Reference signal transmission method and user equipment

• US 10,652,063 B2
• Filed: 07/12/2016
• Issued: 05/12/2020
• Est. Priority Date: 01/13/2014
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Jian
• Primary Examiner(s): Orgad, Edan
• Assistant Examiner(s): Maglo, Emmanuel K
• Application Number:
  US15/208,249
• Publication Number:
  US 20160323129A1
• Time in Patent Office: 1,400 Days
• Field of Search: None
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Embodiments of the present invention provide a reference signal transmission method and user equipment. The method includes: determining, by a first user equipment, a first identifier related to the first user equipment; determining, by the first user equipment, a first cyclic shift indication from to-be-selected cyclic shift indications according to the first identifier; determining, by the first user equipment, first reference signal according to the first cyclic shift indication and a preset base sequence; and sending, by the first user equipment, the first reference signal to second user equipment, thereby implementing reference signal transmission in D2D communication.

Claims

1. A user equipment comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

determine a first identifier related to the user equipment;

determine a first cyclic shift indication according to the first identifier;

determine a first reference signal according to the first cyclic shift indication and a preset base sequence; and

send the first reference signal to another user equipment,

wherein a kth cyclic shift indication is determined as the first cyclic shift indication according to k=modulo(m1,

     8),

wherein the first identifier comprises a single identifier of the user equipment,

wherein m1 is equal to a value of the first identifier, and

wherein the modulo(m1,

     8) indicates a remainder obtained by dividing m1 by 8.

2. The user equipment according to claim 1, wherein the instructions to determine a first cyclic shift indication according to the first identifier comprise instructions to determine the first cyclic shift indication according to a value of the first identifier and a first offset value, and wherein the first offset value is a cell identifier value of a cell in which the user equipment is located, an identifier value of a D2D cluster to which the user equipment belongs, or an offset value configured by a first communications device.

3. The user equipment according to claim 1, wherein the first reference signal is a demodulation reference signal.

4. The user equipment according to claim 1, wherein the base sequence is preconfigured and multiple cyclic shift indications are configured for the base sequence.

5. The user equipment according to claim 1, wherein the first identifier is one or more of the following identifiers:

a D2D identifier, an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI) of the user equipment, or the first identifier is a joint identifier configured for the same group or the same type of user equipment including the user equipment.

6. A user equipment comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

determine a first identifier related to the user equipment;

determine a first cyclic shift indication according to the first identifier;

determine a first reference signal according to the first cyclic shift indication and a preset base sequence; and

send the first reference signal to another user equipment,

wherein the instructions to determine the first cyclic shift indication according to modulo(m1,

     8) comprise instructions to determine the first cyclic shift indication according to a value of the first identifier and a value of a first parameter of a resource used to send the first reference signal,

wherein the modulo(m1,

     8) indicates a remainder obtained by dividing m1 by 8;

wherein the m1 according to a value of the first identifier and a first offset value, and

wherein the first offset value is a cell identifier value of a cell in which the user equipment is located, an identifier value of a D2D cluster to which the user equipment belongs, or an offset value configured by a first communications device.

7. The user equipment according to claim 6, wherein the instructions to determine the first cyclic shift indication according to a value of the first identifier and a value of a first parameter of a resource used to send the first reference signal comprise instructions to determine a kth cyclic shift indication among n preset cyclic shift indications as the first cyclic shift indication, where n is a quantity of the preset cyclic shift indications, m2 is a value determined on a basis of the value of the first identifier and the value of the first parameter according to a preset operation rule, and k=mod(m2, n), and wherein modulo(m2, n) indicates a remainder obtained by dividing m2 by n.

8. The user equipment according to claim 6, wherein the first parameter includes one or more of the following parameters corresponding to the resource:

a frame number, a subframe number, a physical resource block number, or bandwidth.

9. The user equipment according to claim 6, wherein the instructions to determine the first cyclic shift indication according to a value of the first identifier and a value of a first parameter of a resource used to send the first reference signal comprise instructions to determine the first cyclic shift indication according to the value of the first identifier, the value of the first parameter, and a first offset value, where the first offset value is a cell identifier value of a cell in which the user equipment is located, an identifier value of a D2D cluster to which the user equipment belongs, or an offset value configured by a first communications device.

10. The user equipment according to claim 6, wherein the first reference signal is a demodulation reference signal.

11. The user equipment according to claim 6, wherein the base sequence is preconfigured and multiple cyclic shift indications are configured for the base sequence.

12. The user equipment according to claim 6, wherein the first identifier is one or more of the following identifiers:

a D2D identifier, an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI) of the user equipment, or the first identifier is a joint identifier configured for a same group or a same type of user equipment including the user equipment.

13. A user equipment comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

determine a first identifier related to the user equipment;

determine a first cyclic shift indication according to the first identifier;

determine a first reference signal according to the first cyclic shift indication and a preset base sequence; and

send the first reference signal to another user equipment,

wherein a kth cyclic shift indication is determined as the first cyclic shift indication according to k=modulo(m1,

     8),

wherein the first identifier comprises at least two identifiers of the user equipment,

wherein m1 is a value determined on a basis of values of the at least two identifiers according to a preset operation rule, and

wherein the modulo(m1,

     8) indicates a remainder obtained by dividing m1 by 8.

14. The user equipment according to claim 13, wherein the instructions to determine a first cyclic shift indication according to the first identifier comprise instructions to determine the first cyclic shift indication according to a value of the first identifier and a first offset value, and wherein the first offset value is a cell identifier value of a cell in which the user equipment is located, an identifier value of a D2D cluster to which the user equipment belongs, or an offset value configured by a first communications device.

15. The user equipment according to claim 13, wherein the first reference signal is a demodulation reference signal.

16. The user equipment according to claim 13, wherein the base sequence is preconfigured and multiple cyclic shift indications are configured for the base sequence.

17. The user equipment according to claim 13, wherein the first identifier is one or more of the following identifiers:

a D2D identifier, an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI) of the user equipment, or the first identifier is a joint identifier configured for the same group or the same type of user equipment including the user equipment.