WO2009128303A1 - Wireless communication system, terminal, base station and wireless communication method - Google Patents

Wireless communication system, terminal, base station and wireless communication method Download PDF

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Publication number
WO2009128303A1
WO2009128303A1 PCT/JP2009/054321 JP2009054321W WO2009128303A1 WO 2009128303 A1 WO2009128303 A1 WO 2009128303A1 JP 2009054321 W JP2009054321 W JP 2009054321W WO 2009128303 A1 WO2009128303 A1 WO 2009128303A1
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base station
frequency
terminal
station
allocated
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PCT/JP2009/054321
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French (fr)
Japanese (ja)
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裕章 宮元
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日本電気株式会社
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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
    • H04L5/0042—Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to a wireless communication system, a terminal, a base station, and a wireless communication method.
  • OFDMA Orthogonal Frequency Multiple Access
  • the OFDMA scheme is a scheme in which when transmitting data on the uplink or downlink, a frequency within a certain frequency band and a time in which the frequency can be used are allocated to a data transmission source.
  • WiMAX Adopted by Worldwide Interoperability for Microwave Access.
  • a terminal in the case of uplink, a terminal (Mobile Station) makes a bandwidth request to a base station (Base Station) when transmitting uplink data. Then, the base station assigns a frequency within the frequency band assigned to the own station and a time zone in which the frequency can be used to the terminal. And a terminal transmits uplink data using the frequency allocated in the time slot allocated from the base station (for example, refer patent document 1).
  • a plurality of frequency bands such as 5 MHz / 7 MHz / 10 MHz / 20 MHz can be used.
  • each base station has one frequency band. Assigned.
  • the frequency allocated to the terminal is only a frequency within one frequency band allocated to the base station that has requested the band among a plurality of frequency bands that can be used in WiMAX.
  • the frequency allocated to a base station is only the frequency within one frequency band allocated to the base station.
  • the usable frequency band cannot be used effectively in both the uplink and the downlink.
  • an object of the present invention is to provide a wireless communication system, a terminal, a base station, and a wireless communication method that solve the above-described problems.
  • the first wireless communication system of the present invention includes: A wireless communication system for performing wireless communication between a terminal and a base station, A first base station and a second base station adjacent to each other; The first base station and the second base station are assigned different frequency bands, and uplink bands from terminals located at cell boundaries of the first base station and the second base station.
  • the terminal uses a frequency allocated from each of the first base station and the second base station, to the communicating base station among the first base station and the second base station.
  • uplink data is transmitted.
  • the second wireless communication system of the present invention is A wireless communication system for performing wireless communication between a terminal and a base station, A first base station and a second base station adjacent to each other; The first base station and the second base station are assigned different frequency bands, The first base station makes a downlink bandwidth request to the second base station via a terminal located at a cell boundary with the second base station, When the second base station receives a downlink bandwidth request from the first base station, the second base station assigns a frequency within the frequency band of the local station, The first base station transmits downlink data to the terminal using a frequency within its own frequency band and a frequency assigned by the second base station.
  • the terminal of the present invention When the own terminal is located at a cell boundary between a base station in communication and an adjacent base station to which a frequency band different from the base station is allocated, an uplink band is transmitted to the base station in communication and the adjacent base station.
  • a data transmission unit configured to transmit uplink data to the communicating base station using the frequency allocated from the communicating base station and the frequency allocated from the adjacent base station.
  • the first base station of the present invention In response to a bandwidth request from a terminal that is communicating with or not communicating with its own station, a bandwidth allocating unit that assigns a frequency within the frequency band of the own station is provided.
  • the second base station of the present invention When a terminal in communication with the local station is located at a cell boundary between the local station and an adjacent base station to which a different frequency band is allocated, the downlink to the adjacent base station via the terminal in communication A bandwidth request unit for requesting a bandwidth of the link; In response to a bandwidth request from a neighboring base station via a terminal, a bandwidth allocation unit that allocates a frequency within the frequency band of the local station; A data transmission unit configured to transmit downlink data to a terminal in communication using a frequency within the frequency band of the own station and a frequency allocated by an adjacent base station.
  • the first wireless communication method of the present invention includes: A wireless communication method using a terminal, When the own terminal is located at a cell boundary between a base station in communication and an adjacent base station to which a frequency band different from the base station is allocated, an uplink band is transmitted to the base station in communication and the adjacent base station.
  • a bandwidth request step for making a request A data transmission step of transmitting uplink data to the communicating base station using the frequency allocated from the communicating base station and the frequency allocated from the adjacent base station.
  • the second wireless communication method of the present invention includes: A wireless communication method by a base station, In response to a bandwidth request from a terminal communicating with the own station and a terminal not communicating with the own station, a bandwidth allocation step of allocating a frequency within the frequency band of the own station is provided.
  • the third wireless communication method of the present invention is: A wireless communication method by a base station, When a terminal in communication with the local station is located at a cell boundary between the local station and an adjacent base station to which a different frequency band is allocated, the downlink to the adjacent base station via the terminal in communication A bandwidth request step for requesting a bandwidth of the link; A data transmission step of transmitting downlink data to a terminal in communication using a frequency within the frequency band of the own station and a frequency allocated by an adjacent base station.
  • the fourth wireless communication method of the present invention is: A wireless communication method by a base station, In response to a bandwidth request from a neighboring base station via a terminal, a bandwidth allocation step of allocating a frequency within the frequency band of the local station is provided.
  • the first base station and the second base station are assigned frequency bands that are adjacent to each other and different from each other, and are uplinked from a terminal located at a cell boundary.
  • a bandwidth request is received, a frequency within the frequency band of the local station is allocated, and the terminal transmits uplink data using the frequency allocated from each of the first base station and the second base station.
  • the first base station and the second base station are assigned to different frequency bands adjacent to each other, and the second base station When a downlink bandwidth request is received from the base station, a frequency within the frequency band of the local station is allocated, and the first base station allocates a frequency within the frequency band of the local station and a frequency allocated from the second base station. Are used to transmit downlink data.
  • the frequency within the frequency band of the first base station can be allocated to the first base station, but also the frequency can be allocated from the second base station.
  • the effect that the frequency band which can be used in a communication system can be utilized more effectively is acquired.
  • FIG. 3 It is a block diagram which shows the structure of the radio
  • a plurality of frequency bands such as 5 MHz / 7 MHz / 10 MHz / 20 MHz can be used, and any one frequency band is allocated to each base station, so that different frequency bands are allocated between adjacent base stations. May have been.
  • WiMAX wireless communication system will be described as an example.
  • the present invention is not limited to the WiMAX system, and may be applied to any communication system that can use a plurality of frequency bands. is there.
  • FIG. 1 is a diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.
  • the wireless communication system of the present embodiment includes a terminal MS and base stations BS1 and BS2.
  • the base station BS1 is assigned a frequency band f1 (for example, 10 MHz), and the base station BS2 is adjacent to the base station BS1 and has a frequency band f2 (different from the base station BS1). For example, it is assumed that 20 MHz) is allocated. Further, the terminal MS is assumed to be located at a cell boundary between a cell C1 in which the base station BS1 provides a radio communication service and a cell C2 in which the base station BS2 provides a radio communication service.
  • f1 for example, 10 MHz
  • f2 different from the base station BS1
  • the terminal MS is assumed to be located at a cell boundary between a cell C1 in which the base station BS1 provides a radio communication service and a cell C2 in which the base station BS2 provides a radio communication service.
  • FIG. 1 only one terminal MS and two base stations BS1 and BS2 are shown for simplicity of explanation, but actually other terminals and base stations are also provided. And
  • the terminal MS is assumed to be located at the cell boundary between the two base stations BS1 and BS2.
  • the present invention is not limited to this, and the case where the terminal MS is located at the cell boundary between three or more base stations is also applicable. Is possible.
  • FIG. 2 is a block diagram showing an internal configuration of the terminal MS and the base stations BS1 and BS2.
  • FIG. 2 only the essential components of the present invention are shown among the components of the terminal MS and the base stations BS1 and BS2, and the other components are omitted.
  • the terminal MS includes a communication unit 101, a bandwidth request unit 102, a data transmission unit 103, an expanded bandwidth notification unit 104, and a bandwidth request transfer unit 105.
  • the operation of the components of the terminal MS will be described assuming that communication is being performed with the base station BS1, but the operation when communication is being performed with the base station BS2 is also the same.
  • the communication unit 101 performs wireless communication with each of the base stations BS1 and BS2.
  • the bandwidth request unit 102 makes an uplink bandwidth request to the base station BS1 and the base station BS2.
