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JP2008048148A - Mobile communication system, its frequency assigning method, and base station used therefor - Google Patents

Mobile communication system, its frequency assigning method, and base station used therefor Download PDF

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JP2008048148A
JP2008048148A JP2006221736A JP2006221736A JP2008048148A JP 2008048148 A JP2008048148 A JP 2008048148A JP 2006221736 A JP2006221736 A JP 2006221736A JP 2006221736 A JP2006221736 A JP 2006221736A JP 2008048148 A JP2008048148 A JP 2008048148A
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base station
frequency
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cell
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Masayuki Kumura
正行 九村
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NEC Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a frequency assigning system capable of raising frequency use efficiency, while evading interference between adjacent cells, in a mobile communication system. <P>SOLUTION: The frequency assigning method in the mobile communication system allows a base station to assign a plurality of frequencies in a prescribed frequency band, respectively, to a plurality of mobile stations in a self cell. The frequency assignment is performed in the base station, based on the position of the mobile station in the self cell and the frequency assignment state of the adjacent base station. When the mobile station is positioned near the center of the cell, the same frequency as the assignment frequency in the adjacent base station is assigned to the mobile station (steps S3, S5). When the mobile station is positioned near a cell boundary with the adjacent base station, the frequency assignment is performed by evading the assignment frequency in the adjacent base station (steps S3, S4). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は移動通信システム及びその周波数割り当て方法並びにそれに用いる基地局に関し、特に直交周波数分割多重（ＯＦＤＭ：Orthogonal Freqency Division Multiplexing ）伝送方式の移動通信システムにおける周波数割り当て方式に関するものである。   The present invention relates to a mobile communication system, a frequency allocation method thereof, and a base station used therefor, and more particularly to a frequency allocation method in an orthogonal frequency division multiplexing (OFDM) transmission communication system.

無線帯域を複数の移動局で共有して通信を行うパケット通信方式には、３ＧＰＰ（3rd Generation Partnership Project）にて標準化が行われているＨＳＤＰＡ（High Speed Downlink Packet Access ）や、ＬＴＥ（Long Term Evolution ）といった方式のものがある。後者のＬＴＥの下り回線のアクセス方式には、ＣＤＭＡ（Code Division Multiplexing Access ：符号分割多重接続）方式ではないＯＦＤＭ（Orthogonal Frequency Division Multiplexing）方式が検討されている。   For packet communication schemes in which a wireless band is shared by a plurality of mobile stations for communication, HSDPA (High Speed Downlink Packet Access) standardized by 3GPP (3rd Generation Partnership Project), LTE (Long Term Evolution) ). As the latter LTE downlink access scheme, an OFDM (Orthogonal Frequency Division Multiplexing) scheme that is not a CDMA (Code Division Multiplexing Access) scheme has been studied.

このＯＦＤＭ方式では、システムに割り当てられている無線帯域を複数の小さな無線帯域（Resource Block：ＲＢ）に分割しておき、基地局はＲＢ毎に１つの移動局を割り当てることにより、周波数分割を実現するようになっている。以下では、このＲＢをキャリア（またはサブキャリアブロック）と称する。   In this OFDM method, the frequency band is realized by dividing the radio band assigned to the system into a plurality of small radio bands (Resource Block: RB), and the base station assigns one mobile station for each RB. It is supposed to be. Hereinafter, this RB is referred to as a carrier (or subcarrier block).

このようなＯＦＤＭ方式の通信システムでは、隣接セルとの境界付近に位置する移動局は、受信するキャリア（またはサブキャリアブロック）が隣接セルの基地局で使用されているキャリア（またはサブキャリアブロック）と一致した場合に、隣接セルからの強力な干渉を受けることになる。この様な事態を避けるためには、隣接する基地局間で、使用するキャリア（またはサブキャリアブロック）の情報をやりとりして、互いに使用するキャリア（またはサブキャリアブロック）が重複しないように制御を行うことが考えられる。   In such an OFDM communication system, a mobile station located near the boundary with an adjacent cell is a carrier (or subcarrier block) in which a received carrier (or subcarrier block) is used by a base station of the adjacent cell. , It will receive strong interference from neighboring cells. To avoid such a situation, exchange information on the carrier (or subcarrier block) to be used between adjacent base stations, and control so that the carriers (or subcarrier blocks) to be used do not overlap each other. It is possible to do it.

