WO2014017478A1 - 基地局及び通信制御方法 - Google Patents
基地局及び通信制御方法 Download PDFInfo
- Publication number
- WO2014017478A1 WO2014017478A1 PCT/JP2013/069903 JP2013069903W WO2014017478A1 WO 2014017478 A1 WO2014017478 A1 WO 2014017478A1 JP 2013069903 W JP2013069903 W JP 2013069903W WO 2014017478 A1 WO2014017478 A1 WO 2014017478A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- enb
- carrier
- information
- component carrier
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims description 31
- 239000000969 carrier Substances 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims description 28
- 230000008859 change Effects 0.000 claims description 27
- 239000012050 conventional carrier Substances 0.000 claims description 6
- 230000002776 aggregation Effects 0.000 description 25
- 238000004220 aggregation Methods 0.000 description 25
- 238000010586 diagram Methods 0.000 description 23
- 230000004044 response Effects 0.000 description 17
- 230000007704 transition Effects 0.000 description 11
- 238000010295 mobile communication Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
-
- 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
- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- 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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- 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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a base station and a communication control method in a mobile communication system.
- 3GPP 3rd Generation Partnership Project
- LTE Advanced which is an advanced LTE (Long Term Evolution)
- LTE Advanced introduces carrier aggregation that positions carriers in LTE as component carriers and performs multi-carrier communication using a collection of multiple component carriers in order to achieve wide bandwidth while ensuring backward compatibility with LTE. (See Non-Patent Document 1).
- the base station is set to operate one component carrier (first component carrier) as a primary cell, and set to operate another component carrier (second component carrier) as a secondary cell.
- first component carrier is a cell that transmits control signals and user data.
- second component carrier is a cell that transmits user data.
- the present invention provides a base station and a communication control method that can appropriately operate a plurality of carriers.
- the base station uses a plurality of carriers for wireless communication.
- the base station is information transmitted from an adjacent base station and receives a base station information related to a user terminal connected to the base station, and a plurality of the base stations based on the base station information.
- a control unit that changes a carrier configuration of at least one of the carriers.
- the communication control method according to the second feature is used in a base station that uses a plurality of carriers for wireless communication.
- the communication control method includes information transmitted from an adjacent base station and receiving adjacent base station information related to a user terminal connected to the adjacent base station, and based on the adjacent base station information, Changing the carrier configuration of at least one of the carriers.
- Traffic Forecast message C adjacent base station information
- movement flowchart of eNB which concerns on 4th Embodiment.
- movement flowchart of the adjacent eNB which concerns on 4th Embodiment.
- movement flowchart of the adjacent eNB which concerns on 4th Embodiment.
- movement flowchart of the adjacent eNB which concerns on 4th Embodiment.
- wireless frame which concerns on other embodiment.
- the base station uses a plurality of carriers for wireless communication.
- the base station receives adjacent base station information related to a user terminal that is information transmitted from the adjacent base station and is connected to the adjacent base station.
- the base station changes a carrier configuration of at least one of the plurality of carriers based on the neighboring base station information.
- the first to third embodiments relate to a mobile communication system that supports carrier aggregation.
- Carrier aggregation performs multi-carrier communication using a first component carrier that is operated as a primary cell that transmits control signals and user data, and a second component carrier that is operated as a secondary cell that transmits user data. Is what you do.
- the primary cell (first component carrier) can transmit not only user data but also a control signal, the primary cell alone can accommodate user terminals.
- the secondary cell (second component carrier) cannot transmit the control signal, the secondary cell alone cannot accommodate the user terminal. That is, it is assumed that the secondary cell is used in combination with the primary cell.
- secondary cells are not limited to one, and may be plural.
- the fourth embodiment relates to a mobile communication system that supports a new carrier configuration (NCT: New Carrier Type).
- NCT New Carrier Type
- the transmission efficiency of user data can be increased by adopting a carrier configuration different from the conventional carrier configuration (LCT: Legacy Carrier Type).
- a carrier to which NCT is applied (NCT carrier) can accommodate only user terminals that support NCT.
- the NCT carrier has a lower reference signal density than the LCT carrier.
- the NCT carrier does not have a physical downlink control channel (PDCCH) for transmitting a downlink control signal.
- the NCT carrier has the same carrier configuration as the secondary cell described above.
- the NCT carrier is provided with an ePDCCH (enhanced PDCCH) for transmitting a downlink control signal instead of the PDCCH.
- the base station transmits a notification message regarding the load level of the base station to the adjacent base station, and the adjacent base station And B changing the carrier configuration of the second component carrier so as to operate the second component carrier as a primary cell based on the notification message.
- “send a notification message” is not limited to a case where a notification message is directly transmitted to an adjacent base station, but a case where a notification message is indirectly transmitted to an adjacent base station via an upper network entity.
- the “neighboring base station” may be a concept including the next neighboring base station.
- “changing the carrier configuration of the second component carrier” is not limited to changing the carrier configuration so that all of the second component carriers are operated as primary cells, and is not limited to one of the second component carriers. This includes the case where the carrier configuration is changed so that only a part is operated as a primary cell. In the former case, the carrier aggregation is stopped, but in the latter case, the carrier aggregation is partially continued.
- operating only a part of the second component carrier as a primary cell means that if there is one second component carrier, some subframes of one second component carrier are used as the primary cell. If there are a plurality of second component carriers, including operating, one second component carrier of the plurality of second component carriers is operated as a primary cell.
- the adjacent base station when the adjacent base station is expected from the notification message that its own load level is increased (for example, when the number of user terminals accommodated by itself is expected to increase).
- the second component carrier is changed to operate as a primary cell in preparation for an increase in load level. Therefore, when the load level of the adjacent base station actually increases, the adjacent base station can absorb the increase of the load level using the second component carrier changed to the primary cell.
- the communication control method according to the present embodiment can appropriately operate a plurality of component carriers.
- the notification message may include duration information indicating the duration of the state in which the load level of the base station exceeds a predetermined level.
- the adjacent base station can appropriately determine the timing of changing the second component carrier to the primary cell by predicting the timing when the load level of the adjacent base station increases from the duration information.
- the “predetermined level” means a load level at which the base station is recognized as being in a high load state, and can be, for example, a load level of 80% to 90% of the load capacity of the base station.
- FIG. 1 is a configuration diagram of a mobile communication system according to this embodiment.
- the mobile communication system according to the present embodiment is an LTE system configured based on LTE Advanced (3GPP Release 10 or later).
- the LTE system includes a plurality of UEs (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- the E-UTRAN 10 and the EPC 20 constitute a network.
- the UE 100 is a mobile radio communication device, and performs radio communication with a cell (serving cell) that has established a connection.
- UE100 is corresponded to a user terminal.
- the UE 100 performs radio communication with the serving cell using the primary cell and the secondary cell as a serving cell.
- the E-UTRAN 10 includes a plurality of eNBs 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 manages a cell and performs radio communication with the UE 100 that has established a connection with the cell.
- “cell” is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
- the eNB 200 has a radio resource management (RRM) function, a user data routing function, a mobility control, a measurement control function for scheduling, and the like.
- RRM radio resource management
- the EPC 20 includes MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 and OAM 400 (Operation and Maintenance).
- MME Mobility Management Entity
- S-GW Serving-Gateway
- OAM 400 Operaation and Maintenance
- the MME is a network node that performs various types of mobility control for the UE 100, and corresponds to a control station.
- the S-GW is a network node that performs transfer control of user data, and corresponds to an exchange.
- the eNB 200 is connected to each other via the X2 interface.
- the eNB 200 is connected to the MME / S-GW 300 via the S1 interface.
- the OAM 400 is a server device managed by an operator, and performs maintenance and monitoring of the E-UTRAN 10.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes an antenna 101, a radio transceiver 110, a user interface 120, a GNSS (Global Navigation Satellite System) receiver 130, a battery 140, a memory 150, and a processor 160.
- GNSS Global Navigation Satellite System
- the UE 100 may not have the GNSS receiver 130.
- the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 '.
- the antenna 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals.
