# US 2018/0323942 A1 · Method of generating reference signal in wireless communication system

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- Number: US 2018/0323942 A1
- Document ID: US20180323942A1
- Status: Published application
- Kind: A1
- Application number: 16/031,711
- Filed: 2018-07-10
- Published: 2018-11-08
- Earliest claimed: 2007-09-07
- Assignees: Optis Cellular Technology, LLC
- Applicants: Optis Cellular Technology, LLC
- Inventors: Seung Hee Han; Minseok Noh; Daewon Lee
- Web page: https://patentgrep.com/patent/US20180323942A1

## CPC

- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 27/2613: {Structure of the reference signals}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 88/02: Terminal devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method of generating a reference signal includes acquiring a base sequence and acquiring a reference signal sequence with a length N from the base sequence. Good PAPR/CM characteristics of the reference signal can be kept to enhance performance of data demodulation or uplink scheduling.

## Claims

### Claim 1

A computer-implemented method for transmitting a reference signal in a wireless communication system, the method comprising:
executing, by a processor of a user equipment, instructions stored on non-transitory media which when executed perform the acts of:
generating a plurality of reference signal sequences by cyclically shifting a base sequence xu(n);
mapping each of the plurality of reference signal sequences to a corresponding single carrier frequency division multiple access (SC-FDMA) symbol among a plurality of SC-FDMA symbols in a subframe to form the reference signal, the subframe including the plurality of SC-FDMA symbols in a time domain and two resource blocks in a frequency domain, each resource block including 12 subcarriers; and
transmitting the reference signal,
wherein the base sequence xu(n) is expressed by
xu(n)=ejp(n)π/4, and
at least one of the sets of values provided in the below table is used as a set of values for the phase parameter p(n):
Sequence
index (u)
p(0), . . . , p(23)
0
−1 3 3 3 −3 1 3 −3 −1 −3 −1 1 −3 3 −1 3 1
1 −1 −3 3 −1 −1 −1
1
−1 1 3 −3 3 −1 3−1 1 −1 −3 −1
3 −3 −1 −3 −3 −3 −3 −1 −1 3 1 −1
2
−1 3 1 −1 −3 1 −3 3 1 1 −1 −3 −1 1 −3 −1
1 1 1 3 −3 −1 −1 −1
3
− 1−3 3 3 −3 1 −1 −1 3 3 −3 −3 1 3 3 −1
3 −3 −1 −1 −1 −1 1 −1
4
−1 −1 −3 −1 3 −3 − 3 −1 3 −3 3 1
1 −3 −3 −3 −3 1 −1 −3 1 −1 −1 −1
5
−1 1 −3 −3 −1 −1 1 −1 −3 −3 −3 3 1 −3
1 3 1 −3 3 −3 −1 −3 −3 −1
6
−1 1 1 3 −3 −1 1 −1 −1 −1 3 1 −1 1 −3 1 3 −3
3 1 −3 1 1 −1
7
−1 1 1 −3 −3 −3 −3 −3 −3 −1 3 3 −1 −1 −3
1 −3 1 −3 1 1 −3 3 −1
8
−1 −1 3 3 −1 3 1 −3 −3 1 −3 −1 3 −1 −1 −1 −3
1 1 −1 −3 −3 −3 −1
9
−1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1 1 −3 1 −3
1 1 −3 −1
10
−1 −3 −1 −3 −1 −3 −3 1 1 3 1 3 −1 −1 3 1
1 −3 −3 −1 3 3 −1 −1
11
−1 −3 3 −3 −3 −3 −1 −1 −3 −1 −3 3 1
3 −3 −1 3 −1 1 −1 3 −3 1 −1
12
−1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3
1 −1 −3 −3 −1 −1 −3 −3 −3 −1
13
−1 −3 −1 −1 3 1 3 1 −3 −3 −1 −3 −3 −3 −1
3 3 −1 −1 −3 1 3 −1 −1
14
−1 1 −1 −1 3 −3 3 −3 1 1 −1 1 1 1 −1 3 3 −1 −1
1 −3 3 −1 −1
15
−1 1 −3 −3 −3 1 1 −3 1 1 −1 −1 3 −1 −3
1 −1 −1 1 1 3 1 −3 −1
16
−1 −1 −3 3 −1 −1 −1 3 1 −3 1 1 3 −3
1 −3 −1 −1 −1 3 −3 3 −3 −1
17
−1 1 −3 −1 −3 1 3 −3 3 −3 −3 −3 1 −1
3 −1 −3 −1 −1 −3 −3 1 1 −1
18
−1 3 1 −3 −3 −3 −3 1 −1 1 1 1 −3 −1 1 1
3 −1 −1 3 −1 1 −3 −1
19
−1 1 −3 −1 −1 1 −3 −1 −3 −1 1 1 1 1 3
1 −1 −3 −3 3 −1 3 1 −1
20
−1 1 3 −1 −1 1 −1 −3 −1 −1 1 1 1 −3 3
1 −1 −1 −3 3 −3 −1 3 −1
21
−1 −3 1 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3 1
1 −3 −1 −3 −1
22
−1 −1 3 3 3 −3 −3 3 3 −1 3 −1 −1 −1 −1
3 −3 1 −1 3 −1 −1 3 −1
23
−1 3 −1 3 −1 1 1 3 1 3 −3 1 3 −3 −3 1 1 −3 3 3 3
1 −1 −1
24
−1 −3 −1 −1 1 −3 −1 −1 1 −1 −3 1
1 −3 1 −3 −3 3 1 1 −1 3 −1 −1
25
−1 −1 1 −1 1 1 −1 −1 −3 1 −3 −1 3 1 −3
3 −1 1 3 −3 3 1 −1 −1
26
−1 1 −3 −3 −1 1 −1 1 3 1 3 3 1 1 −1 3 1 −1
3 −1 3 3 −1 −1
27
−1 −1 3 −3 1 −3 1 3 −3 3 1 3 3 −1 −1 3 3 3
1 −3 −1 −1 1 −1
28
−1 3 −1 −1 3 −3 −1 −3 −3 3 −3 3 −1
1 −1 −3 3 3 −3 −1 −1 −1 1 −1
29
−1 1 1 1 3 3 −1 −1 −1 −1 3 −3 −1 3
1 −3 −1 1 −1 −1 −3 1 −1 −1

