WO2014112595A1 - 通信制御方法 - Google Patents
通信制御方法 Download PDFInfo
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- WO2014112595A1 WO2014112595A1 PCT/JP2014/050836 JP2014050836W WO2014112595A1 WO 2014112595 A1 WO2014112595 A1 WO 2014112595A1 JP 2014050836 W JP2014050836 W JP 2014050836W WO 2014112595 A1 WO2014112595 A1 WO 2014112595A1
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- WIPO (PCT)
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- user terminal
- base station
- cellular
- specific device
- cellular base
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/06—Access restriction performed under specific conditions based on traffic conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a communication control method for linking a cellular communication system with a wireless LAN system.
- the load on the cellular communication system can be distributed to the wireless LAN system by strengthening the cooperation between the cellular communication system and the wireless LAN system.
- an object of the present invention is to provide a communication control method capable of enhancing cooperation between a cellular communication system and a wireless LAN system.
- the communication control method is a method for performing offload from the cellular RAN to the wireless LAN.
- a cellular base station included in the cellular RAN transmits a list including identifiers of wireless LAN access points included in the wireless LAN, and a user terminal having a cellular communication unit and a wireless LAN communication unit Receiving the list, and detecting that the user terminal located in the cell of the cellular base station is close to the wireless LAN access point based on the list, Performing an operation relating to.
- the communication control method is a method for performing offload from the cellular RAN to the wireless LAN.
- a cellular base station included in the cellular RAN includes a step of transmitting information for the offload, a cellular communication unit, and a wireless LAN communication unit.
- a user terminal in service area receives the information from the cellular base station, and the user terminal performs an operation related to the offload based on the information received from the cellular base station.
- the communication control method includes a step in which a specific device cooperating with a cellular base station broadcasts a discovery signal for notifying the presence of the specific device within a cellular frequency band and in a specific period; A user terminal connected to the cellular base station scanning the discovery signal within the cellular frequency band and in the specific period.
- a communication control method includes a step in which a user terminal connected to a cellular base station receives a cellular reference signal broadcast from a specific device within a cellular frequency band included in a license band, and the cellular reference signal Reporting measurement information indicating a measurement result for the user terminal to the cellular base station, and the cellular base station scanning the specific device based on the measurement information reported from the user terminal. Transmitting information to the user terminal.
- the specific device is a device that performs communication in an unlicensed band.
- a communication control method includes a step in which a specific device that communicates in an unlicensed band detects a cellular uplink signal transmitted by a user terminal connected to a cellular base station, and the specific device includes the cellular device. Based on detection of an uplink signal, transmitting a notification indicating that the user terminal has approached the specific device to the cellular base station, and the cellular base station based on the notification from the specific device Transmitting to the user terminal information for scanning the specific device.
- a communication control method includes a cellular communication unit and a wireless LAN communication unit, and a user terminal connected to a cellular base station derives a moving speed of the user terminal, and the movement When the speed exceeds the threshold value, there is a stopping step in which the user terminal stops scanning the wireless LAN access point even if the wireless LAN communication unit is in an on state.
- the communication control method when a user terminal switches a connection destination from a specific device to a cellular base station, notification information indicating that the user device is switched from the specific device to the cellular base station is transmitted to the user terminal.
- the cellular base station transmits request information requesting to transfer transmission data addressed to the user terminal to the cellular base station.
- the specific device is a device that performs communication in an unlicensed band.
- the specific device when the connection destination of the user terminal is switched from a specific device provided in the coverage of the cellular base station to the cellular base station, the specific device Determining that the connection destination of the user terminal is to be switched to the cellular base station without receiving a measurement report from the user terminal; and request information for requesting switching to the cellular base station from the specific device to the cellular terminal. Transmitting to the base station, and when the specific device receives a response to the request information from the cellular base station, transmits instruction information for instructing switching to the cellular base station from the specific device to the user terminal. Including the steps of:
- the specific device is a device that performs communication in an unlicensed band.
- the communication control method is a method for performing offload from the cellular RAN to the wireless LAN.
- a cellular base station included in the cellular RAN transmits a list including identifiers of wireless LAN access points included in the wireless LAN, and a user terminal having a cellular communication unit and a wireless LAN communication unit Receiving the list, and detecting that the user terminal located in the cell of the cellular base station is close to the wireless LAN access point based on the list, Performing an operation relating to.
- “detecting close proximity” means “recognizing close proximity”, and may not actually be close (in the case of erroneous detection). The same applies to the following.
- the wireless LAN communication unit in the step of performing the operation related to offloading, after detecting that the user terminal in which the wireless LAN communication unit is in an off state has approached the wireless LAN access point based on the list, The wireless LAN communication unit is switched on to scan the wireless LAN access point.
- the operation includes scanning the wireless LAN access point.
- the communication control method further includes a step of transmitting a notification indicating that the wireless LAN access point has been discovered from the user terminal to the cellular base station when the wireless LAN access point has been discovered by the scanning. .
- the notification includes an identifier of the discovered wireless LAN access point.
- the wireless LAN access point corresponding to the identifier included in the notification is in an off state, the wireless LAN access point An activation step of activating.
- the cellular base station transmits the list to the user terminal based on a load level related to its own cellular base station.
- the communication control method further includes a step of determining whether or not the user terminal uses the list based on a situation of the user terminal.
- the list includes an identifier of a wireless LAN access point provided in a cell of the cellular base station or an identifier of a wireless LAN access point provided in a tracking area including the cell.
- the communication control method is a method for performing offload from the cellular RAN to the wireless LAN.
- a cellular base station included in the cellular RAN includes a step of transmitting information for the offload, a cellular communication unit, and a wireless LAN communication unit.
- a user terminal in service area receives the information from the cellular base station, and the user terminal performs an operation related to the offload based on the information received from the cellular base station.
- the user terminal in the step of performing the operation, the user terminal, based on the information received from the cellular base station, when the wireless LAN communication unit is in an off state, The wireless LAN communication unit is switched on and the wireless LAN access point is scanned.
- the cellular base station transmits the information to one or a plurality of user terminals when the load level of the own cellular base station exceeds a threshold value.
- the communication control method when the wireless LAN access point is discovered by the scan, notifies the user terminal that the wireless LAN access point has been discovered from the user terminal.
- the method further includes transmitting to the cellular base station.
- the information is information instructing to switch the wireless LAN communication unit to an on state.
- the information includes position information indicating the position of the wireless LAN access point.
- the user terminal performs the operation when detecting that the user terminal has approached the wireless LAN access point based on the position information.
- the information includes condition information indicating a condition for performing the operation.
- the user terminal performs the operation when detecting that the condition is satisfied based on the condition information.
- the information includes a parameter applied to the operation.
- the communication control method further includes a step of determining whether the cellular base station transmits the information to the user terminal based on a situation of the user terminal. Including.
- a specific device cooperating with a cellular base station broadcasts a discovery signal for notifying the presence of the specific device within a cellular frequency band and in a specific period;
- a user terminal connected to the cellular base station scanning the discovery signal within the cellular frequency band and in the specific period.
- the specific period is specified by the cellular base station.
- the specific device is a device that performs communication outside the cellular frequency band.
- the cellular base station is a base station that performs communication at a first frequency within the cellular frequency band.
- the specific device is a device that performs communication at a second frequency within the cellular frequency band.
- the broadcasting step the specific device broadcasts the discovery signal at the first frequency in the cellular frequency band and at the specific period.
- the scanning step the user terminal scans the discovery signal at the first frequency in the cellular frequency band and at the specific period.
- the discovery signal includes an identifier of the specific device.
- the communication control method when the user terminal detects the discovery signal by the scan, the communication control method sends a discovery notification indicating that the discovery signal has been detected from the user terminal to the cellular base station.
- the method further includes the step of transmitting to.
- the communication control method includes: connecting the user terminal to the specific device when the user terminal is connected to the specific device after the user terminal detects the discovery signal by the scan.
- the method further includes a step of transmitting a connection notification indicating that the connection has been made from the specific device to the cellular base station.
- the specific device is a wireless LAN access point.
- the specific device is a cellular base station that manages a small cell.
- the specific device is another user terminal that supports inter-terminal wireless communication.
- the cellular frequency band is included in the license band.
- the specific device is another cellular base station that performs communication in an unlicensed band.
- the communication control method includes a step in which a user terminal connected to a cellular base station receives a cellular reference signal broadcast from a specific device within a cellular frequency band included in a license band, and the cellular reference signal Reporting measurement information indicating a measurement result for the user terminal to the cellular base station, and the cellular base station scanning the specific device based on the measurement information reported from the user terminal. Transmitting information to the user terminal.
- the specific device is a device that performs communication in an unlicensed band.
- a cell identifier for identifying the specific device is assigned to the specific device.
- the cellular reference signal transmitted by the specific device includes the cell identifier.
- the communication control method includes a step in which a specific device that performs communication in an unlicensed band detects a cellular uplink signal transmitted by a user terminal connected to a cellular base station, and the specific device includes the cellular device. Based on detection of an uplink signal, transmitting a notification indicating that the user terminal has approached the specific device to the cellular base station, and the cellular base station based on the notification from the specific device Transmitting to the user terminal information for scanning the specific device.
- the communication control method further includes a step in which the specific device determines whether or not the user terminal is close to the self-specific device.
- the determining step includes: obtaining signal information related to a cellular uplink signal transmitted by the user terminal from the cellular base station; and determining a path loss between the user terminal and the specific device based on the signal information. And a step of determining that the user terminal is close to the specific device when the path loss is less than a threshold.
- the communication control method allows the specific device to transmit the specific device based on the distance between the specific device and the cellular base station and the received power of the cellular uplink signal.
- the method further includes determining whether or not the user terminal is in proximity.
- the communication control method includes a cellular communication unit and a wireless LAN communication unit, and a user terminal connected to a cellular base station derives a moving speed of the user terminal, and the movement When the speed exceeds the threshold value, there is a stopping step in which the user terminal stops scanning the wireless LAN access point even if the wireless LAN communication unit is in an on state.
- notification information indicating switching from the specific device to the cellular base station is transmitted to the user terminal.
- the cellular base station transmits request information requesting to transfer transmission data addressed to the user terminal to the cellular base station.
- the specific device is a device that performs communication in an unlicensed band.
- the notification information includes an identifier for identifying the specific device.
- the notification information includes an identifier for identifying the user terminal.
- the specific device when the connection destination of the user terminal is switched from a specific device provided in the coverage of the cellular base station to the cellular base station, the specific device Determining that the connection destination of the user terminal is to be switched to the cellular base station without receiving a measurement report from the user terminal; and request information for requesting switching to the cellular base station from the specific device to the cellular terminal. Transmitting to the base station, and when the specific device receives a response to the request information from the cellular base station, transmits instruction information for instructing switching to the cellular base station from the specific device to the user terminal. Including the steps of:
- the specific device is a device that performs communication in an unlicensed band.
- FIG. 1 is a system configuration diagram according to the first embodiment.
- the LTE system includes a plurality of UEs (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- the E-UTRAN 10 corresponds to a radio access network.
- the EPC 20 corresponds to a core network.
- the UE 100 is a mobile radio communication device, and performs radio communication with a cell that has established a connection.
- UE100 is corresponded to a user terminal.
- the UE 100 is a terminal (dual terminal) that supports both cellular communication and WLAN communication methods.
- the E-UTRAN 10 includes a plurality of eNBs 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 manages one or a plurality of cells, and performs radio communication with the UE 100 that has established a connection with the own cell.
- “cell” is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
- the eNB 200 has, for example, a radio resource management (RRM) function, a user data routing function, and a measurement control function for mobility control and scheduling.
- RRM radio resource management
- the eNB 200 is connected to each other via the X2 interface.
- the eNB 200 is connected to the MME / S-GW 500 included in the EPC 20 via the S1 interface.
- the EPC 20 includes a plurality of MME (Mobility Management Entity) / S-GW (Serving-Gateway) 500.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- the MME is a network node that performs various types of mobility control for the UE 100, and corresponds to a control station.
- the S-GW is a network node that performs transfer control of user data, and corresponds to an exchange.
- the WLAN system includes a WLAN AP (hereinafter referred to as “AP”) 300.
- the WLAN system is configured in accordance with, for example, IEEE 802.11 standards.
- the AP 300 communicates with the UE 100 in a frequency band (WLAN frequency band) different from the cellular frequency band.
