WO2015025813A1 - 移動通信方法、無線端末及び無線基地局 - Google Patents
移動通信方法、無線端末及び無線基地局 Download PDFInfo
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- WO2015025813A1 WO2015025813A1 PCT/JP2014/071549 JP2014071549W WO2015025813A1 WO 2015025813 A1 WO2015025813 A1 WO 2015025813A1 JP 2014071549 W JP2014071549 W JP 2014071549W WO 2015025813 A1 WO2015025813 A1 WO 2015025813A1
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- wireless terminal
- category
- base station
- drx
- drx cycle
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
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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 mobile communication method, a radio terminal, and a radio base station used in a mobile communication system that constitutes a DRX cycle having an on period in which a downlink signal is monitored and an off period in which the downlink signal is not monitored.
- a period in which a radio terminal monitors a downlink signal transmitted from a radio base station (hereinafter referred to as an on period) and a period in which the radio terminal does not monitor a downlink signal transmitted from the radio base station (hereinafter referred to as an off period).
- a mobile communication system that employs DRX (Discontinuous Reception) to be set is known (for example, Non-Patent Document 1).
- LTE Long Term Evolution
- the DRX cycle composed of the on period and the off period is generally reported from the network (radio base station).
- the same DRX cycle is used in the cell managed by the radio base station.
- two cycles (a short DRX cycle and a long DRX cycle) are defined.
- the downlink signal transmitted from the radio base station is monitored only during any one of a plurality of on periods, and the remaining It is also conceivable that the downlink signal transmitted from the radio base station is not monitored during the ON period. However, since it is not possible to receive a downlink signal (for example, a paging signal) transmitted from the radio base station in an on period in which the downlink signal transmitted from the radio base station is not monitored, it is preferable to employ such a configuration. Absent.
- a mobile communication method is a method of configuring a DRX cycle having an on period in which a downlink signal is monitored and an off period in which the downlink signal is not monitored between a radio terminal and a radio base station.
- the mobile communication method includes a step A of notifying a category class indicating a category of the wireless terminal from the wireless terminal to the wireless base station, and a category of the wireless terminal from the wireless base station to the wireless terminal.
- step B notifying DRX identification information for identifying a DRX cycle determined according to a class, and in the wireless terminal, the downlink signal is transmitted in the ON period according to the DRX cycle identified by the DRX identification information.
- Step C for monitoring.
- the radio terminal according to the second feature is used in a mobile communication system that constitutes a DRX cycle having an on period in which a downlink signal is monitored and an off period in which the downlink signal is not monitored.
- the radio terminal is configured to notify the radio base station of a category class indicating the category of the radio terminal, and according to a DRX cycle determined by the radio base station according to the category class of the radio terminal, the on-period And a controller for monitoring the downstream signal.
- the radio base station is used in a mobile communication system that configures a DRX cycle having an on period in which a downlink signal is monitored and an off period in which the downlink signal is not monitored.
- the radio base station notifies the radio terminal of a reception unit that receives a category class indicating a category of the radio terminal from the radio terminal, and DRX identification information that identifies a DRX cycle determined according to the category class of the radio terminal.
- a notification unit is used in a mobile communication system that configures a DRX cycle having an on period in which a downlink signal is monitored and an off period in which the downlink signal is not monitored.
- the radio base station notifies the radio terminal of a reception unit that receives a category class indicating a category of the radio terminal from the radio terminal, and DRX identification information that identifies a DRX cycle determined according to the category class of the radio terminal.
- a mobile communication method includes a step A in which a radio terminal notifies a radio base station of a category class, and the radio base station notifies the radio terminal of the notified category class. Accordingly, there are provided a step B for notifying DRX identification information for identifying a DRX cycle, and a step C for monitoring the downlink signal by the wireless terminal according to the DRX cycle identified by the DRX identification information.
- the radio terminal according to the fifth feature notifies the radio base station of the category class, and applies the DRX cycle corresponding to the DRX identification information notified from the radio base station according to the category class.
