WO2011148637A1 - Mobile station, wireless communication system, mobile station parameter transmission method and base station parameter setting method in wireless communication system - Google Patents

Mobile station, wireless communication system, mobile station parameter transmission method and base station parameter setting method in wireless communication system Download PDF

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Publication number
WO2011148637A1
WO2011148637A1 PCT/JP2011/002925 JP2011002925W WO2011148637A1 WO 2011148637 A1 WO2011148637 A1 WO 2011148637A1 JP 2011002925 W JP2011002925 W JP 2011002925W WO 2011148637 A1 WO2011148637 A1 WO 2011148637A1
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WIPO (PCT)
Prior art keywords
base station
mobile station
radio signal
parameter value
base stations
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PCT/JP2011/002925
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French (fr)
Japanese (ja)
Inventor
俊介 工藤
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京セラ株式会社
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Publication of WO2011148637A1 publication Critical patent/WO2011148637A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a mobile station, a radio communication system, a parameter value transmission method for a mobile station, and a parameter value setting method for a base station in the radio communication system.
  • the measurer measures the radio field intensity and the like with a measuring device at the position where the radio signal from the base station arrives.
  • the measurer requests the operator of the operator center to change the value of the transmission power by telephone or the like. The operator of the operator center receiving this request changes the value of the transmission power of the base station. As a result, a new value is set for the transmission power.
  • the measurer needs to continuously measure the radio field intensity of the base station and keep in contact with the operator by telephone or the like until a desired measurement result is obtained. Therefore, it takes time and effort to change the parameter value.
  • the base station transmits the values of its own parameters (transmission power, bit error rate indicating service quality, etc.) to the maintenance terminal (mobile station) for changing parameter values. Based on the transmitted parameter value, the user of the maintenance terminal or the maintenance terminal itself determines the necessity of changing the parameter value. If the parameter value needs to be changed, a change instruction is transmitted from the maintenance terminal to the base station, and the parameter value is changed by the base station.
  • the conventional method assumes that one mobile station changes the parameter value of one base station. Therefore, when there are multiple base stations that need to change parameter values, the mobile station can receive radio waves from each base station (cell) in order to ensure communication with the base station. However, it must be located near the base station and move between cells. Therefore, the more base stations that need to change the parameter value, the longer the moving distance of the mobile station, and much time is required to change the parameter values of a plurality of base stations.
  • a cell of a certain base station and a cell of a base station adjacent to the base station overlap in the vicinity of each cell edge (boundary of a region where radio waves from the base station reach). Therefore, in a region where a plurality of cells overlap (hereinafter referred to as a cell edge vicinity region), the mobile station may be able to communicate with a plurality of base stations.
  • the cell edge vicinity region is a region away from the base station, the communication environment is bad.
  • the transmission power of the mobile station is smaller than that of the base station, data from the base station can be received, but it is likely that data cannot be transmitted to the base station.
  • radio signals from a plurality of base stations may interfere with each other.
  • the parameter value is changed from the information acquired by the base station itself, and the communication environment in the cell edge vicinity region is not considered.
  • a mobile station can transmit a parameter value to be changed to a certain base station, but cannot transmit to a certain base station.
  • the mobile station avoids the area near the cell edge and moves by selecting an area that can communicate with the base station.
  • an object of the present invention made in view of the above-described problems is to provide a mobile station, a wireless communication system, and a mobile that allow one mobile station to change parameter values to a plurality of base stations in a cell edge vicinity region.
  • a parameter value transmission method for a station and a parameter value setting method for a base station in a wireless communication system is provided.
  • the mobile station is A mobile station that obtains information about a parameter value to be used when transmitting a radio signal and wirelessly communicates with a base station that sets the parameter value, A mobile station receiver for receiving radio signals; A reception quality acquisition unit for acquiring the reception quality of the radio signal received by the mobile station reception unit; A calculation unit for calculating a parameter value used when the base station transmits a radio signal; A mobile station transmitter that transmits a radio signal including information on the parameter value calculated by the calculator; With When the mobile station receiver receives radio signals from a plurality of base stations, The calculation unit calculates a parameter value of each base station based on reception quality of the radio signal from the plurality of base stations, The mobile station transmission unit transmits a radio signal including information on the parameter values of all the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations. It is characterized by this.
  • the wireless communication system is A wireless communication system comprising a plurality of base stations connected to each other via a network, and a mobile station that connects to the plurality of base stations and performs wireless communication,
  • Each base station of the plurality of base stations is A base station receiver for receiving radio signals;
  • a base station transmitter for transmitting radio signals;
  • An inter-base station transmission / reception unit for transmitting / receiving data to / from another base station connected to the local station via the network
  • the base station receiving unit receives a radio signal including information on a parameter value used when transmitting a radio signal from the mobile station, the base station receiving unit sets a parameter value related to the own station and transmits / receives between the base stations A base station controller that transmits information on parameter values not related to the own station to other base stations,
  • the mobile station A mobile station receiver that receives a radio signal transmitted from the base station transmitter;
  • a reception quality acquisition unit for acquiring the reception quality of the radio signal received by the mobile station reception unit;
  • a calculation unit that calculates
  • the solution of the present invention has been described as an apparatus.
  • the present invention can be realized as a method, a program, and a storage medium that stores the program substantially corresponding to these, and the scope of the present invention. It should be understood that these are also included.
  • a parameter value transmission method for a mobile station that implements the first aspect of the present invention as a method, In a parameter value transmission method of a mobile station that obtains information about a parameter value used when transmitting a radio signal and wirelessly communicates with a base station that sets the parameter value, Receiving radio signals from a plurality of base stations; Obtaining reception quality of the radio signal; Calculating a parameter value to be used when each base station transmits a radio signal based on the reception quality; Transmitting a radio signal including information on the parameter values of all of the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations; Is included.
  • a parameter value setting method of a base station in a wireless communication system that realizes the second aspect of the present invention as a method,
  • the mobile station is Receiving radio signals from the plurality of base stations; Obtaining reception quality of the radio signal; Calculating a parameter value to be used when each base station transmits a radio signal based on the reception quality; Transmitting a radio signal including information on the parameter values of all of the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations;
  • the base station is Receiving a radio signal including information on the parameter value; Setting a parameter value related to the own station among the parameter values; And transmitting information related to parameter values not related to the own station among the parameter values to another base station.
  • a plurality of bases are transmitted only to the base station that has transmitted a radio signal whose reception quality satisfies the required quality.
  • a radio signal containing information on parameter values for all stations is transmitted.
  • the base station sets only the parameter value related to the own station in the information, and transmits the parameter value not related to the own station to other base stations.
  • FIG. 1 is a functional block diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a positional relationship between a mobile station and a base station according to an embodiment of the present invention.
  • FIG. 3 is a flowchart showing processing of the mobile station according to the embodiment of the present invention.
  • FIG. 4 is a flowchart showing processing of the base station according to the embodiment of the present invention.
  • FIG. 5 is a sequence diagram until the parameter values of the base station according to the embodiment of the present invention are set.
  • FIG. 1 is a functional block diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention.
  • a wireless communication system 101 includes a mobile station 111 and a base station 141.
  • the mobile station 111 is a wireless communication terminal such as a mobile phone or PHS.
  • the base station 141 performs wireless communication with the mobile station 111.
  • an eNB evolved node Node B
  • LTE Long Termination Evolution
  • AN Access network
  • HRPD High Rate Packet Data
  • the mobile station 111 includes a mobile station antenna 113, a mobile station communication unit 115, and a mobile station control unit 117.
  • the mobile station communication unit 115 includes a mobile station reception unit 119 that receives a radio signal from the base station 141 via the mobile station antenna 113, and a mobile station that transmits a radio signal to the base station 141 via the mobile station antenna 113.
  • the radio signal transmitted by the mobile station transmission unit 121 includes, for example, information on parameter values used when the base station 141 transmits a radio signal.
  • the parameter value used when the base station 141 transmits a radio signal is, for example, an optimum value or a specified value such as transmission power, communication rate, or preamble length.
  • the information on the parameter value can include ID (Identification) information of the base station that needs to change the parameter value. Therefore, even if information on parameter values of a plurality of base stations is transmitted together, the base station side can distinguish information for each base station based on the ID information.
  • the mobile station control unit 117 controls and manages the entire mobile station 111 including each functional block of the mobile station 111.
  • the mobile station control unit 117 is configured as software executed on any suitable processor such as a CPU (Central Processing Unit), or by a dedicated processor (for example, DSP (Digital Signal Processor)) specialized for each process. It can also be configured.
  • the mobile station control unit 117 includes a maintenance target base station setting unit 123, an access target base station setting unit 125, an ID acquisition unit 127, a reception quality acquisition unit 129, and a calculation unit 131. Shall be provided.
  • the maintenance target base station setting unit 123 determines a base station that needs maintenance, that is, a parameter value change.
  • the access target base station setting unit 125 determines a base station to which the mobile station 111 transmits information on parameter values.
  • the ID acquisition unit 127 acquires ID information from the radio signal received by the mobile station reception unit 119, and specifies which base station the radio signal is from.
  • the reception quality acquisition unit 129 acquires the reception quality of the radio signal received by the mobile station reception unit 119, for example, the radio wave intensity at reception and the bit error rate. Based on the reception quality acquired by the reception quality acquisition unit 129, the calculation unit 131 determines a parameter value used when the base station transmits a radio signal.
  • the parameter value is, for example, an optimal transmission power value with good reception quality and capable of suppressing radio signal interference from a plurality of base stations.
  • the base station 141 includes a base station antenna 143, a base station communication unit 145, an inter-base station transmission / reception unit 146, and a base station control unit 147.
  • the X2 interface is an interface between radio base stations defined by 3GPP (3rd Generation Partnership Project).
