Content for TS 24.577 Word version: 18.1.0

1 Scope p. 11

The present document specifies the protocols for aircraft-to-everything (A2X) communication as specified in TS 23.256 for A2X services among the UEs over the PC5 interface and over Uu.

2 References p. 11

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode".

[3]

TS 23.256: "Support of Uncrewed Aerial Systems (UAS) connectivity, identification and tracking; Stage 2"

[4]

TS 23.285: "Architecture enhancements for V2X services".

[5]

TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services); Stage 2".

[6]

TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".

[7]

TS 24.501: " Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3"

[8]

TS 24.578: "Aircraft-to-Everything (A2X) services in 5G System (5GS); UE policies".

[9]

TS 24.587: "Vehicle-to-Everything (V2X) services in 5G System (5GS); Protocol aspects; Stage 3".

[10]

TS 33.256: "Security aspects of Uncrewed Aerial Systems (UAS)".

[11]

TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".

[12]

TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".

[13]

TS 38.304: "User Equipment (UE) procedures in Idle mode and RRC Inactive state".

[14]

TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) specification".

[15]

TS 38.331: "NR; Radio Resource Control (RRC) protocol specification".

[16]

RFC 4862: "Neighbor Discovery for IP version 6 (IPv6)".

[17]

ASTM F3411.19: "Standard Specification for Remote ID and Tracking".

[18]

ASD-STAN prEN 4709-002:2022-03: "Aerospace series - Unmanned Aircraft Systems - Part 002: Direct Remote Identification".

[19]

TS 24.007: "Mobile radio interface signalling layer 3; General aspects".

[20]

RFC 4291: "IP Version 6 Addressing Architecture".

[21]

ISO TS 17419 ITS-AID AssignedNumbers: http://standards.iso.org/iso/ts/17419/TS17419%20Assigned%20Numbers/TS17419_ITS-AID_AssignedNumbers.pdf

[22]

RFC 4566: "SDP: Session Description Protocol".

[23]

RFC 768: "User Datagram Protocol".

[24]

RFC 793: "Transmission Control Protocol."

[25]

RFC 1035: "DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION".

[26]

TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".

[27]

TS 23.247: "Architectural enhancements for 5G multicast-broadcast services".

[28]

TS 23.032: "Universal Geographical Area Description (GAD)".

3 Definitions of terms, symbols and abbreviations p. 12

3.1 Terms p. 12

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

E-UTRA-PC5:

PC5 reference point over E-UTRA. The term E-UTRA-PC5 used in the present document corresponds to the term LTE PC5 defined in TS 23.256.

NR-PC5:

PC5 reference point over NR. The term NR-PC5 used in the present document corresponds to the term NR PC5 defined in TS 23.256.

For the purposes of the present document, the following terms and definitions given in TS 23.256 apply:

A2X communication

A2X message

A2X service

For the purposes of the present document, the following terms and definitions given in TS 38.331 apply:

MBS Radio Bearer

3.2 Abbreviations p. 12

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

For the purposes of the present document, the following terms and definitions given in TS 23.256 apply:

A2X

Aircraft-to-everything

A2XP

A2X Policy

BRID

Broadcast remote ID

DDAA

Direct detect and avoid

4 General description p. 13

The present specification defines means for transport of A2X messages, A2X Communication, and procedures for A2X services including BRID, DDAA, direct C2 communication and GBDAAA.

The A2X messages are generated and consumed by upper layers of the UE e.g., A2X application. A2X message can contain IP data or non-IP data. For IP data, only IPv6 is used for A2X messages sent over PC5. IPv4 is not supported in this release of specification for A2X messages sent over PC5.

The A2X message can be transported using A2X communication over PC5 or over Uu. A2X communication over PC5 supports both broadcast mode and unicast mode. Groupcast mode over PC5 and relay communication over PC5 is not supported in this release of specification. A2X communication over Uu supports both broadcast mode and unicast mode.