Simultaneous Neighbor Base Station Scanning in WiMAX
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Solution Overview
Problem
In time synchronous wireless communication systems like WiMAX, mobile stations face throughput loss when scanning for neighbor base station preamble indices, as they need to suspend data transmission and request a special scanning duration, which disrupts regular communication.
Innovation Solution
A mobile station can detect serving and neighbor base station preamble indices within the same frame by processing multiple subcarrier subsets, allowing for simultaneous signal quality measurement without requesting a special scanning duration, thus maintaining data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mobile station requests special scanning duration to scan for neighbor base station preamble indices, then scanning accuracy is improved, but data throughput deteriorates due to suspension of data transmission
Solution Approach 1:
The patent segments the frequency spectrum into multiple subcarrier subsets and assigns different base stations to transmit preamble indices on different subsets. This allows the mobile station to scan multiple neighbor base stations simultaneously on different frequency subsets without suspending data transmission, thereby maintaining data throughput while achieving comprehensive scanning coverage.
Solution Approach 2:
The patent introduces a frequency domain dimension by utilizing multiple subcarrier subsets for preamble index transmission. Instead of scanning in the time domain (which requires suspending data transmission), the system enables parallel scanning across multiple frequency subsets, transforming the scanning process from a time-sequential operation to a frequency-parallel operation.
2Productivity
If mobile station scans for neighbor base stations during the same frame, then system capacity is improved, but signal quality measurement accuracy deteriorates due to simultaneous transmission interference
Solution Approach 1:
The patent divides the frequency spectrum into multiple non-overlapping subcarrier subsets and assigns different base stations to different subsets for preamble index transmission. This segmentation eliminates interference between simultaneous transmissions, allowing accurate signal quality measurement of multiple base stations without requiring sequential scanning.
Solution Approach 2:
The patent ensures that each subcarrier subset is dedicated to specific base stations, creating localized frequency resources with unique transmission characteristics. This local quality assignment prevents interference between neighboring base stations and enables simultaneous measurement of signal quality from multiple base stations with high accuracy.
Data Source
AI summary
A method for scanning for neighbor base stations in a time synchronous wireless communication system may be implemented by a mobile station. The method may include detecting a serving base station preamble index that is transmitted by a serving base station in a subcarrier subset during a frame. The method may also include using the detected serving base station preamble index to determine a signal quality measurement for the serving base station. The method may also include detecting at least one neighbor base station preamble index that is transmitted by a neighbor base station in another subcarrier subset transmitted during the same frame. The method may further include using the detected neighbor base station preamble index to determine a signal quality measurement for the neighbor base station.