# US 2021/0242995 A1 · Method and apparatus for generating reference signal sequence and for performing data scrambling in wireless communication system

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- Number: US 2021/0242995 A1
- Document ID: US20210242995A1
- Status: Published application
- Kind: A1
- Application number: 16/755,819
- Filed: 2018-10-19
- Published: 2021-08-05
- Earliest claimed: 2017-10-20
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Hoon-Dong NOH; Young-Woo KWAK; Youn-Sun KIM; Cheol-Kyu SHIN
- Web page: https://patentgrep.com/patent/US20210242995A1

## CPC

- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/1273: of downlink data flows
- H04W 72/541: using the level of interference
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure pertains to a method and an apparatus for generating a reference signal (RS) sequence and a data scrambling sequence. A method for a base station transmitting a reference signal according to an embodiment of the present disclosure may comprise the steps of: generating a reference signal sequence; and transmitting a reference signal corresponding to the generated reference signal sequence. The reference signal sequence can be generated using an initial sequence that is determined using a slot number in a transmission frame, a symbol number in a slot, and a scrambling identifier (ID).

## Claims

### Claim 1

A method of transmitting a reference signal by a base station in a wireless communication system, the method comprising:
generating a reference signal sequence; and
transmitting a reference signal corresponding to the generated reference signal sequence,
wherein the reference signal sequence is generated using an initial sequence determined using a slot number in a transmission frame and a symbol number in a slot and a reference signal identifier (ID), and
wherein the reference signal identifier is a scrambling identifier (ID).

### Claim 2 (depends on 1)

The method of claim 1, wherein the initial sequence is determined using Equation 1, and wherein
c
init
=
(
2
1
⁢
0
×
(
(
1
⁢
4
⁢
n
s
,
f
μ
+
l
+
1
)
⁢
(
2
⁢
N
ID
CSI
+
1
)
+
N
ID
CSI
)
)
⁢
mod
⁢
⁢
2
3
⁢
1
Equation
⁢
⁢
1
in Equation 1 above, the cinit is the initial sequence, the ns,fμ is the slot number in the transmission frame, the l is the symbol number in the slot, the NIDCSI is the reference signal identifier, and the mod is a modulo operation.

### Claim 3 (depends on 1)

The method of claim 1, wherein the initial sequence is determined further using the number of slots in the transmission frame determined by a subcarrier spacing (SCS).

### Claim 4 (depends on 3)

The method of claim 3, wherein the initial sequence is determined using Equation 2, and wherein
c
init
=
(
2
1
⁢
0
×
(
(
(
14
⁢
(
n
s
,
f
μ
⁢
mod
⁢
{
N
slot
frame
,
μ
/
M
}
)
)
+
l
+
1
)
⁢
(
2
⁢
N
ID
CSI
+
1
)
+
N
ID
CSI
)
)
⁢
mod
⁢
⁢
2
3
⁢
1
Equation
⁢
⁢
2
in Equation 2 above, the cinit is the initial sequence, the ns,fμ is the slot Iv number in the transmission frame, the Nslotframe,μ is the number of slots in the transmission frame determined by the SCS, the M is a variable determining an initialization periodicity of the initial sequence, the I is the symbol number in the slot, the NIDCSI is the reference signal identifier, and the mod is a modulo operation.

### Claim 5 (depends on 4)

The method of claim 4, wherein the M has a preset value, a value indicated among candidate values, a value determined by a predetermined parameter, or a value determined according to a usage of the reference signal.

### Claim 6 (depends on 1)

The method of claim 1, further comprising transmitting information indicating a method used to determine the initial sequence,
wherein the method used to determine the initial sequence is determined depending on a transmission type of a physical downlink shared channel (PDSCH) or a usage of the reference signal.

### Claim 7

A base station configured to transmit a reference signal in a wireless communication system, comprising:
a transceiver; and
a processor configured to control the transceiver,
wherein the processor is configured to:
generate a reference signal sequence; and
transmit a reference signal corresponding to the generated reference signal sequence,
wherein the reference signal sequence is generated using an initial sequence determined using a slot number in a transmission frame and a symbol number in a slot and a reference signal identifier (ID), and
wherein the reference signal identifier is a scrambling identifier (ID).

