SATELLITE RADIO


What is Radio Network ?

A Radio Network i a collection of transmitter-receiver devices (reffered to as nodes). Each node can transmit message to other nodes that exist within its transmitting range. A node acting as a transmitter sends a message which can potentially reach all of its neighbors i.e., those are within its transmitting range. For example, in figure [1] the dotted circle lines represents the ranges of each node. Then node u can send the messages to node x, but x cannot send the message to u, where as node v and x can send the messages to each other.

Radio Network

Figure 1: Radio Network where u, v and x are devices


Why Radio Network ?

The emergence and continual growth of radio networks are being driven by the need to lower the costs associated with network infrastructures and to support wireless and mobile networking applications such as cellular telephony, radio paging, cellular data, and even elimentary multimedia services. Some radio networks operating without pre-existing infrastructure are fast deployable and self-organized. These properties make them suitable for communication in tactical operations, search and rescue missions, and home networking.

Graph representation:

A radio network can be modeled by a directed graph G=(V,E), where V denotes the set of nodes and when node node u can transmit to node v there exists an edge (u,v) in E.

Radio Network

Figure 2: Graph representation of Radio Network

Current research work:

h3>At present we are working with the following problems:
  • Broadcasting : It is one of the basic tasks in network communication. Its goal is to transmit a message from one node of the network, called source, to all other nodes. Remote nodes get the source message via intermediate nodes, along the paths in the network.
  • Dynamic radio network : A radio network is dynamic if it is possible for the nodes to enter to the network and leave from the network according to their will.