JPH0653903A - Control channel switching system - Google Patents
Control channel switching systemInfo
- Publication number
- JPH0653903A JPH0653903A JP4204602A JP20460292A JPH0653903A JP H0653903 A JPH0653903 A JP H0653903A JP 4204602 A JP4204602 A JP 4204602A JP 20460292 A JP20460292 A JP 20460292A JP H0653903 A JPH0653903 A JP H0653903A
- Authority
- JP
- Japan
- Prior art keywords
- control channel
- channel signal
- signal amount
- downlink control
- radio base
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は移動体通信システムにお
ける制御チャネル切り替え方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control channel switching system in a mobile communication system.
【０００２】[0002]
【従来の技術】従来のセルラー方式移動体通信システム
では、制御チャネルは動作論理上デディケイテッド（Ｄ
ｅｄｉｃａｔｅｄ）制御チャネルとページング（Ｐａｇ
ｉｎｇ）制御チャネルとアクセス（Ａｃｃｅｓｓ）制御
チャネルの三つに分かれている。一つの制御チャネル装
置にこれら三つの論理的制御チャネル動作を同時に行わ
せる事も可能であり、複数の制御チャネル装置に三つの
論理的制御チャネル動作を分担させる事も可能である。
これらの制御チャネル論理的チャネル機能割付はシステ
ムを構築する時に決定され、その後システム動作状況変
化に応じて人為的に機能割付が変更される以外に、機能
割付変更がなされる事は無い。またシステムを構築する
時に最も多く取られる制御チャネル機能割付は、制御チ
ャネル装置数をより少なくする、１制御チャネル装置に
三つの論理的制御チャネル動作を行わせるという割付で
ある。2. Description of the Related Art In a conventional cellular type mobile communication system, a control channel is operationally logically dedicated (D).
edited control channel and paging (Pag)
ing) control channel and access control channel. It is possible to allow one control channel device to simultaneously perform these three logical control channel operations, and it is also possible for a plurality of control channel devices to share the three logical control channel operations.
These control channels and logical channel function assignments are determined when the system is constructed, and thereafter, the function assignments are not changed except for artificially changing the function assignments in response to changes in the system operation status. Further, the control channel function allocation that is most often taken when constructing a system is the allocation of one control channel device to perform three logical control channel operations, which reduces the number of control channel devices.
【０００３】一方、制御チャネル動作の信頼性向上のた
め、装置構成として常用系である常用制御チャネル装置
と予備系である予備制御チャネル装置による待機予備冗
長構成が制御チャネルには取られる。常用装置に故障が
生じた場合には、待機させていた予備装置に常用装置の
代替を行わせる、制御チャネル切り替えが行われる。On the other hand, in order to improve the reliability of the control channel operation, the control channel is provided with a standby spare redundant structure composed of a normal control channel device which is a normal system and a standby control channel device which is a standby system. When a failure occurs in the regular device, control channels are switched so that the standby device, which has been on standby, substitutes for the regular device.
【０００４】[0004]
【発明が解決しようとする課題】従来のセルラー方式移
動体通信システムにおいて、移動体端末から無線基地局
へ送信される上り制御チャネル信号量と、無線基地局か
ら移動体端末に送信される下り制御チャネル信号量とを
比較した場合、チャネル動作の特性に依存し下り制御チ
ャネル信号量の方が多い。In the conventional cellular mobile communication system, the amount of uplink control channel signal transmitted from the mobile terminal to the radio base station and the downlink control transmitted from the radio base station to the mobile terminal. When compared with the channel signal amount, the downlink control channel signal amount is larger depending on the characteristics of the channel operation.
【０００５】一方、無線基地局から移動体端末への下り
制御チャネル信号伝送は、仕様書で規定された信号伝送
速度で行われており、この信号伝送速度に起因して１制
御チャネル装置が単位時間当りに移動体端末に対して伝
送可能な下り制御チャネル信号量に限界が存在する。On the other hand, the downlink control channel signal transmission from the radio base station to the mobile terminal is performed at the signal transmission rate specified in the specifications, and one control channel device is a unit due to this signal transmission rate. There is a limit to the amount of downlink control channel signals that can be transmitted to a mobile terminal per hour.
【０００６】システム加入者の増加および呼量の増加に
連れて、下り制御チャネル信号量が増加し、やがてこの
限界下り制御チャネル信号量を越えると、伝送不可能な
下り制御チャネル信号が現われ、呼損が生じるという問
題点がある。As the number of system subscribers and the call volume increase, the downlink control channel signal amount increases, and when the limit downlink control channel signal amount is exceeded, a downlink control channel signal that cannot be transmitted appears and a call is transmitted. There is a problem of loss.
