JP2012004767A - Communication system, mobile station device, base station device and measurement setting management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system and a measurement setting management method capable of reusing set measurement setting information in a case where a mobile station device is wirelessly connected with a base station device using cells of plural frequency bands.SOLUTION: In a communication system in which a base station device sets measurement setting information necessary to measure cells of plural frequency bands to a mobile station device for each frequency band, and the mobile station device uses simultaneously the cells of plural frequency bands to connect and communicate with the base station device, a base station device 2 transmits a handover instruction message S5 for specifying change of a first cell frequency band or a second cell frequency band to a mobile station device 1, and the mobile station device 1 uses a measurement setting management method for determining whether or not measurement setting information S1 set for the frequency band to be used as the first cell or the second cell after a handover is used for the frequency band to be used as the first cell or the second cell before the handover.

Description

  The present invention relates to a communication system, a mobile station apparatus, a base station apparatus, and a measurement method, and in particular, frequency band measurement setting when the mobile station apparatus is wirelessly connected to the base station apparatus using a plurality of frequency band cells. It relates to the management method.

  Evolved which realized high-speed communication by adopting OFDM (Orthogonal Frequency-Division Multiplexing) communication method and flexible scheduling of predetermined frequency and time unit called resource block in 3GPP (3rd Generation Partnership Project) which is a standardization project Universal Terrestrial Radio Access (hereinafter referred to as EUTRA) has been studied, and further development of Advanced EUTRA (also referred to as LTE-Advanced) is being promoted.

  In Advanced EUTRA, a technique called carrier aggregation is proposed as a technique capable of higher-speed data transmission while maintaining compatibility with EUTRA. Carrier aggregation is a method of receiving data of a transmitting device respectively transmitted from cells in a plurality of different frequency bands (also referred to as carrier frequency and component carrier) in receiving devices corresponding to different frequency bands. This is a technique for improving the data rate. In the following description, a receiving apparatus in downlink transmission is referred to as a mobile station apparatus, a transmitting apparatus in downlink transmission is referred to as a base station apparatus, and a receiving apparatus in uplink transmission is referred to as a base station apparatus or uplink transmission. Although the transmitting apparatus is described as a mobile station apparatus, the scope of application of the present invention is not necessarily limited to these apparatuses.

  An advanced EUTRA mobile station apparatus (hereinafter referred to as a mobile station apparatus) needs to perform reception and measurement of a plurality of component carriers in order to perform a measurement report required for mobility control (mobility control). There is a need for a measurement setting management method that is more complicated than EUTRA.

  For example, at the time of a handover, an EUTRA mobile station apparatus uses measurement setting information of a frequency band of a cell (source cell, in-zone cell) before handover as a frequency of a cell (target cell, peripheral cell) after handover. The band is configured to be reused (link) (Non-patent Document 1). The measurement setting information is set for the frequency band, and is a reporting configuration (reporting configuration) including a measurement ID, a measurement object frequency (measurement object), a measurement object frequency ID, and a measurement event (measurement event) to be detected. ) And a report setting ID. That is, the measurement ID related to the frequency band of the cell before the handover is swapped with the measurement ID related to the frequency band of the cell after the handover.

  However, when trying to apply the above-described method to a mobile station apparatus that is performing carrier aggregation, the mobile station apparatus is in a state in which a plurality of cells are set both before and after handover. Unlike EUTRA, since it is necessary to determine which frequency band of measurement setting information is to be reused, the EUTRA method cannot be used as it is.

  Non-Patent Document 2 to Non-Patent Document 5 describe a method of reusing measurement setting information set in each cell before and after handover in order to deal with this problem.

R2-085558, NTT DOCOMO, INC, 3GPP TSG-RAN WG2 Meeting # 63bis, Praque, Czech Public, 29 Sep-3 Oct 2008 R2-102870, Qualcomm Incorporated, 3GPP TSG-RAN WG2 Meeting # 70, Montreal, Canada, 10th-14th May 2010 R2-103089, Ericsson, ST-Ericsson, 3GPP TSG-RAN WG2 Meeting # 70, Montreal, Canada, 10th-14th May 2010 R2-10284, Huawei, 3GPP TSG-RAN WG2 Meeting # 70, Montreal, Canada, 10th-14th May 2010 R2-103065, NTT DOCOMO, INC. , 3GPP TSG-RAN WG2 Meeting # 70, Montreal, Canada, 10th-14th May 2010

  However, Non-Patent Document 2 to Non-Patent Document 5 described above have the following problems.

  Non-Patent Documents 2 and 3 propose measurement setting management methods for exchanging and reusing measurement setting information of the frequency band of the source cell and the frequency band of the target cell after handover. However, the methods shown in Non-Patent Documents 2 and 3 can be exchanged depending on the contents of the set measurement event, such as an in-frequency event when the frequency band of the source cell becomes a frequency band that is not subject to carrier aggregation. There is a problem in that no distinction is made between those that are not exchangeable and those that are not exchangeable, and the specific exchange method is not considered.

  On the other hand, Non-Patent Document 4 proposes a measurement setting management method for exchanging the measurement setting information of the frequency band of the source cell after the handover if it is exchangeable, and deleting the measurement event if the exchange is not possible. ing. However, since the method shown in Non-Patent Document 4 requires determination as to whether or not exchange is possible, there is a problem that the management method becomes complicated.

  Non-Patent Document 5 proposes a method of deleting all measurement setting information set in the frequency band of the target cell. However, the method shown in Non-Patent Document 5 has a problem that even a measurement event that can actually be used is deleted.

  In view of the above problems, the present invention can reuse measurement setting information set by a simple method when the mobile station device is wirelessly connected to the base station device using cells of a plurality of frequency bands. An object of the present invention is to provide a simple communication system, mobile station apparatus, base station apparatus, and measurement setting management method.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, in the communication system of the present invention, the base station device sets, for each frequency band, measurement setting information necessary for measurement of cells in a plurality of frequency bands for the mobile station device, and the mobile station device performs the plurality of frequencies. A communication system that performs communication by connecting to the base station apparatus using a cell in a band at the same time, wherein the type of the cell is a first cell that is always activated and a second cell that can be deactivated The base station apparatus designates a change in the frequency band of the first cell or the frequency band of the second cell to the mobile station apparatus. Determines execution of handover, transmits a handover instruction message instructing execution of the handover to the mobile station apparatus, the mobile station apparatus receives the handover instruction message, and performs handover The measurement setting information set in the frequency band used later as the first cell or the second cell is transferred to the frequency band of the first cell or the frequency band of the second cell before the handover. In contrast, a measurement setting management method for determining whether or not to use is used.

  (2) In the communication system of the present invention, when the mobile station apparatus has measurement setting information set in a frequency band used as the first cell or the second cell after handover, The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. If the measurement setting information is not set in the frequency band used for the band and used as the first cell or the second cell after handover, the frequency of the first cell before handover A measurement setting management method for deleting measurement setting information set in the band or the frequency band of the second cell is used.

  (3) Further, in the communication system of the present invention, when the mobile station apparatus is set with an identifier indicating that measurement setting information can be exchanged for a frequency band of a target cell in the handover instruction message The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is changed to the frequency band of the first cell or the second cell before the handover. If the identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is not set in the handover instruction message, the first before handover is set. Measurement setting management method for deleting measurement setting information set in the frequency band of the second cell or the frequency band of the second cell Which comprises using.

  (4) In the communication system of the present invention, the mobile station apparatus cannot exchange measurement setting information set in the frequency band of the target cell in the handover instruction message for the frequency band of the source cell. If the identifier indicating that is set, the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before the handover is deleted, and the handover instruction message If the identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is not set, the first cell or the first cell after the handover The measurement setting information set in the frequency band used as the second cell is stored in the first cell before the handover. Characterized by using the measurement configuration management method for use against several bands or frequency band of the second cell.

  (5) In the communication system of the present invention, the identifier is a measurement ID, a measurement target frequency ID, a cell ID, or a component carrier identifier.

  (6) In the communication system of the present invention, a plurality of identifiers are set for each frequency band.

  (7) In the mobile station apparatus of the present invention, the base station apparatus sets, for each frequency band, measurement setting information necessary for measuring a cell in a plurality of frequency bands with respect to the mobile station apparatus. A mobile station apparatus in a communication system that communicates by connecting to the base station apparatus using the cells of the plurality of frequency bands simultaneously, the cell type being set to a first cell that is always activated, and a non-active cell type. The cell is classified into a second cell that can be activated and a third cell other than the second cell, and the base station apparatus designates a change in the frequency band of the first cell or the frequency band of the second cell. The handover is determined to be executed, the handover instruction message for instructing the execution of the handover is received, and the frequency band used as the first cell or the second cell after the handover is set. The measurement configuration information, which comprises using the measurement configuration management method for determining whether to use for the frequency band of the frequency band or the second cell of the first cell before handover.

(8) The mobile station apparatus of the present invention
When measurement setting information is set in the frequency band used as the first cell or the second cell after handover, it is used as the first cell or the second cell after handover Utilizing the measurement setting information set in the frequency band for the frequency band of the first cell or the frequency band of the second cell before handover,
When measurement setting information is not set in the frequency band used as the first cell or the second cell after handover, the frequency band of the first cell before handover or the second cell A measurement setting management method for deleting the measurement setting information set in the frequency band is used.

  (9) In addition, the mobile station apparatus of the present invention, after the handover, when an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is set in the handover instruction message The measurement setting information set in the frequency band used as the first cell or the second cell is set to the frequency band of the first cell or the frequency band of the second cell before the handover. When the identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is not set in the handover instruction message, the frequency band of the first cell before the handover is used. Alternatively, a measurement setting management method for deleting measurement setting information set in the frequency band of the second cell is used.

  (10) In the mobile station apparatus of the present invention, the identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell in the handover instruction message. If set, the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before the handover is deleted, and the frequency of the target cell is added to the handover instruction message. When the identifier indicating that the measurement setting information set in the band cannot be exchanged for the frequency band of the source cell is not set, it is used as the first cell or the second cell after the handover. The measurement setting information set in the frequency band to be used is the frequency band of the first cell before the handover or the second Characterized by using the measurement configuration management method for use for the frequency band of Le.

  (11) Further, the base station apparatus of the present invention sets, for each frequency band, measurement setting information necessary for the cell station apparatus to measure a cell in a plurality of frequency bands, and the mobile station apparatus A base station apparatus in a communication system that communicates by connecting to the base station apparatus using the cells of the plurality of frequency bands at the same time, and the type of the cell is the first cell that is always activated, The mobile station apparatus is classified into a second cell that can be activated and a third cell other than the second cell, and the mobile station apparatus is changed in the frequency band of the first cell or the frequency band of the second cell. Determines the execution of the designated handover, transmits a handover instruction message for instructing the execution of the handover to the mobile station apparatus, and is used as the first cell or the second cell after the handover. Measurement that causes the mobile station apparatus to determine whether to use the measurement setting information set for several bands for the frequency band of the first cell or the frequency band of the second cell before handover A setting management method is used.

  (12) Moreover, the measurement setting management method of the mobile station apparatus of this invention sets the measurement setting information required for the measurement of the cell of a some frequency band with respect to a mobile station apparatus with respect to a mobile station apparatus for every frequency band, A measurement setting management method for a mobile station apparatus in a communication system in which the mobile station apparatus performs communication by connecting to the base station apparatus using the cells of the plurality of frequency bands simultaneously, and the type of the cell is always active The first cell to be activated, the second cell that can be inactivated, and the third cell other than the first cell, and the mobile station device is configured to transmit the first cell from the base station device. Determining execution of a handover designating a change in a frequency band or a frequency band of the second cell; receiving a handover instruction message instructing execution of the handover; and handover The measurement setting information set in the frequency band used later as the first cell or the second cell is transferred to the frequency band of the first cell or the frequency band of the second cell before the handover. And a step of determining whether or not to use.

  (13) Moreover, the measurement setting management method of the mobile station apparatus of this invention WHEREIN: When measurement setting information is set to the frequency band utilized as a said 1st cell or a said 2nd cell after hand-over, The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. A step of using the band, and if the measurement setting information is not set in the frequency band used as the first cell or the second cell after the handover, the first cell before the handover And the step of deleting measurement setting information set in the frequency band of the second cell or the frequency band of the second cell.

  (14) Also, in the measurement setting management method for a mobile station apparatus of the present invention, an identifier indicating that measurement setting information can be exchanged for a frequency band of a target cell is set in the handover instruction message. The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is changed to the frequency band of the first cell or the second cell before the handover. When the identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is not set in the handover instruction message, Deleting the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell; Characterized in that it comprises a.

  (15) Also, in the measurement setting management method for a mobile station apparatus according to the present invention, the measurement setting information set in the frequency band of the target cell in the handover instruction message cannot be exchanged for the frequency band of the source cell. If the identifier indicating that is set, the step of deleting the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before the handover, and the handover If the identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is not set in the instruction message, the first cell or The measurement setting information set in the frequency band used as the second cell is stored in the first cell before the handover. A step of utilizing for the frequency band of the frequency band or the second cell, characterized in that it comprises a.

  As described above, according to the present invention, when the mobile station apparatus is wirelessly connected to the base station apparatus using cells of a plurality of frequency bands, the measurement setting information set by a simple method is reused. A possible communication system, mobile station apparatus, base station apparatus, and measurement setting management method can be provided.

It is the block diagram which showed an example of the mobile station apparatus 1 which concerns on embodiment of this invention. It is the block diagram which showed an example of the base station apparatus 2 which concerns on embodiment of this invention. It is the figure which showed the measurement setting management method in the case of reusing the measurement setting information before the handover which concerns on the 1st Embodiment of this invention after a handover. It is a figure for demonstrating the measurement setting information set to the mobile station apparatus 1 which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the measurement setting information after the handover set to the mobile station apparatus 1 which concerns on the 1st Embodiment of this invention. It is another figure for demonstrating the measurement setting information after the handover set to the mobile station apparatus 1 which concerns on the 1st Embodiment of this invention. It is another figure for demonstrating the measurement setting information after the handover set to the mobile station apparatus 1 which concerns on the 1st Embodiment of this invention. It is the figure which showed the measurement setting management method in the case of reusing the measurement setting information before the handover which concerns on the 2nd Embodiment of this invention after a handover. It is a figure for demonstrating the measurement setting information after the handover set to the mobile station apparatus 1 which concerns on the 2nd Embodiment of this invention. It is the figure which showed the measurement setting management method in the case of reusing the measurement setting information before the handover which concerns on the 3rd Embodiment of this invention after a handover. It is a figure for demonstrating the measurement setting information after the handover set to the mobile station apparatus 1 which concerns on the 3rd Embodiment of this invention. It is the sequence chart figure which showed an example of the measurement setting management method of the conventional mobile station apparatus 1 and the base station apparatus 2 before and after a hand-over. It is the figure which showed an example of the measurement setting information set to the mobile station apparatus 1 before the conventional handover. It is the figure which showed an example of the measurement setting information set to the mobile station apparatus 1 after the conventional handover. It is a figure which shows an example of the communication network structure which concerns on embodiment of this invention.

  Before describing embodiments of the present invention, a physical channel, a measurement setting management method at the time of handover, and carrier aggregation will be described.

[Physical channel]
A physical channel (or physical signal) used in EUTRA and Advanced EUTRA will be described. The physical channel includes a downlink channel in the downlink transmitted from the base station apparatus to the mobile station apparatus, and an uplink channel in the uplink transmitted from the mobile station apparatus to the base station apparatus. The physical channel may be added or changed in the future in EUTRA and Advanced EUTRA. However, even if the physical channel is changed, the description of each embodiment of the present invention is not affected.

  Synchronization signals (Synchronization Signals) are composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately in the frequency domain. Depending on the combination, 504 kinds of cell identifiers (cell ID, PCI; Physical Cell Identifier) for identifying the base station apparatus and frame timing for radio synchronization are shown. The mobile station device specifies the cell ID of the synchronization signal received by the cell search.

  A physical broadcast information channel (PBCH; Physical Broadcast Channel) is transmitted for the purpose of notifying control parameters (broadcast information (system information): System information) commonly used by mobile station apparatuses in a cell. The broadcast information not notified by the physical broadcast information channel is transmitted by a layer 3 message (system information) using the downlink data channel, with the radio resource notified by the downlink control channel. As broadcast information, a cell global identifier (CGI) indicating a cell-specific identifier, a tracking area identifier (TAI) for managing a paging standby area, a cell frequency bandwidth, downlink and uplink The correspondence relationship of the frequency band is notified.

  The downlink reference signal is a pilot signal transmitted at a predetermined power for each cell. The downlink reference signal is a known signal that is periodically repeated at a frequency / time position based on a predetermined rule. The mobile station apparatus measures the reception quality for each cell by receiving the downlink reference signal. The mobile station apparatus also uses the downlink reference signal as a reference signal for demodulation of the downlink control channel or downlink data channel transmitted simultaneously with the downlink reference signal. As a sequence used for the downlink reference signal, a sequence that can be identified for each cell is used. In addition, although a downlink reference signal may be described as cell-specific reference signal (RS), the use and meaning are the same.

