System and method for mapping sounding reference signals to resources
A user equipment (UE) may receive, from a base station, a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, and each of the at least two resource allocations may include a time resource allocation and a frequency resource allocation. The UE may further transmit, to the base station, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource. The base station may transmit, to the UE, the SRS configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, and receive, from the UE, the SRS on a respective SRS resource of the SRS resource set based on the one of the at least two resource allocations for the respective SRS resource.
1 . A method of wireless communication by a user equipment (UE), comprising:
receiving, from a base station, a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation;
based on a determination that an information configuring selection is not received, selecting the one of the at least two resource allocations for the respective SRS resource based on a default selection that is preconfigured; and
transmitting, to the base station, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
2 . The method of claim 1 , wherein the time resource allocation of each of the at least two resource allocations is configured with one or more of a start position, a number of symbols, or a repetition factor associated with resource mapping of the respective SRS resource.
3 . The method of claim 1 , wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured without frequency hopping, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with frequency hopping.
4 . The method of claim 3 , wherein the frequency resource allocation of each of the at least two resource allocations is further configured with one or more of a frequency domain position or a frequency domain shift associated with resource mapping of the respective SRS resource.
5 . The method of claim 1 , further comprising:
receiving, from the base station, information configuring selection of the one of the at least two resource allocations,
wherein the one of the at least two resource allocations is selected based on the information configuring selection.
6 . The method of claim 5 , wherein the information configuring selection of the one of the at least two resource allocations comprises a trigger value associated with aperiodic SRS transmission.
7 . The method of claim 6 , wherein the trigger value has a one-to-one association with the one of the at least two resource allocations for each SRS resource of the SRS resource set.
8 . The method of claim 5 , wherein the information configuring selection comprises downlink control information (DCI).
9 . The method of claim 8 , wherein the DCI comprises at least one code point, and the at least one code point indicates the information configuring selection of the one of the at least two resource allocations.
10 . The method of claim 9 , wherein the at least one code point further triggers the transmitting of the SRS on the respective SRS resource of the SRS resource set.
11 . The method of claim 8 , wherein the DCI comprises one of DCI scheduling information for the UE, DCI from which the scheduling information is absent, or DCI that is groupcast.
12 . The method of claim 11 , wherein the DCI from which the scheduling information is absent comprises a set of bit fields associated with scheduling data, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the set of bit fields associated with scheduling data.
13 . The method of claim 11 , wherein the DCI scheduling information for the UE comprises at least one code point associated with at least one of a time-domain resource allocation or a frequency-domain resource allocation, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is indicated by the at least one code point associated with the at least one of the time-domain resource allocation or the frequency-domain resource allocation.
14 . The method of claim 11 , wherein the DCI that is groupcast comprises a block of bits assigned to the UE, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the block of bits assigned to the UE.
15 . The method of claim 8 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a wideband resource allocation when the SRS on the respective SRS resource of the SRS resource set is jointly triggered based on an aperiodic CSI request included in the DCI.
16 . The method of claim 10 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a default resource allocation when the SRS on the respective SRS resource of the SRS resource set is triggered based on an independent SRS trigger included in the DCI.
17 . A method of wireless communication by a base station, comprising:
transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation; and
receiving, from the UE, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource, wherein the one of the two at least two resource allocations for the respective SRS resource is selected based on a default selection that is preconfigured,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
18 . The method of claim 17 , wherein the time resource allocation of each of the at least two resource allocations comprises one or more of a start position, a number of symbols, or a repetition factor associated with resource mapping of the respective SRS resource.
19 . The method of claim 17 , wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured without frequency hopping, and another of the at least two resource allocations for the respective SRS resource is configured with frequency hopping.
20 . The method of claim 19 , wherein the frequency resource allocation of each of the at least two resource allocations is further configured with one or more of a frequency domain position or a frequency domain shift associated with resource mapping of the respective SRS resource.
21 . The method of claim 17 , further comprising:
transmitting, to the UE, information configuring selection of the one of the at least two resource allocations,
wherein the SRS is received using the one of the at least two resource allocations based on the information configuring selection.
22 . The method of claim 21 , wherein the information configuring selection comprises downlink control information (DCI).
23 . The method of claim 22 , wherein the DCI comprises at least one code point, and the at least one code point indicates the information configuring selection of the one of the at least two resource allocations.
24 . The method of claim 23 , wherein the at least one code point further triggers the transmitting of the SRS on the respective SRS resource of the SRS resource set, and the SRS resource set is aperiodic.
25 . The method of claim 22 , wherein the DCI comprises one of DCI scheduling information for the UE, DCI from which the scheduling information is absent, or DCI that is groupcast.
26 . The method of claim 25 , wherein the DCI from which the scheduling information is absent comprises a set of bit fields associated with scheduling data, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the set of bit fields associated with scheduling data.
27 . The method of claim 25 , wherein the DCI scheduling information for the UE comprises at least one code point associated with at least one of a time-domain resource allocation or a frequency-domain resource allocation, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is indicated by the at least one code point associated with the at least one of the time-domain resource allocation or the frequency-domain resource allocation.
28 . The method of claim 25 , wherein the DCI that is groupcast comprises a block of bits assigned to the UE, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the block of bits assigned to the UE.
29 . The method of claim 22 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a default resource allocation when the SRS on the respective SRS resource of the SRS resource set is triggered based on an independent SRS trigger included in the DCI.
30 . The method of claim 22 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a wideband resource allocation when the SRS on the respective SRS resource of the SRS resource set is jointly triggered based on an aperiodic CSI request included in the DCI.
31 . An apparatus for wireless communication by a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, from a base station, a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation;
based on a determination that an information configuring selection is not received, select the one of the at least two resource allocations for the respective SRS resource based on a default selection that is preconfigured; and
transmit, to the base station, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
32 . The apparatus of claim 31 , wherein the time resource allocation of each of the at least two resource allocations is configured with one or more of a start position, a number of symbols, or a repetition factor associated with resource mapping of the respective SRS resource.
33 . The apparatus of claim 31 , wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured without frequency hopping, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with frequency hopping.
34 . The apparatus of claim 33 , wherein the frequency resource allocation of each of the at least two resource allocations is further configured with one or more of a frequency domain position or a frequency domain shift associated with resource mapping of the respective SRS resource.
35 . The apparatus of claim 31 , wherein the at least one processor is further configured to:
receive, from the base station, information configuring selection of the one of the at least two resource allocations,
wherein the one of the at least two resource allocations is selected based on the information configuring selection.
36 . The apparatus of claim 35 , wherein the information configuring selection of the one of the at least two resource allocations comprises a trigger value associated with aperiodic SRS transmission.
37 . The apparatus of claim 36 , wherein the trigger value has a one-to-one association with the one of the at least two resource allocations for each SRS resource of the SRS resource set.
38 . The apparatus of claim 35 , wherein the information configuring selection comprises downlink control information (DCI).
39 . The apparatus of claim 38 , wherein the DCI comprises at least one code point, and the at least one code point indicates the information configuring selection of the one of the at least two resource allocations.
40 . The apparatus of claim 39 , wherein the at least one code point further triggers the transmission of the SRS on the respective SRS resource of the SRS resource set.
41 . The apparatus of claim 38 , wherein the DCI comprises one of DCI scheduling information for the UE, DCI from which the scheduling information is absent, or DCI that is groupcast.
42 . The apparatus of claim 41 , wherein the DCI from which the scheduling information is absent comprises a set of bit fields associated with scheduling data, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the set of bit fields associated with scheduling data.
43 . The apparatus of claim 41 , wherein the DCI scheduling information for the UE comprises at least one code point associated with at least one of a time-domain resource allocation or a frequency-domain resource allocation, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is indicated by the at least one code point associated with the at least one of the time-domain resource allocation or the frequency-domain resource allocation.
44 . The apparatus of claim 41 , wherein the DCI that is groupcast comprises a block of bits assigned to the UE, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the block of bits assigned to the UE.
45 . The apparatus of claim 38 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a wideband resource allocation when the SRS on the respective SRS resource of the SRS resource set is jointly triggered based on an aperiodic CSI request included in the DCI.
46 . The apparatus of claim 40 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a default resource allocation when the SRS on the respective SRS resource of the SRS resource set is triggered based on an independent SRS trigger included in the DCI.
