WO2015060172A1 - 通信制御方法、ネットワーク装置、及び基地局 - Google Patents
通信制御方法、ネットワーク装置、及び基地局 Download PDFInfo
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- WO2015060172A1 WO2015060172A1 PCT/JP2014/077426 JP2014077426W WO2015060172A1 WO 2015060172 A1 WO2015060172 A1 WO 2015060172A1 JP 2014077426 W JP2014077426 W JP 2014077426W WO 2015060172 A1 WO2015060172 A1 WO 2015060172A1
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- 238000004891 communication Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims abstract description 68
- 239000013589 supplement Substances 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 19
- 238000005259 measurement Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 10
- 230000010261 cell growth Effects 0.000 description 9
- 230000006870 function Effects 0.000 description 5
- 238000010295 mobile communication Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
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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
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
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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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- 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
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/165—Performing reselection for specific purposes for reducing network power consumption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/247—Reselection being triggered by specific parameters by using coverage extension
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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
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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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, a network device, 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 set to an off state (Deactivate) at night when communication traffic is low.
- off target cell the coverage of the neighboring cell.
- an object of the present invention is to provide a communication control method, a network device, and a base station that allow a neighboring cell to appropriately compensate for the coverage of an off target cell.
- the communication control method is a method for the neighboring cell to supplement the coverage of the off-target cell by increasing the transmission power of the neighboring cell when the off-target cell is set to the off state.
- the communication control method includes a step A in which a network device acquires a neighboring cell received power that is a received power of a radio signal from the neighboring cell from a user terminal connected to the off target cell; And a step B of determining an increase in transmission power of the neighboring cell based on neighboring cell received power.
- the network device is a device for supplementing the coverage of the off-target cell by increasing the transmission power of the neighboring cell when the off-target cell is set to the off state.
- the network device acquires, via the off target cell, neighboring cell received power notified from a user terminal connected to the off target cell, and transmits the neighboring cell based on the acquired neighboring cell received power. Determine the amount of power increase.
- the base station according to the third feature is a base station capable of increasing transmission power.
- the increase in the transmission power is based on the neighboring cell received power of the user terminal connected to a cell other than the cell managed by the base station.
- the neighboring cell received power includes received power of a radio signal from a cell managed by the base station.
- the communication control method is a method for the neighboring cell to supplement the coverage of the off-target cell by increasing the transmission power of the neighboring cell when the off-target cell is set to the off state.
- the communication control method includes a step A in which a user terminal connected to the off-target cell notifies the off-target cell of neighboring cell received power that is reception power of a radio signal from the neighboring cell; A network device that obtains the neighboring cell received power via a step B of determining an increase in transmission power of the neighboring cell based on the obtained neighboring cell received power.
- each of the plurality of user terminals when a plurality of user terminals are connected to the off target cell, in the step A, each of the plurality of user terminals notifies the neighboring cell received power to the off target cell, and the step B
- the network device based on the neighboring cell received power acquired for each of the plurality of user terminals, includes the transmission power of the neighboring cell so that all of the plurality of user terminals are included in the coverage of the neighboring cell. Determine the amount of increase.
- the neighboring cell is managed by the first base station.
- the off target cell is managed by the second base station.
- the network device is a server capable of communicating with the first base station and the second base station.
- the network device notifies the first base station of power control information indicating an increase in transmission power of the determined neighboring cell, and the power control information is received.
- the first base station further includes a step of increasing the transmission power of the neighboring cell based on the received power control information.
- the communication control method includes a step of notifying the first base station of information indicating a power increase time, which is a time at which the neighboring cell should increase transmission power, and the off target cell. And a step of notifying the second base station of information indicating an off time, which is a time to be set in an off state, from the network device.
- the off-target cell and the neighboring cell belong to the same frequency.
- the power rise time and the off time are set to substantially equal times.
- the first base station increases the transmission power of the neighboring cell at the power increase time, and the second base station turns off the cell to be turned off at the off time. And the step of the user terminal connected to the off-target cell performing a handover from the off-target cell to the neighboring cell.
