11.2.50 EC Packet Control Acknowledgement

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 EC-PACCH from the mobile station to the network. The message is formatted either as an RLC/MAC control block using the EC-PACCH block format defined in 3GPP TS 44.004 or as a number of identical access bursts, according to the assigned uplink CC (see 3GPP TS 45.002), using the EC-PACCH short acknowledgement block format defined in 3GPP TS 44.004. If the message is sent as response to an EC Packet Polling Request message this latter message shall specify the format of the EC Packet Control Acknowledgement message. The order of bit transmission is defined in 3GPP TS 44.004. The numbering, assembling and field mapping conventions defined for RLC/MAC control blocks in sub-clause 10.0b shall apply.

The RLC/MAC control block format is shown in table 11.2.50.1 and table 11.2.50.2.

The access burst format is 11-bits and is coded as shown in table 11.2.50.1. The mobile station shall transmit the access burst four times, one time in each TDMA frame of the uplink radio block. The transmission of the four access bursts shall then be repeated in each of the uplink EC-PACCH resources assigned with the RRBP field according to the assigned uplink Coverage Class for the mobile station.

Message type: EC PACKET CONTROL ACKNOWLEDGEMENT

Direction: mobile station to network

Table 11.2.50.1: EC PACKET CONTROL ACKNOWLEDGEMENT information elements

< EC Packet Control Acknowledgement message content > ::= — RLC/MAC control block format

< TLLI : bit (32) >

< CTRL_ACK : bit (2) >

< DL_CC_EST : bit (4) >

< padding bits >;

< EC Packet Control Acknowledgement 11 bit message > ::= — 11-bit access burst format

< MESSAGE_TYPE : bit (7) == 1110 111 >

< DL_CC_EST : bit (4) > ;

Table 11.2.50.2: EC PACKET CONTROL ACKNOWLEDGEMENT information element details

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

CTRL_ACK (2 bit field)
This field contains acknowledgement information for the group of RLC/MAC control blocks that make up an RLC/MAC control message. The mobile station shall set the CTRL_ACK field to indicate which segments of an RLC/MAC control message have been received by the time of transmission of the EC PACKET CONTROL ACKNOWLEDGEMENT message. The CTRL_ACK field shall be set according to the following table:

bit

2 1

0 0 Reserved.

0 1 the MS received an RLC/MAC control block addressed to itself and with RBSN = 1, and did not receive an RLC/MAC control block with RBSN = 0 for the same RLC/MAC control message.

1 0 the MS received an RLC/MAC control block addressed to itself and with RBSN = 0, and did not receive an RLC/MAC control block with RBSN = 1 for the same RLC/MAC control message. This value is sent irrespective of the value of the FS bit.

1 1 the MS received two RLC/MAC blocks that contain different segments of the same RLC/MAC control message, one with RBSN = 0 and the other with RBSN = 1.

DL_CC_EST (4 bit field)
This field contains the latest downlink Coverage Class estimation and the latest estimated C value range in case the C value is above BT_Threshold_DL, see 3GPP TS 45.008. The BT_Threshold_DL value is broadcast in EC SI 2, see 3GPP TS 44.018. The DL_CC_EST field shall be set according to the following table:

bit

4 3 2 1

0 0 0 0 DL CC4

0 0 0 1 DL CC3

0 0 1 0 DL CC2

0 0 1 1 DL CC1; BT_Threshold_DL ≤ C Value < BT_Threshold_DL+3 dB
0 1 0 0 DL CC1; BT_Threshold_DL+3 dB ≤ C Value < BT_Threshold_DL+6 dB
0 1 0 1 DL CC1; BT_Threshold_DL+6 dB ≤ C Value < BT_Threshold_DL+9 dB
0 1 1 0 DL CC1; BT_Threshold_DL+9 dB ≤ C Value < BT_Threshold_DL+12 dB
0 1 1 1 DL CC1; BT_Threshold_DL+12 dB ≤ C Value < BT_Threshold_DL+15 dB
1 0 0 0 DL CC1; BT_Threshold_DL+15 dB ≤ C Value < BT_Threshold_DL+18 dB
1 0 0 1 DL CC1; BT_Threshold_DL+18 dB ≤ C Value < BT_Threshold_DL+21 dB
1 0 1 0 DL CC1; BT_Threshold_DL+21 dB ≤ C Value < BT_Threshold_DL+24 dB
1 0 1 1 DL CC1; BT_Threshold_DL+24 dB ≤ C Value < BT_Threshold_DL+27 dB
1 1 0 0 DL CC1; BT_Threshold_DL+27 dB ≤ C Value < BT_Threshold_DL+30 dB
1 1 0 1 DL CC1; BT_Threshold_DL+30 dB ≤ C Value < BT_Threshold_DL+33 dB
1 1 1 0 DL CC1; BT_Threshold_DL+33 dB ≤ C Value < BT_Threshold_DL+36 dB
1 1 1 1 DL CC1; BT_Threshold_DL+36 dB ≤ C Value < BT_Threshold_DL+39 dB