WO2013141073A1

WO2013141073A1 - Communication system, base station device, mobile station device, notification method, reporting method, and integrated circuit

Info

Publication number: WO2013141073A1
Application number: PCT/JP2013/056759
Authority: WO
Inventors: 秀和坪井; 克成上村; 恭之加藤
Original assignee: シャープ株式会社
Priority date: 2012-03-19
Filing date: 2013-03-12
Publication date: 2013-09-26
Also published as: JP2013197782A

Abstract

A base station device notifies a mobile station device about the settings of a channel state information reference signal used for measuring the channel state information set for each cell, including a first identifier for identifying the settings of a channel state information reference signal, and notifies the mobile station device about report settings for specifying a cell in which reference signal reception power and/or reference signal reception quality of the channel state information reference signal is to be measured. The mobile station device measures the reference signal reception power and/or the reference signal reception quality of the channel state information reference signal for the specified cell, and reports the measured result to the base station device.

Description

COMMUNICATION SYSTEM, BASE STATION DEVICE, MOBILE STATION DEVICE, NOTIFICATION METHOD, REPORTING METHOD, AND INTEGRATED CIRCUIT

The present invention relates to a communication system, a base station apparatus, a mobile station apparatus, a notification method, a reporting method, and an integrated circuit, and more particularly, a communication in which a mobile station apparatus measures a received signal based on one or more settings notified from the base station apparatus About the system.

The wireless access method and wireless network evolution of cellular mobile communications (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) is the third generation partnership project (3rd Generation). Partnership Project (3GPP), which is also referred to as LTE-A (LTE-Advanced, or “Advanced EUTRA)”, which develops LTE and applies new technologies. ) Is also being considered.

In Advanced EUTRA, in order to reduce or suppress interference with mobile station devices or increase received signal power, inter-cell cooperative (Cooperative Multipoint; CoMP) communication in which adjacent cells communicate with each other is considered. Has been. For example, as inter-cell cooperative communication, different weighting signal processing (precoding processing) is applied to a signal in a plurality of cells, and a plurality of base station devices cooperates to transmit the signal to the same mobile station device (Joint Processing; JP, Joint Transmission; also called JT), a method for scheduling mobile stations in cooperation with multiple cells (Coordinated Scheduling; CS), and cooperatively moving with multiple cells to apply beamforming A method of transmitting a signal to a station apparatus (Coordinated beamforming; CB) or a method of transmitting a signal using a predetermined resource only in one cell and not transmitting a signal in a resource overlapping with the resource in one cell (Blanking , Muting) etc. are being studied.

In addition, regarding a plurality of cells used for inter-cell cooperative communication, each cell may be a cell managed by a different base station device, or may be a cell managed by the same base station device. In addition, each cell may be configured by a radio unit (Remote Radio Head; RRH, Remote Radio Unit; RRU) controlled by the control unit of the base station body. The wireless unit may be connected to the base station main body with a wire such as an optical fiber, or may be connected wirelessly like a relay station device.

In 3GPP, in the discussion of Advanced EUTRA, in order to optimize the cell that performs inter-cell cooperative communication, it is considered to perform measurement using a channel state information reference signal (Channel Information Reference Symbol CSI-RS). (Non-Patent Document 1). At present, the CSI reference signal is defined such that resource information of one type of CSI reference signal is notified to the mobile station apparatus for quality measurement during MIMO transmission.

In Non-Patent Document 1, a plurality of types of resource information of the CSI reference signal are notified to the mobile station device, and the mobile station device receives the reference signal received power (Reference Signal Received Power; RSRP) or reference signal of the plurality of types of resources. It has been proposed that a cell for performing inter-cell cooperative communication can be selected by measuring each reception quality (Reference, Signal, Received Quality, RSRQ) and notifying the measurement result to a base station apparatus.

However, with the current specifications, it is not possible to notify the mobile station apparatus of a plurality of resource information related to the channel state information reference signal. In addition, the current specification specifies a mechanism for detecting and reporting the reference signal received power and reception quality by detecting the cell-specific reference signal quasi-signal of the neighboring cell, but the channel state information reference signal is used. Measurements for inter-cell cooperative communication are not specified.

The present invention has been made in view of the above points, and an object of the present invention is to efficiently notify a plurality of resource information related to channel state information reference signals and information related to measurement from the base station apparatus to the mobile station apparatus, and to obtain measurement results. It is to provide a communication system, a base station apparatus, a mobile station apparatus, a notification method, a reporting method, and an integrated circuit that can efficiently notify the mobile station apparatus to the base station apparatus.

(1) In order to achieve the above object, the present invention has taken the following measures. That is, the communication system of the present application is a communication system in which a mobile station apparatus performs communication by simultaneously connecting to a base station apparatus using cells of one or more frequency bands, and the base station apparatus performs channel state information measurement. The channel state information reference signal setting for each cell used for performing notification to the mobile station apparatus including a first identifier for identifying the setting of the channel state information reference signal, and the channel state As an object for measuring the reference signal reception power and / or the reference signal reception quality of the information reference signal, the mobile station apparatus is notified of a report setting for designating a cell, and the mobile station apparatus identifies the designated cell. The reference signal reception power and / or reference signal reception quality of the target channel state information reference signal is measured, and the measurement result is reported to the base station apparatus. It is characterized in.

(2) Also, in the communication system of the present application, the cell can be identified by a second identifier, the report setting can be identified by a third identifier, and when the report setting is set, Only one setting is set for the cell, and the mobile station apparatus reports the measurement result to the base station apparatus using the second identifier as the third identifier, and the base station The apparatus uses the second identifier reported from the mobile station apparatus as information for identifying the report setting.

(3) Further, in the communication system of the present application, the base station apparatus sets the first channel state information reference signal used for performing the channel state information measurement, and is used for other measurements. 2 channel state information reference signal setting, and the mobile station apparatus is configured to measure the reference signal reception power and / or reference signal reception quality in a cell that measures the reference signal reception power and / or reference signal reception quality. The reference signal reception power and / or reference signal reception quality of all the channel state information reference signals is measured.

(4) Further, in the communication system of the present application, the measurement result of the reference signal reception power and / or reference signal reception quality reported to the base station apparatus includes a first identifier.

(5) In addition, the base station apparatus of the present application is a base station apparatus that communicates with a mobile station apparatus using cells in one or more frequency bands at the same time, and measures channel state information set for each cell. A channel state information reference signal used for communication is notified to the mobile station apparatus including a first identifier for identifying the setting of the channel state information reference signal, and the channel state information reference signal The mobile station apparatus is notified of a report setting for designating a cell as a target for measuring the reference signal reception power and / or reference signal reception quality.

(6) In the base station apparatus of the present application, each cell can be identified by a second identifier, the report setting can be identified by a third identifier, and the base station apparatus can perform the report setting. Is set, only one setting is set for one cell, and the second identifier reported from the mobile station apparatus is used as information for identifying the report setting.