  • the data transmission unit 103 uses the frequency in the frequency band f1 allocated from the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2. Uplink data is transmitted to the base station BS1.
  • the data transmission unit 103 transmits uplink data to the base station BS1 using only the frequency within the frequency band f1 assigned from the base station BS1.
  • the expanded band notification unit 104 When the frequency is assigned from the base station BS2, the expanded band notification unit 104 notifies the base station BS1 of the frequency and the time zone to which the frequency is assigned.
  • the bandwidth request transfer unit 105 When the bandwidth request transfer unit 105 receives a downlink bandwidth request from the base station BS1 during communication between the base station BS1 and the terminal MS, the bandwidth request transfer unit 105 transfers the bandwidth request to the base station BS2.
  • each of the base stations BS1 and BS2 includes a communication unit 201, a band allocation unit 202, a band request unit 203, and a data transmission unit 204.
  • a communication unit 201 the operation of the components of the base station BS1 will be described, but the operation of the components of the base station BS2 is the same.
  • the communication unit 201 performs wireless communication with the terminal MS.
  • the band allocation unit 202 allocates a frequency in the frequency band f1 when receiving an uplink band request from the terminal MS during communication between the base station BS1 and the terminal MS.
  • the bandwidth allocation unit 202 when the bandwidth allocation unit 202 receives an uplink bandwidth request from the terminal MS while the base station BS1 is not communicating with the terminal MS, the bandwidth allocating unit 202 assigns a frequency to any of the other terminals communicating with the base station BS1. Only when there is an unassigned time zone, the frequency in the frequency band f1 is assigned in that time zone.
  • the bandwidth allocation unit 202 receives a downlink bandwidth request from the base station BS2 via the terminal MS during the communication between the base station BS2 and the terminal MS, the time when the frequency is not allocated to the base station BS1 Only when there is a band, a frequency in the frequency band f1 is allocated in the time band.
  • the bandwidth request unit 203 makes a downlink bandwidth request to the base station BS2 via the terminal MS when downlink data to be transmitted to the terminal MS occurs during communication between the base station BS1 and the terminal MS. .
  • the data transmission unit 204 uses the frequency in the frequency band f1 allocated to the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2. Downlink data is transmitted to the terminal MS.
  • the data transmission unit 204 transmits downlink data to the terminal MS using only the frequency within the frequency band f1 allocated to the base station BS1.
  • terminal MS is communicating with base station BS1.
  • FIG. 3 is a flowchart for explaining the operation at the time of data transmission in the uplink of the wireless communication system of this embodiment.
  • the bandwidth request unit 102 of the terminal MS transmits to the base station BS1 and the base station BS2.
  • an uplink bandwidth request is made (steps 302 and 303).
  • the band allocation unit 202 of the base station BS1 allocates a frequency within the frequency band f1 and a time zone in which the frequency can be used to the terminal MS, and notifies the terminal MS of the allocated frequency and time zone. (Step 304).
  • the bandwidth allocating unit 202 of the base station BS2 determines whether there is a vacancy in the uplink bandwidth in response to the uplink bandwidth request from the terminal MS, specifically, another terminal communicating with the base station BS2. It is confirmed whether there is a time zone in which no frequency is assigned to any of them (step 305).
  • step 305 when there is no time zone in which no frequency is assigned to any of the other terminals communicating with the base station BS2, the band assignment unit 202 of the base station BS2 indicates that the assignment of the frequency to the terminal MS has failed. To the terminal MS (step 306).
  • the data transmission unit 103 of the terminal MS transmits the uplink data to the base station BS1 using only the frequency within the frequency band f1 allocated from the base station BS1 (step 307).
  • the band assignment unit 202 of the base station BS2 The frequency in the frequency band f2 is allocated, and the allocated frequency and time band are notified to the terminal MS (step 308). Thereby, in terminal MS, the frequency used for transmission of uplink data is expanded to the frequency allocated from base station BS2.
  • the expanded band notification unit 104 of the terminal MS notifies the base station BS1 of the frequency and time zone allocated from the base station BS2 (step 309).
  • Step 310 when the data transmission unit 103 of the terminal MS receives the ACK message as a response to the notification in Step 309 (Step 310), the frequency in the frequency band f1 allocated from the base station BS1 and the frequency allocated from the base station BS2 The uplink data is transmitted to the base station BS1 using the frequency in the band f2 (step 311).
  • the terminal MS when the terminal MS and the base station BS1 are communicating, the terminal MS is not only the communicating base station BS1, but is adjacent to the base station BS1 and is different from the base station BS1.
  • An uplink bandwidth request is also made to the base station BS2 to which the frequency band is allocated, and the frequency in the frequency band f1 allocated from the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2 Is used to transmit uplink data to the base station BS1.
  • FIG. 5 is a flowchart for explaining the operation at the time of data transmission in the case of the downlink of the wireless communication system of the present embodiment.
  • the bandwidth request unit 203 of the base station BS1 sends the terminal MS to the base station BS2.
  • a downlink bandwidth request is made (step 502).
  • the bandwidth request transfer unit 105 of the terminal MS transfers the downlink bandwidth request from the base station BS1 to the base station BS2 to the base station BS2 (step 503).
  • the band allocating unit 202 of the base station BS2 confirms whether there is a vacant downlink band, specifically, whether there is a time zone in which no frequency is allocated to the base station BS2 (step 504).
  • step 504 when there is no time zone in which no frequency is allocated to the base station BS2, the band allocation unit 202 of the base station BS2 notifies the terminal MS that the frequency allocation to the base station BS1 has failed (step 505). ).
  • the bandwidth request transfer unit 105 of the terminal MS transfers a notification that the frequency allocation to the base station BS1 has failed to the base station BS1 (step 506).
  • the data transmission unit 204 of the base station BS1 transmits downlink data to the terminal MS using only the frequency within the frequency band f1 allocated to the base station BS1 (step 507).
  • the band assignment unit 202 of the base station BS2 assigns a frequency in the frequency band f2 to the base station BS1 in that time zone.
  • the terminal MS is notified of the allocated frequency and time zone (step 508). Thereby, in base station BS1, the frequency used for transmission of downlink data is expanded to the frequency allocated from base station BS2.
  • the bandwidth request transfer unit 105 of the terminal MS notifies the base station BS1 of the frequency and time zone allocated from the base station BS2 to the base station BS1 (step 509).
  • the data transmission unit 204 of the base station BS1 uses the frequency in the frequency band f1 allocated to the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2 to the terminal MS to download downlink data. Is transmitted (step 510).
  • the base station BS1 when the terminal MS and the base station BS1 are communicating, the base station BS1 is adjacent to the base station BS1 and is assigned with a different frequency band from the base station BS1.
  • a downlink band request is made via the terminal MS, and the frequency in the frequency band f1 allocated to the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2 are used. Then, downlink data is transmitted to the terminal MS.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

A wireless communication system includes a first base station and a second base station which are adjacent to one another. A frequency band allocated to the first base station is different from a frequency band allocated to the second base station. When a uplink band request is received from a terminal at the border between a cell of the first base station and a cell of the second base station, the first base station allocates a frequency that is within the frequency band of the first base station while the second base station allocates a frequency that is within the frequency band of the second base station. The terminal uses the frequencies allocated by the first and second base stations to transmit uplink data to the first or second base station with which the terminal is communicating.

Description

無線通信システム、端末、基地局、無線通信方法Wireless communication system, terminal, base station, wireless communication method
　本発明は、無線通信システム、端末、基地局、無線通信方法に関する。 The present invention relates to a wireless communication system, a terminal, a base station, and a wireless communication method.
　近年、無線通信システムの多元接続方式として、ＯＦＤＭＡ（Orthogonal　Frequency　Division　Multiple　Access：直交周波数分割多元接続）方式が注目を集めている。 In recent years, the OFDMA (Orthogonal Frequency Multiple Access) method has attracted attention as a multiple access method for wireless communication systems.
　ＯＦＤＭＡ方式は、上りリンクまたは下りリンクでデータを送信する際に、データの送信元に対して、ある周波数帯域内の周波数とその周波数を使用可能な時間とを割り当てる方式であり、例えば、ＷｉＭＡＸ（Worldwide　Interoperability　for　Microwave　Access）で採用されている。 The OFDMA scheme is a scheme in which when transmitting data on the uplink or downlink, a frequency within a certain frequency band and a time in which the frequency can be used are allocated to a data transmission source. For example, WiMAX ( Adopted by Worldwide Interoperability for Microwave Access.
