JP2889936B2 - Communication class setting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ISDN that integrally handles various calls defined by communication quality such as a communication speed, a drop rate, a delay time, and a call loss rate required for a communication network. (Integrated service digital communication network), etc., in a call admission judgment system for judging and controlling at the time of a call connection request whether intra-network transfer satisfying the communication quality required by each call can be performed. The amount of transmission lines required to realize and guarantee the communication quality required by the call from the expected call volume for each class
A communication class setting method for calculating various communication resource amounts such as a communication path, and determining whether to accept a call that realizes and guarantees communication quality by securing the communication resource amount for each class in advance,
Particularly, it relates to a method of classifying calls.

[Conventional technology]

As a conventional technique, in a conventional method of determining and controlling call acceptance of a communication system that handles calls having various communication qualities such as ISDN, a class corresponding to all communication quality calls handled by the communication system is provided. Based on the past statistical information and the inference function for each class, the assumed traffic volume is calculated for each time zone, and the maximum number of simultaneous connections required to realize and guarantee the quality required by the call from the traffic volume assumed for each class and Calculate the amount of communication resources, logically secure the required amount of communication resources, and make the admission judgment by comparing the maximum number of simultaneous connections with the maximum number of simultaneous connections when accepting a connection request in the connection request call class. Are known.

Here, for example, the maximum number of simultaneous connections is derived from the assumed traffic volume and the call loss rate defined for each class by Erlang B formula or the like.

Here, the communication resource amount indicates, for example, a communication path / transmission path capacity (number of links, link throughput (bandwidth)) and switching equipment.

Securing the amount of communication resources is performed by securing the above-mentioned band on the communication path.

In the conventional method for determining the acceptance of a call in a communication system, the classifying method of the call includes the entire range of required quality (maximum speed, average speed, cell delay time, cell loss rate) handled by the information communication network. There is known a method of setting a class by classifying the data based on a threshold of an interval or a logarithmic interval. For example, "Call admission control method considering call loss rate in ATM network (IEICE Technical Report vol.8
9, No. 414, February 1990) describes a related technology.

[Problems to be solved by the invention]

In the prior art, when class setting is subdivided, classes with few call connection requests and classes without call connection requests increase, and the management becomes a load on the communication system more than necessary. As a result, there is a possibility that terminals with non-uniform quality requirements belong to a plurality of adjacent classes, so that accurate prediction becomes difficult.

Also, if the class setting is made roughly, in each class, a communication resource amount equivalent to the communication resource amount required for the call requiring the most communication resource amount belonging to each class is allocated to all calls belonging to each class. Therefore, there are disadvantages in that the number of calls to which more communication resources than necessary are allocated for each call increases, and the proportion of the communication resources allocated extra increases, which causes a reduction in the usage efficiency of the communication resources.

An object of the present invention is to provide a communication class setting method capable of efficiently operating the amount of communication resources of an information communication network, excluding the drawbacks of the conventional method.

[Means for solving the problem]

In order to achieve the above object, the present invention provides various communication resources having various required qualities such as communication speed, discard rate, delay time, call blocking rate, etc. The call is shared, the call declares the required quality to the information communication network at the time of calling, and the information communication network performs the operation of the communication resource amount allocation that guarantees the required quality,
Set a call class with the required quality as a parameter,
In the communication class setting method for a communication system that operates the communication resource amount in the class unit, one or more pieces of information such as a terminal type, statistical traffic data, and a predicted call volume are used to satisfy the required quality. In this way, a distribution of the number of calls required to guarantee the required quality or a quantity serving as a class setting reference of the communication resource amount is created, and based on the distribution, only a specific required quality is classified and the distribution is performed. The number of classes changes according to the temporal change of.

Further, the classification is performed by providing a threshold value on the axis of the required quality and the axis of the quantity serving as the class setting reference.

Furthermore, the amount used as the class setting criterion uses the number of calls or the communication resource amount necessary to guarantee required quality.

