JP2704272B2 - Channel switching method during communication - Google Patents
Channel switching method during communicationInfo
- Publication number
- JP2704272B2 JP2704272B2 JP63238690A JP23869088A JP2704272B2 JP 2704272 B2 JP2704272 B2 JP 2704272B2 JP 63238690 A JP63238690 A JP 63238690A JP 23869088 A JP23869088 A JP 23869088A JP 2704272 B2 JP2704272 B2 JP 2704272B2
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- Prior art keywords
- mobile
- channel
- switching
- synchronization
- station
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Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、ディジタル移動通信方式における、通信
中チャネル切替方式に関するものである。Description: TECHNICAL FIELD The present invention relates to a channel switching method during communication in a digital mobile communication system.
（従来の技術） 以下、図面に従って従来方式について説明する。(Prior Art) Hereinafter, a conventional method will be described with reference to the drawings.
第８図は、従来のディジタル移動通信方式の構成を示
す図であり、１は移動制御局、２は移動局である。FIG. 8 is a diagram showing a configuration of a conventional digital mobile communication system, wherein 1 is a mobile control station, and 2 is a mobile station.
切替前後の無線チャネルをそれぞれ無線チャネル1,2
とし、また無線チャネル1,2の周波数をそれぞれf1,f2と
仮定する。The wireless channels before and after switching are wireless channels 1 and 2, respectively.
It is assumed that the frequencies of the wireless channels 1 and 2 are f 1 and f 2 , respectively.
第８図において、移動機２は移動制御局１より、切り
替え先チャネルである無線チャネル２の周波数情報を含
んだチャネル切替指示信号を受信すると、通信周波数を
f1からf2に切り替える。この後、無線チャネル２の同期
確立を行い、同期確立後、該チャネルを介してチャネル
切替が完了したことを示すチャネル切替完了信号を移動
制御局１に返送する。移動制御局１では該信号を受信す
ると、ディジタル伝送路と無線チャネル１との接続を、
ディジタル伝送路と無線チャネル２との接続に接続替え
を行い、以後、無線チャネル２を介して通信を再開す
る。In FIG. 8, when the mobile station 2 receives a channel switching instruction signal including the frequency information of the wireless channel 2 as the switching destination channel from the mobile control station 1, the mobile station 2 changes the communication frequency.
switch from f 1 to f 2. Thereafter, the synchronization of the wireless channel 2 is established, and after the synchronization is established, a channel switching completion signal indicating that the channel switching is completed is returned to the mobile control station 1 via the channel. When the mobile control station 1 receives the signal, it establishes a connection between the digital transmission path and the wireless channel 1.
The connection between the digital transmission path and the wireless channel 2 is switched, and thereafter, the communication via the wireless channel 2 is restarted.
（発明が解決しようとする課題） 以上説明した通り、従来の方式では移動機から返送さ
れるチャネル切替完了信号によって、無線チャネルとデ
ィジタル伝送路の接続切替を行っているため、該信号の
信号遅延、信号処理時間の分だけチャネル切替時間が大
きくなる。またチャネル切替完了信号が紛失、あるいは
誤った場合には、移動交換局においてスイッチ切替がで
きないという問題があり、仮に信号の再送等でこれを回
避しようとしても、チャネル切替時間が増大するという
問題があった。(Problems to be Solved by the Invention) As described above, in the conventional method, the connection switching between the wireless channel and the digital transmission path is performed by the channel switching completion signal returned from the mobile device, so that the signal delay of the signal is delayed. , The channel switching time becomes longer by the signal processing time. Also, if the channel switching completion signal is lost or wrong, there is a problem that the mobile switching center cannot perform switch switching, and even if it is attempted to avoid this by retransmission of a signal, the channel switching time increases. there were.
本発明では、このような従来方式の問題点を解決し、
チャネル切替時間の短縮化を実現したチャネル切替方式
を提供することを目的とする。The present invention solves such problems of the conventional method,
It is an object of the present invention to provide a channel switching method that can shorten the channel switching time.