　ＷｉＭＡＸでは、例えば、上りリンクの場合、端末（Mobile　Station）は、上りデータを送信する際に、基地局（Base　Station）に対して帯域要求を行う。すると、基地局は、自局に割り当てられた周波数帯域内の周波数とその周波数を使用可能な時間帯とを端末に割り当てる。そして、端末は、基地局から割り当てられた時間帯に割り当てられた周波数を使用して、上りデータを送信する（例えば、特許文献１参照）。 In WiMAX, for example, in the case of uplink, a terminal (Mobile Station) makes a bandwidth request to a base station (Base Station) when transmitting uplink data. Then, the base station assigns a frequency within the frequency band assigned to the own station and a time zone in which the frequency can be used to the terminal. And a terminal transmits uplink data using the frequency allocated in the time slot allocated from the base station (for example, refer patent document 1).
　ところで、ＷｉＭＡＸでは、５ＭＨｚ／７ＭＨｚ／１０ＭＨｚ／２０ＭＨｚといった複数の周波数帯域が使用可能であるが、通常、１つの周波数帯域でセルを構成するため、各基地局には、いずれか１つの周波数帯域が割り当てられる。 By the way, in WiMAX, a plurality of frequency bands such as 5 MHz / 7 MHz / 10 MHz / 20 MHz can be used. Usually, since a cell is configured with one frequency band, each base station has one frequency band. Assigned.
　そのため、上りリンクの場合、端末に割り当てられる周波数は、ＷｉＭＡＸで使用可能な複数の周波数帯域のうち、帯域要求を行った基地局に割り当てられている１つの周波数帯域内の周波数のみである。 Therefore, in the case of uplink, the frequency allocated to the terminal is only a frequency within one frequency band allocated to the base station that has requested the band among a plurality of frequency bands that can be used in WiMAX.
　また、下りリンクの場合も、基地局に割り当てられる周波数は、その基地局に割り当てられている１つの周波数帯域内の周波数のみである。 Also in the case of downlink, the frequency allocated to a base station is only the frequency within one frequency band allocated to the base station.
　このように、ＷｉＭＡＸでは、上りリンクおよび下りリンクの双方において、使用可能な周波数帯域を有効に利用できていない。 Thus, in WiMAX, the usable frequency band cannot be used effectively in both the uplink and the downlink.
　以上のことから、ＷｉＭＡＸ方式に代表される、複数の周波数帯域が使用可能な通信方式の無線通信システムでは、上りリンクまたは下りリンクにおいて、使用可能な周波数帯域をより有効に利用することが重要な課題になっている。
特表２００８－５０３９３５号公報 From the above, in a wireless communication system that can use a plurality of frequency bands represented by the WiMAX system, it is important to more effectively use the usable frequency band in the uplink or the downlink. It has become an issue.
Special table 2008-503935 gazette
　そこで、本発明の目的は、上述した課題を解決する無線通信システム、端末、基地局、無線通信方法を提供することにある。 Therefore, an object of the present invention is to provide a wireless communication system, a terminal, a base station, and a wireless communication method that solve the above-described problems.
　本発明の第１の無線通信システムは、
　端末と基地局間で無線通信を行う無線通信システムであって、
　互いに隣接する第１の基地局および第２の基地局を備え、
　前記第１の基地局および前記第２の基地局は、互いに異なる周波数帯域が割り当てられており、前記第１の基地局および前記第２の基地局のセル境界に位置する端末から上りリンクの帯域要求を受けた場合、自局の周波数帯域内の周波数を割り当て、
　前記端末は、前記第１の基地局および前記第２の基地局のそれぞれから割り当てられた周波数を使用して、前記第１の基地局および前記第２の基地局のうち通信中の基地局に対して上りリンクのデータを送信する。 The first wireless communication system of the present invention includes:
A wireless communication system for performing wireless communication between a terminal and a base station,
A first base station and a second base station adjacent to each other;
The first base station and the second base station are assigned different frequency bands, and uplink bands from terminals located at cell boundaries of the first base station and the second base station. When receiving a request, assign a frequency within the frequency band of your station,
The terminal uses a frequency allocated from each of the first base station and the second base station, to the communicating base station among the first base station and the second base station. On the other hand, uplink data is transmitted.
　本発明の第２の無線通信システムは、
　端末と基地局間で無線通信を行う無線通信システムであって、
　互いに隣接する第１の基地局および第２の基地局を備え、
　前記第１の基地局および前記第２の基地局は、互いに異なる周波数帯域が割り当てられており、
　前記第１の基地局は、前記第２の基地局とのセル境界に位置する端末を介して、前記第２の基地局に対して、下りリンクの帯域要求を行い、
　前記第２の基地局は、前記第１の基地局から下りリンクの帯域要求を受けた場合、自局の周波数帯域内の周波数を割り当て、
　前記第１の基地局は、自局の周波数帯域内の周波数と前記第２の基地局から割り当てられた周波数とを使用して、前記端末に下りリンクのデータを送信する。 The second wireless communication system of the present invention is
A wireless communication system for performing wireless communication between a terminal and a base station,
A first base station and a second base station adjacent to each other;
The first base station and the second base station are assigned different frequency bands,
The first base station makes a downlink bandwidth request to the second base station via a terminal located at a cell boundary with the second base station,
When the second base station receives a downlink bandwidth request from the first base station, the second base station assigns a frequency within the frequency band of the local station,
The first base station transmits downlink data to the terminal using a frequency within its own frequency band and a frequency assigned by the second base station.
　本発明の端末は、
　自端末が、通信中の基地局と該基地局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の基地局と隣接基地局に対し、上りリンクの帯域要求を行う帯域要求部と、
　通信中の基地局から割り当てられた周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の基地局に上りリンクのデータを送信するデータ送信部と、を有する。 The terminal of the present invention
When the own terminal is located at a cell boundary between a base station in communication and an adjacent base station to which a frequency band different from the base station is allocated, an uplink band is transmitted to the base station in communication and the adjacent base station. A bandwidth request unit for making a request;
A data transmission unit configured to transmit uplink data to the communicating base station using the frequency allocated from the communicating base station and the frequency allocated from the adjacent base station.
　本発明の第１の基地局は、
　自局と通信中および非通信中の端末からの帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当部を有する。 The first base station of the present invention
In response to a bandwidth request from a terminal that is communicating with or not communicating with its own station, a bandwidth allocating unit that assigns a frequency within the frequency band of the own station is provided.
　本発明の第２の基地局は、
　自局と通信中の端末が、自局と自局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の端末を経由して隣接基地局に対し、下りリンクの帯域要求を行う帯域要求部と、
　隣接基地局からの端末を経由した帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当部と、
　自局の周波数帯域内の周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の端末に下りリンクのデータを送信するデータ送信部と、を有する。 The second base station of the present invention
When a terminal in communication with the local station is located at a cell boundary between the local station and an adjacent base station to which a different frequency band is allocated, the downlink to the adjacent base station via the terminal in communication A bandwidth request unit for requesting a bandwidth of the link;
In response to a bandwidth request from a neighboring base station via a terminal, a bandwidth allocation unit that allocates a frequency within the frequency band of the local station;
A data transmission unit configured to transmit downlink data to a terminal in communication using a frequency within the frequency band of the own station and a frequency allocated by an adjacent base station.
　本発明の第１の無線通信方法は、
　端末による無線通信方法であって、
　自端末が、通信中の基地局と該基地局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の基地局と隣接基地局に対し、上りリンクの帯域要求を行う帯域要求ステップと、
　通信中の基地局から割り当てられた周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の基地局に上りリンクのデータを送信するデータ送信ステップと、を有する。 The first wireless communication method of the present invention includes:
A wireless communication method using a terminal,
When the own terminal is located at a cell boundary between a base station in communication and an adjacent base station to which a frequency band different from the base station is allocated, an uplink band is transmitted to the base station in communication and the adjacent base station. A bandwidth request step for making a request;
A data transmission step of transmitting uplink data to the communicating base station using the frequency allocated from the communicating base station and the frequency allocated from the adjacent base station.
　本発明の第２の無線通信方法は、
　基地局による無線通信方法であって、
　自局と通信中の端末と非通信中の端末からの帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当ステップを有する。 The second wireless communication method of the present invention includes:
A wireless communication method by a base station,
In response to a bandwidth request from a terminal communicating with the own station and a terminal not communicating with the own station, a bandwidth allocation step of allocating a frequency within the frequency band of the own station is provided.
