JP3042041B2 - Zone judgment method - Google Patents
Zone judgment methodInfo
- Publication number
- JP3042041B2 JP3042041B2 JP17682491A JP17682491A JP3042041B2 JP 3042041 B2 JP3042041 B2 JP 3042041B2 JP 17682491 A JP17682491 A JP 17682491A JP 17682491 A JP17682491 A JP 17682491A JP 3042041 B2 JP3042041 B2 JP 3042041B2
- Authority
- JP
- Japan
- Prior art keywords
- base station
- mobile station
- zone
- communication
- electric field
- 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
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- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はゾ−ン判定方法に係り、
特に小ゾ−ン構成の移動通信方式において、移動局の在
圏ゾ−ン判定を行うゾ−ン判定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zone judgment method,
In particular, the present invention relates to a zone determination method for determining a zone in which a mobile station is located in a mobile communication system having a small zone configuration.
【０００２】[0002]
【従来の技術】時分割多元接続方式（ＴＤＭＡ方式）の
移動通信方式の代表的な例として自動車電話方式があ
る。ＴＤＭＡ方式においては、ゾ−ン判定の高速化及び
基地局制御装置の負荷分散の効果がある移動局によるゾ
−ン移行検出方法が比較的容易に実現可能である。2. Description of the Related Art A typical example of a time division multiple access system (TDMA system) is a mobile telephone system. In the TDMA system, a zone shift detection method by a mobile station, which has the effects of speeding up zone determination and dispersing the load on the base station control device, can be relatively easily realized.
【０００３】このゾ−ン移行検出は通信中の基地局から
の受信電界レベルと周辺ゾ−ンの基地局からの電界の受
信レベルを測定し、それらを比較することにより実現す
るのが一般的である。従来の方式ではこの通信中の基地
局の受信電界レベルは移動局が通信中の無線チャネルの
受信レベル測定に利用している。This zone shift detection is generally realized by measuring the received electric field level from the base station in communication and the received electric field level from the base station in the peripheral zone, and comparing them. It is. In the conventional method, the reception electric field level of the base station during communication is used for measuring the reception level of the radio channel during communication by the mobile station.
【０００４】また、自動車電話方式では、無線機の低消
費電力化及び、チャネル干渉軽減を目的として、対向す
る無線機が受信電界レベルの測定結果に基づいて、無線
機の送信電力を制御する方式を採用している。具体的に
は、対向する無線機からの受信電界レベルの測定結果が
無線機の送信電力より高い値の場合には、所定の伝送品
質を満足する範囲内で送信電力を下げる制御を行い、逆
に対向する無線機からの受信電界レベルの測定結果が無
線機の送信電力より低い値の場合には、最大送信電力を
越えない範囲内で移動局の送信電力を上げる制御を行
う。In the mobile telephone system, a system in which an opposite wireless device controls the transmission power of the wireless device based on the measurement result of the received electric field level for the purpose of reducing power consumption of the wireless device and reducing channel interference. Is adopted. Specifically, when the measurement result of the reception electric field level from the opposite wireless device is a value higher than the transmission power of the wireless device, control is performed to reduce the transmission power within a range that satisfies a predetermined transmission quality. If the measurement result of the received electric field level from the wireless device facing the wireless device is lower than the transmission power of the wireless device, control is performed to increase the transmission power of the mobile station within a range not exceeding the maximum transmission power.
