name: D2D
full_form: Device to Device
context: According to working assumptions documented in TS 36.300 [239], following assumptions are relevant to the ProSe one-to-many Direct Communication charging: - Public Safety one-to-many D2D broadcast communication should be possible irrespective of availability of infrastructure coverage. - It is assumed that one-to-many D2D broadcast communication should be supported both on a dedicated carrier and on the same carrier as regular LTE. - When transmitting UEs are in-coverage, the UE may use eNB scheduled resources (Mode 1) or UE autonomous selected resources (Mode 2) based one configuration from eNB. The UE may use Mode 2 in coverage under exceptional cases, e.g. fail to establish RRC connection, even if eNB configures it to use Mode 1. - When transmitting UEs are out-of-coverage, the resources used for D2D broadcast data are selected from a resource pool. The resource pool can be pre-configured, or semi-statically configured. - No Access Stratum signalling is required for group formation
description: Device-to-Device (D2D) communication enables the direct exchange of data between two or more devices without utilizing traditional network infrastructure like cellular networks. In ProSe one-to-many Direct Communication, D2D facilitates public safety broadcasts, allowing devices to communicate even in areas lacking infrastructure coverage.
explanation: The text describes D2D as a method for direct device communication within the context of telecommunications technologies, particularly for public safety broadcasting.
section_title: 4.1.3RAN aspects of ProSe one-to-many Direct Communication assumptions
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