Techniques to control uplink power
Techniques are described that provide uplink power control techniques that can support different uplink multi-input multi-output (MIMO) transmission schemes. Open and closed loop power control schemes can be used to prescribe the power level of the mobile station.
1. A method comprising:
receiving, at a serving base station, noise plus interference level information (NI) from at least one neighboring base station;
receiving, at the serving base station, a request from a mobile station for identification of a calculation formula for determining a target signal to interference and noise ratio (SINR Target );
determining, by the serving base station, a control factor, the control factor including identification of the calculation formula for determining SINR Target , a signal to interference and noise ratio (SINR) requirement for the minimum data rate expected by the base station (SINR MIN ), and the NI;
transmitting, by the serving base station, the control factor to the mobile station; and
receiving, at the serving base station, a signal from at least one antenna of the mobile station, an uplink transmit power of the signal from the at least one antenna calculated by the mobile station using the identified calculation formula for determining SINR Target , the SINR MIN and the NI provided by the control factor sent to the mobile station by the serving base station.
2. The method of claim 1 , wherein the uplink transmit power per antenna is based on:
P (dBm)= L +SINR Target +NI, where
L comprises the estimated average uplink propagation loss.
3. The method of claim 2 , wherein:
the SINR Target is based at least in part on:
SINR
Target
=
10
log
10
(
max
(
10
⋀
(
SINR
MIN
10
)
,
γ
×
SINR
DL
-
1
N
r
)
)
,
where
γ represents a fairness and interference over thermal (IoT) control factor,
SINR DL comprises a ratio of useful downlink signal to downlink interference power measured at the mobile station, and
N r comprises the number of receive antennas at the base station in communication with the mobile station.
4. The method of claim 3 , wherein:
the IoT control factor is based at least in-part on uplink interference level of neighboring base stations.
5. The method of claim 1 , wherein the uplink transmit power per antenna is based on:
P (dBm)= L +SINR Target +NI+Offset_AMS perAMS +Offset_ABS perAMS ,
where
L comprises an estimated average current uplink propagation loss,
Offset_AMS perAMS comprises a correction term for Adaptive MIMO Switching (AMS)-specific power offset, and
Offset_ABS perAMS comprises a correction term for AMS-specific power offset.
6. The method of claim 5 , wherein:
the SINR Target is based at least in part on:
SINR
target
=
{
C
/
N
-
10
log
10
(
R
)
,
mode
1
SINR
OPT
,
mode
2
,
where
C/N comprises a normalized carrier-to-noise ratio of a modulation/FEC rate for a current transmission,
R comprises a number of repetitions for the modulation/FEC rate, and
SINR OPT comprises a target SINR value for interference over thermal control;
wherein the control factor identifies mode 1 or mode 2 for use in calculating the SINR Target .
7. A base station comprising:
logic to receive noise plus interference level information (NI) from at least one neighboring base station;
logic to receive a request from a mobile station for identification of a calculation formula for determining a target signal to interference and noise ratio (SINR Target );
logic to determine a control factor, the control factor including identification of the calculation formula for determining SINR Target , a signal to interference and noise ratio (SINR) requirement for the minimum data rate expected by the base station SINR MIN ), and the NI;
logic to transmit the control factor to the mobile station; and
logic to receive a signal from at least one antenna of the mobile station, an uplink transmit power of the signal from the at least one antenna calculated by the mobile station using the identified calculation formula for determining SINR Target , the SINR MIN and the NI provided by the control factor sent to the mobile station.
8. The base station of claim 7 , wherein the uplink transmit power level is to determine:
P (dBm)= L +SINR Target +NI, where
L comprises the estimated average uplink propagation loss.
9. The base station of claim 7 , wherein the uplink transmit power per antenna is based on:
P (dBm)= L +SINR Target +NI+Offset_AMS perAMS +Offset_ABS perAMS ,
where
L comprises an estimated average current uplink propagation loss,
Offset_AMS perAMS comprises a correction term for Adaptive MIMO Switching (AMS)-specific power offset, and
Offset_ABS perAMS comprises a correction term for AMS-specific power offset.
10. A system comprising:
at least one antenna,
a computer system communicatively coupled to the at least one antenna, the computer system comprising:
logic to determine a transmit power for at least one antenna, wherein the logic to determine the transmit power comprises logic to send a request to a serving base station for identification of a calculation formula for determining a target signal to interference and noise ratio (SINR Target ) and logic to receive a control factor from the serving base station the control factor including identification of the calculation formula for determining SINR Target , a signal to interference and noise ratio (SINR) requirement for the minimum data rate expected by the base station SINR MIN ), and noise plus interference level information (NI) obtained from at least one neighboring base station and
logic to transmit a signal from at least one antenna based on the determined transmit power, wherein the logic to determine the transmit power:
further includes logic to calculate an uplink transmit power from the at least one antenna using the identified calculation formula for determining SINR Target , the SINR MIN and the NI provided by the control factor.
11. The system of claim 10 , wherein the logic to determine a transmit power for at least one antenna is to determine:
P (dBm)= L +SINR Target +NI, where
L comprises path loss.
12. The system of claim 10 , wherein the logic to determine a transmit power for at least one antenna is to determine:
P (dBm)= L +SINR Target +NI+Offset_AMS perAMS +Offset_ABS perAMS ,
where
L comprises path loss,
Offset_AMS perAMS comprises a correction term for Adaptive MIMO Switching (AMS)-specific power offset, and
Offset_ABS perAMS comprises a correction term for AMS-specific power offset.