　本発明の第３の無線通信方法は、
　基地局による無線通信方法であって、
　自局と通信中の端末が、自局と自局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の端末を経由して隣接基地局に対し、下りリンクの帯域要求を行う帯域要求ステップと、
　自局の周波数帯域内の周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の端末に下りリンクのデータを送信するデータ送信ステップと、を有する。 The third wireless communication method of the present invention is:
A wireless communication method by a base station,
When a terminal in communication with the local station is located at a cell boundary between the local station and an adjacent base station to which a different frequency band is allocated, the downlink to the adjacent base station via the terminal in communication A bandwidth request step for requesting a bandwidth of the link;
A data transmission step of transmitting downlink data to a terminal in communication using a frequency within the frequency band of the own station and a frequency allocated by an adjacent base station.
　本発明の第４の無線通信方法は、
　基地局による無線通信方法であって、
　隣接基地局からの端末を経由した帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当ステップを有する。 The fourth wireless communication method of the present invention is:
A wireless communication method by a base station,
In response to a bandwidth request from a neighboring base station via a terminal, a bandwidth allocation step of allocating a frequency within the frequency band of the local station is provided.
　本発明の第１の無線通信システムによれば、第１の基地局および第２の基地局は、互いに隣接しかつ互いに異なる周波数帯域が割り当てられており、セル境界に位置する端末から上りリンクの帯域要求を受けた場合、自局の周波数帯域内の周波数を割り当て、端末は、第１の基地局および第２の基地局のそれぞれから割り当てられた周波数を使用して、上りリンクのデータを送信する。 According to the first radio communication system of the present invention, the first base station and the second base station are assigned frequency bands that are adjacent to each other and different from each other, and are uplinked from a terminal located at a cell boundary. When a bandwidth request is received, a frequency within the frequency band of the local station is allocated, and the terminal transmits uplink data using the frequency allocated from each of the first base station and the second base station. To do.
　そのため、上りリンクにおいては、端末に対し、第１の基地局および第２の基地局から周波数を割り当てることが可能となるため、無線通信システムにおいて使用可能な周波数帯域を、より有効に利用することができるという効果が得られる。 Therefore, in the uplink, since it is possible to allocate frequencies to the terminal from the first base station and the second base station, more efficiently use the frequency band that can be used in the radio communication system. The effect of being able to be obtained.
　本発明の第２の無線通信システムによれば、第１の基地局および第２の基地局は、互いに隣接しかつ互いに異なる周波数帯域が割り当てられており、第２の基地局は、第１の基地局から下りリンクの帯域要求を受けた場合、自局の周波数帯域内の周波数を割り当て、第１の基地局は、自局の周波数帯域内の周波数と第２の基地局から割り当てられた周波数とを使用して、下りリンクのデータを送信する。 According to the second wireless communication system of the present invention, the first base station and the second base station are assigned to different frequency bands adjacent to each other, and the second base station When a downlink bandwidth request is received from the base station, a frequency within the frequency band of the local station is allocated, and the first base station allocates a frequency within the frequency band of the local station and a frequency allocated from the second base station. Are used to transmit downlink data.
　そのため、下りリンクにおいては、第１の基地局に対し、第１の基地局の周波数帯域内の周波数を割り当てるだけでなく、第２の基地局からも周波数を割り当てることが可能となるため、無線通信システムにおいて使用可能な周波数帯域を、より有効に利用することができるという効果が得られる。 Therefore, in the downlink, not only the frequency within the frequency band of the first base station can be allocated to the first base station, but also the frequency can be allocated from the second base station. The effect that the frequency band which can be used in a communication system can be utilized more effectively is acquired.
本発明の一実施形態の無線通信システムの構成を示すブロック図である。It is a block diagram which shows the structure of the radio | wireless communications system of one Embodiment of this invention. 図１に示した端末および基地局の内部構成を示すブロック図である。It is a block diagram which shows the internal structure of the terminal and base station which were shown in FIG. 図１に示した無線通信システムの上りリンクにおけるデータ送信時の動作を説明するフローチャートである。3 is a flowchart for explaining an operation at the time of data transmission in the uplink of the wireless communication system shown in FIG. 1. 図１に示した無線通信システムの上りリンクにおける効果を説明する図である。It is a figure explaining the effect in the uplink of the radio | wireless communications system shown in FIG. 図１に示した無線通信システムの下りリンクにおけるデータ送信時の動作を説明するフローチャートである。3 is a flowchart for explaining an operation at the time of data transmission in the downlink of the wireless communication system shown in FIG. 1. 図１に示した無線通信システムの下りリンクにおける効果を説明する図である。It is a figure explaining the effect in the downlink of the radio | wireless communications system shown in FIG.
　例えば、ＷｉＭＡＸでは、５ＭＨｚ／７ＭＨｚ／１０ＭＨｚ／２０ＭＨｚといった複数の周波数帯域が使用可能であり、各基地局にはいずれか１つの周波数帯域が割り当てられるため、隣接基地局間で、異なる周波数帯域が割り当てられている場合がある。 For example, in WiMAX, a plurality of frequency bands such as 5 MHz / 7 MHz / 10 MHz / 20 MHz can be used, and any one frequency band is allocated to each base station, so that different frequency bands are allocated between adjacent base stations. May have been.
　本実施形態は、隣接基地局間で異なる周波数帯域が割り当てられている場合において、隣接基地局に空きのある周波数があれば、その周波数をもデータの送信に使用しようとするものである。 In this embodiment, when different frequency bands are allocated between adjacent base stations, if there is a free frequency in the adjacent base station, that frequency is also used for data transmission.
　なお、以下で説明する実施形態では、ＷｉＭＡＸ方式の無線通信システムを例に挙げて説明するが、本発明はＷｉＭＡＸ方式に限らず、複数の周波数帯域が使用可能な通信方式であれば適用可能である。 In the embodiment described below, a WiMAX wireless communication system will be described as an example. However, the present invention is not limited to the WiMAX system, and may be applied to any communication system that can use a plurality of frequency bands. is there.
　図１は、本発明の一実施形態の無線通信システムの構成を示す図である。 FIG. 1 is a diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.
　図１を参照すると、本実施形態の無線通信システムは、端末ＭＳと、基地局ＢＳ１，ＢＳ２と、を有している。 Referring to FIG. 1, the wireless communication system of the present embodiment includes a terminal MS and base stations BS1 and BS2.
　なお、図１においては、基地局ＢＳ１は、周波数帯域ｆ１（例えば、１０ＭＨｚ）が割り当てられており、また、基地局ＢＳ２は、基地局ＢＳ１と隣接し、基地局ＢＳ１とは異なる周波数帯域ｆ２（例えば、２０ＭＨｚ）が割り当てられているものとする。また、端末ＭＳは、基地局ＢＳ１が無線通信サービスを提供する領域であるセルＣ１と基地局ＢＳ２が無線通信サービスを提供する領域であるセルＣ２とのセル境界に位置しているものとする。 In FIG. 1, the base station BS1 is assigned a frequency band f1 (for example, 10 MHz), and the base station BS2 is adjacent to the base station BS1 and has a frequency band f2 (different from the base station BS1). For example, it is assumed that 20 MHz) is allocated. Further, the terminal MS is assumed to be located at a cell boundary between a cell C1 in which the base station BS1 provides a radio communication service and a cell C2 in which the base station BS2 provides a radio communication service.
　また、図１においては、説明を簡単にするために、１つの端末ＭＳおよび２つの基地局ＢＳ１，ＢＳ２のみを示しているが、実際には、その他の端末および基地局も設けられているものとする。また、端末ＭＳは、２つの基地局ＢＳ１，ＢＳ２のセル境界に位置するものとしているが、本発明はこれに限定されず、３つ以上の基地局のセル境界に位置している場合も適用可能である。 Further, in FIG. 1, only one terminal MS and two base stations BS1 and BS2 are shown for simplicity of explanation, but actually other terminals and base stations are also provided. And The terminal MS is assumed to be located at the cell boundary between the two base stations BS1 and BS2. However, the present invention is not limited to this, and the case where the terminal MS is located at the cell boundary between three or more base stations is also applicable. Is possible.
　ここで、端末ＭＳおよび基地局ＢＳ１，ＢＳ２の内部構成について説明する。 Here, the internal configurations of the terminal MS and the base stations BS1 and BS2 will be described.
　図２は、端末ＭＳおよび基地局ＢＳ１，ＢＳ２の内部構成を示すブロック図である。 FIG. 2 is a block diagram showing an internal configuration of the terminal MS and the base stations BS1 and BS2.
　なお、図２においては、端末ＭＳおよび基地局ＢＳ１，ＢＳ２の構成要素のうち、本発明の本質的部分の構成要素のみを示し、その他の構成要素は省略している。 In FIG. 2, only the essential components of the present invention are shown among the components of the terminal MS and the base stations BS1 and BS2, and the other components are omitted.
