Wireless RACH Time Offset Detection for Wide Cell Radius
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Solution Overview
Problem
Current 5G communication systems face challenges in supporting wide cell radii beyond the 100 km limit defined by the 3GPP standard, necessitating additional installation costs and complexity for extending communication services to areas like islands or seas.
Innovation Solution
A method for determining a correction time value by the reception end in a wireless communication system, allowing the transmission end to perform ranging access through a change in demodulation and scheduling procedures, enabling support for wider cell radii without altering the standard RACH preamble format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the cell radius is extended beyond 100 km to cover areas like islands or seas, then the coverage area is improved, but additional base station installations and system complexity are required
Solution Approach 1:
The patent changes the time offset parameter used for RACH signal detection to support wide cell radius operations. By adjusting the time offset value, the system can detect RACH signals from UEs located beyond the standard 100 km cell radius without requiring additional base station installations, thus extending coverage area while maintaining system simplicity
Solution Approach 2:
The patent dynamically adjusts the time offset parameter based on the detected RACH signal timing. The receiving end determines an appropriate time offset value to account for the extended propagation delay in wide cell scenarios, allowing the system to adapt to different cell radius conditions without structural modifications
2Area of stationary object
If the time offset for RACH signal detection is adjusted to support wide cell radius, then the cell radius coverage is improved, but the synchronization accuracy between uplink and downlink signals may deteriorate
Solution Approach 1:
The patent carefully adjusts the time offset parameter to balance coverage extension and synchronization accuracy. The time offset is set to compensate for the maximum expected propagation delay in wide cell scenarios while maintaining sufficient precision for accurate RACH signal detection and uplink synchronization
Solution Approach 2:
The patent employs feedback mechanisms where the receiving end monitors the detected time offset and adjusts it to optimize both coverage and synchronization accuracy. The system can refine the time offset value based on actual signal detection results to maintain precision even in extended cell radius conditions
Data Source
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AI summary
The present invention relates to a method for determining, by a receiving end, a correction time value according to ranging access in a wireless communication system, and an apparatus therefor. A reception apparatus in a wireless communication system according to an embodiment of the present invention may comprise: a signal period selector for selecting a first detection time interval and a second detection time interval from a RACH signal for ranging access, the RACH signal including a RACH preamble sequence; a time offset detector for detecting a first time offset and a second time offset, each corresponding to a point of time when the preamble sequence is received, from the selected first detection time interval and the second detection time interval, respectively; and a time offset determiner for determining a correction time value for correcting a point of time when data is transmitted by a transmitting end in the wireless communication system, on the basis of the detected first time offset and the second time offset. This research was carried out with the support of "Pan-government Giga Korea Project" led by the Ministry of Science, ICT and Future Planning.