JP3899348B2

JP3899348B2 - Transmission system, transmission method, terminal, program, and recording medium

Info

Publication number: JP3899348B2
Application number: JP2004186853A
Authority: JP
Inventors: 治田中; 智則塩見; 明浩竜田; 寛如渡邊; 伸彦荒新
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2004-06-24
Filing date: 2004-06-24
Publication date: 2007-03-28
Anticipated expiration: 2024-06-24
Also published as: JP2006013801A

Description

本発明は、デマンドアサインＴＤＭＡ(Demand Assignment TimeDivision Multiple Access)通信を行う伝送システム、伝送方法および端末に関するものである。例えば、ＬＡＮシステム等の伝送帯域を共有し、収容する装置とその端末に対して送信権を管理する送信権管理装置を備えた伝送システム、伝送方法およびこれらに使用される端末に関するものである。 The present invention relates to a transmission system, a transmission method, and a terminal for performing demand assignment time division multiple access (TDMA) communication. For example, the present invention relates to a transmission system, a transmission method, and a terminal used in the transmission system including a device that shares and accommodates a transmission band such as a LAN system and a transmission right management device that manages the transmission right for the terminal.

以下、従来のデマンドアサインＴＤＭＡ通信を行う伝送システムの実施の形態について、図面を参照しながら説明する。 Hereinafter, an embodiment of a transmission system for performing conventional demand assignment TDMA communication will be described with reference to the drawings.

デマンドアサインＴＤＭＡ通信は、伝送路を時間的に分割して伝送用のタイムスロットを構成し、タイムスロットの各々を複数の端末に割り当てる通信方式として広く知られている。この通信方式では、伝送路の基本周期であるＴＤＭＡフレームが多数のタイムスロットに時間的に分割されており、各端末がこれらのタイムスロットのいずれかを用いて相手端末へ情報を伝送する。相手端末は、多数のタイムスロットの中から自分宛てのタイムスロットを選択して情報を受信する。 Demand-assigned TDMA communication is widely known as a communication method in which a transmission path is divided in time to form a transmission time slot and each time slot is assigned to a plurality of terminals. In this communication method, a TDMA frame, which is a basic period of a transmission path, is divided in time into a number of time slots, and each terminal transmits information to a partner terminal using one of these time slots. The partner terminal selects a time slot addressed to itself from among a number of time slots and receives information.

ＴＤＭＡ通信では、複数の端末が同一のタイムスロットを同時に使用した場合、複数の信号が互いに衝突して正しい伝送ができなくなる。このため、いずれか一つの端末が使用中のタイムスロットは、他の端末が使用しないようにする必要がある。デマンドアサインＴＤＭＡ通信では、この対策として、個々の端末に発呼の都度、空きスロットを選択して割り当てる（例えば、特許文献１参照）。 In TDMA communication, when a plurality of terminals simultaneously use the same time slot, a plurality of signals collide with each other and correct transmission cannot be performed. For this reason, it is necessary to prevent a time slot in use by any one terminal from being used by another terminal. In demand assignment TDMA communication, as a countermeasure, an empty slot is selected and assigned to each terminal each time a call is made (see, for example, Patent Document 1).

図９は、従来例の、デマンドアサインＴＤＭＡ通信を利用したＬＡＮシステムの構成ブロック図である。 FIG. 9 is a block diagram showing the configuration of a conventional LAN system using demand-assigned TDMA communication.

図９のＬＡＮシステムは、端末７１１〜７１ｎ、送信権管理装置７２、端末７１１〜７１ｎと送信権管理装置７２を接続する単一の周波数帯域を使用する同軸伝送路７３で構成されている。 The LAN system in FIG. 9 includes terminals 711 to 71n, a transmission right management device 72, and a coaxial transmission line 73 that uses a single frequency band connecting the terminals 711 to 71n and the transmission right management device 72.

端末７１１〜７１ｎは、それぞれ、同軸伝送路７３から他の端末７１１〜７１ｎや送信権管理装置７２の信号を受信する受信部７４１、同軸伝送路７３へ他の端末７１１〜７１ｎや送信権管理装置７２への信号を送信する送信部７４２、送信先情報と送信元情報から送信要求情報を生成する送信要求生成部７４３、受信部７４１で受信した送信権情報により伝送情報の送受信を制御する送受信伝送制御部７４４を備えている。 The terminals 711 to 71n respectively receive signals from other terminals 711 to 71n and the transmission right management device 72 from the coaxial transmission line 73, and other terminals 711 to 71n and transmission right management apparatuses to the coaxial transmission line 73. A transmission unit 742 that transmits a signal to 72, a transmission request generation unit 743 that generates transmission request information from transmission destination information and transmission source information, and transmission / reception transmission that controls transmission / reception of transmission information by transmission right information received by the reception unit 741 A control unit 744 is provided.

送信権管理装置７２は、同軸伝送路７３から各端末７１１〜７１ｎの信号を受信する受信部７５１、同軸伝送路７３へ各端末７１１〜７１ｎへの信号を送信する送信部７５２、受信部７５１で受信した信号から端末７１１〜７１ｎの送信要求情報を抽出し、送信先の端末情報と送信元の端末情報から送信権割当を処理する送信権割当処理部７５３、送信権割当処理部７５３で割当てられた送信権から送信権を要求してきた端末７１１〜７１ｎへの送信権情報を生成する送信権情報生成部７５４を備えている。 The transmission right management device 72 includes a reception unit 751 that receives signals from the terminals 711 to 71n from the coaxial transmission line 73, a transmission unit 752 that transmits signals to the terminals 711 to 71n to the coaxial transmission line 73, and a reception unit 751. The transmission request information of the terminals 711 to 71n is extracted from the received signal and assigned by the transmission right assignment processing unit 753 and the transmission right assignment processing unit 753 that process transmission right assignment from the terminal information of the transmission destination and the terminal information of the transmission source. A transmission right information generation unit 754 that generates transmission right information from the transmission right to the terminals 711 to 71n that have requested the transmission right.

図１０は、図９に示すＬＡＮシステムのタイムフレームである。 FIG. 10 is a time frame of the LAN system shown in FIG.

タイムフレームは、端末が送信要求を送信する送信要求期間８１、送信権管理装置で割当てた送信権情報を送信する送信権通知期間８２、端末が情報を伝送する情報伝送期間８３のフレームで構成される。１つの端末に割当てられた他の端末との情報伝送期間が１つのフレームを構成しており、情報伝送期間８３は、各端末におけるこの情報伝送期間を示す複数のフレームで構成されている。ここでは、端末７１１に割当てられた端末７１１と端末７１２間の情報伝送期間を示すフレームを８４とする。 The time frame includes a transmission request period 81 in which the terminal transmits a transmission request, a transmission right notification period 82 in which transmission right information assigned by the transmission right management apparatus is transmitted, and an information transmission period 83 in which the terminal transmits information. The An information transmission period with another terminal assigned to one terminal constitutes one frame, and an information transmission period 83 is composed of a plurality of frames indicating the information transmission period in each terminal. Here, the frame indicating the information transmission period between the terminal 711 and the terminal 712 assigned to the terminal 711 is 84.

図１１は、図９に示すＬＡＮシステムの送信要求情報の構成である。 FIG. 11 shows a configuration of transmission request information of the LAN system shown in FIG.

送信要求情報は、送信先端末情報９１（端末ＩＤ等）と、送信元端末情報９２（端末ＩＤ等）で構成されている。 The transmission request information includes transmission destination terminal information 91 (terminal ID and the like) and transmission source terminal information 92 (terminal ID and the like).

図１２は、図９に示すＬＡＮシステムの送信権情報の構成である。 FIG. 12 shows a configuration of transmission right information of the LAN system shown in FIG.

送信権情報は、各端末ごとの、割当てられた送信権の送信先端末情報１０１（端末ＩＤ等）、割当てられた送信権の送信元端末情報１０２（端末ＩＤ等）、割当てられた送信期間情報１０３の複数の組み合わせで構成されている。 The transmission right information includes, for each terminal, transmission destination terminal information 101 (terminal ID and the like) of the assigned transmission right, transmission source terminal information 102 (terminal ID and the like) of the assigned transmission right, and assigned transmission period information. 103 is composed of a plurality of combinations.

以下に、図９に示すＬＡＮシステムで、端末７１１から端末７１２へ伝送を行う場合の、端末７１１〜７１ｎと送信権管理装置７２における動作について説明する。 Hereinafter, operations in the terminals 711 to 71n and the transmission right management apparatus 72 when transmission is performed from the terminal 711 to the terminal 712 in the LAN system illustrated in FIG. 9 will be described.

端末７１１は、送信要求生成部７４３で、送信先である端末７１２の送信先端末情報９１（端末ＩＤ等）と、送信元である自端末７１１の送信元端末情報９２から送信要求情報を生成する。そして、送信要求期間８１に、送信部７４２は、送信要求情報を、同軸伝送路７３を通して、送信権管理装置７２へ送信する。 In the transmission request generation unit 743, the terminal 711 generates transmission request information from the transmission destination terminal information 91 (terminal ID and the like) of the terminal 712 that is the transmission destination and the transmission source terminal information 92 of the terminal 711 that is the transmission source. . Then, the transmission request period 81, the transmission unit 742, a transmission request information, through the coaxial transmission line 73, and transmits to the transmission right management device 72.

