WO2010126107A1 - Station mobile et système de communication mobile - Google Patents

Station mobile et système de communication mobile Download PDF

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Publication number
WO2010126107A1
WO2010126107A1 PCT/JP2010/057622 JP2010057622W WO2010126107A1 WO 2010126107 A1 WO2010126107 A1 WO 2010126107A1 JP 2010057622 W JP2010057622 W JP 2010057622W WO 2010126107 A1 WO2010126107 A1 WO 2010126107A1
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WIPO (PCT)
Prior art keywords
carrier
mobile station
radio quality
ghz band
frequency band
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Application number
PCT/JP2010/057622
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English (en)
Japanese (ja)
Inventor
啓之 石井
Original Assignee
株式会社エヌ・ティ・ティ・ドコモ
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Publication of WO2010126107A1 publication Critical patent/WO2010126107A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to a mobile station and a mobile communication system.
  • WCDMA Wideband code division multiple access
  • HSDPA High-Speed Downlink Packet Access
  • HSUPA High-speed uplink packet access
  • LTE long term evolution
  • an orthogonal frequency division multiple access (OFDMA) scheme is defined for the downlink, and a single carrier frequency division multiple access (SC-FDMA: Single-Carrier) is defined for the uplink.
  • SC-FDMA Single-Carrier
  • the OFDMA scheme is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each subcarrier.
  • a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each subcarrier.
  • high-speed transmission can be realized by arranging the subcarriers densely while being orthogonal to each other on the frequency axis, and it can be expected that the frequency utilization efficiency is improved.
  • the SC-FDMA scheme is a single carrier transmission scheme in which a frequency band is divided for each terminal and transmitted using a different frequency band among a plurality of terminals. According to the SC-FDMA scheme, the interference between terminals can be easily and effectively reduced, and the variation in transmission power can be reduced. Therefore, the SC-FDMA scheme reduces the power consumption of the terminal and reduces the coverage. It is preferable from the viewpoint of enlargement or the like.
  • communication is performed by allocating one or more resource blocks (RBs) to mobile stations in both downlink and uplink.
  • RBs resource blocks
  • the radio base station eNB decides to which mobile station a resource block is allocated among a plurality of mobile stations every subframe (1 ms in the LTE scheme) (this process is called “scheduling”). ).
  • the radio base station eNB transmits a shared channel signal using one or more resource blocks to the mobile station selected in scheduling, and in the uplink, the mobile station selected in scheduling
  • the shared channel signal is transmitted to the radio base station eNB using one or more resource blocks.
  • the shared channel signal is a signal on a PUSCH (Physical Uplink Shared Channel) in the uplink, and a signal on a PDSCH (Physical Downlink Shared Channel) in the downlink.
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • the LTE-Advanced method is being studied by 3GPP.
  • the mobile station UE receives a downlink signal using a plurality of carriers at the same time, or transmits an uplink signal using a plurality of carriers at the same time. Can do.
  • the radio base station eNB determines whether or not to perform carrier aggregation according to a measurement result such as radio quality in the mobile station UE.
  • the present invention has been made in view of the above-described problems, and a mobile station that can appropriately determine whether to perform carrier aggregation while preventing an increase in power consumption in the mobile station UE and
  • An object is to provide a mobile communication system.
  • a first feature of the present invention is a report configured to be able to report radio quality of a carrier in a first frequency band and radio quality of a carrier in a second frequency band to a radio base station. And when the radio quality in the carrier in the first frequency band is lower than a first threshold, the reporting unit has a radio quality in the carrier in the first frequency band and a carrier in the second frequency band. When the radio quality in the carrier in the first frequency band exceeds a second threshold, the report unit is configured to report both the radio quality in the carrier in the first frequency band.
  • the gist is that it is configured to report.
  • the second feature of the present invention is that the first communication area where the carrier in the first frequency band is used and the second communication area where the carrier in the second frequency band is used are at least partially overlapped geographically.
  • a mobile communication system comprising a radio base station that manages the first communication area and the second communication area, wherein the mobile station has a radio quality of a carrier in the first frequency band that is lower than a first threshold value.
  • a report unit configured to report only radio quality in a carrier in the first frequency band, Receiving a downlink signal using a carrier in a frequency band and a carrier in the second frequency band, or using one of the carrier in the first frequency band or the carrier in the second frequency band; Or a communication unit configured to transmit an uplink signal, wherein the radio base station determines the downlink signal of the mobile station according to the radio quality reported by the mobile station.
  • a determination unit configured to determine a carrier used for transmission of a reception or uplink signal, and a control signal transmission unit configured to transmit a control signal designating the determined carrier The gist is to do.
  • the present invention it is possible to provide a mobile station and a mobile communication system that can appropriately determine whether to perform carrier aggregation while preventing an increase in power consumption in the mobile station UE. be able to.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
  • FIG. 3 is a functional block diagram of the mobile station according to the first embodiment of the present invention.
  • FIG. 4 is a diagram for explaining “Carrier Aggregation” performed by the mobile station according to the first embodiment of the present invention.
  • FIG. 5 is a diagram for explaining “Carrier Aggregation” performed by the mobile station according to the first embodiment of the present invention.
  • FIG. 6 is a flowchart showing the operation of the mobile station according to the first embodiment of the present invention.
  • FIG. 7 is a sequence diagram showing operations of the mobile communication system according to the first embodiment of the present invention.
  • FIG. 8 is a flowchart showing an operation of the radio base station according to the first embodiment of the present invention.
  • the mobile communication system is, for example, a system to which the “Evolved UTRA and UTRAN (also known as Long Term Evolution or Super 3G)” scheme or the LTE-Advanced scheme is applied.
  • the “Evolved UTRA and UTRAN also known as Long Term Evolution or Super 3G)” scheme or the LTE-Advanced scheme is applied.
  • a cell 1 (first communication area) and a 3.5 GHz band (second frequency band) in which carriers in the 2 GHz band (first frequency band) are used.
  • the cell 2 (second communication area) in which the carrier is used overlaps at least partially geographically.
