KR102097408B1 - Apparatus and method for controlling to operate use carrier aggregation technology in mobile communication system - Google Patents

Abstract

In the present invention, in a method of operating and controlling a carrier aggregation (CA) technology of a base station in a mobile communication system, a process of detecting that a radio bearer is set for a user equipment (UE), and the radio bearer The process of detecting a corresponding quality of service (QoS) class indicator (QCI) and the size of data traffic to be transmitted through the radio bearer, and based on the detected QCI and data traffic size. And determining whether to apply CA technology to the UE.

Description

Control device and method for operating carrier aggregation technology in a mobile communication system {APPARATUS AND METHOD FOR CONTROLLING TO OPERATE USE CARRIER AGGREGATION TECHNOLOGY IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for controlling the operation of carrier aggregation (Carrier Aggregation: CA, hereinafter referred to as 'CA') technology in a mobile communication system.

Various technologies have been proposed to increase the data transmission rate as the mobile communication system has been developed, and a representative technology is CA technology. The CA technology is a technology that increases data rates by simultaneously using a plurality of carriers rather than a single carrier. In the CA technology, since a plurality of carriers are used, additional power consumption and additional physical layer resource consumption of a user terminal (hereinafter referred to as “UE”) are required. However, even if the CA technology is used, it may occur that the gain of using the CA technology may not be sufficiently obtained depending on the type of traffic. In this case, resource efficiency such as unnecessary UE power consumption and physical layer resource consumption may be reduced. Therefore, the efficiency of the entire mobile communication system is reduced.

Then, the CA technology will be described in detail as follows.

The CA technology is a technique of increasing a data rate by implementing a mobile communication system using a wider bandwidth than a mobile communication system using a single carrier by combining a plurality of carriers. The CA technology is to be referred to as CDMA 2000 (Ccode Division Multiple Access 2000, hereinafter referred to as 'CDMA 2000') 3rd Generation Project Partnership 2 (3GPP2: 3rd Generation Partnership Project 2, hereinafter referred to as '3GPP2'). Broadband Code Division Multiple Access (WCDMA) of mobile communication system and generation project partnership (3GPP: 3rd Generation Partnership Project, hereinafter referred to as '3GPP') will be referred to as 'WCDMA'. ) It has been reflected in various mobile communication systems such as mobile communication systems and 3GPP's Long-Term Evolution (LTE) mobile communication systems. Hereinafter, for convenience of description, the CA technology will be described as an example of an LTE mobile communication system.

The CA technology proposed in the LTE mobile communication system has compatibility with the existing single carrier technology, and a user terminal (User Equipment: UE, hereinafter referred to as 'UE') supporting the CA technology uses only a single carrier. To increase the data rate by using a wider bandwidth, that is, a plurality of single carriers compared to the legacy (legacy) UE. In the CA technology, adjacent carriers may be combined or non-adjacent carriers may be combined. The CA technology is a technology that can increase the data transmission rate of the UE using an existing mobile communication system rather than establishing a new mobile communication system infrastructure. In terms of network operation, installation is flexible and maintains compatibility with existing technology In addition, since it is possible to operate different networks for each carrier, it has the advantage of easy implementation of heterogeneous networks.

The CA technology proposed in the LTE mobile communication system was first proposed in Rel-10, and the CA technology proposed in the general LTE mobile communication system will be described with reference to FIG. 1.

1 is a diagram schematically showing a CA technology proposed in a general LTE mobile communication system.

As shown in FIG. 1, in a LTE mobile communication system, up to 5 carriers of 20 MHz can be combined to utilize a bandwidth of up to 100 MHz, and a technology capable of satisfying a relatively high data rate required over a relatively wide area to be.

 When a plurality of carriers are used in the CA technology proposed in Rel-10 of the LTE mobile communication system, a component carrier (CA, hereinafter referred to as 'CA') is divided into two types, and each CC One serving cell corresponds. Here, the carrier used by the UE in the call connection procedure is referred to as a primary component carrier (Primary Component Carrier) or a primary cell (Primary Cell: PCell, hereinafter referred to as 'PCell'), and the UE transmits data after the call connection For the additionally set carrier is referred to as a secondary component carrier (Secondary Component Carrier) or secondary cell (Secondary Cell: SCell, hereinafter referred to as 'SCell'). In the Rel-10 of the LTE mobile communication system, only one PCell is set, and up to four SCells can be set.

Then, with reference to FIG. 2, control signaling according to the CA technology proposed in the general LTE mobile communication system will be described.

