Method and apparatus for adjustments for delta-based power control in wireless communication systems

Abstract

Systems and methodologies are described that provide techniques for performing adjustments for delta-based power control and interference management in a wireless communication system. A terminal can utilize one or more delta-based power control techniques described herein upon engaging in a reverse link transmission after a predetermined period of silence or after receiving indications of interference from neighboring access points. A delta value can be computed through open-loop projection, based on which transmission resources such as bandwidth and/or transmit power can be increased or decreased to manage interference caused by the terminal. A delta value, other feedback from the terminal, and/or indications of interference caused by the terminal can also be communicated as feedback to a serving access point to allow the access point to assign transmission resources for the terminal.

What is claimed is: 
     
         1 . A wireless communications apparatus, comprising:
 a memory that stores data relating to a time at which a prior transmission was conducted and a threshold; and   a processor configured to determine whether the prior transmission occurred earlier than the threshold and, upon a positive determination, to compute one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value and to adjust a parameter to be used for transmissions based on the computed values.   
     
     
         2 . The wireless communications apparatus of  claim 1 , wherein the threshold is based on at least one of a number of frames, a number of superframes, and a time period. 
     
     
         3 . The wireless communications apparatus of  claim 1 , wherein the processor is further configured to adjust a transmit power offset to be used for transmissions based on the computed values. 
     
     
         4 . The wireless communications apparatus of  claim 1 , wherein the processor is further configured to adjust a bandwidth utilized for transmissions based on the computed values. 
     
     
         5 . The wireless communications apparatus of  claim 1 , wherein the memory further stores data relating to an assignment for a parameter to be used for transmissions, and the processor is further configured to adjust the parameter based on the assignment. 
     
     
         6 . The wireless communications apparatus of  claim 5 , wherein the processor is further configured to determine whether the assignment for a parameter to be used for transmissions matches a computed open loop value. 
     
     
         7 . The wireless communications apparatus of  claim 6 , wherein the processor is further configured to suspend transmission or to compute a new open loop value if the assignment does not match the computed open loop value. 
     
     
         8 . The wireless communications apparatus of  claim 1 , wherein the processor is further configured to communicate one or more of a computed open loop value and the adjusted parameter for transmissions to an access point. 
     
     
         9 . A computer-readable medium, comprising:
 code for causing a computer to conduct a reverse link transmission to a base station after a predetermined timing threshold;   code for causing a computer to compute one or more open loop delta-based parameters; and   code for causing a computer to adjust one or more of a bandwidth and a transmit power used for future transmissions to the base station based at least in part on the computed open loop delta-based parameters.   
     
     
         10 . The computer-readable medium of  claim 9 , wherein the code for causing a computer to compute includes code for causing a computer to compute one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value. 
     
     
         11 . The computer-readable medium of  claim 9 , wherein the timing threshold corresponds to at least one parameter selected from the group consisting of a number of frames, a number of superframes, and a time period. 
     
     
         12 . The computer-readable medium of  claim 9 , wherein the code for causing a computer to adjust includes:
 code for causing a computer to determine whether an other sector interference (OSI) indication corresponding to the reverse link transmission has been received; and   code for causing a computer to adjust one or more of the bandwidth and the transmit power used for future transmissions to the base station based at least in part on the determination.   
     
     
         13 . The computer-readable medium of  claim 9 , further comprising code for causing a computer to communicate at least one of the computed open loop delta-based parameters, an adjusted bandwidth, and an adjusted transmit power to the base station. 
     
     
         14 . An integrated circuit that executes computer-executable instructions for reverse link power control and interference management in a wireless communication system, the instructions comprising:
 conducting a reverse link transmission to a serving sector;   determining whether an OSI indication corresponding to the reverse link transmission has been received; and   adjusting one or more parameters to be used for future reverse link transmissions based at least in part on whether an OSI indication has been received.   
     
     
         15 . The integrated circuit of  claim 14 , wherein the adjusting includes adjusting one or more of a transmit power and a bandwidth to be used for future reverse link transmissions. 
     
     
         16 . The integrated circuit of  claim 14 , wherein the determining includes determining that an OSI indication corresponding to the prior transmission has been received, and the adjusting includes:
 selecting a lowest transmit power used within a predetermined period of time that caused an OSI indication; and   adjusting a transmit power to be used for future reverse link transmissions to the selected transmit power minus a delta value.   
     
     
         17 . The integrated circuit of  claim 14 , wherein the determining includes determining that an OSI indication corresponding to the prior transmission has not been received, and the adjusting includes:
 selecting a highest transmit power used within a predetermined period of time that did not cause an OSI indication; and   adjusting a transmit power to be used for future reverse link transmissions to the selected transmit power plus a delta value.   
     
     
         18 . A method for conducting reverse link power control in a wireless communication system, comprising:
 receiving one or more of a communication request and power control feedback information from a terminal;   receiving a report of OSI activity caused by the terminal; and   assigning a parameter to be used for communication by the terminal based on the received information and the received report of OSI activity.   
     
     
         19 . The method of  claim 18 , wherein the receiving a report of OSI activity includes receiving the report of OSI activity from the terminal. 
     
     
         20 . The method of  claim 18 , wherein the receiving a report of OSI activity includes receiving the report of OSI activity from a neighboring sector. 
     
     
         21 . The method of  claim 18 , wherein the receiving a report of OSI activity includes receiving a power metric that indicates OSI activity caused by the terminal. 
     
     
         22 . The method of  claim 18 , wherein the assigning includes assigning one or more of a transmit power and a bandwidth to be used for communication by the terminal. 
     
     
         23 . The method of  claim 18 , further comprising communicating the assigned parameter to the terminal. 
     
     
         24 . A wireless communications apparatus, comprising:
 a memory that stores data relating to a report of OSI activity caused by an access terminal and power control feedback information received from the access terminal; and   a processor configured to generate an assignment for transmission resources based on at least one of the report of OSI activity and the power control feedback and to communicate the assignment to the access terminal.   
     
     
         25 . The wireless communications apparatus of  claim 24 , wherein the assignment for transmission resources includes an assignment for one or more of a transmit power and a bandwidth. 
     
     
         26 . An apparatus that facilitates reverse link power control and interference management in a wireless communication system, comprising:
 means for receiving power control information and OSI information corresponding to a wireless terminal;   means for assigning one or more of a transmit power and a bandwidth to the wireless terminal based at least in part on the received information; and   means for communicating an assigned transmit power or an assigned bandwidth to the wireless terminal.   
     
     
         27 . A computer-readable medium, comprising:
 code for causing a computer to receive a report of OSI activity caused by a terminal;   code for causing a computer to generate an assignment for one or more of a transmit power or a bandwidth to be utilized by the terminal based at least in part on the received report; and   code for causing a computer to communicate the assignment to the terminal.   
     
     
         28 . The computer-readable medium of  claim 27 , wherein the code for causing a computer to receive includes code for causing a computer to receive the report of OSI activity from the terminal. 
     
     
         29 . The computer-readable medium of  claim 27 , wherein the code for causing a computer to receive includes code for causing a computer to receive the report of OSI activity from a neighbor access point. 
     
     
         30 . The computer-readable medium of  claim 27 , wherein the code for causing a computer to receive includes code for causing a computer to receive a power metric that indicates OSI activity caused by the terminal. 
     
     
         31 . An integrated circuit that executes computer-executable instructions for reverse link power and interference control in a wireless communication system, the instructions comprising:
 receiving feedback from a terminal, the feedback comprising a report of OSI indications received by the terminal;   assigning transmission resources to the terminal based on the received feedback; and   communicating the assigned transmission resources to the terminal.