JPH02126738A - Base station selecting system and mobile terminal for mobile radio communication system - Google Patents
Base station selecting system and mobile terminal for mobile radio communication systemInfo
- Publication number
- JPH02126738A JPH02126738A JP63281920A JP28192088A JPH02126738A JP H02126738 A JPH02126738 A JP H02126738A JP 63281920 A JP63281920 A JP 63281920A JP 28192088 A JP28192088 A JP 28192088A JP H02126738 A JPH02126738 A JP H02126738A
- Authority
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- Japan
- Prior art keywords
- base station
- mobile terminal
- propagation loss
- transmission power
- communication system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000004891 communication Methods 0.000 title description 2
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 40
- 238000010295 mobile communication Methods 0.000 claims description 19
- 238000010187 selection method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- RCJVRSBWZCNNQT-UHFFFAOYSA-N dichloridooxygen Chemical compound ClOCl RCJVRSBWZCNNQT-UHFFFAOYSA-N 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- 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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- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野：
本発明は移動通信システムの基地局選択方式および移動
端末に関し、特に小ゾーン方式（セルラ方式）の移動通
信システムの基地局選択方式および移動端末に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a base station selection method and a mobile terminal for a mobile communication system, and particularly to a base station selection method and a mobile terminal for a small zone type (cellular type) mobile communication system. Regarding.
従来の一般的な移動通信システムの基地局選択方式は、
移動端末が基地局を選択する場合、単純に、電波を最も
強い電界強度で受信した基地局を選択する方式であった
。（９考文献ゼット・シー・フラー（ｚ、Ｃ，Ｆｌｕｂ
ｒ）著、［アドバンストモーバイル・フォーン・サービ
ス・コントロール・アーキテクチャＪ （Ａｄｖａｎ
ｃｅｄ Ｍｏｂｉｌｅ ＰｈｏｎｅＳｅｒｖｉｃｅ：Ｃ
ｏｎｔｒｏｌ＾ｒｃｈｉｔｅｃｔｕｒｅ） 、ベル・シ
ステム・テクニカル・ジ六・−ナル（Ｔｈｅ Ｂｅ１ｌ
ＳｙｓｔｅｍＴｅｃｈｎｉｃａｌ Ｊｏｕｒｎａｌ）
、１９７９年、１月１６２〜６３頁）
そして最近、自動車電話システムのような小ゾーン方式
の移動無線システムの新たな動向として、加入者が持ち
運び可能な携帯端末に対する需要が高まっている。この
ような携帯端末は、小型、軽量化が強く要求されるため
、バッテリもさほど大きくすることができない、つまり
移動通信システムに携帯端末を収容する場合の重要な課
題は、バッテリセービング技術である。特に有効なバッ
テリセービング技術として、携帯端末の送信電力を、伝
搬損失に応じて制御することにより、通話を行うのに必
要最小限のレベルに保つ送信電力制御方式が良く知られ
ている。この技術を自動車電話システムに応用し、例え
ば、移動端末が基地局から離れていたり、建物や山の影
になったりして伝搬損失が大きな場合には送信電力のレ
ベルを上げるが、移動端末が基地局に近付いたり、建物
や山の影から出たりして伝搬損失が小さくなると送信電
力のレベルを下げてバッテリのセーブを行うことが考え
られる。The conventional base station selection method for general mobile communication systems is
When a mobile terminal selects a base station, it simply selects the base station that receives radio waves with the strongest field strength. (9 bibliography Z C Fuller (z, C, Flub
r), [Advanced Mobile Phone Service Control Architecture J (Advanced
ced Mobile Phone Service:C
ontrol^rchitecture), Bell System Technical District (The Be1l
System Technical Journal)
(January 1979, pp. 162-63) Recently, as a new trend in small zone mobile radio systems such as car telephone systems, there has been an increasing demand for portable terminals that can be carried by subscribers. Since such mobile terminals are strongly required to be small and lightweight, the battery cannot be made very large. That is, an important issue when accommodating mobile terminals in a mobile communication system is battery saving technology. As a particularly effective battery saving technique, a transmission power control method is well known in which the transmission power of a mobile terminal is controlled according to propagation loss to maintain it at the minimum level necessary for making a phone call. Applying this technology to a car phone system, for example, if the mobile terminal is far from the base station or is behind a building or mountain and the propagation loss is large, the transmission power level is increased, but the mobile terminal When the propagation loss decreases due to getting closer to the base station or moving out from behind buildings or mountains, it may be possible to save battery power by lowering the transmit power level.
