Contents Telektronikk - Telenor

Erlang
Erlang
Erlang
122
7
6
5
4
3
2
1
0
0000 0400 0800 1200 1600 2000 2400
Figure 3 Outgoing traffic (average of weekdays
during Period 1), Group 1
40
30
20
10
0
0000 0400 0800 1200 1600 2000 2400
50
40
30
20
10
12 000
10 000
8 000
6 000
4 000
2 000
Figure 4 Outgoing traffic (average of weekdays
during Period 1), Group 2
0
0000 0400 0800 1200 1600 2000 2400
Figure 5 Outgoing traffic (average of weekdays
during Period 1), Group 3
0
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Figure 6 Mean number of outgoing calls per day (Period 1)
Table 2 Number of outgoing calls per weekday divided into categories
Period 1 Period 2
Category Mean Std.dev. Share Mean Std.dev. Share
Local 6604.5 375.2 58.9 % 6994.6 304.9 59.4 %
Neighbouring counties 90.8 10.9 0.8 % 96.8 15.4 0.8 %
Domestic long-distance 3316.0 243.4 29.6 % 3515.8 213.9 29.8 %
International 637.7 92.8 5.7 % 587.6 71.7 5.0 %
Mobile telephone 106.4 12.8 0.9 % 103.8 9.6 0.9 %
Paging 38.6 12.0 0.3 % 52.0 17.0 0.4 %
Special services 406.2 42.3 3.6 % 414.7 46.8 3.5 %
Toll-free numbers 14.8 4.0 0.1 % 18.8 6.7 0.2 %
- Group 1 (the most expensive calls):
International calls
- Group 2 (the expensive calls):
Domestic long-distance calls, calls to
mobile telephone, and paging
- Group 3 (the inexpensive calls):
Local calls and calls to
neighbouring counties, special
services (some of
which are free of charge),
and toll-free numbers.
Figures 3, 4 and 5 show the
24-hour traffic profiles of
these three groups (registered
during Period 1). We see that
the 24-hour profiles of Group
2 and Group 3 are quite similar.
For Group 1 (international
calls) we observe a
peak between 1500 and 1600,
which we believe is due to
calls across the Atlantic.
11215.0 660.5 99.9 % 11784.1 500.1 100.0 %
Table 3 Outgoing traffic (in Erlang) divided into categories
Period 1 Period 2
Category Mean Std.dev. Share Mean Std.dev. Share
Local 13.72 0.68 52.0 % 15.08 0.78 53.2 %
Neighbouring counties 0.26 0.05 1.0 % 0.31 0.08 1.1 %
Domestic long-distance 10.21 0.55 38.7 % 10.80 0.38 38.1 %
International 1.63 0.19 6.6 % 1.54 0.20 5.6 %
Mobile telephone 0.20 0.03 0.7 % 0.18 0.04 0.6 %
Paging 0.010 0.00 0.04 % 0.014 0.00 0.05 %
Special services 0.33 0.06 1.2 % 0.32 0.04 1.1 %
Toll-free numbers 0.05 0.03 0.2 % 0.07 0.03 0.2 %
Total 26.41 1.09 100.4 % 28.35 0.96 100.0 %
3.2 Week profile
The statistics are taken during Period 1.
The mean number of successful outgoing
calls per day is shown in Figure 6. The
results show that among the weekdays
there are small variations, but the number
of calls is highest on Monday and lowest
on Friday.
A similar profile is observed in terms of
the traffic volume. An interesting observation
is that while the mean number of
calls on holidays (Saturdays and Sundays)
is 6.7 % of the average on a weekday,
the corresponding measure for traffic
volume is 8.3 %, which means that
the mean duration of conversations during
weekends is about 25 % longer than
that on a weekday. Later (3.5) we shall
confirm this when call holding times are
discussed.