JP3117063B2 - Mobile communication method - Google Patents
Mobile communication methodInfo
- Publication number
- JP3117063B2 JP3117063B2 JP07024271A JP2427195A JP3117063B2 JP 3117063 B2 JP3117063 B2 JP 3117063B2 JP 07024271 A JP07024271 A JP 07024271A JP 2427195 A JP2427195 A JP 2427195A JP 3117063 B2 JP3117063 B2 JP 3117063B2
- Authority
- JP
- Japan
- Prior art keywords
- control signal
- base station
- communication method
- mobile communication
- mobile
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複数の基地局が同じ周
波数を共用し、時分割で制御信号を送信するシステムに
おいて、移動局が最大の受信レベルの制御信号に対応す
る基地局を選択し、その基地局との間に通話チャネルを
設定する移動通信方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a plurality of base stations share the same frequency and transmit control signals in a time-division manner, wherein a mobile station selects a base station corresponding to a control signal having a maximum reception level. And a mobile communication method for setting a communication channel with the base station.
【０００２】[0002]
【従来の技術】図５は、移動通信システムの基本構成を
示す。図において、複数の基地局１１はそれぞれ所定の
通信品質が得られる無線ゾーン１２を形成する。隣接す
る基地局１１の無線ゾーン１２はオーバラップしてお
り、例えばエリアＢに位置する移動局は基地局１１−１
または基地局１１−２と通信可能になっている。ただ
し、移動局は電源スイッチを入れたとき、あるいは今ま
で選択していた基地局が送信する制御信号の受信レベル
が低くなったときに、最も高いレベルの制御信号が受信
される基地局を選択して通話チャネルを設定する。2. Description of the Related Art FIG. 5 shows a basic configuration of a mobile communication system. In the figure, a plurality of base stations 11 form a wireless zone 12 in which a predetermined communication quality can be obtained. The wireless zones 12 of the adjacent base stations 11 overlap, for example, the mobile station located in the area B is the base station 11-1.
Alternatively, communication with the base station 11-2 is enabled. However, the mobile station selects the base station that receives the highest level control signal when the power switch is turned on or when the reception level of the control signal transmitted by the base station selected so far becomes low. To set the call channel.
【０００３】[0003]
【発明が解決しようとする課題】従来の方法では、移動
局に最も近い基地局が選択される。すなわち、図６に示
す例では、移動局１３は最も近い基地局１１−２を選択
する。このとき基地局のトラヒックはまったく考慮され
ず、隣接する基地局１１−１に十分な空きチャネルがあ
り、基地局１１−２のトラヒックが著しく多い場合でも
基地局１１−２が選択されていた。しかし、このような
状況では基地局１１−２の通話チャネル不足から通話が
できず、呼損となってしまうことがあった。In the conventional method, the base station closest to the mobile station is selected. That is, in the example shown in FIG. 6, the mobile station 13 selects the closest base station 11-2. At this time, the traffic of the base station was not considered at all, and the base station 11-2 was selected even when there was a sufficient free channel in the adjacent base station 11-1 and the traffic of the base station 11-2 was extremely large. However, in such a situation, a call could not be made due to a shortage of a communication channel of the base station 11-2, resulting in a call loss.
【０００４】本発明は、一部の地域のトラヒックの上昇
を抑え、呼損率を小さくすることができる移動通信方法
を提供することを目的とする。[0004] It is an object of the present invention to provide a mobile communication method capable of suppressing an increase in traffic in a part of the area and reducing a call blocking rate.
【０００５】[0005]
【課題を解決するための手段】基地局における使用チャ
ネル数が規定値より多くなったときに、制御信号の送信
を使用チャネル数に応じた時間だけ停止する（請求項
１）。基地局における使用チャネル数が規定値より多く
なったときに、制御信号の送信電力を使用チャネル数に
応じた時間だけ低減する（請求項２）。When the number of channels used in the base station exceeds a specified value, transmission of control signals is stopped for a time corresponding to the number of channels used. When the number of used channels in the base station becomes larger than a specified value, the transmission power of the control signal is reduced by a time corresponding to the number of used channels.
