JP2012209649A - Communication system, mobile station device, base station device, radio resource allocation method and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system, a base station device, a mobile station device, a radio resource allocation method and an integrated circuit which enable efficient allocation of radio resource when the mobile station device aggregates carriers without backward compatibility and communicates with the base station device.SOLUTION: A communication system is provided in which a mobile station device and a base station device aggregate frequency bands of cells and extension frequency bands for extension of the frequency bands of cells and communicate with each other. The base station device changes radio resource allocation information showing allocation of radio resource used for communication with the mobile station device at the timing when the extension frequency band becomes effective for transmission to the mobile station device. The mobile station device receives the radio resource allocation information by determining that the allocation of the radio resource shown by the radio resource allocation information is changed at the timing when the extention frequency band becomes effective.

Description

  The present invention relates to a communication system, a base station apparatus, a mobile station apparatus, a radio resource allocation method, and an integrated circuit that efficiently allocate radio resources.

  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 The standardization of Universal Terrestrial Radio Access (hereinafter referred to as EUTRA) was carried out.

  In 3GPP, advanced EUTRA that achieves higher-speed data transmission and has upward compatibility with EUTRA is being discussed. As a technique in Advanced EUTRA, carrier aggregation has been proposed. Carrier aggregation is a technique for improving a transmission rate by aggregating and using frequency bands (also referred to as component carriers) of a plurality of different frequencies (carriers). Further, as an example of the case of using carrier aggregation, a method of aggregating carriers that are not backward compatible (carrier segment or extension carrier) has been discussed (Non-patent Document 1, Non-patent document 2).

  A carrier segment is an additional carrier (frequency band, resource block) used to expand the system bandwidth (total number of consecutive resource blocks) of a cell in use. By using the carrier segment, it is possible to expand only the bandwidth without changing the center frequency of the frequency band used by the mobile station apparatus. For example, for a mobile station apparatus using a frequency bandwidth of 10 MHz, by adding a 5 MHz carrier segment to both frequency ends, the mobile station apparatus can communicate with a frequency bandwidth of 20 MHz (5 MHz + 10 MHz + 5 MHz). It becomes possible. The carrier segment is also referred to as a segment carrier, a segment cell, a cell segment, or a partial frequency.

  An extension carrier is an additional carrier (frequency band, resource block) different from the system bandwidth of a cell in use. By using the extension carrier, the bandwidth can be expanded without affecting the frequency band used by the mobile station apparatus. For example, by adding a 5 MHz extension carrier to a mobile station apparatus using a frequency bandwidth of 10 MHz, the mobile station apparatus can perform communication with a frequency bandwidth of 15 MHz (10 MHz + 5 MHz). The extension carrier is also referred to as an extension cell.

  The major difference between a non-backward compatible carrier (hereinafter referred to as an incompatible carrier) such as a carrier segment or an extension carrier and a normal carrier (component carrier) is an incompatible carrier. Then, the base station apparatus can be configured not to transmit the synchronization signal and the physical broadcast information channel. Similarly, in an incompatible carrier, the base station apparatus can be configured not to transmit a physical downlink control channel or a downlink reference signal (details of the physical channel will be described later). Furthermore, in an incompatible carrier, the base station apparatus can be configured not to transmit a paging message.

  Patent Document 1 discloses a method of using, as a parameter, a bandwidth expanded by applying an incompatible carrier as a radio resource allocation method using a physical downlink control channel as control when an incompatible carrier is applied. Is disclosed.

WO2010 / 049754 A1, NOKIA CORPORATION, 2008.10.28

R1-100803, Alcatel-Lucent, 3GPP TSG-RAN WG1 # 59bis, 18-22 January 2010, Valencia, Spain R1-100809, Huawei, 3GPP TSG-RAN WG1 # 59bis, 18-22 January 2010, Valencia, Spain

  However, when the incompatible carrier shown in Non-Patent Document 1 or Non-Patent Document 2 is used in EUTRA, there is no indication as to how to appropriately set the incompatible carrier for the mobile station apparatus. .

  For example, if the mobile station device set with the incompatible carrier has not decided at which timing the radio resource allocation of the incompatible carrier becomes effective, the communication state mismatch between the mobile station device and the base station device Therefore, there is a section in which communication cannot be performed correctly, resulting in a problem that wireless resource utilization efficiency deteriorates.

  Patent Document 1 discloses a method of performing radio resource allocation by replacing a parameter indicating a bandwidth expanded by applying an incompatible carrier with a parameter indicating a conventional bandwidth. However, the method of Patent Document 1 does not indicate the timing at which radio resource allocation using a parameter indicating an extended bandwidth is performed, and the communication state mismatch between the mobile station apparatus and the base station apparatus Therefore, it is impossible to solve the problem that a section in which communication cannot be performed correctly occurs.

  In view of the above problems, an object of the present invention is to provide a communication system and a base station apparatus that efficiently allocate radio resources when the mobile station apparatus aggregates carriers that are not backward compatible and communicates with the base station apparatus. An object of the present invention is to provide a mobile station apparatus, a radio resource allocation method, and an integrated circuit.

  In order to achieve the above object, the present invention takes the following measures. That is, the base station apparatus and the mobile station apparatus use the normal bandwidth or the extended frequency according to the set timing at which the carrier segment becomes available, based on the system bandwidth used in the radio resource allocation information included in the physical downlink control channel. It is characterized by operating by changing the interpretation as appropriate so as to use either one of the bandwidths.

  (1) That is, the communication system of the present application is a communication system in which a mobile station apparatus and a base station apparatus perform communication by aggregating a cell frequency band and an extended frequency band that extends the cell frequency band. The base station apparatus changes radio resource allocation information indicating allocation of radio resources used for communication with the mobile station apparatus at a timing when the extended frequency band becomes valid, and transmits the radio resource allocation information to the mobile station apparatus. The station apparatus receives the radio resource allocation information by determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid.

  (2) Further, in the communication system of the present application, when the radio resource allocation information is transmitted in a cell different from the cell, the mobile resource device changes the radio resource allocation information transmitted in the different cell. It is determined that the radio resource allocation information is received, and the radio resource allocation information is received.

  (3) Further, in the communication system of the present application, the radio resource allocation information is changed based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band. .

  (4) Also, in the communication system of the present application, the mobile station apparatus decodes the radio resource allocation information based on the extended frequency band after a predetermined time has elapsed after activating the extended frequency band. It is characterized by performing.

  (5) Further, in the communication system of the present application, the base station device encodes the radio resource allocation information based on the extended frequency band after a predetermined time has elapsed after activating the extended frequency band. It is characterized by performing.

  (6) Further, the base station apparatus of the present application is a communication system base in which a mobile station apparatus and a base station apparatus perform communication by aggregating a cell frequency band and an extended frequency band that extends the cell frequency band. A station apparatus, wherein radio resource allocation information indicating allocation of radio resources used for communication with the mobile station apparatus is changed and transmitted to the mobile station apparatus at a timing when the extended frequency band becomes valid. To do.

  (7) When the base station apparatus of the present application transmits the radio resource allocation information in a cell different from the cell, the base station apparatus changes the radio resource allocation information transmitted in the different cell to change the radio resource allocation information. Is transmitted.

  (8) In addition, in the base station apparatus of the present application, the radio resource allocation information is changed based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band. .

  (9) In addition, the base station apparatus of the present application performs encoding processing of the radio resource allocation information based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band. And

  (10) In the mobile station device of the present application, the mobile station device and the base station device move a communication system in which communication is performed by aggregating a cell frequency band and an extended frequency band that extends the cell frequency band. A station apparatus, wherein the radio resource allocation information is received by determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid.

  (11) In addition, when the radio resource allocation information is transmitted in a cell different from the cell, the mobile station apparatus of the present application determines that the radio resource allocation information transmitted in the different cell is changed. The radio resource allocation information is received.

  (12) Further, in the mobile station apparatus of the present application, it is determined that the radio resource allocation information has been changed based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band. Features.

