Bandwidth part switching by activation and signaling
Methods, systems, and devices for wireless communications are described. Various techniques for bandwidth part activation and signaling are described. Control messaging may be used to indicate a mapping of beams and bandwidth part to respective indices, such as a bandwidth part identifier or a transmission configuration indicator (TCI) state codepoint. Further control messaging may specify one of these indices, and a user equipment (UE) may communicate with a network entity, such as a satellite or base station using a bandwidth part in a beam specified in the control messaging.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled with the one or more memories and configured to cause the UE to:
receive, from a network entity, a radio resource control message that configures a set of transmission configuration indicator states that include respective transmission configuration indicator state identifiers, respective transmission configuration indicator state types, and respective satellite beam identifiers;
receive, from the network entity, a first control message that includes an indication of a mapping of each transmission configuration indicator state of a subset of the set of transmission configuration indicator states to a respective transmission configuration indicator codepoint, wherein the first control message further includes a transmission configuration indicator state identifier indicative that at least one transmission configuration indicator state of the subset of the set of transmission configuration indicator states is a satellite beam index type;
receive, from the network entity, a second control message that includes a transmission configuration indicator codepoint and an indication of a bandwidth part identifier, wherein the transmission configuration indicator codepoint is mapped by the first control message to a transmission configuration indicator state of the at least one transmission configuration indicator state; and
communicate with the network entity on a bandwidth part that corresponds to the bandwidth part identifier and in a beam that is indicated in the transmission configuration indicator state.
2 . The apparatus of claim 1 , wherein, to receive the second control message, the one or more processors are configured to cause the UE to:
receive, from the network entity, the second control message in a single transmission that includes the transmission configuration indicator codepoint and the indication of the bandwidth part identifier.
3 . The apparatus of claim 1 , wherein, to receive the first control message, the one or more processors are configured to cause the UE to:
receive a medium access control-control element (MAC-CE) message that indicates the mapping.
4 . The apparatus of claim 1 , wherein, to receive the first control message, the one or more processors are configured to cause the UE to:
receive a bitmap, wherein each value in the bitmap indicates an activation state of a corresponding transmission configuration indicator state, and wherein the respective transmission configuration indicator codepoint is mapped to the transmission configuration indicator state based at least in part on the activation state being an active state as indicated by the bitmap.
5 . The apparatus of claim 1 , wherein, to receive the second control message, the one or more processors are configured to cause the UE to:
receive a downlink control information message that includes the transmission configuration indicator codepoint and the bandwidth part identifier.
6 . The apparatus of claim 1 , wherein the radio resource control message indicates that the UE is to switch to an uplink bandwidth part when a downlink bandwidth part is switched by the transmission configuration indicator codepoint of the second control message.
7 . The apparatus of claim 6 , wherein the one or more processors are configured to cause the UE to:
determine the bandwidth part that corresponds to the bandwidth part identifier to be different from a current bandwidth part; and
identify the uplink bandwidth part different from the current bandwidth part based at least in part on the determination that the bandwidth part is different from the current bandwidth part in accordance with the radio resource control message.
8 . The apparatus of claim 1 , wherein, to communicate with the network entity, the one or more processors are configured to cause the UE to:
determine that the beam identified by the transmission configuration indicator state is different from a current beam; and
perform a beam switch procedure to communicate with the network entity on the bandwidth part in the beam based at least in part on the determination that the beam is different from the current beam.
9 . The apparatus of claim 8 , wherein, to perform the beam switch procedure, the one or more processors are configured to cause the UE to:
identify one or more default bandwidth parts that correspond to the beam.
10 . The apparatus of claim 8 , wherein, to perform the beam switch procedure, the one or more processors are configured to cause the UE to:
adjust a frequency compensation, a timing parameter, or a combination thereof corresponding to the beam.
11 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the UE to:
de-map the transmission configuration indicator codepoint based at least in part on the mapping indicated in the first control message to identify the transmission configuration indicator state that indicates the beam.
