WO2015098228A1 - 無線通信装置、通信制御装置、無線通信方法及び通信制御方法 - Google Patents
無線通信装置、通信制御装置、無線通信方法及び通信制御方法 Download PDFInfo
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- WO2015098228A1 WO2015098228A1 PCT/JP2014/076623 JP2014076623W WO2015098228A1 WO 2015098228 A1 WO2015098228 A1 WO 2015098228A1 JP 2014076623 W JP2014076623 W JP 2014076623W WO 2015098228 A1 WO2015098228 A1 WO 2015098228A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
Definitions
- the present disclosure relates to a wireless communication device, a communication control device, a wireless communication method, and a communication control method.
- Non-Patent Document 1 As shown in Non-Patent Document 1 below, it is considered to disperse traffic by installing a large number of small cells in a macro cell and increasing the network density. Such a technique for utilizing a small cell is called small cell enhancement. Also in the proposal of the fifth generation wireless communication system, as shown in Non-Patent Document 2 below, introduction of an ultra-dense network that uses a higher frequency and wider bandwidth than the existing network is foreseen. ing.
- the small cell is a concept that can include various types of cells smaller than the macro cell (for example, femto cell, nano cell, pico cell, and micro cell) that are arranged overlapping the macro cell.
- the small cell is operated by a dedicated base station.
- the small cell is operated by a terminal serving as a master device temporarily operating as a small cell base station.
- So-called relay nodes can also be considered as a form of small cell base station. In an environment where such a small cell is operated, efficient use of radio resources and provision of a low-cost device are important viewpoints.
- the small cell base station typically relays traffic between the macro cell base station and the terminal.
- a link between the small cell base station and the macro cell base station is referred to as a backhaul link.
- a link between the small cell base station and the terminal is called an access link.
- the backhaul link is a radio link, by operating the radio backhaul link and the access link in a time division manner, it is possible to avoid the radio signals of these links from interfering with each other.
- Non-Patent Document 3 the idea of full-duplex wireless communication as proposed in Non-Patent Document 3 is introduced to the small cell base station, and the wireless backhaul link and the access link are simultaneously connected on the same channel. If it can be operated, radio resources can be used more efficiently. However, such operation causes not only self-interference due to the sneak in the transmission signal in the small cell base station but also harmful interference in the terminal connected to the small cell base station via the access link.
- the self-interference in the small cell base station can be removed by applying a self-interference cancellation (SIC) technique described in Non-Patent Document 3, for example.
- SIC self-interference cancellation
- an effective method for appropriately handling interference on a desired signal received on the access link due to transmission on the wireless backhaul link has not yet been proposed.
- the technology according to the present disclosure is a mechanism for protecting a terminal connected to a small cell from harmful interference when the idea of full-duplex wireless communication is applied to the wireless backhaul link and the access link of the small cell. It aims at realizing.
- a wireless communication unit that communicates via an access link between a base station and a master terminal that is connected via a wireless backhaul link, transmission on the wireless backhaul link, and on the access link A second received signal resulting from a transmission on the radio backhaul link that interferes with a first received signal on the access link when transmission on the same channel is performed simultaneously on the same channel;
- a wireless communication device including a signal processing unit that removes interference using a difference-based interference cancellation technique.
- the wireless communication apparatus when transmission from the base station to the master terminal on the wireless backhaul link and transmission from the master terminal to the wireless communication device on the access link are simultaneously performed on the same channel
- the wireless communication apparatus removes a second received signal caused by transmission on the wireless backhaul link that interferes with the first received signal on the access link using an interference cancellation technique based on a received power difference. Therefore, a communication control device including a control unit that controls transmission power of the base station and transmission power of the master terminal is provided.
- a wireless communication apparatus that communicates via an access link between a base station and a master terminal that is connected via a wireless backhaul link, transmission and access on the wireless backhaul link A second received signal resulting from a transmission on the radio backhaul link that interferes with a first received signal on the access link when transmission on the link is performed simultaneously on the same channel;
- a wireless communication method is provided that includes using an interference cancellation technique based on a received power difference.
- the wireless communication apparatus when transmission from the base station to the master terminal on the wireless backhaul link and transmission from the master terminal to the wireless communication device on the access link are simultaneously performed on the same channel
- the wireless communication apparatus removes a second received signal caused by transmission on the wireless backhaul link that interferes with the first received signal on the access link using an interference cancellation technique based on a received power difference.
- a communication control method is provided that includes controlling the transmission power of the base station and the transmission power of the master terminal by a communication control device.
- FIG. 8 It is a figure which shows an example of the flow of the data transmission / reception in a communication control system. It is a sequence diagram which shows an example of the flow of the communication control process performed in the communication control system which concerns on this embodiment. It is a flowchart which shows an example of the detailed flow of the setting of FD pair shown in FIG. 8, and transmission power control. It is a flowchart which shows an example of the detailed flow of the interference removal shown in FIG. It is a block diagram which shows an example of a schematic structure of a server. It is a block diagram which shows the 1st example of schematic structure of eNB. It is a block diagram which shows an example of a schematic structure of a smart phone. It is a block diagram which shows an example of a schematic structure of a car navigation apparatus.
- FIG. 1 is an explanatory diagram for describing an overview of a communication control system 1 according to an embodiment of the technology according to the present disclosure.
- the communication control system 1 includes a communication control device 10 and wireless communication devices 20a and 20b.
- the communication control device 10 is a device that cooperatively controls wireless communication in a macro cell and a small cell.
- the communication control apparatus 10 is a macro cell base station.
- the macro cell base station 10 provides a wireless communication service to one or more terminal devices located inside the macro cell 11.
- the macrocell base station 10 is connected to the core network 15.
- the core network 15 is connected to a packet data network (PDN) 16 via a gateway device (not shown).
- the macro cell 11 is, for example, any wireless communication system such as LTE (Long Term Evolution), LTE-A (LTE-Advanced), GSM (registered trademark), UMTS, W-CDMA, CDMA200, WiMAX, WiMAX2, or IEEE 802.16.
- control node in the core network 15 or the PDN 16 may have a function of cooperatively controlling radio communication in the macro cell and the small cell. Good.
- Each of the wireless communication devices 20a and 20b is a master device that operates a small cell.
- the radio communication device 20a is a small cell base station that is fixedly installed.
- the small cell base station 20a establishes a radio backhaul link 22a with the macro cell base station 10 and an access link 23a with one or more terminal devices in the small cell 21a.
- the wireless communication device 20b is a dynamic AP (access point).
- the dynamic AP 20b is a mobile device that dynamically operates the small cell 21b.
- the dynamic AP 20b establishes a radio backhaul link 22b with the macrocell base station 10 and an access link 23b with one or more terminal devices in the small cell 21b.
- the dynamic AP 20b may be, for example, a terminal device equipped with hardware or software that can operate as a base station or a wireless access point.
- the small cell 21b in this case is a locally formed network (Localized Network).
- the radio communication devices 20a and 20b typically have the authority to allocate radio resources to terminal devices connected to the radio communication devices 20a and 20b. However, in the present embodiment, the assignment of radio resources is at least partially delegated to the communication control apparatus 10 for cooperative control.
- wireless communication apparatus 20 when it is not necessary to distinguish the radio
- the radio communication apparatus 20 may be any type of master device such as a relay station that relays a radio signal in layer 1, layer 2, or layer 3, without being limited to the example of FIG.
- the wireless communication device 20 may have a separate wired backhaul link for control, for example.
- the wireless communication device 20 receives downlink traffic destined for the terminal device in the small cell 21 via the wireless backhaul link 22 and transmits the received traffic to the destination terminal device via the access link 23. To do.
- the wireless communication device 20 receives uplink traffic received from the terminal device in the small cell 21 via the access link 23 and transmits the received traffic via the wireless backhaul link 22.
- the wireless communication device 20 receives the reception on the wireless backhaul link 22 and the transmission on the access link 23, or the reception on the access link 23 and the transmission on the wireless backhaul link 22 are performed in a time division manner, the wireless communication device 20 The received signal and the transmitted signal do not interfere with each other. However, such a time-sharing operation increases the latency for relaying traffic.
- the memory size required for buffering traffic in the master device is also large.
- the above-described interference between the reception signal and the transmission signal can be avoided also by assigning different frequency channels to the radio backhaul link and the access link.
- frequency division operation can be employed only in situations where there are sufficient available frequency resources. In either method, it is difficult to say that the utilization efficiency of radio resources is optimized. Therefore, in the present embodiment, a full duplex (FD) mode is introduced in order to use radio resources more efficiently.
- FD full duplex
- the radio communication device 20 When the radio communication device 20 operates in the FD mode, in the downlink, transmission on the radio backhaul link 22 by the macrocell base station 10 (that is, reception by the radio communication device 20) and on the access link 23 by the radio communication device 20 Are simultaneously transmitted on the same channel.
- the so-called self-interference caused by the transmission signal radiated from the transmission antenna of the wireless communication device 20 wraps around the reception antenna of the wireless communication device 20 is, for example, the SIC (Self Interference Canceller) technique described in Non-Patent Document 3. Can be removed using.
- harmful interference may occur in a terminal connected to the wireless communication device 20 via an access link.
- FIG. 2 illustrates the interference of received signals in the terminal device connected to the wireless communication device 20.
- the terminal device 30 is a slave terminal connected to the wireless communication device 20.
- data included in the signal transmitted from the macrocell base station 10 to the wireless communication device 20 on the wireless backhaul link 22 at time t is relayed by the wireless communication device 20 at time t + dt.
- the terminal device 30 receives the data relayed by the wireless communication device 20 as a reception signal R1 (first reception signal).
- a received signal R2 (second received signal) resulting from signal transmission from the macrocell base station 10 to the wireless communication device 20 on the wireless backhaul link 22 at time t + dt is a terminal device in the small cell 21. 30 may be received.
- the received signal R2 interferes with the received signal R1.
- Interference cancellation technology based on the difference in received power is a basic technology for NOMA (Non-Orthogonal Multiple Access), which is a multiplexing method that allows multiple users to be multiplexed on non-orthogonal frequency channels. Is also attracting attention.
- NOMA Non-Orthogonal Multiple Access
- the interference cancellation technology based on the received power difference is “Andreas Ruegg, and Alberto Tarable,“ Iterative SIC receiver scheme for non-orthogonally superimposed signals on top of OFDMA, ”PIMRC, pages 156-161.IEEE, (2010). Is disclosed.
- the transmitting side transmits signals transmitted to multiple terminals so that a predetermined received power difference is produced at the same (or near enough to lose orthogonality) frequency resources and at the same time. Multiplex by power control. Using this received power difference, the receiving side can separate and decode a desired signal by SIC. Therefore, in the present embodiment, as will be described in detail in the next section, the terminal device 30 uses the interference cancellation technology based on the received power difference to reduce interference between received signals from the macrocell base station 10 and the radio communication device 20. The desired signal is obtained by removing the signal.
- the radio communication device 20 when the radio communication device 20 operates in the FD mode, transmission on the access link 23 by the terminal device 30 and transmission on the radio backhaul link 22 by the radio communication device 20 (that is, the macro cell base station 10 Are received simultaneously on the same channel.
- the transmission power of the radio signal transmitted by the terminal device 30 on the access link 23 is not so large as to cause harmful interference to the macro cell base station 10. Therefore, in the present specification, it will be described how interference between reception signals generated in a slave terminal mainly in the downlink FD mode can be removed. Note that the technology according to the present disclosure may be used for canceling interference in the uplink.
- the wireless communication device 20 may adopt NOMA as a multiplexing method.
- the macro cell base station 10 may adopt NOMA as a communication method as a multiplexing method. That is, the macrocell base station 10 or the radio communication device 20 may multiplex transmission signals to a plurality of terminals by performing transmission power control so that a predetermined reception power difference is obtained in the same frequency resource and the same time. Table 1 below shows an example of a combination of multiplexing schemes in the backhaul link and the access link.