- the AP 300 is connected to the EPC 20 via a router or the like.
- the AP 300 is operated by an operator of a cellular communication system (LTE system).
- LTE system cellular communication system
- the cellular frequency band is included in a license band (a frequency band requiring a license).
- the WLAN frequency band is included in an unlicensed band (a frequency band that does not require a license).
- FIG. 2 is a block diagram of the UE 100.
- the UE 100 includes antennas 101 and 102, a cellular transceiver (cellular communication unit) 111, a WLAN transceiver (WLAN communication unit) 112, a user interface 120, and a GNSS (Global Navigation Satellite System).
- a receiver 130, a battery 140, a memory 150, and a processor 160 are included.
- the memory 150 and the processor 160 constitute a control unit.
- the UE 100 may not have the GNSS receiver 130.
- the memory 150 may be integrated with the processor 160, and this set (that is, a chip set) may be used as the processor 160 '.
- the antenna 101 and the cellular transceiver 111 are used for transmitting and receiving cellular radio signals.
- the cellular transceiver 111 converts the baseband signal output from the processor 160 into a cellular radio signal and transmits it from the antenna 101.
- the cellular transceiver 111 converts a cellular radio signal received by the antenna 101 into a baseband signal and outputs it to the processor 160.
- the antenna 102 and the WLAN transceiver 112 are used for transmitting and receiving WLAN radio signals.
- the WLAN transceiver 112 converts the baseband signal output from the processor 160 into a WLAN radio signal and transmits it from the antenna 102. Further, the WLAN transceiver 112 converts the WLAN radio signal received by the antenna 102 into a baseband signal and outputs the baseband signal to the processor 160.
- the user interface 120 is an interface with a user who owns the UE 100, and includes, for example, a display, a microphone, a speaker, and various buttons.
- the user interface 120 receives an input from the user and outputs a signal indicating the content of the input to the processor 160.
- the GNSS receiver 130 receives a GNSS signal and outputs the received signal to the processor 160 in order to obtain location information indicating the geographical location of the UE 100.
- the battery 140 stores power to be supplied to each block of the UE 100.
- the memory 150 stores a program executed by the processor 160 and information used for processing by the processor 160.
- the processor 160 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes programs stored in the memory 150 and performs various processes.
- the processor 160 may further include a codec that performs encoding / decoding of an audio / video signal.
- the processor 160 executes various processes and various communication protocols described later.
- FIG. 3 is a block diagram of the eNB 200.
- the eNB 200 includes an antenna 201, a cellular transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 and the processor 240 constitute a control unit.
- the memory 230 may be integrated with the processor 240, and this set (ie, chip set) may be used as the processor 240 '.
- the antenna 201 and the cellular transceiver 210 are used for transmitting and receiving cellular radio signals.
- the cellular transceiver 210 converts the baseband signal output from the processor 240 into a cellular radio signal and transmits it from the antenna 201.
- the cellular transceiver 210 converts a cellular radio signal received by the antenna 201 into a baseband signal and outputs it to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 500 via the S1 interface.
- the network interface 220 is used for communication with the AP 300 via the EPC 20.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes a program stored in the memory 230 and performs various processes.
- the processor 240 executes various processes and various communication protocols described later.
- FIG. 4 is a block diagram of the AP 300.
- the AP 300 includes an antenna 301, a WLAN transceiver 311, a network interface 320, a memory 330, and a processor 340.
- the memory 330 may be integrated with the processor 340, and this set (ie, chip set) may be used as the processor 340 '.
- the antenna 301 and the WLAN transceiver 311 are used for transmitting and receiving WLAN radio signals.
- the WLAN transceiver 311 converts the baseband signal output from the processor 340 into a WLAN radio signal and transmits it from the antenna 301.
- the WLAN transceiver 311 converts the WLAN radio signal received by the antenna 301 into a baseband signal and outputs the baseband signal to the processor 340.
- the network interface 320 is connected to the EPC 20 via a router or the like.
- the network interface 320 is used for communication with the eNB 200 via the EPC 20.
- the memory 330 stores a program executed by the processor 340 and information used for processing by the processor 340.
- the processor 340 includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU that executes programs stored in the memory 330 and performs various processes.
- FIG. 5 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 5, the radio interface protocol is divided into layers 1 to 3 of the OSI reference model, and layer 1 is a physical (PHY) layer. Layer 2 includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer. Layer 3 includes an RRC (Radio Resource Control) layer.
- PHY Physical
- Layer 2 includes a MAC (Media Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
- Layer 3 includes an RRC (Radio Resource Control) layer.
- RRC Radio Resource Control
- the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data is transmitted between the physical layer of the UE 100 and the physical layer of the eNB 200 via a physical channel.
- the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), and the like. Data is transmitted via the transport channel between the MAC layer of the UE 100 and the MAC layer of the eNB 200.
- the MAC layer of the eNB 200 includes a scheduler that determines uplink / downlink transport formats (transport block size, modulation / coding scheme, and the like) and allocated resource blocks.
- the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data is transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 via a logical channel.
- the PDCP layer performs header compression / decompression and encryption / decryption.
- the RRC layer is defined only in the control plane. Control messages (RRC messages) for various settings are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
- the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
- RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in a connected state (RRC connected state). Otherwise, the UE 100 is in an idle state (RRC idle state).
- the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
- FIG. 6 is a configuration diagram of a radio frame used in the LTE system.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- SC-FDMA Single Carrier Frequency Multiple Access
- the radio frame is composed of ten subframes arranged in the time direction, and each subframe is composed of two slots arranged in the time direction.
- the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
- the resource block includes a plurality of subcarriers in the frequency direction.
- frequency resources can be specified by resource blocks, and time resources can be specified by subframes (or slots).
- the section of the first few symbols of each subframe is a control region mainly used as a physical downlink control channel (PDCCH).
- the remaining section of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH).
- PDSCH physical downlink shared channel
- reference signals such as cell-specific reference signals are distributed and arranged in each subframe.
- both ends in the frequency direction in each subframe are control regions mainly used as a physical uplink control channel (PUCCH). Further, the central portion in the frequency direction in each subframe is an area that can be used mainly as a physical uplink shared channel (PUSCH).
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- FIG. 7 is a diagram for explaining the operating environment according to the first embodiment.
- AP300 (AP300-1 to AP300-3) is provided in the coverage of eNB200.
- the eNB 200 manages a wide range of cells (large cells).
- the large cell is a general cell in the LTE system and is referred to as a macro cell.
- a small cell having a narrower coverage than the macro cell may be provided in the macro cell coverage.
- Small cells are referred to as picocells or femtocells.
- a small cell belongs to a frequency within the cellular frequency band and different from the frequency to which the macro cell belongs.
- the small cell is managed by the HeNB 400 (pico eNB or femto eNB).
- the UE 100-1 to UE 100-3 are connected to the cell (macro cell) of the eNB 200 and perform cellular communication with the eNB 200.
- the load level of eNB200 becomes high. That is, the radio resources (resource blocks and the like) that can be allocated to each UE 100 by the eNB 200 are reduced.
- the AP 300 is operated by an operator of a cellular communication system (in this embodiment, an LTE system). Such an AP 300 is referred to as a Planned AP.
- the UE 100-4 is connected to the AP 300-3 and performs WLAN communication with the AP 300-3.
- 1st Embodiment is embodiment which distributes the load of eNB200 to AP300 (offload).
- the UE 100 stores a list (hereinafter referred to as “AP white list”) related to the AP 300 (Planned AP) to which the UE 100 can connect.
- the AP white list includes an identifier of the AP 300 to which the UE 100 can be connected.
- the AP white list may further include AP position information regarding the peripheral position of the AP 300.
- the AP white list may further include a cell identifier (cell identifier) of the eNB 200.
- the identifier of the AP 300 is, for example, SSID (Service Set Identifier) or ESSID (Extended Service Set Identifier).
- the AP white list includes a case where the UE 100 updates autonomously, a case where the eNB 200 sets the UE 100, and a case where these are combined.
- the UE 100 autonomously updates the AP white list
- the UE 100 updates the AP white list when it is notified from the AP 300 that the AP 300 is a Planned AP after connecting to the AP 300.
- the eNB 200 sets the AP white list in the UE 100
- the UE 100 receives the AP white list for each AP 300 provided in the coverage of the eNB 200 from the eNB 200 and stores it.
- the AP white list may be managed in units of eNB 200 (or in units of cells) or may be managed in units of tracking areas.
- the eNB 200 may determine whether to transmit the AP white list to the UE 100. For example, when it is estimated that the UE 100 is moving at a high speed from the number of handovers per unit time, location information, and the like and it is estimated that the UE 100 is out of the coverage of the eNB 200, the AP white list is not passed to the UE 100. Alternatively, such a determination may be performed on the UE 100 side. Specifically, the UE 100 storing the AP whitelist is estimated to be moving at a high speed based on, for example, the number of handovers per unit time and location information, and is estimated to be out of the coverage of the eNB 200. In such a case, the AP white list is not used.
- the eNB 200 may adjust the number of APs 300 included in the AP white list before transmitting the AP white list to the UE 100.
- the moving speed of the UE 100 is estimated from the number of handovers per unit time, position information, and the like. The lower the moving speed of the UE 100, the narrower the geographical range of the AP 300 included in the AP white list, and the AP 300 included in the AP white list. Reduce the number of Alternatively, such adjustment may be performed on the UE 100 side.
- the UE 100 storing the AP white list estimates the moving speed of the UE 100 from, for example, the number of handovers per unit time and location information, and the lower the moving speed of the UE 100, the more included in the AP white list.
- the geographical range of the target AP 300 is narrowed to reduce the number of target APs 300.
- the UE 100 may determine whether or not to use the AP white list in consideration of the traffic amount or traffic type transmitted / received by itself or the wireless communication environment of the UE 100. For example, the UE 100 uses the AP white list when the amount of traffic transmitted / received by the UE 100 is large or when the QoS of the traffic transmitted / received by the UE 100 is low. Otherwise, the AP whitelist is not used.
- the eNB 200 may be set in the UE 100 without including the AP information in the AP white list when offloading is unnecessary.
- the UE 100 detects that the UE 100 has approached the AP 300 based on the AP white list. For example, the UE 100 can detect that the UE 100 has approached the AP 300 by comparing the UE position information obtained by the GNSS receiver 130 or the UE position information obtained from the network with the AP position information.
- “detecting close proximity” means “recognizing close proximity” as described above, and may not actually be close (in the case of erroneous detection).
- the UE 100 detects that it is close to the AP 300 by comparing the cell identifier of the connection destination cell with the cell identifier included in the AP white list. May be.
- the UE 100 switches the WLAN transceiver 112 to the on state and performs a WLAN scan. Specifically, the UE 100 confirms whether or not the WLAN signal (beacon signal) from the AP 300 can be received.
- the UE 100 may perform a WLAN scan on a beacon signal including the identifier (SSID / ESSID) of the AP 300 that has detected proximity based on the AP white list.
- the UE 100 close to the AP 300 can discover the AP 300.
- the AP 300 can be efficiently used, and the load of the eNB 200 can be distributed (offloaded) to the AP 300.
- FIG. 8 is a sequence diagram of the operation pattern 1 according to the first embodiment.
- the UE 100 is connected to the eNB 200 and the WLAN transceiver 112 is turned off.
- eNB200 and AP300 are performing the negotiation for operating
- step S1102 the eNB 200 transmits an AP white list to the UE 100.
- the AP whitelist is transmitted using an RRC message.
- the UE 100 stores the AP whitelist received from the eNB 200.
- step S1102 may be unnecessary.
- step S1103 the UE 100 determines whether or not the UE 100 has approached the AP 300 based on the AP white list.
- the description will proceed on the assumption that the UE 100 has detected that the UE 100 has approached the AP 300.
- step S1104 the UE 100 switches the WLAN transceiver 112 to the on state and starts a WLAN scan.
- step S1105 the UE 100 receives a beacon signal from the AP 300.
- step S1106 the UE 100 discovers the AP 300 based on the beacon signal received from the AP 300. Moreover, UE100 extracts the identifier (SSID / ESSID) contained in the beacon signal received from AP300.
- SSID / ESSID the identifier
- the UE 100 transmits a discovery notification (AP discovery notification) indicating that the AP 300 has been discovered to the eNB 200.
