WO2015020035A1 - 基地局 - Google Patents
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- WO2015020035A1 WO2015020035A1 PCT/JP2014/070592 JP2014070592W WO2015020035A1 WO 2015020035 A1 WO2015020035 A1 WO 2015020035A1 JP 2014070592 W JP2014070592 W JP 2014070592W WO 2015020035 A1 WO2015020035 A1 WO 2015020035A1
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- radio resource
- cell
- control unit
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- 238000004891 communication Methods 0.000 claims abstract description 74
- 230000006870 function Effects 0.000 claims description 95
- 238000010295 mobile communication Methods 0.000 claims description 39
- 238000012545 processing Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 24
- 238000010586 diagram Methods 0.000 description 25
- 230000004044 response Effects 0.000 description 7
- 239000013307 optical fiber Substances 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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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 base station used in a mobile communication system.
- 3GPP 3rd Generation Partnership Project
- energy saving technology for reducing power consumption of base stations is introduced (for example, see Non-Patent Document 1).
- the power consumption of the base station can be reduced by stopping the operation of the cell managed by the base station at night when communication traffic is low.
- the power consumption of the base station can be reduced by stopping the operation of the cell managed by the base station, the communication quality of the user terminal establishing the connection with the cell may be reduced. Therefore, it is required to realize power saving of the base station while suppressing a decrease in communication quality of the entire network.
- an object of the present invention is to make it possible to realize the power saving of the base station while suppressing the deterioration of the communication quality of the entire network.
- a base station is a base station used in a mobile communication system.
- the base station uses the radio unit and the antenna unit of the other base station.
- a control unit that controls the base station to perform the above function in place of the other base station.
- FIG. 1 is a configuration diagram of an LTE system.
- FIG. 2 is a block diagram of the eNB.
- FIG. 3 is a protocol stack diagram of a radio interface in the LTE system.
- FIG. 4 is a configuration diagram of a radio frame used in the LTE system.
- FIG. 5 is an explanatory diagram for explaining an operation outline in normal operation of the mobile communication system according to the present embodiment.
- FIG. 6 is an explanatory diagram for explaining an operation outline in an efficient operation of the mobile communication system according to the present embodiment.
- FIG. 7 is an explanatory diagram for explaining an example of operations of the eNB 200A and the eNB 200B in normal operation of the mobile communication system.
- FIG. 8 is an explanatory diagram for explaining an example (operation pattern 1) of operations of the eNB 200A and the eNB 200B in the efficient operation of the mobile communication system.
- FIG. 9 is an explanatory diagram for explaining an example (operation pattern 2) of the operation of the eNB 200A and the eNB 200B in the efficient operation of the mobile communication system.
- FIG. 10 is an explanatory diagram for explaining an operation sequence 1 when switching to an efficient operation of the mobile communication system.
- FIG. 11 is an explanatory diagram for explaining an operation sequence 2 when switching to an efficient operation of the mobile communication system.
- FIG. 12 is an explanatory diagram for explaining an example of changing the operation sequence when switching to efficient operation of the mobile communication system.
- FIG. 13 is an explanatory diagram for explaining an example of switching between normal operation of the mobile communication system and efficient operation of the mobile communication system.
- a base station (eNB 200A) is a base station used in a mobile communication system.
- the base station uses the radio unit and the antenna unit of the other base station.
- a control unit that controls the base station to perform the above function in place of the other base station.
- the other base station further includes a baseband unit that performs processing of a baseband signal, and a control unit that performs control in the other base station.
- the partial functions are a function of the baseband unit and a function of the control unit of the other base station.
- the other base station further includes a control unit that performs control in the other base station.
- the partial function is a function of the control unit of the other base station, and is an RRC function for controlling communication with the user terminal connected to the other base station.
- the other base station manages the first radio resource and the second radio resource.
- the other base station performs a first switching for the user terminal that performs communication using the first radio resource to perform communication using the second radio resource.
- the other base station stops management of the first radio resource after performing the first switching.
- the control unit controls the first radio resource to be managed by the base station on behalf of the other base station while using the radio unit and the antenna unit of the other base station. .
- control unit uses the first radio resource managed by the base station on behalf of the other base station by the user terminal that performs communication using the second radio resource. Then, the second switching for performing communication is controlled. The other base station stops management of the second radio resource after performing the second switching.
- the first radio resource is used for the operation of the first cell.
- the second radio resource is used for the operation of the second cell.
- the first switching is a handover procedure from the first cell to the second cell.
