KR100251775B1 - Dynamical channel allocation method and apparatus in a digital exghange system - Google Patents

Abstract

PURPOSE: A dynamic channel allocation method and apparatus of a digital switching system are provided to increase a switching capacity of a switching system and thus provide a service to more subscribers by reducing the number of ineffective channels of a highway by selecting channels as many as to be received by each card from highway channels and allocating the channels as many as the corresponding number. CONSTITUTION: Highways(HW1¯HW8) provided in a switching system are connected to cards(C11¯C1n). Each channel of the highways(HW1¯HW8) is distributed to be allocated to the plurality of cards(C11¯C1n) according to an accommodation capacity of the cards. For example, on the assumption that the first card(C11) supports 4 ports, the second card(C12) supports 8 ports, the third card(C13) supports 12 ports and the fourth card(C14) supports 16 ports, each channel of the first highway(HW1) can be allocated to the first card(C11), the third card(C13), the fourth card(C14). That is, the first to the fourth channel of the first highway(HW1) can be allocated to the first card(C11), the fifth channel to the 16th channel can be allocated to the second(C12), the 17th channel to 32nd channel can be allocated to the third card(C13), and such channel allocations have an effect of removing generation of an ineffective channel. The channel allocation is possible because each card includes a time switch, by which the required number of channels of the highway are connected to each CODEC for voice transmission and reception.

Description

Dynamic Channel Allocation Method and Device in Digital Switching System {DYNAMICAL CHANNEL ALLOCATION METHOD AND APPARATUS IN A DIGITAL EXGHANGE SYSTEM}

The present invention relates to a channel allocation method and apparatus of a digital switching system, and more particularly, to a method and apparatus for dynamically allocating all channels of a highway without being invalidated.

In a Private Automatic Branch eXchange (PABX) or Digital Keyphone System (hereinafter referred to as the "digital exchange system"), a highway is a 24 or 32 channel connected in time. Channel refers to data (usually 8 bits) in which an analog signal of one subscriber is converted to digital. The inside of such a digital switching system is composed of a plurality of slots, each of which is equipped with cards (typically trunk interface cards, subscriber line interface cards, etc.) that perform predetermined functions. It will perform the function of the exchange system. At this time, each card has a structure in which one or 0.5 highways are usually assigned, that is, a structure in which one highway is assigned to two or three cards. This is because each card in a digital switching system is typically designed to support ports such as 4, 6, 8, 12, and 16. Therefore, assuming that the time switch of a digital switching system accommodates 256 channels, one highway is usually composed of 32 channels, so eight highways will be provided in this switching system.

1A and 1B are diagrams illustrating a highway structure of a digital switching system according to the prior art, and FIG. 1A is a diagram in which a highway is allocated to every two cards, and FIG. 1B is a highway every three cards. Is a diagram showing a structure to which is assigned.

Referring to FIG. 1A, the digital switching system includes n cards CA1 to CAn, and each of these cards is assigned a highway by a time switch 20 controlled by the controller 10. That is, the first highway HW1 is assigned to the cards CA1 to CA2, the second highway HW2 is assigned to the cards CA3 to CA4, the third highway HW3 is assigned to the cards CA5 to CA6, and the eighth HW8 to the cards CAn. do.

Referring to FIG. 1B, the digital switching system includes n cards CB1 to CBn, and each of these cards is assigned a highway by a time switch 20 controlled by the controller 10. That is, the first highway HW1 is assigned to the cards CB1 to CB3, the second highway HW2 is assigned to the cards CB4 to CB6, and the eighth highway HW8 is assigned to the card CBn.

According to the prior art highway structure as described above, one highway (32 channels) is generally allocated to two or three slots. However, when the highway is allocated in this way, all channels of the highway cannot be used, that is, a disadvantage of generating an invalid channel. For example, in FIG. 1A, when the first highway HW1 is assigned to the 4-port card CA1 and the 8-port card CA2, 20 channels (32 channels-4 channels-8 channels) are invalidated, and 12 ports card CA3 and When the second highway HW2 is assigned to the 16-port card CA4, four channels (32 channels-12 channels-16 channels) will be invalidated. As another example, in FIG. 1B, when the first highway HW1 is assigned to the 4-port card C [A] B 1 and the 8-port card C [A] B 2 and the 12-port card C [A] B 3, Channels (32 channels-4 channels-8 channels-12 channels) will be invalidated.

[Also] Thus there is a problem in that the overall switching capacity of the switching system is significantly reduced when the channel is invalid increased [as] for each highway. For example, although the capacity of a time switch in a switching system is 256 × 256, in practice, the capacity of a switch provided in the switching system is usually 150 to 200. This reduction in switching capacity in the exchange system means that the number of subscribers that can be serviced is reduced.

