WO2015194553A1 - Station de base radio, appareil de commande et station mobile - Google Patents

Station de base radio, appareil de commande et station mobile Download PDF

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Publication number
WO2015194553A1
WO2015194553A1 PCT/JP2015/067310 JP2015067310W WO2015194553A1 WO 2015194553 A1 WO2015194553 A1 WO 2015194553A1 JP 2015067310 W JP2015067310 W JP 2015067310W WO 2015194553 A1 WO2015194553 A1 WO 2015194553A1
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Prior art keywords
base station
cell
radio
usage rate
radio base
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PCT/JP2015/067310
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English (en)
Japanese (ja)
Inventor
基樹 森田
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日本電気株式会社
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Priority to JP2016529374A priority Critical patent/JPWO2015194553A1/ja
Publication of WO2015194553A1 publication Critical patent/WO2015194553A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks

Definitions

  • the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2014-124353 (filed on June 17, 2014), the entire description of which is incorporated herein by reference. Shall.
  • the present invention relates to uplink transmission power control in a radio communication system including a radio base station, a control apparatus, and a mobile station.
  • This ultra-small base station is called a femtocell base station (or HeNB (Home eNodeB)), and its communication area is called a femtocell.
  • Femtocell base stations are installed not only as a means of accommodating the above-mentioned high demand traffic, but also in places where macro base station radio waves such as high floors of buildings and underground shopping streets are difficult to reach due to their small size. Therefore, it is attracting attention as a means for expanding the coverage (communication area satisfying the required quality).
  • a mobile station that communicates by connecting to a femtocell base station is referred to as a “femtocell mobile station (or HUE (Home User Equipment))”, and a mobile station that communicates by connecting to a macro base station.
  • a station is called a “macro mobile station (or MUE (Macro User Equipment))”.
  • Wireless communication standards applied to femtocell base stations include W-CDMA (Wideband Code Division Multiple Access) specified by 3GPP (3rd Generation Partnership Project) and its successor LTE (Long Term Evolution).
  • LTE Long Term Evolution
  • a radio frequency band in one subframe (1 msec) is subdivided into small units called resource blocks (PRBs), and a scheduler provided in a base station transmits a plurality of PRBs to a mobile station of a communication partner.
  • PRB with good reception quality is assigned from among them.
  • the configuration of the PRB in LTE is shown in FIG. 1, taking the uplink from the mobile station to the base station as an example.
  • PRBs at both ends are used as control channels (PUCCH: Physical Uplink Control Channel) in the system band, and other central PRBs are data channels (PUSCH: Physical Uplink Shared Channel) that transmit user data. ).
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the PUCCH is a data channel success / failure (Ack / Nack) for a data channel (PDSCH: Physical Downlink Shared Channel) in a downlink from a base station to a mobile station, channel quality information (CSI: Channel State Information), and a request in uplink scheduling Send information.
  • PDSCH Physical Downlink Shared Channel
  • CSI Channel State Information
  • 1 PRB is allocated per mobile station, and the maximum number of PRBs that can be allocated to mobile stations in the same subframe is defined. For example, when the system band is 10 MHz, 2 PRBs can be used in the same subframe, and therefore up to 2 mobile stations can be allocated. However, in order to obtain the frequency diversity effect, in FIG. 1, 1 PRB is divided into two by 0.5 msec slots, and one mobile station uses different PRBs in the first half and second half slots.
  • the usable 2PRB (PRB pair) is PUCCH format 2, 2a or 2b, up to 12 mobile stations are allocated using cyclic shift parameters 0 to 11 determined for each mobile station. It is possible. If the PUCCH format is format 1, 1a or 1b, up to 36 mobile stations can be allocated using cyclic shift parameters determined for each mobile station and orthogonal sequence indices with values from 0 to 3. (Non-patent Document 3).
  • One of the interference scenarios assumed when using a femtocell base station is a scenario in which a femtocell mobile station causes uplink interference to a macro cell. Specifically, it is interference that uplink transmission of the femtocell mobile station has on uplink reception of the macro base station (in other words, uplink transmission of the macro mobile station).
  • this interference scenario when the uplink frequency band of the femto cell and the macro cell is the same, the smaller the propagation loss between the femto cell base station and the macro base station, the larger the uplink interference power that the femto cell mobile station gives to the macro base station. It becomes a problem.
  • Non-Patent Documents 1 and 2 disclose techniques for suppressing uplink interference from a femto cell to a macro cell.
  • Non-Patent Documents 1 and 2 disclose that the uplink transmission power of the femtocell is controlled in consideration of the propagation loss between the femtocell and the macrocell.
  • the femtocell base station measures the propagation loss between the own base station and the macro base station as the propagation loss between the femtocell and the macrocell. It is disclosed that uplink interference is suppressed by performing transmission power control so that the uplink transmission power of the femtocell mobile station becomes smaller as the propagation loss is smaller.
  • the femtocell base station measures the propagation loss between the femtocell mobile station and the macro base station as the propagation loss between the femtocell and the macrocell.
  • uplink interference is suppressed by performing transmission power control so that the uplink transmission power of a femtocell mobile station is smaller as the propagation loss is smaller.
  • the transmission power control is performed by adjusting the target value of uplink reception power (uplink target reception power) of the femtocell mobile station and the maximum uplink transmission power of the femtocell mobile station in the femtocell base station.
  • These transmission power controls can be applied not only to the PUSCH of the data channel but also to the PUCCH of the control channel.
  • Non-Patent Document 1 and Non-Patent Document 2 can suppress uplink interference per femtocell base station, but control total uplink interference from all femtocell base stations in a macro cell. The total uplink interference increases as the number of femtocell base stations increases.
  • the present invention is not limited to the macro cell and the femto cell, and may be, for example, a relationship between the macro cell and the pico cell or a relationship between the pico cell and the femto cell. Further, it may be a homogeneous network in which cells having the same cover range are arranged. Note that a pico cell refers to a cell that has a smaller coverage than a macro cell and a larger coverage than a femto cell.
  • the present invention has been made based on the above-described knowledge, and an object of the present invention is to provide a radio base station, a control device, and the like that solve the above-described problems.
  • the radio base station is a radio base station that manages at least one cell and performs radio communication with the mobile station in the cell, and performs radio communication with the mobile station.
  • a control device is a control device capable of communicating with at least one or more radio base stations, and performs radio communication in at least one or more cells managed by the radio base station.
  • a mobile station is a mobile station in a radio communication system, and is located in the vicinity of a radio base station that manages a serving cell in which the mobile station is located, and the serving cell
  • At least one of the radio base stations that manage the neighboring cell measures the received power of the reference signal transmitted from the neighboring cell, and transmits it to the radio base station that manages the serving cell, and the radio resources in the serving cell and the neighboring cell
  • the target received power at the radio base station that manages the serving cell which is determined based on the total value of the usage rates, is received.
  • a radio base station is a radio base station that manages at least one cell and performs radio communication with a mobile station in the cell, and performs radio communication with the mobile station.
  • a radio base station is a first radio base station that manages a first cell and performs radio communication with a mobile station in the first cell, the radio base station comprising: Means for calculating a usage rate of radio resources in the first cell by an uplink control channel used for radio communication of: Means for sending a utilization rate of radio resources in the first cell to the network; The usage rate of the radio resource in the second cell managed by the second radio base station, or the second cell managed by the first cell and the second radio base station managed by the first radio base station Means for receiving a total value of the usage rate of radio resources in the cell.
