JP2002152129A - Radio communication method - Google Patents
Radio communication methodInfo
- Publication number
- JP2002152129A JP2002152129A JP2000348303A JP2000348303A JP2002152129A JP 2002152129 A JP2002152129 A JP 2002152129A JP 2000348303 A JP2000348303 A JP 2000348303A JP 2000348303 A JP2000348303 A JP 2000348303A JP 2002152129 A JP2002152129 A JP 2002152129A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- station
- communication method
- terminal
- wireless communication
- 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
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、デジタル無線通信
に用いられる基地局従属方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station dependent system used for digital radio communication.
【０００２】[0002]
【従来の技術】デジタル無線システムは、一般に１つの
基地局と複数の端末局とから構成される。各々の端末局
は、基地局が有するタイミングに対して同期をとること
により、同時に複数の回線を確保する多重接続が実現さ
れている。このことを、多元接続方式の１つであるTDMA
（Time Division Multiple Access：時分割多重）を例
にとり、図５によって多重システムの概念を説明する。2. Description of the Related Art A digital radio system generally comprises one base station and a plurality of terminal stations. Each terminal station synchronizes with the timing of the base station, thereby realizing multiple access for simultaneously securing a plurality of lines. This is called TDMA, one of the multiple access methods.
Taking (Time Division Multiple Access) as an example, the concept of a multiplex system will be described with reference to FIG.
【０００３】図５は、TDMAシステムにおいて２つの端末
局と基地局間で通信が行われている様子を示す図であ
る。101は基地局、102は端末局A、103は端末局B、104-1
は基地局101から端末局A102に送信される下り信号、104
-2は基地局101から端末局B103に送信される下り信号、1
05-1は端末局A102から基地局101に送信される上り信
号、105-2は端末局B103から基地局101に送信される上り
信号である。図５において、無線キャリアを上り／下り
の一対の周波数で構成し、下り信号の周波数をF、上り
信号の周波数をfとしている。この一対の周波数につい
て、図６に示すような時間分割を行うことにより、多重
化が実現される。FIG. 5 is a diagram showing a state where communication is performed between two terminal stations and a base station in a TDMA system. 101 is a base station, 102 is a terminal station A, 103 is a terminal station B, 104-1
Is a downlink signal transmitted from the base station 101 to the terminal station A102, 104
-2 is a downlink signal transmitted from the base station 101 to the terminal station B103, 1
05-1 is an uplink signal transmitted from the terminal station A102 to the base station 101, and 105-2 is an uplink signal transmitted from the terminal station B103 to the base station 101. In FIG. 5, the radio carrier is composed of a pair of uplink and downlink frequencies, where the frequency of the downlink signal is F and the frequency of the uplink signal is f. Multiplexing is realized by performing time division as shown in FIG. 6 on the pair of frequencies.
【０００４】図６は、従来の時分割多重システムのスロ
ットを示す図である。図６では、多重数が４の場合の例
を示す。106は下り信号のフレーム区切り、107は上り信
号のフレーム区切り、108-1，2，3，4は下り信号のスロ
ット、109-1，2，3，4は上り信号のスロット、110は時
間軸である。図６において、下り方向（基地局101から
端末局A102または端末局B103への送信）の場合、１つの
無線キャリアを時間軸上でフレーム106に区切り、更に
フレーム106を多重数４に対応するスロット（SLOT1，SL
OT2，SLOT3，SLOT4）108-1，2，3，4に分割することに
より多重化を行う。なお、図６の例では、1フレームを4
0 msecとする。FIG. 6 is a diagram showing slots in a conventional time division multiplex system. FIG. 6 shows an example in which the number of multiplexes is four. 106 is a frame segment of a downlink signal, 107 is a frame segment of an uplink signal, 108-1, 2, 3, and 4 are slots of a downlink signal, 109-1, 2, 3, and 4 are slots of an uplink signal, and 110 is a time axis. It is. In FIG. 6, in the downlink direction (transmission from the base station 101 to the terminal station A 102 or the terminal station B 103), one radio carrier is divided into frames 106 on the time axis, and the frame 106 is divided into slots corresponding to four multiplexes. (SLOT1, SL
OT2, SLOT3, SLOT4) Perform multiplexing by dividing into 108-1, 2, 3, and 4. Note that in the example of FIG.
Set to 0 msec.
【０００５】スロット108-4は１つの制御チャネル（CC
H）に割り当て、スロット108-1，108-2，108-3は３つの
通信用チャネル（TCH1，TCH2，TCH3）に割り当ててい
る。制御チャネル（スロット108-4）は回線の接続制御
を行うチャネルであり、通信用チャネル（スロット108-
1，108-2，108-3）は通話及びデータ伝送などの通信を
行うチャネルである。基地局は、通常これらの全スロッ
トを常時送信する。一方上り方向では、下りのフレーム
106を基準とするフレームタイミング107をスロット109-
1，2，3，4に分割し、下りの場合と同様に、スロット10
9-4は１つの制御チャネル（CCH）に割り当て、スロット
109-1，109-2，109-3は３つの通信用チャネル（TCH1，T
CH2，TCH3）に割り当てている。端末局（端末局A102ま
たは端末局B103）は、制御チャネル（スロット109-
4）、あるいは基地局101により指定された通信チャネル
のスロット（スロット109-1，109-2，109-3のいずれか
１つ）のみを送信する。この図の例では、端末局A102は
スロット109-1、端末局Bはスロット109-2のタイミング
で送信する。[0005] Slot 108-4 has one control channel (CC).