- the AP discovery notification includes the identifier (SSID / ESSID) of the discovered AP 300.
- the eNB 200 determines whether to connect the UE 100 to the AP 300 (that is, whether to perform offload) based on the AP discovery notification received from the UE 100.
- the eNB 200 may make such a determination in consideration of its own load level, the amount of traffic transmitted or received by the UE 100, or the traffic type. For example, the eNB 200 determines that the UE 100 is connected to the AP 300 when its own load level is high. Also, the eNB 200 determines to connect the UE 100 to the AP 300 when the traffic volume transmitted / received by the UE 100 is large or when the QoS of the traffic transmitted / received by the UE 100 is low.
- the explanation will be made assuming that the eNB 200 determines that the UE 100 is connected to the AP 300.
- step S1109 the eNB 200 transmits request information for requesting the connection of the UE 100 to the AP 300 to the AP 300.
- step S1110 the AP 300 transmits a response (Ack) to the request information from the eNB 200 to the eNB 200.
- Ack a response
- step S1111 the eNB 200 transmits a connection instruction for instructing connection to the AP 300 to the UE 100 in response to receiving the response (Ack) from the AP 300.
- the connection instruction may include information specifying the traffic type that the UE 100 should transmit / receive to / from the AP 300.
- the UE 100 When the UE 100 receives a connection instruction from the eNB 200, the UE 100 connects to the AP 300 and starts WLAN communication with the AP 300.
- the connection instruction includes information specifying the traffic type, the UE 100 transmits and receives the specified traffic type by WLAN communication.
- the UE 100 may notify the eNB 200 to that effect.
- AP300 may notify eNB200 that UE100 connected.
- the UE 100 determines that a timeout has occurred and the WLAN transceiver 112 may be switched to an off state.
- a connection stop instruction for instructing not to connect to the AP 300 may be transmitted from the eNB 200 to the UE 100, and the WLAN transceiver 112 may be switched off when the UE 100 receives the connection stop instruction.
- FIG. 9 is a sequence diagram of the operation pattern 2 according to the first embodiment. Here, differences from the operation pattern 1 will be mainly described.
- steps S1201 to S1204 are the same as in operation pattern 1. However, in the operation pattern 2, in step S1201, the eNB 200 may grasp whether or not the AP 300 is in an off state (sleep state).
- step S1205 the UE 100 sends a proximity notification indicating that the UE 100 has approached the AP 300 to the eNB 200. Send to.
- the proximity notification includes the identifier (SSID / ESSID) of the AP 300 that the UE 100 has detected proximity.
- step S1204 may be performed after step S1205 or after step S1206. Instead of the proximity notification, an AP discovery notification (measurement report) may be used.
- step S1205a when the AP 300 corresponding to the identifier (SSID / ESSID) included in the proximity notification from the UE 100 is in the off state, the eNB 200 activates the AP 300.
- the eNB 200 may transmit a setting request for requesting to set the beacon signal transmission cycle to be short in a certain period.
- the eNB 200 transmits a scan instruction for instructing a WLAN scan to the UE 100.
- the scan instruction includes information specifying the timing and frequency at which the WLAN scan should be performed.
- the timing for performing the WLAN scan is preferably a timing at which the AP 300 broadcasts a beacon signal. Such broadcast timing may be expressed by an offset based on the timing of the eNB 200.
- the UE 100 performs a WLAN scan according to the timing and frequency set by the scan instruction received from the eNB 200.
- the eNB 200 may reset the measurement cycle of the cellular communication to the UE 100 in consideration of the timing at which the AP 300 broadcasts the beacon signal. Such setting is preferably set so that cellular communication measurement is not performed at the WLAN scan timing.
- step S1207 the UE 100 receives a beacon signal from the AP 300.
- step S1208 the UE 100 discovers the AP 300 based on the beacon signal received from the AP 300. Moreover, UE100 extracts the identifier (SSID / ESSID) contained in the beacon signal received from AP300.
- SSID / ESSID the identifier
- the UE 100 transmits a discovery notification (AP discovery notification) indicating that the AP 300 has been discovered to the eNB 200.
- the AP discovery notification includes the identifier (SSID / ESSID) of the discovered AP 300.
- the AP discovery notification may include measurement information (reception power, etc.) regarding the beacon signal from the AP 300.
- the subsequent operations are the same as in operation pattern 1. However, when the eNB 200 requests the AP 300 to set the transmission period of the beacon signal short in a certain period, and when the UE 100 is notified that the AP 300 is connected, the certain period has not expired. In some cases, the AP 300 may be requested to restore the beacon signal transmission cycle.
- the eNB 200 transmits trigger information for scanning the AP 300 to one or a plurality of UEs 100 connected to the eNB 200.
- the eNB 200 may transmit the trigger information when the load level of the eNB 200 is high (exceeds a threshold value).
- the trigger information is information that instructs the WLAN transceiver 112 to be switched on.
- the eNB 200 transmits trigger information to the selected UE 100.
- the UE 100 switches the WLAN transceiver 112 to the on state and performs a WLAN scan.
- the trigger information includes AP position information indicating the position of the AP 300.
- the eNB 200 transmits trigger information to the selected UE 100.
- the UE 100 receives the trigger information and detects proximity to the AP 300 based on the AP position information, the UE 100 switches the WLAN transceiver 112 to the on state and performs a WLAN scan.
- the trigger information includes condition information indicating a condition for performing scanning.
- the eNB 200 transmits trigger information by broadcast.
- the UE 100 receives the trigger information and detects that the condition for performing the WLAN scan is satisfied based on the condition information, the UE 100 switches the WLAN transceiver 112 to the on state and performs the WLAN scan.
- the trigger information may be an offload preference indicator.
- network selection parameters may be used in addition to or instead of the trigger information.
- Other operation patterns will be described in the seventh embodiment and additional notes.
- FIG. 10 is a sequence diagram of an operation pattern 1 according to the second embodiment.
- the UE 100 UE 100-1 to UE 100-N
- the WLAN transceiver 112 is turned off.
- eNB200 and AP300 are performing the negotiation for operating
- step S2102 the eNB 200 transmits request information for requesting the connection of the UE 100 to the AP 300 to the AP 300.
- step S2103 the AP 300 transmits a response (Ack) to the request information from the eNB 200 to the eNB 200.
- the eNB 200 stores the identifier (SSID / ESSID) of the AP 300 from which the response (Ack) is obtained.
- the eNB 200 selects the UE 100 that should be the transmission destination of the trigger information.
- the eNB 200 may make such a determination in consideration of the traffic amount or traffic type transmitted or received by the UE 100, the radio communication environment of the UE 100, or the like. For example, the eNB 200 selects the UE 100 as the transmission destination of the trigger information when the traffic volume transmitted / received by the UE 100 is large or when the QoS of the traffic transmitted / received by the UE 100 is low.
- the eNB 200 may estimate the distance between the UE 100 and the eNB 200 based on path loss or timing advance, and may select the UE 100 that is far away as the transmission destination of the trigger information.
- eNB200 may judge whether UE100 is in a cell edge based on the information of the radio
- the eNB 200 may inquire for each UE 100 whether or not the WLAN is supported. Or eNB200 may grasp
- the capability information notified from the UE 100 to the eNB 200 includes information on whether or not the UE 100 supports WLAN. eNB200 excludes UE100 which does not support WLAN from selection object.
- step S2105 the eNB 200 transmits information (WLAN on instruction) that instructs the selected UE 100 to switch the WLAN transceiver 112 to the on state as trigger information.
- information WLAN on instruction
- step S2106 the UE 100 that has received the trigger information (WLAN ON instruction) switches the WLAN transceiver 112 to the ON state and performs scanning.
- the trigger information WLAN ON instruction
- step S2107 the UE 100 discovers the AP 300 based on the beacon signal received from the AP 300. Moreover, UE100 extracts the identifier (SSID / ESSID) contained in the beacon signal received from AP300.
- SSID / ESSID the identifier
- step S2108 the UE 100 transmits to the eNB 200 an AP discovery notification indicating that the AP 300 has been discovered.
- the AP discovery notification includes the identifier (SSID / ESSID) of the discovered AP 300.
- step S2109 the eNB 200 determines whether to connect the UE 100 to the AP 300 (that is, whether to perform offload) based on the AP discovery notification received from the UE 100.
- the determination method is the same as in the first embodiment. However, in the second embodiment, the eNB 200 determines that the UE 100 that has found the AP 300 for which no response (Ack) is obtained is not connected to the AP 300.
- the eNB 200 transmits a connection instruction for instructing connection to the AP 300 to the UE 100 determined to be connected to the AP 300.
- the connection instruction may include information specifying the traffic type that the UE 100 should transmit / receive to / from the AP 300.
- the UE 100 When the UE 100 receives a connection instruction from the eNB 200, the UE 100 connects to the AP 300 and starts WLAN communication with the AP 300. Furthermore, if the connection instruction includes information specifying the traffic type, the specified traffic type is transmitted / received by WLAN communication.
- step S2111 the eNB 200 determines whether or not the load level distributed (offloaded) to the AP 300 exceeds a threshold value (that is, whether or not the load level of the eNB 200 has been reduced to the target value). If the offloaded load level is less than the threshold, the process returns to step S2104.
- FIG. 11 is a sequence diagram of an operation pattern 2 according to the second embodiment. Here, differences from the operation pattern 1 will be mainly described.
- steps S2201 to S2204 are the same as in operation pattern 1.
- the eNB 200 transmits, as trigger information, information (WLAN on instruction) that instructs the selected UE 100 to switch the WLAN transceiver 112 to the on state.
- the trigger information includes AP position information.
- the UE 100 that has received the trigger information determines whether or not it is close to the AP 300 based on the AP position information and the UE position information included in the WLAN on instruction, for example. Judging. This determination method is the same as in the first embodiment.
- step S2208 the UE 100 that has determined that it is close to the AP 300 switches the WLAN transceiver 112 to the on state and performs a WLAN scan.
- the subsequent operations are the same as those in the operation pattern 1.
- FIG. 12 is a sequence diagram of the operation pattern 3 according to the second embodiment. Here, differences from the operation pattern 1 will be mainly described.
- steps S2301 to S2303 are the same as those in the operation pattern 1.
- the eNB 200 determines a condition (scan execution condition) for performing the WLAN scan.
- the scan execution condition is a condition that, for example, WLAN is supported.
- the scan execution condition may be determined by an operator policy.
- step S2305 the eNB 200 broadcasts trigger information including a scan execution condition to each UE 100 connected to the eNB 200. That is, such trigger information can be regarded as a conditional WLAN on instruction.
- step S2307 the UE100 which received trigger information judges whether scan execution conditions are satisfied performs a WLAN scan by switching the WLAN transceiver 112 to the on state.
- the subsequent operations are the same as those in the operation pattern 1.
- the UE 100 may determine whether to use the information received from the eNB 200. For example, when it is estimated that the UE 100 is moving at a high speed from the number of handovers per unit time, location information, and the like and it is estimated that the UE 100 is out of the coverage of the eNB 200, the information received from the eNB 200 is not used.
- the UE 100 may determine whether to use the information received from the eNB 200 in consideration of the traffic amount or traffic type transmitted / received by itself or the wireless communication environment of the UE 100. For example, the UE 100 uses information received from the eNB 200 when the amount of traffic transmitted / received by the UE 100 is large or when the QoS of the traffic transmitted / received by the UE 100 is low. In other cases, the information received from the eNB 200 is not used.
- the AP 300 according to the third embodiment is configured to be able to transmit a discovery signal (beacon signal) within the cellular frequency band.
- FIG. 13 is a block diagram of an AP 300 according to the third embodiment. As shown in FIG. 13, the AP 300 includes a cellular transceiver 312 in addition to the WLAN transceiver 311. Other configurations are the same as those of the first embodiment.
- HeNB400 (refer FIG. 7) which manages a small cell is comprised so that a signal for a discovery can be transmitted with the frequency (1st frequency) to which a macrocell belongs.
- the discovery signal transmitted by the HeNB 400 may be a kind of cell-specific reference signal (CRS), or may be a signal transmitted at a higher density and longer period than a normal CRS.
- FIG. 14 is a block diagram of the HeNB 400 according to the third embodiment. As illustrated in FIG.
- the HeNB 400 includes a cellular transceiver 412 for a macro cell band (first frequency) in addition to a cellular transceiver 411 for a small cell band (second frequency).