2 is a diagram schematically showing control signaling according to CA technology proposed in a general LTE mobile communication system.

Referring to FIG. 2, the base station (enhanced Node B: eNB, hereinafter referred to as 'eNB') 211 may set (addition) or release (release) the SCell of the UE 211 as needed, When setting the SCell of the UE 211, the SCell may be activated or deactivated. Here, only when the SCell of the UE 211 is activated, the base station 213 allocates resources by performing a scheduling operation for the UE 211 in the SCell of the UE 211, and the UE 211 It can be transmitted by processing the data of the radio frequency (Radio Frequency: RF, hereinafter referred to as 'RF') signal. Unlike this, when the SCell of the UE 211 is deactivated, the SCell cannot perform scheduling operation or transmit data to the UE 211.

In addition, the UE 211 receives a signal by power-on an RF receiver and a modem (MODulator / DEModulator: MODEM, hereinafter referred to as 'MODEM') in a SCell-activated time period, Resource allocation information is detected from the received signal and data is restored. Alternatively, when the SCell is deactivated, the UE 211 reduces power consumption of the UE 211 by powering off the RF receiver and the MODEM receiver and not receiving the SCell signal.

As shown in FIG. 2, since SCell activation and deactivation is performed through a control element of a medium access control (MAC: Medium Access Control, hereinafter referred to as 'MAC') layer, load of a control signal It has the advantage that it is small and can be performed quickly compared to SCell setup and release made by signaling of a radio resource control (RRC: Radio Resource Control, hereinafter referred to as 'RRC') layer or call processing layer. . Therefore, SCell activation and deactivation can selectively reduce the power consumption of the UE 211 by selectively turning on the RF receiver and the MODEM of the SCell only when there is data to be transmitted according to the amount of data for the UE 211. To make.

However, since the physical channel allocation and the number of physical channel allocations of the SCell for the UE 211 are only possible through signaling of the RRC layer, physical resources are consumed even when the SCell is deactivated after setting the SCell. In addition, the UE 211 periodically measures the RF receiver and the MODEM receiver for the SCell even when the SCell is deactivated in order to measure the radio wave strength of the SCell or to quickly acquire RF reception synchronization when the SCell is activated. Turn on the power to search for the SCell signal. Therefore, even if the SCell is deactivated, when the SCell is set, physical resource consumption is caused, and even if it is smaller than the SCell activated case, it causes a certain amount of power consumption.

On the other hand, even if the mobile communication system always supports broadband transmission for all data traffic, it is not possible to obtain an increase in the data transmission rate. For example, traffic transmitted in a certain period from a UE to a UE at a certain period, such as voice communication, video telephony, chat, and multimedia messaging services (MMS: Multimedia Messaging Service, hereinafter referred to as 'MMS'), and the like. The same traffic, or traffic with a relatively low transmission amount, such as web search, e-mail, etc., is difficult to obtain a speed increase benefit even when using broadband.

On the other hand, among the traffics described above, since UE-to-UE traffic has large power consumption due to bidirectional communication, additional power consumption and physical layer resource consumption according to CA technology application rather decreases overall resource efficiency of the LTE mobile communication system. Can cause. Here, in the physical layer resource that is additionally consumed for CA technology operation, a channel quality indicator (CQI: Channel Quality Indicator, hereinafter referred to as 'CQI') used by the UE to report downlink channel quality of the SCell and a corresponding carrier Hybrid Automatic Retransmission reQuest ACKnowledgement (HARQ-ACK): Hybrid Automatic Retransmission reQuest ACKnowledgement (HARQ-ACK) It will be referred to as'), including a channel, and the CQI channel and the HARQ-ACK channel are uplink physical resources.

In addition, when operating the CA technology, additional power consumption is inevitable in order to measure and maintain synchronization of a channel state for a secondary CC. In particular, unlike a general wired device, the efficiency of power consumption in a wireless terminal device having difficulty in supplying a stable power is one of the important factors for ensuring the portability of the wireless terminal device. Therefore, when using the CA technology, the gain obtained by using the CA technology and the loss due to power consumption that may occur when using the CA technology must be considered.

However, in the existing LTE mobile communication system, the CA technology is operated without considering the characteristics and transmission amount of data traffic, and the CA technology operation process of the base station in the general LTE mobile communication system will be described with reference to FIG. 3.

3 is a diagram schematically showing a CA technology operation process of a base station in a general LTE mobile communication system.