H), and slots 108-1, 108-2, and 108-3 are allocated to three communication channels (TCH1, TCH2, and TCH3). The control channel (slot 108-4) is a channel for controlling connection of a line, and a communication channel (slot 108-
1, 108-2, 108-3) are channels for communication such as telephone conversation and data transmission. The base station normally transmits all these slots at all times. On the other hand, in the up direction, the down frame
Slot 109- frame timing 107 based on 106
It is divided into 1, 2, 3, and 4 and slot 10
9-4 is assigned to one control channel (CCH), slot
109-1, 109-2, 109-3 have three communication channels (TCH1, TCH1).
CH2, TCH3). The terminal station (terminal station A102 or terminal station B103) transmits a control channel (slot 109-
4) Alternatively, only the slot of the communication channel specified by the base station 101 (one of the slots 109-1, 109-2, and 109-3) is transmitted. In the example of this figure, the terminal station A102 transmits at the timing of the slot 109-1, and the terminal station B transmits at the timing of the slot 109-2.
【０００６】以上のように、複数の端末局が個々に基地
局によって指定されたスロットで上りの送信を行う多重
方式はTDMA(Time Division Multiple Access)と呼ぶ。
また、基地局が複数の端末局に対して割り当てたスロッ
トを通じて送信を行い、端末局が自局に割り当てられた
スロットを受信する方式をTDM(Time Division Multipl
e)と呼ぶ。このような、通信を行うための一般的な呼接
続手段について説明する。端末局発呼の場合、端末局は
制御チャネルに指定されているスロットで接続要求信号
を、例えば、1〜2フレーム送信し、接続要求信号を受信
した基地局は、通信用に割り当てられているスロットの
中から空いているスロットを通信用チャネルとして設定
すると同時に、端末局に対して制御チャネルを通じてこ
の設定を通知し、端末局の送信スロットを切換えさせ
る。一方、基地局発呼の場合、基地局は通信用チャネル
の空きチャネルの有無を調べ、空きチャネルが有る場
合、基地局から制御チャネルで対象となる端末局に対し
て呼び出し信号を送信し、その後、通信用チャネルの空
いているチャネルを当該通信用チャネルとして設定す
る。以上のようなシステムが成立するためには、各スロ
ット間の干渉を防止するために、端末局の送信スロット
タイミングの正確な制御が必要である。したがって、基
地局は常時制御チャネルを含む信号（制御チャネル信
号）を送信し続け、端末局が必要なときに随時この制御
チャネル信号を受信して、基地局に対してスロットタイ
ミングの同期をとることができるような状態を維持する
ことが必要となる。As described above, a multiplexing method in which a plurality of terminal stations individually perform uplink transmission in a slot designated by a base station is called TDMA (Time Division Multiple Access).
In addition, a method in which a base station transmits through a slot allocated to a plurality of terminal stations and a terminal station receives a slot allocated to its own station is referred to as TDM (Time Division Multipl
Call it e). A general call connection means for performing such communication will be described. In the case of a terminal station call, the terminal station transmits a connection request signal in the slot specified in the control channel, for example, 1 to 2 frames, and the base station that receives the connection request signal is allocated for communication. At the same time as setting a vacant slot among the slots as a communication channel, the terminal station is notified of this setting through a control channel, and the transmission slot of the terminal station is switched. On the other hand, in the case of a base station call, the base station checks the presence or absence of a vacant channel in the communication channel, and if there is a vacant channel, transmits a paging signal from the base station to the target terminal station on the control channel, and thereafter , And sets an unused communication channel as the communication channel. In order to realize the above system, accurate control of the transmission slot timing of the terminal station is required in order to prevent interference between slots. Therefore, the base station always transmits a signal including a control channel (control channel signal), and the terminal station receives the control channel signal as needed when necessary to synchronize the slot timing with the base station. It is necessary to maintain a state that can be performed.
【０００７】以上述べてきたような、基地局が常時送信
する基地局従属型の無線方式は、電波産業会標準規格AR
IB STD-27(デジタル方式自動車電話システム)やARIB ST
D-39(公共業務用デジタル移動通信システム)などのTDMA
システムで採用されている。また、TDMA以外のシステ
ム、例えばARIB STD-T61(狭帯域デジタル通信方式)で採
用されているSCPC/FDMA（Single Channel Per Carrier/
Frequency Division Multiple Access）システムにおい
ても、基地局が制御チャネルを常時送信しており、端末
局はこれを受信してフレームタイミングの同期を確立す
るとともに、周波数についても同期をとっている。これ
により、各端末局の送信周波数の精度を確保し、他のチ
ャネルとの干渉を抑止している。また、端末局が基地局
とフレーム同期をとることは、基地局の受信動作を容易
にする効果もある。As described above, the base station-dependent wireless system in which the base station constantly transmits data is based on the Radio Industry Association standard AR.
IB STD-27 (digital car phone system) and ARIB ST
TDMA such as D-39 (digital mobile communication system for public service)
Used in the system. In addition, systems other than TDMA, for example, SCPC / FDMA (Single Channel Per Carrier /
In a frequency division multiple access (RF) system, a base station constantly transmits a control channel, and a terminal station receives the control channel to establish frame timing synchronization and also synchronizes a frequency. As a result, the accuracy of the transmission frequency of each terminal station is secured, and interference with other channels is suppressed. Further, the fact that the terminal station performs frame synchronization with the base station has an effect of facilitating the reception operation of the base station.
