WO2011108651A1 - 無線基地局及び移動通信方法 - Google Patents

無線基地局及び移動通信方法 Download PDF

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Publication number
WO2011108651A1
WO2011108651A1 PCT/JP2011/054930 JP2011054930W WO2011108651A1 WO 2011108651 A1 WO2011108651 A1 WO 2011108651A1 JP 2011054930 W JP2011054930 W JP 2011054930W WO 2011108651 A1 WO2011108651 A1 WO 2011108651A1
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WIPO (PCT)
Prior art keywords
carrier
scheduling
mobile station
perform
base station
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PCT/JP2011/054930
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English (en)
French (fr)
Japanese (ja)
Inventor
耕平 清嶋
尚人 大久保
石井　啓之
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NTT Docomo Inc
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NTT Docomo Inc
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Priority to US13/582,618 priority Critical patent/US8842627B2/en
Publication of WO2011108651A1 publication Critical patent/WO2011108651A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users

Definitions

  • the present invention relates to the technical field of mobile communication, and more particularly to a radio base station and a mobile communication method in a mobile communication system using next-generation mobile communication technology.
  • WCDMA Wideband Code Division Multiple Access
  • HSDPA High-Speed Downlink Access, High-Speed Downlink Packet Access
  • HUPA High-Pulse
  • uplink packet access method that is, “LTE (Long Term Evolution) method” has been studied by the WCDMA standardization organization 3GPP, and the specification work is underway.
  • the OFDMA Orthogonal Frequency Division Multiplexing Access, Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single-Carrier Frequency Multiplication Accession
  • the OFDMA scheme is a “multicarrier transmission scheme” configured to divide each frequency band (carrier) into a plurality of narrow frequency bands (subcarriers) and perform communication using each narrow frequency band (subcarrier). It is. According to the OFDMA scheme, 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 configured to allocate a different frequency band (carrier) of one carrier frequency to each of a plurality of mobile stations UE (user equipment) and perform communication using such a carrier.
  • Carrier transmission system ”.
  • the SC-FDMA scheme the influence of interference between the mobile stations UE can be reduced easily and effectively, and the variation in transmission power can be reduced. Therefore, the SC-FDMA scheme is preferable from the viewpoint of reducing the power consumption of the mobile station UE and expanding the coverage.
  • a plurality of mobile stations UE are configured to communicate by sharing one or more physical channels in both uplink and downlink.
  • a channel shared by a plurality of mobile stations UE is generally called a “shared channel”, and in the LTE scheme, the shared channel is called “PUSCH (Physical Uplink Shared Channel, physical uplink shared channel)” in the uplink. In the downlink, it is called “PDSCH (Physical Downlink Shared Channel, physical downlink shared channel)”.
  • PUSCH Physical Uplink Shared Channel, physical uplink shared channel
  • PDSCH Physical Downlink Shared Channel, physical downlink shared channel
  • the shared channel is called “UL-SCH (Uplink Shared Channel)” in the uplink as a transport channel, and “DL-SCH (Downlink Shared Channel), downlink in the downlink. Link shared channel).
  • UL-SCH Uplink Shared Channel
  • DL-SCH Downlink Shared Channel
  • the control channel used for this signaling is “PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel)” or “DL L1 / L2 Control Channel (Downlink L1 / L2 Control Channel Downlink, Downlink Channel / Downlink Channel 1 in LTE). L2 control channel) ".
  • the process of selecting which mobile station UE is assigned a shared channel for each subframe is generally called “scheduling”. Further, the expression “allocating a shared channel” described above may be expressed as “allocating a radio resource for the shared channel”.
  • the information transmitted on the PDCCH includes, for example, “Downlink Scheduling Information (downlink scheduling information)”, “Uplink Scheduling Grant (uplink scheduling grant)”, and the like.
  • Downlink Scheduling Information includes, for example, downlink resource block (Resource Block) allocation information, information on UE-ID, number of streams, precoding vector (Precoding Vector), data size, etc. It includes information on modulation schemes and HARQ (hybrid automatic repeat request).