  (13) Further, the mobile station apparatus of the present application performs decoding processing of the radio resource allocation information based on the extended frequency band after a predetermined time has elapsed since the extended frequency band is activated. And

  (14) The radio resource allocation method of the present application is a communication system in which a mobile station apparatus and a base station apparatus perform communication by aggregating a cell frequency band and an extended frequency band that extends the frequency band of the cell. In the radio resource allocation method, the base station apparatus changes radio resource allocation information indicating allocation of radio resources used for communication with the mobile station apparatus at a timing when the extended frequency band becomes effective, and the mobile station A step of transmitting to the apparatus, and the mobile station apparatus determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid and receiving the radio resource allocation information It is characterized by including.

  (15) Further, in the integrated circuit of the mobile station apparatus of the present application, the mobile station apparatus and the base station apparatus perform communication by aggregating a cell frequency band and an extended frequency band that extends the cell frequency band. An integrated circuit of a mobile station apparatus in the system, wherein the radio resource allocation information is received by determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid. Features.

  In the present specification, the present invention is disclosed in terms of improvement of a communication system, a base station apparatus, a mobile station apparatus, and a radio resource management method when the mobile station apparatus and the base station apparatus are connected using a plurality of frequencies. However, the communication method to which the present invention is applicable is not limited to a communication method that is upward compatible with EUTRA, such as EUTRA or Advanced EUTRA. For example, the present invention can be applied to UMTS (Universal Mobile Telecommunications System).

  As described above, according to the present invention, when the mobile station device aggregates carriers that are not backward compatible and communicates with the base station device, the communication system, the base station device, A mobile station apparatus, a radio resource allocation method, and an integrated circuit can be provided.

It is a block diagram which shows schematic structure of the mobile station apparatus in this invention. It is a block diagram which shows schematic structure of the base station apparatus in this invention. It is a sequence chart for demonstrating the procedure to add the setting of an incompatible carrier in this invention. It is a sequence chart for demonstrating the procedure which activates the incompatible carrier in this invention. It is a sequence chart for demonstrating the procedure which deactivates an incompatible carrier in this invention. It is a sequence chart figure for demonstrating the procedure which deletes the setting of an incompatible carrier in this invention. It is a figure for demonstrating the relationship between the setting parameter of a carrier segment and a serving cell in 1st Embodiment. It is a figure for demonstrating the switching timing of the radio | wireless resource allocation method using the carrier segment in 1st Embodiment. It is the figure which showed an example of the communication network structure which concerns on embodiment of this invention. It is the figure which showed an example of the setting of the component carrier with respect to the mobile station apparatus which concerns on embodiment of this invention. It is the figure which showed an example of the setting of the carrier segment with respect to the mobile station apparatus which concerns on embodiment of this invention.

  Before describing the embodiments of the present invention, carrier aggregation, physical channels, radio resource allocation methods, communication network configurations, and the like according to the present invention will be briefly described.

[Career aggregation]
Carrier aggregation is a technology that aggregates (aggregates) a plurality of different frequencies (component carriers or frequency bands) and treats them as one frequency (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 these components as one frequency bandwidth of 100 MHz. The component carriers to be aggregated may be continuous frequencies, or may be frequencies at which all or part of them are discontinuous. For example, when the usable frequency is in the 800 MHz band, 2.4 GHz band, and 3.4 GHz band, one component carrier is in the 800 MHz band, another component carrier is in the 2 GHz band, and another component carrier is in the 3.4 GHz band. It may be transmitted by.

  It is also possible to aggregate continuous or discontinuous component carriers in the same frequency band, for example, the 2.4 GHz band. The frequency bandwidth of each component carrier may be a frequency bandwidth narrower than 20 MHz, and the frequency bandwidth may be different from each other. The base station apparatus determines the number of uplink or downlink component carriers to be allocated to the mobile station apparatus based on various factors such as the amount of retained data buffer, the reception quality of the mobile station apparatus, the load in the cell, and QoS. Can be increased or decreased. It is desirable that the number of uplink component carriers assigned by the base station apparatus is the same as or less than the number of downlink component carriers.

  Further, the base station apparatus configures one cell by combining one downlink component carrier and one uplink component carrier. Note that the base station apparatus can also configure one cell using only one downlink component carrier (that is, no uplink component carrier is assigned).

  In addition, the mobile station apparatus can aggregate and use incompatible carriers such as a carrier segment or an extension carrier for one component carrier by carrier aggregation. The incompatible carrier and the component carrier do not need to be continuous frequencies, and the component carrier and the incompatible carrier having a different frequency can be aggregated. The frequency bandwidth of the incompatible carrier is preferably the same as the frequency bandwidth that can be set for the component carrier, but may be any frequency band.

[Physical channel]
The main physical channels (or physical signals) used in EUTRA and Advanced EUTRA will be described. A channel means a medium used for signal transmission, and a physical channel means a physical medium used for signal transmission. 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.

  In EUTRA and Advanced EUTRA, scheduling of physical channels is managed using radio frames. One radio frame is 10 ms, and one radio frame is composed of 10 subframes. Further, one subframe is composed of two slots (that is, one slot is 0.5 ms). Also, resource blocks are used as a minimum scheduling unit in which physical channels are allocated. A resource block is defined by a constant frequency region composed of a set of a plurality of subcarriers (for example, 12 subcarriers) and a region composed of a constant transmission time interval (1 slot) on the frequency axis. One subcarrier is 15 kHz, and one resource block is 180 kHz. The frequency bandwidth can also be expressed using continuous resource blocks. For example, 20 MHz is 110 resource blocks.

  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. By the combination, 504 kinds of cell identifiers (Cell ID: PCI) for identifying base station apparatuses 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. Broadcast information that is not notified on the physical broadcast information channel is transmitted as a layer 3 message (system information) on the physical downlink shared channel after the radio resource is notified on the physical downlink control channel. As broadcast information, a cell global identifier (CGI) indicating a cell-specific identifier, a tracking area identifier (TAI) for managing a standby area by paging, random access control information, and the like are 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 demodulating the physical downlink control channel or the physical downlink shared 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.

  The uplink reference signal (uplink reference signal: uplink pilot signal, also referred to as uplink pilot channel) is transmitted from the base station apparatus to the physical uplink control channel PUCCH and / or the physical uplink shared channel PUSCH. Demodulation reference signal (DRS) used for demodulation and a sounding reference signal (SRS) used mainly by the base station apparatus to estimate the uplink channel state It is.

  A physical downlink control channel (PDCCH; Physical Downlink Control Channel) is transmitted in some OFDM symbols from the beginning of each subframe, and radio resource allocation information according to the scheduling of the base station device to the mobile station device, It is used for the purpose of instructing the adjustment amount of increase / decrease of transmission power. The mobile station apparatus monitors (monitors) a physical downlink control channel addressed to itself before transmitting / receiving a layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and By receiving the physical downlink control channel, radio resource allocation information called uplink assignment (or uplink grant) at the time of transmission and downlink assignment (or downlink grant) at the time of reception is physically downlink controlled. Need to get from channel.

  The physical uplink control channel (PUCCH) is a reception acknowledgment (ACK / NACK: Acknowledgement / Negative Acknowledgement) of data transmitted on the physical downlink shared channel and downlink propagation path information (CQI: Channel). It is used to perform a scheduling request (SR) that is an uplink radio resource request.

  A physical downlink shared channel (PDSCH) is used to notify paging and broadcast information as a layer 3 message that is downlink control data in addition to downlink data. Radio resource allocation information (downlink assignment) of the physical downlink shared channel is indicated in advance by the physical downlink control channel.

  A physical uplink shared 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 (uplink assignment) of the physical uplink shared channel is indicated in advance by the physical downlink control channel.

  A physical random access channel (PRACH) is a channel used to notify a preamble sequence and has a guard time. The preamble sequence is configured so as to express 6-bit information by preparing 64 types of sequences. The physical random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus. The mobile station apparatus transmits a radio resource request when the physical uplink control channel is not set, and transmission timing adjustment information (timing advance (TA)) required to match the uplink transmission timing with the reception timing window of the base station apparatus. The physical random access channel is used to request the base station apparatus.