送信権管理装置７２は、受信部７５１で、同軸伝送路７３からの伝送情報を受信する。そして、送信権割当処理部７５３で、送信要求期間８１に受信した伝送情報から送信要求情報を抽出し、送信先端末情報９１（この場合は端末７１２）と送信元端末情報９２（この場合は端末７１１）から端末７１１〜７１ｎ（この場合は端末７１１）への送信権の割当処理を行う。送信権割当処理部７５３は、同様に、他の各端末間（端末７１１〜７１ｎと自端末以外の端末７１１〜７１ｎ間）の送信権の割当処理も行なう。 The transmission right management device 72 receives the transmission information from the coaxial transmission path 73 at the receiving unit 751. Then, the transmission right allocation processing unit 753 extracts the transmission request information from the transmission information received in the transmission request period 81, and transmits the destination terminal information 91 (in this case, the terminal 712) and the transmission source terminal information 92 (in this case, the terminal 711) to the terminals 711 to 71n (in this case, the terminal 711). Similarly, the transmission right allocation processing unit 753 performs transmission right allocation processing between other terminals (between the terminals 711 to 71n and the terminals 711 to 71n other than the terminal itself).

そして、送信権情報生成部７５４において、送信権割当処理部７５３で割当てられた送信権から、送信先端末情報１０１と送信元端末情報１０２と送信期間情報１０３とで構成される端末７１１〜７１ｎへの送信権情報（図１２参照）を生成する。そして、送信部７５２は、送信権通知期間８２に、この送信権情報を、同軸伝送路７３を通して、端末７１１〜７１ｎへ送信する。 Then, in the transmission right information generation unit 754, from the transmission right assigned by the transmission right assignment processing unit 753 to the terminals 711 to 71n configured by the transmission destination terminal information 101, the transmission source terminal information 102, and the transmission period information 103. Transmission right information (see FIG. 12) is generated. Then, the transmission unit 752 transmits the transmission right information to the terminals 711 to 71n through the coaxial transmission line 73 during the transmission right notification period 82.

端末７１１は、送信権通知期間８２に、受信部７４１で、同軸伝送路７３からの送信権情報を受信する。そして、送信先端末情報１０１と送信元端末情報１０２と送信期間情報１０３で割当てられた、情報伝送期間８３の内の端末７１１と端末７１２間の情報伝送期間８４に、送信部７４２が同軸伝送路７３を通して端末７１２へ伝送情報を送信するように、送受信伝送制御部７４４が制御する。 In the transmission right notification period 82, the terminal 711 receives the transmission right information from the coaxial transmission path 73 by the reception unit 741. Then, in the information transmission period 84 between the terminal 711 and the terminal 712 within the information transmission period 83 assigned by the transmission destination terminal information 101, the transmission source terminal information 102, and the transmission period information 103, the transmission unit 742 transmits the coaxial transmission line. The transmission / reception transmission control unit 744 controls the transmission information to be transmitted to the terminal 712 through 73.

一方、端末７１２は、送信権通知期間８２に、受信部７４１で、同軸伝送路７３からの送信権情報を受信する。そして、送信先端末情報１０１と送信元端末情報１０２と送信期間情報１０３で割当てられた情報伝送期間８３の内の端末７１１と端末７１２間の情報伝送期間８４に、受信部７４１が端末７１１からの伝送情報を受信するように、送受信伝送制御部７４４が制御する。 On the other hand, in the transmission right notification period 82, the terminal 712 receives transmission right information from the coaxial transmission path 73 by the reception unit 741. Then, during the information transmission period 84 between the terminal 711 and the terminal 712 within the information transmission period 83 assigned by the transmission destination terminal information 101, the transmission source terminal information 102, and the transmission period information 103, the reception unit 741 receives the signal from the terminal 711. The transmission / reception transmission control unit 744 controls to receive the transmission information.

このようにして、端末７１１〜７１ｎが送信要求を送信権管理装置７２に送信し、送信権管理装置７２が送信要求により送信権の割当を行うことにより、各端末間での情報の伝送が行える。
特開平２−１８３６４４号公報 In this way, the terminals 711 to 71n transmit a transmission request to the transmission right management device 72, and the transmission right management device 72 assigns the transmission right according to the transmission request, whereby information can be transmitted between the terminals. .
JP-A-2-183644

しかしながら、上記した従来の伝送制御方法では、端末間の通信は、決められた伝送条件によってのみ通信されるので、必ずしも最適な通信条件で通信されるとはいえない。例えば、変調方式や周波数帯などの違いで、より伝送効率の高い伝送条件があっても、その伝送条件による通信ができない。 However, in the above-described conventional transmission control method, communication between terminals is performed only under a predetermined transmission condition, so that it cannot be said that communication is always performed under an optimal communication condition. For example, even if there is a transmission condition with higher transmission efficiency due to a difference in modulation method or frequency band, communication based on the transmission condition is not possible.

伝送効率の高い伝送条件は、どの端末間においても同一の条件であるとは限らず、端末間ごとに、その条件が異なる場合がある。 Transmission conditions with high transmission efficiency are not necessarily the same between terminals, and the conditions may be different between terminals.

特に、同軸ケーブルによるネットワークでは、分配器を介することにより、その減衰量が非常に大きくなる。そして、減衰量の大きな端末間では、変調方式の違いにより伝送品質が異なり、端末間によって、伝送品質のよい条件が異なる。同様に、周波数帯の違いによって伝送品質が異なり、端末間によって、伝送品質のよい周波数帯の条件が異なり、低い周波数帯ほど伝送品質がよくなるとは限らない。 In particular, in a network using coaxial cables, the amount of attenuation becomes very large by passing through a distributor. And between terminals with a large amount of attenuation, the transmission quality differs depending on the modulation method, and the conditions for good transmission quality differ between terminals. Similarly, the transmission quality differs depending on the frequency band, the conditions of the frequency band with good transmission quality differ between terminals, and the transmission quality is not necessarily improved in the lower frequency band.

一般家庭には、通常、テレビを見るための、同軸ケーブルのネットワークが備えられている。このネットワークを使用できれば、容易にかつ安価にネットワーク環境を構築することが可能となる。伝送品質のよい伝送条件で各端末間の通信を行わせるようにすれば、この一般家庭に備えられている同軸ケーブルのネットワークを、端末間の伝送のためのネットワークとして使用することが可能となる。 A typical home is usually equipped with a network of coaxial cables for watching television. If this network can be used, a network environment can be easily and inexpensively constructed. If communication between terminals is performed under transmission conditions with good transmission quality, a coaxial cable network provided in a general home can be used as a network for transmission between terminals. .

本発明は、上記従来の課題を解決するもので、端末間ごとに、伝送効率の高い伝送条件を用いて通信できる、伝送システム、伝送方法および端末を提供することを目的とする。 The present invention solves the above-described conventional problems, and an object of the present invention is to provide a transmission system, a transmission method, and a terminal that can communicate with each other using transmission conditions with high transmission efficiency.

上述した課題を解決するために、第１の本発明は、
信号を送受信する複数の端末と、
前記各端末間で信号を送受信する時間帯を管理し割り当てる送信権管理装置と、
前記複数の端末および前記送信権管理装置のそれぞれを互いに通信させる伝送路とを備える伝送システムにおいて、
前記複数の端末のそれぞれは、
他の端末との間の伝送路状態を、伝送仕様の一つである周波数帯毎に、その他の伝送仕様について検査する伝送路状態検査部と、
前記伝送路状態の検査結果を伝送路情報として保持する伝送路状態保持部と、
前記伝送路状態保持部に保持した前記伝送路情報に基づいて、他の端末と通信する際の、複数の前記伝送仕様の組み合わせである所定の伝送条件を決定する伝送条件決定手段とを有し、
決定した前記伝送条件の各伝送仕様を利用して伝送する、伝送システムである。 In order to solve the above-described problem, the first aspect of the present invention provides:
Multiple terminals that send and receive signals;
A transmission right management device for managing and assigning a time zone for transmitting and receiving signals between the terminals;
In a transmission system comprising a transmission path for communicating each of the plurality of terminals and the transmission right management device with each other,
Each of the plurality of terminals is
A transmission line state inspection unit that inspects the transmission line state with other terminals for each transmission specification for each frequency band that is one of the transmission specifications ;
A transmission line state holding unit for holding the inspection result of the transmission line state as transmission line information;
Based on the transmission path information held in the transmission path state holding unit, it possesses in communicating with other terminals, and a transmission condition determining means for determining the predetermined transmission condition is a combination of a plurality of the transmission specifications ,
It is a transmission system which transmits using each transmission specification of the determined transmission conditions .

第２の本発明は、
前記複数の端末のそれぞれは、さらに、
決定した前記伝送条件の情報を送信先の端末に送信する伝送条件送信手段と、
送信元の端末から送信されてくる伝送条件の情報を受信する伝送条件受信手段とを有し、
送信元の端末は、送信先の端末に伝送データを送信する前に前記伝送条件の情報を送信し、前記伝送条件を用いて前記伝送データを前記送信先の端末に送信する、第１の本発明の伝送システムである。 The second aspect of the present invention
Each of the plurality of terminals further includes:
Transmission condition transmitting means for transmitting information on the determined transmission condition to a destination terminal;
Transmission condition receiving means for receiving transmission condition information transmitted from the terminal of the transmission source,
Source terminal transmits information of the transmission conditions before transmitting the transmission data to the transmission destination terminal, and transmits the transmission data to the transmission destination terminal using the transmission condition, first the It is the transmission system of the invention.

