WO2014126356A1

WO2014126356A1 - Method for activating or deactivating small cell and apparatus therefor

Info

Publication number: WO2014126356A1
Application number: PCT/KR2014/000996
Authority: WO
Inventors: 홍성표
Original assignee: 주식회사 케이티
Priority date: 2013-02-13
Filing date: 2014-02-05
Publication date: 2014-08-21

Abstract

The present invention relates to a method for activating or deactivating a cell associated with a second base station added to a terminal as a secondary cell, and an apparatus therefor. More specifically, a method for enabling a terminal to activate or deactivate a cell associated with a second base station includes the steps of: receiving an upper layer signaling through a first base station after a signaling between the first and the second base station; activating a particular cell associated with the second base station; and constructing a radio bearer through the second base station.

Description

Small cell activation or deactivation method and apparatus thereof

The present invention relates to a method of activating or deactivating a small cell associated with a second base station added as a secondary cell to a terminal.

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals.

Currently, mobile communication systems such as Long Term Evolution (LTE) and LTE-Advanced of the 3GPP series require high-speed large-capacity communication systems capable of transmitting and receiving various data such as video and wireless data, beyond voice-oriented services.

For such a high-speed large-capacity communication system, a technology for increasing the capacity of a terminal by using a small cell is required.

In addition, in an environment in which a macro cell base station is connected to a small cell base station by a non-ideal backhaul, it is required to add a radio bearer through the small cell and the small cell base station in order for the terminal to transmit user plane data through the small cell.

That is, when the base station providing the macro cell and the base station providing the small cell are different from each other, a method for performing communication using the macro cell and the small cell is required.

In addition, in performing data communication using the added small cell, a method for controlling the terminal to activate or deactivate the added small cell is required according to data traffic and power conditions.

According to the above-described request, the present invention proposes a method and apparatus for adding a small cell associated with a base station distinguished from a macro cell base station as a secondary cell and activating or deactivating the added small cell.

In addition, the present invention is to propose a method and apparatus for controlling the activation or deactivation of a small cell added to the terminal by the master base station providing a macro cell or a secondary base station providing a small cell according to data traffic and power conditions of the terminal. do.

According to an aspect of the present invention, a method for activating or deactivating a cell associated with a second base station, wherein the terminal receives higher layer signaling received through the first base station after signaling between the first base station and the second base station. And configuring the specific cell associated with the second base station to an activated state and configuring a radio bearer via the second base station.

The present invention also provides a method for activating or deactivating a cell associated with a second base station by a first base station, wherein after the signaling between the first base station and the second base station, the additional cell configuration information related to the second base station and the second base station radio bearer It provides a method comprising the step of transmitting a higher layer signaling including the additional configuration information to the terminal and receiving the activation or deactivation status information of the cell associated with the second base station.

In addition, the present invention provides a method for activating or deactivating a cell associated with a second base station by the second base station, the higher layer signaling to be transmitted to the terminal through the first base station in the signaling process between the first base station and the second base station; And transmitting activation related indication information to the terminal through the cell associated with the second base station, the activation related indication information including information for activating or deactivating a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station; And transmitting the activation or deactivation status information of the cell associated with the second base station to the first base station.

In addition, the present invention relates to a terminal for activating or deactivating a cell associated with a second base station, comprising: a receiver for receiving higher layer signaling received through the first base station after signaling between the first base station and the second base station; Provided is a terminal apparatus including a controller configured to configure a specific cell in an activated state and a controller configured to configure a radio bearer through a second base station.

In addition, the present invention provides a first base station for activating or deactivating a cell associated with a second base station, after the signaling between the first base station and the second base station, the additional cell configuration information associated with the second base station and the second base station radio bearer modification Provided is a base station apparatus including a control unit for generating higher layer signaling including configuration information, a transmitting unit for transmitting higher layer signaling to a terminal, and a receiving unit for receiving activation or deactivation state information of a cell associated with a second base station.

In addition, the present invention provides a second base station for activating or deactivating a cell associated with a second base station, the control unit for generating a higher layer signaling to be transmitted to the terminal through the first base station in the signaling process between the first base station and the second base station; A transmitter and a second base station for transmitting activation related indication information including information indicating to activate or deactivate a cell distinguished from a specific cell configured in an activated state among cells associated with a second base station through a cell associated with a second base station. It provides a base station apparatus including a transmitter for transmitting the activation or deactivation state information of the cell associated with the first base station.

According to the present invention, there is an effect of providing a method and apparatus for a terminal to add a small cell associated with a base station distinguished from a macro cell base station as a secondary cell, and to activate or deactivate the added small cell.

The present invention also provides a method and apparatus for controlling activation or deactivation of a small cell added to a terminal by a first base station providing a macro cell or a second base station providing a small cell, thereby reducing power consumption of the terminal. And it is effective to provide a small cell activation or deactivation method and apparatus for data traffic.

1 is a diagram illustrating an example of a network configuration scenario to which the present invention can be applied.

2 is a diagram illustrating an example of user data transmission through an interface between a first base station and a second base station to which the present invention can be applied.

3 is a diagram illustrating another example of user data transmission through an interface between a first base station and a second base station to which the present invention can be applied.

4 is a diagram illustrating a cell addition / modification procedure associated with a second base station to which the present invention can be applied.

5 is a diagram illustrating a procedure of activating / deactivating a cell associated with a second base station by a terminal according to an embodiment of the present invention.

6 is a diagram illustrating a procedure of activating / deactivating a cell associated with a second base station by a terminal according to another embodiment of the present invention.

7 is a diagram illustrating a procedure of activating / deactivating a cell associated with a second base station by a terminal according to another embodiment of the present invention.

8 is a diagram illustrating a procedure of activating a cell associated with a second base station by a terminal according to another embodiment of the present invention.

9 is a diagram illustrating a procedure for deactivating a small cell by a terminal according to another embodiment of the present invention.

FIG. 10 is a diagram illustrating an operation when a terminal receives uplink grant or downlink allocation information in a cell activation state associated with a second base station according to another embodiment of the present invention.

11 is a diagram illustrating an example MAC control element that may include activation-related indication information according to the present invention.

12 is a diagram illustrating a procedure for controlling activation / deactivation of a cell associated with a second base station by a first base station according to another embodiment of the present invention.

FIG. 13 illustrates a procedure of activating a cell associated with a second base station by a first base station according to another embodiment of the present invention.

14 is a diagram illustrating a cell activation procedure associated with a second base station, including the step of transmitting, by a first base station, an activation related preparation message according to another embodiment of the present invention.

15 is a diagram illustrating a cell activation procedure associated with a second base station including the step of transmitting activation state information by the first base station according to another embodiment of the present invention.

FIG. 16 is a diagram illustrating a procedure of controlling activation / deactivation of a cell associated with a second base station by a second base station according to another embodiment of the present invention.

17 is a diagram illustrating a procedure of activating a cell associated with a second base station by a second base station according to another embodiment of the present invention.

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

19 is a block diagram showing the configuration of a base station according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (user equipment) and a base station (base station, BS, or base station). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition to user equipment in WCDMA, LTE, and HSPA, as well as MS (Mobile Station), UT (User Terminal), SS in GSM, It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, a sector, a site, and a BTS. It may be called other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and the like.

In other words, in the present specification, a base station or a cell is a generic meaning representing a partial area or function covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, a base station or sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU communication range.

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

There is no limitation on the multiple access scheme 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. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

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. Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH). A data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

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

The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as a “base station”) and a high transmission power or a low transmission power in the macro cell region, which is wired controlled by an optical cable or an optical fiber to the base station. May be RRH.

In the following, 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 multiple transmission / reception points. In downlink, a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.'

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

Small cell scenarios 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 a lower transmission power than a general macro node.

Prior to 3GPP Release 11, Carrier Aggregation (CA) technology enabled the construction of small cells using low power remote radio heads (RRHs), which are geographically dispersed antennas 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. For this purpose, an ideal backhaul was required between the macro cell base station and the RRH node. An ideal backhaul means a backhaul that exhibits very high throughput and very low latency, such as a dedicated point-to-point connection using optical fiber, line of sight (LOS) microwaves. In contrast, backhaul that exhibits relatively low throughput and large delay, such as digital subscriber line (xDSL) and non-LOS microwave, is called non-ideal backhaul.

Using the above-described CA technology, a plurality of serving cells may be combined and operated to service a user equipment. That is, a plurality of serving cells may be configured for a terminal in an RRC connected (Radio Resource Control Connected) state, and when an ideal backhaul is established between the macro cell node and the RRH, the macro cell and the RRH cell are configured together with the serving cells. Could service.

When the above-described CA technology is configured, the terminal may have only one RRC connection with the network.

In an RRC connection establishment / re-establishment / handover, one serving cell provides NAS mobility information (eg, Tracking Area Identity, TAI). In addition, one serving cell provides a security input in RRC connection reset / handover.

Such a cell is called a primary cell (hereinafter, referred to as 'PCell'). The PCell can only change with the handover procedure.

Secondary cells (hereinafter, referred to as SCells) may be configured as serving cells together with PCells according to UE capabilities. Addition and removal of SCells may be performed by RRC.

For example, when adding a new SCell, dedicated higher layer signaling (eg, RRC signaling) may be used for all required system information transmission of the SCell. That is, in the connected mode, the terminal does not need to acquire system information broadcast directly from the SCells.

One base station processing the PCell and the SCells has different carriers (DL / UL PCC: Downlink / Uplink Primary Component Carrier, DL / UL SCC: Downlink / Uplink Secondary Component Carrier) in the physical layer. Therefore, the multi-carrier characteristic of the physical layer affects only a medium access control (MAC) layer having one hybrid automatic repeat request (HARQ) entity required for each serving cell. Radio Link Control (hereinafter referred to as 'RLC' / Packet Data Convergence Protocol (hereinafter referred to as 'PDCP')) does not affect the RLC / PDCP layer before carrier aggregation is introduced. Indistinguishable CA behavior.

In addition, in order to use the downlink component carrier (DL Component Carrier) and uplink component carrier (UL Component Carrier) of these SCells, the added SCells must be activated. That is, for efficient battery consumption of the terminal, an activation step separate from the SCell addition step for configuring SCells is required.

Activation and deactivation of the SCells may be performed through medium access control (MAC) signaling. When the SCells are deactivated, the UE does not need to receive the PDCCH or PDSCH, cannot transmit on the corresponding uplink, and does not need to measure channel quality indication (CQI). On the contrary, when SCells are activated, it is expected to receive PDCCH or PDSCH and perform channel quality indication (CQI) measurement.

As described above, in order to construct a small cell using a carrier aggregation technique in the conventional mobile communication network, the macro cell and the small cell had to be scheduled under the control of one base station. For this purpose, an ideal backhaul has to be established between the macro cell node and the small cell node.

Therefore, when the small cell base station is connected to the macro cell base station through a non-ideal backhaul, there is a problem in that data cannot be transmitted through the small cell base station (or through cooperation between the small cell base station and the macro cell base station) under the control of the macro cell base station. .

In order to solve this problem, the present invention activates a small cell in transmitting user data by adding a small cell under the control of the macro cell in an environment in which a non-ideal backhaul is established between the macro cell base station and the small cell base station in a mobile communication network. Or to provide a method of deactivation.

In the present specification, when the terminal configures dual connectivity, forms an RRC connection with the terminal, terminates the base station or S1-MME providing a PCell that is the basis of handover, and serves as a mobility anchor for the core network. A base station to be described as a master base station or a first base station.

The master base station or the first base station may be a base station providing a macro cell, and may be a base station providing any one small cell in a dual connectivity situation between the small cells.

Meanwhile, a base station that is distinguished from a master base station in a dual connectivity environment and provides additional radio resources to a terminal is described as a secondary base station or a second base station.

The first base station (master base station) and the second base station (secondary base station) may provide at least one cell to the terminal, respectively, and the first base station and the second base station may be connected through an interface between the first base station and the second base station. have.

In addition, a cell associated with the first base station may be referred to as a macro cell, and a cell associated with the second base station may be referred to as a small cell for clarity. However, in the small cell cluster scenario described below, a cell associated with the first base station may also be described as a small cell.

In the present invention, the macro cell may mean each of at least one or more cells, and may be described as representing a whole cell associated with the first base station. In addition, the small cell may also mean each of at least one or more cells, and may also be described as representing a whole cell associated with the second base station. However, as described above, in a specific scenario such as a small cell cluster, the cell may be a cell associated with the first base station. In this case, the cell of the second base station may be described as another small cell or another small cell.

Referring to FIG. 1, the terminal 102 is in macro cell and small cell coverage. That is, the terminal 102 may be simultaneously included in the small cell coverage overlapped in the macro cell coverage. The macro cell and the small cell have different carrier frequencies, and a non-ideal backhaul may be established between the first base station 110 and the second base station 120.

In FIG. 1, a macro cell and a small cell are constructed through different base stations and have an interface (eg, an Xn interface) between the first base station and the second base station.

In the situation as illustrated in FIG. 1, the terminal 102 may transmit and receive data through the first base station 110 and / or the second base station 120.