(7) Moreover, in the base station apparatus of the present application, the base station apparatus, in addition to the setting of the first channel state information reference signal used for performing the channel state information measurement, The mobile station apparatus is notified of the setting of the second channel state information reference signal, which is used for measuring the reference signal reception quality and is not included in the setting of the channel state information reference signal, as a different information element.

(8) Further, the mobile station apparatus of the present application is a mobile station apparatus that performs communication by connecting to a base station apparatus using cells of one or more frequency bands at the same time, and channel state information set for each cell A channel state information reference signal used for performing measurement is received from the base station apparatus including a first identifier for identifying the channel state information reference signal setting, and the channel state information reference signal is received. As a target for measuring a reference signal reception power and / or a reference signal reception quality of a signal, a report setting specifying a cell is received from the base station apparatus, and the channel state information reference signal for the specified cell is received. Reference signal reception power and / or reference signal reception quality are measured, and the measurement result is reported to the base station apparatus.

(9) Moreover, in the mobile station apparatus of the present application, the cell can be identified by a second identifier,
The report setting is identifiable by a third identifier, and when the report setting is set, only one setting is set for one cell, and the mobile station apparatus has the third identifier. As a result, the measurement result is reported to the base station apparatus using the second identifier.

(10) In the mobile station apparatus of the present application, the mobile station apparatus sets reference signal received power and / or reference in addition to setting of a first channel state information reference signal used for performing channel state information measurement. The second channel state information reference signal setting that is used for measurement of signal reception quality and is not included in the setting of the channel state information reference signal is received as a different information element from the base station apparatus, and the reference signal received power and / or Alternatively, in the cell for measuring the reference signal reception quality, the measurement of the reference signal reception power and / or the reference signal reception quality of all the first and second channel state information reference signals set in the cell is performed. And

(11) Further, the notification method of the present application is a notification method of a base station device that performs communication using a mobile station device and a cell of one or more frequency bands at the same time, and is configured to measure channel state information set for each cell. As a target for notifying the mobile station apparatus of the setting of the channel state information reference signal used for performing the reference, and for measuring the reference signal reception power and / or reference signal reception quality of the channel state information reference signal And a step of notifying a mobile station apparatus of a report setting for designating a cell.

(12) The reporting method of the present application is a reporting method for a mobile station apparatus that performs communication by connecting to a base station apparatus using cells of one or more frequency bands at the same time, and is a channel set for each cell. A step of receiving a setting of a channel state information reference signal used for performing state information measurement from the base station apparatus, and an object for measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal Receiving a report setting designating a cell from the base station apparatus, measuring a reference signal received power and / or a reference signal received quality of the channel state information reference signal for the designated cell, And reporting the measurement result to the base station apparatus.

(13) The integrated circuit of the present application is an integrated circuit mounted on a base station apparatus that performs communication using a mobile station apparatus and cells in one or more frequency bands at the same time, and is a channel set for each cell. A function for notifying the mobile station device of the setting of a channel state information reference signal used for performing state information measurement, and measuring the reference signal reception power and / or reference signal reception quality of the channel state information reference signal And a function for notifying a mobile station apparatus of a report setting for designating a cell.

(14) Further, the integrated circuit of the present application is an integrated circuit mounted on a mobile station apparatus that communicates by connecting to a base station apparatus using cells in one or more frequency bands simultaneously, and is set for each cell. A function of receiving from the base station apparatus the setting of a channel state information reference signal used to measure the channel state information, and the reference signal reception power and / or reference signal reception quality of the channel state information reference signal. As a measurement target, a function for receiving a report setting for designating a cell from the base station apparatus, and a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal for the designated cell are provided. And a function of measuring and reporting the measurement result to the base station apparatus.

According to the present invention, a plurality of resource information related to a channel state information reference signal and information related to measurement are efficiently notified from the base station apparatus to the mobile station apparatus, and a measurement result is efficiently notified from the mobile station apparatus to the base station apparatus. It becomes possible to do.

It is a block diagram which shows an example of the base station apparatus which concerns on embodiment of this invention. It is a block diagram which shows an example of the mobile station apparatus which concerns on embodiment of this invention. It is a figure which shows the user plane structure of the base station apparatus and mobile station apparatus which concern on embodiment of this invention. It is a figure which shows the control plane structure of the base station apparatus and mobile station apparatus which concern on embodiment of this invention. It is the flowchart which showed the example of the measurement setting procedure in the 1st Embodiment of this invention. It is the figure which showed the example of the measurement setting which concerns on embodiment of this invention. It is the figure which showed another example of the measurement setting which concerns on embodiment of this invention. It is the flowchart which showed the example of the measurement setting procedure in the 2nd Embodiment of this invention. It is a figure which shows an example of the communication network structure which concerns on embodiment of this invention. It is the figure which showed an example of the correspondence of the downlink component carrier which concerns on embodiment of this invention, and an uplink component carrier. It is the sequence chart which showed an example of the conventional RRM measurement setting management procedure.

DETAILED DESCRIPTION Before describing each embodiment of the present invention, a technique related to each embodiment of the present invention will be briefly described below.

[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 in the future in EUTRA and Advanced EUTRA, or the structure and format of the physical channel may be changed or added. However, even if changed or added, the description of each embodiment of the present invention will be provided. It does not affect.

In EUTRA and Advanced EUTRA, physical channel scheduling 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.

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

A physical broadcast information channel (Physical Broadcast Channel; PBCH) is transmitted for the purpose of notifying control parameters (broadcast information and 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 (Cell 識別子 Global Identifier; CGI) indicating a cell-specific identifier, a tracking area identifier (Tracking Area Identifier; TAI) for managing a standby area by paging, random access setting information (such as a transmission timing timer), Common radio resource setting information and the like are notified.

Downlink reference signals are classified into multiple types according to their use. For example, a cell-specific reference signal (CRS) is a pilot signal transmitted at a predetermined power for each cell, and is downlinked periodically in the frequency domain and the time domain based on a predetermined rule. Link reference signal. The mobile station apparatus measures the reception quality for each cell by receiving the cell-specific reference signal. The mobile station apparatus also uses the downlink cell specific reference signal as a reference signal for demodulating the physical downlink control channel or the physical downlink shared channel transmitted simultaneously with the cell specific reference signal. The sequence used for the cell-specific reference signal is a sequence that can be identified for each cell.

The downlink reference signal is also used for estimating downlink propagation path fluctuations. A downlink reference signal used for estimation of propagation path fluctuation is referred to as a channel state information reference signal (Channel State Reference Signals; CSI-RS). Also, the downlink reference signal set individually for each mobile station apparatus is called UE specific Reference Signals (URS) or Dedicated RS (DRS), and is used to demodulate the physical downlink control channel or the physical downlink shared channel. Used.

The physical downlink control channel (Physical Downlink Control Channel; PDCCH) is transmitted in some OFDM symbols from the beginning of each subframe, 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, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant (downlink assignment) at the time of reception from the physical downlink control channel. The physical downlink control channel is configured to be transmitted in the area of the resource block that is individually assigned to the mobile station apparatus from the base station apparatus in addition to the above-described ODFM symbol. Is also possible.

