JP2020022029A - Radio communication system and radio communication method - Google Patents

Radio communication system and radio communication method Download PDF

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JP2020022029A
JP2020022029A JP2018143301A JP2018143301A JP2020022029A JP 2020022029 A JP2020022029 A JP 2020022029A JP 2018143301 A JP2018143301 A JP 2018143301A JP 2018143301 A JP2018143301 A JP 2018143301A JP 2020022029 A JP2020022029 A JP 2020022029A
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base station
mobile station
wireless communication
station
communication system
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JP7237485B2 (en
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林　直樹
Naoki Hayashi
直樹 林
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Hitachi Kokusai Electric Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

To solve the problem in which a lot of power consumption is wasted in a radio system in which a plurality of base stations transmit the same frequency at the same timing because base stations that do not need to transmit also transmit signals.SOLUTION: A command facility of a radio communication system receives positional information from a mobile station, obtains a moving direction of the mobile station on the basis of the positional information, determines a moving destination base station of the mobile station on the basis of the moving direction of the mobile station and positional information on the base station, and notifies a line control device of the moving destination base station. The line control device grants a transmission right to the notified base station. When the transmission right is granted, the base station transmits a signal to the mobile station.SELECTED DRAWING: Figure 1

Description

本発明は無線通信システムおよび無線通信方法に関する。   The present invention relates to a wireless communication system and a wireless communication method.

移動局が無線周波数の異なる複数の基地局と通信を行う無線通信システムでは、周波数の切替え時（ハンドオフ）に通話の途切れが発生する。通話の途切れを削減するため、基地局間で同期し、各基地局が同一のタイミングで同一の周波数の信号を送出する無線通信システムがある（例えば、特許文献１）。   In a wireless communication system in which a mobile station communicates with a plurality of base stations having different radio frequencies, a call is interrupted when switching frequencies (handoff). There is a wireless communication system in which base stations synchronize and transmit signals of the same frequency at the same timing in order to reduce the interruption of a call (for example, Patent Document 1).

特開２０１５−１４４４０８号公報JP 2015-144408 A

基地局間同期機能を具備し、複数基地局から同一タイミングで同一周波数信号を送出する無線通信システムでは、全ての基地局が信号を送出するため、一つの基地局のみが送出する無線通信システムと比較して、消費電力が大きい。
本発明の課題は、消費電力の低減が可能な無線通信システムを提供することにある。 In a wireless communication system having an inter-base station synchronization function and transmitting the same frequency signal from a plurality of base stations at the same timing, since all base stations transmit signals, a wireless communication system in which only one base station transmits is used. The power consumption is large in comparison.
An object of the present invention is to provide a wireless communication system capable of reducing power consumption.

本発明のうち代表的なものの概要を簡単に説明すれば下記の通りである。
すなわち、予め設定された各基地局のエリアと移動局から取得した位置情報に基づいて、信号の送出が必要な基地局を判定し、当該基地局のみに送信権を与える。その結果、全ての基地局では無く、送信権を付与された基地局のみから、信号を送出する。 The outline of a typical one of the present invention is briefly described as follows.
That is, based on the preset area of each base station and the location information acquired from the mobile station, the base station that needs to transmit a signal is determined, and the transmission right is given only to the base station. As a result, a signal is transmitted not from all the base stations but only from the base station to which the transmission right has been granted.

上記無線通信システムによれば、消費電力の削減が可能となる。   According to the above wireless communication system, power consumption can be reduced.

実施例の無線通信システムの概略構成の例を示す図である。FIG. 1 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. 図１の無線通信システムの動作シーケンスの例を示す図である。FIG. 2 is a diagram illustrating an example of an operation sequence of the wireless communication system in FIG. 1.

実施形態の無線通信システムは基地局間同期機能を具備し、複数基地局から同一タイミングで同一周波数信号を送出する。無線通信システムは「予め設定された各基地局のエリア」と「移動局から取得した位置情報」とに基づいて、送出が必要な基地局のみに送信権を与える。各基地局のエリア情報と移動局の位置情報に基づいて、信号送出が必要な基地局を判断することで、不要な基地局からは信号を送出せず、その分の消費電力を削減することができる。   The wireless communication system according to the embodiment has a synchronization function between base stations, and transmits the same frequency signal from a plurality of base stations at the same timing. The wireless communication system gives a transmission right only to base stations that need to be transmitted, based on “a preset area of each base station” and “location information acquired from a mobile station”. Based on the area information of each base station and the location information of the mobile station, the base station that needs signal transmission is determined, so that signals are not transmitted from unnecessary base stations and the power consumption is reduced accordingly. Can be.

