Spread spectrum cellular handoff method

Details Spread spectrum cellular handoff method Spread spectrum cellular handoff method

1991-07-19

1992-11-17

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04R 102

Patent

active

051649586

ABSTRACT:
A method for handling off a transitioning-remote unit from a first microcell having a first base station communicating with a first plurality of remote units, to a second microcell having a second base station communicating with a second plurality of remote units. The first base station communicates to the first plurality of remote units using synchronous, code division multiple access at a first carrier frequency and a first power level. The second base station communicates simultaneously to the second plurality of remote units using synchronous, code division multiple access at a second carrier frequency and a second power level. The second power level is typically greater than the first power level. While the transitioning-remote unit transitions from first microcell to the second microcell, the second base station detects a power level of the remote-communications signal, exceeding a predetermined threshold, transmitted from the transitioning-mobile unit. The second base station signals to the first base station and to the transitioning-remote unit, to transfer the transitioning-remote unit to the second carrier frequency and a new chip codeword for communicating with the second base station. The transitioning-remote unit accesses using an access protocol, the second base station, and communicates from the transitioning-remote unit to the second base station using the new chip codeword, and direct sequence spread spectrum modulation at the second carrier frequency.

REFERENCES:
patent: 4112372 (1978-09-01), Holmes et al.
patent: 4455651 (1984-06-01), Baran
patent: 4471164 (1984-09-01), Henry
patent: 4479226 (1984-10-01), Prabhu et al.
patent: 4512013 (1985-04-01), Nash et al.
patent: 4523311 (1985-06-01), Lee et al.
patent: 4553130 (1985-11-01), Kato
patent: 4563774 (1986-01-01), Gloge
patent: 4606039 (1986-08-01), Nicolas et al.
patent: 4612637 (1986-09-01), Davis et al.
patent: 4621365 (1986-11-01), Chiu
patent: 4653069 (1987-03-01), Roeder
patent: 4660164 (1987-04-01), Leibowitz
patent: 4672605 (1987-06-01), Hustig et al.
patent: 4672629 (1987-06-01), Beier
patent: 4672658 (1987-06-01), Kavehrad et al.
patent: 4675839 (1987-06-01), Kerr
patent: 4680785 (1987-07-01), Akiyama et al.
patent: 4691326 (1987-09-01), Tsuchiya
patent: 4697260 (1987-09-01), Gravel et al.
patent: 4703474 (1987-10-01), Foschini et al.
patent: 4707839 (1987-11-01), Adren et al.
patent: 4718080 (1988-01-01), Serrgno et al.
patent: 4730340 (1988-03-01), Frazier, Jr.
patent: 4742512 (1988-05-01), Akashi et al.
patent: 4757495 (1988-07-01), Recker et al.
patent: 4759034 (1988-07-01), Nagazumi
patent: 4789983 (1988-12-01), Acampora et al.
patent: 4799253 (1989-01-01), Stern et al.
patent: 4843350 (1989-06-01), Nazarathy et al.
patent: 4843586 (1989-06-01), Nazarathy et al.
patent: 4850036 (1989-07-01), Smith
patent: 4914651 (1990-04-01), Lusignan
patent: 4922506 (1990-05-01), McCallister et al.
patent: 4930140 (1990-05-01), Cripps et al.
patent: 4932037 (1990-06-01), Simpson et al.
patent: 4969159 (1990-11-01), Belcher et al.
patent: 4977577 (1990-12-01), Arthur et al.
patent: 4977578 (1990-12-01), Ishigaki et al.
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 5005169 (1991-04-01), Browder et al.
patent: 5016255 (1991-05-01), Dixon et al.
patent: 5016256 (1991-05-01), Stewart
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5023887 (1991-06-01), Takeuchi et al.
patent: 5029181 (1991-07-01), Endo et al.
patent: 5040238 (1991-08-01), Comroe et al.
patent: 5048052 (1991-09-01), Hamatsu et al.
patent: 5056109 (1991-10-01), Gilhousen et al.
M. K. Simon, J. K. Omura, R. A. Scholtz & B. K. Levitt, Spread Spectrum Communications, vol. 1, pp. 1-39, Rockville, Md.: Computer Science Press, 1985.
M. K. Simon, J. K. Omura, R. A. Scholtz & B. K. Levitt, Spread Spectrum Communications, vol. 3, pp. 346-407, Rockville, Md.: Computer Science Press, 1985.
R. A. Scholtz, "The Origins of Spread-Spectrum Communications", IEEE Trans. Commun., Com-30, No. 5, pp. 822-854, May 1982.
R. L. Pickholtz, D. L. Schilling & L. B. Milstein, "Theory of Spread-Spectrum Communications-A Tutorial", IEEE Trans. Commun., COM-30, No. 5, pp. 855-884, May 1982.
R. A. Scholtz, "Notes on Spread-Spectrum History", IEEE Trans. Commun., COM-31, No. 1, pp. 82-84, Jan. 1983.
R. Price, "Further Notes and Anecdotes on Spread-Spectrum Origins", IEEE Trans. Commun., COM-31, No. 1, pp. 85-97, Jan. 1983.
M. Kavehrad, "Performance of Nondiversity Receivers for Spread Spectrum in Indoor Wireless Communications", AT&T Technical J., vol. 64, No. 6, pp. 1181-1210, Jul.-Aug. 1985.
M. Kavehrad and D. J. McLane, "Spread Spectrum for Indoor Digital Radio", IEEE Commun. Mag., vol. 25, No. 6, pp. 32-40, Jun. 1987.
M. Kavehrad and G. E. Bodeep, "Design and Experimental Results for a Direct-Sequence Spread-Spectrum Radio Using Differential Phase-Shift Keying Modulation for Indoor, Wireless Communications", IEEE Trans. Commun., SAC-5, No. 5, pp. 815-823, Jun. 1987.

Affiliated with

Also associated with

Rating

Spread spectrum cellular handoff method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spread spectrum cellular handoff method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum cellular handoff method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1177549