KR20140147507A

KR20140147507A - Apparatus and method for configuring carrier aggregation in wireless communication system

Info

Publication number: KR20140147507A
Application number: KR20130070884A
Authority: KR
Inventors: 한문용
Original assignee: 엘지전자 주식회사
Priority date: 2013-06-20
Filing date: 2013-06-20
Publication date: 2014-12-30

Abstract

The present invention relates to a wireless communication system and, more particularly, to an apparatus and a method for configuring multiple carriers of a terminal. The present invention discloses a configuration of actively configuring carrier aggregation by performing a cell measurement on a secondary serving cell having radio resource information similar to that of a primary serving cell set to be connected to a terminal, without RRC signaling, or by checking length information of a downlink cyclic prefix with respect to the additionally configured secondary serving cell. Thus, by properly detecting data symbols transmitted in the secondary serving cell through the checked length information of the downlink cyclic prefix with respect to the secondary serving cell or the cell measurement, a plurality of frequency bands can be used like a single band, and thus, a high data transfer rate is supported and system performance is satisfied.

Description

[0001] APPARATUS AND METHOD FOR CONFIGURING CARRIER AGGREGATION IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to an apparatus and method for setting up carrier aggregation.

Recently, LTE (Long Term Evolution) system, a next generation wireless communication system, has been commercialized in earnest. This LTE system is spreading more rapidly after recognizing the need to support high-quality services for voice services as well as high-capacity services for users' needs while ensuring the activity of terminal users. The LTE system provides low transmission delay, high data rate, system capacity and coverage improvement.

To this end, the LTE system supports carrier aggregation (CA). The CA refers to supporting a plurality of carriers, and is also referred to as spectrum aggregation or bandwidth aggregation. Here, each individual unit carrier bundled by carrier aggregation is referred to as an element carrier (CC). Each element carrier is defined as the bandwidth and center frequency.

That is, CA is introduced to support increased system throughput, prevent cost increase due to the introduction of a wideband radio frequency (RF) device, and ensure compatibility with existing systems. For example, If five element carriers are allocated as the granularity of a unit carrier with a bandwidth, it can support a bandwidth of up to 25 MHz. Actually, such an LTE system proposes to support a system bandwidth of 100 MHz as a service requirement. For this purpose, a specific method for allocating bandwidth between an uplink and a downlink is discussed.

Meanwhile, the CA setting is performed through radio resource control (RRC) signaling. Therefore, if the UE does not receive necessary information according to the characteristics of the RRC signaling, the UE has a restriction problem that it can not perform the corresponding operation itself or can not set the CA correctly. As a result, the terminal can not actively cope with the service request, thereby causing the service delay. Therefore, a more efficient CA configuration scheme is required in the LTE system.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for setting up multiple carriers of a terminal in a wireless communication system.

It is another object of the present invention to provide an apparatus and method for setting up a multicarrier carrier using a downlink cyclic prefix length in a wireless communication system.

It is another object of the present invention to provide an apparatus and method for performing a multicarrier setting on at least one serving cell in a wireless communication system.

According to an aspect of the present invention, there is provided a method of setting up a multicarrier of a terminal in a wireless communication system, the method comprising: performing RRC connection establishment through a main serving cell; Comprising the steps of: receiving RRC Connection Reconfiguration (RRC Connection Reconfiguration) including configuration information for at least one or more secondary serving cells through the RRC connection reconfiguration message; and receiving configuration information for the at least one or more secondary serving cells in the RRC connection reconfiguration message, The method comprising the steps of: obtaining a downlink synchronization for a secondary serving cell by checking a Cyclic Prefix corresponding to the cell; and supporting a service through the primary serving cell and the at least one secondary serving cell, .

According to another aspect of the present invention, there is provided a terminal apparatus for setting up a multicarrier in a wireless communication system, the terminal apparatus comprising: a radio processing unit for transmitting and receiving a radio signal; (RRC) connection reconfiguration (RRC) reconfiguration including configuration information for a secondary serving cell, and transmits configuration information for the at least one or more secondary serving cells in the RRC connection reconfiguration message or downlink And a processor for checking the Cyclic Prefix to obtain downlink synchronization for the corresponding secondary serving cell and supporting the service through the primary serving cell and the at least one secondary serving cell.

And has the advantage of supporting a service requirement of a terminal for data transmission by constituting a plurality of carriers. Particularly, since a secondary serving cell having a channel quality similar to that of a main serving cell connected to a mobile station can be actively used without additional RRC signaling, a service such as using a band of a large band through a plurality of bands It provides the advantage of supporting quality. Also, the information in the symbols transmitted from the secondary serving cell can be detected through the length information of the downlink cyclic prefix for the secondary serving cell, which is additionally provided, thereby providing an advantage of efficiently supporting a high data rate for data transmission .

