3.4.26 GPRS Transparent Transport Procedure

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS

While in dedicated mode, upper layers in the mobile station or in the network may request the transport of GPRS information transparently over the radio interface when DTM operation is supported by both the mobile station and the network. This procedure is only applicable when

– the information from upper layers is signalling information; and

– the GTTP length of the message is below the maximum indicated by the network.

On the mobile station side signalling is any LLC PDU carried on LLC SAPI 1. In any other case, the RR procedures related to packet resource establishment while in dedicated mode apply.

The information from upper layers shall be carried inside the GTTP Information message. The GTTP Information message contains:

– the TLLI of the MS; and

– the LLC PDU.

If the mobile station supporting network sharing has received the PLMN Index (see sub-clause 3.4.4.1) in the HANDOVER COMMAND or DTM HANDOVER COMMAND message, it shall include it in the GTTP information message in the Skip Indicator (see sub-clause 10.3.1) if a foreign or random TLLI is used.

If the indicated TLLI is not assigned to the mobile station, the mobile station shall ignore the received message.

The GTTP messages are sent using "normal" priority at the data link layer.

3.4.27 RR procedures related to dedicated mode MBMS notification

3.4.27.1 General

The MBMS announcement of an mobile station is supported by procedures on the main DCCH when the mobile station is in dedicated mode. The procedures are only applicable to a mobile station supporting MBMS. The procedures are optional for the network.

The packet request procedure is initiated by the MS and it is described in sub-clause 3.4.22.1. The packet notification procedure is initiated by the network and it is described in sub-clause 3.4.22.2. The packet downlink assignment is initiated by the network and it is described in sub-clause 3.4.22.3.

3.4.27.2 MBMS announcement procedure in dedicated mode

3.4.27.2.1 General

The MBMS announcement procedure is initiated by the RR entity of the network side. It is triggered by the network being informed of a starting MBMS session or of an ongoing MBMS broadcast session with an updated MBMS service area list, see 3GPP TS 48.018.

3.4.27.2.2 MBMS announcement initiation by the network

The network initiates the MBMS announcement procedure by sending the mobile station a MBMS ANNOUNCEMENT message on the main DCCH.

The network shall not send the MBMS ANNOUNCEMENT message to a mobile station that does not support the MBMS service or to a mobile station that has not completed the Service Information Sending procedure. If a mobile station not supporting MBMS receives this message, the error handling as defined in sub-clause 8.4 applies.

3.4.27.2.3 MBMS notification response

Upon receipt of the MBMS ANNOUNCEMENT message including the identity of an MBMS service to which the MBMS capable mobile station has not joined, the RR sublayer of the mobile station shall discard the MBMS ANNOUNCEMENT message.

Upon receipt of the MBMS ANNOUNCEMENT message including the identity of an MBMS service to which the MBMS capable mobile station has joined and indicating a session that the mobile has not received, the RR sublayer of the mobile station indicates the receipt of a message, and passes the MBMS specific information contained within the MBMS ANNOUNCEMENT message, to the GMM sublayer.

If the Restriction Timer IE is included in the received MBMS ANNOUNCEMENT message, the mobile station shall set and start an instance of T3222 to the value indicated in the Restriction Timer IE, otherwise if the Estimated Session Duration is included in the received MBMS ANNOUNCEMENT message the mobile station shall set and start both an instance of T3222 and the session duration timer for this MBMS session with a value equal to the Estimated Session Duration. The mobile station shall store the MBMS specific information contained in the MBMS ANNOUNCEMENT message. If T3222 expires the mobile station shall discard the stored MBMS information associated with this instance of T3222.

If the mobile station in dedicated mode successfully completes the handover procedure, any MPRACH description or MBMS p-t-m channel description and MBMS Session Parameters List stored from a previously received MBMS ANNOUNCEMENT message shall be deleted.

If the mobile station enters packet idle mode before the expiry of T3222 or where no instance of T3222 was set and the MBMS ANNOUNCEMENT message did not include the MBMS p-t-m channel description, the mobile station shall stop T3222, if started, and shall follow the MBMS Packet Access Procedure (3GPP TS 44.060).

If the mobile station enters packet idle mode before the expiry of T3222 and the MBMS ANNOUNCEMENT message included the MBMS p-t-m channel description, the mobile station shall stop T3222 and shall start listening to downlink RLC blocks identified by the assigned TFI on the defined PDCHs either at the point in time denoted by the MBMS Radio Bearer Starting Time, if present and not already elapsed, or immediately otherwise (3GPP TS 44.060).

NOTE: If the MBMS ANNOUNCEMENT message includes the MBMS p-t-m channel description, it shall also include the MBMS Session Parameters List (and vice versa).