送信電力を制御してバッテリセービングを行う方法では
、発呼または着呼により通話を開始する時や通話中のゾ
ーン切換え（ハンドオフ）を行う時にできるだけ伝搬損
失の小さい基地局を選択するよう制御することにより、
最大限のバッテリセービング効果が得られる。このこと
は、現行の自動車電話システムのように、各基地局の送
信電力がほぼ等しければ、受信電界強度が最も強い基地
局を選択すれば、伝搬損失も最も小さくなり最大限のバ
ッテリセービング効果が得られることになる。In the method of battery saving by controlling transmission power, control is performed to select a base station with the smallest possible propagation loss when starting a call by making or receiving a call, or when performing zone switching (handoff) during a call. According to
Maximum battery saving effect can be obtained. This means that if the transmission power of each base station is approximately equal, as in the current car phone system, selecting the base station with the strongest received field strength will minimize propagation loss and maximize battery saving. You will get it.
上述した従来の移動通信システムの基地局選択方式およ
び移動端末は、各基地局の送信電力がほぼ等しいので、
受信電界強度が最も強い基地局を選択すれば、伝搬損失
も最も小さくできるという原理に基づき構成されている
。しがしながら、現在では、小ゾーン方式の移動通信シ
ステムの需要の急激な増加に応えるために、トラヒック
の集中する都市部においてゾーンの細分化が進んでいる
。In the base station selection method and mobile terminal of the conventional mobile communication system described above, since the transmission power of each base station is approximately equal,
It is constructed based on the principle that propagation loss can be minimized by selecting the base station with the strongest received electric field strength. However, in order to meet the rapid increase in demand for small-zone mobile communication systems, zones are currently being segmented in urban areas where traffic is concentrated.
例えは東京における自動車電話のトラヒックの分布は千
代田、前出あたりに激しく集中しており、ＮＴＴではこ
れに対処するために東京部内のゾーンを細分化して加入
者容量の増加を図っている。For example, the distribution of car phone traffic in Tokyo is heavily concentrated in Chiyoda and the aforementioned areas, and to deal with this, NTT is attempting to increase subscriber capacity by subdividing zones within Tokyo.
同様に各国の主要都市においてゾーンの細分化が進んで
いる。このような事情は１９８６年８月１１日発行の雑
誌「日経エレクトロニクス」の９１ページから１０４ペ
ージに詳しく紹介されている。Similarly, zone fragmentation is progressing in major cities around the world. This situation is introduced in detail on pages 91 to 104 of the magazine ``Nikkei Electronics'' published on August 11, 1986.
将来の移動通信システムにおいては、少なくとも加入者
数が多い都市部では、基地局の数が大幅に増大してシス
テムコストが高くなるものの、ゾーン半径のきわめて小
さいマイクロゾーンシステムの導入が必須であるといえ
る。しかし都市部では多少システムコストが高くても良
いが、加入者数のさほど多くない郊外では、このような
マイクロゾーンシステムは経済的に引合わないため、現
行システムのような小ゾーンシステムでサービスを続け
ることになる。このように都市部ではマイクロゾーンを
用い、郊外では小ゾーンを用いるという両者を併用した
システムにより、加入者の面積密度にばらつきのあるサ
ービスエリアに対して効率的なシステムが構築できるこ
とになる。In future mobile communication systems, at least in urban areas with a large number of subscribers, it is essential to introduce microzone systems with extremely small zone radii, although the number of base stations will increase significantly and system costs will increase. I can say that. However, although the system cost may be slightly higher in urban areas, such a micro-zone system is not economically viable in suburban areas where the number of subscribers is not so large, so it is recommended to use a small-zone system like the current system. I will continue. In this way, by using a system that uses micro zones in urban areas and small zones in suburban areas, it is possible to construct an efficient system for service areas where the area density of subscribers varies.
