JP6276051B2 - Mobile station, base station and communication method - Google Patents

Description

  The present invention relates to a mobile station, a base station, and a communication method. In particular, the present invention relates to mobile stations and base stations that communicate by applying carrier aggregation, and also relates to a communication method in these mobile stations and base stations.

  In the LTE (Long Term Evolution) system, two duplex modes (Duplex mode) are defined, which are a frequency division duplex (FDD) scheme and a time division duplex (TDD) scheme. . In the FDD scheme, uplink communication and downlink communication are executed in different frequency bands, and in the TDD scheme, uplink communication and downlink communication are separated by time in the same frequency band. In the TDD scheme, the time ratio assigned to uplink communication / downlink communication is not limited to 1: 1, and different ratios can be used (see Non-Patent Document 1).

3GPP TS 36.211 V12.0.0 (2013-12)

  In the TDD system defined in the current LTE system, seven types of time ratios are defined as time ratios assigned to uplink communication / downlink communication. FIG. 1 shows subframes assigned to downlink communication and uplink communication in a TDD LTE system. As shown in FIG. 1, which subframes are specifically assigned to uplink communication / downlink communication is defined (UL-DL configuration 0-6).

  On the other hand, in the LTE-Advanced system, carrier aggregation (CA) that realizes high throughput using a plurality of component carriers (CC: Component Carrier) has been studied. In particular, when the amount of downlink data is large, it is assumed that higher throughput can be realized by setting the component carrier of the secondary cell set by carrier aggregation to only downlink communication.

  In addition, when the amount of uplink data is large, it is also conceivable to set the component carrier of the secondary cell set by carrier aggregation only to uplink communication.

  Furthermore, even in the FDD scheme, it is assumed that higher throughput can be realized by setting the component carrier of the secondary cell set by carrier aggregation to only downlink communication or only uplink communication.

  In the case of the TDD scheme, it is possible to newly define a time ratio (for example, UL-DL configuration 7) in which all subframes are allocated to downlink communication in the subframe configuration of FIG. An object of the present invention is to realize communication in which the component carrier of the secondary cell is set to either one of downlink communication or uplink communication when the component carrier of the secondary cell is added.

A mobile station according to an aspect of the present invention is:
A mobile station that communicates by applying carrier aggregation,
A receiver that receives a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
In accordance with the received message, a component carrier setting unit that sets the component carrier of the secondary cell;
I have a,
When the predetermined information item in the message received by the receiving unit is not set, the component carrier setting unit sets the component carrier of the secondary cell to either downlink communication or uplink communication .
A mobile station according to an aspect of the present invention is
A mobile station that communicates by applying carrier aggregation,
A mobile capability notification section for notifying the mobile capability indicating whether the mobile station supports downlink communication or uplink communication;
A receiver that receives a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
In accordance with the received message, a component carrier setting unit that sets the component carrier of the secondary cell;
Have
The mobile functional capability notification unit notifies the mobile functional capability as a mobile functional capability for each frequency band supported by the mobile station or as a mobile functional capability for all frequency bands supported by the mobile station.

A base station according to an aspect of the present invention is:
A base station that communicates by applying carrier aggregation,
A component carrier setting unit that adds a component carrier of the secondary cell and generates a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication;
A transmitter for transmitting the generated message to the mobile station;
I have a,
The component carrier setting unit causes the mobile station to set the component carrier of the secondary cell to either one of downlink communication or uplink communication, so that the message is set without setting a predetermined information item in the message. Is generated .
In addition, a base station according to one aspect of the present invention is
A base station that communicates by applying carrier aggregation,
A mobile capability management unit that manages mobile capability indicating whether the mobile station supports downlink communication or uplink communication; and
Component carrier setting for adding a component carrier of the secondary cell and generating a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication based on the managed mobile capability And
A transmitter for transmitting the generated message to the mobile station;
Have
The mobile functional capability management unit manages the mobile functional capability as a mobile functional capability for each frequency band supported by the mobile station, or as a mobile functional capability for all frequency bands supported by the mobile station.

