JP2939116B2 - Mobile communication handover method, mobile station apparatus and base station apparatus - Google Patents
Mobile communication handover method, mobile station apparatus and base station apparatusInfo
- Publication number
- JP2939116B2 JP2939116B2 JP8970094A JP8970094A JP2939116B2 JP 2939116 B2 JP2939116 B2 JP 2939116B2 JP 8970094 A JP8970094 A JP 8970094A JP 8970094 A JP8970094 A JP 8970094A JP 2939116 B2 JP2939116 B2 JP 2939116B2
- Authority
- JP
- Japan
- Prior art keywords
- cell
- reception level
- mobile station
- base station
- noise ratio
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 30
- 238000010295 mobile communication Methods 0.000 title claims description 29
- 238000004891 communication Methods 0.000 claims description 86
- 241000269799 Perca fluviatilis Species 0.000 claims description 46
- 230000005540 biological transmission Effects 0.000 claims description 24
- 238000005259 measurement Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 102100033868 Cannabinoid receptor 1 Human genes 0.000 description 29
- 101000710899 Homo sapiens Cannabinoid receptor 1 Proteins 0.000 description 29
- 238000012545 processing Methods 0.000 description 9
- 102100036214 Cannabinoid receptor 2 Human genes 0.000 description 7
- 101000875075 Homo sapiens Cannabinoid receptor 2 Proteins 0.000 description 7
- 101001116931 Homo sapiens Protocadherin alpha-6 Proteins 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 101001116937 Homo sapiens Protocadherin alpha-4 Proteins 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70702—Intercell-related aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スペクトル拡散符号を
用いた符号分割多元接続（以下、ＣＤＭＡと略称する）
方式の移動通信システムにおける移動通信ハンドオーバ
方法および移動局装置と基地局装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code division multiple access (hereinafter abbreviated as CDMA) using a spread spectrum code.
TECHNICAL FIELD The present invention relates to a mobile communication handover method, a mobile station apparatus, and a base station apparatus in a mobile communication system of a mobile communication system.
【０００２】[0002]
【従来の技術】スペクトル拡散符号を用いたＣＤＭＡ方
式の移動通信システムにおいては、サービスエリアを複
数の単位領域であるセルに分割するとともに、各セル内
に１つの基地局を設け、サービスエリア内のあるセル内
に存在する移動局は無線回線を介してそのセルの基地局
と通信し、該基地局から更に他の無線回線または通信回
線を介して他の移動局または電話機等と通信を行うよう
になっている。2. Description of the Related Art In a CDMA mobile communication system using spread spectrum codes, a service area is divided into a plurality of unit areas, cells, and one base station is provided in each cell. A mobile station existing in a certain cell communicates with a base station of the cell via a radio line, and communicates with another mobile station or a telephone or the like from the base station via another radio line or a communication line. It has become.
【０００３】また、ＣＤＭＡ方式の移動通信システムに
おいて、各セルの基地局は同一周波数のそれぞれ異なる
独自の拡散符号を割り当てられ、該拡散符号で拡散さ
れ、送信電力制御を行わない送信電力一定の止まり木チ
ャネルを常時送信している。例えば、図５に示すよう
に、サービスエリア内に設けられている複数のセル１，
２，３，・・・にはそれぞれ基地局Ｂ１，Ｂ２，Ｂ３，
・・・が設けられ、各基地局Ｂ１，Ｂ２，Ｂ３，・・・
にはそれぞれ異なる拡散符号Ｃ１，Ｃ２，Ｃ３，・・・
が割り当てられている。そして、各セルの基地局は、こ
の割り当てられた拡散符号で拡散された止まり木チャネ
ルを常時送信している。In a CDMA mobile communication system, the base stations of each cell are assigned different unique spreading codes of the same frequency, spread with the spreading codes, and stop at a fixed transmission power without performing transmission power control. The tree channel is constantly transmitted. For example, as shown in FIG. 5, a plurality of cells 1, 1 provided in a service area
2, 3,... Respectively have base stations B1, B2, B3,
Are provided, and each base station B1, B2, B3,.
Have different spreading codes C1, C2, C3,.
Is assigned. Then, the base station of each cell always transmits the perch channel spread with the assigned spreading code.
【０００４】そして、今、図５に示すように、セル１内
においてその基地局Ｂ１と無線回線９１を介して通信し
ている移動局Ｍ１が矢印９２で示す方向に移動して、別
のセル２または３内に移るような場合には、移動局Ｍ１
は通信中の基地局Ｂ１との通信レベルが徐々に低下して
くるため、該移動局Ｍ１は基地局Ｂ１との通信をセル２
の基地局Ｂ２またはセル３の基地局Ｂ３等との通信に切
り替える必要がある。As shown in FIG. 5, a mobile station M1 communicating with its base station B1 via a radio line 91 in a cell 1 moves in the direction shown by an arrow 92, and In the case of moving within 2 or 3, the mobile station M1
Since the communication level with the base station B1 during communication gradually decreases, the mobile station M1 performs communication with the base station B1 in cell 2
It is necessary to switch to communication with the base station B2 of the cell 3, the base station B3 of the cell 3, and the like.
【０００５】従って、このような切り替え、すなわちハ
ンドオーバを行うために、従来のシステムにおいては、
移動局は通信中の基地局から周辺セルの拡散符号を受け
取り、この拡散符号で拡散されたパイロットチャネルま
たは止まり木チャネルの受信レベルを順次スキャンし、
この受信レベルが所定のしきい値以上あるセルを選択
し、この選択したセルの通信チャネルを新たに接続し
て、該セルの基地局と同時通信モードに入るとともに、
今まで通信中のセルからの受信レベルを測定し、この受
信レベルが所定の低いしきい値以下に低下すると、該セ
ルとの通信回線を切断するという動作を行っている。Therefore, in order to perform such switching, that is, handover, in a conventional system,
The mobile station receives the spreading code of the neighboring cell from the communicating base station, sequentially scans the reception level of the pilot channel or the perch channel spread with the spreading code,
A cell whose reception level is equal to or higher than a predetermined threshold is selected, a communication channel of the selected cell is newly connected, and a simultaneous communication mode is established with the base station of the cell,
The reception level from the cell currently communicating is measured, and when the reception level falls below a predetermined low threshold value, an operation of disconnecting the communication line with the cell is performed.
【０００６】[0006]
【発明が解決しようとする課題】ところで、ＣＤＭＡ方
式の移動通信方式においては、すべてのセルにおいて周
波数を同一とし、この周波数を拡散符号で分割したもの
をキャリアとして使用しているものである。そして、各
セルは、同一周波数で変調され、それぞれ異なって割り
当てられた独自の拡散符号で拡散され、送信電力制御を
行わない送信電力一定の止まり木チャネルを常時送信
し、この止まり木チャネルをセル判定用に使用するとと
もに、また通常の通信チャネル等も同じように拡散符号
を使用しているものであり、各拡散符号は互いに無相関
でなく、相互相関を有し、これが受信レベルに雑音とし
て上乗せされている。By the way, in the mobile communication system of the CDMA system, the frequency is the same in all cells, and the frequency divided by a spreading code is used as a carrier. Then, each cell is modulated at the same frequency, spread with a unique spreading code assigned differently, and constantly transmits a perch channel having a fixed transmission power without performing transmission power control, and this perch channel is referred to as a cell. In addition to being used for determination, ordinary communication channels and the like also use spreading codes in the same way, and each spreading code has no cross-correlation with each other, but has cross-correlation. Has been added.
【０００７】このように受信レベルに上乗せされる雑音
としては、詳細には、他の拡散符号からの相互相関によ
る雑音、拡散符号は複数のセルからなる１つのサービス
エリア内ではすべて異なっているが、サービスエリア外
では繰り返し使用されているので、この自己の拡散符号
の繰り返し利用による雑音、そして熱雑音等が含まれ
る。[0007] The noise added to the reception level as described above is, specifically, noise due to cross-correlation from other spreading codes, and the spreading codes are all different within one service area including a plurality of cells. Since it is repeatedly used outside the service area, it includes noise due to the repeated use of its own spreading code, thermal noise, and the like.
【０００８】図６は、例えばある拡散符号Ｃ１で同期を
とろうとして相関器にかけた場合の特性を示している
が、同図（ａ）に示すように、拡散符号Ｃ１の受信レベ
ルは斜線で示す前記雑音、すなわち拡散符号Ｃ１に対し
て他の拡散符号Ｃ２，Ｃ３，・・・等からの相互干渉に
よる雑音等により上げ底されて増大している。FIG. 6 shows the characteristics when, for example, the correlation is applied to a certain spread code C1 in an attempt to synchronize, the reception level of the spread code C1 is indicated by oblique lines as shown in FIG. The noise shown above, that is, the spreading code C1, is raised and raised by noise due to mutual interference from other spreading codes C2, C3,...
【０００９】従って、図６（ｂ）に示すように、受信レ
ベルが同じに測定されたとしても、右側に示す受信レベ
ルには斜線で示す雑音が左側の受信レベルよりもかなり
大きく加算されているため、同じ受信レベルであるにも
関わらず、この受信レベルを選択した回線の通信品質は
かなり悪くなる。Therefore, as shown in FIG. 6B, even if the reception level is measured in the same way, the noise indicated by the oblique line is added to the reception level shown on the right side considerably more than the reception level on the left side. Therefore, the communication quality of the line on which this reception level is selected is considerably deteriorated even though the reception level is the same.
