JPH0645990A - Mobile terminal - Google Patents

Mobile terminal

Info

Publication number
JPH0645990A
JPH0645990A JP4061613A JP6161392A JPH0645990A JP H0645990 A JPH0645990 A JP H0645990A JP 4061613 A JP4061613 A JP 4061613A JP 6161392 A JP6161392 A JP 6161392A JP H0645990 A JPH0645990 A JP H0645990A
Authority
JP
Japan
Prior art keywords
communication
mobile terminal
base station
reception
communication channel
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.)
Pending
Application number
JP4061613A
Other languages
Japanese (ja)
Inventor
Yoichi Oteru
洋一 大照
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP4061613A priority Critical patent/JPH0645990A/en
Publication of JPH0645990A publication Critical patent/JPH0645990A/en
Pending legal-status Critical Current

Links

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To improve the communication quality of a mobile terminal while moving, which communicates with plural base stations, and operates the communication by an encoded voice signal, accompanied with the movement in a communication. CONSTITUTION:When a reception level value R1 becomes less than a normal value H1 while a mobile terminal 10 operates the communication through a base station 21, the communication channel is maintained, and a base station 22 whose reception level value R2 is the maximum is selected. Then, the communication channel through the base station 22 is constituted with double- connection with a trunk circuit 33 in constituting a communication path by an exchange control station 30. When either of the two level values R1 and R2 exceeds the other normal value H2 (H2>H1), a means which release one of the double communication paths releases the communication channel whose level value is smaller as the end of the communication. Therefore, the mobile terminal simultaneously operates the communication through the communication channels with the two different base stations, so that even when an abnormal level drop or instantaneous interruption is generated at one base station, the communication can be saved by the other base station.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、移動しつつ複数の無線
基地局と交信してディジタル符号化音声信号で通信する
移動端末に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal which, while moving, communicates with a plurality of radio base stations to communicate with digitally encoded voice signals.

【0002】[0002]

【従来の技術】従来、この種の移動端末は、一つの無線
基地局と移動しつつ交信中、この無線基地局から新しい
通話チャネル番号と切換指令を受けて近くの無線基地局
の新通話チャネルに切換え、通話を継続する。
2. Description of the Related Art Conventionally, a mobile terminal of this type is communicating with one radio base station while communicating, and receives a new call channel number and a switching command from the radio base station to receive a new call channel of a nearby radio base station. Switch to and continue the call.

【0003】これについて図8を参照して説明する。図
8は従来の一例を示すブロック構成図である。
This will be described with reference to FIG. FIG. 8 is a block diagram showing a conventional example.

【0004】図示する移動端末80は無線基地局81〜
83と無線電波で交信できる。無線基地局81〜83は
交換制御局90のスイッチ91に通話チャネルが収容接
続され、信号線で制御信号が授受される。
The mobile terminal 80 shown in FIG.
You can communicate with 83 by radio wave. The radio base stations 81 to 83 are connected to the switch 91 of the exchange control station 90 for a communication channel, and control signals are transmitted and received through signal lines.

【0005】交換制御局90はスイッチ91を制御して
無線基地局81〜83の一つの通話チャネルを中継回線
92の一つに接続する。
The switching control station 90 controls the switch 91 to connect one speech channel of the radio base stations 81 to 83 to one of the relay lines 92.

【0006】次に、通話中チャネルの切換手順と共に、
各機能ブロックの機能について説明する。
[0006] Next, together with the procedure for switching the busy channel,
The function of each functional block will be described.

【0007】まず、移動端末80は無線基地局81経由
でスイッチ91を介して中継回線92に通話路を形成し
通話中である。
First, the mobile terminal 80 is in a call by forming a call path on the relay line 92 via the switch 91 via the radio base station 81.

【0008】移動端末80が移動して無線基地局81か
ら離れたとき、無線基地局81は移動端末80からの受
信レベルが規定値以下になるので、これを交換制御局9
0へ通知する。
When the mobile terminal 80 moves away from the radio base station 81, the reception level from the mobile terminal 80 of the radio base station 81 falls below a specified value.
Notify 0.

【0009】交換制御局90は無線基地局81の隣接無
線基地局(例えば)82,83へ通話チャネル番号を通
知して受信レベル測定を指示する。従って、無線基地局
82,83は受信レベルの測定結果を交換制御局90へ
報告する。
The switching control station 90 notifies the adjacent radio base stations (for example) 82 and 83 of the radio base station 81 of the call channel number and instructs the measurement of the reception level. Therefore, the radio base stations 82 and 83 report the measurement result of the reception level to the exchange control station 90.

【0010】交換制御局はこの報告に従って最高の受信
レベルの無線基地局(例えば)82を選び、新しい通話
チャネル番号を指示する。従って、無線基地局82は新
しい通話チャネルの無線機を駆動する。
According to this report, the switching control station selects the radio base station (for example) 82 having the highest reception level and indicates the new communication channel number. Therefore, the radio base station 82 drives the radio of the new communication channel.

【0011】交換制御局90は無線基地局81に移動端
末への切換指令を出すので、無線基地局81は移動端末
80へ通話中チャネル経由新しい通話チャネル番号およ
び切替指令を通達する。従って、移動端末80は指令さ
れた通話チャネルに切換える。
Since the exchange control station 90 issues a switching command to the wireless base station 81 to the mobile terminal, the wireless base station 81 notifies the mobile terminal 80 of a new communication channel number and a switching command via the busy channel. Therefore, the mobile terminal 80 switches to the commanded communication channel.

【0012】無線基地局82は新しくら切換えられた通
話チャネルの受信レベルが規定値以上になったことで切
替完了を知り交換制御局90へこれを通知する。
The radio base station 82 knows that the switching has been completed because the reception level of the newly switched communication channel has exceeded the specified value, and notifies the exchange control station 90 of this.

【0013】この通知を受信して、交換制御局90はス
イッチ90を駆動し、中継回線92との通話チャネルの
接続を、無線基地局81から無線基地局82へ切換え
る。
Upon receipt of this notification, the exchange control station 90 drives the switch 90 to switch the connection of the communication channel with the trunk line 92 from the radio base station 81 to the radio base station 82.

【0014】この無線基地局の切換制御はハンドオフと
呼ばれている。
The switching control of the radio base station is called handoff.

【0015】[0015]

【発明が解決しようとする課題】上述の従来の移動端末
は、移動による通話チャネルの切換えを交換制御局の制
御によるうえ、移動端末が通話チャネルを切換えたのち
交換制御局がスイッチを切換完了するまでのハンドオフ
による数十ミリ秒程度の瞬断が生じるので、通話品質を
低下させると共に、無線基地局の通信領域の境界付近で
移動するとき生じるハンドオフの回数増が交換制御局の
処理負担増となるという問題点があった。
In the conventional mobile terminal described above, the switching control station controls the switching of the communication channel due to movement, and the switching control station completes the switching after the mobile terminal switches the communication channel. Up to several tens of milliseconds due to handoffs, the call quality is degraded, and the increase in the number of handoffs when moving near the boundary of the communication area of the wireless base station increases the processing load on the switching control station. There was a problem that

【0016】また、障害物の影響により電波が遮られて
生じるシャドウィング、および複数の反射波の合成で生
じる空間的な定在波の中を移動して横切るとき生じるフ
ェージングは、移動端末の微少な移動でも受信レベルが
変化するため上述のような従来の方式では対応するのが
不可能であった。
[0016] Further, shadowing that occurs when radio waves are blocked by the influence of obstacles and fading that occurs when moving and crossing a spatial standing wave produced by the synthesis of a plurality of reflected waves are small in the mobile terminal. It is impossible to deal with the above-mentioned conventional methods because the reception level changes even when the movement is large.

【0017】本発明の目的は、移動端末が通信チャネル
での受信レベルが規定値以下になったとき別の高レベル
の通信チャネルを選択して交換制御局に通知し、二重の
通信チャネルで通話することにより、上記問題点を解決
する移動端末を提供することにある。
It is an object of the present invention to select another high level communication channel when the reception level on the communication channel falls below a specified value and notify the switching control station of the mobile terminal by using the dual communication channel. An object of the present invention is to provide a mobile terminal that solves the above problems by making a call.

【0018】[0018]

【課題を解決するための手段】本発明による移動端末の
基本構成は、移動しつつ複数の無線基地局と交信してデ
ィジタル符号化音声信号で通信する移動端末に関する。
一つの通信チャンネルを設定して通信中の電波の受信レ
ベルR1が所定のしきい値H1より小さくなったとき、
他の最大の受信レベルR2をもつ電波の一つの通信チャ
ネルを選択して通信中の通信チャネルと同時に送受信す
る送受信手段を有する。
The basic configuration of a mobile terminal according to the present invention relates to a mobile terminal which communicates with a plurality of radio base stations while moving by communicating with digitally encoded voice signals.
When the reception level R1 of the radio wave during communication when one communication channel is set becomes smaller than the predetermined threshold value H1,
It has a transmitting / receiving means for selecting one communication channel of the radio wave having the other maximum reception level R2 and transmitting / receiving simultaneously with the communication channel in communication.

【0019】前記基本構成の第1の具体化構成は、送受
信手段が、二つの受信レベルR1・R2の何れか一方が
所定の別のしきい値H2(>H1)より大きくなったと
き、小さい方の受信レベルをもつ電波の通信チャネルの
通信を終了する。
The first specific configuration of the basic configuration is small when the transmitting / receiving means has one of the two reception levels R1 and R2 larger than another predetermined threshold value H2 (> H1). The communication of the communication channel of the radio wave having the reception level of one is terminated.

【0020】前記基本構成の第2の具体化構成は、前記
送受信手段が二つの通信チャネルで同時に通信すると
き、二つの受信チャネルの符号化音声信号をそれぞれ復
号化する復号化器と、この復号化器から出力する二つの
アナログ音声信号を入力して合成し出力する加算器とを
有する。
A second specific configuration of the basic configuration is a decoder for respectively decoding encoded voice signals of two receiving channels when the transmitting / receiving means simultaneously communicates on two communication channels, and this decoding. And an adder for inputting, synthesizing and outputting two analog audio signals output from the digitizer.

