US 12,739,159 B2Granted

OFDM communications system with method for determination of subcarrier offset for OFDM symbol generation

AssigneeHuawei Technologies Co., Ltd.

InventorsJavad Abdoli, Zhenfei Tang

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Abstract

The middle subcarrier of the baseband OFDM signal of each numerology may need to be shifted appropriately with respect to other numerologies to comply with a nested grid. These shifts can be signalled to the UE with an associated overhead. Methods and systems are provided to reduce overhead for OFDM communication. Reduced overhead can translate into increased bandwidth for the system, and/or reduced power/battery consumption in the UE. A transmitter generates an OFDM signal associated with a first subcarrier spacing of a first numerology (μ), a middle subcarrier frequency of a set of usable resource blocks (RBs) of the first numerology being offset from a carrier frequency by a first offset having a value ( k 0 , x μ ) in units of subcarriers, the value of the first offset being defined by a specific formula. The transmitter transmits the OFDM signal according to the first subcarrier spacing and the first offset.

Claims20

Dependent claims

A method comprising:

transmitting or receiving, by an apparatus, orthogonal frequency division multiplexing (OFDM) signal parameters including a first subcarrier spacing of a first numerology μ, a first value of a first offset
N
grid
,
x
start
,
μ
in units of resource blocks (RBs), a first quantity
N
grid
,
x
size
,
μ
of usable RBs of the first numerology μ, a second value of a second offset
N
grid
,
x
start
,
μ
0
in units of RBs, and a second quantity
N
grid
,
x
size
,
μ
0
of usable RBs of a offset reference numerology μ0, wherein:
x identifies a transmission direction being either downlink (DL) or uplink (UL),
the first offset is between a reference point and a start of the usable RBs of the first numerology μ, and
the second offset is between the reference point and a start of the usable RBs of the reference numerology μ0;
and
transmitting or receiving, by the apparatus, an OFDM signal
s
l
(
p
,
μ
)
(
t
)
that satisfies:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
N
grid
size
,
μ
⁢
N
sc
RB
-
1
a
k
,
l
(
p
,
μ
)
·
e
j
⁢
2
⁢
π
⁡
(
k
+
(
(
N
grid
,
x
start
,
μ
+
N
grid
,
x
size
,
μ
/
2
)
⁢
N
sc
RB
-
(
N
grid
,
x
start
,
μ
0
+
N
grid
,
x
size
,
μ
0
/
2
)
⁢
N
sc
RB
⁢
2
μ
0
-
μ
)
-
N
grid
size
,
μ
⁢
N
sc
RB
2
)
⁢
Δ
⁢
f
⁡
(
t
-
N
CP
,
l
μ
⁢
T
c
-
t
start
,
l
μ
)
wherein
N
sc
RB
is a quantity of subcarriers in an RB, p indicates an antenna port, and l indicates an OFDM symbol in a subframe.

191 more elements

An apparatus comprising:

a non-transitory memory storage comprising instructions;
and
one or more processors in communication with the non-transitory memory storage, wherein the one or more processors execute the instructions to cause the apparatus to perform operations including:
transmitting or receiving orthogonal frequency division multiplexing (OFDM) signal parameters including a first subcarrier spacing of a first numerology μ, a first value of a first offset
N
grid
,
x
start
,
μ
in units of resource blocks (RBs), a first quantity
N
grid
,
x
size
,
μ
of usable RBs of the first numerology μ, a second value of a second offset
N
grid
,
x
start
,
μ
0
in units of RBs, and a second quantity
N
g
⁢
r
⁢
id
,
x
s
⁢
ize
,
μ
0
of usable RBs of a reference numerology μ0, wherein:
x identifies a transmission direction being either downlink (DL) or uplink (UL),
the first offset is between a reference point and a start of the usable RBs of the first numerology μ, and
the second offset is between the reference point and a start of the usable RBs of the reference numerology μ0;
and
transmitting or receiving an OFDM signal
s
l
(
p
,
μ
)
(
t
)
(t) that satisfies:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
N
grid
size
,
μ
⁢
N
sc
RB
-
1
a
k
,
l
(
p
,
μ
)
·
e
j
⁢
2
⁢
π
⁡
(
k
+
(
(
N
grid
,
x
start
,
μ
+
N
grid
,
x
size
,
μ
/
2
)
⁢
N
sc
RB
-
(
N
grid
,
x
start
,
μ
0
+
N
grid
,
x
size
,
μ
0
/
2
)
⁢
N
sc
RB
⁢
2
μ
0
-
μ
)
-
N
grid
size
,
μ
⁢
N
sc
RB
2
)
⁢
Δ
⁢
f
⁡
(
t
-
N
CP
,
l
μ
⁢
T
c
-
t
start
,
l
μ
)
wherein
N
s
⁢
c
R
⁢
B
is a quantity of subcarriers in an RB, p indicates an antenna port, and l indicates an OFDM symbol in a subframe.