【００１０】すなわち、上述した従来の方法において
は、干渉レベル等の雑音も一緒に含んだ受信レベルを測
定し、その受信レベルのみで通信すべきセルを選択し、
相互相関等の雑音による分を無視しているため、受信レ
ベルが大きいセルを選択したとしても、実際にはかなり
大きな干渉レベル等の雑音が受信レベルに加算されてお
り、単に受信レベルの大きさのみでセルを選択した場合
には通信品質がかなり悪くなるという問題がある。That is, in the above-described conventional method, a reception level including noise such as an interference level is measured, and a cell to be communicated only at the reception level is selected.
Since the noise due to cross-correlation and the like is ignored, even if a cell with a high reception level is selected, noise such as a considerably large interference level is actually added to the reception level. If only a cell is selected, there is a problem that communication quality is considerably deteriorated.
【００１１】また、上述した従来の方法では、受信レベ
ルが所定のしきい値以上あるセルを接続し、受信レベル
が所定の低いしきい値以下に低下した場合にセルを切断
するという処理では、多くのセルが互いにオーバラップ
している領域において、セルの接続および切断、すなわ
ちハンドオーバのばたつきが比較的頻繁に発生し、この
ための制御が大変になり、制御装置の負荷が増大すると
いう問題がある。Further, in the above-described conventional method, in a process of connecting a cell having a reception level equal to or higher than a predetermined threshold value and disconnecting the cell when the reception level decreases below a predetermined low threshold value, In a region where many cells overlap with each other, the connection and disconnection of cells, that is, handover fluttering occurs relatively frequently, which makes the control difficult and increases the load on the control device. is there.
【００１２】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、受信レベルのみならず、キャ
リア対雑音比の良好なセルを選択することにより通信品
質の向上を図るとともに、ハンドオーバのばたつきを抑
えて制御にかかる負荷を低減した移動通信ハンドオーバ
方法および移動局装置と基地局装置を提供することにあ
る。The present invention has been made in view of the above,
The objective is not only to improve the communication quality by selecting a cell having a good carrier-to-noise ratio, but also to a mobile communication handover that reduces the load on control by suppressing handover flapping, in addition to the reception level. A method and a mobile station apparatus and a base station apparatus are provided.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するた
め、本発明の移動通信ハンドオーバ方法は、複数のセル
の各々に基地局が設けられ、各基地局は同一周波数で変
調され、それぞれ異なって割り当てられた独自の拡散符
号で拡散され、送信電力制御を行わない送信電力一定の
止まり木チャネルを常時送信している符号分割多元接続
方式の移動通信システムにおける移動通信ハンドオーバ
方法であって、移動局は通信中に周辺セルの各々の止ま
り木チャネルの受信レベルを測定し、該受信レベルのう
ち、第１の所定の受信レベルを越える受信レベルにおけ
るキャリア対雑音比を測定し、該キャリア対雑音比が第
１の所定のキャリア対雑音比より大きいセルを新たに移
動局に接続して同時通信モードに入り、移動局における
同時通信中の複数のセルの受信レベルのキャリア対雑音
比が前記第１の所定のキャリア対雑音比より小さい第２
の所定のキャリア対雑音比より小さくなった場合、また
は通信中の受信レベルが前記第１の所定の受信レベルよ
りも小さい第２の所定の受信レベルより小さくなった場
合、当該セルに対する回線を切断することを要旨とす
る。In order to achieve the above object, a mobile communication handover method according to the present invention provides a base station in each of a plurality of cells, each base station being modulated at the same frequency and different from each other. A mobile communication handover method in a code division multiple access mobile communication system which constantly transmits a perch channel having a constant transmission power which is spread with an assigned unique spreading code and does not perform transmission power control, comprising: Measures the reception level of each perch channel of the neighboring cells during communication, and measures the carrier-to-noise ratio at a reception level exceeding a first predetermined reception level among the reception levels. Connect a cell larger than the first predetermined carrier-to-noise ratio to the mobile station, enter the simultaneous communication mode, and perform a plurality of simultaneous communication in the mobile station. Wherein the carrier-to-noise ratio of the received level of the Le first predetermined carrier-to-noise ratio smaller than the first
When the reception level becomes smaller than the predetermined carrier-to-noise ratio, or when the reception level during communication becomes lower than the second predetermined reception level lower than the first predetermined reception level, the line for the cell is disconnected. The point is to do.
【００１４】また、本発明の移動通信ハンドオーバ方法
は、前記受信レベルを測定するステップにおいて、現在
通信中の基地局から周辺セルの拡散符号を通知され、こ
の通知された拡散符号を用いて周辺セルの各々の止まり
木チャネルの受信レベルを測定することを要旨とする。In the mobile communication handover method according to the present invention, in the step of measuring the reception level, a spreading code of a neighboring cell is notified from a base station currently in communication, and the notified spreading code is used by using the notified spreading code. The point is to measure the reception level of each perch channel.
【００１５】更に、本発明の移動局装置は、複数のセル
の各々に基地局が設けられ、各基地局は同一周波数で変
調され、それぞれ異なって割り当てられた独自の拡散符
号で拡散され、送信電力制御を行わない送信電力一定の
止まり木チャネルを常時送信している符号分割多元接続
方式の移動通信システムにおける移動局装置であって、
通信中に周辺セルの各々の止まり木チャネルの受信レベ
ルを測定する測定手段と、該測定手段で測定した受信レ
ベルのうち、第１の所定の受信レベルを越える受信レベ
ルにおけるキャリア対雑音比を測定し、該キャリア対雑
音比が第１の所定のキャリア対雑音比よりも大きいセル
を検出する第１の検出手段と、同時通信中の複数のセル
の受信レベルのキャリア対雑音比が前記第１の所定のキ
ャリア対雑音比よりも小さい第２の所定のキャリア対雑
音比よりも小さくなったセル、または同時通信中の受信
レベルが前記第１の所定の受信レベルよりも小さい第２
の所定の受信レベルよりも小さくなったセルを検出する
第２の検出手段とを有することを要旨とする。Further, in the mobile station apparatus according to the present invention, a base station is provided in each of a plurality of cells, each base station is modulated at the same frequency, spread with a unique spreading code assigned differently, and transmitted. A mobile station device in a mobile communication system of a code division multiple access system that constantly transmits a perch channel having a constant transmission power without performing power control,
Measuring means for measuring the reception level of each perch channel of the peripheral cell during communication, and measuring a carrier-to-noise ratio at a reception level exceeding a first predetermined reception level among the reception levels measured by the measurement means A first detecting means for detecting a cell having a carrier-to-noise ratio greater than a first predetermined carrier-to-noise ratio; and a carrier-to-noise ratio of reception levels of a plurality of cells during simultaneous communication. A cell smaller than a second predetermined carrier-to-noise ratio that is smaller than the predetermined carrier-to-noise ratio, or a second cell whose reception level during simultaneous communication is smaller than the first predetermined reception level.
And a second detecting means for detecting a cell whose reception level is lower than the predetermined reception level.
【００１６】本発明の移動局装置は、前記測定手段とし
て、現在通信中の基地局から周辺セルの拡散符号を通知
され、この通知された拡散符号を用いて周辺セルの各々
の止まり木チャネルの受信レベルを測定する手段を有す
ることを要旨とする。In the mobile station apparatus of the present invention, as the measuring means, a spreading code of a neighboring cell is notified from a base station with which communication is currently being performed, and using the notified spreading code, the perch channel of each of the neighboring cells is used. The gist of the invention is to have means for measuring the reception level.
【００１７】また、本発明の移動局装置は、前記第１の
検出手段によって検出されたセルを新たに接続して該セ
ルと同時通信モードに入る同時通信手段を更に有するこ
とを要旨とする。Further, the mobile station apparatus of the present invention further comprises simultaneous communication means for newly connecting a cell detected by the first detection means to enter a simultaneous communication mode with the cell.
【００１８】更に、本発明の移動局装置は、前記第１の
検出手段によって検出されたセルを基地局に通知する通
知手段を更に有し、該通知を受けた基地局は当該セルを
新たに移動局に接続して該セルと同時通信モードに入ら
しめるように制御することを要旨とする。Further, the mobile station apparatus of the present invention further comprises a notifying means for notifying the cell detected by the first detecting means to the base station, and the base station receiving the notification newly adds the cell. The gist of the present invention is to perform control to connect to a mobile station and enter a simultaneous communication mode with the cell.
【００１９】また、本発明の移動局装置は、前記第２の
検出手段で検出されたセルに対する回線を切断する切断
手段を更に有することを要旨とする。Further, the mobile station apparatus of the present invention further comprises a disconnecting means for disconnecting the line for the cell detected by the second detecting means.
【００２０】更に、本発明の移動局装置は、前記第２の
検出手段で検出されたセルを基地局に通知する通知手段
を更に有し、該通知を受けた基地局は当該セルに対する
回線を切断することを要旨とする。Further, the mobile station apparatus of the present invention further comprises a notifying means for notifying the cell detected by the second detecting means to the base station, and the base station receiving the notification changes a line for the cell. The gist is to cut.
