KR20200143055A - Base station and terminal for load balancing, and operating method of base station and terminal thereof - Google Patents

Abstract

The present invention may provide an operating method of a base station and the base station. According to the present invention, the operating method comprises: receiving first messages including information indicating whether the corresponding terminal supports a 5^th generation (5G) service from a plurality of terminals including a 4^th generation (4G) terminal and a 5G terminal; selecting the 5G terminal from among the plurality of terminals based on the first messages; determining a load for each serving frequency band for the plurality of terminals; adjusting parameters for load balancing of each 5G terminal and 4G terminal based on the load for each serving frequency band; and transmitting a second message containing the adjusted parameters.

Description

Base station, terminal, base station, and terminal operation method for load balancing {BASE STATION AND TERMINAL FOR LOAD BALANCING, AND OPERATING METHOD OF BASE STATION AND TERMINAL THEREOF}

The embodiments relate to a base station, a terminal, a base station, and a method of operating the terminal for load balancing.

4G (4 ^th generation) there is a 5G (5 ^th generation) communication system has been developed to meet the demand for wireless data traffic after the commercialization of the communication system, the increase. 5G communication systems are being operated to increase signal gain by using various techniques in order to overcome the problem of path loss due to characteristics of ultra-high frequency bands such as millimeter wave (mmWave). On the other hand, when the load of a specific cell is high, the quality of experience of users within the coverage of the cell may deteriorate. In particular, in the case of the Non-Stand Alone (NSA) structure that uses the 5G communication system and the LTE system for 4G together, load balancing for improving the transmission efficiency and reliability of the 5G terminal because it does not distinguish between the 4G terminal and the 5G terminal during load balancing. Technique is required.

According to an embodiment, in a Non-Stand Alone (NSA) system, a base station performs load balancing by separating a 4G terminal and a 5G terminal by setting different frequency priorities to each of the 4G terminal and the 5G terminal, In a specific frequency band, a 5G terminal may preferentially receive a service.

According to an embodiment, the load of the NSA system is automatically measured, and parameters for load balancing are actively changed and transmitted according to the measured load, thereby maximizing the speed and efficiency of load distribution.

According to an embodiment, when a 5G terminal is concentrated in a specific frequency band, frequency use efficiency is improved by rejecting a 5G terminal attempting a new connection or forcibly transitioning to another frequency band with a low load. Maximize and improve transmission reliability.

According to an embodiment, a method of operating a base station includes: receiving first messages including information indicating whether the corresponding terminal supports 5G service from a plurality of terminals including a 4G terminal and a 5G terminal; Selecting the 5G terminal from among the plurality of terminals based on the first messages; Determining a load for each serving frequency band for the plurality of terminals; Adjusting a parameter for load balancing of each of the 5G terminal and the 4G terminal based on the load for each serving frequency band; And transmitting a second message including the adjusted parameter.

Adjusting the parameter may include adjusting a priority for each serving frequency band that is set for each of the 5G terminal and the 4G terminal based on the load for each serving frequency band.

The adjusting of the priority for each serving frequency band includes setting a first frequency band having the least load among the serving frequency bands as a first priority for the 5G terminal based on the load for each serving frequency band. It may include steps.

The step of adjusting the priority for each serving frequency band may be performed after the first frequency band among the remaining frequency bands excluding the first frequency band having the least load among the serving frequency bands, based on the load for each serving frequency band. As a result, it may include setting a second frequency band having a small load as a first priority for the 4G terminal.

Adjusting the parameter may include adjusting a parameter for load balancing of a 5G terminal or a 4G terminal switched from an active state to an idle state among the plurality of terminals based on the load for each serving frequency band. have.

The step of selecting the 5G terminal includes selecting the corresponding terminal as the 5G terminal according to whether there is a first message including information indicating that the corresponding terminal supports the 5G service among the first messages. Can include.

The determining of the load for each serving frequency band is based on at least one of the number of terminals in the active state among the plurality of terminals and the number of available resource blocks for the terminals in the active state, the It may include determining a load for each serving frequency band for a plurality of terminals.

The method of operating the base station further includes transmitting a message to each of the plurality of terminals to inquire about a frequency band supported by the corresponding terminal and whether the corresponding terminal supports 5G service, and the first message Receiving the messages may include receiving the first messages from the plurality of terminals in response to the message.

The method of operating the base station includes comparing a load of a first frequency band serving the 5G terminal among the serving frequency bands with a preset reference value; And distributing the load of the new 5G terminal to access the first frequency band based on the comparison result.

