WO2011158501A1 - 無線通信システム、隣接セルリスト最適化システム、基地局、隣接セルリスト更新方法およびプログラム - Google Patents
無線通信システム、隣接セルリスト最適化システム、基地局、隣接セルリスト更新方法およびプログラム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- the present invention relates to a wireless communication system for updating a neighbor cell list, a neighbor cell list optimization system, a base station, a neighbor cell list update method, and a neighbor cell list update program.
- the wireless communication system includes a mobile terminal 10, a wireless base station 30, a mobile communication core network 50, and a network monitoring system 90, as shown in FIG.
- the mobile terminal 10 transmits / receives data such as communication traffic and control traffic to / from the radio base station 30.
- the radio base station 30 manages the radio cells 35 provided around the own station.
- the mobile terminal 10 exists in the radio cell 35 managed by the radio base station 30 and transmits / receives data to / from the radio base station 30.
- the network monitoring system 90 is connected to the radio base station 30 via the wired link 80 and is connected to the mobile communication core network 50 via the wired link 81 to monitor the quality of the wireless communication system, failure monitoring, configuration management, etc. I do.
- the wireless parameters of the wireless base station 30 it is required to appropriately set the wireless parameters of the wireless base station 30 in order to satisfy the required communication quality in the entire service area to be serviced.
- the radio parameters include the total transmission power of the radio base station 30, the inclination angle of the radio base station antenna in the vertical / horizontal plane, the neighbor cell list, the handover threshold, and the like.
- the neighbor cell list is set as a radio parameter in the radio base station 30.
- the neighbor cell list In a wireless communication system, service is provided by arranging wireless cells across the entire service area.
- the mobile terminal 10 moves from a connection-destination radio cell to another radio cell, the mobile terminal 10 performs a process of switching the connection-destination radio cell called handover.
- handover the expression that the mobile terminal is connected to the radio cell is used.
- the mobile terminal is connected to a radio base station that manages the radio cell.
- the handover process is specifically switching the connection destination of the mobile terminal to a radio base station that manages another radio cell.
- This handover process is specifically realized as follows. Measure the wireless quality of the connected wireless cell and the adjacent cell adjacent to the wireless cell, and if the wireless quality of the connected wireless cell deteriorates, the measured wireless quality of the wireless cell and the adjacent cell
- the mobile terminal 10 is previously set (hereinafter also referred to as an instruction) so as to transmit (hereinafter also referred to as a report) to the radio base station 30 to be managed. And it implement
- the neighbor cell list indicates candidates for handover destination radio cells.
- the neighbor cell list is generated when a communication carrier registers a radio cell for each radio cell, and is transmitted from the radio base station 30 that manages the radio cell to the mobile terminal 10 via the downlink (hereinafter also referred to as notification). )
- a radio cell registered in the adjacent cell list is referred to as a Listed Cell, and a radio cell not registered in the adjacent cell list is referred to as a Detected Cell.
- the radio base station 30 transmits the operating condition of Formula (1) to the mobile terminal 10 connected to the radio cell to be managed (hereinafter referred to as “Operating Condition”). , Also called notification).
- the mobile terminal 10 triggers that the reception power of the pilot signal transmitted by the radio base station 30 that manages the connection-destination radio cell and the adjacent base station 30 satisfies the condition of Equation (1) as a trigger.
- the measurement information of the pilot signal transmitted by the adjacent base station 30 is reported.
- the radio base station 30 that has received the measurement information report from the mobile terminal 10 generally determines the handover destination radio cell from the Listed Cells in which the radio quality is reported. Therefore, normally, the mobile terminal 10 cannot be handed over to the Detected Cell. Therefore, if there is a registration error of a wireless cell in the neighbor cell list, handover to an appropriate wireless cell cannot be performed, abnormal disconnection may occur in the middle, or communication quality may deteriorate due to handover to an inappropriate wireless cell. There is. Therefore, how to generate a neighbor cell list without registration omission becomes important in securing good communication quality.
- the setting of the neighboring cell list requires advanced technology, and optimization has been performed based on the result of a driving test in the service area of the wireless communication system.