【０００５】[0005]
【発明が解決しようとする課題】しかるに、移動局が周
辺ゾ−ンの受信電界レベルを測定する場合には、一定電
力で送信されている周波数を測定するのが望ましい。例
えば共通制御チャネルに代表されるような、常時、その
ゾ−ンで設定された最大電力で送信されている無線チャ
ネルのレベルを移動局が測定する一方、基地局が通信中
の無線チャネルの送信電力制御を行っている場合に、移
動局がレベル測定を行った場合は、基地局が送信電力制
御を行う以前の最大出力で送信した場合に比べて低く受
信される。このため、周辺ゾ−ンの受信電界レベルの方
が高くなり、移動局がゾ−ン移行していないにもかかわ
らず、移動局はゾ−ンを移行したと判断してしまい、ゾ
−ン切り換えを行ってしまうという問題があった。本発
明は上記の点に鑑みなされたもので基地局が送信電力制
御を行い、且つ移動局がゾ−ン判定を行う際に通信中の
基地局についてもゾ−ン判定用の周波数の受信レベルと
周辺の基地局の受信電界レベルの測定及び比較を行うこ
とができるゾ−ン判定方法を提供することを目的とす
る。However, when the mobile station measures the reception electric field level of the peripheral zone, it is desirable to measure the frequency transmitted at a constant power. For example, the mobile station always measures the level of a wireless channel that is being transmitted at the maximum power set in that zone, as represented by a common control channel, while transmitting a wireless channel that the base station is communicating with. When power control is performed, when the mobile station measures the level, the signal is received at a lower level than when the base station transmits at the maximum output before performing the transmission power control. For this reason, the reception electric field level of the peripheral zone becomes higher, and the mobile station determines that the zone has been shifted even though the mobile station has not shifted to the zone. There was a problem of switching. The present invention has been made in view of the above points, and when the base station performs transmission power control and the mobile station performs zone determination, the reception level of the frequency for zone determination is also applied to the base station in communication. It is an object of the present invention to provide a zone determination method capable of measuring and comparing the received electric field levels of a base station and a peripheral base station.
【０００６】[0006]
【課題を解決するための手段】図１は本発明の原理説明
図を示す。本発明は、複数の基地局でサービスエリアを
カバーし、移動局と基地局間では時分割多元接続方式
で、移動局での受信電界レベルに応じて送信出力の制御
を行う通信周波数を用いて通信を行い、移動局が通信中
に通信に使用していない時間だけ周辺基地局毎に設定さ
れ、該移動局の受信電界レベルに関わらず送信出力制御
を行わないゾーン判定用の周波数に切り換えて受信電界
レベルを測定し、その結果から移動局の在圏ゾーンを判
定する移動通信方式のゾーン判定方法において、通信中
の基地局は移動局に該通信中の基地局のゾーン判定用周
波数を送信し（ステップ１１）、移動局は測定手段によ
り、通信基地局のゾーン判定周波数の受信電界レベル及
び周辺基地局の受信電界レベルを測定し（ステップ１
２）、かつ比較してゾーン移行を判定する（ステップ１
３）。FIG. 1 is a diagram illustrating the principle of the present invention. The present invention covers a service area with a plurality of base stations, and uses a time division multiple access method between a mobile station and a base station to control transmission output according to a reception electric field level at the mobile station.
The mobile station performs communication using the communication frequency , and is set for each peripheral base station only during a time when the mobile station is not using the communication during communication , and the transmission output control is performed regardless of the reception electric field level of the mobile station.
In the zone determination method of the mobile communication system in which the reception electric field level is measured by switching to the frequency for zone determination in which the mobile station is not performed and the zone in which the mobile station is located is determined from the result, the base station in communication communicates with the mobile station. The mobile station transmits the zone determination frequency of the middle base station (step 11), and the mobile station measures the reception field level of the zone determination frequency of the communication base station and the reception field level of the peripheral base station by the measuring means (step 1).
2) and determine zone transfer by comparison (step 1)
3).