- FIG. 3 is a block diagram illustrating an example of a logical configuration of the communication control apparatus 10 according to the present embodiment.
- the communication control apparatus 10 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130, and a control unit 140.
- the wireless communication unit 110 performs wireless communication with a terminal device connected to the macro cell 11 (hereinafter referred to as a macro cell terminal). For example, the radio communication unit 110 receives uplink traffic from the macro cell terminal and transmits downlink traffic to the macro cell terminal. In addition, the wireless communication unit 110 broadcasts a synchronization signal and a reference signal in the downlink. The synchronization signal is used for the macro cell terminal to acquire synchronization with the macro cell 11. The wireless communication device 20 can also acquire synchronization with the macro cell 11 by searching for the synchronization signal.
- the reference signal is used for measuring communication quality. The communication quality measured using the reference signal is an index for handover determination that triggers handover between macro cells or between a macro cell and a small cell, for example.
- the wireless communication unit 110 establishes a wireless backhaul link 22 with the wireless communication device 20 that operates the small cell 21 in the macro cell 11.
- uplink traffic transmitted from a terminal device connected to the small cell 21 (hereinafter referred to as a small cell terminal) is relayed by the wireless communication device 20 and received by the wireless communication unit 110 on the wireless backhaul link 22.
- the wireless communication unit 110 transmits downlink traffic destined for the small cell terminal to the wireless communication device 20 on the wireless backhaul link 22.
- the downlink traffic is relayed by the wireless communication device 20 to the destination small cell terminal.
- the exchange of control messages between the communication control device 10 and the wireless communication device 20 is also performed on the wireless backhaul link 22.
- the network communication unit 120 is a communication interface for connecting the communication control device 10 to the core network 15.
- the network communication unit 120 may be a wired communication interface or a wireless communication interface.
- the network communication unit 120 transmits and receives data traffic and exchanges control messages with various control nodes in the core network 15.
- the storage unit 130 stores a program and data for the operation of the communication control device 10 using a storage medium such as a hard disk or a semiconductor memory.
- Data stored by the storage unit 130 includes, for example, macro cell information (such as the position of the macro cell base station, the cell radius, the antenna configuration, and the operating frequency band), and master device information (device ID, device type) collected from the wireless communication apparatus 20.
- macro cell information such as the position of the macro cell base station, the cell radius, the antenna configuration, and the operating frequency band
- master device information device ID, device type
- small cell information such as cell radius and number of small cell terminals
- slave device information such as capability information described below
- various control parameters such as transmission power information described below.
- the control unit 140 controls the overall operation of the communication control device 10.
- the control unit 140 includes a macro cell control unit 142 and a cooperative control unit 144.
- the macro cell control unit 142 controls radio communication with the macro cell terminal by the radio communication unit 110.
- the macro cell control unit 142 generates system information such as an operating frequency band and an antenna configuration of the macro cell 11, and broadcasts the generated system information to the wireless communication unit 110.
- the macro cell control unit 142 performs radio resource allocation, transmission power control, retransmission control, and the like for each macro cell terminal.
- the macro cell control unit 142 determines the power indicated by the transmission power information determined by the cooperation control unit 144 described later as the transmission power of the transmission signal transmitted by the wireless communication unit 110.
- the macro cell control unit 142 transfers uplink traffic input from the wireless communication unit 110 to the network communication unit 120.
- the macro cell control unit 142 transfers downlink traffic input from the network communication unit 120 to the radio communication unit 110.
- the macro cell control unit 142 performs retransmission control in wireless communication with the wireless communication device 20. For example, the macro cell control unit 142 transmits the next data or retransmits the same data in response to the ACK response or NACK response from the radio communication device 20.
- the cooperative control unit 144 uses a wireless backhaul link by the communication control device 10 and the wireless communication device 20 in order to promote efficient wireless communication using one or more small cells 21. It is a control entity that controls the use of access links. For example, the cooperative control unit 144 determines whether the wireless communication device 20 should perform wireless communication in the FD mode. When the cooperative control unit 144 determines that the wireless communication should be executed in the FD mode, the cooperative control unit 144 instructs the wireless communication device 20 to operate in the FD mode. On the other hand, when the cooperative control unit 144 determines that the wireless communication device 20 should not perform wireless communication in the FD mode, the cooperative control unit 144 instructs the wireless communication device 20 to operate in the non-FD mode.
- the cooperative control unit 144 controls the transmission power of the communication control device 10 and the transmission power of the wireless communication device 20. Specifically, the cooperative control unit 144 uses the interference cancellation technique based on the reception power difference between the terminal device 30 and the reception signal R2 caused by the transmission on the wireless backhaul link 22 that interferes with the reception signal R1 on the access link 23. The transmission power is controlled so that the transmission power can be removed.
- transmission power control by the cooperative control unit 144 will be described.
- FIG. 4 is an explanatory diagram for explaining an interference cancellation technique based on the received power difference.
- FIG. 4 illustrates received power for each signal component included in the combined signal received by the terminal device 30.
- the reception signal R ⁇ b> 1 is a desired signal component for the terminal device 30.
- the received signal R2 is an interference component.
- the received signal R1 is decodable because the terminal device 30 has the received power 33 necessary for decoding the signal, while the received signal R2 is received signal R1.
- the received power 33 is sufficiently small. Therefore, the terminal device 30 can decode the received signal R1 which is a desired signal without removing the received signal R2.
- the reception signal R1 and the reception signal R2 have reception power 33.
- the reception power of the reception signal R1 is smaller than the reception power of the reception signal R2. Therefore, the terminal device 30 needs to remove interference due to the received signal R2.
- the terminal device 30 can separate each received signal when the received power difference 34 between the received signal R1 and the received signal R2 is equal to or greater than a threshold value. Therefore, the cooperative control unit 144 controls the transmission power of the communication control device 10 and the transmission power of the wireless communication device 20 so that the reception power difference 34 between the reception signal R1 and the reception signal R2 is equal to or greater than the threshold value.
- the cooperative control unit 144 compares the channel state of the radio backhaul link 22 with the channel state of the access link 23 to set either the reception power of the reception signal R1 or the reception power of the reception signal R2 to be larger. Determine what to do.
- the channel state includes a distance between nodes at both ends of each link or a path loss, or a channel quality of each link.
- the terminal device 30 first demodulates a signal having higher received power and then needs the demodulated signal. Accordingly, each received signal can be separated by modulating again and removing the modulated signal from the combined signal.
- the cooperative control unit 144 compares the channel state of the wireless backhaul link 22 with the channel state of the access link 23, and sets the magnitude relationship so that the reception power difference can be more easily provided. For example, in the cooperative control unit 144, the distance (path loss) between the communication control device 10 and the terminal device 30 is shorter (smaller) than the distance (path loss) between the wireless communication device 20 and the terminal device 30. In this case, it may be determined that the received signal R2 should be set larger, and in the opposite case, it may be determined that the received signal R1 should be set larger. Further, the cooperative control unit 144 is configured such that the channel quality of the direct link between the communication control device 10 and the terminal device 30 is better than the channel quality of the access link between the wireless communication device 20 and the terminal device 30.
- reception signal R2 should be set large, and in the opposite case, it may be determined that the reception signal R1 should be set large.
- the channel quality of these links can be recognized by acquiring a measurement report transmitted from the terminal device 30, for example.
- the cooperative control unit 144 can efficiently achieve a reception power difference equal to or greater than a threshold value in the terminal device 30 by setting such a magnitude relationship.
- the cooperative control unit 144 determines the transmission power of the communication control device 10 and the transmission power of the wireless communication device 20 based on the above-described magnitude setting and the channel states of the wireless backhaul link 22 and the access link 23.
- the cooperative control unit 144 notifies the macro cell control unit 142 and the radio communication device 20 of transmission power information indicating the determined transmission power value.
- the cooperative control unit 144 notifies the terminal device 30 of a message indicating which of the received power of the received signal R1 and the received power of the received signal R2 is greater. This message may include, for example, a flag indicating the magnitude relationship, or may include information indicating the reception power value of the reception signal R1 and the reception power value of the reception signal R2.
- the cooperative control unit 144 may transmit this message to the wireless communication device 20 and cause the wireless communication device 20 to transmit the message to the terminal device 30.
- the terminal device 30 can acquire a desired signal by removing the interference signal based on the reception power difference when a signal component having a larger reception power is an interference signal. Further, the terminal device 30 can acquire a desired signal without performing signal processing for removing an interference signal when a signal component having a larger received power is the desired signal.
- the cooperative control unit 144 can achieve both improvement in the use efficiency of radio resources by FD communication and acquisition of a desired signal in the terminal device 30 by controlling transmission power. Subsequently, a process in which the cooperative control unit 144 determines whether to perform the transmission power control described above will be described.
- the cooperative control unit 144 determines whether or not the load information indicating at least one of the traffic volume, the number of terminals, and the resource usage rate indicates a load exceeding a threshold value. For example, when the amount of traffic to be processed exceeds the threshold, the total number of macro cell terminals and small cell terminals or the number of small cell terminals exceeds the threshold, or the resource usage rate exceeds the threshold, the FD mode is used. Thus, the capacity of small cells should be increased. Therefore, the cooperative control unit 144 determines that transmission on the radio backhaul link 22 and the access link 23 should be performed simultaneously on the same channel when the load information described above indicates a load exceeding the threshold.
- the cooperative control unit 144 selects the FD mode as the operation mode of the wireless communication device 20.
- the cooperative control unit 144 selects the non-FD mode as the operation mode of the wireless communication device 20.
- the cooperative control unit 144 can acquire the load information described above by acquiring the traffic volume, the number of active terminals, and the resource usage rate in at least one of the communication control device 10 and the wireless communication device 20. .
- the cooperative control unit 144 When the FD mode is selected, the cooperative control unit 144 further includes capability information indicating whether one or more terminal devices 30 connected to the wireless communication device 20 can use the interference cancellation technique based on the received power difference. Based on the above, a terminal device candidate that receives an access link signal transmitted in the FD mode is selected. The candidate selected here is a terminal that can use the interference cancellation technique based on the received power difference. Then, the coordinated control unit 144 further receives, based on the channel state of the access link 23 and the channel state of the radio backhaul link 22, among the terminals that can use the interference cancellation technology based on the received power difference. An appropriate terminal device 30 that should receive the signal R1 (that is, should be subject to the FD mode) is selected.
- the cooperative control unit 144 may be able to easily generate the reception power difference described above with reference to FIG. 4 such as a large channel state difference between the radio backhaul link 22 and the access link 23.
- the terminal device 30 in the radio wave condition or the like is selected.
- FIG. 5 is a block diagram illustrating an example of a logical configuration of the wireless communication device 20 according to the present embodiment.
- the wireless communication device 20 includes a wireless communication unit 210, a self-interference processing unit 220, a storage unit 230, and a control unit 240.
- the wireless communication unit 210 establishes an access link 23 with one or more small cell terminals (slave devices) in the small cell 21 and communicates with the small cell terminal on the access link 23. .
- the wireless communication unit 210 establishes a wireless backhaul link 22 with the macrocell base station 10 and communicates with the macrocell base station 10 on the wireless backhaul link 22.
- the wireless communication unit 210 has at least four antennas, two of which are used for the access link 23 and the other two are used for the wireless backhaul link 22.
- One of the two antennas for the access link 23 is for downlink transmission and the other is for uplink reception.
- One of the two antennas for the wireless backhaul link 22 is for downlink reception and the other is for uplink transmission.
- the wireless communication unit 210 operates in either the above-described FD (full duplex) mode or non-FD mode.
- the radio communication unit 210 receives a downlink signal at the reception antenna for the radio backhaul link 22 and simultaneously transmits for the access link 23 on the same channel. Transmit downlink signal with antenna. Thereby, transmission on the wireless backhaul link 22 by the macrocell base station 10 and transmission on the access link 23 by the wireless communication apparatus 20 are simultaneously performed on the same channel.
