JP3190030B2 - Intermittent reception method in mobile communication - Google Patents
Intermittent reception method in mobile communicationInfo
- Publication number
- JP3190030B2 JP3190030B2 JP06724790A JP6724790A JP3190030B2 JP 3190030 B2 JP3190030 B2 JP 3190030B2 JP 06724790 A JP06724790 A JP 06724790A JP 6724790 A JP6724790 A JP 6724790A JP 3190030 B2 JP3190030 B2 JP 3190030B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- group
- mobile
- transmission
- transmitted
- 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.)
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、基地局から移動機に信号を伝送する通信シ
ステムにおける、移動機の消費電力低減のための間欠受
信方式に関し、特に移動機を複数の群に群分けすること
により、移動機の消費電力の低減効果をより向上せしめ
た間欠受信方式に係る。Description: TECHNICAL FIELD The present invention relates to an intermittent reception system for reducing power consumption of a mobile station in a communication system for transmitting a signal from a base station to the mobile station. The present invention relates to an intermittent reception system in which the effect of reducing the power consumption of a mobile device is further improved by grouping into a plurality of groups.
［従来の技術］ 携帯電話機や無線呼出し受信機（以下移動機という）
では、消費電力の低減が移動機小型化のための重要な技
術である。[Prior Art] Mobile phones and paging receivers (hereinafter referred to as mobile devices)
Then, reduction of power consumption is an important technology for downsizing a mobile device.
消費電力低減の方法としては、いわゆる間欠受信方式
がある。これは移動機を複数の群に群分けし、基地局か
ら各群移動機に対する信号伝送のタイミングを特定のタ
イミングに限定し、移動機は自分の群に対する信号伝送
のタイミングの間だけ電源をオンし、その他のタイミン
グではオフとするものである。As a method of reducing power consumption, there is a so-called intermittent reception method. This divides the mobile stations into a plurality of groups, limits the timing of signal transmission from the base station to each group mobile station to a specific timing, and turns on the power only during the timing of signal transmission to its own group. It is turned off at other timings.
今、10群分割を例に第４図をもとに説明する。これは
第１群〜第10群の移動機に対する信号伝送タイミングを
示しており、このように１群から10群まで順々に送信さ
れることにより、それぞれの群に属する１つまたは複数
の移動機に対する信号が伝送される。Now, description will be made with reference to FIG. This indicates the signal transmission timing for the mobile units of the first group to the tenth group. One or a plurality of mobile stations belonging to each group are transmitted by sequentially transmitting the signals from the first group to the tenth group. A signal to the machine is transmitted.
そして、このようにして第１群〜第10群移動機に対す
る信号が繰返して伝送される。第ｉ群の移動機は第ｉ群
の信号伝送タイミングだけ電源をオンとして動作させ
る。同図中の６は第２群移動機の電源オン、オフのタイ
ミングを示したものである。Then, signals to the first to tenth mobile units are repeatedly transmitted in this manner. The i-th mobile unit is operated with the power turned on only for the i-th group signal transmission timing. Reference numeral 6 in the figure indicates the power on / off timing of the second group mobile unit.
第５図は各群用信号の構成例であって、７は移動機群
識別符号、８は移動機への伝送信号である。第ｉ群の信
号の７の部分は第ｉ群用の信号であることを示すよう符
号化されている。FIG. 5 shows an example of the configuration of each group signal, where 7 is a mobile station group identification code, and 8 is a transmission signal to the mobile station. The 7th part of the signal of the ith group is coded to indicate that it is a signal for the ith group.
［発明が解決しようとする課題］ 間欠受信をすることにより、移動機の受信機部分の消
費電力を低減できる割合を間欠受信率と呼ぶことにすれ
ば、Ｎ群に群分けしたシステムでは間欠受信率は1/Nと
なる。但し、実際の場合では、受信機回路の立上りやビ
ット同期確立のため自群用信号伝送タイミングの若干前
とタイミングで電源をオンとする必要があるが、ここで
は説明を簡単にするためこれを無視することとする。[Problems to be Solved by the Invention] If the rate at which the power consumption of the receiver part of the mobile station can be reduced by performing the intermittent reception is called an intermittent reception rate, the system divided into N groups can perform the intermittent reception. The rate is 1 / N. However, in an actual case, it is necessary to turn on the power a little before and before the self-group signal transmission timing for the rise of the receiver circuit and the establishment of the bit synchronization. Ignore it.