より具体的には、無線通信システムは移動局から位置情報を受信することで、移動局の位置と移動方向（時間軸上の緯度経度）を求め、移動局の位置・移動方向と基地局の位置情報（予め設定された各基地局のエリア）とに基づいて、（Ａ）移動局が現時点で傘下にある基地局、（Ｂ）移動局が次（一定時間後）に傘下となる基地局、（Ｃ）現時点にも一定時間後にも傘下とならない基地局を判定し、基地局（Ａ）及び（Ｂ）に送信権を付与する。なお、移動局が移動しないと判断した場合は、基地局（Ｂ）に送信権を付与しなくてもよい。   More specifically, the wireless communication system obtains the position and moving direction (latitude and longitude on the time axis) of the mobile station by receiving the position information from the mobile station, and calculates the position and moving direction of the mobile station and the base station. Based on the location information (preset area of each base station), (A) the base station that the mobile station is currently serving, and (B) the base station that the mobile station will be serving next (after a certain time). , (C) determine a base station that does not become an affiliation even at the present time or after a certain time, and grant a transmission right to the base stations (A) and (B). When it is determined that the mobile station does not move, the transmission right may not be given to the base station (B).

以下、実施例について図１、２を用いて説明する。図１は実施例の無線通信システムの概略構成の例を示す図である。   Hereinafter, an embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.

実施例の無線通信システム１は、指令設備１０、回線制御装置２０、基地局３０、移動局４０等の装置や設備を有している。無線通信システム１は基地局間同期機能を具備し、複数の基地局から同一タイミングで同一周波数信号を送出する。   The wireless communication system 1 according to the embodiment includes devices and facilities such as a command facility 10, a line control device 20, a base station 30, and a mobile station 40. The wireless communication system 1 has a synchronization function between base stations, and transmits the same frequency signal from a plurality of base stations at the same timing.

指令設備１０は、指令センターに設置され、回線制御装置２０に接続されて、無線通信システム１を操作するための装置であり、音声の入出力、データ（画像、移動局の位置を示す情報等の非音声情報）等の入力、処理、表示等を行う。指令設備１０には、各基地局３０がカバーしているエリア（サービスエリア）が、予め設定されている。指令設備１０は、移動局４０から得た位置情報と各基地局３０がカバーしているエリアとから、移動局４０と通話するために送信が必要な基地局３０を決定し、送信が必要な基地局３０を回線制御装置２０に通知する。   The command facility 10 is installed at a command center, is connected to the line control device 20, and is a device for operating the wireless communication system 1. The command facility 10 includes voice input / output, data (image, information indicating the position of the mobile station, etc.). Input, processing, display, and the like. In the command facility 10, an area (service area) covered by each base station 30 is set in advance. The command facility 10 determines the base station 30 that needs to be transmitted to communicate with the mobile station 40 from the location information obtained from the mobile station 40 and the area covered by each base station 30, The base station 30 is notified to the line controller 20.

回線制御装置２０には、上述したように、指令設備１０が接続されている。また、回線制御装置２０には、その管理下にある複数の基地局３０が接続されている。本実施例では、回線制御装置２０に、移動局４０との無線通信を行う五つの基地局３０（＃１）〜（＃５）が接続されており、これら基地局３０の制御を行う。基地局３０の数は五つに限定されるものではなく、無線通信システムの空間的大きさと基地局間距離に基づいて設定される。   The command equipment 10 is connected to the line control device 20 as described above. A plurality of base stations 30 under the management are connected to the line control device 20. In the present embodiment, five base stations 30 (# 1) to (# 5) that perform wireless communication with the mobile station 40 are connected to the line control device 20, and control these base stations 30. The number of base stations 30 is not limited to five, and is set based on the spatial size of the wireless communication system and the distance between base stations.

