High efficiency distributed device-to-device (D2D) channel access

摘要

Techniques for facilitating device-to-device (D2D) communications using a high efficiency distributed channel access scheme are generally described herein. In some examples, a communication zone allocated for wireless D2D communications is divided into resource contention and scheduled transmission portions. The resource contention segment may be used to transmit a request message from a transmitting device to a receiving device (a request-to-send message), and transmit a response to the request message from the receiving device to the transmitting device (a clear-to-send message). The response can indicate a time for the data transmission to occur during the scheduled transmission segment. During the scheduled transmission segment, the scheduled data transmission and other D2D data transmissions among the various devices will be performed. In further examples, contention access techniques may be used during the resource contention segment to manage access to the resource channel.

主权项

1. A user equipment (UE), comprising:
physical layer circuitry arranged to communicate with an evolved Node B (eNodeB) using a 3GPP Long Term Evolution (LTE) or Long-Term Evolution-Advanced (LTE-A) network connection and to facilitate device-to-device communications with a receiving UE using a direct network connection; and media-access control (MAC) layer circuitry arranged to: send via physical layer (PHY) circuitry a request message to a receiving UE, during a resource contention window allocated from a device-to-device portion of an uplink segment of an LTE or LTE-A frame, the resource contention window allocated for scheduling device-to-device communications in a wireless channel using a random access contention channel access technique, the request message indicating a size for a data transmission; receive a response to the request message via the PHY layer circuitry from the receiving UE, the response confirming the request message and designating a transmission time for the data transmission, the designated transmission time determined by the receiving UE and occurring within a first portion of a scheduled transmission window of the device-to-device portion of the uplink segment, the scheduled transmission window allocated for conducting the device-to-device communications, and wherein other devices may transmit in a second portion of the scheduled transmission window; perform the data transmission with the receiving UE via the PHY layer circuitry, during the scheduled transmission window allocated for conducting the device-to-device communications, on the wireless channel at the designated transmission time; and refrain from transmitting during the second portion of the scheduled transmission window.