KR20130134256A - Method and system for traffic switching between du and ru - Google Patents

Method and system for traffic switching between du and ru Download PDF

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Publication number
KR20130134256A
KR20130134256A KR1020120057649A KR20120057649A KR20130134256A KR 20130134256 A KR20130134256 A KR 20130134256A KR 1020120057649 A KR1020120057649 A KR 1020120057649A KR 20120057649 A KR20120057649 A KR 20120057649A KR 20130134256 A KR20130134256 A KR 20130134256A
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South Korea
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unit
digital
radio
digital unit
radio unit
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KR1020120057649A
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Korean (ko)
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김형중
곽도영
이종식
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주식회사 케이티
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Publication of KR20130134256A publication Critical patent/KR20130134256A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0813—Configuration setting characterised by the conditions triggering a change of settings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

If a virtual server checks a state on each digital unit from a plurality of digital units linked thereto, the virtual server asks a second digital unit whether a radio unit connected to a first digital unit can be rearranged. If the virtual server receives a rearrangement response message, including information on the rearrangement possibility or not, from the second digital unit, the virtual server generates environment setting information of the digital unit corresponding to the radio unit and transmitting the environment setting information to the second digital unit. If the virtual server receives a environment setting response message from the second digital unit, the virtual server requests the radio unit to switch from the first digital unit to the second digital unit. [Reference numerals] (200-1) First digital unit;(200-2) Second digital unit;(200-3) Third digital unit;(300) Switch;(400-1) First radio unit;(400-2) Second radio unit;(400-3) Third radio unit;(400-4) Fourth radio unit;(400-5) Fifth radio unit

Description

Method and system for switching traffic between digital unit and radio unit {Method and system for traffic switching between DU and RU}

The present invention relates to a method and system for switching traffic between digital unit-radio units.

In order to improve the efficiency of network resources, Cloud Communication Center (CCC) technology is attracting attention. Cloud communication center technology not only significantly increases wireless data capacity, but also reduces operating costs and power.

Cloud communication center technology separates the digital unit (DU) from the existing base station to process the digital signal (DU: Digital Unit) and the radio unit (RU: Radio Unit) to process the digital signal in one equipment, and separate the digital unit in the country Focus on the DU center in place and install the radio unit remotely in the service area.

At this time, in the step of separating the digital unit and the radio unit, it is evolving into a virtualization structure using stacked digital unit pooling (DU Pooling). However, in the conventional structure in which one radio unit is physically connected to one digital unit, only network resource efficiency is possible through cooperative communication between a plurality of radio units under the control of a virtualization server, and physical load considering digital unit load is considered. Wireless traffic distribution is not possible.

In other words, traffic from one radio unit can only be processed in the digital unit to which the radio unit is connected. The problem is that there is no way to use it.

Accordingly, the present invention provides a method and system for switching traffic between a digital unit and a radio unit that maximizes the efficiency of the digital unit by switching the traffic of the radio unit according to the load ratio of the digital unit.

The method for switching the traffic between the digital unit and the radio unit in the virtualization server, which is one feature of the present invention for achieving the technical problem of the present invention,

Confirming a state of each digital unit from a plurality of digital units including the first digital unit and the second digital unit, the virtual server interworking with the virtual server; Querying the second digital unit for relocation to the radio unit that is connected with the first digital unit; When receiving a relocation response message including relocation information about the radio unit from the second digital unit, generating environment setting information of the digital unit corresponding to the radio unit and transmitting the reconfiguration response message to the second digital unit; And when the environment response message is received from the second digital unit, requesting switching from the first digital unit to the second digital unit by a switch that the radio unit and the plurality of digital units interoperate with. do.

Prior to the checking of the status, the method may include receiving status information of each digital unit from a plurality of digital units including the first digital unit and the second digital unit.

The checking of the state may include checking a load rate of the first digital unit and a load rate for each radio unit connected to the first digital unit from the state information; Identifying information of other digital units including the second digital unit that will receive a radio unit coupled to the first digital unit; Calculating the final load factor of the other digital units when the radio unit is relocated; And selecting a candidate digital unit to relocate the second radio unit.

