channel interference issues
Quality of service
channel allocation
security issues
elimination or reduction of the influence of man-made noise, particularly at lower RF frequencies.
Spectrum allocation, Low complexity hardware design, Power management, security issues etc.,
I can recommend the keynote from this year's S3 student workshop by Kyle Jamieson, "Should I Work on Wireless Networks." There are some recent challenges for mobile wireless networks inside and good advice.
http://www0.cs.ucl.ac.uk/staff/k.jamieson/S3%202012%20Keynote.pdf
Some of the latest areas in wireless are cognitive radios, cooperative communications, network coding
Networking-Finding the Feasible minimal path between Transmitting and Receiving Nodes in Minimum time,Vertical Handover,a combination of the two to decide where to handover to the other provider are a few of the challenging tasks.
P.S.
bro i suggest you to see this link if you could do some thing of this behaviour
http://www.ijera.com/papers/Vol2_issue4/KC2417271732.pdf
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