【０００７】[0007]
【作用】本発明は移動局がゾ−ン判定を行う際に、通信
中の基地局がゾ−ン判定用周波数を移動局に通知し、移
動局は受信レベルを測定する。移動局は周辺ゾ−ンの基
地局の受信電界レベルと通信中の基地局の受信電界レベ
ルを比較して、周辺ゾ−ンの基地局の受信電界レベルよ
りも通信中基地局の受信電界レベルの方が高ければゾ−
ン移行ではないと判断し、逆に周辺ゾ−ンの基地局の受
信電界レベルよりも通信中基地局の受信電界レベルの方
が低ければ、ある周辺ゾ−ンにゾ−ン移行していると判
断する。これにより、通信中無線チャネルが送信電力制
御下であっても、通信中無線チャネルと異なる送信電力
制御を行っていないゾーン判定用チャネルの受信電界レ
ベルを用いることにより正確なゾ−ン移行の判定を行う
ことができる。According to the present invention, when the mobile station makes a zone determination, the base station in communication notifies the mobile station of the zone determination frequency, and the mobile station measures the reception level. The mobile station compares the received electric field level of the base station in the peripheral zone with the received electric field level of the base station in communication, and compares the received electric field level of the base station in the peripheral zone with the received electric field level of the base station in communication. Is higher if
If the received electric field level of the communicating base station is lower than the received electric field level of the base station in the peripheral zone, the zone is shifted to a certain peripheral zone. Judge. Thus, even if the wireless channel under communication is under transmission power control, accurate zone shift determination can be made by using the reception electric field level of a zone determination channel that is not performing transmission power control different from that of the wireless channel under communication. It can be performed.
【０００８】[0008]
【実施例】図２は一般的な自動車電話システムにおける
システム構成を示す図である。同図において、移動局１
０１は基地局１０２と通信中である。また、基地局１０
３〜１０８は基地局１０２に隣接しており、基地局１０
３〜１０８には夫々ゾ−ン内で使用する共通制御チャネ
ルを少なくとも１つは設定されている。それらのチャネ
ルは常に基地局で設定できる最大の出力で送信してい
る。FIG. 2 is a diagram showing a system configuration of a general car telephone system. In the figure, mobile station 1
01 is communicating with the base station 102. Also, the base station 10
3 to 108 are adjacent to the base station 102 and the base station 10
At least one of the common control channels 3 to 108 is used in each zone. These channels always transmit at the maximum power that can be set by the base station.
【０００９】図３は本発明の一実施例の移動局の構成を
示す。移動局１０１は変調回路２０１、復調回路 ２０
２、シンセサイザ２０３、受信レベル測定回路２０４、
タイミング発生回路２０５、符号化回路２０６、制御回
路２０７、復号化回路２０８から構成される。FIG. 3 shows the configuration of a mobile station according to one embodiment of the present invention. The mobile station 101 includes a modulation circuit 201, a demodulation circuit 20
2. Synthesizer 203, reception level measurement circuit 204,
It comprises a timing generation circuit 205, an encoding circuit 206, a control circuit 207, and a decoding circuit 208.
【００１０】受信レベル測定回路２０４はタイミング発
生回路２０５からのフレ−ムタイミングに基づいて、制
御回路２０７から指定された周波数シンセサイザ２０３
の周波数を切り換えて受信レベルを測定する回路であ
る。タイミング発生回路２０５はフレ−ムタイミングを
発生する回路である。符号化回路２０６は基地局１０２
からの情報信号と制御回路２０７からの制御信号をＴＤ
ＭＡフレ−ムに多重化し、更に、無線区間で伝送するた
めに符号化する回路である。制御回路２０７は受信レベ
ル測定回路２０４からの信号や復号化回路２０８からの
復号化信号により移動局１０１を制御する。復号化回路
２０８は受信信号を復号化し、受信信号を制御信号と情
報信号に分離し、制御信号は制御回路２０７に送出し、
情報信号は移動局１０１に接続されたハンドセット（図
示せず）に出力する。The receiving level measuring circuit 204 is based on the frame timing from the timing generating circuit 205 and the frequency synthesizer 203 specified by the control circuit 207.
Is a circuit for measuring the reception level by switching the frequency of the signal. The timing generation circuit 205 is a circuit for generating a frame timing. The encoding circuit 206 is the base station 102
TD and the control signal from the control circuit 207
This is a circuit that multiplexes the data into the MA frame and further encodes the data for transmission in a wireless section. The control circuit 207 controls the mobile station 101 based on a signal from the reception level measurement circuit 204 and a decoded signal from the decoding circuit 208. The decoding circuit 208 decodes the received signal, separates the received signal into a control signal and an information signal, and sends the control signal to the control circuit 207.
