Adaptive Cell Search for High-Frequency Wireless Networks
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Solution Overview
Problem
High-frequency wireless communication systems face challenges in cell search and signaling due to varying regulatory requirements across different countries and frequency ranges, particularly in millimeter wave communication systems operating above 52.6 GHz, where traditional methods struggle to optimize power usage and bandwidth allocation efficiently.
Innovation Solution
A method and radio node design that adaptively perform cell search using multiple signaling bandwidths and numerologies, allowing for power-optimized signaling by switching between different frequency ranges and waveforms, such as OFDM and SC-FDM, to accommodate varying regulatory conditions and ensure reliable cell identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional cell search methods are used in high-frequency wireless communication systems, then the system can operate with fixed bandwidth settings, but it cannot efficiently optimize power usage and bandwidth allocation across different regulatory requirements and frequency ranges
Solution Approach 1:
The patent implements dynamic cell search by allowing the radio node to switch between different signaling bandwidths (first and second signaling bandwidths) based on the detected frequency range. The system dynamically adapts its operation mode - using the first signaling bandwidth for initial cell search and then switching to the second signaling bandwidth for subsequent operations, thereby resolving the contradiction between adaptability and complexity through dynamic configuration rather than fixed complex design
Solution Approach 2:
The patent changes the bandwidth parameter dynamically during cell search operations. By detecting whether the operating frequency falls within the first or second frequency range and accordingly selecting the appropriate signaling bandwidth, the system optimizes power usage and regulatory compliance without requiring a completely different cell search procedure for each regime, thus improving adaptability while managing complexity through parameter variation
2Reliability
If wider signaling bandwidth is used for cell search, then cell identification reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by using a first signaling bandwidth that is narrower than the full operational bandwidth for initial cell search. This allows the system to achieve sufficient cell identification reliability without immediately consuming maximum power. The system only switches to wider bandwidth (second signaling bandwidth) when necessary, such as when initial cell search fails or regulatory requirements demand it, thus optimizing the balance between reliability and power consumption
Solution Approach 2:
The system employs periodic cell search operations with different bandwidth configurations. The radio node performs initial cell search using the first signaling bandwidth, and only switches to the second signaling bandwidth for subsequent periodic searches when needed. This periodic adaptation allows the system to maintain reliability for cell identification while minimizing overall power consumption by using wider bandwidth only when absolutely necessary
3Adaptability or versatility
If multiple signaling bandwidths are supported, then compliance with diverse regulatory requirements is achieved, but the device complexity increases
Solution Approach 1:
The patent segments the cell search procedure into distinct phases: initial cell search using the first signaling bandwidth, and subsequent cell search using the second signaling bandwidth. This segmentation allows the system to handle different regulatory requirements for different frequency ranges (first and second frequency ranges) without requiring the entire device to be overly complex. Each phase uses appropriate bandwidth for its specific regulatory context, achieving compliance while managing complexity through procedural segmentation
Data Source
AI summary
A method of operating a radio node in a wireless communication network in which the method includes performing cell search on a first frequency range based on at least a first selected bandwidth of a set of signaling bandwidths, the set comprising at least a first signaling bandwidth and a second signaling bandwidth. The disclosure also pertains to related devices and methods.