Methods and device for performing device-to-device communication

摘要

Disclosed are methods for carrying out device-to-device (“D2D”) communication. In one implementation, a user equipment (“UE”) communicates D2D with another UE using uplink radio resources. The first UE receives a downlink signal from a base station and determines the reception time. The first UE also receives a timing advance for uplink communication. Based on the reception time and the timing advance, the first UE determines an uplink transmission time. When transmitting to the second UE, however, the first UE does not transmit at the determined UL transmission time. Rather, the first UE delays its D2D transmission for a period of time that is based on the second UE's uplink timing advance.

主权项

1. In a wireless network that includes a base station, a method for a first UE to perform device-to-device communication with a second UE, the method comprising:
receiving a downlink signal from the base station; determining the reception time of the downlink signal; receiving an indication of a timing advance for uplink communications from the first UE to the base station; based on the determined downlink signal reception time and the indicated timing advance, determining an uplink transmission time for the first UE for uplink communications to the base station; and delaying, by a period of time relative to the determined uplink transmission time, device-to-device transmissions to the second UE, wherein the period of time is calculated, in part, by adding the timing advance for uplink communications from the first UE to the base station and a timing advance applied by the second UE for uplink communications to the base station.