WO2009122778A1 - 無線局装置、無線リソースの制御方法、無線局制御プログラムを格納した記録媒体、及び無線通信システム - Google Patents
無線局装置、無線リソースの制御方法、無線局制御プログラムを格納した記録媒体、及び無線通信システム Download PDFInfo
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- WO2009122778A1 WO2009122778A1 PCT/JP2009/052342 JP2009052342W WO2009122778A1 WO 2009122778 A1 WO2009122778 A1 WO 2009122778A1 JP 2009052342 W JP2009052342 W JP 2009052342W WO 2009122778 A1 WO2009122778 A1 WO 2009122778A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
- H04W16/16—Spectrum sharing arrangements between different networks for PBS [Private Base Station] arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
- H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
Definitions
- the present invention relates to control technology of radio resources used for communication between radio stations.
- the femto base station and the base station in the existing mobile communication network transmit a common pilot signal.
- the mobile station performs synchronization establishment, channel estimation, and the like by receiving the common pilot signal, and transmits and receives data to and from the base station. Therefore, it is necessary for the mobile station to be able to receive the common pilot signal with good reception quality in order to provide good communication quality.
- a macro base station 811 forms a macro cell 801, transmits a common pilot signal CP1 with a fixed transmission power, and communicates with a mobile station (not shown).
- Femto base stations 812A and 812B form femtocells 802A and 802B, respectively, and communicate with mobile stations (not shown).
- Each of the femto base stations 812A and 812B measures the received power Pmacro [dBm] of the common pilot signal CP1 of the macro base station 811 and, using the same radio frequency band as the macro base station 811, Pmacro + Poffset [dBm]
- Poffset is a power offset, which is a constant value common to all femtocells 802A and 802B.
- Femto base stations as described above are being considered for use in systems such as W-CDMA (Wideband Code Division Multiple Access) and E-UTRAN (LTE: also called Long Term Evolution).
- W-CDMA Wideband Code Division Multiple Access
- E-UTRAN Long Term Evolution
- W-CDMA Wideband Code Division Multiple Access
- E-UTRAN Long Term Evolution
- the radio frequency band is divided into a plurality of resource blocks (PRBs; physical resource blocks).
- PRBs resource blocks
- a scheduler provided in a base station of E-UTRAN assigns a PRB, and the base station performs data transmission with the mobile station using the assigned PRB.
- PRBs resource blocks
- each of the macro base station 811 and the femto base station 812A shown in FIG. 10 communicates with a mobile station.
- the mobile station 91 is connected to the macro base station 811 to perform communication
- the mobile station 92 is connected to the femto base station 812A to perform communication.
- the mobile station 92 is a registered mobile station registered in the femto base station 812A.
- the mobile station 91 is a non-registered mobile station which is not registered in the femto base station 812A.
- the transmission power of the common pilot signal of the femto base station is obtained by adding the fixed power offset Poffset to the reception power of the common pilot signal from the macro base station. Decide. That is, the setting method disclosed in Patent Document 1 can determine the transmission power of the common pilot signal of the femto base station according to the reception power of the common pilot signal from the macro base station.
- the setting method disclosed in Patent Document 1 is not a sufficient method in consideration of the diversity of the installation environment of the femto base station 812A. Because, considering that the femto base station 812A is installed in the building, the loss of the wireless signal by the building (hereinafter referred to as “building penetration loss”) varies, so that the femto base station 812A This is because the level at which the downlink signal DS1 leaks to the outside is not uniform.
- the wireless parameters that affect the magnitude of interference to the downlink signal or uplink signal of the mobile station 91 that performs communication by connecting to the macro base station 811 are limited to the transmission power of the common pilot signal by the femto base station 812A described above. Absent. That is, any of the radio parameters that affect the transmission power of the femto base station 812A or the transmission power of the mobile station 92 communicating with the femto base station 812A is the macro base station 811 and the mobile station.
- the degree of interference to the upstream signal or downstream signal between 91 may be influenced.
- Such wireless parameters are, for example, the maximum value of total transmission power of the femto base station 812A, the target value of total received power RTWP (Received Total Wideband Power) from the mobile station by the femto base station 812A, transmission of the femto base station 812A The maximum value of the power density, the maximum value of the total transmission power of the mobile station 92, the maximum value of the transmission power density of the mobile station 92, and the like.
- RTWP Receiveived Total Wideband Power
- the problem of the above-mentioned interference arises not only when using a femto base station.
- it may be a problem even in a wireless ad hoc network in which a plurality of wireless stations autonomously form a network. That is, the problem of interference described above is generally observed when two other radio stations further communicate in the vicinity where the two radio stations are communicating (for example, outdoors, in a separate room separated by walls, etc.) It is something that can occur.
- the present invention has been made based on the above-described findings, and the object of the present invention is to effect interference to other radio stations located in the vicinity when communicating between two radio stations. It is an object of the present invention to provide a wireless station apparatus that can be suppressed in a controlled manner, a control method of wireless resources, a recording medium storing a wireless station control program, and a wireless communication system.
- a first aspect of the present invention is a wireless station apparatus that performs wireless communication with at least one opposing wireless station.
- the radio station apparatus includes a first measurement unit, a calculation unit, and a determination unit.
- the first measurement means measures the reception quality of a first radio signal transmitted from a first radio station different from any of the radio station apparatus and the opposing radio station.
- the calculation means uses the measurement value of the reception quality to calculate a loss estimate value regarding the propagation loss between the first wireless station and the wireless station apparatus.
- the determination means determines a wireless parameter related to wireless communication between the wireless station apparatus and the opposite wireless station based on the loss estimate.
- a second aspect of the present invention is a control method of radio resources used by a radio station apparatus performing radio communication with at least one opposing radio station.
