Listen-Before-Talk Procedures and Modification of Cell Configuration Parameters

Abstract

A wireless device may communicate with multiple base stations via multiple cells. The wireless device may indicate to at least one of the base stations a failure of a listen-before-talk (LBT) procedure. A base station may reconfigure another base station based on the failure of the LBT procedure.

1 . A method comprising:
 sending, by a first base station to a wireless device, configuration parameters of:
 a first plurality of cells for communication with the first base station; and 
 a second plurality of cells for communication with a second base station, wherein the second plurality of cells comprises one or more unlicensed cells; 
   receiving, by the first base station from the wireless device, an indication of a failure of a listen before talk (LBT) procedure for at least one first unlicensed cell of the one or more unlicensed cells; and   based on the failure of the LBT procedure for the at least one first unlicensed cell, sending, by the first base station to the second base station an indication of modification of at least one configuration parameter of at least one second unlicensed cell of the one or more unlicensed cells.   
     
     
         2 . The method of  claim 1 , wherein the at least one first unlicensed cell comprises a primary secondary cell (PSCell). 
     
     
         3 . The method of  claim 1 , wherein the indication of the modification of the at least one configuration parameter of the at least one second unlicensed cell indicates change of a PSCell. 
     
     
         4 . The method of  claim 1 , wherein the indication of the failure of the LBT procedure comprises a radio resource control (RRC) message. 
     
     
         5 . The method of  claim 1 , wherein the indication of the failure of the LBT procedure comprises at least one of:
 an indication of a failure type of one or more failure types; or   an information element configured to indicate success or failure of the LBT procedure.   
     
     
         6 . The method of  claim 5 , wherein the one or more failure types comprise a failure of a procedure due to failure of the LBT procedure. 
     
     
         7 . The method of  claim 1 , wherein the indication of the modification of the at least one configuration parameter of the at least one second unlicensed cell comprises at least one of:
 an indication of a failure type of one or more failure types; or   an SeNB Modification Request message.   
     
     
         8 . The method of  claim 1 , further comprising receiving, by the first base station from the second base station, a message associated with the modification of the at least one configuration parameter, and wherein the message comprises at least one of:
 an SeNB Modification Confirm message; or   an indication of success or failure of the modification.   
     
     
         9 . The method of  claim 1 , wherein the at least one first unlicensed cell and the at least one second unlicensed cell are a same unlicensed cell. 
     
     
         10 . The method of  claim 1 , wherein the one or more unlicensed cells comprise at least one of:
 a licensed assisted access (LAA) cell;   a cell that uses an unlicensed spectrum for transmission;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more 3GPP standards;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more non-3GPP standards;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more regulatory requirements;   a primary cell;   a secondary cell; or a primary secondary cell.   
     
     
         11 . A base station comprising:
 one or more processors;   memory storing instructions that, when executed by the one or more processors, cause the base station to:
 send, to a wireless device, configuration parameters of:
 a first plurality of cells for communication with the base station; and 
 a second plurality of cells for communication with a second base station, wherein the second plurality of cells comprises one or more unlicensed cells; 
 
 receive, from the wireless device, an indication of a failure of a listen before talk (LBT) procedure for at least one first unlicensed cell of the one or more unlicensed cells; and 
 based on the failure of the LBT procedure for the at least one first unlicensed cell, send, to the second base station, an indication of modification of at least one configuration parameter of at least one second unlicensed cell of the one or more unlicensed cells. 
   
     
     
         12 . The base station of  claim 11 , wherein the at least one first unlicensed cell comprises a primary secondary cell (PSCell). 
     
     
         13 . The base station of  claim 11 , wherein the indication of the modification of the at least one configuration parameter of the at least one second unlicensed cell indicates change of a PSCell. 
     
     
         14 . The base station of  claim 11 , wherein the indication of the failure of the LBT procedure comprises a radio resource control (RRC) message. 
     
     
         15 . The base station of  claim 11 , wherein the indication of the failure of the LBT procedure comprises at least one of:
 an indication of a failure type of one or more failure types; or   an information element configured to indicate success or failure of the LBT procedure.   
     
