Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1995-03-30
1997-01-14
Marcelo, Melvin
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
375200, 375206, 379 59, 379 60, 455 331, 455 332, 455 541, 370335, 380 34, H04L 2730
Patent
active
055947182
ABSTRACT:
A method and system for providing a reliable means to perform handoff from a code division multiple access (CDMA) system using a pilot signal to an alternative access communication technique system. Simple pilot box circuitry is added to a set of border base stations. The border base stations are base stations which operate only in the alternative access communication technique and which have coverage areas which are contiguous with coverage areas of CDMA operation base stations. The mobile unit monitors for the pilot signal from the border base stations in the same manner as it monitors for pilot signals from the CDMA operation base stations. When the mobile unit detects the pilot signal corresponding to a border base station, it notifies a system controller in accordance with standard operation. The system controller is aware that the pilot signal corresponds to a border base station and thus triggers a hard handoff process to the alternative access communication technique system in response thereto.
REFERENCES:
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5184347 (1993-02-01), Farwell et al.
patent: 5267261 (1993-11-01), Blakeney, II et al.
patent: 5267262 (1993-11-01), Wheatley, III
patent: 5278892 (1994-01-01), Bolliger et al.
patent: 5295153 (1994-03-01), Gudmundson
patent: 5305308 (1994-04-01), English et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5438565 (1995-08-01), Hemmady et al.
TIA document "CDMA Intersystem Operations" by Alejandro Holcman et al. Presented at IEEE Conference on Vehicular Technology Committee, Stockholm, Sweden, Jun. 8, 1994.
TIA TR45.2 Intersystems Operations Presentation "The Wideband Spread Spectrum Standard Under Development in TR45.5" by Edward G. Tiedemann, presented in Atlanta, GA, Nov. 16-20, 1992.
TIA document "Intersystem Operation With The Proposed Wideband Spread Spectrum Dual-Mode Mobile Station-Base Station Compatibility Standard" by Gadi Karmi et al, presented May 18, 1992 in Atlanta, GA, pp. 1-37.
TIA Document entitled "Alternative methods for Inter-Channel Handoff" by Charles Wheatley of QUALCOMM Incorporated, presented on Nov. 10-20, 1992 in Atlanta, Georgia, pp. 1-3.
TIA document entitled "Proposed Draft Liaison Statement to TR45.2" by Edward G. Tiedemann, Jr. of QUALCOMM Incorporated presented Dec. 3-11, 1992 in Phoenix, Arizona, pp. 1-32.
TIA Document entitled "Intersystem issues for Support of the Wideband Spread-Spectrum Digital Standard" by Gadi Karmi of QUALCOMM Incorporated presented Oct. 6, 1992 in Boston, Massachusetts, pp. 1-7.
TIA/EIA Telecommunications Systems Bulletin entitled "Cellular Radiotelecommunications Intersystem Operations: Authentication, Signaling Message Encryption and Voice Privacy", May 1993.
EIA/TIA Interim Standard entitled "Cellular Radiotelecommunications Intersystem Operations: Intersystem Handoff", Dec. 1991.
TIA/EIA Telecommunications Systems Bulletin entitled "IS-41-B Mobile Border System Problems", Apr. 1994.
TIA/EIA Telecommunications Systems Bulletin entitled "IS-41-B Support for Dual Mode Wideband Spread Spectrum Mobile Stations", Jan. 1994.
Gilhousen, K., Jacobs, I., Padovani, R., and Weaver Jr., L. "Increased Capacity Using CDMA for Mobile Satellite Communication", IEEE Journal on Selected Areas in Communications, vol. 8, No. 4, May 1990.
Bayley Gwain
Gilhousen Klein S.
Tiedemann Jr. Edward G.
Weaver, Jr. Lindsay A.
Carman Melissa Kay
Marcelo Melvin
Miller Russell B.
Qualcomm Incorporated
White Katherine W.
LandOfFree
Method and apparatus for providing mobile unit assisted hard han does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for providing mobile unit assisted hard han, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for providing mobile unit assisted hard han will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1394038