Frequency Overlay Cell Acquisition via Reference Signal Correlation
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Solution Overview
Problem
Current broadband communication systems face challenges in providing efficient broadband services due to limited frequency bands and high license costs, particularly when overlaying existing communication systems, as there is a lack of methods for generating preamble sequences that distinguish between different communication systems and ensure backward compatibility.
Innovation Solution
A system and method for generating a reference signal using a specific sequence in a frequency overlay communication system, where a base station transmits a reference signal for cell identification, and a mobile station determines the corresponding base station identifier through correlation calculation, enabling cell acquisition in both narrow and extended frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a broadband communication system uses a different frequency band from existing communication systems, then frequency resource efficiency is improved, but license costs increase and backward compatibility becomes difficult to achieve
Solution Approach 1:
The patent merges broadband communication systems and existing narrowband communication systems into the same frequency band by designing a unified preamble structure. The preamble includes both a narrowband part (first sequence) and a broadband part (second sequence), allowing both system types to coexist and be identified in the overlay frequency band without requiring separate frequency allocations.
Solution Approach 2:
The preamble sequence is designed to serve multiple functions simultaneously: it enables cell acquisition for both narrowband and broadband systems, provides system type identification through correlation detection, and maintains backward compatibility while supporting new broadband services. This multi-functional design eliminates the need for separate preamble structures for different system types.
2Quantity of substance
If existing communication systems and broadband communication systems overlay in the same frequency band, then license costs are reduced, but cell acquisition becomes difficult due to inability to distinguish between different communication systems
Solution Approach 1:
The preamble sequence is segmented into two distinct parts: a first sequence designed for narrowband system compatibility and a second sequence for broadband system identification. This segmentation allows mobile stations to perform correlation detection on both sequences, thereby identifying whether a detected cell belongs to an existing narrowband system or a new broadband system operating in the overlay band.
Solution Approach 2:
The patent uses sequence correlation properties as a form of 'signal color' to distinguish between system types. By designing the first and second sequences with different correlation characteristics, mobile stations can detect and identify the system type based on which sequence shows maximum correlation, analogous to detecting different colors or signatures in the signal.
3Adaptability or versatility
If a unified preamble sequence is used for both existing and broadband communication systems, then backward compatibility is improved, but the ability to distinguish between different communication systems deteriorates
Solution Approach 1:
The unified preamble is segmented into a first sequence portion for backward compatibility with narrowband systems and a second sequence portion for broadband system identification. Mobile stations perform correlation detection on both portions, allowing them to maintain compatibility with existing systems while simultaneously acquiring information about broadband systems in the overlay band.
Solution Approach 2:
The first and second sequences are designed with asymmetric correlation properties - the first sequence has high correlation with narrowband system preambles for backward compatibility, while the second sequence has distinct correlation characteristics that enable broadband system identification. This asymmetric design preserves compatibility information while adding new system identification capability.
Data Source
AI summary
A system for performing cell acquisition in a frequency overlay communication system having a first frequency band and a second frequency band including the first frequency band. A base station (BS) generates a reference signal used for identifying a cell using a specific sequence in a predetermined frequency band, and transmits the reference signal. A mobile station (MS) receives the reference signal to determine whether the BS uses the first frequency band or the second frequency band, determines a reference signal having a maximum correlation value through correlation calculation with at least one predefined sequence, and detects a BS identifier (ID) corresponding to the determined reference signal.