- the first radio resource and the second radio resource can be used by the base station and the other base stations that are divided in the time direction and / or the frequency direction so that they do not overlap each other.
- This is a radio resource in a predetermined frequency band.
- the base station (eNB 200B) is a base station that is used in a mobile communication system and includes a radio unit and an antenna unit.
- the base station further includes a control unit that controls an efficient operation in which the base station stops some functions related to communication with the user terminal.
- the control unit performs the efficient operation when another base station located around the base station performs the partial function on behalf of the base station while using the radio unit and the antenna unit. Control the behavior.
- the base station further includes a baseband unit that performs baseband signal processing.
- the partial functions are a function of the baseband unit and a function of the control unit.
- control unit performs an RLC function for performing retransmission processing and a MAC function for performing scheduling and retransmission processing of radio resources.
- control unit manages the first radio resource and the second radio resource.
- the control unit controls first switching for the user terminal that performs communication using the first radio resource to perform communication using the second radio resource.
- the control unit stops managing the first radio resource after performing the first switching.
- the other base station after performing the first switching, manages the first radio resource while using the radio unit and the antenna unit of the base station. Instead, control is performed so as to be performed by the other base station.
- the control unit performs communication using the first radio resource managed by the other base station on behalf of the base station by the user terminal performing communication using the second radio resource. For controlling the second switching.
- the control unit stops managing the second radio resource after performing the second switching.
- the first radio resource is used for the operation of the first cell.
- the second radio resource is used for the operation of the second cell.
- the first switching is a handover procedure from the first cell to the second cell.
- the first radio resource and the second radio resource can be used by the base station and the other base stations that are divided in the time direction and / or the frequency direction so that they do not overlap each other.
- This is a radio resource in a predetermined frequency band.
- 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 eNB 200 is connected to each other via the X2 interface.
- the eNB 200 is connected to the MME / S-GW 300 via the S1 interface.
- the OAM 400 is a server device managed by an operator, and performs maintenance and monitoring of the E-UTRAN 10.
- FIG. 2 is a block diagram of the eNB 200.
- the eNB 200 includes an antenna unit 201, a radio unit 210, a baseband unit 220, a backhaul I / F 230, and a control unit 240.
- the control unit 240 includes a memory and a processor.
- the antenna unit 201 and the radio unit 210 are used for transmitting and receiving radio signals.
- the antenna unit 201 may be configured by a single antenna or may be configured by a plurality of antennas.
- the wireless unit 210 transmits and receives wireless signals through the antenna unit 201. Specifically, radio section 210 converts a radio signal received from antenna section 201 into a baseband signal and outputs the baseband signal to baseband section 220. Radio section 210 converts the baseband signal output from baseband section 220 into a radio signal and transmits it from antenna section 201. The radio unit 210 amplifies a signal to be transmitted / received.
- the radio unit 210 can perform the above-described processing on not only the signal from the baseband unit 220 but also the signal from the neighboring eNB 200 that is input via the backhaul I / F 230.
- the baseband unit 220 performs baseband signal processing. Specifically, the baseband unit 220 performs baseband signal processing such as modulation / demodulation and encoding / decoding of the baseband signal. Further, the baseband unit 220 can output the baseband signal to the backhaul I / F 230 in order to send the baseband signal to the radio unit 210 as well as to the neighboring eNB 200. Further, the baseband unit 220 can perform the above-described processing on the baseband signal from the neighboring eNB 200 input via the backhaul I / F 230 and output the baseband signal to the control unit 240 or the radio unit 210.
- baseband signal processing such as modulation / demodulation and encoding / decoding of the baseband signal.
- the baseband unit 220 can output the baseband signal to the backhaul I / F 230 in order to send the baseband signal to the radio unit 210 as well as to the neighboring eNB 200. Further, the baseband unit 220 can perform the above
- the baseband unit 220 includes a baseband processor. Note that the baseband processor may be integrated with a processor constituting the control unit.
- the backhaul I / F 230 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 backhaul I / F 230 is used for communication performed on the X2 interface and communication performed on the S1 interface. Further, the backhaul I / F 230 may be connected to the neighboring eNB 200 via an Xn interface and / or an Xy interface different from the X2 interface.
- the backhaul I / F 230 can transmit signals output from the radio unit 210, the baseband unit 220, and the control unit 240 to the neighboring eNB 200 using either the X2 interface or the Xn interface (or Xy interface). . Similarly, the backhaul I / F 230 can output a signal from the neighboring eNB 200 to any one of the radio unit 210, the baseband unit 220, and the control unit 240.
