WO2013132920A1 - 通信制御装置、通信制御方法及び基地局 - Google Patents
通信制御装置、通信制御方法及び基地局 Download PDFInfo
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- WO2013132920A1 WO2013132920A1 PCT/JP2013/051862 JP2013051862W WO2013132920A1 WO 2013132920 A1 WO2013132920 A1 WO 2013132920A1 JP 2013051862 W JP2013051862 W JP 2013051862W WO 2013132920 A1 WO2013132920 A1 WO 2013132920A1
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- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present disclosure relates to a communication control device, a communication control method, and a base station.
- LTE Long Term Evolution
- WiMAX Wireless Fidelity
- LTE-A Long Term Evolution-Advanced
- the small cell is a concept including a femtocell, a nanocell, a picocell, a microcell, and the like.
- the small cell is typically introduced by installing a smaller base station (also referred to as an access point) than a macro cell base station (for example, eNB (evolved Node B) in LTE).
- eNB evolved Node B
- Patent Document 1 As a technique for avoiding the risk of interference in a cellular radio communication system, for example, a technique proposed by Patent Document 1 below is known. According to the technique proposed in Patent Document 1 below, interference channel information is exchanged between base stations of adjacent macro cells, and transmission power is adjusted by these base stations according to the exchanged interference channel information.
- a determination unit that determines whether an access type of a small cell that at least partially overlaps a macro cell of a wireless communication system is a closed access type or an open access type, and the access type of the small cell is
- An identification unit that identifies a user terminal of the macro cell to be protected from interference caused by radio signals from the small cell when it is determined that the access type is a closed access type, and the user terminal that is identified by the identification unit
- An interference control unit is provided that transmits an interference control signal to the base station of the small cell so that interference with the small cell is suppressed.
- an access type of a small cell that at least partially overlaps a macro cell of a wireless communication system is a closed access type or an open access type
- the access type of the small cell Is determined to be a closed access type, identifying a user terminal of the macro cell to be protected from interference due to radio signals from the small cell, and interference to the identified user terminal
- a communication control method comprising: transmitting an interference control signal to the base station of the small cell so as to be suppressed.
- a closed access type small cell base station when the small cell overlaps at least partially with a macro cell of a wireless communication system, between the macro cell and the small cell. Notifying the control node that controls interference that the access type of the base station is a closed access type, and suppressing interference to user terminals of the macro cell that should be protected from interference caused by radio signals from the small cell.
- a base station including a control unit that controls communication in the small cell according to an interference control signal transmitted from the control node in response to the notification is provided.
- a closed access type small cell base station when the small cell overlaps at least partially with a macro cell of a wireless communication system, interference between the macro cell and the small cell is reduced. Notifying the control node to be controlled that the access type of the base station is a closed access type, and suppressing interference to user terminals of the macro cell to be protected from interference caused by radio signals from the small cell.
- a communication control method including controlling communication in the small cell according to an interference control signal transmitted from the control node in response to the notification.
- the technique according to the present disclosure provides a mechanism that is more suitable for interference control between a macro cell and a small cell.
- FIG. 1 shows a wireless communication system 1 as an example.
- the radio communication system 1 may be a system based on any cellular radio communication scheme such as LTE, W-CDMA, CDMA2000, WiMAX, or LTE-A.
- a base station 11 for example, an eNB in LTE
- the radius of the macro cell is generally several hundred meters to several tens of kilometers.
- the small cell can be introduced to complement the macro cell and increase the communication capacity.
- the small cell is a concept including a femto cell, a nano cell, a pico cell, a micro cell, and the like, and is introduced by installing various types of small and medium base stations.
- Table 1 illustrates several types of small cell base stations.
- IF type is a classification related to an interface with a macro cell base station.
- RRH and hot zone base stations having an X2 interface with a macro cell base station can be classified as type 2, and femtocell base stations and relay stations without an X2 interface can be classified as type 1.
- Access type is a classification related to acceptance of access from the UE. In principle, all user terminals can be connected to an open access type small cell. On the other hand, in principle, only limited user terminals can be connected to a closed access type small cell.
- the closed access type small cell base station can maintain, for example, a list of identification information (such as an address, a device ID, or a user ID) of a user terminal that accepts a connection, and control access from the user terminal based on the list.
- a list of identification information such as an address, a device ID, or a user ID
- the access type of the small cell operated by the RRH, the hot zone base station, and the relay station is open.
- the access type of the small cell operated by the femtocell base station is closed or open.
- the access type classification shown in Table 1 is merely an example.
- FIG. 1 shows small cell base stations 16a, 16b and 16c.
- the small cell base stations 16a, 16b, and 16c provide wireless communication services to terminals in the small cells 14a, 14b, and 14c that at least partially overlap the macro cell 10, respectively.
- terminals connected to macro cells hereinafter referred to as macro cell terminals
- macro cell terminals terminals connected to small cells
- small cell terminals terminals connected to small cells
- the macro cell terminal 12a may receive interference from a radio signal transmitted in the small cell 14a.
- the macro cell terminals 12b and 12c may receive interference from a radio signal transmitted in the small cell 14b.
- the macro cell terminals 12d, 12e, 12f, and 12g may receive interference from radio signals transmitted in the small cell 14c.
- One existing technique for avoiding these risks of interference is transmission power control. If the transmission power of the small cell is reduced, the level of interference caused by the radio signal transmitted in the small cell is reduced. However, a reduction in transmission power means a reduction in the communication capacity of the small cell.
- CM Cooperation Manager
- FIG. 2 is an explanatory diagram for describing some examples of the arrangement of cooperation managers.
- FIG. 2 shows an LTE based network architecture as an example.
- the base station (eNB) 11 of the macro cell 10 is connected to the core network 20.
- the core network 20 is implemented as an EPC (Evolved Packet Core) including, for example, P-GW, S-GW, and MME.
- the core network 20 is further connected to the external network 30.
- the external network 30 is an IP (Internet Protocol) network also called a PDN (Packet Data Network), and various application (AP) servers can be mounted on the external network 30.
- IP Internet Protocol
- PDN Packet Data Network
- AP application
- HSS Home Subscriber Server
- MME Mobility Management Entity
- P-GW PDN-Gateway
- S-GW Serving-Gateway
- ENB evolved Node B
- RRM Radio resource management
- the cooperation manager may be arranged as a new control node in the core network 20 (CM1). Further, the cooperation manager may be arranged as a new function on an existing control node (for example, MME) in the core network 20 (CM2). Moreover, a cooperation manager may be arrange
- the coordination manager communicates with the macrocell base station and the small cell base station on a signaling path including the X2 interface (or other logical / physical interface), the core network 20 or the external network 30 or the like.