【０００７】制御チャネル機能割付として１制御チャネ
ル装置にＤｅｄｉｃａｔｅｄ制御チャネル、Ｐａｇｉｎ
ｇ制御チャネルおよびＡｃｃｅｓｓ制御チャネルの各機
能をすべて割り付けた場合、制御チャネル信号の分散が
計れず１制御チャネル装置にすべての制御チャネル信号
が集中するため、下り制御チャネル信号量の処理限界が
早く訪れ、多くの呼量をサービスできないという問題点
がある。As a control channel function allocation, one control channel device is provided with a Dedicated control channel, Pagin
g When all the functions of the control channel and the access control channel are all assigned, the control channel signal cannot be dispersed and all the control channel signals concentrate on one control channel device. However, there is a problem that a large amount of calls cannot be serviced.
【０００８】制御チャネル機能割付として複数の制御チ
ャネル装置にＤｅｄｉｃａｔｅｄ制御チャネル、Ｐａｇ
ｉｎｇ制御チャネルおよびＡｃｃｅｓｓ制御チャネル機
能を分離して割り付けた場合、制御チャネル信号の分散
が計れる分だけ、より多くの呼量をサービスする事が可
能ではあるが、制御チャネル装置数が多くなるため、無
線基地局の電力消費量が大きくなり、またシステムコス
トが高くなるという問題点がある。Dedicated control channels, Pags, are assigned to a plurality of control channel devices as control channel function allocations.
When the ing control channel and the Access control channel functions are separately allocated, it is possible to serve a larger amount of call because the control channel signals can be distributed, but the number of control channel devices increases. There are problems that the power consumption of the wireless base station increases and the system cost increases.
【０００９】[0009]
【課題を解決するための手段】本発明の制御チャネル切
り替え方式は、複数の移動体端末と制御信号の送受信を
行う制御チャネル用に常用系および予備系の制御チャネ
ル装置を有する無線基地局から構成される移動体通信シ
ステムにおいて、前記無線基地局は、下り制御チャネル
信号量上限しきい値および下り制御チャネル信号量下限
しきい値を保有する手段と、下り制御チャネル信号量を
計測する手段と、前記常用系の制御チャネル装置の状態
が動作中かつ前記予備系の制御チャネル装置の状態が待
機中、もしくは前記常用系の制御チャネル装置の状態が
待機中かつ前記予備系の制御チャネル装置の状態が動作
中にあり、計測された下り制御チャネル信号量が前記下
り制御チャネル信号量上限しきい値を越えている場合
に、前記常用系の制御チャネル装置と前記予備系の制御
チャネル装置の双方を動作させ制御チャネル動作の分割
を行う手段と、前記常用系の制御チャネル装置と前記予
備系の制御チャネル装置の双方が動作している状態で、
計測された下り制御チャネル信号量が前記下り制御チャ
ネル信号量下限しきい値を下回った場合、前記常用系の
制御チャネル装置のみ動作させ制御チャネル動作の統合
を行う手段とを有する構成である。A control channel switching system of the present invention comprises a radio base station having a control channel device of a normal system and a control system for a control channel for transmitting and receiving control signals to and from a plurality of mobile terminals. In the mobile communication system, the radio base station, means for holding a downlink control channel signal amount upper limit threshold and downlink control channel signal amount lower limit threshold, means for measuring the downlink control channel signal amount, The state of the control channel device of the standby system is operating and the state of the control channel device of the standby system is waiting, or the state of the control channel device of the standby system is waiting and the state of the control channel device of the standby system is In operation, when the measured downlink control channel signal amount exceeds the downlink control channel signal amount upper limit threshold, the control of the normal system is performed. In a state in which the means for performing the division of both the operated control channel operation of the channel device backup system of the control channel system, both of the conventional system control channel device and the standby system control channel device is operating,
When the measured downlink control channel signal amount falls below the downlink control channel signal amount lower limit threshold value, only the control channel device of the normal system is operated and the control channel operation is integrated.
