Technical Provisions for Mode S Services and Extended Squitter

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DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris A-110 Technical Provisions for Mode S Services and Extended Squitter A.4.3 DOWNLINK BROADCAST IDENTIFIER The following sections are numbered A.4.3.X, where “X” is the decimal equivalent of the downlink broadcast identifier number. This is done to allow definitions of the hitherto undefined formats to be inserted without affecting the paragraph numbering. This identifier has not been assigned. A.4.3.2.1 INTRODUCTION A.4.3.1 DOWNLINK BROADCAST IDENTIFIER 0116 A.4.3.2 DOWNLINK BROADCAST IDENTIFIER 0216 : TRAFFIC INFORMATION SERVICE The traffic information service shall be provided by uplinking information on proximate aircraft that may be of interest to own-aircraft by a Mode S interrogator on uplink MSP channel 2. Note.— The service and uplink messages are specified in §A.3.2.2 under “Uplink MSP Channel 2”. It shall be possible for the aircraft to request to be either connected to or disconnected from the TIS service. These requests shall be made using the Mode S broadcast protocol using broadcast identifier 0216. These requests shall be the only downlink messages used by the TIS. A.4.3.2.2 TIS DOWNLINK MESSAGES The TIS airborne data link service shall be able to generate two types of Mode S downlink messages: a) TIS service connect request (TSCR); and b) TIS service disconnect request (TSDR). Draft Both the TSCR and the TSDR shall be sent as Comm-B broadcast messages using the broadcast identifier 0216. Note.— The use of the Mode S Comm-B broadcast protocol deals with the case of multiple Mode S interrogators with overlapping coverage, which are in contact with a given TIS aircraft at the same time. The format of a TIS downlink message (either TSCR or TSDR) shall be as specified below: Header DIN 1 DIN 2 DIN 3 DIN 4 DIN 5 DIN 6 8 bits 8 bits 8 bits 8 bits 8 bits 8 bits 8 bits The message header shall be the standard message header for TIS described in uplink MSP channel 2 (see §A.3.2.2). The 8-bit data link service identifier numbers (DIN) shall be read and processed sequentially from the TCSR or TSDR message until either: a) DIN i = 0; or b) all bits of the downlink message have been processed. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
Appendix A A-111 Note 1.— This structure and protocol for MSP downlink service requests allow for future expansion and use by other MSP data link services. Note 2.— The principal and alternate TIS II codes in the TIS process (see §A.3.2.2) are set to the “none” state when either a TSCR or TSDR is generated. A.4.3.2.2.1 TCSR format This TIS Comm-B downlink message shall be generated when the pilot requests the initiation of TIS service. The TSCR message shall be generated at the same time as the MSP capability report bit for TIS is set to “ONE”. A TSCR shall be identified by a DIN value of 1. The TSCR shall be defined as a Comm-B broadcast message so that any Mode S ground interrogator capable of supporting TIS can respond to it. A.4.3.2.2.2 TSDR format This TIS Comm-B broadcast downlink message shall be generated when the pilot requests termination of TIS service. The TSDR message shall be generated at the same time as the MSP capability report bit for TIS is set to “ZERO”. A TSDR shall be identified by a DIN value of 2. The TSDR shall be defined as a Comm-B broadcast message so that any Mode S interrogator supporting TIS can respond to it. These identifiers have not been assigned. See Table A-2-16. These identifiers have not been assigned. See Table A-2-32. DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris These identifiers have not been assigned. (Reserved for update request) A.4.3.3 TO A.4.3.15 DOWNLINK BROADCAST IDENTIFIERS 0316 TO 0F16 A.4.3.16 DOWNLINK BROADCAST IDENTIFIER 1016 : DATA LINK CAPABILITY REPORT See Annex 10, Volume III, Part I, Chapter 5. Draft A.4.3.17 TO A.4.3.31 DOWNLINK BROADCAST IDENTIFIERS 1116 TO 1F16 A.4.3.32 DOWNLINK BROADCAST IDENTIFIER 2016 : AIRCRAFT IDENTIFICATION A.4.3.33 TO A.4.3.253 DOWNLINK BROADCAST IDENTIFIERS 2116 TO FD16 A.4.3.254 DOWNLINK BROADCAST IDENTIFIER FE16 DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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Technical Provisions for Mode S Services and Extended Squitter

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