- a cooperation manager protects a macrocell terminal from the interference resulting from the radio signal from a small cell, without reducing communication capacity as much as possible.
- FIG. 3 is a block diagram illustrating an example of the configuration of the cooperation manager 100.
- the cooperation manager 100 includes a communication unit 110, a storage unit 120, and a control unit 130.
- the communication unit 110 is a communication module for communication with other nodes by the cooperation manager 100.
- the communication unit 110 may include a wireless communication module including an antenna and an RF (Radio Frequency) circuit, or may include a wired communication module such as a LAN (Local Area Network) connection terminal.
- RF Radio Frequency
- the storage unit 120 stores a program and data for the operation of the cooperation manager 100 using a storage medium such as a hard disk or a semiconductor memory.
- the storage unit 120 stores small cell related information received from a small cell base station.
- the small cell related information may include, for example, identification information and a location of the small cell base station.
- the storage unit 120 can also store scheduling information received from the macrocell base station.
- Control Unit 130 corresponds to a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).
- the control unit 130 operates various functions of the cooperation manager 100 by executing a program stored in the storage unit 120 or another storage medium.
- the control unit 130 has three functional modules: a determination unit 132, an identification unit 134, and an interference control unit 136.
- (3-1) Determination Unit When a small cell is installed in a macro cell, initial setup of the small cell is performed. During the initial setup procedure (or at a later stage), the small cell base station registers the small cell related information with the coordination manager 100. When recognizing a new small cell base station, the determination unit 132 determines whether the access type of the small cell operated by the small cell base station is a closed access type or an open access type. The access type determination may be performed based on access type information that can be directly included in the small cell related information, or by performing an inquiry to the database using the identification information of the small cell base station as a key. It may be broken.
- the determination unit 132 determines that the access type of the small cell is an open access type, a macro cell terminal located in or near the small cell can be connected to the small cell. Therefore, if the interference level from the small cell exceeds the allowable level, the macro cell terminal avoids interference by switching the connection destination from the macro cell to the open access type small cell (ie, handing over). Desired communication can be continued.
- the determination unit 132 determines that the access type of the small cell is a closed access type, connection to the small cell from a macro cell terminal that is not registered in advance may be rejected. Then, the identification part 134 demonstrated below identifies the macrocell terminal which may receive the interference from such a closed access type small cell.
- the identification unit 134 identifies a macro cell terminal to be protected from interference caused by a radio signal from the small cell. To do. More specifically, in this embodiment, the identification unit 134 identifies a macro cell terminal to be protected based on a sensing result received from the small cell base station. Sensing here typically means measurement of the signal level of an uplink signal from a user terminal located in the vicinity of a small cell (for example, inside and near the small cell). The small cell base station may voluntarily perform sensing. Instead, the identification unit 134 may request sensing to the small cell base station.
- the sensing result provided from the small cell base station is, for example, whether an uplink signal exceeding a predetermined level is detected in units of a single resource block or a plurality of resource blocks (“1” if detected). For example, “0” may be indicated. Instead, the sensing result may indicate the signal level of the detected uplink signal in units of single or multiple resource blocks.
- the identification unit 134 acquires macro cell scheduling information from the macro cell base station (or other control node). The scheduling information indicates which macro cell terminal uses which resource block to transmit an uplink signal. And the identification part 134 identifies the macrocell terminal which should be protected by collating the sensing result acquired from the small cell base station with the scheduling information of a macrocell. For example, a macro cell terminal that has been granted (ie, scheduled) an uplink grant (UL Grant) for a resource block in which an uplink signal exceeding a predetermined level is detected can be identified as a protection target.
- UL Grant uplink grant
- the identification unit 134 outputs the identification information of the macro cell terminal to be protected identified in this way and the identification information of the corresponding small cell base station to the interference control unit 136.
- the interference control unit 136 controls interference caused by a radio signal from the corresponding small cell so that interference with the macro cell terminal identified by the identification unit 134 is suppressed. For example, the interference control unit 136 transmits the macro cell scheduling information to the small cell base station so that the radio resource different from the radio resource allocated to the macro cell terminal to be protected is used in the small cell.
- FIG. 4 is an explanatory diagram for explaining a downlink frame format in LTE as an example.
- one radio frame having a length of 10 msec is shown.
- One radio frame is composed of 10 subframes each having a length of 1 msec.
- One subframe includes two 0.5 ms slots.
- One 0.5 ms slot typically includes 7 OFDM symbols in the time direction (6 when extended cyclic prefix is used).
- One resource block is composed of one OFDM symbol and twelve subcarriers in the frequency direction.
- a resource at a predetermined position is used for control signaling.
- a primary synchronization channel, a secondary synchronization channel, and a broadcast channel are arranged in some resource blocks located in the center of the band.
- the primary synchronization channel and the secondary synchronization channel are used for cell search and synchronization.
- the broadcast channel is used to broadcast system information such as system bandwidth and MIMO antenna configuration.
- the remaining resource blocks may be utilized for downlink data transmission.
- FIG. 5 is an explanatory diagram for explaining an uplink frame format in LTE as an example.
- one radio frame is composed of 10 subframes each having a length of 1 msec.
- a resource at a predetermined position is used for control signaling.
- a reference sequence for demodulating an uplink signal is arranged in the center in the time direction of each 0.5 ms slot.
- the reference sequence for CQI measurement may be arranged at the beginning of the second subframe (# 1).
- the random access channel (PRACH) is used for random access from the user terminal.
- a physical uplink shared channel (PUSCH) may be utilized for uplink data transmission.
- Allocation of resources for downlink data transmission to the macro cell terminal and uplink data transmission from the macro cell terminal is determined by the macro cell base station. Then, the macro cell base station distributes scheduling information indicating resource allocation to the macro cell terminal. Furthermore, in this embodiment, the macro cell base station also provides the scheduling information to the cooperation manager 100. For example, the interference control unit 136 filters information on resource blocks related to macro cell terminals to be protected from scheduling information provided from the macro cell base station, and transmits the filtered scheduling information to the small cell base station. It's okay.
- FIG. 6A is an explanatory diagram illustrating a first example of scheduling information transmitted from the interference control unit 136 to the small cell base station.
