JP2002112302A - Method and system for selecting base station in cdma system - Google Patents
Method and system for selecting base station in cdma systemInfo
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- JP2002112302A JP2002112302A JP2000294181A JP2000294181A JP2002112302A JP 2002112302 A JP2002112302 A JP 2002112302A JP 2000294181 A JP2000294181 A JP 2000294181A JP 2000294181 A JP2000294181 A JP 2000294181A JP 2002112302 A JP2002112302 A JP 2002112302A
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- 238000004891 communication Methods 0.000 claims abstract description 15
- 230000004044 response Effects 0.000 claims description 15
- 238000010295 mobile communication Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000010187 selection method Methods 0.000 claims 6
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、符号拡散多元接続
（Code Division Multiple Access:ＣＤＭＡ）方式にお
ける基地局選択システムに関し、特に、移動局による自
律的な呼分散を可能にする基地局選択システムである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station selection system in a code division multiple access (CDMA) system, and more particularly to a base station selection system capable of autonomous call distribution by mobile stations. is there.
【０００２】[0002]
【従来の技術】従来の移動通信における基地局選択シス
テムは、移動局の電源投入時に移動局が在圏する基地局
の内、受信電界強度が強い基地局を自動的に選択してい
たが、これは移動局で受信した情報のみで判断していた
方法である。2. Description of the Related Art A conventional base station selection system in mobile communication automatically selects a base station having a strong reception electric field strength from among base stations in which the mobile station is located when the mobile station is powered on. This is a method in which the determination is made only based on the information received by the mobile station.
【０００３】この方法では、移動局は機械的に最も距離
の近い基地局を選択してしまい、加入者の流動が激しい
繁華街等の基地局において呼の集中を招きやすい。In this method, the mobile station mechanically selects the base station closest to the mobile station, which tends to cause call concentration at a base station in a downtown area where the flow of subscribers is strong.
【０００４】従って、このように呼の集中する場所で
は、発生する呼量を予測し、発生した呼を周辺の基地局
群に分散するように各基地局のアンテナチルト角を制御
してサービスエリアの調整を実施していた。しかし、発
生呼量の予測は非常に難しく、現実的には満足な呼の分
散を実現しているとは言い難い状況であった。[0004] Therefore, in such a place where calls are concentrated, the amount of generated call is predicted, and the antenna tilt angle of each base station is controlled so that the generated call is distributed to a group of base stations in the vicinity. Was being adjusted. However, it was very difficult to predict the generated call volume, and it was difficult to actually say that satisfactory call distribution was realized.
【０００５】このため、従来この種の基地局選択システ
ムとしては、例えば特開平８ー１６８０７０号の文献の
ように、基地局はそれぞれ割り当て可能な通信用チャネ
ルにおける使用状況を制御チャネルによって複数の移動
端末に向けて送信し、移動端末は、複数の基地局が送信
する制御チャネルを順次走査し、受信可能な制御チャネ
ルの受信状況を観測するとともに、基地局における通信
チャネルの使用状況を受信し、この通信チャネル使用状
況と制御チャネルの受信状況から接続先候補となる基地
局を選択していた。For this reason, as a conventional base station selection system of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-168070, the base station uses a control channel to determine the use status of a communication channel that can be assigned to a plurality of mobile channels. Transmit to the terminal, the mobile terminal sequentially scans the control channel transmitted by a plurality of base stations, observes the reception state of the receivable control channel, receives the use state of the communication channel in the base station, A base station to be a connection destination candidate is selected based on the communication channel usage status and the control channel reception status.
【０００６】しかし、ＣＤＭＡ方式を採用した移動通信
では、呼の集中が起きると通信品質の劣化は徐々に起こ
り（Soft Degradation）、すぐには呼損にならないため
過負荷通信を容認する反面、通信品質の劣化が容易に発
生してしまうという特性を持っている。このため呼の集
中を防ぎ、通信品質を維持していくためには、従来のＴ
ＤＭＡ方式で採用された呼の分散システムでは不充分で
あった。However, in mobile communication employing the CDMA system, when call concentration occurs, the communication quality gradually deteriorates (Soft Degradation), and a call loss does not occur immediately. It has the property that quality degradation easily occurs. Therefore, in order to prevent call concentration and maintain communication quality, the conventional T
The call distribution system adopted in the DMA system was insufficient.
【０００７】[0007]
【発明が解決しようとする課題】これまで説明したよう
に、従来の基地局選択システムにおいては、移動局が基
地局を選択する際に移動局における制御チャネルの受信
状況や、基地局の通信チャネル使用率を参照して通信相
手の基地局を選択していたため、当該基地局選択システ
ムをＣＤＭＡ方式に適用する場合において、通信品質を
維持するためのより最適な呼の分散を実現することが充
分ではないという問題があった。As described above, in the conventional base station selection system, when the mobile station selects the base station, the reception status of the control channel in the mobile station, the communication channel of the base station, and the like. Since the base station of the communication partner is selected with reference to the usage rate, when the base station selection system is applied to the CDMA system, it is sufficient to realize more optimal call distribution for maintaining communication quality. There was a problem that was not.
【０００８】本発明は、上記に鑑みてなされたもので、
その目的とするところは、ＣＤＭＡ方式における移動局
主体の自律的な呼の分散を可能とする基地局選択システ
ムを提供することにある。[0008] The present invention has been made in view of the above,
An object of the present invention is to provide a base station selection system that enables autonomous call distribution mainly by mobile stations in the CDMA system.
