Specifications

Dispatch Call Model
Network Planning
A-3 68P81095E55-E August 08, 2000
Dispatch Call Model
Dispatch calls are half-duplex and tend to be brief. Some sample information used to
determine a dispatch call capacity on a iDEN system is summarized in Table A-1 .
Note
Call Models vary. Call Models depend on markets and marketing strategies.
The information provided is for example only.
Table A-1 Sample Dispatch Call Model
Interconnect Call Model
In most cases an interconnect call will place a greater load on the system. Exchanges
tend to be longer and require more resources. A typical Interconnect call models is
summarized in Table A-2 .
Table A-2 Sample Interconnect Call Model
Note
Call Models vary. Call Models depend on markets and marketing strategies.
The information provided is for example only.
Characteristic Value
Percent Dispatch Traffic (Erlang) 50%
Call Arrival Rate (per Subscriber or Dispatcher per Busy Hour) 1.2
Mean Call Hold Time 21 sec.
Mean Transmission per Call 4
Channel Hang Time 6 sec.
Server Usage per Subscriber (per Busy Hour) 0.009E
Mean Number of Servers Illuminated per Dispatch Call 3
Traffic Intensity per Subscriber (Busy Hour) (3 servers x 0.007) 0.027 E
Group Size 5 Users
Voice Activity Factor 0.35
Traffic Model Erlang C
GOS (Grade of Service) RF Blocking 5%
Characteristic Value
Percent Interconnect Traffic (Erlang) 50%
Call Arrival Rate (per Subscriber or Dispatcher per Busy Hour) 0.6
Mean Call Hold Time 132 sec.
Mean Call Handover Rate 4/minute
Traffic Intensity per Subscriber (Busy Hour) 0.022E
Mean Number of Servers Illuminated per Interconnect Call 1
Voice Activity Factor 0.35
Traffic Model Erlang B
GOS (Grade of Service) RF Blocking 1%