間欠受信率を小さくするためには、群分け数を大きく
する必要がある。しかし、群分け数を大きくすると移動
機に対する信号伝送の遅延が大きくなる欠点がある。逆
に遅延を一定値以下にとどめるためには、群分け数を一
定値以下にする必要があり、この結果間欠受信率を十分
小さくできないと言う問題点があった。In order to reduce the intermittent reception rate, it is necessary to increase the number of groups. However, when the number of groups is increased, there is a disadvantage that the delay of signal transmission to the mobile device increases. Conversely, in order to keep the delay below a certain value, it is necessary to make the number of groups smaller than a certain value, and as a result, there is a problem that the intermittent reception rate cannot be sufficiently reduced.
本発明は、このような従来の問題点に鑑み、信号伝送
の遅延を増大させることなく、間欠受信率を1/Nより低
減可能な間欠受信方式を提供することを目的としてい
る。The present invention has been made in view of such a conventional problem, and has as its object to provide an intermittent reception system capable of reducing an intermittent reception rate to less than 1 / N without increasing signal transmission delay.
［課題を解決するための手段］ 本発明によれば、上述の目的は、前記特許請求の範囲
に記載された手段により達成される。[Means for Solving the Problems] According to the present invention, the above-mentioned object is achieved by the means described in the claims.
すなわち、本発明は、複数の移動機と少なくとも１つ
の基地局によって構成される移動通信方式において、移
動機を複数の群に分け、基地局が各群用の移動機に対す
る信号伝送タイミングを予告する符号を送出するととも
に、その信号伝送タイミング中に移動機に伝送すべき信
号の有無または信号数を予告する符号を送出し、これに
基づいて各群ごとに予告したタイミングで予告した数の
移動機あての伝送信号を送出し、一方、移動機は自群あ
ての信号の送出タイミング以外の時間についての受信機
の電源をオフにするとともに、自群あての信号の一部を
受信して、基地局から伝送された信号の有無を予告する
符号が無を示していることを認識したとき、または信号
数を予告する符号によって予告された信号伝送タイミン
グが経過したとき、受信機の電源をオフにする如く制御
する間欠受信方式である。That is, according to the present invention, in a mobile communication system configured by a plurality of mobile stations and at least one base station, the mobile stations are divided into a plurality of groups, and the base station notifies the signal transmission timing to the mobile stations for each group. At the same time as transmitting the code, the mobile station transmits a code for notifying the presence or absence of the signal to be transmitted to the mobile station or the number of signals to be transmitted to the mobile station during the signal transmission timing. The mobile station transmits a transmission signal addressed to the mobile station, while the mobile station turns off the power of the receiver for a time other than the transmission timing of the signal addressed to its own group, receives a part of the signal addressed to its own group, and transmits the signal to the base station. When recognizing that the code for notifying the presence or absence of a signal transmitted from the station indicates nothing, or when the signal transmission timing notified by the code for notifying the number of signals elapses, The power of the signal unit is a discontinuous reception method for controlled as to turn off.
［作 用］ 本発明は、各群に対する伝送信号の先頭部分に、後続
部分に移動機に対する伝送信号が含まれているか否かを
識別する符号を付加し、移動機はこの符号を識別して後
続部分に伝送信号が含まれていないことが判明すれば、
直ちに電源をオフにすることを最も主要な特徴とする。[Operation] According to the present invention, a code for identifying whether or not a transmission signal for a mobile device is included in a subsequent portion is added to a leading portion of a transmission signal for each group, and the mobile device identifies this code. If it turns out that the subsequent part does not contain the transmitted signal,
The main feature is to turn off the power immediately.
