User terminal and radio communication method
AssigneeNtt Docomo, Inc.
InventorsYuki Matsumura, Kazuki Takeda, Satoshi Nagata
Life of this patent
Estimating the term…
Abstract
A terminal is disclosed including a processor that controls a transmission of an uplink control information using a cyclic shift that is based on the uplink control information, the uplink control information including a Hybrid Automatic Repeat reQuest-Acknowledgement (HARQ-ACK), and a transmitter that transmits the uplink control information in an uplink control channel, wherein intervals between two cyclic shifts that are respectively based on two values of a 1-bit HARQ-ACK are each equal to π, and intervals between four cyclic shifts that are respectively based on four values of a 2-bit HARQ-ACK are each equal to π/2. In other aspects, a radio communication method for a user terminal is also disclosed.
Claims5
A terminal comprising:
- a receiver that receives a configuration indicating cyclic shift candidate set indexes respectively corresponding to sets of cyclic shift candidates;
- a processor that determines a cyclic shift candidate set index from among the cyclic shift candidate set indexes based on a remainder obtained from division of a value based on a control channel element (CCE) index of a downlink control channel by a number of the cyclic shift candidate set indexes, determines a cyclic shift corresponding to an uplink control information value from among a set of cyclic shift candidates corresponding to the cyclic shift candidate set index, and generates a sequence using the cyclic shift;
- and
- a transmitter that transmits the sequence in an uplink control channel,
- wherein when the uplink control information value is one of two values of 1-bit that is 0 or 1 corresponding to NACK or ACK, an interval between two cyclic shifts of the set of cyclic shift candidates respectively corresponding to the two values is equal to π.
A radio communication method for a terminal comprising:
- receiving a configuration indicating cyclic shift candidate set indexes respectively corresponding to sets of cyclic shift candidates;
- determining a cyclic shift candidate set index from among the cyclic shift candidate set indexes based on a remainder obtained from division of a value based on a control channel element (CCE) index of a downlink control channel by a number of the cyclic shift candidate set indexes, determines a cyclic shift corresponding to an uplink control information value from among a set of the cyclic shift candidates corresponding to the cyclic shift candidate set index, and generating a sequence using the cyclic shift;
- and
- transmitting the sequence in an uplink control channel,
- wherein when the uplink control information value is one of two values of 1-bit that is 0 or 1 corresponding to NACK or ACK, an interval between two cyclic shifts of the set of cyclic shift candidates respectively corresponding to the two values is equal to π.
A system comprising:
- a terminal that comprises:
- a receiver that receives a configuration indicating cyclic shift candidate set indexes respectively corresponding to sets of cyclic shift candidates;
- a processor that determines a cyclic shift candidate set index from among the cyclic shift candidate set indexes based on a remainder obtained from division of a value based on a control channel element (CCE) index of a downlink control channel by a number of the cyclic shift candidate set indexes, determines a cyclic shift corresponding to an uplink control information value from among a set of cyclic shift candidates corresponding to the cyclic shift candidate set index, and generates a sequence using the cyclic shift;
- and
- a transmitter that transmits the sequence in an uplink control channel;
- and
- a base station that receives uplink control information, wherein when the uplink control information value is one of two values of 1-bit that is 0 or 1 corresponding to NACK or ACK, an interval between two cyclic shifts of the set of cyclic shift candidates respectively corresponding to the two values is equal to π.
Dependencies are inferred from the claim text.