- a cellular transceiver 412 for a macro cell band (first frequency) in addition to a cellular transceiver 411 for a small cell band (second frequency).
- Other configurations are the same as those of the eNB 200.
- the AP 300 and the HeNB 400 are appropriately referred to as “specific devices”.
- the specific device broadcasts a discovery signal for notifying the presence of the specific device within the cellular frequency band and in a specific period.
- the UE 100 connected to the eNB 200 scans the discovery signal by the cellular transceiver 111 within the cellular frequency band and in a specific period.
- the specific period is configured in units of subframes, but may be configured in other time units (slots, symbols, and the like).
- the AP 300 performs WLAN communication in a WLAN frequency band different from the cellular frequency band, but broadcasts a discovery signal (beacon signal) in the cellular frequency band. Further, the HeNB 400 performs cellular communication in the small cell band, but broadcasts a discovery signal in the macro cell band.
- the UE 100 connected to the eNB 200 can receive the discovery signal from the specific device (AP 300, HeNB 400) while being connected to the eNB 200, the specific device can be easily found while being connected to the eNB 200. As a result, the UE 100 can be connected to the specific device.
- the specific device may stop broadcasting the discovery signal when its own load level is high.
- the UE 100 may store information on specific subframes (such as subframe numbers) in advance, or the eNB 200 may notify the UE100.
- the eNB 200 may cause the UE 100 to recognize the specific subframe as a subframe for MBMS (Multimedia Broadcast Multicast Service).
- MBMS Multimedia Broadcast Multicast Service
- the specific device needs to be synchronized with the eNB 200 in the case of being asynchronous. Since the specific device has a function of performing communication in the macro cell frequency band, it is possible to detect the downlink subframe timing of the eNB 200 by accessing the eNB 200 as the UE 100. In this case, the specific device may detect the downlink subframe timing of the eNB 200 based on the timing advance assigned from the eNB 200.
- the eNB 200 stops the transmission of the UE 100 and / or the UE 100 connected to the UE 100 in a specific subframe so that the UE 100 can easily receive the discovery signal.
- FIG. 16 is a sequence diagram of an operation pattern 1 according to the third embodiment.
- the UE 100 is connected to the eNB 200, and the WLAN transceiver 112 is in the off state.
- eNB200 and AP300 are performing the negotiation for operating
- the AP 300 broadcasts a discovery signal within the cellular frequency band and in a specific subframe.
- the discovery signal includes an identifier (SSID / ESSID) of the AP 300.
- the UE 100 connected to the eNB 200 scans the discovery signal in the cellular frequency band and in a specific subframe.
- step S3103 the UE 100 detects a discovery signal from the AP 300 by scanning (that is, discovers the AP 300). Moreover, UE100 extracts the identifier (SSID / ESSID) contained in the detected signal for discovery.
- a discovery signal from the AP 300 by scanning (that is, discovers the AP 300).
- UE100 extracts the identifier (SSID / ESSID) contained in the detected signal for discovery.
- step S3104 the UE 100 transmits an AP discovery notification indicating that the AP 300 has been discovered to the eNB 200.
- the AP discovery notification includes the identifier (SSID / ESSID) of the discovered AP 300.
- step S3105 the eNB 200 determines whether to connect the UE 100 to the AP 300 (that is, whether to perform offloading) based on the AP discovery notification received from the UE 100.
- This determination method is the same as in the first embodiment.
- the explanation will be made assuming that the eNB 200 determines that the UE 100 is connected to the AP 300.
- the eNB 200 transmits a connection instruction for instructing connection to the AP 300 to the UE 100.
- the connection instruction may include information specifying the traffic type that the UE 100 should transmit / receive to / from the AP 300.
- the connection instruction can be regarded as a WLAN scan instruction.
- step S3107 in response to receiving the connection instruction from the eNB 200, the UE 100 switches the WLAN transceiver 112 to the on state and starts a WLAN scan in the WLAN frequency band.
- step S3108 if the AP 300 is not found by scanning in the WLAN frequency band, the UE 100 determines that the WLAN transceiver 311 of the AP 300 is in an off state (sleep state), and transmits a WLAN on request to the eNB 200 (step S3109). ). And in step S3110, eNB200 transmits a starting instruction
- step S3112 the UE 100 detects a beacon signal from the AP 300 by scanning in the WLAN frequency band (that is, discovers the AP 300).
- step S3114 the UE 100 connects to the AP 300 and starts WLAN communication with the AP 300. If the connection instruction includes information specifying the traffic type, the specified traffic type is transmitted / received by WLAN communication.
- the UE 100 may notify the eNB 200 to that effect.
- AP300 may notify eNB200 that UE100 connected.
- FIG. 17 is a sequence diagram of an operation pattern 2 according to the third embodiment. Here, differences from the operation pattern 1 will be mainly described.
- step S3212 is performed after the UE 100 discovers the AP 300 in the WLAN frequency band (step S3209).
- the UE 100 transmits an AP discovery notification indicating that the AP 300 has been discovered in the WLAN frequency band to the eNB 200.
- the AP discovery notification includes the identifier (SSID / ESSID) of the discovered AP 300.
- step S3212 the eNB 200 determines whether to connect the UE 100 to the AP 300 (that is, whether to perform offload) based on the AP discovery notification received from the UE 100.
- the explanation will be made assuming that the eNB 200 determines that the UE 100 is connected to the AP 300.
- the eNB 200 transmits a connection instruction for instructing connection to the AP 300 to the UE 100.
- the connection instruction may include information specifying the traffic type that the UE 100 should transmit / receive to / from the AP 300.
- step S3214 the UE 100 connects to the AP 300 in response to a connection instruction from the eNB 200, and starts WLAN communication with the AP 300. Furthermore, if the connection instruction includes information specifying the traffic type, the specified traffic type is transmitted / received by WLAN communication.
- the specific device is the HeNB 400 (small cell)
- a procedure similar to the operation pattern 1 may be applied, or a procedure similar to the operation pattern 2 may be applied.
- FIG. 18 shows a state in which a plurality of HeNBs 400 simultaneously transmit discovery signals in the same subframe.
- FIG. 19 shows a state in which a plurality of HeNBs 400 are grouped in a specific group unit, and discovery signals are transmitted in different subframes for each group.
- each HeNB 400 transmits a discovery signal in the frequency band (macro cell frequency band) of the eNB 200.
- the frequency band that HeNB 400 actually uses for communication is not the same, and UE 100 does not necessarily support all frequency bands. Therefore, even if the UE 100 detects a discovery signal from the HeNB 400 in the macro cell frequency band, if the UE 100 does not support the frequency band of the HeNB 400, the UE 100 cannot connect to the HeNB 400.
- the HeNB 400 is grouped by frequency band, and discovery signals are transmitted in different subframes for each group. Further, the UE 100 scans the discovery signal only in the subframe corresponding to the frequency band supported by the UE 100. In this way, the UE 100 can discover only the connectable HeNB 400.
- the AP 300 and the HeNB 400 are illustrated as specific devices, but the specific device may be a UE that supports inter-terminal wireless communication.
- the terminal-to-terminal wireless communication is referred to as D2D (Device to Device) communication.
- D2D communication a plurality of UEs communicate directly without going through the EPC 20.
- the UE that performs D2D communication within the cellular frequency band can be positioned similarly to the HeNB 400.
- the UE that performs D2D communication outside the cellular frequency band can be positioned similarly to the AP 300.
- the specific devices may be grouped, and discovery signals may be transmitted in different subframes for each group.
- the specific device may be a cellular base station that performs communication in an unlicensed band.
- the AP 300 transmits a beacon signal as a discovery signal within the cellular frequency band.
- the AP 300 transmits a normal cellular reference signal (for example, CRS) within the cellular frequency band, instead of transmitting a beacon signal within the cellular frequency band.
- CRS normal cellular reference signal
- a cell identifier that identifies the AP 300 is assigned to the AP 300. That is, the AP 300 belongs to the WLAN system, but is assigned a cell identifier used in the cellular communication system (LTE system).
- eNB200 memorize
- FIG. 20 is a sequence diagram according to the fourth embodiment.
- the UE 100 is connected to the eNB 200 and the WLAN transceiver 112 is turned off.
- eNB200 and AP300 are performing the negotiation for operating
- the AP 300 broadcasts a cellular reference signal within the cellular frequency band.
- the cellular reference signal transmitted by the AP 300 includes a cell identifier assigned to the AP 300.
- the UE 100 connected to the eNB 200 receives the cellular reference signal broadcast from the AP 300 within the cellular frequency band.
- measurement of the cellular reference signal for example, measurement of received power
- the measurement information includes the cell identifier of the measurement target cell.
- step S4105 the eNB 200 determines whether the UE 100 has received the cellular reference signal from the AP 300 based on the measurement information reported from the UE 100. For example, when the eNB 200 confirms that the cell identifier included in the measurement information matches the cell identifier assigned to the AP 300, the eNB 200 determines that the UE 100 has received the cellular reference signal from the AP 300.
- step S4106 the eNB 200 determines whether to connect the UE 100 to the AP 300 (that is, whether to perform offload). This determination method is the same as in the first embodiment.
- the subsequent operation is the same as the operation pattern 1 according to the third embodiment.
- a cellular base station that performs communication in an unlicensed band may be used instead of the AP 300.
- the AP 300 detects that the UE 100 has approached the AP 300 by detecting a cellular uplink signal transmitted by the UE 100 connected to the eNB 200.
- the AP 300 transmits a notification indicating that the UE 100 has approached the AP 300 to the eNB 200 based on the detection of the cellular uplink signal.
- eNB200 transmits the information for scanning AP300 to UE100 based on the notification from AP300.
- the AP 300 acquires signal information related to the cellular uplink signal transmitted by the UE 100 from the eNB 200, and estimates a path loss between the UE 100 and the AP 300 based on the signal information. To do. The AP 300 determines that the UE 100 is close to the AP 300 when the path loss is less than the threshold.
- the AP 300 determines whether or not the UE 100 is close to the AP 300 based on the distance between the AP 300 and the eNB 200 and the reception power of the cellular uplink signal.
- FIG. 21 is a sequence diagram of operation pattern 1 according to the fifth embodiment.
- the UE 100 is connected to the eNB 200, and the WLAN transceiver 112 is in an off state.
- eNB200 and AP300 are performing the negotiation for operating
- step S5102 the AP 300 transmits a beacon signal.
- the UE 100 transmits a cellular uplink signal to the eNB 200.
- the cellular uplink signal may be, for example, an uplink reference signal (SRS: Sounding Reference Signal).
- step S5104 the AP 300 receives the cellular uplink signal from the UE 100 and detects the presence of the UE 100. In addition, the AP 300 measures the received power of the cellular uplink signal from the UE 100 and specifies a resource element corresponding to the cellular uplink signal.
- step S5105 the AP 300 transmits information on the identified resource element to the eNB 200.
- the AP 300 may also transmit information on the measured uplink received power to the eNB 200.
- step S5106 the eNB 200 identifies the UE 100 to which the resource element is assigned based on the resource element information received from the AP 300. In the fifth embodiment, it is assumed that the eNB 200 stores information on allocation history.
- step S5107 the eNB 200 specifies the SRS setting information and the uplink transmission power for the specified UE 100.
- step S5108 the eNB 200 transmits the specified SRS setting information and uplink transmission power information to the AP 300.
- step S5109 the AP 300 estimates a path loss between the UE 100 and the AP 300 based on the SRS setting information and the uplink transmission power received from the eNB 200.
- the path loss is obtained by subtracting “reception power of AP 300 (reception power measured in step S5104)” from “transmission power of UE 100 (uplink transmission power obtained in step S5108)”.
- step S5110 the AP 300 compares the estimated path loss with a threshold value to check whether the path loss is less than the threshold value.
- a threshold value For the description will be made assuming that the path loss is less than the threshold.
- step S5111 the AP 300 transmits a notification indicating that the UE 100 has approached the AP 300 to the eNB 200.
- step S5112 the eNB 200 determines whether to connect the UE 100 to the AP 300.
- This determination method is the same as in the first embodiment. Here, the description will be made assuming that it is determined that the UE 100 is connected to the AP 300.
- step S5113 the eNB 200 transmits a connection instruction (scan instruction) to the AP 300 to the UE 100.
- the connection instruction includes the identifier (SSID / ESSID) of the AP 300.
