11.2.48 EGPRS Packet Downlink Ack/Nack DLMC

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 PACCH from the mobile station to the network to indicate the status of downlink RLC data blocks received and to report the channel quality of the downlink for a DLMC configuration.

Message type: EGPRS Packet Downlink Ack/Nack DLMC

Direction: mobile station to network

Table 11.2.48.1: EGPRS Packet Downlink Ack/Nack DLMC information elements

< EGPRS Packet Downlink Ack/Nack DLMC message content > ::=

< DOWNLINK_TFI : bit (5) >

< DOWNLINK_eTFI : bit (3) >

< MS OUT OF MEMORY : bit(1)>

{ 0 | 1 < DLMC Channel Quality Report >}

{ 0 | 1 < Channel Request Description >}

{ 0 | 1 < PFI : bit(7) > }

{ 0 | 1 < EGPRS Ack/Nack Description DLMC >

{ 0 | 1 < DLMC Channel Quality Report >} }

<padding bits > ;

Table 11.2.48.2: EGPRS Packet Downlink Ack/Nack DLMC information element details

DOWNLINK_TFI (5 bit field)
This field contains the TFI of the mobile station’s downlink TBF. This field is defined in sub-clause 12.15.

DOWNLINK_eTFI (3 bit field)
This field contains the eTFI of the mobile station’s downlink TBF. A mobile station not assigned an eTFI shall set this field to ‘000’.

MS OUT OF MEMORY (1 bit field)
This field indicates that the MS has no more enough memory to perform Incremental Redundancy.

0 The MS has enough memory
1 The MS is running out of memory

DLMC Channel Quality Report
This information element is defined in sub-clause 12.66. This IE shall be used by a mobile station with a DLMC configuration and contains measurements corresponding to the set of reported UFPS/carriers (see sub-clause 9.1.8.2.1 for how the set of UFPS/carriers to report is determined).

Channel Request Description
This information element is defined in sub-clause 12.7. If a PFI field is included in this message, it relates to the TBF request contained in the Channel Request Description IE.

PFI (7 bit field)
This field contains the PFI parameter identifying a Packet Flow Context relating to the resource request specified in the Channel Request Description IE. The PFI parameter is encoded as the contents of the PFI information element as defined in 3GPP TS 44.018. This field may be included if the network supports packet flow context procedures and if a Channel Request Description IE is included in the message. If this field is included but the Channel Request Description IE is omitted, this field shall be ignored.

EGPRS Ack/Nack Description DLMC (L bit field)
This information element is defined in sub-clause 12.3.3. The number of bits (L) available for this information element depends on the inclusion of channel quality reports and channel requests. L shall be set so that the entire EGPRS Packet Downlink Ack/Nack DLMC message evenly fits into an RLC/MAC control block. If a lower L covers the entire receive window, that L shall be used.

Truncation of the EGPRS Ack/Nack Description DLMC IE is allowed if the available space in the message without this IE does not allow for the inclusion of a valid EGPRS Ack/Nack Description DLMC IE, i.e. is less than 16 bits of message space remains. In these conditions, the receiver shall assume that no EGPRS Ack/Nack Description DLMC IE is included.