ところで、このような著しく大きさの異なるゾーンが共
存する移動通信システムにおいては、各基地局にゾーン
の大きさに応じた送信電力が与えられるため、基地局の
送信電力の間に大きな差が生じる。このように基地局の
送信電力の間に大きな差があると、受信電界強度と伝搬
損失との間に相関関係がなくなるため、従来の基地局選
択方式をそのまま適用して、移動端末が受信電界強度の
最も強い基地局を選択しても、伝搬損失の最も小さい基
地局を選択したことにならず、送信電力制御技術により
バッテリセービングを行っても十分な効果は得られない
という問題点がある。By the way, in a mobile communication system where zones of significantly different sizes coexist, each base station is given transmission power according to the size of the zone, resulting in a large difference in the transmission power of the base stations. . If there is a large difference in the transmit power of base stations in this way, there will be no correlation between received field strength and propagation loss. Therefore, by applying the conventional base station selection method as is, mobile terminals There is a problem in that even if the base station with the strongest power is selected, it does not mean that the base station with the smallest propagation loss is selected, and even if battery saving is performed using transmission power control technology, sufficient effects cannot be obtained. .
本発明の目的は、大きさの異なるゾーンが共存する移動
通信システムにおいて、送信電力制御技術により最大限
のバッテリセービング効果を得るために、伝搬損失の最
も小さい基地局を選択する移動通信システムの基地局選
択方式と、それを実現する移動端末を提供することにあ
る。An object of the present invention is to provide a base station for a mobile communication system that selects a base station with the smallest propagation loss in order to obtain the maximum battery saving effect using transmission power control technology in a mobile communication system where zones of different sizes coexist. The purpose of this invention is to provide a station selection method and a mobile terminal that implements the method.
本発明の移動通信システムの基地局選択方式は、複数の
基地局によりサービスエリアをカバーする移動通信シス
テムであって、移動端末が周辺基地局の送信電力と実際
に受信した受信電力とから各周辺基地局との間の伝搬損
失を算出し、前記伝搬損失の最も少ない基地局を選択し
交信する構成である。A base station selection method for a mobile communication system according to the present invention is a mobile communication system that covers a service area with a plurality of base stations, in which a mobile terminal selects each neighboring base station based on the transmission power of neighboring base stations and the actually received reception power. The configuration is such that the propagation loss between base stations is calculated, and the base station with the least propagation loss is selected and communicated with.
又、本発明の移動通信システムの移動端末は、複数の基
地局によりサービスエリアをカバーする移動通信システ
ムの移動端末において、各周辺基地局の送信電力を求め
る手段と、前記各周辺基地局からの信号の受信電力を求
める手段と、前記送信電力と前記受信電力とから前記各
周辺基地局との間の伝搬損失を求める手段と、前記伝搬
損失の最も少ない基地局を選択し交信する手段とを有す
る構成である。Further, in a mobile terminal of a mobile communication system of the present invention, in which a service area is covered by a plurality of base stations, the mobile terminal includes means for determining the transmission power of each peripheral base station, and a means for determining the transmission power of each peripheral base station. means for determining the received power of a signal; means for determining the propagation loss between the respective peripheral base stations from the transmitted power and the received power; and means for selecting and communicating with the base station with the least propagation loss. This is a configuration that has
前述したように送信電力制御技術により最大限のバッテ
リセービング効果を得るためには、常に伝搬損失が最小
となる基地局を選択する必要がある。しかし各基地局の
送信電力の間に大きな差がある場合には、各基地局から
の信号の受信電界強度を比較しただけでは伝搬損失の大
小は判定できない、この場合、一般に移動通信システム
では、基地局および移動端末において、送受信に同一の
アンテナを用いているため、基地局から移動端末への下
り無線回線の伝搬損失と、移動端末から基地局への上り
無線回線の伝搬損失とは同一であると考えられる。そこ
で移動端末は、各基地局の送信電力を知ることかできれ
ば、その送信電力と受信電力との差から伝搬損失を直接
求めて比較することにより、伝搬損失が最小となる基地
局を選択することができることになる。As described above, in order to obtain the maximum battery saving effect using transmission power control technology, it is necessary to always select a base station with the minimum propagation loss. However, if there is a large difference between the transmission power of each base station, it is not possible to determine the magnitude of propagation loss just by comparing the received field strength of the signals from each base station.In this case, generally in mobile communication systems, Because the base station and mobile terminal use the same antenna for transmission and reception, the propagation loss on the downlink radio link from the base station to the mobile terminal is the same as the propagation loss on the uplink radio link from the mobile terminal to the base station. It is believed that there is. Therefore, if the mobile terminal can know the transmission power of each base station, it can directly determine the propagation loss from the difference between the transmission power and reception power and compare it, thereby selecting the base station with the minimum propagation loss. will be possible.