  • the cell 1 uses a lower frequency than the cell 2 and has a wide cover area, but uses a small frequency bandwidth and a low throughput.
  • cell 2 uses a higher frequency than cell 1 and has a narrow cover area, but uses a large frequency bandwidth and a high throughput.
  • the mobile station UE is located in a carrier in a 2 GHz band with a wide coverage area in an idle state, that is, in a standby state.
  • the mobile station UE can perform the same processing when the mobile station UE is located in a carrier in the 3.5 GHz band instead of a carrier in the 2 GHz band.
  • the cell 1 in which the carrier in the 2 GHz band shown in FIG. 1 is used and the cell 2 in which the carrier in the 3.5 GHz band is used are examples, and other carriers such as a carrier in the 800 MHz band and a 2.6 GHz band are examples. May be used. Further, a cell in which three or more carriers are used instead of two carriers may be geographically overlapped at least partially.
  • the first frequency band and the second frequency band may be referred to as a frequency band.
  • the frequency band in the LTE scheme or LTE-Advanced scheme is defined in “5.5 Operating bands” of 3GPP TS36.101.
  • the uplink frequency in Band 1 is 1920 MHz to 1980 MHz
  • the uplink frequency in Band 6 is 830 MHz to 840 MHz.
  • Carrier Aggregation may be applied. That is, in the uplink or downlink, communication using a plurality of “Component Carriers (component carriers)” is performed.
  • “Component Carrier” corresponds to one system carrier in the LTE system. That is, in the LTE method, communication is performed using one “Component Carrier”, but in the LTE-Advanced method, communication may be performed using two or more “Component Carriers”.
  • PDSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the ID of the mobile station UE that communicates using the “physical downlink shared channel (PDSCH)” via the “physical downlink control channel (PDCCH)” and the information on the transport format of the user data (that is, the downlink) Scheduling information) and control signals such as the ID of the mobile station UE that communicates using the “physical uplink shared channel (PUSCH)” and information on the transport format of user data (ie, uplink scheduling grant) are notified. .
  • PDCCH Physical downlink control channel
  • DCI downlink control information
  • broadcast information is mapped to “BCCH: Broadcast Control Channel” as a logical channel and transmitted.
  • BCH Broadcast Channel
  • P- Physical Broadcast Channel
  • DL-SCH Downlink Shared Channel
  • PDSCH physical downlink shared channel
  • the “physical uplink shared channel (PUSCH)” and the “physical uplink control channel (PUCCH)” that are shared and used by the mobile stations UE are used in the uplink.
  • PUSCH Physical uplink shared channel
  • the “physical uplink control channel (PUCCH)” allows downlink processing for use in scheduling processing, adaptive modulation / demodulation, and coding processing (AMCS: Adaptive Modulation and Coding Scheme) of “physical downlink shared channel (PDSCH)”.
  • ACS Adaptive Modulation and Coding Scheme
  • PDSCH Physical downlink shared channel
  • Quality information CQI: Channel Quality Indicator
  • delivery confirmation information Acknowledgement Information
  • Such downlink quality information may be referred to as “CSI (Channel State Information)”, which is an indicator that summarizes “CQI”, “PMI (Pre-coding Matrix Indicator)” and “RI (Rank Indicator)”. .
  • CSI Channel State Information
  • the contents of the delivery confirmation information include an acknowledgment (ACK: Acknowledgment) indicating that the transmission signal has been properly received or a negative acknowledgment (NACK: Negative Acknowledgment) indicating that the transmission signal has not been properly received. It is expressed by either.
  • ACK Acknowledgment
  • NACK Negative Acknowledgment
  • the transmission timing of the above-described CQI and delivery confirmation information is the same as the transmission timing of the “physical uplink shared channel (PUSCH)”
  • the CQI and the delivery confirmation information are referred to as “physical uplink shared channel ( (PUSCH) ”may be multiplexed and transmitted.
  • the radio base station eNB includes a broadcast information transmission unit 11, an acquisition unit 12, a determination unit 12 ⁇ / b> A, a determination unit 13, and a control signal transmission unit 14.
  • the broadcast information transmitting unit 11 is configured to transmit broadcast information to the mobile stations UE in the cell 1 and the cell 2 via the above-described BCCH.
  • the broadcast information transmitting unit 11 may be configured to transmit broadcast information designating predetermined information.
  • the mobile station UE is configured to perform measurement processing based on predetermined information.
  • the broadcast information transmission unit 11 may be configured to designate the radio quality in the mobile station UE as the predetermined information.
  • the broadcast information transmission unit 11 may use “CQI”, “SIR (Signal-to-Interference Ratio)”, “Path Loss”, “RSRP (Reference Signal Received Power)”, “RSRQ (RSRQ) as radio quality in the mobile station UE. “Reference Signal Received Quality)” or “Power Headroom” may be designated.
  • the broadcast information transmission unit 11 is configured to designate, as the predetermined information, a predetermined carrier or a predetermined frequency band as a measurement target of the radio quality in the mobile station UE together with the radio quality in the mobile station UE. It may be.
  • the broadcast information transmitting unit 11 is configured to designate the following information regarding the carrier as the measurement target of the radio quality in the mobile station UE, as the predetermined information, together with the radio quality in the mobile station UE. It may be.
  • the broadcast information transmission unit 11 is configured to separately transmit system information for cell reselection of different frequencies to the mobile station UE as broadcast information.
  • the information may be configured to be specified to the mobile station UE.
  • a flag may be defined as to whether or not to perform measurement of carriers other than the carriers that are present and report predetermined information.
  • an information element for designating predetermined information to be measured may be defined.
  • the broadcast information transmitting unit 11 may specify the carrier frequency of the cell 1 and the carrier frequency of the cell 2 in the mobile communication system shown in FIG. 1 as the predetermined carrier.
  • the broadcast information transmitting unit 11 has the frequency band of the cell 1 (that is, 2 GHz band) and the frequency band of the cell 2 (that is, 3.5 GHz) as the predetermined frequency band in the mobile communication system illustrated in FIG. Band) may be specified.