For example, in the scenario of FIG. 1, the terminal 102 may transmit data only through the second base station 120. That is, the second base station 120 may operate as a stand-alone base station and establish one RRC connection with the terminal 102. The terminal 102 may transmit control plane data through the RRC connection. In addition, at least one signaling radio bearers (SRBs) may be set. In order to transmit user plane data, the terminal 102 may have a second base station 120 and one or more data radio bearers (DRBs).

For another example, in the scenario of FIG. 1, the terminal 102 is user plane via the second base station 120 (or through cooperation between the first base station and the second base station) under the control of the first base station 110. You can also send data.

In detail, the terminal 102 may establish one RRC connection with the first base station 110 in order to transmit control plane data. In addition, the terminal 102 may establish one or more Signaling Radio Bearers (SRBs) with the first base station 110. The terminal 102 may have a second base station 120 and one or more DRBs (Data Radio Bearers) for user plane data transmission.

As such, when the terminal 102 transmits user plane data to the second base station 120 under the control of the first base station 110, the terminal 102 may transmit the data through various paths. Hereinafter, a detailed path will be described with reference to FIGS. 2 and 3.

2 (a) is a diagram illustrating an example of user data transmission through an interface between a first base station and a second base station to which the present invention can be applied.

Referring to FIG. 2 (a), after user data is transferred from a serving gateway (S-GW), which is an Evolved Packet Core (EPC) entity, to a first base station, the first base station is transmitted to the terminal through the second base station. I can deliver it.

2 (b) is a diagram illustrating another example of user data transmission through an interface between a first base station and a second base station to which the present invention can be applied.

Referring to FIG. 2B, the UE transmits user plane data through both the first base station and the second base station or through only the first base station under the control of the first base station (or through cooperation with the second base station). It may be. That is, the terminal establishes one RRC connection with the first base station and transmits one or more Signaling Radio Bearers (SRBs) for control plane data transmission. In addition, the UE may configure one or more Data Radio Bearers (DRBs) in the first base station and the second base station for user plane data transmission. Alternatively, the UE may configure one or more DRBs (Data Radio Bearers) through only the first base station for user plane data transmission.

As another method, referring to FIG. 3, user data may be delivered to a terminal through a second base station directly from a serving gateway (S-GW), which is a core network entity.

In FIG. 2 and FIG. 3, the solid line indicates the control plane data transmission path and the dotted line indicates the user plane data transmission path.

Hereinafter, unlike the scenario of FIG. 1, the operation when the UE belongs to any one of macro cell and small cell coverage will be described.

The terminal may transmit all data only through the first base station when it is only under the first base station coverage (eg, macro cell). That is, the terminal may establish one RRC connection with the first base station and control one or more Signaling Radio Bearers (SRBs) for control plane data transmission. In addition, the terminal may configure one or more DRBs (Data Radio Bearers) with the first base station for user plane data transmission.

In addition, the terminal may transmit all data only through the second base station when it is only under the second base station coverage (eg, a small cell). That is, the terminal may establish one RRC connection with the second base station for control plane data transmission, and may configure one or more signaling radio bearers (SRBs). In addition, the terminal may configure one or more DRBs (Data Radio Bearers) with the second base station for user plane data transmission.

Alternatively, there may be a case where the second base station transmits user plane data under the control of the first base station or through cooperation with the first base station.

In this case, the terminal may establish the RRC connection only through the first base station. That is, even when the terminal is close to the second base station, when the terminal overlaps under the coverage of the macro cell, a signal of a predetermined level or more may be received from the first base station. In this situation, the UE may establish one RRC connection only through the first base station. In addition, the macro serving cell may provide NAS mobility information (eg, Tracking Area Identity, TAI) and security input at RRC connection establishment / re-establishment / handover. . That is, the first base station can process signaling required between the terminal and the first base station and the terminal and the second base station.

Meanwhile, a brief description will be made of a case in which a cell associated with a second base station provides a service to a terminal together with a cell associated with a first base station. According to terminal capabilities, a cell associated with a second base station is associated with a cell associated with a first base station. It may be configured as a serving cell. Alternatively, the cell associated with the second base station may be configured with SCell (Secondary cells) under control of the cell associated with the first base station according to terminal capabilities. Alternatively, the cell associated with the second base station according to terminal capabilities may be configured with SCells (Secondary cells) that transmit user plane data under control of a cell associated with the first base station. Alternatively, the cell associated with the first base station may be configured as a serving cell for transmitting control plane data and the cell associated with the second base station according to terminal capabilities.

As described with reference to FIGS. 1 to 3, in a situation where the first base station and the second base station are connected by non-ideal backhaul, the terminal communicates with the network through a cell associated with the first base station and / or a cell associated with the second base station. The scenario to perform was described in detail.

Hereinafter, a cell (small cell) addition / modification procedure associated with a second base station for performing communication by configuring a cell associated with a second base station will be described.

The terminal may add or remove a cell associated with the second base station to a serving cell or SCell for user plane data transmission. In addition, one or more DRBs (Data Radio Bearers) may be added or released through the second base station. This procedure may be performed by RRC signaling through the first base station.

Specifically, for example, if the first base station decides to add a cell associated with the second base station as a serving cell or SCell for user plane data transmission through the second base station, the first base station is connected to the second base station through RRC signaling. All required system information of the associated cell can be transmitted. And / or determining to add / modify one or more DRBs via the second base station, the first base station may transmit all required system information of the cell associated with the second base station via RRC signaling. That is, in the connected mode, the terminal may not need to acquire system information broadcasted directly from the cell associated with the second base station.

Referring to Figure 4 looks at in detail the procedure for the terminal to add / modify the cell associated with the second base station.

FIG. 4 is a diagram illustrating a small cell addition / modification procedure to which the present invention can be applied.

Referring to FIG. 4, when the UE 403 establishes an RRC connection with the first base station 401 and is in an RRC connected state, the terminal 403 may add a cell associated with the second base station.

The first base station 401 may determine the addition / modification of a cell associated with the second base station (S410).

When the first base station 401 determines the cell addition / modification associated with the second base station, the first base station 401 requests a second base station 402 to request a cell addition / modification associated with the second base station (eg For example, the second base station cell addition / modification request message or the second base station addition / modification request message) is transmitted (S420).

Specifically, for example, the message for requesting the addition / modification of a cell associated with the aforementioned second base station may include at least one or more of the following information. The second base station secondary cell described below refers to a cell associated with the second base station and may be configured as a SCell in the terminal.

■ Message Type Information: Contains information to identify the procedure type of the message. The above-described message may be a message for requesting the addition / modification of a cell associated with the second base station, or the cell addition / modification associated with the second base station may be added to the same message as the request for requesting the radio bearer addition / modification for the second base station. It may be a message for including.

First base station terminal X2AP ID: Contains identifier information allocated by the first base station.

■ Second base station secondary cell (small cell) add / modify request list: the list of the second base station secondary cell that the first base station wants to request the addition / modification, the number of SCells available in CA based on a single base station before Release 11 ( You can request up to 4 as in maxSCell-r10). If the first base station makes a request for adding / modifying a second base station secondary cell, or before the first base station adds / modifies radio resources of the second base station for a specific bearer, or a secondary cell associated with the second base station to the terminal. Before this configuration, if one or more cells associated with the first base station are configured to be added to the terminal as a SCell, the second base station secondary cell (small cell) add / modify request list includes a SCell that is possible in a CA based on a single base station before Release 11 The number maxSCell-r10 may be requested to subtract the number of SCells associated with the first base station configured in the current terminal. For example, if two SCells associated with the first base station are added to the current terminal, up to two second base station secondary cell addition / modification request lists included in the second base station secondary cell addition / modification request may be requested up to two. .

◆ Cell (Small Cell) ID: Contains information about the E-UTRAN Cell Global Identifier (ECGI) of the cell associated with the second base station or the cell physical cell ID (PCI) associated with the second base station.

◆ Secondary cell (small cell) index: within the SCells configured in the terminal or in the second base station secondary cells (small cells) configured in the terminal or in the second base station secondary cells (small cells) configured with the SCell in the terminal or The terminal includes index information for identifying each second base station secondary cell (small cell) or SCell in the SCells configured of the second base station secondary cell.

Receiving a message from the first base station 401 to request cell addition / modification associated with the second base station, the second base station 402 sends a message for responding to a cell add / modification request associated with the second base station. It transmits to 401 (S425).

Specifically, for example, the message for responding to the cell addition / modification request associated with the above-described second base station may include at least one or more of the following information.

■ Message Type: Contains information to identify the procedure type of the message. The aforementioned message may be a message for responding to a request for adding / modifying a cell associated with a second base station, or a cell associated with a second base station for the same message as for responding to a request for adding / modifying a radio bearer to the second base station. It may also be a message to reply including addition / modification.

Second base station terminal X2AP ID: Contains identifier information allocated by the second base station.

■ Second base station secondary cell (small cell) addition / modification request list: includes list information for the second base station secondary cell including the cell addition / modification information.

Cell (Small Cell) Identifier: Includes PCI and Absolute Radio Frequency Channel Number (ARFCN) information of the cell associated with the second base station.

◆ Secondary cell (small cell) index: within the SCells configured in the terminal or in the second base station secondary cells (small cells) configured in the terminal or in the second base station secondary cell (small cell) configured with the SCell in the terminal or the terminal The index information used to identify each second base station secondary cell (small cell) or SCell in SCells composed of second base station secondary cells.

The aforementioned index (secondary cell index or second base station secondary cell (small cell) index) may be determined or assigned by the second base station. And it may not be included in the message for requesting the addition / modification of the cell associated with the second base station of the first base station.

Alternatively, the aforementioned index may be determined or assigned by the first base station to be included in a message for requesting the addition / modification of a cell associated with the second base station, and transmitted, and the response of the cell addition / modification request associated with the second base station is transmitted. May not be included in the message.

In another method, the aforementioned index may be transmitted by being included in a message for requesting the addition / modification of a cell associated with the aforementioned second base station by the first base station. The second base station may check and determine this and include the message in a message for responding to a cell add / modify request associated with the second base station.

Alternatively, the above-described index may use a value (for example, 0 or 8) rather than a value (for example, 1 to 7) used as an existing SCell index. In this case, it may or may not be included in both the message for requesting the addition / modification of a cell associated with the second base station and the message for responding to the cell addition / modification request associated with the second base station. In order to use a value other than the value used as the existing SCell index, the SCell index that can currently have an integer value from 1 to 7 can be an integer value from 1 to 14, and an integer from 1 to 7 The value may be used as an index for SCells of the first base station and 8 to 14 as an index for the second base station. Alternatively, the SCell index and the indication information (or cell identifier of the second base station) may be sent together to distinguish the SCell index of the first base station and the SCell index of the second base station. have. In another method, a value (1 to 7) that can be used as an SCell index can be distinguished from the SCell index of the first base station and the SCell index of the second base station, and assigned to the first base station SCell index and the second base station index value. can do. For example, the first base station SCell index may be assigned only 1 to 4 values, and the second base station SCell index may be allocated only 5 to 7 values, or the first base station SCell index may be assigned only 1 to 3 values. The second base station SCell index may be assigned, and a method such as assigning only 4 to 7 values may be used.

◆ cell common radio resource configuration information (radioresourceconfigcommon) associated with the second base station: includes essential information for the terminal to operate in the cell associated with the second base station. For example, it may include a physical layer configuration parameter or a physical layer configuration parameter and a MAC layer configuration parameter corresponding to the system configuration information.

Cell dedicated radio resource configuration information associated with the second base station: The terminal specific dedicated configuration information (eg, physical channel configuration, mac-MainConfig) for the cell associated with the second base station may be included. For example, the cell-specific radio resource configuration information associated with the second base station may include PDCP layer configuration information (including only when using a user plane structure as shown in FIG. 3) for a radio bearer transmitted through the second base station, and through the second base station. RLC layer configuration information for transmitting radio bearer, logical channel identifier (logicalChannelIdentity) for radio bearer transmitting through second base station, logical channel configuration information (logicalChannelConfig), MAC layer for radio bearer transmitting through second base station One or more pieces of configuration information and physical layer configuration information for a radio bearer transmitted through the second base station.

The first base station 401 receiving a message for responding to a request for adding / modifying a cell associated with a second base station which may include at least one or more of the above information transmits higher layer signaling to the terminal 403 ( S430).

The first base station 401 is a cell information associated with the second base station to be added / modified received through the second base station in a higher layer signaling (eg, an RRC connection reconfiguration message) or a second to be added / modified. Base station SCell information (for example, SCellToAddMod or SeNBSCellToAddMod) may be included and transmitted (S430).

The cell information associated with the above-described second base station to be added / modified may use the information included in the message for responding to the cell add / modify request associated with the second base station described above.

Specifically, for example, the cell information associated with the above-described second base station to be added / modified may include at least one or more of the following information.

Secondary Cell (Small Cell) Identifier: Contains the PCI and the Absolute Radio Frequency Channel Number (ARFCN) of the cell associated with the second base station.

◆ Secondary cell (small cell) index: within the SCells configured in the terminal or in the second base station secondary cells (small cells) configured in the terminal or in the second base station secondary cells (small cells) configured with the SCell in the terminal or The terminal includes index information used to identify each second base station secondary cell (small cell) or SCell in the SCells constituted by the second base station secondary cell (small cell).