ここで、各基地局の送信電力を移動端末が知る方法とし
ては、基地局が現在の送信電力を示す信号を放送する方
法や、各基地局に送信電力を知ることができるような基
地局ＩＤを予め与えておく方法が考えられる。基地局の
送ｆ３電力を状況に応じて変化させるようなシステムで
は前者の方法が、基地局の送信電力を固定とするシステ
ムでは後者の方法が適している。Here, methods for a mobile terminal to know the transmission power of each base station include a method in which the base station broadcasts a signal indicating the current transmission power, or a method in which each base station is given a base station ID that allows it to know the transmission power. One possible method is to provide this in advance. The former method is suitable for a system in which the transmission f3 power of the base station is changed depending on the situation, and the latter method is suitable for a system in which the transmission power of the base station is fixed.
本発明では、待受は中あるいは通信中の移動端末が各周
辺基地局の下り制御チャネルを受信し、基地局ごとに送
信電力と実際に受信した受信電力との差から伝搬損失を
求めておく。そして通話開始時には、最も伝搬損失の少
ない基地局を選択して接続の要求を行う。又、通話中に
現在接続中の基地局の伝搬損失よりも少ない伝搬損失を
与える基地局が現れた場合には、その基地局に対してゾ
ーン切換え制御を開始する。In the present invention, a mobile terminal in standby or in communication receives the downlink control channel of each peripheral base station, and calculates the propagation loss from the difference between the transmission power and the actually received reception power for each base station. . When starting a call, the base station with the least propagation loss is selected and a connection request is made. Furthermore, if a base station that provides a propagation loss smaller than that of the currently connected base station appears during a call, zone switching control is started for that base station.
このようにすることで、移動端末は伝搬損失の最も小さ
い基地局を選択し接続することになるため、常に送信電
力を最も少なくなるように制御でき、最大限のバッテリ
セービング効果が得られる。By doing so, the mobile terminal selects and connects to the base station with the smallest propagation loss, so that the transmission power can always be controlled to be the lowest, and the maximum battery saving effect can be obtained.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の基地局選択方式の一実施例のブロック
図である。FIG. 1 is a block diagram of an embodiment of the base station selection method of the present invention.
基地局ａｌｏと基地局ｂｌｌと基地局ｃ１２とは、現在
の送信電力Ｐａ、Ｐｂ、Ｐｃを示す基地局送信電力コー
ドを含む基地局情報を送信している。Base station alo, base station bll, and base station c12 transmit base station information including base station transmission power codes indicating current transmission powers Pa, Pb, and Pc.
待受は中の移動端末２０は、基地局ａｌｏ、基地局ｂ１
１．基地局ｃ１２からの信号を定期的に受信し、信号中
の基地局送信電力コードがら送信電力Ｐａ、Ｐｂ、Ｐｃ
と、実際に受信した受信電力Ｅａ、Ｅｂ、Ｅｃとを求め
る。そして送信電力Ｐａ、Ｐｂ、Ｐｃと受信電力Ｅａ、
Ｅｂ Ｅｃとの差から、各基地局の伝搬損失Ｌａ、Ｌ
ｂ、Ｌｃを求める。発呼や着呼により通話を行う場合、
移動端末２０は各基地局の伝搬損失Ｌａ、ＬｂＬｃを比
較し、最も伝搬損失の小さい基地局を選択し通話を開始
する。例えば、第１図においてＬｂ＜Ｌａ＜Ｌｃとする
と、基地局ｂｌｌを選択する。The mobile terminal 20 in standby mode is connected to base station alo and base station b1.
