Beam Index Dependent Positioning Beacon Sequence Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, particularly at millimeter wave (mmW) frequencies, propagation loss and beamforming challenges complicate accurate positioning methods, as traditional techniques are inadequate to handle the unique interference patterns and beam variability in MIMO systems.
Innovation Solution
A method for generating a positioning beacon sequence that ensures identical interference randomization regardless of the assigned beam index, by combining a link-dependent sequence and a beam-dependent sequence, ensuring consistent performance across different beams used for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning techniques are used in mmW frequency systems, then positioning functionality is provided, but interference variability and inter-cell cross-correlation increase due to beamforming and beam index assignments
Solution Approach 1:
The patent modifies the positioning beacon sequence generation by introducing a beam index-dependent parameter transformation. Specifically, it applies a cyclic shift to the base sequence based on the beam index, ensuring that the interference characteristics remain consistent across different beam assignments. This parameter change resolves the contradiction by maintaining reliable interference patterns while enabling accurate positioning measurements in beamformed mmW systems.
2Loss of energy
If beamforming is applied to address propagation loss in mmW systems, then signal coverage is improved, but interference randomization becomes beam-index-dependent
Solution Approach 1:
The patent applies local quality by making the positioning beacon sequence locally adapted to each beam index while maintaining global consistency in interference characteristics. The beam index is incorporated into the sequence generation process through a controlled transformation that ensures each beam experiences identical interference randomization properties, thereby resolving the adaptability issue while maintaining energy efficiency through beamforming.
3Ease of operation
If beam index assignment is used to identify different transmit beams, then beam directionality is achieved, but positioning performance varies across different beam indices
Solution Approach 1:
The patent achieves universality by designing a positioning beacon sequence generation method that works consistently across all beam indices. The beam index is used as a parameter in a standardized transformation process that ensures identical interference randomization properties for all beams, making the positioning performance universal and independent of the specific beam assignment while maintaining beam identification capability.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Disclosed are techniques for generating a positioning beacon sequence suitable for use in a wireless network that utilizes beamformed communication. More particularly, the positioning beacon sequence may be generated based on a first sequence that depends on a link identifier and does not depend on a beam index assigned to a beam used to transmit the positioning beacon in combination with a second sequence that depends on the beam index and does not depend on the link identifier. For example, the first sequence and the second sequence may be XORed to obtain the final beacon sequence, or the first sequence and the second sequence may be modulated and multiplied to obtain the final beacon sequence. Furthermore, in practice, the beacon sequence may be generated using a pseudo-random sequence generator initialized with a seed in which the link identifier and the beam index are treated as separate subcomponents.