JP2992563B2 - Mobile communication system - Google Patents
Mobile communication systemInfo
- Publication number
- JP2992563B2 JP2992563B2 JP33353690A JP33353690A JP2992563B2 JP 2992563 B2 JP2992563 B2 JP 2992563B2 JP 33353690 A JP33353690 A JP 33353690A JP 33353690 A JP33353690 A JP 33353690A JP 2992563 B2 JP2992563 B2 JP 2992563B2
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- JP
- Japan
- Prior art keywords
- base station
- mobile station
- mobile
- station
- reception level
- 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 - Lifetime
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、移動通信方式に係り、特に小ゾーン構成の
隣接する基地局で異なる周波数の制御チャネルを使用す
る移動通信方式において、移動局がチャネル切り換えを
行う移動通信方式に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and particularly to a mobile communication system in which adjacent base stations having a small zone configuration use control channels of different frequencies. The present invention relates to a mobile communication system for switching channels.
小ゾーン構成の移動通信方式の代表的な例として自動
電話方式がある。自動車電話方式においては、移動局が
通信中にゾーンを移行した場合に、移行したゾーンで使
用可能な無線チャネルに切り換えて通信を継続するチャ
ネル切り換え制御を行う。ゾーン移行の検出は通信中の
基地局と移動局間の受信電界レベルと周辺基地局と移動
局間の受信電界レベルを測定し、比較することにより行
う方法が一般的である。A typical example of a mobile communication system having a small zone configuration is an automatic telephone system. In the mobile telephone system, when a mobile station changes zones during communication, the mobile station switches to a wireless channel that can be used in the shifted zone and performs channel switching control to continue communication. The detection of the zone shift is generally performed by measuring and comparing the reception electric field level between the base station and the mobile station during communication and the reception electric field level between the peripheral base station and the mobile station.
時分割多元接続方式（TDMA方式）においては、ゾーン
移行検出の高速化及び基地局の制御装置の負荷の分散を
目的として、移動局が周辺ゾーンの受信電界レベルを測
定する方法が採用されている。In the time division multiple access system (TDMA system), a method is adopted in which a mobile station measures the reception electric field level in a peripheral zone for the purpose of speeding up zone shift detection and dispersing the load on a control device of a base station. .
具体的には、ゾーン移行検出は移動局が通信に使用し
ていない空き時間を利用して行われる。例えば、このゾ
ーン移行検出は共通制御チャネルに代表されるような、
周辺ゾーンで常時送信されている無線チャネルの受信電
界レベルを測定することで実現される。自動車電話方式
では、システム内の無線チャネル及び有線回線の管理は
基地局または制御局で行うが、基地局または、制御局で
切り換え先の回線の割り当てを行うためには、移動局で
測定した周辺基地局の受信電界レベルを基地局に報告す
る必要がある。Specifically, the zone shift detection is performed by using the idle time that the mobile station is not using for communication. For example, this zone shift detection is represented by a common control channel,
This is realized by measuring the reception electric field level of a wireless channel that is constantly transmitted in the peripheral zone. In the mobile phone system, the management of the wireless channel and the wired line in the system is performed by a base station or a control station. However, in order to assign the line to be switched to by the base station or the control station, the peripheral measured by the mobile station is required. It is necessary to report the received electric field level of the base station to the base station.
従来のTDMA方式の移動通信方式では一定の時間毎に通
信チャネルに付随する制御チャネルを用いて全ての受信
レベルの報告が行われる。In the conventional mobile communication system of the TDMA system, all reception levels are reported at regular intervals using a control channel attached to the communication channel.
しかるに、移動局が基地局に受信レベルを報告するた
めの通信チャネルに付随する制御チャネルがかなり低速
であるために、受信レベルの報告にかなりの時間を要
し、さらに受信レベル報告中はその他の制御信号を送出
できないという問題点がある。また、基地局ではサービ
スエリア内で、通信中の全移動局から一定時間毎に測定
結果が報告されるために、トラヒックが集中している場
合には制御部の負荷が大きくなる危険がある等の問題が
ある。However, since the control channel associated with the communication channel for the mobile station to report the reception level to the base station is considerably slow, it takes a considerable amount of time to report the reception level. There is a problem that a control signal cannot be transmitted. In addition, since the base station reports measurement results at regular intervals from all mobile stations in communication within the service area, there is a risk that the load on the control unit may increase when traffic is concentrated. There is a problem.
本発明は上記の点に鑑みなされたもので、移動局が周
辺ゾーンの受信電界レベル測定結果を基地局に報告する
際に、制御チャネルを圧迫することなく基地局の負荷が
少なくてすむTDMA方式の移動通信方式を提供することを
目的とする。The present invention has been made in view of the above points, and when a mobile station reports a received electric field level measurement result of a peripheral zone to a base station, a TDMA scheme that can reduce the load on the base station without compressing the control channel. An object of the present invention is to provide a mobile communication system.
