Apparatus and method for transmission of uplink sounding reference signals in a wireless network
AssigneeSamsung Electronics Co., Ltd.
InventorsYoung-Han Nam, Jianzhong Zhang
Life of this patent
Estimating the term…
Abstract
A mobile station for use in a wireless network that operates according to the Long-Term Evolution Advanced (LTE-A) standard is configured to transmit an aperiodic sounding reference signal (SRS) to a base station in response to a triggering grant received from the base station. The bandwidth on which the mobile station transmits the aperiodic SRS depends on a type of the triggering grant. The type of the triggering grant is one of a downlink grant, an uplink multiple-input, multiple-output (MIMO) grant, and an uplink single-input, multiple-output (SIMO) grant.
Claims16
A method of a terminal for a communication system, the method comprising:
- identifying a sounding reference signal (SRS) transmit power by power scaling based on a scaling factor if a total transmit power of a symbol for an SRS exceeds a user equipment (UE) maximum transmit power;
- when the SRS is transmitted on at least two component carriers, scaling transmit power of the SRS on each of the at least two component carriers based on following equation:
- ∑
- c
-
-
- w
- c
-
- P
- SRS
- ,
- c
-
- (
- i
- )
- ≤
- P
- CMAX
- where PCMAX is the UE maximum transmit power, wc is a scaling factor, and PSRS,c is the transmit power of the SRS on a component carrier c of the at least two component carriers;
- identifying an SRS bandwidth based on a grant which triggers the SRS;
- and
- transmitting the SRS based on the identified SRS transmit power and SRS bandwidth.
A method of a base station for a communication system, the method comprising:
- transmitting a grant which triggers a sounding reference signal (SRS);
- receiving the SRS based on an SRS transmit power and an SRS bandwidth,
- wherein the SRS transmit power is identified by power scaling based on a scaling factor if a total transmit power of a symbol for the SRS exceeds a user equipment (UE) maximum transmit power,
- wherein the SRS bandwidth is identified based on the grant, and
- wherein, when the SRS is received on the at least two component carriers, the transmit power of the SRS on each of the at least two component carriers is scaled based on following equation:
- ∑
- c
-
-
- w
- c
-
- P
- SRS
- ,
- c
-
- (
- i
- )
- ≤
- P
- CMAX
- where PCMAX is the UE maximum transmit power, wc is the scaling factor, and PSRS,c is a transmit power of the SRS on a component carrier c of the at least two component carriers.
A terminal for a communication system, the terminal comprising:
- a transmitter;
- and
- processing circuitry configured to
- identify a sounding reference signal (SRS) transmit power by power scaling based on a scaling factor if a total transmit power of a symbol for an SRS exceeds a user equipment (UE) maximum transmit power,
- when the SRS is transmitted on at least two component carriers, scale each transmit power of the SRS on the at least two component carriers based on following equation:
- ∑
- c
-
-
- w
- c
-
- P
- SRS
- ,
- c
-
- (
- i
- )
- ≤
- P
- CMAX
- where PCMAX is the UE maximum transmit power, wc is a scaling factor, and PSRS,c is a transmit power of the SRS on a component carrier c of the at least two component carriers,
- identify an SRS bandwidth based on a grant which triggers the SRS, and
- control the transmitter to transmit the SRS based on the identified SRS transmit power and SRS bandwidth.
A base station of a communication system, the base station comprising:
- a transmitter;
- a receiver;
- and
- a controller configured to control the transmitter to transmit a grant which triggers a sounding reference signal (SRS) and to control the receiver to receive the SRS based on an SRS transmit power and an SRS bandwidth, and
- wherein the SRS transmit power is identified by power scaling based on a scaling factor if a total transmit power of a symbol for the SRS exceeds a user equipment (UE) maximum transmit power,
- wherein the SRS bandwidth is identified based on the grant, and
- wherein, when the SRS is received on the at least two component carriers, transmit power of the SRS on each of the at least two component carriers is scaled based on following equation:
- ∑
- c
-
-
- w
- c
-
- P
- SRS
- ,
- c
-
- (
- i
- )
- ≤
- P
- CMAX
- where PCMAX is the UE maximum transmit power, wc is the scaling factor, and PSRS,c is a transmit power of the SRS on a component carrier c of the at least two component carriers.
Dependencies are inferred from the claim text.