JP5661865B2 - Mobile station - Google Patents

Description

  The present invention relates to a mobile station, a radio base station, and a communication control method.

  Wideband code division multiple access (WCDMA (registered trademark): Wideband Code Multiplexing Access), high-speed downlink packet access (HSDPA), high-speed uplink packet access (HSUPA: High) The communication system that succeeds the Uplink Packet Access (LTE) system, that is, the Long Term Evolution (LTE) system, was studied by the standardization organization 3GPP of WCDMA (registered trademark), and specification work was performed.

  Also, as a communication method succeeding the LTE method, the LTE-advanced method is being studied by 3GPP. Non-Patent Document 1 summarizes the requirements for the LTE-advanced scheme.

  In the LTE-advanced scheme, it is agreed that “carrier aggregation” is performed as the requirement. When “carrier aggregation” is performed, the mobile station UE can receive a downlink signal using a plurality of carriers at the same time, or can transmit an uplink signal using a plurality of carriers at the same time. Each carrier in the case where carrier aggregation is performed is referred to as a component carrier.

  The plurality of component carriers are classified into a primary component carrier that is a main carrier and other secondary component carriers.

  Here, when the mobile station UE always performs communication using the primary component carrier and the secondary component carrier, there is a problem that power consumption increases in proportion to the number of component carriers. Here, communication is performed using the primary component carrier and the secondary component carrier, in addition to normal data transmission / reception, cell search and measurement in each component carrier, and radio link monitoring (Radio Link Monitoring) included.

  The cell search refers to establishing downlink synchronization using, for example, a downlink synchronization signal (Synchronization Signal) of a serving cell and an adjacent cell. Since the cell search is a process of detecting a destination cell in a state where the mobile station UE is moving, the mobile station UE needs to periodically perform a cell search. The measurement refers to, for example, measuring received power of reference signals of a serving cell and an adjacent cell, more specifically, RSRP (Reference Signal Received Power). The cell search and the measurement process may be combined and called a measurement. The radio link monitoring means the radio quality of the reference signal of the serving cell, more specifically, SIR (Signal-to-Interference Ratio) is measured, and whether or not the SIR is equal to or higher than a required threshold value. And the serving cell is determined to be out-of-synchronization when it is equal to or less than a required threshold value. Non-Patent Documents 2 and 3 describe, for example, processing related to cell search, measurement, and radio link monitoring, and performance specifications.

  In order to improve the above-described problem of power consumption, for example, it is considered to apply control called Activation / De-activation in the secondary component carrier. For example, regarding the secondary component carrier in the De-activation state, the mobile station UE does not perform normal data transmission / reception, and the frequency of the cell search, measurement, and radio link monitoring processes described above is also increased. Save battery by reducing. The above-described processing related to De-activation of the secondary component carrier is performed, for example, when the amount of data to be communicated is small.

  By the way, in LTE, discontinuous reception (DRX) control for the purpose of battery saving of UE of a mobile station is applied (Non-Patent Document 4). The intermittent reception control in LTE is applied when the radio base station eNB and the mobile station UE are connected and there is no data to be communicated. The mobile station UE in the intermittent reception state is periodically That is, it is configured to intermittently receive a downlink control signal transmitted via a physical downlink control channel (PDCCH). The time for receiving the downlink control signal transmitted via the PDCCH is called On-duration (ON section, receiving section). The above-described cell search, measurement, and wireless link monitoring are also generally performed by the on-duration. In such a case, the mobile station UE may receive the downlink control signal transmitted via the physical downlink control channel PDCCH intermittently, not at all timings, and intermittently perform the cell search, measurement, radio Since it is only necessary to monitor the link, the power consumption of the battery can be reduced.

  More specifically, as shown in FIG. 1, the mobile station UE performs physical downlink only in a reception interval (5 ms in the example of FIG. 1) set every DRX cycle (1280 ms in the example of FIG. 1). It is configured to perform reception of the link control channel PDCCH, cell search, measurement, monitoring of a radio link, and the like, and to turn off other transceivers. As a result, the mobile station UE can reduce the power consumption of the battery.

  In LTE, a measurement gap for measuring carriers of different frequencies and carriers of different wireless communication systems is defined (Non-Patent Document 5). The magnitude of the measurement gap is 6 ms, and the period is set to 40 ms or 80 ms, for example. The mobile station UE stops communication with the serving cell during the measurement gap, and measures the carrier of the different frequency or the carrier of a different radio communication system.

3GPP TS36.913 (V8.0.1) 3GPP TS36.213 V8.8.0 (2009-09) 3GPP TS36.133 V8.7.0 (2009-09) 3GPP TS36.321 V8.7.0 (2009-09) 3GPP TS36.331 V8.8.0 (2009-12)

  As described above, it is considered that De-activation is applied to the secondary component carrier when carrier aggregation is performed.

  In this case, the mobile station UE communicates only with the primary component carrier in a normal state, and only when the above-described cell search, measurement, and radio link monitoring are performed in the secondary component carrier, the primary component carrier and the secondary component carrier. You will communicate with both.

  However, as shown in FIGS. 2 and 3, the mobile station UE performs communication with only the primary component carrier and when it communicates with both the primary component carrier and the secondary component carrier. Need to be switched. As a result, there is a problem that data cannot be transmitted / received in the primary component carrier when switching between a state in which communication is performed only with the primary component carrier and a state in which communication is performed with both the primary component carrier and the secondary component carrier. Here, the fact that the data cannot be transmitted / received may mean that, for example, data intended to be transmitted / received is lost.

  That is, when the mobile station UE receives a plurality of component carriers using a single receiver, switching of the center frequency of the receiver occurs when the number of component carriers to be received is changed. As a result, there is a problem that data cannot be transmitted / received at the time of switching.

  In general, when the mobile station UE performs cell search, measurement, and radio link monitoring depends on the implementation of the mobile station UE, the radio base station eNB determines when the above-mentioned data loss occurs. I can't figure it out.

  Therefore, the present invention has been made in view of the above-mentioned problems, and by performing cell search and measurement of each component carrier appropriately while performing battery saving at the time of carrier aggregation, It is an object of the present invention to provide a mobile station, a radio base station, and a communication control method that can realize efficiency and stability of connectivity.

The mobile station of the present invention
A mobile station that communicates with a radio base station using two or more component carriers,
If the two or more component carriers are configured by the component carrier is a discontinuous reception state and the component carrier is not a discontinuous reception state,
A first communication unit that communicates with a component carrier that is not in the intermittent reception state;
A second communication unit that communicates with the component carrier in the intermittent reception state,
The first communication unit is configured to regard a section before and after an ON section of a component carrier in the intermittent reception state as a measurement gap.