- a neighbor cell list optimization system that autonomously optimizes a neighbor cell list during operation of a wireless communication system has been studied.
- FIG. 9 is a diagram illustrating an example of a configuration of a wireless communication system including the neighboring cell list optimization system.
- the radio communication system shown in FIG. 9 includes a mobile terminal 10, a radio base station 30, a mobile communication core network 50, a network monitoring system 90, and an adjacent cell list optimization system 95.
- the same components as those in FIG. 9 are identical to FIG. 9 in FIG. 9, the same components as those in FIG.
- the neighboring cell list optimization system 95 is connected to the network monitoring system 90 via the wired link 82 and optimizes the neighboring cell list for the wireless cell 35 managed by the wireless base station 30.
- the measurement radio 5A measures the signal strength of a pilot signal transmitted from a radio base station that manages an existing cell, and reports it to the radio base station 30A.
- the radio base station 30A measures the signal strength from the radio base station 30A with the mobile terminal 10B connected to the existing cell 35B with respect to the radio base station 30B that transmits a pilot signal whose signal strength measurement value is equal to or greater than a threshold value. , Request to report to the radio base station 30A.
- the radio base station 30A updates the adjacent cell list of the newly installed cell 35A by registering in the adjacent cell list the existing cell 35B to which the mobile terminal 10B that has measured the signal strength equal to or greater than the threshold is connected.
- Non-Patent Document 2 if there are few reports of mobile terminals connected to wireless cells that update the neighbor cell list, reliable measurement results of neighbor cells can be obtained quickly. Absent. Therefore, there is a problem that it is difficult to quickly improve deficiencies in the neighboring cell list such as omission of registration of neighboring cells.
- the neighbor cell list is updated only when the measurement radio device arranged in the new cell and the mobile terminal connected to the existing cell detect the existing cell and the new cell, respectively. . For this reason, when there are few measurement radio devices to be arranged, there is a problem in that an existing cell may be missed and an adjacent cell list is likely to be defective.
- the wireless communication system of the present invention includes a first mobile terminal group, a first base station that manages a first cell in which the first mobile terminal group exists, and a second cell adjacent to the first cell.
- the first mobile terminal group measures radio quality of the second cell and transmits measurement information of the second cell to the first base station.
- Second measurement information transmission means including measurement information transmission means, wherein the second mobile terminal group measures radio quality of the first cell and transmits measurement information of the first cell to the second base station.
- the neighbor cell list optimization system collects measurement information of the second cell from the first base station.
- An adjacent cell list optimization system is set in a first base station that manages a first cell in which a first mobile terminal group exists, and is adjacent to the first cell.
- a neighboring cell list optimization system that updates a neighboring cell list in which a particular neighboring cell that is a candidate for a handover destination of the first mobile terminal group is updated,
- the measurement information of the radio quality of the second cell transmitted from the terminal group to the first base station, and the second base station in which the second mobile terminal group existing in the second cell manages the second cell
- the measurement information collecting means for collecting the measurement information of the radio quality of the first cell, the reliability evaluation means for performing the process of evaluating the reliability of the measurement information of the second cell, and the reliability is predetermined.
- the base station manages the first cell in which the first mobile terminal group exists, is set in the own station, and a specific neighboring cell that is a handover destination candidate of the first mobile terminal group is registered.
- the neighbor cell list update method is set in the first base station that manages the first cell in which the first mobile terminal group exists, and the second mobile terminal group is adjacent to the first cell.
- the adjacent cell list optimization system 100 is realized by an information processing apparatus such as a personal computer that operates according to a program.
- the adjacent cell list optimization system 100 is not limited to a single information processing apparatus, and may be realized by a plurality of information processing apparatuses.
- Wireless coverage information is information that defines the geographical range of a wireless cell.
- the radio coverage information can generally be estimated from design information such as the transmission power of the radio base station 30 that manages the radio cell and the antenna installation angle.
- the measurement information collection unit 103 performs monitoring for all the radio base stations 30 that are monitored by the neighboring cell list optimization system 100 (hereinafter, also expressed as subordinate to the neighboring cell list optimization system 100).