The step of distributing the load of the 5G terminal may include rejecting an attempt to access the new 5G terminal in the first frequency band; Allocating a second frequency band having a lower load than the first frequency band to the new 5G terminal; And handover of the new 5G terminal to a cell other than the first cell corresponding to the first frequency band.

Transmitting the second message may include transmitting the second message to a terminal that has switched from an active state to an idle state among the plurality of terminals.

The first messages may further include information on a frequency band supported by the corresponding terminal.

According to an embodiment, a method of operating a terminal includes: receiving a second message including an adjusted parameter for load balancing from a base station; Determining a frequency band for communication with the base station based on the adjusted parameter; And receiving a service from the base station through the frequency band.

The method of operating the terminal includes: receiving, from the base station, a message for inquiring about a frequency band supported by the terminal and whether the terminal supports 5G service; And in response to the message, transmitting a first message including information indicating whether the terminal supports 5G service.

When the terminal is a 5G terminal, the parameter may be that a first frequency band having the least load among serving frequency bands of the base station is set as a first priority for the 5G terminal.

When the terminal is a 4G terminal, the parameter is a second frequency band having a lower load after the first frequency band among the remaining frequency bands excluding the first frequency band having the least load among the serving frequency bands of the base station. This may be set as the first priority for the 4G terminal.

According to an embodiment, the base station is based on a first message including information indicating whether the corresponding terminal supports 5G service from a plurality of terminals including a 4G terminal and a 5G terminal, the A processor for selecting a 5G terminal, determining a load for each serving frequency band for the plurality of terminals, and adjusting a parameter for load balancing of each of the 5G terminal and the 4G terminal based on the load for each serving frequency band; And a communication interface for receiving the first messages and transmitting a second message including the adjusted parameter.

The processor may adjust the priority for each serving frequency band set for each of the 5G terminal and the 4G terminal based on the load for each serving frequency band.

According to an embodiment, the terminal includes: a communication interface for receiving a second message including an adjusted parameter for load balancing from a base station; And a processor determining a frequency band for communication with the base station based on the adjusted parameter, and receiving a service from the base station through the frequency band.

According to one side, in the Non-Stand Alone (NSA) system, the base station sets different frequency priorities for the 4G terminal and the 5G terminal, thereby separating the 4G terminal and the 5G terminal to perform load balancing. In the frequency band, 5G terminals can be provided with priority services.

According to one side, it is possible to maximize the speed and efficiency of load balancing by automatically measuring the load of the NSA system and actively changing and transmitting parameters for load balancing according to the measured load.

According to one side, when 5G terminals are concentrated in a specific frequency band, frequency use efficiency is maximized by rejecting a 5G terminal attempting a new connection or forcibly transitioning to another frequency band with a lower load. And, transmission reliability can be improved.

1 is a diagram for describing a 5G system having a Non-Stand Alone (NSA) structure according to an embodiment.
2 is a flow chart illustrating a method of operating a base station according to an embodiment.
3 is a diagram illustrating an initial access call flow of a 5G terminal according to an embodiment.
4 is a view for explaining a method for a base station to perform load balancing for a 5G terminal in an idle mode according to an embodiment.
FIG. 5 is a diagram for explaining a method for a base station to adjust a parameter for load balancing of a 4G terminal and a 5G terminal according to an embodiment.
6 is a flowchart illustrating a method of operating a base station according to another embodiment.
7 is a flowchart illustrating a method of operating a terminal according to an embodiment.
8 is a block diagram of a base station according to an embodiment.
9 is a block diagram of a terminal according to an embodiment.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. The same reference numerals in each drawing indicate the same members.

Various changes may be made to the embodiments described below. The embodiments described below are not intended to be limited to the embodiments, and should be understood to include all changes, equivalents, and substitutes thereto.

The terms used in the examples are used only to describe specific embodiments, and are not intended to limit the embodiments. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiments, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the embodiments, the detailed description thereof will be omitted.

1 is a diagram illustrating a 5G system having a non-stand alone (NSA) structure according to an exemplary embodiment. Referring to FIG. 1, a 5G system 100 having an NSA structure includes a user equipment (UE) 110, an LTE base station, an eNB 120, a 5G base station, a gNB 130, and an LTE core network, an EPC 140. It may include.

The number of user equipment (UE) 110 is singular or plural, and may include 4G terminal(s) and/or 5G terminal(s). Hereinafter, for convenience of description, the user terminal 110 will be briefly referred to as a'terminal'.

The NSA structure is a structure that uses 5G technology together with LTE technology. According to the NSA structure, the eNB 120 as an LTE base station and the gNB 130 as a 5G base station may be used together to provide 5G service to the terminal 110.