第１図は本発明の原理説明図を示す。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を利用して周辺基地局の受信電界レ
ベルを測定して、基地局にその結果を報告する移動通信
方式において、移動局は周辺基地局の受信電界レベルの
測定結果（ステップ10）が予め記憶してある条件を満足
するか否かの判定を行い（ステップ11）、測定結果が条
件を満たした場合にのみ測定結果を基地局に報告する
（ステップ12）。また、基地局から制御チャネルを用い
て移動局に測定結果を報告する条件を基地局から移動局
に報告する（ステップ13）。また、基地局は各基地局の
通信チャネルの使用率、制御チャネルの使用率及び、基
地局の制御部の稼働率の少なくとも１つの状態に応じて
報告条件を決定して、移動局に報告する（ステップ1
3）。FIG. 1 is a diagram illustrating the principle of the present invention. The service area is covered by multiple base stations, communication is performed between the mobile station and the base station using the time division multiple access method, and reception of peripheral base stations is performed using the time that the mobile station is not using for communication during communication. In the mobile communication system in which the electric field level is measured and the result is reported to the base station, the mobile station determines whether or not the measurement result (step 10) of the received electric field level of the peripheral base station satisfies a pre-stored condition. Is determined (step 11), and the measurement result is reported to the base station only when the measurement result satisfies the condition (step 12). In addition, the base station reports conditions for reporting the measurement result to the mobile station using the control channel from the base station (step 13). Also, the base station determines a reporting condition according to at least one state of the communication channel usage rate of each base station, the control channel usage rate, and the operation rate of the control unit of the base station, and reports to the mobile station. (step 1
3).
本発明は移動局が基地局に対して、周辺ゾーンの受信
レベルを報告する際に、測定した受信レベルが予め設定
された条件を満たしていれば、その測定結果を基地局に
送信する。また、基地局は移動局に対して受信レベルの
測定方法や基地局への受信レベルを報告するための条件
を報告する。この受信レベルを報告するための条件は、
各基地局の通信チャネルの使用率、制御チャネルの使用
率、基地局制御部の稼働率に応じた値を設定する。ま
た、基地局はトラヒックが集中して、各使用率が高い場
合には移動局からの報告頻度を抑えるような値を設定し
て制御を行う。According to the present invention, when the mobile station reports the reception level of the peripheral zone to the base station, if the measured reception level satisfies a preset condition, the measurement result is transmitted to the base station. Further, the base station reports a method of measuring the reception level to the mobile station and a condition for reporting the reception level to the base station. The conditions for reporting this reception level are:
A value corresponding to the communication channel usage rate, control channel usage rate, and operation rate of the base station control unit of each base station is set. Also, when traffic is concentrated and each usage rate is high, the base station performs control by setting a value that suppresses the frequency of reporting from the mobile station.
第２図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。同図において、移動局101は基地局102と通信
中である。また、基地局103〜108は基地局102に隣接し
ており、基地局103〜108にはそれぞれゾーン内で使用す
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。それらの制御チャネルは常に送信している。FIG. 2 is a system configuration diagram in a general car telephone system. In the figure, a mobile station 101 is communicating with a base station 102. The base stations 103 to 108 are adjacent to the base station 102, and each of the base stations 103 to 108 has at least one common control channel used in a zone. These control channels are always transmitting.
第３図は本発明の実施例における移動局の構成を示
す。移動局101は変調回路201、復調回路202、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 a configuration of a mobile station according to the embodiment of the present invention. The mobile station 101 includes a modulation circuit 201, a demodulation circuit 202, a synthesizer 203, a reception level measurement circuit 204, a timing generation circuit
205, an encoding circuit 206, a control circuit 207, and a decoding circuit 208.
受信レベル測定回路204はタイミング発生回路205から
のフレー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はフレー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TDMAフレームに多重化し、更に、無線区
間で伝送するために信号を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、そのうち制御信号は制御回路20
7に送出し、情報信号は基地局102に送出する。The reception level measurement circuit 204 is a circuit that switches the frequency of the frequency synthesizer 203 specified by the control circuit 207 based on the frame timing from the timing generation circuit 205 and measures the reception level. Timing generation circuit
205 is a circuit for generating a frame timing. The encoding circuit 206 is a circuit that multiplexes an information signal from the base station 102 and a control signal from the control circuit 207 into a TDMA frame, and further encodes the signal 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 and separates the received signal into a control signal and an information signal.
7 and the information signal to the base station 102.
次に第３図に示す構成における移動局101の受信レベ
ル測定動作を説明する。移動局101は基地局102から報告
された周辺基地局103〜108のゾーン判定用周波数を制御
回路207から受信レベル測定回路204に報告する受信レベ
ル測定回路204はタイミング発生回路205から指定される
タイミングから通信に使用していないスロットの時間だ
けシンセサイザ203をゾーン判定用周波数に切り換え、
その時間に復調回路202で測定されたレベルを制御回路2
07に報告する。Next, the operation of measuring the reception level of the mobile station 101 in the configuration shown in FIG. 3 will be described. The mobile station 101 reports the zone determination frequency of the peripheral base stations 103 to 108 reported from the base station 102 to the reception level measurement circuit 204 from the control circuit 207.The reception level measurement circuit 204 is a timing designated by the timing generation circuit 205. From the synthesizer 203 to the zone determination frequency for the time of the slot not used for communication,
At that time, the level measured by the demodulation circuit 202 is used as the control circuit 2
Report to 07.