  As described above, according to the present invention, during carrier aggregation, while performing battery saving and appropriately performing cell search and measurement of each component carrier, system efficiency and connection It is possible to provide a mobile station, a radio base station, and a communication control method that can realize stability of performance.

It is a figure for demonstrating the intermittent reception control in the conventional mobile communication system. The figure which shows the center frequency of the receiver in the case of receiving both a primary component carrier and a secondary component carrier The figure which shows the center frequency of the receiver in the case of receiving only a primary component carrier The figure for demonstrating the component carrier in the mobile communication system which concerns on embodiment of this invention The figure for demonstrating operation | movement of the mobile station and radio | wireless base station which concerns on embodiment of this invention (when the magnitude | size of a receiver switching area is the same) The figure for demonstrating operation | movement of the mobile station and radio | wireless base station which concerns on embodiment of this invention (when the magnitude | size of a receiver switching area differs) The block diagram of the mobile station which concerns on embodiment of this invention The block diagram of the radio base station which concerns on embodiment of this invention Flowchart of communication control method in mobile station according to an embodiment of the present invention Flowchart of communication control method in mobile station according to an embodiment of the present invention Flowchart of communication control method in radio base station according to an embodiment of the present invention Flowchart of communication control method in radio base station according to an embodiment of the present invention The figure which shows the measurement area for SCC used in the example of a change of this invention

(Configuration of mobile communication system according to the first embodiment of the present invention)
Hereinafter, a mobile communication system according to a first embodiment of the present invention will be described with reference to the drawings. In all the drawings for explaining the present embodiment, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

  The mobile communication system according to the present embodiment is a system to which, for example, the LTE-Advanced scheme is applied. That is, the mobile communication system according to the present embodiment includes a radio base station eNB and a mobile station UE that communicates with the radio base station eNB, and the radio base station eNB and the mobile station UE use the LTE-Advanced scheme. , Communicate. Note that the mobile station UE may be referred to as a user apparatus.

  Hereinafter, communication channels used in the mobile communication system according to the present embodiment will be described.

  In the mobile communication system according to the present embodiment, in the downlink, “physical downlink shared channel (PDSCH)” and “physical downlink control channel (PDCCH) shared by each mobile station UE are provided. Channel) ”is used.

  User data, that is, a normal data signal is transmitted through the “physical downlink shared channel (PDSCH)”.

  Further, the ID of the mobile station UE that communicates using the “physical downlink shared channel (PDSCH)” via the “physical downlink control channel (PDCCH)” and the information on the transport format of the user data (that is, the downlink) Scheduling information) and control signals such as the ID of the mobile station UE that communicates using the “physical uplink shared channel (PUSCH)” and information on the transport format of user data (ie, uplink scheduling grant) are notified. .

  The “physical downlink control channel (PDCCH)” may be referred to as a “downlink L1 / L2 control channel (Downlink L1 / L2 Control Channel)”. Further, “downlink scheduling information” and “uplink scheduling grant” may be collectively referred to as “downlink control information (DCI)”.

  In the downlink, broadcast information is transmitted after being mapped to “BCCH: Broadcast Control Channel” as a logical channel.

  Here, a part of the information transmitted through “BCCH” is mapped to “BCH: Broadcast Channel” that is a transport channel, and the information mapped to “BCH” is “P-” that is a physical channel. It is transmitted to the mobile station UE in the corresponding cell via “BCH: Physical Broadcast Channel”.

  Also, a part of the information transmitted via “BCCH” is mapped to “DL-SCH: Downlink Shared Channel” which is a transport channel, and the information mapped to “DL-SCH” is a physical channel. It is transmitted to a mobile station UE in the corresponding cell via a certain “physical downlink shared channel (PDSCH)”.

  In the mobile communication system according to the present embodiment, in the uplink, the “physical uplink shared channel (PUSCH)” and the “physical uplink control channel (PUCCH: Physical Uplink Control Channel) ”is used.

  User data, that is, a normal data signal is transmitted through the “physical uplink shared channel (PUSCH)”.

  In addition, the “physical uplink control channel (PUCCH)” is used for scheduling processing of the “physical uplink shared channel (PUSCH)” and adaptive modulation and coding (AMCS), and downlink for use in the coding scheme (AMCS). Quality information (CQI: Channel Quality Indicator) and delivery confirmation information (Acknowledgement Information) in the “physical uplink shared channel (PUSCH)” are transmitted.

  Such downlink quality information may be referred to as “CSI (Channel State Indicator)”, which is an indicator that summarizes “CQI”, “PMI (Pre-coding Matrix Indicator)” and “RI (Rank Indicator)”. .

  The contents of the acknowledgment information include an acknowledgment (ACK: Acknowledgement) indicating that the transmission signal has been properly received or a negative acknowledgment (NACK: Negative Acknowledgment) indicating that the transmission signal has not been properly received. It is expressed by either.

  The above-described operation related to the communication channel used in the mobile communication system according to the present embodiment may be performed in one component carrier when carrier aggregation described later is performed, or may be performed on a plurality of component carriers. It may be performed across. For example, downlink scheduling information may be transmitted on a certain component carrier, and a physical downlink shared channel corresponding to the downlink scheduling information may be transmitted on another component carrier. Alternatively, the uplink scheduling grant may be transmitted on a certain component carrier, and the physical uplink shared channel corresponding to the uplink scheduling grant may be transmitted on another component carrier.

  When the LTE-Advanced scheme is applied, “Carrier Aggregation” may be applied. That is, communication using a plurality of “component carriers” is performed in the uplink or the downlink.

  Here, the “component carrier” corresponds to one system carrier in the LTE scheme. That is, in the LTE scheme, communication is performed using one “component carrier”. However, in the LTE-Advanced scheme, communication may be performed using two or more “component carriers”.

  For example, as shown in FIG. 4, in the mobile communication system according to the present embodiment, a cell (first communication area) in which a first component carrier (F1 in the figure) is used and a second component carrier (in the figure). Then, the cell (second communication area) in which F2) is used overlaps geographically. In FIG. 2, the first communication area and the second communication area are almost completely overlapped geographically, but instead may be geographically overlapped at least partially.

  Although not shown in FIG. 4, a third component carrier may exist in addition to the first component carrier and the second component carrier. Alternatively, there may be four or more component carriers.

  In the following description, it is assumed that carrier aggregation is performed using a first component carrier (hereinafter referred to as a first carrier) and a second component carrier (hereinafter referred to as a second carrier).

  Further, in the first carrier and the second carrier, intermittent reception control is performed for each component carrier, the first carrier is not in an intermittent reception state (non-DRX state), and the second carrier is in DRX. Assume a state. That is, in the first carrier, data transmission / reception is performed as usual, and cell search, measurement, and radio link monitoring are also performed without reducing the frequency. On the other hand, data transmission / reception is basically not performed on the second carrier, and cell search, measurement, and monitoring of the radio link are performed with a reduced frequency. Note that monitoring of the radio link may not be performed. In this case, since the mobile station UE can reduce the processing load for the second carrier, that is, the processing load for cell search, measurement, and radio link monitoring described above, it is possible to perform battery saving. .

