KR102129957B1 - Methods for transmitting and receiving data and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting and receiving data by a terminal and a base station. More specifically, the present invention relates to a method and apparatus for controlling an aggregate maximum bit rate of a terminal using radio resources provided by a plurality of base stations connected through non-ideal backhaul. Particularly, in a method of transmitting and receiving data by a second base station, receiving total maximum bit rate information of a second base station terminal from a first base station constituting a dual connection to a terminal and downlink based on total maximum bit rate information of a second base station terminal Providing a method and apparatus including generating link control information and transmitting downlink control information to a terminal, wherein the downlink control information includes at least one of uplink grant information and downlink allocation information.

Description

A method for transmitting and receiving data and a device therefor

The present invention relates to a method and apparatus for transmitting and receiving data by a terminal and a base station. More specifically, the present invention relates to a method and apparatus for controlling the aggregate maximum bit rate (Aggregate Maximum Bit Rate) of a terminal using a radio resource provided by a plurality of base stations connected through a non-ideal backhaul (backhaul).

With the development of communication systems, consumers such as businesses and individuals have used a wide variety of wireless terminals.

In the current 3GPP series of mobile communication systems such as LTE (Long Term Evolution) and LTE-Advanced, a high-speed and large-capacity communication system that can transmit and receive various data such as video and wireless data is required beyond voice-oriented services.

For such a high-speed, large-capacity communication system, a technology capable of increasing the capacity of a terminal by utilizing a small cell is required. That is, there is a need for a technique for increasing traffic throughput by transmitting/receiving data using a macro cell having a wide coverage and a small cell having a relatively narrow coverage. In this situation, research into a technique for transmitting and receiving data to and from a terminal through a plurality of base stations including a base station providing a macro cell and a base station providing a small cell has been actively conducted.

Meanwhile, a UE-Aggregate Maximum Bit Rate (UE-AMBR), which is a subscription parameter stored in the APN, limits the total bit rate of uplink and downlink data of the UE. However, the conventional UE-AMBR is related to the total maximum bit rate of the terminal, and when the terminal transmits and receives data using the plurality of base stations described above, each base station uses the UE-AMBR to individually transmit and receive data of the terminal. In the case of limiting the total bit rate, a problem of redundancy limitation may occur, or a problem that is not properly limited may occur.

The present invention devised in accordance with the above-mentioned request is to provide a method and apparatus for effectively controlling the total maximum bit rate of a terminal when the terminal configures a dual connection with a plurality of base stations.

In addition, the present invention is to provide a method and apparatus for solving a problem in which a data transmission/reception limiting capacity of a terminal is substantially increased when a total maximum bit rate of the terminal is applied to a plurality of base stations.

In addition, the present invention provides a method and apparatus for performing more efficient terminal data transmission and reception control by changing/adjusting the total maximum bit rate according to the channel state or load of the base station, among any of a plurality of base stations constituting a dual connection with the terminal. do.

In order to solve the above-described problem, the present invention is a method for a second base station to transmit and receive data, the method comprising: receiving a total maximum bit rate information of a second base station terminal from a first base station constituting a dual connection to the terminal and a second base station terminal And generating downlink control information based on the total maximum bit rate information and transmitting downlink control information to the terminal, wherein the downlink control information includes at least one of uplink grant information and downlink allocation information. Provides a method.

In addition, the present invention, in a method for a terminal to transmit and receive data, at least one of uplink grant information and downlink allocation information from the step of configuring a dual connectivity (Dual connectivity) with the first base station and the second base station And receiving and transmitting data to and from a second base station based on the downlink control information, wherein the downlink control information is based on the total maximum bit rate information of the second base station terminal. It provides a way to be determined.

In addition, the present invention, the second base station for transmitting and receiving data, based on a receiver for receiving the maximum maximum bit rate information of the second base station terminal from the first base station constituting a dual connection to the terminal and the maximum maximum bit rate information of the second base station terminal A control unit generating downlink control information and a transmitting unit transmitting downlink control information to a terminal, the downlink control information provides a second base station apparatus including at least one of uplink grant information and downlink allocation information. .

In addition, the present invention, in a terminal for transmitting and receiving data, at least one of uplink grant information and downlink allocation information from a control unit and a second base station configuring dual connectivity with the first base station and the second base station. It includes a receiving unit for receiving the downlink control information, and receiving data from a second base station based on the downlink control information and a transmitting unit for transmitting data to the second base station based on the downlink control information, the downlink The link control information provides a terminal device determined based on the total maximum bit rate information of the second base station terminal.

According to the present invention described above, when the terminal configures a dual connection with a plurality of base stations, it is effective to effectively control the total maximum bit rate of the terminal.

In addition, according to the present invention, when the total maximum bit rate of the terminal is applied to a plurality of base stations overlapping, there is an effect of solving the problem that the data transmission/reception limit capacity of the terminal is substantially increased.

In addition, according to the present invention, any base station among a plurality of base stations constituting a dual connection with a terminal has an effect of performing more efficient terminal data transmission/reception control by changing/adjusting the total maximum bit rate according to the channel state or load of the base station.

1 is a diagram illustrating an example of a dual connection structure.
2 is a view showing another example of a dual connection structure.
3 is a signal diagram for explaining, for example, a second base station addition/modification procedure.
4 is a flowchart illustrating the operation of a second base station according to an embodiment of the present invention.
5 is a flowchart illustrating the operation of a second base station according to another embodiment of the present invention.
6 is a flowchart illustrating a terminal operation according to another embodiment of the present invention.
7 is a diagram illustrating an example of a Bearer Modification Procedure with Bearer QoS Update.
8 is a block diagram showing the configuration of a base station according to another embodiment of the present invention.
9 is a block diagram showing the configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (Base Station, BS, or eNB). The user terminal in the present specification is a comprehensive concept that refers to a terminal in wireless communication, as well as UE (User Equipment) in WCDMA and LTE, HSPA, MS (Mobile Station) in GSM, UT (User Terminal), SS It should be interpreted as a concept including (Subscriber Station), wireless devices, etc.

Base station or cell (cell) generally refers to a station (station) to communicate with the user terminal, Node-B (Node-B), eNB (evolved Node-B), sector (Sector), site (Site), BTS ( Base Transceiver System), an access point (Access Point), a relay node (Relay Node), RRH (Remote Radio Head), RU (Radio Unit), can be called in other terms such as small cells.

That is, in this specification, a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or sector (site) in LTE, and the like. It should be interpreted as, and it means to cover all of the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above have a base station that controls each cell, the base station can be interpreted in two ways. It may be i) a device providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to the radio area, or ii) the radio area itself may be indicated. In i), all devices that provide a predetermined wireless area are controlled by the same entity, or all devices that interact to configure the wireless area in a collaborative manner are instructed to the base station. ENB, RRH, antenna, RU, LPN, point, transmit/receive point, transmit point, receive point, etc., according to the configuration method of the radio area, are an embodiment of the base station. In ii), the radio area itself, which receives or transmits a signal from the perspective of the user terminal or the neighboring base station, may indicate to the base station itself.

Accordingly, megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node (LPN), point, eNB, transmit/receive point, transmit point, receive point are collectively referred to as base stations. do.

In this specification, a user terminal and a base station are two transmission/reception subjects used to implement the technology or technical idea described in this specification and are used in a comprehensive sense and are not limited by terms or words specifically referred to. The user terminal and the base station are two (Uplink or Downlink) transmission/reception subjects used to implement the technology or technical idea described in the present invention and are used in a comprehensive sense and are not limited by terms or words specifically referred to. Here, uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data to the base station by the user terminal, downlink (Downlink, DL, or downlink) transmits and receives data to the user terminal by the base station Means the way.