The physical uplink control channel (Physical Uplink Control Channel; PUCCH) is a data acknowledgment acknowledgment (Acknowledgement / Negative Acknowledgement; ACK / NACK) and downlink propagation path information (channel state information). ) Notification and an uplink radio resource allocation request (radio resource request), a scheduling request (Scheduling Request; SR) is used. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), and RI (Rank Indicator). Each indicator may be expressed as “Indication”, but its use and meaning are the same.

In addition to downlink data, the physical downlink shared channel (Physical Downlink Shared Channel; PDSCH) is also used to notify the mobile station apparatus of broadcast information (system information) that is not notified in the paging or physical broadcast information channel as a layer 3 message. used. The radio resource allocation information of the physical downlink shared channel is indicated by the physical downlink control channel.

The physical uplink shared channel (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. In addition to uplink data, it is also used to notify the base station apparatus of uplink control information as a layer 3 message. Similarly to the downlink, the radio resource allocation information of the physical uplink shared channel is indicated by the physical downlink control channel.

An uplink reference signal (Uplink Reference Signal) (also referred to as an uplink pilot signal or an uplink pilot channel) is used by the base station device to demodulate the physical uplink control channel PUCCH and / or the physical uplink shared channel PUSCH. A demodulation reference signal (Demodulation Reference Signal; DMRS) to be used and a sounding reference signal (Sound Reference Reference Signal; SRS) used mainly by the base station apparatus to estimate an uplink channel state are included. The sounding reference signal includes a periodic sounding reference signal (Periodic SRS) and an aperiodic sounding reference signal (Aperiodic SRS).

The physical random access channel (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 device requests radio resources when the physical uplink control channel is not set, and transmission timing adjustment information (timing advance (Timing Advance; TA)) necessary to match the uplink transmission timing with the reception timing window of the base station device. 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 that measures the effective time of the transmission timing adjustment information that is commonly set by the broadcast information (or set individually by the layer 3 message), The uplink state is managed while the transmission timing timer is valid (during time measurement) during the transmission timing adjustment state, and outside the valid period (during stop), the transmission timing is not adjusted (transmission timing is not adjusted). The layer 3 message is a control plane (Control-plane) message exchanged between the mobile station apparatus and the base station apparatus in the RRC (Radio Resource Control) layer, and is used in the same meaning as the RRC signaling or RRC message. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Career aggregation]
The carrier aggregation is a technique for aggregating (aggregating) frequencies (component carriers or frequency bands) of a plurality of different frequency bands (frequency bands) and treating 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 device having the capability of carrier aggregation considers these as one frequency bandwidth of 100 MHz and accesses them. 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 band is 800 MHz band, 2.4 GHz band, and 3.4 GHz band, one component carrier is 800 MHz band, another component carrier is 2 GHz band, and another component carrier is 3.4 GHz band. It may be transmitted.

Also, it is possible to aggregate a plurality of 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 frequency bandwidth is preferably equal to one of the conventional cell frequency bandwidths in consideration of backward compatibility. The base station apparatus assigns uplink or downlink to the mobile station apparatus based on various factors such as the amount of data buffer that is staying, the reception quality of the cell reported from the mobile station apparatus, the load in the cell, and QoS. The number of component carriers can be increased or decreased. Note that the number of uplink component carriers that the base station apparatus assigns (sets or adds) to the mobile station apparatus is desirably the same as or less than the number of downlink component carriers.

[Communication network configuration]
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 2 can be wirelessly connected to the base station apparatus 1 by using frequency bands of a plurality of frequencies (component carriers, Band 1 to Band 4) simultaneously by carrier aggregation, there is a certain communication network configuration. One base station apparatus 1 includes transmitters 11 to 14 (and four receivers (not shown)) for each of a plurality of frequencies, and a configuration in which control of each frequency is performed by one base station apparatus 1 simplifies control. It is preferable from the viewpoint. The configuration of the base station apparatus 1 is not limited to FIG.

However, the base station apparatus 1 may be configured to transmit a plurality of frequencies with a single transmitter 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 transmitters and receivers and the frequency at which transmission and reception can be performed may be different. The communicable range of each frequency controlled by the transmitter of the base station apparatus 1 is regarded as a cell. At this time, the areas (cells) covered by each frequency may have different widths and different shapes. Moreover, the area to cover may differ for every frequency.

However, in the description to be described later, the area covered by the frequency of the component carrier that the base station apparatus 1 constitutes will be referred to as a cell, which is the mobile station apparatus or base station in each embodiment of the present invention. Note that the definition of a cell in a communication system that actually operates the device may 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 a component carrier as a cell in each embodiment of the present invention, even if a case that differs from the definition of a cell in an actually operated communication system occurs, the gist of each embodiment of the present invention is not affected.

Note that carrier aggregation is communication by a plurality of cells using a plurality of component carriers (frequency bands), and is also referred to as cell aggregation. Note that the mobile station apparatus 2 may be wirelessly connected to the base station apparatus 1 via a relay station apparatus (or repeater) for each frequency. That is, the base station apparatus 1 of each embodiment of the present invention can be replaced with a relay station apparatus.

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

Further, in each embodiment, when simply referred to as a mobile station device or a base station device, a mobile station device and a base station device that support communication in which cells having a plurality of uplink transmission timings that differ depending on carrier aggregation are aggregated are supported. Show.

[Component carrier setting]
FIG. 10 shows the correspondence between the downlink component carrier set by the base station device 1 for the mobile station device 2 and the uplink component carrier when the mobile station device 2 according to the embodiment of the present invention performs carrier aggregation. It is the figure which showed an example of the relationship. FIG. 10 illustrates the correspondence relationship between four downlink component carriers (downlink component carriers DL_CC1 to DL_CC4) and three uplink component carriers (uplink component carriers UL_CC1 to UL_CC3). The configuration is not limited to the configuration example of the component carrier shown in FIG.

In FIG. 10, the downlink component carrier DL_CC1 and the uplink component carrier UL_CC1, the downlink component carrier DL_CC2 and the uplink component carrier UL_CC2, and the downlink component carrier DL_CC3 and the uplink component carrier UL_CC3 are cell-specific connected (Cell Specific Linkage). ing. Further, as in the downlink component carrier DL_CC4, it is also possible to configure a component carrier only for the downlink without uplink component carrier setting (no cell specific connection) for carrier aggregation.

Cell-specific connection is the correspondence (linkage, link information) between uplink and downlink component carriers. Typically, a part of broadcast information (System 示さ Information 一部 Block Type2; SIB2) indicates the correspondence. It is. The cell-specific connection is also referred to as SIB2 linkage. When the configuration (configuration) is explicitly notified as part of the broadcast information or when a component carrier (cell) in carrier aggregation is added, the RRC message (layer (3 messages), the setting of the corresponding relationship is notified, or when not explicitly instructed, the setting is notified implicitly by using information on the corresponding relationship between the uplink and the downlink specified uniquely. The When using the RRC message, the base station apparatus 1 may notify the mobile station apparatus 2 of cell-specific connection information different from the uplink component carrier indicated by the broadcast information of the downlink component carrier to be set.