回線制御装置２０は、基地局３０を介し移動局４０の位置情報を定期的に収集し、収集した情報を指令設備１０へ受け渡し、指令設備１０の決定に応じ、基地局３０の送信許可・非許可を指示する。例えば、送信許可のフラグを立たせた情報を基地局３０へ送信することで、基地局３０に送信権を付与する。また、送信許可のフラグを外した情報を基地局３０へ送信することで、基地局３０に付与された送信権を解除する。送信権は、送信権が付与された時刻や基地局が信号を送信した時刻から所定の時間が経過した場合、解除されてもよい。なお、回線制御装置２０は、ＣＰＵ（Central Processing Unit）を備えた制御部（不図示）と、基地局インタフェース部（不図示）と、を有している。また、基地局３０は、ＣＰＵを備えた制御部（不図示）と、無線部（不図示）と、無線アンテナ３１と、を有している。   The line control device 20 periodically collects the position information of the mobile station 40 via the base station 30, passes the collected information to the command facility 10, and permits or disables transmission of the base station 30 according to the decision of the command facility 10. Indicate permission. For example, the transmission right is given to the base station 30 by transmitting the information with the transmission permission flag set to the base station 30. Further, by transmitting the information with the transmission permission flag removed to the base station 30, the transmission right granted to the base station 30 is released. The transmission right may be released when a predetermined time has elapsed from the time at which the transmission right was granted or the time at which the base station transmitted the signal. The line control device 20 includes a control unit (not shown) including a CPU (Central Processing Unit) and a base station interface unit (not shown). Further, the base station 30 has a control unit (not shown) including a CPU, a wireless unit (not shown), and a wireless antenna 31.

基地局３０は、自局のサービスエリア（図１の破線）内に存在する移動局４０と無線通信する。このとき、回線制御装置２０から送信された送信権に基づいて、信号を送信するか否かを判断する。つまり、送信権を付与された基地局３０のみ信号を送信する。   The base station 30 wirelessly communicates with a mobile station 40 existing within its own service area (broken line in FIG. 1). At this time, it is determined whether to transmit a signal based on the transmission right transmitted from the line control device 20. That is, only the base station 30 to which the transmission right has been given transmits a signal.

移動局４０は、車載や携帯により移動自在な無線通信端末であり、その所在位置をサービスエリアに含む基地局３０と無線通信を行う。移動局４０は、ＧＰＳアンテナ（不図示）と、ＧＰＳモジュール（不図示）と、ＣＰＵを備えた制御部（不図示）と、無線部（不図示）と、無線アンテナ４１と、を有している。移動局４０は、ＧＰＳモジュールから位置情報を取得し、基地局３０を介した回線制御装置２０からの要求に応じ、自局の位置情報を定期的に基地局３０へ送信する。移動局４０は、電源ON時にも位置情報を送信する。   The mobile station 40 is a wireless communication terminal that is movable on a vehicle or on a mobile phone, and performs wireless communication with the base station 30 whose location is included in a service area. The mobile station 40 includes a GPS antenna (not shown), a GPS module (not shown), a control unit (not shown) including a CPU, a wireless unit (not shown), and a wireless antenna 41. I have. The mobile station 40 acquires position information from the GPS module, and periodically transmits its own position information to the base station 30 in response to a request from the line controller 20 via the base station 30. The mobile station 40 also transmits position information when the power is turned on.