- each cell on the time-frequency plane corresponds to a resource block (RB).
- a shaded cell is a resource block assigned to a macro cell terminal to be protected.
- a non-shaded cell is a resource block that can be used by a small cell.
- the scheduling information transmitted from the interference control unit 136 to the small cell base station may be information such as a bitmap that distinguishes resource blocks that are restricted from use by the small cells and resource blocks that can be used in this way. .
- the interference control unit 136 transmits, for example, scheduling information indicating resource blocks used in adjacent small cells to the small cell base station in addition to the resource blocks related to the macro cell terminals to be protected. Also good.
- FIG. 6B is an explanatory diagram illustrating a second example of scheduling information transmitted from the interference control unit 136 to the small cell base station.
- the filled cells are resource blocks used in a small cell located in the vicinity of the small cell base station that receives the scheduling information. By providing such scheduling information, scheduling by these small cells can be controlled so that interference between a plurality of adjacent small cells is also suppressed.
- the small cell base station that has received the scheduling information illustrated in FIG. 6A or FIG. 6B controls the communication in the small cell so that only the resource blocks made available in the scheduling information are used by the small cell terminal. To do. However, when there are a large number of macro cell terminals or when there are macro cell terminals that consume a large number of resource blocks, it is difficult to ensure sufficient communication opportunities in the small cells while appropriately suppressing interference with the macro cell terminals. In some cases. Therefore, the interference control unit 136 accepts handover of at least one macro cell terminal to a small cell depending on, for example, the number of macro cell terminals to be protected or the ratio of radio resources used by the macro cell terminal. You may request
- the handover acceptance request transmitted from the interference control unit 136 may include identification information of the macro cell terminal to be handed over.
- the closed access type small cell base station adds the identification information of the macro cell terminal to the list of user terminals that accept the connection, and waits for a handover from the terminal.
- the macro cell terminal may move after interference control by the cooperation manager 100 is started. Therefore, it is desirable for the small cell base station to continuously sense the surroundings. For example, if the macro cell terminal to be protected moves far away from the small cell, the restrictions imposed on scheduling are no longer needed and the resources available in the small cell increase. However, continuous sensing for all resource blocks to which an uplink signal may be transmitted is a heavy load on the small cell base station and the small cell terminal. Therefore, for example, the interference control unit 136 may notify the small cell base station of the position (at least one of timing and frequency) of the resource to which the uplink signal is transmitted by the macro cell terminal to be protected.
- the uplink signal here may include, for example, an acknowledgment signal (ACK) for the downlink signal.
- the sensing load in the small cell can be reduced by narrowing down the resource position where the uplink signal is transmitted according to the period.
- the uplink signal may include a signal carrying a CQI (Channel Quality Indicator) on the PUSCH.
- CQI Channel Quality Indicator
- the uplink signal may be an authentication signal (for example, a signal transmitted for the purpose of handshake or billing) when a macro cell terminal to be protected uses a broadcast service.
- the broadcast service is provided using, for example, an MBMS (Multimedia Broadcast Multicast Service) frame.
- MBMS Multimedia Broadcast Multicast Service
- a terminal that receives a signal on an MBMS frame does not return an ACK. Therefore, by sensing the above-described authentication signal instead of the ACK signal, the movement of the macro cell terminal can be captured with a small sensing load.
- FIG. 7 is a block diagram illustrating an example of a configuration of the small cell base station 200 according to an embodiment.
- the small cell base station 200 includes a wireless communication unit 210, a network communication unit 220, a storage unit 230, and a control unit 240.
- the wireless communication unit 210 is a wireless communication module for providing a wireless communication service to a small cell terminal.
- the wireless communication unit 210 includes an antenna and an RF circuit.
- the radio communication unit 210 transmits / receives radio signals to / from one or more small cell terminals according to scheduling by the communication control unit 246 described later.
- the network communication unit 220 is a communication module for communication between the small cell base station 200 and a control node such as the cooperation manager 100.
- the network communication unit 220 may include a wireless communication module that can be shared with the wireless communication unit 210, or may include a wired communication module such as a LAN connection terminal.
- the storage unit 230 stores a program and data for the operation of the small cell base station 200 using a storage medium such as a hard disk or a semiconductor memory. For example, when the access type of the small cell operated by the small cell base station 200 is a closed access type, the storage unit 230 stores in advance a list of identification information of user terminals that accept connections. The storage unit 230 can also store scheduling information of macro cells (and neighboring small cells) provided from the cooperation manager 100.
- the control unit 240 corresponds to a processor such as a CPU or DSP.
- the control unit 240 operates various functions of the small cell base station 200 by executing a program stored in the storage unit 230 or another storage medium.
- the control unit 240 has three functional modules: a setting unit 242, a measurement unit 244, and a communication control unit 246.
- the setting unit 242 sets up a radio communication service operated by the small cell base station 200. For example, when the small cell base station 200 is installed in the macro cell, the setting unit 242 searches the cooperation manager 100 and transmits small cell related information to the detected cooperation manager 100.
- the small cell related information may include, for example, access type information indicating the access type of the small cell.
- the communication control unit 246 described later suppresses interference given to the macro cell terminal according to control by the cooperation manager 100.
- the measurement unit 244 senses uplink signals from user terminals around the small cell.
- the measurement unit 244 may spontaneously perform sensing after the initial setup of the small cell by the setting unit 242 is completed. Instead, the measurement unit 244 may perform sensing in response to a request from the cooperation manager 100. In addition to (or instead of) its own sensing, the measurement unit 244 may request the small cell terminal connected to the small cell base station 200 to perform sensing. The sensing results are collected by the measurement unit 244 and transmitted to the cooperation manager 100.
- the measurement unit 244 continuously senses uplink signals from user terminals in the vicinity of the small cell even after the interference control by the cooperation manager 100 is started. Sensing for capturing the movement of a macro cell terminal that has already been identified as a protection target may be performed only at a resource location recommended (narrowed down) from the cooperation manager 100. On the other hand, sensing for capturing the appearance of a new macro cell terminal to be protected may be performed at a relatively low frequency for a wider resource location.
- the communication control unit 246 controls wireless communication between the small cell base station 200 and the small cell terminal. For example, the communication control unit 246 broadcasts a synchronization signal and system information for cell search and synchronization according to the setting by the setting unit 242. Moreover, the communication control part 246 allocates the resource block on a data channel to each small cell terminal. Then, the communication control unit 246 causes the radio communication unit 210 to receive an uplink signal and transmit a downlink signal according to the assignment. When the access type of the small cell is a closed access type, the communication control unit 246 accepts or denies access from the user terminal using a list of user terminals stored in advance.