  A downlink control channel (PDCCH; Physical Downlink Control Channel) is transmitted in several OFDM symbols from the beginning of each subframe. Radio resource allocation information according to the scheduling of the base station device and transmission to the mobile station device Used to indicate the amount of power increase / decrease adjustment. The mobile station apparatus monitors (monitors) the downlink control channel addressed to itself before transmitting / receiving the layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and By receiving the downlink control channel, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant at the time of reception.

  A downlink data channel (PDSCH: Physical Downlink Shared Channel) is used to notify paging and broadcast information as a layer 3 message that is downlink control data in addition to downlink data. The radio resource allocation information of the downlink data channel is indicated by the downlink control channel.

  An uplink data channel (PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. Similarly to the downlink, the radio resource allocation information of the uplink data channel is indicated by the downlink control channel.

  A random access channel (PRACH) is a channel used for notifying a preamble sequence and has a guard time. The random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus. The mobile station apparatus uses a random access channel for a request for scheduling transmission data when the uplink control channel is not set and a request for transmission timing adjustment information necessary for matching the uplink transmission timing with the reception timing window of the base station apparatus. . The mobile station apparatus that has received the transmission timing adjustment information sets an effective time of the transmission timing adjustment information, and manages the state as a transmission timing adjustment state during the effective time and as a transmission timing non-adjustment state outside the effective period. The base station device can also start random access by assigning a dedicated preamble sequence (Dedicated preamble) to the mobile station device. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Measurement setting management method during handover]
FIG. 12 is a sequence chart for explaining a measurement setting management method for the mobile station apparatus 1 and the base station apparatus 2 before and after handover in EUTRA.

  In the example of FIG. 12, it is assumed that the base station apparatus 2 can use two different frequencies F1 and F2 as frequencies operated by the own station, and the mobile station apparatus 1 and the base station apparatus 2 are wirelessly connected at the frequency F1. Is established (radio resource control connected state (Radio Resource Control Connected: RRC_Connected)). Here, the base station apparatus 2 transmits a measurement setting message to cause the mobile station apparatus 1 to measure the reception quality of the cell (located cell) in communication and other cells (neighboring cells) (step S1). . The measurement setting message includes at least one measurement setting information for each frequency (frequency F1 and frequency F2) to be measured. The measurement setting information includes a measurement ID, a measurement object frequency (measurement object), a measurement object frequency ID corresponding to the measurement object frequency, a report setting including a measurement event, and a report setting ID corresponding to the report setting. Is done. A plurality of report setting IDs may be linked to one measurement target frequency ID. Similarly, one report setting ID may be linked to a plurality of measurement target frequency IDs.

  The measurement event is, for example, when the reception quality of the serving cell is below / above a predetermined threshold, or when the reception quality of the neighboring cell is lower than the serving cell, the reception quality of the neighboring cell is a predetermined threshold. It is information composed of a condition such as when the value exceeds, and a parameter used to determine the condition. The parameter is set with a threshold, an offset value, a time required for establishment of a measurement event, and the like.

  In step S2, the mobile station apparatus 1 stores the measurement setting information set from the base station apparatus 2 as internal information, and then starts the measurement process. Specifically, the mobile station apparatus 1 manages the measurement ID, the measurement target frequency ID, and the report setting ID so that they are linked together, and starts measurement based on the measurement information corresponding to each ID. . If these three IDs are linked to one, it is considered valid and the associated measurement is started. If these three IDs are not linked to one (one of the IDs is not set) ), The relevant measurement is not started as invalid. If the measurement setting information can be set without error, the mobile station apparatus 1 transmits a measurement setting completion message to the base station apparatus 2 in step S3.

  When any of the set measurement events satisfies the condition according to the parameter, the mobile station device 1 transmits a measurement report message to the base station device 2 assuming that the measurement event is triggered. (Step S4). In the measurement report message, at least the measurement ID linked to the report setting ID of the triggered measurement event and, if necessary, the measurement result of the associated cell are set. Since the base station device 2 knows to which measurement event report setting ID the measurement ID is linked, the mobile station device 1 does not need to notify the report setting ID in the measurement report message.

  The base station apparatus 2 considers the measurement report message from the mobile station apparatus 1, the system load, the state of interference, etc., and performs handover indicating the execution of inter-frequency handover to the mobile station apparatus 1. An instruction message is transmitted (step S5). FIG. 12 shows an example in which a different frequency handover is performed from the frequency F1 of the base station apparatus 2 to a different frequency F2 of the same base station apparatus 2, but the mobile station apparatus 1 is different from the base station apparatus 2 to the different base station apparatus 2. Even in frequency handover, it is necessary to perform the same control procedure. When the different frequency handover is instructed by the received handover instruction message, the mobile station apparatus 1 executes the different frequency handover and changes the measurement setting (step S6).

  In the measurement setting change, the mobile station apparatus 1 updates the associated link by exchanging the measurement ID related to the frequency band before the handover and the measurement ID related to the frequency band after the handover. When the different frequency handover is completed, a handover completion message is transmitted to the handover destination base station apparatus 2 to complete the handover procedure (step S7).

  FIGS. 13 and 14 are diagrams for explaining a method for changing the measurement setting information of mobile station apparatus 1 and base station apparatus 2 at the time of different frequency handover in EUTRA in step S6 shown in FIG. When the measurement setting information shown in FIG. 13 is set for the EUTRA mobile station apparatus before the different frequency handover, the EUTRA mobile station apparatus after the different frequency handover sets the measurement setting information as shown in FIG. Is configured to be changed and reused.

  More specifically, as shown in FIG. 13, the mobile station apparatus 1 measures the cell A and the cell B at the frequency F1, and measures the cell C and the cell D at the frequency F2. The cell A is a serving cell of the mobile station device 1, and the other cells are neighboring cells. Here, the mobile station apparatus 1 is set with a measurement event (report setting ID # 1) for comparing the cell A in the vicinity and the neighboring cell of the frequency F1 (cell B in the example in the figure). The report setting ID is linked to measurement ID # 1. When the ID indicating the frequency F1 is set to the frequency ID # 1, the mobile station device 1 links and manages the measurement ID # 1-frequency ID # 1-report setting ID # 1.

  Similarly, the mobile station apparatus 1 is set with a measurement event (report setting ID # 2) for comparing the cell A and the neighboring cells of the frequency F2 (cell C and cell D in the example in the figure) The measurement event report setting ID is linked to measurement ID # 2. When the ID indicating the frequency F2 is the frequency ID # 2, the mobile station apparatus 1 links and manages the measurement ID # 2-frequency ID # 2-report setting ID # 2.

  Next, FIG. 14 shows the measurement setting information after the change when the mobile station apparatus 1 performs a different frequency handover from the cell A at the frequency F1 to the cell C at the frequency F2. The mobile station apparatus 1 exchanges the measurement ID related to the frequency F1 of the serving cell before the different frequency handover with the frequency F2 of the serving cell after the different frequency handover and reuses it. That is, the mobile station apparatus 1 links and manages measurement ID # 1-frequency ID # 2-report setting ID # 1 and measurement ID # 2-frequency ID # 1-report setting ID # 2.

[Career aggregation]
Carrier aggregation is a technology that aggregates (aggregates) a plurality of different uplink or downlink frequency bands (component carriers) and treats them as one frequency band. For example, when five component carriers having a frequency bandwidth of 20 MHz are aggregated by carrier aggregation, the mobile station apparatus can access the mobile station apparatus by regarding it as a frequency bandwidth of 100 MHz. The component carriers to be aggregated may be a continuous frequency band, or may be a frequency band in which all or part of them are discontinuous. For example, when the usable frequency band is the 800 MHz band, the 2.6 GHz band, and the 3.4 GHz band, one component carrier is the 800 MHz band, another component carrier is the 2 GHz band, and another component carrier is 3.4 GHz. It may be transmitted in a band.

  It is also possible to aggregate continuous or discontinuous component carriers in the same frequency band, for example, 2.6 GHz band. The frequency bandwidth of each component carrier may be a frequency bandwidth narrower than 20 MHz, or may be different from each other. Further, the mobile station apparatus can access each component carrier.

  The base station apparatus allocates (configure, configure) uplink or downlink to the mobile station apparatus based on various factors such as the transmission data buffer amount of the mobile station apparatus, the reception quality of the mobile station apparatus, the load in the cell and QoS. The number of component carriers in the link can be increased or decreased.