（課題を解決するための手段） 前記目的を達成するための本発明の特徴は、複数の無
線ゾーン内に散在する移動機と、該移動機とディジタル
信号の送受信を行なう少なくともひとつの移動制御局又
は移動交換局から構成され、移動機と移動制御局又は移
動交換局が通信中に通信に使用する無線チャネルを切替
える通信中チャネル切替方式において、移動制御局又は
移動交換局が各無線チャネルの同期監視装置を具備して
切替前後の各無縁チャネルの同期状態を監視し、被切替
チャネルの同期外れと、切替後のチャネルの同期確立を
契機として、移動制御局又は移動交換局で無線チャネル
の切替を行なう通信中チャネル切替方式にある。(Means for Solving the Problems) A feature of the present invention to achieve the above object is to provide a mobile station scattered in a plurality of wireless zones and at least one mobile control station for transmitting and receiving a digital signal to and from the mobile station. Alternatively, in a communication channel switching method in which a mobile station and a mobile control station or a mobile switching station are configured to switch a wireless channel used for communication during communication, the mobile control station or the mobile switching station synchronizes each wireless channel. A monitoring device is provided to monitor the synchronization status of each of the channels before and after the switching, and the mobile control station or the mobile switching center switches the radio channel when the channel to be switched loses synchronization and the channel after the switching is established. During communication.
（作用） 本発明によると、被切替チャネルの同期外れと、切替
後のチャネルの同期確立を契機として無線チャネルの切
替を行なう。従来のチャネル切替完了信号が不用でチャ
ネル切替時間の短縮を図ることができ、本発明の目的が
達成される。(Operation) According to the present invention, the wireless channel is switched upon the loss of synchronization of the switched channel and the establishment of synchronization of the switched channel. Since the conventional channel switching completion signal is unnecessary, the channel switching time can be reduced, and the object of the present invention is achieved.
（実施例１） まず、第１図〜第３図を用いて、本発明によるチャネ
ル切替方式の第１の実施例を説明する。First Embodiment First, a first embodiment of a channel switching system according to the present invention will be described with reference to FIGS.
第１図は、本発明を適用した場合のディジタル移動通
信システムの構成例を示した図であり、1aは移動制御
局、２は移動局である。FIG. 1 is a diagram showing a configuration example of a digital mobile communication system to which the present invention is applied, where 1a is a mobile control station, and 2 is a mobile station.
第２図は移動制御局の1aの構成例を示した図であり、
３はディジタル伝送路と無線チャネルの接続を行うスイ
ッチ、41,42はそれぞれ無線チャネル1,2の同期状態を監
視する同期監視装置、５は移動制御局1aの各部を制御す
る移動制御局制御装置である。FIG. 2 is a diagram showing a configuration example of the mobile control station 1a,
Reference numeral 3 denotes a switch for connecting a digital transmission line to a wireless channel, reference numerals 4 1 and 4 2 denote synchronization monitoring devices for monitoring the synchronization status of the wireless channels 1 and 2, respectively, and reference numeral 5 denotes a mobile control station for controlling each section of the mobile control station 1a. It is a control device.
第３図は、第１図に示したシステム構成を適用したデ
ィジタル移動通信方式において、本発明を適用した場合
のチャネル切替シーケンス例を示した図であり、図中→
は制御信号を、はレイヤ１信号（同期情報）を示して
いる。FIG. 3 is a diagram showing an example of a channel switching sequence when the present invention is applied to a digital mobile communication system to which the system configuration shown in FIG. 1 is applied.
Indicates a control signal, and indicates a layer 1 signal (synchronization information).
第１図において、チャネル切替前後で通信に使用する
無線チャネルをそれぞれ無線チャネル１、無線チャネル
２と仮定する。また、無線チャネル1,2の周波数をそれ
ぞれf1,f2と仮定する。In FIG. 1, it is assumed that wireless channels used for communication before and after channel switching are wireless channel 1 and wireless channel 2, respectively. It is also assumed that the frequencies of wireless channels 1 and 2 are f 1 and f 2 , respectively.
以下、実施例１の動作について、第３図を参照して説
明する。Hereinafter, the operation of the first embodiment will be described with reference to FIG.
移動局２と移動制御局1aの間で通信に使用している無
線チャネルを、無線チャネル１から無線チャネル２に切
り替える場合には、まず、移動制御局制御装置５が移動
局２に対して、切替先の無線チャネルである無線チャネ
ル２の周波数情報（周波数f2）を含んだチャネル切替指
示信号を無線チャネル１経由で送出し、同時に同期監視
装置41に指示して、無線チャネル２の同期監視を開始す
る。When switching the wireless channel used for communication between the mobile station 2 and the mobile control station 1a from the wireless channel 1 to the wireless channel 2, first, the mobile control station control device 5 sends a channel switching instruction signal including frequency information of the wireless channel 2 is a switching destination wireless channel (frequency f 2) via the wireless channel 1, and instructs the synchronization monitoring apparatus 4 1 simultaneously, the synchronous radio channel 2 Start monitoring.