【０００８】[0008]
【発明が解決しようとする課題】前述の従来技術には、
基地局従属型の無線システムにおいて、基地局は制御チ
ャネル信号を常時送信する必要がある。このような基地
局常送のシステムでは、例えば防災無線のように平常時
には発呼が生起される頻度が非常に低い場合や、通常の
システムであっても接続の頻度が著しく低下した場合で
あっても、常に端末局からの発呼に対する待機状態を維
持しなければならない。従って、基地局の送信機の消費
電力の点で負担が大きい欠点があった。特に、停電時に
もある時間内での運用が可能となるように、バッテリを
備えたシステムもあり、そのようなシステムでは更に電
源効率の高いシステム運用方法が必要であった。本発明
の目的は、上記のような欠点を除去し、消費電力を軽減
した無線システムおよびシステムの運用方法を提供する
ことにある。The above-mentioned prior art includes the following:
In a base station-dependent wireless system, a base station needs to constantly transmit a control channel signal. In such a system of base station regular transmission, for example, when a call is generated at a very low frequency in normal times such as a disaster prevention radio, or when the connection frequency is significantly reduced even in a normal system. However, it is necessary to always maintain a standby state for a call from a terminal station. Therefore, there is a drawback that the load is large in terms of power consumption of the transmitter of the base station. In particular, there is a system provided with a battery so that operation can be performed within a certain time even during a power failure, and such a system requires a system operation method with higher power supply efficiency. SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless system and a method for operating the system, which eliminate the above-mentioned disadvantages and reduce power consumption.
【０００９】[0009]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の無線通信方法は、一定時間内に通信が無い
場合には、基地局の送信機を停止状態とし、この間に端
末局から発呼する場合は、端末局が基地局に対して送信
起動要求信号を送信し、基地局はこの信号を受信して送
信機を再起動するものである。In order to achieve the above object, a radio communication method according to the present invention provides a method in which, when there is no communication within a fixed time, a transmitter of a base station is stopped, and during this time, a terminal station is stopped. , A terminal station transmits a transmission start request signal to the base station, and the base station receives this signal and restarts the transmitter.
【００１０】即ち、本発明の無線通信方法は、少なくと
も基地局と複数の端末局とで構成されるデジタル無線シ
ステムであって、基地局が制御チャネル信号を常に送信
し、複数の端末局が制御チャネル信号を受信して基地局
のフレームタイミングに対して同期をとりフレームタイ
ミングを整合させる基地局従属型無線通信方法におい
て、基地局は回線の接続状態を監視し、直前の通話が終
了してから所定の時間内に呼接続の要求が無い場合は、
基地局はその送信機を停止状態にするものである。That is, the radio communication method according to the present invention is a digital radio system comprising at least a base station and a plurality of terminal stations, wherein the base station constantly transmits a control channel signal and the plurality of terminal stations perform control. In a base station-dependent wireless communication method that receives a channel signal, synchronizes with the frame timing of the base station, and matches the frame timing, the base station monitors the connection state of the line and waits for the immediately preceding call to end. If there is no call connection request within a predetermined time,
The base station stops the transmitter.
【００１１】また、本発明の無線通信方法は、複数の端
末局のそれぞれは、基地局の送信機が停止状態であるか
否かを検知し、検知の結果、基地局の送信機が停止状態
である場合には、基地局に対して送信起動要求信号を送
信するものである。また端末局は更に、基地局に対して
送信起動要求信号を送信した後に、受信動作を行い、基
地局の制御チャネル信号を受信して、受信された制御チ
ャネル信号に対して同期を確立し、同期の確立後に通常
発呼を行うものである。Further, according to the wireless communication method of the present invention, each of the plurality of terminal stations detects whether or not the transmitter of the base station is in a stopped state, and as a result of the detection, the transmitter of the base station is in a stopped state. In the case of, a transmission start request signal is transmitted to the base station. Further, the terminal station further performs a receiving operation after transmitting a transmission start request signal to the base station, receives a control channel signal of the base station, and establishes synchronization with the received control channel signal, A normal call is made after synchronization is established.
【００１２】更にまた本発明の無線通信方法において、
基地局の送信機が停止状態にある場合に、基地局は、複
数の端末局の少なくとも１つから送信される送信起動要
求信号を受信したときに、停止状態にある基地局の送信
機を起動して、制御チャネル信号の送信を開始する。そ
してまた、端末局が送信起動要求信号を送信したとき、
基地局は送信起動要求信号を送信した端末局を特定し、
特定された端末局が、基地局のゾーン内にあるときに、
停止状態にある基地局の送信機を起動して、制御チャネ
ル信号の送信を開始するものである。また更に、本発明
の無線通信方法の基地局は、送信起動要求信号を受信し
たとき、送信起動要求信号を送信した端末局を特定し、
特定された端末局が、基地局のゾーン内にあるときに、
停止状態にある基地局の送信機を起動し、かつ、特定さ
れた端末局に通信チャネルを割り当てるものである。ま
た、本発明の無線通信方法の端末局は、基地局から送信
される信号の受信の同期を確認し、受信の同期が確立し
ていれば通常発呼を行う。そのほか、本発明の無線通信
方法の端末局は、基地局から送信される信号の受信の同
期を確認し、受信の同期が確立されなければ、基地局の
送信機が停止状態にあると検知するものである。Further, in the wireless communication method of the present invention,
When the transmitter of the base station is in the stop state, the base station starts the transmitter of the base station in the stop state when receiving the transmission start request signal transmitted from at least one of the plurality of terminal stations. Then, transmission of the control channel signal is started. And when the terminal station transmits the transmission start request signal,
The base station identifies the terminal station that has transmitted the transmission activation request signal,
When the identified terminal station is in the zone of the base station,
It starts the transmitter of the base station in the stopped state and starts transmission of the control channel signal. Furthermore, the base station of the wireless communication method of the present invention, when receiving the transmission start request signal, specifies the terminal station that has transmitted the transmission start request signal,
When the identified terminal station is in the zone of the base station,
This starts the transmitter of the base station in the stopped state, and allocates a communication channel to the specified terminal station. Further, the terminal station of the wireless communication method of the present invention confirms the synchronization of reception of a signal transmitted from the base station, and makes a normal call if the synchronization of reception is established. In addition, the terminal station of the wireless communication method of the present invention confirms the synchronization of reception of a signal transmitted from the base station, and if the synchronization of reception is not established, detects that the transmitter of the base station is in a stopped state. Things.
