Methods and apparatuses for cell configuration

Abstract

A wireless device and method for performing cell configuration. The wireless device and a first network node serving the wireless device are operating in a wireless communications network, wherein the first network node manages a first serving cell. When the wireless device is to send a second Random Access transmission in the first serving cell to the first network node while preparing to perform or performing configuration of a second serving cell managed by a second network node, the wireless device configures the second serving cell using a configuration time delay T act _ PSCell comprising at least a time delay T RA _ PCell due to the second RA transmission, otherwise the wireless device configures the second serving cell using the configuration time delay T act _ PSCell excluding the time delay T RA _ PCell due to the second RA transmission.

1 . A cell configuration method, the method comprising:
 a user equipment (UE) detecting that the UE has been triggered to perform a first random access (RA) on a first serving cell;   the UE determining whether the UE has been simultaneously triggered to: i) perform the first RA on the first serving cell and ii) perform a second RA on a second serving cell; and   the UE selecting a method for performing the first RA on the first serving cell based on whether or not the UE has determined that the UE has been simultaneously triggered to: i) perform the first RA on the first serving cell and ii) perform the second RA on the second serving cell.   
     
     
         2 . The method of  claim 1 , wherein the first serving cell is primary secondary cell (PSCell) and the second serving cell is a primary cell (PCell). 
     
     
         3 . The method of  claim 1 , further comprising:
 the UE, as a result of determining that the UE has been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell, performing the RA on the second serving cell prior to performing the RA on the first serving cell.   
     
     
         4 . The method of  claim 1 , wherein selecting the method comprises selecting a first configuration time delay or a second configuration time delay based on the determination. 
     
     
         5 . The method of  claim 4 , wherein selecting the first configuration time delay or the second configuration time delay based on the determination comprises:
 selecting the second configuration time delay as a result of determining that the UE has not been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell.   
     
     
         6 . The method of  claim 5 , wherein the second configuration time delay is expressed as:
 Tact_PSCell=α+TRRC+Tact+TSFNacq+TRA_PSCell, wherein α is a margin parameter, TRRC is a time delay due to a Radio Resource Control (RRC) procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a System Frame Number, SFN, acquisition procedure and TRA_PSCell is a time delay due to the RA transmission in the second serving cell managed by the second network node.   
     
     
         7 . The method of  claim 4 , wherein selecting the first configuration time delay or the second configuration time delay based on the determination comprises:
 selecting the first configuration time delay as a result of determining that the UE has been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell.   
     
     
         8 . The method of  claim 7 , wherein the first configuration time delay is expressed as:
   Tact_ PS Cell=β+ TRRC +Tact+ TSFN acq+ TRA _ PS Cell+ TRA _ P Cell *K,  
   wherein β is a margin parameter, TRRC is a time delay due to a RRC procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a SFN acquisition procedure, TRA_PSCell is a time delay due to the RA transmission in the second serving cell, TRA_PCell is a time delay due to the RA transmission in the first serving cell and K is an integer defining a number of RA transmissions in the first serving cell to be sent while the wireless device is preparing to perform or is performing configuration of the second serving cell.   
     
     
         9 . The method of  claim 1 , wherein determining whether the UE has been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell comprises the UE determining whether the UE has received a request to perform the second RA on the second serving cell within a certain amount of time of receiving a request to perform the first RA on the first serving cell. 
     
     
         10 . A computer program product comprising non-transitory computer readable storage medium comprising a computer program comprising instructions which, when executed on at least one processor of a user equipment (UE), causes the UE to perform the method of  claim 1 . 
     
     
         11 . A user equipment (UE) for performing cell configuration, the UE comprising:
 a memory; and   a processor coupled to the memory, wherein the UE is configured to:   detect whether the UE has been triggered to perform a first random access (RA) on a first serving cell;   determine whether the UE has been simultaneously triggered to: i) perform the first RA on the first serving cell and ii) perform a second RA on a second serving cell; and   select a method for performing the first RA on the first serving cell based on whether or not the UE has determined that the UE has been simultaneously triggered to: i) perform the first RA on the first serving cell and ii) perform the second RA on the second serving cell.   
     
     
         12 . The UE of  claim 11 , wherein the first serving cell is primary secondary cell (PSCell) and the second serving cell is a primary cell (PCell). 
     
     
         13 . The UE of  claim 11 , wherein the UE is further configured to:
 as a result of determining that the UE has been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell, perform the RA on the second serving cell prior to performing the RA on the first serving cell.   
     
     
         14 . The UE of  claim 11 , wherein the UE is configured to select the method by selecting a first configuration time delay or a second configuration time delay based on the determination. 
     
     
         15 . The UE of  claim 14 , wherein the UE is configured to select the first configuration time delay or the second configuration time delay based on the determination by performing a process comprising:
 selecting the second configuration time delay as a result of determining that the UE has not been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell.   
     
     
         16 . The UE of  claim 15 , wherein the second configuration time delay is expressed as:
   Tact_ PS Cell=α+ TRRC +Tact+ TSFN acq+ TRA _ PS Cell,
   
       wherein α is a margin parameter, TRRC is a time delay due to a Radio Resource Control procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a System Frame Number, SFN, acquisition procedure and TRA_PSCell is a time delay due to the RA transmission in the second serving cell managed by the second network node. 
     
     
         17 . The UE of  claim 14 , wherein the UE is configured to select the first configuration time delay or the second configuration time delay based on the determination by performing a process comprising:
 selecting the first configuration time delay as a result of determining that the UE has been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell.   
     
     
         18 . The UE of  claim 17 , wherein the first configuration time delay is expressed as:
   Tact_ PS Cell=β+ TRRC +Tact+ TSFN acq+ TRA _ PS Cell+ TRA _ P Cell *K,  
   wherein β is a margin parameter, TRRC is a time delay due to a RRC procedure, Tact is a time delay due to a second serving cell activation procedure, TSFNacq is a time delay due to a SFN acquisition procedure, TRA_PSCell is a time delay due to the RA transmission in the second serving cell, TRA_PCell is a time delay due to the RA transmission in the first serving cell and K is an integer defining a number of RA transmissions in the first serving cell to be sent while the wireless device is preparing to perform or is performing configuration of the second serving cell.   
     
     
         19 . The UE of  claim 11 , wherein the UE determines whether the UE has been simultaneously triggered to perform the first RA on the first serving cell and perform the second RA on the second serving cell by determining whether the UE has received a request to perform the second RA on the second serving cell within a certain amount of time of receiving a request to perform the first RA on the first serving cell.