WO2016002393A1 - ユーザ端末、無線基地局、無線通信システムおよび無線通信方法 - Google Patents
ユーザ端末、無線基地局、無線通信システムおよび無線通信方法 Download PDFInfo
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- WO2016002393A1 WO2016002393A1 PCT/JP2015/065160 JP2015065160W WO2016002393A1 WO 2016002393 A1 WO2016002393 A1 WO 2016002393A1 JP 2015065160 W JP2015065160 W JP 2015065160W WO 2016002393 A1 WO2016002393 A1 WO 2016002393A1
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- transmission power
- cell
- user terminal
- base station
- cell group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/365—Power headroom reporting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
Definitions
- the present invention relates to a user terminal, a radio base station, a radio communication system, and a radio communication method in a next generation mobile communication system.
- Non-Patent Document 1 In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates and lower delay (Non-Patent Document 1).
- LTE Long Term Evolution
- LTE uses a multi-access scheme based on OFDMA (Orthogonal Frequency Division Multiple Access) for the downlink (downlink) and SC-FDMA (Single Carrier Frequency Division Multiple Access) for the uplink (uplink). Is used.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- LTE Advanced or LTE enhancement has been studied, and LTE Rel. It is specified as 10/11.
- the 10/11 system band includes at least one component carrier (CC: Component Carrier) having the system band of the LTE system as a unit.
- CC Component Carrier
- CA carrier aggregation
- LTE Rel. Is a further successor system of LTE. 12, various scenarios in which a plurality of cells are used in different frequency bands (carriers) are being studied.
- carriers frequency bands
- the radio base stations forming a plurality of cells are substantially the same, the above-described carrier aggregation can be applied.
- dual connectivity DC
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the concept of guaranteed transmission power for each radio base station or cell group is introduced.
- carrier aggregation for each radio base station or cell group can be applied.
- activation and deactivation of cells in a cell group can be performed independently and dynamically between cell groups by MAC signaling or a timer managed by a user terminal or a radio base station.
- the transmission power of the user terminal increases according to the number of activated cells. Therefore, there is a possibility that the transmission power per cell group that the radio base station wants to guarantee varies depending on the number of activated cells.
- RRC signaling that indicates guaranteed transmission power is performed at the same frequency as active / inactive control performed in the MAC layer, overhead and delay increase, and throughput may deteriorate.
- the present invention has been made in view of such points, and provides a user terminal, a radio base station, a radio communication system, and a radio communication method capable of appropriately performing user terminal operations when setting guaranteed transmission power in dual connectivity. For the purpose.
- a user terminal is a user terminal that communicates with a plurality of cell groups each composed of one or more cells using different frequencies, and each of the guaranteed transmission power value for each cell and the cells in the cell group
- a power control unit that controls the guaranteed transmission power value of the cell group using the reception unit that receives the active / inactive information, the number of cells in the active state, and the guaranteed transmission power value for each cell; It is characterized by having.
- PDCCH Physical Downlink Control Channel
- EPDCCH extended physical downlink control channel
- HetNet Heterogeneous Network
- Carrier aggregation and dual connectivity can be applied to the HetNet configuration.
- FIG. 1A shows communication between a radio base station and a user terminal related to carrier aggregation.
- the radio base station eNB1 is a radio base station forming a macro cell (hereinafter referred to as a macro base station), and the radio base station eNB2 is a radio base station forming a small cell (hereinafter referred to as a small base station).
- the small base station may be configured as an RRH (Remote Radio Head) connected to the macro base station.
- RRH Remote Radio Head
- one scheduler controls scheduling of a plurality of cells.
- the scheduler of the macro base station eNB1 controls the scheduling of a plurality of cells.
- the radio base stations are connected by an ideal backhaul such as a high-speed line such as an optical fiber.
- FIG. 1B shows communication between a radio base station and a user terminal related to dual connectivity.
- a plurality of schedulers are provided independently, and one or more cells respectively managed by the plurality of schedulers (for example, a scheduler possessed by the radio base station MeNB and a scheduler possessed by the radio base station SeNB) Control the scheduling of
- a scheduler possessed by the radio base station MeNB and a scheduler possessed by the radio base station SeNB Control the scheduling of In the configuration in which the scheduler possessed by the radio base station MeNB and the scheduler possessed by the radio base station SeNB control the scheduling of one or more cells under their jurisdiction, for example, a non-ideal backhaul (non ⁇ It is assumed that each radio base station is connected by ideal backhaul.
- each radio base station sets a cell group (CG: Cell Group) composed of one or a plurality of cells.
- CG Cell Group
- Each cell group is composed of one or more cells formed by the same radio base station, or one or more cells formed by the same transmission point such as a transmission antenna device or a transmission station.
- a cell group including PCell is called a master cell group (MCG), and a cell group other than the master cell group is called a secondary cell group (SCG).
- MCG master cell group
- SCG secondary cell group
- the total number of cells constituting the master cell group and the secondary cell group is set to be a predetermined value (for example, 5 cells) or less.
- a radio base station in which a master cell group is set is called a master base station (MeNB: Master eNB), and a radio base station in which a secondary cell group is set is called a secondary base station (SeNB: Secondary eNB).
- the total number of cells constituting the master cell group and the secondary cell group is set to be a predetermined value (for example, 5 cells) or less.
- wireless base stations do not assume tight cooperation equivalent to carrier aggregation. Therefore, the user terminal independently performs downlink L1 / L2 control (PDCCH / EPDCCH) and uplink L1 / L2 control (UCI (Uplink Control Information feedback by PUCCH / PUSCH)) for each cell group. Therefore, also in the secondary base station, a special SCell having a function equivalent to that of the PCell such as a common search space or PUCCH is required. In this specification, a special SCell having a function equivalent to that of PCell is also referred to as “PSCell (Primary Secondary Cell)”.
- PDCCH Downlink L1 / L2 control
- UCI Uplink Control Information feedback by PUCCH / PUSCH
- one radio base station controls scheduling of two radio base stations (see FIG. 2A). That is, the macro base station eNB1 may perform transmission power control that dynamically adjusts transmission power within a range in which the total transmission power of user terminals for the two radio base stations eNB1 and eNB2 does not exceed the allowable maximum transmission power. Yes (see FIG. 2B).
