US 12,634,185 B2Granted

Sounding reference signal (SRS) enhancement for multi-transmission and reception point (TRP) operation

AssigneeApple Inc.

InventorsHaitong Sun, Seyed Ali Akbar Fakoorian, Chunxuan Ye, Dawei Zhang, Oghenekome Oteri, Jie Cui, Wei Zeng, Hong He, Ankit Bhamri

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Abstract

Some aspects of this disclosure relate to apparatuses and methods for implementing mechanisms for reducing interferences for Sounding Reference Signal (SRS) by, for example, one or more of frequency domain interference randomization, code domain interference randomization, or power control. For example, a user equipment (UE) can be configured to determine a comb offset and/or a cyclic shift for each Sounding Reference Signal (SRS) transmission occasion for the UE. The comb offset and/or the cyclic shift change between different SRS transmission occasions of the UE. The UE is further configured to transmit an SRS to the base station using the determined comb offset and/or the determined cyclic shift during the SRS transmission occasion corresponding.

Claims19

Dependent claims

A user equipment (UE), comprising:

a transceiver configured to enable wireless communication with a base station;
and
a processor communicatively coupled to the transceiver and configured to:
determine a cyclic shift for each of a plurality of Sounding Reference Signal (SRS) transmission occasions for the UE, wherein the cyclic shift changes between each SRS transmission occasion of the plurality of SRS transmission occasions, and
wherein:
the cyclic shift for the each SRS transmission occasion is determined as
CyclicShift
⁢
(
k
)
=
mod
⁡
(
CyclicShift
+
F
⁡
(
mod
⁡
(
k
,
n
SRS
CS
,
ma
⁢
x
)
)
,
n
SRS
CS
,
ma
⁢
x
)
,
k is a non-negative integer indicating the SRS transmission occasion,
n
SRS
CS
,
ma
⁢
x
is a maximum number of cyclic shifts derived from a Radio Resource Control (RRC) configured comb size configuration,
mod is a modulo operation,
CyclicShift is a RRC configured cyclic shift,
F is an offset applied to the RRC configured cyclic shift, and
CyclicShift (k) is the cyclic shift for the SRS transmission occasion k;
generate a first SRS for a first SRS transmission occasion of the plurality of SRS transmission occasions using the determined cyclic shift corresponding to the first SRS transmission occasion;
and
transmit, using the transceiver, the first SRS to the base station.

57 more elements

A method, comprising:

determining, by a user equipment (UE), a cyclic shift for each of a plurality of Sounding Reference Signal (SRS) transmission occasions for the UE, wherein the cyclic shift changes between each SRS transmission occasion of the plurality of SRS transmission occasions, and
wherein:
the cyclic shift for the each SRS transmission occasion is determined as
CyclicShift
⁡
(
k
)
=
mod
⁡
(
CyclicShift
+
F
⁡
(
mod
⁡
(
k
,
n
SRS
CS
,
ma
⁢
x
)
)
,
n
SRS
CS
,
ma
⁢
x
)
,
k is a non-negative integer indicating the SRS transmission occasion,
n
SRS
CS
,
ma
⁢
x
is a maximum number of cyclic shifts derived from a Radio Resource Control (RRC) configured comb size configuration,
mod is a modulo operation,
CyclicShift is a RRC configured cyclic shift,
F is an offset applied to the RRC configured cyclic shift, and
CyclicShift (k) is the cyclic shift for the SRS transmission occasion k;
generating, by the UE, a first SRS for a first SRS transmission occasion of the plurality of SRS transmission occasions using the determined cyclic shift corresponding to the first SRS transmission occasion;
and
transmitting, by the UE, the first SRS to a base station.

54 more elements

A non-transitory computer-readable medium storing instructions that when executed by a processor of a user equipment (UE), the instructions cause the processor to perform operations comprising:

determining a cyclic shift for each of a plurality of Sounding Reference Signal (SRS) transmission occasions for the UE, wherein the cyclic shift changes between each SRS transmission occasion of the plurality of SRS transmission occasions, and
wherein:
the cyclic shift for the each SRS transmission occasion is determined as
CyclicShift
⁡
(
k
)
=
mod
⁡
(
CyclicShift
+
F
⁡
(
mod
⁡
(
k
,
n
SRS
CS
,
ma
⁢
x
)
)
,
n
SRS
CS
,
ma
⁢
x
)
,
k is a non-negative integer indicating the SRS transmission occasion,
n
SRS
CS
,
ma
⁢
x
is a maximum number of cyclic shifts derived from a Radio Resource Control (RRC) configured comb size configuration,
mod is a modulo operation,
CyclicShift is a RRC configured cyclic shift,
F is an offset applied to the RRC configured cyclic shift, and
CyclicShift (k) is the cyclic shift for the SRS transmission occasion k;
generating a first SRS for a first SRS transmission occasion of the plurality of SRS transmission occasions using the determined cyclic shift corresponding to the first SRS transmission occasion;
and
transmitting the first SRS to a base station.

54 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/199,457Filed 19 May 2023 · us provisional application
Priority: 5 Aug 2022
Published: US 2024/0048419 A18 Feb 2024
Granted: 19 May 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 27/26134
Structure of the reference signals: pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
H04J 11/003
Of multi-user interference: at the transmitter
H04L 5/0035
Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation: resource allocation in a cooperative…
H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver