JPH04200032A - Mobile communication system - Google Patents
Mobile communication systemInfo
- Publication number
- JPH04200032A JPH04200032A JP33353690A JP33353690A JPH04200032A JP H04200032 A JPH04200032 A JP H04200032A JP 33353690 A JP33353690 A JP 33353690A JP 33353690 A JP33353690 A JP 33353690A JP H04200032 A JPH04200032 A JP H04200032A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- mobile station
- station
- mobile
- reporting
- 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.)
- Granted
Links
- 238000010295 mobile communication Methods 0.000 title claims description 11
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 230000005684 electric field Effects 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 11
- 230000007704 transition Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- Mobile Radio Communication Systems (AREA)
Abstract
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移動
通信方式において、移動局かチャネル切り換えを行う移
動通信方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile communication system, and particularly to a mobile communication system with a small zone configuration in which a mobile station performs channel switching.
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
方法か一般的である。An automatic telephone system is a typical example of a mobile communication system with a small zone configuration. In the car telephone system, when a mobile station changes zones during communication, channel switching control is performed to switch to a radio channel that can be used in the zone to which the mobile station has moved and continue communication. Zone transition is generally detected by measuring and comparing the received electric field level between a communicating base station and a mobile station and the received electric field level between a neighboring base station and a 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
測定する方法か採用されている。In the time division multiple access method (TDMA method), a method is adopted in which a mobile station measures the received electric field level in the surrounding zone in order to speed up zone transition detection and distribute the load on the base station control device. .
具体的には、ゾーン移行検出は移動局か通信に使用して
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、制御局て切
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
必要かある。Specifically, zone transition detection is performed using free time that is not used for communication by the mobile station. For example, this zone transition detection is realized by measuring the received electric field level of a wireless channel that is constantly transmitted in the surrounding zone, such as a common control channel. In the car telephone system, the wireless channels and wired lines within the system are managed by the base station or control station, but in order for the base station or control station to allocate the switching destination line, it is necessary to use the surrounding area measured by the mobile station. Is it 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
信レベルの報告か行われる。In a conventional TDMA mobile communication system, all reception levels are reported at regular intervals using a control channel attached to a communication channel.
しかるに、移動局か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かかなり低速で
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てき
ないという問題点かある。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
か報告されるために、トラピックか集中している場合に
は制御部の負荷か大きくなる危険がある等の問題かある
。However, since the control channel accompanying the communication channel for reporting the reception level to the mobile station or base station is quite slow, it takes a considerable amount of time to report the reception level.
Another problem is that other control signals are not sent while the reception level is being reported. In addition, since the base station reports measurement results from all communicating mobile stations within the service area at regular intervals, there is a risk that the load on the control unit will increase if there is a high concentration of mobile stations. There is a problem with that.
本発明は上記の点に鑑みなされたもので、移動局か周辺
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か少
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 is a TDMA method that reduces the load on the base station without putting pressure on the control channel when reporting the measurement result of the received electric field level of the mobile station or the surrounding zone to the base station. The purpose 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、移動局か通信中に通信に使
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）か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１３）。FIG. 1 shows a diagram explaining the principle of the present invention. A service area is covered by multiple base stations, and communication is performed between the mobile station and the base station using a time division multiple access method, and the mobile station receives information from nearby base stations using the time not used for communication. In a mobile communication system that measures the electric field level and reports the result to the base station, the mobile station determines whether the measurement result of the received electric field level of the surrounding base station (step 10) satisfies a pre-stored condition. (Step 11), and reports the measurement result to the base station only if the measurement result satisfies the conditions (Step 12). Furthermore, the base station reports to the mobile station the conditions for reporting the measurement results to the mobile station using the control channel (step 13). Further, the base station determines reporting conditions according to at least one of the usage rate of the communication channel of each base station, the usage rate of the control channel, and the operating rate of the control unit of the base station, and reports it to the mobile station. (Step 13).