  Specifically, the mobile station apparatus transmits a preamble sequence using the radio resource for the physical random access channel set by the base station apparatus. The mobile station apparatus that has received the transmission timing adjustment information sets a transmission timing timer (TA timer) that counts the effective time of the transmission timing adjustment information. During the effective time, the transmission timing adjustment state is set. The state is managed as an adjustment state. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Example of communication network configuration of the present invention]
FIG. 9 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 a plurality of frequencies (component carrier or incompatible carrier, Band1 to Band3) by carrier aggregation, there is a communication network configuration. One base station apparatus 2 includes transmission apparatuses 11 to 13 (and reception apparatuses 21 to 23 (not shown)) for each of a plurality of frequencies, and the configuration in which each base station apparatus 2 controls each frequency is simplified. It is suitable from the viewpoint of conversion. The configuration of the base station apparatus 2 is not limited to FIG. However, the base station apparatus 2 may be configured to transmit a plurality of frequencies with a single transmission apparatus because the plurality of frequencies are continuous frequencies. Furthermore, a configuration in which transmission / reception timing differs for each frequency may be used. The number of transmitting devices and receiving devices and the frequency at which transmission and reception can be performed may be different. The communicable range of each frequency controlled by the transmission device of the base station device 2 is regarded as a cell. At this time, the areas (cells) covered by each frequency may have different widths and different shapes.

  However, in the description to be described later, each of the areas covered by the frequency of the component carrier configured by the base station apparatus 2 is referred to as a cell, and this is the definition of a cell in an actually operated communication system. Note that it can be different. 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. Moreover, it may be defined as an extended cell different from the conventional cell. 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.

  Note that, incompatible carriers do not have some signals or channels transmitted on component carriers, so cells cannot be configured with incompatible carriers alone and cannot be used for communication. Carrier aggregation is communication by a plurality of cells using a plurality of component carriers, and is also referred to as cell aggregation. The mobile station apparatus 1 may be wirelessly connected to the base station apparatus 2 via a relay station apparatus (or repeater) for each frequency. That is, the base station apparatus 2 of the present invention can be replaced with a relay station apparatus.

  The third generation base station apparatus 2 defined by 3GPP is referred to as a Node B (NodeB), and the base station apparatus in EUTRA and Advanced EUTRA is referred to as an eNodeB (eNodeB). Note that the third-generation mobile station device 1 defined by 3GPP is referred to as UE (User Equipment). 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 macro cell, a femto cell, a pico cell, or a nano cell according to the size of the area that can communicate with the mobile station device 1. . When the mobile station apparatus 1 can communicate with a certain base station apparatus 2, a cell used for communication with the mobile station apparatus 1 among the cells of the base station apparatus 2 is a serving cell. The other cells are referred to as neighboring cells. That is, when the mobile station apparatus 1 and the base station apparatus 2 communicate using a plurality of cells using carrier aggregation, there are a plurality of serving cells.

[Wireless resource allocation method]
The base station apparatus 2 notifies the mobile station apparatus 1 of available radio resources, and the mobile station apparatus 1 transmits data or receives data using the radio resources. This available radio resource allocation method is notified to the mobile station apparatus 1 using radio resource allocation information included in the physical downlink control channel PDCCH. As the radio resource allocation method in EUTRA, the following three typical methods are prepared according to the scheduling policy of the base station apparatus 2.

  In the first radio resource allocation method, a predetermined number of consecutive resource block groups (resource block groups) are created based on a system bandwidth that is a frequency bandwidth of a cell (component carrier). This is a radio resource allocation method in a bitmap format in which each bit is designated over the system bandwidth. For example, when the cell system bandwidth is configured with 50 resource blocks, the resource block group is configured with 3 resource blocks, and when the cell system bandwidth is configured with 110 resource blocks, the resource A block group is composed of four resource blocks.

  The relationship between the number of resource blocks included in the resource block group and the size of the system bandwidth uses a value uniquely determined in advance by the system, is notified by broadcast information, or is a base station by an individual message such as an L3 message The notification is sent from the device 2 to the mobile station device 1.

  In the second radio resource allocation method, a predetermined number of consecutive resource block groups (resource block groups) are created based on the system bandwidth, which is the frequency bandwidth of a cell (component carrier), and several resource block groups are created. This is a radio resource allocation method in which a bit for designating a subset and a bit for designating a resource block in the subset are designated in combination. For example, when the system bandwidth of a cell is composed of 50 resource blocks, the resource block group is composed of 3 resource blocks, and each resource block group is allocated in order so as to belong to one of the 3 subsets. . On the other hand, when the cell system bandwidth is composed of 110 resource blocks, the resource block group is composed of 4 resource blocks, and each resource block group is allocated in order so as to belong to one of the 4 subsets. .

  The relationship between the number of resource blocks included in the resource block group, the size of the system bandwidth, and the number of subsets uses a value that is uniquely determined in advance by the system, is notified by broadcast information, or is an L3 message, etc. The mobile station apparatus 1 is notified from the base station apparatus 2 by an individual message.

  The third radio resource allocation method encodes information on the start position number of the resource block to be allocated and information indicating the number of consecutive resource blocks to be allocated in the system bandwidth which is the frequency bandwidth of the cell (component carrier). This is a radio resource allocation method specified. For example, if the system bandwidth of a cell is composed of 50 resource blocks, # 0 to # 49 are designated as the start positions, and the number of consecutive resource blocks is a minimum of 1 to a maximum so as not to exceed the system bandwidth. Up to 50 is specified.

[Component carrier configuration setting example]
FIG. 10 shows downlink component carriers configured by the base station device 2 for the mobile station device 1 when the mobile station device 1 according to the embodiment of the present invention performs carrier aggregation, and uplink components. It is the figure which showed an example of the correspondence of a carrier. FIG. 10 shows the correspondence relationship between two downlink component carriers (downlink component carrier DL_CC1, downlink component carrier DL_CC2) and two uplink component carriers (uplink component carrier UL_CC1, uplink component carrier UL_CC2). However, the present invention is not limited to the case of two component carriers. The downlink component carrier DL_CC1 and the uplink component carrier UL_CC1 in FIG. 10, and the downlink component carrier DL_CC2 and the uplink component carrier UL_CC2 are cell-specific connected (Cell Specific Linkage).

  The cell-specific connection is, for example, a correspondence relationship (linkage relationship) between uplink and downlink frequency bands accessible to the base station device 2 when the mobile station device 1 is not carrier-aggregated. The part of the broadcast information (SIB2: System Information Block Type 2) indicates the corresponding relationship. The cell specific connection is also referred to as SIB2 linkage. The correspondence relationship between the uplink and downlink frequencies in the cell is explicitly indicated as frequency information in broadcast information, or when not explicitly indicated, the uplink and downlink frequencies are uniquely determined for each operating frequency. It is instructed implicitly by using information on the specified frequency difference. In addition to these methods, other methods may be used as long as the correspondence relationship between uplink and downlink frequency bands can be shown for each cell.

  On the other hand, the base station apparatus 2 may individually set the correspondence relationship between the downlink component carrier and the uplink component carrier for each mobile station apparatus 1 separately from the cell-specific connection (individual connection: UE Specific Linkage). Is possible. At this time, the setting of the individual connection is indicated by the RRC message. The base station apparatus 2 can also assign a plurality of settings (configurations) necessary for transmission of the physical random access channel for each uplink component carrier or each uplink frequency.

[Example of configuration of incompatible carrier]
FIG. 11 shows component carriers set by the base station device 2 for the mobile station device 1 when the mobile station device 1 according to the embodiment of the present invention performs carrier aggregation using carrier segments, It is the figure which showed an example of the correspondence of these. Note that using a carrier segment means communication using an additional radio resource (extended frequency band) that can be used by the carrier segment. FIG. 11 illustrates an example in which a downlink segment and an uplink segment are set for a component carrier (cell) configured by a downlink component carrier DL_CCn and an uplink component carrier UL_CCn.

