Ensuring Both Coverage and Connectivity for Wireless Sensor Networks
Study the coverage and connectivity issue from different angle
Do not rely on the assumption RC>2RS
The previous results can be regarded as special cases of what we proposed
More general decentralized solutions
Distributed protocols for
Determining the levels of coverage and connectivity
Achieve the expected levels of coverage and connectivity
Prolong the network lifetime
Main achievements and outcomes
Research or technology outcomes
As far as we know, the combination of these mechanisms has not been well studied in this field
, especially when coverage and connectivity issues are concerned. These results have been published
in ACM Trans. on Sensor Networks
Sensing Coverage for Randomly Distributed WSNs in Shadowed Environments
We have examined the impact of the shadowing effects on the sensing coverage.
Sensing coverage is an important issue for sensor networks, and is viewed as one of
the critical measures of the performance offered by a sensor network. The analytical
results of the sensing coverage, for a large-scale randomly distributed sensor network
in shadowed environments, are provided. It was found that the increase in standard
deviation of the shadowing effects severely degrades the sensing coverage. For an
increase of 2dB in the standard deviation, the sensing coverage degrades by about 10%.
Main achievements and outcomes
Research or technology outcomes
These proposed protocols can significant improve network sensing
coverage and network lifetime of WSNs. This work has been presented at IEEE Globecom 2006
and published in IEEE Trans. on Wireless Communications.
A Coverage - preserving Routing Algorithm for WSNs
We have proposed coverage-preserving routing protocols to enhance network sensing
coverage. Different routing protocols may motivate different distributions of energy
dissipation among nodes. This implies that different routing protocols will lead to different
sensing coverage when some nodes are no longer available. According to the simulation
results, the performance of sensing coverage can be substantially improved. A gain of
20% in sensing coverage can be obtained in the middle phase by using the proposed protocols.
Main achievements and outcomes
Research or technology outcomes
These proposed protocols can significant improve network
sensing coverage and network lifetime of WSNs. This work has been presented at
IEEE Globecom 2006 and published in IEEE Trans. on Wireless Communications
