WO2009119173A1 - 無線リソースの制御方法、無線局装置、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
無線リソースの制御方法、無線局装置、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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- WO2009119173A1 WO2009119173A1 PCT/JP2009/052343 JP2009052343W WO2009119173A1 WO 2009119173 A1 WO2009119173 A1 WO 2009119173A1 JP 2009052343 W JP2009052343 W JP 2009052343W WO 2009119173 A1 WO2009119173 A1 WO 2009119173A1
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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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
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a radio resource control technique used for communication between radio stations.
- a base station that can be installed indoors such as in user homes and small offices
- the range covered by this base station that can be installed indoors is extremely small compared to existing base stations that are installed outdoors, so it is called a femtocell.
- a base station that forms a femto cell is referred to as a femto base station.
- As an operation mode of the femto base station it is considered that only a pre-registered mobile station is connected to the femto base station for communication.
- the femto base station and the base station in the existing mobile communication network transmit a common pilot signal.
- the mobile station By receiving the common pilot signal, the mobile station performs synchronization establishment, channel estimation, etc., and transmits / receives data to / from the base station. For this reason, it is necessary to enable the mobile station 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 constant 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 reception power Pmacro [dBm] of the common pilot signal CP1 of the macro base station 811 and uses the same radio frequency band as the macro base station 811, and Pmacro + Poffset [dBm]. Is transmitted as common pilot signals CP2A and CP2B.
- Poffset is a constant value common to all femtocells 802A and 802B.
- the femto base station as described above has been studied for use in systems such as W-CDMA (Wideband Code Division Multiple Access) and E-UTRAN (also referred to as LTE: Long Term Evolution).
- W-CDMA Wideband Code Division Multiple Access
- E-UTRAN also referred to as LTE: Long Term Evolution
- W-CDMA Wideband Code Division Multiple Access
- E-UTRAN also referred to as LTE: Long Term Evolution
- a mobile station 91A is a mobile station registered in the femto base station 812A, and can communicate by connecting to the femto base station 812A.
- the mobile station 91A is not registered in the femto base station 812B and cannot communicate with the femto base station 812B.
- the mobile station 91B is a mobile station registered in the femto base station 812B, and can communicate with the femto base station 812B. It is assumed that the mobile station 91B is not registered in the femto base station 812A and cannot communicate with the femto base station 812A.
- the quality of the downlink signal received by the mobile station 91A from the femto base station 812A may deteriorate.
- the uplink signal transmitted by the mobile station 91A can interfere with the uplink signal received by the femto base station 812B from the mobile station 91B. For this reason, there is a possibility that quality degradation of the uplink signal received by the femto base station 812B from the mobile station 91B may occur.
- the above-described interference problem is not limited to the case of using a femto base station.
- a wireless ad hoc network in which a plurality of wireless stations autonomously form a network can be a problem. That is, the above-described interference problem is that the connection between the first wireless station and the first registered wireless station permitted to connect to the second wireless station is permitted in the vicinity. This can generally occur when communication is performed with the second registered radio station.
- the present invention has been made on the basis of the above-described knowledge, and the object of the present invention is to prevent other wireless stations arranged in the vicinity when the wireless station performs wireless communication with a registered wireless station.
- An object of the present invention is to provide a radio resource control method, radio station apparatus, radio station control program, and radio communication system capable of effectively suppressing interference.
- the first aspect of the present invention is a radio resource control method for the first radio station.
- the method includes the following steps (a) and (b).
- step (a) a history of connection requests made from a plurality of second wireless stations to the first wireless station is recorded.
- step (b) the connection request frequency for each non-registered radio station that is not pre-registered in the first radio station among the plurality of second radio stations is used as an index, and the plurality of second radio stations It decides to perform adjustment of radio resources used for communication between at least one and the first radio station.
- the second aspect of the present invention is a radio station apparatus.
- the radio station apparatus includes a radio transmission / reception unit and a radio resource adjustment unit.
- the radio resource adjustment unit uses the connection request frequency for each non-registered radio station that is not registered in advance among the plurality of counter radio stations as an index based on the history of connection requests made by the counter radio stations.
- the wireless resource used for communication via the wireless transmission / reception unit with at least one of the opposite wireless stations is adjusted.
- the radio network control unit 15 corresponds to the radio resource adjustment unit.
- a third aspect of the present invention is a recording medium that stores a wireless station control program for causing a computer to execute control processing related to a wireless station device.
- the control process includes a process (a) for recording a history of connection requests made from a plurality of opposing radio stations to the radio station apparatus, and a pre-recording in the radio station apparatus among the plurality of opposing radio stations. Processing for determining execution of adjustment of radio resources used for communication between at least one of the plurality of opposed radio stations and the radio station apparatus, using as an index the connection request frequency for each unregistered radio station that is not registered (B).
- the wireless communication system includes the first wireless station and the wireless resource adjustment unit.
- the first wireless station includes a wireless transmission / reception unit capable of transmitting / receiving a wireless signal.
- the radio resource adjustment unit may be the non-registered one that is not registered in advance among the plurality of second radio stations based on a history of connection requests that have arrived at the radio transmission / reception unit from the plurality of second radio stations.
