Multiple TRPs and panels transmission with dynamic bandwidth for NR
The present application is at least directed to an apparatus on a network including a non-transitory memory including instructions stored thereon for re-establishing a remote radio control (RRC) connection with a base station. The apparatus also includes a processor, operably coupled to the non-transitory memory, capable of executing an instruction of determining a radio link failure has occurred between a first bandwidth part (BWP) of the apparatus tuned to a base station. The processor also executes the instruction of initiating a random access (RA) procedure. The processor also executes the instruction of determining whether a configured contention-based physical random access channel (PRACH) resource overlaps with the first BWP. The process further executes the instruction of transmitting a RA preamble including the configured contention-based PRACH resource to the base station. The processor even further executes the instruction of receiving a RA response from the base station.
1. A wireless transmit/receive unit (WTRU) comprising:
a non-transitory memory including instructions stored thereon for re-establishing a remote radio control (RRC) connection with a base station; and
a processor, operably coupled to the non-transitory memory, capable of executing the instructions of:
determining, based upon a measurement in an active downlink bandwidth part (DL BWP), to initiate a random access channel (RACH) procedure;
initiating the RACH procedure;
determining whether one or more RACH resources is configured for an active uplink bandwidth part (UL BWP);
after determining no RACH resources are configured for the active UL BWP, switching to a default UL BWP, wherein at least one RACH resource is configured for the default UL BWP;
transmitting, to the base station, a random access (RA) preamble using one of the RACH resources configured for the default UL BWP;
receiving a RA response from the base station; and
switching from the default UL BWP to either the active UL BWP or another active UL BWP after re-establishing the RRC connection.
2. The WTRU of claim 1 , wherein the processor is further configured to execute the instructions of receiving a request from the base station to initiate RA based upon expiration of an alignment timer.
3. The WTRU of claim 1 , wherein the transmitted RA preamble occurs one symbol after reception of downlink control information (DCI).
4. The WTRU of claim 1 , wherein the transmitted RA preamble is associated with a synchronization signal block (SSB).
5. The WTRU of claim 1 , wherein the RACH procedure is initiated in view of a radio link failure between the WTRU and the base station.
6. The WTRU of claim 1 , wherein the processor is further configured to execute the instructions of switching to the default UL BWP after expiration of an inactivity timer.
7. A method comprising:
determining, based upon a measurement in an active downlink bandwidth part (DL BWP), to initiate a random access channel (RACH) procedure;
initiating the RACH procedure;
determining whether one or more RACH resources is configured for an active uplink bandwidth part (UL BWP);
after determining no RACH resources are configured for the active UL BWP, switching to a default UL BWP, wherein at least one RACH resource is configured for the default UL BWP;
transmitting, to a base station, a random access (RA) preamble using one of the RACH resources configured for the default UL BWP;
receiving a RA response from the base station; and
switching from the default UL BWP to either the active UL BWP or another active UL BWP after re-establishing a remote radio control (RRC) connection.
8. The method of claim 7 , further comprising:
receiving a request from the base station to initiate RA based upon expiration of an alignment timer.
9. The method of claim 7 , wherein the transmitted RA preamble occurs one symbol after reception of downlink control information (DCI).
10. The method of claim 7 , wherein the transmitted RA preamble is associated with a synchronization signal block (SSB).
11. The method of claim 7 , wherein the RACH procedure is initiated in view of a radio link failure with the base station.
12. The method of claim 7 , further comprising:
switching to the default UL BWP after expiration of an inactivity timer.