JPS63157533A - Channel switching system - Google Patents
Channel switching systemInfo
- Publication number
- JPS63157533A JPS63157533A JP61305827A JP30582786A JPS63157533A JP S63157533 A JPS63157533 A JP S63157533A JP 61305827 A JP61305827 A JP 61305827A JP 30582786 A JP30582786 A JP 30582786A JP S63157533 A JPS63157533 A JP S63157533A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- channel
- new
- switching
- time
- 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
- 238000004891 communication Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 13
- 238000010295 mobile communication Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 24
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は移動通信方式において移動局がサービスゾー
ン間を移行する際に行う通話中チャネル切換方式≦コ関
するものである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a mid-call channel switching method performed when a mobile station moves between service zones in a mobile communication system.
「従来の技術」
移動通信方式において移動局が交信中の基地局のサービ
スゾーンから他の基地局のサービスゾーンに移行すると
き、その通信を継続するためには交信中の基地間の無線
チャネルを、移行先の基地局の無線チャネルへ切換える
必要がある。``Prior art'' In mobile communication systems, when a mobile station moves from the service zone of the base station it is communicating with to the service zone of another base station, it must change the radio channel between the base stations it is communicating with in order to continue the communication. , it is necessary to switch to the wireless channel of the destination base station.
この切換方式の従来技術を第６図及び第７図を参照して
説・明する。第６図に示すように移動局１１は送信機１
２及び受信機１３により基地局１４とその無線チャネル
を通じて送受信し１通信を行いながら矢印１５方向に移
動している。移動局１１が基地局１４のサービスゾーン
（領域）の境界付近に近ずくと、基地局１４の無線チャ
ネルの通話帯域を通じて移動先のサービスゾーンの基地
局１５と通信するように無線チャネルの切換え指令が与
えられる。すなわち第７図に示すように現在通信中の基
地局１４から移動局１１に対し新チヤネル指定が行われ
る。移動局１１ではこれを受けて切換えに必要な処理を
行う。この処理には送信機１２゜受信８！１３の周波数
の変更と、導通試験とが行われる。The prior art of this switching system will be explained with reference to FIGS. 6 and 7. As shown in FIG.
2 and the receiver 13 transmit and receive data through the base station 14 and its wireless channel, and are moving in the direction of the arrow 15 while performing 1 communication. When the mobile station 11 approaches the boundary of the service zone (area) of the base station 14, a wireless channel switching command is issued to communicate with the base station 15 of the destination service zone through the communication band of the wireless channel of the base station 14. is given. That is, as shown in FIG. 7, a new channel is designated from the base station 14 currently in communication to the mobile station 11. The mobile station 11 receives this and performs the processing necessary for switching. This process involves changing the frequencies of the transmitter 12 and receiver 8!13 and conducting a continuity test.
通話信号がディジタル化されている場合にはタロツク同
期とフレーム同期との確立処理が行われた後、導通試験
が行われる。If the call signal is digitized, a continuity test is performed after establishing tarock synchronization and frame synchronization.
移動局１１は一般に川波数シンセサイザを内蔵し、その
シンセサイザを制御して送受信周波数を可変にしている
。シンセサイザにおける周波数の変更には０．１〜０．
３秒の時間が必要である。導通試験は移行先の無線チャ
ネルにおいて送受信が正常に行われているかどうかを確
認するために欠かせない。確認法は例えば１０１０・・
−・・のパターンを送出して誤りがないかどうかチェッ
クする等の方法が採られる。従来の方式ではこれらの切
換処理に全体で約０．５秒乞要し、この間は通話が中断
するという欠点があった。The mobile station 11 generally has a built-in wave number synthesizer, and controls the synthesizer to vary the transmission and reception frequencies. 0.1 to 0.0 to change the frequency in the synthesizer.
A time of 3 seconds is required. Continuity tests are essential to confirm whether transmission and reception are occurring normally on the new wireless channel. For example, the confirmation method is 1010...
A method is adopted, such as sending out a pattern of -... and checking for errors. In the conventional system, these switching processes require approximately 0.5 seconds in total, and the call is interrupted during this time.
更Ｃニデイジタル方式の場合は、信号の同期を確立する
だめの時間が新た（二必要（二なり１通話断時間はより
長くなる。特にファクシミリやデータ伝送等においては
通話断の期間の情報が完全に欠落してしまうため１通話
断の問題は音声伝送の場合よりも大きい。Furthermore, in the case of the two-digital system, a new time is required to establish signal synchronization. The problem of one call being dropped is greater than in the case of voice transmission.