After selecting the candidate digital unit, checking whether there are a plurality of radio units that can be relocated to the second digital unit among radio units connected to the first digital unit; And when the plurality of radio units that can be relocated, may include selecting a radio unit having a low load factor to be applied to the second digital unit as a relocation target.

The state information may include digital unit identification information, the number of radio units connected to the digital unit, the number of additionally acceptable radio units, and the load rate information that the radio unit applies to the digital unit.

The configuration information may include connection information between the first digital unit and the radio unit and shape information of a cell in which the radio unit provided a service.

After the enabling of the switch, the switch comprises: switching a line physically connected between the radio unit and the first digital unit to be connected between the radio unit and the second digital unit; And transmitting a switching result to the first digital unit and the second digital unit.

Traffic switching system for switching the traffic between the digital unit and the radio unit which is another feature of the present invention for achieving the technical problem of the present invention,

A radio unit for processing radio signals; A plurality of digital units physically connected to one or more radio units and processing digital signals; A virtualization server connected to the plurality of digital units, determining whether the digital unit is loaded and determining to switch the radio unit connected to the digital unit having the load to another digital unit; And a switch for switching the connection with the radio unit to the digital unit determined by the virtualization server.

The virtualization server may further include: a status information receiver configured to receive status information from each of the plurality of digital units or to receive an alarm signal due to an error from a digital unit in which an error occurs; The traffic processing load ratio for the plurality of digital units is calculated based on the state information, and a second digital unit to determine a relocation of the radio unit connected to the first digital unit in which the load is generated is determined to be relocated to the second digital unit. A digital unit status analyzer for querying and receiving a relocation response message from the second digital unit; Sending configuration information between the first digital unit and the radio unit to the second digital unit, requesting the environment setting so that the second digital unit can be connected to the radio unit, and setting the environment from the second digital unit. Environment setting information providing unit for receiving a response message; And a switching request unit which requests switching so that the radio unit is connected to the second digital unit by the switch.

The virtualization server may include a state information storage unit configured to store state information received by the state information receiver, a traffic processing load rate calculated by the digital unit state analyzer, and store identification information according to switching of the digital unit.

The digital unit may include: a state information transmitter for providing state information to the virtualization server; Receiving an inquiry message indicating whether relocation of any radio unit is possible from the virtualization server, a status check unit for determining whether to accept the arbitrary radio unit and transmitting a relocation response message indicating whether relocation is possible to the virtualization server. ; A message receiver configured to receive environment setting information from the virtualization server; And a radio unit connection unit for physically connecting to at least one radio unit and setting an environment for connection with the radio unit based on the environment setting information received by the message receiver.

The digital unit may include a message response unit which transmits an environment setting response message to the virtualization server when the environment setting is completed in the radio unit connection unit.

The switch may include a switching request receiving unit configured to receive switching request messages of arbitrary radio units and digital units from the virtualization server; And a switching unit that physically connects the radio unit and the digital unit based on the switching request message.

According to the present invention, the bottleneck of pooling due to the connection of the radio unit and the digital unit can be reduced.

In addition, even if the traffic is congested, it is possible to flexibly cope with the traffic processing by utilizing the resources of the digital unit to the maximum.

1 is an exemplary view showing a general system structure.
2 is an exemplary view showing an environment including a system according to an embodiment of the present invention.
3 is a structural diagram of a virtualization server according to an embodiment of the present invention.
4 is a structural diagram of a digital unit according to an embodiment of the present invention.
5 is a structural diagram of a switch according to an embodiment of the present invention.
6 is a flowchart illustrating a traffic switching method according to an embodiment of the present invention.
7 is a flowchart illustrating a step of checking the DU status according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) An access terminal (AT), and the like, and may include all or some of functions of a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, and the like.

In this specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS) Mobile Multihop Relay) -BS, and may include all or some of the functions of an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Hereinafter, a method and system for switching traffic in an environment in which a digital unit and a radio unit are separated according to an embodiment of the present invention will be described with reference to the drawings.

Before describing an embodiment of the present invention, a general system environment will be described with reference to FIG. 1.

1 is an exemplary view showing a general system structure.