指令設備１０は、移動局４０の位置情報と、各基地局３０がカバーしているエリアに基づいて、送信権を付与する基地局３０を判断する。図１では、移動局４０は、基地局３０（＃１）、３０（＃２）のエリアに存在している。このとき、指令設備１０は、全基地局ではなく、現在移動局がエリアに存在している基地局３０（＃１）、３０（＃２）のみからの信号送出が必要と判断することができる。また、移動局４０の位置情報を定期的に収集している場合、その微分から移動局４０の移動方向と移動速度を算出し、場合によっては移動先の基地局（図１の例では基地局３０（＃３））も送出が必要と判断することも可能である。つまり、移動局４０の位置が基地局３０（＃３）の位置に近づいている場合、基地局（＃３）を移動先の基地局と判断する。なお、高速道路のような移動局４０が一定方向にしか進まない状況での無線通信システムは、基地局３０が高速道路に沿って配置されているため、次に移動局４０が傘下に入る基地局３０が確定している。よって、回線制御装置２０が送信権を付与する基地局３０は、移動局４０が傘下にいる基地局３０と移動局４０の移動先の基地局３０とし、距離は近くても移動方向に無い基地局３０には送信権を付与しない。また、例えば渋滞時などで移動局４０の移動速度が小さい（所定の閾値より小さい）場合は、移動先の基地局３０に送信権を付与しなくてもよい。すなわち、移動局４０の移動速度４０が、所定の閾値より大きい場合、移動先の基地局３０に送信権を付与する。これらにより、本システムは、移動局４０の移動先の基地局３０を予測し、移動局４０が傘下にいる基地局３０及び予測した基地局３０のみ送信権を付与する。これにより、距離が近い基地局３０だけ送信権を付与する方法よりも、システムの消費電力を更に抑えることができる。なお、回線制御装置２０が、送信権を付与する基地局を判定してもよい。   The command facility 10 determines the base station 30 to which the transmission right is to be given based on the location information of the mobile station 40 and the area covered by each base station 30. In FIG. 1, the mobile station 40 exists in the area of the base stations 30 (# 1) and 30 (# 2). At this time, the command facility 10 can determine that signal transmission is required only from the base stations 30 (# 1) and 30 (# 2) in which the mobile station currently exists in the area, not all base stations. . When the position information of the mobile station 40 is periodically collected, the moving direction and the moving speed of the mobile station 40 are calculated from the differentiation, and in some cases, the destination base station (the base station in the example of FIG. 1) 30 (# 3)) can also be determined to be necessary. That is, when the position of the mobile station 40 is approaching the position of the base station 30 (# 3), the base station (# 3) is determined to be the destination base station. In a wireless communication system in a situation where the mobile station 40 travels only in a certain direction, such as on an expressway, the base station 30 is arranged along the expressway. The station 30 has been determined. Therefore, the base station 30 to which the line control device 20 grants the transmission right is the base station 30 to which the mobile station 40 belongs and the base station 30 to which the mobile station 40 moves, and the base station 30 which is short in the moving direction even if the distance is short. The station 30 is not given a transmission right. When the moving speed of the mobile station 40 is low (e.g., smaller than a predetermined threshold) due to, for example, traffic congestion, the transmission right may not be given to the destination base station 30. That is, when the moving speed 40 of the mobile station 40 is higher than the predetermined threshold, the transmission right is given to the destination base station 30. Accordingly, the present system predicts the base station 30 to which the mobile station 40 moves, and grants the transmission right only to the base station 30 that the mobile station 40 is affiliated with and the predicted base station 30. As a result, the power consumption of the system can be further reduced as compared with the method of granting the transmission right only to the base station 30 that is short in distance. Note that the line control device 20 may determine the base station to which the transmission right is assigned.

次に、無線通信システム１の動作の流れについて図２を用いて説明する。図２は図１の無線通信システムの動作シーケンスを示す図である。   Next, an operation flow of the wireless communication system 1 will be described with reference to FIG. FIG. 2 is a diagram showing an operation sequence of the wireless communication system of FIG.

先ず、ユーザから指令設備１０に対し、各基地局３０がカバーするエリアを情報として持たせ予め認識させる（ステップＳ１）。また、システム運用時は、移動局４０は自局の位置情報をＧＰＳより取得し、定期的に基地局３０を介し回線制御装置２０および指令設備１０に位置情報および移動局４０のＩＤ情報を送信する（ステップＳ２）。   First, the user causes the command facility 10 to have information covered by the area covered by each base station 30 and recognize the information in advance (step S1). During system operation, the mobile station 40 acquires its own location information from the GPS, and periodically transmits the location information and the ID information of the mobile station 40 to the line controller 20 and the command equipment 10 via the base station 30. (Step S2).

実際にユーザから移動局４０との通話操作（ステップＳ３）が入った場合には、指令設備１０が「予め設定された各基地局のエリア」と「移動局の位置情報」とに基づいて、信号送出が必要な基地局３０を判断し、指令設備１０がその判断を回線制御装置２０に通知する（ステップＳ４）。   When a call operation with the mobile station 40 is actually performed by the user (step S3), the command facility 10 sets the command area 10 based on the “predetermined area of each base station” and the “position information of the mobile station”. The base station 30 that requires signal transmission is determined, and the command facility 10 notifies the line controller 20 of the determination (step S4).

次に、回線制御装置２０は送信が必要な基地局３０のみに送信権を付与したうえで送信動作を指示する（ステップＳ５）。ここでは送信が必要な基地局３０を「Ａ基地局」、不要な基地局３０を「Ｂ基地局」としている。Ａ基地局は送信動作に入り、結果として移動局４０との通話を実現する（ステップＳ６）。一方、Ｂ基地局は送信動作をとらない。これにより、全ての基地局からではなく、必要な基地局のみから信号を送出し、送信が不要な基地局３０（この例でのＢ基地局）の分だけ、消費電力を低減することができる。なお、送信が不要な基地局３０は受信待ちの状態にある。   Next, the line control device 20 gives a transmission right only to the base station 30 that requires transmission, and instructs a transmission operation (step S5). Here, the base station 30 requiring transmission is referred to as “A base station”, and the unnecessary base station 30 is referred to as “B base station”. The A base station starts the transmission operation, and as a result, realizes a call with the mobile station 40 (step S6). On the other hand, the B base station does not perform the transmission operation. As a result, signals can be transmitted only from necessary base stations, not from all base stations, and power consumption can be reduced by the base station 30 (B base station in this example) that does not need to transmit. . The base station 30 that does not need to transmit is waiting for reception.