- the radio communication unit 210 receives the uplink signal with the receiving antenna for the access link 23 and simultaneously transmits the uplink signal with the transmitting antenna for the radio backhaul link 22 on the same channel. Send. Thereby, the transmission on the access link 23 by the terminal device 30 and the transmission on the wireless backhaul link 22 by the wireless communication device 20 are simultaneously performed on the same channel.
- the wireless communication unit 210 performs time and transmission for reception and transmission (transmission and reception) on the wireless backhaul link 22 and the access link 23. Use different resources in one or both of the frequencies.
- the radio communication unit 210 includes one antenna for the access link 23 shared by downlink transmission and uplink reception, and the radio backhaul link 22 shared by downlink reception and uplink transmission. You may have one antenna for.
- the self-interference processing unit 220 removes, from the received signal, self-interference caused by the wraparound of the transmission signal when the wireless communication unit 210 performs wireless communication in the FD mode.
- the self-interference processing unit 220 can obtain, for example, a desired received signal from which self-interference is removed by subtracting the product of the channel response of the wraparound channel and the replica of the transmitted signal from the received signal. Note that the self-interference processing unit 220 may remove self-interference using any known SIC technique, and details of the processing are not described here.
- the self-interference processing unit 220 may apply the SIC technology to one of the two systems of the downlink and the uplink, or may apply the SIC technology to both.
- the storage unit 230 stores a program and data for the operation of the wireless communication device 20 using a storage medium such as a hard disk or a semiconductor memory.
- the data stored by the storage unit 230 may include, for example, master device information of the wireless communication device 20 and small cell information of the small cell 21 operated by the wireless communication device 20.
- the data stored in the storage unit 230 includes various control information signaled from the communication control device 10 (operation mode information, setting information indicating the magnitude relationship of received power in the terminal device 30, transmission power information, and the like). May be included.
- the control unit 240 controls wireless communication executed by the wireless communication unit 210.
- the control unit 240 also controls wireless communication executed by one or more small cell terminals connected to the small cell 21. For example, when an operation in the FD mode is instructed from the communication control device 10, the control unit 240 sets the operation mode of the wireless communication unit 210 to the FD mode. In addition, when an operation in the non-FD mode is instructed from the communication control device 10, the control unit 240 sets the operation mode of the wireless communication unit 210 to the non-FD mode.
- the control unit 240 performs wireless communication with the small cell terminal based on the control by the communication control device 10. For example, the control unit 240 controls the wireless communication unit 210 to transmit a message indicating the operation mode (FD mode or non-FD mode) of the wireless communication unit 210 to the terminal device 30. When the wireless communication unit 210 operates in the FD mode, the control unit 240 sets the power indicated by the transmission power information received from the communication control apparatus 10 as the transmission power of the transmission signal transmitted by the wireless communication unit 210. .
- the macro cell base station 10 and the radio communication device 20 set the power of the transmission signal according to the transmission power information determined by the communication control device 10, so that the reception power difference described above occurs in the terminal device 30.
- the control unit 240 controls the wireless communication unit 210 to transmit a message indicating the magnitude relationship of received power to the terminal device 30.
- the terminal device 30 can remove interference based on the received signal difference.
- the message indicating the magnitude relationship of the received power may be the same message as the message indicating the operation mode described above, or may be a different message.
- control unit 240 performs retransmission control in wireless communication with the terminal device 30. For example, the control unit 240 transmits next data or retransmits the same data in response to an ACK response or NACK response from the small cell terminal 30.
- FIG. 6 is a block diagram illustrating an example of a logical configuration of the terminal device 30 according to the present embodiment.
- the terminal device 30 includes a wireless communication unit 310, a signal processing unit 320, a storage unit 330, and a control unit 340.
- the radio communication unit 310 establishes the access link 23 with the radio communication device 20 that is the master device of the small cell 21 and communicates with the radio communication device 20 on the access link 23. As shown in FIG. 2, when the wireless communication device 20 operates in the FD mode, the wireless communication unit 310 receives the received signal on the access link 23 and the wireless backhaul link 22 from the macrocell base station 10 to the wireless communication device 20. A received signal resulting from the transmission above may be received. These received signals are received as composite signals by the wireless communication unit 310. As shown in FIG. 6, the wireless communication unit 310 has two antennas for the access link 23, one of which is for downlink reception and the other is for uplink transmission. However, the antenna configuration shown in FIG. 6 is merely an example. For example, the wireless communication unit 310 may have the same antenna configuration as the wireless communication unit 210 of the wireless communication device 20 illustrated in FIG. 5 and may be operable as a master device.
- the signal processing unit 320 transmits by the macrocell base station 10 on the radio backhaul link 22 that interferes with a reception signal on the access link 23 when the radio communication device 20 operates in the FD mode.
- the received signal resulting from the above is removed using an interference cancellation technique based on the received power difference.
- the signal processing unit 320 when the reception power of the interference signal is smaller than the reception power of the desired signal, the signal processing unit 320 generates an interference signal from the signal received by the wireless communication unit 310.
- a desired signal can be obtained by demodulating the received signal without removing it.
- the signal processing unit 320 removes the interference signal from the combined signal received by the wireless communication unit 310.
- the transmission power by the communication control device 10 and the wireless communication device 20 is controlled by the communication control device 10 so that the received power difference between the desired signal and the interference signal is equal to or greater than the threshold value.
- the magnitude relationship between the received power of the desired signal and the interference signal is known by the control unit 340 described later.
- the signal processing unit 320 first demodulates an interference signal whose received power is larger than a threshold value compared to the desired signal, and then remodulates the demodulated interference signal to remove the modulated signal from the combined signal and remove it.
- the desired signal can be demodulated from the later signal. For example, “Shi Cheng, and Ravi Narasimhan,“ Soft interference cancellation receiver for SC-FDMA uplink in LTE, ”WCNC, page 3318- 3322. IEEE, (2013) ”.
- the storage unit 330 stores a program and data for the operation of the terminal device 30 using a storage medium such as a hard disk or a semiconductor memory.
- the data stored in the storage unit 330 is, for example, capability information indicating that the terminal device 30 can use the interference cancellation technique based on the received power difference, and various signals signaled from the communication control device 10 or the wireless communication device 20.
- Control information (such as operation mode information and setting information indicating the magnitude relationship of received power).
- the control unit 340 controls wireless communication executed by the wireless communication unit 310.
- the control unit 340 connects the terminal device 30 to a cell selected through the cell selection procedure.
- the control unit 340 transmits the capability information stored in the storage unit 330 to the wireless communication device 20 that is the master device of the small cell 21 via the wireless communication unit 310. To do.
- This capability information is transmitted from the wireless communication device 20 to the communication control device 10.
- the communication control apparatus 10 recognizes that the terminal device 30 can receive the signal transmitted on an access link in FD mode based on this capability information.
- control unit 340 causes the radio communication unit 310 to transmit an uplink signal and receive a downlink signal according to the scheduling information received from the radio communication device 20.
- the control unit 340 sends a message indicating the control result by the communication control device 10 (message indicating the relationship between the operation mode and the received power) to the wireless communication unit 310. Receive via. Then, based on the received message, control unit 340 determines which of the received power of the desired signal and the interference signal is greater.
- the control unit 340 causes the signal processing unit 320 to remove the interference signal from the combined signal received by the wireless communication unit 310, and removes the interference signal.
- the desired signal is demodulated from the later signal.
- control unit 340 performs retransmission control in wireless communication with the wireless communication device 20. For example, the control unit 340 transmits an ACK response or a NACK response to the wireless communication device 20 based on whether or not the data has been successfully decoded from the signal received from the wireless communication device 20.
- the configuration example of the terminal device 30 has been described above. Next, with reference to FIG. 7, signal reception by the wireless communication unit 310 and interference removal by the signal processing unit 320 will be described while showing a flow of data transmission / reception of the entire communication control system 1.
- FIG. 7 is a diagram illustrating an example of the flow of data transmission / reception in the communication control system 1.
- transmission by the communication control device 10 is “eNodeB Tx”
- reception by the wireless communication device 20 is “Master Rx”
- transmission by the wireless communication device 20 is “Master Tx”
- reception by the terminal device 30 is “Slave Rx”.
- Each column in the figure corresponds to, for example, a time slot, and time flows from left to right.
- a signal carrying data D t1 transmitted to the wireless communication device 20 by the communication control device 10 is received as a desired signal by the wireless communication device 20, and as indicated by a dotted line in the figure. And received as an interference signal by the terminal device 30.
- the signal processing unit 320 discards the signal received by the wireless communication unit 310.
- the communication control device 10 transmits a signal carrying the data Dt2 to the wireless communication device 20.
- the wireless communication device 20 receives a signal carrying the data Dt2 , and simultaneously transmits a signal carrying the data Dt1 received from the communication control device 10 in the previous time slot.
- the terminal device 30 receives a composite signal composed of a signal carrying the data D t1 transmitted from the radio communication device 20 and a signal carrying the data D t2 transmitted from the communication control device 10.
- the terminal device 30 separates each signal based on the received power difference between the two signals to obtain the desired signal. Thereafter, at time t3, the same data transmission / reception as at time t2 is performed, and the terminal device 30 separates the signals based on the received power difference between the signals carrying the data Dt2 and Dt3 , respectively, and transmits the desired signal. To get.
- FIG. 8 is a sequence diagram illustrating an example of a flow of communication control processing executed in the communication control system 1 according to the present embodiment.
- the sequence shown in FIG. 8 involves a communication control apparatus 10 as a macro cell base station, a radio communication apparatus 20 that is a small cell master device, a small cell terminal 30, and a control entity 40.
- the control entity 40 may be included in the communication control apparatus 10 as the cooperative control unit 144 as illustrated in FIG. 3.
- the control entity 40 collects macro cell information from the communication control device 10, master device information from the wireless communication device 20, and slave device information from the small cell terminal 30. For example, the control entity 40 collects load information such as the traffic amount, the number of terminals, and the resource usage rate as information for determining whether the wireless communication device 20 should perform wireless communication in the FD mode. Further, the control entity 40 indicates whether the small cell terminal 30 can use the interference cancellation technique based on the received power difference as information for the wireless communication apparatus 20 to select the terminal apparatus 30 that is the target of the FD mode. Collect capability information.
- control entity 40 uses the channel states of the radio backhaul link 22 and the access link 23 as information for the radio communication device 20 to select a small cell terminal 30 that is a target of the FD mode and information for transmission power control.
- Collect information that indicates As an index indicating the channel state for example, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and the like can be considered.
- the collection of these information may be executed periodically, or may be triggered by an event such as the start of small cell operation or the movement of the wireless communication device 20 or the terminal device 30.
- step S104 the control entity 40 determines whether the wireless communication device 20 should perform wireless communication in the FD mode. For example, the control entity 40 determines that the wireless communication should be performed in the FD mode when the load information indicating at least one of the traffic volume, the number of terminals, and the resource usage rate indicates a load exceeding a threshold value. When the load below the threshold is indicated, it is determined that wireless communication should be executed in the non-FD mode.
- step S106 the control entity 40 sets the wireless communication device 20 and the small cell terminal to which the wireless communication device 20 is the target of the FD mode as the FD pair. Set as.
- step S108 the control entity 40 allows the small cell terminal 30 to remove interference using an interference cancellation technique based on the received power difference, that is, the communication control device 10 and the radio so that the received power difference becomes equal to or greater than the threshold.
- the transmission power of the communication device 20 is controlled.
- step S110 the control entity 40 notifies the communication control device 10, the wireless communication device 20, and the small cell terminal 30 of setting information indicating the control result in step S108.
- the setting information includes information indicating the operation mode of the wireless communication device 20, transmission power information of the communication control device 10 and the wireless communication device 20, and information indicating the magnitude relationship of the reception power in the small cell terminal.
