Method and apparatus for supporting discontinuous reception operation in mobile communication system

1. A method for supporting a Discontinuous Reception (DRX) operation in a Node B in a mobile communication system, the method comprising:

defining a second System Frame Number (SFN) where one cycle of a first SFN corresponds to one bit;

transmitting information on the second SFN to a User Equipment (UE);

determining a second SFN which is used to transmit a paging signal to the UE;

determining a first SFN which is used to transmit the paging signal in the determined second SFN; and

transmitting the paging signal to the UE at the determined first SFN.

2. The method of claim 1 , wherein the determined second SFN satisfies “(T M div N m )*(UE_ID mod N M )” and the determined first SFN satisfies “(T div N)*(UE_ID mod N)”, and

wherein the N M is min (T M , nB M ), the “N” is min (T, nB), the T M , nB M , T, and nB are DRX cycles of the UE, and UE_ID is an International Mobile Station Identity (IMSI).

3. The method of claim 1 , wherein the second SFN is added to one of a Master Information Block (MIB), an existing System Information Block (SIB), and a new SIB, and is then transmitted to the UE.

4. The method of claim 1 , wherein the UE corresponds to a machine-type communication device.

5. An apparatus for supporting a Discontinuous Reception (DRX) operation in a Node B in a mobile communication system, the apparatus comprising:

a transceiver for defining a second System Frame Number (SFN) where one cycle of a first SFN corresponds to one bit, and for transmitting information on the second SFN to a User Equipment (UE); and

a controller for determining a second SFN which is used to transmit a paging signal to the UE, for determining a first SFN which is used to transmit the paging signal in the determined second SFN, and for controlling the transceiver to transmit the paging signal to the UE at the determined first SFN.

6. The apparatus of claim 5 , wherein the determined second SFN satisfies “(T M div N m )*(UE_ID mod N M )” and the determined first SFN satisfies “(T div N)*(UE_ID mod N)”, and

wherein the N M is min (T M , nB M ), the “N” is min (T, nB), the T M , nB M , T, and nB are DRX cycles of the UE, and UE_ID is an International Mobile Station Identity (IMSI).

7. The apparatus of claim 5 , wherein the second SFN is added to one of a Master Information Block (MIB), an existing System Information Block (SIB), and a new SIB, and is then transmitted to the UE.

8. The apparatus of claim 5 , wherein the UE corresponds to a machine-type communication device.

9. A method for supporting a Discontinuous Reception (DRX) operation in a User Equipment (UE) in a mobile communication system, the method comprising:

receiving, from a Node B, information on a second System Frame Number (SFN), where one cycle of a first SFN corresponds to one bit;

monitoring the first SFN and the second SFN every cycle of the first SFN;

determining whether the second SFN includes a paging signal;

determining whether the first SFN corresponding to the second SFN includes the paging signal when the second SFN includes the paging signal; and

identifying the paging signal through the first SFN when the first SFN includes the paging signal.

10. The method of claim 9 , wherein a case in which the second SFN includes the paging signal corresponds to a case in which the second SFN satisfies “(T M div NM)*(UE_ID mod N M )” and a case in which the first SFN includes the paging signal corresponds to a case in which the first SFN satisfies “(T div N)*(UE_ID mod N)”,

wherein the N M is min (T M , nB M ), the “N” is min (T, nB), the T M , nB M , T, and nB are DRX cycles of the UE, and UE_ID is an International Mobile Station Identity (IMSI).

11. The method of claim 9 , wherein the second SFN is added to one of a Master Information Block (MIB), an existing System Information Block (SIB), and a new SIB, and is then transmitted to the UE.

12. The method of claim 9 , wherein the UE corresponds to a machine-type communication device.

13. An apparatus for supporting a Discontinuous Reception (DRX) operation in a User Equipment (UE) in a mobile communication system, the apparatus comprising:

a transceiver for receiving, from a Node B, information on a second System Frame Number (SFN), where one cycle of a first SFN corresponds to one bit; and

a controller for monitoring the first SFN and the second SFN every cycle of the first SFN, for determining whether the second SFN includes a paging signal, for determining whether the first SFN corresponding to the second SFN includes the paging signal when the second SFN includes the paging signal, and for identifying the paging signal through the first SFN when the first SFN includes the paging signal.

14. The apparatus of claim 13 , wherein the second SFN is added to one of a Master Information Block (MIB), an existing System Information Block (SIB), and a new SIB, and is then transmitted to the UE.

15. The apparatus of claim 13 , wherein a case in which the second SFN includes the paging signal corresponds to a case in which the second SFN satisfies “(T M div NM)*(UE_ID mod N M )” and a case in which the first SFN includes the paging signal corresponds to a case in which the first SFN satisfies “(T div N)*(UE_ID mod N)”,

wherein the N M is min (T M , nB M ), the “N” is min (T, nB), the T M , nB M , T, and nB are DRX cycles of the UE, and UE_ID is an International Mobile Station Identity (IMSI).