- the antenna 101 includes a plurality of antenna elements.
- the radio transceiver 110 converts the baseband signal output from the processor 160 into a radio signal and transmits it from the antenna 101. Further, the radio transceiver 110 converts a radio signal received by the antenna 101 into a baseband signal and outputs the baseband signal to the processor 160.
- the user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons.
- the user interface 120 receives an operation from the user and outputs a signal indicating the content of the operation to the processor 160.
- the GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain position information indicating the geographical position of the UE 100.
- the battery 140 stores power to be supplied to each block of the UE 100.
- the memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160.
- the processor 160 includes a baseband processor that modulates / demodulates and encodes / decodes a baseband signal, and a CPU (Central Processing Unit) that executes programs stored in the memory 150 and performs various processes. .
- the processor 160 may further include a codec that performs encoding / decoding of an audio / video signal. Further, the processor 160 executes various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 includes an antenna 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 and the processor 240 constitute a control unit.
- the antenna 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the antenna 201 includes a plurality of antenna elements.
- the wireless transceiver 210 converts the baseband signal output from the processor 240 into a wireless signal and transmits it from the antenna 201.
- the radio transceiver 210 converts a radio signal received by the antenna 201 into a baseband signal and outputs the baseband signal to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes programs stored in the memory 230 and performs various processes. Further, the processor 240 executes various communication protocols described later.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system.
- the radio interface protocol is divided into layers 1 to 3 of the OSI reference model, and layer 1 is a physical (PHY) layer.
- Layer 2 includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- Layer 3 includes an RRC (Radio Resource Control) layer.
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping.
- the physical layer provides a transmission service to an upper layer using a physical channel. Data is transmitted between the physical layer of the UE 100 and the physical layer of the eNB 200 via a physical channel.
- the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Data is transmitted via the transport channel between the MAC layer of the UE 100 and the MAC layer of the eNB 200.
- the MAC layer of the eNB 200 includes a MAC scheduler that determines a transport format (transport block size, modulation / coding scheme, etc.) and resource blocks for uplink and downlink.
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data is transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane. Data is transmitted via a radio bearer between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
- the UE 100 is in the RRC connection state, and otherwise, the UE 100 is in the RRC idle state.
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- the LTE system uses OFDMA (Orthogonal Frequency Division Multiplexing Access) for the downlink and SC-FDMA (Single Carrier Division Multiple Access) for the uplink.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- SC-FDMA Single Carrier Division Multiple Access
- the radio frame is composed of 10 subframes arranged in the time direction, and each subframe is composed of two slots arranged in the time direction.
- the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
- the resource block is composed of a plurality of continuous subcarriers.
- a guard interval called a cyclic prefix (CP) is provided at the head of each symbol.
- the section of the first few symbols of each subframe is a control region mainly used as a physical downlink control channel (PDCCH) that carries a control signal.
- the control signal is, for example, uplink SI (Scheduling Information), downlink SI (Scheduling Information), and TPC bits.
- the uplink SI is a signal indicating allocation of uplink resource blocks.
- the downlink SI is a signal indicating allocation of downlink resource blocks.
- the TPC bit is a signal for instructing increase / decrease in power of a signal transmitted via an uplink channel.
- the remaining section of each subframe is an area mainly used as a physical downlink shared channel (PDSCH) that carries user data.
- PDSCH physical downlink shared channel
- both end portions in the frequency direction in each subframe are control regions mainly used as a physical uplink control channel (PUCCH) that carries a control signal.
- the control signal includes, for example, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), SR (Scheduling Request), ACK / NACK, and the like.
- the CQI is a signal that notifies a recommended modulation method and a coding rate to be used for downlink transmission.
- PMI is a signal indicating a precoder matrix that is preferably used for downlink transmission.
- the RI is a signal indicating the number of layers (number of streams) to be used for downlink transmission.
- SR is a signal for requesting allocation of uplink resource blocks.
- ACK / NACK is a signal indicating whether or not user data transmitted via a downlink channel (for example, PDSCH) has been received.
- the central part in the frequency direction in each subframe is an area mainly used as a physical uplink shared channel (PUSCH) that carries user data.
- PUSCH physical uplink shared channel
- FIG. 6 is a configuration diagram of a radio frame when carrier aggregation is applied in the downlink.
- CC component carriers
- the two component carriers (CC1, CC2) may be continuous in the frequency direction or may be discontinuous.
- the LTE system uses a first component carrier (CC1) operated as a primary cell and a second component carrier (CC2) operated as a secondary cell.
- CC1 first component carrier
- CC2 second component carrier
- each subframe includes a control region (PDCCH region) used as a PDCCH and a control region (PDSCH region) used as a PDSCH.
- Each subframe includes a reference signal.
- the subframe in the first component carrier (CC1) includes a PDCCH region and a PDSCH region, and can transmit a control signal and user data. Accordingly, since the primary cell (first component carrier) can transmit a control signal, the primary cell alone can accommodate a user terminal.
- each subframe is a data region (PDSCH region) used as a PDSCH instead of a control region (PDCCH region) used as a PDCCH. )including.
- PDSCH region used as a PDSCH instead of a control region (PDCCH region) used as a PDCCH.
- Each subframe includes a reference signal.
- the subframe in the second component carrier does not include the PDCCH region and cannot transmit a control signal. Accordingly, since the secondary cell (second component carrier) cannot transmit a control signal, the secondary cell alone cannot accommodate a user terminal.
- FIG. 7 is a diagram for explaining the operating environment of the LTE system assumed in this embodiment. As shown in FIG. 7, the eNB 200-2 is installed adjacent to the eNB 200-1, and the eNB 200-3 is installed adjacent to the eNB 200-2.
- Each of the eNB 200-1, the eNB 200-2, and the eNB 200-3 supports carrier aggregation.
- each of the eNB 200-1, the eNB 200-2, and the eNB 200-3 can use the first component carrier (CC1) and the second component carrier (CC2).
- a moving route for example, a track of the transportation means T such as a train is provided.
- the transport traffic means T passes through the corresponding communication area in the order of eNB 200-1, eNB 200-2, and eNB 200-3.
- each of the eNB 200-1, the eNB 200-2, and the eNB 200-3 operates in a mode in which carrier aggregation is normally performed (hereinafter referred to as carrier aggregation mode).
- carrier aggregation mode a mode in which carrier aggregation is normally performed
- each of the eNB 200-1, the eNB 200-2, and the eNB 200-3 is a mode in which carrier aggregation is not performed (hereinafter referred to as a multi-UE mode) in a situation where the load level is high and the load level is expected to rise. Operate.
- the multi-UE mode can increase the number of UEs that can be accommodated by the eNB 200, although the transmission rate per UE is lower than that in the carrier aggregation mode.
- FIG. 8 is a configuration diagram of a radio frame when carrier aggregation is not applied in the downlink (that is, multi-UE mode).
- each subframe includes a control region (PDCCH region) used as a PDCCH and a control region (PDSCH region) used as a PDSCH. And including.
- Each subframe includes a reference signal.
- the eNB 200-1 operates in the multi-UE mode because the transportation means T is in its communication area and the load level is high.
- the eNB 200-1 sends a notification message about its own load level (hereinafter referred to as “Traffic Forecast message A”) to the eNB 200-2 on the X2 interface or the S1 interface in response to its own load level being high.
- Traffic Forecast message A corresponds to neighboring base station information.
- the eNB 200-2 When the eNB 200-2 receives the Traffic Forecast message A, the eNB 200-2 shifts to the multi-UE mode based on the Traffic Forecast message A. Specifically, the carrier configuration of the second component carrier (CC2) is changed so that the second component carrier (CC2) is operated as a primary cell.
- the eNB 200-2 uses the second component carrier (CC2) as a primary cell in preparation for the increase in the number of connected UEs. Change the carrier configuration to operate as As a result, when the number of connected UEs actually increases, the eNB 200-2 can absorb the increase in the number of connected UEs by using the primary cell corresponding to the second component carrier (CC2).