【０００６】基地局における使用チャネル数が規定値よ
り少なくなったときに、制御信号の送信電力を使用チャ
ネル数に応じた時間だけ増加する（請求項３）。また、
送信電力の低減量または増加量が使用チャネル数に応じ
て設定する（請求項４）。When the number of used channels in the base station becomes smaller than a prescribed value, the transmission power of the control signal is increased by a time corresponding to the number of used channels. Also,
The amount of reduction or increase in transmission power is set according to the number of channels used (claim 4).
【０００７】[0007]
【作用】本発明の移動通信方法では、使用チャネル数の
状況に応じて制御信号の送信を停止したり、送信電力を
増減して制御信号が届くエリアを変化させることによ
り、新規に基地局を使用する可能性のある移動局がその
基地局を選択する確率を変化させることができる。According to the mobile communication method of the present invention, the transmission of a control signal is stopped according to the number of channels used, or the transmission power is increased or decreased to change the area where the control signal reaches, thereby newly establishing a base station. It is possible to change the probability that a mobile station that is likely to use will select that base station.
【０００８】すなわち、使用チャネル数が多い場合（請
求項１，２）には、制御信号を停止するか、送信電力を
低減して制御信号が届くエリアを小さくすることによ
り、移動局に選択される確率を低減することができる。
また、使用チャネル数が少ない場合（請求項３）には、
制御信号の送信電力を増加して制御信号が届くエリアを
大きくすることにより、移動局に選択される確率を増加
することができる。That is, when the number of used channels is large (claims 1 and 2), the control signal is stopped or the transmission power is reduced to reduce the area where the control signal can reach, thereby selecting the mobile station. Probability can be reduced.
If the number of channels used is small (claim 3),
Increasing the transmission area of the control signal by increasing the transmission power of the control signal can increase the probability of being selected by the mobile station.
【０００９】なお、制御信号の停止時間（請求項１）、
送信電力の低減時間（請求項２）、送信電力の増加時間
（請求項３）、送信電力の低減量または増加量を使用チ
ャネル数に応じて設定することにより、トラヒック調整
を効率よく行うことができる。The stop time of the control signal (claim 1),
By setting the transmission power reduction time (Claim 2), the transmission power increase time (Claim 3), and the reduction or increase of the transmission power according to the number of channels used, traffic adjustment can be performed efficiently. it can.
【００１０】[0010]
【実施例】図１は、本発明の移動通信方法の基本原理を
示す。図において、基地局１１−１，１１−２は、それ
ぞれ無線ゾーン１２−１，１２−２を形成する。本発明
の特徴は、トラヒックに応じて基地局が制御信号の送信
停止または送信電力を変化させるところにある。図１に
示す例では、基地局１１−２のトラヒックが多いために
制御信号の送信電力を低減し、制御信号が届くエリア１
４−２を無線ゾーン１２−２に比べて狭くする。一方、
基地局１１−１の制御信号が届くエリアは無線ゾーン１
２−１とほぼ一致しているので、移動局１３は基地局１
１−１との通話チャネルが形成される。これにより、ト
ラヒックの多い基地局が選択される確率が低減され、特
定の基地局に多くのトラヒックが集中して呼損率が上昇
することを回避することができる。FIG. 1 shows the basic principle of a mobile communication method according to the present invention. In the figure, base stations 11-1 and 11-2 form wireless zones 12-1 and 12-2, respectively. A feature of the present invention resides in that the base station stops transmission of control signals or changes transmission power according to traffic. In the example shown in FIG. 1, since the traffic of the base station 11-2 is large, the transmission power of the control signal is reduced, and the area 1 in which the control signal reaches
4-2 is made narrower than the wireless zone 12-2. on the other hand,
The area where the control signal of the base station 11-1 reaches is the wireless zone 1.
2-1 almost coincides with the base station 1
A communication channel with 1-1 is formed. As a result, the probability that a base station having a large amount of traffic is selected can be reduced, and it is possible to avoid a situation in which a large amount of traffic is concentrated on a specific base station and a call blocking rate increases.
