WO2013161793A1 - Dispositif de régulation de paramètres radioélectriques, station de base radioélectrique, procédé de régulation de paramètres radioélectriques et programme - Google Patents

Dispositif de régulation de paramètres radioélectriques, station de base radioélectrique, procédé de régulation de paramètres radioélectriques et programme Download PDF

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Publication number
WO2013161793A1
WO2013161793A1 PCT/JP2013/061856 JP2013061856W WO2013161793A1 WO 2013161793 A1 WO2013161793 A1 WO 2013161793A1 JP 2013061856 W JP2013061856 W JP 2013061856W WO 2013161793 A1 WO2013161793 A1 WO 2013161793A1
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Prior art keywords
radio
cell
parameter
measurement information
change
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PCT/JP2013/061856
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English (en)
Japanese (ja)
Inventor
航生 小林
弘人 菅原
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日本電気株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H04W16/08—Load shedding arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to a radio parameter control device, a radio base station, a radio parameter control method, and a program in a radio communication network, and more particularly to a radio parameter control device, a radio base station, and a radio that are suitable for controlling radio parameters of a plurality of radio cells.
  • the present invention relates to a parameter control method and a program.
  • a cellular radio communication network typified by a cellular phone constitutes a wide service area by distributing a plurality of radio base stations.
  • Each radio base station forms a radio cell that is in a range where it can communicate with itself.
  • about 1 to 6 radio cells are managed by one radio base station.
  • the radio parameters of the radio cell are optimized.
  • a running test using a dedicated measuring instrument is carried out locally to measure the reception power of radio waves, the interference situation, the presence or absence of abnormal call disconnection or handover failure, and the throughput.
  • a place where reception power is insufficient (Weak coverage), a place where strong interference is received (Pilot polarization), and the like are specified, and radio parameters are adjusted to solve these problems.
  • radio parameters to be adjusted for example, antenna tilt angle, antenna azimuth angle, transmission power, handover parameters, etc. of a radio cell are generally used.
  • the optimization of the radio parameters of the radio cell based on the above running test involves manual measurement and tuning work, which contributes to an increase in the operation cost of the radio communication network. Therefore, in order to reduce the cost required for optimization of such radio parameters, development and standardization of technologies for autonomously optimizing radio parameters of radio cells are being promoted.
  • SON Self Organizing Network
  • 3GPP 3rd Generation Partnership Project
  • Patent Document 1 discloses a method for optimizing radio parameters of a radio cell for load distribution. According to the method disclosed in Patent Document 1, when a traffic load of a wireless cell is measured and the traffic load of the wireless cell (wireless cell A) is high, a wireless cell having a low traffic load around the wireless cell A Among them, the radio cell (radio cell B) having a large overlap with the radio cell A is selected. And while expanding the coverage of the radio cell B, the coverage of the radio cell A is reduced. On the other hand, when the traffic load of the wireless cell A is low, the coverage of the wireless cell B is reduced and the coverage of the wireless cell A is expanded. The above control is sequentially executed for all wireless cells.
  • Patent Document 1 does not consider a change in communication environment caused by a change in radio parameters of other radio cells when determining radio parameters of radio cells. That is, even after the communication environment has changed due to changes in the radio parameters of other radio cells, or even if it is certain that the communication environment will change due to changes in the radio parameters in the near future, Radio parameters are determined using measurement information including measurement information before the change of the environment. As a result, the radio parameter of the radio cell is determined to be an inappropriate value, and there is a possibility that the communication quality deteriorates due to the change of the radio parameter.
  • the radio communication network includes a macro radio base station 101, a pico radio base station 103, and a pico radio base station 105.
  • the macro radio base station 101 manages the macro radio cell 102
  • the pico radio base station 103 manages the pico radio cell 104
  • the pico radio base station 105 manages the pico radio cell 106.
  • the macro radio cell 102 has a low load
  • both the pico radio cell 104 and the pico radio cell 106 have a high load.
  • the pico radio cell 104 and the pico radio cell 106 perform load distribution without considering the change in the communication environment caused by the change in the radio parameters of each other. For example, as shown in FIG. 12, the pico radio base station 103 and the pico radio base station 105 reduce the coverage of each radio cell by reducing the transmission power. As a result of the simultaneous load distribution by the two pico radio base stations, the load on the macro radio cell 102 increases rapidly, and the communication quality in the macro radio cell 102 deteriorates.
  • the present invention has been made in view of the above problems, and is capable of controlling radio parameters of a radio cell while taking into account changes in the communication environment caused by changes in radio parameters of other radio cells.
  • An object is to provide an apparatus, a radio base station, a radio parameter control method, and a program.
  • a radio parameter control apparatus is a radio parameter control apparatus that controls radio parameters of a radio cell managed by a radio base station, and is used for determining radio parameters of a first radio cell. Whether the first measurement information includes the second measurement information that is invalidated by the change of the radio parameter of the second radio cell in the radio cell affected by the change of the radio parameter of the second radio cell.
  • a measurement information determination unit that determines whether or not, an affected cell determination unit that determines a radio cell affected by a change in a radio parameter of the second radio cell, and a determination result in the measurement information determination unit, A radio parameter determination unit that determines radio parameters of one radio cell.
  • the radio base station includes a radio parameter control device, and information related to radio cells affected by a change in radio parameters of radio cells managed by the radio base station and changes in radio cells managed by the radio base station.
  • the radio parameter change information is exchanged with another radio base station.
  • a radio parameter control method is a radio parameter control method in a radio cell managed by a radio base station, and determines a radio cell that is affected by a change in radio parameter of the second radio cell. Then, the first measurement information used for determining the radio parameter of the first radio cell is changed in the radio parameter of the second radio cell in the radio cell affected by the change of the radio parameter of the second radio cell. It is determined whether or not the second measurement information that becomes invalid is included, and the radio parameter of the first radio cell is determined according to the determination result.
