WO2015162974A1 - Dispositif et procédé - Google Patents

Dispositif et procédé Download PDF

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Publication number
WO2015162974A1
WO2015162974A1 PCT/JP2015/053705 JP2015053705W WO2015162974A1 WO 2015162974 A1 WO2015162974 A1 WO 2015162974A1 JP 2015053705 W JP2015053705 W JP 2015053705W WO 2015162974 A1 WO2015162974 A1 WO 2015162974A1
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WIPO (PCT)
Prior art keywords
base station
wireless lan
period
frequency band
band
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PCT/JP2015/053705
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English (en)
Japanese (ja)
Inventor
水澤　錦
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ソニー株式会社
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Publication of WO2015162974A1 publication Critical patent/WO2015162974A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present disclosure relates to an apparatus and a method.
  • radio frequency depletion is a problem due to the rapid increase in traffic. Therefore, the possibility of using a frequency band of 5 GHz, which is an unlicensed band, in a cellular system is being studied.
  • the frequency band of 5 GHz band is used in wireless LAN (Local Area Network).
  • a part of the 5 GHz band is used for various radars and satellite communications.
  • wireless LAN access points that use these frequency bands are required to avoid interference with various radar and satellite communications.
  • the operation of DFS includes, for example, radar wave monitoring over 60 seconds.
  • Patent Document 1 when one of two or more wireless LAN access points operating in a WDS (Wireless Distribution System) mode detects a radar wave in a frequency band, a candidate for another frequency band is selected.
  • WDS Wireless Distribution System
  • a technique for notifying the other side, monitoring radar waves in the other frequency band, and transmitting a beacon using the other frequency band if no radar wave is detected is disclosed.
  • the frequency band of 5 GHz band is used in the cellular system, for example, during the period in which the wireless LAN access point performs radar wave monitoring (for example, in-service monitoring) in the frequency band, the signal of the cellular system is It can be sent and received. As a result, the monitoring may not be performed properly due to interference from signals of the cellular system.
  • radar wave monitoring for example, in-service monitoring
  • an acquisition unit that acquires a period during which a wireless LAN station does not transmit a signal using the frequency band for monitoring radar waves in the frequency band, and a base of the cellular system within the period.
  • an apparatus comprising: a control unit that controls radio communication of the base station so that a station does not transmit and receive signals of the cellular system using the frequency band.
  • the wireless LAN station acquires information indicating a period during which no signal is transmitted using the frequency band, and the cellular system includes the cellular system within the period. Controlling a radio communication of the base station by a processor so that the base station does not transmit and receive signals of the cellular system using the frequency band.
  • the present disclosure it is possible to suppress the influence of the cellular system on the radar wave monitoring by the wireless LAN access point.
  • the above effects are not necessarily limited, and any of the effects shown in the present specification or other effects that can be grasped from the present specification are exhibited together with or in place of the above effects. May be.
  • FIG. 4 is an explanatory diagram for describing an example of arrangement of base stations and wireless LAN access points when a base station according to the embodiment is a macro base station.
  • FIG. It is a block diagram which shows an example of a structure of the base station which concerns on the same embodiment. It is explanatory drawing for demonstrating the 1st example of the transmission / reception part contained in a radio
  • elements having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numerals.
  • a plurality of elements having substantially the same functional configuration are differentiated as necessary, such as base stations 100A, 100B, and 100C.
  • base stations 100A, 100B, and 100C when there is no need to particularly distinguish each of a plurality of elements having substantially the same functional configuration, only the same reference numerals are given.
  • the base stations 100A, 100B, and 100C they are simply referred to as the base station 100.
  • the frequency band of 5 GHz is used in the wireless LAN. That is, the frequency band of 5 GHz band is used as a wireless LAN channel. A part of the 5 GHz band is used for various radars and satellite communications. For this reason, wireless LAN access points that use these frequency bands are required to avoid interference with various radar and satellite communications. Specifically, for example, an operation of DFS (Dynamic Frequency Selection) is required for a wireless LAN access point.
  • DFS Dynamic Frequency Selection
  • FIG. 1 is an explanatory diagram for explaining an example of a frequency band in which DFS operation is required.
  • a frequency band 71 from 5.15 GHz to 5.25 GHz a frequency band 73 from 5.25 GHz to 5.35 GHz
  • a frequency band 75 from 5.47 GHz to 5.725 GHz are shown.
  • the frequency band 73 and the frequency band 75 are used for various radars and satellite communications. Therefore, a DFS operation is required for a wireless LAN access point that uses the frequency band 73 and the frequency band 75.
  • the frequency band 71 and the frequency band 73 can be used only indoors, and the frequency band 75 can be used indoors and outdoors.
  • (B) DFS operation As a DFS operation, the wireless LAN access point performs monitoring of radar waves in the frequency band, stop of use of the frequency band, and the like.
  • the wireless LAN access point performs monitoring of radar waves in the frequency band, stop of use of the frequency band, and the like.
  • FIG. 1 A specific example of the operation of the DFS will be described with reference to FIG.
  • FIG. 2 is an explanatory diagram for explaining a specific example of the operation of DFS.
  • the power of the wireless LAN access point is turned on.
  • the wireless LAN access point monitors radar waves in the channel for a predetermined period 82 before starting to use the wireless LAN channel.
  • This monitoring is called pre-operation monitoring or channel availability check.
  • the predetermined period 82 is 60 seconds. If no radar wave is detected in the channel over the predetermined period 82, the wireless LAN access point starts using the channel at a point 83 when the predetermined period 82 has elapsed. Further, the wireless LAN access point monitors radar waves in the channel even after the use of the channel is started.
  • This monitoring is called in-service monitoring or in-service monitoring.
  • the wireless LAN access point detects a radar wave in the monitoring at time 85, the wireless LAN access point stops using the channel within a predetermined period 86.
  • the predetermined period 86 is 10 seconds.
  • the wireless LAN access point cannot use the frequency band for a long period of time (for example, a period of 30 minutes or more).
  • the wireless LAN access point selects another channel after time 85 and tries to resume communication.
  • beacon frame The wireless LAN access point transmits a beacon frame including parameters necessary for joining the network at regular time intervals for network discovery by the wireless LAN station.
  • specific contents of the information included in the beacon frame will be described with reference to FIG.
  • FIG. 3 is an explanatory diagram for explaining information included in the beacon frame.
  • the beacon frame includes a MAC (Media Access Control) header, a frame body, and an FCS (Frame Check Sequence).
  • the frame body includes essential information and may include optional information.
  • the beacon interval is included as essential information.
  • the beacon interval is 16-bit information indicating a beacon frame transmission cycle in a time unit (TU).
  • the beacon transmission cycle is set to 100 TU (about 100 milliseconds).
  • a TPC report is included as option information.
  • the TPC report includes a frame transmission power (dBm) and a link margin (dB) that the station should take for safety.
  • the wireless LAN station can know the propagation loss from the measured reception power and the transmission power, and can set the optimum transmission power based on the propagation loss and the link margin.
  • a quiet element is included as option information.
  • the quiet element is information that designates a time period during which use of the channel by all stations is prohibited in order to know whether there is interference with the radar.
  • specific contents of the quiet element will be described with reference to FIGS. 4 and 5.
