All entities within the IMS
are interconnected using routers and IP interfaces, so at the transport layer IP must
be the first source for capturing session data.
Obviously, since the facilities operate somewhat differently than traditional TDMbased
facilities, the metrics used to measure the quality of the facility will change,
but the most significant change is the capacity required. The amount of signaling that
takes place in an IMS environment is many times higher than found in traditional SS7
networks. In fact in many trials the network vendor Tekelec has participated in, there
has been a ten-fold increase in the signaling volume (just voice sessions alone).
There are many reasons for this such as registration and security procedures. When
you add in video, messaging, audio, and any other media session supported in IMS, the
volume grows exponentially. This is because the IMS requires much more interaction
between the user device and the network. These transactions must be captured by the
monitoring system in order for the monitoring system to be able to provide the status
of the device, QoS of the network transactions, and the overall health of the entities
within the IMS.
One benefit of monitoring IMS networks is that everything is managed in one network
architecture with the same signaling protocol. SS7 is strictly voice, but SIP controls
everything within the IMS.
Pages:
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109