Information Technology Reference
In-Depth Information
Tabl e 1.
Application types and applications
Build-in Webkit 533.1
Opera Mobile 11.5.2
UC Browser 7.9.3
Firefox 10.0
Browser
Google Map 6.3.0
Baidu Map 2.1.0
Sogou Map 2.1.0
Map
Xiaomi Music 1.4.3
Duomi Music 4.0.1.00
Douban FM 2.1.0
Online Music Player
Fring 3.9.3.33
Tango 1.6.8607
Skype 2.5.0.108
Video Call
5.1 Charging System
Issue 1.
Intuitively, all the three operators should charge for the same layer.
We find that only China Mobile take Byte as statistical units. So we start with
it. Figure 4 shows the (1
RE
) of each layer by three experiments. It is obvious
that the Network Layer's data volume is most close to the operator's charging
result. The error is less than 1.5%. Therefore we can conclude that China Mobile
is charging for the trac of network layer. We can get the same result for China
Unicom and China TeleCom, just by producing a large trac (1MB is enough),
so that the RE is different at each layer even the units of each element in formula
1 is KB or 10KB.
−
Issue 2.
There are two main causees of the difference between TraSt and oper-
ators charging result. First, since experiment lasts long time, it is likely to occur
packet loss. Second, there may exists some tra
c that are not charged by the
operators.
To verify the second cause, we use TraSt to count tra
c consumption of each
Network Layer protocol, including ARP, ICMP, ICMPv6 IPv4, IPv6 and others.
Figure 5 shows the result. Since 217 + 160 = 377, which is exactly the trac
consumption of IPv4. So we can conclude that China Mobile is not charging for
ARP and ICMPv6. It is very hard to test for China Unicom and China Telecom
because of the larger units in the bill. But we believe the results are the same.
Issue 3.
For China Mobile we send a UDP packet with 1 Byte payload, its
total length is 29 Byte. The charging result is 29 Byte. So the smallest charging
units of China Mobile is Byte. For China Telecom, we send a UDP packet with
1 Byte payload two times at a same bearer. The charging result is 1 KB. So the
China Telecom will add the packet length in Byte at each bearer and count the
part less than 1 KB as 1KB. For China Unicom, it is more complicated since the
