JPH03162147A - Time division multi-direction multiplex transmission system - Google Patents

Abstract

PURPOSE:To effectively utilize all communication channels by using each communication channel of a time division multi-direction multiplex communication circuit as a signal channel or a data channel, and setting arbitrarily a channel constitution allocated in accordance with each communication terminal. CONSTITUTION:A time division multiplex frame is constituted of a control channel containing a communication terminal number, control information including a communication channel number corresponding to each communication terminal NT1-NTn(NT), and transmission information and channel discriminating information for showing whether this transmission information is a signal channel or a data channel. A channel setting means 11 of a communication controller 10 sets a communication channel allocated to the time division multiplex frame to the control channel in accordance with each communication terminal NT and informs it to each communication terminal. The communication controller 10 and transmitting/receiving means 12, 311-31n of each communication terminal NT execute a multiplexing separation and executes transmission and reception, based on the contents of this control channel. In such a way, all communication channels can be utilized effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a time-division multidirectional multiplex transmission system for digital communication. In particular, it relates to a channel allocation system for time division multidirectional multiplex communication lines.

〔overview〕

The present invention uses each communication channel of a time division multiplex communication line as a signal channel or a data channel in a time division multiplex transmission system, and arbitrarily sets a channel configuration to be assigned to each communication terminal. As a result, all communication channels can be used effectively without signal channels or data channels being held invalid, and more communication terminals can communicate simultaneously using a limited number of communication channels.

[Conventional technology]

FIG. 4 is a diagram showing the structure of a time division multiplex frame in a conventional time division multiplex transmission system. FIG. 5 is a diagram showing the structure of a time division multiplex frame in another conventional time division multiplex transmission system.

Conventionally, in the time division multidirectional multiplex transmission system, each communication channel was composed of a signal channel (D) and a data channel (B) as shown in FIGS. 4 and 5 as a channel allocation system. Therefore, when one communication terminal uses a plurality of data channels, such as an ISDN terminal, the channels are allocated as follows. As shown in FIG. 4, when each communication channel is composed of 28+D, when a communication terminal communicates, <28+D communication channels, which are related to the number of used data channels, are allocated.

On the other hand, when each communication channel is composed of B+D as shown in Figure 5, when a communication terminal uses one data channel, it allocates one communication channel, and when it uses two data channels, it allocates one communication channel. assigned two communication channels.

[Problem that the invention seeks to solve]

However, in such a conventional time division multiplex transmission system, each communication channel consists of a signal channel (D) and a data channel (B), so each communication If the channels are configured with 28+D,
When one communication terminal uses multiple data channels, such as an ISDN terminal, the data channels that the communication terminal does not use are held invalid, and each communication channel is configured as B+D as shown in FIG. If the communication terminal uses only a signal channel, the data channel is held invalid, and when the communication terminal uses two data channels, one signal channel is held invalid. Therefore, in either case, there is a drawback that the communication channel usage efficiency is reduced.

The present invention solves the above-mentioned drawbacks, and eliminates the need for signal or data channels to be held invalid. All communication channels can be used effectively, and more communication terminals can be connected to a limited number of communication channels. The purpose of this invention is to provide a time division multidirectional multiplex transmission system that allows simultaneous communication.

[Means for solving problems]

The present invention provides a time-division multidirectional multiplex transmission system comprising a communication control device and a plurality of communication terminals that communicate with the communication control device via time-division multiplex frames, in which the time-division multiplex frames are , a control channel including a communication terminal number, control information, and communication channel number corresponding to each of the communication terminals, and a plurality of communication channels including transmission information and channel identification information indicating whether this information is a signal channel or a data channel. The communication control device includes channel setting means for setting, as the control channel, a communication channel to be assigned to the time division multiplexed frame in correspondence with each of the communication terminals, and the communication control device and each of the communication terminals is characterized in that it includes a transmitting/receiving means that performs demultiplexing and transmitting/receiving based on the content of each of the control channels.

[Effect]

A time division multiplex frame consists of a control channel including a communication terminal number, control information, and communication channel number corresponding to each communication terminal, and transmission information and channel identification information indicating whether this transmission information is a signal channel or a data channel. be done. Generally, the channel setting means of the control device sets a communication channel to be assigned to a time division multiplex frame in correspondence with each communication terminal as a control channel, and notifies each communication terminal. The communication control device and the transmitting/receiving means of each communication terminal perform demultiplexing and transmitting/receiving based on the contents of this control channel. With the above operation, no signal channel or data channel is held invalid, all communication channels can be used effectively, and many communication terminals can communicate simultaneously using limited communication channels.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a time division multidirectional multiplex communication system according to an embodiment of the present invention. In FIG. 1, the time division multiplexing transmission system is a multiplex transmission system in which communication is performed between a communication control device 10 and a communication control device IO using time division multiplexing frames via a time division multidirectional multiplexing communication line 20. communication terminal NTI~N
and Tn.

Here, the feature of the present invention is that the above-mentioned time division multiplex frame includes a control channel including a communication terminal number, control information, and communication channel number corresponding to each communication terminal NT;
It is composed of transmission information and a plurality of communication channels including channel identification information indicating whether this information is a signal channel or a data channel. The communication control device 10 and each communication terminal N include a channel setting manual 11 for setting a communication channel to be attached to the control channel.
T includes transmitting/receiving means 12, 31 . ~31,,
It is to include.