【００１１】図２は、本発明の移動通信方法の第１実施
例を示す。(1) は基地局の制御フローチャートであり、
(2) は移動局の制御フローチャートである。図におい
て、基地局は使用チャネル数を判定し（Ｓ１）、使用チ
ャネル数がＭより多くなると制御信号の送信をＸ秒間停
止する（Ｓ２）。そして、Ｙ秒間待機した後（Ｓ３）、
再び使用チャネル数の判定に戻る。なお、Ｘの値は使用
チャネル数に応じて設定してもよい。FIG. 2 shows a first embodiment of the mobile communication method according to the present invention. (1) is a control flowchart of the base station,
(2) is a control flowchart of the mobile station. In the figure, the base station determines the number of used channels (S1), and stops transmitting the control signal for X seconds when the number of used channels exceeds M (S2). After waiting for Y seconds (S3),
The process returns to the determination of the number of used channels. The value of X may be set according to the number of channels used.
【００１２】一方、移動局は定常的に基地局が送信する
制御信号を受信している（Ｓ４）。ここで、基地局が制
御信号の送信を停止し、今まで受信していた制御信号が
途切れると、他の基地局からの制御信号を検索する（Ｓ
５）。規定レベル以上の制御信号が受信されれば（Ｓ
６）、その制御信号を受信し（Ｓ７）、必要に応じて移
動局の位置を登録しなおす（Ｓ８，Ｓ９）。なお、一時
的に送信を停止した基地局の近くにいて他の基地局の制
御信号が受信できない移動局は、それまで受信していた
基地局が送信を再開したときにその制御信号を再び受信
する。On the other hand, the mobile station constantly receives a control signal transmitted from the base station (S4). Here, when the base station stops transmitting the control signal and the control signal received so far is interrupted, a search for a control signal from another base station is performed (S
5). If a control signal of a prescribed level or higher is received (S
6), the control signal is received (S7), and the position of the mobile station is registered again if necessary (S8, S9). A mobile station that is near the base station that has temporarily stopped transmitting and cannot receive the control signal of another base station receives the control signal again when the base station that has been receiving has resumed transmitting. I do.
【００１３】図３は、本発明の移動通信方法の第２実施
例を示す。(1) は基地局の制御フローチャートであり、
(2) は移動局の制御フローチャートである。図におい
て、基地局は使用チャネル数を判定し（Ｓ１）、使用チ
ャネル数がＭ以下のときは制御信号を通常の送信電力で
送信し（Ｓ１０）、Ｍより多いときは制御信号の送信電
力をＸ秒間低減する（Ｓ１１）。そして、Ｙ秒間待機し
た後（Ｓ３）、再び使用チャネル数の判定に戻る。な
お、Ｘの値は、図３(3) に示すように使用チャネル数に
応じて単調増加する関数で設定してもよい。また、送信
電力の低減量も使用チャネル数に応じて設定してもよ
い。FIG. 3 shows a second embodiment of the mobile communication method according to the present invention. (1) is a control flowchart of the base station,
(2) is a control flowchart of the mobile station. In the figure, the base station determines the number of used channels (S1). If the number of used channels is M or less, the base station transmits a control signal at normal transmission power (S10). It is reduced for X seconds (S11). After waiting for Y seconds (S3), the process returns to the determination of the number of used channels. Note that the value of X may be set by a function that monotonically increases according to the number of channels used, as shown in FIG. Also, the amount of reduction in transmission power may be set according to the number of channels used.
【００１４】一方、移動局は制御信号の受信レベルを判
定している（Ｓ１２）。ここで、基地局が制御信号の送
信電力を低減し、今まで受信していた制御信号の受信レ
ベルが規定値Ｒを下回ると、他の基地局からの制御信号
を検索する（Ｓ５）。規定レベル以上の制御信号が受信
されれば（Ｓ６）、その制御信号を受信し（Ｓ７）、必
要に応じて移動局の位置を登録しなおす（Ｓ８，Ｓ
９）。なお、一時的に制御信号の送信電力を低減した基
地局の近くにいて他の基地局の制御信号が受信できない
移動局は、それまで受信していた基地局が通常の送信電
力で送信を再開したときにその制御信号を再び受信す
る。On the other hand, the mobile station determines the reception level of the control signal (S12). Here, the base station reduces the transmission power of the control signal, and when the reception level of the control signal received so far falls below the specified value R, searches for a control signal from another base station (S5). When a control signal of a prescribed level or more is received (S6), the control signal is received (S7), and the position of the mobile station is registered again as necessary (S8, S8).
