David A Comstock

US Patent:

20030179727, Sep 25, 2003

Filed:

Aug 20, 2002

Appl. No.:

10/223838

Inventors:

Anthony Soong - Superior CO, US
Seong-Jun Oh - San Diego CA, US
Sanjeev Athalye - San Diego CA, US
David Comstock - San Diego CA, US

International Classification:

H04Q007/00

US Classification:

370/328000, 370/458000

Abstract:

A method and apparatus for link supervision determines whether a link signal is present or absent by measuring received energy for that signal. If the measured energy for the signal does not meet a defined energy threshold according to defined evaluation criteria, such as a sufficiency metric, the signal is deemed absent. Applied to wireless communication networks, such supervision may be used to suspend or terminate transmission responsive to detecting the link signal's absence. In an exemplary embodiment for 1×EV-DV (cdma2000 Revision C) wireless networks, a mobile station selectively performs forward link supervision based on measuring the bit energy of power control bits received by the mobile on a dedicated power control sub-channel. If a fundicated channel is assigned to the mobile station, it may perform forward link supervision based on Frame Error Rate (FER) estimations for data received on the fundicated channel rather than the energy-based approach.

US Patent:

20040166865, Aug 26, 2004

Filed:

Dec 4, 2003

Appl. No.:

10/728218

Inventors:

Anthony Soong - Superior CO, US
Thawatt Gopal - San Diego CA, US
Rath Vannithamby - San Diego CA, US
Seong-Jun Oh - San Diego CA, US
David Comstock - San Diego CA, US

International Classification:

H04Q007/20

US Classification:

455/450000

Abstract:

A call recovery method uses a multiple access forward call recovery channel to perform simultaneous rescues for multiple mobile stations. Rescue messages, such as handoff direction messages, for different mobile stations are multiplexed onto the call recovery channel for transmission to mobile stations in need of rescue.