【００２１】本発明の基地局装置は、複数のセルの各々
に基地局が設けられ、各基地局は同一周波数で変調さ
れ、それぞれ異なって割り当てられた独自の拡散符号で
拡散され、送信電力制御を行わない送信電力一定の止ま
り木チャネルを常時送信している符号分割多元接続方式
の移動通信システムにおける基地局装置であって、移動
局との通信中に周辺セルの各々の止まり木チャネルの受
信レベルを移動局に測定させて、その測定結果を送信さ
せ、この送信された測定結果を受信する第１の受信手段
と、該第１の受信手段で受信した受信レベルのうち、第
１の所定の受信レベルを越える受信レベルについてキャ
リア対雑音比を移動局に測定させ、この測定されたキャ
リア対雑音比を基地局に送信させ、この送信されたキャ
リア対雑音比を受信するキャリア対雑音比受信手段と、
該キャリア対雑音比受信手段で受信したキャリア対雑音
比が第１の所定のキャリア対雑音比より大きいセルを検
出する第１の検出手段と、同時通信中の複数のセルの受
信レベルのキャリア対雑音比を移動局に測定させて、そ
の測定結果を送信させ、この送信した測定結果を受信す
る第２の受信手段と、該第２の受信手段で受信した同時
通信中の複数のセルの受信レベルのキャリア対雑音比が
前記第１の所定のキャリア対雑音比よりも小さい第２の
キャリア対雑音比より小さくなったセル、または同時通
信中の受信レベルが前記第１の所定の受信レベルよりも
小さい第２の所定の受信レベルよりも小さくなったセル
を検出する第２の検出手段とを有することを要旨とす
る。In the base station apparatus of the present invention, a base station is provided in each of a plurality of cells, each base station is modulated at the same frequency, spread with a unique spreading code assigned differently, and transmitted power control is performed. A base station apparatus in a code division multiple access mobile communication system that constantly transmits a fixed perch channel having a constant transmission power, and receives each perch channel of a peripheral cell during communication with the mobile station. A first receiving means for causing the mobile station to measure the level, transmitting the measurement result, and receiving the transmitted measurement result; and a first predetermined level among the reception levels received by the first receiving means. The mobile station measures the carrier-to-noise ratio for the reception level exceeding the reception level of the mobile station, transmits the measured carrier-to-noise ratio to the base station, and receives the transmitted carrier-to-noise ratio. And the carrier-to-noise ratio receiving unit that,
First detecting means for detecting a cell having a carrier-to-noise ratio greater than a first predetermined carrier-to-noise ratio received by the carrier-to-noise ratio receiving means; A second receiving means for causing the mobile station to measure the noise ratio, transmitting the measurement result, and receiving the transmitted measurement result, and receiving the plurality of cells in the simultaneous communication received by the second receiving means. A cell in which a carrier-to-noise ratio of a level is smaller than a second carrier-to-noise ratio that is smaller than the first predetermined carrier-to-noise ratio, or a reception level during simultaneous communication is higher than the first predetermined reception level. And a second detecting means for detecting a cell which has become smaller than a second predetermined reception level.
【００２２】また、本発明の基地局装置は、前記第１の
受信手段として、周辺セルの拡散符号を移動局に通知
し、移動局はこの通知された拡散符号を用いて周辺セル
の各々の止まり木チャネルの受信レベルを測定する測定
手段を有することを要旨とする。Further, the base station apparatus of the present invention, as the first receiving means, notifies a spreading code of a neighboring cell to a mobile station, and the mobile station uses each of the notified spreading codes to notify each of the surrounding cells. The gist of the present invention is to have a measuring means for measuring the reception level of the perch channel.
【００２３】更に、本発明の基地局装置は、前記第１の
検出手段で検出されたセルを新たに移動局に接続して同
時通信モードに入らしめる同時通信手段を更に有するこ
とを要旨とする。Further, the gist of the present invention is that the base station apparatus of the present invention further comprises simultaneous communication means for newly connecting the cell detected by the first detection means to the mobile station to enter the simultaneous communication mode. .
【００２４】本発明の基地局装置は、前記第１の検出手
段で検出されたセルを移動局に通知する通知手段を更に
有し、該通知を受けた移動局は当該セルを新たに接続し
て該セルと同時通信モードに入るように制御することを
要旨とする。[0024] The base station apparatus of the present invention further comprises a notifying means for notifying the mobile station of the cell detected by the first detecting means, and the mobile station receiving the notification newly connects the cell. The point is to control to enter the simultaneous communication mode with the cell.
【００２５】更に、本発明の基地局装置は、前記第２の
検出手段で検出されたセルに対する回線を切断する切断
手段を更に有することを要旨とする。Further, the gist of the present invention is that the base station apparatus further comprises a disconnecting means for disconnecting the line to the cell detected by the second detecting means.
【００２６】本発明の基地局装置は、前記第２の検出手
段で検出されたセルを移動局に通知する通知手段を更に
有し、該通知を受けた移動局は当該セルに対する回線を
切断することを要旨とする。The base station apparatus according to the present invention further comprises a notifying means for notifying the mobile station of the cell detected by the second detecting means, and the mobile station having received the notification disconnects the line for the cell. That is the gist.
【００２７】[0027]
【作用】本発明の移動通信ハンドオーバ方法では、移動
局は通信中に測定した周辺セルの止まり木チャネルの受
信レベルのうち、第１の所定の受信レベルを越える受信
レベルにおけるキャリア対雑音比を測定し、該キャリア
対雑音比が第１の所定のキャリア対雑音比より大きいセ
ルを新たに移動局に接続して同時通信モードに入り、同
時通信中の複数のセルの受信レベルのキャリア対雑音比
が前記第１の所定のキャリア対雑音比より小さい第２の
所定のキャリア対雑音比より小さくなった場合、または
同時通信中の受信レベルが前記第１の所定の受信レベル
よりも小さい第２の所定の受信レベルより小さくなった
場合、当該セルに対する回線を切断する。In the mobile communication handover method according to the present invention, the mobile station measures the carrier-to-noise ratio at a reception level exceeding a first predetermined reception level among the reception levels of the perch channels of the neighboring cells measured during communication. Then, a cell whose carrier-to-noise ratio is larger than the first predetermined carrier-to-noise ratio is newly connected to the mobile station to enter the simultaneous communication mode, and the carrier-to-noise ratio of the reception level of a plurality of cells during simultaneous communication is set. Is smaller than a second predetermined carrier-to-noise ratio that is smaller than the first predetermined carrier-to-noise ratio, or a second reception level during simultaneous communication that is lower than the first predetermined reception level. When the reception level becomes lower than the predetermined reception level, the line for the cell is disconnected.
【００２８】また、本発明の移動通信ハンドオーバ方法
では、前記において、通信中の基地局から周辺セルの拡
散符号を通知され、この拡散符号を用いて周辺セルの各
々の止まり木チャネルの受信レベルを測定する。Further, in the mobile communication handover method of the present invention, in the above, the spreading code of the neighboring cell is notified from the communicating base station, and the received level of each perch channel of the neighboring cell is determined using the spreading code. Measure.
【００２９】更に、本発明の移動局装置では、通信中に
測定した周辺セルの止まり木チャネルの受信レベルのう
ち、第１の所定の受信レベルを越える受信レベルにおけ
るキャリア対雑音比を測定し、該キャリア対雑音比が第
１の所定のキャリア対雑音比よりも大きいセルを検出
し、同時通信中の複数のセルの受信レベルのキャリア対
雑音比が第１の所定のキャリア対雑音比よりも小さい第
２の所定のキャリア対雑音比よりも小さくなったセル、
または同時通信中の受信レベルが第１の所定の受信レベ
ルよりも小さい第２の所定の受信レベルよりも小さくな
ったセルを検出する。Further, the mobile station apparatus of the present invention measures a carrier-to-noise ratio at a reception level exceeding a first predetermined reception level among the reception levels of the perch channels of the neighboring cells measured during communication, A cell having the carrier-to-noise ratio greater than a first predetermined carrier-to-noise ratio is detected, and the carrier-to-noise ratio of the reception levels of the plurality of cells during simultaneous communication is higher than the first predetermined carrier-to-noise ratio. A cell that has become smaller than a small second predetermined carrier-to-noise ratio;
Alternatively, a cell whose reception level during simultaneous communication is lower than a second predetermined reception level, which is lower than the first predetermined reception level, is detected.
【００３０】本発明の移動局装置では、前記において、
通信中の基地局から周辺セルの拡散符号を通知され、こ
の拡散符号を用いて周辺セルの各々の止まり木チャネル
の受信レベルを測定する。In the mobile station device of the present invention,
The spreading code of the neighboring cell is notified from the base station in communication, and the received level of each perch channel of the neighboring cell is measured using the spreading code.
【００３１】また、本発明の移動局装置では、前記第１
の検出手段によって検出されたセルを新たに接続して該
セルと同時通信モードに入る。Further, in the mobile station apparatus according to the present invention, the first station
The cell newly detected by the detecting means is newly connected to enter the simultaneous communication mode with the cell.
【００３２】更に、本発明の移動局装置は、前記第１の
検出手段によって検出されたセルを基地局に通知し、該
通知を受けた基地局は当該セルを新たに移動局に接続し
て該セルと同時通信モードに入らしめるように制御す
る。Further, the mobile station apparatus of the present invention notifies the cell detected by the first detecting means to the base station, and the base station having received the notification newly connects the cell to the mobile station. Control is performed so as to enter the simultaneous communication mode with the cell.