第３の本発明は、
前記その他の伝送仕様には、異なる変調方式および伝送帯域幅の組み合わせによる複数の伝送方法が含まれる、第１の本発明の伝送システムである。 The third aspect of the present invention provides
Wherein the other transmission specifications, includes a plurality of transmission method according to the combination of different modulation schemes and transmission bandwidth, a first transmission system of the present invention.

第４の本発明は、
前記伝送路状態は、伝送速度であり、
決定される前記伝送条件は、検査した伝送路状態のうちで伝送速度が最も速くなる条件である、第１の本発明の伝送システムである。 The fourth invention relates to
The transmission path state is a transmission speed,
The transmission condition to be determined is the transmission system according to the first aspect of the present invention, which is a condition in which the transmission speed is the highest among the inspected transmission path conditions.

第５の本発明は、
前記伝送路状態検査部は、一定期間ごとに、それぞれの他の端末との間の伝送路状態を繰り返し検査する、第１の本発明の伝送システムである。 The fifth aspect of the present invention relates to
The transmission line state inspection unit is the transmission system according to the first aspect of the present invention, which repeatedly inspects a transmission line state with each other terminal at regular intervals.

第６の本発明は、
前記伝送路は、複数の同軸ケーブルと、一の同軸ケーブルの信号を他の複数の同軸ケーブルの信号に分岐させる分配器とを有する、第１の本発明の伝送システムである。 The sixth invention relates to
The transmission line is the transmission system according to the first aspect of the present invention, comprising a plurality of coaxial cables and a distributor for branching a signal of one coaxial cable into signals of another plurality of coaxial cables.

第７の本発明は、
信号を送受信する複数の端末と、
前記各端末間で信号を送受信する時間帯を管理し割り当てる送信権管理装置と、
前記複数の端末および前記送信権管理装置のそれぞれを互いに通信させる伝送路とを備える伝送システムの伝送方法において、
前記複数の端末のそれぞれは、
他の端末との間の伝送路状態を、伝送仕様の一つである周波数帯毎に、その他の伝送仕様について検査し、その検査結果を保持するステップと、
前記検査結果に基づいて、他の端末と通信する際の、複数の前記伝送仕様の組み合わせである所定の伝送条件を決定するステップと、
決定した前記伝送条件の各伝送仕様を利用して伝送するステップとを有する、伝送方法である。 The seventh invention relates to
Multiple terminals that send and receive signals;
A transmission right management device for managing and assigning a time zone for transmitting and receiving signals between the terminals;
In a transmission method of a transmission system comprising a transmission path for communicating each of the plurality of terminals and the transmission right management device with each other,
Each of the plurality of terminals is
Inspecting the transmission path state with other terminals for other transmission specifications for each frequency band that is one of the transmission specifications, and holding the inspection results ;
Determining a predetermined transmission condition that is a combination of a plurality of the transmission specifications when communicating with another terminal based on the inspection result ;
A transmission method using each transmission specification of the determined transmission conditions .

第８の本発明は、
第１の本発明の伝送システムの複数の端末のそれぞれの、
他の端末との間の伝送路状態を、周波数帯毎に、その他の伝送仕様について検査する前記伝送路状態検査部、
および、前記伝送路情報に基づいて、他の端末と通信する際の伝送条件を決定する前記伝送条件決定手段、としてコンピュータを機能させるためのプログラムである。 The eighth invention relates to
Each of the plurality of terminals of the transmission system of the first aspect of the present invention,
The transmission line state inspection unit that inspects the transmission line state with other terminals for other transmission specifications for each frequency band ,
And, based on the previous SL transmission path information, a program for causing a computer to function the transmission condition determining means for determining a transmission condition in communicating with other terminals, as.

第９の本発明は、
第８の本発明のプログラムを記録した記録媒体であって、コンピュータで利用可能な記録媒体である。 The ninth invention relates to
A recording medium on which the program of the eighth aspect of the present invention is recorded, and is a recording medium that can be used by a computer.

第１０の本発明は、
複数の他のそれぞれの端末との間の伝送路状態を、伝送仕様の一つである周波数帯毎に、その他の伝送仕様について検査する伝送路状態検査部と、
前記伝送路状態の検査結果を伝送路情報として保持する伝送路状態保持部と、
前記伝送路状態保持部に保持した前記伝送路情報に基づいて、他の端末と通信する際の、複数の前記伝送仕様の組み合わせである所定の伝送条件を決定する伝送条件決定手段とを備え、
決定した前記伝送条件の各伝送仕様を利用して伝送する、時分割多重通信用端末である。 The tenth aspect of the present invention is
A transmission path state inspection unit that inspects transmission path states between a plurality of other terminals for other transmission specifications for each frequency band that is one of the transmission specifications ;
A transmission line state holding unit for holding the inspection result of the transmission line state as transmission line information;
Transmission condition determining means for determining a predetermined transmission condition that is a combination of a plurality of the transmission specifications when communicating with other terminals based on the transmission path information held in the transmission path state holding unit ,
It is a time division multiplex communication terminal that transmits using each transmission specification of the determined transmission conditions .

本発明により、端末間ごとに、伝送効率の高い伝送条件を用いて通信できる、伝送システム、伝送方法および端末を提供できる。 According to the present invention, it is possible to provide a transmission system, a transmission method, and a terminal that can communicate with each other using transmission conditions with high transmission efficiency.

以下、本発明の実施の形態を、図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

まず、本発明の伝送システムの理解を容易にするために、本発明の特徴について説明する。図１は、本発明の特徴を説明するための、伝送システムの概要ブロック図である。 First, in order to facilitate understanding of the transmission system of the present invention, features of the present invention will be described. FIG. 1 is a schematic block diagram of a transmission system for explaining the features of the present invention.

図１に示す伝送システムは、複数の端末２１０〜２１ｎと送信権管理装置２２０が、伝送路２４０に接続されている。各端末２１０〜２１ｎは、他の端末２１０〜２１ｎとの通信のための時間を送信権管理装置２２０に要求し、送信権管理装置２２０は、各端末間の通信のための時間帯の割り当てをし、その割り当てた時間帯（送信権）を各端末２１０〜２１ｎに通知する。そして、各端末２１０〜２１ｎは、その割り当てられた時間帯に他の端末との通信を行う。 In the transmission system illustrated in FIG. 1, a plurality of terminals 210 to 21 n and a transmission right management device 220 are connected to a transmission path 240. Each terminal 210 to 21n requests the transmission right management device 220 for time for communication with the other terminals 210 to 21n, and the transmission right management device 220 allocates a time zone for communication between the terminals. Then, the assigned time zone (transmission right) is notified to each of the terminals 210 to 21n. And each terminal 210-21n communicates with another terminal in the allocated time slot | zone.

以上の構成および動作は、一般的なデマンドアサインＴＤＭＡ通信を行う伝送システムの構成および動作であるが、本発明の伝送システムは、それぞれの端末２１０〜２１ｎが、以下の特徴的な手段を備えている。 The above configuration and operation are the configuration and operation of a transmission system that performs general demand assignment TDMA communication. In the transmission system of the present invention, each of the terminals 210 to 21n includes the following characteristic means. Yes.

特徴的な手段として、端末２１０〜２１ｎは、それぞれ、伝送路情報取得手段２３１および伝送条件決定手段２３２を備えている。 As characteristic means, each of the terminals 210 to 21n includes a transmission path information acquisition means 231 and a transmission condition determination means 232, respectively.

伝送路情報取得手段２３１は、伝送路２４０を介した他の端末との間の伝送路における、複数の伝送条件のそれぞれについての伝送路情報を取得する。伝送路情報とは、他の端末との間における伝送路の状態や性能を示す情報である。そして、伝送条件決定手段２３２が、取得した複数の伝送路情報のうち、他の端末ごとの通信のために最適な伝送路情報を選択し、他の端末ごとの通信に用いる伝送条件を決定する。 The transmission path information acquisition unit 231 acquires transmission path information for each of a plurality of transmission conditions in a transmission path with another terminal via the transmission path 240. The transmission path information is information indicating the state and performance of the transmission path with other terminals. Then, the transmission condition determining means 232 selects the optimum transmission path information for communication for each other terminal from among the acquired plurality of transmission path information, and determines the transmission condition used for communication for each other terminal. .

本発明の伝送システムの特徴は、各端末２１０〜２１ｎが、他の端末２１０〜２１ｎとの間の通信で使用する伝送条件を、他の端末ごとに決定する点である。 A feature of the transmission system of the present invention is that each terminal 210 to 21n determines a transmission condition to be used for communication with another terminal 210 to 21n for each other terminal.

以下、本発明の伝送システムの、具体的な実施の形態について説明する。 Hereinafter, specific embodiments of the transmission system of the present invention will be described.

（実施の形態１）
図２は、本発明の実施の形態１の同軸伝送システムの構成ブロック図である。 (Embodiment 1)
FIG. 2 is a block diagram showing the configuration of the coaxial transmission system according to Embodiment 1 of the present invention.

本実施の形態１の同軸伝送システムは、端末１１１〜１１ｎ、送信権管理装置１２、端末１１１〜１１ｎと送信権管理装置１２を接続する複数の周波数帯域を使用する同軸伝送路１３で構成されている。なお、端末１１１〜１１ｎとは、２台以上の同じ構成の複数の端末を示しており、その台数に特に制限はない。 The coaxial transmission system according to the first embodiment includes terminals 111 to 11n, a transmission right management device 12, and a coaxial transmission line 13 that uses a plurality of frequency bands that connect the terminals 111 to 11n and the transmission right management device 12. Yes. The terminals 111 to 11n indicate two or more terminals having the same configuration, and the number of terminals is not particularly limited.