  • a control device is a control device capable of communicating with a plurality of radio base stations, and performs mobile communication in a plurality of cells respectively managed by the plurality of radio base stations.
  • the usage rate of the radio resource of the uplink control channel in each cell is received from the plurality of radio base stations, and the total value of the usage rate of the radio resource in each cell received from the plurality of radio base stations is Notify the radio base station.
  • a mobile station is a mobile station in a radio communication system, and includes a first radio base station that manages a first cell in which the mobile station is located, and a second cell. Radio resources in the first cell and the second cell are measured by measuring the received power of the reference signal transmitted by at least one of the second radio base stations to be managed and transmitting the measured power to the first radio base station. The target received power at the first radio base station, which is determined based on the total value of the usage rates, is received.
  • a radio base station is a first radio base station that manages a first cell and performs radio communication with a mobile station in the first cell, the radio base station comprising: Means for calculating a radio resource usage rate in the first cell by an uplink control channel used for the radio communication, and a signal received from the mobile station based on at least the radio resource usage rate in the first cell Means for setting the target received power.
  • the present invention it is possible to suppress uplink interference from a cell managed by a radio base station in the vicinity of the radio base station.
  • FIG. 2 shows a wireless communication system in the present embodiment.
  • the wireless communication system includes at least one femtocell base station 1, at least one femtocell mobile station 2-1, at least one macro mobile station 2-2, a management server 3, a macro base station 4, and an upper network. 5 is provided.
  • the base station constituting the wireless communication system of the present invention is not limited to the macro base station and the femtocell base station, and may be, for example, a macro base station and a picocell base station, or a picocell base station. And a femtocell base station. Moreover, although it may be base stations in a homogeneous network (Homogeneous Network) in which cells having the same range of coverage are arranged, the following description will be made using a macro base station and a femtocell base station.
  • Homogeneous Network homogeneous Network
  • one or more femtocell mobile stations 2-1 belong to the femtocell base station 1, and whether or not actually communicating is arbitrary.
  • the radio system applied in the radio communication system will be described assuming LTE, but W-CDMA and other radio systems can also be applied.
  • the femtocell base station 1 is described as being always activated, but there is no problem even if the femtocell base station 1 is actually stopped or stopped.
  • at least a part of the PUCCH in the femtocell base station 1 and the PUCCH in the macro base station 4 use PRBs that overlap each other on the frequency axis, and the PUCCHs that interfere with each other are described as overlapping. Even if it is not, the present invention is applicable.
  • the femtocell base station 1 in order to calculate the uplink interference power that the PUCCH transmitted from the femtocell mobile station exerts on the macro base station, the femtocell base station 1 is connected between the femtocell mobile station and the macro base station, and between the femtocell mobile station and Measure propagation loss between base stations.
  • the femtocell base station 1 calculates the usage status (hereinafter, radio resource usage rate) of radio resources in a cell (femtocell) managed by the own station.
  • the above-described PRB corresponds to the radio resource, but is not limited thereto.
  • the radio resource usage rate can be defined as a ratio of an amount of radio resources allocated per unit time to an allocatable amount. For example, the ratio of the number of PRBs assigned per unit time to the number of assignable PRBs can be used as the radio resource usage rate.
  • the radio resource usage rate of the PUCCH (uplink control channel) in the femtocell may be referred to as “radio resource usage rate”.
  • the usage rate of the radio wireless resource used for not only PUCCH but data channels, such as PUSCH, may be calculated, and you may use for the setting of the target received power demonstrated hereafter.
  • the management server 3 calculates the total uplink interference power from a cell that is adjacent to the macro base station 4 or whose coverage is at least partially overlapped, that is, a cell that interferes with the uplink reception power of the PUCCH of the macro base station. Therefore, the PUCCH radio resource usage rates of the cells that cause these interferences are summed, and a total value of radio resource usage rates that can cause interference with the uplink received power of the macro base station is calculated.
  • the management server 3 uses the radio resource usage rate of the PUCCH in the femtocell base station 1 in which the coverage area of the cell (own cell) managed by the own base station is included in one macro cell managed by the macro base station 4. The total value of is calculated.
  • the femtocell base station 1 may calculate the total value of the radio resource usage rate.
  • information on the uplink radio resource usage rate of the cell managed by the own station is transmitted to and received from the nearby femtocell base station.
  • Transmission / reception of uplink radio resource usage rate information may be performed directly between femtocell base stations, or may be performed via the management server 3, the femtocell mobile station 2-1, or the macro mobile station 2-2.
  • the X2 interface can be used for direct transmission / reception between femtocell base stations, and the S1 interface can be used for transmission / reception via the management server 3.
  • the femtocell base station 1 is configured so that the total uplink interference power calculated using at least the total value of the radio resource usage rate is less than or equal to the allowable interference power of the uplink of the macro base station.
  • PUCCH uplink transmission power is set. Specifically, by adjusting the value of the target received power from the femtocell mobile station 2-1 in the femtocell base station 1 using the total value of the radio resource usage rate, the PUCCH of the femtocell mobile station 1 It is possible to set the uplink transmission power to be less than the allowable interference power of the uplink of the macro base station.
  • the total uplink interference power of PUCCH from all femtocell mobile stations in the macro cell to the macro base station can be suppressed to a certain level or less.
  • other parameters such as the above two types of propagation loss can be taken into consideration in addition to the total value of the radio resource usage rate.
  • FIG. 3 is a block diagram showing a configuration of a wireless communication system according to the present invention.
  • the wireless communication system includes a femtocell base station 1, a femtocell mobile station 2-1, a management server 3, and a macro base station 4.
  • the femtocell base station 1 includes a radio communication unit 10, a broadcast information acquisition unit 11, a measurement report acquisition unit 12, a resource usage rate calculation unit 13, a transmission power setting calculation unit 14, and a total resource usage rate acquisition unit 15. .
  • the radio communication unit 10 transmits, to the femtocell mobile station 2-1, a downlink signal in which control information and user data from the upper network 5 are encoded. Further, the radio communication unit 10 receives an uplink signal including control information and user data transmitted by the femtocell mobile station 2-1, and decodes the received data from the uplink signal. Further, the radio communication unit 10 transmits the uplink target received power P H O to the femtocell mobile station 2-1.
  • the broadcast information acquisition unit 11 receives broadcast information broadcasted by the macro base station 4 to the macro mobile station 2-2 in the macro cell via radio, demodulates it, and acquires necessary transmission power information.
  • the acquired transmission power information includes the transmission power P tx_M [dBm] of the downlink reference signal transmitted by the macro base station 4, and the uplink target received power P M O [dBm] used for uplink transmission power control in the macro mobile station 2-2.
  • the broadcast information is preferably received in a network listening mode (hereinafter abbreviated as NLM) that is activated at a predetermined cycle during initial installation or operation.
  • NLM network listening mode
  • the measurement report acquisition unit 12 acquires downlink reference signal received power (RSRP) that is measured by the femtocell mobile station 2-1 and reported to the femtocell base station 1 using a measurement report.