【００３３】また、本発明の移動局装置では、更に、前
記第２の検出手段で検出されたセルに対する回線を切断
する。Further, in the mobile station apparatus of the present invention, the line for the cell detected by the second detecting means is disconnected.
【００３４】更に、本発明の移動局装置では、前記第２
の検出手段で検出されたセルを基地局に通知し、該通知
を受けた基地局は当該セルに対する回線を切断する。Further, in the mobile station apparatus of the present invention, the second station
The cell detected by the detecting means is notified to the base station, and the base station receiving the notification disconnects the line for the cell.
【００３５】本発明の基地局装置では、移動局との通信
中に周辺セルの止まり木チャネルの受信レベルを移動局
に測定させ、その受信レベルのうち、第１の所定の受信
レベルを越える受信レベルについてキャリア対雑音比を
移動局に測定させ、このキャリア対雑音比が第１の所定
のキャリア対雑音比より大きいセルを検出し、同時通信
中の複数のセルの受信レベルのキャリア対雑音比を移動
局に測定させ、そのキャリア対雑音比が第１の所定のキ
ャリア対雑音比よりも小さい第２のキャリア対雑音比よ
り小さくなったセル、または同時通信中の受信レベルが
第１の所定の受信レベルよりも小さい第２の所定の受信
レベルよりも小さくなったセルを検出する。In the base station apparatus of the present invention, the mobile station measures the reception level of the perch channel of the neighboring cell during communication with the mobile station, and the reception level exceeding the first predetermined reception level among the reception levels. The mobile station measures the carrier-to-noise ratio for the level, detects cells whose carrier-to-noise ratio is greater than a first predetermined carrier-to-noise ratio, and detects the carrier-to-noise ratio of the reception levels of a plurality of cells during simultaneous communication. And the cell whose carrier-to-noise ratio is smaller than a second predetermined carrier-to-noise ratio is smaller than a first predetermined carrier-to-noise ratio, or the reception level during simultaneous communication is the first predetermined value. And detects a cell that has become lower than a second predetermined reception level that is lower than the reception level of the second cell.
【００３６】また、本発明の基地局装置では、前記にお
いて、周辺セルの拡散符号を移動局に通知し、移動局は
この拡散符号を用いて周辺セルの止まり木チャネルの受
信レベルを測定する。Further, in the base station apparatus according to the present invention, in the above, the spreading code of the neighboring cell is notified to the mobile station, and the mobile station measures the reception level of the perch channel of the neighboring cell using the spreading code.
【００３７】更に、本発明の基地局装置では、前記第１
の検出手段で検出されたセルを新たに移動局に接続して
同時通信モードに入らしめる。Further, in the base station apparatus of the present invention, the first
The cell detected by the detecting means is newly connected to the mobile station to enter the simultaneous communication mode.
【００３８】本発明の基地局装置では、前記第１の検出
手段で検出されたセルを移動局に通知し、該通知を受け
た移動局は当該セルを新たに接続して該セルと同時通信
モードに入るように制御する。In the base station apparatus according to the present invention, the cell detected by the first detecting means is notified to the mobile station, and the mobile station receiving the notification newly connects the cell to perform simultaneous communication with the cell. Control to enter the mode.
【００３９】更に、本発明の基地局装置では、前記第２
の検出手段で検出されたセルに対する回線を切断する。Further, in the base station apparatus of the present invention, the second station
The line for the cell detected by the detecting means is disconnected.
【００４０】本発明の基地局装置では、更に、前記第２
の検出手段で検出されたセルを移動局に通知し、該通知
を受けた移動局は当該セルに対する回線を切断する。In the base station apparatus according to the present invention, the second
And notifies the mobile station of the cell detected by the detecting means, and the mobile station receiving the notification disconnects the line for the cell.
【００４１】[0041]
【実施例】以下、図面を用いて本発明の実施例を説明す
る。図１は、本発明の一実施例に係わる移動通信ハンド
オーバ方法の処理手順を示すフローチャートである。同
図に示す移動通信ハンドオーバ方法は、スペクトル拡散
符号を用いたＣＤＭＡ方式の移動通信システムにおいて
移動局が現在通信中のセルから他のセルに移る場合に必
要となるハンドオーバ処理を実施するものである。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a processing procedure of a mobile communication handover method according to one embodiment of the present invention. The mobile communication handover method shown in FIG. 1 performs a handover process required when a mobile station moves from a currently communicating cell to another cell in a CDMA mobile communication system using a spread spectrum code. .
【００４２】本実施例の移動通信ハンドオーバ方法で
は、通信すべきセルを選択するのに、各セルの基地局が
常時送信している止まり木チャネル、すなわち同一周波
数で変調され、それぞれ異なって割り当てられた独自の
拡散符号で拡散され、送信電力制御を行わない送信電力
一定の止まり木チャネルの受信レベルを測定し、この受
信レベルが第１の所定の受信レベルＲ１より大きいとい
う条件に加えて、図６に関連して説明したように各セル
から受信した止まり木チャネルの受信レベルは相互干渉
等による雑音が上乗せされて増大しているので、この相
互干渉等による雑音、具体的には他の拡散符号からの相
互相関による雑音、自己の拡散符号の繰り返し利用によ
る雑音、および熱雑音等を含む雑音を考慮し、この雑音
とキャリアとの比、すなわちキャリア対雑音比（以下、
ＣＮＲと略称する）も算出し、このＣＮＲが第１の所定
のＣＮＲ１よりも大きいセルを選択し、このセルと同時
通信モードに入ってから、更に所定の条件のもとに先に
通信中のセルとの回線を切断し、ハンドオーバを行うよ
うになっている。In the mobile communication handover method of the present embodiment, a cell to be communicated with is selected by a perch channel constantly transmitted by the base station of each cell, that is, modulated by the same frequency and assigned differently. The reception level of the perch channel, which is spread with the unique spreading code and does not perform transmission power control and has a constant transmission power, is measured. In addition to the condition that this reception level is higher than the first predetermined reception level R1, FIG. As described in connection with No. 6, the reception level of the perch channel received from each cell is increasing due to the addition of noise due to mutual interference and the like. Considering noise due to cross-correlation from the code, noise due to repeated use of its own spreading code, and noise including thermal noise, the ratio of this noise to the carrier, Ie carrier-to-noise ratio (hereinafter,
CNR) is also calculated, a cell whose CNR is larger than the first predetermined CNR1 is selected, and after entering the simultaneous communication mode with this cell, the cell which is being communicated first under the predetermined condition is further determined. The line with the cell is disconnected and handover is performed.
【００４３】このように受信レベルに加えて、ＣＮＲも
考慮することにより、例えば図６（ｂ）に示すように受
信レベルが同じ左右の信号においても斜線部分で示す相
互干渉等による雑音の小さな左側の信号のセルが選択さ
れることになる。すなわち、図６（ｂ）では、斜線部分
で示す相互干渉等による雑音の小さい左側の信号のＣＮ
Ｒの方が雑音の大きい右側の信号のＣＮＲよりも大きい
ので、左側の信号のセルが選択されることになる。As described above, by considering the CNR in addition to the reception level, for example, as shown in FIG. 6B, even the left and right signals having the same reception level have a small left side of noise due to mutual interference and the like indicated by oblique lines. Will be selected. That is, in FIG. 6B, the CN of the left signal with small noise due to mutual interference and the like indicated by the hatched portion is shown.
Since R is larger than the CNR of the right signal with much noise, the cell of the left signal is selected.
【００４４】図２は、図１の移動通信ハンドオーバ方法
を実施する移動局送受信部１０および基地局２０の構成
を示すブロック図である。移動局送受信部１０は、基地
局２０と通信を行うためのアンテナ１１、該アンテナ１
１に送受切替器１２を介して接続されている送信回路部
１３および受信回路部１４、該送信回路部１３と受信回
路部１４に接続された制御部１５、および受信回路部１
４で受信した止まり木チャネルの受信レベルおよび該受
信レベルに含まれる上述した相互干渉等による雑音に相
当する干渉レベルを測定する受信レベル・干渉レベル検
出部１６を有する。前記制御部１５は、該受信レベル・
干渉レベル検出部１６で検出された受信レベルおよび干
渉レベルに基づいて前記ＣＮＲを算出するようになって
いる。FIG. 2 is a block diagram showing the configurations of the mobile station transmitting / receiving section 10 and the base station 20 for implementing the mobile communication handover method of FIG. The mobile station transmitting / receiving unit 10 includes an antenna 11 for communicating with the base station 20,
1, a transmission circuit unit 13 and a reception circuit unit 14 connected via a transmission / reception switch 12, a control unit 15 connected to the transmission circuit unit 13 and the reception circuit unit 14, and a reception circuit unit 1.
4 has a reception level / interference level detection unit 16 for measuring the reception level of the perch channel received in step 4 and an interference level included in the reception level and corresponding to noise due to the above-described mutual interference. The control unit 15 controls the reception level
The CNR is calculated based on the reception level and the interference level detected by the interference level detection unit 16.