1. A signal from the base station c12 is periodically received, and the transmission power Pa, Pb, Pc is determined from the base station transmission power code in the signal.
and the actually received received powers Ea, Eb, and Ec. And transmission power Pa, Pb, Pc and reception power Ea,
From the difference between Eb and Ec, the propagation loss La and L of each base station
Find b and Lc. When making a call by making or receiving a call,
The mobile terminal 20 compares the propagation losses La and LbLc of each base station, selects the base station with the smallest propagation loss, and starts a call. For example, if Lb<La<Lc in FIG. 1, base station bll is selected.
通話中にも、待受は中と同様に、移動端末２０は定期的
に伝搬損失Ｌａ、Ｌｂ、Ｌｃを求める。Even during a call, the mobile terminal 20 periodically calculates the propagation losses La, Lb, and Lc, as in the case of standby.
そして現在接続中の基地局ｂｌｌの伝搬損失Ｌｂと、他
の伝搬損失Ｌａ、Ｌｃとを比較し、現在接続中の基地局
ｂｌｌの伝搬損失Ｌｂよりも小さい伝搬損失を与える基
地局が現れた場合には、その基地局に対するゾーン切換
え制御を開始する。Then, the propagation loss Lb of the currently connected base station bll is compared with other propagation losses La and Lc, and if a base station appears that provides a propagation loss smaller than the propagation loss Lb of the currently connected base station bll. Then, zone switching control for that base station is started.
第２図は本発明の移動端末の一実施例のブロック図であ
る。FIG. 2 is a block diagram of an embodiment of a mobile terminal of the present invention.
基地局１０は、送信電力の値を示す基地局送信電力コー
ドと、基地局ＩＤを含む基地局情報を送信している。The base station 10 transmits base station information including a base station transmission power code indicating a value of transmission power and a base station ID.
基地局１０の送信する基地局情報は、待受は中や通話中
の移動端末２０のアンテナ２１と共用器２２とを経由し
て受信電力測定回路２３および受信回路２４に入力され
る。受信電力測定回路２３は、受信電力をＪｌｌ定しそ
の結果を演算器２５に出力する。受信回路２４は、基地
局情報中の基地局送信電力コードから求めた送信電力と
基地局ＩＤとを、演算器２５に対して出力する。演算器
２５は、送信電力の値と受信電力の値との差から伝搬損
失を計算し、基地局ＩＤと共にメモリ２６に記憶する。The base station information transmitted by the base station 10 is input to the received power measuring circuit 23 and the receiving circuit 24 via the antenna 21 and duplexer 22 of the mobile terminal 20 which is in standby mode or talking mode. The received power measurement circuit 23 determines the received power and outputs the result to the arithmetic unit 25. The receiving circuit 24 outputs the transmission power and base station ID obtained from the base station transmission power code in the base station information to the arithmetic unit 25. Arithmetic unit 25 calculates the propagation loss from the difference between the transmission power value and the reception power value, and stores it in memory 26 together with the base station ID.
制御部２７は、すべての周辺基地局の基地局ＩＤおよび
伝搬（！１失が求まるように、受信電力測定回路２３お
よび受信回路２４を制御する。The control unit 27 controls the received power measurement circuit 23 and the reception circuit 24 so that the base station ID and propagation (!1 loss) of all peripheral base stations are determined.
発呼または着呼応答の場合、制御部２７は、メモリ２６
の内容を比較し最も伝搬損失の少ない基地局を選び、こ
の基地局に対して発呼信号または着呼応答信号を送信す
るように送信回路２８を制御する。In the case of making a call or responding to an incoming call, the control unit 27 uses the memory 26
The base station with the smallest propagation loss is selected by comparing the contents, and the transmitting circuit 28 is controlled to transmit a calling signal or an incoming call response signal to this base station.