- the master base station MeNB and the secondary base station SeNB each control what kind of power control the paired radio base stations (secondary base station SeNB for the master base station MeNB and master base station MeNB for the secondary base station SeNB) have. Since it is not possible to grasp whether or not it is performed, there is a possibility that the timing and frequency at which such power scaling and dropping occur cannot be assumed. For the master base station MeNB and the secondary base station SeNB, when unexpected power scaling or dropping is performed, uplink communication cannot be performed correctly, and communication quality and throughput may be significantly degraded.
- the subframe transmission timing difference between cell groups can take any value.
- transmission in one cell group and transmission in another cell group may overlap by half of the subframe.
- the allowable maximum transmission power may be exceeded only in a half subframe section in which transmissions to two cell groups overlap, and there is a possibility that power scaling or dropping is performed only on that part.
- the radio base station When power scaling or dropping is performed over the entire subframe, the radio base station receives the transmitted subframe and estimates the received power or amplitude of the subframe by performing channel estimation using the reference signal included in the subframe. Therefore, there is a possibility that some or all of the signals or channels included in the subframe can be correctly demodulated.
- reception power or amplitude may be different between the reference signal and data. In such a case, even if the radio base station uses the reference signal, it cannot grasp how power scaling or dropping has been performed in the subframe, so that a part or all of the signal can be correctly demodulated from the received subframe. The possibility is likely to be smaller.
- the transmission power is controlled independently at each radio base station, so it is difficult to perform transmission power control so that the total transmission power of the user terminals does not exceed the allowable maximum transmission power.
- the concept of “minimum guaranteed power” for each radio base station or cell group is introduced.
- the guaranteed transmission power of xCG MCG or SCG
- P xeNB P MeNB or P SeNB
- the radio base station xeNB MeNB or SeNB
- sends both the guaranteed transmission power P MeNB and P SeNB to the user terminal Alternatively, either one is notified by higher layer signaling such as RRC.
- the user terminal When there is a transmission request from the radio base station xeNB, that is, when the transmission of PUSCH or PUCCH is triggered by the uplink grant or RRC, the user terminal calculates the transmission power to xCG, and the required transmission power If (required power) is equal to or less than guaranteed transmission power PxeNB , the requested power is determined as xCG transmission power.
- the user terminal may control the transmission power to be equal to or less than the guaranteed transmission power PxeNB depending on conditions. Specifically, when the total required power of the master cell group and the secondary cell group may exceed the allowable maximum transmission power P CMAX of the user terminal, the user terminal is required to have a power exceeding the guaranteed transmission power PxeNB. Perform power scaling (scaling) and channel or signal dropping for the selected cell group. As a result, when the transmission power is equal to or lower than the guaranteed transmission power PxeNB , no further power scaling or channel or signal dropping is performed.
- the user terminal Power scaling or dropping is performed on a cell group whose transmission power per cell group exceeds the guaranteed transmission power PxeNB, and control is performed so that the total transmission power per user terminal does not exceed the allowable maximum transmission power P CMAX of the user terminal. (Condition 1).
- the user terminal when the user terminal cannot grasp that the required power of the partial overlap section does not exceed the allowable maximum transmission power P CMAX of the user terminal in the asynchronous dual connectivity, the user terminal transmits the transmission power of each cell group. Are allocated so as to be equal to or less than the guaranteed transmission power PxeNB (condition 2).
- the user terminal obtains and compares the transmission power (required power for each CC) required for the CC and the allowable maximum transmission power P CMAX, c for each CC.
- the user terminal performs power scaling and channel or signal dropping, and sets the CC transmission power to PCMAX, c or less.
- the user terminal obtains an allowable maximum transmission power PCMAX per user terminal.
- the obtained transmission power for each CC is added for each cell group, and in each of the master cell group and the secondary cell group, it is confirmed whether the total transmission power for each CC exceeds the guaranteed transmission power P MeNB and P SeNB. .
- the user terminal determines the transmission power as the transmission power of the cell group. To do.
- the user terminal can Apply power scaling or dropping with. If the total transmission power of CCs belonging to the cell group falls below the guaranteed transmission power of the corresponding cell group ( PxeNB ) due to power scaling or dropping, further power scaling or dropping may not be performed. Good.
- the guaranteed transmission power PxeNB is a parameter defined for each radio base station or cell group, and the radio base station sets the user terminal with higher layer signaling such as RRC.
- the master radio base station MeNB and the secondary radio base station SeNB each grasp at least the guaranteed transmission powers P MeNB and P SeNB of their cell groups. These parameters may be determined by each radio base station that controls each cell group itself, or the master radio base station MeNB collectively determines the guaranteed transmission power for both cell groups, and the secondary radio base station The station SeNB may be notified by backhaul signaling.
- the radio base station determines the maximum allowable transmission power for each CC of the user terminal, the maximum allowable transmission power for each combination of CCs to be transmitted simultaneously, and various parameters used for transmission power control, etc. Information may be exchanged. Furthermore, the radio base stations may exchange not only their guaranteed transmission power but also their mutual guaranteed transmission power by backhaul signaling.
- Setting guaranteed transmission power P XENB is for the radio base station, as long as the required power of the own cell group to the user terminal does not exceed the guaranteed transmission power P XENB, there is an advantage that the user terminal reliably allocate the requested power. For this reason, in dual connectivity, each radio base station controls transmission power independently. However, by appropriately setting guaranteed transmission power PxeNB , at least control for a user terminal regarding a control signal, voice signal, mobility, etc. Necessary power can be assured for information and signals that are indispensable for maintaining and maintaining quality, such as information.
- the radio base station exchanges information such as the allowable maximum transmission power for each CC of the user terminal, the allowable maximum transmission power for each combination of CCs to be transmitted simultaneously, and various parameters used for transmission power control, It is possible to estimate what kind of transmission power control is performed in the radio base station. For example, when the permissible maximum transmission power for each CC of the user terminal is recognized, the maximum transmission power that the user terminal can transmit to the paired radio base station can be estimated.
- the radio base stations exchange not only their own guaranteed transmission power but also each other's guaranteed transmission power, it is possible to perform scheduling in consideration of the other party's guaranteed transmission power.
- the radio base stations MeNB and SeNB can perform power allocation more appropriately by exchanging information on various parameters related to the transmission power control of the user terminal in addition to the guaranteed transmission power PxeNB thereof. It becomes like this.