There are no restrictions on the multiple access technique applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. An embodiment of the present invention can be applied to resource allocation in asynchronous wireless communication evolving to LTE and LTE-Advanced via GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be interpreted as being limited or limited to a specific wireless communication field, but should be interpreted as including all technical fields to which the spirit of the present invention can be applied.

For uplink transmission and downlink transmission, a time division duplex (TDD) method transmitted using different times may be used, or a frequency division duplex (FDD) method transmitted using different frequencies may be used.

In addition, in systems such as LTE and LTE-Advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and downlink include PDCCH (Physical Downlink Control CHannel), PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid ARQ Indicator CHannel), PUCCH (Physical Uplink Control CHannel), EPDCCH (Enhanced Physical Downlink Control CHannel), etc. Control information is transmitted through the same control channel, and is composed of data channels such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) to transmit data.

Meanwhile, control information may be transmitted by using an enhanced PDCCH (EPDCCH) or an extended PDCCH.

In this specification, a cell is a component carrier having a coverage of a signal transmitted from a transmission/reception point or a signal transmitted from a transmission/reception point, or a transmission/reception point itself. Can.

The wireless communication system to which the embodiments are applied is a multi-point transmission/reception system (CoMP system) in which two or more transmission/reception points cooperate to transmit a signal, or a coordinated multi-antenna transmission method. antenna transmission system), and a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission/reception points and terminals.

The multiple transmission/reception points include at least one of a base station or a macro cell (hereinafter referred to as'eNB') and a high transmission power, which is wired and controlled by an optical cable or an optical fiber to the eNB, or a low transmission power in the macro cell area. It may be RRH.

Hereinafter, downlink refers to a communication or communication path from a multiple transmission/reception point to a terminal, and uplink refers to a communication or communication path from a terminal to a multiple transmission/reception point. In the downlink, a transmitter may be a part of multiple transmission/reception points, and a receiver may be a part of a terminal. In the uplink, a transmitter may be a part of a terminal, and a receiver may be a part of multiple transmission/reception points.

Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is also described in the form of “transmit and receive PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH”.

In addition, hereinafter, description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used in a sense including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and are also used to include both PDCCH and EPDCCH.

In addition, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to a part described with PDCCH, and EPDCCH may be applied to a part, described with EPDCCH, as an embodiment of the present invention.

Meanwhile, High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to terminals. The eNB is a downlink control information and an uplink data channel such as a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and scheduling required for receiving the PDSCH (eg For example, a physical downlink control channel (PDCCH) for transmitting scheduling approval information for transmission in a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described as a form in which the corresponding channel is transmitted and received.

Small cells using low-power nodes are being considered as a means to cope with the explosion of mobile traffic. The low power node represents a node that uses low transmit (Tx) power compared to a general macro node.

Prior to 3GPP Release 11, carrier aggregation (hereinafter referred to as CA) technology was able to construct a small cell using a low-power remote radio head (RRH), which is a geographically dispersed antenna within macro cell coverage.

However, in order to apply the above-described CA technology, the macro cell and the RRH cell are constructed to be scheduled under the control of one base station, and for this purpose, an ideal backhaul construction between the macro cell node and the RRH is required.

An ideal backhaul means a backhaul that exhibits very high throughput and very little delay, such as an optical fiber, dedicated point-to-point connection using LOS microwaves (Line Of Sight microwaves).

In contrast, a backhaul that exhibits relatively low throughput and large delay, such as xDSL (Digital Subscriber Line) and Non LOS microwave, is called a non-ideal backhaul.

A plurality of serving cells may be merged through a single base station-based CA technology described above to provide a service to the terminal. That is, a plurality of serving cells may be configured for a terminal in a CONNECTED state (Radio Resource Control, hereinafter referred to as'RRC'), and when an ideal backhaul is established between a macro cell node and an RRH, the macro cell The RRH cell and the serving cell are configured together to provide a service to the terminal.

When the CA technology based on a single base station is configured, the terminal may have only one RRC connection with the network.

RRC connection (establishment) / re-establishment (re-establishment) / one serving cell in the handover Non-Access Stratum (hereinafter referred to as'NAS') mobility (for example, TAI) Tracking Area Identity) and one serving cell provides security input in RRC connection reset/handover. This cell is called a primary cell (PCell). PCell can only be changed with a handover procedure. Secondary cells (SCells) may be configured as a serving cell together with a PCell according to terminal capabilities.

Multiple carrier attributes of the physical layer according to a single eNB-based CA affect only the MAC layer (Medium Access Control). The MAC layer has one independent Hybrid Automatic Retransmit reQuest (HARQ) entity for each serving cell in the uplink and downlink. Each HARQ entity processes a data stream of a component carrier (CC).

Dual Connectivity( Dual Connectivity )

Dual connectivity refers to an operation in which an RRC CONNECTED terminal uses radio resources provided by at least two different network points (master base stations and secondary base stations) connected by non-ideal backhaul. In dual connectivity, a master base station (MeNB) indicates a base station that terminates S1-MME and acts as a mobility anchor toward the core network (CN). The master base station may be referred to as a MeNB or Macro eNB or Primary eNB or Macrocell eNB. In dual connectivity, a secondary base station (SeNB) represents a base station that is not a master base station as a base station providing additional radio resources for the terminal. The secondary base station may be referred to as a SeNB or small cell eNB or small eNB or assisting eNB.

At this time, a group of serving cells associated with the MeNB is called a master cell group (MCG), and a group of serving cells associated with the SeNB is called a secondary cell group (SCG).

SeNB has at least one special cell containing PUCCH. That is, at least one cell in the SeNB has a configured uplink. And one of them is configured with PUCCH resources (At least one cell in SeNB has configured UL and one of them is configured with PUCCH resources).

Hereinafter, in this specification, a master base station is referred to as a MeNB or a first base station, and a secondary base station is referred to as a SeNB or a second base station.

1 is a diagram illustrating an example of a dual connection (dual connectivity) structure.

1 shows an example of a dual connectivity structure using radio resources provided by two base stations connected by non-ideal backhaul. When dual connectivity is configured in the terminal in the structure as shown in FIG. 1, the terminal may configure a specific data radio bearer as a bearer dedicated to a specific base station. For example, the terminal may configure a specific radio bearer for voice service as a data radio bearer dedicated to the first base station (MCG bearer), and a specific radio bearer for Internet service as a data radio bearer dedicated to the second base station (SCG bearer) Can be configured. For a specific MCG data radio bearer or a specific SCG radio bearer, only one base station has a PDCP entity, an RLC entity and a MAC entity. The terminal has an entity in the terminal peered to each entity.

2 is a view showing another example of a dual connection structure.

2 shows another example of a dual connectivity structure using radio resources provided by two base stations connected by non-ideal backhaul. When dual connectivity is configured in the terminal in the structure shown in FIG. 2, the terminal may be configured by splitting a specific data radio bearer through two base stations (MeNB and SeNB).

Hereinafter, a bearer configured by being separated through two base stations is referred to as a split radio bearer or an MCG-SCG radio bearer. For a specific isolated radio bearer, each base station has an independent RLC entity (MeNB is a MeNB RLC entity, SeNB is a SeNB RLC entity) and a MAC entity (MeNB is a MeNB MAC entity, SeNB is a SeNB MAC entity). The terminal has an object in the terminal peered to the object.

Total maximum bit rate ( Aggregate Maximum Bit Rate , AMBR )

APN-AMBR (Access point name-Aggregate Maximum Bit Rate) is a subscription parameter that is stored for each APN in the Home Subscriber Server (HSS). APN-AMBR limits the total bit rate expected to be provided over all Non-GBR (Guaranteed Bit Rate) bearers and all Packet Data Network (PDN) connections of the same APN (The APN AMBR is a subscription parameter stored per APN in the HSS.It limits the aggregate bit rate that can be expected to be provided across all Non GBR bearers and across all PDN connections of the same APN).

