Signal designs for D2D subframes
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.
1. A user equipment (UE), comprising:
one or more antennas; and
communication circuitry, coupled with the one or more antennas, the communication circuitry to transmit, via at least one of the one or more antennas, a device-to-device (D2D) subframe to another UE at a Timing (T) ahead of a downlink reference time (T 1 ) with a Timing Advance (TA), where T=(T 1 −TA) and the downlink reference time is associated with a serving cell provided by a base station with which the UE is communicatively coupled, and
wherein the D2D subframe does not include a last data symbol of the subframe.
2. The UE of claim 1 , wherein the Timing Advance (TA) is at least 624 basic time units, where one basic time unit equals to 1/30720000 seconds.
3. The UE of claim 1 , wherein the communication circuitry is to communicate with the other UE via a time division duplex (TDD) deployment.
4. The UE of claim 1 , wherein the last data symbol not transmitted by the communication circuitry is a Single Carrier Frequency-Division Multiple Access (SC-FDMA) symbol.
5. The UE of claim 1 , wherein the communication circuitry is to communicate with the other UE via D2D communication without involvement of the base station.
6. The UE of claim 1 , wherein the communication circuitry is to receive a first value from the base station, and
wherein a processing circuitry included in the UE is to determine the Timing Advance (TA) based on the first value.
7. The UE of claim 1 , wherein the Timing Advance (TA) equals (N_TA+624)*basic time units (Ts), and
wherein the N_TA is predetermined by the base station.
8. The UE of claim 7 , wherein the UE is to schedule a switch from reception to transmission within a time period of the TA.
9. A user equipment (UE), comprising:
one or more antennas; and
communication circuitry, coupled with the one or more antennas, the communication circuitry to receive, via at least one of the one or more antennas, a device-to-device (D2D) subframe from another UE at a Timing (T) ahead of a downlink reference time (T 1 ) with a Timing Advance (TA), where T=(T 1 −TA) and the downlink reference time is associated with a serving cell provided by a base station with which the UE is communicatively coupled, and
wherein the D2D subframe does not include a last data symbol of the subframe.
10. The UE of claim 9 , wherein the Timing Advance (TA) is at least 624 basic time units, where one basic time unit equals to 1/30720000 seconds.
11. The UE of claim 9 , wherein the communication circuitry is to communicate with the other UE via a time division duplex (TDD) deployment.
12. The UE of claim 9 , wherein the last data symbol is a Single Carrier Frequency-Division Multiple Access (SC-FDMA) symbol.
13. The UE of claim 9 , wherein the communication circuitry is to communicate with the other UE via D2D communication without involvement of the base station.
14. The UE of claim 9 , wherein the Timing Advance (TA) equals (N_TA+624)*basic time units (Ts), and
wherein the N_TA is predetermined by the base station.
15. The UE of claim 9 , wherein the UE is to schedule a switch from reception to transmission within a time period of the TA.
16. A processor for a user equipment (UE), the processor comprising:
circuitry configured to execute one or more instructions to perform operations comprising:
communicating, via one or more antennas of the UE, a device-to-device (D2D) subframe from another UE at a Timing (T) ahead of a downlink reference time (T 1 ) with a Timing Advance (TA), where T=(T 1 −TA) and the downlink reference time is associated with a serving cell provided by a base station with which the UE is communicatively coupled, and
wherein the D2D subframe does not include a last data symbol of the subframe.
17. The processor of claim 16 , wherein the Timing Advance (TA) is at least 624 basic time units, where one basic time unit equals to 1/30720000 seconds.
18. The processor of claim 16 , wherein the circuitry is to communicate with the other UE via a time division duplex (TDD) deployment, and
wherein the last data symbol is a Single Carrier Frequency-Division Multiple Access (SC-FDMA) symbol.
19. The processor of claim 16 , wherein the Timing Advance (TA) equals (N_TA+624)*basic time units (Ts), and
wherein the N_TA is predetermined by the base station.
20. The processor of claim 16 , wherein the processor is to schedule a switch from reception to transmission within a time period of the TA.