JPH05284088A - Transmission power control system for mobile communication - Google Patents
Transmission power control system for mobile communicationInfo
- Publication number
- JPH05284088A JPH05284088A JP4135557A JP13555792A JPH05284088A JP H05284088 A JPH05284088 A JP H05284088A JP 4135557 A JP4135557 A JP 4135557A JP 13555792 A JP13555792 A JP 13555792A JP H05284088 A JPH05284088 A JP H05284088A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- transmission power
- reception level
- cell
- station
- 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.)
- Withdrawn
Links
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- Mobile Radio Communication Systems (AREA)
Abstract
(57)【要約】
【目的】 セル式移動通信方式で、外的要因の変化にか
かわらず自局のセル内を必要な受信レベルで覆うための
送信電力制御を提供することを目的とする。
【構成】 基地局（１）は送信電力判定用電波を送信
し、該基地局に隣接する隣接基地局（２ａ，２ｂ，２
ｃ，２ｄ）は該判定用電波の受信レベルを検出し、制御
基地局（３）は隣接基地局（２ａ，２ｂ，２ｃ，２ｄ）
が検出した受信レベルを基地局（１）に連絡する。基地
局（１）は連絡された受信レベルを基に自局の送信電力
を決定する。
(57) [Abstract] [Purpose] It is an object of the present invention to provide a transmission power control for covering the inside of a cell of a local station with a required reception level regardless of changes in external factors in a cell type mobile communication system. [Structure] A base station (1) transmits a radio wave for transmission power determination, and adjacent base stations (2a, 2b, 2) adjacent to the base station are transmitted.
c, 2d) detects the reception level of the judgment radio wave, and the control base station (3) determines the adjacent base stations (2a, 2b, 2c, 2d).
Notifies the base station (1) of the reception level detected by. The base station (1) determines its own transmission power based on the notified reception level.
Description
【０００１】[0001]
【産業上の利用分野】移動通信における基地局の送信電
力制御に関するものである。TECHNICAL FIELD The present invention relates to transmission power control of a base station in mobile communication.
【０００２】[0002]
【従来の技術】従来用いられている基地局の送信電力制
御は、同一周波数局への干渉を低減させる目的で行なわ
れている。予め送信電力の最大値を決めておき通常はこ
の送信電力で移動局と通信を行なうが、移動局が基地局
近傍に近づいたりして送受信間の伝搬損失が小さくなっ
た場合には送信電力を低く制御して干渉を低減させてい
る。2. Description of the Related Art Conventionally used base station transmission power control is performed for the purpose of reducing interference with the same frequency station. The maximum value of the transmission power is decided in advance, and normally this communication power is used to communicate with the mobile station.However, when the mobile station approaches the vicinity of the base station and the propagation loss between transmission and reception decreases, the transmission power is reduced. It is controlled low to reduce interference.
【０００３】従来のセルは基地局を建物屋上や鉄塔に接
地していた為、基地局周辺に見通しを遮るような高い建
物が建てられない限り一定距離の地点おける伝搬損失は
ほとんど一定であった。また、セル半径も１ｋｍ以上の
大きなセルであった為、複数の隣接基地局との間隔に多
少のばらつきがあっても、予め決めた送信電力最大値に
よってサービスエリアのほとんどを覆うことができた。
そのため、自局のセル内を必要な受信レベルで覆う目的
の為の送信電力制御は考えられなかった。In the conventional cell, since the base station is grounded on the roof of a building or a steel tower, the propagation loss at a certain distance is almost constant unless a high building is built around the base station to obstruct the line of sight. .. Also, since the cell radius is a large cell of 1 km or more, even if there is some variation in the spacing between a plurality of adjacent base stations, most of the service area can be covered by the predetermined maximum transmission power value. ..
Therefore, transmission power control for the purpose of covering the cell of the own station with a required reception level was not considered.
