8.29 Reset Resource

25.4133GPPRelease 17TSUTRAN Iu interface Radio Access Network Application Part (RANAP) signalling

8.29.1 General

The purpose of the Reset Resource procedure is to initialise part of the UTRAN in the event of an abnormal failure in the CN or vice versa (e.g. Signalling Transport processor reset). The procedure uses connectionless signalling.

8.29.1.1 Reset Resource procedure initiated from the RNC

Void

8.29.1.2 Reset Resource procedure initiated from the CN

Void.

8.29.2 Successful Operation

8.29.2.1 Reset Resource procedure initiated from the RNC

Figure 34: RNC initiated Reset Resource procedure. Successful operation.

The RNC initiates the procedure by sending a RESET RESOURCE message to the CN.

The RESET RESOURCE message shall include the CN Domain Indicator IE, the Global RNC-ID IE, the Cause IE with the appropriate cause value (e.g. "Signalling Transport Resource Failure") and a list containing Iu Signalling Connection Identifier IEs.

On reception of this message the CN shall release locally the resources and references (i.e. resources and Iu signalling connection identifiers) associated to the Iu signalling connection identifiers indicated in the received message. The CN shall always return the RESET RESOURCE ACKNOWLEDGE message to the RNC when all Iu-related resources and references have been released and shall include the CN Domain Indicator IE and a list of Iu Signalling Connection Identifier IEs. The list of Iu Signalling Connection Identifier IEs within the RESET RESOURCE ACKNOWLEDGE message shall be in the same order as received in the RESET RESOURCE message. Unknown signalling connection identifiers shall be reported as released.

When a RESET RESOURCE ACKNOWLEDGE message is sent from a CN node towards an RNC for which the sending CN node is not the default CN node, the Global CN-ID IE shall be included.

Both the CN and the RNC shall provide means to prevent the immediate re-assignment of released Iu signalling connection identifiers to minimise the risk that the Reset Resource procedure releases the same Iu signalling connection identifiers re-assigned to new Iu connections.

8.29.2.2 Reset Resource procedure initiated from the CN

Figure 35: CN initiated Reset Resource procedure. Successful operation.

The CN initiates the procedure by sending a RESET RESOURCE message to the RNC.

The RESET RESOURCE message shall include the CN Domain Indicator IE, the Cause IE with the appropriate cause value (e.g. "Signalling Transport Resource Failure") and a list containing Iu Signalling Connection Identifier IEs.

When a RESET RESOURCE message is sent from a CN node towards an RNC for which the sending CN node is not the default CN node, the Global CN-ID IE shall be included.

On reception of this message the RNC shall release locally the resources and references (i.e. radio resources and Iu signalling connection identifiers) associated to the specific CN node and Iu signalling connection identifiers indicated in the received message. The Global RNC-ID IE shall not be included in the RESET RESOURCE message. If no Global CN-ID IE is included in the RESET RESOURCE message to indicate the sending CN node, the default CN node for the indicated CN domain shall be considered as sender. The RNC shall always return the RESET RESOURCE ACKNOWLEDGE message to the CN when all Iu-related resources and references have been released and shall include the CN Domain Indicator IE, a list of Iu Signalling Connection Identifier IEs and the Global RNC-ID IE. The list of Iu Signalling Connection Identifier IEs within the RESET RESOURCE ACKNOWLEDGE message shall be in the same order as received in the RESET RESOURCE message. Unknown signalling connection identifiers shall be reported as released.

Both the RNC and the CN shall provide means to prevent the immediate re-assignment of released Iu signalling connection identifiers to minimise the risk that the Reset Resource procedure releases the same Iu signalling connection identifiers re-assigned to new Iu connections.