WO2015080080A1 - 通信制御方法及び基地局 - Google Patents
通信制御方法及び基地局 Download PDFInfo
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- WO2015080080A1 WO2015080080A1 PCT/JP2014/081049 JP2014081049W WO2015080080A1 WO 2015080080 A1 WO2015080080 A1 WO 2015080080A1 JP 2014081049 W JP2014081049 W JP 2014081049W WO 2015080080 A1 WO2015080080 A1 WO 2015080080A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/248—Connectivity information update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a communication control method and a base station used in a mobile communication system.
- 3GPP 3rd Generation Partnership Project
- a power saving (energy saving) technology for reducing power consumption of a network is introduced (for example, see Non-Patent Document 1).
- the cell managed by the base station is turned off (Deactivate) at night when communication traffic is low.
- improved energy saving technology will be introduced after Release 12.
- the transmission power of the neighboring cell is increased.
- the coverage of the neighboring cell can be expanded (cell expansion), and the coverage of the cell to be turned off can be supplemented (area supplement).
- the base station that operates the expanded cell starts to newly manage the area supplemented area, so the situation of the area supplemented area is unknown. Therefore, the base station cannot appropriately operate a cell with extended coverage, and there is a possibility that the network efficiency is lowered.
- an object of the present invention is to provide a communication control method and a base station that can suppress a decrease in network efficiency when energy saving technology is introduced.
- a communication control method includes: an off-target base station that attempts to turn off an off-target cell that is its own cell; and an extension-target base station that is to perform cell expansion to supplement the off-target cell. Used in mobile communication systems.
- the off-target base station transmits list information used when operating the off-target cell and held by the off-target base station to the extension target base station before the cell expansion is performed. And an operation step in which the extension target base station operates an extension target cell whose coverage is extended based on the list information.
- FIG. 1 is a configuration diagram of an LTE system.
- FIG. 2 is a block diagram of the UE.
- FIG. 3 is a block diagram of the eNB.
- FIG. 4 is a protocol stack diagram of a radio interface in the LTE system.
- FIG. 5 is a configuration diagram of a radio frame used in the LTE system.
- FIG. 6 is a diagram illustrating a data path in cellular communication.
- FIG. 7 is a diagram illustrating a data path in D2D communication.
- FIG. 8 is a sequence diagram for explaining an operation of deleting from the fixed UE list according to the present embodiment.
- FIG. 9 is a flowchart for explaining an operation of deleting from the fixed UE list according to the present embodiment.
- FIG. 1 is a configuration diagram of an LTE system.
- FIG. 2 is a block diagram of the UE.
- FIG. 3 is a block diagram of the eNB.
- FIG. 4 is a protocol stack diagram of a radio interface in the
- FIG. 10 is an explanatory diagram for explaining the operating environment of the mobile communication system according to the first embodiment.
- FIG. 11 is a sequence diagram for explaining an operation at the start of energy saving according to the first embodiment.
- FIG. 12 is a flowchart for explaining the operation at the end of the energy saving according to the first embodiment.
- FIG. 13 is an explanatory diagram for explaining an operation according to the modified example of the present embodiment.
- FIG. 14 is a sequence (part 1) for explaining the operation of the eNB 200 according to the second embodiment.
- FIG. 15 is a sequence (part 2) for explaining the operation of the eNB 200 according to the second embodiment.
- FIG. 16 is an explanatory diagram for explaining an operation of the UE 101 according to the second embodiment.
- FIG. 17 is an explanatory diagram for explaining an operation of the UE 101 according to the second embodiment.
- FIG. 18 is a sequence diagram for explaining the operation of the UE 101 according to the second embodiment.
- FIG. 19 is a sequence diagram for explaining the operation of the UE 101 according to the second embodiment.
- a communication control method includes: an off-target base station that attempts to turn off an off-target cell that is its own cell; and an extension-target base station that should perform cell expansion to complement the off-target cell Used in communication systems.
- the off-target base station uses the list information that is used when the off-target cell operates to hold the list information held by the off-target base station before the cell extension is performed.
- the list information is information indicating a list broadcast or unicast within the coverage of the off-target cell by the off-target base station, and the operation step includes: Broadcasting or unicasting the list information within the coverage of the extension target cell.
- the communication control method further includes a step in which the extension target base station deletes the list information or returns the list information to the off target base station after completing the operation step.
- the operation step includes a step in which the extension target base station updates the list information.
- the communication control method further includes a step of the extension target base station holding the list information updated for the next cell extension after the operation step is completed.
- the list information is information indicating a list related to a fixed node that exists in the off target cell and whose position is fixed.
- the operation step includes the step of the expansion target base station confirming whether or not the fixed node registered in the list information exists within the coverage of the expansion target cell; A station is registered in the list information and deletes information of a fixed node that does not exist in the coverage of the extension target cell.
- the fixed node is a fixed type user terminal that transmits information using a wireless LAN access point or a D2D proximity service (D2D communication that is direct inter-terminal communication).
- D2D communication that is direct inter-terminal communication
- the fixed node is a fixed user terminal whose movement is restricted.
- the communication control method includes the step of receiving capability information including information capable of determining whether or not the off target base station is a fixed user terminal from a user terminal residing in the off target cell; Based on the capability information received from the user terminal, the target base station determines whether the user terminal is the fixed user terminal, and the off-target base station determines the determination step. And updating a list relating to the fixed type user terminal based on the determination result.
- the off-target base station continues to be in the off-target cell until the off-target cell is turned off, and when the off-state of the off-target cell ends.
- the expansion target base station continues to be present in the expansion target cell while the expansion target cell is expanded, and the expansion target cell is expanded when the expansion target cell is expanded.
- the method further includes a determination step of determining that a user terminal whose number of handovers to the target cell exceeds a threshold value is a fixed user terminal whose movement is restricted.
- the extension target base station updates a list relating to the fixed type user terminal based on a determination result of the determination step.
- the off-target base station transmits user information related to user terminals located in the off-target cell before the cell extension is performed
- the extension target base station includes: And a securing step of securing, for the user terminal, an expansion target cell resource used after the cell expansion is performed based on the user information.
- the user terminal receives the extension target cell resource before the off target cell is turned off, and the user terminal extends the extension target cell. And an operation step of operating using the resource for extension target cell while being in the extension target cell.
- the resource for extension target cell is a temporary identifier used to identify the user terminal within the coverage of the extension target cell, and in the operation step, the user terminal After the expansion, when the mobile station is located in the expansion target cell, the random access procedure for connecting to the expansion target cell is omitted, and the operation is performed using the temporary identifier.
- the resource for extension cell is discovery information used for a partner terminal discovery process in a D2D proximity service (D2D communication that is direct inter-terminal communication), and in the operation step, the user terminal When the expansion target cell is expanded and then located in the expansion target cell, the discovery process is started based on the discovery information without connecting to the expansion target cell.
- D2D proximity service D2D communication that is direct inter-terminal communication
- the user terminal associates the off target cell resource allocated from the off target base station before the off target cell is turned off with the extension target cell resource. And the step of operating using the resource for off-target cell when the user terminal is located again in the off-target cell after the expansion of the extension target cell is completed.
- the extension target cell resource is a resource common to the off target cell resource allocated to the user terminal from the off target base station before the off target cell is turned off.
- the off-target base station and the extension target base station have the off-target cell resource allocated to the user terminal from the off-target base station, and the extension target cell resource.
- the method further includes the step of dividing the range in which the off target cell resource can be allocated and the range in which the extension target cell resource can be allocated in advance before the securing step.
- the communication control method includes a range in which at least one of the off target base station and the extension target base station can allocate the off target cell resource, and a range in which the extension target cell resource can be allocated. Receiving from the network information indicating at least one of the following.
- the user terminal is a fixed user terminal whose movement is restricted.
- the off-target base station is controlled by a mobility management entity that controls the off-target base station, or a base station that belongs to the same tracking area as the off-target base station Is further selected as the expansion target base station.
- the base station includes a mobile communication including an off-target base station that intends to turn off an off-target cell that is its own cell, and an extension target base station that is to perform cell expansion to complement the off-target cell. It is used in the system and corresponds to the off-target base station.
- the base station uses the off target base station to operate the off target cell, and the list information held by the off target base station is stored in the extended target base before the cell expansion is performed.