The above-described index (secondary cell index or second base station secondary cell (small cell) index) may be determined or assigned by the second base station. And it may not be included in the message for requesting the addition / modification of the cell associated with the second base station of the first base station.

Alternatively, the aforementioned index may be included in a message for requesting the addition / modification of the cell associated with the second base station by the first base station, determined or assigned, and transmitted in response to the cell addition / modification request associated with the second base station. It may not be included in the message.

Alternatively, the aforementioned index is included in a message for requesting the addition / modification of a cell associated with the second base station by the first base station determined or assigned, and the second base station confirms and determines the cell associated with the second base station. It may also be included in a message to respond to an add / modify request.

As another method, the small cell index or the SCell index may use a value (for example, 0 or 8) that is not a value (for example, 1 to 7) used as an existing SCell index. In this case, the cell addition / modification request message associated with the second base station and the cell addition / modification response message associated with the second base station may or may not be included in both. In order to use a value other than the value used as the existing SCell index, the SCell index that can currently have an integer value from 1 to 7 can be an integer value from 1 to 14, and an integer from 1 to 7 The value may be used as an index for SCells of the first base station and 8 to 14 as an index for the second base station. Alternatively, the SCell index and the indication information (or cell identifier of the second base station) may be sent together to distinguish the SCell index of the first base station and the SCell index of the second base station. have. In another method, a value (1 to 7) that can be used as an SCell index can be distinguished from the SCell index of the first base station and the SCell index of the second base station, and assigned to the first base station SCell index and the second base station index value. can do. For example, the first base station SCell index may be assigned only 1 to 4 values, and the second base station SCell index may be allocated only 5 to 7 values, or the first base station SCell index may be assigned only 1 to 3 values. The second base station SCell index may be assigned, and a method such as assigning only 4 to 7 values may be used.

Cell common radio resource configuration information (radioresourceconfigcommon) associated with the second base station: essential information for the terminal to operate in a cell associated with the second base station (physical layer configuration parameters or physical layer configuration parameters corresponding to the system configuration information; Contains information about the MAC layer configuration parameters.

◆ Cell-specific radio resource configuration information associated with the second base station: The terminal specific configuration information (eg, physical channel configuration mac-MainConfig) for the cell associated with the second base station may be included. For example, the cell-specific radio resource configuration information associated with the second base station may include PDCP layer configuration information (including only when using a user plane structure as shown in FIG. 3) for a radio bearer transmitted through the second base station, and through the second base station. RLC layer configuration information for transmitting radio bearer, logical channel identifier (logicalChannelIdentity) for radio bearer transmitting through second base station, logical channel configuration information (logicalChannelConfig), MAC layer for radio bearer transmitting through second base station One or more pieces of configuration information and physical layer configuration information for a radio bearer transmitted through the second base station.

The terminal 403 may perform higher layer signaling (eg, including cell information associated with the second base station to be added / modified from the first base station 401 or second base station SCell information (eg, SCellToAddMod) to be added / modified (eg, RRC Connection Reconfiguration message) can be received (S430), and a cell associated with the second base station can be added or modified based on higher layer signaling (S435).

Specifically, for example, the terminal 403 is not the current terminal configuration part, but the aforementioned cell information associated with the second base station to be added / modified or the second base station SCell information (eg, SCellToAddMod) to be added / modified (eg, SCellToAddMod). For each SCell Index value included in the SCellToAddModList that is not part of the current ue configuration, the second base station is based on the cell common radio resource information associated with the second base station and the cell dedicated radio configuration information associated with the second base station. A cell associated with may be added (S435).

The terminal 403 may be configured such that a cell associated with the second base station is deactivated in a lower layer. For example, in a terminal including a radio bearer configuration in which user plane data is transmitted using a first base station and a second base station together (for example, a radio bearer configured to additionally use radio resources of a second base station in a terminal). The cell additional information associated with the second base station is configured, or the additional information of the cell associated with the second base station is configured in higher layer signaling for transmitting user plane data using the first base station and the second base station together. If so, the terminal may be configured such that the cell associated with the second base station added to the lower layer is considered in an inactivated state. As another example, when additional information of cells associated with the second base station is configured in upper layer signaling for transmitting user plane data using the first base station and the second base station together, the terminal is connected to the second base station configured in the lower layer. It can be configured to be considered inactive except for one of the associated cells. For example, the terminal may configure one specific cell in an activated state and configure an inactive state for cells associated with the second base station in order to control activation / deactivation of cells associated with the second base station.

Alternatively, the terminal 403 may be configured such that a cell associated with the second base station is considered to be activated when a cell associated with the second base station is added as a serving cell or a cell associated with the second base station is added with the SCell. have. For example, when the first (one) cell associated with the second base station is added, the specific cell may be configured to be in an activated state. If all cells associated with the second base station are configured to be in an inactive state, since the second base station cannot activate the cell associated with the second base station through the cell associated with the second base station, the radio bearer configured through the second base station In order to transmit data, a need arises for a second base station to activate a cell associated with the second base station via the first base station. This may cause a delay in data transmission due to a backhaul delay between the first base station and the second base station. Therefore, when adding a cell associated with a second base station by the first base station for the first time, it is necessary to configure a specific cell in an activated state.

Alternatively, the terminal 403 may be configured such that when a cell associated with the second base station is added for user plane data transmission, a specific cell associated with the second base station is considered to be activated in a lower layer. That is, when a cell associated with the second base station is added to transmit user plane data by using additional radio resources of the second base station that is distinguished from the first base station, for example, a radio bearer transmitted only through the second base station When cell addition information associated with the second base station is configured in higher layer signaling including configuration information, the terminal may be configured such that a specific cell associated with the second base station is considered to be activated in the lower layer.

As another example, if the cell additional information associated with the second base station is configured in higher layer signaling including radio bearer configuration information transmitted by using the first base station and the second base station together, the terminal may have a specific cell associated with the second base station in the lower layer. It can be configured to be considered active. As another example, when the cell additional information associated with the second base station is newly configured in higher layer signaling including radio bearer configuration information transmitted by using the first base station and the second base station, the terminal newly configures the second base station in the lower layer. It may be configured to be considered active until the cell associated with is released and / or until a handover message is received.

As another example, when additional information of cells related to the second base station is configured in upper layer signaling including radio bearer configuration information transmitted by using the first base station and the second base station, the terminal is connected to the second base station configured in the lower layer. One or more of the associated cells may be configured to be considered active until the cell is released and / or until a handover message is received. In this case, the terminal may select a specific cell associated with the second base station having a high radio channel quality (or state) among the cells associated with the second base station in consideration of the radio channel quality (or state) and configure the activated cell.

In another method, the terminal selects a specific cell associated with the second base station having a high radio channel quality (or state) among cells associated with the second base station, and activates the terminal to transmit activation or deactivation indication information of the cell associated with the second base station. In order to configure the state, the first base station provides the cell information associated with the second base station to be kept active to deliver the activation or deactivation indication information of the cell associated with the second base station to the terminal based on the measurement report received from the terminal. It may be delivered through higher layer signaling (eg, an RRC Connection Reconfiguration message). The terminal uses this information to configure a specific cell associated with a second base station with a high radio channel quality (or state) in an activated state, and to activate or deactivate a cell associated with a second base station through a cell of the configured second base station. Information can be received.

In another method, the UE selects a cell associated with a second base station having a low load in consideration of the load of the cell associated with the second base station among cells associated with the second base station, and activates or deactivates the indication information of the cell associated with the second base station. The second base station generates specific cell information associated with the second base station to be kept active to deliver the activation or deactivation indication information of the cell associated with the second base station to the terminal so as to be configured in an activated state to transmit the RRC. Send to the first base station through the container.

The first base station transmits the above information to the terminal through higher layer signaling (e.g., an RRC reconfiguration message) so that the terminal can activate the active state until the cell is released through the information and / or until a handover message is received. A specific cell associated with the second base station to be maintained may be configured, and activation or deactivation indication information of a cell associated with the second base station may be received through the specific cell of the second base station configured to be activated.

Alternatively, add a cell associated with the second base station described above with a procedure for selecting a particular cell to be configured as active until the first base station and the second base station are released and / or until a handover message is received. / Modify and / or can be performed through the radio bearer add / modify procedure to the second base station. For example, the first base station sends candidate cell (s) information of a particular cell to be activated until the cell is released to the second base station and / or until a handover message is received, and the second base station sends the candidate cell (s). In the information, a specific cell to be kept active until a cell is released and / or a handover message is received may be selected and transmitted to the terminal through the first base station.

Alternatively, when the second base station selects a specific cell to be activated until the cell is released and / or receives a handover message and transmits the specific cell to the terminal through the first base station, the first base station transmits the measured cell based on the measurement information. When the quality of a specific cell is lower than a certain level, a specific cell to be activated until the cell is released and / or until a handover message is received is changed to be viewed as a terminal or a cell addition / modification request associated with a second base station and / Alternatively, the content may be included in the rejection / response message for the radio bearer addition / modification request to the second base station and sent to the second base station.

That is, as described above, the terminal may configure a specific cell associated with the second base station in an active state in configuring a cell associated with the second base station. The specific cell associated with the second base station configured in the activated state may be at least one cell. Hereinafter, a specific cell associated with the second base station may be described as a cell configured in an activated state or a cell associated with a second base station configured in an activated state.

To this end, the first base station 401 receives the cell information associated with the second base station to be added / modified received through the second base station of the above-described higher layer signaling (eg, an RRC connection reconfiguration message) or received through the second base station. Information for indicating a specific cell associated with a second base station in SCell information to be added / modified (for example, SCellToAddMod or SeNBSCellToAddMod) or information for indicating a specific cell associated with a second base station for user plane data transmission or a second It may include radio bearer configuration information (eg, RLC configuration information, logical channel configuration information) through a specific cell associated with a base station or physical channel configuration information for a specific cell associated with a second base station.

In another method, a value other than a value (for example, 1 to 7) that is used as the existing SCell index in the small cell index or SCell index of the cell information associated with the second base station to be added / modified or the SCell information to be added / modified ( For example, it may be displayed using 0 or 8). Alternatively, in order to use a value other than the value used as the existing SCell index, the SCell index that can currently have an integer value of 1 to 7 can have an integer value of 1 to 14, and The integer value may be used as an index for SCells of the first base station and 8 to 14 as an index for the second base station.

Alternatively, the SCell index and the indication information (or cell identifier of the second base station) may be sent together to distinguish the SCell index of the first base station and the SCell index of the second base station. have. As another method, a value that can be used as an SCell index can be divided so as to distinguish between the SCell index of the first base station and the SCell index of the second base station and assigned to the first base station SCell index and the second base station index. For example, the first base station SCell index to use from 1 to 4 values, and the second base station SCell index to use only from 5 to 7 values, or the first base station SCell index to use from 1 to 3 values. The second base station SCell index may be a method such as using only 4 to 7 values.

The UE is associated with the received second base station with respect to the aforementioned index included in the cell information associated with the second base station to be added / modified in the current terminal configuration part or SCell information (eg, SCellToAddMod or SeNBSCellToAddMod). Modify the cell associated with the second base station according to the cell dedicated radio configuration information.

When the cell or SCell associated with the added or modified second base station is activated, the terminal 403 should receive the downlink PDCCH or PDSCH using the cell or SCell associated with the second base station and transmit on the corresponding uplink. can do. The terminal may configure the radio bearer through the second base station to transmit user plane data (S440).

As described with reference to FIG. 4, when the terminal adds a cell associated with the second base station or adds a cell associated with the second base station to the SCell, the network may activate or deactivate a cell or SCell associated with the configured second base station. Alternatively, the network may activate or deactivate cells associated with the second base station through the second base station except for a cell associated with the configured second base station or a cell configured to always be activated until the SCell is released. However, the macro cell operating as the PCell of the first base station is always in an activated state.

Therefore, hereinafter, a method of activating or deactivating a cell or SCell associated with a second base station added or modified by a terminal according to an embodiment of the present invention will be described.

A method for activating or deactivating a cell associated with a second base station, by a terminal according to an embodiment of the present invention, the method comprising: receiving higher layer signaling received through the first base station after signaling between the first base station and the second base station; Configuring a specific cell associated with the second base station to an activated state and configuring a radio bearer via the second base station.

Referring to FIG. 5, a signaling procedure between the first base station 501 and the second base station 502 is performed (S510). Signaling performed at this time may be performed through an interface between base stations configured between the first base station 501 and the second base station 502.

In addition, signaling between the first base station 501 and the second base station 502 according to another embodiment of the present invention distinguishes a cell associated with the first base station 501 and a cell associated with the second base station 502 by a cell index. You can organize the information.

Thereafter, the first base station 501 transmits higher layer signaling to the terminal 503 (S520).

Higher layer signaling includes cell addition configuration information associated with the second base station 502, and cell addition configuration information associated with the second base station 502 includes a cell to which to transmit activation or deactivation indication information of a cell associated with the second base station. Information or cell information to be kept in an activated state.

The terminal 503 may receive higher layer signaling from the first base station 501 and configure a specific cell associated with the second base station 502 in an activated state (S530). If there are a plurality of cells associated with the second base station, as described above, at least one specific cell may be configured to be in an activated state.

