JPH03268626A - Intermittent reception system in mobile communication - Google Patents
Intermittent reception system in mobile communicationInfo
- Publication number
- JPH03268626A JPH03268626A JP2067247A JP6724790A JPH03268626A JP H03268626 A JPH03268626 A JP H03268626A JP 2067247 A JP2067247 A JP 2067247A JP 6724790 A JP6724790 A JP 6724790A JP H03268626 A JPH03268626 A JP H03268626A
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- Prior art keywords
- signal
- group
- timing
- mobile
- mobile set
- 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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Links
- 238000010295 mobile communication Methods 0.000 title claims description 4
- 230000008054 signal transmission Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 abstract description 41
- 230000003213 activating effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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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Abstract
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。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an intermittent reception method for reducing power consumption of a mobile device in a communication system that transmits signals from a base station to a mobile device. The present invention relates to an intermittent reception method that further improves the power consumption reduction effect of a mobile device by dividing the mobile device 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] In mobile phones and radio paging receivers (hereinafter referred to as mobile devices), reducing power consumption is an important technique for downsizing the mobile devices.
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 mobile devices into multiple groups, limits the timing of signal transmission from the base station to each group's mobile devices to specific timings, and allows mobile devices to turn on their power only during the timing of signal transmission for their own group. However, it is turned off at other times.
今１、ｌＯ群分割を例に第４図をもとに説明する。Now, 1. An explanation will be given based on FIG. 4 using 1O group division as an example.
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。This shows the signal transmission timing for the mobile stations of the 1st group to the 10th group, and by transmitting signals from the 1st group to the 10th group in order, one or more mobile stations belonging to each group The 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。In this manner, signals to the mobile stations of the first group to the tenth group are repeatedly transmitted. The i-th group of mobile devices is powered on and operated only at the i-th group's signal transmission timing. 6 in the figure indicates the timing of turning on and off the power of the second group of mobile stations.
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１群の信号
の７の部分は第１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 signals for each group, where 7 is a mobile group identification code and 8 is a transmission signal to the mobile devices. Part 7 of the first group of signals is encoded to indicate that it is a signal for the first 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
の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。[Problem to be solved by the invention] If the rate at which the power consumption of the receiver section of a mobile device can be reduced by performing intermittent reception is called the discontinuous reception rate, then in a system divided into N groups, the discontinuous reception The ratio is 1/N. However, in actual cases, it is necessary to turn on the power slightly before the signal transmission timing for the own group in order to start up the receiver circuit and establish bit synchronization, but here we will use this to simplify the explanation. I will ignore it.
間欠受信率を小さくするためには、群分は数を大きくす
る必要がある。しかし、群分は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、群分は数を一定
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, the delay in signal transmission to the mobile device increases. Conversely, in order to keep the delay below a certain value, it is necessary to keep the number of groups below a certain value, and as a result, there is a problem in that the intermittent reception rate cannot be made sufficiently small.
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
。SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide an intermittent reception method that can reduce the intermittent reception rate to 1/N or more 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 objects are achieved by the means described in the claims.
すなわち、本発明は、複数の移す機と少なくとも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、自群あての信号の送出タイ
ミングであっても、基地局から伝送された信号の有無ま
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
タイミング以外の時間では受信機の電源をオフにする如
く制御する間欠受信方式［作 用コ
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。That is, the present invention provides a mobile communication system that includes a plurality of mobile devices and at least one base station, in which the mobile devices are divided into a plurality of groups, and the base station predicts the signal transmission timing for the mobile devices for each group. At the same time, it sends out a code indicating the presence or absence of a signal to be transmitted to the mobile terminal or the number of signals to be transmitted to the mobile terminal during the signal transmission timing. On the other hand, the mobile station turns off the power of the receiver at times other than the timing when the signal destined for its own group is sent out, and even when the timing of sending the signal destined for its own group An intermittent reception system that controls the power of the receiver to be turned off at times other than the signal transmission timing predicted by a code that foretells the presence or absence of signals transmitted from the station or the number of signals. A code is added to the beginning of the transmission signal for the mobile device to identify whether or not the subsequent portion contains a transmission signal for the mobile device, and the mobile device identifies this code and determines whether the subsequent portion does not contain the transmission signal. The most important feature is to immediately turn off the power if it is found to be the case.