  The first carrier may be a primary component carrier. The second carrier may be a secondary component carrier.

  The above-mentioned Non-DRX state is a state where parameters related to intermittent reception control are not set, or a parameter related to intermittent reception control is set, and a timer for intermittent reception control operates. Or a parameter related to intermittent reception control is set, a scheduling request is pending, or a parameter related to intermittent reception control is set, and uplink HARQ retransmission is performed. After receiving the random access response for the specified preamble and the parameter related to intermittent reception control, the downlink control signal for new transmission addressed to the local station is received. It may be at least one of the states that are not. Further, the DRX state may be a state that is not the Non-DRX state described above.

  Note that the above-described DRX state and Non-DRX state may be a state in which data transmission / reception is intermittently performed more generally, or data transmission / reception and the carrier state are intermittently performed. It may be in a state where measurement is performed. Alternatively, the above-described DRX state and Non-DRX state may be a state in which the carrier is measured intermittently more generally.

  Next, operations of the mobile station and the radio base station according to this embodiment will be described with reference to FIG. More specifically, when there is a component carrier that is not in the intermittent reception state (first carrier) and a component carrier that is in the intermittent reception state (second carrier), the component carrier that is in the intermittent reception state (second carrier) The communication operation in the component carrier (first carrier) that is not in the intermittent reception state and the component carrier (second carrier) that is in the intermittent reception state in consideration of the on-duration (ON interval) of FIG.

  In FIG. 5, for the second carrier, an on-duration (ON section) is set for each DRX cycle. Here, the section that is on-duration is called section A, and the section that is not on-duration is called section B. The DRX cycle may be, for example, 256 ms, 512 ms, or 1280 ms. Alternatively, the DRX cycle may be a value other than the above, for example. The DRX cycle controls how much battery saving can be performed in the mobile station UE.

  Only in the section A, the mobile station UE is configured to perform cell search and measurement regarding the second carrier, monitoring of a radio link, and the like, and to receive a downlink control signal transmitted via the PDCCH. Also, the mobile station UE is configured not to perform cell search and measurement regarding the second carrier, radio link monitoring, and reception of downlink control signals in the section B. With the above-described operation, the mobile station UE performs the above-described process regarding the second carrier only in the section A, and thus can perform battery saving. The downlink control signal is, for example, the above-described downlink scheduling information or uplink scheduling grant.

  On the other hand, since the mobile station UE is a component carrier that is not in the intermittent reception state with respect to the first carrier, regardless of the sections A and B, normal data transmission / reception in the first carrier and cell search for the first carrier And monitoring of radio links.

  Here, in the operation of the radio base station eNB and the mobile station UE according to the present embodiment, in order to avoid data loss due to switching of the center frequency of the receiver shown in FIG. A receiver switching section is set before and after the on-duration in the intermittent reception control.

  In other words, the mobile station UE and the radio base station eNB can switch the center frequency of the receiver of the mobile station UE in a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier. Therefore, communication processing in the first carrier may be performed on the assumption that data transmission / reception is not possible in the first carrier. The predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, the receiver switching section is hereinafter referred to as an on-duration gap section. Note that such communication processing may include, for example, processing such as measurement and cell search related to the first carrier, and monitoring of a radio link, in addition to transmission and reception of data on the first carrier. The transmission / reception of data in the first carrier is reception of data in the downlink and transmission of data in the uplink for the mobile station UE, and transmission of data in the downlink for the radio base station eNB, and The reception of data in the uplink may be possible. The measurement and cell search processes may be collectively referred to as measurement.

  For example, the mobile station UE does not perform downlink reception, uplink transmission, cell search, measurement gap, and radio link monitoring on the first carrier in the receiver switching section. It may be configured. Further, the radio base station eNB may be configured not to perform downlink transmission and uplink reception regarding the mobile station UE in the first carrier in the receiver switching section. Furthermore, the radio base station eNB performs scheduling related to the uplink and the downlink in the first carrier so that the downlink transmission and the uplink reception in the first carrier are not performed in the receiver switching section. It may be configured as follows.

  Here, the mobile station UE and the radio base station eNB may be configured to perform communication processing on the first carrier, regarding the receiver switching section as a section corresponding to a measurement gap. Here, regarding the receiver switching section as a section corresponding to the measurement gap, the communication processing in the first carrier is performed, for example, as described above, in the receiver switching section, It may mean that data transmission / reception in one carrier, cell search, measurement, radio link monitoring, etc. are not performed. The measurement gap may be a time interval provided for measuring carriers of different frequencies or carriers of different wireless communication systems.

  In addition, the mobile station UE and the radio base station eNB are in a predetermined section set before and after the On-duration in the intermittent reception control for the second carrier, that is, in the On-duration Gap section, the mobile station UE Since the receiver performs center frequency switching or the like, the second carrier may perform communication processing on the assumption that data transmission / reception is not possible on the second carrier. Such communication processing may include, for example, processing such as transmission / reception of data in the second carrier. The transmission / reception of data in the second carrier is reception of data in the downlink and transmission of data in the uplink for the mobile station UE, and transmission of data in the downlink for the radio base station eNB, and The reception of data in the uplink may be possible.

  For example, the mobile station UE may be configured not to perform downlink reception and uplink transmission in the second carrier in the receiver switching section. Further, the radio base station eNB may be configured not to perform downlink transmission and uplink reception regarding the mobile station UE in the second carrier in the receiver switching section. Further, the radio base station eNB performs scheduling related to the uplink and downlink in the second carrier so that downlink transmission and uplink reception in the second carrier are not performed in the receiver switching section. It may be configured as follows.

  Here, the mobile station UE and the radio base station eNB may perform the communication process on the second carrier by regarding the receiver switching section as a section corresponding to the measurement gap. Here, regarding the receiver switching section as a section corresponding to the measurement gap, the communication processing in the first carrier is performed, for example, as described above, in the receiver switching section, It may mean that data transmission / reception in one carrier, cell search, measurement, radio link monitoring, etc. are not performed. The measurement gap may be a time interval provided for measuring carriers of different frequencies or carriers of different wireless communication systems.

  In consideration of the fact that the predetermined section set before and after the above-described on-duration, that is, the receiver switching section or the on-duration gap section, the transmitter is switched in addition to the receiver. May be referred to as a transceiver switching section. Alternatively, since it is a section set before and after the on-duration in the intermittent reception control, it may be called a measurement gap accompanying the on-duration. Alternatively, the predetermined section set before and after the above-described on-duration may be called a measurement gap in the same way as a normal measurement gap.