- the method comprises the following steps (a), (b) and (c):
- the reception quality of the first radio signal transmitted from the first radio station different from any of the radio station apparatus and the opposite radio station is measured at the installation place of the radio station apparatus .
- a loss estimate value regarding the propagation loss between the first wireless station and the wireless station apparatus is calculated.
- a wireless parameter regarding wireless communication between the wireless station apparatus and the opposite wireless station is determined based on the loss estimation value.
- the magnitude of the propagation loss between the radio station apparatus according to the first aspect of the present invention and the first radio station located in the vicinity thereof is a radio signal transmitted and received by the first radio station. It can be used as an index indicating the degree of interference with a radio signal transmitted and received by the wireless station apparatus.
- the magnitude of the propagation loss between the wireless station apparatus and the first wireless station changes in accordance with the magnitude of the penetration loss of the building in which the wireless station apparatus is installed.
- the radio station apparatus calculates a loss estimate value regarding the propagation loss between the radio station apparatus and the first radio station, and based on this loss estimate value, the radio station apparatus Radio parameters for radio communication between the device and the opposing radio station may be determined.
- the wireless parameter includes, for example, a parameter that affects at least one of the transmission power of the wireless station apparatus and the transmission power of the opposite wireless station. That is, the radio station apparatus according to the first aspect of the present invention reflects the difference in propagation loss between the radio station apparatus and the first radio station. At least one of the transmit powers can be adjusted.
- the radio station apparatus according to the first aspect of the present invention and the radio resource control method according to the second aspect effectively interfere with other radio stations (that is, the first radio station) located in the vicinity. Can be suppressed.
- FIG. 1 is a diagram showing a configuration example of a wireless communication system including the femto base station 1 according to the present embodiment.
- the wireless communication system according to the present embodiment will be described as a wireless communication system of FDD (Frequency division Dupulex) -CDMA, more specifically, W-CDMA.
- FDD Frequency division Dupulex
- W-CDMA Wideband Code Division Dupulex
- the femto base station 1 forms a femtocell 2.
- the size of the femtocell 2 is defined by the coverage of the common pilot signal (CPICH: Common Pilot Channel) that the femto base station 1 transmits.
- CPICH Common Pilot Channel
- the CPICH transmitted by the femto base station 1 is referred to as a femto CPICH.
- the macro base station 4 forms a macrocell 5 overlaid on the femtocell 2.
- the size of the macro cell 5 is defined by the coverage of the CPICH transmitted by the macro base station 4.
- the CPICH transmitted by the macro base station 4 is referred to as a macro CPICH.
- the mobile station 3-1 connects to the femto base station 1 in the femtocell 2 to perform communication.
- the mobile station 3-2 is a mobile station not permitted to connect to the femto base station 1, and the point at which the reception quality of CPICH from the femto base station 1 exceeds the reception quality of CPICH from the macro base station 4 Even in the case of being located at (1), communication is performed by connecting to the macro base station 4.
- the mobile station 3-1 is a “registered mobile station” registered in the femto base station 1.
- the mobile station 3-2 is a “non-registered mobile station” which is not registered in the femto base station 1.
- the femto base station 1 may have a function of permitting connection of mobile stations up to a predetermined upper limit number.
- the mobile station 3-2 is a mobile station whose connection to the femto base station 1 has been refused due to the upper limit number of machines being exceeded.
- the mobile station 3-1 connected to the femto base station 1 is referred to as "femto mobile station”
- the mobile station 3-2 connected to the macro base station 4 is referred to as "macro mobile station”.
- the femto gateway device 61 is connected to the femto base station 1 and is also connected to the upper network 63.
- the femto gateway device 61 controls communication between the upper layer network 63 and the femto mobile station 3-1 present in the femto cell 2 formed by the subordinate femto base station 1, and transfers information.
- the macro gateway device 62 controls communication between the upper network 63 and the macro mobile station 3-2 present in the macro cell 5 formed by the subordinate macro base station 4. , To transfer information.
- the femto base station 1 is a base station that can be installed in a building such as a user's home.
- the femto base station 1 according to the present embodiment is configured such that radio waves leaking from the femto base station 1 and the femto mobile station 3-1 connected thereto to the outside of the building are connected to the macro base station 4 and the macro mobile station 3-
- the wireless parameter is a parameter related to a wireless resource used for communication between the femto base station 1 and the femto mobile station 3-1. Details of the determination procedure of the wireless parameter by the femto base station 1 will be described later.
- FIG. 1 illustrates only a limited number of elements for the convenience of the description of the present invention.
- the radio communication system according to the present embodiment may include many femto base stations and mobile stations in addition to those shown in FIG.
- FIG. 2 is a block diagram showing the configuration of the femto base station 1.
- the radio transmission / reception unit 11 receives an uplink signal transmitted from the femto mobile station 3-1 via the antenna 10, and outputs a downlink signal to be transmitted to the femto mobile station 3-1 to the antenna 10. Also, the wireless transmission / reception unit 11 measures the total received power RTWP (Received Total Wideband Power) from the mobile station within the frequency range used to transmit the uplink signal. The measured RTWP is used to determine the wireless parameters described later.
- RTWP Receiveived Total Wideband Power
- the reception data processing unit 12 decodes the uplink signal received by the wireless transmission / reception unit 11 and supplies the obtained uplink data to the wired transmission / reception unit 14.
- the transmission data processing unit 13 receives downlink data to be transmitted from the wired transmission / reception unit 14 to the mobile station, performs processing such as error correction coding, interleaving, and the like, and then supplies the data to the radio transmission / reception unit 11.
- the wired transmission and reception unit 14 functions as an interface for transmitting and receiving uplink data and downlink data with the femto gateway device 61.
- the wireless resource control unit 15 supplies the wireless transmission and reception unit 11 with a wireless parameter regarding a wireless resource used when the wireless transmission and reception unit 11 transmits and receives a wireless signal.