- the network device is a device for supplementing the coverage of the off-target cell by increasing the transmission power of the neighbor cell when the off-target cell is set to the off state.
- the network apparatus includes a control unit that acquires, via the off target cell, neighboring cell received power notified from a user terminal connected to the off target cell.
- the control unit determines an increase in transmission power of the neighboring cell based on the acquired neighboring cell received power.
- FIG. 1 is a configuration diagram of an LTE system according to the embodiment.
- the LTE system according to the embodiment includes a UE (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- UE User Equipment
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- EPC Evolved Packet Core
- the UE 100 corresponds to a user terminal.
- the UE 100 is a mobile communication device, and performs radio communication with a cell (serving cell).
- the configuration of the UE 100 will be described later.
- the E-UTRAN 10 corresponds to a radio access network.
- the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
- the eNB 200 manages one or a plurality of cells and performs radio communication with the UE 100 that has established a connection with the own cell.
- the eNB 200 has a radio resource management (RRM) function, a user data routing function, a measurement control function for mobility control / scheduling, and the like.
- RRM radio resource management
- 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 EPC 20 corresponds to a core network.
- the LTE system network is configured by the E-UTRAN 10 and the EPC 20.
- the EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
- the MME performs various mobility controls for the UE 100.
- the SGW performs user data transfer control.
- the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
- the EPC 20 includes a server 400.
- the server 400 is a maintenance monitoring server managed by an operator, for example. The configuration of the server 400 will be described later.
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes a plurality of antennas 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 corresponds to a storage unit.
- the processor 160 (and the memory 150) constitutes a control unit.
- 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 plurality of antennas 101 and the wireless transceiver 110 are used for transmitting and receiving wireless signals.
- the radio transceiver 110 converts the baseband signal (transmission signal) output from the processor 160 into a radio signal and transmits it from the plurality of antennas 101. Further, the radio transceiver 110 converts radio signals received by the plurality of antennas 101 into baseband signals (received signals) and outputs the baseband signals 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 UE location information (longitude, latitude, etc.) indicating the geographical location 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 includes a plurality of antennas 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 corresponds to a storage unit.
- the processor 240 (and the memory 230) constitutes a control unit.
- the plurality of antennas 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the radio transceiver 210 converts a baseband signal (transmission signal) output from the processor 240 into a radio signal and transmits the radio signal from the plurality of antennas 201.
- the radio transceiver 210 converts radio signals received by the plurality of antennas 201 into baseband signals (reception signals) and outputs the baseband signals 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 a program 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 block diagram of the server 400.
- the server 400 includes a network interface 410, a memory 420, and a processor 430.
- the memory 420 corresponds to a storage unit.
- the processor 430 (and the memory 420) constitutes a control unit.
- the network interface 410 is used for communication with the eNB 200.
- the memory 420 stores a program executed by the processor 430 and information used for processing by the processor 430.
- the processor 430 executes programs stored in the memory 420 and performs various processes.
- the processor 430 executes various processes described later.
- FIG. 5 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 5, the radio interface protocol is divided into the first to third layers of the OSI reference model, and the first layer is a physical (PHY) layer.
- the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- the third layer includes an RRC (Radio Resource Control) layer.
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Between the physical layer of UE100 and the physical layer of eNB200, user data and a control signal are transmitted via a physical channel.
- the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Between the MAC layer of the UE 100 and the MAC layer of the eNB 200, user data and control signals are transmitted via a transport channel.
- the MAC layer of the eNB 200 includes a scheduler that determines an uplink / downlink transport format (transport block size, modulation / coding scheme) and an allocation resource block to the UE 100.
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Between the RLC layer of the UE 100 and the RLC layer of the eNB 200, user data and control signals are transmitted via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane that handles control signals. 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.
- RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connection state (RRC connection state). Otherwise, the UE 100 is in an idle state (RRC idle state).
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 6 is a configuration diagram of a radio frame used in the LTE system.