  In addition, the predetermined section set before and after the on-duration, that is, the gap section for on-duration may be 1 ms, for example, or 2 ms. Alternatively, the On-duration gap interval may be a value other than 1 ms and 2 ms.

  Note that the size of a predetermined section set before and after the on-duration, that is, the section set before the on-duration in the gap section for on-duration is as shown in FIG. It may be larger than the size of the section set after the duration. The effect of making the size of the section set before the on-duration larger than the size of the section set after the on-duration will be described later.

  More specifically, the predetermined section set before the on-duration and the predetermined section set after the on-duration may be 6 ms and 1 ms, respectively, for example. Alternatively, the predetermined section set before the On-duration and the predetermined section set after the On-duration may be 4 ms and 2 ms, respectively, or the On As long as the size of the predetermined section set before -duration is larger than the size of the predetermined section set after the on-duration, other values may be used.

  The predetermined section set before and after the above-described on-duration, that is, the on-duration gap section is applied only when the first carrier and the second carrier belong to the same frequency band. And the second carrier may not be applied when they belong to different frequency bands.

  In general, when the first carrier and the second carrier belong to different frequency bands, since the mobile station UE has separate receivers for the first carrier and the second carrier, the center frequency as shown in FIG. 2 and FIG. As a result, no data is lost. Therefore, when the first carrier and the second carrier belong to different frequency bands, the predetermined section set before and after the above-described on-duration is unnecessary. In other words, only when the first carrier and the second carrier belong to the same frequency band, the On-duration gap section is set, and when the first carrier and the second carrier belong to different frequency bands, By not setting the on-duration gap section, the on-duration gap section can be set only when necessary, and the efficiency of the system can be further improved.

  The on-duration in the second carrier exists only when the second carrier is in the DRX state, and does not exist when the second carrier is in the non-DRX state. Therefore, when the second carrier is in the Non-DRX state, the receiver of the mobile station UE is always in the state illustrated in FIG. 2, and the mobile station UE and the radio base station eNB are in the On-duration described above. Communication of the first carrier and the second carrier can be performed without considering the use gap interval. As a result, the mobile station UE and the radio base station eNB, when both the first carrier and the second carrier are in the Non-DRX state, the first carrier and the second carrier without a gap section for measurement. Communication is possible, and loss of throughput can be avoided.

  As illustrated in FIG. 7, the mobile station UE includes a first communication unit 102, a second communication unit 104, a DRX control unit 106, and a gap control unit 108. In addition, the first communication unit 102 includes a first downlink reception unit 102A, a first uplink transmission unit 102B, and a first measurement unit 102C, and the second communication unit 104 includes a second downlink reception unit 104A. A second uplink transmission unit 104B and a second measurement unit 104C are provided.

  In FIG. 7, functional units related to baseband processing in the mobile station UE are illustrated, and functional units related to RF (radio part) processing in the mobile station UE are not illustrated. That is, the receivers shown in FIGS. 2 and 3 are not illustrated because they are included in the functional unit related to RF processing. The configuration of the mobile station UE shown in the present embodiment may be applied regardless of the functional unit related to the RF processing.

  First communication unit 102, first downlink reception unit 102A, first uplink transmission unit 102B, first measurement unit 102C, second communication unit 104, second downlink reception unit 104A, second The uplink transmission unit 104B, the second measurement unit 104C, the DRX control unit 106, and the gap control unit 108 are connected to each other.

  The first communication unit 102 performs communication related to the first carrier. For example, the first communication unit 102 performs downlink reception and uplink transmission on the first carrier, cell search and measurement related to the first carrier, radio link monitoring, and the like.

  As described above, the first communication unit 102 relates to the first carrier in a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap section. You may be comprised so that communication may not be performed.

  The first downlink reception unit 102A receives a downlink signal in the first carrier. Here, the downlink signal may be, for example, PDSCH or PDCCH. Alternatively, the downlink signal may be P-BCH as broadcast information, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) as a synchronization signal, or a downlink reference signal.

  As described above, the first downlink receiving unit 102A has the first interval in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap interval. You may be comprised so that the signal of the downlink in a carrier may not be received.

  The first uplink transmission section 102B transmits an uplink signal on the first carrier. Here, the uplink signal may be, for example, PUSCH or PUCCH. Alternatively, the uplink signal may be a sounding reference signal, a demodulation reference signal, or a random access channel.

  As described above, the first uplink transmitter 102B performs the first interval in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap interval. It may be configured not to transmit uplink signals in the carrier.

  The first measurement unit 102C performs measurement processing such as cell search and measurement in the first carrier, and monitoring of a radio link.

  As described above, the first measurement unit 102C performs the cell search described above in a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap section. Alternatively, measurement processing such as measurement and radio link monitoring may not be performed.

  The second communication unit 104 performs communication related to the second carrier. For example, the second communication unit 104 performs downlink reception and uplink transmission on the second carrier, cell search and measurement on the second carrier, radio link monitoring, and the like.

  As described above, the second communication unit 104 relates to the second carrier in a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap section. You may be comprised so that communication may not be performed.

  The second downlink reception unit 104A receives a downlink signal on the second carrier. Here, the downlink signal may be, for example, PDSCH or PDCCH. Alternatively, the downlink signal may be P-BCH as broadcast information, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) as a synchronization signal, or a downlink reference signal.

  As described above, the second downlink receiving unit 104A performs the second interval in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap interval. You may be comprised so that the signal of the downlink in a carrier may not be received.

  The second uplink transmitter 104B transmits an uplink signal on the second carrier. Here, the uplink signal may be, for example, PUSCH or PUCCH. Alternatively, the uplink signal may be a sounding reference signal, a demodulation reference signal, or a random access channel.

  As described above, the second uplink transmission section 104B performs the second interval in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap interval. It may be configured not to transmit uplink signals in the carrier.

  The second measurement unit 104C performs measurement processing such as cell search and measurement in the second carrier, and monitoring of the radio link.

  Here, the second measurement unit 104 </ b> C has a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap section of the on-duration gap section. In a previously set section, measurement processing such as cell search and measurement in the second carrier, and monitoring of a radio link may be performed. The measurement may include measurement of Pathloss described later.

  In the following, the second measurement unit 104C has a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap section of the on-duration gap section. The meaning of performing measurement processing such as cell search and measurement in the second carrier and monitoring of the radio link in the previously set interval will be described.

  For example, it is assumed that when the second carrier is in an intermittent reception state, data to be transmitted is generated, and uplink transmission occurs in this on-duration. In this case, it is desirable that transmission power for uplink transmission is determined based on the latest path loss as much as possible. In this case, when the path loss is measured in the on-duration, in consideration of processing delay, the result of the measured path loss is reflected in the determination of the transmission power for the uplink transmission. It is difficult. In other words, by measuring the Path loss in the section set before On-duration, the transmission power for such uplink transmission is determined based on the latest Path loss, and as a result, It is possible to improve the quality.