なお、特許文献１を参照すると、システムに割り当てられている無線帯域を、予め４つのグループに分割しておき、互いに隣接するセル間の境界付近の移動局には、４つのグループのうちの３つのグループの各々を、互いに干渉し合わないように予め固定的に割り当て、各セルの中央付近に位置する移動局には、４つのグループのうちの残りの一つのグループを割り当てるようにして、干渉を防止した技術が開示されている。   Referring to Patent Document 1, the radio band allocated to the system is divided into four groups in advance, and mobile stations near the boundary between adjacent cells are classified into three of the four groups. Each of the two groups is fixedly assigned in advance so as not to interfere with each other, and the mobile station located near the center of each cell is assigned with the remaining one of the four groups. A technique for preventing the above is disclosed.

特開２００４−１５９３４５号公報JP 2004-159345 A

前述したような、隣接する基地局間で、使用するキャリア（またはサブキャリアブロック）の情報をやりとりして、互いに使用するキャリア（またはサブキャリアブロック）が重複しないように制御する方式では、以下のような問題がある。すなわち、隣接セルからの強い干渉を受ける度合いが高いのは、同一キャリア（またはサブキャリアブロック）が割り当てられた隣接セルとの境界に位置する移動局であり、それ以外の場所に位置する移動局は、干渉隣接セルから遠い場所に位置する（セル中央付近に位置する）ものであるから、干渉の度合いは低いことになる。それにもかかわらず、一律に使用するキャリア（またはサブキャリアブロック）が重複しないように制御すると、使用しても差しつかえのないキャリア（またはサブキャリアブロック）が利用できないことになり、移動通信システム全体として、周波数の利用効率の低下を招来するという問題がある。   In the method of exchanging information on the carrier (or subcarrier block) to be used between adjacent base stations as described above and controlling so that the carriers (or subcarrier blocks) to be used do not overlap each other, There is a problem like this. That is, a mobile station located at a boundary with a neighboring cell to which the same carrier (or subcarrier block) is allocated is highly susceptible to strong interference from neighboring cells, and is located elsewhere. Is located far from the adjacent cell (located near the center of the cell), and therefore the degree of interference is low. Nevertheless, if control is performed so that the carriers (or subcarrier blocks) used uniformly do not overlap, the carrier (or subcarrier block) that can be used even if used cannot be used, and the entire mobile communication system There is a problem in that the frequency utilization efficiency is reduced.

また、特許文献１の技術では、セルの境界やセルの中央付近などに予め固定的に割り当てられているグループの周波数を、移動局の位置に応じて割り当てるようになっているので、柔軟な周波数の利用ができないという問題がある。   Further, in the technique of Patent Document 1, since the frequency of a group that is fixedly allocated in advance near the cell boundary or near the center of the cell is allocated according to the position of the mobile station, the flexible frequency There is a problem that cannot be used.

本発明の目的は、隣接セル間の干渉を回避しつつ周波数利用効率を高く維持して柔軟な周波数割り当てが可能な移動通信システムを提供することである。   An object of the present invention is to provide a mobile communication system capable of flexible frequency allocation while maintaining high frequency utilization efficiency while avoiding interference between adjacent cells.

本発明による通信システムは、所定周波数帯域内の複数の周波数を、基地局が自セル内の複数の移動局に対してそれぞれ割り当てるようにした移動通信システムであって、前記基地局において、前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなす手段を含むことを特徴とする。   The communication system according to the present invention is a mobile communication system in which a base station assigns a plurality of frequencies within a predetermined frequency band to a plurality of mobile stations in its own cell, wherein the cell Means for allocating frequencies based on the position of the mobile station in the network and the frequency allocation status of adjacent base stations.