  • the RSRP to be acquired is the RSRP of the femtocell base station 1 (denoted as P rx_H [dBm]) and the RSRP of the macro base station 4 (denoted as P rx_M [dBm]).
  • the resource usage rate calculation unit 13 calculates the PUCCH radio resource usage rate at the femtocell base station used to calculate the uplink interference power from the PUCCH of the femtocell mobile station.
  • the radio resource usage rate means a ratio of the amount of radio resources allocated to the femtocell base station per unit time in the femtocell base station to an allocatable amount, and is calculated as an average index in a predetermined period. As shown in Equation (1), the higher the radio resource usage rate in one femtocell, the higher the uplink interference power from the entire femtocell mobile station in the femtocell.
  • Equation (1) is an equation for obtaining SINR (Signal Interference plus Noise Power Ratio) ⁇ of the macro base station 4.
  • S M is the desired wave power of PUCCH between the macro base station and the macro mobile station
  • I H i is the interference power from the femtocell base station i to the macro base station
  • U H i is the cell managed by the femtocell base station i.
  • Uplink radio resource usage rate, N represents noise power.
  • m represents the total number of femtocell base stations that manage femtocells that are arranged in the same macrocell or that partially overlap the coverage area.
  • the usage rate of the PDSCH resource block (hereinafter abbreviated as PRB) (the number of PRBs used per unit time / the total number of PRBs.
  • PRB the usage rate of the PDSCH resource block
  • the femtocell base station measures the unit time (for example, 1 subframe (1 msec)) and the number of mobile stations in the active mode on the downlink (hereinafter referred to as the number of downlink active mobile stations). Then, the wireless resource usage rate is calculated using these measured values.
  • the mobile station in the active mode means a mobile station where downlink data to be transmitted exists per unit time in the base station. A specific calculation method will be described in detail in step S11 of the operation description.
  • the transmission power setting calculation unit 14 uses the uplink target received power P H O [dBm] used for the uplink transmission power control of the femtocell mobile station so that the total uplink interference power to the PUCCH in the macro base station is equal to or less than the allowable interference power. Calculate At that time, using the transmission power information acquired by the broadcast information acquisition unit 11, the two measurement values acquired by the measurement report acquisition unit 12, and the downlink reference signal transmission power held in advance by the femtocell base station 1, The propagation loss between the femtocell mobile station and the macro base station and between the femtocell mobile station and the own base station is measured.
  • the uplink target received power P H O [dBm] of the femtocell base station 1 is calculated using the total value of the radio resource usage rates acquired by the total resource usage rate acquisition unit 15. Details of the calculation of the uplink target received power P H O will be described later in step S17 in the description of the operation.
  • the total resource usage rate acquisition unit 15 acquires the total value of the radio resource usage rates calculated and reported by the management server 3 and notifies the transmission power setting calculation unit 14 of the total value.
  • the total value of the radio resource usage rate will be described later in the total resource usage rate calculation unit 30 in the management server 3.
  • the present invention considers the sum of the radio resource usage rates (radio resource usage rates) of cells that can interfere with the uplink received power of the base station (here, the macro base station) (total radio resource usage rates),
  • the uplink target received power is set. Therefore, acquisition of broadcast information of the macro base station 4 (broadcast information acquisition unit 11) and acquisition of a measurement report from a femtocell mobile station (measurement report acquisition unit 12) are limited to the setting of the uplink target reception power of the present invention.
  • Measurement report acquisition unit 12 are not necessarily indispensable components in setting the uplink target received power of the present invention.
  • the total resource usage rate acquisition unit 15 is unnecessary, and the transmission power setting calculation unit 14 acquires the radio resource usage rate from the resource usage rate calculation unit 13.
  • the femtocell mobile station 2-1 includes a radio communication unit 20, a reception power measurement unit 21, and a transmission power setting unit 22.
  • the radio communication unit 20 transmits, to the femtocell base station 1-1, an uplink signal in which user data to the upper network 5 generated according to use of control data and applications is encoded.
  • the uplink signal transmitted to the femtocell base station includes RSRP measured by the femtocell mobile station 2-1.
  • the radio communication unit 20 receives a downlink signal transmitted from the femtocell base station 1-1 and decodes received data from the downlink signal. Further, the radio communication unit 20 supplies the uplink target received power P H O received from the femtocell base station 1-1 to the transmission power setting unit 22.
  • Received power measurement unit 21 measures the propagation loss of the femtocell base station 1 of RSRP required to calculate (P rx_H), the macro base station 4 RSRP the (P rx_M). Note that the base stations to be measured (the femtocell base station 1 and the macro base station 4) and the measurement item (RSRP) receive the measurement control message transmitted from the femtocell base station 1 in advance, thereby moving the femtocell. Station 2-1 can grasp.
  • the transmission power setting unit 22 acquires the uplink target received power P H O set and notified by the femtocell base station 1, and sets the uplink transmission power using the acquired P H O.
  • the management server 3 includes a total resource usage rate calculation unit 30 and a total resource usage rate transmission unit 31.
  • the total resource usage rate calculation unit 30 collects the radio resource usage rates reported by each femtocell base station 1, and calculates the total value R1 of the radio resource usage rate as an index of the total uplink interference power of the PUCCH in the macro base station. calculate.
  • the total uplink interference power of the PUCCH in the macro base station increases as the total value of the radio resource usage rate increases. Therefore, when the uplink transmission power is set, the transmission power of the PUCCH is suppressed as the total value of the radio resource usage rate is larger.
  • the total value R1 of radio resource usage rates in the present embodiment is the sum of radio resource usage rates reported from m femtocell base stations 1 existing in the same macro cell.
  • the total value R1 of the calculated radio resource usage rate is notified to the total resource usage rate transmission unit 31.
  • the radio resource usage rate may be the usage amount of the radio resource, and may be an index that reflects the degree of use of the radio resource.
  • the total resource usage rate transmitting unit 31 notifies the total radio resource usage rate R1 calculated by the total resource usage rate calculating unit 30 to all the m femtocell base stations 1 via a wired line.
  • the macro base station 4 includes a broadcast information transmission unit 40.
  • the broadcast information transmitting unit 40 transmits broadcast information to the macro mobile station 2-2 in the macro cell via radio.
  • the information handled in the present embodiment includes the transmission power of the downlink reference signal used for calculating the propagation loss and the uplink target used for the uplink transmission power control of the macro mobile station 2-2. Received power.
  • the resource usage rate calculation unit 13 calculates the PUCCH radio resource usage rate.
  • the calculation operation is performed at a cycle T1 (for example, about 1 minute).
  • the PRSCH usage rate of PDSCH and the number of downlink active mobile stations are used to calculate the PUCCH radio resource usage rate.
  • radio resource usage rate of PUCCH at discrete time k is U H UL, i, k
  • PRB usage rate of PDSCH is U H DL, i, k (takes a value from 0 to 1)
  • the number of downlink active mobile stations is n DLUE, k, i
  • the PUCCH radio resource usage rate is calculated as shown in Equation (2). Note that the sampling period at time k is an integral multiple of the subframe (1 msec).
  • the radio resource usage rate of PUCCH is proportional to the PRB usage rate of PDSCH.
  • the radio resource usage rate of PUCCH is 0.