  The part shown as a downlink segment in the figure is a carrier segment extended with respect to the downlink component carrier DL_CCn. Moreover, the part shown as an uplink segment in a figure is a carrier segment extended with respect to uplink component carrier UL_CCn. When the carrier aggregation is not used, the mobile station apparatus 1 and the base station apparatus 2 in FIG. 11 communicate in the frequency band (normal bandwidth) of DL_CCn and UL_CCn, and aggregate the carrier segments as the carrier aggregation. In the case of using it, communication is performed in the range of the frequency band (extended frequency bandwidth) to which the carrier segment is added.

  Note that the base station apparatus 2 can set (add) only one of the downlink segment and the uplink segment to the mobile station apparatus 1. Also, the uplink and downlink normal bandwidths for setting carrier segments may be different from each other. For example, a carrier segment may be set for a cell having a downlink normal bandwidth of 10 MHz and an uplink normal bandwidth of 5 MHz. Further, the frequency bandwidth (extended frequency bandwidth) of the uplink and downlink extended frequency bands after setting the carrier segment may be different from each other. For example, the expanded downlink bandwidth may be 20 MHz, and the expanded uplink bandwidth may be 15 MHz. However, the upper limit of the expanded frequency bandwidth is preferably limited so as not to exceed 20 MHz (corresponding to 110 resource blocks) in order to simplify the radio configuration of the mobile station apparatus 1.

  The carrier segment to be set does not need to have the same bandwidth at both ends of the frequency band to be added, and may be asymmetric. That is, among the carrier segments set in DL_CCn or UL_CCn, it is possible to set a carrier segment having a low frequency side of 5 MHz and a high frequency side of 10 MHz.

  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, detailed descriptions of known functions and configurations related to the present invention will be omitted if it is determined that the gist of the present invention will be obscured.

<First Embodiment>
A first embodiment of the present invention will be described below. This embodiment shows a radio resource allocation method when carrier aggregation using a carrier segment as an incompatible carrier is set.

  FIG. 1 is a block diagram showing an example of a mobile station apparatus 1 according to the first 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 control unit 106, a coding unit 107, a modulation unit 108, a transmission unit 109, and a timing management unit 110. The upper layer 111 is configured. The upper layer 111 includes RRC (Radio Resource Control) that performs radio resource control. In addition, the random access control unit 106 provides a partial function of a MAC (Medium Access Control) that manages the data link layer.

  Prior to reception, mobile station apparatus control information is input from the upper layer 111 to the control unit 105, and control information related to reception is appropriately input to the reception unit 101, the demodulation unit 102, and the decoding unit 103 as reception control information. The mobile station apparatus control information is information necessary for radio communication control of the mobile station apparatus 1 configured by reception control information and transmission control information, is set by the base station apparatus 2 and system parameters, and requires an upper layer 111. In response, the data is input to the control unit 105. The reception control information includes information such as reception timing, multiplexing method, and radio resource arrangement information regarding each channel in addition to information on the reception frequency band.

  The reception signal is received by the reception unit 101. The receiving unit 101 receives a signal in the frequency band specified by the reception control information. The received signal is input to the demodulation unit 102. Demodulation section 102 demodulates the received signal, inputs the signal to decoding section 103, correctly decodes the downlink data and downlink control data, and inputs each decoded data to the upper layer. The measurement processing unit 104 measures the reception quality (SIR, SINR, RSRP, RSRQ, RSSI, path loss, etc.) of the downlink reference signal for each cell (component carrier), the physical downlink control channel or the physical downlink shared channel. Based on the measurement result of the reception error rate, downlink measurement information is generated, and the downlink measurement information is output to the upper layer 111. In the upper layer 111, downlink measurement information includes detection of a radio link failure (Radio link failure) accompanied by radio link re-establishment, implementation of radio link monitoring (Radio link monitoring) accompanied by suspension of uplink transmission, Used for evaluation of measurement events.

  Prior to transmission, mobile station apparatus control information is input from the upper layer 111 to the control unit 105, and control information related to transmission is transmitted as control information, a random access control unit 106, an encoding unit 107, a modulation unit 108, and a transmission unit 109. Is entered appropriately. 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. The random access control information is input from the upper layer 111 to the random access control unit 106. The random access control information includes preamble information, radio resource information for physical random access channel transmission, and the like. The upper layer 111 sets transmission timing adjustment information and a transmission timing timer used for adjusting the uplink transmission timing to the timing management unit 110 as necessary. The timing management unit 110 manages the uplink transmission timing state (transmission timing adjustment state or transmission timing non-adjustment state) based on the set information.

  The encoding unit 107 receives uplink data and uplink control data from the upper layer 111, and also receives random access data information related to transmission of the physical random access channel from the random access control unit 106. The encoding unit 107 generates a preamble sequence transmitted through the physical random access channel based on the random access data information. The encoding unit 107 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit. Modulating section 108 modulates the output from encoding section 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, and performs power amplification on a carrier wave of a predetermined frequency. Further, the uplink transmission timing is adjusted according to the transmission timing adjustment information input from the timing management unit 110 and transmitted. A physical uplink shared channel in which uplink control data is arranged typically constitutes a layer 3 message (radio resource control message; RRC message). 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 first embodiment of the present invention. The base station apparatus 2 includes a receiving unit 201, a demodulating unit 202, a decoding unit 203, a control unit 204, an encoding unit 205, a modulating unit 206, a transmitting unit 207, an upper layer 208, and a network signal transmitting / receiving unit 209.

  Upper layer 208 inputs downlink data and downlink control data to the encoding unit. The encoding unit 205 encodes the input data and inputs it to the modulation unit 206. Modulation section 206 modulates the encoded signal. The signal output from the modulation unit 206 is input to the transmission unit 207. Transmitter 207 maps the input signal to the frequency domain, then converts the frequency domain signal to a time domain signal, transmits the amplified signal on a carrier having a predetermined frequency, and transmits the signal. The physical downlink shared channel in which downlink control data is arranged typically constitutes a layer 3 message (RRC message).

  In addition, the reception unit 201 converts a signal received from the mobile station device 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 then input to the encoder 203 and decoded, and the correctly decoded uplink control data and uplink data are output to the upper layer 208. Base station apparatus control information necessary for control of each block is information necessary for radio communication control of the base station apparatus 2 configured by reception control information and transmission control information, and a higher-level network apparatus (MME or gateway apparatus). ) And system parameters, and the upper layer 208 inputs to the control unit 204 as necessary. The control unit 204 transmits base station apparatus control information related to transmission to each block of the encoding unit 205, modulation unit 206, and transmission unit 207 as transmission control information, and base station apparatus control information related to reception to the reception control information. Are appropriately input to each block of the receiving unit 201, the demodulating unit 202, and the decoding unit 203. The RRC of the base station device 2 exists as part of the upper layer 208.

  On the other hand, the network signal transmission / reception unit 209 transmits or receives a control message between the base station apparatuses 2 or between the upper network apparatus and the base station apparatus 2. In FIG. 2, the other components of the base station apparatus 2 are omitted because they are not related to the present embodiment.

  The network configuration of the communication system in which the mobile station device 1 and the base station device 2 are arranged can be the same as that shown in FIG.

  In the present invention, cells (component carriers) set in the mobile station apparatus 1 capable of carrier aggregation are, for example, two cells as shown in FIG. 10, that is, two downlink component carriers (DL_CC1, DL_CC2). ) And two uplink component carriers (UL_CC1, UL_CC2) are assumed to be set in the mobile station apparatus 1. When the activation (activation) of these component carriers is instructed explicitly or implicitly from the base station apparatus 2, the mobile station apparatus 1 is activated for downlink reception and uplink transmission. Component carriers can be used. On the other hand, when deactivation (deactivation) of the component carrier is instructed explicitly or implicitly from the base station apparatus 2, the mobile station apparatus 1 is inactive for downlink reception and uplink transmission. An activated component carrier cannot be used. Deactivation may be managed as a pair of downlink and uplink, or may be managed independently.