  • the network connection by the X2 interface between the base stations is realized by a wire, and provides a stable communication environment as compared with the wireless network between the mobile station and the base station.
  • the base station communication unit 145 includes a base station receiving unit 149 that receives a radio signal from the mobile station 111 via the base station antenna 143, and a base station that transmits a radio signal to the mobile station 111 via the base station antenna 143.
  • the inter-base station transmission / reception unit 146 transmits / receives data to / from another base station connected to the own station via the network. Data is, for example, information regarding parameter values used when each base station transmits a radio signal.
  • the base station control unit 147 controls and manages the entire base station 141 including each functional block of the base station 141.
  • the base station control unit 147 is configured as software executed on an arbitrary suitable processor such as a CPU (Central Processing Unit), or by a dedicated processor (for example, DSP (Digital Signal Processor)) specialized for each process. It can also be configured.
  • the base station control unit 147 includes a parameter value acquisition unit 153 and a parameter value setting unit 155.
  • the parameter value acquisition unit 153 acquires a parameter value related to the own station from information regarding the parameter value received by the base station reception unit 149 or the inter-base station transmission / reception unit 146, and sends the acquired information to the parameter value setting unit 155. .
  • the parameter value acquisition unit 153 sends information regarding parameter values not related to the own station to the inter-base station transmission / reception unit 146. Whether the received information is related to the own station is determined based on the ID information included in the information.
  • the parameter value acquisition unit 153 can extract only information related to the own station even when the received information includes information on a plurality of base stations.
  • the parameter value setting unit 155 sets the parameter value related to the own station transmitted from the parameter value acquisition unit 153. As a result, the parameter value is changed.
  • FIG. 2 is a diagram illustrating a positional relationship between a mobile station and a base station according to an embodiment of the present invention.
  • FIG. 3 is a flowchart showing processing of the mobile station according to the embodiment of the present invention.
  • FIG. 4 is a flowchart showing processing of the base station according to the embodiment of the present invention.
  • FIG. 5 is a sequence diagram until the parameter values of the base station according to the embodiment of the present invention are set.
  • the parameter value setting of the three base stations in a situation where the mobile station 111 and the three base stations 141a, 141b, and 141c are located as shown in FIG. 2 will be described.
  • a is used as a reference code of the functional block related to the base station 141a
  • b is used as a reference code of the functional block related to the base station 141b
  • the reference numerals of the functional blocks related to the above will be described with c added.
  • the parameter value is a value of transmission power of the base stations 141a to 141c.
  • an area 161a indicates a range (cell) within which the radio wave of the base station 141a can reach.
  • An area 161b indicates a range in which radio waves of the base station 141b can reach.
  • An area 161c indicates a range where radio waves of the base station 141c can reach.
  • the overlapping area is referred to as a cell edge vicinity area.
  • the mobile station 111 can receive radio signals (radio waves) from the plurality of base stations 141a to 141c.
  • the areas 161a to 161c do not guarantee that radio waves reach from the mobile station 111 to the base stations 141a to 141c.
  • the mobile station 111 Since the mobile station 111 has a smaller transmission output than the base stations 141a to 141c, there are cases where even if the mobile station 111 can receive the radio signals from the base stations 141a to 141c, it cannot transmit the radio signals to the base stations 141a to 141c. In particular, in the area near the cell edge, there is a high possibility that the mobile station 111 cannot transmit a radio signal to the base stations 141a to 141c.
  • the maintenance target base station setting unit 123 sets a base station (maintenance target base station) whose parameter value (transmission power value) should be changed (step S101 and 1 in FIG. 5).
  • the maintenance target base station setting unit 123 sets the base stations 141a to 141c as base stations that need to change parameter values.
  • the present invention is not limited to setting the maintenance target base station in advance, and the maintenance target base station setting unit 123 sets the maintenance target base station according to the reception quality of the radio signal from the base stations 141a to 141c. And can be changed.
  • the mobile station 111 moves to an area (cell edge vicinity area A) where radio signals transmitted from the base station transmitters 151 of all the base stations 141a to 141c can be received, and can receive radio signals from the base stations 141a to 141c. It is determined whether or not (step S102 and 2 in FIG. 5). Whether or not the radio signals can be received from all the base stations 141a to 141c is determined by the ID acquisition unit 127 from the ID information of the base stations 141a to 141c included in the radio signals.
  • the reception quality acquisition unit 129 The reception quality of the radio signal received by 119 is acquired (step S103 and 3 in FIG. 5).
  • the reception quality is, for example, the radio wave intensity at the reception point or the data error rate.
  • the reception quality is not limited to the quality of a radio signal related to one reception.
  • Reception quality acquisition section 129 can also specify the average value of the quality of radio signals received over a plurality of times as the reception quality. For example, the average value of the quality of the radio signal acquired every 3 seconds for 10 minutes can be specified as the reception quality.
  • the access target base station setting unit 125 specifies the base station that has transmitted the radio signal whose reception quality satisfies the required quality (step S104 and 4 in FIG. 5).
  • the required quality is a reception environment required for the mobile station 111 to communicate with the base stations 141a to 141c, and is defined by, for example, threshold values relating to reception power, data error rate, and the like.
  • the access target base station setting unit 125 sets, as an access target base station, a base station that has transmitted a radio signal whose reception quality satisfies the required quality.
  • the mobile station 111 Since the mobile station 111 is located in an area where the radio signals can be received from the plurality of base stations 141a to 141c, that is, in the cell edge vicinity area A, depending on the transmission power of the mobile station 111 and the radio signal interference, the mobile station 111 may There is a possibility that information cannot be transmitted to the base stations 141a to 141c. Therefore, if the reception quality of the radio signal from the base station is good, it is determined that the mobile station is likely to be able to transmit the radio signal to the base station, and the base station that transmitted the radio signal that satisfies the required quality is accessed. Set as the target base station. The mobile station 111 sends information on the parameter value to the base station selected for access.
  • the access target base station setting unit 125 determines whether the reception quality satisfies the required quality every time the reception quality of the radio signal varies, The access target can be changed.
  • the base station 141a is the only base station that transmits a radio signal whose reception quality satisfies the required quality.
  • the calculation unit 131 calculates the parameter values of the base stations 141a to 141c based on the reception quality acquired by the reception quality acquisition unit 129 (step S105 and 5 in FIG. 5). For example, the calculation unit 131 considers the distance between the mobile station 111 and the base stations 141a to 141c, and the transmission power of the base station increases when the radio field intensity at the reception point is smaller than a desired value. Parameter values can be specified. Alternatively, the calculation unit 131 can designate a parameter value that reduces the transmission power of the base station when the radio wave intensity at the reception point is greater than a desired value. The calculation unit 131 can also determine an optimal transmission power value from the reception quality, the degree of radio signal interference from a plurality of base stations, and the like.
  • the calculation unit 131 sends the calculated parameter value to the mobile station communication unit 115 in association with the ID information of the base stations 141a to 141c.
  • the mobile station transmission unit 121 transmits a radio signal including the parameter values of all the maintenance target base stations 141a to 141c and related ID information to the access target base station 141a via the mobile station antenna 113 (step S106 and FIG. 5). 6).
  • the base station receiver 149a of the base station 141a receives a radio signal including a parameter value and related ID information from the mobile station 111 via the base station antenna 143a (step S111). Then, the parameter value acquisition unit 153a of the base station control unit 147a acquires only the parameter value related to the own station from the received information based on the ID information of the base stations 141a to 141c (step S112). Thereafter, the parameter value acquisition unit 153a sends the acquired parameter value to the parameter value setting unit 155a, and sends the parameter value not related to the own station and the related ID information to the inter-base station transmission / reception unit 146a.
  • the parameter value setting unit 155a sets the parameter value acquired by the parameter value acquisition unit 153a to the corresponding parameter of the own station (Step S113 and 7 in FIG. 5).
  • the value of the transmission power is transmitted from the mobile station 111 as a parameter value
  • the value of the transmission power of the radio signal transmitted from the base station 141a to the mobile station 111 is changed in step S113.
  • the inter-base station transceiver unit 146a transmits all the information to the inter-base station transceiver unit 146b of the other base station 141b via the X2 interface. Transmit (step S114 and 8 in FIG. 5).
  • the transmission destination to which the base station 141a transmits information related to parameter values not related to the own station is not limited to the base station 141b, and can be transmitted to the base station 141c.
  • the base station 141a does not transmit all the information related to the parameter values not related to the own station to the base station 141b or 141c, but only the information related to the base station 141b is transmitted to the base station 141b based on the ID information. Only information can be transmitted to the base station 141c.
  • the base station 141b When the inter-base station transmission / reception unit 146b of the base station 141b receives information on the parameter value from the base station 141a (step S111), the base station 141b relates to the parameter value related to its own station, as in the processing in the base station 141a. Only information is acquired and set (steps S112 and S113 and 9 in FIG. 5). Further, the base station 141b transmits information on parameter values not related to the own station to the other base station 141c (step S114, 10 in FIG. 5). When the base station 141c sets the parameter values in the same manner as the base station 141b (11 in FIG. 5), the setting of the parameter values of all the base stations 141a to 141c is completed.
  • the calculation unit 131 calculates the parameter value of each base station from the reception quality of the radio signals. Then, a radio signal including information on parameter values of all the base stations 141a to 141c is transmitted to the base station 141a that has transmitted the radio signal whose reception quality satisfies the required quality.
  • the base station control unit 147 sets a parameter value related to the own station, and the inter-base station transmitting / receiving unit 146 relates to a parameter value not related to the own station. Information is transmitted to another base station 141b.
  • the mobile station 111 located in the cell edge vicinity region receives radio signals from the three base stations 141a to 141c whose parameter values are to be changed, and receives radio signals including information on the parameter values in one base station 141a.