- CC2 second component carrier
- the eNB 200-1 predicts that the load level of the eNB 200-3 also increases, the eNB 200-1 transmits the Traffic Forecast message A to the eNB 200-3 on the X2 interface or the S1 interface.
- the eNB 200-1 may hold a list of eNBs (cells) that the eNB 200-1 should be the destination of the traffic forecast message A, or may be held by a higher-level network entity.
- FIG. 9 is a diagram for explaining a message configuration related to the traffic forecast message A according to the present embodiment.
- an example of transmitting the Traffic Forecast message A from the eNB 200-1 to the eNB 200-2 will be described.
- the Traffic Forecast message A includes a message ID for identifying the message type, a cell ID for identifying the transmission source, and a cell ID for identifying the transmission destination.
- the Traffic Forecast message A includes load information indicating a load level (for example, the number of connected UEs or a traffic amount) expected to increase in the eNB 200-2.
- the load level expected to increase in the eNB 200-2 can be the load level of the eNB 200-1 that has increased when the transportation means T enters the communication area of the eNB 200-1.
- the load information may be information indicating the current load level of the eNB 200-1.
- the Traffic Forecast message A includes duration information indicating a duration in which a high load level is maintained in the eNB 200-1.
- the eNB 200-1 measures the elapsed time (duration) from the time when the load level of the eNB 200 exceeds a predetermined level, and indicates the elapsed time at the time of transmission when transmitting the Traffic Forecast message A.
- the duration information is included in the Traffic Forecast message A.
- the duration information is used in the eNB 200-2 to determine the timing for changing the second component carrier (CC2) to the primary cell.
- the Traffic Forecast message A may include timeout time information indicating a timeout time to be compared with the duration.
- the eNB 200-2 determines whether or not the duration exceeds the timeout time based on the duration information and the timeout time information included in the Traffic Forecast message A, and at a timing when the duration exceeds the timeout time. Transition to UE mode.
- the traffic forecast response message which is a response to the traffic forecast message A, includes a message ID for identifying the message type, a cell ID for identifying the transmission source, and a cell ID for identifying the transmission destination. Including.
- FIG. 10 is an operation flowchart of the eNB 200-1 according to the present embodiment. Here, the operation of the eNB 200-1 regarding the transmission of the Traffic Forecast message A to the eNB 200-2 will be described.
- step S111 the eNB 200-1 determines whether or not its own load level exceeds a predetermined level.
- the eNB 200-1 starts a duration timer for measuring the duration.
- the eNB 200-1 acquires load information and duration information.
- the load information can be the load level of the eNB 200-1 that has increased when the transportation means T enters the communication area of the eNB 200-1.
- the load information may be information indicating the current load level of the eNB 200-1.
- the duration information may be a duration timer value.
- Step S113 the eNB 200-1 transmits the Traffic Forecast message A including the load information and duration information acquired in Step S112 to the eNB 200-2 on the X2 interface or the S1 interface.
- FIG. 11 is an operation flowchart of the eNB 200-2 according to the present embodiment.
- step S121 the eNB 200-2 determines whether or not the Traffic Forecast message A has been received.
- step S122 the eNB 200-2 determines that the sum of the load level of the eNB 200-2 and the load level indicated by the load state included in the received traffic forecast message A is a predetermined level. It is determined whether it exceeds. Alternatively, the eNB 200-2 may determine whether or not the load level indicated by the load state included in the received Traffic Forecast message A exceeds a predetermined level.
- step S123 the eNB 200-2 determines whether or not the duration indicated by the duration information included in the received Traffic Forecast message A exceeds the timeout time. If the received Traffic Forecast message A includes information indicating the timeout time, the timeout time may be set from the information. Alternatively, the timeout period may be set in advance based on the surrounding environment of the eNB 200-2.
- step S123 If the determination in step S123 is “YES”, the eNB 200-2 changes the carrier configuration to operate the second component carrier (CC2) as the primary cell. That is, the CA mode is shifted to the multi-UE mode.
- CC2 second component carrier
- the eNB 200-2 transmits an acknowledgment (ACK) as the above-mentioned Traffic Forecast response message when shifting to the multi-UE mode, and as the above-described Traffic Forecast response message when not shifting to the multi-UE mode.
- ACK acknowledgment
- NACK negative acknowledgment
- the eNB 200-2 allows the second component carrier (CC2) to prepare for a load level increase when its load level increase is expected from the Traffic Forecast message A. Can be changed to operate as a primary cell (ie, switching from CA mode to multi-UE mode). Therefore, when the load level of the eNB 200-2 actually increases, the eNB 200-2 can absorb the increase in the load level using the second component carrier (CC2) changed to the primary cell.
- CC2 the second component carrier
- the Traffic Forecast message A includes duration information indicating the duration of the state in which the load level of the eNB 200-1 exceeds a predetermined level.
- the eNB 200-2 can appropriately determine the timing for changing the carrier configuration of the second component carrier (CC2) by predicting the timing when the load level of the eNB 200-2 increases from the duration information.
- the switching from the CA mode to the multi-UE mode is controlled using the Traffic Forecast message A which is a new message, but the Traffic Forecast message A An existing message may be used instead.
- the sequence of FIG. 9 can be changed as follows.
- the eNB 200-2 transmits a Resource Status Request message requesting the report of the load level status (resource usage status) to the eNB 200-1 on the X2 interface.
- the Resource Status Request message includes information that specifies a reporting cycle.
- the eNB 200-1 periodically sends a Resource Status Update message including information indicating the load level status (resource usage status) on the X2 interface in response to the Resource Status Request message from the eNB 200-2. 2 to send.
- the eNB 200-2 is changed to operate the second component carrier (CC2) as a primary cell based on the Resource Status Request message from the eNB 200-2 (that is, from the CA mode to the multi-UE mode). Switch).
- CC2 the second component carrier
- the second embodiment is different from the first embodiment in that the subject of switching determination from the CA mode to the multi-UE mode is the eNB 200 on the message transmission side.
- the base station assigns the second component carrier to the adjacent base station based on the load level of the base station.
- Step A for transmitting a request message for requesting a change to be operated as
- “send a request message” is not limited to a case where a request message is transmitted directly to an adjacent base station, but a case where a request message is indirectly transmitted to an adjacent base station via an upper network entity. Including.
- the “neighboring base station” may be a concept including the next neighboring base station.
- the “change of the second component carrier” is not limited to the case where the carrier configuration is changed so that the entire second component carrier is operated as a primary cell, and only a part of the second component carrier is primary. This includes the case where the carrier configuration is changed to operate as a cell. In the former case, the carrier aggregation is stopped, but in the latter case, the carrier aggregation is partially continued.
- operating only a part of the second component carrier as a primary cell means that if there is one second component carrier, some subframes of one second component carrier are used as the primary cell. If there are a plurality of second component carriers, including operating, one second component carrier of the plurality of second component carriers is operated as a primary cell.
- the operation of the second component carrier in the adjacent base station can be changed to the primary cell in preparation for an increase in the load level.
- the adjacent base station can absorb the increase of the load level using the second component carrier changed to the primary cell. Therefore, the communication control method according to the second embodiment can appropriately operate a plurality of component carriers.
- the communication control method may further include a step B in which the base station determines a timing for transmitting the request message based on a duration in which the load level of the base station exceeds a predetermined level. Good. Thereby, the base station can predict the timing when the load level of the adjacent base station increases from the duration, and can appropriately determine the timing for transmitting the request message.
- the eNB 200-1 in the example of FIG. 7, the eNB 200-1 is operating in the multi-UE mode because the transportation means T is in its communication area and the load level is high.
- the eNB 200-1 requests a change message so as to operate the second component carrier (CC2) as a primary cell in accordance with the high load level of the eNB 200-1 (hereinafter referred to as “Traffic Forecast message B”).
- CC2 the second component carrier
- Traffic Forecast message B corresponds to neighboring base station information.
- the eNB 200-2 When the eNB 200-2 receives the Traffic Forecast message B, the eNB 200-2 shifts to the multi-UE mode based on the Traffic Forecast message B. Specifically, the carrier configuration of the second component carrier (CC2) is changed so that the second component carrier (CC2) is operated as a primary cell.