- the user terminal adds the transmission power for each CC for each cell group, and the sum of the transmission power for each CC does not exceed the guaranteed transmission power P MeNB and P SeNB in each of the master cell group and the secondary cell group. Whether or not the sum of the transmission powers of all CCs in both cell groups does not exceed the maximum allowable transmission power P CMAX can be confirmed at the same time.
- the user terminal checks whether the total transmission power of all CCs exceeds PCMAX as described above, and requests for both cell groups requested at the same timing from the master base station and the secondary base station. If the total power does not exceed the maximum allowable transmission power PCMAX of the user terminal, the requested power is assigned as transmission power without performing power scaling or dropping. On the other hand, when the sum of the required powers of both cell groups requested from the master base station and the secondary base station at the same timing exceeds the allowable maximum transmission power P CMAX of the user terminal, power scaling and dropping are performed to transmit power Is controlled to be less than or equal to the allowable maximum transmission power PCMAX . Note that power scaling and dropping are limited to cell groups that require transmission power that exceeds guaranteed power.
- the user terminal determines whether the total transmission power for each CC does not exceed the guaranteed transmission powers P MeNB and P SeNB , and transmission of all CCs in both cell groups. It is confirmed whether the total power does not exceed the maximum allowable transmission power PCMAX . In the example shown in FIG. 4A, since the total required power of the master cell group and the secondary cell group does not exceed the allowable maximum transmission power P CMAX of the user terminal, the user terminal transmits the required power of the master cell group and the secondary cell group to the transmission power. Assign as.
- the following power guaranteed transmission power P MeNB from the master base station is requested, power exceeding a guaranteed transmission power P SeNB from the secondary base station is requested.
- the user terminal determines whether the total transmission power for each CC does not exceed the guaranteed transmission powers P MeNB and P SeNB , and transmission of all CCs in both cell groups. It is confirmed whether the total power does not exceed the maximum allowable transmission power PCMAX .
- the user terminal since the total required power of the master cell group and the secondary cell group does not exceed the allowable maximum transmission power P CMAX of the user terminal, the user terminal transmits the required power of the master cell group and the secondary cell group to the transmission power. Assign as.
- the master base station requests power equal to or lower than the guaranteed transmission power P MeNB
- the secondary base station requests power exceeding the guaranteed transmission power P SeNB
- the user terminal determines whether the total transmission power for each CC does not exceed the guaranteed transmission powers P MeNB and P SeNB , and transmission of all CCs in both cell groups. It is confirmed whether the total power does not exceed the maximum allowable transmission power PCMAX . In this case, since the sum of the transmission power of all CCs in both cell groups exceeds the allowable maximum transmission power PCMAX , the user terminal applies power scaling or dropping.
- the user The terminal allocates the required power as transmission power to the master cell group, and assigns the remaining power (the surplus power obtained by subtracting the transmission power of the master cell group from the allowable maximum transmission power PCMAX ) to the secondary cell group. assign.
- the user terminal regards the remaining power as the allowable maximum transmission power for the secondary cell group, and applies power scaling or dropping to the secondary cell group.
- the rules for power scaling and dropping include Rel.
- the rules defined in 10/11 can also be applied.
- Rel. 10/11 defines rules for power scaling and dropping when the requested transmission power of all CCs exceeds the allowable maximum transmission power P CMAX per user terminal when there are simultaneous transmissions in a plurality of CCs in CA. .
- the remaining power (the surplus power obtained by subtracting the transmission power of the master cell group from the allowable maximum transmission power PCMAX ) is regarded as the allowable maximum transmission power, and the transmission power requested in the cell group can be regarded as the requested transmission power.
- Rel. Power scaling and dropping can be performed according to the rules defined in 10/11. Since these can be realized by the already defined mechanism, the user terminal can be easily realized by diverting the existing mechanism without introducing a new mechanism as a rule for transmission power control, power scaling, and dropping.
- the user terminal determines whether the total transmission power for each CC does not exceed the guaranteed transmission powers P MeNB and P SeNB , and transmission of all CCs in both cell groups. It is confirmed whether the total power does not exceed the maximum allowable transmission power PCMAX . In this case, since the sum of the transmission power of all CCs in both cell groups exceeds the allowable maximum transmission power PCMAX , the user terminal applies power scaling or dropping.
- the user terminal Power scaling or dropping is applied to the master cell group and the secondary cell group, and the transmission power of each cell group is controlled to be equal to or lower than the guaranteed transmission power P MeNB and the guaranteed transmission power P SeNB .
- Rel the rules of power scaling and dropping for both cell groups.
- the user terminal regards the guaranteed transmission powers P MeNB and P SeNB as the allowable maximum transmission power of each cell group, calculates the required power in each cell group, and determines the Rel. What is necessary is just to control so that the transmission power in each cell group may be equal to or less than the guaranteed transmission power P MeNB or P SeNB by applying power scaling and dropping based on the rules defined in 10/11.
- the user terminal may not be able to recognize the required power required for uplink transmission to the cell group at the subsequent timing at the start of uplink transmission to the cell group at the preceding timing.
- the user terminal performs transmission power control by regarding the guaranteed transmission power PxeNB as the maximum transmission power per radio base station or cell group.
- the guaranteed transmission power is set to be exclusive between cell groups, that is, P MeNB + P SeNB ⁇ P CMAX . Therefore, even in the case of asynchronous dual connectivity in which it is difficult for the user terminal to appropriately allocate power between the cell groups, the transmission timing is determined by setting the guaranteed transmission power P x eNB to the maximum allowable transmission power for each cell group. Thus, it is possible to appropriately perform power control without affecting each other's transmission power between different cell groups.
- the user terminal cannot recognize the required power at the subsequent timing at the preceding timing.
- power exceeding the guaranteed transmission power P SeNB is requested from the secondary base station, and at the subsequent timing, power below the guaranteed transmission power P MeNB is requested from the master base station.
- the user terminal guarantees the required power of the master cell group and allocates the required power as transmission power.
- the user terminal allocates the power scaled with the guaranteed transmission power P SeNB as the maximum transmission power as the transmission power of the secondary base station.
- the user terminal guarantees power allocation for the requested power equal to or lower than the guaranteed transmission power PxeNB regardless of whether it is synchronous, asynchronous, radio base station or other cell group.