47 . An apparatus for wireless communication by a base station, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation; and
receive, from the UE, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource, wherein the one of the two at least two resource allocations for the respective SRS resource is selected based on a default selection that is preconfigured,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
48 . The apparatus of claim 47 , wherein the time resource allocation of each of the at least two resource allocations comprises one or more of a start position, a number of symbols, or a repetition factor associated with resource mapping of the respective SRS resource.
49 . The apparatus of claim 47 , wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured without frequency hopping, and another of the at least two resource allocations for the respective SRS resource is configured with frequency hopping.
50 . The apparatus of claim 48 , wherein the frequency resource allocation of each of the at least two resource allocations is further configured with one or more of a frequency domain position or a frequency domain shift associated with resource mapping of the respective SRS resource.
51 . The apparatus of claim 47 , wherein the at least one processor is further configured to:
transmit, to the UE, information configuring selection of the one of the at least two resource allocations,
wherein the SRS is received using the one of the at least two resource allocations based on the information configuring selection.
52 . The apparatus of claim 51 , wherein the information configuring selection comprises downlink control information (DCI).
53 . The apparatus of claim 52 , wherein the DCI comprises at least one code point, and the at least one code point indicates the information configuring selection of the one of the at least two resource allocations.
54 . The apparatus of claim 53 , wherein the at least one code point further triggers the transmission of the SRS on the respective SRS resource of the SRS resource set, and the SRS resource set is aperiodic.
55 . The apparatus of claim 52 , wherein the DCI comprises one of DCI scheduling information for the UE, DCI from which the scheduling information is absent, or DCI that is groupcast.
56 . The apparatus of claim 55 , wherein the DCI from which the scheduling information is absent comprises a set of bit fields associated with scheduling data, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the set of bit fields associated with scheduling data.
57 . The apparatus of claim 55 , wherein the DCI scheduling information for the UE comprises at least one code point associated with at least one of a time-domain resource allocation or a frequency-domain resource allocation, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is indicated by the at least one code point associated with the at least one of the time-domain resource allocation or the frequency-domain resource allocation.
58 . The apparatus of claim 55 , wherein the DCI that is groupcast comprises a block of bits assigned to the UE, and at least one code point indicating the information configuring selection of the one of the at least two resource allocations is included in the block of bits assigned to the UE.
59 . The apparatus of claim 52 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a default resource allocation when the SRS on the respective SRS resource of the SRS resource set is triggered based on an independent SRS trigger included in the DCI.
60 . The apparatus of claim 52 , wherein the information configuring selection of the one of the at least two resource allocations for the respective SRS resource indicates the one of the at least two resource allocations is a wideband resource allocation when the SRS on the respective SRS resource of the SRS resource set is jointly triggered based on an aperiodic CSI request included in the DCI.
61 . An apparatus for wireless communication by a user equipment (UE), comprising:
means for receiving, from a base station, a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation;
means for based on a determination that an information configuring selection is not received, selecting the one of the at least two resource allocations for the respective SRS resource based on a default selection that is preconfigured; and
means for transmitting, to the base station, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
62 . An apparatus for wireless communication by a base station, comprising:
means for transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation; and
means for receiving, from the UE, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource, wherein the one of the two at least two resource allocations for the respective SRS resource is selected based on a default selection that is preconfigured,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
63 . A non-transitory computer-readable medium storing computer-executable code for wireless communication by a user equipment (UE), the code when executed by a processor cause the processor to:
receive, from a base station, a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation;
based on a determination that an information configuring selection is not received, select the one of the at least two resource allocations for the respective SRS resource based on a default selection that is preconfigured; and
transmit, to the base station, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.
64 . A non-transitory computer-readable medium storing computer-executable code for wireless communication by a base station, the code when executed by a processor cause the processor to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) configuration indicating at least two resource allocations for each SRS resource of an SRS resource set, each of the at least two resource allocations comprising a time resource allocation and a frequency resource allocation; and
receive, from the UE, an SRS on a respective SRS resource of the SRS resource set based on one of the at least two resource allocations for the respective SRS resource, wherein the one of the two at least two resource allocations for the respective SRS resource is selected based on a default selection that is preconfigured,
wherein the frequency resource allocation of the one of the at least two resource allocations for the respective SRS resource is configured with a first transmission comb value, and the frequency resource allocation of another of the at least two resource allocations for the respective SRS resource is configured with a second transmission comb value.