ここで、同軸伝送路１３には、一般家庭に設けられている、テレビ用に敷設された同軸ケーブルのネットワークを用いている。したがって、端末１１１〜１１ｎ、および送信権管理装置１２は、同軸ケーブルと分配器を介して接続されている。 Here, the coaxial transmission line 13 is a coaxial cable network installed in a general household and installed for television. Therefore, the terminals 111 to 11n and the transmission right management device 12 are connected to the coaxial cable via the distributor.

端末１１１〜１１ｎは、それぞれ、同軸伝送路１３から他の端末１１１〜１１ｎや送信権管理装置１２の信号を受信する受信部１４１、同軸伝送路１３へ他の端末１１１〜１１ｎや送信権管理装置１２への信号を送信する送信部１４２、自端末以外の他の端末１１１〜１１ｎとの間での伝送路状態を検査する伝送路状態検査部１４３、伝送路状態検査部１４３に伝送路状態を検査する指示を行う伝送路状態検査制御部１４４、伝送路状態検査部１４３で検査した複数の周波数帯域の伝送路状態を保持する伝送路状態保持部１４５、送信先情報と送信元情報から送信要求情報を生成する送信要求生成部１４６、受信部１４１を利用して送信権情報を取得する割当時間取得部１４９、割当時間取得部１４９で取得した送信権情報に基づいて伝送情報の送受信を制御する送受信伝送制御部１４７を備えている。 Each of the terminals 111 to 11n receives a signal from the other terminals 111 to 11n and the transmission right management device 12 from the coaxial transmission line 13, and the other terminals 111 to 11n and the transmission right management device to the coaxial transmission line 13. The transmission path state is transmitted to the transmission section 142 for transmitting a signal to 12, the transmission path state inspection section 143 for inspecting the transmission path state with other terminals 111 to 11n other than the own terminal, and the transmission path state inspection section 143. A transmission path state inspection control unit 144 that gives an instruction to inspect, a transmission path state holding unit 145 that holds transmission path states of a plurality of frequency bands inspected by the transmission path state inspection unit 143, a transmission request from transmission destination information and transmission source information A transmission request generation unit 146 that generates information, an allocation time acquisition unit 149 that acquires transmission right information using the reception unit 141, and transmission information based on the transmission right information acquired by the allocation time acquisition unit 149. And a reception transmission control unit 147 controls transmission and reception of.

また、送受信伝送制御部１４７は、受信部１４１で受信した送信権情報と伝送路状態保持部１４５で保持される伝送路情報から送受信を行う周波数帯を決定する伝送条件決定部１６０を有している。なお、伝送条件決定部１６０は、本発明の伝送条件決定手段の一例である。 The transmission / reception transmission control unit 147 has a transmission condition determination unit 160 that determines a frequency band for transmission / reception from the transmission right information received by the reception unit 141 and the transmission path information held by the transmission path state holding unit 145. Yes. The transmission condition determining unit 160 is an example of the transmission condition determining means of the present invention.

また、送受信伝送制御部１４７は、送信部１４２と受信部１４１の使用周波数帯を、その決定した周波数帯に切り替える周波数帯切替部１４８も有している。 The transmission / reception transmission control unit 147 also includes a frequency band switching unit 148 that switches the used frequency band of the transmission unit 142 and the reception unit 141 to the determined frequency band.

送信権管理装置１２は、同軸伝送路１３から各端末１１１〜１１ｎの信号を受信する受信部１５１、同軸伝送路１３へ各端末１１１〜１１ｎへの信号を送信する送信部１５２、受信部１５１で受信した信号から端末１１１〜１１ｎの送信要求情報を抽出し、送信先の端末情報と送信元の端末情報から送信権割当を処理する送信権割当処理部１５３、送信権割当処理部１５３で割当てられた送信権から送信権を要求してきた端末１１１〜１１ｎへの送信権情報を生成する送信権情報生成部１５４を備えている。 The transmission right management device 12 includes a reception unit 151 that receives signals from the terminals 111 to 11n from the coaxial transmission line 13, a transmission unit 152 that transmits signals to the terminals 111 to 11n to the coaxial transmission line 13, and a reception unit 151. The transmission request information of the terminals 111 to 11n is extracted from the received signal, and assigned by the transmission right allocation processing unit 153 and the transmission right allocation processing unit 153 that process transmission right allocation from the terminal information of the transmission destination and the terminal information of the transmission source. A transmission right information generation unit 154 that generates transmission right information from the transmission right to the terminals 111 to 11n that has requested the transmission right.

図３は、本実施の形態１の同軸伝送システムのタイムフレームである。 FIG. 3 is a time frame of the coaxial transmission system according to the first embodiment.

本実施の形態１のタイムフレームは、端末間での伝送路状態を検査する伝送路検査期間２１、端末が送信要求を送信する送信要求期間２２、送信権管理装置１２で割当てた送信権情報を送信する送信権通知期間２３、端末が情報を伝送する情報伝送期間２４の各フレームで構成される。１つの端末に割当てられた他の端末との情報伝送期間が１つのフレームを構成しており、情報伝送期間２４は、各端末におけるこの情報伝送期間を示す複数のフレームで構成されている。情報伝送期間２４の内の２５の部分のフレームが、端末１１１に割当てられた端末１１１と端末１１２間の情報伝送期間を示すフレームである。 The time frame of the first embodiment includes a transmission path inspection period 21 in which a transmission path state between terminals is inspected, a transmission request period 22 in which a terminal transmits a transmission request, and transmission right information assigned by the transmission right management apparatus 12. Each frame is composed of a transmission right notification period 23 for transmission and an information transmission period 24 for transmitting information by the terminal. An information transmission period with another terminal assigned to one terminal constitutes one frame, and the information transmission period 24 is composed of a plurality of frames indicating the information transmission period in each terminal. 25 frames in the information transmission period 24 are frames indicating an information transmission period between the terminal 111 and the terminal 112 allocated to the terminal 111.

図４は、本実施の形態１の同軸伝送システムの送信要求情報の構成である。 FIG. 4 shows a configuration of transmission request information of the coaxial transmission system according to the first embodiment.

送信要求情報は、送信先端末情報３１（端末ＩＤ等）と、送信元端末情報３２（端末ＩＤ等）で構成されている。 The transmission request information includes transmission destination terminal information 31 (terminal ID and the like) and transmission source terminal information 32 (terminal ID and the like).

図５は、本実施の形態１の同軸伝送システムの送信権情報の構成である。 FIG. 5 shows a configuration of transmission right information of the coaxial transmission system according to the first embodiment.

送信権情報は、各端末間ごとの、割当てられた送信権の送信先端末情報４１（端末ＩＤ等）と、割当てられた送信権の送信元端末情報４２（端末ＩＤ等）と、割当てられた送信期間情報４３の、複数の組み合わせで構成されている。 The transmission right information includes, for each terminal, transmission destination terminal information 41 (terminal ID, etc.) of the assigned transmission right, and transmission source terminal information 42 (terminal ID, etc.) of the assigned transmission right. The transmission period information 43 is composed of a plurality of combinations.

図６は、本実施の形態１の同軸伝送システムの使用周波数帯域を示している。使用される周波数帯域は、周波数帯域３０１〜３０ｎで構成されている。 FIG. 6 shows the used frequency band of the coaxial transmission system according to the first embodiment. The frequency band used is composed of frequency bands 301 to 30n.

次に、本実施の形態１の同軸伝送システムで、端末１１１から端末１１２へ伝送を行う場合の、端末１１１〜１１ｎと送信権管理装置１２における動作について説明する。 Next, operations in the terminals 111 to 11n and the transmission right management apparatus 12 when transmission is performed from the terminal 111 to the terminal 112 in the coaxial transmission system according to the first embodiment will be described.

同軸ケーブルによるネットワークは、分配器を介することにより、その減衰量は非常に大きくなる。そして、減衰量の大きな端末間では、変調方式の違いにより伝送品質が異なり、端末間によって、伝送品質のよい条件が異なる。同様に、周波数帯の違いによって伝送品質が異なり、端末間によって、伝送品質のよい周波数帯の条件は異なり、必ずしも低い周波数帯ほど伝送品質がよくなるとは限らない。 The attenuation amount of the network using the coaxial cable becomes very large by passing through the distributor. And between terminals with a large amount of attenuation, the transmission quality differs depending on the modulation method, and the conditions for good transmission quality differ between terminals. Similarly, the transmission quality differs depending on the frequency band, and the conditions of the frequency band with good transmission quality differ between terminals, and the transmission quality is not necessarily improved as the frequency band is lower.

したがって、各端末間での使用周波数帯の伝送路状態が異なることによって、送信権管理装置１２が割当てた送信可能な期間で送信できる伝送量が増減するため、情報の伝送が遅延したり、最悪の場合は伝送が行えなくなってしまう。また、送信権管理装置１２が各端末に効率的に送信期間を割り当てた場合でも、伝送路の状況によって、実際は効率的な通信ができなくなってしまう。 Therefore, since the transmission path state of the used frequency band between the terminals differs, the amount of transmission that can be transmitted in the transmittable period assigned by the transmission right management device 12 increases or decreases. In this case, transmission cannot be performed. Even when the transmission right management device 12 efficiently allocates a transmission period to each terminal, efficient communication cannot actually be performed depending on the condition of the transmission path.