- the plurality of radio parameters specified by the radio resource control unit 15 include at least one parameter that affects the magnitude of the transmission power of the femto base station 1 or the magnitude of the transmission power of the femto mobile station 3-1.
- Be Specific examples of radio parameters that affect the transmit power of the femto base station 1 are the transmit power P_tx of the femto CPICH, the maximum value of the total transmit power of the femto base station 1, and the maximum value of the transmit power density of the femto base station 1. Etc.
- radio parameters that affect the transmission power of the femto mobile station 3-1 are target values RTWP_target and Ec / No (Received Energy per chip / power density) of the total reception power RTWP of the femto base station 1 Target value of SIR (Signal to Interference ratio), maximum value of total transmission power of the mobile station, maximum value of transmission power density of the mobile station, and the like.
- the wireless resource control unit 15 includes a wireless network control unit 151 and a wireless network control data setting unit 152.
- the radio network control unit 151 has a radio network controller (RNC: Radio Network Controller) function, and uses a frequency band to be used, CPICH transmission power P_tx, maximum value of total transmission power of all downlink channels, and uplink total reception.
- the wireless transmission / reception unit 11 is supplied with wireless parameters such as the target value RTWP_target of power.
- the values of radio parameters such as CPICH transmission power P_tx and target value RTWP_target of uplink total reception power are determined by the radio network control data setting unit 152.
- the radio network control data setting unit 152 receives the notification of the reception quality of the macro CPICH measured by the mobile station mode reception unit 16 described later. Further, the wireless network control data setting unit 152 receives the measurement value of RTWP in the frequency range of the uplink signal measured by the wireless transmission / reception unit 11. The radio network control data setting unit 152 uses the measurement value of the reception quality of the macro CPICH and the measurement value of the RTWP to set the transmission power of the femto base station 1 or the transmission power of the femto mobile station 3-1. Determine the radio parameters to be affected.
- the mobile station mode reception unit 16 receives the macro CPICH transmitted from the macro base station 4 forming the macro cell 5 overlaid on the femtocell 2 through the antenna 10, and measures the reception quality of the macro CPICH.
- the reception quality measured by the mobile station mode reception unit 16 may be a physical quantity that changes according to the attenuation of the macro CPICH.
- the mobile station mode reception unit 16 may measure the RSCP (Received Signal Code Power), Ec / No or SIR of the macro CPICH as the reception quality of the macro CPICH.
- the transmission power offset P_tx_offset for determining the femto CPICH transmission power P_tx of the femto base station 1 and the target value RTWP_target of the uplink total reception power received by the femto base station 1 from the mobile station are specifically determined.
- the femto CPICH transmission power P_tx may be determined by the following equation (1) using P_tx_offset.
- RSCP 0 is a measurement value of RSCP of the macro CPICH by the mobile station mode reception unit 16.
- P_tx RSCP0 + P_tx_offset [dBm] (1)
- FIG. 3 is a flowchart showing the procedure of determining P_tx_offset and RTWP_target by the femto base station 1.
- the mobile station mode reception unit 16 measures the reception power level RSCP0 of the macro CPICH.
- the radio network control data setting unit 152 calculates a value of transmission power (hereinafter referred to as a transmission power estimated value) Pul_tx when it is assumed that the femto base station 1 is connected to the macro base station 4 as a mobile station. .
- the calculation of the transmission power estimated value Pul_tx is performed using information based on the downlink signal transmitted from the macro base station 4.
- the transmission power of uplink signals by the mobile station is determined according to the measurement value of RSCP of CPICH transmitted from the base station. That is, the received power level RSCP0 of the macro CPICH may be used as information based on the downlink signal transmitted from the macro base station 4.
- the radio network control data setting unit 152 may calculate Pul_tx using the reception power level RSCP0 of the macro CPICH according to the operation of the W-CDMA mobile station.
- the method of determining Pul_tx by open loop transmission power control is a method of determining initial transmission power of DPCCH (Dedicated Physical Control Channel) in Chapter 8.5.3 of the specification 3GPP TS 25.331 V8.1.0 according to 3GPP (The 3rd Generation Partnership Project) Is specifically described as The formula for Pul_tx described in 3GPP TS 25.331 V8.1.0 is shown in Formula (2).
- DPCCH_Initial_power DPCCH_Power_offset-CPICH_RSCP (2)
- DPCCH_Initial_power corresponds to Pul_tx.
- DPCCH_Power_offset is broadcast information from the upper network 5.
- CPICH_RSCP in (2) is a measurement value by a mobile station of RSCP of CPICH.
- the calculation of Pul_tx in step S12 may be performed based on Closed Loop Power Control described in 3GPP TS 25.214 V7.3.0.
- the transmission power of the uplink signal by the mobile station is determined according to the transmission power increase / decrease information transmitted from the macro base station 4. That is, as the information based on the downlink signal transmitted from the macro base station 4, the transmission power increase / decrease information included in the downlink signal is used.
- the wireless network control data setting unit 152 may extract transmission power increase / decrease information from the downlink signal of the macro base station 4 received by the wireless transmission / reception unit 11 and calculate Pul_tx with reference to this.
- the wireless transmission / reception unit 11 measures RTWP within the frequency range of the upstream signal.
- the measurement of RTWP may be performed during a period in which the femto mobile station 3-1 is not transmitting data.
- the measurement of RTWP may be repeated at a predetermined cycle, and the measured value of RTWP may be an average value or a median value of a plurality of measurement results.
- HSUPA high speed uplink packet access
- transmission power temporarily increases. Therefore, if RTWP is larger than the predetermined value determined according to the transmission power at HSUPA, re-measurement of RTWP is performed or calculation of the average value is performed excluding values exceeding the predetermined value. It is good.
