name: A2X
full_form: Aircraft-to-anything
context: Unicast mode Direct C2 Communication has the same requirements and procedures as unicast mode A2X Direct Communication (see clause 5.6.2 of the present specification) with the following exception: - The A2X Policy Provisioning is done based on TS 23.256 [3] Clause 6.2.1 and the A2X Policy includes A2X security policy for each A2X services (e.g., C2 and DAA). The C2 service specific security policy available as part of A2X security policy is used for the security establishment (i.e. included in the direct communication request and is further replayed in the Direct security mode command to provide protection against bidding down attacks as described in TS 33.536 [7]), where the signalling and user plane confidentiality and integrity are set as required based on local policy.
description: A2X (Aircraft-to-anything) is a service that enables direct communication between aircraft and any other entity, including other aircraft or ground-based systems. It involves the exchange of data and signaling messages to establish secure connections and ensure confidentiality and integrity of communications.
explanation: The context describes A2X as a service that facilitates communication between various entities, emphasizing its role in establishing secure connections and data exchange. This aligns with the definition of a telecommunications service.
section_title: 5.7.2	Unicast mode Direct C2 Communication
biotag_Context: O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,B-Specification,O,O,O,O,O,O,B-Technology,O,O,B-Technology,O,O,O,O,B-Technology,O,O,B-Service,O,O,O,B-Service,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Specification,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O
biotag_Description: B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O