Location assistance information determination

Abstract

Methods and apparatus are described for providing location assistance information to a mobile device. An example of a method for providing location assistance information to the mobile device by a femto base station includes receiving a macro base station signal during a monitoring time period during which the femto base station is substantially stationary, obtaining location assistance information, the location assistance information being based, at least in part, on the received macro base station signal, and transmitting the location assistance information to the mobile device.

What is claimed is: 
     
         1 . A non-transitory processor-readable storage medium comprising processor-readable instructions for providing location assistance information to a mobile device by a femto base station, wherein the processor-readable instructions comprise:
 code for receiving a macro base station signal during a monitoring time period during which the femto base station is substantially stationary;   code for obtaining the location assistance information, the location assistance information being based, at least in part, on the macro base station signal and comprising at least one of a multipath effect determination or a time-of-transmission offset or a combination thereof wherein timing information associated with the femto base station is used in at least one of the multipath effect determination or the time-of-transmission offset or the combination thereof; and   code for transmitting the location assistance information to the mobile device.   
     
     
         2 . The non-transitory processor-readable storage medium of  claim 1 , wherein the timing information associated with the femto base station is adjusted based on a femto base station group delay offset value, the femto base station group delay offset value being a group delay difference between signal receiver chains. 
     
     
         3 . The non-transitory processor-readable storage medium of  claim 1 , wherein the code for receiving the macro base station signal comprises code for receiving a location reference signal (LRS) including at least one of a positioning reference signal (PRS) or a cell reference signal (CRS) or a combination thereof. 
     
     
         4 . The non-transitory processor-readable storage medium of  claim 3 , wherein the processor-readable instructions further comprise code for scanning over a plurality of frequencies during the monitoring time period. 
     
     
         5 . The non-transitory processor-readable storage medium of  claim 3 , wherein the location assistance information further comprises one or more of bandwidth, configuration index, muting pattern, number of frames, macro base station cell identifier, macro base station signal power, duty cycle, or frequency list. 
     
     
         6 . The non-transitory processor-readable storage medium of  claim 3 , wherein the code for receiving the LRS comprises:
 code for receiving a first LRS and a second LRS;   code for combining the first LRS and the second LRS; and   code for obtaining a set of reference signal parameters from a combined LRS.   
     
     
         7 . The non-transitory processor-readable storage medium of  claim 6 , wherein the first LRS is a first LRS fragment and the second LRS is a second LRS fragment. 
     
     
         8 . The non-transitory processor-readable storage medium of  claim 1 , wherein the code for obtaining the location assistance information comprises:
 code for providing femto base station information to a server; and   code for receiving the location assistance information, the location assistance information being based at least in part on the femto base station information.   
     
     
         9 . The non-transitory processor-readable storage medium of  claim 1 , wherein the code for obtaining the location assistance information comprises code for determining the location assistance information at the femto base station. 
     
     
         10 . A femto base station for providing location assistance information to a mobile device, the femto base station comprising:
 means for receiving a macro base station signal during a monitoring time period during which the femto base station is substantially stationary;   means for obtaining the location assistance information, the location assistance information being based, at least in part, on the macro base station signal and comprising at least one of a multipath effect determination or a time-of-transmission offset or a combination thereof wherein timing information associated with the femto base station is used in at least one of the multipath effect determination or the time-of-transmission offset or the combination thereof; and   means for transmitting the location assistance information to the mobile device and further wherein the femto base station is substantially stationary.   
     
     
         11 . The femto base station of  claim 10 , wherein the timing information associated with the femto base station is adjusted based on a femto base station group delay offset value, the femto base station group delay offset value being a group delay difference between signal receiver chains. 
     
     
         12 . The femto base station of  claim 10 , wherein the means for receiving comprises means for receiving a location reference signal (LRS) including at least one of a positioning reference signal (PRS) or a cell reference signal (CRS) or a combination thereof. 
     
     
         13 . The femto base station of  claim 12 , wherein the means for receiving comprises means for scanning over a plurality of frequencies during the monitoring time period. 
     
     
         14 . The femto base station of  claim 12 , the location assistance information further comprising one or more of bandwidth, configuration index, muting pattern, number of frames, macro base station cell identifier, macro base station signal power, duty cycle, or frequency list. 
     
     
         15 . The femto base station of  claim 12 , wherein the means for receiving comprises:
 means for receiving a first LRS and a second LRS;   means for combining the first LRS and the second LRS; and   means for obtaining a set of reference signal parameters from a combined LRS.   
     
     
         16 . The femto base station of  claim 15 , wherein the first LRS is a first LRS fragment and the second LRS is a second LRS fragment. 
     
     
         17 . The femto base station of  claim 10 , further comprising:
 means for providing femto base station information to a server; and   means for receiving the location assistance information, the location assistance information being based at least in part on the femto base station information.   
     
     
         18 . The femto base station of  claim 10 , further comprising means for determining the location assistance information at the femto base station. 
     
     
         19 . A non-transitory processor-readable storage medium comprising processor-readable instructions for providing location assistance information to a mobile device, wherein the processor-readable instructions comprise:
 code for receiving femto base station information from at least one femto base station;   code for obtaining the location assistance information, the location assistance information being based at least on part on the femto base station information and comprising at least one of a multipath effect determination or a time-of-transmission offset or a combination thereof wherein timing information associated with the at least one femto base station is used in at least one of the multipath effect determination or the time-of-transmission offset or the combination thereof;   code for identifying the mobile device;   code for selecting the location assistance information corresponding to the mobile device; and   code for providing the location assistance information to the mobile device.   
     
     
         20 . The non-transitory processor-readable storage medium of  claim 19 , wherein the femto base station information comprises one or more of femto base station location information, received signal phase information, received signal power information, a signal time-of-arrival, a signal time-of transmission, a signal time stamp, a reference SPS time standard, or a femto base station group delay offset value and further wherein the code for obtaining the location assistance information comprises code for determining the location assistance information. 
     
     
         21 . The non-transitory processor-readable storage medium of  claim 19 , wherein the code for obtaining the location assistance information comprises code for determining predicted location assistance information, the processor-readable instructions further comprising code for providing the predicted location assistance information to the mobile device. 
     
     
         22 . The non-transitory processor-readable storage medium of  claim 19 , wherein the location assistance information further comprises one or more of bandwidth, configuration index, muting pattern, number of frames, macro base station cell identifier, macro base station signal power, duty cycle, or frequency list. 
     
     
         23 . An apparatus for providing location assistance information to a mobile device, the apparatus comprising:
 means for receiving femto base station information from at least one femto base station;   means for obtaining the location assistance information, the location assistance information being based at least on part on the femto base station information and comprising at least one of a multipath effect determination or a time-of-transmission offset or a combination thereof wherein timing information associated with the at least one femto base station is used in at least one of the multipath effect determination or the time-of-transmission offset or the combination thereof;   means for identifying the mobile device;   means for selecting the location assistance information corresponding to the mobile device; and   means for providing the location assistance information to the mobile device.   
     
     
         24 . The apparatus of  claim 23 , wherein the femto base station information comprises one or more of femto base station location information, received signal phase information, received signal power information, a signal time-of-arrival, a signal time-of-transmission, a signal time stamp, a reference SPS time standard, or a femto base station group delay offset value and further wherein the means for obtaining the location assistance information comprises means for determining the location assistance information. 
     
     
         25 . The apparatus of  claim 23 , further comprising:
 means for determining predicted location assistance information; and   means for providing the predicted location assistance information to the mobile device.   
     
     
         26 . The apparatus of  claim 23 , wherein the location assistance information further comprises one or more of bandwidth, configuration index, muting pattern, number of frames, macro base station cell identifier, macro base station signal power, duty cycle, or frequency list.