- Radio resource used for communication between at least one of the plurality of second radio stations and the radio transceiver is adjusted using the connection request frequency for each radio station as an index.
- the radio resource adjustment unit included in the radio communication system of this aspect may be arranged in the first radio station, or may be arranged in a network to which the first radio station is communicably connected. Good.
- the large value of the connection request frequency by a non-registered radio station that is not registered in advance in the radio station apparatus according to the second aspect of the present invention described above is that there are frequent unregistered radio stations near the radio station apparatus. Means to exist. Therefore, the magnitude of the connection request frequency by an unregistered radio station can be used as an index that indirectly indicates the degree of interference between a signal transmitted / received by an unregistered radio station and a signal transmitted / received by the radio station apparatus. it can.
- radio resources are adjusted using the frequency of connection requests by unregistered radio stations as an index. For this reason, it is possible to adjust radio resources so as to suppress interference with external radio signals transmitted and received between the non-registered radio station and other radio stations according to the connection request frequency by the non-registered radio station. it can. That is, according to the first to fourth aspects of the present invention, the occurrence of interference with a radio signal transmitted / received by an unregistered radio station is estimated based on an index that is relatively easy to measure the connection request frequency by the unregistered radio station. And the interference can be effectively suppressed.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system including a femto base station 1 according to the present embodiment.
- the radio communication system according to the present embodiment will be described on the assumption that it is a W-CDMA radio communication system more specifically than FDD (Frequency Division Dupulex) -CDMA.
- FDD Frequency Division Dupulex
- the femto base station 1 forms a femto cell 2. Further, the femto base station 1 has a function of restricting mobile stations that can be connected to itself.
- the mobile station 3-1 connects to the femto base station 1 and performs communication. That is, the mobile station 3-1 is a mobile station that is permitted to connect to the femto base station 1.
- a mobile station that is permitted to connect to the femto base station 1 including the mobile station 3-1 is referred to as a “registered mobile station”.
- unregistered mobile stations mobile stations that are not permitted to connect to the femto base station 1 including the mobile station 3-2 are referred to as “unregistered mobile stations”.
- the femto gateway device 4 is connected to the femto base station 1.
- the femto gateway apparatus 4 is also connected to the upper network 5 and controls communication with the mobile station 3 existing in the femtocell 2 formed by the upper network 5 and the subordinate femto base station 1. Transfer information.
- the femto base station 1 when the femto base station 1 according to the present embodiment receives a connection request from an unregistered mobile station and rejects the connection request, the femto base station 1 is configured to save a connection request history by the unregistered mobile station.
- the femto base station 1 calculates the frequency of connection requests by unregistered mobile stations (hereinafter referred to as connection request frequency) by referring to the connection request history, and wirelessly uses the connection request frequency by unregistered mobile stations as an index. Determine the need for resource coordination.
- the radio resource is a radio resource used between the femto base station 1 and the registered mobile station.
- the unregistered mobile station is another radio station (for example, another femto base station or a macro base station that forms an upper layer macro cell).
- Radio resources are adjusted so as to suppress interference with external radio signals transmitted / received between them.
- Specific examples of radio resources to be adjusted include the maximum value of the total transmission power of all downlink channels transmitted by the femto base station 1 within the femto cell 2, the frequency band used, and the like.
- FIG. 1 shows only a small number of elements for the convenience of explanation of the present invention. That is, the radio communication system according to the present embodiment may include a femto base station and a mobile station in addition to the one shown in FIG. 1, an upper layer macro cell formed so as to cover the femto cell 2, and this May be included.
- FIG. 2 is a block diagram illustrating a configuration of the femto base station 1.
- the radio transmission / reception unit 11 receives an uplink signal transmitted from the mobile station via the antenna 10 and outputs a downlink signal transmitted to the mobile station to the antenna 10.
- Radio parameters related to radio resources used when the radio transceiver unit 11 transmits and receives radio signals are specified by the radio network controller 15 described later.
- Specific examples of radio parameters specified by the radio network control unit 15 include the frequency band to be used, the transmission power Ptx of the common pilot signal CPICH, the maximum value Ptx_total_max of the total transmission power of all downlink channels, and uplink data transmission from the mobile station.
- the target value RTWP_target etc. of the total received power (Received Total Wideband Power).
- the reception data processing unit 12 decodes the uplink channel 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 to the mobile station from the wired transmission / reception unit 14, performs processing such as error correction coding and interleaving, and then supplies the data to the wireless transmission / reception unit 11.
- the wired transmission / reception unit 14 functions as an interface for transmitting / receiving upstream data and downstream data to / from the femto gateway device 4.
- the radio network controller 15 has a function of a radio network controller (RNC: Radio Network Controller), such as the frequency band to be used, the transmission power of the common pilot signal CPICH, the maximum value of the total transmission power of all downlink channels, and the like. Are supplied to the wireless transmission / reception unit 11.
- RNC Radio Network Controller
- the transmission power of the common pilot signal CPICH is determined by the radio network control data setting unit 17 described later.