本発明による周波数割り当て方法は、所定周波数帯域内の複数の周波数を、基地局が自セル内の複数の移動局に対してそれぞれ割り当てるようにした移動通信システムにおける周波数割り当て方法であって、前記基地局において、前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなすステップを含むことを特徴とする。   A frequency allocation method according to the present invention is a frequency allocation method in a mobile communication system in which a base station allocates a plurality of frequencies in a predetermined frequency band to a plurality of mobile stations in its own cell, respectively. The station includes a step of assigning frequencies based on a position of the mobile station in the cell and a frequency assignment situation of an adjacent base station.

本発明による基地局は、所定周波数帯域内の複数の周波数を、自セル内の複数の移動局に対してそれぞれ割り当てるようにした基地局であって、前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなす手段を含むことを特徴とする。   A base station according to the present invention is a base station that assigns a plurality of frequencies within a predetermined frequency band to a plurality of mobile stations in its own cell, respectively, and the position and adjacent position of the mobile station in the cell Means for performing frequency allocation based on the frequency allocation status of the base station is included.

本発明によるプログラムは、所定周波数帯域内の複数の周波数を、自セル内の複数の移動局に対してそれぞれ割り当てるようにした基地局の動作をコンピュータにより実行させるためのプログラムであって、前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなす処理を含むことを特徴とする。   A program according to the present invention is a program for causing a computer to execute an operation of a base station in which a plurality of frequencies within a predetermined frequency band are allocated to a plurality of mobile stations in its own cell, respectively. Including a process of performing frequency allocation based on the position of the mobile station in the network and the frequency allocation status of the adjacent base station.

本発明によれば、隣接セル間の干渉の度合いが低い移動局に対しては、隣接セルと重なるキャリア（またはサブキャリアブロック）を割り当てるようにすることによって、移動通信システム全体として、周波数利用効率を高く維持することができ、また柔軟な周波数割り当てが可能になるという効果がある。   According to the present invention, a mobile station having a low degree of interference between adjacent cells is assigned a carrier (or subcarrier block) overlapping with the adjacent cell, so that the frequency utilization efficiency of the mobile communication system as a whole is increased. Can be maintained high, and flexible frequency allocation can be achieved.

以下に図面を用いて本発明の実施例について説明する。図１は本発明の一実施例の原理を説明する図である。図１において、基地局１と基地局２とはセルＣ１とセルＣ２とをそれぞれカバーしている。基地局１は隣接する基地局２との間で回線Ｌ１−２を介して情報のやりとりが可能であるものとする。移動局１１及び１２はセルＣ１内に位置しており、移動局１１は隣接セルＣ２との境界付近に位置し、移動局１２は隣接セルＣ２からは離れて位置している。そして、各移動局１１，１２には、内部に、それぞれＧＰＳ（Global Positioning System ）機能Ｇ１１，Ｇ１２が搭載されているものとする。移動局２１はセルＣ２内に位置しており、ＧＰＳ機能Ｇ２１を有している。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the principle of one embodiment of the present invention. In FIG. 1, base station 1 and base station 2 cover cell C1 and cell C2, respectively. It is assumed that the base station 1 can exchange information with the adjacent base station 2 via the line L1-2. The mobile stations 11 and 12 are located in the cell C1, the mobile station 11 is located near the boundary with the adjacent cell C2, and the mobile station 12 is located away from the adjacent cell C2. The mobile stations 11 and 12 are each equipped with GPS (Global Positioning System) functions G11 and G12, respectively. The mobile station 21 is located in the cell C2 and has a GPS function G21.

基地局１は回線Ｌ１−２を介して基地局２のキャリア（以下、キャリアはサブキャリアブロックを意味することもある）割り当て及び使用状況の情報を常に得ているものとする。移動局１１，１２は内部にＧＰＳ機能Ｇ１１，Ｇ１２をそれぞれ有しているので、移動局自身の位置情報を得ることができ、この位置情報を、通信を行っている基地局１へ伝えるようになっている。   It is assumed that the base station 1 always obtains information on allocation and usage status of the carrier of the base station 2 (hereinafter, the carrier may mean a subcarrier block) via the line L1-2. Since the mobile stations 11 and 12 have GPS functions G11 and G12 respectively, it is possible to obtain the location information of the mobile station itself, and to transmit this location information to the base station 1 that is performing communication. It has become.

