JP2560615B2 - Mobile communication system - Google Patents
Mobile communication systemInfo
- Publication number
- JP2560615B2 JP2560615B2 JP5190303A JP19030393A JP2560615B2 JP 2560615 B2 JP2560615 B2 JP 2560615B2 JP 5190303 A JP5190303 A JP 5190303A JP 19030393 A JP19030393 A JP 19030393A JP 2560615 B2 JP2560615 B2 JP 2560615B2
- Authority
- JP
- Japan
- Prior art keywords
- zone
- base station
- wireless zone
- channel switching
- threshold value
- 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 - Fee Related
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はセルラ方式の移動通信シ
ステムの移動局に利用する。特に、移動局のチャネル切
替方式に関すものである。BACKGROUND OF THE INVENTION The present invention is used in a mobile station of a cellular mobile communication system. In particular, it relates to the channel switching system of mobile stations.
【０００２】[0002]
【従来の技術】従来、移動通信システムは、移動局が受
信する基地局の信号の受信レベルにより通信中のチャネ
ルを切替えるか否かを判断していた。すなわち、周辺無
線ゾーンの受信レベルが自無線ゾーンの受信レベルに比
べてあらかじめ定められたしきい値以上に高くなった場
合にチャネル切替を行う。この場合に、しきい値は、チ
ャネル切替時のチャタリング防止のために定められ、従
来の通信中のチャネル切替方式では、前記しきい値が全
ての周辺無線ゾーンに対して等しい値であった。2. Description of the Related Art Conventionally, a mobile communication system determines whether or not to switch the channel in communication according to the reception level of the signal of the base station received by the mobile station. That is, the channel switching is performed when the reception level of the peripheral wireless zone becomes higher than the reception level of the own wireless zone by a predetermined threshold value or more. In this case, the threshold value is set in order to prevent chattering at the time of channel switching, and in the conventional channel switching method during communication, the threshold value is equal to all peripheral wireless zones.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このような従
来の移動通信システムでは、無線ゾーンの大きさが異な
る場合に十分な対応ができない。すなわち、基地局の送
信電力、無線ゾーンの地形的な影響、市街地域における
建物の影響などにより、各無線ゾーンの大きさは一定で
はない。上記従来システムでは、しきい値が周辺無線ゾ
ーンの全てに対して等しい値となっているので、各周辺
無線ゾーンの大きさが極端に異なる場合には、しきい値
を小さいゾーンに合わせ大きくとると、大きい無線ゾー
ンへのチャネル切替のタイミングが遅くなる欠点があっ
た。また逆にしきい値を大きい無線ゾーンに合わせ小さ
くとると、小さい無線ゾーンへのチャネル切替時のチャ
タリングが発生しやすい欠点があった。However, such a conventional mobile communication system cannot sufficiently cope with the case where the sizes of the radio zones are different. That is, the size of each wireless zone is not constant due to the transmission power of the base station, the topographical effect of the wireless zone, the effect of the building in the urban area, and the like. In the above conventional system, the threshold value is the same for all the peripheral wireless zones. Therefore, when the peripheral wireless zones are extremely different in size, the threshold value is set to a large value for a small zone. Then, there is a drawback that the timing of channel switching to a large wireless zone is delayed. On the contrary, if the threshold value is set to be small in accordance with the large wireless zone, chattering is likely to occur at the time of channel switching to the small wireless zone.
【０００４】従来、セルラ方式の移動通信システムの交
換局がシステムの負荷と各基地局の負荷とチャネルの使
用率とをチャネル切替のしきい値に反映させて無線ゾー
ンの領域を変化させ、通話チャネルを効率よく使用し、
通話品質と負荷のバランス制御を行う提案がある（特開
平３−１３５１２号公報）。また制御局が各基地局の使
用率、弱電界での通話チャネル切断率を計測し、送信電
力と通話チャネル切替用の受信電界レベルしきい値を変
化させ、通話サービス率の向上を図る提案がある（特開
昭６４−２９０３０号公報）。これらはいずれも移動局
が無線ゾーンに対応して切替のタイミングの遅れおよび
チャタリングの発生を防止すために行うものではない。Conventionally, a switching center of a cellular type mobile communication system changes the area of a wireless zone by reflecting the system load, the load of each base station, and the usage rate of a channel on a threshold value for channel switching, thereby making a call. Use channels efficiently,
There is a proposal for balance control between call quality and load (Japanese Patent Laid-Open No. 3-13512). In addition, there is a proposal that the control station measures the usage rate of each base station and the call channel disconnection rate in a weak electric field and changes the transmission power and the reception field level threshold for switching the call channel to improve the call service rate. (Japanese Patent Laid-Open No. 64-29030). None of these is performed by the mobile station in order to prevent switching timing delay and chattering from occurring corresponding to the wireless zone.
【０００５】本発明は前記の欠点を解決するもので、大
小様々の周辺無線ゾーンに対して切替のタイミングの遅
れおよびチャタリングの発生を防止できる移動通信シス
テムを提供することを目的とする。The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a mobile communication system capable of preventing delay in switching timing and occurrence of chattering in various peripheral wireless zones of different sizes.
【０００６】[0006]
【課題を解決するための手段】第一の発明は、周辺無線
ゾーンの基地局が送信するチャネルの信号受信レベルが
通信中の無線ゾーンの基地局が送信する信号の受信レベ
ルに比べてあらかじめ定められたしきい値以上に高くな
ったときその周辺無線ゾーンへのチャネル切替を行い通
信を継続するチャネル切替手段を含む移動局を備えた移
動通信システムにおいて、前記あらかじめ定められたし
きい値は基地局ごとに対応して固定的に設定され、前記
しきい値は、大きい無線ゾーンに対しては小さい無線ゾ
ーンに対するよりは小さい値に設定されたことを特徴と
する。According to a first aspect of the invention, a signal reception level of a channel transmitted by a base station in a peripheral wireless zone is predetermined in comparison with a reception level of a signal transmitted by a base station in a wireless zone in communication. In a mobile communication system equipped with a mobile station including a channel switching means for performing channel switching to the surrounding wireless zone and continuing communication when the value becomes higher than a predetermined threshold, the predetermined threshold is a base. Fixed setting corresponding to each station ,
The threshold is a small radio zone for large radio zones.
It is characterized in that it is set to a value smaller than that for
【０００７】第二の発明は、前記移動通信システムに利
用する移動局装置である。周辺無線ゾーンの基地局が送
信するチャネルの信号受信レベルが通信中の無線ゾーン
の基地局が送信する信号の受信レベルに比べてあらかじ
め定められたしきい値以上に高くなったときその周辺無
線ゾーンへのチャネル切替を行い通信を継続するチャネ
ル切替手段を備えた移動局装置において、前記チャネル
切替手段は前記しきい値を記憶する記憶エリアを備え、
この記憶エリアには、基地局に対応して個別に設定され
たしきい値が記憶され、このしきい値は、大きい無線ゾ
ーンに対しては小さい無線ゾーンに対するよりは小さい
値に設定されたことを特徴とする。この装置は前記シス
テムとは別に個別の商品として取引することができる。A second invention is a mobile station apparatus used for the mobile communication system. Mu surrounding when the base station near the radio zone is higher than a predetermined threshold as compared to the reception level of the signal which the signal reception level of the channel to be transmitted is transmitted by the base station of the radio zone in communication < In a mobile station apparatus including a channel switching unit that switches a channel to a line zone and continues communication, the channel switching unit includes a storage area for storing the threshold value,
The storage area threshold set individually corresponding to the base station is stored, this threshold is greater radio zone
Smaller for wireless zones less than for wireless zones
It is characterized by being set to a value . This device can be traded as an individual product separately from the system.