- the eNB 200-1 operates the second component carrier in the eNB 200-2 in preparation for the increase of the load level. It can be changed to the primary cell. Therefore, when the load level of the eNB 200-2 actually increases, the eNB 200-2 can absorb the increased load level using the additional primary cell.
- the eNB 200-1 When the eNB 200-1 predicts that the load level of the eNB 200-3 also increases, the eNB 200-1 transmits the Traffic Forecast message B to the eNB 200-3 on the X2 interface or the S1 interface.
- the eNB 200-1 may hold the list of eNBs (cells) that the eNB 200-1 should be the destination of the Traffic Forecast message B, or may be held by a higher-level network entity.
- FIG. 12 is a diagram for explaining a message configuration related to the traffic forecast message B according to the present embodiment.
- a Traffic Forecast message B is transmitted from the eNB 200-1 to the eNB 200-2 will be described.
- the Traffic Forecast message B includes a message ID for identifying the message type, a cell ID for identifying the transmission source, and a cell ID for identifying the transmission destination.
- the traffic forecast response message which is a response to the traffic forecast message B, includes a message ID for identifying the message type, a cell ID for identifying the transmission source, and a cell ID for identifying the transmission destination.
- FIG. 13 is an operation flowchart of the eNB 200-1 according to the present embodiment. Here, the operation of the eNB 200-1 regarding the transmission of the Traffic Forecast message B to the eNB 200-2 will be described.
- step S211 the eNB 200-1 determines whether or not its own load level exceeds a predetermined level.
- the eNB 200-1 starts a duration timer for measuring the duration.
- step S212 the eNB 200-1 determines whether or not the duration indicated by the duration timer exceeds the timeout time.
- the timeout time is set in advance based on the surrounding environment of the eNB 200-2.
- step S213 the eNB 200-1 sends a traffic forecast message B requesting a change to operate the second component carrier (CC2) as a primary cell to the X2 interface or the S1 interface. It transmits to eNB200-2 above.
- CC2 second component carrier
- FIG. 14 is an operation flowchart of the eNB 200-2 according to the present embodiment.
- step S221 the eNB 200-2 determines whether or not the Traffic Forecast message B has been received.
- step S222 the eNB 200-2 changes the carrier configuration to operate the second component carrier (CC2) as a primary cell. That is, the CA mode is shifted to the multi-UE mode.
- CC2 second component carrier
- the eNB 200-2 transmits an acknowledgment (ACK) as the above-described Traffic Forecast response message when shifting to the multi-UE mode, and if for any reason the eNB 200-2 does not shift to the multi-UE mode, the above-described Traffic Forecast.
- ACK acknowledgment
- NACK negative response
- the eNB 200-1 prepares for the increase of the load level.
- the operation of the second component carrier in can be changed to the primary cell. Therefore, when the load level of the eNB 200-2 actually increases, the eNB 200-2 can absorb the increased load level using the additional primary cell.
- the eNB 200-1 determines the timing for transmitting the Traffic Forecast message based on the duration of the state where the load level of the eNB 200-1 exceeds the threshold. Thereby, the eNB 200-1 can predict the timing at which the load level of the eNB 200-2 increases from the duration, and can appropriately determine the timing to transmit the Traffic Forecast message.
- the communication control method according to the third embodiment can appropriately operate a plurality of component carriers.
- Step A performs handover to the first component carrier for a user terminal that has established a connection with the second component carrier before the base station returns the carrier configuration of the second component carrier to the state before the change.
- Step A1 may be included to instruct to perform.
- step A sets the handover threshold so as to facilitate the handover to the first component carrier or another base station before the base station returns the carrier configuration of the second component carrier to the state before the change.
- Step A2 for adjusting may be included.
- step A may be configured to facilitate the handover to the first component carrier or another base station before the base station returns the carrier configuration of the second component carrier to the state before the change.
- Step A3 for reducing the transmission power in the component carrier may be included.
- FIG. 15 is a diagram for explaining the operating environment of the LTE system assumed in the present embodiment.
- the eNB 200-2 is installed adjacent to the eNB 200-1
- the eNB 200-3 is installed adjacent to the eNB 200-2.
- a moving route for example, a track
- the transport traffic means T passes through the corresponding communication area in the order of eNB 200-1, eNB 200-2, and eNB 200-3.
- the eNB 200-1 operates in the multi-UE mode because the transportation means T is in its communication area and the load level is high.
- the eNB 200-1 transmits the Traffic Forecast message A or the Traffic Forecast message B to the eNB 200-2 on the X2 interface or the S1 interface according to the high load level of the eNB 200-1.
- the eNB 200-2 receives the traffic forecast message A or the traffic forecast message B and then has the transportation means T in its communication area, and the load level is high. Operate in multi-UE mode.
- the eNB 200-2 transmits the Traffic Forecast message A or the Traffic Forecast message B to the eNB 200-3 on the X2 interface or the S1 interface according to the high load level of the eNB 200-2.
- the eNB 200-1 returns from the multi-UE mode to the CA mode because there is no transportation means T in its communication area and the load level is low.
- the eNB 200-3 receives the traffic forecast message A or the traffic forecast message B and then has the transportation means T in its communication area, and the load level is high. Operate in multi-UE mode. On the other hand, the eNB 200-2 returns from the multi-UE mode to the CA mode because there is no transportation means T in its communication area and the load level is low.
- both the first component carrier (CC1) and the second component carrier (CC2) are operated as the primary cell, and the second component carrier (CC2)
- the UE 100 can be accommodated alone (that is, the UE 100 can establish a connection).
- the second component carrier (CC2) since the second component carrier (CC2) is operated as a secondary cell, the second component carrier (CC2) alone cannot accommodate the UE 100 (that is, the UE 100 Connection cannot be established).
- the UE 100 that has established a connection with the second component carrier (CC2) switches from the multi-UE mode to the CA mode, the UE 100 can no longer maintain the connection and shifts from the connected state to the idle state. That is, the communication of the UE 100 that established the connection with the second component carrier (CC2) is interrupted.
- the eNB 200 before switching from the multi-UE mode to the CA mode, the eNB 200 establishes a connection with the second component carrier (CC2) and the UE 100 establishes a connection to the first component carrier (CC1) or another eNB 200. Control to perform handover.
- the multi-UE mode is switched to the CA mode. Since the UE 100 can maintain the connection state, the communication of the UE 100 is not interrupted.
- eNB200 is with respect to UE100 which established the connection by the 2nd component carrier (CC2) before returning the carrier structure of the 2nd component carrier (CC2) to the state before a change (secondary cell). And instructing to perform handover to the first component carrier (CC1).
- the eNB 200 performs handover to the first component carrier (CC1) or another eNB 200 before returning the carrier configuration of the second component carrier (CC2) to the state before the change (secondary cell).
- the handover threshold is a threshold that is compared with the reception power or reception quality of the reference signal in the UE 100.
- the handover to the first component carrier (CC1) is performed by adjusting the UE 100 so that the handover threshold compared with the reception power or reception quality of the reference signal received by the first component carrier (CC1) is lowered.
- Can promote
- the handover from the second component carrier (CC2) can be performed by adjusting the UE 100 so that the handover threshold compared with the reception power or reception quality of the reference signal received by the second component carrier (CC2) is increased. Can promote.
- the eNB 200 performs handover to the first component carrier (CC1) or another eNB 200 before returning the carrier configuration of the second component carrier (CC2) to the state before the change (secondary cell).
- the transmission power in the second component carrier (CC2) is reduced.
- the eNB 200 uses the second component carrier (CC2) after the UE 100 that establishes connection with the second component carrier (CC2) does not exist by at least one of the first method to the third method. Return the carrier configuration to the state before change (secondary cell). In the case of the second method and the third method, it is desirable to return the handover threshold value and the transmission power to the original when such a return operation is finished.
- FIG. 16 is an operation flowchart of the eNB 200 according to the present embodiment. In the initial state of this flow, it is assumed that the eNB 200 is operating in the multi-UE mode.