  • Base stations 141b and 141c that do not receive information on parameter values from the mobile station 111 can acquire and change parameter values from the base station 141a or b by inter-base station connection through the X2 interface. Therefore, if the mobile station 111 can perform bidirectional communication with at least one mobile station 111, it is possible to change parameter values of a plurality of base stations.
  • the mobile station 111 transmits the parameter values one by one in the vicinity of the cell edge as a radio signal.
  • the parameter values to be changed more efficiently can be delivered to the base stations 141a to 141c.
  • each member each means, each step, etc.
  • functions included in each member, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined or divided into one. Is possible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed are a mobile station, a wireless communication system, a mobile station parameter transmission method and a base station parameter setting method in the wireless communication system, wherein, in a region near the cell edge, one mobile station is capable of changing the parameters in multiple base stations in a cell edge proximity region. In response to acquiring information relating to parameters used during transmission of a wireless signal, a mobile station (111) communicates wirelessly with the base station which sets said parameters. When a mobile station receiving unit (119) receives wireless signals from multiple base stations, a reception quality acquisition unit (129) acquires the reception quality of said wireless signals, a calculation unit (131) calculates the parameters of each base station on the basis of the reception quality of the wireless signals from the multiple base stations, and a mobile station transmission unit (121) transmits a wireless signal containing information relating to the parameters of all of the base stations to those base stations which transmitted a wireless signals having reception quality meeting a prescribed level.

Description

移動局、無線通信システム、移動局のパラメータ値送信方法及び無線通信システムにおける基地局のパラメータ値設定方法Mobile station, radio communication system, mobile station parameter value transmission method, and base station parameter value setting method in radio communication system 関連出願へのクロスリファレンスCross-reference to related applications
　本出願は、日本国特許出願２０１０－１２０８３３号（２０１０年５月２６日出願）の優先権を主張するものであり、当該出願の開示全体を、ここに参照のために取り込む。 This application claims the priority of Japanese Patent Application No. 2010-120833 (filed on May 26, 2010), the entire disclosure of which is incorporated herein by reference.
　本発明は、移動局、無線通信システム、移動局のパラメータ値送信方法及び無線通信システムにおける基地局のパラメータ値設定方法に関するものである。 The present invention relates to a mobile station, a radio communication system, a parameter value transmission method for a mobile station, and a parameter value setting method for a base station in the radio communication system.
　基地局の新設時、基地局が保持する各種パラメータには仮の値が設定されているため、新設直後に現実の通信環境に照らし合わせて各種パラメータ値を微調整する必要がある。また、通信環境は、新たな基地局の新設や、建造物の増減等により変化するものであるため、新設後にもパラメータ値の調整は必要となる。基地局の送信電力の値（パラメータ値）を調整する場合は、まず、測定者が、基地局からの無線信号が届く位置で、電波強度などを測定機器で測定する。測定結果より調整が必要な場合は、測定者は、電話等によってオペレータセンターのオペレータに送信電力の値の変更を要求する。この要求を受けたオペレータセンターのオペレータが、基地局の送信電力の値を変更する。これにより、送信電力に新しい値が設定される。 When a new base station is established, temporary values are set for various parameters held by the base station. Therefore, it is necessary to fine-tune various parameter values in light of the actual communication environment immediately after the establishment. In addition, since the communication environment changes due to the establishment of a new base station, increase / decrease in buildings, etc., it is necessary to adjust parameter values even after the establishment of a new base station. When adjusting the value (parameter value) of the transmission power of the base station, first, the measurer measures the radio field intensity and the like with a measuring device at the position where the radio signal from the base station arrives. When adjustment is necessary based on the measurement result, the measurer requests the operator of the operator center to change the value of the transmission power by telephone or the like. The operator of the operator center receiving this request changes the value of the transmission power of the base station. As a result, a new value is set for the transmission power.
　当該方法では、測定者は、基地局の電波強度を測定し続け、所望の測定結果が得られるまで、オペレータと電話等で連絡を取り続ける必要がある。そのため、パラメータ値変更に手間と時間がかかる。 In this method, the measurer needs to continuously measure the radio field intensity of the base station and keep in contact with the operator by telephone or the like until a desired measurement result is obtained. Therefore, it takes time and effort to change the parameter value.
　そのため、従来、オペレータセンターのオペレータを介在させずにパラメータ値を変更する方法が提案されている（例えば、特許文献１参照）。当該方法では、基地局が自局のパラメータ（送信パワーやサービス品質を示すビット誤り率など）の値をパラメータ値変更用の保守端末（移動局）に送信する。送信されてきたパラメータ値を基に、保守端末の使用者又は保守端末自体がパラメータ値の変更の必要性を判断する。パラメータ値の変更が必要であれば、変更指示が保守端末から基地局に送信され、基地局によってパラメータ値が変更される。 Therefore, conventionally, a method of changing parameter values without involving an operator of an operator center has been proposed (see, for example, Patent Document 1). In this method, the base station transmits the values of its own parameters (transmission power, bit error rate indicating service quality, etc.) to the maintenance terminal (mobile station) for changing parameter values. Based on the transmitted parameter value, the user of the maintenance terminal or the maintenance terminal itself determines the necessity of changing the parameter value. If the parameter value needs to be changed, a change instruction is transmitted from the maintenance terminal to the base station, and the parameter value is changed by the base station.
特開２００２－２４６９９０号公報JP 2002-246990 A
　しかし、従来の方法は、１つの移動局が１つの基地局のパラメータ値を変更することを想定している。そのため、パラメータ値の変更を必要とする基地局が複数存在する場合、移動局は、基地局と確実に通信を行うことができるようにするために、各基地局からの電波が届く領域（セル）でも基地局近傍に位置しなければならず、セル間を移動することになる。そのため、パラメータ値の変更を必要とする基地局が多いほど、移動局の移動距離は長くなり、複数の基地局のパラメータ値を変更するためには、多大な時間が必要となる。 However, the conventional method assumes that one mobile station changes the parameter value of one base station. Therefore, when there are multiple base stations that need to change parameter values, the mobile station can receive radio waves from each base station (cell) in order to ensure communication with the base station. However, it must be located near the base station and move between cells. Therefore, the more base stations that need to change the parameter value, the longer the moving distance of the mobile station, and much time is required to change the parameter values of a plurality of base stations.
　一般的に、ある基地局のセルと、当該基地局に隣接する基地局のセルとは、各セルエッジ（基地局からの電波が届く領域の境界）近傍で重なり合っている。そのため、複数のセルが重なり合っている領域（以下、セルエッジ近傍領域とする）では、移動局が複数の基地局と通信できる可能性がある。しかし、セルエッジ近傍領域は、基地局から離れた領域であるため通信環境が悪い。特に、移動局の送信パワーは基地局より小さいため、基地局からのデータは受信できるが、基地局にデータを送信できないということが起こりやすい。また、セルエッジ近傍領域では、複数の基地局からの無線信号が干渉する恐れもある。そのため、パラメータ値の変更は、セルエッジ近傍領域での通信環境を考慮して変更することが望ましい。しかし、従来の方法では、基地局自身が取得した情報からパラメータ値を変更しており、セルエッジ近傍領域での通信環境は考慮されていない。また、不安定な通信環境であるセルエッジ近傍領域においては、移動局が、ある基地局には変更すべきパラメータ値を送信できるが、ある基地局には送信できないということが起こる。この場合、移動局は、通信できなかった基地局のパラメータ値を変更するために、セルエッジ近傍領域を避け、当該基地局と通信できる領域を選んで移動することになる。 Generally, a cell of a certain base station and a cell of a base station adjacent to the base station overlap in the vicinity of each cell edge (boundary of a region where radio waves from the base station reach). Therefore, in a region where a plurality of cells overlap (hereinafter referred to as a cell edge vicinity region), the mobile station may be able to communicate with a plurality of base stations. However, since the cell edge vicinity region is a region away from the base station, the communication environment is bad. In particular, since the transmission power of the mobile station is smaller than that of the base station, data from the base station can be received, but it is likely that data cannot be transmitted to the base station. Further, in the region near the cell edge, radio signals from a plurality of base stations may interfere with each other. Therefore, it is desirable to change the parameter value in consideration of the communication environment in the cell edge vicinity region. However, in the conventional method, the parameter value is changed from the information acquired by the base station itself, and the communication environment in the cell edge vicinity region is not considered. Further, in a cell edge vicinity region that is an unstable communication environment, a mobile station can transmit a parameter value to be changed to a certain base station, but cannot transmit to a certain base station. In this case, in order to change the parameter value of the base station that could not communicate, the mobile station avoids the area near the cell edge and moves by selecting an area that can communicate with the base station.
　従って、上記のような問題点に鑑みてなされた本発明の目的は、セルエッジ近傍領域で、１つの移動局が複数の基地局にパラメータ値を変更させることのできる移動局、無線通信システム、移動局のパラメータ値送信方法及び無線通信システムにおける基地局のパラメータ値設定方法を提供することにある。 Accordingly, an object of the present invention made in view of the above-described problems is to provide a mobile station, a wireless communication system, and a mobile that allow one mobile station to change parameter values to a plurality of base stations in a cell edge vicinity region. A parameter value transmission method for a station and a parameter value setting method for a base station in a wireless communication system.