【００４５】また、前記受信レベル・干渉レベル検出部
１６は、相関検出器１７、レベル検出器１８、および干
渉検出器１９から構成されているが、この受信レベル・
干渉レベル検出器１６においては、各セルの基地局から
の止まり木チャネルをアンテナ１１および送受切替器１
２を介して受信回路部１４で受信した出力信号が相関検
出器１７に供給される。相関検出器１７は、制御部１５
から指示された止まり木チャネルのレベル監視用拡散符
号との相関検出を順次行い、相関検出器１７で得られた
タイミングによって受信回路部１４の出力信号を対応レ
ベル監視用拡散符号で逆拡散する。この逆拡散によって
得られたパワースペクトラムをレベル検出器１８および
干渉検出器１９に供給し、それぞれにおいて受信レベル
の測定および干渉レベルの測定が行われる。そして、こ
の得られた受信レベルおよび干渉レベルは制御部１５に
供給され、制御部１５において受信レベルおよび干渉レ
ベルからキャリア対雑音比、すなわちＣＮＲが算出され
る。このＣＮＲは後述する図１に示すフローチャートの
処理に使用され、このＣＮＲに基づいて最適なセルが選
択されることになる。The reception level / interference level detector 16 comprises a correlation detector 17, a level detector 18, and an interference detector 19.
In the interference level detector 16, the perch channel from the base station of each cell is transmitted to the antenna 11 and the duplexer 1.
The output signal received by the receiving circuit unit 14 via the second circuit 2 is supplied to the correlation detector 17. The correlation detector 17 includes a controller 15
The correlation detection with the level monitoring spreading code of the perch channel designated by the above is sequentially performed, and the output signal of the receiving circuit unit 14 is despread with the corresponding level monitoring spreading code at the timing obtained by the correlation detector 17. The power spectrum obtained by this despreading is supplied to a level detector 18 and an interference detector 19, where the measurement of the reception level and the measurement of the interference level are performed. Then, the obtained reception level and interference level are supplied to the control unit 15, and the control unit 15 calculates a carrier-to-noise ratio, that is, a CNR from the reception level and the interference level. This CNR is used in the processing of the flowchart shown in FIG. 1 described later, and an optimal cell is selected based on the CNR.
【００４６】また、図２に示す基地局２０においては、
移動局送受信部１０と通信を行うアンテナ２１が接続さ
れている基地局増幅器２６は変復調装置２７に接続さ
れ、該変復調装置２７は拡散装置２８に接続されてい
る。また、変復調装置２７には制御バスコントロール３
０、監視制御装置３１、２Ｍ／１．５Ｍインタフェース
装置３２、基地局制御装置３３およびタイミング供給装
置３４が接続されている。In the base station 20 shown in FIG.
The base station amplifier 26 to which the antenna 21 for communicating with the mobile station transmitting / receiving unit 10 is connected is connected to a modulation / demodulation device 27, which is connected to a spreading device 28. The modulation / demodulation device 27 has a control bus control 3
0, a supervisory control device 31, a 2M / 1.5M interface device 32, a base station control device 33, and a timing supply device 34.
【００４７】このように構成される基地局２０において
生成された止まり木チャネル用の送信データは拡散装置
２８でレベル監視用拡散符号によって拡散され、更に変
復調装置２７によって搬送波信号に乗せられる。そし
て、変復調装置２７の変調出力信号は基地局増幅器２６
によって増幅され、アンテナ２１から電波として送信さ
れる。なお、図２において、基地局２０は送信系の回路
構成のみ示し、受信系の回路構成は示していないが、受
信系の回路構成は通常の周知のものであるので、図示を
省略している。The transmission data for the perch channel generated in the base station 20 configured as described above is spread by the spreading code for level monitoring in the spreading device 28, and further added to the carrier signal by the modem 27. The modulation output signal of the modem 27 is transmitted to the base station amplifier 26.
And transmitted as a radio wave from the antenna 21. In FIG. 2, the base station 20 shows only the circuit configuration of the transmission system and does not show the circuit configuration of the reception system. However, since the circuit configuration of the reception system is an ordinary well-known one, it is not shown. .
【００４８】次に、図１に示すフローチャートを参照し
て、移動通信ハンドオーバ方法の処理手順について説明
する。Next, the processing procedure of the mobile communication handover method will be described with reference to the flowchart shown in FIG.
【００４９】図１において、移動局は通信中の基地局か
ら周辺セルの拡散符号を通知され、該拡散符号を用いて
周辺セルの止まり木チャネルを順次受信し、その受信レ
ベルＲを測定する（ステップ１１０）。具体的には、前
記拡散符号で基地局からの止まり木チャネルの拡散符号
を逆拡散して、その受信レベルＲを測定する。In FIG. 1, the mobile station is notified of the spreading code of the neighboring cell from the communicating base station, sequentially receives the perch channels of the neighboring cell using the spreading code, and measures the reception level R thereof ( Step 110). Specifically, the spreading code of the perch channel from the base station is despread with the spreading code, and the reception level R is measured.
【００５０】そして、この測定した受信レベルＲのう
ち、第１の所定の受信レベルＲ１を越える受信レベルＲ
のキャリア対雑音比、すなわちＣＮＲ’を測定する（ス
テップ１２０）。この測定したＣＮＲ’が第１の所定の
ＣＮＲ１より大きいセルを新たに接続し、同時通信モー
ドに入る（ステップ１３０）。Then, of the measured reception levels R, the reception level R exceeding the first predetermined reception level R1
Is measured, that is, CNR ′ (step 120). The cell whose measured CNR ′ is larger than the first predetermined CNR1 is newly connected, and the simultaneous communication mode is entered (step 130).
【００５１】以上の関係を図３を参照して説明する。図
３（ａ），（ｂ），（ｃ）は、それぞれ移動局ＭＳがセ
ルＡからセルＢに移動する場合のセルと移動局との位置
的関係、受信レベル、およびＣＮＲを示す説明図であ
る。図３（ａ）に示すように、基地局ＢＳａ，ＢＳｂを
それぞれ有する隣接した２つのセルＡ，Ｂのうちの一方
のセルＡ内に存在している移動局ＭＳが矢印９１で示す
ように点線９３に沿って右方にセルＡからセルＢに向か
って移動しつつある場合、移動局ＭＳが移動するにつれ
て基地局ＢＳａおよびＢＳｂから受信する止まり木チャ
ネルの受信レベルＲは図３（ｂ）のように変化する。す
なわち、図３（ｂ）は縦軸に受信レベルＲを示し、横軸
に前記点線９３に沿った移動局ＭＳの位置Ｐを示し、図
３（ｂ）においてＲａは移動局ＭＳが基地局ＢＳａから
受信する止まり木チャネルの受信レベルを示し、この受
信レベルＲａは移動局ＭＳが基地局ＢＳａに最も近づい
た時に最も大きくなり、基地局ＢＳａから離れるに従っ
て小さくなる。また、Ｒｂは移動局ＭＳが基地局ＢＳｂ
から受信する止まり木チャネルの受信レベルを同様に示
している。The above relationship will be described with reference to FIG. FIGS. 3A, 3B, and 3C are explanatory diagrams showing the positional relationship between the cell and the mobile station, the reception level, and the CNR when the mobile station MS moves from the cell A to the cell B, respectively. is there. As shown in FIG. 3A, a mobile station MS existing in one cell A of two adjacent cells A and B having base stations BSa and BSb, respectively, is indicated by a dotted line as indicated by an arrow 91. When moving from cell A to cell B to the right along 93, the reception level R of the perch channel received from the base stations BSa and BSb as the mobile station MS moves is shown in FIG. To change. That is, FIG. 3B shows the reception level R on the vertical axis, and the position P of the mobile station MS along the dotted line 93 on the horizontal axis. In FIG. 3B, Ra indicates that the mobile station MS is the base station BSa. , The reception level of the perch channel received from the base station BS. The reception level Ra becomes maximum when the mobile station MS comes closest to the base station BSa, and becomes smaller as the mobile station MS moves away from the base station BSa. Rb indicates that the mobile station MS is the base station BSb
Similarly, the reception level of the perch channel received from.
【００５２】最初、セルＡ内に存在し、基地局ＢＳａと
通信中の移動局ＭＳが矢印９１で示すように点線９３に
沿って移動している場合、移動局ＭＳは基地局ＢＳａか
ら通知された周辺セルであるセルＢの基地局ＢＳｂなど
から常に送信されている止まり木チャネルを受信すべく
常に探索している。移動局ＭＳがセルＡの中央付近にい
る場合には移動局ＭＳは基地局ＢＳｂからの止まり木チ
ャネルをまだ受信することはできないが、移動局ＭＳが
セルＡの中央から離れて周辺近くの位置Ｐ１０に来る
と、図３（ｂ）のＲｂで示すようにセルＢの基地局ＢＳ
ｂからの止まり木チャネルを受信可能になる。しかしな
がら、この位置Ｐ１０における受信レベルＲｂは図３
（ｂ）において点線で示す前記第１の所定の受信レベル
Ｒ１以下である。移動局ＭＳが更にセルＢ寄りに移動
し、位置Ｐ１１に至ると、セルＢの基地局ＢＳｂからの
受信レベルＲｂが第１の所定の受信レベルＲ１以上にな
る。First, when the mobile station MS existing in the cell A and communicating with the base station BSa moves along the dotted line 93 as indicated by an arrow 91, the mobile station MS is notified from the base station BSa. It is constantly searching to receive a perch channel constantly transmitted from the base station BSb of the cell B which is a neighboring cell. When the mobile station MS is near the center of the cell A, the mobile station MS cannot yet receive the perch channel from the base station BSb, but the mobile station MS is located near the periphery away from the center of the cell A. At P10, as indicated by Rb in FIG.
