Method for establishing connection by HNB
A method for establishing a connection of a home Node B (HNB), the method comprising the steps of: transmitting, by the HNB, an attachment request message including an identifier of a closed subscriber group (CSG) where the HNB is located and information on location of the HNB to an operation and maintenance center (OMC); selecting, by the OMC a device establishing a connection with the HNB using the information on location of the HNB; transmitting, by the OMC, an attachment response message including information on the device to the HNB; establishing, by the HNB, a connection with the selected device. With the method proposed in the present invention, a UE can switch between HNBs in the same CSG through interface X2. Meanwhile, such information as the radio resource management and so on can be exchanged between two HNBs.
1. A method for establishing a connection of a Home Node B (HNB) by an Operation and Maintenance Center (OMC), the method comprising steps of:
receiving, from the HNB, an attachment request message including an identifier of a Closed Subscriber Group (CSG) where the HNB is located and information on a location of the HNB;
if the HNB is first from the CSG to access a network, selecting a device establishing a connection with the HNB using the information on the location of the HNB, and
transmitting, to the HNB, an attachment response message including information on the device for establishing a connection between the selected device and the HNB and information necessary to establish an interface X2 for switching of HNBs in the CSG.
2. The method according to claim 1 , wherein the step of selecting the device establishing the connection with the HNB comprises:
selecting a Mobile Management Entity (MME) or a Serving Gateway (S-GW) according to one of the location of the HNB, load balancing, and a rule of reducing a possibility of changing the MME or the S-GW when an user equipment(UE) moves, wherein the information on the device indicates the selected MME or S-GW.
3. The method according to claim 1 , further comprising:
if the HNB has not accessed the network in the CSG, selecting a Mobile Management Entity (MME) or a Serving Gateway (S-GW) selected by the OMC for other HNBs in the CSG as the device, and
transmitting, to the other HNBs, an attachment response message including information on the selected device.
4. The method according to claim 1 , wherein the attachment response message includes an Internet Protocol (IP) address list of each of other HNBs in the CSG and information on other HNBs adjacent to the HNB.
5. A method for establishing a connection of a Home Node B (HNB), the method comprising steps of:
transmitting an attachment request message including an identifier of a Closed Subscriber Group (CSG) where the HNB is located and information on a location of the HNB to an Operation and Maintenance Center (OMC); and
receiving an attachment response message including information on a device establishing the connection with the HNB selected using the information on the location of the HNB, and establishing a connection with the selected device,
wherein the attachment response message includes information necessary to establish an interface X2 for switching of HNBs in the CSG.
6. The method according to claim 5 , wherein the information on the device indicates a Mobile Management Entity (MME) or a Serving Gateway (S-GW) selected according to one of the location of the HNB, load balancing, and a rule of reducing a possibility of changing the MME or the S-GW when an user equipment (UE) moves.
7. The method according to claim 6 , wherein if the information on the device indicates the MME, transmitting, a connection request message including an identifier of the HNB and an identifier of a Track Area Identifier (TAI) where the HNB is located, to the MME; and
receiving from the MME, a connection response message.
8. The method according to claim 7 , wherein the connection request message includes information on cells which are overlapped with the HNB or the CSG.
9. An Operation and Maintenance Center (OMC) for establishing a connection of a Home Node B (HNB), the OMC comprising:
a receiver for receiving, from the HNB, an attachment request message including an identifier of a Closed Subscriber Group (CSG) where the HNB is located and information on a location of the HNB;
a controller for, if the HNB is the first of the CSG to access a network, selecting a device establishing a connection with the HNB using the information on the location of the HNB; and
a transmitter for transmitting, to the HNB, an attachment response message including information on the device for establishing a connection between the selected device and the HNB and information necessary to establish an interface X2 for switching of HNBs in the CSG.
10. The OMC according to claim 9 , wherein the controller selects a Mobile Management Entity (MME) or a Serving Gateway (S-GW) according to one of the location of the HNB, load balancing, and a rule of reducing a possibility of changing the MME or the S-GW when an user equipment(UE) moves,
wherein the information on the device indicates the selected MME or S-GW.
11. The OMC according to on claim 9 , wherein if the HNB has not accessed the network in the CSG, the controller selects a Mobile Management Entity (MME) or a Serving Gateway (S-GW) selected by the OMC for other HNBs in the CSG as the device, and controlling the transmitter for transmitting, to the other HNBs, an attachment response message including information on the selected device.
12. The OMC according to claim 9 , wherein the attachment response message includes an Internet Protocol (IP) address list of each of other HNBs in the CSG and information on other HNBs adjacent to the HNB.
13. A Home Node B (HNB) for establishing a connection, the HNB comprising:
a transceiver for transmitting an attachment request message including an identifier of a Closed Subscriber Group (CSG) where the HNB is located and information on a location of the HNB to an Operation and Maintenance Center (OMC), receiving an attachment response message including information on a device establishing the connection with the HNB selected using the information on the location of the HNB, and establishing a connection with the selected device,
wherein the attachment response message includes and information necessary to establish an interface X2 for switching of HNBs in the CSG.
14. The HNB according to claim 13 , wherein the information on the device indicates information for a Mobile Management Entity (MME) or a Serving Gateway (S-GW) selected according to one of the location of the HNB, load balancing, and a rule of reducing a possibility of changing the MME or the S-GW when an user equipment(UE) moves.
15. The HNB according to claim 14 , wherein if the information on the device indicates the MME, transmitting, a connection request message including an identifier of the HNB and an identifier of a Track Area Identifier (TAI) where the HNB is located, to the MME; and
receiving from the MME, a connection response message.
16. The HNB according to claim 15 , wherein the connection request message includes information on cells which are overlapped with the HNB or the CSG.