A communication method according to an aspect of the present invention includes:
A communication method in a mobile station that communicates by applying carrier aggregation,
Receiving a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
Setting the component carrier of the secondary cell according to the received message;
I have a,
In the setting step, when a predetermined information item in the received message is not set, the component carrier of the secondary cell is set to either downlink communication or uplink communication .
In addition, a communication method according to an aspect of the present invention includes:
A communication method in a mobile station that communicates by applying carrier aggregation,
A step of notifying mobile capability indicating whether or not the mobile station supports communication of either downlink communication or uplink communication;
Receiving a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
Setting the component carrier of the secondary cell according to the received message;
Have
In the step of notifying, the mobile functional capability is notified as a mobile functional capability for each frequency band supported by the mobile station or as a mobile functional capability for all frequency bands supported by the mobile station.

A communication method according to an aspect of the present invention includes:
A communication method in a base station that communicates by applying carrier aggregation,
Adding a component carrier of the secondary cell, and generating a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication;
Sending the generated message to the mobile station;
I have a,
In the generating step, in order to cause the mobile station to set the component carrier of the secondary cell to either downlink communication or uplink communication, the message is transmitted without setting a predetermined information item in the message. Generate .
In addition, a communication method according to an aspect of the present invention includes:
A communication method in a base station that communicates by applying carrier aggregation,
Managing the mobile capability indicating whether the mobile station is compatible with either downlink communication or uplink communication; and
Adding a component carrier of the secondary cell, and generating a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication based on the managed mobility capability; and
Transmitting the generated message to the mobile station;
Have
In the managing step, the mobile functional capability is managed as a mobile functional capability for each frequency band supported by the mobile station or as a mobile functional capability for all frequency bands supported by the mobile station.

  ADVANTAGE OF THE INVENTION According to this invention, when the component carrier of a secondary cell is added, it becomes possible to implement | achieve the communication which set the component carrier of the secondary cell to either downlink communication or uplink communication.

The figure which shows the sub-frame allocated to downlink communication and uplink communication in the LTE system of a TDD system Configuration diagram of a mobile station according to an embodiment of the present invention Configuration diagram of a base station according to an embodiment of the present invention The sequence diagram of the component carrier setting method by the Example of this invention Flowchart of component carrier setting method in mobile station according to an embodiment of the present invention Example of signal format for notifying that component carrier is used only for downlink communication (part 1) Example of signal format for notifying that component carrier is used only for downlink communication (part 2) Example of signal format for reporting mobile functional capabilities (part 1) Example of signal format for reporting mobile function (part 2)

  In the embodiment of the present invention, the component carrier of the secondary cell used for carrier aggregation (CA) is set to downlink communication between the base station (eNB: evolved Node B) and the mobile station (UE: User Equipment). An example will be described. In CA, a highly reliable primary cell (PCell) that ensures connectivity with a mobile station and a secondary cell (SCell) that is additionally set in a mobile station connected to the primary cell are set. Further, in the TDD scheme, uplink communication and downlink communication are separated by time in the same frequency band, and it is possible to set a time ratio allocated to uplink communication / downlink communication in a component carrier. In the FDD scheme, uplink communication and downlink communication are separated by frequency.

  In the Example of this invention, all the sub-frames of the component carrier of a secondary cell are set to downlink communication. The component carrier set for downlink communication may be a TDD component carrier or an FDD component carrier. In order to realize such setting, the base station adds a component carrier of the secondary cell, generates a message indicating that the component carrier of the secondary cell is set to downlink communication, and transmits the message to the mobile station. When the component carrier of the secondary cell is added, the mobile station receives the message transmitted from the base station and sets the component carrier of the secondary cell.

  The mobile station may notify the mobile capability indicating whether the mobile station is compatible with either downlink communication or uplink communication when the primary cell is set.

  In the following embodiment, a case where the component carrier is set to downlink communication will be described. However, the embodiment of the present invention can be similarly applied to a case where the component carrier is set to uplink communication.

<Configuration of mobile station>
FIG. 2 shows a configuration diagram of the mobile station 10 according to the embodiment of the present invention. The mobile station 10 includes a downlink (DL) signal receiving unit 101, an uplink (UL) signal transmitting unit 103, a mobile capability notification unit 105, a quality measuring unit 107, a component carrier (CC) setting unit 109, And a communication control unit 111.

  The DL signal receiving unit 101 receives a downlink signal from the base station. Regarding the component carrier setting, the DL signal receiving unit 101 receives a message (RRC Connection Reconfiguration) related to the setting of the quality measurement in the cell from the base station. Also, the DL signal receiving unit 101 receives a message (RRC Connection Reconfiguration) for setting a component carrier to downlink communication from the base station.

