Signal designs for D2D subframes

• US 9,681,487 B2
• Filed: 09/26/2014
• Issued: 06/13/2017
• Est. Priority Date: 11/27/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Han, Seunghee, Xiong, Gang, Chatterjee, Debdeep, Niu, Huaning
• Primary Examiner(s): Jagannathan, Melanie
• Application Number:
  US14/498,276
• Publication Number:
  US 20150146647A1
• Time in Patent Office: 991 Days
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 47/25 with rate being modified by the source upon detecting a change of network conditions
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0078 Timing of allocation
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04L 5/22 using time-division multiplexing
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures
• CPC Class Codes: H04L 69/321 Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04L 69/326 in the transport layer [OSI layer 4] H04L69/16 takes precedence
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 28/0205 : at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 36/0069 : in case of dual connectivity, e.g. decoupled uplink/downlink
• CPC Class Codes: H04W 36/0083 : Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 40/30 : for proactive routing
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0254 : detecting a user operation or a tactile contact or a motion of the device
• CPC Class Codes: H04W 72/02 : Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 : based on terminal or device properties
• CPC Class Codes: H04W 74/04 : Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 80/06 : Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless transmission control protocol/Internet protocol [TCP/IP] or user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04W 84/12 : WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/06 : adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/10 : adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: Y02D 30/50 : in wire-line communication networks, e.g. low power modes or reduced link rate
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

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.

Claims

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.