Techniques for initial sidelink beam forming
Certain aspects of the present disclosure provide techniques for wireless communication. An example method includes receiving configuration information indicating one or more configurations for an initial sidelink beamforming procedure involving one or more transmit beams, each associated with a respective antenna panel of a first UE, and performing the initial sidelink beamforming procedure based on the configuration information. Performing the initial sidelink beamforming procedure includes transmitting at least a first beamforming burst, comprising transmitting each beamforming transmission of one or more beamforming transmissions using a different respective transmit beam of the one or more transmit beams of one or more antenna panels of a first UE, monitoring for at least one response message from a second UE responding to at least one of the one or more beamforming transmissions, and taking one or more actions based on the monitoring.
1 . An apparatus for wireless communication at a first user equipment (UE), comprising:
one or more processors, individually or collectively, configured to execute instructions stored on one or more memories and to cause the first UE to:
receive, from a network entity, configuration information indicating one or more configurations for an initial sidelink beamforming procedure involving one or more transmit beams of the first UE, each of the transmit beams associated with a respective antenna panel of the first UE, wherein the one or more configurations each include a respective indication of at least a burst duration for transmitting one or more beamforming bursts;
receive, from the network entity, control information indicating:
a set of time-frequency resources for transmitting a first beamforming burst of the initial sidelink beamforming procedure; and
a set of time-frequency resources for monitoring for at least one response message based on the first beamforming burst; and
perform, based on the configuration information, the initial sidelink beamforming procedure, wherein in order to perform the initial sidelink beamforming procedure, the one or more processors are configured to cause the first UE to:
transmit at least the first beamforming burst comprising one or more beamforming transmissions, each of the one or more beamforming transmissions transmitted using a different respective transmit beam of the one or more transmit beams of one or more antenna panels of the first UE;
monitor for at least one response message from a second UE responding to at least one of the one or more beamforming transmissions; and
take one or more actions based on the monitoring, wherein the indication of the set of time-frequency resources for transmitting the first beamforming burst comprises:
a first subset of time-frequency resources of the set of time-frequency resources for transmitting a first beamforming transmission of the first beamforming burst using a first transmit beam of the different respective transmit beams of a first antenna panel of the one or more antenna panels of the first UE;
a first time interval between adjacent beamforming transmissions, of the first beamforming burst, to be transmitted using the different respective transmit beams of the first antenna panel;
a first number of the different respective transmit beams of the first antenna panel; and
a first configuration information index indicating a first configuration of the one or more configurations in the configuration information.
2 . The apparatus of claim 1 , wherein the one or more beamforming transmissions comprise at least one of one or more physical sidelink shared channel (PSSCH) transmissions or one or more sidelink reference signal blocks (S-RSBs).
3 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first UE to transmit, to the network entity, sidelink assistance information, wherein the configuration information for the initial sidelink beamforming procedure is based on the sidelink assistance information.
4 . The apparatus of claim 3 , wherein the sidelink assistance information comprises at least one of:
a number of antenna panels of the one or more antenna panels of the first UE;
a number of transmit beams per antenna panel of the one or more antenna panels of the first UE;
one or more transmit beam types supported by the one or more antenna panels of the first UE; or
one or more beamforming burst parameters, including at least one of a duration for transmitting a beamforming burst or a period or time interval between beamforming bursts.
5 . The apparatus of claim 1 , wherein the one or more configurations each further include a respective indication of at least one of:
a period or time interval between beamforming bursts;
a number of antenna panels to use for transmitting one or more beamforming bursts;
a number of transmit beams per antenna panel of the one or more antenna panels of the first UE to use for transmitting one or more beamforming bursts;
a total number of transmit beams, across all antenna panels of the one or more antenna panels of the first UE, to use for transmitting one or more beamforming bursts;
a type of transmit beam of the one or more antenna panels to use for transmitting one or more beamforming bursts; or
a number of beamforming bursts to transmit.
6 . The apparatus of claim 1 , wherein, in order to transmit at least the first beamforming burst, the one or more processors are configured to cause the first UE to:
transmit, in the first subset of time-frequency resources, the first beamforming transmission via the first transmit beam of the first antenna panel based on the first configuration; and
transmit, based on the first configuration, at least a second beamforming transmission using a second transmit beam of the different respective transmit beams of the first antenna panel in a second subset of time-frequency resources of the set of time-frequency resources after the first time interval following transmission of the first beamforming transmission.
7 . The apparatus of claim 6 , wherein the indication of the set of time-frequency resources for transmitting the first beamforming burst comprises:
a third subset of time-frequency resources of the set of time-frequency resources for transmitting a third beamforming transmission of the first beamforming burst using a third transmit beam of the different respective transmit beams of a second antenna panel of the one or more antenna panels of the first UE;
a second time interval between adjacent beamforming transmissions, of the first beamforming burst, to be transmitted using the different respective transmit beams of the second antenna panel; and
a second number of the different respective transmit beams of the second antenna panel; and
a second configuration information index indicating a second configuration of the one or more configurations in the configuration information.
