RACH-ConfigTwoTA (RACH-ConfigTwoTA-r18)
RACH-ConfigTwoTA-r18 is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
The IE RACH-ConfigTwoTA is used to specify random access parameters for each additional PCI configured for the serving cell.
RACH-ConfigTwoTA-r18 ::= SEQUENCE {
additionalPCI-andRACH-Index-r18 AdditionalPCIIndex-r17,
rach-ConfigGeneric-r18 RACH-ConfigGeneric,
ssb-perRACH-Occasion-r18 ENUMERATED {oneEighth, oneFourth, oneHalf, one, two, four, eight, sixteen} OPTIONAL, -- Need M
prach-RootSequenceIndex-r18 CHOICE {
l839 INTEGER (0..837),
l139 INTEGER (0..137),
l571 INTEGER (0..569),
l1151 INTEGER (0..1149)
},
msg1-SubcarrierSpacing-r18 SubcarrierSpacing OPTIONAL, -- Cond L139
...,
[[
twoTA-restrictedSetConfig-r18 ENUMERATED {unrestrictedSet, restrictedSetTypeA, restrictedSetTypeB} OPTIONAL -- Need R
]]
}Candidate change requests of v18.6.0
The CRs whose title or cover names this change, strong and likely matches only.
- CR 5291 r1 (strong): Corrections on simultaneousU-TCI-UpdateListx and RACH-ConfigTwoTA
Fields (10)
| Field | Description |
|---|---|
| additionalPCI-andRACH-Index-r18 AdditionalPCIIndex-r17 since v18.2.0 | Indicates the associated PCI to this random access configuration. |
| rach-ConfigGeneric-r18 RACH-ConfigGeneric | RACH parameters for contention free random access occasions for CFRA. |
| ssb-perRACH-Occasion-r18 ENUMERATED {oneEighth, oneFourth, oneHalf, one, two, four, eight, sixteen} · OPTIONAL Need M | Number of SSBs per RACH occasion. |
| prach-RootSequenceIndex-r18 CHOICE { | PRACH root sequence index (see TS 38.211 [16], clause 6.3.3.1). The value range depends on whether L=839, L=139, L=571 or L=1151. For FR2-2, only the following values are applicable depending on the used subcarrier spacing: 120 kHz: L=139, L=571, and L=1151 480 kHz: L=139, and L=571 960 kHz: L=139 |
| l839 INTEGER (0..837) | |
| l139 INTEGER (0..137) | |
| l571 INTEGER (0..569) since v18.2.0 | |
| l1151 INTEGER (0..1149) since v18.2.0 | |
| msg1-SubcarrierSpacing-r18 SubcarrierSpacing · OPTIONAL Cond L139 | Subcarrier spacing of PRACH when prach-RootSequenceIndex has value set to l139 (see TS 38.211 [16], clause 5.3.2). Only the following values are applicable depending on the used frequency: FR1: 15 or 30 kHz FR2-1: 60 or 120 kHz FR2-2: 120, 480, or 960 kHz. If absent, the UE applies the SCS as derived from the prach-ConfigurationIndex in RACH-ConfigGeneric (see tables Table 6.3.3.1-1, Table 6.3.3.1-2, Table 6.3.3.2-2 and Table 6.3.3.2-3, TS 38.211 [16]). |
| twoTA-restrictedSetConfig-r18 ENUMERATED {unrestrictedSet, restrictedSetTypeA, restrictedSetTypeB} · OPTIONAL Need R since v18.6.0 | Configuration of an unrestricted set or one of two types of restricted sets associated with additional PCI, see TS 38.211 [16], clause 6.3.3.1. |