　図２を参照すると、端末ＭＳは、通信部１０１と、帯域要求部１０２と、データ送信部１０３と、拡大帯域通知部１０４と、帯域要求転送部１０５と、を有している。ここでは、端末ＭＳの構成要素の動作について、基地局ＢＳ１と通信中である場合を想定して説明するが、基地局ＢＳ２と通信中である場合の動作も同様である。 2, the terminal MS includes a communication unit 101, a bandwidth request unit 102, a data transmission unit 103, an expanded bandwidth notification unit 104, and a bandwidth request transfer unit 105. Here, the operation of the components of the terminal MS will be described assuming that communication is being performed with the base station BS1, but the operation when communication is being performed with the base station BS2 is also the same.
　通信部１０１は、基地局ＢＳ１，ＢＳ２の各々と無線通信を行う。 The communication unit 101 performs wireless communication with each of the base stations BS1 and BS2.
　帯域要求部１０２は、基地局ＢＳ１と端末ＭＳとの通信中に、基地局ＢＳ１に送信すべき上りデータが生じた場合、基地局ＢＳ１と基地局ＢＳ２に対し、上りリンクの帯域要求を行う。 When the uplink data to be transmitted to the base station BS1 occurs during the communication between the base station BS1 and the terminal MS, the bandwidth request unit 102 makes an uplink bandwidth request to the base station BS1 and the base station BS2.
　データ送信部１０３は、基地局ＢＳ２から周波数が割り当てられた場合、基地局ＢＳ１から割り当てられた周波数帯域ｆ１内の周波数と基地局ＢＳ２から割り当てられた周波数帯域ｆ２内の周波数とを使用して、基地局ＢＳ１に上りデータを送信する。 When the frequency is allocated from the base station BS2, the data transmission unit 103 uses the frequency in the frequency band f1 allocated from the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2. Uplink data is transmitted to the base station BS1.
　一方、データ送信部１０３は、基地局ＢＳ２から周波数が割り当てられなかった場合、基地局ＢＳ１から割り当てられた周波数帯域ｆ１内の周波数のみを使用して、基地局ＢＳ１に上りデータを送信する。 On the other hand, when a frequency is not assigned from the base station BS2, the data transmission unit 103 transmits uplink data to the base station BS1 using only the frequency within the frequency band f1 assigned from the base station BS1.
　拡大帯域通知部１０４は、基地局ＢＳ２から周波数が割り当てられた場合、その周波数とその周波数が割り当てられた時間帯とを、基地局ＢＳ１に通知する。 When the frequency is assigned from the base station BS2, the expanded band notification unit 104 notifies the base station BS1 of the frequency and the time zone to which the frequency is assigned.
　帯域要求転送部１０５は、基地局ＢＳ１と端末ＭＳとの通信中に、基地局ＢＳ１から下りリンクの帯域要求を受信した場合、その帯域要求を基地局ＢＳ２に転送する。 When the bandwidth request transfer unit 105 receives a downlink bandwidth request from the base station BS1 during communication between the base station BS1 and the terminal MS, the bandwidth request transfer unit 105 transfers the bandwidth request to the base station BS2.
　また、図２を参照すると、基地局ＢＳ１，ＢＳ２の各々は、通信部２０１と、帯域割当部２０２と、帯域要求部２０３と、データ送信部２０４と、を有している。ここでは、基地局ＢＳ１の構成要素の動作について説明するが、基地局ＢＳ２の構成要素の動作も同様である。 Referring to FIG. 2, each of the base stations BS1 and BS2 includes a communication unit 201, a band allocation unit 202, a band request unit 203, and a data transmission unit 204. Here, the operation of the components of the base station BS1 will be described, but the operation of the components of the base station BS2 is the same.
　通信部２０１は、端末ＭＳと無線通信を行う。 The communication unit 201 performs wireless communication with the terminal MS.
　帯域割当部２０２は、基地局ＢＳ１と端末ＭＳとの通信中に、端末ＭＳから上りリンクの帯域要求を受信した場合、周波数帯域ｆ１内の周波数を割り当てる。 The band allocation unit 202 allocates a frequency in the frequency band f1 when receiving an uplink band request from the terminal MS during communication between the base station BS1 and the terminal MS.
　一方、帯域割当部２０２は、基地局ＢＳ１と端末ＭＳとの非通信中に、端末ＭＳから上りリンクの帯域要求を受信した場合、基地局ＢＳ１と通信中の他の端末のいずれにも周波数を割り当てていない時間帯がある場合にのみ、その時間帯において、周波数帯域ｆ１内の周波数を割り当てる。 On the other hand, when the bandwidth allocation unit 202 receives an uplink bandwidth request from the terminal MS while the base station BS1 is not communicating with the terminal MS, the bandwidth allocating unit 202 assigns a frequency to any of the other terminals communicating with the base station BS1. Only when there is an unassigned time zone, the frequency in the frequency band f1 is assigned in that time zone.
　また、帯域割当部２０２は、基地局ＢＳ２と端末ＭＳとの通信中に、基地局ＢＳ２から端末ＭＳを経由して下りリンクの帯域要求を受信した場合、基地局ＢＳ１に周波数を割り当てていない時間帯がある場合にのみ、その時間帯において、周波数帯域ｆ１内の周波数を割り当てる。 In addition, when the bandwidth allocation unit 202 receives a downlink bandwidth request from the base station BS2 via the terminal MS during the communication between the base station BS2 and the terminal MS, the time when the frequency is not allocated to the base station BS1 Only when there is a band, a frequency in the frequency band f1 is allocated in the time band.
　帯域要求部２０３は、基地局ＢＳ１と端末ＭＳとの通信中に、端末ＭＳに送信すべき下りデータが生じた場合、端末ＭＳを経由して基地局ＢＳ２に対し、下りリンクの帯域要求を行う。 The bandwidth request unit 203 makes a downlink bandwidth request to the base station BS2 via the terminal MS when downlink data to be transmitted to the terminal MS occurs during communication between the base station BS1 and the terminal MS. .
　データ送信部２０４は、基地局ＢＳ２から周波数が割り当てられた場合、基地局ＢＳ１に割り当てられた周波数帯域ｆ１内の周波数と基地局ＢＳ２から割り当てられた周波数帯域ｆ２内の周波数とを使用して、端末ＭＳに下りデータを送信する。 When the frequency is allocated from the base station BS2, the data transmission unit 204 uses the frequency in the frequency band f1 allocated to the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2. Downlink data is transmitted to the terminal MS.
　一方、データ送信部２０４は、基地局ＢＳ２から周波数が割り当てられなかった場合、基地局ＢＳ１に割り当てられた周波数帯域ｆ１内の周波数のみを使用して、端末ＭＳに下りデータを送信する。 On the other hand, when the frequency is not allocated from the base station BS2, the data transmission unit 204 transmits downlink data to the terminal MS using only the frequency within the frequency band f1 allocated to the base station BS1.
　以下、本実施形態の無線通信システムのデータ送信時の動作について、上りリンクの場合と下りリンクの場合とに分けて説明する。なお、以下では、端末ＭＳは、基地局ＢＳ１と通信中であるものとする。 Hereinafter, the operation at the time of data transmission of the wireless communication system of the present embodiment will be described separately for the uplink case and the downlink case. In the following, it is assumed that terminal MS is communicating with base station BS1.
　［上りリンクの場合］
　図３は、本実施形態の無線通信システムの上りリンクにおけるデータ送信時の動作を説明するフローチャートである。 [For uplink]
FIG. 3 is a flowchart for explaining the operation at the time of data transmission in the uplink of the wireless communication system of this embodiment.
　図３を参照すると、端末ＭＳの帯域要求部１０２は、基地局ＢＳ１との通信中に、基地局ＢＳ１に送信すべき上りデータが生じた場合（ステップ３０１）、基地局ＢＳ１と基地局ＢＳ２に対し、上りリンクの帯域要求を行う（ステップ３０２，３０３）。 Referring to FIG. 3, when the uplink data to be transmitted to the base station BS1 is generated during communication with the base station BS1 (step 301), the bandwidth request unit 102 of the terminal MS transmits to the base station BS1 and the base station BS2. On the other hand, an uplink bandwidth request is made (steps 302 and 303).