  • a program according to a fourth aspect of the present invention is a program that causes a computer to execute radio parameter control in a radio cell managed by a radio base station, and is affected by a change in radio parameter of the second radio cell.
  • the first measurement information used for determining the radio parameter of the first radio cell is the radio parameter of the second radio cell in the radio cell affected by the change of the radio parameter of the second radio cell. Determining whether or not second measurement information that is invalid due to the change in the information is included, and determining a radio parameter of the first radio cell according to the measurement determination result. To be executed.
  • a radio parameter control apparatus capable of controlling radio parameters of a radio cell while considering a change in communication environment caused by a change of radio parameters of another radio cell A program can be provided.
  • FIG. 1 is a configuration diagram of a wireless communication network according to a first exemplary embodiment
  • 1 is a configuration diagram of a radio parameter control device according to a first exemplary embodiment
  • FIG. 3 is a diagram showing a flow of wireless parameter control processing according to the first exemplary embodiment.
  • 1 is a configuration diagram of a wireless communication network according to a first specific example of a first embodiment
  • FIG. 6 is a diagram illustrating measurement information in each radio cell according to the first specific example of the first embodiment
  • 3 is a configuration diagram of a wireless communication network according to a specific example 2 of the first embodiment
  • FIG. FIG. 6 is a diagram illustrating measurement information in each wireless cell according to the second specific example of the first embodiment.
  • FIG. 3 is a configuration diagram of a radio parameter control device according to a second exemplary embodiment
  • FIG. 10 is a diagram illustrating a flow of wireless parameter control processing according to the second exemplary embodiment
  • FIG. 6 is a configuration diagram of a wireless communication network according to a third exemplary embodiment. It is a figure explaining the problem which invention is going to solve. It is a figure explaining the problem which invention is going to solve.
  • the wireless communication network system of FIG. 1 includes a wireless parameter control device 1 and a wireless base station 2.
  • the radio base station 2 manages the radio cell 3 and performs bidirectional radio communication with the UE 4.
  • the radio base station 2 is connected to an upper network (not shown), and relays traffic between the UE 4 and the upper network.
  • the upper network includes a radio access network and a core network.
  • the radio base station 2 includes a relay base station that relays radio signals of the radio cell 3.
  • the radio parameter control device 1 acquires measurement information from the radio base station 2 and determines radio parameters of the radio cell 3.
  • the measurement information acquired from the radio base station 2 the communication statistical quality measured and stored in the radio base station 2, the measurement information of the UE 4 reported from the UE 4 to the radio base station 2 (UE measurement information) )and so on.
  • Specific examples of communication statistical quality include: radio link abnormal disconnect rate (Radio Link Failure Rate), call abnormal disconnect rate (Call Drop Rate), handover failure rate (Handover Failure Rate), traffic load, average user throughput, cell For example, throughput.
  • Specific examples of UE measurement information include radio quality for each radio cell 3 measured by the UE 4, for example, received power of a downlink pilot signal or a reference signal, signal-to-noise such as SINR (Signal to Interference plus Noise Ratio), etc. Interference ratio.
  • the UE measurement information includes communication information such as throughput and BLER (Block Error Rate), event information such as occurrence of abnormal disconnection or handover failure, time when the UE measures the radio quality, an identifier of the measured radio cell 3, Information such as an identifier of the UE 4 may be included.
  • the radio parameters determined by the radio parameter control device 1 include an antenna tilt angle, an antenna azimuth angle, transmission power, a handover parameter, and the like for each radio cell 3.
  • the radio parameter control device 1 includes a radio parameter determination unit 10, a measurement information determination unit 11, and an affected cell determination unit 12.
  • the radio parameter determination unit 10 determines the radio parameters of the radio cell 3 based on the measurement information acquired from the radio base station 2.
  • the radio parameter determination unit 10 changes the radio parameter determination method depending on whether invalid measurement information is included in the measurement information used when determining the radio parameter.
  • the wireless parameter is determined by suppressing the change of the wireless parameter or placing importance on the measurement information excluding the invalid measurement information rather than the invalid measurement information.
  • the radio parameter determination unit 10 changes the identifier of the radio cell 3 whose radio parameter is changed and the change time (or change) of the radio parameter.
  • the determined time is stored as wireless parameter change information.
  • the timing of storing the radio parameter change information is after instructing the radio base station 2 to change the radio parameter of the radio cell 3 or after determining to change the radio parameter of the radio cell 3. Also good.
  • the radio parameter change information preferably includes both the identifier of the radio cell 3 in which the radio parameter is changed and the change time of the radio parameter (or the time when the change is determined).
  • the radio parameter change information is not limited to the case where both the identifier of the radio cell 3 and the radio parameter change time are included, and only one of the information may be used.
  • the wireless parameter change information may be a flag that is valid only for a predetermined time from the time when the wireless parameter is changed (or the time when the change is determined).
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameter when determining the wireless parameter of the wireless cell 3. Specifically, when the radio parameter of a certain radio cell is changed (or decided to be changed) at time Tc before the determination time, the change of the radio parameter of the radio cell affects the communication environment. The measurement information before time Tc in the receiving radio cell (affected cell) is regarded as invalid measurement information. If the radio parameter change information does not include information on the time when the radio parameter was changed (or the time when the change was determined), the radio cell affected by the communication environment due to the change of the radio parameter of the radio cell The measurement information of (affected cell) may be uniformly invalid measurement information regardless of the time. In addition, when the wireless parameter change information does not include information on the identifier of the wireless cell whose wireless parameter has been changed, the measurement information of all the wireless cells before time Tc may be invalid measurement information.