- the communication control unit 246 suppresses interference given to the macro cell terminal according to the received interference control signal.
- the interference control signal includes scheduling information indicating radio resources allocated to the macro cell terminal to be protected.
- the communication control unit 246 allocates a radio resource different from the radio resource indicated by the scheduling information to the small cell terminal. According to such a simple resource separation method, even if the small cell base station 200 does not know the identification information or the position of the macro cell terminal, the macro cell terminal that may receive interference from the small cell is appropriately selected. Can be protected.
- the communication control unit 246 may exclude the radio resource from the allocation target.
- the coordination manager 100 requests the communication control unit 246 to accept a connection (that is, a handover) of a specific macro cell terminal to the own cell
- the communication control unit 246 adds the macro cell terminal to the list of allowed user terminals. to add.
- the macro cell terminal can perform handover from the macro cell to the small cell (the own cell for the small cell base station 200).
- the communication control unit 246 may reject the handover acceptance request from the cooperation manager 100 when any condition (for example, conditions related to quality requirements, location, device type, etc.) is not satisfied.
- FIG. 8A is a sequence diagram showing a first example of the overall flow of communication control processing according to the present embodiment.
- the communication control process illustrated in FIG. 8A involves the cooperation manager 100, the small cell base station 200, the small cell terminal (UE), and the macro cell base station (eNB).
- UE small cell terminal
- eNB macro cell base station
- the cooperation manager 100 exchanges information with one or more macro cell base stations periodically or on a request basis (step S100).
- the information exchanged here may include scheduling information for the macro cell.
- an initial setup procedure is performed between the small cell base station 200 and the cooperation manager 100 (step S120).
- the setting unit 242 of the small cell base station 200 transmits small cell related information that may include access type information to the cooperation manager 100 (step S120).
- a sensing request is transmitted from the cooperation manager 100 to the small cell base station 200 (step S125).
- the small cell base station 200 (and the small cell terminal) senses an uplink signal from user terminals around the small cell (step S130). And the measurement part 244 of the small cell base station 200 reports a sensing result to the cooperation manager 100 (step S135).
- the determination unit 132 of the cooperation manager 100 determines whether the access type of the small cell operated by the small cell base station 200 is a closed access type or an open access type (step S140). Further, when the identification unit 134 determines that the access type is a closed access type, the identification unit 134 collates the reported sensing result with the scheduling information provided from the macro cell base station, thereby determining the macro cell terminal to be protected. Identify (step S150). And the interference control part 136 determines the control content for suppressing the interference from the small cell to the identified macrocell terminal (step S160). The interference control process in the cooperation manager 100 corresponding to steps S140 to S160 here will be described in detail later.
- the cooperation manager 100 transmits an interference control signal to the small cell base station 200 according to the control content determined in step S160 (step S170).
- the interference control signal transmitted here may include, for example, scheduling information about a macro cell terminal to be protected or a handover acceptance request.
- the cooperation manager 100 may transmit recommended sensing information indicating a resource position to be sensed by the small cell base station 200 to the small cell base station 200 (step S180).
- Step S190 Thereafter, under the control of the communication control unit 246 of the small cell base station 200, data transmission / reception is performed between the small cell base station 200 and one or more small cell terminals, and continuous sensing is performed. (Step S190).
- FIG. 8B is a sequence diagram illustrating a second example of the overall flow of communication control processing according to the present embodiment.
- the cooperation manager 100 exchanges information with one or more macro cell base stations periodically or on a request basis (step S100).
- the information exchanged here may include scheduling information for the macro cell.
- the small cell base station 200 detects a synchronization channel from the macro cell base station and synchronizes with the macro cell (step S110). And the small cell base station 200 (and small cell terminal) senses the uplink signal from the user terminal around the small cell (step S115).
- the small cell base station 200 recognizes the necessity of interference control.
- an initial setup procedure is performed between the small cell base station 200 and the cooperation manager 100 (step S120).
- the setting unit 242 of the small cell base station 200 transmits small cell related information that may include access type information to the cooperation manager 100.
- the measurement part 244 of the small cell base station 200 reports a sensing result to the cooperation manager 100 (step S135).
- the identification of the macro cell terminal to be protected in step S150 may be performed by the macro cell base station instead of the cooperation manager 100.
- FIG. 9 is a flowchart illustrating an example of the flow of interference control processing executed by the cooperation manager 100 according to the present embodiment.
- the determination unit 132 determines whether the access type of the small cell operated by the small cell base station 200 is a closed access type or an open access type (step S140).
- the access type of the small cell is an open access type
- the macro cell terminal can always hand over to the small cell, and the subsequent interference control process is skipped.
- the identification unit 134 acquires a sensing result for the uplink signal from the small cell base station 200 (step S145). And the identification part 134 identifies the macrocell terminal which should be protected by collating the acquired sensing result with the past scheduling information of a macrocell (step S150).
- the interference control unit 136 determines whether a small cell communication opportunity is sufficiently ensured even if scheduling by the small cell is restricted in order to protect the macro cell terminal (step S160). For example, when the number of macro cell terminals to be protected is larger than a predetermined threshold, or when a resource block exceeding a predetermined threshold is consumed by the macro cell terminals to be protected, the communication opportunity of the small cell is It may be determined that sufficient is not secured. If the interference control unit 136 determines that a small cell communication opportunity is sufficiently secured, the interference control unit 136 transmits scheduling information indicating a resource position where scheduling is limited to the small cell base station 200 (step S162). On the other hand, if the interference control unit 136 determines that the communication opportunity of the small cell is not sufficiently ensured, the interference control unit 136 requests the small cell base station 200 to accept the handover of the macro cell terminal (step S164).
- FIG. 10 is an explanatory diagram for explaining an example of a result of executing the processing described in this section after the situation illustrated in FIG.
- the small cells 14a, 14b, and 14c operated by the small cell base stations 16a, 16b, and 16c, respectively, are shown again.
- the access type of the small cells 14a and 14c is a closed access type
- the access type of the small cell 14b is an open access type.
- a black circle surrounded by a circle is a macro cell terminal protected by the resource separation method.