  • FIG. 4 is a first explanatory diagram for explaining specific contents of the quiet element.
  • the quiet element includes a quiet count, a quiet period, a quiet duration, and a quiet offset.
  • the quiet count indicates the number of times a beacon frame is transmitted before the quiet period starts.
  • the quiet period indicates the number of beacon intervals included in the quiet period.
  • the quiet duration indicates a period in TU in which a quiet period (that is, a state where the channel is not used by all stations) continues.
  • the quiet offset indicates the time from the end of the beacon frame to the quiet in TU units.
  • FIG. 5 is a second explanatory diagram for explaining the specific contents of the quiet element.
  • a beacon frame is transmitted at a beacon interval 91.
  • a period 93 corresponding to a quiet period starts.
  • the channel is not used by all stations for the period 95 corresponding to the quiet duration only after the period 97 corresponding to the quiet offset.
  • the wireless LAN station acquires the beacon interval and the quiet element by detecting the beacon frame, and does not use the channel for the period 95.
  • the wireless LAN access point monitors radar waves during the period 95. As a result, the wireless LAN access point can monitor the radar wave without receiving interference from the station.
  • Passive scan is a technique for waiting for reception of a beacon frame transmitted by a wireless LAN access point.
  • the active scan is a technique for transmitting a probe request frame and waiting for reception of a probe response frame transmitted by a wireless LAN access point.
  • the probe request frame includes a service set identifier (Service Set Identifier: SSID) for identifying a network (that is, a wireless LAN), and a wireless LAN access point corresponding to the SSID transmits a probe response frame.
  • the probe response frame includes all information included in the beacon frame. Note that the station may transmit a probe request frame including a broadcast SSID instead of a specific SSID in order to discover an arbitrary network (any wireless LAN access point).
  • DCF Distributed Coordination Function
  • PCF Point Coordination Function
  • CSMA / CA Carrier Sense Multiple Access / Collision Avoidance
  • carrier sense is performed in order to confirm whether the wireless LAN channel is busy.
  • Carrier sense includes physical carrier sense and virtual carrier sense.
  • the physical carrier sense is a method for confirming whether the channel is busy in the physical layer
  • the virtual carrier sense is a method for confirming whether the channel is busy by NAV (Network Allocation Vector).
  • NAV Network Allocation Vector
  • FIG. 6 is an explanatory diagram for explaining the mechanism of CSMA / CA.
  • wireless LAN stations 1 to 3 STA-1 to 3
  • AP wireless LAN access point
  • STA1 transmits data to the AP.
  • STA-2 is located within the communication range of STA-1.
  • STA-3 is not located within the communication range of STA-1, but is located within the communication range of AP.
  • STA-1 confirms that no signal is transmitted during a period of DIFS (DCF Inter Frame Spacing) after the busy period ends.
  • DIFS DIFS
  • STA-1 further waits for a back-off time that is randomly set for each terminal device, and transmits an RTS (Request To Send) frame if no signal is transmitted during the back-off time.
  • RTS Request To Send
  • AP and STA-2 receive the RTS frame.
  • the STA-2 acquires a value included in the duration field of the RTS frame and sets the value as a NAV (Network Allocation Vector).
  • NAV Network Allocation Vector
  • the STA-2 refrains from receiving a signal for a period until the transmission of the ACK frame by the AP is completed.
  • the AP transmits a CTS (Clear To Send) frame only after SIFS (Short Inter Frame Space) from the end of the RTS frame.
  • CTS Short Inter Frame Space
  • STA-1 and STA-3 receive the CTS frame.
  • the STA-3 acquires a value included in the duration field of the CTS frame and sets the value as the NAV.
  • the STA-2 refrains from receiving a signal for a period until the transmission of the ACK frame by the AP is completed.
  • the STA-1 transmits a data frame to the AP only after SIFS from the end of the CTS frame.
  • the AP transmits an ACK frame to STA-1 only after SIFS from the end of the data frame. In this way, collisions are avoided because STA-2 and STA-3 refrain from transmitting signals while STA-1 transmits data to the AP.
  • FIG. 7 is an explanatory diagram showing an example of a schematic configuration of the cellular system 1 according to the present embodiment.
  • the cellular system 1 includes a base station 100 and a core network 20.
  • the cellular system 1 is based on, for example, a cellular system communication standard, and the communication standard is, for example, a 3GPP (Third Generation Partnership Project) communication standard. More specifically, for example, the communication standard is LTE, LTE-Advanced, or a communication standard based on these.
  • 3GPP Third Generation Partnership Project
  • the base station 100 is a base station of the cellular system 1 and performs wireless communication with a terminal device.
  • the base station 100 performs wireless communication with a terminal device located in the cell 11 that is a communication area of the base station 100.
  • the base station 100 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.
  • the base station 100 performs radio communication using a frequency band for the cellular system 1 (hereinafter referred to as “cellular band”).
  • the cellular band is, for example, a band included in a license band assigned to an operator of the cellular system 1.
  • the base station 100 supports carrier aggregation and uses a cellular band as a component carrier (Component Carrier: CC).
  • Component Carrier: CC Component Carrier
  • the base station 100 further uses a frequency band used in the wireless LAN (hereinafter referred to as “wireless LAN band”).
  • the frequency band is a wireless LAN channel.
  • the base station 100 uses part or all of the wireless LAN band (for example, wireless LAN channel) as a component carrier (CC).
  • CC component carrier
  • the wireless LAN band can be used for radar wave transmission.
  • a frequency band of 5.25 GHz to 5.35 GHz and a frequency band of 5.47 GHz to 5.725 GHz in the 5 GHz band are used for transmission of radar waves.
  • Radar waves are transmitted by radar stations.
  • a specific example of the arrangement of the radar station and the base station 100 will be described with reference to FIG.
  • FIG. 8 is an explanatory diagram for explaining a specific example of the arrangement of the radar station and the base station 100.
  • a base station 100 and a radar station 30 are shown.
  • the radar station transmits a radar wave that covers the area 31 using the wireless LAN band.
  • the base station 100 is located in the area 31.
  • the cell 11 is a small cell. That is, the base station 100 is a small cell base station (hereinafter referred to as a “small base station”). For example, the cell 11 partially or entirely overlaps with the macro cell.
  • the cell 11 may be a macro cell. That is, the base station 100 may be a macro cell base station (hereinafter referred to as a “macro base station”).
  • a macro base station hereinafter referred to as a “macro base station”.
  • a wireless LAN access point can be arranged in the vicinity of the base station 100.
  • a specific example of this point will be described with reference to FIGS. 9 and 10.
  • FIG. 9 is an explanatory diagram for explaining an example of the arrangement of the base stations 100 and the wireless LAN access points when the base station 100 according to the present embodiment is a small base station.
  • base stations 100A to 100D that are small base stations, macro base station 30 of macro cell 31, terminal devices 40A to 40D, and wireless LAN access points 50A to 50D are shown.
  • the wireless access point 50B is arranged in the vicinity of the base station 100B, and the base station 100B is located in the communication area 51 of the wireless access point 50B.
  • the wireless access point 50D is arranged in the vicinity of the base station 100D, and the base station 100D is located in the communication area 51 of the wireless access point 50D.
  • no wireless access point 50 is arranged in the vicinity of the base station 100A and the base station 100C.