8 . The apparatus of claim 7 , wherein, in order to transmit at least the first beamforming burst, the one or more processors are configured to cause the first UE to:
transmit, using the third subset of time-frequency resources, the third beamforming transmission via the third transmit beam of the second antenna panel based on the second configuration; and
transmit, based on the second configuration, at least a fourth beamforming transmission using a fourth transmit beam of the different respective transmit beams of the second antenna panel in a fourth subset of time-frequency resources of the set of time-frequency resources after the second time interval following transmission of the third beamforming transmission.
9 . The apparatus of claim 1 , wherein the set of time-frequency resources for transmitting the first beamforming burst comprises a set of semi-static time-frequency resources for transmitting at least first beamforming burst.
10 . The apparatus of claim 9 , wherein the control information indicating the set of time-frequency resources is received in at least one of the configuration information or an activation message for one or more configured grants.
11 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the first UE to transmit, to the network entity, a request indicating the first UE has one or more beamforming bursts to transmit.
12 . The apparatus of claim 11 , wherein:
the control information is received based on the request indicating the first UE has one or more beamforming bursts to transmit; and
the control information is received in a downlink control information (DCI) message.
13 . The apparatus of claim 12 , wherein, in order to take the one or more actions, the one or more processors are configured to cause the first UE to transmit, to the network entity, feedback information associated with the DCI message.
14 . The apparatus of claim 13 , wherein:
the DCI message further includes a feedback timing indicator indicating a time to transmit the feedback information associated with the DCI message; and
the one or more processors are configured to cause the first UE to transmit the feedback information based on the feedback timing indicator.
15 . The apparatus of claim 13 , wherein the feedback information includes one of:
an acknowledgement (ACK) configured to indicate to the network entity that another beamforming burst is not necessary; or
a negative acknowledgement (NACK) configured to indicate to the network entity that transmission of at least a second beamforming burst is requested.
16 . The apparatus of claim 15 , wherein, in order to take the one or more actions, the one or more processors are configured to cause the first UE to:
include the NACK in the feedback information;
receive, based on the NACK, a second DCI indicating resources for transmitting a second beamforming burst; and
transmit the second beamforming burst based on the indicated resources for transmitting the second beamforming burst.
17 . The apparatus of claim 16 , wherein the one or more processors are configured to cause the first UE to include the NACK in the feedback information based on one of:
receiving, based on the monitoring, the at least one response message from the second UE indicating to transmit the second beamforming burst based on the set of time-frequency resources for monitoring for the at least one response message; or
not receiving, based on the monitoring, the at least one response message from the second UE, responding to at least one beamforming transmission of the one or more beamforming transmissions, within a threshold amount of time.
18 . The apparatus of claim 15 , wherein, in order to take the one or more actions, the one or more processors are further configured to cause the first UE to include the ACK in the feedback information based on receiving, based on the monitoring and on the set of time-frequency resources for monitoring for the at least one response message, the at least one response message from the second UE indicating a beam pair link between one of the one or more transmit beams of the first UE and a receive beam of the second UE.
19 . An apparatus for wireless communication at a network entity, comprising:
one or more processors, individually or collectively, configured to execute instructions stored on one or more memories and to cause the network entity to:
receive sidelink assistance information of a first user equipment (UE); and
transmit, to the UE based on the sidelink assistance information, configuration information indicating one or more configurations for an initial sidelink beamforming procedure involving transmission of at least a first beamforming burst including one or more beamforming transmissions, wherein the one or more configurations each include a respective indication of at least a burst duration for transmitting one or more beamforming bursts, including at least the first beamforming burst; and
transmit, to the first UE, control information indicating:
a set of time-frequency resources for transmitting the first beamforming burst; and
a set of time-frequency resources for monitoring for at least one response message based on the first beamforming burst, wherein the indication of the set of time-frequency resources for transmitting the first beamforming burst comprises:
a first subset of time-frequency resources of the set of time-frequency resources for transmitting a first beamforming transmission of the first beamforming burst using a first transmit beam of a first antenna panel of the UE;
a first time interval between adjacent beamforming transmissions, of the first beamforming burst, to be transmitted using different respective transmit beams of the first antenna panel;
a first number of the different respective transmit beams of the first antenna panel; and
a first configuration information index indicating a first configuration of the one or more configurations in the configuration information.
20 . The apparatus of claim 19 , wherein:
the one or more beamforming transmissions comprise at least one of one or more physical sidelink shared channel (PSSCH) transmissions or one or more sidelink reference signal blocks (S-RSBs); and
the sidelink assistance information comprises at least one of:
a number of antenna panels of one or more antenna panels of the first UE;
a number of transmit beams per antenna panel of one or more antenna panels of the first UE;
one or more transmit beam types supported by one or more antenna panels of the first UE; or
one or more beamforming burst parameters, including at least one of a duration for transmitting a beamforming burst or a period or time interval between beamforming bursts.
