Radio communication system selectively using multicast with vari

Details Radio communication system selectively using multicast with vari Radio communication system selectively using multicast with vari

1997-03-04

1999-07-27

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via time channels

370442, 370519, 375347, 455503, 455676, H04Q 722

Patent

active

059302488

ABSTRACT:
A digital base station improves downlink coverage by allocating multicast and non-multicast channels based on the propagation property of an RF link between a mobile unit and a base station. The non-multicast channels are time slots during which information is transmitted from one antenna, and multicast channels are time slots during which information is transmitted from multiple diversity antennas. Transmission timing is offset from the diversity antennas by an amount that corresponds to the multipath propagation properties of the RF link.

REFERENCES:
patent: 5600635 (1997-02-01), Hamaki et al.
Yoshida et al., Article Delay Insertion Diversity of Extend Anti-Multipath Capability of DSK in Mobile Radio, 1986, IEEE International Conference on Communications.
L.B. Lopes, Combined Space/Time Diversity Technique for Narrowband TDMA Mobile Systems, May 19, 1989, Dept. of Electrical & Electronic Engineering, University of Leeds.
Morgensen et al., On Antenna-And Frequency Diversity in GSM Related Systems (GSM-900, DCS-18, and PCS1900), 1996, IEEE.
Morgensen, GSM Base-Station Antenna Diversity Using Soft Diversity Using Soft Decision Combining on Up-link and Delayed-Signal Transmission on Down-link, 1993, Danish Center for Personal Communication, Aalborg University, IEEE.

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