KR100941200B1 - Apparatus and method for managing trunk line in mobile communication system - Google Patents

Abstract

Disclosed are a system and method for managing a relay line using a virtual IP (internet protocol). According to this system and method, the control unit checks the load state of the plurality of relay lines, selects a usable first relay line, and assigns a virtual IP to a first interface connected to the selected first relay line. The first interface updates a mapping table of virtual IP addresses based on a gratuitous address resolution protocol (gARP) and selects a second relay line usable by a plurality of relay lines when a failure of the first relay line occurs. The control unit inherits the virtual IP to the second interface connected to the second relay line.

Mobile communication, BTS, BSC, trunk line, virtual IP

Description

Apparatus and method for managing a relay line in a mobile communication system {APPARATUS AND METHOD FOR MANAGING TRUNK LINE IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system, and more particularly, to an apparatus and method for managing a relay line between a base transmission subsystem (BTS) and a base station controller (BSC) in a mobile communication system.

In general, a mobile communication system includes a mobile station (MS), a base transmission subsystem (BTS), a base station controller (BSC), and a mobile switching center (MSC). The MS requests the BTS to set up a call for voice or data service, transmits voice or packet data input from the subscriber to the BTS through the radio section, and provides the subscriber with voice or packet data received from the BTS. The BTS receives a call setup request for voice or packet data service from the MS, requests the MSC to set up a call through the BSC, transmits voice or packet data received from the MS to the MSC, and receives a voice or Send packet data to MS. The BSC controls a plurality of BTSs to control call setup and data transmission between the BTSs and the MSCs. In addition, the BSC performs a signaling operation with the MSC, and performs a handoff. The MSC performs a call connection exchange function for call setup processing, performs a network interworking function with other MSCs, and provides various communication services through a computer network or an internet network through a network.

On the other hand, the BSC is connected to the BTS through a plurality of relay lines (for example, E1 relay lines). The BSC selects a predetermined number of relay lines for transmitting packets from the plurality of relay lines to the BTS, and transmits and receives packets with the BTS through the selected relay lines. Here, the packet includes a control signal or traffic (voice data or packet data). When the BSC detects a failure in transmitting and receiving a packet, the BSC selects a new relay line and transmits and receives a packet with the BTS.

However, even if a BSC detects a failure of a relay line and a newly established voice and data call allocates a new relay line, packets being transmitted to the BTS through the failed relay line are not transmitted to the BTS and are discarded.

According to the present invention, when a failure occurs in a relay line between a base transmission subsystem (BTS) and a base station controller (BSC), the packet transmitted to the BTS through the failed relay line is not delivered to the BTS and is discarded. Provided are a mobile communication system and a method for preventing using an internet protocol.

According to the present invention, a relay line management apparatus between a base station and a base station controller in a mobile communication system includes: an interface unit including a plurality of interfaces connected to a plurality of relay lines and performing relay line matching with the base station with an assigned unique IP; And checking a load state of the plurality of relay lines, selecting a usable first relay line, assigning a virtual IP to a first interface connected to the first relay line, and in case of failure of the first relay line, And a control unit operable to select an available second relay line and to inherit the virtual IP to a second interface connected with the second relay line.

In addition, according to the present invention, a plurality of interfaces connected to a plurality of relay lines in a mobile communication system and performs relay line matching with a base station using unique IPs assigned, virtual addresses assigned to the MAC addresses of the plurality of interfaces and the plurality of interface units. In a relay line management method of a relay line management apparatus including a switching unit and a control unit for switching packets based on an IP address mapping table, a) a first unit usable by checking a load state of the plurality of relay lines in the control unit; Selecting a relay line; b) assigning, by the controller, a virtual IP to a first interface connected to the first relay line; c) at the first interface, reflecting the virtual IP in the mapping table based on a gratuitous address resolution protocol (gARP); d) selecting, by the controller, a second relay line usable by the plurality of relay lines when a failure of the first relay line occurs; And e) in the controller, inheriting the virtual IP to a second interface connected to the second relay line.

