1、 JOINT STANDARD J-STD-101.a SUPPLEMENT A TO J-STD-101, JOINT ATIS/TIA CMAS ALERT GATEWAY TO CMSP GATEWAY INTERFACE SPECIFICATION ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, en
2、tertainment and communications industry. More than 300 companies actively formulate standards in ATIS 20 Committees, covering issues including: IPTV, Service Oriented Networks, Home Networking, Energy Efficiency, IP-Based and Wireless Technologies, Quality of Service, Billing and Operational Support
3、. In addition, numerous Incubators, Focus and Exploratory Groups address emerging industry priorities including “Green”, IP Downloadable Security, Next Generation Carrier Interconnect, IPv6 and Convergence. ATIS is the North American Organizational Partner for the 3rd Generation Partnership Project
4、(3GPP), a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications Sectors, and a member of the Inter-American Telecommunication Commission (CITEL). The Telecommunications Industry Association (TIA) is the leading trade association representin
5、g the global information and communications technology (ICT) industries through standards development, government affairs, business opportunities, market intelligence, certification and world-wide environmental regulatory compliance. With support from its 600 members, TIA enhances the business envir
6、onment for companies involved in telecommunications, broadband, mobile wireless, information technology, networks, cable, satellite, unified communications, emergency communications and the greening of technology. TIA is accredited by ANSI. Notice of Disclaimer the C-OTA DTV DTV Receiver and Decoder
7、 picks up and decodes the transmission, and sends CMAC messages to the CMSP Gateway over the Reference Point “C1” Interface. F.1 Background The FCCs Second Report and Order for the Commercial Mobile Alert System Ref 22 developed rules to be in compliance with section 602(c) of the WARN Act Ref 20, t
8、hat require non-commercial educational (NCE) and public broadcast television station licensees and permittees “to install necessary equipment and technologies on, or as part of, any broadcast television digital signal transmitter to enable the distribution of geographically targeted alerts by commer
9、cial mobile service providers that have elected to transmit emergency alerts. Such equipment and technologies must have the capability of allowing licensees and permittees of NCE and public broadcast television stations to receive CMAS alerts from the Alert Gateway over an alternate, secure interfac
10、e and then to transmit such CMAS alerts to CMS Provider Gateways of participating CMS providers.” The FCC Rules developed as a result of the Second Report and Order are contained in the Code of Federal Regulations (CFR), Title 47 Telecommunications, Part 10 Commercial Mobile Alert system, Subpart C
11、System Architecture, Section 10.340, Digital television transmission towers retransmission capability: Licensees and permittees of noncommercial educational broadcast television stations (NCE) or public broadcast television stations (to the extent such stations fall within the scope of those terms a
12、s defined in section 397(6) of the Communications Act of 1934 (47 U.S.C. 397(6) are required to install on, or as part of, any broadcast television digital signal transmitter, equipment to enable the distribution of geographically targeted alerts by commercial mobile J-STD-101.a 3 service providers
13、that have elected to transmit CMAS alerts. Such equipment and technologies must have the capability of allowing licensees and permittees of NCE and public broadcast television stations to receive CMAS alerts from the Alert Gateway over an alternate, secure interface and then to transmit such CMAS al
14、erts to CMS Provider Gateways of participating CMS providers. This equipment must be installed no later than eighteen months from the date of receipt of funding permitted under section 606(b) of the WARN Act or 18 months from the effective date of these rules, whichever is later. The FCC rules do no
15、t require a participating CMSP to support receiving alerts via digital television transmitters. The National Telecommunications and Information Administration (NTIA) issued PBS a grant to install the necessary equipment and technologies on, or as part of, any broadcast television digital signal tran
16、smitter to enable the distribution of geographically targeted alerts by commercial mobile service providers that have elected to transmit emergency alerts. PBS manages the national public television interconnection system of non-commercial television stations that will support the WARN Act requireme
