JP2006287354A - Polling system - Google Patents

Polling system Download PDF

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JP2006287354A
JP2006287354A JP2005101433A JP2005101433A JP2006287354A JP 2006287354 A JP2006287354 A JP 2006287354A JP 2005101433 A JP2005101433 A JP 2005101433A JP 2005101433 A JP2005101433 A JP 2005101433A JP 2006287354 A JP2006287354 A JP 2006287354A
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communication
master station
slave stations
polling
slave
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JP4616048B2 (en
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Toshiaki Koshida
俊明 越田
Koichi Mitsuo
晃一 満尾
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Hitachi Ltd
Tokyo Electric Power Company Holdings Inc
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Tokyo Electric Power Co Inc
Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a polling system capable of realizing channel allocation in a short period of time, even when the number of slave stations is increased. <P>SOLUTION: The communications system comprises a master station 10, and a plurality of slave stations 30-1, ..., 30-N. The communication system includes a plurality of two-way communication channels for conducting communication among the master station 10 and the slave stations 30-1, ..., 30-N. The master station 10 periodically transmits polling signals to the slave stations 30-1, ..., 30-N, the slave stations receiving the polling signals transmit a communication request, and the master station receiving the communication request assigns communication channels between the master station and the slave stations. The master station 10 transmits the polling signals to the slave stations 30-1, 30-2, ..., 30-N-2, 30-N, whose channels are not allocated, at the same time via a plurality of downlink communication channels which are not allocated, and the slave stations receiving the polling signals transmit the communication request, at the same time via uplink communication channels forming pairs with the downlink communication channels via which the polling signals are received. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、親局が全ての子局に対して周期的にポーリング信号を送出して、子局からの通信要求を受信する、ポーリング方式に関する。   The present invention relates to a polling method in which a master station periodically sends a polling signal to all the slave stations and receives a communication request from the slave station.

従来のポーリング方式としては、例えば、特開平８−３０７４３４号公報に記載のように、親局が複数の子局に対してポーリング信号を送信する場合、単一の下り制御チャネルを介して、個々の子局に対して順次ポーリング信号を送信し、ポーリング信号を受信した子局が、上り制御チャネルを介して１局毎に要求信号を送信するものが知られている。   As a conventional polling method, for example, as described in JP-A-8-307434, when a master station transmits a polling signal to a plurality of slave stations, individual polling signals are transmitted via a single downlink control channel. It is known that a polling signal is sequentially transmitted to each slave station, and the slave station that has received the polling signal transmits a request signal for each station via an uplink control channel.

特開平８−３０７４３４号公報JP-A-8-307434

しかしながら、特開平８−３０７４３４号公報に記載の方式では、単一の下り制御チャネルを介して親局が個々の子局に対するポーリング信号を順番に送信し、ポーリング信号を受信した子局が、単一の上り制御チャネルを介して要求信号を順次送信するため、子局数が増加した場合には、子局数に比例してポーリング信号の送信周期が長くなり、結果として子局に対する回線割り当てに要する時間が長くなるという問題があった。   However, in the method described in Japanese Patent Laid-Open No. 8-307434, the master station sequentially transmits polling signals to individual slave stations via a single downlink control channel, and the slave station that has received the polling signal is Since the request signal is transmitted sequentially through one uplink control channel, if the number of slave stations increases, the polling signal transmission cycle becomes longer in proportion to the number of slave stations, and as a result, the line assignment to the slave stations is increased. There was a problem that it took a long time.

本発明の目的は、子局数が増加した場合でも、短時間での回線割り当てを実現できるポーリング方式を提供することにある。   An object of the present invention is to provide a polling method capable of realizing line assignment in a short time even when the number of slave stations is increased.