- the X2 interface may be configured by an optical fiber (Optical Fiber) that physically connects the eNB 200 and the adjacent eNB 200.
- the X2 interface may be configured by a signal line that is physically the same as the Xn interface and / or the Xy interface by using a fiber optic radio (ROF) modem.
- ROF fiber optic radio
- the X2 interface and the Xx interface or the Xy interface are switched depending on the situation of the mobile communication system. Specifically, the X2 interface is used in normal operation of the mobile communication system, and the Xx interface or Xy interface is used in efficient operation of the mobile communication system described later.
- the eNB 200 can transmit and receive signals to and from the neighboring eNB 200 by using the X2 interface and the Xx interface (or Xy interface) at the same time.
- the control unit 240 performs various controls described later.
- the control unit according to the present embodiment controls some functions of the neighboring eNB 200 instead of the neighboring eNB 200.
- the control unit is composed of a memory and a processor.
- the memory stores a program executed by the processor and information used for processing by the processor.
- the processor executes various processes and various communication protocols described later.
- FIG. 3 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. 4 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 ten 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
- FIG. 5 is an explanatory diagram for explaining an operation outline in normal operation of the mobile communication system according to the present embodiment.
- FIG. 6 is an explanatory diagram for explaining an operation outline in an efficient operation of the mobile communication system according to the present embodiment.
- the eNB 200A is installed adjacent to each eNB 200B, and is connected to each eNB 200B via the X2 interface.
- Each of the eNB 200A and each eNB 200B manages its own cell.
- the eNB 200B corresponds to the neighboring eNB 200 (neighboring eNB 200) of the eNB 200A.
- the eNB 200B when an efficient operation of the mobile communication system (for example, energy saving for the purpose of power saving) is performed, the eNB 200B performs an operation of stopping some functions related to communication with the UE 100.
- the eNB 200A performs some functions instead of the eNB 200B while using the radio unit 210 and the antenna unit 201 of the eNB 200B (see FIG. 6). Therefore, eNB200A can manage the cell of eNB200B instead of eNB200B.
- the eNB 200B can operate in the same manner as RRH (Remote Radio Head) when performing energy saving. That is, the eNB 200B behaves as a pseudo RRH.
- RRH Remote Radio Head
- FIG. 7 is an explanatory diagram for explaining an example of operations of the eNB 200A and the eNB 200B in normal operation of the mobile communication system.
- FIG. 8 is an explanatory diagram for explaining an example (operation pattern 1) of operations of the eNB 200A and the eNB 200B in the efficient operation of the mobile communication system.
- FIG. 9 is an explanatory diagram for explaining an example (operation pattern 2) of the operation of the eNB 200A and the eNB 200B in the efficient operation of the mobile communication system.
- the eNB 200A includes an antenna unit 201a, a radio unit 210a, a baseband unit 220a, a backhaul I / F 230a, and a control unit 240a.
- the eNB 200B includes an antenna unit 201b, a radio unit 210b, a baseband unit 220b, a backhaul I / F 230b, and a control unit 240b.
- the backhaul I / F 230a and the backhaul I / F 230b are connected via an X2 interface.
- the X2 interface is configured by an optical fiber.
- the control unit 240a In normal operation of the mobile communication system, in the eNB 200A, the control unit 240a outputs a signal to the baseband unit 220a for communication with the UE 100 located in the cell of the eNB 200A.
- the baseband unit 220a processes the input signal and outputs the signal to the radio unit 210a.
- the radio unit 210a processes the input signal and transmits the signal from the antenna unit 201a to the UE 100.
- the radio unit 210a processes the signal from the UE 100 received by the antenna unit 201a and outputs the signal to the baseband unit 220a.
- the baseband unit 220a processes the input signal and outputs the signal to the control unit 240a.
- eNB 200B signals are transmitted and received in the same manner as the eNB 200A.
- the eNB 200A and the eNB 200B can execute the following operation pattern.
- some of the functions stopped in the eNB 200B are the function of the baseband unit 220b and the function of the control unit 240b related to communication with the UE 100.
- eNB200A performs the function of the baseband part 220b and the said function of the control part 240b instead of eNB200B.
- the eNB 200A and the eNB 200B are connected via an Xx interface configured by an optical fiber.
- the control unit 240a transmits a signal for communication with the UE 100 located in the cell of the eNB 200B. It outputs to the baseband part 220a.
