KR102592663B1 - Method for dividing traffic and main base station performin the method - Google Patents

Abstract

A method for dividing traffic and a main base station performing the method are provided. The main base station establishes a link with the sub base station to divide the traffic requested by the user terminal, and the main base station divides a portion of the traffic requested by the user terminal into the sub base stations in consideration of the load of the sub base station.

Description

Traffic division method and main base station performing the method {METHOD FOR DIVIDING TRAFFIC AND MAIN BASE STATION PERFORMIN THE METHOD}

The following embodiments relate to a technology for dividing traffic requested by a user terminal, and more specifically, to a technology for dividing traffic into a plurality of base stations.

Wireless communication systems are widely deployed to provide various types of communication content such as voice content, data content, etc. Typical wireless communication systems may be multi-access systems that can support communication with multiple users by sharing available system resources (eg, bandwidth, transmit power, etc.). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, etc. can do. Additionally, systems can support specifications such as 3rd Generation Partnership Project (3GPP), 3GPP Long Term Evolution (LTE), Ultra Mobile Broadband (UMB), or multi-carrier wireless specifications such as Optimized Evolution Data (EV-DO). , one or more revisions of these, etc.

One embodiment may provide a method for dividing traffic and a main base station that performs the method.

One embodiment may provide a method of dividing a portion of traffic requested by a user terminal into sub-base stations in consideration of the load of the sub-base station, and a main base station that performs the method.

According to one aspect, a method of dividing traffic between a main base station and a sub base station includes establishing a link between the main base station and the sub base station by the main base station, the main base station receiving information about the status of the sub base station from the sub base station. Receiving information, the main base station determining whether to divide some of the traffic of the user terminal requested to the main base station to the sub base station based on the information, and the main base station When it is determined to divide the traffic into the sub-base stations, transferring the portion of traffic to the sub-base stations.

The information may include at least one of the value of Hardware Load Indicator and Radio Resource Status included in the RESOURCE STATUS UPDATE message transmitted from the sub base station to the main base station.

The step of determining whether to divide some of the traffic into the sub-base stations is performed when the value of the Hardware Load Indicator is High Load or Over Load and the PRB usage rate indicated by the value of Radio Resource Status is greater than or equal to a preset first threshold value. , It may include the step of determining not to divide the portion of traffic into the sub-base stations.

The information may be displayed in a sparse extension defined in the DL DATA DELIVERY STATUS message transmitted from the sub base station to the main base station.

The information may include at least one of the CPU load value, RRC Load value, and PRB load value included in the sparse extension.

The information may be a ratio of the CPU load value, RRC Load value, and PRB load value.

The step of determining whether to divide the portion of traffic into the sub-base stations includes determining not to divide the portion of traffic into the sub-base stations when the value of the CPU load is greater than or equal to a preset second threshold. It can be included.

The step of determining whether to divide the portion of traffic into the sub-base stations includes, when the value of the RRC load is greater than or equal to a preset third threshold and the value of the PRB load is greater than or equal to a preset fourth threshold, the portion of traffic is divided into sub-base stations. It may include determining not to divide the traffic of to the sub base station.

The step of determining whether to divide some of the traffic into the sub base stations includes determining whether the main base station divides the part of traffic into the sub base stations based on the distance between the sub base station and the user terminal. may include.

The step of determining whether to divide some of the traffic into the sub base stations may include the step of determining whether the main base station divides the part of traffic into the sub base stations based on the moving direction of the user terminal. You can.

The main base station, which performs a method of dividing traffic between the main base station and the sub base station, includes a memory in which a program for dividing traffic is recorded, and a processor that executes the program, and the program includes the main base station and the sub base station. Establishing a link between base stations, receiving information about the status of the sub-base station from the sub-base station, and dividing some of the traffic of the user terminal requested to the main base station to the sub-base station based on the information. A step of determining whether to do so, and if it is determined to divide the part of traffic into the sub base station, a step of forwarding the part of traffic to the sub base station.

The information may include at least one of the value of Hardware Load Indicator and Radio Resource Status included in the RESOURCE STATUS UPDATE message transmitted from the sub base station to the main base station.

The step of determining whether to divide some of the traffic into the sub base stations is performed when the value of the Hardware Load Indicator is High Load or Over Load and the PRB usage rate indicated by the value of Radio Resource Status is greater than or equal to a preset first threshold value. , It may include the step of determining not to divide the portion of traffic into the sub-base stations.