- a transmission unit for transmitting to the station is provided. The list information is used when the extension target cell whose coverage is extended by the extension target base station is operated.
- the base station includes a mobile communication including an off-target base station that intends to turn off an off-target cell that is its own cell, and an extension target base station that is to perform cell expansion to complement the off-target cell. It is used in the system and corresponds to the extension target base station.
- the base station is used when operating the off-target cell, and receives the list information held by the off-target base station from the off-target base station before the cell expansion is performed. And a control unit that operates an expansion target cell whose coverage is expanded based on the list information.
- FIG. 1 is a configuration diagram of an LTE system according to the present embodiment.
- the LTE system includes a plurality of UEs (User Equipment) 100, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) 10, an EPC (Evolved Packet Core) 20, and the like.
- 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 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, for example, a radio resource management (RRM) function, a user data routing function, and a measurement control function for mobility control and scheduling.
- 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 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.
- the memory 150 and the processor 160 constitute a control unit.
- the UE 100 may not have the GNSS receiver 130. Further, 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.
- the processor 160 executes various processes and various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 (including the MeNB 200 ⁇ / b> A, PeNB 200 ⁇ / b> B, and PeNB 200 ⁇ / b> B described later) 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 memory 230 may be integrated with the processor 240, and this set (that is, a chip set) may be used as the processor 240 '.
- 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.
- the processor 240 executes various processes and 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 (Medium 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 an uplink / downlink transport format (transport block size, modulation / coding scheme, and the like) and an allocated resource block.
- 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. Control signals (RRC messages) for various settings are transmitted 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. If there is an RRC connection between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connected state, otherwise, the UE 100 is in an 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 Multiple Access) for the downlink, and SC-FDMA (Single Carrier Division Multiple Access) for the uplink.
- OFDMA Orthogonal Frequency Division Multiple 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.
- a guard interval called a cyclic prefix (CP) is provided at the head of each symbol.
- the resource block includes a plurality of subcarriers in the frequency direction.
- a radio resource unit composed of one subcarrier and one symbol is called a resource element (RE).
- RE resource element
- frequency resources can be specified by resource blocks, and time resources can be specified by subframes (or slots).
- the section of the first few symbols of each subframe is a control region mainly used as a physical downlink control channel (PDCCH).
- the remaining section of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH).
- PDSCH physical downlink shared channel
- CRS cell-specific reference signals
- both ends in the frequency direction in each subframe are control regions mainly used as a physical uplink control channel (PUCCH). Further, the central portion in the frequency direction in each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH). Further, a demodulation reference signal (DMRS) and a sounding reference signal (SRS) are arranged in each subframe.
- DMRS demodulation reference signal
- SRS sounding reference signal
- D2D communication Next, normal communication (cellular communication) of the LTE system and D2D communication will be compared and described.
- FIG. 6 is a diagram showing a data path in cellular communication.
- a data path means a transfer path of user data (user plane).
- the data path of cellular communication goes through the network. Specifically, a data path passing through the eNB 200-1, the S-GW 300, and the eNB 200-2 is set.
- FIG. 7 is a diagram showing a data path in D2D communication. Here, a case where D2D communication is performed between the UE 100-1 that has established a connection with the eNB 200-1 and the UE 100-2 that has established a connection with the eNB 200-2 is illustrated.
- the data path of D2D communication does not go through the network. That is, direct radio communication is performed between UEs.
- direct radio communication is performed between UEs.
- the network traffic load and the battery consumption of the UE 100 are reduced by performing D2D communication between the UE 100-1 and the UE 100-2. The effect of doing etc. is acquired.
- D2D communication As a case where D2D communication is started, (a) a case where D2D communication is started after the partner terminal is discovered by performing an operation for discovering the partner terminal, and (b) a partner terminal is discovered. There is a case where D2D communication is started without performing the operation for.
- D2D communication is started when one of the UEs 100-1 and 100-2 discovers the other UE 100 in the vicinity.
- the UE 100 in order to discover the other terminal (neighboring terminal), the UE 100 has a function of discovering another UE 100 existing in its vicinity (Discover) and / or is discovered from another UE 100 (Discoverable). ) Has a function.
- the UE 100-1 transmits a discovery signal (Discovery signal / Discoverable signal) used to discover the partner terminal or to be discovered by the partner terminal.
- the UE 100-2 that has received the discovery signal discovers the UE 100-1.
- the UE 100-2 transmits a response to the discovery signal, so that the UE 100-1 that has transmitted the discovery signal discovers the UE 100-1 that is the counterpart terminal.
- the UE 100 does not necessarily need to perform D2D communication even if it discovers the counterpart terminal.
- the UE 100-1 and the UE 100-2 may negotiate each other and then perform D2D communication after discovering each other. It may be determined.
- Each of the UE 100-1 and the UE 100-2 starts D2D communication when agreeing to perform D2D communication.
- the UE 100-1 may report the discovery of a nearby UE 100 (ie, UE 100-2) to an upper layer (eg, application).
- the application can execute processing based on the report (for example, processing for plotting the location of the UE 100-2 on map information).
- the UE 100 can report to the eNB 200 that the partner terminal has been found, and can receive an instruction from the eNB 200 to perform communication with the partner terminal using cellular communication or D2D communication.
- the UE 100-1 starts transmitting a signal for D2D communication (such as broadcast notification) without specifying the partner terminal.
- a signal for D2D communication such as broadcast notification
- UE100 can start D2D communication irrespective of the presence or absence of a partner terminal's discovery.
- the UE 100-2 performing the signal standby operation for D2D communication performs synchronization or / and demodulation based on the signal from the UE 100-1.
- the UE 100 capable of performing D2D communication includes not only a general mobile UE 100 but also a fixed UE 100 with limited movement (hereinafter, referred to as a fixed UE as appropriate).
- a fixed UE As an example of the fixed UE 100 whose movement is restricted, the UE 100 whose position is fixed, or the UE 100 having the MTC function. Note that the fixed UE corresponds to a fixed node.
- the UE 100 that transmits (distributes) predetermined information (for example, advertisement) using the D2D proximity service (D2D communication) is appropriately referred to as a fixed D2DUE.
- the eNB 200 has a fixed UE list related to information on fixed UEs located (existing) in its own cell.
- the fixed UE list not only the identifier of the fixed UE but also the location information of the fixed UE may be registered. Further, the fixed UE list may be a list broadcast or unicast in the own cell.
- the eNB 200 may have a fixed D2D list related to information on a fixed UE having a D2D communication function.
- the eNB 200 may provide the fixed UE list with an item indicating whether or not the D2D communication function is present, so that one list may serve as both the fixed UE list and the fixed D2D list.
- the eNB 200 can use the following method to determine whether or not the UE 100 located in the own cell is a fixed UE.
- the capability information (capability information) received from the UE 100 located in the own cell includes information that can determine whether or not the eNB 200 is a fixed UE, the UE 100 that is the transmission source of the capability information It is determined that the UE is a fixed UE.
- the information that can determine whether or not it is a fixed UE is, for example, a fixed flag indicating whether or not it is a fixed UE.
- the fixed flag When the fixed flag is ON, the UE 100 that is the transmission source of capability information is a fixed UE.
- the fixed flag is OFF, the eNB 200 can determine that the UE 100 that is the transmission source of capability information is not a fixed UE.
- the eNB 200 determines that the capability information transmission source UE 100 is a fixed UE when the capability information includes a flag indicating the type of UE and the flag indicates that fixed advertisement delivery is performed.
- capability information contains the D2D flag which shows whether D2D communication is possible with a fixed flag
- eNB200 can determine whether UE100 of the transmission source of capability information is fixed D2DUE.
- the eNB 200 when the eNB 200 is an off target eNB that turns off its own cell in order to reduce power consumption, the eNB 200 continues to be in the own cell until the own cell is turned off, and the own cell is in an off state.
- finishes is determined to be a fixed UE.
- the eNB 200 acquires the handover destination C-RNTI assigned to the UE 100 that performs the handover from the handover destination eNB 200-1 when performing the handover procedure associated with turning off the own cell. For example, the eNB 200-1 notifies the handover request confirmation (HO Request Ack) including the reserved value of the Temporary C-RNTI. Thereafter, the eNB 200-1 notifies the handover source eNB 200 of the C-RNTI corresponding to the Temporary C-RNTI.
