Bluetooth Frequency Hopping with Reserved Channels Under Interference

The patent applies preliminary action by pre-defining a reserved channel set that both primary and secondary devices will use regardless of interference conditions. This ensures that even when frequency hopping switching signaling cannot be received due to strong background noise, both devices have a guaranteed common frequency resource to fall back on, thereby maintaining communication link stability while still allowing interference avoidance when conditions permit.

The patent applies local quality by creating a specialized reserved channel set with specific properties (pre-agreed frequencies that both devices know) that differs from the general frequency hopping sequence. This local optimization ensures that critical communication functions can occur on these reserved channels even when the main frequency hopping sequence cannot be coordinated due to lost switching signaling, thus maintaining successful communication probability while preserving transmission efficiency on the main sequence when coordination succeeds.