- the radio network control unit 15 adjusts the maximum value Ptx_total_max of the total transmission power of all downlink channels using the history of connection requests by unregistered mobile stations accumulated in the connection request history storage unit 19 described later.
- Ptx_total_max A specific example of the procedure for adjusting Ptx_total_max using the history of connection requests by unregistered mobile stations will be described later.
- the mobile station mode receiving unit 16 measures the received power Pmacro of a common pilot signal transmitted from a macro base station (not shown) forming a macro cell (not shown) overlaid on the femtocell 2 via the antenna 10. To do.
- the radio network control data setting unit 17 receives the Pmacro notification measured by the mobile station mode reception unit 16, determines the transmission power Ptx of the common pilot signal by the femto base station 1, and sends these to the radio network control unit 15.
- a method for determining the transmission power Ptx of the common pilot signal according to the reception power Pmacro of the common pilot signal transmitted from the macro base station has been previously filed by Patent Document 1 or the applicant of the present application.
- Japanese Patent Application No. 2007-263050 (filed on Oct. 9, 2007). For this reason, detailed description of the method for determining the transmission power Ptx of the common pilot signal is omitted here.
- the mobile station mode receiving unit 16 and the wireless network control data setting unit 17 described above are not necessary components for carrying out the present invention.
- the mobile station mode reception unit 16 and the radio network control data setting unit 17 perform the common pilot signal of the femto base station 1 according to the reception power Pmacro of the common pilot signal transmitted by the macro base station (not shown). Is provided to determine the transmission power Ptx. Therefore, if the femto base station 1 does not need to perform such an independent setting operation for the transmission power of the common pilot signal, the mobile station mode receiving unit 16 and the radio network control data setting unit 17 may be omitted. Good.
- the connection control unit 18 receives a connection request transmitted from the mobile station to the femto base station 1 via the antenna 10, the wireless transmission / reception unit 11, the reception data processing unit 12, the wired transmission / reception unit 14, and the wireless network control unit 15.
- the connection request transmitted from the mobile station include an incoming call from the mobile station, reception of a location registration request transmitted from the mobile station along with a cell selection operation when the mobile station is powered on, and the mobile station Reception of a location registration request transmitted from a mobile station in association with a cell reselection operation at the time of cell change.
- the connection control unit 18 determines whether or not connection to the femto base station 1 is possible depending on whether or not the connection request source mobile station is a registered mobile station.
- connection control unit 18 maintains a permission list (not shown) in which the mobile station ID of the registered mobile station is recorded, and collates the mobile station ID included in the connection request received from the mobile station with the permission list. It may be determined whether or not connection is possible.
- the connection control unit 18 accumulates the history in the connection request history storage unit 19 when a connection request by an unregistered mobile station is rejected. Specifically, time information indicating the date and time when a connection request by an unregistered mobile station is received, the mobile station ID of the request source, and the like may be stored in the connection request history storage unit 19. Of course, the connection control unit 18 may store not only the history when the connection is refused but also the history when the connection is permitted in accordance with the connection request history storage unit 19.
- FIGS. 3 and 4 are flowcharts showing a specific example of the adjustment procedure of the downlink total transmission power Ptx_total_max.
- connection control unit 18 records the connection request history (connection request date and time, mobile station ID) by the unregistered mobile station in the connection request history storage unit 19.
- step S12 the wireless network control unit 15 calculates a connection request frequency F1 for each unregistered mobile station identified by the mobile station ID.
- a connection request frequency F1 for example as follows. That is, a non-registered mobile station such as the mobile station 3-2 is configured not to transmit a new connection request to the base station whose connection is refused during a predetermined prohibition period.
- the period for collecting the connection request history to calculate the connection request frequency F1 may be set longer than this prohibition period. By setting in this way, it is possible to avoid a situation in which unregistered mobile stations transmit connection requests frequently and continuously.
- step S13 the wireless network control unit 15 determines whether or not the connection request frequencies F1 for each unregistered mobile station are below the threshold Th1. If the connection request frequency F1 of at least one unregistered mobile station is equal to or greater than the threshold Th1 in the determination (NO in step S13), the radio network controller 15 determines the maximum value Ptx_total_max of the total transmission power of all downlink channels. Is reduced from the normal value P1 to P2 (step S14).
- step S15 the radio network controller 15 determines whether or not the maximum value Ptx_total_max of the total transmission power is reduced from the normal value P1 as a result of the past determination process.
- the radio network control unit 15 performs a transmission power recovery process (step S16).
- step S21 the connection request frequency F2 of the unregistered mobile stations that has caused the connection request frequency F1 to exceed the threshold Th1 and reduce the maximum value Ptx_total_max of the total transmission power is tabulated. Note that the frequency F1 calculated in step S12 of FIG. 3 may be reused for the unregistered mobile station that has caused the reduction factor of Ptx_total_max without calculating the frequency F2 again.
- step S22 it is determined whether or not the connection request frequency F2 is lower than the threshold Th2.
- the threshold value Th2 may be set to a value smaller than the threshold value Th1 described above.
- step S23 the maximum value Ptx_total_max of the total transmission power is increased by ⁇ P.
