METHOD AND APPARATUS FOR DEVICE-TO-DEVICE HARQ PROCESS MANAGEMENT

• US 20160095133A1
• Filed: 09/24/2015
• Published: 03/31/2016
• Est. Priority Date: 09/25/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: HWANG, June, JEONG, Kyeongin, CHANG, Youngbin, RYU, Hyunseok
• Granted Patent: US 9,930,684 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The present disclosure relates to a pre-5^th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4^th-Generation (4G) communication system such as Long Term Evolution (LTE). A method and an apparatus that may repeatedly transmit signals to cope with and reduce transmission errors in device-to-device (D2D) communication are provided. The method includes receiving, upon generation of data to be transmitted to a receiving user equipment (UE) (RX UE), allocation of resources to be used for D2D communication, transmitting a scheduling assignment (SA) containing identification information of at least one RX UE to the at least one RX UE, assigning at least one hybrid automatic repeat request (HARQ) process for the identification information of the at least one RX UE, and transmitting data to the at least one RX UE based on the HARQ process. Accordingly, it is possible to remove factors causing system performance degradation when retransmission operation for communication between a UE and a base station (eNB) is introduced to D2D communication.

Claims

1. A method of communication for a transmitting user equipment (TX UE), the method comprising:

receiving, upon generation of data to be transmitted to a receiving UE (RX UE), allocation of resources to be used for device-to-device (D2D) communication;

transmitting a scheduling assignment (SA) containing identification information of at least one RX UE to the at least one RX UE;

assigning at least one hybrid automatic repeat request (HARQ) process for the identification information of the at least one RX UE; and

transmitting data to the at least one RX UE based on the HARQ process.

2. The method of claim 1, wherein the receiving of the allocation of resources comprises:

receiving access-related information from a base station (eNB);

transmitting, when data to be transmitted to the at least one RX UE is present, a resource allocation request message to the eNB; and

receiving allocation of resources from the eNB.

3. The method of claim 1, wherein the receiving of the allocation of resources comprises receiving allocation of resources from a resource pool pre-configured in the network based on system information.

4. The method of claim 1, wherein the receiving of the allocation of resources comprises:

determining whether to assign multiple HARQ processes for identification information of the RX UE according to the application having generated the data to be transmitted, and

receiving allocation of resources to be used for D2D communication based on the information on whether to assign multiple HARQ processes,

wherein the SA contains information on whether to assign multiple HARQ processes.

5. The method of claim 1, wherein the receiving of the allocation of resources further comprises receiving probability information that enables one RX UE having succeeded in reception to determine whether to perform retransmission to another RX UE.

6. A method of communication for a receiving user equipment (RX UE), the method comprising:

determining whether destination identification information contained in a scheduling assignment (SA) received from at least one TX UE is equal to identification information of the RX UE;

assigning a hybrid automatic repeat request (HARQ) process for the SA when the destination identification information is equal to the identification information of the RX UE; and

receiving data from the at least one TX UE based on the HARQ process.

7. The method of claim 6, wherein the receiving of the data comprises:

determining whether a redundancy version (RV) is successfully received from the TX UE; and

suspending, when the RV is successfully received, reception of the next RV until next data arrives.

8. The method of claim 6, wherein the receiving of the data comprises:

determining whether an RV is successfully received from the TX UE; and

generating, when the RV is successfully received, the next RV, and transmitting the generated next RV to another RX UE.

9. The method of claim 8, wherein the generating and transmitting of the next RV further comprises:

receiving probability information used by one RX UE having succeeded in reception to determine whether to perform retransmission to another RX UE; and

determining, when the RV is successfully received, whether to generate the next RV to be transmitted to another RX UE based on the probability information.

10. The method of claim 6, further comprising:

transmitting, when the SA indicates assignment of multiple HARQ processes, a response message for the received data to the TX UE.

11. A transmitting user equipment (TX UE) comprising:

a communication unit configured to communicate with another network entity; and

a control unit configured to control a process of;

receiving, upon generation of data to be transmitted to a receiving UE (RX UE), allocation of resources to be used for device-to-device (D2D) communication,

transmitting a scheduling assignment (SA) containing identification information of at least one RX UE to the at least one RX UE,

assigning at least one HARQ process for the identification information of the at least one RX UE, and

transmitting data to the at least one RX UE based on the hybrid automatic repeat request (HARQ) process.

12. The transmitting user equipment of claim 11, wherein the control unit is further configured to control a process of:

receiving access-related information from a base station (eNB),

transmitting, when data to be transmitted to the at least one RX UE is present, a resource allocation request message to the eNB, and

receiving allocation of resources from the eNB.

13. The transmitting user equipment of claim 11, wherein the control unit is further configured to control to receive allocation of resources from a resource pool pre-configured in the network based on system information.

14. The transmitting user equipment of claim 11, wherein the control unit is further configured to control a process of:

determining whether to assign multiple HARQ processes for identification information of the RX UE according to the application having generated the data to be transmitted, and

receiving allocation of resources to be used for D2D communication based on the information on whether to assign multiple HARQ processes,

wherein the SA contains information on whether to assign multiple HARQ processes.

15. The transmitting user equipment of claim 11, wherein the control unit is further configured to control to receive probability information that enables one RX UE having succeeded in reception to determine whether to perform retransmission to another RX UE.

16. A receiving user equipment (RX UE) comprising:

a communication unit configured to communicate with another network entity; and

a control unit configured to control a process of;

determining whether destination identification information contained in a scheduling assignment (SA) received from at least one TX UE is equal to identification information of the RX UE,

assigning a HARQ process for the SA when the destination identification information is equal to the identification information of the RX UE, and

receiving data from the at least one TX UE based on the hybrid automatic repeat request (HARQ) process.

17. The receiving user equipment of claim 16, wherein the control unit is further configured to control a process of:

determining whether a redundancy version (RV) is successfully received from the TX UE, and

suspending, when the RV is successfully received, reception of the next RV until next data arrives.

18. The receiving user equipment of claim 16, wherein the control unit is further configured to control a process of:

determining whether an RV is successfully received from the TX UE, and

generating, when the RV is successfully received, the next RV, and transmitting the generated RV to another RX UE.

19. The receiving user equipment of claim 18, wherein the control unit is further configured to control a process of:

receiving probability information that enables one RX UE having succeeded in reception to determine whether to perform retransmission to another RX UE, and

determining, when the RV is successfully received, whether to generate the next RV to be transmitted to another RX UE based on the probability information.

20. The receiving user equipment of claim 16, wherein, when the SA indicates assignment of multiple HARQ processes, the control unit is further configured to control to transmit a response message for the received data to the TX UE.