- HO Request Ack handover request confirmation
- the eNB 200-1 notifies the handover source eNB 200 of the C-RNTI corresponding to the Temporary C-RNTI.
- the eNB 200 acquires the handover source C-RNTI of the UE 100 that performs handover to the own cell from the eNB 200-1 of the handover source. For example, the eNB 200-1 notifies the handover request (HO Request) including the C-RNTI value.
- the eNB 200 Increase the number of handovers by one.
- the eNB 200 determines whether or not the UE 100 continues to be in the own cell until the own cell is turned off. When the number of times that the UE 100 has been handed over to the own cell exceeds the threshold when the UE 100 continues to be in the own cell and the own cell ends the off state, the eNB 200 is the fixed UE. Is determined.
- the eNB 200 holds the MME UE S1AP ID that is the identifier of the UE in the handover request message of the UE 100 to be handed over when performing the handover procedure associated with turning off the own cell. Thereafter, the eNB 200 confirms the MME UE S1AP ID of the UE 100 that performs handover to the own cell when the own cell's off state ends. The eNB 200 increases the number of handovers of the UE 100 associated with the same MME UE S1AP ID once before and after the own cell is turned off.
- the eNB 200 determines whether or not the UE 100 continues to be in the own cell until the own cell is turned off. When the number of times that the UE 100 has been handed over to the own cell exceeds the threshold when the UE 100 continues to be in the own cell and the own cell ends the off state, the eNB 200 is the fixed UE. Is determined.
- the eNB 200 when the eNB 200 is an extension target eNB that performs cell expansion for area supplementation while the neighboring eNB is turning off the cell, the eNB 200 continues to be present in the own cell while the own cell is expanding. And when the own cell is expanded, the UE 100 whose number of handovers exceeds the threshold is determined to be a fixed UE.
- the specific operation is the same as in the second method described above.
- ENB200 registers UE100 determined to be a fixed UE in the fixed UE list based on the above determination result.
- FIG. 8 is a sequence diagram for explaining an operation of deleting from the fixed UE list according to the present embodiment.
- FIG. 9 is a flowchart for explaining an operation of deleting from the fixed UE list according to the present embodiment. Note that a fixed D2DUE list may be used instead of the fixed UE list.
- the UE 100-1 and the UE 100-2 are located in the cell 250-1 of the eNB 200-1, and the UE 100- is associated with the off of the cell 250-1 of the eNB 200-1 and the expansion of the cell 250-2 of the eNB 200-2.
- the description will proceed assuming that UE 1 and UE 100-2 are located in cell 250-2.
- step S101 the eNB 200-1 determines that the UE 100-2 is a fixed UE by the determination described above, and registers the UE 100-2 in the fixed UE list.
- step S102 the eNB 200-1 determines that the UE 100-1 is a fixed UE, and registers the UE 100-1 in the fixed UE list.
- step S103 the eNB 200-1 turns on energy saving. That is, the eNB 200-1 turns off the cell 250-1.
- the eNB 200-2 extends the cell 250-2. Thereby, the UE 100-1 and the UE 100-2 are located in the cell 250-2.
- step S104 the eNB 200-2 determines that the UE 100-2 is a fixed UE, and registers the UE 100-2 in the fixed UE list.
- step S105 the eNB 200-2 determines that the UE 100-1 is a fixed UE, and registers the UE 100-1 in the fixed UE list.
- step S106 the eNB 200-1 turns off energy saving. That is, the eNB 200-1 turns on the cell 250-1.
- the eNB 200-2 ends the expansion of the cell 250-2.
- UE 100-1 and UE 100-2 are located in cell 250-1.
- step S107 the eNB 200-1 makes a resynchronization request to the UE 100-2 after turning off the energy saver.
- the UE 100-2 performs resynchronization.
- the eNB 200-1 confirms that the UE 100-2 is located in the cell 250-1.
- step S108 the eNB 200-1 similarly makes a resynchronization request to the UE 100-1, and confirms that the UE 100-1 is located in the cell 250-1.
- step S109 after elapse of a predetermined time from the resynchronization request in step S107, the eNB 200-1 makes a resynchronization request to the UE 100-2.
- the eNB 200-1 confirms that the UE 100-2 is located in the cell 250-1.
- step S110 after elapse of a predetermined time from the resynchronization request in step S108, the eNB 200-1 makes a resynchronization request to the UE 100-1.
- the eNB 200-1 determines that the UE 100-1 is not located in the cell 250-1 because resynchronization is not performed from the UE 100-1.
- step S111 the eNB 200-1 deletes the UE 100-1 from the fixed UE list.
- the eNB 200-1 notifies the eNB 200-2 that the UE 100-1 has moved from the cell 250-1.
- the eNB 200-2 deletes the UE 100-1 from the fixed UE list.
- step S151 the eNB 200-1 determines whether or not the UE 100 is a fixed UE registered in the fixed UE list.
- the eNB 200-1 ends the process when the UE 100 is not registered in the fixed UE list.
- the eNB 200-1 executes the process of step S152.
- step S152 the eNB 200-1 transmits a resynchronization request to the UE 100 registered in the fixed UE list.
- step S153 the eNB 200-1 determines whether or not resynchronization has been performed from the UE 100 registered in the fixed UE list. When resynchronization is performed from the UE 100, the eNB 200-1 ends the process for the UE 100 that has been resynchronized. On the other hand, the eNB 200-1 performs the process of step S154 when the resynchronization is not performed from the UE 100.
- step S154 the eNB 200-1 deletes the UE 100 from the fixed UE list, and ends the process for the UE 100.
- the eNB 200-1 executes these processes for all the UEs 100 registered in the fixed UE list.
- FIG. 10 is an explanatory diagram for explaining the operating environment of the mobile communication system according to the first embodiment.
- the mobile communication system includes UE 100 (UE 100-1, UE 100-2), UE 101 (UE 101-1 to UE 101-5), and eNB 200 (eNB 200-1, eNB 200-2).
- UE 100-1 is located in cell 250-1 managed by eNB 200-1
- UE 100-2 is located in cell 250-2 managed by eNB 200-2
- UE101 is fixed D2DUE and is performing D2D communication for advertisement delivery.
- UE 101-1 to UE 101-3 are installed in cell 250-1
- UE 101-4 and UE 101-5 are installed in cell 250-2.
- the eNB 200-1 is an off target eNB that turns off its own cell for energy saving.
- the eNB 200-2 is an extension target eNB that performs cell expansion to complement the cell 250-1.
- the eNB 200-1 selects an expansion target eNB that complements the cell 250-1.
- the eNB 200-1 selects the extension target eNB from the eNB 200 controlled by the MME that controls the eNB 200-1.
- the eNB 200-1 selects the extension target eNB from among the eNBs 200 (that is, the eNB 200 having the same tracking area list) belonging to the same tracking area as the eNB 200-1.
- the eNB 200-1 will be described assuming that the eNB 200-2 is selected as the extension target eNB.
- the eNB 200-1 in a state before the eNB 200-1 turns off the cell 250-1, the eNB 200-1 maintains a fixed UE list in which the UE 101-1 to the UE 101-3 are registered, and the eNB 200-1 -2 holds a fixed UE list in which UE 101-4 and UE 101-5 are registered.
- the eNB 200-1 uses the fixed UE list when operating the cell 250-1. Specifically, the eNB 200-1 broadcasts the fixed UE list in its own cell, or transmits the fixed UE list to the UE 100-1 by unicast. Using the received fixed UE list, the UE 100-1 can grasp, for example, fixed UEs that are in the cell 250-1.
- the eNB 200-2 uses the fixed UE list when operating the cell 250-2, similarly to the eNB 200-1.
- the eNB 200-1 transmits the fixed UE list to the eNB 200 via the X2 interface before the eNB 200-2 extends the cell 250-2.
- the eNB 200-1 turns off the cell 250-1, and the eNB 200-2 extends the cell 250-2.