　次に、基地局ＢＳ１の帯域割当部２０２は、端末ＭＳに対し、周波数帯域ｆ１内の周波数とその周波数を使用可能な時間帯とを割り当て、割り当てた周波数と時間帯とを端末ＭＳに通知する（ステップ３０４）。 Next, the band allocation unit 202 of the base station BS1 allocates a frequency within the frequency band f1 and a time zone in which the frequency can be used to the terminal MS, and notifies the terminal MS of the allocated frequency and time zone. (Step 304).
　次に、基地局ＢＳ２の帯域割当部２０２は、端末ＭＳからの上りリンクの帯域要求に対し、上りリンクの帯域に空きがあるか、具体的には、基地局ＢＳ２と通信中の他の端末のいずれにも周波数を割り当てていない時間帯があるかを確認する（ステップ３０５）。 Next, the bandwidth allocating unit 202 of the base station BS2 determines whether there is a vacancy in the uplink bandwidth in response to the uplink bandwidth request from the terminal MS, specifically, another terminal communicating with the base station BS2. It is confirmed whether there is a time zone in which no frequency is assigned to any of them (step 305).
　ステップ３０５において、基地局ＢＳ２と通信中の他の端末のいずれにも周波数を割り当てていない時間帯がない場合、基地局ＢＳ２の帯域割当部２０２は、端末ＭＳへの周波数の割り当てが失敗した旨を端末ＭＳに通知する（ステップ３０６）。 In step 305, when there is no time zone in which no frequency is assigned to any of the other terminals communicating with the base station BS2, the band assignment unit 202 of the base station BS2 indicates that the assignment of the frequency to the terminal MS has failed. To the terminal MS (step 306).
　その後、端末ＭＳのデータ送信部１０３は、基地局ＢＳ１から割り当てられた周波数帯域ｆ１内の周波数のみを使用して、基地局ＢＳ１に上りデータを送信する（ステップ３０７）。 Thereafter, the data transmission unit 103 of the terminal MS transmits the uplink data to the base station BS1 using only the frequency within the frequency band f1 allocated from the base station BS1 (step 307).
　一方、ステップ３０５において、基地局ＢＳ２と通信中の他の端末のいずれにも周波数を割り当てていない時間帯がある場合、基地局ＢＳ２の帯域割当部２０２は、その時間帯において、端末ＭＳに対し、周波数帯域ｆ２内の周波数を割り当て、割り当てた周波数と時間帯を端末ＭＳに通知する（ステップ３０８）。これにより、端末ＭＳにおいて、上りデータの送信に使用する周波数は、基地局ＢＳ２から割り当てられた周波数まで拡大される。 On the other hand, if there is a time zone in which no frequency is assigned to any of the other terminals communicating with the base station BS2 in step 305, the band assignment unit 202 of the base station BS2 The frequency in the frequency band f2 is allocated, and the allocated frequency and time band are notified to the terminal MS (step 308). Thereby, in terminal MS, the frequency used for transmission of uplink data is expanded to the frequency allocated from base station BS2.
　次に、端末ＭＳの拡大帯域通知部１０４は、基地局ＢＳ２から割り当てられた周波数と時間帯とを、基地局ＢＳ１に通知する（ステップ３０９）。 Next, the expanded band notification unit 104 of the terminal MS notifies the base station BS1 of the frequency and time zone allocated from the base station BS2 (step 309).
　その後、端末ＭＳのデータ送信部１０３は、ステップ３０９の通知に対する応答としてＡＣＫメッセージを受信すると（ステップ３１０）、基地局ＢＳ１から割り当てられた周波数帯域ｆ１内の周波数と基地局ＢＳ２から割り当てられた周波数帯域ｆ２内の周波数とを使用して、基地局ＢＳ１に上りデータを送信する（ステップ３１１）。 Thereafter, when the data transmission unit 103 of the terminal MS receives the ACK message as a response to the notification in Step 309 (Step 310), the frequency in the frequency band f1 allocated from the base station BS1 and the frequency allocated from the base station BS2 The uplink data is transmitted to the base station BS1 using the frequency in the band f2 (step 311).
　上述したように本実施形態においては、端末ＭＳと基地局ＢＳ１とが通信中である場合、端末ＭＳは、通信中の基地局ＢＳ１だけでなく、基地局ＢＳ１と隣接し基地局ＢＳ１とは異なる周波数帯域が割り当てられた基地局ＢＳ２に対しても、上りリンクの帯域要求を行い、基地局ＢＳ１から割り当てられた周波数帯域ｆ１内の周波数と基地局ＢＳ２から割り当てられた周波数帯域ｆ２内の周波数とを使用して、基地局ＢＳ１に上りデータを送信する。 As described above, in the present embodiment, when the terminal MS and the base station BS1 are communicating, the terminal MS is not only the communicating base station BS1, but is adjacent to the base station BS1 and is different from the base station BS1. An uplink bandwidth request is also made to the base station BS2 to which the frequency band is allocated, and the frequency in the frequency band f1 allocated from the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2 Is used to transmit uplink data to the base station BS1.
　そのため、図４に示すように、上りリンクにおいては、端末ＭＳに対し、基地局ＢＳ１から周波数帯域ｆ１内の周波数を割り当てるだけでなく、基地局ＢＳ２から周波数帯域ｆ２内の周波数を割り当てることが可能となるため、無線通信システムにおいて使用可能な周波数帯域を、より有効に利用することができるという効果が得られる。 Therefore, as shown in FIG. 4, in the uplink, not only the frequency in the frequency band f1 from the base station BS1 but also the frequency in the frequency band f2 can be allocated from the base station BS2 to the terminal MS. Therefore, the effect that the frequency band that can be used in the wireless communication system can be used more effectively can be obtained.
　［下りリンクの場合］
　図５は、本実施形態の無線通信システムの下りリンクの場合におけるデータ送信時の動作を説明するフローチャートである。 [For downlink]
FIG. 5 is a flowchart for explaining the operation at the time of data transmission in the case of the downlink of the wireless communication system of the present embodiment.
　図５を参照すると、基地局ＢＳ１の帯域要求部２０３は、端末ＭＳとの通信中に、端末ＭＳに送信すべき下りデータが生じた場合（ステップ５０１）、端末ＭＳに対し、基地局ＢＳ２への下りリンクの帯域要求を行う（ステップ５０２）。 Referring to FIG. 5, when the downlink data to be transmitted to the terminal MS is generated during communication with the terminal MS (step 501), the bandwidth request unit 203 of the base station BS1 sends the terminal MS to the base station BS2. Next, a downlink bandwidth request is made (step 502).
　次に、端末ＭＳの帯域要求転送部１０５は、基地局ＢＳ１からの、基地局ＢＳ２への下りリンクの帯域要求を基地局ＢＳ２に転送する（ステップ５０３）。 Next, the bandwidth request transfer unit 105 of the terminal MS transfers the downlink bandwidth request from the base station BS1 to the base station BS2 to the base station BS2 (step 503).
　次に、基地局ＢＳ２の帯域割当部２０２は、下りリンクの帯域に空きがあるか、具体的には、基地局ＢＳ２に周波数を割り当てていない時間帯があるかを確認する（ステップ５０４）。 Next, the band allocating unit 202 of the base station BS2 confirms whether there is a vacant downlink band, specifically, whether there is a time zone in which no frequency is allocated to the base station BS2 (step 504).
　ステップ５０４において、基地局ＢＳ２に周波数を割り当てていない時間帯がない場合、基地局ＢＳ２の帯域割当部２０２は、基地局ＢＳ１への周波数の割り当てが失敗した旨を端末ＭＳに通知する（ステップ５０５）。 In step 504, when there is no time zone in which no frequency is allocated to the base station BS2, the band allocation unit 202 of the base station BS2 notifies the terminal MS that the frequency allocation to the base station BS1 has failed (step 505). ).
　次に、端末ＭＳの帯域要求転送部１０５は、基地局ＢＳ１への周波数の割り当てが失敗した旨の通知を、基地局ＢＳ１に転送する（ステップ５０６）。 Next, the bandwidth request transfer unit 105 of the terminal MS transfers a notification that the frequency allocation to the base station BS1 has failed to the base station BS1 (step 506).
　その後、基地局ＢＳ１のデータ送信部２０４は、基地局ＢＳ１に割り当てられた周波数帯域ｆ１内の周波数のみを使用して、端末ＭＳに下りデータを送信する（ステップ５０７）。 Thereafter, the data transmission unit 204 of the base station BS1 transmits downlink data to the terminal MS using only the frequency within the frequency band f1 allocated to the base station BS1 (step 507).