### Claim 8 (depends on 7)

The base station of claim 7, wherein the initial sequence is determined using Equation 1, and wherein
cinit(210×((14ns,fμ+l+1)(2NIDCSI+1)+NIDCSI))mod 231 [Equation 1]
in Equation 1 above, the cinit is the initial sequence, the ns,fμ is the slot number in the transmission frame, the l is the symbol number in the slot, the NIDCSI is the reference signal identifier, and the mod is a modulo operation.

### Claim 9

A method of receiving a reference signal by a user equipment (UE) in a wireless communication system, the method comprising:
receiving a reference signal corresponding to a reference signal sequence,
wherein the reference signal sequence is generated using an initial sequence determined using a slot number in a transmission frame and a symbol number in a slot and a reference signal identifier (ID), and
wherein the reference signal identifier is a scrambling identifier (ID).

### Claim 10 (depends on 9)

The method of claim 9, wherein the initial sequence is determined using Equation 1, and wherein
cinit=(210×((14ns,fμ+l+1)(2NIDCSI+1)+NIDCSI))mod231 Equation 1
in Equation 1 above, the cinit is the initial sequence, the ns,fμ is the slot number in the transmission frame, the l is the symbol number in the slot, the NIDCSI is the reference signal identifier, and the mod is a modulo operation.

### Claim 11 (depends on 9)

The method of claim 9, wherein the initial sequence is determined further using the number of slots in the transmission frame determined by a subcarrier spacing (SCS).

### Claim 12 (depends on 11)

The method of claim 11, wherein the initial sequence is determined using Equation 2, and wherein
cinit=(210×((14(ns,fμ mod{Nslotframe,μ/M}))+l+1)(2NIDCSI+1)+NIDCSI))mod 231 Equation 2
in Equation 2 above, the cinit is the initial sequence, the ns,fμ is the slot number in the transmission frame, the Nslotframe,μ is the number of slots in the transmission frame determined by the SCS, the M is a variable determining an initialization periodicity of the initial sequence, the l is the symbol number in the slot, the NIDCSI is the reference signal identifier, and the mod is a modulo operation.

### Claim 13 (depends on 12)

The method of claim 12, wherein the M has a preset value, a value indicated among candidate values, a value determined by a predetermined parameter, or a value determined according to a usage of the reference signal.

### Claim 14

A UE configured to receive a reference signal in a wireless communication system, comprising:
a transceiver; and
a processor configured to control the transceiver, wherein
the processor is configured to:
wherein receive a reference signal corresponding to a reference signal sequence,
wherein the reference signal sequence is generated using an initial sequence determined using a slot number in a transmission frame and a symbol number in a slot and a scrambling identifier (ID).

### Claim 15 (depends on 14)

The UE of claim 14,
wherein the initial sequence is determined using Equation 1, and
wherein
cinit=(210×((14ns,fμ+l+1)(2NIDCSI+1)+NIDCSI))mod 231 [Equation 1]
in Equation 1 above, the cinit is the initial sequence, the ns,fμ is the slot number in the transmission frame, the l is the symbol number in the slot, the NIDCSI is the reference signal identifier, and the mod is a modulo operation.

### Claim 16 (depends on 7)

The base station of claim 7, wherein the initial sequence is determined further using the number of slots in the transmission frame determined by a subcarrier spacing (SCS).

### Claim 17 (depends on 16)

The base station of claim 16, wherein the initial sequence is determined using Equation 2, and wherein
cinit=(210×(((14(ns,fμ mod{NSlotframe,μ/M}))+l+1)(2NIDCSI+1)+NIDCSI))mod 231 [Equation 2]
in Equation 2 above, the cinit is the initial sequence, the ns,fμ is the slot number in the transmission frame, the Nslotframe,μ is the number of slots in the transmission frame determined by the SCS, the M is a variable determining an initialization periodicity of the initial sequence, the l is the symbol number in the slot, the NIDslot is the reference signal identifier, and the mod is a modulo operation.

### Claim 18 (depends on 17)

The base station of claim 17, wherein the M has a preset value, a value indicated among candidate values, a value determined by a predetermined parameter, or a value determined according to a usage of the reference signal.

### Claim 19 (depends on 7)

The method of claim 7, further comprising transmitting information indicating a method used to determine the initial sequence,
wherein the method used to determine the initial sequence is determined depending on a transmission type of a physical downlink shared channel (PDSCH) or a usage of the reference signal.

### Claim 20 (depends on 14)

The UE of claim 14, wherein the initial sequence is determined further using the number of slots in the transmission frame determined by a subcarrier spacing (SCS).