It is therefore an object of the present invention to provide a dynamic channel allocation method and apparatus for serving more subscribers in an exchange system.

It is another object of the present invention to provide a dynamic channel allocation method and apparatus for reducing the number of invalid channels generated in an exchange system.

Another object of the present invention is to provide a method and apparatus for allocating a dynamic channel to increase the switching capacity of an exchange system.

The present invention for achieving these objectives is a channel assignment that connects all the highways provided in the exchange system to all of the plurality of cards and assigns each channel of the highway to each of the plurality of cards as its capacity. We propose a method and apparatus .

1A and 1B show a highway structure of an exchange system according to the prior art.

2 shows a highway structure of an exchange system according to the invention.

FIG. 3 is a diagram showing the structure of dynamic channel allocation provided in each of the cards shown in FIG. 2; FIG.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

2 is a diagram illustrating a highway structure of an exchange system for a channel allocation method according to the present invention.

2, it can be seen that all the highways HW1 to HW8 provided in the exchange system are connected to all the cards C11 to C1n. In this case each channel of the highways HW1~HW8 is allocated to be distributed so as to correspond to the capacity to a plurality of card C11~C1n respectively. For example, suppose that the first card C11 supports four ports, the second card C12 supports eight ports, the third card C13 supports twelve ports, and the fourth card C14 supports sixteen ports. According to the present invention, each channel of the first highway HW1 may be assigned to the first card C11, the third card C13, and the fourth card C14 card. That is, 1 to 4 channels of the first highway HW1 are allocated to the first card C11, 5 to 16 channels are allocated to the second card C12, and 17 to 32 channels are assigned to the third card C13. This channel assignment has the effect of eliminating the occurrence of the invalid channel.

The above channel assignment is possible by additionally equipped with a time switch 30 [in] as shown in FIG. 3 inside each of the cards C11 to C1n, and required by the time switch 30. is due to to be connected to: (Coder and Decoder cODEC) 41~44 highway [a] as the channels are each codec for voice transmission and reception. In this case, it should be noted that the time switch 30 is different from the time switch 20 shown in FIGS. 1A and 1B. That is, since the time switch 20 shown in Figs. 1A and 1B is one large capacity time switch provided in the entire exchange system, the time switch 30 is a small capacity time switch provided in each of the cards C11 to C1n.

Fig number of highway connected at 3 between the time switch 30 and a codec 41-44 is determined by the number of one of the codec [amount]. That is, the time switch 30 allows one highway channel to be connected when the codec is 32 or less, and two highway channels are connected when the codec is between 32 and 64.

For example, assuming that one card has four codecs, four channels are conventionally allocated on one highway. However, according to the present invention, four channels among eight highways are allocated to the four codecs. That is, the control unit of the switching system arbitrarily sets a channel that is not currently used and gives information about the time switch of each card, and the time switch of each card uses the information to create a highway and transmit it to each codec. . In FIG. 3, codec 41 is assigned to the third channel of the first highway, codec 42 is assigned to the tenth channel of the second highway, codec 43 is assigned to the fifteenth channel of the third highway, and codec 44 is assigned to the 29th channel of the fourth highway. If so, Timeswitch 30 creates a new internal highway on this channel. That is, a specific channel of a specific highway is randomly assigned to a specific codec. Therefore, almost all channels are available for use.

As described above, the present invention selects from the channels of all highways the number of channels that can be accommodated in each card and allocates the corresponding number. Accordingly, since the number of invalid channels of the highway can be reduced, the switching capacity of the switching system can be increased, and as a result, it is possible to service more subscribers.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

Claims (2)

A digital switching system including a codec for transmitting / receiving a voice that performs a predetermined unique function, a built-in time switch for allocating channels, and a plurality of cards to which all highways provided by the system are connected. In the channel allocation method of, [Connecting all highways provided in the exchange system to all of the plurality of cards and distributing each channel of the highway to each of the plurality of cards as much as their capacity. Receiving information about channels not used by the time switch in the switching system; Assigning, by the time switch, specific channels from different highways as many as the number of channels that can be accommodated by codecs provided therein; And connecting the specific channels of the assigned specific highway to the respective codecs by the time switch . In the channel assignment apparatus of the digital switching system including a plurality of cards to which all highways provided by the system are connected Codecs provided for transmitting and receiving voice inside the respective cards, Built into each of the cards, it is provided with information about channels that are not in use in the exchange system, and by using the provided information different channels can be assigned to specific channels as many as the number of channels the codecs can accommodate. And a time switch for allocating a specific channel of the assigned specific highway to the respective codecs.

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