Multicarrier Interference Measurement for Mobile Station Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile communication systems in multicell environments face challenges in determining the position of a mobile station within a sector, especially when using non-beamforming antenna configurations, as existing interference measurement methods do not provide location information, leading to inefficient resource allocation and increased interference.
Innovation Solution
The solution involves measuring interference power on specific subcarriers from neighboring sectors, using orthogonal preamble sub-carriers to determine the carrier-to-interference-plus-noise ratio, allowing for location determination and improved resource allocation to minimize interference, which can be transmitted to the base station for further interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency reuse schemes are employed to achieve maximum throughput in multicell environment, then system throughput is improved, but interference level increases
Solution Approach 1:
The patent segments the frequency spectrum into different carrier frequencies and assigns them to different sectors in a systematic reuse pattern. By dividing the available spectrum and allocating specific carriers to specific sectors (e.g., Sector 1 uses Carriers A and B, Sector 2 uses Carriers B and C), the system achieves frequency reuse while controlling interference through structured resource partitioning
Solution Approach 2:
The patent applies local quality by assigning different carrier frequency combinations to different sectors based on their specific locations and interference environments. Each sector has a customized carrier assignment (e.g., Sector 1: A+B, Sector 2: B+C, Sector 3: C+A) that optimizes performance for that local area while contributing to overall system throughput
2Measurement precision
If beamforming with perfectly calibrated antenna array is used to derive position information, then position determination is enabled, but device complexity and calibration requirements increase
Solution Approach 1:
The patent introduces carrier interference measurements as an intermediary method to derive position information. Instead of directly using complex beamforming techniques, the system uses the measured interference levels on different carriers as intermediate data that can be processed to determine mobile station position, thereby simplifying the overall system requirements
Solution Approach 2:
The patent replaces the mechanical/physical beamforming system (requiring precise antenna calibration and positioning) with a signal processing approach based on carrier interference measurements. By substituting the physical beamforming mechanism with computational methods that analyze interference patterns across different carriers, the system achieves position determination without the complexity of perfectly calibrated antenna arrays
3Measurement precision
If interference measurement methods are used to provide total interference power, then interference level is measured, but location information cannot be derived
Solution Approach 1:
The patent segments the interference measurement process by measuring interference on individual carriers separately rather than providing a single total interference power value. By measuring interference on Carrier A, Carrier B, and Carrier C independently, the system creates segmented measurement data that contains spatial information, enabling position determination while maintaining accurate interference power measurement
Solution Approach 2:
The patent adds a new dimension to interference measurement by measuring interference across multiple carrier frequencies rather than just providing a single power value. This multi-dimensional measurement approach (measuring interference on different carriers) transforms the one-dimensional total power measurement into a multi-dimensional dataset that encodes location information through the spatial distribution of interference across frequencies
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A multicarrier communication method in which a first multicarrier signal being associated with a first communication cell and a second multicarrier signal being associated with a second communication cell are received. A first signal portion from the first multicarrier signal and a second signal portion from the second multicarrier signal are extracted in order to determine a first interference power on the first signal portion and a second interference power on the second signal portion. Information on the position of the mobile terminal is obtained from the interference power measurements which are also used to assign the available resources in interference coordination.