- the baseband unit 220 performs processing on the input signal and outputs it to the backhaul I / F 230a instead of the radio unit 210a.
- the backhaul I / F 230a transmits to the eNB 200B via the Xx interface.
- the backhaul I / F 230b receives a signal from the eNB 200A via the Xx interface, and outputs the signal to the radio unit 210b.
- the radio unit 210b processes the input signal and transmits the signal from the antenna unit 201b to the UE 100.
- radio section 210b processes the signal from UE 100 received by antenna section 201b and outputs the signal to backhaul I / F 230b.
- the backhaul I / F 230b transmits to the eNB 200A via the Xx interface.
- backhaul I / F230a receives the signal from eNB200B via an Xx interface, and outputs the said signal to the control part 240a.
- the control unit 240a performs a process for controlling the UE 100 according to the input signal.
- the eNB 200A controls communication with the UE 100 located in the cell of the eNB 200B.
- operation pattern 2 (see FIG. 9) will be described.
- some of the functions to be stopped in the eNB 200B are processing in the control plane, specifically, functions in the RRC layer related to communication with the UE 100 (RRC function) and functions in the PDCP layer related to communication with the UE 100 (PDCP). Function).
- the RRC function is a function for controlling communication with the UE 100 connected to the eNB 200B
- the PDCP function is a function for performing header compression / decompression and encryption / decryption.
- eNB200A performs an RRC function and a PDCP function instead of eNB200B.
- the control unit 240b of the eNB 200B executes the processing in the user plane, specifically, without stopping the function in the RLC layer (RLC function) and the function in the MAC layer (MAC function).
- the RLC function is a function that performs retransmission processing (ARQ: Automatic Repeat Request).
- the MAC function is a function for performing radio resource scheduling and retransmission processing (HARQ: Hybrid ARQ).
- the eNB 200A and the eNB 200B are connected via an Xy interface configured by a signal line other than an optical fiber.
- control unit 240b When the eNB 200B stops the RRC function and the PDCP function as a partial function, in the eNB 200B, when the control unit 240b receives a signal related to processing performed by the RRC function and the PDCP function from the UE 100, via the Xy interface, The signal is output to the eNB 200A.
- control part 240a performs the process which an RRC function and a PDCP function perform according to the said signal from eNB200B.
- the control part 240a transmits the signal processed by the RRC function and the PDCP function to eNB200B via an Xy interface.
- the control unit 240b transmits the signal from the eNB 200A from the antenna unit 201a to the UE 100 via the baseband unit 220b and the radio unit 210b.
- the control unit 240b when the control unit 240b receives a signal related to processing performed by the RLC function and the MAC function from the UE 100, the control unit 240b itself performs processing corresponding to the signal without transmitting the signal to the eNB 200A. Do.
- the eNB 200A may determine to perform the operation pattern 2 when the interface connecting the eNB 200A and the eNB 200B is a signal line other than an optical fiber.
- FIG. 10 is an explanatory diagram for explaining an operation sequence 1 when switching to efficient operation of the mobile communication system according to the present embodiment.
- FIG. 11 is an explanatory diagram for explaining an operation sequence 2 when switching to efficient operation of the mobile communication system according to the present embodiment.
- the eNB 200A manages the cell a1 corresponding to the carrier F1 and the cell a2 corresponding to the carrier F2.
- the eNB 200B manages the cell b1 corresponding to the carrier F1 and the cell b2 corresponding to the carrier F2. That is, the carrier F1 is used for the operation of the cell a1 and the cell b1, and the carrier F2 is used for the operation of the cell a2 and the cell b2.
- the eNB 200A determines whether or not to perform energy saving for the eNB 200B. Specifically, the eNB 200A (or the eNB 200B) can determine whether to perform energy saving of the eNB 200B according to any of the following first to third determination methods.
- the eNB 200A determines whether or not to perform energy saving of the eNB 200B based on a temporal change in traffic conditions (the number of connected UEs, the amount of transmitted / received data, or the radio resource usage rate) in the eNB 200A and / or the eNB 200B. Judging. For example, it is determined that the energy saving of the eNB 200B is performed in a time zone where the amount of transmitted / received data is small.
- the eNB 200A determines whether or not to perform energy saving of the eNB 200B based on an instruction (energy saving ON / OFF command) from OAM (Operation and Maintenance).