UE-AMBR is a subscription parameter stored in the HSS. The Mobility Management Entity (MME) must set the UE-AMBR to the sum of APN AMBRs of all active APNs up to the subscribed UE-AMBR value. UE-AMBR limits the total bit rate expected to be provided through all non-GBR (Guaranteed Bit Rate) bearers for one UE. For example, excess traffic can be discarded by the rate shaping function (The UE-AMBR is limited by a subscription parameter stored in the HSS.The MME shall set the UE-AMBR to the sum of the APN-AMBR of all active APNs up to the value of the subscribed UE AMBR.The UE AMBR limits the aggregate bit rate that can be expected to be provided across all Non GBR bearers of a UE (eg excess traffic may get discarded by a rate shaping function) GBR bearers are outside the scope of UE-AMBR.).Each of those Non GBR bearers could potentially utilize the entire UE-AMBR, eg when the other Non GBR bearers do not carry any traffic.

The E-UTRAN enforces (or applies) UE-AMBR parameters in the uplink and downlink (The E-UTRAN enforces the UE-AMBR in uplink and downlink). In the conventional E-UTRAN technology, UE-AMBR in uplink and downlink can be executed through a single base station. However, when a dual connection is configured in the terminal, the UE-AMBR can be executed only in the first base station because the first base station is delivered from the MME, so that the total maximum bit rate provided through two data transmission paths between the terminal and the base station There was a problem that can not be effectively limited or controlled. That is, when two different base stations, the first base station (MeNB) and the second base station (SeNB), which are non-ideal backhaul to the terminal, provide a dual connection, the total provided through two data transmission paths between the terminal and the base station The bit rate could not be effectively limited or controlled.

In the present invention, a case where the first base station and the second base station configure a dual connection with the terminal will be described as an example. However, the present invention can be applied to the case where a plurality of base stations are configured with a terminal, and is not limited to two base stations. Hereinafter, the description will be mainly focused on the case where two base stations form a dual connection, but the idea of the present invention may be applied to the case of multiple base stations.

The present invention, devised to solve the above-described problem, is a terminal total of terminals configured to use radio resources provided by two different base stations connected to a non-ideal backhaul, the first base station (MeNB) and the second base station (SeNB1). It is intended to provide a method and apparatus for effectively limiting or controlling a maximum bit rate (UE-AMBR).

3 is a signal diagram for explaining, for example, a second base station addition/modification procedure.

Referring to FIG. 3, each step will be described in detail with respect to a procedure of adding or modifying a second base station in a dual connection configuration situation.

The MeNB 301 determines a request to add or modify SeNB radio resources for a specific E-RAB(s) (S300).

Or, the SeNB 302 determines modification of radio resources for a specific E-RAB(s) (S305).

The MeNB 301 requests the SeNB 302 to allocate or modify radio resources (S310).

If the radio resource management (RRM) entity in the SeNB 302 can accept the resource request, the radio resource is configured. Then, each transmission network resource is configured according to the user plane structure option (S315).

Thereafter, the SeNB 302 provides a radio resource configuration to the MeNB 301 (S320). That is, the SeNB 302 may transmit a SeNB addition or modification command to the MeNB 301.

The MeNB 301 triggers the terminal 300 to apply a new configuration (S325). For example, the MeNB 301 may trigger an RRC connection reconfiguration message to the terminal 300 to apply a new configuration. The terminal 300 applies a new configuration.

In the case of a radio bearer having a user plane structure as shown in FIG. 1, the MeNB 301 may transmit a sequence number status report to the SeNB 302 (S330). Alternatively, in the case of a radio bearer having a user plane structure as shown in FIG. 1, the MeNB 301 may forward data to the SeNB 302 (S335).

The terminal 300 completes the reconfiguration procedure. For example, the terminal 300 may complete the reconfiguration procedure and transmit an RRC connection reconfiguration completion message to the MeNB 301 (S340).

If necessary, the terminal 300 may perform a synchronization procedure with the SeNB 302 (S345).

The SeNB 302 may report the completion or addition of the SeNB to the MeNB 301 (S350). Alternatively, the MeNB 301 may report the completion or addition of the SeNB to the SeNB 302.

In the case of a radio bearer having a user plane structure as shown in FIG. 1, a user plane path update procedure is performed on the core network. For example, the MeNB 301 may transmit an E-RAB modification indication to the MME 304 (S355). The MME 304 may perform an S-GW 303 and a bearer modification procedure (S360). Thereafter, the MME 304 may transmit an E-RAB modification confirmation message to the MeNB 301 (S365). Through this, the user plane path updater of the added or modified SeNB 302 can be completed.

In the above, the procedure for adding or modifying a second base station for dual connectivity or in a dual connectivity situation has been described with reference to FIG. 3. Hereinafter, a method for enforcing the base station to apply UE-AMBR will be briefly described.

For example, the base station can ensure that the UE-AMBR is not exceeded by limiting the entire scheduling grant of the terminal. Specifically, the base station can control the uplink UE-AMBR not to be exceeded by limiting the uplink grant. Alternatively, the base station may control the downlink UE-AMBR not to be exceeded by limiting downlink assignment. However, when a dual connection is configured as described above, since each base station can apply UE-AMBR with an independent scheduler, problems may occur when each base station independently applies the existing UE-AMBR. . For example, if each base station independently applies UE-AMBR in a case in which a separate radio bearer is configured using two base stations, a problem that a UE-AMBR value is doubled for a corresponding terminal may occur. Therefore, a method of setting a UE-AMBR so that the UE-AMBR is not exceeded when each base station providing dual connectivity applies UE-AMBR is required.

Hereinafter, a method for setting and changing a UE-AMBR in a dual connection situation according to the present invention will be specifically described with reference to each embodiment.

4 is a flowchart illustrating the operation of a second base station according to an embodiment of the present invention.

In a method of transmitting and receiving data by a second base station according to an embodiment of the present invention, receiving the maximum maximum bit rate information of the second base station terminal from the first base station constituting a dual connection to the terminal and the maximum maximum of the second base station terminal A method comprising generating downlink control information based on bit rate information and transmitting downlink control information to a terminal, wherein the downlink control information includes at least one of uplink grant information and downlink allocation information. to provide.

Referring to Figure 4, the second base station of the present invention includes the step of receiving the total maximum bit rate information of the second base station terminal (S410). As described above, the second base station may configure a dual connection to the terminal together with the first base station. The second base station means SeNB in the present specification, and the first base station means MeNB. For example, the above-described UE-AMBR means total maximum bit rate information (terminal total maximum bit rate information) of a terminal determined in a core network or an upper layer. Further, the second maximum base station terminal total bit rate information (SeNB UE-AMBR) means total maximum bit rate information executed by the second base station. Similarly, the first base station may have the first base station terminal total maximum bit rate information (MeNB UE-AMBR). That is, in order to solve the above-mentioned problems, the conventional terminal total maximum bit rate information (UE-AMBR) includes the first base station terminal total maximum bit rate information (MeNB UE-AMBR) and the second base station terminal total maximum bit rate information (SeNB UE-AMBR). ). Therefore, each base station can control the transmission bit rate of the terminal by using the terminal maximum maximum bit rate information (eg, MeNB UE-AMBR and SeNB UE-AMBR) applied to each base station.

By adjusting the maximum maximum bit rate information of the first base station terminal and the maximum maximum bit rate information of the second base station terminal, it is possible to solve a problem caused by overlapping application of the maximum maximum bit rate information of the terminal.