- the radio base station notifies the radio terminal of DRX identification information for identifying a DRX cycle according to the category class notified from the radio terminal.
- FIG. 1 is a diagram showing a mobile communication system 100 according to the first embodiment.
- FIG. 2 is a diagram illustrating a radio frame according to the first embodiment.
- FIG. 3 is a diagram illustrating radio resources according to the first embodiment.
- FIG. 4 is a diagram illustrating DRX according to the first embodiment.
- FIG. 5 is a block diagram showing the UE 10 according to the first embodiment.
- FIG. 6 is a block diagram showing the eNB 110 according to the first embodiment.
- FIG. 7 is a diagram illustrating an example of a table according to the first embodiment.
- FIG. 8 is a diagram illustrating an example of a table according to the first embodiment.
- FIG. 9 is a diagram illustrating an example of a table according to the first embodiment.
- FIG. 10 is a sequence diagram showing the mobile communication method according to the first embodiment.
- the mobile communication method is a method of configuring a DRX cycle having an on period in which a downlink signal is monitored and an off period in which the downlink signal is not monitored, between a radio terminal and a radio base station.
- the mobile communication method includes a step A of notifying a category class indicating a category of the wireless terminal from the wireless terminal to the wireless base station, and a category of the wireless terminal from the wireless base station to the wireless terminal.
- step B notifying DRX identification information for identifying a DRX cycle determined according to a class, and in the wireless terminal, the downlink signal is transmitted in the ON period according to the DRX cycle identified by the DRX identification information.
- Step C for monitoring.
- the DRX cycle is determined according to the category class of the radio terminal by notifying the radio base station of the category class of the radio terminal that can be grasped only by the radio terminal from the radio terminal. An appropriate DRX cycle can be set.
- the same DRX cycle is fixedly defined in the cell, but in the embodiment, the DRX cycle can be set flexibly.
- FIG. 1 is a diagram showing a mobile communication system 100 according to the first embodiment.
- the mobile communication system 100 includes a radio terminal 10 (hereinafter referred to as UE 10) and a core network 50.
- the mobile communication system 100 includes a first communication system and a second communication system.
- the first communication system is a communication system that supports, for example, LTE (Long Term Evolution).
- the first communication system includes, for example, a radio base station 110 (hereinafter, eNB 110) and an MME 120.
- eNB 110 radio base station 110
- MME 120 MME
- a first RAT EUTRAN; Evolved Universal Terrestrial Access Network
- the second communication system is a communication system corresponding to, for example, WCDMA (Wideband Code Division Multiple Access).
- the second communication system includes a radio base station 210, an RNC 220, and an SGSN 230.
- a second RAT UTRAN; Universal Terrestrial Access Network
- the UE 10 is a device (User Equipment) configured to communicate with the first communication system and the second communication system.
- the UE 10 has a function of performing wireless communication with the eNB 110 and a function of performing wireless communication with the wireless base station 210.
- the eNB 110 is a device (evolved NodeB) that includes the cell 111 and performs radio communication with the UE 10 existing in the cell 111.
- the MME 120 is a device (Mobility Management Entity) that manages the mobility of the UE 10 that establishes a wireless connection with the eNB 110.
- the MME 120 is provided in the core network 50.
- the radio base station 210 has a cell 211 and is a device (NodeB) that performs radio communication with the UE 10 existing in the cell 211.
- NodeB a device that performs radio communication with the UE 10 existing in the cell 211.
- the RNC 220 is a device (Radio Network Controller) that is connected to the radio base station 210 and sets a radio connection (RRC Connection) with the UE 10 existing in the cell 211.
- Radio Network Controller Radio Network Controller
- SGSN 230 is a device (Serving GPRS Support Node) that performs packet switching in the packet switching domain.
- the SGSN 230 is provided in the core network 50.
- an apparatus MSC: Mobile Switching Center
- MSC Mobile Switching Center
- the first communication system will be mainly described. However, the following description may be applied to the second communication system.