- the communication control device 10 and the wireless communication device 20 determine the power value indicated by the transmission power information as the power value of the transmission signal.
- step S112 the communication control device 10 and the wireless communication device 20 modulate the transmission data to generate a transmission signal, and transmit the transmission signal with the transmission power determined in step S110.
- the interference signal from the communication control device 10 received by the small cell terminal 30 and the reception signal from the wireless communication device 20 have a received power difference equal to or greater than the threshold due to control by the control entity 40 in step S108. Yes.
- step S114 the small cell terminal 30 acquires the desired signal by removing the interference signal by the interference removal technique based on the received power difference.
- the processing executed here will be described in detail later.
- step S116 the wireless communication device 20 removes the self-interference caused by the sneak in the transmission signal from the reception signal using the SIC technique.
- step S118 the small cell terminal 30, the wireless communication device 20, and the communication control device 10 perform ACK / NACK processing.
- the control entity 40 performs retransmission determination according to the received ACK / NACK response.
- FIG. 9 is a flowchart illustrating an example of a detailed flow of FD pair setting and transmission power control illustrated in FIG.
- step S202 the control entity 40 determines whether or not one or more small cell terminals 30 connected to the wireless communication device 20 can use the interference cancellation technique based on the received power difference. Based on the capability information shown, a candidate for a small cell terminal that receives an access link signal transmitted in the FD mode is selected.
- step S204 the control entity 40 selects the small cell terminal 30 that the wireless communication device 20 is a target of wireless communication in the FD mode from the candidates selected in step S202.
- the control entity 40 is a small cell terminal that is in a positional relationship or a radio wave situation where a reception power difference can easily occur, such as a large channel state difference between the radio backhaul link 22 and the access link 23. Select 30.
- step S206 the control entity 40 sets the magnitude relationship of the received power between the desired signal received from the radio communication device 20 and the interference signal received from the communication control device 10 in the small cell terminal 30. Specifically, the control entity 40 compares the channel state of the radio backhaul link 22 and the channel state of the access link 23 to determine the magnitude relationship between the received power of the desired signal and the received power of the interference signal in the small cell terminal 30. Set.
- step S208 the control entity 40 determines the transmission power values of the communication control device 10 and the wireless communication device 20. Specifically, the control entity 40 determines the transmission power of the communication control device 10 and the transmission power value of the wireless communication device 20 based on the magnitude relationship set in step S206 and the channel states of the wireless backhaul link 22 and the access link 23. To decide. At this time, the control entity 40 allows each of the transmission powers so that the small cell terminal 30 can remove the interference by using an interference removal technique based on the received power difference, that is, the received power difference is equal to or greater than the threshold. Determine the value.
- FIG. 10 is a flowchart showing an example of a detailed flow of interference removal shown in FIG.
- step S302 the small cell terminal 30 determines which one of the desired signal, the received power, and the received signal of the interference signal is larger.
- the small cell terminal 30 determines which is larger by referring to the information indicating the magnitude relation of the received power included in the setting information notified from the control entity 40 (step S110 in FIG. 8).
- step S304 the small cell terminal 30 has a received power difference between the desired signal and the interference signal included in the received combined signal equal to or larger than the threshold value. Is used to demodulate the desired signal.
- step S306 the small cell terminal 30 determines that the received power difference between the desired signal and the interference signal included in the received combined signal is greater than or equal to the threshold value. Is used to demodulate the interference signal.
- step S308 the small cell terminal 30 modulates the interference signal demodulated in step S306, and removes the modulated interference signal from the received combined signal.
- step S310 the small cell terminal 30 demodulates the desired signal from the signal after the interference signal is removed in step S308.
- step S312 the small cell terminal 30 determines whether or not the received data has been decoded from the acquired desired signal, for example, by executing error detection.
- the small cell terminal 30 transmits an ACK response in step S314.
- step S316 the small cell terminal 30 stores the received data in a buffer.
- the received data stored in the buffer at this time can be used later when decoding the received data in step S312.
- step S318, the small cell terminal 30 transmits a NACK response.
- the macro cell base station or the master device may multiplex transmission of signals to a plurality of terminals using the above-described NOMA technology.
- the macro cell base station and the master device can simultaneously transmit a desired signal to the terminal device 30.
- the macro cell base station 10 performs transmission to other macro cell terminals on the same channel. Assume the case of executing simultaneously. In this case, in the small cell terminal 30, other signals transmitted from the macro cell base station 10 simultaneously on the same channel as the received signal from the master device 20 and the interference signal resulting from the transmission from the macro cell base station 10 to the master device 20 The signal addressed to the small cell terminal is received by the wireless communication unit 310 as an interference signal (third received signal).
- the signal processing unit 320 uses the interference cancellation technique based on the received power difference, and causes interference caused by transmission from the macro cell base station 10 to the master device 20 from the combined signal received by the wireless communication unit 310.
- the desired signal from the master device 20 can be acquired by removing the signal and further removing the interference signal addressed to another small cell terminal.
- the macro cell base station 10 directly transmits to the small cell terminal 30 in addition to transmission on the wireless backhaul link 22 and transmission on the access link 23 intended for the small cell terminal 30. Can be executed simultaneously on the same channel.
- the received signal from the macro cell base station 10 (simultaneously on the same channel as the received signal from the master device 20 and the interference signal resulting from the transmission from the macro cell base station 10 to the master device 20)
- the fourth received signal is received by the wireless communication unit 310. Therefore, the signal processing unit 320 separates the reception signal from the master device 20 and the reception signal from the macrocell base station 10 from the combined signal received by the wireless communication unit 310 based on the reception power difference between the signals. get.
- the two received signals may each include a packet carrying different data, or may contain a packet carrying the same data.
- the throughput data rate
- RV Redundancy Version
- the cooperative control function of the communication control apparatus 10 may be realized as any type of server such as a tower server, a rack server, or a blade server.
- the cooperative control function may be a control module (for example, an integrated circuit module configured by one die or a card or a blade inserted into a slot of the blade server) mounted on the server.
- the communication control apparatus 10 may be realized as any type of eNB (evolved Node B) such as a macro eNB or a small eNB.
- the small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB, or a home (femto) eNB.
- the communication control apparatus 10 may be realized as another type of base station such as Node B or BTS (Base Transceiver Station).
- the radio communication device 20 may also be realized as any type of eNB, or may be realized as another type of base station such as NodeB or BTS.
- the wireless communication device 20 and the terminal device 30 may be a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable / dongle type mobile router or a digital camera, or a car navigation system. You may implement
- the wireless communication device 20 and the terminal device 30 may be realized as terminals (also referred to as MTC (Machine Type Communication) terminals) that perform M2M (Machine To Machine) communication. Further, the wireless communication device 20 and the terminal device 30 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these terminals.
- FIG. 11 is a block diagram illustrating an example of a schematic configuration of the cooperative control server 700 to which the technology according to the present disclosure can be applied.
- the cooperative control server 700 includes a processor 701, a memory 702, a storage 703, a network interface 704, and a bus 706.
- the processor 701 may be, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), and controls various functions of the cooperative control server 700.
- the memory 702 includes a RAM (Random Access Memory) and a ROM (Read Only Memory), and stores programs and data executed by the processor 701.
- the storage 703 may include a storage medium such as a semiconductor memory or a hard disk.
- the network interface 704 is a wired communication interface for connecting the cooperative control server 700 to the wired communication network 705.
- the wired communication network 705 may be a core network such as EPC (Evolved Packet Core) or a PDN (Packet Data Network) such as the Internet.
- EPC Evolved Packet Core
- PDN Packet Data Network
- the bus 706 connects the processor 701, the memory 702, the storage 703, and the network interface 704 to each other.
- the bus 706 may include two or more buses with different speeds (eg, a high speed bus and a low speed bus).
- the cooperative control unit 144 described with reference to FIG. 3 may be implemented in the processor 701.
- the cooperative control server 700 can use the interference cancellation technique based on the received power difference in the slave device by controlling the operation mode of the master device of the small cell and the transmission power of the macro cell base station and the master device. Become.
- FIG. 12 is a block diagram illustrating an example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied.
- the eNB 800 includes one or more antennas 810 and a base station device 820. Each antenna 810 and the base station apparatus 820 can be connected to each other via an RF cable.
- Each of the antennas 810 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission and reception of radio signals by the base station apparatus 820.
- the eNB 800 includes a plurality of antennas 810 as illustrated in FIG. 12, and the plurality of antennas 810 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. 12 shows an example in which the eNB 800 includes a plurality of antennas 810, the eNB 800 may include a single antenna 810.
- the base station apparatus 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
- the controller 821 may be a CPU or a DSP, for example, and operates various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors, and may transfer the generated bundled packet. In addition, the controller 821 is a logic that executes control such as radio resource control, radio bearer control, mobility management, inflow control, or scheduling. May have a typical function. Moreover, the said control may be performed in cooperation with a surrounding eNB or a core network node.
- the memory 822 includes RAM and ROM, and stores programs executed by the controller 821 and various control data (for example, terminal list, transmission power data, scheduling data, and the like).
- the network interface 823 is a communication interface for connecting the base station device 820 to the core network 824.
- the controller 821 may communicate with the core network node or other eNB via the network interface 823.
- the eNB 800 and the core network node or another eNB may be connected to each other by a logical interface (for example, an S1 interface or an X2 interface).
- the network interface 823 may be a wired communication interface or a wireless communication interface for wireless backhaul.
- the network interface 823 may use a frequency band higher than the frequency band used by the wireless communication interface 825 for wireless communication.
- the wireless communication interface 825 supports any cellular communication scheme such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to terminals located in the cell of the eNB 800 via the antenna 810.
- the wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like.
- the BB processor 826 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP).
- Various signal processing of Packet Data Convergence Protocol
- Packet Data Convergence Protocol is executed.
- the BB processor 826 may have some or all of the logical functions described above instead of the controller 821.
- the BB processor 826 may be a module that includes a memory that stores a communication control program, a processor that executes the program, and related circuits. The function of the BB processor 826 may be changed by updating the program. Good.
- the module may be a card or a blade inserted into a slot of the base station apparatus 820, or a chip mounted on the card or the blade.
- the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a radio signal via the antenna 810.
- the radio communication interface 825 includes a plurality of BB processors 826 as illustrated in FIG. 12, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 12, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements, respectively. 12 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. But you can.
- the cooperative control unit 144 described with reference to FIG. 3 may be implemented in the controller 821.
- the eNB 800 controls the operation mode of the master device of the small cell and the transmission power of the eNB 800 and the master device, it is possible to use the interference cancellation technique based on the received power difference in the slave device.
- FIG. 13 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied.
- the smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more antenna switches 915.
- One or more antennas 916, a bus 917, a battery 918 and an auxiliary controller 919 are provided.
- the processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900.
- the memory 902 includes a RAM and a ROM, and stores programs executed by the processor 901 and data.
- the storage 903 can include a storage medium such as a semiconductor memory or a hard disk.
- the external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
- the camera 906 includes, for example, an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image.
- the sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
- the microphone 908 converts sound input to the smartphone 900 into an audio signal.
- the input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button, or a switch, and receives an operation or information input from a user.
- the display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900.
- the speaker 911 converts an audio signal output from the smartphone 900 into audio.
- the wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication.
- the wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like.
- the BB processor 913 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for wireless communication.
- the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 916.
- the wireless communication interface 912 may be a one-chip module in which the BB processor 913 and the RF circuit 914 are integrated.
- the wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as illustrated in FIG. Although FIG. 13 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. But you can.
- the wireless communication interface 912 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a wireless LAN (Local Area Network) method in addition to the cellular communication method.
- a BB processor 913 and an RF circuit 914 for each wireless communication method may be included.
- Each of the antenna switches 915 switches the connection destination of the antenna 916 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 912.