従来の技術では、後続部分に伝送信号が含まれていな
い場合でもこれを知る手段がなかったから、自群の伝送
タイミングの間はずっと電源をオンにしていたのに対し
て、本発明では自群伝送タイミングであっても伝送信号
がない場合には電源をオフにすることが可能となる。In the prior art, there was no means to know even if the transmission signal was not included in the succeeding part, so the power was always turned on during the transmission timing of the own group. If there is no transmission signal even at the transmission timing, the power can be turned off.
本発明の背景となっている伝送信号の不規則性につい
て以下に説明する。The irregularity of the transmission signal as the background of the present invention will be described below.
ここで言う移動機に対する伝送信号とは、無線呼出し
の場合には、呼出し信号または呼出し信号とメッセージ
信号であり、携帯電話の場合は携帯電話機への呼出し信
号である。これらの信号は不特定多数の電話加入者がダ
イヤルすることにより無線呼出しや携帯電話を呼出すも
のであるから、異なる移動機に対する伝送信号はランダ
ムに到着し、伝送される。The transmission signal to the mobile station mentioned here is a paging signal or a paging signal and a message signal in the case of wireless paging, and a paging signal to a mobile phone in the case of a mobile phone. Since these signals are for calling a wireless call or a portable telephone by an unspecified number of telephone subscribers dialing, transmission signals for different mobile units arrive at random and are transmitted.
このため、ある場合には第４図の１から３までの間に
到着した第１群に対して伝送すべき信号の数が０である
こともあるし、逆に第１群の信号伝送タイミングである
４で処理し切れる数以上の信号が到着することがある。
処理しきれる数以上の信号が到着した場合には、処理し
きれなかった信号はその次の第１群信号伝送タイミング
まで待ってこのタイミングで処理される。第１群以外の
信号も同様である。Therefore, in some cases, the number of signals to be transmitted to the first group arriving between 1 and 3 in FIG. 4 may be 0, and conversely, the signal transmission timing of the first group may be zero. In some cases, more signals than the number of signals that can be processed in 4 may arrive.
If more signals than can be processed arrive, the unprocessed signals are processed at this timing after waiting for the next first group signal transmission timing. The same applies to signals other than the first group.
また、移動機に対する伝送信号の到着頻度は一般に時
間的なピークがあり、夜中や早朝等ピーク時間帯意外で
は到着頻度は低く、まれにしか伝送信号がないことにな
り、本発明の効果が大きくなる。In addition, the frequency of arrival of a transmission signal to a mobile device generally has a temporal peak, and the arrival frequency is low outside a peak time zone such as at midnight or early morning, and the transmission signal is rarely present. Become.
［実施例］ 第１図は本発明の第一の実施例を説明する図であっ
て、数字符９は移動機に対する伝送信号８の部分に移動
機に対する伝送信号が含まれているか否かを示す空塞識
別符号である。移動機群識別符号７は、例えば、移動機
群符号を２進符号化したものであり、10群分けの場合に
は４ビット符号となる。９は、例えば、８に伝送信号が
ある場合は１、ない場合は０に符号化した１ビット符号
である。呼び出すべき無線呼出し受信機数または携帯電
話機数を、例えば100万とすると、８は20ビットの長さ
の符号となる。無線呼出しにメッセージも伝送する場合
は、メッセージ分だけさらに長くなる。８に伝送すべき
信号がない場合には、そのタイミングでは、例えば、ど
の移動機の呼出し信号にも相当しない無駄符号を伝送す
る。Embodiment FIG. 1 is a diagram for explaining a first embodiment of the present invention. Numerals 9 indicate whether or not a transmission signal 8 for a mobile station includes a transmission signal for a mobile station. This is the empty / busy identification code shown. The mobile station group identification code 7 is, for example, a binary code of the mobile station group code, and is a 4-bit code in the case of ten groups. Reference numeral 9 denotes a 1-bit code that is coded to 1 when there is a transmission signal in 8 and to 0 when there is no transmission signal. Assuming that the number of radio paging receivers or mobile phones to be called is, for example, one million, 8 is a code having a length of 20 bits. If a message is also transmitted to the radio call, it will be longer by the message. If there is no signal to be transmitted to 8, for that timing, for example, a useless code that does not correspond to a paging signal of any mobile station is transmitted.
