Downlink channel transmission device and method thereof
AssigneeNtt Docomo, Inc.
InventorsMamoru Sawahashi, Kenichi Higuchi, Hiroyuki Atarashi
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Abstract
A transmission device able to improve signal quality in a downlink channel is disclosed. The transmission device is for transmitting a control channel, a pilot channel, and a data channel, and includes a unit for transmitting the data channel by using a multi-beam or a variable directional beam, and a unit for transmitting a known signal as the pilot channel by using the multi-beam or the variable directional beam. The multi-beam includes plural fixed directional beams having respective fixed directions different from each other, and the variable directional beam is of a direction changing along with a position of a mobile terminal.
Claims6
A transmission device comprising:
- a generating unit that generates a transmission signal in which a data channel and a dedicated pilot channel for each mobile terminal are code-multiplexed, and the data and dedicated pilot channels and a common pilot channel common to mobile terminals within a cell are time-multiplexed;
- and
- a transmitting unit that transmits the transmission signal to a mobile terminal;
- wherein:
- a duration of the dedicated pilot channel is longer than a duration of the common pilot channel;
- the data channel is transmitted by using one of a multi-beam and a variable directional beam, said multi-beam including a plurality of fixed directional beams having respective fixed directions different from each other, said variable directional beam being of a direction changing along with a position of a mobile terminal;
- the dedicated pilot channel is transmitted by using the variable directional beam;
- and
- the common pilot channel is transmitted by using the multi-beam.
A transmission method comprising steps of:
- generating a transmission signal in which a data channel and a dedicated pilot channel for each mobile terminal are code-multiplexed, and the data and dedicated pilot channels and a common pilot channel common to mobile terminals within a cell are time-multiplexed;
- and
- transmitting the transmission signal to a mobile terminal;
- wherein
- a duration of the dedicated pilot channel is longer than a duration of the common pilot channel;
- the data channel is transmitted by using one of a multi-beam and a variable directional beam, said multi-beam including a plurality of fixed directional beams having respective fixed directions different from each other, said variable directional beam being of a direction changing along with a position of a mobile terminal;
- the dedicated pilot channel is transmitted by using the variable directional beam;
- and
- the common pilot channel is transmitted by using the multi-beam.
Dependencies are inferred from the claim text.