Uplink noise minimization
A method of controlling uplink signal power in a distributed antenna system includes monitoring a noise condition of an uplink signal path in the distributed antenna system and determining the noise contribution from the distributed antenna system that is presented to the base station. The receive noise floor of the base station is determined. The determined noise contribution and receive noise floor are unlisted. Based on the evaluation, the uplink gain that is applied to uplink signals from the distributed antenna system to a base station is adjusted.
1. A method of controlling uplink signal power in a distributed antenna system having a master unit and a plurality of remote units and coupled with a base station, the method comprising:
monitoring a noise condition of an uplink signal path in the distributed antenna system including determining the noise contribution from the distributed antenna system that is presented to the base station;
determining the receive noise floor of the base station;
evaluating the determined noise contribution and receive noise floor and, based on the evaluation, adjusting an uplink gain that is applied to uplink signals from the distributed antenna system to a base station.
2. The method of claim 1 further comprising adjusting the uplink gain that is applied to uplink signals to establish a target noise floor for the noise contribution from the distributed antenna system.
3. The method of claim 2 further comprising evaluating a path loss from the distributed antenna system to a base station coupled thereto to establish the target noise floor.
4. The method of claim 1 further comprising adjusting the uplink gain to make the noise contribution from the distributed antenna system lower than the receive noise floor of the base station.
5. The method of claim 4 further comprising adjusting the uplink gain to make the noise contribution from the distributed antenna system lower than the receive noise floor of the base station by a threshold amount.
6. The method of claim 1 further comprising evaluating a path loss from the distributed antenna system to a base station coupled thereto, and adjusting the uplink gain to make the noise contribution from the distributed antenna system plus the path loss to the base station lower than the receive noise floor of the base station.
7. The method of claim 6 further comprising adjusting the uplink gain to make the noise contribution from the distributed antenna system plus the path loss to the base station lower than the receive noise floor of the base station by a threshold amount.
8. The method of claim 1 further comprising determining a noise contribution from the distributed antenna system by determining a number of active status remote units and dynamically adjusting the uplink gain by:
increasing the uplink gain in response to a decrease in the number of remote units that are active status; and
decreasing the uplink gain in response to an increase in the number of remote units that are active status.
9. The method of claim 8 further comprising providing a mute status indication for a remote unit that is not active status based on the activity level for the remote unit and monitoring the mute status indications for the remote units for dynamically adjusting the uplink gain.
10. The method of claim 9 further comprising placing the remote unit in active status or mute status based on at least one of determining the level of a received signal power with respect to a threshold or the level of data received.
11. The method of claim 1 further comprising determining a noise contribution from the distributed antenna system by determining the number of active status remote units and a noise figure associated with each remote unit to obtain a composite noise figure for the distributed antenna system and dynamically adjusting the uplink gain by:
increasing the uplink gain in response to a decrease in the composite noise figure; and
decreasing the uplink gain in response to an increase in the in the composite noise figure.
12. The method of claim 1 wherein determining the noise contribution from the distributed antenna system that is presented to the base station includes monitoring the noise floor associated with the master unit and dynamically adjusting the uplink gain by:
increasing the uplink gain in response to a decrease in the noise floor of the master unit; and
decreasing the uplink gain in response to an increase in the noise floor of the master unit.
13. The method of claim 1 wherein dynamically adjusting an uplink gain includes dynamically adjusting the uplink gain of at least one of the master unit, a remote unit or a portion of a remote unit.
14. A distributed antenna system, comprising:
a plurality of remote units; and
a master unit configured for coupling with the remote units and a base station;
the distributed antenna system configured for:
monitoring a noise condition of an uplink signal path in the distributed antenna system including determining the noise contribution from the distributed antenna system that is presented to the base station;
determining the receive noise floor of the base station; and
evaluating the determined noise contribution and receive noise floor and based on the evaluation, adjusting an uplink gain that is applied to uplink signals from the distributed antenna system to a base station.
15. The distributed antenna system of claim 14 wherein the distributed antenna system is configured for adjusting the uplink gain that is applied to uplink signals to establish a target noise floor for the noise contribution from the distributed antenna system.
16. The distributed antenna system of claim 15 further configured for evaluating a path loss from the distributed antenna system to a base station coupled thereto to establish the target noise floor.
17. The distributed antenna system of claim 14 further configured for adjusting the uplink gain to make the noise contribution from the distributed antenna system lower than the receive noise floor of the base station.
18. The distributed antenna system of claim 17 further configured for adjusting the uplink gain to make the noise contribution from the distributed antenna system lower than the receive noise floor of the base station by a threshold amount.
19. The distributed antenna system of claim 14 further configured for evaluating a path loss from the distributed antenna system to a base station coupled thereto, and for adjusting the uplink gain to make the noise contribution from the distributed antenna system plus the path loss to the base station is lower than the receive noise floor of the base station.
20. The distributed antenna system of claim 19 further configured for adjusting the uplink gain to make the noise contribution from the distributed antenna system plus the path loss to the base station lower than the receive noise floor of the base station by a threshold amount.