Millimeter Wave Access Point Mobility Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Millimeter Wave Access Points have a limited coverage area due to high path loss at millimeter wave frequencies, making it difficult to detect and establish connections with user equipment, especially when they are not static or moving at low speeds, as existing solutions are not effectively adapted for these conditions.
Innovation Solution
A method where the Millimeter Wave Access Point monitors legacy frequency uplink reference signals to map signal strength and determine beamforming weights for establishing a millimeter wave connection, extending coverage by using narrow beams targeted at user equipment, and selectively determining beamforming weights based on user equipment position and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow beams with high gains are used to increase signal to noise ratio or coverage, then the signal quality improves, but the coverage area decreases and mobility robustness worsens
Solution Approach 1:
The system dynamically adapts beam width based on user equipment mobility state. For static or low-mobility users, narrow high-gain beams are used to maximize signal quality. For high-mobility users, broader beams are employed to maintain robustness during movement, thus resolving the contradiction between signal quality and coverage/mobility robustness
Solution Approach 2:
The beamforming parameters (beam width, direction) are changed based on detected user mobility and position. The system adjusts these parameters in real-time to optimize the balance between signal-to-noise ratio and coverage area, allowing the same system to serve both stationary and mobile users effectively
2Adaptability or versatility
If broad beams with less gain are used to increase robustness against mobility, then mobility robustness improves, but signal to noise ratio and coverage gain decrease
Solution Approach 1:
The system dynamically switches between broad and narrow beams based on user mobility detection. When users are detected as mobile, broad beams provide robustness; when users are static, narrow beams provide high signal quality. This dynamic adaptation resolves the contradiction by making the system versatile for different mobility scenarios
3Device complexity
If existing legacy network detection procedures are used for millimeter wave access point detection, then the detection procedure is simple, but detection range and coverage are limited causing delays
Solution Approach 1:
The system performs preliminary actions by having user equipment continuously monitor legacy frequency signals and prepare measurement configurations in advance. When a millimeter wave access point becomes available, the pre-prepared measurements enable immediate connection establishment, reducing delay without significantly increasing complexity
Solution Approach 2:
The legacy frequency signal acts as an intermediary that bridges the detection gap. User equipment uses the legacy frequency signal to detect and locate millimeter wave access points before actual millimeter wave connection is established, extending detection range and reducing establishment time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively extends the coverage area of Millimeter Wave Access Points, enabling faster and more direct connection establishment with user equipment, even when they are in motion, by using legacy frequency information to triangulate user equipment position and apply accurate beamforming.
Implementation Method 1
With the help of antenna arrays and beamforming techniques, highly directional beams are formed to increase the coverage range and compensate the path loss. This increases the signal to noise ratio and mitigates energy waste.
Implementation Method 2
Due to the shorter wavelengths in millimeter wave communication systems, very high order phased antenna arrays are possible with very low spatial dimensions.
Implementation Method 3
According to the Friis equation, the received power at distance R in free space is where P R is the received power and P T is the transmitted power, G T and G R represent the transmit and receive antenna gains, respectively and λ represents the wavelength.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for establishing a millimeter wave connection at a Millimeter Wave Access Point for a User Equipment is proposed. The method comprises the steps or monitoring a legacy frequency uplink reference signal, mapping the legacy frequency uplink reference signal strength to a millimeter wave access frequency and establishing a millimeter wave connection based on the mapping.