Apparatus and method for reducing power consumption in portable terminal

1. An apparatus for reducing power consumption in a portable terminal connected through an ad hoc network, the apparatus comprising:

a control unit for receiving a request from a neighboring terminal for transmission of digital broadcast data that is received by the portable terminal to the neighboring terminal, for controlling setting of a target delay time after receiving the request from the neighboring terminal, during the set target delay time, for controlling buffering of the received digital broadcast data for a predefined time and controlling transmission of the buffered received digital broadcast data, from the portable terminal to the neighboring terminal, after the buffering of the received digital broadcast data for the predefined time, and for controlling entering of a sleep mode during a part of the target delay time remaining after the transmission of the buffered received digital broadcast data.

2. The apparatus of claim 1 , wherein if the portable terminal transmits the received digital broadcast data to the neighboring terminal, the portable terminal wakes up for a portion of the set target delay time, transmits the buffered data, and then enters the sleep mode.

3. The apparatus of claim 2 , further comprising:

a beacon generating unit for generating an adaptive beacon interval to reduce power consumption by the portable terminal caused by a wake-up operation in an Announcement Traffic Indication Message (ATIM) window, after the portable terminal enters the sleep mode.

4. The apparatus of claim 3 , wherein the control unit reduces the number of times of performing a periodic wake-up operation and monitors the ATIM frame in the portable terminal, when there is no data communication between the portable terminal and the neighboring terminal.

5. The apparatus of claim 3 , wherein the beacon generating unit sets the adaptive beacon interval immediately after transmitting buffered data or at the time when preoccupying a beacon after the transmission of the buffered data.

6. The apparatus of claim 5 , wherein the adaptive beacon interval denotes the interval indicating the ATIM frame nonexistence interval during retransmission data transmission time except the buffered data transmission interval.

7. The apparatus of claim 5 , wherein the adaptive beacon interval corresponds to the data transmission interval minus the buffered data transmission time.

8. A method for reducing power consumption in a portable terminal connected through an ad hoc network, the method comprising:

receiving a request from a neighboring terminal to transmit digital broadcast data that is received by the portable terminal to the neighboring terminal, the request comprising:

setting a target delay time after receiving the request from the neighboring terminal,

buffering, during the set target delay time, the received digital broadcast data for a predefined time,

transmitting, during the set target delay time, the buffered received digital broadcast data to the neighboring terminal after the buffering of the received digital broadcast data for the predefined time, and

entering a sleep mode during a part of the target delay time remaining after the transmission of the buffered received digital broadcast data.

9. The method of claim 8 , further comprising:

waking up for a portion of the set target delay time to transmit the buffered data; and

entering a sleep mode after transmitting the buffered data.

10. The method of claim 9 , further comprising:

generating and transmitting an adaptive beacon interval to reduce power consumption by the portable terminal caused by a wake-up operation in an Announcement Traffic Indication Message (ATIM) window, after the portable terminal enters the sleep mode.

11. The method of claim 10 , further comprising:

reducing the number of times of performing a periodic wake-up operation for monitoring the ATIM frame in the portable terminal, when there is no data communication between the portable terminal and the neighboring terminal.

12. The method of claim 10 , wherein the adaptive beacon interval is set immediately after transmitting buffered data or at the time when preoccupying a beacon after the transmission of the buffered data.

13. The method of claim 10 , wherein the adaptive beacon interval denotes the interval indicating the ATIM frame nonexistence interval during data transmission time except the buffered data transmission interval.

14. The method of claim 10 , wherein the adaptive beacon interval corresponds to the data transmission interval minus the buffered data transmission time.