- step S301 the eNB 200 determines whether or not its own load level is lower than a predetermined level.
- step S302 the eNB 200 performs handover to the first component carrier (CC1) or another eNB 200 when the UE 100 having established a connection with the second component carrier (CC2). Processing to be performed, that is, at least one of the third method is started from the first method described above.
- step S303 the eNB 200 determines whether or not all the UEs 100 that have established connections with the second component carrier (CC2) have performed a handover.
- CC2 second component carrier
- step S304 the eNB 200 returns the carrier configuration of the second component carrier (CC2) to the state before the change (secondary cell). As a result, the eNB 200 returns from the multi-UE mode to the CA mode.
- CC2 the carrier configuration of the second component carrier
- the eNB 200 sets the first component carrier (CC2) to the UE 100 that has established a connection before returning the carrier configuration of the second component carrier (CC2) to the state before the change. Instruct to perform handover to the component carrier (CC1).
- the eNB 200 adjusts the handover threshold so as to facilitate the handover to the first component carrier (CC1) or another eNB 200 before returning the secondary cell carrier configuration to the state before the change, and / or The transmission power in the second component carrier (CC2) is reduced.
- NCT The fourth embodiment relates to an LTE system that supports NCT.
- NCT carrier a carrier to which NCT is applied
- LCT carrier a carrier to which LCT is applied
- NCT 17 and 18 are diagrams for explaining a specific example 1 of the NCT.
- FIG. 17 shows a carrier configuration of an LCT carrier as a comparative example
- FIG. 18 shows a carrier configuration of an NCT carrier.
- downlink reference signals are distributed and arranged in each subframe of the LCT carrier in the time axis direction and the frequency axis direction. Specifically, the downlink reference signal is arranged in all subframes in the time axis direction. Also, the downlink reference signal is arranged in all resource blocks (RB) in the frequency axis direction.
- CRS Cell-specific Reference Signal
- the downlink reference signal in the NCT carrier, is not arranged in all subframes in the time axis direction, but is arranged only in one of the two consecutive subframes.
- the downlink reference signal is not arranged in all RBs in the frequency axis direction, but is arranged only in one RB among two consecutive RBs.
- radio resources used for transmission of the downlink reference signal can be used for transmission of user data and the like. Throughput can be improved.
- NCT 19 and 20 are diagrams for explaining a specific example 2 of the NCT.
- FIG. 19 shows the carrier configuration of the LCT carrier
- FIG. 20 shows the carrier configuration of the NCT carrier.
- each of a plurality of subframes is provided with a PDCCH region for transmitting a downlink control signal.
- the PDCCH region is provided over all resource blocks in the section of the first few symbols of the subframe.
- an ePDCCH (enhanced PDCCH) region for transmitting a downlink control signal is provided.
- the ePDCCH region is composed of some resource blocks among a plurality of resource blocks included in a subframe.
- the ePDCCH region is provided only in a part of the resource blocks. Also, unlike the LCT in which the PDCCH region is provided only in the section of the first few symbols in the subframe, in the NCT, it is possible to provide the ePDCCH region over all the symbols in the subframe.
- the eNB 200 changes at least one carrier among a plurality of carriers operated by the eNB 200 from LCT to NCT based on neighboring base station information.
- the eNB 200 changes at least one carrier among a plurality of carriers operated by the eNB 200 from NCT to LCT based on the neighboring base station information.
- Adjacent base station information is information regarding the ability of the UE 100 to connect to the eNB 200 (adjacent base station) adjacent to the eNB 200.
- neighboring base station information includes UE 100 that does not support NCT (hereinafter referred to as “legacy UE”) and UE 100 that supports NCT (hereinafter referred to as “NCT supporting UE”) in a plurality of UEs 100 connected to the neighboring base station. .)).
- the information indicating the ratio between the legacy UE and the NCT support UE is, for example, one of the following.
- the eNB 200 changes the NCT carrier operated by the eNB 200 to an LCT carrier when the ratio of legacy UEs among the UEs 100 connected to the adjacent base station is large. Thereby, even if the legacy UE moves in a large amount from the area of the adjacent base station to the area of the eNB 200, more legacy UEs can be accommodated by the LCT carrier.
- the mode in which the eNB 200 operates all or most of the plurality of carriers as the LCT carrier is referred to as “legacy UE priority mode”.
- the eNB 200 changes the LCT carrier operated by the eNB 200 to the NCT carrier when the ratio of the NCT support UE is large among the UEs 100 connected to the adjacent base station. Thereby, even if the NCT support UE moves in a large amount from the area of the adjacent base station to the area of the eNB 200, more NCT support UEs can be accommodated by the NCT carrier.
- NCT support UE priority mode the mode in which the eNB 200 operates all or most of the plurality of carriers as NCT carriers.
- FIG. 21 is a diagram for explaining a traffic forecast message C (adjacent base station information) according to the present embodiment.
- the Traffic Forecast message C is transmitted from the eNB 200-1 to the eNB 200-2.
- the traffic forecast message C is information indicating the ratio between the legacy UE and the NCT support UE in the UE 100 connected to the eNB 200-1 (hereinafter referred to as “legacy”). / NCT ratio information ”). Other message configurations are the same as in the first embodiment.
- the eNB 200-1 may transmit the Traffic Forecast message C to the eNB 200-2 triggered by the ratio of legacy UEs exceeding the threshold.
- the eNB 200-1 may transmit the Traffic Forecast message C to the eNB 200-2 triggered by the ratio of NCT supporting UEs exceeding the threshold.
- FIG. 22 is an operation flowchart of the eNB 200-1 according to the present embodiment. Here, the operation of the eNB 200-1 regarding the transmission of the Traffic Forecast message C to the eNB 200-2 will be described.
- the eNB 200-1 acquires capability information from each of the plurality of UEs 100 connected to the eNB 200-1, and determines whether or not the ratio of legacy UEs exceeds the threshold value.
- the capability information includes information on whether or not to support NCT.
- the eNB 200-1 starts a duration timer for measuring the duration.
- step S412 the eNB 200-1 acquires legacy / NCT ratio information and duration information.
- the duration information can be the value of the duration timer as in the first embodiment.
- Step S413 the eNB 200-1 transmits the Traffic Forecast message C including the legacy / NCT ratio information and the duration information acquired in Step S412 to the eNB 200-2 on the X2 interface or the S1 interface.
- FIG. 23 is an operation flowchart of the eNB 200-2 according to the present embodiment.
- the eNB 200-2 operates in the NCT support UE priority mode.
- step S421 the eNB 200-2 determines whether or not the Traffic Forecast message C has been received.
- step S422 the eNB 200-2 indicates the legacy UE ratio connected to the eNB 200-2 and the legacy / NCT ratio state included in the received Traffic Forecast message C. It is determined whether or not the sum of the UE ratio exceeds a threshold value. Or eNB200-2 may determine whether the ratio of the legacy UE which the legacy / NCT ratio state contained in the received Traffic Forecast message C shows exceeds a threshold value.
- step S423 determines whether or not the duration indicated by the duration information included in the received traffic forecast message C exceeds the timeout time. If the received traffic forecast message C includes information indicating the timeout time, the timeout time may be set from the information. Alternatively, the timeout period may be set in advance based on the surrounding environment of the eNB 200-2.
- step S423 the eNB 200-2 transitions to the legacy UE priority mode.
- the eNB 200-2 transmits an acknowledgment (ACK) as the above-described Traffic Forecast response message when shifting to the legacy UE priority mode, and when not shifting to the legacy UE priority mode, the eNB 200-2 described above, the Traffic Forecast Response described above.
- ACK acknowledgment
- NACK negative acknowledgment
- FIG. 24 is a diagram for explaining a specific example 1 of the operation according to the present embodiment. Here, a case where a transition from the NCT support UE priority mode to the legacy UE priority mode is performed will be described.
- the eNB 200-2 is installed adjacent to the eNB 200-1
- the eNB 200-3 is installed adjacent to the eNB 200-2.
- a moving route for example, a track
- the transport traffic means T passes through the corresponding communication area in the order of eNB 200-1, eNB 200-2, and eNB 200-3.
