Technical Provisions for Mode S Services and Extended Squitter

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A-90 Technical Provisions for Mode S Services and Extended Squitter A.3. FORMATS FOR MODE S SPECIFIC PROTOCOLS (MSP) A.3.1 MSP CHANNEL NUMBER ALLOCATIONS The details of protocols and data transfers shall be as specified in the following paragraphs. Note.— Some MSP channel numbers have been assigned (see Annex 10, Volume III, Part I, Chapter 5, Table 5-25). A.3.2 UPLINK MSP CHANNELS The following sections are numbered §A.3.2.X, where ‘X’ is the decimal equivalent of the uplink MSP channel number. This shall be done to allow definitions of the hitherto undefined formats to be inserted without affecting the paragraph numbers. For MSP packet formats refer to Annex 10, Volume III, Part I, Chapter 5. (Reserved for specific services management) The description of this channel has not yet been developed. A.3.2.2.1 PURPOSE A.3.2.1 UPLINK MSP CHANNEL 1 A.3.2.2 UPLINK MSP CHANNEL 2: TRAFFIC INFORMATION SERVICE (TIS) The TIS shall have the capability to generate automatic alert information on any aircraft that carries an operating transponder (Mode A/C or Mode S). Aircraft that are under primary radar tracking can also be used to generate reports. Draft Note.— The traffic information service (TIS) is intended to improve the safety and efficiency of “see and avoid” flight by providing the pilot with an automatic display of nearby traffic and warnings of any potentially threatening traffic conditions. The TIS is functionally equivalent to ACAS I, providing traffic advisories but no resolution advisory information. By utilizing the surveillance database maintained by Mode S ground interrogators and its data link, the TIS can provide airborne traffic alerting with a minimum airborne equipage requirement. The TIS is provided without any ATC involvement. A.3.2.2.2 TIS UPLINK MESSAGE FORMATS All TIS uplink messages shall be structured as shown below. Each TIS uplink message shall be 56 bits. TIS traffic data messages shall consist of one or more short-form MSP packets. There shall be three types of TIS uplink messages as follows: 1) “Keep-alive” 2) “Goodbye” DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris 3) “Traffic data” DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Appendix A A-91 Header Message type Traffic block 1 Traffic block 2 8 bits 6 bits 21 bits 21 bits Note.— The formats of TIS downlink messages are defined in §A.4 of this appendix under broadcast identifier 0216. A.3.2.2.2.1 Message header The 8-bit header shall be present in all TIS messages. The message header for TIS shall have the value 02 (hexadecimal), since all TIS messages utilize the short-form MSP protocol and TIS is assigned MSP channel 2. A.3.2.2.2.2 Message type The 6-bit message type field shall be used to differentiate the different types of uplink messages: Message type value TIS message uplink type 0 to 59 Traffic data, first segment (own-heading) 60 Traffic data, intermediate segment(s) 61 Traffic data, final segment 62 Goodbye 63 Keep-alive In the case of “first segment” traffic data messages, the 6-bit message type field shall contain the Mode S interrogatorderived tracked own-heading of the aircraft receiving the TIS message. This heading shall be quantized in 6 degree increments and shall be expressed with reference to magnetic north at the interrogator. The own-heading value in traffic data messages shall be provided to permit display heading correction on board the TIS-equipped aircraft by using an airborne heading sensor. Note.— Such a heading correction may be necessary when the aircraft is manoeuvring or crabbing due to wind. Draft Since there may be several TIS traffic data messages to a given aircraft during a given scan, TIS processing shall be able to group the TIS traffic data uplinks together correctly. The “first”, “intermediate”, and “final” segment type values shall provide the necessary information to perform this grouping process. The mechanism for this shall be as specified below. Buffer space for at least 4 TIS traffic data messages (eight aircraft) shall be provided. A.3.2.2.2.2.1 Keep-alive message The TIS keep-alive message shall contain the message header and the message type fields as described above. The message type field shall be set to 63 decimal. The remaining bits of the message shall be unused. A.3.2.2.2.2.2 Goodbye message The TIS goodbye message shall contain the message header and the message type fields as described above. The message type field shall be set to 62 decimal. The remaining bits of the message shall be unused. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Msg Bit # “ME” Bit # Appendix C
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