- the requested power exceeds the guaranteed transmission power PxeNB
- the requested power is assigned as the transmission power only when it can be determined that the user terminal can be assigned.
- the user terminal can allocate power exceeding the guaranteed transmission power PxeNB .
- this include the case where only one of the cell groups has transitioned to the DRX state, the case where at least one of the cell groups is TDD, and the like.
- uplink data transmission does not occur in that cell group.
- one cell group is TDD, uplink transmission does not occur in the cell in a time period for downlink communication (for example, DL subframe or Special subframe).
- the user terminal When the user terminal recognizes in advance the timing at which uplink transmission does not occur in this way, it is possible to allocate power exceeding the guaranteed transmission power even for asynchronous dual connectivity. Further, in such a case, the user terminal checks whether the sum of transmission powers of all CCs exceeds PCMAX at an arbitrary timing, as in synchronous dual connectivity, and at the same timing from the master base station and the secondary base station. When the total required power of both requested cell groups does not exceed the allowable maximum transmission power PCMAX of the user terminal, it is possible to assign the required power as transmission power without performing power scaling or dropping.
- Guarantee transmission power may be set to be smaller than the allowable maximum transmission power P CMAX user terminal sum of P MeNB and P SeNB.
- a non-guaranteed power region in which power allocation is not guaranteed for any radio base station occurs.
- power is not guaranteed to each radio base station, but power is assigned according to a priority different from that of the guaranteed power region.
- the remaining non-guaranteed power obtained by distributing the respective guaranteed power to each radio base station may be distributed according to the channel and signal priority of each radio base station.
- the priority of the channel and the signal may be, for example, MCG PUCCH> SCG PUCCH> MCG PUSCH> SCG PUSCH.
- the priority of channels and signals may be, for example, MCG SR> SCG SR> MCG HARQ-ACK> SCG HARQ-ACK> MCG data> SCG data> MCG CQI> SCG CQI.
- the priority of channels and signals is not limited to this.
- the non-guaranteed power region is generated because the sum of the guaranteed transmission powers P MeNB and P SeNB is set to be smaller than the allowable maximum transmission power P CMAX of the user terminal. .
- From the master base station is required power exceeding a guaranteed transmission power P MeNB, the power exceeding a guaranteed transmission power P SeNB being requested from the secondary base station.
- the user terminal scales the transmission power or drops the signal according to the channel and signal type of each radio base station, and assigns non-guaranteed power to each radio base station as transmission power.
- Dual connectivity allows carrier aggregation within a radio base station or cell group.
- setting or releasing (configure / removal) of CC is instructed by RRC signaling.
- activation or deactivation of CC is instructed by MAC signaling.
- the radio base station can also instruct the user terminal to deactivate by setting a deactivation timer in the MAC layer.
- FIG. 7A shows an example in which all cells (cells C1 to C5) are in an active state.
- FIG. 7B shows an example in which the SCell (cell C2) of the master cell group (MCG) and one SCell (cell C4) of the secondary cell group (SCG) are in an inactive state.
- the transmission power per cell group that the radio base station wants to guarantee may vary depending on the number of cells in the active state. In this case, if RRC signaling for setting guaranteed transmission power PxeNB is performed at the same frequency as active control by the MAC layer, overhead and delay increase, and throughput decreases.
- the present inventors have a configuration in which the radio base station sets the guaranteed transmission power PxeNB for each cell (CC) and notifies the user terminal about the user terminal operation at the time of setting the guaranteed power in the dual connectivity. I found. According to this method, an appropriate guaranteed transmission power can be set according to the number of cells in the active state.
- a 1st aspect demonstrates the structure which a radio base station notifies the value of guaranteed transmission power PxeNB ( PxeNB, c ) of each cell (CC) to upper layer signaling, such as RRC signaling, to a user terminal.
- PxeNB, c guaranteed transmission power of each cell
- RRC signaling to a user terminal.
- a user terminal calculates
- the radio base station and the user terminal hold a common table in which the value of guaranteed transmission power P xeNB (P xeNB, c ) for each cell (CC) as shown in FIG. 8 is defined.
- the table shown in FIG. 8 shows a case where the master cell group and the secondary cell group are configured by five cells (CC). Based on this table, the user terminal can obtain the guaranteed transmission power P x eNB according to the active cell and the number of cells.
- values of “cell group / radio base station”, “CC index”, “guaranteed transmission power P MeNB, c ” and “guaranteed transmission power P SeNB, c ” are defined.
- the sum of the guaranteed transmission power P xeNB, c for all cells is equal to or less than the allowable maximum transmission power P CMAX of the user terminal. That is, the allowable maximum transmission power P CMAX ⁇ M1 + M2 + S3 + S4 + S5 [dBm] of the user terminal is established.
- the value of guaranteed transmission power P xeNB, c is not an absolute value, and may be a ratio [%] to the allowable maximum transmission power P CMAX , P CMAX_H or P CMAX_L of the user terminal. Allowable maximum transmission power P CMAX is a value selected by the user terminal, P CMAX_H less between subframes, certain variations such that the above P CMAX_L is allowed.
- P CMAX_L is the worst value (minimum value) of the allowable maximum transmission power P CMAX that can be set by the user terminal. Therefore, if you define as the ratio [%] with respect to P CMAX_L, guaranteed transmission power P XENB, the value of c, the value that the user terminal must be able to transmit at any time regardless of the implementation of the user terminal (Minimum requirement) Can be set.
- the SCell (cell C2) in the master cell group (MCG) is additionally activated from the state shown in FIG. 9A.
- the user terminal obtains the guaranteed transmission power P MeNB of the master cell group again based on the table shown in FIG. Since the number of cells in the active state increases and the guaranteed power increases, the non-guaranteed power decreases compared to the state shown in FIG. 9A.
- two SCells (cells C4 and C5) in the secondary cell group (SCG) are additionally activated from the state shown in FIG. 9B. That is, in the state shown in FIG. 9C, all the cells are in the active state.
- the user terminal obtains the guaranteed transmission power P SeNB of the secondary cell group again based on the table shown in FIG. In this example, the sum of the guaranteed transmission power P MeNB and guarantees transmission power P SeNB becomes equal to the allowable maximum transmission power P CMAX of the user terminal, the non-guaranteed power is eliminated.