【0021】また、第3の具体化構成は、前記送受信手
段が二つの通信チャネルで同時に通信するとき、二つの
受信チャネルの符号化音声信号それぞれの、同一周期内
に受信した受信データの受信レベルを比較し、大きい方
の信号だけを出力する比較器と、この比較器が出力する
符号化音声信号を入力して復号化したアナログ音声信号
を出力する復号化器とを有する。
Further, in the third embodiment, when the transmitting / receiving means simultaneously communicates in two communication channels, the reception level of the reception data of the encoded audio signals of the two reception channels received in the same cycle. And a decoder that outputs only the larger signal and a decoder that inputs the coded voice signal output from this comparator and outputs a decoded analog voice signal.

【0022】[0022]

【作用】上述の手段によるば、境界領域などで無線基地
局との通信チャネルが低レベルまたは瞬断になっても二
重化された他方の通信チャネルは通話できるので通話チ
ャネル切換での瞬断および遅延がなく、かつシャドウィ
ングおよびフェージングによる通信品質の劣化が回避で
きる。
According to the above-mentioned means, even if the communication channel with the radio base station is at a low level or is momentarily cut off in the boundary area or the like, the other communication channel that is duplicated can make a call, so that there is a momentary cutoff and delay in switching the communication channel. In addition, deterioration of communication quality due to shadowing and fading can be avoided.

【0023】[0023]

【実施例】次に、本発明について図面を説明する。図1
は本発明の一実施例を示す流れ図、また図2は本発明に
よる一例を示す中継方式図である。図1に図2を併せ参
照して本発明による主要手順について説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. Figure 1
Is a flow chart showing an embodiment of the present invention, and FIG. 2 is a relay system diagram showing an example of the present invention. The main procedure according to the present invention will be described with reference to FIG. 1 and FIG.

【0024】まず、図2において、移動端末10は無線
基地局21〜23それぞれが受持つ領域を移動し、無線
電波による通信チャネルを形成して通信する。無線基地
局21〜23は交換制御局30のスイッチ31に収容接
続される。
First, in FIG. 2, the mobile terminal 10 moves in the area covered by each of the radio base stations 21 to 23, forms a communication channel by radio waves, and performs communication. The radio base stations 21 to 23 are accommodated and connected to the switch 31 of the exchange control station 30.

【0025】交換制御局30は、無線基地局21〜23
以外に、合成・分岐トランク32および中継回線33を
スイッチ31に収容し、スイッチ31を駆動して収容す
る回線の相互接続を制御する。
The switching control station 30 includes the radio base stations 21 to 23.
Besides, the composite / branch trunk 32 and the relay line 33 are accommodated in the switch 31, and the switch 31 is driven to control the interconnection of the accommodated lines.

【0026】ここで、移動端末10は無線基地局21か
らスイッチ31を介して中継回線33と通信路を形成
し、通信中とする。
Here, the mobile terminal 10 forms a communication path with the relay line 33 from the radio base station 21 via the switch 31 and is in communication.

【0027】図1に示すように、移動端末10は無線基
地局21から受信する通信チャネルの電波の受信レベル
値R1を検出(101)し、一つのしきい値である規定
値H1と比較する。
As shown in FIG. 1, the mobile terminal 10 detects (101) the reception level value R1 of the radio wave of the communication channel received from the radio base station 21 and compares it with a prescribed value H1 which is one threshold value. .

【0028】受信レベル値R1が規定値H1以下であっ
た(102)とき、他局、すなわち無線基地局22,2
3が発信する電波の受信レベルを計測(103)した移
動端末10は、これら計測値の中で最大レベル値R2を
もつ電波の一つの発信無線基地局(例えば)22を選択
し、新しい通信チャンネルを設定して交換制御局30に
通知し、通信を開始(104)する。
When the reception level value R1 is less than the specified value H1 (102), another station, that is, the radio base stations 22, 2
The mobile terminal 10 that has measured (103) the reception level of the radio wave transmitted by the wireless communication terminal 3 selects one transmission radio base station (for example) 22 of the radio wave having the maximum level value R2 among these measured values, and selects a new communication channel. Is set to notify the exchange control station 30, and communication is started (104).

【0029】手順104で、交換制御局30は、無線基
地局21と中継回線33との接続を、スイッチ31を介
して、無線基地局21,22および中継回線33を合成
・分岐トランク32の接続に変更し、合成・分岐トラン
ク32が無線基地局21,22のそれぞれの中継回線3
3に二重接続する。従って移動端末10は無線基地局2
1,22の両局を介する二重の通信チャネルによる重複
送受信状態になる。
In step 104, the switching control station 30 connects the wireless base station 21 and the relay line 33 to the wireless base stations 21 and 22 and the relay line 33 via the switch 31 and connects the branch trunk 32. To the trunk line 3 of each of the wireless base stations 21 and 22.
Double connect to 3. Therefore, the mobile terminal 10 is
The duplicate transmission / reception state by the dual communication channel through both the stations 1 and 22 is set.