The terminal 503 configures a radio bearer through the second base station (S540).

According to another embodiment of the present invention, the terminal receives activation-related indication information including information for activating or deactivating a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station through the second base station. And controlling to activate or deactivate a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station based on the receiving step and the activation related indication information.

Referring to FIG. 6, a signaling procedure between the first base station 601 and the second base station 602 is performed (S610). Signaling performed at this time may be performed through an interface between base stations configured between the first base station 601 and the second base station 602.

In addition, the signaling between the first base station 601 and the second base station 602 according to another embodiment of the present invention distinguishes a cell associated with the first base station 601 and a cell associated with the second base station 602 by a cell index. You can organize the information.

Thereafter, the first base station 601 transmits higher layer signaling to the terminal 603 (S620).

Higher layer signaling includes cell addition configuration information associated with the second base station 602, and cell addition modification configuration information associated with the second base station 602 transmits activation or deactivation indication information of a cell associated with the second base station. Information or cell information to be kept in an activated state.

The terminal 603 may receive higher layer signaling from the first base station 601 and configure a specific cell associated with the second base station 602 in an activated state (S630). If there are a plurality of cells associated with the second base station, as described above, at least one specific cell may be configured to be in an activated state.

The terminal 603 configures a radio bearer through the second base station (S640).

The terminal 603 receives activation related indication information from the second base station 602 (S650). Activation-related indication information may be received as included in the medium access control (MAC) signaling, and MAC control including a field indicating whether to activate a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station. It may include at least one of the element and the MAC header.

Regarding inclusion in specific MAC signaling, it will be described in detail below with reference to FIG. 11.

In a method for activating or deactivating a cell associated with a second base station by a terminal in which a cell associated with a second base station is added as a serving cell according to an embodiment of the present invention, to a first base station and a second base station providing a macro cell Receiving activation related indication information including information indicating to activate or deactivate a cell associated with the second base station from any of the second base stations providing the associated cell and the second base station based on the activation related indication information; And controlling a cell, which is distinguished from a specific cell configured in an activated state, from among cells associated with.

In addition, the activation-related indication information according to the present invention is received by being included in the media access control (MAC) signaling or higher layer signaling, the media access control signaling is a specific configuration configured in the active state of the cell associated with the second base station It may include a MAC control element and / or MAC header including a field indicating whether to activate a cell distinguished from the cell.

A method of activating or deactivating a cell associated with a second base station to which a terminal 703 has been added will be described in detail with reference to FIG. 7.

First embodiment: A method using MAC signaling by a first base station (701).

The terminal 703 according to an embodiment of the present invention may receive activation related indication information including indication information indicating to activate or deactivate a cell associated with the second base station from the first base station 701 (S730). .

In addition, the activation related indication information includes an activation / deactivation MAC control element, and the first base station 701 may transmit it through MAC signaling (S730).

The terminal 703 may activate or deactivate a cell associated with the second base station based on the received MAC signaling (S740).

In other words, the first base station 701 according to an embodiment of the present invention determines whether to activate a cell associated with the second base station (S710).

Thereafter, the first base station 701 may generate activation related indication information of a cell associated with the second base station that is to be activated or deactivated (S720).

The generated activation related indication information is transmitted to the terminal 703 through MAC signaling (S730), and the terminal 703 may activate or deactivate a cell associated with the second base station based on the received activation related indication information (S730). S740).

On the other hand, the terminal 703 maintains a cell deactivation timer associated with the second base station for the cell associated with the configured second base station. If the cell deactivation timer associated with the second base station expires, deactivate the cell associated with the second base station associated with the expiry. The cell deactivation timer associated with this second base station may be configured by the RRC. Because the non-ideal backhaul delay between the first base station and the second base station may prevent the first base station from quickly checking information on the activation state of the second base station secondary cell, the deactivation timer may be a secondary cell deactivation timer of the first base station. sCellDeactivationTimer-r10) and other fields may be defined and configured.

In addition, the activation related indication information may be transmitted through not only MAC signaling but also upper layer signaling, which will be described in the second and third embodiments.

A detailed process of activating or deactivating a cell associated with the second base station by receiving the activation related indication information by the terminal 703 will be described below with reference to FIGS. 8 and 9.

The terminal 803 according to another embodiment of the present invention controls the activation or deactivation of the cell associated with the second base station based on the activation related indication information received from the first base station 801, the activation related indication information. May further include activating a cell associated with the second base station and starting a deactivation timer.

For example, referring to FIG. 8, the terminal 803 relates to activation for activating a cell associated with a second base station at this TTI for a cell associated with each transmission time interval (TTI) and each configured second base station. Upon receipt of the indication information, the TTI activates the cell associated with the second base station. In another method, in consideration of the non-ideal backhaul delay between the first base station and the second base station, the terminal 803 transmits a second base station to this TTI for a cell associated with each transmission time interval (TTI) and each configured second base station. Receiving activation-related indication information for activating a cell associated with the, after the non-ideal backhaul delay time between the first base station and the second base station in this TTI (or non-ideal backhaul between the first base station and the second base station in this TTI) Activate the cell associated with the second base station (TTI) after one hour twice the delay.

That is, the first base station 801 determines whether to activate the cell associated with the second base station based on the measurement report for the cell associated with the second base station, the first base station load, etc. (S810), and determines the activation to indicate activation indication information. To generate (S820).

In another embodiment of FIG. 8, the first base station 801 determines whether to activate the cell associated with the second base station based on the measurement report, the first base station load, etc. for the cell associated with the second base station, and the second base station 802. Request an activation instruction, and the second base station may generate the activation instruction information and transmit the activation instruction information to the terminal.

As described with reference to FIGS. 5 to 7, in the first embodiment, the activation related indication information may be transmitted through MAC signaling, and the MAC control element includes field information indicating a cell associated with the activation target second base station in the MAC CE; And / or MAC header may be included.

The first base station 801 transmits activation indication information to the terminal 803 (S830).

The terminal 803 activates the cell associated with the activation target second base station indicated by the aforementioned MAC header based on the received activation indication information (S840). In addition, the cell inactivity timer associated with the second base station may be started (S850).

When the cell associated with the second base station is activated, the terminal 803 may perform communication with the second base station 802 through the cell associated with the second base station (S860).

Specifically, for example, when the terminal 803 receives the activation indication information, a cell operation associated with a normal second base station (eg, SRS transmission or CQI / PMI / in a cell associated with the second base station). RI / PTI measurement report or PDCCH monitoring of a cell associated with the corresponding second base station and for a cell associated with the second base station). The cell deactivation timer associated with the second base station associated with the cell associated with the second base station is started (S850).

Steps S840 and S850 may be performed sequentially or at the same time or in a reversed order.

As described above, when the cell deactivation timer associated with the second base station expires, the cell associated with the second base station may be deactivated.

9 illustrates a procedure of deactivating a cell associated with a second base station by a terminal according to another embodiment of the present invention.

The terminal 903 according to another embodiment of the present invention controls the activation or deactivation of the cell associated with the second base station based on the activation related indication information received from the first base station 901, the handover command When receiving upper layer signaling (RRC reconfiguration message) including information (mobilityControlInfo), the cell associated with the second base station or all cells associated with the second base station are deactivated, the deactivation timer is stopped, and a HARQ (Hybrid Automatic Repeat request) is performed. It may further comprise the step of deleting.

Referring to FIG. 9, the first base station 901 may determine whether to activate a cell associated with the second base station or determine whether to handover a macro cell (S910).

If the first base station 901 determines to deactivate the cell associated with the second base station or handover the macro cell according to the determination result, the first base station 901 generates corresponding information (S920).

The terminal 903 receives the deactivation indication information or the handover command information generated from the first base station 901 (S930).

The terminal 903 may select a cell associated with the second base station or all cells associated with the second base station when the above-described activation related indication information includes the deactivation indication information or is received through higher layer signaling including handover command information. Deactivate (S940).

Thereafter, the terminal 903 may stop the cell deactivation timer associated with the second base station (S950) and flush the HARQ (S960). Steps S940 to S960 described above may be performed sequentially, simultaneously, or may be reversed.

In CA technology prior to 3GPP Release-11, when the UE receives a handover command, the UE performs a handover to the target PCell, so there is no need to deactivate the source PCell that is always activated in a single base station. . That is, the PCell can be configured as the target PCell without having to deactivate the source PCell. However, in the case of a terminal that transmits data through additional radio resources of a second base station that is distinguished from the first base station, it is possible to activate / deactivate cells associated with the second base station through the second base station. To this end, in the case of a cell configured to be in an active state while the cell associated with the second base station is maintained, the handover command information may be changed when the handover command is received. It is necessary to receive higher layer signaling that includes and perform deactivation for all cells associated with the second base station.

Each step is explained concretely with an example.

Upon receiving the MAC CE including the deactivation indication information, the terminal 903 deactivates the cell associated with the second base station in the TTI, stops the cell deactivation timer associated with the second base station, and HARQ associated with the cell associated with the second base station. Flush the buffer.

Or if the cell deactivation timer associated with the second base station expires at this TTI, the terminal 903 deactivates the cell associated with the second base station in the TTI, stops the cell deactivation timer associated with the second base station, and the cell associated with the second base station. Flush the HARQ buffer associated with.

Alternatively, when the terminal 903 receives the handover command information, the terminal 903 configures the cell associated with the second base station configured in the lower layer to be considered to be in an inactive state.

That is, when the terminal 903 receives an RRC connection reconfiguration message including mobility control information from the first base station 901, the terminal 903 transmits a cell associated with the second base station to a lower layer. Or configure the cell associated with the second base station configured with the SCell to be considered in an inactive state. The terminal 903 may keep the cell associated with the second base station in an inactive state until receiving the cell activation indication information associated with the second base station.

When the terminal 1003 according to another embodiment of the present invention receives at least one of uplink grant or downlink allocation information for a cell associated with the second base station, the terminal 1003 may deactivate the deactivation timer for the cell associated with the second base station. You can control it to restart.

Referring to FIG. 10, if a PDCCH for a cell associated with an activated second base station indicates an uplink grant or a DL assignment, the terminal 1003 transmits to the second base station. The inactivity timer for the associated cell may be restarted (S1080).

Or if the PDCCH for the serving cell scheduling the cell associated with the activated second base station indicates uplink grant or downlink assignment, restart the deactivation timer for the cell associated with the second base station. Can be.

As described above with reference to FIGS. 5 and 6, the first base station 1001 may determine whether to activate a cell associated with the second base station (S1010), and generate activation indication information (S1020).

Thereafter, the first base station 1001 transmits activation indication information (S1030).

The terminal 1003 activates a cell associated with the second base station based on the received activation indication information, and starts a cell deactivation timer associated with the second base station (S1050).

Processes of S1010 to S1060 may be the same as the process described with reference to FIGS. 5 and 6.

Thereafter, when uplink grant or downlink allocation information is received according to another embodiment of the present invention, the terminal 1003 restarts the cell deactivation timer associated with the ongoing second base station (S1080).

For example, the terminal 1003 may control the cell deactivation timer associated with the second base station to restart from the beginning after the cell associated with the second base station is activated. When the cell deactivation timer associated with the second base station expires, the cell associated with the second base station may be deactivated. Therefore, the activation time of the cell associated with the second base station configured in the terminal 1003 may be increased by restarting the cell deactivation timer associated with the second base station.

As described above, the first base station may control cell activation associated with the second base station of the terminal by transmitting MAC signaling including information indicating to activate or deactivate a cell associated with the second base station configured in the terminal.

Hereinafter, a method of including indication information for controlling cell activation associated with a second base station in MAC signaling will be described in detail with reference to FIG. 11.

Referring to FIG. 11, an activation / deactivation MAC control element 1100 may be identified by a MAC PDU subheader having a logical channel ID (LCID).

For example, MAC control element 1100 has a fixed size and consists of a single octet comprising seven C-fields 1101 to 1107 and one R-field 1108.

If there is a cell associated with the second base station configured with the SCellindex or the cell index i associated with the second base station, this field 1101-1108 indicates the SCell with the SCeill index i or the cell index i associated with the second base station; Indicate an activation state of a cell associated with the second base station.

Or if there is a cell associated with the second base station configured with SCell with SCell index i, this field 1101-1108 indicates the activation state of the cell associated with the second base station with SCeill index i or cell index i associated with the second base station; Display.

Specifically, for example, when the Ci fields 1101 to 1108 are set to "1", it indicates that the cell associated with the corresponding SCell or the second base station should be activated. If set to "0", the corresponding SCell or the second base station is set. Indicates that the cell associated with must be deactivated.

Alternatively, when the cell associated with the second base station is configured, the R field may be used to indicate activation / deactivation of the cell associated with the second base station.