- the macro cell terminal 12a is identified as a terminal to be protected. Accordingly, the small cell base station 16a allocates radio resources different from the radio resources allocated to the macro cell terminal 12a to the small cell terminals in the small cell 14a. As a result, there is no macro cell terminal that receives interference exceeding the allowable level from the small cell 14a.
- the terminals 12b and 12c connected to the macro cell in the example of FIG. 1 are handed over to the small cell 14b.
- the transmission power of the small cell base station 16b is not reduced but rather increased, and the coverage of the small cell 14b is slightly expanded.
- the terminals 12e and 12f connected to the macro cell in the example of FIG. 1 are handed over to the small cell 14c. This is because the small cell base station 16c has accepted the handover acceptance request from the cooperation manager 100.
- the macro cell terminals 12d and 12g are identified as terminals to be protected. Accordingly, the small cell base station 16c allocates a radio resource different from the radio resource allocated to the macro cell terminal 12d or 12g to the small cell terminal in the small cell 14c. As a result, there is no macro cell terminal that receives interference exceeding the allowable level from the small cell 14c.
- Such interference control can effectively suppress interference between the macro cell and the small cell without impairing the communication capacity of the entire system.
- the small cell access type is determined by the cooperation manager. Then, when the access type is a closed access type, a macro cell terminal that may receive interference due to a radio signal from the small cell is identified, and the interference to the identified macro cell terminal is detected by the small cell base station. It is suppressed. In this way, by limiting the small cells to be subjected to interference control based on the access type, it is possible to avoid an unnecessary decrease in the communication capacity of the small cells as a result of the interference control.
- the macro cell terminal to be protected is identified by collating the sensing result of the uplink signal from the user terminal around the small cell with the scheduling information of the macro cell. According to such a method, the macro cell terminal to be protected can be appropriately identified even if the cooperation manager and the small cell base station do not know the position of each terminal. In this case, it is not necessary to signal the location data and calculate parameters such as distance to identify the macro cell terminal to be protected, so the overhead for interference control processing is reduced and the system load is reduced. Is done.
- the resource position where continuous sensing should be performed in the small cell is narrowed down according to information notified from the cooperation manager. Therefore, the communication capacity of the small cell can be prevented from decreasing due to the execution of sensing.
- a series of control processing by each device described in this specification may be realized using any of software, hardware, and a combination of software and hardware.
- a program constituting the software is stored in advance in a storage medium provided inside or outside each device.
- Each program is read into a RAM at the time of execution, for example, and executed by a processor such as a CPU.
- a determination unit that determines whether an access type of a small cell that at least partially overlaps a macro cell of a wireless communication system is a closed access type or an open access type; An identification unit for identifying a user terminal of the macro cell to be protected from interference caused by a radio signal from the small cell when it is determined that the access type of the small cell is a closed access type; An interference control unit that transmits an interference control signal to a base station of the small cell so that interference with the user terminal identified by the identification unit is suppressed; A communication control device comprising: (2) The identification unit identifies a user terminal of the macro cell to be protected based on a sensing result received from a base station of the small cell for an uplink signal from a user terminal around the small cell.
- the communication control device according to (1). (3) The interference control unit transmits scheduling information of the macro cell to a base station of the small cell so that a radio resource different from a radio resource allocated to a user terminal to be protected is used in the small cell; The communication control device according to (1) or (2). (4) The interference control unit accepts connection of at least one user terminal to the small cell depending on a number of user terminals to be protected or a ratio of radio resources used by the user terminal. 4. The communication control device according to any one of (1) to (3), wherein a request is made to a base station. (5) The said interference control part is a communication control apparatus as described in said (2) which notifies the resource position where the said uplink signal is transmitted by the user terminal which should be protected to the base station of the said small cell.
- the communication control apparatus includes an acknowledgment signal for a downlink signal.
- the communication control device includes an authentication signal when a user terminal to be protected uses a broadcast service.
- the said control part is a communication control apparatus as described in said (2) which identifies the user terminal of the said macrocell which should be protected by collating the scheduling information of the said macrocell, and the said sensing result.
- (9) Determining whether the access type of a small cell that at least partially overlaps a macro cell of a wireless communication system is a closed access type or an open access type; Identifying a user terminal of the macro cell to be protected from interference due to radio signals from the small cell when it is determined that the access type of the small cell is a closed access type; Transmitting an interference control signal to the base station of the small cell so that interference to the identified user terminal is suppressed; Including a communication control method. (10) Closed access type small cell base station, The access type of the base station is a closed access type to a control node that controls interference between the macro cell and the small cell when the small cell overlaps at least partially with a macro cell of a wireless communication system.
- a control unit for controlling communication in the cell A base station comprising: (11) In a closed access type small cell base station, The access type of the base station is a closed access type to a control node that controls interference between the macro cell and the small cell when the small cell overlaps at least partially with a macro cell of a wireless communication system.
- the small cell according to an interference control signal transmitted from the control node in response to the notification so that interference to a user terminal of the macro cell to be protected from interference caused by radio signals from the small cell is suppressed. Controlling communication within the cell; Including a communication control method.