The information signal is output to a handset (not shown) connected to the mobile station 101.
【００１１】図４は本発明の一実施例の移動局での測定
動作の説明図を示す。同図において、（Ａ）は移動局１
０１の受信信号を受信するタイミングを示し、（Ｂ）は
移動局１０１が受信する受信周波数のフレ−ムの区別を
示す。（Ｂ）のフレ−ムＦ１は同図（Ａ）の３０ａ〜３
０ｇのタイミングで通信に使用している無線チャネルの
周波数である。フレ−ムＦ２は通信中の基地局１０２の
共通制御チャネルの周波数である。フレ−ムＦ３〜Ｆ８
はそれぞれの周辺基地局１０３〜１０８の共通制御チャ
ネルの周波数である。FIG. 4 is an explanatory diagram of a measurement operation in a mobile station according to one embodiment of the present invention. In the figure, (A) shows the mobile station 1
01 shows the timing of receiving the received signal, and (B) shows the distinction of the frame of the reception frequency received by the mobile station 101. The frame F1 in (B) is 30a-3 in FIG.
This is the frequency of the wireless channel used for communication at the timing of 0g. Frame F2 is the frequency of the common control channel of the base station 102 in communication. Frames F3 to F8
Is the frequency of the common control channel of each of the peripheral base stations 103 to 108.
【００１２】基地局１０２では移動局１０１が通信を開
始したときに自基地局１０２で使用している共通制御チ
ャネルの周波数の１つ（Ｆ２）、及び周辺基地局１０３
〜１０８で使用している共通制御チャネルの周波数の中
からそれぞれ１つずつ周波数（Ｆ３〜Ｆ８）を移動局１
０１に通知する。移動局１０１は通信に使用していない
スロットの時間に基地局１０２から通知された周波数に
切り換えて、同図（Ａ）の３１ａ〜３１ｇのタイミング
で通信中基地局の共通制御チャネルＦ２及び周辺ゾ−ン
の基地局１０３〜１０８からの共通制御チャネルＦ３〜
Ｆ８の信号を受信し、これらの受信電界レベルを測定す
る。In the base station 102, one of the frequencies (F2) of the common control channel used by the base station 102 when the mobile station 101 starts communication, and the peripheral base station 103
The mobile station 1 assigns one frequency (F3 to F8) from among the frequencies of the common control channels used by
Notify 01. The mobile station 101 switches to the frequency notified from the base station 102 at the time of the slot not used for communication, and switches the common control channel F2 and the peripheral zone of the base station during communication at the timings 31a to 31g in FIG. Common control channels F3 to
The signal of F8 is received, and these received electric field levels are measured.
【００１３】図５は本発明の一実施例のシ−ケンスを示
す。図５のシ−ケンスと共に本実施例の動作を説明す
る。基地局１０２は移動局１０１にゾ−ン判定用周波数
を通知する（ステップ500）。移動局１０１は図４に示
すように、通信中の基地局１０２の共通制御チャネル周
波数Ｆ２の受信電界レベルを測定し、制御回路２０７内
のメモリに記憶する（ステップ501 ）。さらにＴＤＭＡ
の通信中でないタイムスロット時に周辺基地局１０３〜
１０８それぞれの制御チャネルの周波数Ｆ３〜Ｆ８に切
り換えて周辺基地局１０３〜１０８の受信電界レベルを
測定し、制御回路２０７内のメモリに記憶する（ステッ
プ502 ）。次に移動局１０１は周辺ゾ−ンの基地局１０
３〜１０８の受信レベルと通信中の基地局１０２の受信
レベルを比較して、周辺ゾ−ンの基地局１０３〜１０８
が通信中の基地局１０２よりも受信レベルが高ければゾ
−ン移行と判断する。逆に周辺ゾ−ンの基地局１０３〜
１０８が通信中の基地局１０２よりも受信レベルが低け
ればゾ−ン移行ではないと判断する（ステップ503 ）。FIG. 5 shows a sequence according to an embodiment of the present invention. The operation of this embodiment will be described with reference to the sequence of FIG. The base station 102 notifies the mobile station 101 of the zone determination frequency (step 500). As shown in FIG. 4, the mobile station 101 measures the received electric field level of the common control channel frequency F2 of the communicating base station 102 and stores it in the memory in the control circuit 207 (step 501). Further TDMA
During a time slot when communication is not in progress,
The frequency of each of the control channels 108 is switched to F3 to F8, and the received electric field levels of the peripheral base stations 103 to 108 are measured and stored in the memory in the control circuit 207 (step 502). Next, the mobile station 101 is connected to the base station 10 in the peripheral zone.
