Communication Method, User Equipment, and Network Device

• US 20160105791A1
• Filed: 12/17/2015
• Published: 04/14/2016
• Est. Priority Date: 07/26/2013
• 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, Xu, Kai, Wang, Ke
• Granted Patent: US 10,051,459 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 8/14 between corresponding nodes

Abstract

Embodiments relate to a communication method, user equipment, and a network device. A discovery message sent by second user equipment indicates cell information of the user equipment, so that first user equipment that receives the discovery message sends a communication request to a network device according to the discovery message. The communication request indicates the cell information of the second user equipment. The network device sends a paging message to the second user equipment according to a cell message of the second user equipment, which saves resources in a paging process of direct communication.

Claims

1. A user equipment, comprising:

a receiver, configured to receive a discovery message sent by a second user equipment, wherein the discovery message indicates cell information of the second user equipment;

a processor coupled to the receiver and configured to acquire the cell information of the second user equipment; and

a transmitter coupled to the processor and configured to send a communication request to a network device according to the discovery message, wherein the communication request is used to request to communicate with the second user equipment, and the communication request indicates the cell information of the second user equipment, so that the network device sends a paging message to the second user equipment according to the communication request and the cell information of the second user equipment.

2. The user equipment according to claim 1, wherein:

the cell information of the second user equipment comprises an identifier of a cell in which the second user equipment is located;

the discovery message indicating cell information of the second user equipment comprises the discovery message carrying the identifier of the cell in which the second user equipment is located; and

the processor is further configured to read the identifier, carried in the discovery message, of the cell in which the second user equipment is located.

3. The user equipment according to claim 1, wherein:

the cell information of the second user equipment comprises a discovery area identifier of the second user equipment;

the discovery message indicating cell information of the second user equipment comprises the discovery message carrying the discovery area identifier of the second user equipment; and

the processor is further configured to read the discovery area identifier of the second user equipment that is carried in the discovery message.

4. The user equipment according to claim 1, wherein:

the cell information of the second user equipment comprises a discovery area identifier of the second user equipment;

the discovery message indicating cell information of the second user equipment comprises the discovery message indicating the discovery area identifier of the second user equipment using a codeword resource; and

the processor is further configured to determine the discovery area identifier of the second user equipment according to a correspondence between the discovery area identifier and the codeword resource.

5. The user equipment according to claim 4, wherein:

the codeword resource comprises a scrambling codeword, and the correspondence between a discovery area identifier and the codeword resource comprises a correspondence between the discovery area identifier and the scrambling codeword; and

the processor is further configured to descramble the discovery message using the scrambling codeword, and determine that the scrambling codeword that is used to perform the descrambling successfully is the scrambling codeword used by the discovery message.

6. The user equipment according to claim 4, wherein:

the codeword resource comprises a demodulation reference symbol sequence, and the correspondence between the discovery area identifier and the codeword resource comprises a correspondence between the discovery area identifier and the demodulation reference symbol sequence; and

the processor is further configured to perform channel estimation and decoding on the discovery message by using the demodulation reference symbol sequence, and determine that the demodulation reference symbol sequence that is used to perform the channel estimation and decoding successfully is the demodulation reference symbol sequence used by the discovery message.

7. The user equipment according to claim 1, wherein:

the cell information of the second user equipment comprises a discovery area identifier of the second user equipment;

the discovery message indicating cell information of the second user equipment comprises the discovery message indicating the discovery area identifier of the second user equipment using a frequency resource of the discovery message; and

the processor is further configured to determine the discovery area identifier of the second user equipment according to a correspondence between the discovery area identifier and the frequency resource.

8. The user equipment according to claim 1, wherein:

the cell information of the second user equipment comprises a discovery area identifier of the second user equipment;

the discovery message indicating cell information of the second user equipment comprises the discovery message indicating the discovery area identifier of the second user equipment using a time resource of the discovery message; and

the processor is further configured to determine the discovery area identifier of the second user equipment according to a correspondence between the discovery area identifier and the time resource.

9. A user equipment, comprising:

a processor, configured to generate a discovery message; and

a transmitter coupled to the processor and configured to send the discovery message, wherein the discovery message indicates cell information of the user equipment, so that a first user equipment that receives the discovery message sends a communication request to a network device according to the discovery message, wherein the communication request is used to request to communicate with the user equipment, and the communication request indicates the cell information of the user equipment, so that the network device sends a paging message to the user equipment according to the communication request and the cell information of the user equipment.

10. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises an identifier of a cell in which the user equipment is located; and

the discovery message indicating cell information of the user equipment comprises the discovery message carrying the identifier of the cell in which the user equipment is located.

11. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment; and

the discovery message indicating cell information of the user equipment comprises the discovery message carrying the discovery area identifier of the user equipment.

12. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment;

the processor is further configured to determine, according to a correspondence between the discovery area identifier and a codeword resource, the codeword resource corresponding to the discovery area identifier of the user equipment;

the transmitter is further configured to send the discovery message using the codeword resource corresponding to the discovery area identifier of the user equipment; and

the discovery message indicating cell information of the user equipment comprises the discovery message indicating the discovery area identifier of the user equipment using the codeword resource.

13. The user equipment according to claim 12, wherein the codeword resource comprises a scrambling codeword, and the correspondence between the discovery area identifier and the codeword resource comprises a correspondence between the discovery area identifier and the scrambling codeword.

14. The user equipment according to claim 12, wherein the codeword resource comprises a demodulation reference symbol sequence, and the correspondence between the discovery area identifier and the codeword resource comprises a correspondence between the discovery area identifier and the demodulation reference symbol sequence.

15. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment;

the user equipment further comprises a first receiver, configured to acquire a codeword resource used by a current cell;

the transmitter is further configured to send the discovery message using the codeword resource used by the current cell; and

the discovery message indicating cell information of the user equipment comprises the discovery message indicating the discovery area identifier of the user equipment using the codeword resource.

16. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment;

the transmitter is further configured to;

determine, according to a correspondence between the discovery area identifier and a frequency resource, the frequency resource corresponding to the discovery area identifier of the user equipment; and

send the discovery message using the frequency resource corresponding to the discovery area identifier of the user equipment; and

the discovery message indicating cell information of the user equipment comprises;

the discovery message indicating the discovery area identifier of the user equipment using the frequency resource used by the discovery message.

17. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment;

the user equipment further comprises a second receiver, configured to acquire a frequency resource used by a current cell;

the transmitter is further configured to send the discovery message using the frequency resource used by the current cell; and

the discovery message indicating cell information of the user equipment comprises the discovery message indicating the discovery area identifier of the user equipment using the frequency resource used by the discovery message.

18. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment;

the transmitter is further configured to;

determine, according to a correspondence between a discovery area identifier and a time resource, the time resource corresponding to the discovery area identifier of the user equipment; and

send the discovery message using the time resource corresponding to the discovery area identifier of the user equipment; and

the discovery message indicating cell information of the user equipment comprises the discovery message indicating the discovery area identifier of the user equipment using the time resource used by the discovery message.

19. The user equipment according to claim 9, wherein:

the cell information of the user equipment comprises a discovery area identifier of the user equipment;

the user equipment further comprises a third receiver, configured to acquire a time resource used by a current cell;

the transmitter is further configured to send the discovery message using the time resource used by the current cell; and

the discovery message indicating cell information of the user equipment comprises the discovery message indicating the discovery area identifier of the user equipment using the time resource used by the discovery message.