17、nts. F.2 Scope The scope of this Annex is the definition of the interface between the C-OTA DTV DTV Receiver and Decoder and the CMSP Gateway as shown in the Figure 20. The definitions of the other interfaces shown in Figure 20 are outside the scope of this Annex. Figure 20: Public Broadcasting Serv
18、ice CMAS Architecture The Federal Alert Gateway sends CMAC messages to the PBS CMAS Gateway via the “C” Interface. The CMAC messages are inserted in the PBS transport stream transmitted via satellite to terrestrial DTV transmission sites. The CMAC messages are in the DTV signal broadcast from the DT
19、V Transmission Sites using the C-OTA interface. J-STD-101.a 4 The C-OTA DTV Receiver and Decoder picks up the DTV signal and “extracts” the CMAC messages targeted for the CMSP Gateway. The CMAC messages are sent to the CMSP Gateway over the Reference Point “C1” Interface. NOTE: The CMSP Gateway does
20、 not send any CMAC messages to the C-OTA DTV Receiver and Decoder. NOTE: The CMAC messages received from the C-OTA DTV Receiver and Decoder are within the security domain of the CMSP. The security services for transporting the messages within the CMSPs network are determined by the CMSP. When the Re
21、ference Point “C1” Interface is in use, the CMSP Gateway shall not initiate messages toward the Federal Alert Gateway. The CMSP Gateway shall not send a response to messages received from the Federal Alert Gateway on the Reference Point “C1” Interface (e.g., the CMSP Gateway shall not send an acknow
22、ledgement or error response to a message received from the Federal Alert Gateway on the Reference Point “C1” Interface). Any processing in the Federal Alert Gateway, the PBS CMAS Gateway, the PBS Satellite Transmission network, the C-OTA DTV Receiver and Decoder, and the CMSP Gateway that is not rel
23、ated to the Reference Point “C1” is outside the scope of this Annex. F.3 Reference Point “C1” Related Requirements In general, it should be assumed that all requirements in the main body of this Standard apply to the Federal Alert Gateway and the CMSP Gateway for the Reference Point “C1” interface,
24、taking into account the Reference Point “C1” interface supports a subset of the CMAC messages. The following are Reference Point “C1” related requirements: 1. The Federal Alert Gateway shall provide CMAC messages to the PBS CMAS Gateway over the ”C” Interface. 2. The Federal Alert Gateway shall send
25、 all CMAC messages to the PBS CMAS Gateway. The Federal Alert Gateway shall not perform geo-location filtering of CMAC messages to the PBS CMAS Gateway. 3. From the perspective of the “C” Interface, the PBS CMAS Gateway shall support the requirements of the CMSP Gateway as defined in this Standard.
26、4. The PBS CMAS Gateway shall not embed CMAC messages that failed validation onto a DTV broadcast signal. 5. A DTV Transmission Site shall embed CMAC messages onto a DTV broadcast signal using the DTV Terrestrial Over-the-Air Protocol. The process of embedding CMAC messages onto the DTV Terrestrial
27、Over-the-Air Protocol is performed in PBSs network prior to broadcasting. 6. The DTV Transmission Site shall only embed CMAC messages onto the DTV Terrestrial Over-the-Air Protocol that were received via the PBS CMAS Gateway, and originated from the Federal Alert Gateway and sent over the Federal Al
28、ert Gateway to PBS CMAS Gateway Interface. 7. Geo-targeted CMAC messages received at the C-OTA DTV Receiver and Decoder shall be identical to the CMAC message received at the PBS CMAS gateway. NOTE: A CMSP Gateway covering a wide geographic area may be deployed anywhere in the nation; thus, the CMAC
29、 messages delivered to the PBS CMAS gateway and received by the C-OTA DTV Receiver and Decoder contains all alert information, including the geotargeting information, provided by the Federal Alert Gateway which the CMSP Gateway will use to transmit the alerts. To support this CMSP architecture, all
30、DTV Transmission Sites nationwide will broadcast the same identical CMAC message. Any other J-STD-101.a 5 transmission of geotargeted CMAMs by the PBS CMAS Gateway, PBS Satellite Transmission, DTV Transmission Site, or the C-OTA DTV Receiver and Decoder is beyond the scope of this Standard. 8. C-OTA
31、 DTV Receiver and Decoder shall send each unique CMAS message across the “C1” Interface only once. 9. A CMSP that optionally chooses to receive CMAC messages via the DTV Terrestrial Over-the-Air Protocol requires a C-OTA DTV Receiver and Decoder to receive the DTV over-the-air signal and to extract
32、the CMAC messages targeted for the CMSP Gateway from the DTV Terrestrial Over-the-Air Protocol. The extraction of the CMAC message from the DTV Terrestrial Over-the-Air Protocol, as well as function of the C-OTA DTV Receiver and Decoder beyond the “C1” Interface protocol is specified in PBS PWS-005.
