Reference signal transmission method, mobile station apparatus and base station apparatus
AssigneeNtt Docomo, Inc.
InventorsYoshihisa Kishiyama, Teruo Kawamura, Daisuke Nishikawa
Life of this patent
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Abstract
To efficiently use radio resources used in transmission of SRS, a base station apparatus (eNode B) transmits a scheduling grant including an instruction for transmission of a Sounding Reference Signal (SRS), and a mobile station apparatus (UE) transmits the SRS in response to the scheduling grant. The SRS is transmitted in the same subframe, another subframe or a previous subframe by the predetermined number of subframes as, immediately before, or before a subframe of a PUSCH (Physical Uplink Shared Channel) that the scheduling grant instructs to transmit.
Claims11
A reference signal transmission method comprising:
- transmitting an uplink scheduling grant including an instruction for transmission of a Sounding Reference Signal (SRS), from a base station apparatus;
- and
- transmitting the SRS from a mobile station apparatus, in response to the instruction for transmission of the SRS included in the uplink scheduling grant,
- wherein the mobile station apparatus transmits the SRS, in a subframe of the Physical Uplink Shared Channel (PUSCH) which the uplink scheduling grant instructs to transmit or in a first SRS-transmittable subframe among later subframes by a predetermined number of subframes after the subframe of the PUSCH.
A mobile station apparatus comprising:
- a reception section configured to receive an uplink scheduling grant including an instruction for transmission of a Sounding Reference Signal (SRS) from a base station apparatus;
- a transmission section configured to transmit the SRS in a subframe of a Physical Uplink Shared Channel (PUSCH) that the uplink scheduling grant instructs to transmit or in a first SRS-transmittable subframe among later subframes by a predetermined number of subframes after the subframe of the PUSCH.
A base station apparatus comprising:
- a transmission section configured to transmit an uplink scheduling grant including an instruction for transmission of a Sounding Reference Signal (SRS) to a mobile station apparatus;
- and
- a reception section configured to receive the SRS transmitted from the mobile station apparatus in response to the instruction for transmission,
- wherein the SRS is transmitted from the mobile station apparatus in a subframe of a Physical Uplink Shared Channel (PUSCH) that the uplink scheduling grant instructs to transmit or in a first SRS-transmittable subframe among later subframes by a predetermined number of subframes after the subframe of the PUSCH.
A radio communication system comprising:
- a base station apparatus having:
- a transmission section configured to transmit an uplink scheduling grant including an instruction for transmission of a Sounding Reference Signal (SRS);
- and
- a reception section configured to receive the SRS transmitted from a mobile station apparatus in response to the instruction for transmission;
- and
- the mobile station apparatus having:
- a reception section configured to receive the uplink scheduling grant from the base station apparatus;
- and
- a transmission section configured to transmit the SRS in a subframe of a Physical Uplink Shared Channel (PUSCH) that the uplink scheduling grant instructs to transmit or in a first SRS-transmittable subframe among later subframes by a predetermined number of subframes after the subframe of the PUSCH.
Dependencies are inferred from the claim text.