Nanotron Technology

EBM (Energy Budget Management)

EBM (Energy Budget Management) is a methodology to determine exactly how much energy is required to transmit a quality signal to a wireless device from a base station, without wasting energy in the process. This process has been designed with wireless networks in mind, and the requirements for keeping the energy requirements low, both for cost savings and for environmental reasons.

Key Features of Energy Budget Management

• Radiates only the energy needed to communicate with a station
• Does not radiate more power than is necessary
• Energy is conserved, which means battery power can be saved
• Longer battery life means money saved, which also means better service for customers
• With the saving of energy, either:
  - Number of stations can be increase
  - Radius of communication can be increased

Energy Defined

To understand EBM, it is first important to understand that energy is the result of power and time. The amount of energy that is used is a factor of the output power of a device by the amount of time that is used to transmit a signal. In other words, Energy = P * T.

Budgeting Energy

EBM budgets the energy as follows:

1. A wireless device sends a quick pulse to the base station, which is used by the base station to determine the link quality.
2. After each device in the network sends this pulse, the Base station then knows the state of the link qualities of each device
3. The base station then sends exactly the amount of energy required for each device to receive a quality signal based on the link quality that was determined for each device.
4. As the output power of the base station stays constant, the transmission time is modified to achieve optimum transmission for each device. This is achieved in software by changing the bit rate.

EBM can be illustrated as follows:

EBM (Energy Budget Management)

Results of EBM

This results in the saving of energy per transmission, which can allow for the increase in the number of stations served within a given radius, or to increase the size of the radius in which the base station transmits quality links. Furthermore, as the devices in the network save energy, battery lifetime can be extended, thus reducing the cost of maintaining the network.