Specifically, for example, if the R field 1108 is set to "1", it indicates that the cell associated with the second base station should be activated, and if set to "0", the cell associated with the second base station should be deactivated. Can also be displayed. In case of activating / deactivating by using the R field by adding a cell associated with the second base station under macro cell control or in cooperation with the macro cell, the cell index or SCell index associated with the second base station is not used, or the first It may be used by adding a value (for example, C8) that is not a value (for example, C1 to C7) used as the SCell index of the base station. As another example of indicating activation / deactivation of a cell associated with a second base station using the R field, when the R field 1108 is set to '1', the secondary cell of the second base station having the secondary cell index i having the Ci field (i) Indicating that a small cell) should be enabled ("1") / deactivated ("0"), and if the R field 1108 is set to "0", the secondary of the first base station with the Ci field having a secondary cell index i It may indicate that the cell should be activated / deactivated. As another example, one of the Ci fields (for example, C6 or C7) may be designated to identify the secondary cells of the first base station and the secondary cells of the second base station so as to identify the specific Ci field (for example, C6 or C7). If C7) is set to "1", another Ci field (e.g., C1, C2, C3, C4, C5) is activated for the secondary cell (small cell) of the second base station with secondary cell index i ("1"). ) / Disabled ("0"), and if the particular Ci field (e.g. C6 or C7) is set to "0", other Ci fields (e.g. C1, C2, C3, C4, C5) may indicate that the secondary cell of the master base station having the secondary cell index i should be activated / deactivated.

Alternatively, when a cell associated with the second base station is configured as described above, activation / deactivation of secondary cells of the second base station is performed so that the terminal can distinguish and identify the secondary cells of the first base station and the secondary cells of the second base station. A logical channel ID (LCID) included in a MAC PDU subheader for identifying a MAC control element, and an LCID value 11011 for identifying a MAC control element for activation / deactivation of secondary cells of the first base station; You can choose to use a different value.

In the above, a specific embodiment of activating or deactivating a cell associated with a second base station by receiving the activation related indication information from the first base station has been described.

The secondary cell of the first base station and the secondary cell of the second base station described above have been described in order to distinguish which base station is associated with each cell composed of the secondary cell in the terminal when a plurality of cells are configured in the terminal. Therefore, each of the secondary cell of the first base station and the secondary cell of the second base station may be understood as the same meaning as the cell associated with the first base station and the cell associated with the second base station.

Second Embodiment: A method using RRC signaling by a first base station.

The first base station according to another embodiment of the present invention may transmit the above-described activation related indication information to the terminal through higher layer signaling.

As described with reference to FIGS. 7 to 10, the first base station transmits activation related indication information to the terminal, and the terminal may activate or deactivate a cell associated with the second base station based on the received activation related indication information.

In this case, the present invention according to the second embodiment may transmit activation related indication information in higher layer signaling (eg, RRC signaling).

In addition, the operation of the terminal receiving the activation related indication information may operate in the same manner as described with reference to FIGS. 7 to 10.

Specifically, for example, the first base station activates or deactivates the cell associated with the second base station by transmitting information for cell activation / deactivation associated with the second base station to the terminal by including the information in an RRC connection reconfiguration message. can do. That is, an RRC connection reconfiguration message including an additional radio resource configuration of a second base station that is distinguished from the first base station is received through a cell addition / modification associated with the second base station and / or a radio bearer addition / modification procedure to the second base station. In this case, the terminal may be configured by activating or deactivating a cell associated with the second base station.

As described above, the terminal may maintain a cell deactivation timer associated with the second base station for the cell associated with the configured second base station, and deactivate the cell associated with the second base station associated with its expiry. In addition, the cell deactivation timer associated with the second base station may also be configured by RRC signaling.

As described above, when the terminal receives the indication information for activating the cell associated with the second base station through higher layer signaling, the terminal activates the cell associated with the second base station.

That is, a cell operation associated with a normal second base station (eg, SRS transmission or CQI / PMI / RI / PTI measurement report in a cell associated with that second base station or PDCCH monitoring of a cell associated with that second base station). And PDCCH monitoring for a cell associated with the second base station). And start the cell deactivation timer associated with the second base station for the cell associated with the second base station.

Meanwhile, when the terminal receives indication information for deactivating a cell associated with a second base station through higher layer signaling, the terminal deactivates a cell associated with the second base station, stops a cell deactivation timer associated with the second base station, and then performs a second base station. Flush the HARQ buffer associated with the cell associated with the.

In addition, when the cell deactivation timer associated with the second base station expires or handover command information is received through higher layer signaling, the terminal deactivates the cell associated with the second base station, stops the cell deactivation timer associated with the second base station, 2 Flush the HARQ buffer associated with the cell associated with the base station.

As described with reference to FIG. 10, when a cell associated with a second base station is activated, a PDCCH for a cell associated with a second base station indicates an uplink grant or a DL assignment or is assigned to a second base station. If the PDCCH for the serving cell scheduling the associated cell indicates an uplink grant or a DL assignment, the cell deactivation timer associated with the second base station associated with the cell associated with the second base station may be restarted. have.

Hereinafter, an operation of a first base station for a method of activating or deactivating a cell associated with a second base station according to each embodiment of the present invention described with reference to FIGS. 5 to 10 will be described.

In a method of activating or deactivating a cell associated with a second base station by a first base station according to an embodiment of the present invention, after the signaling between the first base station and the second base station, additional cell configuration information related to the second base station and the second And transmitting higher layer signaling including base station radio bearer additional modification configuration information to the terminal and receiving activation or deactivation status information of a cell associated with the second base station.

12, the first base station 1201 according to another embodiment of the present invention performs a signaling procedure with the second base station 1202 (S1210).

The above-described signaling between the first base station 1201 and the second base station 1202 may configure cell index information by distinguishing a cell associated with the first base station 1201 and a cell associated with the second base station 1202.

The first base station 1201 transmits higher layer signaling to the terminal 1203 (S1220). The higher layer signaling may include cell addition configuration information associated with the second base station 1202 and radio bearer addition modification configuration information associated with the second base station 1202 as described with reference to FIGS. 5 and 6.

The terminal 1203 may add / modify a cell associated with the second base station based on higher layer signaling, and configure at least one or more specific cells of cells associated with the second base station in an activated state. In addition, it is possible to configure a radio bearer through the second base station 1202 (S1230).

The terminal 1203 transmits information on an activated or deactivated state of a cell associated with the second base station 1202 added / modified to the first base station 1201 (S1240).

In the above, the method of the first base station for activating the cell associated with the second base station according to an embodiment of the present invention described with reference to FIGS. 5 and 6 has been described. Hereinafter, the operation of the first base station according to another embodiment of the present invention described with reference to FIGS. 7 to 10 will be described.

A method for controlling activation or deactivation of a cell associated with a second base station added by a first base station 1301 as a serving cell to a terminal 1303 according to the present invention, the activation related request information, terminal measurement report, and data state information Determining an activation or deactivation of a cell associated with a second base station added to the terminal 1303 based on at least one or more of the information, and an activation related instruction including information indicating to activate or deactivate a cell associated with the second base station And transmitting the information to the terminal 1303.

As described above, the activation related indication information according to the present invention is transmitted by being included in media access control (MAC) signaling or higher layer signaling, and the media access control signaling indicates whether the cell associated with the second base station is activated. It may include a MAC control element and / or MAC header including an indicating field (in case of the first embodiment).

Referring to FIG. 13, the first base station 1301 activates or deactivates a cell associated with a second base station added to the terminal 1303 based on at least one or more information of activation related request information, terminal measurement report, and data state information. It may be determined (S1330).

More specifically, for example, the first base station 1301 may receive activation related request information for requesting activation or deactivation of a cell associated with the second base station from the second base station 1302 (S1310). Alternatively, a terminal measurement report including information such as a signal state measured by the terminal may be received from the terminal 1303 (S1320). Alternatively, without performing steps S1310 and S1320, the first base station may determine data state information of the terminal 1303 to determine whether to activate a cell associated with the second base station.

For each case, the first base station 1301 may receive an activation related request message for activating a cell associated with the second base station according to the data state of the second base station 1302 from the second base station 1302. Can be.

Alternatively, the first base station 1301 may determine whether to activate a cell associated with the second base station according to the data state information forwarded from the first base station 1301 to the second base station 1302.

Alternatively, the first base station 1301 may determine whether to activate a cell associated with the second base station according to the measurement report of the terminal 1303.

Accordingly, steps S1310 and S1320 may or may not be executed in any order.

Thereafter, the first base station 1301 generates activation related indication information to be transmitted to the terminal 1303 according to the activation result determination result (S1340). The terminal 1303 may receive activation related indication information from the first base station 1301 (S1350), and may activate or deactivate a cell associated with the second base station based on the indication information included in the activation related indication information. (S1360).

For example, in transmitting activation related indication information, the first base station 1301 may transmit using MAC signaling or higher layer signaling.

Detailed operations of the first base station 1301 transmitting activation related indication information through MAC signaling or higher layer signaling are as described with reference to FIGS. 5 to 9.

According to another embodiment of the present invention, before the first base station 1401 transmits the activation related indication information, the second base station 1402 is configured to the second base station 1402 providing a cell associated with the second base station. The method may further include transmitting an activation related preparation message for preparing to activate or deactivate a cell associated with the base station (S1445).

Referring to FIG. 14, as described with reference to FIG. 10, the first base station 1401 may determine whether to activate a cell associated with a second base station based on at least one or more of information related to activation request information, terminal measurement report, and data state information. It may be determined (S1430).

The first base station 1401 may generate activation related indication information (S1440), and transmit an activation related preparation message to the second base station 1402 providing a cell associated with the second base station according to the determination result (S1445).

That is, the first base station 1401 may transmit an activation related preparation message for the second base station 1402 to prepare for cell activation associated with the second base station (S1445). For example, the second base station 1402 may perform an activation or deactivation preparation process for a cell associated with the second base station provided by the second base station 1402 based on the received activation related preparation message.

After the first base station 1501 according to another embodiment of the present invention transmits the activation related indication information, the second base station providing a cell associated with the second base station with a message including the activation state information of the terminal 1503. The method may further include transmitting to the base station 1502.

That is, the first base station 1501 may transmit an activation status information message to the second base station 1502 indicating that the cell associated with the second base station has been activated or deactivated.

Referring to FIG. 15, the first base station 1501 determines whether to activate a cell associated with a second base station based on at least one or more of the above-described activation related request information, terminal measurement report, and data state information (S1530).

Thereafter, the first base station 1501 generates activation related indication information (S1540) and transmits the activation related indication information generated to the terminal 1503 (S1550).

The terminal 1503 activates or deactivates a cell associated with the second base station based on the above-described activation related indication information (S1560).

The first base station 1501 is a second base station 1502 that provides a cell associated with the second base station, and is associated with a second base station provided by the second base station 1502 among the cells associated with the second base station configured in the terminal 1503. An activation state information message including information about an activation state of a cell may be transmitted (S1565). Step S1565 may be performed before step S1560, may be performed at the same time, or may be performed after step S1560 as shown in FIG.

In the above, the operation of the first base station according to the first and second embodiments has been described in more detail.

Hereinafter, an operation of the terminal and the base station will be described for another method of activating or deactivating a cell associated with the second base station to which the terminal is added.

Third embodiment: A method using MAC signaling by a second base station.

In a method for activating or deactivating a cell associated with a second base station by a second base station according to another embodiment of the present invention, in a signaling process between the first base station and the second base station, the second base station is transmitted to the terminal through the first base station. Generating higher layer signaling to transmit, and transmitting activation related indication information to the terminal, the activation related indication information including information indicating to activate or deactivate a cell associated with the second base station via a cell associated with the second base station; And transmitting the activation or deactivation status information of the cell to the first base station.

Referring to FIG. 16, the second base station 1602 transmits and receives signaling with the first base station 1601. For example, the first base station 1601 may transmit a signaling request to the second base station 1602 (S1610). The second base station 1602 may generate higher layer signaling (S1620) and transmit a signaling response to the first base station (S1625).

The signaling between the second base station 1602 and the first base station 1601 may configure cell index information by dividing a cell associated with the first base station 1601 and a cell associated with the second base station 1602.

The second base station 1602 may generate higher layer signaling to be transmitted to the terminal 1603 through the first base station 1601 (S1620). The generated higher layer signaling may be transmitted to the terminal 1603 through the first base station 1601 as described with reference to FIGS. 5 and 6 (S1630).

The terminal 1603 may configure a specific cell associated with the second base station in an activated state based on higher layer signaling (S1640). As described with reference to FIGS. 5 and 6, the specific cell configured in the activated state may be at least one cell when there are a plurality of cells associated with the second base station.

Thereafter, the second base station 1602 transmits activation related indication information to the terminal 1603 (S1650). The activation related indication information may include information indicating to activate or deactivate a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station.

In addition, as an example, the activation related indication information may be transmitted in a medium access control (MAC) signaling, and at least any one of a MAC control element and a MAC header including a field indicating whether the cell associated with the second base station is activated. It may include one.

The second base station 1602 may transmit the activation or deactivation state information of the cell associated with the second base station to the first base station 1601 (S1670).

In the above, the method in which the second base station described with reference to FIG. 16 controls whether the cell associated with the second base station is activated has been described. Hereinafter, another method of controlling whether the second base station is activated will be described in more detail with reference to FIG. 17.

Some of the methods described with reference to FIG. 17 may include operations similar to, or more specific to, the methods described with reference to FIG. 16.

In the method for the second base station 1702 according to another embodiment of the present invention to control the activation or deactivation of the cell associated with the second base station added as a serving cell to the terminal 1703, a first cell for providing a macro cell Receiving activation related indication information from the base station 1701 and receiving the activation related indication information including information indicating to activate or deactivate a cell associated with the second base station based on the activation related indication information transmission request message. And sending to 1703.