  • Uplink Scheduling Grant includes, for example, uplink resource block (Resource Block) allocation information, UE-ID, data size, modulation method, uplink transmission power information, Uplink MIMO, and the like regarding the uplink shared channel. This includes information on the Demodulation Reference Signal in Japan.
  • Downlink Scheduling Information and “Uplink Scheduling Grant” described above may be collectively referred to as “DCI (Downlink Control Information, downlink control information)”.
  • DCI Downlink Control Information, downlink control information
  • Non-Patent Document 2 The requirements for the LTE-advanced scheme are summarized in Non-Patent Document 2.
  • CA Carrier Aggregation
  • the mobile station UE when configured to perform “CA” in the uplink, transmits an uplink signal using a plurality of “CC”, and the radio base station eNB transmits the “CC”. And configured to receive uplink signals.
  • the radio base station eNB transmits a downlink signal using a plurality of “CC”, and the mobile station UE It is configured to be able to receive downlink signals using “CC”.
  • 3GPP TS 36.211 (V8.3.0), “Physical Channels and Modulation”, May 2008 3GPP TS 36.913 (V8.0.0.1), “Requirement for further advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) (LTE-Advanced)” 3GPP TS36.101 (V8.2.0), “E-UTRA UE radio transmission and reception”
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the above-described LTE-Advanced scheme has a problem that the radio base station eNB is not defined as to how to perform the scheduling process when it is set to perform “CA”.
  • the present invention has been made in view of the above-described problems, and a radio base station and a mobile communication method capable of efficiently performing scheduling processing when “CA” is set.
  • the purpose is to provide.
  • a first feature of the present invention is a radio base station configured to be able to communicate with a mobile station using a main carrier and an auxiliary carrier having different carrier frequencies, and supports each carrier.
  • a management unit configured to manage the number of mobile stations to be operated, and based on the number of mobile stations, to the scheduling target mobile station, at least of the primary carrier and the auxiliary carrier of the scheduling target mobile station
  • the gist is to include a scheduling unit configured to perform a scheduling process.
  • a first feature of the present invention is a mobile communication method for performing communication between a radio base station and a mobile station using a main carrier and an auxiliary carrier having different carrier frequencies, wherein the radio base station transmits to each carrier.
  • the gist of the invention is to have a step of performing scheduling processing on at least one of the main carrier and the auxiliary carrier of the scheduling target mobile station based on the number of corresponding mobile stations.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a figure for demonstrating the scheduling method by the wireless base station which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the scheduling method by the wireless base station which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the scheduling method by the wireless base station which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the scheduling method by the wireless base station which concerns on the 1st Embodiment of this invention.
  • FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention.
  • the mobile communication system according to the present embodiment will be described with reference to FIGS.
  • the mobile communication system according to the present embodiment includes a radio base station eNB and a mobile station UE that can communicate with the radio base station eNB.
  • the LTE also known as Evolved UTRA and UTRAN or Super 3G
  • the LTE-Advanced system is applied.
  • the “OFDMA scheme” is applied for the downlink and the “SC-FDMA scheme” is applied for the uplink.
  • the mobile communication system according to the present embodiment is configured so that the above-described “CA” can be set. Specifically, in the mobile communication system according to the present embodiment, when it is set to perform “CA”, communication using a plurality of “CCs” can be performed in the uplink and the downlink. It is configured as follows.
  • CC corresponds to one system carrier in the LTE system. That is, communication is performed using one “CC” in the LTE scheme, but communication may be performed using a plurality of “CC” in the LTE-Advanced scheme.
  • downlink In the downlink, PDSCH and PDCCH shared by each mobile station UE are used.
  • downlink user data that is, downlink normal data signals are transmitted by the PDSCH.
  • the data signal may include best effort packet data, streaming packet data, a control signal, a voice signal by VoIP (Voice over IO), and the like.
  • the best-effort packet data includes packet data for mail transmission / reception, packet data for Web browsing, and the like.
  • control signal is, for example, an RRC message, and may be transmitted after being mapped to “DCCH (Dedicated Control Channel)” that is a logical channel.