As shown in FIG. 1, in a system in which the digital unit 10 and the radio unit 10 are separated, at least one radio unit is directly connected to one digital unit. The radio unit may be overloaded or fail depending on the load rate that one radio unit applies to the connected digital unit and the radio traffic processing load rate of the corresponding digital unit.

Accordingly, an environment in which the radio unit is switched to another digital unit according to the load of the digital unit according to an embodiment of the present invention will be described with reference to FIG. 2.

2 is an exemplary view showing an environment including a system according to an embodiment of the present invention.

As shown in FIG. 2, the radio units 400-1 to 400-5 and the digital units 200-1 to 200-3 are physically connected. The switch 300 is positioned between the radio units 400-1 to 400-5 and the digital units 200-1 to 200-3, and if a load occurs in the digital units 200-1 to 200-3, an overload occurs. Control the traffic of the radio unit connected to the digital unit to switch to another digital unit. In this case, the plurality of digital units 200-1 to 200-3 are managed as a digital unit pool.

The digital units 200-1 to 200-3 are the virtualization server 100, respectively, whether they are overloaded or digital unit identification information, the number of radio units connected to the digital unit, the number of radio units additionally accommodated, and the radio unit is digital. Digital unit status information including information such as load rate applied to the unit is transmitted. Based on this, the virtualization server 100 may select a digital unit to be newly connected to switch traffic destined for the digital unit under load.

In the embodiment of the present invention, the digital units 200-1 to 200-3, the virtualization server 100, and the switch 300 are referred to as traffic switching systems for convenience of description, but are not necessarily limited thereto. A digital unit to which an arbitrary radio unit 400-1 is connected is referred to as a first digital unit 200-1, and a digital unit to which a radio unit is newly connected is referred to as a second digital unit 200-2. .

The structure of the virtualization server 100, the switch 300, and the digital unit 200 in this environment will be described with reference to FIGS. 3 to 5.

3 is a structural diagram of a virtualization server according to an embodiment of the present invention. 4 is a structural diagram of a digital unit according to an embodiment of the present invention, and FIG. 5 is a structural diagram of a switch according to an embodiment of the present invention.

First, the virtualization server 100 will be described with reference to FIG. 3. The virtualization server 100 includes a state information receiving unit 110, a digital unit state analyzing unit 120, a state information storing unit 130, and an environment setting information system. Study 140 and switching request unit 150 is included.

The state information receiver 110 interworks with the virtualization server 100 and receives state information from a plurality of digital units including the first digital unit 200-1 and the second digital unit 200-2. The status information includes information such as digital unit identification information, the number of radio units connected to the digital unit, the number of additionally acceptable radio units, and the load rate applied to the digital unit by the radio unit. Will be explained. In addition, when a problem occurs in the software or hardware of any digital unit and the traffic cannot be processed, an alarm signal may be received from the digital unit.

The digital unit state analysis unit 120 calculates a traffic processing load rate based on the state information and checks which digital unit has a load. Then, the second digital unit 200-2 to change the first digital unit 200-1 having a load is selected, and the second digital unit 200-2 is inquired whether it is possible to relocate. When receiving a response to the relocation from the second digital unit 200-2, the state information is updated according to the received response. Here, the method for calculating the load factor is known, and detailed description thereof will be omitted in the exemplary embodiment of the present invention.

The state information storage unit 130 stores state information received by the state information receiving unit 110 and information such as traffic processing load ratio calculated by the digital unit state analysis unit 120. When the first digital unit 200-1 connected to an arbitrary radio unit is changed to the second digital unit 200-2 by the digital unit state analyzer 120, the second digital unit 200-2 may be used. Update and store identification information.

The environment setting information providing unit 140 includes information indicating that the second digital unit 200-2 is capable of relocating the radio unit 400-1 in the relocation response message received from the digital unit state analyzer 120. If it is present, environment setting information of the digital unit for the radio unit 400-1 to be rearranged is generated and transmitted to the second digital unit 200-2, which is a new digital unit. The environment setting information may include connection information between the first digital unit 200-1 and the radio unit 400-1 to which the first digital unit is connected, or shape information of a cell in which the radio unit 400-1 provided a service ( For example, cell ID, various parameters, and the like).