第４図は本発明の実施例における移動局での測定動作
を説明するための図を示す。同図は３チャネルのTDMA方
式において移動局101が周辺ゾーンの受信レベルの測定
のタイミングと移動局101の受信周波数のフレームを示
す。同図中（Ａ）は移動局101の受信信号を示し、同図
（Ｂ）は移動局101の受信周波数のフレームを示す。同
図（Ｂ）のフレームでフレームF1は同図（Ａ）の30a〜3
0f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。フレームF2〜F7は周辺基地局103〜108の共
通制御チャネルの周波数である。FIG. 4 is a diagram for explaining a measurement operation in the mobile station according to the embodiment of the present invention. The figure shows the timing of the measurement of the reception level of the peripheral zone by the mobile station 101 and the frame of the reception frequency of the mobile station 101 in the three-channel TDMA system. 2A shows a received signal of the mobile station 101, and FIG. 2B shows a frame of the received frequency of the mobile station 101. The frame F1 is the frame shown in FIG.
This is the frequency of the wireless channel used for communication at the timing of 0f. Frames F2 to F7 are frequencies of the common control channel of the peripheral base stations 103 to 108.
基地局102は移動局101が通信を開始したときに、周辺
基地局103〜108を使用している共通制御チャネルの周波
数の中から夫々１つずつ周波数フレームF2〜F7を移動局
101に報告する。移動局101は通信に使用していないスロ
ットの時間に周辺基地局103〜108から報告された周波数
にシンセサイザ203により切り換えて、同図（Ａ）の31a
〜31fのタイミングで周辺ゾーンからの周波数フレームF
2〜F7を受信し、順次周辺基地局103〜108の受信電界レ
ベルを測定する。When the mobile station 101 starts communication, the base station 102 transmits the frequency frames F2 to F7 one by one from the frequencies of the common control channels using the peripheral base stations 103 to 108, respectively.
Report to 101. The mobile station 101 switches to the frequency reported from the peripheral base stations 103 to 108 by the synthesizer 203 at the time of the slot not used for communication by the synthesizer 203, and 31a in FIG.
Frequency frame F from the surrounding zone at the timing of ~ 31f
2 to F7 are received, and the reception electric field levels of the peripheral base stations 103 to 108 are sequentially measured.
次に各実施例について説明する。 Next, each embodiment will be described.
第１実施例 移動局101が基地局102に受信レベルを報告する場合
に、報告するための条件を設け、その条件を満たすもの
だけが基地局102に送信できるようにしたものである。First Embodiment When the mobile station 101 reports a reception level to the base station 102, a condition for reporting is provided, and only those that satisfy the condition can be transmitted to the base station 102.
受信レベルを基地局102に報告するための条件とし
て、受信レベルが予め定められた閾値以上のレベルのも
のだけを報告する例を説明する。移動局101は周辺基地
局103〜108の受信電界レベルを第４図（Ａ）のタイミン
グで順次フレームF2,F3,F4,F5,F6,F7を測定する。移動
局101はその結果に基づき、所定の閾値以上の受信レベ
ルを選出して、基地局102へ報告する制御を行う。As an example of a condition for reporting the reception level to the base station 102, an example will be described in which only the reception level having a level equal to or higher than a predetermined threshold is reported. The mobile station 101 measures the reception electric field levels of the peripheral base stations 103 to 108 in the order of frames F2, F3, F4, F5, F6, and F7 at the timing shown in FIG. The mobile station 101 selects a reception level equal to or higher than a predetermined threshold based on the result, and performs control to report the reception level to the base station 102.
第５図は本発明の第１実施例の受信レベルを示す。同
図中、レベル501〜506は移動局101が測定した周辺基地
局103〜108の受信電界レベルを示す。また、破線507は
移動局101が測定した受信レベルを基地局102へ報告する
か否かを判定するための閾値を示しており、この例では
受信レベルが閾値507以上のものを報告する。同図に示
す例は、測定した受信レベル501〜506のうち閾値507以
上のもの、即ちレベル502とレベル503だけが基地局102
に報告されるため、全ての受信レベル測定結果501〜506
を報告する制御に比べて信号長を短くできる。FIG. 5 shows the reception level of the first embodiment of the present invention. In the figure, levels 501 to 506 indicate the reception electric field levels of the peripheral base stations 103 to 108 measured by the mobile station 101. A broken line 507 indicates a threshold for determining whether or not to report the reception level measured by the mobile station 101 to the base station 102. In this example, a reception level of which is higher than the threshold 507 is reported. In the example shown in the figure, the measured reception levels 501 to 506 that are equal to or higher than the threshold 507, that is, only the levels 502 and 503 are the base stations 102
, All the reception level measurement results 501 to 506
Signal length can be shortened as compared with the control for reporting the signal length.