- ⁇ P is a step size for recovering Ptx_total_max, so it may be a relatively small value for careful recovery of Ptx_total_max, and a relatively large value for quick recovery of Ptx_total_max. And it is sufficient.
- ⁇ P does not have to be a constant value in the entire period of the recovery process of Ptx_total_max, and may be gradually increased or gradually decreased. Further, ⁇ P may be changed according to the magnitude of the connection request frequency F2. Specifically, ⁇ P may be increased as the connection request frequency F2 is decreased. As a result, the maximum value Ptx_total_max of the total transmission power can be quickly recovered under a situation where the connection request frequency F2 is small and the probability that there is an unregistered mobile station is low.
- the recovery rate of the maximum value Ptx_total_max of the total transmission power can be moderated under a situation where the connection request frequency F2 is large and it is assumed that there is a high probability that an unregistered mobile station exists in the vicinity.
- the wireless network control unit 15 may periodically execute the adjustment procedure shown in FIGS.
- FIG. 5A is a graph showing the connection request frequency F1 of a certain unregistered mobile station in time series.
- FIG. 5B is a graph showing the maximum value Ptx_total_max of the total transmission power adjusted by periodically executing the procedure shown in FIGS.
- the femto base station 1 adjusts radio resources using the frequency of connection requests by unregistered mobile stations as an index.
- a large value of the connection request frequency by unregistered mobile stations means that unregistered mobile stations frequently exist in the vicinity of the femto base station 1. Therefore, the magnitude of the connection request frequency by the unregistered mobile station can be used as an index indicating the degree of occurrence of interference between the signal transmitted / received by the femto base station 1 and the signal transmitted / received by the unregistered mobile station.
- the femto base station 1 is able to detect interference between the transmission / reception signal of the non-registered mobile station and the transmission / reception signal of the own station as shown in FIG. It can be estimated that the femto base station 1 is installed in a frequently occurring situation.
- the femto base station 1 reduces the maximum value Ptx_total_max of the total transmission power when the frequency of connection requests by non-registered mobile stations increases using the frequency of connection requests by unregistered mobile stations as an index. As a result, the femto base station 1 transmits / receives a signal transmitted / received by an unregistered mobile station to / from another wireless station (for example, another femto base station or a macro base station forming an upper layer macro cell). Generation of interference with signals can be effectively suppressed.
- another wireless station for example, another femto base station or a macro base station forming an upper layer macro cell.
- the adjustment procedure for the maximum value Ptx_total_max of the total transmission power shown in FIGS. 3 and 4 is only an example.
- Ptx_total_max by adjusting the connection request frequency by unregistered mobile stations with a multi-stage threshold, adjustment is made so that Ptx_total_max gradually decreases as the connection request frequency by unregistered mobile stations increases. You may go.
- parameters related to radio resources that are adjusted based on the frequency of connection requests by unregistered mobile stations are parameters that can suppress interference with signals transmitted and received by neighboring radio stations by changing them.
- the femto base station 1 may change the frequency band used for wireless communication with a registered mobile station when the occurrence of interference is estimated based on the frequency of connection requests by unregistered mobile stations.
- the radio resource adjustment procedure shown in FIGS. 3 and 4 can be realized by causing a computer such as a microprocessor to execute a program for base station control.
- the computer that executes the base station control program may be configured to perform reference control of connection request history, calculation of connection request frequency, and increase / decrease control of the maximum value Ptx_total_max of total transmission power.
- this program can be stored in various types of storage media, and can be transmitted via a communication medium.
- the storage medium includes, for example, a flexible disk, a hard disk, a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD, a ROM cartridge, a RAM memory cartridge with battery backup, a flash memory cartridge, a nonvolatile RAM cartridge, and the like.
- the communication medium includes a wired communication medium such as a telephone line, a wireless communication medium such as a microwave line, and the Internet.
- the femto base station according to the present embodiment adjusts radio resources using the connection request frequency by unregistered mobile stations as an index.
- the detailed procedure of radio resource adjustment is different from that of the femto base station 1 described above.
- the configuration of the femto base station according to the present embodiment may be the same as the configuration of the femto base station 1 illustrated in FIG. For this reason, the duplicate description regarding the structure of the femto base station concerning this Embodiment is abbreviate
- the component names and reference numerals of the femto base station 1 shown in FIG. 2 are used.
- the femto base station uses the total frequency FT of connection requests by all unregistered mobile stations as an index for radio resource adjustment in addition to the connection request frequency F1 for each unregistered mobile station.
- the total frequency FT is the total number of connection requests made by unregistered mobile stations during a unit period of history aggregation, and is equal to the total value of connection request frequencies F1 for each non-registered mobile station described above.
- the table in FIG. 6 shows the determination conditions used for radio resource adjustment by the radio network controller 15 included in the femto base station according to the present embodiment, and the radio resource adjustment contents when the determination conditions are satisfied.
- the femto base station When the frequency F1 is smaller than the threshold Th1 and the total frequency FT is smaller than the threshold Th3, the femto base station according to the present embodiment maintains the maximum value Ptx_total_max of the total transmission power as P1 (upper left in FIG. 6). When conditions are met). If the maximum value Ptx_total_max of the total transmission power is being reduced, recovery processing is performed.