- the eNB 200A determines whether to perform energy saving based on the power supply status of the eNB 200A or the power supply status of the eNB 200B. If the eNB 200A is notified of the power supply status of the eNB 200B, the eNB 200A can grasp the power supply status of the eNB 200B. For example, when the power supply of the eNB 200B is interrupted (when the battery is driven), the eNB 200A has an output power of eNB 200B's private power generation (solar etc.) It is determined that the energy saving of the eNB 200B is performed when the value is lower than the specified value.
- the eNB 200A performs energy saving for the eNB 200B.
- eNB200A transmits the request
- the eNB 200B receives the request.
- the request includes information indicating that the eNB 200A manages the cell b1 corresponding to the carrier F1 instead of the eNB 200B.
- step S120 the eNB 200B determines to stop managing the cell b1 corresponding to the carrier F1 in response to reception of the request from the eNB 200A. Thereafter, the eNB 200B performs control for the UE 100 that performs communication using the carrier F1 corresponding to the cell b1 to perform handover (first switching) from the cell b1 to the cell b2. By this first switching, the UE 100 that performs communication using the carrier F1 starts communication using the carrier F2.
- the eNB 200B includes system information including information indicating that the management of the cell b1 is stopped and / or the cell b2 (only) is managed in order to move the idle UE 100 located in the cell b1 into the cell b2.
- a block (SIB) may be broadcast.
- step S130 the eNB 200B stops managing the cell b1.
- the eNB 200B transmits to the eNB 200A that the management of the cell b1 has been stopped.
- step S140 the eNB 200A starts managing the cell b1 corresponding to the carrier F1 on behalf of the eNB 200B while using the radio unit 210b and the antenna unit 201b of the eNB 200B.
- the eNB 200A transmits to the eNB 200B that the management of the cell b1 has been started.
- the eNB 200B receives information indicating that the management of the cell b1 has started.
- step S150 the eNB 200B performs control for the UE 100 that performs communication using the carrier F2 corresponding to the cell b2 to perform handover (second switching) from the cell b2 to the cell b1 in response to reception from the eNB 200A.
- the eNB 200B makes a handover request to the eNB 200A.
- the eNB 200B causes the UE 100 to perform handover from the cell b2 to the cell b1 in response to the handover request response from the eNB 200A.
- the UE 100 that performs communication using the carrier F2 starts communication using the carrier F1.
- the UE 100 that performs communication using the carrier F2 corresponding to the cell a2 performs control for performing handover from the cell a2 to the cell a1. Do. With this handover, the UE 100 that performs communication using the carrier F2 starts communication using the carrier F1.
- step S160 the eNB 200B stops the management of the cell b2.
- the eNB 200B transmits information indicating that the management of the cell b2 is stopped to the eNB 200A.
- the eNB 200A stops managing the cell a2. Thereby, eNB200A can manage only the cell a1 and the cell b1 corresponding to the carrier F1.
- the management of the cell b1 corresponding to the carrier F2 is stopped after the management of the cell b1 corresponding to the carrier F1, but in the operation sequence 2, the management of the cell b1 is stopped after the management of the cell b2 is stopped. Stop management.
- Step S210 corresponds to step S110.
- step S220 the eNB 200B determines to stop managing the cell b2 corresponding to the carrier F2 in response to reception of the request from the eNB 200A.
- the eNB 200B performs control for the UE 100 that performs communication using the carrier F2 corresponding to the cell b2 to perform handover (first switching) from the cell b2 to the cell b1.
- step S230 the eNB 200B stops managing the cell b2.
- the eNB 200B transmits to the eNB 200A that the management of the cell b2 has been stopped as a response to the energy saving request in step S210.
- step S240 as in step S140, the eNB 200A starts managing the cell b2 corresponding to the carrier F2 while using the radio unit 210b and the antenna unit 201b of the eNB 200B.
- the eNB 200A transmits to the eNB 200B that the management of the cell b2 has been started.
- step S250 the eNB 200B receives a message indicating that the management of the cell b2 from the eNB 200A is started, and the UE 100 that performs communication using the carrier F1 corresponding to the cell b1 performs a handover (first operation from the cell b1 to the cell b2). 2).
- step S260 the eNB 200B stops managing the cell b1.
- the eNB 200A may stop managing the cell a1 in the same manner as in the operation sequence 1.
- FIG. 12 is an explanatory diagram for explaining an example of changing the operation sequence when switching to efficient operation of the mobile communication system according to the present embodiment.
- the eNB 200B communicates with the UE 100 using the carrier F1 and the carrier F2.
- the eNB 200A switches to efficient operation of the mobile communication system when one carrier is used.