- step S14 the measured value of RTWP is compared with a threshold Th_rtwp. If the measured value of RTWP is sufficiently small, it means that there is no macro mobile station 3-2 connected to the macro base station 4 in the vicinity of the femto base station 1. In addition, an approximate expression of RTWP described later can be applied when the measured value of RTWP is sufficiently large. Therefore, when the measured value of RTWP falls below the threshold Th_rtwp, the wireless network control data setting unit 152 determines P_tx_offset and RTWP_target according to the following equations (3) and (4) (step S17).
- P_tx_offset P_tx_offset_default (3)
- RTWP_target RTWP_target_default (4)
- P_tx_offset_default is a reference value predetermined for P_tx_offset.
- RTWP_target_default is a reference value predetermined for RTWP_target. That is, in step S17, calculation and estimated loss value determination of P_tx_offset and RTWP_target according to the magnitude of the L E of the estimated loss value L E relating to a propagation loss between the macro mobile station 3-2 and the femto base station 1 is performed Absent.
- the determination in step S14 is a condition for determining that the macro mobile station 3-2 is located near the femto base station 1. Therefore, in step S14, whether or not the connection request from the macro mobile station 3-2 in the femto base station 1 is received instead of or in addition to the threshold determination on the magnitude of the measured value of RTWP It may be determined.
- specific examples of the connection request transmitted from the mobile station are the incoming call from the mobile station, the reception of the location registration request transmitted from the mobile station along with the cell selection operation at power on of the mobile station, the mobile station For example, the mobile station receives a location registration request transmitted from the mobile station along with the cell reselection operation at the time of changing the serving cell.
- the wireless network control data setting unit 152 calculates the estimated loss value L E (step S15).
- the estimated loss value L E is an estimated value regarding the magnitude of the propagation loss L P between the macro mobile station 3-2 and the femto base station 1.
- Specific examples of the estimated loss value is an estimated value of the propagation loss L P, and the like estimated value of a building penetration loss L B included in the propagation loss LP.
- step S16 the radio network control data setting unit 152, according to the magnitude of the estimated loss value L E, determining P_tx_offset and RTWP_target.
- P_tx_offset and RTWP_target may be determined such that the transmission power of the femto base station 1 and the transmission power of the femto mobile station 3-1 increase as the loss estimation value L E increases. Equations (5) and (6) shown below are specific examples of calculation formulas of P_tx_offset and RTWP_target.
- P_tx_offset MEDIAN (P_tx_offset_default + A1 * L E , P_tx_offset_max, P_tx_offset _min) (5)
- RTWP_target MEDIAN (RTWP_target_default + B1 * L E, RTWP_target_max, RTWP_target_min) (6)
- A1 and B1 are positive constants.
- P_tx_offset_max is a value predetermined as an upper limit value of P_tx_offset.
- P_tx_offset_min is a value predetermined as a lower limit value of P_tx_offset.
- RTWP_target_max is a value previously determined as the upper limit value of RTWP_target.
- RTWP_target_min is a value predetermined as a lower limit value of RTWP_target.
- the function MEDIAN () is a function for obtaining a median from among a plurality of values specified in the argument.
- FIG. 4 is a view schematically showing the femto base station 1 installed in the building 90.
- the propagation loss LP when the upstream signal transmitted from the macro mobile station 3-2 located outdoors reaches the femto base station 1 is the air propagation loss L as the sum of a and the building entry loss L B, it can be expressed by the following equation (7).
- the air propagation loss L A is the propagation loss of an uplink signal propagating through the atmosphere.
- Building entry loss L B is a loss in the uplink signal passes through the building 90.
- L P L A + L B [dB] (7)
- the transmission power Pul_tx_macro of the macro mobile station 3-2 connected to the macro base station 4 is calculated using the transmission power estimated value Pul_tx estimated by the femto base station 1 according to the following equation (8) Can be represented.
- ⁇ is a difference generated based on the distance difference between the distance DF between the macro base station 4 and the femto base station 1 and the distance DM between the macro base station 4 and the macro mobile station 3-2.
- Pul_tx_macro Pul_tx-L B + ⁇ [dBm] (8)
- the RTWP measurement value by the femto base station 1 can be expressed by the following equation (9).
- ⁇ represents the contribution of the femto mobile station 3-1 and the macro mobile stations other than the macro mobile station 3-2 to be measured.
- Nul represents thermal noise.
- Figure 5 shows an example of four types of loss estimate L E.
- Each expression of the estimated loss value L E shown in FIG. 5, by applying the equation (10), are represented using Pul_tx and RTWP.
- Estimated loss value L E shown in FIG. 5 (a) is an estimate of the propagation loss L P.
- Estimated loss value L E shown in FIG. 5 (b) is an estimate of the building entry loss L B. Note that the estimated loss value L E shown in FIG.
- the estimated value of the atmospheric propagation loss L A may be an empirical value indoor and others femto base station is installed in accordance with the typical distance between possible way outdoors.
- the estimated loss value L E shown in FIG. 5C is an estimated value of L A + 2L B.
- the value L A + 2L B in FIG. 5C is characterized in that the air propagation loss L A is not included in the equation on the right side.
- Figure 5 when calculating the estimated loss value L E with (c) is a calculation result obtained (5) and (6) may be calculated to P_tx_offset and RTWP_target are substituted into equation.
- a correspondence table or function indicating the correspondence between the size of L A + 2L B and the size of L P or the correspondence between the size of L A +2 L B and the size of L B may be given to the femto base station 1 in advance .
- an estimated value of the propagation loss L P or the building intrusion loss L B corresponding to the loss estimated value L E calculated using FIG. (6) It may be substituted in L E of the equation.
- the estimated loss value L E shown in FIG. 5D is an estimated value of ⁇ L B.
