Bluetooth Reconnection Semi-Connected State and Periodic Scan

The patent applies preliminary action by performing connection-related preparations in advance. Devices enter a semi-connected state where connection parameters and information are pre-negotiated and stored before actual data transmission begins. This allows the formal connection process to be skipped or significantly shortened when resuming communication, thereby reducing reconnection time while maintaining connection reliability through pre-established parameters.

The patent segments the connection process into distinct states: disconnected state, semi-connected state, and connected state. The semi-connected state is an intermediate stage where devices perform partial connection procedures and store necessary information without completing the full connection handshake. This segmentation allows devices to resume from the semi-connected state rather than starting from scratch, reducing reconnection time while ensuring reliability through proper state transitions.

The patent applies periodic action by implementing periodic listen periods and scan periods for reconnection attempts. Instead of continuous or simultaneous reconnection attempts, devices periodically check for opportunities to reconnect and perform reconnection procedures only during designated time windows. This periodic structure reduces collisions between multiple HIDs attempting reconnection while maintaining high device availability through frequent reconnection opportunities.

The patent applies preliminary action by having devices perform listen periods before actual reconnection attempts. During the listen period, devices detect whether other devices are attempting reconnection or whether the channel is busy. This preliminary detection prevents simultaneous transmission attempts that would cause collisions, while still allowing multiple devices to reconnect efficiently by coordinating their attempts based on channel conditions.