（１）上記目的を達成するために、本発明は、親局と複数の子局とからなり、前記親局と前記子局との間で通信を行なう複数の双方向の通信チャネルを有し、前記親局が前記子局に対して周期的にポーリング信号を送信し、ポーリング信号を受信した子局が通信要求を送信し、通信要求を受信した親局が該子局との間に通信チャネルを割り当てる通信システムに用いられるポーリング方式であって、前記親局は、回線の割り当てられていない複数の下り通信チャネルを介して、前記回線の割り当てられていない子局に対して複数のポーリング信号を同時に送信し、ポーリング信号を受信した複数の子局が、ポーリング信号を受信した下り通信チャネルと対を成す上り通信チャネルを介して、同時に通信要求を送信するようにしたものである。
かかる方式により、子局数が増加した場合でも、短時間での回線割り当てを実現できるものとなる。 (1) In order to achieve the above object, the present invention comprises a master station and a plurality of slave stations, and has a plurality of bidirectional communication channels for performing communication between the master station and the slave stations. The master station periodically transmits a polling signal to the slave station, the slave station that has received the polling signal transmits a communication request, and the master station that has received the communication request communicates with the slave station. A polling method used in a communication system for allocating a channel, wherein the master station sends a plurality of polling signals to a slave station not assigned a line via a plurality of downlink communication channels not assigned a line. Are transmitted simultaneously, and a plurality of slave stations that have received the polling signal simultaneously transmit a communication request via an upstream communication channel that is paired with the downstream communication channel that has received the polling signal.
With this method, even when the number of slave stations is increased, line assignment in a short time can be realized.

（２）また、上記目的を達成するために、本発明は、親局と複数の子局とからなり、前記親局と前記子局との間で通信を行なう複数の双方向の通信チャネルを有し、前記親局が前記子局に対して周期的にポーリング信号を送信し、ポーリング信号を受信した子局が通信要求を送信し、通信要求を受信した親局が該子局との間に通信チャネルを割り当てる通信システムに用いられるポーリング方式であって、前記親局は、下り通信チャネルとして、複数の通信チャネルを時分割多重したＴＤＭ回線を使用して、回線の割り当てられていない下り通信チャンネルを介して、前記回線の割り当てられていない子局に対してポーリング信号を同時に送信し、ポーリング信号を受信した複数の子局が、ポーリング信号を受信した下り通信チャネルと対を成す上り通信チャネルを介して、同時に通信要求を送信するようにしたものである。
かかる方式により、子局数が増加した場合でも、短時間での回線割り当てを実現できるものとなる。 (2) Further, in order to achieve the above object, the present invention comprises a plurality of bidirectional communication channels comprising a master station and a plurality of slave stations, and performing communication between the master station and the slave stations. The master station periodically transmits a polling signal to the slave station, the slave station that has received the polling signal transmits a communication request, and the master station that has received the communication request communicates with the slave station. A polling method used in a communication system for allocating communication channels to the base station, wherein the master station uses a TDM line in which a plurality of communication channels are time-division multiplexed as a downlink communication channel, and the downlink communication to which no line is assigned A polling signal is simultaneously transmitted to a slave station to which the line is not assigned via the channel, and a plurality of slave stations that have received the polling signal pair with the downlink communication channel that has received the polling signal. Through to uplink communication channel, in which so as to transmit a communication request at the same time.
With this method, even when the number of slave stations is increased, line assignment in a short time can be realized.

（３）さらに、上記目的を達成するために、本発明は、親局と複数の子局とからなり、前記親局と前記子局との間で通信を行なう複数の双方向の通信チャネルを有し、前記親局が前記子局に対して周期的にポーリング信号を送信し、ポーリング信号を受信した子局が通信要求を送信し、通信要求を受信した親局が該子局との間に通信チャネルを割り当てる通信システムに用いられるポーリング方式であって、前記親局は、下り回線チャンネルを用いて、回線の割り当てられていない前記子局を指定した単一のポーリング信号を送信し、ポーリング信号によって指定された複数の子局が、複数の上り通信チャネルを介して同時に通信要求を送信するようにしたものである。
かかる方式により、子局数が増加した場合でも、短時間での回線割り当てを実現できるものとなる。 (3) Furthermore, in order to achieve the above object, the present invention comprises a plurality of bidirectional communication channels comprising a master station and a plurality of slave stations and performing communication between the master station and the slave stations. The master station periodically transmits a polling signal to the slave station, the slave station that has received the polling signal transmits a communication request, and the master station that has received the communication request communicates with the slave station. A polling method used in a communication system for assigning a communication channel to the master station, wherein the master station uses a downlink channel to transmit a single polling signal designating the slave station to which no line is assigned, and polling A plurality of slave stations specified by the signal transmit a communication request simultaneously via a plurality of uplink communication channels.
With this method, even when the number of slave stations is increased, line assignment in a short time can be realized.

