Mobile Device Uplink Intermodulation Distortion Mitigation
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Solution Overview
Problem
In LTE networks, concurrent transmission of uplink resource blocks in multiple carrier channels can cause intermodulation distortion, interfering with radio frequency receiving functions such as GNSS and Bluetooth signals, which is a challenge for accurate location estimation and emergency services.
Innovation Solution
A mobile device schedules the transmission of resource blocks in multiple carriers and tunes local oscillators to center frequencies or a frequency bisecting the highest and lowest frequencies of the allocated resource blocks to minimize intermodulation distortion, thereby reducing interference with RF receiving functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If concurrent transmission of uplink resource blocks in multiple carrier channels is performed, then uplink communication capacity is improved, but intermodulation distortion occurs that interferes with RF receiving functions
Solution Approach 1:
The patent applies local quality by making different parts of the transmission system have different properties: the first uplink carrier uses one set of transmission parameters while the second uplink carrier uses different parameters, particularly in resource block allocation and oscillator frequency tuning, to minimize intermodulation distortion in specific frequency regions that would affect RF receiving functions
Solution Approach 2:
The patent changes transmission parameters including oscillator frequencies, resource block allocations, and carrier frequencies to positions that avoid creating intermodulation products in the frequency ranges used by RF receiving functions. This involves tuning oscillators to center frequencies of resource blocks and adjusting resource block allocations to create frequency gaps
2Productivity
If resource blocks are allocated in multiple carriers for concurrent transmission, then data transmission efficiency is improved, but intermodulation distortion jams RF receiving functions like GNSS and Bluetooth
Solution Approach 1:
The patent segments the uplink transmission into multiple carriers with distinct resource block allocations and frequency ranges. By dividing the transmission spectrum into separate segments with controlled oscillator frequencies and resource block patterns, intermodulation products are pushed away from the frequency bands used by RF receiving functions like GNSS and Bluetooth
Solution Approach 2:
The patent introduces frequency gaps and spacing between resource blocks as intermediary elements that prevent direct interaction between transmission signals that would create harmful intermodulation. These frequency gaps act as buffers that eliminate intermodulation products while still allowing concurrent data transmission
3Productivity
If oscillators are tuned to center frequencies of resource blocks, then transmission efficiency is improved, but intermodulation distortion affects RF receiving functions
Solution Approach 1:
The patent applies asymmetry by using different oscillator frequency tuning strategies for different carriers and different resource block allocation patterns. The first carrier may use one oscillation frequency while the second carrier uses a different frequency, creating an asymmetric configuration that avoids symmetric intermodulation products that would fall into RF receiving bands
Data Source
AI summary
Methods and systems are disclosed for concurrent transmission or resource blocks allocated to a mobile device for transmission in uplink communication channels. In particular implementations, a mobile device may tune local oscillators and/or apply filtering of radio frequency transmission to reduce or mitigate intermodulation distortion potentially affecting one or more radio frequency receiving functions.