　一方、ステップ５０４において、基地局ＢＳ２に周波数を割り当てていない時間帯がある場合、基地局ＢＳ２の帯域割当部２０２は、その時間帯において、基地局ＢＳ１に対し、周波数帯域ｆ２内の周波数を割り当て、割り当てた周波数と時間帯を端末ＭＳに通知する（ステップ５０８）。これにより、基地局ＢＳ１において、下りデータの送信に使用する周波数は、基地局ＢＳ２から割り当てられた周波数まで拡大される。 On the other hand, if there is a time zone in which no frequency is assigned to the base station BS2 in step 504, the band assignment unit 202 of the base station BS2 assigns a frequency in the frequency band f2 to the base station BS1 in that time zone. The terminal MS is notified of the allocated frequency and time zone (step 508). Thereby, in base station BS1, the frequency used for transmission of downlink data is expanded to the frequency allocated from base station BS2.
　次に、端末ＭＳの帯域要求転送部１０５は、基地局ＢＳ２から基地局ＢＳ１へ割り当てられた周波数と時間帯とを、基地局ＢＳ１に通知する（ステップ５０９）。 Next, the bandwidth request transfer unit 105 of the terminal MS notifies the base station BS1 of the frequency and time zone allocated from the base station BS2 to the base station BS1 (step 509).
　その後、基地局ＢＳ１のデータ送信部２０４は、基地局ＢＳ１に割り当てられた周波数帯域ｆ１内の周波数と基地局ＢＳ２から割り当てられた周波数帯域ｆ２内の周波数とを使用して、端末ＭＳに下りデータを送信する（ステップ５１０）。 Thereafter, the data transmission unit 204 of the base station BS1 uses the frequency in the frequency band f1 allocated to the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2 to the terminal MS to download downlink data. Is transmitted (step 510).
　上述したように本実施形態においては、端末ＭＳと基地局ＢＳ１とが通信中である場合、基地局ＢＳ１は、基地局ＢＳ１と隣接し基地局ＢＳ１とは異なる周波数帯域が割り当てられた基地局ＢＳ２に対して、端末ＭＳを経由して、下りリンクの帯域要求を行い、基地局ＢＳ１に割り当てられた周波数帯域ｆ１内の周波数と基地局ＢＳ２から割り当てられた周波数帯域ｆ２内の周波数とを使用して、端末ＭＳに下りデータを送信する。 As described above, in the present embodiment, when the terminal MS and the base station BS1 are communicating, the base station BS1 is adjacent to the base station BS1 and is assigned with a different frequency band from the base station BS1. On the other hand, a downlink band request is made via the terminal MS, and the frequency in the frequency band f1 allocated to the base station BS1 and the frequency in the frequency band f2 allocated from the base station BS2 are used. Then, downlink data is transmitted to the terminal MS.
　そのため、図６に示すように、下りリンクにおいては、基地局ＢＳ１に対し、周波数帯域ｆ１内の周波数を割り当てるだけでなく、基地局ＢＳ２から周波数帯域ｆ２内の周波数を割り当てることが可能となるため、無線通信システムにおいて使用可能な周波数帯域を、より有効に利用することができるという効果が得られる。 Therefore, as shown in FIG. 6, in the downlink, not only can the frequency in the frequency band f1 be allocated to the base station BS1, but also the frequency in the frequency band f2 can be allocated from the base station BS2. Thus, an effect that the frequency band that can be used in the wireless communication system can be used more effectively can be obtained.
　以上、実施形態を参照して本発明を説明したが、本発明は上記実施形態に限定されものではない。本発明の構成や詳細には、本発明の範囲内で当業者が理解し得る様々な変更をすることができる。 The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　本出願は、２００８年４月１４日に出願された日本出願特願２００８－１０４５７２を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2008-104572 filed on Apr. 14, 2008, the entire disclosure of which is incorporated herein.

Claims (21)

  1. 　端末と基地局間で無線通信を行う無線通信システムであって、
    　互いに隣接する第１の基地局および第２の基地局を備え、
    　前記第１の基地局および前記第２の基地局は、互いに異なる周波数帯域が割り当てられており、前記第１の基地局および前記第２の基地局のセル境界に位置する端末から上りリンクの帯域要求を受けた場合、自局の周波数帯域内の周波数を割り当て、
    　前記端末は、前記第１の基地局および前記第２の基地局のそれぞれから割り当てられた周波数を使用して、前記第１の基地局および前記第２の基地局のうち通信中の基地局に対して上りリンクのデータを送信する、
    　無線通信システム。     A wireless communication system for performing wireless communication between a terminal and a base station,
    A first base station and a second base station adjacent to each other;
    The first base station and the second base station are assigned different frequency bands, and uplink bands from terminals located at cell boundaries of the first base station and the second base station. When receiving a request, assign a frequency within the frequency band of your station,
    The terminal uses a frequency allocated from each of the first base station and the second base station, to the communicating base station among the first base station and the second base station. Send uplink data to the
    Wireless communication system.
  2. 　前記第１の基地局および前記第２の基地局は、
    　自局と非通信中の端末からの帯域要求に対しては、自局と通信中の端末のいずれにも周波数を割り当てていない時間帯がある場合にのみ、該時間帯において、自局の周波数帯域内の周波数を割り当て、
    　前記端末は、
    　非通信中の基地局から周波数が割り当てられなかった場合、通信中の基地局から割り当てられた周波数のみを使用して、通信中の基地局に対して上りリンクのデータを送信する、請求項１に記載の無線通信システム。     The first base station and the second base station are:
    In response to a bandwidth request from a terminal that is not communicating with the local station, the frequency of the local station is determined only when there is a time period in which no frequency is assigned to any of the terminals communicating with the local station. Assign a frequency in the band,
    The terminal
    The uplink data is transmitted to the communicating base station using only the frequency assigned from the communicating base station when no frequency is assigned from the non-communicating base station. The wireless communication system according to 1.
  3. 　前記端末は、
    　非通信中の基地局から周波数が割り当てられた場合、該周波数と該周波数が割り当てられた時間帯とを、通信中の基地局に通知する、請求項１または２に記載の無線通信システム。     The terminal
    3. The wireless communication system according to claim 1, wherein, when a frequency is assigned from a non-communication base station, the base station in communication is notified of the frequency and a time zone to which the frequency is assigned.
  4. 　端末と基地局間で無線通信を行う無線通信システムであって、
    　互いに隣接する第１の基地局および第２の基地局を備え、
    　前記第１の基地局および前記第２の基地局は、互いに異なる周波数帯域が割り当てられており、
    　前記第１の基地局は、前記第２の基地局とのセル境界に位置する端末を介して、前記第２の基地局に対して、下りリンクの帯域要求を行い、
    　前記第２の基地局は、前記第１の基地局から下りリンクの帯域要求を受けた場合、自局の周波数帯域内の周波数を割り当て、
    　前記第１の基地局は、自局の周波数帯域内の周波数と前記第２の基地局から割り当てられた周波数とを使用して、前記端末に下りリンクのデータを送信する、
    　無線通信システム。     A wireless communication system for performing wireless communication between a terminal and a base station,
    A first base station and a second base station adjacent to each other;
    The first base station and the second base station are assigned different frequency bands,
    The first base station makes a downlink bandwidth request to the second base station via a terminal located at a cell boundary with the second base station,
    When the second base station receives a downlink bandwidth request from the first base station, the second base station assigns a frequency within the frequency band of the local station,
    The first base station transmits downlink data to the terminal using a frequency within its own frequency band and a frequency allocated from the second base station.
    Wireless communication system.
  5. 　前記第２の基地局は、
    　前記第１の基地局からの帯域要求に対し、自局に周波数を割り当てていない時間帯がある場合にのみ、該時間帯において、自局の周波数帯域内の周波数を割り当て、
    　前記第１の基地局は、
    　前記第２の基地局から周波数が割り当てられなかった場合、自局の周波数帯域内の周波数のみを使用して、前記端末に下りリンクのデータを送信する、請求項４に記載の無線通信システム。     The second base station is
    In response to the bandwidth request from the first base station, only when there is a time zone in which the frequency is not assigned to the own station, the frequency within the frequency band of the own station is assigned in the time zone,
    The first base station is
    The radio communication system according to claim 4, wherein when no frequency is allocated from the second base station, downlink data is transmitted to the terminal using only a frequency within a frequency band of the own station.
  6. 　自端末が、通信中の基地局と該基地局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の基地局と隣接基地局に対し、上りリンクの帯域要求を行う帯域要求部と、
    　通信中の基地局から割り当てられた周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の基地局に上りリンクのデータを送信するデータ送信部と、を有する、端末。     When the own terminal is located at a cell boundary between a base station in communication and an adjacent base station to which a frequency band different from the base station is allocated, an uplink band is transmitted to the base station in communication and the adjacent base station. A bandwidth request unit for making a request;
    A data transmission unit configured to transmit uplink data to a communicating base station using a frequency allocated from a communicating base station and a frequency allocated from an adjacent base station.
