Multiplex communications – Duplex – Communication over free space
Patent
1995-06-05
1999-09-28
Safourek, Benedict V.
Multiplex communications
Duplex
Communication over free space
370507, 375358, H04B 156
Patent
active
059599804
ABSTRACT:
A system and method for time division duplex communication over a single frequency band wherein guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided into a plurality of time slots, during each of which the base station transmits to a user station and the user station transmits to the base station. Communication is initiated by a round trip timing transaction. In response to a general polling message from the base station, a user station seeking to establish communication transmits a short reply message. The base station calculates the distance of the user station by measuring the propagation delay with respect to receipt of the reply message. The base station sends a timing adjustment command to the user station instructing the user station to advance or retard its timing according to the calculated distance, so as to minimize guard times between time slots. Thereafter, the base station monitors the user station transmissions and periodically commands the user station to advance or retard its timing in a like manner. The user station may transmit a control preamble at the start of each time slot to allow the base station to perform round trip timing calculations, and/or to allow adjustment of user station power or antenna selection.
REFERENCES:
patent: 3838221 (1974-09-01), Schmidt et al.
patent: 4189677 (1980-02-01), Cooper et al.
patent: 4217563 (1980-08-01), Vale
patent: 4222115 (1980-09-01), Cooper et al.
patent: 4291410 (1981-09-01), Caples
patent: 4301530 (1981-11-01), Gutleber
patent: 4324001 (1982-04-01), Rhodes
patent: 4355411 (1982-10-01), Reudink et al.
patent: 4418393 (1983-11-01), Zachiele
patent: 4432089 (1984-02-01), Wurzburg et al.
patent: 4481640 (1984-11-01), Chow et al.
patent: 4484028 (1984-11-01), Kelley et al.
patent: 4494211 (1985-01-01), Schwartz
patent: 4506372 (1985-03-01), Massey
patent: 4513416 (1985-04-01), Fujiwara
patent: 4525835 (1985-07-01), Vance et al.
patent: 4587662 (1986-05-01), Langewellpott
patent: 4612637 (1986-09-01), Davis et al.
patent: 4621365 (1986-11-01), Chiu
patent: 4672658 (1987-06-01), Kavehrad et al.
patent: 4675863 (1987-06-01), Paneth et al.
patent: 4688210 (1987-08-01), Eizenhofer et al.
patent: 4696051 (1987-09-01), Breeden
patent: 4701904 (1987-10-01), Darcie
patent: 4703474 (1987-10-01), Foschini et al.
patent: 4724435 (1988-02-01), Moses et al.
patent: 4736371 (1988-04-01), Tejima et al.
patent: 4742512 (1988-05-01), Akashi et al.
patent: 4754453 (1988-06-01), Eizenhofer
patent: 4765753 (1988-08-01), Schmidt
patent: 4797947 (1989-01-01), MacDoran et al.
patent: 4807222 (1989-02-01), Amitay
patent: 4817089 (1989-03-01), Paneth et al.
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 4905221 (1990-02-01), Ichiyoshi
patent: 4912705 (1990-03-01), Paneth et al.
patent: 4953197 (1990-08-01), Kaewell
patent: 4979170 (1990-12-01), Gilhousen et al.
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 4995083 (1991-02-01), Baker et al.
patent: 5016255 (1991-05-01), Dixon et al.
patent: 5018165 (1991-05-01), Sohner et al.
patent: 5022024 (1991-06-01), Paneth et al.
patent: 5022046 (1991-06-01), Morrow
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5025452 (1991-06-01), Sohner et al.
patent: 5029184 (1991-07-01), Andren et al.
patent: 5042050 (1991-08-01), Owen
patent: 5042082 (1991-08-01), Dahlin
patent: 5056109 (1991-10-01), Gilhousen et al.
patent: 5073900 (1991-12-01), Mallinkdrodt
patent: 5093840 (1992-03-01), Schilling
patent: 5097484 (1992-03-01), Akaiwa
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5107225 (1992-04-01), Wheatley et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5109393 (1992-04-01), Saegusa
patent: 5111535 (1992-05-01), Tokunaga
patent: 5117423 (1992-05-01), Shepherd et al.
patent: 5119375 (1992-06-01), Paneth et al.
patent: 5121391 (1992-06-01), Paneth et al.
patent: 5166929 (1992-11-01), Lo
patent: 5170412 (1992-12-01), Massey
patent: 5177765 (1993-01-01), Holland et al.
patent: 5177766 (1993-01-01), Holland et al.
patent: 5200956 (1993-04-01), Pudney et al.
patent: 5210771 (1993-05-01), Schaeffer et al.
patent: 5257283 (1993-10-01), Gilhousen et al.
patent: 5263045 (1993-11-01), Schilling
patent: 5263047 (1993-11-01), Kotzin et al.
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5267262 (1993-11-01), Wheatley
patent: 5274665 (1993-12-01), Schilling
patent: 5278835 (1994-01-01), Ito et al.
patent: 5289497 (1994-02-01), Jacobson et al.
patent: 5291516 (1994-03-01), Dixon et al.
patent: 5299198 (1994-03-01), Kay et al.
patent: 5303287 (1994-04-01), Laborde
patent: 5353303 (1994-10-01), Walthall
patent: 5363368 (1994-11-01), Vatt et al.
patent: 5363373 (1994-11-01), Nakahara et al.
patent: 5383219 (1995-01-01), Wheatley et al.
patent: 5398247 (1995-03-01), Delprat et al.
patent: 5402413 (1995-03-01), Dixon et al.
patent: 5410568 (1995-04-01), Schilling
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5420851 (1995-05-01), Seshadri et al.
patent: 5430760 (1995-07-01), Dent
patent: 5434859 (1995-07-01), Levardon
patent: 5444696 (1995-08-01), Petranovich
patent: 5446727 (1995-08-01), Bruckert et al.
patent: 5454028 (1995-09-01), Hara et al.
patent: 5455822 (1995-10-01), Dixon et al.
patent: 5481533 (1996-01-01), Honig et al.
patent: 5483676 (1996-01-01), Mahany et al.
patent: 5506837 (1996-04-01), Sollner et al.
patent: 5528597 (1996-06-01), Gerszberg et al.
Omnipoint Corporation
Safourek Benedict V.
LandOfFree
Timing adjustment control for efficient time division duplex com does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Timing adjustment control for efficient time division duplex com, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Timing adjustment control for efficient time division duplex com will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-711904