この方法により受信電界レベルが低く、チャネル切り
換え先の候補としては適さないゾーンの受信レベルの報
告を防止することが可能となるため制御チャネルの圧迫
を緩和できる。According to this method, the reception electric field level is low, and it is possible to prevent the report of the reception level of a zone that is not suitable as a channel switching destination candidate.
第２実施例 第１実施例では移動局101が予め設定された閾値以上
のレベルのものだけを報告する例を示したが、本実施例
では閾値の代わりに差分を算出することにより制御を行
う。周辺の基地局103〜108の受信電界レベルと通信中の
基地局102の受信電界レベルとの差が予め定められた値
以上のものだけを基地局102に報告する。Second Embodiment In the first embodiment, an example has been shown in which the mobile station 101 reports only a level higher than a preset threshold, but in the present embodiment, control is performed by calculating a difference instead of the threshold. . Only those having a difference between the received electric field levels of the neighboring base stations 103 to 108 and the received electric field level of the base station 102 in communication with the base station 102 are reported to the base station 102.
すなわち、移動局101は通信中の基地局102の受信電界
レベルと第４図（Ａ）の31a〜31fのタイミングで順次、
各フレームF2,F3,F4,F5,F6,F7の周辺基地局103〜108の
受信電界レベルを測定する。測定した通信中の基地局10
2の受信電界レベルと、周辺基地局103〜108の受信電界
レベルとの差を例えば、周辺基地局103の受信レベルの
場合には 差分＝（周辺基地局103の受信レベル） −（通信中の基地局102の受信レベル） によって求める。この結果から差分が予め設定されてい
る所定値以上のものを選出して、基地局102に報告する
制御を行う。That is, the mobile station 101 sequentially receives the reception electric field level of the base station 102 during communication and the timing of 31a to 31f in FIG.
The reception electric field levels of the peripheral base stations 103 to 108 of the frames F2, F3, F4, F5, F6, and F7 are measured. Base station 10 in communication measured
For example, in the case of the reception level of the peripheral base station 103, the difference between the reception electric field level of No. 2 and the reception electric field levels of the peripheral base stations 103 to 108 is: (Reception level of the base station 102). From this result, a control is performed to select a difference whose difference is equal to or greater than a predetermined value and report the difference to the base station 102.
従来の方式では通信中の基地局102でこの差分を計算
して、切り換え先の判断を行っているが、この機能を移
動局101に備えることにより基地局102の負荷の分散及
び、切り換え先の候補を移動局102で選定するため無線
区間の制御信号の量も減少できる。In the conventional method, this difference is calculated by the communicating base station 102 to determine the switching destination. However, by providing this function in the mobile station 101, the load of the base station 102 can be dispersed and the switching destination can be determined. Since candidates are selected by the mobile station 102, the amount of control signals in the radio section can also be reduced.
第３実施例 本実施例では移動局101から基地局102に受信レベルを
報告する条件として、移動局101が前回基地局102に報告
した報告データを記憶手段に記憶しておき、第１実施例
及び第２実施例と同様の方法で測定した受信レベルと前
回の報告データとの変化量を求める。その変化量が予め
設定されている閾値以上の場合だけ、基地局102に報告
する。Third Embodiment In this embodiment, as a condition for reporting the reception level from the mobile station 101 to the base station 102, report data previously reported by the mobile station 101 to the base station 102 is stored in the storage means, and the first embodiment Then, the amount of change between the reception level measured in the same manner as in the second embodiment and the previous report data is obtained. Only when the amount of change is equal to or greater than a preset threshold value, is reported to base station 102.
すなわち、移動局101は周辺基地局103〜108の受信電
界レベルを順次測定し、前回基地局102に報告した受信
レベルデータと今回報告しようとする受信レベルデータ
を比較して、全ての周辺基地局103〜108の受信レベルデ
ータの変化量が閾値以下の場合には基地局102へ報告し
ないように制御する。一方、変化量が閾値以上になった
場合には移動局101は基地局102にその受信レベルを報告
する。That is, the mobile station 101 sequentially measures the reception electric field levels of the peripheral base stations 103 to 108, compares the reception level data previously reported to the base station 102 with the reception level data to be reported this time, If the amount of change in the reception level data of 103 to 108 is equal to or smaller than the threshold, control is performed so as not to report to the base station 102. On the other hand, when the amount of change becomes equal to or larger than the threshold, the mobile station 101 reports the reception level to the base station 102.