  In the above example, since Path loss is estimated from the received power RSRP of the downlink reference signal, measuring Path loss in the section set before On-duration is the measurement of RSRP (so-called measurement). ) In a section set before On-duration.

  Note that not only RSRP measurement (so-called measurement) but also cell search and radio link monitoring can be performed based on the measurement result in subsequent on-duration, so before on-duration. It is preferable to be performed in the section set to.

  In the section set after On-Duration, only the processing such as switching of the center frequency of the receiver described above occurs, whereas in the section set before On-Duration, the above-mentioned process is performed. In addition to the processing such as switching the center frequency of the receiver, the above-described cell search, measurement, and monitoring of the radio link in the second carrier are performed, so that the section set before the on-duration The size may be set larger than the size of the section set after the on-duration.

  That is, the mobile station UE and the radio base station eNB have the first On-duration Gap section set before the On-duration in the intermittent reception control for the second carrier and the intermittent reception control for the second carrier. In the second On-duration Gap section set after the On-duration, the first carrier may perform communication processing on the assumption that data cannot be transmitted / received on the first carrier. In addition, the size of the first On-duration gap gap may be set larger than the size of the second On-duration gap gap.

  The first on-duration gap interval and the second on-duration gap interval may be regarded as an interval equivalent to the measurement gap, and communication control for the first carrier may be performed. That is, the first on-duration gap interval and the second on-duration gap interval may be regarded as an interval equivalent to the measurement gap, and communication regarding the first carrier may be stopped.

  The DRX control unit 106 is configured to manage whether or not the mobile station UE is in an intermittent reception state. More specifically, the DRX control unit 106 is configured to manage whether or not each of the first carrier and the second carrier is in an intermittent reception state. Then, the DRX control unit 106 includes a first communication unit 102 (a first downlink reception unit 102A, a first uplink transmission unit 102B, a first measurement unit 102C) and a second communication unit 104 (a second downlink reception unit 104A). , The second uplink transmission unit 104B, the second measurement unit 104C) and the gap control unit 108, whether each of the first carrier and the second carrier is in the intermittent reception state, that is, in the intermittent reception state. It is notified whether there is a non-discontinuous reception state and when the on-duration is present.

  The gap control unit 108 performs control related to the measurement gap. More specifically, the measurement gap management for the measurement related to the carrier of the different frequency and the measurement related to the carrier of the different mobile communication system is performed, and the information indicating in which subframe the measurement gap is set is indicated in the DRX control unit. 106 and the first communication unit 102 (first downlink reception unit 102A, first uplink transmission unit 102B, first measurement unit 102C) and second communication unit 104 (second downlink reception unit 104A, second uplink transmission) Unit 104B and second measurement unit 104C).

  Further, the gap control unit 108 manages and controls the above-described receiver switching section, that is, the on-duration gap section, in addition to the measurement gap. That is, the gap control unit 108 sets a section set before and after the on-duration in the intermittent reception control for the second carrier, that is, sets an on-duration gap section, and sets the on-duration gap section as a DRX. Control unit 106 and first communication unit 102 (first downlink reception unit 102A, first uplink transmission unit 102B, first measurement unit 102C) and second communication unit 104 (second downlink reception unit 104A, second uplink) The link transmission unit 104B and the second measurement unit 104C).

  As illustrated in FIG. 8, the radio base station eNB includes a first communication unit 202, a second communication unit 204, a DRX control unit 206, and a gap control unit 208. The first communication unit 202 includes a first downlink transmission unit 202A and a first uplink reception unit 202B, and the second communication unit 204 includes a second downlink transmission unit 204A and a second uplink reception unit. 204B. Gap between first communication unit 202, first downlink transmission unit 202A, first uplink reception unit 202B, second communication unit 204, second downlink transmission unit 204A, second uplink reception unit 204B, DRX control unit 206 The control unit 208 is connected to each other.

  The first communication unit 202 performs communication related to the first carrier. For example, the first communication unit 202 performs downlink transmission, uplink reception, and the like on the first carrier.

  As described above, the first communication unit 202 performs communication related to the first carrier in a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap. It may be configured not to perform.

  202 A of 1st downlink transmission parts transmit the signal of the downlink in a 1st carrier. Here, the downlink signal may be, for example, PDSCH or PDCCH. Alternatively, the downlink signal may be P-BCH as broadcast information, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) as a synchronization signal, or a downlink reference signal.

  As described above, the first downlink transmission unit 202A has the first carrier in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap. It may be configured not to transmit a downlink signal.

  Alternatively, the first downlink transmission unit 202A may perform scheduling so that the mobile station UE does not receive a downlink signal in the on-duration gap. Note that scheduling refers to a process of selecting which mobile station UE performs communication using a shared channel in a certain subframe.

  The first uplink receiver 202B receives an uplink signal on the first carrier. Here, the uplink signal may be, for example, PUSCH or PUCCH. Alternatively, the uplink signal may be a sounding reference signal, a demodulation reference signal, or a random access channel.

  As described above, the first uplink receiving section 202B is configured to use the first carrier in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap. It may be configured not to receive uplink signals in.

  Alternatively, the first uplink reception unit 202B may perform scheduling so that the mobile station UE does not transmit an uplink signal in the on-duration gap. Note that scheduling refers to a process of selecting which mobile station UE performs communication using a shared channel in a certain subframe. Note that more specifically, the first uplink receiving unit 202B is configured to transmit the mobile station UE in the downlink of the corresponding subframe so that the mobile station UE does not transmit an uplink signal in the on-duration gap. It may be configured not to transmit an uplink scheduling grant to the UE. The uplink scheduling grant may be transmitted via the first downlink transmission unit 202A.

  The second communication unit 204 performs communication related to the second carrier. For example, the second communication unit 204 performs downlink transmission, uplink reception, and the like on the second carrier.

  As described above, the second communication unit 204 relates to the second carrier in a predetermined section set before and after the on-duration in the intermittent reception control for the second carrier, that is, in the on-duration gap section. You may be comprised so that communication may not be performed.

  The second downlink transmission unit 204A transmits a downlink signal on the second carrier. Here, the downlink signal may be, for example, PDSCH or PDCCH. Alternatively, the downlink signal may be P-BCH as broadcast information, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) as a synchronization signal, or a downlink reference signal.

  As described above, the second downlink transmission unit 204A performs the second interval in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap interval. You may be comprised so that the signal of the downlink in a carrier may not be transmitted.

  Alternatively, the second downlink transmission unit 204A may perform scheduling so that the mobile station UE does not receive a downlink signal in the on-duration gap. Note that scheduling refers to a process of selecting which mobile station UE performs communication using a shared channel in a certain subframe.