By comparing the reception levels of the base stations 102 and 103 with the base stations 103 and 108 in the peripheral zone, the reception levels of the base stations 102 and 103 in communication are compared.
If the reception level is higher than that of the base station 102 in communication, it is determined that the zone has been shifted. Conversely, the base station 103 of the peripheral zone
If the reception level is lower than that of the base station 102 during communication, it is determined that the operation is not zone transition (step 503).
【００１４】本発明で用いたゾ−ン判定用周波数は通信
中の基地局１０２が送信電力制御を行わず、常に最大送
信電力で送信されている共通制御チャネルに設定されて
おり、通信中の無線チャネルが送信電力制御下でも通信
中の基地局１０２から移動局１０１にこのゾ−ン判定用
周波数を通知することにより、基地局１０２が通信中の
無線チャネルの送信電力制御を行っている場合に、移動
局１０１がレベル測定を行うと、基地局１０２が送信電
力制御を行う以前の最大出力で送信したときに比べて低
いレベルで受信されるという問題が解決され、正確なゾ
−ン移行判定を行うことが可能となる。The zone determination frequency used in the present invention is set to a common control channel that is always transmitted at the maximum transmission power without the base station 102 during communication performing transmission power control. A case where the base station 102 controls the transmission power of the radio channel during communication by notifying the mobile station 101 of the zone determination frequency from the base station 102 during communication even when the radio channel is under transmission power control. In addition, when the mobile station 101 measures the level, the problem that the signal is received at a lower level than when the base station 102 transmits the signal at the maximum output before the transmission power control is performed is solved. It is possible to make a determination.
【００１５】なお、基地局１０２においてゾ−ン判定用
のキャリアの送信電力を変更する方法がある。例えば特
定のエリアのみにトラヒックが集中している場合は基地
局１０２の送信電力を下げる制御を行えば移動局１０１
をチャネル切り換えにより周辺の基地局１０３〜１０８
のいずれかのトラヒックが集中していないゾ−ンに分散
させることができる。逆に周辺の基地局１０３〜１０８
にトラヒックが集中していない場合には通信中の基地局
１０２の送信電力を上げる制御を行えば周辺基地局への
チャネル切り換え頻度を抑えることができる。There is a method in which the base station 102 changes the transmission power of the carrier for zone determination. For example, when traffic is concentrated only in a specific area, the mobile station 101 can be controlled by lowering the transmission power of the base station 102.
Are changed to the neighboring base stations 103 to 108 by channel switching.
Can be distributed to zones where no traffic is concentrated. Conversely, neighboring base stations 103 to 108
When traffic is not concentrated in the base station, if the control to increase the transmission power of the communicating base station 102 is performed, the frequency of channel switching to the peripheral base station can be suppressed.
【００１６】[0016]
【発明の効果】本発明によれば基地局で送信電力制御を
行い、且つ通信中基地局と周辺基地局との受信電界レベ
ルの比較を行うことが可能になる。更に、ゾ−ン判定用
のキャリアの送信電力を制御することにより特定のエリ
アにトラヒックが集中することを防止できるために、基
地局密度を一定に近い状態で利用でき、効率の良い通信
が確保でき、実用上極めて有用である。According to the present invention, it becomes possible to perform transmission power control at the base station and to compare the received electric field levels of the base station during communication and the surrounding base stations. Further, by controlling the transmission power of the carrier for zone determination, it is possible to prevent traffic from concentrating on a specific area, so that the base station density can be used near a constant level and efficient communication can be secured. It is very useful in practice.