- Each of the antennas 916 includes a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of a radio signal by the radio communication interface 912.
- the smartphone 900 may include a plurality of antennas 916 as illustrated in FIG. Note that although FIG. 13 illustrates an example in which the smartphone 900 includes a plurality of antennas 916, the smartphone 900 may include a single antenna 916.
- the smartphone 900 may include an antenna 916 for each wireless communication method.
- the antenna switch 915 may be omitted from the configuration of the smartphone 900.
- the bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other.
- the battery 918 supplies electric power to each block of the smartphone 900 shown in FIG. 13 through a power supply line partially shown by a broken line in the drawing.
- the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.
- the smartphone 900 can operate as a small cell master device.
- the smartphone 900 may have the function of the wireless communication device 20 described with reference to FIG.
- the smartphone 900 allows the slave device to use the interference cancellation technology based on the received power difference while more efficiently using the radio resource by the radio communication in the FD mode.
- the smartphone 900 can operate as a small cell slave device.
- the smartphone 900 may have the function of the terminal device 30 described with reference to FIG. Thereby, the smartphone 900 can acquire the desired signal by removing the interference from the received signal using the interference removal technology based on the received power difference.
- FIG. 14 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied.
- the car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication.
- the interface 933 includes one or more antenna switches 936, one or more antennas 937, and a battery 938.
- the processor 921 may be a CPU or SoC, for example, and controls the navigation function and other functions of the car navigation device 920.
- the memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.
- the GPS module 924 measures the position (for example, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites.
- the sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor.
- the data interface 926 is connected to the in-vehicle network 941 through a terminal (not shown), for example, and acquires data generated on the vehicle side such as vehicle speed data.
- the content player 927 reproduces content stored in a storage medium (for example, CD or DVD) inserted into the storage medium interface 928.
- the input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and receives an operation or information input from the user.
- the display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of content to be reproduced.
- the speaker 931 outputs the navigation function or the audio of the content to be played back.
- the wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication.
- the wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like.
- the BB processor 934 may perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for wireless communication.
- the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a radio signal via the antenna 937.
- the wireless communication interface 933 may be a one-chip module in which the BB processor 934 and the RF circuit 935 are integrated.
- the wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935 as shown in FIG. 14 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. But you can.
- the wireless communication interface 933 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a wireless LAN method in addition to the cellular communication method.
- a BB processor 934 and an RF circuit 935 may be included for each communication method.
- Each of the antenna switches 936 switches the connection destination of the antenna 937 among a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication systems).
- Each of the antennas 937 has a single or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission / reception of a radio signal by the radio communication interface 933.
- the car navigation device 920 may include a plurality of antennas 937 as shown in FIG. 14 illustrates an example in which the car navigation apparatus 920 includes a plurality of antennas 937, the car navigation apparatus 920 may include a single antenna 937.
- the car navigation device 920 may include an antenna 937 for each wireless communication method.
- the antenna switch 936 may be omitted from the configuration of the car navigation device 920.
- the battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 14 through a power supply line partially shown by a broken line in the drawing. Further, the battery 938 stores electric power supplied from the vehicle side.
- the car navigation device 920 can operate as a master device of a small cell.
- the car navigation device 920 may have the function of the wireless communication device 20 described with reference to FIG.
- the car navigation apparatus 920 makes it possible to use the interference cancellation technology based on the received power difference in the slave device while more efficiently using the radio resource by the radio communication in the FD mode.
- the car navigation apparatus 920 can operate as a slave device of a small cell.
- the car navigation device 920 may have the function of the terminal device 30 described with reference to FIG. Accordingly, the car navigation apparatus 920 can acquire the desired signal by removing the interference from the received signal using the interference removal technique based on the received power difference.
- the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942.
- vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.
- communication in full-duplex (FD) mode is performed in a master device that is connected to a base station via a wireless backhaul link and connected to one or more terminals via an access link. Done. Then, the transmission power of the base station and the master device is controlled so that interference can be removed by using an interference removal technique based on the received power difference in the slave device. Thereby, the slave device can remove the interference signal resulting from the transmission from the base station to the master device based on the received power difference, and obtain the desired signal from the master device.
- FD full-duplex
- the FD mode can be used to efficiently use radio resources, and the system capacity can be increased. For example, the latency for relaying traffic is shortened. In addition, since the memory size required for the small cell master device to buffer traffic is small, the introduction cost of the device can be reduced.
- the communication control apparatus 10 transmits a message indicating which of the received power of the desired signal and the received power of the interference signal is larger to the slave device via the master device.
- the slave device can know which of the received power of the desired signal and the received power of the interference signal is larger, and thus can acquire the desired signal from the received combined signal.
- the slave device can demodulate the desired signal using the fact that the received power difference is equal to or greater than the threshold value.
- the slave device removes the interference signal from the received composite signal using the fact that the received power difference is greater than or equal to the threshold, The desired signal can be demodulated.
- the communication control apparatus 10 performs communication in the FD mode by the master device based on capability information indicating that the slave device can use the interference cancellation technology based on the received power difference. Select the slave device to be targeted. Further, the communication control apparatus 10 selects a slave device to be a target of communication in the FD mode by the master device, based further on the channel state of the access link and the channel state of the wireless backhaul link. Thereby, the communication control apparatus 10 can utilize a radio
- the communication control apparatus 10 compares the channel state of the radio backhaul link and the channel state of the access link, thereby determining which of the reception power of the desired signal and the reception power of the interference signal. Determine whether it should be set larger.
- the communication control apparatus 10 can use radio resources more efficiently by setting the magnitude relationship of the received power so that the received power difference can be more easily provided using the comparison result of each channel state. it can.
- 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.
- the program constituting the software is stored in advance in a storage medium (non-transitory 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.
- the wireless communication device Which of the received power of the first received signal and the received power of the second received signal is greater based on a message indicating a control result by a control entity that controls the transmission power of the base station and the master terminal
- the control unit transmits capability information indicating that the radio communication device can use the interference cancellation technology based on a received power difference to the master terminal via the radio communication unit, The capability information is used by the control entity to determine whether transmission on the radio backhaul link and the access link is to be performed by the master terminal simultaneously on the same channel;
- the wireless communication device according to (3) or (4).
- the signal processing unit is configured such that a third received signal addressed to another device that interferes with the first received signal is simultaneously transmitted on the wireless communication unit on the same channel as the first received signal and the second received signal. 6.
- the wireless communication device according to any one of (1) to (5), wherein when receiving the signal, the third received signal is further removed using the interference cancellation technique based on a received power difference.
- the signal processing unit receives a signal when the wireless communication unit receives a fourth reception signal addressed to the wireless communication device simultaneously on the same channel as the first reception signal and the second reception signal. Any one of (1) to (6), wherein the first received signal and the fourth received signal are acquired from a combined signal received by the wireless communication unit based on a received power difference between A wireless communication device according to 1. (8) When transmission from the base station to the master terminal on the radio backhaul link and transmission from the master terminal to the radio communication device on the access link are performed simultaneously on the same channel, the first on the access link So that the wireless communication apparatus can remove a second received signal caused by transmission on the wireless backhaul link using an interference cancellation technique based on a received power difference.
- a control unit for controlling the transmission power of the base station and the transmission power of the master terminal comprising: (9) The control unit includes the base station and the master terminal such that a power difference between the received power of the first received signal and the received power of the second received signal is greater than or equal to a threshold in the wireless communication device.
- the communication control apparatus according to (8), wherein the transmission power is controlled.
- the control unit compares the channel state of the wireless backhaul link with the channel state of the access link, thereby determining which of the received power of the first received signal and the received power of the second received signal is greater.
- the communication control device according to (9), wherein it is determined whether to set a large value.
- the communication control apparatus includes a distance between nodes at both ends of each link or a path loss, or a channel quality of each link.
- the control unit causes the master terminal to transmit a message indicating which of the received power of the first received signal and the received power of the second received signal is greater from the master terminal to the radio communication device (8
- the communication control device according to any one of (1) to (11).
- the control unit receives the first received signal based on capability information indicating whether or not one or more terminals connected to the master terminal can use the interference cancellation technique based on a received power difference.
- the communication control device according to any one of (8) to (12), wherein the wireless communication device to be selected is selected from the one or more terminals.
- the control unit is configured to determine the one wireless communication device to receive the first reception signal based on a channel state of an access link of the one or more terminals and a channel state of the wireless backhaul link.
- the communication control apparatus according to (13), which is selected from the above terminals.
- the control unit performs transmission on the radio backhaul link and the access link on the same channel.
- the communication control device according to any one of (8) to (14), wherein the communication control device is executed simultaneously.