基地局１では、基地局２からのキャリアの割り当て及び使用状況と、自セル配下に存在する各移動局の位置情報とに基づいて、各移動局に対して次のようにキャリアの割り当てを行う。例えば、移動局１１のように、基地局２のセルＣ２との境界付近に位置する場合には、基地局２で使用されるキャリアは回避して割り当てを行い、移動局１２のように、基地局２のセルＣ２から離れている場合には（基地局１のセルＣ１の中央付近に位置する場合には）、基地局２において使用されているキャリアであっても、割り当てを行う。こうすることにより、隣接セル間の干渉の度合いが低い移動局に対しては、隣接セルと重なるキャリアを割り当てることができるために、システム全体として、周波数の有効利用が図れるのである。   The base station 1 assigns carriers to each mobile station as follows based on the carrier assignment and usage status from the base station 2 and the location information of each mobile station existing under its own cell. . For example, when the mobile station 11 is located near the boundary with the cell C 2 of the base station 2, the carrier used in the base station 2 is avoided and assigned, and the mobile station 12 When it is away from the cell C2 of the station 2 (when it is located near the center of the cell C1 of the base station 1), even the carrier used in the base station 2 is assigned. In this way, a mobile station that has a low degree of interference between adjacent cells can be allocated with a carrier that overlaps with the adjacent cell, so that the entire system can effectively use the frequency.

図２は本発明の一実施例による基地局の機能ブロック図である。図２を参照すると、無線通信部１０１は自身のセル内に存在する移動局との通信をなすものであり、基地局間通信部１０２は隣接する基地局との通信をなすものである。移動局位置検出部１０３は自身のセル内に存在する移動局のＧＰＳ機能による位置情報を取得して、各移動局の位置検出をなすものである。キャリア割り当て部１０４は、移動局位置検出部１０３により検出された各移動局の位置に応じて、また基地局間通信部１０２により得られた隣接基地局のキャリア割り当て及び使用状況に応じて、各移動局に対するキャリア割り当てをなすものである。   FIG. 2 is a functional block diagram of a base station according to an embodiment of the present invention. Referring to FIG. 2, the wireless communication unit 101 communicates with a mobile station existing in its own cell, and the inter-base station communication unit 102 communicates with an adjacent base station. The mobile station position detection unit 103 acquires position information by the GPS function of mobile stations existing in its own cell, and detects the position of each mobile station. The carrier allocation unit 104 is configured according to the position of each mobile station detected by the mobile station position detection unit 103, and according to the carrier allocation and usage status of the adjacent base station obtained by the inter-base station communication unit 102. It is a carrier allocation for mobile stations.

制御部１０５は各部１０１〜１０４の制御を行うものであり、ＣＰＵ（コンピュータ）からなる。メモリ１０６はＣＰＵ１０５の作業用メモリであると共に、ＣＰＵの動作制御手順を予めプログラムとして格納したメモリでもある。   The control part 105 controls each part 101-104, and consists of CPU (computer). The memory 106 is a working memory for the CPU 105 and also a memory in which a CPU operation control procedure is stored in advance as a program.

図３は本発明の一実施例の動作を示すフローチャートであり、図２に示した基地局の動作フローである。図３を参照すると、隣接基地局のキャリアの割り当て及び使用状況を、基地局間通信部１０２より取得して把握する（ステップＳ１）。そして、自セル内に位置する移動局の位置を無線通信部１０１により取得して把握する（ステップＳ２）。キャリア割り当て部１０４において、隣接セルとのセル境界に位置する移動局に対しては、隣接基地局で使用されているキャリアを回避してキャリアの割り当てを行う。セル境界に位置しない移動局に対しては、隣接基地局で使用されているキャリアを割り当てる（ステップＳ５）。このキャリア割り当て状態やキャリア使用状況は、隣接基地局に対して通知されることになる（ステップＳ６）。そして、再び、ステップＳ１〜Ｓ６の動作が繰り返されるものである。   FIG. 3 is a flowchart showing the operation of the embodiment of the present invention, and is an operation flow of the base station shown in FIG. Referring to FIG. 3, the allocation and use status of carriers of adjacent base stations are acquired from the inter-base station communication unit 102 and grasped (step S1). And the position of the mobile station located in a self-cell is acquired and grasped | ascertained by the wireless communication part 101 (step S2). The carrier allocation unit 104 allocates a carrier to a mobile station located at a cell boundary with an adjacent cell while avoiding the carrier used in the adjacent base station. For a mobile station that is not located at a cell boundary, a carrier used in an adjacent base station is assigned (step S5). The carrier allocation state and carrier usage status are notified to the adjacent base station (step S6). And the operation | movement of step S1-S6 is repeated again.