- the cell should be understood as a function of performing radio communication with the UE 10. However, the cell may be considered as a service area indicating a range in which communication with the cell is possible.
- the OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single-Carrier Frequency Multiplex
- a method is used.
- an uplink control channel (PUCCH; Physical Link Control Channel), an uplink shared channel (PUSCH; Physical Uplink Channel), and the like exist as uplink channels.
- PUSCH Physical Uplink Channel
- downlink channels there are a downlink control channel (PDCCH; Physical Downlink Control Channel), a downlink shared channel (PDSCH; Physical Downlink Shared Channel), and the like.
- the uplink control channel is a channel that carries a control signal.
- the control signal includes, for example, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), SR (Scheduling Request), ACK / NACK, and the like.
- CQI is a signal notifying the recommended modulation method and coding rate that should be used for downlink transmission.
- PMI is a signal indicating a precoder matrix that is preferably used for downlink transmission.
- the RI is a signal indicating the number of layers (number of streams) to be used for downlink transmission.
- SR is a signal for requesting allocation of uplink radio resources (resource blocks to be described later).
- ACK / NACK is a signal indicating whether or not a signal transmitted via a downlink channel (for example, PDSCH) has been received.
- the uplink shared channel is a channel that carries a control signal (including the control signal described above) and / or a data signal.
- the uplink radio resource may be allocated only to the data signal, or may be allocated so that the data signal and the control signal are multiplexed.
- the downlink control channel is a channel that carries a control signal.
- the control signals are, for example, Uplink SI (Scheduling Information), Downlink SI (Scheduling Information), and TPC bits.
- Uplink SI is a signal indicating the allocation of uplink radio resources.
- Downlink SI is a signal indicating allocation of downlink radio resources.
- the TPC bit is a signal instructing increase / decrease in power of a signal transmitted through an uplink channel.
- the downlink shared channel is a channel that carries control signals and / or data signals.
- the downlink radio resource may be allocated only to the data signal, or may be allocated so that the data signal and the control signal are multiplexed.
- TA Triming Advance
- TA is transmission timing correction information between the UE 10 and the eNB 110, and is measured by the eNB 110 based on an uplink signal transmitted from the UE 10.
- ACK / NACK can be cited as a control signal transmitted via a channel other than the downlink control channel (PDCCH) or downlink shared channel (PDSCH).
- ACK / NACK is a signal indicating whether or not a signal transmitted via an uplink channel (for example, PUSCH) has been received.
- FIG. 2 is a diagram illustrating a radio frame in the first communication system.
- one radio frame is composed of 10 subframes, and one subframe is composed of two slots.
- the time length of one slot is 0.5 msec
- the time length of one subframe is 1 msec
- the time length of one radio frame is 10 msec.
- One slot is composed of a plurality of OFDM symbols (for example, six OFDM symbols or seven OFDM symbols) in the downlink direction.
- one slot is configured by a plurality of SC-FDMA symbols (for example, six SC-FDMA symbols or seven SC-FDMA symbols) in the uplink direction.
- FIG. 3 is a diagram illustrating radio resources in the first communication system.
- radio resources are defined by a frequency axis and a time axis.
- the frequency is composed of a plurality of subcarriers, and a predetermined number of subcarriers (12 subcarriers) are collectively referred to as a resource block (RB).
- RB resource block
- the time has units such as an OFDM symbol (or SC-FDMA symbol), a slot, a subframe, and a radio frame.
- radio resources can be allocated for each resource block. Also, it is possible to divide and allocate radio resources to a plurality of users (for example, user # 1 to user # 5) on the frequency axis and the time axis.
- radio resources are allocated by the eNB 110.
- the eNB 110 is assigned to each UE 10 based on CQI, PMI, RI, and the like.
- FIG. 4 is a diagram for explaining intermittent reception.
- the UE 10 can configure intermittent reception in order to suppress power consumption in the connected state or the idle state.