チャネル切替指示信号を受信した移動局２は、該信号
に含まれる周波数情報をもとに、通信周波数をf1よりf2
に変更する。この結果、移動制御局の無線チャネル１に
おいては同期外れが生じる。移動制御局1aにおいて、無
線チャネル１の同期状態を監視している同期監視装置41
は無線チャネル１の同期外れを検出し、この情報を移動
制御局制御装置５に通知する。The mobile station 2 having received the channel switching instruction signal changes the communication frequency from f 1 to f 2 based on the frequency information contained in the signal.
Change to As a result, synchronization is lost in the radio channel 1 of the mobile control station. In the mobile control station 1a, a synchronization monitoring device 41 that monitors the synchronization state of the wireless channel 1
Detects out-of-synchronization of the radio channel 1 and notifies the mobile control station controller 5 of this information.
周波数切替後、移動局２は、切替先のチャネルである
無線チャネル２との同期確立を行う。この際、同期確立
のために、例えば移動制御局1aより無線チャネル２に同
期用のパターンを送出する等の制御が必要である。無線
チャネル２の同期が確立すると、同期監視装置42は同期
の確立を検出し、この情報を移動制御局制御装置５に転
送する。移動制御局制御装置５では該情報をもとに、ス
イッチ３に対して、ディジタル伝送路と無線チャネル１
との接続を、ディジタル伝送路と無線チャネル２との接
続に切り替えるように指示し、切替を行う。一方、移動
局２は無線チャネル２の同期確立後、チャネル切替完了
信号を無線チャネル２経由で移動制御局1aに送出し、移
動制御局1aが該信号を受信すると、チャネル切替が完了
する。After the frequency switching, the mobile station 2 establishes synchronization with the wireless channel 2 that is the switching destination channel. At this time, in order to establish synchronization, for example, control such as transmitting a synchronization pattern from the mobile control station 1a to the wireless channel 2 is required. When the synchronization is established radio channel 2, the synchronization monitoring apparatus 4 2 detects the synchronization establishment, it transfers this information to the mobile control station control device 5. Based on the information, the mobile control station controller 5 sends the digital transmission path and the radio channel 1 to the switch 3.
Is switched to the connection between the digital transmission path and the wireless channel 2 and the switching is performed. On the other hand, after the synchronization of the wireless channel 2 is established, the mobile station 2 sends a channel switching completion signal to the mobile control station 1a via the wireless channel 2, and when the mobile control station 1a receives the signal, the channel switching is completed.
（実施例２） 次に、第４図〜第７図を用いて、本発明のチャネル切
替方式の第２の実施例を説明する。Second Embodiment Next, a second embodiment of the channel switching system of the present invention will be described with reference to FIGS.
第４図は、第２の実施例にチャネル切替方式を適用し
た場合のディジタル移動通信方式のシステム構成図であ
り、６は移動交換局、71,72は無線基地局（以下、単に
基地局と呼ぶ）である。基地局71,72と移動交換局６
は、それぞれディジタル伝送路1,2と、基地局〜移動交
換局間の制御信号転送用の信号回線1,2によって接続さ
れている。また、移動局２は基地局71,72とそれぞれ無
線チャネル1,2により接続される。Figure 4 is a system configuration diagram of a digital mobile communication system in the case of applying the channel switching method in the second embodiment, six mobile switching center, 7 1, 7 2 wireless base station (hereinafter, simply base Station). Base stations 7 1 and 7 2 and mobile switching center 6
Are connected to digital transmission lines 1 and 2, respectively, and signal lines 1 and 2 for transferring control signals between the base station and the mobile switching center. Further, the mobile station 2 is connected to the base stations 7 1 and 7 2 by wireless channels 1 and 2 , respectively.
第５図は、基地局71,72の構成例を示した図であり、
８は送受信装置、９は同期監視装置、10は同期情報挿入
装置、11は基地局各部を制御する基地局制御装置であ
る。FIG. 5 is a diagram showing a configuration example of the base station 71, 7 2,
Reference numeral 8 denotes a transmission / reception device, 9 denotes a synchronization monitoring device, 10 denotes a synchronization information insertion device, and 11 denotes a base station control device that controls each part of the base station.