  • the affected cell determination unit 12 determines a wireless cell (affected cell) that is affected by the communication environment due to a change in the wireless parameter of a certain wireless cell. For example, a radio cell whose radio parameter has been changed (hereinafter, parameter change cell) is determined as an affected cell. Alternatively, a radio cell in which a change occurs in a radio terminal (UE) to be accommodated due to a change in radio parameters may be predicted, and the predicted radio cell may be included in the affected cell.
  • UE radio terminal
  • the affected cell determination unit 12 uses the UE measurement information collected in the parameter change cell before the change of the radio parameter to determine which radio that the UE connected to the parameter change cell has changed after the change of the radio parameter. Predict the likelihood of connecting to a cell. Further, the affected cell determination unit 12 determines the predicted radio cell as an affected cell. For example, the affected cell determination unit 12 confirms whether or not the UE measurement information collected in the parameter change cell before the change of the radio parameter includes the identifier of the radio cell detected or measured by the UE.
  • the affected cell determination unit 12 determines that the UE that connected a part or all of the detected or measured radio cells to the parameter change cell is a radio It is predicted as a radio cell that is likely to be connected after the parameter is changed.
  • a method of selecting a part of the radio cells detected or measured by the UE only the radio cells whose reception power or reception quality is equal to or higher than a predetermined value are selected from the radio cells detected or measured by the UE. Or the like can be used.
  • connection destination of the UE is switched from the parameter change cell to another radio cell by changing the radio parameter.
  • the reverse movement occurs, that is, the UE is changed by the radio parameter change.
  • the connection destination is switched from a radio cell other than the parameter change cell to the parameter change cell, it is possible to predict a radio cell in which a change occurs in the accommodated radio terminal (UE) by using the same method.
  • the movement of the UE (change in the radio cell to which the UE is connected) associated with the change of the radio parameter is acquired as an actual measurement value, and a radio cell having a high frequency of movement from or to the parameter change cell is obtained.
  • the wireless parameter control device 1 acquires, by tracking on the network side, information related to which wireless cell the wireless terminal connected to the parameter changed cell before changing the wireless parameter connected to after changing the wireless parameter, Or it acquires by the report from a radio
  • wireless terminal acquires, by tracking on the network side, information related to which wireless cell the wireless terminal connected to the parameter changed cell before changing the wireless parameter connected to after changing the wireless parameter, Or it acquires by the report from a radio
  • the connection destination of the UE is switched from the parameter change cell to another radio cell by changing the radio parameter has been described here, the reverse movement occurs, that is, the UE is changed by the radio parameter change.
  • the same method can be used when the connection destination is switched from a radio cell other
  • the handover related information include a neighbor cell list and the number of handovers.
  • the adjacent cell list is a parameter set for each radio cell, and is a list in which radio cells that are candidates for handover destinations of radio terminals connected to the radio cell are registered.
  • the affected cell determination unit 12 may refer to this neighbor cell list and predict some or all of the radio cells registered in the neighbor cell list as radio cells in which a change is made in the radio terminal (UE) to be accommodated. . Further, the affected cell determination unit 12 may predict a radio cell having a history of handover in the past as a radio cell in which a change is made in a radio terminal (UE) to be accommodated with the parameter change cell.
  • position information of a radio cell or a radio base station may be used. For example, if position information at a point representing a radio cell is available, a radio cell existing within a predetermined distance from the parameter change cell is predicted as a radio cell in which a radio terminal (UE) that accommodates the cell changes. Also good. Alternatively, if there is a radio base station that manages the parameter change cell or a radio base station that manages the radio cell within a predetermined distance from the transmission / reception antenna of the parameter change cell or the transmission / reception antenna of the radio cell, the radio cell is accommodated. You may predict as a radio
  • the radio parameter determination unit 10 selects one radio cell to be controlled by the radio parameter.
  • the radio parameter determination unit 10 may select a radio cell in descending order or ascending order using the identifier of the radio cell uniquely assigned to each radio cell.
  • the radio parameter determination unit 10 may acquire the communication statistical quality of the radio cell, and may select the radio cell, for example, in descending order of abnormal call disconnection rate or in descending order of traffic load.
  • the radio cell selected in step S100 is referred to as a selected radio cell.
  • the radio parameter determination unit 10 determines whether or not the radio parameter change condition is satisfied for the selected radio cell.
  • the radio parameter change condition includes, for example, whether or not a predetermined time or more has elapsed since the previous radio parameter change time for the selected radio cell, whether or not a predetermined time has been reached, and the UE reported from the radio terminal Conditions such as whether or not the measurement information has reached a predetermined number and whether or not the communication statistical quality (call abnormal disconnection rate, traffic load, etc.) is greater than or less than a predetermined value can be used. If the wireless parameter change condition is satisfied, the process of the next step S102 is executed. On the other hand, if the condition for changing the radio parameter is not satisfied, the process returns to step S100, and the radio parameter determination unit 10 selects the next radio cell.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameter.
  • the measurement information here includes communication statistical quality measured and stored in the radio base station, UE measurement information (UE measurement information) reported from the UE to the radio base station, and the like.
  • the radio parameters of the selected radio cell are determined using the traffic load of the selected radio cell and the traffic load of the radio cell (peripheral radio cell) existing around the selected radio cell. In this case, the measurement information determination unit 11 determines whether invalid measurement information is included for each of the measurement information in the selected radio cell and the measurement information in the neighboring radio cell.
  • the wireless parameter determination unit 10 changes the wireless parameter determination method according to the determination result of whether or not invalid measurement information is included in the measurement information used when determining the wireless parameter.
  • invalid measurement information is, for example, a radio parameter implemented (or decided to be implemented) for an arbitrary radio cell before the determination time in the measurement information determination unit 11.
  • the change (change time Tc) is measurement information before the change time (Tc) in the radio cell (affected cell) affected by the change of the radio parameter.
  • the affected cell is determined by the affected cell determination unit 12 using the above-described wireless parameter change information.