そこで、本実施の形態１の同軸伝送システムでは、端末間ごとに、伝送路状態を検査し、伝送品質のよい伝送条件を選択し、その伝送条件を用いることにより、伝送品質または伝送効率の高い伝送を行えるようにしている。 Therefore, in the coaxial transmission system according to the first embodiment, the transmission path state is inspected for each terminal, transmission conditions with good transmission quality are selected, and the transmission conditions are used, so that transmission quality or transmission efficiency is high. The transmission is made possible.

端末１１１は、まず、端末１１２〜１１ｎとの間での同軸伝送路１３の周波数帯域毎の伝送路情報を保持するために、周波数帯域毎の伝送路状態の検査を行う。そして、その伝送路状態の検査結果を伝送路情報として伝送路状態保持部１４５に保持する。同様に、端末１１２〜１１ｎも、他の端末との間での同軸伝送路１３の周波数帯域毎の伝送路情報を保持するために伝送路状態の検査を行う。 The terminal 111 first checks the transmission path state for each frequency band in order to hold transmission path information for each frequency band of the coaxial transmission path 13 with the terminals 112 to 11n. Then, the transmission path state inspection result is held in the transmission path state holding unit 145 as transmission path information. Similarly, the terminals 112 to 11n also inspect the transmission path state in order to hold transmission path information for each frequency band of the coaxial transmission path 13 with other terminals.

端末１１１の伝送路状態検査部１４３は、伝送路状態検査制御部１４４の指示により、伝送路検査期間２１に、周波数帯域３０１に変調効率（変調方式と伝送帯域幅）が最も高い検査情報を、同軸伝送路１３を通して端末１１２〜１１ｎへ、送信部１４２から送信させる。 The transmission line state inspection unit 143 of the terminal 111 receives inspection information with the highest modulation efficiency (modulation method and transmission bandwidth) in the frequency band 301 in the transmission line inspection period 21 according to an instruction from the transmission line state inspection control unit 144. The transmission unit 142 transmits the data to the terminals 112 to 11n through the coaxial transmission line 13.

一方、端末１１２〜１１ｎでは、受信部１４１で、伝送路検査期間２１に同軸伝送路１３から検査情報を受信する。そして、伝送路状態検査部１４３で、受信した情報に誤りがないかの検査を行い、情報に誤りがない場合は「検査完了」情報を、情報に誤りがある場合は「検査未完了」情報を検査結果情報として、送信部１４２から端末１１１へ送信する。 On the other hand, in the terminals 112 to 11 n, the reception unit 141 receives inspection information from the coaxial transmission line 13 during the transmission line inspection period 21. Then, the transmission path state inspection unit 143 checks whether there is an error in the received information. If there is no error in the information, “inspection complete” information is displayed. If there is an error in the information, “inspection incomplete” information is displayed. Is transmitted from the transmission unit 142 to the terminal 111 as inspection result information.

次に、端末１１１は、受信部１４１で、端末１１２〜１１ｎからの検査結果情報を受信する。そして、検査結果情報が「検査完了」の場合、伝送路状態保持部１４５に検査が完了した時点の変調効率を伝送路情報として保持する。検査結果情報が「検査未完了」の場合、伝送路状態検査部１４３は、伝送路状態検査制御部１４４の指示により、変調効率を下げた検査情報を送信部１４２から端末１１２〜１１ｎへ送信する。「検査完了」の検査結果情報を受信するまで、繰り返しこの検査動作を行う。 Next, the terminal 111 receives the inspection result information from the terminals 112 to 11n by the receiving unit 141. If the inspection result information is “inspection complete”, the transmission path state holding unit 145 holds the modulation efficiency at the time when the inspection is completed as transmission path information. When the inspection result information is “inspection incomplete”, the transmission line state inspection unit 143 transmits inspection information with reduced modulation efficiency from the transmission unit 142 to the terminals 112 to 11 n according to an instruction from the transmission line state inspection control unit 144. . This inspection operation is repeated until “inspection complete” inspection result information is received.

次に、端末１１１の伝送路状態検査部１４３は、伝送路状態検査制御部１４４の指示により、伝送路検査期間２１に、周波数帯域３０２〜３０ｎで同様に伝送路状態を検査し、伝送路状態保持部１４５に周波数帯域毎の伝送路情報を保持する。 Next, the transmission line state inspection unit 143 of the terminal 111 similarly inspects the transmission line state in the frequency band 302 to 30n in the transmission line inspection period 21 according to the instruction of the transmission line state inspection control unit 144, and transmits the transmission line state. The holding unit 145 holds transmission path information for each frequency band.

なお、上記の検査方法は一例であり、適切な変調効率が検出できれば方法は問わない。また、上記の検査方法では、伝送路情報を変調効率としたが、単位時間当たりの伝送速度としても良く、伝送路状態が表現できる情報であれば良い。なお、変調方式と伝送帯域幅の組み合わせは、本発明の伝送仕様の一例である。 Note that the above inspection method is an example, and any method can be used as long as appropriate modulation efficiency can be detected. In the above inspection method, the transmission path information is defined as the modulation efficiency. However, the transmission speed per unit time may be used as long as the information can express the transmission path state. The combination of the modulation method and the transmission bandwidth is an example of the transmission specification of the present invention.

次に、端末１１１は、送信要求生成部１４６で、送信先である端末１１２の送信先端末情報３１と送信元である自端末１１１の送信元端末情報３２とから送信要求情報を生成する。そして、送信部１４２から、送信要求期間２２に同軸伝送路１３を通して、送信権管理装置１２へ、この送信要求情報を送信する。 Next, the terminal 111 uses the transmission request generation unit 146 to generate transmission request information from the transmission destination terminal information 31 of the terminal 112 that is the transmission destination and the transmission source terminal information 32 of the terminal 111 that is the transmission source. Then, the transmission request information is transmitted from the transmission unit 142 to the transmission right management apparatus 12 through the coaxial transmission line 13 in the transmission request period 22.

送信権管理装置１２は、同軸伝送路１３から受信部１５１で伝送情報を受信する。そして、送信権割当処理部１５３は、送信要求期間２２に受信した伝送情報から送信要求情報を抽出し、送信先端末情報３１（この場合は端末１１２）と送信元端末情報３２（この場合は端末１１１）から端末１１１〜１１ｎ（この場合は端末１１１）への送信権の割当処理を行う。そして、送信権情報生成部１５４で、送信権割当処理部１５３で割当てられた送信権から、送信先端末情報４１（この場合は端末１１２）と送信元端末情報４２（この場合は端末１１１）と送信期間情報４３とで構成される端末１１１〜１１ｎ（この場合は端末１１１）への送信権情報を生成する。送信部１５２は、送信権通知期間２３に、同軸伝送路１３を通して端末１１１〜１１ｎへ、この送信権情報を送信する。 The transmission right management device 12 receives transmission information from the coaxial transmission line 13 by the receiving unit 151. Then, the transmission right allocation processing unit 153 extracts the transmission request information from the transmission information received in the transmission request period 22, and transmits the transmission destination terminal information 31 (in this case, the terminal 112) and the transmission source terminal information 32 (in this case, the terminal) 111) to the terminals 111 to 11n (in this case, the terminal 111). Then, the transmission right information generation unit 154 determines the transmission destination terminal information 41 (in this case, the terminal 112) and the transmission source terminal information 42 (in this case, the terminal 111) from the transmission right assigned by the transmission right assignment processing unit 153. Transmission right information to terminals 111 to 11n (in this case, terminal 111) configured with transmission period information 43 is generated. The transmission unit 152 transmits the transmission right information to the terminals 111 to 11n through the coaxial transmission line 13 during the transmission right notification period 23.

端末１１１は、割当時間取得部１４９が、受信部１４１を利用して、送信権通知期間２３に同軸伝送路１３から送信権情報を取得する。そして、その送信権情報が送受信伝送制御部１４７に渡され、伝送条件決定部１６０は、送信権情報の送信先端末情報４１および送信元端末情報４２と、伝送路状態保持部１４５で保持されている端末１１２との間の周波数帯毎の伝送路情報とから、伝送効率が最も高い周波数帯域を選択する。そして、送受信伝送制御部１４７は、周波数帯切替部１４８に周波数の切り替えの指示をする。ここで、伝送効率が最も高い周波数帯域の選択とは、例えば伝送速度が最も速い周波数帯域を選択する。なお、ここで選択される伝送効率が最も高い周波数帯域が、本発明の、決定する伝送条件の一例である。 In the terminal 111, the allocation time acquisition unit 149 uses the reception unit 141 to acquire transmission right information from the coaxial transmission line 13 during the transmission right notification period 23. Then, the transmission right information is passed to the transmission / reception transmission control unit 147, and the transmission condition determination unit 160 is held by the transmission destination terminal information 41 and the transmission source terminal information 42 of the transmission right information and the transmission path state holding unit 145. The frequency band with the highest transmission efficiency is selected from the transmission path information for each frequency band with the terminal 112 that is present. Then, the transmission / reception transmission control unit 147 instructs the frequency band switching unit 148 to switch frequencies. Here, the selection of the frequency band with the highest transmission efficiency, for example, selects the frequency band with the fastest transmission speed. The frequency band with the highest transmission efficiency selected here is an example of the transmission condition to be determined according to the present invention.