The eNB 120 is a base station used in an LTE system that supports interworking with the LTE Radio technology and the EPC 140.

The gNB 130 is a 5G base station, which is a next generation NodeB that supports interworking with 5G New radio (NR) technology and 5G core.

The terminal 110 communicates with the eNB 120 and/or the gNB 130 and may receive 4G service and/or 5G service.

Depending on the embodiment, the above-described eNB 120 and/or gNB 130 supports interworking with 5G New radio (NR) technology and 5G core, and at the same time, the EPC 140 as the core of the LTE system and the eNodeB as the base station ( 120) may be replaced with a new base station, en-gNB (not shown).

In the NSA structure, the terminal 110 uses not only the resources of the eNB 120 supporting LTE Radio technology, but also the resources of en-gNB supporting 5G NR technology while interworking with the eNB 120 and EPC 140. I can. In this way, a technology in which a terminal supporting one or more transmission and reception simultaneously uses resources controlled by one or more base stations may be referred to as'dual connectivity (DC)' or'dual carrier'. For 5G services that require a large capacity, better radio signals and free radio resources are required, and transmission speed and reliability can be increased by arranging 5G terminals in a more spare frequency band through dual connection.

The base station (for example, the eNB 120) according to an embodiment may perform load balancing by dividing the case where the terminal 110 is in an idle mode and a case in which the terminal 110 is in an active mode. .

"The terminal is in an idle mode" may mean that the terminal is in a state in which the terminal is switched from an active state to an idle state connected to the network or a state in which the corresponding terminal is in an idle mode. The'idle state' is a state in which a resource related to radio access among radio resources allocated from the eNB 120 and/or gNB 130 is released by the corresponding terminal, for example, "Radio Resource Control (RRC) Connection May be in the "Release" state.

In addition, "the terminal is in the active mode" may mean that the terminal is in a state in which the terminal is switched from an idle state to an active state connected to the network or that the corresponding terminal is in a state in which the active mode is maintained. 'Activation state' is a state in which the corresponding terminal is provided with LTE service or 5G service using radio resources allocated from the eNB 120 and/or gNB 130, for example, "Radio Resource Control (RRC) Connected "It can be a state. A method for the base station to perform load balancing will be described in detail with reference to FIGS. 4 to 5 below.

Higher quality radio signals and abundant radio resources are required for 5G services that require a large amount of speed. In one embodiment, the 5G terminal may receive data from two systems, a 4G system and a 5G system. In addition, in an embodiment, by arranging the 5G terminal in a more spare frequency band, it is possible to improve a transmission speed and improve transmission reliability.

2 is a flowchart illustrating a method of operating a base station according to an embodiment. Referring to FIG. 2, a base station according to an embodiment receives first messages including information indicating whether the corresponding terminal supports 5G service from a plurality of terminals including a 4G terminal and a 5G terminal (210). . The base station may be, for example, an eNB. Here, the '4G terminal' may be a terminal having a function supporting 4G service such as, for example, Long Term Evolution (LTE). In addition, the '5G terminal' can be used not only in the 3.5 GHz band, but also in the ultra high frequency range of 20 GHz or higher and the low frequency of the 800 MHz band, and may be a terminal having a function that supports 5G service. The plurality of terminals may be terminals included in a serving cell indicating an area in which a corresponding base station can provide a network service. A'serving cell' is a cell that provides UE and higher layer signaling (eg, Radio Resource Control (RRC) signaling) and may refer to one cell or multiple cells.

The base station may cover one serving cell or a plurality of serving cells. Here, the plurality of serving cells may be classified by a frequency supported by the base station and a sector area covered by the base station.

The first messages may be transmitted by a plurality of terminals in response to a message inquiring whether the terminal supports 5G service and a frequency band supported by the corresponding terminal, transmitted by the base station to each of the plurality of terminals. In this case, the message may be, for example, a "UE Capability Inquiry" message shown in FIG. 3 below, and the first message(s) may be, for example, a "UE Capability Information" message shown in FIG. 3 below. .

In addition to information indicating whether the corresponding terminal supports 5G service, the first messages may further include information on a frequency band supported by the corresponding terminal.

The base station selects a 5G terminal from among a plurality of terminals based on the first messages (220). The base station may select the corresponding terminal as a 5G terminal, for example, according to whether there is a first message including information indicating that the terminal supports 5G service among the first messages.

