Aligning application time of MAC-CE-based actions for multiple user equipments
Certain aspects of the present disclosure provide techniques for techniques for determining when to perform medium access control (MAC) control element (CE) (MAC-CE) triggered actions across multiple user equipments (UEs). A method includes receiving a MAC-CE comprising an indication to perform one or more actions and an indication of an absolute application time; and based on receiving the MAC-CE, perform the one or more actions at the absolute application time.
1 . An apparatus configured for wireless communications, comprising one or more processors, coupled to one or more memories, and configured to cause the apparatus to:
receive a medium access control element (MAC-CE) comprising an indication to perform one or more actions;
transmit a hybrid automatic repeat request (HARQ) acknowledgement (ACK) transmission based on receiving the MAC-CE;
determine an application time for performing the one or more actions based on a number of hybrid automatic repeat request (HARQ) transmissions transmitted in response to the MAC-CE, including the HARQ ACK transmission; and
perform the one or more actions at the application time,
wherein the one or more processors are configured to cause the apparatus to determine the application time for performing the one or more actions further based on:
a transmission interval measured between each HARQ transmission scheduled for use by the apparatus in response to the MAC-CE;
a maximum application time associated with the apparatus; and
an offset from a time when the HARQ ACK transmission is transmitted,
wherein the offset is the maximum application time associated with the apparatus minus a product of the transmission interval measured between each HARQ transmission and the number of HARQ transmissions minus one.
2 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the apparatus to, prior to transmission of the HARQ ACK transmission, receive downlink control information (DCI) scheduling the HARQ ACK transmission.
3 . The apparatus of claim 2 , wherein:
the DCI scheduling the HARQ ACK transmission comprises an indication of the number of HARQ transmissions, and
the one or more processors are configured to cause the apparatus to determine the number of HARQ transmissions based on the indication of the number of HARQ transmissions.
4 . The apparatus of claim 3 , wherein the indication of the number of HARQ transmissions included in the DCI comprises a redundancy version (RV) value associated with an RV pattern associated with HARQ transmissions for the MAC-CE.
5 . The apparatus of claim 4 , wherein the one or more processors are configured to cause the apparatus to receive an indication of the RV pattern associated with the HARQ transmissions for the MAC-CE.
6 . The apparatus of claim 3 , wherein the indication of the number of HARQ transmissions is explicitly indicated in the DCI.
7 . The apparatus of claim 1 , wherein the MAC-CE further comprises an indication of the transmission interval measured between each HARQ transmission scheduled for use by the apparatus for the MAC-CE.
8 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the apparatus to, prior to transmission of the HARQ ACK transmission, receive an indication of the transmission interval measured between each HARQ transmission in an RRC message.
9 . The apparatus of claim 1 , wherein the maximum application time is configured based on at least one of:
a number of HARQ transmissions scheduled for use by the apparatus in response to the MAC-CE,
a transmission interval measured between each HARQ transmission scheduled for use by the apparatus in response to the MAC-CE,
a number of HARQ transmissions scheduled for use by each of one or more other apparatuses in response to the MAC-CE,
a transmission interval measured between each HARQ transmission scheduled for use by each of the one or more other apparatuses in response to the MAC-CE, or
a time difference between a first HARQ transmission scheduled for use by the apparatus for the MAC-CE and a first HARQ transmission scheduled for use by at least one of the one or more other apparatuses in response to the MAC-CE.
10 . The apparatus of claim 1 , wherein the MAC-CE further comprises an indication of the maximum application time associated with the apparatus.
11 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the apparatus to, prior to transmission of the HARQ ACK transmission, receive an indication of the maximum application time associated with the apparatus in an RRC message.
12 . The apparatus of claim 1 , wherein the one or more actions comprise at least one of:
a secondary cell activation or deactivation,
a transmission configuration indication (TCI) state switch,
an uplink spatial relation switch, or
configuring a timing advance.
13 . The apparatus of claim 1 , wherein the one or more processors are configured to cause the apparatus to receive the MAC-CE via multicast signaling.
14 . An apparatus configured for wireless communications, comprising one or more processors, coupled to one or more memories, and configured to cause the apparatus to:
transmit, to a user equipment (UE), a medium access control element (MAC-CE) comprising an indication to perform one or more actions;
receive, from the UE, a hybrid automatic repeat request (HARQ) acknowledgement (ACK) transmission in response to the MAC-CE;
determine an application time for performing the one or more actions based on a timing when a first HARQ transmission was received in response to the MAC-CE from the UE and a maximum application time associated with the UE; and
perform the one or more actions at the application time,
wherein the application time is based on:
a transmission interval measured between each HARQ transmission scheduled for use by the UE in response to the MAC-CE;
a maximum application time associated with the UE; and
an offset from a time when the HARQ ACK transmission is transmitted,
wherein the offset is the maximum application time associated with the UE minus a product of the transmission interval measured between each HARQ transmission and the number of HARQ transmissions minus one.