  • the affected cell determination unit 12 may determine a wireless cell whose wireless parameter has been changed (or determined to be changed) as an affected cell in the past.
  • wireless parameter may be estimated, and the predicted radio
  • the selected radio cell, the radio cell in which the radio parameter has been changed in the past, the radio cell (influenced cell) that has been affected (predicted to be affected) by the radio parameter change that has been implemented in the past may be a separate radio cell, or may be partly the same radio cell.
  • step S103 the wireless parameter determination unit 10 performs wireless parameter determination processing when invalid measurement information is included in the measurement information used when determining the wireless parameter.
  • step S104 the wireless parameter determination unit 10 executes a wireless parameter determination process when invalid measurement information is not included in the measurement information used when determining the wireless parameter.
  • the radio parameter determination unit 10 may use a general radio parameter determination method. For example, when the traffic load (radio resource usage rate) of the selected radio cell in the past hour is 80% and the traffic load (radio resource usage rate) of the surrounding radio cell is 20%, the radio parameter determination unit 10 The coverage is reduced, the traffic is moved from the selected radio cell to the neighboring radio cells, and load distribution is executed.
  • the reduction of the coverage may be carried out by controlling radio parameters such as lowering the transmission power of the selected radio cell or lowering the antenna tilt angle.
  • the radio parameter determination unit 10 can use the following method.
  • the radio parameters are determined with emphasis on measurement information excluding invalid measurement information over invalid measurement information.
  • the following method can be used. 1-1. Do not change radio parameters. 1-2. Reduce the amount of wireless parameter change. 1-3. Defer changes to radio parameters.
  • the radio parameter determination unit 10 executes the same radio parameter determination process as in the case where invalid measurement information is not included in the measurement information used when determining the radio parameter. Then, the radio parameter determination unit 10 adds a correction for reducing the change amount to the change value of the radio parameter obtained by the determination process of the radio parameter when invalid measurement information is not included. Then, the radio parameter determination unit 10 determines the corrected value as the final change value of the radio parameter. The radio parameter determination unit 10 obtains a ratio of invalid measurement information included in the measurement information used when determining the radio parameters, and suppresses the change of the radio parameter according to the ratio of the invalid measurement information. The strength to do may be determined.
  • the above 1-2 As a method of determining the strength to suppress the change of the radio parameter, for example, the above 1-2.
  • the amount of change of the wireless parameter is reduced in FIG. 5, the amount of change of the wireless parameter is reduced as the ratio of invalid measurement information is higher.
  • the above 1-3 When postponing the change of the wireless parameter in, the postponement time is lengthened as the ratio of invalid measurement information is higher.
  • the wireless parameter is determined using only the measurement information obtained by excluding invalid measurement information from the measurement information used when determining the wireless parameter.
  • the wireless parameter value (X) determined using only the measurement information obtained by excluding invalid measurement information from the measurement information used when determining the radio parameter and the invalid measurement among the measurement information used when determining the radio parameter Using the wireless parameter value (Y) determined using only information, the wireless parameter is determined by the weighted sum ( ⁇ X + ⁇ Y) of both wireless parameter values. For example, ⁇ is 0.8, ⁇ is 0.2, and the wireless parameter value is determined as 0.8X + 0.2Y.
  • step S105 the radio parameter determination unit 10 stores, as radio parameter change information, the radio cell identifier and the radio parameter change time (or the time when the change is determined) for the radio cell for which the radio parameter change has been determined. To do.
  • step S106 the process returns to step S100 and shifts to the processing of the next radio cell.
  • Radio parameters can be determined.
  • FIG. 4 is a configuration example of a wireless communication network according to the first specific example.
  • Specific example 1 is an example in which the radio parameter change condition of each radio cell is whether or not the traffic load (radio resource usage rate) of the radio cell is greater than or equal to a predetermined value.
  • the 4 includes two macro radio base stations (MNB) 21 and MNB 41.
  • the MNB 21 manages the macro radio cell (MC) 22 and the MNB 41 manages the MC 42.
  • a pico radio base station (PNB) 23 and a PNB 25 exist in the cover area of the MC 22, and a PNB 43 exists in the cover area of the MC 42.
  • the pico radio cell (PC) managed by the PNB 23 is PC24
  • the pico radio cell managed by the PNB25 is PC26
  • the pico radio cell managed by the PNB43 is PC44.
  • Each radio base station is connected to a radio parameter control device 1 (not shown).
  • the wireless parameter control process will be described based on the above configuration.
  • a case where the wireless parameters of the PC 24, PC 26, and PC 44 are controlled will be described.
  • the current time is 10:00 and the traffic load (radio resource usage rate) of each radio cell acquired at the current time is as shown in FIG.
  • FIG. 5 shows that the total value of the radio resource usage rate acquired between 09:00 and 10:00 in the MC 22 is 20%.
  • the aggregate value of the radio resource usage rate from 09:00 to 10:00 is also shown.
  • the control of the radio parameters of each pico radio cell includes the traffic load (radio resource usage rate) of the pico radio cell for the past hour and the traffic of the macro radio cell including the pico radio cell in the cover area for the past hour. It is assumed that traffic load between the pico radio cell and the macro radio cell is balanced using the load (radio resource usage rate). At this time, whether or not the radio resource usage rate in the past one hour of the pico radio cell is 50% or more is set as a radio parameter change condition in the pico radio cell. Note that the assumption here is merely an example, and does not limit the present invention.
  • the wireless parameter determination unit 10 of the wireless parameter control device 1 sequentially executes wireless parameter control processing for the PC 24, PC 26, and PC 44 (step S100 in FIG. 3).
  • the wireless parameter determination unit 10 determines whether or not the wireless parameter changing condition is satisfied for the PC 24 (step S101 in FIG. 3).