本発明の他の実施例として、その基本構成は先の実施例のとおりであるが、移動局の位置情報を得る手段として、ＧＰＳ機能を用いる代りに、移動局での基地局からの下り受信信号レベルやパスタイミングを用いることもできる。図４はこの場合のシステム構成図であり、図１と同等部分は同一符号により示している。   As another embodiment of the present invention, the basic configuration is the same as the previous embodiment, but instead of using the GPS function as means for obtaining the location information of the mobile station, the mobile station receives downlink from the base station. Signal level and path timing can also be used. FIG. 4 is a system configuration diagram in this case, and parts equivalent to those in FIG. 1 are denoted by the same reference numerals.

本例においても、基地局１と基地局２とはセルＣ１とセルＣ２とをそれぞれカバーしており、基地局１は隣接基地局２との間において、回線Ｌ１−２を介して情報のやりとりが可能であり、基地局２におけるキャリア割り当て及び使用状況の情報を常に得ている。また、移動局１１及び１２はセルＣ１内に位置するが、移動局１１は隣接セルＣ２との境界付近に位置し、移動局１２は基地局１の近くに位置している。   Also in this example, the base station 1 and the base station 2 cover the cell C1 and the cell C2, respectively, and the base station 1 exchanges information with the adjacent base station 2 via the line L1-2. The base station 2 always obtains information on carrier allocation and usage status. Further, although the mobile stations 11 and 12 are located in the cell C1, the mobile station 11 is located near the boundary with the adjacent cell C2, and the mobile station 12 is located near the base station 1.

移動局１１，１２は、共に、基地局１及び基地局２から送出される下り信号のうち、一定電力で送出されるチャネルの受信信号レベルを基地局１へそれぞれ報告する。または、基地局１及び基地局２から送出される下り信号のパスタイミングの情報を基地局１にそれぞれ報告する。   Both the mobile stations 11 and 12 report to the base station 1 the received signal level of the channel transmitted at a constant power among the downlink signals transmitted from the base station 1 and the base station 2. Alternatively, the base station 1 reports the path timing information of the downlink signals transmitted from the base station 1 and the base station 2, respectively.

基地局１においては、これら各移動局からの報告によって、基地局１及び基地局２と移動局１１，１２との各距離を推定する。例えば、移動局１１からの基地局１と基地局２との受信信号レベルに基づいて、両者の差を検出し、その差が小さければ、移動局１１はセル境界付近に位置すると判断でき、逆にその差が大きければ、移動局１１はセル中央、すなわち、基地局１の近くに位置すると判断できる。下り信号のパスタイミングを用いる場合には、パスタイミングの差が小さければ、移動局はセル境界付近に位置し、その差が大きければ、基地局の近くに位置すると判断できることになる。   In the base station 1, the distances between the base stations 1 and 2 and the mobile stations 11 and 12 are estimated based on reports from these mobile stations. For example, based on the received signal levels of the base station 1 and the base station 2 from the mobile station 11, the difference between the two is detected. If the difference is small, it can be determined that the mobile station 11 is located near the cell boundary, and vice versa. If the difference is large, it can be determined that the mobile station 11 is located in the center of the cell, that is, near the base station 1. When the path timing of the downlink signal is used, it can be determined that the mobile station is located near the cell boundary if the path timing difference is small, and is located near the base station if the difference is large.