【図１】本発明の原理説明図である。FIG. 1 is a diagram illustrating the principle of the present invention.
【図２】一般的な自動車電話方式におけるシステム構成
図である。FIG. 2 is a system configuration diagram in a general car telephone system.
【図３】本発明の一実施例の移動局の構成図である。FIG. 3 is a configuration diagram of a mobile station according to an embodiment of the present invention.
【図４】本発明の一実施例の移動局での測定動作の説明
図である。FIG. 4 is an explanatory diagram of a measurement operation in a mobile station according to one embodiment of the present invention.
【図５】本発明の一実施例のシ−ケンスを示す図であ
る。FIG. 5 is a diagram showing a sequence according to an embodiment of the present invention.
１０１ 移動局 １０２〜１０８ 基地局 ２０１ 変調回路 ２０２ 復調回路 ２０３ シンセサイザ ２０４ 受信レベル測定回路 ２０５ タイミング発生回路 ２０６ 符号化回路 ２０７ 制御回路 ２０８ 復号化回路 Reference Signs List 101 mobile station 102 to 108 base station 201 modulation circuit 202 demodulation circuit 203 synthesizer 204 reception level measurement circuit 205 timing generation circuit 206 encoding circuit 207 control circuit 208 decoding circuit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/24 - 7/26 102 H04Q 7/00 - 7/38 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H04B 7/ 24-7/26 102 H04Q 7/ 00-7/38
Claims (1)
し、移動局と基地局間では時分割多元接続方式で、移動
局での受信電界レベルに応じて送信出力の制御を行う通
信周波数を用いて通信を行い、移動局が通信中に通信に
使用していない時間だけ周辺基地局毎に設定され、該移
動局の受信電界レベルに関わらず送信出力制御を行わな
いゾーン判定用の周波数に切り換えて受信電界レベルを
測定し、その結果から移動局の在圏ゾーンを判定する移
動通信方式のゾーン判定方法において、 通信中の基地局は前記移動局に該通信中の基地局のゾー
ン判定用周波数を送信し、 前記移動局は測定手段により、該通信中基地局のゾーン
判定周波数の受信電界レベル及び周辺基地局の受信電界
レベルを測定し、かつ比較してゾーン移行を判定するこ
とを特徴とするゾーン判定方法。1. A service area is covered by a plurality of base stations, and a mobile station and a base station use a time division multiple access method to move
Communication power for controlling the transmission output according to the reception electric field level at the station
Communicates with signal frequency, the mobile station is set by each peripheral base station time not used for the communication during the communication,該移
Do not perform transmission output control regardless of the reception electric field level of the mobile station.
In the zone determination method of the mobile communication system in which the reception electric field level is measured by switching to a frequency for zone determination and the zone where the mobile station is located is determined from the result, the base station in communication with the mobile station communicates with the mobile station. The mobile station transmits the zone determination frequency of the base station of the base station, and the mobile station measures the reception electric field level of the zone determination frequency of the base station during communication and the reception electric field level of the peripheral base station by the measuring means, and compares and measures the zone. A zone determination method characterized by determining a shift .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17682491A JP3042041B2 (en) | 1990-11-30 | 1991-07-17 | Zone judgment method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33638090 | 1990-11-30 | ||
| JP2-336380 | 1990-11-30 | ||
| JP17682491A JP3042041B2 (en) | 1990-11-30 | 1991-07-17 | Zone judgment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04347939A JPH04347939A (en) | 1992-12-03 |
| JP3042041B2 true JP3042041B2 (en) | 2000-05-15 |
Family
ID=26497594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17682491A Expired - Fee Related JP3042041B2 (en) | 1990-11-30 | 1991-07-17 | Zone judgment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3042041B2 (en) |
-
1991
- 1991-07-17 JP JP17682491A patent/JP3042041B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04347939A (en) | 1992-12-03 |
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