Apparatus and method for controlling reverse link interference among access terminals in wireless communications
AssigneeQUALCOMM Incorporated
InventorsJean Put Ling Au, Christopher Gerard Lott, Naga Bhushan, Rashid Ahmed Akbar Attar
Life of this patent
Estimating the term…
Abstract
In a wireless communication system, an apparatus and a method are provided for controlling reverse link interference among access terminals that are power controlled by a sector of a base station. In an embodiment, the maximum effective noise power spectral density is used as a parameter for controlling the level of reverse link loading, by setting a reverse activity bit (RAB) to signal the access terminals to reduce their data rates in order to minimize interference between the access terminals if the maximum effective noise power spectral density is above a predetermined threshold.
Claims20
A method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse link communications from the access terminals to the base station, the method comprising:
- determining an effective noise power spectral density (Nt,i,effective) at an access network for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by the sector;
- determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals;
- and
- determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum effective noise power spectral density.
A base station in a sector of a CDMA communication system, the base station comprising:
- an antenna;
- a transceiver connected to the antenna;
- and
- a computing deice connected to the transceiver, wherein the computing device is configured to cause the base station to perform steps comprising:
- for each access terminal of a plurality of access terminals in communication with the base station,
- determining an effective noise power spectral density (Nt,i,effective) at an access network for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec,) of all channels except pilot channels of at least some of the access terminals that are power controlled by the sector;
- determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals:
- and
- determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum effective noise power spectral density.
A base station apparatus, comprising:
- means for determining an effective noise power spectral density (Nt,i,effective) for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by a sector of the base station;
- means for determining maximum effective noise power spectral density (Nt,max,effective) among the access terminals;
- and
- means for determining a reverse activity bit (RAM) to signal all of the access terminals that are power controlled by the sector to change data rates based upon the maximum effective noise power spectral density.
A non-transitory computer readable medium containing computer executable instructions embodying a method of directing access terminals that are power controlled by a sector of a base station to change data rates in reverse in communications from the access terminals to the base station, the method comprising:
- determining an effective noise power spectral density (Nt,i,effective) at an access network for one of the access terminals (i) due to a thermal noise power spectral density (N0) and a sum of chip energy of (Ec) of all channels except pilot channels of at least some of the access terminals that are power controlled by the sector;
- determining a maximum effective noise power spectral density (Nt,max,effective) among the access terminals;
- and
- determining a reverse activity bit (RAB) to signal all of the access terminals that are power controlled by the sector to change the data rates based upon the maximum effective noise power spectral density.
Dependencies are inferred from the claim text.