JPH0653901A - Idle channel detecting method - Google Patents
Idle channel detecting methodInfo
- Publication number
- JPH0653901A JPH0653901A JP4204719A JP20471992A JPH0653901A JP H0653901 A JPH0653901 A JP H0653901A JP 4204719 A JP4204719 A JP 4204719A JP 20471992 A JP20471992 A JP 20471992A JP H0653901 A JPH0653901 A JP H0653901A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- channel
- interference wave
- wave level
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基地局と移動局が通信
を行う移動通信システムにおける、空きチャネル検出に
係る制御方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for detecting a free channel in a mobile communication system in which a base station and a mobile station communicate with each other.
【０００２】[0002]
【従来の技術】移動通信システムにおいては、限られた
数の通信チャネルを有効に用いることによって移動局数
（利用者数）を増やすことができるためチャネルの有効
利用を図ることは重要である。チャネルの有効利用を図
るために、基地局ごとに予めいつでも使用可能なチャネ
ルを割り当てておく方法（固定チャネル割当）に対し
て、基地局ごとの割り当ては行わずそのつど使用できる
チャネルを探し出して用いる方法（ダイナミックチャネ
ル割当の適応的再利用法）が考えられている。2. Description of the Related Art In a mobile communication system, it is important to effectively use channels because the number of mobile stations (the number of users) can be increased by effectively using a limited number of communication channels. In order to make effective use of channels, a method of allocating channels that can be used at any time in advance to each base station (fixed channel allocation) is used, instead of allocating each base station, a channel that can be used is searched for and used. A method (adaptive reuse method of dynamic channel assignment) is considered.
【０００３】適応的再利用法の具体例として、システム
が持っている全チャネルの中から任意の順でチャネルの
干渉波レベルを測定し、レベルが一定値以下のチャネル
を空きチャネルと判断して、そのチャネルを用いる方法
が従来から考えられていた。As a concrete example of the adaptive reuse method, the interference wave levels of the channels are measured in an arbitrary order from all the channels of the system, and a channel whose level is below a certain value is judged as an empty channel. The method of using the channel has been conventionally considered.
【０００４】しかし、この従来の方法では、最初に検出
した空きチャネルが全空きチャネルの中で最適のチャネ
ルである保証はない。すなわち、適応的再利用法では固
定チャネル割当と違って、通信中に干渉障害を与えられ
る危険が高いからである。この意味で、空きチャネルの
中でも、最も条件の良い空きチャネルを用いることが望
まれる。However, in this conventional method, there is no guarantee that the first detected empty channel is the optimum channel among all the empty channels. That is, in the adaptive reuse method, unlike fixed channel allocation, there is a high risk of interference interference during communication. In this sense, it is desirable to use the free channel with the best conditions among the free channels.
【０００５】[0005]
【発明が解決しようとする課題】図３は干渉障害につい
て説明する図である。以下同図を用いて、前記、適応的
再利用法が通信中に干渉障害を与えられる危険が高いこ
とを説明する。同図において、１と２は基地局、３と４
は基地局１，２と通信を行う移動局、５，６は移動局
３，４の希望波、７は移動局４の干渉波を表わしてい
る。移動局４が基地局１から遠い場所にいる時は干渉波
７のレベルＬ−Ｃｏが小さいので、基地局１は移動局３
に移動局４と同じチャネルを選択し与える。しかし、移
動局４が基地局１に近づいて来た場合には、干渉波７の
レベルＨ−Ｃｏが高くなり干渉障害を生ずる。FIG. 3 is a diagram for explaining the interference failure. Hereinafter, with reference to the same figure, it will be explained that the adaptive reuse method has a high risk of interference interference during communication. In the figure, 1 and 2 are base stations, and 3 and 4
Is a mobile station communicating with the base stations 1 and 2, 5 and 6 are desired waves of the mobile stations 3 and 4, and 7 is an interference wave of the mobile station 4. Since the level L-Co of the interference wave 7 is small when the mobile station 4 is located far from the base station 1, the base station 1 moves to the mobile station 3
The same channel as that of the mobile station 4 is selected and given. However, when the mobile station 4 approaches the base station 1, the level H-Co of the interference wave 7 becomes high, causing interference interference.