Referring to FIG. 3, first, in step 311, the base station checks whether a SCell is set for the UE when data traffic to the UE occurs after a call connection. If the SCell is not set for the UE as a result of the inspection, the base station proceeds to step 313. In step 313, the base station determines to set the SCell for the UE, performs a control signaling operation for setting the SCell for the UE and the UE, and proceeds to step 315.

Meanwhile, if the SCell for the UE is set in step 311, the base station proceeds to step 315.

In step 315, the base station performs a scheduling operation for both the PCell and the SCell for the UE, and then proceeds to step 317. In step 317, the base station checks whether a call release command is generated. If a call release command is generated as a result of the inspection, the process up to the present is ended.

Meanwhile, if the call release command is not generated as a result of the inspection in step 317, the process returns to step 311.

As described with reference to FIG. 3, in the existing LTE mobile communication system, CA technology is operated without considering the characteristics and transmission amount of data traffic. Therefore, in a situation in which it is difficult to obtain an advantage according to broadband communication, a single or multiple SCells and It is difficult to guarantee efficiency in terms of power and physical layer resources of the base station and the UE, which are consumed to maintain the connection.

One embodiment of the present invention proposes an apparatus and method for controlling CA technology operation in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation according to characteristics of data traffic in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation according to the amount of data traffic in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation in consideration of physical layer resource efficiency in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation in consideration of power consumption of a UE in a mobile communication system.

The device proposed by the present invention; In a base station in a mobile communication system,

It detects that a radio bearer is established for a user equipment (UE), and is transmitted through the quality of service (QoS) class indicator (QoS) and the radio bearer corresponding to the radio bearer. And a controller that detects the size of data traffic and determines whether to apply a carrier aggregation (CA) technique to the UE based on the detected QCI and data traffic size.

The method proposed in the present invention; In a method of operating and controlling a carrier aggregation (CA) technology of a base station in a mobile communication system, a process of detecting that a radio bearer is set for a user equipment (UE), and a service corresponding to the radio bearer Quality of Service (QoS) class indicator (QoS Class Indicator: QCI) and the process of detecting the size of data traffic to be transmitted through the radio bearer, and based on the detected QCI and data traffic size, for the UE And determining whether to apply CA technology.

An embodiment of the present invention releases the CA function when transmitting traffic having a very small amount of data transmission even if the traffic has a GBR type of QoS type or a non-GBR type, and only when transmitting a very large amount of data transmission CA By setting the function, when the advantage of broadband transmission through the CA function is not large, radio resources due to CA operation and power consumption of the terminal can be reduced.

In addition, an embodiment of the present invention can selectively reduce the power consumption of the CA terminal and increase the resource utilization rate of the system while obtaining the gain of bandwidth expansion by selectively applying the CA function.

1 is a diagram schematically showing CA technology proposed in a general LTE mobile communication system.
2 is a diagram schematically showing control signaling according to CA technology proposed in a general LTE mobile communication system.
FIG. 3 schematically illustrates a CA technology operation process of a base station in a general LTE mobile communication system.
4 is a diagram schematically showing the internal structure of a base station in an LTE mobile communication system according to an embodiment of the present invention
5 schematically illustrates a CA technology operation control process of a base station in an LTE mobile communication system according to an embodiment of the present invention
6 is a diagram schematically showing a process of transmitting and receiving a control signal between a UE, a base station, and an EPC in an LTE mobile communication system according to an embodiment of the present invention
7 is a diagram schematically showing the internal structure of a UE in an LTE mobile communication system according to an embodiment of the present invention
8 is a diagram schematically showing the internal structure of a base station in an LTE mobile communication system according to an embodiment of the present invention
9 is a diagram schematically showing the internal structure of the EPC in the LTE mobile communication system according to an embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention are described, and descriptions of other parts will be omitted so as not to distract the subject matter of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be described in detail with reference to the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. The term and / or includes a combination of a plurality of related described items or any one of a plurality of related described items.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

One embodiment of the present invention proposes an apparatus and method for controlling the operation of carrier aggregation (Carrier Aggregation: CA, hereinafter referred to as 'CA') in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation according to characteristics of data traffic in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation according to the amount of data traffic in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation in consideration of physical layer resource efficiency in a mobile communication system.

In addition, an embodiment of the present invention proposes an apparatus and method for controlling CA technology operation in consideration of power consumption of a user terminal (hereinafter referred to as “UE”) in a mobile communication system.

The CA technology operation control apparatus and method proposed in an embodiment of the present invention will be described with reference to a mobile communication system, for example, a Long-Term Evolution (LTE) hereinafter referred to as “LTE”. However, the CA technology operation control apparatus and method proposed in an embodiment of the present invention include the LTE mobile communication system as well as the evolved packet system (EPS: Evolved Packet System, hereinafter referred to as 'EPS'), and long term Evolution-Advanced (LTE-A: Long-Term Evolution-Advanced, hereinafter referred to as 'LTE-A') Mobile communication system and high speed downlink packet access (HSDPA, hereinafter referred to as 'HSDPA') Mobile communication system, high speed uplink packet access (HSUPA, hereinafter referred to as HSUPA) mobile communication system, 3rd generation project partnership 2 (3rd generation project partnership 2: 3GPP2) , High rate packet data (HRPD, hereinafter referred to as 'HRPD') hereinafter referred to as '3GPP2') Mobile communication system, and broadband code division multiple access of 3GPP2 (WC DMA: Wideband Code Division Multiple Access (hereinafter referred to as 'WCDMA') mobile communication system, and 3GPP2 code division multiple access (CDMA: Code Division Multiple Access, hereinafter referred to as 'CDMA') mobile communication system, Of course, there may be various mobile communication systems, such as the Institute of Electrical and Electronics Engineers (IEEE) hereinafter referred to as 'IEEE' 802.16m communication system.

Then, an internal structure of an enhancement node BN in an LTE mobile communication system according to an embodiment of the present invention will be described with reference to FIG. 4 here.

4 is a diagram schematically showing the internal structure of a base station in an LTE mobile communication system according to an embodiment of the present invention.

Referring to FIG. 4, the base station includes an upper layer entity 411, a radio link control (RLC, hereinafter referred to as 'RLC') buffer 413, and medium access control (Medium). Access Control: MAC, hereinafter referred to as 'MAC') Scheduler 415, Primary Cell (PCell, hereinafter referred to as 'PCell') Physical Layer Entity 417, PCell Modem (MOdulator / DEModulator: MODEM, hereinafter referred to as 'MODEM') and radio frequency (Radio Frequency: RF, hereinafter referred to as 'RF') module 419, and secondary cell (SCell, hereinafter referred to as 'SCell') Physical layer entity 421, SCell MODEM and RF module 423, and radio resource control (RRC, hereinafter referred to as 'RRC') layer entity 425. Here, the RRC layer entity 425 is a quality of service (QoS, hereinafter referred to as 'QoS') class indicator (QoS Class Indicator: QCI, hereinafter referred to as 'QCI') type detector 427 ), A data size detector 429, and a SCell controller 431.

Here, the QCI type detector 427 performs an operation of detecting the QCI type of the corresponding radio bearer when a radio bearer is set. The data size detector 429 performs an operation of measuring an average size of data buffered in the RLC buffer 413. The SCell controller 431 performs an operation of controlling the establishment and release of the SCell for the UE according to the QoS type detected by the QCI type detector 427 and the size of the data detected by the data size detector 429. .

In addition, when the SCell is configured for the UE, the MAC scheduler 415 performs scheduling operations for both the PCell and the SCell for the UE, and only for the PCell when the SCell is released for the UE. Perform the scheduling operation for the UE.

Then, the QCI characteristics used in the LTE mobile communication system will be described with reference to Table 1 below.

QCI Resource Type Priority Packet Delay Budget Packet Error Loss Rate Example Services One GBR 2 100 ms 10 ^-2 Conversational Voice 2 4 150 ms 10 ^-3 Conversational Video (Live Streaming) 3 3 50 ms 10 ^-3 Real Time Gaming 4 5 300 ms 10 ^-6 Non-Conversational Video (Buffered Streaming) 5 Non-GBR One 100 ms 10 ^-6 IMS Signaling 6 6 300 ms 10 ^-6 Video (Buffered Streaming)
TCP-based (eg, www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.) 7 7 100 ms 10 ^-3 Voice,
Video (Live Streaming)
Interactive Gaming 8 8 300 ms 10 ^-6 Video (Buffered Streaming)
TCP-based (eg, www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.) 9 9

As shown in Table 1, in the LTE mobile communication system, nine QCIs are basically defined, and the LTE mobile communication system can add, modify, and delete QCIs as necessary as well as the nine QCIs. have. In addition, the QCI is basically a guaranteed bit rate (GBR: Guaranteed Bit Rate, hereinafter referred to as 'GBR') type and a non-guaranteed bit rate (non-GBR, hereinafter referred to as 'non-GBR') type. It is separated by. Then, each of the GBR type and the non-GBR type will be described below.

