IEEE Std 1609.12-2019 pdf download
IEEE Std 1609.12-2019 pdf download.IEEE Standard for Wireless Accessin Vehicular Environments (WAVE)一ldentifiers.
Provider Service Identifier (PSID): An identifier of a higher layer service provided by a higher layer entity. service: Spi: higher layer service.
Wireless Access in Vehicular Environments (WVE) Service Advertisement (WSA): A data structure that may include the announcement of the availability of higher layer services. (IEEE Std 1609.3)
Wireless Access in Vehicular Environments (WAVE) Short Message (WSM): A packet consisting of a WSMP header and WSM Data. (IEEE Std 1609.3)
Wireless Access in Vehicular Environments (WAVE) Short Message Protocol (WSMP): The protocol specified in IEEE Std 1609.3 that minimizes communications overhead. (IEEE Std 1609.3)
3.2 Abbreviations and acronyms
ISO International Organization for Standardization
ITS Intelligent Transportation Systems
ITS-AID Intel Ii gent Transportation Systems Application Identifier
PSID Provider Service Identifier
WAVE wireless access in vehicular environments
WSMP WAVE Short Message Protocol
4. Provider Service Identifier (PSID)
4.1 PSID background and use
The PSID is an identifier used in WAVE standards. PSID is specified in this document, and its usage is described in IEEE Std l609.3. As used in WAVE, a PSID is an integer with a value from 0 to 270 549 119 (OxlO-20-40-7F, where ‘0x” indicates hexadecimal, or hex, notation). Each allocated PSID value is associated with an organization that is authorized to describe the use of that PSID.
PSIDs have two uses specified in IEEE Std 1609.3. First, a service provider identifies advertised service opportunities by the PSID values in WAVE Service Advertisement messages that it or another entity may transmit. Second. the WAVE Short Message Protocol (WSMP) delivers WAVE Short Message content to higher layer entities based on the PSID value set by the sender in the message header.5 A third use of the PSID is specified in IEEE Std I 609.2Th1 [RI ].‘ A security certificate lists the PSII) value(s) identifying higher layer services for which a sender is authorized to generate signed, secured protocol data units.
The fixed-length four-octet PSID format and values specified in trial-use IEEE Std 1609.3-2007 [B2] are deprecated, and the registration process described in that document is no longer in effect. None of those values were fielded for other than experimental purposes. The IEEE Registration Authority (IEEE-RA) assignment procedures specified in that standard are inoperative.
The PSID shares certain characteristics and its number space with the ITS application identifier (ITS-AID) used in ISO ITS standards. The specification of the ITS-AID and a high-level functional description of its management and assignment procedures can be found in ISO TS 17419 [B6]. As of 2019, a long-term solution for a common registration service that helps to ensure globally unique assignments of identifier values for the PSID and the ITS-Al[) is foreseen.
The IEEE-RA is responsible for handling PSID allocation requests, and for maintaining an online public listing of allocated PSIDs. The IEEE-RA maintains a website that includes information pertaining to PSIDs including a tutorial, FAQs, application form, and the public Iisting.
Allocated PSID values arc listed on the IEEE-RA website. There arc also testing PSIDs that have been preallocated for use in research and development projects. These can be used by any organization in development of their application, while testing in a controlled environment such as a laboratory or test track. If experimental PSI[)s are utilized in an open or public system, caution should be exercised to avoid conflicts with other experimental PSID users. The list of testing PSIDs can also be found on the IEEE-RA website.
A range of 64 PSID values has been allocated for unregistered use. A set of WAVE devices can use an unregistered PSID to convey a mutually agreed meaning. Both the meaning and the means by which the devices determine the meaning are outside the scope of the WAVE standards. There is no assurance that all devices operating in a given area attach the same meaning to the value.
PSIDs may be allocated for private use. A PSID is considered private if the application specification is not published.
4.2 P-encoding of PSIDs
This standard defines a compact encoding for PSID values referred to as p-encoding. This specification of the p-encoded form of the PSII) is required by IEEE Std 1609.3. Octets are numbered from the left starting at zero (Octet 0). The length of the PSID is indicated by Octet 0, where the position of the first zero-value bit in descending order of bit significance in the octet indicates the length in octets of the p-encoded PSID. Using p-encoding, a binary “0” in the most-significant bit indicates a one-octet PSID; a binary “10” in the two most- significant hits indicates a two-octet PSID: a binary “110” in the three most-significant bits indicates a three- octet PS ID; and a binary “11 10” in the four most-significant bits indicates a four-octet PS ID.