- 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.
- 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.
- Each resource block includes a plurality of subcarriers in the frequency direction.
- a resource element is composed of one subcarrier and one symbol.
- frequency resources are configured by resource blocks, and time resources are configured by subframes (or slots).
- the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) for transmitting a control signal.
- the remaining part of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH) for transmitting user data.
- reference signals such as cell-specific reference signals are distributed and arranged.
- both ends in the frequency direction in each subframe are regions used mainly as a physical uplink control channel (PUCCH) for transmitting a control signal.
- the remaining part of each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH) for transmitting user data.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- a communication control method relates to an improved energy saving technique. For example, when one cell is set to an off state, the transmission power of neighboring cells is increased. Thereby, the coverage of the neighboring cell is extended so that the neighboring cell supplements the coverage of the cell set to the off state (off target cell).
- FIG. 7 is a diagram illustrating an operating environment according to the embodiment.
- FIG. 8 is a diagram for explaining an outline of processing of the server 400 according to the embodiment.
- FIG. 9 is a diagram for explaining the cell expansion operation according to the embodiment.
- FIG. 7 an operation environment is assumed in which cells # 1 to # 3 are arranged adjacent to each other, and different eNBs 200 (eNBs 200-1 to 200-3) manage the cells # 1 to # 3. .
- Cell # 1 to cell # 3 belong to the same frequency.
- the UE 100 is connected to the cell # 1.
- cell # 2 and cell # 3 are off target cells, and cell # 1 is a neighboring cell.
- description will be given mainly focusing on the cell # 2 among the off target cells (cell # 2 and cell # 3).
- the server 400 can communicate with the eNBs 200-1 to 200-3.
- the server 400 corresponds to a network device for the neighboring cell # 1 to supplement the coverage of the off target cell # 2 by increasing the transmission power of the neighboring cell # 1. To do.
- the communication control method includes step A in which the UE 100 connected to the off target cell # 2 notifies the off target cell # 2 of the neighboring cell received power that is the reception power of the radio signal from the neighboring cell # 1. .
- the neighboring cell received power is, for example, reference signal received power (RSRP).
- RSRP notification is referred to as a measurement report.
- the measurement report of the UE 100 may include not only the neighboring cell received power but also the received power of the serving cell (ie, cell # 2).
- the server 400 acquires neighboring cell received power (measurement report) via the off target cell # 2.
- the communication control method includes a step B in which the server 400 determines an increase in transmission power of the neighboring cell # 1 based on the acquired neighboring cell reception power.
- the server 400 determines an increase in transmission power of the neighboring cell # 1 based on the acquired neighboring cell reception power.
- the amount of increase in the transmission power of the neighboring cell # 1 is set to an appropriate value. Can be set. Therefore, the neighboring cell # 1 can appropriately supplement the coverage of the off target cell # 2.
- “transmission power of neighboring cell # 1” is mainly transmission power of a broadcast signal transmitted by neighboring cell # 1.
- the notification signal is a reference signal, a synchronization signal, system information, or the like.
- each of the plurality of UEs 100 notifies the off target cell # 2 of the neighboring cell received power.
- the server 400 increases the transmission power of the neighboring cell # 1 so as to include all of the plurality of UEs 100 in the coverage of the neighboring cell # 1 based on the neighboring cell received power acquired for each of the plurality of UEs 100. Determine the amount. Thereby, all the UEs 100 connected to the off target cell # 2 can be included in the coverage of the neighboring cell # 1.
- the server 400 determines an increase in the transmission power of the neighboring cell # 1 based on the RSRP of the neighboring cell # 1 in the measurement report from the UE 100 connected to the off target cell # 2. .
- the server 400 may determine whether or not the UE 100 can be included in the coverage of the neighboring cell # 1 due to the power increase of the neighboring cell # 1 based on the RSRP of the neighboring cell # 1.