  • FIG. 10 is an explanatory diagram for explaining an example of the arrangement of the base stations 100 and the wireless LAN access points when the base station 100 according to the present embodiment is a macro base station.
  • a base station 100 that is a macro base station, terminal devices 40A to 40D, and wireless LAN access points 50A to 50D are shown.
  • the wireless access point 50C is arranged in the vicinity of the base station 100B, and the base station 100 is located in the communication area 51 of the wireless access point 50C.
  • the core network 20 includes core network nodes.
  • the core network includes, for example, MME (Mobility Management Entity), S-GW (Serving Gateway), and P-GW (Packet Data Network (PDN) Gateway).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • the base station 100 acquires information indicating a period during which the wireless LAN station does not transmit a signal using the wireless LAN band for monitoring radar waves in the wireless LAN band. And the base station 100 does not transmit / receive the signal of the cellular system 1 using the said wireless LAN band within the said period. Thereby, for example, it is possible to suppress interference with radar wave monitoring by the wireless LAN access point.
  • FIG. 11 is a block diagram illustrating an example of the configuration of the base station 100 according to the present embodiment.
  • the base station 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140, and a processing unit 150.
  • the antenna unit 110 radiates the signal output from the wireless communication unit 120 to space as a radio wave. Further, the antenna unit 110 converts radio waves in space into a signal and outputs the signal to the wireless communication unit 120.
  • the antenna unit 110 includes an antenna for a cellular band and an antenna for a wireless LAN band.
  • Wireless communication unit 120 (A) Transmission / reception of signal The wireless communication unit 120 transmits / receives a signal.
  • the radio communication unit 120 transmits a downlink signal to a terminal device located in the cell 11.
  • the wireless communication unit 120 transmits a downlink signal using a cellular band and / or a wireless LAN band.
  • the radio communication unit 120 receives an uplink signal from a terminal device located in the cell 11.
  • the wireless communication unit 120 receives an uplink signal using a cellular band.
  • the wireless communication unit 120 may receive an uplink signal using a wireless LAN band.
  • the wireless communication unit 120 receives a signal from the wireless LAN access point.
  • the wireless communication unit 120 receives a signal from a wireless LAN access point using a wireless LAN band.
  • the wireless communication unit 120 may transmit a signal to the wireless LAN access point.
  • the wireless communication unit 120 may transmit a signal to the wireless LAN access point using the wireless LAN band.
  • the radio communication unit 120 receives a radar wave.
  • the wireless communication unit 120 receives a radar wave using a wireless LAN band.
  • the wireless LAN band is a channel for which DFS is required (hereinafter referred to as “DFS channel”).
  • the wireless communication unit 120 includes a transmission / reception unit for a cellular band and a transmission / reception unit for a wireless LAN band.
  • the cellular band is a frequency band of 2.1 GHz band
  • the wireless LAN band is a frequency band of 5 GHz band.
  • FIG. 12 is an explanatory diagram for explaining a first example of a transmission / reception unit included in the wireless communication unit 120.
  • a cellular band transmission / reception unit 111 and a wireless LAN band transmission / reception unit 113 are shown.
  • the transmission / reception unit 111 for the cellular band includes one reception unit and one transmission unit.
  • the wireless LAN band transceiver 113 also includes one system receiver and one system transmitter.
  • one system of the wireless LAN band transceiver 113 can receive a signal from a wireless LAN access point, a radar wave, and the like.
  • FIG. 13 is an explanatory diagram for describing a second example of the transmission / reception unit included in the wireless communication unit 120.
  • a cellular band transmission / reception unit 111 and a wireless LAN band transmission / reception unit 115 are shown. Similar to the example of FIG. 12, the cellular band transmission / reception unit 111 includes one system of reception unit and one system of transmission unit.
  • the transceiver unit 115 for the wireless LAN band includes two systems of reception units and one system of transmission units.
  • one system of the wireless LAN band transceiver 115 receives a signal from a wireless LAN access point, a radar wave, and the like, and simultaneously receives another system of the transceiver 115.
  • the unit may receive an uplink signal from the terminal device. That is, according to such two systems of receiving units, it is possible to receive signals and radar waves from a wireless LAN access point while using the wireless LAN band as an uplink band in the cellular system.
  • Network communication unit 130 The network communication unit 130 communicates with other nodes. For example, the network communication unit 130 communicates with the core network node of the core network 20. For example, the network communication unit 130 communicates with other base stations.
  • Storage unit 140 The storage unit 140 temporarily or permanently stores a program and data for the operation of the base station 100.
  • the processing unit 150 provides various functions of the base station 100.
  • the processing unit 150 includes an information acquisition unit 151, a communication control unit 153, and a monitoring unit 155.
  • the information acquisition unit 151 is a period during which the wireless LAN station does not transmit a signal using the wireless LAN band for monitoring radar waves in the wireless LAN band (hereinafter referred to as “non-transmission period”). ”) (Hereinafter referred to as“ non-transmission period information ”).
  • the wireless LAN band is a wireless LAN channel.
  • the channel is a channel having a bandwidth of 20 MHz.
  • the channel is a channel for which DFS is required (that is, a DFS channel).
  • the wireless LAN band is a band used by the base station 100.
  • the wireless LAN band is a band operated by the base station 100.
  • -Radar wave monitoring For example, the above monitoring is DFS in-service monitoring.
  • Such in-service monitoring can also be referred to as operational monitoring.
  • the non-transmission period information is information transmitted by a wireless LAN access point. More specifically, for example, the non-transmission period information is a part or all of a quiet element included in a frame transmitted by the wireless LAN access point.
  • the quiet element includes a quiet count, a quiet period, a quiet duration, and a quiet offset.
  • the frame is a beacon frame.
  • the wireless LAN access point transmits a beacon frame including a quiet element, and the base station 100 receives the beacon frame. Then, the information acquisition unit 151 acquires some or all of the quiet elements included in the beacon frame.
  • the frame may be a probe response frame.
  • the base station 100 may transmit a probe request frame
  • the wireless LAN access point may transmit a probe response frame including a quiet element in response to reception of the probe request frame.
  • the base station may receive the probe response frame, and the information acquisition unit 151 may acquire a part or all of the quiet element included in the probe response frame.
  • the base station 100 can know a period during which no signal is transmitted for monitoring (ie, a non-transmission period) without changing the existing wireless LAN mechanism. .
  • the wireless LAN access point is an access point located in the vicinity of the base station 100. That is, the information acquisition unit 151 acquires non-transmission period information transmitted by a wireless LAN access point located in the vicinity of the base station 100. For example, the information acquisition unit 151 acquires a quiet element included in a frame transmitted by a wireless LAN access point located in the vicinity of the base station 100.
  • the processing unit 150 detects a beacon frame transmitted by a wireless LAN access point using the wireless LAN band, and whether the wireless LAN access point is located in the vicinity of the base station 100. Determine. As an example, the processing unit 150 calculates the propagation loss of the beacon frame from the transmission power indicated by the TPC report included in the beacon frame and the reception power of the beacon frame. Then, the processing unit 150 determines whether the wireless LAN access point that transmitted the beacon frame is located in the vicinity of the base station 100 based on the propagation loss. For example, when the propagation loss is less than a predetermined threshold, the processing unit 150 determines that the wireless LAN access point that transmitted the beacon frame is located in the vicinity of the base station 100.