  The UL signal transmission unit 103 transmits an uplink signal to the base station. Regarding the setting of the component carrier, the UL signal transmission unit 103 transmits a signal (RRC UE Capability Information) for notifying the mobile capability indicating whether or not the mobile station 10 supports downlink communication. Moreover, UL signal transmission part 103 transmits the quality measurement result (Measurement Report) in a cell.

  The mobile functional capability notification unit 105 notifies the mobile functional capability indicating whether or not the mobile station 10 supports downlink communication via the UL signal transmission unit 103. The mobile functional capability may be notified as the mobile functional capability for each component carrier, that is, for each frequency band that the mobile station can use for carrier aggregation, and all the mobile stations that can be used for carrier aggregation regardless of the component carrier. You may notify as a mobile functional power with respect to a frequency band.

  The quality measurement unit 107 measures the reception quality of a predetermined signal according to a message (RRC Connection Reconfiguration) related to the quality measurement setting received from the base station. The measurement result (Measurement Report) of the cell that satisfies the required quality is reported to the base station via the UL signal transmission unit 103.

  CC setting section 109 sets a component carrier with the base station in accordance with a message from the base station. When the mobile station 10 first connects to the base station, the CC setting unit 109 sets the component carrier of the primary cell according to the message (RRC Connection Reconfiguration) regarding the setting of the component carrier, and the mobile station can be used for carrier aggregation. Configure the component carrier quality measurement settings. Then, when adding a secondary cell, CC setting part 109 sets a component carrier according to the message (RRC Connection Reconfiguration) regarding the setting of the component carrier of a secondary cell. At this time, when receiving setting information indicating that the component carrier is set to downlink communication from the base station, the CC setting unit 109 sets that the component carrier of the secondary cell is used for downlink communication. . Note that CC setting section 109 is not set with a predetermined information item (for example, an information item indicating a time ratio allocated to uplink communication / downlink communication) in a message (RRC Connection Reconfiguration) received from the base station. In this case, the component carrier of the secondary cell may be set to be used for downlink communication.

  The communication control unit 111 controls communication of the mobile station 10 according to the setting in the CC setting unit 109. In particular, when the TDD component carrier of the secondary cell is set to be used for downlink communication, the communication control unit 111 assigns all subframes in the secondary cell to downlink communication. When the FDD component carrier of the secondary cell is set to be used for downlink communication, the communication control unit 111 assigns all frequencies in the secondary cell to downlink communication. Note that uplink control information such as acknowledgment (ACK / NACK) for data received in the secondary cell is transmitted in the primary cell.

<Base station configuration>
FIG. 3 shows a configuration diagram of the base station 20 according to the embodiment of the present invention. The base station 20 includes an uplink (UL) signal receiving unit 201, a downlink (DL) signal transmitting unit 203, a mobile capability management unit 205, a component carrier (CC) setting unit 207, a communication control unit 209, Have

  The UL signal receiving unit 201 receives an uplink signal from a mobile station. Regarding the setting of the component carrier, the UL signal reception unit 201 receives a signal (RRC UE Capability Information) for notifying mobile capability indicating whether or not the mobile station supports downlink communication. The UL signal receiving unit 201 receives a quality measurement result (Measurement Report) in the cell.

  The DL signal transmission unit 203 transmits a downlink signal to the mobile station. Regarding the component carrier setting, the DL signal transmission unit 203 transmits a message (RRC Connection Reconfiguration) regarding the setting of quality measurement in the cell to the mobile station. Moreover, the DL signal transmission part 203 transmits the message (RRC Connection Reconfiguration) for setting a component carrier to downlink communication.

  The mobile functional capability management unit 205 manages the mobile functional capability indicating whether or not the mobile station supports downlink communication. The mobile functional capability may be managed as a mobile functional capability for each component carrier, that is, for each frequency band that the mobile station can use for carrier aggregation, and all the mobile stations that can be used for carrier aggregation regardless of the component carrier. It may be managed as a mobile function for the frequency band.