  • the traffic load of the PC 24 for the past hour is 80%, which is higher than 50%, which is a wireless parameter change condition. Therefore, it is determined that the PC 24 satisfies the wireless parameter change condition.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameters of the PC 24 (step S102 in FIG. 3). That is, it is determined whether invalid measurement information is included in the wireless resource usage rate for the past hour of the PC 24 and the wireless resource usage rate for the past hour of the MC 22 including the PC 24 in the cover area.
  • the radio parameters have not been changed for any radio cell before 10:00, which is the current time.
  • a determination process of radio parameters when invalid measurement information is not included is performed (step S104 in FIG. 3).
  • the wireless parameter determination unit 10 uses the wireless resource usage rate (80%) for the past hour of the PC 24 and the wireless resource usage rate (20%) for the past hour of the MC 22 to perform traffic between the PC 24 and the MC 22.
  • the wireless parameters of the PC 24 are determined so that the load is balanced. For example, the radio parameter determination unit 10 reduces the transmission power of the PC 24 and reduces the coverage of the PC 24 (PC 24 ′ in FIG. 4).
  • the wireless parameter determination unit 10 stores the time when the transmission power of the PC 24 is changed (10:00) and the identifier of the PC 24 as wireless parameter change information (step S105 in FIG. 3). Note that the timing for storing the radio parameter change information does not necessarily have to be after the radio parameter is actually changed, but may be after the radio parameter is determined to be changed. Thus, the wireless parameter control process of the PC 24 is completed.
  • the wireless parameter determination unit 10 proceeds to a wireless parameter control process of the PC 26 (step S100 in FIG. 3).
  • the wireless parameter determination unit 10 first determines whether or not the wireless parameter change condition is satisfied for the PC 26 (step S101 in FIG. 3).
  • the traffic load of the PC 26 for the past hour is 55%, which is higher than 50%, which is a wireless parameter change condition. Therefore, the PC 26 is determined to satisfy the wireless parameter change condition.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameters of the PC 26 (step S102 in FIG. 3). That is, the measurement information determination unit 11 determines whether invalid measurement information is included in the wireless resource usage rate for the past hour of the PC 26 and the wireless resource usage rate for the past hour of the MC 22 including the PC 24 in the cover area. judge. For this purpose, the affected cell determination unit 12 acquires the radio parameter change information stored by the radio parameter determination unit 10 as information related to the change of the radio parameter implemented (or decided to be implemented) in the past. To do. Then, the affected cell determination unit 12 determines a radio cell (affected cell) that is affected by a change in a radio parameter that has been implemented (or decided to be implemented) in the past.
  • the affected cell determination unit 12 includes a radio cell whose radio parameter is changed (or changed) and a radio cell whose radio parameter is changed (or changed).
  • a radio cell existing within a certain distance from is determined as an affected cell.
  • the wireless parameter of the PC 24 has already been changed. Therefore, it is assumed that the PC 24 itself and the MC 22 and the PC 26 existing around the PC 24 are determined as the influence cells.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the radio parameters of the PC 26, that is, measurement information of the affected cell (MC22, PC24, PC26), and It is determined whether or not measurement information before the wireless parameter change time (10:00) is included.
  • the measurement information used when determining the radio parameters of the PC 26 is the radio resource usage rate of the PC 26 and the MC 22 for the past one hour (from 09:00 to 10:00), so invalid measurement information is included. It is determined that Therefore, the wireless parameter determination unit 10 executes a wireless parameter determination process when invalid measurement information is included for the PC 26 (step S103 in FIG. 3). For example, the wireless parameter determination unit 10 suppresses the change of the wireless parameter of the PC 26 and does not change the wireless parameter of the PC 26. Thus, the wireless parameter control process of the PC 26 is completed.
  • the wireless parameter determination unit 10 proceeds to a wireless parameter control process of the PC 44 (step S100 in FIG. 3).
  • a wireless parameter determination process (step S104 in FIG. 3) when invalid measurement information is not included is performed. That is, the measurement information used when determining the wireless parameters of the PC 44 is the wireless resource usage rate of the PC 44 and the past one hour (09:00 to 10:00) of the MC 42 including the PC 44 in the cover area.
  • the invalid measurement information is the measurement information for the affected cell (MC22, PC24, PC26) before the change time (10:00) of the wireless parameter of the PC24, as described above. Therefore, the measurement information used when determining the wireless parameters of the PC 44 does not include invalid measurement information.
  • the radio parameter determination unit 10 uses the radio resource usage rate (65%) of the PC 44 for the past hour and the radio resource usage rate (30%) of the MC 1 for the past hour to traffic between the PC 44 and the MC 42.
  • the radio parameters of the PC 44 are determined so that the load is balanced. For example, the radio parameter determination unit 10 reduces the transmission power of the PC 44 and reduces the coverage of the PC 44 (PC 44 ′ in FIG. 4).
  • the wireless parameter determination unit 10 stores the time when the transmission power of the PC 44 is changed (10:00) and the identifier of the PC 44 as wireless parameter change information (step S105 in FIG. 3). Thus, the wireless parameter control process of the PC 44 is completed.
  • FIG. 6 is a configuration example of a wireless communication network according to the second specific example.
  • Specific example 2 is an example in which the radio parameter change condition of each radio cell is whether or not the traffic load (radio resource usage rate) of radio cells existing around the radio cell is greater than or equal to a predetermined value. It is.
  • the 6 includes an MNB 51, a PNB 53, and a PNB 55.
  • the NB 51 manages the MC 52
  • the PNB 53 manages the PC 54
  • the PNB 55 manages the PC 56.
  • PNB 53 and PNB 55 exist in the cover area of MC 52.
  • Each radio base station is connected to a radio parameter control device 1 (not shown). The wireless parameter control process will be described with the above configuration.
