REFERENCE SIGNAL TRANSMISSION METHOD AND APPARATUS

• US 20190327053A1
• Filed: 07/02/2019
• Published: 10/24/2019
• Est. Priority Date: 01/06/2017
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: HU, Yuanzhou, DING, Mengying, WANG, Zongjie
• Granted Patent: US 11,095,408 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Disclosed is a reference signal transmission method and a device. The method includes converting, by a sending device, a frequency domain reference signal from frequency domain to time domain, to generate a time domain reference signal. The frequency domain reference signal includes a reference signal sequence mapped to a frequency domain resource. The reference signal sequence is determined based on a Zadoff-Chu (ZC) sequence, and a length value of the ZC sequence is selected from at least two length values. The method includes sending, by the sending device, the time domain reference signal. According to the reference signal transmission method, one ZC sequence is selected from at least two ZC sequences with different lengths to generate the reference signal sequence, so that the generated reference signal sequence is characterized by a low PAPR and an low RCM, and is used to generate a reference signal, to improve data transmission performance.

Claims

1. A reference signal transmission method, comprising:

converting, by a sending device, a frequency domain reference signal from a frequency domain to a time domain, to generate a time domain reference signal, wherein the frequency domain reference signal comprises a reference signal sequence mapped to a frequency domain resource, wherein the reference signal sequence is determined based on a Zadoff-Chu sequence, and wherein a length value of the Zadoff-Chu sequence is selected from at least two length values; and

sending, by the sending device, the time domain reference signal.

2. The method according to claim 1, wherein the Zadoff-Chu sequence is X_q(m), wherein the X_q(m) is determined according to

3. The method according to claim 2, wherein a value of q comprises one or more of:

4. The method according to claim 2, wherein a value of q comprises one or more of:

q=q′

;

or

q=M_k−

q′

, wherein

M_k mod q′

=1 or M_k mod q′

=q′

−

1, and wherein 1≤

q′

≤

└

M_k/2┘

.

5. The method according to claim 2, wherein a length of the reference signal sequence is 48, wherein a value of M_k and a value of q of the Zadoff-Chu sequence are one type in a parameter value set, wherein the value of M_k in the parameter value set has at least two different values, and wherein the parameter value set comprises at least two of:

M_k=47 and q=1;

M_k=47 and q=8;

M_k=47 and q=12;

M_k=47 and q=14;

M_k=47 and q=16;

M_k=47 and q=17;

M_k=47 and q=19;

M_k=47 and q=21;

M_k=47 and q=23;

M_k=47 and q=24;

M_k=47 and q=26;

M_k=47 and q=28;

M_k=47 and q=30;

M_k=47 and q=31;

M_k=47 and q=33;

M_k=47 and q=35;

M_k=47 and q=39;

M_k=47 and q=46;

M_k=87 and q=37;

M_k=87 and q=50;

M_k=117 and q=10;

M_k=117 and q=107;

M_k=125 and q=27;

M_k=125 and q=98;

M_k=129 and q=14;

M_k=129 and q=115;

M_k=151 and q=69;

M_k=151 and q=82;

M_k=223 and q=83;

or

M_k=223 and q=140.

6. The method according to claim 2, wherein the reference signal sequence is R_q(n), wherein the R_q(n) is determined according to R_q(n)=e^j·

α

·

nX_q(n mod M_k), wherein

n is an integer and 0≤

n≤

N−

1, wherein N represents a length of the reference signal sequence, N is an integer greater than 1; and

α

represents a phase of linear phase rotation, and α

is a real number.

7. The method according claim 1, wherein

the frequency domain resource comprises a first frequency domain resource group and a second frequency domain resource group, wherein the second frequency domain resource group and the first frequency domain resource group comprise a same quantity of a basic time-frequency resource unit and have no overlapping of the basic time-frequency resource unit;

the reference signal sequence comprises a first reference signal sequence and a second reference signal sequence; and

the first reference signal sequence is mapped to the first frequency domain resource group, and the second reference signal sequence is mapped to the second frequency domain resource group.

8. A communications apparatus, comprising:

a processing unit, configured to convert a frequency domain reference signal from a frequency domain to a time domain, to generate a time domain reference signal, wherein the frequency domain reference signal comprises a reference signal sequence mapped to a frequency domain resource, wherein the reference signal sequence is determined based on a Zadoff-Chu sequence, and wherein a length value of the Zadoff-Chu sequence is selected from at least two length values; and

a sending unit, configured to send the time domain reference signal.

9. The communications apparatus according to claim 8, wherein the Zadoff-Chu sequence is X_q(m), wherein the X_q(m) is determined according to

10. The communications apparatus according to claim 9, wherein a value of q comprises one or more of:

11. The communications apparatus according to claim 9, wherein a value of q comprises one or more of:

q=q′

;

or

q=M_k−

q′

, wherein

M_k mod q′

=1 or M_k mod q′

=q′

−

1, and wherein 1≤

q′

≤

└

M_k/2┘

.

