11.2.39 MBMS Assignment (Non-distribution)

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

This message is sent on the PCCCH or on the PACCH from the network to (a) mobile station(s) in order to assign the radio bearer resources for an MBMS session or to notify the mobile station(s) that a radio bearer for that MBMS session is not established in the cell or to reassign the MBMS Bearer Identity for an MBMS radio bearer or to reassign radio resources for an MBMS radio bearer.

Message type: MBMS ASSIGNMENT (NON-DISTRIBUTION)

Direction: network to mobile station

Classification: non-distribution message

Table 11.2.39.1: MBMS ASSIGNMENT (NON-DISTRIBUTION) information elements

< MBMS Assignment Non-distribution message content > ::=

< PAGE_MODE : bit (2) >

{ { 0 < Global TFI : < Global TFI IE > >

| 10 < TLLI / G-RNTI : bit (32) > }

{ — Non-distribution part

{ 0 | 1 < Length Indicator of MS_ID : bit (2) >

< MS_ID : bit (val (Length Indicator of MS_ID)+1) >

< Packet Timing Advance : < Packet Timing Advance IE > >

{ 0 | 1 < ALPHA : bit (4) >

{ 0 | 1< GAMMA : bit (5) > }

}

}

{ 0 | 1 < TMGI : < TMGI struct > > }

{ 0 | 1 < MBMS Session Identity : bit (8) > }

{ 00 — Assignment reject. No point-to-multipoint channel is established for the MBMS session.

< Reject cause: bit (2) >

{ 0 | 1 < Estimated Session Duration : bit (8) > }

| 01 — A point-to-multipoint channel is established or reassigned for the MBMS session.

< MBMS bearer description : < MBMS bearer description struct > >

< Estimated Session Duration : bit (8) >

< MBMS In-band Signalling Indicator : < MBMS In-band Signalling Indicator IE > >

| 10 — The MBMS Bearer Identity is reassigned for the MBMS radio bearer.

{ 0 | 1 < MBMS Radio Bearer Starting Time : < bit (16) > }

< Length of MBMS Bearer Identity : bit (3) >

< MBMS Bearer Identity : bit (val (Length of MBMS Bearer Identity)) >

! < Message escape : { 11} bit (*) = < no string > > } — Extended for future changes

< padding bits >

! < Non-distribution part error : bit (*) = < no string > > }

! < Address information part error : bit (*) = < no string > > }

! < Distribution part error : bit (*) = < no string > >;

< MBMS bearer description struct > :: =

{ 0 | 1 < MBMS Radio Bearer Starting Time : < bit (16) > }

{ 0 | 1 < Frequency Parameters : < Frequency Parameters IE > > }

< DOWNLINK_TIMESLOT_ALLOCATION : bit (8) >

< Length of MBMS Bearer Identity : bit (3) >

< MBMS Bearer Identity : bit (val (Length of MBMS Bearer Identity)) >

{ 0 | 1 < EGPRS Window Size : < EGPRS Window Size IE >> }

{ 0 | 1 < TIMESLOT_ALLOCATION_UPLINK_FEEDBACK_CHANNEL : bit (3) > }

{ 0 | 1 < NPM Transfer Time : bit (5) > } ;

Table 11.2.39.2: MBMS ASSIGNMENT (NON-DISTRIBUTION) information element details

PAGE_MODE (2 bit field)
This field is defined in sub-clause 12.20.

Global TFI
This information element shall always contain the DOWNLINK_TFI field. The most significant bit(s) of the DOWNLINK_TFI field denote(s) the MBMS Bearer Identity of the MBMS radio bearer the message relates to. This field is defined in sub-clause 12.10.

TLLI / G-RNTI (32 bit field)
This field contains the TLLI/G-RNTI of the mobile station. This field is encoded as defined in sub-clause 12.16.

