Riku JanttiTelecommunication Engineering at University of Vaasa,

FinlandSeong-Lyun Kim

Electrical and Electronic Engineering, Yonsei University, Seoul, Korea.

IEEE TWC, Vol. 5, No. 5, May 2006

+ Introduction+ Network model+ Iterative algorithm for maximum lifetime

routing problem+ Numerical Example+ Conclusion

+ Wireless ad hoc network– Low battery capacity– High data rate– Low interference

+ Previous works– Power control scheme works on a single link– Rate adapt scheme works on a single link

+ Carrier-to-interference

+ Function of Rate

+ Probability of transmissionφij is defined on link(i,j)

=

Bit-energy-to-interference+noise-power-density

+ Transmission Energy Allocation+ Transmission Time and Power Allocation+ Transmission Rate Allocation

For link(1,3)

Node 1:1) Transmission Energy Allocation

a. Chose a suitable power 2) Transmission Time and Power Allocation

a. Find the network life time

3) Transmission Rate Allocationa. Based on 1) and 2) to select the transmission rate

p1p4

Ps = 50mWPt = 800mWPr = 400mWW = 1 MHzΓ(p) = 5 dbm

+ Joint routing and Rate allocation – Maximizing the network life time

+ Increase transmission power– Lower interference – Higher data rate– For other nodes, the energy consumption is lower