A system comprising: a first electronic device including a first wireless communication circuit; and a second electronic device including a second wireless communication circuit, wherein the first wireless communication circuit and second wireless communication circuit are configured to support a Bluetooth protocol, wherein the first wireless communication circuit is configured to: establish a wireless communication link with a source device, receive at least one packet data unit, PDU, from the source device, and transmit a first acknowledgement, ACK, signal including a channel access code to the source device after receiving the at least one PDU; and wherein the second wireless communication circuit is configured to: receive the at least one PDU from the source device while the first wireless communication circuit receives the at least one PDU in a state that a wireless communication link with the source device is not established, and start to transmit a first negative ACK, NACK, signal including the channel access code to the source device before the first wireless communication circuit starts to transmit the first ACK signal to the source device in response to the second wireless communication circuit failing to receive the at least one PDU from the source device. a first electronic device including a first wireless communication circuit; and a second electronic device including a second wireless communication circuit, wherein the first wireless communication circuit and second wireless communication circuit are configured to support a Bluetooth protocol, wherein the first wireless communication circuit is configured to: establish a wireless communication link with a source device, receive at least one packet data unit, PDU, from the source device, and transmit a first acknowledgement, ACK, signal including a channel access code to the source device after receiving the at least one PDU; and wherein the second wireless communication circuit is configured to: receive the at least one PDU from the source device while the first wireless communication circuit receives the at least one PDU in a state that a wireless communication link with the source device is not established, and start to transmit a first negative ACK, NACK, signal including the channel access code to the source device before the first wireless communication circuit starts to transmit the first ACK signal to the source device in response to the second wireless communication circuit failing to receive the at least one PDU from the source device. establish a wireless communication link with a source device, receive at least one packet data unit, PDU, from the source device, and transmit a first acknowledgement, ACK, signal including a channel access code to the source device after receiving the at least one PDU; and wherein the second wireless communication circuit is configured to: receive the at least one PDU from the source device while the first wireless communication circuit receives the at least one PDU in a state that a wireless communication link with the source device is not established, and start to transmit a first negative ACK, NACK, signal including the channel access code to the source device before the first wireless communication circuit starts to transmit the first ACK signal to the source device in response to the second wireless communication circuit failing to receive the at least one PDU from the source device. receive the at least one PDU from the source device while the first wireless communication circuit receives the at least one PDU in a state that a wireless communication link with the source device is not established, and start to transmit a first negative ACK, NACK, signal including the channel access code to the source device before the first wireless communication circuit starts to transmit the first ACK signal to the source device in response to the second wireless communication circuit failing to receive the at least one PDU from the source device.