  CC setting section 207 sets a component carrier with the mobile station. When the mobile station 10 first connects to the base station, the CC setting unit 207 sets the component carrier of the primary cell in response to a connection request (RRC Connection Request) from the mobile station. For example, the CC setting unit 207 performs settings related to component carrier quality measurement. Moreover, the CC setting part 207 sets the component carrier of a secondary cell based on the quality measurement result reported from the mobile station. When the mobile station supports downlink communication with reference to the mobile capability management unit 205, the CC setting unit 207 sets the component carrier of the secondary cell to downlink communication, and a message regarding the setting of the secondary cell (RRC Connection Reconfiguration) may be generated.

  The communication control unit 209 controls communication of the base station 20 according to the setting in the CC setting unit 207. In particular, when the TDD component carrier of the secondary cell is set to be used for downlink communication, the communication control unit 209 allocates all subframes in the secondary cell to downlink communication. When the FDD component carrier of the secondary cell is set to be used for downlink communication, the communication control unit 209 allocates all frequencies in the secondary cell to downlink communication. Note that uplink control information such as acknowledgment (ACK / NACK) for data transmitted in the secondary cell is received in the primary cell.

<Communication method in mobile station and base station>
FIG. 4 shows a sequence diagram of a component carrier setting method according to an embodiment of the present invention.

  First, the mobile station transmits an RRC Connection Request that is a connection request in order to connect to the base station (step S101). In response to this connection request, the base station transmits RRC Connection Setup including cell setting information for establishing a connection (step S103).

  Thereafter, the mobile station transmits RRC Connection Setup Complete for network registration processing (Attach) (step S105). In response to the registration process from the mobile station, the base station transmits an Initial UE Message to the MME (Mobility Management Entity) (step S107). Thereafter, processing such as authentication and security is performed (step S109), and an Initial Context Setup Request is transmitted from the MME to the base station (step S111).

  The base station transmits RRC UE Capability Inquiry to inquire the mobile station about the mobile capability (step S113), and the mobile station transmits RRC UE Capability Information to notify the mobile capability (step S115). This RRC UE Capability Information notifies whether or not the mobile station supports only downlink communication.

  In response to receiving the RRC UE Capability Information, the base station transmits UE Capability Info Indication to the MME (Step S117) and transmits Security Mode Command to the mobile station (Step S119). Then, the base station indicates that the mobile station registration process has been accepted, and transmits RRC Connection Reconfiguration to the mobile station in order to set the component carrier of the frequency band to which the mobile station corresponds (step S121). . By this RRC Connection Reconfiguration, the setting of quality measurement in the cell is notified. Thereafter, the mobile station transmits Security Mode Complete (step S123), and transmits RRC Connection Reconfiguration Complete indicating that the setting of the component carrier of the primary cell is completed (step S125). Then, Initial Context Setup Response from the base station and Attach Complete from the mobile station are transmitted to the MME (steps S127 and S129), and the mobile station is registered in the network.

  The mobile station measures the reception quality of a predetermined signal according to RRC Connection Reconfiguration and reports the measurement result (Measurement Report) of the cell that satisfies the required quality to the base station (step S131).

  The base station transmits RRC Connection Reconfiguration to the mobile station in order to set the reported cell as a secondary cell (step S133). When the mobile station supports only downlink communication, the component carrier of the secondary cell may be set to downlink communication by this RRC Connection Reconfiguration. A specific component carrier setting method in the mobile station will be described below with reference to FIG. And a mobile station transmits RRC Connection Reconfiguration Complete which shows that the setting of the component carrier of a secondary cell was completed (step S135).

  FIG. 5 shows a flowchart of a component carrier setting method in a mobile station according to an embodiment of the present invention.

  As described with reference to FIG. 4, the mobile station transmits RRC UE Capability Information to notify the mobile capability, and the base station transmits RRC Connection Reconfiguration to set the component carrier of the secondary cell. To do.

  When the mobile station receives this RRC Connection Reconfiguration from the base station (step S201), the mobile station determines whether the component carrier of the secondary cell is a TDD component carrier or an FDD component carrier (step S201). S203). For example, the mobile station determines whether the downlink center frequency of the secondary cell is a TDD component carrier.

  If it is a TDD component carrier (step S203: Yes), it is determined whether or not the component carrier of the secondary cell is set to be used for downlink communication by RRC Connection Reconfiguration (step S205). This is determined by a predetermined information item in RRC Connection Reconfiguration. If it is set to be used for downlink communication (step 205: Yes), all subframes in the secondary cell are assigned to downlink communication (step S207). If it is not set to be used for downlink communication (step 205: No), the communication direction of the subframe of the secondary cell is set according to the time ratio allocated to uplink communication / downlink communication (step S209). ).

