JPH04273622A - Radio communication system - Google Patents
Radio communication systemInfo
- Publication number
- JPH04273622A JPH04273622A JP3401291A JP3401291A JPH04273622A JP H04273622 A JPH04273622 A JP H04273622A JP 3401291 A JP3401291 A JP 3401291A JP 3401291 A JP3401291 A JP 3401291A JP H04273622 A JPH04273622 A JP H04273622A
- Authority
- JP
- Japan
- Prior art keywords
- transmission output
- interference
- base station
- wireless communication
- area
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract 1
- 238000012935 Averaging Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は無線システムのうち、特
に送信出力が可変なシステムにおいて、システム全体の
干渉の度合いを低減させたり、呼損率を低減させること
を特に全体の制御管理局を設けなくても簡単に行なうこ
とが可能なシステムを提供する。[Industrial Application Field] The present invention is intended to reduce the degree of interference in the entire system and reduce the call loss rate in wireless systems, especially in systems where the transmission output is variable, without the need for an overall control management station. To provide a system that can be easily implemented.
【０００２】0002
【従来の技術】簡便に干渉を回避するための従来技術と
して、特開昭６１−２４４１３７号公報に記載のように
、干渉のあるなしによってチャネルの使用優先度を変更
する方法がある。これはチャネル使用時には干渉が検出
されず、使用優先度の高いものから割り当てていくとい
うものである。2. Description of the Related Art As a conventional technique for easily avoiding interference, there is a method of changing the priority of use of a channel depending on the presence or absence of interference, as described in Japanese Patent Application Laid-Open No. 61-244137. This means that interference is not detected when channels are used, and channels are allocated starting from those with the highest usage priority.
【０００３】0003
【発明が解決しようとする課題】上記従来技術は、周波
数軸方向または時間軸方向にしかチャネルの割り振りが
行なわれておらず、地理的な割り振りが行なわれていな
かった。従って、干渉の低減は可能でも、一時的に多数
の移動局が一つのエリア内に集まった場合、既定値以下
の呼損率を保つことは困難であった。SUMMARY OF THE INVENTION In the prior art described above, channels are allocated only in the frequency axis direction or the time axis direction, and no geographical allocation is performed. Therefore, although it is possible to reduce interference, it is difficult to maintain a call loss rate below a predetermined value when a large number of mobile stations temporarily gather in one area.
【０００４】0004
【課題を解決するための手段】上記目的を達成するため
に、本発明においては、周波数軸方向だけでなく、地理
的な方向についても考慮し、干渉の度合いによって送信
出力を変化し、システム全体の干渉の度合いを低減させ
、また、各エリアに位置登録されている移動局等の台数
に応じて送信出力を可変することによって一定の呼損率
を保つといったことが達成される。[Means for Solving the Problems] In order to achieve the above object, the present invention considers not only the frequency axis direction but also the geographical direction, changes the transmission output depending on the degree of interference, and makes the entire system It is possible to maintain a constant call loss rate by reducing the degree of interference and by varying the transmission output according to the number of mobile stations etc. whose locations are registered in each area.
【０００５】[0005]
【作用】送信出力を増減することにより、各エリアの影
響範囲を変化させることによって、干渉を低減する。ま
た各エリア内に登録されている移動局または基地局の数
に対応して、送信出力を変化させることによって呼損の
割合を一定値以下に留めることができる。[Operation] Interference is reduced by changing the influence range of each area by increasing or decreasing the transmission output. Furthermore, by changing the transmission output in accordance with the number of mobile stations or base stations registered in each area, it is possible to keep the call loss rate below a certain value.
【０００６】[0006]
【実施例】図１に本発明の干渉低減方法の一実施例を示
す。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the interference reduction method of the present invention.
【０００７】初期状態として、各基地局の使用周波数は
同一またはランダムに設定する。また、各基地局および
各移動局の送信周波数も同一またはランダムに設定する
。[0007] In the initial state, the frequencies used by each base station are set to be the same or randomly set. Furthermore, the transmission frequencies of each base station and each mobile station are also set to be the same or randomly.
【０００８】各移動局は待機時または通話要求時もしく
は通話中に、干渉状況を検出し、登録基地局に通知する
。[0008] Each mobile station detects an interference situation when it is on standby, when requesting a call, or during a call, and notifies the registered base station.
【０００９】各基地局は、移動局より干渉ありまたはチ
ャネルが空いていないとの通知を受けた場合、その干渉
状況（例えば受信電界強度の強さ）または干渉ありとの
報告の回数または単位時間当たりの干渉ありとの報告の
回数のいずれかまたはそれらの複数条件の組合せによっ
て送信出力を低くする。[0009] When each base station receives a notification from a mobile station that there is interference or that the channel is not available, it determines the interference status (for example, the strength of the received electric field) or the number of times or unit time of reporting that there is interference. The transmission output is lowered depending on the number of times interference is reported or a combination of these conditions.
【００１０】この際に、位置登録エリアが変更になる移
動局がでる可能性がある。[0010] At this time, there is a possibility that some mobile stations will have their location registration areas changed.