On the other hand, the base station apparatus 1 may individually set the correspondence relationship between the downlink component carrier and the uplink component carrier for each mobile station apparatus 2 separately from the cell-specific connection (individual connection: UE Specific Linkage). Is possible. In FIG. 10, downlink component carrier DL_CC3 and uplink component carrier UL_CC2 are individually connected. At this time, the setting of the individual connection is indicated by an RRC message (layer 3 message). The base station apparatus 1 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.

The cell-specific connection is typically used to indicate a correspondence relationship between uplink and downlink frequencies used for communication with the base station device 1 when the mobile station device 2 is not carrier-aggregated. . Further, it is used to indicate a correspondence relationship between uplink and downlink component carriers to which radio resource allocation notified by the physical downlink control channel is applied during carrier aggregation.

The individual connection is typically used to indicate which downlink component carrier the path loss used for the transmission power control of the uplink component carrier of the mobile station apparatus 2 is calculated. Further, the individual connection indicates which downlink component carrier transmits the physical downlink control channel PDCCH that notifies the radio resource allocation information for performing the scheduling (radio resource allocation) of the component carrier of the mobile station apparatus 2. Used for.

A cell composed of an uplink component carrier in which an uplink control channel is set for a radio resource request and a downlink component carrier that is cell-specifically connected to the uplink component carrier is a primary cell (Primary Cell; PCell) It is called. A cell composed of component carriers other than the primary cell is referred to as a secondary cell (Secondary cell; SCell).

The mobile station apparatus 2 receives a paging message in the primary cell, detects broadcast information update, performs random access for initial access procedures and scheduling requests, and does not perform these in the secondary cell. The primary cell is not subject to activation and deactivation control (that is, it is always considered to be activated), but the secondary cell is in a state of activation and deactivation. These state changes are explicitly specified from the base station apparatus 1 and are changed based on a timer set in the mobile station apparatus 2 for each component carrier. As described above, the primary cell and the secondary cell are collectively referred to as a serving cell.

In order to identify the secondary cell, the mobile station device 2 and the base station device 1 allocate cell indexes to the primary cell and the secondary cell, and use the cell index to select a serving cell to be added, deleted, or changed. Identify. The cell index of the primary cell is always 0 (zero), and any one of 1 to 7 is allocated as the cell index of the secondary cell.

Here, activation or deactivation of component carriers (ie, activation or deactivation of secondary cells) is configured to be controlled by an L2 (Layer 2) message that can be interpreted by a Layer 2 configuration task. . That is, activation or deactivation is controlled by a control command recognized by layer 2 after being decoded by 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.

The mobile station apparatus 2 may stop monitoring the uplink grant and downlink grant (downlink assignment) used for scheduling the deactivated component carrier (secondary cell). That is, monitoring of the physical downlink control channel may be stopped. Moreover, the mobile station apparatus 2 may stop transmission of the periodic sounding reference signal (Periodic SRS) which is an uplink reference signal regarding the uplink of the deactivated component carrier (secondary cell). Moreover, the mobile station apparatus 2 may stop transmission of a physical uplink control channel regarding the uplink of the deactivated component carrier (secondary cell). Further, the mobile station apparatus 2 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).

[Measurement]
FIG. 11 is a sequence chart for explaining an RRM (radio resource management) measurement setting management method for the mobile station apparatus 2 and the base station apparatus 1 in EUTRA.

In the example of FIG. 11, it is assumed that the base station apparatus 1 can use two different frequencies F1 and F2 as frequencies operated by the own station, and the mobile station apparatus 2 and the base station apparatus 1 are wirelessly connected at the frequency F1. Is established (radio resource control connection state (Radio Resource Control Connected: RRC_Connected)). Here, the base station apparatus 1 transmits a measurement setting message to cause the mobile station apparatus 2 to measure the reception quality of the cell in communication (located cell) and other cells (neighboring cells) (step S111). . The measurement setting message includes at least one measurement setting information for each frequency (frequency F1 and frequency F2) to be measured. The measurement setting information includes a measurement ID, a measurement target frequency (measurement object), a measurement target frequency ID corresponding to the measurement target frequency, a report setting including a measurement event, and a report setting ID corresponding to the report setting. Is done. A plurality of report setting IDs may be linked to one measurement target frequency ID. Similarly, one report setting ID may be linked to a plurality of measurement target frequency IDs.

A measurement event is, for example, when the reception quality of a cell-specific reference signal of a serving cell falls below or exceeds a predetermined threshold, or when the reception quality of a cell-specific reference signal of a neighboring cell falls below the serving cell This is information composed of a condition such as when the reception quality of a neighboring cell exceeds a predetermined threshold, and a parameter used to determine the condition. The parameter is set with a threshold, an offset value, a time required for establishment of a measurement event, and the like.

In step S112, the mobile station device 2 stores the measurement setting information set from the base station device 1 as internal information, and then starts the measurement process. Specifically, the mobile station apparatus 2 manages the measurement ID, the measurement target frequency ID, and the report setting ID so as to be linked together, and starts measurement based on the measurement information corresponding to each ID. . If these three IDs are linked to one, it is considered valid and the associated measurement is started. If these three IDs are not linked to one (one of the IDs is not set) ), The relevant measurement is not started as invalid. If the measurement setting information can be set without error, the mobile station apparatus 2 transmits a measurement setting completion message to the base station apparatus 1 in step S113.

When any of the set measurement events satisfies the condition according to the parameter, the mobile station device 2 transmits a measurement report message to the base station device 1 assuming that the measurement event is triggered. (Step S114). In the measurement report message, at least the measurement ID linked to the report setting ID of the triggered measurement event and, if necessary, the measurement result of the associated cell are set. Since the base station apparatus 1 knows to which measurement event report setting ID the measurement ID is linked, the mobile station apparatus 2 does not need to notify the report setting ID in the measurement report message.

In consideration of 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 embodiment of the present invention, when it is determined that a specific description of known functions and configurations related to the embodiment of the present invention obscures the gist of the embodiment of the present invention. Detailed description thereof will be omitted.

[First Embodiment]
A first embodiment of the present invention will be described below.

FIG. 1 is a block diagram showing an example of a base station apparatus 1 according to an embodiment of the present invention. The base station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a control unit 104, a coding unit 105, a modulation unit 106, a transmission unit 107, a network signal transmission / reception unit 108, and an upper layer 109.

The higher layer 109 outputs downlink traffic data and downlink control data to the encoding unit 105. The encoding unit 105 encodes each input data and outputs the encoded data to the modulation unit 106. Modulation section 106 modulates the signal input from encoding section 105. Further, the signal modulated in the modulation unit 106 is multiplexed with a downlink reference signal and mapped as a frequency domain signal. Transmitter 107 converts the signal input from modulator 106 into a time-domain signal, places the converted signal on a carrier having a predetermined frequency, performs power amplification, and transmits the signal. The downlink data channel in which the downlink control data is arranged typically constitutes a layer 3 message (RRC (Radio Resource Control) message).