  If it is not a TDD component carrier (step S203: No), that is, if it is an FDD component carrier, whether or not the component carrier of the secondary cell is set to be used for downlink communication by RRC Connection Reconfiguration. Is determined (step S211). This is determined by a predetermined information item in RRC Connection Reconfiguration. When it is set to be used for downlink communication (step 211: Yes), all frequencies in the secondary cell are assigned to downlink communication (step S213). When it is not set to be used for downlink communication (step 211: No), downlink communication is performed at the downlink center frequency, and the uplink center frequency set by a predetermined information item in RRC Connection Reconfiguration. FDD communication for performing uplink communication is set in the secondary cell (step S215).

<Example of signal format>
6 and 7 show examples of signal formats for notifying that a component carrier is used only for downlink communication.

  FIG. 6 shows an example for explicitly notifying by adding a new bit in the RRC Connection Reconfiguration message in order to set the component carrier of the secondary cell to downlink communication. For example, supplementalDl-r12 may be added in the RadioResourceConfigCommon Information Element included in the RRC Connection Reconfiguration message to notify that the component carrier is used only for downlink communication. For example, when supplementalDl-r12 is TRUE, the mobile station sets the notified component carrier of the secondary cell to downlink communication. However, if the time ratio (TDD-Config) assigned to the TDD uplink / downlink communication has been set before, the setting needs to be released.

  FIG. 7 shows an example for implicit notification using an existing information item in RRC Connection Reconfiguration in order to set the component carrier to downlink communication. For example, the TDDSCell in the RadioResourceConfigCommon Information Element included in the RRC Connection Reconfiguration message is set with a time ratio allocated to TDD uplink / downlink communication. For example, when TDDSCell is not set, the mobile station sets the notified component carrier of the secondary cell to downlink communication.

  FIG. 8 and FIG. 9 show examples of signal formats for notifying the mobile functional capability.

  FIG. 8 shows an example for the mobile station to notify the mobile functional capability for each frequency band that can be used for carrier aggregation. The supplemental DL-r12 is added to the UE-EUTRA-Capability Information Element included in the RRC UE Capability Information message, and only downlink communication can be set for each frequency band that the mobile station can use for carrier aggregation. It may be notified whether or not. For example, when a mobile station can use three frequency bands (for example, 800 MHz band, 1.5 GHz band, and 2 GHz band) by carrier aggregation, whether only downlink communication can be set for each frequency band. May be notified.

  FIG. 9 shows an example for the mobile station to notify the mobile functional capability to all frequency bands that can be used for carrier aggregation. The supplemental DL-r12 is added to the UE-EUTRA-Capability Information Element included in the RRC UE Capability Information message, and only the downlink communication is set for all frequency bands that the mobile station can use for carrier aggregation. You may notify whether it is possible. For example, when a mobile station can use three frequency bands (for example, 800 MHz band, 1.5 GHz band, and 2 GHz band) by carrier aggregation, it is possible to set only downlink communication for all three frequency bands. It may be notified whether or not.

  In addition, although the case where the component carrier of the secondary cell is set to downlink communication has been described in the above embodiment, the case of setting the component carrier of the secondary cell to uplink communication also relates to the downlink in the above embodiment. It can be applied by replacing the description with uplink.

<Effect of the embodiment of the present invention>
According to the embodiment of the present invention, when a component carrier of a secondary cell is added, it is possible to realize communication in which the component carrier of the secondary cell is set to either downlink communication or uplink communication. .

  For example, when the amount of downlink data is large, further high throughput can be realized by setting the component carrier of the secondary cell set by carrier aggregation to only downlink communication.

  In addition, the communication set to one of the downlink communication and the uplink communication newly defines a time ratio in which all subframes are allocated to the downlink communication in the subframe configuration of FIG. It is not necessary and can be realized using a signal when a component carrier of a secondary cell is added.

  For convenience of explanation, the base station and the mobile station according to the embodiment of the present invention are described using functional block diagrams, but the base station and the mobile station according to the embodiment of the present invention may be hardware, software, or A combination thereof may be realized. In addition, the functional units may be used in combination as necessary. In addition, the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment.