【００１１】もし、急激に基地局の送信出力を下げると
、多数の移動局が位置登録をやりなおすことになる。
従って、基地局は送信出力を下げる際には、一度に下げ
ずに少しずつ下げた方る。そうすることにより、再位置
登録をするタイミングが分散されるため、コンテンショ
ンの可能性を減らすことができる。[0011] If the transmission power of the base station is suddenly lowered, many mobile stations will have to redo location registration. Therefore, when lowering the transmission power, the base station should lower it little by little rather than all at once. By doing so, the timing of location re-registration is distributed, so the possibility of contention can be reduced.
【００１２】ところで、位置的に送信出力を下げて、エ
リアを小さくしても干渉が避けられない基地局が存在す
る可能性がある。[0012] By the way, there is a possibility that there are base stations where interference cannot be avoided even if the area is made smaller by lowering the transmission output depending on the location.
【００１３】この場合には、送信出力が予め定められた
値以下になった場合には、送信周波数を変える。[0013] In this case, when the transmission output becomes less than a predetermined value, the transmission frequency is changed.
【００１４】あまりに送信出力が小さくなった基地局は
、そのエリアも極めて小さくなっており、存在価値が小
さくなってしまうばかりでなく、傘下の移動局がすこし
移動しただけでハンドオ−バ−をしてしまうため、有線
回線のトラフィク量が大きくなる可能性が高い。従って
、この場合には送信周波数を変更し、送信出力を大きく
することによって、そのエリアを大きくする。その際に
は、干渉の最も小さい周波数を選択する。[0014] A base station whose transmission output has become too low has an extremely small area, and not only is its value diminished, but also the mobile station under its control is susceptible to handover even if it moves a little. Therefore, there is a high possibility that the amount of traffic on wired lines will increase. Therefore, in this case, the area is enlarged by changing the transmission frequency and increasing the transmission output. At that time, select the frequency that causes the least interference.
【００１５】また、移動局の待機時または通話時に、一
定時間の間、他のエリアの干渉がない場合には、送信出
力を上げてエリアを拡大することも考えられる。[0015] Furthermore, if there is no interference from other areas for a certain period of time when the mobile station is on standby or on a call, it may be possible to increase the transmission output and expand the area.
【００１６】以上干渉回避の一実施例について述べた。An embodiment of interference avoidance has been described above.
【００１７】ところで、この送信出力を増減させる別な
パラメ−タとして、位置登録された移動局の台数が考え
られる。この一実施例を図２に示す。ちなみに、図２の
２０１〜２０６の中の立方体の高さは各エリアに位置登
録された移動局または固定局の台数を示している。これ
は例えば特定の基地局に多数の移動局が接続要求を出し
た場合、呼損率が一気に上昇する。これを防ぐために、
一定数以上の移動局が位置登録した場合には、基地局の
送信出力を下げて、傘下の移動局の台数を規定の呼損率
を満たすまで減らすことができる。また、これとは反対
に傘下の移動局の台数が一定数以下になった場合には、
送信出力を上げて規定の呼損率を満たす程度まで、エリ
アを拡大することもできる。By the way, the number of mobile stations whose locations have been registered can be considered as another parameter for increasing or decreasing the transmission output. An example of this is shown in FIG. Incidentally, the height of the cubes 201 to 206 in FIG. 2 indicates the number of mobile stations or fixed stations whose locations are registered in each area. For example, if a large number of mobile stations issue connection requests to a specific base station, the call loss rate will suddenly increase. To prevent this,
When more than a certain number of mobile stations have registered their locations, the base station's transmission output can be lowered to reduce the number of mobile stations under its control until a specified call loss rate is met. Conversely, if the number of mobile stations under the umbrella falls below a certain number,
It is also possible to expand the area by increasing the transmission power to the extent that it satisfies a specified call loss rate.
【００１８】この送信出力の増減は位置登録した移動局
の台数を固定せずに、台数に応じて段階的にまたは連続
的に変化させることも可能である。[0018] The increase/decrease in the transmission output can be changed stepwise or continuously according to the number of mobile stations whose locations have been registered, without fixing the number.
【００１９】以上、本発明の実施例について述べた。The embodiments of the present invention have been described above.
【００２０】[0020]
【発明の効果】本発明によれば送信出力を増減すること
により、各エリアの影響範囲を変化させることによって
、干渉を低減する。また各エリア内に登録されている移
動局または基地局の数に対応して、送信出力を変化させ
ることによって呼損の割合を一定値以下に留めることが
できる。According to the present invention, interference is reduced by changing the influence range of each area by increasing or decreasing the transmission output. Furthermore, by changing the transmission output in accordance with the number of mobile stations or base stations registered in each area, it is possible to keep the call loss rate below a certain value.
【図１】本発明の出力可変による干渉低減の一実施例で
ある。FIG. 1 is an example of interference reduction by variable output according to the present invention.
【図２】本発明の出力可変による各エリア毎の呼量の平
均化の一実施例である。FIG. 2 is an example of averaging the traffic volume for each area by varying the output of the present invention.