- the communication control method includes a step in which the server 400 notifies the eNB 200-1 of power control information indicating the determined increase amount of the transmission power of the neighboring cell # 1, and the power control information
- the eNB 200-1 that has received the request further increases the transmission power of the neighboring cell # 1 based on the received power control information.
- the communication control method includes a step of notifying the eNB 200-1 from the server 400 of information indicating the power increase time, which is the time when the neighboring cell # 1 should increase the transmission power, and the off target cell # 2. And a step of notifying the eNB 200-2 of information indicating an off time that is a time to be set in the off state.
- the server 400 can designate the power rise time and the off time.
- the power rise time and the off time are set to substantially equal times.
- the neighboring cell # 1 and the off target cell # 2 belong to the same frequency, if the power rise time is earlier than the off time, the neighboring cell # 1 gives strong interference to the off target cell # 2. There is a fear.
- the power increase time is later than the off time, communication disconnection may occur in the UE 100 connected to the off target cell # 2. Therefore, it is desirable to set the power rise time and the off time to substantially the same time.
- the communication control method includes a step in which the eNB 200-1 increases the transmission power of the neighboring cell # 1 at the power increase time, and a step in which the eNB 200-2 sets the off target cell # 2 in the off state at the off time.
- the UE 100 connected to the off target cell # 2 further performs a handover from the off target cell # 2 to the neighboring cell # 1. Thereby, since UE100 connected to OFF object cell # 2 is switched so that it may connect with extended neighbor cell # 1, the communication disconnection in the said UE100 can be avoided.
- FIG. 10 is an operation sequence diagram according to the embodiment.
- step S1 the UE 100 establishes a connection with the eNB 200-2 (cell # 2) and performs communication.
- step S2 the eNB 200-2 transmits measurement instruction information for instructing transmission of a measurement report to the UE 100.
- step S3 the UE 100, based on the measurement instruction information, the reference signal (RS) received from each of the eNB 200-1 (cell # 1), the eNB 200-2 (cell # 2), and the eNB 200-3 (cell # 3). ) Received power measurement.
- RS reference signal
- step S4 the UE 100 transmits a measurement report including a measurement result to the eNB 200-2.
- step S5 the eNB 200-2 that has received the measurement report transmits (transfers) the received measurement report to the server 400.
- step S6 the server 400 that has received the measurement report determines an increase in the transmission power of the eNB 200-1 (cell # 1) based on the received measurement report. Details of this processing will be described later.
- the server 400 transmits an OFF (Switch Off) instruction to each of the eNB 200-2 and the eNB 200-3.
- the off instruction includes information indicating the off time.
- the information indicating the off time is not limited to information directly indicating the off time, but may be information indirectly indicating the off time.
- the information that indirectly indicates the off time is, for example, a timer value that indicates an elapsed time from when the off instruction is received to when the off time is executed. With such a timer value, the off time can be specified even when the eNB 200 is not synchronized in time.
- the server 400 transmits a power up instruction to the eNB 200-1.
- the power increase instruction includes information indicating an increase amount of transmission power and information indicating a power increase time.
- the transmission power of the eNB 200-1 may be directly specified.
- the information indicating the power rise time is not limited to information directly indicating the power rise time, but may be information indirectly indicating the power rise time.
- the information indirectly indicating the power increase time is, for example, a timer value indicating an elapsed time from the reception of the power increase instruction to the execution of the power increase. With such a timer value, even when the eNB 200 is not synchronized in time, the power rise time can be designated.
- step S9 the eNB 200-1 that has received the power increase instruction increases the transmission power of the cell # 1 based on the power increase instruction. Specifically, the eNB 200-1 increases the transmission power of the cell # 1 by the increase amount specified according to the power increase instruction at the power increase time specified by the power increase instruction.
- step S10 the eNB 200-2 and the eNB 200-3 that have received the off instruction set the cell # 2 and the cell # 3 to the off state based on the off instruction. Specifically, the eNB 200-2 and the eNB 200-3 set the cell # 2 and the cell # 3 to the off state at the off time specified by the off instruction.
- step S11 the UE 100 performs a handover from the eNB 200-2 (cell # 2) to the eNB 200-1 (cell # 1).
- the handover may be performed by transmitting a handover instruction from the eNB 200-1 to the UE 100.
- step S12 the UE 100 establishes a connection with the eNB 200-1 (cell # 1) and continues communication.
- step S6 are diagrams for explaining the processing contents in the server 400.
- the server 400 acquires each measurement report of a plurality of UEs 100 (UE-1, UE-2,%) Connected to either the eNB 200-2 or the eNB 200-3.
- the server 400 determines that all UEs 100 can be included in the coverage by cell extension. To do.
- the server 400 turns off (Switch Off) and increases power when the received power for the eNB 200-1 that performs cell expansion is within a predetermined range (for example, a range of ⁇ 80 [dBm] to ⁇ 100 [dBm]). (Power Up) may be determined to be performed.
- the server 400 identifies the UE 100 (here, UE-1) with the lowest received power for the eNB 200-1 that performs cell expansion. If the transmission power is increased so that the reception power of UE-1 satisfies the required power, all UEs 100 can be included in the coverage by cell expansion.
- the server 400 holds in advance a table in which the minimum received power of the eNB 200-1 that performs cell expansion and the amount of increase in transmission power of the eNB 200-1 that performs cell expansion are associated with each other.
- the amount of increase in transmission power in the table is set such that the minimum received power matches the required power (target value).
- the server 400 determines 50 [dBm] corresponding to ⁇ 150 [dBm] as the increase in transmission power of the eNB 200-1 based on the table shown in FIG.
- FIG. 13 is a diagram for explaining a message configuration.
- the power increase (Power Up) instruction transmitted from the server 400 to the eNB 200 includes information indicating an increase amount of transmission power and information indicating a power increase time.
- the power increase instruction may further include a packet ID.
- the eNB 200 that has received the power increase instruction may transmit a power increase response (Power UP Response) to the server 400.
- the power increase response includes information indicating whether or not power increase is possible. The information may include the reason why the power increase is not possible.
- the off (Switch Off) instruction transmitted from the server 400 to the eNB 200 includes information indicating the off time.
- the off instruction may further include a packet ID.
- the UE 100 connected to the off target cell # 2 notifies the off target cell # 2 of the neighboring cell received power that is the reception power of the radio signal from the neighboring cell # 1.
- step B in which the server 400 determines an increase in the transmission power of the neighboring cell # 1 based on the acquired neighboring cell received power.
- the amount of increase in the transmission power of the neighboring cell # 1 is set to an appropriate value. Can be set. Therefore, the neighboring cell # 1 can appropriately supplement the coverage of the off target cell # 2.
- FIG. 14 is a diagram for explaining a modified example of the embodiment.
- server 400 since the received power for eNB 200-1 (cell # 1) that performs cell expansion is less than the threshold, server 400 covers UE-5 by cell expansion. It is judged that it cannot be included. Further, since the received power for the eNB 200-4 of another frequency is equal to or higher than the threshold value, the server 400 determines that the UE-5 can be connected to the eNB 200-4 of another frequency. In this case, the server 400 enables the communication of the UE-5 to be continued by controlling the UE-5 to be handed over to the eNB 200-4.
- the transmission power increase amount may be determined in the eNB 200.
- the eNB 200 corresponds to the network device according to the present invention.
- a plurality of cells are managed by different eNBs 200, but a plurality of cells may be managed by the same eNB 200.
- the LTE system has been described as an example of a mobile communication system.
- 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.
- Step A A communication control method for the neighboring cell to supplement the coverage of the off target cell by increasing the transmission power of the neighboring cell when the off target cell is set to the off state, Step A in which the network device acquires a neighboring cell received power that is a received power of a radio signal from the neighboring cell from a user terminal connected to the off target cell;
- the network control method comprises: a step B for determining an increase in transmission power of the neighboring cell based on the neighboring cell received power.
