Slow uplink power control
View Patent ↗Embodiments of the invention provide embodiments of the invention provide and method, network entity and user equipment for slow uplink power control of user equipment in a wireless communication system by responding to a long term control metric that is derived from an uplink channel metric over a plurality of transmission instances and a set of performance criteria. A method for slow uplink power control in accordance with and embodiment of the invention measures at least one uplink channel metric for user equipment and then determines an appropriate transmit power for the user equipment by using a control metric derived from the uplink channel metric corresponding to a plurality of transmission instances for the user equipment.
1. A method for slow uplink power control of signal transmissions from user equipments in communication systems, said method comprising:
measuring at least one uplink channel metric for at least one user equipment from a plurality of user equipments;
using a control metric derived from at least one uplink channel metric for at least one user equipment;
determining a transmit power for at least one user equipment using at least one criterion, said determining is based upon the control metric; and
transmitting a power control command to at least one user equipment using a downlink control channel shared among multiple user equipments, wherein the transmission of the power control command to at least one user equipment is at a rate that is slower than a transmission time interval (TTI).
2. A network element of a wireless communication system, said network element is coupled to an uplink channel and said network element configured to provide slow uplink power control responding to a control metric that is derived from filtering an uplink channel metric over a plurality of transmission instances and a set of performance criteria, wherein said network element transmits a power control command to at least one user equipment using a downlink control channel shared among multiple user equipments, wherein the transmission of the power control command to at least one user equipment is at a rate that is slower than a transmission time interval (TTI).
3. The network element of claim 2 , wherein the wireless communication system employs an orthogonal multiple access scheme.
4. The network element of claim 3 , wherein the orthogonal multiple access scheme is orthogonal frequency division multiple access (OFDMA).
5. A computer-readable medium encoded with one or more sequences of instructions for slow uplink power control, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to perform the steps of:
measuring at least one uplink channel metric for at least one user equipment from a plurality of user equipments;
filtering the at least one uplink channel metric over a plurality of transmission instances to obtain a control metric;
determining a transmit power for at least one user equipment using a set of performance criteria, said determining is based both upon the control metric and the set of performance criteria; and
transmitting a power control command to at least one user equipment using a downlink control channel shared among multiple user equipments, wherein the transmission of the power control command to at least one user equipment is at a rate that is slower than a transmission time interval (TTI).
6. The computer-readable medium of claim 5 , wherein the slow uplink power control is employed in a wireless communication system using an orthogonal multiple access scheme.
7. The computer-readable medium of claim 5 , wherein the orthogonal multiple access scheme is orthogonal frequency division multiple access (OFDMA).
8. The method of claim 1 , wherein the communication system is an IEEE 802.16e system.
9. The method of claim 1 , wherein the communication system is a WIMAX system.
10. The method of claim 1 , wherein the communication system is a WiBro system.
11. User equipment comprising:
a receiver configured to receive a slow power control command generated in accordance with claim 1 ; and
a processor for processing the slow power command.
12. The network element of claim 3 , wherein the orthogonal multiple access scheme is single-carrier orthogonal division multiple access (SC-FDMA).
13. The computer-readable medium of claim 5 , wherein the orthogonal multiple access scheme is single-carrier orthogonal division multiple access (SC-FDMA).
14. The method of claim 1 , wherein the rate of the transmission of the power control command is once every many transmissions of the downlink shared control channel.
15. The method of claim 2 , wherein the rate of the transmission of the power control command is once every many transmissions of the downlink shared control channel.
16. The method of claim 5 , wherein the rate of the transmission of the power control command is once every many transmissions of the downlink shared control channel.