- the radio base station sets guaranteed transmission power PxeNB ( PxeNB, c ) for each cell (CC), and notifies the user terminal, so that the user terminal appropriately sets the guaranteed power according to the number of cells in the active state. it can.
- PxeNB, c guaranteed transmission power
- PxeNB, c guaranteed transmission power
- the user terminal When there are few cells in the active state, it is not necessary to guarantee a large amount of power, so that non-guaranteed power can be generated.
- Non-guaranteed power is power available to a particular or all base stations. However, the non-guaranteed power is power that is not guaranteed by any base station, and thus there is a possibility that the user terminal does not allocate power depending on the situation.
- the master base station and the secondary base station may hold the table illustrated in FIG. 8 in common, the master base station only has a row related to the master cell group (MCG), the secondary base station has the secondary cell group ( Only rows related to (SCG) may be held. In the case of holding in common, scheduling can be performed in consideration of power guaranteed by both cell groups, and efficient power allocation can be expected. If only the relevant rows of each cell group are kept, it is not necessary to signal all the elements of the table, so that a reduction in overhead can be expected.
- MCG master cell group
- SCG secondary cell group
- the table does not have to hold the guaranteed transmission power of all configured CCs.
- a table having no row for the SCell of CC index # 5 may be held.
- the radio base station and the user terminal hold a common table in which the value of guaranteed transmission power P xeNB (P xeNB, c ) for each cell or combination of cells as shown in FIG. 10 is defined.
- Cell 1 (PCell) belonging to the master cell group (MCG) and cell 3 (PSCell) belonging to the secondary cell group (SCG) are always in an active state and never become inactive.
- the value of guaranteed transmission power PxeNB, c is not an absolute value, and may be a ratio [%] to the allowable maximum transmission power P CMAX , P CMAX_H or P CMAX_L of the user terminal, as in the first mode.
- the SCell (cell C2) in the master cell group (MCG) is additionally activated from the state shown in FIG. 11A.
- the sum of the guaranteed transmission power P MeNB and guarantees transmission power P SeNB becomes equal to the allowable maximum transmission power P CMAX of the user terminal, the non-guaranteed power is eliminated.
- non-guaranteed power can be reduced as compared with the case where the table in the first aspect is used (see FIGS. 9 and 11). Therefore, even when the number of active cells is small, large guaranteed power can be allocated to the radio base station or the cell group.
- the master base station and the secondary base station may hold the table illustrated in FIG. 10 in common, the master base station only has a row related to the master cell group (MCG), the secondary base station has the secondary cell group ( Only rows related to (SCG) may be held.
- MCG master cell group
- SCG secondary cell group
- scheduling can be performed in consideration of power guaranteed by both cell groups, and efficient power allocation can be expected. If only the relevant rows of each cell group are kept, it is not necessary to signal all the elements of the table, so that a reduction in overhead can be expected.
- the table does not have to hold the guaranteed transmission power of all configured CCs.
- a table having no rows for CC index # 3 + # 5 and CC index # 3 + # 4 + # 5 may be held.
- a 3rd aspect demonstrates the structure which a user terminal reports PHR (Power HeadRoom) with respect to a wireless base station in connection with activation or deactivation of SCell.
- PHR Power HeadRoom
- PCell (cell C1) and SCell (cell C2) are active in the master cell group (MCG), and only the special SCell (cell C3) is active in the secondary cell group (SCG).
- MCG master cell group
- SCell SCell
- SCG secondary cell group
- PCell (cell C1) and SCell (cell C2) are active in the master cell group (MCG), and Special SCell (cell C3) and SCell (cells C4 and C5) in the secondary cell group (SCG). Is active.
- MCG master cell group
- SCG secondary cell group
- the state shown in FIG. 12B is obtained.
- the state shown in FIG. 12A is obtained.
- the area of the guaranteed transmission power P SeNB of the secondary base station or the non-guaranteed power area of the secondary base group exists in the area exceeding the guaranteed transmission power P MeNB as seen from the master base station. Depends on active or inactive state.
- the user terminal reports PHR (Power HeadRoom) to all radio base stations when the SCell is activated or deactivated. Since the PHR has a flag bit indicating which cell is active, each radio base station can grasp which cell is active.
- the cell activation is triggered by an activation instruction by MAC signaling from the radio base station.
- Cell deactivation is triggered by expiration of a deactivation timer (De-activation time) or a deactivation instruction by MAC signaling from a radio base station.
- the master base station MeNB activates the SCell (# 2).
- the user terminal reports the PHR to the master base station MeNB and the secondary base station SeNB.
- the master base station MeNB and the secondary base station SeNB grasp each other's guaranteed transmission powers P MeNB and P SeNB , grasp how much non-guaranteed power is present, and independently control the transmission power.
- the master base station MeNB and the secondary base station SeNB grasp that the non-guaranteed power has decreased compared to the previous stage in which the PCell (# 1) and PSCell (# 3) were in the active state.
- the master base station MeNB deactivates the SCell (# 2).
- the user terminal reports the PHR to the master base station MeNB and the secondary base station SeNB.
- the master base station MeNB and the secondary base station SeNB grasp each other's guaranteed transmission powers P MeNB and P SeNB , grasp how much non-guaranteed power is present, and independently control the transmission power.
- the master base station MeNB and the secondary base station SeNB grasp that the non-guaranteed power has increased compared to the previous stage in which the PCell (# 1), SCell (# 2), and PSCell (# 3) were active.
- the secondary base station SeNB activates the SCell (# 4, # 5).
- the user terminal reports the PHR to the master base station MeNB and the secondary base station SeNB.
- the master base station MeNB and the secondary base station SeNB grasp each other's guaranteed transmission powers P MeNB and P SeNB , grasp how much non-guaranteed power is present, and independently control the transmission power.
- the master base station MeNB and the secondary base station SeNB grasp that the non-guaranteed power has decreased as compared to the previous stage in which the PCell (# 1) and PSCell (# 3) were active.
- the user terminal can perform active / inactive control so as to effectively use power by reporting the PHR to the radio base station when the SCell is activated or deactivated. Become.