- [Delta] L B is the difference between the average value of the measured building entry loss L B by the building entry loss of the building 90 the femto base station 1 is installed L B and a number of femto base stations.
- AVE (L A + 2L B ) in the rightmost side of FIG. 5D represents the average value of L A + 2L B calculated by a large number of femto base stations using the equation of FIG. 5C.
- AVE (L A + 2L B ) is stored in advance in a non-volatile storage device (not shown) such as an HDD (Hard Disk Drive) or an EEPROM (Electrically Erasable and Programmable Read Only Memory) accessible by the femto base station 1. You should save.
- a non-volatile storage device such as an HDD (Hard Disk Drive) or an EEPROM (Electrically Erasable and Programmable Read Only Memory) accessible by the femto base station 1. You should save.
- AVE (L A + 2L B ) may be supplied from the upper network 63 to the femto base station 1.
- the aggregation server 64 may be installed in the upper network 63.
- the aggregation server 64 receives the calculation results of L A + 2L B by a large number of femto base stations, calculates an average value AVE (L A + 2L B ), and supplies it to each femto base station.
- the aggregation server 64 may be connected to a network (for example, the Internet) with which the femto base station 1 can communicate, and the connection location is not particularly limited.
- the femto base station 1 measures RTWP in the frequency range used for uplink signal transmission of the macro mobile station 3-2. Then, the femto base station 1 calculates the estimated loss value L E relating to a propagation loss L P using measurements of RTWP. Further, the femto base station 1, the estimated loss value based on the L E, the radio parameter that affects the magnitude of the transmission power of the femto transmission power of the base station 1 size or femto mobile station 3-1 (e.g., CPICH transmission Power P_tx, target value RTWP_target of uplink total received power, etc.) is determined.
- the radio parameter that affects the magnitude of the transmission power of the femto transmission power of the base station 1 size or femto mobile station 3-1 e.g., CPICH transmission Power P_tx, target value RTWP_target of uplink total received power, etc.
- the femto base station 1 can control the transmission power of the femto base station 1 and the femto mobile station 3-1 according to the magnitude of the loss estimate value L E related to the propagation loss L P. For this reason, the femto base station 1 can effectively suppress interference with other wireless stations located in the vicinity, that is, the macro mobile station 3-2.
- the femto base station 1 described above has a mobile station mode reception unit 16 for measuring the reception quality of the macro CPICH. Since the transmission power of the macro mobile station 3-2 is determined according to the reception quality level of the macro CPICH, the mobile station mode reception unit 16 obtains the transmission power estimated value Pul_tx under an assumption of connection to the macro base station 4. It is necessary for The mobile station mode reception unit 16 is also required to determine the transmission power of the femto CPICH based on the reception level of the macro CPICH, as shown in equation (1).
- the mobile station mode is not necessarily required.
- the femto base station 1 need not necessarily have the RNC function, and the RNC function may be located in the upper network 63.
- the femto base station 7 is applied to a wireless communication system in which the transmission power of the macro mobile station 3-2 is fixedly determined regardless of the reception quality level of the macro CPICH.
- FIG. 7 is a block diagram showing the configuration of the femto base station 7 according to the present embodiment.
- the femto base station 7 receives from the RNC disposed in the upper network 63 a notification of wireless parameters such as the used frequency to be applied to the wireless transmitting / receiving unit 11 and the transmission power of the common pilot signal.
- the wireless resource control unit 75 uses the RTWP measurement value measured by the wireless transmission / reception unit 11 to determine the wireless parameter. For example, in the case of determining P_tx_offset and RTWP_target described above as wireless parameters, the wireless resource control unit 75 executes S13 and subsequent steps of the flowchart shown in FIG. 3 in cooperation with other components such as the wireless transmission / reception unit 11 and the like. Just do it.
- FIG. 8 is a view schematically showing the femto base station 7 installed in the building 90.
- the transmission power Pul_tx of the macro mobile station 3-2 is fixedly determined.
- the transmission power Pul_tx of the macro mobile station 3-2 is a value common to the transmission power Pul_tx when the femto base station 7 is assumed to connect to the macro base station 4 as a mobile station. Therefore, in the present embodiment, the measured value of RTWP can be approximately expressed by the following equation (11).
- RTWP P Pul_tx-L P + Nul Pul_tx-L A -L B + Nul [dBm] (11)
- Figure 9 shows a specific example of the estimated loss value L E in the present embodiment.
- Estimated loss value L E shown in FIG. 9 (a2) is an estimated value of the propagation loss L P, corresponding to the estimated value shown in FIG. 5 (a) described above.
- Estimated loss value L E shown in FIG. 9 (b2) is an estimated value of a building penetration loss L B, corresponds to the estimated value of FIG. 5 (b).
- the estimated loss value L E shown in FIG. 9 (d2) is an estimated value of [Delta] L B, it corresponds to the estimated value of FIG. 5 (d).
- AVE (L A + L B ) represents an average value of L A + L B calculated by a large number of femto base stations.
- the value of AVE (L A + L B ) may be held by the femto base station 7 in advance, or may be supplied from the upper network 63 to the femto base station 7.
- Interference with the macro mobile station 3-2 can be effectively suppressed by the femto base station 7 according to the present embodiment as well as the above-described femto base station 1.
- RSCP measurement of macro CPICH and arithmetic processing part excluding RTWP measurement process that is, calculation of estimated loss value L E , and estimated loss value L E
- the calculation of radio parameters and the like using may be performed by a device arranged in the upper network 63, for example, an RNC.
- the wireless resource control units 15 and 75 may receive the determined wireless parameter from the upper network 63, and supply the received wireless parameter to the wireless transmitting / receiving unit 11.
