JP2501369B2 - Channel switching method during communication in mobile communication - Google Patents
Channel switching method during communication in mobile communicationInfo
- Publication number
- JP2501369B2 JP2501369B2 JP2263138A JP26313890A JP2501369B2 JP 2501369 B2 JP2501369 B2 JP 2501369B2 JP 2263138 A JP2263138 A JP 2263138A JP 26313890 A JP26313890 A JP 26313890A JP 2501369 B2 JP2501369 B2 JP 2501369B2
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- Prior art keywords
- base station
- station
- channel
- communication
- signal
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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、移動通信における通信中チャネル切替え方
式に関し、特に高速で確実なチャネル切替えの行なえる
制御方式に係る。Description: TECHNICAL FIELD The present invention relates to a communication channel switching method in mobile communication, and more particularly to a control method capable of performing high-speed and reliable channel switching.
移動通信においては周波数の有効利用が最大の課題で
あり、このため所謂セル式と呼ばれる移動通信方式が一
般的である。これはサービスエリアを複数の基地局でカ
バーし、一定距離だけ離れた基地局どうしで同一周波数
を切り返して使用することにより周波数利用効率を向上
させるものである。１つの基地局のカバーするエリアは
セルと呼ばれており、セル半径を小さくするほど、より
近い距離で周波数が繰り返せるため周波数利用効率が向
上する。In mobile communication, effective use of frequency is the biggest problem, and for this reason, a so-called cell type mobile communication system is generally used. This is to improve the frequency utilization efficiency by covering the service area with a plurality of base stations, and switching back and using the same frequency between base stations separated by a certain distance. The area covered by one base station is called a cell, and the smaller the cell radius is, the more the frequency can be repeated at a closer distance, so that the frequency utilization efficiency is improved.
しかしこの反面、移動機が通信中の基地局エリアから
出て、隣接基地局のエリアに移行するチャンスが多くな
る。このとき通信中の基地局での受信レベルが低下する
から通信を継続させるためには、移動機が通信する相手
基地局を移行先の基地局に切り変える必要がある。基地
局までの有線伝送路の切替えとともに、移動機の周波数
を移行先基地局の空きチャネルに切り替える必要がある
ことから、これを通信中チャネル切替えという。However, on the other hand, there is a greater chance that the mobile station leaves the area of the base station in communication and moves to the area of the adjacent base station. At this time, since the reception level at the base station in communication decreases, in order to continue communication, it is necessary to switch the partner base station with which the mobile device communicates to the transfer destination base station. This is called in-communication channel switching because it is necessary to switch the frequency of the mobile device to an empty channel of the transfer destination base station together with switching of the wired transmission path to the base station.
第７図は従来の技術を説明するための方式構成図であ
って、１は中央制御局、２〜５は基地局、６〜９はセ
ル、10は移動機、11〜14は基地局と中央制御局間の伝送
路である。各基地局はさらに中央制御局１を経て固定電
話網（図示せず）に接続される。FIG. 7 is a system configuration diagram for explaining a conventional technique, in which 1 is a central control station, 2 to 5 are base stations, 6 to 9 are cells, 10 is a mobile unit, and 11 to 14 are base stations. It is a transmission line between central control stations. Each base station is further connected to a fixed telephone network (not shown) via the central control station 1.
今、移動機がセル８にあり基地局４と通信しているも
のとする。移動機が移動してセル７のエリアに入ったと
きの通信中チャネル切替えの制御動作を以下に説明す
る。It is now assumed that the mobile device is in cell 8 and is communicating with base station 4. The control operation of channel switching during communication when the mobile device moves into the area of the cell 7 will be described below.
基地局４と移動機10の距離がセル半径以上になるの
で、基地局４の受信レベルが規定値以下に低下する。こ
れを検出した基地局４は移動機10の通信中チャネル切替
えを伝送路13を介して中央制御局１に依頼する。Since the distance between the base station 4 and the mobile device 10 becomes equal to or larger than the cell radius, the reception level of the base station 4 drops below the specified value. Upon detecting this, the base station 4 requests the central control station 1 to switch the communication channel of the mobile device 10 via the transmission line 13.
中央制御局１は基地局４の周辺の基地局2,3、およ
び５に対して、移動機10からの電波を監視するよう伝送
路11,12および14を介して指示する。The central control station 1 instructs the base stations 2, 3 and 5 around the base station 4 to monitor the radio waves from the mobile unit 10 via the transmission lines 11, 12 and 14.