　上述した諸課題を解決すべく、第１の観点による移動局は、
　無線信号を送信する際に利用するパラメータ値に関する情報を取得して、当該パラメータ値を設定する基地局と無線通信する移動局であって、
　無線信号を受信する移動局受信部と、
　前記移動局受信部により受信された無線信号の受信品質を取得する受信品質取得部と、
　前記基地局が無線信号を送信する際に利用するパラメータ値を算出する算出部と、
　前記算出部により算出された前記パラメータ値に関する情報を含む無線信号を送信する移動局送信部と、
を備え、
　前記移動局受信部が複数の基地局からの無線信号を受信すると、
　　前記算出部は、前記複数の基地局からの前記無線信号の受信品質に基づいて各基地局のパラメータ値を算出し、
　　前記移動局送信部は、前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信する
ことを特徴とするものである。 In order to solve the above-described problems, the mobile station according to the first aspect is
A mobile station that obtains information about a parameter value to be used when transmitting a radio signal and wirelessly communicates with a base station that sets the parameter value,
A mobile station receiver for receiving radio signals;
A reception quality acquisition unit for acquiring the reception quality of the radio signal received by the mobile station reception unit;
A calculation unit for calculating a parameter value used when the base station transmits a radio signal;
A mobile station transmitter that transmits a radio signal including information on the parameter value calculated by the calculator;
With
When the mobile station receiver receives radio signals from a plurality of base stations,
The calculation unit calculates a parameter value of each base station based on reception quality of the radio signal from the plurality of base stations,
The mobile station transmission unit transmits a radio signal including information on the parameter values of all the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations. It is characterized by this.
　また、第２の発明による無線通信システムは、
　ネットワークを介して互いに接続されている複数の基地局と、前記複数の基地局と接続して無線通信を行う移動局と、から構成される無線通信システムであって、
　前記複数の基地局の各基地局は、
　　無線信号を受信する基地局受信部と、
　　無線信号を送信する基地局送信部と、
　　前記ネットワークを介して自局と接続されている他の基地局とデータを送受信する基地局間送受信部と、
　　前記基地局受信部が、前記移動局から無線信号を送信する際に利用するパラメータ値に関する情報を含む無線信号を受信すると、自局に関係するパラメータ値を設定し、且つ、前記基地局間送受信部に、自局に関係しないパラメータ値に関する情報を他の基地局へ送信させる基地局制御部と、を備え、
　前記移動局は、
　　前記基地局送信部から送信された無線信号を受信する移動局受信部と、
　　前記移動局受信部により受信された無線信号の受信品質を取得する受信品質取得部と、
　　基地局が無線信号を送信する際に利用するパラメータ値を算出する算出部と、
　　前記算出部により算出された前記パラメータ値に関する情報を含む無線信号を送信する移動局送信部と、を備え、
　前記複数の基地局からの無線信号が前記移動局受信部により受信されると、
　　前記算出部は、前記複数の基地局の前記無線信号の受信品質に基づいて各基地局のパラメータ値を算出し、
　　前記移動局送信部は、前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信する
ことを特徴とするものである。 The wireless communication system according to the second invention is
A wireless communication system comprising a plurality of base stations connected to each other via a network, and a mobile station that connects to the plurality of base stations and performs wireless communication,
Each base station of the plurality of base stations is
A base station receiver for receiving radio signals;
A base station transmitter for transmitting radio signals;
An inter-base station transmission / reception unit for transmitting / receiving data to / from another base station connected to the local station via the network
When the base station receiving unit receives a radio signal including information on a parameter value used when transmitting a radio signal from the mobile station, the base station receiving unit sets a parameter value related to the own station and transmits / receives between the base stations A base station controller that transmits information on parameter values not related to the own station to other base stations,
The mobile station
A mobile station receiver that receives a radio signal transmitted from the base station transmitter;
A reception quality acquisition unit for acquiring the reception quality of the radio signal received by the mobile station reception unit;
A calculation unit that calculates a parameter value used when the base station transmits a radio signal;
A mobile station transmitter that transmits a radio signal including information on the parameter value calculated by the calculator,
When radio signals from the plurality of base stations are received by the mobile station receiver,
The calculation unit calculates a parameter value of each base station based on reception quality of the radio signals of the plurality of base stations,
The mobile station transmission unit transmits a radio signal including information on the parameter values of all the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations. It is characterized by this.
　上述したように本発明の解決手段を装置として説明してきたが、本発明はこれらに実質的に相当する方法、プログラム、プログラムを記録した記憶媒体としても実現し得るものであり、本発明の範囲にはこれらも包含されるものと理解されたい。 As described above, the solution of the present invention has been described as an apparatus. However, the present invention can be realized as a method, a program, and a storage medium that stores the program substantially corresponding to these, and the scope of the present invention. It should be understood that these are also included.
　例えば、本発明の第１の観点を方法として実現させた移動局のパラメータ値送信方法は、
　無線信号を送信する際に利用するパラメータ値に関する情報を取得して、当該パラメータ値を設定する基地局と無線通信する移動局のパラメータ値送信方法において、
　複数の基地局からの無線信号を受信するステップと、
　前記無線信号の受信品質を取得するステップと、
　前記受信品質に基づいて各基地局が無線信号を送信する際に利用するパラメータ値を算出するステップと、
　前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信するステップと、
を含むものである。 For example, a parameter value transmission method for a mobile station that implements the first aspect of the present invention as a method,
In a parameter value transmission method of a mobile station that obtains information about a parameter value used when transmitting a radio signal and wirelessly communicates with a base station that sets the parameter value,
Receiving radio signals from a plurality of base stations;
Obtaining reception quality of the radio signal;
Calculating a parameter value to be used when each base station transmits a radio signal based on the reception quality;
Transmitting a radio signal including information on the parameter values of all of the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations;
Is included.
　また、本発明の第２の観点を方法として実現させた無線通信システムにおける基地局のパラメータ値設定方法は、
　ネットワークを介して互いに接続されている複数の基地局と、前記複数の基地局と接続して無線通信を行う移動局と、から構成される無線通信システムにおける基地局のパラメータ値設定方法において、
　前記移動局が、
　　前記複数の基地局からの無線信号を受信するステップと、
　　前記無線信号の受信品質を取得するステップと、
　　前記受信品質に基づいて各基地局が無線信号を送信する際に利用するパラメータ値を算出するステップと、
　　前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信するステップと、
　前記基地局が、
　　前記パラメータ値に関する情報を含む無線信号を受信するステップと、
　　前記パラメータ値のうち自局に関係するパラメータ値を設定するステップと、
　　前記パラメータ値のうち自局に関係しないパラメータ値に関する情報を他の基地局へ送信するステップと
を含むものである。 Further, a parameter value setting method of a base station in a wireless communication system that realizes the second aspect of the present invention as a method,
In the parameter value setting method of a base station in a wireless communication system composed of a plurality of base stations connected to each other via a network and a mobile station connected to the plurality of base stations and performing wireless communication,
The mobile station is
Receiving radio signals from the plurality of base stations;
Obtaining reception quality of the radio signal;
Calculating a parameter value to be used when each base station transmits a radio signal based on the reception quality;
Transmitting a radio signal including information on the parameter values of all of the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations;
The base station is
Receiving a radio signal including information on the parameter value;
Setting a parameter value related to the own station among the parameter values;
And transmitting information related to parameter values not related to the own station among the parameter values to another base station.
　上記のように構成された本発明に係る移動局、無線通信システム及び無線通信システムにおけるパラメータ値設定方法によれば、受信品質が所要品質を満たす無線信号を送信した基地局のみへ、複数の基地局全てのパラメータ値に関する情報を含む無線信号が送信される。また、基地局は、当該情報のうち自局に関係するパラメータ値のみを設定し、自局に関係しないパラメータ値は他の基地局に送信する。これにより、セルエッジ近傍領域において、少なくとも１つの基地局と通信できれば、複数の移動局のパラメータ値を変更することができる。 According to the mobile station, the radio communication system, and the parameter value setting method in the radio communication system according to the present invention configured as described above, a plurality of bases are transmitted only to the base station that has transmitted a radio signal whose reception quality satisfies the required quality. A radio signal containing information on parameter values for all stations is transmitted. Also, the base station sets only the parameter value related to the own station in the information, and transmits the parameter value not related to the own station to other base stations. As a result, parameter values of a plurality of mobile stations can be changed if communication with at least one base station is possible in the cell edge vicinity region.
図１は、本発明の一実施形態に係る無線通信システムの概略構成を示す機能ブロック図である。FIG. 1 is a functional block diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention. 図２は、本発明の一実施形態に係る移動局と基地局との位置関係を示す図である。FIG. 2 is a diagram illustrating a positional relationship between a mobile station and a base station according to an embodiment of the present invention. 図３は、本発明の一実施形態に係る移動局の処理を示すフローチャートである。FIG. 3 is a flowchart showing processing of the mobile station according to the embodiment of the present invention. 図４は、本発明の一実施形態に係る基地局の処理を示すフローチャートである。FIG. 4 is a flowchart showing processing of the base station according to the embodiment of the present invention. 図５は、本発明の一実施形態に係る基地局のパラメータ値が設定されるまでのシーケンス図である。FIG. 5 is a sequence diagram until the parameter values of the base station according to the embodiment of the present invention are set.
　以下、本発明に係る一実施形態について、図面を参照して説明する。 Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
　図１は、本発明の一実施形態に係る無線通信システムの概略構成を示す機能ブロック図である。本発明の一実施形態に係る無線通信システム１０１は、移動局１１１と基地局１４１とで構成されている。移動局１１１は、携帯電話やＰＨＳといった無線通信端末である。基地局１４１は、移動局１１１と無線通信を行うもので、例えば、ＬＴＥ（Long Term Evolution）システムではｅＮＢ（evolved Node B）、ＨＲＰＤ（High Rate Packet Data：高速パケットデータ）システムではＡＮ（Access Network）と称されるものである。 FIG. 1 is a functional block diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention. A wireless communication system 101 according to an embodiment of the present invention includes a mobile station 111 and a base station 141. The mobile station 111 is a wireless communication terminal such as a mobile phone or PHS. The base station 141 performs wireless communication with the mobile station 111. For example, an eNB (evolved node Node B) in an LTE (Long Termination Evolution) system and an AN (Access network) in an HRPD (High Rate Packet Data) system. ).