1 is a diagram schematically illustrating a structure of a next generation wireless communication system to which the present invention is applied.
2 is a diagram illustrating the structure of a radio frame to which the present invention is applied.
FIG. 3 is a view showing a resource grid to which the present invention is applied.
4 is a block diagram illustrating a wireless protocol structure for a control plane to which the present invention is applied.
FIG. 5 is a diagram illustrating a structure for carrier aggregation to which the present invention is applied.
6 is a diagram illustrating a procedure for setting up carrier aggregation according to an embodiment of the present invention.
7 is a diagram illustrating a procedure for setting up carrier aggregation according to an embodiment of the present invention.
8 is a block diagram briefly showing a structure of a wireless communication system according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

The present invention will be described with reference to a communication network. The work performed in the communication network may be performed in a process of controlling the network and transmitting data by a system (e.g., a base station) that manages the communication network, The work can be done.

1 is a schematic view illustrating a structure of a next generation wireless communication system to which the present invention is applied. This discloses the network structure of an E-UMTS (Evolved-Universal Mobile Telecommunications System). The E-UMTS system is called a LTE (Long Term Evolution) or LTE-A (advanced) system and is a packet-based system for providing various communication services such as voice and packet data.

Referring to FIG. 1, an E-UTRAN includes a base station 20 (eNB) that provides a control plane and a user plane to a user equipment (UE) 10. The terminal 10 may be fixed or mobile and may be referred to by other terms such as a mobile station (MS), an advanced MS (MS), a user terminal (UT), a subscriber station (SS) .

The base station 20 generally refers to a station that communicates with the terminal 10 and includes a base station (BS), a base transceiver system (BTS), an access point, a femto-eNB, A pico-eNB, a home eNB, a relay, or the like. The base station 20 can provide services to the terminal through at least one cell. The cell may mean a geographical area where the base station 20 provides communication services, or may refer to a specific frequency band. A cell may denote a downlink frequency resource and an uplink frequency resource. Or a cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource. In this regard, in the LTE system, it is possible to provide an effect similar to the use of one large band band logically by bundling a plurality of physically continuous or non-continuous bands in the frequency domain, To provide high data rate.

The base stations 20 may be interconnected via an X2 interface. The base station 20 is connected to an S-GW (Serving Gateway) through an MME (Mobility Management Entity) and an S1-U through an EPC (Evolved Packet Core) 30, more specifically, an S1-MME through an S1 interface. The S1 interface exchanges OAM (Operation and Management) information to support the movement of the terminal 10 by exchanging signals with the MME.

The EPC 30 includes an MME, an S-GW, and a Packet Data Network-Gateway (P-GW). The MME has information on the connection information of the terminal 10 and the capability of the terminal 10. This information is mainly used for managing the mobility of the terminal 10. [ The S-GW is a gateway having an E-UTRAN as an end point, and the P-GW is a gateway having a PDN (Packet Data Network) as an end point.

The E-UTRAN and the EPC 30 may be combined to form an EPS (Evolved Packet System), and the traffic flow from the wireless link to the base station 20 to the PDN connecting the terminal 10 to the service entity (Internet Protocol).

The wireless interface between the terminal and the base station is called a Uu interface. The layers of the radio interface protocol between the UE and the network are classified into L1 (first layer), L1 (second layer), and the like based on the lower three layers of the Open System Interconnection (OSI) A physical layer belonging to a first layer provides an information transfer service using a physical channel, and a physical layer (physical layer) An RRC (Radio Resource Control) layer located at Layer 3 controls the radio resources between the UE and the network. A specific description of the RRC layer will be described with reference to FIG. The physical layer may operate in a TDD (Time Division Duplex) scheme using different time periods or an FDD (Frequency Division Duplex) scheme using different frequencies in an uplink transmission and a downlink transmission.

2 is a diagram illustrating the structure of a radio frame to which the present invention is applied.

Referring to FIG. 2, one radio frame includes ten subframes, and one subframe includes two consecutive slots. The time (length) for transmitting one subframe is called a transmission time interval (TTI). For example, the length of one subframe (1 subframe) may be 1 ms and the length of one slot may be 0.5 ms.

Further, one slot may include a plurality of symbols in the time domain. For example, in the case of a wireless system using Orthogonal Frequency Division Multiple Access (OFDMA) in the downlink, the symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol. On the other hand, the representation of the symbol period of the time domain is not limited by the multiple access scheme or the name. For example, in a time domain, a plurality of symbols may be a single-carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, etc. in addition to an OFDM symbol.