- each arithmetic processing included in the determination procedure of the wireless parameter described as being performed by the femto base stations 1 and 7 is arbitrarily shared between the femto base stations 1 and 7 and the upper network 63 to which the femto base stations 1 and 7 are connected. Is possible.
- the wireless communication system to which the present invention is applied is not particularly limited.
- the present invention can be applied to a radio communication system adopting a TDD (Time Division Duplex) scheme in which the same radio frequency is divided in time in uplink and downlink.
- the present invention is applicable to a radio communication system of E-UTRAN system instead of W-CDMA system.
- Embodiment 1 and 2 of invention demonstrated the case where this invention was applied to a femto base station.
- the present invention can also be applied to, for example, each of a plurality of wireless stations that form a wireless ad hoc network autonomously.
- the adjustment procedure of the wireless parameter shown in FIG. 3 can be realized as a program executed by a computer such as a microprocessor.
- This program can be stored in various types of storage media, and can be transmitted via a communication medium.
- storage media include, for example, flexible disks, hard disks, magnetic disks, magneto-optical disks, CD-ROMs, DVDs, ROM cartridges, RAM memory cartridges with battery backup, flash memory cartridges, non-volatile RAM cartridges, etc.
- the communication medium includes a wired communication medium such as a telephone line, a wireless communication medium such as a microwave line, and the like, and also includes the Internet.
- the present invention can be applied to control technology of radio resources used for communication between radio stations.
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Abstract
Description
2 フェムトセル
3-1、3-2 移動局
4 マクロ基地局
5 マクロセル
10 アンテナ
11 無線送受信部
12 受信データ処理部
13 送信データ処理部
14 有線送受信部
15、75 無線リソース制御部
16 移動局モード受信部
61 フェムトゲートウェー装置
62 マクロゲートウェー装置
90 建物
151 無線ネットワーク制御部
152 無線ネットワーク制御データ設定部
Pul_tx 上り送信電力推定値
LE 損失推定値
LP 伝搬損失
LA 大気伝搬損失
LB 建物侵入損失
Nul 熱雑音
図1は、本実施の形態にかかるフェムト基地局1を含む無線通信システムの構成例を示す図である。本実施の形態にかかる無線通信システムは、FDD(Frequency division Dupulex)-CDMA、より具体的にはW-CDMA方式の無線通信システムであるとして説明を行う。
P_tx = RSCP0 + P_tx_offset [dBm] (1)
DPCCH_Initial_power = DPCCH_Power_offset - CPICH_RSCP (2)
ここで、"DPCCH_Initial_power"が、Pul_txに相当する。DPCCH_Power_offsetは、上位ネットワーク5からの報知情報である。また、(2)中のCPICH_RSCPは、CPICHのRSCPの移動局による測定値である。
P_tx_offset = P_tx_offset_default (3)
RTWP_target = RTWP_target_default (4)
ここで、P_tx_offset_defaultは、P_tx_offsetに対して予め定められた基準値である。また、RTWP_target_defaultは、RTWP_targetに対して予め定められた基準値である。つまり、ステップS17では、マクロ移動局3-2とフェムト基地局1の間の伝搬損失に関する損失推定値LEの算出及び損失推定値LEの大きさに応じたP_tx_offset及びRTWP_targetの決定は行われない。
P_tx_offset = MEDIAN(P_tx_offset_default + A1*LE,
P_tx_offset_max, P_tx_offset _min ) (5)
RTWP_target = MEDIAN(RTWP_target_default + B1*LE,
RTWP_target_max, RTWP_target_min ) (6)