この発明はこれらの欠点を解決するため、移動機が２つ
の基地局と同時送受信することにより、チャネル切換時
の通話断を解消したチャネル切換方式を提供すること（
−ある。In order to solve these drawbacks, the present invention provides a channel switching method in which a mobile device performs simultaneous transmission and reception with two base stations, thereby eliminating call interruptions during channel switching.
-Yes.
「問題点を解決するための手段」
この発明によればゾーン内？移行するに伴って交信する
基地局を切換える際に、現在交信中の基地局と、５次に
切換える先の基地局との双方と同時（二送受信を行う、
このため（二は例えば２つの周波数チャネル対、又は２
つの時分割チャネルを用い。"Means for Solving Problems" According to this invention, within the zone? When switching the base station to communicate with due to migration, it is possible to simultaneously communicate with both the base station currently communicating and the base station to which the switch is to be made (double transmission and reception).
For this (two is e.g. two frequency channel pairs, or two
using two time-division channels.
その一方のチャネルで現在交信中の基地局と通信し、他
方のチャネルで次に切換える先の基地局と交信する。切
換先の基地局との交信を開始する前（二必要な手順、つ
まり無線導通試験や信号の同期確立などを完了した後（
二通話を途切らすことなく無線チャネルを切換える。One channel is used to communicate with the base station currently in communication, and the other channel is used to communicate with the next base station. Before starting communication with the target base station (after completing the necessary steps, such as radio continuity tests and establishing signal synchronization)
To switch wireless channels without interrupting two calls.
「実施例」
第１図はこの発明の実施例を示し、この例では移動局１
１に、送信Ｎ１２ａ、受信機１３ａと。"Embodiment" FIG. 1 shows an embodiment of the present invention, in which a mobile station 1
1, a transmitter N12a and a receiver 13a.
送信Ｎ１２ｂ、受信ｍ１３ｂとの２系統を設けた場合で
ある。第４図（二示すように移動局１１は旧基地局１４
と送信機１２ａ、受信機１３ａで交信しているとする。This is a case where two systems, a transmission N12b and a reception m13b, are provided. As shown in Figure 4 (2), the mobile station 11 is located at the old base station 14.
It is assumed that the transmitter 12a and the receiver 13a are communicating with each other.
無線ゾーン間の移行（二伴ってチャネル切換えがスター
トすると、その旧基地局１４との通話に利用している無
線チャネル（二おけるインサービス制御信号により先ず
新無線チャネルの周波数が指定される。通話は一般Ｃ二
３００ Ｈｚ〜３ＫＨｚの周波数帯で行われ、３００Ｈ
ｚＢ下の周波数帯を用いて１００ ｂ／ｓ程度のディジ
タル信号を用いて各種の制御清報の伝送が行われる。こ
の制御清報はインサービス制御信号と呼ばれている。When channel switching starts with transition between wireless zones (2), the frequency of the new wireless channel is first designated by an in-service control signal (2) of the wireless channel used for the call with the old base station 14. is generally carried out in the frequency band of 300 Hz to 3KHz, and 300H
Various control messages are transmitted using digital signals of about 100 b/s using a frequency band below zB. This control information is called an in-service control signal.
前述したよう（二このインサービス制御信号により新無
線チャネルの周波数が指定されると、それまで動作して
いなかった送信機１２ｂ、受信機１３ｂがこの指定され
た周波数で始動する。同時に移行先の基地局１５の該当
する送受信装置も始動する。これは無線基地局の上位局
である制御局からの指令（二より行われる。新通話チャ
ネルの導通試験が先ず新基地局発移動局受けで始まり（
下り導通試験）、移動局１１側で試験信号が受かったこ
とが確認されると１次に移動局発基地局受けで試験信号
が送られる（上り導通試験）。親基地局１５がその試験
信号の受信を確認すると導通試験は完了する。もし通話
信号がディジタル形式の場合には導通試験に先立って上
り及び下り回線のクロック同期、フレーム同期を確立す
る（同期確立）。以上により移動局１１は新、旧両基地
荀１４゜１５と同時に交信２行っている状態となる。最
後（二連話自体を旧チャネルから新チャネルへ切換える
と全てのチャネル切換動作は通話断がなく完了する。As mentioned above (2) When the frequency of a new wireless channel is specified by this in-service control signal, the transmitter 12b and receiver 13b, which were not operating until then, start up at this specified frequency. The corresponding transmitting/receiving device of the base station 15 is also started.This is carried out from the command (2) from the control station, which is the upper station of the wireless base station.The continuity test of the new communication channel starts from the new base station to the mobile station reception. (
When it is confirmed that the test signal has been received on the mobile station 11 side, a test signal is sent from the mobile station to the base station receiver (uplink continuity test). When the parent base station 15 confirms reception of the test signal, the continuity test is completed. If the call signal is in a digital format, clock synchronization and frame synchronization of uplink and downlink channels are established prior to the continuity test (synchronization establishment). As a result of the above, the mobile station 11 is in a state where it is simultaneously conducting two communications with both the new and old base stations 14 and 15. Finally (when the double-talk itself is switched from the old channel to the new channel, all channel switching operations are completed without call interruption.