The perch channel from b can be received. However, the reception level Rb at this position P10 is
In (b), the reception level is equal to or lower than the first predetermined reception level R1 indicated by a dotted line. When the mobile station MS further moves closer to the cell B and reaches the position P11, the reception level Rb of the cell B from the base station BSb becomes equal to or higher than the first predetermined reception level R1.
【００５３】移動局ＭＳは、第１の所定の受信レベルＲ
１以上の受信レベルＲｂを検出すると、この受信レベル
ＲｂのＣＮＲ’を測定する。そして、この測定したＣＮ
Ｒ’が図３（ｃ）に示すように第１の所定のＣＮＲ１よ
りも大きい場合には、移動局ＭＳはこのＣＮＲ’の大き
いセルＢの基地局ＢＳｂを新たに接続し、該基地局ＢＳ
ｂと同時通信モードに入ることになる。The mobile station MS has a first predetermined reception level R
When one or more reception levels Rb are detected, the CNR 'of this reception level Rb is measured. And this measured CN
When R 'is larger than the first predetermined CNR1 as shown in FIG. 3 (c), the mobile station MS newly connects the base station BSb of the cell B with the larger CNR', and the base station BS
It will enter the simultaneous communication mode with b.
【００５４】図１に戻って、以上のようにして同時通信
モードに入った移動局は、同時通信中の複数のセルのＣ
ＮＲ”を常に測定し、そのＣＮＲ”が前記第１の所定の
ＣＮＲ１よりも小さい第２の所定のＣＮＲ２よりも小さ
いか否かを判定する（ステップ１４０）。この結果、Ｃ
ＮＲ”が第２の所定のＣＮＲ２よりも小さくなった場合
には、このＣＮＲ”を有するセルに対する通信回線を切
断する（ステップ１６０）。Returning to FIG. 1, the mobile station that has entered the simultaneous communication mode as described above receives Cs of a plurality of cells performing simultaneous communication.
NR "is constantly measured, and it is determined whether or not the CNR" is smaller than the second predetermined CNR2 which is smaller than the first predetermined CNR1 (step 140). As a result, C
If NR "becomes smaller than the second predetermined CNR2, the communication line for the cell having this CNR" is disconnected (step 160).
【００５５】図３を参照して、更に具体的に説明する
と、図３において位置Ｐ１１でセルＢの基地局ＢＳｂが
新たに接続された場合において、移動局ＭＳはセルＡの
基地局ＢＳａおよびセルＢの基地局ＢＳｂと同時通信モ
ードにあり、セルＡおよびセルＢの各受信レベルのＣＮ
Ｒ”を常に監視する。この状態で移動局ＭＳが更に移動
すると、図３（ｂ）に示すようにセルＢからの受信レベ
ルＲｂは徐々に増大し、そのＣＮＲ”は大きくなるのに
対して、セルＡからの受信レベルＲａは徐々に低下し、
そのＣＮＲ”は小さくなる。この結果、移動局ＭＳが位
置Ｐ１２まで移動した場合に、セルＡからの受信レベル
ＲａのＣＮＲ”が前記第２の所定のＣＮＲ２よりも小さ
くなると、このＣＮＲ”を有するセル、すなわちセルＡ
に対する通信回線が切断されることになる。More specifically, referring to FIG. 3, when the base station BSb of the cell B is newly connected at the position P11 in FIG. B in the simultaneous communication mode with the base station BSb of each cell A and the CN of each reception level of the cell A and the cell B.
R "is constantly monitored. If the mobile station MS moves further in this state, the reception level Rb from the cell B gradually increases as shown in FIG. 3B, while its CNR" increases. , The reception level Ra from the cell A gradually decreases,
As a result, when the mobile station MS moves to the position P12 and the CNR "of the reception level Ra from the cell A becomes smaller than the second predetermined CNR2, the CNR" becomes smaller. Cell, cell A
Will be disconnected.
【００５６】また、図１に戻って、ステップ１４０での
判定の結果、ＣＮＲ”が第２の所定のＣＮＲ２よりも小
さくない場合には、ステップ１５０に進んで、同時通信
中のセルの受信レベルＲが前記第１の所定の受信レベル
Ｒ１よりも小さい第２の所定の受信レベルＲ２よりも小
さいか否かを判定する。受信レベルＲが第２の所定の受
信レベルＲ２よりも小さくない場合には、ステップ１４
０に戻り、同様の処理を繰り返すが、小さい場合には、
該セルに対する回線を切断する（ステップ１６０）。な
お、この第２の受信レベルＲ２を使用した判定は、主と
して受信レベルが小さいものに対して行われるものであ
る。Returning to FIG. 1, if the result of the determination in step 140 is that CNR "is not smaller than the second predetermined CNR2, the operation proceeds to step 150, where the reception level of the cell during simultaneous communication is determined. It is determined whether R is lower than a second predetermined reception level R2 which is lower than the first predetermined reception level R1.If the reception level R is not lower than the second predetermined reception level R2, Is Step 14
Return to 0 and repeat the same process, but if smaller,
The line for the cell is disconnected (step 160). It should be noted that the determination using the second reception level R2 is mainly performed for a signal having a low reception level.
【００５７】次に、図４に示すフローチャートを参照し
て、本発明の他の実施例に係わる移動通信ハンドオーバ
方法を実施する基地局の処理手順について説明する。Next, with reference to a flowchart shown in FIG. 4, a processing procedure of a base station that executes a mobile communication handover method according to another embodiment of the present invention will be described.
【００５８】図４において、基地局は通信中の移動局に
対して周辺セルの拡散符号を通知し、移動局に該拡散符
号を用いて周辺セルの止まり木チャネルを順次受信さ
せ、その受信レベルＲを測定させる（ステップ２１
０）。そして、この移動局で測定した受信レベルＲを送
信させ、基地局で受信する（ステップ２２０）。基地局
は受信した受信レベルＲのうち、第１の所定の受信レベ
ルＲ１より大きい受信レベルＲのＣＮＲ’を移動局に測
定させ（ステップ２３０）、この測定結果を送信させ、
基地局で受信する（ステップ２４０）。この受信したＣ
ＮＲ’が第１の所定のＣＮＲ１よりも大きいセルを新た
に移動局に接続させ、同時通信モードに入る（ステップ
２５０）。In FIG. 4, the base station notifies the mobile station in communication of the spreading code of the neighboring cell, and causes the mobile station to sequentially receive the perch channels of the neighboring cell using the spreading code, R is measured (step 21)
0). Then, the reception level R measured by the mobile station is transmitted and received by the base station (step 220). The base station causes the mobile station to measure a CNR ′ having a reception level R higher than the first predetermined reception level R1 among the received reception levels R (step 230), and transmits the measurement result.
The signal is received by the base station (step 240). This received C
A cell in which NR ′ is larger than the first predetermined CNR1 is newly connected to the mobile station, and the mobile station enters the simultaneous communication mode (step 250).
【００５９】基地局は同時通信中のセルの受信レベルの
ＣＮＲ”を移動局に測定させ、その測定結果を移動局に
送信させて、基地局で受信する（ステップ２６０）。基
地局は受信したＣＮＲ”が前記第２の所定のＣＮＲ２よ
りも小さいか否かを判定する（ステップ２７０）。この
結果、該ＣＮＲ”が第２の所定のＣＮＲ２よりも小さい
場合には、このＣＮＲ”を有するセルに対する通信回線
を切断する（ステップ３００）。The base station causes the mobile station to measure the reception level CNR "of the cell in simultaneous communication, causes the mobile station to transmit the measurement result, and receives the measurement result at the base station (step 260). It is determined whether CNR "is smaller than the second predetermined CNR2 (step 270). As a result, if the CNR "is smaller than the second predetermined CNR2, the communication line for the cell having the CNR" is disconnected (step 300).
【００６０】また、ステップ２７０の判定において、Ｃ
ＮＲ”が第２の所定のＣＮＲ２よりも小さくない場合
に、ステップ２８０に進み、同時通信中のセルの受信レ
ベルＲを移動局に測定させ、該受信レベルＲが前記第１
の所定の受信レベルＲ１よりも小さい第２の所定の受信
レベルＲ２よりも小さいか否かを判定する（ステップ２
９０）。そして、該受信レベルＲが第２の所定の受信レ
ベルＲ２よりも小さくない場合には、ステップ２６０に
戻り、同様の処理を繰り返すが、小さい場合には、該セ
ルに対する回線を切断する（ステップ３００）。In the determination at step 270, C
If NR "is not smaller than the second predetermined CNR2, the process proceeds to step 280, where the mobile station measures the reception level R of the cell performing simultaneous communication, and the reception level R is set to the first level.
Is determined to be lower than a second predetermined reception level R2 which is lower than the predetermined reception level R1 (step 2).
90). If the reception level R is not lower than the second predetermined reception level R2, the process returns to step 260, and the same processing is repeated. If the reception level R is lower, the line for the cell is disconnected (step 300). ).