9). In the case of a mobile station that is near the base station where the transmission power of the control signal is temporarily reduced and cannot receive the control signal of another base station, the base station that has received the signal restarts transmission at the normal transmission power. Then, the control signal is received again.
【００１５】図４は、本発明の移動通信方法の第３実施
例を示す。(1) は基地局の制御フローチャートであり、
(2) は移動局の制御フローチャートである。図におい
て、基地局は使用チャネル数を判定し（Ｓ１，Ｓ１
３）、使用チャネル数がＬ未満のときは制御信号の送信
電力をＺ秒間増加し（Ｓ１４）、Ｍより多いのときは制
御信号の送信電力をＸ秒間低減する（Ｓ１１）。そし
て、Ｙ秒間待機した後（Ｓ３）、再び使用チャネル数の
判定に戻る。なお、Ｘの値は図４(3)に示すように使用
チャネル数に応じて単調増加する関数で設定し、Ｚの値
は図４(3) に示すように使用チャネル数に応じて単調減
少する関数で設定してもよい。また、送信電力の増加
量、低減量も使用チャネル数に応じて設定してもよい。
ただし、送信電力の上限は周辺の無線ゾーンへの干渉等
を考慮して定める必要がある。移動局における制御は第
２実施例と同様である。FIG. 4 shows a third embodiment of the mobile communication method according to the present invention. (1) is a control flowchart of the base station,
(2) is a control flowchart of the mobile station. In the figure, the base station determines the number of channels used (S1, S1
3) When the number of used channels is less than L, the transmission power of the control signal is increased for Z seconds (S14), and when it is more than M, the transmission power of the control signal is reduced for X seconds (S11). After waiting for Y seconds (S3), the process returns to the determination of the number of used channels. Note that the value of X is set by a function that monotonically increases according to the number of channels used, as shown in FIG. 4 (3), and the value of Z decreases monotonically according to the number of channels used, as shown in FIG. 4 (3). May be set by a function that performs In addition, the amount of increase or decrease in transmission power may be set according to the number of channels used.
However, the upper limit of the transmission power needs to be determined in consideration of interference with the surrounding wireless zone. The control in the mobile station is the same as in the second embodiment.
【００１６】[0016]
【発明の効果】以上説明したように、本発明の移動通信
方法は、特定の基地局のトラヒックが高い場合に、基地
局がトラヒックに応じて制御信号の送信停止あるいは送
信電力を調整することにより、そのトラヒックの一部を
隣接する基地局に振り分けることができる。これによ
り、一部の基地局のトラヒックの上昇を抑え、呼損率を
小さくすることができる。As described above, according to the mobile communication method of the present invention, when the traffic of a specific base station is high, the base station stops transmission of the control signal or adjusts the transmission power in accordance with the traffic. , Part of the traffic can be distributed to adjacent base stations. As a result, it is possible to suppress an increase in traffic of some base stations and reduce the call blocking rate.
【図１】本発明の移動通信方法の基本原理を説明する
図。FIG. 1 is a diagram illustrating the basic principle of a mobile communication method according to the present invention.
【図２】本発明の移動通信方法の第１実施例を示す図。FIG. 2 is a diagram showing a first embodiment of the mobile communication method of the present invention.
【図３】本発明の移動通信方法の第２実施例を示す図。FIG. 3 is a diagram showing a second embodiment of the mobile communication method of the present invention.
【図４】本発明の移動通信方法の第３実施例を示す図。FIG. 4 is a diagram showing a third embodiment of the mobile communication method according to the present invention.
【図５】移動通信システムの基本構成を示す図。FIG. 5 is a diagram showing a basic configuration of a mobile communication system.
【図６】従来の移動通信方法の基本原理を説明する図。FIG. 6 is a diagram illustrating the basic principle of a conventional mobile communication method.