- the eNB 200-1 is operating in the legacy UE priority mode because there is a large proportion of legacy UEs in its communication area.
- the eNB 200-1 transmits the Traffic Forecast message C to the eNB 200-2 on the X2 interface or the S1 interface in response to the large percentage of legacy UEs.
- the eNB 200-2 after receiving the Traffic Forecast message C, has the transport means T in its communication area and has a large proportion of legacy UEs. Transition from the UE priority mode to the legacy UE priority mode.
- the eNB 200-2 transmits the Traffic Forecast message C to the eNB 200-3 on the X2 interface or the S1 interface in response to the large percentage of legacy UEs.
- the eNB 200-1 returns to the NCT support UE priority mode because the transportation means T does not exist in its own communication area and the ratio of legacy UEs is small.
- the eNB 200-3 after receiving the Traffic Forecast message C, has the transport means T in its communication area and has a large proportion of legacy UEs. Transition from the UE priority mode to the legacy UE priority mode. On the other hand, the eNB 200-2 returns to the NCT support UE priority mode because the transportation means T does not exist in its own communication area and the ratio of legacy UEs is small.
- FIG. 25 is a diagram for explaining a specific example 2 of the operation according to the present embodiment. Here, a case where a transition from the legacy UE priority mode to the NCT support UE priority mode is performed will be described.
- the eNB 200-2 is installed adjacent to the eNB 200-1
- the eNB 200-3 is installed adjacent to the eNB 200-2.
- a moving route for example, a track
- the transport traffic means T passes through the corresponding communication area in the order of eNB 200-1, eNB 200-2, and eNB 200-3.
- the eNB 200-1 is operating in the NCT support UE priority mode because the ratio of the NCT support UE is large in its communication area.
- the eNB 200-1 transmits the Traffic Forecast message C to the eNB 200-2 on the X2 interface or the S1 interface in response to the high ratio of NCT support UEs.
- the eNB 200-2 after receiving the Traffic Forecast message C, has a transportation means T in its communication area and has a high ratio of NCT support UEs. Transition from UE priority mode to NCT support UE priority mode.
- the eNB 200-2 transmits the Traffic Forecast message C to the eNB 200-3 on the X2 interface or the S1 interface in response to the large proportion of NCT support UEs.
- the eNB 200-1 returns to the legacy UE priority mode because there is no transport means T in its communication area and the ratio of NCT support UEs is small.
- the eNB 200-3 after receiving the Traffic Forecast message C, has a transportation means T in its communication area and has a high ratio of NCT support UEs. Transition from UE priority mode to NCT support UE priority mode. On the other hand, the eNB 200-2 returns to the legacy UE priority mode because the transportation means T does not exist in its own communication area and the ratio of NCT support UEs is small.
- the switching between the legacy UE priority mode and the NCT support UE priority mode may be determined by the eNB 200 on the transmission side of the Traffic Forecast message C.
- the Traffic Forecast message C transmitted from the eNB 200 to the neighboring base station is information based on the capability of the UE 100 connected to the eNB 200, and changes at least one carrier of the neighboring base station from LCT to NCT. It is information requesting that. That is, the Traffic Forecast message C transmitted from the eNB 200 to the adjacent base station is information requesting the adjacent base station to shift from the legacy UE priority mode to the NCT support UE priority mode.
- the Traffic Forecast message C transmitted from the eNB 200 to the neighboring base station is information based on the capability of the UE 100 connected to the eNB 200, and requests that at least one carrier of the neighboring base station be changed from NCT to LCT. Information. That is, the Traffic Forecast message C transmitted from the eNB 200 to the adjacent base station is information requesting the adjacent base station to shift from the NCT support UE priority mode to the legacy UE priority mode.
- the present invention can appropriately operate a plurality of carriers, it is useful in the field of wireless communication such as mobile communication.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
以下において、第1実施形態について説明する。
本実施形態に係る通信制御方法は、基地局が、該基地局の負荷レベルに関する通知メッセージを隣接基地局に送信するステップAと、隣接基地局が、通知メッセージに基づいて、第2のコンポーネントキャリアをプライマリセルとして運用するように第2のコンポーネントキャリアのキャリア構成を変更するステップBと、を有する。
図1は、本実施形態に係る移動通信システムの構成図である。本実施形態に係る移動通信システムは、LTE Advanced(3GPPリリース10以降)に基づいて構成されるLTEシステムである。
以下、本実施形態に係るLTEシステムがサポートするキャリアアグリゲーションにおけるキャリア構成を説明する。下りリンクにおけるキャリアアグリゲーションを例に説明するが、本発明は下りリンクに限定されるものではない。
以下において、本実施形態に係るLTEシステムの動作を説明する。
本実施形態によれば、eNB200-2は、自身の負荷レベル上昇がTraffic ForecastメッセージAから予想される場合に、負荷レベル上昇に備えて、第2のコンポーネントキャリア(CC2)をプライマリセルとして運用するように変更(すなわち、CAモードから多UEモードへの切り替え)ができる。よって、eNB200-2は、自身の負荷レベルが実際に増加した際、プライマリセルに変更した第2のコンポーネントキャリア(CC2)を用いて、負荷レベルの上昇分を吸収できる。
第1実施形態では、新規メッセージであるTraffic ForecastメッセージAを利用してCAモードから多UEモードへの切り替えを制御していたが、Traffic ForecastメッセージAに代えて既存メッセージを利用してもよい。具体的には、図9のシーケンスは以下のように変更できる。
以下において、第2実施形態について、第1実施形態との相違点を主として説明する。第2実施形態は、CAモードから多UEモードへの切り替え判断の主体が、メッセージ送信側のeNB200である点で、第1実施形態とは異なっている。
