11.2.6f EGPRS Packet Downlink Ack/Nack Type 3

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.

This message shall only be used by the mobile station if indicated as supported by the network according to the value of the EGPRS Packet Downlink Ack/Nack Type 3 Support field in assignment messages.

Message type: EGPRS Packet Downlink Ack/Nack Type 3

Direction: mobile station to network

Table 11.2.6f.1: EGPRS Packet Downlink Ack/Nack TYPE 3 information elements

< EGPRS Packet Downlink Ack/Nack Type 3 message content > ::=

< DOWNLINK_TFI : bit (5) >

< MS OUT OF MEMORY : bit(1)>

{ 0 | 1 < EGPRS Channel Quality Report : < EGPRS Channel Quality Report Type 2 IE > >}

{ 0 | 1 < Secondary Dual Carrier Channel Report : < EGPRS Channel Quality Report Type 2 IE > >}

{

{ 0 | 1 < Extension Bits : Extension Bits IE > } — sub-clause 12.26

— Truncation of the EGPRS Ack/Nack Description is allowed

— if the available space in the message without EGPRS Ack/Nack Description IE

— does not allow for the inclusion of a valid EGPRS Ack/Nack Description IE, i.e. is less than 16 bits.

— In these conditions, the receiver shall assume that no EGPRS Ack/Nack description IE is included.

< EGPRS Ack/Nack Description : < EGPRS Ack/Nack Description IE >>

} // — Truncation allowed (specific conditions apply for the EGPRS Ack/Nack Description – see above)

{ — Rel-14 extension

{ 0 | 1 < MS Transmission Offset : bit (4) >

< MS Sync Accuracy : bit (4) > }

}

<padding bits > } ;

Table 11.2.6f.2: EGPRS Packet Downlink Ack/Nack TYPE 3 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. On DBPSCH, this field equals the radio bearer identity of the radio bearer to which this message applies.

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

EGPRS Channel Quality Report
This information element is defined in sub-clause 12.5a.1. For a mobile station with a dual carrier downlink assignment, this IE shall contain measurements corresponding to the downlink carrier which is paired with the uplink carrier on which this message is being sent.

Secondary Dual Carrier Channel Report

This information element is described in sub-clause 12.5a.1. For a mobile station with a dual carrier downlink assignment, this IE shall contain measurements corresponding to the downlink carrier which is not paired with the uplink carrier on which this message is being sent. This IE shall only be included by an MS in a Downlink Dual Carrier configuration.

EGPRS Ack/Nack Description (L bit field)
This information element is defined in sub-clause 12.3.1. The number of bits (L) available for Ack/Nack Description 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 message fits into an RLC/MAC control block. If a lower L covers the entire receive window, that L shall be used.

MS Transmission Offset (4 bit field)

If a downlink TBF is established using a downlink assignment message indicating “MS Transmission Offset” and “MS Sync Accuracy” parameters are needed then this field is included (see sub-clause 8.1.2.2). It is coded as decribed in sub-clause 10.4.33.

MS Sync Accuracy (4 bit field)

If a downlink TBF is established using a downlink assignment message indicating “MS Transmission Offset” and “MS Sync Accuracy” parameters are needed then this field is included (see sub-clause 8.1.2.2). It is coded as described in sub-clause 10.4.32.