  • the information acquisition unit 151 acquires a quiet element included in the beacon frame.
  • the processing unit 150 determines that the wireless LAN access point that transmitted the beacon frame is not located in the vicinity of the base station 100. In this case, the information acquisition unit 151 does not acquire the quiet element included in the beacon frame.
  • the information acquisition unit 151 may acquire non-transmission period information transmitted by any wireless LAN access point and received by the base station 100.
  • beacon interval information For example, the information acquisition unit 151 includes information indicating an interval at which a wireless LAN access point transmits a beacon frame using the wireless LAN band (hereinafter referred to as “beacon interval information”). get.
  • the beacon interval information is information transmitted by the wireless LAN access point. More specifically, for example, the beacon interval information is information included in a beacon frame transmitted by a wireless LAN access point.
  • the wireless LAN access point transmits a beacon frame including beacon interval information, and the base station 100 receives the beacon frame. Then, the information acquisition unit 151 acquires the beacon interval information included in the beacon frame.
  • the wireless LAN access point is an access point located in the vicinity of the base station 100. That is, the information acquisition unit 151 acquires beacon interval information transmitted by a wireless LAN access point located in the vicinity of the base station 100. For example, the information acquisition unit 151 acquires beacon interval information included in a beacon frame transmitted by a wireless LAN access point located in the vicinity of the base station 100. In this regard, there is no particular difference between the description regarding the beacon interval information and the description regarding the non-transmission period information (for example, a quiet element). Therefore, the overlapping description is omitted here.
  • the information acquisition unit 151 may acquire beacon interval information that is transmitted by any wireless LAN access point and received by the base station 100.
  • (Communication control unit 153) (A) Control of radio communication of base station 100 The communication control unit 153 controls radio communication of the base station 100.
  • A-1) Non-transmission of cellular signal
  • the communication control unit 153 uses the wireless LAN band to transmit a signal of the cellular system 1 (hereinafter referred to as a signal of the cellular system 1) within any period or at any timing.
  • the wireless communication of the base station 100 is controlled so as not to be transmitted / received.
  • the communication control unit 153 does not transmit a signal using the wireless LAN band for the non-transmission period (that is, for monitoring the radar wave in the wireless LAN band). (Period), wireless communication of the base station 100 is controlled so that the base station 100 does not transmit / receive a cellular signal using the wireless LAN.
  • the non-transmission period information indicating the non-transmission period is a part or all of the quiet element.
  • the non-transmission period is a period corresponding to the quiet period included in the quiet element. That is, the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 does not transmit / receive a cellular signal using the wireless LAN within a period corresponding to the quiet period.
  • the base station 100 does not transmit / receive a cellular signal using the wireless LAN within the period 93 corresponding to the quiet period. In other words, the base station 100 transmits or receives a cellular signal using the wireless LAN in any period other than the period 93.
  • the non-transmission period may be a period corresponding to a quiet duration included in the quiet element.
  • the base station 100 may not transmit / receive a cellular signal using the wireless LAN within the period 95 corresponding to the quiet duration. In other words, the base station 100 may transmit or receive a cellular signal using the wireless LAN in any period other than the period 95.
  • the wireless LAN band is used for the downlink.
  • the cellular signal includes, for example, a downlink signal transmitted by the base station 100. That is, the base station 100 does not transmit a downlink signal using the wireless LAN within the non-transmission period.
  • the wireless LAN band may be used for uplink.
  • the cellular signal may include an uplink signal to the base station 100 transmitted by the terminal device. That is, the terminal apparatus does not transmit an uplink signal using the wireless LAN within the non-transmission period, and the base station 100 uses the wireless LAN within the non-transmission period. May not be received.
  • the communication control unit 153 stops transmission / reception of a cellular signal using the wireless LAN band by the base station 100 before the start of the non-transmission period. Moreover, the communication control part 153 can restart transmission / reception of the cellular signal using the said wireless LAN band by the base station 100 after completion
  • the base station 100 uses the wireless LAN band in accordance with CSMA / CA. More specifically, for example, the base station 100 transmits or receives a cellular signal using the wireless LAN band within a period secured by an operation according to CSMA / CA.
  • the above operations include carrier sense, transmission of a predetermined frame for setting NAV, and the like.
  • the communication control unit 153 triggers the stop and restart of the above operation by the base station 100. In this case, the communication control unit 153 triggers the stop and restart of the operation by the base station 100 so that the secured period does not overlap the non-transmission period.
  • the communication control unit 153 triggers the stop of the operation by the base station 100 only a predetermined period before the start of the non-transmission period. Moreover, the communication control part 153 triggers resumption of the said operation
  • the base station 100 does not transmit / receive a cellular signal using the wireless LAN within the non-transmission period. Thereby, for example, it is possible to suppress the influence of the cellular system 1 on the monitoring of radar waves by the wireless LAN access point.
  • the cellular signal may interfere with the radar wave, and the radar wave may not be detected properly. Further, if a cellular signal is transmitted / received within the non-transmission period, the radar wave may be detected even though the radar wave is not transmitted. As described above, there is a possibility that the wireless LAN access point cannot properly detect the radar wave. Therefore, as described above, when the cellular signal is not transmitted / received within the non-transmission period, the wireless LAN access point can appropriately detect the radar wave within the non-transmission period. For example, in this way, the influence of the cellular system 1 on the monitoring of radar waves by the wireless LAN access point can be suppressed.
  • the communication control unit 153 performs wireless communication of the base station 100 so that the base station 100 does not transmit a predetermined frame for setting the NAV using the wireless LAN band within the non-transmission period. Control. Specific processing is as described above. Thereby, for example, it is possible to suppress the influence of the cellular system 1 on the monitoring of radar waves by the wireless LAN access point.
  • the communication control unit 153 prevents the base station 100 from transmitting a cellular signal using the wireless LAN band at a timing when a beacon frame is transmitted using the wireless LAN band. Next, the wireless communication of the base station 100 is controlled.
  • the communication control unit 153 determines the wireless LAN band from the timing at which the beacon frame transmitted using the wireless LAN band is received and the beacon interval information included in the beacon frame. Use to identify when a beacon frame is transmitted. And the communication control part 153 controls the radio
  • the communication control part 153 controls the radio
  • FIG. 14 is an explanatory diagram for explaining an example of timing at which a beacon frame is transmitted.
  • a waveform of a signal of a beacon frame transmitted at a beacon interval 61 is shown.
  • the beacon interval 61 is, for example, about 100 ms
  • the signal width 62 is several tens of microseconds.
  • the base station 100 does not transmit / receive a cellular signal using the wireless LAN at the timing of the width 62 at which the beacon frame is transmitted.
  • the base station 100 transmits or receives a cellular signal using the wireless LAN during a period not including the timing of the width 62.
  • the communication control unit 153 stops transmission / reception of a cellular signal using the wireless LAN band by the base station 100 before the timing. Moreover, the communication control part 153 can restart transmission / reception of the cellular signal which uses the said wireless LAN band by the base station 100 after the said timing.
  • the base station 100 uses the wireless LAN band in accordance with CSMA / CA. More specifically, for example, the base station 100 transmits or receives a cellular signal using the wireless LAN band within a period secured by an operation according to CSMA / CA.
