Signal designs for D2D subframes

Patent metadata

Field	Value
Publication number	US-9681487-B2
Application number	US-201414498276-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Nov 27, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

Embodiments of the present disclosure describe apparatuses and methods for signal designs for device-to-device (D2D) subframes. Various embodiments may include a UE with a radio transceiver to communicate with another UE via D2D communications. The UE may further include processing circuitry to generate a cyclic prefix (CP) for a first or second symbol of a D2D subframe at an orthogonal frequency division multiplexing (OFDM) resource block or a single-carrier frequency-division multiple access (SC-FDMA) resource block. Other embodiments may be described and/or claimed.

First claim

What is claimed is:

1. A user equipment (UE), comprising:
a radio transceiver to communicate with another UE via device-to-device (D2D) communications; and
processing circuitry, coupled to the radio transceiver, to generate a cyclic prefix (CP) for a first or second symbol of a D2D subframe at an orthogonal frequency division multiplexing (OFDM) resource block or a single-carrier frequency-division multiple access (SC-FDMA) resource block, wherein the CP has a length greater than 33.33 microseconds; and to puncture a last symbol of the D2D subframe to provide a guard interval.

2. The UE of claim 1 , wherein the processing circuitry is further to puncture a first half of a useful symbol length of the first symbol and/or a second half of a useful symbol length of the last symbol of the D2D subframe.

3. The UE of claim 1 , wherein the processing circuitry is to use a second half of a useful symbol length of the first symbol, generated based on a second half of a useful symbol length of the second symbol, as a part of the CP for the second symbol.

4. The UE of claim 3 , wherein the processing circuitry is further to puncture an entirety of a last symbol of the D2D subframe, or to puncture a first half of the useful symbol length of the first symbol and a second half of a useful symbol length of the last symbol.

5. The UE of claim 1 , wherein the processing circuitry is to use a first half of a useful symbol length of the first symbol, generated based on a second half of the useful symbol length of the first symbol, as a part of the CP for the first symbol.

6. The UE of claim 1 , wherein the processing circuitry is to generate the CP having a length greater than 66.67 microseconds for the second symbol.

7. A user equipment (UE), comprising:
a radio transceiver to communicate with another UE via Long-Term Evolution (LTE) Proximity Services (ProSe) or LTE Direct; and
processing circuitry coupled to the radio transceiver to transmit a signal in a first symbol of a D2D subframe at an orthogonal frequency division multiplexing (OFDM) resource block or a single-carrier frequency-division multiple access (SC-FDMA) resource block, for automatic gain control (AGC) setting at a receiving UE,
wherein the processing circuitry is to use an uplink demodulation reference signal (UL-DMRS) as the signal in the first symbol, and wherein a base sequence and a cyclic shift of the UL-DMRS are same as those used for respective UL-DMRS on a fourth symbol and an eleventh symbol of the subframe.

8. The UE of claim 7 , wherein the processing circuitry is further to generate a cyclic prefix to be greater than 66.67 microseconds for a second symbol of the D2D subframe.

9. The UE of claim 7 , wherein the processing circuitry is to use a first half of a useful symbol length of the first symbol, generated based on a second half of the useful symbol length of the first symbol, as a part of a cyclic prefix for the first symbol; and to keep the UL-DMRS to a second half of the useful symbol length of the first symbol.

10. The UE of claim 7 , wherein the processing circuitry is to map the UL-DMRS to an entirety of a non-cyclic-prefix portion of the first symbol.

11. A user equipment (UE), comprising:
a radio transceiver to communicate with another UE via Long-Term Evolution (LTE) Proximity Services (ProSe) or LTE Direct; and
processing circuitry coupled to the radio transceiver to transmit a signal in a first symbol of a D2D subframe at an orthogonal frequency division multiplexing (OFDM) resource block or a single-carrier frequency-division multiple access (SC-FDMA) resource block, for automatic gain control (AGC) setting at a receiving UE, wherein the processing circuitry is to use an AGC reference signal as the signal, wherein the AGC reference signal is a sequence that has a peak-to-average-power-ratio (PAPR) and is common to a plurality of transmitting UEs, and wherein the AGC reference signal is defined on a per-resource block or on a per-resource block set basis.

12. The UE of claim 11 , wherein the processing circuitry is to puncture a first half of a useful symbol length of the first symbol.

13. A user equipment (UE), comprising:
a radio transceiver to communicate with another UE via device-to-device (D2D) communications; and
processing circuitry, coupled to the radio transceiver, to schedule a D2D subframe to be transmitted at least 624 basic time units ahead of a corresponding reference time of the D2D subframe, wherein one basic time unit equals 1/30720000 seconds,
wherein the corresponding reference time is a serving cell uplink reference time (SCURT) in a time division duplex deployment, wherein SCURT=SCDRT−TA, wherein SCDRT is a serving cell downlink reference time, and TA is an active timing advance valuent.

14. The UE of claim 13 , wherein the corresponding reference time is a serving or camping cell downlink reference time in a time division duplex deployment.

15. The UE of claim 13 , wherein the processing circuitry is to schedule the D2D subframe to be transmitted at 624 basic time units ahead of a serving or camping cell downlink reference time in a time division duplex deployment.

16. The UE of claim 13 , wherein the processing circuitry is further to puncture a last symbol of the D2D subframe.

Assignees

• Intel Corp

Inventors

• Chatterjee Debdeep
• Han Seunghee
• Xiong Gang
• Niu Huaning

Classifications

• H04W72/51

  based on terminal or device properties · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title