The 1, 2, 3 (or 4) OFDM symbols preceding the first slot in the subframe are control channel regions to which a physical downlink control channel (PDCCH) is mapped, The symbols are data channel regions to which a physical downlink shared channel (PDSCH) is mapped. The control channel region may be referred to as a control region, and the data channel region may be referred to as a data region. In addition to the PDCCH, a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), and the like may be allocated to the control region.

Here, the PDCCH includes an uplink grant informing the UE of a paging channel (PCH), a resource allocation of a downlink shared channel (DL-SCH), hybrid automatic repeat request (HARQ) (uplink grant). Accordingly, the UE can decode the PDCCH and correctly read the data information transmitted on the PDSCH. In addition, the PCFICH notifies the number of OFDM symbols constituting the control region in the subframe, and is transmitted every subframe. For example, when the system bandwidth is N ^DL _RB > 10, the PCFICH indicates the first one, two or three OFDM symbols as a control region, and when N ^DL _RB ≤ 10, the PCFICH indicates the first two, , Three or four OFDM symbols are indicated as control areas. The PHICH carries an HARQ ACK / NAK signal in response to an uplink transmission.

FIG. 3 is a view showing a resource grid to which the present invention is applied.

Referring to FIG. 3, a resource block (RB) is a unit for allocating resources, and includes time-frequency resources corresponding to 180 kHz on a frequency axis and 1 slot on a time axis. A resource element (RE) represents a smallest time-frequency unit to which a modulation symbol of a data channel or a modulation symbol of a control channel is mapped. If there are M subcarriers on one OFDM symbol and one slot includes N OFDM symbols, one slot includes MxN resource elements.

In addition, the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP). For example, one slot includes seven OFDM symbols in the case of a normal (or normal) CP, and one slot may include six OFDM symbols in case of an extended CP. Therefore, one slot includes a plurality of subcarriers in the frequency domain and seven (or six) OFDM symbols in the time domain.

For example, if the RB includes 12 subcarriers in the frequency domain, one resource block may include 7 x 12 resource elements (REs). The resource block may be referred to as a PRB (Physical Resource Block).

4 is a block diagram illustrating a wireless protocol structure for a control plane to which the present invention is applied. The user plane is a protocol stack for transmitting user data, and the control plane is a protocol stack for transmitting control signals. Although the user plane is not shown in the present invention, the physical layer, the MAC layer, the RLC layer, and the PDCP layer, which will be described below, are configured in the user plane to perform similar operations for data transmission.

Referring to FIG. 4, a physical layer (PHY) layer 410 provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the air interface. Data is transferred between the different physical layers, that is, between the transmitter and the physical layer of the receiver through a physical channel. The physical channel can be modulated by the OFDM scheme, and uses time and frequency as radio resources.

In addition to the PDCCH, PCFICH, and PHICH described in FIG. 2, physical control channels existing in the physical layer include a Physical Uplink Control Channel (MAC) channel for carrying uplink control information such as HARQ ACK / NAK for downlink transmission, A physical uplink control channel (PUCCH), and a physical uplink shared channel (PUSCH) for carrying an uplink shared channel (UL-SCH).

The function of the MAC layer 420 is to perform the mapping between the logical channel and the transport channel and the multiplexing / demultiplexing to the transport block provided on the physical channel on the transport channel of the MAC SDU (service data unit) belonging to the logical channel . The MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel. The logical channel can be divided into a control channel for transferring control area information and a traffic channel for transferring user area information.

The function of RLC layer 430 includes concatenation, segmentation and reassembly of RLC SDUs. In order to guarantee various QoS (Quality of Service) required by a radio bearer (RB), the RLC layer includes Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode , And AM). AM RLC provides error correction via automatic repeat request (ARQ).

The functions of the Packet Data Convergence Protocol (PDCP) layer 440 include transmission of user data, header compression, and ciphering. The function of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes transmission of control plane data and encryption / integrity protection.

The RRC layer 450 performs functions such as broadcasting, paging, RRC connection management, RB control, mobility, and UE measurement of system information related to the NAS / AS. In particular, temporary ID assignment and radio resource setting for RRC connection are performed for setting up, managing, and releasing RRC connection between UE and E-UTRAN. That is, it is responsible for the control of the logical channels, the transport channels and the physical channels in connection with the configuration, re-configuration and release of the RBs. RB means a logical path provided by a first layer (PHY layer) and a second layer (MAC layer, RLC layer, PDCP layer) for data transmission between a UE and a network. The configuration of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and an operation method. The RB may be further classified into an SRB (Signaling RB) and a DRB (Data RB). The SRB is used as a path for transmitting the RRC message and the NAS message in the control plane, and the DRB is used as a path for transmitting the user data in the user plane.