- the eNB 200A divides radio resources in a predetermined frequency band that can be used by the eNB 200A and the eNB 200B in the time direction or the frequency direction.
- the eNB 200A may divide radio resources in the time direction and the frequency direction.
- the eNB 200A determines a radio resource that can be used by the eNB 200A and a radio resource that can be used by the eNB 200B among the divided radio resources.
- the eNB 200A prevents radio resources that can be used by the eNB 200A and radio resources that can be used by the eNB 200B from overlapping each other.
- the eNB 200A notifies the eNB 200B of radio resources that can be used by the eNB 200B (or radio resources that can be used by the eNB 200A).
- the eNB 200B does not allocate radio resources that can be used by the eNB 200A to the UE 100 located in the own cell, and stops management of radio resources that can be used by the eNB 200A.
- the eNB 200A starts managing radio resources that can be used by the eNB 200A in place of the eNB 200B while using the radio unit 210b and the antenna unit 201b of the eNB 200B.
- ENB200B controls UE100 which communicates using the radio
- ENB200B stops management of the radio
- the eNB 200B may transmit information indicating that management of radio resources is stopped to the eNB 200A.
- the eNB 200A may manage radio resources that the eNB 200B can use instead of the eNB 200B while using the radio unit 210b and the antenna unit 201b of the eNB 200B.
- the control unit 240a of the eNB 200A uses some of the functions while using the radio unit 210b and the antenna unit 201b of the eNB 200B. To be performed by the eNB 200A instead of the eNB 200B. Also, the control unit 240b of the eNB 200B stops some functions when the eNB 200A performs some functions instead of the eNB 200B while using the radio unit 210b and the antenna unit 201b. Thereby, even if eNB200B stops a part of function for power saving, the function of eNB200B which eNB200A stopped can be supplemented. Therefore, it is possible to realize the power saving of the base station while suppressing the deterioration of the communication quality of the entire network.
- eNB200B it is a part of function which eNB200B stops, and a part of function which the control part 240a of eNB200A controls on behalf of eNB200B is related with the function of the baseband part 220b, and communication with UE100 This is a function of the control unit 240b.
- eNB200B can aim at a power-saving by the part of the electric power used for the process of these functions.
- the eNB 200B is a part of the function that stops, and the part of the function that the control unit 240a of the eNB 200A controls instead of the eNB 200B is an RRC function that controls communication with the UE 100. Thereby, it is possible to save power by the amount of power used for the processing of this function.
- the functions performed by the eNB 200A without stopping are an RLC function that performs retransmission processing and a MAC function that performs radio resource scheduling and retransmission processing.
- retransmission control and scheduling can be performed without being affected by the backhaul delay, so that deterioration in communication quality can be further suppressed.
- the eNB 200B manages the cell b1 corresponding to the carrier F1 and the cell b2 corresponding to the carrier F2.
- the eNB 200B performs a handover procedure from the cell b1 to the cell b2, which is switching for the UE 100 that performs communication using the carrier F1 to perform communication using the carrier F2.
- eNB200B stops management of the cell b1 corresponding to the carrier F1 after switching.
- the control unit 240a of the eNB 200A controls the eNB 200A to manage the cell b1 corresponding to the carrier F1 instead of the eNB 200B while using the radio unit 210b and the antenna unit 201b of the eNB 200B.
- the control unit 240b of the eNB 200B manages the cell b1 and the cell b2.
- the control unit 240b controls a handover procedure from the cell b1 to the cell b2, which is switching for the UE 100 that performs communication using the carrier F1 to perform communication using the carrier F2.
- the control unit 240b stops managing the cell b1 after switching. Thereby, even if eNB200B stops management of cell b1, UE100 connected to cell b1 does not become incommunicable, but seamless communication is realizable.
- the control unit 240a of the eNB 200A uses the carrier F1 corresponding to the cell b1 managed by the eNB 200A, instead of the eNB 200B, by the UE 100 that performs communication using the carrier F2 corresponding to the cell b2.
- a handover procedure from the cell b2 to the cell b1 that is switching for performing communication is controlled.
- the eNB 200B stops the management of the cell b2 after performing the switching.
- the eNB 200A performs management of the cell b1 at the eNB 200A instead of the eNB 200B while using the radio unit 210b and the antenna unit 201b after performing the handover procedure from the cell b1 to the cell b2. To control.
