BS EN 15531-1:2015 - Public transport. Service interface for real-time information relating to public transport operations. Context and framework

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BS EN 15531-1:2015

Public transport. Service interface for real-time information relating to public transport operations. Context and framework

Status : Current   Published : August 2015



1.1 Interfaces specified by this standard 1.1.1 Business context Real-time information may be exchanged between a number of different organizations, or between different systems belonging to the same organization. Key interfaces include the following: - Between public transport vehicle control centres – generally, for fleet and network management. - Between a control centre and an information provision system – generally, to provide operational information for presentation to the public. - Between information provision systems – generally, sharing information to ensure that publicly available information is complete and comprehensive. - Between information provision systems – and data aggregation systems that collect and integrate data from many different sources and different types of data supplier and then distribute it onwards. - Between information provision systems and passenger information devices such as mobile phones, web browsers, etc. Annex B describes the business context for SIRI in more detail. SIRI is intended for wide scale, distributed deployment by a wide variety of installations. In such circumstances it is often not practical to upgrade all the systems at the same time. SIRI therefore includes a formal versioning system that allows for the concurrent operation of different levels at the same time and a disciplined upgrade process. In this general framework, SIRI defines a specific set of concrete functional services. The services separate the communication protocols from the message content (‘functional services’). This allows the same functional content to be exchanged using different transport mechanisms, and different patterns of exchange. Figure 1 below shows this diagrammatically. 1.1.2 SIRI communications SIRI provides a coherent set of functional services for exchanging data for different aspects of PT operation. A common data model, based on Transmodel 5.1, is used across all services. A communication layer defines common procedures for the requesting and exchanging of data. Within SIRI, the same general communication protocols are used for all the different concrete functional interfaces, and specify a common infrastructure for message referencing, error handling, reset behaviour and so forth. The communications layer is defined in Part 2 of the SIRI document set. To allow the most efficient use to be made of bandwidth and processing capacity, the SIRI communications architecture supports several different patterns of interaction. SIRI supports both request/response and publish/subscribe protocols between servers, allowing applications both to pull or to push data. The SIRI publish/subscribe pattern of interaction follows the paradigm described in the W3C candidate standard ‘Publish-Subscribe Notification for Web Services (WS-PubSub)’. SIRI uses the same separation of concerns, and a similar terminology for Publish/Subscribe concepts as is used in WS-PubSub. For the delivery of data in response to both requests and subscriptions, SIRI supports two common patterns of message exchange as realised in existent national systems: - one-step ‘direct’ delivery: allowing the simple rapid delivery of data; - two-step ‘fetched’ delivery: allowing a more optimised use of limited resources. 1.1.3 SIRI functional services SIRI provides specific protocols for the following functional services, defined in Part 3 of the SIRI document set: - Production Timetable (PT) Service: to send daily information on the operational timetable and associated vehicle running information. - Estimated Timetable (ET) Service: to send real-time information on timetable, including changes based on the production service and on actual running conditions. - Stop Timetable (ST) Service: to provide a stop-centric view of timetabled vehicle arrivals and departures at a designated stop. - Stop Monitoring (SM) Service: to send real-time arrival & departure information relating to a specific stop.

Standard NumberBS EN 15531-1:2015
TitlePublic transport. Service interface for real-time information relating to public transport operations. Context and framework
Publication Date31 August 2015
Cross ReferencesEN 12896, ISO 639-1, ISO 8601, CEN/TS 13149-6, EN 28701, ENV 13998, IETF RFC 2119, ISO/IEC 19501, ISO/IEC 8859-15, ISO/TS 24530, ISO 639, IETF 1766, CEN/TS 16614-1, SAE J1939/71, W3C XML 2004, WGS 1984
ReplacesDD CEN/TS 15531-1:2007
International RelationshipsEN 15531-1:2015
Draft Superseded By13/30285295 DC
DescriptorsPassenger transport, Transportation, Road transport, Rail transport, Railways, Information, Timetables, Information exchange, Messages, Display devices, Interfaces (data processing), Data transmission
Title in FrenchTransport public. Interface de service pour les informations en temps réel relatives aux opérations de transport public. Cadre et contexte
Title in GermanÖffentlicher Verkehr. Serviceschnittstelle für Echtzeitinformationen bezogen auf Operationen im öffentlichen Verkehr. Kontext und Grundstruktur
ISBN978 0 580 83397 7
File Size3.577 MB

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