In addition, the RRC layer 450 manages the mobility function of the UE through measurement for inter-cell mobility and mobility between RAT (Radio Access Technology), inter-cell handover, UE cell selection and reselection, context transfer between eNBs, .

The Non-Access Stratum (NAS) layer 460 located at the top of the RRC layer performs functions such as session management and mobility management. That is, regarding the mobility management of the terminal, the terminal performs estimation, authentication, security (security key, control for encryption / protection) and the like. To this end, the network assigns a temporary ID to the terminal, . With respect to the registration procedure of the terminal, it is possible to perform procedures such as Attach / Detach / Tracking Area Update. Also, regarding the bearer setup for the service, it is possible to perform procedures for activating / deactivating the UE and the bearer resource / EPS bearer. The NAS message is transmitted between the MME and the eNB through the S1-AP, and transmitted between the eNB and the UE through the RRC message.

5 is a view schematically showing a definition of a CA to which the present invention is applied.

Referring to FIG. 5, carrier aggregation can be divided into contiguous carrier aggregation between non-contiguous element carriers in the frequency domain and non-contiguous carrier aggregation between discontinuous element carriers. The number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink element carriers is equal to the number of uplink element carriers is referred to as symmetric aggregation and the case where the number of downlink element carriers is different is referred to as asymmetric aggregation. In a multi-carrier system, adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used, and either symmetric aggregation or asymmetric aggregation may be used.

In addition, the size (i.e. bandwidth) of the element carriers may be different. For example, if five element carriers are used for a 70 MHz band configuration, then 5 MHz element carrier (carrier # 0) + 20 MHz element carrier (carrier # 1) + 20 MHz element carrier (carrier # 2) + 20 MHz element carrier (carrier # 3) + 5 MHz element carrier (carrier # 4).

The element carrier can be divided into a fully configured carrier and a partially configured carrier depending on the directionality. The pre-set carrier indicates a carrier capable of transmitting and / or receiving all control signals and data in a bidirectional carrier, and the partially set carrier indicates a carrier capable of transmitting only downlink data on a unidirectional carrier. The partial set carrier may be mainly used for MBS (Multicast and broadcast service) and / or SFN (Single Frequency Network).

The main serving cell 505 refers to one serving cell that provides security input and NAS mobility information in the RRC establishment or re-establishment state.

Also, depending on capabilities, the terminal may be configured such that at least one cell forms a set of serving cells together with a main serving cell 505, the at least one cell is referred to as a secondary serving cell 520 . Accordingly, the set of serving cells set for one UE may consist of only one main serving cell 505, or may consist of one main serving cell 505 and at least one secondary serving cell 520. [

Adjacent cells 515 and 525 within the frequency of the neighboring cells 500 and 510 and / or the sub-serving cell 520 within the frequency of the main serving cell 505 belong to the same carrier frequency. The adjacent cells 530, 535, and 540 between the frequencies of the main serving cell 505 and the secondary serving cell 520 belong to different carrier frequencies.

The downlink component carrier corresponding to the main serving cell 505 is referred to as a downlink main carrier wave (DL PCC) and the uplink component carrier corresponding to the main serving cell 505 is referred to as an uplink main carrier wave (UL PCC). In the downlink, an elementary carrier corresponding to the secondary serving cell 520 is referred to as a downlink sub-element carrier (DL SCC), and an elementary carrier corresponding to the secondary serving cell 520 in the uplink is referred to as an uplink sub- Carrier (UL SCC). Only one downlink component carrier may correspond to one serving cell or a downlink component carrier and an uplink component carrier may correspond to each other.

The PCC is a CC in which the UE initially establishes a connection (RRC connection) with the UE among the plurality of CCs. The PCC is a special CC for managing connections (connection or RRC connection) for signaling about a plurality of CCs and managing UE context information, which is connection information related to the UEs. In addition, the PCC is connected to the terminal and is always active when the RRC is connected. Meanwhile, the SCC is a CC allocated to a terminal in addition to the PCC. The SCC can be divided into an activated or deactivated state where the terminal is an extended carrier extended for additional resource allocation in addition to the PCC. The initial state of the SCC is inactive.

The main serving cell 505 and the secondary serving cell 520 have the following characteristics.

First, the main serving cell 505 is used for transmission of the PUCCH.

Second, the primary serving cell 505 is always active, while the secondary serving cell 520 is a carrier that is activated / deactivated according to certain conditions.