- eNB 110 is illustrated as a radio base station, but the embodiment is not limited to this.
- the radio base station may be the radio base station 210.
- the UE 10 notifies the eNB 110 of a category class indicating the category of the UE 10 (hereinafter, UE_CATEGORY_CLASS).
- UE_CATEGORY_CLASS may indicate an operation category corresponding to the operation of UE 10 (current operation).
- UE_CATEGORY_CLASS is an operation category corresponding to the operation of UE 10 (current operation), or in addition to indicating an operation category corresponding to the operation of UE 10, at least for each type or status of UE 10 It may indicate a category such as a corresponding type category or status category.
- the eNB 110 notifies the UE 10 of DRX identification information (hereinafter referred to as DRX_CYCLE_INDEX) for identifying a DRX cycle determined according to the notified UE_CATEGORY_CLASS.
- DRX_CYCLE_INDEX DRX identification information
- the UE 10 monitors the downlink signal in the on period according to the DRX cycle identified by DRX_CYCLE_INDEX.
- the eNB 110 may notify the DRX cycle or the DRX cycle.
- UE_CATEGORY_CLASS includes, for example, (A) type of UE 10 (hereinafter referred to as UE type), (B) time zone in which UE 10 operates (hereinafter referred to as operation time zone), and (C) time in which the idle state of UE 10 continues (hereinafter referred to as continuation).
- UE type type of UE 10
- operation time zone time zone in which UE 10 operates
- continuation time in which the idle state of UE 10 continues
- (D) the power state of the device to which the UE 10 is connected (hereinafter referred to as the power state)
- (E) the remaining amount of battery that supplies power to the UE 10 (hereinafter referred to as the remaining battery amount)
- (F) the moving speed of the UE 10 (Hereinafter referred to as “movement speed”)
- (G) indicates the type or number of applications (hereinafter referred to as applications) operating on the UE 10 or the device to which the UE 10 is connected.
- the UE type is a type of a communication module or the like mounted on a device such as a mobile phone, a vehicle, or a home appliance. Depending on the type of the UE 10, for example, the operation state of the UE 10 may be different due to the type of the communication module of the UE 10 being different.
- UE_CATEGORY_CLASS indicates the type category of the UE 10.
- UE_CATEGORY_CLASS indicating the type of a specific UE 10 is associated with a longer DRX cycle or DRX_CYCLE_INDEX corresponding to the DRX cycle than UE_CATEGORY_CLASS indicating the type of another UE 10.
- the operating time zone is, for example, a time zone such as nighttime or daytime.
- the operation state of the UE 10 may vary depending on the time zone.
- UE_CATEGORY_CLASS indicates an operation category of the UE 10.
- UE_CATEGORY_CLASS indicating a time zone with low communication frequency is associated with a longer DRX cycle or DRX_CYCLE_INDEX corresponding to the DRX cycle than UE_CATEGORY_CLASS indicating a time zone with high communication frequency.
- the duration is a time for which the idle state of the UE 10 continues.
- the duration is a time for which the idle state continues from the timing at which the UE 10 transitions to the idle state when the operation of the UE 10 ends.
- the duration is a time during which the idle state continues from the timing at which the device transitions to the idle state with the end of the communication request from the device to the UE 10.
- UE_CATEGORY_CLASS indicates an operation category of the UE 10.
- UE_CATEGORY_CLASS indicating that the duration time of the idle state is longer is associated with a longer DRX cycle or DRX_CYCLE_INDEX corresponding to the DRX cycle than UE_CATEGORY_CLASS indicating that the duration time of the idle state is shorter.
- a power supply state is a power supply state of the apparatus to which UE10 was connected as mentioned above.
- the operation state of the UE 10 may differ depending on the power state of the device.
- UE_CATEGORY_CLASS indicates the status category of the UE 10.
- the power state is the state of the engine (or motor) of the vehicle.
- UE10 is a communication module mounted in a household appliance, it is the state of the power supply of a household appliance.