- the threshold value Th3 for the total frequency FT may be a value larger than the threshold value Th1 described above. Note that when performing the recovery process of Ptx_total_max, the determination using the threshold Th2 described in the first embodiment of the invention may be further performed.
- the femto base station reduces the maximum value Ptx_total_max of the total transmission power to P2 when the frequency F1 is equal to or higher than the threshold Th1 and the total frequency FT is smaller than the threshold Th3 (lower left in FIG. 6). When the condition is satisfied). This is equivalent to the adjustment procedure of the femto base station 1 described above.
- the femto base station reduces the maximum value Ptx_total_max of the total transmission power to P2 when the frequency F1 is smaller than the threshold Th1 and the total frequency FT is equal to or greater than the threshold Th3 (see FIG. 6). (When the upper right condition is met).
- the femto base station changes the use frequency band when the frequency F1 is equal to or higher than the threshold Th1 and the total frequency FT is equal to or higher than the threshold Th3 (when the condition at the lower right in FIG. 6 is satisfied). ).
- the degree of interference with transmission / reception signals of unregistered mobile stations can be further increased.
- the femto base station according to the present embodiment can more reliably avoid interference when both the frequency F1 and the total frequency FT are larger than when only one of them is large. Execute.
- the adjustment method shown in FIG. 6 for changing the used frequency band when the frequency F1 and the total frequency FT are both large is an example.
- the femto base station according to the present embodiment reduces the maximum value Ptx_total_max of the total transmission power more greatly than when only one of them is large. May be. Even with such an adjustment method, interference can be avoided more reliably.
- connection request history storage unit 19 may be realized as a memory device that can be attached to and detached from the femto base station 1 such as a memory card.
- the connection request history storage unit 19 may be stored in an external storage device accessible by the femto base station 1 or may be stored in a device arranged in the network 5.
- the femto base station 1 may not include the connection control unit 18.
- the function of the connection control unit 18 may be arranged in the network 5.
- the femto base station 1 may transfer the connection request received from the mobile station to the upper network 5 and receive the authentication result of the mobile station from the network 5.
- the femto base station 1 does not necessarily have the RNC function, and the RNC function may be arranged in the network 5.
- FIG. 7 is a block diagram showing a configuration of the femto base station 6 according to the present embodiment.
- the femto base station 6 receives notification of radio parameters such as a use frequency to be applied to the radio transmission / reception unit 11 and transmission power of the common pilot signal from the RNC arranged in the upper network 5. Further, the femto base station 6 transfers the connection request received from the mobile station to the upper network 5 and receives the authentication result of the mobile station from the network 5.
- the radio resource adjustment unit 61 adjusts radio resources using the frequency of connection requests by unregistered mobile stations as an index. Specifically, the radio resource adjustment unit 61 may adjust the maximum value Ptx_total_max of the total transmission power according to the procedures of the flowcharts shown in FIGS. Note that the radio resource adjustment unit 61 may refer to the connection request history stored in the upper network 5, and in this case, step S11 of FIG. 3 is omitted.
- the determination of the necessity of radio resource adjustment using the connection request frequency may be executed by a device arranged in the upper network 5, for example, the RNC.
- the radio resource adjustment unit 61 may receive a radio resource adjustment instruction from the network 5 and perform radio resource adjustment according to the adjustment instruction. That is, whether or not the mobile station can be connected to the femto base station 6, the connection request history is retained, and the determination of the necessity of radio resource adjustment using the connection request history is performed between the femto base station 6 and the upper network 5 to which it is connected. It is possible to share arbitrarily between.
- an unregistered mobile station forms another radio station (for example, another femto base station or a macro cell in an upper layer).
- another radio station for example, another femto base station or a macro cell in an upper layer.
- connection control unit 18 may provide a restriction so as to permit connection of the unregistered mobile station within a predetermined upper limit number.
- connection control unit 18 rejects the connection request when the connection request arrives exceeding the upper limit number, and stores the history indicating the fact that the connection request is rejected in the connection request history storage unit 19. That's fine.
- the radio network control unit 15 may determine whether or not radio resource adjustment is necessary based on the occurrence history of connection request rejection.
- connection control unit 18 may perform communication restrictions such as limiting communication contents of unregistered mobile stations compared to registered mobile stations.
- An example of communication content restriction is to suppress the communication speed of an unregistered mobile station to be lower than that of a registered mobile station.
- the connection control unit 18 may store in the connection request history storage unit 19 the reception history of connection requests from unregistered mobile stations that are subject to communication restrictions.
- the radio network controller 15 may determine whether or not radio resources need to be adjusted based on the reception history of connection requests from unregistered mobile stations that are subject to communication restrictions.
- the wireless communication system to which the present invention is applied is not particularly limited.
- the present invention can also be applied to a wireless communication system that employs a TDD (Time Division Duplex) method in which the same radio frequency is divided in time and used on the uplink and downlink.
- the present invention can be applied to a wireless communication system using the E-UTRAN system instead of the W-CDMA system.
