| US 7,532,578 B2 | ||
| Communication system, communication method and mobile station | ||
| Akihito Hanaki, Yokohama (Japan); Minami Ishii, Yokohama (Japan); Sung Uk Moon, Yokosuka (Japan); Takehiro Nakamura, Yokosuka (Japan); Masafumi Usuda, Yokosuka (Japan); and Mayu Yamada, Yokosuka (Japan) | ||
| Assigned to NTT DoCoMo, Inc., Tokyo (Japan) | ||
| Filed on Dec. 08, 2003, as Appl. No. 10/728,981. | ||
| Claims priority of application No. 2002-355799 (JP), filed on Dec. 06, 2002. | ||
| Prior Publication US 2004/0160955 A1, Aug. 19, 2004 | ||
| Int. Cl. H04L 12/26 (2006.01); H04L 12/56 (2006.01) | ||
| U.S. Cl. 370—252 [370/390] | 10 Claims |
| 1. A communication system for transmitting multicast data to a plurality of mobile stations joining in a multicast group,
the system comprising:
a category manager configured to store a reception capability value showing a reception capability necessary for receiving
multicast data in each of the mobile stations and a category corresponding to the reception capability;
a reception capability collector configured to collect reception capability values of each of the mobile stations regardless
of whether each of the mobile stations receives the multicast data, prior to transmission of the multicast data, wherein the
reception capability value of each of the mobile stations is defined by at least one of a demodulation method, a reception
buffer size, a processing capability, a decoding method, a interleaving length, a number of despreaders and a number of decoders;
a transmitter configured to transmit the multicast data using a transmission method corresponding to a first category and
a transmission method corresponding to a second category, when both a reception capability value corresponding to the first
category and a reception capability value corresponding to the second category are collected by the reception capability collector.
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