ここで、A1及びB1は、正の定数である。P_tx_offset_maxは、P_tx_offsetの上限値として予め定められた値である。P_tx_offset_minは、P_tx_offsetの下限値として予め定められた値である。RTWP_target_maxは、RTWP_targetの上限値として予め定められた値である。RTWP_target_minは、RTWP_targetの下限値として予め定められた値である。また、関数MEDIAN()は、引数に指定された複数の値の中から中央値を求める関数である。
LP = LA + LB [dB] (7)
Pul_tx_macro = Pul_tx - LB +δ [dBm] (8)
RTWP = Pul_tx_macro - LP + Δ + Nul
= (Pul_tx - LB +δ) - (LA + LB) + Δ + Nul
= Pul_tx - LA - 2LB + δ + Δ + Nul [dBm] (9)
RTWP ≒ Pul_tx - LA - 2LB + Nul [dBm] (10)
上述したフェムト基地局1は、マクロCPICHの受信品質を測定するための移動局モード受信部16を有している。移動局モード受信部16は、マクロ移動局3-2の送信電力がマクロCPICHの受信品質レベルに応じて決定されるため、マクロ基地局4に接続すると仮定したときの送信電力推定値Pul_txを得るために必要である。また、移動局モード受信部16は、(1)式に示すように、マクロCPICHの受信レベルを基準としてフェムトCPICHの送信電力を決定するために必要である。
RTWP ≒ Pul_tx - LP+ Nul = Pul_tx - LA - LB + Nul [dBm] (11)
発明の実施の形態1及び2で述べた無線パラメータの決定処理のうち、マクロCPICHのRSCP測定、及びRTWP測定処理を除く演算処理部分、つまり損失推定値LEの計算と、損失推定値LEを用いた無線パラメータの計算等は、上位ネットワーク63に配置された装置、例えばRNCによって実行されてもよい。この場合、無線リソース制御部15及び75は、決定された無線パラメータを上位ネットワーク63から受信し、受信した無線パラメータを無線送受信部11に供給すればよい。つまり、フェムト基地局1及び7が行うものとして説明した無線パラメータの決定手順に含まれる各演算処理は、フェムト基地局1及び7とこれが接続される上位ネットワーク63との間で任意に分担させることが可能である。
Claims (35)
- 少なくとも1台の対向無線局との間で無線通信を行なう無線局装置であって、
前記無線局装置及び前記対向無線局のいずれとも異なる第1の無線局から送信される第1の無線信号の受信品質を測定する第1の測定手段と、
前記受信品質の測定値を用いて、前記第1の無線局と前記無線局装置との間の伝搬損失に関する損失推定値を計算する計算手段と、
前記損失推定値に基づいて、前記無線局装置及び前記対向無線局の間の無線通信に関する無線パラメータを決定する決定手段と、
を備える無線局装置。 - 前記計算手段は、前記第1の無線局による前記第1の無線信号の送信電力の推定値である送信電力推定値と前記受信品質の測定値との差分に基づいて前記損失推定値を計算する、請求項1に記載の無線局装置。
- 前記第1の無線局による前記第1の無線信号の送信電力は、第2の無線信号に基づく情報に応じて決定され、
前記第1の無線信号は、前記無線局装置及び前記対向無線局のいずれとも異なる第2の無線局に対して送信される信号であり、
前記第2の無線信号は、前記第2の無線局から前記第1の無線局に対して送信される信号であり、
前記計算手段は、前記第2の無線信号に基づく情報を用いて前記送信電力推定値を決定する、請求項2に記載の無線局装置。 - 前記第2の無線信号に基づく情報は、前記第2の無線信号の受信品質の測定値であり、
前記無線局装置は、前記第2の無線信号の受信品質を測定する第2の測定手段をさらに備え、
前記計算手段は、前記第2の測定手段による前記第2の無線信号の受信品質の測定値を用いて前記送信電力推定値を決定する、請求項3に記載の無線局装置。 - 前記送信電力推定値は、前記無線局装置が前記第2の無線局に移動局として接続して通信すると仮定したときの送信電力の値である、請求項4に記載の無線局装置。
- 前記第2の無線信号に基づく情報は、前記第2の無線信号に含まれる送信電力増減情報であり、
前記無線局装置は、前記第2の無線信号を受信する受信手段をさらに備え、
前記計算手段は、前記受信手段により受信された前記第2の無線信号から抽出された前記送信電力増減情報を用いて、前記送信電力推定値を決定する、請求項3に記載の無線局装置。 - 前記無線パラメータは、前記無線局装置の送信電力及び前記対向無線局の送信電力の大きさの少なくとも一方に影響するパラメータである、請求項1乃至6のいずれか1項に記載の無線局装置。
- 前記決定手段は、前記損失推定値が大きくなるにつれて、前記無線局装置の送信電力及び前記対向無線局の送信電力の少なくとも一方が大きくなるように前記無線パラメータを決定する、請求項7に記載の無線局装置。
- 前記第1の測定手段は、前記第1の無線信号の送信に使用される周波数範囲内での総受信電力を測定する、請求項1乃至8のいずれか1項に記載の無線局装置。
- 前記第1の測定手段は、前記総受信電力の複数回の測定により得られる平均値を前記受信品質の測定値とする、請求項9に記載の無線局装置。
- 前記決定手段は、前記第1の測定手段により得られる前記受信品質の測定値が予め定められた値より大きいことを条件として、前記損失推定値に基づく前記無線パラメータの決定を行う、請求項1乃至10のいずれか1項に記載の無線局装置。
- 前記第1の測定手段は、前記対向無線局が前記無線局装置に対して信号送信を行っていないことを条件として、前記周波数範囲内での受信品質の測定を行なう、請求項1乃至11のいずれか1項に記載の無線局装置。
- 前記損失推定値は、前記伝搬損失の推定値又は前記無線局装置と前記第1の無線局とを隔てる建物による建物侵入損失の推定値である、請求項1乃至12のいずれか1項に記載の無線局装置。
- 前記無線局装置は、小規模セルを形成する基地局であり、
前記対向無線局は、前記小規模セル内にて前記無線局装置と通信を行う第1の移動局であり、
前記第2の無線局は、前記小規模セルにオーバレイされた大規模セルを形成する基地局であり、
前記第1の無線局は、前記大規模セル内にて前記第2の無線局と通信を行なう第2の移動局である、請求項2乃至13のいずれか1項に記載の無線局装置。 - 少なくとも1台の対向無線局との間で無線通信を行なう無線局装置が使用する無線リソースの制御方法であって、
前記無線局装置及び前記対向無線局のいずれとも異なる第1の無線局から送信される第1の無線信号の受信品質を、前記無線局装置の設置場所にて測定するステップ(a)と、
前記受信品質の測定値を用いて、前記第1の無線局と前記無線局装置との間の伝搬損失に関する損失推定値を計算するステップ(b)と、