  • DCCH Dedicated Control Channel
  • the mobile station UE that communicates using the PDCCH the ID of the mobile station UE that communicates using the PDSCH, the information related to the transport format of the downlink user data (that is, the downlink scheduling information), and the PUSCH. ID, information related to the transport format of uplink user data (that is, uplink scheduling grant), etc. are notified.
  • the PDCCH may be referred to as a “downlink L1 / L2 control channel”.
  • PUSCH and PUCCH Physical Uplink Control Channel, physical uplink control shared channel
  • the radio base station eNB includes a management unit 11, a scheduling unit 12, a receiving unit 13, and a transmitting unit 14.
  • the management unit 11 is configured to manage the number of mobile stations UE corresponding to each carrier (each CC).
  • the management unit 11 sets, as the number of mobile stations UE corresponding to each carrier, the number of mobile stations UE for which RRC connection is set in each carrier (that is, “RRC connected UE count”), and scheduling targets in each carrier
  • the number of candidate mobile stations UE, the number of mobile stations UE in which uplink user data is stored in the transmission buffer in each carrier, the number of mobile stations UE that are active in each carrier, or non in each carrier -It may be the number of mobile stations UE in a DRX (non-Discontinuous Reception) state.
  • the scheduling unit 12 is configured to perform scheduling processing on the scheduling target mobile station UE in the main carrier (main carrier) of the mobile station UE. Yes.
  • the scheduling unit 12 performs scheduling based on the number of mobile stations UE corresponding to each carrier managed by the management unit 11.
  • the mobile station UE is configured to perform scheduling processing in at least one of the main carrier (main carrier) and the auxiliary carrier.
  • the main carrier is a so-called “anchor carrier”
  • the auxiliary carrier is a carrier (CC) other than the anchor carrier.
  • the anchor carrier may be defined as a carrier from which a PDCCH signal is transmitted among a plurality of “CCs”, or may be defined as a carrier from which a PHICH (Physical HARQ Indicator Channel) signal is transmitted.
  • PHICH Physical HARQ Indicator Channel
  • “Semi-persistent Scheduling” may be applied and defined as a carrier on which a PDSCH signal is transmitted, or “Semi-persistent Scheduling” is applied and a carrier on which a PHICH signal for a PUSCH signal is transmitted Or a carrier on which a paging signal is transmitted, a carrier on which a DCCH signal is transmitted, or measurement (Measurement). It may be defined as the carrier is performed. Or the definition of an anchor carrier may be defined by the combination of the definition mentioned above.
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the primary carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A to be scheduled is When it is determined that there are more than the predetermined threshold (that is, during congestion), the mobile station UE # A is configured to perform scheduling processing only in the main carrier (carrier # 1) of the mobile station UE # A. Also good.
  • the scheduling unit 12 has the number of mobile stations UE corresponding to the primary carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A to be scheduled.
  • the predetermined threshold that is, when there is no congestion
  • each of the main carrier (carrier # 1) and the auxiliary carrier (carrier # 2) of the mobile station UE # A is separately provided for the mobile station #A. It may be configured to perform scheduling processing.
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the auxiliary carrier (carrier # 2) of the scheduling target mobile station UE # A is larger than a predetermined threshold, as illustrated in FIG.
  • the mobile station #A may be configured to perform scheduling processing only on the main carrier (carrier # 1) of the mobile station #A.
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the auxiliary carrier (carrier # 2) of the mobile station UE # A to be scheduled is less than a predetermined threshold. In this case (that is, when there is no congestion), scheduling processing is performed on the main carrier (carrier # 1) of the mobile station UE # A for the mobile station UE # A, and then the auxiliary carrier (carrier # of the mobile station UE # A). It may be configured to perform a scheduling process in 2).
  • the scheduling unit 12 determines that the mobile station UE # A does not use all the resources (RB) in the carrier # 2 by the mobile station UE # D. On the other hand, in addition to the resource (RB) in carrier # 1, the surplus resource (RB) in carrier # 2 can be allocated.