Also, the receiving unit 101 converts a received signal from the mobile station device 2 (see FIG. 2) into a baseband digital signal. The digital signal converted by the reception unit 101 is input to the demodulation unit 102 and demodulated. The signal demodulated by the demodulator 102 is then input to the decoder 103 and decoded. Decoding section 103 appropriately separates the received signal into uplink traffic data and uplink control data, and outputs the separated signals to higher layer 109, respectively.

Base station apparatus control information necessary for controlling each of these blocks is input from the upper layer 109 to the control unit 104, and from the control unit 104, base station apparatus control information related to transmission is transmitted as transmission control information. The base station apparatus control information related to reception is appropriately input to each block of the reception unit 101, demodulation unit 102, and decoding unit 103 as reception control information in each block of the modulation unit 106 and transmission unit 107.

On the other hand, the network signal transmitting / receiving unit 108 transmits or receives a control message between a plurality of base station apparatuses 1 (or control station apparatus (MME), gateway apparatus (Gateway), MCE) and the base station apparatus 1. . Control messages are transmitted and received via a network line. Control messages are exchanged on logical interfaces called S1 interface, X2 interface, M1 interface, and M2 interface. In FIG. 1, the other components of the base station apparatus 1 are not related to the present embodiment, and are omitted.

FIG. 2 is a block diagram showing an example of the mobile station apparatus 2 according to the embodiment of the present invention. The mobile station apparatus 2 includes a reception unit 201, a demodulation unit 202, a decoding unit 203, a measurement processing unit 204, a control unit 205, a random access processing unit 206, a coding unit 207, a modulation unit 208, a transmission unit 209, an upper layer 210, The measurement unit 211 is configured.

Prior to reception, the upper layer 210 outputs the mobile station apparatus control information to the control unit 205. The control unit 205 appropriately outputs the mobile station apparatus control information related to reception to the reception unit 201, the demodulation unit 202, the decoding unit 203, and the measurement unit 211 as reception control information. The reception control information includes information such as demodulation information, decoding information, reception frequency band information, reception timing for each channel, multiplexing method, and radio resource arrangement information as reception schedule information.

The receiving unit 201 receives a signal from the base station apparatus 1 described later through one or more receivers (not shown) in the frequency band notified by the reception control information, and converts the received signal into a baseband digital signal. To the demodulator 202. In addition, the reception unit 201 outputs the received reference signal to the measurement unit 211. Demodulation section 202 demodulates the received signal and outputs it to decoding section 203. The decoding unit 203 correctly decodes the demodulated signal based on the reception control information, appropriately separates it into downlink traffic data and downlink control data, and outputs them to the upper layer 210, respectively. The measurement unit 211 measures RSRP, RSRQ, CSI, and the like of the received reference signal and outputs the measurement result to the upper layer 210.

The upper layer 210 activates / deactivates information such as addition, modification, or release of a component carrier to downlink control data, and an allocated component carrier (or a cell that combines uplink and downlink component carriers). When the information is included, the component carrier management unit 204 is notified of the information. Based on the notified content, the component carrier management unit 204 corrects or releases the parameter of the component carrier (cell) of the secondary cell number already assigned to the own station, or the component carrier (cell of a new secondary cell number). ) And the active / inactive state of each secondary cell. Further, when a plurality of assigned secondary cells have different transmission / reception timings, information on a cell group constituted by one or more cells having the same transmission / reception timing is stored. The information on the cell group includes information such as transmission / reception timing for each cell group, transmission timing timer timing status, and the like. The activation / deactivation information of the component carrier may be notified from the decoding unit 203 to the component carrier management unit 204 without passing through the upper layer 210.

Also, prior to transmission, the upper layer 210 outputs mobile station apparatus control information to the control unit 205. The control unit 205 appropriately outputs the mobile station apparatus control information related to transmission to the random access processing unit 206, the encoding unit 207, the modulation unit 208, and the transmission unit 209 as transmission control information. 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 upper layer 210 appropriately outputs the uplink traffic data and the uplink control data to the encoding unit 207 according to the uplink channel. The encoding unit 207 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit 208. Modulating section 208 modulates the signal encoded by encoding section 207. Also, the modulation unit 208 multiplexes the downlink reference signal with the modulated signal and maps it to the frequency band.

The transmission unit 209 converts the frequency band signal output from the modulation unit 208 into a time domain signal, places the converted signal on a carrier wave of a predetermined frequency, performs power amplification, and one or more transmitters (not shown) Send from.

Further, when the signal decoded by the decoding unit 203 includes information indicating a cell group to which the transmission timing before the handover is applied even after the handover, the information is transmitted through the upper layer 210 (or directly from the decoding unit 203). The carrier management unit 204 and the random access processing unit 206 are notified. The random access processing unit 206 determines whether or not the random access procedure after the handover is necessary based on the notified information and each component carrier information acquired from the component carrier management unit 204.

Further, after the handover, the component carrier management unit 204 performs a process of bringing the cell group to which the transmission timing before the handover is applied into an active state. In addition, in the cells belonging to the cell group, it is possible to perform uplink transmission without performing a random access procedure if the transmission timing timer is counting. Alternatively, the timing of the transmission timing timer may be continued while inactive after handover. In the latter case, when the demodulating unit 203 demodulates the signal instructing activation of the cell group from the base station apparatus 1, the corresponding cell is activated, and the cell that has become active Performs uplink transmission without performing a random access procedure. Only one transmission timing timer may be prepared for each mobile station apparatus or may be prepared for each cell group.

In FIG. 2, other components of the mobile station apparatus 2 are omitted because they are not related to the present embodiment.

Next, the structure of the radio interface protocol between the base station apparatus and the mobile station apparatus is shown. FIG. 3 is a block diagram showing a radio protocol structure (radio protocol) of a user plane (user plane). FIG. 4 is a block diagram showing a radio protocol structure of a control plane (control plane; C plane). The user plane is a protocol stack for user data transmission / reception, and the control plane is a protocol stack for control signal transmission / reception.

3 and 4, the physical layer (Physical layer), which is the first layer (layer 1), uses the above-described physical channel between different physical layers, that is, between the physical layer on the transmission side and the reception side. Communication takes place. The physical layer is connected to the upper media access control (MAC) layer via a transport channel, and the physical layer transfers information to the MAC layer via this transport channel. Perform (information transfer） service).

In the MAC layer of the second layer (layer 2), mapping between logical channels (logical channels) and transport channels, error correction by HARQ (Hybrid Automatic Automatic Repeats reQuest), transfer processing based on priority between logical channels, etc. It is carried out. The MAC layer is connected to a radio link control (Radio Link Control; RLC) layer, which is an upper layer, via a logical channel.

The RLC layer in the second layer supports data transfer reliability. There are three types of operation modes in the RLC layer, depending on the data transmission method, transparent mode (Transparent Mode; TM), non-acknowledged mode (Unacknowledged Mode; UM), and response mode (Acknowledged Mode; AM). In AM, error correction by ARQ, protocol error detection, and the like are performed.

The PDCP (Packet Data Convergence Protocol) layer in the second layer performs header compression to reduce the IP packet header size, data encryption, and decryption.