The activation related indication information according to another embodiment of the present invention is included in media access control (MAC) signaling and transmitted, and the medium access control signaling indicates whether to activate by identifying a cell associated with the second base station. It may include a MAC control element and / or MAC (sub) header including a field to.

In addition, after transmitting the activation related indication information, the second base station 1702 according to another embodiment of the present invention transmits a message including the activation state information of the terminal 1703 to the first base station 1701. It may further comprise a step.

Each step will be described in detail with reference to FIG. 17.

As described with reference to FIGS. 13 to 15, the first base station 1701 may determine whether to activate a cell associated with the second base station (S1730). In this case, activation related request information may be received from the second base station 1701 (S1710), or a terminal measurement report may be received from the terminal 1703 (S1720). Alternatively, as described above, it may be determined using only data state information. For example, when a radio bearer using both the first base station and the second base station is configured, frequent retransmission is caused in the RLC entity configured in the second base station due to the second base station load or radio quality deterioration, or a continuous problem in the physical layer. For example, when N311 consecutive "in-sync" indications are confirmed, the second base station may request deactivation from the first base station or directly transmit deactivation indication information to the terminal according to the determination of the second base station.

When the first base station 1701 determines whether to activate a cell associated with the second base station, the second base station 1702 may receive a transmission request message requesting transmission of activation related indication information from the first base station 1701. There is (S1740).

Specifically, for example, the first base station 1701 may generate a second request message for activating or deactivating a cell associated with the second base station according to a data state transmitted from the first base station 1701 to the second base station 1702. May transmit to the base station 1702.

Alternatively, the first base station 1701 may transmit a request message for activating or deactivating a cell associated with the second base station based on the measurement report of the terminal 1703 to the second base station 1702.

The second base station 1702 according to the present invention receives the above-described activation related indication information transmission request message and generates activation related indication information based on this message (S1750).

Thereafter, the second base station 1702 may transmit activation related indication information to the terminal 1703 (S1760). In more detail, the second base station 1702 may include activation related indication information in Media Access Control (MAC) signaling through a specific cell associated with the activated second base station in the second base station. Alternatively, the second base station 1702 may transmit the activation related indication information through a specific cell associated with the activated second base station in the second base station to transmit the activation or deactivation indication information of the cell associated with the above-described second base station (Media Access Control). Control, MAC) can be included in the signaling

The medium access control signaling may include a MAC control element and / or MAC (sub) header including a field indicating whether the cell associated with the second base station is activated.

Specifically, as described with reference to FIG. 11, the MAC control element including the activation related indication information transmitted by the second base station 1702 is a logical channel ID (LCID). It can be identified by a MAC Protocol Data Unit (PDU) subheader with

Specifically, as an example, the MAC control element has a fixed size and consists of a single octet including seven C-fields and one R-field.

If there is a cell associated with the second base station configured with the SCellindex or the cell index i associated with the second base station, this field is associated with the SCell or second base station with the cell index i associated with the SCell index i or the second base station. Displays the active state of the cell.

Or if there is a cell associated with the second base station configured with SCell with SCell index i, this field indicates the activation state of the cell associated with the second base station with SCeill index i or cell index i associated with the second base station.

Specifically, for example, when the Ci field is set to "1", it indicates that the cell associated with the corresponding SCell or the second base station should be activated. If set to "0", the cell associated with the corresponding SCell or the second base station is deactivated. Indicate that it should be.

Specifically, for example, when the R field is set to "1", it may indicate that the cell associated with the second base station is activated, and if it is set to "0", it may indicate that the cell associated with the second base station is deactivated. In case of activating / deactivating by using the R field by adding a cell associated with the second base station under macro cell control or in cooperation with the macro cell, the cell index or SCell index associated with the second base station is not used, or the first It may be used by adding a value (for example, C8) that is not a value (for example, C1 to C7) used as the base station SCell index. As another example of indicating activation / deactivation of a cell associated with a second base station using the R field, when the R field 908 is set to "1", the secondary cell of the second base station having the secondary cell index i having the Ci field (i) Secondary cell of the first base station with the Ci field having the secondary cell index i when the R field 908 is set to "0", indicating that it should be activated ("1) / deactivated (" 0 ") for the small cell) In another example, one of the Ci fields (for example, C6 or C7) may be distinguished from secondary cells of the first base station and secondary cells of the second base station. If the particular Ci field (e.g., C6 or C7) is set to " 1 ", the second base station with another Ci field (e.g., C1, C2, C3, C4, C5) having a secondary cell index i. It should be enabled ("1) / deactivated (" 0 ") for the secondary cell (small cell) of If the specific Ci field (e.g., C6 or C7) is set to "0", the master base station with another Ci field (e.g., C1, C2, C3, C4, C5) has a secondary cell index i. It may indicate that it should be activated / deactivated for the secondary cell of.

As described above, when the second base station 1702 transmits activation related indication information to the terminal 1703, the terminal 1703 may activate or deactivate a cell associated with the corresponding second base station based on the activation related indication information. (S1770).

Also, after the second base station 1702 according to another embodiment of the present invention transmits the activation related indication information, the second base station 1702 further transmits a message including the activation state information of the terminal to the first base station 1701. It may also include (S1775).

That is, the second base station 1702 transmits activation related indication information to the terminal 1703 and provides activation state information about a cell associated with the second base station provided by the second base station 1702 to the terminal 1703. And transmit to 1701.

The first base station 1701 may receive the corresponding information from the second base station 1702 to obtain information on the activated or deactivated state of the cell associated with the second base station.

Alternatively, the terminal 1703 may transmit information about the activated or deactivated state of the cell associated with the second base station to the first base station 1701.

As described above with reference to FIGS. 16 and 17, the terminal that receives the cell activation or deactivation indication information associated with the second base station according to the third embodiment of the present invention is the second base station as described with reference to FIGS. 5 to 10. A cell associated with may be activated or deactivated.

Specifically, the terminal maintains a cell deactivation timer associated with the second base station for the cell associated with the configured second base station. And deactivates the cell associated with the second base station associated with its expiry. The cell deactivation timer associated with the second base station may be configured by RRC signaling. Because the non-ideal backhaul delay between the master base station and the second base station may prevent the first base station from quickly checking the information on the activation state of the second base station secondary cell, the above deactivation timer is the second cell deactivation timer (sCellDeactivationTimer). Fields other than -r10) can be defined and configured.

When the terminal receives the MAC CE including activation related indication information for activating a cell associated with the second base station in this TTI for each transmission time interval (TTI) and a cell associated with each configured second base station, 2 Activates the cell associated with the base station. Alternatively, in consideration of the non-ideal backhaul delay between the first base station and the second base station, the terminal may transmit a cell associated with the second base station to this TTI for a cell associated with each transmission time interval (TTI) and each configured second base station. Receiving activation related indication information for activating the TTI, after the non-ideal backhaul delay time between the first base station and the second base station in the TTI (or the non-ideal backhaul delay time between the first base station and the second base station in this TTI) After twice the time, activate the cell associated with the second base station (TTI). The backhaul delay time may be configured by higher layer signaling by the first base station.

Cell operations associated with a normal second base station (e.g., an SRS transmission or CQI / PMI / RI / PTI measurement report or a cell associated with that second base station in a cell associated with that second base station) PDCCH monitoring, etc. for the cell associated with the. And start the cell deactivation timer associated with the second base station associated with the cell associated with the second base station. As described above, when the cell deactivation timer associated with the second base station expires, the cell associated with the second base station may be deactivated.

If the terminal receives the MAC CE including deactivation indication information, the terminal deactivates the cell associated with the second base station in the TTI, stops the cell deactivation timer associated with the second base station and is associated with the cell associated with the second base station. Flush the HARQ buffer.

Or if the cell deactivation timer associated with the second base station expires at this TTI, the terminal deactivates the cell associated with the second base station in the TTI, stops the cell deactivation timer associated with the second base station, and the HARQ associated with the cell associated with the second base station. Flush the buffer.

Alternatively, when the terminal receives the higher layer signaling including the handover command information, the terminal is configured to consider the cell associated with the second base station configured in the lower layer as an inactive state.

That is, when the terminal receives an RRC connection reconfiguration message including mobility control information from the first base station, the terminal is associated with a second base station configured with a cell or SCell associated with the second base station in a lower layer. Configure the cell to be considered inactive. The terminal may keep the cell associated with the second base station in an inactive state until receiving the cell activation indication information associated with the second base station.

Alternatively, when the small cell is activated, the PDCCH for the small cell indicates an uplink grant or downlink assignment, or the PDCCH for the serving cell for scheduling the small cell is an uplink grant. ) Or DL assignment, the cell deactivation timer associated with the second base station associated with the small cell may be restarted.

In the above, a case in which the present invention is applied to a case where a cell associated with a second base station is added / modified to a terminal has been described with reference to the drawings.

The present invention is not only a case where a cell associated with a second base station is added / modified as described above, but also a data radio bearer for user plane data transmission through a second base station to a terminal together with cell addition / modification associated with a second base station. This may also apply to cases where DRB) is added / modified. The above-described cell addition / modification associated with the second base station associated with the second base station and radio bearer addition / modification through the second base station may be provided through one procedure. That is, when the first base station determines user data transmission through the second base station, through the signaling between the first base station and the second base station, the cell addition / modification associated with the second base station associated with the second base station and / or the second base station radio Bearers can be configured. Hereinafter, a procedure of adding / modifying a data radio bearer by determining a user plane data transmission through a second base station by a first base station according to the present invention will be described.

If the first base station determines user plane data transmission through the second base station or through the first base station and the second base station (e.g., decides to add / modify DRBs to the second base station), then the first base station A message is sent to the base station to request bearer setup for user plane data transmission. Or, it sends a message for requesting bearer setup for DRBs setup. A message (eg, a second base station bearer add / modify request message or a second base station add / modify request message) for requesting bearer setup for user plane data transmission through a second base station includes at least one of the following information: can do.

■ Message Type: Contains information to identify the procedure type of the message. The above-described message may be a message for requesting addition / modification of a second base station radio bearer to the same message for requesting cell addition / modification associated with the second base station.

■ Cell ID associated with the second base station: Contains E-UTRAN Cell Global Identifier (ECGI) of the cell associated with the second base station or cell PCI (Physical Cell ID) information associated with the second base station.

■ terminal context information

◆ Terminal Security capabilities: Contains information about the algorithms supported for encryption and integrity protection in the terminal, the algorithms supported for encryption in the terminal, or the algorithms supported for encryption of user plane data in the terminal. Alternatively, the terminal security capabilities information may be managed only at the first base station without being included in the bearer establishment request message.

AS Security Information or AS Security Key: A base station key (K _UPenc ) for _deriving encryption key (K _UPenc ) information for user plane data at a second base station or a user plane data at a second base station (K _UPenc ). Base station) information. The above-described value may use the same value as K _UPenc or the base station key (K base station) of the first base station. Alternatively, when the first base station transmits user data through the second base station, when the second base station performs only the RLC / MAC / PHY function except for the PDCP, the AS base station may not include the AS security information or the AS security key information. .

◆ UE Aggregate Maximum Bit Rate: A maximum bit rate set to be applied to all Non-GBR bearers per UE, defined in the up or down direction, and provided to the first base station by the MME. Alternatively, the UE-AMBR information may be managed only by the first base station without being included in the bearer establishment request message. (For example, it may be applied when the user base station forwards user plane data through the second base station.)

◆ Terminal Capability Information: Terminal capability information necessary for configuring radio resources for user data transmission through a second base station among terminal capability information included in the terminal context information received through the MME. , Single transmission / reception (single Tx / Rx) or multiple transmission / reception (multi Tx / Rx).

◆ E-RARAN Radio Access Bearers (E-RABs) To Be Setup List

● E-RABs setup item

√ E-RAB ID: Contains information for identifying a radio access bearer for the terminal.

√ E-RAB Level QoS Parameters: Quality of Service (QoS) information applied to the E-RAB and includes QCI, Allocation and Retention Priority, and GBR QoS information.

√ GTP Tunnel Endpoint: When transmitting user plane data through an interface between a first base station and a second base station, the IP of the first base station as an endpoint of a bearer for transmitting user plane data between the first base station and the second base station. Includes transport layer address and GTP TEID (Tunnel Endpoint ID) information.

Alternatively, in case of transmitting user plane data through the interface between the S-GW and the second base station, the transport layer address and the GTP TEID (Tunnel Endpoint ID), which are IP addresses of the S-GWB, as endpoints between the S-GW and the second base station. It includes.

Upon receiving the bearer establishment request message for user plane data transmission or DRBs establishment from the first base station, the second base station sends a message to the first base station in response to the bearer establishment request. The message for responding to the bearer establishment request may include at least one of the following information.

■ Message Type: Contains information to identify the procedure type of the message. The above-described message may be a message for requesting the addition / modification of a second base station radio bearer to the same message as the message for responding to the request for cell addition / modification associated with the second base station.

■ E-RARAN radio access bearers (E-RABs) accepted list (E-RABs Admitted List) through the second base station

◆ E-RABs acceptance item

E-RAB ID: includes information for identifying a radio access bearer for the terminal.