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Abstract
Description
なお、上記の効果は必ずしも限定的なものではなく、上記の効果とともに、または上記の効果に代えて、本明細書に示されたいずれかの効果、または本明細書から把握され得る他の効果が奏されてもよい。
1.システムの概要
1-1.スモールセルの導入
1-2.全二重(FD)モードの採用
2.通信制御装置の構成例
3.無線通信装置の構成例
4.端末装置の構成例
5.動作処理
5-1.システム全体の動作
5-2.制御エンティティによるFDペアの設定及び送信電力制御
5-3.スモールセル端末による干渉除去
6.補足
7.応用例
7-1.協調制御ノードに関する応用例
7-2.基地局に関する応用例
7-3.端末装置に関する応用例
8.まとめ
[1-1.スモールセルの導入]
図1は、本開示に係る技術の一実施形態に係る通信制御システム1の概要について説明するための説明図である。通信制御システム1は、通信制御装置10、並びに無線通信装置20a及び20bを含む。
無線通信装置20は、スモールセル21内の端末装置を宛て先とするダウンリンクトラフィックを無線バックホールリンク22を介して受信し、受信したトラフィックを宛て先の端末装置へアクセスリンク23を介して送信する。また、無線通信装置20は、スモールセル21内の端末装置から受信されるアップリンクトラフィックをアクセスリンク23を介して受信し、受信したトラフィックを無線バックホールリンク22を介して送信する。無線バックホールリンク22上での受信及びアクセスリンク23上での送信、又はアクセスリンク23上での受信及び無線バックホールリンク22上での送信が時分割方式で実行される場合、無線通信装置20において受信信号と送信信号とが互いに干渉することは無い。しかし、こうした時分割方式での運用は、トラフィックの中継のためのレイテンシを増大させる。マスタデバイスにおいてトラフィックをバッファリングするために要するメモリサイズも多大となる。また、無線バックホールリンク及びアクセスリンクに異なる周波数チャネルを割当てることによっても、上述した受信信号と送信信号との干渉を回避することができる。しかし、こうした周波数分割方式での運用は、利用可能な周波数リソースが十分に存在する状況においてのみ採用され得る。いずれの方式でも、無線リソースの利用効率が最適化されるとは言い難い。そこで、本実施形態では、無線リソースをより効率的に利用するために、全二重(FD)モードが導入される。
図3は、本実施形態に係る通信制御装置10の論理的な構成の一例を示すブロック図である。図3を参照すると、通信制御装置10は、無線通信部110、ネットワーク通信部120、記憶部130及び制御部140を備える。
無線通信部110は、マクロセル11に接続する端末装置(以下、マクロセル端末という)との間で無線通信を実行する。例えば、無線通信部110は、マクロセル端末からアップリンクトラフィックを受信し、及びマクロセル端末へダウンリンクトラフィックを送信する。また、無線通信部110は、ダウンリンクにおいて同期信号及びリファレンス信号をブロードキャストする。同期信号は、マクロセル端末がマクロセル11との同期を獲得するために使用される。無線通信装置20もまた、当該同期信号を探索することにより、マクロセル11との同期を獲得し得る。リファレンス信号は、通信品質の測定のために使用される。リファレンス信号を用いて測定される通信品質は、例えば、マクロセル間、又はマクロセルとスモールセルとの間のハンドオーバをトリガするハンドオーバ判定のための指標となる。
ネットワーク通信部120は、通信制御装置10をコアネットワーク15に接続するための通信インタフェースである。ネットワーク通信部120は、有線通信インタフェースであってもよく、又は無線通信インタフェースであってもよい。ネットワーク通信部120は、コアネットワーク15内の様々な制御ノードとの間で、データトラフィックを送受信し、及び制御メッセージを交換する。
記憶部130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、通信制御装置10の動作のためのプログラム及びデータを記憶する。記憶部130により記憶されるデータは、例えば、マクロセル情報(マクロセル基地局の位置、セル半径、アンテナ構成及び運用周波数帯など)、無線通信装置20から収集されるマスタデバイス情報(デバイスID、デバイスタイプ、及び位置など)及びスモールセル情報(セル半径及びスモールセル端末数など)、スレーブデバイス情報(後述するケイパビリティ情報など)、並びに様々な制御パラメータ(後述する送信電力情報など)を含み得る。
制御部140は、通信制御装置10の動作全般を制御する。本実施形態において、制御部140は、マクロセル制御部142及び協調制御部144を含む。
マクロセル制御部142は、無線通信部110によるマクロセル端末との間の無線通信を制御する。マクロセル制御部142は、例えば、マクロセル11の運用周波数帯及びアンテナ構成などのシステム情報を生成し、生成したシステム情報を無線通信部110にブロードキャストさせる。また、マクロセル制御部142は、各マクロセル端末について、無線リソースの割当て、送信電力制御及び再送制御などを実行する。また、マクロセル制御部142は、後述の協調制御部144により決定された送信電力情報により示される電力を、無線通信部110により送信される送信信号の送信電力として決定する。マクロセル制御部142は、無線通信部110から入力されるアップリンクトラフィックをネットワーク通信部120へ転送する。また、マクロセル制御部142は、ネットワーク通信部120から入力されるダウンリンクトラフィックを無線通信部110へ転送する。
協調制御部144は、1つ以上のスモールセル21を活用した効率的な無線通信を促進するために、通信制御装置10及び無線通信装置20による無線バックホールリンク及びアクセスリンクの利用を制御する制御エンティティである。例えば、協調制御部144は、無線通信装置20がFDモードで無線通信を実行すべきかを判定する。そして、協調制御部144は、FDモードで無線通信を実行すべきであると判定すると、無線通信装置20にFDモードでの動作を指示する。一方、協調制御部144は、無線通信装置20がFDモードで無線通信を実行すべきでないと判定すると、無線通信装置20に非FDモードでの動作を指示する。
図5は、本実施形態に係る無線通信装置20の論理的な構成の一例を示すブロック図である。図5を参照すると、無線通信装置20は、無線通信部210、自己干渉処理部220、記憶部230及び制御部240を含む。
無線通信部210は、スモールセル21内の1つ以上のスモールセル端末(スレーブデバイス)との間でアクセスリンク23を確立し、アクセスリンク23上でスモールセル端末と通信する。また、無線通信部210は、マクロセル基地局10との間で無線バックホールリンク22を確立し、無線バックホールリンク22上でマクロセル基地局10と通信する。図5に示したように、無線通信部210は、少なくとも4本のアンテナを有し、そのうち2本はアクセスリンク23のために、他の2本は無線バックホールリンク22のために使用される。アクセスリンク23のための2本のアンテナのうちの1つはダウンリンク送信用であり、他の1つはアップリンク受信用である。無線バックホールリンク22のための2本のアンテナのうちの1つはダウンリンク受信用であり、他の1つはアップリンク送信用である。
自己干渉処理部220は、無線通信部210においてFDモードでの無線通信が実行される場合に、送信信号の回り込みに起因する自己干渉を受信信号から除去する。自己干渉処理部220は、例えば、回り込みチャネルのチャネル応答と送信信号のレプリカとの積を受信信号から減算し、自己干渉の除去された所望の受信信号を取得し得る。なお、自己干渉処理部220は任意の公知のSIC技術を利用して自己干渉を除去してよく、ここではその処理の詳細は説明されない。自己干渉処理部220は、ダウンリンク及びアップリンクの2つの系統のうちの一方にSIC技術を適用してもよく、又は双方にSIC技術を適用してもよい。
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、無線通信装置20の動作のためのプログラム及びデータを記憶する。記憶部230により記憶されるデータは、例えば、無線通信装置20のマスタデバイス情報、及び無線通信装置20が運用するスモールセル21のスモールセル情報を含み得る。また、記憶部230により記憶されるデータは、通信制御装置10からシグナリングされる様々な制御情報(動作モード情報、端末装置30における受信電力の大小関係を示す設定情報、及び送信電力情報など)を含み得る。
制御部240は、無線通信部210により実行される無線通信を制御する。また、制御部240は、スモールセル21に接続する1つ以上のスモールセル端末により実行される無線通信をも制御する。制御部240は、例えば、通信制御装置10からFDモードでの動作が指示されると、無線通信部210の動作モードをFDモードに設定する。また、制御部240は、通信制御装置10から非FDモードでの動作が指示されると、無線通信部210の動作モードを非FDモードに設定する。
図6は、本実施形態に係る端末装置30の論理的な構成の一例を示すブロック図である。図6を参照すると、端末装置30は、無線通信部310、信号処理部320、記憶部330及び制御部340を含む。
無線通信部310は、スモールセル21のマスタデバイスである無線通信装置20との間でアクセスリンク23を確立し、アクセスリンク23上で無線通信装置20と通信する。図2に示したように、無線通信装置20がFDモードで動作する場合、無線通信部310は、アクセスリンク23上の受信信号とマクロセル基地局10から無線通信装置20への無線バックホールリンク22上での送信に起因する受信信号とを受信し得る。これら受信信号は、無線通信部310により、合成信号として受信される。図6に示すように、無線通信部310は、アクセスリンク23のための2本のアンテナを有し、そのうち1つはダウンリンク受信用であり、他の1つはアップリンク送信用である。ただし、図6に示したアンテナ構成は一例に過ぎない。例えば、無線通信部310は、図5に示した無線通信装置20の無線通信部210と同様のアンテナ構成を有していてもよく、マスタデバイスとして動作可能であってもよい。
信号処理部320は、無線通信装置20がFDモードで動作する場合、アクセスリンク23上での受信信号に干渉する、無線バックホールリンク22上でのマクロセル基地局10による送信に起因する受信信号を、受信電力差に基づく干渉除去技術を用いて除去する。図4を参照して上記説明したように、信号処理部320は、所望信号の受信電力よりも干渉信号の受信信号の受信電力が小さい場合、無線通信部310により受信される信号から干渉信号を除去することなく、受信信号を復調することにより所望信号を取得することができる。一方で、信号処理部320は、所望信号の受信電力よりも干渉信号の受信電力が大きい場合、無線通信部310により受信される合成信号から干渉信号を除去する。上述したように、通信制御装置10及び無線通信装置20による送信電力は、所望信号と干渉信号との間の受信電力差が閾値以上となるよう通信制御装置10により制御されている。また、後述の制御部340により、所望信号及び干渉信号の受信電力の大小関係が既知となる。このため、信号処理部320は、所望信号と比較して閾値以上に受信電力が大きい干渉信号をまず復調した後、復調した干渉信号を再度変調して当該変調信号を合成信号から除去し、除去後の信号から所望信号を復調することができる。このような干渉除去のための信号処理部320の具体的な回路の構成は、例えば、「Shi Cheng, and Ravi Narasimhan, "Soft interference cancellation receiver for SC-FDMA uplink in LTE," WCNC, page 3318-3322. IEEE, (2013)」に記載されている。
記憶部330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、端末装置30の動作のためのプログラム及びデータを記憶する。記憶部330により記憶されるデータは、例えば、端末装置30が受信電力差に基づく干渉除去技術を使用可能であることを示すケイパビリティ情報、及び通信制御装置10または無線通信装置20からシグナリングされる様々な制御情報(動作モード情報、及び受信電力の大小関係を示す設定情報など)を含み得る。
制御部340は、無線通信部310により実行される無線通信を制御する。例えば、制御部340は、セル選択手続を通じて選択されるセルに、端末装置30を接続させる。端末装置30がスモールセル21に接続した場合、制御部340は、記憶部330により記憶されているケイパビリティ情報を、無線通信部310を介してスモールセル21のマスタデバイスである無線通信装置20へ送信する。このケイパビリティ情報は、無線通信装置20から通信制御装置10へ送信される。そして、通信制御装置10は、このケイパビリティ情報に基づいて、端末装置30がFDモードにおいてアクセスリンク上で送信される信号を受信できることを認識する。
[5-1.システム全体の動作]
図8は、本実施形態に係る通信制御システム1において実行される通信制御処理の流れの一例を示すシーケンス図である。図8に示したシーケンスには、マクロセル基地局としての通信制御装置10、スモールセルのマスタデバイスである無線通信装置20、スモールセル端末30、及び制御エンティティ40が関与する。なお、制御エンティティ40は、図3に示したように協調制御部144として通信制御装置10に含まれていてもよい。
図9は、図8に示したFDペアの設定及び送信電力制御の詳細な流れの一例を示すフローチャートである。
図10は、図8に示した干渉除去の詳細な流れの一例を示すフローチャートである。
ここまで、主にスモールセルのマスタデバイスである無線通信装置20とスレーブデバイスである端末装置30との間の1対1の関係における干渉の除去について説明した。これに加えて、マクロセル基地局又はマスタデバイスは、上述したNOMA技術を用いて、複数の端末への信号の送信を多重化してもよい。また、端末装置30の受信電力差に基づく干渉除去技術のケイパビリティを応用し、マクロセル基地局及びマスタデバイスは端末装置30へ同時に所望信号を送信することも可能である。
本開示に係る技術は、様々な製品へ応用可能である。例えば、通信制御装置10の協調制御機能は、タワーサーバ、ラックサーバ、又はブレードサーバなどのいずれかの種類のサーバとして実現されてもよい。また、協調制御機能は、サーバに搭載される制御モジュール(例えば、1つのダイで構成される集積回路モジュール、又はブレードサーバのスロットに挿入されるカード若しくはブレード)であってもよい。
図11は、本開示に係る技術が適用され得る協調制御サーバ700の概略的な構成の一例を示すブロック図である。協調制御サーバ700は、プロセッサ701、メモリ702、ストレージ703、ネットワークインタフェース704及びバス706を備える。
図12は、本開示に係る技術が適用され得るeNBの概略的な構成の一例を示すブロック図である。eNB800は、1つ以上のアンテナ810、及び基地局装置820を有する。各アンテナ810及び基地局装置820は、RFケーブルを介して互いに接続され得る。
(第1の応用例)
図13は、本開示に係る技術が適用され得るスマートフォン900の概略的な構成の一例を示すブロック図である。スマートフォン900は、プロセッサ901、メモリ902、ストレージ903、外部接続インタフェース904、カメラ906、センサ907、マイクロフォン908、入力デバイス909、表示デバイス910、スピーカ911、無線通信インタフェース912、1つ以上のアンテナスイッチ915、1つ以上のアンテナ916、バス917、バッテリー918及び補助コントローラ919を備える。
図14は、本開示に係る技術が適用され得るカーナビゲーション装置920の概略的な構成の一例を示すブロック図である。カーナビゲーション装置920は、プロセッサ921、メモリ922、GPS(Global Positioning System)モジュール924、センサ925、データインタフェース926、コンテンツプレーヤ927、記憶媒体インタフェース928、入力デバイス929、表示デバイス930、スピーカ931、無線通信インタフェース933、1つ以上のアンテナスイッチ936、1つ以上のアンテナ937及びバッテリー938を備える。