本発明は移動局か基地局に対して、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か予め設定さ
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した値を設定する。また、
基地局はトラヒックか集中して、各使用率か高い場合に
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 reporting the reception level in a surrounding zone to a mobile station or a base station, if the measured reception level satisfies a preset condition, the measurement result is transmitted to the base station. The base station also reports to the mobile station the method for measuring the reception level and the conditions for reporting the reception level to the base station. The conditions for reporting this reception level are set to values corresponding to the usage rate of the communication channel of each base station, the usage rate of the control channel, and the operating rate of the base station control unit. Also,
The base station performs control by concentrating traffic and setting values to reduce the frequency of reports from mobile stations when each usage rate is high.
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１
０２に隣接しており、基地局１０３〜１０８にはそれぞ
れゾーン内て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 of a general car telephone system. In the figure, a mobile station 101 is communicating with a base station 102. In addition, base stations 103 to 108 are base station 1
02, and base stations 103 to 108 each have at least one common control channel used within the zone.
One is set. Those 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。FIG. 3 shows the configuration of a mobile station in an embodiment of the present invention.
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。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, and 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２０７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 timing generation circuit 205
Based on the frame timing from the control circuit 207
This circuit measures the reception level by switching the frequency of the frequency synthesizer 203 specified by the frequency synthesizer 203. A timing generation circuit 205 is a circuit that generates frame timing. The encoding circuit 206 is a circuit that multiplexes the information signal from the base station 102 and the control signal from the control circuit 207 into a TDMA frame, and further encodes the signal for transmission over a wireless section. The control circuit 207 controls the mobile station 101 using the signal from the reception level measuring circuit 204 and the 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, of which the control signal is sent to the control circuit 207.
The information signal is sent to 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＋０１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
て測定されたレベルを制御回路２０７に報告する。Next, the reception level measurement operation of the mobile station 101 in the configuration shown in FIG. 3 will be explained. Mobile station +01 transmits the zone determination frequencies of neighboring base stations 103 to 108 reported from base station 102 from control circuit 207 to reception level measurement circuit 204.
The received level measurement circuit 204 switches the synthesizer 203 to the zone determination frequency from the timing specified by the timing generation circuit 205 for the time of the slot not used for communication, and the demodulation circuit 202 at that time.
The measured level is reported to the control circuit 207.
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チヤネルのＴＤＭＡ
方式におし・て移動局１０１か周辺ゾーンの受信レベル
の測定のタイミングと移動局１０■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Ｆｌは同図
（Ａ）の３０ａ〜３０ｆ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 shows a diagram for explaining the measurement operation at the mobile station in the embodiment of the present invention. The figure shows 3-channel TDMA
The timing of measuring the reception level of the mobile station 101 in the surrounding zone and the frame of the reception frequency of the mobile station 101 are shown in the figure. In the figure, (A) shows a reception signal of the mobile station 101, and (B) of the figure shows a frame of the reception frequency of the mobile station 101. Frame Fl in the frame shown in FIG. 4B is the frequency of the wireless channel used for communication at timings 30a to 30f in FIG. Frame F2-F7
is the frequency of the common control channel of the peripheral base stations 103 to 108.
基地局１０２は移動局１０１か通信を開始したときに、
周辺基地局１０３〜１０Ｂ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ｌｏｔに報告する。移動局ｌｏｔ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Ｆ２〜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 base station 102 starts communicating with the mobile station 101,
One frequency frame F2 for each of the common control channel frequencies used by the peripheral base stations 103 to 10B.
~F7 to mobile station lot. The mobile station lot connects to neighboring base stations 103 to 103 during slots not used for communication.
The synthesizer 203 switches to the frequency reported from the base station 108, receives frequency frames F2 to F7 from the surrounding zone at timings 31a to 31f in FIG. Measure.
次に各実施例について説明する。Next, each example will be described.