The second base station may include generating downlink control information based on the total maximum bit rate information of the received second base station terminal (S420 ). For example, the second base station may generate downlink control information in order to control uplink or downlink data of the terminal using the total maximum bit rate information of the received second base station terminal. The downlink control information may include uplink grant information for scheduling uplink data. Alternatively, the downlink control information may include downlink allocation information for scheduling downlink data. Through this, the second base station can limit or control data transmission and reception of the terminal based on the total maximum bit rate information of the second base station terminal. For example, the sum of the maximum maximum bit rate information of the second base station terminal and the maximum maximum bit rate information of the first base station terminal may be set equal to the maximum maximum bit rate information of the terminal. Accordingly, it is possible to solve the problem by preventing the application of the double data bit rate that may occur when each of the above-described base stations controls transmission and reception of data using one terminal's maximum maximum bit rate information.

Thereafter, the second base station may transmit downlink control information to the terminal (S430). The second base station may control data transmission and reception of the terminal by transmitting downlink control information to which the total maximum bit rate information of the second base station terminal is applied to the terminal. That is, in order to control the uplink data transmission rate of the terminal, the uplink grant information included in the downlink control information is generated using the total maximum bit rate information of the second base station terminal set for the second base station to control the data transmission of the terminal can do. Similarly, in order to control the downlink data transmission rate of the terminal, the downlink allocation information included in the downlink control information is generated using the total maximum bit rate information of the second base station terminal set for the second base station, thereby controlling the data reception of the terminal. can do.

As described above, according to an embodiment of the present invention, the second base station may solve the above-described problem by receiving the total maximum bit rate information of the second base station terminal applied to the second base station and generating downlink control information. In addition, in the case of the first base station, the same problem can be solved by generating or receiving the total maximum bit rate information of the first base station terminal.

A detailed method of setting or determining the total maximum bit rate information of the first base station terminal and the total maximum bit rate information of the second base station terminal will be described in detail by dividing each embodiment below.

5 is a flowchart illustrating the operation of a second base station according to another embodiment of the present invention.

The second base station according to another embodiment of the present invention may further include transmitting reference information for determining or changing the total maximum bit rate information of the second base station terminal to the first base station.

Referring to FIG. 5, the second base station may include a step in which the first base station transmits reference information for determining or changing the total maximum bit rate information of the second base station terminal to the first base station (S510 ). For example, the second base station requests to change the total maximum bit rate information of the second base station terminal previously received from the first base station, or to propose adjustment of the total maximum bit rate information of the second base station terminal determined by the second base station. Information can be transmitted.

For example, the reference information may include the total maximum bit rate proposal information of the second base station terminal determined by the second base station. The second base station may determine the total maximum bit rate information of the terminal by considering the channel quality of the serving cell provided by the second base station or the second base station load. In this case, the second base station may transmit reference information including proposal information suggesting the total maximum bit rate of the second base station terminal determined as the first base station.

As another example, the reference information may include data bit rate information transmitted and received through the second base station. The data bit rate transmitted and received through the second base station includes bit rate information of data transmitted from the terminal to the second base station (that is, data bit rate information received from the terminal by the second base station) and bit rate information of data transmitted from the second base station to the terminal. (That is, data bit rate information that the second base station receives through the network and transmits to the terminal).

As another example, the reference information may further include request information or indication information for requesting the total maximum bit rate information of the second base station terminal. That is, when the second base station needs to adjust the total maximum bit rate information of the second base station terminal, it may include information requesting it to the first base station.

When receiving the reference information from the second base station, the first base station may determine the total maximum bit rate information of the second base station terminal using the reference information. Specifically, the first base station may determine the maximum bit rate of the terminal of the second base station based on the total maximum bit rate information of the second base station terminal proposed by the second base station. Alternatively, the first base station may determine the maximum maximum bit rate information of the second base station terminal by referring to data bit rate information transmitted and received through the second base station transmitted by the second base station.

When the first base station configures a dual connection and determines the total maximum bit rate information of the second base station terminal as the second base station, the first base station may determine the reference information. Alternatively, when the reference information is received from the second base station, the first base station may change the total maximum bit rate of the second base station terminal that is previously determined or previously determined and transmitted to the second base station using the reference information. In this case, the maximum maximum bit rate information of the second base station terminal of the second base station can be changed based on the reference information.

Thereafter, the second base station may receive the maximum maximum bit rate information of the second base station terminal from the first base station (S520). The total maximum bit rate information of the second base station terminal is information determined by reference information or changed by a reference signal.

As described with reference to FIG. 4, the second base station generates downlink control information using the total maximum bit rate information of the received second base station terminal (S530). In addition, the second base station may control the data transmission bit rate of the terminal by transmitting the generated downlink control information to the terminal (S540). Steps S530 and S540 are the same as described with reference to FIG. 4.

As described above, the second base station terminal maximum bit rate information is determined based on the terminal maximum maximum bit rate information and reference information, and may include information for limiting data transmitted or received by the second base station to the terminal. For example, assuming that the maximum total bit rate of the terminal is 100 as in the prior art, the first base station may determine the total maximum bit rate of the second base station terminal as 70 by referring to the reference information. As another example, when the reference information is not received, the first base station may determine the total maximum bit rate of the second base station terminal using a preset ratio or the like. The first base station and the second base station may control the bit rate of the transmission/reception data of the terminal based on the total maximum bit rate information of the terminal of each base station determined as described above.

The operation of the terminal in connection with the operation of the present invention described above will be described with reference to FIG. 6.

6 is a flowchart illustrating a terminal operation according to another embodiment of the present invention.

A terminal according to another embodiment of the present invention, in a method for transmitting and receiving data, configuring dual connectivity with a first base station and a second base station and uplink grant information and downlink allocation from the second base station The method includes receiving downlink control information including at least one of information and transmitting and receiving data with a second base station based on the downlink control information, wherein the downlink control information is the maximum maximum bit rate of the second base station terminal. It provides a method that is determined based on information.

Referring to FIG. 6, the terminal includes configuring dual connectivity with the first base station and the second base station (S610). For example, the terminal may configure a bearer as shown in FIG. 1 or 2 described above to configure a dual connection with a plurality of base stations. By configuring a dual connection, a terminal can transmit and receive data through all of a plurality of base stations. Alternatively, the terminal may receive downlink data through all of the plurality of base stations, or may transmit the uplink data through all of the plurality of base stations or only one of the base stations.

The terminal may include receiving downlink control information including at least one of uplink grant information and downlink allocation information from the second base station (S620). As described with reference to FIGS. 4 and 5, downlink control information may be determined based on the total maximum bit rate information of the second base station terminal. Also, the downlink control information may include one or more of uplink grant information and downlink allocation information for uplink data transmission.

In addition, the maximum maximum bit rate information of the second base station terminal may be determined based on the maximum maximum bit rate information of the terminal and reference information transmitted by the second base station to the first base station. As described above, the total maximum bit rate information of the second base station terminal may be determined based on the existing maximum total bit rate information of the terminal, and if necessary, reference information transmitted from the second base station to the first base station may be further used.

Here, the reference information may include the total maximum bit rate proposal information of the second base station terminal determined by the second base station. Alternatively, the reference information may include data bit rate information transmitted or received through the second base station. Alternatively, the reference information may further include change request information for requesting the second base station to change the total maximum bit rate information of the second base station terminal or request information for requesting the total maximum bit rate information for the second base station terminal.

The terminal includes transmitting and receiving data with the second base station based on the received downlink control information (S630). For example, when the terminal transmits data to the second base station, data may be transmitted based on the uplink grant of the downlink control information. Alternatively, when the terminal receives data from the second base station, it may receive data based on downlink allocation information.

In addition to this, the terminal may additionally perform steps necessary to perform the present invention.

