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SAE J2735-Draft-Rev18 [issued: 06-26-07]
-
175 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
9.6 Data Element: DE_Wave Received Signal Strength
Use: The one byte value of signal strength collected by the lower levels of the wave protocol as per the
definition found in IEEE 16909.4 clause 7.5 "WAVE Receiver Signal Strength (WRSS) polling" and as
defined in the ASN.1 of that standard. This value can be collected from the lower layers and sent back in
the message of this standard. Keep in mind that this is also being sent by the lower layers when solicited
by suitable message traffic as well.
ASN.1 Representation:
WaveReceivedSignalStrength ::= INTEGER (0..255) -- as per IEEE 1609.4 use
XML Representation:
<xs:simpleType name="WaveReceivedSignalStrength" >
<xs:annotation>
<xs:documentation>
as per IEEE 1609.4 use
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:unsignedByte"/>
</xs:simpleType>
Remarks: Taken at a defined snapshot event to define RSU coverage patterns such as the moment an OBU
joins or becomes associated with an RSU and can send probe data.
9.7 Data Frame: DF_Application Context Mark
Use: The Application Context Mark (ACM) provides a unique means of identifying each element of each
specific application. A priority is assigned to each ACM, allowing a single application to utilize different
priorities for different elements.
ASN.1 Representation:
AppContextMark ::= SEQUENCE SEQUENCE {
said SpecificApplicationIdentification, -- SAID
context Context, -- see appropriate Appendix
priority Priority -- in accordance with IEEE P1609
...
}
XML Representation:
<xs:complexType name="AppContextMark" >
<xs:sequence>
</xs:sequence>
</xs:complexType>
Used by: This entry is used directly by one other data structure in this standard, a DF called DF_ValueList
9.8 Data Frame: DF_DDate
Use: The DSRC style date is a compound value consisting of finite-length sequences of integers (not
characters) of the form: "yyyy, mm, dd" - as defined below. Because the length of each element is known,
no inner element tagging is normally used in transmission. Thus, this data frame occupies 4 bytes in total.
ASN.1 Representation:
DDate ::= SEQUENCE SEQUENCE {
year DYear, -- 2 bytes
month DMonth, -- 1 byte
day DDay, -- 1 byte
}
XML Representation:
<xs:complexType name="DDate" >
<xs:sequence>
</xs:sequence>