  7. 　前記データ送信部は、
    　隣接基地局から周波数が割り当てられなかった場合、通信中の基地局から割り当てられた周波数のみを使用して、通信中の基地局に上りリンクのデータを送信する、請求項６に記載の端末。     The data transmitter is
    The terminal according to claim 6, wherein when a frequency is not allocated from an adjacent base station, uplink data is transmitted to the communicating base station using only the frequency allocated from the communicating base station.
  8. 　隣接基地局から周波数が割り当てられた場合、該周波数と該周波数が割り当てられた時間帯とを、通信中の基地局に通知する拡大帯域通知部をさらに有する、請求項６または７に記載の端末。 The terminal according to claim 6 or 7, further comprising: an expanded band notification unit that notifies a base station in communication of the frequency and a time zone to which the frequency is allocated when a frequency is allocated from an adjacent base station. .
  9. 　自局と通信中および非通信中の端末からの帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当部を有する、基地局。 A base station having a band allocation unit that allocates a frequency within the frequency band of the local station in response to a band request from a terminal that is communicating with or not communicating with the local station.
  10. 　前記帯域割当部は、
    　自局と非通信中の端末からの帯域要求に対しては、自局と通信中の端末のいずれにも周波数を割り当てていない時間帯がある場合にのみ、該時間帯において、自局の周波数帯域内の周波数を割り当てる、請求項９に記載の基地局。     The bandwidth allocation unit
    In response to a bandwidth request from a terminal that is not communicating with the local station, the frequency of the local station is determined only when there is a time period in which no frequency is assigned to any of the terminals communicating with the local station. The base station according to claim 9, which allocates a frequency within a band.
  11. 　自局と通信中の端末が、自局と自局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の端末を経由して隣接基地局に対し、下りリンクの帯域要求を行う帯域要求部と、
    　隣接基地局からの端末を経由した帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当部と、
    　自局の周波数帯域内の周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の端末に下りリンクのデータを送信するデータ送信部と、を有する、基地局。     When a terminal in communication with the local station is located at a cell boundary between the local station and an adjacent base station to which a different frequency band is allocated, the downlink to the adjacent base station via the terminal in communication A bandwidth request unit for requesting a bandwidth of the link;
    In response to a bandwidth request from a neighboring base station via a terminal, a bandwidth allocation unit that allocates a frequency within the frequency band of the local station;
    A data transmission unit that transmits downlink data to a terminal in communication using a frequency within the frequency band of the local station and a frequency allocated by an adjacent base station.
  12. 　前記帯域割当部は、
    　隣接基地局からの端末を経由した帯域要求に対し、自局に周波数を割り当てていない時間帯がある場合にのみ、該時間帯において、自局の周波数帯域内の周波数を割り当て、
    　前記データ送信部は、
    　隣接基地局から周波数が割り当てられなかった場合、自局の周波数帯域内の周波数のみを使用して、通信中の端末に下りリンクのデータを送信する、請求項１１に記載の基地局。     The bandwidth allocation unit
    In response to a bandwidth request from a neighboring base station via a terminal, only when there is a time zone in which no frequency is assigned to the own station, in that time zone, a frequency within the frequency band of the own station is assigned,
    The data transmitter is
    The base station according to claim 11, wherein when a frequency is not allocated from an adjacent base station, downlink data is transmitted to a terminal in communication using only a frequency within the frequency band of the own station.
  13. 　端末による無線通信方法であって、
    　自端末が、通信中の基地局と該基地局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の基地局と隣接基地局に対し、上りリンクの帯域要求を行う帯域要求ステップと、
    　通信中の基地局から割り当てられた周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の基地局に上りリンクのデータを送信するデータ送信ステップと、を有する、無線通信方法。     A wireless communication method using a terminal,
    When the own terminal is located at a cell boundary between a base station in communication and an adjacent base station to which a frequency band different from the base station is allocated, an uplink band is transmitted to the base station in communication and the adjacent base station. A bandwidth request step for making a request;
    And a data transmission step of transmitting uplink data to the communicating base station using the frequency allocated from the communicating base station and the frequency allocated from the adjacent base station.
  14. 　前記データ送信ステップでは、
    　隣接基地局から周波数が割り当てられなかった場合、通信中の基地局から割り当てられた周波数のみを使用して、通信中の基地局に上りリンクのデータを送信する、請求項１３に記載の無線通信方法。     In the data transmission step,
    The wireless communication according to claim 13, wherein when no frequency is assigned from an adjacent base station, uplink data is transmitted to the communicating base station using only the frequency assigned from the communicating base station. Method.
  15. 　隣接基地局から周波数が割り当てられた場合、該周波数と該周波数が割り当てられた時間帯とを、通信中の基地局に通知する拡大帯域通知ステップをさらに有する、請求項１３または１４に記載の無線通信方法。 The radio according to claim 13 or 14, further comprising: an extended band notification step of notifying a base station in communication of the frequency and a time zone to which the frequency is allocated when a frequency is allocated from an adjacent base station. Communication method.
  16. 　基地局による無線通信方法であって、
    　自局と通信中の端末と非通信中の端末からの帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当ステップを有する、無線通信方法。     A wireless communication method by a base station,
    A wireless communication method, comprising: a bandwidth allocation step for allocating a frequency within a frequency band of the local station in response to a bandwidth request from a terminal that is not communicating with the terminal that is communicating with the local station.
  17. 　前記帯域割当ステップでは、
    　自局と非通信中の端末からの帯域要求に対しては、自局と通信中の端末のいずれにも周波数を割り当てていない時間帯がある場合にのみ、該時間帯において、自局の周波数帯域内の周波数を割り当てる、請求項１６に記載の無線通信方法。     In the bandwidth allocation step,
    In response to a bandwidth request from a terminal that is not communicating with the local station, the frequency of the local station is determined only when there is a time period in which no frequency is assigned to any of the terminals communicating with the local station. The wireless communication method according to claim 16, wherein a frequency in a band is assigned.
  18. 　基地局による無線通信方法であって、
    　自局と通信中の端末が、自局と自局とは異なる周波数帯域が割り当てられた隣接基地局とのセル境界に位置する場合、通信中の端末を経由して隣接基地局に対し、下りリンクの帯域要求を行う帯域要求ステップと、
    　自局の周波数帯域内の周波数と隣接基地局から割り当てられた周波数とを使用して、通信中の端末に下りリンクのデータを送信するデータ送信ステップと、を有する、無線通信方法。     A wireless communication method by a base station,
    When a terminal in communication with the local station is located at a cell boundary between the local station and an adjacent base station to which a different frequency band is allocated, the downlink to the adjacent base station via the terminal in communication A bandwidth request step for requesting a bandwidth of the link;
    And a data transmission step of transmitting downlink data to a terminal in communication using a frequency within the frequency band of the local station and a frequency assigned by an adjacent base station.
  19. 　前記データ送信ステップでは、
    　隣接基地局から周波数が割り当てられなかった場合、自局の周波数帯域内の周波数のみを使用して、通信中の端末に下りリンクのデータを送信する、請求項１８に記載の無線通信方法。     In the data transmission step,
    The radio communication method according to claim 18, wherein, when a frequency is not allocated from an adjacent base station, downlink data is transmitted to a terminal in communication using only a frequency within the frequency band of the local station.
  20. 　基地局による無線通信方法であって、
    　隣接基地局からの端末を経由した帯域要求に対し、自局の周波数帯域内の周波数を割り当てる帯域割当ステップを有する、無線通信方法。     A wireless communication method by a base station,
    A wireless communication method comprising a bandwidth allocation step of allocating a frequency within a frequency band of the local station in response to a bandwidth request from an adjacent base station via a terminal.
  21. 　前記帯域割当ステップでは、
    　隣接基地局からの端末を経由した帯域要求に対し、自局に周波数を割り当てていない時間帯がある場合にのみ、該時間帯において、自局の周波数帯域内の周波数を割り当てる、請求項２０に記載の無線通信方法。
          In the bandwidth allocation step,
    21. In response to a bandwidth request from a neighboring base station via a terminal, only when there is a time zone in which no frequency is assigned to the own station, a frequency within the frequency band of the own station is assigned in the time zone. The wireless communication method described.
PCT/JP2009/054321 2008-04-14 2009-03-06 Wireless communication system, terminal, base station and wireless communication method WO2009128303A1 (en)

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