【0030】このことは、一方の無線電波がシャドウィ
ングまたウェージングにより極端に低レベルまたは瞬断
があっても他方は通常影響されないので、通信品質の低
下を避けることができる。従って、この状態は無線電波
の一方が安定受信するまで接続される。
This means that even if one radio wave has an extremely low level or a momentary interruption due to shadowing or wading, the other is not usually affected, so that deterioration of communication quality can be avoided. Therefore, this state is connected until one of the radio waves is stably received.

【0031】この状態で、移動端末10は通信チャネル
を形成する二つの電波の受信レベル値R1,R2を検出
(105)し、レベル値R1,R2の何れか一方が規定
値H1より大きいしきい値となる規定値H2を超えたと
き、大きい方のレベル値(例えば)R2をもつ通信チャ
ネルを残し、小さい方のレベル値R1をもつ通信チャネ
ルを通信終了(107)の処理とする。
In this state, the mobile terminal 10 detects the reception level values R1 and R2 of the two radio waves forming the communication channel (105), and one of the level values R1 and R2 is greater than the threshold value H1. When the specified value H2, which is a value, is exceeded, the communication channel having the larger level value (for example) R2 is left, and the communication channel having the smaller level value R1 is processed to terminate the communication (107).

【0032】このように、通信チャネルの切換制御を移
動端末が指示するので、手順107での通信終了は、例
えば十分な受信レベル値をもつ、残される通信チャネル
を介し、移動端末が無線基地局経由で交換制御局または
合成・分岐トランクに切換完了を通知することがよい。
As described above, since the mobile terminal instructs the switching control of the communication channel, the termination of the communication in step 107 is performed by the mobile terminal via the remaining communication channel having a sufficient reception level value. It is advisable to notify the switching control station or the combining / branching trunk of the completion of switching through the route.

【0033】図3は図1の手順によって交換制御局30
が制御するスイッチ31の接続状態変化の一例を示す接
続状態図である。図3の構成要素は図2と同一で同一番
号符号を付与した。
FIG. 3 shows the switching control station 30 according to the procedure of FIG.
FIG. 6 is a connection state diagram showing an example of a change in connection state of the switch 31 controlled by. The components in FIG. 3 are the same as those in FIG. 2 and are assigned the same reference numerals.

【0034】図3に示す例では、図1の手順102で受
信レベル値R1が規定値H1以下になったことを検出し
たとき、図3(1)に示すように、無線基地局21から
の通信路および中継回線33をスイッチ31を介して合
成・分岐トランク32に重複接続したのち図2に示すス
イッチ31の直結路を切断し、図3(2)の状態にす
る。
In the example shown in FIG. 3, when it is detected in step 102 of FIG. 1 that the reception level value R1 has become equal to or less than the specified value H1, as shown in FIG. After the communication path and the relay line 33 are connected to the combining / branching trunk 32 via the switch 31, the direct connection path of the switch 31 shown in FIG. 2 is cut off, and the state of FIG.

【0035】次に、図1の手順104で、通信中の無線
基地局21を介して移動端末10から新しい通信チャネ
ルの指定を受けた交換制御局30は、新しい通信チャネ
ルをもつ無線基地局22からの通信路をスイッチ31を
介して合成・分岐トランク32に接続し、合成・分岐ト
ランク32の中で無線基地局22からの通信路と、中継
回線33に対して二重接続し、図3(3)の状態にす
る。
Next, in step 104 of FIG. 1, the exchange control station 30 which has received the designation of a new communication channel from the mobile terminal 10 via the radio base station 21 in communication, receives the radio base station 22 having the new communication channel. 3 is connected to the combining / branching trunk 32 via the switch 31, and the communication path from the wireless base station 22 in the combining / branching trunk 32 and the relay line 33 are double-connected. Change to the state (3).

【0036】合成・分岐トランク32は無線基地局2
1,22から信号を合成して中継回線33へ出力し、中
継回線33からの信号を分岐して無線基地局21,22
のそれぞれへの出力することにより、移動端末10との
間で二重の通話路を形成する。
The combining / branching trunk 32 is the radio base station 2
1 and 22 to combine the signals and output them to the relay line 33, and branch the signals from the relay line 33 to wireless base stations 21 and 22.
To the mobile terminal 10 to form a double speech path.

【0037】次に図1の手順106で受信レベル値R2
が規定値H2を超えたとき、交換制御局30はこの通知
を受けて無線基地局21と合成・分岐トランク32との
通話路をスイッチ31で切断し図3(4)の状態にした
のち、スイッチ31を制御して、まず無線基地局22か
らの回線を中継回線33に直結し、図3(5)の状態に
したのち、この直結した両回線と合成・分岐トランク3
2との通話路形成を解除し、図3(6)の正常状態にな
る。
Next, in step 106 of FIG. 1, the reception level value R2
When the value exceeds the prescribed value H2, the exchange control station 30 receives this notification and disconnects the communication path between the radio base station 21 and the combining / branching trunk 32 with the switch 31 to bring it to the state of FIG. 3 (4). First, the switch 31 is controlled so that the line from the radio base station 22 is directly connected to the relay line 33, and the state of FIG. 3 (5) is established.
The formation of the communication path with 2 is released, and the normal state of FIG.