- the radio base station can grasp the active state of other radio base stations appropriately and with low delay, and can appropriately control the transmission power according to the traffic and the remaining transmission power of the user terminal. For example, it is possible to recognize that the number of cells in the active state of other radio base stations has decreased, and to activate the cell of the own base station additionally. Additional activation increases the guaranteed power of its own base station, but the user terminal reports the PHR as a result of activation, so that the guaranteed power of its own base station has increased to other radio base stations Can do. For example, it is possible to grasp that the number of cells in the active state of other radio base stations has increased, and limit allocation of guaranteed power or more to the cells of the own base station.
- LTE Rel. 12 for eIMTA (enhanced Interference Management and Traffic Adaptation) or Dynamic TDD, subframes are divided into subframe sets and transmission power control is independently performed. Even in a cell belonging to a master base station or a secondary base station in dual connectivity, transmission power control for each subframe set may be performed.
- the necessary transmission power may differ for each subframe set. Therefore, when the transmission power control function for each subframe set for eITMA is used, it is not preferable that the guaranteed transmission power P x eNB has one value.
- the guaranteed transmission power P MeNB, 1 or P SeNB, 1 is set for the subframe set 1
- the guaranteed transmission power P MeNB, 2 or P SeNB, 2 is set for the subframe set 2.
- FIG. 14 is a schematic configuration diagram showing an example of a radio communication system according to the present embodiment.
- the radio communication system 1 is in a cell formed by a plurality of radio base stations 10 (11 and 12) and each radio base station 10, and is configured to be able to communicate with each radio base station 10.
- Each of the radio base stations 10 is connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the radio base station 11 is composed of, for example, a macro base station having a relatively wide coverage, and forms a macro cell C1.
- the radio base station 12 is configured by a small base station having local coverage, and forms a small cell C2.
- the number of radio base stations 11 and 12 is not limited to the number shown in FIG.
- the same frequency band may be used, or different frequency bands may be used.
- the radio base stations 11 and 12 are connected to each other via an inter-base station interface (for example, optical fiber, X2 interface).
- the user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- the user terminal 20 can execute communication with other user terminals 20 via the radio base station 10.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a downlink control channel (PDCCH: Physical Downlink Control Channel, EPDCCH: Enhanced Physical Downlink Control Channel). ), A broadcast channel (PBCH) or the like is used.
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- PBCH broadcast channel
- DCI Downlink control information
- an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), or the like is used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data and higher layer control information are transmitted by PUSCH.
- FIG. 15 is an overall configuration diagram of the radio base station 10 according to the present embodiment.
- the radio base station 10 includes a plurality of transmission / reception antennas 101 for MIMO transmission, an amplifier unit 102, a transmission / reception unit (transmission unit and reception unit) 103, a baseband signal processing unit 104, A call processing unit 105 and an interface unit 106 are provided.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the interface unit 106.
- the baseband signal processing unit 104 performs PDCP layer processing, user data division / combination, RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse
- Each transmission / reception unit 103 converts the downlink signal output from the baseband signal processing unit 104 by precoding for each antenna to a radio frequency band.
- the amplifier unit 102 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 101.
- the transmitter / receiver 103, a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical field according to the present invention can be applied.
- the radio frequency signal received by each transmitting / receiving antenna 101 is amplified by the amplifier unit 102, frequency-converted by each transmitting / receiving unit 103, converted into a baseband signal, and sent to the baseband signal processing unit 104. Entered.
- the transmission / reception unit 103 performs guaranteed transmission power value PxeNB for each cell belonging to the own cell group or a guaranteed transmission power value PxeNB for each combination of cells and multiple cells and active / inactive cells in the own cell group with respect to the user terminal Send information. Each transmitting / receiving unit 103 receives power headroom from the user terminal.
- the baseband signal processing unit 104 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing on user data included in the input uplink signal.
- the data is transferred to the higher station apparatus 30 via the interface unit 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the interface unit 106 transmits / receives a signal (backhaul signaling) to / from an adjacent radio base station via an inter-base station interface (for example, optical fiber, X2 interface). Alternatively, the interface unit 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- a signal backhaul signaling
- inter-base station interface for example, optical fiber, X2 interface
- FIG. 16 is a main functional configuration diagram of the baseband signal processing unit 104 included in the radio base station 10 according to the present embodiment.
- the baseband signal processing unit 104 included in the radio base station 10 includes a control unit 301, a downlink control signal generation unit 302, a downlink data signal generation unit 303, a mapping unit 304, and a demapping unit. 305, a channel estimation unit 306, an uplink control signal decoding unit 307, an uplink data signal decoding unit 308, and a determination unit 309 are included.
- the control unit 301 controls scheduling of downlink user data transmitted on the PDSCH, downlink control information transmitted on both or either of the PDCCH and the extended PDCCH (EPDCCH), downlink reference signals, and the like. In addition, the control unit 301 also performs scheduling control (allocation control) of RA preambles transmitted on the PRACH, uplink data transmitted on the PUSCH, uplink control information transmitted on the PUCCH or PUSCH, and uplink reference signals. Information related to allocation control of uplink signals (uplink control signals, uplink user data) is notified to the user terminal 20 using downlink control signals (DCI).
- DCI downlink control signals
- the control unit 301 controls allocation of radio resources to the downlink signal and the uplink signal based on the instruction information from the higher station apparatus 30 and the feedback information from each user terminal 20. That is, the control unit 301 has a function as a scheduler. A controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention can be applied to the control unit 301.
- the downlink control signal generation unit 302 generates a downlink control signal (both PDCCH signal and EPDCCH signal or one of them) whose assignment is determined by the control unit 301. Specifically, the downlink control signal generation unit 302 receives a downlink assignment for notifying downlink signal allocation information and an uplink grant for notifying uplink signal allocation information based on an instruction from the control unit 301. Generate. A signal generator or a signal generation circuit described based on common recognition in the technical field according to the present invention can be applied to the downlink control signal generation unit 302.
- the downlink data signal generation unit 303 generates a downlink data signal (PDSCH signal) determined to be allocated to resources by the control unit 301.
- the data signal generated by the downlink data signal generation unit 303 is subjected to an encoding process and a modulation process according to an encoding rate and a modulation scheme determined based on CSI from each user terminal 20 or the like.
- the mapping unit 304 allocates the downlink control signal generated by the downlink control signal generation unit 302 and the downlink data signal generated by the downlink data signal generation unit 303 to radio resources. Control.
- a mapping circuit or mapper described based on common recognition in the technical field according to the present invention can be applied to the mapping unit 304.