【００１０】[0010]
【実施例】以下に、本発明について図面を参照して説明
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１１】図１は本実施例の対象とされる移動体通信
システムの装置構成を示した図である。無線基地局２は
移動体電話交換局１と信号線および音声線の集合線であ
る音声・信号接続線１１により接続され、移動体電話端
末相互間あるいは移動体端末と一般有線電話端末間の通
話は、通話チャネル装置６と移動体電話交換局１を介し
て行われる。本実施例では通話チャネルは一つしか示さ
れていないが、実際には予想される呼量に応じて複数の
通話チャネルが設置される。FIG. 1 is a diagram showing a device configuration of a mobile communication system to which the present embodiment is applied. The radio base station 2 is connected to the mobile telephone switching center 1 by a voice / signal connection line 11 which is a collective line of signal lines and voice lines, and calls between mobile telephone terminals or between mobile terminals and general wired telephone terminals. Is performed via the call channel device 6 and the mobile telephone switching center 1. Although only one call channel is shown in this embodiment, a plurality of call channels are actually installed according to the expected call volume.
【００１２】制御チャネル構成は、１制御チャネル装置
がＤｅｄｉｃａｔｅｄ，Ｐａｇｉｎｇ，Ａｃｃｅｓｓの
すべての論理チャネル動作を行う最少構成である。ま
た、制御チャネルの動作の信頼性向上のため、本実施例
では現用制御チャネル装置４と予備制御チャネル装置５
によって、待機予備冗長構成がとられている。いずれの
制御チャネル装置も信号線１２を介して無線基地局主制
御装置３とマルチ接続される。The control channel configuration is the minimum configuration in which one control channel device performs all the logical channel operations of Dedicated, Paging, and Access. Further, in order to improve the reliability of the operation of the control channel, the working control channel device 4 and the spare control channel device 5 are used in this embodiment.
The standby standby redundant configuration is adopted by the. Any control channel device is multi-connected to the radio base station main control device 3 via the signal line 12.
【００１３】さらに制御チャネル装置４および５は信号
線１３および１４を介してアンテナ７および８と、通話
チャネル装置６は信号線１５を介してアンテナ９と接続
されている。Further, the control channel devices 4 and 5 are connected to the antennas 7 and 8 via the signal lines 13 and 14, and the communication channel device 6 is connected to the antenna 9 via the signal line 15.
【００１４】次に、以上のような構成のＥＩＡ／ＴＩ
Ａ，ＴＡＣＳ仕様の移動体通信システムにおいて、本制
御チャネル切り替え方式を説明する。Next, the EIA / TI having the above configuration
This control channel switching method in the mobile communication system of the A and TACS specifications will be described.
【００１５】無線基地局主制御装置３に下り制御チャネ
ル信号量上限しきい値と下り制御チャネル信号量下限し
きい値を予め決定し、保持させる。ここで、下り制御チ
ャネル信号量上限しきい値は、制御チャネル動作分割が
行われていない制御チャネル構成において、Ｄｅｄｉｃ
ａｔｅｄ制御チャネル信号、Ｐａｇｉｎｇ制御チャネル
信号およびＡｃｃｅｓｓ制御チャネル信号の総信号量が
任意の単位時間（これをｓｔと表す）に１制御チャネル
が伝送可能な下り制御チャネル信号量の伝送限界に近づ
き、制御チャネルの動作分割が必要であると判断する下
り制御チャネル信号量基準値である。また、下り制御チ
ャネル信号量下限しきい値は、制御チャネル動作分割が
行われている制御チャネル構成において、Ｄｅｄｉｃａ
ｔｅｄ制御チャネル信号、Ｐａｇｉｎｇ制御チャネル信
号およびＡｃｃｅｓｓ制御チャネル信号の総信号量が任
意の単位時間（ｓｔ）に１制御チャネルが伝送可能な下
り制御チャネル信号量の限界内になり、制御チャネルの
動作分割が不要であると判断する下り制御チャネル信号
量基準値である。これらは下り制御チャネル信号長およ
び下り制御チャネル信号伝送速度によりシステム毎に任
意の値が設定されるものとする。The radio base station main controller 3 predetermines and holds the downlink control channel signal amount upper limit threshold value and the downlink control channel signal amount lower limit threshold value. Here, in the control channel configuration in which the control channel operation division is not performed, the downlink control channel signal amount upper limit threshold is
When the total signal amount of the aged control channel signal, the paging control channel signal and the access control channel signal approaches the transmission limit of the downlink control channel signal amount that can be transmitted by one control channel in an arbitrary unit time (this is represented by st), control is performed. This is a downlink control channel signal amount reference value for determining that operation division of channels is necessary. Also, the downlink control channel signal amount lower limit threshold is
The total signal amount of the ted control channel signal, the paging control channel signal, and the access control channel signal is within the limit of the downlink control channel signal amount that can be transmitted by one control channel at an arbitrary unit time (st), and the control channel operation division is performed. Is a downlink control channel signal amount reference value for determining that it is unnecessary. These are set to arbitrary values for each system depending on the downlink control channel signal length and the downlink control channel signal transmission rate.