12 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the UE to:
identify the beam from the transmission configuration indicator state based at least in part on a satellite beam identifier, a cell identifier, or a synchronization signal block index included in the transmission configuration indicator state.
13 . The apparatus of claim 1 , wherein the first control message is a medium access control layer signaling message and the second control message is a physical layer signaling message.
14 . An apparatus for wireless communication at a network entity, comprising:
one or more memories; and
one or more processors coupled with the one or more memories and configured to cause the network entity to:
transmit a radio resource control message that configures a set of transmission configuration indicator states that include respective transmission configuration indicator state identifiers, respective transmission configuration indicator state types, and respective satellite beam identifiers;
transmit a first control message that includes an indication of a mapping of each transmission configuration indicator state of a subset of the set of transmission configuration indicator states to a respective transmission configuration indicator codepoint, wherein the first control message further includes a transmission configuration indicator state identifier indicative that at least one transmission configuration indicator state of the subset of the set of transmission configuration indicator states is a satellite beam index type;
transmit a second control message that includes an indication of a transmission configuration indicator codepoint and an indication of a bandwidth part identifier, wherein the transmission configuration indicator codepoint is mapped by the first control message to a transmission configuration indicator state of the at least one transmission configuration indicator state; and
communicate on a bandwidth part that corresponds to the bandwidth part identifier and in a beam that is indicated in the transmission configuration indicator state.
15 . The apparatus of claim 14 , wherein, to transmit the second control message, the one or more processors are configured to cause the network entity to:
transmit the second control message in a single transmission that includes the transmission configuration indicator codepoint and the indication of the bandwidth part identifier.
16 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled with the one or more memories and configured to cause the UE to:
receive, from a network entity, a radio resource control message that configures a set of transmission configuration indicator states, wherein each transmission configuration indicator state of the set of transmission configuration indicator states includes a respective transmission configuration indicator state identifier, a respective transmission configuration indicator state type, and a respective satellite beam identifier;
receive, from the network entity, a control message that includes an indication of a transmission configuration indicator state identifier indicative that a transmission configuration indicator state of the set of transmission configuration indicator states is a satellite beam index type, wherein the control message further includes an indication of a satellite beam identifier; and
communicate with the network entity via a satellite beam that corresponds to the satellite beam identifier.
17 . The apparatus of claim 16 , wherein the one or more processors are configured to cause the UE to:
determine that the transmission configuration indicator state has a transmission configuration indicator state type that is the satellite beam index type.
18 . An apparatus for wireless communication at a network entity, comprising:
one or more memories; and
one or more processors coupled with the one or more memories and configured to cause the network entity to:
transmit a radio resource control message that configures a set of transmission configuration indicator states that include respective transmission configuration indicator state identifiers, respective transmission configuration indicator state types, and respective satellite beam identifiers;
transmit a control message that includes an indication of a transmission configuration indicator state identifier indicative that a transmission configuration indicator state of the set of transmission configuration indicator states is a satellite beam index type, wherein the control message further includes an indication of a satellite beam identifier; and
communicate via a satellite beam that corresponds to the satellite beam identifier.
19 . The apparatus of claim 18 , wherein, to transmit the control message, the one or more processors are configured to cause the network entity to:
transmit the control message indicative of the transmission configuration indicator state that has a transmission configuration indicator state type that is the satellite beam index type.
20 . A method for wireless communication at a user equipment (UE), comprising:
receiving, from a network entity, a radio resource control message that configures a set of transmission configuration indicator states that include respective transmission configuration indicator state identifiers, respective transmission configuration indicator state types, and respective satellite beam identifiers;
receiving, from the network entity, a first control message that includes an indication of a mapping of each transmission configuration indicator state of a subset of the set of transmission configuration indicator states to a respective transmission configuration indicator codepoint, wherein the first control message further includes a transmission configuration indicator state identifier indicative that at least one transmission configuration indicator state of the subset of the set of transmission configuration indicator states is a satellite beam index type;
receiving, from the network entity, a second control message that includes a transmission configuration indicator codepoint and an indication of a bandwidth part identifier, wherein the transmission configuration indicator codepoint is mapped by the first control message to a transmission configuration indicator state of the at least one transmission configuration indicator state; and
communicating with the network entity on a bandwidth part that corresponds to the bandwidth part identifier and in a beam that is indicated in the transmission configuration indicator state.