  • the number of downlink active mobile stations is 1 (equation (B))
  • only 1 PRB is allocated per mobile station for transmission of PUCCH. Therefore, regardless of the PDB PRB usage rate, the upper limit of the PUCCH radio resource usage rate is This is 50% (0.5) of the 2 PRBs that can be allocated.
  • the assignable 2PRB is reused after assigning different codes, so the radio resource usage rate of PUCCH is adjusted accordingly.
  • the radio resource usage rate of PUCCH is increased by using n max in order to suppress the radio resource usage rate of PUCCH to a predetermined value. Suppress. This avoids excessively suppressing the uplink transmission power of PUCCH in the femtocell.
  • an average addition value of PUCCH radio resource usage rates is obtained in period T1 (formula (D), l is the number of samples in period T1). Then, the calculated average radio resource usage rate is reported to the management server 3. Note that.
  • the radio resource usage rate of PUCCH is proportional to the PRB usage rate of PDSCH and its slope is assumed to be 1. However, it may be proportional to a slope smaller than 1 by applying a correction coefficient smaller than 1.
  • step S12 the broadcast information acquisition unit 11 receives the broadcast information of the macro base station 4 using NLM, P tx_M, acquires P M O.
  • This acquisition operation is performed, for example, at the NLM activation cycle T2 (for example, a long cycle of several hours to one day).
  • step S13 the measurement report acquisition section 12 and the femtocell base station 1 of RSRP (P rx_H), obtains the RSRP (P rx_M) of the macro base station 4 from the femtocell mobile station 2-1.
  • This acquisition operation is performed at a predetermined cycle T3 (for example, about 1 sec).
  • step S14 the transmission power setting calculation unit 14 calculates the propagation loss L M [dB] from the femtocell mobile station 2-1 to the macro base station 4 from Equation (3).
  • L M is strictly a propagation loss of a downlink from the macro base station 4 to the femtocell mobile station 2-1, assuming that a large difference is not the frequency used in the uplink and downlink, downlink the propagation loss of the line is assumed to be equal to the propagation loss L M uplink.
  • This calculation is performed at a period T3 that is an acquisition period of RSRP (P rx_M ).
  • step S15 similarly, the transmission power setting calculation unit 14 calculates the propagation loss L H [dB] from the femtocell mobile station 2-1 to the own femtocell base station 1 from the equation (4).
  • L H is strictly a propagation loss of a downlink from a femtocell base station 1 to the femto cell mobile station 2-1, similarly large difference between the frequency used in the uplink and downlink assuming no Te, it is assumed that the propagation loss of the downlink is equal to the propagation loss L H uplink.
  • This calculation is performed at a period T3 that is an acquisition period of RSRP (P rx_H ).
  • step S16 the total resource usage rate acquisition unit 15 acquires the total value R1 of the radio resource usage rate from the management server 3. This acquisition operation is performed at a cycle T4 (for example, about 1 minute), which is equal to the calculation and transmission cycle of the total value of the radio resource usage rate.
  • step S17 by using the various information obtained in step S12, S14, S15, and S16, the transmission power setting calculator 14 sets the uplink target received power P H O.
  • This setting operation is performed when each piece of acquired information is updated.
  • the macro mobile station 2-2 Define an SINR estimate ⁇ [dB] per PRB in PUCCH. Assume that ⁇ satisfies the condition of ⁇ ⁇ ⁇ min . However, ⁇ min [dB] is a parameter corresponding to the SINR of the PUCCH required for the macro mobile station 2-2 to satisfy the predetermined communication quality, and is set in advance. As shown in the equation (1), it is necessary to consider the desired wave power and the interference power when formulating ⁇ .
  • the femtocell mobile station 2 belonging to the femtocell base station 1 of interest is used.
  • I H [dBm] the interference power
  • the PUCCH of ⁇ 1 gives to the PUCCH of the macro base station 4 and the contributions of other femtocell mobile stations in the same macro cell.
  • different PRBs are used between macro mobile stations in the same macro cell, and therefore interference from other macro mobile stations in the same macro cell can be assumed to be zero.
  • the macro mobile station and the femto cell mobile station in another macro cell are relatively sufficiently separated from each other, and interference from them is negligible as compared with I H or the like.
  • ⁇ is approximately
  • Equation (5) is obtained by arranging both sides of Equation (1) in logarithmic display with a base of 10 and multiplying both sides by 10 to make decibel (dB) units, and arranging for ⁇ [dB].
  • S M i [dBm] is the desired wave power of the PUCCH of the macro mobile station assumed to be in the vicinity of the femtocell base station i. Further, it is assumed that the environment of interference limited is assumed, and that the thermal noise N can be ignored. It is assumed that the interference power is I H regardless of the position of the femtocell mobile station, and Equation (5) holds for any femtocell. Also, the allowable interference power of the total uplink interference power of PUCCH in the macro base station 4 is calculated by subtracting the ⁇ min from S M.
  • the total value R1 of the radio resource usage rate is defined as the total value of the PUCCH radio resource usage rate of each femtocell, for example, as shown in Equation (6).
  • Equation (7) the average PUCCH uplink transmission power P j UL [dBm] per PRB is controlled as shown in Equation (7).
  • j is a subscript representing M or H, and corresponds to a macro mobile station and a femtocell mobile station, respectively.
  • P j max [dBm] is the maximum value of uplink transmission power.
  • P j o [dBm] represents the target uplink received power
  • L j represents the propagation loss with the femtocell mobile station 2-1.
  • the propagation loss from the macro mobile station 2-2 to the macro base station 4 causes the propagation loss from the femtocell mobile station 2-1 to the macro base station. It can be assumed that the propagation loss L M up to the station 4 is equal.
  • the first equation of the equation (8) is obtained by receiving a propagation loss L M with respect to the PUCCH transmission power (P M o + L M ) of the macro mobile station 2-2 and using the received power P M o It means that it is received by the station 4.
  • the second term on the right side corresponds to the PUCCH transmission power of the femtocell mobile station 2-1, and the propagation loss relative to the transmission power of the femtocell mobile station 2-1.
  • the receiving only L M meaning that they are received by the receiving power I H at the macro base station 4.
  • the term (P M o ⁇ min ) corresponds to the allowable value of the total uplink interference power of PUCCH in the macro base station 4, so the term including the third term (L M ) This means the PUCCH transmission power allowed for the entire femtocell mobile station 2-1 in a single macro cell.
  • the allowable transmission power, and propagation loss L H between the femtocell mobile station 2-1, the femtocell base station, using the total value of the wireless resource usage rate, uplink target received power P H o is calculated.
  • the detailed equation is specifically described for setting the uplink target received power.
  • the setting of the received power in the present invention is limited to those determined by these equations. It is not something.
  • the present invention takes into account the sum of the radio resource usage rates (radio resource usage rates) (total radio resource usage rates) of the cells that can interfere with the uplink received power of the radio base station (here, the macro base station). It is essential that the uplink target received power is set.
  • step S21 it received power measurement unit 21 measures the femtocell base station 1 of RSRP (P rx_H), the macro base station 4 RSRP the (P rx_M). This measurement is performed at a predetermined cycle T5 (for example, 100 msec).
  • the received power measurement unit 21 reports the measurement results of P rx_H and P rx_M to the femtocell base station 1-1 via the radio communication unit 20.