- the eNB 200-2 operates the cell 250-2 with extended coverage based on the fixed UE list received from the eNB 200-1, in addition to the fixed UE list used when operating the cell 250-2. That is, the eNB 200-2 operates the cell 250-2 by taking over the fixed UE list from the eNB 200-1. Specifically, the eNB 200-2 broadcasts or unicasts the fixed UE list updated based on the fixed list received from the eNB 200-1 in the extended cell 250-2. This provides the UE 100-1 and the UE 100-2 in the cell 250-2 with a fixed UE list including information on the UE 101-3 from the UE 101-1 that is not in the fixed UE list held in advance by the eNB 200-2. Can do.
- FIG. 11 is a sequence diagram for explaining an operation at the start of energy saving according to the first embodiment.
- step S201 the eNB 200-1 transmits an ES request for requesting cell expansion to the eNB 200-2.
- the eNB 200-2 receives the ES request.
- step S202 the eNB 200-2 transmits a response to the ES request to the eNB 200-1.
- the eNB 200-1 receives the ES request response.
- the process of step S203 is executed.
- step S203 the eNB 200-1 transmits the fixed UE list to the eNB 200-2.
- the eNB 200-2 receives the fixed UE list.
- step S204 the eNB 200-2 transmits a fixed UE list response including the fact that the fixed UE list has been received to the eNB 200-1.
- the eNB 200-1 receives the fixed UE list response.
- the eNB 200-1 turns off the cell 250-1
- the eNB 200-2 expands the cell 250-2, and starts operation of the cell 250-2 based on the fixed list received from the eNB 200-1.
- FIG. 12 is a flowchart for explaining the operation at the end of the energy saving according to the first embodiment. Specifically, FIG. 12 is a flowchart for explaining the operation of the eNB 200-2 that extends the cell 250-2 in order to supplement the coverage of the cell 250-1.
- step S221 the eNB 200-2 uses the energy saving off (ES OFF) information indicating that the cell 250-1 has been turned off as the eNB 200-1 that has turned off the cell 250-1. Receive from.
- ES OFF energy saving off
- step S222 the eNB 200-2 determines whether or not it has a fixed UE list of the eNB 200-1.
- the eNB 200-2 executes the process of step S223.
- the process ends.
- step S223 the eNB 200-2 deletes the fixed UE list of the eNB 200-1. Since information unnecessary for the operation of the non-expanded cell 250-2 is deleted, the load on the eNB 200-2 can be reduced.
- the eNB 200-2 may return to the eNB 200-1 without deleting the fixed UE list. For example, the eNB 200-2 may return to the eNB 200-1 when the fixed UE list of the eNB 200-1 is updated.
- FIG. 13 is an explanatory diagram for explaining an operation according to the modified example of the present embodiment.
- it demonstrates centering on a different part from embodiment mentioned above, and abbreviate
- the list information transmitted from the off target eNB to the extension target eNB is a fixed UE list.
- the AP list is a white list of a wireless LAN access point (WLANAP or WiFiAP).
- FIG. 13A is a diagram of a state before energy saving is performed. As illustrated in FIG. 13A, each of the plurality of eNBs 200 (eNB 200-1 to eNB 200-3) has an AP list that is a white list of the AP 401 located in the own cell.
- the eNB 200-1 determines to turn off its own cell, and transmits the AP list held by the eNB 200-1 to each of the eNB 200-2 and the eNB 200-3. Thereafter, the eNB 200-1 turns off its own cell, and each of the eNB 200-2 and the eNB 200-3 expands its own cell (see FIG. 13B).
- each of the eNB 200-2 and the eNB 200-3 starts the operation of the expanded own cell.
- Each of the eNB 200-2 and the eNB 200-3 searches for APs in its own cell (periodically).
- the eNB 200-2 determines that the AP 401-1 exists in the own cell and the AP 401-2 and the AP 401-3 do not exist in the own cell.
- the eNB 200-2 updates the AP list by deleting the AP 401-2 and AP 401-3 from the AP list based on the determination result (see FIG. 13C).
- the eNB 200-3 updates the AP list by deleting the AP 401-1 from the AP list.
- Each of the eNB 200-2 and the eNB 200-3 operates the expanded cell based on the updated AP list. For example, each of the eNB 200-2 and the eNB 200-3 broadcasts or unicasts the updated AP list within the coverage of the own cell.
- Each of the eNB 200-2 and the eNB 200-3 may hold the updated AP list even after the cell expansion is completed.
- Each of the eNB 200-2 and the eNB 200-3 can use the held updated AP list when performing the next cell extension.
- each of the eNB 200-2 and the eNB 200-3 holds the AP list held before expanding its own cell, and holds it before expanding its own cell after the cell expansion is completed.
- AP list can be used.
- each of the eNB 200-2 and the eNB 200-3 can switch the AP list according to the expansion status of the own cell.
- the eNB 200-1 transmits a fixed UE list to the eNB 200-2 before cell extension is performed.
- the eNB 200-2 operates the cell 250-2 whose coverage is extended based on the fixed UE list.
- the eNB 200-2 can grasp the situation of the fixed UEs in the area complemented area based on the fixed UE list, and therefore, it is not necessary to perform an operation for grasping the fixed UEs, and it is possible to suppress a decrease in network efficiency.
- the fixed UE list is a list in which the eNB 200-1 is broadcast or unicast within the coverage of the cell 250-1.
- the eNB 200-2 can broadcast or unicast the fixed UE list within the coverage of the cell 250-2.
- the eNB 250-1 can broadcast or unicast the fixed UE list of the eNB 200-1 within the coverage of the cell 250-2 after performing the cell expansion, and thus it is possible to suppress a decrease in network efficiency.
- the eNB 200-2 deletes the fixed UE list or returns the fixed UE list to the eNB 200-1 after completing the cell extension.
- the eNB 200-2 can reduce the load on the eNB 200-2 because information unnecessary for the operation of the non-expanded cell 250-2 is deleted.
- the eNB 200-2 updates the fixed UE list. After completing the operation of the extended cell, the eNB 200-2 holds the fixed UE list updated for the next cell extension. As a result, the eNB 200-2 operates the extended cell using the updated fixed UE list, thereby further suppressing the decrease in network efficiency.
- the fixed UE list received by the eNB 200-2 from the eNB 200-1 is information indicating a list relating to a fixed node that exists in the cell 250-1 and whose position is fixed.
- the fixed node is a fixed UE 100 that transmits (distributes) information using a wireless LAN access point or a D2D proximity service (D2D communication). Since the fixed node whose position is fixed is likely to be located in the extended cell when the eNB 200-2 performs cell extension, the eNB 200-2 displays the list information regarding such a fixed node as the eNB 200 ⁇ . By acquiring from 1, it is possible to further suppress a decrease in network efficiency.
- the capability information including information that can determine whether or not the eNB 200-1 is a fixed UE is received from the UE 100 located in the cell 250-1.
- the eNB 200-1 determines whether the UE 100 is a fixed UE based on the capability information.
- the eNB 200-1 updates the fixed UE list based on the determination result.
- the number of times of handover to the cell 250-1 when the cell 250-1 continues to stay in the cell 250-1 until the cell 250-1 is turned off and the off state of the cell 250-1 is finished is as follows.
- the eNB 200-1 determines that the UE 100 exceeding the threshold is a fixed UE.
- the eNB 200-1 updates the fixed UE list based on the determination result.
- the cell 250-1 continues to be located, and when the cell 250-2 is expanded, the number of times of handover to the cell 250-2 is
- the eNB 200-2 determines that the UE 100 exceeding the threshold is a fixed UE.
- the eNB 200-2 updates the fixed UE list based on the determination result. Thereby, since a fixed UE list
- the eNB 200-1 selects the eNB 200 to be extended from the eNBs 200 that are controlled by the MME that controls the eNB 200-1.
- the eNB 200-1 selects the extension target eNB from the eNBs 200 that belong to the same tracking area as the eNB 200-1.
- eNB200-1 can suppress selecting the improper adjacent eNB200 which cannot perform area complementation as an expansion target eNB.
- the off target eNB transmits the list information to the extension target eNB.
- the off-target eNB transmits information on the fixed D2DUE to the extension target eNB, and before the cell extension is performed, the extension target eNB reserves in advance resources used in the extension cell after the cell extension for the fixed D2DUE The case to do is explained.
- FIG. 14 is a sequence (part 1) for explaining the operation of the eNB 200 according to the second embodiment.
- FIG. 15 is a sequence (part 2) for explaining the operation of the eNB 200 according to the second embodiment.