The GBR type is mainly QCI corresponding to a service requiring two-way or real-time communication, and the service corresponding to the GBR type has a traffic characteristic in which data having a preset size or less is transmitted at a preset setting cycle. . Therefore, the GBR type is a QoS type that must guarantee a preset data rate.

Unlike this, the non-GBR type does not guarantee a transmission rate, and indicates a QoS type that can obtain a benefit of increasing transmission speed or reducing transmission time with broadband transmission.

Referring to Table 1, QCI 1, QCI 2, QCI 3, and QCI 4 correspond to the GBR type, and QCI 5, QCI 6, QCI 7, QCI 8, and QCI 9 correspond to the non-GBR type. It corresponds. Here, each of QCI 1, QCI 2, QCI 3, and QCI 4 has priority 2, priority 4, priority 3, and priority 5, and QCI 5 and QCI 6 And, QCI 7, QCI 8 and QCI 9 each have priority 1, priority 6, priority 7, priority 8, and priority 9. In addition, each of the QCI 1, QCI 2, QCI 3, and QCI 4 has a packet delay budget of 100 ms, 150 ms, 50 ms, and 300 ms, and the QCI 5, QCI 6, QCI 7, QCI 8, and QCI 9 each have packet delay budgets of 100 ms, 300 ms, 100 ms, and 300 ms and 300 ms. In addition, each of the QCI 1, QCI 2, QCI 3, and QCI 4 has a packet error loss rate of 10 ^-2 , 10 ^-3 , 10 ^-3 , and 10 ^-6 . , and the 5 and QCI, QCI and 6, 7 and QCI, QCI QCI 8 and 9 each of ^{10-6, 10-6} and ^10-3, and ^10-6, and a packet error loss rate of ^10-6 Have

For example, QCI 1 is QCI corresponding to a conversational voice service, QCI 2 is QCI corresponding to a conversational video (live streaming) service, and the QCI 3 is real-time QCI corresponding to a game (Real Time Gaming) service, QCI 4 is QCI corresponding to a non-conversational video (buffered streaming) service, and the QCI 5 is an Internet protocol : IP, hereinafter referred to as 'IP') Multimedia Subsystem (IP Multimedia Subsystem: IMS, hereinafter referred to as 'IMS') QCI corresponding to signaling, wherein QCI 6 is a video (buffered streaming) service and Transmission Control Protocol (TCP, hereinafter referred to as 'TCP') based service, for example, TCP based on www, e-mail, chat, ftp, p2p file sharing, progressive video, etc. QCI corresponding to the service, the QCI 7 is a voice service, video (live streaming) service, QCI corresponding to an interactive gaming service, and the QCI 8 and QCI 9 are video (buffered streaming) Service and TCP-based services, for example, QCI against TCP-based services such as www, e-mail, chat, ftp, p2p file sharing, and progressive video.

Meanwhile, the QCI type detector 427 detects the QCI of the radio bearer established with the UE and transmits it to the SCell controller 431.

The buffer size detector 429 detects the size of data stored for scheduling in the RLC buffer 413 and transfers the value to the SCell controller 431, so that the SCell controller 431 transmits broadband. Through this, it is possible to determine whether data stored in the RLC buffer 413 can be scheduled faster. Here, it is assumed that the buffer size detector 429 detects an average size of data stored for scheduling in the RLC buffer 413 as an example.

The SCell controller 431 determines the establishment and release of the SCell for the UE based on the QCI type output from the QCI type detector 427 and the data size output from the buffer size detector 429. The MAC scheduler 415 performs a scheduling operation for the UE for the PCell and the SCell when the SCell is configured for the UE, as set by the SCell controller 431, otherwise, the SCell for the UE If not set, the scheduling operation for the UE is performed only for the PCell.

4 illustrates the internal structure of a base station in the LTE mobile communication system according to an embodiment of the present invention. Next, referring to FIG. 5, the CA technology operation of the base station in the LTE mobile communication system according to an embodiment of the present invention The control process will be described.

5 is a diagram schematically showing a CA technology operation control process of a base station in an LTE mobile communication system according to an embodiment of the present invention.

Before describing FIG. 5, the CA technology operation control process of the base station in the LTE mobile communication system according to an embodiment of the present invention may include the following steps.

(a) UE accessed step

(b) Data traffic

(c) Determining whether gain is possible when applying CA technology to the data traffic

(d) If the data traffic is data traffic that is difficult to obtain a gain when applying the CA technology, do not use the CA technology and maintain a CA release mode that does not use the CA technology for the corresponding data traffic. Here, the time period in which the corresponding data traffic is maintained may be, for example, a frame.

