PRS Transmission Window for Unlicensed Spectrum Reliability
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Solution Overview
Problem
In wireless communications systems, especially in unlicensed spectra, wireless devices face challenges in reliably transmitting positioning reference signals (PRS) due to inconsistent channel access, leading to incomplete or failed PRS transmissions.
Innovation Solution
The implementation of a window-based approach where multiple PRS transmission opportunities are identified within a channel access window, allowing devices to perform channel access procedures and transmit PRS signals during available opportunities, even if initial access is denied, thereby ensuring complete transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device performs channel access procedure in unlicensed spectrum, then the device can transmit PRS signals, but the channel access may be denied or inconsistent, leading to incomplete or failed PRS transmissions
Solution Approach 1:
The patent divides the PRS transmission process into multiple transmission opportunities within a window, rather than relying on a single transmission attempt. This segmentation allows the device to try multiple times within the defined window, improving reliability while maintaining overall transmission completeness.
Solution Approach 2:
The patent establishes a pre-defined window containing multiple PRS transmission opportunities before the actual transmission attempt. This preliminary structure ensures that even if channel access is denied initially, the device has pre-allocated opportunities to transmit, guaranteeing completeness while improving reliability through multiple attempts.
2Reliability
If multiple PRS transmission opportunities are provided in a window, then transmission reliability improves, but the complexity of channel access procedures increases
Solution Approach 1:
The patent segments the transmission window into multiple discrete opportunities, each with clear start and end points. This segmentation simplifies the device complexity by providing a structured, predictable pattern for channel access attempts, rather than requiring continuous monitoring and decision-making.
Solution Approach 2:
The patent implements periodic PRS transmission opportunities at regular intervals within the window. This periodic structure reduces device complexity by establishing a rhythmic, predictable access pattern that is easier to implement and manage compared to irregular or continuous access procedures.
3Object-affected harmful factors
If the device waits for channel access before transmitting PRS, then channel collisions are avoided, but transmission delays occur and may result in missed positioning opportunities
Solution Approach 1:
The patent performs preliminary channel access attempts at the beginning of the window or at scheduled opportunities within the window. This allows the device to secure channel access in advance of the actual PRS transmission, avoiding both collisions and delays by having the access procedure completed before the critical transmission moment.
Solution Approach 2:
The patent separates the channel access procedure from the PRS transmission by providing multiple distinct opportunities within the window. This segmentation allows the access attempt and transmission to be decoupled, reducing the impact of access delays on the overall transmission timing and positioning accuracy.
Data Source
AI summary
Methods, systems, and devices for transmitting a positioning reference signal over a channel within a window including a set of positioning reference signal transmission opportunities. A device may identify the window and perform a channel access procedure to access the channel during the window. Based on performing the channel access procedure, the device may obtain access to the channel and determine that a portion of the positioning reference signal transmission opportunities are remaining within the window. The device may transmit a positioning reference signal during one or more of the remaining positioning reference signal transmission opportunities. In some cases, the device may refrain from transmitting a positioning reference signal during a portion of a positioning reference signal transmission opportunity even if the device gains access to the channel during that portion of the positioning reference signal transmission opportunity.