- step S5114 in response to receiving the connection instruction, the UE 100 switches the WLAN transceiver 112 to the on state and performs scanning.
- step S5115 the UE 100 discovers the AP 300 by scanning.
- step S5116 the UE 100 connects to the AP 300.
- FIG. 22 is a sequence diagram of an operation pattern 2 according to the fifth embodiment. Here, differences from the operation pattern 1 will be mainly described.
- the operation pattern 2 is different from the operation pattern 1 in the proximity detection method in the AP 300.
- steps S5201 to S5203 are the same as in operation pattern 1.
- step S5204 the AP 300 transmits to the eNB 200 a notification indicating that the cellular uplink signal from the UE 100 has been received.
- step S5205 the eNB 200 determines whether or not to connect the UE 100 to the AP 300.
- the eNB 200 determines only a rough determination, for example, the necessity of offloading.
- the description will be made assuming that the eNB 200 determines that the UE 100 is connected to the AP 300.
- step S5206 the eNB 200 transmits information (transmission power, transmission timing, preamble, etc.) regarding the physical random access channel (PRACH) allocated to the UE 100 to the AP 300.
- information transmission power, transmission timing, preamble, etc.
- step S5207 the eNB 200 instructs the UE 100 to transmit the preamble on the PRACH (the preamble notified to the AP 300 in step S5206).
- step S5208 the UE 100 transmits a preamble on the PRACH according to the instruction from the eNB 200.
- step S5209 the AP 300 detects the preamble from the UE 100 based on the information from the eNB 200, and measures the received power.
- step S5210 the AP 300 estimates a path loss between the UE 100 and the AP 300 based on the detected preamble.
- the path loss is obtained by subtracting “reception power of AP 300 (reception power measured in step S5209)” from “transmission power of UE 100 (transmission power obtained in step S5206)”.
- the AP 300 determines whether or not the UE 100 is close to the AP 300 without acquiring information from the eNB 200 after detecting the cellular uplink signal from the UE 100. Specifically, after confirming that the AP 300 is provided far away from the eNB 200, the AP 300 determines that the UE 100 is close to the AP 300 when the received power of the cellular uplink signal from the UE 100 is high.
- a cellular base station that performs communication in an unlicensed band may be used instead of the AP 300.
- the UE 100 is connected to the AP 300 as much as possible.
- the fifth embodiment prevents the UE 100 from being connected to the AP 300 as much as possible under a specific situation. Specifically, as illustrated in FIG. 7, since the coverage of the AP 300 is narrow, the UE 100 that moves at high speed immediately passes through the coverage of the AP 300. Therefore, it is efficient that the UE 100 moving at high speed does not perform the WLAN scan.
- the UE 100 connected to the eNB 200 derives its own moving speed, and if the moving speed exceeds the threshold, the UE 100 performs the WLAN scan even if the WLAN transceiver 112 is on. To stop.
- FIG. 23 is a sequence diagram according to the sixth embodiment.
- the UE 100 is connected to the eNB 200 and the WLAN transceiver 112 is in an off state.
- step S6101 the UE 100 switches the WLAN transceiver 112 to an on state and starts a WLAN scan.
- step S6102 the UE 100 derives (calculates) its own moving speed.
- the moving speed of the UE 100 can be derived from UE position information obtained by GNSS, for example. And UE100 judges whether own moving speed exceeds a threshold value.
- the description is advanced on the assumption that the UE 100 determines that the moving speed of the UE 100 exceeds the threshold.
- step S6103 the UE 100 stops the WLAN scan.
- step S6104 the UE 100 derives (calculates) its moving speed. And UE100 judges whether own moving speed exceeds a threshold value.
- a threshold value the description will be made on the assumption that the UE 100 has determined that the moving speed of the UE 100 is equal to or less than the threshold. In this case, the UE 100 resumes the WLAN scan.
- step S6105 the UE 100 receives a beacon signal from the AP 300.
- step S6106 the UE 100 detects a beacon signal from the AP 300 by scanning (that is, discovers the AP 300).
- connection restriction to the AP 300 is performed using the moving speed of the UE 100 as a determination criterion, but other determination criteria may be used.
- the connection restriction to the AP 300 may be performed using the traffic type as a criterion. In this case, interruption of communication due to switching of connection to the AP 300 can be prevented.
- connection restriction to the AP 300 is performed under a specific situation.
- connection restriction to the AP 300 is performed by the eNB 200.
- ENB200 which concerns on 7th Embodiment transmits the control information which controls whether UE100 performs a WLAN scan with respect to UE100 connected to eNB200.
- the eNB 200 transmits control information instructing to perform scanning when a condition for performing scanning is satisfied, and performs scanning when the condition is not satisfied. Control information instructing to stop is transmitted.
- the eNB 200 includes, in the control information, condition information indicating a condition for performing a scan or a condition for stopping a scan. In this case, the UE 100 determines whether or not to stop scanning based on the condition information.
- FIG. 24 is a sequence diagram of operation pattern 1 according to the seventh embodiment.
- the UE 100 is connected to the eNB 200, and the WLAN transceiver 112 is turned off.
- step S7101 the UE 100 switches the WLAN transceiver 112 to an on state and starts a WLAN scan.
- step S7102 the eNB 200 derives (calculates) the moving speed of the UE 100.
- the moving speed of the UE 100 for example, UE moving speed information (number of handovers per unit time) managed by the EPC 20 can be used.
- eNB200 judges whether the moving speed of UE100 exceeds a threshold value.
- the description will be made assuming that the eNB 200 determines that the moving speed of the UE 100 exceeds the threshold.
- step S7103 the eNB 200 transmits control information instructing to stop scanning to the UE 100.
- step S7104 the UE 100 stops the WLAN scan according to the control information from the eNB 200.
- step S7105 the eNB 200 derives (calculates) the moving speed of the UE 100. And eNB200 judges whether the moving speed of UE100 exceeds a threshold value.
- a threshold value the description will be made assuming that the eNB 200 determines that the moving speed of the UE 100 is equal to or less than the threshold.
- step S7106 the eNB 200 transmits control information instructing to perform scanning to the UE 100.
- the UE 100 resumes the WLAN scan according to the control information from the eNB 200.
- step S7107 the UE 100 receives a beacon signal from the AP 300.
- step S7108 the UE 100 detects a beacon signal from the AP 300 by scanning (that is, discovers the AP 300).
- connection restriction to the AP 300 is performed using the moving speed of the UE 100 as a determination criterion, but other determination criteria may be used. For example, when the UE 100 starts transmission / reception of a specific traffic type (for example, traffic with high QoS) using the traffic type as a criterion, connection restriction to the AP 300 may be performed. Alternatively, when the load level of the eNB 200 is low using the load level of the eNB 200 as a criterion, connection restriction to the AP 300 may be performed. Alternatively, when the wireless quality between the UE 100 and the eNB 200 is used as a determination criterion, the connection restriction to the AP 300 may be performed when the wireless quality is high.
- a specific traffic type for example, traffic with high QoS
- FIG. 25 is a sequence diagram of operation pattern 2 according to the seventh embodiment. Here, differences from the operation pattern 1 will be mainly described.
- step S7201 the eNB 200 transmits, to the UE 100, control information including condition information indicating a condition for performing scanning or a condition for stopping scanning.
- condition information indicating a condition for performing scanning or a condition for stopping scanning.
- the criterion specified by the condition information is UE moving speed, traffic type, radio quality, or the like.
- step S7202 the UE 100 determines whether or not the condition indicated by the condition information is satisfied.
- the description will be made on the assumption that the condition for scanning is not satisfied (or the condition for stopping scanning is satisfied).
- step S7203 the UE 100 stops the WLAN scan.
- step S7204 the UE 100 determines whether or not the condition indicated by the condition information is satisfied.
- the description will be made on the assumption that the condition for scanning is satisfied (or the condition for stopping scanning is not satisfied).
- step S7205 the UE 100 switches the WLAN transceiver 112 to an on state and starts a WLAN scan.
- step S7206 the UE 100 receives a beacon signal from the AP 300.
- step S7207 the UE 100 detects a beacon signal from the AP 300 by scanning (that is, discovers the AP 300).
- the eighth embodiment will be described mainly with respect to differences from the above-described first to seventh embodiments.
- the system configuration and operating environment according to the eighth embodiment are the same as those of the first embodiment.
- the 8th Embodiment is embodiment which switches the connection destination of UE100 from AP300 to eNB200.
- the UE 100 when switching the connection destination from the AP 300 to the eNB 200, transmits notification information indicating that the AP 300 is switched to the eNB 200 to the eNB 200.
- the notification information includes an identifier (SSID / ESSID) for identifying the AP 300 and / or an identifier for identifying the UE 100.
- the eNB 200 transmits, to the AP 300, request information requesting to transfer transmission data addressed to the UE 100 to the eNB 200.
- FIG. 26 is a sequence diagram of operation pattern 1 according to the eighth embodiment.
- the UE 100 connected to the AP 300 is switched from the AP 300 to the eNB 200 under a situation where the UE 100 is predicted to move out of the coverage of the AP 300.
- the UE 100 is connected to the AP 300 (step S8101).
- eNB200 and AP300 are performing the negotiation for operating
- the UE 100 derives (calculates) its own moving speed.
- the moving speed of the UE 100 can be derived from UE position information obtained by GNSS, for example. And UE100 judges whether own moving speed exceeds a threshold value.
- a threshold value the description will be made on the assumption that the UE 100 has determined that the moving speed of the UE 100 is equal to or less than the threshold.
- step S8104 the UE 100 does not switch from the AP 300 to the eNB 200.
- step S8105 the UE 100 derives (calculates) its moving speed. And UE100 judges whether own moving speed exceeds a threshold value.
- the description is advanced on the assumption that the UE 100 determines that the moving speed of the UE 100 exceeds the threshold.
- step S8106 switching from the AP 300 to the eNB 200 is determined.
- the UE 100 performs a random access procedure and an RRC connection establishment procedure with the eNB 200.
- the UE 100 transmits notification information (Out-bound info.) Indicating that switching from the AP 300 to the eNB 200 is performed to the eNB 200.
- step S8110 the eNB 200 transmits, to the AP 300, request information requesting to transfer transmission data addressed to the UE 100 to the eNB 200 based on the notification information received from the UE 100.
- step S8111 the AP 300 transfers transmission data addressed to the UE 100 to the eNB 200 according to the request information received from the eNB 200.
- eNB200 transmits the transmission data received from AP300 to UE100. As a result, switching from the AP 300 to the eNB 200 can be performed seamlessly.
- the switching determination from the AP 300 to the eNB 200 is performed based on the moving speed of the UE 100 as a determination criterion, but other determination criteria may be used. For example, with the received power (RSSI) of the WLAN signal received by the UE 100 from the AP 300 as a criterion, the switching from the AP 300 to the eNB 200 may be determined when the RSSI falls below a threshold value.
- RSSI received power
- FIG. 27 is a sequence diagram of operation pattern 2 according to the eighth embodiment.
- the connection destination of the UE 100 is switched from the AP 300 to the eNB 200 under a situation where the load level of the AP 300 is high.
- differences from the operation pattern 1 will be mainly described.
- the AP 300 determines whether to switch the connection destination of the UE 100 from the AP 300 to the eNB 200 based on its own load level. For example, the AP 300 determines to switch the connection destination of the UE 100 from the AP 300 to the eNB 200 when its own load level exceeds a threshold value.
- a threshold value For example, description will be made on the assumption that the AP 300 determines to switch the connection destination of the UE 100 from the AP 300 to the eNB 200.
- step S8203 the AP 300 transmits a switching instruction from the AP 300 to the eNB 200 to the UE 100.
- the subsequent processing is the same as that of the operation pattern 1.
- the switching determination from the AP 300 to the eNB 200 is performed using the load level of the AP 300 as a determination criterion, but other determination criteria may be used.
- the moving speed of the UE 100 may be used as the determination criterion.
- a cellular base station that performs communication in an unlicensed band may be used instead of the AP 300.
- the ninth embodiment is an embodiment for switching the connection destination of the UE 100 from the AP 300 to the eNB 200, as in the eighth embodiment.
- the AP 300 transmits request information for requesting switching to the eNB 200 to the eNB 200.
- AP300 transmits the instruction information which instruct
- FIG. 28 is a sequence diagram according to the ninth embodiment.