### Claim 2 (depends on 1)

The method of claim 1, wherein the uplink channel is a physical uplink control channel (PUCCH).

### Claim 3 (depends on 1)

The method of claim 1, wherein the uplink channel is a physical uplink shared channel (PUSCH).

### Claim 4 (depends on 1)

The method of claim 1, wherein the reference signal sequence r(n) is a demodulation reference signal used for demodulating uplink data.

### Claim 5 (depends on 1)

The method of claim 1, wherein the reference signal sequence r(n) is a sounding reference signal used for user scheduling.

### Claim 6

A mobile communications terminal configured to transmit a reference signal in a wireless communication system, comprising:
a processor configured to execute instructions stored on non-transitory media which when executed perform the acts of:
generating a plurality of reference signal sequences by cyclically shifting a base sequence xu(n);
mapping each of the plurality of reference signal sequences to a corresponding single carrier frequency division multiple access (SC-FDMA) symbol among a plurality of SC-FDMA symbols in a subframe to form the reference signal, the subframe including the plurality of SC-FDMA symbols in a time domain and two resource blocks in a frequency domain, each resource block including 12 subcarriers; and
a transmitter configured to transmit the reference signal,
wherein the base sequence xu(n) is expressed by
xu(n)=ejp(n)π/4, and
at least one of the sets of values provided in the below table is used as a set of values for the phase parameter p(n):
Sequence
index (u)
p(0), . . . , p(23)
0
−1 3 3 3 −3 1 3 −3 −1 −3 −1 1 −3 3 −1 3 1
1 −1 −3 3 −1 −1 −1
1
−1 1 3 −3 3 −1 3 −1 1 −1 −3 −1
3 −3 −1 −3 −3 −3 −3 −1 −1 3 1 −1
2
−1 3 1 −1 −3 1 −3 3 1 1 −1 −3 −1 1 −3 −1
1 1 1 3 −3 −1 −1 −1
3
−1 −3 3 3 −3 1 −1 −1 3 3 −3 −3 1 3 3 −1
3 −3 −1 −1 −1 −1 1 −1
4
−1 −1 −3 −1 3 −3 −3 −1 3 −3 3 1
1 −3 −3 −3 −3 1 −1 −3 1 −1 −1 −1
5
−1 1 −3 −3 −1 −1 1 −1 −3 −3 −3 3
1 −3 1 3 1 −3 3 −3 −1 −3 −3 −1
6
−1 1 1 3 −3 −1 1 −1 −1 −1 3 1 −1 1 −3 1
3 −3 3 1 −3 1 1 −1
7
−1 1 1 −3 −3 −3 −3 −3 −3 −1 3
3 −1 −1 −3 1 −3 1 −3 1 1 −3 3 −1
8
