Wireless Channel Coordination for Incompatible Bandwidths
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Solution Overview
Problem
The incompatibility in channelization between wireless communications systems in different countries, such as the US and China, leads to bandwidth wastage and coexistence issues due to differences in channel bandwidth and central frequency, hindering backward compatibility among devices.
Innovation Solution
A method where a coordinator in a wireless communication system determines physical parameters of multiple channels, broadcasts channel-adjustment messages with instructions on bandwidth and frequency adjustments, and manages a protection period to enable devices to switch between channels, ensuring coexistence and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If US channelization is used in China, then devices can maintain backward compatibility with US standards, but a significantly amount of bandwidth will be wasted
Solution Approach 1:
The patent implements dynamic channel parameters adjustment, where the wireless communication system can dynamically switch between different channel bandwidth configurations (20 MHz, 40 MHz, 80 MHz) and central frequencies based on regional requirements. This allows the system to adapt from fixed US channelization to flexible channelization that optimizes bandwidth usage in China while maintaining compatibility with US devices.
Solution Approach 2:
The patent changes physical parameters of the wireless channel, specifically the channel bandwidth and central frequency, to resolve the contradiction. By adjusting these parameters according to regional regulations (US vs China), the system achieves both backward compatibility with US devices and optimal bandwidth utilization in China without wasting spectrum resources.
2Productivity
If different channel bandwidths are used in different countries, then local bandwidth requirements can be met, but coexistence and backward compatibility among devices become difficult
Solution Approach 1:
The patent makes the wireless communication system universal by enabling it to support multiple channel configurations (different bandwidths and central frequencies) within the same system. The system can function in both US and China environments, supporting devices with different channelization requirements simultaneously through dynamic parameter adjustment and coordinated channel switching.
Solution Approach 2:
The patent introduces a coordination mechanism that acts as an intermediary between devices with different channelization requirements. The coordinator manages channel switching, broadcasts adjustment messages, and coordinates the protection period to ensure smooth transition and coexistence of devices operating on different channel bandwidths without interference.
3Productivity
If channel parameters are dynamically adjusted, then bandwidth efficiency and coexistence can be improved, but system complexity increases
Solution Approach 1:
The patent introduces a coordinator as an intermediary device that manages the complexity of dynamic channel parameter adjustment. The coordinator handles channel switching decisions, broadcasts adjustment messages to all devices, and manages the protection period timing. This centralizes the complexity in a single device rather than requiring every device to independently manage complex parameter adjustments, thereby reducing overall system complexity while maintaining bandwidth efficiency.
4Reliability
If a protection period is implemented for channel switching, then communication stability during transition is improved, but communication time is lost
Solution Approach 1:
The patent implements preliminary action by broadcasting channel adjustment messages before the actual channel switching occurs. The coordinator notifies all devices of the upcoming channel change and the protection period timing in advance, allowing devices to prepare for the transition. This preliminary notification reduces uncertainty and enables smoother switching, minimizing communication interruptions while maintaining stability during the transition.
Data Source
AI summary
A communication method that operates by determining a first set of physical parameters of a first channel by a coordinator in a wireless communication system; establishing communication with a first set of devices over the first channel; determining a protection period in accordance with a pre-determined rule; broadcasting a channel-adjustment message, wherein the channel-adjustment message comprises a set of instructions for indicating how to adjust from the first channel to a second channel, and the set of instructions comprise channel bandwidth information for indicating how to adjust to a bandwidth of the second channel and central frequency information for indicating how to adjust to a central frequency of the second channel; and communicating with a second set of devices over the second channel during the protection period.