Determining spatial direction for transmission and/or reception
Disclosed is a method comprising determining a spatial direction for a time interval between a first reference signal resource set in a first time slot and a second reference signal resource set in a second time slot; and transmitting one or more uplink transmissions and/or receiving one or more downlink transmissions according to the determined spatial direction during the time interval.
1 . An apparatus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
determine a spatial direction for a time interval between a first reference signal resource set in a first time slot and a second reference signal resource set in a second time slot; and
transmit one or more uplink transmissions and/or receive one or more downlink transmissions according to the determined spatial direction during the time interval.
2 . The apparatus according to claim 1 , wherein the apparatus is further caused to: determine, based at least partly on a time-domain location of a guard period, the spatial direction for the time interval.
3 . The apparatus according to claim 2 , wherein the time interval between the first reference signal resource set and the second reference signal resource set is larger than the guard period.
4 . The apparatus according to claim 2 , wherein the apparatus is further caused to:
switch, during the guard period, at least one of:
from a first transmission antenna panel to a second transmission antenna panel;
from a first reception antenna panel to a second reception antenna panel;
from spatial relation information associated with the first reference signal resource set to spatial relation information associated with the second reference signal resource set; or
from a transmission configuration indicator state associated with the first reference signal resource set to a transmission configuration indicator state associated with the second reference signal resource set.
5 . The apparatus according to claim 4 , wherein the spatial direction for the time interval is determined based at least partly on the spatial relation information and/or the transmission configuration indicator state associated with the second reference signal resource set, in response to the guard period being located after a last resource of the first reference signal resource set in the first time slot.
6 . The apparatus according to claim 4 , wherein the spatial direction for the time interval is determined based at least partly on the spatial relation information and/or the transmission configuration indicator state associated with the first reference signal resource set, in response to the guard period being located before a first resource of the second reference signal resource set in the second time slot.
7 . The apparatus according to claim 2 , wherein the apparatus is further caused to:
transmit, to a network element, an indication indicating at least one of a transmission capability set value or index for the apparatus, or a reception capability set value or index for the apparatus; and
receive, in response to transmitting the indication, a configuration indicating the time-domain location of the guard period.
8 . The apparatus according to claim 1 , wherein a resource of an uplink reference signal or a downlink reference signal is used as spatial relation information for either the first reference signal resource set or the second reference signal resource set,
and wherein the resource is used for determining the spatial direction for transmission and/or reception during the time interval.
9 . The apparatus according to claim 8 , wherein the downlink reference signal comprises a synchronization signal block.
10 . The apparatus according to claim 1 , wherein the apparatus is further caused to:
receive, from a network element, an indication indicating at least one of spatial relation information for the time interval, a downlink transmission configuration indicator state for the time interval, an uplink transmission configuration indicator state for the time interval, or a joint transmission configuration indicator state for downlink and uplink for the time interval; and
determine, based at least partly on the indication received from the terminal device, the spatial direction for the time interval.
11 . The apparatus according to claim 1 , wherein the first reference signal resource set comprises a first sounding reference signal resource set for antenna switching,
and wherein the second reference signal resource set comprises a second sounding reference signal resource set for antenna switching.
12 . An apparatus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:
indicate, to a terminal device, a spatial direction for a time interval between a first reference signal resource set in a first time slot and a second reference signal resource set in a second time slot; and
receive one or more uplink transmissions from the terminal device and/or transmit one or more downlink transmissions to the terminal device during the time interval.
13 . The apparatus according to claim 12 , wherein the apparatus is further caused to:
receive, from the terminal device, an indication indicating at least one of a transmission capability set value or index for the terminal device or a reception capability set value or index for the terminal device;
determine, based at least partly on the indication received from the terminal device, a time-domain location of a guard period; and
transmit, to the terminal device, a configuration indicating the time-domain location of the guard period, wherein the time-domain location of the guard period indicates the spatial direction for the time interval.
14 . The apparatus according to claim 12 , wherein the spatial direction is indicated by transmitting, to the terminal device, an indication indicating at least one of spatial relation information for the time interval, a downlink transmission configuration indicator state for the time interval, an uplink transmission configuration indicator state for the time interval, or a joint transmission configuration indicator state for downlink and uplink for the time interval.
15 . A method comprising:
determining, at a terminal device, a spatial direction for a time interval between a first reference signal resource set in a first time slot and a second reference signal resource set in a second time slot; and
transmitting, by the terminal device, one or more uplink transmissions and/or receiving, at the terminal device, one or more downlink transmissions according to the determined spatial direction during the time interval.
16 . The method according to claim 15 , wherein the method further comprises:
determining, based at least partly on a time-domain location of a guard period, the spatial direction for the time interval.
17 . The method according to claim 16 , wherein the time interval between the first reference signal resource set and the second reference signal resource set is larger than the guard period.
18 . The method according to claim 16 , wherein the method further comprises:
switching, during the guard period, at least one of:
from a first transmission antenna panel to a second transmission antenna panel;
from a first reception antenna panel to a second reception antenna panel;
from spatial relation information associated with the first reference signal resource set to spatial relation information associated with the second reference signal resource set; or
from a transmission configuration indicator state associated with the first reference signal resource set to a transmission configuration indicator state associated with the second reference signal resource set.
19 . The method according to claim 18 , wherein the spatial direction for the time interval is determined based at least partly on the spatial relation information and/or the transmission configuration indicator state associated with the second reference signal resource set, in response to the guard period being located after a last resource of the first reference signal resource set in the first time slot.
20 . The method according to claim 18 , wherein the spatial direction for the time interval is determined based at least partly on the spatial relation information and/or the transmission configuration indicator state associated with the first reference signal resource set, in response to the guard period being located before a first resource of the second reference signal resource set in the second time slot.