The radio resource control (Radio Resource Control; RRC) layer of the third layer (layer 3) is defined only in the control plane. The RRC layer broadcasts NAS (non-access stratum) and AS (access stratum) related information, manages RRC connection (Establishment / maintenance / release), configures radio bearer (Radio Bearer; RB), re- It performs re-configuration and release, mobility (handover), measurement management and reporting, QoS management, and the like.

The NAS layer located above the RRC layer performs session management and mobility management.

Here, the MAC layer and the RRC layer of the base station device 1 exist as part of the upper layer 109. The MAC layer of the mobile station apparatus 2 exists as a part of the component carrier management unit 204, the random access processing unit 206, and a part of the upper layer 209, and the RRC layer of the mobile station apparatus 2 includes the component carrier management unit 204. And a part of the upper layer 209.

Subsequently, the measurement procedure of the CSI reference signal in the communication system of the present embodiment will be described with reference to FIG.

Here, the conventional CSI reference signal setting is notified by using the information element (CSI-RS-Config-r10) included in PhysicalConfigDedicatedSphyl-r10 and PhysicalConfigDedicatedScell-r10, which are information elements (Information element; IE) of the RRC message. One type could be set for each SCell. In the following description, the CSI reference signal setting in the present embodiment will be described as being notified using the information elements of PhysicalConfigDedicatedSted and PhysicalConfigDedicatedSCell-r10 as before, but is not limited to this, and is not limited to this. The information element may be newly defined and notified.

In FIG. 5, first, the base station apparatus 1 notifies the mobile station apparatus 2 of one or more CSI reference signal settings using an RRC message (step S51). The CSI reference signal setting notified here includes information uniquely indicating the signal sequence of the CSI reference signal, resource information indicating the arrangement of the CSI reference signal, and an index (first number) for identifying a plurality of CSI reference signal settings. 1 identifier). For example, when this index is defined as a sequential number from 0, it may be a sequential number from 0 in each cell (PCell and each SCell), or a sequential number from 0 for all settings of all cells. It is good. Alternatively, when the signal sequence of the CSI reference signal is different for each setting in each cell, information uniquely indicating this signal sequence can be used as an index substitute. In addition, the CSI reference signal setting may be a method of notifying a complete setting list every time there is a change, or by adding, correcting, or deleting information elements so that individual settings can be added, corrected, or deleted. It is also possible to do it.

Next, the base station apparatus 1 notifies the mobile station apparatus 2 of the CSI reference signal management measurement setting using the RRC message (step S52). Here, the CSI reference signal management measurement means measuring the reception quality (RSRP or RSRQ) of the CSI reference signal set in the CSI reference signal setting in order to select the CSI reference signal used in CoMP communication. To do. The CSI reference signal management measurement setting is uniquely associated with a combination of a setting (second identifier) that uniquely indicates a cell to be measured, such as a cell index, a report setting, and the two settings. Measurement ID (third identifier). The report setting includes information such as whether to report periodically (Periodic) or when an event occurs, whether to report RSRP or RSRQ (or both). Also, the measurement event is, for example, when the reception quality of an arbitrary CSI reference signal in a measurement target cell is lower than or exceeds a predetermined threshold value, and the reception quality of an arbitrary CSI reference signal is reception of a specific CSI reference signal. It is information composed of conditions such as when quality is below / above and parameters used to determine the conditions. The parameter is set with a threshold, an offset value, a time required for establishment of a measurement event, and the like.

The information elements for addition / change / deletion may be provided for each of the two settings and the measurement ID so that the addition / change / deletion can be performed individually. For example, a case where two measurement target cells and three report settings are notified and three measurement IDs are set for the combination of the cell and the report setting will be described with reference to FIG.

The base station apparatus 1 assigns

identifiers

0 and 1 to the cell with the cell index # 1 and the cell with the cell index # 2 as measurement target cells, and notifies the mobile station apparatus 2 of them. Further, the base station apparatus 1 assigns

identifiers

0, 1, and 2 to report setting 1, report setting 2, and report setting 3, respectively, as measurement settings, and notifies the mobile station apparatus 2 of them. Furthermore, the base station apparatus 1 notifies the mobile station apparatus 2 of the measurement ID associated with the combination of the measurement cell identifier and the report setting identifier.

In FIG. 6, a combination of the measurement target cell with identifier 0 and the report setting with identifier 0 is designated as measurement ID # 0. Similarly, the combination of the measurement target cell of identifier 0 and the report setting of identifier 1 is designated as measurement ID # 1, and the combination of the measurement target cell of identifier 1 and the report setting of identifier 2 is designated as measurement ID # 2. ing.

Here, it is assumed that multiple reports are set for one measurement target cell, but when only one report setting is set for one measurement target cell, the measurement target cell is uniquely set. The setting shown (eg, cell index) can be substituted for the measurement ID. For example, as shown in FIG. 7, the base station apparatus 1 sets one report setting for each cell index and notifies the mobile station apparatus 2 and the mobile station apparatus 2 sets the cell index as a measurement ID. . In addition, since the cell in which the report setting is not set is not a measurement target, the measurement ID may not be a sequential number. Or you may make it link | link the measurement ID of a serial number to the ascending order (or descending order) of the cell index to which the report setting was set.

Returning to FIG. 5, the mobile station apparatus 2 notified of the CSI reference signal management measurement setting in step S52 stores the notified measurement setting as internal information (step S53). Specifically, the mobile station apparatus 2 performs measurement by associating and managing the measurement ID, the measurement target cell identifier, and the report setting identifier. When the measurement target cell identifier and report setting identifier associated with the measurement ID exist, the measurement is performed on the measurement target cell associated with the setting as valid, and the measurement target associated with the measurement ID When either or both of the cell identifier and the report setting identifier do not exist, the setting is regarded as invalid and the measurement related to the measurement ID is not performed. If the measurement setting information can be set without error, the mobile station apparatus 2 notifies the base station apparatus 1 of completion of CSI reference signal management measurement setting (step S54), and starts measurement.

Thereafter, when the measurement target cell satisfies the report setting condition, the mobile station apparatus 2 transmits a CSI reference signal management measurement report using the RRC message to the base station apparatus 1 (step S55). The CSI reference signal management measurement report includes at least a measurement ID and an index set by the CSI reference signal setting notification. However, when only one report setting is set for one measurement target cell, and CSI reference signal management measurement report is performed for each cell, the measurement ID is not required.

The base station apparatus 1 that has received the CSI reference signal management measurement report selects a CSI reference signal for setting CSI measurement (used for CoMP communication) based on the reported management measurement result, and sets the CSI measurement setting as the mobile station. The device 2 is notified (step S56). The CSI measurement setting includes the index notified by the CSI reference signal setting notification and the type of CSI measurement report (Periodic or Aperiodic).

It should be noted that addition / correction / deletion of the measurement target cell and the report setting is performed at an arbitrary timing, and the determination of the validity / invalidity of the setting in step S53 is performed at the time of update.