  • the frequency band may be a frequency band.
  • the frequency band in the LTE scheme or LTE-Advanced scheme is defined in “5.5 Operating bands” of 3GPP TS36.101.
  • the downlink frequency in Band 1 is 2110 MHz to 2170 MHz
  • the downlink frequency in Band 6 is 875 MHz to 885 MHz.
  • the broadcast information transmitting unit 11 may be configured to designate a carrier that may be set as an “anchor carrier” described later as the predetermined carrier.
  • the “anchor carrier” may be referred to as a “main carrier” or a “primary carrier”.
  • the broadcast information transmitting unit 11 may be configured to designate a frequency band to which a carrier that may be set as the above-mentioned “anchor carrier” belongs as the predetermined frequency band.
  • the broadcast information transmission unit 11 designates, as the predetermined information, the location of the mobile station UE, the radio quality at the mobile station UE, the amount of data in the transmission buffer at the mobile station UE, or the moving speed of the mobile station UE. It may be configured.
  • the broadcast information transmission unit 11 may be configured to specify a report condition of a measurement result in the mobile station UE as the predetermined information.
  • the notification information transmission unit 11 may be configured to designate a first threshold value and a second threshold value, which will be described later, as the predetermined information.
  • first threshold value and the second threshold value may be the same value or different values. Further, the first threshold value and the second threshold value may be the same values as “Sintrasearch” and “Snoninsearch” defined in the LTE scheme.
  • the information transmitted from the broadcast information transmitting unit 11 to the mobile station UE via the BCCH may be transmitted from the radio base station eNB to the mobile station UE by an RRC message.
  • the RRC message is a control signal (DCCH: Dedicated Control Channel) exchanged individually between the radio base station eNB and the mobile station UE.
  • DCCH Dedicated Control Channel
  • the radio base station eNB notifies the mobile station UE that performs a handover (HO: Handover) of the above information in the handover destination radio base station eNB.
  • HO Handover
  • the mobile station UE since the mobile station UE does not need to reread the broadcast information of the radio base station eNB that is the HO destination at the handover destination, it is possible to reduce the interrupt time in the handover.
  • the RRC message may be transmitted to the mobile station UE via the broadcast information transmission unit 11 or may be transmitted to the mobile station UE from another functional unit in the radio base station eNB.
  • the acquisition unit 12 determines determination information for determining whether or not the mobile station UE should perform carrier aggregation for transmitting an uplink signal using a carrier in the 2 GHz band and a carrier in the 3.5 GHz band. Is configured to get.
  • the acquisition unit 12 uses, as determination information, the location of the mobile station UE, the radio quality in the mobile station UE, the congestion level in the cell 1 and the cell 2, the type of data signal transmitted by the mobile station UE (for example, VoIP data signal, best effort data signal, etc.), the amount of data in the transmission buffer in the radio base station eNB or the mobile station UE, or the moving speed of the mobile station UE, the information indicating the capability of the mobile station UE At least one is configured to be acquired.
  • the type of data signal transmitted by the mobile station UE for example, VoIP data signal, best effort data signal, etc.
  • the amount of data in the transmission buffer in the radio base station eNB or the mobile station UE or the moving speed of the mobile station UE
  • the information indicating the capability of the mobile station UE At least one is configured to be acquired.
  • the acquisition unit 12 may be configured to acquire a measurement result reported by the mobile station UE in a random access procedure as determination information.
  • the acquisition unit 12 may be configured to acquire the measurement result reported by the RRC message from the mobile station UE as the determination information, or reported by the Measurement Report from the mobile station UE as the determination information.
  • the measurement result may be acquired.
  • the acquisition unit 12 may be configured to acquire the amount of data in the transmission buffer in the radio base station eNB from the transmission buffer in the radio base station eNB as determination information.
  • the determination unit 12A should perform carrier aggregation in which the mobile station UE transmits an uplink signal using a carrier in the 2 GHz band and a carrier in the 3.5 GHz band. It is configured to determine whether or not.
  • the determination unit 12A transmits a downlink signal to the mobile station UE using the carrier in the 2 GHz band and the carrier in the 3.5 GHz band based on the determination information acquired by the acquisition unit 12. It is configured to determine whether or not carrier aggregation should be performed.
  • the determination unit 12A may construct a carrier that performs carrier aggregation.
  • the determination unit 12A may set a configuration for performing carrier aggregation using the procedure of RRC.
  • the configuration for performing carrier aggregation may be a communication setting for performing carrier aggregation.
  • a control signal (RRC message) for notifying the configuration for performing carrier aggregation is transmitted to the mobile station UE.
  • the processing may be as follows.
  • the configuration may include, for example, information for designating a carrier that performs carrier aggregation to the mobile station UE.
  • the determination unit 12A may transmit a control signal (RRC message) that designates a carrier to perform carrier aggregation to the mobile station UE.
  • RRC message a control signal
  • the determination unit 12A performs carrier aggregation when the presence position of the mobile station UE is in the center of the cell. It may be determined that carrier aggregation is not performed when the location of the mobile station UE is at the cell edge.
  • the determination unit 12A determines that carrier aggregation is performed when the distance from the radio base station eNB to the mobile station UE is equal to or less than a predetermined threshold, and does not perform carrier aggregation in other cases. May be determined.
  • the determination unit 12A determines that the carrier aggregation is performed when the radio quality in the mobile station UE, for example, SIR is equal to or higher than a predetermined threshold, and the radio quality in the mobile station UE, for example, SIR is equal to or higher than the predetermined threshold. If not, it may be determined that carrier aggregation is not performed.
  • SIR is used as the radio quality, but CQI, RSRP, Pathloss, Power Headroom, RSRQ, or the like may be used instead of SIR.
  • the radio quality reported from the mobile station UE is reported as the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band, based on the radio quality in both carriers. It may be determined whether or not to perform carrier aggregation, or may be determined whether or not to perform carrier aggregation based only on the radio quality in the carrier in the 2 GHz band, and may be determined in the 3.5 GHz band. Whether or not to perform carrier aggregation may be determined based on only the wireless quality in the carrier.
  • the mobile station UE reports both the radio quality of the carrier in the 2 GHz band and the radio quality of the carrier in the 3.5 GHz band when the radio quality of the 2 GHz band is below a predetermined threshold.
  • a process of reporting only the wireless quality of the carrier in the 2 GHz band may be performed.
  • the state that the mobile station UE reports only the radio quality in the carrier in the 2 GHz band means that the radio quality in the 2 GHz band and the 3.5 GHz band is sufficiently good as will be described later. .
  • the determination unit 12A determines that the carrier aggregation is performed when only the radio quality in the carrier in the 2 GHz band is reported as the radio quality reported from the mobile station UE, and determines the radio quality in the carrier in the 2 GHz band. And carrier aggregation may be determined not to be performed when both the radio quality of the carrier in the 3.5 GHz band is reported.
  • the determination unit 12A determines that the carrier aggregation is performed when only the radio quality in the carrier in the 2 GHz band is reported as the radio quality reported from the mobile station UE, and determines the radio quality in the carrier in the 2 GHz band.
  • the carrier aggregation is performed and the radio quality is within the 3.5 GHz band. It may be determined that carrier aggregation is not performed when the wireless quality of the carrier is not equal to or higher than a predetermined threshold.
  • the determination unit 12A has a plurality of frequency bands, and the mobile station UE performs carrier aggregation based on whether or not the mobile station UE reports radio quality related to carriers in one frequency band. Whether or not to do so may be determined.
  • the carrier in one frequency band may be a carrier measured in advance designated by the radio base station eNB.
  • the determination unit 12A determines that the carrier aggregation is performed when the congestion degree in the cell 1 and the cell 2 is small, that is, when the congestion is not, and when the congestion degree in the cell 1 and the cell 2 is large, that is, If it is congested, it may be determined that carrier aggregation is not performed.
  • the degree of congestion may be determined by, for example, the number of users in the cell, that is, the number of mobile stations UE.
  • the number of users or the number of mobile stations UE may be, for example, the number of UEs that are in the RRC connected state, the number of UEs that are in communication, or in the RRC connected state. It may be the number of UEs that are in a non-DRX state, or may be the number of UEs that have data to be transmitted in the transmission buffer of the base station.
  • the determination unit 12A determines that the carrier aggregation is performed when the number of users in the cell 1 and the cell 2 is 10 or less, and the number of users in the cell 1 and the cell 2 is larger than 10. In this case, it may be determined that carrier aggregation is not performed.
  • the determination unit 12A determines that carrier aggregation is performed when the type of data signal to be transmitted is a best effort type data signal, and does not perform carrier aggregation when the type is a VoIP data signal. May be determined.
  • the determination unit 12A may determine whether to perform carrier aggregation according to the type of the data signal.
  • the determination unit 12A determines that the carrier aggregation is performed when the data amount in the transmission buffer in the radio base station eNB or the mobile station UE is equal to or greater than a predetermined threshold, and the radio base station eNB or the mobile station UE It may be determined that carrier aggregation is not performed when the amount of data in the transmission buffer is not equal to or greater than a predetermined threshold.
  • the determination unit 12A may determine whether to perform carrier aggregation based on the amount of data in the transmission buffer.
  • the determination unit 12A determines that carrier aggregation is performed when the moving speed in the mobile station UE is equal to or less than a predetermined threshold, and when the moving speed in the mobile station UE is not equal to or less than the predetermined threshold, the carrier aggregation It may be determined not to perform.
  • the determination unit 12A may determine whether to perform carrier aggregation based on the moving speed of the mobile station UE.
  • carrier aggregation can be performed when the moving speed is small and the possibility of going out of the cell of the 3.5 GHz band, that is, the cell 2 is small.
  • the scheduling process in the radio base station eNB is not performed by performing carrier aggregation. It becomes possible to reduce the load.
  • the determination unit 12A determines that carrier aggregation is performed when carrier aggregation can be performed as the capability of the mobile station UE, and when carrier aggregation cannot be performed as the capability of the mobile station UE. It may be determined that carrier aggregation is not performed.
  • Type of data signal for example, VoIP data signal, best effort data signal, etc.
  • data amount in transmission buffer in radio base station eNB or mobile station UE moving speed of mobile station UE, or mobile station UE
  • the determination unit 13 is configured to determine a carrier that transmits a control signal, that is, an “anchor carrier” based on a determination result by the determination unit 12A.
  • the anchor carrier may be called a main carrier or a primary carrier.
  • control signal may be, for example, an RRC message or a NAS message.
  • the control signal may be a DCCH (Dedicated Control Channel) as a logical channel.
  • DCCH Dedicated Control Channel
  • control signal may be an uplink scheduling grant or downlink scheduling information in the downlink.
  • control signal may be a random access signal, that is, a random access preamble in the uplink.
  • the random access preamble is mapped to PRACH (Physical Random Access Channel).
  • control signal may be PUCCH (Physical Uplink Control Channel) in the uplink.
  • PUCCH Physical Uplink Control Channel
  • anchor carrier is not limited to the above-described carrier that transmits a control signal, but may be other definitions.
  • the definition of “anchor carrier” includes “Measurement Report (measurement report)”, “Handover Command (handover instruction signal)”, “Handover Complete (handover completion signal)”, and the establishment of a radio link. It may be a carrier that monitors / failure or a carrier that detects establishment / failure of a radio link.
  • the anchor carrier may be notified from the radio base station eNB to the mobile station UE by an RRC message.
  • the determination unit 12A should not perform the above-described carrier aggregation for the mobile station UE # A that is waiting in the vicinity of the end of the cell 1, that is, only the carrier in the 2 GHz band. May be used to determine that communication with the radio base station eNB should be performed.
  • the determination unit 12A determines whether or not the mobile station UE is waiting in the vicinity of the end of the cell 1, in the presence position of the mobile station UE reported from the mobile station UE or in the mobile station UE. You may determine by radio
  • the determination unit 12A determines that the mobile station UE is waiting in the vicinity of the end of the cell 1 when the radio quality in the mobile station UE, for example, “RSRP” is determined, and the “RSRP” in the mobile station UE is small. May be.
  • the determination unit 12A should perform the above-described carrier aggregation in the mobile station UE # A that is waiting in the vicinity of the end of the cell 1, that is, the carrier in the 2 GHz band and It is determined that communication with the radio base station eNB should be performed using a carrier in the 3.5 GHz band, and the determination unit 13 is configured to set the carrier in the 2 GHz band as an “anchor carrier”. Also good.
  • the determination unit 12A may be configured to set a carrier in the 2 GHz band as an anchor carrier when radio quality in the mobile station UE, for example, RSRP is equal to or less than a predetermined threshold.
  • the 2 GHz band coverage such as the mobile station UE # A exists, but the mobile carrier UE whose coverage in the 3.5 GHz band may not be sufficient, the anchor carrier is set to the 2 GHz band. It becomes possible to set, and stable communication can be realized.
  • RSRP radio quality
  • radio quality other than “RSRP” may be used.
  • the determination unit 12A should perform the above-described carrier aggregation in the mobile station UE # B that is waiting in the vicinity of the end of the cell 2, that is, the carrier in the 2 GHz band and It may be determined that communication with the radio base station eNB should be performed using a carrier in the 3.5 GHz band.
  • the determination unit 12A performs carrier aggregation when the radio quality in the mobile station UE, for example, “RSRP” is equal to or higher than the first threshold and is equal to or lower than the “RSRP” second threshold, You may judge.
  • the determination unit 13 may be configured to set a carrier in the 2 GHz band as an “anchor carrier”, and a carrier having the smallest congestion in the 2 GHz band and the 3.5 GHz band is referred to as an “anchor carrier”. May be determined.
  • the determining unit 13 designates a carrier in the 2 GHz band as an anchor carrier, and the moving speed is a predetermined threshold. If not, it may be configured to designate a carrier in the 3.5 GHz band as an anchor carrier.
  • the determination unit 12A determines that carrier aggregation is performed, if the data amount in the transmission buffer is equal to or greater than a predetermined threshold, the determination unit 13 designates a carrier in the 3.5 GHz band as an anchor carrier, When the amount of data in the transmission buffer is not equal to or greater than a predetermined threshold value, a 2 GHz band carrier may be designated as an anchor carrier.
  • the 3.5 GHz band can be set as an anchor carrier.
  • the determination unit 12A determines that carrier aggregation is to be performed and the type of data signal to be transmitted is a best-effort data signal
  • the determination unit 13 uses a 3.5 GHz band carrier as an anchor carrier.
  • a carrier of 2 GHz band may be specified as an anchor carrier.
  • the determination unit 12A should perform the above-described carrier aggregation for the mobile station UE # C that is waiting in the vicinity of the center of the cell 2, that is, the carrier in the 2 GHz band and It may be determined that communication with the radio base station eNB should be performed using a carrier in the 3.5 GHz band.
  • the determination unit 13 may be configured to set a carrier in the 3.5 GHz band as an “anchor carrier”, and a carrier having the smallest congestion in the 2 GHz band and the 3.5 GHz band is “ It may be configured to be determined as “anchor carrier”.
  • the determination unit 12A should not perform the above-described carrier aggregation in the mobile station UE # C that is waiting in the vicinity of the center of the cell 2, that is, in the 3.5 GHz band. It may be determined that communication with the radio base station eNB should be performed using only the carrier.
  • the control signal transmission unit 14 notifies the radio resource used for transmission of the uplink signal in the mobile station UE via the “physical downlink control channel (PDCCH)” in the “anchor carrier” determined by the determination unit 13.
  • the control signal is configured to be transmitted.
  • control signal transmission unit 14 is used to transmit a downlink signal to the mobile station UE via the “physical downlink control channel (PDCCH)” in the “anchor carrier” determined by the determination unit 13.
  • PDCCH physical downlink control channel
  • a control signal for notifying radio resources is transmitted.
  • the downlink signal is transmitted in the same subframe as the subframe in which the physical downlink control channel is transmitted.
  • control signal transmission unit 14 is configured to transmit a control signal designating a carrier in the 2 GHz band and a carrier in the 3.5 GHz band when the determination unit 12A determines that the carrier aggregation should be performed. Has been.
  • the signal on the physical downlink control channel (PDCCH) described above may be transmitted only by an anchor carrier, or alternatively, may be transmitted in each “Component Carrier”.
  • the control signal transmission unit 14 may transmit a signal on the physical downlink control channel using a carrier other than “anchor carrier” and “anchor carrier” determined by the determination unit 13.
  • the mobile station UE includes a predetermined information receiving unit 21, a measuring unit 22, a reporting unit 23, a control signal receiving unit 31, an uplink signal transmitting unit 32, and a downlink signal receiving unit 33. It is equipped with.
  • the predetermined information receiving unit 21 is configured to receive predetermined information designated by the radio base station eNB using broadcast information.
  • the measuring unit 22 is configured to perform a measurement process based on the predetermined information received by the predetermined information receiving unit 21.
  • the measurement unit 22 determines the radio quality (for example, “CQI”, “SIR”, “path loss”, “RSRP”, “RSRQ () in the predetermined carrier or the carrier in the predetermined frequency band in accordance with the predetermined information. Reference Signal Received Quality) ”,“ Power Headroom ”, etc.), the location of the mobile station UE, the radio quality of the mobile station UE, the amount of data in the transmission buffer of the mobile station UE, or the mobile speed of the mobile station UE It may be configured to.
  • the radio quality for example, “CQI”, “SIR”, “path loss”, “RSRP”, “RSRQ () in the predetermined carrier or the carrier in the predetermined frequency band in accordance with the predetermined information. Reference Signal Received Quality) ”,“ Power Headroom ”, etc.
  • the measurement unit 22 may measure Wideband CQI that is CQI of the entire system band as such CQI, or measures CQI of each subband when the system band is divided into a plurality of subbands. May be. Further, the measurement unit 22 may measure a value obtained by further averaging the CQI in the time direction.