  Here, the activation or deactivation of the component carrier is configured to be controlled by an L2 message (layer 2 message) that can be interpreted by a layer 2 configuration task. That is, activation or deactivation is controlled by a control command (activation command, deactivation command) recognized by layer 2 after being decoded at the physical layer (layer 1). Note that the L2 message in EUTRA and Advanced EUTRA is notified by a control command (MAC control element: MAC Control Element) interpreted in the MAC layer.

  A cell composed of an uplink component carrier in which a physical uplink control channel for notifying a scheduling request is set, and a downlink component carrier that is cell-specifically connected to the uplink component carrier is a primary cell (Primary cell). It is called. Moreover, the cell comprised from component carriers other than a primary cell is called a secondary cell (Secondary cell). Although the primary cell is not subject to activation / deactivation control (that is, it is considered to be always activated), the secondary cell has an activation / deactivation state. In addition to being explicitly specified from the base station apparatus 2, the state is changed based on a timer set in the mobile station apparatus 1 for each component carrier.

  Further, the mobile station apparatus 1 detects a radio link failure based on the parameter specified by the base station apparatus 2 in the primary cell, and performs radio link monitoring using the parameter in at least the activated secondary cell. To do.

  The mobile station apparatus 1 may stop monitoring the physical downlink control channel used for scheduling the deactivated component carrier (secondary cell) or monitoring radio resource allocation information. Moreover, the mobile station apparatus 1 may stop transmission of a sounding reference signal regarding the uplink of the deactivated component carrier (secondary cell). Also, the mobile station apparatus 1 may perform measurement at a sampling rate lower than that in the activated state with respect to the downlink of the deactivated component carrier (secondary cell).

  FIG. 3 shows a serving cell (primary cell or secondary cell) as a preparation for the mobile station device 1 and the base station device 2 in the first embodiment to perform communication using an incompatible carrier by carrier aggregation. FIG. 7 is a sequence chart for explaining a procedure for adding (setting) an incompatible carrier.

  This sequence chart is started from a state (connected state) in which a connection using one cell is established between the mobile station apparatus 1 and the base station apparatus 2. In addition, even if one or more secondary cells are set in the mobile station apparatus 1, this embodiment is not affected. The base station apparatus 2 notifies the mobile station apparatus 1 of a measurement configuration (measurement configuration) for measuring a neighboring cell, and the mobile station apparatus 1 determines that the serving cell (primary cell or primary cell and secondary cell) is in accordance with the measurement setting. Cell) and neighboring cells.

  The base station apparatus 2 needs to perform carrier aggregation using incompatible carriers on the mobile station apparatus 1 based on the measurement results reported from the mobile station apparatus 1 and the buffer status report (buffer status report). If it is determined, an incompatible carrier addition message for instructing addition of an incompatible carrier to one or a plurality of serving cells is transmitted (step S101). The incompatible carrier addition message is preferably composed of a layer 3 message (RRC message).

  The mobile station apparatus 1 that has received the incompatible carrier addition message and added the incompatible carrier correctly receives the incompatible carrier addition message and notifies the base station apparatus 2 that the control has been appropriately performed. An incompatible carrier addition completion message is generated and transmitted to the base station apparatus 2 (step S102). The incompatible carrier addition completion message is preferably configured with a layer 3 message (RRC message) by setting the same message ID as the corresponding incompatible carrier addition message.

  Here, in step S101, the base station apparatus 2 transmits to the mobile station apparatus 1 including the setting parameter (information element) regarding the incompatible carrier to be added to the incompatible carrier addition message. The configuration parameters include at least (1) link destination cell information, (2) incompatible carrier index information, and (3) extended frequency bandwidth information.

  Specifically, the link destination cell information is an identifier indicating a cell (component carrier) to be communicated with when the incompatible carrier is activated when the incompatible carrier is activated. For example, the cell ID And the cell index is used to indicate the target cell. Associating the aggregated cells with incompatible carriers using link destination cell information is also referred to as linking cells and incompatible carriers based on link information. The cell index is an index number (for example, # 0 to # 7) designated from the base station apparatus 2 to the mobile station apparatus 1 for the serving cell to be carrier-aggregated. When using a cell ID, if an incompatible carrier is set for the primary cell, the cell ID (and frequency ID if necessary) of the primary cell is set as the link destination cell information. When using a cell index, when an incompatible carrier is set for the primary cell, the cell index number (for example, # 0) of the primary cell is set as the link destination cell information. On the other hand, when an incompatible carrier is set for the secondary cell, the cell index number (for example, any one of # 1 to # 7) of the secondary cell is set as the link destination cell information. The base station apparatus 2 can designate only compatible cells (zoned cells) as link destination cell information, and cannot designate incompatible carriers.

  In other words, the link destination cell information can be said to be information indicating a cell in which radio resource allocation information (uplink assignment, downlink assignment) for the incompatible carrier is transmitted. In other words, the link destination cell information can be said to be information indicating a cell in which the physical downlink control channel PDCCH for performing scheduling for the incompatible carrier is transmitted. When the mobile station apparatus 1 is a cell scheduled from another cell (cell # 2) indicated by the link destination cell information (cell # 1) (that is, the base station apparatus 2 Cell # 1 is scheduled based on the radio resource allocation information transmitted in cell # 2), and the cell in which the radio resource allocation information for the incompatible carrier with cell # 1 as an aggregation target is transmitted is cell # 2. Judgment is made and reception of radio resource allocation information is attempted in cell # 2.

  The incompatible carrier index information is an index number (for example, # 0 to # 7) serving as an identifier indicating an incompatible carrier set for the mobile station apparatus 1, and the base station apparatus 2 uses this index number as a non-identifier. By assigning each compatible carrier, one or a plurality of incompatible carriers to be added, deleted, changed, activated and deactivated can be designated for the mobile station apparatus 1. For example, a segment index is set for a carrier segment, and an extension index is set for an extension carrier. An index number set as incompatible carrier index information is specified at the same time when an incompatible carrier is set from the base station apparatus 2 to the mobile station apparatus 1 and is stored as information in the mobile station apparatus 1.

  The extended frequency bandwidth information is information indicating a frequency bandwidth aggregated by adding an incompatible carrier to a cell. For example, information indicating the frequency bandwidth of the incompatible carrier itself. Or it is the information which shows the aggregated frequency bandwidth (extended frequency bandwidth) after adding an incompatible carrier. Unless otherwise specified in this application, when it is described simply as an extended frequency bandwidth, it is an aggregated frequency bandwidth after adding an incompatible carrier (frequency bandwidth of a normal carrier + frequency bandwidth of a carrier segment) Width).

  When the addition is completed, the mobile station device 1 does not start transmission / reception using the incompatible carrier, but is in an inactive (deactivated) state in which only the setting is made. By using the inactive state for the incompatible carrier, the base station apparatus 2 can perform a highly flexible schedule according to the traffic state of the mobile station apparatus 1.

  FIG. 4 shows that the mobile station apparatus 1 and the base station apparatus 2 according to the first embodiment activate an incompatible carrier that has been added (set) to activate an incompatible carrier by carrier aggregation. It is a sequence chart for demonstrating the procedure which performs the used communication. This sequence chart needs to be started after adding an incompatible carrier for a serving cell, as shown at least in FIG.

  In step S201, the base station apparatus 2 notifies an incompatible carrier activation command (incompatible carrier activation) for the incompatible carrier added to the mobile station apparatus 1. The incompatible carrier activation command may be notified by a MAC control element, or may be notified by an RRC message or a physical downlink control channel. The mobile station apparatus 1 that has received the incompatible carrier activation command aggregates the incompatible carriers added by the carrier aggregation and the component carriers (primary cell or secondary cell).