33、110. “C1” interface shall be in the domain of the CMSP and the security of the “C1” interface shall be contained within the security domain of the CMSP. 11. CMSP Gateway support for the “C1” interface shall be optional. 12. A CMSP Gateway which supports the optional “C1” interface shall have the cap
34、ability to be configured to receive CMAC messages either from the Federal Alert Gateway via the “C” Interface, or from the C-OTA DTV Receiver and Decoder via the “C1” interface. There is no requirement for simultaneous reception of CMAC messages over both the “C” interface and the “C1” interface. 13
35、. The Reference Point “C1” interface shall not include provisions for the following functions: a. Acknowledgements. b. CAP Retrieval. c. Transmission Control Procedure. 14. The C-OTA DTV Receiver and Decoder shall send all the CMAC messages that it receives to the CMSP Gateway. The following list id
36、entifies type of the CMAC messages: a. Alert (clause 7.5.1, Alert Message). b. Update (clause 7.5.2, Update Message). c. Cancel (clause 7.5.3, Cancel Message). d. RMT (clause 7.5.7, RMT Message). e. Link Test (clause 7.5.6, Link Test Message) 15. Transmission Control Protocol (TCP) Ref 23 shall be t
37、he transport protocol used to transmit XML Alert Messages between the C-OTA DTV Receiver and Decoder and the CMSP Gateway on the Reference Point “C1” interface. a. Transmission Control Protocol (TCP) shall be implemented for the transport layer in accordance with RFC 793 Ref 23. TCP connections shal
38、l be persistent. 16. IP shall be the network layer protocol used by the C-OTA DTV Receiver and Decoder and the CMSP Gateway to exchange CMAC messages. Both IP Version 4 (IPv4) and IP Version 6 (IPv6) shall be supported. a. The Reference Point “C1” interface shall support IP Version 4 for the network
39、 layer in accordance with IETF STD 5 (RFC 791) Ref 28. b. The Reference Point “C1” interface shall support IP Version 6 for the network layer in accordance with RFC 2460 Ref 30, RFC 2464 Ref 31, RFC 4291 Ref 32, and RFC 4443 Ref 33. 1A copy of the PBS PWS-005, OTA Receiver & Decoder, version 1.1, sp
40、ecification can be obtained by sending an email message to . J-STD-101.a 6 c. The network layer shall support Internet Control Message Protocol (ICMP) in accordance with IETF STD 5 (RFC 792) for IP Version 4 Ref 29. 17. HTTP shall be the application level protocol used by the C-OTA DTV Receiver and
41、Decoder and the CMSP Gateway to exchange CMAC messages. The HTTP is a request/response protocol. The HTTP methods shall be limited to POST for the Reference Point “C1” interface. The HTTP POST method shall be used by the C-OTA DTV Receiver and Decoder (client) to send all messages in the CMAC protoc
42、ol to the CMSP Gateway (server). a. HTTP communications shall be per RFC 2616 Ref 1. b. HTTP communications carrying CMAC messages shall be to port TCP 8080. c. HTTP methods shall be limited to POST when CMAC Alert, Update, Cancel, and RMT are sent over HTTP. d. The HTTP POST method shall use “*” as
43、 the Request_URI. 18. The Reference Point “C1” interface shall use the reliable TCP protocol to correct any transmission errors that occur at IP or lower layers per Section 7.7.1 and Section 7.7.2. 19. The CMSP Gateway shall perform CMAC Error Handling per Section 7.7.3.1 and 7.7.3.2 with the except
44、ion of sending an error message for the following message types: a. Alert (clause 7.5.1, Alert Message). b. Update (clause 7.5.2, Update Message). c. Cancel (clause 7.5.3, Cancel Message). d. RMT (clause 7.5.7, RMT Message). e. Link Test (clause 7.5.6, Link Test Message). 20. A CMSP Gateway that rec
45、eives a CMAC message over the Reference Point “C1” Interface that fails validation shall not broadcast the CMAC message and shall discard the CMAC message. 21. The CMSP Gateway shall keep a log of all messages received over the Reference Point “C1” interface, including messages that fail validation
46、and are discarded. 22. Reference Point “C1” Interface shall support Non-Repudiation per Section 5.5.3. The Federal Alert Gateway shall digitally sign each CMAC Alert, Update, Cancel, and RMT message. This Digital Signature shall be included in the CMAC message on the Reference Point “C1” interface.
47、The CMSP Gateway may optionally use the digital signature for non-repudiation or ignore it, but it must be able to process the CMAC with the digital signature. F.4 Reference Point “C1” Call Flows F.4.1 Reference Point “C1” Valid Message Call Flow The CMAC Alert, Update, Cancel, RMT, and Link Test me
48、ssage types have the same call flow across the Reference Point “C1” Interface. The following figure with its descriptions of the associated call flow steps defines the call flow for CMAC Alert, Update, Cancel, RMT, and Link Test message types: J-STD-101.a 7 Figure 21: Reference Point “C1” Valid Mess
49、age Call Flow 1. A CMAC Alert, Update, Cancel, RMT, or Link Test message is received by the C-OTA DTV Receiver and Decoder from the DTV Terrestrial Over-the-Air Protocol. This function is beyond the scope of this Standard. 2. The C-OTA DTV Receiver and Decoder sends the CMAC Alert, Update, Cancel, RMT, or Link Test message to the CMSP Gateway via the Reference Point “C1” Interface. 3. The CMSP Gateway attempts to validate the received CMAC message and the received CMAC message passes validation. 4. The processing of the received CMAC Alert, Update, Ca