  • the measurement unit 22 may measure the SIR of the downlink reference signal as the SIR.
  • the measurement unit 22 may measure the SIR of the entire system band as the SIR of the downlink reference signal, or the SIR of each subband when the system band is divided into a plurality of subbands. You may measure.
  • the measurement unit 22 may calculate the path loss from the transmission power in the radio base station eNB and the reception power in the mobile station UE regarding the downlink reference signal.
  • the path loss may be measured as follows.
  • Path loss (Transmission power in radio base station eNB) ⁇ (Reception power in mobile station UE)
  • the measurement unit 22 may measure the reception power of the entire system band as “RSRP”, that is, the reception power of the downlink reference signal, or when the system band is divided into a plurality of subbands The received power of each subband may be measured.
  • the measurement unit 22 may calculate the difference between the transmission power of the uplink being transmitted and the maximum transmission power as Power Headroom.
  • the measurement unit 22 may measure the Doppler frequency as the moving speed of the mobile station UE, may measure the moving speed of the mobile station UE based on GPS data or the like, or the number across the cells Based on the above, the moving speed of the mobile station UE may be measured.
  • the measurement unit 22 may acquire a time correlation value of a downlink reference signal and measure the Doppler frequency based on the time correlation value.
  • the measurement unit 22 may consider that the time change of the propagation environment is small and determine that the Doppler frequency is small, that is, the moving speed is small.
  • the measurement unit 22 may determine that the time change of the propagation environment is large and determine that the Doppler frequency is high, that is, the moving speed is high.
  • the measuring unit 22 determines that the moving speed of the mobile station UE is high when the number across the cells is large, It may be determined that the moving speed of the mobile station UE is low when the number across the nodes is small.
  • the measurement unit 22 is configured to measure not the actual value of the movement speed of the mobile station UE but the state of the movement speed (high speed, medium speed, low speed) of the mobile station UE as the movement speed of the mobile station UE. It may be.
  • the report unit 23 is configured to report the measurement result measured by the measurement unit 22 to the radio base station eNB in the random access procedure.
  • the report unit 23 is configured to report the measurement result measured by the measurement unit 22 to the radio base station eNB using “Message 3” or “Message 5” in the random access procedure. Yes.
  • the reporting unit 23 When the radio quality in the carrier in the 2 GHz band is lower than the first threshold, the report unit is configured to report both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band. 23 may be configured to report only the radio quality in the carrier in the 2 GHz band when the radio quality in the carrier in the 2 GHz band exceeds the second threshold.
  • the measurement unit 22 measures both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band when the radio quality in the carrier in the 2 GHz band is lower than the first threshold.
  • the report unit 23 may be configured to measure only the radio quality in the carrier in the 2 GHz band when the radio quality in the carrier in the 2 GHz band exceeds the second threshold.
  • the radio quality in the carrier in the 2 GHz band exceeds the second threshold, so that 2 GHz It may be notified together with reporting only the radio quality in the carrier of the band. In this case, for example, an indicator for reporting only radio quality in a carrier of 2 GHz band may be notified.
  • the radio quality in the carrier in the 2 GHz band is less than the first threshold, so that 2 GHz Reporting both the radio quality of the carrier in the band and the radio quality of the carrier in the 3.5 GHz band may be notified together.
  • an indicator for reporting both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band may be notified.
  • the report unit 23 may be configured to report the above measurement result only when the above report condition is satisfied.
  • the report unit 23 may be configured to report the capability information of the mobile station UE in addition to the above measurement result.
  • the report unit 23 may be configured to report the capability information of the mobile station UE regarding carrier aggregation in addition to the above-described measurement result.
  • Capability information may include, for example, the following information elements: -Whether to support career aggregation -Whether to support carrier aggregation by discontinuous "Component Carrier" in one frequency band -Whether to support carrier aggregation using multiple frequency bands, that is, frequency bands -Maximum number of component carriers when performing the carrier aggregation described above -Combination of carrier aggregation supported by the mobile station UE.
  • such a combination includes, for example, carrier aggregation of 3.5 GHz band and 2 GHz band, carrier aggregation of 800 MHz band and 900 MHz band, carrier aggregation of 1.7 GHz band, 2 GHz band and 1.5 GHz band.
  • the control signal receiver 31 is configured to receive a control signal transmitted via a "physical downlink control channel (PDCCH)". Yes.
  • PDCH physical downlink control channel
  • a radio resource for example, a radio resource for “physical uplink shared channel (PUSCH)” or a mobile station used for transmission of an uplink signal in the mobile station UE by the control signal or the mobile station
  • a radio resource of a downlink signal transmitted to the UE for example, a radio resource for “physical downlink shared channel (PDSCH)
  • a radio resource in a carrier in 2 GHz band and a carrier in a 3.5 GHz band It is assumed that the radio resource is notified.
  • the control signal receiving unit 31 may be configured to receive a control signal for constructing a carrier that performs the above-described carrier aggregation.
  • the mobile station UE sets communication for performing carrier aggregation based on the control signal.
  • the uplink signal transmission unit 32 transmits the uplink signal via the radio resource notified by the control signal transmitted by the radio base station eNB, for example, “physical uplink shared channel (PUSCH)”. It is configured.
  • PUSCH physical uplink shared channel
  • the uplink signal transmission unit 32 is notified that carrier aggregation is performed by the control signal, that is, as a “physical uplink shared channel (PUSCH)” radio resource), the carrier in the 2 GHz band. 4 and a radio resource in a carrier in the 3.5 GHz band, as shown in FIG. 4, a radio resource in the carrier in the 2 GHz band (for example, “physical uplink shared channel (PUSCH)”) ) And a radio resource in a carrier in the 3.5 GHz band (for example, “physical uplink shared channel (PUSCH)”) is configured to transmit an uplink signal.
  • PUSCH physical uplink shared channel
  • the downlink signal transmission unit 33 receives the downlink signal via the radio resource notified by the control signal transmitted by the radio base station eNB, for example, “physical downlink shared channel (PDSCH)”. It is configured.
