of a base station that transmits the downlink signal on the unlicensed band.