  Component carriers are classified into three types: primary component carriers (PCCs), secondary component carriers (SCCs), non-configured component carriers (NCCs), and non-configured component carriers (NCCs). The primary component carrier is typically composed of a pair of uplink component carrier and downlink component carrier specified by broadcast information, and the mobile station apparatus performs measurement control or downlink radio link failure (Radio Link Failure). This is a frequency band that serves as a reference for detection of uplink and uplink transmission timing. Further, it is a frequency band in which uplink control information is transmitted using an uplink control channel. The base station apparatus can also set a primary component carrier for each mobile station apparatus. The mobile station apparatus can acquire and set security information from the cell of the primary component carrier.

  The secondary component carrier is a frequency band assigned to a mobile station device other than the primary component carrier. The mobile station device does not need to detect a radio link failure with the secondary component carrier. The base station apparatus can also instruct the mobile station apparatus to activate / deactivate (activate / deactivate) the secondary component carrier allocated for power saving. The mobile station apparatus attempts to receive the downlink data channel by monitoring the downlink control channel only in the cell of the activated secondary component carrier, and uses the downlink control channel in the cell of the deactivated secondary component carrier. It is also possible to measure reception quality without monitoring.

  A non-configured component carrier is a component carrier that is neither PCC nor SCC and is not configured. The mobile station apparatus may perform measurement based on the measurement setting information even for a non-configured component carrier.

  The primary component carrier cell set in the mobile station apparatus is a primary serving cell, and the secondary component carrier cell is a secondary serving cell. That is, a mobile station apparatus that performs carrier aggregation is connected to a base station apparatus via a primary serving cell and one or more secondary serving cells.

  Also, the mobile station apparatus that performs carrier aggregation changes the cell state to (1) a set and activated state, (2) a set but inactive state, and (3) a non-set state. Categorize and manage. The primary serving cell can take only one state, and the inactive component carrier cell (peripheral cell) can take only three states. The secondary serving cell takes a state of 1 or 2. Further, by omitting the activation / deactivation state of the secondary serving cell, the mobile station apparatus may be configured to manage only two states, simply whether or not the secondary serving cell is set. .

[Example of communication network configuration of the present invention]
FIG. 15 is a diagram illustrating an example of a communication network configuration according to the embodiment of the present invention. When the mobile station apparatus 1 can be wirelessly connected to the base station apparatus 2 by simultaneously using cells of a plurality of frequency bands (component carriers) by carrier aggregation, a certain base station apparatus is used as a communication network configuration. 2 includes transmitters 11 to 13 (and receivers 21 to 23 (not shown)) for each of a plurality of frequency bands, and a configuration in which a single base station apparatus 2 controls cells in each frequency band simplifies the control. From the viewpoint of However, the base station apparatus 2 may be configured to transmit a plurality of frequency bands with a single transmission apparatus, for example, because the plurality of frequency bands are continuous frequency bands.

  The communicable range of each frequency band controlled by the transmission apparatus of the base station apparatus 2 is regarded as a cell and exists in the same spatial area. At this time, the areas (cells) covered by each frequency band may have different sizes and shapes. Further, a communication network configuration in which a frequency band that is carrier-aggregated by a plurality of base station apparatuses 2 is managed, and a higher-level control station apparatus manages the plurality of base station apparatuses 2 may be employed. The mobile station apparatus 1 can simultaneously measure different cells in the same frequency band, but is not connected at the same time.

  Note that the third generation base station apparatus 2 defined by 3GPP is referred to as a Node B (NodeB), and the base station apparatus 2 in EUTRA and Advanced EUTRA is referred to as an eNodeB (eNodeB). The base station device 2 manages a cell that is an area where the mobile station device 1 can communicate, and the cell is also referred to as a femto cell, a pico cell, or a nano cell depending on the size of the area that can communicate with the mobile station device 1. Further, when the mobile station device 1 can communicate with a certain base station device 2, the cell of the base station device 2 is a serving cell of the mobile station device 1, and the cells of the other base station devices 2 are neighboring cells. Called.

  In the description to be described later, each area covered by the frequency of the component carrier formed by the base station apparatus 2 will be referred to as a cell, but this may be different from the definition of the cell in the actually operated communication system. Note that there is sex. For example, in some communication systems, some of the component carriers used by carrier aggregation may be defined simply as additional radio resources rather than cells. By referring to the component carrier as a cell in the present invention, even if a case different from the definition of the cell in the actually operated communication system occurs, the gist of the present invention is not affected. The mobile station device 1 may be wirelessly connected to the base station device 2 via a relay station device (or repeater).

  Furthermore, in the description to be described later, when it is described as a component carrier, or a primary component carrier, a secondary component carrier, or a non-configured component carrier, it is noted that, unless otherwise specified, these all indicate component carriers in the downlink. . The component carrier measured by the mobile station apparatus 1 is a downlink component carrier, and the measurement setting information is set for the downlink component carrier.

  Considering the above matters, preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the present invention, when it is determined that a specific description of a known function or configuration related to the present invention obscures the gist of the present invention, a detailed description thereof is omitted.

<First Embodiment>
A first embodiment of the present invention will be described below. The present embodiment relates to a measurement setting management method in which the mobile station apparatus 1 during carrier aggregation reuses it by exchanging measurement setting information set after handover.

  FIG. 1 is a block diagram showing an example of a mobile station apparatus 1 according to the embodiment of the present invention. The mobile station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a measurement processing unit 104, a control unit 105, a random access processing unit 106, a coding unit 107, a modulation unit 108, a transmission unit 109, and an upper layer 110. Composed. Prior to reception, mobile station apparatus control information is input from the upper layer 110 to the control unit 105, and the mobile station apparatus control information related to reception is received as reception control information. The reception unit 101, demodulation unit 102, decoding unit 103, and measurement processing unit 104 Is entered appropriately. The reception control information includes information such as demodulation information, decoding information, reception frequency band information, reception timing for each channel, multiplexing method, and radio resource arrangement information as reception schedule information.

  The received signal is received by the receiving unit 101 via one or more antennas (not shown). The receiving unit 101 receives a signal in the frequency band notified by the reception control information. The receiving unit 101 includes a baseband processing unit for received signals. The received signal is input to demodulator 102. Demodulation section 102 demodulates the received signal and inputs the received signal to decoding section 103. The decoding unit 103 correctly decodes the received signal based on the reception control information. Decoding section 103 appropriately separates the received signal into downlink traffic data and downlink control data, and inputs the separated signals to higher layer 110, respectively. In addition, the decoding unit 103 inputs a decoded received signal related to measurement to the measurement processing unit 104. The measurement processing unit 104 performs measurement processing of the reception quality of the downlink reference signal for each cell and measurement processing of the reception error rate of the downlink control channel or the downlink data channel, and averages the measured reception quality for each sample. (Filtered) downlink measurement information is generated, and the downlink measurement information is output to the upper layer 110. In addition, the measurement processing unit 104 compares the obtained reception quality with a threshold (also referred to as Qout) used for detecting a downlink synchronization error, and outputs a downlink synchronization error to the upper layer 110 as necessary.

  Prior to transmission, mobile station apparatus control information is input from the upper layer 110 to the control section 105, and the mobile station apparatus control information related to transmission is transmitted as control information, a random access processing section 106, an encoding section 107, a modulation section 108, An appropriate input is made to the transmission unit 109. The transmission control information includes information such as encoding information, modulation information, transmission frequency band information, transmission timing for each channel, multiplexing method, and radio resource arrangement information as uplink scheduling information of the transmission signal. Random access processing unit 106 receives random access information necessary for transmission of a random access channel such as radio resource information necessary for random access and the maximum number of transmissions from upper layer 110.

  Further, when the random access processing unit 106 detects the random access problem by counting the number of transmissions of the random access channel, the random access processing unit 106 notifies the upper layer 110 of random access problem information indicating that the random access problem has occurred. Uplink traffic data and uplink control data from the upper layer 110 and random access data from the random access processing unit 106 are appropriately input to the encoding unit 107 according to the uplink channel. The encoding unit 107 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit 108. The modulation unit 108 modulates the input from the coding unit 107.

  The transmission unit 109 maps the output of the modulation unit 108 to the frequency domain, converts the frequency domain signal into a time domain signal, performs power amplification on a carrier wave of a predetermined frequency, and transmits the signal. An uplink data channel in which uplink control data is arranged typically constitutes a layer 3 message (radio resource control message; RRC message). The RRC of the mobile station device 1 exists as part of the upper layer 110. The random access processing unit 106 exists as part of a MAC (Medium Access Control) that manages the data link layer of the mobile station apparatus 1. A handover process and a measurement setting change process, which will be described later, are performed by the RRC of the mobile station apparatus 1. In FIG. 1, the other components of the mobile station apparatus 1 are omitted because they are not related to the present embodiment.

