WO2012107986A1

WO2012107986A1 - Wireless communication terminal, wireless communication device and wireless communication system, as well as measuring method

Info

Publication number: WO2012107986A1
Application number: PCT/JP2011/007321
Authority: WO
Inventors: 尚志田村; 西尾　昭彦; 千枝石田
Original assignee: パナソニック株式会社
Priority date: 2011-02-10
Filing date: 2011-12-27
Publication date: 2012-08-16

Abstract

A wireless communication terminal of a system, wherein a plurality of wireless communication devices perform multiple point coordination and transmit a wireless signal to the terminal, comprises: a receiving unit for receiving a message transmitted from the wireless communication devices to the terminal; a determining unit for determining whether to perform a measurement taking CoMP gain into consideration on the basis of the state of a CoMP gain consideration flag included in the message having a measurement setting comprising the CoMP gain consideration flag showing whether to take CoMP gain into consideration, and a setting for a reference signal required when performing the measurement that has taken CoMP gain into consideration; and a measurement unit for performing the measurement that has taken CoMP gain into consideration with respect to at least one communication cell provided by the wireless communication devices that perform multiple point coordination with respect to the terminal, using the reference signal that has been reception processed according to the setting of the reference signal included in the message, in the case where the determination unit has determined that the measurement that has taken CoMP gain into consideration is to be performed. Consequently, when the wireless communication terminal performs mobility control, accurate measurement of the home cell that has taken CoMP gain into consideration is possible.

Description

Wireless communication terminal, wireless communication device, wireless communication system, and measurement method

The present invention relates to a wireless communication system in which a plurality of wireless communication devices perform multipoint coordination and transmit a wireless signal to a wireless communication terminal, a wireless communication terminal and a wireless communication device used in the wireless communication system, and a wireless communication terminal It relates to the measurement method.

The standardization organization 3GPP (The 3rd Generation Generation Partnership Project) is promoting standardization of LTE-Advanced (Long Term Evolution Advanced: LTE-A) as the next generation communication standard compatible with the LTE (Long Term Evolution) scheme. .

In LTE, a network (Evolved Universal Terrestrial Radio Access Network: E-UTRAN) wireless communication device (hereinafter also referred to as “NE (Network Entity)”) provides one or more communication cells. Note that the wireless communication device may form a communication cell in cooperation with other wireless communication devices. For example, the repeater receives a radio wave from a radio communication base station, amplifies the radio wave, and transmits it. By doing so, cell coverage can be widened. A wireless communication terminal (User Equipment: UE) belongs to one of the communication cells. Hereinafter, the communication cell is simply referred to as “cell”, and the wireless communication terminal (UE) is simply referred to as “terminal”.

The wireless communication device is a device serving as a terminal access point, such as a wireless communication base station (E-UTRAN NodeB: eNB), an extended base station (Remote Radio Head: RRH), a relay device (Relay Node (RN) or repeater), etc. It is.

In LTE, when there is a neighboring cell with a reception environment better than the reception environment of the cell to which a connected terminal is connected (own cell), handover (hereinafter referred to as “the cell to which the terminal is connected) is switched from the own cell to the neighboring cell. Technology (also called “HO”). FIG. 18 is a sequence diagram illustrating an example of handover. The terminal (UE), based on the measurement setting (Measurement Configuration: MC) of the received signal included in “RRC Connection Reconfiguration”, receives power (Reference Signal Received Power: RSRP) or received quality (Reference Signal Received Quality: RSRQ). In addition, when a terminal satisfies an event (for example, a condition that the received power exceeds a threshold) based on the measurement setting (MC), the terminal communicates with the wireless communication apparatus (Source NE) to which the terminal is connected. Send a measurement result report (Measurement Report: MR). Based on the measurement result report (MR), the Source NE determines a radio communication device (Target NE) that is a handover destination of the terminal. Further, the Source NE sends a handover request (Handover Preparation) to the Target NE in order to transmit the handover request and information necessary for the handover to the Target NE.

Upon receiving the handover request, the Target NE receives a handover command (Handover) including measurement settings (Measurement Configuration), mobility control information (Mobility Control Information), radio resource settings (Radio Resource Configuration), security settings (Security Configuration), and the like. Command) and send the handover command to Source NE. When the Source NE receives the handover command from the Target NE, the Source NE transmits the handover command to the terminal (UE). At this time, the Source NE transmits downlink radio resource allocation (DL Allocation) to the terminal. In addition, among the sequence numbers (Sequence Number: SN) of data packets that have not yet been sent to the terminal, the Source NE transfers the SN of the data packet that is transmitted to the terminal first to the Target NE, and the data that is sent to the terminal is also Target Transfer to NE.

The terminal uses the random access means (Random Access procedure) to synchronize with the Target NE and sends a handover complete message (RRC Connection Reconfiguration Complete) to the Target NE to complete the handover. As described above, the connected terminal can switch the connection destination from the connection destination wireless communication device to another wireless communication device without communication interruption.

Measurement settings (MeasConfig: Measurement Configuration) are the measurement target (MeasObject: Measurement Object), report setting (Report Config: Report Configuration), measurement identifier (MeasId: Measurement Identifier), and measurement result report (MR) filtering parameters (QuantityConfig) : Quantity Configuration), Measurement gap indicating the period during which data for measuring other frequencies and other systems is not transmitted / received, and the threshold (S-measure) of the primary cell that is required to start measurement of neighboring cells The The measurement setting is included in “RRC Connection Reconfiguration” sent from the Source NE to the terminal. Among them, the measurement identifier (MeasID), the measurement target (MeasObject), and the report setting (ReportConfig) perform a cooperative operation.

FIG. 19 is a diagram showing an example of the data configuration of the measurement setting (MeasConfig). As shown in FIG. 19, the measurement identifier (MeasID) indicates a combination of “MeasObjectID” that is an identifier indicating a measurement target (MeasObject) and “ReportConfigID” that is an identifier indicating a report setting (ReportConfig). It is an identifier for identifying a combination of a measurement target to be measured by the terminal and a report setting.

FIG. 20 is a diagram illustrating an example of a measurement target (MeasObject). As shown in FIG. 20, the measurement target (MeasObject) includes a carrier frequency to be measured (carrierFreq), a bandwidth to be measured (allowedMeasBandwidth), presence / absence of use of antenna port 1 of a neighboring cell (presenceAntennaPort1), frequency offset (OffsetFreq), Deletion list from neighboring cell list (cellsToRemoveList), Addition modification list to neighboring cell (cellsToAddModifyList), Deletion list from blacklist cell list (blackcCellsToRemoveList), Addition modification list to blacklist cell (blackCellsToAddModifyList), and CGI (Cell It consists of PCI instruction (cellForWhichToReportCGI) of the cell that requests acquisition of Global Id) and CSG Id (Closed Subscriber Group Id).

FIG. 21 is a diagram showing an example of a report setting (ReportConfig). As shown in FIG. 21, the report setting (ReportConfig) includes a trigger type (TriggerType) of the measurement result report (MR), “TriggerQuantity” indicating the quality (RSRQ or RSRP) used for the trigger, and the quality to be reported (trigger and “ReportQuantity” indicating the same or both), the maximum number of cells to report (MaxReportCells), the reporting period (ReportInterval), the number of reports (ReportAmount), and the like.

There are three types of measurement result reports (MR): one sent when an event occurs (event trigger reporting), one sent periodically (periodic reporting), and one sent periodically after an event occurs (event trigger periodic reporting) To do.

There are six types of events (Event A1 to Event A6) in the network of E-UTRAN (Evolved Universal Terrestrial Radio Access Network). “Event A1” is an event that reports a measurement result report (MR) when the quality of the serving cell is higher than a threshold value. “Event A2” is an event that reports a measurement result report (MR) when the quality of the serving cell is lower than the threshold. “Event A3” indicates that the quality of the neighboring cell is the primary cell (the primary cell is one of the serving cells, the frequency cell used at the time of initial connection establishment or connection re-establishment, or the cell indicated at the time of handover It is an event that reports a measurement result report (MR) when it is higher than the quality. “Event A4” is an event that reports a measurement result report (MR) when the quality of neighboring cells is higher than a threshold value. “Event A5” is an event for reporting a measurement result report (MR) when the quality of the primary cell is lower than the threshold 1 and the quality of the neighboring cell is higher than the threshold 2. “Event A6” reports a measurement result when the quality of the neighboring cell is higher than the quality of the secondary cell (the secondary cell is one of the serving cells and is set by the wireless communication device) (MR ) Is an event that reports.

There are two types of events outside the E-UTRAN network (Event2B1 and Event B2). “Event B1” is an event that reports a measurement result report (MR) when the quality of the neighboring cell of the neighboring Inter-RAT is higher than the threshold value. “Event B2” is an event for reporting a measurement result report (MR) when the quality of the primary cell is lower than the threshold 1 and the quality of the neighboring cell of Inter-RAT is higher than the threshold 2.

FIG. 22 is a diagram showing an example of a measurement result report (MR). As shown in FIG. 22, the measurement result report (MR) includes information on a measurement identifier (MeasID), RSRP and RSRQ of a primary cell, and neighbor cells (Neighbour 情報 Cell). The neighbor cell information includes a physical cell identifier (Physical Cell Identity: PCI), and optionally a global cell identifier (Global Cell Identity: CGI), a tracking area code (Tracking Area Code), a PLMN identifier list (Public Land Mobile Mobile Network) Identity List: PLMN List), RSRP, RSRQ, and CSG information. When there are a plurality of neighboring cells, information on a plurality of neighboring cells is included. The neighbor cell information further includes “LocationInfo” indicating location information, RSRP and RSRQ of the serving cell at the time of carrier aggregation, and RSRP and RSRQ of the best cell of the serving frequency. The terminal performs the measurement indicated by the measurement identifier (MeasID) and sends a measurement result report (MR) to the base station. Based on the measurement result report (MR), the base station decides whether or not to perform handover, and to which cell to perform handover, and starts the procedure when performing handover To do.