　移動局１１１は、移動局アンテナ１１３と、移動局通信部１１５と、移動局制御部１１７とで構成されている。移動局通信部１１５は、移動局アンテナ１１３を介して基地局１４１からの無線信号を受信する移動局受信部１１９と、移動局アンテナ１１３を介して基地局１４１への無線信号を送信する移動局送信部１２１とを備えている。移動局送信部１２１が送信する無線信号には、例えば、基地局１４１が無線信号を送信する際に利用するパラメータ値に関する情報が含まれる。基地局１４１が無線信号を送信する際に利用するパラメータ値とは、例えば送信電力、通信レート又はプリアンブル長などの最適値又は指定値などである。パラメータ値に関する情報には、パラメータ値の変更が必要な基地局のＩＤ（Identification）情報も含めることができる。そのため、複数の基地局のパラメータ値に関する情報をまとめて送信しても、基地局側では、ＩＤ情報を基に情報を基地局毎に区別することができる。移動局制御部１１７は、移動局１１１の各機能ブロックをはじめとして移動局１１１の全体を制御及び管理している。移動局制御部１１７は、ＣＰＵ（中央処理装置）等の任意の好適なプロセッサ上で実行されるソフトウェアとして構成したり、処理ごとに特化した専用のプロセッサ（例えばＤＳＰ（デジタルシグナルプロセッサ））によって構成したりすることもできる。 The mobile station 111 includes a mobile station antenna 113, a mobile station communication unit 115, and a mobile station control unit 117. The mobile station communication unit 115 includes a mobile station reception unit 119 that receives a radio signal from the base station 141 via the mobile station antenna 113, and a mobile station that transmits a radio signal to the base station 141 via the mobile station antenna 113. A transmission unit 121. The radio signal transmitted by the mobile station transmission unit 121 includes, for example, information on parameter values used when the base station 141 transmits a radio signal. The parameter value used when the base station 141 transmits a radio signal is, for example, an optimum value or a specified value such as transmission power, communication rate, or preamble length. The information on the parameter value can include ID (Identification) information of the base station that needs to change the parameter value. Therefore, even if information on parameter values of a plurality of base stations is transmitted together, the base station side can distinguish information for each base station based on the ID information. The mobile station control unit 117 controls and manages the entire mobile station 111 including each functional block of the mobile station 111. The mobile station control unit 117 is configured as software executed on any suitable processor such as a CPU (Central Processing Unit), or by a dedicated processor (for example, DSP (Digital Signal Processor)) specialized for each process. It can also be configured.
　本発明の一実施形態に係る移動局制御部１１７は、保守対象基地局設定部１２３と、アクセス対象基地局設定部１２５と、ＩＤ取得部１２７と、受信品質取得部１２９と、算出部１３１とを備えるものとする。保守対象基地局設定部１２３は、保守、つまりパラメータ値の変更が必要な基地局を決定する。アクセス対象基地局設定部１２５は、移動局１１１がパラメータ値に関する情報を送信する基地局を決定する。ＩＤ取得部１２７は、移動局受信部１１９が受信した無線信号からＩＤ情報を取得し、どの基地局からの無線信号であるかを特定する。受信品質取得部１２９は、移動局受信部１１９で受信された無線信号の受信品質、例えば、受信時の電波強度やビット誤り率などを取得する。算出部１３１は、受信品質取得部１２９により取得された受信品質を基に、基地局が無線信号を送信する際に利用するパラメータ値を決定する。パラメータ値とは、例えば受信品質が良く、且つ複数の基地局からの無線信号の干渉を抑えられる最適な送信電力値である。 The mobile station control unit 117 according to an embodiment of the present invention includes a maintenance target base station setting unit 123, an access target base station setting unit 125, an ID acquisition unit 127, a reception quality acquisition unit 129, and a calculation unit 131. Shall be provided. The maintenance target base station setting unit 123 determines a base station that needs maintenance, that is, a parameter value change. The access target base station setting unit 125 determines a base station to which the mobile station 111 transmits information on parameter values. The ID acquisition unit 127 acquires ID information from the radio signal received by the mobile station reception unit 119, and specifies which base station the radio signal is from. The reception quality acquisition unit 129 acquires the reception quality of the radio signal received by the mobile station reception unit 119, for example, the radio wave intensity at reception and the bit error rate. Based on the reception quality acquired by the reception quality acquisition unit 129, the calculation unit 131 determines a parameter value used when the base station transmits a radio signal. The parameter value is, for example, an optimal transmission power value with good reception quality and capable of suppressing radio signal interference from a plurality of base stations.
　基地局１４１は、基地局アンテナ１４３と、基地局通信部１４５と、基地局間送受信部１４６と、基地局制御部１４７とで構成されている。基地局１４１は複数存在し、基地局間送受信部１４６（Ｘ２インタフェース）によって、ネットワークを介して基地局同士接続されている。Ｘ２インタフェースとは、３ＧＰＰ（3rd Generation Partnership Project）で規定された無線基地局間インタフェースのことである。基地局同士のＸ２インタフェースによるネットワーク接続は、有線により実現され、移動局と基地局との間の無線ネットワークに比べると、安定した通信環境を提供するものである。基地局通信部１４５は、基地局アンテナ１４３を介して移動局１１１からの無線信号を受信する基地局受信部１４９と、基地局アンテナ１４３を介して移動局１１１への無線信号を送信する基地局送信部１５１とを備えている。基地局間送受信部１４６は、ネットワークを介して自局と接続されている他の基地局とデータを送受信する。データとは、例えば、各基地局が無線信号を送信する際に利用するパラメータ値に関する情報である。基地局制御部１４７は、基地局１４１の各機能ブロックをはじめとして基地局１４１の全体を制御及び管理している。基地局制御部１４７は、ＣＰＵ（中央処理装置）等の任意の好適なプロセッサ上で実行されるソフトウェアとして構成したり、処理ごとに特化した専用のプロセッサ（例えばＤＳＰ（デジタルシグナルプロセッサ））によって構成したりすることもできる。 The base station 141 includes a base station antenna 143, a base station communication unit 145, an inter-base station transmission / reception unit 146, and a base station control unit 147. There are a plurality of base stations 141, and the base stations are connected to each other via a network by an inter-base station transceiver unit 146 (X2 interface). The X2 interface is an interface between radio base stations defined by 3GPP (3rd Generation Partnership Project). The network connection by the X2 interface between the base stations is realized by a wire, and provides a stable communication environment as compared with the wireless network between the mobile station and the base station. The base station communication unit 145 includes a base station receiving unit 149 that receives a radio signal from the mobile station 111 via the base station antenna 143, and a base station that transmits a radio signal to the mobile station 111 via the base station antenna 143. A transmission unit 151. The inter-base station transmission / reception unit 146 transmits / receives data to / from another base station connected to the own station via the network. Data is, for example, information regarding parameter values used when each base station transmits a radio signal. The base station control unit 147 controls and manages the entire base station 141 including each functional block of the base station 141. The base station control unit 147 is configured as software executed on an arbitrary suitable processor such as a CPU (Central Processing Unit), or by a dedicated processor (for example, DSP (Digital Signal Processor)) specialized for each process. It can also be configured.
　本発明の一実施形態に係る基地局制御部１４７は、パラメータ値取得部１５３と、パラメータ値設定部１５５とを備えるものとする。パラメータ値取得部１５３は、基地局受信部１４９又は基地局間送受信部１４６が受信したパラメータ値に関する情報から、自局に関係するパラメータ値を取得し、取得した情報をパラメータ値設定部１５５に送る。また、パラメータ値取得部１５３は、自局に関係しないパラメータ値に関する情報を基地局間送受信部１４６に送る。受信情報が自局に関係するか否かの判断は、情報に含まれるＩＤ情報により行われる。パラメータ値取得部１５３によって、受信情報に複数の基地局に関する情報が含まれている場合も、自局に関係する情報のみを抽出することができる。パラメータ値設定部１５５は、パラメータ値取得部１５３から送られてきた自局に関係するパラメータ値を設定する。これにより、パラメータ値の変更が行われることになる。 The base station control unit 147 according to an embodiment of the present invention includes a parameter value acquisition unit 153 and a parameter value setting unit 155. The parameter value acquisition unit 153 acquires a parameter value related to the own station from information regarding the parameter value received by the base station reception unit 149 or the inter-base station transmission / reception unit 146, and sends the acquired information to the parameter value setting unit 155. . In addition, the parameter value acquisition unit 153 sends information regarding parameter values not related to the own station to the inter-base station transmission / reception unit 146. Whether the received information is related to the own station is determined based on the ID information included in the information. The parameter value acquisition unit 153 can extract only information related to the own station even when the received information includes information on a plurality of base stations. The parameter value setting unit 155 sets the parameter value related to the own station transmitted from the parameter value acquisition unit 153. As a result, the parameter value is changed.
　続いて、無線通信システム１０１におけるパラメータ値設定方法について、図２、図３、図４及び図５を参照して説明する。図２は、本発明の一実施形態に係る移動局と基地局との位置関係を示す図である。図３は、本発明の一実施形態に係る移動局の処理を示すフローチャートである。図４は、本発明の一実施形態に係る基地局の処理を示すフローチャートである。図５は、本発明の一実施形態に係る基地局のパラメータ値が設定されるまでのシーケンス図である。 Subsequently, a parameter value setting method in the wireless communication system 101 will be described with reference to FIGS. 2, 3, 4, and 5. FIG. 2 is a diagram illustrating a positional relationship between a mobile station and a base station according to an embodiment of the present invention. FIG. 3 is a flowchart showing processing of the mobile station according to the embodiment of the present invention. FIG. 4 is a flowchart showing processing of the base station according to the embodiment of the present invention. FIG. 5 is a sequence diagram until the parameter values of the base station according to the embodiment of the present invention are set.