第６図は、移動交換局６の構成例を示した図であり、
121,122は同期情報監視装置、13は移動交換局６の各部
を制御する移動交換局制御装置である。FIG. 6 is a diagram showing a configuration example of the mobile switching center 6,
Reference numerals 12 1 and 12 2 denote synchronization information monitoring devices, and reference numeral 13 denotes a mobile switching center control device that controls each section of the mobile switching center 6.
第７図は、第４図に示したシステム構成をとるディジ
タル移動通信方式において、本発明を適用した場合のチ
ャネル切替シーケンス例を示した図であり、図中→は制
御信号を、はレイヤ１信号（同期情報）を示してい
る。FIG. 7 is a diagram showing an example of a channel switching sequence in a case where the present invention is applied to the digital mobile communication system having the system configuration shown in FIG. 5 shows a signal (synchronization information).
以下、実施例２の動作について、第７図に示すシーケ
ンス図を参照して説明する。Hereinafter, the operation of the second embodiment will be described with reference to the sequence diagram shown in FIG.
移動局２と移動交換局６との間で通信に使用している
無線チャネルを、無線チャネル１から無線チャネル２に
切り替える場合には、まず移動交換局制御装置６が移動
局２に対して、切替先の無線チャネルである無線チャネ
ル２の周波数情報（周波数f2）を含んだチャネル切替指
示信号をディジタル伝送路１、基地局71、無線チャネ
ル１を介して送出する。また同時に、信号回線２を介し
て、基地局72に対してチャネル切替指示信号を送出
し、無線チャネル２の起動と、無線チャネル２の同期監
視を行うように指示する。該信号を受信した基地局72の
基地の基地局制御装置11は、送受信装置８に指示して無
線チャネル２を起動するとともに、同期監視装置９に指
示して無線チャネル２の同期監視を開始する。When switching the radio channel used for communication between the mobile station 2 and the mobile switching center 6 from the radio channel 1 to the radio channel 2, the mobile switching center controller 6 digital transmission path 1 the channel switching instruction signal including the frequency information (frequency f 2) of the radio channel 2 is a switching destination wireless channel, the base station 71, transmits over a wireless channel 1. At the same time, via the signal line 2, and transmits the channel switching instruction signal to the base station 7 2, instructs to perform the activation of the wireless channel 2, the synchronization monitoring radio channel 2. The base station of the received base of the base station 7 2 the signal controller 11 is configured to activate the wireless channel 2 directs the transceiver 8, start the synchronization monitoring radio channel 2 directs the synchronization monitoring device 9 I do.
チャネル切替指示信号を受信した移動局２は、該信
号に含まれる周波数情報をもとに、通信周波数をf1より
f2に変更する。この結果、無線チャネル１では同期外れ
が生じる。無線チャネル２の同期を監視中の基地局71の
同期監視装置９は、無線チャネル１の同期外れを検出す
ると、該情報を基地局制御装置11に通知する。基地局制
御装置11は同期情報挿入装置10に指示して、ディジタル
伝送路１に無線チャネル１の同期外れが生じたことを示
す同期情報を挿入する。情報の転送方法としては、例え
ば、ディジタル伝送路のレイヤ１フレームに情報転送用
のビット領域を設け、該領域に同期外れ・同期確立の表
示を行う等の方法を用いればよい。Mobile station 2 receives the channel switching instruction signal based on the frequency information included in the signal, the communication frequency from f 1
To change to f 2. As a result, the radio channel 1 loses synchronization. Synchronization monitoring device 9 of the base station 71 in the monitoring of the synchronous radio channel 2 detects the synchronization deviation radio channel 1, and notifies the information to the base station controller 11. The base station control device 11 instructs the synchronization information insertion device 10 to insert synchronization information indicating that the radio channel 1 has lost synchronization with the digital transmission line 1. As a method of transferring information, for example, a method may be used in which a bit area for information transfer is provided in a layer 1 frame of a digital transmission path, and information indicating loss of synchronization and establishment of synchronization is displayed in the area.
移動交換局６の同期情報監視装置121は、ディジタル
伝送路１上に転送されてくる前記同期情報を検出し、無
線チャネル２の同期外れが生じたことを移動交換局制御
装置13に通知する。Synchronization information monitoring device 12 first mobile switching center 6 detects the synchronization information that is transferred over the digital transmission path 1, and notifies the mobile switching center control device 13 that the desynchronization radio channel 2 occurs .