【００６１】[0061]
【発明の効果】以上説明したように、本発明によれば、
通信中の周辺セルの止まり木チャネルの受信レベルが第
１の所定の受信レベルを越える受信レベルにおけるキャ
リア対雑音比を測定し、該キャリア対雑音比が第１の所
定のキャリア対雑音比より大きいセルを新たに移動局に
接続して同時通信モードに入り、同時通信中の複数のセ
ルの受信レベルのキャリア対雑音比が前記第１の所定の
キャリア対雑音比より小さい第２の所定のキャリア対雑
音比より小さくなったセルを検出し、当該セルに対する
回線を切断するので、干渉レベルが大きくて受信レベル
が大きく見えるにも関わらず通信品質の悪いセルを選択
することがなく、通信品質の良好なセルをハンドオーバ
時に選択することができるとともに、また第１および第
２の所定のキャリア対雑音比に差を設けているため、ハ
ンドオーバのばたつきを抑えることができる。As described above, according to the present invention,
A carrier-to-noise ratio is measured at a reception level of a perch channel of a neighboring cell in communication that exceeds a first predetermined reception level, and the carrier-to-noise ratio is larger than the first predetermined carrier-to-noise ratio. A cell is newly connected to the mobile station to enter the simultaneous communication mode, and the second predetermined carrier in which the carrier-to-noise ratio of the reception level of the plurality of cells during simultaneous communication is smaller than the first predetermined carrier-to-noise ratio Since a cell that has become smaller than the noise-to-noise ratio is detected and the line for that cell is disconnected, the cell with poor communication quality is not selected despite the fact that the interference level is large and the reception level looks large. A good cell can be selected at the time of handover, and a difference is provided between the first and second predetermined carrier-to-noise ratios. It can can be suppressed.
【００６２】また、本発明によれば、基地局の制御のも
とに移動局に周辺セルの止まり木チャネルの受信レベル
を測定させ、第１の所定の受信レベルを越える受信レベ
ルについてキャリア対雑音比を移動局に測定させ、この
キャリア対雑音比が第１の所定のキャリア対雑音比より
大きいセルを移動局に接続し、同時通信中の複数のセル
の受信レベルのキャリア対雑音比を移動局に測定させ、
そのキャリア対雑音比が第１の所定のキャリア対雑音比
よりも小さい第２のキャリア対雑音比より小さくなった
セルを検出し、当該セルに対する回線を切断するので、
干渉レベルが大きくて受信レベルが大きく見えるにも関
わらず通信品質の悪いセルを選択することがなく、通信
品質の良好なセルを選択することができるとともに、第
１および第２の所定のキャリア対雑音比に差を設けてい
るため、ハンドオーバのばたつきを抑えることができる
上に、更に基地局の制御によりハンドオーバを行ってい
るため、移動局における制御、判定、記憶等の処理を基
地局が共通的に行うことができ、移動局の構成および処
理を簡単化することができる。Further, according to the present invention, the mobile station measures the reception level of the perch channel of the neighboring cell under the control of the base station, and determines the carrier to noise level for the reception level exceeding the first predetermined reception level. The mobile station measures the ratio, connects a cell whose carrier-to-noise ratio is greater than a first predetermined carrier-to-noise ratio to the mobile station, and moves the carrier-to-noise ratio of the reception level of a plurality of cells during simultaneous communication. Let the station measure,
Since a cell whose carrier-to-noise ratio is smaller than a second predetermined carrier-to-noise ratio that is smaller than a first predetermined carrier-to-noise ratio is detected and a line to the cell is disconnected,
A cell with good communication quality can be selected without selecting a cell with poor communication quality despite the fact that the interference level is large and the reception level appears to be large, and the first and second predetermined carrier pairs can be selected. Since the difference is provided in the noise ratio, it is possible to suppress the handover flutter.In addition, since the handover is performed under the control of the base station, the base station performs common processing such as control, determination, and storage in the mobile station. And the configuration and processing of the mobile station can be simplified.
【図１】本発明の一実施例に係わる移動通信ハンドオー
バ方法の処理手順を示すフローチャートである。FIG. 1 is a flowchart showing a processing procedure of a mobile communication handover method according to an embodiment of the present invention.
【図２】図１の移動通信ハンドオーバ方法を実施する移
動局および基地局の構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a mobile station and a base station that implement the mobile communication handover method of FIG.
【図３】移動局がセルＡからセルＢに移動する場合のセ
ルと移動局との位置的関係、受信レベル、およびレベル
差を示す説明図である。FIG. 3 is an explanatory diagram showing a positional relationship between a cell and a mobile station, a reception level, and a level difference when the mobile station moves from a cell A to a cell B.
【図４】本発明の他の実施例に係わる移動通信ハンドオ
ーバ方法を実施する基地局の処理手順を示すフローチャ
ートである。FIG. 4 is a flowchart showing a processing procedure of a base station implementing a mobile communication handover method according to another embodiment of the present invention.
【図５】ＣＤＭＡ方式移動通信システムのサービスエリ
ア内を構成する複数のセルと該複数のセル内を移動する
移動局の関係を示す説明図である。FIG. 5 is an explanatory diagram showing a relationship between a plurality of cells constituting a service area of a CDMA mobile communication system and a mobile station moving in the plurality of cells.
【図６】受信レベルに含まれる干渉レベル等の雑音を示
す説明図である。FIG. 6 is an explanatory diagram illustrating noise such as an interference level included in a reception level.
１０ 移動局送受信部 １２ 送受切替器 １３ 送信回路部 １４ 受信回路部 １５ 制御部 ２０ 基地局 ２１ アンテナ ２６ 基地局増幅器 ２７ 変復調装置 ２８ 拡散装置 ３０ 制御バスコントロール ３１ 監視制御装置 ３２ ２Ｍ／１．５Ｍインタフェース装置 ３３ 基地局制御装置 ３４ タイミング供給装置 REFERENCE SIGNS LIST 10 mobile station transmission / reception unit 12 transmission / reception switch 13 transmission circuit unit 14 reception circuit unit 15 control unit 20 base station 21 antenna 26 base station amplifier 27 modulation / demodulation device 28 spreading device 30 control bus control 31 supervisory control device 32 2M / 1.5M interface Device 33 Base station controller 34 Timing supply device
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 7/26 - 7/26 113 H04Q 7/04 - 7/38 H04J 13/00 - 13/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H04B 7/26-7/26 113 H04Q 7/04-7/38 H04J 13/00-13/06
Claims (14)
各基地局は同一周波数で変調され、それぞれ異なって割
り当てられた独自の拡散符号で拡散され、送信電力制御
を行わない送信電力一定の止まり木チャネルを常時送信
している符号分割多元接続方式の移動通信システムにお
ける移動通信ハンドオーバ方法であって、 移動局は通信中に周辺セルの各々の止まり木チャネルの
受信レベルを測定し、 該受信レベルのうち、第１の所定の受信レベルを越える
受信レベルにおけるキャリア対雑音比を測定し、該キャ
リア対雑音比が第１の所定のキャリア対雑音比より大き
いセルを新たに移動局に接続して同時通信モードに入
り、 移動局における同時通信中の複数のセルの受信レベルの
キャリア対雑音比が前記第１の所定のキャリア対雑音比
より小さい第２の所定のキャリア対雑音比より小さくな
った場合、または通信中の受信レベルが前記第１の所定
の受信レベルよりも小さい第２の所定の受信レベルより
小さくなった場合、当該セルに対する回線を切断するこ
とを特徴とする移動通信ハンドオーバ方法。1. A base station is provided in each of a plurality of cells,
Each base station is modulated with the same frequency, spread with a unique spreading code assigned differently, and constantly transmits a perch channel with a constant transmission power without performing transmission power control. A mobile communication handover method in a communication system, wherein a mobile station measures a reception level of each perch channel of a peripheral cell during communication, and detects a reception level exceeding a first predetermined reception level among the reception levels. A carrier-to-noise ratio is measured, a cell having the carrier-to-noise ratio greater than a first predetermined carrier-to-noise ratio is newly connected to the mobile station, and a simultaneous communication mode is entered. The carrier-to-noise ratio of the reception level of the cell is smaller than a second predetermined carrier-to-noise ratio that is smaller than the first predetermined carrier-to-noise ratio. If or when the reception level in communication has become smaller than the less than the first predetermined reception level a second predetermined reception level, the mobile communication handover method, characterized in that the line is disconnected for that cell.
現在通信中の基地局から周辺セルの拡散符号を通知さ
れ、この通知された拡散符号を用いて周辺セルの各々の
止まり木チャネルの受信レベルを測定することを特徴と
する請求項１記載の移動通信ハンドオーバ方法。2. The step of measuring the reception level,
2. The mobile station according to claim 1, wherein a spreading code of a neighboring cell is notified from a base station that is currently communicating, and a reception level of each perch channel of the surrounding cell is measured using the notified spreading code. Communication handover method.
各基地局は同一周波数で変調され、それぞれ異なって割
り当てられた独自の拡散符号で拡散され、送信電力制御
を行わない送信電力一定の止まり木チャネルを常時送信
している符号分割多元接続方式の移動通信システムにお
ける移動局装置であって、 通信中に周辺セルの各々の止まり木チャネルの受信レベ
ルを測定する測定手段と、 該測定手段で測定した受信レベルのうち、第１の所定の
受信レベルを越える受信レベルにおけるキャリア対雑音
比を測定し、該キャリア対雑音比が第１の所定のキャリ
ア対雑音比よりも大きいセルを検出する第１の検出手段
と、 同時通信中の複数のセルの受信レベルのキャリア対雑音
比が前記第１の所定のキャリア対雑音比よりも小さい第
２の所定のキャリア対雑音比よりも小さくなったセル、
または同時通信中の受信レベルが前記第１の所定の受信
レベルよりも小さい第２の所定の受信レベルよりも小さ
くなったセルを検出する第２の検出手段とを有すること
を特徴とする移動局装置。3. A base station is provided in each of the plurality of cells,
Each base station is modulated with the same frequency, spread with a unique spreading code assigned differently, and constantly transmits a perch channel with a constant transmission power without performing transmission power control. A mobile station device in a communication system, comprising: measuring means for measuring a reception level of each perch channel of a peripheral cell during communication; and a first predetermined reception level among the reception levels measured by the measurement means. First detecting means for measuring a carrier-to-noise ratio at a reception level exceeding the first level and detecting a cell having the carrier-to-noise ratio larger than a first predetermined carrier-to-noise ratio; and receiving a plurality of cells during simultaneous communication. A cell having a level of carrier-to-noise ratio less than a second predetermined carrier-to-noise ratio that is less than said first predetermined carrier-to-noise ratio;
Or a second detecting means for detecting a cell whose reception level during simultaneous communication is lower than a second predetermined reception level which is lower than the first predetermined reception level. apparatus.
