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MSG_SignalRequestMessage
The signal request message (SRM) is a message sent by a V2X-equipped entity (such as a vehicle) to the RSU in a signalized intersection. It is used for either a priority signal request or a preemption signal request depending on the way each request is set. Each request defines a path through the intersection which is desired in terms of lanes and approaches to be used. Each request can also contain the time of arrival and the expected duration of the service. Multiple requests to multiple intersections are supported. The requestor identifies itself in various ways (using methods supported by the RequestorDescription data frame), and its current speed, heading, and location can be placed in this structure as well. The specific request for service is typically based on previously decoding and examining the list of lanes and approaches for that intersection (sent in MAP messages). The outcome of all of the pending requests to a signal can be found in the signal status message (SSM) and may be reflected in the SPAT message contents if successful.
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전체 화면 뷰어에서 메시지 → 필드 → 데이터 프레임·데이터 엘리먼트·미등록 타입 → 하위 구조 전체를 펼쳐 보고, 이름으로 검색해 해당 위치로 바로 이동할 수 있습니다.
ASN.1
SignalRequestMessage ::= SEQUENCE {
timeStamp MinuteOfTheYear OPTIONAL,
second DSecond,
sequenceNumber MsgCount OPTIONAL,
requests SignalRequestList OPTIONAL,
-- Request Data for one or more signalized
-- intersections that support SRM dialogs
requestor RequestorDescription,
-- Requesting Device and other User Data
-- contains vehicle ID (if from a vehicle)
-- as well as type data and current position
-- and may contain additional transit data
regional SEQUENCE (SIZE(1..4)) OF
RegionalExtension {{Reg-SignalRequestMessage}} OPTIONAL,
...
}
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노드 클릭 = 선택
그룹 더블클릭 = 항목 전부 펼치기(다시 더블클릭 = 접기)
메시지·데이터 프레임·데이터 엘리먼트 그룹은 정보 주제 카드로 먼저 갈라짐 — 주제 더블클릭 = 항목 펼치기
전체 항목은 우측 패널 목록 — 항목 클릭 = 그림에 펼치기
범례 클릭 = 타입 필터
드래그 = 자리 옮기기