- the control unit of the eNB 200B switches from the cell b2 to the cell b1 in which the UE 100 performing communication using the carrier F2 performs communication using the carrier F1 corresponding to the cell b1 managed by the eNB 200A on behalf of the eNB 200B. Control the handover procedure to After performing the switching, the control unit 240b of the eNB 200B stops the management of the cell b2. Thereby, even if eNB200B stops management of cell b2, UE100 connected to cell b2 does not become incommunicable, but seamless communication is realizable.
- the radio resource managed by the eNB 200B is a radio resource in a predetermined frequency band that can be used by the eNB 200A and the eNB 200B.
- the radio resources are divided in the time direction and / or the frequency direction so as not to overlap each other.
- the operation of the eNB 200A and the eNB 200B adjacent to the eNB 200A has been described, but the present invention is not limited thereto.
- the operation of the MeNB 200 and the PeNB 200 that is installed in the large cell managed by the MeNB 200 and that manages a cell smaller than the large cell may be performed.
- the eNB 200A corresponds to the MeNB 200
- the eNB 200B corresponds to the PeNB 200.
- the normal operation of the mobile communication system and the efficient operation of the mobile communication system may be switched according to the time zone.
- a time zone in which many UEs 100 communicate for example, 4:00 to 22:00
- normal operation is performed
- a time zone in which few UEs 100 communicate for example, 0:00 ⁇ 4: 00, 22:00 to 24:00
- an efficient operation may be performed.
- the eNB 200A controls the eNB 200 installed adjacent thereto, but is not limited thereto.
- the eNB 200A may control the eNB 200 that can communicate via the X2 interface and the Xx interface (or Xy interface).
- 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 base station according to the present invention is useful in the mobile communication field because it can realize power saving of the base station while suppressing a decrease in communication quality of the entire network.
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Abstract
Description
本実施形態に係る基地局(eNB200A)は、移動通信システムにおいて用いられる基地局である。当該基地局は、他の基地局がユーザ端末との通信に関する一部の機能を停止する効率的動作を行う場合において、前記他の基地局の無線部及びアンテナ部を利用しながら、前記一部の機能を前記他の基地局に代わって前記基地局で行うように制御する制御部を備える。
(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。
(1)動作概要
次に、本実施形態に係る移動通信システムの動作概要を、図5及び図6を用いて説明する。図5は、本実施形態に係る移動通信システムの通常の運用における動作概要を説明するための説明図である。図6は、本実施形態に係る移動通信システムの効率的な運用における動作概要を説明するための説明図である。
次に、移動通信システムの効率的な運用が行われる場合の動作パターンについて、図7から図9を用いて説明する。図7は、移動通信システムの通常の運用におけるeNB200A及びeNB200Bの動作の一例を説明するための説明図である。図8は、移動通信システムの効率的な運用におけるeNB200A及びeNB200Bの動作の一例(動作パターン1)を説明するための説明図である。図9は、移動通信システムの効率的な運用におけるeNB200A及びeNB200Bの動作の一例(動作パターン2)を説明するための説明図である。