移動局２は、周波数切替後、切替先の無線チャネルで
ある無線チャネル２の同期確立を行う。基地局72の同期
監視装置９は無線チャネル２の同期確立を検出すると、
この情報を基地局制御装置11に通知し、基地局制御装置
11は同期情報挿入装置10に指示してディジタル伝送路２
に無線チャネル２の同期が確立したことを示す同期情報
をディジタル伝送路２に挿入する。After switching the frequency, the mobile station 2 establishes synchronization with the wireless channel 2 that is the switching destination wireless channel. When synchronization monitoring device 9 of the base station 7 2 detects the synchronization establishment wireless channel 2,
This information is notified to the base station controller 11, and the base station controller
Numeral 11 designates the synchronization information insertion device 10 to instruct the digital transmission line 2
The synchronization information indicating that the synchronization of the wireless channel 2 has been established is inserted into the digital transmission path 2.
移動交換局６の同期情報監視装置122は該情報を検出
すると、移動交換局制御装置13に通知し、通知を受けた
移動交換局制御装置13は、スイッチ３に指示してディジ
タル伝送路１とディジタル伝送路３の接続をディジタル
伝送路１とディジタル伝送路２との接続に切り替える。When the synchronization information monitoring device 12 2 of the mobile switching center 6 detects the information, and notifies the mobile switching center control device 13, the mobile switching center control device 13 having received the notification, the digital transmission line 1 instructs the switch 3 The connection between the digital transmission line 3 and the digital transmission line 3 is switched to the connection between the digital transmission line 1 and the digital transmission line 2.
移動局２は無線チャネル２との同期を確立すると、チ
ャネル切替完了信号を無線チャネル２、基地局72、ディ
ジタル伝送路２を介して移動交換局６に送出し、移動交
換局６が該信号を受信すると、チャネル切替が完了す
る。When the mobile station 2 establishes synchronization with the radio channel 2, channel switching completion signal to the radio channel 2, the base station 7 2, sent to the mobile switching center 6 through the digital transmission path 2, the mobile switching center 6 is the signal Is received, the channel switching is completed.
なお、本実施例では、同一の移動交換局に接続され
る、異なる基地局間での通信中チャネル切替の例を示し
たが、異なる移動交換局に属する基地局間での通信中チ
ャネル切替の場合であっても、移動交換局間で同期情報
を転送することによって、本発明の適用が可能である。
また、同一の基地局の異なる無線チャネル間の通信中チ
ャネル切替に対しても、もちろん適用できる。In the present embodiment, an example of channel switching during communication between different base stations connected to the same mobile switching center has been described, but channel switching during communication between base stations belonging to different mobile switching stations has been described. Even in this case, the present invention can be applied by transferring synchronization information between mobile switching centers.
Further, it is of course applicable to channel switching during communication between different wireless channels of the same base station.
（発明の効果） 以上説明したように、本発明を用いることにより、移
動交換局におけるスイッチ切替を切替後の無線チャネル
（無線チャネル２）の同期確立を契機として瞬時に行な
うことができ、チャネル切替時間、及びチャネル切替に
伴なう瞬断時間を小さくすることができる。又、第３図
に示したチャネル切替支持信号あるいは第７図に示した
チャネル切替指示信号の誤りによって、別の無線チャ
ネルに切り替った場合には、例えば切替先の無線チャネ
ル（無線チャネル２）の同期確立までの時間をタイマ監
視し、タイムアウト時に誤って切り替ったチャネルを介
して、切替元の無線チャネル（無線チャネル１）に戻る
ように指示することにより対処することができる。(Effects of the Invention) As described above, by using the present invention, switch switching in the mobile switching center can be performed instantaneously upon establishment of synchronization of a wireless channel (wireless channel 2) after switching, and channel switching can be performed. Time and instantaneous interruption time associated with channel switching can be reduced. In the case where switching to another wireless channel is performed due to an error in the channel switching support signal shown in FIG. 3 or the channel switching instruction signal shown in FIG. 7, for example, the wireless channel to be switched (wireless channel 2) This can be dealt with by monitoring the time until the synchronization is established by the timer and instructing to return to the switching source wireless channel (wireless channel 1) via the channel that was erroneously switched at the time of timeout.
さらに、本発明を、例えば特願昭62−001599により開
示されているような、バッファにより遅延量を変化させ
て無瞬断チャネル切替を実現するチャネル切替方式に適
用した場合には、同期外れ・同期確立の検出あるいは同
期外れ・同期確立情報の受信に基づいて、バッファ制御
を容易に行なうことが可能となり、バッファ量の削減が
期待できる。Further, when the present invention is applied to a channel switching system that realizes non-instantaneous interruption channel switching by changing the amount of delay by a buffer, as disclosed in Japanese Patent Application No. 62-001599, for example, Buffer control can be easily performed based on detection of synchronization establishment or reception of loss-of-synchronization / synchronization establishment information, and a reduction in buffer amount can be expected.