  • PDSCH physical downlink shared channel
  • the downlink signal receiving unit 33 when the downlink signal receiving unit 33 is notified that carrier aggregation is performed by the control signal, that is, as a "physical downlink shared channel (PDSCH)" radio resource), a carrier in the 2 GHz band
  • a radio resource in a carrier in a 2 GHz band for example, “physical downlink shared channel (PDSCH)” as shown in FIG.
  • a radio resource in a carrier in the 3.5 GHz band for example, “physical downlink shared channel (PDSCH)”
  • the downlink signal is configured to be received.
  • the mobile station UE may be configured to stand by on a carrier in a predetermined frequency band (for example, 2 GHz band) when the power is turned on.
  • a predetermined frequency band for example, 2 GHz band
  • the radio base station eNB designates the mobile station UE to report both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band as the measurement result. It is assumed that the first threshold value and the second threshold value are the same predetermined threshold value.
  • step S101 the mobile station UE measures the radio quality in a carrier in the 2 GHz band, and compares the radio quality in the carrier in the 2 GHz band with a predetermined threshold.
  • step S102 the mobile station UE transmits the radio quality and 3.5 GHz in the carrier in the 2 GHz band to the radio base station eNB in the random access procedure. Report both the radio quality on the carrier in the band.
  • the mobile station UE reports both the radio quality of the cell 1 and the radio quality of the cell 2 to the radio base station eNB in the random access procedure.
  • step S103 the mobile station UE reports only the radio quality in the carrier in the 2 GHz band to the radio base station eNB in the random access procedure. That is, it does not report the radio quality in the carrier in the 3.5 GHz band.
  • the mobile station UE reports only the radio quality of the cell 1 to the radio base station eNB in the random access procedure, that is, does not report the radio quality of the cell 2.
  • step S101 may be reversed.
  • path loss when path loss is used as the radio quality, it is considered that the greater the path loss, the greater the distance between the mobile station UE and the radio base station eNB and the worse the propagation environment.
  • the radio quality path loss
  • the radio quality of the cell 1 and the cell 2 is reported, and in other cases, the radio quality of the cell 1 is reported. May be.
  • the mobile station UE transmits “RA Preamble” to the radio base station eNB in step S1001.
  • the case where the random access procedure is triggered from the idle state, that is, the standby state is, for example, a case where a call is made or a call is received. That is, the random access procedure is triggered when the mobile station UE starts communication with the radio base station eNB.
  • step S1002 the radio base station eNB transmits “RA Response” to the mobile station UE in response to “RA Preamble”.
  • step S1003 the mobile station UE transmits “Scheduled Transmission (Message 3)” to the radio base station eNB according to “RA Response”.
  • the mobile station UE may transmit the “Scheduled Transmission (Message 3)” including the above measurement result.
  • step S1004 the radio base station eNB transmits “Contention Resolution” to the mobile station UE in response to “Scheduled Transmission (Message 3)”.
  • Step S1005 when the mobile station UE is instructed to transmit uplink by the uplink scheduling grant from the radio base station eNB after “Contention Resolution”, the mobile station UE transmits “UL-DCH” to the radio base station eNB. Send “Message 5” via.
  • this Contention Resolution may be performed by the above-described uplink scheduling grant.
  • the mobile station UE may transmit the above-described measurement result by using “Message 5”.
  • the radio base station eNB designates the mobile station UE to report both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band as the measurement result. is doing.
  • the mobile station UE is configured to report only the radio quality in the carrier in the 2 GHz band.
  • the radio base station eNB determines whether or not the radio quality reported from the mobile station UE is only the radio quality in the carrier in the 2 GHz band.
  • step S201 When the radio quality reported from the mobile station UE is only the radio quality in the carrier in the 2 GHz band (step S201: YES), the process proceeds to step S204.
  • step S201 when not only the radio quality in the carrier in the 2 GHz band (step S201: NO), that is, the radio quality reported from the mobile station UE is the radio quality in the carrier in the 2 GHz band and the carrier in the 3.5 GHz band. If both are wireless qualities, the process proceeds to step S202.
  • step S202 the radio base station eNB determines whether or not the radio quality in the carrier in the 2 GHz band is equal to or higher than the threshold A.
  • the radio quality in the carrier in the 2 GHz band instead of the radio quality in the carrier in the 2 GHz band, the radio quality in the carrier in the 3.5 GHz band and the threshold A may be compared.
  • the threshold A instead of the radio quality in the carrier in the 2 GHz band, the threshold A may be compared with both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band.
  • step S204 the process proceeds to step S203.
  • step S203 the radio base station eNB determines not to perform carrier aggregation, and determines to perform communication with the mobile station UE using a carrier in the 2 GHz band.
  • step S204 the radio base station eNB determines to perform carrier aggregation.
  • step S205 the radio base station eNB determines whether or not the radio quality in the carrier in the 2 GHz band is equal to or higher than the threshold value B.
  • step S207 the wireless quality in the carrier in the 2 GHz band is equal to or higher than the threshold value B (S205: NO).
  • step S206 the radio base station eNB sets a carrier in the 2 GHz band as an anchor carrier.
  • step S207 the radio base station eNB sets a carrier in the 3.5 GHz band as an anchor carrier.
  • the radio base station eNB includes the location of the mobile station UE, the radio quality in the mobile station UE, the degree of congestion in the cell 1 and the cell 2, and the data signal transmitted by the mobile station UE.
  • the radio base station eNB determines whether to perform “carrier aggregation” based on at least one of the type of data, the amount of data in the transmission buffer in the radio base station eNB or the mobile station UE, or the moving speed of the mobile station UE Since it is comprised, the effect by performing "carrier aggregation" can be enjoyed to the maximum.
  • the idle mobile station UE since the idle mobile station UE is configured to report the measurement result specified by the radio base station eNB in the random access procedure, carrier aggregation is performed. It is possible to quickly determine whether or not to perform communication, and to reduce the delay time until the start of communication.