  • the above operations include carrier sense, transmission of a predetermined frame for setting NAV, and the like.
  • the communication control unit 153 triggers the stop and restart of the above operation by the base station 100. In this case, the communication control unit 153 stops the operation by the base station 100 so that the secured period does not overlap the timing (that is, the timing at which the beacon frame is transmitted using the wireless LAN band). And trigger a resume.
  • the communication control unit 153 triggers the stop of the operation by the base station 100 only a predetermined period before the timing. Moreover, the communication control part 153 triggers resumption of the said operation
  • the base station 100 does not transmit / receive a cellular signal using the wireless LAN at the timing described above. Thereby, for example, it becomes possible to suppress interference from the cellular signal to the signal of the beacon frame. Therefore, the wireless LAN station can receive the information included in the beacon frame more reliably. As a result, it is possible to suppress a decrease in communication quality of the wireless LAN.
  • the base station 100 performs an operation according to CSMA / CA regardless of the timing at which the beacon frame is transmitted, and a period including the timing (for example, several tens of microseconds) (for example, a symbol, a slot, or a subframe)
  • the cellular signal transmission within () may be stopped.
  • the communication control unit 153 may not map the signal to the radio resource in the period including the timing. Further, the communication control unit 153 may not allocate radio resources (for example, uplink resources) in the period including the timing to the terminal device.
  • the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 uses the wireless LAN band according to CSMA / CA. To do. That is, through control by the communication control unit 153, the base station 100 uses the wireless LAN band in accordance with CSMA / CA.
  • the base station 100 transmits a cellular signal using the wireless LAN band within a period secured by an operation according to CSMA / CA. Or receive.
  • the operation according to CSMA / CA includes carrier sense, transmission of a predetermined frame for setting NAV, and the like.
  • the predetermined frame is, for example, an RTS frame or a CTS frame.
  • FIG. 15 is an explanatory diagram for explaining a first example of use of a wireless LAN band according to CSMA / CA.
  • a base station 100 and a wireless LAN device (access point or station) are shown.
  • the base station 100 confirms that no signal is transmitted during DIFS after the busy period ends. Thereafter, the base station 100 further waits for a randomly set back-off time, and transmits a CTS frame if no signal is transmitted during the back-off time. Then, the wireless LAN device receives the CTS frame, acquires a value included in the duration field of the CTS frame, and sets the value as NAV.
  • the wireless LAN device refrains from transmitting signals over a period until the NAV is turned off (that is, the NAV becomes 0). Therefore, the base station 100 transmits or receives signals of the cellular system 1 within a period 65 secured by carrier sense and CTS frame transmission (that is, a period from the end of CTS frame transmission until the NAV expires). Therefore, the wireless LAN band is used.
  • the base station 100 may transmit or receive the signal of the cellular system 1 over the entire period 65, or may transmit or receive the signal of the cellular system 1 during a part of the period 65. .
  • the base station 100 may transmit an RTS frame instead of the CTS frame.
  • FIG. 16 is an explanatory diagram for explaining a second example of use of a wireless LAN band according to CSMA / CA.
  • a base station 100 confirms that no signal is transmitted during DIFS after the busy period ends. Thereafter, the base station 100 further waits for a randomly set back-off time, and transmits an RTS frame if no signal is transmitted during the back-off time. Then, the wireless LAN device receives the RTS frame, acquires a value included in the duration field of the RTS frame, and sets the value as NAV.
  • the wireless LAN device refrains from transmitting signals over a period until the NAV is turned off (that is, the NAV becomes 0).
  • a terminal device for example, a terminal device that performs wireless communication with the base station 100 using a cellular band
  • receives the RTS frame and transmits a CTS frame only SIFS after the end of the RTS frame.
  • the wireless LAN device receives the CTS frame, acquires a value included in the duration field of the CTS frame, and sets the value as NAV.
  • the wireless LAN device refrains from transmitting signals over a period until the NAV is turned off (that is, the NAV becomes 0).
  • the base station 100 determines that the cellular system 1 within the period 67 secured by carrier sense and RTS frame transmission (that is, the period from the end of reception of the CTS frame until the time when the NAV expires after SIFS).
  • the wireless LAN band is used for signal transmission or reception.
  • the base station 100 may transmit or receive the signal of the cellular system 1 over the entire period 67, or may transmit or receive the signal of the cellular system 1 during a part of the period 67. .
  • the above-described period to be secured is a period of one subframe or more. Then, the base station 100 transmits or receives a signal of the cellular system 1 using the wireless LAN band over one or more subframes.
  • the wireless LAN band is used according to CSMA / CA.
  • the wireless LAN band can be used fairly with the wireless LAN device.
  • interference between the cellular system 1 and the wireless LAN can be suppressed.
  • the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 uses the wireless LAN band according to CSMA / CA.
  • the communication control unit 153 triggers the stop and restart of the operation according to the CSMA / CA by the base station 100.
  • the operation includes carrier sense and transmission of a predetermined frame (for example, an RTS frame or a CTS frame) for setting the NAV.
  • the communication control unit 153 may not only trigger the above operation but also perform processing for the above operation.
  • the communication control unit 153 may perform processing for carrier sense (for example, trial of signal detection), and processing for transmission of the predetermined frame (for example, generation of the frame and / or The generation of the physical signal of the frame may be performed.
  • (A-3) Transmission or reception of cellular signal For example, the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 transmits or receives the cellular signal using the wireless LAN band. To do.
  • the communication control unit 153 performs processing for transmitting or receiving a cellular signal using the wireless LAN band (hereinafter referred to as “transmission / reception processing”). For example, the communication control unit 153 performs the transmission / reception process within the secured period and does not perform the transmission / reception process outside the secured period.
  • the transmission / reception process includes the RRC (Radio Resource Control) layer, the PDCP (Packet Data convergence Protocol), the RLC (Radio Link Control) layer, the MAC (Medium Access Control) layer, and / or the above wireless LAN band.
  • RRC Radio Resource Control
  • PDCP Packet Data convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • physical layer processing is included.
  • the transmission / reception process includes allocation of radio resources in the wireless LAN band (that is, scheduling) and / or mapping of signals to radio resources in the wireless LAN band.
  • the communication control unit 153 allocates radio resources in the wireless LAN band. More specifically, for example, the communication control unit 153 allocates radio resources (for example, resource blocks) in the wireless LAN band over one or more subframes within the reserved period.
  • radio resources for example, resource blocks
  • the communication control unit 153 performs mapping of a signal to a wireless resource (for example, a resource element) of the wireless LAN band. More specifically, for example, the communication control unit 153 transmits a control signal (for example, a synchronization signal, a reference signal) to a wireless resource in the wireless LAN band over one or more subframes within the reserved period. , And other downlink control signals) and data signals.
  • a control signal for example, a synchronization signal, a reference signal
  • the above-mentioned period to be secured can be a short period.
  • the reserved period can be on the order of several subframes.
  • the base station 100 cannot transmit a synchronization signal (primary synchronization signal and secondary synchronization signal) with a predetermined symbol in the radio frame, and it becomes difficult for the terminal device to acquire synchronization. obtain. Therefore, for example, the communication control unit 153 may map the synchronization signal to the radio resource for each subframe. That is, the base station 100 may transmit a synchronization signal (primary synchronization signal and secondary synchronization signal) for each subframe.