第１図は本発明を適用した場合のディジタル移動通信シ
ステムの構成例を示す図、第２図は移動制御局1aの構成
例を示す図、第３図は本発明の第２の実施例によるチャ
ネル切替方式を適用したディジタル移動通信方式におけ
る、チャネル切替時のシーケンス例を示す図、第４図は
第２の実施例におけるディジタル移動通信システムの構
成例を示す図、第５図は基地局71,72の構成例を示す
図、第６図は移動交換局６の構成例を示す図、第７図は
第２実施例におけるチャネル切替方式を実施した場合の
チャネル切替シーケンスを示す図、第８図従来のディジ
タル移動通信方式の構成図である。 1,1a……移動制御局、２……移動局、 ３……スイッチ、41,42……同期監視装置、 ５……移動制御局制御装置、 ６……移動交換局、 71,72……無線基地局（基地局）、 ８……送受信装置、９……同期監視装置、 10……同期情報挿入装置、 11……無線基地局制御装置、 121,122……同期情報監視装置、 13……移動交換局制御装置。FIG. 1 is a diagram showing a configuration example of a digital mobile communication system to which the present invention is applied, FIG. 2 is a diagram showing a configuration example of a mobile control station 1a, and FIG. 3 is a diagram showing a second embodiment of the present invention. FIG. 4 is a diagram showing a sequence example at the time of channel switching in a digital mobile communication system to which a channel switching system is applied, FIG. 4 is a diagram showing a configuration example of a digital mobile communication system in a second embodiment, and FIG. 1, 7 shows the second configuration example, FIG. 6 is a diagram showing a configuration example of a mobile switching center 6, FIG. 7 is a diagram showing a channel switching sequence when carrying out the channel switching method in the second embodiment, FIG. 8 is a configuration diagram of a conventional digital mobile communication system. 1, 1a mobile control station, 2 mobile station, 3 switch, 4 1 , 4 2 synchronization monitoring device, 5 mobile control station control device, 6 mobile switching center, 7 1 , 7 2 … Wireless base station (base station) 8… Transceiving device 9… Synchronization monitoring device 10… Synchronization information insertion device 11… Wireless base station controller 12 1 , 12 2 … Synchronization Information monitoring equipment 13 Mobile switching center control equipment
Claims (1)
該移動機とディジタル信号の送受信を行なう少なくとも
ひとつの移動制御局又は移動交換局から構成され、 移動機と移動制御局又は移動交換局が通信中に通信に使
用する無線チャネルを切替える通信中チャネル切替方式
において、 移動制御局又は移動交換局が各無線チャネルの同期監視
装置を具備して切替前後の各無縁チャネルの同期状態を
監視し、 被切替チャネルの同期外れと、切替後のチャネルの同期
確立を契機として、移動制御局又は移動交換局で無線チ
ャネルの切替を行なうことを特徴とする通信中チャネル
切替方式。A mobile station scattered in a plurality of wireless zones,
Communicating channel switching, comprising at least one mobile control station or mobile switching center for transmitting and receiving digital signals to and from the mobile station, and switching a radio channel used for communication between the mobile station and the mobile control station or mobile switching station. In the system, the mobile control station or the mobile switching center is provided with a synchronization monitoring device for each radio channel to monitor the synchronization state of each of the wireless channels before and after switching, and to lose synchronization of the switched channel and establish synchronization of the channel after switching. A switching of a radio channel by a mobile control station or a mobile switching center upon the occasion of the communication channel switching method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63238690A JP2704272B2 (en) | 1988-09-26 | 1988-09-26 | Channel switching method during communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63238690A JP2704272B2 (en) | 1988-09-26 | 1988-09-26 | Channel switching method during communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0287728A JPH0287728A (en) | 1990-03-28 |
| JP2704272B2 true JP2704272B2 (en) | 1998-01-26 |
Family
ID=17033850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63238690A Expired - Lifetime JP2704272B2 (en) | 1988-09-26 | 1988-09-26 | Channel switching method during communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2704272B2 (en) |
-
1988
- 1988-09-26 JP JP63238690A patent/JP2704272B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0287728A (en) | 1990-03-28 |
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