Adaptive Initial Synchronization Beam Sweep for mm-Wave Networks
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Solution Overview
Problem
In wireless communication systems, especially in mm-wave bands, the detection of synchronization signals by user equipment (UEs) is challenging due to the narrow beamwidth and severe propagation conditions, requiring spatial alignment between transmit and receive beams, which is inefficient with current omnidirectional synchronization signal transmission.
Innovation Solution
Implementing a method that combines exhaustive and optimized beam sweep cycles for initial synchronization, where exhaustive beam sweeps cover the entire service area and optimized sweeps cover subsets, dynamically adjusting parameters based on historical statistics and scanning delays to improve detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omnidirectional synchronization signal transmission is used, then coverage area is improved, but synchronization detection efficiency deteriorates in mm-wave bands
Solution Approach 1:
The patent segments the omnidirectional coverage into multiple directional beams, dividing the coverage area into discrete beam sectors that can be swept systematically. This segmentation allows the system to maintain comprehensive coverage while improving detection efficiency through structured beam sweeping patterns.
Solution Approach 2:
The patent implements dynamic beam sweeping where the beam direction changes over time to cover different spatial sectors. This dynamic adjustment of beam orientation enables the system to achieve both wide coverage and efficient detection by adaptively steering beams across the service area.
2Area of stationary object
If exhaustive beam sweep covering entire serving area is used, then synchronization coverage is improved, but scanning delay increases
Solution Approach 1:
The patent applies partial action by implementing optimized beam sweep patterns that cover only the most probable or critical sectors of the serving area, rather than exhaustively sweeping all directions. This partial coverage approach reduces scanning delay while maintaining adequate synchronization coverage for typical deployment scenarios.
Solution Approach 2:
The patent changes the beam sweep parameters such as beam width, sweep speed, and coverage angle to optimize the balance between coverage and delay. By adjusting these parameters, the system can reduce scanning time while maintaining sufficient coverage for the actual service area.
3Measurement precision
If beam sweep procedure is implemented for spatial alignment, then synchronization accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic beam sweeping where synchronization beams are transmitted at regular intervals rather than continuously. This periodic action maintains synchronization accuracy by periodically refreshing spatial alignment while significantly reducing energy consumption compared to continuous beam sweeping.
Solution Approach 2:
The system uses self-service by leveraging historical synchronization data and UE feedback to predict optimal beam directions, reducing the need for exhaustive beam sweeps. This allows the system to maintain accuracy with fewer energy-consuming sweep operations.
Data Source
AI summary
According to certain embodiments, a method in a network node is provided for adaptive initial synchronization beam sweep transmission. The method includes transmitting a plurality of initial synchronization beams with at least two different beam sweep cycles. At least one beam sweep cycle is an exhaustive beam sweep cycle and at least one beam sweep cycle is an optimized beam sweep cycle. The exhaustive beam sweep cycle covers all of a serving area of the cell and the optimized beam sweep cycle covers a subset of the serving area.