Method and device for transmitting and receiving data in wireless network

1. A method for transmitting data in a transmitting device of a wireless network which comprises at least the transmitting device, a receiving device, and a coordinator, the method comprising:

transmitting a plurality of data packets to the receiving device during a reserved channel time allocated by the coordinator, each of the plurality of data packet comprising a header, wherein each header of the plurality of data packets comprises a channel time extension (CTE) field, and wherein a CTE field of a last data packet among the plurality of data packets is set to a value to inform the receiving device whether or not the transmitting device will continue to transmit a data packet to the receiving device during an unreserved channel time, and wherein CTE fields of data packets other than the last packet among the plurality of data packets are set to “0”; and

transmitting a data packet to the receiving device during the unreserved channel time if the CTE field of the last data packet is set to “1”.

2. The method of claim 1 , wherein the unreserved channel time is a channel time which is not allocated to any devices by the coordinator.

3. The method of claim 1 , wherein the reserved or unreserved channel time comprises at least one channel time block.

4. The method of claim 1 , wherein the transmitting device sets a CTE field of the data packet transmitted during the unreserved channel time with the specific value to inform the receiving device that the transmitting device will continue to transmit a data packet to the receiving side during the unreserved channel time.

5. The method of claim 1 , wherein the data packet transmitted during the unreserved channel time has a header comprising a CTE field to indicate whether the transmitting device continues to transmit a data packet during the unreserved channel time.

6. An apparatus for transmitting data in a wireless network, the apparatus comprising:

a transmission unit for transmitting a plurality of data packets to a receiving device during a reserved channel time allocated by a coordinator, each of the plurality of data packets comprising a header, wherein each header of the plurality of data packets comprises a channel time extension (CTE) field; and

a channel resource control module for setting a CTE field of a last data packet among the plurality of data packets to a value to inform the receiving device whether or not the transmission unit will continue to transmit a data packet to the receiving device during an unreserved channel time, and wherein CTE fields of data packets other than the last packet among the plurality of data packets are set to “0”,

wherein the transmission unit transmits a data packet to the receiving device during the unreserved channel time if the CTE field of the last data packet is set to “1”.

7. The apparatus of claim 6 , wherein the transmission unit transmits a data packet to the receiving device during the unreserved channel time.

8. The apparatus of claim 7 , wherein the channel resource control module sets a CTE filed of the data packet transmitted during the unreserved channel time to “1” to inform the receiving device that a data packet continues to be transmitted to the receiving device during the unreserved channel time.

9. The apparatus of claim 7 , wherein the data packet transmitted during the unreserved channel time has a header comprising a CTE field to indicate whether a data packet continues to be transmitted to the receiving device during the unreserved channel time.

10. The apparatus of claim 6 , wherein the unreserved channel time is a channel time which is not allocated to any devices by a coordinator.

11. The apparatus of claim 6 , wherein the reserved or unreserved channel time comprises at least one channel time block.