Positioning Reference Signal Generation for 5G OTDOA
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Solution Overview
Problem
The OTDOA positioning technology is ineffective in 5G scenarios due to the reduced cyclic prefix (CP) length caused by increased subcarrier spacing, leading to interference between positioning reference signals and communication data, limiting the distance measurement range and accuracy.
Innovation Solution
A method to generate a positioning reference signal by transforming multiple system symbols into one positioning symbol, effectively increasing the CP length, using a positioning frequency domain sequence based on time-frequency resource information and system configuration, including the number of allocated system symbols and positioning subcarrier spacing, to enhance the CP length and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subcarrier spacing is increased to support flexible 5G configurations, then system adaptability is improved, but cyclic prefix length is reduced leading to signal interference
Solution Approach 1:
The patent merges multiple consecutive system symbols (Nprsslot symbols) into a single positioning reference signal symbol. By combining the cyclic prefixes of these multiple symbols, the effective CP length is extended from the original short duration to Nprsslot times longer, thereby maintaining sufficient guard interval even when individual symbol CP lengths are reduced due to large subcarrier spacing.
Solution Approach 2:
The patent transforms the positioning reference signal from the time domain to the frequency domain and back. By generating the positioning frequency domain sequence based on time-frequency resource information and system configuration, then transforming to time domain to produce positioning time domain data, the patent creates a new dimensional approach to extend CP effectiveness without changing the underlying subcarrier spacing configuration.
2Speed
If cyclic prefix length is reduced due to large subcarrier spacing, then symbol duration is shortened improving system speed, but positioning reference signal interference with communication data increases
Solution Approach 1:
The patent combines Nprsslot consecutive system symbols into one positioning symbol, effectively merging their cyclic prefix resources. This creates an extended guard interval that prevents interference between positioning reference signals from different cells even when individual symbol durations are short, thereby maintaining signal separation without reducing transmission speed.
Solution Approach 2:
The patent performs preliminary generation of positioning frequency domain sequences based on time-frequency resource information and system configuration before actual signal transmission. This allows the system to pre-calculate appropriate positioning reference signals that account for the specific subcarrier spacing and CP length conditions, ensuring interference-free positioning measurements.
3Length of moving object
If arrival time difference between PRSs exceeds CP length, then measurement range is extended, but inter-symbol interference occurs affecting detection accuracy
Solution Approach 1:
By merging Nprsslot consecutive symbols into one positioning symbol with extended effective CP length, the patent increases the maximum allowable arrival time difference between PRSs from different cells. This extends the distance measurement range while maintaining measurement precision, as the extended CP prevents inter-symbol interference even when time differences are large.
Solution Approach 2:
The patent changes the effective cyclic prefix length parameter from its original value to Nprsslot times longer by combining multiple symbols. This parameter change allows the system to accommodate larger arrival time differences between positioning reference signals from different cells, thereby extending the usable distance measurement range without sacrificing positioning accuracy.
Data Source
AI summary
Provide are a positioning reference signal generation method and apparatus, a communication system and a storage medium. The method includes: generating a positioning frequency domain sequence according to time-frequency resource information and system configuration information, where the time-frequency resource information includes the number Nprsslot of allocated system symbols consecutive in time, and the system configuration information includes positioning subcarrier spacing Δfprs; and generating, based on the positioning frequency domain sequence, positioning time domain data consecutive in a time period of the Nprsslot consecutive system symbols.