【００１６】無線基地局２において、通信サービスが開
始されると無線基地局主制御装置３は常用制御チャネル
装置４を介して移動体端末へＤｅｄｉｃａｔｅｄ制御チ
ャネル信号、Ｐａｇｉｎｇ制御チャネル信号あるいはＡ
ｃｃｅｓｓ制御チャネル信号を送信する事となる。その
際、無線基地局主制御装置３は送信した下り制御チャネ
ル信号の信号長を下り制御チャネル信号量として加算す
る。すなわち無線基地局主制御装置３は下り制御チャネ
ル信号量の累計を計測する。When a communication service is started in the radio base station 2, the radio base station main control unit 3 sends a Dedicated control channel signal, a Paging control channel signal or A to the mobile terminal via the regular control channel unit 4.
The ccess control channel signal is transmitted. At that time, the radio base station main controller 3 adds the signal length of the transmitted downlink control channel signal as the downlink control channel signal amount. That is, the radio base station main controller 3 measures the total amount of downlink control channel signals.
【００１７】一方、無線基地局主制御装置３はこの下り
制御チャネル信号量の累計を任意の単位時間（ｓｔ）周
期に下り制御チャネル信号量上限しきい値と比較すると
同時に、下り制御チャネル信号量の累計値をゼロに戻す
動作を繰り返す。On the other hand, the radio base station main controller 3 compares the cumulative total of the downlink control channel signal amounts with the downlink control channel signal amount upper limit threshold in an arbitrary unit time (st) cycle, and at the same time, The operation of returning the accumulated value of to zero is repeated.
【００１８】下り制御チャネル信号量と下り制御チャネ
ル信号上限しきい値の比較の結果、下り制御チャネル信
号量累計値が下り制御チャネル信号量上限しきい値を下
回っている場合、無線基地局主制御装置３は制御チャネ
ル切り替えを行う事は無いが、下り制御チャネル信号量
の累計値が下り制御チャネル信号量の上限値を越えてい
た場合、無線基地局主制御装置３は制御チャネル動作の
分割が必要であると判断し常用制御チャネル装置に加え
て、本来常用制御チャネル装置の保守あるいは障害が発
生した場合にのみ常用制御チャネル装置の代替を行う予
備制御チャネル装置を、同時に動作させて制御チャネル
動作の分割を行う。As a result of the comparison between the downlink control channel signal amount and the downlink control channel signal upper limit threshold, if the cumulative value of the downlink control channel signal amount is below the downlink control channel signal amount upper limit threshold, the radio base station main control Although the device 3 does not switch the control channel, if the cumulative value of the downlink control channel signal amount exceeds the upper limit value of the downlink control channel signal amount, the radio base station main control device 3 divides the control channel operation. In addition to the normal control channel device that is determined to be necessary, the control channel operation is performed by simultaneously operating the spare control channel device that replaces the normal control channel device only when maintenance or failure of the normal normal control channel device occurs. Split.
【００１９】その後、無線基地局主制御装置３は下り制
御チャネル信号量の累計を任意の単位時間（ｓｔ）周期
に下り制御チャネル信号量下限しきい値と比較すると同
時に、下り制御チャネル信号量の累計値をゼロに戻す動
作を繰り返す。After that, the radio base station main controller 3 compares the cumulative total of the downlink control channel signal amounts with the downlink control channel signal amount lower limit threshold value at an arbitrary unit time (st) cycle, and at the same time, The operation of returning the accumulated value to zero is repeated.