【０００４】しかし、いわゆるマイクロセル方式のよう
に基地局を路上等に接地する方式では、基地局の隣に大
型トラックが停車して見通しを遮ったり、昼と夜の交通
量の違い等から送受信間の伝搬損失が時々刻々変化する
ため、送信電力最大値を固定させる従来の方法では自局
のセル内を必要な受信レベルで覆うことが出来ない欠点
を生じる。また、既に基地局を設定してあるエリアに新
たに基地局を追加する場合には、また新たにそれぞれの
基地局の送信電力最大値を決めなおす必要がある。これ
らの欠点を補う為に、種々の外的変化にかかわらず自局
セル内を必要な受信レベルで覆うための送信電力制御が
必要である。However, in a system in which a base station is grounded on the road, such as a so-called microcell system, a large truck stops next to the base station to block the line of sight, and due to a difference in traffic volume between day and night, transmission / reception occurs. Since the propagation loss between them changes from moment to moment, the conventional method of fixing the maximum transmission power value has the drawback that the cell of the local station cannot be covered with the required reception level. In addition, when a new base station is added to the area where the base station has already been set, it is necessary to newly determine the maximum transmission power value of each base station. In order to compensate for these drawbacks, it is necessary to control the transmission power in order to cover the inside of the own cell with a required reception level regardless of various external changes.
【０００５】[0005]
【発明が解決しようとする課題】以上述べたように従来
の送信電力制御では、同一周波数局への干渉低減の効果
はあるが、自局セル内を必要な受信レベルで覆う効果が
なかった。本発明は、時々刻々変化する自局の伝搬損失
状況に応じて送信電力を制御し、自局セル内を必要な受
信レベルで覆うことを目的としている。As described above, the conventional transmission power control has the effect of reducing interference with the same frequency station, but does not have the effect of covering the inside of its own cell with the required reception level. An object of the present invention is to control the transmission power according to the propagation loss situation of the own station, which changes from moment to moment, and to cover the cell of the own station with a required reception level.
【０００６】[0006]
【課題を解決するための手段】この目的を達成するため
の本発明の特徴は、サービスエリアが複数のセルで構成
され、各セルに対応して基地局を配置し、移動局はこれ
ら基地局の中の１つと通信するセル式移動通信方式にお
いて、基地局は送信電力判定用電波を送信し、該基地局
に隣接する基地局は送信電力判定用電波の受信レベルを
検出し、該基地局と隣接基地局とを制御する制御基地局
においては隣接基地局で検出した受信レベルを該基地局
に連絡し、該基地局は連絡された受信レベルを基に自局
の送信電力値を決定する移動通信における送信電力制御
方式にある。A feature of the present invention for achieving this object is that a service area is composed of a plurality of cells, a base station is arranged corresponding to each cell, and a mobile station is provided with these base stations. In the cell type mobile communication system for communicating with one of the base stations, a base station transmits a transmission power determination radio wave, a base station adjacent to the base station detects a reception level of the transmission power determination radio wave, and the base station In the control base station which controls the base station and the adjacent base station, the reception level detected by the adjacent base station is notified to the base station, and the base station determines the transmission power value of the own station based on the notified reception level. It is a transmission power control method in mobile communication.
【０００７】[0007]
【作用】本発明は自局セル内の受信レベルが時々刻々変
化する場合や、サービスエリア内に新しい基地局を追加
したり、従来から接地されている基地局を削除する場合
などにおいて基地局の送信電力最大値を制御することを
主要な特徴とする。路上に基地局を設置するセル方式で
は、基地局の近くに大型トラック等の障害物が有る場合
や、夜間に対して昼間のように交通量が増加する場合に
は、伝搬損失が増加して自局セル内の受信レベルが低下
し、通信が出来ない場所が発生してくる。このような場
合に本発明の送信電力制御を用いると、自局セル内の受
信レベルを確保できる。According to the present invention, when the reception level in the own-station cell changes from moment to moment, when a new base station is added to the service area, or when a base station that is conventionally grounded is deleted, The main feature is to control the maximum transmission power value. In the cell system in which a base station is installed on the road, the propagation loss increases when there is an obstacle such as a large truck near the base station or when the traffic volume increases during the daytime compared to nighttime. The reception level in the own cell decreases, and there are places where communication is not possible. If the transmission power control of the present invention is used in such a case, the reception level in the own cell can be secured.