第１実施例
移動局１０１か基地局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
のだけか基地局１０２に送信てきるようにしたものであ
る。First Embodiment When reporting the reception level to either the mobile station 101 or the base station 102, conditions for reporting are set, and only those that meet the conditions are transmitted to the base station 102.
受信レベルを基地局１０２ ｉ二報告するための条件と
して、受信レベルか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ｌｏｔ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はその結果に基つ
き、所定の閾値以上の受信レベルを選出して、基地局１
０２へ報告する制御を行う。As a condition for reporting the reception level to the base station 102i, an example will be described in which only reception levels that are at a level equal to or higher than a predetermined threshold are reported. The mobile station lot receives the received electric field level of the surrounding base stations 103 to 108 in Fig. 4 (A).
Frames F2. F3. F4. F5.
F6. Measure F7. Based on the results, the mobile station 101 selects the reception level equal to or higher than a predetermined threshold and transmits it to the base station 1.
Controls reporting to 02.
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か測定した
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か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か閾値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たけか基地局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てきる。FIG. 5 shows the reception level of the first embodiment of the present invention. In the figure, levels 501 to 506 indicate the received electric field levels of the surrounding base stations 103 to 108 measured by the mobile station-101. Further, a broken line 507 indicates a threshold value 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 equal to or higher than the threshold value 507 is reported. In the example shown in the same figure, among the measured reception levels 501 to 506, those that are higher than the threshold 507, that is, the levels 502 and 503, are reported to the base station 102, so all reception level measurement results 501 to 506 are reported. The signal length can be shortened compared to conventional control.
この方法により受信電界レベルか低く、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
を防止することか可能となるため制御チャネルの圧迫を
緩和てきる。This method makes it possible to prevent reporting of the reception level of a zone that has a low reception electric field level and is not suitable as a candidate for channel switching, thereby alleviating the pressure on the control channel.
第２実施例
第１実施例では移動局１０１か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か予め定め
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 was shown in which only the mobile station 101 reports a level equal to or higher than a preset threshold, but in this embodiment, control is performed by calculating a difference instead of a threshold. . Only the difference between the received electric field level of the surrounding base stations 103 to 108 and the received electric field level of the communicating base station 102, which is a predetermined value or more, is 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ｐ ２゜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１０２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
から差分か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 adjusts each frame p 2°F3 . F4. F5. F6
．． The received electric field levels of the surrounding base stations 103 to 108 of F7 are measured. The difference between the measured reception electric field level of base station 102 during communication and the reception electric field level of peripheral base stations 103 to 108 is calculated as follows: For example, in the case of the reception level of peripheral base station 103, the difference = level) - (reception level of base station 102 during communication). From the results, control is performed to select a difference or one that is greater than a predetermined value and report it to the base station 102.
従来の方式では通信中の基地局１０２てこの差分を計算
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て選定するた
め無線区間の制御信号の量も減少できる。In the conventional method, the difference in the leverage of the base station 102 in communication is calculated to determine the switching destination, but by providing this function in the mobile station 101, the load on the base station 102 can be distributed and the switching destination can be decided. Since candidates are selected by the mobile station 102, the amount of control signals in the wireless 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か前回基地局＋
０２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, the conditions for reporting the reception level from the mobile station 101 to the base station 102 are as follows:
Store the report data reported in 02 in the storage means,
The amount of change between the reception level measured in the same manner as in the first and second embodiments and the previous reported data is determined. Only when the amount of change is greater than or equal to a preset threshold, a report is made to the 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
か閾値以上になった場合には移動局１０１は基地局１０
２にその受信レベルを報告する。That is, the mobile station 101 sequentially measures the received electric field levels of the surrounding base stations 103 to 108, compares the received level data previously reported to the base station 102 with the received level data to be reported this time, and measures all the surrounding base stations. 103-108
If the amount of change in the received level data is less than a threshold value, control is performed so that it is not reported to the base station 102. On the other hand, if the amount of change exceeds the threshold, the mobile station 101
2 to report the reception level.