第２図は移動機の間欠受信動作を説明する図であっ
て、10は第２群移動機の電源オンオフタイミングであ
る。FIG. 2 is a diagram for explaining the intermittent reception operation of the mobile device, and reference numeral 10 denotes a power on / off timing of the second group mobile device.
また、同図において、２および５の伝送タイミングは
第２群移動機に対する伝送信号を伝送するタイミングで
あるが、２には伝送すべき信号がなく、５には伝送すべ
き信号があるものとする。第２群移動機はこの先頭のタ
イミングから電源をオンとし、移動機群識別符号７を復
号してそれが「２」を表示していること、すなわち、自
群用信号の伝送タイミングであることを確認してから空
塞識別符号９を復号する。２のタイミングの中の９は
「０」と符号化されているから、移動機は９を復号した
ときに以降の８の中には伝送信号が含まれていないこと
が判るから、直ちに電源をオフにする。Also, in the figure, the transmission timings of 2 and 5 are timings for transmitting the transmission signal to the second group mobile unit. It is assumed that 2 has no signal to be transmitted and 5 has a signal to be transmitted. I do. The power supply of the second group mobile unit is turned on from the first timing, and the mobile unit group identification code 7 is decoded to indicate "2", that is, the transmission timing of the own group signal. Is confirmed, and the empty / busy identification code 9 is decoded. Since 9 in the timing of 2 is coded as “0”, the mobile station determines that no transmission signal is included in the subsequent 8 when decoding 9, so the power supply is immediately turned off. Turn off.
次に移動機は２のタイミングから１周期分だけ遅れた
信号伝送タイミング５の先頭のタイミングで再び電源を
オンにし、この中の信号から７および９を復号する。９
は「１」に符号化されているから移動機は以降の８の中
に伝送信号が含まれていることを知り、８を復号する。
このあと５の最後のタイミングから次の第２群移動機用
信号伝送タイミングの先頭まで電源をオフにする。Next, the mobile station turns on the power again at the first timing of signal transmission timing 5 which is delayed by one cycle from timing 2 and decodes 7 and 9 from the signals therein. 9
Is encoded into "1", the mobile device knows that the following 8 contains a transmission signal and decodes 8.
Thereafter, the power is turned off from the last timing of 5 to the beginning of the next signal transmission timing for the second group mobile unit.
第３図は第２の実施例を説明する図であって、８−1,
8−2,8−3,8−４は移動機に対する伝送信号であり、１
つの信号伝送タイミングの中に４つの移動機に対する伝
送信号が含まれている場合の例である。信号伝送タイミ
ングの中に４つの伝送信号がある場合は、８−1,8−2,8
−3,8−４の全てが伝送信号となる。４つ以下の場合に
は先頭部分から伝送信号を伝送する。例えば、伝送信号
の数が２の場合は８−１および８−２でこれを伝送し、
８−３と８−４は無駄符号とする。FIG. 3 is a diagram for explaining the second embodiment, in which 8-1,
8-2, 8-3, 8-4 are transmission signals to the mobile station,
This is an example in which transmission signals for four mobile stations are included in one signal transmission timing. If there are four transmission signals in the signal transmission timing, 8-1,8-2,8
All of -3 and 8-4 become transmission signals. If the number is four or less, the transmission signal is transmitted from the head. For example, when the number of transmission signals is 2, the transmission signals are transmitted in 8-1 and 8-2,
8-3 and 8-4 are useless codes.
