Wireless Positioning Reference Signal Patterns With Non-Adjacent Tone Mapping
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Solution Overview
Problem
Conventional techniques for transmitting reference signals for positioning in wireless communications systems are deficient, leading to limited frequency diversity and inability to adapt to varying conditions due to fixed patterns and potential puncturing of allocated resources.
Innovation Solution
A pattern is determined for assigning reference signals to frequency tones across multiple symbols, ensuring non-adjacent mapping and allowing for autonomous or configured assignment, enhancing adaptability and resilience to resource puncturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fixed patterns are used for reference signal transmission, then simplicity of implementation is maintained, but frequency diversity is limited and adaptability to varying conditions is reduced
Solution Approach 1:
The wireless device autonomously determines the reference signal pattern using pre-configured algorithms or lookup tables stored in its memory, without requiring real-time network configuration. This self-service approach enables the device to adapt to varying conditions independently, improving frequency diversity and adaptability while avoiding the complexity of continuous network coordination.
Solution Approach 2:
The patent employs multiple configurable parameters including comb offsets, cyclic shifts, and pattern indices that can be adjusted to generate different reference signal patterns. By changing these parameters based on channel conditions and resource availability, the system achieves adaptability to varying conditions while maintaining a relatively simple determination mechanism through pre-defined relationships among parameters.
2Reliability
If reference signals are mapped to adjacent frequency tones in consecutive symbols, then resource allocation is simplified, but frequency diversity is reduced and resilience to resource puncturing is compromised
Solution Approach 1:
The reference signal pattern is segmented across multiple frequency tones with intentional gaps between them. Instead of mapping to contiguous tones, the patent assigns reference signals to non-adjacent frequency tones within symbols and across consecutive symbols, creating a distributed pattern that provides frequency diversity and resilience against puncturing while using systematic segmentation rules to maintain simplicity.
Solution Approach 2:
The patent introduces asymmetric spacing between reference signal frequency tones, where the separation distance varies according to configured parameters such as comb level and cyclic shift values. This asymmetric assignment creates a more robust pattern against puncturing compared to uniform spacing, while the asymmetry is controlled through simple parameter adjustments rather than complex calculations.
3Adaptability or versatility
If autonomous pattern determination is implemented, then adaptability and frequency diversity are improved, but device complexity increases due to algorithm implementation requirements
Solution Approach 1:
The patent pre-configures multiple reference signal patterns and their corresponding determination algorithms in the wireless device's memory before operation. The device simply selects and applies the appropriate pre-configured pattern based on received configuration information or predefined criteria, rather than performing complex real-time pattern generation. This preliminary preparation enables autonomous adaptability while keeping runtime complexity low.
Solution Approach 2:
The patent uses lookup tables that store pre-computed pattern parameters and configuration data. Instead of performing complex calculations autonomously, the device copies relevant parameter sets from these lookup tables based on simple index selection, achieving autonomous pattern determination with minimal computational complexity. The lookup tables act as pre-fabricated solution templates.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for determining a suitable pattern for transmitting reference signals used for positioning on allocated resources. In particular, the pattern may be used to assign the reference signals to frequency tones across multiple symbols such that the frequency tones to which the reference signals are mapped in at least two consecutive symbols are non-adjacent (e.g., separated by at least one frequency tone). In some cases, a wireless device may determine the pattern used to assign reference signals used for positioning autonomously (e.g., based on configured algorithms or a look-up table), and, in other cases, a wireless device (e.g., a user equipment (UE)) may determine the pattern used to assign reference signals used for positioning based on a configuration received from another wireless device (e.g., a base station).