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2.15.3 RANAP FAILURE ANALYSIS2.15.3.1 RANAP Reset ResourceIf this message is received by one of the RANAP entities the following 3GPP 25.413resources and references (i.e. resources and Iu signalling connection identifiers) associatedto the Iu signalling connection identifiers indicated in the received message will be releasedlocally. The message is acknowledged by the peer entity by sending an RANAP ResetResource Acknowledge message. A distribution of counters per possible cause value is asuseful for root cause analysis as drill-down capability to the influenced/changed network

elements and single connections.2.15.3.2 RANAP ResetThis message is used to release affected RABs and to erase all affected references for thespecific core network element or RNC node that has sent the RESET message. A distributionof counters per possible cause value is as useful for root cause analysis as drill-down capabilityto the influenced/changed network elements and single connections.2.15.3.3 RANAP OverloadCongestions on signalling connections can be reported by sending an RANAP Overloadmessage. The sender can be a core network node or RNC. It is expected that the receivingentity starts activating signalling traffic reduction mechanisms to overcome the situation.

How such mechanisms work and how far they have been implemented in network nodes isbeyond the scope of this book.