  As described above, when the component carrier of the secondary cell is added, the method for realizing the communication in which the component carrier of the secondary cell is set to either one of downlink communication or uplink communication has been described. Without being limited to the above-described embodiments, various modifications and applications are possible within the scope of the claims.

DESCRIPTION OF SYMBOLS 10 Mobile station 101 Downlink (DL) signal receiving part 103 Uplink (UL) signal transmission part 105 Mobile functional power notification part 107 Quality measurement part 109 Component carrier (CC) setting part 111 Communication control part 20 Base station 201 Uplink ( UL) signal reception unit 203 downlink (DL) signal transmission unit 205 mobile capability management unit 207 component carrier (CC) setting unit 209 communication control unit

Claims (9)

A mobile station that communicates by applying carrier aggregation,
A receiver that receives a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
In accordance with the received message, a component carrier setting unit that sets the component carrier of the secondary cell;
I have a,
When the predetermined information item in the message received by the receiving unit is not set, the component carrier setting unit sets the component carrier of the secondary cell to either downlink communication or uplink communication . Further comprising a UE capability notifying unit for notifying the UE capability indicating whether the mobile station corresponds to one communication either downlink communication or uplink communication, the mobile station according to claim 1. A mobile station that communicates by applying carrier aggregation,
A mobile capability notification section for notifying the mobile capability indicating whether the mobile station supports downlink communication or uplink communication;
A receiver that receives a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
In accordance with the received message, a component carrier setting unit that sets the component carrier of the secondary cell;
Have
The UE capability notification unit as UE capability of each frequency band which the mobile station is compatible, or a UE capability of the entire frequency band which the mobile station is compatible, moves you notify UE capability Motive. A base station that communicates by applying carrier aggregation,
A component carrier setting unit that adds a component carrier of the secondary cell and generates a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication;
A transmitter for transmitting the generated message to the mobile station;
I have a,
The component carrier setting unit causes the mobile station to set the component carrier of the secondary cell to either one of downlink communication or uplink communication, so that the message is set without setting a predetermined information item in the message. Generating base station. A base station that communicates by applying carrier aggregation,
Moving station and UE capability management unit for managing UE capability indicating whether corresponds to one of the communication of the down link communication or uplink communication,
Component carrier setting for adding a component carrier of the secondary cell and generating a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication based on the managed mobile capability And
A transmitter for transmitting the generated message to the mobile station;
Have
The mobile functional capability management unit is a base station that manages the mobile functional capability as a mobile functional capability for each frequency band supported by the mobile station or as a mobile functional capability for all frequency bands supported by the mobile station . A communication method in a mobile station that communicates by applying carrier aggregation,
Receiving a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
Setting the component carrier of the secondary cell according to the received message;
I have a,
In the setting step, when a predetermined information item in the received message is not set, the communication method of setting the component carrier of the secondary cell to either downlink communication or uplink communication.   A communication method in a mobile station that communicates by applying carrier aggregation,
  A step of notifying mobile capability indicating whether or not the mobile station supports communication of either downlink communication or uplink communication;
  Receiving a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication when the component carrier of the secondary cell is added;
  Setting the component carrier of the secondary cell according to the received message;
  Have
  In the notifying step, a communication method for notifying a mobile functional capability as a mobile functional capability for each frequency band supported by the mobile station or as a mobile functional capability for all frequency bands supported by the mobile station. A communication method in a base station that communicates by applying carrier aggregation,
Adding a component carrier of the secondary cell, and generating a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication;
Sending the generated message to the mobile station;
I have a,
In the generating step, in order to cause the mobile station to set the component carrier of the secondary cell to either downlink communication or uplink communication, the message is transmitted without setting a predetermined information item in the message. Communication method to generate .   A communication method in a base station that communicates by applying carrier aggregation,
  Managing the mobile capability indicating whether the mobile station is compatible with either downlink communication or uplink communication; and
  Adding a component carrier of the secondary cell, and generating a message indicating that the component carrier of the secondary cell is set to either downlink communication or uplink communication based on the managed mobility capability; and
  Transmitting the generated message to the mobile station;
  Have
  In the managing step, a communication method for managing a mobile functional capability as a mobile functional capability for each frequency band supported by the mobile station or as a mobile functional capability for all frequency bands supported by the mobile station.

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