これにより、フェージングの周期に比べて低速で移動
している移動局の受信電界レベルは１回の測定の間での
変化量は小さくなるが、このような制御を行うことによ
り前回の報告に対して殆ど変化していないような場合に
基地局102に受信レベルの報告を行うことを抑制するこ
とが可能となるため、基地局102の負荷の軽減及び無線
区間の制御情報減少の効果がある。As a result, the amount of change in the received electric field level of the mobile station moving at a lower speed than the fading cycle during one measurement becomes smaller. Since it is possible to suppress reporting of the reception level to the base station 102 when there is almost no change, there is an effect of reducing the load on the base station 102 and reducing the control information in the radio section.
上記第１実施例から第３実施例の制御を行う場合に報
告の条件を基地局102から設定するようにすれば、基地
局毎に基地局の設置条件にあった値を設定することがで
きる。If the conditions of the report are set from the base station 102 when the control of the first to third embodiments is performed, it is possible to set a value suitable for the installation condition of the base station for each base station. .
即ち、恒常的にトラヒックの集中するエリアの基地局
では、報告頻度を抑制するような値を設定し、逆に、ト
ラヒックがあまり集中しないエリアの基地局では頻繁に
受信レベルの報告が発生するような値を設定し、これを
報告条件とすることが可能である。That is, in the base station in the area where traffic is constantly concentrated, a value that suppresses the report frequency is set, and conversely, in the base station in the area where traffic is not so concentrated, the reception level is frequently reported. It is possible to set an appropriate value and use this as a report condition.
さらに、通信チャネルの使用率、制御チャネルの使用
率、制御チャネルの使用率及び基地局制御部の稼働率等
から基地局のトラヒック状況を把握できるようなシステ
ム構成においては、そのトラヒック状況を把握できるよ
うなシステム構成においてはそのトラヒックの集中の度
合いより、基地局への報告条件を変更する制御も可能で
ある。この例を以下に示す。Further, in a system configuration in which the traffic situation of the base station can be grasped from the communication channel utilization rate, the control channel utilization rate, the control channel utilization rate, the operation rate of the base station control unit, and the like, the traffic situation can be grasped. In such a system configuration, it is also possible to control to change the report condition to the base station based on the degree of traffic concentration. This example is shown below.
第４実施例 第１実施例の制御を行う場合に閾値を基地局102から
制御チャネルを用いて移動局101に指定する例を示す。
基地局102の無線ゾーンに在圏する移動局の数が増加
し、基地局102の処理能力が低下しているときには、閾
値を高く設定することにより、在圏している移動局の報
告頻度を下げて受信レベル報告に関する負荷を軽減す
る。Fourth Embodiment An example in which a threshold is specified from the base station 102 to the mobile station 101 using the control channel when performing the control of the first embodiment will be described.
When the number of mobile stations located in the wireless zone of the base station 102 is increasing and the processing capability of the base station 102 is decreasing, the reporting frequency of the located mobile stations is set by setting a high threshold. To reduce the load on reception level reporting.
逆に基地局102の処理能力に余裕のあるときは、閾値
を低く設定することにより、移動局に頻繁に受信レベル
の報告をさせ、基地局102で常に最新のデータを備え、
急激な干渉等のために移動局からの制御信号が基地局10
2で受信しにくくなった場合にも前回のデータから移動
局の移動先ゾーン判定を行うことができる。Conversely, when there is room in the processing capacity of the base station 102, by setting the threshold low, the mobile station frequently reports the reception level, the base station 102 always has the latest data,
The control signal from the mobile station is transmitted to the base station 10 due to sudden interference, etc.
If the reception becomes difficult in step 2, the destination zone of the mobile station can be determined from the previous data.
第５実施例 第２実施例の制御を行う場合に受信レベル差分の判定
値を基地局102から制御チャネルを用いて指定する例を
示す。一般にザービスゾーンの境界付近は隣接する基地
局のどちらとでも電話を送受信できるようにゾーンをオ
ーバーラップするように設計している。このため、移動
局101での周辺基地局103〜108の受信レベルが通信中の
基地局102の受信レベルより大きくなるエリアが存在す
る。Fifth Embodiment An example in which a determination value of a reception level difference is designated from the base station 102 using a control channel when performing the control of the second embodiment will be described. In general, the vicinity of the service zone boundary is designed to overlap the zones so that telephone calls can be made to and from any of the adjacent base stations. For this reason, there are areas where the reception level of the peripheral base stations 103 to 108 at the mobile station 101 is higher than the reception level of the base station 102 during communication.
このようなシステムはレベル差分の判定値を操作する
ことによりオーバーラップエリアの大きさを操作でき
る。即ち、受信レベルの差分の判定値を小さくすればオ
ーバーラップエリアが小さくなる。従って、特定のエリ
アにトラヒックが集中した場合にゾーン境界付近の移動
局を周辺基地局へチャネル切り換えによって分散させる
効果がある。逆に受信レベル差分の判定値を大きくする
と、移動局はゾーン移行判定が遅くなるため周辺基地局
へのチャネル切り換えを抑制することができる。In such a system, the size of the overlap area can be operated by manipulating the judgment value of the level difference. That is, the smaller the determination value of the difference between the reception levels, the smaller the overlap area. Therefore, when traffic is concentrated in a specific area, there is an effect that mobile stations near the zone boundary are dispersed to neighboring base stations by channel switching. Conversely, when the determination value of the reception level difference is increased, the mobile station delays the zone shift determination, so that it is possible to suppress channel switching to a neighboring base station.