  • the said report should just be performed by predetermined period T6 (for example, about 1 second).
  • the reported measurement results of P rx_H and P rx_M may be values filtered using a predetermined weighting factor. Further, the reported measurement results of P rx_H and P rx_M may be moving average values calculated using a plurality of measurement values.
  • step S ⁇ b > 23 the transmission power setting unit 22 determines whether the uplink target received power P Ho notified by the femtocell base station 1 has been acquired. If acquired, the process proceeds to step S24, and updates the value obtained uplink target received power P H o, to implement uplink transmission power control in the femtocell mobile station 2-1. Uplink transmission power of the femtocell mobile station 2-1, the updated P H o is calculated by substituting the equation (7).
  • the femtocell mobile station 2-1 it is possible to receive broadcast information from the femtocell base station 1 in a known operation, can obtain a P Tx_H used to calculate the L H of the formula (7).
  • step S23 is implemented according to the presence or absence of step S17 in the operation of the femtocell base station after steps S21 and S22, the present invention is not limited to this, and is implemented independently of steps S21 and S22. May be.
  • step S31 the total resource usage rate calculation unit 30 acquires the radio resource usage rate reported by each femtocell base station 1 in the cycle T1.
  • the total resource usage rate calculation unit 30 collects the radio resource usage rate acquired in step S31, and calculates the total value R1 of the radio resource usage rate.
  • the collection and calculation are performed at a predetermined cycle T7 (for example, about 1 minute).
  • T7 may be set to the same value as the period T1 at which the femtocell base station transmits the radio resource usage rate.
  • the total value R1 of the radio resource usage rate in the present embodiment is the sum of radio resource usage rates reported from m femtocell base stations 1 existing in the same macro cell as shown in Equation (4).
  • step S33 the total resource usage rate transmission unit 31 notifies the total value R1 of the radio resource usage rate calculated in step S32 to all m femtocell base stations 1 in a cycle T7 via a wired line.
  • the femtocell base station 1 sets the PUCCH uplink target received power as shown in Equation (9), so that the PUCCH in all the femtocell base stations 1 in the macrocell is the macro base station.
  • the total uplink interference power given to the 4 PUCCHs can be kept below a certain level. Specifically, regardless of the number of installed femtocell base station 1, the total uplink interference power of PUCCH in the macro base station 4, by subtracting the gamma min from PUCCH desired wave reception power S M of the macro mobile station 2-2
  • the allowable interference power obtained from the value is an upper limit, and the PUCCH communication quality of the macro mobile station 2-2 can be expected to achieve ⁇ min or more.
  • the PUCCH transmission power of the femtocell mobile station 2-1 increases as the total value of the PUCCH radio resource usage rate of the femtocell base station decreases. When it is low, the PUCCH communication quality of each femtocell mobile station 2-1 can be improved.
  • the procedure shown in FIG. 4 can be realized by causing a computer such as a microprocessor to execute a program for controlling the base station. That is, it is only necessary to cause a computer that executes the base station control program to calculate the radio resource usage rate, acquire broadcast information and measurement information, and set the uplink target received power.
  • a computer such as a microprocessor to execute a program for controlling the base station. That is, it is only necessary to cause a computer that executes the base station control program to calculate the radio resource usage rate, acquire broadcast information and measurement information, and set the uplink target received power.
  • the transmission power control method in this embodiment is different from that in Embodiment 1 in the operation (step S11) of the resource usage rate calculation unit 13 in the femtocell base station 1. That is, while the PRSCH usage rate of PDSCH and the number of downlink active mobile stations are used as indexes of downlink data traffic in Embodiment 1, the downlink scheduling mobile station of the femtocell base station in downlink data transmission is used in this embodiment. Use numbers.
  • the downlink scheduling mobile station refers to a mobile station (Active mobile station) that has downlink data to be transmitted per unit time in the base station and is a PDSCH resource allocation candidate (Active mobile station). It means a mobile station to which PDSCH is transmitted. Since steps other than step S11 are the same as those in the first embodiment, descriptions of other configurations and operations are omitted.
  • the number of downlink scheduling mobile stations is used for calculation of the PUCCH radio resource usage rate performed by the resource usage rate calculation unit 13.
  • the number of downlink scheduling mobile stations is measured by the femtocell base station, and is also notified to the mobile station in the downlink control channel.
  • a wireless resource usage rate of the PUCCH with the number of downlink scheduling mobile station defines the ratio S H DL, i, k obtained by dividing the number of downlink scheduling mobile stations in the downlink Active number of mobile stations, similar to equation (2) Then, the PUCCH radio resource usage rate is calculated as shown in Equation (10).
  • the radio resource usage rate is defined in the same manner as in equation (2). However, if the radio resource usage rate is a function that increases monotonically with the increase in the number of downlink scheduling mobile stations, equation (10) It is not limited.
  • the number of downlink scheduling mobile stations is used to calculate the PUCCH radio resource usage rate.
  • the mobile station which actually transmits PUCCH for the feedback of PDSCH is grasped
  • Embodiment 3 of the Invention differs from the first and second embodiments in the operation (step S11) of the resource usage rate calculation unit 13 in the femtocell base station 1. That is, in Embodiments 1 and 2, the PUCCH radio resource usage rate is calculated without distinguishing between PRBs for transmitting Ack / Nack and PRBs for transmitting channel quality information, among the PUCCH PRBs. Then, the PUCCH radio resource usage rate is calculated by distinguishing them. In addition, since it is the same as that of Embodiment 1, 2, except step S11, description of another structure and operation
  • step S11 in the present embodiment in the calculation of the PUCCH radio resource usage rate performed by the resource usage rate calculation unit 13, different radio resource usage rates are defined for the PRB that transmits Ack / Nack and the PRB that transmits channel quality information. .
  • the PUCCH radio resource usage rate in a PRB that transmits Ack / Nack, a mobile station that has actually transmitted data using PDSCH by scheduling becomes a feedback target, so downlink scheduling is used for the PUCCH radio resource usage rate. Use the number of mobile stations.
  • radio resource usage rate of PUCCH at discrete time k is U H UL, i, k
  • PRB usage rate of PDSCH is U H DL, i, k (takes a value from 0 to 1)
  • the PUCCH radio resource usage rate is calculated as shown in Equation (11). Note that the sampling period at time k is an integer multiple of the subframe (1 msec).
  • the mobile station connected to the femtocell base station is a feedback target regardless of the presence or absence of data transmission.
  • the number of downlink communication mobile stations is used for.
  • the transmission power control method in the present embodiment differs from the first to third embodiments in the operation of the resource usage rate calculation unit 13 in the femtocell base station 1 (step S11). That is, in the first to third embodiments, the PUCCH radio resource usage rate is calculated using information on the downlink resource usage status, whereas in this embodiment, the PUCCH radio resource is calculated using information on the uplink resource usage status. Calculate usage. Since steps other than step S11 are the same as those in the first to third embodiments, descriptions of other configurations and operations are omitted.
  • step S11 in the present embodiment in the calculation of the PUCCH radio resource usage rate performed by the resource usage rate calculation unit 13, the PRB usage rate in all system bands and the PRB usage rate for the data channel (PUSCH) are used.