- eNB 200-1 is an off target eNB
- eNB 200-2 is an extension target eNB.
- the description proceeds with the assumption that UE 101-1 which is a fixed D2DUE is located in a cell managed by eNB 200-1.
- the UE 101-1 requests the eNB 200-1 to acquire Discovery information used for transmitting a discovery signal for D2D communication.
- the Discovery information acquisition request transmitted by the UE 101-1 includes information indicating whether or not the transmission source UE 101-1 is a fixed D2DUE.
- the Discovery information includes, for example, an identifier assigned for transmitting a discovery signal, a time / frequency resource used for transmitting the discovery signal, and the like.
- the eNB 200-1 determines whether the UE 101-1 is a fixed D2DUE based on the information indicating whether it is a fixed D2DUE. When the UE 101-1 is a fixed D2DUE, the eNB 200-1 executes the process of step S302. On the other hand, when the UE 101-1 is not a fixed D2DUE, the eNB 200-1 performs the process of step S311.
- the eNB 200-1 transmits a fixed D2DUE setting request to the eNB 200-2.
- the fixed D2DUE setting request includes information indicating a candidate group of resources that can be allocated by the eNB 200-1.
- the information indicating the resource candidate group includes a plurality of C-RNTIs and a plurality of Discovery information.
- the fixed D2DUE setting request is a request for securing resources used after cell expansion for the fixed D2DUE (UE 101-1), and UE 101- located in the own cell of eNB 200-1 1 for information.
- step S303 the eNB 200-2 searches for unused resources (that is, C-RNTI and Discovery information) in the own cell of the eNB 200-2 from the resource candidate group received from the eNB 200-1.
- unused resources that is, C-RNTI and Discovery information
- the eNB 200-2 executes the process of step S304. On the other hand, when there is no unused resource, the eNB 200-2 performs the process of step S308.
- step S304 the eNB 200-2 selects an unused resource (C-RNTI1, Discovery information 1). Further, the eNB 200-2 registers the selected resource in the fixed D2DUE list for the UE 101-1 that is the fixed D2DUE. Accordingly, the eNB 200-2 stores that the selected resource is used for the UE 101-1.
- step S305 the eNB 200-2 transmits a response to the fixed D2DUE setting request to the eNB 200-1.
- This response includes the resource (C-RNTI1, Discovery information 1) selected by the eNB 200-2.
- step S306 the eNB 200-1 registers the resources (C-RNTI1 and Discovery information 1) included in the response in the fixed D2DUE list for the UE 101-1.
- step S307 the eNB 200-1 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes a resource (C-RNTI1, Discovery information 1) and information indicating the eNB 200 that can use the resource (identifier of eNB 200-1, eNB 200-2).
- the UE 101-1 uses the common C-RNTI and Discovery information 1 without receiving resource allocation from the eNB 200-1 and the eNB 200-2 even when the cell switching based on energy saving is repeatedly performed.
- D2D communication can be performed.
- step S308 the eNB 200-2 transmits a response to the setting request for the fixed D2DUE to the eNB 200-1.
- This response includes information indicating that the response is not possible.
- step S309 the eNB 200-1 selects the Discovery information 2 from unused resources.
- step S310 the eNB 200-1 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes a resource (Discovery information 2).
- step S311 the eNB 200-1 selects the Discovery information 2 from unused resources.
- Step S312 corresponds to step S310.
- step S321 corresponds to step S301.
- the eNB 200-1 performs the process of step S322.
- the eNB 200-1 performs the process of step S328.
- step S322 the eNB 200-1 transmits a fixed D2DUE setting request to the eNB 200-2.
- step S323 the eNB 200-1 selects (C-RNTI1, Discovery information 1) from resources not used by the eNB 200-1. Further, the eNB 200-1 registers the selected resource in the fixed D2DUE list for the UE 101-1 that is the fixed D2DUE.
- step S324 the eNB 200-2 selects (C-RNTI2, Discovery information 2) from resources not used by the eNB 200-2. Further, the eNB 200-2 registers the selected resource in the fixed D2DUE list for the UE 101-1 that is the fixed D2DUE.
- step S325 the eNB 200-2 transmits a response to the fixed D2DUE setting request to the eNB 200-1.
- This response includes the resources (C-RNTI 2 and Discovery information 2) selected by the eNB 200-2.
- step S326 the eNB 200-1 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes (C-RNTI1, Discovery information 1, eNB 200-1) indicating the resource of eNB 200-1, and (C-RNTI 2, Discovery information 2, eNB 200-2) indicating the resource of eNB 200-2.
- UE 101-1 can perform D2D communication without receiving resource allocation from eNB 200-1 and eNB 200-2 by switching resources to be used in accordance with cell switching based on energy saving. .
- Steps S327 and S328 correspond to steps S311 and S312.
- FIG.16 and FIG.17 is explanatory drawing for demonstrating operation
- UE 101-1 to UE 101-3 which are fixed D2DUEs, are in a cell 250-1 managed by eNB 200-1.
- UE 101-4 and UE 101-5 which are fixed D2 DUEs, are in the cell 250-2 managed by the eNB 200-2.
- the eNB 200-2 includes not only the UE 101-4 and UE 101-5 existing in the coverage of the cell 250-2 before the cell expansion is performed, but also the coverage of the cell 250-2 after the cell expansion is performed.
- Resources C-RNTI, Discovery information
- UE 101-1 to UE 101-3 store the identifier of eNB 200-1 and the resource corresponding to eNB 200-1, and the identifier of eNB 200-2 and the resource corresponding to eNB 200-2. is doing.
- Each of UE 101-1 to UE 101-3 matches the on / off state of cell 250-1, specifically, the reception of a signal to turn off or turn on the cell from eNB 200-1 or eNB 200-2. Switch the resource to be used and transmit the discovery signal. Specifically, UE 101-1 to UE 101-3 transmit a discovery signal using a resource corresponding to the detected identifier of eNB 200.
- step S401 the UE 101-1 performs a procedure (random access procedure) for connecting to the eNB 200-1. Thereafter, the UE 101-1 connects to the eNB 200-1 (its cell). The eNB 200-1 assigns C-RNTI1 to the UE 101-1.
- step S402 the UE 101-1 transmits a D2D Discovery information acquisition request to the eNB 200-1.
- the D2D Discovery information acquisition request includes information indicating whether or not it is CRNTI1 and a fixed D2DUE.
- step S403 the eNB 200-1 selects the Discovery information 1 from unused resources.
- step S404 the eNB 200-1 registers C-RNTI1 and Discovery information 1 for the UE 101-1 in the fixed D2DUE list.
- step S405 the eNB 200-1 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes Discovery information 1.
- step S406 the UE 101-1 associates the identifier of the eNB 200-1, the C-RNTI1, and the Discovery information 1 and registers them in a predetermined list.
- step S407 the eNB 200-1 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes Discovery information 1.
- step S408 the UE 101-1 uses the Discovery information 1 to start transmitting Discovery 1 that is a discovery signal.
- step S411 the eNB 200-1 turns on energy saving. Thereby, the eNB 200-1 turns off its own cell, the eNB 200-2 expands its own cell, and performs area complementation of the cell of the eNB 200-1. Also, the UE 101-1 starts to be in the cell of the eNB 200-2.
- step S412 as in step S401, the UE 101-1 connects to the eNB 200-2 (its cell).
- the eNB 200-2 allocates C-RNTI2 to the UE 101-1.
- Step S413 as in Step S402, the UE 101-1 transmits a D2D Discovery information acquisition request to the eNB 200-2.
- the D2D Discovery information acquisition request includes information indicating whether it is C-RNTI2 or fixed D2DUE.
- step S414 the eNB 200-2 selects the Discovery information 2 from unused resources.
- step S415 the eNB 200-2 registers C-RNTI2 and Discovery information 2 for the UE 101-1 in the fixed D2DUE list.
- step S416 the eNB 200-2 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes Discovery information 2.
- step S417 the UE 101-1 associates the identifier of the eNB 200-2, C-RNTI2, and Discovery information 2 and registers them in a predetermined list.
- step S4108 the eNB 200-2 transmits a response to the D2D Discovery information acquisition request to the UE 101-1.
- This response includes Discovery information 2.