GTP Tunnel Endpoint: When user plane data is transmitted through an interface between a first base station and a second base station, the GTP tunnel tunnel endpoint includes information about an endpoint of a bearer for transmitting user plane data between the first base station and the second base station.

Alternatively, when user plane data is transmitted through the interface between the S-GW and the second base station, the transport layer address and the GTP TEID (Tunnel Endpoint ID), which are IP addresses of the second base station, as endpoints between the S-GW and the second base station. It includes.

DRB ID: Contains information about the DRB identifier.

● PDCP-Config: Contains PDCP configuration information. In another method, user data is transmitted from a first base station to a second base station through a radio bearer that simultaneously uses radio resources of the first base station and the second base station, and only the RLC / MAC / PHY functions except the PDCP are transmitted from the second base station. When performing the above-mentioned PDCP-CONFIG information is not included.

● RLC-Config: Contains RLC configuration information.

● logicalChannelIdentity: Contains information about logical channel identifier.

● logicalChannelConfig: Contains information about logical channel configuration information.

◆ E-RABs unacceptable list

◆ Optional dedicated RACH preamble

After the first base station completes a signaling procedure for bearer configuration information for transmitting user plane data or establishing DRBs with the second base station (eg, a message for responding to the aforementioned bearer establishment request from the second base station) After reception), the RRC connection reconfiguration message may be transmitted to the UE by including DRBs information to be added / modified from the second base station. The terminal adds / modifies the second base station and the DRBs for user plane data transmission, modifies the DRBs of the first base station to the DRBs of the second base station, or adds the DRBs that simultaneously use radio resources of the first base station and the second base station. Or modify or add / modify DRBs of the first base station to DRBs that simultaneously use radio resources of the first base station and the second base station.

The aforementioned DRBs information to be added / modified may include at least one or more of the following information.

■ EPS-Beareridentity: An EPS bearer identifier that contains information about the E-RAB ID.

■ Cell Identifier: Contains information about a Physical Cell ID (PCI) and an Absolute Radio Frequency Channel (ARFCN) of a cell associated with a second base station.

■ Cell index or SCell index or the second base station index / classification information associated with the second base station: the index / classification information for indicating that the DRB configured in the terminal is a radio bearer through the second base station or the DRB configured in the terminal is the first Index / classification information for indicating that the radio bearer using the radio resources of the base station and the second base station at the same time.

DRB-ID: Contains information on the DRB-ID received from the second base station.

PDCP-Config: Contains information on PDCP-Config received from the second base station.

■ RLC-Config: Contains information about the RLC-Config received from the second base station.

■ logicalChannelIdentity: Contains information about logical channel identifier.

■ logicalChannelConfig: Contains information about logical channel configuration information.

Alternatively, the first base station initiates a bearer setup signaling procedure for transmitting user plane data or establishing DRBs with the second base station (e.g., after transmitting the aforementioned bearer setup request message to the second base station). ), And may include the DRBs information to be added / modified in the RRC Connection Reconfiguration message to the terminal. The terminal may add / modify the second base station and the DRBs for user plane data transmission, or may modify the DRBs of the first base station to the DRBs of the second base station.

The DRBs information to be added / modified may include at least one of the following information.

EPS-Beareridentity: Contains information about the use of E-RAB ID as EPS bearer identifier.

■ Second base station index: cell index or SCell index or second base station index / classification information associated with the second base station: index / classification information for indicating that the DRB configured in the terminal is a radio bearer through the second base station or configured in the terminal It indicates the index / classification information for indicating that the DRB is a radio bearer using the radio resources of the first base station and the second base station at the same time.

DRB-ID: Contains information on the DRB-ID determined by the first base station and delivered to the second base station.

PDCP-Config: Contains information about PDCP-Config determined by the first base station and delivered to the second base station.

■ RLC-Config: Contains information about the RLC-Config determined by the first base station and delivered to the second base station.

Alternatively, the DRB information to be added / modified or the DRB information to be released may include identification information for distinguishing a cell and a macro cell associated with the second base station. For example, when adding / modifying DRBs previously configured through the first base station through the second base station, information on the DRB to be added / modified may include the second base station identifier / index / division information.

In addition, the DRB information to be released in the macrocell may be included in the information on the DRB to be released (DRB-ToAddMod) together with the macrocell identifier.

Alternatively, the DRB to be added / modified may include a cell index or SCell or second base station index / division information associated with the second base station described above.

Parameters (eg, PDCP configuration information, RLC configuration information, and MAC configuration information) included in the above-mentioned RRC Connection Reconfiguration message are initial context setup request messages received from the MME. It can be set based on.

In more detail, information (for example, E-RABs list) in an initial context setup request message may be forwarded through a request message for setting up a bearer, and the second base station may be configured based on this information. The second base station may send the configured parameter information to the first base station to include in the RRC Connection Reconfiguration message.

In another method, the parameters (eg, PDCP configuration information, RLC configuration information, and MAC configuration information) included in the RRC Connection Reconfiguration message may include information in the Initial Context Setup Request message received from the MME (eg, E- RABs list) may be determined by the first base station.

Alternatively, the parameters included in the RRC Connection Reconfiguration message may include information in the Initial Context Setup Request message received from the MME and a message for responding to the bearer setup request from the second base station. The first base station may be set based on this.

In addition, the first base station is a cell identification information for allowing the terminal to synchronize to the cell associated with the second base station and access to the cell associated with the second base station through a random access channel (Random Access Chennel, RACH), radio of the cell It can be transmitted including the resource configuration information.

The radio resource configuration information of the small cell described above is UE-specific for operation in a cell system information, a random access channel preamble, and a secondary cell (small cell) associated with a second base station received through a message for responding to a bearer establishment request. It may include configuration information.

In the above description, for example, the related information for small cell access is transmitted through higher layer signaling, but may be transmitted in a separate step from the higher layer signaling.

The terminal receives higher layer signaling (eg, an RRC connection reconfiguration message) including the radio resource configuration information of the small cell, and then synchronizes with the second base station. If the dedicated random access channel preamble information is included, the random access procedure may be performed according to the "contention-free" procedure. Or, if the dedicated random access channel preamble is not included, the random access procedure is performed according to the "contention-based" procedure.

The above-described higher layer signaling (eg, an RRC connection reconfiguration message) may include small cell information to be added / modified, DRBs information to be added / modified, and information for performing synchronization and random access in one message. Each of the above-mentioned information may be included in a separate message and transmitted.

In addition, as described above, the procedure of adding, modifying, or removing a cell associated with a second base station or adding, modifying, or removing DRBs through a second base station by a first base station for transmitting user plane data through the second base station is described. In determining, the first base station may determine using information (eg, an E-RAB Level QoS parameter) in an Initial Context Setup Request message received from the MME. The DRB to be serviced through the first base station and the DRB to be serviced through the second base station may be determined to initiate bearer setup signaling for the user plane data transmission to the second base station. That is, the first base station transmits the E-RAB to be transmitted through the second base station in consideration of the first base station load, measurement report information, etc. based on QoS parameters (QCI, Allocation and Retention Priority, GBR QoS) for each E-RAB. You can choose.

For example, a GBR bearer or an E-RAB having a specific QCI or a specific Allocation and Retention Priority value may be transmitted through the first base station and may not request DRB establishment from the second base station.

When there are unaccepted E-RABs in the aforementioned bearer establishment response message, the first base station may set user DRBs by setting DRBs through the first base station.

The first base station may perform the above-described DRBs addition / modification procedure when the cell associated with the second base station is activated in the terminal or with the cell activation associated with the second base station. For example, in order to transmit data through additional radio resources of a second base station, which is distinguished from a first base station based on a terminal measurement report, the first base station is configured to transmit the data through signaling between the first base station and the second base station. When the cell addition / modification information associated with the 2 base station and the second base station radio bearer addition / modification information are delivered to the terminal through higher layer signaling, the terminal first activates a cell associated with the second base station according to the received higher layer signaling. And add / modify DRBs through the second base station (or through the first base station and the second base station). In case of the UE before release 11, when the secondary cell receives the addition / modification information and the radio bearer addition / modification information, the radio cell is configured first so that the secondary cell can be quickly communicated, and then the secondary cell is deactivated. did. After that, the terminal activates the secondary cell in consideration of the data state and used the secondary cell. However, when receiving the cell addition / modification information and the radio bearer addition / modification information associated with the second base station, first configure a cell associated with the second base station in an active state so that communication can be performed quickly through the second base station. It may be effective to configure the radio bearer in the second base station.

Alternatively, the DRBs add / modify procedure may be executed and cell activation / deactivation associated with the second base station may be performed. For example, when DRBs are added, after first configuring the radio bearer, the cell associated with the second base station may be configured to be in an inactive state and activate a cell associated with the second base station according to the data state of the cell associated with the second base station. Or when a DRBs are added, the cell associated with the second base station is configured to be active and is configured to display a cell associated with the second base station associated with the second base station according to the data state of the cell associated with the second base station or the cell deactivation timer associated with the second base station. You can also disable it.

Alternatively, the specific cell associated with the second base station may be configured to be always active regardless of the above-described DRBs addition / modification procedure. For example, the specific cell associated with the second base station for transmitting activation or deactivation indication information of the cell associated with the second base station may be configured to be activated until the cell is released and / or until the handover message is received. . Alternatively, when the first (one) cell associated with the second base station is added, the cell may be configured to be activated until the cell is released and / or until the handover message is received.

In another method, one of the secondary cells included in the second base station (small cell) is configured with radio bearers (DRBs) for transmitting the user plane data, and the handover and / or handover is performed. The specific cell associated with the second base station may be configured to be always activated until the message is received. The terminal is always active until at least one of the secondary cells (small cells) of the second base station configured with radio bearers (DRBs) for user plane data transmission is released until the cell is released and / or a handover message is received. It can be configured as. For example, the inactivity timer value may be configured to a very large value, or a cell associated with a new second base station in which radio bearers (DRBs) for user plane data are configured is configured, or all secondary cells of the second base station are removed. You can always keep it active before. In order to distinguish the specific cell of the second base station to be activated to transmit the activation or deactivation indication information of the cell associated with the second base station, the upper layer signaling message is assigned to the second base station radio bearer in the secondary cell configuration information (RadioResourceConfigDedicatedSCell). Activation of a cell associated with the second base station by including a second base station secondary cell index that may include or distinguish configuration information, or remains active until the cell is released and / or until a handover message is received; The deactivation indication information may be provided including specific cell indication information of the second base station. In addition, if a secondary cell is added to other secondary cell (s) of the second base station other than the cell associated with the second base station configured to be always activated, the secondary cell is added without configuring the radio bearers (DRBs) for user plane data transmission (eg, For example, when the second base station secondary cell is added, the radio bearer configuration information is not included), the terminal may be configured to be in an inactive state, and the activation / deactivation by the above-described first base station or the second base station may be possible.

The operation of the terminal, the first base station and the second base station according to each embodiment of the present invention described above will be briefly described.

In addition, the terminal according to another embodiment of the present invention provides activation-related indication information including information for instructing to activate or deactivate a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station through the second base station. The method may further include controlling to activate or deactivate a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station based on the receiving step and the activation related indication information.

That is, as described with reference to FIGS. 5 and 6, the terminal according to the present invention configures a cell associated with the second base station based on higher layer signaling received from the first base station, but at least one specific cell is activated. Can be configured.

In addition, it is possible to control activation or deactivation of a cell distinguished from a specific cell configured in an activated state among cells associated with the configured second base station by receiving activation related indication information from the second base station. The detailed procedure is as described with reference to FIGS. 5 and 6.

In another embodiment, in a method for activating or deactivating a cell associated with a second base station when a terminal adds a cell associated with a second base station as a serving cell, a macrocell is provided. Receiving activation related indication information including information indicating to activate or deactivate a cell associated with the second base station from any one of the base stations providing the cell associated with the first base station and the second base station; do.

As described above, the terminal may receive activation related indication information from the first base station through MAC signaling or higher layer signaling. In addition, activation related indication information may be received from the second base station through MAC signaling.

In addition, the MAC signaling may include a MAC control element and / or a MAC header including a field indicating whether the cell associated with the second base station is activated.

Thereafter, the terminal according to an embodiment of the present invention includes controlling the cell associated with the second base station to be activated or deactivated based on the activation related indication information.

As described above, the terminal may activate or deactivate a cell associated with the corresponding second base station based on information included in the activation related indication information.

Specifically, as described with reference to FIGS. 7 to 11, the cell associated with the second base station may be activated and the cell inactivity timer associated with the second base station may be started. Or deactivate the cell associated with the second base station, stop the cell deactivation timer associated with the second base station, and delete the HARQ.

Other terminals may perform operations of the terminal required for the implementation of the present invention described with reference to FIGS. 5 to 17.

In a method for activating or deactivating a cell associated with a second base station, the first base station according to another embodiment of the present invention, after the signaling between the first base station and the second base station additional cell configuration information associated with the second base station And transmitting the higher layer signaling including the second base station radio bearer additional modification configuration information to the terminal and receiving activation or deactivation state information of a cell associated with the second base station.