  • the PRB usage rate used for PUCCH transmission is obtained by subtracting the PRB usage rate used for data channel transmission from the PRB usage rate in the entire system band, and this PRB usage rate is determined as the PUCCH radio rate. Resource usage rate.
  • information on the uplink resource usage status (PRB usage rate) is used, so that the PUCCH resource usage status can be estimated indirectly.
  • Embodiment 5 of the Invention The wireless communication system according to the present embodiment has a configuration in which the first to fourth embodiments have the management server 3, but does not have the management server 3, and each femtocell base station 1 uses radio resources. The difference is that the total value R1 of the rates is calculated. That is, each femtocell base station 1 includes the total resource usage rate calculation unit provided in the management server 3, and each femtocell base station 1 wirelessly uses radio resource usage rates reported from other femtocell base stations. A total value R1 of the resource usage rate is calculated. Note that the wired interface between femtocell base stations uses, for example, an X2 interface standardized by 3GPP.
  • FIG. 7 is a block diagram showing the configuration of the wireless communication system according to the present embodiment.
  • the difference between FIG. 7 and FIG. 3 is that the total resource usage rate acquisition unit 15 held by the femtocell base station 1 is eliminated, and the total resource usage rate calculation unit 30 held by the management server 3 is replaced by the femto cell base station 1. This is a point that the cell base station 1 has.
  • Other configurations are the same as those in FIG.
  • the total resource usage rate calculation unit 16 acquires the radio resource usage rate reported by the other femtocell base station 1, and combines the radio resource usage rate calculated by its own resource usage rate calculation unit 13 with the total radio resource usage rate.
  • the value R1 is calculated.
  • Calculated total value of the radio resource usage rate R1 is used in the calculation of the uplink target received power P H o in the transmission power setting calculator 14.
  • Calculation of P H o is calculated by using the total value R1 of the radio resource utilization, carried out in the same manner as in Embodiment 1.
  • the present invention takes into account the sum of the radio resource usage rates (radio resource usage rates) (total radio resource usage rates) of the cells that can interfere with the uplink received power of the radio base station (here, the macro base station). It is one of the essence that the uplink target received power is set. Therefore, acquisition of broadcast information of the macro base station 4 (broadcast information acquisition unit 11) and acquisition of a measurement report from a femtocell mobile station (measurement report acquisition unit 12) are limited to the setting of the uplink target reception power of the present invention. Are not necessarily indispensable components in setting the uplink target received power of the present invention.
  • the total resource usage rate calculation unit 16 is unnecessary, and the transmission power setting calculation unit 14 is configured to acquire the resource usage rate from the resource usage rate calculation unit 13.
  • step S11 and step S16 related to the management server 3 are replaced with step S81 and step S82, respectively.
  • Other steps and the operation of the femtocell mobile station 2-1 are the same as those in FIG. 4 and FIG.
  • step S81 the resource usage rate calculation unit 13 measures the radio resource usage rate at the period T1, and reports the calculated radio resource usage rate to the other m ⁇ 1 femtocell base stations 1.
  • step S82 the total resource usage rate calculation unit 16 uses the radio resource usage rates acquired from the other m-1 femtocell base stations 1 and the radio resource usage rates of the own station, so that the total value of the radio resource usage rates is obtained.
  • R1 is calculated with a period T4.
  • the flowchart of FIG. 8 also shows steps that are not necessarily essential in setting the uplink target received power of the present invention so that the invention can be easily understood.
  • the present invention considers the sum of the radio resource usage rates (radio resource usage rates) of cells that can interfere with the uplink received power of the base station (here, the macro base station) (total radio resource usage rates), It is essential that the uplink target received power is set.
  • the transmission power control method according to the present embodiment exchanges radio resource usage rates between femtocell base stations, the PUCCH of all femtocell base stations 1 in the macro cell is not required without the management server 3. There is an effect that the PUCCH transmission power of the femtocell mobile station 2-1 can be increased while suppressing the uplink interference given to the PUCCH of the macro base station 4 below a certain level.
  • Embodiments 1 to 5 of the invention all the femtocell base stations in the macro cell use the common radio resource usage rate total value R1. However, you may set the total value of a different radio
  • R1 is set.
  • the femtocell base station that restricts the transmission power of PUCCH than when it is used and has a small radio resource usage rate and a small contribution to the total uplink interference power increases the transmission power of PUCCH than when R1 is used.
  • Embodiments 1 to 5 of the invention all femtocell base stations 1 in the macro cell report the radio resource usage rate to the management server 3 or the like, and the management server 3 or the like calculates the total radio resource usage rate.
  • the report of the radio resource usage rate and the acquisition of the total value of the radio resource usage rate may be performed only by the femtocell base station 1 included in the predetermined set.
  • An example of the predetermined set is the femtocell base station 1 that is in communication with the femtocell mobile station 2-1.
  • the femtocell base station 1 in communication performs the report of the radio resource usage rate and obtains the total value of the radio resource usage rates, and m is the number of femtocell base stations 1 in communication. Similarly, the calculation of the total value of the radio resource usage rate is performed for the femtocell base station 1 in communication.
  • the PUCCH allocation bandwidth may be different between the macro cell and the femto cell.
  • the allocated bandwidth of the macro cell and the PUCCH may be the same as in the femto cell 1 or may be different as in the femto cell 2.
  • the PUCCH of the macro cell receives uplink interference from the PUCCH or PUSCH of the femto cell.
  • Equation (12) An example of how to obtain the total value R3 of the radio resource usage rate in these cases is given in equation (12).
  • the PUCCH bandwidth (M H ) of the femtocell base station i is equal to or larger than the PUCCH bandwidth (M M ) of the macro cell, the PUCCH is responsible for uplink interference.
  • the average radio resource usage rate is calculated using the PUCCH radio resource usage rate of Equation (2) (Equation (B)).
  • Equation (B) the average radio resource usage rate is calculated by using the PUCCH radio resource usage rate and the PUSCH resource usage rate in Equation (2). Is used (formula (C)).
  • Embodiments 1 to 5 of the invention have described the case where the uplink target received power is set as the transmission power control of the PUCCH of the femtocell mobile station.
  • the parameter used for uplink transmission power control is not limited to the uplink target reception power.
  • the present invention may be applied to set the maximum value P j Max of uplink transmission power in Expression (7). it can. By controlling the maximum value of the uplink transmission power, the uplink interference in the macro base station can be stably suppressed below the allowable value even when the fluctuation of the uplink transmission power may be large.
  • Equation (14) the maximum uplink transmission power P H Max is obtained as in Equation (14).
  • the value (for example, 23 dBm) specified as the maximum transmission power on the actual device in the mobile station may be used as the setting value of P M Max .
  • the term (P M Max - ⁇ min ) means the PUCCH transmission power allowed for the entire femtocell mobile station 2-1.
  • the maximum uplink transmission power P M Max is obtained using the allowable transmission power and the total value of the radio resource usage rate.
  • the management server 3 collects the radio resource usage rate from the femtocell base station as the central control device and calculates the total value of the radio resource usage rate. It may be other than the management server.
  • the management server is called an OAM (Operation & Maintenance) server, but other than this, an MME (Mobility Management Entity), an S-GW (Serving Gateway), and an HeNB GW (Home eNodeB Gateway) ) Can also be used as a centralized control device.