The information may be displayed in a sparse extension defined in the DL DATA DELIVERY STATUS message transmitted from the sub base station to the main base station.

The information may include at least one of the CPU load value, RRC Load value, and PRB load value included in the sparse extension.

The step of determining whether to divide some of the traffic into the sub base stations includes determining whether the main base station divides the part of traffic into the sub base stations based on the distance between the sub base station and the user terminal. may include.

The step of determining whether to divide some of the traffic into the sub base stations may include the step of determining whether the main base station divides the part of traffic into the sub base stations based on the moving direction of the user terminal. You can.

A method for dividing traffic and a main base station performing the method are provided.

A method of dividing a portion of traffic requested by a user terminal into sub base stations in consideration of the load of the sub base station and a main base station performing the method are provided.

Figure 1 shows a main base station and a sub base station providing traffic to a user terminal according to an example.
Figure 2 is a wireless protocol architecture for dual connectivity according to an example.
Figure 3 is a configuration diagram of a main base station according to an embodiment.
Figure 4 is a flowchart of a traffic splitting method using dual connectivity according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, various changes can be made to the embodiments, so the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents, or substitutes for the embodiments are included in the scope of rights.

The terms used in the examples are for descriptive purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the embodiments belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

In addition, when describing with reference to the accompanying drawings, identical components will be assigned the same reference numerals regardless of the reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiments, if it is determined that detailed descriptions of related known technologies may unnecessarily obscure the gist of the embodiments, the detailed descriptions are omitted.

Figure 1 shows a main base station and a sub base station providing traffic to a user terminal according to an example.

In order to provide a high quality communication environment to the user terminal 130, a plurality of base stations 110 and 120 may be associated with the user terminal 130. A plurality of base stations 110 and 120 may establish dual connectivity (DC) with the user terminal 130. When data aggregation is used for data transmission, a plurality of base stations 110 and 120 may be associated with the user terminal 130 to transmit data to the user terminal 130.

According to one aspect, the user terminal 130 requests traffic from the main base station 110, and the main base station 110 may transmit a portion of the requested traffic to the sub base station 120. The sub base station 120 delivers some of the requested traffic to the user terminal 130, and the user terminal 130 can merge the traffic delivered from the main base station 110 and the traffic delivered from the sub base station 120. there is.

When the sub base station 120 is involved in traffic transmission, the efficiency of traffic transmission can be improved. However, when traffic is divided from the main base station 110 even though the sub base station 120 cannot quickly process the requested traffic, the traffic is not processed quickly. Accordingly, a method for appropriately dividing traffic is required.

Figure 2 is a wireless protocol architecture for dual connectivity according to an example.

In dual connectivity (DC), three bearers, MCG bearer, SCG bearer, and split bearer, are defined, and traffic can be distributed depending on how the bearers are distributed and set.

Figure 3 is a configuration diagram of a main base station according to an embodiment.

The main base station 300 includes a communication unit 310, a processor 320, and a memory 330. The main base station 300 may be a base station that provides wireless communication services. For example, the main base station 300 may be a master base station (MeNB) that provides cellular communication services.

The communication unit 310 is connected to the processor 320 and the memory 330 to transmit and receive data. The communication unit 310 can be connected to other external devices to transmit and receive data.

The communication unit 310 may be implemented as a circuitry within the main base station 300. For example, the communication unit 310 may include an internal bus and an external bus. As another example, the communication unit 310 may be an element that connects the main base station 300 and an external device. The communication unit 310 may be an interface. The communication unit 310 may receive data from an external device and transmit the data to the processor 320 and the memory 330.

The processor 220 processes data received by the communication unit 310 and data stored in the memory 330. A “processor” may be a data processing device implemented in hardware that has a circuit with a physical structure for executing desired operations. For example, the intended operations may include code or instructions included in the program. For example, data processing devices implemented in hardware include microprocessors, central processing units, processor cores, multi-core processors, and multiprocessors. , ASIC (Application-Specific Integrated Circuit), and FPGA (Field Programmable Gate Array).

Processor 320 executes computer-readable code (e.g., software) stored in memory (e.g., memory 330) and instructions triggered by processor 320.

The memory 330 stores data received by the communication unit 310 and data processed by the processor 320. For example, memory 330 can store programs. The stored program may be a set of syntax that is coded to divide traffic and can be executed by the processor 320.