- the radio resource block PRB may be changed instead of changing the use frequency band described above.
- the present invention can also be applied to each of a plurality of wireless stations that autonomously form a wireless ad hoc network, for example.
- the present invention can be used for 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 移動局(登録移動局)
3-2 移動局(非登録移動局)
4 フェムトゲートウェー装置
5 ネットワーク
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 無線ネットワーク制御部
16 移動局モード受信部
17 無線ネットワーク制御データ設定部
18 接続制御部
19 接続要求履歴保存部
61 無線リソース調整部
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。
本実施の形態にかかるフェムト基地局は、上述したフェムト基地局1と同様に、非登録移動局による接続要求頻度を指標として無線リソースの調整を行なう。しかしながら、無線リソース調整の詳細手順が、上述したフェムト基地局1と相違する。なお、本実施の形態にかかるフェムト基地局の構成は、図2に示したフェムト基地局1の構成と同様とすればよい。このため、本実施の形態にかかるフェムト基地局の構成に関する重複説明は省略する。また、本実施の形態にかかるフェムト基地局の構成要素に言及する際には、図2に示したフェムト基地局1の構成要素名及び参照符号を使用する。
上述した発明の実施の形態1乃至3では、接続要求の送信元が「登録移動局」であるか否かによってフェムト基地局1又は6への接続を許可する場合について説明した。しかしながら、フェムト基地局1及び6は、接続要求の送信元移動局が「非登録移動局」であってもフェムト基地局1及び6への接続を許可してもよい。このとき、接続制御部18は、予め定められた上限台数の範囲内で非登録移動局の接続を許可するよう制限を設けてもよい。この場合には、接続制御部18は、上限台数を超えて接続要求が到着した場合にその接続要求を拒否するとともに、接続要求を拒否した事実を示す履歴を接続要求履歴保存部19に保存すればよい。また、この場合、無線ネットワーク制御部15は、接続要求拒否の発生履歴に基づいて、無線リソースの調整要否を判定すればよい。
Claims (30)
- 複数の第2の無線局から第1の無線局に対してなされた接続要求の履歴を記録するステップ(a)と、
前記複数の第2の無線局のうち前記第1の無線局に予め登録されていない非登録無線局毎の接続要求頻度を指標として、前記複数の第2の無線局の少なくとも1つと前記第1の無線局との間の通信に使用される無線リソースの調整の実行を決定するステップ(b)と、
を含む無線リソースの制御方法。 - 前記ステップ(b)において、前記第1の無線局は、前記非登録無線局毎の接続要求頻度の少なくとも1つが第1の閾値を上回る場合に前記無線リソース調整の実行を決定する、請求項1に記載の無線リソースの制御方法。
- 前記無線リソースの調整は、前記複数の第2の無線局の少なくとも1つと前記第1の無線局との間の通信に使用される無線リソースを、前記非登録無線局と他の無線局との間で送受信される外部無線信号との干渉を抑制するように変更することを含む、請求項1又は2に記載の無線リソースの制御方法。
- 前記無線リソースの調整は、前記第1の無線局が前記複数の第2の無線局の少なくとも1つに対して送信する下り送信出力の最大値を低減すること、及び前記第1の無線局と前記複数の第2の無線局の少なくとも1つとの間の使用周波数帯域を変更することの少なくとも一方を含む、請求項3に記載の無線リソースの制御方法。
- 前記無線リソースの調整として、前記下り送信出力の最大値を低減させるステップ(c)と、
前記下り送信出力の最大値を低減させた後に、先に前記第1の閾値を超えた特定の非登録無線局について新たに求めた接続要求頻度が前記第1の閾値以下に設定された第2の閾値を下回る場合に、前記下り送信出力の最大値を漸次増大させるステップ(d)と、
をさらに含む請求項4に記載の無線リソースの制御方法。 - 前記ステップ(b)において、さらに、前記第1の無線局は、複数の前記非登録無線局全体による接続要求の総頻度を求め、
前記非登録無線局毎の接続要求頻度の少なくとも1つが前記第1の閾値を上回る第1の条件、及び前記総頻度が第3の閾値を上回る第2の条件が共に成立する場合には、前記第1及び第2の条件のいずれか一方のみが成立する場合に比べて、前記外部無線信号との干渉がより一層抑制されるように前記無線リソースを変更するための無線リソース調整の実行を決定する、請求項3又は4に記載の無線リソースの制御方法。 - 前記第1の無線局は、前記第1及び第2の条件のいずれか一方のみが成立する場合に前記下り送信出力の最大値の低減を決定し、前記第1及び第2の条件が共に成立する場合に前記使用周波数帯域の変更を決定する、請求項4に従属する請求項6に記載の無線リソースの制御方法。
- 前記第1の無線局は、前記第1及び第2の条件が共に成立する場合に、前記第1及び第2の条件のいずれか一方のみが成立する場合に比べて前記下り送信出力の最大値を大きく低減させる、請求項4に従属する請求項6に記載の無線リソースの制御方法。
- 前記非登録無線局は、前記第1の無線局への接続が拒否される無線局、予め定められた上限台数の範囲内で前記第1の無線局への接続が許可される無線局、又は前記登録無線局に比べて前記第1の無線局との通信内容が制限される無線局である、請求項1乃至7のいずれか1項に記載の無線リソースの制御方法。
