SIB9
SIB9 is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
SIB9 contains information related to GPS time and Coordinated Universal Time (UTC). The UE may use the parameters provided in this system information block to obtain the UTC, the GPS and the local time.
SIB9 ::= SEQUENCE {
timeInfo SEQUENCE {
timeInfoUTC INTEGER (0..549755813887),
dayLightSavingTime BIT STRING (SIZE (2)) OPTIONAL, -- Need R
leapSeconds INTEGER (-127..128) OPTIONAL, -- Need R
localTimeOffset INTEGER (-63..64) OPTIONAL -- Need R
} OPTIONAL, -- Need R
lateNonCriticalExtension OCTET STRING OPTIONAL,
...,
[[
referenceTimeInfo-r16 ReferenceTimeInfo-r16 OPTIONAL -- Need R
]],
[[
eventID-TSS-r18 INTEGER (0..63) OPTIONAL -- Need R
]]
}Candidate change requests of v18.0.0
The CRs whose title or cover names this change, strong and likely matches only.
- CR 4258 r3 (strong): Introduction of URLLC and Timing Resiliency
Fields (8)
| Field | Description |
|---|---|
| timeInfo SEQUENCE { · OPTIONAL Need R | |
| timeInfoUTC INTEGER (0..549755813887) | Coordinated Universal Time corresponding to the SFN boundary at or immediately after the ending boundary of the SI-window in which SIB9 is transmitted. In an NTN cell, the indicated time is referenced at the uplink time synchronization reference point (RP), i.e., UE should take into account the propagation delay between UE and RP when determining the UTC time at the UE. The field counts the number of UTC seconds in 10 ms units since 00:00:00 on Gregorian calendar date 1 January, 1900 (midnight between Sunday, December 31, 1899 and Monday, January 1, 1900). See NOTE 1. This field is excluded when determining changes in system information, i.e. changes of timeInfoUTC should neither result in system information change notifications nor in a modification of valueTag in SIB1 . |
| dayLightSavingTime BIT STRING (SIZE (2)) · OPTIONAL Need R | Indicates if and how daylight-saving time (DST) is applied to obtain the local time. The semantics are the same as the semantics of the Daylight Saving Time IE in TS 24.501 [23] and TS 24.008 [38]. The first/leftmost bit of the bit string contains the b2 of octet 3 and the second bit of the bit string contains b1 of octet 3 in the value part of the Daylight Saving Time IE in TS 24.008 [38]. |
| leapSeconds INTEGER (-127..128) · OPTIONAL Need R | Number of leap seconds offset between GPS Time and UTC. UTC and GPS time are related i.e. GPS time -leapSeconds = UTC time. |
| localTimeOffset INTEGER (-63..64) · OPTIONAL Need R | Offset between UTC and local time in units of 15 minutes. Actual value = field value 15 minutes. Local time of the day is calculated as UTC time + localTimeOffset. |
| lateNonCriticalExtension OCTET STRING · OPTIONAL | |
| referenceTimeInfo-r16 ReferenceTimeInfo-r16 · OPTIONAL Need R since v16.0.0 | |
| eventID-TSS-r18 INTEGER (0..63) · OPTIONAL Need R since v18.0.0 | This field indicates the status of the 5G access stratum time distribution parameter Clock Quality Reporting Control Information as defined in TS 23.501 [32]. |