- the demapping unit 305 demaps the uplink signal transmitted from the user terminal 20 and separates the uplink signal.
- Channel estimation section 306 estimates the channel state from the reference signal included in the received signal separated by demapping section 305, and outputs the estimated channel state to uplink control signal decoding section 307 and uplink data signal decoding section 308.
- the uplink control signal decoding unit 307 decodes a feedback signal (such as a delivery confirmation signal) transmitted from the user terminal through the uplink control channel (PRACH, PUCCH) and outputs the decoded signal to the control unit 301.
- Uplink data signal decoding section 308 decodes the uplink data signal transmitted from the user terminal through the uplink shared channel (PUSCH), and outputs the decoded signal to determination section 309.
- the determination unit 309 performs retransmission control determination (A / N determination) based on the decoding result of the uplink data signal decoding unit 308 and outputs the result to the control unit 301.
- FIG. 17 is an overall configuration diagram of the user terminal 20 according to the present embodiment.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit (transmission unit and reception unit) 203, a baseband signal processing unit 204, an application Unit 205.
- radio frequency signals received by a plurality of transmission / reception antennas 201 are each amplified by an amplifier unit 202, converted in frequency by a transmission / reception unit 203, and converted into a baseband signal.
- the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 204.
- downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- the transmitter / receiver 203 may be a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical field according to the present invention.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 retransmission control (HARQ: Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing, and the like are performed and transferred to each transmission / reception unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band. Thereafter, the amplifier unit 202 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 201.
- the transmission / reception unit 203 receives the value of the guaranteed transmission power PxeNB for each CC or the value of the guaranteed transmission power PxeNB for each cell combination indicated by higher layer signaling such as RRC signaling from the radio base station 10.
- the transmission / reception unit 203 receives CC configuration / removal information indicated by higher layer signaling such as RRC signaling from the radio base station 10.
- the transmission / reception unit 203 receives CC activation / deactivation information instructed by MAC signaling from the radio base station 10.
- FIG. 18 is a main functional configuration diagram of the baseband signal processing unit 204 included in the user terminal 20.
- the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, an uplink control signal generation unit 402, an uplink data signal generation unit 403, a mapping unit 404, and a demapping unit 405.
- the control unit 401 determines the uplink control signal (A / N signal, etc.) and the uplink data signal. Control generation.
- the downlink control signal received from the radio base station is output from the downlink control signal decoding unit 407, and the retransmission control determination result is output from the determination unit 409.
- a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention is applied to the control unit 401.
- Control unit 401 controls the number of cells in the active state, guaranteed transmission power value P XENB per cell, P XENB for each combination of c or cells, using a c, a guaranteed transmission power value P XENB cell group Functions as a power control unit.
- the uplink control signal generation unit 402 generates an uplink control signal (feedback signal such as a delivery confirmation signal or channel state information (CSI)) based on an instruction from the control unit 401.
- Uplink data signal generation section 403 generates an uplink data signal based on an instruction from control section 401.
- the control unit 401 instructs the uplink data signal generation unit 403 to generate an uplink data signal when the downlink grant is included in the downlink control signal notified from the radio base station.
- a signal generator or a signal generation circuit described based on common recognition in the technical field according to the present invention can be applied to the uplink control signal generation unit 402.
- the mapping unit 404 controls allocation of uplink control signals (delivery confirmation signals and the like) and uplink data signals to radio resources (PUCCH, PUSCH) based on an instruction from the control unit 401.
- the demapping unit 405 demaps the downlink signal transmitted from the radio base station 10 and separates the downlink signal.
- Channel estimation section 406 estimates the channel state from the reference signal included in the received signal separated by demapping section 405, and outputs the estimated channel state to downlink control signal decoding section 407 and downlink data signal decoding section 408.
- the downlink control signal decoding unit 407 decodes the downlink control signal (PDCCH signal) transmitted on the downlink control channel (PDCCH), and outputs scheduling information (allocation information to uplink resources) to the control unit 401.
- the downlink control signal includes information on a cell that feeds back a delivery confirmation signal and information on whether or not RF adjustment is applied, the downlink control signal is also output to the control unit 401.
- the downlink data signal decoding unit 408 decodes the downlink data signal transmitted through the downlink shared channel (PDSCH), and outputs the decoded signal to the determination unit 409.
- the determination unit 409 performs retransmission control determination (A / N determination) based on the decoding result of the downlink data signal decoding unit 408 and outputs the result to the control unit 401.