【００２０】下り制御チャネル信号量と下り制御チャネ
ル信号下限しきい値の比較の結果、下り制御チャネル信
号量累計値が下り制御チャネル信号量上限しきい値を上
回っている場合、無線基地局主制御装置３は制御チャネ
ル切り替えを行う事は無いが、下り制御チャネル信号量
の累計値が下り制御チャネル信号量の上限値を下回って
いた場合、無線基地局主制御装置３は制御チャネル動作
の分割は不要になったと判断し予備制御チャネル装置を
待機中に戻し、常用制御チャネル装置にＤｅｄｉｃａｔ
ｅｄ，ＰａｇｉｎｇおよびＡｃｃｅｓｓのすべての制御
チャネル動作を行わせ制御チャネル動作の分割を停止す
る。As a result of the comparison between the downlink control channel signal amount and the downlink control channel signal lower limit threshold value, if the downlink control channel signal amount cumulative value exceeds the downlink control channel signal amount upper limit threshold value, the radio base station main control The device 3 does not perform control channel switching, but if the cumulative value of the downlink control channel signal amount is below the upper limit value of the downlink control channel signal amount, the radio base station main control device 3 does not divide the control channel operation. It is determined that it is no longer needed, the standby control channel device is returned to the standby state, and the regular control channel device is dedicated.
All control channel operations of ed, paging, and access are performed, and division of the control channel operation is stopped.
【００２１】以後、無線基地局主制御装置３は再び下り
制御チャネル信号量累計値と下り制御チャネル信号量上
限しきい値の比較動作にもどり、前述した動作を繰り返
す事となる。これにより図２に示すような下り制御チャ
ネル信号量に基づく制御チャネル切り替えが実現できる
事になる。Thereafter, the radio base station main controller 3 returns to the operation of comparing the cumulative value of the downlink control channel signal amount and the downlink control channel signal amount upper threshold again, and repeats the above-mentioned operation. As a result, control channel switching based on the downlink control channel signal amount as shown in FIG. 2 can be realized.
【００２２】[0022]
【発明の効果】以上説明したように本発明は、無線基地
局主制御装置が実際の下り制御チャネル信号量に基づい
て常用制御チャネル装置および予備制御チャネル装置を
同時に動作させ、制御チャネル構成を切り替え制御する
ように構成したので、無線基地局当りの制御チャネル装
置設置数が同一であっても、従来の方式よりもより多く
の通信サービスを提供する事が可能であり、また固定的
に制御チャネルの動作分割を行う従来の方式に比べ、制
御チャネル装置の設置数を必要最少限に抑える事が可能
である。As described above, according to the present invention, the radio base station main controller simultaneously operates the normal control channel device and the spare control channel device based on the actual downlink control channel signal amount to switch the control channel configuration. Since it is configured to control, even if the number of control channel devices installed per radio base station is the same, it is possible to provide more communication services than the conventional system, and the control channel is fixed. It is possible to minimize the number of control channel devices to be installed as compared with the conventional method of dividing the operation of the above.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の対象とされる移動体通信システムの装
置構成を示した図である。FIG. 1 is a diagram showing a device configuration of a mobile communication system to which the present invention is applied.
【図２】本発明の一実施例の下り制御チャネル信号量に
基づいた制御チャネル切り替え動作を示した図である。FIG. 2 is a diagram showing a control channel switching operation based on a downlink control channel signal amount according to an embodiment of the present invention.
１ 移動体電話交換局 ２ 無線基地局 ３ 無線基地局主制御装置 ４ 現用制御チャネル装置 ５ 予備制御チャネル装置 ６ 通話チャネル装置 ７〜９ アンテナ １１ 音声・信号接続線 １２〜１５ 信号線 1 Mobile Telephone Switching Office 2 Radio Base Station 3 Radio Base Station Main Controller 4 Working Control Channel Device 5 Standby Control Channel Device 6 Speech Channel Device 7-9 Antenna 11 Voice / Signal Connection Line 12-15 Signal Line
Claims (1)
行う制御チャネル用に常用系および予備系の制御チャネ
ル装置を有する無線基地局から構成される移動体通信シ
ステムにおいて、 前記無線基地局は、下り制御チャネル信号量上限しきい
値および下り制御チャネル信号量下限しきい値を保有す
る手段と、 下り制御チャネル信号量を計測する手段と、 前記常用系の制御チャネル装置の状態が動作中かつ前記
予備系の制御チャネル装置の状態が待機中、もしくは前
記常用系の制御チャネル装置の状態が待機中かつ前記予
備系の制御チャネル装置の状態が動作中にあり、計測さ
れた下り制御チャネル信号量が前記下り制御チャネル信
号量上限しきい値を越えている場合に、前記常用系の制
御チャネル装置と前記予備系の制御チャネル装置の双方
を動作させ制御チャネル動作の分割を行う手段と、 前記常用系の制御チャネル装置と前記予備系の制御チャ
ネル装置の双方が動作している状態で、計測された下り
制御チャネル信号量が前記下り制御チャネル信号量下限
しきい値を下回った場合、前記常用系の制御チャネル装
置のみ動作させ制御チャネル動作の統合を行う手段とを