１１ 基地局 １２ 無線ゾーン １３ 移動局 １４ 制御信号が届くエリア 11 base station 12 wireless zone 13 mobile station 14 area where control signals reach
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｑ 7/36 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification code FI H04Q 7/36
Claims (4)
一部が重なり、移動局と２以上の基地局との通信が可能
なシステムであり、 複数の基地局がそれぞれ所定のレベルで制御信号を送信
し、移動局が規定値以上のレベルの制御信号を受信し、
その制御信号に対応する基地局との間に通話チャネルを
設定する移動通信方法において、 前記基地局における使用チャネル数が規定値より多くな
ったときに、前記制御信号の送信を使用チャネル数に応
じた時間だけ停止することを特徴とする移動通信方法。1. A system in which a part of a wireless zone formed by adjacent base stations overlaps to enable communication between a mobile station and two or more base stations. And the mobile station receives a control signal of a level equal to or higher than a specified value,
In a mobile communication method for setting a communication channel with a base station corresponding to the control signal, when the number of used channels in the base station becomes larger than a specified value, transmission of the control signal is performed according to the number of used channels. A mobile communication method characterized by stopping for a set time.
一部が重なり、移動局と２以上の基地局との通信が可能
なシステムであり、 複数の基地局がそれぞれ所定のレベルで制御信号を送信
し、移動局が規定値以上のレベルの制御信号を受信し、
その制御信号に対応する基地局との間に通話チャネルを
設定する移動通信方法において、 前記基地局における使用チャネル数が規定値より多くな
ったときに、前記制御信号の送信電力を使用チャネル数
に応じた時間だけ低減することを特徴とする移動通信方
法。2. A system in which a part of a wireless zone formed by adjacent base stations overlaps and communication between a mobile station and two or more base stations is possible. And the mobile station receives a control signal of a level equal to or higher than a specified value,
In a mobile communication method for setting a communication channel with a base station corresponding to the control signal, when the number of used channels in the base station becomes larger than a specified value, the transmission power of the control signal is set to the number of used channels. A mobile communication method characterized in that the time is reduced by a corresponding time.
一部が重なり、移動局と２以上の基地局との通信が可能
なシステムであり、 複数の基地局がそれぞれ所定のレベルで制御信号を送信
し、移動局が規定値以上のレベルの制御信号を受信し、
その制御信号に対応する基地局との間に通話チャネルを
設定する移動通信方法において、 前記基地局における使用チャネル数が規定値より少なく
なったときに、前記制御信号の送信電力を使用チャネル
数に応じた時間だけ増加することを特徴とする移動通信
方法。3. A system in which a part of a wireless zone formed by adjacent base stations overlaps and communication between a mobile station and two or more base stations is possible. And the mobile station receives a control signal of a level equal to or higher than a specified value,
In a mobile communication method for setting a communication channel with a base station corresponding to the control signal, when the number of used channels in the base station becomes smaller than a specified value, the transmission power of the control signal is set to the number of used channels. A mobile communication method characterized by increasing by a corresponding time.
信方法において、 送信電力の低減量または増加量が使用チャネル数に応じ
て設定されることを特徴とする移動通信方法。4. The mobile communication method according to claim 2, wherein the amount of reduction or increase in transmission power is set according to the number of channels used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07024271A JP3117063B2 (en) | 1995-02-13 | 1995-02-13 | Mobile communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07024271A JP3117063B2 (en) | 1995-02-13 | 1995-02-13 | Mobile communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08223629A JPH08223629A (en) | 1996-08-30 |
| JP3117063B2 true JP3117063B2 (en) | 2000-12-11 |
Family
ID=12133556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07024271A Expired - Fee Related JP3117063B2 (en) | 1995-02-13 | 1995-02-13 | Mobile communication method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3117063B2 (en) |
Families Citing this family (3)
| 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 |
| JP4510106B2 (en) * | 2008-03-06 | 2010-07-21 | 三菱電機株式会社 | COMMUNICATION SYSTEM AND BASE STATION CONTROL DEVICE |
-
1995
- 1995-02-13 JP JP07024271A patent/JP3117063B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08223629A (en) | 1996-08-30 |
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