As described above, according to the present invention, in a situation in which a dual connection is configured, the second base station can control data transmission and reception of the terminal by using the total maximum bit rate information of the second base station terminal. In this case, the second base station may transmit a reference signal to help determine the total maximum bit rate information of the second base station terminal to the first base station. The reference signal may include total bit rate proposal information of the second base station terminal proposed by the second base station or data bit rate information transmitted and received through the second base station.

Hereinafter, a description will be given focusing on each embodiment in a method of determining each of the maximum maximum bit rate information of the first base station terminal and the maximum maximum bit rate information of the second base station terminal. In describing each embodiment, the above-described first base station is described as MeNB, the second base station is described as SeNB, and the terminal maximum maximum bit rate information is described as UE-AMBR. In addition, the maximum maximum bit rate information of the first base station terminal is described as MeNB UE-AMBR, and the maximum maximum bit rate information of the second base station terminal is described as SeNB UE-AMBR. This is for understanding the sentence and is not limited to the term.

1st Example . UE - AMBR Additional enforcement methods.

The MeNB may transfer the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context or stored in the terminal context) to the SeNB in the second base station addition/modification process (eg, step S310 of FIG. 3 ). have.

As an example, when the MeNB wants to configure the SCG radio bearer through the SeNB or to configure the MCG-SCG radio bearer (separate radio bearer), it is provided from the MME (or provided from the MME and stored in the terminal context or the terminal contact) The UE-AMBR value (stored in the ST) may be transmitted to the SeNB as it is. In this case, the MeNB and the SeNB each limit the total maximum bit rate of the terminal based on the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context provided from the MME), so that the terminal moves up and down the UE-AMBR It has the disadvantage that it can transmit twice as much data as.

To compensate for this, as described above, when a dual connection is configured through an SCG radio bearer, the total maximum bit rate of the UE is limited based on UE-AMBR in a core network entity (eg, S-GW or PDN GW). You can do it. For example, in step S355 of FIG. 3, if the MeNB delivers the E-RAB Modification Indication according to the SCG dual connection configuration (or includes information indicating the SCG dual connection configuration) to the MME, the MME in step S360 of FIG. 3 May transmit the UE-AMBR to S-GW (or MME to P-GW) to limit the total maximum bit rate of the UE. As described above, when a dual connection is configured through the SCG radio bearer and the core network entity limits UE-AMBR, when the dual connection is released, the MeNB indicates the SCG dual connection deconfiguration (or SCG dual connection release) through the MME. If the E-RAB Modification Indication (including the information to be transmitted) is transmitted, the MME may release the UE-AMBR to the S-GW (or the MME to the P-GW).

When a dual connection is configured through the MCG-SCG radio bearer (separated bearer), the MeNB is exceeded based on UE-AMBR provided from the MME at the MAC layer (or provided from the MME and stored in the terminal context or stored in the terminal context) Traffic provided to the S-GW (uplink) or delivered from the S-GW (downlink) in addition to controlling traffic to be provided from the MME (or provided from the MME and stored in the terminal context or terminal context) It is possible to control excess traffic based on UE-AMBR). That is, each base station can control the transmission and reception data traffic of the terminal in the MAC layer, and can control the excess traffic of the terminal additionally in the upper layer. For example, the MCG-SCG radio bearer configured as shown in FIG. 2 is transmitted to the S-GW through the MeNB in the PDCP upper layer. Therefore, when the MeNB add/modify SeNB including the MCG-SCG radio bearer is completed (for example, after S340 in FIG. 3 or after S350 in FIG. 3), the MeNB is additionally based on the UE-AMBR or higher than the PDCP layer. It is possible to control the traffic above and below the layer.

If a dual connection is configured through the MCG-SCG radio bearer (separated bearer) and the MeNB additionally limits traffic exceeding the UE-AMBR at the PDCP layer or at the PDCP higher layer, the MeNB can release it when the dual connection is released. have. For example, if the MeNB decides to release the SeNB resource (or after the MeNB sends a release request to the SeNB, or after the MeNB receives a SeNB release response from the SeNB, or the MeNB sends an RRC Connection Reconfiguration message to the UE including the SeNB release configuration) After sending, or after the MeNB receives the RRC Connection Reconfiguration Complete message), the MeNB is provided by the MME at the PDCP layer or at the PDCP upper layer (or provided by the MME and stored in the terminal context or stored in the terminal context) UE-AMBR Based on the can be released the function to limit the total maximum bit rate of the terminal.

In other words, the total maximum bit rate of the UE is limited by the MeNB, and may be additionally limited by the PDCP layer or higher layers.

Through this, it is possible to solve the above-described problem even in a situation in which a dual connection is configured as shown in FIG. 2.

2nd Example . MeNB Limit per base station UE - AMBR Determine the value.

The MeNB is based on the UE-AMBR provided by the MME (or stored in the terminal context or stored in the terminal context or stored in the terminal context) in the second base station addition/modification process (for example, S310 in FIG. 3). The UE-AMBR value to be executed may be determined and the SeNB UE-AMBR value to be executed by the SeNB may be transmitted to the SeNB.

For example, when the MeNB wants to configure the SCG radio bearer through the SeNB or the MCG-SCG radio bearer, the UE provided from the MME (or provided from the MME and stored in the UE context or stored in the UE context) -The AMBR value and the UE-AMBR ratio (ratio or factor) to be executed by the SeNB may be transmitted to the SeNB.

As another example, when the MeNB wants to configure the SCG radio bearer through the SeNB or the MCG-SCG radio bearer, the UE provided from the MME (or provided from the MME and stored in the UE context or stored in the UE context) The MeNB may determine and transmit the SeNB UE-AMBR value to be executed by the SeNB based on the AMBR value to the SeNB.

When applying the above methods, the sum of the MeNB UE-AMBR to be executed by the MeNB and the SeNB UE-AMBR to be executed by the SeNB is provided from the MME (or provided from the MME and stored in the terminal context or stored in the terminal context). -Can be set not to exceed AMBR. Therefore, it is possible to ensure that the uplink UE-AMBR and the downlink UE-AMBR are not exceeded.

However, since each base station limits the total bit rate of the UE only within a certain ratio of the UE-AMBR provided from the MME (or stored in the UE context or stored in the UE context), the radio channel or load of each base station There is a disadvantage that the optimized scheduling cannot be performed in consideration of the state and the like. For example, MeNB and SeNB respectively limit the total bit rate of the UE based on the transmission rate of 50% to 50% of the UE-AMBR provided from the MME (or provided from the MME and stored in the terminal context or stored in the terminal context). This may happen. In this case, if the radio channel state of the MeNB is bad or the load is high, the MeNB cannot allocate a scheduling grant, and if only a Securing grant is allocated through the SeNB, the UE can transmit data only at a 50% bit rate of the UE-AMBR.

In order to compensate for the occurrence of such a problem, one base station may instruct or request to change the UE-AMBR value to another base station. For example, the MeNB may indicate or request a change of the UE-AMBR value to the SeNB. Conversely, the SeNB may indicate or request a change of the UE-AMBR value to the MeNB.

Specifically, the MeNB is a UE-AMBR ratio (ratio/factor) to be changed and enforced by the SeNB in consideration of a radio channel of the MeNB (or MeNB and SeNB) and/or a load state of the MeNB, or a SeNB UE-AMBR value to be executed by the SeNB. Can be delivered to SeNB. The SeNB may adjust the SeNB UE-AMBR value to be executed by the SeNB in consideration of this. The MeNB may send a UE-AMBR ratio to be enforced by changing to SeNB (ratio/factor) or a SeNB UE-AMBR value to be enforced by SeNB and/or a cause value therefor. Alternatively, the MeNB may receive a response message from the SeNB to SeNB UE-AMBR value adjustment to be executed in the SeNB, and may adjust the MeNB UE-AMBR value to be executed in the MeNB.