【０００９】[0009]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、自局における現在のトラヒック
情報と過去のトラヒック情報を基地局制御装置に報告す
る手段を有する複数の基地局と、当該報告情報を記憶す
る手段を有する基地局制御装置と、当該複数の基地局の
サービスエリアが重なり合った状態を成しているオーバ
ーラップゾーン内に位置する移動局で構成される符号分
割多元接続方式の移動通信システムにおいて、電源投入
された前記移動局は、接続された基地局を経由して基地
局制御装置に記憶されている各基地局の現在のトラヒッ
ク情報と過去のトラヒック情報から導き出された基地局
選択優先度情報を入手する手段を備え、前記基地局選択
優先度情報を入手した移動局は、当該優先度情報に載っ
ている基地局に関する電波の受信品質を測定し、前記基
地局選択優先度情報と当該受信品質情報を基に通信相手
となる基地局を選択する手段とを具備させる。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a plurality of base stations having means for reporting current traffic information and past traffic information of the own station to a base station controller. And a base station controller having means for storing the report information, and a code division multiplex comprising a mobile station located in an overlap zone in which service areas of the plurality of base stations are in an overlapping state. In the connection type mobile communication system, the powered-on mobile station is derived from current traffic information and past traffic information of each base station stored in the base station controller via the connected base station. Means for obtaining the selected base station selection priority information, and the mobile station having obtained the base station selection priority information relates to the base station included in the priority information. That the reception quality of the radio wave is measured and is provided with a means for selecting the base station as a communication partner based on the base station selection priority information and the reception quality information.
【００１０】即ち、各基地局の現在のトラヒック情報
（送信電力増幅器使用率）を基に算出した選択優先度
と、各基地局の過去のトラヒック情報（最繁時集中率）
を基に算出した選択優先度と、移動局で測定した受信品
質を基に算出した選択優先度を加算して総合選択優先度
を導き出し、この値を基に移動局が基地局の選択を行う
ことができる。That is, the selection priority calculated based on the current traffic information (transmission power usage rate) of each base station, and the past traffic information (most busy concentration rate) of each base station.
Is added to the selection priority calculated based on the reception quality measured by the mobile station to derive an overall selection priority, and the mobile station selects a base station based on this value. be able to.
【００１１】また、前記基地局制御装置に記憶されてい
る基地局選択優先度は、当該基地局制御装置によって、
前記基地局から報告された現在のトラヒック情報（送信
電力増幅器使用率）に反比例した数値の選択優先度と、
過去のトラヒック情報（最繁時集中率）に反比例した数
値の選択優先度を加算して算出することを具備させる。The base station selection priority stored in the base station controller is determined by the base station controller.
Selection priority of a numerical value inversely proportional to the current traffic information (transmission power amplifier usage rate) reported from the base station;
Calculation is performed by adding a selection priority of a numerical value that is inversely proportional to past traffic information (the peak concentration rate during the busiest).
【００１２】また、前記移動局が通信相手となる基地局
を選択する手段は、当該移動局が測定した各基地局の受
信品質に比例した数値の選択優先度と、当該移動局が入
手した前記基地局制御装置からの基地局選択優先度を加
算して算出することを具備させる。Further, the means for selecting the base station with which the mobile station is to communicate includes a selection priority of a numerical value proportional to the reception quality of each base station measured by the mobile station, and a selection priority obtained by the mobile station. And calculating by adding the base station selection priority from the base station control device.
【００１３】[0013]
【発明の実施の形態】以下に図面を参照しつつ、本発明
の実施の形態を説明する。図１は、本発明を構成してい
る基地局制御装置（ＢＳＣ）と配下の基地局（ＢＴ
Ｓ）、移動局（ＭＳ）さらに各基地局におけるサービス
エリアの状況を示す概略図である。図１に示すように、
基地局制御装置６は、有線回線で基地局１と、基地局２
と、基地局３と、基地局４とに接続されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a base station controller (BSC) constituting the present invention and a subordinate base station (BT).
S) is a schematic diagram showing a situation of a service area in each mobile station (MS) and each base station. As shown in FIG.
The base station control device 6 includes a base station 1 and a base station 2 via a wired line.
, The base station 3 and the base station 4.
【００１４】また、基地局１により構成されるサービス
エリア１０と、基地局２のサービスエリア１１と、基地
局３のサービスエリア１２と、基地局４のサービスエリ
ア１３の各分布範囲（重なり具合）を示している。そし
て、移動局５は図１に示す位置におり、基地局１乃至基
地局４の各サービスエリアが重なっている所（オーバー
ラップゾーン）にいる。なお、各サービスエリア内の三
角印は当該サービスエリアで通信中の他の移動局分布状
況を表している。Each service area 10 composed of the base station 1, a service area 11 of the base station 2, a service area 12 of the base station 3, and a service area 13 of the base station 4 has respective distribution ranges (overlapping degree). Is shown. Then, the mobile station 5 is at the position shown in FIG. 1 and is in a place where the service areas of the base stations 1 to 4 overlap (overlap zone). Note that a triangle mark in each service area indicates the distribution status of other mobile stations communicating in the service area.
【００１５】そして各基地局と移動局５との距離関係並
びに各基地局内のトラヒック状況は以下の通りである。 ・基地局１：移動局５との距離は中間程度で、発生して
いる呼は比較的少ない。 ・基地局２：移動局５にもっとも近く、一番多くの呼が
発生している。 ・基地局３：移動局５から遠く離れており、発生呼は一
番少ない。 ・基地局４：移動局５から一番遠く離れており、基地局
２程度の多くの呼が発生している。The distance relationship between each base station and the mobile station 5 and the traffic situation in each base station are as follows. The base station 1: the distance from the mobile station 5 is about intermediate, and relatively few calls are occurring. Base station 2: closest to mobile station 5 and generates the most calls. Base station 3: far from mobile station 5 and generates the fewest calls. The base station 4 is farthest from the mobile station 5 and many calls of the base station 2 are generated.
