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Terminal Battery based handover.

The Idea aims to save the battery power

of the mobile terminal through scanning a

reduced number of wireless networks for

a low battery mobile terminal involved inNetwork discovery and by guaranteeing

handover to a network which will

consume less amount of power. The

suggestion also aims to exploit clustering

in which mobile terminals in the same

geographical location are grouped into a

cluster to further reduce the number of

Discovery attempts by a mobile terminal.

The algorithm assumes that the serverhosts a table of the power consumption

rates of the various access technologies

under the coverage of the base station

hence calling for each base station to have

its central server to control handover in

its coverage area. One way in which the

server is able to know the wireless

networks under its control is through the

reports from the previous

scans/discoveries performed by the

mobile terminals. For every discovery

conducted, the server updates the power

consumption rate table to include new

wireless networks discovered if any

otherwise it maintains the hold table and

assumes those are the only available

networks.

The mobile terminals exchange

information regarding their location and

the battery level status with a central

server. When a mobile terminal wants to

perform handover mechanism, a

handover request is sent to the server

together with the battery status

information and the server assesses the

battery level of the terminal and maps it

to the power consumption rates of the

various available wireless technologies. In

case the required information is available

at the server end, the server forwards the

information to the requesting terminal

instructing it to handover to a wireless

network that will match its battery level.

In case there is no information on the

server end, after mapping the terminal

battery level with the consumption rates

of the different access technologies, the

server will instruct the requesting

terminals to scan only networks whosepower consumption rate is below a given

threshold that will not drain the battery

of the terminal before end of data

transmission. The mobile terminal will

not attempt to discover wireless

networks whose power consumption

cannot be met by the battery level of the

mobile terminal. As the mobile terminal

power decreases further, it means the

number of networks that the terminal can

hand over to decreases hence the scanned

networks also decrease hence enabling a

low power mobile terminal to spend less

energy in network discovery. This power

based selective scanning ensures that the

mobile terminal hands over to a network

with low power consumption and also

decreases the number of scanned

Networks hence increasing terminal

battery life time. The discovery attempts

are further reduced by clustering

approach in which nodes of the same

cluster can share the handover

information.

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Handover triggering

Handover can be triggered based on a

number of factors one of them being the

power consumption rate of the current

serving Wireless network. We assume themobile terminal knows its battery level

and the quantity of incoming or outgoing

traffic from which it can compute the time

it will take for it to complete the

information exchange. Basing on the

power consumption rate of the current

network, the mobile terminal then

assesses if it will be able to complete the

data transmission or reception with itscurrent battery level or not. In case it

discovers that its battery will be drained

before completion, it then triggers

handover otherwise it stays on the

current network.

The other option of handover triggering

would be just considering thresholds on

power consumption irrespective of the

incoming traffic. In this case, handover istriggered if the power consumption of the

current network goes above a given

threshold.