According to one aspect, the memory 330 may include one or more volatile memory, non-volatile memory, random access memory (RAM), flash memory, a hard disk drive, and an optical disk drive.

The memory 330 stores a set of instructions (eg, software) that operates the main base station 300. A set of instructions for operating the main base station 300 is executed by the processor 320.

The communication unit 310, processor 320, and memory 330 are described in detail below with reference to FIG. 4.

Figure 4 is a flowchart of a traffic splitting method using dual connectivity according to an embodiment.

In step 410, the main base station 300 establishes a link between the main base station 300 and the sub base stations. For example, the established link may be an X2 link or an Xn link. The X2 link or Xn link may follow the specifications of 3GPP.

In step 420, the main base station 300 receives information about the status of the sub base station from the sub base station.

According to one aspect, the information includes at least one of the value of Hardware Load Indicator and the value of Radio Resource Status included in the RESOURCE STATUS UPDATE message transmitted from the sub base station to the main base station 300. For example, the sub base station may periodically transmit a RESOURCE STATUS UPDATE message to the main base station 300. As another example, when the sub base station receives a message transmission request from the main base station 300, the sub base station may transmit a RESOURCE STATUS UPDATE message in response to the request.

The information in the RESOURCE STATUS UPDATE message is defined as in [Table 1] below.

[Table 1]

The information in the Hardware Load Indicator in the RESOURCE STATUS UPDATE message is defined as shown in [Table 2] below.

[Table 2]

Information in Radio Resource Status in the RESOURCE STATUS UPDATE message is defined as shown in [Table 3] below.

[Table 3]

Load indicator information within the Hardware Load Indicator is defined as in [Table 4] below.

[Table 4]

According to another aspect, the information includes at least one of the CPU load value, RRC Load value, and PRB load value included in the DL DATA DELIVERY STATUS message transmitted from the sub base station to the main base station 300. More specifically, the information may be a ratio of the value of CPU load, the value of RRC Load, and the value of PRB load. The information in the DL DATA DELIVERY STATUS message is defined as shown in [Table 5] below. The sub base station may be preset to transmit the current status of the sub base station to the main base station 110 through a DL DATA DELIVERY STATUS message (PDU type 1).

The information in the DL DATA DELIVERY STATUS message is defined as shown in [Table 5] below.

[Table 5]

The ratio of the CPU load value, RRC Load value, and PRB load value can be displayed in the Spare extension in the DL DATA DELIVERY STATUS message. The value of CPU load, RRC Load, and PRB load may be private information. Spare extension may be an extra field that is not predefined in the system specifications and is designated to be used in the future for various modifications of the system. That is, depending on the embodiment, the main base station 300 and the sub base station may predefine the spare extension in the DL DATA DELIVERY STATUS message to indicate the ratio of the CPU load value, RRC Load value, and PRB load value. .

In step 430, the main base station 300 determines whether to divide some of the traffic of the user terminal requested to the main base station 300 into sub base stations based on the received information.

According to one aspect, when the main base station 300 receives the RESOURCE STATUS UPDATE message, the main base station 300 determines that the value of the Hardware Load Indicator is High Load or Over Load, and the PRB usage rate indicated by the value of Radio Resource Status is set in advance. If it is more than the set first threshold, it may be decided not to divide some traffic into sub-base stations. For example, the first threshold may be 70%.

According to another aspect, when receiving the DL DATA DELIVERY STATUS message transmitted by the main base station 300, if the value of the CPU load is greater than or equal to a preset second threshold, the main base station 300 sends some traffic to the sub base station. You can decide not to split. The second threshold may be 70%. As another example, the main base station 300 may determine not to divide some traffic into sub base stations when the value of the RRC load is greater than or equal to a preset third threshold and the value of PRB load is greater than or equal to a preset fourth threshold. there is. The third and fourth threshold values may be 70%.

According to another aspect, the main base station 300 may determine whether to divide some traffic into sub base stations based on the distance between the sub base stations and the user terminal. For example, if the distance between the sub-base station and the user terminal is too long, the quality of traffic transmitted by the sub-base station may be low, so the main base station 300 may decide not to divide some traffic into the sub-base stations.

