Method and apparatus for establishing connection between devices by using bluetooth low energy technology

1. A method performed by a first device for inter-device reconnection in a wireless communication system using Bluetooth low energy technology, the method comprising:

entering from a connection state to a suspend state based on that a pre-established connection with a second device is disconnected;

performing a reconnection parameter negotiation procedure with the second device;

transmitting a trigger sequence including at least one trigger codeword for requesting a reconnection to the second device via a channel determined based on a result of the negotiation procedure,

wherein a length of the trigger sequence is differently allocated based on whether a PHY to which is applied to a transmission of the trigger sequence is a coded PHY or an uncoded PHY;

performing a beacon listening for receiving a beacon transmitted by the second device in response to the trigger sequence,

wherein transmitting the trigger sequence and performing the beacon listening are performed alternately and repeatedly until the first device receives the beacon from the second device,

wherein upon receiving the beacon, the reconnection is formed between the first device and the second device, and

wherein a state of the first device is transitioned from the suspend state to the connection state based on the formed reconnection.

2. The method of claim 1 , wherein

performing the negotiation procedure includes:

transmitting a first request message requesting scanning channel information for the trigger sequence to the second device; and

receiving a first response message including the scanning channel information from the second device in response to the first request message.

3. The method of claim 2 , wherein

the scanning channel information includes index information indicating at least one of three pre-defined advertising channels.

4. The method of claim 1 , wherein

performing the negotiation procedure includes:

transmitting a second request message requesting physical layer information used for transmission/reception of the trigger sequence to the second device; and

receiving a second response message including the physical layer information from the second device in response to the second request message.

5. The method of claim 4 , wherein

the physical layer information includes at least one of a transmission PHY parameter indicating a transmission preference physical layer, a reception PHY parameter indicating a reception preference physical layer, or a PHY option parameter designating an option for a physical layer.

6. The method of claim 1 , further comprising

generating the trigger codeword using an access address.

7. The method of claim 6 , wherein

based on a physical layer used for transmission/reception of the trigger sequence being the coded PHY, a relatively shorter bit is allocated to the trigger codeword than a case that the physical layer is the uncoded PHY.

8. A first device in a method for inter-device reconnection in a wireless communication system using Bluetooth low energy technology, the first device comprising:

a communication unit for wiredly and/or wirelessly transmitting/receiving a signal to/from an external device; and

a controller functionally connected with the communication unit, wherein the controller:

enters from a connection state to a suspend state based on that a pre-established connection with a second device is disconnected;

performs a reconnection parameter negotiation procedure with the second device;

transmits a trigger sequence including at least one trigger codeword for requesting a reconnection to the second device via a channel determined based on a result of the negotiation procedure,

wherein a length of the trigger sequence is differently allocated based on whether a PHY to which is applied to a transmission of the trigger sequence is a coded PHY or an uncoded PHY;

performs a beacon listening for receives a beacon transmitted by the second device in response to the trigger sequence,

wherein transmitting the trigger sequence and performing the beacon listening are performed alternately and repeatedly until the first device receives the beacon from the second device,

wherein upon receiving the beacon, the reconnection is formed between the first device and the second device, and

wherein a state of the first device is transitioned from the suspend state to the connection state based on the formed reconnection.