前記損失推定値に基づいて、前記無線局装置及び前記対向無線局の間の無線通信に関する無線パラメータを決定するステップ(c)と、
を備える無線リソース制御方法。 - 前記ステップ(b)における前記損失推定値の計算は、前記第1の無線局による前記第1の無線信号の送信電力の推定値である送信電力推定値と前記受信品質の測定値との差分を用いて行なわれる、請求項15に記載の無線リソース制御方法。
- 前記第1の無線局による前記第1の無線信号の送信電力は、第2の無線信号に基づく情報に応じて決定され、
前記第1の無線信号は、前記無線局装置及び前記対向無線局のいずれとも異なる第2の無線局に対して送信される信号であり、
前記第2の無線信号は、前記第2の無線局から前記第1の無線局に対して送信される信号であり、
前記ステップ(b)では、前記第2の無線信号に基づく情報を用いて前記送信電力推定値を決定する、請求項16に記載の無線リソース制御方法。 - 前記第2の無線信号に基づく情報は、前記第2の無線信号の受信品質の測定値であり、
前記無線リソース制御方法は、前記第2の無線信号の受信品質を測定するステップ(d)をさらに備え、
前記ステップ(b)では、前記第2の無線信号の受信品質の測定値を用いて前記送信電力推定値を決定する、請求項17に記載の無線リソース制御方法。 - 前記送信電力推定値は、前記無線局装置が前記第2の無線局に移動局として接続して通信すると仮定したときの送信電力の値である、請求項18に記載の無線リソース制御方法。
- 前記第2の無線信号に基づく情報は、前記第2の無線信号に含まれる送信電力増減情報であり、
前記無線リソース制御方法は、前記第2の無線信号を受信するステップ(d)をさらに備え、
前記ステップ(b)では、前記ステップ(b)で受信された前記第2の無線信号から抽出された前記送信電力増減情報を用いて、前記送信電力推定値を決定する請求項17に記載の無線リソース制御方法。 - 前記無線パラメータは、前記無線局装置の送信電力及び前記対向無線局の送信電力の大きさの少なくとも一方に影響するパラメータである、請求項15乃至20のいずれか1項に記載の無線リソース制御方法。
- 前記ステップ(c)では、前記損失推定値が大きくなるにつれて、前記無線局装置の送信電力及び前記対向無線局の送信電力の少なくとも一方が大きくなるように前記無線パラメータを決定する、請求項21に記載の無線リソース制御方法。
- 前記ステップ(a)で測定される前記受信品質は、前記第1の無線信号の送信に使用される周波数範囲内での総受信電力である、請求項15乃至22のいずれか1項に記載の無線リソース制御方法。
- 前記ステップ(a)では、前記総受信電力の複数回の測定により得られる平均値を前記受信品質の測定値とする、請求項23に記載の無線リソース制御方法。
- 前記ステップ(b)では、前記ステップ(a)のおける前記受信品質の測定値が予め定められた値より大きいことを条件として、前記損失推定値に基づく前記無線パラメータの決定を行う、請求項15乃至24のいずれか1項に記載の無線リソース制御方法。
- 前記ステップ(a)では、前記対向無線局が前記無線局装置に対して信号送信を行っていないことを条件として、前記周波数範囲内での受信品質の測定を行なう、請求項15乃至25のいずれか1項に記載の無線リソース制御方法。
- 前記損失推定値は、前記伝搬損失の推定値又は前記無線局装置と前記第1の無線局とを隔てる建物による建物侵入損失の推定値である、請求項15乃至26のいずれか1項に記載の無線リソース制御方法。
- 少なくとも1台の対向無線局との間で無線通信を行なう無線局装置に関する制御処理をコンピュータに実行させるための無線局制御プログラムを格納した記録媒体であって、
前記制御処理は、
前記無線局装置及び前記対向無線局のいずれとも異なる第1の無線局から送信される第1の無線信号の受信品質を前記無線局装置の設置場所にて測定することにより得られた測定値を取得する処理(a)と、
前記受信品質の測定値を用いて、前記第1の無線局と前記無線局装置との間の伝搬損失に関する損失推定値を計算する処理(b)と、
前記損失推定値に基づいて、前記無線局装置及び前記対向無線局の間の無線通信に関する無線パラメータを決定する処理(c)と、
を含む無線局制御プログラムを格納した記録媒体。 - 前記ステップ(b)における前記損失推定値の計算は、前記第1の無線局による前記第1の無線信号の送信電力の推定値である送信電力推定値と前記受信品質の測定値との差分を用いて行なわれる、請求項28に記載の無線局制御プログラムを格納した記録媒体。
- 前記第1の無線局による前記第1の無線信号の送信電力は、第2の無線信号に基づく情報に応じて決定され、
前記第1の無線信号は、前記無線局装置及び前記対向無線局のいずれとも異なる第2の無線局に対して送信される信号であり、
前記第2の無線信号は、前記第2の無線局から前記第1の無線局に対して送信される信号であり、
前記処理(b)では、前記第2の無線信号に基づく情報を用いて前記送信電力推定値を決定する、請求項29に記載の無線局制御プログラムを格納した記録媒体。 - 前記第2の無線信号に基づく情報は、前記第2の無線信号の受信品質の測定値であり、
前記制御処理は、前記第2の無線信号の受信品質の測定値を取得する処理(d)をさらに備え、
前記処理(b)では、前記第2の無線信号の受信品質の測定値を用いて前記送信電力推定値を決定する、請求項30に記載の無線局制御プログラムを格納した記録媒体。 - 前記第2の無線信号に基づく情報は、前記第2の無線信号に含まれる送信電力増減情報であり、
前記制御処理は、前記第2の無線信号から抽出された前記送信電力増減情報を取得する処理(d)をさらに備え、
前記処理(b)では、前記処理(d)で取得された前記送信電力増減情報を用いて、前記送信電力推定値を決定する無線局制御プログラムを格納した記録媒体。 - 前記処理(c)では、前記損失推定値が大きくなるにつれて、前記無線局装置の送信電力及び前記対向無線局の送信電力の少なくとも一方が大きくなるように前記無線パラメータを決定する、請求項28乃至32のいずれか1項に記載の無線局制御プログラムを格納した記録媒体。
- 少なくとも1台の対向無線局との間で無線通信を行なう無線局装置と、
前記無線局装置及び前記対向無線局のいずれとも異なる第1の無線局から送信される第1の無線信号の受信品質を、前記無線局装置の設置場所にて測定する第1の測定手段と、
前記受信品質の測定値を用いて、前記第1の無線局と前記無線局装置との間の伝搬損失に関する損失推定値を計算する計算手段と、
前記損失推定値に基づいて、前記無線局装置及び前記対向無線局の間の無線通信に関する無線パラメータを決定する決定手段と、
を備える無線通信システム。 - 前記第1の測定手段、前記計算手段、及び前記決定手段は、前記無線局装置内に配置される、請求項34に記載の無線通信システム。
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