【００１６】図２は、本発明の全体構成を概略的に示す
ブロック図である。図２に示すように、移動局５には基
地局選択優先度判定表を記憶するメモリ７を有してお
り、基地局１乃至基地局４と無線回線で接続されてい
る。また、基地局１乃至基地局４は基地局制御装置６と
有線回線で接続されており、基地局制御装置６には配下
の基地局に関するネイバーリストを記憶するメモリ８を
有している。FIG. 2 is a block diagram schematically showing the entire configuration of the present invention. As shown in FIG. 2, the mobile station 5 has a memory 7 for storing a base station selection priority determination table, and is connected to the base stations 1 to 4 by radio lines. Further, the base stations 1 to 4 are connected to the base station controller 6 via a wired line, and the base station controller 6 has a memory 8 for storing a neighbor list relating to subordinate base stations.
【００１７】そして、移動局５は周辺基地局が送信する
パイロットチャネルを受信してそのＳＩＲ（signal-to-
interference retio）値を測定する機能を有しており、
基地局１乃至基地局４は、一定の周期で自局の現在のト
ラヒック情報である送信電力増幅器使用率と過去のトラ
ヒック情報である最繁時集中率を上位の基地局制御装置
６に報告する機能を有する。基地局制御装置６は、配下
の各基地局の各種制御動作を司る装置で、各基地局から
報告された前記トラヒック情報等で構成された後述する
ネイバーリストを作成して管理する機能を有している。[0017] Then, the mobile station 5 receives the pilot channel transmitted by the peripheral base station and receives its pilot signal (SIR).
interference retio) value,
The base stations 1 to 4 report the transmission power amplifier usage rate, which is the current traffic information of the own station, and the busy hour concentration rate, which is the past traffic information, to the higher-level base station controller 6 at a fixed cycle. Has functions. The base station control device 6 is a device that performs various control operations of each subordinate base station, and has a function of creating and managing a neighbor list, which will be described later, including the traffic information and the like reported from each base station. ing.
【００１８】図３は、基地局制御装置６のメモリ内に設
けられたネイバーリストの具体的内容例である。図３に
示すように、当該ネイバーリストは、一定周期で各基地
局から報告された現在のトラヒック情報である送信電力
増幅器使用率と過去のトラヒック情報である最繁時集中
率の数値と、当該二つのトラヒック情報を基に基地局制
御装置が算出した二つの選択優先度と、当該二つの選択
優先度を基地局制御装置が加算したのち再度優先度評価
した基地局優先度情報で構成されている。FIG. 3 shows a specific example of the contents of the neighbor list provided in the memory of the base station controller 6. As shown in FIG. 3, the neighbor list includes a transmission power amplifier usage rate, which is current traffic information reported from each base station, and a numerical value of a busy hour concentration rate, which is past traffic information, reported at regular intervals. It is composed of two selection priorities calculated by the base station controller based on two pieces of traffic information, and base station priority information evaluated again after the base station controller adds the two selection priorities. I have.
【００１９】そして、ネイバーリストを構成している主
要要素に関する説明は以下の通りである。 ・送信電力増幅器使用率：当該基地局で処理している現
在のトラヒック値を表す数値である。トラヒックが高く
なれば、これにリンクして送信電力増幅器使用率も上昇
し、トラヒックが低くなれば送信電力増幅器使用率も低
下する。 ・最繁時集中率：１日に発生した総呼数に対する最繁時
の呼数の割合であり、これは過去のトラヒック情報を表
す数値である。即ち、過去において一番使用頻度の高い
時間帯にどのくらいの割合で呼が集中するかを示すもの
である。A description of the main elements constituting the neighbor list is as follows. Transmission power amplifier usage rate: Numerical value representing the current traffic value being processed by the base station. If the traffic becomes higher, the transmission power amplifier utilization increases in connection with the traffic, and if the traffic becomes lower, the transmission power amplifier utilization also decreases. Busy-hour concentration rate: The ratio of the number of calls at the busiest time to the total number of calls that occurred during the day, and is a numerical value representing past traffic information. In other words, it indicates how many calls are concentrated in a time zone that is most frequently used in the past.
【００２０】要は、トラヒックの集中度合いを表してお
り、最繁時集中率が高い値を示す基地局はトラヒックの
変動幅が大きい（トラヒックの集中が発生し易い）基地
局を示している。従って、最繁時集中率が高い基地局は
現在のトラヒックが低くても過去においてトラヒックの
集中が発生して、通信品質の低下を起こしたことがあ
り、このことから今後も通信品質の低下を招く可能性が
高いことを示している。The point is that it indicates the degree of concentration of traffic, and a base station showing a value with a highest concentration during the busy hour indicates a base station with a large fluctuation range of traffic (traffic concentration is likely to occur). Therefore, the base station with the highest concentration rate during the busiest time has a concentration of traffic in the past even if the current traffic is low, and the communication quality has deteriorated. This indicates that it is highly probable.
【００２１】今回のネイバーリスト例における送信電力
増幅器使用率とその選択優先度決定アルゴリズムは、使
用率が高くなるほど選択優先度は低くなる反比例の関係
にあり、当該優先度は２０段階評価している。この関係
を説明しているのが図５である。図５に示すように、送
信電力増幅器使用率が６０％の基地局１の場合は選択優
先度８となり、９０％（基地局２）では２となり、５０
％（基地局３）では１０となり、８０％（基地局４）で
は４となる。The transmission power amplifier usage rate and its selection priority determination algorithm in this example of the neighbor list are in inverse proportion such that the higher the usage rate is, the lower the selection priority is, and the priority is evaluated in 20 steps. . FIG. 5 illustrates this relationship. As shown in FIG. 5, in the case of the base station 1 in which the transmission power amplifier usage rate is 60%, the selection priority becomes 8, and in the case of 90% (the base station 2), the selection priority becomes 2, and 50
% (Base station 3) is 10 and 80% (base station 4) is 4.