ディジタル方式の場合にはフレームとフレームの境でチ
ャネルを切換えれば無瞬断がより確実なものとなる。な
お旧基地局１４と親基地局１５との信号間に時間遅延差
がある場合には基地局１５又は移動局１１で遅延を合わ
せることも考慮する必要がある。In the case of digital systems, switching channels at the boundaries between frames will ensure no interruptions. Note that if there is a time delay difference between the signals of the old base station 14 and the parent base station 15, it is also necessary to consider matching the delays at the base station 15 or mobile station 11.
第３図は伝送方式が２チヤネルの時分割の場合に、移動
′８１１に一系統のみの送受信８！ヲ用いる場合に、無
瞬断切換を行うフローを示したものである。通常は基地
局は複数の移動局と同−周波数で時分割に通話している
。第３図は時分割通話路（チャネル）が１ ｃｈと２Ｃ
ｈとの２つの場合では基地局１４と移動局１１はチャネ
ル１ ｃｈを通じて通信している場合のみを示している
。ディジタル伝送ではインサービス制御信号は、１フレ
ームの中で、例えば音声信号の後に配置される。この場
合の装置構成は第６図の場合と同様に送信機と受信機と
は１組のみである。新基地局との交信は第２図の場合と
同じく旧基地局１４との交信中のインサービス制御信号
によって新開波数が指定され、所定の処理の後に行われ
る。この周波数指定清報が上位の制＠局から新基地局１
５に送られて新基地局も始動する。新基地局との交信号
は指定された無線チャネル（周波数）と、指定された時
分割チャネルで行われるが、この例ではチャネル２ｃｈ
’４通じて行われる。このチャネル２Ｃｈで送受信する
時は、シソセサイザを制御して移動局１１の送信機１２
、受信機１３を指定された無線チャネルにセットする。FIG. 3 shows that when the transmission method is two-channel time division, only one transmission/reception system is used for the movement '811. This figure shows the flow for performing uninterrupted switching when using . Normally, a base station communicates with multiple mobile stations on the same frequency in a time-division manner. In Figure 3, the time division communication paths (channels) are 1ch and 2C.
In the two cases h and 1, only the case where the base station 14 and mobile station 11 are communicating through channel 1ch is shown. In digital transmission, the in-service control signal is placed within one frame, for example after the audio signal. The device configuration in this case is the same as the case in FIG. 6, with only one set of transmitter and receiver. Communication with the new base station is performed after predetermined processing, with the new wave number designated by an in-service control signal during communication with the old base station 14, as in the case of FIG. This frequency specification report is sent from the upper control @ station to the new base station 1.
5 and the new base station will also start up. The exchange signal with the new base station is carried out on the specified radio channel (frequency) and the specified time division channel, but in this example, channel 2ch is used.
It will be held throughout '4. When transmitting and receiving on this channel 2Ch, the transmitter 12 of the mobile station 11 controls the synthesizer.
, sets the receiver 13 to the specified wireless channel.
このようにして移動局１１はチャネルｌｃｈを通じて旧
１層基・・地、局１４と交信をしながら、チャネル２ｃ
ｈ：２通じて新基地局１５との同期確立、導通試験を行
うことができ、その試験の後に、新基地局１５とのみの
交信に切替える。In this way, the mobile station 11 communicates with the old 1st layer base station 14 through the channel lch, while communicating with the station 14 on the channel 2c.
h:2, it is possible to establish synchronization with the new base station 15 and perform a continuity test, and after the test, communication is switched to only with the new base station 15.