  • the communication control unit 153 may map the primary synchronization signal and the secondary synchronization signal so that the positional relationship between the primary synchronization signal and the secondary synchronization signal is different for each subframe.
  • the terminal device can acquire synchronization in units of subframes.
  • the terminal apparatus may estimate the channel based on a reference signal transmitted in one or more subframes within the reserved period.
  • the communication control unit 153 can control wireless communication of the base station 100 so that the base station 100 transmits or receives a cellular signal using the cellular band.
  • the communication control unit 153 performs wireless communication of the base station 100 so that the base station 100 uses the wireless LAN band as a component carrier (CC) of carrier aggregation. Control. That is, the base station 100 uses the wireless LAN band as a CC for carrier aggregation.
  • CC component carrier
  • the base station 100 uses the wireless LAN band as a CC during a period secured by transmission of a predetermined frame for setting carrier sense and NAV.
  • the base station 100 uses the entire wireless LAN band as one CC.
  • the base station 100 may use a part of the wireless LAN band as one CC.
  • the communication control unit 153 may use a part of the wireless LAN band as the first CC and use another part of the wireless LAN band as the second CC.
  • the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 uses the wireless LAN band as a secondary component carrier (SCC) for carrier aggregation. That is, the base station 100 uses the wireless LAN band as the SCC for carrier aggregation.
  • SCC secondary component carrier
  • the communication control unit 153 activates a CC that is part or all of the wireless LAN band as an SCC for the terminal device.
  • the communication control unit 153 performs cross-carrier scheduling so that scheduling information (resource allocation information) for CCs that are part or all of the wireless LAN band is transmitted using the cellular band.
  • the communication control unit 153 does not select a CC that is a part or all of the wireless LAN band as a handover target CC in handover determination (Handover Decision). For example, the communication control unit 153 does not arrange a random access channel in a CC that is a part or all of the wireless LAN band.
  • part or all of the wireless LAN band is used as an SCC.
  • an increase in PCC handover can be suppressed.
  • the wireless LAN band is used intermittently. Therefore, when a part or all of the wireless LAN band is used as a PCC for the terminal device, handover of the PCC can be frequently performed. That is, the number of PCC handovers can be increased. Therefore, by using part or all of the wireless LAN band as the SCC for the terminal device, an increase in the number of times of PCC handover can be suppressed.
  • the duplex method of the base station 100 is TDD (Time Division Duplex).
  • the base station 100 uses CCs that are part or all of the wireless LAN band as downlink and uplink CCs.
  • the duplex method of the base station 100 may be FDD (Frequency Division Duplex).
  • the base station 100 may use a CC that is part or all of the wireless LAN band as a downlink CC.
  • the base station 100 may use the CC as an uplink CC.
  • (B) Monitoring Control For example, the communication control unit 153 controls the monitoring of radar waves in the wireless LAN band.
  • Period for Monitoring —Non-Transmission Period
  • the communication control unit 153 controls the monitoring so that the radar wave in the wireless LAN band is monitored within the non-transmission period.
  • the monitoring is performed within the non-transmission period.
  • the processing unit 150 finds a wireless LAN access point that uses the wireless LAN band, for example, by detecting a beacon frame transmitted by the wireless LAN access point that uses the wireless LAN band (for example, passive scan). .
  • the processing unit 150 discovers a wireless LAN access point that uses the wireless LAN band by detecting a probe response frame transmitted by the wireless LAN access point that uses the wireless LAN band (for example, active scan). Also good.
  • the processing unit 150 performs processing for transmitting a probe request frame using the wireless LAN band (generation of the probe request frame and / or generation of a physical signal of the probe request frame). Also good.
  • the communication control unit 153 controls the monitoring so that the radar wave in the wireless LAN band is monitored within a predetermined period for the base station 100. .
  • the monitoring is performed within the predetermined period.
  • the monitoring controlled by the communication control unit 153 is monitoring by the base station 100. More specifically, the monitoring is monitoring by the monitoring unit 155.
  • -Radar wave monitoring For example, the above monitoring is DFS in-service monitoring.
  • Such in-service monitoring can also be referred to as operational monitoring.
  • the communication control unit 153 triggers the monitoring of radar waves in the wireless LAN band.
  • the communication control unit 153 causes the base station 100 (monitoring unit 155) to monitor radar waves in the wireless LAN band within the non-transmission period. As a result, the base station 100 (monitoring unit 155) performs the above monitoring. For example, the monitoring unit 155 generates the monitoring result (hereinafter referred to as “monitoring result”), and the communication control unit 153 acquires the monitoring result.
  • monitoring result the monitoring result
  • the communication control unit 153 causes the base station 100 to end use of the wireless LAN band when the radar wave is detected in the monitoring. Control wireless communication.
  • the monitoring result indicates that a radar wave is detected in the monitoring.
  • the communication control unit 153 deactivates the wireless LAN band used as the SCC.
  • the communication control unit 153 cancels the setting (for example, the setting of a frequency band) for hardware and / or software for using the wireless LAN band.
  • the communication control unit 153 terminates the software for using the wireless LAN band.
  • the communication control unit 153 pauses the hardware for using the wireless LAN band.
  • the communication control unit 153 selects another wireless LAN band and performs a process for starting the use of the other wireless LAN band.
  • radar waves are monitored in the wireless LAN band within the non-transmission period. Thereby, for example, it is possible to suppress interference with radar waves due to cellular signals.
  • the monitoring unit 155 monitors radar waves in the wireless LAN band.
  • monitoring is DFS in-service monitoring.
  • in-service monitoring can also be referred to as operational monitoring.
  • the monitoring unit 155 attempts to detect a radar wave in the wireless LAN band (for example, over the non-transmission period or the predetermined period for the base station 100) as the monitoring.
  • the monitoring unit 155 attempts to detect a radar wave from a signal waveform.
  • a radar wave will be described with reference to FIG.
  • FIG. 17 is an explanatory diagram for explaining an example of a pulse waveform of a radar wave.
  • a pulse waveform of a radar wave transmitted at a pulse interval 63 is shown.
  • the pulse interval 63 is, for example, 1.4 ms, and the pulse width 63 is 1 microsecond.
  • the monitoring unit 155 attempts to detect such a radar wave waveform, for example.
  • (C) Operation Trigger For example, the monitoring unit 155 monitors radar waves in the wireless LAN band in accordance with control by the communication control unit 153. That is, the communication control unit 153 causes the monitoring unit 155 to monitor radar waves in the wireless LAN band.
  • FIG. 18 is a flowchart illustrating an example of a schematic flow of processing according to the present embodiment. For example, when the base station 100 starts using the wireless LAN band, the process is executed.
  • the processing unit 150 attempts to find a wireless LAN access point that uses the wireless LAN band (S301). For example, the processing unit 150 attempts to find a wireless LAN access point using the wireless LAN band by detecting a beacon frame or a probe response frame transmitted by the wireless LAN access point using the wireless LAN band.
  • FIG. 19 is a flowchart illustrating an example of a schematic flow of the first communication control process according to the present embodiment.
  • the information acquisition unit 151 acquires information indicating an interval at which the wireless LAN access point transmits a beacon frame using the wireless LAN band (that is, beacon interval information) (S401).
