Frequency Error Estimation for LTE-CDMA Single Radio Devices
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Solution Overview
Problem
Conventional wireless devices spend an unacceptable amount of time in IS-2000 mode to generate frequency error estimates for GPS, due to the inaccuracy of estimates in the quick paging channel timeline, which reduces call quality and data transfer speed.
Innovation Solution
A wireless communication device configured to operate preferentially in the LTE mode, with a frequency error unit providing estimates based on LTE signals, and switching to IS-2000 mode only when necessary for extended periods, allowing frequency error estimation in the IS-2000 mode to maintain GPS accuracy while minimizing time away from LTE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the device operates preferentially in LTE mode and switches to IS-2000 mode only for extended periods, then time spent in IS-2000 mode is reduced and device performance is improved, but GPS frequency error estimation accuracy may be compromised when switching between modes
Solution Approach 1:
The device performs frequency error estimation in advance during LTE operation before switching to IS-2000 mode. By pre-calculating and storing the frequency error estimate while in LTE mode, the device ensures GPS accuracy is maintained without needing to spend extended time in IS-2000 mode for estimation purposes.
Solution Approach 2:
The patent introduces a memory storage mechanism as an intermediary between the frequency error estimation process and GPS operation. The estimated frequency error value is stored in memory and reused during IS-2000 operation, eliminating the need for real-time estimation in IS-2000 mode and reducing time spent away from LTE.
2Measurement precision
If the device spends extended time in IS-2000 mode to generate accurate frequency error estimates, then GPS accuracy is maintained, but call quality and data transfer speed are reduced
Solution Approach 1:
Frequency error estimation is performed in advance during LTE operation before switching to IS-2000 mode. The pre-calculated estimate is stored in memory and reused during IS-2000 operation, eliminating the need for extended IS-2000 mode operation and maintaining high data transfer speeds.
Solution Approach 2:
The device maintains continuous operation in LTE mode for data transfer and communication tasks, interrupting only briefly for mode switching. The frequency error estimation is performed continuously or periodically during LTE operation, ensuring GPS accuracy without interrupting the main data transfer workflow.
3Adaptability or versatility
If the device switches to IS-2000 mode at predetermined intervals to check for incoming calls, then call reception capability is maintained, but time away from LTE operation increases
Solution Approach 1:
The device implements periodic switching to IS-2000 mode at predetermined intervals to check for incoming calls while maintaining preferential LTE operation. This periodic action balances call reception capability with minimizing time away from the higher-performance LTE mode.
Solution Approach 2:
Frequency error estimation is performed in advance during LTE operation before periodic switches to IS-2000 mode. This preliminary estimation ensures that even during periodic mode switching for call checks, GPS accuracy is maintained without requiring extended IS-2000 operation.
Data Source
AI summary
A single radio wireless communications device is contemplated in which the user equipment (UE) operates according to more than one radio access technology. The UE may operate preferentially according to a first radio access technology, and may switch to a different radio access technology at predetermined intervals to check for incoming calls. An error unit within the UE may provide frequency error estimates to a GPS unit during operation according to the first radio access technology based upon signals received in the first radio access technology, unless any time spent in the different radio access technology is longer that a predetermined duration. In response to the predetermined duration being met, the error unit may provide the frequency error estimation to the GPS unit based upon signals received in the different radio access technology.