基地局2,3、および５は、監視するよう指示された
移動機の使用チャネルを受信し、その受信レベルを測定
する。測定結果は中央制御局１に報告される。The base stations 2, 3, and 5 receive the use channel of the mobile station instructed to monitor and measure the reception level thereof. The measurement result is reported to the central control station 1.
中央制御局１は基地局2,3および５からの報告の
内、最も高いレベルで受信した基地局を特定する。この
場合は基地局３が最大レベル受信局となる。The central control station 1 identifies the base station received at the highest level among the reports from the base stations 2, 3 and 5. In this case, the base station 3 becomes the maximum level receiving station.
中央制御局は基地局３に対して空き通信チャネル番
号（＃Ｎとする）を通知するよう指示する。The central control station instructs the base station 3 to notify the idle communication channel number (#N).
基地局３は指示に基づき、空き通信チャネル番号＃
Ｎを中央制御局１に報告する。Based on the instruction, the base station 3 sends an idle communication channel number #
Report N to central control station 1.
中央制御局１は基地局４に対して移動機10に通信チ
ャネル＃Ｎへの切り替え指示信号を送出するよう指示す
る。同時に基地局３に対して通信チャネル＃Ｎの送受信
機をオンとするよう指示し、対基地局の有線通信路を基
地局４から基地局３の通信チャネル＃Ｎに対応する回線
に切り替える。The central control station 1 instructs the base station 4 to send a switching instruction signal to the mobile station 10 to the communication channel #N. At the same time, the base station 3 is instructed to turn on the transceiver of the communication channel #N, and the wired communication path to the base station is switched from the base station 4 to the line corresponding to the communication channel #N of the base station 3.
基地局４は移動機10に対して通信チャネル＃Ｎへの
切替え信号を送出する。The base station 4 sends a switching signal to the communication channel #N to the mobile device 10.
移動機10は指示された通信チャネルに切り替える。
これにより、移動機は基地局３との間の通信チャネルを
確立することができる。The mobile device 10 switches to the instructed communication channel.
As a result, the mobile device can establish a communication channel with the base station 3.
以上説明したように、従来の方式においては、基地局
４で受信レベルの低下を検出してから実際に通信中チャ
ネル切替えが完了するまでには、中央制御局と基地局と
の間で数回の信号授受およびこれに伴う制御が必要であ
り、そのために多くの時間がかかると言う欠点があっ
た。従って、セル半径が小さい場合には、通信中チャネ
ル切替えが完了しない内にさらに隣のセルエリアに移行
してしまうことが起こり、通信中チャネル切替えが失敗
に終わることがある。これを避けるため、セル半径を一
定以下に小さくできない制約があり、これが周波数利用
率向上の限界になっていた。As described above, in the conventional method, it takes several times between the central control station and the base station from when the base station 4 detects a decrease in the reception level until the channel switching during actual communication is completed. However, there is a drawback in that it takes a lot of time because of the necessity of signal transmission / reception and control associated therewith. Therefore, when the cell radius is small, it may happen that the in-communication channel switching may be moved to the adjacent cell area before the in-communication channel switching is completed, and the in-communication channel switching may fail. In order to avoid this, there is a constraint that the cell radius cannot be reduced to a certain value or less, and this has been the limit for improving the frequency utilization rate.
本発明はこのような従来の問題点に鑑み、迅速な通信
中チャネル切替えを行なうことの可能な方式を提供する
ことを目的としている。The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a method capable of performing quick channel switching during communication.
本発明によれば、上述の目的は、前記特許請求の範囲
に記載した手段により達成される。According to the invention, the above mentioned objects are achieved by the means recited in the claims.
すなわち、本発明は、少なくとも、中央制御局、複数
の基地局、移動機とから構成され、移動機が通信中に基
地局のエリアを移行したときは移動機のチャネルを移行
先基地局の空き通信チャネルに切り替えさせて通信を継
続させる移動通信システムにおいて、中央制御局と該複
数基地局とをループ状に接続する伝送路を設け、各基地
局は自局の空き通信チャネルの番号を該ループ伝送路に
送出し、この信号を受信した基地局はループ伝送路上で
順次中継伝送し、自局と通信中の移動機に通信中チャネ
ル切り替えをさせる必要が生じた基地局は該ループ伝送
路の信号の中から、移行先基地局が送出した信号を選択
してその基地局の空き通信チャネル番号を読み取り、移
動機に対してこのチャネルに切り替えるよう指示する通
信中チャネル切替え方式である。That is, the present invention is composed of at least a central control station, a plurality of base stations, and a mobile device, and when the mobile device transfers the area of the base station during communication, the channel of the mobile device is free in the transfer destination base station. In a mobile communication system that continues communication by switching to a communication channel, a transmission line that connects the central control station and the plurality of base stations in a loop is provided, and each base station uses the number of its own unused communication channel as the loop. The base station that has sent this signal to the transmission line and received this signal relays and transmits it sequentially on the loop transmission line, and the base station that needs to cause the mobile station communicating with the local station to switch the channel during communication is the loop transmission line. From the signals, select the signal sent by the transfer destination base station, read the free communication channel number of that base station, and instruct the mobile device to switch to this channel. It is an expression.