【０００６】最適な空きチャネルを検出する為に、各基
地局のチャネル使用状況を連絡してもらう方法が考えら
れるが、これでは基地局の制御量が増加してしまう欠点
がある。また、干渉波レベルの測定下限を下げて低い値
まで測定し、測定値に従って空きチャネルに順位を付け
ることが考えられるが、この方法では全チャネルの測定
を行わなければならないから制御量が増大する。そのた
め、基地局の制御量を増加させずに、また、数多くの干
渉波レベル測定を行わないで、最適な空きチャネルを検
出する方法の出現が望まれていた。[0006] In order to detect the optimum free channel, a method of informing the channel usage status of each base station can be considered, but this has a drawback that the control amount of the base station increases. It is also possible to lower the lower limit of the interference wave level and measure it to a lower value, and rank the empty channels according to the measured value, but this method requires measurement of all channels, which increases the control amount. . Therefore, there has been a demand for the appearance of a method for detecting an optimum empty channel without increasing the control amount of the base station and without performing many interference wave level measurements.
【０００７】本発明は、干渉波レベルを測定して空きチ
ャネルを検出する方法において、基地局の制御量を増加
させず、少ないチャネルの測定によって、最適な空きチ
ャネルを検出することのできる手段を提供することを目
的としている。The present invention provides a method for detecting an optimal empty channel by measuring the number of channels without increasing the control amount of the base station in the method of measuring the interference wave level and detecting the empty channel. It is intended to be provided.
【０００８】[0008]
【課題を解決するための手段】本発明によれば、上述の
目的は、前記特許請求の範囲に記載した手段により達成
される。According to the invention, the above mentioned objects are achieved by means of the patent claims.
【０００９】すなわち、本発明は、サービスエリアが複
数のセルで構成され、各セルに基地局を配置し、複数の
移動局とこれら基地局が通信を行う為のチャネルを複数
具備し、基地局または移動局が干渉波レベルを測定して
干渉波レベルが一定値以下の空きチャネルを用いて通信
を行う移動通信方式において、干渉波レベルを測定する
チャネルの順番テーブルを複数種類用意し、一定距離離
れた基地局ごとに同じ順番テーブルを割当て、割当られ
た順番テーブルに従って干渉波レベルを基地局または移
動局で測定し、移動局が干渉波レベルを測定する場合に
は、該移動局に基地局から順番テーブルを通知し、基地
局または移動局が、順番テーブルに従って最初に検出し
た空きチャネルを通信に用いる移動通信の空きチャネル
検出方法である。That is, according to the present invention, a service area is composed of a plurality of cells, a base station is arranged in each cell, and a plurality of mobile stations and a plurality of channels for these base stations to communicate with each other are provided. Alternatively, in a mobile communication system in which a mobile station measures an interference wave level and communicates using an empty channel whose interference wave level is a certain value or less, multiple types of order tables of channels for measuring the interference wave level are prepared and a fixed distance is set. The same order table is assigned to each distant base station, the interference wave level is measured by the base station or the mobile station according to the assigned order table, and when the mobile station measures the interference wave level, the base station is assigned to the mobile station. Is a method for detecting an empty channel of a mobile communication, in which the base station or the mobile station uses the first empty channel detected in accordance with the order table for communication.
【００１０】[0010]
【作用】従来は、干渉波レベル測定時に空きチャネルと
判断されたチャネルなら任意のチャネルを用いていた。
しかし、同じ空きチャネルでも条件の良いチャネルとそ
うでないチャネルがある。本発明のように、同一チャネ
ルを繰り返して使用できる距離だけ離れた基地局（以下
繰り返し基地局ともいう）毎に測定順番が同じであるテ
ーブルを与え、その他の基地局には異なるテーブルを与
えることによって、繰り返し基地局でも優先順位の高い
チャネルが使用される確率が高くなり、繰り返し基地局
で使用されているチャネルは自基地局でも使用できるの
で少ない測定回数で空きチャネルを検出できる。In the past, any channel was used if it was determined to be an empty channel when measuring the interference wave level.
However, some channels have the same free channel and some do not. As in the present invention, a table in which the measurement order is the same is provided for each base station (hereinafter also referred to as a repeat base station) that is separated by a distance in which the same channel can be used repeatedly, and different tables are provided to other base stations. As a result, the probability that a channel with a high priority is used repeatedly also increases, and the channel used by the repeated base station can also be used by the own base station, so that an empty channel can be detected with a small number of measurements.