これにより、フェージングの周期に比へて低速で移動し
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と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
とか可能となるため、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かある。As a result, the received electric field level of a mobile station moving at a slow speed compared to the fading period will change less during a single measurement, but by performing such control, the amount of change in the received electric field level of a mobile station that is moving at a low speed compared to the fading period will be small. Since it is possible to suppress reporting of the reception level to the base station 102 when there is almost no change in the received level, it is possible to reduce the load on the base station 102 and reduce the control information in the wireless section. be.
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かで
きる。If the reporting conditions are set from the base station 102 when performing the control in the first to third embodiments described above, it is possible to set values that match the installation conditions 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
ヒックかあまり集中しないエリアの基地局では頻繁に受
信レベルの報告か発生するような値を設定し、これを報
告条件とすることか可能である。In other words, for base stations in areas where traffic is constantly concentrated, a value is set to suppress the reporting frequency, and conversely, for base stations in areas where traffic is not very concentrated, values are set so that reception level reports occur frequently. It is possible to set a value and use this as a reporting 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。Furthermore, in a system configuration in which the base station traffic situation can be grasped from the communication channel usage rate, control channel usage rate, control channel usage rate, base station control unit operation rate, etc., it is possible to understand the traffic situation. In such a system configuration, it is also possible to control the reporting conditions to the base station to be changed depending on the degree of traffic concentration. An example of this 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か増
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 will be shown in which a threshold value is specified from the base station 102 to the mobile station 101 using a control channel when performing the control of the first embodiment. When the number of mobile stations in the wireless zone of the base station 102 increases and the processing capacity of the base station 102 decreases, the reporting frequency of the mobile stations in the area can be reduced by setting a high threshold. to reduce the load associated with 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
１０２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かできる。On the other hand, when the base station 102 has sufficient processing capacity, by setting the threshold low, the mobile station will frequently report the reception level, the base station 102 will always have the latest data, and it will prevent sudden interference. Even if it becomes difficult for the base station 102 to receive a control signal from a mobile station because of this, the destination zone of the mobile station can be determined based on the previous data.
第５実施例
第２実施例の制御を行う場１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。一般にサービスゾーンの境界付近は隣接する
基地局のどちらとても電話を送受信できるようにゾーン
をオーバーラツプするように設計している。このため、
移動局１０１ての周辺基地局１０３〜１０８の受信レベ
ルか通信中の基地局１０２の受信レベルより大きくなる
エリアか存在する。Fifth Embodiment An example will be shown in which, in the case of controlling the second embodiment, the determination value of the received level difference is designated from the base station 102 using a control channel. Generally, the zones are designed to overlap near the boundaries of service zones so that calls can be sent and received from either adjacent base station. For this reason,
There are areas where the reception level of the surrounding base stations 103 to 108 of the mobile station 101 is higher than the reception level of the base station 102 with which the mobile station 101 is communicating.
このようなシステムはレベル差分の判一定値を操作する
ことによりオーバーラツ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
バーラツプエリアか小さくなる。従って、特定のエリア
にトラヒックか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
果かある。Such a system can manipulate the size of the overlap area by manipulating the fixed value of the level difference. That is, if the judgment value for the difference in reception level is made smaller, the overlap area will be made smaller. Therefore, when traffic is concentrated in a specific area, there is an effect of dispersing mobile stations near zone boundaries by channel switching to surrounding base stations.
逆に受信レベル差分の判定値を大きくすると、移動局は
ゾーン移行判定か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。On the other hand, if the determination value of the received level difference is increased, the mobile station will be slower in determining zone transition, so channel switching to neighboring base stations can be suppressed.