以上、本発明者によってなされた発明を実施形態および実施例に基づき具体的に説明したが、本発明は、上記実施形態および実施例に限定されるものではなく、種々変更可能であることはいうまでもない。   As described above, the invention made by the inventor has been specifically described based on the embodiment and the example. However, the present invention is not limited to the above embodiment and the example, and it can be variously modified. Not even.

１・・・無線通信システム
１０・・・指令設備
２０・・・回線制御装置
３０・・・基地局
４０・・・移動局 DESCRIPTION OF SYMBOLS 1 ... Wireless communication system 10 ... Command equipment 20 ... Line controller 30 ... Base station 40 ... Mobile station

Claims (6)

移動局と、前記移動局へ信号を送出する複数の基地局と、前記基地局に接続された回線制御装置と、前記回線制御装置に接続された指令設備と、をそなえた無線通信システムであって、
前記指令設備は、前記移動局から位置情報を受信し、前記位置情報に基づいて前記移動局の移動方向を求め、前記移動局の前記移動方向および前記基地局の位置情報に基づいて、前記移動局の移動先の基地局を判定し、前記移動先の基地局を前記回線制御装置に通知し、
前記回線制御装置は、通知された基地局に送信権を付与し、
前記基地局は、送信権が付与された場合、信号を前記移動局へ送出する無線通信システム。 A wireless communication system comprising a mobile station, a plurality of base stations for transmitting signals to the mobile station, a line controller connected to the base station, and a command facility connected to the line controller. hand,
The command facility receives position information from the mobile station, determines a movement direction of the mobile station based on the position information, and performs the movement based on the movement direction of the mobile station and position information of the base station. Determine the destination base station of the station, notify the destination base station to the line control device,
The line control device grants a transmission right to the notified base station,
A wireless communication system, wherein the base station sends a signal to the mobile station when a transmission right is granted. 請求項１の無線通信システムにおいて、
前記指令設備は、前記移動局が近づいている基地局を移動先の基地局と判定する
無線通信システム。 The wireless communication system according to claim 1,
The wireless communication system, wherein the command facility determines a base station approaching the mobile station as a destination base station. 請求項１または請求項２の無線通信システムにおいて、
前記指令設備は、前記移動局の位置情報に基づいて、前記移動局の移動速度を求め、当該移動速度が所定の閾値より大きい場合、移動先の基地局に送信権を付与する無線通信システム。 In the wireless communication system according to claim 1 or 2,
The wireless communication system, wherein the command facility obtains a moving speed of the mobile station based on position information of the mobile station, and if the moving speed is higher than a predetermined threshold, grants a transmission right to a destination base station. 基地局から移動局へ信号を送出する無線通信方法であって、
移動局の位置情報に基づいて、前記移動局の移動方向を求めるステップと、前記移動局の前記移動方向および前記基地局の位置情報に基づいて、前記移動局の移動先の基地局を判定するステップと、移動先の基地局と判定した基地局に送信権を付与するステップと、送信権を付与された基地局から信号を送出するステップと、を含む無線通信方法。 A wireless communication method for transmitting a signal from a base station to a mobile station,
Determining a moving direction of the mobile station based on position information of the mobile station; and determining a destination base station of the mobile station based on the moving direction of the mobile station and position information of the base station. A wireless communication method, comprising the steps of: giving a transmission right to a base station determined to be a destination base station; and transmitting a signal from the base station to which the transmission right has been given. 請求項４の無線通信方法において、
前記移動局の移動方向および前記基地局の位置情報に基づいて、前記移動局が近づいている基地局を前記移動局の移動先の基地局と判定するステップを含む無線通信方法。 The wireless communication method according to claim 4,
A wireless communication method including a step of determining a base station approaching the mobile station as a destination base station of the mobile station based on the moving direction of the mobile station and position information of the base station. 請求項４または請求項５の無線通信方法において、
前記移動局の位置情報に基づいて、前記移動局の移動速度を求めるステップと、当該移動速度が所定の閾値より大きい場合、移動先の基地局に送信権を付与するステップと、を含む無線通信方法。 In the wireless communication method according to claim 4 or 5,
Wireless communication comprising: obtaining a moving speed of the mobile station based on position information of the mobile station; and, if the moving speed is higher than a predetermined threshold, granting a transmission right to a destination base station. Method.
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