【０００８】また、基地局を追加したり、削除したりし
た場合には、各基地局が記憶している隣接基地局の情報
（隣接基地局の番号、隣接既知局までの距離など）を下
記変えることで、受信レベルの測定を行ない最適な送信
電力を決定することができる。路上に基地局を設置する
セルでは電波が道路に添って伝搬するため、移動局と同
程度の高さにある隣接基地局で受信されたレベルから移
動局で受信されるであろう受信レベルが推定できる。こ
の為本発明は、路上に基地局を設置するセルでは特に効
果的となる。In addition, when a base station is added or deleted, the information of the adjacent base stations stored in each base station (number of the adjacent base station, distance to the adjacent known station, etc.) is shown below. By changing it, it is possible to measure the reception level and determine the optimum transmission power. In a cell where a base station is installed on the road, radio waves propagate along the road, so the reception level that a mobile station may receive from the level received by an adjacent base station at the same height as the mobile station. Can be estimated. Therefore, the present invention is particularly effective in a cell in which a base station is installed on the road.
【０００９】[0009]
【発明の原理】図２に本発明を説明する図を示す。１は
送信電力制御を行う基地局、２ａ〜２ｄは１の隣接基地
局、３は制御基地局、４は１のセル、５ａ〜５ｄは２ａ
〜２ｄのセルである。送信電力制御を行う基地局１は、
送信電力判定用の電波を送信し、隣接基地局２ａ〜２ｄ
はその電波を受信し受信レベルを制御基地局３に報告す
る。制御基地局３は基地局１に各隣接基地局での受信レ
ベルを連絡する。基地局１では連絡された受信レベルを
基に自局の送信電力最大値を決定する。Principle of the Invention FIG. 2 shows a diagram for explaining the present invention. Reference numeral 1 is a base station that controls transmission power, 2a to 2d are 1 adjacent base stations, 3 is a control base station, 4 is a cell of 1 and 5a to 5d are 2a.
~ 2d cells. The base station 1 that performs transmission power control is
Transmits a radio wave for transmission power determination, and the adjacent base stations 2a-2d
Receives the radio wave and reports the reception level to the control base station 3. The control base station 3 informs the base station 1 of the reception level at each adjacent base station. The base station 1 determines the maximum transmission power value of its own station based on the notified reception level.
【００１０】送信電力最大値の決定は次のように行う。
隣接基地局が４局ある場合で考える。送信電力をＰ0
（ｄＢ）、送受信間距離ｄｉをパラメータとした受信レ
ベルＶｉ（ｄＢ）の推定式を次のように仮定する。 Ｖｉ＝Ｐ0 −［ａ1 ・ｌｏｇ（ｄｉ）＋ａ2i］ （１） The maximum transmission power value is determined as follows.
Consider the case where there are four adjacent base stations. Transmit power to P 0
(DB), the estimation formula of the reception level Vi (dB) with the distance di between transmission and reception as a parameter is assumed as follows. Vi = P 0 − [a 1 · log (di) + a 2i ] (1)
【００１１】ａ1 は予め決められた定数で、ａ2iはその
つど求められる値である。各隣接基地局までの距離ｄｉ
（ｉ＝１〜４）とａ1 は既知なので、送信した電力Ｐ0
と連絡された受信レベルＶｉから定数ａ2iを求める。自
局は各隣接基地局との中間までの距離を所要レベルＶｔ
ｈ（ｄＢ）で覆えばよいので、式（１）より、送信電力
Ｐｉは、 Ｐｉ＝Ｖｔｈ＋［ａ1 ・ｌｏｇ（ｄｉ／２）＋ａ2i］ （２） となる。A 1 is a predetermined constant, and a 2i is a value obtained each time. Distance di to each adjacent base station
Since (i = 1 to 4) and a 1 are known, the transmitted power P 0
The constant a 2i is obtained from the reception level Vi that is informed. The own station needs to measure the distance to the middle of each adjacent base station at the required level Vt.
Since it suffices to cover with h (dB), the transmission power Pi is expressed by the equation (1) as follows: Pi = Vth + [a 1 · log (di / 2) + a 2i ] (2)
【００１２】このようにして求められた送信電力最大値
Ｐｉ（ｉ＝１〜４）によって最終的な送信電力最大値Ｐ
を求める。求める方法は次のいづれかの方法で行う。 1)Ｐｉ（ｉ＝１〜４）の平均値とする。 2)Ｐｉ（ｉ＝１〜４）の中央値とする。 3)Ｐｉ（ｉ＝１〜４）の最大値とする。 基地局は得られた送信電力Ｐによって通信を行う。The final maximum transmission power value P is obtained from the maximum transmission power value Pi (i = 1 to 4) thus obtained.