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Abstract
Description
1.システムの概要
1-1.スモールセルの例
1-2.協調マネージャ(CM)の配置
2.協調マネージャの構成
3.スモールセル基地局の構成
4.処理の流れ
4-1.システム全体の処理
4-2.協調マネージャによる通信制御処理
5.まとめ
[1-1.スモールセルの例]
まず、図1及び図2を用いて、システムの概要について説明する。図1には、一例としての無線通信システム1が示されている。無線通信システム1は、例えば、LTE、W-CDMA、CDMA2000、WiMAX又はLTE-Aなどの任意のセルラ無線通信方式に基づくシステムであってよい。
協調マネージャは、スモールセル基地局との間で通信可能ないずれの通信ノード上に配置されてもよい。図2は、協調マネージャの配置のいくつかの例について説明するための説明図である。図2には、LTEベースのネットワークアーキテクチャが一例として示されている。LTEベースのネットワークアーキテクチャにおいて、マクロセル10の基地局(eNB)11は、コアネットワーク20と接続される。コアネットワーク20は、例えばP-GW、S-GW及びMMEを含むEPC(Evolved Packet Core)として実装される。コアネットワーク20は、さらに外部ネットワーク30に接続される。外部ネットワーク30は、PDN(Packet Data Network)とも呼ばれるIP(Internet Protocol)ネットワークであり、外部ネットワーク30上には様々なアプリケーション(AP)サーバが実装され得る。
・HSS(Home Subscriber Server):加入者の識別情報、プロフィール情報及び認証情報などを管理するサーバである。
・MME(Mobility Management Entity):UEとの間でNAS(Non Access Stratum)信号を送受信し、モビリティ管理、セッション管理及びページングなどを行うエンティティである。複数のeNBと接続される。
・P-GW(PDN-Gateway):EPCとPDNとの間の接続点に位置し、UEへのIPアドレスの割当て、IPヘッダの付与及び削除などを行うゲートウェイである。課金管理を行う場合もある。
・S-GW(Serving-Gateway):E-UTRANとEPCとの間の接続点に位置し、ユーザプレーンのパケットをルーティングするゲートウェイである。UEがeNB間又はUTRAN間でハンドオーバする場合には、S-GWがアンカーポイントとなる。
・eNB(evolved Node B):マクロセル内の無線リンクを実現する基地局である。無線リソース管理(RRM:Radio Resource Management)、無線ベアラ制御及びスケジューリングなどを行う。
図3は、協調マネージャ100の構成の一例を示すブロック図である。図3を参照すると、協調マネージャ100は、通信部110、記憶部120及び制御部130を備える。
通信部110は、協調マネージャ100による他のノードとの間の通信のための通信モジュールである。通信部110は、アンテナ及びRF(Radio Frequency)回路を含む無線通信モジュールを含んでもよく、又はLAN(Local Area Network)接続端子などの有線通信モジュールを含んでもよい。
記憶部120は、ハードディスク又は半導体メモリなどの記憶媒体を用いて、協調マネージャ100の動作のためのプログラム及びデータを記憶する。例えば、記憶部120は、スモールセル基地局から受信されるスモールセル関連情報を記憶する。スモールセル関連情報は、例えば、スモールセル基地局の識別情報及び位置などを含み得る。また、記憶部120は、マクロセル基地局から受信されるスケジューリング情報をも記憶し得る。
制御部130は、CPU(Central Processing Unit)又はDSP(Digital Signal Processor)などのプロセッサに相当する。制御部130は、記憶部120又は他の記憶媒体に記憶されるプログラムを実行することにより、協調マネージャ100の様々な機能を動作させる。本実施形態において、制御部130は、判定部132、識別部134及び干渉制御部136という3つの機能モジュールを有する。
あるマクロセル内にスモールセルが設置されると、スモールセルの初期セットアップが行われる。その初期セットアップ手続の中で(又はより後の段階で)、スモールセル基地局は、スモールセル関連情報を協調マネージャ100へ登録する。判定部132は、新たなスモールセル基地局を認識すると、当該スモールセル基地局により運用されるスモールセルのアクセスタイプがクローズドアクセスタイプ及びオープンアクセスタイプのいずれであるかを判定する。アクセスタイプの判定は、スモールセル関連情報に直接的に含まれ得るアクセスタイプ情報に基づいて行われてもよく、又はスモールセル基地局の識別情報をキーとしてデータベースへの問合せを実行することにより行われてもよい。
識別部134は、スモールセルのアクセスタイプがクローズドアクセスタイプであると判定された場合に、当該スモールセルからの無線信号に起因する干渉から保護されるべきマクロセル端末を識別する。より具体的には、本実施形態において、識別部134は、スモールセル基地局から受信されるセンシング結果に基づいて、保護されるべきマクロセル端末を識別する。ここでのセンシングとは、典型的には、スモールセルの周辺(例えば、スモールセルの内部及びその近傍)に位置するユーザ端末からのアップリンク信号についての信号レベルの測定をいう。スモールセル基地局は、自発的にセンシングを実行してもよい。その代わりに、識別部134がスモールセル基地局へセンシングを要求してもよい。
干渉制御部136は、識別部134により識別されるマクロセル端末への干渉が抑制されるように、対応するスモールセルからの無線信号に起因する干渉を制御する。例えば、干渉制御部136は、保護されるべきマクロセル端末に割当てられる無線リソースとは異なる無線リソースがスモールセルにおいて使用されるように、スモールセル基地局へマクロセルのスケジューリング情報を送信する。
スモールセル基地局200は、上述した協調マネージャ100と共に通信制御システムを構成する。図7は、一実施形態に係るスモールセル基地局200の構成の一例を示すブロック図である。図7を参照すると、スモールセル基地局200は、無線通信部210、ネットワーク通信部220、記憶部230及び制御部240を備える。
無線通信部210は、スモールセル端末へ無線通信サービスを提供するための無線通信モジュールである。無線通信部210は、アンテナ及びRF回路を含む。無線通信部210は、後に説明する通信制御部246によるスケジューリングに従って、1つ以上のスモールセル端末との間で無線信号を送受信する。
ネットワーク通信部220は、スモールセル基地局200と協調マネージャ100などの制御ノードとの間の通信のための通信モジュールである。ネットワーク通信部220は、無線通信部210と共通化され得る無線通信モジュールを含んでもよく、又はLAN接続端子などの有線通信モジュールを含んでもよい。
記憶部230は、ハードディスク又は半導体メモリなどの記憶媒体を用いて、スモールセル基地局200の動作のためのプログラム及びデータを記憶する。例えば、スモールセル基地局200により運用されるスモールセルのアクセスタイプがクローズドアクセスタイプである場合には、記憶部230は、接続を受け入れるユーザ端末の識別情報のリストを予め記憶する。また、記憶部230は、協調マネージャ100から提供されるマクロセル(及び隣接スモールセル)のスケジューリング情報をも記憶し得る。
制御部240は、CPU又はDSPなどのプロセッサに相当する。制御部240は、記憶部230又は他の記憶媒体に記憶されるプログラムを実行することにより、スモールセル基地局200の様々な機能を動作させる。本実施形態において、制御部240は、設定部242、測定部244及び通信制御部246という3つの機能モジュールを有する。