204 more elements

A method comprising:

transmitting or receiving, by an apparatus, orthogonal frequency division multiplexing (OFDM) signal parameters including a first subcarrier spacing of a first numerology μ, a first value of a first offset
N
grid
,
x
s
⁢
t
⁢
a
⁢
r
⁢
t
,
μ
in units of resource blocks (RBs), a first quantity
N
g
⁢
r
⁢
id
,
x
s
⁢
ize
,
μ
of usable RBs of the first numerology μ, a second value of a second offset
N
g
⁢
r
⁢
id
,
x
s
⁢
t
⁢
art
,
μ
0
in units of RBs, and a second quantity
N
g
⁢
rid
,
x
s
⁢
i
⁢
z
⁢
e
,
μ
0
of usable RBs of a reference numerology μ0, wherein:
x identifies a transmission direction being either downlink (DL) or uplink (UL),
the first offset is between a reference point and a start of the usable RBs of the first numerology μ, and
the second offset is between the reference point and a start of the usable RBs of the reference numerology μ0;
and
transmitting or receiving, by the apparatus, an OFDM signal
s
l
(
p
,
μ
)
(
t
)
(t) that satisfies:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
L
RA
-
1
a
k
(
p
,
RA
)
·
e
j
⁢
2
⁢
π
⁡
(
k
+
Kk
1
+
k
_
)
⁢
Δ
⁢
f
RA
(
t
-
N
CP
,
l
RA
⁢
T
c
-
t
start
RA
)
K
=
Δ
⁢
f
Δ
⁢
f
RA
k
1
=
(
N
grid
,
x
start
,
μ
+
N
grid
,
x
size
,
μ
/
2
)
⁢
N
sc
RB
-
(
N
grid
,
x
start
,
μ
0
+
N
grid
,
x
size
,
μ
0
/
2
)
⁢
N
sc
RB
⁢
2
μ
0
-
μ
+
N
BWP
,
i
start
⁢
N
sc
RB
+
n
RA
start
⁢
N
sc
RB
+
n
RA
⁢
N
RB
RA
⁢
N
sc
RB
-
N
grid
size
,
μ
⁢
N
sc
RB
2
wherein
N
s
⁢
c
R
⁢
B
is a quantity of subcarriers in an RB, p indicates an antenna port, and l indicates an OFDM symbol in a subframe.

258 more elements

An apparatus comprising:

a non-transitory memory storage comprising instructions;
and
one or more processors in communication with the non-transitory memory storage, wherein the one or more processors execute the instructions to cause the apparatus to perform operations including:
transmitting or receiving orthogonal frequency division multiplexing (OFDM) signal parameters including a first subcarrier spacing of a first numerology μ, a first value of a first offset
N
g
⁢
rid
,
x
s
⁢
t
⁢
a
⁢
r
⁢
t
,
μ
in units of resource blocks (RBs), a first quantity
N
g
⁢
r
⁢
id
,
x
s
⁢
ize
,
μ
0
of usable RBs of the first numerology μ, a second value of a second offset
N
g
⁢
r
⁢
id
,
x
s
⁢
t
⁢
a
⁢
r
⁢
t
,
μ
0
in units of RBs, and a second quantity
N
g
⁢
r
⁢
id
,
x
s
⁢
ize
,
μ
0
of usable RBs of a reference numerology μ0, wherein:
x identifies a transmission direction being either downlink (DL) or uplink (UL),
the first offset is between a reference point and a start of the usable RBs of the first numerology μ, and
the second offset is between the reference point and a start of the usable RBs of the reference numerology μ0;
and
transmitting or receiving an OFDM signal
s
l
(
p
,
μ
)
(
t
)
that satisfies:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
L
RA
-
1
a
k
(
p
,
RA
)
·
e
j
⁢
2
⁢
π
⁡
(
k
+
Kk
1
+
k
_
)
⁢
Δ
⁢
f
RA
(
t
-
N
CP
,
l
RA
⁢
T
c
-
t
start
RA
)
K
=
Δ
⁢
f
Δ
⁢
f
RA
k
1
=
(
N
grid
,
x
start
,
μ
+
N
grid
,
x
size
,
μ
/
2
)
⁢
N
sc
RB
-
(
N
grid
,
x
start
,
μ
0
+
N
grid
,
x
size
,
μ
0
/
2
)
⁢
N
sc
RB
⁢
2
μ
0
-
μ
+
N
BWP
,
i
start
⁢
N
sc
RB
+
n
RA
start
⁢
N
sc
RB
+
n
RA
⁢
N
RB
RA
⁢
N
sc
RB
-
N
grid
size
,
μ
⁢
N
sc
RB
2
wherein
N
sc
RB
is a quantity of subcarriers in an RB, p indicates an antenna port, and l indicates an OFDM symbol in a subframe.

262 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/585,977Filed 23 Feb 2024 · continuation
Priority: 15 Feb 2018
Published: US 2024/0205062 A120 Jun 2024
Granted: 15 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04L 27/2605
Signal structure: symbol extensions, e.g. Zero Tail, Unique Word [UW]
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
H04L 5/0044
Arrangements for allocating sub-channels of the transmission path: allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
H04L 27/26025
Signal structure: numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking

Family

Application62/631,144Us provisional application · filed 15 Feb 2018
Application16/199,883Parent of this continuation · filed 26 Nov 2018
Application16/553,838Parent of this continuation · filed 28 Aug 2019
US 10,419,257 B2Parent of this continuation · filed 17 Sep 2019
Application17/377,002Parent of this continuation · filed 15 Jul 2021
US 11,070,411 B2Parent of this continuation · filed 20 Jul 2021
US 2024/0205062 A1Pre-grant publication · published 20 Jun 2024
US 11,936,508 B2Parent of this continuation
US 2019/0253292 A1Published application
US 2019/0394074 A1Published application
US 2021/0367818 A1Published application
US 12,739,159 B2This patent

From the US filing history. Foreign family members aren’t listed.