The base station determines the load for each serving frequency band for a plurality of terminals (230). The base station is, for example, based on at least one of the number of terminals in the active state among the plurality of terminals and the number of available resource blocks for the terminal in the active state, serving frequency bands for the plurality of terminals. Star load can be judged. Here, the number of terminals in the active state may correspond to the number of terminals in the "Radio Resource Control (RRC) Connected" state with the corresponding base station, for example. The available resource block may correspond to a unit of minimum transmission resource for transmitting available power information in an orthogonal frequency division multiplexing (OFDM) scheme in which a high-speed transmission signal is multiplexed with a plurality of orthogonal narrowband carriers. . The base station may determine the load of the current frequency band by, for example, checking the number of terminals in the active state and the buffer size to be transmitted to the terminal when resource allocation.

The base station adjusts parameters for load balancing of each of the 5G terminal and the 4G terminal based on the load for each serving frequency band (240). Here, the parameter may include priority for each serving frequency band. The base station may adjust the priority for each serving frequency band set for each of the 5G terminal and the 4G terminal, for example, based on the load for each serving frequency band.

In step 240, the base station may set the first frequency band having the least load among the serving frequency bands as the first priority for the 5G terminal based on the load for each serving frequency band. The base station may set the first frequency band as the first priority for the 5G terminal, so that the 5G terminal can receive a service prior to the 4G terminal.

In addition, based on the load for each serving frequency band, the base station selects the second frequency band with the lowest load after the first frequency band among the remaining frequency bands except the first frequency band with the least load among the serving frequency bands. It can be set as the first priority for the terminal. Depending on the embodiment, the base station may set a priority for a frequency band or may set a priority for a specific frequency.

The base station may adjust a parameter for load balancing to be transmitted to a 5G terminal or a 4G terminal that switches from an active state to an idle state among a plurality of terminals based on the load for each serving frequency band.

The base station transmits a second message containing the parameters adjusted in step 240 (250). For example, the base station may transmit a second message to a terminal switching from an active state to an idle state among a plurality of terminals. According to an embodiment, the second message includes an RRC Connection Release message for switching the state of the corresponding terminal from the active state to the idle state, and the RRC Connection Release message may include a parameter adjusted for load balancing for each serving frequency band. have.

3 is a diagram illustrating an initial access call flow of a 5G terminal according to an embodiment. Referring to FIG. 3, an initial terminal (UE) 301 performed by an eNB 303, a gNB 305, a Serving Gate Way (S-GW) 307, and a Mobility Management Entity (MME) 309 A process in which a base station (eg, eNB 303) selects a 5G terminal in an access call flow is shown. Depending on the embodiment, the gNB 305 may be en-gNB.

The eNB 303 may serve as a master node. The eNB 303 may relay the transmission and reception of NAS control messages between the MME 309 and the UE 301 by creating an S1-MME control connection with the control entity MME 309 of the EPC, which is the core of the LTE system. In addition, the eNB 303 may create an RRC connection with the terminal 301 using LTE Radio technology and manage an RRC state based on the RRC connection.

The gNB 305 may serve as a secondary node. The gNB 305 may be involved in an additional data connection for transmitting and receiving high-capacity data without being involved in the control connection associated with the EPC and relaying NAS messages.

The MME 309 is a node for managing the mobility of the UE 301, and transmits verification information by executing a user authentication function, and manages the location of the UE 301 and security elements in the idle mode. Can be managed. The MME 309 checks whether the terminal (UE) 301 supports dual connectivity (DC) based on the UE capability information transmitted by the terminal (UE) 301, and checks whether the terminal has subscribed to 5G. In addition, the MME 309 may transmit to the eNB 303 serving as a master node that the terminal 301 is allowed to use a dual connection (DC) including a new radio (NR).

The S-GW (Serving Gate Way) 307 may perform an anchoring function for terminal movement between the eNB 303 and the eNB 303 or between the 3GPP network and the E-UTRAN.

In FIG. 3, a terminal 301 using a dual connection (DC) connects to the LTE system, and accordingly, the terminal may be in an RRC-connected state.

The eNB 303 may determine to use a dual connection (DC) after confirming that the terminal 301 allows the use of a dual connection including a new radio (NR) according to the information received from the MME 309. When determining the use of dual connectivity, the eNB 303 may allow the UE 301 to measure the new radio (NR) access performance of the gNB 305, which will serve as a secondary node, and report it as a Measurement Report.

The eNB 303, which has decided to use the dual connection, selects bearers to be moved to the gNB 305 to use New radio (NR), and then assigns New radio (NR) resources for the bearers to the gNB 305 ) Can be requested with SgNB Addition Request.

The gNB 305 receiving a request to allocate NR radio (NR) resources for bearers moved from the eNB 303 to the gNB 305 may allocate NR radio resources.