ここまで、図1~図14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、無線バックホールリンクを介して基地局と接続し、及びアクセスリンクを介して1つ以上の端末と接続するマスタデバイスにおいて、全二重(FD)モードでの通信が行われる。そして、スレーブデバイスにおいて受信電力差に基づく干渉除去技術を用いて干渉を除去することが可能となるように、基地局及びマスタデバイスの送信電力が制御される。それにより、スレーブデバイスは、受信電力差に基づいて基地局からマスタデバイスへの送信に起因する干渉信号を除去して、マスタデバイスからの所望信号を取得することができる。従って、スモールセルが運用される環境において、FDモードを活用して無線リソースの効率的な利用を実現し、システムキャパシティを高めることができる。例えば、トラフィックの中継のためのレイテンシは、短縮される。また、スモールセルのマスタデバイスがトラフィックをバッファリングするために要するメモリサイズも小さくて済むため、デバイスの導入コストが削減され得る。
(1)
基地局と無線バックホールリンクを介して接続するマスタ端末との間でアクセスリンクを介して通信する無線通信部と、
前記無線バックホールリンク上での送信及び前記アクセスリンク上での送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上での送信に起因する第2の受信信号を、受信電力差に基づく干渉除去技術を用いて除去する信号処理部と、
を備える無線通信装置。
(2)
前記信号処理部は、前記第1の受信信号の受信電力よりも前記第2の受信信号の受信電力がより大きい場合に、前記無線通信部により受信される合成信号から前記第2の受信信号を除去する、前記(1)に記載の無線通信装置。
(3)
前記無線通信装置は、
前記基地局及び前記マスタ端末の送信電力を制御する制御エンティティによる制御結果を示すメッセージに基づいて、前記第1の受信信号の受信電力及び前記第2の受信信号の受信電力のいずれがより大きいかを判定する制御部、
をさらに備える、前記(2)に記載の無線通信装置。
(4)
前記基地局及び前記マスタ端末の送信電力は、前記第1の受信信号の受信電力と前記第2の受信信号の受信電力との間の電力差が閾値以上となるように、前記制御エンティティにより制御される、前記(3)に記載の無線通信装置。
(5)
前記制御部は、前記無線通信装置が受信電力差に基づく前記干渉除去技術を使用可能であることを示すケイパビリティ情報を前記無線通信部を介して前記マスタ端末へ送信し、
前記ケイパビリティ情報は、前記無線バックホールリンク及び前記アクセスリンク上での送信を同一チャネル上で同時に前記マスタ端末に実行させるかを判定するために前記制御エンティティにより使用される、
前記(3)又は前記(4)に記載の無線通信装置。
(6)
前記信号処理部は、前記第1の受信信号及び前記第2の受信信号と同一チャネル上で同時に、前記第1の受信信号に干渉する他の装置宛ての第3の受信信号が前記無線通信部により受信される場合に、受信電力差に基づく前記干渉除去技術を用いて前記第3の受信信号をさらに除去する、前記(1)~(5)のいずれか1項に記載の無線通信装置。
(7)
前記信号処理部は、前記第1の受信信号及び前記第2の受信信号と同一チャネル上で同時に、前記無線通信装置宛ての第4の受信信号が前記無線通信部により受信される場合に、信号間の受信電力差に基づいて、前記無線通信部により受信される合成信号から前記第1の受信信号及び前記第4の受信信号を取得する、前記(1)~(6)のいずれか1項に記載の無線通信装置。
(8)
無線バックホールリンク上での基地局からマスタ端末への送信及びアクセスリンク上での前記マスタ端末から無線通信装置への送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上の送信に起因する第2の受信信号を前記無線通信装置が受信電力差に基づく干渉除去技術を用いて除去することが可能となるように、前記基地局の送信電力及び前記マスタ端末の送信電力を制御する制御部、
を備える通信制御装置。
(9)
前記制御部は、前記無線通信装置において前記第1の受信信号の受信電力と前記第2の受信信号の受信電力との間の電力差が閾値以上となるように、前記基地局及び前記マスタ端末の送信電力を制御する、前記(8)に記載の通信制御装置。
(10)
前記制御部は、前記無線バックホールリンクのチャネル状態と前記アクセスリンクのチャネル状態とを比較することにより、前記第1の受信信号の受信電力及び前記第2の受信信号の受信電力のいずれをより大きく設定すべきかを判定する、前記(9)に記載の通信制御装置。
(11)
前記チャネル状態は、各リンクの両端のノード間の距離若しくは経路損失、又は各リンクのチャネル品質を含む、前記(10)に記載の通信制御装置。
(12)
前記制御部は、前記第1の受信信号の受信電力及び前記第2の受信信号の受信電力のいずれがより大きいかを示すメッセージを、前記マスタ端末から前記無線通信装置へ送信させる、前記(8)~(11)のいずれか1項に記載の通信制御装置。
(13)
前記制御部は、前記マスタ端末と接続する1つ以上の端末がそれぞれ受信電力差に基づく前記干渉除去技術を使用可能であるかを示すケイパビリティ情報に基づいて、前記第1の受信信号を受信すべき前記無線通信装置を前記1つ以上の端末から選択する、前記(8)~(12)のいずれか1項に記載の通信制御装置。
(14)
前記制御部は、前記1つ以上の端末のアクセスリンクのチャネル状態と前記無線バックホールリンクのチャネル状態とにさらに基づいて、前記第1の受信信号を受信すべき前記無線通信装置を前記1つ以上の端末から選択する、前記(13)に記載の通信制御装置。
(15)
前記制御部は、トラフィック量、端末数及びリソース使用率のうち少なくとも1つを示す負荷情報が閾値を上回る負荷を示す場合に、前記無線バックホールリンク及び前記アクセスリンク上での送信を同一チャネル上で同時に実行させる、前記(8)~(14)のいずれか1項に記載の通信制御装置。
(16)
基地局と無線バックホールリンクを介して接続するマスタ端末との間でアクセスリンクを介して通信する無線通信装置において、
前記無線バックホールリンク上での送信及び前記アクセスリンク上での送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上での送信に起因する第2の受信信号を、受信電力差に基づく干渉除去技術を用いて除去すること、
を含む、無線通信方法。
(17)
無線バックホールリンク上での基地局からマスタ端末への送信及びアクセスリンク上での前記マスタ端末から無線通信装置への送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上の送信に起因する第2の受信信号を前記無線通信装置が受信電力差に基づく干渉除去技術を用いて除去することが可能となるように、前記基地局の送信電力及び前記マスタ端末の送信電力を通信制御装置により制御すること、
を含む、通信制御方法。
110 無線通信部
120 ネットワーク通信部
130 記憶部
140 制御部
142 マクロセル制御部
144 協調制御部
20 無線通信装置
210 無線通信部
220 自己干渉処理部
230 記憶部
240 制御部
30 端末装置
310 無線通信部
320 信号処理部
330 記憶部
340 制御部
Claims (17)
- 基地局と無線バックホールリンクを介して接続するマスタ端末との間でアクセスリンクを介して通信する無線通信部と、
前記無線バックホールリンク上での送信及び前記アクセスリンク上での送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上での送信に起因する第2の受信信号を、受信電力差に基づく干渉除去技術を用いて除去する信号処理部と、
を備える無線通信装置。 - 前記信号処理部は、前記第1の受信信号の受信電力よりも前記第2の受信信号の受信電力がより大きい場合に、前記無線通信部により受信される合成信号から前記第2の受信信号を除去する、請求項1に記載の無線通信装置。
- 前記無線通信装置は、
前記基地局及び前記マスタ端末の送信電力を制御する制御エンティティによる制御結果を示すメッセージに基づいて、前記第1の受信信号の受信電力及び前記第2の受信信号の受信電力のいずれがより大きいかを判定する制御部、
をさらに備える、請求項2に記載の無線通信装置。 - 前記基地局及び前記マスタ端末の送信電力は、前記第1の受信信号の受信電力と前記第2の受信信号の受信電力との間の電力差が閾値以上となるように、前記制御エンティティにより制御される、請求項3に記載の無線通信装置。
- 前記制御部は、前記無線通信装置が受信電力差に基づく前記干渉除去技術を使用可能であることを示すケイパビリティ情報を前記無線通信部を介して前記マスタ端末へ送信し、
前記ケイパビリティ情報は、前記無線バックホールリンク及び前記アクセスリンク上での送信を同一チャネル上で同時に前記マスタ端末に実行させるかを判定するために前記制御エンティティにより使用される、
請求項3に記載の無線通信装置。 - 前記信号処理部は、前記第1の受信信号及び前記第2の受信信号と同一チャネル上で同時に、前記第1の受信信号に干渉する他の装置宛ての第3の受信信号が前記無線通信部により受信される場合に、受信電力差に基づく前記干渉除去技術を用いて前記第3の受信信号をさらに除去する、請求項1に記載の無線通信装置。
- 前記信号処理部は、前記第1の受信信号及び前記第2の受信信号と同一チャネル上で同時に、前記無線通信装置宛ての第4の受信信号が前記無線通信部により受信される場合に、信号間の受信電力差に基づいて、前記無線通信部により受信される合成信号から前記第1の受信信号及び前記第4の受信信号を取得する、請求項1に記載の無線通信装置。
- 無線バックホールリンク上での基地局からマスタ端末への送信及びアクセスリンク上での前記マスタ端末から無線通信装置への送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上の送信に起因する第2の受信信号を前記無線通信装置が受信電力差に基づく干渉除去技術を用いて除去することが可能となるように、前記基地局の送信電力及び前記マスタ端末の送信電力を制御する制御部、
を備える通信制御装置。 - 前記制御部は、前記無線通信装置において前記第1の受信信号の受信電力と前記第2の受信信号の受信電力との間の電力差が閾値以上となるように、前記基地局及び前記マスタ端末の送信電力を制御する、請求項8に記載の通信制御装置。
- 前記制御部は、前記無線バックホールリンクのチャネル状態と前記アクセスリンクのチャネル状態とを比較することにより、前記第1の受信信号の受信電力及び前記第2の受信信号の受信電力のいずれをより大きく設定すべきかを判定する、請求項9に記載の通信制御装置。
- 前記チャネル状態は、各リンクの両端のノード間の距離若しくは経路損失、又は各リンクのチャネル品質を含む、請求項10に記載の通信制御装置。
- 前記制御部は、前記第1の受信信号の受信電力及び前記第2の受信信号の受信電力のいずれがより大きいかを示すメッセージを、前記マスタ端末から前記無線通信装置へ送信させる、請求項8に記載の通信制御装置。
- 前記制御部は、前記マスタ端末と接続する1つ以上の端末がそれぞれ受信電力差に基づく前記干渉除去技術を使用可能であるかを示すケイパビリティ情報に基づいて、前記第1の受信信号を受信すべき前記無線通信装置を前記1つ以上の端末から選択する、請求項8に記載の通信制御装置。
- 前記制御部は、前記1つ以上の端末のアクセスリンクのチャネル状態と前記無線バックホールリンクのチャネル状態とにさらに基づいて、前記第1の受信信号を受信すべき前記無線通信装置を前記1つ以上の端末から選択する、請求項13に記載の通信制御装置。
- 前記制御部は、トラフィック量、端末数及びリソース使用率のうち少なくとも1つを示す負荷情報が閾値を上回る負荷を示す場合に、前記無線バックホールリンク及び前記アクセスリンク上での送信を同一チャネル上で同時に実行させる、請求項8に記載の通信制御装置。
- 基地局と無線バックホールリンクを介して接続するマスタ端末との間でアクセスリンクを介して通信する無線通信装置において、
前記無線バックホールリンク上での送信及び前記アクセスリンク上での送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上での送信に起因する第2の受信信号を、受信電力差に基づく干渉除去技術を用いて除去すること、
を含む、無線通信方法。 - 無線バックホールリンク上での基地局からマスタ端末への送信及びアクセスリンク上での前記マスタ端末から無線通信装置への送信が同一チャネル上で同時に実行される場合に、前記アクセスリンク上の第1の受信信号に干渉する、前記無線バックホールリンク上の送信に起因する第2の受信信号を前記無線通信装置が受信電力差に基づく干渉除去技術を用いて除去することが可能となるように、前記基地局の送信電力及び前記マスタ端末の送信電力を通信制御装置により制御すること、
を含む、通信制御方法。
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CN (1) | CN105830530B (ja) |
AU (1) | AU2014371774B2 (ja) |
BR (1) | BR112016014196A2 (ja) |
TW (1) | TWI659627B (ja) |
WO (1) | WO2015098228A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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US11405811B2 (en) | 2018-01-16 | 2022-08-02 | Sony Corporation | Communication apparatus and communication method |
WO2022264730A1 (ja) * | 2021-06-16 | 2022-12-22 | 日本電気株式会社 | 情報処理装置、情報処理方法、コンピュータ可読媒体、及び無線通信システム |
US11700106B2 (en) | 2018-01-16 | 2023-07-11 | Sony Corporation | Communication apparatus and communication method |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9806827B2 (en) * | 2013-09-13 | 2017-10-31 | Samsung Electronics Co., Ltd. | Computing system with interference cancellation mechanism and method of operation thereof |
US9923705B2 (en) * | 2014-10-06 | 2018-03-20 | Parallel Wireless, Inc. | Full-duplex mesh networks |
US10090957B2 (en) * | 2014-10-06 | 2018-10-02 | Nokia Of America Corporation | Cost effective network interference cancellation for wireless networks |
CN107078825B (zh) * | 2014-11-10 | 2019-07-05 | Lg 电子株式会社 | 在支持中继节点的无线通信***中使用缓存存储器发送/接收数据的方法和装置 |
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US20160219584A1 (en) * | 2015-01-22 | 2016-07-28 | Texas Instruments Incorporated | High performance nlos wireless backhaul frame structure |
US10028228B2 (en) * | 2015-08-07 | 2018-07-17 | Lg Electronics Inc. | Method for transmitting and receiving for power control factor related to considering self-interference cancellation in wireless communication system using FDR mode and devices therefor |
