GUIDANCE MATERIAL 2.1 Concept of Operations 2.1.1 Introduction 2.1.1.1 AeroMACS can potentially support the wide variety services of video, and data communications and information exchanges among fixed and mobile users at the airport. 2.1.1.2 The applications and communications provided by AeroMACS can generally be grouped into three major categories: Air Traffic Services (ATS ), Airline Operational Control (AOC) Services and Airport Authority Services (see Figure 1). Within these broad categories, the data communications and applications can be described as either fixed or mobile, based on the mobility of the end user. Figure 1: Examples of AeroMACS Applications 2.1.1.3 The application that a user will be connected to vary depending on the usage. The AAA services within the CSN network will authorize the users’ SS based on certificate established within the AAA. For instance aircraft, which are mobile assets, are expected to have connectivity to both Air Traffic Services group of applications as well as Airline Operational Control group of applications and may have connection to Airport Authority group of applications such as Aircraft de-icing. Airport Sensor systems, which are generally fixed assets, are expected to connect an Airport Authority type of application such as Security Video. Nomadic and non-aircraft Mobile system may have connections to all three of the above cited groups of applications depending on their needs and authorizations. Determination of the type of user SS is critical to providing the correct level of service over AeroMACS. Figure 2 AeroMACS Generic Applications and Communications overview 2.1.2 Services 2.1.2.1 The services that are described in the following scenarios could be handled by AeroMACS. 2.1.2.2 Air Traffic Services 2.1.2.2.1 Air traffic services are provided to regulate air traffic to ensure safe conduct of flight operations. Air traffic services can be grouped under 8 major categories: Data Communication Management Services ( DCM) Clearance/Instruction Services (CIS) Flight Information services (FIS) Advisory Services ( AVS) Flight Position/Intent Preference Services (FPS) Emergency Information Services (EIS) Delegated Separation Services (DSS) Miscellaneous Services (MIS)
2.8.1.3.5 The PHS are to be applied consistently at both SS and BS sides. Hence, this requires PHS information to be exchanged between BS and SS for the service flows. The diagram below shows the signalling for PHS information exchange. Figure CS -4 PHS Signalling 2.8.1.3.6 The signalling can happen at the time of service flow creation or subsequently in Dynamic Service Change (DSC) messages. 2.8.1.4 Ethernet Specific Part 2.8.1.4.1 In this configuration Ethernet is supported as the higher layer for AeroMACS. Ethernet packets are received at the CS SAP interface, which are then classified as per the classification rules, header suppression applied if PHS rules are defined and scheduled for transmission as per the QoS policies defined for the service flow. Classification shall be based on Ethernet Header information, IP Header Information in case of IP over Ethernet and/or VLAN Header information. 2.8.1.4.2 Robust Header Compression (ROHC) also be applied in addition to PHS to compress IP Header Portions in addition to Ethernet Header compression. ROHC operations shall be performed in accordance with RFC 3095, RFC3759, RFC 3243, RFC 4995, RFC 3843, RFC 4996. The figure below shows a typical AeroMACS configuration for Layer2 operations. Figure – CS 5 Ethernet CS 2.8.1.4.3 In this configuration BS and SS act as layer 2 devices forwarding the Ethernet packets to the other side. GRE tunnels are established between BS and ASN Gateway to extend the AeroMACS connections established between SS and BS. In this configuration SS does not perform any functions related Layer 3 (IP) related functions such as DHCP negotiations or IP address configurations. Such functionalities are to be handled by the aircraft edge router connected to SS. Basically, IP link is established between aircraft router and ASN gateway. 2.8.1.5 IP Specific Part 2.8.1.5.1 In this configuration IP packets are directly carried over AeroMACS link. Classification is based on IP Header Information. ROHC can also be used instead of PHS. The figure below shows IP CS configuration. Figure – CS 6 IP CS
fcNstart and fcNstop. Table 1. AeroMACS Channel Set Definition. Band Class Group Channel BW (MHz) Frequency (MHz) RF Channel Center Frequency Number Set Uplink Downlink Uplink Downlink 10.A 5 5000-5150 5000-5150 (100050, 102950, 5) (100050, 102950, 5) 2.6.1.3 The AeroMACS center frequency step size is 250 KHz consistent with WiMAX Forum® Air Interface Release 1.0. Standard AeroMACS RF channels are every 250 KHz from a channel center frequency of 5002.5 MHz to 5147.5 MHz. 2.10.2 AeroMACS Band Class Group 2.10.2.1 WiMAX Forum® Mobile Radio specifications for Mobile Stations and Base Stations for AeroMACS are listed in Table 2. Table 2. AeroMACS Band Class Group and Primary Characteristics Band Group Uplink MS Transmit Frequency (MHz) Downlink MS Receive Frequency (MHz) Channel BW (MHz) Duplex Mode WiMAX Forum® Air Interface Release 10.A 5 TDD 1.0 2.10.3 Preferred Channel Center Frequencies for AeroMACS 2.10.3.1 The RF channel center frequencies of Table 3 represent preferred channels for AeroMACS. These channels are expected to be used unless channel planning for an airport needs to use other possible channels due to interference from other system. Compliance to this list is not sufficient for conformance. The RF channel center frequencies listed in Table 2 are the basis for interoperability and conformance purposes. Table 3. AeroMACS Preferred Channel Set Definition. Band Class Group Channel BW (MHz) Frequency Range (MHz) RF Channel Center Frequency Number Set Uplink Downlink Uplink Downlink 10.A 5 (100100, 102900, 100) (100100, 102900, 100) Preferred AeroMACS RF channels consist of 11 channels separated by 5 MHz with a channel center frequency from 5005 MHz to 5145 MHz. 2.10.4 AeroMACS communication entities use 2 types of bands:
Table 3. AeroMACS Preferred Channel Set Definition. Band Class Group Channel BW (MHz) Frequency Range (MHz) RF Channel Center Frequency Number Set Uplink Downlink Uplink Downlink 10.A 5 (100100, 102900, 100) (100100, 102900, 100) 3.8.3.2 Preferred AeroMACS RF channels are 5 MHz from a channel center frequency of 5005 MHz to 5145 MHz. — END —