- An operating condition for causing the mobile terminal 10 to report the measurement information of the neighboring cell is set.
- the operating conditions set in the radio base station 30 are notified to the mobile terminal 10 via the downlink.
- the measurement information collection unit 103 transmits information indicating operating conditions to each radio base station 30.
- the radio base station 30 sets operating conditions based on the information received from the measurement information collection unit 103 and transmits the information to the mobile terminal 10 via the downlink.
- the mobile terminal 10 sets operating conditions based on the information received from the radio base station 30.
- step S108 if it is determined in step S108 that the measurement information of the optimization target cell X is highly reliable, the priority calculation unit 104, based on the measurement information collected from the mobile terminal connected to the adjacent cell Y, The priority (R YX ) of the adjacent cell Y is calculated (step S109).
- the measurement information collection unit 103 requests radio quality measurement from all mobile terminals 10 connected to the optimization target cell.
- measurement is performed on a part of the mobile terminals 10 connected to the optimization target cell, such as requesting measurement only from the mobile terminals 10 randomly selected from the mobile terminals 10 connected to the optimization target cell. May be requested.
- the neighbor cell list optimization system 100 is adjacent to the measurement information of the neighbor cell Y collected from the radio base station 30 that manages the optimization target cell X when the reliability of the measurement information is low. Based on the measurement information collected from the radio base station 30 that manages the cell Y, the priority (R YX ) for registering the neighboring cell Y in the neighboring cell list of the optimization target cell X is calculated. Then, the neighboring cell list optimization system 100 determines whether or not to register the neighboring cell Y in the neighboring cell list based on the calculated priority (R YX ).
- the optimization target cell X when there are few mobile terminals connected to the optimization target cell X, if there are many mobile terminals connected to the adjacent cell Y, it is possible to quickly improve deficiencies in the neighboring cell list such as registration failure of neighboring cells. it can.
- the optimization target cell X when the number of measurement information reports from mobile terminals connected to increases, it can be excluded from the neighboring cell list.
- FIG. 4 shows a case where the radio cell covers the highway.
- a mobile terminal that is located inside the automobile 160 and moves with the automobile 160 performs handover in only one direction from the radio cell 35B to the radio cell 35A. Therefore, it is not necessary to register the wireless cell 35B in the adjacent cell list of the wireless cell 35A.
- the radio cell 35B may be registered in the neighboring cell list of the radio cell 35A.
- the radio cell 35B is selected from the neighboring cell list of the radio cell 35A based on the measurement information from the mobile terminal connected to the radio cell 35A. Can be excluded.
- the wireless cell 35B may be registered in the neighboring cell list of the cell 35A. However, when the number of measurement information reports from the mobile terminal connected to the radio cell 35A increases, the radio cell 35B is selected from the neighboring cell list of the radio cell 35A based on the measurement information from the mobile terminal connected to the radio cell 35A. Can be excluded.
- the priority calculation unit 104 prioritizes the neighboring cell Y regardless of the reliability of the measurement information of the neighboring cell Y collected from the radio base station 30 that manages the optimization target cell X.
- the degree (R XY ) is calculated (step S106). Thereafter, the priority calculation unit 104 shifts the processing to step S105.
- the priority calculation unit 104 calculates the priority (R XY ) calculated based on the measurement information of the neighboring cell Y collected from the radio base station 30 that manages the optimization target cell X, and the radio that manages the neighboring cell Y. Priority of registering the neighboring cell Y in the neighboring cell list of the optimization target cell X by weighted average with the priority (R YX ) calculated based on the measurement information of the optimization target cell X collected from the base station 30 ( R Y ) is calculated (step S202).
- the priority calculation unit 104 can calculate the weighted average value (R Y ) of the priority using, for example, Equation (4).
- R Y w ⁇ R XY + (1 ⁇ w) ⁇ R YX Formula (4)
- the evaluation function may be a function whose output increases in accordance with an increase in the reliability of measurement information in the range of 0 to 1, and is necessarily a function that increases linearly as the number of reports increases. There is no.
