JPH08331628A - Reception frequency scanning method for mobile communication system - Google Patents
Reception frequency scanning method for mobile communication systemInfo
- Publication number
- JPH08331628A JPH08331628A JP7136932A JP13693295A JPH08331628A JP H08331628 A JPH08331628 A JP H08331628A JP 7136932 A JP7136932 A JP 7136932A JP 13693295 A JP13693295 A JP 13693295A JP H08331628 A JPH08331628 A JP H08331628A
- Authority
- JP
- Japan
- Prior art keywords
- reception
- scanning
- channels
- frequency
- mobile communication
- 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- Withdrawn
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は移動体通信システムの受
信周波数走査方法に関し、セルラー方式のシステムでサ
ービスエリア圏外で端末機が通信可能なセルを探す受信
周波数走査方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reception frequency scanning method for a mobile communication system, and more particularly to a reception frequency scanning method for searching a cell with which a terminal can communicate outside a service area in a cellular system.
【０００２】[0002]
【従来の技術】移動体通信システムは、１つのサービス
エリアを１つのゾーンでカバーする大ゾーン方式と、多
数の小さなゾーンで構成する小ゾーン方式とに大別され
る。小ゾーンはセルと呼ばれ、小ゾーン方式はセルラー
方式とも呼ばれ、チャネル数が多くとれるので自動車電
話等に使われる。2. Description of the Related Art Mobile communication systems are roughly classified into a large zone system in which one service area is covered by one zone and a small zone system in which a large number of small zones are used. The small zone is called a cell, and the small zone method is also called a cellular method. Since it has a large number of channels, it is used for car phones and the like.
【０００３】セルラー方式では図４に示す如くサービス
エリア１０は中心に基地局１２1 〜１２n を配置した複
数のセル１１1 〜１１n で構成されている。各基地局１
２1〜１２n から端末機に対する下り信号は異なる周波
数ｆ1 〜ｆn が設定されている。サービスエリア１０の
圏外にある端末機１３では、従来、図５に示す処理を実
行してサービスエリア圏内圏外判定を行っている。In the cellular system, as shown in FIG. 4, the service area 10 is composed of a plurality of cells 11 1 to 11 n with base stations 12 1 to 12 n arranged at the center. Each base station 1
Downlink signals from 2 1 to 12 n to the terminal are set to different frequencies f 1 to f n . In the terminal 13 outside the service area 10, conventionally, the process shown in FIG. 5 is executed to determine whether the terminal is out of the service area.
【０００４】図５において、ステップＳ１０では受信部
の電源をオンとする。次にステップＳ１２で受信周波数
をｆ1 からｆn まで順に切換え、各基地局１２1 〜１２
n 夫々の下り信号を受信周波数走査する。この後、ステ
ップＳ１４で所定の基準レベル以上の下り信号があるか
否かを判別する。In FIG. 5, in step S10, the power of the receiving section is turned on. Next, in step S12, the reception frequencies are sequentially switched from f 1 to f n , and the respective base stations 12 1 to 12
The n each downlink signal scanning the reception frequency. Then, in step S14, it is determined whether or not there is a downlink signal having a predetermined reference level or higher.
【０００５】ここで基準レベル以上の下り信号がない場
合はステップＳ１６で圏外判定を行い、ステップＳ１８
で受信部の電源をオフとし、ステップＳ２０でタイマに
より所定時間を計時して待機した後、ステップＳ１０に
進む。一方、ステップＳ１４で基準レベル以上の下り信
号がある場合はステップＳ２２に進み、基準レベル以上
の下り信号を受信して、そのなかの報知情報を受信す
る。次にステップＳ２４で報知情報を正常に受信できた
か否かを判別し、正常に受信できない場合はステップＳ
１６に進んで圏外判定を行い、正常に受信できた場合は
ステップＳ２６で圏外判定を行って処理を終了する。If there is no downlink signal higher than the reference level, the out-of-range determination is made in step S16, and step S18 is performed.
At step S20, the power of the receiving unit is turned off, and at step S20, a timer measures a predetermined time and waits, and then the process proceeds to step S10. On the other hand, if there is a downlink signal of the reference level or more in step S14, the process proceeds to step S22, the downlink signal of the reference level or more is received, and the broadcast information therein is received. Next, in step S24, it is determined whether or not the notification information has been normally received.