  The second uplink receiving unit 204B receives an uplink signal on the second carrier. Here, the uplink signal may be, for example, PUSCH or PUCCH. Alternatively, the uplink signal may be a sounding reference signal, a demodulation reference signal, or a random access channel.

  As described above, the second uplink reception unit 204B performs the second interval in the predetermined interval set before and after the on-duration in the intermittent reception control for the second carrier, that is, the on-duration gap interval. You may be comprised so that the signal of the uplink in a carrier may not be received.

  Alternatively, the second uplink reception unit 204B may perform scheduling so that the mobile station UE does not transmit an uplink signal in the on-duration gap. Note that scheduling refers to a process of selecting which mobile station UE performs communication using a shared channel in a certain subframe. More specifically, the second uplink receiving section 204B is configured so that the mobile station UE does not transmit an uplink signal in the On-duration Gap, in the corresponding subframe downlink. It may be configured not to transmit an uplink scheduling grant to the UE. The uplink scheduling grant may be transmitted via the second downlink transmission unit 204A.

  The DRX control unit 206 is configured to manage and control whether or not each mobile station UE in the cell is in an intermittent reception state. More specifically, the DRX control unit 206 is configured to manage and control whether or not each mobile station in the cell is in an intermittent reception state for each of the first carrier and the second carrier. Then, the DRX control unit 206 includes a first communication unit 202 (first downlink transmission unit 202A, first uplink reception unit 202B) and a second communication unit 204 (second downlink transmission unit 204A, second uplink reception). Unit 204B) and gap control unit 208, whether each mobile station in the cell and each of the first carrier and the second carrier are in an intermittent reception state, that is, in an intermittent reception state. Or, it is in a non-discontinuous reception state, and when the on-duration is notified.

  The gap control unit 208 performs control related to the measurement gap. More specifically, the measurement gap is managed for measurements on carriers of different frequencies and measurements on carriers of different mobile communication systems, and the measurement gap is set in which subframe for each mobile station in the cell. Information of the DRX control unit 206 and the first communication unit 202 (first downlink transmission unit 202A, first uplink reception unit 202B) and second communication unit 204 (second downlink transmission unit 204A, second uplink). Notify the link receiver 204B).

  Further, the gap control unit 208 performs management and control of the above-described receiver switching section, that is, the on-duration gap section, in addition to the measurement gap. That is, the gap control unit 108 sets a section set before and after the on-duration in the intermittent reception control for the second carrier, that is, sets an on-duration gap section, and sets the on-duration gap section as a DRX. Control unit 206 and first communication unit 202 (first downlink transmission unit 202A, first uplink reception unit 202B) and second communication unit 204 (second downlink transmission unit 204A and second uplink reception unit 204B) Notice.

  The communication control method in the mobile station UE according to this embodiment will be described using FIG.

  In step S302, the mobile station UE determines whether or not the sub-frame is a gap interval before or after the on-duration of the secondary component carrier (secondary CC), that is, an on-duration gap interval. Here, the Secondary CC corresponds to the second carrier in the above description.

  When the sub-frame is a gap interval before and after the on-duration of the secondary CC (step S302: YES), the mobile station UE transmits uplink in the primary component carrier (primary CC) in the sub-frame. And downlink reception is not performed (step S304). Here, the Primary CC corresponds to the first carrier in the above description.

  When the sub-frame is not a gap section before and after the on-duration of the secondary CC (step S302: NO), the mobile station UE performs uplink transmission or downlink in the primary CC as usual in the sub-frame. Is received (step S306).

  The communication control method in the mobile station UE according to the present embodiment will be described using FIG.

  In step S402, the mobile station UE determines whether or not the sub-frame is a gap interval before the on-duration of the secondary CC.

  When the sub-frame is a gap interval before the on-duration of the secondary CC (step S402: YES), the mobile station UE calculates a path loss in the secondary CC in the sub-frame (step S404). ).

  In addition, when the sub-frame is not a gap section before the on-duration of the secondary CC (step S402: NO), the mobile station UE calculates Path loss based on a normal control operation (note that Since this operation is a normal control operation, it is not described in the flowchart). In the operation shown in FIG. 10, the path loss is calculated in step S404. Alternatively, cell search, measurement, RSRP measurement, radio link monitoring, and the like may be performed.

  The communication control method in the radio base station eNB according to the present embodiment will be described using FIG.

  In step S502, the radio base station eNB determines whether or not the sub-frame is a gap interval before and after the on-duration of the Secondary Component Carrier (Secondary CC) for the mobile station UE, that is, an On-duration gap interval. Determine whether. Here, the Secondary CC corresponds to the second carrier in the above description.

  When the sub-frame is a gap interval before and after the secondary CC on-duration related to the mobile station UE (step S502: YES), the radio base station eNB transmits the sub-frame to the mobile station UE in the sub-frame. Thus, no uplink reception or downlink transmission is performed in the Primary Component Carrier (Primary CC) (step S504). Here, the Primary CC corresponds to the first carrier in the above description.

  When the sub-frame is not a gap interval before and after the on-duration of the secondary CC (step S502: NO), the radio base station eNB, in the sub-frame, performs a primary operation on the mobile station UE as usual. In the CC, uplink reception and downlink transmission are performed (step S506).

  The communication control method in the radio base station eNB according to the present embodiment will be described using FIG.

  In step S602, the radio base station eNB determines whether or not the sub-frame is a gap interval before and after the on-duration of the Secondary Component Carrier (Secondary CC) for the mobile station UE, that is, an On-duration gap interval. Determine whether. Here, the Secondary CC corresponds to the second carrier in the above description.

  When the sub-frame is a gap interval before and after the on-duration of the secondary CC (step S602: YES), the radio base station eNB generates downlink transmission or uplink reception in the primary CC related to the UE. Do not schedule. (Step S604). Here, the Primary CC corresponds to the first carrier in the above description.

  When the sub-frame is not a gap section before and after the on-duration of the secondary CC (step S602: NO), the radio base station eNB, in the sub-frame, with respect to the mobile station UE as usual, the uplink, Then, downlink scheduling is performed (step S606).

  In the above-described example, the carrier in the DRX state is only the second carrier, but a plurality of carriers in the DRX state may exist instead. For example, the first carrier may be in a non-DRX state, and the second carrier and the third carrier may be in a DRX state. In this case, the on-duration of the second carrier and the third carrier may be common. That is, when there are a plurality of component carriers in the DRX state, the on-duration of each component carrier may be common.