  FIG. 2 is a block diagram showing an example of the base station apparatus 2 according to the embodiment of the present invention. The base station apparatus 2 includes a reception unit 201, a demodulation unit 202, a decoding unit 203, a control unit 204, a coding unit 205, a modulation unit 206, a transmission unit 207, a network signal processing unit 208, a peripheral information management unit 209, and an upper layer 210. Consists of

  Upper layer 210 inputs downlink traffic data and downlink control data to encoding section 205. The encoding unit 205 encodes each input data and inputs the data to the modulation unit 206. Modulation section 206 modulates the encoded signal. Also, in the modulation unit 206, the downlink reference signal is multiplexed with the modulated signal and mapped to the frequency domain. The transmission unit 207 converts the frequency domain signal output from the modulation unit 206 into a time domain signal, places the converted signal on a carrier wave of a predetermined frequency, and performs power amplification and transmission. A downlink data channel in which downlink control data is arranged typically forms a layer 3 message (RRC message).

  The receiving unit 201 converts the received signal from the mobile station device 1 into a baseband digital signal. The digital signal is input to the demodulation unit 202 and demodulated. The signal demodulated by the demodulator 202 is subsequently input to the decoder 203 and decoded. The decoding unit 203 appropriately separates the received signal into uplink traffic data and uplink control data, and inputs each to the higher layer 210.

  Base station apparatus control information necessary for the control of each block is input from the upper layer 210 to the control unit 204, and the base station apparatus control information related to transmission is transmitted from the control unit 204 as transmission control information as a coding unit 205, modulation. Base station apparatus control information related to reception is appropriately input to each block of the reception unit 201, demodulation unit 202, and decoding unit 203 as reception control information in each block of the unit 206 and transmission unit 207.

  On the other hand, the network signal processing unit 208 transmits or receives control messages between the base station devices 2 (or between the control station devices (MME), gateway devices (Gateway), and relay station devices)). . Control messages are transmitted and received via a network line. The peripheral information management unit 209 manages network information for specifying the transmission destination or transmission source base station device 2 (or control station device, gateway device, relay station device). Network information can specify the address of each device on the network such as tracking area identifier (TAI), cell global identifier (CGI), cell identifier (PCI), network color code, Internet protocol address (IP address), etc. Consists of information.

  Control messages with the base station apparatus 2 (or relay station apparatus) are exchanged on a logical interface called an X2 interface, and control messages with the control station apparatus (or gateway apparatus) are sent on a logical interface called an S1 interface. Exchanged. The network line is typically a wired line, but may be a wireless line when communicating with a relay station device, for example.

  The peripheral information management unit 209 provides network information to the network signal processing unit 208 as necessary. The network signal processing unit 208 and the peripheral information management unit 209 are managed by an upper layer. The RRC of the base station device 2 exists as a part of the upper layer 210. In FIG. 2, the other components of the base station apparatus 2 are omitted because they are not related to the present embodiment.

  Subsequently, a measurement setting management method that the mobile station apparatus 1 of the present embodiment reuses by exchanging measurement setting information set after handover will be described. The measurement method described below is performed in the upper layer 110 (RRC) of the mobile station apparatus 1.

  The mobile station apparatus 1 and the base station apparatus 2 of the first embodiment perform a handover and measurement setting change process using the sequence diagram shown in FIG. However, it is not necessary to limit the frequency band operated by the base station apparatus 2 to two. Each control message illustrated in FIG. 12 may reuse an existing control message in EUTRA. For example, RRC Connection Reconfiguration message is used for measurement setup message and handover instruction message, Measurement Report message is used for measurement report message, and measurement setup completion message and handover completion message are reused only by adding necessary parameters to RRC Connection Reconfiguration Complete message. Is possible.

  FIG. 3 is a diagram showing a measurement setting management method in the case where measurement setting information before handover in the present embodiment is exchanged and reused after handover. FIG. 3 will be described in detail below.

  “No” (number) is a number irrelevant to the invention used to simplify the description. Hereinafter, description will be made using No as appropriate.

  “Source” indicates a type of a component carrier that is assigned before the handover by the mobile station apparatus 1 and that is changed after the handover before the handover. “PCC” indicates a primary component carrier, and “SCC” indicates a secondary component carrier. “NCC” indicates a non-configured component carrier.

  “Measurement Event” indicates the type of measurement event set in the mobile station apparatus 1 from the base station apparatus 2. “Serving cell only event” is a measurement event for the frequency band of the primary serving cell or the secondary serving cell, that is, PCC or SCC, and is not set in the NCC. “Primary Serving cell comparison event” is a measurement event for comparing the reception quality between the primary serving cell and other cells. “Secondary Serving cell comparison event” is a measurement event for comparing the reception quality between the secondary serving cell and the neighboring cells of the SCC, and is not set in the PCC and NCC. “Neighboring cell only event” is a measurement event for NCC, and is not set in PCC and SCC.

  These measurement events can be applied to EUTRA measurement events. For example, “Serving cell only event” corresponds to a measurement event (Event-A1 or Event-A2) when the quality of the serving cell is above / below a threshold value. “Primary Serving cell comparison event” corresponds to a measurement event (Event-A3 or Event-A3-PCC, Event-A5) when the quality of the neighboring cell exceeds the quality of the primary serving cell. “Secondary Serving cell comparison event” corresponds to a measurement event (Event-A3-SCC) when the quality of the neighboring cell exceeds the quality of the secondary serving cell. “Neighboring cell only event” corresponds to a measurement event (Event-A4) when the quality of a neighboring cell is above / below a threshold value.

  “Target” indicates the type after handover of the component carrier assigned by the mobile station apparatus 1 with “Source”.

  “Action” reuses the “Measurement Event” set in the component carrier indicated by “Source” using the method after the handover to the component carrier indicated by “Target”. Show about. “Swap” indicates that it can be reused by exchanging “Measurement Event”. “Delete” indicates that “Measurement Event” is deleted and not reused. “Remain” indicates that “Measurement Event” is reused without being exchanged.

  FIG. 4 is a diagram for explaining measurement setting information set in the mobile station apparatus 1 according to the first embodiment of the present invention.

  Cell A to cell F are cells operated at different frequencies F1 to F3. Cell A and cell B are operated at frequency F1, which is a primary component carrier PCC, and cell A is a primary serving cell. Cell C and cell D are operated at frequency F2 which is a secondary component carrier SCC, and cell C is a secondary serving cell. Cell E and cell F are neighboring cells operated at frequency F3, which is a non-configured component carrier NCC. That is, the mobile station apparatus 1 is being connected to the base station apparatus 2 via the cell A and the cell C by using carrier aggregation.

  Here, it is assumed that various measurement events linked to measurement IDs # 1 to 7 are set in the mobile station device 1 for each frequency (frequency band). The measurement ID # 1 is linked to “Serving cell only event”, and the measurement target frequency is the frequency F1. The measurement ID # 2 is linked to “Primary Serving cell comparison event”, and the measurement target frequency is the frequency F2. The measurement ID # 3 is linked to “Secondary Serving cell comparison event”, and the measurement target frequency is the frequency F2.

  The measurement ID # 4 is linked to “Neighboring cell only event”, and the measurement target frequency is the frequency F3. The measurement ID # 5 is linked to “Primary Serving cell comparison event”, and the measurement target frequency is the frequency F1. The measurement ID # 6 is linked to “Serving cell only event”, and the measurement target frequency is the frequency F2. The measurement ID # 7 is linked to “Primary Serving cell comparison event”, and the measurement target frequency is the frequency F3.

  At this time, a measurement setting management method when handover is performed using the PCA cell A of the frequency F1 as the source cell and the SCC cell C of the frequency F2 as the target cell will be described with reference to FIG.

  The mobile station apparatus 1 manages the measurement setting information according to FIG. In the case of FIG. 5, the measurement setting information is reused assuming that the target cell viewed from the cell A is the cell C and the target cell viewed from the cell C is the cell A. That is, in the mobile station apparatus 1, the measurement IDs (measurement ID # 1 (No. 1 in FIG. 3), measurement ID # 5 (No. 3 in FIG. 3)) linked to the frequency F1 in FIG. 4 are targets. Re-linked to frequency F2. Similarly, the measurement ID (measurement ID # 2 (No. 9 in FIG. 3), measurement ID # 3 (No. 7 in FIG. 3), measurement ID # 6 (No. 5 in FIG. 3) related to the measurement event linked to the frequency F2 in FIG. ) Is relinked with the target frequency F1. The mobile station apparatus 1 can use the same measurement setting management method even when handing over from the cell A to the cell D.