In the LTE-A system, introduction of “Coordinated Multiple Multiple Point (CoMP)” technology in which a plurality of wireless communication apparatuses perform multi-point cooperation for one terminal and transmit a wireless signal to the terminal is being studied. FIG. 23A and FIG. 23B are diagrams illustrating an example of multi-point cooperation (CoMP).

FIG. 23A shows an example of a JT (Joint Transmission) method which is one of CoMP technologies. As described in Non-Patent Document 1, in the JT system, a terminal is connected to one wireless communication device, and a signal transmitted from the wireless communication device in a downlink control channel (Physical Downlink Control Channel: PDCCH) region is transmitted to the terminal. Receive. Also, the terminal receives signals transmitted in the downlink shared channel (Physical Downlink Shared Channel: PDSCH) region from a plurality of wireless communication devices. A plurality of wireless communication apparatuses transmit the same data so as to be in phase with respect to the same resource block (Resource Block: RB). For this reason, the terminal can synthesize radio waves transmitted from a plurality of wireless communication devices to increase received power. As a result, an improvement in communication speed is expected.

FIG. 23B shows an example of a DCS (Dynamic Cell Selection) method which is one of CoMP technologies. Even in the DCS scheme, a terminal connects to one wireless communication apparatus, and the terminal receives a signal transmitted from the wireless communication apparatus in the PDCCH region. Further, the terminal receives a signal transmitted in the PDSCH region from one of a plurality of cooperative wireless communication apparatuses. In this way, by selecting and using a wireless communication device having a good reception environment from among a plurality of wireless communication devices, the terminal can receive signals in a better reception environment. Furthermore, when one wireless communication device transmits data to a resource block (RB), interference occurs when the cooperating wireless communication device mutes (does not transmit radio waves) to that RB. The power can be lowered. As a result, an improvement in communication speed is expected.

As described above, signal reception characteristics can be improved by using the CoMP technology. In the following description, the improvement in reception characteristics at the terminal when the technology is used compared to when the CoMP technology is not used is referred to as “CoMP gain”. That is, the “CoMP gain” is a parameter indicating the difference between the reception quality of the downlink control channel (PDCCH) and the reception quality of the downlink shared channel (PDSCH) when using CoMP.

Conventionally, in mobility control, a terminal measures the received power of its own cell using a cell reference signal (Cell CRS) in a cell (own cell) to which the terminal is connected. However, CRS is a reference signal sent on both PDCCH and PDSCH, and CRS sent on PDSCH is not sent in cooperation with other cells, so when using PDCCH reception quality and CoMP Since a CoMP gain, which is a difference in PDSCH reception quality, is not considered, a cell suitable for the terminal is not selected. Therefore, movement control in consideration of the CoMP gain is necessary.

An object of the present invention is to provide a radio communication terminal, a radio communication apparatus, a radio communication system, and a measurement method that can appropriately perform measurement of the own cell in consideration of the CoMP gain when the radio communication terminal performs mobility control. Is to provide.

The present invention is the wireless communication terminal used in a wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination and transmit a wireless signal to the wireless communication terminal, from the wireless communication device to the wireless communication terminal A receiving unit that receives a connection reset message transmitted to a radio communication terminal, the connection reset message includes a measurement setting that includes a CoMP gain consideration flag indicating whether or not to consider a CoMP gain, and the radio communication terminal A reference signal necessary for performing measurement in consideration of CoMP gain, and performing measurement in consideration of the CoMP gain based on the state of the CoMP gain consideration flag included in the connection reconfiguration message. A CoMP gain consideration determination unit that determines whether or not the CoMP gain consideration determination unit performs measurement in consideration of the CoMP gain If determined, at least one wireless communication apparatus that performs multipoint coordination with the wireless communication terminal using the reference signal received and processed according to the setting of the reference signal included in the connection reconfiguration message. A radio communication terminal comprising: a measurement unit that performs measurement in consideration of the CoMP gain for a communication cell; and a measurement result report unit that reports a result of measurement by the measurement unit to the radio communication device. I will provide a.

The present invention is the wireless communication device used in a wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination with respect to one wireless communication terminal and transmit a wireless signal to the wireless communication terminal. The wireless communication apparatus includes a measurement setting including a CoMP gain consideration flag indicating whether or not to consider a CoMP gain, and a reference signal setting required when the wireless communication terminal performs measurement considering the CoMP gain, There is provided a wireless communication apparatus for transmitting a connection reset message having the following information to the wireless communication terminal.

The present invention is a wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination and transmit a wireless signal to the wireless communication terminal, wherein the wireless communication device considers CoMP gain? A connection reconfiguration message having a measurement setting including a CoMP gain consideration flag indicating whether or not and a reference signal setting required when the wireless communication terminal performs measurement in consideration of the CoMP gain is transmitted to the wireless communication terminal Whether or not the wireless communication terminal performs the measurement considering the CoMP gain based on the state of the reception unit receiving the connection reset message and the CoMP gain consideration flag included in the connection reset message. And a CoMP gain consideration determination unit that determines whether to perform measurement in consideration of the CoMP gain. And at least one communication cell provided by a wireless communication device group that performs multipoint coordination with the wireless communication terminal using a reference signal received and processed according to the setting of the reference signal included in the connection reconfiguration message There is provided a wireless communication system comprising: a measurement unit that performs measurement in consideration of the CoMP gain; and a measurement result report unit that reports a result measured by the measurement unit to the wireless communication device.

The present invention is a method of measuring a wireless communication terminal in a wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination and transmit a wireless signal to the wireless communication terminal, The received connection reconfiguration message is received, and the connection reconfiguration message includes a measurement setting including a CoMP gain consideration flag indicating whether or not to consider a CoMP gain, and a measurement in which the wireless communication terminal considers the CoMP gain. Determining whether or not to perform the measurement considering the CoMP gain based on the state of the CoMP gain consideration flag included in the connection reconfiguration message. When it is determined that the measurement considering the CoMP gain is performed, reception is performed according to the setting of the reference signal included in the connection reconfiguration message. Using the reference signals sense, to provide a measurement method for performing measurement in consideration of the CoMP gain for at least one communication cell to a wireless communication device provides for performing a multipoint coordinated to the radio communication terminal.

According to the wireless communication terminal, the wireless communication apparatus, the wireless communication system, and the measurement method according to the present invention, when the wireless communication terminal performs mobility control, the own cell is appropriately measured in consideration of the CoMP gain. Can do.

Timing chart when a terminal creates a measurement result report in the wireless communication system of the first embodiment Block diagram of a terminal constituting the wireless communication system of the first embodiment 1 is a block diagram of a wireless communication device that constitutes a wireless communication system according to a first embodiment; The flowchart which shows an example of operation | movement of the terminal of 1st Embodiment. Block diagram of a terminal constituting the wireless communication system of the second embodiment The flowchart which shows an example of operation | movement of the terminal of 2nd Embodiment. Block diagram of a terminal constituting the wireless communication system of the third embodiment The flowchart which shows an example of operation | movement of the terminal of 3rd Embodiment. Timing chart when a terminal creates a measurement result report in the wireless communication system of the fourth embodiment The figure which shows an example of the setting of PCI of the cell which comprises the CoMP set in 4th Embodiment. Block diagram of a terminal constituting the wireless communication system of the fourth embodiment Block diagram of a wireless communication apparatus constituting the wireless communication system of the fourth embodiment The flowchart which shows an example of operation | movement of the terminal of 4th Embodiment. A block diagram showing a terminal which constitutes a radio communications system of a 5th embodiment. The flowchart which shows an example of operation | movement of the terminal of 5th Embodiment. Explanatory drawing of an example of the radio | wireless communications system of 7th Embodiment Explanatory drawing of an example of the radio | wireless communications system of other embodiment Sequence diagram showing an example of handover Diagram showing an example of the data configuration of measurement settings (MeasConfig) Diagram showing an example of a measurement target (MeasObject) Diagram showing an example of report settings (ReportConfig) Figure showing an example of a measurement result report (Measurement Report) (A) is a figure which shows the example of the JT system of CoMP, (b) is a figure which shows the example of the DCS system of CoMP.

Embodiments of a wireless communication system according to the present invention will be described in detail with reference to the drawings. A wireless communication system according to an embodiment described below includes at least one wireless communication terminal and at least one wireless communication apparatus that can communicate with the wireless communication terminal via a wireless communication network. In the following description, the wireless communication terminal is simply referred to as “terminal”. The terminal is, for example, a mobile phone. The wireless communication device is wirelessly connected to a wireless communication base station (eNB), an extended base station (Remote Radio Head: RRH) installed in an area away from the wireless communication base station, a wireless communication base station, and the like. A device that is a generic term for a relay device (relay node or repeater), a femto base station, and the like, and that allows a terminal to connect wirelessly. The overhang base station (RRH) has the same function as the radio unit (Radio-Frequency unit: RF unit) of the radio communication base station (eNB), and is connected to the control unit of the radio communication base station with a wired cable. Yes.

The wireless communication system uses LTE or LTE-A mobile communication technology standardized by 3GPP (The 3rd Generation Generation Partnership Project). However, the mobile communication technology used by the wireless communication system is not limited to the above standards, and WiMAX (Worldwide Interoperability for Microwave Access) such as wireless LAN (Wireless Local Area Network), IEEE802.16, IEEE802.16e, IEEE802.16m, It may be 3GPP2, SAE (System Architecture Evolution), UMTS (Universal Mobile Telecommunications System), or the fourth generation mobile communication standard.

Each wireless communication device constitutes at least one communication cell. A communication cell refers to a radio network object that a terminal can uniquely identify based on an identifier assigned to a geographical area or a difference in frequency used in the geographical area. In the following description, a communication cell is simply referred to as a “cell”. One radio communication apparatus constitutes one or more cells for each of one or more carrier frequencies. In addition, the said structure is a basic concept and a radio | wireless communication apparatus may comprise one cell in cooperation with another radio | wireless communication apparatus. Further, the terminal communicates using at least one communication cell configured by the wireless communication device.