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配下の移動局の数か増えて、基地局
１０２の処理能力か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
力に余裕かあ、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１．０１に対して頻
繁にレベル報告をさせ、基地局１０２ては常に最新のデ
ータを備え、急激な干渉等のために移動局１０１からの
制御信号か基地局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か可能になる。Sixth Embodiment When performing the control of the third embodiment, an example will be 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. When the number of mobile stations under the base station 102 increases and the processing capacity of the base station 102 decreases, the base station 102 lowers the reporting frequency of the mobile station 101 by setting a large threshold and reports the reception level. This has the effect of reducing the load on the base station 102 related to this. On the other hand, when the base station 102 does not have sufficient processing capacity, the base station 102 sets a small threshold for the amount of change, causing the mobile station 1.01 to frequently report the level, and the base station 102 The mobile station always has the latest data, and even if it becomes difficult for the base station 102 to receive the control signal from the mobile station 101 due to sudden interference, etc., the mobile station 101 can use the previous reception level data to determine the destination of the mobile station 101. It becomes possible to perform zone judgment.
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、実際のシステムては、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か現実的で、
ある。そこで、移動局１０１から基地局１０２’＞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、制御情味信号の信号長を短くする方法も効果
的である。In the first to sixth embodiments described above, an example was explained in which all items that satisfy predetermined conditions are reported to the base station 102, but in actual systems, the processing capacity of the base station and the control Considering the delay, is it realistic to treat it as a candidate for channel switching and limit the number of base stations?
be. Therefore, it is also effective to determine in advance the maximum number of reception level measurement results of neighboring base stations to be reported from the mobile station 101 to the base station 102', and to shorten the signal length of the control flavor signal.
また、基地局１０２は移動局１０１か受信レベルを報告
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、処理負荷か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。Furthermore, the base station 102 specifies the cycle at which the mobile station 101 reports the reception level. At this time, according to the degree of processing load on the base station 102, if the processing load is large, the reporting period is lengthened, and the frequency with which the mobile station 101 reports to the base station 102 is suppressed.
一方、処理負荷か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。On the other hand, when the processing load is small, it is also effective for the base station 102 to shorten the reporting period and increase the frequency of reporting to the base station 102.
上記の実施例はそれぞれ、２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 two separate controls, it is even more effective to use them in combination. An example of this combination will be explained 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。The base station 102 of the seventh embodiment informs the mobile station 101 of the frequency measured at the start of communication, the level difference threshold shown in the second embodiment as a condition for reporting from the base station 102, and the threshold value of the level difference shown in the third embodiment. A long cycle and a short cycle are specified as the threshold value of the indicated level change amount, the maximum number of reports, and the 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
、ＴＩ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 shows a diagram for explaining the processing of the mobile station 101 according to the seventh embodiment of the present invention. In the figure, α is a threshold for a level difference, TI is a short reporting period, T2 is a long reporting period, and BL is the difference between the reception level of a neighboring base station and the reception level of the base station 102 in 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かレベル差分の閾値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かαを越え
ていない間は長い報告周期Ｔ２をタイムアツプさせ（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 explained using the same figure. First, the base station 102 specifies reception level reporting conditions 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 surrounding base stations 103 to 108, and determines the difference BL between the reception level of each of the surrounding base stations 103 to 108 and the reception level of the base station 102 with which it is communicating.
is calculated (step 63). The mobile station 101 determines whether the received level difference BL exceeds the level difference threshold α (step 64). As long as the reception level difference BL or α is not exceeded, the long reporting cycle T2 is timed out (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Ｔｌ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をタイムアツプしくステップ７１）、ＴＩの
報告周期で受信レベルの差ＢＬかレベル差分の閾値αを
越えているかを判断する（ステップ７２）。ＢＬか閾値
αを越えていない場合にはステップ６２へ移行し、ＢＬ
か閾値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）変化量かβを越
えて入れば、基地局１０２に受信レベルの報告を行う。On the other hand, if the reception level difference BL exceeds α,
The reporting period T2 is cut off (step 67), and the reception level is reported to the base station 102 (step 68). Next, switch to a short reporting cycle Tl (step 69) and step 63
The reception level is measured in the same manner as (step 70). The reporting cycle T1 is timed up (step 71), and it is determined whether the reception level difference BL exceeds the level difference threshold α in the TI reporting cycle (step 72). If the BL does not exceed the threshold α, the process moves to step 62, and the BL
If the amount of change exceeds the threshold value α, the amount of change in the reception level is compared with the amount of change threshold value β (step 73), and if the amount of change exceeds the amount of change β, the reception level is reported to the base station 102.