本実施形態に係る通信制御方法は、基地局が、該基地局の負荷レベルに基づいて、隣接基地局に対して、第2のコンポーネントキャリアをプライマリセルとして運用するよう変更を要求する要求メッセージを送信するステップAを有する。
本実施形態で想定するLTEシステムの動作環境は、第1実施形態(図7)と同様である。
本実施形態によれば、eNB200-1は、eNB200-2の負荷レベルが上昇することが自身の負荷レベルから予想される場合に、負荷レベルの上昇に備えてeNB200-2における第2のコンポーネントキャリアの運用をプライマリセルに変更させることができる。よって、eNB200-2は、自身の負荷レベルが実際に上昇した際、追加のプライマリセルを用いて負荷レベルの上昇分を吸収できる。
以下、第3実施形態について、第1実施形態及び第2実施形態との相違点を説明する。第1実施形態及び第2実施形態は、CAモードから多UEモードへの切り替え(移行)に関する実施形態であったが、第3実施形態は、多UEモードからCAモードへの切り替え(復帰)に関する実施形態である。
本実施形態に係る通信制御方法は、基地局が、第2のコンポーネントキャリアをプライマリセルとして運用するよう第2のコンポーネントキャリアのキャリア構成を変更した後、基地局の負荷レベルに基づいて、第2のコンポーネントキャリアのキャリア構成を変更前の状態に戻すステップAを有する。
図15は、本実施形態で想定するLTEシステムの動作環境を説明するための図である。
本実施形態によれば、eNB200は、第2のコンポーネントキャリア(CC2)をプライマリセルとして運用するよう変更した後、自身の負荷レベルが十分に減少したのであれば、第2のコンポーネントキャリア(CC2)を変更前の状態(セカンダリセル)に戻すことで、キャリアアグリゲーションを良好に機能させることができる。
以下において、第4実施形態について、第1実施形態~第3実施形態との相違点を主として説明する。
第4実施形態は、NCTをサポートするLTEシステムに関する。
図17及び図18は、NCTの具体例1を説明するための図である。図17は、比較例としてのLCTキャリアのキャリア構成を示し、図18は、NCTキャリアのキャリア構成を示す。
図19及び図20は、NCTの具体例2を説明するための図である。図19は、LCTキャリアのキャリア構成を示し、図20は、NCTキャリアのキャリア構成を示す。
本実施形態では、eNB200は、隣接基地局情報に基づいて、eNB200が運用する複数のキャリアのうち少なくとも1つのキャリアを、LCTからNCTに変更する。或いは、eNB200は、隣接基地局情報に基づいて、eNB200が運用する複数のキャリアのうち少なくとも1つのキャリアを、NCTからLCTに変更する。
・レガシーUE数及びNCTサポートUE数から算出された比。
・レガシーUE数及びNCTサポートUE数の組み合わせ。
・隣接基地局と接続するUE100の総数及びレガシーUE数の組み合わせ。
・隣接基地局と接続するUE100の総数及びNCTサポートUE数の組み合わせ。
図21は、本実施形態に係るTraffic ForecastメッセージC(隣接基地局情報)を説明するための図である。ここでは、eNB200-1からeNB200-2へTraffic ForecastメッセージCを送信する一例を説明する。
上述した第4実施形態では、レガシーUE優先モードとNCTサポートUE優先モードとの間の切り替えを、Traffic ForecastメッセージCの受信側のeNB200において判断していた。
上記のように、本発明は実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。
Claims (18)
- 複数のキャリアを無線通信に使用する基地局であって、
隣接基地局から送信される情報であって、かつ前記隣接基地局と接続するユーザ端末に関する隣接基地局情報を受信する受信部と、
前記隣接基地局情報に基づいて、前記複数のキャリアのうち少なくとも1つのキャリアのキャリア構成を変更する制御部と、
を備えることを特徴とする基地局。 - 前記複数のキャリアは、制御信号及びユーザデータを伝送するプライマリセルとして運用される第1のコンポーネントキャリアと、ユーザデータを伝送するセカンダリセルとして運用される第2のコンポーネントキャリアと、を含み、
前記制御部は、前記隣接基地局情報に基づいて、前記第2のコンポーネントキャリアを前記プライマリセルとして運用するように前記第2のコンポーネントキャリアのキャリア構成を変更することを特徴とする請求項1に記載の基地局。 - 前記隣接基地局情報は、前記隣接基地局の負荷レベルを示す情報であることを特徴とする請求項2に記載の基地局。
- 前記隣接基地局情報は、前記隣接基地局の負荷レベルが所定レベルを上回る状態の持続時間を示す持続時間情報を含むことを特徴とする請求項3に記載の基地局。
- 前記制御部は、前記持続時間が所定時間を上回る場合に、前記第2のコンポーネントキャリアを前記プライマリセルとして運用するように前記第2のコンポーネントキャリアのキャリア構成を変更することを特徴とする請求項4に記載の基地局。
- 前記隣接基地局情報は、前記隣接基地局の負荷レベルに基づく情報であって、かつ前記第2のコンポーネントキャリアを前記プライマリセルとして運用するよう変更を要求する情報であることを特徴とする請求項2に記載の基地局。
- 前記隣接基地局における前記隣接基地局情報の送信タイミングは、前記隣接基地局の負荷レベルが所定レベルを上回る状態の持続時間に基づいて決定されることを特徴とする請求項6に記載の基地局。
- 前記制御部は、前記第2のコンポーネントキャリアを前記プライマリセルとして運用するよう前記第2のコンポーネントキャリアのキャリア構成を変更した後、前記基地局の負荷レベルに基づいて、前記第2のコンポーネントキャリアのキャリア構成を変更前の状態に戻すことを特徴とする請求項2に記載の基地局。
- 前記制御部は、前記第2のコンポーネントキャリアのキャリア構成を前記変更前の状態に戻す前に、前記第2のコンポーネントキャリアで接続を確立したユーザ端末に対して前記第1のコンポーネントキャリアへのハンドオーバを行うよう指示することを特徴とする請求項8に記載の基地局。
- 前記制御部は、前記第2のコンポーネントキャリアのキャリア構成を前記変更前の状態に戻す前に、前記第1のコンポーネントキャリア又は他の基地局へのハンドオーバを促進するようにハンドオーバ閾値を調整することを特徴とする請求項8に記載の基地局。
- 前記制御部は、前記第2のコンポーネントキャリアのキャリア構成を前記変更前の状態に戻す前に、前記第1のコンポーネントキャリア又は他の基地局へのハンドオーバを促進するように前記第2のコンポーネントキャリアにおける送信電力を低下させることを特徴とする請求項8に記載の基地局。
- 前記隣接基地局情報は、前記隣接基地局と接続するユーザ端末の能力に関する情報であることを特徴とする請求項1に記載の基地局。
- 前記制御部は、前記隣接基地局情報に基づいて、前記複数のキャリアのうち少なくとも1つのキャリアを、従来型キャリア構成から新型キャリア構成に変更することを特徴とする請求項12に記載の基地局。
- 前記制御部は、前記隣接基地局情報に基づいて、前記複数のキャリアのうち少なくとも1つのキャリアを、新型キャリア構成から従来型キャリア構成に変更することを特徴とする請求項12に記載の基地局。
- 前記隣接基地局情報は、前記隣接基地局と接続する複数のユーザ端末において、新型キャリア構成をサポートしないユーザ端末と前記新型キャリア構成をサポートするユーザ端末との比を示す情報であることを特徴とする請求項12に記載の基地局。
- 前記隣接基地局情報は、前記隣接基地局と接続するユーザ端末の能力に基づく情報であって、かつ前記少なくとも1つのキャリアを従来型キャリア構成から新型キャリア構成に変更することを要求する情報であることを特徴とする請求項13に記載の基地局。
- 前記隣接基地局情報は、前記隣接基地局と接続するユーザ端末の能力に基づく情報であって、かつ前記少なくとも1つのキャリアを新型キャリア構成から従来型キャリア構成に変更することを要求する情報であることを特徴とする請求項13に記載の基地局。
- 複数のキャリアを無線通信に使用する基地局において用いられる通信制御方法であって、
隣接基地局から送信される情報であって、かつ前記隣接基地局と接続するユーザ端末に関する隣接基地局情報を受信するステップと、
前記隣接基地局情報に基づいて、前記複数のキャリアのうち少なくとも1つのキャリアのキャリア構成を変更するステップと、
を備えることを特徴とする通信制御方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/416,833 US9961687B2 (en) | 2012-07-27 | 2013-07-23 | Base station and communication control method |
JP2014526935A JP6030134B2 (ja) | 2012-07-27 | 2013-07-23 | 基地局及び通信制御方法 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261676724P | 2012-07-27 | 2012-07-27 | |
US201261676737P | 2012-07-27 | 2012-07-27 | |
US201261676755P | 2012-07-27 | 2012-07-27 | |
US61/676,724 | 2012-07-27 | ||
US61/676,737 | 2012-07-27 | ||
US61/676,755 | 2012-07-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014017478A1 true WO2014017478A1 (ja) | 2014-01-30 |
Family
ID=49997288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/069903 WO2014017478A1 (ja) | 2012-07-27 | 2013-07-23 | 基地局及び通信制御方法 |
Country Status (3)
Country | Link |
---|---|
US (1) | US9961687B2 (ja) |
JP (2) | JP6030134B2 (ja) |
WO (1) | WO2014017478A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016039378A (ja) * | 2014-08-05 | 2016-03-22 | 日本電気株式会社 | 情報処理装置、制御装置、情報処理装置の制御方法 |
US9363822B1 (en) * | 2014-06-26 | 2016-06-07 | Sprint Spectrum L.P. | Method and system for assigning resources to user equipment devices (UEs) |
JP2018164238A (ja) * | 2017-03-27 | 2018-10-18 | Kddi株式会社 | 通信端末及び基地局 |
WO2019138520A1 (ja) * | 2018-01-11 | 2019-07-18 | 富士通株式会社 | 無線通信システム、端末、通信方法、制御装置、無線装置およびユーザデータ処置装置 |
US11044583B2 (en) | 2016-10-28 | 2021-06-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Advanced switching policies for eMBMS mood |
WO2023171198A1 (ja) * | 2022-03-08 | 2023-09-14 | 日本電気株式会社 | Ranノード及び方法 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2882245A4 (en) * | 2012-08-02 | 2016-03-16 | Mitsubishi Electric Corp | COMMUNICATION SYSTEM |
US9445410B2 (en) * | 2012-08-03 | 2016-09-13 | Qualcomm Incorporated | Communicating with an enhanced new carrier type |