【０００８】[0008]
【作用】あらかじめ定められたしきい値は基地局対応に
個別に固定的に設定され、周辺の無線ゾーンのチャネル
の受信レベルが自無線ゾーンのチャネルの受信レベルに
比べてその無線ゾーンの基地局に対応するしきい値以上
に高くなったと判断したときその無線ゾーンへのチャネ
ル切替を行う。ここで、しきい値は、大きい無線ゾーン
に対しては小さい無線ゾーンに対するよりは小さい値に
設定される。これにより大小様々の周辺無線ゾーンに対
して切替のタイミングの遅れおよびチャタリングの発生
を防止できる。The predetermined threshold value is fixedly set individually for each base station , and the reception level of the channel of the peripheral wireless zone is higher than that of the channel of its own wireless zone. When it is determined that the value becomes higher than the threshold value corresponding to, the channel is switched to the wireless zone. Here, the threshold value is set to a smaller value for the large wireless zone than for the small wireless zone. As a result, it is possible to prevent delay in switching timing and occurrence of chattering in various large and small peripheral wireless zones.
【０００９】[0009]
【実施例】本発明の実施例について図面を参照して説明
する。Embodiments of the present invention will be described with reference to the drawings.
【００１０】図１は本発明一実施例移動通信システムの
ブロック構成図である。図１において、移動通信システ
ムは、周辺無線ゾーン６、７の基地局２、３が送信する
チャネルの信号受信レベルが通信中の無線ゾーン５の基
地局１が送信する信号の受信レベルに比べてあらかじめ
定められたしきい値以上に高くなったときその無線ゾー
ン６、７へのチャネル切替を行い通信を継続するチャネ
ル切替手段を含む移動局４を備える。FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention. In FIG. 1, in the mobile communication system, the signal reception level of the channel transmitted by the base stations 2 and 3 in the peripheral wireless zones 6 and 7 is higher than the reception level of the signal transmitted from the base station 1 in the wireless zone 5 in communication. The mobile station 4 is provided with a channel switching means for switching channels to the wireless zones 6 and 7 and continuing communication when the values become higher than a predetermined threshold value.
【００１１】ここで本発明の特徴とするところは、前記
あらかじめ定められたしきい値は基地局２、３対応に個
別に固定的に設定されたことを特徴とする。A feature of the present invention is that the predetermined threshold value is fixedly set individually for each of the base stations 2 and 3.
【００１２】また、前記しきい値は、大きい無線ゾーン
に対しては小さい無線ゾーンに対するよりは小さい値に
設定される。Further, the threshold value is set to a smaller value for a large wireless zone than for a small wireless zone.
【００１３】このような構成の移動通信システムの動作
について説明する。図２は本発明の移動通信システムの
各基地局を結ぶ直線上を移動する移動局の受信レベルを
示す図である。図１において、移動局４は無線ゾーン５
で通信中であり、図２に示すように各周辺の無線ゾーン
６、７に対して個別に異なるしきい値８、９が設定され
ている。こで、移動局４が無線ゾーン６へチャネル切替
を行う場合に、しきい値８により切替を判断する。ま
た、無線ゾーン７へチャネル切替を行う場合には、しき
い値９により切替を判断する。図１に示すように、しき
い値９に対して、しきい値８を大きくとることにより適
切なオーバラップゾーン１０が得られ、チャネル切替時
のチャタリングが避けられる。また、しきい値８に対し
て、しきい値９を小さくとることにより適正なオーバラ
ップゾーン１１が得られ、チャネル切替の遅れを防げ
る。The operation of the mobile communication system having such a configuration will be described. FIG. 2 is a diagram showing a reception level of a mobile station moving on a straight line connecting each base station of the mobile communication system of the present invention. In FIG. 1, the mobile station 4 has a wireless zone 5.
2, and different thresholds 8 and 9 are individually set for the wireless zones 6 and 7 in the surroundings as shown in FIG. Here, when the mobile station 4 switches the channel to the wireless zone 6, the switching is determined by the threshold value 8. Further, when the channel is switched to the wireless zone 7, the switching is judged by the threshold value 9. As shown in FIG. 1, by setting the threshold value 8 larger than the threshold value 9, an appropriate overlap zone 10 can be obtained, and chattering at the time of channel switching can be avoided. Further, by setting the threshold value 9 smaller than the threshold value 8, a proper overlap zone 11 can be obtained and a delay in channel switching can be prevented.
