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2014-10-24, 08:59 AM
Dimensioning voice networks – 2G Example
ITU Academy
November 2013
CONTENTS
Introduction
NETWORK DESIGN GENERAL PROCESS
I. Erlang law
TRAFFIC MEASUREMENTS
ERLANG DEFINITION
ERLANG B LAW (1)
ERLANG B LAW (2)
APPROXIMATION OF ERLANG LAW
DEFINITIONS
EXAMPLES (1)
EXAMPLES (2)
DIMENSIONING RESOURCES ON THE RADIO INTERFACE
BUSY HOUR (1)
BUSY HOUR (2)
EVOLUTION OF TRAFFIC DURING THE WEEK
BUSY HOUR (DATA TRAFFIC)
EXAMPLES OF TRAFFIC DISTRIBUTION – PROFESSIONAL MMS SERVICES
EXAMPLES OF TRAFFIC DISTRIBUTION – RESIDENTIAL MMS SERVICES
BLOCKING PROBABILITY
OFFERED TRAFFIC AND CARRIED TRAFFIC (1)
OFFERED TRAFFIC AND CARRIED TRAFFIC (2)
ERLANG TABLE EXAMPLE
EFFICIENCY EVOLUTION
ERLANG CURVES
ERLANG C DISTRIBUTION (WITH QUEUE)
ERLANG C FORMULA (1)
ERLANG C FORMULA (2)
UTILIZATION OF THE QUEUES
II. Dimensioning Process and Measurements
DIMENSIONING PHASES – GSM NETWORK
TRAFFIC AND DIMENSIONING EVALUATION ELEMENTS
DATA TO ESTIMATE THE TRAFFIC
EXAMPLE OF SCENARIO
PROCESS
III. Traffic and mobility model
ELABORATION OF TRAFFIC MODEL
RELATION WITH OTHER PARAMETERS
TRAFFIC MODEL FOR TCH LOAD EVALUATION (1)
TRAFFIC MODEL FOR TCH LOAD EVALUATION (2)
TRAFFIC MODEL FOR THE SYSTEM DIMENSIONING VMS
DENSITIES [3GPP]
TRAFFIC AND MOBILITY MODEL
TRAFFIC MATRICES (1)
TRAFFIC MATRICES (2)
EQUIPMENTS FOR THE PROCESSING OF THE TRAFFIC
IV. BSS dimensioning
TCH CHANNELS DIMENSIONING
SDCCH DIMENSIONING (1)
SDCCH DIMENSIONING (2)
SDCCH NUMBER PER CELL
AGCH CHANNEL DIMENSIONING
PCH CHANNEL DIMENSIONING
NUMBER OF TRX PER CELL
TCH AND SDCCH CHANNELS AND NUMBER OF CELLS DIMENSIONING
BSC DIMENSIONING
RNC DIMENSIONING
BSC CONTROLLER CAPACITY
ABIS/ATER/A INTERFACES
DIMENSIONING BASED ON OBSERVED CONGESTION (1)
DIMENSIONING BASED ON OBSERVED CONGESTION (2)
V. NSS dimensioning
DIMENSIONING OF MSC
MSC TRUNK DIMENSIONING
NUMBER OF INTER-MSCS LINKS
LINK DIMENSIONING MSC - VMS
HLR AND VLR DIMENSIONING
LINK DIMENSIONING MSC - HLR
LINK DIMENSIONING MSC – SMS ET MSC - EIR
NUMBER OF SIGNALING LINKS
CPU PROCESSING CAPACITY OF THE MSC
AVERAGE CPU PROCESSING TIME
CONCLUSION
ITU Academy
November 2013
CONTENTS
Introduction
NETWORK DESIGN GENERAL PROCESS
I. Erlang law
TRAFFIC MEASUREMENTS
ERLANG DEFINITION
ERLANG B LAW (1)
ERLANG B LAW (2)
APPROXIMATION OF ERLANG LAW
DEFINITIONS
EXAMPLES (1)
EXAMPLES (2)
DIMENSIONING RESOURCES ON THE RADIO INTERFACE
BUSY HOUR (1)
BUSY HOUR (2)
EVOLUTION OF TRAFFIC DURING THE WEEK
BUSY HOUR (DATA TRAFFIC)
EXAMPLES OF TRAFFIC DISTRIBUTION – PROFESSIONAL MMS SERVICES
EXAMPLES OF TRAFFIC DISTRIBUTION – RESIDENTIAL MMS SERVICES
BLOCKING PROBABILITY
OFFERED TRAFFIC AND CARRIED TRAFFIC (1)
OFFERED TRAFFIC AND CARRIED TRAFFIC (2)
ERLANG TABLE EXAMPLE
EFFICIENCY EVOLUTION
ERLANG CURVES
ERLANG C DISTRIBUTION (WITH QUEUE)
ERLANG C FORMULA (1)
ERLANG C FORMULA (2)
UTILIZATION OF THE QUEUES
II. Dimensioning Process and Measurements
DIMENSIONING PHASES – GSM NETWORK
TRAFFIC AND DIMENSIONING EVALUATION ELEMENTS
DATA TO ESTIMATE THE TRAFFIC
EXAMPLE OF SCENARIO
PROCESS
III. Traffic and mobility model
ELABORATION OF TRAFFIC MODEL
RELATION WITH OTHER PARAMETERS
TRAFFIC MODEL FOR TCH LOAD EVALUATION (1)
TRAFFIC MODEL FOR TCH LOAD EVALUATION (2)
TRAFFIC MODEL FOR THE SYSTEM DIMENSIONING VMS
DENSITIES [3GPP]
TRAFFIC AND MOBILITY MODEL
TRAFFIC MATRICES (1)
TRAFFIC MATRICES (2)
EQUIPMENTS FOR THE PROCESSING OF THE TRAFFIC
IV. BSS dimensioning
TCH CHANNELS DIMENSIONING
SDCCH DIMENSIONING (1)
SDCCH DIMENSIONING (2)
SDCCH NUMBER PER CELL
AGCH CHANNEL DIMENSIONING
PCH CHANNEL DIMENSIONING
NUMBER OF TRX PER CELL
TCH AND SDCCH CHANNELS AND NUMBER OF CELLS DIMENSIONING
BSC DIMENSIONING
RNC DIMENSIONING
BSC CONTROLLER CAPACITY
ABIS/ATER/A INTERFACES
DIMENSIONING BASED ON OBSERVED CONGESTION (1)
DIMENSIONING BASED ON OBSERVED CONGESTION (2)
V. NSS dimensioning
DIMENSIONING OF MSC
MSC TRUNK DIMENSIONING
NUMBER OF INTER-MSCS LINKS
LINK DIMENSIONING MSC - VMS
HLR AND VLR DIMENSIONING
LINK DIMENSIONING MSC - HLR
LINK DIMENSIONING MSC – SMS ET MSC - EIR
NUMBER OF SIGNALING LINKS
CPU PROCESSING CAPACITY OF THE MSC
AVERAGE CPU PROCESSING TIME
CONCLUSION