12. The communications apparatus according to claim 9, wherein a length of the reference signal sequence is 48, wherein a value of M_k and a value of q of the Zadoff-Chu sequence are one type in a parameter value set, wherein the value of M_k in the parameter value set has at least two different values, and wherein the parameter value set comprises at least two of:

M_k=47 and q=1;

M_k=47 and q=8;

M_k=47 and q=12;

M_k=47 and q=14;

M_k=47 and q=16;

M_k=47 and q=17;

M_k=47 and q=19;

M_k=47 and q=21;

M_k=47 and q=23;

M_k=47 and q=24;

M_k=47 and q=26;

M_k=47 and q=28;

M_k=47 and q=30;

M_k=47 and q=31;

M_k=47 and q=33;

M_k=47 and q=35;

M_k=47 and q=39;

M_k=47 and q=46;

M_k=87 and q=37;

M_k=87 and q=50;

M_k=117 and q=10;

M_k=117 and q=107;

M_k=125 and q=27;

M_k=125 and q=98;

M_k=129 and q=14;

M_k=129 and q=115;

M_k=151 and q=69;

M_k=151 and q=82;

M_k=223 and q=83;

or

M_k=223 and q=140.

13. The communications apparatus according to claim 9, wherein the reference signal sequence is R_q(n), wherein the R_q(n) is determined according to R_q(n)=e^j·

α

·

nX_q(n mod M_k), wherein

n is an integer and 0≤

n≤

N−

1, wherein N represents a length of the reference signal sequence, N is an integer greater than 1; and

α

represents a phase of linear phase rotation, and α

is a real number.

14. The communications apparatus according to claim 9, wherein

the frequency domain resource comprises a first frequency domain resource group and a second frequency domain resource group, and the second frequency domain resource group and the first frequency domain resource group comprise a same quantity of a basic time-frequency resource unit and have no overlapping of the basic time-frequency resource unit;

the reference signal sequence comprises a first reference signal sequence and a second reference signal sequence; and

the first reference signal sequence is mapped to the first frequency domain resource group, and the second reference signal sequence is mapped to the second frequency domain resource group.

15. A non-transitory computer readable storage medium, configured to store instructions, wherein when the instructions run on a computer, the computer performs operations comprising:

converting a frequency domain reference signal from a frequency domain to a time domain, to generate a time domain reference signal, wherein the frequency domain reference signal comprises a reference signal sequence mapped to a frequency domain resource, wherein the reference signal sequence is determined based on a Zadoff-Chu sequence, and wherein a length value of the Zadoff-Chu sequence is selected from at least two length values; and

sending the time domain reference signal.

16. The non-transitory computer readable storage medium of claim 15, wherein the Zadoff-Chu sequence is X_q(m), wherein the X_q(m) is determined according to

17. The non-transitory computer readable storage medium of claim 16, wherein a value of q comprises one or more of:

18. The non-transitory computer readable storage medium of claim 16, wherein a length of the reference signal sequence is 48, wherein a value of M_k and a value of q of the Zadoff-Chu sequence are one type in a parameter value set, wherein the value of M_k in the parameter value set has at least two different values, and wherein the parameter value set comprises at least two of:

M_k=47 and q=1;

M_k=47 and q=8;

M_k=47 and q=12;

M_k=47 and q=14;

M_k=47 and q=16;

M_k=47 and q=17;

M_k=47 and q=19;

M_k=47 and q=21;

M_k=47 and q=23;

M_k=47 and q=24;

M_k=47 and q=26;

M_k=47 and q=28;

M_k=47 and q=30;

M_k=47 and q=31;

M_k=47 and q=33;

M_k=47 and q=35;

M_k=47 and q=39;

M_k=47 and q=46;

M_k=87 and q=37;

M_k=87 and q=50;

M_k=117 and q=10;

M_k=117 and q=107;

M_k=125 and q=27;

M_k=125 and q=98;

M_k=129 and q=14;

M_k=129 and q=115;

M_k=151 and q=69;

M_k=151 and q=82;

M_k=223 and q=83;

or

M_k=223 and q=140.

19. The non-transitory computer readable storage medium of claim 16, wherein the reference signal sequence is R_q(n), wherein the R_q(n) is determined according to R_q(n)=e^j·

α

·

nX_q(n mod M_k), wherein

n is an integer and 0≤

n≤

N−

1, wherein N represents a length of the reference signal sequence, N is an integer greater than 1; and

α

represents a phase of linear phase rotation, and α

is a real number.

20. The non-transitory computer readable storage medium of claim 16, wherein

the frequency domain resource comprises a first frequency domain resource group and a second frequency domain resource group, wherein the second frequency domain resource group and the first frequency domain resource group comprise a same quantity of a basic time-frequency resource unit and have no overlapping of the basic time-frequency resource unit;

the reference signal sequence comprises a first reference signal sequence and a second reference signal sequence; and

the first reference signal sequence is mapped to the first frequency domain resource group, and the second reference signal sequence is mapped to the second frequency domain resource group.