【００１３】[0013]
【発明の実施の形態】本発明の一実施例を図１によって
説明する。以下、本発明の実施例の説明において、随
時、図５に示したTDMAシステムと図６に示したフレーム
構成を用いる。図１は本発明の一実施例の動作を説明す
るための図である。図１(a)は基地局の基本的な構成図
であり、11は基地局制御装置、12は無線装置、13はモー
ド切換え器、14は空中線である。図１(a)において、基
地局制御装置11は、無線装置12に送信データや制御信号
などを与え、同時に、無線装置12から受信データや状態
信号などを入力する。無線装置12は、少なくとも送信機
と受信機とを含み、基地局制御装置11から与えられる信
号に対応して、空中線14を介して、送信データの送信
や、受信を行う。基地局制御装置11は同時に、モード切
換え器13に制御信号を与える。モード切換え器13は、基
地局制御装置11から与えられる制御信号を受けて、無線
装置12の動作モードを制御する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. Hereinafter, in the description of the embodiments of the present invention, the TDMA system shown in FIG. 5 and the frame configuration shown in FIG. 6 will be used as needed. FIG. 1 is a diagram for explaining the operation of one embodiment of the present invention. FIG. 1A is a basic configuration diagram of a base station, in which 11 is a base station control device, 12 is a radio device, 13 is a mode switch, and 14 is an antenna. In FIG. 1A, a base station control device 11 supplies transmission data, a control signal, and the like to a radio device 12, and at the same time, inputs reception data, a status signal, and the like from the radio device 12. The wireless device 12 includes at least a transmitter and a receiver, and transmits and receives transmission data via the antenna 14 in response to a signal given from the base station control device 11. The base station controller 11 simultaneously supplies a control signal to the mode switch 13. The mode switch 13 receives the control signal provided from the base station control device 11 and controls the operation mode of the wireless device 12.
【００１４】無線装置12の動作モードについては、図１
(b)を用いて説明する。図１(b)は、無線装置12の動作モ
ードを説明する図である。21〜24は説明のためのタイミ
ング、25は送信出力信号、26は動作モード切換え信号、
27と29は常送モード、28は待機モードである。また、横
軸は時刻である。図１(b)において、送信出力25は空中
線14の出力の様子を示し、動作モード切換え信号26はモ
ード切換え器13の出力の様子を示している。この図に示
すように、無線装置12は動作モード切換え信号に応じ
て、常送モード27または29と待機モード28に切換えられ
る。The operation mode of the wireless device 12 is shown in FIG.
This will be described using (b). FIG. 1B is a diagram illustrating an operation mode of the wireless device 12. 21 to 24 are timings for explanation, 25 is a transmission output signal, 26 is an operation mode switching signal,
27 and 29 are a normal delivery mode, and 28 is a standby mode. The horizontal axis is time. In FIG. 1B, the transmission output 25 indicates the state of the output of the antenna 14, and the operation mode switching signal 26 indicates the state of the output of the mode switch 13. As shown in this figure, the wireless device 12 is switched between a normal transmission mode 27 or 29 and a standby mode 28 in response to an operation mode switching signal.
【００１５】常送モード27または29では、従来技術によ
る運用に従う動作を行う。即ち、基地局101は常時制御
チャネルを含めたスロット（CCH108-4）を送信機によっ
て送信し、これを受信可能な端末局A102または端末局B1
03が同期を確保できるようにする。一方、待機モード28
では、基地局101は、常時制御チャネルを含めたスロッ
トの送信を停止した上で、端末局A102または端末局B103
からの信号を待ち受ける。即ち、無線装置12の送信機を
停止状態にして、端末局A102または端末局B103からの信
号を待ち受ける。図１(b)中、タイミング21に示す時刻
に起きる、無線装置12の動作モードを、常送モード27か
ら待機モード28へ移行させるには、次のような条件が必
要である。即ち、基本的に、常送モード27の期間中にお
いて、あらかじめ定められた所定の時間内に回線接続が
無い場合には、待機モード28へ移行する。ただし、非常
時などによって、基地局101の操作者の設定、あるい
は、該当無線ゾーンを制御する制御局（図５では図示し
ていない）からの制御信号により、待機モード28への移
行が禁止されている場合には、所定時間内に回線接続が
無い場合でも待機モード28へ移行せず、常送モード27を
維持する。In the normal transmission mode 27 or 29, the operation according to the operation according to the prior art is performed. That is, the base station 101 always transmits a slot (CCH108-4) including the control channel by the transmitter, and receives the terminal station A102 or the terminal station B1 capable of receiving the slot (CCH108-4).
