Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2004-04-28
2008-08-26
Vo, Don N (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
07418044
ABSTRACT:
There is disclosed a multicast transmission system in which an efficient and highly reliable multicast transmission can be performed. In the multicast transmission system for performing multicast transmission to a plurality of terminal stations from a base station, when an error is detected in the terminal station, the terminal station utilizes some of sub-carriers constituting an OFDM symbol to generate and transmit a NAK signal to the base station. A level judgment section25in the base station resends a packet to each terminal station when a reception signal level exceeds a threshold. Since the number M of sub-carriers able to be utilized to generate the NAK signal and the number L of sub-carriers necessary for generating the NAK signal are determined base on the number of terminal stations, packet communication quality, and the like, an erroneous detection probability and detection miss probability of the NAK signal can both be lowered.
REFERENCES:
patent: 5517507 (1996-05-01), Needham et al.
patent: 5577024 (1996-11-01), Malkamaki et al.
patent: 5754946 (1998-05-01), Cameron et al.
patent: 6587672 (2003-07-01), Chuah et al.
patent: 6597668 (2003-07-01), Schafer et al.
patent: 6735256 (2004-05-01), Toshimitsu
patent: 2003/0012195 (2003-01-01), Ohkubo et al.
patent: 0 802 696 (1997-10-01), None
Y. Yamauchi, IEEE VTC' 90, pp. 366 to 371, “Reliable Multicast Over the Mobile Packet Radio Channel”, 1990.
H. Rohling et al., Vehicular Technology Conference Mobile Technology for the Human Race, XP-010162661, pp. 1589-1593, “Performance of an OFDM-TDMA Mobile Communication System”, Apr. 28, 1996.
T. Kumagai et al., Personal, Indoor and Mobile Radio Communications, XP-010314535, ;gs. 528-532, “A Maximal Ratio Combining Frequency Diversity ARQ Scheme for OFDM Signals”, Sep. 8, 1998.
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vo Don N
LandOfFree
Radio communication system, radio communication 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 Radio communication system, radio communication method,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio communication system, radio communication method,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4005960