この例では移動局１１では基地局１４との間欠的°な送
受信が、切換操作中は基地局１４．１５の両者との連続
的送受信となる。この際にガードタイムスロットを減ら
すため、旧基地局１４との無線チャネルと、新基地局１
５との無線チャネルとの高速切換が必要となる。この高
速周波数切換は周波数シンセサイザを２台用意する等の
方法で達成できる。第３図（−示すように、移動局１１
ではチャネル切換が行われると通話時間がフレーム単位
でずれる。このままでは相手側（二対して時間遅延が生
じる。従ってシステムでその遅延を補正する機能が必要
となる。インサービス制御信号の代り（二制御チャネル
を利用して新チャネルの周波数及びチャネル切換動作の
スタート指示を行うこともできる。移動局が２系統の送
受信機を一用いる場合には非交信中の送受信機が常時制
御チャネルを受信すればよい。時分割伝送方式で送受信
機が一系統の場合には送受信の空き時間に制御チャネル
を受信する。つまり移動局で通話に割当てられた時間チ
ャネル以外の時間の特定のタイムスロットを制御チャネ
ルとすることができる。制御チャネルはすべての移動局
で共通だから、このタイムスロットではすべての移動局
で受信できる。このタイムスロットを利用して新チヤネ
ル情報を送ることができる。つまりインサービス制御信
号を用いる場合は、通話チャネル（−該当する時間内を
利用してチャネルｉｓ報を送るが、制御チャネルを用い
る場合は、別のタイムスロットを用いるという点が異な
るが、どちら（ニしても通話信号がない時間帯に新チヤ
ネル清報を送ることには変わりはない。In this example, the mobile station 11 performs intermittent transmission and reception with the base station 14, but continuously transmits and receives with both base stations 14 and 15 during the switching operation. At this time, in order to reduce the number of guard time slots, the wireless channel with the old base station 14 and the new base station 1
5 and wireless channels are required. This high-speed frequency switching can be achieved by a method such as preparing two frequency synthesizers. FIG. 3 (- As shown, the mobile station 11
In this case, when a channel is switched, the call time shifts by frames. If this continues, a time delay will occur between the other party and the other party. Therefore, the system will need a function to compensate for this delay. It is also possible to give a start instruction.If the mobile station uses one transceiver with two systems, the transceiver that is not communicating only needs to receive the control channel at all times.If the mobile station uses one system of transceivers in a time division transmission method The control channel is received during idle time for transmission and reception.In other words, the control channel can be a specific time slot other than the time channel assigned to the mobile station for calls.The control channel is common to all mobile stations. Therefore, all mobile stations can receive this time slot. This time slot can be used to send new channel information. In other words, when using in-service control signals, the communication channel (-- However, when using the control channel, a different time slot is used. There is no difference.
以上の説明は２ｙ−ヤネルの時分割について述べたもの
であるが、３チヤネル以上の時分割の場合にもこの発明
を適用できることは勿論可能である。Although the above description has been made regarding time division of 2y-channels, it is of course possible to apply the present invention to the case of time division of three or more channels.
また２チヤネルの時分割方式で送信と受信が時間的に重
ならないように相補的に行ういわゆるビンボン方式の場
合においても、この発明を適用できる。ビンボン伝送は
送信と受信とを交互に行うものであり、また送信周波数
と、受信周波数とが異ならされている。この方式にこの
発明を適用した流れ図を第４図（：示す。移動局が旧基
地局１４とビンボン伝送方式で伝送している間に、イン
サービス制御信号にて新チヤネル指定が行われると。Further, the present invention can also be applied to a so-called Bing-Bong method in which transmission and reception are performed in a complementary manner so that they do not overlap in time in a two-channel time division method. Bing Bong transmission alternates transmission and reception, and the transmission frequency and reception frequency are different. A flowchart in which the present invention is applied to this system is shown in FIG.