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 conventional technology, there was no way to know even if a transmission signal was not included in the subsequent part, so the power was kept on during the transmission timing of the own group. Even at the transmission timing, if there is no transmission signal, 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。Irregularities in transmission signals, which form the background of the present invention, will be explained 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ツセージ信
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。In the case of a radio call, the transmission signal for a mobile device referred to here is a paging signal or a paging signal and a message signal, and in the case of a mobile phone, it is a paging signal to the mobile phone. Since these signals are dialed by an unspecified number of telephone subscribers to make a radio call or a call to a mobile phone, the transmission signals to different mobile stations arrive and are transmitted randomly.
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。Therefore, in some cases, the number of signals to be transmitted for 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 0. is 4
More signals may arrive than can be processed. If more signals arrive than can be processed, the unprocessed signals wait until the next first group signal transmission timing and are processed at this timing.
第１群以外の信号も同様である。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。Furthermore, the frequency of arrival of transmission signals to a mobile device generally has a temporal peak, and the arrival frequency is low outside of peak hours such as late at night or early in the morning, meaning that there are only rarely transmission signals, which greatly increases the effect of the present invention. 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ビツトの長
さの符号となる。[Example] FIG. 1 is a diagram illustrating a first example of the present invention,
Numeral 9 is a blockage identification code indicating whether or not a transmission signal for the mobile device is included in the portion of the transmission signal 8 for the mobile device. The mobile unit group identification code 7 is, for example, a binary coded version of the mobile unit group code, and is a 4-bit code in the case of division into 10 groups. For example, 9 is a 1-bit code encoded as 1 when there is a transmission signal in 8, and as 0 when there is no transmission signal. If the number of radio paging receivers or mobile telephones to be called is, for example, one million, then 8 is a code with a length of 20 bits.
無線呼出しにメツセージも伝送する場合は、メツセージ
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。If a message is also transmitted with the radio call, the length of the message will be longer. If there is no signal to be transmitted at 8, for example, a useless code that does not correspond to a paging signal of any mobile device is transmitted at that timing.
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 explaining the intermittent reception operation of the mobile device,
10 is the power on/off timing of the second group mobile station.
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。In addition, in the figure, the transmission timings 2 and 5 are the timings for transmitting the transmission signals to the second group mobile station, but 2 has no signal to be transmitted, and 5 has a signal to transmit. do. The second group mobile station turns on the power from this first timing, decodes the mobile station group identification code 7, and confirms that it displays "2", that is, it is the transmission timing of the own group signal. After confirming this, the blockage identification code 9 is decoded. 9 in the timing of 2 is “0”
", so when the mobile device decodes 9, it knows that the following 8 does not contain a transmission signal, so it immediately turns off the power.
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
「ＩＪ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 device turns on the power again at the beginning of signal transmission timing 5, which is delayed by one cycle from timing 2, and decodes signals 7 and 9 from among the signals. 9 is encoded in IJ, so the mobile device knows that the transmission signal is included in the following 8, and decodes 8. After this, the next second group moves from the last timing of 5. Turn off the power until the beginning of the aircraft signal transmission timing.
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。FIG. 3 is a diagram for explaining the second embodiment, and 8-1.
8-2.8-3.8-4 is a transmission signal to a mobile device, and is an example of a case where transmission signals to four mobile devices are included in one signal transmission timing. If there are four transmission signals in the signal transmission timing, 8-1
゜8-2.8-3. All of 8-4 become transmission signals.
４つ以下の場合には先頭部分から伝送信号を伝送する。If there are four or less, the transmission signal is transmitted from the beginning.
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。For example, if the number of transmission signals is 2, 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ビツトで構成する。移動機は自群の
償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 blockage identification code 9 is a code of the number of transmission signals included in this signal transmission timing. for example,
In the case of FIG. 3, it is composed of 3 bits. The mobile unit turns on the power at the beginning of the code transmission timing of its own group, decodes 7, confirms that it is the signal transmission timing for the mobile unit of its own group, decodes 9, and includes it in the subsequent timing part. Know the number of transmitted signals that will be transmitted. Next, the power is turned on up to the transmission signal portion corresponding to this number, and then the power is turned off. For example, when 9 is "0", the power is turned off immediately after 9, but when it is "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 explained above, in the present invention, mobile stations divided into groups turn on their receivers only at the signal transmission timing for their own group and when a transmission signal is included in the signal transmission timing. Therefore, there is an advantage that the intermittent reception rate can be reduced and the power consumption of the mobile device can be further reduced.
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＊ｔの例を示す図である。2 is a diagram illustrating the timing of turning on and off the power of a mobile device, FIG. 3 is a diagram illustrating an example of the configuration of a transmission signal according to the second embodiment of the present invention, and FIG. 4 is a diagram illustrating an example of the configuration. FIG. 5, which is a diagram illustrating power on/off in conventional intermittent reception, is a diagram showing an example of *t of a signal in the conventional system.