- a base station capable of increasing transmission power The increase in the transmission power is based on the neighboring cell received power of the user terminal connected to a cell other than the cell managed by the base station,
- the neighbor cell received power includes a received power of a radio signal from a cell managed by the base station.
- the present invention is useful in the field of wireless communication.
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Abstract
Description
実施形態に係る通信制御方法は、オフ対象セルをオフ状態に設定する場合に、近隣セルの送信電力を上昇させることにより前記オフ対象セルのカバレッジを前記近隣セルが補うための方法である。前記通信制御方法は、前記オフ対象セルに接続するユーザ端末が、前記近隣セルからの無線信号の受信電力である近隣セル受信電力を前記オフ対象セルに通知するステップAと、前記オフ対象セルを介して前記近隣セル受信電力を取得するネットワーク装置が、前記取得した近隣セル受信電力に基づいて、前記近隣セルの送信電力の上昇量を決定するステップBと、を備える。
以下において、本発明をLTEシステムに適用する場合の実施形態を説明する。
図1は、実施形態に係るLTEシステムの構成図である。図1に示すように、実施形態に係るLTEシステムは、UE(User Equipment)100、E-UTRAN(Evolved-UMTS Terrestrial Radio Access Network)10、及びEPC(Evolved Packet Core)20を備える。
実施形態に係る通信制御方法は、改良されたエナジーセービング技術に関する。例えば、一のセルをオフ状態に設定する場合に、近隣セルの送信電力を上昇させる。これにより、オフ状態に設定されるセル(オフ対象セル)のカバレッジを近隣セルが補うように、近隣セルのカバレッジを拡張する。
図10は、実施形態に係る動作シーケンス図である。
上述したように、実施形態に係る通信制御方法は、オフ対象セル#2に接続するUE100が、近隣セル#1からの無線信号の受信電力である近隣セル受信電力をオフ対象セル#2に通知するステップAと、サーバ400が、取得した近隣セル受信電力に基づいて、近隣セル#1の送信電力の上昇量を決定するステップBと、を備える。このように、オフ対象セル#2に接続するUE100の受信状態を考慮して近隣セル#1の送信電力の上昇量を決定することにより、近隣セル#1の送信電力の上昇量を適切な値に設定できる。よって、オフ対象セル#2のカバレッジを近隣セル#1が適切に補うことができる。
上述した実施形態では、セル#1乃至セル#3が同じ周波数に属する動作環境を想定していたが、セル#1乃至セル#3が属する周波数とは異なる周波数に属するセルが存在してもよい。この場合、オフ対象セル#2のセル拡張によりカバレッジに含めることができないUE100が存在する場合に、別周波数のセルへハンドオーバさせることにより、当該UE100の通信を継続可能としてもよい。
上述した実施形態では、送信電力上昇量の決定をサーバ400において行う一例を説明したが、送信電力上昇量の決定をeNB200において行なってもよい。この場合、eNB200は、本発明に係るネットワーク装置に相当する。
オフ対象セルをオフ状態に設定する場合に、近隣セルの送信電力を上昇させることにより前記オフ対象セルのカバレッジを前記近隣セルが補うための通信制御方法であって、
ネットワーク装置が、前記オフ対象セルに接続するユーザ端末から、前記近隣セルからの無線信号の受信電力である近隣セル受信電力を取得するステップAと、
前記ネットワーク装置が、前記近隣セル受信電力に基づいて、前記近隣セルの送信電力の上昇量を決定するステップBと、を備えることを特徴とする通信制御方法。