  • the information acquisition unit 151 is information (that is, a non-transmission period) indicating a period in which the wireless LAN station does not transmit a signal using the wireless LAN band for monitoring radar waves in the wireless LAN band (that is, a non-transmission period). (Non-transmission period information) is acquired (S403).
  • beacon transmission timing the timing at which the beacon frame is transmitted
  • the communication control unit 153 When the non-transmission period does not arrive (S405: NO), but when the beacon transmission timing arrives (S407: YES), the communication control unit 153 performs the wireless communication by the base station 100 before the beacon transmission timing. The transmission / reception of the cellular signal using the LAN band is stopped (S409). And the communication control part 153 waits until the said beacon transmission timing passes (S411). Thereafter, the communication control unit 153 resumes transmission / reception of the cellular signal using the wireless LAN band by the base station 100 (S413). Then, the process returns to step S401.
  • the communication control unit 153 stops the transmission / reception of the cellular signal using the wireless LAN band by the base station 100 before the start of the non-transmission period ( S415). Then, the communication control unit 153 causes the base station 100 (monitoring unit 155) to monitor radar waves in the wireless LAN band within the non-transmission period (S417).
  • the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 ends the use of the wireless LAN band ( S421). Then, the process ends.
  • the communication control unit 153 resumes transmission / reception of the cellular signal using the wireless LAN band by the base station 100 (S413). Then, the process returns to step S401.
  • beacon interval information (S401) and the acquisition of non-transmission period information (S403) do not have to be performed every processing loop, and may be performed as necessary.
  • cellular signal transmission / reception may be performed at the beacon transmission timing.
  • steps S401, S407, S409, and S411 may be excluded from the first communication control process.
  • FIG. 20 is a flowchart illustrating an example of a schematic flow of the second communication control process according to the present embodiment.
  • the communication control unit 153 When a predetermined monitoring period for the base station 100 arrives (S501), the communication control unit 153 performs cellular signals using the wireless LAN band by the base station 100 before the start of the predetermined period for the base station 100. Transmission / reception is stopped (S503). Then, the communication control unit 153 causes the base station 100 (monitoring unit 155) to monitor the radar wave in the wireless LAN band within the predetermined period (S505).
  • the communication control unit 153 controls the wireless communication of the base station 100 so that the base station 100 ends the use of the wireless LAN band ( S509). Then, the process ends.
  • the communication control unit 153 resumes the transmission and reception of the cellular signal using the wireless LAN band by the base station 100 (S511). Then, the process returns to step S501.
  • the base station 100 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 base station 100 may be realized as another type of base station such as a NodeB or a BTS (Base Transceiver Station).
  • Base station 100 may include a main body (also referred to as a base station apparatus) that controls radio communication, and one or more RRHs (Remote Radio Heads) that are arranged at locations different from the main body.
  • RRHs Remote Radio Heads
  • various types of terminals such as smartphones, tablet PCs (Personal Computers), notebook PCs, or portable / dongle type mobile routers execute the base station function temporarily or semi-permanently, thereby allowing the base station 100 to May operate as
  • at least some components of the base station 100 may be realized in a base station apparatus or a module for the base station apparatus.
  • FIG. 21 is a block diagram illustrating a first 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. 21, and the plurality of antennas 810 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example.
  • 21 illustrates an example in which the eNB 800 includes a plurality of antennas 810, but 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 wireless communication interface 825 includes a plurality of BB processors 826 as illustrated in FIG. 21, 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. 21, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements, respectively. 21 illustrates 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 wireless communication interface 825 may support a wireless LAN communication method in addition to the cellular communication method, and in that case, may include a BB processor 826 and an RF circuit 827 of the wireless LAN communication method.
  • the eNB 800 illustrated in FIG. 21 one or more components (for example, the information acquisition unit 151, the communication control unit 153, and / or the monitoring unit 155) included in the processing unit 150 described with reference to FIG.
  • the communication interface 825 may be implemented.
  • at least some of these components may be implemented in the controller 821.
  • the eNB 800 includes a module including a part (for example, the BB processor 826) or all of the wireless communication interface 825 and / or the controller 821, and the one or more components may be mounted in the module. Good.
  • the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components).
  • the program may be executed.
  • a program for causing a processor to function as the one or more components is installed in the eNB 800, and the wireless communication interface 825 (eg, the BB processor 826) and / or the controller 821 executes the program.
  • the eNB 800, the base station apparatus 820, or the module may be provided as an apparatus including the one or more components, and a program for causing a processor to function as the one or more components is provided. May be.
  • a readable recording medium in which the program is recorded may be provided.
  • the radio communication unit 120 described with reference to FIG. 11 may be implemented in the radio communication interface 825 (for example, the RF circuit 827). Further, the antenna unit 110 may be mounted on the antenna 810.
  • the network communication unit 130 may be implemented in the controller 821 and / or the network interface 823.
  • FIG. 22 is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied.
  • the eNB 830 includes one or more antennas 840, a base station apparatus 850, and an RRH 860. Each antenna 840 and RRH 860 may be connected to each other via an RF cable. Base station apparatus 850 and RRH 860 can be connected to each other via a high-speed line such as an optical fiber cable.
  • Each of the antennas 840 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 radio signals by the RRH 860.
  • the eNB 830 includes a plurality of antennas 840 as illustrated in FIG. 22, and the plurality of antennas 840 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 22 illustrates an example in which the eNB 830 includes a plurality of antennas 840, but the eNB 830 may include a single antenna 840.
  • the base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857.
  • the controller 851, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG.
  • the wireless communication interface 855 supports a cellular communication method such as LTE or LTE-Advanced, and provides a wireless connection to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840.
  • the wireless communication interface 855 may typically include a BB processor 856 and the like.
  • the BB processor 856 is the same as the BB processor 826 described with reference to FIG. 21 except that the BB processor 856 is connected to the RF circuit 864 of the RRH 860 via the connection interface 857.
  • the wireless communication interface 855 includes a plurality of BB processors 856 as illustrated in FIG.
  • the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 22 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.
  • the wireless communication interface 855 may support a wireless LAN communication method in addition to the cellular communication method, and in that case, may include a BB processor 856 of the wireless LAN communication method.
  • connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860.
  • the connection interface 857 may be a communication module for communication on the high-speed line that connects the base station apparatus 850 (wireless communication interface 855) and the RRH 860.
  • the RRH 860 includes a connection interface 861 and a wireless communication interface 863.
  • connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850.
  • the connection interface 861 may be a communication module for communication on the high-speed line.
  • the wireless communication interface 863 transmits and receives wireless signals via the antenna 840.
  • the wireless communication interface 863 may typically include an RF circuit 864 and the like.
  • the RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives wireless signals via the antenna 840.
  • the wireless communication interface 863 includes a plurality of RF circuits 864 as illustrated in FIG. 22, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements, respectively. 22 illustrates an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.
  • the eNB 830 illustrated in FIG. 22 one or more components (for example, the information acquisition unit 151, the communication control unit 153, and / or the monitoring unit 155) included in the processing unit 150 described with reference to FIG. 11, wireless communication
  • the interface 855 and / or the wireless communication interface 863 may be implemented.
  • at least some of these components may be implemented in the controller 851.
