Multiplex communications – Generalized orthogonal or special mathematical techniques – Fourier transform
Reexamination Certificate
2006-01-03
2006-01-03
Duong, Frank (Department: 2666)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Fourier transform
C370S331000, C455S436000
Reexamination Certificate
active
06982949
ABSTRACT:
A system and method for improved vertical handoff between different types of wireless network. Network allocation vector occupation and packet collision probability are used as quality of service measures, enabling vertical handoffs to be delayed until actually beneficial to quality of service. Improved wireless network cell boundary detection in vertical handoff scenarios is achieved with a Fourier-based technique in conjunction with an adaptively determined minimum operating signal strength threshold. Improved wireless network cell boundary detection enables vertical handoffs from high quality of service networks to be delayed as long as possible. Together, practical wireless network quality of service measures and improved detection of wireless network cell boundaries in vertical handoff scenarios reduce the rate of unnecessary vertical handoff resulting in higher overall quality of service experienced by a mobile computing device roaming between wireless network types.
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Guo Zihua
Yao Richard
Zhang Qian
Zhu Wenwu
Duong Frank
Leydig , Voit & Mayer, Ltd.
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