- step S419 the UE 101-1 uses the Discovery information 2 to start transmitting Discovery 2 that is a discovery signal.
- step S421 in FIG. 19 the eNB 200-1 turns off energy saving. As a result, the eNB 200-1 turns on its own cell, and the eNB 200-2 finishes extending its own cell. Also, UE 101-1 starts to be in the cell of eNB 200-1.
- step S422 the UE 101-1 operates using the CRNTI 1 without performing a procedure for connecting to the eNB 200-1 in accordance with the cell switching. Further, the eNB 200-1 uses the Discovery information 1 to start transmission of Discovery 1 that is a discovery signal.
- step S423 the UE 101-1 performs a procedure for connecting to the eNB 200-1, and connects to the eNB 200-1.
- the eNB 200-1 assigns C-RNTI3 to the UE 101-1.
- Steps S424 to S427 indicate that C-RNTI3 is used instead of C-RNTI1, Discovery information 3 is used instead of Discovery information 1, and Discovery3 is transmitted instead of Discovery1. Except for steps S402, S403, S405, and S408.
- Step S431 corresponds to step S411.
- step S432 UE 101-1 located in the cell of eNB 200-2 does not perform a procedure for connecting to eNB 200-1 in accordance with the cell switching.
- C-RNTI2 is used for the operation.
- the eNB 200-1 uses the Discovery information 2 to start transmission of Discovery 2 that is a discovery signal.
- step S433 the UE 101-1 performs a procedure for connecting to the eNB 200-2 and connects to the eNB 200-2.
- the eNB 200-1 assigns C-RNTI4 to the UE 101-1.
- Steps S434 to S437 indicate that C-RNTI4 is used instead of C-RNTI2, Discovery information 4 is used instead of Discovery information 2, and Discovery 4 is transmitted instead of Discovery 2. Except for steps S413, S414, S416, and S419.
- the eNB 200-1 transmits a fixed D2DUE setting request, which is information related to the UE 101-1 residing in the own cell, before cell expansion is performed.
- the eNB 200-2 reserves resources for the UE 101-1 to be used after cell extension based on the fixed D2DUE setting request.
- the UE 101-1 since the UE 101-1 has reserved resources in advance when cell extension is performed, the UE 101-1 has more resources than in the case where resources are reserved after cell extension. It can be used at an early stage, and when energy saving technology is introduced, it is possible to suppress a decrease in network efficiency.
- the UE 101-1 receives resources used in the cell of the eNB 200-2 before the cell of the eNB 200-1 is turned off.
- the UE 101-1 operates using the resource after the cell of the eNB 200-2 is expanded and while being in the cell of the eNB 200-2.
- the UE 101-1 can operate immediately using the resources after the cell of the eNB 200-2 is expanded.
- the resource is a C-RNTI that is a temporary identifier used to identify the UE 101-1 within the cell coverage of the eNB 200-2.
- the UE 101-1 can operate using the CRNTI by omitting the random access procedure for connecting to the cell of the eNB 200-2 when the cell of the eNB 200-2 is located after the cell of the eNB 200-2 is expanded. .
- the UE 100-1 does not need to omit the random access procedure each time energy saving is performed.
- the resource allocated to the eNB 200-2 is Discovery information used for the partner terminal discovery process (discovery signal transmission) in D2D communication.
- the UE 101-1 When the UE 101-1 is located in the eNB 200-2 cell after the eNB 200-2 cell is expanded, the UE 101-1 performs the discovery process based on the Discovery information without connecting to the eNB 200-2 (or the cell). Can do. As a result, the UE 100-1 does not have to connect to the eNB 200-2 each time energy saving is performed.
- the UE 101-1 associates and stores the resources allocated from the eNB 200-1 and the resources allocated from the eNB 200-2 before the cell of the eNB 200-1 is turned off.
- the UE 101-1 When the UE 101-1 is located again in the cell of the eNB 200-1 after the expansion of the cell of the eNB 200-2 is completed, the UE 101-1 operates using resources allocated from the eNB 200-1. As a result, the UE 101-1 can immediately operate using the resources after being in the cell of the eNB 200-1.
- the resource allocated from the eNB 200-2 is a resource common to the resource allocated from the eNB 200-1. Therefore, even if the cell is switched by the energy saving, the UE 101-1 can operate without switching the resource.
- the eNB 200-1 may transmit the fixed D2DUE list to the eNB 200-2 as list information instead of the fixed UE list.
- the eNB 200-1 may transmit not only the fixed UE list, the fixed UE list, and the AP list, but also other lists to the eNB 200-2.
- the eNB 200-1 holds at least one of the following lists described in “3GPP Technical Report“ TR 36.300 ”, at least one of the held lists is sent to the eNB 200-2. You may send it.
- Tracking Area List ⁇ List of CSG IDs (list of CSG IDs) List of donor eNBs (list of DeNB cells) ⁇ List of forbidden tracking area for roaming -Neighboring cell blacklist-Best of the best cells -List of donor eNB cells (DeNB cell list) -List of carrier frequencies ⁇ List of InterRAT (list of RATs) List of frequencies (list of frequencies) -Neighbor cell list -List of HRPD Secondary Pre-registration Zone IDs-List of Equivalent PLMNs-CSG whitelist (CSG whitelist) PCT list for hybrid cells (PCI list for hybrid cells) ⁇ MCCH session list ⁇ List of TMGI's (list of TMGI's) -E-RAB setup list (E-RAB Setup list) ⁇ List of tracking rears (where list of TA (s)) ⁇ List of GUMMEIs (list of GUMMEIs) ⁇ Emergency information distribution area list (Warning Area list) ⁇ Inter Fre
- resources are allocated to the fixed D2DUE, but the present invention is not limited to this. Resources may be assigned to fixed UEs, or resources may be assigned to general UEs 100.
- the eNB 200-1 selects a resource (for example, fixed D2DUE ID, C-RNTI1, Discovery) selected from unused resources in the eNB 200-1.
- a fixed D2 DUE setting request including information 1) may be transmitted to the eNB 200-2.
- the eNB 200-2 may transmit information indicating approval as a response to the fixed D2DUE setting request.
- the eNB 200-1 can transmit information (C-RNTI1, Discovery information 1, eNB 200-1, eNB 200-2) indicating that the resource is common to the eNB 200-1 and the eNB 200-2 to the UE 101.
- the eNB 200-2 in response to the setting request for the fixed D2DUE, together with information indicating acceptance, information indicating a resource selected from unused resources (C -Send RNTI2, Discovery information 2).
- C -Send RNTI2, Discovery information 2 information indicating that the eNB 200-1 is a resource different between the eNB 200-1 and the eNB 200-2 (C-RNTI1, Discovery information 1, eNB200-1 / C-RNTI2, Discovery information 2, eNB200-2)can be transmitted to the UE 101.
- the eNB 200-2 may also transmit information indicating the TA to the UE 101 via the eNB 200-1 for a fixed UE whose timing advance (TA) is known.
- TA timing advance
- the range in which the eNB 200-1 can be allocated, the range in which the eNB 200-2 can be allocated, and the range in which the eNB 200-2 can be allocated so that the resources allocated to the UE 101 by the eNB 200-1 and the eNB 200-2 do not overlap. May be divided in advance.
- the eNB 200-1 and the eNB 200-2 may share these allocatable ranges.
- At least one of the eNB 200-1 and the eNB 200-2 may receive information indicating at least one of these allocatable ranges from the upper network. Thereby, the eNB 200-1 and the eNB 200-2 can share these allocatable ranges.
- the fixed D2 DUE 101 transmits a discovery signal, but the present invention is not limited to this.
- the fixed D2DUE 101 can transmit a radio signal in the D2D proximity service.
- the fixed D2DUE 101 may transmit (and / or receive) a radio signal in D2D communication, and may transmit a D2D synchronization signal that is a signal transmitted in a D2D synchronization procedure for establishing synchronization between terminals.
- the eNB 200 eNB 200-1 and eNB 200-2) can perform the same operation as the operation in the second embodiment described above.
- the fixed D2DUE may transmit predetermined information (for example, advertisement) by a discovery signal, for example, or may transmit a D2D synchronization signal.
- the D2D synchronization signal includes D2DSS and a physical D2D synchronization channel (PD2DSCH).