【００１１】また、最適なチャネルであろうと考えられ
る順番に干渉測定を行うことによって、最初に検出した
空きチャネルが最適空きチャネルである可能性は高くな
る。図１は本発明の作用を説明する図である。同図にお
いて、２１〜２３は基地局、２４〜２７は移動局、２８
〜３０は基地局２１〜２３に対応するエリアを表わして
いる。基地局２１と２３は同一チャネルの繰り返しが可
能とし、基地局２１が移動局２４に割り当てる空きチャ
ネルを検出するものとする。今、各基地局は任意の順番
で空きチャネルを検出するとし、例えば、各基地局とも
チャネルｃｈ１，２，３，…の順番で検出すると考える
〔図１（ｂ）〕。Further, by performing the interference measurement in the order considered to be the optimum channel, it is highly possible that the first detected free channel is the optimum free channel. FIG. 1 is a diagram for explaining the operation of the present invention. In the figure, 21-23 are base stations, 24-27 are mobile stations, 28
˜30 represent areas corresponding to the base stations 21 to 23. It is assumed that the base stations 21 and 23 can repeat the same channel, and the base station 21 detects an empty channel assigned to the mobile station 24. Now, assume that each base station detects an empty channel in an arbitrary order, and for example, each base station detects channels ch1, 2, 3, ... In the order [FIG. 1 (b)].
【００１２】基地局２２はチャネルｃｈ１，２を使用
し、基地局２３はチャネルｃｈ３を使用している。基地
局２１はチャネルｃｈ１から測定を行い、チャネルｃｈ
４で初めて空きチャネルを検出できる。次に本発明のよ
うに繰り返し基地局には同じ順番テーブルを、繰り返し
できない基地局には異なるテーブルを与える場合を考え
る。例えば、基地局２１，２３の空きチャネル検出順番
はｃｈ１，２，３，…で、基地局２２はｃｈ５，６，
７，…の順番とする〔図１（ｃ）〕。The base station 22 uses channels ch1 and ch2, and the base station 23 uses channel ch3. The base station 21 measures from channel ch1 and
No. 4 can detect an empty channel for the first time. Next, consider the case where the same order table is repeatedly given to base stations and different tables are given to non-repeatable base stations as in the present invention. For example, the base stations 21 and 23 have ch1, ch2, ch3, ch ...
The order is 7, ... [Fig. 1 (c)].
【００１３】基地局２２はチャネルｃｈ５，６を使用
し、基地局２３はチャネルｃｈ１を使用することになる
ので、基地局２１は最初に空きチャネルｃｈ１を検出で
きる。このように本発明によれば少ない測定回数で空き
チャネルを検出できる。Since the base station 22 uses the channels ch5 and 6 and the base station 23 uses the channel ch1, the base station 21 can detect the empty channel ch1 first. As described above, according to the present invention, an empty channel can be detected with a small number of measurements.
【００１４】次に、図１（ａ）において図１（ｂ）に示
す順番テーブルを用いた場合、基地局２２と移動局２６
はチャネルｃｈ２を用いるが、両局の距離が短いため送
信電力制御によって送信電力が小さく抑えられているの
で、基地局２１で測定したｃｈ２の干渉波レベルが一定
値以下であることが多く、そのため、空きチャネルと判
断され、基地局２１で使用される可能性がある。Next, when the order table shown in FIG. 1B is used in FIG. 1A, the base station 22 and the mobile station 26 are used.
Channel ch2 is used, but the transmission power is suppressed to a low level by the transmission power control because the distance between the two stations is short. Therefore, the interference wave level of ch2 measured by the base station 21 is often less than a certain value. , There is a possibility that the channel is determined to be an empty channel and used by the base station 21.
【００１５】しかし、移動局２６がエリア外周に移動し
送信電力が大きくなった場合は干渉障害を与えられる危
険がある。このように、最初に検出したチャネルが必ず
しも最適ではない。図１（ｃ）に示す順番テーブルを用
いた場合では、最初に検出するのが繰り返し基地局２３
で使用しているチャネルｃｈ１なので最適チャネルであ
る。However, when the mobile station 26 moves to the outer periphery of the area and the transmission power increases, there is a risk of interference interference. Thus, the first detected channel is not always optimal. In the case of using the order table shown in FIG. 1 (c), it is the base station 23 that first detects the repeat
Since it is the channel ch1 used in, it is the optimum channel.