本発明は、中央制御局と各基地局間をループ状に貫く
伝送路を設置し、各基地局は自局の１つまたは複数の空
き通信チャネル番号を上記ループ伝送路に送出し、自局
と通信中の移動機を隣接する特定の基地局（移行先基地
局）に通信中チャネル切替えさせる必要があることが判
明した基地局（移行元基地局）は、上記ループ伝送路で
伝送されている移行先基地局の空き通信チャネル番号の
１つを選択しその番号を移動機に送出して通信中チャネ
ル切替えを実行させることを最も主要な特徴とする。According to the present invention, a transmission line that penetrates in a loop between a central control station and each base station is installed, and each base station sends out one or more free communication channel numbers of its own station to the loop transmission line, The base station (transition source base station), which has been found to be required to switch the communicating mobile station to the adjacent specific base station (transition destination base station), is transmitted through the loop transmission line. The most main feature is that one of the available communication channel numbers of the transfer destination base station is selected and the number is transmitted to the mobile station to switch the channel during communication.
従来の技術では、通信中チャネル切替えの要求が発生
するたびに中央制御局は移行先基地局に対して空き通信
チャネル番号を問い合わせ、その結果を移行元基地局に
通知していたのに対して、本発明では、各基地局が常に
空き通信チャネル番号を放送しており、通信中チャネル
切替えの必要が生じた基地局ではこの情報をただちに利
用できる点が異なる。In the conventional technique, the central control station inquires the transfer destination base station of the free communication channel number each time a request for channel switching during communication occurs, and notifies the transfer source base station of the result. The present invention is different in that each base station always broadcasts an idle communication channel number, and a base station that needs to switch channels during communication can immediately use this information.
第１図は本発明の第一の実施例を説明する図であっ
て、15〜19は中央制御局１および基地局２〜５を経て中
央制御局に帰ってくるループ伝送路である。第２図はル
ープ伝送路を流れる信号の構成の例を示す図であって、
20は基地局識別番号、21は使用予定有無信号、22は空き
通信チャネル番号である。第３図は基地局装置の構成の
例を示す図であって、23はアンテナ、24は送受信機（１
つまたは複数のチャネルを送受信可能）、25は制御回
路、26は中央制御局との間の伝送路、27はループ伝送路
の一部で上位局からの伝送路、28は下位局への伝送路を
表わしている。FIG. 1 is a diagram for explaining the first embodiment of the present invention, and 15 to 19 are loop transmission lines returning to the central control station via the central control station 1 and the base stations 2 to 5. FIG. 2 is a diagram showing an example of the configuration of a signal flowing through the loop transmission line,
Reference numeral 20 is a base station identification number, 21 is a scheduled use presence / absence signal, and 22 is an idle communication channel number. FIG. 3 is a diagram showing an example of the configuration of the base station device, in which 23 is an antenna, 24 is a transceiver (1
One or more channels can be sent / received), 25 is a control circuit, 26 is a transmission path to a central control station, 27 is a part of a loop transmission path from a higher station, 28 is a lower station It represents a road.
各基地局にはそのセルエリア内のトラヒックに応じて
１つまたは複数の通信チャネルが割り当てられており、
これらチャネルの管理は制御回路25が行なっている。制
御回路25は割り当てられたチャネルの内、使用中でない
空きチャネル番号を第２図のフォーマットで自局識別符
号20、使用予定有無と使用予定の基地局識別符号を表わ
す信号21、を付加して22に符号化して下位局への伝送路
28に送出する。使用予定有無信号はこの場合使用予定な
しを表わすよう符号化する。一方伝送路27には上位局が
ループ伝送路上に送出した同様の信号が送られてくる。
基地局ではこれを受信し、下位局へ中継していく。Each base station is assigned one or more communication channels depending on the traffic within its cell area,
The control circuit 25 manages these channels. The control circuit 25 adds a free channel number which is not in use among the allocated channels to the station identification code 20 in the format shown in FIG. 2 and the signal 21 representing the presence / absence of the planned use and the base station identification code of the planned use. Coded to 22 and transmitted to lower stations
Send to 28. In this case, the planned use presence / absence signal is encoded so as to indicate that there is no planned use. On the other hand, the same signal sent by the upper station on the loop transmission line is sent to the transmission line 27.
