LTE Random Access Detection with Extended Cyclic Prefix
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Solution Overview
Problem
The existing LTE protocol limits the maximum cell coverage radius to 103 Km, requiring a large number of base stations for network construction, thereby increasing maintenance and construction costs, especially in areas like deserts and sea surfaces.
Innovation Solution
Extending the cyclic prefix range in the LTE protocol to introduce an enhanced format for the random access procedure, allowing for the extraction and processing of time-domain antenna data in both original and enhanced formats to support super long range coverage up to 206 Km without additional functionality at the mobile station side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the original LTE protocol format is used for random access procedure, then the system is simple and compatible, but the cell coverage radius is limited to 103 Km
Solution Approach 1:
The patent segments the random access procedure into two distinct formats: original format for normal coverage and enhanced format for extended coverage. The enhanced format introduces a new cyclic prefix structure with longer duration specifically designed for cells exceeding 103 Km radius, allowing the system to handle different coverage scenarios with specialized formats rather than a one-size-fits-all approach
Solution Approach 2:
The patent changes key parameters of the random access format, specifically extending the cyclic prefix length from the original range to support larger cell radii. The enhanced format modifies the time-domain structure with a cyclic prefix duration of 1666.67 microseconds compared to the original shorter prefix, enabling signals to traverse the extended 206 Km coverage area without degradation
2Area of stationary object
If more base stations are deployed to cover larger areas, then the coverage range increases, but the network construction and maintenance costs increase
Solution Approach 1:
The patent creates a universal enhanced random access format that enables existing base station infrastructure to serve both normal and extended coverage areas. The same base station can handle both original format requests from mobile stations in normal coverage and enhanced format requests from mobile stations in extended coverage, making the infrastructure multi-functional without requiring additional base stations
3Length of stationary object
If the cyclic prefix range is extended to support super long range coverage, then the cell coverage radius increases to 206 Km, but the signal processing complexity increases
Solution Approach 1:
The patent implements dynamic format selection where the base station determines whether to use original or enhanced format based on the detected mobile station location and coverage requirements. The system dynamically switches between the two formats, using the enhanced cyclic prefix structure only when needed for extended coverage scenarios, thereby optimizing resource utilization and managing processing complexity
Data Source
AI summary
A method and a device for detection in cell random access are provided. The method includes: extending an original format used for a random access procedure to change a CP range defined by the original format; in the process of extracting a time-domain signal of a random access channel, extracting and splitting input data into time-domain antenna data in the original format and time-domain antenna data in an enhanced format, and performing signal extraction processing on the time-domain antenna data in the original format and the time-domain antenna data in the enhanced format respectively; and in the process of detection, detecting the time-domain antenna data in the original format and the time-domain antenna data in the enhanced format after the signal extraction processing to obtain detection information. The method can improve the performance of a BS and reduce the network construction costs without affecting an MS.