【0038】次に、図4は本発明の一実施例を示す機能
ブロック図である。
Next, FIG. 4 is a functional block diagram showing an embodiment of the present invention.

【0039】図示する移動端末は、アンテナ11,ハイ
ブリッド12,シンセサイザ13および制御部14が送
受信に共用される。
In the illustrated mobile terminal, the antenna 11, the hybrid 12, the synthesizer 13 and the control unit 14 are shared for transmission and reception.

【0040】まず、アンテナ11で受信した信号は、ハ
イブリッド12を介して受信混合器41へ入力する。受
信混合器41は、受信信号をシンセサイザ13からの搬
送波信号とかけ算し、中間周波(IF)信号に変換して
出力する。
First, the signal received by the antenna 11 is input to the reception mixer 41 via the hybrid 12. The reception mixer 41 multiplies the reception signal by the carrier signal from the synthesizer 13, converts it into an intermediate frequency (IF) signal, and outputs it.

【0041】レベル検出部42は受信混合器41の出力
IF信号を入力し、信号レベルに変換して比較器43へ
出力する。比較器43はこの入力を、しきい値メモリ4
4があらかじめ記憶する規定値と比較する。
The level detector 42 receives the output IF signal of the reception mixer 41, converts it into a signal level, and outputs it to the comparator 43. The comparator 43 inputs this input to the threshold memory 4
4 is compared with a specified value stored in advance.

【0042】復調器45は受信混合器41の出力のIF
信号を入力して復調したのち、タイミング検出部46お
よび分配器47へ出力する。タイミング検出部46は制
御部14からの制御により、比較器43に対して比較時
のタイミング情報を入力し、比較器43から結果を制御
部14へ出力させる。
The demodulator 45 outputs the IF of the output of the reception mixer 41.
The signal is input, demodulated, and then output to the timing detection unit 46 and the distributor 47. Under the control of the control unit 14, the timing detection unit 46 inputs the timing information at the time of comparison to the comparator 43, and causes the comparator 43 to output the result to the control unit 14.

【0043】分配器47は制御部14からの制御によ
り、無線基地局と通信中の受信信号を、この無線基地局
が一つの場合にはバッファ48へ、また二つの場合には
バッファ48,49へそれぞれ分配して入力する。二つ
のバッファ48,49それぞれの出力は復号化・出力部
50へ入力され復号化されて一つのアナログ音声信号で
出力される。
Under the control of the control unit 14, the distributor 47 sends the received signal in communication with the radio base station to the buffer 48 when there is one radio base station, and to the buffers 48 and 49 when there is two. Distribute to each and input. The outputs of the two buffers 48 and 49 are input to the decoding / output unit 50, decoded and output as one analog audio signal.

【0044】一方、アナログ音声信号はバッファ61に
入力したのち、符号化器62により圧縮符号化されて送
信制御部63に入力される。送信制御部63は制御部1
4の制御をうけ、送信フレームを組んで所定のタイミン
グで送信信号を変調器64に入力する。この入力信号は
変調器64で変調され、送信混合器65の放送波(R
F)信号に変換されたのち、ハイブリッド12を介して
アンテナ11から送信される。
On the other hand, after the analog audio signal is input to the buffer 61, it is compression encoded by the encoder 62 and input to the transmission control unit 63. The transmission control unit 63 is the control unit 1
Under the control of No. 4, a transmission frame is assembled and a transmission signal is input to the modulator 64 at a predetermined timing. This input signal is modulated by the modulator 64, and the broadcast wave (R
F) After being converted into a signal, it is transmitted from the antenna 11 via the hybrid 12.

【0045】次に、図4の復号化・出力部の二つの例に
ついて図5,6を参照して説明する。図5,6のそれぞ
れは復号化・出力部の一例を示すブロック図である。
Next, two examples of the decoding / output unit of FIG. 4 will be described with reference to FIGS. 5 and 6 are block diagrams showing an example of the decoding / output unit.

【0046】図5に示す復号化・出力部50は二つのバ
ッファ48,49からそれぞれ受信信号を入力してアナ
ログ音声信号に復号化し出力する二つの復号化器51,
52と、この復号化器51,52の出力を入力して加算
し出力する加算器53とを配備して構成する。
The decoding / output unit 50 shown in FIG. 5 receives two received signals from the two buffers 48 and 49, decodes them into analog voice signals, and outputs them to two decoders 51,
52, and an adder 53 for inputting, adding and outputting the outputs of the decoders 51, 52.

【0047】また、図6に示す復号化出力部70は、二
つのバッファ48,49からの受信信号を入力し、比較
器43の比較結果を受信し、レベルの大きい方を一つ選
択して出力する選択器71と、この出力を入力してアナ
ログ音声信号で出力する復号化器72とを配備して構成
する。
Further, the decoding output unit 70 shown in FIG. 6 receives the received signals from the two buffers 48 and 49, receives the comparison result of the comparator 43, and selects one having a higher level. A selector 71 for outputting and a decoder 72 for receiving the output and outputting as an analog audio signal are provided and configured.