Conversely, the SeNB considers the radio channel of the SeNB and/or the load state of the SeNB, etc., and the UE-AMBR ratio (ratio/factor) that the SeNB wants to change and enforce or the SeNB UE-AMBR value to be enforced by the SeNB and/or the same. Cause value can be transferred to MeNB. The MeNB may adjust the MeNB UE-AMBR value to be executed by the MeNB in consideration of this.

Alternatively, the SeNB may transmit the total maximum bit rate (uplink/downlink) of the terminal transmitted through the SeNB or the total bit rate of the terminal to the MeNB, which the MeNB may be used to determine or change the SeNB UE-AMBR value. . The bit rate in the present specification may mean a bit rate.

Or, the SeNB periodically or if the preset condition is satisfied, the MeNB may be used to determine or change the SeNB UE-AMBR value, the maximum maximum bit rate (uplink/downlink) information of the terminal transmitted through the SeNB. Alternatively, the total bit rate information of the terminal or the SeNB UE-AMBR value to be executed by the SeNB may be transmitted to the MeNB. If necessary, the cause value of the change or decision can be transmitted to the MeNB. Specifically, the preset condition that the SeNB transmits to the MeNB is when the total maximum bit rate of the terminal transmitted through the SeNB exceeds a certain value, or when the UE-AMBR is reached (exceeded) or the radio channel or load is specified. This may be the case when the state has been reached.

To this end, the MeNB adds/modifies a second base station to a predetermined condition (for example, a period or a maximum maximum bit rate value of a terminal that will trigger a report) for the SeNB to transmit or report to the MeNB (eg, in FIG. 3) S310). Alternatively, the preset condition may be set in advance as operations, administration and maintenance (OAM).

For another example, the MeNB may receive the response by requesting the total maximum bit rate (uplink/downlink) of the UE transmitted through the SeNB to the SeNB by the MeNB to determine or change the SeNB UE-AMBR value.

The total maximum bit rate or total bit rate of the terminal transmitted through the SeNB described above is the total maximum bit rate or the total bit rate or the average bit rate or throughput of the terminal transmitted through the SeNB during a time during which a dual connection is configured (or in the last predetermined time). (throughput). That is, it may be bit rate information of uplink data transmitted by the terminal to the second base station, and bit rate information of downlink data received by the terminal from the second base station. As another example, the total maximum bit rate or total bit rate of the terminal transmitted through the SeNB described above may be scheduled IP throughput specified in 4.1.6 or 4.1.7 of 3GPP TS document 36.314. The purpose of this measure is to measure IP throughput over Uu regardless of traffic pattern and packet size.

Third embodiment . Determining the average UE - AMBR value to limit and the scheduling allowance ratio .

As in the second embodiment, the MeNB is provided by the MME in the second base station addition/modification process (for example, S310 in FIG. 3) (or provided from the MME and stored in the terminal context or stored in the terminal context) UE-AMBR Based on the, it is possible to determine the UE-AMBR value to be executed by the MeNB and the SeNB, and transmit the SeNB UE-AMBR value to the SeNB.

As described above, the sum of the MeNB UE-AMBR to be executed in the MeNB and the SeNB UE-AMBR to be executed in the SeNB does not exceed the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context). If not, it can be ensured that the uplink UE-AMBR and the downlink UE-AMBR are not exceeded. However, since each base station limits the total maximum bit rate of the UE only within a certain ratio of UE-AMBR provided from the MME (or stored in the UE context or stored in the UE context), the radio channel of each base station or There is a drawback that it is not possible to perform optimized scheduling in consideration of load conditions. To compensate for this, the MeNB (or MeNB and SeNB) are provided from the MME (or provided from the MME and stored in the terminal context or stored in the terminal context) within the range of UE-AMBR values, the average to be performed by each base station. It is possible to determine the allowable rate for scheduling not exceeding the average UE-AMBR to be executed by the UE-AMBR and each base station.

For example, the total bit rate of the UE based on an average transmission rate of 40% to 60% of the UE-AMBR provided by the MeNB and the SeNB respectively (or provided from the MME and stored in the terminal context or stored in the terminal context), respectively. Assume when you want to limit. In this case, the allowable rate for scheduling not exceeding the average MeNB UE-AMBR to be executed by the MeNB is 90%, and the allowable rate for scheduling not exceeding the average SeNB UE-AMBR to be executed by the SeNB is 90%. For example. In this example, the allowable rate for scheduling not exceeding the average MeNB UE-AMBR to be executed by the MeNB and the allowable rate for scheduling not exceeding the average SeNB UE-AMBR to be executed by the SeNB are illustrated with the same value, but the two values are It can be a different value.

If the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context provided by the MME) is 1,000,000 (bit/s or bps), the MeNB 400,000 the average MeNB UE-AMBR to be executed in the MeNB. , The average SeNB UE-AMBR to be executed by SeNB can be determined to be 600,000. In addition, the MeNB has an allowance rate for scheduling not exceeding the average MeNB UE-AMBR (400,000) to be executed by the MeNB, so 90% of the scheduling grant within the average MeNB UE-AMBR (400,000) to be executed by the MeNB Allow scheduling. Meanwhile, scheduling may not be allowed at a rate of 10% (100%-90%) for a scheduling grant within the average MeNB UE-AMBR (400,000) to be executed by the MeNB. For example, the scheduling decision may be postponed to the next scheduling cycle, the scheduling grant may be restricted, or traffic may be restricted. 10% for scheduling grants up to the UE-AMBR (1,000,000) provided from the MME (or stored in the terminal context or stored in the terminal context) exceeding the average MeNB UE-AMBR (400,000) to be enforced in the MeNB. Allows scheduling at a rate of 1. 90% for scheduling grants up to the UE-AMBR (1,000,000) provided from the MME (or stored in the terminal context or stored in the terminal context) exceeding the average MeNB UE-AMBR (400,000) to be enforced in the MeNB. Percentage may not allow scheduling. For example, the scheduling decision may be postponed to the next scheduling cycle, the scheduling grant may be restricted, or traffic may be restricted.

In this case, the MeNB can limit the total maximum bit rate of the UE to MeNB UE-AMBR 400,000 on average.

If the same method is applied, the SeNB can limit the total maximum bit rate of the UE to SeNB UE-AMBR 600,000 on average.

Accordingly, the MeNB and SeNB, on average, limit the total maximum bit rate of the UE based on the UE-AMBR provided from the MME (or provided from the MME and stored in the terminal context or stored in the terminal context), while each base station receives from the MME. It may have an opportunity to schedule up to the UE-AMBR provided (or stored from the MME and stored in the terminal context or stored in the terminal context).

On the other hand, the MeNB is used for scheduling not exceeding the (average) UE-AMBR ratio to be enforced in the SeNB (ratio/factor) or the (average) SeNB UE-AMBR value to be enforced in the SeNB and/or the average SeNB UE-AMBR to be enforced in the SeNB. The allowable rate for the can be delivered to the SeNB.

Alternatively, the MeNB may transmit information for indicating the scheduling to the SeNB in consideration of an allowance rate for scheduling not exceeding the average SeNB UE-AMBR to be executed by the SeNB.

Alternatively, the SeNB may determine an allowable rate for scheduling not exceeding the average SeNB UE-AMBR to be executed by the SeNB.

4th Example . SeNB Excess allowed UE - AMBR Value provided.

As in the second embodiment, the MeNB is provided by the MME in the second base station addition/modification process (for example, S310 in FIG. 3) (or provided from the MME and stored in the terminal context or stored in the terminal context) UE-AMBR The UE-AMBR value to be executed by the MeNB and the SeNB may be determined based on the result, and the SeNB UE-AMBR value to be executed by the SeNB may be transmitted to the SeNB.

As described above, the sum of the MeNB UE-AMBR to be executed in the MeNB and the SeNB UE-AMBR to be executed in the SeNB does not exceed the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context). If not, it can be ensured that the uplink UE-AMBR and the downlink UE-AMBR are not exceeded. However, since each base station limits the total bit rate of the UE only within a certain ratio of the UE-AMBR provided from the MME (or stored in the UE context or stored in the UE context), the radio channel or load of each base station There is a disadvantage that the optimized scheduling cannot be performed in consideration of the state and the like. To compensate for this, the MeNB (or MeNB and SeNB) provides the MeNB UE-AMBR to be enforced by the MeNB and the SeNB UE-AMBR value to be enforced by the SeNB from the MME (or is provided from the MME and stored in the terminal context or the terminal context). (Stored in) may exceed the range of the UE-AMBR value.

The MeNB (or MeNB and SeNB) is provided from the MME (or is provided from the MME and stored in the terminal context or stored in the terminal context) exceeds the range of UE-AMBR values, each UE to be enforced by the MeNB and the SeNB- The AMBR value can be determined. Or UE-AMBR to be executed by each base station that exceeds a range of UE-AMBR values provided by the MME (or stored in the UE context or stored in the UE context) (SeNB UE-AMBR and MeNB UE-AMBR) The excess allowable value (or ratio) can be determined.

Specifically, for example, the SeNB is intended to limit the total bit rate of the UE based on a transmission rate of 60% of the UE-AMBR provided from the MME (or stored in the UE context or stored in the UE context) from the MME, If the MeNB and SeNB are allowed to exceed 20% of the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context, respectively), the MeNB is provided from the MME to the SeNB. It may instruct to limit the total bit rate of the terminal based on the transmission rate of 80% (60% + 20%) of the UE-AMBR (or stored in the terminal context or stored in the terminal context provided by the MME).

The MeNB may cause an indication or report to the MeNB when the SeNB reaches the terminal total bit rate of 60% of the UE-AMBR provided from the MME (or stored in the terminal context or stored in the terminal context) from the MME. It might be.

The MeNB may deliver a UE-AMBR ratio (ratio/factor) to be enforced in SeNB or a SeNB UE-AMBR value to be enforced in SeNB and/or a SeNB UE-AMBR excess value (or ratio) to be enforced in SeNB to SeNB.

Each of the above-described first to fourth embodiments may be applied independently or may be applied in combination with each other.

Article 5 Example . E- RAB According to the change UE - AMBR change.

The network may change the E-RAB or E-RAB parameter value by network initiated or UE initiated signaling.

For example, when a terminal in an RRC connected state is configured with a dual connection, a new APN may be added to the terminal. In this case, the UE-AMBR may be updated and transmitted to the MeNB according to the addition of a new APN. The MeNB may update the UE-AMBR to be executed by the MeNB or the MeNB and the SeNB according to the method of the present invention described above based on the updated UE-AMBR.

For example, if the E-RAB setup request message (E-RAB SETUP REQUEST message) or E-RAB modification request message (E-RAB MODIFY REQUEST message) includes UE-AMBR information, the MeNB is previously provided in the context in the terminal. UE-AMBR may be updated (replace/update) with the received UE-AMBR. The MeNB uses the UE-AMBR received for non-GBR bearers for the associated terminal. The MeNB may update the MeNB UE-AMBR and/or SeNB UE-AMBR based on the method for changing or determining the total maximum bit rate of the second base station terminal of the present invention based on the updated UE-AMBR.

Based on the method for changing or determining the total maximum bit rate of the second base station terminal of the present invention described above, the UE-AMBR value (or ratio) to be executed for each base station is provided from the MME (or provided from the MME and stored in the terminal context or the terminal contact) May be stored as another information element distinct from the UE-AMBR. For example, the MeNB (or MeNB and SeNB) has two information elements in the terminal context, or the terminal context is provided from the MME (or provided from the MME and stored in the terminal context or stored in the terminal context) as in the terminal context. It contains only the UE-AMBR information element (stored), and the MeNB (or MeNB and SeNB) may separately store the MeNB UE-AMBR value (or ratio) that the MeNB (or MeNB and SeNB) will actually enforce.

In another method, based on the method of the present invention described above, the MeNB UE-AMBR value to be executed by the MeNB is distinguished from the UE-AMBR provided from the MME (or provided from the MME and stored in the terminal context or stored in the terminal context). It can be updated using other information elements. For example, the MeNB has two information elements in the terminal context, or the UE-AMBR information element provided in the MME as conventionally provided in the terminal context (or stored in the terminal context or stored in the terminal context). Only included, the MeNB may separately store the MeNB UE-AMBR value (or ratio) to be actually executed by the MeNB. The SeNB may store the SeNB UE-AMBR value (or ratio) to be executed by the SeNB as a SeNB terminal contact.

Based on the method of the present invention described in another method, the MeNB UE-AMBR value to be executed by the MeNB is a UE-AMBR information element provided from an MME (or provided from the MME and stored in a terminal context or stored in a terminal context). Can be updated using. In addition, the UE-AMBR information element provided from the MME (or stored in the terminal context or stored in the terminal context) may be separately managed before the dual connection configuration.

7 is a diagram illustrating an example of a Bearer Modification Procedure with Bearer QoS Update.

7 shows an example of a bearer modification procedure. UE requested bearer resource modification procedure by UE request also uses S705 to S750 shown in FIG. 7.

Referring to FIG. 7, the PCRF (Policy and Charging Rules Function, 705) may request to modify the IP-CAN session to the PDN GW 704 (S700). The PDN-GW 704 requests a bearer update to the Serving GW 703 (S705). The serving gateway 703 requests a bearer update to the MME 702 (S710). The MME 702 delivers the bearer modification request/session management request to the eNodeB 701 (S715). The eNodeB 701 may transmit bearer update information by sending an RRC connection reconfiguration message to the terminal 700 (S720). The terminal 700 configures bearer update information and transmits an RRC connection reconfiguration completion message to the eNodeB 701 (S725). When the eNodeB 701 receives the RRC connection reconfiguration message from the terminal 700, it transmits a response to the bearer modification to the MME 702 (S730). In addition, the terminal 700 may transfer Direct Transfer to the eNodeB 701 (S735). The eNodeB 701 receives a Direct Transfer from the terminal 700 and transmits a response to session management to the MME 702 (S740). The MME 702 delivers a response to the bearer update to the serving gateway 703 (S745). The serving gateway 703 delivers a response to the bearer update to the PDN-GW 704 (S750). The PDN-GW 704 forwards the IP-CAN session modification to the PCRF 705 (S755).

The bearer modification procedure has been briefly described above.

On the other hand, when performing a bearer modification procedure by network initiation or by a terminal request, if the APN-AMBR is changed in step S715, the MME 702 updates the UE-AMBR. The MME 702 sends a bearer modification request message to the base station 701. The bearer modification request message includes EPS Bearer Identity, EPS Bearer QoS, Session Management Request, and UE-AMBR information.

If a dual connection is configured to the terminal 700, if a bearer modification request message is received from the MME 702, the MeNB is based on the updated UE-AMBR according to the AMBR change or determination method of each base station of the present invention. The UE-AMBR to be executed by the MeNB or the MeNB and SeNB may be updated.

As described above, the present invention effectively limits the total maximum bit rate of a terminal configured to use radio resources provided by two different base stations, a first base station (MeNB) and a second base station (SeNB) connected by non-ideal backhaul. There is an effect that can be done.