本発明によれば、子局数が増加した場合でも、短時間での回線割り当てを実現できるものとなる。   According to the present invention, even when the number of slave stations is increased, line assignment in a short time can be realized.

以下、図１〜図４を用いて、本発明の一実施形態によるポーリング方式について説明する。
最初に、図１を用いて、本実施形態によるポーリング方式を用いるマルチアクセス通信システムの構成について説明する。
図１は、本発明の一実施形態によるポーリング方式を用いるマルチアクセス通信システムの構成を示すシステムブロック図である。 Hereinafter, a polling method according to an embodiment of the present invention will be described with reference to FIGS.
First, the configuration of the multi-access communication system using the polling method according to the present embodiment will be described with reference to FIG.
FIG. 1 is a system block diagram showing a configuration of a multi-access communication system using a polling method according to an embodiment of the present invention.

本実施形態によるマルチアクセス通信システムは、親局１０と、複数の子局３０−１，３０−２，３０−３，…，３０−Ｎとからなる。親局１０と子局３０との間には、通信を行なう複数の双方向の通信チャネルを有している。親局１０は、通信衛星２０を介して、子局３０−１，３０−２，３０−３，…，３０−Ｎに対して周期的にポーリング信号を送出する。ポーリング信号を受信した子局３０−１，３０−２，３０−３，…，３０−Ｎは通信要求を送信する。通信要求を受信した親局１０は、ＤＡＭＡ制御により、通信要求を送信した子局との間に通信チャネルを割り当てる。   The multi-access communication system according to this embodiment includes a master station 10 and a plurality of slave stations 30-1, 30-2, 30-3, ..., 30-N. Between the master station 10 and the slave station 30, there are a plurality of bidirectional communication channels for performing communication. The master station 10 periodically sends polling signals to the slave stations 30-1, 30-2, 30-3,..., 30-N via the communication satellite 20. The slave stations 30-1, 30-2, 30-3,..., 30-N that have received the polling signal transmit a communication request. The master station 10 that has received the communication request assigns a communication channel to the slave station that has transmitted the communication request by DAMA control.

次に、図２を用いて、本実施形態によるポーリング方式について説明する。
図２は、本発明の一実施形態によるポーリング方式を示すタイムチャートである。図２（Ａ）は、下り通信チャンネル１と上り通信チャンネル１の通信状態を示しており、以下、図２（Ｂ）〜図２（Ｆ）は、下り通信チャンネル２〜Ｎと上り通信チャンネル２〜Ｎの通信状態を示している。 Next, the polling method according to the present embodiment will be described with reference to FIG.
FIG. 2 is a time chart illustrating a polling method according to an embodiment of the present invention. 2A shows the communication state of the downlink communication channel 1 and the uplink communication channel 1. Hereinafter, FIGS. 2B to 2F show the downlink communication channels 2 to N and the uplink communication channel 2 respectively. ~ N communication states are shown.

図１に示した通信システムは、Ｎ個の下り通信チャネルとＮ個の上り通信チャネルとを有する。ここで、Ｎ個の通信チャネルの中でＭ個の通信チャネル（例えば、図２（Ｃ），図２（Ｅ）に示すように、通信チャンネル３，Ｎ−１）は、既に子局に割り当てられて通信中の状態にあるとする。   The communication system shown in FIG. 1 has N downlink communication channels and N uplink communication channels. Here, of the N communication channels, M communication channels (for example, communication channels 3 and N-1 as shown in FIGS. 2C and 2E) are already assigned to the slave stations. Suppose you are in communication.