【００１４】図３は本発明他の実施例移動局装置のブロ
ック構成図である。図３において、２０は移動局装置を
示し、２１はチャネル切替手段を示し、また２２は記憶
エリアを示す。図４は本発明他の実施例移動局装置の記
憶エリアの内容を示す図である。図５は本発明他の実施
例移動局装置の動作を示すフローチャートであり、チャ
ネル切替方式の制御アルゴリズムを示す。FIG. 3 is a block diagram of a mobile station apparatus according to another embodiment of the present invention. In FIG. 3, 20 indicates a mobile station device, 21 indicates a channel switching means, and 22 indicates a storage area. FIG. 4 is a diagram showing the contents of a storage area of a mobile station apparatus according to another embodiment of the present invention. FIG. 5 is a flow chart showing the operation of the mobile station apparatus according to another embodiment of the present invention, showing a control algorithm of the channel switching system.
【００１５】図３〜図５において、ステップＳ２１で通
信開始時に記憶エリア２２に記憶された周辺無線ゾーン
６、７に対するしきい値８、９を読み出す。ステップＳ
２３では自無線ゾーン５と周辺無線ゾーン６、７の受信
レベルを検出する。ステップＳ２５、Ｓ２６で自無線ゾ
ーン５の受信レベルに無線ゾーン６に対するしきい値８
を加えた値と周辺無線ゾーン６の受信レベルとを比較
し、自無線ゾーン５の受信レベルとしきい値８との加算
値が小さければチャネル切替処理へ行き（ステップＳ２
７）、大きければ次の周辺無線ゾーン７の比較を行い
（Ｓ２４、Ｓ２５、Ｓ２６）、全ての周辺無線ゾーンの
比較が終了したらステップＳ２２へ戻り、続けて処理を
行う場合にはステップＳ２３より動作を繰り返す。この
場合に比較するしきい値と周辺無線ゾーンとは、一対一
に対応している。3 to 5, in step S21, the threshold values 8 and 9 for the peripheral wireless zones 6 and 7 stored in the storage area 22 at the start of communication are read out. Step S
At 23, the reception levels of the own wireless zone 5 and the peripheral wireless zones 6 and 7 are detected. In steps S25 and S26, the threshold level 8 for the wireless zone 6 is set to the reception level of the wireless zone 5 itself.
Is compared with the reception level of the peripheral wireless zone 6, and if the added value of the reception level of the own wireless zone 5 and the threshold value 8 is small, go to channel switching processing (step S2
7) If it is larger, the next peripheral wireless zone 7 is compared (S24, S25, S26). When the comparison of all the peripheral wireless zones is completed, the process returns to step S22, and if the subsequent processing is performed, the operation is performed from step S23. repeat. The threshold value and the peripheral wireless zone to be compared in this case have a one-to-one correspondence.
【００１６】本実施例の移動局装置は市場で個別に商品
として取引することができ、利用者は移動通信システム
に接続して使用できる。The mobile station device of this embodiment can be individually traded as a product on the market, and the user can use it by connecting to the mobile communication system.
【００１７】[0017]
【発明の効果】以上説明したように、本発明は、大小様
々の周辺無線ゾーンに対して切替のタイミングの遅れお
よびチャタリングの発生を防止できる。これにより、円
滑なチャネル切替を行うことができる。As described above, according to the present invention, it is possible to prevent the delay of switching timing and the occurrence of chattering in various peripheral wireless zones of different sizes. As a result, smooth channel switching can be performed.
【図１】本発明一実施例移動通信システムのブロック構
成図。FIG. 1 is a block configuration diagram of a mobile communication system according to an embodiment of the present invention.
【図２】本発明の移動通信システムの基地局からの受信
レベルの変化を示す図。FIG. 2 is a diagram showing changes in the reception level from the base station of the mobile communication system of the present invention.
【図３】本発明他の実施例移動局装置のブロック構成
図。FIG. 3 is a block configuration diagram of a mobile station apparatus according to another embodiment of the present invention.
【図４】本発明他の実施例移動局装置の記憶エリアの内
容を示す図。FIG. 4 is a diagram showing the contents of a storage area of a mobile station device according to another embodiment of the present invention.
【図５】本発明他の実施例移動装置の動作を示すフロー
チャート。FIG. 5 is a flowchart showing the operation of the moving apparatus according to another embodiment of the present invention.