03 to ensure synchronization. On the other hand, standby mode 28
Then, the base station 101 always stops transmission of the slot including the control channel, and then sets the terminal station A102 or the terminal station B103
Wait for a signal from. That is, the transmitter of the wireless device 12 is stopped, and waits for a signal from the terminal station A102 or the terminal station B103. In FIG. 1B, the following conditions are required to shift the operation mode of the wireless device 12 from the normal transmission mode 27 to the standby mode 28 at the time indicated by the timing 21. That is, basically, if there is no line connection within a predetermined period of time during the period of the normal transmission mode 27, the mode shifts to the standby mode. However, in an emergency or the like, the transition to the standby mode 28 is prohibited by a setting of an operator of the base station 101 or a control signal from a control station (not shown in FIG. 5) for controlling the corresponding wireless zone. In this case, even if there is no line connection within a predetermined time, the normal mode 27 is maintained without shifting to the standby mode 28.
【００１６】このような条件を実現するために、モード
切換え器13には、図２に示すフローチャートに従う動作
を行わせる。図２は本発明の基地局の動作モード移行処
理の一実施例を示すフローチャートである。図２におい
て、移行禁止確認ステップ101では、モード切換え器13
に待機モードへの移行禁止が設定されていれば、常送モ
ードを維持させ移行禁止確認ステップ101を繰り返す
（待機して、常送モードを維持している）。また、待機
モードへの移行禁止が設定されていなければ、ステップ
102に進む。In order to realize such a condition, the mode switch 13 performs an operation according to a flowchart shown in FIG. FIG. 2 is a flowchart showing one embodiment of the operation mode transition processing of the base station according to the present invention. In FIG. 2, in the shift prohibition confirmation step 101, the mode switch 13
If the transition prohibition to the standby mode is set to the normal mode, the normal transmission mode is maintained and the transition prohibition confirmation step 101 is repeated (waiting and maintaining the normal transmission mode). If prohibition of transition to standby mode is not set, step
Go to 102.
【００１７】時間計算ステップ102では、最終通話の終
了時刻から現在時刻までの時間Tを計算し、ステップ103
に進む。時間比較ステップ103では、時間Tが予め設定さ
れた値Lを超えていればステップ104に進み、予め設定さ
れた値L以内であればステップ101に戻る。待機モード移
行ステップ104では、モード切換え器13は、待機モード
に移行させるための動作モード切換え信号26を無線装置
12に与える。こうして、無線装置12に動作モード切換え
信号26が与えられると、無線装置12は送信モード27から
待機モード28に動作モードを切換える。In time calculation step 102, time T from the end time of the last call to the current time is calculated, and step 103
Proceed to. In the time comparison step 103, if the time T exceeds the preset value L, the process proceeds to step 104, and if the time T is within the preset value L, the process returns to step 101. In the standby mode shift step 104, the mode switcher 13 outputs an operation mode switch signal 26 for shifting to the standby mode.
Give to 12. Thus, when the operation mode switching signal 26 is given to the wireless device 12, the wireless device 12 switches the operation mode from the transmission mode 27 to the standby mode 28.
【００１８】次に、待機モード28から常送モード29へ移
行するための移行条件を図３に示すフローチャートによ
り説明する。図３は、本発明の基地局101での動作モー
ド移行処理の一実施例を示すフローチャートである。強
制常送モード確認ステップ201では、基地局101あるいは
該当無線ゾーンを制御する制御局から与えられる制御信
号により、強制的に、常送モードへの移行の指示があっ
た場合には、常送モード移行ステップ207に進み常送モ
ードへ移行する。また、常送モードへの移行の指示がな
かった場合には、ステップ202に進む。Next, transition conditions for transition from the standby mode 28 to the normal delivery mode 29 will be described with reference to the flowchart shown in FIG. FIG. 3 is a flowchart showing an embodiment of the operation mode transition processing in the base station 101 of the present invention. In the forced normal transmission mode confirmation step 201, if a command to shift to the normal transmission mode is forcibly given by a control signal given from the base station 101 or a control station controlling the corresponding radio zone, the normal transmission mode The process proceeds to the transition step 207 to transition to the normal delivery mode. If there is no instruction to shift to the normal forwarding mode, the process proceeds to step 202.
【００１９】発呼要求確認ステップ202では、基地局101
自身から発呼を行うか否か確認し、発呼を行う場合には
常送モード移行ステップ207に進み、基地局101は常送モ
ードへ移行し、端末局（端末局A102または端末局B103）
が同期を確立する時間を持って通常発呼を行う。また、
発呼を行う指示がなかった場合には、ステップ203に進
む。In the call request confirmation step 202, the base station 101
It is confirmed whether or not to make a call from itself, and if a call is to be made, the process proceeds to the regular transmission mode transition step 207, where the base station 101 transitions to the regular transmission mode, and the terminal station (terminal station A102 or terminal station B103)
Make a normal call with time to establish synchronization. Also,
If there is no instruction to make a call, the process proceeds to step 203.