Such environment setting information is already known, and thus, detailed descriptions, such as a method of collecting environment setting information or generating environment setting information, will be omitted. The environment setting information providing unit 140 receives a response message for environment setting from the second digital unit 200-2.

When the switching requesting unit 150 receives a message indicating that the environment setting information providing unit 140 has completed setting of the environment from the second digital unit, the switching request unit 150 switches to connect the radio unit and the second digital unit to the switch 300. request.

Meanwhile, referring to FIG. 4, a structure of a digital unit 200 that is connected to a radio unit 400 and processes a digital signal by interworking with a switch 300 and a virtualization server 100 is described. The status information transmitter 210, the status checker 220, the message receiver 230, the radio unit connector 240, and the message responder 250 may be included.

The state information transmitter 210 transmits the information on the current state, that is, the packet throughput, the number of radio units connected to the digital unit, and whether the additional capacity is accommodated to the virtualization server 100.

When the status checking unit 220 receives a relocatable query message that asks the current status of the digital unit for asking whether to relocate any radio unit from the digital unit status analyzing unit 120 of the virtualization server 100, After determining whether the additional radio unit is acceptable, a relocation response message indicating whether relocation is possible or not is transmitted.

The message receiver 230 receives the environment setting information generated by the environment setting information providing unit 140 of the virtualization server 100.

The radio unit connector 240 physically connects at least one radio unit and the digital unit. When the message receiving unit 230 receives the environment setting information from the environment setting information providing unit 140 of the virtualization server 100, the message receiving unit 230 sets an environment for connection with the radio unit based on the environment setting information.

The message response unit 250 sets an environment for the radio unit added to the digital unit based on the environment setting information received from the message receiving unit 230, and the environment setting response message indicating that the setting is completed. To the virtualization server 100.

Meanwhile, referring to FIG. 5, the switch 300 for interworking with the virtualization server 100 and the digital unit 200-1 to switch to the new digital unit 200-2 for the radio unit 400-1 is described with reference to FIG. 5. The switch 300 includes a switching request receiving unit 310 and a switching unit 320.

The switching request receiver 310 receives a switching request message for requesting physical connection between the new digital unit and the radio unit from the switching request unit 150 of the virtualization server 100.

The switching unit 320 physically connects the digital unit and the radio unit according to the information received by the switching request receiving unit 310. In addition, a switching completion message indicating that the switching is successful is transmitted to the second digital unit to inform that the packet can be processed through the connection with the radio unit.

A method of switching traffic between the digital unit and the radio unit through the system described above will be described with reference to FIG. 6. In the embodiment of the present invention, for example, when it is determined that the overload occurs when the wireless load rate of the digital unit exceeds 80%, it is not necessarily limited to this.

6 is a flowchart illustrating a traffic switching method according to an embodiment of the present invention.

As shown in FIG. 6, the radio unit 400-1 is physically connected to the first digital unit 200-1 to provide a communication service to the terminal through a service such as packet processing (S100). At this time, the state information transmitter 210 of the first digital unit 200-1 collects state information of the first digital unit 200-1 (S110), and at a predetermined time interval, the first digital unit 200. -1) and transmits the status information to the virtualization server 100 to work with (S120). When the status information transmitter 210 transmits the status information to the virtualization server 100 in step S120, when a problem occurs in the first digital unit 200-1 in software or hardware, the packet cannot be processed. An alarm message indicating that an error has occurred may be transmitted to the first digital unit 200-1.

The state information receiver 110 of the virtualization server 100 interoperating with the plurality of digital units calculates a load ratio of the digital unit based on the state information transmitted from the digital units. The received state information is stored in the state information storage unit 130. At this time, the state information is stored and managed in the state information storage unit 130 in the form shown in Table 1 and Table 2 below.