As described above, the base station apparatus 1 notifies the mobile station apparatus 2 of all settings and report settings for performing CSI reference signal management measurement, and the mobile station apparatus 2 uses the measurement target cell specified by the report settings. In (Measurement Object), the CSI reference signal setting index for all the CSI reference signal settings set in the cell is measured as a measurement target, and the CSI reference signal setting index (if necessary) that matches the report setting conditions. Measurement value) is reported to the base station apparatus 1, and the base station apparatus 1 uses the same index as the CSI reference signal management measurement for the CSI reference signal setting for performing the CSI measurement necessary for CoMP operation based on the report. In this way, signaling related to a plurality of measurements can be made more efficient. Further, in a communication system in which only one report setting is set for one measurement target cell, an existing RRM measurement is performed by substituting a setting (for example, a cell index) uniquely indicating the measurement target cell as a measurement ID. Compared with this mechanism, signaling efficiency can be improved. Furthermore, when only one report setting is set for one measurement target cell, and CSI reference signal management measurement report is performed for each cell, only the result is notified without measuring ID. May be.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described. In the first embodiment, an example is shown in which all settings for performing CSI reference signal management measurement are notified by CSI reference signal setting notification. However, in this embodiment, a CSI reference signal (CSI for performing CSI measurement) used for CoMP is shown. An example in which a reference signal is notified separately will be described.

Since the configuration of the communication system (base station apparatus 1 and mobile station apparatus 2) used in the description of this embodiment is the same as that of the first embodiment, description thereof is omitted. Also, messages used for communication can use new messages or divert existing messages as in the first embodiment.

In FIG. 8, first, the base station apparatus 1 notifies the mobile station apparatus 2 of the CSI measurement setting using the RRC message (step S81). The CSI measurement setting notified here includes one or a plurality of CSI reference signal settings. Each CSI reference signal setting includes information uniquely indicating a signal sequence of the CSI reference signal, resource information indicating the arrangement of the CSI reference signal, and an index for identifying a plurality of CSI reference signal settings. For example, when this index is defined as a sequential number from 0, it may be a sequential number from 0 in each cell (PCell and each SCell), or a sequential number from 0 for all settings of all cells. It is good. Alternatively, when the signal sequence of the CSI reference signal is different for each setting in each cell, information uniquely indicating this signal sequence can be used as an index substitute. The CSI measurement setting also includes the type of CSI measurement report (Periodic or Aperiodic).

Furthermore, the base station apparatus 1 notifies the mobile station apparatus 2 of the additional CSI reference signal setting using another information element of the RRC message. The additional CSI reference signal setting notified here includes only one or a plurality of CSI reference signal settings not included in the CSI measurement setting. Each CSI reference signal setting includes information uniquely indicating a signal sequence of the CSI reference signal, resource information indicating the arrangement of the CSI reference signal, and an index for identifying a plurality of CSI reference signal settings. This index is set by the base station apparatus 1 so as not to overlap with the CSI reference signal setting index set in the CSI measurement setting. Here, the CSI reference signal setting and the additional CSI reference signal setting may be a method of notifying a complete setting list every time there is a change, or adding individual settings using addition / modification / deletion information elements. -A method that enables correction or deletion may be used.

Next, the base station apparatus 1 notifies the mobile station apparatus 2 of the CSI reference signal management measurement setting using the RRC message (step S82). Here, the CSI reference signal management measurement setting includes a setting (for example, a cell index) that uniquely indicates a cell to be measured, a report setting, and a measurement ID that is uniquely associated with a combination of the two settings. Is included. The report setting includes information such as whether to report periodically (Periodic) or when an event occurs, whether to report RSRP or RSRQ (or both). Also, the measurement event is, for example, when the reception quality of an arbitrary CSI reference signal in a measurement target cell is lower than or exceeds a predetermined threshold value, and the reception quality of an arbitrary CSI reference signal is reception of a specific CSI reference signal. It is information composed of conditions such as when quality is below / above and parameters used to determine the conditions. The parameter is set with a threshold, an offset value, a time required for establishment of a measurement event, and the like.

The mobile station apparatus 2 that is notified of the CSI reference signal management measurement setting in step S82 stores the notified measurement setting as internal information (step S83). Specifically, the mobile station apparatus 2 manages the measurement ID, the measurement target cell identifier, and the report setting identifier in association with each other, and starts measurement. When the measurement target cell identifier and report setting identifier associated with the measurement ID exist, the measurement is performed on the measurement target cell associated with the setting as valid, and the measurement target associated with the measurement ID If either or both of the cell identifier and the report setting identifier do not exist, the setting is regarded as invalid and the measurement related to the measurement ID is not performed. If the measurement setting information can be set without error, the mobile station apparatus 2 notifies the base station apparatus 1 of CSI reference signal management measurement setting completion (step S84) and starts measurement.

Thereafter, when the measurement target cell satisfies the report setting condition, the mobile station apparatus 2 transmits a CSI reference signal management measurement report using the RRC message to the base station apparatus 1 (step S85). The CSI reference signal management measurement report includes at least a measurement ID and an index set by the CSI reference signal setting notification. However, when only one report setting is set for one measurement target cell, and CSI reference signal management measurement report is performed for each cell, the measurement ID is not necessary.

The base station apparatus 1 that has received the CSI reference signal management measurement report determines CSI reference signal settings for performing CSI measurement based on the reported management measurement results, and sets the CSI measurement settings and additional CSI reference signal settings in the same manner as in step S81. Is notified to the mobile station apparatus 2 to perform resetting.

As described above, the base station apparatus 1 uses the CSI reference signal management measurement and the CSI reference signal setting used in CoMP (performs CSI measurement), the additional CSI reference signal setting used only in the CSI reference signal management measurement, The mobile station apparatus 2 is notified of the report setting, and the mobile station apparatus 2 uses the CSI reference signals of all CSI reference signal settings set in the cell as measurement targets in the measurement target cell specified by the report setting. The management measurement is performed, and the CSI reference signal setting index (and the measurement value if necessary) matching the report setting condition is reported to the base station apparatus 1, and the base station apparatus 1 determines the CSI reference signal based on the report. By resetting the setting and the additional CSI reference signal setting, it becomes possible to improve the efficiency of signaling related to a plurality of measurements, as in the first embodiment. .

In the first and second embodiments described above, the mobile station apparatus 2 manages, as measurement targets, all CSI reference signals set in the CSI reference signal set in the cell in the measurement target cell specified by the report setting. When measurement is performed, but it is desired to limit the CSI reference signal to be measured, information indicating the CSI reference signal to be measured may be added to the CSI reference signal management measurement setting. For example, the CSI reference signal setting index to be measured may be notified, or a bit string of the number of all CSI reference signal settings is prepared, and the measurement target is based on the state (0 or 1) of each bit. A CSI reference signal may be designated. Thereby, unnecessary measurement / reporting can be reduced, and power saving of the mobile station apparatus 2 can be achieved.

Further, in the first and second embodiments, the mobile station apparatus 2 starts measurement when the CSI reference signal management measurement setting can be performed without error. However, the present invention is not limited to this. The measurement may be started / stopped based on RRC signaling indicating stop. Thereby, unnecessary measurement / reporting can be reduced, and power saving of the mobile station apparatus 2 can be achieved.