　以下、図２のように、移動局１１１と３つの基地局１４１ａ、１４１ｂ、１４１ｃとが位置している状況における３つの基地局のパラメータ値設定について説明する。なお、図１の基地局１４１に示した各機能ブロックに関する参照符号として、基地局１４１ａに関する機能ブロックの参照符号にはａを、基地局１４１ｂに関する機能ブロックの参照符号にはｂを、基地局１４１ｃに関する機能ブロックの参照符号にはｃを付して説明する。なお、本実施形態では、パラメータ値は、基地局１４１ａ～ｃの送信電力の値であるとする。 Hereinafter, the parameter value setting of the three base stations in a situation where the mobile station 111 and the three base stations 141a, 141b, and 141c are located as shown in FIG. 2 will be described. In addition, as a reference code regarding each functional block shown in the base station 141 of FIG. 1, “a” is used as a reference code of the functional block related to the base station 141a, “b” is used as a reference code of the functional block related to the base station 141b, and The reference numerals of the functional blocks related to the above will be described with c added. In the present embodiment, it is assumed that the parameter value is a value of transmission power of the base stations 141a to 141c.
　図２において、領域１６１ａは、基地局１４１ａの電波が届く範囲（セル）を示している。領域１６１ｂは、基地局１４１ｂの電波が届く範囲を示している。領域１６１ｃは、基地局１４１ｃの電波が届く範囲を示している。セルの境界（セルエッジ）の近傍では、複数のセルが重なり合っている。この重なり合っている領域を以下、セルエッジ近傍領域とする。例えば、セルエッジ近傍領域Ａにおいて、移動局１１１は、複数の基地局１４１ａ～ｃから無線信号（電波）を受信できる。なお、領域１６１ａ～ｃは、移動局１１１から基地局１４１ａ～ｃへ電波が届くことを保証するものではない。移動局１１１は基地局１４１ａ～ｃよりも送信出力が小さいため、基地局１４１ａ～ｃからの無線信号を受信できても、基地局１４１ａ～ｃに無線信号を送信できない場合がある。特に、セルエッジ近傍領域では、移動局１１１は、基地局１４１ａ～ｃに無線信号を送信できない可能性が高い。 2, an area 161a indicates a range (cell) within which the radio wave of the base station 141a can reach. An area 161b indicates a range in which radio waves of the base station 141b can reach. An area 161c indicates a range where radio waves of the base station 141c can reach. In the vicinity of the cell boundary (cell edge), a plurality of cells overlap. Hereinafter, the overlapping area is referred to as a cell edge vicinity area. For example, in the cell edge vicinity region A, the mobile station 111 can receive radio signals (radio waves) from the plurality of base stations 141a to 141c. The areas 161a to 161c do not guarantee that radio waves reach from the mobile station 111 to the base stations 141a to 141c. Since the mobile station 111 has a smaller transmission output than the base stations 141a to 141c, there are cases where even if the mobile station 111 can receive the radio signals from the base stations 141a to 141c, it cannot transmit the radio signals to the base stations 141a to 141c. In particular, in the area near the cell edge, there is a high possibility that the mobile station 111 cannot transmit a radio signal to the base stations 141a to 141c.
　まず、図３のフローチャートを用いて移動局１１１の処理について説明する。保守対象基地局設定部１２３は、パラメータ値（送信電力の値）を変更すべき基地局（保守対象基地局）を設定する（ステップＳ１０１及び図５の１）。以下、保守対象基地局設定部１２３は、パラメータ値の変更が必要な基地局として基地局１４１ａ～ｃを設定したとする。なお、本発明は、保守対象基地局を予め設定することに限定されず、基地局１４１ａ～ｃからの無線信号の受信品質に応じて、保守対象基地局設定部１２３は保守対象基地局を設定及び変更することができる。 First, the processing of the mobile station 111 will be described using the flowchart of FIG. The maintenance target base station setting unit 123 sets a base station (maintenance target base station) whose parameter value (transmission power value) should be changed (step S101 and 1 in FIG. 5). Hereinafter, it is assumed that the maintenance target base station setting unit 123 sets the base stations 141a to 141c as base stations that need to change parameter values. Note that the present invention is not limited to setting the maintenance target base station in advance, and the maintenance target base station setting unit 123 sets the maintenance target base station according to the reception quality of the radio signal from the base stations 141a to 141c. And can be changed.
　移動局１１１は、基地局１４１ａ～ｃ全ての基地局送信部１５１から送られてくる無線信号を受信できる領域（セルエッジ近傍領域Ａ）に移動し、基地局１４１ａ～ｃから無線信号を受信できているか否かを判断する（ステップＳ１０２及び図５の２）。基地局１４１ａ～ｃ全ての基地局から無線信号を受信できているか否かは、ＩＤ取得部１２７が無線信号に含まれる基地局１４１ａ～ｃのＩＤ情報から判断する。移動局１１１の移動局受信部１１９が、保守対象基地局の基地局送信部１５１から送られてくる無線信号を受信できると（ステップＳ１０２のＹｅｓ）、受信品質取得部１２９は、移動局受信部１１９により受信された無線信号の受信品質を取得する（ステップＳ１０３及び図５の３）。受信品質とは、例えば受信地点における電波強度や、データの誤り率などである。なお、本発明では、受信品質は、一回の受信に関する無線信号の品質に限定されるものではない。受信品質取得部１２９は、複数回に亘って受信された無線信号の品質の平均値を受信品質として特定することもできる。例えば、１０分間に３秒毎に取得した無線信号の品質の平均値を受信品質として特定することができる。 The mobile station 111 moves to an area (cell edge vicinity area A) where radio signals transmitted from the base station transmitters 151 of all the base stations 141a to 141c can be received, and can receive radio signals from the base stations 141a to 141c. It is determined whether or not (step S102 and 2 in FIG. 5). Whether or not the radio signals can be received from all the base stations 141a to 141c is determined by the ID acquisition unit 127 from the ID information of the base stations 141a to 141c included in the radio signals. When the mobile station reception unit 119 of the mobile station 111 can receive the radio signal transmitted from the base station transmission unit 151 of the maintenance target base station (Yes in step S102), the reception quality acquisition unit 129 The reception quality of the radio signal received by 119 is acquired (step S103 and 3 in FIG. 5). The reception quality is, for example, the radio wave intensity at the reception point or the data error rate. In the present invention, the reception quality is not limited to the quality of a radio signal related to one reception. Reception quality acquisition section 129 can also specify the average value of the quality of radio signals received over a plurality of times as the reception quality. For example, the average value of the quality of the radio signal acquired every 3 seconds for 10 minutes can be specified as the reception quality.
　続いて、受信品質取得部１２９が取得した受信品質から、アクセス対象基地局設定部１２５は、受信品質が所要品質を満たす無線信号を送信した基地局を特定する（ステップＳ１０４及び図５の４）。所要品質とは、移動局１１１が基地局１４１ａ～ｃと通信を行う上で必要とされる受信環境のことであり、例えば、受信電力や、データの誤り率などに関する閾値によって規定される。アクセス対象基地局設定部１２５は、受信品質が所要品質を満たす無線信号を送信した基地局をアクセス対象基地局として設定する。移動局１１１は複数の基地局１４１ａ～ｃから無線信号を受信できる領域、つまりセルエッジ近傍領域Ａに位置しているので、移動局１１１の送信電力や無線信号の干渉具合によっては、移動局１１１は基地局１４１ａ～ｃに情報を送信できない恐れがある。そこで、基地局からの無線信号の受信品質が良ければ、移動局が基地局に無線信号を送信できる可能性が高いと判断し、受信品質が所要品質を満たす無線信号を送信した基地局をアクセス対象基地局として設定する。移動局１１１は、アクセス対象に選ばれた基地局にパラメータ値に関する情報を送ることになる。なお、受信品質は、時々刻々と変動するものであるため、アクセス対象基地局設定部１２５は、無線信号の受信品質の変動する毎に、受信品質が所要品質を満たすか否かを判断し、アクセス対象を変更することができる。以下、説明の便宜上、受信品質が所要品質を満たす無線信号を送信した基地局は、基地局１４１ａのみであったとする。 Subsequently, from the reception quality acquired by the reception quality acquisition unit 129, the access target base station setting unit 125 specifies the base station that has transmitted the radio signal whose reception quality satisfies the required quality (step S104 and 4 in FIG. 5). . The required quality is a reception environment required for the mobile station 111 to communicate with the base stations 141a to 141c, and is defined by, for example, threshold values relating to reception power, data error rate, and the like. The access target base station setting unit 125 sets, as an access target base station, a base station that has transmitted a radio signal whose reception quality satisfies the required quality. Since the mobile station 111 is located in an area where the radio signals can be received from the plurality of base stations 141a to 141c, that is, in the cell edge vicinity area A, depending on the transmission power of the mobile station 111 and the radio signal interference, the mobile station 111 may There is a possibility that information cannot be transmitted to the base stations 141a to 141c. Therefore, if the reception quality of the radio signal from the base station is good, it is determined that the mobile station is likely to be able to transmit the radio signal to the base station, and the base station that transmitted the radio signal that satisfies the required quality is accessed. Set as the target base station. The mobile station 111 sends information on the parameter value to the base station selected for access. Note that, since the reception quality varies from moment to moment, the access target base station setting unit 125 determines whether the reception quality satisfies the required quality every time the reception quality of the radio signal varies, The access target can be changed. Hereinafter, for convenience of explanation, it is assumed that the base station 141a is the only base station that transmits a radio signal whose reception quality satisfies the required quality.