  In the above-described example, as the operation of the mobile station UE and the radio base station eNB, when the second carrier as the secondary component carrier is in the DRX state, measurement before and after the DRX ON section (On-duration) is performed. Although the operation of regarding as a gap is shown, instead, the measurement for measuring the second carrier is performed when the second carrier, which is the secondary component carrier, is in the De-activated state, that is, not activated. An operation may be performed in which a section is defined and before and after the measurement section is regarded as a measurement gap. In this case, instead of before and after the measurement interval, the first interval and the last interval in the measurement interval may be regarded as the measurement gap. The measurement interval for measuring the second carrier is applied only when the second carrier is in the De-activated state, and the second carrier is in the Activated state, similarly to the ON interval (On-duration) in DRX control. If it is, it may not be applied.

  That is, the mobile station, the radio base station, and the communication control method according to the present embodiment are not limited to the case where the secondary component carrier is in the DRX state, and are applied when the secondary component carrier is in the De-activated state. May be. Alternatively, the mobile station, the radio base station, and the communication control method according to the present embodiment are not limited to the case where the secondary component carrier is in the DRX state / non-DRX state, and the secondary component carrier always communicates. It may be applied to a state where communication is performed / a state where communication is performed intermittently. Here, intermittent communication may be, for example, a state in which control signal monitoring, cell search, and measurement are intermittently performed and normal data communication is not performed.

  Below, the effect of applying the mobile station UE, the radio base station eNB, and the communication control method in the present embodiment will be described.

  As described above, by setting the section before and after the On-duration of the second carrier to which DRX is applied as the gap section equivalent to the measurement gap, the radio base station eNB and the mobile station UE can make the first carrier It is possible to explicitly stop the uplink and downlink communications of the mobile station UE, and it is possible to avoid the event that the mobile station UE loses packets in a state where the radio base station eNB cannot manage.

  In addition, when the second carrier transitions from the DRX state to the Non-DRX state, the on-duration does not exist and therefore the accompanying gap section does not exist. As a result, when both the first carrier and the second carrier are in the Non-DRX state, it is possible to reduce the throughput loss due to the gap section.

  In addition, compared to the conventional measurement gap, it is possible to define a gap section adapted to the operation of the intermittent reception control, and it is possible to reduce the size of the gap section to the minimum, and in the first carrier Throughput can be increased.

Furthermore, by increasing the size of the previous section before and after the previous section, the mobile station UE can measure Path loss before the on-duration, and the uplink in the on-duration It is possible to improve the accuracy of the transmission power of the transmission.
(Change example)
A modification example of the mobile station UE, the radio base station eNB, and the communication control method according to the present invention is shown below.

  In this modification, instead of the above-described sections before and after the on-duration and on-duration shown in FIG. 5 to FIG. The measurement section for (Component Carrier) is applied.

  The four sections may be referred to as a first section, a second section, a third section, and a fourth section from the beginning. Note that the SCC measurement section is also applied only when the second carrier is in the DRX state, similar to the on-duration shown in FIGS. 5 to 6 and the section before and after the on-duration.

  For example, the sizes of the first section, the second section, the third section, and the fourth section may be 2 ms, 4 ms, 5 ms, and 2 ms, respectively. Alternatively, the sizes of the first section, the second section, the third section, and the fourth section may be values other than those described above.

  The first section and the fourth section of the SCC measurement section are equivalent to the sections before and after the above-described on-duration. That is, the first interval and the fourth interval are regarded as the time when the receiver of the mobile station UE switches the center frequency and the like, and the first carrier communication is not performed. That is, the first section and the fourth section are regarded as measurement gaps, and the first carrier communication is not performed. That is, the radio base station eNB and the mobile station UE do not perform communication of the first carrier in the first section and the fourth section. In the first interval and the fourth interval, the second carrier is not communicated for the same reason.

  The second and third sections of the SCC measurement section are equivalent to the above-described on-duration for the first carrier. In this case, the second section and the third section are in the state of FIG. 2 as the receiver of the mobile station UE, and the first carrier communication is performed. That is, the radio base station eNB and the mobile station UE perform communication of the first carrier in the second section and the third section. That is, the second section and the third section are not a measurement gap for the first carrier, but are regarded as a normal section, and communication of the first carrier is performed.

  On the other hand, the second section and the third section of the SCC measurement section are equivalent to the above-described on-duration for the second carrier. However, when the second carrier is in the De-activated state, the mobile station UE performs measurement related to the second carrier, for example, cell search, measurement, measurement of path loss with the serving cell, and the like, and starts communication. It is desirable to measure the second carrier again before improving the accuracy and improve the communication quality. Therefore, in the second section of the SCC measurement section, the second carrier is measured in the mobile station UE, and the second carrier is not communicated between the mobile station UE and the radio base station eNB. That is, the radio base station eNB and the mobile station UE do not communicate with the second carrier in the second section. Then, communication of the second carrier is performed in the third section of the SCC measurement section. That is, the radio base station eNB and the mobile station UE perform communication of the second carrier in the third section. The mobile station UE may measure the second carrier even in the third section of the SCC measurement section.

  That is, the mobile station UE performs cell search, measurement, and path loss measurement on the second carrier in the second section of the SCC measurement section, and performs uplink transmission and downlink reception on the second carrier. Not performed. Then, the mobile station UE performs uplink transmission and downlink reception on the second carrier in the third section of the SCC measurement section. In addition, the radio base station eNB does not perform uplink reception or downlink transmission on the second carrier in the second section of the SCC measurement section, and does not perform transmission of the second carrier in the third section of the SCC measurement section. Uplink reception and downlink transmission are performed.

  It should be noted that the downlink communication may be performed in both the second section and the third section because the above-described path loss measurement or the like is unnecessary. In this case, only uplink communication is not performed in the second interval. That is, the mobile station UE performs cell search and measurement of the second carrier, path loss measurement and downlink reception in the second section of the SCC measurement section, and performs uplink transmission in the second carrier. Absent. The mobile station UE performs both uplink transmission and downlink reception on the second carrier in the third section of the SCC measurement section. Also, the radio base station eNB performs downlink transmission on the second carrier in the second section of the SCC measurement section, and does not receive uplink, and in the third section of the SCC measurement section. In the second carrier, both uplink reception and downlink transmission are performed.

  That is, in the modified example, the on-duration is further divided into two, and the first of the two divided is used for the measurement of the second carrier and is divided into two. The second section is used for communication of the second carrier. Regarding the first carrier, communication of the first carrier may be performed in both the first section and the second section divided into the two. The second carrier communication may be transmission of an uplink data signal triggered by an uplink scheduling grant, or transmission of a downlink data signal notified by downlink scheduling information. Good. That is, whether or not the uplink scheduling grant and downlink scheduling information can be transmitted and the first, second, third, and fourth sections of the SCC measurement section are defined, and the above-described SCC Whether to allow communication in the measurement section may be set.

  The characteristics of the present embodiment described above may be expressed as follows.