−1 −1 3 3 −1 3 1 −3 −3 1 −3 −1
3 −1 −1 −1 −3 1 1 −1 −3 −3 −3 −1
9
−1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1
1 −3 1 −3 1 1 −3 −1
10
−1 −3 −1 −3 −1 −3 −3 1 1 3 1 3 −1 −1
3 1 1 −3 −3 −1 3 3 −1 −1
11
−1 −3 3 −3 −3 −3 −1 −1 −3 −1 −3
3 1 3 −3 −1 3 −1 1 −1 3 −3 1 −1
12
−1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3
1 −1 −3 −3 −1 −1 −3 −3 −3 −1
13
−1 −3 −1 −1 3 1 3 1 −3 −3 −1 −3 −3 −3 −1
3 3 −1 −1 −3 1 3 −1 −1
14
−1 1 −1 −1 3 −3 3 −3 1 1 −1 1 1 1 −1 3
3 −1 −1 1 −3 3 −1 −1
15
−1 1 −3 −3 −3 1 1 −3 1 1 −1 −1
3 −1 −3 1 −1 −1 1 1 3 1 −3 −1
16
−1 −1 −3 3 −1 −1 −1 3 1 −3 1 1 3 −3
1 −3 −1 −1 −1 3 −3 3 −3 −1
17
−1 1 −3 −1 −3 1 3 −3 3 −3 −3 −3
1 −1 3 −1 −3 −1 −1 −3 −3 1 1 −1
18
−1 3 1 −3 −3 −3 −3 1 −1 1 1 1 −3 −1
1 1 3 −1 −1 3 −1 1 −3 −1
19
−1 1 −3 −1 −1 1 −3 −1 −3 −1 1 1 1 1
3 1 −1 −3 −3 3 −1 3 1 −1
20
−1 1 3 −1 −1 1 −1 −3 −1 −1 1 1 1 −3
3 1 −1 −1 −3 3 −3 −1 3 −1
21
−1 −3 1 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3
1 1 −3 −1 −3 −1
22
−1 −1 3 3 3 −3 −3 3 3 −1 3 −1 −1 −1 −1
3 −3 1 −1 3 −1 −1 3 −1
23
−1 3 −1 3 −1 1 1 3 1 3 −3 1 3 −3 −3 1 1 −3 3 3 3
1 −1 −1
24
−1 −3 −1 −1 1 −3 −1 −1 1 −1 −3 1
1 −3 1 −3 −3 3 1 1 −1 3 −1 −1
25
−1 −1 1 −1 1 1 −1 −1 −3 1 −3 −1 3
1 −3 3 −1 1 3 −3 3 1 −1 −1
26
−1 1 −3 −3 −1 1 −1 1 3 1 3 3 1 1 −1 3 1 −1
3 −1 3 3 −1 −1
27
−1 −1 3 −3 1 −3 1 3 −3 3 1 3 3 −1 −1 3 3 3
1 −3 −1 −1 1 −1
28
−1 3 −1 −1 3 −3 −1 −3 −3 3 −3
3 −1 1 −1 −3 3 3 −3 −1 −1 −1 1 −1
29
−1 1 1 1 3 3 −1 −1 −1 −1 3 −3 −1 3
1 −3 −1 1 −1 −1 −3 1 −1 −1

### Claim 7 (depends on 6)

The mobile communication terminal of claim 6, wherein the uplink channel is a physical uplink control channel (PUCCH).

### Claim 8 (depends on 6)

The mobile communication terminal of claim 6, wherein the uplink channel is a physical uplink shared channel (PUSCH).

### Claim 9 (depends on 6)

The mobile communication terminal of claim 6, wherein the reference signal sequence r(n) is a demodulation reference signal used for demodulating uplink data.

### Claim 10 (depends on 6)

The mobile communication terminal of claim 6, wherein the reference signal sequence r(n) is a sounding reference signal used for user scheduling.