- D2DSS is a signal that provides a time / frequency synchronization reference.
- PD2DSCH is a physical channel that carries more information than D2DSS. Note that the UE 100 located outside the cell coverage can synchronize with the D2D synchronization source (fixed D2DUE) based on the received D2D synchronization signal.
- the operations of the first and second embodiments described above may be implemented in combination as appropriate.
- the eNB 200-1 transmits the fixed D2DUE list to the eNB 200-2, and the eNB 200-2 is registered in the fixed D2DUE list and satisfies the predetermined condition (for example, D2DUE for advertisement distribution) Resources may be allocated.
- the predetermined condition for example, D2DUE for advertisement distribution
- the present invention is not limited to the LTE system, and the present invention may be applied to a system other than the LTE system.
- the mobile communication control method and the base station according to the present embodiment are useful in the mobile communication field because the reduction in network efficiency can be suppressed when the energy saving technology is introduced.
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Abstract
Description
実施形態に係る通信制御方法は、自セルであるオフ対象セルをオフしようとするオフ対象基地局と、前記オフ対象セルを補完するためのセル拡張を行うべき拡張対象基地局と、を有する移動通信システムにおいて用いられる。当該通信制御方法は、前記オフ対象基地局が、前記オフ対象セルを運用する際に用いられ前記オフ対象基地局が保持するリスト情報を、前記セル拡張が行われる前に前記拡張対象基地局に送信するステップと、前記拡張対象基地局が、前記リスト情報に基づいて、カバレッジが拡張された拡張対象セルを運用する運用ステップと、を備える。
(LTEシステム)
図1は、本実施形態に係るLTEシステムの構成図である。
次に、LTEシステムの通常の通信(セルラ通信)とD2D通信とを比較して説明する。
次に、固定UEリスト及び固定D2DUEリストについて説明する。
次に、固定UEリストからの削除について、図8及び図9を用いて説明する。図8は、本実施形態に係る固定UEリストから削除する動作を説明するためのシーケンス図である。図9は、本実施形態に係る固定UEリストから削除する動作を説明するためのフローチャートである。なお、固定UEリストでなく、固定D2DUEリストであってもよい。
(1)動作環境
次に、本実施形態に係る移動通信システムの動作環境について、図10を用いて説明する。図10は、第1実施形態に係る移動通信システムの動作環境を説明するための説明図である。
次に、エナジーセービングの開始時における動作について、図10及び図11を用いて説明する。図11は、第1実施形態に係るエナジーセービングの開始時における動作を説明するためのシーケンス図である。
次に、エナジーセービングの終了時における動作について、図10及び図12を用いて説明する。図12は、第1実施形態に係るエナジーセービングの終了時における動作を説明するためのフローチャートである。具体的には、図12は、セル250-1のカバレッジを補完するためにセル250-2の拡張を行っているeNB200-2の動作を説明するためのフローチャートである。
次に、本実施形態に係る変更例について、図13を用いて説明する。図13は、本実施形態の変更例に係る動作を説明するための説明図である。なお、上述した実施形態と異なる部分を中心に説明し、同様の部分は、説明を適宜省略する。
本実施形態において、eNB200-1が、セル拡張が行われる前に固定UEリストをeNB200-2に送信する。eNB200-2が、固定UEリストに基づいて、カバレッジが拡張されたセル250-2を運用する。これにより、eNB200-2は、固定UEリストにより、エリア補完した範囲の固定UEの状況が把握できるため、固定UEを把握するための動作を行う必要がなく、ネットワーク効率の低下を抑制できる。
次に、第2実施形態について、説明する。上述した第1実施形態と異なる部分を中心に説明し、同様の部分は、説明を適宜省略する。
まず、eNB200の動作を中心に、図14及び図15を用いて説明する。図14は、第2実施形態に係るeNB200の動作を説明するためのシーケンス(その1)である。図15は、第2実施形態に係るeNB200の動作を説明するためのシーケンス(その2)である。
(2.1)固定D2DUE101の動作概要
次に、固定D2DUE101の動作概要を中心に、図16及び図17を用いて説明する。図16及び図17は、第2実施形態に係るUE101の動作を説明するための説明図である。
次に、固定D2DUE101の動作シーケンスを、図18及び図19を用いて説明する。図18及び図19は、第2実施形態に係るUE101の動作を説明するためのシーケンス図である。
本実施形態において、eNB200-1が、自セルに在圏するUE101-1に関する情報である固定D2DUEの設定要求をセル拡張が行われる前に送信する。eNB200-2は、固定D2DUEの設定要求に基づいて、セル拡張が行われた後に用いられるリソースをUE101-1のために確保する。これにより、UE101-1は、セル拡張が行われた場合に、予めリソースが確保されているため、UE101-1は、セル拡張が行われた後にリソースが確保される場合に比べて、リソースを早期に用いることができ、エナジーセービング技術を導入した場合において、ネットワーク効率が低下することを抑制できる。
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。
・CSG IDのリスト(list of CSG IDs)
・ドナーeNBのリスト(list of DeNB cells)
・ローミング禁止のトラッキングエリアのリスト(list of forbidden tracking areas for roaming)
・隣接セルのブラックリスト
・ベストセルのリスト(list of the best cells)
・ドナーeNBセルのリスト(DeNB cell list)
・キャリア周波数のリスト(list of carrier frequencies)
・InterRATのリスト(list of RATs)
・周波数のリスト(list of frequencies)
・隣接セルリスト(neighbour cell list)
・HRPD Secondary Pre-registration Zone IDのリスト
・Equivalent PLMNsのリスト ・CSGホワイトリスト(CSG whitelist)
・ハイブリッドセルのためのPCTリスト(PCI list for hybrid cells)
・MCCHセッションリスト(MCCH session list)
・TMGI’sのリスト(list of TMGI’s)
・E-RABセットアップリスト(E-RAB Setup list)
・トラッキングリアの全体リスト(whole list of TA(s))
・GUMMEIのリスト(list of GUMMEIs)
・緊急情報の配信エリアリスト(Warning Area list)
・Inter Frequency Searchリスト(Inter Frequency Search list)
・PCI値リスト(list of PCI values)
・閾値を超えた無線品質のセルのリスト(list of cells whose radio quality exceeds the threshold)
・ドーマントセルのリスト(list of dormant cells)
・E-UTRAキャリアのリスト(list of E-UTRA carriers)
Claims (22)
- 自セルであるオフ対象セルをオフしようとするオフ対象基地局と、前記オフ対象セルを補完するためのセル拡張を行うべき拡張対象基地局と、を有する移動通信システムにおいて用いられる通信制御方法であって、
前記オフ対象基地局が、前記オフ対象セルを運用する際に用いられ前記オフ対象基地局が保持するリスト情報を、前記セル拡張が行われる前に前記拡張対象基地局に送信するステップと、
前記拡張対象基地局が、前記リスト情報に基づいて、カバレッジが拡張された拡張対象セルを運用する運用ステップと、を備えることを特徴とする通信制御方法。 - 前記リスト情報は、前記オフ対象基地局により前記オフ対象セルのカバレッジ内にてブロードキャスト又はユニキャストされていたリストを示す情報であり、
