Uplink cross-carrier scheduling for time division multiplexing carrier aggregation
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may configure an uplink transmission pattern related to an uplink transmission resource on multiple component carriers. The base station may transmit, to a user equipment (UE), information related to activating the uplink transmission pattern in a single scheduling message. Accordingly, the UE may transmit information on the multiple component carriers in one or more uplink symbols based at least in part on the uplink transmission pattern. Numerous other aspects are provided.
1. A method of wireless communication performed by a base station, comprising:
configuring an uplink transmission pattern related to an uplink transmission resource on multiple component carriers for a user equipment (UE),
wherein the uplink transmission pattern indicates an availability of a set of slots, symbols, or subframes of the multiple component carriers for performing one or more uplink transmissions or one or more repetitions of an uplink transmission on the uplink transmission resource; and
transmitting, to a user equipment (UE), information related to activating the uplink transmission pattern in a single scheduling message,
wherein the single scheduling message is a downlink control information (DCI) message comprising information indicating a limit on a specific absorption rate that is effective until a next scheduling message or wherein the single scheduling message is a radio resource control (RRC) message and comprises information indicating a limit on a specific absorption rate that is effective when the UE is in an RRC connected state.
2. The method of claim 1 , wherein the single scheduling message comprises the RRC message that includes at least a scheduling periodicity and information related to an expiration timer for each of the multiple component carriers based at least in part on the uplink transmission resource relating to an uplink semi-persistent scheduling (SPS) configuration.
3. The method of claim 2 , wherein the RRC message further includes information related to a resource configuration for each of the multiple component carriers.
4. The method of claim 2 , wherein the DCI message comprises information related to a resource configuration for each of the multiple component carriers.
5. The method of claim 4 , wherein the DCI message is associated with an SPS radio network temporary identifier (SPS-RNTI) that is included in content of the DCI message or used to scramble a cyclic redundancy code associated with the DCI message.
6. The method of claim 1 , wherein the single scheduling message is an RRC information element (IE) that includes information related to one or more of the multiple component carriers, a resource configuration for each of the multiple component carriers, or a slot-level time offset for each of the multiple component carriers based at least in part on the uplink transmission resource relating to an uplink configured grant configuration.
7. The method of claim 6 , wherein the RRC IE indicates one or more slots that are unavailable for uplink transmission using the uplink transmission resource.
8. The method of claim 1 , wherein the DCI message includes at least one element to notify the UE that the uplink transmission pattern is to be in effect until the next scheduling message.
9. The method of claim 8 , wherein the at least one element in the DCI message identifies one or more slots or symbols that are available for uplink transmissions and a maximum allowed uplink transmit power until the next scheduling message.
10. The method of claim 1 , wherein the RRC message includes at least one information element to identify one or more slots or symbols available for uplink transmissions and a maximum allowed uplink transmit power over a time period.
11. The method of claim 1 , wherein the information related to activating the uplink transmission pattern enables the UE to derive one or more symbols that are available for uplink transmissions on the multiple component carriers.
12. The method of claim 1 , wherein the uplink transmission pattern is based at least in part on hard coded information that is stored in a memory of the base station or scheduling information that is determined by the base station and transparent to the UE.
13. The method of claim 1 , wherein the single scheduling message interrupts usage of the uplink transmission resource.
14. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a base station, a single scheduling message including information related to activating an uplink transmission pattern related to an uplink transmission resource on multiple component carriers,
wherein the single scheduling message is a downlink control information (DCI) message comprising information indicating a limit on a specific absorption rate that is effective until a next scheduling message or wherein the single scheduling message is a radio resource control (RRC) message and comprises information indicating a limit on a specific absorption rate that is effective when the UE is in an RRC connected state, and
wherein the uplink transmission pattern indicates an availability of a set of slots, symbols, or subframes of the multiple component carriers for performing one or more uplink transmissions or one or more repetitions of an uplink transmission on the uplink transmission resource; and
transmitting information on the multiple component carriers in one or more uplink symbols based at least in part on the uplink transmission pattern.
15. The method of claim 14 , wherein the RRC message includes at least a scheduling periodicity and information related to an expiration timer for each of the multiple component carriers based at least in part on the uplink transmission resource relating to an uplink semi-persistent scheduling (SPS) configuration.
16. The method of claim 15 , wherein the RRC message further includes information related to a resource configuration for each of the multiple component carriers.
17. The method of claim 15 , wherein the DCI message includes information related to a resource configuration for each of the multiple component carriers.
18. The method of claim 17 , wherein the DCI message is associated with an SPS radio network temporary identifier (SPS-RNTI) that is included in content of the DCI message or used to scramble a cyclic redundancy code associated with the DCI message.
19. The method of claim 14 , wherein the single scheduling message is an RRC information element (IE) that includes information related to one or more of the multiple component carriers, a resource configuration for each of the multiple component carriers, or a slot-level time offset for each of the multiple component carriers based at least in part on the uplink transmission resource relating to an uplink configured grant configuration.
20. The method of claim 19 , wherein the RRC IE indicates one or more slots that are unavailable for uplink transmission using the uplink transmission resource.
21. The method of claim 14 , wherein the DCI message includes at least one element to notify the UE that the uplink transmission pattern is to be in effect until the next scheduling message.
22. The method of claim 21 , wherein the at least one element in the DCI message identifies one or more slots or symbols that are available for uplink transmissions and a maximum allowed uplink transmit power until the next scheduling message.
23. The method of claim 14 , wherein the RRC message includes at least one information element to identify one or more slots or symbols available for uplink transmissions and a maximum allowed uplink transmit power over a time period.
24. The method of claim 14 , wherein the information related to activating the uplink transmission pattern enables the UE to derive one or more symbols that are available for uplink transmissions on the multiple component carriers.
25. The method of claim 14 , wherein the uplink transmission pattern is based at least in part on hard coded information that is stored in a memory of the base station or scheduling information that is determined by the base station and transparent to the UE.
26. The method of claim 14 , wherein the single scheduling message interrupts usage of the uplink transmission resource.
27. A base station for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
configure an uplink transmission pattern related to an uplink transmission resource on multiple component carriers; and
transmit, to a user equipment (UE), information related to activating the uplink transmission pattern in a single scheduling message,
wherein the single scheduling message is a downlink control information (DCI) message comprising information indicating a limit on a specific absorption rate that is effective until a next scheduling message or wherein the single scheduling message is a radio resource control (RRC) message and comprises information indicating a limit on a specific absorption rate that is effective when the UE is in an RRC connected state, and
wherein the uplink transmission pattern indicates an availability of a set of slots, symbols, or subframes of the multiple component carriers for performing one or more uplink transmissions or one or more repetitions of an uplink transmission on the uplink transmission resource.
28. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
receive, from a base station, a single scheduling message including information related to activating an uplink transmission pattern related to an uplink transmission resource on multiple component carriers,
wherein the single scheduling message is a downlink control information (DCI) message comprising information indicating a limit on a specific absorption rate that is effective until a next scheduling message or wherein the single scheduling message is a radio resource control (RRC) message and comprises information indicating a limit on a specific absorption rate that is effective when the UE is in an RRC connected state, and
wherein the uplink transmission pattern indicates an availability of a set of slots, symbols, or subframes of the multiple component carriers for performing one or more uplink transmissions or one or more repetitions of an uplink transmission on the uplink transmission resource; and
transmit information on the multiple component carriers in one or more uplink symbols based at least in part on the uplink transmission pattern.