(Item 1)
A mobile station that communicates with a radio base station using two or more carriers,
When the two or more carriers are constituted by a carrier that is not in an intermittent reception state and a carrier that is in an intermittent reception state,
A first communication unit that communicates with a carrier that is not in the intermittent reception state;
A second communication unit for communicating with the carrier in the intermittent reception state,
The mobile station, wherein the first communication unit is configured to regard a section before and after an ON section of a carrier in the intermittent reception state as a measurement gap.

(Item 2)
The first communication unit is
In a carrier that is not in the intermittent reception state, a first downlink receiving unit that performs downlink reception;
In a carrier that is not in the intermittent reception state, a first uplink transmission unit that performs uplink transmission;
A first measurement unit that performs measurement in a carrier that is not in the intermittent reception state;
The carrier that is not in the intermittent reception state is configured to include a first monitoring unit that performs radio link monitoring,
The second communication unit is
A second downlink receiving unit that performs downlink reception in the carrier in the intermittent reception state;
A second uplink transmitter that performs uplink transmission in the carrier in the intermittent reception state;
A second measurement unit that performs measurement in the carrier in the intermittent reception state;
The mobile station according to item 1, wherein the carrier in the intermittent reception state is configured to include a second monitoring unit that performs radio link monitoring.

(Item 3)
The carrier that is not in the intermittent reception state is
The parameter related to intermittent reception control is not set, or
A parameter related to intermittent reception control is set and a timer for intermittent reception control is operating, or
A parameter related to intermittent reception control is set and a scheduling request is pending, or
A state in which parameters related to discontinuous reception control are set and the HARQ retransmission timing of the uplink, or
A parameter related to intermittent reception control is set, and after receiving a random access response for the specified preamble, a downlink control signal for new transmission addressed to the own station is not received,
A carrier in at least one of the states of
The mobile station according to item 1, wherein the carrier in the intermittent reception state is a carrier in a state other than the above.

(Item 4)
The measurement gap is
Item 2. The mobile station according to Item 1, wherein the mobile station is a time interval provided for measuring carriers of different frequencies and carriers of different wireless communication systems.

(Item 5)
The first communication unit is
Item 2. The mobile station according to Item 1, wherein communication in a carrier that is not in the intermittent reception state is not performed in the interval before and after the ON interval.

(Item 6)
The first uplink transmission unit includes:
Item 3. The mobile station according to Item 2, wherein uplink transmission is not performed in a carrier that is not in the discontinuous reception state before and after the ON interval.

(Item 7)
Regarding the section before and after the ON section,
The mobile station according to item 1, wherein the length of the section before the on section is larger than the length after the on section.

(Item 8)
A communication control method in a mobile station that communicates with a radio base station using two or more carriers,
When the two or more carriers are constituted by a carrier that is not in an intermittent reception state and a carrier that is in an intermittent reception state,
A first step of communicating with a carrier that is not in the intermittent reception state;
A second step of communicating with the carrier in the intermittent reception state,
In the first step, the communication control method is configured so that a section before and after an ON section of a carrier in the intermittent reception state is regarded as a measurement gap.

(Item 9)
A radio base station that communicates with a mobile station using two or more carriers,
When the two or more carriers are constituted by a carrier that is not in an intermittent reception state and a carrier that is in an intermittent reception state,
A first communication unit that communicates with a carrier that is not in the intermittent reception state;
A second communication unit for communicating with the carrier in the intermittent reception state,
The radio base station, wherein the first communication unit is configured to regard a section before and after an on section of a carrier in the intermittent reception state as a measurement gap.

(Item 10)
The first communication unit is
A first downlink transmission unit that performs downlink transmission in a carrier that is not in the intermittent reception state;
A carrier that is not in the intermittent reception state, and configured to include a first uplink receiving unit that performs uplink reception;
The second communication unit is
A second downlink transmitter that performs downlink transmission in the carrier in the intermittent reception state;
Item 10. The radio base station according to Item 9, wherein the carrier in the intermittent reception state is configured to include a second uplink reception unit that performs uplink reception.

(Item 11)
The first communication unit is
Item 10. The radio base station according to Item 9, wherein communication is not performed on a carrier that is not in the intermittent reception state in the interval before and after the ON interval.

(Item 12)
The first downlink transmission unit is
Item 10. The radio base station according to Item 9, wherein uplink and downlink scheduling is performed so that communication in a carrier that is not in the intermittent reception state is not performed in the interval before and after the ON interval.

(Item 13)
Regarding the section before and after the ON section,
10. The radio base station according to item 9, wherein a length of the section before the on section is larger than a length after the on section.

(Item 14)
A communication control method in a radio base station that communicates with a mobile station using two or more carriers,
When the two or more carriers are constituted by a carrier that is not in an intermittent reception state and a carrier that is in an intermittent reception state,
A first step of communicating with a carrier that is not in the intermittent reception state;
A second step of communicating with the carrier in the intermittent reception state,
The communication control method according to claim 1, wherein in the first step, a section before and after an on section of the carrier in the intermittent reception state is regarded as a measurement gap.

(Item 15)
A mobile station that communicates with a radio base station using two or more carriers,
When the two or more carriers are constituted by a carrier that is not in an intermittent reception state and a carrier that is in an intermittent reception state,
A first communication unit that communicates with a carrier that is not in the intermittent reception state;
A second communication unit for communicating with the carrier in the intermittent reception state,
The second communication unit regards a section before and after the on-section of the carrier in the intermittent reception state as a measurement gap, and in the section before the on-section of the carrier in the intermittent reception state, A mobile station configured to perform a measurement related to a certain carrier.

  Note that the operations of the mobile station UE and the radio base station eNB described above may be applied to mobile stations, radio base stations, and control stations other than systems to which LTE-Advanced is applied. For example, the present invention may be applied to mobile stations, radio base stations, and control stations in LTE, WCDMA (registered trademark), CDMA2000, and WiMAX.

  The operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE or the radio base station eNB. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE or the radio base station eNB.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station 102 ... first communication unit 102A ... first downlink reception unit 102B ... first uplink transmission unit 102C ... first measurement unit 104A ... second downlink reception unit 104B ... second uplink transmission unit 104C ... Second measuring unit 106 ... DRX control unit 108 ... gap control unit eNB ... radio base station 202A ... first downlink transmission unit 202B ... first uplink reception unit 204A ... second downlink transmission unit 204B ... second uplink reception Unit 206 ... DRX control unit 208 ... Gap control unit

Claims (1)

A mobile station that communicates with a radio base station using two or more component carriers,
If the two or more component carriers are configured by the component carrier is a discontinuous reception state and the component carrier is not a discontinuous reception state,
A first communication unit that communicates with a component carrier that is not in the intermittent reception state;
A second communication unit that communicates with the component carrier in the intermittent reception state,
The mobile station, wherein the first communication unit is configured to regard a section before and after an ON section of a component carrier in the intermittent reception state as a measurement gap.

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