DU number DU failure Prefecture acceptance RU /
Additional Acceptable RU DU Load Rate (%) DU # 1 no 2 / R-2 90 DU # 2 no 2 / R-2 55 DU # 3 no 1 / R-1 5 ... DU #N no R / 0 15

RU number Approved to DU
Load rate (%) Current connection DU number DU number changed RU # 1 60 DU # 1 No change RU # 2 30 DU # 1 RU # 3 20 DU # 2 No change RU # 4 35 DU # 2 No change RU # 5 5 DU # 3 No change ... RU #N 15 DU #N No change

Referring to the digital unit 200-1 indicated as "DU # 1" in Table 1, it can be seen that the digital unit is not in a hardware or software problem. The number of radio units currently connected to the digital unit is two, and the number of additional radio units that can be accommodated is R-2. Where R is the maximum number of radio units that can be accommodated per digital unit.

However, it can be seen that the overload occurred because the load ratio of the corresponding digital unit corresponds to 90%. At this time, the load rate of 90% corresponds to 60% and 30%, respectively, because the load rates of "RU # 1" and "RU # 2" connected to the digital unit labeled "DU # 1" correspond to 60% and 30%, respectively, as shown in Table 2. It shows the load rate for processing two radio units.

In addition, the digital unit labeled "DU #N" in Table 1 has a load rate of 15%, but since the number of additional acceptable radio units is 0, the digital unit can request to change the radio unit's connection to handle traffic. none.

When the state information receiver 110 of the virtualization server 100 detects the digital unit in which the load is generated in this manner, the digital unit state analyzer 120 checks the states of the interlocked digital units to further accommodate the radio unit. It is possible to determine which digital unit is possible and which radio unit to relocate (S130). In other words, referring to “DU # 1” in Table 1 as an example, the digital unit status analyzer 120 may identify which radio unit of two radio units (RU # 1, RU # 2) connected to DU # 1 is in which digital mode. Determine if you want to relocate to a unit. This will be described in detail with reference to FIG. 7 first.

7 is a flowchart illustrating a step of checking the DU status according to an embodiment of the present invention.

As illustrated in FIG. 7, the digital unit state analyzer 120 checks whether or not an error occurs and load rates of the plurality of digital units collected through the state information. Along with this, the radio load rate for each radio unit is also checked (S131). The radio load rate for each radio unit can be checked as shown in Table 2.

If an error occurs in the first digital unit, which is an arbitrary digital unit, or if a digital unit indicating a load ratio of 80% or more exists (S132), the load ratio of the radio unit connected to the first digital unit and the first radio units are determined. If relocated to calculate the final load rate of the other digital units (S133). Then, an arbitrary digital unit is selected according to the calculated final load ratio, and a radio unit target to be relocated to the corresponding digital unit is selected (S134).

The digital unit state analyzer 120 checks whether there is more than one radio unit to be relocated (S135), and if there is one radio unit, the corresponding radio unit is relocated (S136). However, if more than one radio unit is present, the radio unit having a small load factor among two radio units is selected for relocation and is relocated (S137).

Referring to Table 1 and Table 2 in particular with reference to DU # 1, since the overall load ratio of DU # 1 is 90% and has a load ratio greater than 80% set as a reference, the digital unit status analysis unit 120 is a DU Check that load has occurred in # 1. This will relocate the radio unit connected to DU # 1, ie check if there is a digital unit that can accommodate the additional radio unit.

In Table 1, DU # 2 and DU # 3 can accommodate two more and one radio unit respectively, but for DU #N there is no additional port to accommodate additional radio units. # 3 is a candidate. The final load rates of DU # 2 and DU # 3 are calculated when the radio unit connected to DU # 1 is relocated.

That is, there are two radio units of DU # 1 (RU # 1, RU # 2), and the final load rate is calculated by adding the load rates of each radio unit and the load rates of DU # 2 and DU # 3. In the case of DU # 2, the load rate corresponds to 55% and the load ratios of 60% and 30% of RU # 1 and RU # 2, so that if one of the two radio units is relocated to DU # 2, Since the load rate is greater than the load rate, it is decided to relocate the radio unit to DU # 3.

Then select which of the two radio units will be relocated to DU # 3. Since RU # 1 shows a loading rate of 60% and RU # 2 shows a loading rate of 30%, in an embodiment of the present invention, it is decided to relocate RU # 2 showing a small load rate to DU # 3. This is to ensure that after the radio unit is relocated to the new digital unit, the radio load rate of the new digital unit does not overload.

