JPH10145322A - Time division multiplexer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the time division multiplexer in which partial use of users for channel frequency bands is blocked. SOLUTION: Time zone depending band management information SA for each terminal group is stored in a database 15, via a band management information setting reception section 14. A connection request reception section 11 receives communication request signals Sa, Sb, Sc, Sd of terminal equipments a, b, c, d. The connection request reception section 11 sends terminal equipment identification information S11 to a band assignment section 12. After the band assignment section 12 retrieves a terminal group, to which the terminal equipment sending the communication request signal belongs from the database 15, the band assignment section 12 discriminates if there is any band to connect to the terminal equipment outputting the communication request signal among the assigned transmission band with respect to a current time zone or not. When a connection enable band is available, the band assignment section 12 reserves a band required for communication among the bands and provides an output of a connection request signal S12 to a connection control section 13. Based on the connection request signal S12, a terminal equipment sending the communication request signal, and a relay line L are connected to attain the communication with other time division multiplexers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division multiplexing apparatus for performing communication by a time-division multiplexing method via a line having a predetermined transmission band.

[0002]

2. Description of the Related Art Demand Assignment (hereinafter referred to as DA) is one of the methods of connecting a trunk line of a time division multiplexer.
There is a method). The DA system is a system in which a part of the transmission band of a trunk line is defined as a demand band, and a connectionable band is secured from the demand band for each communication request from a terminal. This DA system is a so-called “early-winning system” in which connection of a terminal that has requested communication first has priority. Therefore, when the communication of the terminal connected using the demand band is completed, the band is allocated to the communication request of the other waiting terminal. As described above, the DA system allows a specific band defined as a demand band to be shared by a plurality of users.

[0003]

However, the conventional time-division multiplexing apparatus using the DA system has the following problems. In the conventional time-division multiplexing apparatus using the DA system, the demand band can be allocated quickly and only the winning system can be allocated. Therefore, the demand band users are biased, and the demand band needs to be used. There was a problem that those who wished to use the service might not be able to use it.

[0004]

According to the present invention, there is provided a time-division multiplexing apparatus for communicating with a plurality of terminals via a line having a predetermined transmission band by a time-division multiplexing method. The following means are provided. That is, the terminal belongs to any of a plurality of terminal groups having a transmission capacity equal to or less than the predetermined transmission band, and belonging data indicating which terminal group of the terminal groups each terminal belongs to. And time zone group-allocated band data representing the transmission bandwidth in the line allocated to each terminal group by changing the available bandwidth for each predetermined time interval at a predetermined interval. A data file is provided to hold the data. And a connection request receiving unit that receives each communication request signal generated by the plurality of terminals, identifies each terminal and outputs terminal identification information, and, based on the terminal identification information, determines the plurality of terminals from the belonging data. Of the terminals which output the communication request signal belong to, and based on the time zone group vs. allocated band data, the terminal group is allocated to a time zone including the time at which the terminal identification information comes in. In the transmission band, it is determined whether there is a band to which the terminal that has output the communication request signal can be connected, and if there is a connectable band, a band necessary for communication is secured from the connectable band. A band allocating unit that outputs a connection request signal, and a connection control unit that connects the terminal and the line that output the communication request signal according to the reserved band based on the connection request signal. It is provided.

According to the present invention, since the time division multiplexing device is configured as described above, the connection request receiving unit receives a communication request signal from each terminal. Then, the connection request receiving unit identifies each terminal and sends terminal identification information to the band allocating unit. The band allocating unit searches a data file for a terminal group to which the terminal that has issued the communication request signal belongs, and has a band to which the terminal that has output the communication request signal can be connected in a transmission band allocated in a current time zone. It is determined whether or not. If there is a transmission band that can be connected, the band allocating unit secures a band required for communication from the band, and outputs a connection request signal to the connection control unit. The connection control unit connects the terminal that has issued the communication request signal to a line based on the connection request signal, and enables communication with another time division multiplexing device. Therefore, the above problem can be solved.

[0006]

2 (a) and 2 (b) are functional conceptual diagrams of a time division multiplexer according to the present invention. In these figures, a plurality of terminals a, b, c, d, e, f, g, and g using a demand band in a trunk line L having a predetermined transmission band are illustrated.
h, i, j are, for example, four terminal groups # 1, # 2, #
3, # 4. That is, terminals a, b, and c belong to terminal group # 1, and terminals d and e belong to terminal group #.
2 Terminals f, g, h belong to terminal group # 3, and terminals i, j belong to terminal group # 4. Further, FIG. 2A shows the state of demand band allocation in the time zone T1. That is, in the time zone T1, the demand band Da is allocated to the terminal group # 1 by the time division multiplexer 1. The demand band Db is allocated to the terminal group # 2 by the time division multiplexer 1. The demand band Dc is allocated to the terminal group # 3 by the time division multiplexer 2. The transmission band Dd is assigned to the terminal group # 4 by the time division multiplexer 2.