  • the wireless parameters of the PC 54 and the PC 56 are controlled. It is assumed that the current time is 10:00 and the traffic load (radio resource usage rate) of each radio cell acquired at the current time is as shown in FIG. In FIG. 7, unlike FIG. 5, the counting period is every 30 minutes. Further, in FIG. 7, the average value of the radio resource usage rate for one hour is also managed. In this example, it is assumed that control for reducing the coverage of the PC 54 is performed at 9:30 for the purpose of load distribution with the macro wireless cell MC52. By the control for reducing the coverage, as shown in FIG. 7, the radio resource usage rate of the MC 52 increases from 40% to 80%, and the radio resource usage rate of the PC 54 decreases from 60% to 20%.
  • the control of the radio parameters of each pico radio cell includes the traffic load (radio resource usage rate) for the past pico radio cell and the macro radio cell including the pico radio cell in the cover area.
  • the traffic load between the pico radio cell and the macro radio cell is balanced using the traffic load (radio resource usage rate) of the past one hour.
  • the condition for changing the radio parameter in the PC 54 and the PC 56 is whether the radio resource usage rate of the MC 52 for the past one hour is 50% or more. Note that the assumption here is merely an example, and does not limit the present invention.
  • the wireless parameter determination unit 10 of the wireless parameter control device 1 sequentially performs wireless parameter control processing on the PC 54 and the PC 56 (step S100 in FIG. 3). First, the wireless parameter determination unit 10 determines whether or not the wireless parameter change condition is satisfied for the PC 54 (step S101 in FIG. 3).
  • the traffic load for the past one hour of the MC 52 is 60%, which is higher than the wireless parameter change condition of 50%, so that it is determined that the wireless parameter change condition is satisfied.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameters of the PC 54 (step S102 in FIG. 3). That is, the measurement information determination unit 11 determines whether invalid measurement information is included in the wireless resource usage rate for the past hour of the PC 54 and the wireless resource usage rate for the past hour of the MC 52.
  • the affected cell determination unit 12 acquires the radio parameter change information stored by the radio parameter determination unit 10 as information related to the change of the radio parameter implemented (or decided to be implemented) in the past. To do. Then, the affected cell determination unit 12 determines a radio cell (affected cell) that is affected by a change in a radio parameter that has been implemented (or decided to be implemented) in the past. In this example, the wireless parameter of the PC 54 is changed to 9:30. Therefore, it is assumed that the PC 54 itself and the MC 52 and the PC 56 existing around the PC 54 are determined as the influence cells.
  • the measurement information determination unit 11 is information on whether or not invalid measurement information is included in the measurement information used when determining the wireless parameter of the PC 54, that is, measurement information of the affected cell (MC52, PC54, PC56), and It is determined whether or not measurement information before the wireless parameter change time (9:30) is included.
  • the measurement information used when determining the wireless parameter of the PC 54 is the wireless resource usage rate of the PC 54 and the MC 52 including the PC 54 in the cover area for the past one hour (09:00 to 10:00). From this, it is determined that invalid measurement information is included in the measurement information used when determining the wireless parameters of the PC 54. Therefore, the wireless parameter determination unit 10 executes a wireless parameter determination process when invalid measurement information is included in the PC 54 (step S103 in FIG. 3).
  • the wireless parameter is determined by placing importance on the measurement information obtained by removing the invalid measurement information from the measurement information used when determining the wireless parameter of the PC 54 rather than the invalid measurement information. For example, all the invalid measurement information is ignored, and the wireless parameter is determined using only the measurement information obtained by removing the invalid measurement information from the measurement information used when determining the wireless parameter of the PC 54. That is, the PC 54 uses the wireless resource usage rate (20%) from 9:30 to 10:00 of the PC 54 and the wireless resource usage rate (80%) from 9:30 to 10:00 of the MC 52. Determine the radio parameters.
  • control is performed to increase the transmission power of the PC 54 and expand the coverage of the PC 54.
  • the wireless parameter determination unit 10 stores the time when the transmission power of the PC 54 is changed (10:00) and the identifier of the PC 54 as wireless parameter change information (step S105 in FIG. 3). Thus, the wireless parameter control process of the PC 54 is completed.
  • the wireless parameter determination unit 10 proceeds to a wireless parameter control process of the PC 56 (step S100 in FIG. 3).
  • the wireless parameter determination unit 10 first determines whether or not the wireless parameter change condition is satisfied for the PC 56 (step S101 in FIG. 3).
  • the traffic load for the past one hour of the MC 52 is 60%, which is higher than the wireless parameter change condition of 50%, so that it is determined that the wireless parameter change condition is satisfied.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameters of the PC 56 (step S102 in FIG. 3). That is, it is determined whether or not invalid measurement information is included in the wireless resource usage rate for the past hour of the PC 56 and the wireless resource usage rate for the past hour of the MC 52.
  • the affected cell determination unit 12 acquires the radio parameter change information stored by the radio parameter determination unit 10 as information related to the change of the radio parameter implemented (or decided to be implemented) in the past. To do.
  • the measurement information determination part 11 determines the radio cell (influence cell) which is influenced by the change of the radio
  • the wireless parameter of the PC 54 is changed (or decided to be changed) at 10:00. Therefore, it is assumed that the PC 54 itself and the MC 52 and the PC 56 existing around the PC 54 are determined as the influence cells.
  • the measurement information determination unit 11 determines whether or not invalid measurement information is included in the measurement information used when determining the wireless parameter of the PC 56, that is, measurement information of the affected cell (MC52, PC54, PC56), and It is determined whether or not measurement information before the wireless parameter change time (10:00) is included.
  • the wireless parameter determination unit 10 executes a wireless parameter determination process when invalid measurement information is included for the PC 56 (step S103 in FIG. 3).
  • the wireless parameter determination unit 10 suppresses the change of the wireless parameter of the PC 56 and does not change the wireless parameter of the PC 56.
