Method for determining the required load capacity for a number of communication connections which can be statistically multiplexed

A method for determining load variables, the method which comprises the steps of:

• providing an asynchronous transfer mode (ATM) communication device handling M connections which can be statistically multiplexed;
• and
• determining a still transmissible average sustainable cell rate SCRC of a new connection and a still transmissible peak cell rate PCRC of the new connection from equation Gz:
• loadz=Sz+Q(loadz)* Vz for Z=C,
• where:
• loadc=SCRc;
• SC=SM+SCRC with
• SM=Σ[SCRi] and 1<=i<=M;
• Q(loadC) is a fixed function of a capacity loadC ;
• VC=VM+(SCRC)*(PCRC−SCRC) with
• VM=Σ[SCRi*( PCRi−SCRi)] and 1<=i<=M;
• SCRC=SCRMIN+a*x;
• PCRC=PCRMIN+x;
• a=(SCRM+1−SCRMIN)/(PCRM+1−PCRMIN);
• x=PCRC−PCRMIN;
• PCRi is a peak cell rate of a connection with index i;
• SCRi is an average sustainable cell rate of the connection with the index i;
• SCRM+1 is an average sustainable cell rate of the new connection;
• PCRM+is a peak cell rate of the new connection;
• SCRMIN is an average minimum sustainable cell rate of the new connection;
• and
• PCRMIN is a minimum peak cell rate of the new connection.

An asynchronous transfer mode (ATM) communication device with a maximum capacity Rmax, comprising:

• a device for indicating a still available residual capacity Rrest of the ATM communication device having M existing connections, where Rrest=Rmax −loadM, said device being programmed for determining the loadM for the M existing connections from equation Gz:
• loadz=Sz+Q(loadz)*Vz for Z=M,
• where:
• loadM is a capacity of the M existing connections;
• SM=Σ[SCRi] with 1<=i<=M;
• Q(loadM) is a fixed function of the loadM;
• VM=Σ[SCRi*(PCRi−SCRi)] with 1<=i<=M;
• PCRiis a peak cell rate of a connection with index i;
• and
• SCRiis an average sustainable cell rate of the connection with the index i.