15 . A method for wireless communications, comprising:
receiving a medium access control element (MAC-CE) comprising an indication to perform one or more actions;
transmitting a hybrid automatic repeat request (HARQ) acknowledgement (ACK) transmission based on receiving the MAC-CE;
determining an application time for performing the one or more actions based on a number of hybrid automatic repeat request (HARQ) transmissions transmitted in response to the MAC-CE, including the HARQ ACK transmission; and
performing the one or more actions at the application time,
wherein the one or more processors are configured to cause the apparatus to determine the application time for performing the one or more actions further based on:
a transmission interval measured between each HARQ transmission scheduled for use by the apparatus in response to the MAC-CE;
a maximum application time associated with the apparatus; and
an offset from a time when the HARQ ACK transmission is transmitted,
wherein the offset is the maximum application time associated with the apparatus minus a product of the transmission interval measured between each HARQ transmission and the number of HARQ transmissions minus one.
16 . The method of claim 15 , comprising: prior to transmitting the HARQ ACK transmission, receiving downlink control information (DCI) scheduling the HARQ ACK transmission.
17 . The method of claim 16 , wherein:
the DCI scheduling the HARQ ACK transmission comprises an indication of the number of HARQ transmissions, and
the method comprises determining the number of HARQ transmissions based on the indication of the number of HARQ transmissions.
18 . The method of claim 17 , wherein the indication of the number of HARQ transmissions included in the DCI comprises a redundancy version (RV) value associated with an RV pattern associated with HARQ transmissions for the MAC-CE.
19 . The method of claim 18 , wherein the method comprises receiving an indication of the RV pattern associated with the HARQ transmissions for the MAC-CE.
20 . The method of claim 17 , wherein the indication of the number of HARQ transmissions is explicitly indicated in the DCI.
21 . The method of claim 15 , wherein the MAC-CE further comprises an indication of the transmission interval measured between each HARQ transmission scheduled for use by the apparatus for the MAC-CE.
22 . The method of claim 15 , wherein the method comprises, prior to transmitting the HARQ ACK transmission, receiving an indication of the transmission interval measured between each HARQ transmission in an RRC message.
23 . The method of claim 15 , wherein the maximum application time is configured based on at least one of:
a number of HARQ transmissions scheduled for use by the apparatus in response to the MAC-CE,
a transmission interval measured between each HARQ transmission scheduled for use by the apparatus in response to the MAC-CE,
a number of HARQ transmissions scheduled for use by each of one or more other apparatuses in response to the MAC-CE,
a transmission interval measured between each HARQ transmission scheduled for use by each of the one or more other apparatuses in response to the MAC-CE, or
a time difference between a first HARQ transmission scheduled for use by the apparatus for the MAC-CE and a first HARQ transmission scheduled for use by at least one of the one or more other apparatuses in response to the MAC-CE.
24 . The method of claim 15 , wherein the MAC-CE further comprises an indication of the maximum application time associated with the apparatus.
25 . The method of claim 15 , wherein the method comprises, prior to transmitting the HARQ ACK transmission, receiving an indication of the maximum application time associated with the apparatus in an RRC message.
26 . The method of claim 15 , wherein the one or more actions comprise at least one of:
a secondary cell activation or deactivation,
a transmission configuration indication (TCI) state switch,
an uplink spatial relation switch, or
configuring a timing advance.
27 . The method of claim 15 , wherein the method comprises receiving the MAC-CE via multicast signaling.
28 . A method for wireless communications, comprising:
transmitting, to a user equipment (UE), a medium access control element (MAC-CE) comprising an indication to perform one or more actions;
receiving, from the UE, a hybrid automatic repeat request acknowledgement (ACK) transmission in response to the MAC-CE;
determining an application time for performing the one or more actions based on a timing when a first HARQ transmission was received in response to the MAC-CE from the UE and a maximum application time associated with the UE; and
performing the one or more actions at the application time,
wherein the application time is based on:
a transmission interval measured between each HARQ transmission scheduled for use by the UE in response to the MAC-CE;
a maximum application time associated with the UE; and
an offset from a time when the HARQ ACK transmission is transmitted,
wherein the offset is the maximum application time associated with the UE minus a product of the transmission interval measured between each HARQ transmission and the number of HARQ transmissions minus one.