多 CoordinatedCoMultiple Point (CoMP) is a technology that improves the throughput of a terminal when a plurality of wireless communication devices operate in cooperation. A plurality of wireless communication devices constitute separate cells, and a terminal is a cell (own cell) formed by one wireless communication device in a CoMP set (a group of wireless communication devices operating in cooperation with one terminal). Connect to. The terminal receives a downlink control channel (Physical Downlink Control Channel: PDCCH) from its own cell, and transmits a data packet addressed to the terminal to be transmitted in cooperation by the CoMP set wireless communication apparatuses (Physical Downlink Shared Channel: PDSCH). ).

Hereinafter, the wireless communication systems of the first to seventh embodiments will be described in order. In the first to seventh embodiments, components having the same function are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
The wireless communication system according to the first embodiment will be described with reference to FIGS. The wireless communication system according to the first embodiment includes the terminal and the wireless communication device described above. The terminal has a function of receiving a reference signal transmitted from the wireless communication apparatus for each cell in the downlink and reporting a measurement result derived based on a predetermined calculation formula to the wireless communication apparatus. In addition, the wireless communication apparatus assigns and manages wireless resources (for example, frequency bands in the frequency domain or time domain) to each terminal. Further, the wireless communication apparatus has a function of performing a handover process when it is determined that a handover to another cell is necessary based on a measurement result report from the terminal, and serves as an access point of a radio access network for the terminal. Have.

FIG. 1 is a timing chart when a terminal creates a measurement result report in the wireless communication system of the first embodiment. As illustrated in FIG. 1, the wireless communication device to which the terminal is connected transmits an RRC connection reconfiguration message (RRC Connection Reconfiguration) to the terminal. The RRC connection reconfiguration message includes channel status information reference signal (Channel State Information Reference Signal: CSI-RS) setting (CSI-RS Configuration), CoMP type (CoMP Type), and measurement configuration (Measurement Configuration: MC). Including. Note that the measurement setting (MC) includes a flag (CoMP gain consideration flag) that is set when measurement is performed in consideration of the CoMP gain.

When the terminal receives the RRC connection reconfiguration message from the wireless communication device, the terminal transmits an RRC connection reconfiguration completion message (RRC Connection Reconfiguration Complete) to the wireless communication device. Further, the terminal performs measurement (Measurement) based on an RRC connection reconfiguration message (RRC Connection Reconfiguration) from the wireless communication device, and transmits a measurement result report (MR) to the wireless communication device. This is only an example, and other message configurations may be used. For example, necessary information may be transmitted from the wireless communication apparatus to the terminal by combining the broadcast information and the individual control information.

[Configuration of Terminal of First Embodiment]
FIG. 2 is a block diagram of terminals constituting the wireless communication system according to the first embodiment. As illustrated in FIG. 2, the terminal according to the first embodiment includes a reception unit 101, a control unit 103, and a transmission unit 105. The control unit 103 includes a CoMP gain consideration determination unit 111, a CoMP type determination unit 113, a measurement management unit 115, an event determination unit 117, and a measurement result report creation unit 119. In addition, the measurement management unit 115 includes an adjacent cell measurement unit 121, a normal measurement unit 123, a JT measurement unit 125, and a DCS measurement unit 127.

In response to an instruction from the control unit 103, the reception unit 101 receives broadcast information, individual control information, and the like via the downlink of the cell being used by the terminal. The receiving unit 101 outputs the received notification information, individual control information, and the like to the control unit 103.

In response to an instruction from the normal measurement unit 123 included in the measurement management unit 115 of the control unit 103, the reception unit 101 receives a cell reference signal (Cell Reference Signal: CRS), a received signal strength (Received Signal Signal Strength: RSSI), and the like. Receive. The receiving unit 101 outputs the received CRS, RSSI, and the like to the normal measurement unit 123. The receiving unit 101 receives a channel state information reference signal (Channel （State Information Reference signal (CSI-RS), RSSI, and the like) in response to an instruction from the JT measurement unit 125 included in the measurement management unit 115 of the control unit 103. The reception unit 101 outputs the received CSI-RS, RSSI, etc. to the JT measurement unit 125. The reception unit 101 also responds to an instruction from the DCS measurement unit 127 included in the measurement management unit 115 of the control unit 103. The reception unit 101 outputs the received CSI-RS, RSSI, etc. to the DCS measurement unit 127. The reception unit 101 is included in the measurement management unit 115 of the control unit 103. CRS, RSSI, etc. are received according to the instruction | indication from the adjacent cell measurement part 121. The receiving part 101 receives the received CRS and RSSI in an adjacent cell. Output to the measurement unit 121.

The control unit 103 uses information held by the terminal, broadcast information, individual control information, and the like to consider information for CoMP gain, CSI-RS setting, CRS setting, RSSI setting, layer 3 filtering setting, measurement setting ( Measurement Configuration: MC), PCI (Physical Cell ID) of own cell, frequency of own cell, and the like are output to CoMP gain consideration determination section 111. Note that the measurement setting (MC) may include some information, for example, information for considering the CoMP gain. The control unit 103 outputs the measurement setting (MC) to the measurement management unit 115 and the event determination unit 117. The control unit 103 outputs a response message or measurement result report for the individual control information to the transmission unit 105.

The CoMP gain consideration determination unit 111 determines whether or not to perform measurement of the own cell in consideration of the CoMP gain based on instruction information on whether or not to consider the CoMP gain. The instruction information on whether or not to consider the CoMP gain is, for example, a 1-bit CoMP gain consideration flag included in the measurement setting in the RRC connection reconfiguration message (RRC Connection Reconfiguration) transmitted from the wireless communication device. . At this time, if a 1-bit CoMP gain consideration flag is included, the CoMP gain consideration determination unit 111 determines that the measurement of the own cell is performed in consideration of the CoMP gain in all measurements. The instruction information as to whether or not to consider the CoMP gain may be a 1-bit CoMP gain consideration flag included for each measurement identifier. In this case, the CoMP gain consideration determination unit 111 considers the CoMP gain for each measurement identifier. It is determined whether or not to perform the measurement. The instruction information as to whether or not to consider the CoMP gain may be a 1-bit CoMP gain consideration flag included for each measurement target. In this case, the CoMP gain consideration determination unit 111 considers the CoMP gain for each measurement identifier. It is determined whether or not to perform the measurement. The instruction information as to whether or not to consider the CoMP gain may be a 1-bit CoMP gain consideration flag included for each report setting. In this case, the CoMP gain consideration determination unit 111 considers the CoMP gain for each measurement identifier. It is determined whether or not to perform the measurement.

If the CoMP gain consideration determining unit 111 determines to perform measurement without considering the CoMP gain, the own cell frequency, the own cell PCI (Physical Cell ID), the CRS setting, the RSSI setting, the layer 3 filtering setting, etc. Settings necessary for measurement are output to the normal measurement unit 123. On the other hand, if the CoMP gain consideration determining unit 111 determines to perform measurement in consideration of the CoMP gain, the type of CoMP, the frequency of the own cell, the PCI of the own cell, the CSI-RS setting, the RSSI setting, the layer 3 filtering setting, and the measurement Settings necessary for the measurement of the own cell such as settings (MC) are output to the CoMP type determination unit 113. Note that the CoMP gain consideration determination unit 111 also determines the own cell frequency such as the own cell frequency, the own cell PCI, the CRS setting, the RSSI setting, and the layer 3 filtering setting even when it is determined that the measurement considering the CoMP gain is performed. Settings necessary for measurement are output to the normal measurement unit 123.

When determining that the CoMP type is JT (Joint で Transmission) based on the CoMP type input from the CoMP gain consideration determination unit 111, the CoMP type determination unit 113 determines the frequency of the own cell, the PCI of the own cell, Settings necessary for the measurement of the own cell such as layer 3 filtering setting, CSI-RS setting, RSSI setting, and the like are output to the JT measurement unit 125. On the other hand, if the CoMP type determination unit 113 determines that the type of CoMP is a DCS (Dynamic Cell Selection) system, the frequency of the own cell, the PCI of the own cell, the layer 3 filtering setting, and the CSI- for each cell in the CoMP set. Settings necessary for measurement of the own cell such as RS settings and RSSI settings are output to the DCS measurement unit 127.

The measurement management unit 115 separately manages RSRP and RSRQ of its own cell, RSRP and RSRQ using normal CRS, and RSRP and RSRQ considering CoMP gain. The measurement management unit 115 manages the RSRP input from the normal measurement unit 123 as an RSRP using a normal CRS, and manages the RSRP input from the JT measurement unit 125 or the DCS measurement unit 127 as an RSRP considering the CoMP gain. To do.

The measurement management unit 115 creates an RSRQ of its own cell using normal CRS by combining RSSI input from the normal measurement unit 123 with RSRP using normal CRS. Similarly, the measurement management unit 115 combines the RSSI input from the JT measurement unit 125 or the DCS measurement unit 127 with the RSRP considering the CoMP gain, thereby creating the RSRQ of the own cell considering the CoMP gain. Note that the measurement management unit 115 may create the RSRQ of the own cell considering the CoMP gain by combining the RSSI input from the normal measurement unit 123 with the RSRP considering the CoMP gain. Thus, the radio | wireless resource which measures electric power can be reduced by combining RSSI and RSRP and producing RSRQ. As a result, power consumption can be suppressed and the circuit scale can be reduced. When there are a plurality of own cells, the measurement management unit 115 separately manages RSRP and RSRQ using normal CRS for each cell, and RSRP and RSRQ considering the CoMP gain.

The measurement management unit 115 manages the RSRP and RSRQ for each cell input from the neighboring cell measurement unit 121. The measurement management unit 115 creates the RSRQ of the neighboring cell by combining the RSSI input from the neighboring cell measurement unit 121 with the RSRP of the neighboring cell. Note that the measurement management unit 115 may create the RSRQ of the adjacent cell by combining the RSSI input from the normal measurement unit 123 with the RSRP of the adjacent cell. Thus, the radio | wireless resource which measures electric power can be reduced by combining RSSI and RSRP and producing RSRQ. As a result, power consumption can be suppressed and the circuit scale can be reduced.