【００２０】受信動作ステップ203では、待機モード中
の基地局101において、受信動作を常時行い、端末局か
ら送信される送信起動要求信号を待ち受け、ステップ20
4に進む。同期確認ステップ204では、端末局のフレーム
タイミングが不確定であるため、待機モード中の受信に
自局のタイミングを基準としない同期が必要であるの
で、まず同期確認を行い、同期が取れた場合にステップ
205に進む。このため、端末局から送信される送信起動
要求信号は、基地局101の無線装置12の性能にもよる
が、例えば、25フレーム程度（例えば、1フレームを40
msecとすると、1 sec）の間、連続して送信される。即
ち、送信起動要求信号を送信する長さは、基地局と端末
局との同期が取れていないため、接続要求信号に比べて
長い。端末局識別ステップ205では、受信信号がこの信
号を送信した端末局を識別し、ステップ206に進む。基
地局ゾーン確認ステップ206では、この受信信号が自基
地局ゾーン内からの送信起動要求信号であればステップ
207に進み、そうでなければステップ201に戻る。常送モ
ード移行ステップ207では、常送モードへ移行する。以
上のように、端末局A102または端末局B103から発呼の要
求がある場合にも、常送モードへ移行する機能を有する
点が最も重要である。In the receiving operation step 203, the base station 101 in the standby mode always performs a receiving operation and waits for a transmission start request signal transmitted from the terminal station.
Proceed to 4. In the synchronization confirmation step 204, since the frame timing of the terminal station is uncertain, it is necessary to perform synchronization without reference to the timing of the own station for reception in the standby mode. Step to
Proceed to 205. For this reason, the transmission start request signal transmitted from the terminal station depends on the performance of the wireless device 12 of the base station 101, but is, for example, about 25 frames (for example, 40 frames per frame).
If msec, it is transmitted continuously for 1 sec). That is, the length of transmitting the transmission start request signal is longer than the connection request signal because the base station and the terminal station are not synchronized. In the terminal station identification step 205, the received signal identifies the terminal station that transmitted this signal, and the process proceeds to step 206. In the base station zone confirmation step 206, if the received signal is a transmission start request signal from within the own base station zone,
Proceed to step 207, otherwise return to step 201. In the normal transmission mode transition step 207, the operation transits to the normal transmission mode. As described above, the most important point is to have a function of shifting to the normal transmission mode even when a call is requested from the terminal station A102 or the terminal station B103.
【００２１】次に、待機モードにおける端末局の動作を
図４に示すフローチャートにより説明する。図４は、本
発明の端末局動作の一実施例を示すフローチャートであ
る。端末局A102または端末局B103で発呼要求が生じた場
合、図４のフローチャートの処理が始まる。まず受信同
期確認ステップ301では、受信同期の確認を行い、受信
の同期が確立していれば（基地局101の無線装置12の送
信機が停止状態ではないことを検知し）ステップ305に
進み通常発呼を行う（即ち、接続要求信号を基地局101
に向けて送信する）。また、受信の同期が確立していな
ければ、基地局101の無線装置12の送信機が停止状態に
あることを検知し、ステップ302に進む。送信起動信号
送信ステップ302では、検知の結果、基地局101が待機モ
ードにあると判断して、基地局101に送信起動要求信号
を送信し、ステップ303に進む。基地局101では、この送
信起動要求信号を受信して、図３のステップ203からス
テップ207が行なわれ、常送モードに移行し制御チャネ
ル信号の送信を開始する。受信同期確立動作ステップ30
3では、基地局101から送信された制御チャネル信号を受
信して受信同期の確立を行い、ステップ304に進む。受
信同期確認ステップ304では、受信同期の確認を行い、
受信の同期が確立していればステップ305に進み通常発
呼を行う。また、受信同期が確立していなければ、ステ
ップ303に進み、ステップ303とステップ304を繰り返し
て同期が確立するのを待ち、同期が確立した時点でステ
ップ305において通常発呼を行う。Next, the operation of the terminal station in the standby mode will be described with reference to the flowchart shown in FIG. FIG. 4 is a flowchart showing one embodiment of the operation of the terminal station of the present invention. When a call request is generated in the terminal station A102 or the terminal station B103, the processing of the flowchart in FIG. 4 starts. First, in the reception synchronization confirmation step 301, the reception synchronization is confirmed, and if the reception synchronization is established (it is detected that the transmitter of the wireless device 12 of the base station 101 is not in a stopped state), the process proceeds to step 305. Make a call (that is, send a connection request signal to the base station 101).
To send to). If reception synchronization has not been established, it is detected that the transmitter of the wireless device 12 of the base station 101 is in a stopped state, and the process proceeds to step 302. In the transmission start signal transmission step 302, as a result of the detection, it is determined that the base station 101 is in the standby mode, a transmission start request signal is transmitted to the base station 101, and the process proceeds to step 303. The base station 101 receives the transmission start request signal, and performs steps 203 to 207 in FIG. 3 to shift to the normal transmission mode and start transmitting the control channel signal. Receive synchronization establishment operation step 30
In 3, the control channel signal transmitted from the base station 101 is received to establish reception synchronization, and the process proceeds to step 304. In the reception synchronization confirmation step 304, reception synchronization is confirmed,
If the reception synchronization has been established, the process proceeds to step 305, and a normal call is made. If the reception synchronization has not been established, the process proceeds to step 303, and repeats steps 303 and 304 until the synchronization is established. When the synchronization is established, a normal call is made in step 305.
【００２２】あるいは、基地局101が常送モードへ移行
した後に、送信起動要求を送信した端末局A102または端
末局B103のいずれかに対して発呼を行うことも可能であ
る。即ち、図４において、ステップ301からステップ302
の処理の後、基地局101は端末局から送信された送信起
動要求信号を受信し、図３の同期確認ステップ204、端
末局識別ステップ205、基地局ゾーン確認ステップ206、
及び常送モード移行ステップ207で説明した処理を行
い、更に、送信起動要求信号を送信した端末局に対して
通常発呼を行う。この場合、端末局は通常発呼ステップ
305を行わず、基地局から送信される発呼を待ち受け
る。Alternatively, after the base station 101 shifts to the normal transmission mode, it is possible to make a call to either the terminal station A 102 or the terminal station B 103 which has transmitted the transmission activation request. That is, in FIG.