このような状態のとき、親局１０は、割り当てられていない（Ｎ−Ｍ）個の下り通信チャネル（図２（Ａ），図２（Ｂ），図２（Ｄ），図２（Ｆ）に示すように、下り通信チャンネル１，２，Ｎ−２，Ｎ）を介して、（Ｎ−Ｍ）個のポーリング信号を、（Ｎ−Ｍ）個の子局３０−１，３０−２，３０−Ｎ−２，３０−Ｎに、同時に送信する。自局向けのポーリング信号を受信した（Ｎ−Ｍ）局の子局３０−１，３０−２，３０−Ｎ−２，３０−Ｎは、図２（Ａ），図２（Ｂ），図２（Ｄ），図２（Ｆ）に示すように、受信した下り通信チャネルと対を成す上り通信チャネル１，２，Ｎ−２，Ｎを介して、同時に要求信号を送信する。   In such a state, the master station 10 has not been assigned (NM) downlink communication channels (FIGS. 2A, 2B, 2D, and 2F). (N−M) polling signals are transmitted to (N−M) slave stations 30-1 and 30-2 through downlink communication channels 1, 2, N−2 and N). 30-N-2 and 30-N are transmitted simultaneously. The slave stations 30-1, 30-2, 30-N-2, and 30-N of the (NM) station that has received the polling signal for its own station are shown in FIG. 2 (A), FIG. 2 (B), FIG. 2 (D) and FIG. 2 (F), request signals are transmitted simultaneously via the upstream communication channels 1, 2, N-2, and N that are paired with the received downstream communication channel.

次に、図３を用いて、本実施形態による他のポーリング方式について説明する。
図３は、本発明の一実施形態による他のポーリング方式を示すタイムチャートである。図３（Ａ）は、下りＴＤＭ回線の通信状態を示しており、図３（Ｂ）〜図３（Ｇ）は、上り通信チャンネル１〜Ｎの通信状態を示している。 Next, another polling method according to the present embodiment will be described with reference to FIG.
FIG. 3 is a time chart showing another polling method according to an embodiment of the present invention. 3A shows the communication state of the downlink TDM line, and FIGS. 3B to 3G show the communication states of the uplink communication channels 1 to N.

図１に示した通信システムは、１個の下りＴＤＭ回線とＮ個の上り通信チャネルとを有する。ここで、Ｎ個の通信チャネルの中でＭ個の通信チャネル（例えば、図３（Ｄ），図３（Ｆ）に示すように、通信チャンネル３，Ｎ−１）は、既に子局に割り当てられて通信中の状態にあるとする。   The communication system shown in FIG. 1 has one downlink TDM line and N uplink communication channels. Here, among the N communication channels, M communication channels (for example, communication channels 3 and N-1 as shown in FIGS. 3D and 3F) are already assigned to the slave stations. Suppose you are in communication.

このような時、親局１０は、図３（Ａ）に示すように、N個の下り通信チャネルを時分割多重して、単一のＴＤＭ回線を送信する。親局１０は、図３（Ａ）のＴＤＭフレームの構成に示すように、ＴＤＭ回線に多重された下り通信チャネルの中で、割り当てられていない（Ｎ−Ｍ）個の下り通信チャネルを介して、（Ｎ−Ｍ）個のポーリング信号を１ＴＤＭフレームで送信する。   In such a case, as shown in FIG. 3A, the master station 10 time-division multiplexes N downlink communication channels and transmits a single TDM line. As shown in the configuration of the TDM frame in FIG. 3A, the master station 10 passes through (NM) downlink communication channels that are not allocated among the downlink communication channels multiplexed on the TDM line. , (N−M) polling signals are transmitted in one TDM frame.

一方、自局向けのポーリング信号を受信した（Ｎ−Ｍ）局の子局３０−１，３０−２，３０−Ｎ−２，３０−Ｎは、受信した下り通信チャネルと対を成す上り通信チャネル１，２，Ｎ−２，Ｎを介して、同時に要求信号を送信する。   On the other hand, the slave stations 30-1, 30-2, 30-N-2, and 30-N of the (NM) station that has received the polling signal for the own station are paired with the received downlink communication channel. Request signals are transmitted simultaneously via channels 1, 2, N-2, and N.

次に、図４を用いて、本実施形態によるその他のポーリング方式について説明する。
次に、図４を用いて、本発明の一実施形態によるその他のポーリング方式を示すタイムチャートである。図４（Ａ）は、下り通信チャンネルの通信状態を示しており、図４（Ｂ）〜図４（Ｇ）は、上り通信チャンネル１〜Ｎの通信状態を示している。 Next, another polling method according to the present embodiment will be described with reference to FIG.
Next, it is a time chart which shows the other polling system by one Embodiment of this invention using FIG. 4A shows the communication state of the downlink communication channel, and FIG. 4B to FIG. 4G show the communication states of the uplink communication channels 1 to N.

図１に示した通信システムは、１個の下り通信チャンネルとＮ個の上り通信チャネルとを有する。ここで、Ｎ個の通信チャネルの中でＭ個の通信チャネル（例えば、図４（Ｄ），図４（Ｆ）に示すように、通信チャンネル３，Ｎ−１）は、既に子局に割り当てられて通信中の状態にあるとする。   The communication system shown in FIG. 1 has one downlink communication channel and N uplink communication channels. Here, among the N communication channels, M communication channels (for example, communication channels 3 and N-1 as shown in FIGS. 4D and 4F) are already assigned to the slave stations. Suppose you are in communication.

親局１０は、図４（Ａ）に示すように、単一の下り通信チャネルを介して、複数の子局から成る子局グループに対して、単一のポーリング信号を送信する。自局の収容されている子局グループ向けのポーリング信号を受信した（Ｎ−Ｍ）局の子局３０−１，３０−２，３０−Ｎ−２，３０−Ｎは、ポーリング信号により指定された上り通信チャネル１，２，Ｎ−２，Ｎを介して、同時に要求信号を送信する。   As shown in FIG. 4A, the master station 10 transmits a single polling signal to a slave station group including a plurality of slave stations via a single downlink communication channel. The slave stations 30-1, 30-2, 30-N-2 and 30-N of the (NM) stations that have received the polling signal for the slave station group accommodated by the local station are designated by the polling signal. The request signals are transmitted simultaneously via the uplink communication channels 1, 2, N-2, and N.

従来の方式では、親局が単一の制御チャネルを介してポーリング信号を送信する場合には、１回のポーリング信号の送信から要求信号の受信までに（ｍ）秒が必要とすると、全ての子局に対してポーリング信号送信するためには、子局数を（Ｋ）局とすると（m×Ｋ）秒が必要である。   In the conventional method, when the master station transmits a polling signal via a single control channel, if (m) seconds are required from transmission of a single polling signal to reception of a request signal, In order to transmit a polling signal to a slave station, if the number of slave stations is (K), (m × K) seconds are required.

これに対して、Ｎ個の通信チャネルの中で割り当てられていない（Ｎ−Ｍ）個の使用されていない通信チャネルを介してポーリング信号を送信することにより、全ての子局に対してポーリング信号を送出する時間を、（（m×Ｋ）／（Ｎ−Ｍ））秒に短縮することができる。
On the other hand, the polling signal is transmitted to all the slave stations by transmitting the polling signal through (N−M) unused communication channels that are not allocated among the N communication channels. Can be shortened to ((m × K) / (N−M)) seconds.

本発明の一実施形態によるポーリング方式を用いるマルチアクセス通信システムの構成を示すシステムブロック図である。1 is a system block diagram illustrating a configuration of a multi-access communication system using a polling method according to an embodiment of the present invention. 本発明の一実施形態によるポーリング方式を示すタイムチャートである。6 is a time chart illustrating a polling method according to an exemplary embodiment of the present invention. 本発明の一実施形態による他のポーリング方式を示すタイムチャートである。It is a time chart which shows the other polling system by one Embodiment of this invention. 本発明の一実施形態によるその他のポーリング方式を示すタイムチャートである。It is a time chart which shows the other polling system by one Embodiment of this invention.

符号の説明Explanation of symbols

１０…親局
２０…通信衛星
３０−１，３０−２，３０−３，…，３０−Ｎ…子局 DESCRIPTION OF SYMBOLS 10 ... Master station 20 ... Communication satellite 30-1, 30-2, 30-3, ..., 30-N ... Slave station

Claims (3)

親局と複数の子局とからなり、前記親局と前記子局との間で通信を行なう複数の双方向の通信チャネルを有し、前記親局が前記子局に対して周期的にポーリング信号を送信し、ポーリング信号を受信した子局が通信要求を送信し、通信要求を受信した親局が該子局との間に通信チャネルを割り当てる通信システムに用いられるポーリング方式であって、
前記親局は、回線の割り当てられていない複数の下り通信チャネルを介して、前記回線の割り当てられていない子局に対して複数のポーリング信号を同時に送信し、ポーリング信号を受信した複数の子局が、ポーリング信号を受信した下り通信チャネルと対を成す上り通信チャネルを介して、同時に通信要求を送信することを特徴とするポーリング方式。 The master station is composed of a master station and a plurality of slave stations, and has a plurality of bidirectional communication channels for performing communication between the master station and the slave stations, and the master station periodically polls the slave stations. A polling method used in a communication system that transmits a signal, a slave station that receives a polling signal transmits a communication request, and a master station that receives the communication request allocates a communication channel with the slave station,
The master station simultaneously transmits a plurality of polling signals to a slave station not assigned a line via a plurality of downlink communication channels not assigned a line, and receives the polling signal. A polling method characterized by simultaneously transmitting a communication request via an upstream communication channel that forms a pair with a downstream communication channel that has received a polling signal. 親局と複数の子局とからなり、前記親局と前記子局との間で通信を行なう複数の双方向の通信チャネルを有し、前記親局が前記子局に対して周期的にポーリング信号を送信し、ポーリング信号を受信した子局が通信要求を送信し、通信要求を受信した親局が該子局との間に通信チャネルを割り当てる通信システムに用いられるポーリング方式であって、
前記親局は、下り通信チャネルとして、複数の通信チャネルを時分割多重したＴＤＭ回線を使用して、回線の割り当てられていない下り通信チャンネルを介して、前記回線の割り当てられていない子局に対してポーリング信号を同時に送信し、ポーリング信号を受信した複数の子局が、ポーリング信号を受信した下り通信チャネルと対を成す上り通信チャネルを介して、同時に通信要求を送信することを特徴とするポーリング方式。 The master station is composed of a master station and a plurality of slave stations, and has a plurality of bidirectional communication channels for performing communication between the master station and the slave stations, and the master station periodically polls the slave stations. A polling method used in a communication system that transmits a signal, a slave station that receives a polling signal transmits a communication request, and a master station that receives the communication request allocates a communication channel with the slave station,
The master station uses, as a downlink communication channel, a TDM line obtained by time-division-multiplexing a plurality of communication channels, via a downlink communication channel to which no line is assigned, to a slave station to which the line is not assigned. Polling is characterized in that a polling signal is transmitted simultaneously, and a plurality of slave stations that have received the polling signal simultaneously transmit a communication request via an upstream communication channel that is paired with a downstream communication channel that has received the polling signal. method. 親局と複数の子局とからなり、前記親局と前記子局との間で通信を行なう複数の双方向の通信チャネルを有し、前記親局が前記子局に対して周期的にポーリング信号を送信し、ポーリング信号を受信した子局が通信要求を送信し、通信要求を受信した親局が該子局との間に通信チャネルを割り当てる通信システムに用いられるポーリング方式であって、
前記親局は、下り回線チャンネルを用いて、回線の割り当てられていない前記子局を指定した単一のポーリング信号を送信し、ポーリング信号によって指定された複数の子局が、複数の上り通信チャネルを介して同時に通信要求を送信することを特徴とするポーリング方式。 The master station is composed of a master station and a plurality of slave stations, and has a plurality of bidirectional communication channels for performing communication between the master station and the slave stations, and the master station periodically polls the slave stations. A polling method used in a communication system that transmits a signal, a slave station that receives a polling signal transmits a communication request, and a master station that receives the communication request allocates a communication channel with the slave station,
The master station uses a downlink channel to transmit a single polling signal designating the slave station to which no line is assigned, and a plurality of slave stations designated by the polling signal are sent to a plurality of uplink communication channels. A polling method characterized in that a communication request is simultaneously transmitted through a network.
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