Thirdly, when the main serving cell 505 experiences a radio link failure (RLF), the RRC reconnection is triggered. However, when the secondary serving cell 520 experiences RLF, the RRC reconnection is triggered It does not.

Fourth, the main serving cell 505 may be changed by a security key change or a handover procedure accompanied by a RACH (Random Access CHannel) procedure.

Thus, procedures such as reconfiguration, addition and removal of the auxiliary serving cell 520 can be performed by the RRC layer. In the addition of the new secondary serving cell 520, the transmission of the system information of the dedicated secondary serving cell may use RRC signaling.

As described above, the UE can configure one main serving cell or one main serving cell and at least one or more secondary serving cells as a serving cell set according to its capabilities, and the configuration for the secondary serving cell is There is always a restriction to be reset / added / removed through the RRC message. Accordingly, in the present invention, a method for actively setting a CA to a terminal when configuring the secondary serving cell is disclosed.

6 is a diagram illustrating a procedure for setting up carrier aggregation according to an embodiment of the present invention.

Referring to FIG. 6, in step 610, the terminal 601 performs an RRC connection establishment with the base station 605. In particular, temporary ID assignment and radio resource setting for RRC connection are performed for setting, managing, and releasing RRC connection between the UE and the network. This includes being able to perform the operations mentioned in the RRC layer. In step 610, the RRC connection setup procedure is performed by the BS 605 to transmit an RRCConnectionSetup message to the MS and an RRCConnectionSetupComplete message to the BS by the MS. At this time, the delay required for transmitting and receiving the messages between the UE and the BS is defined as N = 15, and N is defined as the number of 1ms subframes. Herein, the initial RRC connection setup between the UE and the BS is performed through the main serving cell.

Meanwhile, the UE can support a user service through bandwidth extension using one or more secondary serving cells, as a UE capable of supporting CA. Accordingly, the base station 605 may transmit an RRC connection reconfiguration message to the UE for changing the main serving cell or adding / changing / releasing the secondary serving cell for cell management. That is, for the secondary serving cell, the E-UTRAN, i.e., the base station 605, can transmit all relevant system information for operation of the added secondary serving cell via dedicated signaling. At this time, the change of the related system information of the secondary serving cell is performed through the RRC connection reconfiguration message. This is the same as step 620.

Table 1 below shows a message of RRCConnectionReconfiguration as an example. An information element indicated by the following optional information indicates that an item / condition needs to be set in the terminal by the base station . If the item is set, RRC signaling should be accompanied by a separate information element for the item.

- ASN1START

RRCConnectionReconfiguration :: = SEQUENCE {
rrc-TransactionIdentifier RRC-TransactionIdentifier,
criticalExtensions CHOICE {
c1 CHOICE {
rrcConnectionReconfiguration-r8 RRCConnectionReconfiguration-r8-IEs,
spare7 NULL,
spare6 NULL, spare5 NULL, spare4 NULL,
spare3 NULL, spare2 NULL, spare1 NULL
},
criticalExtensionsFuture SEQUENCE {}
}
}

RRCConnectionReconfiguration-r8-IEs :: = SEQUENCE {
measConfig MeasConfig OPTIONAL, - Need ON
mobilityControlInfo MobilityControlInfo OPTIONAL, - Cond HO
dedicatedInfoNASList SEQUENCE (SIZE (1..maxDRB)) OF
DedicatedInfoNAS OPTIONAL, - Cond nonHO
radioResourceConfigDedicated RadioResourceConfigDedicated OPTIONAL, - Cond HO-toEUTRA
securityConfigHO SecurityConfigHO OPTIONAL, - Cond HO
nonCriticalExtension RRCConnectionReconfiguration-v890-IEs OPTIONAL - Need OP
}

RRCConnectionReconfiguration-v890-IEs :: = SEQUENCE {
lateNonCriticalExtension OCTET STRING OPTIONAL, - Need OP
nonCriticalExtension RRCConnectionReconfiguration-v920-IEs OPTIONAL - Need OP
}

RRCConnectionReconfiguration-v920-IEs :: = SEQUENCE {
otherConfig-r9 OtherConfig-r9 OPTIONAL, - Need ON
fullConfig-r9 ENUMERATED {true} OPTIONAL, - Cond HO-Reestab
nonCriticalExtension RRCConnectionReconfiguration-v1020-IEs OPTIONAL - Need OP
}

RRCConnectionReconfiguration-v1020-IEs :: = SEQUENCE {
sCellToReleaseList-r10 SCellToReleaseList-r10 OPTIONAL, - Need ON
sCellToAddModList-r10 SCellToAddModList-r10 OPTIONAL, - Need ON
nonCriticalExtension RRCConnectionReconfiguration-v1130-IEs OPTIONAL - Need OP
}