通話中の場合、制御部２７は、メモリ２６に記憶されて
いる現在接続中の基地局の伝搬損失と他の基地局の伝搬
損失とを定期的に比較し、現在接続中の基地局の伝搬損
失よりも小さい伝搬損失を与える基地局が現れた場合に
は、その基地局に対してゾーン切換え制御を開始するよ
うに送信回路２８を制御する。During a call, the control unit 27 periodically compares the propagation loss of the currently connected base station stored in the memory 26 with the propagation loss of other base stations, and determines the propagation loss of the currently connected base station. If a base station that provides a propagation loss smaller than the loss appears, the transmitting circuit 28 is controlled to start zone switching control for that base station.
以上詳細に説明したように、本発明は、大きさの異なる
ゾーンが共存する移動通信システムにおいても、移動端
末は伝搬損失の最も小さい基地局をｉＨ択し接続するこ
とができるので、 送信電力制御技術により最大限のバ
ッテリセーピンクが可能となるという効果が有る。As explained in detail above, the present invention allows a mobile terminal to select and connect to a base station with the smallest propagation loss even in a mobile communication system where zones of different sizes coexist, thereby controlling transmission power. The technology has the effect of making maximum battery saving possible.
第１図は本発明の基地局選択方式の一実施例のブロック
図、第２図は本発明の移動端末の一実施例のブロック図
である。
１０・・・・・・基地局ａ、１１・・・・・・基地局ｂ
、１２・・・・・・基地局Ｃｌ２Ｏ・・・・・・移動端
末、２１・・・・・・アンテナ、２２・・・・・・共用
器、２３・・・・・・受信電力測定回路、２４・・・・
・・受信回路、２５・・・・・・演算器、２６・・・・
・・メモリ、２７・・・・・・制御部、２８・・・・・
・送信回路、Ｅａ。
Ｅｂ、Ｅｃ・・・・・・受信電力、Ｌａ、Ｌｂ、Ｌｃ・
・・・・・伝搬損失、Ｐａ、Ｐｂ、Ｐｃ・・・・・・送
信電力。
代理人 弁理士 内 原 晋
蘭
図FIG. 1 is a block diagram of an embodiment of a base station selection method according to the present invention, and FIG. 2 is a block diagram of an embodiment of a mobile terminal according to the present invention. 10...Base station a, 11...Base station b
, 12... Base station Cl2O... Mobile terminal, 21... Antenna, 22... Duplexer, 23... Received power measurement circuit , 24...
...Receiving circuit, 25... Arithmetic unit, 26...
...Memory, 27...Control unit, 28...
・Transmission circuit, Ea. Eb, Ec...Received power, La, Lb, Lc・
......Pagination loss, Pa, Pb, Pc...Transmission power. Agent Patent Attorney Shinranzu Uchihara
Claims (2)
移動通信システムであって、移動端末が周辺基地局の送
信電力と実際に受信した受信電力とから各周辺基地局と
の間の伝搬損失を算出し、前記伝搬損失の最も少ない基
地局を選択し交信することを特徴とする移動通信システ
ムの基地局選択方式。(1) A mobile communication system that covers a service area with multiple base stations, in which a mobile terminal calculates the propagation loss between each peripheral base station from the transmission power of the peripheral base stations and the actually received reception power. A base station selection method for a mobile communication system, characterized in that the base station with the least propagation loss is selected and communicated with.