- the UE 100 is connected to the AP 300.
- eNB200 and AP300 are performing the negotiation for operating
- the AP 300 confirms that the AP 300 is provided within the coverage of the eNB 200.
- step S9102 the AP 300 determines whether to switch the connection destination of the UE 100 from the AP 300 to the eNB 200 based on its own load level.
- the AP 300 is provided in the coverage of the eNB 200, and it is guaranteed that the UE 100 connected to the AP 300 has a radio quality with the eNB 200 of a predetermined level or higher. Therefore, the AP 300 can determine to switch the connection destination of the UE 100 to the eNB 200 without receiving a measurement report for the eNB 200 from the UE 100.
- the description will proceed assuming that the AP 300 has decided to switch the connection destination of the UE 100 from the AP 300 to the eNB 200.
- step S9103 the AP 300 transmits request information for requesting switching to the eNB 200 to the eNB 200.
- step S9104 the eNB 200 transmits information (contention-free preamble, etc.) used for the connection procedure to the eNB 200 to the AP 300 together with a response (Ack) to the request information from the AP 300.
- information contention-free preamble, etc.
- step S9105 the AP 300 transmits a switching instruction from the AP 300 to the eNB 200 to the UE 100 in response to receiving the response (Ack) from the eNB 200.
- the switching instruction includes information used for the connection procedure to the eNB 200.
- step S9106 the AP 300 transmits a switching instruction to the UE 100 and transfers transmission data addressed to the UE 100 to the eNB 200.
- steps S9107 to S9109 the UE 100 performs a connection process with the eNB 200.
- a cellular base station that performs communication in an unlicensed band may be used instead of the AP 300.
- the eNB 200 and the AP 300 are separate devices
- the eNB 200 may have the function of the AP 300. That is, eNB200 may have a WLAN transceiver.
- HeNB400 may have the function of AP300.
- the secret communication between the UE 100 and the AP 300 is not particularly considered, but such secret communication may be considered.
- the eNB 200 inquires of the UE 100 about the presence or absence of connection setting information used for the secret communication with the AP 300 for the UE 100 determined to be connected to the AP 300. When the user terminal does not have such connection setting information, the eNB 200 requests the connection target AP 300 to issue temporary connection setting information. And the temporary connection setting information which AP300 issued according to the request
- the eNB 200 transmits, to the UE 100, WLAN connection setting confirmation information for inquiring whether or not there is a connection setting (secret setting) with the connection target AP 300.
- the WLAN connection setting confirmation information includes the identifier (SSID / ESSID) of the AP 300 to be connected.
- the UE 100 returns a WLAN connection setting response indicating the presence / absence of connection setting for the inquiry AP 300 to the eNB 200.
- the WLAN connection setting response includes the identifier (SSID / ESSID) of the AP 300 to be connected.
- the eNB 200 transmits issuance request information for requesting issuance of a temporary connection setting to the AP 300 to be connected when there is no connection setting in the WLAN connection setting response.
- the issue request information includes the WLAN MAC-ID of the UE 100.
- the AP 300 generates temporary connection setting information for the issue request information from the eNB 200 and notifies the eNB 200 of the temporary connection setting information.
- the temporary connection setting information includes information on the secret setting (secret type, secret key).
- eNB200 adds the identifier (SSID / ESSID) of AP300 to the temporary connection setting information from AP300, and transfers to UE100.
- the eNB 200 may include temporary connection setting information in the scan instruction described above.
- the availability of the WLAN service of the UE 100 is not particularly considered, but the availability of the WLAN service may be considered.
- the eNB 200 inquires of the service management server whether or not the UE 100 connected to the own cell is registered in a service that can use the AP 300. When the UE 100 is not registered in the service, the eNB 200 may transmit authentication information for registering in the service from the eNB 200 to the UE 100. The detailed procedure will be described below.
- the eNB 200 transmits service registration confirmation information for inquiring whether or not there is service registration to the WLAN network to the service management server.
- the service registration confirmation information includes the UE 100 identifier (for example, MAC-ID).
- the service management server returns service registration information indicating the registration status to the WLAN service to the eNB 200.
- the service registration information includes an identifier (for example, MAC-ID) of the UE 100.
- the eNB 200 transmits a scan instruction (WLAN connection request) to the UE 100 when there is a service contract in the service registration information from the service management server. On the other hand, when there is no service contract, the eNB 200 does not transmit a scan instruction to the UE 100. Or eNB200 determines provision of temporary service, and transmits the authentication information for temporary login settings for a service, ie, a service authentication key (authentication ID, password), to UE100.
- a service authentication key authentication ID, password
- the LTE system has been described as an example of the cellular communication system.
- the embodiment is not limited to the LTE system, and a cellular communication system other than the LTE system may be used.
- the white list is described as a list of connectable APs 300 (Planned APs), information on a list of APs 300 (black lists) that should not be connected may be added thereto.
- Appendix 1 One of the main objectives of 3GPP / WLAN interworking considerations is to extend the interworking between 3GPP and WLAN beyond the integration currently supported at the CN level. Further improvements at the RAN level are needed to improve the overall user experience. As a result, it is possible to improve the use of the network, reduce unnecessary power consumption of the UE, and move seamlessly between the two networks. Appendix 1 examines some scenarios necessary to achieve these objectives.
- the initial phase of this consideration should recognize the RAN level interworking requirements and clarify the scenarios to be considered here, taking into account existing standards. It is.
- the scenarios discussed below include improvements to the current system and require further analysis of appropriate UE behavior.
- WLAN AP can be installed in various places.
- WLANs may be installed in places where 3GPP access networks are not available.
- 3GPP / WLAN interworking should focus on scenarios where the WLAN is overlaid on the 3GPP system, regardless of whether the WLAN AP is co-located with any of the 3GPP nodes. It is.
- 3GPP / WLAN interworking can only be applied to offload to WLANs that are located within the coverage of the 3GPP system.
- An efficient WLAN discovery mechanism does not assume that the UE always has its WLAN client powered on. Therefore, the selection of a UE for offloading to a WLAN needs to be carefully considered for each WLAN discovery mechanism. Furthermore, the selection of candidate UEs for offloading to the WLAN should not be made based on the relative proximity to the WLAN AP, but based on the suitability of services suitable for the WLAN due to backhaul latency. Should be done.
- Proposal 1 In order to improve UE energy consumption, efficient means for WLAN ⁇ AP discovery must be considered.
- a service suitable for offloading must be considered.
- the latency-allowed service seems to be an ideal candidate for offloading. Therefore, RAN2 must consider UE connectivity based on active services.
- the UE behavior for both inbound mobility to the WLAN and outbound mobility from the WLAN must be considered. Inbound mobility for a WLAN is required if the 3GPP network determines that one or more UE active services should be offloaded to the WLAN.
- the UE's active services are offloaded to the WLAN, but the UE is assumed to remain idle (IDLE) on 3GPP systems, for example, to receive incoming pages (incoming calls) . If the UE activates a new service that is not suitable for the WLAN, the procedures necessary for outbound mobility from the WLAN to the 3GPP system must be considered. In addition, it should be considered whether all services need to be transferred from the WLAN to the 3GPP system, or whether only services that are not applicable to the WLAN should be transferred to the 3GPP system. There must be. If the UE needs to connect to both systems at the same time, the power consumption of the UE must also be considered.
- Proposal 2 In order to provide highly reliable mobility, UE behavior for inbound mobility to WLAN and outbound mobility from WLAN must be considered.
- Appendix 1 mentioned several scenarios that must be resolved in this consideration.
- Solution 2 is a scheme in which a parameter for network selection can be provided from the RAN to the UE, and the UE has the right to select a network in accordance with a network selection rule (policy). Further details on meeting the requirements of Solution 2 are described in the Appendix.
- Policy network selection rule
- the RAN should be able to provide rules that ensure uniform behavior between UEs. Providing a static rule to the UE in advance would basically result in unpredictable behavior as it is a UE implementation issue. This flexibility is one of the main advantages of Solution 2.
- RAN has the option of notifying the preferred rules used by the UE even if the ANDSF policy is provided to the UE.
- ANDSF is available to the UE and the UE supports ANDSF
- the UE should be allowed to use ANDSF.
- it is up to the RAN to decide which rule to use. If the RAN knows that the UE has an ANDSF available, the RAN should allow the UE to use the ANDSF. If the RAN informs the UE that it should use RAN rules, the use of ANDSF will be left to the UE implementation that prevents uniform behavior among all UEs if the UE grants permission to use ANDSF.
- the RAN rule or the ANDSF policy is used according to the RAN decision, not both.
- RAN rules should be provided to all UEs without distinction.
- the RAN it is up to the RAN to decide whether to use RAN rules or ANDSF. If the UE performs traffic steering based on the rules provided by the RAN, the behavior of the roaming UE will be predictable to the operator. It is also preferable for load balance.
- the UE does not automatically scan the WLAN and does not direct traffic to the WLAN.
- the RAN rule assumes that the UE is also responsible for the charge level condition as part of the WLAN scan optimization. Details of WLAN scan optimization need further study.
- traffic steering from the RAN to the WLAN the UE selects the traffic whose direction is to be switched based on the DRB defined by the RAN rule.
- the UE may use IFOM, or use the UE implementation, if available.
- Table 1 summarizes the relationship between RAN rules and ANDSF (applicable policy / rule outline).
- the RAN determines whether the UE uses RAN rules or ANDSF policies.
- Proposal 1 If the RAN determines that the UE should use RAN rules, the UE uses only RAN rules, even if ANDSF is available.
- Proposal 2 If the RAN determines that the UE should use RAN rules, traffic steering from the RAN to the WLAN follows the traffic information that defines the data bearer selected for offload.
- Proposal 3 In traffic steering from WLAN to RAN, UE may select traffic according to UE implementation or IFOM (if available).
- Solution 2 lets the RAN adjust the 3GPP RAN RSRP, RSCP, WLAN BSS load, and WLAN RSSI thresholds to change the desired offload level.
- the accuracy of access network selection is improved by using direct metrics rather than indirect metrics such as load information.
- Solution 2 can prevent traffic steering using inefficient scanning and offload notification.
- the RAN recommends network selection by sending an offload notification to the UE.
- the UE starts network selection triggered by this notification.
- offload notifications prevents unnecessary scanning of the WLAN, especially when the user turns off the UE's WLAN module to save power.
- the UE turns on the power of the WLAN module.
- Proposal 4 In Solution 2, the RAN may send an offload notification that tells the UE the intention to offload from the RAN to the WLAN.
- Proposal 5 Even if the UE receives an offload notification from the RAN, the UE has the option of determining whether a WLAN scan is preferred based on the UE implementation, eg, battery level.
- FIG. 29 shows a case where traffic steering need not be executed.
- the right side of FIG. 29 shows a case where the UE starts network selection using offload notification.
- Solution 2 achieves an appropriate balance between RAN load and WLAN load AP by utilizing ANDSF or RAN rules.
- the RAN rules define thresholds for 3GPP / WLAN signals and WLAN loads and control traffic steering without explicitly providing RAN load information. Even if the UE can use ANDSF, the RAN determines whether the ANDSF or RAN rules are used so as not to potentially conflict between the two.
- the policy used by the UE may be different, so the offload results may still be uncertain.
- the UE behavior can be predicted, and as a result, predictable offload control is possible.
- Solution 2 has the advantage that the RAN can control the timing for assigning rules that enable more accurate offload control.
- the RAN has the option of adjusting the thresholds necessary to make the access network selectable in a timely manner.
- Necessary requirement 2 By defining rules that reflect RAN / WLAN signal quality and WLAN load, the user experience may be improved. To improve both user experience and network performance, the RAN defines thresholds and takes into account existing 3GPP measurement reports, RAN conditions, and the relative load generated by the UE.
- Solution 2 is a UE-based access network selection solution, it is likely that UE-specific needs such as steering IP flows, rather than just DRB, can be more easily realized with less signaling.
- Necessary requirement 3 In order to improve the use of WLAN, it is necessary to improve the user experience and reduce battery consumption. From this point of view, Solution 2 meets the requirements by having the UE consider battery level, proximity to the WLAN, and QoS to achieve the desired result.
- -Randomization may be applied to prevent an excessive number of UEs from accessing the WLAN simultaneously.
- unnecessary WLAN scanning may be prevented by using an offload notification from the RAN.