  • the scheduling unit 12 may be configured to allocate all resources in the auxiliary carrier to the mobile station UE having a high priority in the scheduling process in the auxiliary carrier of each mobile station UE, You may be comprised so that the resource in this auxiliary
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the primary carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A to be scheduled is When it is determined that the number is larger than the predetermined threshold (that is, during congestion), the mobile station UE # A is configured to perform scheduling processing only on the main carrier (carrier # 1) of the mobile station UE # A. Also good.
  • the scheduling unit 12 has the number of mobile stations UE corresponding to the primary carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A to be scheduled.
  • the mobile station UE # A has one main carrier (carrier # 1) and one auxiliary carrier (carrier # 2) for the mobile station UE # A. It may be configured to perform scheduling processing by regarding it as a carrier.
  • the scheduling unit 12 is configured to stop the scheduling process in one of the carrier # 1 and the carrier # 2 and perform only the scheduling process in the other.
  • the scheduling unit 12 is configured to perform the scheduling process by regarding the resource (RB) in the carrier # 1 and the resource (RB) in the carrier # 2 as a resource (RB) in one carrier.
  • the scheduling unit 12 may perform the “CA” in the uplink when the uplink propagation state between the radio base station eNB and the mobile station UE is poor (for example, the path loss is large) even in a non-congested state. ” May not be performed.
  • the receiving unit 13 is configured to receive a PUSCH signal, a PUCCH signal, and the like transmitted by the mobile station UE.
  • the reception unit 13 is transmitted by using the plurality of “CC” by the mobile station UE. It is configured to receive a signal.
  • the receiving unit 13 The mobile station UE is configured to receive a signal transmitted using one “CC”.
  • the transmission unit 14 is configured to transmit a PDSCH signal, a PDCCH signal, a PHICH signal, and the like to the mobile station UE.
  • the transmission unit 14 uses the plurality of “CC” to signal the mobile station UE. Is configured to send.
  • the transmission unit 14 The mobile station UE is configured to transmit a signal using one “CC”.
  • the mobile station UE includes a control unit 21, a measurement unit 22, a transmission unit 23, and a reception unit 24.
  • the control unit 21 is configured to control whether or not the mobile station UE is set to perform “CA”.
  • control unit 21 is configured to determine whether or not to perform “CA” in the mobile station UE in response to an instruction from a network, for example, a radio base station eNB or an exchange MME (Mobility Management Entity). May be.
  • a network for example, a radio base station eNB or an exchange MME (Mobility Management Entity). May be.
  • control unit 21 Even when the control unit 21 is instructed to set “CA” by the network, the control unit 21 changes the uplink propagation state (for example, path loss) between the radio base station eNB and the mobile station UE. Accordingly, it may be configured to control whether or not to set “CA” in the uplink.
  • uplink propagation state for example, path loss
  • the measuring unit 22 is configured to measure the radio quality of the carrier in the communicating cell and the surrounding cells.
  • the measurement unit 22 is configured to measure the radio quality of a plurality of carriers (main carrier and auxiliary carrier) even when the control unit 21 determines not to perform “CA”. May be.
  • the measurement unit 22 may be configured to instruct the transmission unit 23 to transmit a measurement report (Measurement Report) including the measurement result measured by the measurement unit 22 to the radio base station eNB. Good.
  • a measurement report Measurement Report
  • the transmission unit 23 is configured to transmit a PUSCH signal, a PUCCH signal, and the like to the radio base station eNB.
  • the transmission unit 23 uses a plurality of “CC” for the radio base station eNB. It is configured to transmit a signal.
  • the transmission unit 23 The radio base station eNB is configured to transmit a signal using one “CC”.
  • the receiving unit 24 is configured to receive a PDSCH signal, a PDCCH signal, a PHICH signal, and the like transmitted by the radio base station eNB.
  • the receiving unit 24 is transmitted by the radio base station eNB using the plurality of “CC”. Configured to receive the received signal.
  • the receiving unit 24 is configured to receive a signal transmitted using one “CC”.
  • the scheduling process is performed on both the main carrier and the auxiliary carrier of the mobile station UE to be scheduled.
  • the peak throughput in the scheduling target mobile station UE can be increased without using a simple configuration.
