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What is the difference between sending dedicated preamble & common preamble in RRCconectionreconfiguration?

+2 votes
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What is the difference between sending dedicated preamble & common preamble in RRCconectionreconfiguration?
posted Jun 30, 2015 by anonymous

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1 Answer

+1 vote

When allocating a dedicated preamble for the random access, E-UTRAN ensures it is available from the first RACH occasion the UE may use. So in short network allocates a reserved preamble to the UE thus drastically reducing the possibility of collisions with other UEs and sharply reducing the access delay.

Now with above definition we can deduce what the common preamble is i.e. the collision can occur hence the access delay.

answer Jun 30, 2015 by Salil Agrawal
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as-Config AS-Config OPTIONAL, -- Cond HO
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nonCriticalExtension HandoverPreparationInformation-v920-IEs OPTIONAL
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AS-Context ::= SEQUENCE {
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ReestablishmentInfo ::= SEQUENCE {
sourcePhysCellId PhysCellId,
targetCellShortMAC-I ShortMAC-I,
additionalReestabInfoList AdditionalReestabInfoList OPTIONAL,
...
}

AdditionalReestabInfoList ::= SEQUENCE ( SIZE (1..maxReestabInfo) ) OF AdditionalReestabInfo

AdditionalReestabInfo ::= SEQUENCE{
cellIdentity CellIdentity,
key-eNodeB-Star Key-eNodeB-Star,
shortMAC-I ShortMAC-I
}

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