- an evaluation function such as Equation (5) may be used.
- ⁇ ( ⁇ > 1) and ⁇ ( ⁇ > 0) are constants, and t is an elapsed time after the optimization target cell is installed.
- the neighbor cell is not determined using only the measurement information of the mobile terminal connected to the radio cell whose neighbor cell list is updated.
- the reliability of the measurement information acquired from the mobile terminal connected to the wireless cell whose list is to be updated is evaluated. And when reliability is not enough, the neighboring cell registered into a neighboring cell list is determined based on the measurement information acquired from the mobile terminal connected to the neighboring cell of the radio cell which updates a neighboring cell list.
- the neighbor cell to be registered in the neighbor cell list is determined without being limited by the measurement result of the measurement radio device arranged in the radio cell whose neighbor cell list is updated. Therefore, even when there are few measurement radio devices to be arranged, there is an effect that inadequate registration errors and the like hardly occur in the generated adjacent cell list.
- the first mobile terminal group 1001 includes first measurement information transmitting means 1011 that measures the radio quality of the second cell and transmits the measurement information of the second cell to the first base station 2001.
- the second mobile terminal group 1002 includes second measurement information transmission means 1012 that measures the radio quality of the first cell and transmits the measurement information of the first cell to the second base station 2002. .
- the wireless communication system with the minimum configuration it is possible to quickly improve deficiencies in the neighboring cell list even when the measurement result of the reliable neighboring cell cannot be obtained from the mobile terminal existing in the wireless cell. Can do.
- First measurement information transmitting means for transmitting information
- the second mobile terminal group measures the radio quality of the first cell and sends the first base station to the first base station.
- 2nd measurement information transmission means for example, realized by the mobile terminal 10B executing the process according to the operation condition
- the neighboring cell list optimization system includes the first base Measurement information collection means (for example, realized by the measurement information collection unit 103) for collecting measurement information of the second cell from the station and collecting measurement information of the first cell from the second base station;
- Reliability evaluation means for example, realized by the reliability evaluation unit 106) for performing a process of evaluating the reliability of the measurement information of the first cell, and measurement information of the first cell when the reliability is equal to or less than a predetermined threshold Based on the second
- the priority calculation means for example, realized by the priority calculation unit 104) for calculating the priority for registering the second cell in the adjacent cell list of the cell and the priority calculated by the priority calculation means
- an adjacent cell list update unit for example,
- the reliability evaluation unit counts the number of receptions of the measurement information of the second cell in a predetermined counting period (for example, using the counting table shown in FIG. 3), It may be configured to perform processing for evaluating the reliability of the measurement information of the second cell on the basis thereof.
- the priority calculating unit when the reliability is equal to or lower than a predetermined threshold, the priority calculating unit totals the number of receptions of the measurement information of the first cell in a predetermined total period, and based on the total reception It may be configured to calculate the priority of the second cell.
- the first measurement information transmission unit transmits the second cell measurement information to the first base station when the measured wireless quality exceeds a predetermined quality threshold.
- the second measurement information transmission means transmits the measurement information of the first cell to the second base station when the measured radio quality exceeds a predetermined quality threshold,
- the measurement information collecting means sets a predetermined quality threshold value lower than the handover threshold value for the second base station so that the measurement information of the first cell increases when the reliability is equal to or lower than the predetermined threshold value. You may be comprised so that it may set to.