移動通信システムの移動端末において、各周辺基地局の
送信電力を求める手段と、前記各周辺基地局からの信号
の受信電力を求める手段と、前記送信電力と前記受信電
力とから前記各周辺基地局との間の伝搬損失を求める手
段と、前記伝搬損失の最も少ない基地局を選択し交信す
る手段とを有することを特徴とする移動通信システムの
移動端末。(2) In a mobile terminal of a mobile communication system that covers a service area with a plurality of base stations, means for determining the transmission power of each peripheral base station, means for determining the reception power of a signal from each of the peripheral base stations, and the A mobile communication system comprising: means for determining propagation loss between the respective peripheral base stations from the transmitted power and the received power; and means for selecting and communicating with the base station with the least propagation loss. Mobile terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63281920A JPH02126738A (en) | 1988-11-07 | 1988-11-07 | Base station selecting system and mobile terminal for mobile radio communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63281920A JPH02126738A (en) | 1988-11-07 | 1988-11-07 | Base station selecting system and mobile terminal for mobile radio communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02126738A true JPH02126738A (en) | 1990-05-15 |
Family
ID=17645794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63281920A Pending JPH02126738A (en) | 1988-11-07 | 1988-11-07 | Base station selecting system and mobile terminal for mobile radio communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02126738A (en) |
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|---|---|---|---|---|
| WO1998056196A1 (en) * | 1997-06-04 | 1998-12-10 | Ntt Mobile Communications Network Inc. | Mobile radio communication system, mobile station, and method for controlling diversity hand-over branch |
| JP2000350248A (en) * | 1999-04-30 | 2000-12-15 | Alcatel | Method for soft hand-over used in cdma mobile communication system and system having provision for the method |
| JP2006135520A (en) * | 2004-11-04 | 2006-05-25 | Nec Corp | Selecting method for radio base station device and wireless access network system |
| WO2007060731A1 (en) * | 2005-11-25 | 2007-05-31 | Fujitsu Limited | Mobile communication system, and mobile communication method |
| JP2010109534A (en) * | 2008-10-29 | 2010-05-13 | Kyocera Corp | Communicating method and communications terminal |
| JP2010124489A (en) * | 2010-01-26 | 2010-06-03 | Kyocera Corp | Communication apparatus and communication terminal |
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-
1988
- 1988-11-07 JP JP63281920A patent/JPH02126738A/en active Pending
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|---|---|---|---|---|
| US7873014B2 (en) | 1997-04-06 | 2011-01-18 | Ntt Docomo, Inc. | Mobile communication system, mobile station and diversity handover branch control method |
| US6728227B1 (en) | 1997-06-04 | 2004-04-27 | Ntt Docomo, Inc. | Mobile radio communication system, mobile station, and method for controlling diversity hand-over branch |
| WO1998056196A1 (en) * | 1997-06-04 | 1998-12-10 | Ntt Mobile Communications Network Inc. | Mobile radio communication system, mobile station, and method for controlling diversity hand-over branch |
| US8064908B2 (en) | 1997-06-04 | 2011-11-22 | Ntt Docomo, Inc. | Mobile communication system and mobile station performing diversity handover |
| US7570950B2 (en) | 1997-06-04 | 2009-08-04 | Ntt Docomo, Inc. | Mobile communication system, mobile station and diversity handover branch control method |
| JP2000350248A (en) * | 1999-04-30 | 2000-12-15 | Alcatel | Method for soft hand-over used in cdma mobile communication system and system having provision for the method |
| JP2006135520A (en) * | 2004-11-04 | 2006-05-25 | Nec Corp | Selecting method for radio base station device and wireless access network system |
| WO2007060731A1 (en) * | 2005-11-25 | 2007-05-31 | Fujitsu Limited | Mobile communication system, and mobile communication method |
| JP2010109534A (en) * | 2008-10-29 | 2010-05-13 | Kyocera Corp | Communicating method and communications terminal |
| JP2014060787A (en) * | 2009-11-02 | 2014-04-03 | Kyocera Corp | Radio communication system, base station, radio terminal and processor |
| US8908625B2 (en) | 2009-11-02 | 2014-12-09 | Kyocera Corporation | Radio communication system, low-power base station, high-power base station, radio terminal, and radio communication method |
| US9144061B2 (en) | 2009-11-02 | 2015-09-22 | Kyocera Corporation | Radio communication system, low-power base station, high-power base station, radio terminal, and radio communication method |
| US9420499B2 (en) | 2009-11-02 | 2016-08-16 | Kyocera Corporation | Radio communication system, low-power base station, high-power base station, radio terminal, and radio communication method |
| US9794835B2 (en) | 2009-11-02 | 2017-10-17 | Kyocera Corporation | Radio communication system, low-power base station, high-power base station, radio terminal, and radio communication method |
| JP2010124489A (en) * | 2010-01-26 | 2010-06-03 | Kyocera Corp | Communication apparatus and communication terminal |
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