Ask for. Use one of the following methods to obtain the value. 1) The average value of Pi (i = 1 to 4). 2) The median value of Pi (i = 1 to 4). 3) It is the maximum value of Pi (i = 1 to 4). The base station communicates with the obtained transmission power P.
【００１３】[0013]
【実施例】図２は本発明の実施例を説明するための図で
ある。１は送信電力制御を行う基地局、２は１の隣接基
地局、３は障害物が無い場合の１と２のセル境界、４は
障害物が有る場合で１の所要受信レベルを満足するセル
の周辺、５は障害物である。基地局１、２は路上の電話
ボックスに設置されている。FIG. 2 is a diagram for explaining an embodiment of the present invention. 1 is a base station that controls transmission power, 2 is a neighboring base station of 1, 3 is a cell boundary between 1 and 2 when there is no obstacle, 4 is a cell that satisfies the required reception level of 1 when there is an obstacle 5 and 5 are obstacles. The base stations 1 and 2 are installed in a telephone box on the road.
【００１４】図３は本発明の実施例を説明するための受
信レベル図である。６は障害物が無い場合の受信レベ
ル、７は障害物が有る場合の受信レベル、８は送信電力
制御を行った場合の受信レベルである。 （１）基地局１の送信電力はＰ１で、障害物が無い場合
のセル境界３では、通信に必要な受信レベルＶｔｈが確
保されている。 （２）障害物によって伝搬損失が大きくなり、基地局１
の通信可能なエリアはセル周辺４になる。セル境界３と
セル周辺４の区間は通信が出来ない不感地となる。 （３）基地局１が送信した送信電力判定用の電波を隣接
基地局２が受信し、受信レベルＶ２は制御基地局を経由
して基地局１に連絡される。 （４）基地局１は、セル境界３において所要レベルに
（Ｖ１−Ｖ２）だけレベルが足りないことを検出し、送
信電力をＰ１からＰ２に変更する。 （５）セル境界３において必要な受信レベルＶｔｈが確
保される。FIG. 3 is a reception level diagram for explaining the embodiment of the present invention. 6 is a reception level when there is no obstacle, 7 is a reception level when there is an obstacle, and 8 is a reception level when transmission power control is performed. (1) The transmission power of the base station 1 is P1, and the reception level Vth required for communication is secured at the cell boundary 3 when there is no obstacle. (2) Propagation loss increases due to obstacles, and the base station 1
The communicable area of is around the cell 4. The section between the cell boundary 3 and the cell periphery 4 is a dead zone where communication cannot be performed. (3) The adjacent base station 2 receives the radio wave for transmission power determination transmitted by the base station 1, and the reception level V2 is notified to the base station 1 via the control base station. (4) The base station 1 detects that the level at the cell boundary 3 is lower than the required level by (V1-V2), and changes the transmission power from P1 to P2. (5) The required reception level Vth is secured at the cell boundary 3.
【００１５】[0015]
【発明の効果】以上説明したように、本発明は送信電力
の最大値を隣接基地局で受信されるレベルを基に決定す
るので、自局セル内の伝搬損失が変化した場合や、基地
局を追加、削除した場合にサービスエリア内に発生する
不感地や、必要以上の電波を送信して生じる干渉を防ぐ
ことができる。特に、路上に基地局を設置するセル構成
においては本発明は効果的である。As described above, according to the present invention, the maximum value of the transmission power is determined based on the level received by the adjacent base station. Therefore, when the propagation loss in the own cell changes or the base station changes. It is possible to prevent dead areas that occur in the service area when adding or deleting, and interference that occurs when unnecessary radio waves are transmitted. The present invention is particularly effective in a cell configuration in which a base station is installed on the road.
【図１】本発明を説明する図。FIG. 1 is a diagram illustrating the present invention.
【図２】本発明の実施例を説明する図。FIG. 2 is a diagram illustrating an example of the present invention.
【図３】本発明の実施例を説明する受信レベル図。FIG. 3 is a reception level diagram for explaining an embodiment of the present invention.