- the UE starts this procedure only when notification is activated.
- Requirements 4 It may be possible to reduce battery consumption by defining rules that allow a UE to perform a WLAN scan only when certain RAN conditions are met. For example, UE power consumption may be reduced by having the UE scan the WLAN channel only when RSRP is below a certain threshold.
- Necessary requirement 5 If the RAN determines that the UE must use ANDSF, it may perform traffic steering based on the ANDSF. If ANDSF is not available and the RAN determines that the UE should use RAN rules, the RAN may determine which traffic is best for offloading to the WLAN.
- Solution 2 does not affect the functionality of existing 3GPP and WLAN, so it does not affect conventional systems.
- Solution 2 follows the existing WLAN scan / connection mechanism and does not affect IEEE or WFA.
- the RAN may provide the UE with a white list (or black list) of WLAN service set identifiers so that WLAN systems can be distinguished.
- SSID- may be provided for each threshold.
- Solution 2 can define a WLAN dedicated system for offloading based only on ANDSF.
- the RAN policy an existing ANDSF policy can also be used.
- Necessary requirement 9 This requirement can be achieved by utilizing separate signaling for a specific UE.
- Necessary requirement 10 By utilizing randomization (eg, the UE performs random backoff before testing whether the target cell is accessible) and providing individual assistant information (eg, threshold) for each UE, It is possible to prevent ping-pong transmission. Whether or not an additional mechanism is necessary needs further study.
- the UE is allowed to perform scan optimization (including WLAN client off). The UE performs RAN RSRP measurement regardless of whether scan optimization is applied.
- RAN rules can be further applied when the UE determines whether to switch traffic from WLAN to RAN.
- the selection of traffic to switch from WLAN to RAN is based on the UE implementation (ie, a UE that has adapted to the RAN rule should be used during the UE once it has moved to the WLAN.
- the RAN rule to which the UE adapts must be maintained until the UE receives the updated parameters (after returning to the RAN) to prevent unnecessary ping-pong transmission network selection.
- the rule preference indicator is included in the “updated parameter”.
- the need for offload preference indicators The listed parameters are provided by individual signaling or broadcast signaling. (More specifically, whether all listed parameters are provided by individual signaling or whether some parameters can be provided by broadcast signaling). If there is a situation where the RSRP threshold and the WLAN related threshold are provided by the broadcast signal, while the remaining parameters are provided by separate signaling, the RAN should not change the RSRP threshold significantly.
- the offload preference indicator is then enabled for the network to move only UEs that are close to the WLAN to the WLAN (if the network knows the location of the WLAN and UE).
- the network will send the updated parameters x, y, z with separate signaling rather than an offload preference indicator.
- the present invention is useful in the field of wireless communication.
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Abstract
Description
第1実施形態に係る通信制御方法は、セルラRANから無線LANへのオフロードを行うための方法である。前記通信制御方法は、前記セルラRANに含まれるセルラ基地局が、前記無線LANに含まれる無線LANアクセスポイントの識別子を含むリストを送信するステップと、セルラ通信部及び無線LAN通信部を有するユーザ端末が、前記リストを受信するステップと、前記セルラ基地局のセルに在圏している前記ユーザ端末が、前記リストに基づいて、前記無線LANアクセスポイントに近接したことを検知した後、前記オフロードに関する動作を行うステップと、を含む。ここで「近接したことを検知」とは、「近接したと認識する」という意味であり、実際には近接していない場合(誤検出の場合)もあり得る。以下においても同様である。
(第1実施形態に係るシステム構成)
図1は、第1実施形態に係るシステム構成図である。図1に示すように、LTEシステムは、複数のUE(User Equipment)100と、E-UTRAN(Evolved-UMTS Terrestrial Radio Access Network)10と、EPC(Evolved Packet Core)20と、を含む。E-UTRAN10は、無線アクセスネットワークに相当する。EPC20は、コアネットワークに相当する。
次に、第1実施形態に係る動作を説明する。図7は、第1実施形態に係る動作環境を説明するための図である。
第2実施形態について、上述した第1実施形態との相違点を主として説明する。第2実施形態に係るシステム構成及び動作環境は、第1実施形態と同様である。ただし、第2実施形態はeNB200主導の動作である点で第1実施形態と異なる。
第3実施形態について、上述した第1実施形態及び第2実施形態との相違点を主として説明する。
第4実施形態について、上述した第1実施形態乃至第3実施形態との相違点を主として説明する。第4実施形態に係るシステム構成及び動作環境は、第3実施形態と同様である。
第5実施形態について、上述した第1実施形態乃至第4実施形態との相違点を主として説明する。第5実施形態に係るシステム構成及び動作環境は、第3実施形態と同様である。
第6実施形態について、上述した第1実施形態乃至第5実施形態との相違点を主として説明する。第5実施形態に係るシステム構成及び動作環境は、第1実施形態と同様である。
第7実施形態について、上述した第1実施形態乃至第6実施形態との相違点を主として説明する。第7実施形態に係るシステム構成及び動作環境は、第1実施形態と同様である。
第8実施形態について、上述した第1実施形態乃至第7実施形態との相違点を主として説明する。第8実施形態に係るシステム構成及び動作環境は、第1実施形態と同様である。
第9実施形態について、上述した第1実施形態乃至第8実施形態との相違点を主として説明する。第9実施形態に係るシステム構成及び動作環境は、第1実施形態と同様である。
上記のように、本発明は各実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。
3GPP/WLANインターワーキング検討事項の主な目的の1つは、3GPPとWLANとの間のインターワーキングを、現在、CNレベルでサポートされている統合を越えて、拡張することである。ユーザ体験全般を改善するために、RANレベルでの更なる改善が必要である。その結果、ネットワークの利用を改善し、UEの不要な電力消費を削減し、2つのネットワーク間をシームレスに移動することができるようになる。付記1では、これらの目的を達成するために必要ないくつかのシナリオを検討する。
1. はじめに
どうやってソリューション(ソリューション1、2、3)が必要要件を満たすかについての考察の結果、特に、ANDSF(Access network discovery and selection function)およびRANルールに関するいくつかの不明点があるが、ソリューション2が全ての必要要件を満たすように思われる。付記2では、それらの差異と、トラフィックステアリングの必要要件を満たすためにどのように使用されるかと、について更なる説明を行う。ソリューション2は、ネットワーク選択のパラメータをRANからUEに提供可能であり、かつネットワーク選択のルール(ポリシー)に従ってネットワークの選択権をUEが持つ方式である。ソリューション2の必要要件を満たすことに関する更なる詳細については、付録にて説明する。
2.1. ANDSF対RANルール
ソリューション2に基づくほとんどの懸念事項が、ANDSFポリシーとRANルールとの関係から派生している。例えば、ある懸念事項は、UEの挙動が予測不可能であることから派生し、また、ANDSFポリシーとRANルールとの間の不明瞭な関係により発生する潜在的なピンポン伝送から派生している。以下の諸問題に対する答えは、ANDSFとRANルールとの関係を明確にする手助けになるはずである。
先の考察では、RANからWLANへのトラフィックステアリングのトリガとして、RANがUEにその負荷を通知してもよいという提案があった。そのような通知は、オペレータにとって何の利点もない。ロードバランスにおいて、ソリューション2は、所望のオフロードのレベルを変更するため、RANに3GPP RAN RSRP、RSCP、WLAN BSS負荷、およびWLAN RSSIの閾値を調整させる。さらに、アクセスネットワークの選択の精度は、負荷情報など間接的メトリックスよりも直接的メトリックスを使用することで改善もされている。
付記2において、特に、不明点に対する説明が更になされ、ソリューション2の改良点を示し、該ソリューションが全ての必要要件を満たすと結論付けた。
4.1. 必要要件充足評価
ANDSFとRANルールとを上記の通り明確化したことにより、ソリューション2が必要要件を満たすか否かを再検討することが興味深いと思われる。
ソリューション2は、ANDSFまたはRANルールを利用することによって、RAN負荷とWLAN負荷APとの間の適切なバランスを達成する。特に、RANルールは、3GPP/WLAN信号およびWLAN負荷用の閾値を規定し、明確にRANの負荷情報を提供せずに、トラフィックステアリングを制御する。UEがANDSFを利用可能であっても、RANは、ANDSFまたはRANルールが二者間で潜在的に対立しないよう利用されるか否かを判別する。
RAN/WLANの信号品質とWLAN負荷とを反映するルールを規定することによって、ユーザ体験が改善する可能性がある。ユーザ体験およびネットワークの性能の両方が改善するように、RANは閾値を規定し、既存の3GPP測定レポート、RAN状態、UEにより生成される相対的負荷を考慮に入れる。
WLANの利用を改善するためには、ユーザ体験を改善し、バッテリ消費の削減が必要である。この観点から、ソリューション2は、所望の結果を達成するため、UEにバッテリレベル、WLANへの近接、QoSを考慮させることにより、必要要件を満たしている。
特定のRANの条件が満たされた場合のみ、UEがWLANスキャンを行うことを許可するルールを規定することにより、バッテリ消費を削減できる可能性がある。例えば、RSRPが特定の閾値未満の場合のみ、UEにWLANチャンネルをスキャンさせることによって、UEの電力消費は削減される可能性がある。
もしRANがUEはANDSFを使用しなければならないと決定した場合、ANDSFに基づいてトラフィックステアリングを行ってもよい。もしANDSFが利用不可能であって、RANがUEはRANルールを使用すべきだと決定した場合、RANは、WLANにオフロードするためにはどのトラフィックが最良かを決定してもよい。
ソリューション2は、既存の3GPPおよびWLANの機能性には影響を及ぼさないので、従来のシステムに影響しない。
ソリューション2は、既存のWLANスキャン/コネクション機構に従うので、IEEEやWFAに影響しない。
WLANシステムの区別が可能になるように、RANは、UEに対して、WLANサービスセット識別子からなるホワイトリスト(またはブラックリスト)を提供してもよい。SSID-閾値毎に提供してもよい。