これと同時に上位の制御局から次の新基地局１５も移動
局と新しく指定された無線チャネルでビンボン伝送を開
始する。図示例では移動局が旧基地局１４に対し、旧無
線チャネルで送信状態（：ある時、新基地局１５から新
無線チャネルで同期確立のための送信が行われる。旧無
線チャネルＣ二より移動局が旧基地局１４から受信状態
になると移動局は新無線チャネルで新基地局１５へ送信
状態となる。このようにして新基地局との同期確立、導
通試験が終了すると、旧基地局１４との交信号を止めて
新基地局１５との交信状態に切換える。At the same time, the next new base station 15 from the upper control station also starts Bing Bong transmission with the mobile station on the newly designated radio channel. In the illustrated example, the mobile station is transmitting to the old base station 14 on the old radio channel (: At some point, the new base station 15 transmits on the new radio channel to establish synchronization. The mobile station moves from the old radio channel C2. When the mobile station enters the receiving state from the old base station 14, the mobile station enters the transmitting state using the new radio channel to the new base station 15.In this way, when synchronization with the new base station is established and the continuity test is completed, the mobile station The communication signal with the new base station 15 is stopped and the communication state is switched to the new base station 15.
第５図は信号中（二時間ダイバーンチブランチが組込ま
れたものにこの発明を適用した例である。FIG. 5 is an example in which the present invention is applied to a signal system (in which a two-hour divert branch is incorporated).
この実施例では２ブランチの場合である。図中の記号■
、■は時間グイバーンテのブランチ番号を示したもので
ある。但し必ずしも隣接するフレームがダイバーシチブ
ランチになる訳でなく、一般にはフェージングの相関が
十分に低い時間間隔をあけてブランチ■と■とが配置さ
れる。通常の交信時（；はこの時間ダイバーンチを適用
し高品質な送受信を行うが、チャネル切換時にはブラン
チの１つ（この例ではブランチ■）の送受信を停止して
移行先の新基地局１５の無線チャネルのブランチ■との
交信を開始し、導通試験並びに同期確立を図る。チャネ
ル切換中は時間ダイバーンチ効果がなくなる分級送品質
が低下するが１通話が途切れることはない。In this embodiment, there are two branches. Symbols in the diagram ■
, ■ indicates the branch number of the time guidance. However, adjacent frames do not necessarily become diversity branches, and in general, branches (2) and (2) are arranged at a time interval where the fading correlation is sufficiently low. During normal communication (; means that high-quality transmission and reception is performed by applying divergence during this time, but when switching channels, transmission and reception of one of the branches (in this example, branch Communication with channel branch (■) is started, and a continuity test and synchronization are established.During channel switching, the time divergence effect disappears and the quality of classified transmission deteriorates, but one call is not interrupted.
「発明の効果」
以上説明したようにこの発明によれば、移動局がサービ
スエリア間を移行するときのチャネル切換時に通話の途
切れることがなくなるため、通話品質は向上し、特（ニ
ファクシミリやデータ伝送において大きな効果がある。"Effects of the Invention" As explained above, according to the present invention, the call quality is improved because there is no interruption in the call when switching channels when the mobile station moves between service areas. This has a great effect on transmission.
移動通信において加入者容量を増大させる一手段として
ゾーン半径の縮小が挙げられるが、その問題点としてチ
ャネル切換の頻度が高まることがある。この発明は今後
の加入者容量の増大に対して一層有効となる。One way to increase subscriber capacity in mobile communications is to reduce the zone radius, but a problem with this is that it increases the frequency of channel switching. This invention will be even more effective for future increases in subscriber capacity.
【図面の簡単な説明】
第１図はこの発明のうち移動局が２系統の送受信機を有
している場合の構成を示す図、第２図は移動局が２系統
の送受信機を有している場合のチャネル切換の動作流れ
を示す図、第３図は時分割伝送により送受信機が１系統
のみとした場合のチャネル切換の動作流れを示す図、第
４図はピンポン伝送方式の場合のチャネル切換の動作流
れ乞示す図、第５図は時間ダイバーシテを適用した方式
におけるチャネル切換フローの動作流れを示す図、第６
図は従来の移動局が１系統の送受信機の場合の構成を示
す図、第７図は従来のチャネル切換の動作流れを示す図
である。[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a diagram showing the configuration of the present invention in which a mobile station has two systems of transceivers, and Fig. 2 shows a configuration in which a mobile station has two systems of transceivers. Figure 3 is a diagram showing the flow of channel switching when using time-division transmission with only one transmitter/receiver system, and Figure 4 is a diagram showing the flow of channel switching when using ping-pong transmission. FIG. 5 is a diagram showing the operational flow of channel switching, and FIG. 5 is a diagram showing the operational flow of channel switching in a method applying time diversity.