  • an HNB GW Home NodeB Gateway
  • RNC Radio Network Controller
  • the wireless communication system to which the present invention is applied is not particularly limited.
  • it may be a W-CDMA system, or a wireless communication system (for example, WiMAX, IEEE 802) that employs a TDD (Time Division Duplex) system that uses the same radio frequency in a time division manner in uplink and downlink. .16 m), the present invention is also applicable.
  • WiMAX Wireless Fidelity
  • IEEE 802 Wireless Fidelity
  • Embodiments 1 to 5 of the invention the case where the present invention is applied to a femtocell base station in an environment in which macro base stations and femtocell base stations coexist has been described.
  • the environment in which base stations having different communication areas are mixed is not limited to this, and may be an environment in which, for example, a pico cell having a larger communication area than a femtocell base station and a macro cell are mixed.
  • the present invention since the number of users accommodated in the pico cell is smaller than that in the macro cell and the throughput is relatively high, the present invention may be applied to the pico cell base station in the same manner as the femto cell base station.
  • the pico cell base station acquires necessary information from the macro base station using the X2 interface or NLM, and uses the measurement information from the subordinate pico cell mobile station to set the uplink target received power as in the first to fifth embodiments. You only have to set it.
  • the present invention can also be applied in environments where macro cells, pico cells, and femto cells are mixed, and in any combination environment such as macro cells and micro cells (having a communication area that is greater than or equal to pico cells and less than macro cells). It is.
  • the present invention can also be applied in an environment where base stations having the same type of communication area such as between femtocells are mixed.
  • one of the essence of the present invention is that the usage rate of radio resources (radio resources) of a cell that can interfere with uplink reception power of a radio base station (here, a macro base station). It has been described that the uplink target received power is set in consideration of the total (utilization rate) (total radio resource usage rate). However, as shown in FIG.
  • the essence of the present invention lies in transmitting / receiving information on the radio resource usage rate in the uplink control channel and / or the total value thereof (S110, S160). This is because the target received power of the femtocell base station can be set based on the total value of the radio resource usage rate by transmitting and receiving the information.
  • the reception power of the reference signal transmitted by at least one of the femtocell base station and the radio base station that manages the cells in the vicinity of the femtocell is transmitted to the femtocell base station (S220), and the femtocell and the vicinity This is an operation of receiving the target received power of the femtocell base station determined based on the total value of the usage rate of radio resources in the cell from the femtocell base station (S230).
  • the femtocell mobile station can control the transmission power, This is because uplink interference of the entire femtocell can be suppressed.
  • radio base station, management device, and mobile station can be realized by hardware, software, or a combination thereof.
  • radio base station, management apparatus, and mobile station control method can also be realized by hardware, software, or a combination thereof.
  • realized by software means realized by a computer reading and executing a program.
  • Non-transitory computer readable media include various types of tangible storage media.
  • Examples of non-transitory computer-readable media are magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Compact Disc-Read Only Memory). , CD-R, CD-R / W, DVD-ROM (Digital Versatile Disc-ROM), DVD-R, DVD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM) ), Flash ROM, and RAM (Random Access Memory).
  • the program may also be supplied to the computer by various types of transitory computer readable media.
  • Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • a radio base station that manages at least one cell and performs radio communication with a mobile station in the cell, Means for calculating a usage rate of radio resources in the cell of an uplink control channel used for radio communication with the mobile station; Means for sending a utilization rate of radio resources in the cell to the network; Means for receiving either one of a radio resource usage rate in a cell managed by a nearby radio base station or a total value of radio resource usage rates in a cell managed by the own radio base station and a neighboring radio base station; A wireless base station.
  • appendix 2 The radio according to appendix 1, further comprising means for setting a target received power of a signal received from the mobile station based on a total value of radio resource usage rates in cells managed by the radio base station and neighboring radio base stations. base station.
  • the use rate of the radio resource is calculated based on the ratio of downlink radio resources allocated to mobile stations in the same cell and the number of mobile stations in which downlink data exists in the same cell.
  • the radio base station according to any one of 1 to 3.
  • the usage rate of the radio resource is calculated based on the number of mobile stations in which downlink data exists in the same cell and the number of mobile stations to which radio resources are allocated in the same cell.
  • the radio base station according to any one of the above.
  • Appendix 6 4. The method according to any one of appendices 1 to 3, wherein a usage rate of a radio resource used for a response to transmission success / failure of a downlink data channel is calculated based on the number of mobile stations to which downlink radio resources are allocated in the same cell. Radio base station.
  • Appendix 7 The radio according to any one of appendices 1 to 3, wherein a radio resource usage rate used for replying channel quality information of a downlink data channel is calculated based on the number of mobile stations in which downlink data exists in the same cell. base station.
  • a control device capable of communicating with at least one or more radio base stations, Receiving, from the radio base station, a radio resource usage rate of an uplink control channel in the cell by a mobile station performing radio communication in at least one cell managed by the radio base station; A control device that notifies the radio base station of a total value of usage rates of the radio resources in a cell received from at least one radio base station.
  • a mobile station in a wireless communication system Measure the received power of the reference signal transmitted by at least one of the radio base station that manages the cell in which the mobile station is located and the neighbor cell that is located in the vicinity of the cell. And transmit to the radio base station that manages the serving cell, A mobile station that receives target reception power at a radio base station that manages the serving cell, determined based on a total value of radio resource usage rates in the serving cell and the neighboring cells.
  • a radio base station that manages at least one cell and performs radio communication with a mobile station in the cell, Means for calculating a usage rate of radio resources in the cell by an uplink control channel used for radio communication with the mobile station; Means for setting a target received power of a signal received from the mobile station based on at least a utilization rate of radio resources in the cell; A wireless base station.
  • the usage rate of the radio resource is calculated by using the usage rate of all the uplink radio resources in the same cell and the usage rate of the radio resource of the uplink data channel. Radio base station.
  • a control method of a radio base station that manages at least one cell and performs radio communication with a mobile station in the cell, Calculating the usage rate of radio resources in the cell of the uplink control channel used for radio communication with the mobile station; Sending the wireless resource usage rate in the cell to the network, Receive either one of a radio resource usage rate in a cell managed by a nearby radio base station, or a total value of radio resource usage rates in a cell managed by its own radio base station and a neighboring radio base station, Radio base station control method.
  • the cover range of a cell managed by the radio base station and a cell managed by the neighboring radio base station is included in or partially overlapped with a cover range of another cell.
  • Wireless base station control method The cover range of a cell managed by the radio base station and a cell managed by the neighboring radio base station is included in or partially overlapped with a cover range of another cell.
  • the radio resource usage rate is calculated based on the ratio of downlink radio resources allocated to mobile stations in the same cell and the number of mobile stations in which downlink data exists in the same cell. 15. The method for controlling a radio base station according to any one of 1 to 14.
  • the radio resource usage rate is calculated based on the number of mobile stations in which downlink data exists in the same cell and the number of mobile stations to which radio resources are allocated in the same cell.
  • the method for controlling a radio base station according to any one of the above.
  • Appendix 17 15. The method according to any one of appendices 12 to 14, wherein a usage rate of a radio resource used for a response to transmission success / failure of a downlink data channel is calculated based on the number of mobile stations to which downlink radio resources are allocated in the same cell. Radio base station control method.