The gNB 305 may allocate terminating resources for receiving data from the eNB 303 or the S-GW 307 according to the data path to be used among the eNB 303 and the S-GW 307. The result of resource allocation for bearers may be known to the eNB 303 as SgNB Addition Request Acknowledge.

Upon receiving the resource information for bearers to be moved from the gNB 305, the eNB 303 may transmit the NR radio resource configuration information to the terminal 301 using a "RRC Connection Reconfiguration" message. The NR radio resource configuration information may include, for example, information on RACH configuration, C-RNTI, and radio bearer.

As the gNB 305 receives the "RRC Connection Reconfiguration Complete" message from the terminal 301, the gNB 305 may confirm that the delivery of NR radio resource configuration information is complete. The eNB 303 may transmit a "SgNB Reconfiguration Complete" message to the gNB 305 to notify that delivery of NR radio resource configuration information has been completed.

Thereafter, the terminal 301 may access the gNB 303 based on the configuration information received in the RRC message to perform movement of the radio bearer of the bearer.

As described above, the start of dual connection is always possible only when the terminal 301 is in an RRC connected state with the eNB 303, which is a master node. If the terminal 301 is in the RRC idle state, it may first switch to the RRC connected state and then determine whether to use the dual connection according to the determination of the eNB 303.

In one embodiment, by adding a procedure for distinguishing 5G terminals at the base station through steps 310 and 320, different frequency priorities are set for the 4G terminal and the 5G terminal, so that the 5G terminal is given priority in a specific frequency band. You can have the service provided.

Step 310 and step 320 are the eNB 303 to the UE 301, the frequency band supported by the UE 301 and whether the UE 301 supports 5G service, that is, support of 5G service. It requests whether or not it is possible, and corresponds to a process in which the terminal responds. For example, in the case of a 5G terminal, the terminal 301 carries 5G support information in a "UE Capability Information" message transmitted to the eNB 303 in step 320 and transmits the information, and the eNB 303 transmits this information. As a basis, it is possible to select whether the terminal 310 is a 5G terminal or a 4G terminal.

4 is a diagram illustrating a method for a base station to perform load balancing for a 5G terminal according to an embodiment. 4, a base station 410 and a 5G terminal 430 are shown.

The base station according to an embodiment may perform load balancing in each of the idle mode and the active mode. A method for the base station 410 to perform load balancing of the 5G terminal 430 in the idle mode is as follows.

The base station 410 may transmit a "RRC Connection Release" message to the 5G terminal 430 when the 5G terminal 430 is switched from a connected state to an idle state to operate in an idle mode. In this case, the base station 410 may set a priority for each frequency in the "RRC Connection Release" message and transmit it to the 5G terminal 430. The 5G terminal 430 may receive a service in the corresponding frequency band by performing re-selection in the corresponding frequency band according to this priority.

For example, as shown in FIG. 4, the base station 410 may determine a load for each serving frequency band. In this case, it is assumed that the load of the frequency band B among the frequency bands A, B, and C is the smallest, and the load of the remaining frequency band A and the frequency band C is equally high. The base station 410 sets the highest priority (e.g., at 100%) to the frequency band B with the lowest load among frequency bands A, B, and C, and the priority of the remaining frequency bands is low (for example, , 0%). The base station 410 can transmit to the 5G terminal 430 by setting the priority of A, B, and C to 0%, 100%, and 0%, respectively, in the "RRC Connection Release" message, based on the load for each serving frequency band. have. The 5G terminal 430 may select a frequency band B having the least load among the frequency bands as its serving frequency band.

According to an embodiment, the base station 410 may determine a load for each frequency, not a frequency band, and set the highest priority to a frequency having the lowest load, and transmit it to the 5G terminal 430. In this case, the 5G terminal 430 may select a frequency having the lowest load as its serving frequency.

In addition, a method in which the base station 410 performs load balancing of the 5G terminal 430 in the active mode is as follows.

The base station 410 may compare the load of the frequency band serving the 5G terminal 430 among the serving frequency bands with a preset reference value. The base station 410 may distribute the load of a new 5G terminal to access the corresponding frequency band based on the comparison result.

If the load of the corresponding frequency band is higher than a certain level, the base station 410 rejects the access attempt of a terminal (new 5G terminal) that attempts to access a new terminal, or loads a new 5G terminal into another frequency band with less load (e.g. For example, it is possible to forcibly transition to a frequency band with the lowest load after the corresponding frequency band). At this time, the base station 410 forcibly sets the 5G terminal to not perform a handover for a certain period of time, so that it cannot move to the frequency band where the overload occurs, that is, the frequency band where the access attempt is rejected. can do. According to an embodiment, the base station 410 may handover a new 5G terminal to a cell other than a cell corresponding to a corresponding frequency band.

