Information Technology Reference
In-Depth Information
3G-324M multimedia wireless transmission protocol
Video codec
H.263, (MPEG-4, H.261 ...)
Video I/O
equipment
Audio I/O
equipment
Audio codec
3G-AMR, (G.723.1)
Receive path
delay
H.223
multiplex/
demultiplex
H.223
Data protocol
(V.14, LAPM, ...)
User data
applications
3GPP
network
NSRP(LA
PM/V.42)
H.245
CCSRL
System
control
Call set-up
Figure 3.4
3G-324M structure.
Application
layer
User application
Sensor network API
Mid
layer
Sensor network Middleware
Sensor network
interface
UMTS network
interface
Communication
layer
Packet switch
network
Circuit switch
network
Physical
layer
Physical layer
Physical layer
Figure 3.5
Sensor node and gateway architecture.
access of the sensor network, where the user can request data anywhere and
anytime. The gateway is an expensive device and has a short lifetime.
3.3.4 Network Framework
The proposed architecture of a wireless sensor network gateway is shown
in Figure 3.5. It is a flexible architecture that supports a range of communi-
cation technologies for sensors and user applications with no or minimum
modification.