オフ対象セルをオフ状態に設定する場合に、近隣セルの送信電力を上昇させることにより前記オフ対象セルのカバレッジを前記近隣セルが補うためのネットワーク装置であって、
前記オフ対象セルに接続するユーザ端末から通知される近隣セル受信電力を、前記オフ対象セルを介して取得し、
前記取得した近隣セル受信電力に基づいて、前記近隣セルの送信電力の上昇量を決定する
ことを特徴とするネットワーク装置。
送信電力の上昇が可能な基地局であって、
前記送信電力の上昇は、前記基地局が管理するセル以外のセルに接続しているユーザ端末の近隣セル受信電力に基づくものであり、
前記近隣セル受信電力は、前記基地局が管理するセルからの無線信号の受信電力を含む
ことを特徴とする基地局。
日本国特許出願第2013-221804号(2013年10月25日出願)の全内容が、参照により、本願明細書に組み込まれている。
Claims (9)
- オフ対象セルをオフ状態に設定する場合に、近隣セルの送信電力を上昇させることにより前記オフ対象セルのカバレッジを前記近隣セルが補うための通信制御方法であって、
ネットワーク装置が、前記オフ対象セルに接続するユーザ端末から、前記近隣セルからの無線信号の受信電力である近隣セル受信電力を取得するステップAと、
前記ネットワーク装置が、前記近隣セル受信電力に基づいて、前記近隣セルの送信電力の上昇量を決定するステップBと、を備えることを特徴とする通信制御方法。 - 前記オフ対象セルに複数のユーザ端末が接続する場合に、
前記ステップAにおいて、前記ネットワーク装置は、前記複数のユーザ端末のそれぞれから、前記近隣セル受信電力を取得し、
前記ステップBにおいて、前記ネットワーク装置は、前記複数のユーザ端末のそれぞれについて取得した前記近隣セル受信電力に基づいて、前記複数のユーザ端末の全てを前記近隣セルのカバレッジに含めるように、前記近隣セルの送信電力の上昇量を決定することを特徴とする請求項1に記載の通信制御方法。 - 前記近隣セルは、第1基地局により管理されており、
前記オフ対象セルは、第2基地局により管理されており、
前記ネットワーク装置は、前記第1基地局及び前記第2基地局と通信可能なサーバ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。 - 前記ネットワーク装置が、前記決定した近隣セルの送信電力の上昇量を示す電力制御情報を前記第1基地局に通知するステップと、
前記電力制御情報を受信した前記第1基地局が、前記受信した電力制御情報に基づいて前記近隣セルの送信電力を上昇させるステップと、をさらに備えることを特徴とする請求項3に記載の通信制御方法。 - 前記近隣セルが送信電力を上昇させるべき時刻である電力上昇時刻を示す情報を前記ネットワーク装置から前記第1基地局に通知するステップと、
前記オフ対象セルをオフ状態に設定すべき時刻であるオフ時刻を示す情報を前記ネットワーク装置から前記第2基地局に通知するステップと、をさらに備えることを特徴とする請求項3に記載の通信制御方法。 - 前記オフ対象セル及び前記近隣セルは、同一の周波数に属しており、
前記電力上昇時刻及び前記オフ時刻は、略等しい時刻に設定されることを特徴とする請求項5に記載の通信制御方法。 - 前記電力上昇時刻において前記第1基地局が前記近隣セルの送信電力を上昇させるステップと、
前記オフ時刻において前記第2基地局が前記オフ対象セルをオフ状態に設定するステップと、
前記オフ対象セルに接続する前記ユーザ端末が前記オフ対象セルから前記近隣セルへのハンドオーバを行うステップと、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。 - オフ対象セルをオフ状態に設定する場合に、近隣セルの送信電力を上昇させることにより前記オフ対象セルのカバレッジを前記近隣セルが補うためのネットワーク装置であって、
前記オフ対象セルに接続するユーザ端末から通知される近隣セル受信電力を、前記オフ対象セルを介して取得し、
前記取得した近隣セル受信電力に基づいて、前記近隣セルの送信電力の上昇量を決定する
ことを特徴とするネットワーク装置。 - 送信電力の上昇が可能な基地局であって、
前記送信電力の上昇は、前記基地局が管理するセル以外のセルに接続しているユーザ端末の近隣セル受信電力に基づくものであり、
前記近隣セル受信電力は、前記基地局が管理するセルからの無線信号の受信電力を含む
ことを特徴とする基地局。
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