Dynamic Channel Scanning in Wireless Networks
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Solution Overview
Problem
Current wireless communication networks, particularly those compliant with IEEE 802.11 standards, face challenges in dynamically identifying the best channel for optimal performance during normal operation, rather than just at startup, due to factors like overlapping base service sets, interference, and radar presence.
Innovation Solution
Implementing a method to scan channels during operational mode, allowing for the selection of the best channel for data communication by measuring quality factors such as overlapping BSSs and interference levels, and switching channels without terminating communication links, using multiple antennas and dual concurrent modes to perform channel scanning simultaneously with data communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel scanning is performed during normal operation mode, then channel quality optimization is improved, but system complexity and overhead increase
Solution Approach 1:
The patent performs channel scanning during startup mode before normal operation begins, establishing a baseline channel quality assessment in advance. This preliminary action allows the system to have channel quality data ready before intensive data communication starts, reducing the need for frequent scanning during operation and thereby lowering overall system complexity while maintaining optimization capability
Solution Approach 2:
The patent implements channel scanning at periodic intervals during normal operation rather than continuously. The access point performs scanning at predetermined times (e.g., during beacon transmission intervals or at scheduled slots), allowing the system to balance between maintaining up-to-date channel quality information and minimizing interference with data communication, thus improving reliability without excessive complexity
2Reliability
If channel scanning is performed during data communication idle time, then communication continuity is maintained, but scanning time and frequency are reduced
Solution Approach 1:
The patent dynamically adjusts channel scanning operations based on the current communication state. During idle periods, the system performs channel scanning by switching to a different channel temporarily and then returning. The scanning depth and duration are adapted based on how long the idle period lasts, allowing the system to maximize scanning opportunities without compromising communication continuity, thereby maintaining reliability while optimizing the use of available scanning time
3Reliability
If dual concurrent mode is used for simultaneous scanning and communication, then channel monitoring is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the antenna resources into dedicated scanning antennas and dedicated data communication antennas. By physically separating these functions into different antenna elements, the system can perform channel scanning and data communication concurrently without requiring complex signal processing to separate the functions. This segmentation approach improves channel monitoring capability while keeping the device architecture relatively simple and manageable
Solution Approach 2:
The patent implements a dual concurrent mode where the wireless communication system can simultaneously perform data communication on one channel while scanning another channel for quality assessment. This multi-functionality allows the same hardware resources to serve multiple purposes at once, improving channel monitoring reliability without requiring entirely separate dedicated hardware for each function, thus balancing performance improvement with controlled complexity
Data Source
AI summary
A method and apparatus to select the best channel of a wireless network for data communication at any given time, during normal operation of the network, is described. The network may be an IEEE standard 802.11 compliant network. Channel scanning may be performed in any station on the wireless network, such as an access point (AP) or a mobile station, or both. Channel scanning may be performed during data communication idle time, or simultaneously with data communication on the network. The technique can be implemented in a multiple-input multiple-output (MIMO) communication system, where the antenna or antennas used for channel scanning can be selected dynamically during operation, to optimize one or more performance characteristics.