The measurement management unit 115 compares the RSRP input from the normal measurement unit 123 with the S-measure included in the measurement setting (MC) (the threshold value of the primary cell that is required to start measurement in the neighboring cell). When the RSRP of the own cell using normal CRS falls below S-measure, the measurement management unit 115 instructs the adjacent cell measurement unit 121 to start measurement of the adjacent cell. On the other hand, when the RSRP of the own cell using normal CRS exceeds the S-measure, the measurement management unit 115 instructs the adjacent cell measurement unit 121 to stop measuring the adjacent cell.

The measurement management unit 115 manages the values input from the normal measurement unit 123, the JT measurement unit 125, the DCS measurement unit 127, or the adjacent cell measurement unit 121 as described above, and the input value and PCI for each input. The frequency is output to the event determination unit 117. When the measurement management unit 115 receives an inquiry from the measurement result report creation unit 119 for a value (for example, RSRP or RSRQ of a specific cell) necessary for creation of the measurement result report (Measurement Report), the measurement management unit 115 manages The measured value is output to the measurement result report creation unit 119.

When the neighbor cell measurement unit 121 receives the neighbor cell measurement instruction from the measurement management unit 115, the neighbor cell measurement unit 121 instructs the reception unit 101 to measure the CRS and RSSI of the neighbor cell based on the measurement setting (MC). The neighboring cell measurement unit 121 outputs the result of layer 3 filtering of the CRS and RSSI values input from the reception unit 101 to the measurement management unit 115 together with the PCI and frequency. When the RSSI value of the adjacent cell is shared with the RSSI value of the own cell, the adjacent cell measurement unit 121 does not measure the RSSI of the adjacent cell.

The normal measurement unit 123 instructs the reception unit 101 to receive CRS and RSSI based on the information input from the CoMP gain consideration determination unit 111. The normal measurement unit 123 outputs the result of layer 3 filtering of the CRS and RSSI values input from the reception unit 101 to the measurement management unit 115 together with the PCI and frequency as the value of the own cell.

The JT measurement unit 125 instructs the reception unit 101 to receive CSI-RS and RSSI that are common among CoMP sets using the settings input from the CoMP gain consideration determination unit 111. The JT measurement unit 125 outputs the result of layer 3 filtering of the CSI-RS and RSSI values input from the reception unit 101 to the measurement management unit 115 together with the PCI and frequency as the value of its own cell. Note that the JT measurement unit 125 measures RSSI using the same resource block as the resource block for measuring CSI-RS. In addition, when the JT measurement unit 125 calculates the RSRQ considering the CoMP gain based on the RSSI input from the normal measurement unit 123, the JT measurement unit 125 does not instruct the measurement of the RSSI.

In the case of the JT method, since data is simultaneously received from the cells of the CoMP set, the same quality as the data can be measured by simultaneously receiving the CSI-RS from the cells of the CoMP set. Therefore, by using a common scrambling code (eg, common PCI) between CoMP set cells, the CoMP set cells send CSI-RSs to the same resource block, so that on the terminal side, the same as the data Quality can be measured. As a result, appropriate MCS (Modulation Code Scheme) can be derived and appropriate movement control can be performed, and the communication speed can be improved.

The DCS measurement unit 127 instructs the reception unit 101 to receive the CSI-RS and the RSSI for each cell of the CoMP set using the setting input from the CoMP gain consideration determination unit 111. The DCS measurement unit 127 compares the CSI-RS input from the reception unit 101 for each cell, and sets a larger value as the value of the own cell. The DCS measurement unit 127 outputs, to the measurement management unit 115, the result of layer 3 filtering the RSSI measured together with the CSI-RS set as the value of the own cell, together with the PCI and the frequency. Note that the DCS measurement unit 127 does not instruct the measurement of RSSI when calculating RSRQ considering the CoMP gain based on the RSSI input from the normal measurement unit 123.

In the case of the DCS method, in order to measure CSI-RS for each cell of the CoMP set, a scrambling code for each cell (for example, PCI of each cell) is used, and CSI- By sending the RS, the quality of each cell can be measured on the terminal side. As a result, an appropriate cell can be selected and the communication speed can be improved.

The event determination unit 117 performs event determination based on the value input from the measurement management unit 115 according to the measurement setting (MC). When the event determination unit 117 determines that the criterion for creating the measurement result report (MR) is satisfied, the event determination unit 117 outputs the measurement result of the cell used for the event determination to the measurement result report creation unit 119.

The measurement result report creation unit 119 creates a measurement result report (MR) including measurement values obtained from at least one measurement unit included in the measurement management unit 115 and outputs the measurement result report (MR) to the control unit 103. When the measurement result report creation unit 119 determines that the value necessary for creating the measurement result report is insufficient, the measurement result report creation unit 119 inquires the measurement management unit 115 about the necessary value. In this case, when the measurement result report creation unit 119 obtains a necessary value, the measurement result report creation unit 119 creates a measurement result report reflecting the obtained value.

The transmission unit 105 transmits the measurement result report input from the control unit 103 to the wireless communication apparatus.

Note that the JT measurement unit 125 and the DCS measurement unit 127 may perform RSSI measurement simultaneously with CSI-RS measurement. That is, the JT measurement unit 125 and the DCS measurement unit 127 measure RSSI using the same resource block as the resource block for measuring CSI-RS. By doing so, since the CSI-RS value that accurately represents the CoMP gain can be used, the RSSI can be measured accurately. In addition, if RSSI is measured with an OFDM symbol that measures CSI-RS, it can be averaged within the OFDM symbol, so that the influence of traffic of other wireless communication devices can be reduced.

Note that the measurement management unit 115 may use the RSRP of the own cell in consideration of the CoMP gain for comparison with the S-measure. Further, notification may be made with 1 bit in the measurement setting. Further, when measurement of all own cells is performed in consideration of the CoMP gain, the RSRP of the own cell considering the CoMP gain may be used.

[Configuration of Wireless Communication Device of First Embodiment]
FIG. 3 is a block diagram of a wireless communication device constituting the wireless communication system according to the first embodiment. As illustrated in FIG. 3, the wireless communication apparatus according to the first embodiment includes a wireless reception unit 151, a network reception unit 153, a control unit 155, a network transmission unit 157, and a wireless transmission unit 159. . The control unit 155 includes a CSI-RS creation unit 161 and a measurement setting creation unit 163. The measurement setting creation unit 163 includes a CoMP gain measurement setting creation unit 171 and a normal measurement setting creation unit 173.

The wireless reception unit 151 receives a response message to the measurement result report or the individual control information transmitted from the terminal and outputs the response message to the control unit 155.

When the network reception unit 153 receives information necessary for CSI-RS creation or CSI-RS settings from another wireless communication device or network device, the network reception unit 153 outputs the information to the CSI-RS creation unit 161. Further, when receiving the control information, the network receiving unit 153 outputs the control information to the control unit 155.

The control unit 155 instructs the CSI-RS creation unit 161 to create a scrambled CSI-RS using a common cell ID in the CoMP set when CoMP is operated in the JT format. In addition, when operating CoMP in the DCS scheme, the control unit 155 instructs the CSI-RS creating unit 161 to create a scrambled CSI-RS for each cell in the CoMP set using an individual cell ID.

The CSI-RS creation unit 161 creates a CSI-RS based on the information input from the network reception unit 153 in response to an instruction from the control unit 155 and outputs the CSI-RS to the control unit 155. When the necessary information is not input from the network receiving unit 153, the CSI-RS creating unit 161 outputs a request for information necessary for creating the CSI-RS to the network transmitting unit 157.

Further, the control unit 155 grasps the setting of the terminal from the response message for the individual control information. Further, the control unit 155 outputs CoMP operation information and neighboring cell information to the measurement setting creation unit 163.

When it is determined that the measurement considering the CoMP gain is performed, the measurement setting creation unit 163 instructs the CoMP gain measurement setting creation unit 171 to create the measurement setting considering the CoMP gain, and the CoMP gain measurement setting creation unit 171. The information of the own cell and the information of the neighboring cell are inputted into Further, when it is determined that the measurement without considering the CoMP gain is performed, the measurement setting creation unit 163 instructs the normal measurement setting creation unit 173 to create the measurement setting without considering the CoMP gain, and the normal measurement setting creation unit 173. The information of the own cell and the information of the neighboring cell are inputted into The measurement setting creation unit 163 collects the measurement settings input from the CoMP gain measurement setting creation unit 171 and the normal measurement setting creation unit 173 and outputs them to the control unit 155.

Based on the information input from the measurement setting creation unit 163, the CoMP gain measurement setting creation unit 171 creates a measurement setting (MC) including a 1-bit CoMP gain consideration flag indicating whether or not the measurement takes into account the CoMP gain. And output to the measurement setting creation unit 163. Whether or not the measurement takes the CoMP gain into consideration may include a 1-bit CoMP gain consideration flag for each measurement identifier, create a measurement setting (MC), and output the measurement setting to the measurement setting creation unit 163. Whether or not the measurement takes the CoMP gain into consideration may include a 1-bit CoMP gain consideration flag for each measurement target, create a measurement setting (MC), and output the measurement setting to the measurement setting creation unit 163. Whether or not the measurement takes the CoMP gain into consideration may include a 1-bit CoMP gain consideration flag for each report setting, create a measurement setting (MC), and output the measurement setting to the measurement setting creation unit 163.

The normal measurement setting creation unit 173 creates a measurement setting (MC) based on the information input from the measurement setting creation unit 163 and outputs the measurement setting (MC) to the measurement setting creation unit 163.

The control unit 155 outputs individual control information including CSI-RS settings, CoMP types, and measurement settings (MC) to the transmission unit 105. In addition, the control unit 155 determines the movement control of the terminal based on the measurement result report (MR) received by the wireless reception unit 151.

The network transmission unit 157 transmits a request for information necessary to create the CSI-RS output from the CSI-RS creation unit 161 to another wireless communication device or network device. The network transmission unit 157 transmits information output from the control unit 155 to another wireless communication device or network device.

The wireless transmission unit 159 transmits the individual control information input from the control unit 155 to the terminal.