After the above processing, the base station 101 receives the transmission start request signal transmitted from the terminal station, and executes the synchronization confirmation step 204, the terminal station identification step 205, the base station zone confirmation step 206,
Then, the process described in the normal transmission mode transition step 207 is performed, and a normal call is made to the terminal station that has transmitted the transmission activation request signal. In this case, the terminal station normally performs the calling step
Wait for a call transmitted from the base station without performing 305.
【００２３】なお、上記実施例では、あらかじめ定めら
れた所定時間内に回線接続がなかった場合に基地局は待
機モードに移行したが、一定周期で待機モードに移行し
ても良いし、また、一定周期で常送モードに復帰しても
良い。また、上記実施例では、端末局識別ステップ205
と基地局ゾーン確認ステップ206において、送信起動要
求信号を送信した端末局を識別して、自基地局ゾーン内
からの送信起動要求信号であれば常送モードに移行した
が、自基地局ゾーン外からの送信起動要求信号でであっ
ても、常送モードに移行して良いし、更に、送信起動要
求信号を送信した端末局を識別せずに常送モードに移行
して良い。また、また、上記実施例では、常送モードで
あるか否かを端末局が検知する方法として、同期が確立
するか否かを判断の基準としたが、例えば、端末局が受
信する所定の信号の受信電界強度が所定の値以下である
か否かを判断基準にしても良いし、その他の手段でも良
い。In the above-described embodiment, the base station shifts to the standby mode when there is no line connection within a predetermined time, but may shift to the standby mode at a constant cycle. The mode may be returned to the normal forwarding mode at a constant cycle. In the above embodiment, the terminal station identification step 205
In the base station zone confirmation step 206, the terminal station that transmitted the transmission start request signal is identified, and if the transmission start request signal is from within the own base station zone, the mode is shifted to the normal transmission mode. Even if the transmission start request signal is received from the terminal, the mobile station may shift to the normal transmission mode, or may shift to the normal transmission mode without identifying the terminal station that has transmitted the transmission start request signal. Further, in the above-described embodiment, as a method for the terminal station to detect whether or not the terminal is in the normal transmission mode, the determination is made based on whether or not synchronization is established. The determination may be made based on whether or not the received electric field strength of the signal is equal to or less than a predetermined value, or other means may be used.
【００２４】[0024]
【発明の効果】以上のように本発明によれば、平常時に
発呼が生起される頻度が非常に低いシステムや、接続の
頻度が著しく低下したシステムの場合には、基地局の送
信動作を停止し、必要なときに送信を再起動することに
より、無駄な送信動作を抑制して、基地局の消費電力を
節約するシステム運用が可能となる。また、本発明によ
れば、基地局従属型のシステムにおいて、基地局が送信
を停止している場合を含む任意の時刻に、端末局からの
発呼による接続が可能となるシステムが実現できる。As described above, according to the present invention, the transmission operation of the base station is performed in a system in which a call is not frequently generated in a normal time or in a system in which the frequency of connection is significantly reduced. By stopping and restarting transmission when necessary, it is possible to suppress unnecessary transmission operation and operate the system to save power consumption of the base station. Further, according to the present invention, in a base station-dependent system, a system can be realized in which connection by calling from a terminal station is possible at any time, including when the base station has stopped transmitting.
【図１】 本発明の一実施例の動作を説明するために
図。FIG. 1 is a diagram for explaining the operation of one embodiment of the present invention.
【図２】 本発明の基地局の動作モード移行処理の一実
施例を示すフローチャート。FIG. 2 is a flowchart showing an embodiment of an operation mode transition process of the base station according to the present invention.
【図３】 本発明の基地局の動作モード移行処理の一実
施例を示すフローチャート。FIG. 3 is a flowchart illustrating an embodiment of an operation mode transition process of the base station according to the present invention.
【図４】 本発明の端末局動作の一実施例を示すフロー
チャート。FIG. 4 is a flowchart showing one embodiment of the operation of the terminal station of the present invention.
【図５】 従来の端末局と基地局間とでの通信の様子を
示す図。FIG. 5 is a diagram showing a state of communication between a conventional terminal station and a base station.
【図６】 従来の時分割多重システムのスロットを示す
図。FIG. 6 is a diagram showing slots of a conventional time division multiplex system.
11：基地局制御装置、 12：無線装置、 13：モード切
換え器、 14：空中線、 21〜24：タイミング、 25：
送信出力信号、 26：動作モード切換え信号、27，29：
常送モード、 28：待機モード、 101：基地局、 10
2：端末局A、103：端末局B、 104-1，104-2：下り信
号、 105-1，105-2：上り信号、 106：下り信号のフ
レーム区切り、 107：上り信号のフレーム区切り、 1
08-1，2，3，4：下り信号のスロット、 109-1，2，3，
4：上り信号のスロット、 110：時間軸。11: base station controller, 12: wireless device, 13: mode switcher, 14: antenna, 21-24: timing, 25:
Transmission output signal, 26: Operation mode switching signal, 27, 29:
Normal mode, 28: standby mode, 101: base station, 10
2: terminal station A, 103: terminal station B, 104-1, 104-2: downlink signal, 105-1, 105-2: uplink signal, 106: downlink signal frame partition, 107: uplink signal frame partition, 1
08-1, 2, 3, 4: Downlink signal slot, 109-1, 2, 3,
4: Uplink signal slot, 110: Time axis.