次に、移動通信システムの通常の運用から効率的な運用へ切り替える場合におけるeNB200A及びeNB200Bの動作シーケンスを図10及び図11を用いて説明する。
次に、動作シーケンスの変更例を、図12を用いて説明する。図12は、本実施形態に係る移動通信システムの効率的な運用に切り替える場合の動作シーケンスの変更例を説明するための説明図である。
本実施形態において、eNB200BがUE100との通信に関する一部の機能を停止する動作を行う場合において、eNB200Aの制御部240aは、eNB200Bの無線部210b及びアンテナ部201bを利用しながら、一部の機能をeNB200Bに代わってeNB200Aで行うように制御する。また、eNB200Bの制御部240bは、eNB200Aが無線部210b及びアンテナ部201bを利用しながら、一部の機能をeNB200Bに代わって行う場合に、一部の機能を停止する。これにより、省電力化を図るためにeNB200Bが一部の機能を停止した場合であっても、eNB200Aが停止したeNB200Bの機能を補うことができる。従って、ネットワーク全体の通信品質の低下を抑制しつつ、基地局の省電力化を実現できる。
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。
Claims (14)
- 移動通信システムにおいて用いられる基地局であって、
他の基地局がユーザ端末との通信に関する一部の機能を停止する効率的動作を行う場合において、前記他の基地局の無線部及びアンテナ部を利用しながら、前記一部の機能を前記他の基地局に代わって前記基地局で行うように制御する制御部を備えることを特徴とする基地局。 - 前記他の基地局は、ベースバンド信号の処理を行うベースバンド部と、前記他の基地局における制御を行う制御部と、をさらに備え、
前記一部の機能は、前記ベースバンド部の機能及び前記他の基地局の前記制御部の機能であることを特徴とする請求項1に記載の基地局。 - 前記他の基地局は、前記他の基地局における制御を行う制御部をさらに備え、
前記一部の機能は、前記他の基地局の前記制御部の機能であって、前記他の基地局と接続する前記ユーザ端末との通信を制御するRRC機能であることを特徴とする請求項1に記載の基地局。 - 前記他の基地局は、第1の無線リソース及び第2の無線リソースを管理しており、
前記他の基地局は、前記第1の無線リソースを使用して通信を行う前記ユーザ端末が前記第2の無線リソースを使用して通信を行うための第1の切り替えを行い、
前記他の基地局は、前記第1の切り替えを行った後に前記第1の無線リソースの管理を停止し、
前記制御部は、前記他の基地局の前記無線部及び前記アンテナ部を利用しながら、前記第1の無線リソースの管理を前記他の基地局に代わって、前記基地局で行うように制御することを特徴とする請求項1に記載の基地局。 - 前記制御部は、前記第2の無線リソースを使用して通信を行う前記ユーザ端末が、前記他の基地局に代わって前記基地局が管理する前記第1の無線リソースを使用して通信を行うための第2の切り替えを制御し、
前記他の基地局は、前記第2の切り替えを行った後に前記第2の無線リソースの管理を停止することを特徴とする請求項4に記載の基地局。 - 前記第1の無線リソースは、第1のセルの運用に用いられ、
前記第2の無線リソースは、第2のセルの運用に用いられ、
前記第1の切り替えは、前記第1のセルから前記第2のセルへのハンドオーバ手続であることを特徴とする請求項4に記載の基地局。 - 前記第1の無線リソース及び前記第2の無線リソースは、互いに重複しないように、時間方向及び/又は周波数方向に分割された、前記基地局及び前記他の基地局が利用可能な所定の周波数帯域における無線リソースであることを特徴とする請求項4に記載の基地局。
- 移動通信システムにおいて用いられ、無線部とアンテナ部とを備える基地局であって、
前記基地局がユーザ端末との通信に関する一部の機能を停止する効率的動作を制御する制御部をさらに備え、
前記制御部は、前記基地局の周辺に位置する他の基地局が、前記無線部及び前記アンテナ部を利用しながら、前記一部の機能を前記基地局に代わって行う場合に、前記効率的動作を制御することを特徴とする基地局。 - ベースバンド信号の処理を行うベースバンド部をさらに備え、
前記一部の機能は、前記ベースバンド部の機能及び前記制御部の機能であることを特徴とする請求項8に記載の基地局。 - 前記制御部は、再送処理を行うRLC機能及び無線リソースのスケジューリングと再送処理とを行うMAC機能を行うことを特徴とする請求項8に記載の基地局。
- 前記制御部は、第1の無線リソース及び第2の無線リソースを管理しており、
前記制御部は、前記第1の無線リソースを使用して通信を行う前記ユーザ端末が前記第2の無線リソースを使用して通信を行うための第1の切り替えを制御し、
前記制御部は、前記第1の切り替えを行った後に前記第1の無線リソースの管理を停止することを特徴とする請求項8に記載の基地局。 - 前記他の基地局は、前記第1の切り替えを行った後に、前記基地局の前記無線部及び前記アンテナ部を利用しながら、前記第1の無線リソースの管理を前記基地局に代わって、前記他の基地局で行うように制御し、
前記制御部は、前記第2の無線リソースを使用して通信を行う前記ユーザ端末が、前記基地局に代わって前記他の基地局が管理する前記第1の無線リソースを使用して通信を行うための第2の切り替えを制御し、
前記制御部は、前記第2の切り替えを行った後に前記第2の無線リソースの管理を停止することを特徴とする請求項11に記載の基地局。 - 前記第1の無線リソースは、第1のセルの運用に用いられ、
前記第2の無線リソースは、第2のセルの運用に用いられ、
前記第1の切り替えは、前記第1のセルから前記第2のセルへのハンドオーバ手続であることを特徴とする請求項8に記載の基地局。 - 前記第1の無線リソース及び前記第2の無線リソースは、互いに重複しないように、時間方向及び/又は周波数方向に分割された、前記基地局及び前記他の基地局が利用可能な所定の周波数帯域における無線リソースであることを特徴とする請求項8に記載の基地局。
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