RRCConnectionReconfiguration-v1130-IEs :: = SEQUENCE {
systemInfomationBlockType1Dedicated-r11 OCTET STRING (CONTAINING SystemInformationBlockType1) OPTIONAL, - Need ON
nonCriticalExtension SEQUENCE {} OPTIONAL - Need OP
}

SCellToAddModList-r10 :: = SEQUENCE (SIZE (1..maxSCell-r10)) OF SCellToAddMod-r10

SCellToAddMod-r10 :: = SEQUENCE {
sCellIndex-r10 SCellIndex-r10,
cellIdentification-r10 SEQUENCE {
physCellId-r10 PhysCellId,
dl-CarrierFreq-r10 ARFCN-ValueEUTRA
} OPTIONAL, - Cond SCellAdd
radioResourceConfigCommonSCell-r10 RadioResourceConfigCommonSCell-r10 OPTIONAL, - Cond SCellAdd
radioResourceConfigDedicatedSCell-r10 RadioResourceConfigDedicatedSCell-r10 OPTIONAL, - Cond SCellAdd2
...,
[[dl-CarrierFreq-v1090 ARFCN-ValueEUTRA-v9e0 OPTIONAL-Cond EARFCN-max
]]
}

SCELLToReleaseList-r10 :: = SEQUENCE (SIZE (1..maxSCell-r10)) OF SCellIndex-r10

SecurityConfigHO :: = SEQUENCE {
handoverType CHOICE {
intraLTE SEQUENCE {
securityAlgorithmConfig SecurityAlgorithmConfig OPTIONAL, - Cond fullConfig
keyChangeIndicator BOOLEAN,
nextHopChainingCount NextHopChainingCount
},
interRAT SEQUENCE {
securityAlgorithmConfig SecurityAlgorithmConfig,
nas-SecurityParamToEUTRA OCTET STRING (SIZE (6))
}
},
...
}

- ASN1STOP

Here, with respect to the configuration of the secondary serving cell, the UE receives the RRCConnectionReconfiguration including the 'SCellToAddMod' item and can set the CA through the 'SCellToAddMod' item. Particularly, the EUTRA for indicating the index information (sCellIndex) for the secondary serving cell, the physical cell ID (PhysCellId) of the corresponding cell in the cell identification information (cellIdentification), and the DL carrier frequency (dl-CarrierFreq) Confirms the information on the absolute value (ARFCN-ValueEUTRA) for identification, and sets the CA.

As described above, the CA setup is performed by configuring a secondary serving cell in addition to the main serving cell having the RRC connection to increase the data throughput of the UE, i.e., performing data transmission using channels having a plurality of frequencies . At this time, if the information about the resource block applied for data transmission in the secondary serving cell is not recognized, the data can not be received properly, which results in failure to guarantee data performance. In other words, it can not be said that CA is properly set up.

To this end, the UE according to the present invention includes a step of performing cell attachment without a separate RRC message including a MeasConfig item from a base station, and setting a CA in consideration of the DL CP . This is for solving the restriction of performing cell handling after receiving a separate RRC message including an existing MeasConfig item. Herein, the CP is a guard interval for reducing interference between channels of each frequency. If the CP is unknown, the UE can not acquire the DL synchronization, and an error occurs in the OFDM symbol received in the corresponding serving cell. The probability increases. Therefore, in the present invention, the UE performs cell attachment using information on the configuration of the secondary serving cell, and performs channel setting for data transmission in the secondary serving cell using the DL CP detected through the cell access And then sets the CA.

According to the present invention, cell attachments can be performed without receiving a separate RRC message because measuement objects indicating an object for performing a handling in a corresponding serving cell are classified according to the RAT type Considering such characteristics, the secondary serving cell is regarded as a cell having a similar radio resource nature only to a center frequency different from that of the main serving cell managed by the base station. do. Accordingly, the UE can transmit the RRC message to the secondary serving cell, without receiving a separate MeasConfig for performing the ranging, i.e., in the condition that the RRC message for the configuration of the presence including the ranging object for the added secondary serving cell is not received, And confirms the detected DL CP as a result of the performance, thereby acquiring DL synchronization with the secondary serving cell. This is the same as step 630.

The UE transmits to the base station through the RRC Connection Complete Complete message that the CA setup for the secondary serving cell is normally completed. This is the same as step 640. Thus, data is transmitted and received through the main serving cell and the at least one secondary serving cell to guarantee the quality of data service of the user.

