Direction-Dependent Synchronization Signal Rates for mmWave Access
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Solution Overview
Problem
In millimeter wave (mmW) wireless communication systems, high path loss and non-line-of-sight losses pose challenges during the initial access stage, leading to reduced signal strength and increased block error rates due to misalignment of beam directions between base stations and user equipment (UEs).
Innovation Solution
The base station transmits initial access signals in different transmission directions with varying transmission rates, employing beamforming techniques to focus beams in specific directions and adjust rates based on priority, using multiple beams to cover a wider area and compensate for path losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform transmission rate is used in all directions, then system complexity is reduced, but signal strength and coverage are insufficient in high path loss directions
Solution Approach 1:
The patent applies local quality by configuring different transmission rates for different transmission directions based on path loss characteristics. Specifically, directions with higher path loss are assigned higher transmission rates, while directions with lower path loss use lower transmission rates, optimizing signal strength locally for each direction rather than using a uniform rate globally.
Solution Approach 2:
The patent changes the transmission rate parameter according to the transmission direction and path loss conditions. The base station dynamically adjusts the transmission rate based on the specific directional characteristics, transforming a static uniform rate into a dynamic direction-dependent rate to improve reliability without excessive complexity.
2Reliability
If beam direction alignment is improved, then block error rate is reduced, but initial access complexity increases due to multi-beam scanning
Solution Approach 1:
The patent applies preliminary action by performing beam direction alignment and determining optimal transmission directions during the initial access stage before actual data transmission begins. The base station pre-configures transmission rates for different directions based on preliminary beam scanning results, so that when UEs connect, the optimal parameters are already in place, reducing block error rates without adding complexity to ongoing transmissions.
3Area of stationary object
If multiple beams are used to cover wider area, then coverage is improved, but interference between beams increases
Solution Approach 1:
The patent applies local quality by assigning different transmission rates to different beams based on their specific directional coverage areas and interference characteristics. Beams covering areas with higher interference or path loss use higher transmission rates, while beams in less challenging directions use lower rates, optimizing coverage while managing interference through localized rate adjustment rather than uniform treatment.
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 approach enhances signal strength and reduces block error rates by aligning beams with UEs, improving communication efficiency and coverage in mmW systems.
Implementation Method 1
employing beamforming techniques to focus beams in specific directions and adjust rates based on priority
Data Source
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AI summary
The base station that is configured to transmit in a beamformed manner may set different transmission rates for different directions of the beams. During an initial access stage, the base station may set different transmission rates for different transmission directions, and may transmit initial access signals based on the transmission rates in the different transmission directions The apparatus may be a base station. The base station determines transmission rates for a plurality of transmission directions, where each transmission rate is determined for a respective transmission direction of the plurality of transmission directions. The base station transmits at least one initial access signal in each of one or more of the plurality of transmission directions based on a corresponding transmission rate of the transmission rates.