　次に、算出部１３１が、受信品質取得部１２９により取得された受信品質に基づいて基地局１４１ａ～ｃのパラメータ値を算出する（ステップＳ１０５及び図５の５）。例えば、算出部１３１は、移動局１１１と基地局１４１ａ～ｃとの距離を考慮して、受信地点における電波強度がある所望の値より小さい場合には、基地局の送信電力が大きくなるようなパラメータ値を指定することができる。又は算出部１３１は、受信地点における電波強度がある所望の値より大きい場合には、基地局の送信電力が小さくなるようなパラメータ値を指定することができる。また、算出部１３１は、受信品質や複数の基地局からの無線信号の干渉の程度などから最適な送信電力値を決定することもできる。 Next, the calculation unit 131 calculates the parameter values of the base stations 141a to 141c based on the reception quality acquired by the reception quality acquisition unit 129 (step S105 and 5 in FIG. 5). For example, the calculation unit 131 considers the distance between the mobile station 111 and the base stations 141a to 141c, and the transmission power of the base station increases when the radio field intensity at the reception point is smaller than a desired value. Parameter values can be specified. Alternatively, the calculation unit 131 can designate a parameter value that reduces the transmission power of the base station when the radio wave intensity at the reception point is greater than a desired value. The calculation unit 131 can also determine an optimal transmission power value from the reception quality, the degree of radio signal interference from a plurality of base stations, and the like.
　そして、算出部１３１は、算出したパラメータ値を、基地局１４１ａ～ｃのＩＤ情報と関連付けて、移動局通信部１１５に送る。移動局送信部１２１は、移動局アンテナ１１３を介して、アクセス対象基地局１４１ａに保守対象基地局１４１ａ～ｃ全てのパラメータ値及び関連するＩＤ情報を含む無線信号を送信する（ステップＳ１０６及び図５の６）。 Then, the calculation unit 131 sends the calculated parameter value to the mobile station communication unit 115 in association with the ID information of the base stations 141a to 141c. The mobile station transmission unit 121 transmits a radio signal including the parameter values of all the maintenance target base stations 141a to 141c and related ID information to the access target base station 141a via the mobile station antenna 113 (step S106 and FIG. 5). 6).
　続いて、図４のフローチャートを用いて基地局１４１ａ～ｃの処理について説明する。基地局１４１ａの基地局受信部１４９ａは、基地局アンテナ１４３ａを介して、移動局１１１からパラメータ値及び関連するＩＤ情報を含む無線信号を受信する（ステップＳ１１１）。そして、基地局制御部１４７ａのパラメータ値取得部１５３ａは、基地局１４１ａ～ｃのＩＤ情報を基に、受信した情報から自局に関係するパラメータ値のみを取得する（ステップＳ１１２）。その後、パラメータ値取得部１５３ａは、取得したパラメータ値をパラメータ値設定部１５５ａに送り、自局に関係しないパラメータ値及び関連するＩＤ情報を基地局間送受信部１４６ａに送る。 Subsequently, processing of the base stations 141a to 141c will be described using the flowchart of FIG. The base station receiver 149a of the base station 141a receives a radio signal including a parameter value and related ID information from the mobile station 111 via the base station antenna 143a (step S111). Then, the parameter value acquisition unit 153a of the base station control unit 147a acquires only the parameter value related to the own station from the received information based on the ID information of the base stations 141a to 141c (step S112). Thereafter, the parameter value acquisition unit 153a sends the acquired parameter value to the parameter value setting unit 155a, and sends the parameter value not related to the own station and the related ID information to the inter-base station transmission / reception unit 146a.
　パラメータ値設定部１５５ａは、パラメータ値取得部１５３ａが取得したパラメータ値を自局の対応するパラメータに設定する（ステップＳ１１３及び図５の７）。本実施形態では、送信電力の値がパラメータ値として移動局１１１から送信されるので、ステップＳ１１３により、基地局１４１ａが移動局１１１に送る無線信号の送信電力の値が変更されることになる。 The parameter value setting unit 155a sets the parameter value acquired by the parameter value acquisition unit 153a to the corresponding parameter of the own station (Step S113 and 7 in FIG. 5). In this embodiment, since the value of the transmission power is transmitted from the mobile station 111 as a parameter value, the value of the transmission power of the radio signal transmitted from the base station 141a to the mobile station 111 is changed in step S113.
　基地局１４１ａが受信した情報のうち自局に関係しないパラメータ値に関する情報については、基地局間送受信部１４６ａが、当該情報全てを、Ｘ２インタフェースにより他の基地局１４１ｂの基地局間送受信部１４６ｂに送信する（ステップＳ１１４及び図５の８）。なお、基地局１４１ａが自局に関係しないパラメータ値に関する情報を送信する送信先は、基地局１４１ｂに限定されず、基地局１４１ｃに送信することもできる。また、基地局１４１ａは、自局に関係しないパラメータ値に関する情報全てを基地局１４１ｂ又は１４１ｃに送信せずに、ＩＤ情報を基に、基地局１４１ｂに関する情報のみ基地局１４１ｂに、基地局１４１ｃに関する情報のみ基地局１４１ｃに送信することもできる。 Of the information received by the base station 141a, the inter-base station transceiver unit 146a transmits all the information to the inter-base station transceiver unit 146b of the other base station 141b via the X2 interface. Transmit (step S114 and 8 in FIG. 5). Note that the transmission destination to which the base station 141a transmits information related to parameter values not related to the own station is not limited to the base station 141b, and can be transmitted to the base station 141c. In addition, the base station 141a does not transmit all the information related to the parameter values not related to the own station to the base station 141b or 141c, but only the information related to the base station 141b is transmitted to the base station 141b based on the ID information. Only information can be transmitted to the base station 141c.
　基地局１４１ｂの基地局間送受信部１４６ｂが、基地局１４１ａからパラメータ値に関する情報を受信すると（ステップＳ１１１）、基地局１４１ｂは、基地局１４１ａでの処理と同様、自局に関係するパラメータ値に関する情報のみ取得及び設定する（ステップＳ１１２、Ｓ１１３及び図５の９）。また基地局１４１ｂは、自局に関係しないパラメータ値に関する情報は、他の基地局１４１ｃに送信する（ステップＳ１１４図５の１０）。基地局１４１ｂと同様にして基地局１４１ｃがパラメータ値を設定することにより（図５の１１）、全ての基地局１４１ａ～ｃのパラメータ値の設定が完了することになる。 When the inter-base station transmission / reception unit 146b of the base station 141b receives information on the parameter value from the base station 141a (step S111), the base station 141b relates to the parameter value related to its own station, as in the processing in the base station 141a. Only information is acquired and set (steps S112 and S113 and 9 in FIG. 5). Further, the base station 141b transmits information on parameter values not related to the own station to the other base station 141c (step S114, 10 in FIG. 5). When the base station 141c sets the parameter values in the same manner as the base station 141b (11 in FIG. 5), the setting of the parameter values of all the base stations 141a to 141c is completed.
　パラメータ値の設定完了後に、移動局１１１の受信品質取得部１２９が取得した電波強度が所望の値ではない、又は所望の範囲に収まっていない場合には、上記ステップＳ１０１～Ｓ１０６及びＳ１１１～Ｓ１１４が繰り返されことになる。 When the radio field intensity acquired by the reception quality acquisition unit 129 of the mobile station 111 is not a desired value or not within a desired range after the parameter value setting is completed, the above steps S101 to S106 and S111 to S114 are performed. Will be repeated.
　このように本実施形態では、移動局受信部１１９が複数の基地局１４１ａ～ｃからの無線信号を受信すると、算出部１３１は、当該無線信号の受信品質から各基地局のパラメータ値を算出し、受信品質が所要品質を満たす無線信号を送信した基地局１４１aへ、基地局１４１ａ～ｃ全てのパラメータ値に関する情報を含む無線信号を送信する。基地局１４１ａの基地局受信部が無線信号を受信すると、基地局制御部１４７は、自局に関係するパラメータ値を設定し、且つ基地局間送受信部１４６に、自局に関係しないパラメータ値に関する情報を他の基地局１４１ｂへ送信させる。つまり、セルエッジ近傍領域に位置する移動局１１１が、パラメータ値を変更すべき３基の基地局１４１ａ～ｃから無線信号を受信し、１基の基地局１４１ａにパラメータ値に関する情報を含む無線信号を送信する。移動局１１１からパラメータ値に関する情報が送信されてこない基地局１４１ｂ及びｃは、Ｘ２インタフェースによる基地局間接続により基地局１４１ａ又はｂからパラメータ値を取得し、変更できる。よって、移動局１１１が少なくとも１基と双方向通信が可能であれば、複数の基地局のパラメータ値を変更することが可能である。移動局と基地局との間の無線ネットワークよりも安定しているＸ２インタフェースによる基地局間ネットワークを利用することにより、移動局１１１は、セルエッジ近傍領域において１基ずつパラメータ値を無線信号で送信するよりも効率的に変更すべきパラメータ値を基地局１４１ａ～ｃに届けることができる。 As described above, in this embodiment, when the mobile station reception unit 119 receives radio signals from the plurality of base stations 141a to 141c, the calculation unit 131 calculates the parameter value of each base station from the reception quality of the radio signals. Then, a radio signal including information on parameter values of all the base stations 141a to 141c is transmitted to the base station 141a that has transmitted the radio signal whose reception quality satisfies the required quality. When the base station receiving unit of the base station 141a receives a radio signal, the base station control unit 147 sets a parameter value related to the own station, and the inter-base station transmitting / receiving unit 146 relates to a parameter value not related to the own station. Information is transmitted to another base station 141b. That is, the mobile station 111 located in the cell edge vicinity region receives radio signals from the three base stations 141a to 141c whose parameter values are to be changed, and receives radio signals including information on the parameter values in one base station 141a. Send. Base stations 141b and 141c that do not receive information on parameter values from the mobile station 111 can acquire and change parameter values from the base station 141a or b by inter-base station connection through the X2 interface. Therefore, if the mobile station 111 can perform bidirectional communication with at least one mobile station 111, it is possible to change parameter values of a plurality of base stations. By using the inter-base station network with the X2 interface that is more stable than the radio network between the mobile station and the base station, the mobile station 111 transmits the parameter values one by one in the vicinity of the cell edge as a radio signal. The parameter values to be changed more efficiently can be delivered to the base stations 141a to 141c.