そして、送信期間情報４３から得られる情報伝送期間２４内の端末１１１と端末１１２間の情報伝送期間２５に、指示のあった伝送効率が最も高い周波数帯域で、送信部１４２が同軸伝送路１３を通して端末１１２へ伝送情報を送信できるように、周波数帯切替部１４８は、送信部１４２の送信周波数帯を切り替える。 Then, in the information transmission period 25 between the terminal 111 and the terminal 112 in the information transmission period 24 obtained from the transmission period information 43, the transmission unit 142 passes through the coaxial transmission line 13 in the frequency band with the highest transmission efficiency instructed. The frequency band switching unit 148 switches the transmission frequency band of the transmission unit 142 so that transmission information can be transmitted to the terminal 112.

端末１１２は、割当時間取得部１４９が、受信部１４１を利用して、送信権通知期間２３に同軸伝送路１３から送信権情報を取得する。そして、その送信権情報が送受信伝送制御部１４７に渡され、伝送条件決定部１６０は、送信権情報の送信先端末情報４１および送信元端末情報４２と、伝送路状態保持部１４５で保持されている端末１１１との間の周波数帯毎の伝送路情報とから、端末１１１と同じ判断基準で、伝送効率が最も高い周波数帯域を選択する。そして、送受信伝送制御部１４７は、周波数帯切替部１４８に周波数の切り替えの指示をする。なお、ここで選択される伝送効率が最も高い周波数帯域が、本発明の、決定する伝送条件の一例である。 In the terminal 112, the allocation time acquisition unit 149 uses the reception unit 141 to acquire transmission right information from the coaxial transmission line 13 during the transmission right notification period 23. Then, the transmission right information is passed to the transmission / reception transmission control unit 147, and the transmission condition determination unit 160 is held by the transmission destination terminal information 41 and the transmission source terminal information 42 of the transmission right information and the transmission path state holding unit 145. The frequency band with the highest transmission efficiency is selected from the transmission path information for each frequency band between the terminal 111 and the terminal 111 with the same criteria as the terminal 111. Then, the transmission / reception transmission control unit 147 instructs the frequency band switching unit 148 to switch frequencies. The frequency band with the highest transmission efficiency selected here is an example of the transmission condition to be determined according to the present invention.

そして、送信期間情報４３から得られる情報伝送期間２４内の端末１１１と端末１１２間の情報伝送期間２５に、指示のあった伝送効率が最も高い周波数帯域で、受信部１４１が同軸伝送路１３を通して端末１１１から伝送情報を受信できるように、周波数帯切替部１４８は、受信部１４１の受信周波数帯を切り替える。 Then, in the information transmission period 25 between the terminal 111 and the terminal 112 in the information transmission period 24 obtained from the transmission period information 43, the receiving unit 141 passes through the coaxial transmission line 13 in the frequency band with the highest transmission efficiency instructed. to be able to receive transmission information from the terminal 111, the frequency band switching section 148 switches the receiving frequency band of the receiving portion 141.

以上のように、本実施の形態１の同軸伝送システムでは、端末間で使用周波数帯毎の伝送路状態を検査し、検査結果を端末が使用周波数帯域毎に保持する。端末は送信要求を送信権管理装置に送信し、送信権管理装置の送信権割当処理部で、送信権割当の処理を行い、端末に通知する。端末は、送信権を与えられた期間に、伝送を行う端末間の使用周波数帯域毎の伝送路情報を考慮し、最も伝送効率の高い伝送周波数帯域を決定することにより、伝送路状況に対応した伝送効率のよい通信が行える。 As described above, in the coaxial transmission system according to the first embodiment, the transmission path state for each used frequency band is inspected between terminals, and the terminal holds the inspection result for each used frequency band. The terminal transmits a transmission request to the transmission right management device, performs transmission right allocation processing in the transmission right allocation processing unit of the transmission right management device, and notifies the terminal. The terminal responds to the transmission path condition by determining the transmission frequency band with the highest transmission efficiency in consideration of the transmission path information for each used frequency band between the terminals performing transmission during the period when the transmission right is given. Communication with good transmission efficiency can be performed.

（実施の形態２）
図７は、本発明の実施の形態２の同軸伝送システムの構成ブロック図である。なお、実施の形態１の同軸伝送システムと同じ機能を有する構成の部分には同一の番号を付し、その説明を省略する。 (Embodiment 2)
FIG. 7 is a configuration block diagram of the coaxial transmission system according to the second embodiment of the present invention. In addition, the same number is attached | subjected to the part of the structure which has the same function as the coaxial transmission system of Embodiment 1, and the description is abbreviate | omitted.

端末１１１〜１１ｎは、それぞれ、実施の形態１の端末の構成に加えて、送受信伝送制御部２４７の伝送条件決定部１６０で選択された使用周波数帯から送信に使用する周波数帯情報を生成する送信周波数情報生成部５１と、受信部１４１で受信した送信周波数情報から受信を行う周波数帯を取得する受信周波数情報取得部５２とを備えている。 Each of terminals 111 to 11n, in addition to the configuration of the terminal of the first embodiment, transmits to generate frequency band information used for transmission from the used frequency band selected by transmission condition determining unit 160 of transmission / reception transmission control unit 247. A frequency information generation unit 51 and a reception frequency information acquisition unit 52 that acquires a frequency band for reception from the transmission frequency information received by the reception unit 141 are provided.

また、送受信伝送制御部２４７は、受信部１４１で伝送情報を受信する周波数帯を受信周波数情報取得部５２で取得した周波数帯に切り替えるように、周波数帯切替部１４８に指示する。 In addition, the transmission / reception transmission control unit 247 instructs the frequency band switching unit 148 to switch the frequency band in which transmission information is received by the reception unit 141 to the frequency band acquired by the reception frequency information acquisition unit 52.

本実施の形態２の同軸伝送システムのタイムフレームは、図３に示す実施の形態１のタイムフレームと同一構成である。 The time frame of the coaxial transmission system of the second embodiment has the same configuration as the time frame of the first embodiment shown in FIG.

図８は、本実施の形態２の同軸伝送システムの情報伝送フレームの構成である。情報伝送フレームは、端末間で情報を伝送するためのフレームである。 FIG. 8 shows the configuration of the information transmission frame of the coaxial transmission system according to the second embodiment. The information transmission frame is a frame for transmitting information between terminals.

この情報伝送フレームは、使用周波数情報６１と伝送情報６２で構成される。 This information transmission frame includes use frequency information 61 and transmission information 62.

本実施の形態２の同軸伝送システムの送信要求情報は、図４に示す実施の形態１の送信要求情報と同一構成である。 The transmission request information of the coaxial transmission system of the second embodiment has the same configuration as the transmission request information of the first embodiment shown in FIG.

本実施の形態２の同軸伝送システムの送信権情報は、図５に示す実施の形態１の送信権情報と同一構成である。 The transmission right information of the coaxial transmission system of the second embodiment has the same configuration as the transmission right information of the first embodiment shown in FIG.

次に、端末１１１から端末１１２へ伝送を行う場合の、端末１１１〜１１ｎと送信権管理装置１２における動作について説明する。なお、実施の形態１の場合と同じ動作の部分は、その説明を省略する。 Next, operations in the terminals 111 to 11n and the transmission right management apparatus 12 when transmission is performed from the terminal 111 to the terminal 112 will be described. The description of the same operation as in the first embodiment is omitted.

端末１１１は、まず、端末１１２〜１１ｎとの間での同軸伝送路１３の周波数帯域毎の伝送路情報を保持するために周波数帯域毎の伝送路状態の検査を行う。そして、その伝送路状態の検査結果を伝送路情報として伝送路状態保持部１４５に保持する。同様に、端末１１２〜１１ｎも他の端末との間での同軸伝送路１３の周波数帯域毎の伝送路情報を保持するために伝送路状態の検査を行う。 The terminal 111 first checks the transmission path state for each frequency band in order to hold transmission path information for each frequency band of the coaxial transmission path 13 with the terminals 112 to 11n. Then, the transmission path state inspection result is held in the transmission path state holding unit 145 as transmission path information. Similarly, the terminals 112 to 11n also inspect the transmission line state in order to hold transmission line information for each frequency band of the coaxial transmission line 13 with other terminals.

次に、端末１１１は、送信要求生成部１４６で、送信先である端末１１２の送信先端末情報３１と送信元である自端末１１１の送信元端末情報３２とから送信要求情報を生成する。そして、送信部１４２から、送信要求期間２２に同軸伝送路１３を通して、送信権管理装置１２へ、この送信要求情報を送信させる。 Next, the terminal 111 uses the transmission request generation unit 146 to generate transmission request information from the transmission destination terminal information 31 of the terminal 112 that is the transmission destination and the transmission source terminal information 32 of the terminal 111 that is the transmission source. Then, the transmission unit 142 transmits the transmission request information to the transmission right management apparatus 12 through the coaxial transmission line 13 during the transmission request period 22.

送信権管理装置１２は、同軸伝送路１３から受信部１５１で伝送情報を受信する。そして、送信権割当処理部１５３は、送信要求期間２２に受信した伝送情報から送信要求情報を抽出し、送信先端末情報３１（この場合は端末１１２）と送信元端末情報３２（この場合は端末１１１）から、端末１１１〜１１ｎ（この場合は端末１１１）への送信権の割当処理を行う。そして、送信権情報生成部１５４で、送信権割当処理部１５３で割当てられた送信権から、送信先端末情報４１（この場合は端末１１２）と送信元端末情報４２（この場合は端末１１１）と送信期間情報４３とで構成される端末１１１〜１１ｎ（この場合は端末１１１）への送信権情報を生成する。送信部１５２は、送信権通知期間２３に、同軸伝送路１３を通して端末１１１〜１１ｎへ、この送信権情報を送信する。 The transmission right management device 12 receives transmission information from the coaxial transmission line 13 by the receiving unit 151. Then, the transmission right allocation processing unit 153 extracts the transmission request information from the transmission information received in the transmission request period 22, and transmits the transmission destination terminal information 31 (in this case, the terminal 112) and the transmission source terminal information 32 (in this case, the terminal) 111) to the terminals 111 to 11n (in this case, the terminal 111). Then, the transmission right information generation unit 154 determines the transmission destination terminal information 41 (in this case, the terminal 112) and the transmission source terminal information 42 (in this case, the terminal 111) from the transmission right assigned by the transmission right assignment processing unit 153. Transmission right information to terminals 111 to 11n (in this case, terminal 111) configured with transmission period information 43 is generated. The transmission unit 152 transmits the transmission right information to the terminals 111 to 11n through the coaxial transmission line 13 during the transmission right notification period 23.

端末１１１は、割当時間取得部１４９が、受信部１４１を利用して、送信権通知期間２３に同軸伝送路１３から送信権情報を取得する。そして、その送信権情報が送受信伝送制御部２４７に渡され、伝送条件決定部１６０は、送信権情報の送信先端末情報４１および送信元端末情報４２と、伝送路状態保持部１４５で保持されている端末１１２との間の周波数帯毎の伝送路情報とから、伝送効率が最も高い周波数帯域を選択する。ここで、伝送効率が最も高い周波数帯域の選択とは、例えば伝送速度が最も速い周波数帯域を選択する。 In the terminal 111, the allocation time acquisition unit 149 uses the reception unit 141 to acquire transmission right information from the coaxial transmission line 13 during the transmission right notification period 23. Then, the transmission right information is passed to the transmission / reception transmission control unit 247, and the transmission condition determination unit 160 is held in the transmission destination terminal information 41 and the transmission source terminal information 42 of the transmission right information, and the transmission path state holding unit 145. The frequency band with the highest transmission efficiency is selected from the transmission path information for each frequency band with the terminal 112 that is present. Here, the selection of the frequency band with the highest transmission efficiency, for example, selects the frequency band with the fastest transmission speed.

そして、送受信伝送制御部２４７は、周波数帯切替部１４８に周波数の切り替えの指示をする。それとともに、送受信伝送制御部２４７は、送信周波数情報生成部５１に、送信に使用する周波数帯情報を生成させる。そして、送信周波数情報生成部５１は、図８に示す伝送情報６２が送信される前に、使用周波数情報６１を送信先の端末１１２に送信部１４２から送信させる。 Then, the transmission / reception transmission control unit 247 instructs the frequency band switching unit 148 to switch the frequency. At the same time, the transmission / reception transmission control unit 247 causes the transmission frequency information generation unit 51 to generate frequency band information used for transmission. Then, the transmission frequency information generation unit 51 causes the transmission unit 142 to transmit the used frequency information 61 to the transmission destination terminal 112 before the transmission information 62 illustrated in FIG. 8 is transmitted.

そして、送信期間情報４３で示される情報伝送期間２４内の端末１１１と端末１１２間の情報伝送期間２５に、指示のあった伝送効率が最も高い周波数帯域で、送信部１４２が同軸伝送路１３を通して端末１１２へ周波数帯情報と伝送情報を送信できるように、周波数帯切替部１４８は、送信部１４２の送信周波数帯を切り替える。 Then, in the information transmission period 25 between the terminals 111 and 112 within the information transmission period 24 indicated by the transmission period information 43, the transmission unit 142 passes through the coaxial transmission line 13 in the frequency band with the highest transmission efficiency instructed. The frequency band switching unit 148 switches the transmission frequency band of the transmission unit 142 so that the frequency band information and the transmission information can be transmitted to the terminal 112.

端末１１２は、割当時間取得部１４９が、受信部１４１を利用して、送信権通知期間２３に同軸伝送路１３から送信権情報を取得する。そして、その送信権情報が送受信伝送制御部２４７に渡され、送受信伝送制御部２４７は、情報伝送期間２４内の端末１１１と端末１１２間の情報伝送期間２５に、端末１１１から送信されてくる図８に示す情報伝送フレームを、受信部１４１に受信させる。 In the terminal 112, the allocation time acquisition unit 149 uses the reception unit 141 to acquire transmission right information from the coaxial transmission line 13 during the transmission right notification period 23. The transmission right information is transferred to the transmission / reception transmission control unit 247, and the transmission / reception transmission control unit 247 is transmitted from the terminal 111 during the information transmission period 25 between the terminal 111 and the terminal 112 in the information transmission period 24. 8 receives the information transmission frame shown in FIG.

そして、受信周波数情報取得部５２は、この情報伝送フレームに含まれる使用周波数情報６１を取得する。そして、その使用周波数情報６１が送受信伝送制御部２４７に渡され、送受信伝送制御部２４７は、情報伝送フレームに含まれる伝送情報６２を、受信周波数情報取得部５２で取得された使用周波数情報の周波数帯で受信できるように、周波数帯切替部１４８に周波数の切り替えの指示をする。そして、周波数帯切替部１４８が受信部１４１の受信周波数帯をその周波数帯に切り替え、受信部１４１は、その周波数帯で端末１１１からの伝送情報６２を受信する。 Then, the reception frequency information acquisition unit 52 acquires the use frequency information 61 included in this information transmission frame. Then, the used frequency information 61 is passed to the transmission / reception transmission control unit 247, and the transmission / reception transmission control unit 247 converts the transmission information 62 included in the information transmission frame into the frequency of the used frequency information acquired by the reception frequency information acquisition unit 52. The frequency band switching unit 148 is instructed to switch the frequency so that it can be received in the band. Then, the frequency band switching unit 148 switches the reception frequency band of the reception unit 141 to the frequency band, and the reception unit 141 receives the transmission information 62 from the terminal 111 in the frequency band.

以上のように、本実施の形態２の同軸伝送システムでは、端末間で使用周波数帯毎の伝送路状態を検査し、検査結果を端末が使用周波数帯域毎に保持する。端末は送信要求を送信権管理装置に送信し、送信権管理装置の送信権割当処理部で、送信権割当の処理を行い、端末に通知する。端末は、送信権を与えられた期間に、伝送を行う端末間の使用周波数帯域毎の伝送路情報を考慮し、最も伝送効率の高い伝送周波数帯域を決定し、使用周波数帯域を送信先端末に通知することにより、受信端末の処理の簡略化を図るとともに、伝送効率のよい通信が行える。 As described above, in the coaxial transmission system according to the second embodiment, the transmission path state for each used frequency band is inspected between terminals, and the terminal holds the inspection result for each used frequency band. The terminal transmits a transmission request to the transmission right management device, performs transmission right allocation processing in the transmission right allocation processing unit of the transmission right management device, and notifies the terminal. The terminal determines transmission frequency band with the highest transmission efficiency in consideration of transmission path information for each used frequency band between terminals performing transmission during the period when the transmission right is given, and sets the used frequency band to the destination terminal. By notifying, it is possible to simplify the processing of the receiving terminal and perform communication with high transmission efficiency.

以上に説明したように、各実施の形態の同軸伝送システムでは、複数の周波数帯域を使用し、端末で使用周波数帯の伝送路状態を保持し、送信権管理装置が端末からの送信要求に対して、複数の周波数帯域で送信権を端末に与え、端末が保持している送信先端末との間の周波数帯域毎の伝送路情報から使用する周波数帯域を決定することにより、データ通信を行う端末間で伝送効率の高い周波数帯域を選択してデータ通信を行うことが可能となり、テレビ会議やＩＰ電話等のリアルタイム性が要求される場合に伝送効率のよい通信が可能となる。 As described above, in the coaxial transmission system of each embodiment, a plurality of frequency bands are used, the terminal maintains the transmission path state of the used frequency band, and the transmission right management device responds to a transmission request from the terminal. A terminal that performs data communication by giving a terminal a transmission right in a plurality of frequency bands and determining a frequency band to be used from transmission path information for each frequency band with a destination terminal held by the terminal It is possible to perform data communication by selecting a frequency band with high transmission efficiency between them, and communication with good transmission efficiency is possible when real-time performance is required such as a video conference or IP phone.

なお、各実施の形態では、伝送路状態を伝送速度として伝送効率の高い周波数帯域の伝送条件を選択したが、伝送路状態を伝送誤り率などとして信頼性の高い周波数帯域を選択させるようにしてもよい。伝送誤り率を伝送路状態として判断すると、信頼性の高い通信を実現できる。 In each embodiment, the transmission condition in the frequency band with high transmission efficiency is selected with the transmission line state as the transmission speed, but the reliable frequency band is selected with the transmission line state as the transmission error rate or the like. Also good. If the transmission error rate is determined as the transmission path state, highly reliable communication can be realized.

なお、各実施の形態では、説明を容易にするために、伝送システムを同軸伝送システムとし、伝送路を同軸伝送路としたが、本発明は同軸伝送システム、同軸伝送路に限定されるものではなく、また、伝送路は有線、無線を問わない。 In each embodiment, for ease of explanation, the transmission system is a coaxial transmission system and the transmission path is a coaxial transmission path. However, the present invention is not limited to the coaxial transmission system and the coaxial transmission path. In addition, the transmission path may be wired or wireless.

なお、本発明のプログラムは、上述した本発明の伝送システムの端末の、伝送路状態検査部および伝送条件決定手段の機能をコンピュータにより実行させるためのプログラムであって、コンピュータと協働して動作するプログラムである。 The program of the present invention is a program for causing a computer to execute the functions of the transmission path state inspection unit and the transmission condition determining means of the terminal of the transmission system of the present invention described above, and operates in cooperation with the computer. It is a program to do.

また、本発明の記録媒体は、上述した本発明の伝送システムの端末の、伝送路状態検査部および伝送条件決定手段の機能をコンピュータにより実行させるためのプログラムを記録した記録媒体であり、コンピュータにより読み取り可能かつ、読み取られた前記プログラムが前記コンピュータと協働して利用される記録媒体である。 The recording medium of the present invention, the terminal of the transfer system of the present invention described above, a recording medium recording a program for causing a computer to execute the functions of the channel state checking unit and the transmission condition determining means, a computer It is a recording medium that is readable and used in cooperation with the computer.

また、本発明のプログラムの一利用形態は、コンピュータにより読み取り可能な記録媒体に記録され、コンピュータと協働して動作する態様であっても良い。 Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

また、記録媒体としては、ＲＯＭ等が含まれる。 Further, the recording medium includes a ROM and the like.

また、上述した本発明のコンピュータは、ＣＰＵ等の純然たるハードウェアに限らず、ファームウェアや、ＯＳ、更に周辺機器を含むものであっても良い。 The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

なお、以上説明した様に、本発明の構成は、ソフトウェア的に実現しても良いし、ハードウェア的に実現しても良い。 As described above, the configuration of the present invention may be realized by software or hardware.

伝送路の使用周波数帯域の情報を保持し、その情報により伝送路の送信権の割当処理を行うことで、使用環境に応じた効率的な通信環境を提供することによって、高画質な画像等の高品質、大容量を効率的に伝送することが不可欠な用途にも適応できる。 By holding information on the used frequency band of the transmission path and performing transmission right assignment processing on the transmission path based on the information, by providing an efficient communication environment according to the usage environment, high-quality images, etc. It can also be used in applications where it is essential to efficiently transmit high quality and large capacity.

本発明の特徴を説明するための、伝送システムの概要ブロック図Outline block diagram of transmission system for explaining features of the present invention 本発明の実施の形態１の同軸伝送システムの構成ブロック図Configuration block diagram of coaxial transmission system according to Embodiment 1 of the present invention 本発明の実施の形態１のタイムフレームを示す図The figure which shows the time frame of Embodiment 1 of this invention. 本発明の実施の形態１の送信要求情報の構成を示す図The figure which shows the structure of the transmission request information of Embodiment 1 of this invention. 本発明の実施の形態１の割当情報の構成を示す図The figure which shows the structure of the allocation information of Embodiment 1 of this invention. 本発明の実施の形態１の使用周波数帯域を示す図The figure which shows the use frequency band of Embodiment 1 of this invention 本発明の実施の形態２の同軸伝送システムの構成ブロック図Configuration block diagram of coaxial transmission system according to Embodiment 2 of the present invention 本発明の実施の形態２の情報伝送フレームを示す図The figure which shows the information transmission frame of Embodiment 2 of this invention 従来例の同軸伝送システムの構成ブロック図Configuration block diagram of a conventional coaxial transmission system 従来の伝送システムのタイムフレームを示す図The figure which shows the time frame of the conventional transmission system 従来の伝送システムの送信要求情報の構成を示す図The figure which shows the structure of the transmission request information of the conventional transmission system 従来の伝送システムの割当情報の構成を示す図The figure which shows the structure of the allocation information of the conventional transmission system

Explanation of symbols

１１１〜１１ｎ、７１１〜７１ｎ端末
１２、７２送信権管理装置
１３、７３同軸伝送路
１４１、１５１、７４１、７５１受信部
１４２、１５２、７４２、７５２送信部
１４３伝送路状態検査部
１４４伝送路状態検査制御部
１４５伝送路状態保持部
１４６、７４３送信要求生成部
１４７、２４７、７４４送受信伝送制御部
１４８周波数帯切替部
１４９割当時間取得部
１５３、７５３送信権割当処理部
１５４、７５４送信権情報生成部
１６０伝送条件決定部
２１伝送路検査期間
２２、８１送信要求期間
２３、８２送信権通知期間
２４、８３情報伝送期間
２５端末１１１と端末１１２間の情報伝送期間
３１、４１、９１、１０１送信先端末情報
３２、４２、９２、１０２送信元端末情報
４３、１０３送信期間情報
５１送信周波数情報生成部
５２受信周波数情報取得部
６１使用周波数情報
６２伝送情報
８４端末７１１と端末７１２間の情報伝送期間 111-11n, 711-71n Terminal 12, 72 Transmission right management device 13, 73 Coaxial transmission path 141, 151, 741, 751 Receiving part 142, 152, 742, 752 Transmission part 143 Transmission path state inspection part 144 Transmission path state inspection Control unit 145 Transmission path state holding unit 146, 743 Transmission request generation unit 147, 247, 744 Transmission / reception transmission control unit 148 Frequency band switching unit 149 Allocation time acquisition unit 153, 753 Transmission right allocation processing unit 154, 754 Transmission right information generation unit 160 Transmission condition determination unit 21 Transmission path inspection period 22, 81 Transmission request period 23, 82 Transmission right notification period 24, 83 Information transmission period 25 Information transmission period 31, 41, 91, 101 between terminal 111 and terminal 112 Information 32, 42, 92, 102 Source terminal information 43, 103 Transmission period information 5 DESCRIPTION OF SYMBOLS 1 Transmission frequency information generation part 52 Reception frequency information acquisition part 61 Use frequency information 62 Transmission information 84 Information transmission period between the terminal 711 and the terminal 712

Claims

Multiple terminals that send and receive signals;
A transmission right management device for managing and assigning a time zone for transmitting and receiving signals between the terminals;
In a transmission system comprising a transmission path for communicating each of the plurality of terminals and the transmission right management device with each other,
Each of the plurality of terminals is
A transmission line state inspection unit that inspects the transmission line state with other terminals for each transmission specification for each frequency band that is one of the transmission specifications ;
A transmission line state holding unit for holding the inspection result of the transmission line state as transmission line information;
Based on the transmission path information held in the transmission path state holding unit, it possesses in communicating with other terminals, and a transmission condition determining means for determining the predetermined transmission condition is a combination of a plurality of the transmission specifications ,
A transmission system for transmitting using each transmission specification of the determined transmission conditions .

Each of the plurality of terminals further includes:
Transmission condition transmitting means for transmitting information on the determined transmission condition to a destination terminal;
Transmission condition receiving means for receiving transmission condition information transmitted from a transmission source terminal;
Transmission source terminal, the information of the transmission condition transmitted before transmitting the transmission data to the transmission destination terminal, and transmits the transmission data to the transmission destination terminal using the transmission conditions, in claim 1 The described transmission system.

Wherein the other transmission specifications, includes a plurality of transmission method according to the combination of different modulation schemes and transmission bandwidth, transmission system according to claim 1.

The transmission path state is a transmission speed,
The transmission system according to claim 1 , wherein the transmission condition to be determined is a condition in which a transmission speed is fastest among the inspected transmission line states.

The transmission system according to claim 1 , wherein the transmission path state inspection unit repeatedly inspects a transmission path state with each other terminal at regular intervals.

The transmission system according to claim 1, wherein the transmission path includes a plurality of coaxial cables and a distributor that branches a signal of one coaxial cable into signals of other coaxial cables.

Multiple terminals that send and receive signals;
A transmission right management device for managing and assigning a time zone for transmitting and receiving signals between the terminals;
In a transmission method of a transmission system comprising a transmission path for communicating each of the plurality of terminals and the transmission right management device with each other,
Each of the plurality of terminals is
Inspecting the transmission path state with other terminals for other transmission specifications for each frequency band that is one of the transmission specifications, and holding the inspection results ;
Determining a predetermined transmission condition that is a combination of a plurality of the transmission specifications when communicating with another terminal based on the inspection result ;
Transmitting using each transmission specification of the determined transmission conditions .

Each of a plurality of terminals of the transmission system according to claim 1;
The transmission line state inspection unit that inspects the transmission line state with other terminals for other transmission specifications for each frequency band ,
And a program for, based on the prior Symbol transmission path information, the transmission condition determining means for determining a transmission condition in communicating with other terminals, causes a computer to function as.

A recording medium on which the program according to claim 8 is recorded , the recording medium being usable by a computer.

A transmission path state inspection unit that inspects transmission path states between a plurality of other terminals for other transmission specifications for each frequency band that is one of the transmission specifications ;
A transmission line state holding unit for holding the inspection result of the transmission line state as transmission line information;
Transmission condition determining means for determining a predetermined transmission condition that is a combination of a plurality of the transmission specifications when communicating with other terminals based on the transmission path information held in the transmission path state holding unit ,
A terminal for time division multiplex communication that transmits using each transmission specification of the determined transmission conditions .