  The mobile station device 1 maintains the measurement IDs (measurement ID # 4, measurement ID # 7) related to the measurement event linked to the frequency F3 (NCC) that is not changed before and after the handover.

  A measurement setting management method when handover is performed using the PCA cell A of the frequency F1 as the source cell and the NCC cell E of the frequency F3 as the target cell will be described with reference to FIG.

  The mobile station apparatus 1 manages the measurement setting information according to FIG. In the case of FIG. 6, the measurement setting information is reused on the assumption that the target cell viewed from the cell A is the cell E and the target cell viewed from the cell E is the cell A. That is, in the mobile station apparatus 1, the measurement IDs related to the measurement event linked to the frequency F1 in FIG. 4 (measurement ID # 1 (No. 2 in FIG. 3), measurement ID # 5 (No. 4 in FIG. 3)) are targets. Re-linked to frequency F3. Similarly, the measurement IDs (measurement ID # 4 (No11 in FIG. 3) and measurement ID # 7 (No12 in FIG. 3)) related to the measurement event linked to the frequency F3 in FIG. 4 are re-linked with the target frequency F1. Is done. Note that the mobile station apparatus 1 can use the same measurement setting management method even when handing over from the cell A to the cell F.

  The mobile station device 1 maintains the measurement IDs (measurement ID # 2, measurement ID # 3, measurement ID # 6) related to the measurement event linked to the frequency F2 (SCC) that is not changed before and after the handover.

  A measurement setting management method when handover is performed using the cell C of the SCC of the frequency F2 as the source cell and the cell E of the NCC of the frequency F3 as the target cell will be described with reference to FIG.

  The mobile station apparatus 1 manages the measurement setting information according to FIG. In the case of FIG. 7, the measurement setting information is reused assuming that the target cell viewed from the cell C is the cell E and the target cell viewed from the cell E is the cell C. That is, the mobile station apparatus 1 measures the measurement ID (measurement ID # 2 (No. 10 in FIG. 3), measurement ID # 3 (No. 8 in FIG. 3), measurement ID # 6 (in FIG. 3) linked to the frequency F2 in FIG. 3, measurement ID # 3 and measurement ID # 6 are deleted without relinking, and measurement ID # 2 remains linked with frequency F2 without being relinked. Note that the mobile station apparatus 1 can use the same measurement setting management method even when handing over from the cell C to the cell F.

  Unlike FIGS. 5 to 6, the reason why the measurement ID is not exchanged in the case of FIG. 7 is that a plurality of secondary component carriers SCC may be set for the mobile station apparatus 1 and only a part thereof is changed. This is because the measurement ID cannot be exchanged unless the mobile station apparatus 1 knows the relationship between the source frequency and the target frequency. Therefore, it is easy in terms of management to leave the report setting ID of the measurement event for comparison with the primary component carrier PCC that is not changed, and to delete the report setting ID of other measurement events.

  The mobile station apparatus 1 maintains the measurement IDs (measurement ID # 1, measurement ID # 5) related to the measurement event linked to the frequency F1 (PCC) that is not changed before and after the handover.

  The measurement setting management method shown in FIGS. 5 to 6 determines whether (1) a measurement ID having the frequency band of the target cell as a measurement target frequency is set, and (2) if set, the source The measurement ID having the frequency band of the cell as the measurement target frequency is relinked to the frequency band of the target cell. (3) At the same time, the measurement ID having the frequency band of the target cell as the measurement target frequency is re-linked to the frequency band of the source cell. In other words, it can be said that the mobile station apparatus 1 makes a determination to link. If the measurement ID having the frequency band of the target cell as the measurement target frequency is not set, the measurement ID having the frequency band of the source cell as the measurement target frequency is deleted.

  In other words, in the measurement setting management method shown in FIG. 7, the mobile station apparatus 1 makes a determination that the measurement ID to be maintained and the measurement ID to be deleted are determined based on the measurement event linked to the measurement target frequency. I can do it. The mobile station apparatus 1 is connected to the base station apparatus 2 via a plurality of different types of cells by carrier aggregation only by making such a simple determination, and different measurement setting information is provided for each cell. Even if it is set, there is an advantage that the set measurement setting information can be reused as much as possible at the time of handover.

  Since the measurement setting management method described above is performed at the time of handover between the mobile station apparatus 1 and the base station apparatus 2, the base station apparatus 2 can accurately grasp the measurement setting information of the mobile station apparatus 1. Therefore, the base station apparatus 2 may update the measurement setting information of the mobile station apparatus 1 as necessary after the handover.

  As described above, in the first embodiment, the mobile station device 1 is set as the primary component carrier before the handover when the base station device 2 is instructed to perform the handover to move the component carrier in a different frequency band. Measurement setting management is performed so that the measured setting information can be reused for the primary component carrier after handover. Further, the mobile station apparatus 1 performs measurement setting management such that the measurement setting information set in the secondary component carrier before the handover is deleted or maintained according to the target frequency band. The base station apparatus 2 performs measurement setting management similar to that of the mobile station apparatus 1 to correctly grasp the measurement setting information of the mobile station apparatus 1. If necessary, the measurement setting information is updated for the mobile station apparatus 1.

  As described above, in the mobile station apparatus 1, when a plurality of component carriers are set by carrier aggregation and measurement setting information is set for each component carrier, the configuration of the component carrier is set by handover. Even if it is changed, the measurement setting information can be reused as much as possible by making simple judgments. Therefore, the mobile station apparatus 1 does not need to receive and reset the measurement setting information again after the handover, and the processing is simplified. In addition, since the base station apparatus 2 does not need to transmit the measurement setting information to the mobile station apparatus again after the handover, the consumption of radio resources is reduced.

<Second Embodiment>
A second embodiment of the present invention will be described below. In the first embodiment, when the SCC cell (secondary serving cell) is changed, it is necessary to make a determination to delete or maintain the measurement setting information set in the SCC. In view of this, the second embodiment of the present invention provides a measurement setting management method capable of reusing measurement setting information during handover by using an identifier indicating that measurement setting information can be exchanged during handover. provide.

  When the base station apparatus 2 of this embodiment instructs the mobile station apparatus 1 to perform handover, measurement setting information to be reused is set for a frequency band in which measurement setting information can be reused after handover. An identifier indicating the assigned frequency band is notified. As the identifier, for example, the measurement ID, the measurement target frequency ID, the cell ID, and the CC-ID (Component Carrier-ID, component carrier identifier) allocated to the component carrier that are notified to the mobile station apparatus 1 before the handover are used. I can do it.

  FIG. 8 is a diagram showing a measurement setting management method when the measurement setting information before handover in the present embodiment is exchanged and reused after handover. FIG. 8 is a diagram in which only portions different from FIG. 3 described above are extracted, and it is noted that the measurement setting management method in the case of Nos. 1 to 4 and Nos. 11 to 12 follows FIG.

  A method of a measurement setting management method when handover is performed using the cell C of the SCC of frequency F2 as the source cell and the cell E of the NCC of frequency F3 as the target cell will be described with reference to FIG. At this time, when the base station apparatus 2 instructs the mobile station apparatus 1 to perform a handover to the cell E of the NCC of the frequency F3, any one of the identifiers used in the cell C of the SCC of the frequency F2 Is included in the handover instruction message and notified. Note that the mobile station apparatus 1 performs the same measurement setting management method as in FIG. 3 when the base station apparatus 2 instructs handover without including an identifier. That is, the mobile station apparatus 1 that has received the handover instruction message including the identifier indicating that the measurement setting information can be exchanged performs “swap” on the measurement setting information in the relationship of No8 and No10, When the identifier indicating that the measurement setting information can be exchanged is not received, “delete” and “remain” are performed for the measurement setting information in the relationship of No. 8 and No. 10, respectively.

  Further, when the base station apparatus 2 instructs handover without including the identifier, the mobile station apparatus 1 performs the same measurement setting management method as in FIG. 8, and the base station apparatus 2 performs handover with the identifier. May be performed, the same measurement setting management method as in FIG. 3 may be performed.