本必要要件は、特定のUE用の個別のシグナリングを利用することによって達成可能である。
ランダム化を利用し(例えば、UEは、目標セルにアクセス可能か否かをテストする前にランダムバックオフを実行する)、UEごとの個別のアシスタント情報(例えば、閾値)を提供することによって、ピンポン伝送を防ぐことが可能である。追加の機構が必要か否かは、今後の検討が必要である。
ルールの例:
ANDSFが利用不可能な場合(またはRANによって推奨されていない)
if RAN RSRP < x or offloading indicator == yes
if WLAN RSSI > y and WLAN BSS load < z
offload from RAN to WLAN
else if RAN RSRP > x’
if WLAN RSSI < y’ or WLAN BSS load > z’
offload from WLAN to RAN
else 受信したアシスタント情報をUEのインターワーキング上層に転送する
なお、パラメータx、x’、y、y’、z、z’はネットワークにより提供される。
if RAN RSRP > x and offloading indicator == no not signaledの場合、動機付けとして、UEはスキャン最適化が許可される(WLANクライアントオフを含む)。そして、スキャン最適化を適用するか否かに拘わらずUEはRAN RSRP測定を行う。
もしRANが所望のオフロードを通知しなくても、UEは、WLAN用のスキャンを希望すると思われる。それは、RANが、どれくらいの潜在的なUE(すなわち、RSRP > xのUE)がオフロードされないかを判別する1つの方法である。そうすれば、UEは依然としてWLAN測定をeNBに報告するが、WLANへのオフロードのターゲットにはならないだろう。MDTのようなもの。従って、RANは、将来、「x」の調整の精度を向上することができる。これは、個別のシグナリングにのみ適用できる。
リスト化されたパラメータは、個別のシグナリングまたはブロードキャストのシグナリングにより提供される。(更に詳細には、全てのリスト化されたパラメータが個別のシグナリングにより提供されているのか否か、またはいくつかのパラメータがブロードキャストシグナリングにより提供できるのか否か)。RSRP閾値とWLANに関する閾値がブロードキャスト信号により提供され、一方、残りのパラメータが個別のシグナリングにより提供される状況があれば、RANは、RSRP閾値を大幅に変更するべきではない。その後、オフロード嗜好インジケータは、ネットワークが、WLANに近接するUEだけをWLANに移動させるために有効になる(ネットワークがWLANとUEの位置を知っている場合)。
米国仮出願第61/754106(2013年1月18日出願)及び米国仮出願第61/864206(2013年8月9日出願)の全内容が、参照により、本願明細書に組み込まれている。
Claims (37)
- セルラRANから無線LANへのオフロードを行うための通信制御方法であって、
前記セルラRANに含まれるセルラ基地局が、前記無線LANに含まれる無線LANアクセスポイントの識別子を含むリストを送信するステップと、
セルラ通信部及び無線LAN通信部を有するユーザ端末が、前記リストを受信するステップと、
前記セルラ基地局のセルに在圏している前記ユーザ端末が、前記リストに基づいて、前記無線LANアクセスポイントに近接したことを検知した後、前記オフロードに関する動作を行うステップと、
を含むことを特徴とする通信制御方法。 - 前記オフロードに関する動作を行うステップにおいて、前記無線LAN通信部がオフ状態である前記ユーザ端末は、前記リストに基づいて前記無線LANアクセスポイントに近接したことを検知した後、前記無線LAN通信部をオン状態に切り替えて、前記無線LANアクセスポイントをスキャンすることを特徴とする請求項1に記載の通信制御方法。
- 前記動作は、前記無線LANアクセスポイントをスキャンすることを含み、
前記スキャンにより前記無線LANアクセスポイントが発見された場合に、前記無線LANアクセスポイントが発見されたことを示す通知を前記ユーザ端末から前記セルラ基地局に送信するステップをさらに含むことを特徴とする請求項1に記載の通信制御方法。 - 前記通知は、発見された前記無線LANアクセスポイントの識別子を含み、
前記通信制御方法は、前記セルラ基地局が、前記通知を受信した場合で、かつ、前記通知に含まれる前記識別子に対応する前記無線LANアクセスポイントがオフ状態である場合に、前記無線LANアクセスポイントを起動する起動ステップをさらに含むことを特徴とする請求項3に記載の通信制御方法。 - 前記送信するステップにおいて、前記セルラ基地局は、自セルラ基地局に関する負荷レベルに基づいて、前記リストを前記ユーザ端末に送信することを特徴とする請求項1に記載の通信制御方法。
- 前記ユーザ端末が、自ユーザ端末の状況に基づいて、前記リストを使用するか否かを判断するステップをさらに含むことを特徴とする請求項1に記載の通信制御方法。
- 前記リストは、前記セルラ基地局のセル内に設けられた無線LANアクセスポイントの識別子、又は前記セルを含むトラッキングエリア内に設けられた無線LANアクセスポイントの識別子を含むことを特徴とする請求項6に記載の通信制御方法。
- セルラRANから無線LANへのオフロードを行うための通信制御方法であって、
前記セルラRANに含まれるセルラ基地局が、前記オフロードのための情報を送信するステップと、
セルラ通信部及び無線LAN通信部を有し、前記セルラ基地局のセルに在圏しているユーザ端末が、前記情報を前記セルラ基地局から受信するステップと、
前記ユーザ端末が、前記セルラ基地局から受信した前記情報に基づいて、前記オフロードに関する動作を行うステップと、
を含むことを特徴とする通信制御方法。 - 前記動作を行うステップにおいて、前記ユーザ端末は、前記無線LAN通信部がオフ状態である場合に、前記セルラ基地局から受信した前記情報に基づいて、前記無線LAN通信部をオン状態に切り替えて、無線LANアクセスポイントをスキャンすることを特徴とする請求項8に記載の通信制御方法。
- 前記送信するステップにおいて、前記セルラ基地局は、自セルラ基地局の負荷レベルが閾値を超えた場合に、前記情報を1又は複数のユーザ端末に送信することを特徴とする請求項8に記載の通信制御方法。
- 前記スキャンにより前記無線LANアクセスポイントが発見された場合に、前記無線LANアクセスポイントが発見されたことを示す通知を前記ユーザ端末から前記セルラ基地局に送信するステップをさらに含むことを特徴とする請求項9に記載の通信制御方法。
- 前記情報は、前記無線LAN通信部をオン状態に切り替えるよう指示する情報であることを特徴とする請求項8に記載の通信制御方法。
- 前記情報は、前記無線LANアクセスポイントの位置を示す位置情報を含み、
前記動作を行うステップにおいて、前記ユーザ端末は、前記ユーザ端末が前記無線LANアクセスポイントに近接したことを前記位置情報に基づいて検知した場合に、前記動作を行うことを特徴とする請求項8に記載の通信制御方法。 - 前記情報は、前記動作を行うべき条件を示す条件情報を含み、
前記動作を行うステップにおいて、前記ユーザ端末は、前記条件が満たされたことを前記条件情報に基づいて検知した場合に、前記動作を行うことを特徴とする請求項8に記載の通信制御方法。 - 前記情報は、前記動作に適用されるパラメータを含むことを特徴とする請求項8に記載の通信制御方法。
- 前記セルラ基地局が、前記ユーザ端末の状況に基づいて、前記情報を前記ユーザ端末に送信するか否かを判断するステップをさらに含むことを特徴とする請求項8に記載の通信制御方法。
- セルラ基地局と協調する特定機器が、セルラ周波数帯域内、かつ、特定の期間において、前記特定機器の存在を知らせるための発見用信号をブロードキャストするステップと、
前記セルラ基地局に接続するユーザ端末が、前記セルラ周波数帯域内、かつ、前記特定の期間において、前記発見用信号をスキャンするステップと、
を含むことを特徴とする通信制御方法。 - 前記特定の期間は、前記セルラ基地局により指定されることを特徴とする請求項17に記載の通信制御方法。
- 前記特定機器は、前記セルラ周波数帯域外で通信を行う機器であることを特徴とする請求項17に記載の通信制御方法。
- 前記セルラ基地局は、前記セルラ周波数帯域内の第1の周波数で通信を行う基地局であり、
前記特定機器は、前記セルラ周波数帯域内の第2の周波数で通信を行う機器であり、
前記ブロードキャストするステップにおいて、前記特定機器は、前記セルラ周波数帯域内の前記第1の周波数、かつ、前記特定の期間で前記発見用信号をブロードキャストし、
前記スキャンするステップにおいて、前記ユーザ端末は、前記セルラ周波数帯域内の前記第1の周波数、かつ、前記特定の期間で前記発見用信号をスキャンすることを特徴とする請求項17に記載の通信制御方法。 - 前記発見用信号は、前記特定機器の識別子を含むことを特徴とする請求項17に記載の通信制御方法。
- 前記ユーザ端末が前記スキャンにより前記発見用信号を検出した場合に、前記発見用信号を検出したことを示す発見通知を前記ユーザ端末から前記セルラ基地局に送信するステップをさらに含むことを特徴とする請求項17に記載の通信制御方法。
- 前記ユーザ端末が前記スキャンにより前記発見用信号を検出した後、前記ユーザ端末が前記特定機器に接続した場合に、前記ユーザ端末が前記特定機器に接続したことを示す接続通知を前記特定機器から前記セルラ基地局に送信するステップをさらに含むことを特徴とする請求項17に記載の通信制御方法。
- 前記特定機器は、無線LANアクセスポイントであることを特徴とする請求項17に記載の通信制御方法。
- 前記特定機器は、小セルを管理するセルラ基地局であることを特徴とする請求項17に記載の通信制御方法。
- 前記特定機器は、端末間無線通信をサポートする他のユーザ端末であることを特徴とする請求項17に記載の通信制御方法。
- 前記セルラ周波数帯域は、ライセンスバンドに含まれており、
前記特定機器は、アンライセンスバンドで通信を行う他のセルラ基地局であることを特徴とする請求項17に記載の通信制御方法。 - セルラ基地局に接続するユーザ端末が、ライセンスバンドに含まれるセルラ周波数帯域内で特定機器からブロードキャストされるセルラ参照信号を受信するステップと、
前記セルラ参照信号に対する測定結果を示す測定情報を前記ユーザ端末から前記セルラ基地局に報告するステップと、
前記セルラ基地局が、前記ユーザ端末から報告された前記測定情報に基づいて、前記特定機器をスキャンするための情報を前記ユーザ端末に送信するステップと、
を含み、
前記特定機器は、アンライセンスバンドで通信を行う機器であることを特徴とする通信制御方法。 - 前記特定機器には、自特定機器を識別するセル識別子が割り当てられており、
前記特定機器が送信する前記セルラ参照信号は、前記セル識別子を含むことを特徴とする請求項28に記載の通信制御方法。 - アンライセンスバンドで通信を行う特定機器が、セルラ基地局に接続するユーザ端末が送信するセルラ上りリンク信号を検出するステップと、
前記特定機器が、前記セルラ上りリンク信号の検出に基づいて、前記特定機器に前記ユーザ端末が近接したことを示す通知を前記セルラ基地局に送信するステップと、
前記セルラ基地局が、前記特定機器からの前記通知に基づいて、前記特定機器をスキャンするための情報を前記ユーザ端末に送信するステップと、
を含むことを特徴とする通信制御方法。 - 前記特定機器が、自特定機器に前記ユーザ端末が近接するか否かを判断するステップをさらに含み、
前記判断するステップは、
前記ユーザ端末が送信するセルラ上りリンク信号に関する信号情報を前記セルラ基地局から取得するステップと、
前記信号情報に基づいて、前記ユーザ端末と前記特定機器との間のパスロスを推定するステップと、
前記パスロスが閾値未満である場合に、前記特定機器に前記ユーザ端末が近接すると判断するステップと、
を含むことを特徴とする請求項30に記載の通信制御方法。 - 前記特定機器が、前記特定機器と前記セルラ基地局との間の距離と、前記セルラ上りリンク信号の受信電力と、に基づいて、前記特定機器に前記ユーザ端末が近接するか否かを判断するステップをさらに含むことを特徴とする請求項30に記載の通信制御方法。
- セルラ通信部及び無線LAN通信部を有しており、セルラ基地局に接続するユーザ端末が、前記ユーザ端末の移動速度を導出する導出ステップと、
前記移動速度が閾値を超える場合には、前記無線LAN通信部がオン状態であっても、前記ユーザ端末が無線LANアクセスポイントに対するスキャンを停止する停止ステップと、
を含むことを特徴とする通信制御方法。 - ユーザ端末が特定機器からセルラ基地局に接続先を切り替える場合に、前記特定機器から前記セルラ基地局への切り替えであることを示す通知情報を前記ユーザ端末から前記セルラ基地局に送信するステップと、
前記セルラ基地局が、前記通知情報に基づいて、前記ユーザ端末宛ての送信データを前記セルラ基地局に転送するよう要求する要求情報を前記特定機器に送信するステップと、
を含み、
前記特定機器は、アンライセンスバンドで通信を行う機器であることを特徴とする通信制御方法。 - 前記通知情報は、前記特定機器を識別するための識別子を含むことを特徴とする請求項34に記載の通信制御方法。
- 前記通知情報は、前記ユーザ端末を識別するための識別子を含むことを特徴とする請求項34に記載の通信制御方法。
- ユーザ端末の接続先を、セルラ基地局のカバレッジ内に設けられた特定機器からセルラ基地局に切り替える場合に、前記特定機器が、前記セルラ基地局についての測定報告を前記ユーザ端末から受信することなく、前記ユーザ端末の接続先を前記セルラ基地局に切り替えると決定するステップと、
前記セルラ基地局への切り替えを要求する要求情報を前記特定機器から前記セルラ基地局に送信するステップと、
前記特定機器が前記要求情報に対する応答を前記セルラ基地局から受信した場合に、前記セルラ基地局への切り替えを指示する指示情報を前記特定機器から前記ユーザ端末に送信するステップと、
を含み、
前記特定機器は、アンライセンスバンドで通信を行う機器であることを特徴とする通信制御方法。
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JP2016106455A (ja) | 2016-06-16 |
US10743229B2 (en) | 2020-08-11 |
US9749922B2 (en) | 2017-08-29 |
EP2947925A4 (en) | 2017-01-18 |
EP3349512A1 (en) | 2018-07-18 |
JP2017112638A (ja) | 2017-06-22 |
EP3349512B1 (en) | 2019-08-07 |
US20170318514A1 (en) | 2017-11-02 |
US20150365868A1 (en) | 2015-12-17 |
EP2947925A1 (en) | 2015-11-25 |
US20190182739A1 (en) | 2019-06-13 |
JPWO2014112595A1 (ja) | 2017-01-19 |
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US10251109B2 (en) | 2019-04-02 |
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