Control signaling for sounding reference signal (SRS)
Described is an apparatus of a User Equipment (UE). The apparatus may comprise a first circuitry and a second circuitry. The first circuitry may be operable to process a message carrying an indicator to indicate a selection of a Sounding Reference Signal (SRS) resource set, wherein the message is received from a gNB. The second circuitry may be operable to generate an SRS transmission, based on the indicator. The apparatus may comprise an interface to send the SRS transmission to a transmission circuitry.
1. A User Equipment (UE) configured to communicate with a base station on a wireless network, the UE comprising:
one or more circuitries to:
process a message received from the base station carrying an indicator to indicate a selection of a Sounding Reference Signal (SRS) resource set, wherein the indicator indicates the SRS resource set is associated with a non-codebook based transmission or a codebook based transmission; and
generate an SRS transmission based on the indicator; and
an interface to send the SRS transmission to a transmission circuitry.
2. The UE of claim 1 , wherein the indicator is a 2-bit indicator.
3. The UE of claim 1 , wherein the indicator has one of: a first value indicating a selection of a first SRS resource set or a second value indicating a selection of a second SRS resource set.
4. The UE of claim 3 , wherein one or more of the first or second SRS resource sets are configured with higher layer parameters.
5. The UE of claim 3 , wherein the first SRS resource set is associated with one of: SRS for the non-codebook based transmission or SRS for the codebook band transmission.
6. The UE of claim 1 , wherein the message is a first message, and the one or more circuitries are further configured to:
process a second message received from the base station and carrying a second indicator to indicate that no SRS resource set transmission is to be triggered.
7. The UE of claim 6 , wherein the one or more circuitries are further configured to:
refrain from generating the SRS transmission, in response to the second message.
8. The UE of claim 1 , wherein:
the SRS transmission is a first SRS transmission,
the one or more circuitries are configured to generate a sequence of SRS transmissions including the first SRS transmission,
the interface is configured to send the sequence of SRS transmissions to the transmission circuitry, and
the one or more circuitries are further configured to process an Uplink (UL) grant that includes an SRS Resource Indicator (SRI), wherein the SRI is associated with a most recant SRS transmission of the sequence of SRS transmissions prior to receiving the SRI.
9. The UE of claim 1 , wherein:
the SRS transmission is a first SRS transmission,
the one or more circuitries are configured to generate a sequence of SRS transmissions including the first SRS transmission,
the interface is configured to send the sequence of SRS transmissions to the transmission circuitry,
the one or more circuitries are further configured to process an Uplink (UL) grant that Includes an SRS Resource indicator (SRI),
the SRI is received at the UE at a slot n, and
the SRI at the slot n is associated with a most recent SRS transmission of the sequence of SRS transmissions that is transmitted prior to the slot n.
10. The UE of claim 1 , wherein:
the message includes an indicator of a Bandwidth Part (BWP) spanning at least part of a bandwidth of a wireless communication channel between the UE and the base station, and
the indicator indicates the selection of the SRS resource set is for the BWP.
11. The UE of claim 1 , wherein the one or more circuitries are further configured to process a second message comprising a second indicator having one of: a first value indicating a selection of a first SRS resource sat associated with SRS for the non-codebook based transmission, a second value indicating a selection of a second SRS resource set associated with SRS for the codebook based transmission, or a third value indicating a selection of a third SRS resource set associated with SRS for Beam Management.
12. Non-transitory machine readable storage media having machine executable instructions that, when executed, cause one or more processors of a User Equipment (UE) configured to communicate with a base station on a wireless network to perform operations comprising:
processing a message received from the base station carrying an indicator to indicate a selection of a Sounding Reference Signal (SRS) resource set, wherein the indicator indicates the SRS resource set is associated with a non-codebook based transmission or a codebook based transmission;
generating an SRS transmission based on the indicator; and
sending the SRS transmission to a transmission circuitry, or transmission to the base station.
13. The non-transitory machine readable storage media of claim 12 , wherein the indicator is a 2-bit indicator.
14. The non-transitory machine readable storage media of claim 12 , wherein the indicator has one of: a first value indicating a selection of a first SRS resource set a second value indicating a selection of a second SRS resource set.
15. The non-transitory machine readable storage media of claim 14 , wherein one or more of the first or second SRS resource sets are configured with higher layer parameters.
16. The non-transitory machine readable storage media of claim 14 , wherein the first SRS resource set is associated with one of: SRS for the non-codebook based transmission or SRS for the codebook based transmission.
17. The non-transitory machine readable storage media of claim 12 , wherein the message is a first message, and the operations further comprise:
processing a second message carrying an indicator to indicate that no SRS resource set transmission is to be triggered, wherein the second message is received from the ha station; and
refraining from generating an SRS transmission, in response to the second message.
18. The non-transitory machine readable storage media of claim 12 , wherein the operations further comprise:
processing a second message comprising a second indicator having one or a first value indicating a selection of a first SRS resource set associated with SRS for the non-codebook based transmission, a second value indicating a selection of a second SRS resource set associated with SRS for the codebook based transmission, or a third value indicating a selection of a third SRS resource set associated with SRS for Beam Management.
19. The non-transitory machine readable storage media of claim 12 , wherein the SRS transmission is a first SRS transmission, and the operations further comprise:
generating a sequence of SRS transmissions including the first SRS transmission;
sending the sequence of SRS transmissions to the transmission circuitry; and
processing an Uplink (UL) grant that includes an SRS Resource Indicator (SRI), wherein the SRI is associated with a most recent SRS transmission of the sequence of SRS transmissions prior to receiving the SRI.
20. The non-transitory machine readable storage media of claim 12 , wherein the SRS transmission is a first SRS transmission, and the operations further comprise:
generating a sequence of SRS transmissions including the first SRS transmission;
sending the sequence of SRS transmissions to the transmission circuitry for transmission to the base station; and
processing an Uplink (UL) grant that includes an SRS Resource indicator (SRI),
wherein the SRI is received at the UE at a slat n, and
wherein the SRI at the slot n is associated with a most recent SRS transmission of the sequence of SRS transmissions that is transmitted prior to the slot n.
21. The non-transitory machine readable storage media claim 12 , wherein the message includes an indicator of a Bandwidth Part (BWP) spanning at least part of a bandwidth of a wireless communication channel between the UE and the base station and wherein the indicator indicates the selection of the SRS resource set is for the BWP.
22. A base station configured to communicate with a User Equipment (UE) on a wireless network, the base station comprising:
one or more circuitries to:
establish an indicator to indicate a selection of a Sounding Reference Signal (SRS) resource set to be transmitted by the UE to the base station; and
generate a message including the indicator, wherein the indicator indicates the SRS resource set is associated with a non-codebook based transmission or a codebook based transmission; and
an interface to send the message to a transmission circuitry, for transmission to the UE.
23. The base station apparatus of claim 22 , wherein:
the indicator has one of: a first value indicating a selection of a first SRS resource set associated with SRS for the non-codebook based transmission or a second value indicating a selection of a second SRS resource set associated with SRS for the codebook based transmission.
24. The base station of claim 22 , wherein:
the indicator is a first indicator,
the one or more circuitries are configured to generate a sequence of indicators including the first indicator, a second indicator, and a third indicator,
the first indicator is to indicate a selection of a first SRS resource set for Beam Management,
the second indicator is to indicate a selection of a second SRS resource set for codebook based transmission, and
the third indicator is to indicate a selection of a third SRS resource set for non-codebook based transmission.