The base station receives this and relays it to lower stations.
このように、各基地局の空き通信チャネル番号を表わ
す信号がループ伝送路の中を次々に中継されていくこと
になる。ループ伝送路を一巡してもとの送出元基地局に
信号が帰ってきたとき、基地局はその時点での空き通信
チャネル番号を22に乗せてループ伝送路に送り出す。空
き通信チャネルがない場合には空きがない旨を22で表示
する。また、基地局は空きチャネルとしてループ伝送路
に送出したチャネルについてはその信号が一巡して帰っ
てくるまでの間は他の通信には割り当てない。In this way, the signal indicating the idle communication channel number of each base station is relayed one after another in the loop transmission line. When the signal returns to the original transmission source base station after making a loop through the loop transmission line, the base station puts the empty communication channel number at that time on 22 and sends it out to the loop transmission line. If there is no available communication channel, 22 is displayed indicating that there is no available communication channel. Also, the base station does not allocate the channel sent to the loop transmission line as an idle channel to other communication until the signal makes a round and returns.
今、基地局４で通信中の移動機10がセルエリアを移行
し通信中チャネル切替えの必要が生じたとする。このと
き、従来の技術の項で説明したからの制御手順によ
って中央制御局は移行先基地局３を特定する。このあと
の制御動作を以下に説明する。Now, it is assumed that the mobile station 10 currently communicating with the base station 4 changes its cell area and needs to switch the channel during communication. At this time, the central control station specifies the transfer destination base station 3 by the control procedure described in the section of the conventional technique. The control operation after this will be described below.
中央制御局１は移行元基地局４に対して移動機10の
呼を基地局３に通信中チ ャネル切替えするよう指示す
る。また基地局あての有線伝送路を基地局４から基地局
３向けの伝送路に切り替えるとともに、基地局３に対し
て通信中チャネル切替えの切り替え先基地局になったこ
とを通知する。The central control station 1 instructs the transfer source base station 4 to switch the call of the mobile station 10 to the base station 3 during communication. In addition, the wired transmission path to the base station is switched from the base station 4 to the transmission path for the base station 3, and the base station 3 is notified that it has become the switching destination base station for switching the channel during communication.
通信中チャネル切替え指示の信号を中央制御局から
受信した基地局４はループ伝送路27で受信される信号の
中から基地局識別符号20が移行先基地局３の識別符号と
一致する信号を取り込み、その空きチャネル番号22（＃
Ｎ）を読み取る。The base station 4 which has received the signal for instructing channel switching from the central control station takes in the signal whose base station identification code 20 matches the identification code of the transfer destination base station 3 from the signals received on the loop transmission line 27. , Its free channel number 22 (#
Read N).
つぎに使用予定有無信号21を使用予定有りとし自局の識
別番号を付加して再びループ伝送路28に送出する。Next, the planned use presence / absence signal 21 is set to be used, and the identification number of its own station is added and the signal is sent again to the loop transmission line 28.
基地局４は移動機10に対して通信チャネル＃Ｎに切
り替えるよう通信中チャネル切替え信号を送出する。The base station 4 sends an in-communication channel switching signal to the mobile device 10 so as to switch to the communication channel #N.
基地局４で21の部分を変えられた信号はループ伝送
路を経てその送出元であ った基地局３に帰ってくる。
基地局３では帰ってきた信号のなかの21を見て基地局４
が通信中チャネル切り替えのために空き通信チャネル＃
Ｎを使用することを知り、＃Ｎの送受信機をオンにする
とともに、中央制御局１に対して移動機10が基地局４か
ら＃Ｎチャネル通信中チャネル切り替えしてくることを
通知する。The signal whose 21 part has been changed by the base station 4 returns to the base station 3 from which it was sent via the loop transmission line.
At the base station 3, seeing 21 of the returned signals, the base station 4
There are free communication channels to switch channels while communicating #
Upon knowing that N is used, the transceiver of #N is turned on, and the central control station 1 is notified that the mobile station 10 is switching channels from the base station 4 during #N channel communication.
中央制御局１は基地局３からの信号に基づいて、有
線伝送路を基地局４向けの回線から、基地局３の＃Ｎチ
ャネルに対応する回線に切り替える。以上により通信中
チャネル切り替えが完了する。The central control station 1 switches the wired transmission line from the line for the base station 4 to the line corresponding to the #N channel of the base station 3 based on the signal from the base station 3. By the above, the channel switching during communication is completed.
基地局３は一巡した信号を受信すると再び空き通信チ
ャネル番号を知らせる信号をループ伝送路に送出する
が、今までの空きチャネル＃Ｎはこの時点では空きでは
ないから、別の空きチャネル番号で送出する。空きチャ
ネルがなければチャネル番号の部分に空きがない旨表示
する。一巡した信号の21に使用予定表示がなされておら
ず、且つ自局でも使用予定がなければ、同じ空きチャネ
ルの番号を送出してもよいし、順に他の空きチャネル番
号を送出してもよい。When the base station 3 receives the rounded signal, it again sends a signal notifying the idle communication channel number to the loop transmission line, but since the idle channel #N so far is not idle at this point, it is sent out with another idle channel number. To do. If there is no free channel, it is displayed that there is no free channel number. If the usage schedule is not displayed on 21 of the signals that have made a round and there is no usage schedule at the local station, the same free channel number may be sent, or another free channel number may be sent in order. .
同一の移行先基地局に対して２つ以上の移行元基地局
がある場合には、ループ伝送路を回っている移行先基地
局の空き通信チャネル番号の信号を最初に受信した基地
局がこの空きチャネルを予約することになり、この基地
局より下位にある基地局では、使用予定有無信号が予定
有りと表示されている信号を受信することになるから、
この空きチャネルを使用しないで、次に使用予定有無信
号が予定なしとなっている信号が受信できるまで待つこ
とにより、同一空きチャネル捕捉の競合問題を解決する
ことができる。When there are two or more source base stations for the same destination base station, the base station that first receives the signal of the idle communication channel number of the destination base station that is circulating the loop transmission line Since a free channel will be reserved, a base station lower than this base station will receive a signal indicating that there is a planned use presence / absence signal,
By not using the idle channel and waiting until the next scheduled availability signal is received, the contention problem of the same idle channel acquisition can be solved.
第４図は基地局でループ伝送路の信号を送受するタイ
ミングの例を説明する図であって、上位局からの伝送路
27には201，211，221の信号が受信できる。この信号の2
01，211の部分、すなわち基地局識別符号および使用予
定有無信号を解読し、通信中チャネル切替えのために自
局で取り込むべき信号か否かを判断する。自局で取り込
むべき信号ではないと判断すると、201，211，221と同
じ信号を202，212，222に乗せ変えて、下位局への伝送
路28に送出する。自局で取り込むべき信号であると判断
した場合には201を202に乗せ変え、212に使用予定有り
の表示を立てて自局の識別符号を挿入し、さらに221を2
22に乗せ変えて202，212，222を伝送路28に送出する。FIG. 4 is a diagram for explaining an example of the timing of transmitting and receiving a signal on the loop transmission line at the base station, which is the transmission line from the upper station.
The 27 can receive signals of 20 1 , 21 1 , and 22 1 . 2 of this signal
The part of 0 1 , 21 1 , that is, the base station identification code and the planned use presence / absence signal are decoded, and it is determined whether or not the signal should be taken in by the local station for switching the channel during communication. If determined not to be the signal to be fetched by its own station, 20 1, 21 1, 22 1 of the same signal instead placed on 20 2, 21 2, 22 2, it is transmitted to a transmission line 28 to the lower station. When it is judged that the signal should be taken in by the own station, 20 1 is put on 20 2 again, a display indicating that it is scheduled to be used is made on 21 2 and the identification code of the own station is inserted, and 22 1 is set to 2
20 2 , 21 2 and 22 2 are sent to the transmission line 28 while being changed to 2 2 .
第５図は第二の実施例における無線信号伝送方式を説
明する図であって、８チャネルTDMAにおける信号送受信
タイミングを説明する図である。同図において、30〜39
は基地局送信タイムスロット、40〜49は基地局受信タイ
ムスロット、50は移動機の他チャネルレベル測定タイミ
ングを表わしている。第６図は各基地局の使用するチャ
ネルを説明する図である。基地局2,3,4,5はそれぞれ周
波数がF1,F2,F3,F4のチャネルを使用しているものとす
る。各移動機は、在圏セルの基地局で使用している周波
数で基地局と通信している。FIG. 5 is a diagram for explaining a radio signal transmission system in the second embodiment, and is a diagram for explaining signal transmission / reception timings in 8-channel TDMA. In the figure, 30 to 39
Is a base station transmission time slot, 40 to 49 are base station reception time slots, and 50 is another channel level measurement timing of the mobile station. FIG. 6 is a diagram for explaining channels used by each base station. The base stations 2, 3, 4, and 5 are assumed to use channels with frequencies of F1, F2, F3, and F4, respectively. Each mobile device communicates with the base station at the frequency used by the base station of the serving cell.
今、基地局４のエリアにいる移動機が周波数F3、送受
信タイムスロット30および41で通信しているとする。移
動機は30のタイムスロットの受信レベルを測定するとと
もに、30および41以外の時間40の間に受信周波数を切り
替えて周辺基地局から送信されている周波数F1,F2,F4の
チャネルを順次受信してその受信レベルを測定する。移
動機はタイムスロット30の受信レベル、すなわち、基地
局４からの電波の受信レベルと周辺基地局からの電波の
受信レベルを比較し、周辺受信基地局電波の受信レベル
の方が高い場合には、移動機がその基地局のエリアに移
行したと判断して、基地局に対して通信中チャネル切替
え信号を送信する。このとき、レベルを高く受信した周
波数（この場合は基地局３のF2）をチャネル切替え要求
信号に付加する。Now, it is assumed that the mobile device in the area of the base station 4 is communicating at the frequency F3 and the transmission / reception time slots 30 and 41. The mobile device measures the reception level of 30 time slots, switches the reception frequency during the time 40 other than 30 and 41, and sequentially receives channels of frequencies F1, F2, and F4 transmitted from the peripheral base stations. Measure its reception level. The mobile device compares the reception level of the time slot 30, that is, the reception level of the radio wave from the base station 4 with the reception level of the radio wave from the peripheral base station, and when the reception level of the radio wave of the peripheral reception base station is higher, , Determines that the mobile device has moved to the area of the base station, and transmits a channel switching signal during communication to the base station. At this time, the frequency received at a high level (in this case, F2 of the base station 3) is added to the channel switching request signal.
各基地局は隣接基地局で使用している周波数を記憶し
ており、チャネル切替え要求信号の中の周波数情報か
ら、移動機の移行先基地局を判断することができる。す
なわち、基地局４は自局で通信中の移動機10を隣接の基
地局３に通信中チャネル切替えさせる必要が生じたこと
が分かる。基地局はループ伝送路を流れている信号から
この移行先基地局対応の信号を取り込み移動機にチャネ
ル切替えするよう指示するとともに、中央制御局に対し
て移動機番号10と移行先基地局３の番号または名称、切
替え先のチャネル番号＃Ｎを通知する。中央制御局はこ
の通知に基づいて有線伝送路の切替えを行なう。移行先
基地局３の動作は第一の実施例と同じである。Each base station stores the frequency used by the adjacent base station, and the transfer destination base station of the mobile device can be determined from the frequency information in the channel switching request signal. That is, it is understood that the base station 4 needs to cause the adjacent base station 3 to switch the mobile station 10 that is communicating with itself to the adjacent base station 3. The base station takes in the signal corresponding to this transfer destination base station from the signal flowing through the loop transmission line and instructs the mobile station to switch the channel, and at the same time, instructs the central control station to set the mobile station number 10 and the transfer destination base station 3 The number or name and the channel number #N of the switching destination are notified. The central control station switches the wired transmission line based on this notification. The operation of the transfer destination base station 3 is the same as that of the first embodiment.
以上の説明では、基地局が送出する空き通信チャネル
情報信号に、そのチャネルの使用予定の有無を表示する
信号を付加することで説明したが、必ずしもこの信号は
必要がない。使用予定の有無を表示する信号が無い場合
は、通信中チャネル切替えの必要が生じた複数の基地局
が同じチャネルを異なる移動機に指定してしまうことが
生じ得る。しかし、次に説明するように、このような二
重指定の場合でもこれを検出して二重接続を避ける方法
が考えられるから、使用予定の有無を表示する信号は本
発明に不可欠なものではない。In the above description, a signal indicating whether or not the channel is scheduled to be used is added to the free communication channel information signal sent from the base station, but this signal is not always necessary. If there is no signal indicating whether or not to use the service, a plurality of base stations that need to switch channels during communication may assign the same channel to different mobile stations. However, as described below, even in the case of such double designation, a method of detecting this and avoiding double connection can be considered. Therefore, the signal indicating whether or not to use is not essential to the present invention. Absent.
すなわち、通信中チャネル切替えで新しいチャネルを
指定された移動機は、指定されたチャネルが正しいか否
かを確認するため一般的にループチェックを行なう。こ
れは、例えば新しいチャネルに切り替えたときに、移行
先基地局と移動機との間で移動機番号を含むループチェ
ック信号と呼ばれる信号を送受信する。このループチェ
ックは通信中チャネル切替えする呼ごとに行なわれ、特
定のチャネルに２つ以上の移動機が通信中チャネル切替
えのためのチャネル指定を受けたとしても、最初に移行
先基地局との間でループチェックが成立した移動機しか
このチャネルを使用することはできないことになる。That is, a mobile station, which has been designated a new channel by channel switching during communication, generally performs a loop check to confirm whether or not the designated channel is correct. For example, when switching to a new channel, a signal called a loop check signal including a mobile station number is transmitted and received between the transfer destination base station and the mobile station. This loop check is performed for each call for switching the channel during communication, and even if two or more mobile devices on a particular channel receive channel designation for channel switching during communication, the loop check is first performed with the transfer destination base station. This means that only mobile stations for which the loop check has been established can use this channel.
指定されたチャネルに切替えてもループチェックが不
成功に終わったため通信中チャネル切替えができなかっ
た移動機は、暫くは旧チャネルで通信したのち、移行先
から別の空き通信チャネル番号が送信されてきたときに
再び通信中チャネル切替えの動作に入ることによって若
干の時間遅れはあるものの、通信中チャネル切替えを完
了することができる。The mobile station that could not switch the channel during communication because the loop check was unsuccessful even after switching to the specified channel, communicated with the old channel for a while, and then another free communication channel number was sent from the migration destination. Although there is a slight time lag due to the operation of switching the channel during communication again at that time, the channel switching during communication can be completed.
また、中央制御局が基地局とは別に存在する場合を例
に説明したが、いづれかの基地局が中央制御局の役割を
する場合にも本発明は適用可能である。Further, although the case where the central control station exists separately from the base station has been described as an example, the present invention can be applied when any one of the base stations functions as the central control station.
以上説明したように本発明によれな、各基地局は自局
の空き通信チャネル番号をループ伝送路に送出し、通信
中チャネル切替えの必要が生じたとき基地局は直ちにこ
の空き通信チャネル番号を取り出して移動機に通知する
ことができるため、通信中チャネル切替えを短時間に完
了させることができる利点がある。As described above, according to the present invention, each base station sends out its own free communication channel number to the loop transmission line, and when it is necessary to switch channels during communication, the base station immediately outputs this free communication channel number. Since it can be taken out and notified to the mobile device, there is an advantage that the channel switching during communication can be completed in a short time.
第１図は本発明の第一の実施例を説明する図、第２図は
ループ伝送路を流れる信号の構成の例を示す図、第３図
は基地局装置の構成の例を示す図、第４図は基地局でル
ープ伝送路の信号を送受するタイミングの例を説明する
図、第５図は第二の実施例における無線信号伝送方式を
説明する図、第６図は各基地局の使用するチャネルを説
明する図、第７図は従来の技術を説明するための方式構
成図である。 １…中央制御局、２〜５…基地局、６〜９…セル、10…
移動機、11〜14…基地局と中央制御局間の伝送路、15〜
19…ループ伝送路、20…基地局識別番号、21…使用予定
有無信号、22…空き通信チャネル番号、23…アンテナ、
24…送受信機、25…制御回路、26…中央制御局との間の
伝送路、27…上位局からの伝送路、28…下位局、30〜39
…基地局送信タイムスロット、40〜49…基地局受信タイ
ムスロット、50…移動機の他チャネルレベル監視タイミ
ング。FIG. 1 is a diagram for explaining a first embodiment of the present invention, FIG. 2 is a diagram showing an example of a configuration of a signal flowing through a loop transmission line, FIG. 3 is a diagram showing an example of a configuration of a base station device, FIG. 4 is a diagram for explaining an example of the timing of transmitting and receiving a signal on the loop transmission line at the base station, FIG. 5 is a diagram for explaining the wireless signal transmission system in the second embodiment, and FIG. 6 is for each base station. FIG. 7 is a diagram for explaining channels to be used, and FIG. 7 is a system configuration diagram for explaining a conventional technique. 1 ... Central control station, 2-5 ... Base station, 6-9 ... Cell, 10 ...
Mobile station, 11-14 ... Transmission line between base station and central control station, 15-
19 ... Loop transmission line, 20 ... Base station identification number, 21 ... Scheduled use presence / absence signal, 22 ... Free communication channel number, 23 ... Antenna,
24 ... Transceiver, 25 ... Control circuit, 26 ... Transmission path to central control station, 27 ... Transmission path from upper station, 28 ... Lower station, 30 to 39
... base station transmission time slot, 40 to 49 ... base station reception time slot, 50 ... other channel level monitoring timing of mobile device.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−248838（ＪＰ，Ａ) 特開 平２−206235（ＪＰ，Ａ) 特開 平１−248838（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-1-248838 (JP, A) JP-A-2-206235 (JP, A) JP-A-1-248838 (JP, A)
Claims (1)
移動機とから構成され、移動機が通信中に基地局のエリ
アを移行したときは移動機のチャネルを移行先基地局の
空き通信チャネルに切り替えさせて通信を継続させる移
動通信システムにおいて、 中央制御局と該複数基地局とをループ状に接続する伝送
路を設け、 各基地局は自局の空き通信チャネルの番号を該ループ伝
送路に送出し、 この信号を受信した基地局はループ伝送路上で順次中継
伝送し、 自局と通信中の移動機に通信中チャネル切り替えをさせ
る必要が生じた基地局は該ループ伝送路の信号の中か
ら、移行先基地局が送出した信号を選択してその基地局
の空き通信チャネル番号を読み取り、移動機に対してこ
のチャネルに切り替えるよう指示することを特徴とする
移動通信における通信中チャネル切替え方式。1. At least a central control station, a plurality of base stations,
Central control in a mobile communication system that is composed of a mobile device and continues the communication by switching the channel of the mobile device to an empty communication channel of the transfer destination base station when the mobile device moves the area of the base station during communication. A transmission line that connects the station and the plurality of base stations in a loop is provided, and each base station sends the number of the unused communication channel of its own station to the loop transmission line, and the base station that receives this signal is on the loop transmission line. The base station that needs to switch the channel during communication to the mobile station that is communicating with the local station selects the signal sent by the transfer destination base station from the signals on the loop transmission path. A communication channel switching method in mobile communication, which reads an idle communication channel number of the base station and instructs a mobile device to switch to this channel.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263138A JP2501369B2 (en) | 1990-10-02 | 1990-10-02 | Channel switching method during communication in mobile communication |
| CA002314419A CA2314419C (en) | 1990-10-02 | 1991-09-30 | Method of handover and route diversity in mobile radio communication |
| CA002052466A CA2052466C (en) | 1990-10-02 | 1991-09-30 | Method of handover and route diversity in mobile radio communication |
| EP95116564A EP0700173B1 (en) | 1990-10-02 | 1991-10-01 | Method of route diversity in mobile radio communication systems |
| EP91116795A EP0479255B1 (en) | 1990-10-02 | 1991-10-01 | Method of handover and route diversity in mobile radio communication |
| DE69132954T DE69132954T2 (en) | 1990-10-02 | 1991-10-01 | Path diversity method in mobile radio communication systems |
| DE69124049T DE69124049T2 (en) | 1990-10-02 | 1991-10-01 | Procedures for handover and path diversity in mobile communication |
| US07/770,104 US5317623A (en) | 1990-10-02 | 1991-10-02 | Method of handover and route diversity in mobile radio communication |
| US08/199,572 US5408514A (en) | 1990-10-02 | 1994-02-22 | Method of handover and route diversity in mobile radio communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263138A JP2501369B2 (en) | 1990-10-02 | 1990-10-02 | Channel switching method during communication in mobile communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04140937A JPH04140937A (en) | 1992-05-14 |
| JP2501369B2 true JP2501369B2 (en) | 1996-05-29 |
Family
ID=17385341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263138A Expired - Fee Related JP2501369B2 (en) | 1990-10-02 | 1990-10-02 | Channel switching method during communication in mobile communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2501369B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG112814A1 (en) | 2000-11-13 | 2005-07-28 | Ntt Docomo Inc | Mobile communication system and distributed broadcast information control method in mobile communication system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02206235A (en) * | 1989-02-06 | 1990-08-16 | Nippon Telegr & Teleph Corp <Ntt> | Communication channel switching system in mobile communication |
-
1990
- 1990-10-02 JP JP2263138A patent/JP2501369B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04140937A (en) | 1992-05-14 |
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