In step S26, the out-of-range determination is performed, and if the signal is normally received, the out-of-range determination is performed in step S26 and the process ends.
【０００６】[0006]
【発明が解決しようとする課題】ところで、日本のディ
ジタル自動車電話システムでは下り信号の周波数の数で
あるとまり木チャネル数ｎは最大８０であり、セルラー
方式の繰り返しエリア数に等しい。これに対し、圏内に
おいて、現在端末機が位置しているセルの周辺にあるセ
ルの下り信号の周波数、つまり圏内の周辺チャネルはｆ
ｃ1 〜ｆｃm であり、周辺チャネル数ｍは日本のディジ
タル自動車電話の場合、最大２０である。By the way, in the Japanese digital car telephone system, the number n of perch channels, which is the number of frequencies of downlink signals, is 80 at maximum, which is equal to the number of repeating areas of the cellular system. On the other hand, in the area, the frequency of the downlink signal of the cell around the cell in which the terminal is currently located, that is, the peripheral channel in the area is f
c 1 to fc m , and the number of peripheral channels m is 20 at maximum in the case of a Japanese digital car telephone.
【０００７】従来は圏外にある端末機では圏内、圏外判
定を行うために、図６に示す如く周波数ｆ1 〜ｆn のｎ
チャネルの周波数走査つまり全チャネル走査を毎回行う
ために消費電力が大きいという問題があった。また、周
波数走査で受信レベルが基準レベル未満であれば、この
周波数を無視しており、受信レベルが基準レベル近くま
で上昇している周波数においても、所定時間を経過して
次の周波数走査が行われるまでこの周波数の検出、つま
り圏内判定を行うことができず、圏内判定に時間がかか
るという問題があった。Conventionally, in order to determine whether the terminal is out of the service area or out of service area, as shown in FIG. 6, n of frequencies f 1 to f n is used.
There is a problem that power consumption is large because frequency scanning of channels, that is, all-channel scanning is performed every time. If the reception level is less than the reference level in the frequency scan, this frequency is ignored, and even if the reception level rises close to the reference level, the next frequency scan will be performed after a predetermined time. There is a problem in that it is not possible to detect this frequency, that is, to make a judgment on the area until it is heard, and it takes time to judge the area.
【０００８】本発明は上記の点に鑑みなされたもので、
サービスエリア圏外での端末機の受信周波数走査による
消費電力を低減できる移動体通信システムの受信周波数
走査方法を提供することを目的とする。The present invention has been made in view of the above points,
An object of the present invention is to provide a reception frequency scanning method for a mobile communication system, which can reduce power consumption due to reception frequency scanning of a terminal outside the service area.
【０００９】[0009]
【課題を解決するための手段】請求項１に記載の発明
は、セルラー方式の移動体通信システムで、サービスエ
リアの圏外にある端末機が通信可能なセルを探す受信周
波数走査方法において、上記サービスエリアの全セルの
下り信号周波数を走査する全チャネル走査と、最新の通
信を行ったセル及びそのセルの周辺セルの下り信号周波
数を走査する周辺チャネル走査とを所定時間間隔で交互
に繰り返す。According to a first aspect of the present invention, there is provided a mobile communication system of a cellular system, wherein in a reception frequency scanning method for searching a cell with which a terminal outside a service area can communicate, the service is provided. All-channel scanning for scanning the downlink signal frequencies of all cells in the area and peripheral channel scanning for scanning the downlink signal frequencies of the cell that has performed the latest communication and the peripheral cells of the cell are alternately repeated at predetermined time intervals.
【００１０】請求項２に記載の発明は、請求項１記載の
移動体通信システムの受信周波数走査方法において、走
査により受信された下り信号の受信レベルが通信可能と
される基準レベル未満で、かつ、上記基準レベルより低
い受信可能感度以上であるとき、走査の間隔を短縮す
る。According to a second aspect of the present invention, in the reception frequency scanning method for the mobile communication system according to the first aspect, the reception level of the downlink signal received by scanning is less than the reference level at which communication is possible, and , When the receivable sensitivity is lower than the reference level, the scanning interval is shortened.