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Abstract
Description
ThHO=Os-Ot 数式(2)
以下に、本発明を実施するための形態を図面を参照して説明する。なお、以下では、図9に示す無線通信システムにおいて、本発明による隣接セルリスト最適化システムが、無線基地局30に設定された隣接セルリストを更新する例について記載する。そのため、図9と同様の構成については同じ符号を付し、説明を省略する。
RYX=nYX/Σi(niX) 数式(3)
本実施形態の隣接セルリスト最適化システム200は、第1の実施形態と比較して、次の点で異なる。本実施形態では、最適化対象セルを管理する無線基地局30から収集した測定情報に基づいて算出した優先度と、最適化対象セルの隣接セルを管理する無線基地局30から収集した測定情報に基づいて算出した優先度との加重平均により、最適化対象セルの隣接セルリストに隣接セルを登録する優先度を算出する。
10 移動端末
30 無線基地局
50 移動通信コア網
70 外部網
90 ネットワーク監視システム
95,100,200,3000 隣接セルリスト最適化システム
101 測定情報記憶部
102 設計情報記憶部
103 測定情報収集部
104 優先度算出部
105 隣接セルリスト更新部
106 信頼度評価部
160 自動車
1001 第1の移動端末群
1011 第1の測定情報送信手段
1002 第2の移動端末群
1012 第2の測定情報送信手段
2001 第1の基地局
2002 第2の基地局
3001 測定情報収集手段
3002 信頼度評価手段
3003 優先度算出手段
3004 隣接セルリスト更新手段
Claims (10)
- 第1の移動端末群と、
前記第1の移動端末群が存在する第1のセルを管理する第1の基地局と、
前記第1のセルに隣接する第2のセルに存在する第2の移動端末群と、
前記第2のセルを管理する第2の基地局と、
前記第1の移動端末群のハンドオーバ先の候補となる特定の隣接セルを登録した隣接セルリストを管理する隣接セルリスト最適化システムとを備え、
前記第1の移動端末群は、前記第2のセルの無線品質を測定して、前記第1の基地局に前記第2のセルの測定情報を送信する第1の測定情報送信手段を含み、
前記第2の移動端末群は、前記第1のセルの無線品質を測定して、前記第2の基地局に前記第1のセルの測定情報を送信する第2の測定情報送信手段を含み、
前記隣接セルリスト最適化システムは、
前記第1の基地局から前記第2のセルの測定情報を収集し、前記第2の基地局から前記第1のセルの測定情報を収集する測定情報収集手段と、
前記第2のセルの測定情報の信頼度を評価する処理を行う信頼度評価手段と、
前記信頼度が所定の閾値以下のとき、前記第1のセルの測定情報に基づいて、前記第1のセルの隣接セルリストに前記第2のセルを登録する優先度を算出する優先度算出手段と、
前記優先度算出手段が算出した優先度に基づいて、前記隣接セルリストに登録する隣接セルを決定し、前記隣接セルリストを更新する制御を行う隣接セルリスト更新手段とを
含むことを特徴とする無線通信システム。 - 信頼度評価手段は、所定の集計期間において第2のセルの測定情報の受信数を集計し、集計した受信数に基づいて前記第2のセルの測定情報の信頼度を評価する処理を行う
請求項1記載の無線通信システム。 - 優先度算出手段は、信頼度が所定の閾値以下のとき、所定の集計期間において第1のセルの測定情報の受信数を集計し、集計した受信数に基づいて第2のセルの優先度を算出する
請求項1または請求項2記載の無線通信システム。 - 優先度算出手段は、信頼度が所定の閾値以下のとき、第1のセルの測定情報の受信数に基づき算出した第1の優先度と、所定の集計期間において第2のセルの測定情報の受信数を集計し、集計した受信数に基づき算出した第2の優先度とを加重平均し、該第2の優先度の加重平均値に基づいて前記第2のセルの優先度を算出する
請求項3記載の無線通信システム。 - 優先度算出手段は、第2のセルの測定情報の信頼度に基づいて加重平均の加重係数を決定する
請求項4記載の無線通信システム。 - 優先度算出手段は、第1のセルが設置された後の経過時間に基づいて加重平均の加重係数を決定する
