High-Frequency Link Discovery Using Location-Based Precoder Selection
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Solution Overview
Problem
High-frequency link discovery in wireless networks is hindered by the need for directional beamforming, which complicates initial cell searching due to the large angular directional space that mobile devices and high-frequency access points must search to locate suitable antenna configuration parameters.
Innovation Solution
The method involves transmitting location parameters over a low-frequency interface to a low-frequency access point, which relays or communicates high-frequency antenna configuration parameters to the mobile device, allowing it to configure its high-frequency antenna array for efficient link discovery, or uses priori information stored in the mobile device to select precoders for link establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If directional beamforming is used for high-frequency transmissions, then signal range is improved, but cell searching complexity increases due to large angular directional space
Solution Approach 1:
The patent applies preliminary action by having the mobile device determine its spatial location and identify appropriate precoders before actual high-frequency link discovery. The device uses location parameters (GPS coordinates, cell ID, timing advance) to pre-select precoders from a database, avoiding the need to search through all possible beam directions during cell searching. This preliminary preparation significantly reduces the complexity of angular directional space search while maintaining the signal range benefits of directional beamforming.
2Reliability
If joint search over angular directional space is performed, then suitable antenna configuration parameters are found, but link discovery time increases
Solution Approach 1:
The system performs preliminary identification of precoders based on spatial location before link discovery. By using location parameters to pre-select appropriate precoders from a database, the system avoids time-consuming joint search over angular directional space during actual link discovery, while ensuring suitable antenna configuration parameters are selected based on the device's spatial position.
Solution Approach 2:
The patent uses a database that stores precoder configurations corresponding to different spatial locations. Instead of performing exhaustive search, the system copies or retrieves pre-determined precoder settings from the database based on the mobile device's location parameters, significantly reducing link discovery time while maintaining configuration suitability.
3Measurement precision
If exhaustive search of antenna configurations is performed, then optimal beam alignment is achieved, but processing time and computational resources increase
Solution Approach 1:
The system performs preliminary precoder identification using location parameters before link discovery. By determining the mobile device's spatial location and pre-selecting appropriate precoders from a database, the system achieves accurate beam alignment without requiring exhaustive search, thereby improving link establishment speed while maintaining measurement precision.
Solution Approach 2:
The patent extracts the essential information needed for beam alignment (spatial location parameters) and uses it to select precoders directly from a database, rather than performing exhaustive search of all antenna configurations. This extraction approach maintains beam alignment precision by using location-based selection while dramatically improving productivity through reduced processing time.
Data Source
AI summary
It is possible to achieve fast high-frequency link discovery by communicating location parameters identifying a spatial location of a mobile device over a low-frequency interface to a low-frequency access point (AP). The location parameters are then used to identify antenna configuration parameters (e.g., precoders, etc.) for communicating discovery signals between the mobile device and a high-frequency access point. In one embodiment, the low-frequency AP relays the location parameters to the high-frequency AP, which uses the spatial location of the mobile device to perform link discovery. In another embodiment, the low-frequency AP communicates high-frequency antenna configuration parameters to the mobile device over the low-frequency interface.