設定部242は、スモールセル基地局200により運用される無線通信サービスをセットアップする。例えば、設定部242は、マクロセル内にスモールセル基地局200が設置されると、協調マネージャ100を検索し、検出された協調マネージャ100へスモールセル関連情報を送信する。スモールセル関連情報は、例えば、当該スモールセルのアクセスタイプを示すアクセスタイプ情報を含んでもよい。当該スモールセルのアクセスタイプがクローズドアクセスタイプである場合には、後に説明する通信制御部246は、協調マネージャ100による制御に従って、マクロセル端末に与える干渉を抑制する。
測定部244は、スモールセルの周辺のユーザ端末からのアップリンク信号をセンシングする。測定部244は、設定部242によるスモールセルの初期セットアップが完了した後、自発的にセンシングを実行してもよい。その代わりに、測定部244は、協調マネージャ100からの要求に応じてセンシングを実行してもよい。また、測定部244は、自らのセンシングに加えて(又はその代わりに)、スモールセル基地局200に接続するスモールセル端末にセンシングの実行を要求してもよい。センシングの結果は、測定部244により取りまとめられ、協調マネージャ100へ送信される。
通信制御部246は、スモールセル基地局200とスモールセル端末との間の無線通信を制御する。例えば、通信制御部246は、設定部242による設定に従って、セルサーチ及び同期のための同期信号並びにシステム情報をブロードキャストする。また、通信制御部246は、データチャネル上のリソースブロックを各スモールセル端末に割当てる。そして、通信制御部246は、割当てに従って無線通信部210によりアップリンク信号を受信させ及びダウンリンク信号を送信させる。スモールセルのアクセスタイプがクローズドアクセスタイプである場合には、通信制御部246は、予め記憶されるユーザ端末のリストを用いて、ユーザ端末からのアクセスを容認し又は拒否する。
[4-1.システム全体の処理]
(1)第1の例
図8Aは、本実施形態に係る通信制御処理の全体的な流れの第1の例を示すシーケンス図である。図8Aに示した通信制御処理には、協調マネージャ100、スモールセル基地局200、スモールセル端末(UE)及びマクロセル基地局(eNB)が関与する。
図8Bは、本実施形態に係る通信制御処理の全体的な流れの第2の例を示すシーケンス図である。
図9は、本実施形態に係る協調マネージャ100により実行される干渉制御処理の流れの一例を示すフローチャートである。
図10は、図1に例示した状況の後、本節において説明した処理が実行された結果の一例について説明するための説明図である。図10を参照すると、スモールセル基地局16a、16b及び16cによりそれぞれ運用されるスモールセル14a、14b及び14cが再び示されている。ここで、スモールセル14a及び14cのアクセスタイプはクローズドアクセスタイプであり、スモールセル14bのアクセスタイプはオープンアクセスタイプであるものとする。図中で円に囲まれた黒丸は、リソース分離方式によって保護されるマクロセル端末である。
ここまで、図1~図10を用いて、本開示に係る技術の実施形態を詳細に説明した。上述した実施形態によれば、協調マネージャにより、スモールセルのアクセスタイプが判定される。そして、当該アクセスタイプがクローズドアクセスタイプである場合に、スモールセルからの無線信号に起因する干渉を受ける可能性のあるマクロセル端末が識別され、識別されたマクロセル端末への干渉がスモールセル基地局によって抑制される。このように干渉制御の対象のスモールセルをアクセスタイプに基づいて限定することで、干渉制御の結果としてスモールセルの通信容量が不必要に減少してしまうことを回避することができる。
(1)
無線通信システムのマクロセルに少なくとも部分的に重複するスモールセルのアクセスタイプがクローズドアクセスタイプ及びオープンアクセスタイプのいずれであるかを判定する判定部と、
前記スモールセルのアクセスタイプがクローズドアクセスタイプであると判定された場合に、前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末を識別する識別部と、
前記識別部により識別される前記ユーザ端末への干渉が抑制されるように、前記スモールセルの基地局へ干渉制御信号を送信する干渉制御部と、
を備える通信制御装置。
(2)
前記識別部は、前記スモールセルの周辺のユーザ端末からのアップリンク信号についての、前記スモールセルの基地局から受信されるセンシング結果に基づいて、保護されるべき前記マクロセルのユーザ端末を識別する、前記(1)に記載の通信制御装置。
(3)
前記干渉制御部は、保護されるべきユーザ端末に割当てられる無線リソースとは異なる無線リソースが前記スモールセルにおいて使用されるように、前記スモールセルの基地局へ前記マクロセルのスケジューリング情報を送信する、前記(1)又は前記(2)に記載の通信制御装置。
(4)
前記干渉制御部は、保護されるべきユーザ端末の数又は当該ユーザ端末により使用される無線リソースの割合に依存して、少なくとも1つのユーザ端末の前記スモールセルへの接続を受け入れることを前記スモールセルの基地局へ要求する、前記(1)~(3)のいずれか1項に記載の通信制御装置。
(5)
前記干渉制御部は、保護されるべきユーザ端末により前記アップリンク信号が送信されるリソース位置を、前記スモールセルの基地局へ通知する、前記(2)に記載の通信制御装置。
(6)
前記アップリンク信号は、ダウンリンク信号に対する確認応答信号を含む、前記(5)に記載の通信制御装置。
(7)
前記アップリンク信号は、保護されるべきユーザ端末が放送サービスを利用する際の認証信号を含む、前記(5)に記載の通信制御装置。
(8)
前記識別部は、前記マクロセルのスケジューリング情報と前記センシング結果とを照合することにより、保護されるべき前記マクロセルのユーザ端末を識別する、前記(2)に記載の通信制御装置。
(9)
無線通信システムのマクロセルに少なくとも部分的に重複するスモールセルのアクセスタイプがクローズドアクセスタイプ及びオープンアクセスタイプのいずれであるかを判定することと、
前記スモールセルのアクセスタイプがクローズドアクセスタイプであると判定された場合に、前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末を識別することと、
識別された前記ユーザ端末への干渉が抑制されるように、前記スモールセルの基地局へ干渉制御信号を送信することと、
を含む通信制御方法。
(10)
クローズドアクセスタイプのスモールセルの基地局であって、
無線通信システムのマクロセルに前記スモールセルが少なくとも部分的に重複する場合に、前記マクロセルと前記スモールセルとの間の干渉を制御する制御ノードへ前記基地局のアクセスタイプがクローズドアクセスタイプであることを通知し、
前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末への干渉が抑制されるように、前記通知に応じて前記制御ノードから送信される干渉制御信号に従って、前記スモールセル内の通信を制御する制御部、
を備える基地局。
(11)
クローズドアクセスタイプのスモールセルの基地局において、
無線通信システムのマクロセルに前記スモールセルが少なくとも部分的に重複する場合に、前記マクロセルと前記スモールセルとの間の干渉を制御する制御ノードへ前記基地局のアクセスタイプがクローズドアクセスタイプであることを通知することと、
前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末への干渉が抑制されるように、前記通知に応じて前記制御ノードから送信される干渉制御信号に従って、前記スモールセル内の通信を制御することと、
を含む通信制御方法。
11 マクロセル基地局
14a~14c スモールセル
16a~16c スモールセル基地局
100 協調マネージャ(通信制御装置)
132 判定部
134 識別部
136 干渉制御部
200 スモールセル基地局
Claims (11)
- 無線通信システムのマクロセルに少なくとも部分的に重複するスモールセルのアクセスタイプがクローズドアクセスタイプ及びオープンアクセスタイプのいずれであるかを判定する判定部と、