When the radio bearer for the new data traffic is set, the base station checks whether the resource type of the radio bearer is GBR type. As a result of the inspection, if more than one GBR type-wireless bearer is set, the CA technology is not applied to the new data traffic because it is irrelevant to the CA technology application gain, thus maintaining the CA release mode.

On the other hand, if the GBR type-wireless bearer is not set as a result of the inspection, the base station detects the data size buffered by the RLC buffer included in the base station, and the detected data size is gained when CA technology is applied. CA is operated only when BO is large enough to obtain, and CA is not operated when small.

Then, the CA technology operation control process of the base station will be described in detail with reference to FIG. 5 as follows.

First, in step 511, the base station checks whether at least one GBR-wireless bearer is set for data traffic generated after the UE accesses the call. When at least one GBR-wireless bearer is set for the data traffic as a result of the inspection, the base station proceeds to step 531. In step 531, the base station checks whether the SCell is set for the UE. When the SCell is set for the UE as a result of the inspection, the base station proceeds to step 525. Meanwhile, if the SCell is not set for the UE as a result of the inspection in step 531, the base station proceeds to step 527. That is, when one or more GBR-wireless bearers are configured for the data traffic, the base station starts data communication only through PCell in CA release mode until the one or more GBR-bearers are released, and the data traffic It remains in that state for the duration of the frame it is holding. Unlike this, if CA technology is applied to the UE, the base station releases the SCell, transmits a corresponding control signal according to the SCell release to the UE, and transmits data traffic only through the PCell.

On the other hand, if at least one GBR-wireless bearer is not configured for the data traffic as a result of the inspection in step 511, the base station proceeds to step 513. In step 513, the base station calculates the average data size (BO) of each of the non-GBR bearers set for the data traffic and proceeds to step 515.

In step 515, the base station checks whether the SCell is set for the UE. When the SCell is not set for the UE as a result of the inspection, that is, when the SCell is released for the UE, the base station proceeds to step 517. In step 517, the base station checks whether the average BO is greater than a preset threshold 1 (th_add). If the average BO is greater than the threshold 1 (th_add) as a result of the inspection, the base station proceeds to step 519. In step 519, the base station sets the SCell for the UE, transmits a control signal corresponding to the SCell setting to the UE, and then proceeds to step 521. In step 521, the base station performs a scheduling operation for the PCell and the SCell to transmit data traffic to the UE using both the PCell and the SCell.

Meanwhile, if the average BO is not greater than the threshold 1 (th_add) as a result of the inspection in step 517, the process proceeds to step 527. In step 527, the base station maintains the CA release mode for the UE, performs a scheduling operation for the PCell to transmit data traffic only through the PCell, and proceeds to step 529.

Meanwhile, when the SCell is set for the UE as a result of the inspection in step 515, the base station proceeds to step 523. In step 523, the base station checks whether the average BO is smaller than a preset threshold 2 (th_rel). If the average BO is smaller than the threshold 2 (th_rel) as a result of the inspection, the base station proceeds to step 525. In step 525, the base station releases the SCell for the UE, transmits a corresponding control signal according to the SCell release to the UE, and then proceeds to step 527. In step 527, the base station performs a scheduling operation for the PCell to transmit data traffic only through the PCell and proceeds to step 529.

Meanwhile, if the average BO is less than the threshold 2 (th_rel) as a result of the inspection in step 523, that is, if the average BO is equal to or greater than the threshold 2 (th_rel), the base station proceeds to step 521. In step 521, the base station maintains the CA setting state for the UE, performs scheduling operation for the PCell and the SCell to transmit traffic data using both PCell and SCell, and proceeds to step 529.

The base station repeatedly performs all steps after the call connection as described above until a call release command is detected in step 529, and releases the call when a call release command is detected.

In FIG. 5, the CA technology operation control process of the base station in the LTE mobile communication system according to an embodiment of the present invention is described. Next, referring to FIG. 6, the UE and the LTE mobile communication system according to an embodiment of the present invention are described. , Control signal transmission / reception process between the base station and the evolved packet core (Evloved Packet Core: EPC, hereinafter referred to as 'EPC') will be described.

6 is a diagram schematically showing a process of transmitting and receiving a control signal between a UE, a base station, and an EPC in an LTE mobile communication system according to an embodiment of the present invention.

Referring to FIG. 6, the LTE mobile communication system includes a UE 611, a base station 613, and an EPC 615.

When a new radio bearer is set up from the EPC 615 to the base station 613, the base station 613 checks whether the corresponding radio bearer is a GBR type-wireless bearer. When all bearers are not GBR, the average BO information is received from the RLC buffer, and if it is greater than the threshold 1 (th_add), the SCell setup process is started. The SCell can be set in advance or searched using a measurement report.

When the SCell is set, the average BO information is periodically received from the RLC buffer, and if it is smaller than the threshold 2 (th_rel), the SCell is released.

6 illustrates a process of transmitting / receiving a control signal between a UE, a base station, and an EPC in an LTE mobile communication system according to an embodiment of the present invention. Next, referring to FIG. 7, LTE according to an embodiment of the present invention The internal structure of the UE in the mobile communication system will be described.

7 is a diagram schematically showing an internal structure of a UE in an LTE mobile communication system according to an embodiment of the present invention.

Referring to FIG. 7, the UE 700 includes a receiver 711, a controller 713, a storage unit 715, and a transmitter 717.

The controller 713 controls the overall operation of the UE 700, and in particular, performs operations related to operations for controlling CA technology operation. The operation of controlling the CA technology operation by the UE 700 is the same as that described with reference to FIGS. 4 to 6, so a detailed description thereof will be omitted here.

The receiver 711 receives various messages and the like under the control of the controller 713.

The storage unit 715 stores various messages received by the receiver 711 and various data necessary for the operation of the UE 700.

The transmitter 717 transmits various messages and the like under the control of the controller 713.

Meanwhile, FIG. 7 illustrates a case where the UE 700 is implemented with the receiver 711, the controller 713, the storage unit 715, and the transmitter 717 as separate units. Of course, the UE 700 may be implemented as one unit in which the receiver 711, the controller 713, the storage unit 715, and the transmitter 717 are integrated and implemented.

In FIG. 7, the internal structure of the UE in the LTE mobile communication system according to an embodiment of the present invention will be described. Next, referring to FIG. 8, the interior of the base station in the LTE mobile communication system according to an embodiment of the present invention will be described. The structure will be described.

8 is a diagram schematically showing an internal structure of a base station in an LTE mobile communication system according to an embodiment of the present invention.

8, the base station 800 includes a receiver 811, a controller 813, a storage unit 815, and a transmitter 817.

The controller 813 controls the overall operation of the base station 800, and in particular, controls to perform operations related to operations for controlling CA technology operation. The operation of controlling the CA technology operation by the base station 800 is the same as that described with reference to FIGS. 4 to 6, and thus detailed description thereof will be omitted.

The receiver 811 receives various messages and the like under the control of the controller 813.

The storage unit 815 stores various messages received by the receiver 811 and various data necessary for the operation of the base station 800.

The transmitter 817 transmits various messages and the like under the control of the controller 813.

Meanwhile, FIG. 8 illustrates a case where the base station 800 is implemented by the receiver 811, the controller 813, the storage unit 815, and the transmitter 817 as separate units. Of course, the base station 800 can be implemented as one unit in which the receiver 811, the controller 813, the storage unit 815, and the transmitter 817 are integrated.

8 illustrates the internal structure of a base station in an LTE mobile communication system according to an embodiment of the present invention. Next, referring to FIG. 9, the internal structure of the EPC in the LTE mobile communication system according to an embodiment of the present invention is described. It will be described.

9 is a diagram schematically showing the internal structure of an EPC in an LTE mobile communication system according to an embodiment of the present invention.

9, the EPC 900 includes a receiver 911, a controller 913, a storage unit 915, and a transmitter 917.

The controller 913 controls the overall operation of the EPC 900, and in particular, controls to perform operations related to operations for controlling CA technology operation. The operation of the EPC 900 to control the operation of CA technology is the same as that described with reference to FIGS. 4 to 6, so a detailed description thereof will be omitted here.

The receiver 911 receives various messages and the like under the control of the controller 913.

The storage unit 915 stores various messages received by the receiver 911 and various data necessary for the operation of the EPC 900.

The transmitter 917 transmits various messages and the like under the control of the controller 913.

Meanwhile, FIG. 9 illustrates a case where the EPC 900 is implemented by the receiver 911, the controller 913, the storage unit 915, and the transmitter 917 as separate units. Of course, the EPC 900 can be implemented as one unit in which the receiver 911, the controller 913, the storage unit 915, and the transmitter 917 are integrated and implemented.

Those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

On the other hand, in the specification and drawings, preferred embodiments of the present invention have been disclosed, and although specific terms have been used, they are merely used in a general sense to easily describe the technical contents of the present invention and to help understand the invention. It is not intended to limit the scope of the invention. It is obvious to those skilled in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims (14)

In the method of operating and controlling a carrier aggregation (CA) technology of a base station in a mobile communication system,
A process of detecting that a radio bearer is set for a user equipment (UE),
A process of detecting a quality of service (QoS) class indicator (QCI) corresponding to the radio bearer and a size of data traffic to be transmitted through the radio bearer;
And determining whether to apply CA technology to the UE based on the detected QCI and data traffic size.
According to claim 1,
The process of determining whether to apply CA technology to the UE based on the detected QCI and data traffic size includes:
Whether the detected QCI is a guaranteed bit rate (GBR) type, whether a secondary cell (Secondary Cell: SCell) is set for the UE, and the size of the threshold data traffic in which the data traffic size is preset And determining whether to apply CA technology to the UE based on at least one of whether or not it exceeds.
According to claim 1,
When the QCI is a Guaranteed Bit Rate (GBR) type and a secondary cell (SCell) is set for the UE, the secondary cell is released, and a control signal according to the release of the secondary cell is released. Method for controlling the CA technology operation of the base station further comprising the step of transmitting to the UE.
According to claim 1,
When the QCI is a guaranteed bit rate (GBR) type, and a secondary cell (SCell) is not set for the UE, a scheduling operation for a primary cell (PCell) is performed. A method for controlling CA technology operation of a base station further comprising a process.
According to claim 1,
The QCI is a non-guaranteed bit rate type (non-GBR: non-Guaranteed Bit Rate) CA CA operation control method of a base station, characterized in that.

The method of claim 5,
When a secondary cell (SCell) is not set for the UE and the size of data traffic to be transmitted through the radio bearer is greater than a preset threshold data traffic size,
Further comprising the step of configuring the secondary cell for the UE, transmitting a control signal corresponding to the setting of the secondary cell to the UE, and performing a scheduling operation for the primary cell and the secondary cell Control method of base station CA technology operation.
The method of claim 5,
When a secondary cell (SCell) is set for the UE and the size of data traffic to be transmitted through the radio bearer is smaller than a preset threshold data traffic size,
The CA technology operation of the base station further comprising the step of releasing the secondary cell for the UE, transmitting a control signal corresponding to the secondary cell release to the UE, and performing a scheduling operation only through the primary cell. Control method.
In a base station in a mobile communication system,
It detects that a radio bearer is established for a user equipment (UE), and is transmitted through the quality of service (QoS) class indicator (QoS) and the radio bearer corresponding to the radio bearer. And a controller for detecting the size of data traffic and determining whether to apply carrier aggregation (CA) technology to the UE based on the detected QCI and data traffic size. .
The method of claim 8,
The controller;
Whether the detected QCI is a guaranteed bit rate (GBR) type, whether a secondary cell (Secondary Cell: SCell) is set for the UE, and the size of the threshold data traffic in which the data traffic size is preset Base station characterized in that to determine whether to apply the CA technology to the UE based on at least one of whether or not exceeded.
The method of claim 8,
The controller;
When the QCI is a guaranteed bit rate type (GBR: Guaranteed Bit Rate) and a secondary cell (SCell) is set for the UE, the secondary cell is released, and a control signal according to the release of the secondary cell Base station, characterized in that for transmitting to the UE.
The method of claim 8,
The controller;
If the QCI is a guaranteed bit rate type (GBR: Guaranteed Bit Rate), and a secondary cell (SCell) is not set for the UE, performing scheduling operation for a primary cell (PCell). Base station characterized by.
The method of claim 9,
The QCI is a non-guaranteed bit rate type (non-GBR: non-Guaranteed Bit Rate), the base station characterized in that for detecting the amount of data traffic to be transmitted through the radio bearer.

The method of claim 12,
The controller;
When a secondary cell (SCell) is not set for the UE and the size of data traffic to be transmitted through the radio bearer is greater than a preset threshold data traffic size,
The base station, characterized in that for setting the secondary cell for the UE, transmits a control signal corresponding to the setting of the secondary cell to the UE, and performs a scheduling operation for the primary cell and the secondary cell.
The method of claim 12,
The controller;
When a secondary cell (SCell) is set for the UE and the size of data traffic to be transmitted through the radio bearer is smaller than a preset threshold data traffic size,
Base station characterized in that the release of the secondary cell for the UE, and transmits a corresponding control signal according to the secondary cell release to the UE, and performs a scheduling operation only through the primary cell.

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