【００１１】請求項３に記載の発明は、請求項２記載の
移動体通信システムの受信周波数走査方法において、走
査により受信された下り信号の受信レベル前記基準レベ
ル未満で、かつ受信可能感度以上の状態で所定回数を超
える走査を行ったとき、上記下り信号の周波数を走査対
象から外す。According to a third aspect of the present invention, in the reception frequency scanning method of the mobile communication system according to the second aspect, the reception level of the downlink signal received by scanning is less than the reference level and is equal to or higher than the receivable sensitivity. When scanning is performed more than a predetermined number of times in this state, the frequency of the downlink signal is excluded from the scan target.
【００１２】[0012]
【作用】請求項１に記載の発明においては、サービスエ
リア圏外で、常に全チャネル走査を行うのではなく、全
チャネル走査より走査する周波数の数が大幅に少なく、
かつ、通信可能なセルを見付ける可能性の高い周辺チャ
ネル走査と、全チャネル走査とを交互に行うため、受信
周波数走査を行っている時間が短縮され、端末機の消費
電力を低減できる。According to the first aspect of the present invention, the number of frequencies to be scanned is significantly smaller than the scanning of all channels, instead of always scanning all channels outside the service area.
In addition, since the peripheral channel scanning, which has a high possibility of finding a communicable cell, and the all-channel scanning are alternately performed, the time for performing the reception frequency scanning is shortened, and the power consumption of the terminal can be reduced.
【００１３】請求項２に記載の発明においては、受信レ
ベルが受信可能感度以上のものがあるとき走査の間隔を
短縮するため、受信レベルの上昇があり、この受信レベ
ルが基準レベルを超えるような場合に、これを迅速に検
出できる。請求項３に記載の発明においては、受信レベ
ルが受信可能感度以上であるが基準レベルに満たない状
態での走査が継続したとき、その下り信号周波数を走査
対象から外すため、いたずらに走査を繰り返して消費電
力が増加することを防止できる。According to the second aspect of the invention, when the reception level is higher than the receivable sensitivity, the scanning interval is shortened, so that the reception level rises, and the reception level exceeds the reference level. In some cases this can be detected quickly. In the invention according to claim 3, when the scanning is continued in a state where the reception level is equal to or higher than the receivable sensitivity but does not reach the reference level, the downlink signal frequency is excluded from the scanning target, and therefore the scanning is repeatedly performed unnecessarily. Power consumption can be prevented from increasing.
【００１４】[0014]
【実施例】図２は本発明が適用されるセルラー方式の構
成図を示す。同図中、サービスエリア２０は、中心に基
地局（２２1 〜２２n ）を配置した複数のセル２２1 〜
２２n から構成されている。各基地局２２1 〜２２n は
端末機に対して異なる周波数ｆ1 〜ｆn の下り信号を送
出している。2 is a block diagram of a cellular system to which the present invention is applied. In the figure, the service area 20, a plurality of cells 22 1 to which the base station (22 1 through 22 n) arranged in the center
22 n . Each of the base stations 22 1 to 22 n sends downlink signals of different frequencies f 1 to f n to the terminals.
【００１５】図１は端末機２３がサービスエリア２０の
圏外に出たとき行う圏内圏外判定処理のフローチャート
を示す。同図中、ステップＳ３０では、全チャネルの受
信か一部チャネルの受信かを指示する受信判定フラグに
０（全チャネル受信）をセットし、受信回数をカウント
する受信カウンタに１０をセットし、待機時間を計時す
るタイマ値に２秒をセットし、近接エリアか遠方エリア
かを指示する状況フラグに０（近接エリア）をセットし
て初期設定を行う。FIG. 1 shows a flow chart of the out-of-service area determination processing performed when the terminal 23 goes out of the service area 20. In the figure, in step S30, 0 (all channel reception) is set in the reception determination flag that indicates reception of all channels or reception of some channels, 10 is set in the reception counter that counts the number of receptions, and the standby state is set. Initialization is performed by setting a timer value for measuring time to 2 seconds and setting a status flag indicating a near area or a distant area to 0 (near area).