TWI632796B (zh) | 2016-03-04 | 2018-08-11 | 國立清華大學 | 聯合用戶分組與預編碼的方法以及使用所述方法的基地台 |
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EP3499954B1 (en) * | 2016-08-31 | 2021-07-28 | Huawei Technologies Co., Ltd. | Method and apparatus for reporting user equipment capability information |
WO2018094713A1 (zh) * | 2016-11-26 | 2018-05-31 | 华为技术有限公司 | 数据传输方法、装置和*** |
US10244046B2 (en) * | 2016-11-28 | 2019-03-26 | T-Mobile Usa, Inc. | Managing traffic at a node within a wireless communication network upon the node entering service |
TWI631833B (zh) * | 2016-12-14 | 2018-08-01 | 財團法人工業技術研究院 | 資料傳輸模式設定方法及應用其之基站裝置以及終端裝置 |
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US10637588B1 (en) * | 2019-06-10 | 2020-04-28 | Nanning Fugui Precision Industrial Co., Ltd. | Method for eliminating adjacent channel interference and small base station |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010533449A (ja) * | 2007-07-10 | 2010-10-21 | クゥアルコム・インコーポレイテッド | ピア間無線ネットワークにおける1レートフィードバック及び確率アダプテーションに基づく受動逐次型干渉除去のための方法及び受信装置 |
JP2012503346A (ja) * | 2008-07-11 | 2012-02-02 | クゥアルコム・インコーポレイテッド | セル間干渉除去フレームワーク |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7307976B2 (en) * | 2003-02-24 | 2007-12-11 | Autocell Laboratories, Inc. | Program for selecting an optimum access point in a wireless network on a common channel |
US7415278B2 (en) * | 2004-10-27 | 2008-08-19 | Azalea Networks | Method and system for creating and deploying a mesh network |
JP4847540B2 (ja) * | 2005-11-29 | 2011-12-28 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 無線マルチホップ中継ネットワークにおけるスケジューリング |
US20070297366A1 (en) * | 2006-01-05 | 2007-12-27 | Robert Osann | Synchronized wireless mesh network |
US7620370B2 (en) * | 2006-07-13 | 2009-11-17 | Designart Networks Ltd | Mobile broadband wireless access point network with wireless backhaul |
US8849197B2 (en) | 2007-07-10 | 2014-09-30 | Qualcomm Incorporated | Methods and apparatus for active successive interference cancellation in peer-to-peer networks |
US9119212B2 (en) | 2008-07-11 | 2015-08-25 | Qualcomm Incorporated | Inter-cell interference cancellation framework |
US9014636B2 (en) * | 2009-03-20 | 2015-04-21 | Centre Of Excellence In Wireless Technology | Cognitive interference management in wireless networks with relays, macro cells, micro cells, pico cells and femto cells |
CN102474792B (zh) * | 2009-08-11 | 2015-07-29 | 日本电气株式会社 | 切换控制***、目标控制装置、源控制装置、切换控制方法 |
EP2464076A4 (en) * | 2009-10-16 | 2015-02-25 | Lg Electronics Inc | METHOD AND APPARATUS FOR TRANSMITTING MULTI-USER MIMO REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM FOR RELAY ASSISTANCE |
JP5340995B2 (ja) * | 2010-02-26 | 2013-11-13 | 株式会社日立製作所 | 基地局、無線通信システム及び干渉基準のハンドオーバ制御方法 |
JP5249983B2 (ja) * | 2010-04-05 | 2013-07-31 | 株式会社エヌ・ティ・ティ・ドコモ | 無線基地局装置、移動端末装置及びセル選択方法 |
JP2012005015A (ja) * | 2010-06-21 | 2012-01-05 | Ntt Docomo Inc | 無線中継局装置及び移動端末装置 |
JP5529674B2 (ja) * | 2010-08-16 | 2014-06-25 | 株式会社Nttドコモ | 接続方法及び無線基地局 |
JP2012080422A (ja) * | 2010-10-04 | 2012-04-19 | Ntt Docomo Inc | リレー伝送方法及びリレー局 |
CN103299572B (zh) * | 2010-11-10 | 2016-08-10 | 交互数字专利控股公司 | 异构网络中通过连续消除进行干扰抑制的方法和装置 |
US9144069B2 (en) * | 2010-11-12 | 2015-09-22 | Lg Electronics Inc. | Method and device for transmitting and receiving downlink control channel for controlling inter-cell interference in wireless communication system |
US9621365B2 (en) * | 2011-07-08 | 2017-04-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Relaying multicast data in a wireless network |
WO2013021526A1 (ja) * | 2011-08-11 | 2013-02-14 | 日本電気株式会社 | 中継局、基地局、移動通信システム、バックホールリンクの制御方法、及びコンピュータ可読媒体 |
CN102545990B (zh) * | 2011-12-22 | 2014-07-30 | 京信通信***(中国)有限公司 | 一种对接收信号解调的方法及装置 |
US9066367B2 (en) * | 2012-03-29 | 2015-06-23 | Intel Mobile Communications GmbH | Macro-femto inter-cell interference mitigation |
JP6050028B2 (ja) * | 2012-05-25 | 2016-12-21 | シャープ株式会社 | 端末、基地局、通信方法及び集積回路 |
-
2014
- 2014-10-03 AU AU2014371774A patent/AU2014371774B2/en not_active Ceased
- 2014-10-03 CN CN201480068956.3A patent/CN105830530B/zh not_active Expired - Fee Related
- 2014-10-03 US US15/027,382 patent/US9681398B2/en active Active
- 2014-10-03 JP JP2015554617A patent/JP6459978B2/ja not_active Expired - Fee Related
- 2014-10-03 BR BR112016014196A patent/BR112016014196A2/pt not_active Application Discontinuation
- 2014-10-03 WO PCT/JP2014/076623 patent/WO2015098228A1/ja active Application Filing
- 2014-10-03 EP EP14874825.4A patent/EP3089548B1/en active Active
- 2014-12-15 TW TW103143686A patent/TWI659627B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010533449A (ja) * | 2007-07-10 | 2010-10-21 | クゥアルコム・インコーポレイテッド | ピア間無線ネットワークにおける1レートフィードバック及び確率アダプテーションに基づく受動逐次型干渉除去のための方法及び受信装置 |
JP2012503346A (ja) * | 2008-07-11 | 2012-02-02 | クゥアルコム・インコーポレイテッド | セル間干渉除去フレームワーク |
Non-Patent Citations (8)
Title |
---|
"Text Proposal for TR36.923 on Small Cell Enhancement Scenarios", 3GPP TSG RAN WG1 MEETING #72, RL-130748, 28 January 2013 (2013-01-28) |
ACHALESHWAR SAHAI; GAURAV PATEL; ASHUTOSH SABHARWAL: "Pushing the limits of Full-duplex: Design and Real-time Implementation", ARXIV:1 107.0607, 4 July 2011 (2011-07-04) |
ERICSSON WHITE PAPER: 5G RADIO ACCESS, June 2013 (2013-06-01), Retrieved from the Internet <URL:http://www.ericsson.com/res/docs/whitepapers/wp-5g.pdf> |
NEC GROUP: "DISCUSSION ON INTERFERENCE CHARACTERISTICS AND EVALUATION ASSUMPTIONS FOR VARIOUS SMALL CELL SCENARIOS", 3GPP TSG RAN WG1 MEETING 72 R1-130374, 28 January 2013 (2013-01-28) - 1 February 2013 (2013-02-01), ST JULIAN, XP050663453 * |
QUALCOMM INCORPORATED: "Techniques for D2D Communication", 3GPP TSG-RAN WG1 #73 RL-132504, 20 May 2013 (2013-05-20) - 24 May 2013 (2013-05-24), FUKUOKA, JAPAN, XP050698222 * |
SAMSUNG: "Evaluation results on coordination for SCE scenarios with non-ideal backhaul", 3GPP TSG RAN WG1 MEETING #73 RL-131978, 20 May 2013 (2013-05-20) - 24 May 2013 (2013-05-24), FUKUOKA, JAPAN, XP050697762 * |
See also references of EP3089548A4 |
SHI CHENG; RAVI NARASIMHAN: "WCNC", 2013, IEEE, article "Soft interference cancellation receiver for SC-FDMA uplink in LTE", pages: 3318 - 3322 |
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CN106411792A (zh) * | 2015-07-30 | 2017-02-15 | 华为技术有限公司 | 无线通信方法和装置 |
CN106411792B (zh) * | 2015-07-30 | 2019-10-15 | 华为技术有限公司 | 无线通信方法和装置 |
CN109478907A (zh) * | 2016-06-24 | 2019-03-15 | 索尼公司 | 无线通信方法和无线通信设备 |
US11405811B2 (en) | 2018-01-16 | 2022-08-02 | Sony Corporation | Communication apparatus and communication method |
US11700106B2 (en) | 2018-01-16 | 2023-07-11 | Sony Corporation | Communication apparatus and communication method |
WO2022264730A1 (ja) * | 2021-06-16 | 2022-12-22 | 日本電気株式会社 | 情報処理装置、情報処理方法、コンピュータ可読媒体、及び無線通信システム |
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CN105830530A (zh) | 2016-08-03 |
TW201531046A (zh) | 2015-08-01 |
EP3089548A1 (en) | 2016-11-02 |
JP6459978B2 (ja) | 2019-01-30 |
US20160249302A1 (en) | 2016-08-25 |
EP3089548B1 (en) | 2018-08-01 |
BR112016014196A2 (pt) | 2017-08-08 |
EP3089548A4 (en) | 2017-08-02 |
AU2014371774B2 (en) | 2017-05-11 |
CN105830530B (zh) | 2019-09-10 |
AU2014371774A1 (en) | 2016-06-23 |
TWI659627B (zh) | 2019-05-11 |
JPWO2015098228A1 (ja) | 2017-03-23 |
US9681398B2 (en) | 2017-06-13 |
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