According to another aspect, the main base station 300 may determine whether to divide some traffic into sub base stations based on the direction of movement of the user terminal. For example, if the user terminal is moving in a direction away from the sub base station, it is difficult for the sub base station to establish a connection with the user terminal, or even if the connection is established, there is a high possibility that the connection will be terminated, so the main base station 300 It may be decided not to divide some traffic into sub-base stations.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., singly or in combination. Program instructions recorded on the medium may be specially designed and configured for the embodiment or may be known and available to those skilled in the art of 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. -Includes optical media (magneto-optical media) and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Software may include a computer program, code, instructions, or a combination of one or more of these, which may configure a processing unit to operate as desired, or may be processed independently or collectively. You can command the device. Software and/or data may be used on any type of machine, component, physical device, virtual equipment, computer storage medium or device to be interpreted by or to provide instructions or data to a processing device. , or may be permanently or temporarily embodied in a transmitted signal wave. Software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

Although the embodiments have been described with limited drawings as described above, those skilled in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent.

Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the following claims.

300: main base station
310: Department of Communications
320: processor
330: memory

Claims (18)

In a method of dividing traffic between a main base station and a sub base station,
Establishing, by the main base station, a link between the main base station and the sub base station;
The main base station receiving information about the status of the sub base station from the sub base station;
determining, by the main base station, whether to divide some of the traffic of the user terminal requested to the main base station into the sub base stations based on the information; and
When the main base station determines to divide the part of traffic into the sub base station, transferring the part of traffic to the sub base station,
The above information is,
Containing the ratio of the value of CPU load, RRC Load, and PRB load included in the Sparse extension field in the DL DATA DELIVERY STATUS message transmitted from the sub base station to the main base station,
How to split traffic.
According to paragraph 1,
The above information is,
Containing at least one of the value of Hardware Load Indicator and the value of Radio Resource Status included in the RESOURCE STATUS UPDATE message transmitted from the sub base station to the main base station,
How to split traffic.
According to paragraph 2,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
If the value of the Hardware Load Indicator is High Load or Over Load and the PRB usage rate indicated by the value of Radio Resource Status is greater than or equal to a preset first threshold, determining not to divide the portion of traffic into the sub base stations.
Including,
How to split traffic.
delete delete delete According to paragraph 1,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
If the value of the CPU load is greater than or equal to a preset second threshold, determining not to divide the portion of traffic into the sub base stations.
Including,
How to split traffic.
According to paragraph 1,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
When the value of the RRC Load is greater than or equal to a preset third threshold and the value of PRB Load is greater than or equal to a preset fourth threshold, determining not to divide the portion of traffic into the sub base stations.
Including,
How to split traffic.
According to paragraph 1,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
Determining whether the main base station divides the portion of traffic into the sub base stations based on the distance between the sub base station and the user terminal.
Including,
How to split traffic.
According to paragraph 1,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
Determining whether the main base station divides the portion of traffic into the sub base stations based on the direction of movement of the user terminal.
Including,
How to split traffic.
A computer-readable recording medium containing a program for performing the method of any one of claims 1 to 3 and 7 to 10,
In the main base station, which performs a method of dividing traffic between the main base station and the sub base station,
Memory in which programs for splitting traffic are written; and
Processor that executes the above program
Including,
The above program is,
establishing a link between the main base station and the sub base station;
Receiving information about the status of the sub-base station from the sub-base station;
Based on the information, determining whether to divide some of the traffic of the user terminal requested to the main base station to the sub base station; and
When it is determined to divide the part of traffic into the sub base station, performing a step of forwarding the part of traffic to the sub base station,
The above information is,
Containing the ratio of the value of CPU load, RRC Load, and PRB load included in the Sparse extension field in the DL DATA DELIVERY STATUS message transmitted from the sub base station to the main base station,
Main base station.
According to clause 12,
The above information is,
Containing at least one of the value of Hardware Load Indicator and the value of Radio Resource Status included in the RESOURCE STATUS UPDATE message transmitted from the sub base station to the main base station,
Main base station.
According to clause 13,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
If the value of the Hardware Load Indicator is High Load or Over Load and the PRB usage rate indicated by the value of Radio Resource Status is greater than or equal to a preset first threshold, determining not to divide the portion of traffic into the sub base stations.
Including,
Main base station.
delete delete According to clause 12,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
Determining whether the main base station divides the portion of traffic into the sub base stations based on the distance between the sub base station and the user terminal.
Including,
Main base station.
According to clause 12,
The step of determining whether to divide the portion of traffic into the sub-base stations includes:
Determining whether the main base station divides the portion of traffic into the sub base stations based on the direction of movement of the user terminal.
Including,
Main base station.

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