  • the radio quality in the carrier in the 3.5 GHz band is also sufficient. Therefore, only the radio quality in the carrier in the 2 GHz band is reported, that is, the radio quality in the carrier in the 3.5 GHz band is not reported, so that the power consumption in the mobile station UE increases. Thus, it is possible to determine whether or not to perform carrier aggregation appropriately.
  • the first feature of the present embodiment is a mobile station UE, which has radio quality and a 3.5 GHz band (second frequency band) in a carrier within a 2 GHz band (first frequency band) with respect to the radio base station eNB.
  • a reporting unit 23 configured to be able to report the radio quality in the carrier within the 2 GHz band when the radio quality in the carrier within the 2 GHz band is lower than the first threshold.
  • the reporting unit 23 is configured to report the 2 GHz band when the radio quality in the carrier in the 2 GHz band exceeds the second threshold.
  • the gist is that it is configured to report only the radio quality of the internal carrier.
  • the second feature of the present embodiment is that a cell 1 (first communication area) in which a carrier in the 2 GHz band (first frequency band) is used and a cell in which a carrier in the 3.5 GHz band (second frequency band) is used.
  • 2 (second communication area) is at least partially overlapping geographically and is a mobile communication system including a radio base station eNB that manages the cell 1 and the cell 2, and the mobile station UE has a 2 GHz band If the radio quality in the carrier within the frequency falls below the first threshold, both the radio quality in the carrier in the 2 GHz band and the radio quality in the carrier in the 3.5 GHz band are reported, and the radio quality in the carrier in the 2 GHz band is the second.
  • the control unit configured to report only the radio quality in the carrier in the 2 GHz band, and the control transmitted by the radio base station eNB Depending on the signal, a downlink signal is received using a carrier in the 2 GHz band and a carrier in the 3.5 GHz band, or one of the carrier in the 2 GHz band or the carrier in the 3.5 GHz band. Or an uplink signal transmission unit 32 and a downlink signal reception unit 33 configured to transmit an uplink signal, and the radio base station eNB has a radio quality reported by the mobile station UE. In response, the mobile station UE transmits a control signal designating the determined carrier, and a determination unit 13 configured to determine a carrier used for receiving a downlink signal or transmitting an uplink signal. And a control signal transmission unit 14 configured as described above.
  • the operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .
  • Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium such as a CD-ROM.
  • the storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE or the radio base station eNB. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE or the radio base station eNB.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne une station mobile (UE) comportant une unité rapporteuse (23) conçue de manière à rapporter à la fois la qualité radio dans une porteuse située à l'intérieur d'une première bande de fréquences et la qualité radio dans une porteuse située à l'intérieur d'une seconde bande de fréquences, si la qualité radio de la porteuse située à l'intérieur de la première bande de fréquences est inférieure à un premier seuil, et conçue pour rapporter seulement la qualité radio dans la porteuse située à l'intérieur de la première bande de fréquences si la qualité radio dans la porteuse située à l'intérieur de la première bande de fréquences est supérieure à un second seuil.
PCT/JP2010/057622 2009-04-28 2010-04-28 Station mobile et système de communication mobile WO2010126107A1 (fr)

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WO2012096049A1 (fr) * 2011-01-14 2012-07-19 住友電気工業株式会社 Dispositif de station de base, dispositif terminal, et système et procédé de communication sans fil
JP2012235395A (ja) * 2011-05-06 2012-11-29 Ntt Docomo Inc ユーザ装置及び移動通信方法
WO2016072221A1 (fr) * 2014-11-06 2016-05-12 株式会社Ｎｔｔドコモ Terminal utilisateur, station de base sans fil et procédé de communication sans fil
JP2017127011A (ja) * 2010-11-15 2017-07-20 サムスン エレクトロニクス カンパニー リミテッド 移動通信システムにおける端末の速度を用いて基地局と通信する方法及び装置
WO2023095376A1 (fr) * 2021-11-26 2023-06-01 Kddi株式会社 Dispositif terminal qui exécute une procédure opérationnelle flexible de supports de composants, dispositif de station de base, procédé de commande et programme

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WO2008013026A1 (fr) * 2006-07-28 2008-01-31 Kyocera Corporation Dispositif de terminal mobile et procédé de transfert intercellulaire
JP2009060601A (ja) * 2007-08-09 2009-03-19 Infineon Technologies Ag 無線通信機器における受信品質の決定
WO2009041498A1 (fr) * 2007-09-26 2009-04-02 Nec Corporation Système et procédé de communication sans fil

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WO2008013026A1 (fr) * 2006-07-28 2008-01-31 Kyocera Corporation Dispositif de terminal mobile et procédé de transfert intercellulaire
JP2009060601A (ja) * 2007-08-09 2009-03-19 Infineon Technologies Ag 無線通信機器における受信品質の決定
WO2009041498A1 (fr) * 2007-09-26 2009-04-02 Nec Corporation Système et procédé de communication sans fil

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JP2017127011A (ja) * 2010-11-15 2017-07-20 サムスン エレクトロニクス カンパニー リミテッド 移動通信システムにおける端末の速度を用いて基地局と通信する方法及び装置
WO2012096049A1 (fr) * 2011-01-14 2012-07-19 住友電気工業株式会社 Dispositif de station de base, dispositif terminal, et système et procédé de communication sans fil
JP5842829B2 (ja) * 2011-01-14 2016-01-13 住友電気工業株式会社 基地局装置、端末装置、無線通信システム、及び方法
JP2012235395A (ja) * 2011-05-06 2012-11-29 Ntt Docomo Inc ユーザ装置及び移動通信方法
WO2016072221A1 (fr) * 2014-11-06 2016-05-12 株式会社Ｎｔｔドコモ Terminal utilisateur, station de base sans fil et procédé de communication sans fil
JPWO2016072221A1 (ja) * 2014-11-06 2017-09-21 株式会社Ｎｔｔドコモ ユーザ端末、無線基地局及び無線通信方法
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WO2023095376A1 (fr) * 2021-11-26 2023-06-01 Kddi株式会社 Dispositif terminal qui exécute une procédure opérationnelle flexible de supports de composants, dispositif de station de base, procédé de commande et programme

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