【００２２】また、最繁時集中率とその選択優先度決定
アルゴリズムは、集中率が高くなるほど選択優先度は低
くなる反比例の関係にあり、当該優先度は１０段階評価
している。この関係を説明しているのが図６である。図
６に示すように、最繁時集中率が５０％の基地局１の場
合は選択優先度５となり、７０％（基地局２）では３と
なり、６０％（基地局３）では４となり、２０％（基地
局４）では８となる。そして、基地局優先度は上記二つ
の選択優先度を加算したのち再度１０段階評価してい
る。In addition, the busy hour concentration rate and the selection priority determination algorithm thereof have an inversely proportional relationship in which the higher the concentration rate, the lower the selection priority, and the priority is evaluated in 10 levels. FIG. 6 illustrates this relationship. As shown in FIG. 6, the selection priority is 5 in the case of the base station 1 in which the busy hour concentration rate is 50%, 3 in the case of 70% (base station 2), and 4 in the case of 60% (base station 3). It becomes 8 at 20% (base station 4). Then, the base station priority is evaluated again in 10 steps after adding the above two selection priorities.
【００２３】図４は、移動局５のメモリ内に設けられた
基地局選択優先度判定表の具体的内容例である。図４に
示すように、当該基地局選択優先度判定表は、各基地局
が送信しているパイロットチャネルを移動局５が測定し
た受信品質情報であるＳＩＲ値並びにその選択優先度
と、基地局を経由して送られてくる基地局制御装置に記
憶しているネイバーリスト上の基地局優先度と、前記二
つの選択優先度を加算した総合選択優先度情報で構成さ
れている。FIG. 4 shows a specific example of the contents of the base station selection priority determination table provided in the memory of the mobile station 5. As shown in FIG. 4, the base station selection priority determination table includes an SIR value, which is reception quality information obtained by measuring the pilot channel transmitted by each base station by the mobile station 5 and the selection priority, And the base station priority on the neighbor list stored in the base station control device transmitted via the base station controller, and the general selection priority information obtained by adding the two selection priorities.
【００２４】今回の基地局選択優先度判定表例における
測定ＳＩＲ値とその選択優先度決定アルゴリズムは、Ｓ
ＩＲ値が高くなるほど選択優先度は高くなる比例の関係
にあり、当該優先度は１０段階評価している。この関係
を説明しているのが図７である。図７に示すように、測
定ＳＩＲ値が７．５ｄＢの基地局１の場合は選択優先度
５となり、９ｄＢ（基地局２）では６となり、３ｄＢ
（基地局３）では２となり、１．５ｄＢ（基地局４）で
は１となる。The measured SIR value and the selection priority determining algorithm in the present base station selection priority determination table example are as follows.
The higher the IR value is, the higher the selection priority is in a proportional relationship, and the priority is evaluated in 10 steps. FIG. 7 illustrates this relationship. As shown in FIG. 7, in the case of the base station 1 having the measured SIR value of 7.5 dB, the selection priority is 5, and in the case of 9 dB (the base station 2), the selection priority is 6, and the selection priority is 3 dB.
The value is 2 for (base station 3) and 1 for 1.5 dB (base station 4).
【００２５】そして、総合選択優先度は上記二つの選択
優先度を加算して数値化評価しており、最終的には基地
局１が９．３ポイントとなって一番優先度が高くなって
おり、移動局５はこの基地局１を選択して待ち受け動作
に入る。The total selection priority is numerically evaluated by adding the above two selection priorities, and finally the base station 1 has the highest priority of 9.3 points. The mobile station 5 selects the base station 1 and enters a standby operation.
【００２６】図８は、本発明における移動局５と基地局
１乃至基地局４と基地局制御装置６の間で送り受けされ
る概略信号シーケンスチャート図である。図８に示すよ
うに、移動局５は電源投入する（ステップ２０）と、基
地局１乃至基地局４が送信しているパイロットチャネル
２１を受信して、これらの電波のＳＩＲ値を測定する。
図１において説明しているように、移動局５は基地局２
に最も近い距離にいるため基地局２におけるパイロット
チャネルの受信品質（ＳＩＲ値）が最良となり、移動局
５は基地局２に対して位置登録信号２２を送る。FIG. 8 is a schematic signal sequence chart transmitted and received among the mobile station 5, the base stations 1 to 4 and the base station controller 6 according to the present invention. As shown in FIG. 8, when the mobile station 5 is powered on (step 20), it receives the pilot channels 21 transmitted by the base stations 1 to 4, and measures the SIR values of these radio waves.
As described in FIG. 1, the mobile station 5 is the base station 2
, The reception quality (SIR value) of the pilot channel in the base station 2 becomes the best, and the mobile station 5 sends a position registration signal 22 to the base station 2.
【００２７】位置登録信号２２を受信した基地局２は、
基地局制御装置６に対して位置登録信号２３を送る。基
地局制御装置６は、基地局２経由で移動局５からの初め
ての位置登録信号２３を受けて、基地局制御装置内のメ
モリに記憶されているネイバーリストを含む位置登録応
答信号２４を基地局２に対して送る。The base station 2 having received the position registration signal 22
A position registration signal 23 is sent to the base station controller 6. The base station controller 6 receives the first location registration signal 23 from the mobile station 5 via the base station 2 and sends the location registration response signal 24 including the neighbor list stored in the memory in the base station controller to the base station controller 6. Send to station 2.
【００２８】基地局２はネイバーリストを含む位置登録
応答信号２４を受けて、移動局５に対してネイバーリス
トを含む位置登録応答信号２５を送る。移動局５は、ネ
イバーリストを含む位置登録応答信号２５を受信するこ
とでネイバーリストを入手することができる（ステップ
２６）。The base station 2 receives the location registration response signal 24 including the neighbor list, and sends a location registration response signal 25 including the neighbor list to the mobile station 5. The mobile station 5 can obtain the neighbor list by receiving the location registration response signal 25 including the neighbor list (step 26).