１０１…各基地局の配置、１０２、１０３、１０４…基
地局、１０５、１０６…送信周波数、１０７、１０８、
１０９…各基地局の影響範囲101...Arrangement of each base station, 102, 103, 104...Base station, 105, 106...Transmission frequency, 107, 108,
109...Influence range of each base station
Claims (6)
たは固定局とからなり、複数の無線チャネルの内、一つ
または複数の任意の無線チャネルを使用することができ
、かつ、使用しようとするチャネルが空チャネルである
ことを確認してから通信を開始する機能を有する無線通
信システムにおいて、チャネル使用時に干渉を受けたり
、または使用しようとしたチャネルが空きチャネルでな
かった場合に、基地局と、移動局または固定局の内の一
つまたは複数の送信出力を低くすることによってシステ
ム全体の干渉を低減することを特徴とする無線通信方式
。Claim 1: Consisting of a base station and a mobile station or fixed station that communicates with the base station, the base station is capable of using one or more arbitrary radio channels among a plurality of radio channels, and is capable of using one or more arbitrary radio channels. In a wireless communication system that has a function to start communication after confirming that the channel to be used is an empty channel, if there is interference when using the channel, or if the channel you are trying to use is not an empty channel, the base station and a wireless communication system characterized in that interference of the entire system is reduced by lowering the transmission power of one or more of the mobile stations or the fixed stations.
は、使用しようとしたチャネルが空きチャネルでないと
いったことが、一定回数または単位時間当たり一定回数
以上あった場合に、送信出力を低くすることを特徴とす
る請求項１の無線通信方式。[Claim 2] If interference is detected when using a channel, or if the channel to be used is not an empty channel, the transmission output is lowered if a certain number of times or a certain number of times per unit time or more occur. The wireless communication system according to claim 1, characterized in that:
たは固定局とからなり、複数の無線チャネルの内、一つ
または複数の任意の無線チャネルを使用することができ
る無線通信システムにおいて、位置登録された移動局の
台数の増減に応じて、基地局と、移動局または固定局の
内の一つまたは複数の送信出力を下げたり上げたりする
ことによってシステム全体の呼損率を低減または一定値
以下に保つことを特徴とする無線通信方式。3. A wireless communication system comprising a base station and a mobile station or fixed station that communicates with the base station, and capable of using one or more arbitrary wireless channels among a plurality of wireless channels. Depending on the increase or decrease in the number of registered mobile stations, the call loss rate of the entire system is reduced or below a certain value by lowering or increasing the transmission output of the base station and one or more of the mobile stations or fixed stations. A wireless communication method that is characterized by maintaining
周波数を変更することを特徴とする請求項１または請求
項２または請求項３の無線通信方式。4. The wireless communication system according to claim 1, wherein the communication frequency is changed when the transmission output becomes less than a predetermined value.
予め定められた値とすることを特徴とする請求項２また
は請求項３または請求項４の無線通信方式。5. The wireless communication system according to claim 2, wherein the transmission output is set to a maximum or a predetermined value when changing the communication frequency.
た場合に、送信出力を増やしてエリアを拡大することを
特徴とする請求項１または請求項２または請求項４また
は請求項５の無線通信方式。6. The area according to claim 1 or 2 or 4 or 5 is characterized in that if there is no interference for a certain period of time during a call or on standby, the transmission output is increased to expand the area. Wireless communication method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3401291A JP3014149B2 (en) | 1991-02-28 | 1991-02-28 | Interference reduction method in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3401291A JP3014149B2 (en) | 1991-02-28 | 1991-02-28 | Interference reduction method in mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04273622A true JPH04273622A (en) | 1992-09-29 |
| JP3014149B2 JP3014149B2 (en) | 2000-02-28 |
Family
ID=12402510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3401291A Expired - Fee Related JP3014149B2 (en) | 1991-02-28 | 1991-02-28 | Interference reduction method in mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3014149B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072988A (en) * | 1997-01-22 | 2000-06-06 | Nec Corporation | Mobile communication system capable of promptly allocating optimum traffic channels |
| JP2009506652A (en) * | 2005-08-22 | 2009-02-12 | テルコーディア テクノロジーズ、 インコーポレイテッド | Access point interference control and selection method |
| JP2009171568A (en) * | 2007-12-21 | 2009-07-30 | Fujitsu Ltd | Communication system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101641737B1 (en) | 2009-12-31 | 2016-07-21 | 에릭슨 엘지 주식회사 | Method for changing assignment of carrier frequence band or segment and for managing tx power of the femto ap |
| KR101667870B1 (en) * | 2015-01-28 | 2016-10-19 | 김재남 | Manual blender |
-
1991
- 1991-02-28 JP JP3401291A patent/JP3014149B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072988A (en) * | 1997-01-22 | 2000-06-06 | Nec Corporation | Mobile communication system capable of promptly allocating optimum traffic channels |
| JP2009506652A (en) * | 2005-08-22 | 2009-02-12 | テルコーディア テクノロジーズ、 インコーポレイテッド | Access point interference control and selection method |
| JP2009171568A (en) * | 2007-12-21 | 2009-07-30 | Fujitsu Ltd | Communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3014149B2 (en) | 2000-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |