IP Library › Granted Patent US 12665723
Granted Patent B2
US 12665723 · App. 18/573,886 · Granted Jun 23, 2026

Sounding reference signal multiplexing for non-terrestrial networks

Inventors: Liangping Ma (San Diego, CA); Alberto Rico Alvarino (San Diego, CA); Xiao Feng Wang (San Diego, CA); Peter Gaal (San Diego, CA); Changhwan Park (San Diego, CA); Ayan Sengupta (San Diego, CA); Wanshi Chen (San Diego, CA); Jun Ma (San Diego, CA); Bharat Shrestha (San Diego, CA); Huilin Xu (Temecula, CA); Umesh Phuyal (San Diego, CA); Juan Montojo (San Diego, CA); Yiqing Cao (Beijing, CN)
Assignee: QUALCOMM Incorporated
H04L5/0051H04W72/1268H04W84/06
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Quick Facts
Patent No.
US 12665723
App. No.
18/573,886
Granted
Jun 23, 2026
Kind
B2
Abstract

Certain aspects of the present disclosure provide a method for wireless communications by a UE that generally includes transmitting a first sounding reference signal (SRS), from a first antenna port in a first symbol, on one or more tones determined by a first comb size and a first tone offset, transmitting a second SRS, from a second antenna port in the first symbol, on one or more tones determined by the first comb size and a second tone offset different than the first tone offset, transmitting a third SRS, from the first antenna port in a second symbol, on one or more tones determined by the first comb size and the second tone offset, and transmitting a fourth SRS, from the second antenna port in the second symbol, on one or more tones determined by the first comb size and the first tone offset.

Claims (52)

1 . A method for wireless communication by a user equipment (UE), the method comprising:

transmitting a first sounding reference signal (SRS), from a first antenna port in a first symbol, on one or more tones determined by a first comb size and a first tone offset;

transmitting a second SRS, from a second antenna port in the first symbol, on one or more tones determined by the first comb size and a second tone offset different than the first tone offset;

transmitting a third SRS, from the first antenna port in a second symbol, on one or more tones determined by the first comb size and the second tone offset; and

transmitting a fourth SRS, from the second antenna port in the second symbol, on one or more tones determined by the first comb size and the first tone offset.

2 . The method of claim 1 , wherein a frequency shift associated with a difference between the first tone offset and the second tone offset is determined based on the first comb size and a number of antenna ports.

3 . The method of claim 1 , wherein:

the first SRS is transmitted from the first antenna port using a first power amplifier (PA); and

the second SRS is transmitted from the second antenna port using a second PA.

4 . The method of claim 1 , wherein the first SRS and the second SRS are transmitted to a non-terrestrial network (NTN).

5 . The method of claim 1 , wherein the first SRS is transmitted from the first antenna port with a different cyclic shift than the second SRS transmitted from the second antenna port.

6 . The method of claim 1 , wherein at least one of: the first SRS, the second SRS, the third SRS or the fourth SRS is frequency division multiplexed (FDM) with SRS transmitted by one or more other UEs.

7 . The method of claim 1 , further comprising:

using a first spreading code when transmitting the first and third SRS from the first antenna port in the first symbol and the second symbols; and

using a second spreading code when transmitting the second and fourth SRS from the second antenna port in the first symbol and the second symbols.

8 . The method of claim 7 , wherein the first spreading code and the second spreading code result in code division multiplexing across time, frequency, or both time and frequency.

9 . The method of claim 1 , wherein the first comb size comprises an odd number.

10 . The method of claim 9 , further comprising

receiving signaling indicating the first comb size.

11 . The method of claim 10 , wherein the signaling indicates the UE is to use the first comb size when the first SRS and the second SRS are transmitted with a physical uplink shared channel (PUSCH) having a bandwidth less than a threshold value.

12 . The method of claim 1 , further comprising:

receiving signaling indicating when the UE is allowed to perform at least one of time pre-compensation or frequency pre-compensation; and

performing pre-compensation for SRS transmissions in accordance with the indication.

13 . The method of claim 12 , wherein the signaling indicates the UE is allowed to perform at least one of time pre-compensation or frequency pre-compensation at slot boundaries or subframe boundaries.

14 . The method of claim 13 , wherein a duration between slot boundaries or subframe boundaries on which the UE is allowed to perform at least one of time pre-compensation or frequency pre-compensation is based on at least one of: satellite properties, parameters provided to derive a timing advance (TA), a cyclic prefix (CP) duration, or a subcarrier spacing.

15 . A method for wireless communications, the method comprising:

receiving, from a user equipment (UE), a first sounding reference signal (SRS), transmitted from a first antenna port in a first symbol, on one or more tones determined by a first comb size and a first tone offset;

receiving, from the UE, a second SRS, transmitted from a second antenna port in the first symbol, on one or more tones determined by the first comb size and a second tone offset different than the first tone offset;

receiving a third SRS, transmitted from the first antenna port in a second symbol, on one or more tones determined by the first comb size and the second tone offset; and

receiving a fourth SRS, transmitted from the second antenna port in the second symbol, on one or more tones determined by the first comb size and the first tone offset.

16 . The method of claim 15 , wherein a frequency shift associated with a difference between the first tone offset and the second tone offset is determined based on the first comb size and s number of antenna ports.

17 . The method of claim 15 , wherein the first SRS is transmitted with a different cyclic shift than the second SRS.

18 . The method of claim 15 , wherein at least one of: the first SRS, the second SRS, the third SRS or the fourth SRS is frequency division multiplexed (FDM) with SRS transmitted by one or more other UEs.

19 . The method of claim 15 , further comprising:

using a first spreading code to process the first SRS and the third SRS; and

using a second spreading code to process the second SRS and the fourth SRS.

20 . The method of claim 15 , wherein the first comb size comprises an odd number.

21 . The method of claim 20 , further comprising transmitting signaling, to the UE, indicating the first comb size.

22 . The method of claim 21 , wherein the signaling indicates the UE is to use the first comb size when the first SRS and the second SRS are transmitted with a physical uplink shared channel (PUSCH) having a bandwidth less than a threshold value.

23 . The method of claim 15 , further comprising transmitting signaling indicating when the UE is allowed to perform at least one of time pre-compensation or frequency pre-compensation for SRS transmissions.

24 . The method of claim 23 , wherein the signaling indicates the UE is allowed to perform at least one of time pre-compensation or frequency pre-compensation at slot boundaries or subframe boundaries.

25 . The method of claim 24 , further comprising determining a duration between slot boundaries or subframe boundaries on which the UE is allowed to perform at least one of time pre-compensation or frequency pre-compensation, based on at least one of: satellite properties, parameters provided to derive a timing advance (TA), a cyclic prefix (CP) duration, or a subcarrier spacing.

26 . A user equipment (UE) comprising at least one processor, coupled to at least one memory, and configured to cause the UE to:

transmit a first sounding reference signal (SRS), from a first antenna port in a first symbol, on one or more tones determined by a first comb size and a first tone offset;

transmit a second SRS, from a second antenna port in the first symbol, on one or more tones determined by the first comb size and a second tone offset different than the first tone offset;

transmit a third SRS, from the first antenna port in a second symbol, on one or more tones determined by the first comb size and the second tone offset; and

transmit a fourth SRS, from the second antenna port in the second symbol, on one or more tones determined by the first comb size and the first tone offset.

27 . An apparatus for wireless communications, the apparatus comprising at least one processor, coupled to at least one memory, and configured to cause the apparatus to:

receive, from a user equipment (UE), a first sounding reference signal (SRS), transmitted from a first antenna port in a first symbol, on one or more tones determined by a first comb size and a first tone offset;

receive, from the UE, a second SRS, transmitted from a second antenna port in the first symbol, on one or more tones determined by the first comb size and a second tone offset different than the first tone offset;

receive a third SRS, transmitted from the first antenna port in a second symbol, on one or more tones determined by the first comb size and the second tone offset; and

receive a fourth SRS, transmitted from the second antenna port in the second symbol, on one or more tones determined by the first comb size and the first tone offset.