21 . The apparatus of claim 19 , wherein the one or more configurations each further include a respective indication of at least one of:
a period or time interval between beamforming bursts;
a number of antenna panels to use for transmitting one or more beamforming bursts;
a number of transmit beams per antenna panel of one or more antenna panels of the first UE to use for transmitting one or more beamforming bursts;
a total number of transmit beams, across all antenna panels of one or more antenna panels of the first UE, to use for transmitting one or more beamforming bursts;
a type of transmit beam of one or more antenna panels to use for transmitting one or more beamforming bursts; or
a number of beamforming bursts to transmit.
22 . The apparatus of claim 19 , wherein the indication of the set of time-frequency resources for transmitting the first beamforming burst further comprises:
a second subset of time-frequency resources of the set of time-frequency resources for transmitting a second beamforming transmission of the first beamforming burst using a second transmit beam of a second antenna panel of the UE;
a second time interval between adjacent beamforming transmissions, of the first beamforming burst, to be transmitted using different respective transmit beams of the second antenna panel; and
a second number of the different respective transmit beams of the second antenna panel; and
a second configuration information index indicating a second configuration of the one or more configurations in the configuration information.
23 . The apparatus of claim 19 , wherein:
the set of time-frequency resources for transmitting the first beamforming burst comprises a set of semi-static time-frequency resources for transmitting at least first beamforming burst; and
the control information indicating the set of time-frequency resources is transmitted in at least one of the configuration information or an activation message for one or more configured grants.
24 . The apparatus of claim 19 , wherein:
the one or more processors are further configured to cause the network entity to receive, from the first UE, a request indicating the first UE has one or more beamforming bursts to transmit, wherein:
the one or more processors are configured to cause the network entity to transmit the control information in a downlink control information (DCI) message based on the request indicating the first UE has one or more beamforming bursts to transmit;
the one or more processors are further configured to cause the network entity to receive, from the UE, feedback information associated with the DCI message;
the DCI message further includes a feedback timing indicator indicating a time to transmit the feedback information associated with the DCI message; and
the one or more processors are further configured to cause the network entity to receive the feedback information based on the feedback timing indicator.
25 . The apparatus of claim 24 , wherein the feedback information includes one of:
an acknowledgement (ACK) configured to indicate to the network entity that another beamforming burst is not necessary; or
a negative acknowledgement (NACK) configured to indicate to the network entity that transmission of at least a second beamforming burst is requested.
26 . A method for wireless communication at a first user equipment (UE), comprising:
receiving, from a network entity, configuration information indicating one or more configurations for an initial sidelink beamforming procedure involving one or more transmit beams of the first UE, each of the transmit beams associated with a respective antenna panel of the first UE; and
receiving, from the network entity, control information indicating:
a set of time-frequency resources for transmitting a first beamforming burst of the initial sidelink beamforming procedure; and
a set of time-frequency resources for monitoring for at least one response message based on the first beamforming burst; and
performing, based on the configuration information, the initial sidelink beamforming procedure, comprising:
transmitting at least a first beamforming burst comprising one or more beamforming transmissions, each of the one or more beamforming transmissions transmitted using a different respective transmit beam of the one or more transmit beams of one or more antenna panels of the first UE;
monitoring for at least one response message from a second UE responding to at least one of the one or more beamforming transmissions; and
taking one or more actions based on the monitoring, wherein the indication of the set of time-frequency resources for transmitting the first beamforming burst comprises:
a first subset of time-frequency resources of the set of time-frequency resources for transmitting a first beamforming transmission of the first beamforming burst using a first transmit beam of the different respective transmit beams of a first antenna panel of the one or more antenna panels of the first UE;
a first time interval between adjacent beamforming transmissions, of the first beamforming burst, to be transmitted using the different respective transmit beams of the first antenna panel;
a first number of the different respective transmit beams of the first antenna panel; and
a first configuration information index indicating a first configuration of the one or more configurations in the configuration information.
27 . A method for wireless communication at a network entity, comprising:
receiving sidelink assistance information of a first user equipment (UE);
transmitting, to the UE based on the sidelink assistance information, configuration information indicating one or more configurations for an initial sidelink beamforming procedure involving transmission of at least a first beamforming burst including one or more beamforming transmissions, wherein the one or more configurations each include a respective indication of at least a burst duration for transmitting one or more beamforming bursts, including at least the first beamforming burst; and
transmitting, to the first UE, control information indicating:
a set of time-frequency resources for transmitting the first beamforming burst; and
a set of time-frequency resources for monitoring for at least one response message based on the first beamforming burst, wherein the indication of the set of time-frequency resources for transmitting the first beamforming burst comprises:
a first subset of time-frequency resources of the set of time-frequency resources for transmitting a first beamforming transmission of the first beamforming burst using a first transmit beam of a first antenna panel of the UE;
a first time interval between adjacent beamforming transmissions, of the first beamforming burst, to be transmitted using different respective transmit beams of the first antenna panel;
a first number of the different respective transmit beams of the first antenna panel; and
a first configuration information index indicating a first configuration of the one or more configurations in the configuration information.