The control unit 155 creates a CSI-RS setting in cooperation with other wireless communication systems in the CoMP set.

Next, the operation of the terminal according to the first embodiment will be described. FIG. 4 is a flowchart illustrating an example of the operation of the terminal according to the first embodiment.

The terminal performs measurement of its own cell by CRS as in the past, and performs layer 3 filtering that averages the measured value in the time domain (step S101). Note that the terminal repeats the measurement of its own cell in step S101 as indicated by a dotted line in the figure. Next, the terminal compares RSRP based on the CRS of the own cell with S-measure (step S102). When the RSRP based on the CRS of the own cell is higher than the S-measure (in the case of No), the process proceeds to step S104. On the other hand, when the RSRP based on the CRS of the own cell is equal to or less than the S-measure (Yes), the process proceeds to step S103.

In step S103, the terminal performs measurement of neighboring cells (Measurement) and performs layer 3 filtering. The terminal repeats the measurement of the neighboring cell in step S103 until the RSRP based on the CRS of the own cell becomes higher than the S-measure, as indicated by a dotted line in the figure.

In step S104, the terminal performs measurement (Measurement) considering the CoMP gain based on the CoMP gain consideration flag included in the measurement setting (MC) in the RRC connection reconfiguration message (RRC Connection Reconfiguration) transmitted from the wireless communication device. ) Is determined. When it is determined that the measurement is performed without considering the CoMP gain (in the case of No), the process proceeds to step S108. On the other hand, when it is determined that the measurement considering the CoMP gain is performed (in the case of Yes), the process proceeds to step S105. In step S105, the terminal determines the type of CoMP based on information included in the RRC connection reconfiguration message (RRC Connection Reconfiguration). If the terminal determines that the type of CoMP is the JT method in step S105, the terminal proceeds to step S106. If the terminal determines that the type is the DCS method, the terminal proceeds to step S107.

In step S106, the terminal performs measurement of its own cell using CSI-RS common to the CoMP set, and performs layer 3 filtering using the measured value. In addition, while the measurement of step S106 is repeated as shown by a dotted line in the drawing, the process proceeds to step S108.

In step S107, the terminal performs measurement using individual CSI-RS for each cell configuring the CoMP set, and performs layer 3 filtering using the maximum measured value in the CoMP set as the value of the own cell. . While the measurement in step S107 is repeated as indicated by the dotted line in the figure, the process proceeds to step S108.

In step S108, the terminal determines an event (Measurement Event) using the layer 3 filtered value and the measurement setting (MC) (step S108). When the terminal satisfies an event for transmitting a measurement result report (Measurement Report), the terminal creates a measurement result report (Measurement Report) (Step S109) and transmits it to the wireless communication device (Step 110).

As described above, according to the present embodiment, since the terminal can perform measurement in consideration of the CoMP gain according to the type of CoMP to be used, an appropriate cell can be used when performing mobility control. Can be selected.

In step S104, the case where the CoMP gain consideration flag is indicated by 1 bit in the measurement setting is shown. However, when the CoMP gain consideration flag is included for each measurement identifier, for each measurement target, or for each report setting, the terminal Whether to consider the CoMP gain for each measurement identifier is determined.

Further, in step S107, it has been described that the layer 3 filtering is performed using the maximum measurement value in the CoMP set as the value of the own cell. However, in this step, the terminal measures the measurement value of each cell constituting the CoMP set. May be subjected to layer 3 filtering, and the value of the largest cell among the values after layer 3 filtering may be input to step S108 as the value of the own cell.

Note that the measurement of the adjacent cell (Measurement) may be the same as or different from the conventional measurement (Measurement).

(Second Embodiment)
A wireless communication system according to the second embodiment will be described with reference to FIGS. In the wireless communication system of the present embodiment, conditions for performing measurement in consideration of the CoMP gain are different from those of the first embodiment. Therefore, in the wireless communication system of the second embodiment, the operation of some components of the terminal is different from that of the first embodiment. Except for this point, the second embodiment is the same as the first embodiment. In FIGS. 5 and 6, the same reference numerals are assigned to components or steps that are common to the corresponding drawings in the first embodiment.

[Configuration of Terminal of Second Embodiment]
FIG. 5 is a block diagram of terminals constituting the wireless communication system according to the second embodiment. As illustrated in FIG. 5, the terminal according to the second embodiment includes a reception unit 101, a control unit 203, and a transmission unit 105. The terminal of this embodiment is different from the terminal of the first embodiment in a measurement management unit 215, a JT measurement unit 225, and a DCS measurement unit 227 included in the control unit 203.

The measurement management unit 215 compares the RSRP input from the normal measurement unit 123 with the S-measure included in the measurement setting (MC), in addition to the functions of the measurement management unit 115 of the first embodiment. When the RSRP input from the normal measurement unit 123 falls below the S-measure, the measurement management unit 215 instructs the JT measurement unit 225 and the DCS measurement unit 227 to start CSI-RS and RSSI measurement. On the other hand, when the RSRP input from the normal measurement unit 123 exceeds the S-measure, the measurement management unit 215 instructs the JT measurement unit 225 and the DCS measurement unit 227 to stop CSI-RS and RSSI measurement.

The JT measurement unit 225 is instructed by the measurement management unit 215 to start measurement of CSI-RS and RSSI, and performs CoMP using the settings input from the CoMP gain consideration determination unit 111 until the measurement is instructed to stop. The reception unit 101 is instructed to receive CSI-RS and RSSI that are common between sets. The JT measurement unit 225 outputs the result of layer 3 filtering of the CSI-RS and RSSI values input from the reception unit 101 to the measurement management unit 215 as the value of its own cell together with the PCI and frequency. Note that the JT measurement unit 225 measures RSSI using the same resource block as the resource block for measuring CSI-RS. In addition, when the JT measurement unit 225 calculates the RSRQ considering the CoMP gain based on the RSSI input from the normal measurement unit 123, the JT measurement unit 225 does not instruct the measurement of the RSSI.

The DCS measurement unit 227 is instructed by the measurement management unit 215 to start measurement of CSI-RS and RSSI, and performs CoMP using the settings input from the CoMP gain consideration determination unit 111 during the period until the measurement is instructed. The reception unit 101 is instructed to receive the CSI-RS and the RSSI for each cell in the set. The DCS measurement unit 227 compares the CSI-RS input from the reception unit 101 for each cell, and sets a large value as the value of the own cell. The DCS measurement unit 227 outputs, to the measurement management unit 215, the result of layer 3 filtering the RSSI measured together with the CSI-RS as the value of the own cell together with the PCI and the frequency. Note that the DCS measurement unit 227 does not instruct the measurement of RSSI when calculating RSRQ considering the CoMP gain based on the RSSI input from the normal measurement unit 123.

Next, the operation of the terminal according to the second embodiment will be described. FIG. 6 is a flowchart illustrating an example of the operation of the terminal according to the second embodiment. In the flowchart shown in FIG. 6, steps S201 and S203 are added to the flowchart of the first embodiment shown in FIG. In FIG. 6, steps that are the same as those in FIG. 4 are denoted by the same reference numerals, and description thereof is simplified or omitted.

If the terminal determines in step S105 that the CoMP type is JT, the process proceeds to step S201. In step S201, the measurement management unit 215 compares the measured value of the CRS of the own cell after layer 3 filtering with the S-measure. In addition, the measured value of CRS of the own cell is a value that does not consider the CoMP gain. When the value of the CRS measurement value of the own cell after layer 3 filtering is higher than S-measure (in the case of No), the process proceeds to step S108. On the other hand, if the value after layer 3 filtering of the CRS measurement value of the own cell is equal to or less than S-measure (if Yes), the terminal proceeds to step S106, and the terminal uses its common CSI-RS in the CoMP set. Measurement is performed, and layer 3 filtering is performed using the measured value. Note that the terminal repeats the measurement in step S106 until the value after layer 3 filtering of the CRS measurement value of its own cell becomes higher than S-measure, as indicated by the dotted line in the figure, while proceeding to step S108. Transition.

If the terminal determines that the type of CoMP is the DCS method in step S105, the process proceeds to step S203. In step S203, the measurement management unit 215 compares the S-measure with the value after layer 3 filtering of the CRS measurement value of the own cell. In addition, the measured value of CRS of the own cell is a value that does not consider the CoMP gain. When the value of the CRS measurement value of the own cell after layer 3 filtering is higher than S-measure (in the case of No), the process proceeds to step S108. On the other hand, if the value after layer 3 filtering of the CRS measurement value of the own cell is equal to or less than S-measure (if Yes), the terminal proceeds to step S107, and the terminal performs individual CSI for each cell constituting the CoMP set. -Perform measurement using RS, and perform layer 3 filtering using the maximum measured value in the CoMP set as the value of its own cell. The terminal repeats the measurement in step S107 until the value after the layer 3 filtering of the CRS measurement value of the own cell becomes higher than the S-measure, as indicated by the dotted line in the figure, while proceeding to step S108. Transition.

As described above, in the present embodiment, even when the CoMP gain is taken into account, the value after the layer 3 filtering of the measured value of the CRS of the own cell that does not take the CoMP gain into consideration is greater than the S-measure. While it is high, the measurement considering the CoMP gain is not performed. For this reason, it is possible to shorten the period for performing measurement in consideration of the CoMP gain. The measurement value that does not consider the CoMP gain is generally higher than the measurement value that considers the CoMP gain. Generally, the movement control is not performed when the measurement value that does not consider the CoMP gain is higher than the S-measure. . Therefore, the power consumption accompanying movement control can be reduced.

(Third embodiment)
A wireless communication system according to the third embodiment will be described with reference to FIGS. In the wireless communication system according to the present embodiment, the reference for determining the measurement start of an adjacent cell is different from that in the first embodiment. Therefore, in the wireless communication system of the third embodiment, the operation of some components of the terminal is different from that of the first embodiment. Except for this point, the second embodiment is the same as the first embodiment. In FIGS. 7 and 8, the same reference numerals are assigned to components or steps that are common to the corresponding drawings in the first embodiment.