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Abstract
Description
第1の態様では、無線基地局が、ユーザ端末に、RRCシグナリングなどの上位レイヤシグナリングにより各セル(CC)の保証送信電力PxeNB(PxeNB,c)の値を通知する構成について説明する。ユーザ端末は、アクティブ状態のセルとセル数に応じて保証送信電力PxeNBを求める。
PSeNB=10log10{10(S3/10)+10(S5/10)}[dBm]
と求まる。
第1の態様で示したように、セルごとに保証送信電力PxeNBを設定した場合、セルグループ内に設定されたセル数に対してアクティブ状態のセル数が少ないと非保証電力が生じる。これに対して、アクティブ状態のセル数によらず、できるだけ多くの電力を保証電力として利用したいというニーズがある。そこで、第2の態様では、アクティブ状態のセルの組み合わせごとに保証送信電力PxeNBを設定する構成について説明する。
第3の態様では、ユーザ端末が、SCellのアクティブ化または非アクティブ化に伴って、無線基地局に対してPHR(Power HeadRoom)を報告する構成について説明する。
LTE Rel.12では、eIMTA(enhanced Interference Management and Traffic Adaptation)またはDynamic TDD向けとして、サブフレームをサブフレームセットに分割し、独立に送信電力制御を行うことが検討されている。デュアルコネクティビティにおけるマスタ基地局またはセカンダリ基地局に属するセルでも、サブフレームセットごとの送信電力制御が行われる可能性がある。
以下、本実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上述の送信電力制御を行う無線通信方法が適用される。
Claims (9)
- 異なる周波数を利用する1つ以上のセルからそれぞれ構成される複数のセルグループと通信を行うユーザ端末であって、
前記セルごとの保証送信電力値および前記セルグループにおけるセルのアクティブ・非アクティブ情報を受信する受信部と、
前記アクティブ状態のセル数と、前記セルごとの保証送信電力値とを用いて、前記セルグループの保証送信電力値を制御する電力制御部と、を有することを特徴とするユーザ端末。 - 異なる周波数を利用する1つ以上のセルからそれぞれ構成される複数のセルグループと通信を行うユーザ端末であって、
前記セルおよび複数セルの組み合わせごとの保証送信電力値および前記セルグループにおけるセルのアクティブ・非アクティブ情報を受信する受信部と、
前記アクティブ状態のセル数と、前記セルおよび複数セルの組み合わせごとの保証送信電力値とを用いて、前記セルグループの保証送信電力値を制御する電力制御部と、を有することを特徴とするユーザ端末。 - 前記セルグループの保証送信電力値を、自端末の許容最大送信電力に対する比率に基づいて制御することを特徴とする請求項1または請求項2に記載のユーザ端末。
- 前記セルの非アクティブ情報を受信した際に、前記セルグループを形成する複数の無線基地局に対してパワーヘッドルームを送信する送信部を有することを特徴とする請求項1または請求項2に記載のユーザ端末。
- 前記電力制御部は、前記セルがサブフレームセットに分けられる場合、前記サブフレームセットごとに保証送信電力値を制御することを特徴とする請求項1または請求項2に記載のユーザ端末。
- 前記セルごとの保証送信電力値は、上位レイヤシグナリングで設定されることを特徴とする請求項1に記載のユーザ端末。
- 異なる周波数を利用する1つ以上のセルからそれぞれ構成されるセルグループを形成し、前記セルグループと異なるセルグループを形成する他の無線基地局とデュアルコネクティビティを適用してユーザ端末と通信する無線基地局であって、
前記ユーザ端末に対して自セルグループに属するセルごとの保証送信電力値または前記セルおよび複数セルの組み合わせごとの保証送信電力値ならびに前記自セルグループにおけるセルのアクティブ・非アクティブ情報を送信する送信部を有することを特徴とする無線基地局。 - 異なる周波数を利用する1つ以上のセルからそれぞれ構成されるセルグループを形成し、前記セルグループと異なるセルグループを形成する他の無線基地局とデュアルコネクティビティを適用して無線基地局がユーザ端末と通信する無線通信システムであって、
前記無線基地局は、
前記ユーザ端末に対して自セルグループに属するセルごとの保証送信電力値および前記自セルグループにおけるセルのアクティブ・非アクティブ情報を送信する送信部を有し、
前記ユーザ端末は、
前記セルごとの保証送信電力値および前記セルグループにおけるセルのアクティブ・非アクティブ情報を受信する受信部と、
前記アクティブ状態のセル数と、前記セルごとの保証送信電力値とを用いて、前記セルグループの保証送信電力値を制御する電力制御部と、を有することを特徴とする無線通信システム。 - 異なる周波数を利用する1つ以上のセルからそれぞれ構成される複数のセルグループと通信を行うユーザ端末の無線通信方法であって、
前記セルごとの保証送信電力値および前記セルグループにおけるセルのアクティブ・非アクティブ情報を受信する工程と、
前記アクティブ状態のセル数と、前記セルごとの保証送信電力値とを用いて、前記セルグループの保証送信電力値を制御する工程と、を有することを特徴とする無線通信方法。
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Cited By (4)
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WO2018094408A1 (en) * | 2016-11-21 | 2018-05-24 | Qualcomm Incorporated | Power headroom reporting for systems with multiple transmission time intervals |
WO2018229837A1 (ja) * | 2017-06-12 | 2018-12-20 | 株式会社Nttドコモ | ユーザ端末及び無線通信方法 |
WO2019030904A1 (ja) * | 2017-08-10 | 2019-02-14 | 富士通株式会社 | 端末装置、基地局装置、無線通信システム及び無線通信方法 |
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WO2018173438A1 (ja) * | 2017-03-22 | 2018-09-27 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | 端末及び通信方法 |
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US10863450B2 (en) * | 2018-07-25 | 2020-12-08 | Qualcomm Incorporated | Power control in NR-NR dual connectivity |
US11356962B2 (en) * | 2019-01-07 | 2022-06-07 | Qualcomm Incorporated | Power control in NR-NR dual connectivity |
WO2020144817A1 (ja) * | 2019-01-10 | 2020-07-16 | 株式会社Nttドコモ | ユーザ装置及び電力削減方法 |
US11589403B2 (en) * | 2019-02-25 | 2023-02-21 | Qualcomm Incorporated | Uplink power control prioritization in dual connectivity |
US11432250B2 (en) * | 2019-06-27 | 2022-08-30 | Qualcomm Incorporated | Transmission power control |
EP4197256A4 (en) * | 2020-08-17 | 2024-05-01 | Qualcomm Inc | BEAM MANAGEMENT FOR A SECONDARY CELL GROUP IN RESTING STATE |
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- 2015-05-27 WO PCT/JP2015/065160 patent/WO2016002393A1/ja active Application Filing
- 2015-05-27 CN CN201580035510.5A patent/CN106465298A/zh active Pending
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Cited By (8)
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US11856523B2 (en) | 2014-01-29 | 2023-12-26 | Interdigital Patent Holdings, Inc. | Uplink transmissions in wireless communications |
WO2018094408A1 (en) * | 2016-11-21 | 2018-05-24 | Qualcomm Incorporated | Power headroom reporting for systems with multiple transmission time intervals |
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WO2018229837A1 (ja) * | 2017-06-12 | 2018-12-20 | 株式会社Nttドコモ | ユーザ端末及び無線通信方法 |
WO2019030904A1 (ja) * | 2017-08-10 | 2019-02-14 | 富士通株式会社 | 端末装置、基地局装置、無線通信システム及び無線通信方法 |
JPWO2019030904A1 (ja) * | 2017-08-10 | 2019-11-07 | 富士通株式会社 | 端末装置、基地局装置、無線通信システム及び無線通信方法 |
US10772047B2 (en) | 2017-08-10 | 2020-09-08 | Fujitsu Limited | Transmission power sharing between dual connectivity cell groups |
Also Published As
Publication number | Publication date |
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JP6585043B2 (ja) | 2019-10-02 |
US20170142668A1 (en) | 2017-05-18 |
JPWO2016002393A1 (ja) | 2017-04-27 |
CN106465298A (zh) | 2017-02-22 |
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