- the power state may indicate that a predetermined time has elapsed since the power of the device to which the UE 10 is connected is turned off. For example, it may indicate that a predetermined time has elapsed from the timing when the vehicle engine (or motor) switch is turned off, or indicate that a predetermined time has elapsed since the timing when the home appliance was turned off. May be.
- UE_CATEGORY_CLASS indicating that the time that has elapsed since the power of the device to which the UE 10 is connected is longer is the time that has elapsed since the power to the device to which the UE 10 is disconnected is shorter Compared to UE_CATEGORY_CLASS indicating that the DRX cycle is longer, or DRX_CYCLE_INDEX corresponding to the DRX cycle is associated.
- the battery level is the remaining level of the battery that supplies power to the UE 10.
- the operation state (for example, energy saving mode) of the UE 10 may change depending on the remaining battery level.
- UE_CATEGORY_CLASS indicates the status category of the UE 10.
- the remaining battery level is the remaining battery level provided in the mobile phone.
- the remaining battery level is the remaining battery level provided in the device.
- the remaining battery level may be the remaining battery level allocated to the UE 10 among the remaining battery levels provided in the device.
- UE_CATEGORY_CLASS indicating that the battery level of the UE 10 is lower is associated with a longer DRX cycle or DRX_CYCLE_INDEX corresponding to the DRX cycle than the UE_CATEGORY_CLASS indicating that the battery level of the UE 10 is higher.
- the movement speed is the movement speed of the UE 10 as described above.
- the operation state of the UE 10 for example, the measurement period of the downlink signal reception quality, the report period of the reception quality measurement result
- UE_CATEGORY_CLASS indicates an operation category of the UE 10.
- UE_CATEGORY_CLASS indicating that the moving speed of the UE 10 is slower is associated with a longer DRX period or DRX_CYCLE_INDEX corresponding to the DRX period than the UE_CATEGORY_CLASS indicating that the moving speed of the UE 10 is higher.
- the application is an application executed on the UE 10 or on a device to which the UE 10 is connected.
- the operation state of the UE 10 (for example, whether a specific application is being executed or whether the number of running applications is a predetermined number or more) may change.
- UE_CATEGORY_CLASS indicates the status category of the UE 10.
- UE_CATEGORY_CLASS indicating an application with lower communication frequency is associated with a longer DRX cycle or DRX_CYCLE_INDEX corresponding to the DRX cycle than UE_CATEGORY_CLASS indicating an application with higher communication frequency.
- FIG. 5 is a block diagram showing the UE 10 according to the first embodiment. As illustrated in FIG. 5, the UE 10 includes a communication unit 11 and a control unit 12.
- the communication unit 11 receives a signal from the eNB 110 (or the radio base station 210). Alternatively, the communication unit 11 transmits a signal to the eNB 110 (or the radio base station 210). Note that the communication unit 11 includes, for example, an antenna (a plurality of antennas when MIMO is used), a demodulation unit, a modulation unit, and the like.
- the communication unit 11 notifies UE_CATEGORY_CLASS indicating the category of the UE 10 to the eNB 110 (or the radio base station 210). Thereafter, the communication unit 11 receives from the eNB 110 (or the radio base station 210) DRX_CYCLE_INDEX that identifies the DRX cycle determined according to the notified UE_CATEGORY_CLASS.
- the control unit 12 controls the UE 10.
- the control unit 12 controls on / off of the communication unit 11 when discontinuous reception (DRX) is configured. That is, the control unit 12 turns on the communication unit 11 during the on period for monitoring the downlink signal, and monitors the downlink signal (for example, PDCCH) transmitted from the eNB 110.
- the control unit 12 turns off the communication unit 11 during an off period in which the downlink signal is not monitored, and does not monitor the downlink signal (for example, PDCCH) transmitted from the eNB 110.
- control unit 12 instructs the communication unit 11 to notify UE_CATEGORY_CLASS indicating the category of the UE 10 in response to detection of a predetermined trigger.