21 . The method of claim 20 , wherein receiving the second control message comprises:
receiving, from the network entity, the second control message in a single transmission that includes the transmission configuration indicator codepoint and the indication of the bandwidth part identifier.
22 . The method of claim 20 , wherein receiving the first control message comprises:
receiving a medium access control-control element (MAC-CE) message that indicates the mapping.
23 . The method of claim 20 , wherein receiving the first control message comprises:
receiving a bitmap, wherein each value in the bitmap indicates an activation state of a corresponding transmission configuration indicator state, and wherein the respective transmission configuration indicator codepoint is mapped to the transmission configuration indicator state based at least in part on the activation state being an active state as indicated by the bitmap.
24 . A method for wireless communication at a network entity, comprising:
transmitting a radio resource control message that configures a set of transmission configuration indicator states that include respective transmission configuration indicator state identifiers, respective transmission configuration indicator state types, and respective satellite beam identifiers;
transmitting a first control message that includes an indication of a mapping of each transmission configuration indicator state of a subset of the set of transmission configuration indicator states to a respective transmission configuration indicator codepoint, wherein the first control message further includes a transmission configuration indicator state identifier indicative that at least one transmission configuration indicator state of the subset of the set of transmission configuration indicator states is a satellite beam index type;
transmitting a second control message that includes an indication of a transmission configuration indicator codepoint and an indication of a bandwidth part identifier, wherein the transmission configuration indicator codepoint is mapped by the first control message to a transmission configuration indicator state of the at least one transmission configuration indicator state; and
communicating on a bandwidth part that corresponds to the bandwidth part identifier and in a beam that is indicated in the transmission configuration indicator state.
25 . The method of claim 24 , wherein transmitting the second control message comprises:
transmitting the second control message in a single transmission that includes the transmission configuration indicator codepoint and the indication of the bandwidth part identifier.
26 . A method for wireless communication at a user equipment (UE), comprising:
receiving, from a network entity, a radio resource control message that configures a set of transmission configuration indicator states, wherein each transmission configuration indicator state of the set of transmission configuration indicator states includes a respective transmission configuration indicator state identifier, a respective transmission configuration indicator state type, and a respective satellite beam identifier;
receiving, from the network entity, a control message that includes an indication of a transmission configuration indicator state identifier indicative that a transmission configuration indicator state of the set of transmission configuration indicator states is a satellite beam index type, wherein the control message further includes an indication of a satellite beam identifier; and
communicating with the network entity via a satellite beam that corresponds to the satellite beam identifier.
27 . The method of claim 26 , further comprising:
determining that the transmission configuration indicator state has a transmission configuration indicator state type that is the satellite beam index type.
28 . A method for wireless communication at a network entity, comprising:
transmitting a radio resource control message that configures a set of transmission configuration indicator states that include respective transmission configuration indicator state identifiers, respective transmission configuration indicator state types, and respective satellite beam identifiers;
transmitting a control message that includes an indication of a transmission configuration indicator state identifier indicative that a transmission configuration indicator state of the set of transmission configuration indicator states is a satellite beam index type, wherein the control message further includes an indication of a satellite beam identifier; and
communicating via a satellite beam that corresponds to the satellite beam identifier.
29 . The method of claim 28 , wherein transmitting the control message comprises:
transmitting the control message indicative of the transmission configuration indicator state that has a transmission configuration indicator state type that is the satellite beam index type.