Title:
TRANSMISSION PROTECTION FOR COMMUNICATIONS NETWORKS HAVING STATIONS OPERATING WITH DIFFERENT MODULATION FORMATS
Document Type and Number:
WIPO Patent Application WO2003061196
Kind Code:
A3
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.
Inventors:
BROCKMANN RONALD A
HOEBEN MAARTEN
WENTINK MAARTEN MENZO
HOEBEN MAARTEN
WENTINK MAARTEN MENZO
Application Number:
PCT/US2003/000644
Publication Date:
April 01, 2004
Filing Date:
January 09, 2003
Export Citation:
Assignee:
INTERSIL INC (US)
International Classes:
H04L5/14; H04L12/28; H04L12/56; (IPC1-7): H04L12/28
Foreign References:
| EP1178630A1 | 2002-02-06 |
Other References:
JOA-NG M ET AL: "Spread spectrum medium access protocol with collision avoidance in mobile ad-hoc wireless network", INFOCOM '99. EIGHTEENTH ANNUAL JOINT CONFERENCE OF THE IEEE COMPUTER AND COMMUNICATIONS SOCIETIES. PROCEEDINGS. IEEE NEW YORK, NY, USA 21-25 MARCH 1999, PISCATAWAY, NJ, USA,IEEE, US, 21 March 1999 (1999-03-21), pages 776 - 783, XP010323843, ISBN: 0-7803-5417-6
HALFORD S ET AL: "CCK-OFDM Normative Text Summary", IEEE STANDARD SUBMISSION, - July 2001 (2001-07-01), pages 1 - 42, XP002240125, Retrieved from the Internet [retrieved on 20030502]
HALFORD S ET AL: "OFDM as a High Rate Extension to the CCK-based 802.11b Standard", IEEE STANDARD SUBMISSION, - March 2001 (2001-03-01), pages 1 - 35, XP002240126, Retrieved from the Internet [retrieved on 20030502]
HALFORD S ET AL: "Proposed Draft Text: B+A=G High Rate Extension to the 802.11b Standard", IEEE PROPOSED STANDARD, - November 2001 (2001-11-01), pages 1 - 68, XP002240127, Retrieved from the Internet [retrieved on 20030502]
IEEE: "Draft Supplement to IEEE Std 802.11, 1999 Edition", IEEE STANDARD DRAFT, - July 2001 (2001-07-01), pages 1 - 29, XP002240128, Retrieved from the Internet [retrieved on 20030505]
HALFORD S ET AL: "CCK-OFDM Normative Text Summary", IEEE STANDARD SUBMISSION, - July 2001 (2001-07-01), pages 1 - 42, XP002240125, Retrieved from the Internet
HALFORD S ET AL: "OFDM as a High Rate Extension to the CCK-based 802.11b Standard", IEEE STANDARD SUBMISSION, - March 2001 (2001-03-01), pages 1 - 35, XP002240126, Retrieved from the Internet
HALFORD S ET AL: "Proposed Draft Text: B+A=G High Rate Extension to the 802.11b Standard", IEEE PROPOSED STANDARD, - November 2001 (2001-11-01), pages 1 - 68, XP002240127, Retrieved from the Internet
IEEE: "Draft Supplement to IEEE Std 802.11, 1999 Edition", IEEE STANDARD DRAFT, - July 2001 (2001-07-01), pages 1 - 29, XP002240128, Retrieved from the Internet
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