図４に示す如く、移動局１１のように、基地局２のセルＣ２との境界付近に位置する場合には、基地局２で使用されるキャリアは回避してキャリア割り当てを行い、移動局１２のように、基地局２のセルＣ２から離れている場合には、基地局２で使用されているキャリアであっても割り当てを行うことになる。   As shown in FIG. 4, when the mobile station 11 is located near the boundary with the cell C2 of the base station 2, the carrier used in the base station 2 is avoided to perform carrier allocation, and the mobile station 12 As described above, when the base station 2 is away from the cell C2, even the carrier used in the base station 2 is allocated.

上述した各実施例における基地局の動作は、その動作手順をプログラムとしてＲＯＭなどの記録媒体に格納しておき、これをコンピュータ（ＣＰＵ）により読み取らせて実行させるように構成できることは明らかである。   It is obvious that the operation of the base station in each of the embodiments described above can be configured such that the operation procedure is stored as a program in a recording medium such as a ROM, and is read and executed by a computer (CPU).

本発明の一実施例の原理を説明するためのシステム図である。It is a system diagram for demonstrating the principle of one Example of this invention. 本発明の一実施例の基地局のブロック図である。It is a block diagram of the base station of one Example of this invention. 本発明の一実施例の動作を示すフローチャートである。It is a flowchart which shows operation | movement of one Example of this invention. 本発明の他の実施例の原理を説明するためのシステム図である。It is a system diagram for demonstrating the principle of the other Example of this invention.

符号の説明Explanation of symbols

１，２ 基地局
１１，１２，２１ 移動局
１０１ 無線通信部
１０２ 基地局間通信部
１０３ 移動局位置検出部
１０４ キャリア割り当て部
１０５ 制御部（ＣＰＵ）
１０６ メモリ
Ｃ１，Ｃ２ セル
Ｇ１１，Ｇ１２，Ｇ２１ ＧＰＳ機能 1, 2 Base station 11, 12, 21 Mobile station
101 Wireless communication unit
102 Inter-base station communication section
103 Mobile station position detector
104 Carrier allocation unit
105 Control unit (CPU)
106 memory
C1, C2 cell G11, G12, G21 GPS function

Claims (14)