１．２，３，４．５・・・・・・信号伝送タイミング、
６、ｌＯ・・・・・・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1.2, 3, 4.5... Signal transmission timing,
6, lO...Power on/off timing, 7...
...Mobile group identification code, 8.8-1.8-2.8-
3゜8-4...Transmission signal to mobile device, 9.
...Air block identification code
Claims (1)
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であっても、基地局から伝
送された信号の有無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以外の時間では受信
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
る間欠受信方式。[Claims] In a mobile communication system consisting of a plurality of mobile devices and at least one base station, the mobile devices are divided into a plurality of groups, and the base station gives advance notice of signal transmission timing to the mobile devices of each group. At the same time, it sends out a code indicating the presence or absence of a signal to be transmitted to the mobile terminal or the number of signals to be transmitted to the mobile terminal during the signal transmission timing. On the other hand, the mobile station turns off the power of the receiver at times other than the timing when the signal destined for its own group is sent out, and even when it is the timing to send the signal destined for its own group, the mobile station An intermittent reception method in mobile communications characterized by a code that foretells the presence or absence of a signal transmitted from a receiver or the number of signals transmitted from the receiver, thereby turning off the power of the receiver at times other than the signal transmission timing that has been predicted.
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 |
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| Publication Number | Publication Date |
|---|---|
| JPH03268626A true JPH03268626A (en) | 1991-11-29 |
| JP3190030B2 JP3190030B2 (en) | 2001-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06724790A Expired - Lifetime JP3190030B2 (en) | 1990-03-19 | 1990-03-19 | Intermittent reception method in mobile communication |
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| JP (1) | JP3190030B2 (en) |
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| EP0796025A2 (en) * | 1996-03-12 | 1997-09-17 | Ntt Mobile Communications Network Inc. | 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 |
| US8023475B2 (en) | 2002-05-06 | 2011-09-20 | Interdigital Technology Corporation | Synchronization for extending battery life |
| US8144637B2 (en) | 2002-05-01 | 2012-03-27 | Interdigital Technology Corporation | Method and system for optimizing power resources in wireless devices |
| US8315659B2 (en) | 1997-08-15 | 2012-11-20 | Qualcomm Incorporated | Method and apparatus for providing broadcast messages in a communications network |
| WO2013137036A1 (en) * | 2012-03-15 | 2013-09-19 | 株式会社国際電気通信基礎技術研究所 | Transmitter, transmission method for same, receiver for receiving wireless signal from transmitter, and wireless communication system provided with transmitter and receiver |
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| EP0796025A3 (en) * | 1996-03-12 | 1999-09-29 | Ntt Mobile Communications Network Inc. | Scheme for intermittent reception of paging signals in mobile communication system |
| EP0796025A2 (en) * | 1996-03-12 | 1997-09-17 | Ntt Mobile Communications Network Inc. | Scheme for intermittent reception of paging signals in mobile communication system |
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| US8144637B2 (en) | 2002-05-01 | 2012-03-27 | Interdigital Technology Corporation | Method and system for optimizing power resources in wireless devices |
| US9603149B2 (en) | 2002-05-01 | 2017-03-21 | Interdigital Technology Corporation | Method and system for optimizing power resources in wireless devices |
| US10117182B2 (en) | 2002-05-01 | 2018-10-30 | Interdigital Technology Corporation | Communicating control messages that indicate frequency resource information to receive data |
| US8625545B2 (en) | 2002-05-06 | 2014-01-07 | Interdigital Technology Corporation | Synchronization for extending battery life |
| US8023475B2 (en) | 2002-05-06 | 2011-09-20 | Interdigital Technology Corporation | Synchronization for extending battery life |
| US9730158B2 (en) | 2002-05-06 | 2017-08-08 | Interdigital Technology Corporation | Synchronization for extending battery life |
| US10356718B2 (en) | 2002-05-06 | 2019-07-16 | Interdigital Technology Corporation | Synchronization for extending battery life |
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| JPWO2013137036A1 (en) * | 2012-03-15 | 2015-08-03 | 株式会社国際電気通信基礎技術研究所 | Transmitter, transmission method therefor, receiver for receiving radio signal from transmitter, and radio communication system including them |
| 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 |
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| Publication number | Publication date |
|---|---|
| JP3190030B2 (en) | 2001-07-16 |
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