Short-term interference mitigation in a wireless communication system

Abstract

Techniques for transmitting data with short-term interference mitigation in a wireless communication system are described. In one design, a serving base station may send a message to a terminal to trigger short-term interference mitigation. In response, the terminal may send a message to request at least one interfering base station to reduce interference on at least one resource. Each interfering base station may determine a transmit power level to be used for the at least one resource and may send a pilot at this transmit power level. The terminal may estimate the channel quality of the at least one resource based on at least one pilot received from the at least one interfering base station. The terminal may send information indicative of the estimated channel quality to the serving base station. The serving base station may send a data transmission on the at least one resource to the terminal.

What is claimed is: 
     
         1 . A method for wireless communication, comprising:
 sending a message to request transmit capability of a terminal for at least one resource; and   receiving a transmission comprising the transmit capability of the terminal for the at least one resource.   
     
     
         2 . The method of  claim 1 , further comprising:
 scheduling the terminal for data transmission based on the transmit capability of the terminal for the at least one resource.   
     
     
         3 . The method of  claim 1 , wherein the receiving a transmission comprises
 receiving a pilot sent by the terminal at a transmit power level determined based on the transmit capability of the terminal for the at least one resource.   
     
     
         4 . The method of  claim 3 , further comprising:
 estimating channel quality of the at least one resource based on the received pilot;   selecting a modulation and coding scheme based on the estimated channel quality of the at least one resource; and   sending a resource grant comprising the modulation and coding scheme to the terminal.   
     
     
         5 . The method of  claim 1 , further comprising:
 receiving a resource request from the terminal, wherein the message is sent in response to receiving the resource request.   
     
     
         6 . An apparatus for wireless communication, comprising:
 at least one processor configured to send a message to request transmit capability of a terminal for at least one resource, and to receive a transmission comprising the transmit capability of the terminal for the at least one resource.   
     
     
         7 . The apparatus of  claim 6 , wherein the at least one processor is configured to schedule the terminal for data transmission based on the transmit capability of the terminal for the at least one resource. 
     
     
         8 . The apparatus of  claim 6 , wherein the at least one processor is configured to receive a pilot sent by the terminal at a transmit power level determined based on the transmit capability of the terminal for the at least one resource. 
     
     
         9 . The apparatus of  claim 8 , wherein the at least one processor is configured to estimate channel quality of the at least one resource based on the received pilot, to select a modulation and coding scheme based on the estimated channel quality of the at least one resource, and to send a resource grant comprising the modulation and coding scheme to the terminal 
     
     
         10 . The apparatus of  claim 6 , wherein the at least one processor is configured to receive a resource request from the terminal and to send the message in response to receiving the resource request. 
     
     
         11 . A method for wireless communication, comprising:
 receiving a message from a serving base station requesting transmit capability of a terminal for at least one resource; and   sending to the serving base station a transmission comprising the transmit capability of the terminal for the at least one resource.   
     
     
         12 . The method of  claim 11 , further comprising:
 receiving a resource grant generated by the serving base station based on the transmit capability of the terminal for the at least one resource.   
     
     
         13 . The method of  claim 11 , wherein the sending the transmission comprises sending a pilot at a transmit power level determined based on the transmit capability of the terminal for the at least one resource. 
     
     
         14 . The method of  claim 11 , further comprising:
 receiving at least one message from at least one neighbor base station requesting reduction of interference on the at least one resource; and   determining a maximum transmit power level usable for the at least one resource based on the at least one message.   
     
     
         15 . The method of  claim 14 , wherein the determining the maximum transmit power level comprises
 estimating pathloss for each of the at least one neighbor base station based on received power of a message received from the neighbor base station, and   determining the maximum transmit power level usable for the at least one resource based on a target interference level for each neighbor base station and the estimated pathloss for each neighbor base station.   
     
     
         16 . The method of  claim 14 , wherein the sending the transmission comprises sending a pilot at the maximum transmit power level usable for the at least one resource. 
     
     
         17 . The method of  claim 11 , further comprising:
 sending a resource request to the serving base station, wherein the message is received in response to the resource request.   
     
     
         18 . An apparatus for wireless communication, comprising:
 at least one processor configured to receive a message from a serving base station requesting transmit capability of a terminal for at least one resource, and to send to the serving base station a transmission comprising the transmit capability of the terminal for the at least one resource.   
     
     
         19 . The apparatus of  claim 18 , wherein the at least one processor is configured to receive a resource grant generated by the serving base station based on the transmit capability of the terminal for the at least one resource. 
     
     
         20 . The apparatus of  claim 18 , wherein the at least one processor is configured to send a pilot at a transmit power level determined based on the transmit capability of the terminal for the at least one resource. 
     
     
         21 . The apparatus of  claim 18 , wherein the at least one processor is configured to receive at least one message from at least one neighbor base station requesting reduction of interference on the at least one resource, and to determine a maximum transmit power level usable for the at least one resource based on the at least one message. 
     
     
         22 . The apparatus of  claim 21 , wherein the at least one processor is configured to estimate pathloss for each of the at least one neighbor base station based on received power of a message received from the neighbor base station, and to determine the maximum transmit power level usable for the at least one resource based on a target interference level for each neighbor base station and the estimated pathloss for each neighbor base station. 
     
     
         23 . The apparatus of  claim 18 , wherein the at least one processor is configured to send a resource request to the serving base station and to receive the message in response to the resource request.