第６実施例 第３実施例の制御を行う場合に、変化量の閾値を基地
局102から制御チャネルを用いて移動局に指定する例を
示す。基地局102配下の移動局の数が増えて、基地局102
の処理能力が低下している時には基地局102は閾値を大
きく設定することにより、移動局101の報告頻度を下げ
て受信レベルの報告に関する基地局102の負荷を軽減す
る効果がある。逆に基地局102の処理能力に余裕がある
時は、基地局102は変化量の閾値を小さく設定すること
により、移動局101に対して頻繁にレベル報告をさせ、
基地局102では常に最新のデータを備え、急激な干渉等
のために移動局101からの制御信号が基地局102で受信し
にくくなった場合にも前回の受信レベルのデータから移
動局101の移行先のゾーン判定を行うことが可能にな
る。Sixth Embodiment In the case of performing the control of the third embodiment, an example is shown in which the threshold value of the amount of change is specified from the base station 102 to the mobile station using the control channel. As the number of mobile stations under the base station 102 increases, the base station 102
When the processing capacity of the base station 102 is decreasing, the base station 102 sets the threshold value to a large value, which has the effect of reducing the reporting frequency of the mobile station 101 and reducing the load on the base station 102 for reporting the reception level. Conversely, when there is room in the processing capacity of the base station 102, the base station 102 sets the threshold of the amount of change to a small value, so that the mobile station 101 frequently reports the level,
The base station 102 always has the latest data, and even when a control signal from the mobile station 101 becomes difficult to be received by the base station 102 due to sudden interference or the like, the mobile station 101 shifts from the previous reception level data. It is possible to perform the preceding zone determination.
上記の第１実施例から第６実施例では予め定められた
条件を満足するものを全て基地局102に報告する例につ
いて説明したが、実際のシステムでは、基地局の処理能
力や、制御の遅延を考慮した場合、チャネル切り換え先
の候補として扱い、基地局数を限定するのが現実的であ
る。そこで、移動局101から基地局102へ報告する周辺基
地局の受信レベル測定結果の最大数を予め決めておき、
制御情報信号の信号長を短くする方法も効果的である。In the above-described first to sixth embodiments, an example has been described in which all information that satisfies a predetermined condition is reported to the base station 102. However, in an actual system, the processing capability of the base station and the control delay are described. In consideration of the above, it is practical to treat as a channel switching destination candidate and limit the number of base stations. Therefore, the maximum number of reception level measurement results of peripheral base stations to be reported from the mobile station 101 to the base station 102 is determined in advance,
A method of shortening the signal length of the control information signal is also effective.
また、基地局102は移動局101が受信レベルを報告する
周期を指定する。このとき、基地局102の処理負荷の度
合いに従って、処理負荷が大きい場合には報告周期を長
くして、移動局101は基地局102に報告する頻度を抑え
る。一方、処理負荷が小さい場合には基地局102は報告
周期を短くして、基地局102に報告する頻度を上げる方
法も効果的である。Also, the base station 102 specifies a cycle at which the mobile station 101 reports the reception level. At this time, if the processing load is large according to the degree of the processing load of the base station 102, the reporting cycle is lengthened, and the mobile station 101 suppresses the frequency of reporting to the base station 102. On the other hand, when the processing load is small, a method of shortening the reporting cycle of the base station 102 and increasing the frequency of reporting to the base station 102 is also effective.
上記の実施例はそれぞれ、個別の制御を説明している
が、これらを組み合わせて使用すると一層効果的であ
る。この組み合わせた例を第７実施例で説明する。Although each of the above embodiments describes individual controls, it is more effective to use them in combination. An example of this combination will be described in a seventh embodiment.
第７実施例 基地局102は移動局101に対して、通信開始時に測定す
る周波数と、さらに基地局102からの報告の条件として
第２実施例に示したレベル差分の閾値、第３実施例に示
したレベル変化量の閾値、報告最大数、及び報告周期と
して、長い周期と短い周期を指定する。Seventh Embodiment The base station 102 provides the mobile station 101 with a frequency measured at the start of communication and a threshold value of the level difference shown in the second embodiment as a condition for reporting from the base station 102. A long cycle and a short cycle are designated as the indicated level change threshold value, maximum report number, and report cycle.
第６図は本発明の第７実施例の移動局101の処理を説
明するための図を示す。同図中、αはレベル差分の閾
値、T1は短い報告周期、T2は長い報告周期、BLは周辺基
地局の受信レベルと通信中の基地局102の受信レベルの
差を示す。FIG. 6 is a diagram for explaining processing of the mobile station 101 according to the seventh embodiment of the present invention. In the figure, α is a threshold value of the level difference, T1 is a short report cycle, T2 is a long report cycle, and BL is a difference between the reception level of the peripheral base station and the reception level of the base station 102 during communication.
