KR100295459B1 - Signal Delay Analysis Method for Arrangement of Physical Entities of Functional Entities - Google Patents

Abstract

The present invention relates to a method for analyzing a signal delay for arranging a physical entity of a functional entity. When the functional entity is placed in a physical entity, a delay parameter, target functional entity placement cases, a physical entity connection relationship, a functional entity connection relationship, and an information flow diagram are provided. By inputting them, the signal delay for each information flow case is calculated for each possible physical entity layout, and the network design stage defined by the functional level determines the deployment case with the smallest signal delay. There is an advantage that can be obtained, and this is accompanied by the advantage of accurately predicting the delay in the actual system construction, since it is possible to obtain a value that is closer to the actual value than to calculate and compare only the message delay on the existing transmission path.

Description

Signal Delay Analysis Method for Arrangement of Physical Entities of Functional Entities

The present invention relates to a method for analyzing a signal delay for arranging a physical entity of a functional entity. When the functional entity is placed in a physical entity, a delay parameter, target functional entity placement cases, a physical entity connection relationship, a functional entity connection relationship, and an information flow diagram are provided. The present invention relates to a method for determining a deployment case having the smallest signal delay by calculating signal delays according to each information flow case for each functional entity deployment case possible for a physical entity.

In general, a representative method of the signal delay analysis method is a method of considering only message transmission delays on transmission paths between physical entities, which may be illustrated in FIG. 1.

1 is a diagram illustrating a virtual ATM wireless network structure for applying a conventional signal delay analysis method, comprising: first and second physical systems 1 and 2 having functional entities embedded therein;

Protocol processing elements (11, 12) having a protocol processing delay value;

An interface 10 having an interface transmission delay value is provided.

In the method of obtaining the signal delay in the state having the above arrangement, only the element delayed in the transmission path between the first physical system 1 and the second physical system 2, that is, the interface 10, was calculated.

This delay calculation has a problem that the delay in the functional entities embedded in each physical system and the delay in the protocol processing element are not calculated, and thus it is not appropriate to predict the correct delay time when constructing the system.

Therefore, there is a need for a method of analyzing the signal delay when constructing a practical system that considers not only the transmission path delay but also the delay elements in each physical entity.

In view of the conventional problems and requirements as described above, the present invention defines a signal delay element in each physical system and between physical systems, and in each information flow (call processing or mobility processing) according to the case of each batch. The goal is to find the overall signal delay for each batch and then compare these values in each batch to select the best batch.

1 is a block diagram showing a virtual ATM wireless network structure for applying a conventional signal delay analysis method.

Figure 2 is a flow chart showing a schematic process showing the process of the physical entity arrangement of functional entities according to the present invention

3A is a layout diagram for analyzing signal delay in a state in which functional entity C is embedded in a second physical system according to the present invention;

3B is a layout diagram for analyzing signal delay in a state in which functional entity C is embedded in a third physical system according to the present invention;

3C is a diagram illustrating a functional entity connection relationship in the arrangement of FIGS. 3A and 3B.

3D is an information flow diagram illustrating the information flow in the arrangement of FIGS. 3A and 3B.

<Description of Symbols for Major Parts of Drawings>

1, 2, 3: physical system 11-15: protocol processing element

16: wireless interface 17: trunk interface

In order to achieve the above object, in the signal delay analysis method in the case of placing the functional entity in the physical entity in the construction of the communication network,

A first step of inputting signal delay elements in a physical entity and a transmission delay value on a transmission path;

A second process of calculating a signal delay according to each information flow for each arrangement case of a functional entity through the input elements;

And a third process of determining a batch case having the smallest signal delay by comparing the signal delay calculation result for each batch.

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a flow chart showing a schematic process showing a process of physical entity arrangement of a functional entity according to the present invention, the first process (S1) of inputting parameters and information required for calculating a signal delay;

A second step (S2) of calculating a signal delay for each information flow case by applying the parameters and information input in the above process;

Comprising a third step (S3) to compare the analysis results for each batch calculated in the above process to derive and output the batch case having the minimum signal delay.

In this case, the parameters and information input in the first process may include a delay parameter, information on a case of a target functional entity arrangement, information representing a physical entity connection relationship, information representing a functional entity connection relationship, and information related to a (mobility processing) information flow. There is.

The delay parameters include a radio interface delay according to an average signal message length, a protocol stack processing delay, a functional entity processing delay, and the like, and these delay values are used when a signal message is transferred from a first functional entity to a second functional entity. These messages are the delay values that accumulate while actually going through the delay elements of the physical entity.

The information on the target functional entity arrangement case may include information on the placement of functional entities (eg, terminal access control functions) on physical entities (eg, base station controllers), and the case where the arrangement is obvious (eg, call control functions on exchanges). On the other hand, it may be difficult to determine the location of the deployment.In this case, information on the functional entity to be determined as the location of the deployment (for example, the terminal access control function is arranged in the base station controller or If placed in).

The information on the physical entity connection relationship specifies the connection relationship between each physical entity and is limited to one connection configuration (eg, terminal (L)-base station (M)-base station controller (N)-exchanger ( P)-HLR (or SCP) (Q)).

The information on the functional entity connection relationship is limited to one connection configuration by specifying the connection relationship between each functional entity (for example, an intelligent network DFP (Distributed Functional Plane)).

The information related to the information flow diagram refers to a scenario in which functional entities interact to send and receive a signal message to perform a network function (eg, terminal location registration, mobile call origination, switching period handover, base station control period handover). Etc).

A second process of calculating the signal delay by receiving the above parameters and information will be described in detail with reference to the drawings.