前記運用ステップは、前記拡張対象基地局が、前記拡張対象セルのカバレッジ内にて前記リスト情報をブロードキャスト又はユニキャストするステップを含むことを特徴とする請求項1に記載の通信制御方法。 - 前記拡張対象基地局が、前記運用ステップを終了した後、前記リスト情報を削除する又は前記リスト情報を前記オフ対象基地局に戻すステップをさらに備えることを特徴とする請求項1に記載の通信制御方法。
- 前記運用ステップは、前記拡張対象基地局が、前記リスト情報を更新するステップを含み、
前記通信制御方法は、前記拡張対象基地局が、前記運用ステップが終了した後、次のセル拡張のために更新した前記リスト情報を保持するステップをさらに備えることを特徴とする請求項1に記載の通信制御方法。 - 前記リスト情報は、前記オフ対象セル内に存在し、位置が固定された固定ノードに関するリストを示す情報であることを特徴とする請求項1に記載の通信制御方法。
- 前記運用ステップは、
前記拡張対象基地局が、前記リスト情報に登録されている固定ノードが前記拡張対象セルのカバレッジ内に存在するか否かを確認するステップと、
前記拡張対象基地局が、前記リスト情報に登録され、且つ、前記拡張対象セルのカバレッジ内に存在しない固定ノードの情報を削除するステップと、を含むことを特徴とする請求項5に記載の通信制御方法。 - 前記固定ノードは、無線LANアクセスポイント、又は、D2D近傍サービスを用いて情報を送信する固定型のユーザ端末であることを特徴とする請求項5に記載の通信制御方法。
- 前記固定ノードは、移動が制限された固定型のユーザ端末であり、
前記通信制御方法は、
前記オフ対象基地局が、固定型のユーザ端末か否かを判定可能な情報を含む能力情報を、前記オフ対象セルに在圏するユーザ端末から受信するステップと、
前記オフ対象基地局が、前記ユーザ端末から受信した前記能力情報に基づいて、前記ユーザ端末が前記固定型のユーザ端末であるか否かを判定する判定ステップと、
前記オフ対象基地局が、前記判定ステップの判定結果に基づいて、前記固定型のユーザ端末に関するリストを更新するステップと、をさらに備えることを特徴とする請求項5に記載の通信制御方法。 - 前記オフ対象基地局が、前記オフ対象セルがオフされるまで前記オフ対象セルに在圏し続け、且つ、前記オフ対象セルのオフ状態が終了した際に前記オフ対象セルにハンドオーバした回数が閾値を超えたユーザ端末を、移動が制限された固定型のユーザ端末であると判定する判定ステップと、
前記オフ対象基地局が、前記判定ステップの判定結果に基づいて、前記固定型のユーザ端末に関するリストを更新するステップと、をさらに備えることを特徴とする請求項5に記載の通信制御方法。 - 前記拡張対象基地局が、前記拡張対象セルが拡張している間に前記拡張対象セルに在圏し続け、且つ、前記拡張対象セルを拡張した際に前記拡張対象セルにハンドオーバした回数が閾値を超えたユーザ端末を、移動が制限された固定型のユーザ端末であると判定する判定ステップをさらに備え、
前記運用ステップにおいて、前記拡張対象基地局が、前記判定ステップの判定結果に基づいて、前記固定型のユーザ端末に関するリストを更新することを特徴とする請求項5に記載の通信制御方法。 - 前記オフ対象基地局が、前記オフ対象セルに在圏するユーザ端末に関するユーザ情報を前記セル拡張が行われる前に送信するステップと、
前記拡張対象基地局が、前記ユーザ情報に基づいて、前記セル拡張が行われた後に用いられる拡張対象セル用リソースを前記ユーザ端末のために確保する確保ステップと、をさらに備えることを特徴とする請求項1に記載の通信制御方法。 - 前記ユーザ端末が、前記オフ対象セルがオフされる前に前記拡張対象セル用リソースを受信するステップと、
前記ユーザ端末が、前記拡張対象セルが拡張した後で、且つ、前記拡張対象セルに在圏している間、前記拡張対象セル用リソースを用いて動作する動作ステップと、をさらに備えることを特徴とする請求項11に記載の通信制御方法。 - 前記拡張対象セル用リソースは、前記拡張対象セルのカバレッジ内で前記ユーザ端末を識別するために用いられる一時識別子であり、
前記動作ステップにおいて、前記ユーザ端末は、前記拡張対象セルが拡張した後、前記拡張対象セルに在圏した場合、前記拡張対象セルに接続するためのランダムアクセス手続きを省略して、前記一時識別子を用いて動作することを特徴とする請求項12に記載の通信制御方法。 - 前記拡張対象セル用リソースは、D2D近傍サービスにおける相手端末の発見処理に用いられる発見情報であり、
前記動作ステップにおいて、前記ユーザ端末は、前記拡張対象セルが拡張した後、前記拡張対象セルに在圏した場合、前記拡張対象セルに接続せずに、前記発見情報に基づいて、前記発見処理を開始することを特徴とする請求項12に記載の通信制御方法。 - 前記ユーザ端末が、前記オフ対象セルがオフされる前に前記オフ対象基地局から割り当てられたオフ対象セル用リソースと、前記拡張対象セル用リソースとを対応付けて記憶するステップと、
前記ユーザ端末が、前記拡張対象セルの拡張が終了した後に前記オフ対象セルに再び在圏した場合、前記オフ対象セル用リソースを用いて動作するステップと、をさらに備えることを特徴とする請求項12に記載の通信制御方法。 - 前記拡張対象セル用リソースは、前記オフ対象セルがオフされる前に前記オフ対象基地局から前記ユーザ端末に割り当てられたオフ対象セル用リソースと共通のリソースであることを特徴とする請求項11に記載の通信制御方法。
- 前記オフ対象基地局と前記拡張対象基地局とが、前記オフ対象基地局から前記ユーザ端末に割り当てられるオフ対象セル用リソースと、前記拡張対象セル用リソースとが重複しないように、前記オフ対象セル用リソースを割り当て可能な範囲と前記拡張対象セル用リソースを割り当て可能な範囲とを、前記確保ステップの前に予め分けておくステップをさらに備えることを特徴とする請求項11に記載の通信制御方法。
- 前記オフ対象基地局と前記拡張対象基地局との少なくとも一方が、前記オフ対象セル用リソースを割り当て可能な範囲と前記拡張対象セル用リソースを割り当て可能な範囲との少なくとも一方を示す情報をネットワークから受信するステップをさらに備えることを特徴とする請求項17に記載の通信制御方法。
- 前記ユーザ端末は、移動が制限された固定型のユーザ端末であることを特徴とする請求項11に記載の通信制御方法。
- 前記オフ対象基地局が、前記オフ対象基地局を制御する移動管理エンティティに制御される基地局、又は、前記オフ対象基地局と同一のトラッキングエリアに属する基地局を、前記拡張対象基地局として選択するステップをさらに備えることを特徴とする請求項1に記載の通信制御方法。
- 自セルであるオフ対象セルをオフしようとするオフ対象基地局と、前記オフ対象セルを補完するためのセル拡張を行うべき拡張対象基地局と、を有する移動通信システムにおいて用いられ、前記オフ対象基地局に該当する基地局であって、
前記オフ対象基地局が、前記オフ対象セルを運用する際に用いられ、なお且つ前記オフ対象基地局が保持するリスト情報を、前記セル拡張が行われる前に前記拡張対象基地局に送信する送信部を備え、
前記リスト情報は、前記拡張対象基地局により、カバレッジが拡張された拡張対象セルを運用する際に用いられることを特徴とする基地局。 - 自セルであるオフ対象セルをオフしようとするオフ対象基地局と、前記オフ対象セルを補完するためのセル拡張を行うべき拡張対象基地局と、を有する移動通信システムにおいて用いられ、前記拡張対象基地局に該当する基地局であって、
前記オフ対象セルを運用する際に用いられ、なお且つ前記オフ対象基地局が保持するリスト情報を、前記セル拡張が行われる前に前記オフ対象基地局から受信する受信部と、
前記リスト情報に基づいて、カバレッジが拡張された拡張対象セルを運用する制御部と、を備えることを特徴とする基地局。
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- 2014-11-25 WO PCT/JP2014/081049 patent/WO2015080080A1/ja active Application Filing
- 2014-11-25 JP JP2015550924A patent/JP6433433B2/ja active Active
- 2014-11-25 US US15/039,245 patent/US20170105165A1/en not_active Abandoned
Patent Citations (2)
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WO2010104143A1 (ja) * | 2009-03-13 | 2010-09-16 | 日本電気株式会社 | 無線通信システムと方法と無線基地局と制御局 |
JP2011217218A (ja) * | 2010-04-01 | 2011-10-27 | Nec Corp | 無線通信装置、無線端末、無線通信システム、無線通信方法及びプログラム |
Non-Patent Citations (2)
Title |
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"TR 36.927 VII.0.0", 3GPP TECHNICAL REPORT, September 2012 (2012-09-01) |
See also references of EP3076700A4 |
Also Published As
Publication number | Publication date |
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US20170105165A1 (en) | 2017-04-13 |
JPWO2015080080A1 (ja) | 2017-03-16 |
JP6433433B2 (ja) | 2018-12-05 |
EP3076700A1 (en) | 2016-10-05 |
EP3076700A4 (en) | 2017-06-28 |
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