【００１６】[0016]
【実施例】図２（ａ）は本発明の一実施例を説明する図
である。同図において、４１は基地局を、４２は基地局
のエリアを表わしている。同じ記号（Ａ，Ｂ，Ｃ）の基
地局は同一チャネルを繰り返すことができる。図２
（ｂ）に空きチャネル検出順番テーブル表を示す。基地
局Ａではチャネルｃｈ１〜１０，２０，３０，１９，２
９，…１１，２１の順番の、基地局Ｂではチャネルｃｈ
１１〜２０，３０，１０，２９，９，…２１，１の順番
の、基地局Ｃではチャネルｃｈ２１〜３０，１０，２
０，９，１９，…１，１１の順番の空きチャネルを検出
するテーブルを与える。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2A is a diagram for explaining an embodiment of the present invention. In the figure, 41 indicates a base station and 42 indicates an area of the base station. Base stations having the same symbol (A, B, C) can repeat the same channel. Figure 2
An empty channel detection order table table is shown in (b). In the base station A, channels ch1 to 10, 20, 30, 19, 2
Channel ch in base station B in the order of 9, ...
Channels 21 to 30, 10, 2 in the base station C in the order of 11 to 20, 30, 10, 29, 9, ...
A table for detecting empty channels in the order of 0, 9, 19, ...
【００１７】トラフィック量が少なく、各基地局が使
用しているチャネル数が１０ｃｈ以下である場合を考え
る。例えば、基地局４１はチャネルｃｈ１〜５まで使用
している時は、空きチャネル検出をｃｈ６から始める。
各基地局は検出順番テーブルに従って空きチャネルを割
り当てるので、使用されているチャネルは基地局Ａはｃ
ｈ１から、基地局Ｂはｃｈ１１から、基地局Ｃはｃｈ２
１から埋まっている可能性が高い。トラフィックが少な
い時は、基地局ＢやＣでｃｈ１〜１０を使用している可
能性は低いので、ｃｈ６は空きチャネルである可能性は
高い。ｃｈ６が空きチャネルであれば最初の測定で空き
チャネルを検出できる。Consider a case where the amount of traffic is small and the number of channels used by each base station is 10 ch or less. For example, when the base station 41 is using the channels ch1 to ch5, the idle channel detection is started from ch6.
Since each base station allocates an empty channel according to the detection order table, the used channel is c
From h1, base station B from ch11, base station C from ch2
There is a high possibility that it is filled from 1. When the traffic is light, it is unlikely that the base stations B and C are using ch1 to ch10. Therefore, ch6 is highly likely to be an empty channel. If ch6 is an empty channel, the empty channel can be detected in the first measurement.
【００１８】トラフィク量が多く、基地局４１の使用
しているチャネルがｃｈ１〜１０である場合を考える。
全ての基地局が１０チャネル使用していればこれはシス
テム容量の限界なので空きチャネルはないが、１０チャ
ネル以下の基地局があれば空きチャネルが存在する可能
性はある。基地局Ｂはｃｈ１１から埋めてゆくので、ｃ
ｈ１１〜２０の中ではｃｈ２０が最も使用されていない
確率が高い。同様に基地局Ｃはｃｈ３０が空いている確
率が高い。その為基地局Ａはｃｈ２０，３０，１９，２
９…の順で測定を行えば少ない測定回数で空きチャネル
を検出できる。Consider a case where the traffic volume is large and the channels used by the base station 41 are ch1 to ch10.
If all base stations use 10 channels, there is no free channel because this is the limit of the system capacity, but if there are base stations of 10 channels or less, there is a possibility that there are free channels. Base station B will be filled from ch11, so c
It is highly probable that ch20 is least used among h11 to h20. Similarly, the base station C has a high probability that ch30 is vacant. Therefore, the base station A is ch 20, 30, 19, 2
If the measurements are performed in the order of 9 ..., an empty channel can be detected with a small number of measurements.
【００１９】[0019]
【発明の効果】以上説明したように本発明によれば、干
渉波レベルを測定して空きチャネルを検出する方法にお
いて、同一チャネル繰り返しのできる基地局に同じ空き
チャネル検出順番テーブルを与えることによって、基地
局の制御量を増加させず、少ないチャネルの干渉測定に
よって、最適な空きチャネルを検出できるようになる。
本発明は、１基地局当たりのチャネル数が少なくシステ
ム内の基地局数が多い極小セル構成の移動通信システ
ム、例えば、パーソナル通信システムなどにおいて特に
効果を発揮することができる。As described above, according to the present invention, in the method of measuring the interference wave level and detecting the empty channel, by giving the same empty channel detection order table to the base stations that can repeat the same channel, It is possible to detect the optimum free channel by measuring the interference of a small number of channels without increasing the control amount of the base station.