WO2014208351A1 (ja) * | 2013-06-26 | 2014-12-31 | 京セラ株式会社 | 通信制御方法 |
CN104602349B (zh) * | 2013-10-31 | 2020-01-03 | 索尼公司 | 载波分配装置和方法、以及终端 |
US10405278B2 (en) | 2014-10-31 | 2019-09-03 | Qualcomm Incorporated | Low power scheduling |
US10462705B1 (en) * | 2015-05-13 | 2019-10-29 | Sprint Spectrum L.P. | Systems and methods for preventing premature processing during beam forming |
US11140582B2 (en) * | 2019-10-25 | 2021-10-05 | T-Mobile Usa, Inc. | Wireless band priority metrics analysis and response |
US11310714B1 (en) * | 2020-03-27 | 2022-04-19 | T-Mobile Innovations Llc | Load balancing based on pairing efficiency |
GB2596118B (en) | 2020-06-18 | 2022-07-20 | British Telecomm | Cellular telecommunications network |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009017168A1 (ja) * | 2007-07-31 | 2009-02-05 | Ntt Docomo, Inc. | 移動通信システムにおける基地局装置及び方法 |
JP2011045058A (ja) * | 2009-08-19 | 2011-03-03 | Ntt Docomo Inc | セル間干渉協調方法及び基地局 |
WO2011052643A1 (ja) * | 2009-10-29 | 2011-05-05 | 日本電気株式会社 | 無線通信システム、無線通信方法、無線局、およびプログラム |
WO2012147884A1 (ja) * | 2011-04-26 | 2012-11-01 | 京セラ株式会社 | 基地局及びその制御方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005236463A (ja) * | 2004-02-18 | 2005-09-02 | Hitachi Ltd | ハンドオーバ方法 |
US8706132B2 (en) * | 2009-03-13 | 2014-04-22 | Nec Corporation | Radio communication system, base station, mobile station, control method of base station, control method of mobile station, and storage medium storing program |
WO2011108637A1 (ja) * | 2010-03-05 | 2011-09-09 | シャープ株式会社 | 無線通信システム、基地局装置、通信装置、及び通信制御プログラム |
EP2375850B1 (en) * | 2010-04-06 | 2016-09-07 | Alcatel Lucent | Controlling communications in a multi-carrier wireless communication system |
CN102238666B (zh) * | 2010-04-30 | 2015-10-21 | 中兴通讯股份有限公司 | 多载波切换处理方法及系统 |
JP5396330B2 (ja) * | 2010-04-30 | 2014-01-22 | 株式会社Nttドコモ | 移動通信方法、移動局及び無線基地局 |
KR101467965B1 (ko) * | 2010-05-03 | 2014-12-10 | 알까뗄 루슨트 | 반송파 집성을 갖는 무선 통신 네트워크에서 이용된 핸드오버 방법 및 그의 장치 |
JP2012009945A (ja) * | 2010-06-22 | 2012-01-12 | Sharp Corp | 無線通信システム、基地局装置および通信方法 |
KR101699023B1 (ko) * | 2010-07-14 | 2017-01-23 | 주식회사 팬택 | 다중 요소 반송파 시스템에서 핸드오버의 수행장치 및 방법 |
US9326231B2 (en) * | 2011-09-26 | 2016-04-26 | Lg Electronics Inc. | Method and apparatus for selecting cell in wireless communication system |
US9338785B2 (en) * | 2012-05-10 | 2016-05-10 | Nokia Solutions And Networks Oy | System performance |
CN107248906B (zh) * | 2012-06-28 | 2023-03-10 | 华为技术有限公司 | 辅助主小区的调整方法以及基站 |
-
2013
- 2013-07-23 WO PCT/JP2013/069903 patent/WO2014017478A1/ja active Application Filing
- 2013-07-23 US US14/416,833 patent/US9961687B2/en active Active
- 2013-07-23 JP JP2014526935A patent/JP6030134B2/ja active Active
-
2016
- 2016-08-22 JP JP2016161789A patent/JP6174212B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009017168A1 (ja) * | 2007-07-31 | 2009-02-05 | Ntt Docomo, Inc. | 移動通信システムにおける基地局装置及び方法 |
JP2011045058A (ja) * | 2009-08-19 | 2011-03-03 | Ntt Docomo Inc | セル間干渉協調方法及び基地局 |
WO2011052643A1 (ja) * | 2009-10-29 | 2011-05-05 | 日本電気株式会社 | 無線通信システム、無線通信方法、無線局、およびプログラム |
WO2012147884A1 (ja) * | 2011-04-26 | 2012-11-01 | 京セラ株式会社 | 基地局及びその制御方法 |
Non-Patent Citations (1)
Title |
---|
ERICSSON: "Support for carrier aggregation", 3GPP TSG-RAN WG3 #63-BIS TDOC, R3-090920, March 2009 (2009-03-01), pages 1 - 2 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9363822B1 (en) * | 2014-06-26 | 2016-06-07 | Sprint Spectrum L.P. | Method and system for assigning resources to user equipment devices (UEs) |
JP2016039378A (ja) * | 2014-08-05 | 2016-03-22 | 日本電気株式会社 | 情報処理装置、制御装置、情報処理装置の制御方法 |
US11044583B2 (en) | 2016-10-28 | 2021-06-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Advanced switching policies for eMBMS mood |
JP2018164238A (ja) * | 2017-03-27 | 2018-10-18 | Kddi株式会社 | 通信端末及び基地局 |
WO2019138520A1 (ja) * | 2018-01-11 | 2019-07-18 | 富士通株式会社 | 無線通信システム、端末、通信方法、制御装置、無線装置およびユーザデータ処置装置 |
WO2023171198A1 (ja) * | 2022-03-08 | 2023-09-14 | 日本電気株式会社 | Ranノード及び方法 |
Also Published As
Publication number | Publication date |
---|---|
JP6030134B2 (ja) | 2016-11-24 |
US9961687B2 (en) | 2018-05-01 |
US20150208420A1 (en) | 2015-07-23 |
JPWO2014017478A1 (ja) | 2016-07-11 |
JP2017011722A (ja) | 2017-01-12 |
JP6174212B2 (ja) | 2017-08-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6174212B2 (ja) | 基地局 | |
JP6382467B2 (ja) | 無線基地局、ユーザ端末及びプロセッサ | |
JP5826937B2 (ja) | 移動通信システム、基地局、ユーザ端末、及びプロセッサ | |
JP6282656B2 (ja) | ユーザ端末、無線アクセスネットワーク、及び通信制御方法 | |
WO2015005316A1 (ja) | ネットワーク装置及び通信制御方法 | |
US9719383B2 (en) | Network device and communication control method | |
WO2014126255A1 (ja) | 基地局及び通信制御方法 | |
JP5852261B2 (ja) | 移動通信システム、ユーザ端末、基地局、プロセッサ及び通信制御方法 | |
WO2018173805A1 (ja) | 通信制御方法及び無線端末 | |
JP2015033124A (ja) | ユーザ端末、セルラ基地局、及びプロセッサ | |
JP6158309B2 (ja) | 基地局、プロセッサ、及び通信制御方法 | |
WO2015002232A1 (ja) | ネットワーク装置及びユーザ端末 | |
WO2018173677A1 (ja) | 通信制御方法、無線端末、及び基地局 | |
JP6034956B2 (ja) | 移動通信システム、基地局及びユーザ端末 | |
JP6166343B2 (ja) | 通信制御方法、基地局及びユーザ端末 | |
US20160057792A1 (en) | Mobile communication system, base station, and user terminal | |
JP6781692B2 (ja) | 通信装置及び通信方法 | |
JP2014220777A (ja) | 通信制御方法及びセルラ基地局 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13823818 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2014526935 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14416833 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13823818 Country of ref document: EP Kind code of ref document: A1 |