Therefore, according to the present invention, the UE performs cell attachment without receiving a separate RRC message for detecting the DL CP of the secondary serving cell before CA establishment, using only the configuration information of the secondary serving cell, that is, CA Performing cell interference on the configuration prevents a delay in the reception of additional RRC messages.

7 is a diagram illustrating a procedure for setting up carrier aggregation according to another embodiment of the present invention.

Referring to FIG. 7, in step 710, the terminal 701 performs RRC connection establishment with the base station 705. Hereinafter, step 710 RRC connection establishment procedure is the same as step 610 described above.

Then, the BS 705 transmits an RRC connection reconfiguration message including the configuration information of the added secondary serving cell to the MS for the CA for the MS. At this time, the RRC connection reconfiguration message includes DL CP information of the secondary serving cell, thereby allowing the UE to immediately set the CA without performing additional cell interference. This is to save time required for cell handling for detecting the DL CP of the secondary serving cell shown in FIG. 6, i.e., to prevent a delay in CA setup. The RRCConnectionReconfiguration message is configured as shown in Table 2 below. That is, RRC signaling is performed in a form including an information element for the DL CP.

SCellToAddModList-r10 :: = SEQUENCE (SIZE (1..maxSCell-r10)) OF SCellToAddMod-r10

SCellToAddMod-r10 :: = SEQUENCE {
sCellIndex-r10 SCellIndex-r10,
cellIdentification-r10 SEQUENCE {
physCellId-r10 PhysCellId,
dl-CarrierFreq-r10 ARFCN-ValueEUTRA
} OPTIONAL, - Cond SCellAdd
RadioResourceConfigCommonSCell-r10 :: = SEQUENCE {
- DL configuration as well as configuration for DL and UL
nonUL-Configuration-r10 SEQUENCE {
- 1: Cell characteristics
dl-Bandwidth-r10 ENUMERATED {n6, n15, n25, n50, n75, n100}
- 2: Physical configuration, general
antennaInfoCommon-r10 AntennaInfoCommon,
mbsfn-SubframeConfigList-r10 MBSFN-SubframeConfigList OPTIONAL, - Need OR
- 3: Physical configuration, control
phich-Config-r10 PHICH-Config,
- 4: Physical configuration, physical channels
pdsch-ConfigCommon-r10 PDSCH-ConfigCommon,
dl-CyclicPrefixLength-r10 DL-CyclicPrefixLength,
tdd-Config-r10 TDD-Config OPTIONAL - Cond TDDSCell

Therefore, the UE uses the 'SCellToAddMod' item related to the configuration of the secondary serving cell for CA setup in the RRC connection reconfiguration message and the information about the radio resource configuration (RadioResourceConfigCommonScell) for the secondary serving cell, DL synchronization is obtained by using the DL CP described in the 'dl-CyclicPrefixLength' field according to the following equation. This is the same as step 720.

The UE transmits to the base station through the RRC connection reconfiguration complete message that the CA setup for the secondary serving cell is successfully completed. This is the same as step 730.

Therefore, according to the present invention, by receiving the RRCConnectionReconfiguration including the DL CP according to the present invention, the time required for the cell access, that is, the time required for detecting the DL CP, can be saved, and the CA setup can be performed more quickly. Accordingly, the UE can improve the data transmission rate through one main serving cell and at least one or more auxiliary serving cells, thereby ensuring service quality.

8 is a block diagram briefly showing a structure of a terminal according to the present invention.

Referring to FIG. 8, a terminal 800 includes a radio signal processing unit (RF unit) 810, a processor 820, and a memory 830. The RF processor 810 is connected to the processor 820 and transmits / receives a radio signal.

The processor 820 is an entity for performing functions, procedures, methods, and the like according to the present invention, and performs the operations of FIGS. 6 to 7 of the present invention. That is, when the UE requests quality of service (QoS) requesting a high transmission rate, it receives an RRC connection reconfiguration message including a DL CP type for a channel setup procedure for CA setup from the network, To acquire the DL synchronization and set the CA immediately. Or performing configuration of a cell for performing DL CP detection by itself without receiving a message for performing a separate access using the configuration information for the secondary serving cell, Satisfies the quality.

Here, the processor 820 confirms the DL CP defined in correspondence with each serving cell and aligns DL synchronization with the corresponding serving cell. 6 of the present invention. That is, the number of symbols in one slot used in service support in the corresponding serving cell is confirmed through the DL CP, and data is properly transmitted and received. That is, it checks the CP set to prevent interference with other serving cells and controls transmission / reception of data.

The memory 830 is connected to the processor 820 and includes information for supporting all operations of the processor 820. [

Meanwhile, the base station 850 includes a radio signal processing unit (RF unit) 860, a processor 880, and a memory 870. The RF processor 860 is connected to the processor 880 and transmits / receives a radio signal.