For example, if a state in which the load of all serving frequency bands is more than the reference value during a function operation of the base station 410 continues for a certain period of time, the base station 410 holds the function operation, and the load of the serving frequency bands is When the state below the reference value is satisfied for a certain time, the operation may be restarted.

FIG. 5 is a diagram for explaining a method for a base station to adjust a parameter for load balancing of a 4G terminal and a 5G terminal according to an embodiment. Referring to FIG. 5, a 5G terminal 510 and a 4G terminal 530 served from one base station are shown.

The base station may determine the load for each serving frequency band for a plurality of terminals in its serving cell. The base station may determine the load for each serving frequency band by monitoring, for example, the number of terminals in the active state included in its serving cell and the number of available resource blocks for the terminals in the active state for 1 second.

In this case, assume that the load for each serving frequency band has the highest frequency A, the second highest frequency C, and the lowest frequency B. The base station may adjust a parameter for load balancing of the 5G terminal 510 or the 4G terminal 530 switched from an active state to an idle state among a plurality of terminals in a cell based on the load for each serving frequency band.

For example, assume that the 5G terminal 510 transitions from an active state to an idle state.

In this case, the base station sets the highest priority (100%) to the frequency B with the lowest load among frequencies A, B, and C, and sets a lower priority (0%) to the remaining frequencies A and C. 510), so that the 5G terminal 510 may reselect the frequency B having the lowest load as its serving frequency. This process can be repeated at every cycle set by the operator.

In addition, the base station has the highest priority (70%) for the 4G terminal 530 with the frequency C having the second lowest load after the frequency B among the remaining frequencies A and C, excluding the frequency B having the least load among the serving frequency bands. ), and a lower priority (30%) can be set for the remaining frequency A. The 4G terminal 530 may select frequency B as its serving frequency.

6 is a flowchart illustrating a method of operating a base station according to another embodiment. Referring to FIG. 6, a base station according to an embodiment may transmit a message to each of a plurality of terminals to inquire about a frequency band supported by the corresponding terminal and whether the corresponding terminal supports 5G service (610). In this case, the plurality of terminals may include a 4G terminal and/or a 5G terminal.

In response to the message transmitted in step 610, the base station may receive first messages including information indicating whether the 5G service is supported from the plurality of terminals (620).

The base station selects a 5G terminal from among a plurality of terminals based on the first messages (630).

The base station determines the load for each serving frequency band for a plurality of terminals (640).

The base station adjusts a parameter for load balancing of each of the 5G terminal and the 4G terminal based on the load for each serving frequency band (650).

The base station transmits a second message including the parameters adjusted in step 650 (660).

The base station may compare the load of the first frequency band serving the 5G terminal among the serving frequency bands with a preset reference value (670 ).

The base station may distribute the load of the new 5G terminal to access the first frequency band based on the comparison result of step 670 (680). As a result of the comparison in step 670, if the load of the first frequency band serving the 5G terminal is equal to or greater than a preset reference value, the base station may distribute the load of the new 5G terminal. The method for the base station to distribute the load of the new 5G terminal is as follows.

The base station may reject, for example, an attempt to access a new 5G terminal for the first frequency band. The base station may allocate a second frequency band having a lower load after the first frequency band to the new 5G terminal. Alternatively, the base station may handover the new 5G terminal to the remaining cells except for the first cell corresponding to the first frequency band.

7 is a flowchart illustrating a method of operating a terminal according to an embodiment. Referring to FIG. 7, a terminal according to an embodiment receives a second message including an adjusted parameter for load balancing from a base station (710). Here, the parameter may include priority for each serving frequency band.

For example, if the terminal is a 5G terminal, the parameter may be that the first frequency band having the least load among the serving frequency bands is set as the first priority for the 5G terminal based on the load for each serving frequency band of the base station. have.

Or, for example, if the terminal is a 4G terminal, the parameter is a second frequency band having the second lowest load after the first frequency band among the remaining frequency bands except for the first frequency band having the least load among the serving frequency bands of the base station. The frequency band may be set as the first priority for the 4G terminal.

The terminal may receive a message from the base station for inquiring about a frequency band supported by the terminal and whether the terminal supports 5G service. In response to the message, the terminal may transmit a first message including information indicating whether the terminal supports 5G service to the base station. In step 710, the second message may be received in response to the first message transmitted by the terminal to the base station.

