Sounding reference signal (SRS) configurations for one or more frequency hops
In an aspect, a UE receives an SRS configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth to SRS per OFDM symbol in a respective frequency hop. The UE transmits, to a BS in a first frequency hop, OFDM symbols with SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop. In another aspect, the UE receives an SRS configuration that indicates, for frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of OFDM symbols used in the respective frequency hop. The UE transmits OFDM symbols with SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network entity, a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
transmitting, in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
transmitting, in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
2. The method of claim 1 , wherein the first plurality of OFDM symbols correspond to a consecutive collection of OFDM symbols of a slot.
3. The method of claim 1 ,
wherein the first plurality of OFDM symbols correspond to a first consecutive collection of OFDM symbols of a slot, and
wherein the second plurality of OFDM symbols correspond to a second consecutive collection of OFDM symbols of the slot.
4. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network entity, a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop; and
transmitting, in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop,
wherein the SRS configuration indicates, for a first set of frequency hops in a slot, a comb-N SRS resource which spans M symbols with a repetition factor of R and B frequency hops within the slot, satisfies the equation of N*R*B=M, wherein M is greater than 1.
5. The method of claim 4 ,
wherein for a comb-2 with 4 symbols, R is one of 1 or 2 and B is one of 1 or 2, or
wherein for a comb-2 with 8 symbols, R is one of 1, 2 or 4 and B is one of 1, 2 or 4,
wherein for a comb-2 with 12 symbols, R is one of 1, 2, 4 or 6 and B is one of 1, 2, 4 or 6,
wherein for a comb-4 with 8 symbols, R is one of 1 or 2 and B is one of 1 or 2, or
wherein for a comb-4 and 12 symbols, R is one of 1 or 3 and B is one of 1 or 3.
6. The method of claim 4 ,
wherein M is greater than R, or
wherein M is greater than B, or
a combination thereof.
7. The method of claim 4 , wherein the SRS configuration further, for a second set of frequency hops in a slot, one or more modified values for one or more of N, R, B and/or M.
8. The method of claim 7 , wherein the SRS configuration sets comb-N to a new value of comb-N2, for a last frequency hop in the slot, where value of N2 is less than N.
9. The method of claim 8 , wherein M is equal to 12, R is equal to 1, B is equal to 2, N is equal to 8 for the first set of frequency hops in the slot and N2 is equal to 4 for the last frequency hop in the slot.
10. The method of claim 4 , wherein the SRS configuration further configures two comb-types and two resource element offsets to be used in the first frequency hop and a second frequency hop, respectively.
11. The method of claim 1 , wherein the network entity is one of a serving TRP, a location server, or a location management function.
12. A method of wireless communication performed by a base station (BS), comprising:
transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
receiving, from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
receiving, from the UE in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
13. The method of claim 12 , wherein the first plurality of OFDM symbols correspond to a consecutive collection of OFDM symbols of a slot.
14. The method of claim 12 ,
wherein the first plurality of OFDM symbols correspond to a first consecutive collection of OFDM symbols of a slot, and
wherein the second plurality of OFDM symbols correspond to a second consecutive collection of OFDM symbols of the slot.
15. A method of wireless communication performed by a base station (BS), comprising:
transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop; and
receiving, from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop,
wherein the SRS configuration indicates, for a first set of frequency hops in a slot, a comb-N SRS resource which spans M symbols with a repetition factor of R and B frequency hops within the slot, satisfies the equation of N*R*B=M, wherein M is greater than 1.
16. The method of claim 15 ,
wherein for a comb-2 with 4 symbols, R is one of 1 or 2 and B is one of 1 or 2, or
wherein for a comb-2 with 8 symbols, R is one of 1, 2 or 4 and B is one of 1, 2 or 4,
wherein for a comb-2 with 12 symbols, R is one of 1, 2, 4 or 6 and B is one of 1, 2, 4 or 6,
wherein for a comb-4 with 8 symbols, R is one of 1 or 2 and B is one of 1 or 2, or
wherein for a comb-4 and 12 symbols, R is one of 1 or 3 and B is one of 1 or 3.
17. The method of claim 15 ,
wherein M is greater than R, or
wherein M is greater than B, or
a combination thereof.