According to the present invention, even if a failure occurs in at least one relay line in a plurality of relay lines between the base station and the base station controller, it is possible to continuously transmit a packet (control signal or traffic data) to the base station through another available relay line, thereby ensuring stability of the mobile communication system. And increase the reliability.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

1 is a schematic diagram illustrating a mobile communication system 100 to which a trunk line manager and a trunk line manager according to an exemplary embodiment of the present invention are applied. A mobile station (MS) 110 is connected to a base transmission subsystem (BTS) 120 via a wireless network. The base station controller (BSC) 130 is connected to the BTS 120 through a plurality of relay lines (E1 relay lines), and is connected to a mobile switching center (MSC) 140 through an Ethernet network. Connected. Meanwhile, the BSC 130 includes a relay line manager 200 for managing the relay line. In FIG. 1, the BSC 130 is connected to one BTS 120 and the MSC 140 is connected to one BSC 130 for convenience of description, but the BSC 130 is connected to a plurality of BTSs. It will be appreciated that the MSC 140 can be connected to multiple BSCs and other MSCs (not shown).

2 is a block diagram showing the configuration of the relay line management unit 200 according to an embodiment of the present invention. The interface unit 210 and the control unit 220 are connected through the switching unit 230. The interface unit 210 is connected to the BTS 120 through a plurality of relay lines 240a, 240b. The interface unit 210 includes LIUs (Link Interface Units) 210a, 210b,... 210n connected to the relay lines 240a, 240b. Each LIU 210a, 210b, ... 210n is assigned a unique IP. The switching unit 230 includes a storage unit 232 for storing the mapping table of the MAC address and the virtual IP address of each LIU (210a, 210b, ... 210n). Although not shown in FIG. 2, the relay line manager 200 includes a network gateway (NGW) for performing Ethernet matching with the MSC 140.

Hereinafter, the relay line management unit 200 according to the embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4. When the data service (voice data service and packet data service) of the mobile terminal 110 is started, the controller 220 checks the load state of the relay lines 240a, 240b, 240n, and can be used as shown in FIG. 3. The relay lines 240a and 240b are detected, and the virtual IPs VIP1 and VIP2 are assigned to the LIUs 210a and 210b of the detected relay lines 240a and 240b.

When the LIUs 210a and 210b of the interface unit 210 are assigned a virtual IP from the controller 220, the ARPs stored in the storage unit 232 of the switching unit 230 are based on a gratuitous address resolution protocol (gARP). Update the mapping table. In the present embodiment, the storage unit 232 may be implemented as an address resolution protocol cache (ARP) cache. The storage unit 232 stores the ARP mapping table as shown in Table 1 below. That is, VIP1 is mapped to the MAC address of LIU 131a and VIP2 is mapped to the MAC address of LIU 131b.

MAC address IP address Virtual IP address LIU (210a) IP1 VIP1 LIU (210b) IP2 VIP2 LIU (210c) IP3 … … … LIU (210n) IPn

When the controller 220 forms and outputs a packet including the virtual IP address of the destination LIU 210a or LIU 210b, the switching unit 230 refers to the ARP mapping table of the storage unit 232 to output the packet. Send to the destination. In this embodiment, the packet includes a control signal and traffic data (voice data or packet data).

Each LIU 210a and 210b periodically checks the state of each of the relay lines 240a and 240b while transmitting packets to the BTS 120 through the relay lines 240a and 240b. When the LIU 210a determines that a failure occurs in the relay line 240a, the LIU 210a transmits failure occurrence information indicating that a failure has occurred to the controller 220.

When the failure occurrence information is input from the LIU 210a, the controller 220 checks the load state of the relay lines 240b, ... 240n except for the faulted relay line 240a, and detects a usable relay line 240b to detect a new relay line. Select 240b. The controller 220 transmits a succession request of the virtual IP VIP1 allocated to the LIU 210a to the LIU 210b.

When the LIU 210b receives the succession request of the virtual IP from the control unit 220, the LIU 210b transmits the succession approval information to the control unit 220. In addition, the LIU 210b updates the ARP mapping table stored in the storage unit 232 of the switching unit 230 based on the gARP. That is, the ARP mapping table of the storage unit 220 is updated to map VIP1 and VIP2 to the MAC address of the LIU 131b as shown in Table 2 below.

MAC address IP address Virtual IP address LIU (210a) IP1 LIU (210b) IP2 VIP1, VIP2 LIU (210c) IP3 … … … LIU (210n) IPn

As a result, as shown in FIG. 4, the packet being transmitted to the BTS 120 through the LIU 210a and the relay line 240a may be continuously transmitted to the BTS 120 through the LIU 210b and the relay line 240b. Can be.

While the invention has been described and illustrated by way of preferred embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the appended claims.

1 is a block diagram illustrating a configuration of a mobile communication system to which a trunk line manager and a trunk line manager according to an exemplary embodiment of the present invention are applied.

Figure 2 is a block diagram showing the configuration of a relay line management unit according to an embodiment of the present invention.

3 is an exemplary view showing a relay line management unit to which a virtual IP is allocated according to an embodiment of the present invention.

Figure 4 is an exemplary view showing a relay line management unit for inheriting a virtual IP when the failure of the relay line in accordance with an embodiment of the present invention.

Claims (10)

delete An apparatus for managing a relay line between a base station and a base station controller in a mobile communication system, An interface unit connected to a plurality of relay lines, the interface unit including a plurality of interfaces for performing relay line matching with a base station using an assigned unique IP; Select a usable first relay line by checking a load state of the plurality of relay lines, assign a virtual IP to a first interface connected to the first relay line, and use the plurality of relay lines when a failure of the first relay line occurs; A control unit operable to select a possible second relay line and to inherit the virtual IP to a second interface connected with the second relay line; And A switching unit operable to switch packets by referring to a mapping table of the MAC addresses and the virtual IP addresses of the plurality of interfaces Relay line management device comprising a. The relay line management apparatus of claim 2, wherein the first interface is configured to reflect the virtual IP address to the mapping table based on a gratuitous address resolution protocol (gARP) when the virtual IP is allocated from the controller. The method of claim 2, wherein the first interface is operative to periodically check the state of the first relay line and to transmit failure occurrence information of the first relay line to the controller when a failure occurs in the first relay line. When the failure occurrence information is received from the first interface, the controller allocates the second relay line, transmits a succession request of the virtual IP to the second interface, and receives a succession response from the second interface. A relay line management device operable to inherit the virtual IP to the second interface. The relay line management apparatus of claim 4, wherein the second interface is configured to transmit succession response information to the controller in response to the succession request, and to update the mapping table based on a gratuitous address resolution protocol (gARP). delete In the mobile communication system, a plurality of interfaces connected to a plurality of relay lines and assigned to a plurality of interfaces to perform relay line matching with a base station, a mapping table of MAC addresses of the plurality of interfaces and virtual IP addresses assigned to the plurality of interface units. A relay line management method of a relay line management apparatus including a switching unit and a controller for switching packets on the basis of: a) checking, by the controller, a load state of the plurality of relay lines and selecting a usable first relay line; b) assigning, by the controller, a virtual IP to a first interface connected to the first relay line; c) at the first interface, reflecting the virtual IP in the mapping table based on a gratuitous address resolution protocol (gARP); d) periodically checking a state of the first relay line at the first interface; e) transmitting, at the first interface, failure occurrence information of the first relay line to the controller when a failure occurs in the first relay line; f) selecting, by the control unit, a second relay line usable in the plurality of relay lines when a failure of the first relay line occurs; And g) in the control unit, inheriting the virtual IP to a second interface connected to the second relay line Relay line management method comprising a. The method of claim 7, wherein step g) g1) sending a succession request of the virtual IP to the second interface; g2) inheriting the virtual IP to the second interface when a succession response is received from the second interface; Relay line management method comprising a. The method of claim 8, wherein before step g2), In the second interface, if a succession request of the virtual IP is received from the controller, transmitting succession response information to the controller; Relay line management method comprising a. The method of claim 9, Updating, at the second interface, the mapping table based on a gratuitous address resolution protocol (gARP) Relay line management method further comprising.

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