前記スモールセルのアクセスタイプがクローズドアクセスタイプであると判定された場合に、前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末を識別する識別部と、
前記識別部により識別される前記ユーザ端末への干渉が抑制されるように、前記スモールセルの基地局へ干渉制御信号を送信する干渉制御部と、
を備える通信制御装置。 - 前記識別部は、前記スモールセルの周辺のユーザ端末からのアップリンク信号についての、前記スモールセルの基地局から受信されるセンシング結果に基づいて、保護されるべき前記マクロセルのユーザ端末を識別する、請求項1に記載の通信制御装置。
- 前記干渉制御部は、保護されるべきユーザ端末に割当てられる無線リソースとは異なる無線リソースが前記スモールセルにおいて使用されるように、前記スモールセルの基地局へ前記マクロセルのスケジューリング情報を送信する、請求項1に記載の通信制御装置。
- 前記干渉制御部は、保護されるべきユーザ端末の数又は当該ユーザ端末により使用される無線リソースの割合に依存して、少なくとも1つのユーザ端末の前記スモールセルへの接続を受け入れることを前記スモールセルの基地局へ要求する、請求項1に記載の通信制御装置。
- 前記干渉制御部は、保護されるべきユーザ端末により前記アップリンク信号が送信されるリソース位置を、前記スモールセルの基地局へ通知する、請求項2に記載の通信制御装置。
- 前記アップリンク信号は、ダウンリンク信号に対する確認応答信号を含む、請求項5に記載の通信制御装置。
- 前記アップリンク信号は、保護されるべきユーザ端末が放送サービスを利用する際の認証信号を含む、請求項5に記載の通信制御装置。
- 前記識別部は、前記マクロセルのスケジューリング情報と前記センシング結果とを照合することにより、保護されるべき前記マクロセルのユーザ端末を識別する、請求項2に記載の通信制御装置。
- 無線通信システムのマクロセルに少なくとも部分的に重複するスモールセルのアクセスタイプがクローズドアクセスタイプ及びオープンアクセスタイプのいずれであるかを判定することと、
前記スモールセルのアクセスタイプがクローズドアクセスタイプであると判定された場合に、前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末を識別することと、
識別された前記ユーザ端末への干渉が抑制されるように、前記スモールセルの基地局へ干渉制御信号を送信することと、
を含む通信制御方法。 - クローズドアクセスタイプのスモールセルの基地局であって、
無線通信システムのマクロセルに前記スモールセルが少なくとも部分的に重複する場合に、前記マクロセルと前記スモールセルとの間の干渉を制御する制御ノードへ前記基地局のアクセスタイプがクローズドアクセスタイプであることを通知し、
前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末への干渉が抑制されるように、前記通知に応じて前記制御ノードから送信される干渉制御信号に従って、前記スモールセル内の通信を制御する制御部、
を備える基地局。 - クローズドアクセスタイプのスモールセルの基地局において、
無線通信システムのマクロセルに前記スモールセルが少なくとも部分的に重複する場合に、前記マクロセルと前記スモールセルとの間の干渉を制御する制御ノードへ前記基地局のアクセスタイプがクローズドアクセスタイプであることを通知することと、
前記スモールセルからの無線信号に起因する干渉から保護されるべき前記マクロセルのユーザ端末への干渉が抑制されるように、前記通知に応じて前記制御ノードから送信される干渉制御信号に従って、前記スモールセル内の通信を制御することと、
を含む通信制御方法。
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US14/381,285 US9374830B2 (en) | 2012-03-05 | 2013-01-29 | Communication control device, communication control method, and base station |
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CA2863032A CA2863032A1 (en) | 2012-03-05 | 2013-01-29 | Communication control device, communication control method, and base station |
RU2014135385/07A RU2581605C2 (ru) | 2012-03-05 | 2013-01-29 | Устройство управления передачей данных, способ управления передачей данных и базовая станция |
MX2014010408A MX2014010408A (es) | 2012-03-05 | 2013-01-29 | Dispositivo de control de comunicacion, metodo de control de comunicacion y estacion de base. |
JP2014503715A JP5924400B2 (ja) | 2012-03-05 | 2013-01-29 | 通信制御装置、通信制御方法及び基地局 |
CN201380011793.0A CN104137591B (zh) | 2012-03-05 | 2013-01-29 | 通信控制装置、通信控制方法以及基站 |
AU2013228834A AU2013228834B2 (en) | 2012-03-05 | 2013-01-29 | Communication control device, communication control method, and base station |
KR1020147021599A KR20140143741A (ko) | 2012-03-05 | 2013-01-29 | 통신 제어 장치, 통신 제어 방법 및 기지국 |
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Also Published As
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KR20140143741A (ko) | 2014-12-17 |
EP2824955B1 (en) | 2019-01-02 |
AU2013228834A1 (en) | 2014-07-24 |
JP5924400B2 (ja) | 2016-05-25 |
CA2863032A1 (en) | 2013-09-12 |
EP2824955A1 (en) | 2015-01-14 |
RU2581605C2 (ru) | 2016-04-20 |
MX2014010408A (es) | 2014-09-22 |
US20150094075A1 (en) | 2015-04-02 |
US9374830B2 (en) | 2016-06-21 |
CN104137591A (zh) | 2014-11-05 |
JP6164333B2 (ja) | 2017-07-19 |
AU2013228834B2 (en) | 2017-05-04 |
JPWO2013132920A1 (ja) | 2015-07-30 |
IN2014DN07238A (ja) | 2015-04-24 |
RU2014135385A (ru) | 2016-03-20 |
US9794948B2 (en) | 2017-10-17 |
JP2016154379A (ja) | 2016-08-25 |
EP2824955A4 (en) | 2016-01-27 |
US20160278100A1 (en) | 2016-09-22 |
CN104137591B (zh) | 2018-04-06 |
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