In this time zone T1, terminal group # 1
Are terminal groups # 3, # 3 using the demand band Da.
4 becomes possible. Further, the terminal group # 2 can communicate with the terminal groups # 3 and # 4 using the demand band Db. Further, the terminal group # 3 can communicate with the terminal groups # 1 and # 2 using the demand band Dc. The terminal group # 4 can communicate with the terminal groups # 1 and # 2 using the demand band Dd. FIG. 2B shows the state of the transmission band allocation in the time zone T2. That is, the time zone T
2, the transmission band De is allocated to the terminal group # 1 by the time division multiplexer 1. The transmission band Df is assigned to the terminal group # 2 by the time division multiplexer 1. The transmission band Dg is assigned to the terminal group # 3 by the time division multiplexer 2. The transmission band Dh is allocated to the terminal group # 4 by the time division multiplexer 2. In this time zone T2, the terminal group # 1 can communicate with the terminal groups # 3 and # 4 using the demand band De.
The terminal group # 2 can communicate with the terminal groups # 3 and # 4 using the demand band Df. Furthermore,
The terminal group # 3 can communicate with the terminal groups # 1 and # 2 using the demand band Dg. Also, the terminal group # 4 can communicate with the terminal groups # 1 and # 2 using the demand band Dh. Similarly, time zone T
Also in the time zones after 2, the available bandwidths are changed for each time zone, and demand bands are allocated to the terminal groups # 1, # 2, # 3, and # 4, respectively.

FIG. 1 is a block diagram of a time division multiplexing apparatus showing an embodiment of the present invention, and shows the internal configuration of the time division multiplexing apparatuses 1 and 2 in FIG. The time division multiplexing device 10 includes a connection request receiving unit 11, a band allocating unit 12,
It includes a connection control unit 13, a bandwidth management information setting reception unit 14, and a database 15 as a data file.
The connection request receiving unit 11 receives communication request signals Sa, Sb, Sc, and Sd output from terminals a, b, c, and d, such as a computer terminal and a private branch exchange, and identifies each terminal to determine terminal identification information. It has a function of outputting S11. The output side of the connection request receiving unit 11 is connected to the bandwidth allocating unit 12. The band allocating unit 12 determines the terminal identification information S11
When the communication request signal arrives, the database 15 is searched, and a terminal group to which the terminal that has output the communication request signal belongs, and a time zone including the time when the communication request signal enters from a clock (not shown) (that is, the current time zone) ). The band allocating unit 12 has a function of determining whether or not there is a band to which the terminal that has output the communication request signal can be connected in the demand band allocated to the current time zone. When there is a band to which a terminal can be connected in the allocated demand band, the band allocating unit 12 has a function of securing a band necessary for communication from the band and outputting a connection request signal S12. The output side of the band allocator 12 is connected to the connection controller 13. The terminals a, b, c, and d are also connected to the connection control unit 13. The connection control unit 13 has a function of connecting the terminal that has output the communication request signal and the trunk line L based on the connection request signal S12.

The band management information setting receiving section 14 receives a terminal group (for example, terminal groups # 1, # 2, # 3 in FIG. 2) from the band management information input section A by an operation of an operator.
# 4) It has a function of inputting time-based band management information SA for each time zone. The band management information input unit A is a data input unit such as a keyboard. The output side of the bandwidth management information setting receiving unit 14 is connected to the database 15. The database 15 assigns each terminal to one of a plurality of terminal groups having a transmission capacity equal to or less than a predetermined transmission band based on the time zone-based band management information SA. It has a function of holding belonging data S15a indicating whether the terminal belongs to the terminal group. Further, the database 15 stores a terminal group by time zone versus an allocated bandwidth indicating a demand bandwidth in the trunk line L allocated to each terminal group by changing an available bandwidth for each predetermined time interval of a predetermined interval. It has a function to hold the data S15b. The output side of the database 15 is connected to the bandwidth allocating unit 12. Further, the database 15 has a function of holding band use status data which is data for managing the transmission capacity of the band currently used by the terminal group.

FIG. 3 shows the relation between the terminal and the belonging group managed by the database 15 of FIG. 1 (that is, the belonging data S1).
It is a figure which shows 5a). In this figure, data for associating a terminal with a terminal group number is shown. Therefore, when searching by terminal number (for example, a, b, c,...), The number of the terminal group to which the terminal belongs (for example,
# 1, # 2, # 3,...) Are required. FIG. 4 is a diagram showing band use status data managed by the database 15 of FIG. In this figure, data for managing the transmission capacity of the band currently used by each terminal group is shown. Therefore, the terminal group number (for example, # 1,
# 2, # 3,...), The transmission capacity of the band used by each terminal group is obtained. FIG. 5 is a diagram showing the relationship between the time-slot-based terminal group and the assigned bandwidth (that is, the time-segment-based terminal group vs. the assigned bandwidth data S15b) managed by the database 15 of FIG. In this figure, data for managing the transmission capacity of the band that can be used by the terminal group is shown. Therefore, when searching by terminal group number (for example, # 1, # 2, # 3,...), The transmission capacity of the band that can be used in the current time zone is obtained.

Next, the operation of FIG. 1 will be described. The time-based band management information SA for each terminal group is input to the band management information setting reception unit 14 from the band management information input unit A by the operation of the operator. The time zone-based band management information SA is held in the database 15. The connection request receiving unit 11
Communication request signal S output from terminal devices a, b, c, d
a, Sb, Sc, and Sd are received. Connection request receiving unit 11
Is terminal identification information S representing the terminal that generated the communication request signal.
11 is transmitted to the band allocating unit 12. The band allocating unit 12
Based on the terminal identification information S11, a terminal group to which the terminal that has issued the communication request signal belongs is searched by the belonging data S15a shown in FIG. 3 managed by the database 15, and the terminal to which the terminal that has output the communication request signal belongs is searched. Ask for group and current time zone. Further, the bandwidth allocating unit 12 searches the terminal group by time zone pair allocated bandwidth data S15b shown in FIG. 5 managed by the database 15 and assigns the communication request signal to the transmission bandwidth allocated to the current time zone. It is determined whether or not there is a band to which the terminal that has output is connectable. If there is a band that can be connected, the band allocating unit 1
2 secures a band necessary for communication from the corresponding band, displays the band use status data shown in FIG. 4 as “in use”, and outputs a connection request signal S12 to the connection control unit 13.
On the other hand, if there is no band that can be connected, the communication request signal is output again from the terminal after a predetermined time has elapsed. The connection control unit 13 connects the terminal that has output the communication request signal and the trunk line L based on the connection request signal S12, and enables communication with another time division multiplexing device.

As described above, in the present embodiment, the terminals a, b, c, and d connected to the time-division multiplexing apparatus 10 belong to any of a plurality of terminal groups, and the demand bandwidth is assigned to each of the terminal groups. Is allocated by changing the bandwidth for each time zone, so that a transmission band that can always be used in that time zone is always secured for each terminal group, and the capacity of the demand band is reduced by the connected terminal a. , B, c, d
Can be suppressed below the total bandwidth capacity required by all of them. Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, there are the following modifications. (A) The number of terminals a to d in the embodiment may be any value. (B) The method of assigning the terminals a to d to the terminal group may be any method as long as a terminal group having a transmission capacity equal to or less than the demand band is created.

[0013]

As described above in detail, according to the present invention, a plurality of terminals connected to a time division multiplexer are assigned to a plurality of terminal groups, and the demand band of a line is assigned to each terminal group. Since the bandwidth is changed and assigned for each time zone, it is possible to secure communication of a constant capacity for each terminal group without allocating a fixed demand bandwidth of the line. Further, the transmission capacity of the line can be suppressed to be equal to or less than the total bandwidth capacity of all the terminals connected to the time division multiplexer.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a time division multiplexing device according to an embodiment of the present invention.

FIG. 2 is a functional conceptual diagram of the time division multiplexing device of the present invention.

FIG. 3 is a diagram illustrating a relationship between a terminal and a belonging group.

FIG. 4 is a diagram showing band usage status data.

FIG. 5 is a diagram illustrating a relationship between a terminal group by time zone and an allocated band.

[Explanation of symbols]

1, 2, 10 Time-division multiplexer 11 Connection request receiving unit 12 Bandwidth allocating unit 13 Connection control unit 15 Database (data file) a, b, c, d, e, f, g, h, i, j Terminal Da , Db, Dc, Dd, De, Df, Dg, Dh Demand band T1, T2 Time zone L Relay line (line) # 1, # 2, # 3, # 4 Terminal group

Claims (1)

[Claims] 1. A time-division multiplexing apparatus for performing communication from a plurality of terminals by a time-division multiplexing method via a line having a predetermined transmission band, wherein each terminal has a transmission capacity equal to or less than the predetermined transmission band. Attribute data indicating which terminal group each terminal belongs to, and bandwidth available for each predetermined time interval at a predetermined interval. A data file that defines and retains time-based group-to-allocated band data representing the transmission band in the line allocated to each terminal group by changing the communication request signals generated by the plurality of terminals. Accept
A connection request receiving unit that identifies each of the terminals and outputs terminal identification information, and a terminal group to which a terminal that has output the communication request signal among the plurality of terminals from the belonging data belongs based on the terminal identification information. And the terminal that has output the communication request signal can be connected to the transmission band allocated to the time period including the time at which the terminal identification information has entered based on the group-by-time group-allocated band data. It is determined whether or not there is a band, and if there is a connectable band, a band allocating unit that secures a band necessary for communication from the connectable band and outputs a connection request signal, and the connection request signal A time division multiplexing apparatus, comprising: a connection control unit that connects the terminal that outputs the communication request signal in accordance with the secured band and the line.