【0048】本実施例では、移動端末が受信レベルをし
きい値と比較して動作する例を説明したが、受信レベル
の代りに、受信すべき信号波長をもつ希望波と、この希
望波を妨害する不要な干渉波とのレベル比、または希望
波とノイズのレベル比などを用いた方式でもよい。
In this embodiment, an example in which the mobile terminal operates by comparing the reception level with a threshold value has been described. However, instead of the reception level, a desired wave having a signal wavelength to be received and this desired wave are A method using a level ratio with an unnecessary interference wave that interferes or a level ratio between a desired wave and noise may be used.

【0049】また、合成・分岐トランクで二つの無線基
地局との回線を一つの中継回線に接続した方法を図示し
て図示して説明したが、交換制御局内で信号レベルの比
較結果により、一方だけを選択して接続方法、および同
報機能の応用など、他の方法も適用できる。
Further, the method of connecting the lines of the two radio base stations to one relay line by the combining / branching trunk has been shown and described in the figure, but according to the comparison result of the signal levels in the switching control station, Other methods can be applied, such as selecting only the connection method and applying the broadcast function.

【0050】更に、捕捉すれば、図7に一例を示す、い
わゆる時分割多重/ピンポン方式と呼ばれる通信フレー
ムを無線区間に使用することにより、一つの移動端末が
二つの無線基地局と同時通信を可能にする。
Further, if captured, one mobile terminal can simultaneously communicate with two radio base stations by using a communication frame called a time division multiplex / ping-pong system, an example of which is shown in FIG. 7, in the radio section. to enable.

【0051】この方式は、現在ヨーロッパの次世代コー
ドレス電話システム用に提案されていものである。すな
わち、一つの周波数上に移動端末から無線基地局への上
りフレームと、無線基地局から移動端末への下りフレー
ムとを時分割多重化し、それぞれチャネルCH1〜CH
5の通信チャネルが時分割多重化された構成になってい
る。
This system is currently proposed for the European next-generation cordless telephone system. That is, an uplink frame from the mobile terminal to the radio base station and a downlink frame from the radio base station to the mobile terminal are time-division multiplexed on one frequency, and channels CH1 to CH are respectively provided.
The five communication channels are time-division multiplexed.

【0052】各無線基地局は少くつも一つの下り用通信
チャネルの制御部に、常時自局の識別信号を放送する。
移動端末はこれを受信して容易にこのフレームに含まれ
る他の無線基地局の受信レベルが測定できると同時に複
数の無線基地局との信号の送受信ができる。また、通信
チャネルCH1〜CH5のそれぞれは、制御部と、音声
信号などの情報を乗せる情報部とで構成される。
Each radio base station constantly broadcasts its own identification signal to at least one downlink communication channel controller.
The mobile terminal receives this and can easily measure the reception level of other radio base stations included in this frame, and at the same time, can transmit / receive signals to / from a plurality of radio base stations. Further, each of the communication channels CH1 to CH5 is composed of a control unit and an information unit for carrying information such as a voice signal.

【0053】[0053]

【発明の効果】以上説明したように、本発明によれば、
移動端末が受信中の通信チャネルの電波の受信レベル値
R1を検出し規定値H1以下の場合、他の無線基地局の
通信チャネルの電波のうち一つのレベル値R2を選択
し、この選択した通信チャネルを通信路として二重化す
ることにより、相違する二つの無線基地局と通信チャネ
ルを形成するので、ハンドオフによる瞬断が皆無となる
ほか、シャドウィングおよびフェージングによるレベル
の異常低下および瞬断も一方で生じても他方が健在の場
合が多く、通信品質の劣化を防止する効果がある。
As described above, according to the present invention,
When the mobile terminal detects the reception level value R1 of the radio wave of the communication channel being received and is equal to or less than the specified value H1, it selects one level value R2 of the radio waves of the communication channels of other radio base stations, and selects the selected communication. By duplicating the channel as a communication path, a communication channel is formed with two different radio base stations, so there is no instantaneous interruption due to handoff, and abnormal level drop and interruption due to shadowing and fading are also on the other hand. Even if they occur, the other is often alive and effective in preventing deterioration of communication quality.

【0054】特に屋内での通信品質は重視されるので、
このような手段が有効である。
Since the communication quality indoors is particularly important,
Such means is effective.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の主要動作手順の一実施例を示す流れ図
である。
FIG. 1 is a flow chart showing an embodiment of a main operation procedure of the present invention.

【図2】本発明による一実施例を示す中継方式図であ
る。
FIG. 2 is a relay system diagram showing an embodiment according to the present invention.

【図3】図1の手順によるスイッチの一例を示す継続状
態図である。
FIG. 3 is a continuation state diagram showing an example of a switch according to the procedure of FIG.

【図4】本発明の一実施例を示す機能ブロック図であ
る。
FIG. 4 is a functional block diagram showing an embodiment of the present invention.

