LBS-RS Detection Using Frequency Offset and Idle Subframes
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Solution Overview
Problem
Conventional wireless communication systems face challenges in accurately detecting Location Based Service-Reference Signals (LBS-RS) due to path loss and propagation delays, which can lead to signal interference and detection errors in mobile stations.
Innovation Solution
The method involves receiving LBS-RS setup information from a serving cell, acquiring frequency offset values, and detecting LBS-RS signals using this information to measure reception delay times, while also establishing idle subframes to prevent interference and ensure accurate signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LBS-RS signals are transmitted from multiple cells for location measurement, then location based service capability is improved, but signal interference and detection errors increase due to path loss and propagation delays
Solution Approach 1:
The patent applies preliminary action by pre-configuring LBS-RS setup information including frequency offset values, bandwidth parameters, and cyclic prefix lengths before signal transmission. The mobile station receives and stores this configuration data in advance, enabling it to properly detect and measure LBS-RS signals from multiple cells despite path loss and propagation delays, thus resolving the contradiction between enhanced location service capability and maintained signal detection accuracy
2Measurement precision
If three or more signals are transmitted for OTDOA location measurement, then location measurement capability is improved, but system complexity and signal interference increase
Solution Approach 1:
The patent applies parameter changes by systematically varying key signal parameters including frequency offsets, bandwidth allocations, and cyclic prefix lengths for LBS-RS signals transmitted from different cells. These parameter variations enable the mobile station to distinguish between multiple simultaneous signals, allowing accurate location measurement using three or more signals without proportionally increasing system complexity
3Reliability
If LBS-RS signals are transmitted with higher power to overcome path loss, then signal detection reliability is improved, but energy consumption and interference to other signals increase
Solution Approach 1:
The patent applies parameter changes by optimizing the power allocation for LBS-RS signals based on configured parameters such as bandwidth and signal purpose. Rather than uniformly increasing power across all LBS-RS transmissions, the system adjusts power levels according to specific measurement requirements and channel conditions, maintaining adequate signal detection reliability while minimizing unnecessary energy consumption and reducing interference to other signals
Data Source
AI summary
A method for allowing a mobile station to detect a Location Based Service-Reference Signal (LBS-RS) in a wireless communication system is disclosed. The method includes receiving LBS-RS setup information of at least one target cell participating in location measurement from a serving cell, acquiring a frequency offset value of the target cell using the LBS-RS setup information, and detecting the LBS-RS transmitted from the target cell using the LBS-RS setup information and the frequency offset value. In addition, the method further includes measuring a reception delay time of the detected LBS-RS, and transmitting a reception delay time to the serving cell.