【００２９】ネイバーリストを入手した移動局５は、再
び各基地局が送信しているパイロットチャネル２７を受
信してこれらの電波のＳＩＲ値を測定し、基地局選択優
先度判定表における必要情報の入手を完了する（ステッ
プ２８）。移動局５は、測定したＳＩＲ値を基に反比例
計算して選択優先度を算出し、この値とネイバーリスト
から入手した基地局選択優先度を加算して総合選択優先
度を決定する（ステップ２９）。The mobile station 5 having obtained the neighbor list receives the pilot channel 27 transmitted from each base station again, measures the SIR values of these radio waves, and determines the necessary information in the base station selection priority determination table. The acquisition is completed (step 28). The mobile station 5 calculates the selection priority by performing an inverse proportional calculation based on the measured SIR value, and determines the total selection priority by adding this value and the base station selection priority obtained from the neighbor list (step 29). ).
【００３０】今回の例における決定結果は、図４におけ
る基地局選択優先度判定表のように基地局１が選択さ
れ、基地局１に対して位置登録信号３０を送る。位置登
録信号３０を受信した基地局１は、基地局制御装置６に
対して位置登録信号３１を送る。基地局制御装置６は、
移動局５からの２度目の位置登録信号３１を受けて、基
地局１に対して位置登録応答信号３２を送る。基地局１
は、位置登録応答信号３２を受けて、移動局５に対して
位置登録応答信号３３を送り、待ち受け動作準備が完了
する。As a result of the determination in this example, the base station 1 is selected as shown in the base station selection priority determination table in FIG. The base station 1 that has received the position registration signal 30 sends a position registration signal 31 to the base station controller 6. The base station controller 6
Upon receiving the second location registration signal 31 from the mobile station 5, it sends a location registration response signal 32 to the base station 1. Base station 1
Receives the location registration response signal 32, sends a location registration response signal 33 to the mobile station 5, and the standby operation preparation is completed.
【００３１】その後、再々度各基地局が送信しているパ
イロットチャネル３４を受信してこれらの電波のＳＩＲ
値を測定し、前回測定・記憶したＳＩＲ値との違いが出
たかどうかを調査して見直す動作（ステップ３５）を行
っている。最後に移動局５は、位置登録した基地局に対
して待ち受け動作に移行する（ステップ３６）。Thereafter, the pilot channel 34 transmitted from each base station is received again, and the SIRs of these radio waves are received.
The value is measured, and an operation (step 35) is performed to check whether there is a difference from the previously measured and stored SIR value and to review it. Finally, the mobile station 5 shifts to a standby operation for the base station whose position has been registered (step 36).
【００３２】図９乃至図１１は、本発明における移動局
５に関する動作フローチャート図である。図９乃至図１
１に示すように、移動局５は電源投入すると、基地局１
乃至基地局４が送信しているパイロットチャネルを順番
に受信し（ステップ１００）、受信した電波のＳＩＲ値
を測定し（ステップ１０１）、全てのパイロットチャネ
ルの測定が終了するまで上記の処理を繰り返して行う
（ステップ１０２）。FIGS. 9 to 11 are operation flowcharts relating to the mobile station 5 in the present invention. 9 to 1
As shown in FIG. 1, when the mobile station 5 is powered on, the base station 1
The base station 4 sequentially receives the pilot channels transmitted by the base station 4 (step 100), measures the SIR values of the received radio waves (step 101), and repeats the above processing until the measurement of all pilot channels is completed. (Step 102).
【００３３】移動局５は、測定したＳＩＲ値の中から最
大となるものを選び（ステップ１０３）、当該最大ＳＩ
Ｒ値の基地局に対して位置登録信号を送信する（ステッ
プ１０４）。今回の例では、基地局２が最大ＳＩＲ値と
なる。The mobile station 5 selects the largest SIR value from the measured SIR values (step 103), and
A location registration signal is transmitted to the base station having the R value (step 104). In this example, the base station 2 has the maximum SIR value.
【００３４】上記基地局（基地局２）に対して送信した
位置登録信号の返答として基地局制御装置から位置登録
応答信号が送られてくるが、この位置登録応答信号には
基地局制御装置配下の全ての基地局における送信電力増
幅器使用率と最繁時集中率から算出された基地局選択優
先度情報であるネイバーリストが含まれており、移動局
５はこの位置登録応答信号からネイバーリストを入手す
る（ステップ１０５）。A location registration response signal is sent from the base station controller as a response to the location registration signal transmitted to the base station (base station 2). The location registration response signal includes a subordinate of the base station controller. And the neighbor list, which is base station selection priority information calculated from the transmission power amplifier usage rate and the busy hour concentration rate in all base stations, is included in the mobile station 5. Obtain (step 105).
【００３５】移動局５は、ネイバーリストに記載されて
いる各基地局が送信しているパイロットチャネルを順番
に受信し（ステップ１０６）、受信した電波のＳＩＲ値
を測定し（ステップ１０７）、ネイバーリストにおける
全てのパイロットチャネルの測定が終了するまで上記の
処理を繰り返して行う（ステップ１０８）。The mobile station 5 sequentially receives the pilot channels transmitted by each base station described in the neighbor list (step 106), measures the SIR value of the received radio wave (step 107), and The above processing is repeated until the measurement of all pilot channels in the list is completed (step 108).
【００３６】移動局５は、測定したＳＩＲ値全てを基地
局選択優先度判定表に記憶し（ステップ１０９）、前記
入手したネイバーリスト上の基地局選択優先度情報を基
地局選択優先度判定表に記憶し（ステップ１１０）、上
記基地局選択優先度判定表に記憶された二つの選択優先
度を加算して総合選択優先度を決定する（ステップ１１
１）。The mobile station 5 stores all the measured SIR values in the base station selection priority determination table (step 109), and stores the obtained base station selection priority information in the neighbor list in the base station selection priority determination table. (Step 110), and the two selection priorities stored in the base station selection priority determination table are added to determine the overall selection priority (Step 11).
1).