Ｐ１ 制御前の送信電力 Ｐ２ 制御後の送信電力 Ｖ１ 制御前と後の受信レベル Ｖ２ 障害物がある場合の受信レベル Ｖｔｈ 所要受信レベル １ 基地局 ２ａ，２ｂ，２ｃ，２ｄ 隣接基地局 ３ 制御基地局 ４ セル P1 Transmission power before control P2 Transmission power after control V1 Reception level before and after control V2 Reception level when there is an obstacle Vth Required reception level 1 Base stations 2a, 2b, 2c, 2d Neighboring base station 3 Control base station 4 cells
Claims (1)
れ、各セルに対応して基地局を配置し、移動局はこれら
基地局の中に１つと通信するセル式移動通信方式におい
て、 基地局は送信電力判定用電波を送信し、 該基地局に隣接する基地局は送信電力判定用電波の受信
レベルを検出し、 該基地局と隣接基地局とを制御する制御基地局において
は隣接基地局で検出した受信レベルを該基地局に連絡
し、 該基地局は連絡された受信レベルを基に自局の電信電力
値を決定することを特徴とする移動通信における送信電
力制御方式。1. A cell type mobile communication system in which a service area is composed of a plurality of cells, a base station is arranged corresponding to each cell, and a mobile station communicates with one of these base stations. The base station adjacent to the base station that transmits the transmission power determination radio wave detects the reception level of the transmission power determination radio wave, and the control base station that controls the base station and the adjacent base station is the adjacent base station. A transmission power control method in mobile communication, characterized in that the detected reception level is notified to the base station, and the base station determines a telegraphic power value of the own station based on the notified reception level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4135557A JPH05284088A (en) | 1992-04-03 | 1992-04-03 | Transmission power control system for mobile communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4135557A JPH05284088A (en) | 1992-04-03 | 1992-04-03 | Transmission power control system for mobile communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05284088A true JPH05284088A (en) | 1993-10-29 |
Family
ID=15154595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4135557A Withdrawn JPH05284088A (en) | 1992-04-03 | 1992-04-03 | Transmission power control system for mobile communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05284088A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008533857A (en) | 2005-03-10 | 2008-08-21 | クゥアルコム・インコーポレイテッド | Method and apparatus for automatically configuring a wireless communication network |
| WO2010064515A1 (en) | 2008-12-03 | 2010-06-10 | 日本電気株式会社 | Radio base station, wireless communication system, method for controlling transmission power of radio base station, and recording medium of program for controlling transmission power of radio base station |
| WO2018139541A1 (en) * | 2017-01-27 | 2018-08-02 | 日本電信電話株式会社 | Wireless communication system and wireless communication method |
-
1992
- 1992-04-03 JP JP4135557A patent/JPH05284088A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008533857A (en) | 2005-03-10 | 2008-08-21 | クゥアルコム・インコーポレイテッド | Method and apparatus for automatically configuring a wireless communication network |
| JP2012235490A (en) * | 2005-03-10 | 2012-11-29 | Qualcomm Inc | Method and apparatus for automatic configuration of wireless communication network |
| US9888393B2 (en) | 2005-03-10 | 2018-02-06 | Qualocmm Incorporated | Method and apparatus for automatic configuration of wireless communication networks |
| WO2010064515A1 (en) | 2008-12-03 | 2010-06-10 | 日本電気株式会社 | Radio base station, wireless communication system, method for controlling transmission power of radio base station, and recording medium of program for controlling transmission power of radio base station |
| US8457681B2 (en) | 2008-12-03 | 2013-06-04 | Nec Corporation | Wireless base station, wireless communication system, method for controlling transmission power of wireless base station, and storage medium of program for controlling transmission power of wireless base station |
| WO2018139541A1 (en) * | 2017-01-27 | 2018-08-02 | 日本電信電話株式会社 | Wireless communication system and wireless communication method |
| JPWO2018139541A1 (en) * | 2017-01-27 | 2019-11-14 | 日本電信電話株式会社 | Wireless communication system and wireless communication method |
| TWI691232B (en) * | 2017-01-27 | 2020-04-11 | 日商日本電信電話股份有限公司 | Wireless communication system and wireless communication method |
| US11297509B2 (en) | 2017-01-27 | 2022-04-05 | Nippon Telegraph And Telephone Corporation | Wireless communication system and wireless communication method |
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