This figure shows the configuration of a conventional mobile station having one system of transmitter/receiver, and FIG. 7 is a diagram showing the operational flow of conventional channel switching.
Claims (1)
方式において、 ゾーン間を移行するに伴って交信する基地局を切換える
際に、現在交信中の基地局と次に切換える先の基地局と
の双方と同時に送受信を行い、 切換先の基地局との交信を開始する前に必要な手順であ
る無線導通試験及び信号の同期の確立等を完了した後に
、通話を途切らすことなく無線チャネルを切換えること
を特徴とするチャネル切換方式。(1) In a mobile communication system that forms a service area in multiple zones, when switching base stations to communicate with when moving between zones, the difference between the currently communicating base station and the next base station to switch to is Both sides transmit and receive at the same time, and after completing the necessary steps such as wireless continuity tests and establishing signal synchronization before starting communication with the switching destination base station, the wireless channel is switched without interrupting the call. A channel switching method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61305827A JPH082117B2 (en) | 1986-12-22 | 1986-12-22 | Channel switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61305827A JPH082117B2 (en) | 1986-12-22 | 1986-12-22 | Channel switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63157533A true JPS63157533A (en) | 1988-06-30 |
| JPH082117B2 JPH082117B2 (en) | 1996-01-10 |
Family
ID=17949849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61305827A Expired - Lifetime JPH082117B2 (en) | 1986-12-22 | 1986-12-22 | Channel switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH082117B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0430106A2 (en) * | 1989-11-24 | 1991-06-05 | Nippon Telegraph And Telephone Corporation | Radio communication equipment for a mobile station and traffic channel hand-off method using the same |
| JPH03214890A (en) * | 1989-11-24 | 1991-09-20 | Nippon Telegr & Teleph Corp <Ntt> | Radio communicating equipment for mobile station and switching method for communication channel using same |
| JPH05235846A (en) * | 1992-02-25 | 1993-09-10 | Nec Corp | Radio telephone system |
| JPH0670374A (en) * | 1992-05-18 | 1994-03-11 | American Teleph & Telegr Co <Att> | Method and apparatus for handing-over of cellular mobile communication |
| JPH0670373A (en) * | 1991-11-27 | 1994-03-11 | American Teleph & Telegr Co <Att> | Method and apparatus for handing-over of cellular mobile communication |
| JPH06253364A (en) * | 1991-07-09 | 1994-09-09 | American Teleph & Telegr Co <Att> | Radio access communication system and method of transmitting call traffic |
| JPH0730949A (en) * | 1993-07-14 | 1995-01-31 | Nec Corp | Talking state cannel changeover method and system in mobile communications |
| JP2013115586A (en) * | 2011-11-28 | 2013-06-10 | Kyocera Corp | Radio communication device and radio communication device control method |
-
1986
- 1986-12-22 JP JP61305827A patent/JPH082117B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0430106A2 (en) * | 1989-11-24 | 1991-06-05 | Nippon Telegraph And Telephone Corporation | Radio communication equipment for a mobile station and traffic channel hand-off method using the same |
| JPH03214890A (en) * | 1989-11-24 | 1991-09-20 | Nippon Telegr & Teleph Corp <Ntt> | Radio communicating equipment for mobile station and switching method for communication channel using same |
| US5231632A (en) * | 1989-11-24 | 1993-07-27 | Nippon Telegraph And Telephone Corporation | Radio communication equipment for a mobile station and traffic channel hand-off method using the same |
| JPH06253364A (en) * | 1991-07-09 | 1994-09-09 | American Teleph & Telegr Co <Att> | Radio access communication system and method of transmitting call traffic |
| JPH0670373A (en) * | 1991-11-27 | 1994-03-11 | American Teleph & Telegr Co <Att> | Method and apparatus for handing-over of cellular mobile communication |
| JPH05235846A (en) * | 1992-02-25 | 1993-09-10 | Nec Corp | Radio telephone system |
| JPH0670374A (en) * | 1992-05-18 | 1994-03-11 | American Teleph & Telegr Co <Att> | Method and apparatus for handing-over of cellular mobile communication |
| JPH0730949A (en) * | 1993-07-14 | 1995-01-31 | Nec Corp | Talking state cannel changeover method and system in mobile communications |
| JP2013115586A (en) * | 2011-11-28 | 2013-06-10 | Kyocera Corp | Radio communication device and radio communication device control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH082117B2 (en) | 1996-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |