FIELD: mobile connection.
SUBSTANCE: aperiodic channel state information is reported in a flexible manner to radio base stations to be coordinated when coordinated multiple-point transmission/reception is performed. Radio base station transmits via a downlink control channel to a user terminal uplink scheduling grant containing a request field at user terminal reporting channel state information, and identification field identifying base station of plurality of radio base stations that perform coordinated multipoint transmission/reception, which is necessary to report aperiodic channel state information. User terminal evaluates channel state with respect to a radio base station designated by a combination of request field and identification field, and communicates via uplink shared channel state information to said base station.
EFFECT: improved capacity of user terminals located at edges of cells.
10 cl, 16 dwg
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Authors
Dates
2016-04-10—Published
2012-02-17—Filed