# US 10,375,727 B2 · Signal designs for D2D subframes

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- Number: US 10,375,727 B2
- Document ID: US10375727B2
- Status: Granted
- Kind: B2
- Application number: 15/492,844
- Filed: 2017-04-20
- Published: 2017-09-21
- Granted: 2019-08-06
- Earliest claimed: 2013-11-27
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Debdeep Chatterjee; Seunghee Han; Gang Xiong; Huaning Niu
- Web page: https://patentgrep.com/patent/US10375727B2

## CPC

- H04W 74/04: Scheduled access (hybrid access H04W74/02)
- H04B 7/2621: {using frequency division multiple access [FDMA] (H04B7/2615 takes precedence)}
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/1825: Adaptation of specific ARQ protocol parameters according to transmission conditions
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0073: {Allocation arrangements that take into account other cell interferences}
- H04L 5/0078: {Timing of allocation}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 5/1469: {using time-sharing}
- H04L 5/22: using time-division multiplexing
- H04L 27/2607: {Cyclic extensions}
- H04L 47/25: with rate being modified by the source upon detecting a change of network conditions
- H04L 69/161: {Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields}
- H04L 69/163: In-band adaptation of TCP data exchange; In-band control procedures
- H04L 69/321: Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
- H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC
- H04L 69/326: in the transport layer [OSI layer 4] (H04L69/16 takes precedence)
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 28/0205: {at the air interface (dynamic wireless traffic scheduling H04W72/12)}
- H04W 36/0069: {in case of dual connectivity, e.g. decoupled uplink/downlink}
- H04W 40/30: for proactive routing
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 52/0254: {detecting a user operation or a tactile contact or a motion of the device}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/51: based on terminal or device properties
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 16/24: Cell structures
- H04W 36/0083: {Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists}
- 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)}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points
- Y02D 30/50: in wire-line communication networks, e.g. low power modes or reduced link rate
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## 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

### Claim 1

A communication module, comprising:
a radio transceiver to communicate with another communication module via a device-to-device (D2D) communication; and
processing circuitry, coupled to the radio transceiver, to:
schedule a D2D subframe to be transmitted at a timing advance (TA), which is at least 624 basic time units (Ts), ahead of a serving cell downlink reference time, wherein one basic time unit equals 1/30720000 seconds;
receive a first value from an eNB and determine the TA based on the first value;
transmit, via the radio transceiver, information to the other communication module using the D2D subframe: and
generate a guard interval within the D2D subframe by not transmitting at least a part of a data symbol of the D2D subframe.

### Claim 2 (depends on 1)

The communication module of claim 1, wherein,
the radio transceiver is to communicate with the other communication module via a time division duplex (TDD) deployment.

### Claim 3 (depends on 1)

The communication module of claim 1, wherein,
the radio transceiver is to communicate with the other communication module via the D2D communication without involvement of the eNB.

### Claim 4 (depends on 1)

The communication module of claim 1, wherein,
the processing circuitry is to schedule a switch from reception to transmission within a time period of the TA.

### Claim 5

A communication module comprising:
a radio transceiver to communicate with another communication module via a device-to-device (D2D) communication: and
processing circuitry, coupled to the radio transceiver, to:
schedule a D2D subframe to be transmitted with a timing advance (TA), which is at least 624 basic time units (Ts), ahead of a serving cell downlink reference time,
wherein one basic time unit equals 1/30720000 seconds, the TA equals (NTA +624)*Ts, and the NTA is a value predetermined by the communication module.

### Claim 6

One or more non-transitory, computer-readable media having instructions that when executed, cause a user equipment (UE) to:
determine a downlink reference time based on timing of a serving cell transmission;
schedule a device-to-device (D2D) subframe to be transmitted at a timing advance (TA), which is at least 624 basic time units, ahead of the downlink reference time, wherein one basic time unit (Ts) equals 1/30720000 seconds and the UE is to receive a first value from an eNB and determine the TA based on the first value;
transmit information to another UE using the D2D subframe; and
cause the UE to perform a switching between reception and transmission within a time period of the TA,
wherein the instructions, when executed, further cause the UE to not transmit an entirety of a last Single Carrier Frequency-Division Multiple Access (SC-FDMA) symbol of the D2D subframe.

### Claim 7 (depends on 6)

The one or more non-transitory, computer-readable media of claim 6, wherein the UE is to communicate with the other UE using a time division duplex (TDD) deployment.

### Claim 8 (depends on 6)

The one or more non-transitory, computer-readable media of claim 6, wherein the
TA equals (NTA +624)*Ts , and NTA is a value predetermined by a communication network.

### Claim 9

One or more non-transitory, computer-readable media having instructions that, when executed, cause a user equipment (UE) to:
determine a downlink reference time based on timing of a serving cell transmission;
schedule a device-to-device (D2D) subframe to be transmitted at a timing advance (TA), which is at least 624 basic time units, ahead of the downlink reference time, wherein one basic time unit (Ts) equals 1/30720000 seconds and the UE is to receive a first value from an eNB and determine the TA based on the first value;
transmit information to another UE using the D2D subframe: and
generate a guard interval within the D2D subframe by not transmitting at least a part of a data symbol of the D2D subframe.

### Claim 10 (depends on 9)

The one or more non-transitory, computer-readable media of claim 9, wherein the instructions, when executed, further cause the UE to: generate the guard interval of at least 66.67 μs.