  Here, in step S201, the base station apparatus 2 transmits to the mobile station apparatus 1 including information (incompatible carrier index information) specifying at least the incompatible carrier to be activated in the incompatible carrier activation command. The mobile station device 1 determines a component carrier (cell) to be aggregated based on the link destination information of the incompatible carrier designated by the incompatible carrier index information. Then, the mobile station apparatus 1 uses the activated incompatible carrier and the component carrier to be aggregated based on the extended frequency bandwidth information set for the incompatible carrier, to the base station apparatus 2. Start communication. Also, the base station apparatus 2 starts scheduling using the activated incompatible carrier and the component carrier to be aggregated at the frequency, and performs communication with the mobile station apparatus 1.

  FIG. 5 shows that the incompatible carrier is not used by the mobile station apparatus 1 and the base station apparatus 2 in the first embodiment deactivating the added (set) incompatible carrier. It is a sequence chart for demonstrating the procedure which communicates only with a component carrier. As shown in FIG. 4, at least this sequence chart needs to be started after an incompatible carrier for a primary cell is added and the incompatible carrier is activated.

  In step S301, the incompatible carrier deactivation command (incompatible carrier deactivation) for the incompatible carrier activated to the mobile station apparatus 1 is notified from the base station apparatus 2. The incompatible carrier deactivation command may be notified by a MAC control element, or may be notified by an RRC message or a physical downlink control channel. The mobile station device 1 that has received the incompatible carrier deactivation command cancels the aggregation of the incompatible carrier added by carrier aggregation and the component carrier (primary cell), and performs transmission / reception using the incompatible carrier. Stop. In addition, the mobile station apparatus 1 does not need to stop transmission / reception using a component carrier (primary cell).

  Here, in step S301, the base station apparatus 2 transmits to the mobile station apparatus 1 including information (incompatible carrier index information) specifying at least the incompatible carrier to be deactivated in the incompatible carrier deactivation command. . The mobile station apparatus 1 determines the component carrier (cell) whose aggregation is canceled based on the link destination cell information of the incompatible carrier designated by the incompatible carrier index information. Then, the mobile station apparatus 1 starts communication with the base station apparatus 2 based on the frequency bandwidth (normal bandwidth) of the component carrier in which the incompatible carrier is deactivated. In addition, the base station apparatus 2 starts scheduling using the component carrier that is the target of aggregation of the inactivated incompatible carriers at the frequency, and performs communication with the mobile station apparatus 1.

  FIG. 6 shows that the mobile station apparatus 1 and the base station apparatus 2 in the first embodiment delete the setting of the incompatible carrier added (set), so that only the component carrier is used without using the incompatible carrier. It is a sequence chart for demonstrating the procedure which performs communication. This sequence chart needs to be started after adding an incompatible carrier for a serving cell (primary cell or secondary cell), as shown at least in FIG.

  The base station apparatus 2 does not require the carrier aggregation using the incompatible carrier to the mobile station apparatus 1 based on the measurement result reported from the mobile station apparatus 1 or the buffer status report (buffer status report). If it is determined, an incompatible carrier deletion message for instructing deletion of an incompatible carrier is transmitted to the serving cell (step S401). The incompatible carrier deletion message is preferably composed of a layer 3 message (RRC message).

  The mobile station apparatus 1 that has received the incompatible carrier deletion message and deleted the added incompatible carrier correctly received the incompatible carrier deletion message, and informed the base station apparatus 2 that it has appropriately controlled. In order to notify, an incompatible carrier deletion completion message is generated and transmitted to the base station apparatus 2 (step S402). The incompatible carrier deletion completion message is preferably configured with a layer 3 message (RRC message) by setting the same message ID as the corresponding incompatible carrier deletion message.

  Here, in step S401, the base station apparatus 2 transmits to the mobile station apparatus 1 including information (incompatible carrier index information) specifying at least the incompatible carrier to be deleted in the incompatible carrier deletion message. The mobile station apparatus 1 determines the component carrier (cell) whose aggregation is canceled based on the link destination cell information of the incompatible carrier designated by the incompatible carrier index information. Then, the mobile station apparatus 1 starts communication with the base station apparatus 2 based on the frequency bandwidth (normal bandwidth) of the component carrier from which the incompatible carrier is deleted. In addition, the base station apparatus 2 starts scheduling using the component carrier that is the target of aggregation of the deleted incompatible carrier at the frequency and performs communication with the mobile station apparatus 1.

  In addition, when the base station device 2 changes the serving cell to which the incompatible carrier has been added (set) to another cell by handover or the like, the mobile station device 1 is set to the serving cell before the change. Automatically delete incompatible carriers.

  In the following, a specific description will be given focusing on examples using carrier segments, but the description of the sequence chart diagrams regarding the setting of incompatible carriers shown in FIGS. 3 to 6 applies to both carrier segments and extension carriers. Note that it is possible.

  With reference to FIG. 7, a description will be given of the correspondence relationship between the setting parameters for adding the above-described incompatible carriers, particularly carrier segments, and existing component carriers (cells).

  The upper part of FIG. 7 is a serving cell (located cell 1) set in the mobile station apparatus 1, and has a frequency bandwidth (normal bandwidth (for example, 5 MHz)) in EUTRA. In addition, the cell index number explicitly or implicitly set is number 0 (cell index # 0). The lower part shows a diagram in which carrier segments 1 are aggregated for the serving cell 1, and the setting parameters are cell index # 0 as link destination cell information, segment index # 0 as incompatible carrier index information, and extended frequency bandwidth information. XMHz is set as. The frequency band in which the serving cell 1 and the carrier segment 1 are arranged may be arranged in any frequency band as long as they are continuous frequency bands that do not interfere with each other (unless the same frequency band is used).

  In addition, although FIG. 7 illustrates the case where the frequency bandwidth after the expansion frequency bandwidth information is aggregated by carrier aggregation is illustrated, as described above, the configuration is made so as to indicate the frequency bandwidth of the carrier segment itself. It may be.

  At this time, the base station apparatus 2 sets the carrier segment 1 for the mobile station apparatus 1. The mobile station apparatus 1 confirms the cell to which the carrier segment is added based on the link destination cell information of the carrier segment 1. In the example of FIG. 7, the link destination cell of the carrier segment 1 is the serving cell 1. When activating the carrier segment, the base station apparatus 2 specifies the segment index number in the activation command and notifies the mobile station apparatus 1 of it. For example, when activating the carrier segment 1, the base station apparatus 2 notifies the mobile station apparatus 1 of the segment index # 0.

  When the activation of the carrier segment is instructed, the mobile station apparatus 1 performs communication by extending the frequency bandwidth based on the extended frequency bandwidth information of the carrier segment specified by the segment index. In the example of FIG. 7, when the carrier segment 1 is activated, communication is started with the extended frequency bandwidth 1 (x MHz) in which the serving cell 1 and the carrier segment 1 are aggregated. As described above, the information amount notified from the base station apparatus 2 to the mobile station apparatus 1 can be minimized by using the segment index except for notifying the first setting parameter. The segment index is used not only for the activation of the carrier segment but also for the deactivation of the carrier segment and the deletion and change of the carrier segment.

  The above-mentioned incompatible carrier addition message and incompatible carrier addition completion message, and incompatible carrier deletion message and incompatible carrier deletion completion message are added to the existing message without preparing a new message by adding necessary parameters respectively. RRC messages can be reused. For example, the RRC Connection Reconfiguration message can be reused for the incompatible carrier addition message and the incompatible carrier deletion message, and the RRC Connection Reconfiguration Complete message can be reused for the incompatible carrier addition completion message and the incompatible carrier deletion completion message.

  The timing when the mobile station apparatus 1 in which the carrier segment is set applies radio resource allocation using the carrier segment will be described with reference to FIG. The horizontal axis of FIG. 8 shows the history of time. FIG. 8 starts from a state where the mobile station apparatus 1 has at least one inactivated carrier segment set from the base station apparatus 2. Such a state can typically be regarded as a state after a new carrier segment is added or after a handover is performed.

  Time T01 indicates that the activation command is received for the carrier segment in which the mobile station device 1 is inactivated (inactivated state). The activation command may be notified by a MAC control element as usual, or may be notified by an RRC message or a physical downlink control channel. The base station device 2 transmits an activation command to the mobile station device 1 including the index number (incompatible carrier index information) of the carrier segment to be activated as described above.

