Method and system for waking up node B cell

1. A method for waking up a Node B (NB) cell, comprising:

when a User Equipment (UE) in an idle state arrives in an area of an NB cell in which the UE ever resided, but does not search out signals of the NB cell,

reporting, by the UE, Proximity Indication (PI) information to a network side through a specific Tracking Area Update (TAU) process; and

waking up the NB cell by the network side when determining that there is a need to wake up the NB cell according to footprint information which is reported by the UE and obtained in the specific TAU process,

wherein reporting, by the UE, the PI information to the network side through the specific TAU process comprises:

sending, by the UE, a specific TAU request to the network side,

wherein the TAU request carries the PI information and the footprint information of the NB cell in which the UE ever resided, and a value of the PI information is set in an Evolved Packet System (EPS) update type field.

2. The method according to claim 1 , further comprising:

returning, by the network side, a specific TAU accept message to the UE; and

setting an EPS update result field of the TAU accept message as PI acceptance.

3. The method according to claim 1 , further comprising:

returning a specific TAU reject message to the UE by the network side when determining that there is no need to wake up the NB cell; and

setting an EPS update result field of the TAU reject message as PI rejection.

4. The method according to claim 1 , wherein the waking up the NB cell by the network side when determining that there is need to wake up the NB cell comprises:

sending, by the network side, an energy-saving wakeup request message to an NB to which the cell in which the UE currently resides belongs, wherein the energy-saving wakeup request message carries the footprint information; and

sending, by the NB to which the cell in which the UE currently resides belongs, the energy-saving wakeup request message to a target Home NB according to information of the target Home NB cell indicated in the footprint information which is carried in the received energy-saving wakeup request message.

5. The method according to claim 4 , further comprising:

executing, by the NB to which the cell in which the UE currently resides belongs, a step of sending the energy-saving wakeup request message to the Home NB after determining that there is a need to wake up the target Home NB cell with reference to the related information of the target Home NB cell, the NB that the cell in which the UE currently resides belongs to executes a step of sending the energy-saving wakeup request message to the target Home NB.

6. The method according to claim 1 , wherein the waking up, by the network side, the NB cell when determining that there is a need to wake up the NB cell comprises:

sending, by the network side, the energy-saving wakeup request message to a target Home NB according to the information of the target Home NB cell indicated in the footprint information.

7. The method according to claim 2 , wherein the waking up the NB cell by the network side when determining that there is need to wake up the NB cell comprises:

sending, by the network side, an energy-saving wakeup request message to an NB to which the cell in which the UE currently resides belongs, wherein the energy-saving wakeup request message carries the footprint information; and

sending, by the NB to which the cell in which the UE currently resides belongs, the energy-saving wakeup request message to a target Home NB according to information of the target Home NB cell indicated in the footprint information which is carried in the received energy-saving wakeup request message.

8. The method according to claim 7 , further comprising:

executing, by the NB to which the cell in which the UE currently resides belongs, a step of sending the energy-saving wakeup request message to the Home NB after determining that there is need to wake up the target Home NB cell with reference to the related information of the target Home NB cell, the NB that the cell in which the UE currently resides belongs to executes a step of sending the energy-saving wakeup request message to the target Home NB.

9. The method according to claim 2 , wherein the waking up, by the network side, the NB cell when determining that there is need to wake up the NB cell comprises:

sending, by the network side, the energy-saving wakeup request message to the target Home NB according to the information of the target Home NB cell indicated in the footprint information.

10. A system for waking up a Node B (NB) cell, comprising:

a network side and a User Equipment (UE),

wherein the UE is configured to, when the UE in an idle state arrives in an area of an NB cell in which the UE ever resided, but does not search out signals of the NB cell, report PI information to the network side through a specific Tracking Area Update (TAU) process,

wherein the network side is configured to, when determining that there is a need to wake up the NB cell according to the footprint information which is reported by the UE and obtained in the specific TAU process, wake up the NB cell, and

wherein to report the PI information to the network side through the specific TAU process, the UE is configured to send a specific TAU request to the network side,

wherein the TAU request carries the PI information and the footprint information of the NB cell in which the UE ever resided, and a value of the PI information is set in an Evolved Packet System (EPS) update type field.

11. The system according to claim 10 , wherein the network side is further configured to, when determining that there is a need to wake up the NB cell, return a specific TAU accept message to the UE; and

the network side is further configured to, when determining that there is no need to wake up the NB cell, return a specific TAU reject message to the UE.

12. The system according to claim 10 , further comprising:

an NB to which the cell in which the UE currently resides belongs;

the network side is specifically configured to send an energy-saving wakeup request message to the NB to which the cell in which the UE currently resides belongs; and

the NB to which the cell in which the UE currently resides belongs is configured to send the energy-saving wakeup request message to the target Home NB according to information of the target Home NB cell indicated in the footprint information which is carried in the received energy-saving wakeup request message.

13. The system according to claim 12 , wherein, the NB to which the cell in which the UE currently resides belongs is further configured to determine that there is a need to wake up the target Home NB cell with reference to the related information of the target Home NB cell.

14. The system according to claim 10 , wherein the network side is specifically configured to send the energy-saving wakeup request message to the target Home NB according to the information of the target Home NB cell indicated in the footprint information.

15. The system according to claim 10 , wherein the network side is a Mobility Management Entity (MME); and

the NB cell is a Home NB cell, or an evolved Home NB cell, or a macro NB cell.

16. The system according to claim 11 , further comprising an NB to which the cell in which the UE currently resides belongs;

the network side is specifically configured to send an energy-saving wakeup request message to the NB to which the cell in which the UE currently resides belongs; and

the NB to which the cell in which the UE currently resides belongs is configured to send the energy-saving wakeup request message to the target Home NB according to information of the target Home NB cell indicated in the footprint information which is carried in the received energy-saving wakeup request message.

17. The system according to claim 16 , wherein,

the NB to which the cell in which the UE currently resides belongs is further configured to determine that there is a need to wake up the target Home NB cell with reference to the related information of the target Home NB cell.

18. The system according to claim 11 , wherein the network side is specifically configured to send the energy-saving wakeup request message to the target Home NB according to the information of the target Home NB cell indicated in the footprint information.