- 無線送受信手段と、
複数の対向無線局によってなされた接続要求の履歴に基づき、前記複数の対向無線局のうち予め登録されていない非登録無線局毎の接続要求頻度を指標として、前記複数の対向無線局の少なくとも1つとの間の前記無線送受信手段を介した通信に使用される無線リソースの調整を行なう無線リソース調整手段と、
を備える無線局装置。 - 前記無線リソース調整手段は、前記非登録無線局毎の接続要求頻度の少なくとも1つが第1の閾値を上回る場合に前記無線リソースを調整する、請求項10に記載の無線局装置。
- 前記無線リソースの調整は、前記複数の対向無線局の少なくとも1つと前記第1の無線局との間の通信に使用される無線リソースを、前記非登録無線局と他の無線局との間で送受信される外部無線信号との干渉を抑制するように変更することを含む、請求項10又は11に記載の無線局装置。
- 前記無線リソースの調整は、前記無線送受信手段から前記複数の対向無線局の少なくとも1つに対して送信される下り送信出力の最大値を低減すること、及び前記無線局送信手段と前記複数の対向無線局の少なくとも1つとの間の使用周波数帯域を変更することの少なくとも一方を含む、請求項12に記載の無線局装置。
- 前記無線リソース調整手段は、
前記非登録無線局毎の接続要求頻度の少なくとも1つが前記第1の閾値を上回る場合に、前記下り送信出力の最大値を低減させ、
前記下り送信出力の最大値を低減させた後に、先に前記第1の閾値を超えた特定の非登録無線局について新たに求めた接続要求頻度が前記第1の閾値以下に設定された第2の閾値を下回る場合に、前記下り送信出力の最大値を漸次増大させる、請求項13に記載の無線局装置。 - 前記無線リソース調整手段は、
前記非登録無線局毎の接続要求頻度に加えて複数の前記非登録無線局全体による接続要求の総頻度を求め、
前記非登録無線局毎の接続要求頻度の少なくとも1つが前記第1の閾値を上回る第1の条件、及び前記総頻度が第3の閾値を上回る第2の条件が共に成立する場合には、前記第1及び第2の条件のいずれか一方のみが成立する場合に比べて、前記外部無線信号との干渉がより一層抑制されるように前記無線リソースの調整を行なう、請求項12又は13に記載の無線局装置。 - 前記無線リソース調整手段は、前記第1及び第2の条件のいずれか一方のみが成立する場合に前記下り送信出力の最大値を低減させ、前記第1及び第2の条件が共に成立する場合に前記使用周波数帯域を変更する、請求項13に従属する請求項15に記載の無線局装置。
- 前記無線リソース調整手段は、前記第1及び第2の条件が共に成立する場合に、前記第1及び第2の条件のいずれか一方のみが成立する場合に比べて前記下り送信出力の最大値を大きく低減させる、請求項13に従属する請求項15に記載の無線局装置。
- 前記無線送受信手段を介して前記接続要求を受信した場合に、前記対向無線局の接続可否を判定する接続制御手段をさらに備える請求項10乃至17のいずれか1項に記載の無線局装置。
- 前記非登録無線局は、前記無線局装置への接続が拒否される無線局、予め定められた上限台数の範囲内で前記無線局装置への接続が許可される無線局、又は前記登録無線局に比べて前記無線局装置との通信内容が制限される無線局である、請求項10乃至18のいずれか1項に記載の無線局装置。
- 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、
複数の対向無線局から前記無線局装置に対してなされた接続要求の履歴を記録する処理(a)と、
前記複数の対向無線局のうち前記無線局装置に予め登録されていない非登録無線局毎の接続要求頻度を指標として、前記複数の対向無線局の少なくとも1つと前記無線局装置との間の通信に使用される無線リソースの調整の実行を決定する処理(b)と、
を含む、無線局制御プログラムを格納した記録媒体。 - 前記処理(b)では、前記非登録無線局毎の接続要求頻度の少なくとも1つが第1の閾値を上回る場合に前記無線リソース調整の実行を決定する、請求項20に記載の無線局制御プログラムを格納した記録媒体。
- 前記無線リソースの調整は、前記複数の対向無線局の少なくとも1つと前記第1の無線局との間の通信に使用される無線リソースを、前記非登録無線局と他の無線局との間で送受信される外部無線信号との干渉を抑制するように変更することを含む、請求項20又は21に記載の無線局制御プログラムを格納した記録媒体。
- 前記無線リソースの調整は、前記無線局装置が前記複数の対向無線局の少なくとも1つに対して送信する下り送信出力の最大値を低減すること、及び前記無線局装置と前記複数の対向無線局の少なくとも1つとの間の使用周波数帯域を変更することの少なくとも一方を含む、請求項22に記載の無線局制御プログラムを格納した記録媒体。
- 前記制御処理は、
前記無線リソース調整として、前記下り送信出力の最大値の低減を指示する処理(c)と、
前記下り送信出力の最大値を低減させた後に、先に前記第1の閾値を超えた特定の非登録無線局について新たに求めた接続要求頻度が前記第1の閾値以下に設定された第2の閾値を下回る場合に、前記下り送信出力の最大値の漸次増大を指示する処理(d)と、
をさらに含む、請求項23に記載の無線局制御プログラムを格納した記録媒体。 - 前記処理(b)は、複数の前記非登録無線局全体による接続要求の総頻度を求める処理をさらに含み、
前記非登録無線局毎の接続要求頻度の少なくとも1つが前記第1の閾値を上回る第1の条件、及び前記総頻度が第3の閾値を上回る第2の条件が共に成立する場合には、前記第1及び第2の条件のいずれか一方のみが成立する場合に比べて、前記外部無線信号との干渉がより一層抑制されるように前記無線リソースを変更するための無線リソース調整の実行を決定する、請求項22又は23に記載の無線局制御プログラムを格納した記録媒体。 - 前記処理(b)では、前記第1及び第2の条件のいずれか一方のみが成立する場合に前記下り送信出力の最大値の低減を決定し、前記第1及び第2の条件が共に成立する場合に前記使用周波数帯域の変更を決定する、請求項23に従属する請求項25に記載の無線局制御プログラムを格納した記録媒体。