  At this time, the mobile station apparatus 1 needs a processing time for applying a necessary setting accompanying activation of the carrier segment. The mobile station device 1 considers that the carrier segment is actually activated at time T02 when a delay time n1 (time uniquely determined by the system (for example, 8 subframes)) used for this processing time has elapsed. Also, time T02 coincides with the timing at which radio resource allocation using the carrier segment is applied.

  The mobile station apparatus 1 receives the physical downlink control channel PDCCH addressed to itself at any timing from time T02 to time T03, and receives radio resource allocation information (downlink assignment, When an uplink assignment is acquired, radio resource allocation based on an extended frequency bandwidth that aggregates carrier segments is performed. Specifically, the mobile station apparatus 1 sets the position of the resource block specified by the radio resource allocation information included in the physical downlink control channel PDCCH received after time T02 to the extended frequency bandwidth instead of the normal bandwidth. Interpret as specified based on. In other words, from time T02 to time T03, the mobile station apparatus 1 interprets the radio resource allocation information using the extended frequency bandwidth as the system bandwidth instead of the normal bandwidth.

  That is, in the case of the first radio resource allocation method, the base station device 2 determines the number of resource blocks to be included in the resource block group based on the extended frequency bandwidth, and the mobile station device 1 determines the resource blocks included in the resource block group. The number of blocks is obtained based on the extended frequency bandwidth.

  In the case of the second radio resource allocation method, the base station apparatus 2 determines the number of resource blocks included in the resource block group based on the extended frequency bandwidth, and the mobile station apparatus 1 determines the number of resource blocks included in the resource block group. Is determined based on the extended frequency bandwidth. Also, the base station apparatus 2 determines a subset to which the resource block group belongs based on the extended frequency bandwidth, and the mobile station apparatus 1 obtains a subset to which the resource block group belongs based on the extended frequency bandwidth.

  In the case of the third radio resource allocation method, the base station apparatus 2 determines the start position number of the resource block to be allocated based on the extended frequency bandwidth, and the mobile station apparatus 1 determines the start position number of the resource block to be allocated. Is determined based on the extended frequency bandwidth. Further, the base station apparatus 2 determines the number of consecutive resource blocks to be allocated based on the extended frequency bandwidth, and the mobile station apparatus 1 obtains the number of consecutive resource blocks to be allocated based on the extended frequency bandwidth.

  Considering that the information bandwidth (number of bits) of the radio resource allocation information included in the physical downlink control channel PDCCH may be changed because the system bandwidth is changed in common with the radio resource allocation method described above. . Specifically, when the base station apparatus 2 determines that the information size (number of bits) of the radio resource allocation information is different because the system bandwidth is changed by the activation of the carrier segment, the physical downlink control is performed. Note that the channel PDCCH encoding process needs to be appropriately performed according to the changed system bandwidth. Similarly, when the mobile station apparatus 1 determines that the information size (number of bits) of the radio resource allocation information is different due to the system bandwidth being changed by the activation of the carrier segment, the physical downlink control channel PDCCH Note that it is necessary to appropriately perform the decryption process according to the system bandwidth after the change.

  In addition, the base station apparatus 2 includes the radio resource allocation information for the extended frequency bandwidth 1 obtained by aggregating the serving cell 1 and the carrier segment 1 in the physical downlink control channel PDCCH transmitted in another serving cell. Is also possible. The mobile station apparatus 1 may acquire radio resource allocation information for the extended frequency bandwidth 1 obtained by aggregating the serving cell 1 and the carrier segment 1 from the physical downlink control channel PDCCH transmitted in another serving cell. Is possible. That is, when the system bandwidth is changed due to the activation of the carrier segment, the radio resource allocation information whose interpretation is changed according to the system bandwidth is transmitted in the serving cell indicated by the link destination cell information. This is radio resource allocation information of the physical downlink control channel PDCCH.

  Returning to FIG. 8, time T03 indicates that the deactivation command is received for the carrier segment in which the mobile station apparatus 1 is activated (activated state). The deactivation command may be notified by a MAC control element as usual, or may be notified by an RRC message or a physical downlink control channel. The base station apparatus 2 transmits a deactivation command to the mobile station apparatus 1 including the index number (incompatible carrier index information) of the carrier segment to be deactivated as described above.

  At this time, the mobile station apparatus 1 needs a processing time for applying a necessary setting associated with the deactivation of the carrier segment. The mobile station apparatus 1 considers that the carrier segment has actually been deactivated at time T04 when a delay time n2 (time uniquely determined by the system (for example, 4 subframes)) used for this processing time has elapsed. Further, time T04 coincides with the timing at which application of radio resource allocation using the carrier segment is canceled. Note that time T04 may be regarded as a timing at which the deletion of the carrier segment is notified.

  The mobile station apparatus 1 receives the physical downlink control channel PDCCH at any timing after time T04 and acquires radio resource allocation information (downlink assignment, uplink assignment) from the physical downlink control channel PDCCH. In this case, radio resources are allocated based on the normal bandwidth of the serving cell that does not aggregate carrier segments. Specifically, the mobile station apparatus 1 sets the position of the resource block specified by the radio resource allocation information included in the physical downlink control channel PDCCH received after time T04 to the normal bandwidth instead of the extended frequency bandwidth. Interpret as specified based on. In other words, after time T04, the mobile station apparatus 1 interprets the radio resource allocation information using the normal bandwidth as the system bandwidth instead of the extended frequency bandwidth (the interpretation of the radio resource allocation information of the mobile station apparatus 1 is , It returns to the state before time T01 when the carrier segments are not aggregated).

  Here, as the system bandwidth used for interpretation of the radio resource allocation information between time T03 and time T04, an extended frequency bandwidth or a normal bandwidth may be used.

  As described above, according to the first embodiment, the base station apparatus 2 uses the carrier segment when the mobile station apparatus 1 sets a carrier segment that is an incompatible carrier for the serving cell. As the necessary setting parameters, link destination cell information, incompatible carrier index information, and extended frequency bandwidth information are notified to the mobile station apparatus 1. Further, when the mobile station apparatus 1 and the base station apparatus 2 use the radio resource indicated by the carrier segment, the radio resource notified by the physical downlink control channel after a certain time has elapsed after the activation of the carrier segment. Change the interpretation of the information used for assignment. In addition, when the radio resource indicated by the carrier segment is not used, the mobile station device 1 and the base station device 2 are notified by the physical downlink control channel after a certain time has elapsed after the carrier segment is deactivated or deleted. Change the interpretation of information used for assigned radio resources.

  As described above, by using the method disclosed in the present embodiment, it is not determined at which timing the radio resource allocation of the incompatible carrier becomes effective, and between the mobile station apparatus 1 and the base station apparatus 2. Therefore, it is possible to solve the problem that a section in which communication cannot be performed correctly occurs due to a mismatch in communication state. That is, the base station apparatus 2 and the mobile station apparatus 1 use the normal bandwidth or the extended frequency for the system bandwidth used in the radio resource allocation information included in the physical downlink control channel PDCCH according to the timing at which the carrier segment becomes available. It operates by changing the interpretation as appropriate so as to use either one of the bandwidths.

  Based on the above description, a communication state mismatch between the mobile station apparatus 1 and the base station apparatus 2 is achieved by configuring a parameter necessary for setting a carrier segment that is an incompatible carrier and a radio resource allocation method thereof. Therefore, efficient radio resource allocation can be performed.

<Second Embodiment>
A second embodiment of the present invention will be described below. In the first embodiment, the timing for switching the system bandwidth used in the radio resource allocation information to one of the normal bandwidth and the extended frequency bandwidth by activating, deactivating and deleting incompatible carriers is unique to the system. Therefore, scheduling using a carrier segment cannot be started at an arbitrary timing.