  The mobile station apparatus 1 manages the measurement setting information according to FIG. In the case of FIG. 9, the measurement setting information is reused on the assumption that the target cell viewed from the cell C is the cell E and the target cell viewed from the cell E is the cell C. That is, the mobile station apparatus 1 measures the measurement ID (measurement ID # 2 (No. 10 in FIG. 8), measurement ID # 3 (No. 8 in FIG. 8), measurement ID # 6 (FIG. 8) linked to the frequency F2 in FIG. 8, the measurement ID # 6 is deleted without relinking, and the measurement ID # 2 and the measurement ID # 3 are relinked to the target frequency F3. 4, the measurement IDs (measurement ID # 4 (No11 in FIG. 3) and measurement ID # 7 (No12 in FIG. 3)) related to the measurement event linked to the frequency F3 in FIG. 4 are relinked with the target frequency F2. Note that the mobile station apparatus 1 can use the same measurement setting management method even when handing over from the cell C to the cell F.

  The mobile station apparatus 1 maintains the measurement IDs (measurement ID # 1, measurement ID # 5) related to the measurement event linked to the frequency F1 (PCC) that is not changed before and after the handover.

  Note that the identifier included in the handover instruction message may be configured such that “Action” can be changed for each changeable item (that is, No. 8 and No. 10) shown in FIG. The “Action” may be changed collectively for the changeable items.

  The measurement setting management method shown in FIG. 9 determines (1) whether or not an identifier indicating the frequency band of the source cell is set in the handover instruction message, and (2) if it is set, Relink the measurement ID with the frequency band as the measurement target frequency to the frequency band of the target cell, and (3) simultaneously relink the measurement ID with the frequency band of the target cell as the measurement target frequency to the frequency band of the source cell. In other words, it can be said that the mobile station apparatus 1 makes the determination. If the measurement ID having the frequency band of the target cell as the measurement target frequency is not set, the measurement ID having the frequency band of the source cell as the measurement target frequency is deleted.

  In addition to the determination of the first embodiment, the mobile station apparatus 1 is connected to the base station apparatus 2 via a plurality of different types of cells depending on carrier aggregation only by adding an identifier indicating a link destination to the handover instruction message. Even when different measurement setting information is set for each cell, the advantage is that measurement setting information that has been set can be reused as much as possible at the time of handover. is there.

  Since the measurement setting management method described above is performed at the time of handover between the mobile station apparatus 1 and the base station apparatus 2, the base station apparatus 2 can accurately grasp the measurement setting information of the mobile station apparatus 1. Therefore, the base station apparatus 2 may update the measurement setting information of the mobile station apparatus 1 as necessary after the handover.

  As described above, in the second embodiment, the mobile station apparatus 1 uses the measurement setting information set in the secondary component carrier before the handover to the presence / absence of the identifier indicating the frequency band of the source cell included in the handover instruction message. Accordingly, measurement setting management that can be reused for the secondary component carrier after handover, or measurement setting management that is deleted or maintained is performed. The base station apparatus 2 transmits to the mobile station apparatus 1 an identifier used for determining whether to reuse the measurement setting information set in the secondary component carrier in the handover instruction message. Further, the base station apparatus 2 correctly grasps the measurement setting information of the mobile station apparatus 1 by performing the same measurement setting management as that of the mobile station apparatus 1. If necessary, the measurement setting information is updated for the mobile station apparatus 1.

  As described above, in the mobile station apparatus 1, when a plurality of component carriers are set by carrier aggregation and measurement setting information is set for each component carrier, the configuration of the component carrier is set by handover. Even if it is changed, the measurement setting information can be reused as much as possible only by confirming the identifier indicating the frequency band of the source cell. Therefore, the mobile station apparatus 1 does not need to receive and reset the measurement setting information again after the handover, and the processing is simplified. In addition, since the base station apparatus 2 does not need to transmit the measurement setting information to the mobile station apparatus again after the handover, the consumption of radio resources is reduced.

<Third Embodiment>
A third embodiment of the present invention will be described below. In the first embodiment, when the source cell type is NCC, it is necessary to determine whether or not the measurement setting information of the target cell can be reused. In this embodiment, by using an identifier indicating that the measurement setting information of the target cell cannot be exchanged with the frequency band of the source cell at the time of handover, the measurement setting information can be reused at the time of handover. Provide a configuration management method.

  When the base station apparatus 2 of the present embodiment instructs the mobile station apparatus 1 to perform handover, measurement setting information that is not reused is set for a frequency band in which measurement setting information can be reused after handover. An identifier indicating the assigned frequency band is notified. As the identifier, for example, the measurement ID, the measurement target frequency ID, the cell ID, and the CC-ID (Component Carrier-ID, component carrier identifier) allocated to the component carrier that are notified to the mobile station apparatus 1 before the handover are used. I can do it.

  FIG. 10 is a diagram illustrating a measurement setting management method in the case where measurement setting information before handover in the present embodiment is exchanged and reused after handover. FIG. 10 is a diagram in which only the portions different from FIG. 3 described above are extracted, and it is noted that the measurement setting management method in the case of No. 1 to 4 and No. 11 to 12 follows FIG.

  Another method of the measurement setting management method when handover is performed using the PCA cell A of frequency F1 as the source cell and the SCC cell C of frequency F2 as the target cell will be described with reference to FIG. At this time, when the base station apparatus 2 instructs the mobile station apparatus 1 to perform handover to the cell C of the SCC of the frequency F2, any of the identifiers used in the cell A of the PCC of the frequency F1 Is included in the handover instruction message and notified. Note that the mobile station apparatus 1 performs the same measurement setting management method as in FIG. 3 when the base station apparatus 2 instructs handover without including the identifier. That is, the mobile station apparatus 1 that has received the handover instruction message including the identifier indicating that measurement setting information cannot be exchanged is “delete” for the measurement setting information in the relationship of No5, No7, and No9. If no identifier indicating that the measurement setting information cannot be exchanged is received, “swap” is performed for the measurement setting information in the relationship of No5, No7, and No9.

  Further, when the base station apparatus 2 instructs handover without including the identifier, the mobile station apparatus 1 performs the same measurement setting management method as in FIG. 10, and the base station apparatus 2 performs handover including the identifier. May be performed, the same measurement setting management method as in FIG. 3 may be performed.

  The mobile station apparatus 1 manages the measurement setting information according to FIG. In the case of FIG. 11, the measurement setting information is reused assuming that the target cell viewed from the cell A is the cell C and the target cell viewed from the cell C is the cell A. That is, in the mobile station apparatus 1, the measurement IDs related to the measurement event linked to the frequency F1 in FIG. 4 (measurement ID # 1 (No. 2 in FIG. 3), measurement ID # 5 (No. 4 in FIG. 3)) are targets. Re-linked to frequency F2. On the other hand, the measurement IDs related to the measurement event linked to the frequency F2 in FIG. 4 (measurement ID # 2 (No. 10 in FIG. 8), measurement ID # 3 (No. 8 in FIG. 8), measurement ID # 6 (No. 6 in FIG. 8)). Is deleted. Note that the mobile station apparatus 1 can use the same measurement setting management method even when handing over from the cell C to the cell F.

  The mobile station device 1 maintains the measurement IDs (measurement ID # 4, measurement ID # 7) related to the measurement event linked to the frequency F3 (NCC) that is not changed before and after the handover.

  The identifier included in the handover instruction message is configured so that the “action” can be changed for each changeable item shown in FIG. 11 (that is, No5, No7, No9) for the mobile station apparatus 1. Alternatively, the “Action” may be changed collectively for all changeable items.

  In the measurement setting management method shown in FIG. 11, (1) it is determined whether or not an identifier indicating the frequency band of the source cell is set. (2) If it is set, the frequency band of the source cell is measured. In other words, the mobile station apparatus 1 makes a determination to relink the measurement ID to be the frequency to the frequency band of the target cell and (3) to delete the measurement ID having the frequency band of the target cell as the measurement target frequency at the same time. I can do it. If the measurement ID having the frequency band of the target cell as the measurement target frequency is not set, the measurement ID having the frequency band of the source cell as the measurement target frequency is deleted.

  In addition to the determination of the first embodiment, the mobile station apparatus 1 is connected to the base station apparatus 2 via a plurality of different types of cells depending on carrier aggregation only by adding an identifier indicating a link destination to the handover instruction message. Even if different measurement setting information is set for each cell, the measurement setting information is deleted or exchanged based on an instruction from the base station apparatus 2 regardless of the type of the source cell after the handover. Therefore, there is an advantage that management of measurement setting information becomes management.

  Since the measurement setting management method described above is performed at the time of handover between the mobile station apparatus 1 and the base station apparatus 2, the base station apparatus 2 can accurately grasp the measurement setting information of the mobile station apparatus 1. Therefore, the base station apparatus 2 may update the measurement setting information of the mobile station apparatus 1 as necessary after the handover.