ら周辺セルの拡散符号を通知され、この通知された拡散
符号を用いて周辺セルの各々の止まり木チャネルの受信
レベルを測定する手段を有することを特徴とする請求項
３記載の移動局装置。4. The measuring means is notified of a spreading code of a neighboring cell from a base station currently in communication, and measures the reception level of each perch channel of the neighboring cell using the notified spreading code. The mobile station device according to claim 3, comprising:
セルを新たに接続して該セルと同時通信モードに入る同
時通信手段を更に有することを特徴とする請求項３記載
の移動局装置。5. The mobile station apparatus according to claim 3, further comprising a simultaneous communication unit for newly connecting a cell detected by said first detection unit and entering a simultaneous communication mode with the cell.
セルを基地局に通知する通知手段を更に有し、該通知を
受けた基地局は当該セルを新たに移動局に接続して該セ
ルと同時通信モードに入らしめるように制御することを
特徴とする請求項３記載の移動局装置。6. A notifying unit for notifying a cell detected by the first detecting unit to a base station, and the base station receiving the notification newly connects the cell to a mobile station, and connects the cell to the mobile station. 4. The mobile station apparatus according to claim 3, wherein the mobile station apparatus is controlled to enter a simultaneous communication mode.
対する回線を切断する切断手段を更に有することを特徴
とする請求項３記載の移動局装置。7. The mobile station apparatus according to claim 3, further comprising a disconnection unit that disconnects a line for the cell detected by said second detection unit.
基地局に通知する通知手段を更に有し、該通知を受けた
基地局は当該セルに対する回線を切断することを特徴と
する請求項３記載の移動局装置。8. The system according to claim 1, further comprising a notifying unit for notifying the cell detected by said second detecting unit to the base station, wherein the base station receiving the notification disconnects the line for the cell. Item 3. The mobile station device according to item 3.
各基地局は同一周波数で変調され、それぞれ異なって割
り当てられた独自の拡散符号で拡散され、送信電力制御
を行わない送信電力一定の止まり木チャネルを常時送信
している符号分割多元接続方式の移動通信システムにお
ける基地局装置であって、 移動局との通信中に周辺セルの各々の止まり木チャネル
の受信レベルを移動局に測定させて、その測定結果を送
信させ、この送信された測定結果を受信する第１の受信
手段と、 該第１の受信手段で受信した受信レベルのうち、第１の
所定の受信レベルを越える受信レベルについてキャリア
対雑音比を移動局に測定させ、この測定されたキャリア
対雑音比を基地局に送信させ、この送信されたキャリア
対雑音比を受信するキャリア対雑音比受信手段と、 該キャリア対雑音比受信手段で受信したキャリア対雑音
比が第１の所定のキャリア対雑音比より大きいセルを検
出する第１の検出手段と、同時通信中の複数のセルの受
信レベルのキャリア対雑音比を移動局に測定させて、そ
の測定結果を送信させ、この送信した測定結果を受信す
る第２の受信手段と、 該第２の受信手段で受信した同時通信中の複数のセルの
受信レベルのキャリア対雑音比が前記第１の所定のキャ
リア対雑音比よりも小さい第２のキャリア対雑音比より
小さくなったセル、または同時通信中の受信レベルが前
記第１の所定の受信レベルよりも小さい第２の所定の受
信レベルよりも小さくなったセルを検出する第２の検出
手段とを有することを特徴とする基地局装置。9. A base station is provided in each of the plurality of cells,
Each base station is modulated with the same frequency, spread with a unique spreading code assigned differently, and constantly transmits a perch channel with a constant transmission power without performing transmission power control. A base station device in a communication system, comprising: causing a mobile station to measure a reception level of each perch channel of a peripheral cell during communication with the mobile station; transmitting the measurement result; and transmitting the transmitted measurement result. First receiving means for receiving, and among the reception levels received by the first receiving means, the mobile station measures the carrier-to-noise ratio for a reception level exceeding a first predetermined reception level. A carrier-to-noise ratio receiving means for transmitting the carrier-to-noise ratio to the base station, and receiving the transmitted carrier-to-noise ratio; First detection means for detecting a cell having a carrier-to-noise ratio greater than a first predetermined carrier-to-noise ratio, and causing the mobile station to measure the carrier-to-noise ratio of the reception level of a plurality of cells during simultaneous communication; A second receiving means for transmitting the measurement result and receiving the transmitted measurement result; and a carrier-to-noise ratio of a reception level of a plurality of cells in simultaneous communication received by the second reception means, the first being the first. A cell smaller than a second carrier-to-noise ratio smaller than the predetermined carrier-to-noise ratio, or a cell whose reception level during simultaneous communication is lower than a second predetermined reception level smaller than the first predetermined reception level A second detecting means for detecting a cell having a smaller size.
散符号を移動局に通知し、移動局はこの通知された拡散
符号を用いて周辺セルの各々の止まり木チャネルの受信
レベルを測定する測定手段を有することを特徴とする請
求項７記載の基地局装置。10. The first receiving means notifies a spreading code of a neighboring cell to a mobile station, and the mobile station measures a reception level of each perch channel of the surrounding cell using the notified spreading code. The base station apparatus according to claim 7, further comprising a measuring unit that performs measurement.
を新たに移動局に接続して同時通信モードに入らしめる
同時通信手段を更に有することを特徴とする請求項９記
載の基地局装置。11. The base station apparatus according to claim 9, further comprising simultaneous communication means for newly connecting a cell detected by said first detection means to a mobile station to enter a simultaneous communication mode. .
を移動局に通知する通知手段を更に有し、該通知を受け
た移動局は当該セルを新たに接続して該セルと同時通信
モードに入るように制御することを特徴とする請求項９
記載の基地局装置。12. The mobile station further includes a notifying unit for notifying a mobile station of a cell detected by the first detecting unit, and the mobile station receiving the notification newly connects the cell and performs simultaneous communication with the cell. 10. A control to enter a mode.
The base station device as described in the above.
に対する回線を切断する切断手段を更に有することを特
徴とする請求項９記載の基地局装置。13. The base station apparatus according to claim 9, further comprising a disconnecting means for disconnecting a line for the cell detected by said second detecting means.
を移動局に通知する通知手段を更に有し、該通知を受け
た移動局は当該セルに対する回線を切断することを特徴
とする請求項９記載の基地局装置。14. The mobile station further comprising a notifying unit for notifying a mobile station of a cell detected by the second detecting unit, and the mobile station receiving the notification disconnects a line for the cell. Item 10. The base station device according to item 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8970094A JP2939116B2 (en) | 1994-04-27 | 1994-04-27 | Mobile communication handover method, mobile station apparatus and base station apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8970094A JP2939116B2 (en) | 1994-04-27 | 1994-04-27 | Mobile communication handover method, mobile station apparatus and base station apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07298335A JPH07298335A (en) | 1995-11-10 |
| JP2939116B2 true JP2939116B2 (en) | 1999-08-25 |
Family
ID=13978056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8970094A Expired - Lifetime JP2939116B2 (en) | 1994-04-27 | 1994-04-27 | Mobile communication handover method, mobile station apparatus and base station apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2939116B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6862449B1 (en) | 1998-05-14 | 2005-03-01 | Fujitsu Limited | Reducing interference in cellular mobile communications networks |
| GB2337414A (en) | 1998-05-14 | 1999-11-17 | Fujitsu Ltd | Soft handoff in cellular communications networks |
| GB2337415A (en) * | 1998-05-14 | 1999-11-17 | Fujitsu Ltd | Reducing interference in cellular mobile communications networks |
| US7058035B2 (en) | 2001-06-29 | 2006-06-06 | Qualcomm, Indorporated | Communication system employing multiple handoff criteria |
| JP4004877B2 (en) * | 2002-07-09 | 2007-11-07 | シャープ株式会社 | Mobile station equipment |
| JPWO2005025254A1 (en) * | 2003-08-29 | 2006-11-16 | 三菱電機株式会社 | Mobile station and communication system |
| US7899495B2 (en) * | 2006-07-14 | 2011-03-01 | Qualcomm Incorporated | Methods and apparatus for supporting multiple connections |
| JP5110175B2 (en) | 2009-01-07 | 2012-12-26 | 富士通株式会社 | Wireless communication method, wireless communication system, base station apparatus, and terminal apparatus in wireless communication system |
-
1994
- 1994-04-27 JP JP8970094A patent/JP2939116B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07298335A (en) | 1995-11-10 |
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