次に同図を用いて移動局101の動作を説明する。先
ず、基地局102は移動局101に受信レベル報告条件を指定
する（ステップ61）。次に基地局102は長い報告周期を
移動局101に指定する（ステップ62）。移動局101は周辺
の基地局103〜108の受信レベルを測定して、それぞれの
周辺基地局103〜108の受信レベルと通信中の基地局102
の受信レベルの差BLを計算する（ステップ63）。移動局
101は受信レベルの差BLがレベル差分の閾値αを越えて
いるかを判断する（ステップ64）。受信レベルの差BLが
αを越えていない間は長い報告周期T2をタイムアップさ
せ（ステップ65）、基地局102に受信レベル報告を行う
（ステップ66）。Next, the operation of the mobile station 101 will be described with reference to FIG. First, the base station 102 specifies a reception level report condition to the mobile station 101 (step 61). Next, the base station 102 specifies a long reporting cycle to the mobile station 101 (step 62). The mobile station 101 measures the reception levels of the peripheral base stations 103 to 108, and compares the reception levels of the peripheral base stations 103 to 108 with the base station 102 that is communicating.
Is calculated (step 63). Mobile station
101 determines whether or not the difference BL between the reception levels exceeds the threshold value α of the level difference (step 64). As long as the reception level difference BL does not exceed α, the long reporting cycle T2 is timed up (step 65), and the reception level is reported to the base station 102 (step 66).
一方、受信レベルの差BLがαを越えている場合には、
報告周期T2を切り（ステップ67）、基地局102に受信レ
ベル報告を行う（ステップ68）。次に短い報告周期T1に
切り換えて、（ステップ69）ステップ63と同様の受信レ
ベルの測定を行う（ステップ70）。報告周期T1をタイム
アップし（ステップ71）、T1の報告周期で受信レベルの
差BLがレベル差分の閾値αを越えているかを判断する
（ステップ72）。BLが閾値αを越えていない場合にはス
テップ62へ移行し、BLが閾値αを越えている場合には受
信レベルの変化量と変化量閾値βと比較して（ステップ
73）変化量がβを越えて入れば、基地局102に受信レベ
ルの報告を行う。また、変化量がβを越えていない場合
にはステップ69に移行する。On the other hand, if the reception level difference BL exceeds α,
The reporting cycle T2 is cut off (step 67), and a reception level report is made to the base station 102 (step 68). Next, switching to the short reporting cycle T1 (step 69), the same reception level measurement as in step 63 is performed (step 70). The reporting cycle T1 is timed up (step 71), and it is determined whether or not the reception level difference BL exceeds the level difference threshold α in the reporting cycle of T1 (step 72). If BL does not exceed the threshold value α, the process proceeds to step 62, and if BL exceeds the threshold value α, the change amount of the reception level is compared with the change amount threshold value β (step
73) If the variation exceeds β, report the reception level to the base station 102. If the amount of change does not exceed β, the process proceeds to step 69.
以上のような制御を行うことにより、切り換え先の候
補がある場合には基地局102に頻繁に受信レベルの報告
を行ない、また、候補がない場合には報告頻度を抑える
制御が可能になる。さらにトラヒックの状況に応じて受
信レベル差分の閾値、受信レベルの変化量の閾値β及
び、報告周期を設定することにより、基地局102の処理
能力及び通信チャネル、制御チャネルの使用率に見合っ
た制御が可能になる。By performing the control as described above, it is possible to perform a report of the reception level to the base station 102 frequently when there is a candidate for the switching destination, and to control the reporting frequency when there is no candidate. Furthermore, by setting the threshold of the reception level difference, the threshold β of the amount of change in the reception level, and the reporting cycle according to the traffic situation, the control corresponding to the processing capacity of the base station 102 and the usage rate of the communication channel and control channel Becomes possible.
本発明によれば、移動局がゾーン判定のために周辺基
地局の受信電界レベルを基地局に報告する際に、移動局
の報告頻度及び制御信号量のを減少して制御チャネルの
圧迫を防止することが可能となる。また、基地局の負担
を軽減することが可能となる。さらに、受信レベルの報
告条件を基地局から移動局に指定し、基地局のトラヒッ
ク状況に応じて報告条件を設定することにより特定のゾ
ーンにトラヒックが集中することを防止することが可能
になる。According to the present invention, when the mobile station reports the received electric field level of the peripheral base station to the base station for zone determination, the report frequency of the mobile station and the amount of control signals are reduced to prevent control channel compression. It is possible to do. In addition, the burden on the base station can be reduced. Further, by designating the report condition of the reception level from the base station to the mobile station and setting the report condition according to the traffic condition of the base station, it is possible to prevent traffic from being concentrated in a specific zone.