That is, the present invention achieves the above object, communication speed, discard rate / delay time, in an information communication network that handles various calls with different required qualities such as call blocking rate, when setting a class according to the difference in the required quality, From the information such as the type of terminal, statistical traffic data, and estimated traffic volume, a distribution of the number of calls or the amount of communication resources required to guarantee the required quality is created, which is necessary to guarantee the required quality. The main feature is to classify the required quality with a large number of calls or communication resources with a threshold value.

[Action]

 The operation of the present invention will be described in comparison with the prior art.

In the related art, since the entire call handled by the information communication network is classified and set for each element of required quality (speed, call loss, cell delay, cell discard, etc.), there is a class in which no call is made, The amount of communication resources is not wasted, but the management is required, so that the load on the information communication network is increased.

Also, since the required quality to which each class belongs varies, there is a gap between the amount of communication resources required for one call and the amount of communication resources actually required when calculating the amount of communication resources to be secured in advance. A difference occurs, which causes a decrease in the usage rate of the communication resource amount.

On the other hand, in the present invention, the class is set only for the required quality with a large number of calls, so that the class is not set more than necessary, and the range of the required quality belonging to the class is the predicted call. Since the range in which the amount exists is set by the threshold value, the amount of communication resources necessary for one call and the amount of communication resources actually required when calculating the amount of communication resources to be secured in advance for each class are calculated. The difference is small, and efficient operation of the communication resource amount can be realized. Hereinafter, embodiments will be described with reference to the drawings.

〔Example〕

As an embodiment, a class setting method in a communication system that handles calls with various required qualities on the basis of an ATM will be described by taking a transmission path band as an example of a communication resource amount.

FIG. 1 is a block diagram of a processing unit for determining whether a call is accepted according to the present invention. In FIG. 1, 1 is a terminal and 2 is a terminal 1.
3 is a receiving unit for receiving calls from terminals, 4 is a required communication resource amount calculation and acceptance determining unit for each class, 5 is a communication resource amount managing unit secured for each class, and 6 is a class-based communication resource amount managing unit. During the connection.

In the above communication system, with the configuration shown in FIG.
When the terminal 1 originates a call, the call quality receiving unit 3 receives the required quality declared in the communication system, the reception determining unit 4 performs class determination according to the required quality, and the class-specific communication resource amount management unit 5 The acceptance determination is performed based on the communication resource amount and the information of the connected call in the connected call management unit 6 for each class. Two examples of the class setting method at this time will be described.

Embodiment 1. In the above communication system, the cell delay quality, the cell discard quality, and the call loss rate guarantee the same quality for all calls, and the required quality of the calls is the maximum speed / average speed. The distribution of the number of calls that can guarantee the required quality is obtained from the estimated traffic volume using past statistical traffic information and the inference function. FIG. 2 shows an example of the distribution of the number of calls with respect to the required quality.

Here, a threshold value is set to a value of 0 or more for the number of calls, and a class is set for the required quality that results in the number of calls exceeding the threshold value. In FIG. 2, the threshold value is set to X and exceeds X.
This is a class in which classes 1, 8, and 3 of 7, 8, and 9 are set.

Regarding the required qualities 10, 11, 12, and 13 that do not exceed the threshold, they are handled together without setting a class for the required quality.

In creating the distribution of the number of calls with respect to the required quality in the first embodiment, there is also an embodiment in which the number of calls is obtained from the past traffic data with the actual maximum number of simultaneous connections.

In the first embodiment, the number of calls is used as an axis for determining a class setting. However, for each required quality, there is a method of using a transmission path bandwidth required for guaranteeing the quality.
In this case, a distribution of the transmission path bandwidth required for the required quality is created, and a threshold is set for the transmission path bandwidth using this to set the class.