【００１６】次にステップＳ３２で受信部の電源をオン
とし、ステップＳ３４で受信判定フラグが１か否かを判
別する。受信フラグが０の場合はステップＳ３６で受信
周波数をｆ1 からｆn まで順に切換えて全ての基地局２
２1 〜２２n 夫々の下り信号の受信周波数走査つまり全
チャネル走査を行い、ステップＳ３８で受信判定フラグ
に１をセットし、次の受信に備える。また、受信フラグ
が１の場合はステップＳ４０で受信可能感度以上のチャ
ネルの周辺チャネルｆｃ1 からｆｃm までの受信周波数
走査、つまり周辺チャネル走査を行い、ステップＳ４２
で受信判定フラグに０をセットし、次の受信に備える。Next, in step S32, the power of the receiving section is turned on, and in step S34 it is determined whether the reception determination flag is 1 or not. If the reception flag is 0, the reception frequency is sequentially switched from f 1 to f n in step S36, and all the base stations 2
The reception frequency scanning of each of the 2 1 to 22 n downlink signals, that is, all-channel scanning is performed, 1 is set to the reception determination flag in step S38, and the next reception is prepared. If the reception flag is 1, in step S40, the reception frequency scanning from the peripheral channels fc 1 to fc m of the channels having the receivable sensitivity or more, that is, the peripheral channel scanning is performed, and step S42 is performed.
The reception determination flag is set to 0 to prepare for the next reception.
【００１７】この後、ステップＳ４４で受信レベルが受
信可能感度以上の下り信号があるか否かを判別する。受
信可能感度とは完全な受信が可能な基準レベルより低い
がかろうじて受信が可能なレベルである。受信周波数走
査したチャネルの受信レベルが全て受信可能感度より低
い場合はステップＳ４６に進み受信カウンタが０を超え
ているか否かを判別する。Thereafter, in step S44, it is determined whether or not there is a downlink signal whose reception level is equal to or higher than the receivable sensitivity. Receivable sensitivity is a level below the reference level at which complete reception is possible but barely possible. When all the reception levels of the channels scanned by the reception frequency are lower than the receivable sensitivity, the process proceeds to step S46, and it is determined whether or not the reception counter exceeds 0.
【００１８】受信カウンタ≦０の場合は受信周波数走査
を１０回繰り返しても受信可能感度を超える下り信号が
受信できないため、ステップＳ４８で端末機２３はサー
ビスエリア２０から離れた遠方エリア３１にあるとして
状況フラグに１をセットし、ステップＳ５０でタイマ値
に１０秒をセットしてステップＳ５２に進む。ステップ
Ｓ４６で受信カウンタ＞０の場合は直接ステップＳ５２
に進む。When the reception counter ≦ 0, the downlink signal exceeding the receivable sensitivity cannot be received even if the reception frequency scanning is repeated 10 times. Therefore, in step S48, the terminal 23 is assumed to be in the remote area 31 apart from the service area 20. The status flag is set to 1, the timer value is set to 10 seconds in step S50, and the process proceeds to step S52. If the reception counter> 0 in step S46, the process directly proceeds to step S52.
Proceed to.
【００１９】ステップＳ５２では受信カウンタを１だけ
減じ、ステップＳ５４で受信可能感度以上のチャネルが
記録されており、かつ受信カウンタが０以下か否か、つ
まり近接エリアで１０回以上受信周波数走査したか否か
を判別する。この条件を満足する場合には近接エリアで
１０回以上受信周波数走査したが基準レベルに満たなか
ったので、ステップＳ４０で行う受信周波数走査の周辺
チャネルの中から受信可能感度以上の受信レベルのチャ
ネルを消去して走査対象から外す。In step S52, the reception counter is decremented by 1, and in step S54, whether or not the channels having the receivable sensitivity or higher are recorded and the reception counter is 0 or less, that is, whether the reception frequency is scanned 10 times or more in the adjacent area. Determine whether or not. If this condition is satisfied, the reception frequency is scanned 10 times or more in the proximity area, but the reference level is not satisfied. Erase and remove from scanning.