  Therefore, for example, in the high-performance mobile station apparatus 1 that can instantaneously switch between the normal bandwidth and the extended frequency bandwidth, even if the extended frequency bandwidth becomes available, no allocation is actually performed. There was a possibility that a section would occur and the utilization efficiency of radio resources would deteriorate. Therefore, the second embodiment of the present invention shows a radio resource allocation method in which the base station apparatus 2 individually designates this switching timing for each mobile station apparatus 1.

  When the carrier segment is activated, the base station apparatus 2 of the present embodiment uses the RRC message, the MAC, and the timing at which the scheduling using the radio resource of the carrier segment, that is, the radio resource allocation in the carrier segment becomes valid. The mobile station apparatus 1 is notified using any of the control elements.

  When the RRC message is used, the base station device 2 sets time information until the radio resource of the carrier segment becomes valid in the incompatible carrier addition message for setting the carrier segment, and transmits the time information to the mobile station device 1. Then, the mobile station device 1 applies the time information notified by the incompatible carrier addition message, and changes the system bandwidth actually used in the radio resource allocation information to one of the normal bandwidth and the extended frequency bandwidth. Determine when to switch. When deleting the carrier segment setting, it can be configured to use the same time information as at the time of setting, or it can be configured to individually set the time information at the time of deletion at the time of setting, The time information at the time of deletion may be set in the incompatible carrier deletion message.

  When the MAC information element is used, the base station device 2 sets time information until the radio resource of the carrier segment becomes valid in the activation command for activating the carrier segment, and transmits the time information to the mobile station device 1. Then, the mobile station apparatus 1 applies the time information notified by the activation command, and switches the system bandwidth actually used in the radio resource allocation information to one of the normal bandwidth and the extended frequency bandwidth. Judging. It is possible to configure to apply the same time information as at the time of activation without including the time information at the time of deactivation, or set the timing to explicitly switch to include the time information in the deactivation command It can also be configured to.

  The base station apparatus 2 may set the time information described above as the delay time n1 (or delay time n2) of FIG. 8 or as a valid frame number or a combination of a frame number and a subframe number. .

  As described above, by using the method disclosed in the present embodiment, it is not determined at which timing the radio resource allocation of the incompatible carrier becomes effective, and between the mobile station apparatus 1 and the base station apparatus 2. Therefore, it is possible to solve the problem that a section in which communication cannot be performed correctly occurs due to a mismatch in communication state. That is, the base station apparatus 2 and the mobile station apparatus 1 use the normal bandwidth according to the set timing at which the carrier segment can be used as the system bandwidth used in the radio resource allocation information included in the physical downlink control channel PDCCH. It operates by changing the interpretation as appropriate so as to use either the extended frequency bandwidth or the extended frequency bandwidth.

  Based on the above description, the mobile station apparatus 1 can be set at an arbitrary timing in addition to the first embodiment by configuring parameters necessary for setting a carrier segment that is an incompatible carrier and a radio resource allocation method thereof. Since it is possible to perform radio resource allocation that does not cause a state mismatch between the base station apparatus 2 and the base station apparatus 2, efficient radio resource allocation can be performed.

  The embodiment described above is merely an example, and can be realized using various modifications and replacement examples. For example, this uplink transmission scheme can be applied to both communication systems of the FDD (frequency division duplex) scheme and the TDD (time division duplex) scheme. Further, it is obvious that both the carrier segment and the extension carrier can be set at the same time based on the description of the present embodiment. Further, for example, one bit is added to the physical downlink control channel PDCCH, and the physical downlink shared channel PDSCH is added to the physical downlink control channel PDCCH region of the incompatible carrier (or normal carrier and incompatible carrier) to be scheduled. The radio resource allocation method may be extended to indicate whether it is being transmitted.

  Further, for convenience of explanation, the mobile station device 1 and the base station device 2 of the embodiment have been described using functional block diagrams. However, the functions of each part of the mobile station device 1 and the base station device 2 or one of these functions The mobile station device 1 and the base station device 2 are controlled by recording a program for realizing the unit on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. You can do it. 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 a program is transmitted 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 101, 201 ... Reception part 102, 202 ... Demodulation part 103, 203 ... Decoding part 104 ... Measurement processing part 105, 204 ... Control part 106 ... Random access control Reference numerals 107, 205: encoding sections 108, 206: modulation sections 109, 207: transmission sections 110: timing management sections 111, 208: upper layer 209 ... network signal transmission / reception sections

Claims (15)

A mobile station apparatus and a base station apparatus are communication systems that perform communication by aggregating a frequency band of a cell and an extended frequency band that extends the frequency band of the cell,
The base station apparatus changes radio resource allocation information indicating allocation of radio resources used for communication with the mobile station apparatus at a timing when the extended frequency band is valid, and transmits the radio resource allocation information to the mobile station apparatus.
The mobile station apparatus receives the radio resource allocation information by determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid.   When the mobile station apparatus transmits the radio resource allocation information in a cell different from the cell, the mobile station apparatus determines that the radio resource allocation information transmitted in the different cell has been changed, and determines the radio resource allocation information. The communication system according to claim 1, wherein the communication system is received.   2. The communication system according to claim 1, wherein the radio resource allocation information is changed based on the extended frequency band after a predetermined time has elapsed since the extended frequency band is activated.   The said mobile station apparatus performs the decoding process of the allocation information of the said radio | wireless resource based on the said extended frequency band, after predetermined time passes after activating the said extended frequency band. Communication system.   The base station apparatus performs encoding processing of the allocation information of the radio resource based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band. Communication system. A mobile station apparatus and a base station apparatus are base station apparatuses of a communication system that perform communication by aggregating a frequency band of a cell and an extended frequency band that extends the frequency band of the cell,
A base station apparatus, wherein radio resource allocation information indicating allocation of radio resources used for communication with the mobile station apparatus is changed and transmitted to the mobile station apparatus at a timing when the extended frequency band becomes valid.   When the base station apparatus transmits the radio resource allocation information in a cell different from the cell, the base station apparatus changes the radio resource allocation information transmitted in the different cell and transmits the radio resource allocation information. The base station apparatus according to claim 6.   The base station apparatus according to claim 6, wherein the radio resource allocation information is changed based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band.   9. The base station apparatus according to claim 8, wherein the radio resource allocation information is encoded based on the extended frequency band after a predetermined time has elapsed since the extended frequency band is activated. A mobile station apparatus and a base station apparatus are mobile station apparatuses of a communication system that perform communication by aggregating a frequency band of a cell and an extended frequency band that extends the frequency band of the cell,
A mobile station apparatus that receives the radio resource allocation information by determining that the radio resource allocation indicated by the radio resource allocation information is changed at a timing when the extended frequency band becomes valid.   When the radio resource allocation information is transmitted in a cell different from the cell, it is determined that the radio resource allocation information transmitted in the different cell is changed, and the radio resource allocation information is received. The mobile station apparatus according to claim 10.   The mobile station apparatus according to claim 10, wherein the radio resource allocation information is determined to have been changed based on the extension frequency band after a predetermined time has elapsed since the extension frequency band was activated.   13. The mobile station apparatus according to claim 12, wherein a decoding process of the radio resource allocation information is performed based on the extended frequency band after a predetermined time has elapsed since activation of the extended frequency band. A radio resource allocation method in a communication system in which a mobile station apparatus and a base station apparatus perform communication by aggregating a frequency band of a cell and an extended frequency band that extends the frequency band of the cell,
The base station apparatus changes radio resource allocation information indicating allocation of radio resources used for communication with the mobile station apparatus at a timing when the extended frequency band becomes valid, and transmits the information to the mobile station apparatus;
The mobile station apparatus includes a step of determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid, and receiving the radio resource allocation information. Radio resource allocation method. An integrated circuit of a mobile station apparatus in a communication system in which a mobile station apparatus and a base station apparatus perform communication by aggregating a frequency band of a cell and an extended frequency band that extends the frequency band of the cell,
An integrated circuit, wherein the radio resource allocation information is received by determining that the radio resource allocation indicated by the radio resource allocation information has been changed at a timing when the extended frequency band becomes valid.