- the predetermined trigger may be, for example, location registration of UE 10 or transition from an idle state to a connected state.
- UE_CATEGORY_CLASS may be included in the location registration message or the RRC connection request message.
- the predetermined trigger is, for example, a timing at which the operation state of the UE 10 changes. It may be.
- the predetermined trigger is to switch the time zone during which UE 10 is operating.
- UE_CATEGORY_CLASS is the duration
- the predetermined trigger is that the time during which the idle state continues reaches the predetermined time.
- the predetermined trigger is that the power of the device is turned off or that a predetermined time elapses from the timing when the power of the device is turned off.
- UE_CATEGORY_CLASS is the remaining battery level
- the remaining battery level is below a predetermined threshold or the remaining battery level is above a predetermined threshold.
- UE_CATEGORY_CLASS is a moving speed
- the moving speed of UE10 is less than a predetermined threshold value, or the moving speed of UE10 is above a predetermined threshold value.
- the control unit 12 specifies UE_CATEGORY_CLASS corresponding to the category of the UE 10 with reference to, for example, the table shown in FIG. In the table shown in FIG. 7, the category of UE10 and UE_CATEGORY_CLASS are associated with each other.
- the control unit 12 monitors the downlink signal in the on period according to the DRX cycle identified by the DRX_CYCLE_INDEX received from the eNB 110 (or the radio base station 210). As described above, DRX_CYCLE_INDEX is determined according to UE_CATEGORY_CLASS.
- FIG. 6 is a block diagram showing the eNB 110 according to the first embodiment. As illustrated in FIG. 6, the eNB 110 includes a communication unit 115 and a control unit 116.
- the communication unit 115 receives a signal from the UE 10. Alternatively, the communication unit 115 transmits a signal to the UE 10. Note that the communication unit 115 includes, for example, an antenna, a demodulation unit, a modulation unit, and the like.
- the control unit 116 controls the eNB 110. For example, the control unit 116 allocates resources for the UE 10 to transmit an uplink signal or resources for the UE 10 to receive an uplink signal.
- FIG. 10 is a sequence diagram showing the mobile communication method according to the first embodiment.
- eNB 110 is illustrated as a radio base station, but the embodiment is not limited to this.
- the radio base station may be the radio base station 210.
- step S10 the UE 10 detects a predetermined trigger.
- the predetermined trigger is different depending on the category of the UE 10 as described above.
- step S20 the UE 10 notifies the eNB 110 of a category class (UE_CATEGORY_CLASS) indicating the category of the UE 10.
- UE_CATEGORY_CLASS a category class indicating the category of the UE 10.
- step S30 the eNB 110 determines a DRX cycle according to UE_CATEGORY_CLASS. As described above, the eNB 110 may specify DRX_CYCLE_INDEX corresponding to UE_CATEGORY_CLASS with reference to the table shown in FIG.
- step S40 the eNB 110 notifies the UE 10 of DRX identification information (DRX_CYCLE_INDEX) for identifying a DRX cycle determined according to UE_CATEGORY_CLASS.
- DRX_CYCLE_INDEX DRX identification information
- step S50 the UE 10 monitors the downlink signal in the ON period according to the DRX cycle identified by DRX_CYCLE_INDEX.
- the DRX cycle determined according to the category of the UE 10 is different from a conventional DRX cycle (for example, a short DRX cycle or a long DRX cycle) in that it is determined using a signal notified from the UE 10 to the eNB 110. Should be noted.
- a conventional DRX cycle for example, a short DRX cycle or a long DRX cycle
- the table (see FIG. 9) for associating UE_CATEGORY_CLASS and DRX_CYCLE_INDEX may be different depending on the installation location of the wireless base station (a downtown area, a countryside, etc.).
- the message notifying UE_CATEGORY_CLASS may be various uplink messages transmitted from the UE, and may be transmitted via an uplink control channel (PUCCH) or an uplink shared channel (PUSCH). .
