Bluetooth communication system, electronic device and Bluetooth chip having low power consumption
There is provided an electronic device having Bluetooth communication function. The electronic device confirms whether a current packet received in a receive slot is a retransmitted packet according to a SEQN bit in the packet header so as to determine whether to continuously turn on an RF receiver in the receive slot or early turn off the RF receiver to save power.
1. An electronic device, comprising:
an antenna, configured to receive a packet; and
a Bluetooth chip, configured to,
identify whether the packet in a receive slot is a retransmitted packet according to an SEQN bit of a header of the packet; and
stop continuously receiving payload of the packet behind the header of the packet in the receive slot after identifying that the SEQN bit of the header is not changed;
wherein
the Bluetooth chip comprises an RF receiver and a modem, and
when identifying that the packet is the retransmitted packet after identifying that the SEQN bit of the header is not changed, the Bluetooth chip is configured to
stop continuously receiving the payload behind the header of the packet in the receive slot by turning off at least one of the RF receiver and the modem, and
transmit an ACK in a transmit slot next to the receive slot.
2. The electronic device as claimed in claim 1 , wherein the Bluetooth chip is further configured to identify and record whether a CRC check of a previous packet is passed.
3. The electronic device as claimed in claim 2 , wherein when identifying (i) that the packet is the retransmitted packet after identifying that the SEQN bit of the header is not changed and (ii) that the CRC check of the previous packet is passed, the Bluetooth chip is further configured to not receive CRC data of the packet in the receive slot.
4. The electronic device as claimed in claim 1 , wherein the electronic device is a slave device of a Bluetooth communication system.
5. The electronic device as claimed in claim 1 , wherein
when identifying that another packet is a retransmitted packet after identifying that an SEQN bit of a header of the another packet is not changed, the Bluetooth chip is further configured to
stop continuously receiving payload of the another packet in another receive slot, and
either not transmit an ACK, or transmit an NACK, in another transmit slot next to the another receive slot.
6. The electronic device as claimed in claim 5 , wherein
the electronic device is a primary slave device of a Bluetooth communication system, and
the Bluetooth chip is configured to either not transmit the ACK, or transmit the NACK, in the another transmit slot next to the another receive slot when the primary slave device does not receive a secondary ACK in the another receive slot from a secondary slave device of the Bluetooth communication system.
7. A Bluetooth communication system, comprising:
a master device, configured to transmit a packet;
a first electronic device, configured to,
identify whether the packet in a receive slot is a retransmitted packet according to an SEQN bit of a header of the packet; and
stop continuously receiving payload of the packet behind the header of the packet in the receive slot after identifying that the SEQN bit of the header is not changed; and
a second electronic device;
wherein
the master device is configured to transmit an identical packet in response to not receiving an ACK of at least one of the first electronic device and the second electronic device;
the first electronic device or the second electronic device respectively comprises an RF receiver and a modem, and
when the first electronic device or the second electronic device identifies that the packet is the retransmitted packet after identifying that the SEQN bit of the header is not changed, the first electronic device or the second electronic device is configured to
stop continuously receiving the payload behind the header of the packet in the receive slot by turning off at least one of the RF receiver and the modem, and
transmit the ACK in a transmit slot next to the receive slot.
8. The Bluetooth communication system as claimed in claim 7 , wherein the first electronic device is further configured to identify whether a CRC check of a previous packet is passed.
9. The Bluetooth communication system as claimed in claim 7 , wherein
the first electronic device is a primary slave device,
the second electronic device is a secondary slave device, and
the master device is configured to transmit an identical packet in response to not receiving an ACK from the first electronic device or in response to receiving an NACK from the first electronic device.
10. The Bluetooth communication system as claimed in claim 9 , wherein when identifying (i) that another packet is a retransmitted packet after identifying that an SEQN bit of a header of the another packet is not changed and (ii) that a secondary ACK from the second electronic device is not received, the first electronic device is configured to
stop continuously receiving payload of the another packet in another receive slot, and
either not transmit the ACK, or transmit the NACK, in another transmit slot next to the another receive slot.