有することを特徴とする制御チャネル切り替え方式。1. A mobile communication system comprising a radio base station having a control channel device for a regular system and a control channel device for a standby system for transmitting and receiving control signals to and from a plurality of mobile terminals, wherein the radio base station is A means for holding a downlink control channel signal amount upper limit threshold value and a downlink control channel signal amount lower limit threshold value, a means for measuring the downlink control channel signal amount lower limit value, a state in which the control channel device of the normal system is operating and The standby control channel device is in the standby state, or the normal control channel device is in the standby state and the standby control channel device is in the operating state, and the measured downlink control channel signal amount is Both exceed the downlink control channel signal amount upper limit threshold value, both the normal control channel device and the standby control channel device And a means for dividing the control channel operation, and a state in which both the normal control channel device and the standby control channel device are operating, the measured downlink control channel signal amount is the downlink control A control channel switching system comprising: means for operating only the control channel device of the normal system when the channel signal amount lower limit threshold value is exceeded, and integrating the control channel operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4204602A JP2972446B2 (en) | 1992-07-31 | 1992-07-31 | Control channel switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4204602A JP2972446B2 (en) | 1992-07-31 | 1992-07-31 | Control channel switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0653903A true JPH0653903A (en) | 1994-02-25 |
| JP2972446B2 JP2972446B2 (en) | 1999-11-08 |
Family
ID=16493182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4204602A Expired - Fee Related JP2972446B2 (en) | 1992-07-31 | 1992-07-31 | Control channel switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2972446B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4828359A (en) * | 1986-01-09 | 1989-05-09 | Sumitomo Electric Industries, Ltd. | Alkyl methacrylate homo - or copolymer optical waveguide for illumination and production of the same |
| KR20000039980A (en) * | 1998-12-16 | 2000-07-05 | 김영환 | Method for transmitting multi-message between service control part and subscriber registration part of communication system |
| KR100342633B1 (en) * | 1998-10-26 | 2002-07-04 | 가네꼬 히사시 | Mobile communication system capable of reducing a traffic between a control station and base stations |
| KR100426774B1 (en) * | 1998-12-16 | 2004-06-12 | 엘지전자 주식회사 | How to handle supplementary service messages at the exchange |
| US6963746B2 (en) | 2001-06-27 | 2005-11-08 | Fujitsu Limited | Radio base station transceiver sub-system |
| US7448166B2 (en) | 2005-02-14 | 2008-11-11 | Toyota Motor Engineering & Manufacturing North America, Inc. | Cable guide mechanism for luggage handles |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0373629A (en) * | 1989-08-15 | 1991-03-28 | Matsushita Electric Ind Co Ltd | Cordless telephone set |
| JPH03108916A (en) * | 1989-09-22 | 1991-05-09 | Nippon Telegr & Teleph Corp <Ntt> | Mobile communication control system |
-
1992
- 1992-07-31 JP JP4204602A patent/JP2972446B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0373629A (en) * | 1989-08-15 | 1991-03-28 | Matsushita Electric Ind Co Ltd | Cordless telephone set |
| JPH03108916A (en) * | 1989-09-22 | 1991-05-09 | Nippon Telegr & Teleph Corp <Ntt> | Mobile communication control system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4828359A (en) * | 1986-01-09 | 1989-05-09 | Sumitomo Electric Industries, Ltd. | Alkyl methacrylate homo - or copolymer optical waveguide for illumination and production of the same |
| KR100342633B1 (en) * | 1998-10-26 | 2002-07-04 | 가네꼬 히사시 | Mobile communication system capable of reducing a traffic between a control station and base stations |
| KR20000039980A (en) * | 1998-12-16 | 2000-07-05 | 김영환 | Method for transmitting multi-message between service control part and subscriber registration part of communication system |
| KR100426774B1 (en) * | 1998-12-16 | 2004-06-12 | 엘지전자 주식회사 | How to handle supplementary service messages at the exchange |
| US6963746B2 (en) | 2001-06-27 | 2005-11-08 | Fujitsu Limited | Radio base station transceiver sub-system |
| US7448166B2 (en) | 2005-02-14 | 2008-11-11 | Toyota Motor Engineering & Manufacturing North America, Inc. | Cable guide mechanism for luggage handles |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2972446B2 (en) | 1999-11-08 |
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