- 前記処理(b)では、前記第1及び第2の条件が共に成立する場合に、前記第1及び第2の条件のいずれか一方のみが成立する場合に比べて前記下り送信出力の最大値を大きく低減することを決定する、請求項23に従属する請求項25に記載の無線局制御プログラムを格納した記録媒体。
- 無線信号を送受信可能な無線送受信手段を有する第1の無線局と、
前記第1の無線局が前記無線送受信手段を介して対向無線局から接続要求を受信した場合に、前記対向無線局が前記第1の無線局に予め登録されている登録無線局であるか又は予め登録されていない非登録無線局であるかに基づいて、前記対向無線局の前記第1の無線局への接続可否を判定する接続制御手段と、
複数の前記対向無線局によってなされた接続要求の履歴に基づき、前記非登録無線局毎の接続要求頻度を指標として、前記複数の対向無線局の少なくとも1つとの間の前記無線送受信手段を介した通信に使用される無線リソースの調整を行なう無線リソース調整手段と、
を備える無線通信システム。 - 第1の無線局及び複数の第2の無線局を備える無線通信システムであって、
前記第1の無線局は、
無線送受信手段と、
前記複数の第2の無線局から前記無線送受信手段に到達した接続要求の履歴に基づき、前記複数の第2の無線局のうち予め登録されていない前記非登録無線局毎の接続要求頻度を指標として、前記複数の第2の無線局の少なくとも1つと前記無線送受信手段との間の通信に使用される無線リソースの調整を行なう無線リソース調整手段とを備える、
無線通信システム。 - 前記第2の無線局は、前記第1の無線局への接続が制限された場合に、前記第1の無線局に対する新たな接続要求の送信を予め定められた禁止期間の間行なわないよう構成され、
前記第1の無線局が前記接続要求頻度を求めるために前記履歴を集計する期間は、前記禁止期間より長く設定される、請求項29に記載の無線通信システム。
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CN200980107179.8A CN101960893B (zh) | 2008-03-26 | 2009-02-12 | 无线电资源控制方法、无线电台站设备、存储无线电台站控制程序的记录介质及无线电通信系统 |
US12/920,282 US8688158B2 (en) | 2008-03-26 | 2009-02-12 | Radio resource control method, radio station apparatus, recording medium storing radio station control program, and radio communication system |
EP09725617.6A EP2259636B1 (en) | 2008-03-26 | 2009-02-12 | Radio resource control method, radio station device, recording medium containing radio station control program, and radio communication system |
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US (1) | US8688158B2 (ja) |
EP (1) | EP2259636B1 (ja) |
JP (1) | JP5212466B2 (ja) |
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WO2011136267A1 (ja) * | 2010-04-30 | 2011-11-03 | 三菱電機株式会社 | 移動体通信システム |
JP2011239186A (ja) * | 2010-05-11 | 2011-11-24 | Sugihara Software And Electron Industry Co Ltd | 無線アクセスポイントおよびそれを用いたセンサネットワークシステム |
JP2012050038A (ja) * | 2010-08-30 | 2012-03-08 | Kddi Corp | 無線通信システム、基地局装置、無線通信方法、及びプログラム |
JP2012074820A (ja) * | 2010-09-28 | 2012-04-12 | Kddi Corp | 基地局装置およびプログラム |
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Also Published As
Publication number | Publication date |
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EP2259636A1 (en) | 2010-12-08 |
EP2259636A4 (en) | 2014-09-03 |
US20110009147A1 (en) | 2011-01-13 |
CN101960893A (zh) | 2011-01-26 |
CN101960893B (zh) | 2014-06-04 |
JPWO2009119173A1 (ja) | 2011-07-21 |
EP2259636B1 (en) | 2018-11-14 |
JP5212466B2 (ja) | 2013-06-19 |
US8688158B2 (en) | 2014-04-01 |
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