- PUCCH uplink control channel
- PUSCH uplink shared channel
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Abstract
Description
実施形態に係る移動通信方法は、無線端末と無線基地局との間において、下り方向信号を監視するオン期間及び前記下り方向信号を監視しないオフ期間を有するDRX周期を構成する方法である。移動通信方法は、前記無線端末から前記無線基地局に対して、前記無線端末のカテゴリを示すカテゴリクラスを通知するステップAと、前記無線基地局から前記無線端末に対して、前記無線端末のカテゴリクラスに応じて決定されるDRX周期を識別するDRX識別情報を通知するステップBと、前記無線端末において、前記DRX識別情報によって識別されるDRX周期に応じて、前記オン期間において前記下り方向信号を監視するステップCとを備える。
(移動通信システム)
以下において、第1実施形態に係る移動通信システムについて説明する。図1は、第1実施形態に係る移動通信システム100を示す図である。
以下において、第1通信システムにおける無線フレームについて説明する。図2は、第1通信システムにおける無線フレームを示す図である。
以下において、第1通信システムにおける無線リソースについて説明する。図3は、第1通信システムにおける無線リソースを示す図である。
以下において、間欠受信(DRX;Discontinuous Reception)について説明する。図4は、間欠受信について説明するための図である。UE10は、コネクティッド状態又はアイドル状態において、消費電力を抑制するために、間欠受信を構成することが可能である。ここでは、無線基地局として、eNB110を例示するが、実施形態は、これに限定されるものではない。無線基地局は、無線基地局210であってもよい。
UE種別は、例えば、携帯電話、車両又は家電等の機器に搭載される通信モジュール等の種別である。UE10の種別に応じて、例えば、UE10の通信モジュール等の種別が異なることにより、UE10の動作状態が異なることがある。UE_CATEGORY_CLASSは、UE10の種別カテゴリを示している。
動作時間帯は、例えば、夜間、昼間等の時間帯である。時間帯に応じてUE10の動作状態が異なることがある。UE_CATEGORY_CLASSは、UE10の動作カテゴリを示している。
継続時間は、上述したように、UE10のアイドル状態が継続する時間である。例えば、継続時間は、UE10の操作終了に伴ってアイドル状態に遷移したタイミングからアイドル状態が継続する時間である。或いは、UE10が機器に搭載される通信モジュールである場合には、継続時間は、機器からUE10に対する通信要求の終了に伴ってアイドル状態に遷移したタイミングからアイドル状態が継続する時間である。UE_CATEGORY_CLASSは、UE10の動作カテゴリを示している。
電源状態は、上述したように、UE10が接続された機器の電源状態である。機器の電源状態に応じてUE10の動作状態が異なることがある。UE_CATEGORY_CLASSは、UE10のステータスカテゴリを示している。
電池残量は、UE10に電力を供給する電池の残量である。電池残量に応じてUE10の動作状態(例えば、省エネルギーモード)が変化することがある。UE_CATEGORY_CLASSは、UE10のステータスカテゴリを示している。
移動速度は、上述したように、UE10の移動速度である。移動速度に応じてUE10の動作状態(例えば、下り方向信号の受信品質の測定周期、受信品質の測定結果の報告周期)が変化することがある。UE_CATEGORY_CLASSは、UE10の動作カテゴリを示している。
アプリケーションは、上述したように、UE10上或いはUE10が接続された機器上において実行されるアプリケーションである。アプリケーションの種類・数に応じてUE10の動作状態(例えば、特定のアプリケーションが実行中であるか否か、実行中アプリケーションの数が所定数以上であるか否か)が変化することがある。UE_CATEGORY_CLASSは、UE10のステータスカテゴリを示している。
以下において、第1実施形態に係る無線端末について説明する。図5は、第1実施形態に係るUE10を示すブロック図である。図5に示すように、UE10は、通信部11と、制御部12とを有する。