【００３７】今回の例では、総合選択優先度が一番高く
なった基地局は基地局１であり、移動局５は当該基地局
（基地局１）に対して待ち受け動作をするための準備と
して、位置登録信号を送信する（ステップ１１２）。そ
の結果、移動局５は基地局と基地局制御装置を経由して
位置登録応答信号を受信する（ステップ１１３）。In this example, the base station having the highest total selection priority is the base station 1, and the mobile station 5 prepares for the base station (base station 1) to perform a standby operation. , And transmits a position registration signal (step 112). As a result, the mobile station 5 receives the location registration response signal via the base station and the base station controller (step 113).
【００３８】その後、移動局５は、基地局選択優先度判
定表に記載されている各基地局が送信しているパイロッ
トチャネルを順番に受信し（ステップ１１４）、受信し
た電波のＳＩＲ値を測定し（ステップ１１５）、基地局
選択優先度判定表における全てのパイロットチャネルの
測定が終了するまで上記の処理を繰り返して行う（ステ
ップ１１６）。Thereafter, mobile station 5 sequentially receives the pilot channels transmitted by each base station described in the base station selection priority determination table (step 114), and measures the SIR value of the received radio wave. Then, the above processing is repeated until the measurement of all pilot channels in the base station selection priority determination table is completed (step 116).
【００３９】そして、移動局５は、今回の測定結果と基
地局選択優先度判定表に記憶されているＳＩＲ値を比較
し（ステップ１１７）、基地局選択優先度の判定に変化
がでるかどうかを調べて（ステップ１１８）、変化がで
る場合は選択優先度の値を書き換えて総合選択優先度を
見直しして（ステップ１１９）、再度位置登録信号送出
動作に戻る。最後に移動局５は、位置登録した基地局に
対して待ち受け動作に移行する（ステップ１２０）。Then, the mobile station 5 compares the current measurement result with the SIR value stored in the base station selection priority determination table (step 117), and determines whether or not the determination of the base station selection priority changes. (Step 118), and if a change occurs, the value of the selection priority is rewritten to review the overall selection priority (Step 119), and the process returns to the position registration signal transmission operation again. Finally, the mobile station 5 shifts to a standby operation for the base station whose position has been registered (step 120).
【００４０】[0040]
【発明の効果】以上説明したように、本発明によれば、
各基地局の現在のトラヒック情報である送信電力増幅器
使用率を基に算出した選択優先度と、各基地局の過去の
トラヒック情報である最繁時集中率を基に算出した選択
優先度と、移動局で測定した受信品質を基に算出した選
択優先度を加算して総合選択優先度を導き出し、この値
を基に移動局が基地局の選択を行うので、より充分な呼
の分散処理をすることができ、よって、ＣＤＭＡ方式に
おける移動局主体の最適な呼の分散を可能とする基地局
選択システムを提供することができるという効果が得ら
れる。As described above, according to the present invention,
A selection priority calculated based on the transmission power amplifier usage rate that is the current traffic information of each base station, and a selection priority calculated based on the busy hour concentration rate that is the past traffic information of each base station, The total selection priority is derived by adding the selection priority calculated based on the reception quality measured by the mobile station, and the mobile station selects the base station based on this value, so that more sufficient call distribution processing can be performed. Therefore, it is possible to provide an effect of providing a base station selection system capable of optimally distributing calls mainly for mobile stations in the CDMA system.
【図１】本発明を構成している基地局制御装置（ＢＳ
Ｃ）と配下の基地局（ＢＴＳ）、移動局（ＭＳ）さらに
各基地局におけるサービスエリアの状況を示す概略図で
ある。FIG. 1 is a block diagram showing a base station controller (BS) constituting the present invention;
FIG. 3C is a schematic diagram showing the status of a service area in each of base stations (BTS), mobile stations (MS), and subordinate base stations (BTS).
【図２】本発明の全体構成を概略的に示すブロック図で
ある。FIG. 2 is a block diagram schematically showing an overall configuration of the present invention.
【図３】基地局制御装置６のメモリ内に設けられたネイ
バーリストの具体的内容例である。FIG. 3 is an example of specific contents of a neighbor list provided in a memory of the base station control device 6;
【図４】移動局５のメモリ内に設けられた基地局選択優
先度判定表の具体的内容例である。FIG. 4 is an example of specific contents of a base station selection priority determination table provided in a memory of a mobile station 5;
【図５】送信電力増幅器使用率とその選択優先度を評価
している関係図である。FIG. 5 is a relationship diagram for evaluating a transmission power amplifier usage rate and its selection priority.
【図６】最繁時集中率とその選択優先度を評価している
関係図である。FIG. 6 is a relationship diagram for evaluating the busy hour concentration rate and its selection priority.
【図７】基地局選択優先度判定表例における測定ＳＩＲ
値とその選択優先度を評価している関係図である。FIG. 7 shows a measured SIR in an example of a base station selection priority determination table.
It is a relation diagram which evaluates a value and the selection priority.
【図８】本発明における移動局５と基地局１乃至基地局
４と基地局制御装置６の間で送り受けされる概略信号シ
ーケンスチャート図である。FIG. 8 is a schematic signal sequence chart transmitted and received among the mobile station 5, the base stations 1 to 4 and the base station controller 6 according to the present invention.
【図９】本発明における移動局５に関する動作フローチ
ャート図（１／３）である。FIG. 9 is an operation flowchart (1/3) of the mobile station 5 according to the present invention.
【図１０】本発明における移動局５に関する動作フロー
チャート図（２／３）である。FIG. 10 is an operation flowchart (2/3) of the mobile station 5 according to the present invention.
【図１１】本発明における移動局５に関する動作フロー
チャート図（３／３）である。FIG. 11 is an operation flowchart (3/3) relating to the mobile station 5 in the present invention.
