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4.3.2
 
Usability 
Table 4-2: Evaluation of Usability quality attribute for TMMS Service based on IMS 
4.3.3
 
Modifiability 
Table 4-3: Evaluation of Modifiability quality attribute for TMMS Service based on IMS 
U1: Distribution of the client application 
Client can choose between manually and automatically retrieving of the client 
application. 
U2: Which parameters are necessary for the client to communicate with the 
Proxy-Relay
Parameters needed are: The TMMS PR PSI, the port number where the client will 
receive NOTIFY messages. 
U3: Address handling (GSM SMS vs. TMMS addresses)
 Ter
m
in
al
 In
tegr
at
io
n 
IMS specific. SIP URIs are used to address TMMS Clientsclients, and TEL URIs 
are used to address GSM SMS clients. Only the PRproxy-relay must treat these 
different. 
U4: Client registration 
Client must subscribe to the newmessage-alert. 
U5: Client unregistration
Regi
stration 
Client unregisters to the service by unsubscribing from the newmessage-alert. 
M1: Add more servers to achieve better scalability
Scalabil
ity 
IMS helps in some way 
Since the TMMS PR is addressed through DNS is it possible to use normal DNS 
based network load balancing techniques to add more servers. 
M2: Extend the service to support new media types 
The service uses MIME types to describe the media types of the message body. 
Only the client application must be upgraded to present new media types to the 
user. 
M3: Restrict the media types supported by the service 
The TMMS PR may filter the media types in a message, based on the Content-
Type, to restrict which media types are allowed to be sent between clients. 
M4: Support new Carrier Access Network (CAN) 
IMS specific. 
M5: Port the service to a different framework