In other words, when relocating RU # 1, the load rate of DU # 1 is reduced from 90% to 30%, and the load rate of DU # 3 is increased from 5% to 65%. When RU # 2 is relocated, the load rate of DU # 1 is reduced from 90% to 60%, and the load rate of DU # 3 is increased from 5% to 35%. Therefore, it is decided to relocate RU # 2 to DU # 3.

6, the digital unit state analyzer 120 selects DU # 3 as the digital unit to be relocated, and then inquires whether the radio unit can be relocated to the corresponding digital unit. (S140). This is because the data used to manage the virtualization server 100 to check the overload is not reflected the current state of the digital unit.

Therefore, the second digital unit 200-2 checks whether the radio unit can be relocated according to the inquiry of step S140, and transmits a response message to the virtualization server 100 (S160). In the embodiment of the present invention will be described with an example that can be rearranged radio unit.

When the digital unit state analysis unit 120 receives the radio unit relocation response message from the second digital unit 200-2 through step S160, the environment setting information providing unit 140 receives the second digital unit 200-2. After generating and confirming environment setting information of the first digital unit 200-1 and the radio unit to be transmitted (S170), it is transmitted to the second digital unit 200-2 (S180). The reason for transmitting the environment setting information to the second digital unit 200-2 is that the radio unit connected through the first digital unit 200-1 transmits shape information, etc. of a cell that it has serviced to the second digital unit ( This is because the service can be provided as it is without changing the environment setting information only after setting in 200-2).

When the message receiving unit 230 of the second digital unit 200-2 receives environment setting information through step S180, the radio unit connecting unit 240 forms an environment for connection with the radio unit based on the environment setting information. (S190). The message response unit 250 transmits an environment setting response message indicating that the environment setting is completed to the virtualization server 100 (S200).

The switching requesting unit 150 of the virtualization server 100 requests switching so that the second digital unit 200-2 and the radio unit of the first digital unit 200-2 can be physically connected to the switch 300. (S210). The switching unit 320 of the switch 300 switches lines so that the second digital unit 200-2 and the radio unit are physically connected, and the switching result is converted into the first digital unit 200-1 and the second digital unit. S200 and S235 are respectively transmitted (S230 and S235).

Receiving the switching result, the first digital unit 200-2 changes the state to a lock state (lock) so that the terminal is connected to an existing cell which is connected to the radio unit to provide a service and cannot use the service (S240). The second digital unit 200-2 unlocks the state so that the terminals are connected through the new cell in order to be connected with the radio unit to provide a service (S250). Then, the radio unit is connected to the second digital unit 200-2 to process traffic and provide a service to the terminal (S260).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (13)