The processor 880 is an entity for performing functions, procedures, and methods according to the present invention, and performs an operation according to FIG. 7 of the present invention. That is, for the CA setup of the terminal 800, an RRC connection reconfiguration message including DL CP type is transmitted. The memory 870 is connected to the processor 880 and includes information for supporting all the operations of the processor 880.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims

A method of setting a multi-carrier of a terminal in a wireless communication system,
Performing a radio resource control (RRC) connection establishment through a main serving cell,
Receiving RRC Connection Reconfiguration (RRC Connection Reconfiguration) including configuration information for at least one or more secondary serving cells through the main serving cell;
At least one of the configuration information for the at least one or more secondary serving cells in the RRC connection reconfiguration message and the downlink cyclic prefix corresponding to the secondary serving cell is checked to obtain downlink synchronization for the corresponding serving cell And,
And supporting the service through the main serving cell and the at least one secondary serving cell.

2. The method of claim 1,
Wherein the RRC connection reconfiguration message includes index information for a corresponding serving cell in the RRC connection reconfiguration message under a condition that an RRC message for a configuration including a ranging object indicating an object performing performing with respect to the secondary serving cell is not received and performing a cell interference using information on a frequency identification value for indicating a physical cell ID (PhysCellId) and a carrier frequency (dl-Carrier Frequency) for the downlink, / RTI >

3. The method as claimed in claim 2,
And acquiring synchronization with the secondary serving cell using a downlink cyclic prefix detected through the cell access.

2. The method of claim 1,
In a state in which cell attachment is not performed without receiving an RRC message for a ranging structure including a ranging object indicating an object performing a ranging for the at least one or more secondary serving cells, the RRC connection reconfiguration message And acquiring downlink synchronization using a downlink cyclic prefix corresponding to the sub-serving cell in the second sub-serving cell.

5. The method of claim 4, wherein the downlink cyclic prefix (Cyclic Prefix)
Denotes a length of a cyclic prefix that defines the number of symbols included in one slot,
Wherein the downlink cyclic prefix is defined for the secondary serving cell.

A terminal apparatus for setting up a multi-carrier in a wireless communication system,
A radio processing unit for transmitting and receiving a radio signal,
(RRC) reconfiguration (RRC Connection Reconfiguration) message including configuration information for at least one or more secondary serving cells received through a main serving cell, Wherein the at least one of the main serving cell and the at least one of the at least one serving cell and the at least one of the at least one serving cell and the at least one serving cell, And a processor for supporting a service through a secondary serving cell of the terminal.

7. The apparatus of claim 6,
Wherein the RRC connection reconfiguration message includes index information for a corresponding serving cell in the RRC connection reconfiguration message under a condition that an RRC message for a configuration including a ranging object indicating an object performing performing with respect to the secondary serving cell is not received and a frequency identification value for indicating a carrier frequency (dl-Carrier Frequency) for the downlink, based on a physical cell ID (PhysicalCellId), a Physical Cell ID .

7. The apparatus of claim 6,
And acquires synchronization with the secondary serving cell by using a downlink cyclic prefix detected through the cell access.

7. The apparatus of claim 6,
In a state in which cell attachment is not performed without receiving an RRC message for a ranging structure including a ranging object indicating an object performing a ranging for the at least one or more secondary serving cells, the RRC connection reconfiguration message And a downlink synchronization is obtained by using a downlink cyclic prefix corresponding to the secondary serving cell in the uplink sub-carrier.

7. The apparatus of claim 6,
Characterized in that a downlink synchronization is obtained by checking the number of symbols included in one slot defined for the secondary serving cell by using the downlink cyclic prefix, Device.

A method for setting up a multi-carrier of a base station in a wireless communication system,
Performing RRC connection establishment with a UE through a main serving cell,
(RRC Connection Reconfiguration) including at least one of configuration information for at least one serving cell and a Cyclic Prefix (Cyclic Prefix) corresponding to the at least one secondary serving cell;
Transmitting the configured RRC connection reconfiguration message to the MS through the main serving cell;
And supporting the service through the main serving cell and the at least one secondary serving cell.

The method of claim 11, wherein the step of configuring the RRC Connection Reconfiguration comprises:
(SCellIndex), a physical cell ID (PhysCellId), and a frequency identification value for indicating a carrier frequency (dl-CarrierFreq) for the downlink, as configuration information for the secondary serving cell , &Lt; / RTI >
Wherein the cyclic prefix includes a length of a cyclic prefix defining a number of symbols included in one slot defined for the secondary serving cell in the DL cyclic prefix.