　本発明を諸図面や実施例に基づき説明してきたが、当業者であれば本開示に基づき種々の変形や修正を行うことが容易であることに注意されたい。従って、これらの変形や修正は本発明の範囲に含まれることに留意されたい。 Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.
　例えば、各部材、各手段、各ステップなどに含まれる機能などは論理的に矛盾しないように再配置可能であり、複数の手段やステップなどを１つに組み合わせたり、或いは分割したりすることが可能である。 For example, functions included in each member, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined or divided into one. Is possible.
　１０１　無線通信システム
　１１１　移動局
　１１３　移動局アンテナ
　１１５　移動局通信部
　１１７　移動局制御部
　１１９　移動局受信部
　１２１　移動局送信部
　１２３　保守対象基地局設定部
　１２５　アクセス対象基地局設定部
　１２７　ＩＤ取得部
　１２９　受信品質取得部
　１３１　算出部
　１４１、１４１ａ、１４１ｂ、１４１ｃ　基地局
　１４３　基地局アンテナ
　１４５　基地局通信部
　１４６　基地局間送受信部
　１４７　基地局制御部
　１４９　基地局受信部
　１５１　基地局送信部
　１５３　パラメータ値取得部
　１５５　パラメータ値設定部
　１６１ａ、１６１ｂ、１６１ｃ　領域
　Ａ　セルエッジ近傍領域 DESCRIPTION OF SYMBOLS 101 Wireless communication system 111 Mobile station 113 Mobile station antenna 115 Mobile station communication part 117 Mobile station control part 119 Mobile station reception part 121 Mobile station transmission part 123 Maintenance target base station setting part 125 Access target base station setting part 127 ID acquisition part 129 Reception quality acquisition unit 131 Calculation unit 141, 141a, 141b, 141c Base station 143 Base station antenna 145 Base station communication unit 146 Inter-base station transmission / reception unit 147 Base station control unit 149 Base station reception unit 151 Base station transmission unit 153 Parameter value acquisition Part 155 Parameter value setting part 161a, 161b, 161c area A Cell edge vicinity area

Claims (4)

  1. 　無線信号を送信する際に利用するパラメータ値に関する情報を取得して、当該パラメータ値を設定する基地局と無線通信する移動局であって、
    　無線信号を受信する移動局受信部と、
    　前記移動局受信部により受信された無線信号の受信品質を取得する受信品質取得部と、
    　前記基地局が無線信号を送信する際に利用するパラメータ値を算出する算出部と、
    　前記算出部により算出された前記パラメータ値に関する情報を含む無線信号を送信する移動局送信部と、
    を備え、
    　前記移動局受信部が複数の基地局からの無線信号を受信すると、
    　　前記算出部は、前記複数の基地局からの前記無線信号の受信品質に基づいて各基地局のパラメータ値を算出し、
    　　前記移動局送信部は、前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信する
    ことを特徴とする移動局。     A mobile station that obtains information about a parameter value to be used when transmitting a radio signal and wirelessly communicates with a base station that sets the parameter value,
    A mobile station receiver for receiving radio signals;
    A reception quality acquisition unit for acquiring the reception quality of the radio signal received by the mobile station reception unit;
    A calculation unit for calculating a parameter value used when the base station transmits a radio signal;
    A mobile station transmitter that transmits a radio signal including information on the parameter value calculated by the calculator;
    With
    When the mobile station receiver receives radio signals from a plurality of base stations,
    The calculation unit calculates a parameter value of each base station based on reception quality of the radio signal from the plurality of base stations,
    The mobile station transmission unit transmits a radio signal including information on the parameter values of all the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations. A mobile station characterized by that.
  2. 　ネットワークを介して互いに接続されている複数の基地局と、前記複数の基地局と接続して無線通信を行う移動局と、から構成される無線通信システムであって、
    　前記複数の基地局の各基地局は、
    　　無線信号を受信する基地局受信部と、
    　　無線信号を送信する基地局送信部と、
    　　前記ネットワークを介して自局と接続されている他の基地局とデータを送受信する基地局間送受信部と、
    　　前記基地局受信部が、前記移動局から無線信号を送信する際に利用するパラメータ値に関する情報を含む無線信号を受信すると、自局に関係するパラメータ値を設定し、且つ、前記基地局間送受信部に、自局に関係しないパラメータ値に関する情報を他の基地局へ送信させる基地局制御部と、を備え、
    　前記移動局は、
    　　前記基地局送信部から送信された無線信号を受信する移動局受信部と、
    　　前記移動局受信部により受信された無線信号の受信品質を取得する受信品質取得部と、
    　　基地局が無線信号を送信する際に利用するパラメータ値を算出する算出部と、
    　　前記算出部により算出された前記パラメータ値に関する情報を含む無線信号を送信する移動局送信部と、を備え、
    　前記複数の基地局からの無線信号が前記移動局受信部により受信されると、
    　　前記算出部は、前記複数の基地局の前記無線信号の受信品質に基づいて各基地局のパラメータ値を算出し、
    　　前記移動局送信部は、前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信する
    ことを特徴とする無線通信システム。     A wireless communication system comprising a plurality of base stations connected to each other via a network, and a mobile station that connects to the plurality of base stations and performs wireless communication,
    Each base station of the plurality of base stations is
    A base station receiver for receiving radio signals;
    A base station transmitter for transmitting radio signals;
    An inter-base station transmission / reception unit that transmits / receives data to / from another base station connected to the local station via the network;
    When the base station receiving unit receives a radio signal including information on a parameter value used when transmitting a radio signal from the mobile station, the base station receiving unit sets a parameter value related to the own station and transmits / receives between the base stations A base station controller that transmits information on parameter values not related to the own station to other base stations,
    The mobile station
    A mobile station receiver that receives a radio signal transmitted from the base station transmitter;
    A reception quality acquisition unit for acquiring the reception quality of the radio signal received by the mobile station reception unit;
    A calculation unit that calculates a parameter value used when the base station transmits a radio signal;
    A mobile station transmitter that transmits a radio signal including information on the parameter value calculated by the calculator,
    When radio signals from the plurality of base stations are received by the mobile station receiver,
    The calculation unit calculates a parameter value of each base station based on reception quality of the radio signals of the plurality of base stations,
    The mobile station transmission unit transmits a radio signal including information on the parameter values of all the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations. A wireless communication system.
  3. 　無線信号を送信する際に利用するパラメータ値に関する情報を取得して、当該パラメータ値を設定する基地局と無線通信する移動局のパラメータ値送信方法において、
    　複数の基地局からの無線信号を受信するステップと、
    　前記無線信号の受信品質を取得するステップと、
    　前記受信品質に基づいて各基地局が無線信号を送信する際に利用するパラメータ値を算出するステップと、
    　前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、
    前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信するステップと、
    を含む移動局のパラメータ値送信方法。     In a parameter value transmission method of a mobile station that obtains information about a parameter value used when transmitting a radio signal and wirelessly communicates with a base station that sets the parameter value,
    Receiving radio signals from a plurality of base stations;
    Obtaining reception quality of the radio signal;
    Calculating a parameter value to be used when each base station transmits a radio signal based on the reception quality;
    Among the plurality of base stations, to the base station that has transmitted a radio signal whose reception quality satisfies the required quality,
    Transmitting a radio signal including information on the parameter values of all of the plurality of base stations;
    A parameter value transmission method for a mobile station including
  4. 　ネットワークを介して互いに接続されている複数の基地局と、前記複数の基地局と接続して無線通信を行う移動局と、から構成される無線通信システムにおける基地局のパラメータ値設定方法において、
    　前記移動局が、
    　　前記複数の基地局からの無線信号を受信するステップと、
    　　前記無線信号の受信品質を取得するステップと、
    　　前記受信品質に基づいて各基地局が無線信号を送信する際に利用するパラメータ値を算出するステップと、
    　　前記複数の基地局のうち、受信品質が所要品質を満たす無線信号を送信した基地局へ、前記複数の基地局全ての前記パラメータ値に関する情報を含む無線信号を送信するステップと、
    　前記基地局が、
    　　前記パラメータ値に関する情報を含む無線信号を受信するステップと、
    　　前記パラメータ値のうち自局に関係するパラメータ値を設定するステップと、
    　　前記パラメータ値のうち自局に関係しないパラメータ値に関する情報を他の基地局へ送信するステップと
    を含む無線通信システムにおける基地局のパラメータ値設定方法。     In the parameter value setting method of a base station in a wireless communication system composed of a plurality of base stations connected to each other via a network and a mobile station connected to the plurality of base stations and performing wireless communication,
    The mobile station is
    Receiving radio signals from the plurality of base stations;
    Obtaining reception quality of the radio signal;
    Calculating a parameter value to be used when each base station transmits a radio signal based on the reception quality;
    Transmitting a radio signal including information on the parameter values of all of the plurality of base stations to a base station that has transmitted a radio signal satisfying a required quality among the plurality of base stations;
    The base station is
    Receiving a radio signal including information on the parameter value;
    Setting a parameter value related to the own station among the parameter values;
    A parameter value setting method for a base station in a wireless communication system, including a step of transmitting, to the other base station, information relating to a parameter value not related to the own station among the parameter values.
PCT/JP2011/002925 2010-05-26 2011-05-25 Mobile station, wireless communication system, mobile station parameter transmission method and base station parameter setting method in wireless communication system WO2011148637A1 (en)

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