  • the radio parameter determination unit 10 may reduce the change amount of the radio parameter of the PC 56. For example, when the wireless parameter is determined using the wireless resource usage rate of the past 56 hours (from 09:00 to 10:00) between the PC 56 and the MC 52, the determination is made to increase the transmission power of the PC 56 by 10 dB. For example, the change amount is halved and the transmission power is actually increased by 5 dB.
  • the wireless parameter determination unit 10 stores the time when the transmission power of the PC 56 is changed (10:00) and the identifier of the PC 56 as wireless parameter change information (step S105 in FIG. 3). ). Thus, the wireless parameter control process of the PC 56 is completed.
  • the radio parameter control apparatus 1 determines the radio parameters of the radio cell using the measurement information, It is determined whether or not measurement information before the change time of the radio parameter is included in the radio cell affected by the change of the radio parameter of the radio cell, and the radio parameter determination method is changed according to the result. Therefore, it is possible to control the radio parameters of the radio cell while taking into account changes in the communication environment caused by changes in radio parameters of other radio cells.
  • the wireless parameter control device 61 of FIG. 8 differs from the wireless parameter control device 1 according to the first embodiment of the present invention in that it includes an influence determination unit 13.
  • the influence determination unit 13 acquires measurement information for each wireless cell after the wireless parameter of the wireless cell is changed. Further, the influence determination unit 13 determines for each wireless cell whether or not the measurement information has changed before and after the change of the wireless parameter. And the influence determination part 13 determines the radio
  • the measurement information communication statistical quality or UE measurement information can be used.
  • the influence determination unit 13 uses a radio cell in which the radio resource usage rate has changed by a predetermined value (for example, 0.1) or more before and after the change of the radio parameter, A radio cell that has changed by a ratio (for example, 20%) or more is determined as a radio cell that is affected by a change in radio parameters.
  • the influence determination unit 13 obtains the average SINR value of the UE measurement information for each radio cell before and after the change of the radio parameter, and the value is a predetermined value or a predetermined value.
  • a radio cell that has changed by more than the ratio is determined as a radio cell that is affected by the change of the radio parameter.
  • the influence determination unit 13 does not necessarily have to determine the wireless cell affected by the change of the wireless parameter using the measurement information in the actual wireless communication network.
  • a radio parameter of a radio cell may be virtually changed using a simulator such as a radio wave propagation simulator or a system level simulator, and the change in the measurement information described above may be determined on the simulator.
  • the influence determination unit 13 Using the affected cell determination unit 12, the influence determination unit 13, or other means, the correspondence between the radio cell whose radio parameter has been changed and the radio cell (affected cell) affected by the change When the influence cell is determined again for the same wireless cell, the stored past correspondence relationship can be used.
  • the influence determination unit 13 determines a radio cell affected by the change of the radio parameter after the change of the radio parameter (step S107). ) Is included.
  • the influence determination unit 13 determines whether or not the measurement information of each wireless cell has changed before and after the change of the wireless parameter after the wireless parameter of each wireless cell is changed. Then, the wireless cell determined to have changed in the measurement information is stored as a wireless cell (influenced cell) affected by the change of the wireless parameter. Thereafter, when determining the affected cell for the same radio cell again, the stored affected cell is utilized.
  • the radio parameter control apparatus 61 determines a radio cell in which measurement information has changed before and after the change of the radio parameter as a radio cell affected by the change of the radio parameter. To do. Therefore, it becomes possible to predict a radio cell affected by the change of the radio parameter with higher reliability.
  • the radio parameter control device 1 is arranged as a part of the radio base station 2.
  • the wireless base stations 2 are connected using a wireless or wired communication line 71.
  • the wireless base stations 2 do not necessarily have to be directly connected by the communication line 71, and may be indirectly connected, for example, via an upper network.
  • Each radio base station 2 transmits radio parameter change information and information on radio cells (affected cells) affected by the radio parameter change of the radio cell managed by the radio base station via the communication line 71. Replace with a radio base station. Since the configuration and operation of the wireless parameter control device 1 are the same as those in the other embodiments, a description thereof will be omitted.
  • radio parameter control apparatus 1 As described above, radio parameter control apparatus 1 according to Embodiment 3 of the present invention is realized as part of the function of a radio base station. Therefore, a centralized control type server that centrally controls the radio parameters of a plurality of radio cells is not required, and the radio parameters of each radio cell can be controlled autonomously and distributedly.
  • the present invention has been described as a hardware configuration, but the present invention is not limited to this.
  • the present invention can also be realized by causing a CPU (Central Processing Unit) to execute a computer program for the processing of the wireless parameter control device in FIGS.
  • a CPU Central Processing Unit
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
  • Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (Random Access Memory)) are included.
  • the program may also be supplied to the computer by various types of temporary 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 parameter control device for controlling radio parameters of a radio cell managed by a radio base station, The first measurement information used for determining the radio parameter of the first radio cell is invalidated by the change of the radio parameter of the second radio cell in the radio cell affected by the change of the radio parameter of the second radio cell.
  • a measurement information determination unit that determines whether or not second measurement information to be included is included, An affected cell determining unit for determining a radio cell affected by a change in a radio parameter of the second radio cell;
  • a radio parameter determination unit that determines a radio parameter of the first radio cell according to a determination result in the measurement information determination unit;
  • a wireless parameter control device comprising:
  • the measurement information determination unit When the first measurement information includes measurement information in a radio cell affected by a change in radio parameters of the second radio cell, the measurement information in the affected radio cell is invalidated.
  • the measurement information determination unit When the first measurement information includes measurement information before the radio parameter change time of the second radio cell, the measurement information before the radio parameter change time of the second radio cell is invalidated.
  • the radio parameter control device according to appendix 1 or 2, which is determined as second measurement information.