  As described above, in the third embodiment, the mobile station apparatus 1 uses the measurement setting information set in the component carrier of the target cell before handover as an identifier indicating the frequency band of the source cell included in the handover instruction message. Depending on the presence or absence, measurement setting management is performed so that the component carrier of the source cell after handover can be reused, or measurement setting management such as deletion is performed. The base station apparatus 2 transmits to the mobile station apparatus 1 an identifier used for determining whether to reuse the measurement setting information set in the component carrier of the target cell, in the handover instruction message. Further, the base station apparatus 2 correctly grasps the measurement setting information of the mobile station apparatus 1 by performing the same measurement setting management as that of the mobile station apparatus 1. If necessary, the measurement setting information is updated for the mobile station apparatus 1.

  As described above, in the mobile station apparatus 1, when a plurality of component carriers are set by carrier aggregation and measurement setting information is set for each component carrier, the configuration of the component carrier is set by handover. Even if it is changed, it is possible to determine whether or not the measurement setting information can be reused simply by confirming the identifier indicating the frequency band of the source cell, so that the processing is simplified.

  The identifier indicating that the measurement setting information shown in the second embodiment can be exchanged and the identifier showing that the measurement setting information shown in the third embodiment cannot be exchanged are It can also be included in the instruction message and sent.

  The embodiment described above is merely an example, and can be realized using various modifications and replacement examples.

  Further, for convenience of explanation, the mobile station device 1 and the base station device 2 of each embodiment have been described using functional block diagrams, but the functions of the respective units of the mobile station device 1 and the base station device 2 or the functions of these functions A program for realizing a part is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed to control the mobile station apparatus and the base station apparatus. May be. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a semiconductor medium (eg, RAM, nonvolatile memory card, etc.), an optical recording medium (eg, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (eg, , A magnetic tape, a flexible disk, etc.) and a storage device such as a disk unit built in a computer system. Furthermore, the “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. .

  In addition, each functional block or various features of the mobile station device 1 and the base station device 2 used in the above embodiments may be configured in a circuit including an LSI that is typically an IC (integrated circuit). . In that case, the integration density of the LSI may be realized at any density. Each functional block and various features may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  As mentioned above, although embodiment of this invention has been explained in full detail based on the specific example, it is clear that the meaning of this invention and a claim are not limited to these specific examples. In other words, the description in the present specification is for illustrative purposes and does not limit the present invention.

DESCRIPTION OF SYMBOLS 1 ... Mobile station apparatus 2 ... Base station apparatus 11-13 ... Transmission apparatus 21-23 ... Reception apparatus 101, 201 ... Reception part 102, 202 ... Demodulation part 103, 203 ... Decoding part 104 ... Measurement processing part 105, 204 ... Control Unit 106 ... Random access processing unit 107, 205 ... Encoding unit 108, 206 ... Modulation unit 109, 207 ... Transmission unit 110, 210 ... Upper layer 208 ... Network signal processing unit 209 ... Peripheral information management unit

Claims (15)

The base station apparatus sets, for each frequency band, measurement setting information necessary for measuring a cell in a plurality of frequency bands for the mobile station apparatus, and the mobile station apparatus uses the cells in the plurality of frequency bands at the same time. A communication system for communicating with a station device,
The cell types are classified into a first cell that is always activated, a second cell that can be deactivated, and a third cell other than that,
The base station device
A handover instruction message for deciding to execute handover for designating change of the frequency band of the first cell or the frequency band of the second cell to the mobile station apparatus and instructing execution of the handover Transmitting to the mobile station device,
The mobile station device
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is received and the frequency of the first cell before the handover is received. A communication system using a measurement setting management method for determining whether to use a band or a frequency band of the second cell. The mobile station device
When measurement setting information is set in a frequency band used as the first cell or the second cell after handover,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. Used for bandwidth,
If measurement setting information is not set in the frequency band used as the first cell or the second cell after handover,
The communication according to claim 1, wherein a measurement setting management method for deleting measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover is used. system. The mobile station device
When an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is set in the handover instruction message,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. Used for bandwidth,
When an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is not set in the handover instruction message,
The communication according to claim 1, wherein a measurement setting management method for deleting measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover is used. system. The mobile station device
When an identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is set in the handover instruction message,
Delete the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before the handover;
When an identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is not set in the handover instruction message,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. 2. The communication system according to claim 1, wherein a measurement setting management method used for a band is used.   The communication system according to claim 3 or 4, wherein the identifier is a measurement ID, a measurement target frequency ID, a cell ID, or a component carrier identifier.   The communication system according to claim 5, wherein a plurality of identifiers are set for each frequency band. The base station apparatus sets, for each frequency band, measurement setting information necessary for measuring a cell in a plurality of frequency bands for the mobile station apparatus, and the mobile station apparatus uses the cells in the plurality of frequency bands at the same time. A mobile station apparatus in a communication system that communicates by connecting to a station apparatus,
The cell types are classified into a first cell that is always activated, a second cell that can be deactivated, and a third cell other than that,
The base station apparatus decides execution of a handover specifying a change in the frequency band of the first cell or the frequency band of the second cell, and receives a handover instruction message instructing the execution of the handover The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is changed to the frequency band of the first cell or the second cell before the handover. A mobile station apparatus characterized by using a measurement setting management method for determining whether to use a frequency band. The mobile station device
When measurement setting information is set in a frequency band used as the first cell or the second cell after handover,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. Used for bandwidth,
If measurement setting information is not set in the frequency band used as the first cell or the second cell after handover,
The movement according to claim 7, wherein a measurement setting management method is used to delete measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover. Station equipment. The mobile station device
When an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is set in the handover instruction message,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. Used for bandwidth,
When an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is not set in the handover instruction message,
The movement according to claim 7, wherein a measurement setting management method is used to delete measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover. Station equipment. The mobile station device
When an identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is set in the handover instruction message,
Delete the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before the handover;
When an identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is not set in the handover instruction message,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. The mobile station apparatus according to claim 7, wherein a measurement setting management method used for a band is used. The base station apparatus sets, for each frequency band, measurement setting information necessary for measuring a cell in a plurality of frequency bands for the mobile station apparatus, and the mobile station apparatus uses the cells in the plurality of frequency bands at the same time. A base station apparatus in a communication system that performs communication by connecting to a station apparatus,
The cell types are classified into a first cell that is always activated, a second cell that can be deactivated, and a third cell other than that,
A handover instruction message for deciding to execute handover for designating change of the frequency band of the first cell or the frequency band of the second cell to the mobile station apparatus and instructing execution of the handover The measurement setting information transmitted to the mobile station apparatus and set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell before the handover. Alternatively, a base station apparatus using a measurement setting management method that causes the mobile station apparatus to determine whether to use the frequency band of the second cell. The base station apparatus sets, for each frequency band, measurement setting information necessary for measuring a cell in a plurality of frequency bands for the mobile station apparatus, and the mobile station apparatus uses the cells in the plurality of frequency bands at the same time. A measurement setting management method for a mobile station apparatus in a communication system that communicates by connecting with a station apparatus,
The cell types are classified into a first cell that is always activated, a second cell that can be deactivated, and a third cell other than that,
The mobile station device
A step of determining execution of a handover specifying a change in the frequency band of the first cell or the frequency band of the second cell from the base station apparatus; and a handover instruction message instructing the execution of the handover Receiving the measurement setting information set in the frequency band used as the first cell or the second cell after the handover, the frequency band of the first cell before the handover or the And a step of determining whether or not to use the frequency band of the two cells. The measurement management method includes:
When measurement setting information is set in a frequency band used as the first cell or the second cell after handover,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. Steps to use for bandwidth,
If measurement setting information is not set in the frequency band used as the first cell or the second cell after handover,
The measurement setting according to claim 12, further comprising: deleting measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover. Management method. The measurement management method includes:
When an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is set in the handover instruction message,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. Steps to use for bandwidth,
When an identifier indicating that the measurement setting information can be exchanged for the frequency band of the target cell is not set in the handover instruction message,
The measurement setting according to claim 12, further comprising: deleting measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover. Management method. The measurement management method includes:
When an identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is set in the handover instruction message,
Deleting the measurement setting information set in the frequency band of the first cell or the frequency band of the second cell before handover;
When an identifier indicating that the measurement setting information set in the frequency band of the target cell cannot be exchanged for the frequency band of the source cell is not set in the handover instruction message,
The measurement setting information set in the frequency band used as the first cell or the second cell after the handover is the frequency band of the first cell or the frequency of the second cell before the handover. The measurement setting management method according to claim 12, further comprising a step of using the bandwidth.