１、２、３、４ 基地局 ５ 移動局 ６ 基地局制御装置 ７ 基地局選択優先度判定表 ８ ネイバーリスト １０ 基地局１のサービスエリア １１ 基地局２のサービスエリア １２ 基地局３のサービスエリア １３ 基地局４のサービスエリア 1, 2, 3, 4 base station 5 mobile station 6 base station controller 7 base station selection priority determination table 8 neighbor list 10 base station 1 service area 11 base station 2 service area 12 base station 3 service area 13 Service area of base station 4
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０４Ｂ 17/00 Ｈ０４Ｊ 13/00 Ａ Ｈ０４Ｊ 13/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H04B 17/00 H04J 13/00 A H04J 13/00
Claims (12)
去のトラヒック情報を基地局制御装置に報告する手段を
有する複数の基地局と、当該報告情報を記憶する手段を
有する基地局制御装置と、当該複数の基地局のサービス
エリアが重なり合った状態を成しているオーバーラップ
ゾーン内に位置する移動局で構成される符号分割多元接
続方式の移動通信システムにおいて、 電源投入された前記移動局は、接続された基地局を経由
して基地局制御装置に記憶されている各基地局の現在の
トラヒック情報と過去のトラヒック情報から導き出され
た基地局選択優先度情報を入手する手段を備え、 前記基地局選択優先度情報を入手した移動局は、当該優
先度情報に載っている基地局に関する電波の受信品質を
測定し、前記基地局選択優先度情報と当該受信品質情報
を基に通信相手となる基地局を選択する手段を有するこ
とを特徴とする基地局選択システム。A plurality of base stations each having means for reporting current traffic information and past traffic information of the own station to a base station control device; a base station control device having means for storing the report information; In a mobile communication system of a code division multiple access system composed of mobile stations located in an overlap zone in which service areas of a plurality of base stations are in an overlapped state, the mobile stations powered on are connected to each other. Means for obtaining base station selection priority information derived from current traffic information and past traffic information of each base station stored in the base station control device via the base station, wherein the base station The mobile station that has obtained the selection priority information measures the reception quality of radio waves for the base station described in the priority information, and determines the base station selection priority information and Base station selection system characterized by comprising means for selecting a base station as a communication partner based on the signal quality information.
局の送信電力使用率を用いることを特徴とする請求項１
記載の基地局選択システム。2. The transmission power usage rate of a base station is used as the current traffic information.
The base station selection system according to the above.
局の最繁時集中率を用いることを特徴とする請求項１記
載の基地局選択システム。3. The base station selection system according to claim 1, wherein the past traffic information uses a busy hour concentration rate of the base station.
た基地局制御装置と、当該基地局のサービスエリアが重
なり合った状態を成しているオーバーラップゾーン内に
位置している移動局で構成される符号分割多元接続方式
の移動通信システムにおいて、 前記基地局は一定の周期で自局の送信電力使用率と最繁
時集中率を上位の基地局制御装置に報告する手段と、前
記基地局制御装置は前記報告された情報を記憶し、当該
情報から基地局選択優先度情報を導き出す手段とを備
え、 電源投入された前記移動局は、電源投入時に接続された
基地局を経由して基地局制御装置に記憶されている基地
局選択優先度情報を入手するために位置登録信号を送出
する手段と、 前記基地局は、前記位置登録信号を受信したら基地局制
御装置に記憶されている各基地局の送信電力増幅器使用
率と最繁時集中率から導き出された基地局選択優先度情
報を入手し、当該入手情報を前記移動局に対して位置登
録応答信号に含めて送信する手段と、 前記基地局選択優先度情報を含む位置登録応答信号を受
信した移動局は、当該優先度情報に載っている基地局に
関する電波の受信品質を測定する手段と、 前記基地局選択優先度情報と前記受信品質情報を入手し
た移動局は、当該二つの情報を基に通信相手となる基地
局を選択する手段を有することを特徴とする基地局選択
システム。4. A mobile station located in an overlap zone in which a plurality of base stations, a base station controller connected to the base station, and a service area of the base station overlap each other. In a mobile communication system of a code division multiple access system configured by the base station, the base station reports a transmission power usage rate and a busy hour concentration rate of the base station to a higher-level base station control device at a fixed cycle, The base station controller stores the reported information, and derives base station selection priority information from the information.The mobile station that is powered on is connected to the base station connected at the time of power on. Means for transmitting a location registration signal to obtain the base station selection priority information stored in the base station controller, and the base station is stored in the base station controller when the location registration signal is received. Each A means for acquiring base station selection priority information derived from the transmission power amplifier usage rate and the peak concentration rate of the base station and transmitting the acquired information included in the location registration response signal to the mobile station, The mobile station that has received the location registration response signal including the base station selection priority information, measures a radio wave reception quality of the base station included in the priority information, and the base station selection priority information and A base station selection system, wherein a mobile station that has obtained reception quality information has means for selecting a base station to be a communication partner based on the two pieces of information.
地局選択優先度は、当該基地局制御装置によって、前記
基地局から報告された送信電力増幅器使用率に反比例し
た数値の選択優先度と、最繁時集中率に反比例した数値
の選択優先度を加算して算出することを特徴とする請求
項１乃び請求項４のいずれかに記載の基地局選択システ
ム。5. The base station selection priority stored in the base station controller includes a selection priority of a numerical value inversely proportional to the transmission power amplifier usage rate reported from the base station by the base station controller. The base station selection system according to any one of claims 1 to 4, wherein the calculation is performed by adding a selection priority of a numerical value inversely proportional to the busy hour concentration rate.
択する手段は、当該移動局が測定した各基地局の受信品
質に比例した数値の選択優先度と、当該移動局が入手し
た前記基地局制御装置からの基地局選択優先度を加算し
て算出することを特徴とする請求項１乃び請求項４のい
ずれかに記載の基地局選択システム。6. The means for selecting a base station with which the mobile station is to communicate includes a selection priority of a numerical value proportional to the reception quality of each base station measured by the mobile station, and a selection priority obtained by the mobile station. The base station selection system according to any one of claims 1 to 4, wherein the base station selection priority is calculated by adding a base station selection priority from the base station control device.