The terminal determines a frequency band for communication with the base station based on the adjusted parameter (720).

The terminal receives a service from the base station through the frequency band determined in step 720 (730).

8 is a block diagram of a base station according to an embodiment. Referring to FIG. 8, a base station 800 according to an embodiment includes a processor 810 and a communication interface 830. The base station 800 may further include a memory 850. The processor 810, the communication interface 830, and the memory 850 may communicate with each other through a communication bus.

The processor 810 selects a 5G terminal from among a plurality of terminals based on the first messages received through the communication interface 830. In this case, the first messages are transmitted from a plurality of terminals including a 4G terminal and a 5G terminal, and include information indicating whether the corresponding terminal supports 5G service.

The processor 810 determines the load for each serving frequency band for a plurality of terminals. The processor 810 adjusts parameters for load balancing of each 5G terminal and 4G terminal based on the load for each serving frequency band. The processor 810 may adjust the priority for each serving frequency band set for each of the 5G terminal and the 4G terminal, for example, based on the load for each serving frequency band.

The communication interface 830 receives first messages. The communication interface 830 transmits a second message including a parameter adjusted by the processor 810.

The memory 850 may store the priority for each serving frequency band set for each of the 5G terminal and the 4G terminal adjusted by the processor 810. The memory 850 may store a load for each serving frequency band. The memory 850 may store first messages received through the communication interface 830 and/or a second message transmitted through the communication interface 830.

In addition, the processor 810 may perform at least one method or an algorithm corresponding to at least one method described above with reference to FIGS. 1 to 7. The processor 810 may be a data processing device implemented in hardware having a circuit having a physical structure for executing desired operations. For example, desired operations may include code or instructions included in a program. For example, a data processing device implemented in hardware is a microprocessor, a central processing unit, a processor core, a multi-core processor, and a multiprocessor. , Application-Specific Integrated Circuit (ASIC), and Field Programmable Gate Array (FPGA).

The processor 810 may execute a program and control the base station 800. Program codes executed by the processor 810 may be stored in the memory 850.

The memory 850 may store various pieces of information generated during processing in the processor 810 described above. In addition, the memory 850 may store various types of data and programs. The memory 850 may include a volatile memory or a nonvolatile memory. The memory 850 may be provided with a mass storage medium such as a hard disk to store various types of data.

9 is a block diagram of a terminal according to an embodiment. Referring to FIG. 9, a terminal 900 according to an embodiment is shown. The terminal 900 includes a processor 910 and a communication interface 930. The terminal 900 may further include a memory 950. The processor 910, the communication interface 930, and the memory 950 may communicate with each other through a communication bus 905.

The processor 910 determines a frequency band for communication with the base station based on the adjusted parameter for load balancing. The processor 910 receives a service from a base station through a frequency band.

The communication interface 930 receives a second message including adjusted parameters for load balancing from the base station.

The memory 950 may store the frequency band determined by the processor 910. Also, the memory 950 may store the second message.

Also, the processor 910 may perform at least one method or an algorithm corresponding to at least one method described above with reference to FIGS. 1 to 9. The processor 910 may be a data processing device implemented in hardware having a circuit having a physical structure for executing desired operations. For example, desired operations may include code or instructions included in a program. For example, a data processing device implemented in hardware is a microprocessor, a central processing unit, a processor core, a multi-core processor, and a multiprocessor. , Application-Specific Integrated Circuit (ASIC), and Field Programmable Gate Array (FPGA).

The processor 910 may execute a program and control a terminal. Program code executed by the processor 910 may be stored in the memory 950.

The memory 950 may store various pieces of information generated during processing in the processor 910 described above. In addition, the memory 950 may store various types of data and programs. The memory 950 may include a volatile memory or a nonvolatile memory. The memory 950 may include a mass storage medium such as a hard disk to store various types of data.

The method according to an embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded in the medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of the program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The above-described hardware device may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations from these descriptions are those of ordinary skill in the field to which the present invention belongs. This is possible.

Therefore, the scope of the present invention is limited to the described embodiments and should not be defined, and should be defined by the claims and equivalents as well as the claims to be described later.

