8.35 Uplink Information Exchange

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

8.35.1 General

The purpose of the Uplink Information Exchange procedure is to transfer or request some information to the CN.

This procedure uses connectionless signalling.

8.35.2 Successful Operation

Figure 44: Uplink Information Exchange procedure. Successful operation.

The procedure is initiated with an UPLINK INFORMATION EXCHANGE REQUEST message sent from the RNC to the CN.

The UPLINK INFORMATION EXCHANGE REQUEST message shall contain the following IEs:

– Information Exchange ID

– Information Exchange Type

– CN Domain Indicator

– Global RNC-ID

The Information Exchange Type IE indicates whether the RNC asks the CN to either transfer or request specific information. If the Information Exchange Type IE is set to the value "transfer", the RNC shall also include in the UPLINK INFORMATION EXCHANGE REQUEST message the Information Transfer Type IE which indicates the nature of the information transferred.

If the Information Exchange Type IE is set to the value "request", the RNC shall also include in the UPLINK INFORMATION EXCHANGE REQUEST message the Information Request Type IE which indicates the nature of the information requested.

When the transferred information in the Information Transfer Type IE relates to a Trace Session in the RNC, the Trace Activation Indicator IE indicates whether the Trace Session identified by the Trace Reference IE is activated or deactivated in the RNC. In case the Trace Session is activated, the Equipments To Be Traced IE gives the Equipment Identity of the UEs that the RNC has to trace. If the Trace Recording Session Reference IE, Trace Collection Entity IP Address IE, the IMSI IE and optionally the Serving Cell Identifier IE are included in the message, the CN shall take the information into account for anonymization of MDT data (TS 32.422 [10]).

When the requested information in the Information Request Type IE relates to the Multicast Service list for a given UE identified by its Permanent NAS UE Identity in the Information Request Type IE, this requested information, i.e. the list of Multicast Services the UE has joined, shall be included in the Information Requested IE in the UPLINK INFORMATION EXCHANGE RESPONSE message.

When the requested information in the Information Request Type IE relates to the IP Multicast Address and APN for one or several MBMS bearer service identified by their respective TMGIs in the Information Request Type IE, this requested information, i.e. IP Multicast Address and APN, shall be included in the Information Requested IE in the UPLINK INFORMATION EXCHANGE RESPONSE message.

If the CN node is capable of processing the request or the transfer, the RNC shall be informed by the UPLINK INFORMATION EXCHANGE RESPONSE message. The UPLINK INFORMATION EXCHANGE RESPONSE message shall contain the Information Exchange ID IE and the CN Domain Indicator IE. If the RNC has not sent the UPLINK INFORMATION EXCHANGE REQUEST message to the default CN node, the UPLINK INFORMATION EXCHANGE RESPONSE message shall also include the Global CN-ID IE.

Upon reception of the UPLINK INFORMATION EXCHANGE RESPONSE message including the IP Multicast Address and APN list in the Information Requested IE, the RNC shall store this information in the relevant MBMS Service Contexts.

Upon reception of the UPLINK INFORMATION EXCHANGE RESPONSE message including the Multicast Service list in the Information Requested IE, the RNC shall perform, for each TMGI received, the corresponding UE linking as described in TS 25.346 [42].

8.35.3 Unsuccessful Operation

Figure 45: Uplink Information Exchange procedure. Unsuccessful operation.

If the CN node is not capable of correctly processing the request or the transfer, the RNC shall be informed by the UPLINK INFORMATION EXCHANGE FAILURE message. The UPLINK INFORMATION EXCHANGE FAILURE message shall contain the Information Exchange ID IE and the CN Domain Indicator IE. If the RNC has not sent the UPLINK INFORMATION EXCHANGE REQUEST message to the default CN node, the UPLINK INFORMATION EXCHANGE FAILURE message shall include the Global CN-ID IE.

The UPLINK INFORMATION EXCHANGE FAILURE message shall inform the RNC about the reason for unsuccessful operation with an appropriate cause value e.g. "MBMS – No Multicast Service For This UE", "MBMS – Unknown UE ID".

8.35.4 Abnormal Conditions

Not Applicable.