16. The apparatus of claim 13 , wherein the UE corresponds to a machine-type communication device.

17. A method for supporting a Discontinuous Reception (DRX) operation in a User Equipment (UE) in a mobile communication system, the method comprising:

receiving system information which includes a cell-specific DRX cycle from a Node B;

transmitting an attach request message, which includes a UE-specific DRX cycle and an indication for selecting a DRX cycle of a long cycle, to a Mobility Management Entity (MME);

selecting a longer cycle of the cell-specific DRX cycle and the UE-specific DRX cycle when receiving an attach response message from the MME; and

receiving a paging message from the Node B in the selected DRX cycle.

18. An apparatus for supporting a Discontinuous Reception (DRX) operation in a User Equipment (UE) in a mobile communication system, the apparatus comprising:

a transceiver for receiving system information which includes a cell-specific DRX cycle from a Node B, and for transmitting an attach request message to a Mobility Management Entity (MME), the attach request message including a UE-specific DRX cycle and an indication for selecting a DRX cycle of a long cycle; and

a controller for selecting a longer cycle of the cell-specific DRX cycle and the UE-specific DRX cycle when receiving an attach response message from the MME; and for controlling the transceiver to receive a paging message from the Node B in the selected DRX cycle.

19. A method for supporting a Discontinuous Reception (DRX) operation in a Node B in a mobile communication system, the method comprising:

transmitting system information which includes a cell-specific DRX cycle to a User Equipment (UE);

receiving a UE-specific DRX cycle and an indication for selecting a DRX cycle of a long cycle from a Mobility Management Entity (MME);

selecting a longer cycle of the cell-specific DRX cycle and the UE-specific DRX cycle; and

transmitting a paging message to the UE in the selected DRX cycle.

20. An apparatus for supporting a Discontinuous Reception (DRX) operation in a Node B in a mobile communication system, the apparatus comprising:

a transceiver for transmitting system information which includes a cell-specific DRX cycle to a User Equipment (UE), and for receiving a UE-specific DRX cycle and an indication for selecting a DRX cycle of a long cycle from a Mobility Management Entity (MME); and

a controller for selecting a longer cycle of the cell-specific DRX cycle and the UE-specific DRX cycle, and for controlling the transceiver to transmit a paging message to the UE in the selected DRX cycle.

21. A method for supporting a Discontinuous Reception (DRX) operation in a User Equipment (UE) in a mobile communication system, the method comprising:

determining whether a cell on which the UE is currently camping corresponds to a cell supporting a DRX cycle of a long cycle;

selecting a longer DRX cycle of a cell-specific DRX cycle and a UE-specific DRX cycle when the cell on which the UE is currently camping supports the DRX cycle of a long cycle; and

receiving a paging message from a Node B of the cell, on which the UE is camping, in the selected DRX cycle.

22. The method as claimed in claim 21 , further comprising: selecting a shorter DRX cycle of a cell-specific DRX cycle and a UE-specific DRX cycle when the cell on which the UE is currently camping does not support the DRX cycle of a long cycle.

23. An apparatus for supporting a Discontinuous Reception (DRX) operation in a User Equipment (UE) in a mobile communication system, the apparatus comprising:

a controller for determining whether a cell on which the UE is currently camping corresponds to a cell supporting a DRX cycle of a long cycle, and for selecting a longer DRX cycle of a cell-specific DRX cycle and a UE-specific DRX cycle when the cell on which the UE is currently camping supports the DRX cycle of a long cycle; and

a transceiver for receiving a paging message from a Node B of the cell, on which the UE is camping, in the selected DRX cycle.

24. The apparatus as claimed in claim 23 , wherein, when the cell on which the UE is currently camping does not support the DRX cycle of a long cycle, the controller selects a shorter DRX cycle of a cell-specific DRX cycle and a UE-specific DRX cycle.

25. A method for supporting a Discontinuous Reception (DRX) operation in a Mobility Management Entity (MME) in a mobile communication system, the method comprising:

receiving a request for a DRX cycle of a long cycle from a User Equipment (UE);

determining whether a cell on which the UE is camping supports a DRX cycle of a long cycle; and

transmitting a paging message to a Node B of the cell, on which the UE is camping, in a UE-specific DRX cycle when the cell on which the UE is camping supports a DRX cycle of a long cycle.

26. The method as claimed in claim 25 , further comprising: transmitting the paging message to the Node B of the cell, on which the UE is camping, in a predetermined cycle when the cell on which the UE is camping does not support a DRX cycle of a long cycle.

27. An apparatus for supporting a Discontinuous Reception (DRX) operation in a Mobility Management Entity (MME) in a mobile communication system, the apparatus comprising:

a transceiver for receiving a request for a DRX cycle of a long cycle from a User Equipment (UE); and

a controller for determining whether a cell on which the UE is camping supports a DRX cycle of a long cycle, and for controlling the transceiver to transmit a paging message to a Node B of the cell, on which the UE is camping, in a UE-specific DRX cycle when the cell on which the UE is camping supports a DRX cycle of a long cycle.

28. The apparatus as claimed in claim 27 , wherein, when the cell on which the UE is camping does not support a DRX cycle of a long cycle, the controller controls the transceiver to transmit the paging message the Node B of the cell, on which the UE is camping, in a predetermined cycle.