【図5】図4の部分詳細の第1の実施例を示すブロック
図である。
5 is a block diagram showing a first example of the partial details of FIG. 4; FIG.

【図6】図4の部分詳細の第2の実施例を示すブロック
図である。
FIG. 6 is a block diagram showing a second embodiment of the partial details of FIG. 4;

【図7】通信フレームの一例を示すフォーマット図であ
る。
FIG. 7 is a format diagram showing an example of a communication frame.

【図8】従来の一例を示す中継方式図である。FIG. 8 is a relay system diagram showing a conventional example.

【符号の説明】[Explanation of symbols]

10 移動端末 21〜23 基地局 30 交換制御局 31 スイッチ 32 合成・分岐トランク 33 中継回線 43 比較器 48,49 バッファ 50,70 復号化出力部 51,52,72 復号化器 53 加算器 71 選択器 10 Mobile Terminals 21-23 Base Station 30 Switching Control Station 31 Switch 32 Combine / Branch Trunk 33 Relay Line 43 Comparator 48,49 Buffer 50,70 Decoding Output Unit 51,52,72 Decoder 53 Adder 71 Selector

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 移動しつつ複数の無線基地局と交信して
ディジタル符号化音声信号で通信する移動端末におい
て、 一つの通信チャンネルを設定して通信中の電波の受信レ
ベルR1が所定のしきい値H1より小さくなったとき、
他の最大の受信レベルR2をもつ電波の一つの通信チャ
ネルを選択して通信中の通信チャネルと同時に送受信す
る送受信手段を有することを特徴とする移動端末。
1. In a mobile terminal which communicates with a plurality of radio base stations while moving and communicates with a digitally encoded voice signal, one communication channel is set and a reception level R1 of radio waves during communication is a predetermined threshold. When it becomes smaller than the value H1,
A mobile terminal comprising a transmitting / receiving means for selecting one communication channel of a radio wave having another maximum reception level R2 and transmitting / receiving simultaneously with the communication channel in communication.
【請求項2】 前記送受信手段が、 二つの受信レベルR1・R2の何れか一方が所定の別の
しきい値H2(>H1)より大きくなったとき、小さい
方の受信レベルをもつ電波の通信チャネルの通信を終了
することを特徴とする請求項1記載の移動端末。
2. The transmission / reception means, when either of the two reception levels R1 and R2 exceeds a predetermined threshold value H2 (> H1), the radio wave communication having the smaller reception level. The mobile terminal according to claim 1, wherein communication on the channel is terminated.
【請求項3】 前記送受信手段が二つの通信チャネルで
同時に通信するとき、 二つの受信チャネルの符号化音声信号をそれぞれ復号化
する復号化器と、 この復号化器から出力する二つのアナログ音声信号を入
力して合成し出力する加算器とを有することを特徴とす
る請求項1記載の移動端末。
3. A decoder for decoding encoded voice signals of two reception channels when the transmitting / receiving means simultaneously communicates in two communication channels, and two analog voice signals output from the decoder. 2. The mobile terminal according to claim 1, further comprising an adder for inputting, combining and outputting.
【請求項4】 前記送受信手段が二つの通信チャネルで
同時に通信するとき、 二つの受信チャネルの符号化音声信号それぞれの、同一
周期内に受信した受信データの受信レベルを比較し、大
きい方の信号だけを出力する比較器と、 この比較器が出力する符号化音声信号を入力して復号化
したアナログ音声信号を出力する復号化器とを有するこ
と特徴とする請求項1記載の移動端末。
4. When the transmitting / receiving means simultaneously communicates in two communication channels, the reception levels of the reception data received in the same cycle of the encoded voice signals of the two reception channels are compared, and the larger signal is compared. 2. The mobile terminal according to claim 1, further comprising: a comparator that outputs only the above, and a decoder that inputs an encoded voice signal output from this comparator and outputs a decoded analog voice signal.
JP4061613A 1992-03-18 1992-03-18 Mobile terminal Pending JPH0645990A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4061613A JPH0645990A (en) 1992-03-18 1992-03-18 Mobile terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4061613A JPH0645990A (en) 1992-03-18 1992-03-18 Mobile terminal

Publications (1)

Publication Number Publication Date
JPH0645990A true JPH0645990A (en) 1994-02-18

Family

ID=13176196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4061613A Pending JPH0645990A (en) 1992-03-18 1992-03-18 Mobile terminal

Country Status (1)

Country Link
JP (1) JPH0645990A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004057903A1 (en) * 2002-12-19 2004-07-08 Fujitsu Limited Mobile node
US6807413B1 (en) 1999-12-01 2004-10-19 Nec Corporation Mobile terminal communication system
JP2005064723A (en) * 2003-08-08 2005-03-10 Sony Corp Communication system and method, communication terminal device, and program
KR100827184B1 (en) * 2007-07-24 2008-05-06 후지쯔 가부시끼가이샤 Mobile node
US7505436B2 (en) 2001-06-29 2009-03-17 Qualcomm Corporation Communication system employing multiple handoff criteria
JP2009544243A (en) * 2006-07-14 2009-12-10 クゥアルコム・インコーポレイテッド Method and apparatus for supporting multiple connections
US8005054B2 (en) 2003-08-08 2011-08-23 Sony Corporation Communication system, communication method, communication terminal device, control method thereof, and program