【００２０】この後、ステップＳ５８で圏外判定を行
い、ステップＳ６０で受信部の電源をオフとし、ステッ
プＳ６２で既にセットされているタイマ値だけ計時して
待機した後、ステップＳ３２に進む。一方、ステップＳ
４４で受信レベルが受信可能感度以上の下り信号がある
場合にはステップＳ６８に進み、受信判定フラグに０を
セットして次回の受信周波数走査で周辺チャネル走査を
行うことを指示する。更にステップＳ７０で状況フラグ
に０をセットして端末機２３がサービスエリア２０に近
い近接エリア３０にあることを指示する。そしてステッ
プＳ７２で走査の繰り返し周期を短かくするためにタイ
マ値に２秒をセットする。Thereafter, an out-of-service area determination is made in step S58, the power supply of the receiving unit is turned off in step S60, the timer value set in step S62 is counted and the operation is waited, and then the process proceeds to step S32. On the other hand, step S
If there is a downlink signal whose reception level is equal to or higher than the receivable sensitivity at 44, the process proceeds to step S68, and the reception determination flag is set to 0 to instruct to perform peripheral channel scanning in the next reception frequency scanning. Further, in step S70, the status flag is set to 0 to indicate that the terminal 23 is in the proximity area 30 near the service area 20. Then, in step S72, the timer value is set to 2 seconds in order to shorten the scanning repetition period.
【００２１】次にステップＳ７４で受信レベルが基準レ
ベル以上の下り信号が受信されたか否かを判別し、基準
レベル以上の受信がなければステップＳ５２に進み、基
準レベル以上の受信があればステップＳ７６に進む。ス
テップＳ７６では受信カウンタに初期設定と同様に１０
をセットする。Next, in step S74, it is determined whether or not a downlink signal having a reception level higher than the reference level is received. If there is no reception above the reference level, the process proceeds to step S52, and if there is reception above the reference level, step S76. Proceed to. In step S76, the reception counter is set to 10 as in the initial setting.
Set.
【００２２】この後、ステップＳ７８で基準レベル以上
の下り信号の報知の情報を受信し、ステップＳ７８でこ
の報知情報を正常に受信できたか否かを判別し、正常に
受信できない場合はステップＳ５８に進んで圏外判定を
行い、正常に受信できた場合はステップＳ８２でこの基
準レベル以上の下り信号周波数、即ち受信チャネルを記
憶した後、ステップＳ８４で圏内判定を行って処理を終
了する。After that, in step S78, the information of the notification of the downlink signal of the reference level or more is received, and in step S78, it is determined whether or not the notification information is normally received. If the information is not normally received, the process proceeds to step S58. When the out-of-range determination is made and the signal is normally received, the downlink signal frequency equal to or higher than the reference level, that is, the reception channel is stored in step S82, and then the in-range determination is performed in step S84 to end the process.
【００２３】このように、サービスエリア２０の圏外の
遠方エリアにいる場合は従来よりも長い１０秒間隔で、
図３に示す如く全チャネルｆ1 〜ｆn の受信周波数走
査、つまり最大８０チャネルの全チャネル走査と、ステ
ップＳ６６又はＳ８２で記憶された最新の受信チャネル
の周辺チャネルｆｃ1 〜ｆｃm の受信周波数走査、つま
り最大２０チャネルの周辺チャネル走査とを交互に繰り
返すため、受信部の電源オンの時間が従来に比べて大幅
に短縮され、消費電力を低減することができる。As described above, when the user is in a distant area outside the service area 20, at a 10-second interval longer than before,
As shown in FIG. 3, scanning of reception frequencies of all channels f 1 to f n , that is, scanning of all channels up to 80 channels and reception frequencies of peripheral channels fc 1 to fc m of the latest reception channel stored in step S66 or S82. Since the scanning, that is, the scanning of the peripheral channels of up to 20 channels is alternately repeated, the power-on time of the receiving unit is significantly shortened as compared with the conventional case, and the power consumption can be reduced.
【００２４】また、受信レベルが基準レベルに満たなく
とも受信可能感度以上のものがあれば、受信周波数走査
の繰り返し周期を２秒に縮めて迅速なチャネル捕足が可
能となる。更に、受信レベルが基準レベル未満で受信可
能感度以上の状況が１０回以上つまり一定時間以上継続
した場合は、いたずらに消費電力が増加するため、この
チャネルを周辺チャネルの受信周波数走査の対象から外
し、消費電力の増大を防止している。Further, even if the reception level does not reach the reference level, if there is a sensitivity higher than the receivable sensitivity, the repetition cycle of the reception frequency scanning can be shortened to 2 seconds to enable quick channel acquisition. Furthermore, if the reception level is less than the reference level and the reception sensitivity or more continues for 10 times or more, that is, for a certain period of time or more, power consumption increases unnecessarily, so this channel is excluded from the targets of the reception frequency scanning of peripheral channels. , To prevent an increase in power consumption.
【００２５】[0025]
【発明の効果】上述の如く、請求項１に記載の発明によ
れば、サービスエリア圏外で、常に全チャネル走査を行
うのではなく、全チャネル走査より走査する周波数の数
が大幅に少なく、かつ、通信可能なセルを見付ける可能
性の高い周辺チャネル走査と、全チャネル走査とを交互
に行うため、受信周波数走査を行っている時間が短縮さ
れ、端末機の消費電力を低減できる。As described above, according to the first aspect of the present invention, the scanning of all channels is not always performed outside the service area. Since the peripheral channel scanning, which has a high possibility of finding a communicable cell, and the all-channel scanning are alternately performed, the reception frequency scanning time is shortened and the power consumption of the terminal can be reduced.
【００２６】また、請求項２に記載の発明によれば、受
信レベルが受信可能感度以上のものがあるとき走査の間
隔を短縮するため、受信レベルの上昇があり、この受信
レベルが基準レベルを超えるような場合に、これを迅速
に検出できる。また、請求項３に記載の発明によれば、
受信レベルが受信可能感度以上であるが基準レベルに満
たない状態での走査が継続したとき、その下り信号周波
数を走査対象から外すため、いたずらに走査を繰り返し
て消費電力が増加することを防止でき、実用上極めて有
用である。According to the second aspect of the invention, when the reception level is equal to or higher than the receivable sensitivity, the scanning interval is shortened, so that the reception level rises, and this reception level is lower than the reference level. When it exceeds, this can be detected quickly. According to the invention of claim 3,
When scanning continues in a state where the reception level is above the receivable sensitivity but does not reach the reference level, the downlink signal frequency is excluded from the scan target, and it is possible to prevent repeated scans and increase power consumption. , Practically very useful.
【図１】本発明の圏外圏内判定処理のフローチャートで
ある。FIG. 1 is a flowchart of an out-of-service area determination process of the present invention.
【図２】本発明が適用されるセルラー方式の構成図であ
る。FIG. 2 is a block diagram of a cellular system to which the present invention is applied.
【図３】本発明による受信走査を説明するためのタイミ
ングチャートである。FIG. 3 is a timing chart for explaining reception scanning according to the present invention.
【図４】セルラー方式の構成図である。FIG. 4 is a block diagram of a cellular system.
【図５】従来の圏外圏内判定処理のフローチャートであ
る。FIG. 5 is a flowchart of a conventional out-of-service area determination process.
【図６】従来の受信走査を説明するためのタイミングチ
ャートである。FIG. 6 is a timing chart for explaining a conventional reception scan.
２０ サービスエリア ２１1 〜２１n セル ２２1 〜２２n 基地局 ２３ 端末機 ３０ 近接エリア ３１ 遠方エリア20 Service Area 21 1 to 21 n Cell 22 1 to 22 n Base Station 23 Terminal 30 Near Area 31 Far Area
Claims (3)
サービスエリアの圏外にある端末機が通信可能なセルを
探す受信周波数走査方法において、 上記サービスエリアの全セルの下り信号周波数を走査す
る全チャネル走査と、最新の通信を行ったセル及びその
セルの周辺セルの下り信号周波数を走査する周辺チャネ
ル走査とを所定時間間隔で交互に繰り返すことを特徴と
する移動体通信システムの受信周波数走査方法。1. A cellular mobile communication system,
In the reception frequency scanning method for searching for a cell with which a terminal outside the service area can communicate, all channel scanning for scanning the downlink signal frequency of all cells in the service area, and the latest communication cell and its cell A method for scanning a reception frequency of a mobile communication system, characterized by alternately repeating a peripheral channel scan for scanning a downlink signal frequency of a peripheral cell at a predetermined time interval.
信周波数走査方法において、 走査により受信された下り信号の受信レベルが通信可能
とされる基準レベル未満で、かつ、上記基準レベルより
低い受信可能感度以上であるとき、走査の間隔を短縮す
ることを特徴とする移動体通信システムの受信周波数走
査方法。2. The reception frequency scanning method for a mobile communication system according to claim 1, wherein a reception level of a downlink signal received by scanning is lower than a reference level at which communication is possible and lower than the reference level. A method for scanning a reception frequency of a mobile communication system, wherein a scanning interval is shortened when the sensitivity is equal to or higher than a possible sensitivity.
信周波数走査方法において、 走査により受信された下り信号の受信レベル前記基準レ
ベル未満で、かつ受信可能感度以上の状態で所定回数を
超える走査を行ったとき、上記下り信号の周波数を走査
対象から外すことを特徴とする移動体通信システムの受
信周波数走査方法。3. The method for scanning a reception frequency of a mobile communication system according to claim 2, wherein the reception level of the downlink signal received by the scanning is less than the reference level, and scanning is performed more than a predetermined number of times in a state of being at or above the receivable sensitivity. The method for scanning a reception frequency in a mobile communication system, wherein the frequency of the downlink signal is removed from the scan target when
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7136932A JPH08331628A (en) | 1995-06-02 | 1995-06-02 | Reception frequency scanning method for mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7136932A JPH08331628A (en) | 1995-06-02 | 1995-06-02 | Reception frequency scanning method for mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08331628A true JPH08331628A (en) | 1996-12-13 |
Family
ID=15186928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7136932A Withdrawn JPH08331628A (en) | 1995-06-02 | 1995-06-02 | Reception frequency scanning method for mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08331628A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000042788A1 (en) * | 1999-01-14 | 2000-07-20 | Kabushiki Kaisha Toshiba | Mobile communication terminal having base station search function |
| JP2002027524A (en) * | 2000-05-25 | 2002-01-25 | Alcatel | Method of connecting wireless communication terminal to network again, and corresponding terminal |
| US6415157B1 (en) | 1998-08-28 | 2002-07-02 | Nec Corporation | Personal handyphone system (PHS) mobile radio station with efficient resynchronization capability |
| JP2008042476A (en) * | 2006-08-04 | 2008-02-21 | Sony Corp | Radio communication system, radio communication apparatus, radio communication method, and computer program |
| US7620395B2 (en) | 2002-11-19 | 2009-11-17 | Nec Corporation | Cellular network acquisition method and apparatus |
-
1995
- 1995-06-02 JP JP7136932A patent/JPH08331628A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6415157B1 (en) | 1998-08-28 | 2002-07-02 | Nec Corporation | Personal handyphone system (PHS) mobile radio station with efficient resynchronization capability |
| WO2000042788A1 (en) * | 1999-01-14 | 2000-07-20 | Kabushiki Kaisha Toshiba | Mobile communication terminal having base station search function |
| US6393282B1 (en) | 1999-01-14 | 2002-05-21 | Kabushiki Kaisha Toshiba | Mobile radio communication terminal device with base station searching function |
| JP2002027524A (en) * | 2000-05-25 | 2002-01-25 | Alcatel | Method of connecting wireless communication terminal to network again, and corresponding terminal |
| JP4629911B2 (en) * | 2000-05-25 | 2011-02-09 | アルカテル−ルーセント | Method for reconnecting wireless communication terminal to network and corresponding terminal |
| US7620395B2 (en) | 2002-11-19 | 2009-11-17 | Nec Corporation | Cellular network acquisition method and apparatus |
| JP2008042476A (en) * | 2006-08-04 | 2008-02-21 | Sony Corp | Radio communication system, radio communication apparatus, radio communication method, and computer program |
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