[Configuration of Terminal of Third Embodiment]
FIG. 7 is a block diagram of terminals constituting the wireless communication system according to the third embodiment. As illustrated in FIG. 7, the terminal according to the third embodiment includes a reception unit 101, a control unit 303, and a transmission unit 105. The terminal of this embodiment is different from the terminal of the first embodiment in a CoMP gain consideration determination unit 311 and a measurement management unit 315 that the control unit 303 has.

When the CoMP gain consideration determination unit 311 includes the CoMP gain consideration flag in one of the report settings associated with the measurement identifier, in addition to the function of the CoMP gain consideration determination unit 111 of the first embodiment, It has a function to notify the measurement management unit 315 of this.

The measurement management unit 315 is different from the operation of the measurement management unit 115 of the first embodiment in comparison with the S-measure. That is, the measurement management unit 315 of the present embodiment, when at least one of the report settings associated with the measurement identifier includes a CoMP gain consideration flag, is automatically input from the JT measurement unit 125 or the DCS measurement unit 127. Compare the RSRP of the cell with the S-measure. When the RSRP of the own cell input from the JT measurement unit 125 or the DCS measurement unit 127 falls below the S-measure, the measurement management unit 315 instructs the adjacent cell measurement unit 121 to start measurement of the adjacent cell. On the other hand, when the RSRP of the own cell input from the JT measurement unit 125 or the DCS measurement unit 127 exceeds the S-measure, the measurement management unit 315 instructs the adjacent cell measurement unit 121 to stop measuring the adjacent cell. Note that, when the CoMP gain consideration flag is not included in any of the report settings associated with the measurement identifier, the measurement management unit 315 performs RSRP of the own cell using normal CRS, as in the first embodiment. Compare S-measure.

Next, the operation of the terminal according to the third embodiment will be described. FIG. 8 is a flowchart illustrating an example of the operation of the terminal according to the third embodiment. In FIG. 8, steps common to those in FIG. 4 are denoted by the same reference numerals, and description thereof is simplified or omitted.

The terminal performs measurement of its own cell by CRS as in the past, and performs layer 3 filtering that averages the measured value in the time domain (step S101). Note that the terminal repeats the measurement of its own cell in step S101 as indicated by a dotted line in the figure. Next, the terminal determines, for each measurement identifier, whether or not to perform measurement in consideration of the CoMP gain (Step S301). When it is determined in step S301 that measurement is performed without considering the CoMP gain (in the case of No), the process proceeds to step S303. In step S303, the terminal determines whether or not a CoMP gain consideration flag is included in at least one of the report settings associated with the measurement identifier. If it is determined in step S303 that the CoMP gain consideration flag is included, the process proceeds to step S108. On the other hand, if it is determined in step S303 that the CoMP gain consideration flag is not included, the process proceeds to step S305.

If it is determined in step S301 that measurement considering the CoMP gain is performed (in the case of Yes), the process proceeds to S105. In step S105, the terminal determines the type of CoMP based on information included in the RRC connection reconfiguration message (RRC Connection Reconfiguration). If it is determined in step S105 that the CoMP type is the JT method, the process proceeds to step S106, the own cell is measured using the common CSI-RS in the CoMP set, and layer 3 filtering is performed using the measured value. I do. While the measurement in step S106 is repeated as indicated by the dotted line in the figure, the process proceeds to step S305.

If it is determined in step S105 that the type of CoMP is a DCS method, the process proceeds to step S107, and measurement is performed using individual CSI-RS for each cell constituting the CoMP set, and the maximum measured value in the CoMP set is measured. Is used as the value of its own cell to perform layer 3 filtering. While the measurement in step S107 is repeated as indicated by the dotted line in the figure, the process proceeds to step S305.

In step S305, the terminal compares the input RSRP of the own cell with the S-measure. When the RSRP of the own cell is higher than the S-measure (in the case of No), the process proceeds to step S108. On the other hand, when the RSRP of the own cell is equal to or less than S-measure (in the case of Yes), the process proceeds to step S307. In step S307, the terminal performs measurement of adjacent cells (Measurement) and performs layer 3 filtering. Note that the terminal repeats the measurement of the neighboring cell in step S307 until the RSRP of the own cell becomes higher than the S-measure, as indicated by a dotted line in the figure.

As described above, in the present embodiment, when the CoMP gain is considered, the measurement of the neighboring cell is not started unless the RSRP considering the CoMP gain of the own cell falls below the S-measure. Therefore, it is possible to measure the adjacent cell only at a more appropriate timing. Further, since the measurement of the neighboring cell is not started until the RSRP considering the CoMP gain of the own cell falls below the S-measure, the power consumption accompanying the measurement of the neighboring cell can be reduced.

(Fourth embodiment)
A wireless communication system according to the fourth embodiment will be described with reference to FIGS. In the radio communication system according to the present embodiment, the RRC connection reconfiguration message notified from the radio communication apparatus to the terminal does not include the CoMP type (CoMP Type), and the terminal estimates the CoMP type from other information. This is different from the embodiment. Except for this point, the second embodiment is the same as the first embodiment. In FIGS. 11 to 13, the same reference numerals are assigned to components or steps that are common to the corresponding drawings in the first embodiment.

FIG. 9 is a timing chart when the terminal creates a measurement result report in the wireless communication system according to the fourth embodiment. As illustrated in FIG. 9, the wireless communication device to which the terminal is connected transmits an RRC connection reconfiguration message (RRC Connection Reconfiguration) to the terminal. The RRC connection reconfiguration message includes a channel state information reference signal (Channel State Information Signal: CSI-RS) setting (CSI-RS configuration) and a measurement setting (Measurement Configuration: MC). Note that the measurement setting (MC) includes the CoMP gain consideration flag described in the first embodiment.

When the terminal receives the RRC connection reconfiguration message from the wireless communication device, the terminal transmits an RRC connection reconfiguration completion message (RRC Connection Reconfiguration Complete) to the wireless communication device. Further, the terminal performs measurement (Measurement) based on an RRC connection reconfiguration message (RRC Connection Reconfiguration) from the wireless communication device, and transmits a measurement result report (Measurement Report) to the wireless communication device.

FIG. 10 is a diagram illustrating an example of PCI settings of cells constituting a CoMP set according to the fourth embodiment. In the present embodiment, the cells of the CoMP set set the PCI so that the remainder when the value indicated by the PCI is divided by 3 is equal. In the following description, a remainder (remainder) value obtained by dividing a certain value by 3 is referred to as “modulo 3”. FIG. 10 shows an example in which a value obtained by modulo 3 of PCI is 1 when a CoMP set is configured with three cells. The network sets the PCI of the three cells to 1, 4, and 7 so that the value obtained by modulo 3 of the PCI is 1.

PCI (Physical Cell Signal) which is a cell ID in the physical layer of the network is obtained from two synchronization signals of PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal). The cell ID (N_ID (1)) in the cell group is obtained from the PSS, the cell group ID (N_ID (2)) is obtained from the SSS, and the PCI is obtained from the following equation (1).

PCI = 3 × N_ID (2) + N_ID (1) ... (1)

Therefore, the PCI included in the CSI-RS configuration (CSI-RS configuration) in the RRC connection reconfiguration message can be obtained by using modulo 3 only by making the cell IDs in the cell groups of the CoMP set cells equal. It is possible to determine whether the PCI is individually assigned to the cells in the CoMP set or the PCI for generating a common scrambling code between the cells of the CoMP set. That is, based on this determination, the terminal can determine whether the type of CoMP is the JT method or the DCS method.

According to the present embodiment, the CoMP type can be determined even if the CoRC type (CoMP Type) is not included in the RRC connection reconfiguration message notified from the wireless communication apparatus to the terminal. Expansion of message structure can be minimized. Also, management of CoMP sets by the network can be facilitated.

[Configuration of Terminal of Fourth Embodiment]
FIG. 11 is a block diagram of terminals constituting the wireless communication system according to the fourth embodiment. As illustrated in FIG. 11, the terminal according to the fourth embodiment includes a reception unit 101, a control unit 403, and a transmission unit 105. The terminal of this embodiment is different from the terminal of the first embodiment in a CoMP type determination unit 413 that the control unit 403 has.

The CoMP type determination unit 413 determines the CoMP type from the CSI-RS setting (CSI-RS configuration) input from the CoMP gain consideration determination unit 111. As described in the first embodiment, in the case of the JT method, CSI-RS measurement using a common PCI is performed in the cells constituting the CoMP set, and in the case of the DCS method, CSI-RS measurement using individual PCI is performed for the cell. For this reason, as illustrated in FIG. 10, the PCI of the cell is set so that the value obtained by modulo 3 of the PCI is the same between the cells of the CoMP set. However, in the case of the JT system, the value obtained by modulo 3 of the common PCI used for the CSI-RS scrambling code is set to be different from the value obtained by modulo 3 of the PCI of the CoMP set cell.

The CoMP type determination unit 413 includes a value obtained by modulo 3 of the PCI included in the CSI-RS setting (CSI-RS Configuration) input from the CoMP gain consideration determination unit 111 and a value obtained by modulo 3 of the PCI of the own cell. It is determined whether or not they are the same. When these two values are the same, the CoMP type determination unit 413 determines that the type of CoMP is DCS, and sets the frequency of the own cell, the PCI of the own cell, the layer 3 filtering setting, and the CSI for each cell in the CoMP set. -Settings necessary for measurement of the own cell, such as RS settings and RSSI settings, are output to the DCS measurement unit 127. On the other hand, if the above two values are different, the CoMP type determination unit 413 determines that the CoMP type is JT, and determines the frequency of the own cell, the PCI of the own cell, layer 3 filtering setting, CSI-RS setting, and RSSI. Settings necessary for measurement of the own cell such as settings are output to the JT measurement unit 125.

[Configuration of Wireless Communication Device of Fourth Embodiment]
FIG. 12 is a block diagram of a wireless communication device constituting the wireless communication system of the fourth embodiment. As illustrated in FIG. 12, the wireless communication apparatus according to the fourth embodiment includes a wireless reception unit 151, a network reception unit 153, a control unit 455, a network transmission unit 157, and a wireless transmission unit 159. . The difference between the wireless communication apparatus of the present embodiment and the wireless communication apparatus of the first embodiment is a control unit 455.