また、変化量かβを越えていない場合にはステップ６９
に移行する。Also, if the amount of change does not exceed β, step 69
to move to.
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、候補かない場合には報告頻度を抑える
制御か可能になる。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 above control, it is possible to frequently report the reception level to the base station 102 when there are candidates for switching destination, and to suppress the reporting frequency when there are no candidates. Furthermore, by setting the reception level difference threshold, the reception level change threshold β, and the reporting cycle according to the traffic situation, control can be performed in accordance with the processing capacity of the base station 102 and the usage rate of communication channels and control channels. becomes possible.
本発明によれば、移動局か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
状況に応して報告条件を設定することにより特定のゾー
ンにトラヒックか集中することを防止することか可能に
なる。According to the present invention, when reporting the received electric field level of neighboring base stations to the base station for mobile station zone determination, the reporting frequency and control signal amount of the mobile station are reduced to prevent control channel pressure. It becomes possible to do so. Furthermore, it is possible to reduce the burden on the base station. Furthermore, by specifying reception level reporting conditions from the base station to the mobile station and setting the reporting conditions according to the traffic situation at the base station, it is possible to prevent traffic from concentrating 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、２
０１・・・□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
。
特許出願人 日本電信電話株式会社
本発明の原理説明図
第１図
一般的な自動車電話方式）こおけるシステム構成図第２
図
本発明の一実施例の移動局の構成図
第３図
（Ａ）
「１ 「２ 戸ＩＦ：ろ Ｆｉ Ｆ４ Ｆｊ
Ｆ５ Ｆ Ｆ６ ＦＩ Ｆ７移動局受
信周波数
（Ｂ）
本発明の一実施例の移動局て゛の測定動作の説明図第４
図Fig. 1 is a diagram 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 a mobile station diagram in an embodiment of the present invention. FIG. 5 is a diagram for explaining the measurement operation at the station; FIG. 5 is a diagram showing the reception level of the first embodiment of the present invention; FIG. 6 is a diagram for explaining the processing of the mobile station according to the seventh embodiment of the present invention. This is a diagram. 101...Mobile station, 102-108...Base station, 2
01...□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. Patent Applicant Nippon Telegraph and Telephone Corporation Diagram explaining the principle of the present invention Figure 1 General car phone system) System configuration diagram 2
Figure 3 (A) Configuration diagram of a mobile station according to an embodiment of the present invention
F5 F F6 FI F7 Mobile station reception frequency (B) Fourth explanatory diagram of measurement operation of a mobile station according to an embodiment of the present invention
figure
Claims (3)
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する移動通信方式。(1) A service area is covered by multiple base stations, communication is performed between the mobile station and the base station using a time division multiple access method, and surrounding stations are In a mobile communication system that measures the received electric field level of a station and reports the result to a base station, the mobile station determines whether the measured result of the received electric field level of the surrounding base station satisfies pre-stored conditions. A mobile communication system characterized in that the measurement result is reported to the base station only when the measurement result satisfies the condition.
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 the conditions for reporting measurement results from the base station to the mobile station are specified from the base station to the mobile station using a control channel.
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) At least one 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.
3. The mobile communication system according to claim 2, wherein the reporting condition is determined depending on one state.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04200032A true JPH04200032A (en) | 1992-07-21 |
| JP2992563B2 JP2992563B2 (en) | 1999-12-20 |
Family
ID=18267148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33353690A Expired - Lifetime JP2992563B2 (en) | 1990-11-29 | 1990-11-29 | Mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2992563B2 (en) |
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