Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-05-23
1998-12-08
Patel, Ajit
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
455436, H04Q 700
Patent
active
058480633
ABSTRACT:
In a communications network, a network user communicates through a remote unit with another user via at least one base station. The communications network includes a first mobile switching center which controls communications through a first set of base stations including a first base station. The remote unit stores a list of active base stations which has an entry corresponding to each base station with which active communication is established. The first base station has an entry on the list of active base stations. The first base station measures a round trip delay of an active communication signal between the first base station and the remote unit. A handoff of the active communication signal is initiated if the round trip delay of the active communication exceeds a threshold if the first base station is designated as a reference base station. Alternatively, the remote unit also stores a list of candidate base stations comprising an entry corresponding to each base station through which active communication may be possible but is not established. A handoff of the active communication signal is initiated if the list of candidate base stations comprises an entry corresponding to a triggering pilot signal.
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: 5164958 (1992-11-01), Omura
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: 5327575 (1994-07-01), Menich et al.
patent: 5341397 (1994-08-01), Gudmundson
patent: 5367533 (1994-11-01), Schilling
patent: 5379447 (1995-01-01), Bonta et al.
patent: 5412658 (1995-05-01), Arnold et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5432843 (1995-07-01), Bonta et al.
patent: 5438565 (1995-08-01), Hemmady et al.
patent: 5448754 (1995-09-01), Ho et al.
patent: 5577022 (1996-11-01), Padovani et al.
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 "Alternative Methods For Inter-Channel Handoff" by Charles E. Wheatley, III of Qualcomm Incorporated presented on Nov. 10-20, 1992 in Atlanta, Georgia, pp. 1-3.
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 Document entitled "Intersystem Operation With the Proposed Wideband Spread Spectrum Dual-Mode Mobile Station-Base Station Compatibility Standard" by Gadi Karmi et al. of Qualcomm Incorporated, presented May 18, 1992 in Atlanta, Georgia, pp, 1-37.
TIA/EIA Telecommunications Systems Bulletin entitled "Cellular Radiotelecommunications Intersystem Operations: Authentication, Signaling Message Encryption and Voice Privacy", May 1993, 9 pages.
EIA/TIA interim Standard entitled "Cellular Radiotelecommunications Intersystem Operations: Intersystem Handoff", Dec. 1991, 18 pages.
TIA/EIA Telecommunications Systems Bulletin entitled "IS-41-B Mobile Border System Problems", Apr. 1994, 26 pages.
TIA/EIA Telecommunications Systems Bulletin entitled "IS-41-B Support for Dual Mode Wideband Spread Spectrum Mobile Stations", Jan. 1994, 14 pages.
TIA Document entitled "Soft Handoff Frame Format" by Edward G. Tiedemann, Jr. of Qualcomm Incorporated presented Dec. 11-14, 1995 in Dallas, Texas, pages 1-7.
Klein S. Gilhousen et al, "Increased Capacity Using CDMA for Mobile Stellite Communication", IEEE Journal On Selected Areas In Communications, vol. 8, No. 4, May 1990, pp. 503-514.
TIA Document entitled "CDMA Intersystem Operations" by Alejandro Holcman et al. of Qualcomm Incorporated, Presented at IEEE Conference on Vehicular Technology Committee in Stockholm, Sweden on Jun. 98, 1994, 5 pages.
TIA TR45.2 Intersystems Operations Presentation entitled "The Wideband Spread Spectrum Standard Under Development in TR45.5" by Edward G. Tiedemann, Jr. of Qualcomm Incorporated, Presented in Atlanta, Georgia, Nov. 16-20, 1992, 9 pages.
Gilhousen Klein S.
Karmi Gadi
Munsinger David B.
Padovani Roberto
Weaver, Jr. Lindsay A.
Greenhaus Bruce W.
Miller Russell B.
Patel Ajit
Qualcomm Incorporated
LandOfFree
Method and apparatus for hard handoff in a CDMA system 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 hard handoff in a CDMA system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for hard handoff in a CDMA system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-185817