The operation of the time division multidirectional multiplex transmission system having such a structure will be explained. FIG. 2 is a diagram showing the structure of a time division multiplex frame in the time division multiplex transmission system of the present invention. Third
The figure is a diagram showing the allocation of signal channels and data channels to time division multiplex frames in the time division multiplex transmission system of the present invention. The table shows channel allocation to time division multiplex frames in the time division multiplex transmission system of the present invention.

(Hereinafter, the margin of this page) In Fig. 2, CCH is a control channel used for channel allocation control between the communication control device 10 and the communication terminals NTI to NTn, and the communication terminal number NTN○, the control information CTL, and the communication channel. It is composed of the number CHN○.

In addition, the communication channel number CHI-CHn is channel identification information CH that identifies a signal channel and a data channel.
It is composed of an ID and transmission information INF.

Next, channel allocation will be explained with reference to FIG. 3 and a table. The table is. , channel identification information CHID corresponding to the communication channel number CHN○, and the communication terminal number NT No. using the communication channel. In this embodiment, signal channel D is assigned preferentially starting from communication channel number CHI, and data channel B is assigned preferentially starting from communication channel number CHn.

First, a procedure for allocating a signal channel D and two data channels B and (2B+D) to the communication terminal NTI will be explained. The communication control device 10 has a control channel CCH.
is used to instruct the communication terminal NTI to allocate channels. For the first control order, the communication terminal number NT N
○ is "1", control information CTL is "signal channel allocation instruction", and communication channel number CHN○ is "l".

In the second control order, the communication terminal number NT N○ is also set to "1", the control information CTL is set to "data channel allocation instruction", and the communication channel number CHN○ is set to rnJ. In the third control order, the communication terminal number NTN○ and the control information CTL are the same as the second time, and the communication channel number CH N○ is set to rn-IJ. As a result, the communication channel numbers CHI and CHnSCH are sent to the communication terminal NTI.
(n-1) 28+D channel allocation is completed.

Next, a procedure for allocating a signal channel D and one data channel B and B+D to the communication terminal NT2 will be explained.

Similarly to the channel allocation for the communication terminal NTI, the communication control device 10 uses the control channel CCH to issue a channel allocation instruction to the communication terminal NT2. For the first control order, the communication terminal number NT NO is "2" and the control information CTL
is a "signal channel allocation instruction", and the communication channel number CHN○ is set to "2" because the communication channel number CHI is allocated to the communication terminal NT1. In the second control order, the communication terminal number NTN○ is also set to "2", the control information CTL is set to "data channel allocation instruction", and the communication channel number CH N○ is set to the communication channel numbers CHn, CH.
Since (n-1) is assigned to the communication terminal NTI, it is assumed to be rn-2J. This completes the B+D channel allocation of communication channel numbers CH2 and CH(n-2) for the communication terminal NT2.

After that, when the communication of the communication terminal NTI ends and the communication channel numbers CHI, CHn, CH (n-1) become unallocated, the allocation priority of the signal channel D will be the communication channel numbers CHI, CH3, CH4, The allocation priority of data channel B is communication channel number CHn.
, CH (n-1), CH (n-3), CH (n
-4).

That is, no matter what combination of signal channel D and data channel B is used by one communication terminal, signal channel D or data channel B will not be held invalid. Furthermore, no matter what ratio the signal channel D and data channel B are used as a whole, it is possible to effectively utilize all communication channels.

In the above embodiment, 2B+D and B+D have been described as channel structures to be allocated to communication terminals, but it is also possible to allocate only signal channel D, and the channel structure is not limited to the above description. Moreover, the effect can be obtained even if the priority order of allocation between the signal channel D and the data channel B is arbitrary, and the present invention is not limited to the above explanation.

〔Effect of the invention〕

As explained above, the present invention prevents signal channels or data channels from being held invalid, allows effective use of all communication channels, and allows more communication terminals to communicate simultaneously using limited communication channels. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a time division multidirectional multiplex transmission system according to an embodiment of the present invention. FIG. 2 is a diagram showing the structure of a time division multiplex frame in the time division multiplex transmission system of the present invention. FIG. 3 is a diagram showing the allocation of signal channels and data channels to time division multiplex frames in the time division multiplex transmission system of the present invention. FIG. 4 is a diagram showing the structure of a time division multiplex frame in a conventional time division multiplex transmission system. FIG. 5 is a diagram showing the structure of a time division multiplex frame in another conventional time division multiplex transmission system. lO...Communication control device, 1■...Channel setting means, i2, 31. ~31,...transmitting/receiving means, 20...
Time division multidirectional multiplex communication line, CCH...control channel, CHI, CH2, CHn...communication channel number, NT N○...communication terminal number, CTL...control information, CH NO... Communication channel number, CHID...
・Channel identification information, INF...transmission information, D...
Signal channel, B...Data channel, NTI~NT
n...Communication terminal. 1st embodiment engineering drawing implementation example Time division multiplex frame Figure 2 Example channel allocation Figure 3

Claims (1)

[Claims] 1. In a time division multidirectional multiplex transmission system comprising a communication control device and a plurality of communication terminals that communicate with the communication control device via time division multiplex frames, The division multiplex frame includes a control channel including a communication terminal number, control information, and a communication channel number corresponding to each communication terminal, and a plurality of channels including transmission information and channel identification information indicating whether the transmission information is a signal channel or a data channel. and a communication channel, and the communication control device includes channel setting means for setting a communication channel to be assigned to the time division multiplex frame in correspondence with each of the communication terminals as the control channel, and the communication control device and A time-division multidirectional multiplex transmission system characterized in that each of the communication terminals includes a transmitting/receiving means for demultiplexing and transmitting/receiving based on the content of the control channel.