Transmission of sounding reference signal (SRS) based on SRS transmit antenna port switching
The present application relates to devices and components including apparatus, systems, and methods to perform SRS transmission when a UE supports SRS Tx antenna port switching. In an example, a determination is made about whether a scheduled SRS transmission impacts a scheduled DL reception given the SRS Tx antenna port switching. If so, the SRS transmission and/or the DL reception are changed. In a further example, the UE can supports an SRS TA capability in conjunction with the SRS Tx antenna port switching capability. In this example, SRS TA can be applied to a scheduled SRS transmission.
1. A method comprising:
indicating, to a network, a capability of a user equipment (UE) to support sounding reference signal (SRS) antenna port switching and an impact of using the SRS antenna port switching to downlink reception;
receiving, from the network, data scheduling information;
receiving, from the network, SRS scheduling information to schedule an SRS transmission; and
performing, based on the impact and a determination that a collision is non-existent between a data communication and the SRS transmission, the SRS transmission using the SRS antenna port switching, the data communication scheduled based on the data scheduling information.
2. The method of claim 1 , wherein the SRS transmission is scheduled based on the UE having the capability to support the SRS antenna port switching.
3. The method of claim 1 , wherein the collision is non-existent between one or more symbols of the data communication and one or more SRS symbols of the SRS transmission.
4. The method of claim 1 , wherein the downlink reception and the SRS transmission are scheduled in different slots.
5. The method of claim 1 , wherein the downlink reception and the SRS transmission are scheduled in different slots, wherein the SRS transmission comprises an SRS symbol, and wherein the downlink reception comprises a reference signal.
6. The method of claim 1 , wherein downlink scheduling information schedules a set of downlink symbols, a set of downlink slots, or a set of downlink occasions, wherein the downlink reception is scheduled based on the downlink scheduling information and comprises high priority downlink data, a reference signal for layer 1 or layer 3measurement, or system information, wherein the SRS transmission comprises an SRS symbol.
7. The method of claim 1 , wherein the downlink reception and the SRS transmission are scheduled in different slots that are separated by at least a guard period.
8. The method of claim 1 , further comprising:
receiving at least one of: (i) an indication from the network about a change to the SRS transmission, wherein the change comprises rescheduling the SRS transmission or aborting the SRS transmission, or (ii) receiving an indication from the network about a rescheduling of the downlink reception or an abortion of the downlink reception.
9. The method of claim 1 , wherein the impact corresponds to a txSwitchImpactToRx parameter defined according to 3GPP technical specification.
10. The method of claim 1 , wherein the collision is between the data communication in a first slot of a first channel and the SRS transmission in a second slot of a second channel.
11. A base station comprising:
one or more processors; and
one or more memories storing computer-readable instructions that, upon execution by the one or more processors, configure the base station to:
receive, from a user equipment (UE), capability information indicating a capability of the UE to support sounding reference signal (SRS) antenna port switching and an impact of using the SRS antenna port switching to downlink reception;
transmit, to the UE, data scheduling information;
transmit, to the UE, SRS scheduling information to schedule an SRS transmission; and
receive the SRS transmission from the UE, wherein the SRS transmission is based on the impact a determination that a collision is non-existent between a data communication and the SRS transmission, wherein the SRS transmission uses the SRS antenna port switching, and wherein the data communication is scheduled based on the data scheduling information.
12. The base station of claim 11 , wherein a guard period exists between the data communication and the SRS transmission.
13. The base station of claim 11 , wherein the execution of the computer-readable instructions further configures the base station to:
receive, from the UE, additional UE capability information indicating that the UE lacks a capability of applying an SRS timing advance (TA) to the SRS transmission.
14. An apparatus comprising:
one or more processors; and
one or more memories storing computer-readable instructions that, upon execution by the one or more processors, configure the one or more processors to:
receive, from a network, information that schedules transmission of a sounding reference signal (SRS) symbol in a slot;
determine an SRS timing advance (TA) that is applicable to the transmission of the SRS symbol based on a total number of SRS symbols in the slot, a symbol number of the SRS symbol in the slot, a timing of a guard period of the SRS symbol in the slot or in an adjacent slot, or an overlap of the guard period with downlink reception; and
generate the SRS symbol for the transmission, the transmission being based on the determined SRS TA.
15. The apparatus of claim 14 , wherein the SRS TA is applicable to the transmission of the SRS symbol based on at least one of: the total number of SRS symbols in the slot exceeding a threshold number, the symbol number indicating that the SRS symbol is a first symbol or a last symbol of an SRS occasion in the slot, or the timing of the guard period indicating that the guard period is outside of the SRS occasion in the slot.
16. The apparatus of claim 14 , wherein the downlink reception and the transmission of the SRS symbol are scheduled in different slots, wherein the SRS TA is applicable to the transmission of the SRS symbol based on the overlap being between the downlink reception and the guard period or between the guard period and an uplink transmission that uses another slot.
17. The apparatus of claim 14 , of claim 14 , wherein the SRS TA has a value equal to a symbol length times a multiplier, wherein the symbol length is based on SRS subcarrier spacing (SCS), a physical uplink control channel (PUCCH) SCS, or a physical uplink shared channel (PUSCH) SCS.
18. The apparatus of claim 14 , wherein the execution of the computer-readable instructions further configures the one or more processors to:
determine that the total number of SRS symbols in the slot exceeds a threshold number;
and advance the transmission of the SRS symbols by a value of the SRS TA.
19. The apparatus of claim 14 , wherein the execution of the computer-readable instructions further configures the one or more processors to:
determine that the SRS symbol is either a first symbol or a last symbol of an SRS occasion of the slot; and
advance the transmission of the SRS symbol by a value of the SRS TA when the SRS symbol is the last symbol; or
delay the transmission of the SRS symbol by the value of the SRS TA when the SRS symbol is the first symbol.
20. The apparatus of claim 14 , wherein the execution of the computer-readable instructions further configures the one or more processors to:
determine that the guard period of the SRS symbol is either an eighth symbol of the slot or a first symbol of the adjacent slot; and
advance the transmission of the SRS symbol by a value of the SRS TA when the guard period is the first symbol of the adjacent slot; or
delay the transmission of the SRS symbol by the value of the SRS TA when the guard period is the eighth symbol of the slot.