請求項4記載の無線通信システム。 - 第1の移動端末群が存在する第1のセルを管理する第1の基地局に設定され、前記第1のセルに隣接して第2の移動端末群が存在する第2のセルのうち、前記第1の移動端末群のハンドオーバ先の候補となる特定の隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムであって、
前記第1の移動端末群が前記第1の基地局に送信した、前記第2のセルの無線品質の測定情報と、前記第2のセルに存在する前記第2の移動端末群が前記第2のセルを管理する第2の基地局に送信した、前記第1のセルの無線品質の測定情報とを収集する測定情報収集手段と、
前記第2のセルの測定情報の信頼度を評価する処理を行う信頼度評価手段と、
前記信頼度が所定の閾値以下のとき、前記第1のセルの測定情報に基づいて、前記第1のセルの隣接セルリストに前記第2のセルを登録する優先度を算出する優先度算出手段と、
前記優先度算出手段が算出した優先度に基づいて、前記隣接セルリストに登録する隣接セルを決定し、前記隣接セルリストを更新する制御を行う隣接セルリスト更新手段とを
含むことを特徴とする隣接セルリスト最適化システム。 - 第1の移動端末群が存在する第1のセルを管理し、自局に設定され、前記第1の移動端末群のハンドオーバ先の候補となる特定の隣接セルが登録された隣接セルリストを更新する第1の基地局であって、
前記第1のセルに隣接して第2の移動端末群が存在する第2のセルを管理する第2の基地局に接続し、前記第1の移動端末群が当該基地局に送信した、前記第2のセルの無線品質の測定情報と、前記第2の移動端末群が前記第2の基地局に送信した、前記第1のセルの無線品質の測定情報とを収集する測定情報収集手段と、
前記第2のセルの測定情報の信頼度を評価する処理を行う信頼度評価手段と、
前記信頼度が所定の閾値以下のとき、前記第1のセルの測定情報に基づいて、前記第1のセルの隣接セルリストに前記第2のセルを登録する優先度を算出する優先度算出手段と、
前記優先度算出手段が算出した優先度に基づいて、前記隣接セルリストに登録する隣接セルを決定し、前記隣接セルリストを更新する制御を行う隣接セルリスト更新手段とを
備えたことを特徴とする基地局。 - 第1の移動端末群が存在する第1のセルを管理する第1の基地局に設定され、前記第1のセルに隣接して第2の移動端末群が存在する第2のセルのうち、前記第1の移動端末群のハンドオーバ先の候補となる特定の隣接セルを登録した隣接セルリストを更新する隣接セルリスト更新方法であって、
前記第1の移動端末群が前記第1の基地局に送信した、前記第2のセルの無線品質の測定情報と、前記第2のセルに存在する前記第2の移動端末群が前記第2のセルを管理する第2の基地局に送信した、前記第1のセルの無線品質の測定情報とを収集し、
収集した前記第2のセルの測定情報の信頼度を評価する処理を行い、
評価した前記信頼度が所定の閾値以下のとき、前記第1のセルの測定情報に基づいて、前記第1のセルの隣接セルリストに前記第2のセルを登録する優先度を算出し、
算出した優先度に基づいて、前記隣接セルリストに登録する隣接セルを決定し、前記隣接セルリストを更新する制御を行う
ことを特徴とする隣接セルリスト更新方法。 - 第1の移動端末群が存在する第1のセルを管理する第1の基地局に設定され、前記第1のセルに隣接して第2の移動端末群が存在する第2のセルのうち、前記第1の移動端末群のハンドオーバ先の候補となる特定の隣接セルを登録した隣接セルリストを更新させるための隣接セルリスト更新プログラムであって、
コンピュータに、
前記第1の移動端末群が前記第1の基地局に送信した、前記第2のセルの無線品質の測定情報と、前記第2のセルに存在する前記第2の移動端末群が前記第2のセルを管理する第2の基地局に送信した、前記第1のセルの無線品質の測定情報とを収集する測定情報収集処理と、
収集した前記第2のセルの測定情報の信頼度を評価する処理を行う信頼度評価処理と、
評価した前記信頼度が所定の閾値以下のとき、前記第1のセルの測定情報に基づいて、前記第1のセルの隣接セルリストに前記第2のセルを登録する優先度を算出する優先度算出処理と、
算出した優先度に基づいて、前記隣接セルリストに登録する隣接セルを決定し、前記隣接セルリストを更新する制御を行う隣接セルリスト更新処理とを
実行させるための隣接セルリスト更新プログラム。
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