     
         16 . The base station of  claim 15 , wherein the one or more failure types comprise a failure of a procedure due to failure of the LBT procedure. 
     
     
         17 . The base station of  claim 11 , wherein the indication of the modification of the at least one configuration parameter of the at least one second unlicensed cell comprises at least one of:
 an indication of a failure type of one or more failure types; or   an SeNB Modification Request message.   
     
     
         18 . The base station of  claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to receive, from the second base station, a message associated with the modification of the at least one configuration parameter, and wherein the message comprises at least one of:
 an SeNB Modification Confirm message; or   an indication of success or failure of the modification.   
     
     
         19 . The base station of  claim 11 , wherein the at least one first unlicensed cell and the at least one second unlicensed cell are a same unlicensed cell. 
     
     
         20 . The base station of  claim 11 , wherein the one or more unlicensed cells comprise at least one of:
 a licensed assisted access (LAA) cell;   a cell that uses an unlicensed spectrum for transmission;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more 3GPP standards;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more non-3GPP standards;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more regulatory requirements;   a primary cell;   a secondary cell; or   a primary secondary cell.   
     
     
         21 . One or more non-transitory computer-readable media storing instructions that, when executed, cause:
 sending, to a wireless device, configuration parameters of:
 a first plurality of cells for communication with a first base station; and 
 a second plurality of cells for communication with a second base station, wherein the second plurality of cells comprises one or more unlicensed cells; 
 receiving, from the wireless device, an indication of a failure of a listen before talk (LBT) procedure for at least one first unlicensed cell of the one or more unlicensed cells; and 
 based on the failure of the LBT procedure for the at least one first unlicensed cell, sending, to the second base station, an indication of modification of at least one configuration parameter of at least one second unlicensed cell of the one or more unlicensed cells. 
   
     
     
         22 . The one or more non-transitory computer-readable media of  claim 21 , wherein the at least one first unlicensed cell comprises a primary secondary cell (PSCell). 
     
     
         23 . The one or more non-transitory computer-readable media of  claim 21 , wherein the indication of the modification of the at least one configuration parameter of the at least one second unlicensed cell indicates change of a PSCell. 
     
     
         24 . The one or more non-transitory computer-readable media of  claim 21 , wherein the indication of the failure of the LBT procedure comprises a radio resource control (RRC) message. 
     
     
         25 . The one or more non-transitory computer-readable media of  claim 21 , wherein the indication of the failure of the LBT procedure comprises at least one of:
 an indication of a failure type of one or more failure types; or   an information element configured to indicate success or failure of the LBT procedure.   
     
     
         26 . The one or more non-transitory computer-readable media of  claim 21 , wherein the one or more failure types comprise a failure of a procedure due to failure of the LBT procedure. 
     
     
         27 . The one or more non-transitory computer-readable media of  claim 21 , wherein the indication of the modification of the at least one configuration parameter of the at least one second unlicensed cell comprises at least one of:
 an indication of a failure type of one or more failure types; or   an SeNB Modification Request message.   
     
     
         28 . The one or more non-transitory computer-readable media of  claim 21 , wherein the instructions, when executed, further cause receiving, from the second base station, a message associated with the modification of the at least one configuration parameter, and wherein the message comprises at least one of:
 an SeNB Modification Confirm message; or   an indication of success or failure of the modification.   
     
     
         29 . The one or more non-transitory computer-readable media of  claim 21 , wherein the at least one first unlicensed cell and the at least one second unlicensed cell are a same unlicensed cell. 
     
     
         30 . The one or more non-transitory computer-readable media of  claim 21 , wherein the one or more unlicensed cells comprise at least one of:
 a licensed assisted access (LAA) cell;   a cell that uses an unlicensed spectrum for transmission;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more 3GPP standards;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more non-3GPP standards;   a cell that uses an unlicensed spectrum for transmission in accordance with one or more regulatory requirements;   a primary cell;   a secondary cell; or   a primary secondary cell.