以下において、第1実施形態に係る無線基地局について説明する。ここでは、無線基地局として、eNB110を例示するが、実施形態は、これに限定されるものではない。無線基地局は、無線基地局210であってもよい。図6は、第1実施形態に係るeNB110を示すブロック図である。図6に示すように、eNB110は、通信部115と、制御部116とを有する。
以下において、第1実施形態に係る移動通信方法について説明する。図10は、第1実施形態に係る移動通信方法を示すシーケンス図である。ここでは、無線基地局として、eNB110を例示するが、実施形態は、これに限定されるものではない。無線基地局は、無線基地局210であってもよい。
第1実施形態では、UE10からeNB110に対して、UE10でしか把握することができないUE10のカテゴリを通知することによって、UE10のカテゴリに応じてDRX周期が決定されるため、適切なDRX周期を設定することが可能である。
本発明は上述した実施形態によって説明したが、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ろう。
Claims (9)
- 無線端末と無線基地局との間において、下り方向信号を監視するオン期間及び前記下り方向信号を監視しないオフ期間を有するDRX周期を構成する移動通信方法であって、
前記無線端末から前記無線基地局に対して、前記無線端末のカテゴリを示すカテゴリクラスを通知するステップAと、
前記無線基地局から前記無線端末に対して、前記無線端末から通知されたカテゴリクラスに応じて決定されるDRX周期を識別するDRX識別情報を通知するステップBと、
前記無線端末において、前記DRX識別情報によって識別されるDRX周期に応じて、前記オン期間において前記下り方向信号を監視するステップCとを備えることを特徴とする移動通信方法。 - 前記無線端末のカテゴリは、前記無線端末の動作、種別又はステータスの少なくともいずれかを示すカテゴリであることを特徴とする請求項1に記載の移動通信方法。
- 前記ステップAにおいて、前記無線端末は、前記無線端末の動作状態の変更に応じて、前記カテゴリクラスを前記無線基地局に送信することを特徴とする請求項1に記載の移動通信方法。
- 前記カテゴリクラスは、前記無線端末の種別、前記無線端末が動作する時間帯、前記無線端末のアイドル状態が継続する時間、前記無線端末が接続された機器の電源状態、前記無線端末に電力を供給する電池の残量、前記無線端末の移動速度、前記無線端末上或いは前記無線端末が接続された機器上において実行されるアプリケーションのいずれかを示すことを特徴とする請求項1に記載の移動通信方法。
- 下り方向信号を監視するオン期間及び前記下り方向信号を監視しないオフ期間を有するDRX周期を構成する移動通信システムで用いる無線端末であって、
前記無線端末のカテゴリを示すカテゴリクラスを無線基地局に通知する通知部と、
前記無線端末のカテゴリクラスに応じて前記無線基地局で決定されるDRX周期に応じて、前記オン期間において前記下り方向信号を監視する制御部とを備えることを特徴とする無線端末。 - 下り方向信号を監視するオン期間及び前記下り方向信号を監視しないオフ期間を有するDRX周期を構成する移動通信システムで用いる無線基地局であって、
無線端末のカテゴリを示すカテゴリクラスを前記無線端末から受信する受信部と、
前記無線端末のカテゴリクラスに応じて決定されるDRX周期を識別するDRX識別情報を前記無線端末に通知する通知部とを備えることを特徴とする無線基地局。 - 無線端末が、無線基地局に対して、カテゴリクラスを通知するステップAと、
前記無線基地局が、前記無線端末に対して、前記通知されたカテゴリクラスに応じて、DRX周期を識別するDRX識別情報を通知するステップBと、
前記無線端末が、前記DRX識別情報によって識別されるDRX周期に応じて、下り方向信号を監視するステップCとを備えることを特徴とする移動通信方法。 - 無線基地局に対してカテゴリクラスを通知し、当該カテゴリクラスに応じて前記無線基地局から通知されたDRX識別情報に対応するDRX周期を適用することを特徴とする無線端末。
- 無線端末から通知されたカテゴリクラスに応じて、DRX周期を識別するDRX識別情報を前記無線端末に通知することを特徴とする無線基地局。
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