That is, the first base station transmits the cell addition modification configuration information associated with the second base station and the second base station radio bearer addition modification configuration information to the terminal, and the terminal may add / modify the cell associated with the second base station based thereon. In addition, a radio bearer associated with the second base station may also be added / modified.

Also, the first base station may receive state information including information on activation or deactivation of a cell associated with the second base station from the terminal or the second base station.

In another embodiment, a method for controlling activation or deactivation of a cell associated with a second base station added as a serving cell to a terminal by a first base station according to the present invention, the activation related request information, terminal measurement report, and data state information Determining activation or deactivation of a cell associated with a second base station added to the terminal based on at least one of the information.

As described above, the cell activation related request information associated with the second base station may be received and determined from the second base station, or may be determined based on the terminal measurement report received from the terminal. In addition, it may be determined whether the cell associated with the second base station is activated based on the data state information.

In addition, before the first base station according to the present invention transmits the activation related indication information as described above, the second base station provides a cell associated with the second base station. The method may further include transmitting an activation related preparation message to prepare for deactivation.

In addition, the first base station according to the present invention includes the step of transmitting the activation-related indication information including the information indicating to activate or deactivate the cell associated with the second base station.

In detail, as described above, the first base station may transmit activation related indication information through MAC signaling or higher layer signaling.

Also, before transmitting the activation related indication information, the first base station according to the present invention allows the second base station to prepare for activation or deactivation of the cell associated with the second base station to the second base station providing the cell associated with the second base station. The method may further include transmitting an activation related preparation message for performing the step.

In addition, after the first base station according to the present invention transmits the activation-related indication information, further comprising the step of transmitting a message containing the activation status information of the terminal to the second base station providing a cell associated with the second base station It may be.

In addition, after the first base station according to the present invention determines the activation or deactivation of the cell associated with the second base station, the cell associated with the second base station sends an activation related indication information request message to request the activation related indication information to be transmitted. The method may further include transmitting to a second base station that provides a.

In this case, the activation related indication information may be transmitted by the second base station to the terminal.

In a method for activating or deactivating a cell associated with a second base station by a second base station according to another embodiment of the present invention, higher layer signaling to be transmitted to a terminal through a first base station after signaling between the first base station and the second base station Transmitting activation related indication information to the terminal and generating activation related instructions including information indicating to activate or deactivate a cell associated with the second base station through a cell associated with the second base station; And transmitting the deactivation status information to the first base station.

That is, the second base station generates higher layer signaling including additional modification configuration information of the cell associated with the second base station and radio bearer additional modification configuration information of the cell associated with the second base station, and transmits it to the terminal through the first base station. Can be. In this case, the second base station may transmit the generated higher layer signaling information to the first base station, and the first base station may transmit the received information to the terminal through higher layer signaling.

In addition, the second base station generates activation-related indication information for controlling the activation or deactivation of the cell associated with the second base station configured in the terminal and transmits it to the terminal.

Thereafter, the second base station transmits status information of activation or deactivation of the cell associated with the second base station configured in the terminal to the first base station.

In another embodiment, a method for controlling activation or deactivation of a cell associated with a second base station added as a serving cell to a terminal by a second base station according to the present invention, the activation-related indication from a first base station providing a macro cell And receiving an information transmission request message.

Also, the second base station according to the present invention may include transmitting activation related indication information including information indicating to activate or deactivate a cell associated with the second base station based on the activation related indication information transmission request message to the terminal. have.

In this case, the second base station may transmit activation related indication information in MAC signaling.

In addition, the second base station according to the present invention may further include transmitting a message including activation status information of the terminal to the first base station after transmitting the activation related indication information.

The terminal, the first base station, and the second base station described above may perform all of the operations described with reference to FIGS. 5 to 17.

18 and 19 will be briefly described with reference to the configuration of the base station and the terminal.

The method of the present invention described with reference to FIGS. 5 to 17 may be implemented by both the base station and the terminal to be described below.

Referring to FIG. 18, a user terminal 1800 according to another embodiment of the present invention includes a receiver 1810, a controller 1820, and a transmitter 1830.

The receiver 1810 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the receiver 1810 may receive higher layer signaling from the first base station, and the higher layer signaling may include cell additional modification configuration information associated with the second base station. As described above, the cell addition modification configuration information associated with the second base station may include cell information for transmitting activation or deactivation indication information of a cell associated with the second base station or cell information to be kept in an activated state.

In addition, the receiver 1810 receives activation related indication information from the second base station.

In another embodiment, the receiver 1810 may receive MAC signaling or higher layer signaling including activation related indication information from the first base station or the second base station. In addition, the receiver 1810 may receive higher layer signaling including handover command information.

The controller 1820 controls the overall operation of the terminal required to perform the control operation associated with cell activation or deactivation associated with the second base station of the terminal required to perform the present invention described above.

In more detail, the controller 1820 may configure a specific cell associated with the second base station in an active state based on higher layer signaling and configure a radio bearer. In addition, the cell associated with the second base station may be activated or deactivated according to the received activation-related indication information. In another embodiment, the controller 1820 may activate / deactivate the cell associated with the second base station according to the received activation-related indication information, stop the cell activation / deactivation timer associated with the second base station, and delete the HARQ. have.

In addition, the overall operation of the terminal described with reference to FIGS. 5 to 17 may be controlled.

The transmitter 1830 transmits uplink control information, data, and a message to a base station through a corresponding channel.

In addition, the transmitter 1830 may communicate with the second base station or transmit activation or deactivation state information of a cell associated with the second base station to the first base station.

Referring to FIG. 19, a base station 1900 according to another embodiment of the present invention includes a controller 1910, a transmitter 1920, and a receiver 1930.

First, a first base station according to an embodiment of the present invention will be described.

The controller 1910 determines whether to activate the cell associated with the second base station required to perform the above-described present invention and controls the overall operation of the base station according to transmitting higher layer signaling or activation related indication information.

The transmitter 1920 and the receiver 1930 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

In more detail, the transmitter 1920 may transmit higher layer signaling including cell additional modification configuration information associated with the second base station to the terminal.

In another embodiment, activation related indication information may be transmitted, and the information may be transmitted through MAC signaling or higher layer signaling.

In addition, the receiver 1930 may receive state information including information on an activation or deactivation state of a cell associated with the second base station from the terminal or the second base station.

In another embodiment, the receiver 1930 may receive an activation related request message from the second base station or a terminal measurement report from the terminal.

In addition, all the roles according to the operation of the first base station described with reference to FIGS. 5 to 17 may be performed.

Next, a second base station according to another embodiment of the present invention will be described.

The control unit of the second base station may control the overall operation of the base station according to the transmission of the activation-related indication information of the cell associated with the second base station required to carry out the present invention described above.

Also, the receiving unit of the second base station may receive an activation related indication information transmission request message from the first base station.

In addition, the transmitter of the second base station may transmit activation related indication information to the terminal or transmit cell activation state information associated with the second base station of the terminal to the first base station.

In addition, all operations of the second base station described with reference to FIGS. 5 to 17 may be performed.

As described above, according to the present invention, the cell associated with the second base station under the control of the macro cell to the serving cell for transmitting user data traffic in an environment in which an ideal backhaul is established between the first base station and the second base station. Add. Thereafter, the cell associated with the second base station may be activated / deactivated according to the user data traffic. In addition, by maintaining the SCell configured with a specific cell associated with the second base station in an active state, it is possible to offload user data traffic to a cell associated with the second base station while reducing terminal battery consumption or enabling data transmission without a delay caused by activation. It works.

That is, when the present invention is applied, there is an effect of providing a method and apparatus for a terminal to add a cell associated with a second base station as a secondary cell and to activate or deactivate a cell associated with the added second base station.

The present invention also provides a method and apparatus for controlling activation or deactivation of a small cell added to a terminal by a first base station providing a macro cell or a second base station providing a small cell, thereby reducing power consumption of the terminal. And it is effective to provide a small cell on / off method and apparatus for data traffic.

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 changes 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 idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with a patent application number 10-2013-0015384 filed in Korea on February 13, 2013 and a patent application number 10-2013-0129872 filed in Korea on October 30, 2013 and December 2013. Patent Application No. 10-2013-0149687, filed with Korea on April 04, claims priority pursuant to Article 119 (a) (35 USC § 119 (a)), all of which are incorporated by reference. Incorporated into the application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

A method for enabling a terminal to activate or deactivate a cell associated with a second base station,

Receiving higher layer signaling received through the first base station after signaling between a first base station and the second base station;

Configuring a specific cell associated with the second base station to an activated state; And

Configuring a radio bearer via the second base station.
The method of claim 1,

Receiving activation related indication information including information instructing to activate or deactivate a cell distinguished from a specific cell configured to the activated state among cells associated with the second base station through the second base station; And

And controlling a cell distinguished from a specific cell configured in the activated state from among cells associated with the second base station to be activated or deactivated based on the activation related indication information.
The method of claim 2,

The activation related indication information,

Media access control (MAC) signaling included in the reception,

And at least one of a MAC control element and a MAC header including a field indicating whether to activate a cell distinguished from a specific cell configured to the activated state among cells associated with the second base station.
The method of claim 1,

Signaling between the first base station and the second base station,

And classifying a cell associated with the first base station and a cell associated with the second base station to configure cell index information.
The method of claim 1,

Configuring the specific cell associated with the second base station to an active state

At least one of the cells associated with the second base station is configured to be in an activated state.
The method of claim 1,

The higher layer signaling includes cell addition modification configuration information associated with the second base station;

The cell addition modification configuration information associated with the second base station includes cell information to transmit activation or deactivation indication information of a cell associated with the second base station or cell information to be kept in an activated state.
A method for activating or deactivating a cell associated with a second base station by a first base station, the method comprising:

After signaling between the first base station and the second base station, transmitting higher layer signaling including cell additional modification configuration information associated with the second base station and second base station radio bearer additional modification configuration information to the terminal; And

Receiving activation or deactivation status information of a cell associated with the second base station.
The method of claim 7, wherein

Signaling between the first base station and the second base station,

And classifying a cell associated with the first base station and a cell associated with the second base station to configure cell index information.
A method for activating or deactivating a cell associated with a second base station by a second base station,

Generating higher layer signaling to be transmitted to a terminal through the first base station in a signaling process between a first base station and the second base station;

Transmitting activation related indication information to the terminal through information associated with the second base station, the information related to activating or deactivating a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station; And

Transmitting activation or deactivation status information of a cell associated with the second base station to the first base station.
The method of claim 9,

The signaling between the first base station and the second base station is

And classifying a cell associated with the first base station and a cell associated with a second base station to configure cell index information.
The method of claim 9,

The activation related indication information,

Included in the Media Access Control (MAC) signaling and transmitted,

And at least one of a MAC control element and a MAC header including a field indicating whether to activate a cell distinguished from a specific cell configured to the activated state among cells associated with the second base station.
A terminal for activating or deactivating a cell associated with a second base station,

A receiver configured to receive higher layer signaling received through the first base station after signaling between a first base station and the second base station;

A controller configured to configure a specific cell associated with the second base station in an activated state; And

And a control unit configured to configure a radio bearer through the second base station.
The method of claim 12,

The receiving unit,

Further receiving activation related indication information including information instructing to activate or deactivate a cell distinguished from a specific cell configured to the activated state among cells associated with the second base station through the second base station,

The control unit,

The terminal further controls to activate or deactivate a cell distinguished from a specific cell configured to the activated state among cells associated with the second base station based on the activation related indication information.
The method of claim 13,

The activation related indication information,

Media access control (MAC) signaling included in the reception,

And at least one of a MAC control element and a MAC header including a field indicating whether to activate a cell distinguished from a specific cell configured to the activated state among cells associated with the second base station.
The method of claim 12,

Signaling between the first base station and the second base station,

And distinguishing a cell associated with the first base station and a cell associated with the second base station to configure cell index information.
The method of claim 12,

The higher layer signaling includes cell addition modification configuration information associated with the second base station;

The cell addition modification configuration information associated with the second base station includes cell information for transmitting activation or deactivation indication information of a cell associated with the second base station or cell information to be kept in an activated state.
A first base station for activating or deactivating a cell associated with a second base station,

A controller configured to generate higher layer signaling including cell additional modification configuration information associated with the second base station and second base station radio bearer additional configuration information after signaling between the first base station and the second base station;

A transmitter for transmitting the higher layer signaling to a terminal; And

And a receiver configured to receive activation or deactivation status information of a cell associated with the second base station.
The method of claim 17,

Signaling between the first base station and the second base station,

And a cell index information configured to distinguish a cell associated with the first base station and a cell associated with the second base station.
A second base station for activating or deactivating a cell associated with a second base station,

A controller configured to generate higher layer signaling to be transmitted to a terminal through the first base station in a signaling process between a first base station and the second base station;

A transmitter for transmitting activation related indication information including information indicating to activate or deactivate a cell distinguished from a specific cell configured in an activated state among cells associated with the second base station through a cell associated with the second base station; And

And a transmitter for transmitting the activation or deactivation status information of the cell associated with the second base station to the first base station.
The method of claim 19,

Signaling between the first base station and the second base station,

And a cell index information configured to distinguish a cell associated with the first base station and a cell associated with the second base station.