Telecommunications – Transmitter and receiver at separate stations
Patent
1994-10-16
1997-12-09
Urban, Edward F.
Telecommunications
Transmitter and receiver at separate stations
455 541, 379 60, 370 332, H04Q 722
Patent
active
056970552
ABSTRACT:
A method and system for performing an intersystem handoff of communication with a mobile station between base stations of first and second cellular systems is disclosed herein. At the mobile station, a quantifiable parameter of a signal transmitted by a second base station of the second system is measured. When the measured value of the quantifiable parameter passes through a first predetermined level, the mobile station communicates a signal quality message via a first base station of the first system to a first mobile switching control station. A channel request message is then communicated from the first mobile switching control station to a second mobile switching control station within the second system. At the second base station, a quantifiable parameter of the signal received from the mobile station is also measured. The second base station establishes communication with the mobile station when the measured value of the quantifiable parameter passes through a predetermined level. Alternately, the signal strength of a first pilot signal transmitted by the first base station is measured at the mobile station. A handoff request message is then sent to the second base station when the measured signal strength of the first pilot signal becomes less than a second predetermined level, thereby mobile station communication to be established. The provision of a voice link between the mobile switching control stations allows for the forwarding of an existing connection between the first and second cellular systems, and enables the performance of soft intersystem handoffs.
REFERENCES:
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5063591 (1991-11-01), Jodoin
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5267261 (1993-11-01), Blakeney, II et al.
patent: 5295153 (1994-03-01), Gudmundson
patent: 5594281 (1997-01-01), Kozdon et al.
patent: 5594718 (1997-01-01), Weaver, Jr. 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 Klein S.
Holcman Alejandro Raul
Karmi Gadi
Tiedemann Jr. Edward G.
English Sean
Miller Russell B.
Qualcomm Incorporated
Urban Edward F.
LandOfFree
Method and apparatus for handoff between different cellular comm 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 handoff between different cellular comm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for handoff between different cellular comm will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1617285