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62199132A (en) * 1986-02-27 1987-09-02 Nippon Telegr & Teleph Corp <Ntt> Channel changeover system during communication
JPH03226127A (en) * 1990-01-31 1991-10-07 Nec Corp Channel changeover system during talking for mobile communication system
JPH0435327A (en) * 1990-05-28 1992-02-06 Sony Corp Mobile object communication equipment
JPH0435329A (en) * 1990-05-28 1992-02-06 Nec Corp Channel switching system in busy state

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62199132A (en) * 1986-02-27 1987-09-02 Nippon Telegr & Teleph Corp <Ntt> Channel changeover system during communication
JPH03226127A (en) * 1990-01-31 1991-10-07 Nec Corp Channel changeover system during talking for mobile communication system
JPH0435327A (en) * 1990-05-28 1992-02-06 Sony Corp Mobile object communication equipment
JPH0435329A (en) * 1990-05-28 1992-02-06 Nec Corp Channel switching system in busy state

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6807413B1 (en) 1999-12-01 2004-10-19 Nec Corporation Mobile terminal communication system
US7505436B2 (en) 2001-06-29 2009-03-17 Qualcomm Corporation Communication system employing multiple handoff criteria
CN100409716C (en) * 2002-12-19 2008-08-06 富士通株式会社 Mobile node
WO2004057903A1 (en) * 2002-12-19 2004-07-08 Fujitsu Limited Mobile node
US7680081B2 (en) 2002-12-19 2010-03-16 Fujitsu Limited Mobile node
US8005054B2 (en) 2003-08-08 2011-08-23 Sony Corporation Communication system, communication method, communication terminal device, control method thereof, and program
JP2005064723A (en) * 2003-08-08 2005-03-10 Sony Corp Communication system and method, communication terminal device, and program
US8755294B2 (en) 2003-08-08 2014-06-17 Sony Corporation Communication system, communication method, communication terminal device, control method thereof, and program
JP4605428B2 (en) * 2003-08-08 2011-01-05 ソニー株式会社 COMMUNICATION SYSTEM, COMMUNICATION TERMINAL DEVICE, COMMUNICATION METHOD, AND PROGRAM
JP2009544243A (en) * 2006-07-14 2009-12-10 クゥアルコム・インコーポレイテッド Method and apparatus for supporting multiple connections
US8849352B2 (en) 2006-07-14 2014-09-30 Qualcomm Incorporated Methods and apparatus for supporting multiple connections
US9736721B2 (en) 2006-07-14 2017-08-15 Qualcomm Incorporated Methods and apparatus for supporting multiple connections
KR100827184B1 (en) * 2007-07-24 2008-05-06 후지쯔 가부시끼가이샤 Mobile node

Similar Documents

Publication Publication Date Title
AU670440B2 (en) Mobile assisted handover using CDMA
US6195567B1 (en) Antenna system for a cellular telephone network
FI79768B (en) CELLARTAL RADIOTELEFONSYSTEM, FOERFARANDE FOER OEVERFOERING AV DATAMEDDELANDEN OCH BASSTATION.
JP3329814B2 (en) Base station for frequency hopping TDMA wireless communication device
AU712944B2 (en) Diversity gain controlled cell-site transmission to prevent traffic signals from propogating beyond reachable extent of control signals
US7379749B2 (en) Radio terminal apparatus and reception operation control program thereof
US6574475B1 (en) Mobile communication system capable of performing soft-handover between base station controllers connected to different mobile communication exchanges
US20060286945A1 (en) Inter-frequency handover for multiple antenna wireless transmit/receive units
JPH11511601A (en) Handover method and cellular radio system
JPH06506335A (en) Digital cellular microcell system
JP2002246965A (en) Information transmission method and system, transmitter and receiver
JPH11511600A (en) Method for selecting handover method and cellular radio system
JP2002500837A (en) Measurement by parallel frequency in wireless communication equipment
JP2009514328A (en) Wireless communication system with a subset of base stations functioning according to the MIMO principle coordinated with each other
JPH0645990A (en) Mobile terminal
WO1993002509A1 (en) Digital mobile telephone system having overlay configuration
JPH09312869A (en) Soft handover start/end process executing method and base and mobile station devices
JP2590692B2 (en) Method and system for switching channels during a call in mobile communication
JPH02200018A (en) Diversity branch switching control system
JPH0645991A (en) Simultaneous communication system
JP2001516534A (en) Method for combining signals and receiver
JP3639168B2 (en) Communication control method, mobile communication system, base station, and mobile station
EP1370104B1 (en) Method and system for determining an antenna of a radio base station at a moving target area during handover
JPH05252100A (en) Mobile body communication system
AU9352798A (en) Method for improving radio connection quality in radio system

Legal Events

Date Code Title Description
A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20000418