Embodiment 2 FIG. 3 shows an example of setting a class according to the type of terminal. That is, for a communication terminal for which the required quality required for communication is determined as a standard and for a generally used communication terminal, a class is set for the required quality of each terminal. In this, for example, the current facsimile fine mode and super fine mode,
Even the same terminal has a plurality of modes with different amounts of information generation, and when the required quality in information communication is different in each mode, class setting is performed corresponding to the mode. Class 2 and Class 3, Class 4 to Class 6 in Figure 3
Is an example. Along with this, the communication terminal for which the class setting has been performed does not individually report the required quality such as the maximum speed, the average speed, the cell discard rate, the cell delay time at the time of the call connection request, but the type and the type of the communication terminal. If necessary, declare the mode to be used.

In the second embodiment, a class number may be directly reported with respect to a method of reporting when a call is made from a communication terminal.

Non-standardized and uncommon communication terminals are handled together without setting a class.

The following conventional methods can be used for the management of the amount of communication resources such as a transmission line band and the acceptance determination using the classes set in the first and second embodiments.

For each set class, the transmission line bandwidth capacity required for the communication system to guarantee the quality is calculated by using a bandwidth calculation method using MMPP or the like, and is secured for each class to guarantee the required quality. Then, the reception determination is performed by comparing the maximum number of connected calls guaranteed for each class with the number of simultaneously connected calls.

As the required transmission path bandwidth amount calculation method using MMPP,
For example, a related technique is described in "Analysis and Application of Phase Markov Reproduction Input Queue Model (IEICE Transactions B-1, 1990)".

In the present invention, there is no particular limitation on the handling of a call having the required quality for which no class has been set, and it is conceivable to perform a large classification in an information communication network that handles a wide band. Then, for the acceptance determination of a call that does not belong to the set class, the necessary transmission path bandwidth amount is calculated online by an established calculation or the like, and the acceptance determination is performed.

As a transmission path bandwidth calculation method, for example, a technique related to “Call admission control method in ATM switching network (Transactions of IEICE 1990 Spring National Convention)” is disclosed.

〔The invention's effect〕

As described above, in the class setting method of the present invention, the number of classes is not set unnecessarily, and the range of required quality belonging to one class is not unnecessarily wide. Improved utilization of the volume is realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a processing unit for an admission judgment unit in an ATM-based communication system, FIG. 2 is an example of a distribution diagram of the predicted number of calls with respect to required quality, and FIG. Is an example of setting a class according to the type of terminal. DESCRIPTION OF SYMBOLS 1 ... Terminal 2 ... Exchanger 3 ... Call receiving part 4 ... Accepting determination part 5 ... Class-specific communication resource amount management part 6 ... Class-specific connection call management part 7 ... Class 1 8 ... Class 2 9: Class 3 10,11,12,13 ... Required quality for which no class is set

Continuation of front page (56) References JP-A-4-165747 (JP, A) JP-A-3-289748 (JP, A) JP-A-3-291039 (JP, A) JP-A-2-94858 (JP) , A) (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 3/36 H04M 3/38 H04L 11/20

Claims (3)

(57) [Claims] A plurality of calls having various required qualities such as a communication speed, a drop rate, a delay time, and a call loss rate share various communication resource amounts such as a transmission line bandwidth amount and a communication line capacity in an information communication network, The call declares the required quality to the information communication network at the time of calling, and the information communication network assigns the communication resource amount that guarantees the required quality and operates the call class using the required quality as a parameter. A communication class setting method for a communication system that sets and operates the communication resource amount in the class unit, wherein the request is made by using one or more pieces of information such as a terminal type, statistical traffic data, and a predicted call amount. For quality, create a distribution of the number of calls required to guarantee the required quality or the amount of the communication resource amount that serves as a class setting reference.Based on the distribution, only a specific required quality is classified into a class. The communication class setting method characterized in that the number of class changes according to the time variation of the distribution. 2. A communication class setting method according to claim 1, wherein said classifying is performed by providing a threshold value on said axis of said required quality and said axis of an amount serving as a reference for setting said class. . 3. The communication class setting method according to claim 1, wherein the amount used as the class setting reference uses the number of calls or the communication resource amount necessary for guaranteeing required quality. .