所定周波数帯域内の複数の周波数を、基地局が自セル内の複数の移動局に対してそれぞれ割り当てるようにした移動通信システムであって、
前記基地局において、
前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなす手段を含むことを特徴とする移動通信システム。 A mobile communication system in which a base station allocates a plurality of frequencies within a predetermined frequency band to a plurality of mobile stations in its own cell,
In the base station,
A mobile communication system comprising means for assigning frequencies based on a position of the mobile station in the cell and a frequency assignment situation of an adjacent base station. 前記手段は、前記移動局が前記隣接基地局とのセル境界付近ではない位置に位置する場合、前記隣接基地局における割り当て周波数と同一周波数を、前記移動局に割り当てることを特徴とする請求項１記載の移動通信システム。   The said means allocates the same frequency as the allocation frequency in the said adjacent base station to the said mobile station, when the said mobile station is located in the position which is not near the cell boundary with the said adjacent base station. The mobile communication system described. 前記手段は、前記移動局が前記隣接基地局とのセル境界付近に位置する場合、前記隣接基地局における割り当て周波数を回避して、前記移動局に周波数割り当てをなすことを特徴とする請求項１記載の移動通信システム。   2. The means according to claim 1, wherein when the mobile station is located in the vicinity of a cell boundary with the adjacent base station, the mobile station avoids an allocation frequency in the adjacent base station and performs frequency allocation to the mobile station. The mobile communication system described. 前記移動局の位置は、ＧＰＳ（Global Positioning System ）機能により取得されたものであることを特徴とする請求項１〜３いずれか記載の移動通信システム。   4. The mobile communication system according to claim 1, wherein the position of the mobile station is acquired by a GPS (Global Positioning System) function. 前記移動局の位置は、通信中の前記基地局及び前記隣接基地局からそれぞれ一定電力で送信される下り信号の受信信号レベルまたはパスタイミングに応じて取得されたものであることを特徴とする請求項１〜３いずれか記載の移動通信システム。   The position of the mobile station is acquired according to a received signal level or path timing of a downlink signal transmitted at a constant power from each of the base station and the adjacent base station in communication. Item 4. The mobile communication system according to any one of Items 1 to 3. 所定周波数帯域内の複数の周波数を、基地局が自セル内の複数の移動局に対してそれぞれ割り当てるようにした移動通信システムにおける周波数割り当て方法であって、
前記基地局において、
前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなすステップを含むことを特徴とする周波数割り当て方法。 A frequency allocation method in a mobile communication system in which a base station allocates a plurality of frequencies in a predetermined frequency band to a plurality of mobile stations in its own cell,
In the base station,
A frequency allocation method comprising the step of performing frequency allocation based on a position of the mobile station in the cell and a frequency allocation situation of an adjacent base station. 前記ステップは、前記移動局が前記隣接基地局とのセル境界付近ではない位置に位置する場合、前記隣接基地局における割り当て周波数と同一周波数を、前記移動局に割り当てるステップを有することを特徴とする請求項６記載の周波数割り当て方法。   The step includes a step of allocating to the mobile station the same frequency as an allocation frequency in the adjacent base station when the mobile station is located at a position that is not near a cell boundary with the adjacent base station. The frequency allocation method according to claim 6. 前記ステップは、前記移動局が前記隣接基地局とのセル境界付近に位置する場合、前記隣接基地局における割り当て周波数を回避して、前記移動局に周波数割り当てをなすステップを有することを特徴とする請求項６記載の周波数割り当て方法。   The step includes a step of allocating a frequency to the mobile station while avoiding an allocated frequency in the adjacent base station when the mobile station is located near a cell boundary with the adjacent base station. The frequency allocation method according to claim 6. 前記移動局の位置は、ＧＰＳ（Global Positioning System ）機能により取得されたものであることを特徴とする請求項６〜８いずれか記載の周波数割り当て方法。   9. The frequency allocation method according to claim 6, wherein the position of the mobile station is obtained by a GPS (Global Positioning System) function. 前記移動局の位置は、通信中の前記基地局及び前記隣接基地局からそれぞれ一定電力で送信される下り信号の受信信号レベルまたはパスタイミングに応じて取得されたものであることを特徴とする請求項６〜８いずれか記載の周波数割り当て方法。   The position of the mobile station is acquired according to a received signal level or path timing of a downlink signal transmitted at a constant power from each of the base station and the adjacent base station in communication. Item 9. A frequency allocation method according to any one of Items 6 to 8. 所定周波数帯域内の複数の周波数を、自セル内の複数の移動局に対してそれぞれ割り当てるようにした基地局であって、前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなす手段を含むことを特徴とする基地局。   A base station that allocates a plurality of frequencies in a predetermined frequency band to a plurality of mobile stations in its own cell, respectively, and determines the position of the mobile station in the cell and the frequency allocation status of adjacent base stations. A base station comprising means for making a frequency allocation based on the base station. 前記手段は、前記移動局が前記隣接基地局とのセル境界付近ではない位置に位置する場合、前記隣接基地局における割り当て周波数と同一周波数を、前記移動局に割り当てることを特徴とする請求項１１記載の基地局。   12. The means for allocating the same frequency as the frequency allocated to the adjacent base station to the mobile station when the mobile station is located at a position that is not near a cell boundary with the adjacent base station. The listed base station. 前記手段は、前記移動局が前記隣接基地局とのセル境界付近に位置する場合、前記隣接基地局における割り当て周波数を回避して、前記移動局に周波数割り当てをなすことを特徴とする請求項１１記載の基地局。   12. The means according to claim 11, wherein when the mobile station is located in the vicinity of a cell boundary with the adjacent base station, frequency allocation is made to the mobile station while avoiding an allocation frequency in the adjacent base station. The listed base station. 所定周波数帯域内の複数の周波数を、自セル内の複数の移動局に対してそれぞれ割り当てるようにした基地局の動作をコンピュータにより実行させるためのプログラムであって、前記セル内における前記移動局の位置及び隣接基地局の周波数割り当て状況に基づいて周波数割り当てをなす処理を含むことを特徴とするプログラム。   A program for causing a computer to execute an operation of a base station in which a plurality of frequencies within a predetermined frequency band are assigned to a plurality of mobile stations in its own cell, respectively. A program comprising a process of performing frequency allocation based on a position and a frequency allocation situation of an adjacent base station.
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