100: 5G system
110: terminal
120: eNB
130: gNB
140: EPC

Claims (20)

Receiving first messages including information indicating whether the corresponding terminal supports 5G service from a plurality of terminals including a 4G terminal and a 5G terminal;
Selecting the 5G terminal from among the plurality of terminals based on the first messages;
Determining a load for each serving frequency band for the plurality of terminals;
Adjusting a parameter for load balancing of each of the 5G terminal and the 4G terminal based on the load for each serving frequency band; And
Transmitting a second message including the adjusted parameter
Including a method of operation of the base station. The method of claim 1,
Adjusting the parameter
Adjusting the priority for each serving frequency band set for each of the 5G terminal and the 4G terminal based on the load for each serving frequency band
Including a method of operation of the base station. The method of claim 2,
The step of adjusting the priority for each serving frequency band
Setting a first frequency band having the least load among the serving frequency bands as a first priority for the 5G terminal based on the load for each serving frequency band
Including a method of operation of the base station. The method of claim 2,
The step of adjusting the priority for each serving frequency band
Based on the load for each serving frequency band, a second frequency band having a lower load after the first frequency band among the remaining frequency bands excluding the first frequency band having the least load among the serving frequency bands is set to the 4G. Setting the first priority for the terminal
Including a method of operation of the base station. The method of claim 1,
Adjusting the parameter
Adjusting a parameter for load balancing of a 5G terminal or a 4G terminal switched from an active state to an idle state among the plurality of terminals based on the load for each serving frequency band
Including a method of operation of the base station. The method of claim 1,
The step of selecting the 5G terminal
Selecting the corresponding terminal as the 5G terminal according to whether there is a first message including information indicating that the corresponding terminal supports the 5G service among the first messages
Including a method of operation of the base station. The method of claim 1,
The step of determining the load for each serving frequency band
Based on at least one of the number of terminals in the active state among the plurality of terminals and the number of available resource blocks for the terminal in the active state, the load for each serving frequency band for the plurality of terminals is calculated. Judging step
Including a method of operation of the base station. The method of claim 1,
Transmitting, to each of the plurality of terminals, a message inquiring whether a frequency band supported by the corresponding terminal and whether the corresponding terminal supports 5G service
Including more,
Receiving the first messages
Receiving the first messages from the plurality of terminals in response to the message
Including a method of operation of the base station. The method of claim 1,
Comparing a load of a first frequency band serving the 5G terminal among the serving frequency bands with a preset reference value; And
Balancing the load of a new 5G terminal to access the first frequency band based on the comparison result
Further comprising a method of operation of the base station. The method of claim 9,
The step of balancing the load of the 5G terminal
Rejecting an attempt to access the new 5G terminal for the first frequency band;
Allocating a second frequency band having a lower load than the first frequency band to the new 5G terminal; And
Handover of the new 5G terminal to a cell other than the first cell corresponding to the first frequency band
Including at least one of, the operation method of the base station. The method of claim 1,
Transmitting the second message
Transmitting the second message to a terminal switching from an active state to an idle state among the plurality of terminals
Including a method of operation of the base station. The method of claim 1,
The first messages
The operation method of the base station further comprising information on a frequency band supported by the corresponding terminal. Receiving a second message including an adjusted parameter for load balancing from a base station;
Determining a frequency band for communication with the base station based on the adjusted parameter; And
Receiving a service from the base station through the frequency band
Containing, the operating method of the terminal. The method of claim 13,
Receiving, from the base station, a message inquiring whether a frequency band supported by the terminal and whether the terminal supports 5G service; And
In response to the message, transmitting a first message including information indicating whether the terminal supports 5G service
Containing, the operating method of the terminal. The method of claim 13,
If the terminal is a 5G terminal, the parameter is
The first frequency band having the least load among serving frequency bands of the base station is set as a first priority for the 5G terminal. The method of claim 13,
When the terminal is a 4G terminal, the parameter is
Among the remaining frequency bands except for the first frequency band having the least load among the serving frequency bands of the base station, the second frequency band having the second lowest load after the first frequency band is the first priority for the 4G terminal. It is set, the operating method of the terminal. A computer program stored in a computer-readable recording medium for executing the method of any one of claims 1 to 16 in combination with hardware. Based on first messages including information indicating whether the corresponding terminal supports 5G service from a plurality of terminals including a 4G terminal and a 5G terminal, the 5G terminal is selected from among the plurality of terminals, and the plurality of A processor configured to determine a load for each serving frequency band for the UEs and adjust a parameter for load balancing of each of the 5G terminal and the 4G terminal based on the load for each serving frequency band; And
Communication interface for receiving the first messages and transmitting a second message including the adjusted parameter
Including a base station. The method of claim 18,
The processor is
Adjusting the priority for each serving frequency band set for each of the 5G terminal and the 4G terminal based on the load for each serving frequency band,
Base station. A communication interface for receiving a second message including an adjusted parameter for load balancing from a base station; And
A processor that determines a frequency band for communication with the base station based on the adjusted parameter, and receives a service from the base station through the frequency band
Containing, the terminal.

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