Advanced Video Distribution for Wireless E-Healthcare Systems - E-Healthcare Systems and Wireless Communications - page 360

case absence of any coordination can be guaran-
teed and the self-organised network should use
the mechanism of randomisation with a degree
of probability. It is obvious that a self-organised
network can adopt the mechanism of randomisa-
tion with various intervals of probability. The most
extreme case is “zero” coordination. Essentially,
this type of communication is not based on sig-
nalling messages, but is inferred from the local
environment. A node within the local network
reacts to the change within its environment, to
changing statuses of neighbour nodes and to the
whole network. Based on this information, the
node makes a decision and reacts accordingly.

react to the changing environment using the same
“control” algorithm (Prehofer & Bettster, 2005;
Zvikhachevskaya & Mihaylova, 2009).

THE PROPOSED METHODOLOGY

The selected paradigms constitute the key compo-
nent of the proposed methodology for developing
self-organised network functions for e-Health
services. These paradigms are used as a theoreti-
cal foundation for developing new self-organised
features and protocols (Wood, 2006) for hetero-
geneous e-Health network architectures. The
proposed methodology allows the creation of the
desired e-Health network and can be developed
and implemented according to the following steps:

Paradigm #3: Discovery Mechanism
and Adaptive Network Function

In this scenario, in order to achieve self-organi-
sation we should maximise the update frequency
for the network state information. One approach
is to employ discovery (reactive or proactive)
mechanism, which are implemented by utilising
the Query or Advertisement techniques. Also, the
capability of nodes to react on change within the
transformed environment is important. There are
three types of protocols, which allow node adap-
tion (Zvikhachevskaya and Mihaylova, 2009;
Hazelman, Kulik & Balakrishman, 1999):

Step 1: Overview of used and implemented wire-
less standards and their network management
system should be investigated, aiming to
explore limitations and possibilities of the
each standard that can be integrated into the
'Global' E-Health Network;
Step 2: Presents an idea of Coordination among
different users of the network. Wireless
communication protocols for e-Health ap-
plications should be proposed with respect
to each chosen standard services in order
to investigate effectiveness of networking
existing wireless data-links for different
healthcare services;
Step 3: Development of the cross-standard pro-
tocols that would allow nodes to react on
changing environment utilising the same
control algorithm. Following this concept, a
translator of data packets from one network
into a format compatible with another should
be proposed and network management
functions as well as their communication
protocols.

• The protocol designed with respect to ad-

aptation to node failure;

• The protocol designed to react on topo-

logical change by changing performance
(timers);

• The protocol designed to obtain the opti-

mal routing algorithm depends on scale of
the network.

These adaptive protocols will be useful only
if the same algorithm is implemented for every
node of the network, meaning that nodes will