In addition, the reception quality of the CSI reference signal is not limited to RSRP or RSRQ, but path loss and other measurement values (SIR, SINR, RSSI, BLER) may be used instead. It is also possible to use in combination. In addition, the names of the parameters shown in the embodiments are called for convenience of explanation, and even if the parameter names actually applied and the parameter names of the present application are different, the names of the invention claimed by the present application It does not affect the purpose.

As described above, the embodiments according to the present invention have been described. However, with respect to the base station apparatus and the mobile station apparatus according to the present invention, the functions of each part of the base station apparatus and the mobile station apparatus or a part of these functions are realized. The control shown in each embodiment may be performed by recording a program for recording on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. 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.

Further, each functional block used in each of the above embodiments may be realized as an LSI that is typically an integrated circuit. Each functional block may be individually formed into chips, 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 described above, the embodiments of the present invention have been described in detail based on specific specific examples. However, it is obvious that the gist of the present invention and the scope of the claims are not limited to these specific 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 ... Base station apparatus 2 ...

Mobile station apparatus

101, 201 ...

Reception part

102, 202 ...

Demodulation part

103, 203 ... Decoding

part

104, 205 ...

Control part

105, 207 ... Encoding

part

106, 208 ...

Modulation part

107, 209 ... Transmission unit 108 ... network signal transmission /

reception units

109 and 210 ... upper layer 204 ... component carrier management unit 206 ... random access processing unit 211 ... measurement unit

Claims

A communication system in which a mobile station apparatus performs communication by connecting to a base station apparatus using cells of one or more frequency bands simultaneously,
The base station apparatus includes a first identifier for identifying the setting of the channel state information reference signal with respect to the setting of the channel state information reference signal for each cell used for performing channel state information measurement. Notifying the mobile station device,
As a target for measuring the reference signal reception power and / or reference signal reception quality of the channel state information reference signal, the mobile station apparatus is notified of a report setting for specifying a cell,
The mobile station apparatus measures a reference signal reception power and / or reference signal reception quality of the channel state information reference signal for the designated cell, and reports the measurement result to the base station apparatus. A communication system characterized by the above.
The cell is identifiable by a second identifier;
The reporting configuration is identifiable by a third identifier;
When the report setting is set, only one setting is set for one cell,
The mobile station apparatus reports the measurement result using the second identifier as the third identifier to the base station apparatus,
The communication system according to claim 1, wherein the base station apparatus uses the second identifier reported from the mobile station apparatus as information for identifying the report setting.
The base station apparatus performs setting of a first channel state information reference signal used for performing the channel state information measurement and setting of a second channel state information reference signal used for other measurements. Notify
In the cell that measures the reference signal reception power and / or the reference signal reception quality, the mobile station apparatus receives the reference signal reception power and / or all of the first and second channel state information reference signals set in the cell. Alternatively, the communication system according to claim 1, wherein the reference signal reception quality is measured.
The communication system according to claim 1, wherein the measurement result of the reference signal reception power and / or reference signal reception quality reported to the base station apparatus includes a first identifier.
A base station apparatus that communicates with a mobile station apparatus using cells in one or more frequency bands simultaneously,
The mobile station including a first identifier that identifies the setting of the channel state information reference signal with respect to the setting of the channel state information reference signal used to perform channel state information measurement set for each cell Notify the device,
A base station apparatus that notifies the mobile station apparatus of a report setting for designating a cell as a target for measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal.
Each cell is identifiable by a second identifier;
The reporting configuration is identifiable by a third identifier;
The base station apparatus sets only one setting for one cell when setting the report setting,
The base station apparatus according to claim 5, wherein the second identifier reported from the mobile station apparatus is information identifying the report setting.
The base station apparatus is used for measuring a reference signal reception power and / or a reference signal reception quality in addition to setting a first channel state information reference signal used for performing the channel state information measurement, and The base station apparatus according to claim 5, wherein the mobile station apparatus is notified of the setting of the second channel state information reference signal not included in the setting of the channel state information reference signal as a different information element.
A mobile station apparatus that communicates by connecting to a base station apparatus using cells of one or more frequency bands simultaneously,
The base station including a first identifier for identifying the setting of the channel state information reference signal with respect to the setting of the channel state information reference signal used for performing channel state information measurement set for each cell Received from the device,
As a target for measuring the reference signal reception power and / or reference signal reception quality of the channel state information reference signal, a report setting for specifying a cell is received from the base station device,
A mobile station characterized by measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal for the designated cell and reporting the measurement result to the base station apparatus apparatus.
The cell is identifiable by a second identifier;
The reporting configuration is identifiable by a third identifier;
When the report setting is set, only one setting is set for one cell,
The mobile station apparatus according to claim 8, wherein the mobile station apparatus reports the measurement result to the base station apparatus using the second identifier as the third identifier.
The mobile station apparatus is used for measuring a reference signal reception power and / or a reference signal reception quality in addition to setting a first channel state information reference signal used for performing channel state information measurement, and the channel In the cell that receives the setting of the second channel state information reference signal not included in the setting of the state information reference signal as a different information element from the base station apparatus, and measures the reference signal reception power and / or the reference signal reception quality, 9. The mobile station apparatus according to claim 8, wherein reference signal reception power and / or reference signal reception quality of all the first and second channel state information reference signals set in the cell are measured.
A notification method of a base station apparatus that performs communication using a mobile station apparatus and a cell of one or more frequency bands simultaneously,
Notifying the mobile station apparatus of the setting of a channel state information reference signal used to perform channel state information measurement set for each cell;
A notification method comprising: notifying a mobile station apparatus of a report setting for designating a cell as a target for measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal. .
A method of reporting a mobile station apparatus that communicates by connecting to a base station apparatus using cells of one or more frequency bands simultaneously,
Receiving a setting of a channel state information reference signal used for performing channel state information measurement set for each cell from the base station apparatus;
Receiving a report setting designating a cell from the base station apparatus as an object for measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal;
Measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal for the designated cell, and reporting the measurement result to the base station apparatus. Reporting method.
An integrated circuit mounted on a base station apparatus that communicates with a mobile station apparatus using cells in one or more frequency bands simultaneously,
A function of notifying the mobile station apparatus of the setting of a channel state information reference signal used for performing channel state information measurement set for each cell;
An integrated circuit comprising a function of notifying a mobile station apparatus of a report setting for designating a cell as an object for measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal .
An integrated circuit mounted on a mobile station apparatus that communicates by connecting to a base station apparatus using cells of one or more frequency bands simultaneously,
A function of receiving from the base station device the setting of a channel state information reference signal used to perform channel state information measurement set for each cell;
A function of receiving a report setting designating a cell from the base station apparatus as an object for measuring a reference signal reception power and / or a reference signal reception quality of the channel state information reference signal;
A function of measuring a reference signal reception power and / or reference signal reception quality of the channel state information reference signal for the designated cell and reporting the measurement result to the base station apparatus. Integrated circuit.