MS_ID (1-4 bit field)
This field addresses the mobile station, identified by the TLLI, receiving the MBMS radio bearer that is described in this message and identified by the MBMS Bearer Identity. If the MS_ID parameter is already assigned in the IMMEDIATE ASSIGNMENT message (specified in the 3GPP TS 44.018) the network shall omit it in this message. This field is defined in sub-clause 12.35.

Packet Timing Advance
If the Packet Timing Advance parameter is already allocated in the IMMEDIATE ASSIGNMENT message (specified in the 3GPP TS 44.018) the network shall omit it in this message. This information element is defined in sub-clause 12.12.

ALPHA (4 bit field)
If the ALPHA parameter is already allocated in the IMMEDIATE ASSIGNMENT message (specified in the 3GPP TS 44.018) the network shall omit it in this message. For encoding and description see the Global Power Control Parameters IE.

GAMMA (5 bit field)
The GAMMA field is the binary representation of the parameter GCH for MS output power control in units of 2 dB, see 3GPP TS 45.008. If the GAMMA parameter is already allocated in the IMMEDIATE ASSIGNMENT message (specified in the 3GPP TS 44.018) the network shall omit it in this message. The GAMMA field is coded according to the following table:

bit
5 4 3 2 1
0 0 0 0 0 GCH = 0 dB
0 0 0 0 1 GCH = 2 dB
: : : :
1 1 1 1 0 GCH = 60 dB
1 1 1 1 1 GCH = 62 dB

TMGI
This field contains the Temporary Mobile Group Identity of the MBMS service. This field is encoded as defined in sub-clause 12.33.

MBMS Session Identity (8 bit field)
This field contains the MBMS Session Identity of the concerned MBMS session.

Reject cause (2 bit field)
This field indicates whether the mobile station is allowed to perform further MBMS packet accesses for this MBMS session.

00 No radio bearer established – further MBMS packet accesses allowed for this MBMS session in this cell
01 No radio bearer established – no further MBMS packet accesses allowed for this MBMS session in this cell
10 No radio bearer established – no further MBMS packet accesses allowed for this MBMS session in this Routing Area
11 No radio bearer established – no further MBMS packet accesses allowed for this MBMS session in this PLMN

Estimated Session Duration (8 bit field)
This field contains an estimation of either the duration for the concerned MBMS session or, if the MBMS session is ongoing, the remaining duration for the concerned MBMS session. This information element is defined in sub-clause 12.44.

MBMS In-band Signalling Indicator
This information element contains the MBMS In-band Signalling Indicator. This information element is defined in sub-clause 12.45.

MBMS Radio Bearer Starting Time (16 bit field)
This field contains a starting time that indicates the frame number from which the data transfer on the assigned MBMS radio bearer may start. The MBMS Radio Bearer Starting Time is encoded as the value part of the type 3 information element Starting Time in 3GPP TS 44.018.

Frequency Parameters
If this information element is not present, the same frequency as for the PCCCH or, if the PCCCH is not present in the cell, for the CCCH, on which the network sends this message or the IMMEDIATE ASSIGNMENT message including the Multiple Blocks Packet Downlink Assignment construction and the Packet Channel Description IE specifying the PDCH over which this message is sent (see 3GPP TS 44.018), respectively, shall be used. This information element is defined in sub-clause 12.8.

DOWNLINK_TIMESLOT_ALLOCATION (8 bit field)
This field is defined in sub-clause 12.18.

Length of MBMS Bearer Identity (3 bit field)
This field indicates the length of the MBMS Bearer Identity. Any value from 1 to 5 inclusive is allowed. All other values are reserved.

MBMS Bearer Identity (1-5 bit field)
This field contains the Bearer identity for the MBMS session. This field is defined in sub-clause 12.34.

EGPRS Window Size
This information element is defined in sub-clause 12.5.2.

TIMESLOT_ALLOCATION_UPLINK_FEEDBACK_CHANNEL (3 bit field)
This field, if present, identifies the timeslot where the uplink feedback channel, on which the MBMS DOWNLINK ACK/NACK reports shall be sent, is located.

NPM Transfer Time (5 bit field)

This field is defined in sub-clause 12.45a.