Device to device communication method using partial device control

• US 9,635,684 B2
• Filed: 04/26/2013
• Issued: 04/25/2017
• Est. Priority Date: 04/26/2012
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Ko, Young Jo, Ahn, Jae Young, Seo, Bang Won, Noh, Tae Gyun
• Primary Examiner(s): Choi, Eunsook
• Application Number:
  US14/387,998
• Publication Number:
  US 20150078279A1
• Time in Patent Office: 1,460 Days
• Field of Search: None
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/24 Testing correct operation
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

A device to device (D2D) communication method based on a partial device control is disclosed. According to the present invention, the D2D communication method and, particularly, to a partial device control method for D2D communication a relates to, and provides a D2D resource allocation and release method, a D2D HARQ process operating method, a link adaptation method comprising D2D link power control and adaptive modulation and coding (AMC), a D2D control information signaling method, a CSI reporting method for D2D communication, and contents of a CSI report. The present invention can enhance the advantages of and compensate for the disadvantages of both methods through the combination of a base station control a base station control type D2D communication method and a device control type D2D communication method.

Claims

1. A device-to-device (D2D) communication method as an operation method of a first user equipment (UE) performing D2D communication through a D2D link in which the first UE and a second UE participate, the D2D communication method comprising:

detecting grant information in subframe n received from the second UE; and

when grant information is detected, demodulating data included in subframe n on the basis of the detected grant information, and transmitting positive acknowledgement/negative acknowledgement (ACK/NACK) information on whether or not demodulation of the data has succeeded to the second UE in subframe n+k, and

when no grant information is detected, data demodulation is attempted on the basis of existing grant information.

2. The D2D communication method of claim 1, wherein the grant information includes at least some of a number of transmission (Tx) layers of the D2D link, codeword-specific new data indicators (NDIs) of the D2D link, codeword-specific redundancy versions (RVs) of the D2D link, codeword-specific modulation and coding schemes (MCSs) of the D2D link, and a power control command.

3. The D2D communication method of claim 1, wherein the ACK information on whether or not demodulation of the data has succeeded also indicates success in detecting the grant information.

4. The D2D communication method of claim 1, further comprising transmitting additional ACK/NACK information on whether or not grant information has been detected to the second UE in subframe n+k.

5. The D2D communication method of claim 1, wherein the grant information is received through a separate control channel region different from a D2D data channel (D2D-physical uplink shared channel (PUSCH)) region of subframe n.

6. The D2D communication method of claim 1, wherein the grant information is included in a D2D data channel (D2D-physical uplink shared channel (PUSCH)) region of subframe n together with the data and received, and received through resources in the D2D-PUSCH region other than resources occupied by the data.

8. The D2D communication method of claim 1, further comprising, when detection of grant information fails, transmitting the ACK/NACK information on whether or not demodulation of the data has succeeded to the second UE in subframe n+k.

9. The D2D communication method of claim 1, further comprising, when detection of grant information fails, transmitting no ACK/NACK information on whether or not demodulation of the data has succeeded to the second UE.

7. A device-to-device (D2D) communication method as an operation method of a first user equipment (UE) performing D2D communication through a D2D link in which the first UE and a second UE participate, the D2D communication method comprising:

detecting grant information in subframe n received from the second UE; and

when grant information is detected, demodulating data included in subframe n on the basis of the detected grant information, and transmitting positive acknowledgement/negative acknowledgement (ACK/NACK) information on whether or not demodulation of the data has succeeded to the second UE in subframe n+k,

wherein the grant information is included in a D2D data channel (D2D-physical uplink shared channel (PUSCH)) region of subframe n together with the data and received, and received through resources in the D2D-PUSCH region other than resources occupied by the data, and

wherein the grant information is received using the same number of transmission (Tx) layers and the same modulation and coding scheme (MCS) as the data in the D2D data channel (D2D-PUSCH) region of subframe n.