去のトラヒック情報を基地局制御装置に報告する複数の
基地局と、当該報告情報を記憶する基地局制御装置と、
当該複数の基地局のサービスエリアが重なり合った状態
を成しているオーバーラップゾーン内に位置する移動局
で構成される符号分割多元接続方式の移動通信システム
において、 電源投入された前記移動局は、接続された基地局を経由
して基地局制御装置に記憶されている各基地局の現在の
トラヒック情報と過去のトラヒック情報から導き出され
た基地局選択優先度情報を入手し、 前記基地局選択優先度情報を入手した移動局は、当該優
先度情報に載っている基地局に関する電波の受信品質を
測定し、前記基地局選択優先度情報と当該受信品質情報
を基に通信相手となる基地局を選択することを特徴とす
る基地局選択方法。7. A plurality of base stations for reporting current traffic information and past traffic information in the own station to a base station control device, a base station control device for storing the report information,
In a mobile communication system of a code division multiple access system configured by mobile stations located in an overlap zone in which service areas of the plurality of base stations are in an overlapping state, the mobile station powered on includes: Obtain base station selection priority information derived from current traffic information and past traffic information of each base station stored in the base station control device via the connected base station, and obtain the base station selection priority. The mobile station that has obtained the degree information measures the reception quality of radio waves related to the base station described in the priority information, and determines the base station to be a communication partner based on the base station selection priority information and the reception quality information. A base station selection method, comprising: selecting a base station.
局の送信電力使用率を用いることを特徴とする請求項７
記載の基地局選択方法。8. The transmission power usage rate of a base station is used as the current traffic information.
The base station selection method described in the above.
局の最繁時集中率を用いることを特徴とする請求項７記
載の基地局選択方法。9. The base station selection method according to claim 7, wherein the most concentrated time of the base station is used as the past traffic information.
れた基地局制御装置と、当該基地局のサービスエリアが
重なり合った状態を成しているオーバーラップゾーン内
に位置している移動局で構成される符号分割多元接続方
式の移動通信システムにおいて、 前記基地局は一定の周期で自局の送信電力使用率と最繁
時集中率を上位の基地局制御装置に報告し、前記基地局
制御装置は前記報告された情報を記憶し、当該情報から
基地局選択優先度情報を導き出し、 電源投入された前記移動局は、電源投入時に接続された
基地局を経由して基地局制御装置に記憶されている基地
局選択優先度情報を入手するために位置登録信号を送出
し、 前記基地局は、前記位置登録信号を受信したら基地局制
御装置に記憶されている各基地局の送信電力増幅器使用
率と最繁時集中率から導き出された基地局選択優先度情
報を入手し、当該入手情報を前記移動局に対して位置登
録応答信号に含めて送信し、 前記基地局選択優先度情報を含む位置登録応答信号を受
信した移動局は、当該優先度情報に載っている基地局に
関する電波の受信品質を測定し、 前記基地局選択優先度情報と前記受信品質情報を入手し
た移動局は、当該二つの情報を基に通信相手となる基地
局を選択することを特徴とする基地局選択方法。10. A mobile station located in an overlap zone in which a plurality of base stations, a base station controller connected to the base station, and a service area of the base station overlap each other. In the mobile communication system of the code division multiple access system, the base station reports its own transmission power usage rate and the busy hour concentration rate to a higher-level base station controller at a fixed cycle, and the base station The control device stores the reported information, derives base station selection priority information from the information, and the power-on mobile station transmits to the base station control device via the base station connected at power-on. The base station sends a location registration signal to obtain the stored base station selection priority information, and the base station, upon receiving the location registration signal, transmits the transmission power of each base station stored in the base station controller. use The base station selection priority information derived from the rate and the busiest concentration rate, transmit the obtained information included in the location registration response signal to the mobile station, and include the base station selection priority information The mobile station that has received the location registration response signal measures the reception quality of radio waves for the base station listed in the priority information, and the mobile station that has obtained the base station selection priority information and the reception quality information is A base station selection method, wherein a base station to be a communication partner is selected based on two pieces of information.
基地局選択優先度は、当該基地局制御装置によって、前
記基地局から報告された送信電力増幅器使用率に反比例
した数値の選択優先度と、最繁時集中率に反比例した数
値の選択優先度を加算して算出することを特徴とする請
求項７乃び請求項１０のいずれかに記載の基地局選択方
法。11. The base station selection priority stored in the base station control device includes a selection priority of a numerical value inversely proportional to a transmission power amplifier usage rate reported from the base station by the base station control device. 11. The base station selection method according to claim 7, wherein the calculation is performed by adding a selection priority of a numerical value inversely proportional to the busy hour concentration rate.
選択する方法は、当該移動局が測定した各基地局の受信
品質に比例した数値の選択優先度と、当該移動局が入手
した前記基地局制御装置からの基地局選択優先度を加算
して算出することを特徴とする請求項７乃び請求項１０
のいずれかに記載の基地局選択方法。12. The method in which the mobile station selects a base station with which the mobile station communicates includes selecting a numerical priority in proportion to the reception quality of each base station measured by the mobile station, and selecting the numerical value obtained by the mobile station. 11. The calculation according to claim 7, further comprising adding a base station selection priority from the base station controller.
The base station selection method according to any one of the above.
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|---|---|---|---|
| JP2000294181A JP3479837B2 (en) | 2000-09-27 | 2000-09-27 | Base station selection system and base station selection method in CDMA system |
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| JP2000294181A JP3479837B2 (en) | 2000-09-27 | 2000-09-27 | Base station selection system and base station selection method in CDMA system |
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| Publication Number | Publication Date |
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| JP3479837B2 JP3479837B2 (en) | 2003-12-15 |
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| JP2000294181A Expired - Fee Related JP3479837B2 (en) | 2000-09-27 | 2000-09-27 | Base station selection system and base station selection method in CDMA system |
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