Dynamic Resource Unit Allocation for Wi-Fi and Bluetooth Coexistence
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Solution Overview
Problem
Conventional wireless systems with collocated devices operating on different protocols, such as IEEE 802.11 and Bluetooth/BLE, face interference issues due to overlapping bandwidths, leading to reduced performance and restricted channel availability for Bluetooth/BLE operations.
Innovation Solution
Implementing a resource unit (RU) allocation mechanism where RUs can be designated as shared or non-shared, allowing Bluetooth/BLE to use frequencies when active and reverting them to IEEE 802.11 when inactive, and vice versa, to optimize channel usage and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WLAN 2.4 operates on a channel (e.g., CH9), then WLAN communication is enabled, but Bluetooth/BLE channels in the overlapping spectrum become unavailable, restricting Bluetooth/BLE operations
Solution Approach 1:
The patent implements dynamic channel allocation where the shared spectrum between WLAN and Bluetooth/BLE is not fixed but changes based on protocol activity. When Bluetooth/BLE is active, it can access channels that would otherwise be occupied by WLAN, and vice versa. This dynamic sharing mechanism allows the system to adapt channel availability in real-time, resolving the contradiction between WLAN reliability and Bluetooth/BLE adaptability
Solution Approach 2:
The system changes the operational parameters (channel availability) based on the active protocol. By monitoring which protocol is currently active and dynamically adjusting which channels are allocated to each protocol, the system optimizes performance for the active protocol while minimizing interference to the other, thus resolving the contradiction between reliable WLAN operation and versatile Bluetooth/BLE operation
2Power
If WLAN uses 40 MHz channels, then WLAN bandwidth is increased, but a large number of Bluetooth/BLE channels are interfered with, greatly restricting Bluetooth/BLE operations
Solution Approach 1:
The patent applies dynamic channel allocation to resolve the contradiction between WLAN bandwidth and Bluetooth/BLE channel availability. When Bluetooth/BLE operations are detected, the system dynamically restricts WLAN to narrower 20 MHz channels instead of using 40 MHz channels, thereby reducing interference to Bluetooth/BLE while maintaining adequate WLAN performance. This dynamic adjustment of channel width based on protocol activity enables both protocols to coexist effectively
3Reliability
If Bluetooth/BLE excludes bands corresponding to WLAN channels to avoid interference, then WLAN performance is maintained, but the number of channels available for Bluetooth/BLE AFH operations is reduced
Solution Approach 1:
The patent implements dynamic channel sharing where Bluetooth/BLE can access WLAN channels when WLAN is not actively transmitting. Instead of permanently excluding WLAN channels from Bluetooth/BLE operations, the system dynamically allows Bluetooth/BLE to use these channels during periods when WLAN is inactive, thereby increasing the number of available channels for Bluetooth/BLE AFH operations while maintaining WLAN reliability when needed
Data Source
AI summary
A method can include selecting a channel from a network operating according to a first protocol (e.g., an IEEE 802.11ax channel). Designating at least one portion of the channel as a shared resource unit (RU) and another portion as a dedicated RU. When an associated device is communicating according to a different protocol (e.g., a Bluetooth standard), allocating frequencies of the shared RU for use by the associated device and allocating the dedicated RUs for use by the network operating according to the first protocol.