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Under what different situations does MME trigger OVERLOAD START towards eNodeB?

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Under what different situations does MME trigger OVERLOAD START towards eNodeB?
posted Oct 5, 2015 by Samardeep Acharya

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1 Answer

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As per 36.413 below are causes when MME sends overload start to eNB .

The eNB receiving the OVERLOAD START message shall assume the MME from which it receives the message as
being in an overloaded state.
If the Overload Action IE in the Overload Response IE within the OVERLOAD START message is set to
- “reject RRC connection establishments for non-emergency mobile originated data transfer” (i.e., reject traffic
corresponding to RRC cause “mo-data” and “delayTolerantAccess” in TS 36.331 [16]), or
- “reject RRC connection establishments for signalling” (i.e., reject traffic corresponding to RRC cause “mo-data”,
“mo-signalling” and “delayTolerantAccess” in TS 36.331 [16]), or
- “only permit RRC connection establishments for emergency sessions and mobile terminated services” (i.e., only
permit traffic corresponding to RRC cause “emergency” and “mt-Access” in TS 36.331 [16]), or
- “only permit RRC connection establishments for high priority sessions and mobile terminated services” (i.e.,
only permit traffic corresponding to RRC cause “highPriorityAccess” and “mt-Access” in TS 36.331 [16]), or
- “reject only RRC connection establishment for delay tolerant access” (i.e., only reject traffic corresponding to
RRC cause “delayTolerantAccess” in TS 36.331 [16]).

answer Oct 11, 2015 by Veer Pal Singh Yadav
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