第１図は本発明の原理説明図、 第２図は一般的な自動車電話方式におけるシステム構成
図、 第３図は本発明における移動局の構成図、 第４図は本発明の実施例における移動局での測定動作を
説明するための図、 第５図は本発明の第１実施例の受信レベルを示す図、 第６図は本発明の第７実施例の移動局の処理を説明する
ための図である。 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。FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a system configuration diagram in a general car telephone system, FIG. 3 is a configuration diagram of a mobile station in the present invention, and FIG. 4 is mobile in an embodiment of the present invention. FIG. 5 is a diagram for explaining the measurement operation in the station, FIG. 5 is a diagram showing the reception level of the first embodiment of the present invention, and FIG. 6 is a diagram for explaining the processing of the mobile station of the seventh embodiment of the present invention. FIG. 101 mobile station, 102 to 108 base station, 201 modulation circuit, 202 demodulation circuit, 203 synthesizer, 204
Received level measurement circuit, 205 timing generation circuit, 206
... An encoding circuit, 207 a control circuit, 208 a decoding circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安田 周二 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 (72)発明者 小林 勝美 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 (56)参考文献 特開 昭59−161138（ＪＰ，Ａ) 特開 平２−249325（ＪＰ，Ａ) 特開 昭58−187033（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 7/24 - 7/26 H04Q 7/00 - 7/38 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shuji Yasuda 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Katsumi Kobayashi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan (56) References JP-A-59-161138 (JP, A) JP-A-2-249325 (JP, A) JP-A-58-187033 (JP, A) (58) Fields investigated ( Int.Cl. 6 , DB name) H04B 7/24-7/26 H04Q 7/00-7/38
Claims (3)
接する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を利用して
周辺基地局の受信電界レベルを測定して、基地局にその
結果を報告する移動通信方式において、 前記移動局は前記周辺基地局の受信電界レベルの測定結
果が、予め記憶してある条件を満足するか否かの判定を
行い、 該測定結果が該条件を満たした場合にのみ該測定結果を
前記基地局に報告することを特徴とする移動通信方式。1. A service area is covered by a plurality of adjacent base stations using control channels of different frequencies, and communication between a mobile station and a base station is performed by a time division multiple access system.
In a mobile communication system in which a mobile station measures a reception electric field level of a peripheral base station using a time not used for communication during communication and reports the result to a base station, the mobile station is configured to be a peripheral base station. It is determined whether or not the measurement result of the received electric field level satisfies a condition stored in advance, and that the measurement result is reported to the base station only when the measurement result satisfies the condition. Characteristic mobile communication system.
告する前記条件を前記基地局から制御チャネルを用いて
前記移動局に指定することを特徴とする請求項１記載の
移動通信方式。2. The mobile communication system according to claim 1, wherein said condition for reporting a measurement result from said base station to said mobile station is specified from said base station to said mobile station using a control channel.
ャネルの使用率及び、基地局の制御部の稼動率の少なく
とも１つの状態に応じて前記報告条件を決定することを
特徴とする請求項２記載の移動通信方式。3. The reporting condition is determined according to at least one of a communication channel usage rate, a control channel usage rate, and an operation rate of a control unit of the base station. Item 3. The mobile communication system according to Item 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33353690A JP2992563B2 (en) | 1990-11-29 | 1990-11-29 | Mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33353690A JP2992563B2 (en) | 1990-11-29 | 1990-11-29 | Mobile communication system |
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| Publication Number | Publication Date |
|---|---|
| JPH04200032A JPH04200032A (en) | 1992-07-21 |
| JP2992563B2 true JP2992563B2 (en) | 1999-12-20 |
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|---|---|---|---|
| JP33353690A Expired - Lifetime JP2992563B2 (en) | 1990-11-29 | 1990-11-29 | Mobile communication system |
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| JP4861487B2 (en) * | 2010-02-15 | 2012-01-25 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile station, radio base station, and communication control method |
| JP5553107B2 (en) | 2010-03-12 | 2014-07-16 | 富士通株式会社 | RELAY DEVICE, RELAY DEVICE CONTROL METHOD, AND RADIO COMMUNICATION SYSTEM |
| KR101995693B1 (en) | 2014-08-07 | 2019-10-01 | 닛본 덴끼 가부시끼가이샤 | Base station, wireless communication system, and communication method |
| JP6561459B2 (en) * | 2014-12-16 | 2019-08-21 | 富士通株式会社 | Area determination device, area determination method, and area determination program |
| WO2016152805A1 (en) | 2015-03-23 | 2016-09-29 | 日本電気株式会社 | Communication terminal, communication system, communication method, and communication program |
| JP6498239B2 (en) * | 2017-06-30 | 2019-04-10 | ソフトバンク株式会社 | Base station, mobile communication system, and handover control method |
-
1990
- 1990-11-29 JP JP33353690A patent/JP2992563B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04200032A (en) | 1992-07-21 |
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