空塞識別符号９は、この信号伝送タイミング中に含ま
れている伝送信号の数を符号化したものである。例え
ば、第３図の場合には３ビットで構成する。移動機は自
群の信号伝送タイミングの先頭で電源をオンにして７を
復号して自群移動機に対する信号伝送タイミングである
ことを確認したあと９を復号し、以降のタイミングの部
分に含まれる伝送信号の数を知る。次にこの数に相当す
る伝送信号部分まで電源をオンとしてから電源をオフに
する。例えば、９が「０」のときは９のあと直ちに電源
をオフにするが、「２」の場合は８−２の最後を受信し
たあとで電源をオフにする。The occupancy code 9 encodes the number of transmission signals included in the signal transmission timing. For example, in the case of FIG. 3, it is composed of three bits. The mobile station turns on the power at the head of the signal transmission timing of the own group, decodes 7 and confirms that it is the signal transmission timing for the own group mobile station, and then decodes 9 and is included in the subsequent timing part. Know the number of transmitted signals. Next, the power is turned on until the transmission signal portion corresponding to this number is turned on, and then the power is turned off. For example, when 9 is "0", the power is turned off immediately after 9, but when "2", the power is turned off after receiving the last of 8-2.
［発明の効果］ 以上説明したように、本発明においては群分けされた
移動機は自群用の信号伝送タイミングでかつ、その中に
伝送信号が含まれている場合だけ受信機をオンにしてい
るので、間欠受信率を小さくし、従って移動機の消費電
力をより低減できる利点がある。[Effects of the Invention] As described above, according to the present invention, mobile devices that are grouped are turned on only at the signal transmission timing for the own group and only when the transmission signal is included in the mobile devices. Therefore, there is an advantage that the intermittent reception rate can be reduced, and thus the power consumption of the mobile device can be further reduced.
第１図は本発明の第１の実施例の伝送信号の構成の例を
示す図、第２図は移動機の電源オンオフのタイミングを
説明する図、第３図は本発明の第２の実施例の伝送信号
の構成の例を示す図、第４図は従来の間欠受信における
電源オンオフについて説明する図、第５図は従来の方式
における信号の構成の例を示す図である。 1,2,3,4,5……信号伝送タイミング、6,10……電源オン
オフタイミング、７……移動機群識別符号、8,8−1,8−
2,8−3,8−４……移動機に対する伝送信号、９……空塞
識別符号FIG. 1 is a diagram showing an example of the configuration of a transmission signal according to a first embodiment of the present invention, FIG. 2 is a diagram for explaining the power on / off timing of a mobile station, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a diagram showing an example of a configuration of a transmission signal in the example, FIG. 4 is a diagram for explaining power on / off in a conventional intermittent reception, and FIG. 5 is a diagram showing an example of a signal configuration in a conventional system. 1,2,3,4,5 ... signal transmission timing, 6,10 ... power on / off timing, 7 ... mobile station group identification code, 8,8-1,8-
2,8-3,8-4 ... Transmission signal to mobile unit, 9 ... Buss identification code
───────────────────────────────────────────────────── フロントページの続き 合議体 審判長 松野 高尚 審判官 大橋 隆夫 審判官 橋本 正弘 (56)参考文献 特開 昭58−124338（ＪＰ，Ａ) 特開 昭62−266932（ＪＰ，Ａ) 特開 昭64−7742（ＪＰ，Ａ) 特開 平１−170129（ＪＰ，Ａ) 特開 平１−265732（ＪＰ，Ａ) 特開 平１−170131（ＪＰ，Ａ) 特開 平２−26137（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page Judge Takao Matsuno Judge Takao Ohashi Judge Masahiro Hashimoto (56) References JP-A-58-124338 (JP, A) JP-A-62-266932 (JP, A) JP JP-A 64-7742 (JP, A) JP-A-1-170129 (JP, A) JP-A-1-265732 (JP, A) JP-A-1-170131 (JP, A) JP-A-2-26137 (JP) , A)
Claims (1)
よって構成される移動通信方式において、 移動機を複数の群に分け、 基地局が各群用の移動機に対する信号伝送タイミングを
予告する符号を送出するとともに、 その信号伝送タイミング中に移動機に伝送すべき信号が
存在するか否かを示す１ビットの符号または伝送すべき
信号の信号数を予告する符号を送出し、 これに基づいて各群ごとに予告したタイミングで予告し
た数の移動機あての伝送信号を送出し、 一方、移動機は自群あての信号の送出タイミング以外の
時間について受信機の電源をオフにするとともに、 自群あての信号の送出タイミングに自群あての信号の一
部を受信して、基地局から伝送された前記信号の伝送を
予告する符号が伝送すべき信号が存在しないことを示し
ていることを認識したとき、または信号数を予告する符
号によって予告された信号伝送タイミングが経過したと
き、受信機の電源をオフにすることを特徴とする移動通