3A and 3B are diagrams showing examples of applying the signal delay analysis method of the present invention to a virtual ATM wireless network structure, wherein the first, second, and third physical systems (1, 2, 3) having functional entities embedded therein are illustrated. );

Functional entities (A, B, C, D) having a functional entity processing delay value;

Protocol processing elements 11-15 having a protocol processing delay value;

A wireless interface 16 having a wireless interface transmission delay value;

A trunk interface 17 having a trunk interface transmission delay value is provided.

In the above configuration, FIG. 3A is a layout diagram for analyzing a signal delay in a state in which the functional entity C is embedded in the second physical system 2, and FIG. 3B is a diagram in which the functional entity C is embedded in the third physical system 3. Layout for analyzing signal delay in a state.

FIG. 3C is a diagram illustrating a functional entity connection relationship in the arrangement of FIGS. 3A and 3B, where functional entities A, B, and D are one-to-one, and functional entities C are connected to B and D, respectively.

FIG. 3D is an information flow diagram illustrating the flow of information in the arrangement of FIGS. 3A and 3B, wherein the flow of information between functional entity A and functional entity B is 2, and the flow of information between functional entity B and functional entity C is also 2; It can be seen that the information flow between the functional entity C and the functional entity D is four times.

It is assumed that the following parameters and information are input in the first process for each of the above deployment cases.

First, the delay parameters are shown in Table 1 below.

Table 1 Delay Parameters

sign Explanation In-Drawing Display Delay (ms) f Functional entity processing delay A, B, C, D One p Protocol Stack Processing Delay 11, 12, 13, 14, 15 One t Trunk Interface Transmission Delay 17 0.01 a Wireless interface transmission delay 16 30

Second, in the case of arranging the target functional entity, the analysis object is classified into two cases, in which the functional entity C is disposed in the second physical entity and the third physical entity, as shown in FIGS. 3A and 3B.

Third, as shown in FIG. 3A and FIG. 3B, the physical entity connection relationship is connected to the first physical system team 1 and the second physical system team 2, and the second physical system team 2 is connected to the third physical system team 3. Have a relationship.

Fourth, as shown in FIG. 3C, the functional entity connection relationship is such that functional entities A, B, and D are one-to-one, and functional entities C are connected to B and D, respectively.

For example, a call control function entity in a network has a connection relationship with a call control agent function entity of a terminal.

Fifth, the information flow defines a message sequence chart for call processing, mobility processing, and the like as shown in FIG. 3D.

In the above state, the signal delays of the respective arrangements of FIGS. 3A and 3B are analyzed, and FIG. 3A is as follows.

① Delay time between functional entity A and functional entity B

-Number of information flows: 2

-Number of functional entities: 2

Number of protocol processing elements: 3

-Number of wireless interfaces: 1

-Delay calculation value between functional entities A and B

=> (f × 2 + p × 3 + a) × 2 => (1 × 2 + 1 × 3 + 30) × 2 = 70 (ms)

② Delay time between functional entity B and functional entity C

(f × 2) × 2 => (1 × 2) × 2 = 4 (ms)

③ Delay time between functional entity C and functional entity D

(f × 2 + p × 3 + t) × 4 => (1 × 2 + 1 × 3 + 0.01) × 4 = 20.04 (ms)

④ Total delay time of each functional entity: 70 + 4 + 20.04 = 94.04 (ms)

3B is as follows.

① Delay time between functional entity A and functional entity B

-Number of information flows: 2

-Number of functional entities: 2

Number of protocol processing elements: 3

-Number of wireless interfaces: 1

-Delay calculation value between functional entities A and B

=> (f × 2 + p × 3 + a) × 2 => (1 × 2 + 1 × 3 + 30) × 2 = 70 (ms)

② Delay time between functional entity B and functional entity C

(f × 2 + p × 3 + t) × 2 => (1 × 2 + 1 × 3 + 0.01) × 2 = 10.02 (ms)

③ Delay time between functional entity C and functional entity D

(f × 2) × 4 => (1 × 2) × 4 = 8 (ms)

④ Total delay time of each functional entity: 70 + 10.02 + 8 = 88.02 (ms)

As a result of each signal delay analysis, it can be seen that the arrangement according to FIG. 3B has a shorter delay time than the arrangement according to FIG. 3A.

As this simple example shows, the interaction between functional entities C and D is more frequent than that between B and C, so it can be concluded that it is more advantageous to place C and D on the same physical entity.

In this way, complex functional entities, physical entity linkages, and layout structures to which complex information flows are applied can be arranged with minimal delay.

As described in detail above, the present invention has an advantage of enabling efficient network design by determining a deployment case having the least signal delay in the network design stage defined by the functional level, which is only a message delay on the existing transmission path. It is possible to obtain a value closer to the actual value than to calculate and compare, which has the advantage of accurately predicting the delay in the actual system construction.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (3)

In the method of analyzing the signal delay when the functional entity is placed in the physical entity when constructing the communication network, A first step of inputting signal delay elements in a physical entity and a transmission delay value on a transmission path; A second process of calculating a signal delay according to each information flow for each arrangement case of a functional entity through the input elements; And a third process of comparing the calculation results of the signal delay calculations for each batch to determine a batch case having the smallest signal delay. The method of claim 1, Information input to the signal delay element in the physical entity in the first process includes a delay parameter; Information on the case of the target functional entity arrangement; Information indicating a physical entity connection relationship; Information indicating a functional entity connection relationship; A signal delay analysis method for arranging physical entities of functional entities, comprising information related to information flow. The method of claim 3, wherein The delay parameter comprises: an air interface delay parameter according to an average signal message length; Each protocol stack processing delay parameter; A signal delay analysis method for arranging physical entities of a functional entity, comprising: a functional entity processing delay parameter.