  • Appendix 18 The radio according to any one of appendices 12 to 14, wherein a radio resource usage rate used for replying channel quality information of a downlink data channel is calculated based on the number of mobile stations in which downlink data exists in the same cell. Base station control method.
  • a control method of a control device capable of communicating with at least one or more radio base stations, Receiving, from the radio base station, a radio resource usage rate of an uplink control channel in the cell by a mobile station performing radio communication in at least one cell managed by the radio base station; A control method for a control device, which notifies the radio base station of a total value of usage rates of radio resources in a cell received from at least one radio base station.
  • a method for controlling a mobile station in a wireless communication system comprising: Measuring a received power of a reference signal transmitted by at least one of a radio base station that manages a cell in which the mobile station is located and a neighboring cell that is located in the vicinity of the cell in which the mobile station is located, Transmit to the radio base station that manages the serving cell, A method for controlling a mobile station that receives target received power at a radio base station that manages the serving cell, determined based on a total value of radio resource usage rates in the serving cell and the neighboring cells.
  • Appendix 21 A control method of a radio base station that manages at least one cell and performs radio communication with a mobile station in the cell, Calculating a utilization rate of radio resources in the cell by an uplink control channel used for radio communication with the mobile station; Setting a target received power of a signal received from the mobile station based on at least a utilization rate of radio resources in the cell; Radio base station control method.
  • the usage rate of the radio resource is calculated using the usage rate of all uplink radio resources in the same cell and the usage rate of the radio resource of the uplink data channel. Radio base station control method.
  • Appendix 23 A program for managing at least one cell and causing a computer to execute a control method of a radio base station that performs radio communication with a mobile station in the cell, Calculating the usage rate of radio resources in the cell of the uplink control channel used for radio communication with the mobile station; Sending the wireless resource usage rate in the cell to the network, Receive either one of a radio resource usage rate in a cell managed by a nearby radio base station, or a total value of radio resource usage rates in a cell managed by its own radio base station and a neighboring radio base station, A program that causes a computer to execute processing.
  • Appendix 24 A program for causing a computer to execute a control method of a control apparatus capable of communicating with at least one or more radio base stations, Receiving, from the radio base station, a radio resource usage rate of an uplink control channel in the cell by a mobile station performing radio communication in at least one cell managed by the radio base station; A program for causing a computer to execute a process of notifying the radio base station of a total value of usage rates of radio resources in a cell received from at least one radio base station.
  • a radio base station that manages at least one cell and performs radio communication with a mobile station in the cell, The radio resource usage rate of the uplink control channel between the local station and the mobile station, the ratio of downlink radio resources allocated to the mobile station by the local station, and downlink data in the cell managed by the local station
  • a radio base station having means for calculating based on the number of mobile stations to be operated.
  • An application example of the present invention is a mobile station uplink transmission power control function implemented in an environment where a plurality of types of base stations having different communication areas are mixed in the same area in mobile communication. This is effective for the purpose of suppressing uplink interference that a base station having a certain communication area exerts on a base station having a larger communication area.
  • [Form 1] This is as the radio base station according to the fifth aspect.
  • [Form 2] From the mobile station based on a total value of radio resource usage rates in the first cell managed by the first radio base station and the second cell managed by the second radio base station Means for setting a target received power of a received signal; The radio base station according to aspect 1.
  • [Form 3] The coverage of the first cell managed by the first radio base station and the second cell managed by the second radio base station is the coverage of the third cell managed by the third radio base station. Covered by the coverage, or at least partly overlaps, The radio base station according to mode 1 or 2.
  • the means for calculating is based on the ratio of downlink radio resources allocated to mobile stations in the first cell and the number of mobile stations in which downlink data exists in the first cell, Calculating a usage rate of the radio resource; The radio base station according to any one of Forms 1 to 3.
  • the means for calculating is based on the number of mobile stations for which downlink data exists in the first cell and the number of mobile stations to which downlink radio resources are allocated in the first cell. Calculating the usage rate of the radio resource; The radio base station according to any one of Forms 1 to 3.
  • the calculating means calculates a usage rate of radio resources used for a response to transmission success / failure of a downlink data channel based on the number of mobile stations to which downlink radio resources are allocated in the first cell.
  • the radio base station according to any one of Forms 1 to 3.
  • the means for calculating calculates a usage rate of radio resources used for replying channel quality information of a downlink data channel based on the number of mobile stations where downlink data exists in the first cell.
  • the radio base station according to any one of Forms 1 to 3.
  • [Form 8] As in the control device according to the sixth aspect.
  • [Form 9] The mobile station according to the seventh aspect.
  • [Mode 10] This is as the radio base station according to the eighth aspect.
  • a first radio base station that manages a first cell and performs radio communication with a mobile station in the first cell, Calculating a radio resource usage rate in the first cell by an uplink control channel used for radio communication with the mobile station; Sending a utilization rate of radio resources in the first cell to the network; The usage rate of the radio resource in the second cell managed by the second radio base station, or the second cell managed by the first cell and the second radio base station managed by the first radio base station Receiving a total value of utilization of radio resources in the cell, A wireless communication method.
  • the first radio base station has a total value of radio resource usage rates in the first cell managed by the first radio base station and the second cell managed by the second radio base station.
  • the wireless communication method Based on setting a target received power of a signal received from the mobile station, The wireless communication method according to the eleventh aspect.

Landscapes

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

Abstract

L'invention concerne une première station de base radio, qui gère une première cellule et réalise une communication radio avec une station mobile dans la première cellule, laquelle première station de base radio comprend : un moyen pour calculer un taux d'utilisation d'une ressource radio utilisée, dans la première cellule, par un canal de commande amont utilisé pour la communication radio avec la station mobile ; un moyen pour envoyer le taux d'utilisation d'une ressource radio dans la première cellule à un réseau ; et un moyen pour recevoir soit un taux d'utilisation d'une ressource radio dans une seconde cellule gérée par une seconde station de base radio soit la somme totale du taux d'utilisation d'une ressource radio dans la première cellule gérée par la première station de base radio et du taux d'utilisation d'une ressource radio dans la seconde cellule gérée par la seconde station de base radio. L'objectif de l'invention est de supprimer un brouillage amont, au moyen d'une station de base radio, à partir de la cellule gérée par une autre station de base radio à proximité.
PCT/JP2015/067310 2014-06-17 2015-06-16 Station de base radio, appareil de commande et station mobile WO2015194553A1 (fr)

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JP2014-124353 2014-06-17

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CN112954744A (zh) * 2019-11-26 2021-06-11 大唐移动通信设备有限公司 一种移动终端的接入控制方法及装置
CN117156529A (zh) * 2023-11-01 2023-12-01 唐人通信技术服务股份有限公司 一种基站供电管理方法及系统

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JP2020053788A (ja) * 2018-09-26 2020-04-02 ソフトバンク株式会社 大ゾーンセル基地局、地上セル基地局、それらを備えたシステム、及び、基地局管理装置
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CN117156529A (zh) * 2023-11-01 2023-12-01 唐人通信技术服务股份有限公司 一种基站供电管理方法及系统
CN117156529B (zh) * 2023-11-01 2024-01-16 唐人通信技术服务股份有限公司 一种基站供电管理方法及系统

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