１〜３ 基地局 ４ 移動局 ５〜７ 無線ゾーン ８、９ しきい値 １０、１１ オーバラップゾーン ２０ 移動局装置 ２１ チャネル切替手段 ２２ 記憶エリア 1 to 3 base station 4 mobile station 5 to 7 wireless zone 8 and 9 threshold value 10 and 11 overlap zone 20 mobile station device 21 channel switching means 22 storage area
Claims (2)
ネルの信号受信レベルが通信中の無線ゾーンの基地局が
送信する信号の受信レベルに比べてあらかじめ定められ
たしきい値以上に高くなったときその周辺無線ゾーンへ
のチャネル切替を行い通信を継続するチャネル切替手段
を含む移動局を備えた移動通信システムにおいて、 前記あらかじめ定められたしきい値は基地局ごとに対応
して固定的に設定され、 前記しきい値は、大きい無線ゾーンに対しては小さい無
線ゾーンに対するよりは小さい値に設定された ことを特
徴とする移動通信システム。1. A signal reception level of a channel transmitted by a base station in a peripheral wireless zone is higher than a predetermined threshold value as compared with a reception level of a signal transmitted by a base station in a wireless zone in communication. At this time, in a mobile communication system including a mobile station including a channel switching means for performing channel switching to the surrounding wireless zone and continuing communication, the predetermined threshold corresponds to each base station.
Is fixedly set in, it said threshold is smaller for large radio zone free
A mobile communication system characterized by being set to a value smaller than for the line zone .
ネルの信号受信レベルが通信中の無線ゾーンの基地局が
送信する信号の受信レベルに比べてあらかじめ定められ
たしきい値以上に高くなったときその周辺無線ゾーンへ
のチャネル切替を行い通信を継続するチャネル切替手段
を備えた移動局装置において、 前記チャネル切替手段は前記しきい値を記憶する記憶エ
リアを備え、 この記憶エリアには、基地局に対応して個別に設定され
たしきい値が記憶され、 このしきい値は、大きい無線ゾーンに対しては小さい無
線ゾーンに対するよりは小さい値に設定された ことを特
徴とする移動局装置。2. A signal reception level of a channel transmitted by a base station in a peripheral wireless zone is higher than a reception threshold level of a signal transmitted by a base station in a communicating wireless zone by a predetermined threshold value or more. At this time, in a mobile station apparatus equipped with a channel switching means for performing channel switching to the peripheral wireless zone and continuing communication, the channel switching means comprises a storage area for storing the threshold value, and this storage area includes a base station. station the stored threshold set individually in correspondence with, this threshold, relative to a large radio zone small No
A mobile station device characterized by being set to a value smaller than that for the line zone .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5190303A JP2560615B2 (en) | 1993-07-30 | 1993-07-30 | Mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5190303A JP2560615B2 (en) | 1993-07-30 | 1993-07-30 | Mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0746647A JPH0746647A (en) | 1995-02-14 |
| JP2560615B2 true JP2560615B2 (en) | 1996-12-04 |
Family
ID=16255917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5190303A Expired - Fee Related JP2560615B2 (en) | 1993-07-30 | 1993-07-30 | Mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2560615B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100523259B1 (en) * | 1998-12-31 | 2005-12-30 | 주식회사 팬택앤큐리텔 | How to block soft handoff processing in fixed terminal of WLL system |
| JP3293599B2 (en) | 1999-07-28 | 2002-06-17 | 日本電気株式会社 | CDMA mobile communication system and inter-system handoff control method |
| JP4297568B2 (en) | 1999-09-02 | 2009-07-15 | 富士通株式会社 | Radio communication control apparatus and mobile radio communication system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2826189B2 (en) * | 1990-11-19 | 1998-11-18 | 富士通株式会社 | Mobile communication system and mobile device |
| JP2940886B2 (en) * | 1991-07-08 | 1999-08-25 | 日本電信電話株式会社 | Channel switching method between multiple wireless zones |
-
1993
- 1993-07-30 JP JP5190303A patent/JP2560615B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0746647A (en) | 1995-02-14 |
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