The control unit 455 has a function of adjusting the PCI of each cell so that the value obtained by modulo 3 of the PCI in the cells constituting the CoMP set becomes the same in addition to the function of the control unit 155 of the first embodiment. When the control unit 455 determines that the value obtained by modulating the PCI of the cell of the CoMP set is different from the value obtained by modulating the PCI of the own cell based on the control information input from the network receiving unit 153, The network transmission unit 157 is instructed to transmit a PCI update request for a CoMP set cell.

Next, the operation of the terminal according to the fourth embodiment will be described. FIG. 13 is a flowchart illustrating an example of the operation of the terminal according to the fourth embodiment. Note that step S405 is different from the flowchart of FIG. 4 described in the first embodiment.

In step S405, the terminal compares the value obtained by modulo 3 of the PCI included in the CSI-RS configuration (CSI-RS configuration) with the value obtained by modulo 3 of the PCI of the own cell. If these two values are the same, the type of CoMP is determined to be DCS, and the process proceeds to step S107. On the other hand, if these two values are different, it is determined that the CoMP type is the JT method, and the process proceeds to step S106.

In the above description, the method of determining the type of CoMP based on whether the value obtained by modulo 3 of the PCI of the CSI-RS and the value obtained by modulo 3 of the own cell is the same value has been described. The type of CoMP may be determined by

For example, the following examples exist.
(First embodiment)
Instead of modulo 3, modulo n (n is an integer) may be used. The integer n is set in advance in the terminal and the wireless communication device, or is notified from the wireless communication device to the terminal. By doing so, PCI can be allocated more flexibly according to the topology of the network.

(Second embodiment)
Whether the DCS method or the JT method is determined based on the difference in SFN (System Frame Number) between the cells of the CoMP set. In the case of the JT method, since a plurality of wireless communication apparatuses in a CoMP set send packets addressed to a terminal in cooperation with the same resource block, control is facilitated by using the same SFN between cells in the CoMP set. Therefore, for example, when the SFN is the same between the cells of the CoMP set, it is determined as the JT method, and when the SFN is different, it is determined as the DCS method. In this way, PCI can be assigned to a cell in the network without considering the type of CoMP.

(Third embodiment)
If there is only one CSI-RS setting scrambled by PCI other than its own cell, the JT method is determined. If there are two or more CSI-RS settings scrambled by PCI other than its own cell, the DCS method is used. Judge. This is because in the case of the JT method, there is always only one CSI-RS scrambled by PCI other than its own cell, whereas the CoMP set is composed of three or more cells. This is because, in the case of the DCS method, there are two or more CSI-RS settings scrambled by PCI other than the own cell.

(Fifth embodiment)
A wireless communication system according to the fifth embodiment will be described with reference to FIGS. The wireless communication system according to this embodiment is different from the first embodiment in that the terminal determines whether or not to perform measurement in consideration of the CoMP gain based on the characteristics of the event. Except for this point, this embodiment is the same as the first embodiment. In FIGS. 14 to 15, the same reference numerals are assigned to components or steps that are common to the corresponding drawings in the first embodiment.

[Configuration of Terminal of Fifth Embodiment]
FIG. 14 is a block diagram illustrating terminals constituting the wireless communication system according to the fifth embodiment. As illustrated in FIG. 14, the terminal according to the fifth embodiment includes a reception unit 101, a control unit 503, and a transmission unit 105. The terminal of this embodiment is different from the terminal of the first embodiment in that a CoMP gain consideration determination unit 511 included in the control unit 503 includes an event type determination unit 501.

When the measurement setting (MC) includes a 1-bit CoMP gain consideration flag, the CoMP gain consideration determination unit 511 requests the event type determination unit 501 to determine whether or not to consider the CoMP gain. Output measurement settings.

The CoMP gain consideration determination unit 511 considers the CoMP gain when the measurement setting does not include a CoMP gain consideration flag and when the event type determination unit 501 instructs to perform measurement without considering the CoMP gain. It is determined that measurement is not performed. At this time, the CoMP gain consideration determination unit 511 sets the settings necessary for the measurement of the own cell such as the frequency of the own cell, the PCI (Physical Cell ID), the CRS setting, the RSSI setting, and the layer 3 filtering setting of the own cell. To 123.

On the other hand, the CoMP gain consideration determination unit 511 determines that the measurement considering the CoMP gain is performed when the event type determination unit 501 is instructed to perform the measurement considering the CoMP gain. At this time, the CoMP gain consideration determining unit 511 determines the own cell's type such as CoMP type, own cell frequency, own cell PCI (Physical Cell ID), CSI-RS setting, RSSI setting, layer 3 filtering setting and measurement setting. Settings necessary for measurement are output to the CoMP type determination unit 113. Note that the CoMP gain consideration determination unit 511 also determines the frequency of the own cell, the PCI (Physical Cell ID), the CRS setting, the RSSI setting, and the layer 3 filtering setting even when it is determined that the measurement considering the CoMP gain is performed. Etc., and a function for outputting settings necessary for the measurement of the own cell to the normal measurement unit 123.

When the event type determining unit 501 receives a measurement setting from the CoMP gain consideration determining unit 511 and receives an inquiry about performing a measurement considering the CoMP gain, the event type determining unit 501 is based on the nature of the event set for each measurement identifier. It is determined whether or not to consider the CoMP gain. For example, the CoMP gain consideration determination unit 511 performs measurement considering the CoMP gain in the event of comparing the reception state of the own cell and the state of the adjacent cell, and otherwise performs measurement not considering the CoMP gain. judge. In addition, the CoMP gain consideration determination unit 511 performs, for example, events A1, A2, A4, B1, and B2, periodic reports that take into account the CoMP gain, and events A3, A5, and A6 set the CoMP gain. It is determined that the measurement not considered is performed. This is because it is better to consider the CoMP gain when determining the movement control. In this way, the CoMP gain can be taken into account only at a more necessary event. Furthermore, since it is only possible to send 1 bit in the measurement setting whether or not to consider the CoMP gain, the message size can be reduced.

Next, the operation of the terminal of the fifth embodiment will be described. FIG. 15 is a flowchart illustrating an example of the operation of the terminal according to the fifth embodiment. Note that step S501 is different from the flowchart of FIG. 4 described in the first embodiment.

If it is determined in step S104 that the terminal performs measurement in consideration of the CoMP gain, the terminal determines the type of event for each measurement identifier (step S501). In step S501, in the report setting associated with the measurement identifier, if the event type is set to any of events A3, A5, A6, the process proceeds to step S106, and the event is A1, A2, A4, B1. , B2, and when it is set to any of periodic reports, the process proceeds to step S108.

(Sixth embodiment)
A radio communication system according to the sixth embodiment will be described. The wireless communication system according to the present embodiment is different from the first embodiment in that both the measurement result of the own cell considering the CoMP gain and the measurement result of the own cell not considering the CoMP gain are included in the measurement result report. .

The wireless communication apparatus includes in the report setting a 1-bit flag indicating whether to include both the measurement result of the own cell considering the CoMP gain and the measurement result of the own cell not considering the CoMP gain in the measurement result report. .

The terminal considers the CoMP gain when a bit for including both the measurement result of the own cell considering the CoMP gain and the measurement result of the own cell not considering the CoMP gain is included in the measurement result report. Both the measurement result of the own cell and the measurement result of the own cell not considering the CoMP gain are included in the measurement result report.

In the case of JT, the terminal creates a measurement result report including both the measurement result of the own cell and the measurement result considering the CoMP gain. In the case of DCS, the terminal creates a measurement result report including both the measurement result of the own cell and the measurement result of the own cell including the best measurement result in the CoMP set.

By doing so, the wireless communication apparatus can determine the handover using both the case where the CoMP gain is considered and the case where the CoMP gain is not considered, so that the handover can be determined more appropriately. it can.

In addition, without including a 1-bit flag indicating whether or not to include both the measurement result of the own cell considering the CoMP gain and the measurement result of the own cell not considering the CoMP gain in the measurement result report, When performing the measurement considering the CoMP gain, the terminal may always include both the measurement result of the own cell considering the CoMP gain and the measurement result of the own cell not considering the CoMP gain in the measurement result report.

Also, event determination is always performed by conventional measurement (Measurement), and the measurement result report includes both the measurement result of the own cell considering the CoMP gain and the measurement result of the own cell not considering the CoMP gain. good.

(Seventh embodiment)
With reference to FIG. 16, the radio | wireless communications system of 7th Embodiment is demonstrated. In the wireless communication system of the present embodiment, event determination is different from that of the first embodiment.

FIG. 16 is an explanatory diagram of an example of a wireless communication system according to the seventh embodiment. The wireless communication apparatus to which the terminal is connected transmits an RRC connection reconfiguration message (RRC Connection Reconfiguration) to the terminal. The RRC connection reconfiguration message includes CSR-RS configuration (CSI-RS Configuration), CoMP type (CoMP Type), CoMP gain consideration flag, and PCI list. Here, the PCI list indicates a list of measured values of the own cell in consideration of the CoMP gain and a cell for which event determination is required.

When the CoMP gain consideration flag is included in the RRC connection reconfiguration message, the terminal measures its own cell according to the type of CoMP. The measurement method is the same as that in the first embodiment. Then, when performing event determination with a cell described in the PCI list, the terminal performs event determination with the measured value of the own cell in consideration of the CoMP gain. On the other hand, when performing an event determination with a cell not listed in the PCI list, the terminal performs an event determination with a measured value of the own cell that does not consider the CoMP gain.

When the terminal does not include the CoMP gain consideration flag in the RRC connection reconfiguration message, the terminal performs event determination using the measured value of the own cell that does not consider the CoMP gain. Since the CoMP can be maintained even if the terminal moves within the cell of the CoMP set, an appropriate cell can be selected by selecting a suitable cell within the CoMP set with the value of the own cell not considering the CoMP gain. On the other hand, since the current CoMP cannot be maintained when the terminal moves outside the cell of the CoMP set, a suitable cell can be selected by determining a suitable event based on the value of the own cell in consideration of the CoMP gain.

