Abstract
Physical layer processing and procedures for device-to-device (D2D) discovery signal generation and transmission and scheduling of D2D discovery signals are described. Detection and measurement of a D2D discovery signal, D2D signal identity management, and monitoring by a wireless transmit/receive unit (WTRU) of PDCCH for D2D discovery scheduling is described, as is a WTRU that may be configured with a D2D-specific transmission/reception opportunity pattern. The discovery signal may carry a payload for explicit information about user and/or service identity, and may be mapped to physical resources in such a way as to decouple transmission/reception of the discovery signal from downlink operations. A WTRU may measure a D2D discovery signal quality and report to the network.
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4G | 25/09/2014 | ISLD-201409-028 | INTERDIGITAL INC |
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4G | 30/12/2019 | ISLD-201912-087 | INTERDIGITAL INC |
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5G | 14/12/2020 | ISLD-202012-039 | INTERDIGITAL INC |
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5G | 29/09/2021 | ISLD-202109-030 | INTERDIGITAL INC |
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Specification Information
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WO2014113537A1 | 4G | 25/09/2014 | ISLD-201409-028 | INTERDIGITAL INC |
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WO2014113537A1 | 4G | 30/12/2019 | ISLD-201912-087 | INTERDIGITAL INC |
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Technologies
Product
Use Cases
Services
Claim
1. A method associated with a device-to-device transmission by a wireless transmit/receive device (WTRU), the method comprising:
receiving a device-to-device transmission configuration from a network via a system information block (SIB) or via dedicated signaling, wherein the device-to-device transmission configuration indicates device-to-device resources;
randomly selecting a device-to-device transmission resource from the indicated device-to-device resources;
determining a transmit power of the device-to-device transmission based on an estimated path loss to a cell;
determining a device-to-device transmission frame timing, wherein the device-to-device transmission frame timing is determined using a radio frame as a reference; and
transmitting the device-to-device transmission using the randomly selected device-to-device transmission resource in accordance with the determined transmit power of the device-to-device transmission and the determined device-to-device transmission frame timing, wherein the device-to-device transmission includes a guard period.
2. The method of claim 1, wherein the device-to-device transmission configuration comprises a resource offset indicating offset of the device-to-device transmission resource, wherein the resource offset depends on a system frame number (SFN) and a subframe number.
3. The method of claim 2, wherein the device-to-device transmission configuration further comprises a bitmap of a device-to-device resource occasion, and size as a number of physical resource blocks (PRBs).
4. The method of claim 1, wherein the serving cell used to estimate path loss is configured via radio resource control (RRC) signaling.
5. The method of claim 1 further comprising receiving, via radio resource control (RRC) signaling, a configuration for path loss compensation.
6. The method of claim 5, wherein the transmit power of the device-to-device transmission is further determined using the configuration for path loss compensation.
7. The method of claim 1, wherein the guard period occupies the last symbol of a subframe associated with the device-to-device transmission.
8. The method of claim 1, wherein the radio frame is a downlink (DL) radio frame associated with the cell.
9. A wireless transmit/receive device (WTRU) comprising:
a processor configured to at least:
receive a device-to-device transmission configuration from a network via a system information block (SIB) or via dedicated signaling, wherein the device-to-device transmission configuration indicates device-to-device resources;
randomly select a device-to-device transmission resource from the indicated device-to-device resources;
determine transmit power of a device-to-device transmission based on an estimated path loss to a cell;
determine a device-to-device transmission frame timing, wherein the device-to-device transmission frame timing is determined using a radio frame as a reference; and
transmit the device-to-device transmission using the randomly selected device-to-device transmission resource in accordance with the determined transmit power of the device-to-device transmission and the determined device-to-device transmission frame timing, wherein the device-to-device transmission includes a guard period.
10. The WTRU of claim 9, wherein the device-to-device transmission configuration comprises a resource offset indicating offset of the device-to-device transmission resource, wherein the resource offset depends on a system frame number (SFN) and a subframe number.
11. The WTRU of claim 10, wherein the device-to-device transmission configuration further comprises a bitmap of a D2D resource occasion, and size as a number of physical resource blocks (PRBs).
12. The WTRU of claim 9, wherein the serving cell used to estimate path loss is configured via radio resource control (RRC) signaling.
13. The WTRU of claim 9, wherein the processor is configured to receive, via radio resource control (RRC) signaling, a configuration for path loss compensation.
14. The WTRU of claim 13, wherein the transmit power of the device-to-device transmission is further determined using the configuration for path loss compensation.
15. The WTRU of claim 9, wherein the guard period occupies the last symbol of a subframe associated with the device-to-device transmission.
16. The WTRU of claim 9, wherein the radio frame is a downlink (DL) radio frame associated with the cell.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.