Secondary cell activation and deactivation enhancements in new radio
Methods, systems, and devices for wireless communications are described. One method may include transmitting a first signal instructing a user equipment (UE) to transition a state of a secondary cell associated with the UE; determining an allocation of resources for the UE to communicate with the secondary cell; and transmitting a second signal including an indication of an active bandwidth part (BWP) used for the allocation of resources based on the determining. The active BWP and the first signal may indicate the transition of the state of the secondary cell.
1. A base station for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory, wherein the at least one processor is configured to:
configure a first bit and a second bit in a downlink control message, wherein the first bit represents first information corresponding to a first group of secondary cells and the second bit represents second information corresponding to a second group of secondary cells, wherein the first group of secondary cells includes a first plurality of secondary cells and the second group of secondary cells includes a second plurality of secondary cells, wherein the first information is indicative of a first state corresponding to each respective secondary cell of the first group of secondary cells, wherein the second information is indicative of a second state corresponding to each respective secondary cell of the second group of secondary cells, wherein the first state corresponds to a first dormant state or a first non-dormant state and the second state corresponds to a second dormant state or a second non-dormant state, wherein the downlink control message includes a bitmap having a maximum size of n bits, wherein the bitmap includes the first bit and the second bit, wherein n is an integer less than a total quantity of secondary cells represented by the bitmap, wherein the first plurality of secondary cells includes a first quantity of secondary cells and the second plurality of secondary cells includes a second quantity of secondary cells, and wherein the total quantity of secondary cells represented by the bitmap includes the first quantity and the second quantity; and
transmit the downlink control message to a user equipment (UE).
2. The base station of claim 1 , wherein the at least one processor is configured to:
configure a primary cell associated with the base station to switch to a default bandwidth part based at least in part on an expiration of a timer, wherein the default bandwidth part is configured to be a non-zero bandwidth part.
3. The base station of claim 1 , wherein the at least one processor is configured to:
configure the first group of secondary cells to switch from a fully activated state to the first state based at least in part on an expiration of a timer, wherein the first state is associated with a default bandwidth part comprising a zero bandwidth part.
4. The base station of claim 1 , wherein the at least one processor is configured to:
transmit signaling that indicates the first group of secondary cells and the second group of secondary cells, wherein the signaling comprises radio resource control (RRC) signaling or medium access control-control element (MAC-CE) signaling.
5. The base station of claim 1 , wherein the downlink control message of a primary cell associated with the base station carries bandwidth part activation control information for the first group of secondary cells.
6. The base station of claim 1 , wherein the downlink control message excludes scheduling information.
7. The base station of claim 6 , wherein the at least one processor is configured to:
configure the first bit or the second bit in a modulation coding scheme (MCS) field, a hybrid automatic repeat request (HARQ) identifier (ID) field, or a redundancy version (RV) field of the downlink control message.
8. The base station of claim 1 , wherein the at least one processor is configured to:
configure the downlink control message with a zero-resource allocation.
9. The base station of claim 8 , wherein the at least one processor is configured to:
configure the first bit or the second bit in a modulation coding scheme (MCS) field, a hybrid automatic repeat request (HARQ) identifier (ID) field, or a redundancy version (RV) field of the downlink control message.
10. A base station for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory, wherein the at least one processor is configured to:
configure a bitmap including a first bit and a second bit in a downlink control message, wherein the first bit represents first information corresponding to a first group of secondary cells and the second bit represents second information corresponding to a second group of secondary cells, wherein the first group of secondary cells includes a first plurality of secondary cells and the second group of secondary cells includes a second plurality of secondary cells, wherein the first information is indicative of a first state corresponding to each respective secondary cell of the first group of secondary cells, wherein the second information is indicative of a second state corresponding to each respective secondary cell of the second group of secondary cells, wherein the first state corresponds to a first dormant state or a first non-dormant state and the second state corresponds to a second dormant state or a second non-dormant state, wherein the bitmap has a maximum size of n bits, wherein n is an integer less than a total quantity of secondary cells represented by the bitmap, wherein the first plurality of secondary cells includes a first quantity of secondary cells and the second plurality of secondary cells includes a second quantity of secondary cells, and wherein the total quantity of secondary cells represented by the bitmap includes the first quantity and the second quantity; and
transmit the downlink control message to a user equipment (UE).
11. The base station of claim 10 , wherein the at least one processor is configured to:
identify a number of bits associated with the bitmap; and
configure at least one bit of the number of bits to indicate a target bandwidth part identifier based at least in part on the number of bits.
12. The base station of claim 10 , wherein the at least one processor is configured to:
transmit, during a secondary cell configuration procedure, signaling that indicates the first group of secondary cells and the second group of secondary cells, wherein the signaling comprises radio resource control (RRC) signaling or medium access control-control element (MAC-CE).
13. The base station of claim 10 , wherein the at least one processor is configured to:
configure at least one bit of the bitmap to indicate a selection of a primary cell.
14. The base station of claim 10 , wherein the at least one processor is configured to:
configure at least one bit of the bitmap based at least in part on a zero resource allocation.
15. The base station of claim 10 , wherein the downlink control message excludes scheduling information.
16. The base station of claim 15 , wherein the at least one processor is configured to:
configure the first bit or the second bit in a modulation coding scheme (MCS) field, a hybrid automatic repeat request (HARQ) identifier (ID) field, or a redundancy version (RV) field of the downlink control message.
17. The base station of claim 10 , wherein the at least one processor is configured to:
configure the downlink control message with a zero-resource allocation.
18. The base station of claim 17 , wherein the at least one processor is configured to:
configure the first bit or the second bit in a modulation coding scheme (MCS) field, a hybrid automatic repeat request (HARQ) identifier (ID) field, or a redundancy version (RV) field of the downlink control message.