  • the mobile communication system it is possible to reduce the processing load in the radio base station eNB by not setting “CA” at the time of congestion.
  • the data stored in the transmission buffer in the mobile station UE is managed separately for the main carrier and the auxiliary carrier by performing the scheduling process only on the main carrier. There is no need.
  • the first feature of the present embodiment is a radio configured to be able to communicate (perform “CA”) with a mobile station UE using a main carrier and an auxiliary carrier having different carrier frequencies.
  • a base station eNB which is configured to manage the number of mobile stations UE corresponding to each carrier, and based on the number of mobile stations UE corresponding to each carrier, scheduling target mobile stations
  • a scheduling unit 12 configured to perform a scheduling process on at least one of a main carrier (carrier # 1) and an auxiliary carrier (carrier # 2) of the mobile station UE # A for the UE #A Is the gist.
  • the scheduling unit 12 corresponds to the main carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A that is set to perform “CA”.
  • the mobile station UE # A is configured to perform scheduling processing only in the main carrier (carrier # 1) of the mobile station UE # A.
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the main carrier (carrier # 1) and the auxiliary carrier (carrier # 2) of the mobile station UE # A by the scheduling process is less than a predetermined threshold, Scheduled separately for station #A in each of the primary carrier (carrier # 1) and auxiliary carrier (carrier # 2) of mobile station UE # A It may be configured to perform ing process.
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the auxiliary carrier (carrier # 2) of the mobile station UE # A by the scheduling process is greater than a predetermined threshold
  • the mobile station #A is configured to perform the scheduling process only in the main carrier (carrier # 1) of the mobile station #A, and the scheduling unit 12 performs the auxiliary carrier (
  • the mobile station UE # A performs scheduling processing on the main carrier (carrier # 1) of the mobile station UE # A After that, it is configured to perform scheduling processing in the auxiliary carrier (carrier # 2) of the mobile station UE # A It may be.
  • the scheduling unit 12 determines that the number of mobile stations UE corresponding to the main carrier (carrier # 1) and the auxiliary carrier (carrier # 2) of the mobile station UE # A by the scheduling process is a predetermined threshold value.
  • the mobile station UE # A is configured to perform the scheduling process only on the main carrier (carrier # 1) of the mobile station UE # A, and the scheduling unit 12 When it is determined that the number of mobile stations UE corresponding to the main carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A is less than a predetermined threshold, for the mobile station UE # A, Schedule the main carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A as one carrier It may be configured to perform ring process.
  • the number of mobile stations UE corresponding to each carrier is the number of mobile stations UE for which an RRC connection is set in each carrier, the number of scheduling target candidate mobile stations UE in each carrier.
  • the number of mobile stations UE in which data is stored in the transmission buffer in each carrier, the number of mobile stations UE in an active state in each carrier, or the number of mobile stations UE in a non-DRX state in each carrier May be.
  • the scheduling unit 12 may be set to perform “CA” for each mobile station UE when it is not crowded.
  • a second feature of the present embodiment is a mobile communication method in which a radio base station eNB communicates between a radio base station eNB and a mobile station UE by using a main carrier and an auxiliary carrier having different carrier frequencies. Based on the number of mobile stations UE corresponding to each carrier, the main carrier (carrier # 1) and auxiliary carrier (carrier # 2) of the mobile station UE # A with respect to the mobile station UE # A to be scheduled by the scheduling process
  • the gist of the invention is to have a step of performing a scheduling process in at least one of the above.
  • the mobile station UE may be set to perform “CA” when it is not crowded.
  • 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 a storage medium of an arbitrary format such as a CD-ROM.
  • Such a 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. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE and the radio base station eNB. Further, the storage medium and the processor may be provided in the mobile station UE and the radio base station eNB as discrete components.
  • eNB radio base station UE ... mobile station 11 ... management unit 12 ... scheduling unit 13, 24 ... receiving unit 14, 23 ... transmitting unit 21 ... control unit 22 ... measuring unit

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2011/054930 2010-03-04 2011-03-03 無線基地局及び移動通信方法 Ceased WO2011108651A1 (ja)

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