In addition, according to the present invention, when the terminal configures a dual connection with a plurality of base stations, there is an effect of effectively controlling the total maximum bit rate of the terminal. In addition, according to the present invention, when the total maximum bit rate of the terminal is applied to a plurality of base stations overlapping, there is an effect of solving the problem that the data transmission/reception limit capacity of the terminal increases substantially. In addition, according to the present invention, any base station among a plurality of base stations constituting a dual connection with a terminal has an effect of performing more efficient terminal data transmission/reception control by changing/adjusting the total maximum bit rate according to the channel state or load of the base station.

The configurations of the base station and the terminal performing all the methods of the present invention described with reference to FIGS. 1 to 7 will be described with reference to FIGS. 8 and 9, respectively.

8 is a block diagram showing the configuration of a base station (second base station) according to another embodiment of the present invention.

Referring to FIG. 8, the base station 800 according to another embodiment of the present invention includes a control unit 810, a transmission unit 820, and a reception unit 830.

Specifically, the second base station 800 for transmitting and receiving data according to the present invention, the receiving unit 830 and the second base station terminal for receiving the total maximum bit rate information of the second base station terminal from the first base station constituting a dual connection to the terminal It may include a control unit 810 for generating downlink control information based on the total maximum bit rate information and a transmitter 820 for transmitting downlink control information to the terminal. The downlink control information may include at least one of uplink grant information and downlink allocation information.

The transmitter 820 may transmit reference information for determining or changing the total maximum bit rate information of the second base station terminal to the first base station. For example, the reference information may include the total maximum bit rate proposal information of the second base station terminal determined by the second base station. The second base station may determine the total maximum bit rate information of the terminal by considering the channel quality of the serving cell provided by the second base station or the second base station load. In this case, the second base station may transmit reference information including proposal information suggesting the total maximum bit rate of the second base station terminal determined as the first base station. As another example, the reference information may include data bit rate information transmitted and received through the second base station. The data bit rate transmitted and received through the second base station may include one or more of bit rate information of data transmitted by the terminal to the second base station and bit rate information of data transmitted by the second base station to the terminal. As another example, the reference information may further include request information or indication information for requesting the total maximum bit rate information of the second base station terminal. That is, when the second base station needs the total maximum bit rate information of the second base station terminal, it may include information requesting it from the first base station.

The control unit 810 is divided from the existing maximum terminal bit rate required to perform the above-described present invention and applied to the second base station terminal maximum bit rate applied to the second base station. 2 Control the operation of the base station 800.

The transmitting unit 820 and the receiving unit 830 are used to transmit and receive signals, messages, and data necessary to perform the present invention as described above with a terminal or a first base station.

9 is a block diagram showing the configuration of a user terminal according to another embodiment of the present invention.

Referring to FIG. 9, the user terminal 900 according to another embodiment of the present invention includes a receiver 910, a controller 920, and a transmitter 930.

Specifically, the terminal 900 for transmitting/receiving data according to the present invention includes uplink grant information and downlink from the control unit 920 and the second base station configuring dual connectivity with the first base station and the second base station. The receiving unit 910 receives downlink control information including at least one of allocation information and receives data from the second base station based on the downlink control information, and the second base station based on the downlink control information. It may include a transmitter 930 for transmitting data. The downlink control information may be determined based on the total maximum bit rate information of the second base station terminal.

In addition, the maximum maximum bit rate information of the second base station terminal may be determined based on the maximum maximum bit rate information of the terminal and reference information transmitted by the second base station to the first base station. For example, the reference information may include the total maximum bit rate proposal information of the second base station terminal determined by the second base station. The second base station may determine the total maximum bit rate information of the terminal by considering the channel quality of the serving cell provided by the second base station or the second base station load. In this case, the second base station may transmit reference information including proposal information suggesting the total maximum bit rate of the second base station terminal determined as the first base station. As another example, the reference information may include data bit rate information transmitted and received through the second base station. The data bit rate transmitted and received through the second base station may include one or more of bit rate information of data transmitted by the terminal to the second base station and bit rate information of data transmitted by the second base station to the terminal. As another example, the reference information may further include request information or indication information for requesting the total maximum bit rate information of the second base station terminal. That is, when the second base station needs the total maximum bit rate information of the second base station terminal, it may include information requesting it from the first base station.

The receiving unit 910 receives downlink control information, data, and messages from a base station through a corresponding channel.

In addition, the control unit 920 configures a dual connection with a plurality of base stations necessary to perform the above-described present invention, and controls the operation of the overall terminal 900 according to transmitting and receiving data based on downlink control information. .

The transmitter 930 transmits uplink control information, data, and messages to a plurality of base stations through a corresponding channel.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain them, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

Claims (18)

In the method of the second base station to transmit and receive data,
Receiving total maximum bit rate information of a second base station terminal from a first base station constituting a dual connection to the terminal;
Generating downlink control information including at least one of uplink grant information and downlink allocation information based on the total maximum bit rate information of the second base station terminal; And
And transmitting the downlink control information to the terminal,
The total maximum bit rate information of the second base station terminal,
The second base station includes information for limiting data transmitted or received by the terminal,
The MAC layer of the second base station,
Control the excess data traffic received from the terminal based on the total maximum bit rate information of the second base station terminal,
The PDCP layer of the second base station,
A method of controlling excess data traffic transmitted from the terminal based on the total maximum bit rate information of the second base station terminal. delete delete delete delete In the method for the terminal to transmit and receive data,
Configuring dual connectivity with the first base station and the second base station;
Receiving downlink control information including at least one of uplink grant information and downlink allocation information from the second base station; And
And transmitting and receiving data to and from the second base station based on the downlink control information.
The downlink control information is determined based on the total maximum bit rate information of the second base station terminal,
The total maximum bit rate information of the second base station terminal,
The first base station in which the terminal configures a dual connection transmits to the second base station, and includes information for limiting data transmitted or received by the second base station to the terminal.
The MAC layer of the second base station,
Control the excess data traffic received from the terminal based on the total maximum bit rate information of the second base station terminal,
The PDCP layer of the second base station,
A method of controlling excess data traffic transmitted from the terminal based on the total maximum bit rate information of the second base station terminal. delete delete delete In the second base station for transmitting and receiving data,
A receiving unit for receiving the maximum maximum bit rate information of the second base station terminal from the first base station constituting a dual connection to the terminal;
A control unit generating downlink control information including at least one of uplink grant information and downlink allocation information based on the total maximum bit rate information of the second base station terminal; And
It includes a transmitter for transmitting the downlink control information to the terminal,
The total maximum bit rate information of the second base station terminal,
The second base station includes information for limiting data transmitted or received by the terminal,
The MAC layer of the second base station,
Control the excess data traffic received from the terminal based on the total maximum bit rate information of the second base station terminal,
The PDCP layer of the second base station,
A second base station that controls excess data traffic transmitted from the terminal based on the total maximum bit rate information of the second base station terminal. delete delete delete delete In the terminal for transmitting and receiving data,
A control unit configuring dual connectivity with the first base station and the second base station;
A receiving unit receiving downlink control information including at least one of uplink grant information and downlink allocation information from the second base station, and receiving data from the second base station based on the downlink control information; And
It includes a transmitter for transmitting data to the second base station based on the downlink control information,
The downlink control information is determined based on the total maximum bit rate information of the second base station terminal,
The total maximum bit rate information of the second base station terminal,
The first base station in which the terminal configures a dual connection transmits to the second base station, and includes information for limiting data transmitted or received by the second base station to the terminal.
The MAC layer of the second base station,
Control the excess data traffic received from the terminal based on the total maximum bit rate information of the second base station terminal,
The PDCP layer of the second base station,
A terminal that controls excess data traffic transmitted from the terminal based on the total maximum bit rate information of the second base station terminal. delete delete delete

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