Data Activity by UE preventing it to reselect 3G

[Jinzzz]

Hi
I am trying to understand the Data Activity which UE performing when on 2G which prevents it from reselecting to 3G. Because we are testing Voice Calls, the next call setup gets initiated before UE reselects to 3G. But when Fast Return to WCDMA is enabled UE reselects to 3G but when it is not and UE is dependent on Sib Type2 Quater Message, it keeps on doing Data Activity. By looking at the messages, I cannot make sense what is it actually doing? If it is some background Apps on the phone or something else. Would be grateful if someone can help

This is DL "Packet Uplink Ack/Nack" message on GSM RLC/MAC Layer


10:26:26.816 GSM RLC/MAC Message
{
Direction: DL
Message Type: Packet Uplink Ack/Nack
Message Content
{
PAGE MODE : 0 --> Normal paging
UPLINK_TFI : 31
EGPRS Channel Coding Command
{
EGPRS Modulation and Coding Scheme : 5 --> MCS-6
}
RESEGMENT : 0 --> Retransmitted RLC data blocks shall not be re-segmented
PRE_EMPTIVE_TRANSMISSION : 1 --> MS shall use pre-emptive transmission.
PRR RETRANSMISSION REQUEST : 0 --> not requested
ARAC RETRANSMISSION REQUEST : 0 --> Not requested
TBF_EST : 0 --> MS is not allowed to request the establishment of new TBF
Power Control Parameters
{
ALPHA : 6 --> a = 0.6
GAMMA_TN6 : 14 (Actual value: Gamma_CH= 28 dB)
}
EGPRS Ack/Nack Description
{
length : 15
EGPRS Ack/Nack Description struct
{
FINAL_ACK_INDICATION : 0 --> retransmission are requested and the TBF is incomplete
BEGINNING_OF_WINDOW : 1 --> the reported bitmap covers V(Q)
END_OF_WINDOW : 1 --> [V(R) - 1] modulo SNS is included in the bitmap.
STARTING_SEQUENCE_NUMBER : 45
}
}
}
Message Hex Dump:
{
00 24 3F 15 02 C0 5C 43 D8 2D
0B
}
}

Then UE sends EGPRS Packet Downlink Ack/Nack


10:26:26.816 GSM RLC/MAC Message
{
Direction: UL
Message Type: EGPRS Packet Downlink Ack/Nack
Message Content
{
DOWNLINK_TFI : 29
MS OUT OF MEMORY : 0 --> The MS has enough memory
EGPRS Channel Quality Report
{
EGPRS BEP Link Quality Measurements
{
8PSK_MEAN_BEP : 26
8PSK_CV_BEP : 6
}
C_VALUE : 47
EGPRS Timeslot Link Quality Measurements
}
EGPRS Ack/Nack Description
{
length : 15
EGPRS Ack/Nack Description struct
{
FINAL_ACK_INDICATION : 0 --> retransmission are requested and the TBF is incomplete
BEGINNING_OF_WINDOW : 1 --> the reported bitmap covers V(Q)
END_OF_WINDOW : 1 --> [V(R) - 1] modulo SNS is included in the bitmap.
STARTING_SEQUENCE_NUMBER : 90
}
}
padding bits :
}
Message Hex Dump:
{
00 23 AB AD 78 21 EC 2D 0B 2B
2B 2B 2B 2B 2B 2B 2B 2B 2B 2B
2B 2B 2B
}
}

Thanks

[linhhy]

It's not clear question. I can't understand your problem

[Jinzzz]

I am comparing our Network with the competitor Network. And I see that our UE spends more time in 2G and does not re-select to 3G quickly. And one of the reason is that after UE hangs up, it starts some data activity on 2G which prevents it from re-selecting to 3G. It sends the following messages
DL: Packet Uplink Ack/Nack
UL: EGPRS Packet Downlink Ack/Nack

I want to understand what are these MAC Layer messages? When UE is not doing this data activity it re-selects to 3G quicker.

[techfolkcmr]

I am comparing our Network with the competitor Network. And I see that our UE spends more time in 2G and does not re-select to 3G quickly. And one of the reason is that after UE hangs up, it starts some data activity on 2G which prevents it from re-selecting to 3G. It sends the following messages
DL: Packet Uplink Ack/Nack
UL: EGPRS Packet Downlink Ack/Nack

I want to understand what are these MAC Layer messages? When UE is not doing this data activity it re-selects to 3G quicker.

What is your test sequence and what tool you are using tems or nemo. Only calls in auto mode or data too. If voice calls only, have you tried switching your data connection off and try the test

[Jinzzz]

We are using TEMS kit, and its Voice Only testing. We are going to do testing again with Data Mode switched off.

[samcooldude1430]

I am also facing this problem. As long as the UE is in 2G data dedicated mode, it doesnt reselect to 3G.. Please any one can explain why CCO is not initiated??

[samcooldude1430]

I am comparing our Network with the competitor Network. And I see that our UE spends more time in 2G and does not re-select to 3G quickly. And one of the reason is that after UE hangs up, it starts some data activity on 2G which prevents it from re-selecting to 3G. It sends the following messages
DL: Packet Uplink Ack/Nack
UL: EGPRS Packet Downlink Ack/Nack

I want to understand what are these MAC Layer messages? When UE is not doing this data activity it re-selects to 3G quicker.

same issue...please let me if any solution

[linhhy]

same issue...please let me if any solution

It's more easier to analyze if we have some logfiles with real test.