  • the wireless parameter determination unit The radio parameter control device according to any one of appendices 1 to 3, which suppresses a change in radio parameters of the first radio cell when the first measurement information includes the second measurement information. .
  • the measurement information determination unit Obtaining a ratio of the second measurement information included in the first measurement information;
  • the wireless parameter determination unit Based on the ratio, determine the strength to suppress the change of the radio parameter,
  • the wireless parameter control device according to appendix 4 or 5.
  • the influence cell determination unit A third radio cell in which a change is made in a radio terminal accommodated by a change in radio parameter of the second radio cell is predicted, and the third radio cell is affected by a change in radio parameter of the second radio cell. Determine the radio cell to receive, The radio parameter control device according to any one of appendices 1 to 7.
  • the influence cell determination unit 9 The radio parameter control apparatus according to appendix 8, wherein the third radio cell is predicted using at least one of measurement information in the radio terminal, handover related information, and a radio cell position.
  • the wireless parameter determination unit After determining to change the radio parameter of the first radio cell, storing at least one of the identifier of the first radio cell and the change time of the radio parameter as radio parameter change information; The radio parameter control device according to any one of additional items 1 to 10.
  • Appendix 12 Comprising the wireless parameter control device according to any one of appendices 1 to 11, A radio base for exchanging information on a radio cell affected by a change in radio parameters of a radio cell managed by the radio cell and radio parameter change information changed in the radio cell managed by the radio cell with another radio base station Bureau.
  • a radio parameter control method in a radio cell managed by a radio base station A radio cell affected by the change of the radio parameter of the second radio cell is determined, and the change of the radio parameter of the second radio cell is included in the first measurement information used for determining the radio parameter of the first radio cell. Determining whether or not second measurement information that is invalidated by a change in the radio parameter of the second radio cell is included in the radio cell affected by A radio parameter control method for determining a radio parameter of the first radio cell according to the determination result.
  • Appendix 20 In determining a radio cell that is affected by a change in radio parameters of the second radio cell, A third radio cell in which a change is made in a radio terminal accommodated by a change in radio parameter of the second radio cell is predicted, and the third radio cell is affected by a change in radio parameter of the second radio cell. Determine the radio cell to receive, The radio parameter control method according to any one of appendices 13 to 19.
  • the first measurement information used for determining the radio parameter of the first radio cell includes the change of the radio parameter of the second radio cell in the radio cell affected by the change of the radio parameter of the second radio cell. Determining whether invalid second measurement information is included; and Determining a radio parameter of the first radio cell according to the determination result;
  • a radio parameter control system for controlling radio parameters of a radio cell managed by a radio base station, The first measurement information used for determining the radio parameter of the first radio cell is invalidated by the change of the radio parameter of the second radio cell in the radio cell affected by the change of the radio parameter of the second radio cell.
  • a measurement information determination unit that determines whether or not second measurement information to be included is included, An affected cell determining unit for determining a radio cell affected by a change in a radio parameter of the second radio cell;
  • a radio parameter determination unit that determines a radio parameter of the first radio cell according to a determination result in the measurement information determination unit;
  • a wireless parameter control system comprising:
  • Radio parameter control device 2 radio base station 3 radio cell 4 UE DESCRIPTION OF SYMBOLS 10 Radio parameter determination part 11 Measurement information determination part 12 Influence cell determination part 13 Influence determination part 21 Macro wireless base station (MNB) 22 Macro wireless cell (MC) 23 Pico Radio Base Station (PNB) 24 pico radio cell (PC) 25 Pico Radio Base Station (PNB) 26 Pico Radio Cell (PC) 27 UE 41 Macro Radio Base Station (MNB) 42 Macro Wireless Cell (MC) 43 Pico Radio Base Station (PNB) 44 Pico Radio Cell (PC) 45 UE 51 Macro Wireless Base Station (MNB) 52 Macro Wireless Cell (MC) 53 Pico Radio Base Station (PNB) 54 Pico Radio Cell (PC) 55 Pico Radio Base Station (PNB) 56 Pico Radio Cell (PC) 61 Wireless parameter control device 71 Communication line

Abstract

La présente invention a pour objet de réaliser un dispositif de régulation de paramètres radioélectriques à l'aide duquel, tout en prenant en compte un changement dans un environnement de communication qui se produit en raison d'un changement dans un paramètre radioélectrique d'une autre cellule radioélectrique, il est possible de réguler un paramètre radioélectrique d'une cellule radioélectrique. Un paramètre radioélectrique selon la présente invention comprend : une unité de détermination d'informations de mesure qui détermine si des premières informations de mesure, qui sont employées dans la détermination d'un paramètre radioélectrique d'une première cellule radioélectrique, contiennent des deuxièmes informations radioélectriques qui sont invalidées par le changement du paramètre radioélectrique d'une deuxième cellule radioélectrique, dans une cellule radioélectrique qui est affectée par un changement d'un paramètre radioélectrique de la deuxième cellule radioélectrique ; une unité de détermination de cellule affectée qui détermine une cellule radioélectrique qui est affectée par le changement du paramètre radioélectrique de la deuxième cellule radioélectrique ; et une unité de détermination de paramètre radioélectrique qui détermine, en fonction d'un résultat de détermination dans l'unité de détermination d'informations de mesure, le paramètre radioélectrique de la première cellule radioélectrique.
PCT/JP2013/061856 2012-04-24 2013-04-23 Dispositif de régulation de paramètres radioélectriques, station de base radioélectrique, procédé de régulation de paramètres radioélectriques et programme WO2013161793A1 (fr)

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JP5844441B1 (ja) * 2014-08-08 2016-01-20 ソフトバンク株式会社 通信端末装置及び通信システム
JP2017519403A (ja) * 2014-05-02 2017-07-13 サムスン エレクトロニクス カンパニー リミテッド 無線通信システムでリアルタイム送信電力調節方法及び装置
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