信における間欠受信方法。1. A mobile communication system comprising a plurality of mobile stations and at least one base station, wherein the mobile stations are divided into a plurality of groups, and the base station notifies a signal transmission timing to each group of mobile stations. And a 1-bit code indicating whether or not there is a signal to be transmitted to the mobile station during the signal transmission timing or a code for notifying the number of signals to be transmitted. At the timing announced for each group, the number of transmission signals destined for the mobile station is transmitted, and at the same time, the mobile station turns off the power of the receiver at times other than the transmission timing of the signal destined for its own group, and A part of the signal addressed to the own group is received at the transmission timing of the signal addressed to the group, and a code for announcing the transmission of the signal transmitted from the base station indicates that there is no signal to be transmitted. When it recognizes that you are, or when the signal transmission timing foretold by the code to notice the number of signals has passed, an intermittent reception method in a mobile communication, characterized in that to turn off the receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06724790A JP3190030B2 (en) | 1990-03-19 | 1990-03-19 | Intermittent reception method in mobile communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06724790A JP3190030B2 (en) | 1990-03-19 | 1990-03-19 | Intermittent reception method in mobile communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03268626A JPH03268626A (en) | 1991-11-29 |
| JP3190030B2 true JP3190030B2 (en) | 2001-07-16 |
Family
ID=13339405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06724790A Expired - Lifetime JP3190030B2 (en) | 1990-03-19 | 1990-03-19 | Intermittent reception method in mobile communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3190030B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2199661C (en) * | 1996-03-12 | 2001-08-14 | Takehiro Nakamura | Scheme for intermittent reception of paging signals in mobile communication system |
| WO1999016190A1 (en) * | 1996-03-22 | 1999-04-01 | Matsushita Electric Industrial Co., Ltd. | Equipment and method for radio communication |
| US8315659B2 (en) | 1997-08-15 | 2012-11-20 | Qualcomm Incorporated | Method and apparatus for providing broadcast messages in a communications network |
| US6950684B2 (en) | 2002-05-01 | 2005-09-27 | Interdigital Technology Corporation | Method and system for optimizing power resources in wireless devices |
| CN1653733B (en) | 2002-05-06 | 2011-07-06 | 美商内数位科技公司 | Method used in wireless transmitting or receiving unit |
| US9532379B2 (en) | 2012-03-15 | 2016-12-27 | Advanced Telecommunications Research Institute Int | Transmitter, transmission method used by the same, receiver for receiving a radio signal from transmitter and wireless communication system including the same |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124338A (en) * | 1982-01-20 | 1983-07-23 | Nec Corp | Selective calling communication system |
| JPH06101700B2 (en) * | 1986-05-15 | 1994-12-12 | 株式会社東芝 | Battery saving method |
| JP2551591B2 (en) * | 1987-06-30 | 1996-11-06 | 日本電気株式会社 | Intermittent reception method |
| JP2581719B2 (en) * | 1987-12-25 | 1997-02-12 | 日本電信電話株式会社 | Selective call communication method |
| JPH0773380B2 (en) * | 1987-12-25 | 1995-08-02 | 日本電信電話株式会社 | Selective call communication method |
| JPH01265732A (en) * | 1988-04-18 | 1989-10-23 | Toshiba Corp | Selective call system |
| JPH0226137A (en) * | 1988-07-15 | 1990-01-29 | Nippon Telegr & Teleph Corp <Ntt> | Radio calling receiver |
-
1990
- 1990-03-19 JP JP06724790A patent/JP3190030B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03268626A (en) | 1991-11-29 |
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