HETEROGENOUS TRAFFIC CONNECTION ADMISSION CONTROL SYSTEM FOR ATM NETWORKS AND A METHOD THEREOF

• US 20020036981A1
• Filed: 04/08/1998
• Published: 03/28/2002
• Est. Priority Date: 04/18/1997
• Status: Active Grant

• Current Assignee: Utstarcom Korea Limited
• Original Assignee: SK Hynix Inc.
• Inventors: PARK, SI-WOO
• Granted Patent: US 6,400,685 B1
• Time in Patent Office: Days
• US Class Current: 370/230
• CPC Class Codes: H04L 12/5602 Bandwidth control in ATM Networks, e.g. leaky bucket
• CPC Class Codes: H04L 2012/5632 Bandwidth allocation
• CPC Class Codes: H04L 2012/5649 Cell delay or jitter
• CPC Class Codes: H04L 41/0896 Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities flow or congestion control using dynamic resource allocation, e.g. in-call renegotiation, H04L47/76
• CPC Class Codes: H04L 41/0897 by horizontal or vertical scaling of resources, or by migrating entities, e.g. virtual resources or entities
• CPC Class Codes: H04L 41/32 Specific management aspects for broadband networks
• CPC Class Codes: H04L 41/5022 by giving priorities, e.g. assigning classes of service

Abstract

A heterogeneous traffic Connection Admission Control system in Asynchronous Transfer Mode (ATM) networks and a method therefor, dynamically controls a system capacity to a delay demand bound of a heterogeneous traffic class in order to meet a cell loss rate for an user'"'"'s demand, reduce the influence of mutual traffic interferences and enable the Connection Admission Control in a real time, in a manner that an equivalent band width of each traffic class is calculated using a distribution function of the number of cell estimated through the traffic measurement of each of class, a capacity of a transferring channel is determined in proportion to the equivalent bandwidth calculated upon the connection request of a new call; and the link capacity determined above is compared with the results of the maximum cell rate of the call requesting the new call plus the equivalent bandwidth of all classes.

Claims

1. A heterogeneous traffic Connection Admission Control system in ATM networks comprises:

a Connection Admission Control means for determining whether the connection admission is acceptable by a maximum cell rate obtained by the combination of equivalent band widths calculated by each of a Connection Admission Controller upon the connection request of calls inputted into respective connection node;

a bandwidth allotting means for determining a service capacity of each class in proportion of the equivalent bandwidth of each traffic class to the summing up bandwidth of all traffic classes input into the Connection Admission Control means;

means for temporally storing ATM cells through the Connection Admission Control means; and

,

a server for fetching the ATM cell of each class from the storing means in round robin mode and transferring it to a transferring channel.

2. The heterogeneous traffic Connection Admission Control system in ATM networks as claimed in claim 1, in which:

the Connection Admission Control means compares the summing up the sum of the equivalent bandwidths calculated by each of the Connection Admission Controller to the equivalent bandwidths of corresponding classes with the link capacity obtained by a bandwidth allotting determination means, so that if the summed up value is less than the link capacity, the connection request is allowed.

3. The heterogeneous traffic Connection Admission Control system in ATM networks as claimed in claim 1, in which:

the Connection Admission Control means includes a plurality of Connection Admission Controllers constructed in parallel to be corresponded to each traffic class introduced into network node for calculating the equivalent bandwidth of each traffic class using a distribution function of the number of cells estimated through the traffic measurement and to control the connection admission of call upon the request of a new call.

4. The heterogeneous traffic Connection Admission Control system in ATM networks as claimed in claim 1, in which:

the storing means includes a plurality of buffers connected to be corresponded to each of the controller in the Connection Admission Control means for storing the ATM cell temporarily to be transferred.

5. The heterogeneous traffic Connection Admission Control system in ATM networks as claimed in claim 4, in which:

the size of each buffer is changed to meet the delay bound requested by each traffic according as the service capacity changed at every updating period time.

6. A heterogeneous traffic Connection Admission Control method in ATM networks comprises steps of:

calculating an equivalent band width of each traffic class using a distribution function of the number of cell estimated through the traffic measurement of each of class;

determining a capacity of a transferring channel in proportion to the equivalent bandwidth calculated upon the connection request of a new call; and

,

comparing the link capacity determined above with the results of summing up the maximum cell rate of the call requesting a new call to the equivalent bandwidth of all classes to control the connection request.

7. The heterogeneous traffic Connection Admission Control method in ATM networks as claimed in claim 6, in which:

the comparing step further includes steps of accepting the connection admission, if the summing up of the maximum cell rate of the call requesting a new call connection and the equivalent bandwidth of all classes is less than the link capacity, the connection request is accepted, and rejecting the connection admission, if the summing up is larger than the link capacity.

8. The heterogeneous traffic Connection Admission Control method in ATM networks as claimed in claim 6, in which:

the heterogeneous traffic Connection Admission Control method further comprises steps of storing ATM cells at each of class buffer according to the link capacity, temporarily, if the new call connection admission is acceptable, fetching the ATM cell of each of class from the buffers in the round robin mode and transferring it to a transferring channel.

9. The heterogeneous traffic Connection Admission Control method in ATM networks as claimed in claim 6, in which:

the buffer size is changed to dynamically meet the delay bound requested for each of traffic according to the service capacity changed at every updating period time.