18. The method of claim 15 , wherein the SRS configuration further, for a second set of frequency hops in a slot, one or more modified values for one or more of N, R, B and/or M.
19. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network entity, a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
transmitting, in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
20. The method of claim 19 , wherein the SRS configuration is for a comb-N SRS resource that spans M symbols with a repetition factor of R and B hops within a slot, satisfies the equation of N*R*B>M, wherein M is greater than 1 and B is greater than 1.
21. The method of claim 20 , wherein M is equal to 12, R is equal to 1, B is equal to 2, Nis equal to 8 and where 8 OFDM symbols are used in a first frequency hop and 4 OFDM symbols are used in a second frequency hop.
22. The method of claim 19 ,
wherein, in a first frequency hop, a first sequence of resource elements offsets is used whereby a resource element position is incremented by a first number of resource elements per OFDM symbol, and
wherein, in a second frequency hop, a second sequence of resource elements offsets is used whereby a resource element position is incremented by a second number of resource elements per OFDM symbol.
23. The method of claim 22 ,
wherein the first number of resource elements is one and the second number of resource elements is two, or
wherein the first number of resource elements is two and the second number of resource elements is one.
24. A method of wireless communication performed by a base station (BS), comprising:
transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
receiving, from the UE in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
25. The method of claim 24 , wherein the SRS configuration is for a comb-N SRS resource that spans M symbols with a repetition factor of R and B hops within a slot, satisfies the equation of N*R*B>M, wherein M is greater than 1 and B is greater than 1.
26. The method of claim 25 , wherein M is equal to 12, R is equal to 1, B is equal to 2, Nis equal to 8 and where 8 OFDM symbols are used in a first frequency hop and 4 OFDM symbols are used in a second frequency hop.
27. The method of claim 24 ,
wherein, in a first frequency hop, a first sequence of resource elements offsets is used whereby a resource element position is incremented by a first number of resource elements per OFDM symbol, and
wherein, in a second frequency hop, a second sequence of resource elements offsets is used whereby a resource element position is incremented by a second number of resource elements per OFDM symbol.
28. The method of claim 27 ,
wherein the first number of resource elements is one and the second number of resource elements is two, or
wherein the first number of resource elements is two and the second number of resource elements is one.
29. A user equipment (UE), comprising:
means for receiving, from a network entity, a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
means for transmitting, in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
means for transmitting, in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
30. A base station (BS), comprising:
means for transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
means for receiving, from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
means for receiving, from the UE in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding BW associated with the second frequency hop.
31. A user equipment (UE), comprising:
means for receiving, from a network entity, a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
means for transmitting, in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
32. A base station (BS), comprising:
means for transmitting, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
means for receiving, from the UE in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
33. A user equipment (UE), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
receive, from a network entity, a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
transmit, in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
transmit, in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
34. A base station (BS), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
receive, from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
receive, from the UE in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
35. A user equipment (UE), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
receive, from a network entity, a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
transmit, in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
36. A base station (BS), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
receive, from the UE in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
37. A non-transitory computer-readable medium containing instructions stored thereon, for causing at least one processor in a user equipment (UE) to:
receive, from a network entity, a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop;
transmit, in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
transmit, in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
38. A non-transitory computer-readable medium containing instructions stored thereon, for causing at least one processor in a base station to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth for SRS per orthogonal frequency division multiplexing (OFDM) symbol in a respective frequency hop; and
receive, from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and
receive, from the UE in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
39. A non-transitory computer-readable medium containing instructions stored thereon, for causing at least one processor in a user equipment (UE) to:
receive, from a network entity, a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
transmit, in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.
40. A non-transitory computer-readable medium containing instructions stored thereon, for causing at least one processor in a base station to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) configuration that indicates, for each of a plurality of frequency hops associated with the same comb-type, a sequence of resource element offsets that is based on a number of orthogonal frequency division multiplexing (OFDM) symbols used in the respective frequency hop; and
receive, from the UE in each of the plurality of frequency hops, a plurality of consecutive OFDM symbols with at least one SRS in accordance with the sequence of resource element offsets indicated by the SRS configuration for the respective frequency hop.