  • the eNB 830 includes a module including a part (for example, the BB processor 856) or the whole of the wireless communication interface 855 and / or the controller 851, and the one or more components are mounted in the module. Good.
  • the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components).
  • the program may be executed.
  • a program for causing a processor to function as the one or more components is installed in the eNB 830, and the wireless communication interface 855 (eg, the BB processor 856) and / or the controller 851 executes the program.
  • the eNB 830, the base station apparatus 850, or the module may be provided as an apparatus including the one or more components, and a program for causing a processor to function as the one or more components is provided. May be.
  • a readable recording medium in which the program is recorded may be provided.
  • the wireless communication unit 120 described with reference to FIG. 11 may be implemented in the wireless communication interface 863 (for example, the RF circuit 864).
  • the antenna unit 110 may be mounted on the antenna 840.
  • the network communication unit 130 may be implemented in the controller 851 and / or the network interface 853.
  • the base station 100 performs a period in which the wireless LAN station does not transmit a signal using the frequency band for monitoring radar waves in the frequency band (that is, the wireless LAN band) (that is, , A non-transmission period) (that is, non-transmission period information) and an information acquisition unit 151 that does not transmit and receive signals of the cellular system 1 using the frequency band within the period.
  • a communication control unit 153 that controls the radio communication of the base station 100.
  • the base station includes a monitoring unit (that is, the base station monitors radar waves in the wireless LAN band), but the present disclosure is not limited to such an example.
  • another device located near the base station may include a monitoring unit, and the device may transmit the monitoring result to the base station.
  • the base station transmits carrier sense and a predetermined frame (a frame for setting an NAV, for example, an RTS frame or a CTS frame) has been described, but the present disclosure is not limited to such an example.
  • another device located in the vicinity of the base station may perform carrier sense and / or transmission of a predetermined frame instead of the base station.
  • the base station uses the wireless LAN band according to CSMA / CA
  • the present disclosure is not limited to such an example.
  • the base station may use the wireless LAN band according to a method other than CSMA / CA.
  • the cellular system is a system that complies with LTE, LTE-Advanced, or a communication standard based on these has been described, the present disclosure is not limited to such an example.
  • the cellular system may be a system that complies with other communication standards.
  • processing steps in the processing of the present specification do not necessarily have to be executed in time series according to the order described in the flowchart or the sequence diagram.
  • the processing steps in the processing may be executed in an order different from the order described as a flowchart or a sequence diagram, or may be executed in parallel.
  • a computer program (in other words, a computer program (in other words, a CPU, a DSP, etc.) provided in the base station of the present specification functions as a constituent element of the base station (eg, an information acquisition unit and a communication control unit)
  • a computer program for causing the processor to execute operations of the components of the base station can also be created.
  • a storage medium storing the computer program may also be provided.
  • An apparatus for example, a finished product or a module for a finished product (a component, a processing circuit, a chip, or the like)
  • a method including operations of the constituent elements of the base station (for example, an information acquisition unit and a communication control unit) is also included in the technology according to the present disclosure.
  • An acquisition unit that acquires information indicating a period during which a wireless LAN (Local Area Network) station does not transmit a signal using the frequency band for monitoring radar waves in the frequency band;
  • a control unit for controlling radio communication of the base station so that a base station of the cellular system does not transmit and receive signals of the cellular system using the frequency band within the period;
  • a device comprising: (2) The apparatus according to (1), wherein the information indicating the period is information transmitted by a wireless LAN access point.
  • the information indicating the period is a part or all of a quiet element included in a frame transmitted by a wireless LAN access point.
  • the frame is a beacon frame or a probe response frame.
  • the period is a period corresponding to a quiet period or a quiet duration included in the quiet element.
  • the wireless LAN access point is an access point located in the vicinity of the base station.
  • the acquisition unit acquires information indicating an interval at which a wireless LAN access point transmits a beacon frame using the frequency band,
  • the control unit performs wireless communication of the base station so that the base station does not transmit / receive a signal of the cellular system using the frequency band at a timing at which the beacon frame is transmitted using the frequency band.
  • the apparatus according to any one of (1) to (6), wherein the apparatus is controlled.
  • the information indicating the interval is information included in a beacon frame transmitted by the wireless LAN access point.
  • the control unit controls the monitoring so that radar waves in the frequency band are monitored within the period.
  • the apparatus (10) The apparatus according to (9), wherein the monitoring controlled by the control unit is monitoring by the base station.
  • the monitoring controlled by the control unit is in-service monitoring of DFS (Dynamic Frequency Selection).
  • the control unit controls radio communication of the base station so that the base station terminates use of the frequency band when a radar wave is detected in the monitoring, (9) to (11 )
  • the apparatus according to any one of (13)
  • the control unit controls the radio communication of the base station so that the base station uses the frequency band according to CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance).
  • the apparatus of any one of Claims (14)
  • the control unit controls radio communication of the base station so that the base station does not transmit a predetermined frame for setting NAV (Network Allocation Vector) using the frequency band within the period.
  • NAV Network Allocation Vector
  • the control unit controls radio communication of the base station so that the base station uses the frequency band as a secondary component carrier for carrier aggregation. Equipment.
  • the monitoring is DFS in-service monitoring.
  • the frequency band is a wireless LAN channel.
  • the channel is a channel for which DFS is required.
  • the apparatus according to any one of (1) to (18), wherein the apparatus is the base station, a base station apparatus for the base station, or a module for the base station apparatus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Le problème décrit par l'invention est de rendre possible de supprimer l'influence exercée par un système cellulaire sur une surveillance d'ondes radar par un point d'accès LAN sans fil. La solution de la présente invention concerne un dispositif qui est pourvu : d'une unité d'acquisition qui acquiert des informations indiquant une période pendant laquelle, pour des raisons de surveillance d'ondes radar dans une bande de fréquence, une station de réseau local (LAN) sans fil n'émet pas un signal utilisant la bande de fréquence ; et d'une unité de commande qui commande une communication sans fil par une station de base de système cellulaire de manière que, pendant la période susmentionnée, la station de base n'émette/ne reçoive pas un signal de système cellulaire utilisant la bande de fréquence susmentionnée.
PCT/JP2015/053705 2014-04-22 2015-02-10 Dispositif et procédé WO2015162974A1 (fr)

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JP2014-088085 2014-04-22
JP2014088085 2014-04-22

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012085329A (ja) * 2011-12-05 2012-04-26 Sharp Corp 無線ｌａｎシステムの基地局及び端末
JP2013251926A (ja) * 2013-09-18 2013-12-12 Nec Commun Syst Ltd 無線装置、無線通信システム、制御方法及び制御プログラム
JP2014502083A (ja) * 2010-11-05 2014-01-23 インターデイジタル パテント ホールディングス インコーポレイテッド 動的スペクトル管理のためのサイレント期間方法および装置

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JP2014502083A (ja) * 2010-11-05 2014-01-23 インターデイジタル パテント ホールディングス インコーポレイテッド 動的スペクトル管理のためのサイレント期間方法および装置
JP2012085329A (ja) * 2011-12-05 2012-04-26 Sharp Corp 無線ｌａｎシステムの基地局及び端末
JP2013251926A (ja) * 2013-09-18 2013-12-12 Nec Commun Syst Ltd 無線装置、無線通信システム、制御方法及び制御プログラム

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