Note that the wireless communication device may send a measured value of its own cell that does not consider the CoMP gain and a list of cells for which event determination is required as a PCI list. In this case, when the terminal performs an event determination with a cell described in the PCI list, the terminal performs an event determination with the measured value of the own cell that does not consider the CoMP gain, and the cell is not included in the PCI list. When the event determination is performed with the list, the measured value of the own cell and the event determination are performed in consideration of the CoMP gain. By doing so, the wireless communication terminal may notify the PCI of the cell of the CoMP set. In general, since the number of cells in the CoMP set is smaller than the number of neighboring cells, the number of cells in the cell list can be reduced and the message size can be reduced. As a result, radio resources can be used effectively.

In the above embodiment, the CSI-RS configuration (CSI-RSCConfiguration) is transmitted using the RRC connection reconfiguration message (RRC Connection Reconfiguration). However, as shown in FIG. 17, broadcast information is used. May be sent. Further, the terminal may have a function of determining whether it is for JT or DCS from the CSI-RS configuration (CSI-RS configuration). At this time, the PCI of the cell of the CoMP set or the PCI for JT may be notified by the broadcast information, or the PCI of the cell of the CoMP set or the PCI for JT may be notified by the RRC connection reconfiguration message (RRC Connection Reconfiguration). . By doing so, the terminal can easily perform measurement in consideration of the CoMP gain.

In the above embodiment, a method using CSI-RS is shown, but the present invention may use a method using a reference signal other than CSI-RS. For example, a reference signal unique to the terminal may be used instead of CSI-RS. At this time, the reference signal unique to the terminal is operated in a form according to the present invention. That is, the terminal is operated so that the gain of the received power corresponding to each CoMP form can be measured. In the case of the JT method, reference signals are transmitted in the same phase from a plurality of wireless communication apparatuses that perform CoMP. In the case of the DCS scheme, the reference signal is transmitted using different resource blocks among a plurality of wireless communication apparatuses that perform CoMP. Furthermore, in the case of beam forming, a reference signal is transmitted by beam forming so that the gain of beam forming can be measured. This may be done by extending DMRS.

In the above embodiment, a resource with CoMP gain has been described as a control signal, and a resource without CoMP gain has been described as a data signal. However, the terminal needs to receive all user data by multipoint cooperation. Rather, some or all of the control information may be received by multipoint cooperation.

In each of the above embodiments, the case where the present invention is configured by hardware has been described as an example, but the present invention can also be realized by software.

Further, each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.

Further, the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

Furthermore, if integrated circuit technology comes out to replace LSIs as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. Biotechnology can be applied.

In addition, although demonstrated as an antenna in the said embodiment, it is applicable similarly also with an antenna port. An antenna port refers to a logical antenna composed of one or a plurality of physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna or the like composed of a plurality of antennas. For example, in LTE (Long Term Evolution), it is not defined how many physical antennas an antenna port is composed of, but is defined as a minimum unit in which a base station can transmit a different reference signal (Reference signal). An antenna port may be defined as a minimum unit for multiplying a weight of a precoding vector.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

This application is based on a Japanese patent application (Japanese Patent Application No. 2011-027719) filed on February 10, 2011, the contents of which are incorporated herein by reference.

A wireless communication terminal, a wireless communication device, and a wireless communication system according to the present invention are used in a wireless communication system in which a plurality of wireless communication devices perform multipoint coordination and transmit a wireless signal to the wireless communication terminal, and the wireless communication system. It is useful as a wireless communication terminal and a wireless communication device.

101 Receiving

Units

103, 203, 303, 403, 503 Control Unit 105

Transmission Units

111, 311, 511 CoMP Gain

Consideration Determination Units

113, 413 CoMP

Type Determination Units

115, 215, 315 Measurement Management Unit 117 Event Determination Unit 119 Measurement Result Report Creation unit 121 Adjacent cell measurement unit 123

Normal measurement unit

125, 225

JT measurement unit

127, 227 DCS measurement unit 151 Wireless reception unit 153

Network reception unit

155, 455 Control unit 157 Network transmission unit 159 Wireless transmission unit 161 CSI-RS Creation unit 163 Measurement setting creation unit 171 CoMP gain measurement setting creation unit 173 Normal measurement setting creation unit

Claims

The wireless communication terminal used in a wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination and transmit a wireless signal to the wireless communication terminal,
A receiving unit for receiving a connection reset message transmitted from the wireless communication device to the wireless communication terminal;
The connection reconfiguration message includes a measurement setting including a CoMP gain consideration flag indicating whether or not to consider a CoMP gain, a reference signal setting required when the wireless communication terminal performs a measurement considering the CoMP gain, and A CoMP gain consideration determination unit that determines whether to perform measurement considering the CoMP gain based on the state of the CoMP gain consideration flag included in the connection reconfiguration message,
When the CoMP gain consideration determination unit determines to perform measurement in consideration of the CoMP gain, the wireless communication terminal uses the reference signal received according to the setting of the reference signal included in the connection reset message. A measurement unit that performs measurement in consideration of the CoMP gain with respect to at least one communication cell provided by a wireless communication device that performs multi-point cooperation,
A measurement result report unit for reporting the measurement result of the measurement unit to the wireless communication device;
A wireless communication terminal comprising:
The wireless communication terminal according to claim 1,
When the CoMP gain consideration determination unit determines to perform measurement in consideration of the CoMP gain, the CoMP gain consideration determination unit includes a method determination unit that determines a method of multipoint cooperation technology,
In accordance with the method of multi-point cooperation technology determined by the method determination unit, the measurement unit is connected to the own cell, which is a communication cell to which the wireless communication terminal is connected, or each communication cell provided by the wireless communication device group. A wireless communication terminal that performs measurement in consideration of the CoMP gain.
The wireless communication terminal according to claim 2,
The multi-point cooperative technology methods include JT (Joint Transmission) method and DCS (Dynamic Cell Selection) method,
When the method determination unit determines that the JT method,
The measurement unit performs measurement of the own cell using a reference signal common between communication cells provided by the wireless communication device,
When the method determination unit determines the DCS method,
The wireless communication terminal, wherein the measurement unit performs measurement using an individual reference signal for each communication cell provided by the plurality of wireless communication devices.
The wireless communication terminal according to claim 3,
The common reference signal used in the JT method is scrambled using a common code between communication cells provided by the wireless communication device,
The wireless communication terminal, wherein the individual reference signal used in the DCS scheme is scrambled using an individual code for each communication cell provided by the plurality of wireless communication devices.
A wireless communication terminal according to any one of claims 2 to 4,
The connection reset message includes method information indicating a method of multipoint emphasis,
The wireless communication terminal, wherein the method determination unit determines a multipoint emphasis method based on the method information.
A wireless communication terminal according to any one of claims 2 to 4,
The method determination unit determines a method of multipoint cooperation technology based on a value obtained by processing an identifier attached to each communication cell provided by the plurality of wireless communication devices. Communication terminal.
The wireless communication terminal according to any one of claims 1 to 6,
The CoMP gain consideration determination unit includes an event type determination unit that determines whether to perform measurement in consideration of the CoMP gain based on the nature of the event,
The wireless communication terminal, wherein the measurement unit performs measurement in consideration of the CoMP gain for each communication cell provided by the own cell or the plurality of wireless communication devices only in a limited event.
A wireless communication terminal according to any one of claims 1 to 7,
The wireless communication terminal, wherein the CoMP gain is an improvement in reception characteristics of the wireless communication terminal when the multipoint cooperation technique is not used and the technique is used.
A plurality of wireless communication devices that provide communication cells perform the multipoint coordination for one wireless communication terminal, and are used in a wireless communication system that transmits a wireless signal to the wireless communication terminal,
The wireless communication device
A connection reconfiguration message having a measurement setting including a CoMP gain consideration flag indicating whether or not to consider the CoMP gain, and a reference signal setting necessary when the wireless communication terminal performs the measurement considering the CoMP gain. A wireless communication apparatus that transmits to the wireless communication terminal.
A wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination and transmit a wireless signal to the wireless communication terminal,
The wireless communication device
A connection reconfiguration message having a measurement setting including a CoMP gain consideration flag indicating whether or not to consider the CoMP gain, and a reference signal setting necessary when the wireless communication terminal performs the measurement considering the CoMP gain. Transmitted to the wireless communication terminal,
The wireless communication terminal is
A receiving unit for receiving the connection reset message;
A CoMP gain consideration determination unit that determines whether or not to perform measurement in consideration of the CoMP gain based on the state of the CoMP gain consideration flag included in the connection reconfiguration message;
When the CoMP gain consideration determination unit determines to perform measurement in consideration of the CoMP gain, the wireless communication terminal uses the reference signal received according to the setting of the reference signal included in the connection reset message. A measurement unit that performs measurement in consideration of the CoMP gain for at least one communication cell provided by a group of wireless communication devices that perform multi-point cooperation,
A wireless communication system, comprising: a measurement result reporting unit that reports a result measured by the measurement unit to the wireless communication device.
A wireless communication terminal measurement method in a wireless communication system in which a plurality of wireless communication devices providing communication cells perform multipoint coordination and transmit a wireless signal to the wireless communication terminal,
Receiving a connection reset message sent from the wireless communication device;
The connection reconfiguration message includes a measurement setting including a CoMP gain consideration flag indicating whether or not to consider a CoMP gain, a reference signal setting required when the wireless communication terminal performs a measurement considering the CoMP gain, and And determining whether to perform measurement considering the CoMP gain based on the state of the CoMP gain consideration flag included in the connection reconfiguration message,
When it is determined that the measurement considering the CoMP gain is performed, multipoint coordination is performed on the wireless communication terminal using the reference signal received according to the setting of the reference signal included in the connection reconfiguration message. A measurement method comprising performing measurement in consideration of the CoMP gain for at least one communication cell provided by a wireless communication apparatus to be performed.