In the method for the virtualization server to switch the traffic between the digital unit and the radio unit,
Confirming a state of each digital unit from a plurality of digital units including a first digital unit and a second digital unit and interworking with the virtualization server;
Querying the second digital unit for relocation to the radio unit that is connected with the first digital unit;
Receiving a relocation response message including relocation possibility information for the radio unit from the second digital unit, generating environment setting information of the first digital unit for the radio unit and transmitting the reconfiguration response message to the second digital unit; ; And
Receiving a configuration response message from the second digital unit, requesting a switch from the first digital unit to the second digital unit to a switch in which the radio unit and the plurality of digital units work together;
Traffic switching method comprising a. The method of claim 1,
Before the step of checking the status,
Receiving status information for each digital unit from a plurality of digital units including the first digital unit and the second digital unit
Traffic switching method comprising a. 3. The method of claim 2,
Checking the state,
Confirming a load ratio of the first digital unit and a load ratio for each radio unit connected to the first digital unit from the state information;
Identifying status information of other digital units including the second digital unit that will receive a radio unit coupled to the first digital unit;
Calculating the final load factor of the other digital units when the radio unit is relocated; And
Selecting a candidate digital unit to relocate the second radio unit
Traffic switching method comprising a. The method of claim 3,
After selecting the candidate digital unit,
Checking whether there are a plurality of radio units that can be relocated to the second digital unit among the radio units connected to the first digital unit; And
If there are a plurality of radio units that can be relocated, selecting a radio unit having a small load factor to be applied to the second digital unit as a relocation target;
Traffic switching method comprising a. 3. The method of claim 2,
The status information includes digital unit identification information, the number of radio units connected to the digital unit, the number of additionally acceptable radio units, and the load rate information that the radio unit applies to the digital unit. The method of claim 1,
The configuration information includes traffic information between the first digital unit and the radio unit, the traffic switching method comprising the shape information of the cell that the radio unit provided a service. The method of claim 1,
After the step of causing the switch to switch,
Switching a line physically connected between the radio unit and the first digital unit to be connected between the radio unit and the second digital unit; And
Transmitting a switching result to the first digital unit and the second digital unit.
Traffic switching method comprising a. A traffic switching system for switching traffic between a digital unit and a radio unit,
A radio unit for processing radio signals;
A plurality of digital units physically connected to one or more radio units and processing digital signals;
A virtualization server connected to the plurality of digital units, determining whether the digital unit is loaded and determining to switch the radio unit connected to the digital unit having the load to another digital unit; And
A switch for switching the connection with the radio unit to the digital unit determined by the virtualization server
Traffic switching system comprising a. 9. The method of claim 8,
The virtualization server includes:
A status information receiver configured to receive status information from each of the plurality of digital units or to receive an alarm signal due to an error from a digital unit in which an error occurs;
The traffic processing load ratio for the plurality of digital units is calculated based on the state information, and a second digital unit to determine a relocation of the radio unit connected to the first digital unit in which the load is generated is determined to be relocated to the second digital unit. A digital unit status analyzer for querying and receiving a relocation response message from the second digital unit;
Sending configuration information between the first digital unit and the radio unit to the second digital unit, requesting the environment setting so that the second digital unit can be connected to the radio unit, and setting the environment from the second digital unit. Environment setting information providing unit for receiving a response message; And
A switching request unit requesting switching so that the radio unit is connected to the second digital unit by the switch;
Traffic switching system comprising a. 10. The method of claim 9,
The virtualization server includes:
A state information storage unit for storing the state information received by the state information receiver and the traffic processing load rate calculated by the digital unit state analyzer, and storing identification information according to switching of the digital unit;
Traffic switching system further comprising. 9. The method of claim 8,
The digital unit,
A status information transmitter for providing status information to the virtualization server;
Receiving an inquiry message indicating whether relocation of any radio unit is possible from the virtualization server, a status check unit for determining whether to accept the arbitrary radio unit and transmitting a relocation response message indicating whether relocation is possible to the virtualization server. ;
A message receiver configured to receive environment setting information from the virtualization server; And
A radio unit connection unit for physically connecting with at least one radio unit and setting an environment for connection with a radio unit based on environment setting information received by the message receiver.
Traffic switching system comprising a. 12. The method of claim 11,
The digital unit,
When the radio unit connection unit completes the configuration, the message response unit for transmitting an environment configuration response message to the virtualization server
Traffic switching system further comprising. 9. The method of claim 8,
Wherein the switch comprises:
A switching request receiving unit which receives a switching request message of an arbitrary radio unit and a digital unit from the virtualization server; And
A switching unit for physically connecting the radio unit and the digital unit based on the switching request message
Traffic switching system comprising a.
KR1020120057649A 2012-05-30 2012-05-30 Method and system for traffic switching between du and ru KR20130134256A (en)

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KR20150083362A (en) * 2014-01-09 2015-07-17 삼성전자주식회사 Apparatus and method for base tranceiver redundancy in a wireless communication system
EP2960894A1 (en) 2014-06-26 2015-12-30 LG Display Co., Ltd. Organic light emitting display for compensating for variations in electrical characteristics of driving element
US9349311B2 (en) 2014-06-27 2016-05-24 Lg Display Co., Ltd. Organic light emitting display for sensing electrical characteristics of driving element
US9542873B2 (en) 2014-06-27 2017-01-10 Lg Display Co., Ltd. Organic light emitting display for sensing electrical characteristics of driving element
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US10089928B2 (en) 2016-07-29 2018-10-02 Lg Display Co., Ltd. Organic light emitting display and sensing method therefor
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