INDUSTRIAL APPLICABILITY The present invention can be particularly effective in a mobile communication system having a very small cell configuration, in which the number of channels per base station is small and the number of base stations in the system is large, for example, a personal communication system.
【図１】本発明の作用を説明する図である。FIG. 1 is a diagram illustrating an operation of the present invention.
【図２】本発明の一実施例を説明する図である。FIG. 2 is a diagram illustrating an embodiment of the present invention.
【図３】干渉障害について説明する図である。FIG. 3 is a diagram illustrating an interference failure.
１，２，２１〜２３，４１ 基地局 ３，４，２４〜２７ 移動局 ５，６ 希望波 ７ 干渉波 ２８〜３０，４２ 基地局のエリア 1,2,21-23,41 Base station 3,4,24-27 Mobile station 5,6 Desired wave 7 Interference wave 28-30,42 Base station area
Claims (1)
れ、各セルに基地局を配置し、複数の移動局とこれら基
地局が通信を行う為のチャネルを複数具備し、基地局ま
たは移動局が干渉波レベルを測定して干渉波レベルが一
定値以下の空きチャネルを用いて通信を行う移動通信方
式において、 干渉波レベルを測定するチャネルの順番テーブルを複数
種類用意し、一定距離離れた基地局ごとに同じ順番テー
ブルを割当て、割当られた順番テーブルに従って干渉波
レベルを基地局または移動局で測定し、 移動局が干渉波レベルを測定する場合には、該移動局に
基地局から順番テーブルを通知し、 基地局または移動局が、順番テーブルに従って最初に検
出した空きチャネルを通信に用いることを特徴とする移
動通信の空きチャネル検出方法。1. A service area is composed of a plurality of cells, a base station is arranged in each cell, and a plurality of mobile stations and a plurality of channels for communicating with these base stations are provided. In a mobile communication system in which the interference wave level is measured and communication is performed using idle channels whose interference wave level is below a certain value, multiple types of channel order tables for measuring the interference wave level are prepared, and base stations separated by a certain distance. The same order table is assigned for each, and the interference wave level is measured by the base station or mobile station according to the assigned order table.When the mobile station measures the interference wave level, the order table is assigned to the mobile station from the base station. A free channel detection method for mobile communication, characterized in that the base station or mobile station uses the first free channel detected according to the order table for communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4204719A JPH0653901A (en) | 1992-07-31 | 1992-07-31 | Idle channel detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4204719A JPH0653901A (en) | 1992-07-31 | 1992-07-31 | Idle channel detecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0653901A true JPH0653901A (en) | 1994-02-25 |
Family
ID=16495181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4204719A Pending JPH0653901A (en) | 1992-07-31 | 1992-07-31 | Idle channel detecting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0653901A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5752192A (en) * | 1994-12-05 | 1998-05-12 | Nec Corporation | Channel reuse in cellular mobile communication with interference signal levels of different radio channels measured at regular and shorter refresh intervals |
| US20110100676A1 (en) * | 2008-02-26 | 2011-05-05 | Mitsubishi Shindoh Co., Ltd. | High strength and high conductivity copper alloy rod or wire |
-
1992
- 1992-07-31 JP JP4204719A patent/JPH0653901A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5752192A (en) * | 1994-12-05 | 1998-05-12 | Nec Corporation | Channel reuse in cellular mobile communication with interference signal levels of different radio channels measured at regular and shorter refresh intervals |
| US20110100676A1 (en) * | 2008-02-26 | 2011-05-05 | Mitsubishi Shindoh Co., Ltd. | High strength and high conductivity copper alloy rod or wire |
| US9512506B2 (en) * | 2008-02-26 | 2016-12-06 | Mitsubishi Shindoh Co., Ltd. | High strength and high conductivity copper alloy rod or wire |
| US10163539B2 (en) | 2008-02-26 | 2018-12-25 | Mitsubishi Shindoh Co., Ltd. | High strength and high conductivity copper alloy rod or wire |
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