Power budget calculation using power headroom
Methods and computer software are disclosed for determining a power budget for physical channels in a system. The method may include, obtaining a mean and variance of a previously computed power component; determining an estimate of a current power component in a current frame based on the mean and variance of the previously computed power component; and computing a power budget in a current frame using the estimate of the current power component.
1. A method for determining a power budget for physical channels in a cellular network, comprising:
receiving, at a transmit processing chain of an eNodeB of the cellular network, transmit data, power data and other transmit parameters from a scheduler;
determining, by the eNodeB, a mean and a variance of a previously computed power component;
determining, by the eNodeB, an estimate of a current power component in a current frame based on the mean and the variance of the previously computed power component multiplying a variance value by a mean of the current power component; and
computing by the eNodeB, a power budget in a current frame using the estimate of the current power component by subtracting the estimate of the current power component from a maximum transmit power value.
2. The method of claim 1 , wherein determining the mean of the current power component comprises taking a summation for an averaging period of the current power measurement.
3. The method of claim 2 , wherein determining the variance value comprises providing a function that derives the variance value based on a variance of the current power component.
4. A method for determining a power budget for High-Speed Downlink Packet Access (HSDPA) physical channels in a Wideband Code Division Multiple Access (WCDMA) system, comprising:
receiving, at a transmit processing chain of an eNodeB of the WCDMA system, transmit data, power data and other transmit parameters from a scheduler,
determining, by the eNodeB, a mean and a variance of a previously computed non-HSDPA power component;
determining, by the eNodeB, an estimate of a current non-HSDPA power component in a current frame based on the mean and variance of the previously computed non-HSDPA power component by multiplying a variance value by a mean of the current power component; and
computing, by the eNodeB, a power budget for HSDPA in a current frame using the estimate of the current non-HSDPA power component by subtracting the estimate of the current non-HSDPA power component from a maximum transmit power value.
5. The method of claim 4 , wherein determining the mean of the current power component comprises taking a summation for an averaging period of the current power measurement.
6. The method of claim 5 , wherein determining the variance value comprises providing a function that derives the variance value based on a variance of the current power component.
7. The method of claim 6 , wherein the values of the mean and the variance vary depending on different parameters.
8. The method of claim 7 , wherein the parameters include at least one of channel conditions, a number of active users, High Speed Uplink Packet Access (HSUPA) load, and a mobility of users.
9. The method of claim 4 , wherein the power budget for High-Speed Downlink Packet Access (HSDPA) physical channels is determined for every frame.
10. A non-transitory computer-readable medium containing instructions for determining a power budget for physical channels in a cellular network, the instructions comprising:
receiving, at a transmit processing chain of an eNodeB of the cellular network, transmit data, power data and other transmit parameters from a scheduler,
determining, by the eNodeB, a mean and a variance of a previously computed power component;
determining, by the eNodeB, an estimate of a current power component in a current frame based on the mean and the variance of the previously computed power component multiplying a variance value by a mean of the current power component; and
computing by the eNodeB, a power budget in a current frame using the estimate of the current power component by subtracting the estimate of the current power component from a maximum transmit power value.
11. The non-transitory computer-readable medium of claim 10 , wherein determining the mean of the current power component comprises taking a summation for an averaging period of the current power measurement.
12. The non-transitory computer-readable medium of claim 11 , wherein determining the variance value comprises providing a function that derives the variance value based on a variance of the current power component.
13. The non-transitory computer-readable medium of claim 12 , wherein the power budget is for High-Speed Downlink Packet Access (HSDPA) physical channels in a Wideband Code Division Multiple Access (WCDMA) system.
14. The non-transitory computer-readable medium of claim 13 , the instructions further comprising determining the power budget for High-Speed Downlink Packet Access (HSDPA) physical channels for every frame.
15. The non-transitory computer-readable medium of claim 14 , wherein the values of the mean and the variance vary depending on different parameters, and wherein the parameters include at least one of channel conditions, a number of active users, High Speed Uplink Packet Access (HSUPA) load, and a mobility of users.