Multiplex communications – Channel assignment techniques – Using time slots
Reexamination Certificate
2005-12-20
2005-12-20
Pham, Brenda (Department: 2664)
Multiplex communications
Channel assignment techniques
Using time slots
C370S445000
Reexamination Certificate
active
06977944
ABSTRACT:
A technique to allow enhanced stations and legacy stations to work with each other without the inefficiencies of signaling overhead in the prior art is disclosed. An enhanced station transmits an initial, short frame using a modulation compatible with legacy stations. The frame sets the duration for a frame exchange—consisting of a data frame, followed by acknowledgement frame—in which the data frame is transmitted using an enhanced modulation format. The duration specified in the transmitted initial frame covers the time interval of the subsequent frame exchange. All stations, including legacy stations, listen in on the frame exchange and refrain subsequently from transmitting spontaneously for the time interval covered by the duration. Alternatively, the frame exchange can comprise multiple data frames with corresponding acknowledgement frames. The enhanced station can also transmit, during the remaining frame exchange, one or more intermediate frames that indicate duration.
REFERENCES:
patent: 4719620 (1988-01-01), Machino et al.
patent: 5231634 (1993-07-01), Giles et al.
patent: 5502724 (1996-03-01), Chen
patent: 5706428 (1998-01-01), Boer
patent: 5844905 (1998-12-01), McKay
patent: 5940399 (1999-08-01), Weizman
patent: 6078588 (2000-06-01), Dove et al.
patent: 6195334 (2001-02-01), Kadambi et al.
patent: 6240083 (2001-05-01), Wright
patent: 6404756 (2002-06-01), Whitehill
patent: 6469997 (2002-10-01), Dorenbosch et al.
patent: 1 178 630 (2002-02-01), None
Joa-Ng M et al: “Spread spectrum medium access protocol with collision avoidance in mobile ad-hoc wireless network” INFOCOM '99. Mar. 21, 1999, pp. 776-783, IEEE, Piscataway, NJ.
Halford S et al: “CCK-OFDM Normative Text Summary” IEEE Standard Submission, Online—Jul. 2001 pp. 1-42, <URL: http://grouper.ieee.org/groups/802/11/Documents/DocumentHolder/1-4.
Halford S et al: “OFDM as a High Rate Extension to the CCK-based 802.11b Standard” IEEE Standard Submission, Mar. 2001 pp. 1-35.
Halford S et al: “Proposed Draft Text:B+A=G High Rate Extension to the 802.11b Standard” IEEE Proposed Standard, Nov. 2001 pp. 1-68.
IEEE: “Draft Supplement to IEEE Std 802.11, 1999 Edition” IEEE Standard Draft, Jul. 2001 pp. 1-29, Retrieved from the Internet.
Brockmann Ronald A.
Hoeben Maarten
Wentink Maarten Menzo
Conexant, Inc.
Pham Brenda
Thomas Kayden Horstemeyer & Risley LLP
LandOfFree
Transmission protection for communications networks having... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmission protection for communications networks having..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission protection for communications networks having... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3474013