フロントページの続き Ｆターム(参考） 5K028 AA11 BB06 CC02 HH00 KK12 LL12 NN02 RR02 5K060 BB05 CC04 CC11 FF06 LL05 LL25 5K067 AA43 CC04 DD23 DD25 DD30 EE02 EE10 EE22 EE64 EE65 EE71 FF05 GG08 JJ02 JJ12Continued on the front page F-term (reference)
Claims (9)
成されるデジタル無線システムであって、該基地局が制
御チャネル信号を常に送信し、前記複数の端末局が該制
御チャネル信号を受信して前記基地局のフレームタイミ
ングに対して同期をとり該フレームタイミングを整合さ
せる基地局従属型無線通信方法において、 前記基地局は回線の接続状態を監視し、 直前の通話が終了してから所定の時間内に呼接続の要求
が無い場合は、前記基地局はその送信機を停止状態にす
ることを特徴とする無線通信方法。1. A digital radio system comprising at least a base station and a plurality of terminal stations, the base station constantly transmitting a control channel signal, and the plurality of terminal stations receiving the control channel signal. In the base station dependent wireless communication method for synchronizing with the frame timing of the base station and matching the frame timing, the base station monitors a connection state of a line, and a predetermined state is determined after the immediately preceding communication is completed. If there is no request for call connection within the time, the base station stops its transmitter.
地局の送信機が停止状態であるか否かを検知し、 前記検知の結果、前記基地局の送信機が停止状態である
場合には、前記基地局に対して送信起動要求信号を送信
することを特徴とする無線通信方法。2. The wireless communication method according to claim 1, wherein when any one of the plurality of terminal stations makes a call, it detects whether a transmitter of the base station is in a stopped state, and As a result, when the transmitter of the base station is in a stopped state, a transmission start request signal is transmitted to the base station.
送信される前記送信起動要求信号を受信したときに、停
止状態にある前記基地局の送信機を起動して、前記制御
チャネル信号の送信を開始することを特徴とする無線通
信方法。3. The radio communication method according to claim 2, wherein the base station is in a stopped state when receiving the transmission start request signal transmitted from at least one of the plurality of terminal stations. A wireless communication method comprising: activating a transmitter of a station to start transmitting the control channel signal.
載の無線通信方法において、前記端末局は、 前記基地局に対して前記送信起動要求信号を送信した後
に、受信動作を行い、 前記基地局の前記制御チャネル信号を受信して、受信さ
れた前記制御チャネル信号に対して同期を確立し、該同
期の確立後に通常発呼を行うことを特徴とする無線通信
方法。4. The wireless communication method according to claim 2, wherein the terminal station performs a reception operation after transmitting the transmission activation request signal to the base station, A wireless communication method comprising receiving the control channel signal of a base station, establishing synchronization with the received control channel signal, and making a normal call after the establishment of the synchronization.
載の無線通信方法におい て、 前記端末局が前記送信起動要求信号を送信したとき、前
記基地局は前記送信起動要求信号を送信した端末局を特
定し、 特定された端末局が、前記基地局のゾーン内にあるとき
に、停止状態にある前記基地局の送信機を起動して、前
記制御チャネル信号の送信を開始することを特徴とする
無線通信方法。5. The wireless communication method according to claim 2, wherein, when the terminal station transmits the transmission activation request signal, the base station transmits the transmission activation request signal. Identifying a terminal station, when the identified terminal station is in the zone of the base station, activating a transmitter of the base station in a stopped state and starting transmission of the control channel signal. Characteristic wireless communication method.
の無線通信方法において、 前記基地局は、前記送信起動要求信号を受信したとき、
前記送信起動要求信号を送信した端末局を特定し、 特定された端末局が、前記基地局のゾーン内にあるとき
に、停止状態にある前記基地局の送信機を起動し、か
つ、前記特定された端末局に通信チャネルを割り当てる
ことを特徴とする無線通信方法。6. The wireless communication method according to claim 2, wherein the base station receives the transmission start request signal,
Identifying a terminal station that has transmitted the transmission activation request signal, and when the identified terminal station is in a zone of the base station, activates a transmitter of the base station in a stopped state, and performs the identification. A wireless communication method, wherein a communication channel is allocated to a selected terminal station.
の無線通信方法において、前記端末局は、 前記基地局から送信される信号の受信の同期を確認し、
該受信の同期が確立していれば、通常発呼を行うことを
特徴とする無線通信方法。7. The wireless communication method according to claim 2, wherein the terminal station confirms reception synchronization of a signal transmitted from the base station,
A wireless communication method characterized by making a normal call if the reception synchronization is established.
の無線通信方法において、前記端末局は、 前記基地局から送信される信号の受信の同期を確認し、
該受信の同期が確立されなければ、前記基地局の送信機
が停止状態にあると検知することを特徴とする無線通信
方法。8. The wireless communication method according to claim 2, wherein the terminal station confirms reception synchronization of a signal transmitted from the base station,
If the synchronization of the reception is not established, it is detected that the transmitter of the base station is in a stopped state.
の無線通信方法において、 前記端末局が前記送信起動要求信号を送信するフレーム
数は、前記端末局が同期の確立後に通常発呼を行うため
に送信する接続要求信号のフレーム数より多いことを特
徴とする無線通信方法。9. The wireless communication method according to claim 2, wherein the number of frames in which the terminal station transmits the transmission start request signal is determined based on the number of frames normally transmitted after the terminal station establishes synchronization. A number of frames of the connection request signal transmitted to perform the wireless communication.
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