Apparatus and method for facilitating fallback access schemes

Abstract

Systems and methodologies are described that facilitate random access procedures using one or more fallback access schemes after initial access attempts have failed. UE equipped to determine failure of a first access request to a first base station due to interference from a second base station. Further, a UE equipped to determine the failure can do so and implement one or more fallback access schemes in response to the determination. In one example, a fallback access scheme allows the UE to select a secondary carrier frequency for communications with the first base station. In another example, a fallback access scheme allows the UE to designate the first base station as inaccessible and communicate with other base stations.

What is claimed is: 
     
         1 . A method of wireless communications, comprising:
 determining, by a first base station, a failure to decode a signal from a user equipment (UE);   detecting that a signal received from a secondary base station is above an interference threshold; and   broadcasting, using a primary carrier frequency, one or more secondary carrier frequencies for the UE to use for an initial access request.   
     
     
         2 . The method of  claim 1 , further comprising:
 receiving, using at least one of the one or more secondary carrier frequencies, the initial access request from the UE; and   processing the initial access request.   
     
     
         3 . The method of  claim 1 , further comprising:
 receiving, by the first base station, signals from the UE and the second base station.   
     
     
         4 . The method of  claim 1  wherein the interference threshold comprises a value above which communications with the UE are interfered with above a connection threshold percentage. 
     
     
         5 . A computer program product, comprising:
 a computer-readable medium comprising code for:
 determining, by a first base station, a failure to decode a signal from a UE; 
 detecting that a signal received from a secondary base station is above an interference threshold; and 
 broadcasting, using a primary carrier frequency, one or more secondary carrier frequencies for the UE to use for an initial access request. 
   
     
     
         6 . The computer program product of  claim 5 , wherein the computer-readable medium further comprises code for:
 receiving, using at least one of the one or more secondary carrier frequencies, the initial access request from the UE; and   processing the initial access request.   
     
     
         7 . The computer program product of  claim 5 , wherein the computer-readable medium further comprises code for:
 receiving, by the first base station, signals from the UE and the second base station.   
     
     
         8 . The computer program product of  claim 5 , wherein the interference threshold comprises a value above which communications with the UE are interfered with above a connection threshold percentage. 
     
     
         9 . An apparatus, comprising:
 means for determining, by a first base station, a failure to decode a signal from a UE;   means for detecting that a signal received from a secondary base station is above an interference threshold; and   means for broadcasting, using a primary carrier frequency, one or more secondary carrier frequencies for the UE to use for an initial access request.   
     
     
         10 . The apparatus of  claim 9 , further comprising:
 means for receiving, using at least one of the one or more secondary carrier frequencies, the initial access request from the UE; and   means for processing the initial access request.   
     
     
         11 . The apparatus of  claim 9 , further comprising:
 means for receiving, by the first base station, signals from the UE and the second base station.   
     
     
         12 . The apparatus of  claim 9  wherein the interference threshold comprises a value above which communications with the UE are interfered with above a connection threshold percentage. 
     
     
         13 . An apparatus for wireless communications, comprising:
 at least one processor configured to:
 determine a failure to decode a signal from a user equipment (UE); 
 detect that a signal received from a secondary base station is above an interference threshold; and 
 broadcast, using a primary carrier frequency, one or more secondary carrier frequencies for the UE to use for an initial access request. 
   
     
     
         14 . The method of  claim 13 , wherein the at least one processor is further configured to:
 receive, using at least one of the one or more secondary carrier frequencies, the initial access request from the UE; and   process the initial access request.   
     
     
         15 . The method of  claim 13 , wherein the at least one processor is further configured to:
 receive signals from the UE and the second base station.   
     
     
         16 . The apparatus of  claim 13  wherein the interference threshold comprises a value above which communications with the UE are interfered with above a connection threshold percentage.